169-534: T-Mobile US, Inc. is an American wireless network operator headquartered in Bellevue, Washington . Its largest shareholder is Deutsche Telekom , a company that operates telecommunications networks in several other countries. T-Mobile is the second largest wireless carrier in the United States , with 127.5 million subscribers as of September 30, 2024. The company was founded in 1994 by John W. Stanton of
338-641: A base station ). These base stations provide the cell with the network coverage which can be used for transmission of voice, data, and other types of content. A cell typically uses a different set of frequencies from neighboring cells, to avoid interference and provide guaranteed service quality within each cell. When joined together, these cells provide radio coverage over a wide geographic area. This enables numerous portable transceivers (e.g., mobile phones , tablets and laptops equipped with mobile broadband modems , pagers , etc.) to communicate with each other and with fixed transceivers and telephones anywhere in
507-489: A charter for a new colony to the Virginia Company of London . The group financed an expedition under Christopher Newport that established a settlement named Jamestown in 1607. Though more settlers soon joined, many were ill-prepared for the dangers of the new settlement. As the colony's president, John Smith secured food for the colonists from nearby tribes, but after he left in 1609, this trade stopped and
676-663: A group of Spanish Jesuits , explored the Chesapeake Bay during the 16th century. To help counter Spain's colonies in the Caribbean , Queen Elizabeth I of England supported Walter Raleigh 's 1584 expedition to the Atlantic coast of North America . The name "Virginia" was used by Captain Arthur Barlowe in the expedition's report, and may have been suggested by Raleigh or Elizabeth (perhaps noting her status as
845-487: A pseudonoise code (PN code) that is specific to each phone. As the user moves from one cell to another, the handset sets up radio links with multiple cell sites (or sectors of the same site) simultaneously. This is known as "soft handoff" because, unlike with traditional cellular technology , there is no one defined point where the phone switches to the new cell. In IS-95 inter-frequency handovers and older analog systems such as NMT it will typically be impossible to test
1014-593: A racially segregated society , and in 1902 rewrote the state constitution to include a poll tax and other voter registration measures that effectively disenfranchised most African Americans and many poor whites. New economic forces meanwhile industrialized the Commonwealth. Virginian James Albert Bonsack invented the tobacco cigarette rolling machine in 1880 leading to new large-scale production centered around Richmond. Railroad magnate Collis Potter Huntington founded Newport News Shipbuilding in 1886, which
1183-425: A raid on Harpers Ferry, Virginia , in an attempt to start a slave revolt across the southern states. The polarized national response to his raid, capture, trial, and execution that December marked a tipping point for many who believed slavery would need to be ended by force. Abraham Lincoln 's 1860 election further convinced many southern supporters of slavery that his opposition to its expansion would ultimately mean
1352-402: A series of ambush-style killings between colonists and natives under Chief Powhatan and his brother began, resulting in mass starvation in the colony that winter. By the end of the colony's first fourteen years, over eighty percent of the roughly eight thousand settlers transported there had died. Demand for exported tobacco , however, fueled the need for more workers. Starting in 1618,
1521-711: A $ 3.5 Billion contract for equipment to build out a nationwide 5G network that will be compliant with 3GPP 5G standards. The network will use the 600 MHz and 28 GHz frequency bands. This marked $ 7 billion invested in T-Mobile's 5G network, which will use both companies equipment. On February 26, 2018, T-Mobile announced it would roll out 5G to 30 cities by the end of 2018, with compatible handsets delivering early 2019. They also stated their 5G network will be able to work simultaneously with their 4G LTE network, delivering faster speeds and broader range. On June 28, 2019, T-Mobile officially launched their 5G mmWave network with
1690-722: A bloody Confederate victory. Union General George B. McClellan organized the Army of the Potomac , which landed on the Virginia Peninsula in March 1862 and reached the outskirts of Richmond that June. With Confederate General Joseph E. Johnston wounded in fighting outside the city, command of his Army of Northern Virginia fell to Robert E. Lee . Over the next month, Lee drove the Union army back , and starting that September led
1859-401: A cellular network, compared with a network with a single transmitter, comes from the mobile communication switching system developed by Amos Joel of Bell Labs that permitted multiple callers in a given area to use the same frequency by switching calls to the nearest available cellular tower having that frequency available. This strategy is viable because a given radio frequency can be reused in
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#17327798114542028-439: A century, at a magnitude of 5.8, struck central Virginia on August 23, 2011 . 35 million years ago, a bolide impacted what is now eastern Virginia. The resulting Chesapeake Bay impact crater may explain what earthquakes and subsidence the region does experience. A meteor impact is also theorized as the source of Lake Drummond , the largest of the two natural lakes in the state . The Commonwealth's carbonate rock
2197-426: A different area for an unrelated transmission. In contrast, a single transmitter can only handle one transmission for a given frequency. Inevitably, there is some level of interference from the signal from the other cells which use the same frequency. Consequently, there must be at least one cell gap between cells which reuse the same frequency in a standard frequency-division multiple access (FDMA) system. Consider
2366-513: A frequency reuse of 1. Since such systems do not spread the signal across the frequency band, inter-cell radio resource management is important to coordinate resource allocation between different cell sites and to limit the inter-cell interference. There are various means of inter-cell interference coordination (ICIC) already defined in the standard. Coordinated scheduling, multi-site MIMO or multi-site beamforming are other examples for inter-cell radio resource management that might be standardized in
2535-539: A governor who ignored the assembly and sent him back to England against his will. William Berkeley was named governor in 1642, just as the turmoil of the English Civil War and Interregnum permitted the colony greater autonomy. As a supporter of the king, Berkeley welcomed other Cavaliers who fled to Virginia. He surrendered to Parliamentarians in 1652, but after the 1660 Restoration made him governor again, he blocked assembly elections and exacerbated
2704-399: A large number of active phones in that area. All of the cell sites are connected to telephone exchanges (or switches), which in turn connect to the public telephone network . In cities, each cell site may have a range of up to approximately 1 ⁄ 2 mile (0.80 km), while in rural areas, the range could be as much as 5 miles (8.0 km). It is possible that in clear open areas,
2873-468: A limited, shared resource. Cell-sites and handsets change frequency under computer control and use low power transmitters so that the usually limited number of radio frequencies can be simultaneously used by many callers with less interference. A cellular network is used by the mobile phone operator to achieve both coverage and capacity for their subscribers. Large geographic areas are split into smaller cells to avoid line-of-sight signal loss and to support
3042-529: A live 5G NR network using 3 separate frequency bands; 600 MHz, 28 GHz, and 39 GHz. This was also the first live network test with successful uplink and downlink. On July 11, 2019, T-Mobile and Ericsson completed their first n71 (600 MHz) data session in their lab in Bellevue, Washington on a commercial 5G modem, the Snapdragon X55, which is the first commercial 5G modem to feature
3211-618: A major urban business and shopping center in Tysons , Virginia's largest office market. Neighboring Prince William County , with over 450,000 residents, is Virginia's second-most populous county and home to Marine Corps Base Quantico , the FBI Academy , and Manassas National Battlefield Park . Arlington County is the smallest self-governing county in the U.S. by land area, and local politicians have proposed reorganizing it as an independent city due to its high density. Loudoun County
3380-473: A majority stake in Mint Mobile would stay on as Mint's official spokesman. The deal was expected to close later that year, and the final price would be based on Ka’ena's performance. On May 28, 2024, T-Mobile US announced it would acquire the wireless operations of UScellular . Valued at $ 4.4 billion, the deal includes UScellular's customer base of 4 million users, approximately 30% of spectrum assets, and
3549-650: A minimum of three channels, and three towers for each cell and greatly increases the chances of receiving a usable signal from at least one direction. The numbers in the illustration are channel numbers, which repeat every 3 cells. Large cells can be subdivided into smaller cells for high volume areas. Cell phone companies also use this directional signal to improve reception along highways and inside buildings like stadiums and arenas. Practically every cellular system has some kind of broadcast mechanism. This can be used directly for distributing information to multiple mobiles. Commonly, for example in mobile telephony systems,
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#17327798114543718-402: A mobile phone network manages handover). The most common example of a cellular network is a mobile phone (cell phone) network. A mobile phone is a portable telephone which receives or makes calls through a cell site (base station) or transmitting tower. Radio waves are used to transfer signals to and from the cell phone. Modern mobile phone networks use cells because radio frequencies are
3887-437: A national park, but is protected by both state and federal legislation and the inter-state Chesapeake Bay Program . Virginia is divided into 95 counties and 38 independent cities , which the U.S. Census Bureau describes as county-equivalents . This general method of treating cities and counties on par with each other is unique to Virginia and stretches back to the influence of Williamsburg and Norfolk in
4056-616: A new company called VoiceStream Wireless Corporation in May 1999. In 2000, VoiceStream Wireless acquired two regional GSM carriers. Omnipoint Corporation , a regional network operator in the Northeastern United States , was acquired on February 25, 2000. Aerial Communications Inc.; a regional network operator in the Columbus, Houston, Kansas City, Minneapolis-St. Paul, Pittsburgh, and Tampa-St. Petersburg-Orlando markets;
4225-579: A new plan to upgrade its entire 2G/EDGE network to 4G LTE. They expected 50% to be done by the end of 2014, and it to be "substantially complete" by the middle of 2015. On December 16, 2014, T-Mobile announced during CEO John Legere 's Un-carrier 8.0 interview that their 4G LTE network covered 260 million people and their 700 MHz Band 12 LTE had been rolled out in Cleveland , Colorado Springs , Minneapolis , and Washington, D.C. They expected to cover 280 million with LTE by mid-2015 and 300 million by
4394-412: A number of frequency channels corresponding to a bandwidth of B/K , and each sector can use a bandwidth of B/NK . Code-division multiple access -based systems use a wider frequency band to achieve the same rate of transmission as FDMA, but this is compensated for by the ability to use a frequency reuse factor of 1, for example using a reuse pattern of 1/1. In other words, adjacent base station sites use
4563-400: A plan add-on allowing phone trade-ins for early upgrades twice per year, carrying over unused data allotments for up to a year, and zero-rating of selected music and video services (the latter locked to "DVD quality") over the mobile network, These moves came as part of an effort under new CEO John Legere to help revitalize the business as it improves its network quality. Though this system
4732-579: A referendum and went into effect in 1971. In 1989, Douglas Wilder became the first African American elected as governor in the United States, and in 1992, Bobby Scott became the first Black congressman from Virginia since 1888. The expansion of federal government offices into Northern Virginia's suburbs during the Cold War boosted the region's population and economy. The Central Intelligence Agency outgrew their offices in Foggy Bottom during
4901-456: A specific date for the complete shutdown of the GSM network remains undetermined, the retirement process has commenced. This includes the potential decommissioning of select 2G sites as early as February 9, 2024. In September 2006, T-Mobile made a significant strategic investment in its network infrastructure by participating in a Federal Communications Commission (FCC) auction, securing licenses in
5070-943: A strategy called " massive resistance ", and the General Assembly passed a package of laws in 1956 that cut off funding to local schools that desegregated , causing some to close. Courts ruled the strategy unconstitutional, and on February 2, 1959, Black students integrated schools in Arlington and Norfolk , where they were known as the Norfolk 17 . County leaders in Prince Edward, however, instead shut their school system in June 1959. The Supreme Court ordered them to reopen and integrate their public schools , which finally happened in September 1964. Federal passage of
5239-619: A strong effect on eastern and southeastern coastal areas, making the climate there warmer but also more constant. Most of Virginia's recorded extremes in temperature and precipitation have occurred in the Blue Ridge Mountains and areas west. Virginia receives an average of 43.47 inches (110 cm) of precipitation annually, with the Shenandoah Valley being the state's driest region. Virginia has around 35–45 days with thunderstorms annually, and storms are common in
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5408-399: A taxicab company, as well as for local wireless communications in enterprise and industrial settings such as factories, warehouses, mines, power plants, substations, oil and gas facilities and ports. In a cellular radio system, a land area to be supplied with radio service is divided into cells in a pattern dependent on terrain and reception characteristics. These cell patterns roughly take
5577-530: A time when invited by the base station operator. This is a form of time-division multiple access (TDMA). The history of cellular phone technology began on December 11, 1947 with an internal memo written by Douglas H. Ring , a Bell Labs engineer in which he proposed development of a cellular telephone system by AT&T. The first commercial cellular network, the 1G generation, was launched in Japan by Nippon Telegraph and Telephone (NTT) in 1979, initially in
5746-416: A user may receive signals from a cell site 25 miles (40 km) away. In rural areas with low-band coverage and tall towers, basic voice and messaging service may reach 50 miles (80 km), with limitations on bandwidth and number of simultaneous calls. Since almost all mobile phones use cellular technology , including GSM , CDMA , and AMPS (analog), the term "cell phone" is in some regions, notably
5915-728: Is also the site of the region's main seaport and Naval Station Norfolk , the world's largest naval base. Virginia's history begins with several Indigenous groups , including the Powhatan . In 1607, the London Company established the Colony of Virginia as the first permanent English colony in the New World , leading to Virginia's nickname as the Old Dominion . Slaves from Africa and land from displaced native tribes fueled
6084-500: Is based on spread spectrum technology developed for military use during World War II and improved during the Cold War into direct-sequence spread spectrum that was used for early CDMA cellular systems and Wi-Fi . DSSS allows multiple simultaneous phone conversations to take place on a single wideband RF channel, without needing to channelize them in time or frequency. Although more sophisticated than older multiple access schemes (and unfamiliar to legacy telephone companies because it
6253-672: Is called the Shenandoah Valley in Virginia, named after the river of the same name that flows through it. The Cumberland Plateau and Cumberland Mountains are in the southwest corner of Virginia, south of the Allegheny Plateau . In this region, rivers flow northwest into the Ohio River basin. The Virginia Seismic Zone has not had a history of regular earthquake activity. Earthquakes are rarely above 4.5 in magnitude . The Commonwealth's largest earthquake in at least
6422-424: Is called the handover or handoff. Typically, a new channel is automatically selected for the mobile unit on the new base station which will serve it. The mobile unit then automatically switches from the current channel to the new channel and communication continues. The exact details of the mobile system's move from one base station to the other vary considerably from system to system (see the example below for how
6591-480: Is filled with more than 4,000 limestone caves , ten of which are open for tourism, including the popular Luray Caverns and Skyline Caverns . Virginia's iconic Natural Bridge is the remaining roof of a collapsed limestone cave. Coal mining takes place in the three mountainous regions. More than 72 million tons of other non-fuel resources, such as slate , kyanite , sand, or gravel, were mined in Virginia in 2020 . The largest known deposits of uranium in
6760-478: Is no problem with two cells sufficiently far apart operating on the same frequency, provided the masts and cellular network users' equipment do not transmit with too much power. The elements that determine frequency reuse are the reuse distance and the reuse factor. The reuse distance, D is calculated as where R is the cell radius and N is the number of cells per cluster. Cells may vary in radius from 1 to 30 kilometres (0.62 to 18.64 mi). The boundaries of
6929-514: Is said to improve network quality, issues surrounding net neutrality infringement have also come to light. The type of zero-rating that is offered by T-Mobile allows it to charge higher rates to third-parties, meaning that ISP can prioritize the company that pays a higher premium. This makes it more difficult for smaller third-parties who are unable to pay the high premium charged by the ISP. On June 28, 2013, T-Mobile agreed to buy wireless spectrum for
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7098-545: Is the fastest-growing county in the state. In western Virginia, Roanoke city and Montgomery County , part of the Blacksburg–Christiansburg metropolitan area , both have surpassed a population of 100,000 since 2018. On the western edge of the Tidewater region is Virginia's capital, Richmond , which has a population of around 230,000 in its city proper and over 1.3 million in its metropolitan area. On
7267-647: The Back Bay National Wildlife Refuge , which marks the beginning of the Outer Banks . State agencies control about one-third of protected land in the state, and the Virginia Department of Conservation and Recreation manages over 75,900 acres (307.2 km ) in forty Virginia state parks and 59,222 acres (239.7 km ) in 65 Natural Area Preserves , plus three undeveloped parks. Breaks Interstate Park crosses
7436-699: The Civil Rights Act (1964) and Voting Rights Act (1965), and their later enforcement by the Justice Department , helped end racial segregation in Virginia and overturn Jim Crow laws . In 1967, the Supreme Court struck down the state's ban on interracial marriage with Loving v. Virginia . In 1968, Governor Mills Godwin called a commission to rewrite the state constitution. The new constitution, which banned discrimination and removed articles that now violated federal law, passed in
7605-560: The Committee of Nine . During the post-war Reconstruction era , African Americans were able to unite in communities, particularly around Richmond , Danville , and the Tidewater region , and take a greater role in Virginia society; many achieved some land ownership during the 1870s. Virginia adopted a constitution in 1868 which guaranteed political, civil, and voting rights , and provided for free public schools. However, with many railroad lines and other infrastructure destroyed during
7774-862: The Korean War , and moved to Langley in 1961, in part due to a decision by the National Security Council that the agency relocate outside the District of Columbia. The Pentagon , built in Arlington during World War II as the headquarters of the Department of Defense, was struck by a hijacked plane in the September 11, 2001 attacks . Mass shootings at Virginia Tech in 2007 and in Virginia Beach in 2019 led to passage of gun control measures in 2020. Racial injustice and
7943-707: The Southwest Mountains around Charlottesville . The Blue Ridge Mountains are a physiographic province of the Appalachian Mountains with the highest points in the Commonwealth, the tallest being Mount Rogers at 5,729 feet (1,746 m). The Ridge-and-Valley region is west of the mountains, carbonate rock based, and includes the Massanutten Mountain ridge and the Great Appalachian Valley , which
8112-723: The Torpedo Factory in Alexandria had over 5,050. High-school student Barbara Rose Johns started a strike in 1951 at her underfunded and segregated school in Prince Edward County . The protests led Spottswood Robinson and Oliver Hill to file a lawsuit against the county . Their case joined Brown v. Board of Education at the Supreme Court, which rejected the doctrine of " separate but equal " in 1954. The segregationist establishment, led by Senator Harry F. Byrd and his Byrd Organization , reacted with
8281-944: The Tutelo , who spoke Siouan , to the west. In response to threats from these other groups to their trade network, thirty or so Virginia Algonquian -speaking tribes consolidated during the 1570s under Wahunsenacawh, known in English as Chief Powhatan . Powhatan controlled more than 150 settlements that had a total population of around 15,000 in 1607. Three-fourths of the native population in Virginia, however, died from smallpox and other Old World diseases during that century, disrupting their oral traditions and complicating research into earlier periods. Additionally, many primary sources, including those that mention Powhatan's daughter, Pocahontas , were created by Europeans, who may have held biases or misunderstood native social structures and customs. Several European expeditions, including
8450-632: The U.S. Virgin Islands . Following the Suncom acquisition, T-Mobile possessed native network presence in all the major metro areas in the United States. On March 20, 2011, AT&T announced its intention to purchase T-Mobile US from Deutsche Telekom. The Antitrust Division of the United States Department of Justice responded by filing a federal lawsuit on August 31, 2011, to block the merger. AT&T then decided to formally abandon
8619-632: The UMTS system where it allows for low downlink latency in packet-based connections. In LTE/4G, the Paging procedure is initiated by the MME when data packets need to be delivered to the UE. Paging types supported by the MME are: In a primitive taxi system, when the taxi moved away from a first tower and closer to a second tower, the taxi driver manually switched from one frequency to another as needed. If communication
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#17327798114548788-665: The United States between the Atlantic Coast and the Appalachian Mountains . The state's capital is Richmond and its most populous city is Virginia Beach . Its most populous subdivision is Fairfax County , part of Northern Virginia , where slightly over a third of Virginia's population of 8.7 million live. Eastern Virginia is part of the Atlantic Plain , and the Middle Peninsula forms
8957-607: The Virginia big-eared bat , the state mammal . The Virginia opossum is the only marsupial native to the United States and Canada, and the native Appalachian cottontail was recognized in 1992 as a distinct species of rabbit, one of three found in the state. Whales, dolphins, and porpoises have been recorded in Virginia's coastal waters, with bottlenose dolphins being the most frequent aquatic mammals . Virginia's bird fauna comprises 422 counted species, of which 359 are regularly occurring and 214 have bred in Virginia, while
9126-551: The Western Wireless Corporation as VoiceStream Wireless . Deutsche Telekom then gained plurality ownership in 2001 and renamed it after its global T-Mobile brand . As of April 2023, the European company holds a 51.4% stake in the company. T-Mobile US operates two main brands: T-Mobile and Metro by T-Mobile (acquired in a 2013 reverse takeover of MetroPCS that also led to T-Mobile's listing on
9295-555: The breeding of slaves , often through rape, a profitable business. Slaves in the Richmond area were also forced into industrial jobs, including mining and shipbuilding. The failed slave uprisings of Gabriel Prosser in 1800, George Boxley in 1815, and Nat Turner in 1831, however, marked the growing resistance to slavery. Afraid of further uprisings, Virginia's government in the 1830s encouraged free Blacks to migrate to Liberia . On October 16, 1859, abolitionist John Brown led
9464-431: The class divide by disenfranchising and restricting the movement of indentured servants, who made up around eighty percent of the workforce. On the colony's frontier, tribes like the Tutelo and Doeg were being squeezed by Seneca raiders from the north, leading to more confrontations with colonists. In 1676, several hundred working-class followers of Nathaniel Bacon , upset by Berkeley's refusal to retaliate against
9633-606: The headright system tried to solve this by granting colonists farmland for their help attracting indentured servants . Enslaved Africans were first sold in Virginia in 1619. Though other Africans arrived as indentured servants and could be freed after four to seven years, the basis for lifelong slavery was developed in legal cases like those of John Punch in 1640 and John Casor in 1655. Laws passed in Jamestown defined slavery as race-based in 1661, as inherited maternally in 1662, and as enforceable by death in 1669. From
9802-766: The siege of Yorktown . His surrender on October 19, 1781, led to peace negotiations in Paris and secured the independence of the colonies. Virginians were instrumental in writing the United States Constitution : James Madison drafted the Virginia Plan in 1787 and the Bill of Rights in 1789. Virginia ratified the Constitution on June 25, 1788. The three-fifths compromise ensured that Virginia, with its large number of slaves, initially had
9971-550: The state fish . Downhill in the Piedmont, stripeback darter and Roanoke bass become common, as do swampfish , bluespotted sunfish , and pirate perch in the Tidewater . The Chesapeake Bay hosts clams, oysters, and 350 species of saltwater and estuarine fish , including the bay's most abundant finfish, the Bay anchovy , as well as the invasive blue catfish . An estimated 317 million Chesapeake blue crabs live in
10140-549: The "Virgin Queen" or that they viewed the land as being untouched) or related to an Algonquin phrase, Wingandacoa or Windgancon , or leader's name, Wingina , as heard by the expedition. The name initially applied to the entire coastal region from South Carolina in the south to Maine in the north, along with the island of Bermuda . Raleigh's colony failed, but the potential financial and strategic gains still captivated many English policymakers. In 1606, King James I issued
10309-514: The 1700 MHz and 2100 MHz Advanced Wireless Services (AWS) bands for US$ 4.18 billion (equivalent to $ 6.32 billion in 2023). This spectrum acquisition provided the foundation for the nationwide deployment of a 3G network utilizing the UMTS standard. The initial rollout targeted major markets and offered projected speeds of 7.2 Mbit/s, exceeding competitor offerings at the time. This ambitious initiative required an additional investment of $ 2.6 billion (equivalent to $ 3.9 billion in 2023) beyond
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#173277981145410478-441: The 1930s to over one million by the 2010s. Native carnivorans include black bears , who have a population of around five to six thousand in the state, as well as bobcats , coyotes , both gray and red foxes , raccoons , weasels and skunks . Rodents include groundhogs , nutria , beavers , both gray squirrels and fox squirrels , chipmunks, and Allegheny woodrats , while the seventeen bat species include brown bats and
10647-485: The 1994 establishment of VoiceStream Wireless PCS as a subsidiary of Western Wireless Corporation . After its spin off from parent Western Wireless on May 3, 1999, VoiceStream Wireless was purchased by Deutsche Telekom AG in 2001 for $ 35 billion and renamed T-Mobile USA, Inc., in July 2002. In 2013, T-Mobile and MetroPCS finalized a merger of the two companies which started trading as T-Mobile U.S. VoiceStream Wireless PCS
10816-416: The 2022–2023 winter season. Climate change in Virginia is leading to higher temperatures year-round as well as more heavy rain and flooding events. Urban heat islands can be found in many Virginia cities and suburbs, particularly in neighborhoods linked to historic redlining . The air in Virginia has statistically improved since 1998. The closure and conversion of coal power plants in Virginia and
10985-483: The 600 MHz frequency compliant with 3GPP 5G standards in Spokane, Washington. 28 GHz only reaches roughly 1 square mile (2.6 km), whereas 600 MHz can reach hundreds of square miles. This marks one step closer to a rural 5G network, one highly sought improvement with 5G technology (high-speed data in rural areas). On January 7, 2019, T-Mobile and Ericsson completed the first audio and video call using
11154-411: The 600 MHz network reaches 8,900 cities and towns, covering 248 million people. On June 25, 2018, T-Mobile and Nokia completed their first bi-directional 5G NR transmission in the 28 GHz frequency compliant with 3GPP 5G standards , showing a big step forward to building a nationwide 5G Network. On November 20, 2018, T-Mobile and Nokia completed their first downlink 5G NR transmission in
11323-554: The Appalachian Mountains can lead to significant snowfalls across the state, such as the January 2016 blizzard , which created the state's highest recorded one-day snowfall of 36.6 inches (93 cm) near Bluemont . On average, cities in Virginia can receive between 5.8–12.3 inches (15–31 cm) of snow annually, but recent winters have seen below-average snowfalls, and much of Virginia had no measurable snow during
11492-594: The Bell System , with cellular assets transferred to the Regional Bell Operating Companies . The wireless revolution began in the early 1990s, leading to the transition from analog to digital networks . The MOSFET invented at Bell Labs between 1955 and 1960, was adapted for cellular networks by the early 1990s, with the wide adoption of power MOSFET , LDMOS ( RF amplifier ), and RF CMOS ( RF circuit ) devices leading to
11661-842: The Black population was reduced by the Great Migration to northern industrial cities in the first half of the 20th century, since 1965 there has been a reverse migration of Blacks returning south . The Commonwealth has the highest number of Black-white interracial marriages in the US , and 8.2% of Virginians describe themselves as multiracial . More recent immigration since the late 20th century has resulted in new communities of Hispanics and Asians. As of 2020 , 10.5% of Virginia's total population describe themselves as Hispanic or Latino , and 8.8% as Asian . The state's Hispanic population rose by 92% from 2000 to 2010, with two-thirds of Hispanics in
11830-399: The Census Bureau recognizes several hundred unincorporated communities . Over three million people, 35% of Virginians, live in the twenty jurisdictions collectively defined as Northern Virginia , part of the larger Washington metropolitan area and the Northeast megalopolis . Fairfax County , with more than 1.1 million residents, is Virginia's most populous jurisdiction, and has
11999-469: The Civil War, the Commonwealth was deeply in debt, and in the late 1870s redirected money from public schools to pay bondholders. The Readjuster Party formed in 1877 and won legislative power in 1879 by uniting Black and white Virginians behind a shared opposition to debt payments and the perceived plantation elites . The Readjusters focused on building up schools, like Virginia Tech and Virginia State , and successfully forced West Virginia to share in
12168-527: The Dakotas, Eastern West Virginia, and Northern Michigan. On May 25, 2016, T-Mobile announced that it will be purchasing the 700Mhz A-block license (LTE band 12) for the Chicago metro area. When this transaction closes, together with several other pending 700Mhz license acquisitions, T-Mobile expects to possess 700Mhz licenses covering a total of 272 million people, or 84% of the US population – including 10 of
12337-620: The FCC approved a deal between T-Mobile and Verizon in which T-Mobile gained additional AWS spectrum licenses in 125 Cellular Market Areas. On February 25, 2014, T-Mobile announced in its Q4 2013 earnings call that its 4G LTE network covered 209 million people in 273 metro areas. They also planned to start rolling out their 700 MHz A-Block spectrum by the end of 2014, which by the end of the rollout would cover 158 million people. This spectrum led to improved LTE coverage overall in these areas, particularly indoors. On March 13, 2014, T-Mobile announced
12506-756: The Great Dismal and Nottoway swamps. Other common trees include red spruce, Atlantic white cedar , tulip-poplar , and the flowering dogwood , the state tree and flower . Plants like milkweed , dandelions, daisies, ferns, and Virginia creeper , which is featured on the state flag , are also common. The Thompson Wildlife Area in Fauquier is known for having one of the largest populations of trillium wildflowers in North America. White-tailed deer , one of 75 mammal species found in Virginia, rebounded from an estimated population of as few as 25,000 in
12675-791: The Iroquois, and other allied tribes on both sides. A militia from several British colonies, called the Virginia Regiment , was led by Major George Washington , himself one of the investors in the Ohio Company. In the decade following the French and Indian War , the British Parliament passed new taxes which were deeply unpopular in the colonies, and in the House of Burgesses ; opposition to taxation without representation
12844-460: The Kentucky border and is one of only two inter-state parks in the United States. Sustainable logging is allowed in 26 state forests managed by the Virginia Department of Forestry totaling 71,972 acres (291.3 km ), as is hunting in 44 Wildlife Management Areas run by the Virginia Department of Wildlife Resources covering over 205,000 acres (829.6 km ). The Chesapeake Bay is not
13013-632: The May 23 referendum, armed pro-Confederate groups prevented the casting and counting of votes from areas that opposed secession. Representatives from 27 of these northwestern counties instead began the Wheeling Convention , which organized a government loyal to the Union and led to the separation of West Virginia as a new state. The armies of the Union and Confederacy first met on July 21, 1861, in Battle of Bull Run near Manassas, Virginia ,
13182-609: The Mississippi Valley region from its competitor U.S. Cellular for around $ 308 million, allowing it to expand its 4G network across 29 more markets. On January 6, 2014, T-Mobile signed agreements with Verizon Wireless to purchase some 700 MHz A-Block spectrum licenses for $ 2.365 billion. Moreover, a transfer of some AWS and PCS spectrum licenses with a value of $ 950 million has been agreed upon by T-Mobile and Verizon. The acquisition reportedly gave T-Mobile additional coverage for approximately 158 million people in 9 of
13351-510: The NASDAQ). In 2020, T-Mobile expanded through the acquisition of Sprint , which also made T-Mobile the operator of Assurance Wireless , a service subsidized by the federal Lifeline program . The company's growth continued in 2024 with the acquisitions of Mint Mobile and Ultra Mobile , which remain separate brands. Additionally, T-Mobile serves as the host network for various mobile virtual network operators . T-Mobile U.S. traces its roots to
13520-555: The Ohio Valley region has helped cut the amount of particulate matter in Virginia's air in half. Current plans call for 30% of the Commonwealth's electricity to be renewable by 2030 and for all to be carbon-free by 2050. Forests cover 62% of Virginia as of 2021 , of which 80% is considered hardwood forest, meaning that trees are primarily deciduous and broad-leaved . The other 20% is pine, with loblolly and shortleaf pine dominating much of central and eastern Virginia. In
13689-572: The PCS band. To achieve compatibility with other networks and phones in the US, T-Mobile began this transition in March 2013, and the rollout of LTE is currently underway as T-Mobile expands to more markets. Due to the failed acquisition of T-Mobile USA by AT&T, T-Mobile USA received additional UMTS frequency band 4 (AWS) spectrum. On March 26, 2013, T-Mobile began rolling out LTE in 7 markets: Baltimore , San Jose , Washington, D.C. , Phoenix , Las Vegas , Kansas City , and Houston . On August 21, 2012,
13858-457: The Sprint brand was officially discontinued on August 2, 2020. Leadership, background and stock changes happened immediately, with customer-side changes happening over time. Billing was already showing the T-Mobile brand, and all retail, customer service, and all other company branding switched to the T-Mobile brand. T-Mobile and Sprint accounts were still managed by employees in separate systems and
14027-655: The U.S. Census Bureau found that only 0.5% of Virginians were exclusively American Indian or Alaska Native , though 2.1% were in some combination with other ethnicities. The state government has extended recognition to eleven tribes. Seven tribes also have federal recognition. The Pamunkey and Mattaponi have reservations on tributaries of the York River in the Tidewater region . [REDACTED] American Community Survey five-year estimate According to U.S. Census data as of 2022 on Virginia residents aged five and older, 83% (6,805,548) speak English at home as
14196-623: The U.S. are under Coles Hill, Virginia . Despite a challenge that reached the U.S. Supreme Court twice , the state has banned its mining since 1982 due to environmental and public health concerns. Virginia has a humid subtropical climate that transitions to humid continental west of the Blue Ridge Mountains . Seasonal extremes vary from average lows of 25 °F (−4 °C) in January to average highs of 86 °F (30 °C) in July. The Atlantic Ocean and Gulf Stream have
14365-554: The US, covering 100% geographically of the US. They started the rollout of LTE on this band on August 15, 2017. In 2018 T-Mobile has stated they will not discontinue rollout and upgrades of LTE in favor of 5G. Instead, they will continue to grow and support their LTE network to work simultaneously with 5G. As of January 22, 2019, the LTE-Advanced upgrade has been deployed in 6,000 cities and towns. As of October 28, 2019, LTE now covers 326 million people. As of February 6, 2020,
14534-709: The US, used interchangeably with "mobile phone". However, satellite phones are mobile phones that do not communicate directly with a ground-based cellular tower but may do so indirectly by way of a satellite. There are a number of different digital cellular technologies, including: Global System for Mobile Communications (GSM), General Packet Radio Service (GPRS), cdmaOne , CDMA2000 , Evolution-Data Optimized (EV-DO), Enhanced Data Rates for GSM Evolution (EDGE), Universal Mobile Telecommunications System (UMTS), Digital Enhanced Cordless Telecommunications (DECT), Digital AMPS (IS-136/TDMA), and Integrated Digital Enhanced Network (iDEN). The transition from existing analog to
14703-478: The United States as of 2020 . El Salvador is the most common foreign country of birth, with India , Mexico , South Korea , the Philippines , and Vietnam as other common birthplaces. The state's most populous racial group, non-Hispanic whites , has declined as a proportion of the population from 76% in 1990 to 58.6% in 2020. Immigrants from Britain and Ireland settled throughout the Commonwealth during
14872-489: The United States. Virginia has a total area of 42,774.2 square miles (110,784.7 km ), including 3,180.13 square miles (8,236.5 km ) of water, making it the 35th- largest state by area. It is bordered by Maryland and Washington, D.C. to the northeast; by the Atlantic Ocean to the east; by North Carolina to the south; by Tennessee to the southwest; by Kentucky to the west; and by West Virginia to
15041-530: The Virginia General Assembly proposed a new surveying commission in 1871. Representatives from Tennessee preferred to keep the less-straight 1803 line, and in 1893, the U.S. Supreme Court ruled for them against Virginia . One result is how the city of Bristol is divided in two between the states. The Chesapeake Bay separates the contiguous portion of the Commonwealth from the two-county peninsula of Virginia's Eastern Shore . The bay
15210-640: The area held by the Seneca and their larger Iroquois Nation , and in 1748, a group of wealthy speculators, backed by the British monarchy, formed the Ohio Company to start English settlement and trade in the Ohio Country west of the Appalachian Mountains . France, which claimed this area as part of New France , viewed this as a threat, and in 1754 the French and Indian War engulfed England, France,
15379-714: The army and revolutionary militias. Virginia was the first colony to ratify the Articles of Confederation in December 1777. In April 1780, the capital was moved to Richmond at the urging of Governor Thomas Jefferson, who feared that Williamsburg's coastal location would make it vulnerable to British attack. British forces landed around Portsmouth in October 1780, and soldiers under Benedict Arnold raided Richmond in January 1781. The British army had over seven thousand soldiers and twenty-five warships stationed in Virginia at
15548-471: The basis of 3G ). With FDMA, the transmitting and receiving frequencies used by different users in each cell are different from each other. Each cellular call was assigned a pair of frequencies (one for base to mobile, the other for mobile to base) to provide full-duplex operation. The original AMPS systems had 666 channel pairs, 333 each for the CLEC "A" system and ILEC "B" system. The number of channels
15717-547: The bay as of 2024 . There are 34 native species of crayfish, like the Big Sandy . Amphibians found in Virginia include the Cumberland Plateau salamander and Eastern hellbender , while the northern watersnake is the most common of the 32 snake species. As of 2019 , roughly 16.2% of land in the Commonwealth is protected by federal, state, and local governments and non-profits. Federal lands account for
15886-566: The beginning of 1781, but General Charles Cornwallis and his superiors were indecisive, and maneuvers by the three thousand soldiers under the Marquis de Lafayette and twenty-nine allied French warships together managed to confine the British to a swampy area of the Virginia Peninsula in September. Around sixteen thousand soldiers under George Washington and Comte de Rochambeau quickly converged there and defeated Cornwallis in
16055-405: The case of a taxi company, where each radio has a manually operated channel selector knob to tune to different frequencies. As drivers move around, they change from channel to channel. The drivers are aware of which frequency approximately covers some area. When they do not receive a signal from the transmitter, they try other channels until finding one that works. The taxi drivers only speak one at
16224-493: The cells can also overlap between adjacent cells and large cells can be divided into smaller cells. The frequency reuse factor is the rate at which the same frequency can be used in the network. It is 1/K (or K according to some books) where K is the number of cells which cannot use the same frequencies for transmission. Common values for the frequency reuse factor are 1/3, 1/4, 1/7, 1/9 and 1/12 (or 3, 4, 7, 9 and 12, depending on notation). In case of N sector antennas on
16393-418: The centers of the cells and were omnidirectional, a cellular map can be redrawn with the cellular telephone towers located at the corners of the hexagons where three cells converge. Each tower has three sets of directional antennas aimed in three different directions with 120 degrees for each cell (totaling 360 degrees) and receiving/transmitting into three different cells at different frequencies. This provides
16562-528: The colonial period, when roughly three-fourths of immigrants came as indentured servants . The Appalachian mountains and Shenandoah Valley have many settlements that were populated by German and Scotch-Irish immigrants in the 18th and 19th centuries, often following the Great Wagon Road . Over ten percent of Virginians have German ancestry as of 2020 . The largest minority group in Virginia are Blacks and African Americans, about one-fifth of
16731-585: The colonial period. Only three other independent cities exist elsewhere in the US. The differences between counties and cities in Virginia are small and have to do with how each assess new taxes, whether a referendum is necessary to issue bonds, and with the application of Dillon's Rule , which limits the authority of cities and counties to countermand acts expressly allowed by the General Assembly . Counties can also have incorporated towns , and while there are no further administrative subdivisions ,
16900-506: The colony's start, residents agitated for greater local control, and in 1619, certain male colonists began electing representatives to an assembly, later called the House of Burgesses , that negotiated issues with the governing council appointed by the London Company. Unhappy with this arrangement, the monarchy revoked the company's charter and began directly naming governors and Council members in 1624. In 1635, colonists arrested
17069-501: The company announced the acquisition of regional GSM carrier SunCom Wireless Holdings, Inc. for $ 2.4 billion; the acquisition closed on February 22, 2008. By September 8, 2008, SunCom's operations were integrated with those of the company. The acquisition added SunCom's 1.1 million customers to the company's customer base and expanded the company's network coverage to include southern Virginia , North Carolina , South Carolina , eastern Tennessee , northeastern Georgia , Puerto Rico and
17238-497: The company still offered Sprint branded SIM cards . New rate plans were also introduced as well for all new and existing customers from both companies, though all were grandfathered into their current plan should they choose not to switch to a new T-Mobile plan for at least three years. As part of the Sprint merger, T-Mobile US acquired Assurance Wireless , the service subsidized by the Lifeline Assistance program of
17407-517: The concentration of independent cities in the Tidewater region is that several rural counties there re-incorporated as cities or consolidated with existing cities to try to hold on to their new suburban neighborhoods that started booming in the 1950s , since cities like Norfolk and Portsmouth were able to annex land from adjoining counties until a moratorium in 1987. Others, like Poquoson , became cities to try to preserve racial segregation during
17576-617: The deployment of 4G LTE services, T-Mobile initiated a process of migrating 3G services to its PCS band. This strategic shift ultimately rendered some 3G devices incompatible with the network. T-Mobile decommissioned its UMTS network in July 2022. On February 23, 2012, during the Q4 Earnings Call, T-Mobile laid out the future of their 4G upgrade path. They would roll out the LTE network on the AWS spectrum, and transition their HSPA+ network to
17745-409: The desegregation era of the 1970s. The 2020 census found the state resident population was 8,631,393, a 7.9% increase since the 2010 census . Another 23,149 Virginians live overseas, giving the state a total population of 8,654,542. Virginia has the fourth-largest overseas population of U.S. states due to its federal employees and military personnel. The fertility rate in Virginia as of 2020
17914-507: The desired service including mobility management, registration, call set-up, and handover . Any phone connects to the network via an RBS ( Radio Base Station ) at a corner of the corresponding cell which in turn connects to the Mobile switching center (MSC). The MSC provides a connection to the public switched telephone network (PSTN). The link from a phone to the RBS is called an uplink while
18083-615: The development and proliferation of digital wireless mobile networks. The first commercial digital cellular network, the 2G generation, was launched in 1991. This sparked competition in the sector as the new operators challenged the incumbent 1G analog network operators. To distinguish signals from several different transmitters, a number of channel access method s have been developed, including frequency-division multiple access (FDMA, used by analog and D-AMPS systems), time-division multiple access (TDMA, used by GSM ) and code-division multiple access (CDMA, first used for PCS , and
18252-599: The digital standard followed a very different path in Europe and the US . As a consequence, multiple digital standards surfaced in the US, while Europe and many countries converged towards the GSM standard. A simple view of the cellular mobile-radio network consists of the following: This network is the foundation of the GSM system network. There are many functions that are performed by this network in order to make sure customers get
18421-541: The eastern edge is the Hampton Roads metropolitan area, where over 1.7 million reside across six counties and nine cities, including the Commonwealth's three most populous independent cities: Virginia Beach , Chesapeake , and Norfolk . Neighboring Suffolk , which includes a portion of the Great Dismal Swamp , is the largest city by area at 429.1 square miles (1,111 km ). One reason for
18590-587: The end of 2001, VoiceStream Wireless had 19,000 employees serving 7 million subscribers. On September 2, 2001, VoiceStream Wireless Inc. adopted the name, T-Mobile USA, Inc. and began rolling out the T-Mobile brand, starting with locations in California and Nevada. T-Mobile USA, Inc. was an operating entity of T-Mobile International AG , before becoming a direct subsidiary of Deutsche Telekom AG. The merger became official in July 2002. On September 17, 2007,
18759-588: The end of 2015. They also stated that they covered 121 metro areas with their Wideband LTE. On October 27, 2015, T-Mobile announced in its Q3 2015 earnings call that they covered over 300 million people with LTE, reaching their 2015 end of year goal months ahead of schedule. They had 245 markets with Wideband (at least 15+15 MHz) LTE. They also had 204 markets with Extended Range 700 MHz Band 12 LTE covering around 175 million people. Their coverage map revealed that they now had new native LTE coverage in Montana,
18928-500: The end of slavery across the country. The seizure of Fort Sumter by Confederate forces on April 14, 1861, prompted Lincoln to call for a federal army of 75,000 men from state militias . The Virginia Secession Convention of 1861 voted on April 17 to secede on the condition it was approved in a referendum the next month. The convention voted to join the Confederacy, which named Richmond its capital on May 20. During
19097-471: The end of the 18-month lock-up period . In March 2013, T-Mobile introduced a major overhaul of its plan structure, marketed by branding themselves as being "the Un-carrier". A new contract-free pricing structure with simpler plans was introduced in which a phone's cost is paid over a two-year financing plan. The "Un-carrier" strategy has since been expanded to encompass other value-added services, such as
19266-411: The federal Universal Service Fund . In March 2023, T-Mobile US agreed to acquire Ka’ena Corporation as well as subsidiaries and brands: Mint Mobile , a successful budget direct-to-consumer prepaid wireless brand in the US, and Ultra Mobile , a wireless service that offers international calling options to communities across the country, for up to $ 1.35 billion. It was noted that Ryan Reynolds who owns
19435-403: The first of several invasions into Union territory. During the next three years of war, more battles were fought in Virginia than anywhere else, including the battles of Fredericksburg , Chancellorsville , Spotsylvania , and the concluding Battle of Appomattox Court House , where Lee surrendered on April 9, 1865. Virginia was formally restored to the United States in 1870, due to the work of
19604-445: The form of regular shapes, such as hexagons, squares, or circles although hexagonal cells are conventional. Each of these cells is assigned with multiple frequencies ( f 1 – f 6 ) which have corresponding radio base stations . The group of frequencies can be reused in other cells, provided that the same frequencies are not reused in adjacent cells, which would cause co-channel interference . The increased capacity in
19773-551: The future. Cell towers frequently use a directional signal to improve reception in higher-traffic areas. In the United States , the Federal Communications Commission (FCC) limits omnidirectional cell tower signals to 100 watts of power. If the tower has directional antennas, the FCC allows the cell operator to emit up to 500 watts of effective radiated power (ERP). Although the original cell towers created an even, omnidirectional signal, were at
19942-730: The growing plantation economy, but also fueled conflicts both inside and outside the colony. Virginians fought for the independence of the Thirteen Colonies in the American Revolution , and helped establish the new national government. During the American Civil War , the state government in Richmond joined the Confederacy , while many northwestern counties remained loyal to the Union , which led to
20111-578: The land on Virginia's islands, which include Tangier Island in the bay and Chincoteague , one of 23 barrier islands on the Atlantic coast. The Tidewater is a coastal plain between the Atlantic coast and the fall line . It includes the Eastern Shore and major estuaries of Chesapeake Bay. The Piedmont is a series of sedimentary and igneous rock -based foothills east of the mountains. The region, known for its heavy clay soil, includes
20280-466: The largest bloc in the House of Representatives . Together with the Virginia dynasty of presidents, this gave the Commonwealth national importance. Virginia is called the "Mother of States" because of its role in being carved into states such as Kentucky , and for the numbers of American pioneers born in Virginia. Between 1790 and 1860, the number of slaves in Virginia rose from around 290 thousand to over 490 thousand, roughly one-third of
20449-440: The late afternoon and evenings between April and September. These months are also the most common for tornadoes , eight of which touched down in the Commonwealth in 2023. Hurricanes and tropical storms can occur from August to October. The deadliest natural disaster in Virginia was Hurricane Camille , which killed over 150 people in 1969 mainly in inland Nelson County . Between December and March, cold-air damming caused by
20618-537: The launch of their first commercially available 5G NR device, the Galaxy S10 5G. The network has launched in 6 cities; Los Angeles , NYC , Atlanta , Dallas , Las Vegas , and Cleveland . Cellular network A cellular network or mobile network is a telecommunications network where the link to and from end nodes is wireless and the network is distributed over land areas called cells , each served by at least one fixed-location transceiver (such as
20787-873: The majority, with thirty National Park Service units, such as Great Falls Park and the Appalachian Trail , and one national park, Shenandoah . Almost forty percent of Shenandoah's total 199,173 acres (806 km ) area has been designated as wilderness under the National Wilderness Preservation System . The U.S. Forest Service administers the George Washington and Jefferson National Forests , which cover more than 1.6 million acres (6,500 km ) within Virginia's mountains, and continue into West Virginia and Kentucky . The Great Dismal Swamp National Wildlife Refuge also extends into North Carolina, as does
20956-530: The merger bid on December 19, 2011. On October 3, 2012, MetroPCS Communications reached an agreement to merge with T-Mobile USA. MetroPCS shareholders would hold a 26% stake in the company formed after the merger, which retained the T-Mobile brand. While the new company was still the fourth-largest carrier in the United States (at the time), the acquisition gave T-Mobile access to more spectrum and financial resources to maintain competitiveness and expand its LTE network. The merger between T-Mobile USA Inc. and MetroPCS
21125-507: The metropolitan area of Tokyo . Within five years, the NTT network had been expanded to cover the whole population of Japan and became the first nationwide 1G network. It was an analog wireless network . The Bell System had developed cellular technology since 1947, and had cellular networks in operation in Chicago and Dallas prior to 1979, but commercial service was delayed by the breakup of
21294-620: The middle of the 20th century, are the focus of conservation efforts in the state and a reintroduction program in Shenandoah National Park . Virginia has 226 species of freshwater fish from 25 families, a diversity attributable to the area's varied and humid climate, topography, interconnected river system, and lack of Pleistocene glaciers . Common examples on the Cumberland Plateau and higher-elevation regions include Eastern blacknose dace , sculpin , smallmouth bass , redhorse sucker , Kanawha darter , and brook trout ,
21463-410: The most important use of broadcast information is to set up channels for one-to-one communication between the mobile transceiver and the base station. This is called paging . The three different paging procedures generally adopted are sequential, parallel and selective paging. The details of the process of paging vary somewhat from network to network, but normally we know a limited number of cells where
21632-546: The mouth of the Chesapeake Bay . Central Virginia lies predominantly in the Piedmont , the foothill region of the Blue Ridge Mountains , which cross the western and southwestern parts of the state. The fertile Shenandoah Valley fosters the state's most productive agricultural counties, while the economy in Northern Virginia is driven by technology companies and U.S. federal government agencies. Hampton Roads
21801-409: The n71 band. However, the modem was pre-market and not in any commercially available device. On July 30, 2018, T-Mobile and Nokia announced a $ 3.5 billion contract for equipment and software to build out a nationwide 5G network that will be compliant with 3GPP 5G standards. The network will use the 600 MHz and 28 GHz frequency bands. On September 11, 2018, T-Mobile and Ericsson announced
21970-489: The network steadily expanded its geographic reach and technological capabilities. Data transmission was later added the network by implementing General Packet Radio Service (GPRS). This was later augmented with the Enhanced Data Rates for GSM Evolution (EDGE) technology, significantly accelerating data transmission speeds. EDGE coverage was available within at least forty percent of the GSM footprint. While
22139-605: The network, via base stations, even if some of the transceivers are moving through more than one cell during transmission. Cellular networks offer a number of desirable features: Major telecommunications providers have deployed voice and data cellular networks over most of the inhabited land area of Earth . This allows mobile phones and mobile computing devices to be connected to the public switched telephone network and public Internet access . Private cellular networks can be used for research or for large organizations and fleets, such as dispatch for local public safety agencies or
22308-474: The north and drifted an additional 3.5 miles by the border's westernmost point . After Tennessee joined the U.S. in 1796, new surveyors worked in 1802 and 1803 to reset their border with Virginia as a line from the summit of White Top Mountain to the top of Tri-State Peak in the Cumberland Mountains . However, deviations in that border were identified when it was re-marked in 1856, and
22477-466: The northwest. That Virginia's boundary with Maryland and Washington, D.C. only extends to the low-water mark of the south shore of the Potomac River has been an issue for water rights over the years. . Virginia's southern border was defined in 1665 as 36°30' north latitude . Surveyors marking the border with North Carolina in the 18th century however started about 3.5 miles (5.6 km) to
22646-536: The number of subscribers per cell site, greater data throughput per user, or some combination thereof. Quadrature Amplitude Modulation (QAM) modems offer an increasing number of bits per symbol, allowing more users per megahertz of bandwidth (and decibels of SNR), greater data throughput per user, or some combination thereof. The key characteristic of a cellular network is the ability to reuse frequencies to increase both coverage and capacity. As described above, adjacent cells must use different frequencies, however, there
22815-431: The other way is termed downlink . Radio channels effectively use the transmission medium through the use of the following multiplexing and access schemes: frequency-division multiple access (FDMA), time-division multiple access (TDMA), code-division multiple access (CDMA), and space-division multiple access (SDMA). Small cells, which have a smaller coverage area than base stations, are categorised as follows: As
22984-460: The phone is located (this group of cells is called a Location Area in the GSM or UMTS system, or Routing Area if a data packet session is involved; in LTE , cells are grouped into Tracking Areas). Paging takes place by sending the broadcast message to all of those cells. Paging messages can be used for information transfer. This happens in pagers , in CDMA systems for sending SMS messages, and in
23153-441: The phone user moves from one cell area to another cell while a call is in progress, the mobile station will search for a new channel to attach to in order not to drop the call. Once a new channel is found, the network will command the mobile unit to switch to the new channel and at the same time switch the call onto the new channel. With CDMA , multiple CDMA handsets share a specific radio channel. The signals are separated by using
23322-518: The population. Virginia was a major destination of the Atlantic slave trade . The Igbo ethnic group of what is now southern Nigeria were the largest African group among slaves in Virginia. Blacks in Virginia also have more European ancestry than those in other southern states, and DNA analysis shows many have asymmetrical male and female ancestry from before the Civil War, evidence of European fathers and African or Native American mothers. Though
23491-620: The pre-war debt. But in 1883, they were divided by a proposed repeal of anti-miscegenation laws , and days before that year's election, a riot in Danville , involving armed policemen, left four Black men and one white man dead. These events motivated a push by white supremacists to seize political power through voter suppression , and segregationists in the Democratic Party won the legislature that year and maintained control for decades. They passed Jim Crow laws that established
23660-518: The presence of Confederate monuments in Virginia have also led to large demonstrations, including in August 2017, when a white supremacist drove his car into protesters , killing one, and in June 2020, when protests that were part of the larger Black Lives Matter movement brought about the removal of Confederate statues . Virginia is located in the Mid-Atlantic and Southeastern regions of
23829-411: The range of $ 4.5 billion annually. District Judge Victor Marrero then announced his decision in favor of the merger on February 11, 2020, stating that it "is not likely to substantially lessen competition like the suing [states] had claimed it would" and that Sprint "does not have a sustainable long-term competitive strategy" to remain a viable competitor. The merger finally closed on April 1, 2020, and
23998-483: The receiving end to produce a somewhat normal-sounding voice at the receiver. TDMA must introduce latency (time delay) into the audio signal. As long as the latency time is short enough that the delayed audio is not heard as an echo, it is not problematic. TDMA is a familiar technology for telephone companies, which used time-division multiplexing to add channels to their point-to-point wireline plants before packet switching rendered FDM obsolete. The principle of CDMA
24167-469: The rest are mostly winter residents or transients . Water birds include sandpipers, wood ducks, and Virginia rail , while common inland examples include warblers, woodpeckers, and cardinals, the state bird . Birds of prey include osprey, broad-winged hawks , and barred owls . There are no endemic bird species. Audubon recognizes 21 Important Bird Areas in the state. Peregrine falcons , whose numbers dramatically declined due to DDT poisoning in
24336-490: The rights to more than 2,000 towers. T-Mobile's network provides coverage in the continental United States, Hawaii, Puerto Rico, and the U.S. Virgin Islands. VoiceStream Wireless (T-Mobile's predecessor) first started building out its cellular network in 1994. This initial 2G network utilized the GSM standard was first turned on in Honolulu and Salt Lake City by 1996. Through strategic acquisitions and spectrum purchases,
24505-415: The same base station site, each with different direction, the base station site can serve N different sectors. N is typically 3. A reuse pattern of N/K denotes a further division in frequency among N sector antennas per site. Some current and historical reuse patterns are 3/7 (North American AMPS), 6/4 (Motorola NAMPS), and 3/4 ( GSM ). If the total available bandwidth is B , each cell can only use
24674-462: The same frequencies, and the different base stations and users are separated by codes rather than frequencies. While N is shown as 1 in this example, that does not mean the CDMA cell has only one sector, but rather that the entire cell bandwidth is also available to each sector individually. Recently also orthogonal frequency-division multiple access based systems such as LTE are being deployed with
24843-706: The separation of West Virginia in 1863. Although the state was under one-party rule for nearly a century following the Reconstruction era , both major political parties have been competitive in Virginia since the repeal of Jim Crow laws in the 1970s. Virginia's state legislature is the Virginia General Assembly , which was established in July 1619, making it the oldest current law-making body in North America . Unlike other states, cities and counties in Virginia function as equals, but
25012-524: The southwest and Mexico by the end of the period. Palisaded towns began to be built around 1200. The native population in the current boundaries of Virginia reached around 50,000 in the 1500s. Large groups in the area at that time included the Algonquian in the Tidewater region , which they referred to as Tsenacommacah , the Iroquoian -speaking Nottoway and Meherrin to the north and south, and
25181-621: The spectrum acquisition cost. The initial network activation was delayed due to unforeseen circumstances related to government agencies vacating the allocated spectrum. Despite launching the first 3G phone in November 2007, the network itself wasn't operational until May 2008 in New York City. By 2009, T-Mobile had expanded its 3G network to cover over 200 markets. The company further enhanced its network capabilities by upgrading to HSPA+ in 2010. In 2015, to optimize network bandwidth for
25350-476: The state government manages most local roads. It is also the only state where governors are prohibited from serving consecutive terms. Nomadic hunters are estimated to have arrived in Virginia around 17,000 years ago. Evidence from Daugherty's Cave shows it was regularly used as a rock shelter by 9,800 years ago. During the late Woodland period (500–1000 CE ), tribes coalesced, and farming, first of corn and squash, began, with beans and tobacco arriving from
25519-686: The state living in Northern Virginia . Northern Virginia also has a significant population of Vietnamese Americans , whose major wave of immigration followed the Vietnam War . Korean Americans have migrated there more recently, while about 45,000 Filipino Americans have settled in the Hampton Roads area. Tribal membership in Virginia is complicated by the legacy of the state's " pencil genocide " of intentionally categorizing Native Americans and Blacks together, and many tribal members do have African or European ancestry, or both. In 2020,
25688-587: The state population, and the number of slave owners rose to over 50 thousand. Both of these numbers represented the most in the U.S. The boom in Southern cotton production using cotton gins increased the amount of labor needed for harvesting raw cotton , but new federal laws prohibited the importation of slaves. Decades of monoculture tobacco farming had also degraded Virginia's agricultural productivity . Virginia plantations increasingly turned to exporting slaves , which broke up countless families and made
25857-545: The state than moving to it in 2021. This is largely credited to high home prices in Northern Virginia, which are driving residents there to relocate south; Raleigh is their top destination. Aside from Virginia, the top birth state for Virginians is New York , with the Northeast accounting for the largest number of domestic migrants into the state by region. About twelve percent of residents were born outside
26026-444: The target channel directly while communicating. In this case, other techniques have to be used such as pilot beacons in IS-95. This means that there is almost always a brief break in the communication while searching for the new channel followed by the risk of an unexpected return to the old channel. Virginia Virginia , officially the Commonwealth of Virginia , is a state in the Southeastern and Mid-Atlantic regions of
26195-434: The top 10 and 21 of the top 30 U.S. markets. On April 29, 2018, T-Mobile US and Sprint Corporation announced their intention to merge. Although the U.S. Justice Department initially approved the merger on July 26, 2019, the attorneys general from several states filed a lawsuit in the U.S. District Court for the Southern District of New York to block it, alleging that the merger would result in higher prices for consumers in
26364-503: The top 10 largest US metro areas. T-Mobile refers to its 700Mhz low-band network as 'Extended-range LTE' and claims it penetrates buildings and reaches out farther than its PCS and AWS only network. In September 2016, T-Mobile launched 4x4 MIMO and 3 channel carrier aggregation allowing theoretical speeds of 400 Mbit/s, and also announced that the company's LTE network reaches over 312 million potential subscribers. In early 2017, T-Mobile purchased 45% of available 600 MHz spectrum in
26533-432: The tribes, burned Jamestown. Bacon's Rebellion forced the signing of Bacon's Laws , which restored some of the colony's rights and sanctioned both attacks on native tribes and the enslavement of their people. The Treaty of 1677 further reduced the independence of the tribes that signed it, and aided the colony's assimilation of their land in the years that followed. Colonists in the 1700s were pushing westward into
26702-483: The western and mountainous parts of the Commonwealth, oak and hickory are most common, while lower altitudes are more likely to have small but dense stands of hemlocks and mosses in abundance. Spongy moth infestations in oak trees and the blight in chestnut trees have decreased both of their numbers, leaving more room for hickory and the invasive tree of heaven . In the lowland tidewater and Piedmont , yellow pines tend to dominate, with bald cypress wetland forests in
26871-419: Was 55.8 per 1,000 females between the ages of 15 and 44, and the median age as of 2021 was the same as the national average of 38.8 years old. The geographic center of population is located northwest of Richmond in Hanover County , as of 2020 . Though still growing naturally as births outnumber deaths, Virginia has had a negative net migration rate since 2013, with 8,995 more people leaving
27040-517: Was acquired on May 4, 2000. The combined company retired the Omnipoint and Aerial brands and completed integrating the three companies by converting to a single customer billing platform, implementing standard business practices and launching the VoiceStream brand and "GET MORE" marketing strategy in all markets. On June 1, 2001, Deutsche Telekom (DT) completed its acquisition of VoiceStream Wireless, Inc., for $ 35 billion and Southern U.S. regional GSM network operator Powertel, Inc. , for $ 24 billion. By
27209-487: Was established in 1994 as a subsidiary of Western Wireless Corporation to provide wireless personal communications services (PCS) in 19 FCC-defined metropolitan service areas in several western and southwestern states using the GSM digital wireless standard. VoiceStream Wireless' digital, urban service areas complemented the analog, rural service areas marketed by Western Wireless under the Cellular One brand. Western Wireless spun off its VoiceStream Wireless division into
27378-622: Was expanded to 416 pairs per carrier, but ultimately the number of RF channels limits the number of calls that a cell site could handle. FDMA is a familiar technology to telephone companies, which used frequency-division multiplexing to add channels to their point-to-point wireline plants before time-division multiplexing rendered FDM obsolete. With TDMA, the transmitting and receiving time slots used by different users in each cell are different from each other. TDMA typically uses digital signaling to store and forward bursts of voice data that are fit into time slices for transmission, and expanded at
27547-400: Was formed from the drowned river valley of the ancient Susquehanna River . Many of Virginia's rivers flow into the Chesapeake Bay, including the Potomac , Rappahannock , York , and James , which create three peninsulas in the bay, traditionally referred to as "necks" named Northern Neck , Middle Peninsula , and the Virginia Peninsula from north to south. Sea level rise has eroded
27716-438: Was interrupted due to a loss of a signal, the taxi driver asked the base station operator to repeat the message on a different frequency. In a cellular system, as the distributed mobile transceivers move from cell to cell during an ongoing continuous communication, switching from one cell frequency to a different cell frequency is done electronically without interruption and without a base station operator or manual switching. This
27885-506: Was led by Patrick Henry and Richard Henry Lee , among others. Virginians began to coordinate their actions with other colonies in 1773 and sent delegates to the Continental Congress the following year. After the House of Burgesses was dissolved in 1774 by the royal governor , Virginia's revolutionary leaders continued to govern via the Virginia Conventions . On May 15, 1776, the Convention declared Virginia's independence and adopted George Mason 's Virginia Declaration of Rights , which
28054-471: Was not developed by Bell Labs ), CDMA has scaled well to become the basis for 3G cellular radio systems. Other available methods of multiplexing such as MIMO , a more sophisticated version of antenna diversity , combined with active beamforming provides much greater spatial multiplexing ability compared to original AMPS cells, that typically only addressed one to three unique spaces. Massive MIMO deployment allows much greater channel reuse, thus increasing
28223-411: Was officially approved by MetroPCS shareholders on April 24, 2013. The deal was structured as a reverse takeover ; the combined company went public on the New York Stock Exchange as TMUS and became T-Mobile U.S. Inc. on May 1, 2013. The merger agreement gave Deutsche Telekom the option to sell its 72% stake in the company formed by the merger and valued at around $ 14.2 billion to a third party before
28392-636: Was responsible for building 38 warships for the U.S. Navy between 1907 and 1923. During World War I , German submarines attacked ships outside the port, which was a major site for transportation of soldiers and supplies. After the war, a homecoming parade to honor African-American troops was attacked in July 1919 by the city's police as part of a renewed white-supremacy movement, known as Red Summer . The shipyard continued building warships in World War II , and quadrupled its pre-war labor force to 70,000 by 1943. The Radford Arsenal outside Blacksburg also employed 22,000 workers making explosives, while
28561-402: Was then included in a new constitution that designated Virginia as a commonwealth . Another Virginian, Thomas Jefferson , drew upon Mason's work in drafting the national Declaration of Independence . After the American Revolutionary War began, George Washington was selected by the Second Continental Congress in Philadelphia to head the Continental Army , and many Virginians joined
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