Введение
Функция организации беспроводной связи
A radio access network (RAN) is part of a mobile telecommunication system implementing a radio access technology (RAT). Conceptually, it resides between a device such as a mobile phone, a computer, or any remotely controlled machine and provides connection with its core network (CN). Depending on the standard, mobile phones and other wireless connected devices are varyingly known as user equipment (UE), terminal equipment, mobile station (MS), etc. RAN functionality is typically provided by a silicon chip residing in both the core network as well as the user equipment. See the following diagram:
CN
/ ⧵
/ ⧵
RAN RAN
/ ⧵ / ⧵
UE UE UE UE
Examples of RAN types are:
GRAN: GSM
GERAN: essentially the same as GRAN but specifying the inclusion of EDGE packet radio services
UTRAN: UMTS
E UTRAN: The Long Term Evolution (LTE) high speed and low latency
It is also possible for a single handset/phone to be simultaneously connected to multiple RANs. Handsets capable of this are sometimes called dual mode handsets. For instance it is common for handsets to support both GSM and UMTS (a. k. a. "3G") RATs. Such devices seamlessly transfer an ongoing call between different radio access networks without the user noticing any disruption in service.
Сеть радиодоступа (RAN) является частью мобильной телекоммуникационной системы, реализующей технологию радиодоступа (RAT). Концептуально, она располагается между устройством, таким как мобильный телефон, компьютер или любое дистанционно управляемое устройство, и обеспечивает соединение с его центральной сетью (CN). В зависимости от стандарта, мобильные телефоны и другие беспроводные устройства могут называться пользовательским оборудованием (UE), терминальным оборудованием, мобильной станцией (MS) и т.д. Функциональность RAN обычно обеспечивается кремниевым чипом, расположенным как в центральной сети, так и в пользовательском оборудовании. См. следующую схему:
A radio access network (RAN) is part of a mobile telecommunication system implementing a radio access technology (RAT). Conceptually, it resides between a device such as a mobile phone, a computer, or any remotely controlled machine and provides connection with its core network (CN). Depending on the standard, mobile phones and other wireless connected devices are varyingly known as user equipment (UE), terminal equipment, mobile station (MS), etc. RAN functionality is typically provided by a silicon chip residing in both the core network as well as the user equipment. See the following diagram:
CN
/ ⧵
/ ⧵
RAN RAN
/ ⧵ / ⧵
UE UE UE UE
Examples of RAN types are:
GRAN: GSM
GERAN: essentially the same as GRAN but specifying the inclusion of EDGE packet radio services
UTRAN: UMTS
E UTRAN: The Long Term Evolution (LTE) high speed and low latency
It is also possible for a single handset/phone to be simultaneously connected to multiple RANs. Handsets capable of this are sometimes called dual mode handsets. For instance it is common for handsets to support both GSM and UMTS (a. k. a. "3G") RATs. Such devices seamlessly transfer an ongoing call between different radio access networks without the user noticing any disruption in service.
CN
/ \
/ \
RAN RAN
/ \ / \
UE UE UE UE
A radio access network (RAN) is part of a mobile telecommunication system implementing a radio access technology (RAT). Conceptually, it resides between a device such as a mobile phone, a computer, or any remotely controlled machine and provides connection with its core network (CN). Depending on the standard, mobile phones and other wireless connected devices are varyingly known as user equipment (UE), terminal equipment, mobile station (MS), etc. RAN functionality is typically provided by a silicon chip residing in both the core network as well as the user equipment. See the following diagram:
CN
/ ⧵
/ ⧵
RAN RAN
/ ⧵ / ⧵
UE UE UE UE
Examples of RAN types are:
GRAN: GSM
GERAN: essentially the same as GRAN but specifying the inclusion of EDGE packet radio services
UTRAN: UMTS
E UTRAN: The Long Term Evolution (LTE) high speed and low latency
It is also possible for a single handset/phone to be simultaneously connected to multiple RANs. Handsets capable of this are sometimes called dual mode handsets. For instance it is common for handsets to support both GSM and UMTS (a. k. a. "3G") RATs. Such devices seamlessly transfer an ongoing call between different radio access networks without the user noticing any disruption in service.
Примеры типов RAN:
GRAN: GSM
GERAN: по сути, то же самое, что и GRAN, но с указанием поддержки пакетной радиосвязи EDGE
UTRAN: UMTS
E-UTRAN: Long Term Evolution (LTE) – высокоскоростная сеть с низкой задержкой
A radio access network (RAN) is part of a mobile telecommunication system implementing a radio access technology (RAT). Conceptually, it resides between a device such as a mobile phone, a computer, or any remotely controlled machine and provides connection with its core network (CN). Depending on the standard, mobile phones and other wireless connected devices are varyingly known as user equipment (UE), terminal equipment, mobile station (MS), etc. RAN functionality is typically provided by a silicon chip residing in both the core network as well as the user equipment. See the following diagram:
CN
/ ⧵
/ ⧵
RAN RAN
/ ⧵ / ⧵
UE UE UE UE
Examples of RAN types are:
GRAN: GSM
GERAN: essentially the same as GRAN but specifying the inclusion of EDGE packet radio services
UTRAN: UMTS
E UTRAN: The Long Term Evolution (LTE) high speed and low latency
It is also possible for a single handset/phone to be simultaneously connected to multiple RANs. Handsets capable of this are sometimes called dual mode handsets. For instance it is common for handsets to support both GSM and UMTS (a. k. a. "3G") RATs. Such devices seamlessly transfer an ongoing call between different radio access networks without the user noticing any disruption in service.
Также возможно одновременное подключение одного устройства к нескольким RAN. Устройства, способные к этому, иногда называют устройствами с поддержкой двух режимов. Например, часто устройства поддерживают как GSM, так и UMTS (также известный как "3G") RAT. Такие устройства плавно передают текущий вызов между различными сетями радиодоступа, не вызывая прерываний связи для пользователя.
A radio access network (RAN) is part of a mobile telecommunication system implementing a radio access technology (RAT). Conceptually, it resides between a device such as a mobile phone, a computer, or any remotely controlled machine and provides connection with its core network (CN). Depending on the standard, mobile phones and other wireless connected devices are varyingly known as user equipment (UE), terminal equipment, mobile station (MS), etc. RAN functionality is typically provided by a silicon chip residing in both the core network as well as the user equipment. See the following diagram:
CN
/ ⧵
/ ⧵
RAN RAN
/ ⧵ / ⧵
UE UE UE UE
Examples of RAN types are:
GRAN: GSM
GERAN: essentially the same as GRAN but specifying the inclusion of EDGE packet radio services
UTRAN: UMTS
E UTRAN: The Long Term Evolution (LTE) high speed and low latency
It is also possible for a single handset/phone to be simultaneously connected to multiple RANs. Handsets capable of this are sometimes called dual mode handsets. For instance it is common for handsets to support both GSM and UMTS (a. k. a. "3G") RATs. Such devices seamlessly transfer an ongoing call between different radio access networks without the user noticing any disruption in service.
RAN в Соединенных Штатах
Согласно исследовательской компании New Street, мобильные операторы T-Mobile US и AT&T используют шведскую компанию Ericsson в качестве основного поставщика RAN, а Verizon – преимущественно южнокорейскую компанию Samsung. Nokia является поставщиком для всех крупных операторов беспроводной связи в США, занимая второстепенную позицию. По данным EJL Wireless Research, Verizon также использует Ericsson.