UMTS channels

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The UMTS channels are communication channels used by third generation (3G) wireless Universal Mobile Telecommunications System (UMTS) networks. [1] [2] [3] UMTS channels can be divided into three levels:

3G, short for third generation, is the third generation of wireless mobile telecommunications technology. It is the upgrade for 2G and 2.5G GPRS networks, for faster internet speed. This is based on a set of standards used for mobile devices and mobile telecommunications use services and networks that comply with the International Mobile Telecommunications-2000 (IMT-2000) specifications by the International Telecommunication Union. 3G finds application in wireless voice telephony, mobile Internet access, fixed wireless Internet access, video calls and mobile TV.

Contents

List

UMTS Channels
LevelAbrev.Full NameDescriptionUL/DLRef
3_LOGICAL BCCH broadcast control channelFor broadcasting system control informationDL5.3.1.1.1 [4]
3_LOGICAL CCCH common control channelSupports common procedures required to establish a dedicated link between the UE and the network.UL/DL5.3.1.1.1 [4]
3_LOGICAL CTCH common traffic channelA point-to-multipoint unidirectional channel for transfer of dedicated user information for all or a group of specified UEs.DL5.3.1.1.1 [4]
3_LOGICAL DCCH dedicated control channelA point-to-point dedicated channel for transmitting control information between a UE and the network.UL/DL5.3.1.1.1 [4]
3_LOGICAL DTCH dedicated traffic channelA point-to-point dedicated channel for transmitting user traffic information between a UE and the network.UL/DL5.3.1.1.1 [4]
3_LOGICAL PCCH paging control channelTransfers paging information. Used when the network does not know the location cell of the UE or the UE is in sleep mode.DL5.3.1.1.1 [4]
2_TRANSPORT BCH broadcast channelUsed to broadcast cell and system information.DL4.1.2.1 [5]
2_TRANSPORT CPCH common packet channelUsed for transmission of bursty data traffic. Shared by the UEs in a cell. Employs fast power control. NOTE - removed after R5.UL4.1.2.5 [6]
2_TRANSPORTDCHdedicated channelAllocated to an individual user and typically used to support a speech channel.UL/DL4.1.1.1 [5]
2_TRANSPORT DSCH downlink shared channelCarries dedicated user data or control information. May be shared by several UEs. Associated with a downlink DCH. NOTE - removed after R5.DL4.1.2.6 [6]
2_TRANSPORT E-DCH enhanced dedicated channelHSUPA Enhanced (high-speed) dedicated uplink transport channel.UL4.1.1.2 [5]
2_TRANSPORT FACH forward access channelCarries control information to UEs in a cell (may also be used to transmit packet data). Makes up the RACH/FACH pair.DL4.1.2.2 [5]
2_TRANSPORT HS-DSCH high speed downlink shared channelThe HSDPA transport channel. Shared by several UEs.DL4.1.2.7 [5]
2_TRANSPORT PCH paging channelCarries paging procedure data (for sleep mode) used by network to establish connection to UE. Always transmitted over entire cell.DL4.1.2.3 [5]
2_TRANSPORT RACH random access channelUsed to gain access to the system when first attaching to it (can also carry packet data). Makes up the RACH/FACH pair. Always received from entire cell. Entails a collision risk. Transmitted using open loop power control.UL4.1.2.4 [5]
1_PHYSICAL AICH acquisition indicator channelCarries acquisition indicators. AI corresponds to signature on the PRACH. Fixed rate (sf=256).DL5.3.3.7 [5]
1_PHYSICAL CD/CA-ICH collision detection/channel assignment indicator channelCarries CD Indicator (CDI) or CD Indicator/CA Indicator (CDI/CAI). Fixed rate (sf=256). NOTE - removed after R5.DL5.3.3.9 [6]
1_PHYSICAL CPICH common pilot channelProvides the default phase reference for demodulation of the other downlink channels and enables channel estimation. Uses a pre-defined bit sequence. Fixed rate (sf=256).DL5.3.3.11 [5]
1_PHYSICAL CSICH cpch status indication channelCarries CPCH status information. Fixed rate (sf=256). NOTE - removed after R5.DL5.3.3.11 [6]
1_PHYSICAL DPCCH dedicated physical control channelCarries physical layer control information including known pilot bits to support channel estimation, transmit power-control (TPC) commands, feedback information (FBI) and, optionally, transport-format combination indicator (TFCI).UL/DL5.3.3.11 [5]
1_PHYSICAL DPDCH dedicated physical data channelCarries DCH data. Used with DPCCH. May be multiple DPDCHs on each radio link.UL/DL5.3.3.11 [5]
1_PHYSICAL E-AGCH enhanced absolute grant channel[HSUPA] Establishes absolute power lever for UE transmission on E-DCH. Fixed rate (sf=256).DL5.3.3.14 [5]
1_PHYSICAL E-DPCCH enhanced dedicated physical control channel[HSUPA] Control information associated with E-DCH. Transmitted along with E-DPDCH.UL/DL5.2.1.3 [5]
1_PHYSICAL E-DPDCH enhanced dedicated physical data channel[HSUPA] Carries the E-DCH transport channel. Transmitted along with E-DPCCH.UL5.2.1.3 [5]
1_PHYSICAL E-HICH enhanced hybrid indicator channel[HSUPA] Dedicated channel which carries the E-DCH hybrid ARQ acknowledgement indicator. Fixed rate (sf=128).DL5.3.2.5 [5]
1_PHYSICAL E-RGCH enhanced relative grant channel[HSUPA] Carries the uplink E-DCH relative grants. Fixed rate (sf=128).DL5.3.2.4 [5]
1_PHYSICAL HS-DPCCH high speed dedicated physical control channel[HSDPA] Carries feedback signalling related to HS-DSCH including HARQ-ACK and CQI.UL5.2.1.2 [5]
1_PHYSICAL HS-PDSCH high speed physical downlink shared channel[HSDPA] Carries actual user data for HS-DSCH.DL5.3.3.13 [5]
1_PHYSICAL HS-SCCH high speed shared control channel[HSDPA] Contains downlink signalling information related to HS-DSCH. Fixed rate (sf=128).DL5.3.3.12 [5]
1_PHYSICAL P-CCPCH primary common control physical channelsCarries BCH (Broadcast Channel). There is one P-CCPCH within a cell used to carry synchronization and broadcast information for all users.DL5.3.3.3 [5]
1_PHYSICAL PCPCH physical common packet channelCarries CPCH (Common Packet Channel). NOTE - removed after R5.UL5.2.2.2 [6]
1_PHYSICAL PDSCH physical downlink shared channelCarries DSCH. NOTE - removed after R5.DL5.3.3.6 [6]
1_PHYSICAL PICH page indicator channelCarries PCH. Fixed rate (sf=256).DL5.3.3.10 [5]
1_PHYSICAL PRACH physical random access channelCarries RACH (Random Access Channel).UL5.2.2.1 [5]
1_PHYSICAL S-CCPCH secondary common control physical channelsCarries FACH (Forward Access Channel) and PCH (Paging Channel).DL5.3.3.4 [5]
1_PHYSICAL SCH synchronization channelUsed for cell search and conveying synchronization information. Consists of two sub-channels - Primary and Secondary SCH.DL5.3.3.5 [5]

UMTS Channels.svg

See also

The Universal Mobile Telecommunications System (UMTS) is a third generation mobile cellular system for networks based on the GSM standard. Developed and maintained by the 3GPP, UMTS is a component of the International Telecommunications Union IMT-2000 standard set and compares with the CDMA2000 standard set for networks based on the competing cdmaOne technology. UMTS uses wideband code division multiple access (W-CDMA) radio access technology to offer greater spectral efficiency and bandwidth to mobile network operators.

High Speed Packet Access Communications protocols

High Speed Packet Access (HSPA) is an amalgamation of two mobile protocols, High Speed Downlink Packet Access (HSDPA) and High Speed Uplink Packet Access (HSUPA), that extends and improves the performance of existing 3G mobile telecommunication networks using the WCDMA protocols. A further improved 3GPP standard, Evolved High Speed Packet Access, was released late in 2008 with subsequent worldwide adoption beginning in 2010. The newer standard allows bit-rates to reach as high as 337 Mbit/s in the downlink and 34 Mbit/s in the uplink. However, these speeds are rarely achieved in practice.

Related Research Articles

Medium access control a service layer in IEEE 802 network standards

In IEEE 802 LAN/MAN standards, the medium access control (MAC) sublayer and the logical link control (LLC) sublayer together make up the data link layer. Within that data link layer, the LLC provides flow control and multiplexing for the logical link, while the MAC provides flow control and multiplexing for the transmission medium.

Non-access stratum (NAS) is a functional layer in the UMTS and LTE wireless telecom protocol stacks between the core network and user equipment. This layer is used to manage the establishment of communication sessions and for maintaining continuous communications with the user equipment as it moves. The NAS is defined in contrast to the Access Stratum which is responsible for carrying information over the wireless portion of the network. A further description of NAS is that it is a protocol for messages passed between the User Equipment, also known as mobiles, and Core Nodes that is passed transparently through the radio network. Examples of NAS messages include Update or Attach messages, Authentication Messages, Service Requests and so forth. Once the User Equipment (UE) establishes a radio connection, the UE uses the radio connection to communicate with the core nodes to coordinate service. The distinction is that the Access Stratum is for dialogue explicitly between the mobile equipment and the radio network and the NAS is for dialogue between the mobile equipment and core network nodes. For LTE, the Technical Standard for NAS is 3GPP TS 24.301.

+- – - – - -+ +- – - – - – -+ | HTTP | | Application | +- – - – - -+ +- – - – - – -+ | TCP | | Transport | +- – - – - -+ +- – - – - – -+ | IP | | Internet | +- – - – - -+ +- – - – - – -+ | NAS | | Network | +- – - – - -+ +- – - – - – -+ | AS | | Link | +- – - – - -+ +- – - – - – -+ | Channels | | Physical | +- – - – - -+ +- – - – - – -+

In telecommunications networks, RANAP is a protocol specified by 3GPP in TS 25.413 and used in UMTS for signaling between the Core Network, which can be a MSC or SGSN, and the UTRAN. RANAP is carried over Iu-interface.

The Mobile Application Part (MAP) is an SS7 protocol that provides an application layer for the various nodes in GSM and UMTS mobile core networks and GPRS core networks to communicate with each other in order to provide services to users. The Mobile Application Part is the application-layer protocol used to access the Home Location Register, Visitor Location Register, Mobile Switching Center, Equipment Identity Register, Authentication Centre, Short message service center and Serving GPRS Support Node (SGSN).

Multimedia Broadcast Multicast Services (MBMS) is a point-to-multipoint interface specification for existing and upcoming 3GPP cellular networks, which is designed to provide efficient delivery of broadcast and multicast services, both within a cell as well as within the core network. For broadcast transmission across multiple cells, it defines transmission via single-frequency network configurations. The specification is referred to as Evolved Multimedia Broadcast Multicast Services (eMBMS) when transmissions are delivered through an LTE network. eMBMS is also known as LTE Broadcast.

Control plane protocol for the transport layer in 3rd Generation UMTS networks is called ALCAP. ALCAP is defined by 3GPP as equivalent of ITU recommendation Q.2630.2. Basic functionality of ALCAP is multiplexing of different users onto one AAL2 transmission path using channel IDs (CIDs). It is used in the UMTS access network UTRAN along with ATM, while IPBCP is use for IP links in the core of the network.

E-UTRA air interface of 3GPP LTE upgrade path for mobile networks

E-UTRA is the air interface of 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) upgrade path for mobile networks. It is an acronym for Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access, also referred to as the 3GPP work item on the Long Term Evolution (LTE) also known as the Evolved Universal Terrestrial Radio Access (E-UTRA) in early drafts of the 3GPP LTE specification. E-UTRAN is the initialism of Evolved UMTS Terrestrial Radio Access Network and is the combination of E-UTRA, user equipment (UE), and E-UTRAN Node B or Evolved Node B (EnodeB).

PDCP is an abbreviation for Packet Data Convergence Protocol. This protocol is specified by 3GPP in TS 25.323 for UMTS, TS 36.323 for LTE and TS 38.323 for 5G New Radio [NR). The PDCP is located in the Radio Protocol Stack in the UMTS/LTE/5G Air interface on top of the RLC layer.

CCPCH stands for Common Control Physical CHannel in UMTS and some other CDMA communications systems. It is a broadcast radio channel by which a mobile phone or user equipment can decode and determine important system parameters before establishing a dedicated communications link.

The Radio Resource Control (RRC) protocol is used in UMTS and LTE on the Air interface. It is a layer that exists between UE and eNB and exists at the IP level. This protocol is specified by 3GPP in TS 25.331 for UMTS and in TS 36.331 for LTE. RRC messages are transported via the PDCP-Protocol.

The UMTS frequency bands are radio frequencies used by third generation (3G) wireless Universal Mobile Telecommunications System networks. They were allocated by delegates to the World Administrative Radio Conference (WARC-92) held in Málaga-Torremolinos, Spain between 3 February 1992 and 3 March 1992. Resolution 212 (Rev.WRC-97), adopted at the World Radiocommunication Conference held in Geneva, Switzerland in 1997, endorsed the bands specifically for the International Mobile Telecommunications-2000 (IMT-2000) specification by referring to S5.388, which states "The bands 1,885-2,025 MHz and 2,110-2,200 MHz are intended for use, on a worldwide basis, by administrations wishing to implement International Mobile Telecommunications 2000 (IMT-2000). Such use does not preclude the use of these bands by other services to which they are allocated. The bands should be made available for IMT-2000 in accordance with Resolution 212 ." To accommodate the reality that these initially defined bands were already in use in various regions of the world, the initial allocation has been amended multiple times to include other radio frequency bands.

System Architecture Evolution (SAE) is the core network architecture of 3GPP's LTE wireless communication standard.

LTE Advanced

LTE Advanced is a mobile communication standard and a major enhancement of the Long Term Evolution (LTE) standard. It was formally submitted as a candidate 4G to ITU-T in late 2009 as meeting the requirements of the IMT-Advanced standard, and was standardized by the 3rd Generation Partnership Project (3GPP) in March 2011 as 3GPP Release 10.

The access stratum (AS) is a functional layer in the UMTS and LTE wireless telecom protocol stacks between radio network and user equipment. While the definition of the access stratum is very different between UMTS and LTE, in both cases the access stratum is responsible for transporting data over the wireless connection and managing radio resources. The radio network is also called access network.

 +- - - - - -+ +- - - - - - -+  | HTTP | | Application |  +- - - - - -+ +- - - - - - -+  | TCP | | Transport |  +- - - - - -+ +- - - - - - -+  | IP | | Internet |  +- - - - - -+ +- - - - - - -+  | NAS | | Network |  +- - - - - -+ +- - - - - - -+  | AS | | Link |  +- - - - - -+ +- - - - - - -+  | Channels | | Physical |  +- - - - - -+ +- - - - - - -+

Long Term Evolution (LTE) telecommunications networks use several frequency bands with associated bandwidths.

OTDOA is a positioning feature introduced in rel9 E-UTRA. It's a multilateration method in which the User Equipment (UE) measures the time difference between some specific signals from several enodeBs and reports these time differences to a specific device in the network. The ESMLC based on these time differences and knowledge of the enodeBs locations calculates the UEs' position.

Radio link control (RLC) is a layer 2 protocol used in UMTS and LTE on the Air interface. This protocol is specified by 3GPP in TS 25.322 for UMTS, TS 36.322 for LTE and TS 38.322 for 5G New Radio (NR). RLC is located on top of the 3GPP MAC-layer and below the PDCP-layer. The main tasks of the RLC protocol are:

Frequency bands for 5G NR are being separated into two different frequency ranges. First there is Frequency Range 1 (FR1) that includes sub-6GHz frequency bands, some of which are bands traditionally used by previous standards. The other is Frequency Range 2 (FR2) that includes frequency bands above 24 GHz and into the millimeter wave range, that has shorter range but higher available bandwidth than bands in the FR1.

References

  1. ↑ Holma, Harry and Antti Toskala (2004). WCDMA for UMTS. Wiley. ISBN   0-470-87096-6.
  2. ↑ Harri Holma and Antti Toskala (2006). HSDPA/HSUPA for UMTS: High Speed Radio Access for Mobile Communications. ISBN   0-470-01884-4.
  3. ↑ Dahlman, Erik and Stefan Parkvall, Johan Skold, Per Beming (2006). 3G Evolution HSPA and LTE for Mobile Broadband. Wiley. ISBN   978-0-12-374538-5.
  4. 1 2 3 4 5 6 "TS 25.301 Radio interface protocol architecture (FDD)" (PDF).
  5. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 "TS 25.211_PHYSICAL channels and mapping of transport channels onto physical channels (FDD) (R7)" (PDF).
  6. 1 2 3 4 5 6 "TS 25.211_PHYSICAL channels and mapping of transport channels onto physical channels (FDD) (R5)" (PDF).

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