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Content for  TS 43.064  Word version:  18.0.0

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4 Packet data logical channels  4.1 General  4.2 Packet Common Control Channel (PCCCH) and Compact (CPCCCH)  4.3 Packet Broadcast Control Channel (PBCCH) and Compact Packet Broadcast Control Channel (CPBCCH) - downlink only  4.4 Packet Traffic Channels  4.5 Packet Dedicated Control Channels  4.6 MBMS Common Control Channels 
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4  Packet data logical channels  p. 21

4.1  General  p. 21

This subclause describes the packet data logical channels that are supported by the radio subsystem. The packet data logical channels are mapped onto the physical channels that are dedicated to packet data.
The physical channel dedicated to packet data traffic is called a Packet Data Channel (PDCH).

4.2  Packet Common Control Channel (PCCCH) and Compact (CPCCCH)  p. 22

PCCCH and CPCCCH comprises logical channels for common control signalling used for packet data as described in the following subclauses. (See sub-clause 3.2a).

4.2.1  Packet Random Access Channel (PRACH) and Compact Packet Random Access Channel (CPRACH) - uplink only  p. 22

PRACH and CPRACH are used by MS to initiate uplink transfer for sending data or signalling information. Packet Access burst and Extended Packet Access burst are used on PRACH. Extended Packet Access burst is used on CPRACH.

4.2.2  Packet Paging Channel (PPCH) and Compact Packet Paging Channel (CPPCH) - downlink only  p. 22

PPCH and CPPCH are used to page an MS prior to downlink packet transfer. PPCH and CPPCH use paging groups in order to allow usage of DRX mode. PPCH can be used for paging of both circuit switched and packet data services. The paging for circuit switched services on PPCH is applicable for class A and B GPRS MSs in Network operation mode I, see TS 23.060.

4.2.3  Packet Access Grant Channel (PAGCH) and Compact Packet Access Grant Channel (CPAGCH) - downlink only  p. 22

PAGCH and CPAGCH are used in the packet transfer establishment phase to send resource assignment to an MS prior to packet transfer.

4.3  Packet Broadcast Control Channel (PBCCH) and Compact Packet Broadcast Control Channel (CPBCCH) - downlink only  p. 22

PBCCH and CPBCCH broadcast packet data specific System Information. If PBCCH is not allocated, the packet data specific system information is broadcast on BCCH. For Compact, CPBCCH shall be allocated. CPBCCH and BCCH are mutually exclusive. (See sub-clause 3.2a).

4.4  Packet Traffic Channels  p. 22

4.4.1  Packet Data Traffic Channel (PDTCH, EC-PDTCH)  p. 22

PDTCH is a channel allocated for data transfer. It is temporarily dedicated to one MS or to a group of MSs in the case of p-t-m transmission. In the multislot operation, one MS or a group of MSs may use multiple PDTCHs in parallel for individual packet transfer.
All packet data traffic channels are uni-directional, either uplink (PDTCH/U), for a mobile originated packet transfer or downlink (PDTCH/D) for a mobile terminated packet transfer.
A packet data traffic channel supporting operation in extended coverage is referred to as Extended Coverage PDTCH (EC-PDTCH).
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4.5  Packet Dedicated Control Channels  p. 23

4.5.1  Packet Associated Control Channel (PACCH, EC-PACCH)  p. 23

PACCH conveys signalling information related to a given MS. The signalling information includes e.g. acknowledgements and power control information. PACCH carries also resource assignment and reassignment messages, comprising the assignment of a capacity for PDTCH(s) and for further occurrences of PACCH. The PACCH shares resources with PDTCHs, that are currently assigned to one MS. Additionally, a MS that is currently involved in packet transfer, can be paged for circuit switched services on PACCH.
A Packet Associated Control Channel supporting operation in extended coverage is referred to as Extended Coverage PACCH (EC-PACCH). The EC-PACCH shall not be used to page a MS in extended coverage for circuit switched services.
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4.5.2  Packet Timing advance Control Channel, uplink (PTCCH/U)  p. 23

PTCCH/U is used to transmit random access burst to allow estimation of the timing advance for one MS in packet transfer mode.
PTCCH/U shall not be used for DTM.
PTCCH/U shall not be used for a mobile station in EC operation.

4.5.3  Packet Timing advance Control Channel, downlink (PTCCH/D)  p. 23

PTCCH/D is used to transmit timing advance information updates to several MS. One PTCCH/D is paired with several PTCCH/U's.
PTCCH/D shall be ignored by MS operating in DTM.
PTCCH/D shall be ignored by a mobile station in EC operation.

4.6  MBMS Common Control Channels |R6|  p. 23

4.6.1  MBMS Packet Random Access Channel (MPRACH) - uplink only  p. 23

The MPRACH is used by the MS during the initial counting procedure for MBMS (see TS 44.060). Packet Access burst and Extended Packet Access burst are used on MPRACH.

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