9 Channel configurations

3GPP44.003Mobile Station - Base Station System (MS - BSS) Interface Channel Structures and Access CapabilitiesRelease 17TS

At a given moment, a Mobile Station accesses only a limited number of channels appearing on its radio interface. Different compositions for the accessed channels set are identified, and specified below.

Different channel configurations are:

i) BCCH;

ii) CCCH;

iii) CCCH + BCCH;

iv) SDCCH + SACCH;

v) Bm + FACCH + SACCH;

vi) Lm + FACCH + SACCH;

vii) Lm + Lm + FACCH + SACCH;

viii) ( n + m ) Bm + FACCH + ( n + m ) SACCH;

where n is the number of bi-directional channels and m is the number of uni-directional channels (n = 1..8, m = 0..7, n + m = 1..i);

ix) PCCCH + PBCCH;

x) ( n + m ) PDTCH + PACCH + PTCCH

where n is the number of channel allowing information streams in both directions and m is the number of channels allowing information streams in one direction (n = 0..8, m = 0..8, n + m = 1..8).

xi) CPBCCH;

xii) CPCCCH;

xiii) CPCCCH + CPBCCH

xiv) EC-BCCH;

xv) EC-CCCH;

xvi) EC-CCCH + EC-BCCH

Configurations i), xi) and xiv)are normally used only in the phase when the physical connection is not set (i.e. just after switch-on, or after a too long interruption of the physical connection due to poor propagation conditions).

Configurations ii) or iii) are used by active but idle MS or MS in packet wait state (see GSM 44.060).

Configurations iv) is used in phases when only a dedicated control channel is needed.

Configurations v) to viii) are used in particular when a circuit-switched communication is in progress.

Configuration viii) is a Multislot Configuration. Possible combinations of bi- and uni-directional channels are defined in 3GPP TS 45.002.

Configurations ix), xii), and xiii) are used by MS in packet wait state.

Configuration x) is a Multislot Configuration on packet data traffic channels. Possible combinations of bi- and uni- directional channels are defined in 3GPP TS 45.002.

In addition, a MS of GPRS MS class A (see 3GPP TS 22.060) may combine one of the configurations i) to viii) (to support GSM circuit switched services and SMS) with one of the configurations ii), iii), ix), or x) (to support GSM GPRS services).

Configurations xiv) or xv) are used by active but idle EC-EGPRS MS or an EC-EGPRS MS in packet wait state.

9.1 Mandatory capabilities

The following access capabilities are mandatory for all MSs.

– All MSs supporting circuit-switched services shall support SDCCH.

– If a given service is supported by an MS on a TCH/H, this MS shall support this service on a TCH/F (but not necessarily vice versa).

– An MS supporting a service on TCH/F shall support the signalling only mode on TCH/F as well as the signalling modes associated with the TCH/F.

– An MS supporting a service on TCH/H shall support the signalling only mode on TCH/F as well as the signalling modes associated with the TCH/H.

Annex A (informative):
Change History

TSG #	TSG Doc.	CR	Rev	Subject/Comment	New
December 2015	–	–	–	Release 13 version based on version 12.0.0	13.0.0
GP-68	GP-151170	0009	1	Introduction of EC-EGPRS	13.0.0

Change history
Date	TSG #	TSG Doc.	CR	Rev	Cat	Subject/Comment	New
2017-03	RP-75	–	–	–	–	Release 14 version (frozen at TSG-75)	14.0.0
2018-06	RP-80	–	–	–	–	Release 15 version (frozen at TSG-80)	15.0.0
2020-07	RP-88e	–	–	–	–	Upgrade to Rel-16 version without technical change	16.0.0
2022-03	RP-95e	–	–	–	–	Upgrade to Rel-17 version without technical change	17.0.0