Reference Manual

ManualsBrandsEricsson Radio Systems ManualsElectronicsPCS Broadband GSM Base station

261

262

263

264

265

266

267

268

269

270

Call Control

SAPI-3

SAPI-3 is used for SMS point-to-point. The following channels are

supported:

SDCCH Acknowledged mode is supported.

SACCH/T Acknowledged mode is supported.

SACCH/M Unacknowledged mode is supported.

Description

LAPDm (Link Access Procedure on the Dm-channel) is a protocol that

operates at the data link layer of the OSI structure. It receives service

from the physical link (layer 1) and provides services to the net (layer

3).

The LAPDm function denotes the overall functionality included in the

LAPDm protocol and the radio link layer management procedures.

LAPDm conﬁrms to /GSM 04.06/.

This function is used to send signalling information in between MS and

RBS on the air interface.

26.15 Channel Reactivation

Purpose

To reactivate an already activated, dedicated channel resource with new

parameters.

Precondition and Initiation

The function is initiated when a CHANNEL_ACTIVATION /

GSM 08.58:4.1/ message is received from BSC.

Supported channel combinations /GSM 05.02:6.4/

• (i) TCH/F + FACCH/F + SACCH/TF

•

(ii) TCH/H(0.1) + FACCH/H(0.1) + SACCH/TH(0.1)

•

(v) FCCH + SCH + BCCH + CCCH + SDCCH/4[0...3] +

SACCH/C4[0...3]

• (vii) SDCCH/8[0...7] + SACCH/C8[0...7]

• (viii) TCH/F + FACCH/F + SACCH/M

• (ix) TCH/F + SACCH/M

• (x) TCH/FD + SACCH/MD

Supported channel numbers /GSM 08.58:9.3.1/

• Bm + ACCHs

• Lm + ACCHs

• SDCCH/4 + ACCH

268 (485)

EN/LZT 720 0008 P2A

2001-11-28

Preliminary