Ericsson Radio Systems AB PKRC1311004-1 Manual De Usuario

Call Control

•

The link establishment procedure is in accordance with /
GSM 08.58.3.1/ and /GSM 04.06:5.4.1/

20.8

Link Release Indication

Purpose

To release a link layer connection between MS and the network.

Precondition and Initiation

Channel combination supported is defined in section Channel Activation
above.

The Link Release Indication function is applicable for:

•

SAPI-0 on SDCCH and FACCH

•

SAPI-3 on SDCCH, SACCH/T and SACCH/M

The function is initiated when the RBS receives a DISC frame from MS.

Description

The following procedure is used by RBS to indicate to BSC that a link
layer on the air interface has been released by an initiative from the MS
(disconnect). The MS sends a DISC frame on a link layer connection in
multiframe mode. Multiframe mode means that an answer UA
(unnumbered acknowledgment) is required. The RBS then sends a
RELease INDication message to BSC to confirm the release of the link
layer. It is the mobile that takes initiative for the release. This is used
when the signalling between MS and network is done and the link is no
longer needed.

P003017A

BTS

BSC

REL IND

first DISC

Figure 89

Link release indication

•

The link release procedure is in accordance with /GSM 08.58:3.3/,
/GSM 08.58:8.3.9/ and for RELease INDication with /
GSM 08.58:8.3.9/.

•

Collision cases are treated as specified in Technical Specification
GSM 04.06.

•

Fault handling related to the link release procedure is in
accordance with /GSM 04.06:5.4.4/.

200 (421)

EN/LZT 720 0008

R1A

2001-06-26