8.12 Call Clearing

3GPP43.318Generic Access Network (GAN)Release 17Stage 2TS

Figure 24 shows call clearing initiated by the mobile station.

Figure 24: Mobile Station initiated Call clearing

1. The MS sends the Disconnect message to the CN to release the call. This message is contained in the GA-CSR UL DIRECT TRANSFER message between MS and GANC. The GANC forwards the Disconnect message to the CN.

2. The CN responds with a Release message to the GANC. The GANC forwards this message to the MS using the GA-CSR DL DIRECT TRANSFER message.

3. The MS responds with the Release Complete message. This message is contained within the GA-CSR UL DIRECT TRANSFER message between MS and GANC. The GANC forwards the Disconnect message to the CN.

4. The CN triggers the release of connection as described in clause 8.7.2.

8.13 Channel Modify

The GANC may use the Channel Modify procedures to modify parameters used for an ongoing call, this procedure may be used if coding scheme should be changed, in fault or congestion situations if the GANC for example detects "packet loss" and Handover to another GERAN/UTRAN mode is not possible or desired.

The GANC may modify the following parameters:

– Channel mode.

– Sample Size.

– IP address.

– RTP UDP port.

– RTCP UDP port.

Figure 25: Channel Mode Modify

1. A call is established as described in clauses 8.10 or 8.11.

2. The GANC sends the GA-CSR CHANNEL MODE MODIFY message to the MS to modify parameters for the established call.

3. The MS responds with the GA-CSR CHANNEL MODE MODIFY ACKNOWLEDGE message to the GANC.