Figure 3 Inter-SGSN SRNC relocation procedure


http://localhost:7904/pages/31185199/02/31185199/02/resources/figure/ch/SGSN/fig_60_128.png

The Inter-SGSN SRNC relocation procedure is as follows:

Based on the wireless network situation, the Serving RNC determines
whether to initiate SRNC relocation. It sends the Old SGSN the RELOCATION
REQUIRED message to provide services for the MS by using the New RNC.
The RELOCATION REQUIRED message carries the target RAI (4600012340001)
and RNC ID (1111). After receiving the relocation request, the SGSN
initiates a domain name resolution request to the DNS server. The
domain name to be resolved is converted from the target RAI and RNC
ID, such as RNC1111.LAC1234.MNC0000.MCC0460.GPRS.

1. The DNS server returns the SGSN the resolution result, which is
   the IP address of the new SGSN signaling plane, such as 10.161.234.254.
2. Based on the resolution result, the old SGSN sends the relocation
   request to the new SGSN.
3. After receiving the request, the new SGSN prepares for relocation.
   Then, it sends the relocation preparation complete message to the
   old SGSN.
4. The old SGSN performs the subsequent relocation procedure.

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