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Moving to R8-SGSN/MME from PreR7 SGSN with Context in GGSN

IP.com Disclosure Number: IPCOM000172086D
Published in the IP.com Journal: Volume 8 Issue 7A (2008-07-10)
Included in the Prior Art Database: 2008-Jul-10
Document File: 2 page(s) / 31K

Publishing Venue

Siemens

Related People

Juergen Carstens: CONTACT

Abstract

The GGSN (Gateway GPRS Support Node, GPRS: General Packet Radio System) provides access to services in 3GPP (Third Generation Partnership Project) R7 (Release 7) and earlier networks. At least in the first years of EPS (Evolved Packet System) deployment operators will have GGSNs in their networks which will ultimately be replaced by a SGW (Serving Gateway) and PGW (PDN Gateway; PDN: Pubilc Data Network). The problem arising in this context is that when users move to R8 UTRAN/eUTRAN (evolved UMTS Terrestrial Radio Access Network, UMTS: Universal Mobile Telecommunications System) the GGSNs cannot be used anymore. It has to be identified if the R7 SGSN (Serving GPRS Support Node) was in contact with a GGSN or a PGW and how to handle this situation.

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Moving to R8-SGSN/MME from PreR7 SGSN with Context in GGSN

Idea: Tom Grahn, FI-Espoo; Tomi Nurminen, FI-Espoo

The GGSN (Gateway GPRS Support Node, GPRS: General Packet Radio System) provides access to services in 3GPP (Third Generation Partnership Project) R7 (Release 7) and earlier networks. At least in the first years of EPS (Evolved Packet System) deployment operators will have GGSNs in their networks which will ultimately be replaced by a SGW (Serving Gateway) and PGW (PDN Gateway; PDN: Pubilc Data Network). The problem arising in this context is that when users move to R8 UTRAN/eUTRAN (evolved UMTS Terrestrial Radio Access Network, UMTS: Universal Mobile Telecommunications System) the GGSNs cannot be used anymore. It has to be identified if the R7 SGSN (Serving GPRS Support Node) was in contact with a GGSN or a PGW and how to handle this situation.

A novel solution to the problem mentioned above is presented in the following. A possible scenario, how a GGSN may come in contact with R8 is depicted in Figure 1, step 4. The MME (Mobility Management Entity) may want to select a SGW to establish an EPS bearer. However, the old SGSN may have established a PDP context towards a GGSN (PDP: Packet Data Protocol). In this case, the MME has to delete the PDP context from the GGSN and requests the UE (User Equipment) to re- attach in the eUTRAN.

Another scenario is shown in step 15. Here, the SGW sends an GGSN IP address update by means of GTPv2 (GPRS Tunneling Protocol version 2). If the peer is a GGSN it responds with a "Version not sup...