Method and device for selecting gateway in mobile communication network as well as system comprising device

[0029] Example 1

[0030] In this example, the APN with the user's login identifier is resolved as the extension. Preferably, the APN with part of the user's login identifier is parsed as the extension.

[0031] As shown in Table 2, in the DNS server, the APN and some user login (eg home location registration HLR/home user server HSS) identifiers are bound with the IP address of the dedicated gateway.

[0032] Table 2 APN and some user login identifiers are bundled in the DNS server

[0033] APN.SRI

[0034] like image 3 As shown, when the MS/UE is connected to the network, the Serving GPRS Support Node (SGSN) or the Mobility Management Engine (MME) will obtain the user login identifier (S300), and log the user in before sending a query to the DNS server (S302). The identifier (preferably a part of it) is added to the APN as an extension, then the DNS server will return the private gateway IP address to select the gateway (S304).

[0035] In the case of this example, the DNS record in the DNS server is configured as: access point name APN+home location registration HLR number>gateway GPRS support node IP.

[0036] In addition, in the case of this example, if a new HLR is added, the method for selecting a gateway according to this embodiment of the present invention may further optionally include an adding step for adding the newly added home location registration number to the DNS server.

[0037] Example 2

[0038] In this example, the APN with the user login predefined token is parsed as the extension.

[0039] In user login (HLR/HSS), a predefined flag indicating a specific home area is added to each subscribed APN.

[0040] As shown in Table 3, in the DNS server, an APN with a predefined tag is bound with the IP address of the private gateway.

[0041] Table 3 APNs with predefined tags bundled in DNS server

[0042] APNs with predefined tags

[0043] In the MS, the APN itself (eg CMWAP or CMNET, untagged) is used to activate the PDP context, which means there is no impact on the MS side.

[0044] In the Serving GPRS Support Node (SGSN) or Mobility Management Entity (MME), the APN from the MS is used as a prefix to find which subscribed APN should be used for the current PDP activation.

[0045]On the other hand, if the Serving GPRS Support Node (SGSN) can get the province, city and district flags from the user login (HLR/HSS) ID, the Serving GPRS Support Node (SGSN) can bind the APN from the MS and use it for DNS resolution mark. Then, there is no need to add tags in the user login (HLR/HSS).

[0046] like Figure 4 Shown is a schematic diagram of a method according to an embodiment of the present invention applied in a mobile communication system. First, the roaming user MS from province B sends a PDP activation request to the Serving GPRS Support Node (SGSN) (S400).

[0047] In response to the PDP activation request, the SGSN first searches in the cache of the SGSN whether there is a dedicated gateway IP address corresponding to the user's APN+HLR number (S402), and if the corresponding dedicated gateway IP address is found (S404), then According to this, a PDP request is generated and sent to the Host GGSN in Province B (S410); if the corresponding dedicated gateway IP address is not found, the SGSN initiates a DNS resolution request containing the APN+HLR number to the DNS server (S406), and the DNS server will The HOSTGGSN IP address bound with the APN+HLR number is returned to the SGSN (S408). The SGSN generates a PDP request according to the HOSTGGSN IP address returned by the DNS server and sends it to the Host GGSN in Province B (S410).

[0048] The SGSN can also directly initiate a DNS resolution request containing the APN+HLR number to the DNS server in response to the PDP activation request from the roaming user. The server is less burdened, resulting in the least delay in PDP activation time.

[0049] Also, use only the access point name APN for local users. Also for the local MS, the SGSN has a good chance of finding the HOST GGSN IP in the cache according to the number of local HLRs and the size of the cache.

[0050] like Figure 5 As shown, it is a schematic structural diagram of an apparatus for selecting a gateway in a mobile communication network according to an embodiment of the present invention, which mainly includes a request module 504 and a return module 506; in addition, it also optionally includes a configuration module 500, a search module 502, and Generate module 508 .

[0051] The configuration module 500 is configured to configure the DNS server after binding the expanded access point name and the IP address of the dedicated gateway.

[0052] The search module 502 is used to make the serving GPRS support node respond to the PDP activation request of the roaming user, and use the expanded access point name to look up the private gateway IP address in the cache of the serving GPRS support node; wherein if the private gateway IP address is found, then The serving GPRS support node generates a PDP request according to the dedicated gateway IP address and sends it to the host gateway GPRS support node (Host GGSN); otherwise, the request module 504 is run.

[0053] The request module 504 is configured to make the serving GPRS support node respond to the PDP activation request of the roaming user, and initiate a DNS resolution request to the DNS server by using the expanded access point name.

[0054] Returning module 506 is used to make the DNS server return the dedicated gateway IP address bound with the expanded access point name to the serving GPRS support node.

[0055] The generating module 508 is configured to enable the serving GPRS support node to generate a PDP request according to the IP address of the dedicated gateway returned by the DNS server and send it to the host GGSN.

[0056] In addition, in the case where the APN with some user login identifiers is parsed as an extension, if a new HLR is added, the device according to this embodiment may optionally further include an adding module for adding the newly added home location registration number. to the DNS server.