Method, device and system for selecting gateway

Abstract

The embodiment of the invention discloses a method, a device and a system for selecting a gateway, which belong to the field of communication. The method comprises the following steps: selecting a service gateway which is integrated with a current local anchor point data gateway as a current service gateway while the service gateway is selected; and selecting a data gateway which is integrated with a current local anchor point service gateway as a current data gateway while the data gateway is selected. The device comprises a service gateway selection module and a data gateway selection module. The system comprises a target mobile management network element. In the invention, the current anchor point gateway is taken as a basis, the gateway which is integrated with the current anchor point gateway as far as possible is selected when the service gateway or the data gateway is selected, thereby the hop count of the data connection is reduced, and the efficiency of transmission data is improved.

Description

technical field [0001] The invention relates to the communication field, in particular to a method, device and system for selecting a gateway. Background technique [0002] The next-generation mobile packet network (EPS, Evolved Packet System) includes: mobile management network elements, such as: MME (Mobility Management Entity, mobile management entity) or SGSN (Serving GPRS Support Node, serving GPRS support node), responsible for mobile user terminals location management, connection management, security authentication, gateway selection, etc., wherein, gateway selection includes selection of serving gateway (S-GW, Serving Gateway), data gateway (P-GW, PDN Gateway), etc., S-GW is the user terminal The local access gateway, the P-GW is the gateway for the user terminal to access the external data network. When the user accesses non-roaming and optimizes the route of the visited place, the gateway integrating the S-GW and the P-GW should be used first to reduce the number ...

AI Technical Summary

Problems solved by technology

[0004] Case 1: After the UE is handed over from the Pre-R82 / 3G SGSN or the location is updated to the target mobility management NE, the target mobility management NE only obtains the IP address of the anchored P-GW. - IP address information of the GW, the target mobility management network element cannot obtain the region and unification information of the currently anchored P-GW (the unification information refers to: whether it is a device in which the S-GW and P-GW are integrated), so the handover Or when the location is updated, when the target mobility management network element selects the S-GW, it cannot preferentially select the local integrated gateway where the anchored P-GW is located as the target S-GW

[0005] The second case: After the UE attaches to a new network or switches (location update) to a new target network, the UE will select the S-GW to establish a new service (for example: PDN (Packet Data Network, packet data network) connection), or restore the PDN connection service that has been established on the source network; when the UE has established one or more PDN connections, the S-GW has been selected, and if the UE requests a new PDN connection, the MME is performing P- When GW is selected, only the corresponding P-GW list is obtained according to the new APN (Access Point Name, access point name) analysis, and the unified gateway where the current S-GW is located is not preferentially selected as the P-GW at the same time

[0006] Case 3: During the handover or location update process where the mobility management network element changes, the target MME can obtain the IP address of the source S-GW before the target S-GW selects, but only based on the IP address information, the target The MME on the source side cannot obtain the precise location information of the S-GW on the source side, so that the MME on the target side cannot make an accurate judgment when judging whether to continue using the S-GW on the source side according to the network topology. P-GW is usually not an all-in-one gateway

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