MME Gateway Selection for Mobile Relay Nodes
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Solution Overview
Problem
In high-speed mobile environments, the DeNB deployed may not be integrated with the functions of the SGW/PGW of a mobile RN, making it difficult to select the appropriate PGW and SGW for the mobile RN, as the DeNB is typically not aware of the IP address of the SGW/PGW located in the core network.
Innovation Solution
A method where the MME receives identity indication information from the DeNB, determines if the RN is mobile, and selects a PGW from the core network based on this information, with the mobile RN sending identity indication information during RRC connection establishment and the DeNB forwarding this information to the MME, which then acquires subscription data to make the appropriate selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the DeNB is deployed without integrated SGW/PGW functions to reduce device complexity and enable core network gateway selection, then the MME can select appropriate gateways, but the DeNB cannot determine PGW IP addresses and gateway selection becomes difficult
Solution Approach 1:
The patent introduces the MME as an intermediary that receives identity indication information from the DeNB, queries the HSS for subscription data, and performs the gateway selection based on the RN's mobility status. This mediator resolves the contradiction by enabling gateway selection without requiring the DeNB to have integrated SGW/PGW functions or knowledge of PGW IP addresses.
2Ease of operation
If the DeNB integrates SGW/PGW functions to simplify gateway selection, then gateway selection becomes easier, but device complexity and cost increase
Solution Approach 1:
The patent segments the gateway selection function from the DeNB and places it in the MME. The DeNB only needs to forward identity indication information, while the MME handles the complex gateway selection logic by querying subscription data from the HSS. This segmentation reduces DeNB complexity while maintaining ease of gateway selection.
3Reliability
If the RN is identified as mobile to select core network PGW, then signal quality and handover performance improve, but the DeNB cannot determine appropriate PGW without additional information
Solution Approach 1:
The patent uses preliminary action by having the MME query the HSS for subscription data before gateway selection. The subscription data contains information indicating whether the RN is mobile, allowing the MME to proactively select the appropriate PGW type (core network PGW for mobile RNs) before the DeNB needs to establish connections, ensuring signal quality and proper handover performance.
Data Source
AI summary
The present invention relates to the technical field of wireless communications. Disclosed are a gateway selection method and device, which are used to solve the problem of how to select a packet data gateway (PGW) for a mobile relay node (RN). In the present invention, a mobility management entity (MME) receives an initial UE message carrying identity indication information of the RN and sent by a donor base station DeNB; acquiring subscription data of the RN from a home subscriber server (HSS); the MME determining, according to the identity indication information and/or subscription data of the RN, whether the RN is a mobile RN, and if the determination is yes, selecting a PGW located in a core network as the PGW of the RN. By means of the present invention, the problem of how to select the PGW for the mobile RN is solved.