Method for changing core network nodes for mobile relay users

Abstract

The invention provides a method for changing core network nodes for mobile relay users. The method includes: an MRN (mobile relay node) detects change in current location and transmits change information to a current MME (mobility management entity) of UE (user equipment); the MME of the UE needing to be changed is determined according to the location information received by the current MME and other preset information of the UE, and change to the MME of the UE is triggered; a new MME group is selected for the UE through the MRN or the current MME, a new MME is selected from the new MME group on the basis of load balance; the new MME acquires UE context from the current MME, and UE P-GW (packet data network gateway) and UE S-GW (serving gateway) are determined for the UE. Core network nodes can be changed for the UE under the MRN by the method while a base station is unchanged by the UE, and transmission source load of UE data is effectively decreased.

Description

technical field [0001] The invention relates to the technology in the mobile relay system, in particular to a method for changing the core network node of the mobile relay user. Background technique [0002] When the user takes the high-speed rail, the LTE UE accesses the LTE network through the MRN deployed on the high-speed rail and accesses the external network through the UE P-GW in the LTE network. figure 1 A self-backhaul network architecture is given to support UE under MRN to access external networks. Among them, the MRN accesses the MRN backhaul transmission network (including the DeNB and the MME / S-GW / P-GW serving the MRN) through the DeNB, and connects to the MME / S-GW serving the UE under the MRN through the MRN backhaul transmission network, and the UE then The external network is accessed by the UE P-GW. The two thick curves in the figure respectively represent S1-C between MRN and UE MME and S1-U between MRN and UE S-GW. [0003] figure 2 It is a schematic...

AI Technical Summary

Problems solved by technology

[0011] In the above process, the trigger condition for MME to unload UE does not take into account the burden of UE data transmission resources, and it cannot unload UE in a targeted manner according to the status of UE, so it cannot effectively relieve the transmission pressure of S5 / S8 interface transmission resources

[0012] In addition, when the UE moves with the base station in a large range, the new MME is different from the MMEPool to which the original MME belongs, and how to determine the new MME Pool for the UE is currently not considered.

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