Mobility enhancement scheme based on double-connection design for 5G user-centric network

Abstract

The invention provides a mobility enhancement scheme based on a double-connection design for a 5G user-centric network. According to the mobility enhancement scheme provided by the invention, a macro cell serves as a MeNB to provide a control function, a micro cell serves as a SeNB to provide data service, and the MeNB and the SeNB adopt the double-connection design to provide UE-Centric high-quality service. Firstly, a user reports measured RSRP information of Small Cells that can be received to the macro cell, and the macro cell serves as the MeNB to trigger the SeNBs to monitor the SRS. The SeNBs feed back uplink monitoring conditions to the MeNB for the auxiliary addition / release / modification SeNB decision of the MeNB. According to the mobility enhancement scheme provided by the invention, the downlink measurement is replaced by SRS monitoring, namely the SeNB monitors the uplink SRS of the user to replace the PSS / SSS for uplink channel estimation. According to the mobility enhancement scheme provided by the invention, public system messages and cell level control signals in UCN can be reduced by a reinforced cell discovery mechanism and a measurement mechanism monitored by the SRS, the interference from the SeNB is reduced, and more resources can be used for transmitting data business.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to the composition of a user-centric network (UCN, User Centric Network) and the research on user mobility in an ultra-dense network scenario in a fifth-generation mobile communication system (5G). Background technique [0002] Due to the characteristics of small cells (Small cells) that are easy to deploy and have low power, in 3GPP LTE R12 (the 3rd Generation Partnership Project Long Term Evolution Release 12), small cell enhancements have attracted much attention. In order to achieve a high data rate of 10Gbps and ubiquitous services anytime and anywhere in the 5G network, a large number of small cells are flexibly deployed in the service area to form an ultra-dense network (UDN, Ultra-DenseNetwork) to provide seamless Coverage and service leakage of existing macro base stations, improving system capacity. The dense network based on the ultra-dense deploym...

AI Technical Summary

Problems solved by technology

The main challenges in the new scenario proposed by the small cell enhancement working group are: 1) The non-ideal backhaul will increase the coordination delay between the macro base station and the small base station, so the highest data peak rate and optimal resource cannot be achieved use

2) The dense deployment of small base stations will lead to an increase in the number of handovers, and frequent handovers will increase the signaling burden of the wireless network and the core network

3) The increase of interference causes the handover failure rate to increase

4) The transmission power of different base stations is different, which will cause power imbalance, especially in the case of co-frequency deployment

Under UDN, the delay caused by the smaller coverage and handover (HO, Handover) process of the small cell will make the failure rate higher

Especially for high-speed mobile users, if the previous handover criteria are still used, so that the moment when the handover occurs is in the central area of ​​the target small station, the target station will cause great interference to the user, and the user and the original small station out of sync

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