Terminal position management method under relay node

Abstract

The invention discloses a terminal position management method under a relay node, which defines a tracking area updating process of a user terminal under the relay node RN as follows: user equipment (UE) sends a Tracking Area Update Request message to the relay node RN, and the relay node RN embeds an IMSI_RN (International Mobile Subscriber Identity Request) of the relay node RN at the tail of the TAU Request message and forwards the IMSI_RN to a core network; and after the core network receives the TAU Request forwarded by the relay node RN, a corresponding location area code is checked when the user terminal sends the location area, and when the location area code is dedicated to the relay node RN, namely belongs to a set {TAC_RN}, the IMSI_RN at the tail part of the TAU Request is taken out and recorded by the core network. The actual position area of the terminal under the relay node can be obtained in real time, and more signaling processes are not added to an existing system.

Description

technical field [0001] The invention relates to the field of mobile communication, in particular to a terminal location management method under a relay node. Background technique [0002] High-speed railway is an important scenario for wireless cellular communication. The number of users in high-speed rail trains is concentrated, and has the characteristics of high value and high demand. In the current high-speed rail coverage scheme, private network base stations usually use macro station line-of-sight propagation. Because the high-speed rail runs fast and the attenuation of the wireless signal by the train body is high (20-30dB), handover failure or poor connection quality often occurs. The frequency band used by 5G NR is mainly 3.5GHz, and the propagation and penetration loss is greater than that of the original LTE frequency band. [0003] In view of the above problems, the industry has proposed fixed relay solutions (such as CN102082713B, CN106899984B, CN106851856A, ...

AI Technical Summary

Problems solved by technology

This method can reduce the paging range, but every time the RN accesses a new location area, it needs to notify all the MMEs that the UE under the RN accesses, which increases more signaling procedures

In addition, in this method, it is not clearly stated how the core network determines the RN to which the UE belongs.

At present, only UE location area information is stored in the Home Location Register (HLR). There are more than 5,000 EMUs in the country. Obviously, it is impossible to assign an independent TAC to each different on-board RN.

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