NR-U Base Station Mobility Management via Neighbor Capability Exchange
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Solution Overview
Problem
The existing mobility management methods for NR-U base stations deployed in unlicensed spectra in 5G NR systems lack accuracy in managing user equipment due to the absence of unlicensed spectrum support capability information from neighboring base stations.
Innovation Solution
The proposed mobility management method involves an NR-U base station sending a request message to a neighboring base station through a preset or newly added inter-base station interface to obtain unlicensed spectrum support capability information, which is then used to determine the correct mobility management strategy for user equipment in the serving cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If NR-U base station performs mobility management without obtaining unlicensed spectrum support capability information from neighboring base stations, then the mobility management process is simple and fast, but the accuracy of mobility management is poor
Solution Approach 1:
The patent applies preliminary action by having the NR-U base station obtain unlicensed spectrum support capability information from neighboring base stations in advance, before actually performing mobility management operations. This is achieved through sending request messages to neighboring base stations to acquire their capability information regarding unlicensed spectrum support, frame structure types, and other relevant parameters. By preparing this information beforehand, the base station can make more accurate mobility management decisions without adding significant complexity to the actual handover execution process.
2Measurement precision
If NR-U base station obtains capability information from neighboring base stations through new interface, then the mobility management accuracy is improved, but the device complexity and interface requirements increase
Solution Approach 1:
The patent applies universality by designing the inter-base station interface to handle multiple functions simultaneously. The same interface is used for obtaining unlicensed spectrum support capability information, frame structure type information, and other neighboring base station parameters. This multi-functional approach avoids creating separate dedicated interfaces for each type of information exchange, thereby improving mobility management accuracy while limiting the increase in overall interface complexity.
3Reliability
If NR-U base station stores and delivers cell system information to user equipment, then user equipment can access the cell normally, but the base station requires more memory and information management capability
Solution Approach 1:
The patent applies the taking out principle by extracting and separating the cell system information into distinct components that can be independently managed and delivered. The base station obtains specific capability information from neighboring base stations and stores only the necessary portions required for user equipment access, such as frame structure type indicators and unlicensed spectrum support flags. This selective extraction reduces the overall information management burden while ensuring that all critical access-related information is available when needed.
Data Source
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AI summary
The present disclosure provides mobility management methods and apparatuses, and base stations. According to the method, when setting up an inter-base station interface with a neighboring base station, a request message is sent to the neighboring base station where the request message is used for requesting to obtain unlicensed spectrum support capability information of the neighboring base station; response information of the neighboring base station to the request message is determined; mobility management is performed on user equipment in a serving cell according to the response information. By utilizing the mobility management method provided in the present disclosure, the base station may adopt correct mobility management strategy to perform mobility management on UE in the serving cell, which improves the accuracy of mobility management of a 5G NR system.