RedCAP UE Target Cell Selection Using NR Light Assistance
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Solution Overview
Problem
In 5G networks, 5G base stations struggle to select an appropriate target cell for handover or determine an appropriate target cell for paging RedCAP UE devices, particularly during movement, due to the reduced capabilities and complexity of RedCAP UEs.
Innovation Solution
Implementing NR light assistance information to determine and hand over RedCAP UEs to appropriate target cells by integrating network elements like CU and DU, and utilizing F1 and Xn interfaces for communication and assistance information exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If 5G base station uses conventional cell selection methods, then general UE handover can be performed, but RedCAP UE handover fails due to reduced UE capabilities
Solution Approach 1:
The patent segments the cell selection process into two distinct paths: one for conventional UE using traditional measurement and selection methods, and another for RedCAP UE that utilizes pre-configured assistance information from the base station. This segmentation allows each UE type to receive appropriately optimized handling, resolving the contradiction between maintaining reliability for conventional UE and achieving adaptability for RedCAP UE.
Solution Approach 2:
The base station performs preliminary actions by pre-calculating and providing assistance information (including candidate cell IDs and offset values) to RedCAP UEs before handover is needed. This preliminary action enables RedCAP UEs with reduced capabilities to perform simplified measurements and selections, ensuring handover reliability without requiring full UE processing capabilities.
2Reliability
If 5G base station implements assistance information processing, then RedCAP UE handover succeeds, but system complexity increases
Solution Approach 1:
The base station implements a universal assistance information generation mechanism that serves both conventional UE and RedCAP UE. The same assistance information infrastructure benefits multiple UE types, with RedCAP UE utilizing the pre-calculated information while conventional UE continues with standard procedures. This multi-functionality reduces the relative complexity burden on the base station.
Solution Approach 2:
The system enables self-service by allowing RedCAP UEs to autonomously use the provided assistance information to determine their own target cells through simplified measurements and calculations. This self-service approach reduces the need for complex base station-controlled handover procedures, thereby reducing overall system complexity while maintaining handover reliability.
3Device complexity
If RedCAP UE uses reduced capabilities, then UE cost and complexity decrease, but target cell determination fails
Solution Approach 1:
The base station acts as an intermediary by providing pre-calculated assistance information that bridges the gap between RedCAP UE's reduced capabilities and the complex task of target cell determination. The assistance information (candidate cell IDs, offset values) mediates the process, allowing RedCAP UEs to perform simple local calculations rather than complex autonomous cell selection, thus maintaining ease of operation despite reduced UE capabilities.
Solution Approach 2:
The patent changes the operational parameters of RedCAP UEs by providing pre-configured assistance information that transforms the cell selection task from a complex autonomous process into a simplified measurement and comparison process. The parameter changes include using pre-provided candidate cell lists and offset values, which allow RedCAP UEs with reduced processing capabilities to successfully determine target cells.
Data Source
AI summary
Provided are a communication method and device and a storage medium. A communication method applied to a first network element includes determining a target cell according to the received new radio (NR) light assistance information; and handing a first communication node over to the target cell or paging the first communication node in the target cell.