Base Station Relay UE Selection Using SD-RSRP Path Switching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The 3GPP has not defined a determination technique for selecting an appropriate relay user equipment (UE) during switching from an indirect path to another indirect path in Sidelink communication, making it difficult to choose the right relay UE.
Innovation Solution
A base station acquires and compares signal strength information between a first UE and potential relay UEs using discovery reference signal strength (SD-RSRP) to determine the most suitable relay UE for maintaining communication quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If relay communication is implemented via a relay UE to extend communication coverage, then communication coverage area is improved, but difficulty in detecting and measuring signal strength for relay selection increases
Solution Approach 1:
The patent uses discovery reference signals as an intermediary mechanism to enable the base station to indirectly measure signal strength between the first UE and potential relay UEs. The base station transmits discovery reference signals, which are relayed through candidate relay UEs, allowing the base station to measure SD-RSRP values without direct access to the first UE's measurements, thus resolving the measurement difficulty while maintaining extended coverage
Solution Approach 2:
The patent implements a feedback mechanism where the base station measures SD-RSRP values from discovery reference signals and uses this feedback information to determine the optimal relay UE for path switching. This feedback loop enables informed relay selection decisions based on actual signal strength measurements, addressing the measurement difficulty while preserving coverage extension benefits
2Reliability
If path switching between indirect paths is enabled to maintain communication quality, then communication quality is improved, but device complexity increases due to lack of determination technique
Solution Approach 1:
The patent changes the measurement parameter from traditional RSRP (measured by UEs) to SD-RSRP (measured by base station from discovery reference signals). This parameter change simplifies the relay selection determination process by providing a base-station-centric measurement approach that directly supports path switching decisions without requiring complex UE-side measurement coordination and reporting mechanisms
Solution Approach 2:
The base station performs self-service by directly measuring SD-RSRP values itself rather than relying on UE measurements and reports. This self-measurement capability simplifies the overall system complexity by eliminating the need for complex measurement configuration, reporting, and processing procedures between UEs and base station, while enabling reliable path switching for communication quality maintenance
Data Source
AI summary
A base station is disclosed including, in a case where communication between a first user equipment (UE) and a base station is in a first state where relay communication to be implemented via a second UE for relaying communication is executed, an acquisition unit configured to acquire first signal strength information indicating a signal strength between the first UE and the second UE and second signal strength information indicating a signal strength between the first UE and a third UE that is disconnected from the first UE, and a comparison unit configured to compare the first signal strength information with the second signal strength information in the first state. The first signal strength information and the second signal strength information are information indicating signal strengths of a same physical channel.