Sidelink Relay Selection via Pathloss Determination
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Solution Overview
Problem
Current wireless communication systems face challenges in accurately determining sidelink pathloss between remote UEs and relay UEs, especially due to the lack of readily available transmit power information from relay UEs.
Innovation Solution
The proposed solution involves methods and procedures for wireless communication devices to select and reselect relay devices by receiving messages from relay UEs that include information about their transmit power and measured receive signal power, allowing remote UEs to accurately determine sidelink pathloss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If relay UEs do not transmit transmit power information in discovery signals, then device complexity and message overhead are reduced, but pathloss measurement precision cannot be achieved
Solution Approach 1:
The relay UE performs preliminary action by including transmit power information in the discovery signal before the remote UE needs to calculate pathloss. This allows the remote UE to immediately calculate accurate pathloss values without requiring subsequent additional signaling exchanges, resolving the contradiction between measurement precision and device complexity.
Solution Approach 2:
The discovery signal acts as an intermediary carrier that transmits transmit power information from the relay UE to the remote UE. By embedding this information in the existing discovery signal structure, the patent avoids adding separate complex communication protocols while enabling accurate pathloss measurement.
2Measurement precision
If relay UEs transmit transmit power information in all discovery signals, then pathloss determination accuracy is improved, but signal transmission time and energy consumption increase
Solution Approach 1:
Instead of transmitting transmit power information in all discovery signals (excessive action), the patent applies partial action by including this information only when necessary for accurate pathloss calculation. This selective approach maintains measurement precision when needed while reducing unnecessary transmission time and energy consumption.
3Measurement precision
If remote UEs request transmit power information from relay UEs, then pathloss calculation accuracy is improved, but communication latency increases
Solution Approach 1:
The relay UE performs the action of including transmit power information in the discovery signal before the remote UE sends any requests. This preliminary inclusion of information eliminates the need for subsequent request-response exchanges, thereby reducing communication latency while maintaining accurate pathloss calculation.
Solution Approach 2:
The discovery signal inherently provides feedback information (transmit power levels) from the relay UE to the remote UE without requiring explicit requests. This feedback mechanism allows the remote UE to immediately calculate pathloss values, reducing the latency associated with traditional request-based information exchange.
Data Source
AI summary
Sidelink pathloss between a remote user equipment device (UE) and a relay UE may be determined based at least on transmit power information provided by the relay UE to the remote UE. The remote UE may receive, via a sidelink discovery signal from the relay UE, a message that includes first information representative of a transmit power of the relay UE and/or second information representative of a measured receive signal power of a sidelink solicitation signal previously transmitted by the remote UE and received by the relay UE. The remote UE may determine a sidelink pathloss between the remote UE and the relay UE based at least on the first information and/or the second information. The remote UE may select/reselect a relay UE based on corresponding pathlosses determined for the respective paths between the remote UE and different respective relay UEs.