User Equipment Transmit Power Control for Sidelink
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Solution Overview
Problem
Current sidelink communication systems face challenges in managing transmission power effectively for unicast and groupcast communications, leading to interference issues and sub-optimal performance due to limitations in power control mechanisms, especially in scenarios where channel measurement reports are delayed or inaccurate, and the existing power control mechanism is not applicable for connectionless groupcast communications.
Innovation Solution
A method where user equipment directly indicates its transmit power using two-part power representation, dividing the power range into large-scale and small-scale granular scales, allowing for more accurate and flexible power control, reducing signaling overhead, and enabling immediate adaptation to changing wireless channel conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the existing SL power control mechanism is used where Rx-UE feeds back channel measurement reports to Tx-UE, then power control can be implemented for SL unicast communication, but the signaling overhead becomes overwhelmingly significant when extended to SL groupcast communication requiring individual RRC connections for every Tx-Rx UE pair
Solution Approach 1:
The Tx-UE autonomously determines its transmit power without requiring channel measurement feedback from Rx-UEs. The transmitting side independently controls its own power based on pre-configured parameters and pathloss compensation, eliminating the need for complex feedback signaling mechanisms.
Solution Approach 2:
The feedback mechanism is extracted and removed from the system. Instead of requiring Rx-UEs to send channel measurement reports, the power control function is simplified to only require the Tx-UE to autonomously determine power based on pre-configured parameters, significantly reducing signaling overhead.
2Reliability
If channel measurement reports are exchanged between Rx-UE and Tx-UE, then power adaptation can be achieved, but delay in exchanging reports leads to slow adaptation to fast changing wireless channel conditions
Solution Approach 1:
All necessary power control parameters including pathloss compensation factors and target received power levels are pre-configured before communication begins. The Tx-UE has all the information needed to autonomously determine transmit power in advance, enabling immediate power adaptation without waiting for feedback reports.
3Adaptability or versatility
If Rx-UE determines feedback transmission power without knowing Tx-UE's output power, then connectionless groupcast can operate, but Rx-UE risks creating interference by transmitting excessive power or failing to transmit sufficient power
Solution Approach 1:
The system provides implicit feedback by having the Tx-UE indicate its transmit power level to Rx-UEs through pre-configured signaling. This allows Rx-UEs to determine appropriate feedback transmission power levels without requiring complex negotiation, enabling connectionless groupcast while controlling interference through predetermined power relationships.
Data Source
AI summary
A user equipment and a method of wireless communication of same are provided. The method includes representing a transmit (Tx) power for the user equipment, wherein the representation of the Tx power for the user equipment provides a division of a range of output power for the user equipment into different granular scales of power information.