Multi-Antenna V2V Sidelink Power Control via Dual Pathloss
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Solution Overview
Problem
Current wireless communication systems, particularly in pre-5G networks, face challenges in efficiently managing power control and channel measurements for sidelink communications between user equipment (UEs) in vehicle-to-vehicle (V2V) scenarios, leading to suboptimal data transmission and reliability.
Innovation Solution
The implementation of multi-antenna transmission schemes, such as MIMO, and advanced channel measurement techniques, including the use of sidelink reference signals, to enable precise power control and data transmission on sidelinks between UEs, enhancing data throughput and reliability in V2V communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-antenna transmission schemes (MIMO) are implemented, then data transmission rates are improved, but device complexity increases
Solution Approach 1:
The patent segments the transmission process by separating downlink channel measurements (from base station to UE) from sidelink channel measurements (between UEs). The UE independently calculates pathloss for both links using separate reference signals (downlink RS and sidelink RS), enabling MIMO transmission on sidelink while maintaining manageable device complexity through modular measurement and calculation approaches.
2Measurement precision
If advanced channel measurement techniques are used, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The UE autonomously performs channel measurements using downlink reference signals from the base station and sidelink reference signals from other UEs. The UE independently calculates pathloss values for both downlink and sidelink channels without requiring complex network coordination, thereby achieving high measurement precision while maintaining ease of operation through self-contained measurement procedures.
3Reliability
If pathloss-based power control is implemented for sidelink, then reliability is improved, but device complexity increases
Solution Approach 1:
The base station pre-configures the UE with pathloss calculation parameters and reference signal configurations before sidelink transmission begins. The UE performs pathloss calculations based on these pre-configured parameters, enabling reliable power control for sidelink communications while reducing device complexity by avoiding real-time complex coordination with the base station during actual transmission.
Data Source
AI summary
A method of a user equipment (UE) in a wireless communication system is provided. The method comprises: receiving, from a base station (BS), configuration information for a power control of a sidelink and a downlink reference signal (RS) to measure a downlink channel from the BS, wherein the sidelink is established between the UE and another UE; receiving, from the BS, the downlink RS based on the configuration information; calculating a first pathloss for the downlink channel between the UE and the BS based on the configuration information; identifying a second pathloss for the sidelink between the UE and the other UE; and transmitting, to the other UE, a physical sidelink shared channel (PSSCH) and a physical sidelink control channel (PSCCH) based on the first pathloss and the second pathloss.