Sidelink Beam Management with Periodic CSI-RS Tracking
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Solution Overview
Problem
In high-frequency wireless communication systems like 5G, path loss and coverage limitations occur due to rapid movement of vehicle terminals, making beam management challenging for sidelink communication.
Innovation Solution
A method and apparatus for beam management in sidelink communication, involving periodic transmission of sidelink channel state information reference signals (SL CSI-RS) and reception of response messages for beam formation and acknowledgement, enabling quick and continuous beam tracking and recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If beamforming is used to decrease propagation loss and increase transmission distance, then coverage is improved, but beam management becomes challenging due to rapid terminal movement
Solution Approach 1:
The patent implements periodic transmission of SL CSI-RS signals and periodic reporting of beam management information between UEs. This periodic action allows the system to continuously update beam directions and maintain optimal coverage despite terminal movement, resolving the contradiction between extended coverage and beam management difficulty by creating regular opportunities for beam realignment.
Solution Approach 2:
The patent establishes a feedback mechanism where the second UE measures the SL CSI-RS signals and reports preferred beam information back to the first UE. This feedback loop enables dynamic beam adjustment in response to changing channel conditions caused by terminal movement, maintaining coverage effectiveness while managing beam direction challenges.
2Area of stationary object
If beamforming is applied to increase transmission distance, then coverage is extended, but reliability decreases due to difficulty in maintaining beam alignment during rapid movement
Solution Approach 1:
The patent performs preliminary beam alignment by having the first UE transmit SL CSI-RS signals before actual data transmission. The second UE measures these reference signals and determines preferred beam directions in advance, allowing the system to pre-establish reliable beam alignment before terminals move significantly, thus maintaining reliability over extended coverage distances.
Solution Approach 2:
The feedback mechanism continuously monitors beam quality through SL CSI-RS measurements and reports preferred beam information. This real-time feedback enables dynamic adjustment of beam directions to maintain alignment reliability even as terminals move rapidly, ensuring reliable communication over extended coverage areas.
3Productivity
If periodic SL CSI-RS transmission is implemented for beam tracking, then beam management efficiency is improved, but signaling overhead increases
Solution Approach 1:
The patent enables UEs to autonomously perform beam management functions by having the second UE independently measure SL CSI-RS signals and determine preferred beam directions without continuous network control. This self-service approach improves beam management efficiency by enabling faster local decisions while reducing signaling overhead compared to network-controlled beam management.
Solution Approach 2:
The patent allows flexible configuration of SL CSI-RS transmission parameters such as periodicity, bandwidth, and resource allocation. By optimizing these parameters based on specific deployment scenarios and mobility conditions, the system achieves efficient beam tracking while minimizing signaling overhead through parameter adaptation rather than fixed resource allocation.
Data Source
AI summary
The present disclosure relates to a 5th generation (5G) or pre-5G communication system for supporting a higher data transmission rate after a 4th generation (4G) communication system such as Long Term Evolution (LTE). Various embodiments of the present disclosure propose a method for performing beam operation in consideration of a communication environment in a sidelink. According to various embodiments of the present disclosure, by proposing a method for performing beam operation when sidelink communication operates at a high frequency, coverage may be improved. According to various embodiments of the present disclosure, an operating method of a first terminal in a wireless communication system is provided, the method comprising the steps of: establishing a connection with a second terminal; periodically transmitting a sidelink channel state information reference signal (SL CSI-RS) to the second terminal; receiving, from the second terminal, preferred beam information on the basis of the SL CSI-RS; transmitting a signal to the second terminal with a beam formed on the basis of the beam information; and receiving acknowledgement/not-acknowledgement (ACK/NACK) information for the signal from the second terminal.