Sidelink Beam Measurement Using Multi-Beam CSI Requests
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
There is a need for effective beam management techniques in sidelink FR2 licensed bands, which are not currently standardized in 5G or 6G communication networks, to support enhanced communication services.
Innovation Solution
A method involving user equipment (UE) that transmits and receives channel state information (CSI) and reference signals through different transmission beams within a sidelink slot, determining an optimal transmission beam based on CSI reports, and performing communication using this beam after a preset time offset, with beam indication through Transmission Configuration Indication (TCI) states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam management techniques are implemented in sidelink FR2 licensed bands, then communication performance is improved, but system complexity increases due to lack of standardization
Solution Approach 1:
The patent applies universality by reusing existing 5G NR beam management techniques and signaling mechanisms for sidelink FR2 communication. The same CSI reporting frameworks, reference signal structures, and beam indication procedures used in uplink/downlink are adapted for sidelink use, allowing one set of standardized procedures to serve multiple communication scenarios without requiring entirely new protocols.
Solution Approach 2:
The patent implements preliminary action through the use of predefined TCI states and beam indication mechanisms. The transmitting UE indicates preferred TCI states to the receiving UE in advance, and the receiving UE prepares CSI reports based on pre-configured reference signals. This preliminary configuration reduces real-time decision complexity and enables faster beam management during actual communication.
2Measurement precision
If multiple reference signals are transmitted through different beams within one slot, then beam measurement accuracy is improved, but time resources are consumed
Solution Approach 1:
The patent applies periodic action by transmitting reference signals for beam measurement in a periodic or semi-periodic manner across different symbols within a slot. Multiple CSI-RS resources are configured with specific time offsets, allowing the receiving UE to measure different beams at different time instances. This structured periodic transmission ensures adequate measurement opportunities while maintaining efficient time resource utilization.
Solution Approach 2:
The patent segments the beam measurement process by dividing it into multiple independent CSI reporting instances, each associated with specific reference signal resources. Different CSI reports can be configured for different beam sets, allowing the system to perform comprehensive beam measurement across multiple directions without requiring all measurements to complete simultaneously, thus distributing time resource consumption.
3Measurement precision
If CSI reports include beam indexes and measurement information, then beam selection accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent applies local quality by configuring different CSI report types and granularity levels for different sidelink scenarios. For example, in some cases only the best beam index is reported, while in others both beam index and detailed measurement information (CQI, PMI, RI) are included. The reporting configuration is adapted locally to the specific communication requirements, channel conditions, and service types, optimizing the balance between selection accuracy and overhead.
Solution Approach 2:
The patent implements parameter changes by allowing dynamic adjustment of CSI reporting parameters such as report periodicity, included measurement quantities, and beam indexing formats. The system can modify these parameters based on traffic conditions, beam stability, and quality requirements, reducing overhead when full precision is not needed while maintaining high accuracy when required.
Data Source
AI summary
Disclosed are a method for beam measurement and procedures for a TX UE and an RX UE for beam change in a sidelink. The method of a first UE disclosed herein may include transmitting a CSI request requesting a second UE to report CSI, wherein the CSI request is transmitted to the second UE through a different transmission beam for each of symbols in which a reference signal for the beam measurement is transmitted in a single SL slot.