Sidelink CSI-RS Bandwidth Matching for Sub-Channel Resource Allocation
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Solution Overview
Problem
Existing CSI solutions for sidelink (SL) communication do not meet the SL communication requirements, as they are not suitable for sub-band granularity and limit resource allocation based on CSI, leading to inadequate communication capacity and reliability.
Innovation Solution
A method and apparatus that send a CSI-RS with a frequency-domain bandwidth matching the resource pool, allowing for CSI measurement and feedback of each sub-channel, enabling proper resource selection and improving communication capacity and reliability in SL scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the frequency-domain bandwidth of CSI-RS is limited to match only the associated PSSCH bandwidth, then the measurement and calculation of CSI can be performed, but the transmit end cannot obtain CSI for the entire resource pool, limiting resource allocation flexibility and communication capacity
Solution Approach 1:
The resource pool is divided into multiple sub-channels in the frequency domain, and CSI-RS is configured for each sub-channel independently. This segmentation allows the receive end to measure and feedback CSI for each sub-channel separately, enabling the transmit end to allocate resources flexibly across the entire resource pool based on detailed per-sub-channel CSI information.
Solution Approach 2:
The patent extends the CSI measurement dimension from a single bandwidth (PSSCH) to multiple bandwidths (entire resource pool) by introducing frequency-domain segmentation. This dimensional expansion allows CSI to be obtained across the full frequency range of the resource pool, not just the limited PSSCH bandwidth.
2Measurement precision
If CSI measurement is performed at sub-band granularity, then frequency-selective resource allocation can be achieved, but the concept of sub-band is not introduced for sidelink, making the Uu interface CSI solution unsuitable for SL
Solution Approach 1:
The patent applies local quality by configuring CSI-RS resources with specific frequency-domain positions and bandwidths that correspond to different sub-channels within the resource pool. This allows precise CSI measurement at the sub-channel level, providing localized channel quality information for each frequency segment, enabling fine-grained resource allocation decisions.
3Quantity of substance
If the frequency-domain bandwidth of CSI-RS is restricted, then signaling overhead can be reduced, but the transmit end cannot properly select frequency domain resources based on comprehensive CSI
Solution Approach 1:
The patent dynamically configures the frequency-domain bandwidth and position of CSI-RS resources based on the resource pool configuration. The CSI-RS bandwidth is set to match the resource pool bandwidth, and the position is aligned with the resource pool's starting PRB. This dynamic configuration ensures that CSI measurement coverage matches the actual resource allocation scope, maximizing communication capacity while adapting to different scenario requirements.
Data Source
AI summary
A system and method includes: sending a channel state information-reference signal CSI-RS to a second terminal device, where a frequency-domain bandwidth of the CSI-RS is the same as a frequency-domain bandwidth of a resource pool, the resource pool is a time-frequency resource set included in a sidelink SL bandwidth part BWP, the resource pool includes one or more consecutive sub-channels in frequency domain, one sub-channel in the resource pool includes one or more consecutive physical resource blocks PRBs, and the resource pool is determined based on a periodic bitmap in time domain. According to the method and apparatus in the embodiments of this application, a first terminal device can obtain channel state information CSI of each sub-channel in the resource pool, and allocate a resource based on the CSI of each sub-channel in the resource pool, improving a communication capacity in an SL scenario.