NR V2X SCI Resource Indication via Combined Position Encoding
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Solution Overview
Problem
In NR V2X communication, transmitting User Equipments (UEs) face challenges in efficiently transmitting information about multiple sidelink transmissions on a single Sidelink Control Information (SCI), leading to increased payload size and resource allocation complexities.
Innovation Solution
The method involves transmitting a sidelink control information (SCI) through a first physical sidelink control channel (PSCCH) or a first physical sidelink shared channel (PSSCH), which includes combination information related to the location of multiple sidelink resources and information about the relative position of resources for data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If transmitting UE transmits information about multiple sidelink resources separately, then resource allocation accuracy is improved, but payload size increases
Solution Approach 1:
The patent combines information about multiple sidelink resources into a single SCI message. Specifically, it uses a resource indication value (RIV) to jointly encode the start position and length of multiple contiguous resources, and employs a single time domain resource assignment (TDRA) index to point to a pre-configured table entry that contains multiple resource parameters. This merging approach maintains resource allocation accuracy while significantly reducing the payload size compared to transmitting each resource separately.
Solution Approach 2:
The patent creates a universal resource indication mechanism that can handle multiple different resource configurations through a single SCI structure. The TDRA index serves multiple functions by pointing to different entries in a pre-configured table, each entry representing a different combination of time domain resources. This multi-functional approach allows one SCI message to efficiently indicate various resource patterns without requiring separate dedicated fields for each resource type.
2Measurement precision
If transmitting UE includes detailed resource location information for multiple sidelink resources, then resource identification precision is improved, but device complexity increases
Solution Approach 1:
The patent employs preliminary action by pre-configuring a TDRA table that contains multiple resource parameter combinations before actual sidelink transmission. The receiving UE also has this same pre-configured table. During transmission, the transmitting UE only needs to send a compact TDRA index that points to the appropriate pre-configured entry, rather than transmitting all resource details. This preliminary configuration significantly reduces the complexity of resource indication while maintaining precise resource identification, as both UEs already have the detailed resource information prepared in advance.
3Reliability
If SCI includes comprehensive information about all sidelink resources, then communication reliability is improved, but overhead increases
Solution Approach 1:
The patent uses a copying approach where the detailed resource information is not transmitted repeatedly in each SCI message. Instead, a compact TDRA index is transmitted, which serves as a reference or copy key to the pre-configured TDRA table. The receiving UE uses this index to retrieve the corresponding resource information from its local copy of the TDRA table. This copying mechanism ensures that comprehensive resource information is available for reliable communication while minimizing the overhead in the actual transmitted SCI message.
Data Source
AI summary
Proposed is a method for a first device to perform wireless communication. The method may include a step for transmitting sidelink control information (SCI) to a second device through a first physical sidelink control channel (PSCCH) or a first physical sidelink shared channel (PSSCH) related to the first PSCCH, and transmitting data to the second device through the first PSSCH related to the first PSCCH. For example, the SCI may include combination information related to the positions of a plurality of sidelink (SL) resources, and information related to the relative position of a resource on which the first PSSCH is transmitted among the plurality of SL resources.