UE Sidelink Allocation Across Independent Unlicensed RB Sets
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently transmitting sidelink signals in unlicensed bands due to the need for improved resource allocation methods that ensure reliable and low-latency communication, particularly in V2X scenarios like vehicle platooning, advanced driving, and remote driving, where direct UE-to-UE communication is required.
Innovation Solution
A method and apparatus for transmitting sidelink signals in an unlicensed band by allocating sub-channels of a predetermined size to non-overlapping resource block sets within a resource pool, using a sensing operation to select available frequency resources, ensuring that transmission only occurs when both adjacent resource block sets are in an idle state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sub-channels are allocated across multiple resource block sets in unlicensed band, then resource utilization increases, but transmission reliability decreases due to channel access conflicts
Solution Approach 1:
The unlicensed band resource pool is segmented into multiple independent resource block sets (first RB set, second RB set), each with its own sub-channels. This segmentation allows UEs to select resources from different independent sets, reducing conflicts while maintaining high utilization. The resource pool is divided such that each RB set contains non-overlapping resource blocks, and sub-channels are independently allocated within each set.
Solution Approach 2:
Different resource block sets are assigned with different sub-channel allocations and frequency offsets. The first RB set has sub-channels allocated with a first frequency offset, while the second RB set has sub-channels allocated with a second frequency offset. This local differentiation allows UEs to select resources based on local channel conditions and availability, improving both reliability and utilization.
2Reliability
If sensing operation is performed on all resource block sets, then transmission reliability improves, but latency increases
Solution Approach 1:
The UE performs sensing operation on a subset of resource block sets rather than all sets. Specifically, the UE selects resources from the first RB set and/or second RB set based on sensing results, but does not need to sense every possible RB set. This partial action approach maintains reliability by sensing critical sets while reducing latency by limiting the sensing scope.
Solution Approach 2:
The UE performs sensing operations in advance on resource block sets to identify available resources before actual transmission. The sensing results are used to pre-determine which RB sets and sub-channels are available for selection. This preliminary action ensures that when transmission is needed, the UE can quickly select from pre-identified available resources, reducing latency while maintaining reliability.
3Productivity
If sub-channel size is increased, then resource allocation efficiency improves, but flexibility in resource selection decreases
Solution Approach 1:
The resource pool is segmented into multiple resource block sets, each containing multiple resource blocks that can be independently allocated to form sub-channels. This segmentation allows the system to allocate larger sub-channels spanning multiple RB sets for efficiency, while still providing flexibility by allowing selection from multiple segmented units. Each RB set acts as an independent allocatable unit.
Solution Approach 2:
The patent introduces a new dimension of resource allocation by allocating sub-channels independently in each resource block set with different frequency offsets. Instead of a single linear allocation, the system now allocates across multiple dimensions (different RB sets, different frequency offsets), enabling both large efficient allocations and flexible selective combinations.
Data Source
AI summary
Disclosed are a method of transmitting a sidelink signal in an unlicensed band by a first UE in a wireless communication system for supporting sidelink communication and an apparatus therefor. The method includes receiving configuration information for a resource pool allocated for the unlicensed band, and transmitting the sidelink signal based on sub-channels included in the resource pool, wherein the sidelink signal includes at least one of a Physical Sidelink control Channel (PSCCH), a Physical Sidelink Shared Channel (PSSCH), or a Physical Sidelink Control Channel (PSFCH), and the unlicensed band includes a plurality of resource block sets, and the sub-channels are independently allocated for each of the plurality of resource block sets.