Sidelink Resource Mapping for Frequency Diversity
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Solution Overview
Problem
Existing wireless communication systems face challenges in ensuring reliable sidelink communication, particularly due to interference and reduced frequency diversity resulting from contiguous resource allocation in sidelink channels.
Innovation Solution
The method involves mapping communication resources allocated for sidelink control and data channels from a logical domain to a physical domain, increasing frequency diversity by expanding the bandwidth of sidelink control channels and allowing for greater frequency ranges. Additionally, the technique includes repeating sidelink communications within a contention-based resource pool to enhance reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If contiguous resource allocation is used for sidelink channels, then resource allocation simplicity is improved, but frequency diversity is reduced and interference increases
Solution Approach 1:
The patent segments the frequency resources for sidelink control channels by introducing non-contiguous resource allocation patterns. Instead of allocating contiguous frequency resources, the system divides resources into multiple separate frequency blocks, thereby increasing frequency diversity while maintaining allocation simplicity through predefined patterns.
Solution Approach 2:
The patent introduces a new dimension to resource allocation by adding frequency hopping across multiple slots. This transforms the allocation from a single contiguous block in one slot to distributed resources across multiple frequency slots, thereby enhancing frequency diversity without significantly complicating the allocation mechanism.
2Reliability
If bandwidth of sidelink control channel is increased, then frequency diversity is improved, but resource overhead increases
Solution Approach 1:
The patent employs periodic frequency hopping where the sidelink control channel bandwidth is expanded across multiple time slots in a periodic manner. This allows the system to achieve enhanced frequency diversity through time-varying bandwidth utilization while maintaining efficient resource usage by cycling through predefined frequency patterns rather than continuously occupying maximum bandwidth.
3Reliability
If resource mapping is performed from logical to physical domain, then frequency diversity is increased, but mapping complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring the logical-to-physical resource mapping tables and frequency hopping patterns before actual sidelink communication occurs. This allows the UE to simply look up pre-computed mapping relationships rather than performing complex real-time calculations, thereby achieving enhanced frequency diversity through pre-planned resource distribution while minimizing runtime complexity.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described for improving sidelink communication reliability. In some examples, a user equipment (UE) may map allocated sidelink resources from a logical domain to a physical domain, where the mapped resources may include greater frequency diversity in the physical domain A frequency range of a sidelink control channel or of a sidelink data channel may be greater in the physical domain than in the logical domain after the mapping. In some examples, sidelink communications may be associated with an aggregation factor that represents a number of repetitions of a sidelink communication. In this example, a UE may repeat a sidelink communication within a contention-based resource pool a number of times before receiving feedback in order to increase communication reliability. A first UE may communicate a sidelink communication with a second UE using a resource mapping or repetitions of the sidelink communication.