Sidelink Resource Selection for Half-Duplex Mitigation
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Solution Overview
Problem
The half duplex problem in wireless communication systems, where user equipment (UE) cannot simultaneously transmit and receive, leading to errors and reduced reliability in sidelink communications, particularly in device-to-device (D2D) and vehicle-to-everything (V2X) communications.
Innovation Solution
A method for a UE to identify the transmission time interval (TTI) used by a neighboring UE and selectively exclude certain resources for transmission, allowing it to transmit a sidelink signal on alternative resources, thereby mitigating the half duplex issue and enhancing error resilience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a UE transmits a sidelink signal, then the transmission reliability is improved, but the UE cannot simultaneously receive signals from other UEs due to half duplex constraint
Solution Approach 1:
The resource pool is segmented into multiple resource sets, where each resource set contains resources with specific time-frequency characteristics. The UE selectively transmits on resources from one resource set while monitoring for transmissions from other UEs on different resource sets, thereby dividing the communication resources to avoid half-duplex conflicts and improve overall system capacity.
2Reliability
If a UE monitors transmissions from neighboring UEs to avoid half duplex conflicts, then the error rate is reduced, but the complexity of resource selection increases
Solution Approach 1:
The UE performs preliminary sensing and identification of transmissions from neighboring UEs before selecting resources for its own transmissions. By identifying occupied resources in advance and excluding them from the selection pool, the UE avoids half-duplex conflicts and reduces error rates without requiring complex real-time decision-making during transmission.
3Reliability
If the UE excludes resources based on neighboring UE transmissions, then the half duplex problem is solved, but the available resources for transmission are reduced
Solution Approach 1:
The patent introduces an additional dimension of resource organization by creating multiple resource sets with different time-frequency characteristics. When resources in one resource set are excluded due to neighboring UE transmissions, the UE can still utilize resources from other resource sets, effectively adding a dimensional perspective to resource selection that expands the available transmission opportunities while maintaining half-duplex compliance.
Data Source
Figure 1(a)~1(b)
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AI summary
One aspect of the present disclosure provides a method for transmitting and receiving a sidelink signal by a first user equipment (UE) in a wireless communication system, the method comprising: identifying a transmission time interval (TTI) used for transmission by a second UE; determining a resource to be excluded in selecting a resource to be used for transmission by the first UE, based on the identified TTI; selecting a resource to be used for transmission by the first UE from resources other than the excluded resource; and transmitting a sidelink signal on the selected resource.