Sidelink Resource Allocation Without Repeated PSCCH Transmission
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Solution Overview
Problem
In sidelink transmission of 3GPP Release 12, a UE cannot receive scheduling assignment information (SCI format 0) from another UE during its own transmission due to high-power interference, leading to failures in data reception.
Innovation Solution
Implementing a mechanism where a transmitting terminal transmits sidelink control information with an indication of valid resource allocation periods, allowing the receiving terminal to utilize previously transmitted control information for subsequent periods, reducing the need for repeated transmissions and collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a UE transmits sidelink control information frequently to ensure reliable data transmission, then data transmission reliability is improved, but interference to the UE's own reception increases due to high-power self-interference
Solution Approach 1:
The resource pool is segmented into separate first resource pools for control information transmission and second resource pools for data transmission. This spatial and functional segmentation allows the UE to transmit control information in one resource pool while receiving data in another, avoiding self-interference and improving both reliability and reception quality.
2Reliability
If sidelink control information is transmitted in every control period, then reception reliability is improved, but resource waste occurs when the UE cannot receive due to self-interference
Solution Approach 1:
Control information is transmitted periodically in first resource pools rather than continuously. The periodic transmission allows the UE to have dedicated reception periods in second resource pools without self-interference, optimizing the balance between reliability and resource efficiency by transmitting only when necessary.
Solution Approach 2:
By separating control and data resource pools, the system enables the UE to transmit control information in first resource pools and receive in second resource pools during the same or overlapping time periods, eliminating the waste of transmission resources when reception is blocked by self-interference.
3Productivity
If control and data transmissions use the same resource pool, then resource utilization is improved, but reception failure occurs due to high-power interference during simultaneous transmission
Solution Approach 1:
The resource pool is divided into first resource pools for control information and second resource pools for data transmission. This segmentation allows simultaneous transmission and reception operations to occur in separated resources, maintaining high resource utilization while preventing reception failures caused by self-interference.
Data Source
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AI summary
The invention is directed to a method for a wireless terminal and a wireless terminal. The method comprises keeping resource allocation for data transmission effective after a sidelink control period and performing the data transmission on a Physical Sidelink Shared Channel, PSSCH, without transmitting a Physical Sidelink Control Channel, PSCCH. The wireless terminal comprises means for keeping resource allocation for data transmission effective after a sidelink control period; and means for performing the data transmission on a Physical Sidelink Shared Channel, PSSCH, without transmitting a Physical Sidelink Control Channel, PSCCH.