Unlicensed-Spectrum Sidelink Resource Reservation for Collision Avoidance
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Solution Overview
Problem
Existing sidelink transmission protocols for unlicensed spectra lack effective methods for resource reservation, leading to potential resource collisions and reduced communication reliability due to limited signaling overhead and LBT failures.
Innovation Solution
Implement a method for sidelink transmission on unlicensed spectra that includes performing Listen Before Talk (LBT) and sending sidelink control information to indicate N transmission resources, where N is an integer greater than 3, and include a second period field and parameter field to reserve resources for multiple transport blocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional sidelink transmission protocols are used on unlicensed spectra, then the signaling overhead is limited and protocol complexity is low, but resource collisions occur frequently and communication reliability is reduced
Solution Approach 1:
The patent segments the resource reservation process into multiple independent components: LBT procedure segmentation (immediate LBT, deferred LBT, type 1 LBT, type 2 LBT), resource indication segmentation (multiple transport blocks with individual resource allocations), and transmission segmentation (separate handling of initial transmission and retransmission resources). This segmentation allows complex resource management to be achieved through modular, manageable units while maintaining overall system reliability.
Solution Approach 2:
The patent implements preliminary actions by performing LBT procedures before actual data transmission, reserving resources in advance through resource indication fields, and pre-configuring multiple transport blocks with their respective resources. The terminal device performs sensing and resource selection before transmission, ensuring that resources are ready and available, which prevents collisions and improves communication reliability.
2Reliability
If resource reservation for multiple transport blocks is implemented, then the likelihood of resource collisions is reduced, but the signaling overhead increases
Solution Approach 1:
The patent applies universality by designing the resource indication field to serve multiple functions simultaneously: it can indicate resources for multiple transport blocks, support both initial transmission and retransmission, and accommodate different LBT outcomes. The same signaling structure handles various scenarios (successful LBT, failed LBT, different transport block configurations) without requiring separate dedicated signals for each case, thus reducing overall signaling overhead while maintaining comprehensive resource reservation capability.
Solution Approach 2:
The patent utilizes parameter changes by dynamically adjusting the number of transport blocks (M) based on channel conditions and LBT outcomes, modifying the resource indication field parameters to match actual transmission needs, and changing the time-frequency resource allocation parameters according to reserved resource sets. This flexible parameter adjustment allows efficient use of signaling resources while ensuring adequate resource reservation for collision avoidance.
3Reliability
If LBT procedure is performed before transmission, then channel access compliance is achieved, but transmission delay increases
Solution Approach 1:
The patent implements periodic action through the configured periodic transmission resource sets, where resources are reserved at regular intervals defined by the resource indication field. The LBT procedure is performed periodically at each transmission opportunity, and the system alternates between sensing periods and transmission periods. This periodic structure ensures compliance with channel access requirements while maintaining predictable transmission timing and minimizing overall delay through efficient use of periodic resource opportunities.
Solution Approach 2:
The patent applies dynamics by making the LBT procedure adaptive - the system dynamically adjusts the LBT timing and type based on channel conditions, transport block status, and resource availability. The terminal device can switch between immediate LBT and deferred LBT, between type 1 and type 2 LBT, depending on the situation. This dynamic approach allows the system to minimize transmission delay when channel conditions permit while ensuring compliance when conditions require more thorough channel assessment.
Data Source
AI summary
The present disclosure relates to the technical field of communications, and disclosed are a resource reservation method and apparatus, a device and a storage medium. The method comprises: once LBT is successful, sending sidelink control information, wherein the sidelink control information is used to indicate N transmission resources reserved for a first transmission block, and the upper limit value of N is an integer greater than 3. Provided in the embodiments of the present application is a method for indicating transmission resources reserved by a terminal device when performing sidelink transmission on the basis of an unlicensed spectrum. Moreover, the sidelink control information sent by the terminal device may indicate more than three transmission resources, so that the reserved transmission resources may be indicated as much as possible in the sidelink control information.