Sidelink Control Element Filtering for Multi-Carrier Identification
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Solution Overview
Problem
In sidelink communication scenarios, when multi-carrier communication is considered, the current method for determining carrier information in sidelink medium access control elements (SL MAC CEs) leads to ambiguity, causing information indication errors and reduced communication quality due to the inability of reception ends to determine the correct carrier for the SL MAC CEs.
Innovation Solution
The method involves determining sidelink control elements based on carrier information, ensuring that these elements participate in the logical channel prioritization process, thereby allowing the reception end to accurately identify the carrier corresponding to the SL MAC CEs, reducing indication errors and improving communication quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multi-carrier communication is considered in SL scenario using current method, then communication capacity is improved, but carrier identification accuracy deteriorates because reception end cannot determine the correct carrier for SL MAC CEs
Solution Approach 1:
The patent segments the SL MAC CE structure by introducing a dedicated carrier indicator field that divides the control element into identification portions (carrier indicator) and data portions. This segmentation allows the reception end to separately extract carrier identification information, resolving the ambiguity in multi-carrier scenarios while maintaining communication capacity.
Solution Approach 2:
The patent introduces a carrier indicator field as an intermediary element within the SL MAC CE structure. This intermediary explicitly carries carrier identification information, acting as a mediator between the transmitted SL MAC CE and the reception end's carrier determination process, thereby enabling accurate carrier identification without compromising communication efficiency.
2Loss of energy
If SL MAC CEs are transmitted without carrier-specific indication, then transmission overhead is reduced, but information indication accuracy deteriorates leading to communication quality reduction
Solution Approach 1:
The patent applies local quality by making the SL MAC CE structure adaptive to different carriers through the carrier indicator field. Rather than using a uniform structure that lacks carrier specificity or a completely separate structure for each carrier, the patent locally enhances the MAC CE with carrier identification information only where needed, maintaining efficiency while improving accuracy.
Solution Approach 2:
The patent changes the structural parameters of the SL MAC CE by dynamically including carrier indicator information based on multi-carrier operation requirements. When multi-carrier communication is active, the MAC CE structure is modified to include the carrier indicator field; when single-carrier operation is sufficient, the structure remains simpler, thus balancing overhead and accuracy.
Data Source
AI summary
This application relates to a communication method, apparatus, and system. A first terminal device determines at least one sidelink control element based on carrier information. The first terminal device determines a first destination address based on the at least one sidelink control element, and then determines a first logical channel and/or a first sidelink control element based on the first destination address. In embodiments of this application, a part of sidelink control elements are selected from a to-be-sent sidelink control element based on the carrier information, and the selected sidelink control elements may participate in an SL LCP process. Due to the screening process, the finally determined first sidelink control element is probably a sidelink control element determined based on the carrier information, so that a reception end can determine a carrier corresponding to the first sidelink control element, thereby improving sidelink communication quality.