Sidelink Resource Indication Using Start and Length Information
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Solution Overview
Problem
In Device-to-Device (D2D) communication, the existing gap subframe bitmap design requires each bit to correspond to a unique subframe, leading to excessive overheads in resource indication.
Innovation Solution
The proposed method determines the transmit or receive time resource of a sidelink signal using a few bits, eliminating the need to individually indicate each subframe, by employing start information and length information to define a time resource that encompasses multiple subframes, thereby reducing overheads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If each bit in the gap subframe bitmap corresponds to a unique subframe, then the subframe indication is precise, but the overhead is excessive
Solution Approach 1:
The patent segments the time resource indication into two parts: a first time resource indicated by the gap subframe bitmap and a second time resource indicated by the time offset. This segmentation allows precise indication of multiple subframes without requiring a separate bit for each subframe, thereby reducing overhead while maintaining precision.
Solution Approach 2:
The patent introduces a time offset dimension to extend the indication from a single bitmap-based time resource to a multi-dimensional time resource specification. By adding the time offset parameter, the system can indicate multiple subframes (first time resource plus offset) without proportionally increasing the bitmap size, thus reducing overhead while maintaining precision.
2Manufacturing precision
If a gap subframe bitmap is used to indicate transmit or receive time resources, then the resource allocation is precise, but the signaling overhead is large
Solution Approach 1:
The patent segments the resource allocation indication into a base time resource (from gap subframe bitmap) and an offset resource (from time offset parameter). This segmentation enables precise resource allocation while reducing the total number of bits required compared to indicating each resource individually through the bitmap.
Solution Approach 2:
By introducing the time offset as an additional dimension, the patent extends the resource allocation capability beyond what the bitmap alone can provide. This dimensional extension allows the system to indicate multiple subframes efficiently, reducing signaling overhead while maintaining allocation precision.
3Measurement precision
If detailed bit-by-bit subframe indication is used, then the resource control is accurate, but the complexity of the indication increases
Solution Approach 1:
The patent divides the indication process into two simpler steps: first determining the base time resource from the gap subframe bitmap, then applying the time offset to get the complete resource indication. This segmentation reduces the complexity of processing compared to evaluating each bit individually for detailed subframe indication.
Solution Approach 2:
By adding the time offset dimension, the patent simplifies the overall indication structure. Instead of requiring complex bit-by-bit evaluation for each subframe, the system uses a more straightforward two-step process that reduces computational complexity while maintaining control accuracy.
Data Source
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AI summary
This application provides a terminal communication method and a communications device. The method includes: obtaining, by a communications device, start information and length information, where the start information is used to indicate a start location of a first time resource; and determining the first time resource based on the start information and the length information, where the first time resource is used to indicate a transmit or receive time resource of a sidelink signal. This implements that the transmit or receive time resource of the sidelink signal may be determined by using a few bits, and there is no need to determine, one by one based on a value of a bit string, whether each subframe belongs to the first time resource. Therefore, overheads are greatly reduced.