D2D Scheduling Assignment Resource Pattern Segmentation
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Solution Overview
Problem
Current device-to-device (D2D) communication systems face challenges in efficiently transmitting and receiving control information and scheduling assignment signals, particularly in managing resource patterns for transmission and handling varying numbers of subframes within a scheduling assignment period.
Innovation Solution
A method and apparatus for D2D communication where a user equipment (UE) receives a scheduling assignment including resource patterns for transmission (RPT), allowing the UE to determine whether to transmit a D2D signal in specific subframes, with provisions for repeating or partially using the RPT based on the number of subframes and bits, and receiving instructions for resource regions from a base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of bits in RPT is increased to cover more subframes, then the coverage of resource patterns is improved, but the overhead and complexity of control information increases
Solution Approach 1:
The RPT bits are segmented to correspond to specific subframe groups rather than individually addressing each subframe. This segmentation allows a smaller number of bits to control a larger number of subframes by grouping them, thereby reducing control information overhead while maintaining comprehensive coverage.
Solution Approach 2:
The patent introduces a hierarchical dimension to RPT bit allocation, where bits are allocated at different levels (e.g., subframe groups rather than individual subframes). This dimensional change in resource allocation strategy enables efficient coverage of many subframes using fewer bits, resolving the contradiction between adaptability and complexity.
2Adaptability or versatility
If the scheduling assignment period is extended to include more subframes, then the resource allocation flexibility is improved, but the difficulty of managing RPT bits increases
Solution Approach 1:
The scheduling assignment period is segmented into multiple subframe groups, each controlled by specific RPT bits. This segmentation approach allows the system to manage extended periods with many subframes by breaking them into manageable groups, reducing the complexity of RPT bit management while maintaining resource allocation flexibility.
Solution Approach 2:
The patent implements dynamic RPT bit allocation where the mapping between RPT bits and subframes can be adjusted based on the scheduling assignment period length. This dynamic adaptation allows the system to handle varying period lengths efficiently, maintaining flexibility while managing complexity through adaptive bit-subframe mapping.
3Measurement precision
If each bit of RPT indicates a single subframe, then the precision of resource indication is improved, but the efficiency of resource usage decreases when subframe number exceeds bit number
Solution Approach 1:
Multiple subframes are merged into groups that can be controlled by single RPT bits or small bit combinations. This merging approach maintains sufficient resource indication precision by treating groups as atomic units while dramatically improving resource usage efficiency when the number of subframes exceeds the number of available bits.
Solution Approach 2:
The patent transitions from a one-to-one mapping dimension (one bit per subframe) to a many-to-one mapping dimension (multiple subframes per bit). This dimensional change in the bit-subframe relationship enables efficient resource usage by allowing fewer bits to control more subframes, while maintaining precision through the structured grouping approach.
Data Source
AI summary
Disclosed is a method for transmission and reception of a device-to-device (D2D) signal by a terminal in a wireless communication system. The method for transmission and reception of a D2D signal, according to an embodiment of the present invention, comprises the steps of: receiving a scheduling assignment comprising a resources pattern for transmission (RPT); and receiving a D2D signal in a subframe indicated in the RPT, wherein each bit of the RPT indicates whether or not the D2D signal is permitted to be transmitted in the subframe within a scheduling assignment period, and wherein, if the number of the subframes comprised in the scheduling assignment period is greater than the number of the bits of the RPT, at least one bit of the RPT indicates whether or not the D2D signal is permitted to be transmitted in two or more subframes.