Correlating Scheduling Assignment and Data Resources in D2D Communication
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently transmitting control information and data between User Equipments (UEs) due to half-duplex constraints, leading to reduced reception rates and increased complexity in resource allocation.
Innovation Solution
A method where a UE determines subframes for scheduling assignment (SA) transmission in an SA resource pool and transmits data via a resource indicated by a combination of information on the determined subframes and a time resource indication field, establishing a correlation between SA and data transmission to enhance reception rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If UE transmits SA and data in separate random resources without correlation, then resource allocation flexibility is improved, but reception rate decreases due to half-duplex constraints
Solution Approach 1:
The patent combines SA resource selection and data resource selection by establishing a correlation where the data resource is determined based on the selected SA resource. Specifically, the UE selects an SA resource from the SA resource pool, and then determines the data resource using the selected SA resource index combined with a time resource indication field value. This merging approach ensures that SA and data transmissions are coordinated in time, preventing the half-duplex constraint from blocking data reception when SA is transmitted, thereby improving reception rate while maintaining resource allocation flexibility.
2Productivity
If UE transmits SA and data in the same subframe, then transmission efficiency is improved, but transmission reliability decreases due to self-interference
Solution Approach 1:
The patent implements a dynamic resource allocation mechanism where the UE can flexibly choose to transmit SA and data in the same subframe or different subframes based on channel conditions and traffic requirements. The correlation between SA and data resources, established through the formula using SA resource index and time resource indication field, enables dynamic time-division multiplexing when needed, allowing the system to adapt between transmission efficiency and reliability requirements dynamically.
3Quantity of substance
If T-RPT bitmap size is reduced to fit within SA payload, then signaling overhead is reduced, but data transmission flexibility is limited
Solution Approach 1:
The patent segments the time resource indication into two parts: the first part is implicitly determined by the selected SA resource index, and the second part is explicitly indicated by the time resource indication field in the SA payload. This segmentation allows the T-RPT bitmap to be compact (reducing signaling overhead) while still providing flexible data resource selection capability. The implicit determination from SA resource index provides the base time resource information, and the explicit field provides additional flexibility for adjusting data transmission timing.
Data Source
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AI summary
An embodiment of the present invention provides a method for transmitting data and control information by a terminal in a wireless communication system, the method comprising the steps of: determining subframes in which a scheduling assignment (SA) is to be transmitted in an SA resource pool; and transmitting data by means of resources indicated by a combination of a time resource indication field and information related to the determined subframes.