D2D HARQ-ACK Subframe Selection for Wireless Resource Scheduling
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Solution Overview
Problem
Existing wireless communication systems face challenges in effectively transmitting control information and managing resources for device-to-device (D2D) communication, particularly in scheduling and resource allocation.
Innovation Solution
A method for transmitting hybrid ARQ acknowledgement (HARQ-ACK) information by user equipment (UE) in a wireless communication system, where UE receives resource allocation information from a base station, receives D2D data, and transmits HARQ-ACK information in designated or closest subframes for D2D communication, optimizing resource use and scheduling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ-ACK information is transmitted in subframe #(n+k) when it corresponds to a D2D communication subframe, then resource allocation for D2D communication is maintained, but control information transmission is delayed or lost
Solution Approach 1:
The patent introduces an intermediary mechanism by identifying and selecting the closest alternative subframe from the D2D subframe set when the original HARQ-ACK transmission subframe conflicts with D2D communication. This intermediary subframe acts as a mediator that resolves the conflict between D2D resource allocation and control information transmission, ensuring both functions can operate effectively without direct interference.
Solution Approach 2:
The patent implements dynamic subframe selection for HARQ-ACK transmission. Instead of using a fixed subframe #(n+k), the system dynamically determines the transmission subframe based on whether it conflicts with D2D communication subframes. The UE adaptively selects the closest available subframe from the D2D subframe set, making the transmission timing flexible and responsive to actual resource allocation conditions.
2Adaptability or versatility
If resource allocation information is provided for the entire band, then frequency resource flexibility is improved, but the number of bits required increases
Solution Approach 1:
The patent segments the frequency resource allocation into two parts: first information indicating a first frequency resource region (partial allocation), and second information indicating a second frequency resource region within that first region (refined allocation). This segmentation allows the system to convey comprehensive resource allocation details while reducing the total number of bits required compared to specifying the entire band allocation in a single field.
Solution Approach 2:
The patent introduces a hierarchical dimension to frequency resource allocation by using multiple levels of information. The first information provides a broader frequency region context, while the second information refines the allocation within that region. This dimensional approach allows efficient representation of resource allocation with fewer bits than a flat, comprehensive specification would require.
Data Source
AI summary
The present invention relates to a wireless communication system. More specifically, the present invention relates to a method for performing a HARQ action and an apparatus for same, comprising the steps of: receiving from a base station resource allocation information which indicates a subframe set for D2D communication; receiving D2D data from a subframe #n from different user equipment; and receiving HARQ-ACK information with respect to the D2D data, wherein the HARQ-ACK information is transmitted from subframe #(n+k) when the subframe #(n+k) belongs to the subframe set for the D2D communication, and the HARQ-ACK is transmitted from a subframe that is closest to the subframe #(n+k) from among subframes belonging to the subframe set for the D2D communication after the subframe #(n+k), when the subframe #(n+k) does not belong to the subframe set for the D2D communication.