Shifting WAN Uplink Timing for D2D Coexistence
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing device-to-device (D2D) signals within the same time frame as wide area network (WAN) signals, leading to potential interference and reduced performance in WAN communication due to complex scheduling requirements and limited resource allocation.
Innovation Solution
A method is introduced where a user equipment (UE) configures its uplink resources to transmit WAN signals by shifting the WAN uplink transmission timing using third radio resources, allowing for efficient coexistence of D2D and WAN communications by separating resources in the time domain and adjusting HARQ processes to prioritize WAN performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If uplink resources are allocated for both WAN and D2D signals in the same time frame, then resource utilization is improved, but interference between WAN and D2D signals increases
Solution Approach 1:
The patent segments the uplink resources into different sets: first uplink resources for WAN signals and second uplink resources for D2D signals. This temporal segmentation allows both signal types to coexist without interference while maintaining efficient resource utilization across the entire time frame.
Solution Approach 2:
The patent introduces a third dimension by using downlink resources to carry uplink HARQ-ACK information. This allows the system to resolve the time-domain conflict by moving the acknowledgment signal to a different dimension (downlink channel), enabling simultaneous WAN and D2D operations without mutual interference.
2Reliability
If HARQ processes are adjusted to shift WAN uplink transmission timing, then WAN communication performance is improved, but transmission delay increases
Solution Approach 1:
The patent dynamically adjusts HARQ process timing based on resource allocation. When second uplink resources are designated for D2D signals, the system dynamically shifts WAN HARQ-ACK transmission to the third downlink resource, creating a flexible timing mechanism that adapts to different signal conditions while maintaining WAN performance.
Solution Approach 2:
The patent uses the downlink resource as an intermediary carrier for uplink HARQ-ACK information. This intermediary approach allows timing flexibility by routing acknowledgment signals through the downlink channel, resolving conflicts between immediate acknowledgment needs and D2D signal allocation requirements.
Data Source
AI summary
The present invention relates to a method and an apparatus for transmitting an acknowledgment/negative-acknowledgement (ACK/NACK) of a terminal in a wireless communication system. More specifically, the method comprises the steps of: receiving a wide area network (WAN)-based downlink signal; and transmitting the ACK/NACK in accordance with first hybrid automatic repeat request (HARQ) processes, based on third wireless resources except for at least one second wireless resource for device-to-device (D2D) among first wireless resources for WAN communication, wherein the HARQ processes are characterized in that WAN uplink transmission timing on the second wireless resource is set up to be shifted to the third wireless resource.