ACK/NACK Resource Allocation for V2X Half-Duplex Conflicts
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Solution Overview
Problem
In wireless communication systems, particularly in V2X communication, the efficient transmission and reception of ACK/NACK signals are hindered by the half-duplex problem, where data and ACK/NACK resources often conflict, leading to issues with data reception and ACK/NACK transmission.
Innovation Solution
A method for determining the usage of specific radio resources for ACK/NACK transmission and reception in V2X communication, where the reception time of one ACK/NACK is set equal to the transmission time of another, allowing for the selection and reconfiguration of radio resources based on message priority and resource size, and potentially applying time hopping to mitigate the half-duplex problem.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the same radio resource is used for both data transmission and ACK/NACK transmission, then resource utilization is improved, but the half-duplex problem causes conflict between data reception and ACK/NACK transmission
Solution Approach 1:
The patent applies dynamics by making the radio resource allocation flexible and adaptive. The UE dynamically determines whether to transmit or receive ACK/NACK signals based on the resource usage status of the same time-frequency resource, switching between transmission and reception modes as needed to resolve half-duplex conflicts while maintaining high resource utilization.
Solution Approach 2:
The patent changes the parameter of resource usage status to resolve the contradiction. By monitoring whether the same radio resource is used for data transmission or ACK/NACK transmission, the system adjusts its behavior accordingly - transmitting ACK/NACK when the resource is free for reception, or receiving data when the resource is allocated for transmission, thus eliminating conflicts.
2Productivity
If the reception time of ACK/NACK is set equal to the transmission time of another ACK/NACK, then resource efficiency is improved, but the half-duplex constraint creates conflict
Solution Approach 1:
The UE performs self-service by autonomously determining its own operation mode (transmission or reception) based on the resource usage status. The UE monitors whether the same radio resource is allocated for data transmission or ACK/NACK transmission and independently decides its action, eliminating the need for complex external coordination and simplifying system operation.
Solution Approach 2:
The system dynamically adjusts the UE's operation mode based on real-time resource allocation. When the resource is marked for ACK/NACK transmission, the UE switches to reception mode; when the resource is marked for data transmission, the UE switches to transmission mode. This dynamic adaptation resolves half-duplex conflicts while maintaining resource efficiency.
3Device complexity
If radio resources are allocated without considering message priority, then allocation simplicity is maintained, but higher priority messages may experience unnecessary retransmissions
Solution Approach 1:
The patent implements feedback mechanisms where the UE monitors the resource usage status and adjusts its transmission behavior accordingly. The UE receives feedback about whether the resource is used for data transmission or ACK/NACK transmission and modifies its actions to avoid unnecessary retransmissions of high-priority messages, thereby improving reliability without significantly increasing complexity.
Solution Approach 2:
The system changes the parameter of message priority consideration in resource allocation decisions. By incorporating message priority information into the resource allocation process, the system can identify high-priority messages and adjust transmission strategies to prevent unnecessary retransmissions, improving reliability while maintaining manageable allocation complexity.
Data Source
AI summary
The present invention relates to a method and apparatus for transmitting and receiving an acknowledgement/negative-acknowledgement (ACK/NACK) by a terminal for vehicle-to-everything (V2X) communication in a wireless communication system. Particularly, the method comprises the steps of: receiving a configuration for a resource pool for V2X communication; for a particular wireless resource in a resource pool, when a reception time point of a first ACK/NACK and a transmission time of a second ACK/NACK have been simultaneously configured, determining a use of the particular wireless resource; and transmitting and receiving one ACK/NACK selected from the first ACK/NACK and the second ACK/NACK, on the basis of the use of the particular wireless resource. The UE is capable of communicating with at least one of another UE, a UE related to an autonomous driving vehicle, a base station or a network.