V2X Retransmission Resource Determination via Dynamic Intervals
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Solution Overview
Problem
In V2X communication within the new radio (NR) system, the existing retransmission resource configuration methods in LTE systems result in low transmission flexibility and high overheads, as they do not effectively manage multiple retransmissions of a single transport block (TB) across different time and frequency domains.
Innovation Solution
A method where a terminal device determines an initial time interval and an interval difference to calculate the time domain position of a time-frequency resource for each retransmission of a TB, allowing for varied time and frequency domain positions across multiple transmissions, thereby reducing overheads and enhancing flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a same time domain interval is configured for each retransmission according to LTE V2X method, then transmission overheads are reduced, but transmission flexibility is low
Solution Approach 1:
The patent applies dynamics by making the time domain interval variable rather than fixed. The network device dynamically determines different time domain intervals for different retransmissions based on transmission conditions, allowing the system to adapt to varying requirements while maintaining manageable overhead through centralized control.
Solution Approach 2:
The patent changes the parameter of time domain interval from a constant value to a variable value that can be adjusted based on transmission needs. By allowing the interval to change across different retransmissions, the system achieves higher flexibility without requiring excessive configuration overhead.
2Adaptability or versatility
If time domain position is reconfigured for each retransmission, then transmission flexibility is improved, but transmission overheads increase
Solution Approach 1:
The patent applies self-service by enabling the terminal device to autonomously determine retransmission time domain positions based on initially provided interval information. The terminal calculates appropriate intervals and positions independently without requiring continuous network signaling, thus achieving flexibility while reducing overhead.
Solution Approach 2:
The patent uses preliminary action by having the network device provide initial time domain interval information before retransmissions occur. The terminal then uses this preliminary information to determine subsequent retransmission positions, avoiding the need for real-time reconfiguration signaling.
3Reliability
If multiple retransmissions are supported with varied time and frequency positions, then transmission reliability is improved, but resource management complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the resource allocation into distinct components: the network device handles high-level interval configuration while the terminal device manages specific time domain position calculations. This segmentation of responsibilities simplifies overall resource management complexity while enabling reliable multi-retransmission support.
Data Source
AI summary
A data transmission resource determining method includes determining an initial time interval and an interval difference, and determining, based on a initial time interval and a interval difference, a time domain position of a first time-frequency resource in response to the first TB being transmitted for an ith time, where i is a positive integer, and 2≤i≤Rmax+1. The initial time interval is between a time domain position at which a first transport block (TB) is transmitted for the first time and the second time. The interval difference is a difference between a first and a second time interval. The first time interval is between a corresponding time domain position at which the first TB is transmitted for a kth h time and (k+1)th time. The second time interval is between a corresponding time domain position at which the first TB is transmitted for the (k+1)th time and (k+2)th time.