V2X Signal Resource Mapping for AGC Settling
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Solution Overview
Problem
In wireless communication systems, the use of both legacy and short transmission time intervals (TTIs) for V2X communication leads to issues with automatic gain control (AGC) settling, resulting in poor reception of signals using the legacy TTI due to additional time required for AGC settling.
Innovation Solution
A method where V2X data is mapped to a resource area excluding error symbols used for AGC, allowing for rate matching and puncturing to ensure proper reception of both legacy and short TTI signals, with additional data transmission through error symbols when AGC time is less than a specific value.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If both legacy TTI and short TTI signals are transmitted using frequency division multiplexing, then the system supports multiple TTI formats for V2X communication, but the receiving terminal experiences additional AGC settling time which degrades reception quality of legacy TTI signals
Solution Approach 1:
The patent segments the resource area for legacy TTI into multiple parts: a first resource area for data transmission and a second resource area (error symbol) reserved for AGC settling. This segmentation allows the receiving terminal to perform AGC settling during the second resource area without affecting the reception of legacy TTI signals in the first resource area, thus resolving the contradiction between supporting multiple TTI formats and maintaining reception quality
Solution Approach 2:
The patent applies preliminary action by reserving the second resource area in advance for AGC settling operations. The transmitting terminal intentionally creates this error symbol region where no data is transmitted, allowing the receiving terminal to complete AGC settling before receiving the actual data in the first resource area. This preliminary AGC settling ensures that subsequent legacy TTI signal reception is not degraded by power changes from short TTI signals
2Reliability
If the error symbol is excluded from data mapping, then legacy TTI signal reception is improved by providing AGC settling time, but the available resource elements for data transmission are reduced
Solution Approach 1:
The patent compensates for the loss of resource elements in the time dimension by extending the transmission time. The first resource area uses N symbols for data transmission, and the second resource area uses M symbols for AGC settling. By utilizing the time dimension effectively, the system maintains data transmission capacity while ensuring reliable legacy TTI reception through proper AGC settling
3Reliability
If additional AGC settling time is allocated, then reception quality of legacy TTI signals is improved, but the transmission time interval is extended
Solution Approach 1:
The patent applies local quality by making the resource allocation adaptive to the specific reception needs of different terminal types. The system configures different resource area allocations based on whether the terminal receives only legacy TTI, only short TTI, or both types. This localized optimization ensures that AGC settling time is allocated only where necessary, minimizing the impact on transmission time while maintaining reception quality for terminals that require it
Data Source
AI summary
Provided are a method for a first terminal transmitting signals for V2X communication in a wireless communication system and a terminal using the method. The method comprises: mapping V2X data in a first resource area including an N (N is a natural number) number of symbols in a time dimension; and transmitting the V2X data which has been mapped, wherein when an M (M is a natural number smaller than N) number of symbols are included in the time dimension and a second terminal transmits a signal in a frequency division-multiplexed second area to the first resource area, resource elements in the first resource area in an error symbol are excluded from the mapping step, wherein the error symbol is positioned immediately after the M number of symbols in the first resource area.