PSFCH HARQ Feedback Using Orthogonal Zone IDs
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Solution Overview
Problem
In the context of 5G V2X systems, the design of the Physical Sidelink Feedback Channel (PSFCH) for carrying Hybrid Automatic Repeat Request (HARQ) feedback faces challenges due to geographic location ambiguities, leading to issues with accurate HARQ feedback transmission and reception, particularly in sidelink communications.
Innovation Solution
A method is introduced where a first communication node transmits signaling indicating its identity and distance, and monitors a second signal to determine if the first signal is correctly received, adjusting the communication range based on its geographic location to ensure timely HARQ feedback, while a second communication node receives signaling to determine the identity and distance, and transmits or cancels feedback based on the signal's correctness, using orthogonal zones to compensate for location ambiguities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If geographic location zones are used to determine communication range, then device complexity is reduced, but measurement precision of distance deteriorates
Solution Approach 1:
The geographic location space is segmented into multiple orthogonal zones, where each zone is assigned a unique zone ID. This segmentation allows devices to determine communication range by comparing zone IDs rather than calculating exact distances, reducing computational complexity while maintaining sufficient precision for HARQ feedback determination.
Solution Approach 2:
The patent changes the parameter for distance determination from continuous geographic coordinates to discrete zone IDs. By transforming the continuous space into discrete zones and using zone ID comparisons, the system achieves a balance between computational simplicity and measurement precision suitable for V2X communication requirements.
2Reliability
If communication range is adjusted based on geographic location, then reliability of HARQ feedback is improved, but device complexity increases
Solution Approach 1:
The system pre-establishes orthogonal zones and assigns zone IDs before communication occurs. Devices perform preliminary location-to-zone mapping, storing the zone ID information for rapid comparison during HARQ feedback determination, avoiding complex real-time distance calculations.
Solution Approach 2:
Zone IDs serve as an intermediary parameter between geographic location and communication range determination. Instead of directly using continuous location coordinates for range calculations, the system uses discrete zone IDs as a mediator, simplifying the decision process for HARQ feedback while improving reliability.
3Ease of operation
If zone-based distance determination is used, then ease of operation is improved, but measurement precision of communication distance deteriorates
Solution Approach 1:
By segmenting the geographic space into orthogonal zones with unique IDs, the system transforms complex continuous distance calculations into simple discrete zone ID comparisons. This segmentation enables ease of operation while maintaining sufficient precision for determining whether devices are within communication range for HARQ feedback.
Solution Approach 2:
The patent changes the distance determination parameter from continuous geographic coordinates to discrete zone IDs. This parameter transformation simplifies the operation of distance determination through straightforward zone ID comparison, while the orthogonal zone design ensures adequate measurement precision for communication range assessment.
Data Source
AI summary
The present disclosure provides a method and a device in a communication node for wireless communications. A communication node transmits a first signaling, the first signaling is used to indicate a first identity (ID) and a first distance; transmits a first signal, the first signaling is also used to indicate time-frequency resources occupied by the first signal; and monitors a second signal, the second signal is used to determine that the first signal is not correctly received; a geographic location of the communication node is used to determine a first zone, and an ID of the first zone is used to determine the first ID; a first characteristic geographic location is a geographic location located within the first zone; a distance between a geographic location of the communication node and the first characteristic geographic location is used to determine the first distance. This application improves the effectiveness of feedback.