Relay UE Selective D2D Data Forwarding
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Solution Overview
Problem
Current wireless access systems face challenges in efficiently supporting device-to-device (D2D) relay communication, particularly in determining which data to relay among D2D data received from various user equipment (UEs), especially for UEs outside the coverage area.
Innovation Solution
A method utilizing a relay UE in a wireless access system to efficiently relay D2D data by configuring the relay UE to identify and relay data from UEs outside the coverage area, employing techniques such as D2D synchronization signals, resource pool indicators, and relay bit indicators to differentiate and prioritize data from out-of-coverage UEs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a relay UE relays all received D2D data, then data transmission coverage is extended, but relay resource waste increases and efficiency decreases
Solution Approach 1:
The patent extracts and identifies only the necessary data for relaying by introducing indicator fields (relay bit, data type field) that enable the relay UE to distinguish between data requiring relay and data that does not. This selective extraction approach prevents wasting relay resources on data that can be directly transmitted or does not require relay services.
Solution Approach 2:
The patent changes the state of data packets by adding specific parameters (relay indicators, data type markers) that transform ordinary D2D data into relay-identified data. These parameter changes enable the relay UE to make intelligent decisions about which data to relay based on the presence and value of these indicators, rather than relaying all data uniformly.
2Reliability
If a relay UE relays all received D2D data, then data transmission reliability is improved, but device complexity increases
Solution Approach 1:
The patent extracts only the essential relay identification information from data packets, rather than requiring complex analysis of all data characteristics. By focusing on specific indicator fields (relay bits, data type markers), the relay UE can determine relay necessity with simple conditional logic, significantly reducing processing complexity while maintaining reliability.
Solution Approach 2:
The patent applies different quality levels of processing to different data packets based on local characteristics indicated by relay indicators. Data packets marked with relay indicators receive relay processing, while others bypass relay operations. This localized approach ensures reliability only where needed, avoiding unnecessary complexity in processing data that does not require relay services.
3Measurement precision
If indicator fields are added to differentiate relay data, then data relay accuracy is improved, but overhead increases
Solution Approach 1:
The patent applies partial action by adding relay indicators only to specific data packets that require relay services, rather than adding comprehensive metadata to all data. This selective approach achieves the necessary precision for relay identification while minimizing the overhead burden on the system.
Solution Approach 2:
The patent uses efficient parameter encoding by leveraging existing data structure fields (such as data type fields, indicator bits) to convey relay identification information. Rather than adding entirely new overhead structures, the patent modifies existing parameters to serve dual purposes, thereby improving accuracy while limiting overhead growth.
Data Source
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AI summary
The present invention relates to methods for efficiently relaying device to device (D2D) data utilizing a relay terminal (rUE) in a wireless access system supporting D2D communication, and apparatuses for supporting the methods. As one example of the present invention, a method for relaying D2D data by a relay terminal in a wireless access system supporting D2D communication may comprise the steps of: receiving a scheduling allocation (SA) signal for allocating a resource area where the D2D data are transmitted; receiving at least one D2D data; and relaying, from among the at least one D2D data, only the first D2D data received from a terminal out of coverage. The first D2D data among the at least one D2D data can be detected on the basis of a SA signal and a medium access control header relating to the at least one D2D data.