Relay UE D2D Signal Coordination to Prevent Duplicate Transmissions
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Solution Overview
Problem
Wireless access systems face inefficiencies in D2D communication due to unnecessary data retransmissions in backhaul and access links, particularly in D2D relay communication, where data is duplicated across multiple relay UEs without proper coordination.
Innovation Solution
A method involving relay user equipment (rUE) that receives a higher layer signal with a reference value for signal quality measurement, selects access links based on this value, and relays D2D signals only for links meeting specific quality criteria, using identifiers to prevent duplicate transmissions, and coordinates with other rUEs to avoid redundant data forwarding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple relay UEs forward D2D data without coordination, then D2D communication coverage is extended, but duplicate data transmissions occur in backhaul and access links
Solution Approach 1:
The source UE performs preliminary actions by determining the set of relay UEs that will forward D2D data before actual transmission begins. The source UE identifies relay UEs with good backhaul link quality and pre-configures them to forward data, preventing uncoordinated duplicate transmissions by multiple relay UEs
Solution Approach 2:
The system implements feedback mechanisms where relay UEs report backhaul link quality measurements to the source UE. The source UE uses this feedback information to selectively determine which relay UEs should forward D2D data, ensuring that only relay UEs with sufficient link quality participate in forwarding, thereby avoiding duplicate transmissions
2Reliability
If relay UEs forward D2D data on all access links, then data delivery reliability is improved, but unnecessary retransmissions occur in backhaul and access links
Solution Approach 1:
The patent applies local quality by having relay UEs evaluate and forward D2D data selectively based on the quality of individual access links. Each relay UE determines whether to forward data on a specific access link based on local link quality conditions, rather than uniformly forwarding on all access links, thus avoiding unnecessary retransmissions while maintaining reliability where needed
3Productivity
If relay UEs coordinate to prevent duplicate transmissions, then network resource utilization is optimized, but coordination complexity between relay UEs increases
Solution Approach 1:
The patent merges the coordination function into a single entity - the source UE. Instead of having multiple relay UEs coordinate with each other (which would increase complexity), the source UE consolidates the coordination role by determining which relay UEs should forward data based on feedback from all relay UEs. This merging approach optimizes network resource utilization while keeping coordination complexity manageable by centralizing the decision-making function
Data Source
AI summary
The present invention relates to a method for efficiently transmitting and receiving a device to device (D2D) signal by utilizing relay user equipment (rUE) in a wireless access system supporting D2D communication. As one embodiment of the present invention, a method by which rUE efficiently relays a D2D signal in a wireless access system supporting D2D communication can comprises the steps of: receiving, from a base station, an upper layer signal including a reference value for measuring signal quality; measuring signal quality for at least one access link; selecting an access link to be relayed on the basis of the reference value; and relaying a D2D signal for the selected access link.