UE-to-Network Relay Indication Triggering in 5G D2D
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Solution Overview
Problem
In 5G communication systems, the periodic transmission of UE-to-Network relay indications by UEs leads to wastage of resources and increased power consumption, as multiple UEs may transmit these indications unnecessarily, even when there are no remote UEs in vicinity or when they are not needed for communication with the network.
Innovation Solution
A mechanism is introduced where UEs measure link quality parameters with the base station and only transmit UE-to-Network relay indications on a D2D discovery channel if these parameters meet specific criteria, such as Reference Signal Received Power (RSRP) and Reference Signal Received Quality (RSRQ) thresholds, and the base station sends response messages to trigger or stop this transmission based on these criteria.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UEs transmit UE-to-Network relay indications periodically, then remote UEs can discover relays, but resource usage increases and power consumption rises
Solution Approach 1:
The patent implements periodic transmission of UE-to-Network relay indications at configurable intervals. The network can adjust the periodicity based on deployment scenarios, allowing relays to transmit discovery messages periodically rather than continuously, thereby reducing power consumption while maintaining discovery functionality.
Solution Approach 2:
The patent introduces configurable parameters including transmission periodicity, power thresholds, and hysteresis values that can be adjusted by the network. These parameters allow dynamic adaptation of relay indication transmission behavior to match actual network conditions and remote UE density, optimizing the balance between discovery reliability and energy consumption.
2Area of stationary object
If multiple UEs transmit relay indications simultaneously, then discovery coverage is improved, but resource wastage increases
Solution Approach 1:
The patent implements a mechanism where UEs evaluate conditions (such as power thresholds and hysteresis criteria) before transmitting relay indications. This preliminary evaluation prevents unnecessary transmissions by UEs that do not meet the criteria, reducing resource wastage while maintaining adequate discovery coverage through selective participation.
Solution Approach 2:
The network provides feedback to UEs regarding transmission conditions and criteria. Based on this feedback, UEs adjust their transmission behavior, transmitting only when conditions are met. This feedback mechanism coordinates multiple UE transmissions to improve coverage while avoiding excessive resource consumption from redundant transmissions.
3Reliability
If relay indications are transmitted continuously, then remote UEs can always discover relays, but energy efficiency decreases
Solution Approach 1:
Instead of continuous transmission, the patent implements periodic transmission of relay indications with configurable intervals. This periodic approach maintains discovery reliability by ensuring relays are discovered at regular intervals while significantly improving energy efficiency by keeping transmission dormant between periods.
Solution Approach 2:
The patent introduces dynamic transmission behavior where UEs adjust their relay indication transmission based on changing conditions such as detected remote UE presence, power threshold evaluations, and hysteresis criteria. This dynamic approach allows the system to maintain reliability when needed while improving energy efficiency during periods when discovery is less critical.
Data Source
AI summary
The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4th-Generation (4G) communication system such as Long Term Evolution (LTE). Embodiments herein provide a method for triggering a transmission of a UE-to-Network relay indication comprising receiving, by UE, one of UE-to-Network relay criteria broadcasted by a base station, measuring, at the UE, a link quality parameter between the UE and the base station, detecting, by the UE, that the link quality parameter meets the UE-to-Network relay criteria, and transmitting, by the UE, the UE-to-Network relay indication (i.e. discovery message indicating itself as the UE-to-Network relay) on a Device to Device (D2D) discovery channel.