ProSe Discovery Pre-configuration for Out-of-Coverage UEs
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Solution Overview
Problem
In 5G communication systems, ProSe discovery between UEs is challenging in out-of-coverage and partial coverage scenarios, particularly for public safety applications where network coverage is not available.
Innovation Solution
A method and system for ProSe discovery pre-configuration, synchronization, and resource allocation that allows UEs to transmit discovery messages and synchronization signals using pre-configured resource pools and thresholds, enabling UE discovery even outside network coverage by determining transmission resources based on pre-configured information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UEs transmit discovery messages using network-configured resources, then discovery reliability is improved within network coverage, but discovery capability deteriorates in out-of-coverage scenarios
Solution Approach 1:
The patent applies preliminary action by pre-configuring UEs with discovery resource pools, synchronization signal configurations, and discovery message templates before network coverage is lost. This allows UEs to autonomously perform discovery operations in out-of-coverage scenarios without real-time network intervention, thereby maintaining discovery capability when network-dependent methods fail
2Measurement precision
If synchronization resources are allocated by network for sidelink transmission, then synchronization accuracy is improved within coverage, but synchronization capability deteriorates outside network coverage
Solution Approach 1:
The patent implements self-service by enabling UEs to autonomously generate and transmit synchronization signals using pre-configured parameters when operating outside network coverage. UEs independently perform timing and frequency synchronization without relying on network-provided synchronization resources, allowing synchronization capability to be maintained in out-of-coverage scenarios through self-sufficient operation
3Productivity
If discovery resources are restricted to network-configured pools, then resource allocation efficiency is improved within coverage, but discovery success rate deteriorates in partial coverage scenarios
Solution Approach 1:
The patent applies dynamics by enabling UEs to dynamically switch between network-configured discovery resource pools and pre-configured fallback resource pools based on coverage conditions. When network coverage is available, UEs use network-configured resources for efficient allocation; when coverage is lost or partial, UEs transition to pre-configured resources, thereby maintaining discovery success rate across varying coverage conditions
Data Source
AI summary
A 5G or pre-5G communication system for supporting a higher data transmission rate beyond a 4G communication system such as long-term evolution (LTE) is provided, including a method for performing device to device (D2D) discovery by a user equipment (UE), which is out of the coverage area serviced by a base station, in a wireless communication network. The method includes the operations of receiving pre-configuration information for transmitting a discovery message, and transmitting the discovery message in a transmission resource determined on the basis of the pre-configuration information, wherein the pre-configuration information includes a list of pools for transmitting the discovery message, and the transmission resource is determined from the list of pools.