Network Node Frequency Selection for UE Discovery
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently supporting UE discovery operations, particularly in selecting appropriate frequencies for sidelink discovery transmissions across different PLMNs, leading to ambiguity and inefficiency in inter-PLMN communication.
Innovation Solution
A method where a network node within the UE's Home PLMN receives a candidate frequency list and PLMN ID from the UE, and transmits a selected carrier frequency for sidelink discovery, using random selection, load-balancing, operator configuration, ProSe application type, or subscription information to determine the optimal frequency for UE announcement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the UE is provided with multiple candidate carrier frequencies for sidelink discovery transmission, then the flexibility and adaptability of frequency selection is improved, but ambiguity arises in selecting the appropriate frequency for inter-PLMN communication
Solution Approach 1:
The network node receives feedback from the UE regarding available carrier frequencies and PLMN information, then uses this feedback to determine and indicate the appropriate sidelink discovery frequency. This feedback mechanism resolves ambiguity by making frequency selection dependent on actual network conditions and UE capabilities.
Solution Approach 2:
The network node acts as an intermediary between the UE and the sidelink discovery transmission process. It receives candidate frequencies from the UE, processes this information along with PLMN identification, and provides a definitive frequency indication to the UE, thereby resolving the ambiguity that would otherwise exist in the frequency selection process.
2Measurement precision
If the network node provides detailed frequency selection information to the UE, then the precision of frequency selection is improved, but the signaling overhead and system complexity increase
Solution Approach 1:
The patent extracts only the essential information needed for frequency selection - the network node determines the appropriate frequency based on UE-provided candidate frequencies and PLMN information, then indicates only the selected frequency to the UE. This extraction approach provides precise frequency selection without transmitting all possible frequency combinations or selection criteria, thereby reducing signaling overhead and system complexity.
Data Source
AI summary
A method and device for a discovery operation of User Equipment (UE) in a wireless communication system are provided. The method in which a network node supports a discovery operation of a UE includes: receiving, by a network node within a Home Public Land Mobile Network (HPLMN) of the UE, a Discovery Request message from the UE, wherein the Discovery Request message includes a candidate frequency list including an available plurality of carrier frequencies for announcing by the UE and an announcing PLMN ID including a PLMN Identifier (ID) of each of the carrier frequencies included in the candidate frequency list; and transmitting, by the network node within the HPLMN, a Discovery Response message to the UE, wherein the Discovery Response message includes carrier frequency information that indicates a carrier frequency selected for announcing by the UE among the carrier frequencies included in the candidate frequency list.