Network-Assisted Sidelink Discovery for V2X Beam Alignment
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently providing sidelink-based services, particularly in vehicle-to-everything (V2X) communications, due to high overhead and latency issues, and the need for effective beam alignment and discovery procedures in mmWave V2X communications.
Innovation Solution
A method and apparatus for network-assisted sidelink-based services, where user equipment (UEs) transmit discovery signals with identification information, and a base station facilitates connection establishment by providing necessary information to UEs, optimizing beam alignment and reducing unnecessary operations through the use of sidelink discovery procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If sidelink-based services are provided directly between UEs without network assistance, then communication overhead is reduced, but service provisioning efficiency and connection establishment reliability deteriorate
Solution Approach 1:
The base station serves as an intermediary that assists in sidelink connection establishment by providing discovery information to UEs. The base station receives service information from one UE, transmits it to another UE, and facilitates the discovery process without taking over the direct communication path, thus reducing overhead while improving provisioning efficiency
Solution Approach 2:
The base station performs preliminary actions by pre-configuring and transmitting discovery information to UEs before actual sidelink communication begins. This includes providing service capability information, resource configuration, and other necessary parameters in advance to enable efficient direct communication
2Reliability
If comprehensive discovery signals are transmitted to ensure reliable service discovery, then discovery reliability is improved, but transmission overhead and latency increase
Solution Approach 1:
The discovery information is segmented into different components and transmitted through multiple channels: some information is provided via base station broadcasting, while other information is exchanged directly between UEs through discovery signals. This segmentation allows comprehensive discovery while reducing redundant transmissions
Solution Approach 2:
Instead of transmitting all possible discovery information through discovery signals, the system uses partial action by providing essential information through the base station first, and only exchanging additional information through direct UE-to-UE signaling when necessary, thereby reducing overall latency
3Measurement precision
If beam alignment procedures are performed exhaustively to ensure accurate beam pairing, then beam alignment accuracy is improved, but procedure complexity and time consumption increase
Solution Approach 1:
The base station performs preliminary beam alignment by determining initial beam pairs and providing beam configuration information to UEs before actual sidelink communication. This preliminary action reduces the need for exhaustive beam sweeping between UEs, thereby maintaining accuracy while reducing complexity
Solution Approach 2:
The base station acts as an intermediary in the beam alignment process by coordinating beam pairing between UEs. It provides beam configuration information and facilitates the alignment process, reducing the complexity of direct UE-to-UE beam alignment while maintaining accuracy
Data Source
AI summary
The present disclosure relates to an operation method, by a first terminal in a wireless communication system, for providing a sidelink-based service in a wireless communication system. The method can comprise the steps of: transmitting, to a base station, information relating to a sidelink-based service provided by the first terminal; transmitting a discovery signal comprising information relating to the first terminal; receiving a response signal with respect to the discovery signal from a second terminal which has received the discovery signal; and establishing a connection with the second terminal to provide the service.