V2X Unicast RLC Configuration for 5G Direct Communication
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Solution Overview
Problem
Current 5G communication systems face challenges in ensuring reliable and low-latency packet transmission between vehicle-to-everything (V2X) terminals, particularly in supporting advanced services that require tight Quality of Service (QoS) and efficient direct communication.
Innovation Solution
The proposed solution involves an apparatus and method that enable unicast transmission or reception of packets between V2X terminals by selecting an appropriate Radio Link Control (RLC) transmission mode and obtaining RLC configuration information, allowing for direct communication through unicast sidelink in a wireless communication system, even when terminals are not within the coverage of a base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If direct communication between V2X terminals is implemented, then communication latency is reduced and reliability is improved, but device complexity increases due to the need for independent RLC configuration management
Solution Approach 1:
The base station acts as an intermediary that provides pre-configured RLC configuration information to terminals before direct communication occurs. This mediator approach allows terminals to perform direct V2X communication with high reliability while the complexity of configuration management is shifted to the base station, which has more resources to handle the complexity.
Solution Approach 2:
RLC configuration information is prepared and provided to terminals in advance through system information or dedicated signaling from the base station. This preliminary action ensures that when direct communication is needed, terminals already have the necessary configuration parameters ready, enabling immediate reliable communication without increasing operational complexity during the communication event.
2Loss of time
If unicast transmission mode is used for V2X communication, then QoS requirements are met with lower latency, but the system complexity increases due to multiple transmission mode support
Solution Approach 1:
The system dynamically selects between unicast and other transmission modes based on service requirements. The RLC configuration information includes mode indicators that allow the system to adaptively choose the appropriate transmission mode for each V2X service, enabling low-latency unicast communication when needed while maintaining support for other modes when appropriate, thus balancing performance and complexity.
Solution Approach 2:
Different RLC configuration parameters are applied based on the transmission mode required. The system changes parameters such as acknowledgment mode, block acknowledgment, and retransmission settings according to the selected transmission mode (unicast vs. other modes). This parameter-based approach allows flexible adaptation to different QoS requirements without requiring fundamentally different system architectures.
3Ease of operation
If RLC configuration information is provided through system information, then terminal setup is simplified, but information transmission overhead increases
Solution Approach 1:
The system information structure is designed to carry multiple types of configuration information in a unified manner. The RLC configuration information is integrated into existing system information blocks that serve multiple purposes, including but not limited to V2X configuration. This multi-functional approach allows RLC configuration to be provided along with other essential system parameters without requiring separate dedicated signaling structures, thus reducing overall overhead while maintaining ease of terminal configuration.
Data Source
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AI summary
The disclosure relates to a 5th generation (5G) or a pre-5G communication system provided to support a higher data transfer rate than a system after a 4th generation (4G) communication system such as long term evolution (LTE). An operation method of a terminal in a wireless communication system includes: obtaining an RLC transmission mode and RLC configuration information in the process of determining a V2X service requiring configuration of a unicast session and configuring the unicast session with another terminal; if the terminal is determined to be in the coverage of a base station, receiving an RLC transmission mode and RLC configuration information from the base station; and if it is determined that the terminal is not located in a base station coverage, obtaining a pre-configured unicast session and pre-configured RLC configuration information for each RLC transmission mode, which is mapped to a V2X service.