Multi-Link Split Bearer Setup for U2U Relay Reliability
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Solution Overview
Problem
Current mobile communication systems based on the 3GPP standard face challenges in efficiently managing communication between user equipment (UE) through sidelink relays, particularly in establishing and maintaining reliable multi-link split bearers for direct and indirect links, which affects communication quality and reliability.
Innovation Solution
A communication control method that involves transmitting multi-link split bearer establishment requests and acknowledgments between remote user equipment (UE) and relay UE, allowing for the configuration of a 'U2U multi-link split bearer' by establishing direct and indirect links, with identification information used to coordinate the setup of these bearers and ensure reliable data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a relay user equipment is introduced to enable indirect communication links, then communication reliability is improved, but device complexity increases
Solution Approach 1:
A relay user equipment is introduced as an intermediary node to establish indirect communication links between remote user equipments. The relay UE receives data from one remote UE and forwards it to another remote UE, enabling communication when direct links are unavailable or unreliable. This mediator approach resolves the contradiction by improving communication reliability through additional transmission paths while managing complexity through standardized relay protocols and procedures.
2Reliability
If multi-link split bearers are established for simultaneous direct and indirect communication, then communication quality is improved, but system complexity increases
Solution Approach 1:
The communication system is segmented into multiple independent links (direct link and indirect link via relay UE), each with its own bearer configuration. The data transmission is divided across these segmented paths, allowing simultaneous operation of direct and indirect communication channels. This segmentation enables improved communication quality through diversity gain while managing system complexity by treating each link as a separate, manageable entity with standardized configuration procedures.
Solution Approach 2:
The system dynamically manages multi-link split bearers by establishing, maintaining, and releasing direct and indirect communication paths based on real-time radio conditions and communication requirements. The relay UE and remote UEs dynamically adjust bearer configurations, switch between direct and indirect links, and coordinate resource allocation. This dynamic approach improves communication quality by adapting to changing conditions while managing complexity through automated control mechanisms.
3Reliability
If identification information is exchanged for coordinating bearer setup, then communication reliability is improved, but information overhead increases
Solution Approach 1:
Identification information of the relay user equipment is exchanged in advance during the bearer establishment phase, before actual data transmission begins. The remote UEs and relay UE share necessary identification data (such as UE IDs or bearer identifiers) through signaling messages during the connection setup. This preliminary exchange of identification information enables reliable coordination of multi-link bearers while minimizing ongoing overhead, as the identification data is established once and reused for subsequent communication coordination.
Data Source
AI summary
A communication control method is a communication control method in a mobile communication system configured to perform a first communication on a direct link between a first remote user equipment and a second remote user equipment, and a second communication on an indirect link between the first remote user equipment and the second remote user equipment via a relay user equipment. The communication control method includes transmitting, by the first remote user equipment having established the direct link with the second remote user equipment, a multi-link split bearer establishment request message to the second remote user equipment via the direct link, the multi-link split bearer establishment request message including identification information of the relay user equipment.