Intermediate U2N Relay SRB0 Header Mapping for RRC Setup Requests
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently transmitting Radio Resource Control (RRC) Setup Request messages over SRB0 in intermediate UE-to-Network (U2N) relay scenarios, particularly in scenarios involving Layer-2 (L2) U2N Relay UEs, due to the absence of headers in PC5 sidelink relay adaptation protocols.
Innovation Solution
The Intermediate U2N Relay UE receives an RRC Setup Request message on SRB0 within a first PC5 Sidelink Relay Adaptation Protocol (SRAP) Protocol Data Unit (PDU) without a header and transmits it to the L2 U2N Relay UE within a second PC5 SRAP PDU with a header, including the Remote UE's identity, facilitating proper bearer mapping and identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the Intermediate U2N Relay UE transmits RRC Setup Request messages without headers in PC5 SRAP PDUs, then transmission efficiency is improved, but bearer mapping and identification become difficult
Solution Approach 1:
The patent introduces an intermediary mechanism by adding a header to PC5 SRAP PDUs when transmitting RRC Setup Request messages through the Intermediate U2N Relay UE. This header contains necessary identification information that enables proper bearer mapping and message routing, resolving the contradiction between transmission efficiency and bearer mapping capability.
2Measurement precision
If the Intermediate U2N Relay UE adds headers to all PC5 SRAP PDUs, then bearer mapping accuracy is improved, but transmission overhead increases
Solution Approach 1:
The patent applies local quality by selectively adding headers only to specific PC5 SRAP PDUs that require bearer mapping (such as those containing RRC Setup Request messages), rather than adding headers to all PDUs. This approach maintains bearing mapping accuracy for necessary messages while minimizing unnecessary transmission overhead.
3Speed
If the Intermediate U2N Relay UE uses headerless PC5 SRAP PDUs for RRC message transmission, then message transmission speed is improved, but message identification and routing become unreliable
Solution Approach 1:
The header acts as an intermediary element that enables reliable message identification and routing without significantly impacting transmission speed. By including minimal necessary identification information in the header, the system maintains both speed and routing reliability.
Data Source
AI summary
An Intermediate UE-to-Network (U2N) Relay UE is disclosed. The Intermediate U2N Relay UE establishes a first PC5 connection with a Remote UE and establishes a second PC5 connection with a Layer-2 (L2) U2N Relay UE. The Intermediate U2N Relay UE receives a Radio Resource Control (RRC) Setup Request message on SRB0 from the Remote UE, wherein the RRC Setup Request message is included in a first PC5 Sidelink Relay Adaptation Protocol (SRAP) Protocol Data Unit (PDU) without header. The Intermediate U2N Relay UE transmits the RRC Setup Request message on SRB0 to the L2 U2N Relay UE, wherein the RRC Setup Request message is included in a second PC5 SRAP PDU with a first header and the first header includes a UE identity (ID) of the Remote UE and wherein the UE ID of the Remote UE is included in a RRC Reconfiguration message received from a network node.