Bidirectional Sidelink Bearer Setup for Compatible V2X Peer Configuration
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Solution Overview
Problem
Existing wireless communication systems face challenges in configuring compatible sidelink radio link control (SLRB) configurations between peer devices in V2X communications, particularly in vehicular applications, due to the peer-to-peer nature of sidelink communication, where conflicting configurations can occur.
Innovation Solution
A method for establishing bidirectional sidelink radio link control bearers (SLRBs) between peer devices, involving dynamic selection of logical channel identification (LCID) and configuration of SLRB parameters through sidelink radio resource control signaling to ensure consistent configurations for both devices, allowing data and feedback transmission over a single logical channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If preconfigured or base station-provided SLRB configurations are used in peer UEs, then configuration setup is simplified, but configuration compatibility between peer devices cannot be ensured
Solution Approach 1:
The patent applies preliminary action by having the first UE determine the second SLRB configuration parameters before establishing the bidirectional bearer. The first UE proactively selects parameters that are compatible with its own configuration, ensuring compatibility is built-in from the start rather than relying on preconfigured values that may conflict. This is evident in the method where the first UE determines parameters including logical channel identity, SLRB identity, and RLC mode based on its own configuration.
Solution Approach 2:
The patent implements dynamics by allowing the SLRB configuration parameters to be dynamically selected and adjusted based on the specific needs of the bidirectional communication scenario. Rather than using static preconfigured values, the first UE dynamically determines appropriate parameters that ensure compatibility, including dynamically selecting logical channel identities and RLC modes that work for both UEs in the peer-to-peer connection.
2Device complexity
If separate unidirectional logical channels are used for data and feedback transmission, then channel configuration is straightforward, but communication efficiency is reduced
Solution Approach 1:
The patent applies merging by combining data transmission and feedback transmission into a single bidirectional logical channel. Instead of maintaining separate unidirectional channels for data and feedback, the invention establishes one logical channel that handles both directions of communication efficiently. This is achieved by configuring the same logical channel identity for both data and feedback transmissions between the first and second UEs, reducing the number of channels needed while maintaining full communication functionality.
3Reliability
If bidirectional SLRB with consistent parameters is established, then communication reliability is improved, but configuration complexity increases
Solution Approach 1:
The patent applies self-service by having the first UE autonomously determine and configure the second SLRB parameters based on its own configuration, without requiring external intervention or complex negotiation protocols. The first UE independently selects compatible parameters including logical channel identity, SLRB identity, and RLC mode, and applies these configurations to establish the bidirectional bearer. This self-configuring approach reduces overall system complexity while ensuring reliable communication.
Data Source
AI summary
Peer devices may wirelessly communicate with each other over a bidirectional sidelink logical channel (LCH) through an established bidirectional sidelink radio bearer. An initiating device of the peer devices may dynamically select a logical channel ID for establishing a fully bidirectional or semi-bidirectional SLRB. At least two alternative sidelink radio resource control (PC5-RRC) procedures may ensure the SLRB parameters are configured correctly in the established logical channel. The procedures also allow the network to configure a limited SLRB which is used to couple the SLRB configuration in the direction in which limited traffic (e.g. feedback information such as robust header compression feedback and/or status reports) is transmitted.