IAB Local Routing for Low-Latency V2X Message Relay
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing increased data traffic and latency in sidelink communication, particularly in scenarios involving integrated access and backhaul nodes, where direct communication between user equipment (UEs) is hindered by obstacles or the need for enhanced mobile broadband communication.
Innovation Solution
Implementing local routing through an integrated access and backhaul (IAB) node using a backhaul adaptation protocol (BAP) packet data unit (PDU) with a V2X local routing bit, enabling V2X message transmission between terminals via a V2X radio bearer and BAP layer, and configuring next hops and destination addresses based on an IAB donor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If direct sidelink communication is established between UEs, then communication overhead of eNB is reduced, but communication is hindered by obstacles and increased latency occurs
Solution Approach 1:
The patent introduces IAB nodes as intermediary devices between UEs to relay V2X messages when direct communication is blocked by obstacles. The IAB node receives messages from one UE and forwards them to the destination UE, enabling communication in obstructed environments while maintaining the benefits of sidelink communication for unobstructed scenarios.
2Reliability
If IAB nodes are introduced for local routing, then communication reliability in obstructed environments is improved, but device complexity increases
Solution Approach 1:
The patent implements local routing functionality specifically in IAB nodes that are positioned to provide coverage in obstructed areas, rather than requiring all network devices to have full routing capabilities. This allows the complexity to be localized to only those nodes that need it, while other nodes can operate with simpler functionality.
Solution Approach 2:
The IAB node is designed to perform multiple functions: it acts as both a relay for V2X messages and maintains its standard IAB functionality for backhaul communication. This multi-functionality allows the same device to handle both direct sidelink routing and obstacle-bypassing relay operations without requiring separate dedicated relay devices.
3Loss of time
If V2X messages are transmitted through IAB nodes with local routing, then latency is reduced compared to eNB intervention, but message transmission overhead increases
Solution Approach 1:
The patent segments the message transmission path into direct sidelink segments (when possible) and relay segments (when obstacles block direct communication). The BAP header includes routing information that enables the IAB node to forward messages efficiently without requiring full eNB intervention, thus reducing latency while managing overhead through intelligent routing decisions.
Data Source
AI summary
The method of performing local routing comprises configuring a next hop and a destination IAB address in a first IAB node based on an IAB donor, receiving a V2X message from a first terminal accessing the first IAB node, and transmitting the V2X message to a second terminal accessing a second IAB node through the second IAB node based on the local routing. When the first IAB node receives the V2X message from the first terminal through a V2X radio bearer, a backhaul adaptation protocol (BAP) packet data unit (PDU) comprising a BAP header with a V2X local routing bit set to enable and the V2X message may be generated, and the V2X message may be transmitted to the second terminal through the second IAB node based on a BAP layer.