IAB Node BAP Header Routing ID Mapping for Seamless Handover
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Solution Overview
Problem
The challenge is to prevent loss of uplink packets and IP address allocation for an integrated access backhauled node (IAB node) during mobility between donor distributed units, specifically when separating the control domain and user domain.
Innovation Solution
A method involving the reception of a radio resource control (RRC) message with handover command and backhaul adaptation protocol (BAP) configuration information, reconfiguration of BAP packets, and transmission to a target IAB node, ensuring mapping between old and new routing IDs, is implemented to facilitate seamless handover and prevent packet loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an IAB node performs mobility between donor DUs by receiving handover command from source IAB node and transmitting to target IAB node, then the IAB node can migrate to new donor for network flexibility and load balancing, but uplink packets may be lost during the handover process and IP address allocation may fail
Solution Approach 1:
The source donor configures BAP header information including routing ID mapping (old routing ID to new routing ID) and transmits it to the IAB node before the handover is completed. This preliminary configuration enables the IAB node to immediately rewrite packet headers with correct new routing IDs once handover occurs, preventing packet loss during the transition between donor DUs
Solution Approach 2:
The source donor acts as an intermediary that provides the IAB node with target donor's routing information (new routing ID) and the mapping relationship to old routing ID. This intermediary role allows the IAB node to maintain packet forwarding capability during handover by using the provided routing ID mapping to rewrite headers, ensuring continuous uplink packet transmission without interruption
2Device complexity
If control domain and user domain are separated in IAB node during handover, then network architecture becomes more flexible and scalable, but packet loss occurs and IP address allocation fails
Solution Approach 1:
The handover process is segmented into control plane operations (RRC message exchange, handover command transmission) and user plane operations (data packet forwarding). The BAP header configuration including routing ID mapping is provided to the IAB node during control plane handover, enabling the user plane to independently rewrite packet headers and maintain data flow continuity despite control and user domain separation
Solution Approach 2:
The BAP header configuration with routing ID mapping acts as an intermediary mechanism that bridges the control domain and user domain separation. It provides the necessary routing information from the control plane to the user plane, enabling the IAB node to correctly forward uplink packets to the target donor while maintaining the separated architecture benefits
Data Source
AI summary
The present disclosure relates to: a communication technique for merging IoT technology with a 5G communication system for supporting a data transmission rate higher than that of a 4G system; and a system therefor. The present disclosure can be applied to intelligent services (for example, smart homes, smart buildings, smart cities, smartcars or connected cars, healthcare, digital education, small businesses, security- and safety-related services, and the like) on the basis of 5G communication technology and IoT-related technology. In the present invention, a method and a device related to packet and IP address processing according to mobility in a backhaul and access hole combination system are disclosed.