IAB Node BAP Address Rewriting for Wireless Latency
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Solution Overview
Problem
In wireless communication systems, especially with the introduction of new radio technologies, base stations face challenges in efficiently managing the increased data and control information due to limited resources, leading to latency issues that affect performance in applications requiring low delay.
Innovation Solution
An Integrated Access and Backhaul (IAB) node is configured with Backhaul Adaptation Protocol (BAP) addresses for donor nodes, allowing for packet rewriting based on a configured rewriting table to ensure correct routing and reduce latency by determining the destination BAP address and path ID, thereby optimizing data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an IAB node is configured with multiple BAP addresses for different donor nodes, then network redundancy and reliability are improved, but device complexity and routing decision complexity increase
Solution Approach 1:
The patent applies preliminary action by pre-configuring a rewriting table in the IAB node before data transmission occurs. This table contains pre-determined mappings between packets and their corresponding destination BAP addresses and path IDs. When a packet arrives, the node simply performs a table lookup rather than making complex routing decisions in real-time, thus reducing routing complexity while maintaining the ability to handle multiple donor nodes for improved reliability
Solution Approach 2:
The rewriting table acts as an intermediary mechanism between the received packet and the routing decision. Instead of directly complex processing at the IAB node, the packet information is matched against pre-stored entries in the rewriting table, which provides the rewritten header information. This intermediary structure simplifies the routing process while enabling reliable multi-donor node operation
2Loss of time
If packet header rewriting is performed at the IAB node, then latency is reduced and data transmission speed is improved, but processing complexity and energy consumption increase
Solution Approach 1:
The rewriting table is pre-configured with all necessary packet rewriting information before actual data transmission. This preliminary preparation allows the IAB node to perform simple table lookups and header replacements during data forwarding, significantly reducing processing time and latency while minimizing real-time energy consumption compared to dynamic routing calculations
3Productivity
If the IAB node uses a configured rewriting table for packet routing, then routing accuracy and network efficiency are improved, but device complexity and memory requirements increase
Solution Approach 1:
The rewriting table is pre-configured with all necessary routing mappings before data transmission begins. This table stores the relationship between received packets and their corresponding destination BAP addresses and path IDs, allowing for efficient O(1) lookup operations during data forwarding, thus improving network efficiency while keeping the memory structure relatively simple and organized
Data Source
AI summary
An Integrated Access and Backhaul (IAB) node configured with a first Backhaul Adaptation Protocol (BAP) address related to a first donor IAB node and a second BAP address related to a second donor IAB node in a wireless communication system. Techniques include receiving a packet including a destination BAP address and a path identifier (ID). Based on the packet being received through the second link and the destination BAP address not matching the second BAP address, determining whether the destination BAP address and the path ID of the packet match at least one entry of a configured rewriting table. Based on the destination BAP address and the path ID of the packet matching the at least one entry, rewriting a header of the packet by setting the destination BAP address and the path ID according to the at least one entry, and transmitting the packet to a next hop node.