IAB Donor Packet Forwarding Across Donors After Backhaul Failure
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Solution Overview
Problem
In cellular communication systems with Integrated Access and Backhaul (IAB) nodes, failures in backhaul links between relay nodes and donor base stations can lead to the inability to transmit packets, as the packets are encrypted for specific donor base stations, making re-routing complex and ineffective.
Innovation Solution
Implementing inter-donor re-routing mechanisms that allow IAB nodes to forward packets through alternative donor base stations, establishing data forwarding paths and configuring new BAP addresses to ensure seamless packet transmission even in the event of link failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If packets are encrypted for specific donor base stations, then security and packet integrity are improved, but re-routing capability deteriorates when backhaul links fail
Solution Approach 1:
The patent establishes data forwarding paths between donor base stations in advance before link failures occur. When a backhaul link fails, relay nodes can immediately utilize these pre-configured forwarding paths without requiring complex real-time re-routing decisions, thus maintaining packet transmission reliability while enabling adaptive re-routing capability
Solution Approach 2:
The patent introduces donor base stations as intermediary nodes that can forward packets between relay nodes connected to different donors. When direct paths fail, packets are routed through intermediate donor base stations that decrypt and re-encrypt packets, enabling re-routing while maintaining security through controlled decryption at intermediary nodes
2Stability of the object's composition
If relay nodes use fixed donor base station connections, then connection stability is improved, but communication continuity deteriorates when link failures occur
Solution Approach 1:
The patent enables dynamic path selection by allowing relay nodes to switch between direct connections to their primary donor and indirect connections through intermediate donors. The system maintains stable primary connections while establishing backup paths, allowing seamless transitions when link failures occur, thus preserving both connection stability and communication continuity
Solution Approach 2:
The patent pre-configures alternative data forwarding paths and maintains connection state information for backup routes before failures occur. This beforehand cushioning ensures that when link failures happen, relay nodes can immediately switch to pre-prepared alternative paths without interruption, maintaining communication continuity while preserving connection stability through controlled failover
3Adaptability or versatility
If multiple donor base stations are involved in re-routing, then path redundancy is improved, but system complexity increases
Solution Approach 1:
The patent segments the complex multi-donor routing problem into manageable components by establishing separate data forwarding paths between specific donor pairs. Each donor base station manages its own forwarding relationships independently, breaking down the overall system complexity into modular, independently manageable segments while maintaining path redundancy
Solution Approach 2:
The patent creates universal data forwarding mechanisms that can be applied across multiple donor base stations using standardized procedures. The same path establishment and packet forwarding principles apply regardless of which specific donors are involved, reducing system complexity through universality while enabling path redundancy through multi-donor participation
Data Source
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AI summary
In a first aspect, a communication control method is used in a cellular communication system. The communication control method includes transmitting, by a first relay node subordinate to a first donor base station, a first packet to a second donor base station different from the first donor base station. The communication control method includes forwarding, by the second donor base station, the first packet to the first donor base station by using a path for data forwarding, and transmitting, by the first donor base station, the first packet to a network.