Relay Handover Data Forwarding via Early S1 Path Switching
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Solution Overview
Problem
Relay-to-relay handovers in wireless communication networks face challenges such as limited bandwidth in wireless backhaul and inefficient data buffering, leading to potential data loss and increased packet loss during handover processes.
Innovation Solution
Implementing smart forwarding schemes using synchronous Packet Data Convergence Protocol (PDCP) Sequence Numbers and early S1 path switching, with the serving access node acting as a proxy S1 termination point to optimize data forwarding and reduce redundant data transmission during handovers between relay nodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional handover procedures are used between relay nodes, then the handover process can be completed, but data loss and packet loss occur due to inefficient data buffering and limited wireless backhaul bandwidth
Solution Approach 1:
The patent applies preliminary action by establishing a target relay node before the actual handover occurs. The serving relay node forwards data to the target relay node in advance, and the donor access node performs early S1 path switching to the target relay node before the UE actually connects to it. This preliminary setup ensures data is already buffered and paths are ready, preventing data loss during the actual handover moment and improving bandwidth usage efficiency.
2Area of stationary object
If relay nodes are used to extend coverage, then wireless coverage is enhanced, but the wireless backhaul bandwidth becomes a bottleneck during handover
Solution Approach 1:
The patent uses preliminary action by having the serving relay node forward data to the target relay node before handover occurs, and the donor access node establish the S1 path to the target relay node in advance. This ensures that when handover happens, the backhaul path is already established and ready, avoiding bandwidth congestion and ensuring smooth transition without disrupting the extended coverage area.
Solution Approach 2:
The patent introduces the donor access node as an intermediary that performs early S1 path switching. This intermediary coordinate the handover process between the serving relay node and target relay node, managing the data forwarding and path switching to optimize the use of limited wireless backhaul bandwidth while maintaining the extended coverage capability.
3Productivity
If data buffering is performed during handover, then data transmission can continue, but redundant data transmission occurs and bandwidth is wasted
Solution Approach 1:
The patent implements feedback mechanisms where the serving relay node provides feedback about data buffering status to the donor access node. The donor access node uses this feedback information to make informed decisions about when to switch the S1 path and when to stop forwarding data, preventing redundant data transmission and optimizing bandwidth usage while maintaining data transmission continuity.
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting the S1 path switching timing based on real-time handover status. The donor access node changes the path switching parameter from early switching to delayed switching based on feedback from the serving relay node, optimizing both data transmission continuity and bandwidth efficiency by avoiding redundant transmissions.
Data Source
AI summary
A method is provided for handing over a user equipment (UE). The method includes a donor access node with which the UE is in communication via a serving relay node receiving UE context information. The method further includes the donor access node using the UE context information to identify data packets that belong to the UE, wherein the data packets are forwarded from the serving relay node to a target relay node.