Donor eNodeB TDD Subframe Configuration Transfer
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Solution Overview
Problem
Current systems face challenges in maintaining continuous and efficient TDD subframe configuration for LTE-TDD cells as mobile relay nodes move between multiple donor eNodeBs, leading to disruptions in network performance.
Innovation Solution
A method is introduced where the current donor eNodeB sends an LTE-TDD subframe configuration message to the target donor eNodeB through either the X2 or S1 interface, allowing for seamless switchover and maintaining continuity of TDD subframe configuration by determining the target eNodeB based on historical cell information from switchover requests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the mobile relay node moves between multiple donor eNodeBs, then the coverage range is expanded and deployment flexibility is improved, but the TDD subframe configuration continuity is disrupted and network performance deteriorates
Solution Approach 1:
The current donor eNodeB sends the TDD subframe configuration information to the target donor eNodeB in advance through the X2 interface before the mobile relay node completes the handover. This preliminary action ensures that the target donor eNodeB is already configured with the correct TDD subframe settings, eliminating configuration gaps and maintaining continuity during the mobility transition.
2Adaptability or versatility
If the TDD subframe configuration is reconfigured after mobile relay moves to target eNodeB, then the configuration can be optimized for new conditions, but the configuration delay disrupts service continuity
Solution Approach 1:
The TDD subframe configuration information is transferred in advance through the X2 interface before the handover is completed. This allows the target donor eNodeB to have the configuration ready beforehand, eliminating any delay that would occur if reconfiguration happened after the mobile relay node arrived at the new cell.
3Speed
If the current donor eNodeB sends TDD subframe configuration information to target donor eNodeB through X2 or S1 interface, then the configuration transfer speed is improved and service continuity is maintained, but the system complexity increases
Solution Approach 1:
The patent utilizes the existing X2 interface between donor eNodeBs as an intermediary channel for transferring TDD subframe configuration information. This approach leverages the already-established direct communication path between base stations, enabling fast configuration transfer without requiring new signaling mechanisms or increasing system complexity.
Data Source
AI summary
A transfer method for subframe configuration information of a serving cell and a donor eNodeB are applied in a mobile relay scene. The method comprises: a current donor eNodeB sending a cell activation message to a target donor eNodeB, wherein the cell activation message comprises Long Term Evolution Time Division Duplex (LTE-TDD) subframe configuration information of a serving cell of a mobile relay (MR) under the current donor eNodeB. The above-mentioned technical solution solves the problem how to ensure the continuity of the TDD subframe configuration in the cell of the target DeNB currently when the MR moves among several donor eNodeBs.