Donor eNB Relay Node Identification Management
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Solution Overview
Problem
In LTE-Advanced mobile communication systems, the increased process load on radio base stations due to multiple relay nodes connected to a single radio base station is exacerbated by the lack of clear management information during handovers to cells subordinate to relay nodes, leading to uncertainty in managing handover control signals and load information.
Innovation Solution
A mobile communication method where a radio base station notifies neighboring stations of identification information, such as PCI or ECGI, for cells managed by relay nodes connected to it, allowing for clear management and handover processes independent of the number of relay nodes, through mechanisms like eNB Configuration Update, X2 Setup Request, and X2 Setup Response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If relay nodes establish X2 interfaces with all neighboring radio base stations, then handover control can be performed, but process load on radio base stations increases
Solution Approach 1:
The patent introduces the donor eNB as an intermediary between relay nodes and neighboring eNBs. The donor eNB concentrates multiple X2 interfaces from relay nodes into a single X2 interface with the neighboring eNB, acting as a mediator that reduces the number of direct connections required while maintaining handover control functionality.
Solution Approach 2:
The patent merges multiple X2 interfaces from different relay nodes into a single concentrated X2 interface at the donor eNB. This combining approach reduces the total number of interfaces and process loads on neighboring eNBs while preserving the ability to perform handovers to cells served by relay nodes.
2Device complexity
If relay nodes are connected to a single radio base station, then device complexity is reduced, but management information for handover becomes unclear
Solution Approach 1:
The patent implements preliminary action by having the donor eNB pre-generate and forward cell identification information about relay node cells to neighboring eNBs through X2 signaling before handover is needed. This advance preparation ensures that neighboring eNBs have the necessary management information ready when handover is required.
Solution Approach 2:
The patent establishes a feedback mechanism where the donor eNB receives cell identification information from relay nodes and forwards it to neighboring eNBs. This feedback loop ensures that information flows from the relay node through the donor eNB to the neighboring eNB, maintaining clear management information flow despite the concentrated architecture.
Data Source
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AI summary
A mobile communication method according to the present invention includes a step of notifying, by a radio base station DeNB, a radio base station eNB of identification information (PCI or ECGI) of cells #1 to #3 subordinate to a plurality of relay nodes RN#1 to #3 as identification information of a cell subordinate to the radio base station DeNB when the plurality of relay nodes RN#1 to #3 are connected to the radio base station DeNB.