Relay Node Configuration Clustering in LTE-Advanced Networks
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Solution Overview
Problem
Current relay node configuration and re-configuration methods in 3GPP LTE-Advanced networks face challenges such as high complexity, slow response times, and inefficiencies in handling traffic fluctuations and donor eNB failures, leading to suboptimal network performance and increased signaling overhead.
Innovation Solution
A method and apparatus that divide the network into clusters with each cluster having a single donor eNB, where relay nodes are associated based on monitored and estimated load and handover rates, optimizing load balancing and minimizing inter-donor eNB handovers, using either a centralized or distributed management approach to ensure efficient and flexible re-configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If relay nodes perform self-configuration procedures with multiple re-association options, then network flexibility and optimization are improved, but configuration complexity and response time increase significantly
Solution Approach 1:
The patent segments the relay node configuration process into distinct phases: initial configuration phase (where relay nodes attach as UE and retrieve parameters) and subsequent relay-specific activities phase. This segmentation allows complex configuration to be broken down into manageable steps, reducing overall complexity while maintaining flexibility.
Solution Approach 2:
The patent implements preliminary action by having relay nodes retrieve initial parameters and donor eNB lists during the initial UE attachment phase before the actual relay configuration begins. This preliminary retrieval of configuration data (including donor eNB addresses, MME information, and S/P-GW details) prepares the necessary information in advance, reducing the complexity of subsequent configuration steps and enabling faster re-configuration when needed.
2Device complexity
If heuristic approaches like clustering are used for relay-donor eNB association, then computational complexity is reduced, but response time remains high (7-40 seconds) and location independence is lost
Solution Approach 1:
The patent implements self-service by enabling relay nodes to autonomously perform configuration and re-configuration without requiring complex centralized computations. Relay nodes independently monitor their own status, select appropriate donor eNBs from pre-retrieved lists, and execute re-attachment procedures locally. This self-service capability eliminates the need for time-consuming centralized clustering computations while maintaining configuration optimization.
3Ease of manufacture
If relay nodes are configured with specific donor eNBs based on radio characteristics, then initial configuration is simplified, but flexibility and robustness during failures are reduced
Solution Approach 1:
The patent applies dynamics by transitioning from static donor eNB configuration to dynamic re-configuration capability. Relay nodes are configured with lists of multiple candidate donor eNBs and are enabled to dynamically re-attach to different donor eNBs based on current network conditions, load status, and failure detection. This dynamic approach maintains initial configuration simplicity while significantly improving failure robustness and network adaptability.
Data Source
AI summary
A method for performing relay node configuration and re-configuration in relay enhanced networks, in particular in a 3GPP LTE-Advanced architecture, wherein the network includes a plurality of eNBs that function as donor eNBs providing wireless access to associated relay nodes, wherein the relay nodes function as eNBs from a UE perspective, is characterized in that the network is divided into clusters such that each cluster includes exactly one donor eNB and that each relay node is associated to at least one donor eNB any point in time, wherein the load of donor eNBs and the handover rates among relay nodes as well as between donor eNBs and relay nodes are monitored and/or estimated, wherein the association of relay nodes to donor eNBs is performed on the basis of the results of the monitoring and/or estimation. Furthermore, an apparatus for performing centralized relay node configuration in relay enhanced networks is disclosed.