Relay Node Interference Coordination via Base Station Signaling
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Solution Overview
Problem
Current radio communication systems with relay nodes struggle to effectively coordinate backhaul subframe configurations between relay nodes registered to different base stations, leading to interference between RN-access links, as existing methods only allow recognition of relay nodes registered to the same base station.
Innovation Solution
Implementing a communication system where base stations exchange information about the identity of relay nodes with each other, enabling the identification of relay nodes registered to other base stations and acquisition of necessary backhaul subframe configurations for interference coordination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If base stations only recognize relay nodes registered to themselves, then the device complexity and information management is simplified, but the ability to coordinate backhaul subframe configurations and reduce interference between RN-access links is degraded
Solution Approach 1:
The patent segments the network information management by introducing a new information element (BackhaulSubframeConfiguration) that is specifically exchanged between base stations for relay node coordination, while keeping other network management functions separate and unchanged. This allows targeted information sharing without complicating the overall system architecture.
Solution Approach 2:
The patent introduces base stations as intermediaries that exchange relay node configuration information through a dedicated interface. This intermediary mechanism enables coordination between base stations serving different relay nodes, allowing them to adjust backhaul subframe configurations to minimize interference without requiring direct communication between relay nodes or centralized control.
2Object-affected harmful factors
If base stations exchange relay node identity information with each other, then the coordination capability and interference reduction is improved, but the device complexity and signaling overhead increases
Solution Approach 1:
The patent applies local quality by exchanging only the specific BackhaulSubframeConfiguration parameters that are directly relevant to interference coordination, rather than sharing all relay node information. This targeted approach reduces signaling overhead while maintaining the essential coordination capability between base stations.
Solution Approach 2:
The patent changes the parameter set being exchanged to only include backhaul subframe configuration parameters (such as subframe patterns, timing information) that are necessary for interference coordination. This parameter selection optimizes the balance between coordination effectiveness and signaling overhead by excluding unnecessary information.
3Productivity
If relay nodes use common radio resources for both backhaul and access links, then the resource utilization efficiency is improved, but the self-interference at relay nodes increases
Solution Approach 1:
The patent implements periodic action by configuring relay nodes to switch between backhaul and access link operations in periodic time slots. The BackhaulSubframeConfiguration defines specific subframe patterns where the relay node alternates between receiving from and transmitting to the base station, preventing simultaneous transmission and reception that would cause self-interference.
Solution Approach 2:
The patent applies dynamics by making the relay node's operational mode dynamic rather than static. The relay node can dynamically switch between backhaul and access link functions based on the configured subframe pattern, allowing flexible resource allocation that maintains high utilization while preventing self-interference through time-division multiplexing.
Data Source
AI summary
A communication system and method that allows a DeNB to identify a RN registered to another DeNB and to acquire necessary information for coordinating interference from RNs registered to the other DeNB are provided. The communication system includes a plurality of communication nodes which includes a plurality of base stations and a plurality of relay nodes, wherein each relay node has a radio connection with a base station, wherein each base station exchanges information indicating identity of a relay node with another base station.