Score-Based Interference Coordination in LTE Systems
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Solution Overview
Problem
In LTE cellular radio communication systems, there is no direct protection against intra-system interference, and the decentralized network architecture lacks centralized interference coordination, leading to increased interference and reduced user throughput due to wider transmission bandwidths.
Innovation Solution
A method for coordinating intra-system interference through exchanging coordination messages between transceiver stations and determining a score for potential radio resource allocations to mitigate interference, which involves calculating a transmission capacity score based on interference levels and Channel Quality Indicators (CQI) to optimize resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If transmission bandwidth is increased to provide higher data rates, then spectral efficiency is improved, but intra-system interference increases due to wider bandwidth overlap between cells
Solution Approach 1:
The patent changes the parameter of transmission bandwidth to enable higher data rates, while simultaneously introducing interference coordination mechanisms that dynamically adjust resource allocation parameters to mitigate the resulting intra-system interference through score-based evaluation of potential allocations
Solution Approach 2:
The patent implements feedback mechanisms where transceiver stations exchange coordination messages about interference conditions and resource usage, allowing the system to continuously adapt resource allocation decisions based on measured interference levels and achieve optimal spectral efficiency while controlling interference
2Device complexity
If decentralized network architecture is adopted to simplify network control, then device complexity is reduced, but interference coordination capability deteriorates due to lack of centralized control
Solution Approach 1:
The patent enables each transceiver station to autonomously evaluate potential radio resource allocations using locally computed interference scores based on exchanged coordination messages, allowing decentralized interference coordination without requiring centralized control while maintaining reliable interference management
Solution Approach 2:
The patent performs preliminary exchange of coordination messages between transceiver stations before making resource allocation decisions, allowing each station to pre-evaluate potential allocations and their interference impact on neighbors, thereby enabling reliable decentralized coordination
Data Source
AI summary
An interference coordination method for a radio communication system includes a plurality of user equipment configured to communicate on radio resources with transceiver stations exchanging between transceiver stations one or more coordination messages concerning interference on an interfered radio resource, and determining a score of a potential allocation of the interfered radio resource to potentially-interfered user equipment based on said coordination message or messages. In particular, the radio resource scheduling method includes generating, for a transceiver station serving respective served user equipment, a set of candidate aggregate allocations including corresponding potential allocations of radio resources to respective served user equipment, performing the interference coordination method to determine a score of each potential allocation in the candidate aggregate allocations, computing a total score of each candidate aggregate allocation based on the scores of the corresponding potential allocations, and allocating radio resources to respective served user equipment based on the total scores of the candidate aggregate allocations.