Interference Coordination for GSM-LTE Co-Channel Deployment
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Solution Overview
Problem
During GL Refarming, the deployment of LTE with high bandwidth is limited due to high traffic loads in GSM networks, leading to low spectrum utilization and interference issues, necessitating additional spectrum purchases and geographic isolation, which restricts simultaneous use of GSM and LTE at adjacent frequencies.
Innovation Solution
A network-side coordination device pre-establishes an interference matrix to assess historical interference and real-time spectrum occupation, allowing terminals to determine if actual interference exceeds a threshold, thereby enabling or denying spectrum use, facilitating simultaneous deployment of different standards at the same frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If LTE is deployed at the same frequency as GSM, then spectrum utilization is improved, but co-channel interference between GSM and LTE occurs
Solution Approach 1:
The patent implements dynamic interference coordination where the network side dynamically determines whether a terminal can use a spectrum resource based on real-time interference conditions. The network side receives interference coordination requests from terminals, determines actual interference levels, and dynamically adjusts spectrum allocation decisions, allowing the system to adapt to changing interference conditions and enable same-frequency deployment of GSM and LTE when conditions permit.
Solution Approach 2:
The patent introduces an interference coordination mechanism as an intermediary layer between GSM and LTE systems. The network side acts as a mediator that receives requests from terminals, evaluates interference conditions, and makes coordinated spectrum allocation decisions. This intermediary coordination mechanism enables the two systems to share the same frequency by mediating their interactions and resolving interference conflicts in real-time.
2Productivity
If LTE bandwidth is increased to improve throughput, then spectral efficiency is improved, but GSM traffic load capacity is reduced
Solution Approach 1:
The patent enables dynamic spectrum allocation where LTE bandwidth can be flexibly adjusted based on actual interference conditions and traffic demands. Instead of static spectrum partitioning, the system dynamically determines LTE bandwidth allocation by evaluating real-time interference levels and GSM traffic load conditions, allowing LTE to utilize higher bandwidth when interference conditions permit while maintaining GSM capacity when needed.
Solution Approach 2:
The patent changes the parameter of spectrum allocation from fixed to variable. The network side determines whether terminals can use spectrum resources based on evaluated interference conditions, allowing LTE bandwidth parameter to be adjusted dynamically. This parameter change enables the system to optimize LTE throughput by allocating higher bandwidth when GSM traffic load is low, and vice versa, rather than being constrained by fixed spectrum partitions.
3Object-affected harmful factors
If geographic isolation is used to reduce interference, then interference between GSM and LTE is reduced, but deployment flexibility is reduced
Solution Approach 1:
The patent replaces geographic isolation with an intermediary interference coordination mechanism. Instead of requiring physical separation between GSM and LTE deployments, the network side acts as an intermediary that coordinates spectrum usage based on real-time interference conditions. This allows GSM and LTE to be deployed in the same geographic areas without physical isolation, significantly improving deployment flexibility while maintaining interference control through coordinated spectrum allocation decisions.
Data Source
AI summary
For a terminal located in any area of a first cell in a first system, a sum of actual interference of all second cells to any spectrum resource to be used by the terminal can be determined according to a pre-established interference matrix for representing historical reference interference of each second cell in a second system to each area in the first cell and a spectrum resource real-time occupation status of each second cell; when it is determined that the sum does not exceed a preset interference threshold value range, it is determined that the terminal can use the any spectrum resource; or when it is determined that the sum exceeds a preset interference threshold value range, it is determined that the terminal cannot use the any spectrum resource.