Orthogonal Resource Allocation for 5G Inter-Cell Interference Management
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Solution Overview
Problem
In 5G networks, existing resource allocation techniques fail to effectively manage inter-cell interference (ICI) between QAM and FQAM modulation schemes, leading to suboptimal performance due to Gaussian distribution of ICI, which is worsened by the increasing number of aggressors, and do not account for varying interference levels among user equipment (UEs).
Innovation Solution
The implementation of advanced beamforming algorithms and the use of Almost Blank Sub-frames (ABS) to create orthogonal resource allocation in space and time domains, allowing for the selective deployment of FQAM and QAM modulation schemes based on interference levels, utilizing Full-dimension MIMO and mm-wave beam scheduling to maximize spectrum efficiency and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If FQAM modulation is deployed to improve victim cell performance by deviating ICI from Gaussian distribution, then performance for users experiencing heavy interference is improved, but data throughput decreases
Solution Approach 1:
The patent applies local quality by selectively deploying FQAM modulation only to specific resource blocks where interference levels are high and the number of aggressors is low, rather than uniformly applying it across all resources. This allows the system to achieve performance improvement for affected users while maintaining higher throughput in less interfered regions.
Solution Approach 2:
The patent segments the resource allocation by dividing available resource blocks into different categories based on interference characteristics. Some resource blocks are allocated to FQAM for high-interference scenarios while others use conventional QAM for low-interference scenarios, allowing the system to optimize both reliability and throughput across different segments.
2Reliability
If all aggressors employ FQAM to maximize ICI deviation from Gaussian distribution, then capacity improvement is maximized, but the benefit diminishes when the number of aggressors increases due to central limit theorem
Solution Approach 1:
The patent implements dynamic modulation scheme selection that adapts to the current interference environment. The base station continuously monitors the number of aggressors and interference levels, then dynamically switches between FQAM and QAM modulation schemes. When the number of aggressors is low, FQAM is used to maximize capacity improvement; when aggressors increase, the system transitions to QAM to maintain consistent performance.
3Reliability
If FQAM and QAM resources are allocated orthogonally to accommodate UEs with different interference levels, then both high-interference and low-interference UEs can coexist optimally, but resource allocation complexity increases
Solution Approach 1:
The patent applies partial action by using FQAM modulation only for the portion of resource blocks where it provides significant benefit (high-interference regions with few aggressors), while using conventional QAM for the remaining resources. This partial deployment of FQAM achieves the necessary orthogonality for different UE types without requiring complete resource separation, thereby reducing allocation complexity.
Data Source
AI summary
A base station is configured to communicate with at least a first user equipment (UE) and a second UE, wherein the base station is configured to communicate with the first UE using a first modulation scheme, and with the second UE using a second, different, modulation scheme, wherein communications with the first and second UEs are arranged to be substantially orthogonal to each other. A method of allocating resources in a communication network comprising a base station operable to communicate with a first user equipment (UE) and a second UE, the method comprising using a first modulation scheme for communication with the first UE, and using a second, different, modulation scheme for communication with the second UE, wherein communications with the first and second UEs are configured to be substantially orthogonal to each other.