Uplink Resource Allocation in Heterogeneous Networks
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Solution Overview
Problem
In heterogeneous wireless communication networks, the uplink interference variation in small cells is not effectively managed by existing coordination mechanisms, leading to inefficient link adaptation and limited network capacity due to unpredictable interference levels, which are not adequately addressed by current techniques like ICIC, eICIC, or CA-ICIC.
Innovation Solution
A method for uplink radio resource allocation that groups mobile stations into interfering and non-interfering categories based on their impact on secondary cells, using parameters like downlink reception power, uplink transmission power, and spatial position, to form and adapt radio resource allocation patterns, reducing interference variation and enhancing capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing coordination mechanisms (ICIC, eICIC, CA-ICIC) are used in HetNet, then cell edge UE performance is improved, but uplink interference variation in small cells is not effectively managed
Solution Approach 1:
The patent segments mobile stations into different groups based on their interference impact on small cells. Specifically, it divides mobile stations into those that cause high uplink interference to small cells and those that do not, enabling differentiated resource allocation strategies for each group.
Solution Approach 2:
The patent applies local quality by creating cell-specific resource allocation patterns tailored to each small cell's interference characteristics. Each small cell can have customized resource allocation patterns that reflect its specific interference situation, rather than applying uniform network-wide coordination.
2Productivity
If radio resources are allocated without coordination in HetNet, then resource allocation flexibility is maintained, but link adaptation efficiency is limited due to unpredictable interference levels
Solution Approach 1:
The patent performs preliminary action by pre-determining resource allocation patterns for mobile stations based on their interference characteristics. The network node identifies which mobile stations will cause high interference and pre-allocates resources accordingly, allowing the small cell to predict and adapt to interference levels in advance.
Solution Approach 2:
The patent implements feedback mechanisms where the small cell reports interference measurements and resource allocation patterns to the network node, which then adjusts the allocation patterns accordingly. This closed-loop feedback enables continuous optimization of resource allocation based on actual interference conditions.
3Strength
If macro cells use high transmission power, then downlink coverage is improved, but uplink interference to small cells increases
Solution Approach 1:
The patent extracts the interfering mobile stations from the general resource allocation pool and creates separate resource allocation patterns for them. By identifying and separating the mobile stations that cause high uplink interference to small cells, the system can apply specific resource restrictions or power control measures only to these problematic users.
Solution Approach 2:
The patent introduces an intermediary coordination mechanism where the network node acts as a mediator between macro cells and small cells. The network node receives interference information from small cells, processes it, and generates appropriate resource allocation patterns that balance the needs of both macro and small cells.
Data Source
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AI summary
The present invention relates to a method for uplink radio resource allocation in a cellular wireless communication system, said cellular wireless communication system comprising: at least one first cell associated with a first control node and one or more first mobile stations served by said first cell, and at least one second cell associated with a second control node and one or more second mobile stations served by said second cell, and said method comprising the steps of: grouping, by said first control node, said one or more first mobile stations into at least two different groups depending on an interference impact of a first mobile station on said second cell; allocating, by said first control node, uplink radio resources of said first cell for said one or more first mobile stations based on said grouping so as to obtain a first radio resource allocation pattern for said one or more first mobile stations; transmitting, by said first control node, a first message comprising said first radio resource allocation pattern; receiving, by said second control node, said first message comprising said first radio resource allocation pattern; and allocating, by said second control node, uplink radio resources of said second cell for one or more second mobile stations based on said first radio resource allocation pattern. Furthermore, the invention also relates to a method in a first control node, a method in a second control node, a first control node device, a second control node device, a computer program, and a computer program product thereof.