Radio Resource Management Device for Inter-Cell Interference Reduction
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Solution Overview
Problem
Conventional methods for reducing inter-cell interference in radio resource management systems limit the number of code resources per cell, thereby reducing the number of ACK/NACKs that can be transmitted, especially when the number of neighboring cells increases.
Innovation Solution
A radio resource management apparatus and method that allocate different control channel element numbers between neighboring cells, allowing for unique CCE numbers to be used for PDCCH transmission, which reduces inter-cell interference and increases the number of ACK/NACKs that can be transmitted.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional methods allocate the same control channel element numbers to neighboring cells, then the system structure remains simple, but inter-cell interference increases and the number of ACK/NACKs that can be transmitted decreases
Solution Approach 1:
The patent applies local quality by allocating different CCE number ranges to different neighboring cells. Specifically, even-numbered CCEs (0, 2, 4, 6, 8, 10) are allocated to one cell while odd-numbered CCEs (1, 3, 5, 7, 9, 11) are allocated to another cell. This localized differentiation in resource allocation reduces inter-cell interference while maintaining systematic management.
Solution Approach 2:
The patent segments the total CCE resources into separate groups for different cells. By dividing the CCE space into distinct ranges (even numbers for one cell, odd numbers for another), the system prevents interference between neighboring cells while maximizing the utilization of available code resources for ACK/NACK transmission.
2Reliability
If the number of code resources per cell is limited to reduce interference, then inter-cell interference decreases, but the number of ACK/NACKs that can be transmitted decreases
Solution Approach 1:
The patent resolves the contradiction by introducing a new dimension for resource differentiation - using the parity (even/odd) attribute of CCE numbers rather than simply limiting the total number of resources. This dimensional approach allows full utilization of available CCEs while maintaining interference reduction through systematic allocation patterns.
Solution Approach 2:
The patent changes the allocation parameter from a quantitative limit (number of resources) to a qualitative distinction (even/odd CCE numbers). This parameter transformation allows the system to maintain a high number of transmissible ACK/NACKs while achieving interference reduction through the structural organization of resource allocation.
3Quantity of substance
If CAZAC sequences of adjacent cyclic shift amounts are used, then the number of code resources increases, but separation performance degrades due to interference leakage
Solution Approach 1:
The patent applies preliminary action by pre-establishing a systematic allocation rule (even/odd CCE differentiation) before transmission occurs. This advance organization of resource allocation prevents interference leakage from occurring in the first place, rather than attempting to mitigate it after the fact, thereby maintaining both high code resource utilization and reliable separation performance.
Data Source
AI summary
A radio resource management apparatus and radio resource management method, the radio resource management apparatus including a resource allocation section that, when a plurality of control channel elements are allocated to a physical downlink control channel for downlink data transmission, generates resource allocation information on control channel element numbers corresponding to the plurality of control channel elements, such that the control channel element numbers are different between neighboring cells, and a reporting section that reports an allocation result in the resource allocation section to a subordinate radio communication base station apparatus.