PDCCH Load Coordination for Inter-Cell Interference Reduction
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Solution Overview
Problem
The existing methods for allocating physical downlink control channel (PDCCH) resources in wireless communication systems face challenges such as high inter-cell interference, inefficient use of radio resources, and suboptimal performance, especially for UEs at the cell edge, due to coarse CCE aggregation level settings and slow adaptation processes.
Innovation Solution
A method and system that detect inter-cell interference conditions and generate requests between base stations to adjust PDCCH loads, allowing neighboring cells to reduce their PDCCH loads dynamically based on capacity utilization and user distributions, thereby reducing inter-cell interference and optimizing resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If PDCCH load is increased to accommodate more VoIP calls, then network capacity is improved, but inter-cell interference increases
Solution Approach 1:
The patent implements dynamic PDCCH load adjustment where base stations continuously monitor interference conditions and adaptively change their PDCCH resource allocation. The system transitions from static to dynamic control by detecting interference conditions and generating load adjustment requests in real-time, allowing the network to optimize capacity while managing interference levels adaptively.
Solution Approach 2:
The patent establishes a feedback mechanism where base stations detect inter-cell interference conditions, generate load adjustment requests, and receive responses from neighboring base stations. This closed-loop feedback system enables continuous optimization of PDCCH load based on actual interference measurements, allowing the network to maintain high capacity while controlling interference through iterative adjustments.
2Productivity
If CCE aggregation level is reduced to increase PDCCH capacity, then more users can be served, but PDCCH decoding failure rate increases
Solution Approach 1:
The patent dynamically changes the CCE aggregation level parameter based on detected channel conditions and interference levels. Instead of using fixed coarse settings, the system adjusts this critical parameter adaptively, selecting appropriate aggregation levels that balance capacity and reliability requirements according to current network conditions.
Solution Approach 2:
The system transitions from static CCE aggregation level configuration to dynamic adjustment based on real-time channel quality indicators and interference conditions. This enables the network to optimize the trade-off between PDCCH capacity and decoding reliability by adapting the aggregation level to current conditions rather than using fixed conservative settings.
3Reliability
If PDCCH resources are increased to handle high VoIP traffic, then voice call quality is improved, but data region resources are wasted
Solution Approach 1:
The patent implements dynamic PDCCH resource allocation that adjusts control region size based on actual traffic conditions. During periods of high VoIP traffic, the system increases PDCCH resources to maintain call quality, while during lower traffic periods, it reduces PDCCH allocation to maximize data region availability, thereby eliminating the need for static over-provisioning.
Solution Approach 2:
The system dynamically changes the PDCCH resource allocation parameter based on traffic type and intensity. By monitoring VoIP call volumes and adjusting the control region size accordingly, the network can ensure sufficient PDCCH capacity for voice services while maximizing data region resources when voice traffic demand is lower.
Data Source
AI summary
A method and system for allocating PDCCH resources in a wireless communication system are disclosed. According to one aspect, a method includes detecting at a first base station a condition of inter-cell interference, ICI, between a first cell and a neighboring cell, indicating that the first cell is in a coordination need state. The method includes generating at the first base station serving the first cell a request to lower a first PDCCH load of the neighboring cell to reduce the ICI between the first cell and the neighboring cell, a PDCCH load of a cell being defined as a ratio of used resource elements to total available resource elements within the cell.