ABS Pattern Computation for PDCCH Interference in LTE
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless network environments, especially in LTE systems, the existing methods for almost blank sub-frame (ABS) based orthogonal resource allocation face challenges in minimizing interference while maintaining throughput, particularly at cell edges, due to the limitations of current inter-cell interference coordination techniques which either reduce throughput or are not effective in heterogeneous networks.
Innovation Solution
The proposed solution involves a method where a serving eNB receives ABS patterns from neighboring eNBs, sets a maximum duty cycle for the physical downlink control channel, and computes an optimal ABS pattern to minimize interference by identifying sub-frames with the least neighboring eNB activity, thereby optimizing resource allocation and reducing PDCCH interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ABS patterns are used for inter-cell interference coordination, then PDCCH signal quality is improved, but cell throughput is reduced
Solution Approach 1:
The patent implements dynamic ABS pattern computation that adapts to changing network conditions. The serving eNB continuously monitors neighboring eNB ABS patterns and dynamically adjusts its own ABS pattern and PDCCH duty cycle to optimize the trade-off between PDCCH signal quality and cell throughput based on real-time interference conditions.
Solution Approach 2:
The patent changes the parameter of PDCCH duty cycle to resolve the contradiction. By adjusting the PDCCH duty cycle parameter, the system can control the proportion of sub-frames dedicated to PDCCH transmissions, thereby balancing PDCCH signal quality improvement against cell throughput maintenance.
2Reliability
If ABS patterns are configured to protect PDCCH from interference, then signal reliability is improved, but resource allocation flexibility is reduced
Solution Approach 1:
The system dynamically computes ABS patterns based on received neighboring eNB patterns and current network conditions, allowing flexible adaptation while maintaining PDCCH protection. The dynamic computation enables the system to adjust resource allocation flexibility according to changing interference environments.
3Object-generated harmful factors
If maximum duty cycle of PDCCH is constrained, then interference to neighboring cells is reduced, but own cell throughput is limited
Solution Approach 1:
The patent uses parameter changes by adjusting the maximum duty cycle of PDCCH based on computed ABS patterns. This allows the serving eNB to control the level of interference generated to neighboring cells while maintaining acceptable throughput levels through optimized duty cycle configuration.
Data Source
AI summary
An example method for facilitating almost blank sub-frame (ABS) based orthogonal resource allocation in a wireless network environment is provided and includes receiving at a serving Evolved Universal Terrestrial Radio Access Network (E-UTRAN) nodeB (eNB), ABS patterns from a plurality of neighboring eNBs in a orthogonal frequency-division multiplexing based network, each neighboring eNB transmitting a separate ABS pattern, setting a maximum duty cycle of physical downlink control channel in a frame to be transmitted by the serving eNB within its serving cell, and computing an optimal ABS pattern at the serving eNB subject to the maximum duty cycle and based on the ABS patterns received from the plurality of neighboring eNBs. In specific embodiments, computing the optimal ABS pattern includes identifying neighboring eNBs transmitting at each sub-frame of the frame, identifying sub-frames transmitted by a least number of neighboring eNBs, and selecting each identified sub-frame for configuring as an ABS.