e-PDCCH Search Space Segmentation for LTE Capacity
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing and transmitting the enhanced physical downlink control channel (e-PDCCH) in LTE networks, particularly in terms of resource allocation and interference coordination, which affects carrier aggregation and control channel capacity.
Innovation Solution
The method involves determining a search space comprising fractional portions of frequency-time resources within a physical resource block (PRB) pair for transmitting the e-PDCCH, allowing for improved resource utilization and decoding efficiency, and supporting increased control channel capacity and frequency-domain Inter Cell Interference Coordination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the search space for e-PDCCH is expanded to include more frequency-time resources, then the control channel capacity increases, but the resource allocation complexity and interference coordination difficulty increase
Solution Approach 1:
The search space for e-PDCCH is segmented into multiple candidate positions within the frequency-time grid of physical resource blocks. Instead of treating the search space as a single continuous resource pool, the patent divides it into discrete candidate locations that can be independently evaluated, thereby increasing control channel capacity while managing allocation complexity through structured segmentation
Solution Approach 2:
The patent extends the search space exploration from traditional time-domain only to include frequency-domain dimensions by examining fractional portions of frequency-time resources across multiple PRB pairs. This dimensional expansion allows the system to find additional control channel candidates in the frequency dimension, increasing capacity without proportionally increasing complexity in any single dimension
2Quantity of substance
If the search space for e-PDCCH is expanded to include more frequency-time resources, then the control channel capacity increases, but the interference from other cells increases
Solution Approach 1:
The patent applies local quality by allowing different cells to use different search space configurations and candidate positions within the frequency-time grid. Instead of uniform resource allocation across all cells, each cell can optimize its e-PDCCH search space locally, placing candidates in frequency-time regions with lower interference from neighboring cells, thereby increasing capacity while managing interference through localized adaptation
Solution Approach 2:
The patent converts the harmful effect of frequency-selective fading and interference into a benefit by identifying and exploiting frequency regions where interference is naturally lower. By expanding the search space to include fractional portions of PRB pairs and selecting candidates based on channel conditions, the system transforms interference variability into an opportunity for finding cleaner transmission regions, thereby increasing effective capacity
3Productivity
If fractional portions of PRB pairs are used for e-PDCCH search space, then resource utilization efficiency improves, but the decoding complexity increases
Solution Approach 1:
The patent segments the PRB pair resources into fractional portions that can be independently used for e-PDCCH search space. By dividing the resource block structure into smaller, manageable fractional units, the system improves resource utilization efficiency by filling gaps and using previously wasted resources, while keeping decoding complexity manageable through structured segmentation of the search candidates
Solution Approach 2:
The patent implements partial action by using only the necessary fractional portions of PRB pairs for e-PDCCH search space rather than allocating entire PRB pairs. This partial utilization approach improves resource efficiency by avoiding over-allocation, while the UE performs decoding only on the specific fractional candidates that are actually configured, thereby managing complexity by limiting decoding efforts to necessary portions rather than excessive resources
Data Source
AI summary
Aspects of the present disclosure relate generally to wireless communication systems, and more particularly, to defining a structure of and enhanced physical downlink control channel (e-PDCCH). Certain aspects provide methods and apparatus for determining a search space in which a base station (eNodeB) may transmit an enhanced physical downlink control channel (e-PDCCH), wherein the search space comprises one or more fractional portions of frequency-time resources of a physical resource block (PRB) pair, and attempting to decode the e-PDCCH based on the determined search space.