e-PDCCH Allocation via e-PCFICH Position Indication
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face challenges in efficiently allocating a downlink control channel in multi-node systems, leading to increased complexity for user equipment to detect control channels, especially with the introduction of distributed multi-node systems and advanced MIMO techniques.
Innovation Solution
The introduction of an enhanced physical control format indicator channel (e-PCFICH) that indicates position information for a new downlink control channel, known as the e-PDCCH, to minimize complexity for user equipment detection and support multiple nodes in a multi-node system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a new downlink control channel (e-PDCCH) is introduced to support multiple nodes in a multi-node system, then the capacity and reliability of downlink control channel transmission is improved, but the complexity of blind decoding for user equipment increases
Solution Approach 1:
The patent introduces an enhanced physical control format indicator channel (e-PCFICH) as an intermediary element that carries position information about the e-PDCCH. This intermediary channel helps user equipment locate the control channel without requiring extensive blind decoding across the entire frequency band, thus maintaining reliability while reducing decoding complexity.
Solution Approach 2:
The e-PCFICH is transmitted before the e-PDCCH to provide advance position information. By performing this preliminary action of indicating the control channel location, the system allows user equipment to directly navigate to the e-PDCCH position without exhaustive searching, thereby reducing blind decoding complexity while ensuring reliable control channel delivery.
2Quantity of substance
If distributed multi-node systems are deployed to increase data capacity, then the data capacity within limited frequency is improved, but the complexity of control channel allocation increases
Solution Approach 1:
The patent divides the control channel allocation into separate components: the e-PCFICH for position indication and the e-PDCCH for actual control data. This segmentation allows each component to be optimized independently, enabling distributed multi-node systems to increase data capacity while keeping control channel allocation complexity manageable through structured division of functions.
3Productivity
If an enhanced physical control format indicator channel (e-PCFICH) is introduced to indicate position information, then the detection efficiency for user equipment is improved, but the device complexity increases
Solution Approach 1:
The e-PCFICH serves multiple functions: it indicates the position of the e-PDCCH, enables efficient detection by user equipment, and supports distributed multi-node systems. By designing this single element to perform multiple functions, the patent improves detection efficiency without requiring additional separate mechanisms, thereby limiting the increase in overall device complexity.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Provided is a method and apparatus for allocating a downlink control channel in a wireless communication system. A base station allocates at least one control channel element (CCE), which contains a plurality of resource elements (REs), in a data region of one resource block (RB), allocates an enhanced physical downlink control channel (e-PDCCH) corresponding to said at least one CCE, and transmits a downlink control signal through the allocated e-PDCCH.