ePCFICH Mapping to PHICH for Flexible ePDCCH Resource Indication
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Solution Overview
Problem
The existing LTE and LTE-Advanced systems lack a flexible method to indicate downlink control channel resources, such as subframes and component carriers, which limits network efficiency and resource utilization.
Innovation Solution
Configuring an enhanced physical control format indicator channel (ePCFICH) to indicate the resources for transmitting an enhanced physical downlink control channel (ePDCCH) and transmitting this information via the physical hybrid automatic repeat request (HARQ) indicator channel (PHICH) to communication devices, allowing for dynamic and flexible resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the downlink control channel location is fixed, then the system structure is simple and easy to implement, but the network cannot flexibly indicate various resources of subframes, component carriers or configurations
Solution Approach 1:
The patent merges the ePCFICH (enhanced Physical Control Format Indicator Channel) with the PHICH (Physical HARQ Indicator Channel) by mapping ePCFICH bits onto PHICH resources. This combination allows the system to indicate ePDCCH resources flexibly while utilizing existing PHICH infrastructure, thereby improving adaptability without proportionally increasing complexity
Solution Approach 2:
The PHICH is made multi-functional by using it to carry both its original HARQ indicator function and the new ePCFICH function for indicating ePDCCH resources. This universal usage of existing channel resources enables flexible resource indication while avoiding the need to create entirely new signaling mechanisms
2Reliability
If distributed ePDCCH resources are used, then coverage and reliability are improved, but resource wastage increases
Solution Approach 1:
The patent introduces dynamic configuration of ePDCCH resources through ePCFICH signaling. The network can dynamically adjust the number and location of ePDCCH resource blocks based on actual traffic conditions and user requirements, allowing the system to switch between distributed and localized resource allocation modes as needed, thereby maintaining reliability while reducing resource wastage
Solution Approach 2:
The system changes the parameter of ePDCCH resource allocation from fixed to variable by introducing ePCFICH indicators that specify the actual resource configuration. This allows the network to optimize resource usage by adjusting allocation parameters dynamically, reducing waste while maintaining the reliability benefits of distributed allocation when necessary
Data Source
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AI summary
A method of indicating a downlink (DL) control channel for a network of a wireless communication system method comprises configuring an enhanced physical control format indicator channel (ePCFICH) according to an amount of resource for transmitting an enhanced physical DL control channel (ePDCCH) of a subframe, wherein the ePDCCH is dedicated to a communication device of the wireless communication system or to a group to which the communication device belongs; and transmitting the ePCFICH to the communication device via a plurality of bits of a physical hybrid automatic repeat request (HARQ) indicator channel (PHICH) of the subframe, to indicate the amount of resource for transmitting the ePDCCH to the communication device.