e-PDCCH Region Configuration for Downlink Control Information Reception
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Solution Overview
Problem
Current wireless access systems face challenges in efficiently transmitting and receiving downlink control information, particularly in supporting high data transfer rates, due to limitations in the existing downlink control channel, which hinders the performance of advanced technologies like MIMO and CoMP.
Innovation Solution
The method involves receiving DCI transmission channel information from an eNB to determine whether the e-PDCCH or PDCCH is used for transmitting downlink control information, and performing blind decoding on the e-PDCCH when indicated, with the starting symbol of the e-PDCCH indexed based on PCFICH, PDCCH size, or PHICH duration, allowing correct configuration and reception of the e-PDCCH region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the existing PDCCH is used to transmit downlink control information, then the system maintains compatibility with legacy devices, but the control channel capacity is insufficient to support high data transfer rates and advanced technologies like MIMO and CoMP
Solution Approach 1:
The patent segments the control channel functionality by introducing a separate e-PDCCH channel distinct from the legacy PDCCH. This allows the system to maintain the original PDCCH for legacy device compatibility while creating a dedicated e-PDCCH resource for enhanced control information needs, effectively dividing the control channel workload to support both legacy and advanced services simultaneously
Solution Approach 2:
The patent extends the control channel into a new dimension by introducing e-PDCCH that can be multiplexed with PDSCH in the data region, rather than being confined to the traditional control region. This dimensional expansion allows control information to be transmitted alongside data, significantly increasing control channel capacity without reducing legacy PDCCH resources
2Productivity
If e-PDCCH is introduced to increase control channel capacity, then the system can support high data transfer rates, but the device complexity increases due to the need to handle both PDCCH and e-PDCCH
Solution Approach 1:
The patent implements dynamic channel selection where the UE can be flexibly configured to use either PDCCH or e-PDCCH based on network conditions and service requirements. The base station can dynamically indicate which channel to use through DCI formatting, allowing the system to adapt control channel usage in real-time rather than requiring fixed configuration, thereby managing complexity through flexibility
Solution Approach 2:
The patent uses DCI format indicators as intermediaries to manage the complexity of handling both PDCCH and e-PDCCH. By embedding channel identification information within the DCI message structure itself, the system provides a unified interface for control information transmission, allowing UEs to process both channel types through a single standardized mechanism rather than requiring separate handling procedures
3Ease of operation
If the UE performs blind decoding on e-PDCCH without knowing the starting symbol, then the UE can receive DCI, but the reception accuracy decreases due to incorrect e-PDCCH region configuration
Solution Approach 1:
The patent applies preliminary action by having the UE determine the e-PDCCH starting symbol position before performing blind decoding. The UE uses reference signals and synchronization information to pre-calculate the expected e-PDCCH region boundaries, ensuring that blind decoding is performed only within the correct time-frequency resources, thereby maintaining both ease of operation and high reception accuracy
Data Source
AI summary
Disclosed is a method of receiving downlink control information and an apparatus therefore in a wireless access system supporting an enhanced physical downlink control channel. The method includes receiving, from an eNB, DCI transmission channel information that indicates which one of a physical downlink control channel (PDCCH) and the e-PDCCH is used to transmit the DCI, checking the starting symbol of the e-PDCCH when the DCI transmission channel information indicates that the e-PDCCH is used to transmit the DCI, and receiving the DCI by performing blind decoding on the e-PDCCH from the starting symbol of the e-PDCCH.