ePDCCH Position Signaling via Blank Resource Elements
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Solution Overview
Problem
In LTE-A systems, the increased number of blind detection times for terminal devices due to the enhanced Physical Downlink Control Channel (ePDCCH) results in high computational complexity, exacerbated by the lack of signaling for regular blank Resource Elements (REs) in the PDCCH design.
Innovation Solution
Configuring ePDCCH by utilizing blank resource elements for new signaling, which includes determining ePDCCH position indication information and carrying it onto unused resource elements, thereby reducing the number of blind detection times and computational complexity at the terminal device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If blind detection is performed throughout the search space for ePDCCH, then the terminal device can locate the ePDCCH position, but the number of blind detection times increases and computational complexity increases
Solution Approach 1:
The base station performs preliminary action by signaling the ePDCCH position indication information to the terminal device before the terminal needs to detect the ePDCCH. This preliminary signaling allows the terminal to skip unnecessary blind detection operations, directly reducing the number of detection times and computational complexity while maintaining reliable ePDCCH detection.
2Device complexity
If blank resource elements are left unused in ePDCCH, then the channel structure remains simple, but resource utilization efficiency decreases
Solution Approach 1:
The blank resource elements are given multi-functionality by using them to carry ePDCCH position indication information. This transforms previously unused resources into functional signaling elements, improving resource utilization efficiency without significantly increasing channel structure complexity, as the same physical resources are repurposed rather than adding new structural components.
3Adaptability or versatility
If ePDCCH position is not signaled, then the base station has scheduling flexibility, but the terminal device must perform extensive blind detection
Solution Approach 1:
The ePDCCH position indication information acts as an intermediary between the base station's scheduling decisions and the terminal device's detection process. This intermediary signaling mechanism allows the base station to maintain scheduling flexibility while providing the terminal with the necessary position information to reduce detection time and computational overhead.
Data Source
AI summary
A communications system includes a base station device and a terminal device. The base station device configures an enhanced Physical Downlink Control Channel (ePDCCH), comprising: circuitry, configured to determine ePDCCH position indication information adapted to indicate a position of the ePDCCH in a terminal device search space based on configuration of Demodulation Reference Signal, wherein ePDCCH comprises control information of the terminal device and is aggregated by a number of enhanced control channel elements, each enhanced control channel element consisting of a set of resource elements; and generate a signaling comprising the ePDCCH position indication information for the terminal device.