EPDCCH Stand-Alone Operation via EPCFICH Dynamic Indicators
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Solution Overview
Problem
The 3GPP LTE Release 11 system lacks support for stand-alone operation of the enhanced physical downlink control channel (EPDCCH) without legacy PDCCH, particularly in new carrier type (NCT) scenarios, where no common search space is defined for EPDCCH, hindering efficient data channel scheduling.
Innovation Solution
The introduction of an enhanced physical control format indicator channel (EPCFICH) dynamically indicates the location of a common EPDCCH set, allowing for stand-alone operation by decoding a dynamic indicator channel to determine radio resources and obtain scheduling information for data channels, enabling enhanced common search space support without RRC or higher layer signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If EPDCCH is used without legacy PDCCH for stand-alone operation, then control channel capacity and spatial reuse are improved, but the system lacks defined common search space for scheduling common control messages
Solution Approach 1:
The patent segments the control channel functionality by defining a separate enhanced common search space (ECSS) within the EPDCCH structure, distinct from the enhanced UE-specific search space (EUSS). This segmentation allows the EPDCCH to independently handle common control messages without requiring legacy PDCCH, enabling stand-alone operation while maintaining the improved control channel capacity of EPDCCH.
Solution Approach 2:
The patent introduces an intermediary mechanism (ECSS with dynamic indicator channel) that bridges the gap between EPDCCH's enhanced capabilities and the need for common control message scheduling. This intermediary structure allows UEs to acquire scheduling information for common control messages directly through EPDCCH, eliminating the dependency on legacy PDCCH while maintaining system compatibility.
2Loss of energy
If all control signaling is transmitted in EPDCCH for stand-alone NCT, then traffic load in primary cell is reduced, but configuration complexity increases without RRC or higher layer signaling
Solution Approach 1:
The patent implements a self-service mechanism where the ECSS is automatically configured and activated without requiring explicit RRC or higher layer signaling. The system uses predefined rules and parameters that allow UEs to autonomously acquire the common search space configuration, reducing configuration complexity while enabling all control signaling to be transmitted in EPDCCH, thereby reducing traffic load in the primary cell.
Solution Approach 2:
The patent changes the operational parameters of the control channel by introducing dynamic indicator channels that convey scheduling information for common control messages directly through EPDCCH. This parameter change eliminates the need for separate configuration signaling, reducing both traffic load and configuration complexity while maintaining full functionality for stand-alone NCT operation.
3Productivity
If enhanced common search space is supported without RRC signaling, then operation efficiency is improved, but resource allocation flexibility may be reduced
Solution Approach 1:
The patent introduces dynamic indicator channels within the ECSS that enable flexible resource allocation for common control messages. This dynamic mechanism allows the system to efficiently allocate resources on-demand based on actual traffic needs, maintaining operation efficiency while preserving resource allocation flexibility. The dynamic indicators can be adjusted without requiring complex RRC signaling, achieving a balance between efficiency and adaptability.
Data Source
AI summary
A method includes: determining a first set of radio resources by decoding a dynamic indicator channel, wherein the dynamic indicator channel indicates a location of the first set of radio resources detecting a physical control channel in the determined first set of radio resources; and obtaining scheduling information of a data channel that carries a message from the decoded physical control channel.