E-PDCCH Control Signaling Transmission for LTE Capacity
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Solution Overview
Problem
The capacity of Physical Downlink Control Channels (PDCCHs) in LTE systems is limited, especially in scenarios with multiple Radio Remote Heads sharing the same cell identifier, failing to support a large number of user equipment, and there is a lack of detailed design solutions for Enhanced PDCCH (E-PDCCH) and its cooperation with conventional PDCCH.
Innovation Solution
A method where a base station instructs user equipment to switch to an Enhanced Physical Downlink Control Channel (E-PDCCH) mode, allowing control signaling to be transmitted over resources corresponding to both the E-PDCCH and the common search space of PDCCH, with feedback mechanisms to ensure smooth switching and avoid resource conflicts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If control signaling is transmitted only over conventional PDCCH resources, then the system maintains backward compatibility with LTE R8/9/10, but the PDCCH capacity is limited and cannot support a large number of user equipment in MU-MIMO scenarios
Solution Approach 1:
The patent segments the control signaling transmission by introducing two distinct modes: conventional PDCCH mode for LTE R8/9/10 compatibility and E-PDCCH mode for enhanced capacity. The base station can selectively instruct user equipment to operate in either mode, effectively dividing the system into two operational segments that serve different functional requirements simultaneously
Solution Approach 2:
The patent adds a new dimension to control signaling transmission by introducing E-PDCCH as an additional transmission layer alongside the conventional PDCCH. This dimensional expansion allows the system to support more user equipment by utilizing both traditional and enhanced control channel resources without sacrificing backward compatibility
2Quantity of substance
If E-PDCCH mode is introduced to enhance PDCCH capacity, then more user equipment can be supported, but ambiguity arises in switching between PDCCH and E-PDCCH modes and resource conflicts may occur
Solution Approach 1:
The patent implements a feedback mechanism where user equipment sends confirmation messages to the base station after switching to E-PDCCH mode. This feedback loop allows the base station to verify the switching status and coordinate resource allocation, thereby resolving mode switching ambiguity and preventing resource conflicts between PDCCH and E-PDCCH operations
Solution Approach 2:
The patent introduces dynamic mode switching capability where the base station can flexibly instruct user equipment to switch between PDCCH and E-PDCCH modes based on current system conditions and capacity requirements. This dynamic adjustment allows the system to optimize performance while managing the complexity of dual-mode operation through centralized control
Data Source
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AI summary
Provided in an embodiment of the present invention are a control signaling transmission method, base station, terminal and system, comprising: when the terminal operates in an E-PDCCH mode, the base station may transmit a control signaling to the terminal via a resource corresponding to the E-PDCCH and a resource corresponding to common search space; that is, in the E-PDCCH mode, the control signaling transmission method on the resource corresponding to the common search space is maintained, thus providing an effective mechanism to transmit the control signaling of the terminal operating in the E-PDCCH mode.