LTE-A Control Information Transmission via PDCCH and ePDCCH Segmentation
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Solution Overview
Problem
In LTE-A systems, the inability to send an ePDCCH in certain subframes, such as MBSFN or special TDD subframes, prevents uplink/downlink scheduling and downlink feedback for user equipment, leading to inefficiencies in resource allocation and data transmission.
Innovation Solution
A method where a network device sends control information through a PDCCH in a subframe with a control region and an ePDCCH in a subsequent subframe, allowing for uplink/downlink scheduling and feedback by determining specific subframes within a radio frame and using dedicated signaling to indicate the position of these subframes to user equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If ePDCCH is used for control information transmission in LTE-A systems, then resource allocation efficiency is improved, but scheduling cannot be implemented in MBSFN or special TDD subframes
Solution Approach 1:
The patent segments control information transmission into two parts: PDCCH in normal subframes for basic scheduling, and ePDCCH in other subframes for enhanced scheduling. This segmentation allows PDCCH to maintain scheduling capability in MBSFN and special TDD subframes where ePDCCH cannot operate, while ePDCCH handles control information in subframes where it can be transmitted.
Solution Approach 2:
The patent makes the control region universal by allowing it to serve multiple functions: traditional PDCCH transmission for backward compatibility and scheduling in normal subframes, and ePDCCH transmission for enhanced scheduling capabilities. The control region can dynamically adapt to different transmission modes based on subframe type and service requirements.
2Loss of energy
If control region is removed from NCT to improve energy efficiency, then base station energy consumption is reduced, but uplink/downlink scheduling and downlink feedback cannot be implemented
Solution Approach 1:
The patent performs preliminary action by transmitting control information related to MBSFN or special TDD subframes in advance through PDCCH in normal subframes. This allows the control region to be removed from NCT while maintaining scheduling and feedback capabilities through提前 transmitted control information.
Solution Approach 2:
The patent introduces PDCCH in normal subframes as an intermediary to transmit control information that enables scheduling and feedback operations in MBSFN or special TDD subframes where the control region is absent. This intermediary mechanism bridges the gap between energy efficiency goals and functional requirements.
3Ease of operation
If PDCCH is used for control information transmission, then scheduling capability is maintained, but control region occupation reduces data transmission resources
Solution Approach 1:
The patent extracts ePDCCH functionality from the traditional control region and places it in the data region of subframes. This extraction reduces control region occupation in normal subframes, freeing up resources for data transmission, while maintaining scheduling capability through PDCCH where necessary.
Solution Approach 2:
The patent moves control information transmission from the time-domain control region to the frequency-domain data region by utilizing resource blocks in the data area for ePDCCH transmission. This dimensional shift allows control and data transmissions to coexist more efficiently in the same subframe.
Data Source
AI summary
A control information sending method, receiving method, and device are provided. The control information sending method includes: determining a first subframe of a first radio frame on a first carrier, where the first subframe includes a control region; sending control information in the control region of the first subframe of the first radio frame to a user equipment, where the control information includes a PDCCH; and sending an ePDCCH in a second subframe of the first radio frame to the user equipment. According to the embodiments of the present invention, when control information borne on an ePDCCH cannot be sent in a first radio frame, a PDCCH can still be sent to a user equipment through a control region in a first subframe, thereby achieving purposes of performing uplink/downlink scheduling for the user equipment and downlink feedback for uplink data of the user equipment.