Non-Scheduled Data Transmission Reducing PDCCH Blind Detection
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Solution Overview
Problem
High-speed data transmission in communication equipment leads to increased cost and complexity due to full spectrum band blind detection in each subframe, resulting in high PDCCH blind detection frequencies exceeding 40 times.
Innovation Solution
The method involves a communication equipment receiving a time-frequency resource and corresponding relationship between physical random access feedback and access channels from a base station, sending a preamble, performing synchronization through timing advance, and establishing an RRC connection in a non-scheduled manner, reducing the need for full spectrum band detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If full spectrum band blind detection is performed in each subframe, then data transmission reliability is improved, but device complexity and cost increase significantly
Solution Approach 1:
The patent segments the spectrum band into specific resource blocks (6 central PRBs) where synchronization signals and broadcast channels are located. Instead of monitoring the full spectrum band, the communication equipment only needs to perform blind detection on these segmented, predetermined resource blocks, significantly reducing the number of blind detections from over 40 times to a manageable number while maintaining reliable data transmission.
Solution Approach 2:
The base station performs preliminary actions by pre-configuring and broadcasting system information including PHICH resource configuration, PBCH location, and PDCCH monitoring parameters before data transmission begins. The communication equipment uses this pre-provided information to directly access the necessary resources without performing extensive blind detection, thereby reducing complexity while ensuring reliable communication.
2Reliability
If PDCCH blind detection is performed over full spectrum band, then data transmission completeness is improved, but cost and complexity increase
Solution Approach 1:
The patent divides the frequency spectrum into specific resource blocks (6 central PRBs) that contain all necessary synchronization and broadcast information. The communication equipment is designed to only monitor these segmented resource blocks rather than the entire spectrum band, reducing the number of blind detections from over 40 times to a small fixed number, thereby lowering hardware complexity and manufacturing cost while maintaining complete data transmission capability.
Solution Approach 2:
The base station copies essential system information (PHICH configuration, PBCH location, PDCCH parameters) to all communication equipment through broadcast channels. Each communication equipment receives this copied information and uses it directly for communication, eliminating the need for each device to independently search the entire spectrum band, thus reducing manufacturing cost while ensuring complete data reception.
3Productivity
If high-speed data transmission is implemented, then communication efficiency is improved, but blind detection frequency increases to over 40 times
Solution Approach 1:
The base station performs preliminary actions by broadcasting system information including PHICH resource configuration, PBCH location, and PDCCH monitoring parameters before high-speed data transmission begins. This allows communication equipment to directly access predetermined resource blocks without performing extensive blind detection, maintaining high communication efficiency while reducing blind detection frequency from over 40 times to a manageable number.
Solution Approach 2:
The patent segments the spectrum into specific resource blocks (6 central PRBs) containing all necessary control and broadcast information. This segmentation enables high-speed data transmission by allowing communication equipment to quickly locate and access the required resources without searching the entire spectrum band, thereby maintaining high productivity while reducing the number of blind detections required.
Data Source
AI summary
The present invention discloses a method and a device for transmitting data. The method includes: sending, by a base station, a time-frequency resource on which a communication equipment sends any one preamble to the base station on a physical random access channel and corresponding relationship between a physical random access feedback channel and a physical random access channel to a user equipment on a downlink resource through system broadcast; sending, by the communication equipment, any one preamble to the base station on the time-frequency resource, receiving random access feedback information sent by the base station, performing synchronization with the base station through a TA carried in the random access feedback information, sending an RRC connection request message to the base station on the time-frequency resource biased with a preset time, receiving an RRC establishment message sent by the base station, and then establishing an RRC connection with the base station.