eNodeB DwPTS Control Information Transmission
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Solution Overview
Problem
In conventional OFDM-TDD communication systems, control and scheduling information that cannot be beamformed is transmitted together with service data in a downlink service slot, increasing processing complexity for the transmitter and reducing time-frequency transmission efficiency due to wasted resources.
Innovation Solution
The eNodeB transmits control and scheduling information that cannot be beamformed in the DwPTS, either by multiplying it with downlink pilot information or mapping it to the whole DwPTS, depending on cell bandwidth, to utilize available frequency resources and reduce processing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If control and scheduling information is transmitted together with service data in a downlink service slot, then the transmitter can use the same time resources, but the processing complexity of the transmitter increases and time-frequency transmission efficiency decreases
Solution Approach 1:
The patent segments the transmission resources by separating control and scheduling information from service data, placing them in different time slots. The control information is transmitted in DwPTS (Downlink Pilot Time Slot) while service data is transmitted in downlink service slots, thereby simplifying transmitter processing and improving time-frequency transmission efficiency by avoiding the complexity of joint processing in the same slot.
2Productivity
If control and scheduling information is transmitted in DwPTS, then time-frequency transmission efficiency is improved, but the receiver needs to process information from different slots
Solution Approach 1:
The patent applies preliminary action by transmitting control and scheduling information in DwPTS before the actual service data transmission. This allows the receiver to obtain necessary control information (such as resource allocation, modulation schemes) in advance, which is required for properly receiving and decoding the subsequent service data in downlink service slots, thereby reducing receiver processing complexity despite the segmented transmission.
3Reliability
If first type control information is transmitted at the foremost end of the subframe, then the UE can receive it in advance, but the receiver needs to accomplish demodulation and decoding in a very short period
Solution Approach 1:
The patent resolves this contradiction by changing the time dimension arrangement - instead of placing all control information at the foremost end of the subframe, it moves the first type control information to a separate earlier slot (DwPTS). This temporal separation gives the receiver adequate processing time while ensuring reliable reception, as the control information is received and processed in one slot before the data transmission begins in subsequent slots.
Data Source
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Figure 5A~5B
AI summary
The present invention discloses a method for transmitting control and scheduling information. The method comprises an eNodeB transmitting control and scheduling information unable to be beamformed in a DwPTS. The control and scheduling information unable to be beamformed is switched from the downlink service slot to the DwPTS and then transmitted, so that the efficiency of time and frequency transmission is improved, the design complexity of the transmitter is reduced, the capacity of the radio access system may be improved and the design of the receiver may be simplified. The present invention also discloses a NodeB.