Microwave Device CPRI Frame Timeslot Stabilization
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Solution Overview
Problem
Current systems face reduced frequency spectrum utilization and increased microwave signal bandwidth requirements due to bit transparent transmission of CPRI frames, leading to large fluctuations in MSE curves and decreased system performance, especially in ROR/AROF systems where uplink-downlink handover timeslots are not learned, causing AGC gain fluctuations.
Innovation Solution
A method where a microwave device determines timeslots without antenna-carrier I/Q data, writes a preset synchronization sequence and random numbers to generate a second A×C with improved power, and combines it with I/Q data in a time division multiplexing manner to stabilize AGC gain and reduce MSE curve fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If bit transparent transmission manner is used for CPRI frame, then transmission simplicity is maintained, but microwave signal bandwidth increases rapidly and frequency spectrum utilization decreases
Solution Approach 1:
The patent extracts the antenna-carrier I/Q data from the CPRI frame and performs separate analogue transmission on this extracted data using microwave signals. This separation allows the control word to be transmitted digitally while the radio signal information is transmitted analogously, reducing the overall microwave bandwidth requirement compared to transmitting the entire CPRI frame in bit transparent manner.
Solution Approach 2:
The patent combines digital transmission of control word with analogue transmission of antenna-carrier I/Q data into a unified transmission system. The control word and radio signal information are merged at the transmit end and recombined at the receive end, allowing efficient utilization of microwave spectrum while maintaining transmission simplicity.
2Quantity of substance
If ROR/AROF system performs analogue transmission on antenna-carrier I/Q data, then frequency spectrum utilization increases, but AGC gain fluctuates sharply and MSE curve jitter increases
Solution Approach 1:
The patent applies preliminary action by having the transmit end write a preset synchronization sequence and preset channel estimate into the timeslot before transmitting the antenna-carrier I/Q data. This preliminary preparation ensures that the receive end has reference information available before the actual data transmission begins, enabling stable AGC gain control and preventing sharp fluctuations when I/Q data is present or absent.
Solution Approach 2:
The patent implements feedback mechanisms where the transmit end writes preset channel estimates and the receive end uses these estimates for coherent detection. This feedback loop allows the system to adapt to channel conditions and maintain stable AGC gain, reducing MSE curve jitter while preserving the benefits of analogue transmission.
3Stability of the object's composition
If transmit end writes preset synchronization sequence and channel estimate in timeslot, then power consistency improves and AGC stability increases, but device complexity increases
Solution Approach 1:
The patent applies parameter changes by modifying the timeslot structure to include preset synchronization sequences and channel estimates at specific positions. These parameter changes are standardized and predetermined, allowing the transmit end to write fixed patterns rather than performing complex real-time processing. The receive end uses these predetermined parameters for coherent detection, achieving power consistency without significant increase in device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach stabilizes the AGC gain and reduces MSE curve fluctuations, enhancing system performance by improving power consistency and frequency spectrum utilization.
Implementation Method 1
modulating, by the first microwave device, the CW to obtain in-phase/quadrature I/Q data of the CW
Implementation Method 2
sending the microwave air interface frame by using a microwave air interface
Data Source
AI summary
Embodiments of the present invention provide a data sending and receiving method, an apparatus, and a system. The method can be executed by a microwave device, which includes: obtaining a control word (CW) and a first antenna-carrier (A×C) from a common public radio interface (CPRI) frame; modulating the CW to obtain in-phase/quadrature (I/Q) data of the CW; determining a first timeslot in which the first A×C does not carry antenna-carrier I/Q data; writing a preset synchronization sequence, first information, and a random number in the first timeslot to generate a second A×C; and combining the second A×C with the I/Q data of the CW to generate a microwave air interface frame, and sending the microwave air interface frame in a time division multiplexing manner.