Multi-Antenna TDD Uplink Time Slot Segmentation
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Solution Overview
Problem
In multi-antenna multi-user time division duplex (TDD) wireless communication systems, existing power control methods require wide-range power adjustment, increasing terminal costs, and existing frequency synchronization methods lead to high collision probabilities due to strict frequency and sub-channel requirements.
Innovation Solution
The method classifies uplink time slots based on synchronization signal received power, allowing terminals to adjust power within a smaller range and randomly select transmission frequencies, using narrow-band single-carrier modulation and FFT for quick channel estimation and beamforming to reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing power control technology is used to achieve similar received power at the base station, then the terminal can adjust transmission power substantially, but the terminal requires wide range power adjustment capability which significantly increases terminal cost
Solution Approach 1:
The uplink time slots are segmented into multiple groups based on synchronization signal received power ranges. Terminals are assigned to specific time slot groups according to their received power levels, which divides the wide power adjustment range into smaller, manageable segments. This reduces the power adjustment capability requirement for individual terminals while maintaining overall received power similarity at the base station.
2Productivity
If the terminal sends pilot signal and synchronization sequence on specified frequency and sub-channel, then the base station can quickly identify the transmitting terminal and perform channel estimation, but very accurate frequency synchronization is demanded and collision probability increases
Solution Approach 1:
The patent introduces a new dimension for terminal identification by using time slot group assignment based on synchronization signal received power. Instead of relying solely on frequency and sub-channel specifications, terminals are differentiated through their assigned time slot groups. This dimensional addition allows the base station to identify terminals and perform channel estimation without requiring very accurate frequency synchronization, thereby reducing collision probability.
Data Source
AI summary
Disclosed in the present invention is a signal transmission method for a multi-antenna multi-user TDD communication system. Each frame of the TDD communication system includes one forward downlink frame synchronization signal, multiple downlink data time slots, and multiple uplink data time slots; the downlink frame synchronization signal is a broadcast signal, the base station sends the downlink frame synchronization signal to all terminals, and after each terminal receives the downlink frame synchronization signal, time and frequency synchronization is performed with reference to the base station to acquire the start time and end time of each uplink data time slot. The synchronization signal received power P is evaluated and compared with the synchronization signal received power range of all uplink data time slots in the frame, and all terminals falling into the synchronization signal received power range of the uplink data time slot k select the uplink data time slot k to send data.