Multi-slot CDMA Time Slot Combination for High Data Rate Transmission
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Solution Overview
Problem
Current CDMA TDD systems face limitations in data transmission rate, user terminal complexity, and cell coverage due to high power consumption and puncturing ratios, making it difficult to support higher data rates and efficient multi-user detection.
Innovation Solution
Combining multiple neighboring time slots into larger time slots with adjustable midambles and higher order modulation modes to increase data transmission rates while reducing the number of code channels and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple code channels or lower spreading factor are used to increase transmission rate, then transmission rate is improved, but terminal transmitting power increases and cell coverage decreases
Solution Approach 1:
The patent combines multiple time slots into a single extended time slot, allowing data to be transmitted across multiple slots using a single code channel. This merging approach maintains transmission rate while reducing the need for multiple code channels, thereby lowering terminal power consumption and extending cell coverage.
Solution Approach 2:
The patent introduces dynamic time slot combination where the number of combined slots can be flexibly adjusted based on service requirements. This dynamic approach allows the system to adapt transmission resources to actual needs, improving efficiency while controlling power consumption.
2Productivity
If multiple time slots are used to increase transmission rate, then transmission rate is improved, but user terminal complexity increases due to multiple demodulators
Solution Approach 1:
By merging multiple time slots into one extended slot and using a single code channel for transmission across them, the patent eliminates the need for multiple demodulators in the terminal. The receiver processes all combined slots through one demodulation chain, significantly reducing terminal complexity while maintaining high transmission rates.
Solution Approach 2:
The single code channel and demodulator are designed to handle multiple combined time slots universally, making the terminal structure more versatile. One demodulator can process data from any number of combined slots, reducing the need for dedicated hardware for each slot.
3Adaptability or versatility
If higher transmission rate services are supported, then service capability is improved, but one carrier frequency can only provide one-way transmission
Solution Approach 1:
The patent segments the extended time slot into multiple original time slot units that can be independently configured. This segmentation allows flexible allocation of resources for different directions (uplink/downlink) while maintaining the overall high-rate transmission capability, enabling better carrier utilization for bidirectional services.
Data Source
AI summary
The present invention discloses a method for improving the performance of the CDMA TDD wireless communication system. It is a method for increasing the transmission rate in a multi-slot CDMA system. The method comprises combining a plurality of neighboring time slots to form a combined time slot with a length of integer times of the length of the original time slot, wherein the modulation modes adopted by the combined time slot are not limited, and transmitting traffic data with at least one service data field in the combined time slot, and using the guard period in the combined time slot for guard between combined time slots.