TD-SCDMA Frame Structure Adjustment for Transmission Delay Reduction
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Solution Overview
Problem
In TD-SCDMA mobile communication systems, the transmission delay is excessively long due to the fixed structure of time slots, leading to inefficient data transmission and reduced call throughput.
Innovation Solution
The method involves adjusting the frame structure by adding more guard periods and using time slots as the minimum unit for the transmission time interval, allowing for flexible configuration of service time slots and guard periods to reduce acknowledgement time and transmission delay, while also enabling intermittent transmission of downlink pilot and uplink synchronization information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the fixed frame structure with two switching points per sub frame is used, then the system maintains stability and synchronization, but the transmission delay becomes excessively long
Solution Approach 1:
The patent applies dynamics by making the frame structure flexible and adjustable. The number of switching points between downlink and uplink time slots is no longer fixed at two per sub frame, but can be dynamically configured based on service requirements. This allows the system to optimize transmission delay by increasing switching frequency when needed, while maintaining stability when using standard configurations.
Solution Approach 2:
The patent changes the parameter of switching point quantity from a fixed value (2 per sub frame) to a configurable parameter. By allowing the number of switching points to vary according to different service scenarios, the system can adjust transmission characteristics to reduce delay for time-sensitive services while maintaining robustness for other applications.
2Productivity
If more switching points are added to reduce acknowledgement time, then the transmission delay decreases, but the system complexity increases
Solution Approach 1:
The patent implements dynamic configuration of time slots and switching points based on service requirements. Rather than permanently increasing system complexity through fixed additional switching points, the system dynamically adjusts the number and position of switching points to achieve higher call throughput when needed, while maintaining simpler operation during standard conditions.
3Loss of time
If the transmission time interval unit is reduced to time slot level, then the transmission delay is reduced, but the frame structure becomes more complex
Solution Approach 1:
The patent applies segmentation by dividing the radio frame into smaller, more granular time slot units that can be independently configured. By using time slots as the basic unit for transmission time interval and allowing flexible arrangement of switching points within these segments, the system reduces acknowledgement time while managing complexity through structured segmentation rather than unstructured fine-grained control.
Data Source
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AI summary
A method for a time division duplex mobile communication system comprises that setting a minimum unit of transmission time interval and a system frame structure, wherein each radio sub frame is composed of a downlink pilot time slot, a switching guard period, a synchronization time slot and a plurality of service time slots, and the transmission time interval uses the length of time slot as a unit; a user obtaining downlink synchronization by receiving downlink pilot information of the downlink pilot time slot, and obtaining corresponding configuration information of cell by reading cell broadcasting information, and then transmitting uplink synchronization information in the synchronization time slot to fulfill a random access process, wherein the configuration information includes transmission time interval and system frame structure information; the network side/ the user transmitting call information to an opposite end, and the opposite end processing call acknowledgement according to the transmission time interval; the network side allocating a channel for the user, wherein the network side and the user communicates through the allocated channel. The method reduces data transmission delay during communication, improves call throughout.