TDD Radio Frame Configuration for Latency Reduction
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Solution Overview
Problem
Current time division duplex (TDD) communication systems face challenges in reducing round-trip latency (RTT) and improving data transmission efficiency, as existing methods are ineffective in minimizing the time interval for uplink/downlink switching.
Innovation Solution
The method involves configuring radio frames to split uplink and downlink subframes into shorter durations, allowing for simultaneous uplink and downlink service transmission in the same subframe, thereby reducing waiting intervals and shortening RTT by enabling feedback transmission in the same subframe.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data scheduling is performed in a hybrid automatic repeat request (HARQ) manner with preset maximum feedback latency, then system reliability is improved, but round-trip latency (RTT) increases and data transmission efficiency deteriorates
Solution Approach 1:
The patent segments the radio frame into multiple subframes with different configurations. By dividing the frame structure and allowing flexible assignment of subframes for uplink or downlink, the system can optimize the timing of data transmission and feedback reception, thereby reducing round-trip latency while maintaining HARQ reliability through proper segmentation of transmission and feedback intervals.
Solution Approach 2:
The patent implements dynamic TDD configuration where the base station can flexibly adjust the direction (uplink or downlink) of each subframe based on real-time traffic conditions. This dynamic adaptation allows the system to minimize feedback latency by strategically positioning uplink subframes closer to downlink subframes, thus reducing RTT while maintaining the reliability of HARQ through adaptive scheduling.
2Productivity
If the time interval for uplink/downlink switching is reduced, then data transmission efficiency is improved, but system complexity increases
Solution Approach 1:
The patent employs periodic switching between uplink and downlink subframes within the radio frame structure. By organizing the flexible TDD configuration into periodic patterns, the system achieves frequent uplink/downlink switching to improve transmission efficiency while maintaining manageable system complexity through structured, repeating sequences that simplify scheduling and resource management.
Data Source
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AI summary
The present invention provides a communication method in a time division duplex system, a base station, and user equipment, so as to effectively reduce an RTT and improve data transmission efficiency. The method includes: determining, by a base station, radio frame configuration information; sending, by the base station, the determined radio frame configuration information to user equipment UE, where the radio frame configuration information is used to instruct the UE to set at least one of N consecutive downlink subframes of one radio frame as a first subframe, and/or the radio frame configuration information is used to instruct the UE to set at least one of M consecutive uplink subframes of one radio frame as a second subframe, where the first subframe is used for uplink service transmission, the second subframe is used for downlink service transmission, and N and M are positive integers not less than 2; and communicating, by the base station, with the UE by using a radio frame configured according to the radio frame configuration information.