Dynamic TDD Configuration for Uplink Latency Reduction
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Solution Overview
Problem
The Time Division Duplex (TDD) arrangement in wireless communication systems limits throughput and introduces uplink communication latency, which is particularly problematic for latency-sensitive communications like voice-over-packet calls, as it restricts data transmission to specific subframes and introduces delays.
Innovation Solution
A method for dynamically configuring a cell's TDD configuration to reduce uplink latency by selecting a configuration with lower average wait times to uplink subframes, based on real-time conditions such as the number of voice-over-packet calls and channel quality, allowing for more efficient data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If TDD configuration uses fixed recurring sequence of downlink and uplink time segments, then system operation is simplified and stable, but uplink latency increases and throughput is limited
Solution Approach 1:
The patent applies dynamics by enabling the base station to dynamically select between multiple TDD configurations (0-6) based on real-time uplink latency requirements. Instead of using a fixed TDD configuration, the system adapts the configuration pattern dynamically, allowing the uplink-downlink time segment sequence to change according to current network conditions and service requirements, thereby reducing uplink latency while maintaining operational stability.
2Productivity
If TDD carrier multiplexes downlink and uplink over time in specific intervals, then frequency channel utilization is improved, but data transmission is restricted and latency increases
Solution Approach 1:
The patent applies parameter changes by modifying the TDD configuration parameters (specifically the pattern of downlink and uplink subframes) based on uplink latency requirements. The base station selects from multiple predefined TDD configurations (0-6), each with different uplink subframe densities and positions, thereby changing the time multiplexing parameters to optimize both frequency channel utilization and data transmission speed according to current service demands.
3Productivity
If wider carrier frequency bandwidth is defined to offset throughput limitation, then data transmission capacity per subframe increases, but uplink latency remains problematic
Solution Approach 1:
The patent applies preliminary action by proactively selecting appropriate TDD configurations before uplink latency becomes critical. The base station monitors uplink latency requirements and service patterns, and in advance selects a TDD configuration that provides sufficient uplink transmission opportunities, thereby preventing latency accumulation rather than reacting to it. This proactive configuration selection ensures both adequate data transmission capacity and acceptable uplink latency.
Data Source
AI summary
Disclosed is a method and system for controlling air interface communication in a wireless communication system that supports multiple TDD configurations. In a disclosed example, a base station's cell is initially configured to operate with a particular TDD configuration. The base station then detects a trigger to reduce uplink latency in the cell, such as by detecting a threshold number of devices being served with latency-sensitive communication such as voice-over-packet communication. And the base station responsively reconfigures the cell to operate with a different TDD configuration having lower uplink latency, where uplink latency of each TDD configuration is based average wait to uplink subframe of the TDD configuration.