Configured Uplink Transmission Control via Semi-Static TDD Patterns
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Solution Overview
Problem
Current solutions for configured uplink transmissions in cellular communications systems face limitations, including restricted provision of slot format information and increased congestion due to frequent dynamic trigger messages, leading to degradation in uplink throughput and latency issues.
Innovation Solution
A method where a wireless communication device receives a configuration parameter to determine whether configured uplink or downlink transmissions are allowed based on a semi-static TDD configuration or absence of a DCI format, allowing flexible operation and reducing unnecessary transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dynamic trigger messages are used frequently to control configured uplink transmissions, then transmission control flexibility is improved, but network congestion increases and uplink throughput degrades
Solution Approach 1:
The patent introduces a semi-static TDD configuration that periodically defines flexible symbols for configured uplink transmissions, replacing the need for frequent dynamic trigger messages. This periodic structure allows the system to maintain transmission control flexibility while reducing the overhead of continuous dynamic signaling, thereby improving uplink throughput by reducing network congestion.
Solution Approach 2:
The patent pre-configures semi-static TDD patterns and flexible symbol indications in advance, so that configured uplink transmissions can occur without waiting for dynamic trigger messages. This preliminary action enables transmissions during flexible symbols even without real-time dynamic triggers, reducing latency and improving throughput while maintaining control flexibility through the pre-established configuration.
2Measurement precision
If dynamic trigger messages are sent frequently to control configured uplink transmissions, then transmission control precision is improved, but latency increases
Solution Approach 1:
The patent pre-configures semi-static TDD patterns, flexible symbol indications, and configured uplink transmission parameters in advance through RRC signaling. This preliminary configuration allows the UE to perform transmissions immediately when conditions are met, without waiting for dynamic trigger messages, thereby reducing latency while maintaining control precision through the pre-established configuration rules.
Solution Approach 2:
The patent enables the UE to autonomously determine when to perform configured uplink transmissions by checking local configuration parameters and conditions (such as whether the current symbol is a flexible symbol and whether uplink transmissions are allowed). This self-service mechanism eliminates the need for continuous dynamic triggering, reducing latency while maintaining precise control through the UE's autonomous decision-making based on pre-configured parameters.
3Productivity
If semi-static TDD configuration is used to allow configured transmissions without dynamic triggers, then network congestion is reduced, but transmission control flexibility decreases
Solution Approach 1:
The patent introduces a parameter that can be dynamically changed through MAC CE signaling to control whether configured uplink transmissions are allowed in flexible symbols. This creates a dynamic control mechanism that operates at a coarser granularity than per-symbol dynamic triggering, reducing network congestion while maintaining flexibility through the ability to adjust the permission state based on network conditions.
Solution Approach 2:
The patent uses semi-static TDD configurations that periodically define flexible symbols and transmission permissions. This periodic structure provides a middle ground between fully dynamic control and completely static configuration, reducing the frequency of control signaling compared to dynamic triggers while maintaining adaptability through periodic reconfiguration opportunities via MAC CE or RRC signaling.
Data Source
AI summary
Systems and methods are disclosed for control of configured transmissions in a cellular communications system. A method performed by a wireless communication device includes receiving, from a base station, a configuration of a set of symbols for one or more configured transmissions and monitoring for a Downlink Control Information (DCI) that uses a particular DCI format. The method further includes, when the wireless communication device does not detect a DCI that uses the particular DCI format and either: (a) a semi-static Time Division Duplexing (TDD) configuration received by the wireless communication device indicates the set of symbols configured for the one or more configured transmissions as flexible or (b) the wireless communication device did not receive a semi-static TDD configuration, making a determination of whether the one or more configured transmissions are allowed to be transmitted or are received based on whether a parameter is configured.