Dynamic Scheduling for VoIP Silence Periods in Cellular Networks
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Solution Overview
Problem
Persistent scheduling in cellular radio communication networks leads to a waste of radio resources during silence periods in services like VoIP, as reserved transmission time intervals remain unused, preventing reallocation to other user terminals due to ongoing demodulation and feedback attempts by the originally assigned terminal.
Innovation Solution
A method where a base station sends control messages to user terminals to manage when to receive downlink data and send HARQ feedback, allowing for dynamic reallocation of radio resources by instructing the terminal to suspend HARQ operations and not send negative acknowledgments during silence periods, enabling the reuse of unused resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If persistent scheduling is used with predefined transmission time intervals, then signaling effort is reduced, but radio resources are wasted during silence periods when the originally assigned user terminal cannot receive reallocated resources
Solution Approach 1:
The patent applies dynamics by transitioning from static persistent scheduling to dynamic scheduling during silence periods. The base station switches from predefined transmission time intervals to dynamic allocations, allowing reallocation of radio resources to other user terminals while maintaining low signaling effort through controlled changes in scheduling mode.
Solution Approach 2:
The patent changes the scheduling parameter from fixed transmission time intervals to dynamic time intervals during silence periods. This parameter change enables the system to adapt radio resource allocation to actual usage needs, preventing waste while maintaining simplicity in the scheduling mechanism.
2Reliability
If persistent scheduling reserves transmission time intervals for a user terminal, then the terminal has guaranteed resource allocation, but the resources cannot be reallocated to other terminals during silence periods
Solution Approach 1:
The system dynamically adjusts its scheduling behavior based on activity state. During active periods, persistent scheduling guarantees resource allocation to the user terminal. During silence periods, the system transitions to dynamic scheduling that enables resource reallocation to other terminals, thus adapting to changing conditions while maintaining reliability when needed.
Solution Approach 2:
The base station periodically monitors the activity state of user terminals and switches between persistent and dynamic scheduling modes accordingly. This periodic evaluation allows the system to maintain guaranteed allocation during active periods while enabling reallocation during silence periods, balancing reliability and adaptability.
3Reliability
If the user terminal continues to monitor for transmissions during silence periods, then feedback mechanisms remain active, but power consumption increases and battery life decreases
Solution Approach 1:
The user terminal employs periodic action by monitoring for transmissions only during active periods and suspending monitoring during silence periods. The base station signals the transition to silence period mode, allowing the terminal to power down its reception and feedback mechanisms, thereby reducing power consumption while maintaining reliability when activity resumes.
Solution Approach 2:
The system implements self-service by automatically detecting silence periods and activating power-saving modes without requiring continuous external control. The base station and terminal mutually recognize silence conditions and independently adjust their operational states, reducing power consumption while maintaining necessary feedback functionality during active periods.
Data Source
AI summary
The invention concerns a method for scheduling of service data intended to be sent from a base station (BS1) over radio interfaces to a user terminal (UE1) by means of at least one control message sent from the base station (BS1) to the user terminal (UE1), whereby said at least one control message comprises or allows for a determination of at least one of the orders when the user terminal (UE1) shall perform reception of downlink data and when and under which circumstances the user terminal (UE1) shall send HARQ feedback information in upcoming transmission time intervals (TTI), a base station (BS1), a user terminal (UE1) and a communication network therefor.