Token Bucket Based c-DRX Synchronization for Wireless Communication
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Solution Overview
Problem
Current wireless communication systems face challenges in coexistence between devices using different radio access technologies, particularly in aligning schedules for low-power states and token bucket management, which affects efficient communication and resource utilization in shared radio frequency bands.
Innovation Solution
The method involves determining the state of a token bucket at a wake-up time defined by a discontinuous reception schedule, exiting low-power states when tokens are available, and receiving control information over a radio frequency band, with mechanisms for reserving and using radio frequency bands based on token availability, including fractional tokens, to ensure efficient communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If devices operate in low-power states with discontinuous reception schedules, then energy consumption is reduced, but communication timing alignment and resource utilization efficiency deteriorate
Solution Approach 1:
The system performs preliminary actions by pre-scheduling wake-up times and control information transmissions to coincide with token bucket availability. The network side determines token bucket status in advance and schedules control information transmission accordingly, so that devices wake up exactly when resources are available, avoiding both premature wake-ups (wasting energy) and delayed receptions (reducing productivity).
Solution Approach 2:
The system implements feedback mechanisms where the network side monitors token bucket status and adjusts scheduling decisions based on this information. Control information about token bucket state is transmitted to devices, enabling them to synchronize their wake-up schedules with actual resource availability, thus resolving the contradiction between energy saving and communication efficiency.
2Reliability
If devices wake up at scheduled times to check for control information, then communication reliability is improved, but energy consumption increases due to frequent wake-ups
Solution Approach 1:
The system dynamically adjusts wake-up schedules based on token bucket status. Instead of fixed periodic wake-ups, devices adapt their wake-up timing to match when control information is actually scheduled for transmission. This dynamic synchronization ensures reliable communication reception while minimizing unnecessary wake-ups that would consume energy.
Solution Approach 2:
The system changes the timing parameter of wake-up events based on token bucket state. When tokens are available, wake-up times are scheduled to coincide with control information transmission. When tokens are unavailable, wake-up times are adjusted or delayed. This parameter adaptation allows the system to maintain communication reliability while optimizing energy consumption patterns.
3Productivity
If multiple devices share radio frequency bands with different radio access technologies, then spectrum utilization is improved, but schedule alignment and coexistence efficiency deteriorate
Solution Approach 1:
The network side acts as an intermediary that coordinates between devices using different radio access technologies. It manages token bucket resources centrally and schedules control information transmissions for multiple devices with different RATs, ensuring that wake-up schedules across different technologies are aligned with resource availability without requiring complex peer-to-peer synchronization between devices.
Solution Approach 2:
The token bucket mechanism serves as a universal resource management framework that works across multiple radio access technologies. By using a common token-based scheduling approach, the system provides a unified method for managing spectrum sharing between different RATs, simplifying the complexity of schedule alignment while maintaining high spectrum utilization.
Data Source
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AI summary
Methods and apparatuses for transmitting additional information over a radio access network are described. A method of wireless communication includes aligning a discontinuous reception (DRx) schedule for a user equipment (UE) with a plurality of token arrival times, determining, at a time based on a first token arrival time, whether a radio frequency (RF) band is available for communication, and transmitting control information on the RF band when the RF band is available for communication. The token arrival time may correspond to a waking time for the UE defined by the DRx schedule.