Wireless Device Common Waiting Time LAA
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Solution Overview
Problem
The Licensed-Assisted Access (LAA) technology faces challenges in determining an appropriate waiting time for transmission to multiple destinations due to the uncertainty of ACK and NACK signals from various terminals, which affects the determination of backoff values for Listen Before Talk (LBT) operations.
Innovation Solution
A wireless communication device and method that sets a common waiting time for multiple destinations, updates counter values based on acknowledgement information, and determines a settable range for the waiting time to ensure effective transmission, using a CW update determination unit to adjust the contention window based on reception failure flags and acknowledgement history.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a common waiting time is set for transmission to multiple destinations in LAA, then resource utilization efficiency is improved, but it becomes difficult to determine an appropriate waiting time due to uncertainty of ACK and NACK signals from various terminals
Solution Approach 1:
The base station updates the counter value automatically based on received acknowledgement information (ACK/NACK) from terminals, and the transmission control unit automatically determines the waiting time based on the counter value. This self-service mechanism eliminates manual configuration and adapts dynamically to communication conditions, resolving the difficulty of determining appropriate waiting times while maintaining high resource utilization.
Solution Approach 2:
The system uses feedback from acknowledgement information (ACK/NACK) received from terminals to update the counter value, which in turn adjusts the waiting time for future transmissions. This feedback loop enables the system to adapt to changing communication conditions and determine appropriate waiting times automatically, improving resource utilization without increasing operational complexity.
2Reliability
If the contention window is updated based on acknowledgement information from multiple destinations, then interference avoidance is enhanced, but the determination process becomes more complex due to multiple ACK and NACK signals
Solution Approach 1:
The counter value updates automatically based on the received acknowledgement information without requiring manual intervention or complex external control. The transmission control unit automatically adjusts the waiting time based on the counter value, simplifying the overall process while maintaining reliable interference avoidance through adaptive contention window updates.
Solution Approach 2:
The system changes the parameter (counter value) based on the ratio of ACK to NACK signals received from multiple destinations. By adjusting the counter value and consequently the waiting time parameter, the system achieves reliable interference avoidance while managing the complexity of processing multiple acknowledgement signals through systematic parameter adjustment.
3Reliability
If different waiting times are determined for different destinations, then transmission reliability is improved, but resource utilization efficiency decreases due to inability to perform transmission to multiple destinations simultaneously
Solution Approach 1:
The system merges the waiting time determination for multiple destinations into a single common waiting time based on the counter value. This allows the base station to perform transmission to multiple destinations simultaneously after the common waiting time, improving resource utilization efficiency while maintaining transmission reliability through adaptive waiting time adjustment based on acknowledgement information from all destinations.
Solution Approach 2:
The counter value serves as a universal parameter that determines the waiting time for transmissions to multiple destinations simultaneously. This multi-functional approach allows the system to handle multiple destinations with a single waiting time parameter, enabling simultaneous transmissions while maintaining reliability through the adaptive nature of the counter value update mechanism.
Data Source
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AI summary
A wireless communication device includes a transmission unit that transmits a signal to a plurality of destinations after waiting for a common waiting time set for transmission to the plurality of destinations, a counter that updates a counter value on the basis of acknowledgement information from each destination for the signal transmitted by the transmission unit, and an update determination unit that determines a settable range of the common waiting time which is to be set for transmission to a plurality of scheduled transmission destinations according to the counter value. The transmission unit determines the common waiting time for transmission to the plurality of scheduled transmission destinations on the basis of the settable range determined by the update determination unit.