Wireless Resource Allocation for VoIP QoS via Channel Quality Scheduling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Persistent scheduling in VoIP traffic leads to increased packet transmission delay and failure to meet Quality of Service (QoS) requirements due to degraded reception quality and increased retransmissions, especially for terminals near the cell edge.
Innovation Solution
A wireless resource allocation method that dynamically selects between reservation-type and non-reservation-type scheduling based on communication channel quality and the number of terminals, reserving resources when channel quality is high and switching to non-reservation-type scheduling when quality drops below a threshold to ensure QoS is maintained.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If persistent scheduling is applied to VoIP traffic, then the number of terminals that can perform transmission at the same transmission time is increased, but packet transmission delay is increased and QoS is not satisfied
Solution Approach 1:
The patent applies dynamics by making the scheduling method adjustable rather than fixed. The base station dynamically switches between persistent scheduling and dynamic scheduling based on channel quality conditions. When channel quality is good, persistent scheduling is used to increase terminal capacity; when channel quality deteriorates, the system switches to dynamic scheduling to reduce packet transmission delay and satisfy QoS requirements.
Solution Approach 2:
The patent changes the scheduling parameter based on channel quality threshold. The base station determines whether to apply persistent scheduling or dynamic scheduling by comparing channel quality against a threshold. This parameter change allows the system to optimize between terminal capacity and packet transmission delay depending on current channel conditions.
2Device complexity
If persistent scheduling is applied to terminals near cell edge, then resource allocation is simplified, but reception quality is significantly degraded and retransmission increases
Solution Approach 1:
The patent applies local quality by differentiating scheduling approaches based on terminal location and channel conditions. Terminals near the cell edge with poor channel quality are assigned dynamic scheduling to ensure reliable packet transmission, while terminals with good channel quality receive persistent scheduling for simplified resource allocation. This localized approach ensures each terminal receives the appropriate scheduling method for its specific conditions.
Solution Approach 2:
The patent uses feedback mechanisms where the base station continuously monitors channel quality for each terminal. Based on this feedback, the base station determines whether to apply persistent or dynamic scheduling. This feedback loop ensures that terminals experiencing poor reception quality are automatically switched to dynamic scheduling, maintaining transmission reliability while still allowing persistent scheduling to simplify operations for terminals with good channel conditions.
3Loss of time
If dynamic scheduling is applied, then packet transmission delay is reduced and QoS is satisfied, but the number of users that can perform transmission at the same transmission time is limited
Solution Approach 1:
The patent makes the scheduling system dynamic by allowing switching between dynamic and persistent scheduling based on channel quality. When channel quality is poor, dynamic scheduling is applied to reduce packet transmission delay and satisfy QoS. When channel quality is good, the system switches to persistent scheduling to increase the number of users that can transmit simultaneously, thus optimizing both parameters under different conditions.
4Loss of substance
If persistent scheduling is applied, then control channel resources are saved, but coverage area where QoS is satisfied is reduced
Solution Approach 1:
The patent applies local quality by assigning different scheduling methods to different geographic areas based on channel quality. Terminals in areas with good channel quality (typically closer to the base station) are assigned persistent scheduling to save control channel resources. Terminals in areas with poor channel quality (cell edge areas) are assigned dynamic scheduling to ensure QoS satisfaction, thus expanding the effective coverage area while still saving control channel resources where applicable.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The present invention is a wireless resource allocation method for a base station performing data communication with a wireless terminal with traffic having periodicity in intervals of occurrence, the method comprising: acquiring communication channel quality for the terminal; in case that the communication channel quality is greater than, or is equal to or greater than a threshold for quality decision, selecting a reservation-type scheduling method with which cyclically usable wireless resources are reserved; in case that the communication channel quality is equal to or smaller than, or is smaller than the threshold for quality decision, selecting a non-reservation-type scheduling method with which allocation information is notified to the terminal each time wireless resources are allocated; and performing data communication with the terminal using the selected scheduling method.