Probe Uplink Resource Allocation for Wireless Queuing Delay
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Solution Overview
Problem
Wireless communication systems, such as WiMAX and 3GPP-LTE, face challenges in aligning application output and uplink resource allocation, leading to undesirable time delays for real-time applications like VoIP and gaming, as the serving base station lacks ideal information on application packet arrival at the MAC layer of subscriber stations.
Innovation Solution
Implementing probe uplink resource allocations between periodic allocations to gather information on queue sizes and optimal transmission times, allowing the base station to adjust subsequent periodic allocations and reduce queuing delays by synchronizing with the optimal probe allocation time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If periodic uplink resource allocations are used in shared UL channel, then resource allocation efficiency is improved, but time delay between packet entry and exit from MAC layer queue increases
Solution Approach 1:
The base station performs preliminary actions by scheduling probe uplink resource allocations between periodic allocations to gather information on queue sizes and optimal transmission times. This advance information gathering allows the base station to proactively adjust subsequent periodic allocations, performing the useful action of delay reduction before the actual data transmission occurs.
Solution Approach 2:
The system transitions from static periodic resource allocations to dynamic allocations by introducing probe allocations that gather real-time queue information. The base station dynamically adjusts the timing and size of subsequent periodic allocations based on observed queue characteristics, making the resource allocation adaptive rather than fixed.
2Measurement precision
If probe uplink resource allocations are scheduled between periodic allocations, then information on queue sizes is obtained, but device complexity increases
Solution Approach 1:
Instead of continuously monitoring all queue characteristics, the system uses partial action by scheduling limited probe allocations at specific intervals between periodic allocations. This provides sufficient information for effective scheduling decisions without the excessive complexity of continuous monitoring, achieving the right balance between measurement precision and system complexity.
3Ease of operation
If periodic uplink resource allocations are used, then resource allocation is simplified, but alignment with application output timing is poor
Solution Approach 1:
The system implements feedback by using probe uplink resource allocations to gather information on queue sizes and optimal transmission times. This feedback loop allows the base station to adjust subsequent periodic allocations based on actual observed conditions, improving timing alignment with application output while maintaining the overall simplicity of periodic allocation structure.
Data Source
AI summary
A technique for reducing a time delay between an application output at a subscriber station and uplink resource allocation for the subscriber station includes scheduling, between periodic uplink resource allocations, one or more probe uplink resource allocations for the subscriber station. Next, respective information in at least one of the one or more probe uplink resource allocations is received at an access point. Finally, subsequent periodic uplink resource allocations are scheduled based on at least one of the one or more probe uplink resource allocations.