Mobile Station Transmission Delay Estimation for QoS
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Solution Overview
Problem
Existing packet communication systems, such as UMTS, face challenges in effectively prioritizing the allocation of uplink transmission resources among User Equipments (UEs) to meet quality of service (QoS) targets, as current methods do not always ensure a good quality of service due to inadequate scheduling of data units.
Innovation Solution
A method where User Equipments estimate the transmission delay of data units and request permission to transmit if the delay exceeds a threshold, allowing the base station to prioritize resource allocation based on the likelihood of breaching QoS targets by signaling necessary resource requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the base station prioritizes UEs with the greatest amount of data in their buffers, then the allocation of uplink transmission resources is simplified, but the quality of service deteriorates because such methods do not necessarily achieve good QoS
Solution Approach 1:
The patent changes the parameter used for prioritization from 'amount of data in buffer' to 'estimated transmission delay'. Each UE estimates the transmission delay of its data units and signals this information to the base station, which then uses the delay estimates to make scheduling decisions. This parameter change enables the system to meet QoS targets by prioritizing UEs with longer estimated delays, thereby resolving the contradiction between simple prioritization and good QoS.
2Loss of information
If the UE transmits requests for permission and buffer indications continuously, then the base station receives sufficient information for scheduling, but the uplink overhead increases
Solution Approach 1:
The patent applies preliminary action by having the UE estimate and prepare the transmission delay information before the base station needs to make scheduling decisions. The UE continuously monitors its buffer status and pre-calculates delay estimates, then signals this information to the base station. This allows the base station to receive necessary scheduling information in advance without requiring continuous heavy signaling, thus reducing uplink overhead while maintaining information completeness.
3Device complexity
If the base station schedules transmission based on current buffer status only, then the scheduling decision is simple, but the QoS target may be breached due to insufficient consideration of transmission time
Solution Approach 1:
The patent applies preliminary action by having the UE estimate the transmission delay of its data units before scheduling decisions are made. The UE calculates how long it will take to transmit its buffered data at the intended rate and signals this estimate to the base station. The base station then uses this preliminary delay information to make informed scheduling decisions that account for future transmission time, ensuring QoS targets are met while maintaining relatively simple scheduling logic.
Data Source
AI summary
A method of operating a communication station including queuing data units, estimating the transmission delay of at least one of the data units in the queue, and if the estimated transmission delay exceeds a threshold, requesting permission to transmit at least one data unit.