Conditional QoS Allocation in Wireless Access Networks
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional wireless communication systems face inefficiencies in Quality of Service (QoS) resource allocation, particularly in push-to-talk (PTT) systems, leading to increased overhead and delay, which degrades system performance and results in call failures when access terminals (ATs) hand off to new serving areas without proper Unicast Access Terminal Identifiers (UATIs).
Innovation Solution
The proposed solution involves bundling connection requests and QoS resource reservations into access messages sent to the access network, allowing for conditional allocation of QoS resources and enabling QoS resource requests before establishing traffic channels, thereby reducing call setup delays and failures. This includes using Diffserv Code Point (DSCP) flags to instruct the network to perform conditional QoS allocations, ensuring QoS resources are allocated even when initial requests are denied due to incorrect UATIs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If QoS resource requests are sent before traffic channel establishment, then call setup delay is reduced, but resource allocation reliability deteriorates due to potential denial from incorrect UATIs
Solution Approach 1:
The access terminal performs preliminary QoS resource requests before traffic channel establishment by including QoS parameters in the initial access message. This allows the network to allocate QoS resources in advance, reducing call setup delay while the conditional allocation mechanism ensures reliability by verifying UATI correctness before final allocation.
Solution Approach 2:
The system implements feedback mechanisms where the access network responds to QoS resource requests with allocation confirmations or denials based on UATI validation. This feedback loop ensures that only correct UATIs receive resources, maintaining reliability while still allowing early requests to be processed.
2Productivity
If conditional QoS allocation is implemented, then system performance is improved, but device complexity increases due to additional messaging and processing
Solution Approach 1:
The access terminal merges the QoS resource request with the initial access message that also contains connection requests and other signaling information. This consolidation reduces the number of separate messages exchanged, simplifying the overall messaging protocol while maintaining conditional allocation functionality for improved system performance.
3Speed
If QoS resources are allocated before traffic channel establishment, then call setup speed increases, but overhead increases due to additional signaling messages
Solution Approach 1:
QoS resource allocation is performed in advance during the access message processing phase before traffic channel establishment. This preliminary action accelerates subsequent call setup operations by having resources ready, while the efficient integration into existing signaling messages minimizes additional overhead.
Data Source
AI summary
In an embodiment, an access network (AN) receives a message configured to prompt a conditional allocation of Quality of Service (QoS) resources to an access terminal (AT). The message can be received from the AT or from an application server (AS) that arbitrates a communication session for the AT. In another embodiment, if the AT determines that a QoS resource request has not yet been granted, the AT waits until the traffic channel (TCH) has been obtained for a communication session before resending the QoS resource request. In another embodiment, if the AT determines to initiate or join a second communication session before a confirmation that QoS resources for a first communication session are relinquished, the AT waits until the confirmation is received before a request for QoS resources for the second communication session is sent.