QoS-Aware Session Establishment Across Access Networks
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing communication technologies face challenges in establishing communication sessions with quality of service (QoS) guarantees across different access technologies, leading to inconsistent performance and session establishment failures.
Innovation Solution
The implementation of QoS-aware communication session establishment techniques, where communication devices select suitable codecs based on reserved QoS and mode, ensuring sufficient QoS is reserved before session establishment, or operating with best-effort QoS when insufficient, allowing for seamless session setup across various access technologies like WLAN and 1xEV-DO networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If QoS reservation procedures are implemented for communication session establishment, then QoS reliability is improved, but device complexity and session establishment time increase
Solution Approach 1:
The patent performs QoS reservation procedures before finalizing the communication session establishment. The device attempts to reserve required QoS resources in advance, and only proceeds with session establishment if the reservation succeeds, thereby ensuring QoS reliability without compromising overall system simplicity
Solution Approach 2:
The patent implements a dynamic QoS mode selection mechanism that can switch between 'required' mode (where QoS reservation is mandatory) and 'preferred' mode (where QoS reservation is attempted but not mandatory). This dynamic approach allows the system to adapt to different network conditions and service requirements, balancing reliability needs against complexity constraints
2Reliability
If QoS reservation is required before session establishment, then QoS reliability is improved, but session establishment success rate deteriorates when QoS cannot be reserved
Solution Approach 1:
The patent introduces a dynamic QoS mode selection mechanism that switches between 'required' mode (mandatory QoS reservation) and 'preferred' mode (optional QoS reservation with best-effort fallback). This allows the system to maintain high QoS reliability when possible while preserving session establishment success rate by falling back to best-effort service when QoS reservation fails
Solution Approach 2:
The patent changes the QoS reservation parameter from a fixed mandatory requirement to a flexible parameter that can be adjusted based on device capabilities, network conditions, and service requirements. This parameter change enables the system to optimize between reliability and success rate by selecting appropriate QoS modes for different scenarios
3Adaptability or versatility
If multiple codecs are supported with different QoS requirements, then adaptability is improved, but codec selection complexity increases
Solution Approach 1:
The patent applies local quality by associating specific QoS requirements with each supported codec. Instead of treating all codecs uniformly, the system evaluates each codec's individual QoS needs against the available network resources, selecting the most appropriate codec for the current network conditions while maintaining support for multiple codecs
Solution Approach 2:
The patent uses parameter changes by comparing the QoS requirements parameter of each codec against the reserved QoS parameter. The system dynamically selects codecs based on whether their QoS requirements can be met by the reserved resources, thereby managing codec selection complexity through parameter-based evaluation rather than complex decision logic
Data Source
AI summary
In general, this disclosure relates to the establishment of communication sessions between communication devices. In particular, this disclosure describes techniques that provide for quality of service (QoS) aware establishment of communication sessions. As an example, a communication device may attempt to reserve QoS for one or more codecs using a QoS reservation procedure corresponding to the access technology of an access network via which the communication device accesses a core network. The communication device selects one or more codecs to include in a call control message, such a Session Description Protocol (SDP) message, based on the QoS reservation and a QoS mode of the device.