Session Admission Control in Broadband Wireless Networks
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Solution Overview
Problem
Current call admission control techniques in LTE networks are inadequate for managing complex traffic session admission needs, leading to potential instability and overloading, especially with modern applications requiring high bandwidth.
Innovation Solution
A method and system for session admission control in broadband wireless networks that involves obtaining a guaranteed bit rate, priority level, and quality of service class indicator for new sessions, calculating available capacity, and preempting lower-priority sessions with the same quality of service class to admit new sessions when capacity is insufficient.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If simple policy based admission control is used for LTE network, then implementation is straightforward, but it cannot handle complex traffic session admission control needs and may lead to system instability or overloading
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting admission control decisions based on multiple parameters including available capacity calculations, QoS class indicators, priority levels, and guaranteed bit rates. The system changes the state of admission control from static policy-based to dynamic parameter-driven, resolving the contradiction between simplicity and reliability.
Solution Approach 2:
The patent implements dynamics by introducing real-time capacity assessment and dynamic session management. The admission control mechanism adapts to changing network conditions by calculating available capacity and making informed decisions about session admission, preemption, and rejection based on current system state, thereby ensuring system stability while handling complex traffic needs.
2Reliability
If more bandwidth is allocated to new sessions, then quality of service for new sessions improves, but network capacity may be exceeded leading to overloading
Solution Approach 1:
The patent applies feedback by implementing a closed-loop admission control system that calculates available capacity based on current network state and uses this information to make admission decisions. The system continuously monitors network conditions and adjusts admission control accordingly, ensuring QoS for new sessions while preventing network overloading through capacity-aware decision-making.
Solution Approach 2:
The patent implements preliminary action by performing capacity calculations and availability assessments before admitting new sessions. The system proactively evaluates whether network capacity can accommodate new sessions and takes preventive actions such as rejecting sessions or preempting lower-priority sessions before capacity is exceeded, thereby maintaining both QoS and network stability.
3Productivity
If existing sessions are preempted to admit new sessions, then new session admission is enabled, but existing session continuity is disrupted
Solution Approach 1:
The patent applies local quality by implementing selective preemption based on session characteristics. The system identifies and preempts only specific sessions that match certain criteria (same QoS class indicator, lower priority level) rather than arbitrarily disrupting any session. This targeted approach enables new session admission while minimizing disruption to critical existing sessions, balancing productivity and reliability.
Data Source
AI summary
A method and system for providing session admission control for a new session in a broadband wireless network is provided. The method may include obtaining a guaranteed bit rate, a priority level, and a quality of service class indicator for the new session. The method may further include calculating an available capacity by utilizing the guaranteed bit rate. The method may further include searching through existing sessions for a first plurality of existing sessions having same quality of service class indicator as the new session and priority level lower than the priority level for the new session, if the available capacity is found to be a negative value. The method may further include filtering the first plurality of existing sessions to obtain a second existing session, preempting the second existing session, and admitting the new session in response to the preempting.