EV-DO Session Reclamation via Latency-Sensitivity Prioritization
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Solution Overview
Problem
Wireless communication systems face resource constraints as the number of sessions maintained by a radio network controller (RNC) increases, leading to potential blocking of users due to limited data storage and processing capacity, with existing solutions like hardware upgrades or least-recently-used session reclamation being inefficient or costly.
Innovation Solution
Implement a mechanism where the RNC reclaims sessions that have gone unused for a specified period, prioritizing best-effort sessions first and highly latency-sensitive sessions last, based on their latency-sensitivity profile IDs, to free up resources without notifying access terminals, thereby maintaining efficient communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the RNC maintains a large number of sessions to support more users, then user coverage and service availability are improved, but data storage and processing capacity are consumed, leading to resource exhaustion and user blocking
Solution Approach 1:
The patent changes the parameter of session reclamation from static (LRU based solely on time) to dynamic (priority-based on latency-sensitivity profile IDs). Sessions are reclaimed in ascending order of latency-sensitivity, allowing the system to maintain more sessions by intelligently selecting which sessions to reclaim based on their priority level rather than simply their age
Solution Approach 2:
The patent implements selective discarding of sessions that are least critical (best-effort sessions with higher latency tolerance) while preserving sessions that are most critical (latency-sensitive sessions). This allows the RNC to recover data storage capacity by discarding low-priority sessions while maintaining service for high-priority users
2Adaptability or versatility
If hardware capacity is upgraded to maintain more sessions, then user coverage is improved, but system cost increases
Solution Approach 1:
Instead of upgrading hardware capacity, the patent changes the operational parameter of session management from static LRU to dynamic priority-based reclamation. This software-based optimization allows the existing hardware to support more users by efficiently managing session resources based on latency-sensitivity profiles
Solution Approach 2:
The patent creates a virtual expansion of capacity through intelligent session management. By implementing priority-based reclamation algorithms, the system achieves the effect of having more available session slots without physically adding more hardware resources
3Quantity of substance
If least-recently-used session reclamation is used to free up resources, then data storage capacity is recovered, but latency-sensitive communications are disrupted
Solution Approach 1:
The patent changes the reclamation criterion from time-based (LRU) to priority-based (latency-sensitivity profile ID). Sessions are reclaimed in ascending order of latency-sensitivity, meaning best-effort sessions are reclaimed first while latency-sensitive sessions are preserved. This ensures data storage capacity is recovered without disrupting critical communications
Solution Approach 2:
The patent applies different reclamation policies to different sessions based on their local characteristics (latency-sensitivity profile IDs). Latency-sensitive sessions receive preferential treatment and are reclaimed last, while best-effort sessions are reclaimed first. This localized quality differentiation protects critical communications while still freeing up resources
Data Source
AI summary
Methods and systems are provided for implementing reclamation of EV-DO sessions based on latency-sensitivity. In an embodiment, an EV-DO access node (e.g. an RNC) maintains a plurality of sessions respectively associated with a plurality of access terminals. The plurality of sessions consists of a first number of sessions, each having an associated degree of latency-sensitivity. The access node compares the first number with a session-reclamation threshold. If the access node determines that the first number exceeds the session-reclamation threshold, the access node responsively reclaims one or more of the sessions that have been inactive for at least a threshold amount of time in ascending order of latency-sensitivity, without notifying the one or more associated access terminals.