Critical Service Manager Priority Data Transmission
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Solution Overview
Problem
In multi-layered communication systems, time-critical IP Multimedia Subsystem (IMS) data experiences delays and call failures due to ineffective retransmission mechanisms, especially when Radio Access Technology (RAT) is unavailable, leading to unacceptable latency.
Innovation Solution
A Critical Service Manager (CSM) evaluates priority information from various layers and modules to identify time-critical data, implementing alternative transmission methods such as Circuit Switched Fall Back (CSFB) or Wi-Fi when RAT is unavailable, and adjusting retransmission counts to minimize latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If normal retransmission mechanisms are used for time critical data, then data link layers can maintain simple operation, but latency increases and call establishment fails
Solution Approach 1:
The patent introduces an intermediary mechanism that allows higher layers to inform the data link layer about RAT unavailability. This intermediary communication channel enables the data link layer to adjust its retransmission behavior based on network conditions, reducing futile retransmissions and latency without significantly increasing complexity at the data link layer itself.
Solution Approach 2:
The patent implements preliminary action by having higher layers proactively notify the data link layer about RAT unavailability before retransmissions occur. This advance warning allows the data link layer to prevent unnecessary retransmission attempts, thereby reducing latency for time-critical data without requiring complex real-time decision-making mechanisms.
2Ease of operation
If data link layers follow normal retransmission mechanisms, then operation remains simple, but time critical data experiences unacceptable latency
Solution Approach 1:
The patent applies segmentation by separating the retransmission control function into two parts: the data link layer maintains its simple operation for standard data, while a separate mechanism handles time-critical data by utilizing information from higher layers about RAT availability. This segmentation allows the data link layer to remain operationally simple while still achieving reduced latency for priority data through coordinated control.
3Reliability
If retransmission attempts continue when RAT is unavailable, then data plane bearers maintain persistent connection attempts, but latency becomes unacceptable for time critical data
Solution Approach 1:
The patent implements dynamics by making the retransmission behavior adaptive rather than static. The data link layer dynamically adjusts its retransmission attempts based on real-time information about RAT availability received from higher layers. When RAT is unavailable, retransmissions are suppressed; when available, normal retransmission behavior resumes. This dynamic adjustment maintains reliability when needed while eliminating wasteful latency during unavailability.
Data Source
AI summary
Delay in IMS call establishment and other time critical data transfers may be reduced by seeking alternative transmission methods for time critical data, when a transmission cannot be completed or the Radio Access Technology is otherwise unavailable. A Critical Service Manager (“CSM”) receives and evaluates priority information about a given data transfer. By evaluating this priority information, the CSM can identify priority data, or latency intolerant data, such as IMS calls or emergency calls. Where network rejects a connection request and issues a wait timer, the CSM may lower the retransmission count to hasten a permanent transmission failure. Upon a permanent transmission failure, the CSM can determine an alternative protocol for transmission of the priority data, such as transmitting data through circuit switch fallback, via Wi-Fi, or through another legacy RAT.