SIP Client Terminal Refresh Request Synchronization

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Solution Overview

Problem

In SIP-based telecommunication networks, client terminals maintaining multiple simultaneous soft-state dialogues with different server terminals experience high energy consumption due to frequent refresh requests, leading to rapid battery drain, especially in power-saving modes.

Innovation Solution

A synchronizing device detects time offsets between refresh messages and adjusts the refresh intervals to synchronize them, reducing energy consumption by coalescing transmission times and correlating refresh messages with other traffic.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If refresh requests are transmitted periodically to maintain multiple SIP dialogues, then the session state is maintained reliably, but energy consumption increases due to frequent transitions from low-power mode

Engineering Contradiction:

Improvesession state maintenanceVSAvoidenergy consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent merges multiple refresh requests that were previously transmitted at different times into a single synchronized transmission event. By aligning the refresh intervals of multiple SIP dialogues to coincide, the terminal transitions to operational state only once instead of multiple times, thereby maintaining session reliability while reducing energy consumption from repeated mode transitions.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent modifies the periodic action of refresh requests by synchronizing their timing across multiple dialogues. Instead of independent periodic transmissions, the refresh requests are coordinated to occur simultaneously at synchronized time instances, reducing the frequency of power mode transitions while preserving the periodic session maintenance function.

Inventive Principle:

Principle #19Periodic action

2Speed

If the terminal stays in operational state to handle refresh requests quickly, then communication responsiveness is improved, but battery life decreases due to prolonged high-power usage

Engineering Contradiction:

Improvecommunication responsivenessVSAvoidbattery life

Core Design Contradiction:

SpeedVSDuration of action of moving object

Solution Approach 1:

The patent implements synchronized periodic refresh requests that allow the terminal to return to low-power mode more frequently. By coordinating refresh transmissions across multiple dialogues, the terminal can maintain operational state for shorter, synchronized intervals rather than extended unsynchronized periods, thereby improving battery life while preserving communication responsiveness through timely periodic updates.

Inventive Principle:

Principle #19Periodic action

Data Source

PatentUS8996703B2Refresh requests in soft-state signalling

Publication Date: 2015.03.31 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

A power-saving synchronization of refresh requesting messages transmitted from a client terminal (31) to different server terminals (33a, 33b) in multiple soft-state dialogues, e.g. in SIP. The synchronization involves a continuous detection of a large time offset (34) occurring between the refresh requesting messages in the different dialogues, and an adjustment of the negotiated length of the refresh interval indicated in the refresh requesting messages, such that the client terminal will transmit the refresh requesting messages approximately simultaneously to the different server terminals.