Radio Terminal Timer Management for Latency-Critical Data

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Solution Overview

Problem

Radio communication systems face network access congestion, delays, and missed messages due to wireless communication terminals entering power saving modes, which can be detrimental in high-frequency communication scenarios like tsunamis or stock trading, as they disconnect from active network states and switch to IDLE or URA-PCH modes upon timer expiry.

Innovation Solution

Implementing a method and device that allow for scheduled periodic data exchanges between communication terminals and network nodes to reset timers before expiry, preventing the terminals from entering power saving modes, thus maintaining active connections and reducing latency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If the communication terminal enters power saving mode (IDLE or URA-PCH) upon timer expiry, then power consumption is reduced and battery time is extended, but network access congestion, delays, and missed messages occur

Engineering Contradiction:
Improvepower consumptionVSAvoidnetwork communication reliability
Core Design Contradiction:
Use of energy by moving objectVSReliability

Solution Approach 1:

The terminal dynamically adjusts its power saving behavior based on the type of data traffic. For delay-tolerant data (DTT), the terminal enters power saving mode to reduce power consumption. For latency-critical data (LCD), the terminal maintains active connection states to ensure timely delivery. This dynamic adaptation resolves the contradiction by making power consumption and communication reliability context-dependent rather than fixed.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The system changes the operational parameters of the communication terminal based on traffic type. When LCD is detected, the timer is prevented from expiring, keeping the terminal in active state (CELL-FACH or CELL-DCH). When only DTT is present, the terminal transitions to power saving mode (IDLE or URA-PCH). This parameter change approach allows the system to optimize between power consumption and communication reliability based on real-time conditions.

Inventive Principle:
Principle #35Parameter changes

2Ease of operation

If the terminal switches to URA-PCH instead of IDLE state, then network signaling problems are avoided and connection establishment is faster, but network access congestion and Random Access Signature collisions occur

Engineering Contradiction:
Improveconnection establishment speedVSAvoidnetwork access congestion
Core Design Contradiction:
Ease of operationVSObject-generated harmful factors

Solution Approach 1:

The patent applies different connection state strategies to different types of data traffic locally. For LCD traffic, the terminal maintains active connection states (CELL-FACH or CELL-DCH) to enable immediate transmission. For DTT traffic, the terminal allows transition to URA-PCH or IDLE states. This local differentiation resolves the contradiction by ensuring that only traffic requiring fast establishment actually uses active states, while other traffic can tolerate power saving modes.

Inventive Principle:
Principle #3Local quality

Solution Approach 2:

The patent segments data traffic into two categories: latency-critical data (LCD) and delay-tolerant data (DTT). This segmentation allows the system to apply different power management and connection state strategies to each segment. LCD traffic gets priority treatment with active connection maintenance, while DTT traffic can utilize power saving modes, thereby resolving the contradiction between fast connection establishment and network congestion.

Inventive Principle:
Principle #1Segmentation

3Reliability

If the terminal maintains active connection states to prevent power saving mode entry, then network communication reliability is improved, but power consumption increases

Engineering Contradiction:
Improvenetwork communication reliabilityVSAvoidpower consumption
Core Design Contradiction:
ReliabilityVSUse of energy by moving object

Solution Approach 1:

The terminal periodically monitors incoming data traffic to determine whether to maintain active connection states or transition to power saving mode. When LCD is detected in the buffer, the terminal maintains active state. When only DTT or no data is present, the terminal enters power saving mode. This periodic assessment resolves the contradiction by making the connection state dynamic rather than static.

Inventive Principle:
Principle #19Periodic action

Solution Approach 2:

The system dynamically switches between active connection states and power saving modes based on real-time traffic conditions. The terminal does not permanently maintain active states but rather adapts its connection state according to the presence of LCD or DTT traffic. This dynamic behavior resolves the contradiction by ensuring active states are maintained only when necessary for reliability.

Inventive Principle:
Principle #15Dynamics

4Duration of action of stationary object

If the timer is allowed to expire to enable power saving mode, then battery life is extended, but latency-critical communications are delayed or lost

Engineering Contradiction:
Improvebattery lifeVSAvoidcommunication latency
Core Design Contradiction:
Duration of action of stationary objectVSLoss of time

Solution Approach 1:

The system changes the timer expiration behavior based on traffic type. For LCD traffic, the timer is prevented from expiring by continuous data presence, keeping the terminal in active state and avoiding latency. For DTT traffic, the timer is allowed to expire, enabling power saving mode and extending battery life. This conditional parameter change resolves the contradiction between battery life and communication latency.

Inventive Principle:
Principle #35Parameter changes

Solution Approach 2:

The patent applies different timer management strategies to different traffic types locally. LCD traffic receives special treatment with timer prevention mechanisms that maintain active connection states. DTT traffic follows normal timer expiration and power saving transitions. This local differentiation resolves the contradiction by ensuring latency-critical communications are not affected by power saving transitions.

Inventive Principle:
Principle #3Local quality

Data Source

PatentUS9456417B2Method and device for increasing performance in a radio communication system
Publication Date: 2016.09.27 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
  • US9456417B2 patent drawing
  • US9456417B2 patent drawing
  • US9456417B2 patent drawing

AI summary

The present invention relates to a method and a device for increasing performance in a radio communication system (12). The method comprises obtaining an indication that it is desirable to avoid that a communication terminal (5) of the system (12) enters a power saving mode, the power saving mode being entered upon expiry of a timer of the communication terminal (5). The method further comprises allowing a scheme of scheduled periodic exchange of data between the communication terminal (5) and a node (8) of a network (10) of the system (12), intended to periodically reset the timer before its expiry by means of said periodic exchange of data. The method also comprises exchanging data between the communication terminal (5) and the network node (8) over a radio interface (11) in accordance with the scheme, whereby entry of the communication terminal (5) into the power saving mode is prevented.