Mobile Relay Paging Group Management for Signaling Reduction

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Solution Overview

Problem

In wireless relay networks, especially those with mobile relay stations, the mobility of relay nodes leads to increased signaling congestion and bandwidth usage due to simultaneous location updates from idle mobile stations when the relay node moves between paging groups.

Innovation Solution

Implementing a method where the mobile relay node requests and adds its paging group identification to the network's list, modifying messages to attached user nodes, thereby reducing the need for simultaneous location updates from these nodes and minimizing congestion by only requiring the relay node to perform location updates.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the relay node moves between paging groups, then the relay node can provide mobile coverage, but all attached idle state mobile stations must simultaneously perform location update procedures causing signaling congestion

Engineering Contradiction:

Improvemobile coverageVSAvoidsignaling congestion

Core Design Contradiction:

Adaptability or versatilityVSObject-generated harmful factors

Solution Approach 1:

The patent extracts the location update signaling burden from the mobile relay node and transfers it to the network controller. The relay node no longer needs to initiate location updates when moving between paging groups, as the network controller autonomously tracks and manages the relay node's position, thereby eliminating the harmful signaling congestion while preserving mobile coverage capability

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The network controller serves as an intermediary between the mobile relay node and the core network. It receives and processes location information from the relay node, managing the paging group associations centrally. This intermediary approach allows the relay node to move freely while the controller handles the complexity of location management, preventing signaling storms at the relay node level

Inventive Principle:

Principle #24Intermediary (Mediator)

2Measurement precision

If all idle state mobile stations perform simultaneous location updates when relay node moves, then location accuracy is maintained, but bandwidth consumption and link contention increase

Engineering Contradiction:

Improvelocation accuracyVSAvoidbandwidth consumption

Core Design Contradiction:

Measurement precisionVSQuantity of substance

Solution Approach 1:

The network controller performs preliminary location tracking and paging group management before mobile stations need to update their locations. By maintaining centralized knowledge of the relay node's current paging group, the controller can directly update mobile station location information without requiring simultaneous update procedures, thus preserving location accuracy while minimizing bandwidth consumption

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

Instead of requiring each mobile station to independently perform location update procedures, the network controller creates and distributes updated location information copies to the relevant mobile stations. This copying approach maintains location accuracy for all stations while consuming significantly less bandwidth compared to simultaneous bidirectional signaling from each station

Inventive Principle:

Principle #26Copying

3Loss of information

If the relay node initiates location update for each paging group change, then network awareness of relay position is improved, but system complexity and signaling overhead increase

Engineering Contradiction:

Improverelay position awarenessVSAvoidsystem complexity

Core Design Contradiction:

Loss of informationVSDevice complexity

Solution Approach 1:

The patent merges the location update function with the existing paging group management infrastructure. The network controller integrates relay node position tracking into its existing paging group association management, eliminating the need for separate location update procedures. This consolidation maintains network awareness of relay position while reducing system complexity and signaling overhead

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS7640028B2Apparatus, method and computer program product providing enhanced location update scheme for mobile station in a relay-based network

Publication Date: 2009.12.29 NOKIA TECHNOLOGIES OY

AI summary

A method, a computer program product and a network access node that operate to receive a message from a mobile relay node, the message including a request to add a particular paging group (PG) identification to a list of paging group identifications transmitted by the network access node; to contact a network backbone node to request permission to add the particular paging group identification to the list of paging group identifications transmitted by the network access node; and upon being granted permission, to add the particular paging group identification to the list of paging group identifications transmitted by the network node. The exemplary embodiments of this invention pertain also to the relay node and to the network backbone node. Through the use of the exemplary embodiments idle state user nodes that are attached to the mobile relay node do not see a change in the PG, since the particular PG is maintained by the mobile relay node and, therefore, the user nodes do not initiate a Location Update (LU) procedure when the relay node enters a new PG. Instead, only the mobile relay node performs the LU procedure with the network access node.