Base Station Controlled Handover Signaling

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

In wireless networks, the 'ping-pong effect' occurs when base stations instruct mobile stations to handover to non-optimal base stations, leading to conflicts and inefficient resource allocation, as both mobile stations and base stations use different handover algorithms and criteria, resulting in suboptimal handover decisions.

Innovation Solution

Implementing base station-controlled handover (BS-controlled HO) where the base station initiates handover decisions based on configured trigger events, allowing mobile stations to handover only under specific conditions, and enabling communication of handover capability support between mobile stations and base stations to synchronize handover processes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If mobile station initiates handover based on received channel quality, then handover decision speed is improved, but handover optimality deteriorates due to limited scope of mobile station

Engineering Contradiction:

Improvehandover decision speedVSAvoidhandover optimality

Core Design Contradiction:

SpeedVSManufacturing precision

Solution Approach 1:

The handover control function is segmented between mobile station (fast detection of local channel quality) and base station (comprehensive evaluation and final decision), allowing each entity to perform its specialized function optimally

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The base station acts as an intermediary that receives handover recommendations from mobile stations, evaluates them against network conditions and load balancing requirements, and makes the final handover decision to ensure overall network optimality

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If base station instructs mobile station to handover for load balancing, then network resource allocation is improved, but handover stability deteriorates due to ping-pong effect

Engineering Contradiction:

Improvenetwork resource allocationVSAvoidhandover stability

Core Design Contradiction:

ProductivityVSStability of the object's composition

Solution Approach 1:

The base station configures handover trigger events and parameters in advance, establishing clear conditions under which handover should occur, which prevents arbitrary or premature handover decisions that could cause ping-pong effects

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system implements feedback mechanisms where mobile stations report channel quality and handover status to base stations, allowing base stations to monitor handover performance and adjust load balancing decisions to maintain stability

Inventive Principle:

Principle #23Feedback

3Adaptability or versatility

If different handover algorithms are used by mobile station and base station, then handover adaptability is improved, but handover coordination deteriorates leading to conflicts

Engineering Contradiction:

Improvehandover adaptabilityVSAvoidhandover coordination

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent merges the handover decision-making process by having the mobile station provide recommendations based on its algorithms while the base station makes the final decision, combining the adaptability of mobile station algorithms with the coordination capability of base station control

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS8630262B2Signaling exchange for handover control for wireless networks

Publication Date: 2014.01.14 NOKIA SOLUTIONS & NETWORKS OY

AI summary

Various example embodiments are disclosed herein. According to an example embodiment, a technique may include transmitting, from a mobile station to a base station in a wireless network, a message (e.g., a subscriber station basic capability (SBC) request message) indicating whether or not the mobile station supports base station-controlled handover for the mobile station. The technique may also include receiving, by the mobile station from the base station, a message (e.g., a subscriber station basic capability (SBC) response message) indicating whether or not the base station supports base-station controlled handover.