Mobile Device Mobility Measurement Optimization

Solution Overview

Problem

In wireless communication networks, mobile devices face challenges in performing accurate mobility measurements when neighboring cells support both unicast and multicast subframe transmissions, leading to increased power consumption and measurement inaccuracies due to neglecting multicast transmissions during mobility measurements.

Innovation Solution

The mobile device receives a subframe sequence pattern from neighboring cells to determine the type of subframes being transmitted, allowing it to perform specific reference symbol measurements for multicast subframes and adjust measurement strategies accordingly, such as measuring only one RS-bearing OFDM symbol for multicast subframes and up to four for unicast subframes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the mobile device neglects multicast transmissions during mobility measurement, then measurement accuracy is maintained, but power consumption increases and measurement activity increases

Engineering Contradiction:

Improvemobility measurement accuracyVSAvoidmobile device power consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The patent applies local quality by differentiating the measurement approach based on subframe type. For unicast subframes, the mobile device performs comprehensive mobility measurements using multiple reference symbols. For multicast subframes, the device performs simplified measurements using fewer reference symbols, thereby reducing power consumption while maintaining adequate measurement accuracy for handoff decisions.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent implements partial action by performing mobility measurements only on unicast subframes and selectively on multicast subframes. Instead of uniformly measuring all subframe types, the device measures only the necessary portions (unicast subframes fully, multicast subframes partially) to achieve adequate measurement accuracy while reducing overall measurement activity and power consumption.

Inventive Principle:

Principle #16Partial or excessive action

2Measurement precision

If the mobile device performs mobility measurements on all subframe types, then measurement accuracy improves, but power consumption increases

Engineering Contradiction:

Improvemobility measurement accuracyVSAvoidmobile device power consumption

Core Design Contradiction:

Measurement precisionVSUse of energy by moving object

Solution Approach 1:

The patent applies local quality by differentiating the measurement approach based on subframe type. For unicast subframes, the mobile device performs comprehensive mobility measurements using multiple reference symbols. For multicast subframes, the device performs simplified measurements using fewer reference symbols, thereby reducing power consumption while maintaining adequate measurement accuracy for handoff decisions.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent changes the measurement parameter (number of reference symbols measured) based on the subframe type. The device adjusts the measurement intensity dynamically - measuring all reference symbols in unicast subframes but only a subset in multicast subframes - to optimize the balance between measurement accuracy and power consumption.

Inventive Principle:

Principle #35Parameter changes

3Productivity

If the mobile device treats multicast transmissions as unicast observations, then measurement activity is reduced, but measurement accuracy deteriorates

Engineering Contradiction:

Improvemobility measurement efficiencyVSAvoidmobility measurement accuracy

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

The patent applies local quality by differentiating the measurement approach based on subframe type. For unicast subframes, the mobile device performs comprehensive mobility measurements using multiple reference symbols. For multicast subframes, the device performs simplified measurements using fewer reference symbols, thereby reducing power consumption while maintaining adequate measurement accuracy for handoff decisions.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

Instead of treating all subframes uniformly as unicast (which would reduce measurement activity but compromise accuracy), the patent inverts the approach by identifying subframe types and applying differentiated measurement strategies. This inversion allows the device to maintain accuracy where needed while reducing activity where sufficient.

Inventive Principle:

Principle #13The other way round (Inversion)

Data Source

PatentUS8542619B2Method and apparatus for performing mobility measurements in a communication network

Publication Date: 2013.09.24 GOOGLE TECHNOLOGY HOLDINGS LLC

AI summary

A method and apparatus for performing mobility measurement in a communication network (100) is described. The method comprises of receiving a subframe sequence pattern from a node in the communication network (100). The subframe sequence pattern indicates types of subframes being transmitted by a neighboring cell node (104) in a neighboring cell (112). The method includes receiving a subframe from a sequence of subframes transmitted by the neighboring cell node (104) in the neighboring cell (112), and determining that the received subframe is a multicast subframe based on the subframe sequence pattern. The method then includes performing a single cell-specific reference symbol measurement in response to determining that the received subframe is the multicast subframe.