Uplink Timing Group Reconfiguration in Wireless Systems

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Solution Overview

Problem

When a base station resets a transmission timing group for a mobile station, the absence of a timing reference cell can prevent the mobile station from performing uplink transmission due to the lack of reference timing.

Innovation Solution

A wireless communication system where cells with identical uplink transmission timings are grouped, with one cell serving as a timing reference cell, allowing the base station to transmit a message for changing the group configuration, including random access information, enabling the mobile station to initiate a random access procedure using a new timing reference cell.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the base station resets the transmission timing group configuration, then the adaptability of the communication system is improved, but the mobile station cannot perform uplink transmission due to loss of timing reference

Engineering Contradiction:

Improvetransmission timing group configuration adaptabilityVSAvoiduplink transmission reliability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The base station includes random access information in the transmission timing group reconfiguration message in advance, so that the mobile station can immediately perform random access procedure when timing reference is lost, without waiting for timing drift to occur. This preliminary provision of random access information ensures continuous uplink transmission capability.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The random access procedure serves as an intermediary mechanism between the timing group reconfiguration and normal uplink transmission. When the timing reference cell changes or is deleted, the mobile station uses the random access procedure to re-establish timing synchronization before resuming normal uplink data transmission.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If the timing reference cell is deleted or moved to another group, then the transmission timing group configuration is optimized, but the mobile station loses reference timing and cannot adjust uplink transmission timing

Engineering Contradiction:

Improvetransmission timing group configuration efficiencyVSAvoiduplink transmission timing adjustment capability

Core Design Contradiction:

ProductivityVSEase of operation

Solution Approach 1:

Random access information is provided in advance in the reconfiguration message, enabling the mobile station to immediately initiate a random access procedure when the timing reference cell changes. This ensures the mobile station can quickly re-acquire timing reference without interruption to uplink transmission capability.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system changes the operational state of the mobile station from normal uplink transmission to random access procedure when timing reference cell changes occur. This parameter change in operation mode allows the mobile station to re-establish timing synchronization through the random access procedure before returning to normal operation.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If the base station provides random access information in the reconfiguration message, then the mobile station can maintain continuous communication, but the communication protocol complexity increases

Engineering Contradiction:

Improvecommunication continuityVSAvoidcommunication protocol complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The transmission timing group reconfiguration message serves multiple functions: it reconfigures the timing group parameters and simultaneously provides random access information. This multi-functionality reduces the need for separate signaling messages and minimizes protocol complexity while ensuring communication continuity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The random access information is merged into the existing transmission timing group reconfiguration message rather than being transmitted as a separate message. This combination reduces signaling overhead and protocol complexity while maintaining the ability to provide timely random access information for communication continuity.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentEP2804432B1Wireless communication system, mobile station device, base station device, wireless communication method, and integrated circuit

Publication Date: 2020.12.16 SHARP KK

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AI summary

A base station apparatus assigns a plurality of cells to a mobile station apparatus, and the base station apparatus and the mobile station apparatus communicate with each other via the plurality of cells. The plurality of cells are grouped into a plurality of groups, each group being made up of at least one cell having an identical transmission timing in the mobile station apparatus. In a case where a cell that has been deleted from one of the plurality of groups is added to another one of the plurality of groups in accordance with an instruction from the base station apparatus, the mobile station apparatus sets the added cell to be in a deactivated state.