Base Station Timing Adjustment for Multi-Point Transmission Synchronization

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Solution Overview

Problem

The existing multi-point transmission technologies in mobile communication systems, such as Single Frequency Dual Cell (SF-DC), face challenges in synchronizing the transmission of High Speed Shared Control Channels (HS-SCCH) and High Speed Dedicated Physical Control Channels (HS-PDSCH) across primary and secondary serving cells due to frame offset differences, leading to increased complexity and implementation costs in network and terminal design.

Innovation Solution

A method is introduced where the base station adjusts the transmission timing of HS-SCCH and HS-PDSCH based on frame offset information to align subframe boundaries within a specified range, using calculated transmission delay values to ensure synchronized transmission across primary and secondary serving cells, thereby reducing the complexity and cost of network and terminal design.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the base station adjusts transmission timing based on frame offset information to synchronize HS-SCCH and HS-PDSCH across primary and secondary serving cells, then the synchronization between cells is improved, but the device complexity increases due to additional timing adjustment mechanisms

Engineering Contradiction:

Improvesynchronization between primary and secondary serving cellsVSAvoidcomplexity of network and terminal design

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The base station pre-calculates transmission delay values based on frame offset information before actual data transmission. This preliminary timing adjustment ensures that HS-SCCH and HS-PDSCH arrive synchronously at the terminal without requiring complex real-time synchronization mechanisms during operation.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

Frame offset information acts as an intermediary parameter that mediates the timing relationship between primary and secondary serving cells. By using this intermediate information to calculate transmission delays, the system achieves synchronization without direct complex interaction between cells.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If the transmission timing is adjusted to align subframe boundaries within a specified range, then the data transmission efficiency is improved, but the loss of time increases due to additional delay calculations and adjustments

Engineering Contradiction:

Improvedata transmission throughputVSAvoidtime for delay calculation and transmission adjustment

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

Transmission delay values are calculated in advance based on frame offset information before data transmission begins. This preliminary calculation eliminates the need for time-consuming delay adjustments during actual data transmission, thus maintaining high throughput while achieving synchronization.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system changes the transmission timing parameter based on calculated delay values to optimize data transmission. By adjusting the timing parameter in advance rather than during transmission, the system achieves better throughput without significant time loss.

Inventive Principle:

Principle #35Parameter changes

3Ease of manufacture

If existing protocol specifications are followed without modification, then the implementation cost is reduced, but the ability to transmit jointly encoded ACK/NACK and CQI indication simultaneously to both cells is lost

Engineering Contradiction:

Improveimplementation cost of terminal and base stationVSAvoidcapability to transmit control information to multiple cells

Core Design Contradiction:

Ease of manufactureVSAdaptability or versatility

Solution Approach 1:

The base station pre-calculates and applies transmission delay values based on frame offset information before data transmission. This preliminary timing alignment ensures that control information can be transmitted to both cells simultaneously using existing protocol specifications, avoiding the need for protocol modifications while maintaining multi-cell functionality.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS9344250B2Method, system, base station and terminal for sending multipoint transmission system data

Publication Date: 2016.05.17 ZTE CORP

AI summary

The present document provides a method, a multi-point transmission system, a base station and a terminal for transmitting data in a multi-point transmission system. The method includes: for a User Equipment (UE) enabling multi-point transmission, a base station to which a secondary serving cell of the UE belongs adjusting a time when a High Speed Shared Control Channel (HS-SCCH) and a High Speed Dedicated Physical Control Channel (HS-PDSCH) are transmitted to the UE according to frame offset information of the primary and secondary serving cells of the UE, so that a subframe boundary offset between the HS-PDSCHs of the primary and secondary serving cells received by the UE is within a specified range, and a subframe boundary offset between the HS-SCCHs of the primary and secondary serving cells received by the UE is within the same specified range.