HSDPA Data Transmission Control for Cell Edge Reliability

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Solution Overview

Problem

The 3GPP protocol's reliance on hard handover in HSDPA leads to high call drop rates and limited capacity at cell edges, compromising network coverage and user equipment connectivity.

Innovation Solution

A data transmission control method that acquires a retransmission identification parameter for user equipment, determining if it can identify retransmitted data within a specific HARQ process, and accordingly sends retransmitted data using the same or a different HARQ process to improve data reception accuracy and prevent call drops.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If hard handover is used for session handover in HSDPA, then the protocol implementation is simple, but the call drop rate increases and cell edge capacity decreases

Engineering Contradiction:

Improveprotocol implementation simplicityVSAvoidcall drop rate

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent applies preliminary action by performing data retransmission within the same HARQ process before handover occurs. The base station retransmits data to the source cell's user equipment within the rated transmission interval, ensuring data is successfully received before the handover takes place, thereby preventing call drops at cell edges while maintaining protocol simplicity

Inventive Principle:

Principle #10Preliminary action

2Device complexity

If hard handover is used for session handover in HSDPA, then the handover mechanism is straightforward, but the cell coverage edge capacity becomes extremely small

Engineering Contradiction:

Improvehandover mechanism complexityVSAvoidcell coverage edge capacity

Core Design Contradiction:

Device complexityVSQuantity of substance

Solution Approach 1:

The patent performs data retransmission in advance within the same HARQ process before handover occurs. By ensuring data is successfully transmitted and acknowledged within the rated transmission interval at the source cell, the system prepares the user equipment for handover without data loss, thereby increasing cell edge capacity while keeping the handover mechanism straightforward

Inventive Principle:

Principle #10Preliminary action

3Reliability

If retransmitted data is sent using the same HARQ process within the rated transmission interval, then data receiving success rate improves, but transmission resource utilization increases

Engineering Contradiction:

Improvedata receiving success rateVSAvoidtransmission resource utilization

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent applies local quality by implementing retransmission only within the specific rated transmission interval within the same HARQ process, rather than using alternative HARQ processes or extended time intervals. This localized approach ensures data receiving success rate improvement while minimizing unnecessary transmission resource utilization, as retransmission is confined to the optimal time window before handover

Inventive Principle:

Principle #3Local quality

Data Source

PatentEP3166274B1Method and device for controlling data transmission

Publication Date: 2019.09.04 HUAWEI TECH CO LTD

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AI summary

The present invention discloses a data transmission control method and relates to the field of communications technologies. According to the method, HSDPA data is actively retransmitted on a network side, and an HARQ combination gain is used to improve a data receiving success rate of a cell edge, thereby improving a network coverage effect and resolving a problem of call drop of user equipment. This solution is mainly applied to an HSDPA network scenario, and may also be applied to another 3G or 4G mobile network.