Packet Start Indicator for HARQ Wireless Data Throughput

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Solution Overview

Problem

In wireless communication systems using Hybrid Automatic Repeat reQuest (HARQ), data transmission in persistent resources is complex due to the receiver's unawareness of the initial transmission time, leading to frequent retransmissions and decreased data throughput.

Innovation Solution

Incorporating a Packet Start Indicator (PSI) in the initial transmission subpacket, which is used by the receiver to identify the initial transmission packet, allowing for efficient data demodulation and reducing the number of retransmissions by distinguishing between initial and retransmission packets.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If persistent resources are allocated for data transmission in HARQ system, then resource allocation efficiency is improved, but receiver cannot identify initial transmission packets leading to frequent retransmissions

Engineering Contradiction:

Improvedata throughputVSAvoidpacket identification accuracy

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The transmitter preliminarily attaches a Packet Start Indicator (PSI) to the initial transmission packet before transmission. This preliminary marking enables the receiver to easily identify initial packets without complex processing, thereby preventing misidentification and unnecessary retransmissions while maintaining efficient persistent resource allocation.

Inventive Principle:

Principle #10Preliminary action

2Device complexity

If receiver attempts to identify initial packets without PSI, then device complexity is reduced, but number of retransmissions increases

Engineering Contradiction:

Improvereceiver processing complexityVSAvoiddata throughput

Core Design Contradiction:

Device complexityVSProductivity

Solution Approach 1:

The Packet Start Indicator (PSI) acts as an intermediary signal between the initial transmission packet and the receiver. This simple intermediary bit provides clear packet identification information without requiring complex processing algorithms, thereby maintaining low device complexity while significantly improving data throughput by reducing unnecessary retransmissions.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If frequent retransmissions occur due to packet misidentification, then reliability is improved through error correction, but data throughput decreases

Engineering Contradiction:

Improveerror correction capabilityVSAvoiddata throughput

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The PSI mechanism provides implicit feedback about packet type (initial vs. retransmission) to the receiver. This feedback enables the receiver to accurately identify initial packets and avoid unnecessary retransmissions, thereby maintaining high reliability through proper error correction while improving data throughput by eliminating redundant transmission cycles.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS9215042B2Apparatus and method for transmitting and receiving packet data in a wireless communication system using hybrid automatic repeat request

Publication Date: 2015.12.15 NOKIA TECHNOLOGIES OY

AI summary

An apparatus and method for transmitting and receiving packet data in persistent resources in a wireless communication system using Hybrid Automatic Repeat reQuest (HARQ) are provided, in which a user buffer stores user data to be transmitted to a receiver, a controller allocates persistent resources to the receiver according to the data type of the user data and controls a Packet Start Indicator (PSI) to be included in an initial transmission subpacket, when the initial transmission subpacket is transmitted, and a transmission and reception processor transmits the user data and the PSI to the receiver and receives a response signal from the receiver.