HARQ ACK/NACK Bitmap Mapping for Broadband Wireless Efficiency

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Solution Overview

Problem

Current broadband wireless access communication systems face inefficiencies in utilizing the Hybrid Automatic Repeat Request (HARQ) scheme due to challenges in identifying subscriber stations and inefficient control data transmission, leading to degraded transmission efficiency and reduced actual data traffic in high-speed data transmission.

Innovation Solution

A method is introduced to support HARQ by transmitting ACK/NACK information through a bitmap in the uplink/downlink MAP messages, allowing efficient utilization of the HARQ scheme, with a dedicated ACK channel and reduced control data size, enhancing transmission efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If traditional HARQ operation methods are used in broadband wireless access systems, then subscriber station identification and control data transmission can be performed, but transmission efficiency is degraded and actual data traffic proportion is reduced

Engineering Contradiction:
Improvetransmission efficiencyVSAvoidcontrol data size
Core Design Contradiction:
ProductivityVSQuantity of substance

Solution Approach 1:

The patent extracts the essential HARQ feedback information (ACK/NACK) from the traditional control data structure and represents it using a compact bitmap format. This extraction approach reduces the control data size while preserving the necessary HARQ functionality, thereby improving transmission efficiency and increasing the proportion of actual data traffic.

Inventive Principle:
Principle #2Taking out (Extraction)

2Quantity of substance

If control data is transmitted in traditional HARQ mode, then subscriber station identification is maintained, but the proportion of actual data traffic is reduced

Engineering Contradiction:
Improveactual data traffic proportionVSAvoidcontrol data structure
Core Design Contradiction:
Quantity of substanceVSDevice complexity

Solution Approach 1:

The patent changes the representation parameter of control data from traditional detailed formats to a compact bitmap structure. This parameter change reduces the control data size and increases the proportion of actual data traffic, while the bitmap structure maintains sufficient information for subscriber station identification and HARQ operation.

Inventive Principle:
Principle #35Parameter changes

Data Source

PatentUS7400898B2Method for operation of HARQ in a broadband wireless access communication system
Publication Date: 2008.07.15 SAMSUNG ELECTRONICS CO LTD
  • US7400898B2 patent drawing
  • US7400898B2 patent drawing
  • US7400898B2 patent drawing

AI summary

Provided is a method supporting a Hybrid Automatic Repeat Request (HARQ) between a subscriber station and a base station in a broadband wireless access communication system. The method includes transmitting at least one HARQ enabled uplink burst from the subscriber station to the base station; generating ACKnowledgment/Negative ACKnowledgment (ACK/NACK) information according to the received HARQ enabled uplink burst at the base station; mapping the generated ACK/NACK information to a bitmap at the base station; and transmitting the bitmap through a downlink information from the base station to the subscriber station.