Adaptive HARQ Scheme Selection for Mobile Communication Systems

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Solution Overview

Problem

Current mobile communication systems using HARQ are inefficient in handling multiple types of services and users, as they typically rely on either Synchronous HARQ (SHARQ) or Asynchronous HARQ (AHARQ), which are not optimized for diverse service types and user requirements.

Innovation Solution

A method and apparatus that dynamically determine and adapt the HARQ scheme (SHARQ or AHARQ) based on service type, packet size, mobile station class, and network load, by including an ID for the HARQ scheme in control information to enable adaptive data transmission and reception.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a fixed HARQ scheme (SHARQ or AHARQ) is used for all services, then the system structure is simple, but the system cannot efficiently handle multiple types of services and users

Engineering Contradiction:

Improveability to handle multiple service typesVSAvoidsystem structure complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent applies dynamics by making the HARQ scheme selectable and configurable rather than fixed. The system can dynamically choose between SHARQ and AHARQ based on service type, packet size, mobile station class, and network load conditions, enabling adaptability to diverse service requirements while maintaining a manageable system structure through standardized selection criteria

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the parameter of HARQ scheme configuration based on multiple factors including service type, packet size, mobile station class, and network load. By varying this critical parameter adaptively, the system optimizes performance for different service scenarios without requiring fundamentally different system architectures for each service type

Inventive Principle:

Principle #35Parameter changes

2Loss of time

If SHARQ is used for real-time services, then retransmission timing is predictable and low latency is achieved, but scheduling flexibility is reduced

Engineering Contradiction:

Improveretransmission timing delayVSAvoidscheduling flexibility

Core Design Contradiction:

Loss of timeVSAdaptability or versatility

Solution Approach 1:

The system dynamically selects between SHARQ and AHARQ based on service requirements. For real-time services requiring low latency, SHARQ provides predictable retransmission timing. For services requiring scheduling flexibility, AHARQ allows adaptive timing decisions. This dynamic selection enables the system to optimize between timing predictability and scheduling flexibility based on actual service needs

Inventive Principle:

Principle #15Dynamics

3Adaptability or versatility

If AHARQ is used for flexible scheduling, then scheduling freedom is improved, but retransmission timing predictability decreases

Engineering Contradiction:

Improvescheduling freedomVSAvoidretransmission timing uncertainty

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The system dynamically adapts the HARQ scheme based on service type and network conditions. When scheduling freedom is prioritized, AHARQ enables flexible resource allocation. When timing predictability is critical, SHARQ provides deterministic retransmission scheduling. The dynamic selection mechanism allows the system to balance between these competing requirements based on actual operational needs

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS7810009B2Apparatus and method for transmitting and receiving packet data using HARQ in a mobile communication system

Publication Date: 2010.10.05 SAMSUNG ELECTRONICS CO LTD

AI summary

A system and method is provided for transmitting packet data in a base station of a wireless communication system using a Hybrid Automatic Repeat Request (HARQ) scheme. The method includes determining a HARQ scheme for use, from among a plurality of HARQ schemes including a Synchronous HARQ (SHARQ) scheme and an Asynchronous HARQ (AHARQ) scheme for transmission packet data, and transmitting the packet data along with control information including information indicating the determined HARQ scheme.