Uplink Packet Transmission Collision Avoidance

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Solution Overview

Problem

In cellular radio packet transmitting systems, uplink packet transmissions using synchronous HARQ or persistent scheduling schemes often collide with resources reserved for special purposes, such as random access channels, leading to inefficiencies and increased downlink overhead.

Innovation Solution

A method is introduced to determine if resources reserved for special purposes overlap with those allocated for packet transmission, allowing for delayed or partial transmission to avoid collisions, using resource allocation information and potentially altering retransmission timing or using residual resources.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If synchronous HARQ or persistent scheduling is used for uplink packet transmission, then downlink overhead is reduced, but collision with special-purpose resources occurs

Engineering Contradiction:

Improvedownlink overheadVSAvoidcollision avoidance

Core Design Contradiction:

Loss of energyVSReliability

Solution Approach 1:

The mobile station determines in advance whether the allocated resource overlaps with special-purpose resources before transmission. This preliminary check allows the system to proactively avoid collisions by delaying retransmission when overlap is detected, rather than reacting after collision occurs.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system dynamically adjusts retransmission timing based on resource overlap conditions. When overlap with special-purpose resources is detected, the retransmission is delayed to a different timing; when no overlap exists, normal retransmission proceeds. This dynamic adaptation resolves the contradiction between maintaining efficient scheduling and avoiding collisions.

Inventive Principle:

Principle #15Dynamics

2Reliability

If packet transmission is delayed to avoid collision with reserved resources, then collision avoidance is improved, but transmission time increases

Engineering Contradiction:

Improvecollision avoidanceVSAvoidtransmission time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The system applies delay only when necessary - specifically when resource overlap with special-purpose resources is detected. In cases where no overlap exists, transmission proceeds without delay. This partial application of delay minimizes time loss while still achieving collision avoidance when needed.

Inventive Principle:

Principle #16Partial or excessive action

3Device complexity

If resource allocation is fixed for persistent scheduling, then scheduling complexity is reduced, but flexibility to avoid collision is decreased

Engineering Contradiction:

Improvescheduling complexityVSAvoidcollision avoidance flexibility

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The mobile station autonomously determines resource overlap and makes scheduling decisions without requiring complex base station coordination. The system uses pre-configured special-purpose resource information to self-assess collision risk and autonomously adjusts retransmission timing, maintaining simple scheduling while achieving adaptive collision avoidance.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS9723633B2Method for transmitting packets in a mobile station

Publication Date: 2017.08.01 LG ELECTRONICS INC

AI summary

A method of performing uplink transmission at a user equipment (UE) is provided. The UE determines whether a hybrid automatic repeat request (HARQ) retransmission collides with a transmission for a random access in a time interval, and performs the HARQ retransmission when the HARQ retransmission does not collide with the transmission for random access in the time interval. A current value of information indicating a redundancy version (RV) for the HARQ retransmission is incremented by 1 when the HARQ retransmission does not collide with the transmission for random access in the time interval.