Random Access Procedure CQI Transmission Wireless Systems

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Solution Overview

Problem

Current wireless communication systems face delays and failures in the random access procedure, which is crucial for uplink transmission and network access, necessitating a more rapid and reliable method.

Innovation Solution

A method involving the transmission of a random access preamble, reception of a random access response containing an uplink resource assignment and a request for Channel Quality Indicator (CQI) transmission, utilizing specific identifiers and channels like PDCCH and PUSCH, to facilitate efficient uplink synchronization and resource allocation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional random access procedure is used, then network access can be achieved, but service delay increases and reliability decreases

Engineering Contradiction:

Improverandom access reliabilityVSAvoidservice delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent applies preliminary action by requesting and transmitting CQI information during the random access procedure itself (in the MSG3 transmission), rather than waiting for separate channel establishment. This allows the base station to have channel quality information available earlier, enabling faster and more reliable scheduling decisions, thereby reducing service delay while improving access reliability.

Inventive Principle:

Principle #10Preliminary action

2Productivity

If random access procedure is performed rapidly, then service delay is reduced, but resource allocation accuracy may deteriorate

Engineering Contradiction:

Improverandom access speedVSAvoidchannel quality assessment accuracy

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

The patent implements feedback by having the user equipment transmit CQI information during the random access procedure (in MSG3). This provides the base station with real-time channel quality feedback, enabling accurate resource allocation and scheduling decisions even when the random access procedure is performed rapidly, thus maintaining measurement precision while improving productivity.

Inventive Principle:

Principle #23Feedback

3Loss of time

If uplink resources are allocated quickly, then random access speed improves, but resource allocation reliability may worsen

Engineering Contradiction:

Improveuplink resource allocation timeVSAvoidresource allocation reliability

Core Design Contradiction:

Loss of timeVSReliability

Solution Approach 1:

The patent applies preliminary action by obtaining CQI information during the random access procedure itself, allowing the base station to make informed resource allocation decisions earlier in the process. This enables quick uplink resource allocation while maintaining reliability, as the base station has accurate channel quality information available before making scheduling decisions.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS9807756B2Method of performing random access procedure in wireless communication system

Publication Date: 2017.10.31 LG ELECTRONICS INC

AI summary

A method includes transmitting a random access preamble, receiving a random access response as a response of the random access preamble, wherein the random access response comprises an uplink resource assignment and a request for transmission of a Channel Quality Indicator (CQI), and transmitting the CQI in the uplink resource assignment.