Beam Sweep Random Access Msg 1 and Msg 2 for Wireless Reliability

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Solution Overview

Problem

Current wireless communication systems, particularly in 5G NR, face challenges in improving random access reliability and latency, especially in unlicensed spectra, due to limitations in multiple transmission opportunities and beam alignment during random access procedures.

Innovation Solution

The implementation of a method where user equipment (UE) transmits and receives random access messages (Msg 1 and Msg 2) using different resources and beams to multiple transmission reception points (TRPs), enhancing reliability through beam sweeping and multiple transmission opportunities in the time, frequency, and spatial domains.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If beam sweeping is implemented for random access messages, then reliability is improved, but device complexity increases

Engineering Contradiction:

Improverandom access reliabilityVSAvoiddevice complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent divides the random access procedure into multiple independent transmission opportunities across different beams, time slots, and frequency resources. Each transmission opportunity is segmented and can be independently received and processed by the network, allowing the UE to transmit Msg1 and monitor Msg2 across multiple divided channels without requiring complex coordination

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The network pre-configures multiple downlink beams and uplink resources for random access before the actual access procedure begins. Beam sweep patterns and resource allocations are established in advance, allowing the UE to simply follow the predetermined pattern for transmitting Msg1 and monitoring Msg2 without performing complex real-time beam management

Inventive Principle:

Principle #10Preliminary action

2Reliability

If multiple transmission opportunities are provided, then reliability is improved, but loss of time increases

Engineering Contradiction:

Improverandom access reliabilityVSAvoidrandom access latency

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent implements periodic transmission opportunities for random access messages at predetermined intervals across multiple beams. The network periodically transmits downlink reference signals and the UE periodically monitors for Msg2 responses at configured time intervals, creating a rhythmic access pattern that ensures multiple chances for successful access without excessive waiting

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent distributes multiple transmission opportunities across different dimensions including spatial (multiple beams), temporal (different time slots), and spectral (different frequency resources). This multi-dimensional distribution allows the system to provide redundant access opportunities without simply extending the time duration, as failures in one dimension can be compensated by successes in other dimensions

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Reliability

If beam alignment is performed, then reliability is improved, but productivity decreases

Engineering Contradiction:

Improvebeam alignment accuracyVSAvoidaccess speed

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent enables the UE to autonomously perform beam selection and alignment by autonomously measuring downlink reference signals from multiple beams and selecting the best beam for Msg1 transmission without requiring explicit network coordination or feedback for each beam measurement. The network simply provides the reference signals and the UE self-performs the alignment process

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The network pre-configures multiple downlink beams with reference signals before the random access procedure. The UE uses these pre-configured beams for measurement and selection, eliminating the need for real-time beam training and alignment negotiations during the actual access attempt

Inventive Principle:

Principle #10Preliminary action

4Reliability

If multiple resources are used for multiple TRPs, then reliability is improved, but device complexity increases

Engineering Contradiction:

Improverobustness of random accessVSAvoidresource management complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent configures multiple transmission reception points (TRPs) with identical or similar random access resource configurations including preamble sequences, time slots, and frequency resources. Each TRP serves multiple functions by handling both downlink reference signal transmission and uplink Msg1 reception using the same resource pool, simplifying the UE's resource management as it can use the same resource configuration for accessing multiple TRPs

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS11696333B2Beam sweep based random access msg 1 and msg 2

Publication Date: 2023.07.04 QUALCOMM INC

AI summary

A method, a computer-readable medium, and an apparatus are provided for wireless communication including random access between a base station and a user equipment (UE). The UE transmits at least two first random access messages (Msg 1) to multiple transmission reception points (TRPs) of at least one cell using different resources for the multiple TRPs. The UE monitors for at least two second random access messages (Msg 2) from the multiple TRPs of the at least one cell using different resources for the multiple TRPs.