Random Access Procedure for Early Data Transmission

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Solution Overview

Problem

Current wireless communication systems face inefficiencies in handling a wide range of devices with different traffic profiles and coverage requirements, particularly in supporting low-complexity devices with infrequent, low-bandwidth data transmissions in areas with poor coverage, such as IoT applications.

Innovation Solution

A method for a communications device to receive user plane data from a wireless network without an active radio resource connected mode, involving the reception of paging signaling or random access procedure messages to determine radio resources for data transmission and provide feedback on successful data receipt, enabling efficient communication during random access procedures.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If devices establish active radio resource connected mode for data transmission, then data transmission reliability is improved, but power consumption increases and latency increases

Engineering Contradiction:

Improvedata transmission reliabilityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The network performs downlink early data transmission during the random access procedure before the device completes full RRC connection setup. This preliminary action allows data to be transmitted while the device is still in the process of establishing connection, avoiding the need to wait for full connection establishment and thus reducing power consumption and latency while maintaining transmission reliability

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The random access procedure is extended to include data transmission capabilities throughout the procedure rather than just for initial connection setup. By making the random access procedure continuous and useful for both connection establishment and data transmission, the system eliminates the need to switch between disconnected and connected states, thereby reducing power consumption while maintaining reliable data delivery

Inventive Principle:

Principle #20Continuity of useful action

2Reliability

If frequent RRC connections are established for data transmission, then data transmission reliability is improved, but device complexity and operational overhead increase

Engineering Contradiction:

Improvedata transmission reliabilityVSAvoidRRC connection management complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The random access procedure is given multiple functions: it serves both for initial connection establishment and for downlink early data transmission. This multi-functionality reduces the need for separate RRC connection establishment procedures, thereby reducing device complexity and operational overhead while maintaining data transmission reliability through the unified random access procedure

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent merges the data transmission function with the random access procedure. Instead of having separate procedures for connection setup and data transmission, the system combines these functions into a single integrated random access procedure, reducing the number of state transitions and management operations required while ensuring reliable data delivery

Inventive Principle:

Principle #5Merging (Combining)

3Ease of operation

If devices use standard random access procedure for data transmission, then ease of operation is improved, but coverage enhancement is insufficient for low-complexity devices in poor coverage areas

Engineering Contradiction:

Improvedevice operation simplicityVSAvoidcoverage enhancement

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system incorporates feedback mechanisms during the random access procedure to confirm successful data reception. By using feedback from the device during the random access phase, the network can verify data delivery without requiring full RRC connection, thereby enhancing coverage for low-complexity devices in poor coverage areas while maintaining operational simplicity

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS11457471B2Methods, communications device and infrastructure equipment

Publication Date: 2022.09.27 SONY GROUP CORP

AI summary

A method of operating a communications device for receiving user plane data from a wireless communications network when the communications device is not in an active radio resource connected mode is provided. The method comprises receiving a message from the wireless communications network, the message including an indication that the wireless communications network has user plane data for transmission to the communications device while the communications device is not in an active mode, determining from the message a set of radio resources on which the user plane data is to be transmitted, wherein the user plane data is to be received by the communications device from the wireless communications network as part of a random access procedure, and transmitting to the wireless communications network an indication of whether or not the communications device successfully received the user plane data using the determined set of radio resources.