Second Type CFRA PUSCH Latency Reduction

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Solution Overview

Problem

With the advancement of technologies, the number of random access types in communication standards is increasing, leading to a challenge in triggering random access with smaller transmission delay of a PUSCH.

Innovation Solution

A method and apparatus for a terminal equipment to receive configuration of second type contention-free random access (CFRA), allowing it to perform a second type CFRA with smaller transmission delay of a PUSCH, by receiving resource configuration including a second type CFRA preamble index, physical random access channel occasion (RO) configuration, and physical uplink shared channel (PUSCH) configuration.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If multiple types of random access exist in communication standards, then the adaptability and versatility of the system is improved, but the transmission delay of PUSCH increases

Engineering Contradiction:

Improverandom access typesVSAvoidtransmission delay of PUSCH

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The patent segments the random access procedure into two distinct types: first type CFRA (contention-free random access) and second type CFRA. The first type follows traditional 4-step procedure with separate preamble transmission and PUSCH scheduling, while the second type implements a streamlined 2-step procedure where preamble and PUSCH resources are allocated simultaneously, eliminating the need for separate Msg3 transmission and reducing overall transmission delay.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces dynamic resource configuration for the second type CFRA, where the network device dynamically allocates PUSCH resources and preamble indices based on real-time conditions. This dynamic allocation mechanism allows the system to adapt to varying transmission requirements and minimize delay while maintaining flexibility for different access scenarios.

Inventive Principle:

Principle #15Dynamics

2Reliability

If traditional 4-step contention-based random access is used, then the reliability of random access is improved, but the transmission delay of PUSCH increases

Engineering Contradiction:

Improverandom access reliabilityVSAvoidtransmission delay of PUSCH

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent applies preliminary action by pre-configuring PUSCH resources and preamble indices before the actual random access transmission. The network device prepares and allocates dedicated PUSCH resources in advance, allowing the terminal to transmit both preamble and data in a coordinated manner without waiting for separate resource allocation steps, thus reducing delay while maintaining reliability.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent merges the preamble transmission and PUSCH data transmission into a single integrated second type CFRA procedure. Instead of separating these operations as in the traditional 4-step process, the second type combines them into simultaneous transmission, reducing the number of steps and overall transmission time while maintaining access reliability through coordinated resource allocation.

Inventive Principle:

Principle #5Merging (Combining)

3Loss of time

If second type CFRA is implemented, then the transmission delay of PUSCH is reduced, but the device complexity increases

Engineering Contradiction:

Improvetransmission delay of PUSCHVSAvoidrandom access configuration

Core Design Contradiction:

Loss of timeVSDevice complexity

Solution Approach 1:

The patent applies local quality by providing different random access configurations for different scenarios. The network device configures first type CFRA parameters for certain conditions and second type CFRA parameters for other conditions, allowing each access type to be optimized for its specific use case. This selective configuration approach reduces overall system complexity by avoiding unnecessary configuration overhead for scenarios that don't require the enhanced second type procedure.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS12336020B2Random access method and apparatus and communication system

Publication Date: 2025.06.17 1FINITY INC

AI summary

A random access method and apparatus and a communication system. The apparatus includes a first processor circuit, the first processor circuit being configured to: receive resource configuration of contention-free random access, the resource configuration of contention-free random access comprising resource configuration of second type contention-free random access (CFRA); and perform a second type contention-free random access procedure according to the resource configuration of the second type CFRA, wherein the resource configuration of the second type CFRA comprises a second type CFRA preamble index associated with a synchronization signal block (SSB) or a channel state information reference signal (CSI-RS), configuration of a physical random access channel occasion (RO) of a second message (MsgA), and configuration of a physical uplink shared channel (PUSCH) of the MsgA.