MsgA PUSCH Configuration Across Active UL BWPs in 2-Step RACH

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Solution Overview

Problem

Existing methods for configuring MsgA PUSCH configuration in 2-step RACH procedures lack flexibility, leading to increased signaling overhead and insufficient configuration options, especially when transitioning between RRC states and UL BWPs.

Innovation Solution

A terminal selects a set of configuration information for MsgA PUSCH based on active uplink BWP information, allowing for flexible configuration and switching to predefined BWPs if necessary, to perform the 2-step RACH procedure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If MsgA PUSCH configuration is configured for each UL BWP, then configuration flexibility is improved, but signaling overhead increases

Engineering Contradiction:

Improveconfiguration flexibilityVSAvoidsignaling overhead

Core Design Contradiction:

Adaptability or versatilityVSLoss of information

Solution Approach 1:

The patent applies local quality by configuring MsgA PUSCH parameters specifically for each UL BWP type (initial, default, dedicated) rather than uniformly across all BWPs. Each BWP type receives tailored configuration parameters appropriate to its specific function and characteristics, optimizing performance for each local context while avoiding redundant signaling.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent segments the MsgA PUSCH configuration into multiple sets corresponding to different UL BWP types. Instead of providing a single comprehensive configuration, the system divides configurations into distinct sets for initial UL BWP, default UL BWP, and dedicated UL BWP, allowing selective application based on the active BWP type and reducing overall signaling overhead.

Inventive Principle:

Principle #1Segmentation

2Loss of information

If MsgA PUSCH configuration is not configured for current active UL BWP, then signaling overhead is reduced, but configuration adaptability deteriorates

Engineering Contradiction:

Improvesignaling overheadVSAvoidconfiguration adaptability

Core Design Contradiction:

Loss of informationVSAdaptability or versatility

Solution Approach 1:

The patent applies preliminary action by pre-configuring MsgA PUSCH parameters for multiple UL BWP types (initial, default, dedicated) in advance. When a terminal transitions to a new active UL BWP, it can immediately use the pre-configured parameters without requiring additional real-time signaling, thus reducing overhead while maintaining adaptability.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent creates universal configuration sets that can be applied across different UL BWP types. The same configuration set can serve multiple BWP scenarios, allowing the system to reduce the total number of configurations while maintaining adaptability through selective application of appropriate configuration sets based on the active BWP type.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentEP4057758B1Terminal and communication method

Publication Date: 2026.01.07 NTT DOCOMO INC

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AI summary

A terminal includes a control unit that selects a set of configuration information related to a physical uplink shared channel transmission for a MessageA (MsgA PUSCH) in a two step random access procedure based on configuration information of an active uplink Bandwidth Part (BWP); and a transmitting unit that performs the MsgA PUSCH transmission by using the set of the configuration information selected by the control unit.