SSB-Linked PUSCH Uplink for Idle-Mode Small Data

Solution Overview

Problem

In 5G communication systems, terminal devices in RRC idle or inactive modes face unnecessary power consumption and signaling overheads when transmitting small data packets due to the need to transition to the RRC connected mode or perform random access procedures.

Innovation Solution

A method where terminal devices in idle or inactive modes utilize a synchronization signal block (SSB) to determine a corresponding physical uplink shared channel (PUSCH) occasion for uplink information transmission, reducing power consumption and signaling overheads by maintaining a beam connection with the network device.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If terminal devices in idle or inactive mode transition to connected mode for data transmission, then data transmission capability is improved, but power consumption and signaling overheads increase

Engineering Contradiction:

Improvedata transmission capabilityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent applies partial action by allowing terminal devices to perform only the necessary uplink transmission on PUSCH occasions without completing full RRC connection restoration. The device sends data in idle/inactive mode using pre-configured PUSCH resources associated with SSB, performing just enough action to transmit small data packets while avoiding the excessive power consumption of full connection establishment.

Inventive Principle:

Principle #16Partial or excessive action

2Reliability

If terminal devices perform random access procedure for uplink transmission, then data transmission capability is improved, but signaling overheads increase

Engineering Contradiction:

Improvedata transmission capabilityVSAvoidsignaling overheads

Core Design Contradiction:

ReliabilityVSLoss of information

Solution Approach 1:

The patent extracts the essential data transmission function from the complete random access procedure. By associating PUSCH occasions with SSB and allowing direct uplink transmission on these occasions, the system separates the data transmission capability from the full random access signaling sequence, enabling small data packets to be sent without the overhead of complete random access procedures.

Inventive Principle:

Principle #2Taking out (Extraction)

3Reliability

If terminal devices restore RRC connection for data transmission, then data transmission capability is improved, but power consumption and signaling overheads increase

Engineering Contradiction:

Improvedata transmission capabilityVSAvoidconnection restoration complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies partial action by allowing terminal devices to perform only the necessary uplink transmission on PUSCH occasions without completing full RRC connection restoration. The device sends data in idle/inactive mode using pre-configured PUSCH resources associated with SSB, performing just enough action to transmit small data packets while avoiding the excessive power consumption of full connection establishment.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS12457610B2Communication method including a physical uplink shared channel (PUSH) based on a synchronization signal broadcast block (SSB) and apparatus

Publication Date: 2025.10.28 HUAWEI TECH CO LTD

AI summary

A communication method and an apparatus includes a terminal device that receives a first SSB, determines a PUSCH occasion corresponding to the first SSB, and sends uplink information by using the PUSCH occasion corresponding to the first SSB; and further, the terminal device receives, based on a spatial reception parameter of the first SSB, downlink information sent by a network device.