Configured Grant Allocation Across Base Stations for RRC Inactive UE

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Solution Overview

Problem

Existing wireless communication systems face challenges in efficiently managing configuration grant (CG) resources across multiple base stations, particularly for user equipment (UE) in radio resource control (RRC) inactive state, leading to high signaling overhead and large data transmission delays due to the need for state transitions and random access processes.

Innovation Solution

The system allows for inter-gNB CG configuration through the Xn interface, enabling UE to receive dedicated or common CG configurations for multiple cells, facilitating efficient small data transmission in RRC inactive state by allocating CG resources across different gNBs, and using broadcasted common configurations for random selection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If UE transitions to RRC connected state for data transmission, then data transmission reliability is improved, but data transmission delay increases and power consumption increases

Engineering Contradiction:

Improvedata transmission reliabilityVSAvoiddata transmission delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The network pre-configures multiple CG resources across different cells before the UE needs to transmit data. When in RRC inactive state, the UE can directly use these pre-configured resources without transitioning to connected state, eliminating the state transition delay while maintaining reliable transmission through pre-established resources.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent extracts the data transmission capability from the RRC connected state and makes it available in the RRC inactive state through configured grant resources. This allows UE to transmit small data packets without needing to transition to connected state, reducing delay and power consumption while maintaining transmission reliability.

Inventive Principle:

Principle #2Taking out (Extraction)

2Reliability

If UE transitions to RRC connected state for data transmission, then data transmission reliability is improved, but power consumption increases

Engineering Contradiction:

Improvedata transmission reliabilityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

Multiple CG resources are pre-configured across different cells before the UE needs to transmit data. The UE can directly utilize these pre-configured resources while remaining in the low-power RRC inactive state, avoiding the high power consumption associated with transitioning to RRC connected state while maintaining transmission reliability.

Inventive Principle:

Principle #10Preliminary action

3Productivity

If multiple CG configurations are allocated across multiple base stations, then data transmission efficiency is improved, but signaling overhead increases

Engineering Contradiction:

Improvedata transmission efficiencyVSAvoidsignaling overhead

Core Design Contradiction:

ProductivityVSQuantity of substance

Solution Approach 1:

The first base station acts as a universal configuration point that collects CG configurations from multiple base stations and consolidates them into a single set of configurations provided to the UE. This multi-functional approach allows the UE to access resources across multiple cells through one interface, improving transmission efficiency while avoiding the signaling overhead of separate configurations from each base station.

Inventive Principle:

Principle #6Universality (Multi-functionality)

4Adaptability or versatility

If random access process is used for data transmission in RRC inactive state, then access flexibility is improved, but data transmission delay increases

Engineering Contradiction:

Improveaccess flexibilityVSAvoiddata transmission delay

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The network performs the random access-like resource allocation in advance by configuring multiple CG resources across different cells before the UE needs to transmit data. When data needs to be transmitted, the UE can directly use the pre-configured resources without performing the random access process, maintaining access flexibility while eliminating the associated delay.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12531687B2Allocating configuration grant resources across multiple base stations

Publication Date: 2026.01.20 ZTE CORP

AI summary

Presented are systems, methods, apparatuses, or computer-readable media for allocating configuration grant resources across multiple base stations. A wireless communication device may obtain, rom a first wireless communication node, a plurality of configured grant (CG) configurations. Each of the plurality of CG configurations may be for data transmission in radio resource control (RRC) inactive state in a respective cell. The wireless communication device in the RRC inactive stat may use a first CG configuration from the plurality of CG configurations, to transmit data according to an identifier of a cell in which the wireless communication device camps.