Inactive-State Uplink Access Using Pre-Configured Grants
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Solution Overview
Problem
Existing wireless communication systems in the RRC_INACTIVE state require state transitions to RRC_CONNECTED state for initial data transmission, leading to increased latency and signaling overhead, which is inefficient for small and infrequent data transmissions.
Innovation Solution
Implementing pre-configured grant (pre-CG) configurations at the base station to enable initial data transmission in the RRC_INACTIVE state without transitioning to RRC_CONNECTED state, using configurations that include access type, transmission priority, mapped Logical Channel, Quality of Service flow, and valid timing advance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If state transition from RRC_INACTIVE to RRC_CONNECTED is performed for initial data transmission, then reliable data transmission is ensured, but transmission latency increases and signaling overhead increases
Solution Approach 1:
The network pre-configures uplink grant resources and transmission parameters for the UE before the UE enters RRC_INACTIVE state. These pre-configured resources include physical uplink shared channel (PUSCH) resources, modulation and coding schemes, and other transmission parameters. When the UE has small data to transmit in INACTIVE state, it can directly use these pre-configured resources without transitioning to CONNECTED state, thereby reducing latency while maintaining reliable transmission through predefined parameters
2Productivity
If state transition from RRC_INACTIVE to RRC_CONNECTED is performed for initial data transmission, then data transmission capability is ensured, but signaling overhead increases
Solution Approach 1:
The network performs preliminary configuration of uplink grant resources, physical uplink shared channel resources, modulation and coding schemes, and other transmission parameters before the UE enters RRC_INACTIVE state. This pre-configuration eliminates the need for extensive signaling during state transition, as the UE can directly utilize these pre-configured resources for small data transmissions in INACTIVE state, thereby reducing signaling overhead while maintaining full data transmission capability
Solution Approach 2:
The patent extracts and separates the resource configuration function from the state transition process. By configuring uplink grant resources in advance (before INACTIVE state), the patent removes the need for resource allocation signaling that would normally occur during transition to CONNECTED state. This extraction of the configuration step from the transition process reduces signaling overhead while preserving data transmission capability
Data Source
AI summary
A base station (BS) comprising a processor configured to perform operations is described. In an exemplary embodiment, the operations include generating one or more pre-configured grant (pre-CG) configurations. The operations also include transmitting the one or more pre-CG configurations to a user equipment (UE) to enable the UE to perform an initial transmission while the UE is in an RRC_INACTIVE state using a pre-CG resource based on the transmitted one or more pre-CG configurations. Each of the one or more pre-CG configurations includes a configuration of the pre-CG resource and one or more conditions to use the pre-CG resource. The one or more conditions to use the pre-CG resource include one or more of an access type, a transmission priority, a mapped Logical Channel (LCH)/Dedicated Radio Bearer (DRB)/Quality of Service (QOS) flow, and a valid timing advance (TA).