CS-RNTI Control for RRC-Inactive Small Data Delivery
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Solution Overview
Problem
Current wireless communication networks do not specify mobile-terminated small data transmission in the RRC_INACTIVE mode, requiring user equipment to transition to the fully connected state, which increases signaling overhead and latency.
Innovation Solution
User equipment determines the appropriate user equipment identification for small data transmission based on its movement history and receives indications for one-shot or multiple-shot downlink data transmissions, using cell-specific or non-cell-specific identifications, and employs configured grant or random access-based methods for uplink data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If user equipment transitions to the fully connected state for small data transmission, then data transmission capability is improved, but signaling overhead and latency increase
Solution Approach 1:
The patent segments the data transmission process into two distinct modes: control plane small data transmission (using DCI format with CRC scrambled by CS-RNTI) and user plane small data transmission (using configured grant or random access procedures). This segmentation allows small data to be transmitted without full connection establishment, reducing latency while maintaining reliability for appropriate data sizes and types.
Solution Approach 2:
The patent employs preliminary action by pre-configuring uplink resources (configured grant type 1) before data transmission is needed. When the UE is in inactive state and has small data to transmit, these pre-configured resources can be immediately used without going through the full random access and connection establishment process, thereby reducing latency while ensuring reliable transmission.
2Reliability
If user equipment transitions to the fully connected state for small data transmission, then data transmission capability is improved, but signaling overhead increases
Solution Approach 1:
The patent extracts the essential data transmission function from the full connection establishment process. By implementing small data transmission mechanisms that operate independently of complete RRC connection establishment (using DCI format with CS-RNTI or configured grant in inactive state), the solution removes unnecessary signaling overhead while preserving the core data transmission capability.
Solution Approach 2:
The patent uses preliminary configuration of uplink resources (configured grant type 1) during the connection setup phase. This allows the UE to transmit small data packets without repeatedly establishing full connections, significantly reducing signaling overhead for frequent small data transmissions while maintaining reliable communication.
3Loss of time
If user equipment uses configured grant for uplink transmission in inactive state, then latency is reduced, but resource allocation flexibility decreases
Solution Approach 1:
The patent implements a dynamic resource allocation system where the UE can switch between configured grant (pre-configured resources) and random access-based transmission depending on channel conditions, data characteristics, and network state. This dynamic approach allows low latency for configured grant transmissions while maintaining flexibility to adapt to varying traffic patterns and channel conditions.
Solution Approach 2:
The patent introduces the DCI format with CRC scrambled by CS-RNTI as an intermediary mechanism. This allows the network to dynamically control and adjust pre-configured resources without requiring full connection establishment, providing both low latency (through pre-configured resources) and flexibility (through network-controlled activation and modification via DCI).
Data Source
AI summary
A method of wireless communication comprises receiving downlink control information by a user equipment in an inactive state. The downlink control information comprises a cyclic redundancy check scrambled by a radio network with at least one base-station with paging-Radio Network Temporary Identifier. The user equipment monitors paging message in inactive state and uses paging-Radio Network Temporary Identifier to decode reception of paging message, wherein the user equipment receives indication of small data transmission and identifier from radio network with at least one base-station.