Configured Grant Small Data Transmission for RRC_INACTIVE UEs
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Solution Overview
Problem
Current wireless communication networks lack defined procedures for mobile-terminated small data transmission in the RRC_INACTIVE state, leading to unnecessary transitions to the RRC_CONNECTED state, which increases signaling overhead and latency.
Innovation Solution
User equipment (UE) determines the appropriate user equipment identification for small data transmission based on its movement history and uses cell-specific or non-cell-specific identifications, and communicates using Configured grant or Random Access based small data transmission resources to manage downlink and uplink data without transitioning to a fully connected state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE transitions to RRC_CONNECTED state to receive downlink data, then data transmission can be established, but signaling overhead and latency increase
Solution Approach 1:
The patent segments the data transmission process into two independent parts: control plane signaling (which can remain in INACTIVE state) and user plane data (which can be transmitted directly). This allows the UE to receive downlink data without transitioning to CONNECTED state, thus reducing transition latency while maintaining data transmission reliability through the configured grant mechanism.
Solution Approach 2:
The patent introduces a configured grant mechanism as an intermediary that bridges the INACTIVE and CONNECTED states. This intermediary allows the network to pre-allocate resources and the UE to transmit data directly without full state transition, effectively mediating between the need for data transmission and the desire to remain in low-power INACTIVE state.
2Productivity
If the UE transitions to RRC_CONNECTED state for small data transmission, then data can be sent, but signaling overhead increases
Solution Approach 1:
The patent extracts the essential data transmission function from the full RRC_CONNECTED state. By using configured grant mechanisms, the system separates and extracts only the necessary data transmission capability, allowing UEs to send small data packets while remaining in INACTIVE state, thus reducing signaling overhead while maintaining data transmission capability.
Solution Approach 2:
Instead of requiring full CONNECTED state activation (excessive action), the patent enables partial data transmission capability through configured grants. This partial action allows the UE to transmit only the necessary small data packets without the full overhead of state transition, achieving productivity improvement with reduced complexity.
3Device complexity
If the network uses cell-specific identification, then identification is simplified, but mobility support is reduced
Solution Approach 1:
The patent makes the identification mechanism dynamic by allowing the UE to select between cell-specific and non-cell-specific identifications based on its movement history and current location. This dynamic adaptation enables the system to simplify identification when possible while maintaining mobility support when needed, resolving the contradiction between complexity and adaptability.
Data Source
AI summary
A method of wireless communication comprising receiving downlink control information comprising by a user equipment in an inactive state, 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.