Small Data Transmission in RRC Inactive State
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Solution Overview
Problem
Existing wireless mobile communication systems face challenges in efficiently performing small data transmission, particularly in maintaining low latency and supporting higher data rates as required by 5G systems.
Innovation Solution
The method involves receiving a RRCRelease message containing information for small data transmission, performing cell selection, receiving SystemInformationBlock1, initiating small data transmission based on the provided information, and monitoring PDCCH for a downlink assignment to ensure efficient data transfer without transitioning to the RRC_CONNECTED state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal transitions to RRC_CONNECTED state for data transmission, then the data transmission reliability is improved, but the transmission latency increases and network efficiency deteriorates due to state transition overhead
Solution Approach 1:
The terminal performs data transmission in the RRC_INACTIVE state before transitioning to RRC_CONNECTED. By preparing and sending small data packets while in the inactive state, the system avoids the latency introduced by state transition overhead, thereby reducing transmission latency while maintaining acceptable reliability for small data transmissions
2Productivity
If the terminal remains in RRC_INACTIVE state for data transmission, then the transmission latency is reduced and network efficiency is improved, but the data transmission reliability deteriorates
Solution Approach 1:
The system changes the transmission parameters by enabling small data transmission capabilities in the RRC_INACTIVE state. By modifying the operational parameters to allow data transmission without transitioning to connected state, the system achieves improved network efficiency and reduced latency while managing reliability through appropriate parameter configuration
3Reliability
If the terminal frequently transitions between RRC states to ensure data transmission, then the transmission reliability is improved, but the energy consumption increases and system complexity increases
Solution Approach 1:
The terminal performs data transmission in the RRC_INACTIVE state before transitioning to RRC_CONNECTED. By preparing and sending small data packets while in the inactive state, the system avoids the latency introduced by state transition overhead, thereby reducing transmission latency while maintaining acceptable reliability for small data transmissions
Solution Approach 2:
The system changes the transmission parameters by enabling small data transmission capabilities in the RRC_INACTIVE state. By modifying the operational parameters to allow data transmission without transitioning to connected state, the system achieves improved network efficiency and reduced latency while managing reliability through appropriate parameter configuration
Data Source
AI summary
A Method and Apparatus for performing small data transmission is provided. The method includes receiving a RRCRelease, the RRCRelease includes a first information for SDT, the first information for SDT includes a SRB2 (Signaling Radio Bearer2) indicator and a DRB (Data Radio Bearer) list, performing cell selection, receiving a SystemInformationBlock1 in a selected cell, the SystemInformationBlock1 includes a second information for SDT (Small Data Transmission), initiating a SDT based on the first information and the second information, transmitting a Medium Access Control (MAC)) Protocol Data Unit (PDU) including Common Control Channel (CCCH) Service Data Unit (SDU) for initial Physical Uplink Shared Channel (PUSCH) transmission, starting a first timer, monitoring PDCCH for a first identifier based on a first search space or a second search space, and stopping the first timer when a downlink assignment for the first identifier is received via Physical Downlink Control Channel (PDCCH).