Small Data Transmission in RRC Inactive State
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Solution Overview
Problem
Current 5G wireless communication systems face inefficiencies in data transmission due to the need for state transitions between RRC_INACTIVE and RRC_CONNECTED states, leading to excessive overhead when data is not sufficient for transmission, which affects network performance.
Innovation Solution
The implementation of a new resumption procedure allowing data transmission and reception without transitioning to RRC_CONNECTED state through Small Data Transmission (SDT) using either Random Access (RA-SDT) or Configured Grant (CG-SDT) procedures, enabling data transfer while remaining in the RRC_INACTIVE state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If state transition between RRC_INACTIVE and RRC_CONNECTED is performed for data transmission, then data transmission capability is improved, but network overhead increases and efficiency deteriorates
Solution Approach 1:
The patent segments data transmission into two distinct paths: small data transmission (SDT) for small packets and regular connected mode transmission for large packets. This segmentation allows the system to optimize for different data sizes, reducing unnecessary state transitions for small data while maintaining full capability for large data transmissions.
Solution Approach 2:
The patent implements partial action by allowing limited data transmission capabilities in RRC_INACTIVE state through SDT procedures. Instead of requiring full connected mode functionality, the system provides just enough transmission capability for small data packets, reducing overhead while maintaining essential functionality.
2Reliability
If state transition to RRC_CONNECTED is performed for data transmission, then data transmission reliability is improved, but transmission time increases due to state transition overhead
Solution Approach 1:
The patent performs preliminary action by pre-configuring SDT parameters and resources while in RRC_INACTIVE state. The terminal and network establish SDT configurations in advance, allowing immediate small data transmission without the time-consuming state transition process, thus reducing latency while maintaining transmission reliability.
Solution Approach 2:
The patent enables skipping the RRC state transition process entirely for small data transmissions. By implementing SDT procedures that allow data transmission directly in RRC_INACTIVE state, the system rushes through the transmission process without the overhead of transitioning to connected mode, significantly reducing transmission time.
3Reliability
If RRC state transition is performed for every data transmission, then data transmission completeness is improved, but energy consumption increases
Solution Approach 1:
The patent implements dynamics by making the transmission mode adaptive based on data size and characteristics. The system dynamically selects between SDT for small packets and connected mode for large packets, optimizing energy consumption based on actual transmission needs rather than always transitioning to connected mode.
Solution Approach 2:
The patent changes the operational parameters by allowing data transmission in RRC_INACTIVE state with modified transmission parameters for SDT. This parameter change enables complete data transmission for small packets without the energy-intensive state transition, while maintaining the ability to switch to connected mode parameters for larger transmissions.
Data Source
AI summary
A Method for data arrival reporting is provided. The method includes receiving a RRCRelease, the RRCRelease includes a first information for SDT, determining radio bearers configured for SDT based on the first information, receiving a SystemInformationBlock1, the SystemInformationBlock1 includes a second information for SDT, monitoring Physical Downlink Control Channel for the first type Common Search Space Set configured by the first search space for Downlink Control Information with Cyclic Redundancy Check scrambled by the first identifier, initiating a SDT based on the first information and the second information, monitoring PDCCH for a first type CSS configured by a second search space for DCI with CRC scrambled by a second identifier, transmitting a UEAssistanceInformation if data mapped to bearers not configured for SDT becomes available, monitoring PDCCH for a second type CSS configured by a third search space for DCI with CRC scrambled by a third identifier.