RRC Inactive Small Data Transfer via MAC PDU Resume Signaling
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Solution Overview
Problem
Existing wireless communication systems are inefficient for UEs operating in RRC inactive or idle states, particularly when small amounts of data need to be transmitted, as they do not provide the flexibility required by certain types of UEs and communication needs.
Innovation Solution
The described techniques enable UEs to transmit a MAC PDU in an RRC resume request message while in an inactive state, which includes both data packets and a request to resume an active state, allowing small data transfer through a disaggregated base station with a CU/DU split architecture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If UEs transmit small data while in RRC inactive state using existing methods, then resource consumption is reduced, but data transmission efficiency deteriorates due to lack of flexibility
Solution Approach 1:
The patent combines small data transmission with RRC resume request messaging by allowing UEs to include small data packets within the RRC resume request message or MAC PDU. This merging enables simultaneous achievement of resource efficiency (by staying in inactive state) and transmission efficiency (by enabling direct data transfer without full connection establishment).
Solution Approach 2:
The RRC resume request message is enhanced to serve multiple functions: it既可以 resume the RRC connection for control plane signaling,又可以 carry small data transmissions. This multi-functionality allows the same message structure to handle both connection management and data transfer, improving overall system efficiency.
2Adaptability or versatility
If UEs maintain full active connection for small data transmission, then data transmission flexibility is improved, but device complexity and resource consumption increase
Solution Approach 1:
The patent segments the data transmission process by allowing small data to be handled separately from full connection establishment. UEs can transmit small data packets using simplified procedures (within inactive state messages) rather than requiring complete active connection setup, thereby reducing complexity while maintaining necessary flexibility.
Solution Approach 2:
The system dynamically adapts the connection state based on data transmission needs. For small data, the system remains in inactive state with simplified procedures; for larger or more complex data, full active connection is established. This dynamic approach optimizes the balance between flexibility and complexity.
3Reliability
If UEs transition to active state for every small data transmission, then data transmission reliability is improved, but transmission time increases due to state transition overhead
Solution Approach 1:
The patent implements preliminary action by pre-configuring uplink resources and data buffers while UEs are in inactive state. This allows small data to be transmitted immediately using pre-allocated resources without waiting for full connection setup, thereby reducing latency while maintaining transmission reliability through pre-established configurations.
Solution Approach 2:
The system changes operational parameters based on data size and transmission requirements. For small data, parameters are adjusted to allow transmission in inactive state with simplified procedures; for larger data, parameters trigger full active connection establishment. This parameter-based adaptation optimizes the balance between reliability and time efficiency.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may establish a wireless connection between the UE and a base station. The UE may identify, in an inactive state for the UE for the wireless connection, data to transmit to the base station. The UE may transmit, in the inactive state, a medium access control protocol data unit, the medium access control protocol data unit comprising both a data packet for the identified data and a request to resume an active state for the wireless connection.