RAN Update Timing for Small Data Transmission in RRC_INACTIVE
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Solution Overview
Problem
In wireless communication systems, particularly in RRC_INACTIVE states, periodic or aperiodic small data transmissions require resuming the connection to RRC_CONNECTED state, leading to inefficiencies and increased complexity, especially during RNA updates.
Innovation Solution
Implementing a method that includes starting a first timer upon receiving an RRC signaling message, determining whether to transmit a second message based on data radio bearer usage, and managing timers to optimize small data transmission during RNA updates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a UE in RRC_INACTIVE state transmits small data packets by resuming connection to RRC_CONNECTED state, then data transmission can be performed, but connection complexity and state transition overhead increase
Solution Approach 1:
The network pre-configures uplink resources (PUSCH) and transmission parameters for the UE while it is in RRC_INACTIVE state. This preliminary configuration enables the UE to transmit small data packets directly without needing to resume the RRC connection, thereby eliminating state transition overhead and reducing connection management complexity while maintaining data transmission capability
2Reliability
If RNA Update is performed to maintain area information, then network mobility management is improved, but link configuration releases affect ongoing small data transmission
Solution Approach 1:
The network performs preliminary configuration of uplink transmission resources and parameters before the RNA Update procedure releases link configurations. This allows the UE to complete small data transmission using the pre-configured resources before the RNA Update takes effect, ensuring transmission continuity without compromising RNA update reliability
Solution Approach 2:
The system dynamically adjusts the timing and resource allocation for small data transmission based on the RNA Update schedule. By coordinating transmission opportunities with the RNA Update cycle, the system ensures that data transmission can proceed using valid link configurations while still performing necessary RNA updates for mobility management
3Productivity
If RRC connection is resumed for small data transmission, then data can be transmitted, but message transmission overhead and latency increase
Solution Approach 1:
The network configures uplink PUSCH resources, modulation and coding schemes, and other transmission parameters in advance while the UE is in RRC_INACTIVE state. When small data needs to be transmitted, the UE can immediately use these pre-configured resources without undergoing RRC connection resumption, thereby eliminating state transition time and latency while maintaining efficient data transmission
Solution Approach 2:
The invention allows the UE to skip the RRC connection resumption procedure entirely for small data transmission by using pre-configured uplink resources in RRC_INACTIVE state. This skipping of the intermediate connection state achieves rapid data transmission by rushing directly from inactive state to data transmission without the time-consuming state transition process
Data Source
AI summary
The present application discloses a method and a device in a communication node for wireless communications. A communication node receives a first message; and as a response to the action of receiving a first message, starts a first timer; and determines whether to transmit a second message at a first time according to whether a packet is to be transmitted via a first data radio bearer; the first message is an RRC signaling, where a name of the first message includes RRC and Release, the first message indicating a first expiration value of the first timer; a time interval from the first time to the starting action of the first timer is no smaller than the first expiration value of the first timer. The present application proposes a scheme of canceling the performance of RNA update in Small Data transmission for guaranteeing the transmission of small data packets.