UE State Transition Data Handling for Early Packet Delivery
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Solution Overview
Problem
Existing wireless communication systems face challenges in managing data communication effectively when a user equipment (UE) transitions from an inactive or idle state to a connected state, particularly in scenarios involving small data transmissions, as current protocols do not provide clear guidance on how to proceed after the transition.
Innovation Solution
The proposed solution involves various methods for managing communications during state transitions, including reestablishing or resetting protocol entities like PDCP, RLC, and MAC entities, using HARQ processes, and assigning sequence numbers to packets, all aimed at optimizing data transmission without requiring the UE to fully transition to the RRC_CONNECTED state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a wireless device transitions from a connected state to an unconnected state without managing ongoing data communication, then the device can quickly release resources and reduce complexity, but data integrity is compromised and communication reliability deteriorates
Solution Approach 1:
The system performs preliminary actions by establishing a data suspension indication mechanism before the state transition occurs. The network device sends a data suspension indication to the wireless device in advance, allowing the wireless device to suspend ongoing data transmissions before transitioning to the unconnected state, thereby ensuring data integrity while maintaining simple state management.
2Reliability
If a wireless device suspends data communication upon state transition, then data integrity is maintained, but communication delay increases and productivity decreases
Solution Approach 1:
The system implements dynamic data suspension management where the suspension status can be changed based on network conditions. The network device can send a data resumption indication to the wireless device when appropriate, allowing the wireless device to resume suspended data transmissions. This dynamic approach maintains data integrity during state transitions while minimizing communication delays by resuming data flow when conditions permit.
3Reliability
If a network device implements comprehensive data suspension and resumption management, then data communication reliability is improved, but device complexity and processing overhead increase
Solution Approach 1:
The system uses standardized signaling messages as intermediaries to manage data suspension and resumption. The network device sends data suspension indications and data resumption indications through established signaling protocols, avoiding the need for complex custom management mechanisms. This intermediary approach maintains high data communication reliability while keeping network device processing complexity manageable by leveraging existing protocol frameworks.
Data Source
Figure 1A
Figure 1B~2A
Figure 2B
AI summary
To manage communications from a UE during a state transition, a central unit (CU) of a base station performs, by processing hardware, an early data transmission procedure with the UE while the UE is in an inactive state, including transmitting at least one data packet of a sequence of data packets to the UE (802). The CU determines to transition the UE from the inactive state to a connected state (808). In response to transitioning the UE to the connected state, the CU transmits, by the processing hardware, a next data packet in the sequence of data packets to the UE, or retransmits, by the processing hardware, the at least one data packet to the UE in response to determining the at least one data packet has not been received (812).