Packet Duplication Status Handover in 5G NR
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Solution Overview
Problem
Current 5G NR systems face challenges in efficiently implementing packet duplication during handovers, particularly in ensuring seamless packet duplication across different base stations, which is crucial for maintaining reliability and reducing latency in ultra-reliable low-latency communications (URLLC) scenarios.
Innovation Solution
The proposed solution involves a procedure where a source base station generates and transmits a user equipment packet duplication status to a target base station during a handover. This status includes information on the uplink packet duplication performed by the user equipment with the source and other base stations, allowing the target base station to configure packet duplication for the user equipment's uplink radio bearers after the handover.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If packet duplication is implemented during handover in 5G NR systems, then reliability of uplink transmissions is improved, but device complexity and procedure complexity increase due to coordination between multiple base stations
Solution Approach 1:
The source base station performs preliminary actions by generating and transmitting the UE packet duplication status to the target base station before the handover is completed. This includes identifying which uplink radio bearers have packet duplication activated and forwarding this information in advance, allowing the target base station to be prepared for seamless continuation of packet duplication without complex real-time coordination
Solution Approach 2:
The source base station acts as an intermediary by collecting packet duplication status information from multiple base stations (including further base stations in dual-connectivity scenarios) and consolidating this information into a unified status report that is transmitted to the target base station. This intermediary role simplifies the overall system complexity by centralizing the information gathering and coordination function
2Stability of the object's composition
If packet duplication status information is transmitted during handover, then seamless packet duplication is achieved, but loss of time occurs due to additional signaling and processing steps
Solution Approach 1:
The packet duplication status information is merged with existing handover signaling messages and transmitted during the handover procedure rather than as a separate communication exchange. This combining approach ensures that packet duplication continuity is maintained while avoiding additional time-consuming signaling steps, as the information is conveyed through channels already established for handover coordination
Solution Approach 2:
The source base station prepares and transmits the packet duplication status information in advance during the handover preparation phase, before the actual handover execution. This preliminary transmission allows the target base station to have the necessary information ready, eliminating delays that would occur if the information needed to be requested and transmitted after handover initiation
Data Source
AI summary
The present disclosure relates to a source base station. The source base station comprises a processing circuitry that generates a user equipment packet duplication status. The user equipment packet duplication status includes information on the status of uplink packet duplication performed by a user equipment with the source base station and at least one further base station. The information on the status of uplink packet duplication is per uplink radio bearer, one or more uplink radio bearers being established between the user equipment and the source base station. The source base station further comprises a transmitter that transmits the user equipment packet duplication status to a target base station which is the target of a handover from the source base station performed for the user equipment.