Seamless Handover via SN Status Transfer and Data Stopping Indication
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Solution Overview
Problem
Current handover processes in wireless communication systems experience delays, unnecessary data transmission, and issues with missing or duplicated data packets due to non-sequential data transmission, leading to resource wastage and power consumption.
Innovation Solution
A method and eNB equipment that continue transmitting downlink data and receiving uplink data during the handover process, with a Sequence Number (SN) status transfer to synchronize data transmission and reception, and a data transmission stopping indication to prevent duplicate data transmission, ensuring seamless handover by managing data packets through SN status transfer messages and PDCP status reports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the source eNB stops transmitting downlink data and receiving uplink data during handover (step 203), then data transmission interruption is avoided, but transmission delay is caused and resources are wasted
Solution Approach 1:
The source eNB performs preliminary data forwarding to the target eNB before the handover is complete. The SN status transfer message is sent in advance to prepare the target eNB for seamless data reception, eliminating the need to stop transmission during handover.
Solution Approach 2:
The source eNB continues transmitting downlink data and receiving uplink data throughout the handover process without interruption. Data forwarding to the target eNB occurs concurrently, ensuring continuous useful action without transmission delays.
2Loss of time
If the source eNB continues transmitting data after step 203, then transmission delay is reduced, but unnecessary data transmission and resource waste occur
Solution Approach 1:
The target eNB sends a data transmission stopping indication message to the source eNB to provide feedback on when data transmission should cease. This feedback mechanism allows the source eNB to continue transmission only as long as necessary, avoiding unnecessary resource consumption.
3Speed
If data is transmitted non-sequentially during handover, then transmission speed is improved, but data packet duplication and loss occur
Solution Approach 1:
Data packets are segmented with unique Sequence Numbers (SN) that allow the target eNB to identify and handle out-of-order packets. The SN status transfer message segments the data flow information, enabling reliable reassembly even when packets arrive non-sequentially.
Solution Approach 2:
The Sequence Number parameter is used to track and manage data packet order. By changing and monitoring the SN parameter, the system can detect duplicate packets and ensure data integrity while allowing high-speed non-sequential transmission.
Data Source
AI summary
The present application discloses a method and eNB equipment for supporting seamless handover. The method comprises the following steps of: receiving, by a target eNB, random access information or an RRC connection reconfiguration completion message from a UE; transmitting, by the target eNB, a data transmission stopping indication message to a source eNB; and, stopping, by the source eNB, transmitting downlink data to the UE, and/or stopping, by the source eNB, receiving uplink data from the UE. The present invention further provides several other methods and eNB equipments for supporting seamless handover. By the methods for supporting seamless handover provided by the present invention, the delay of data transmission and the unnecessary data transmission or unnecessary data monitoring of a source eNB can be avoided, the waste of resources and the power consumption can be reduced, and the missing and duplication transmission of data can be avoided.