Cell Handover Method With Pre-Allocated Resources
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Solution Overview
Problem
Current cell handover processes in LTE and NR systems experience delays due to the inability of terminal devices to perform uplink and downlink data transmission during the handover process, which fails to meet the 0ms delay requirement, resulting in degraded user experience.
Innovation Solution
Implementing a Make Before Break optimization and a nonrandom access method to allow continuous uplink and downlink data transmission during reconfiguration, along with pre-allocating uplink resources for handover responses, and establishing a user-plane data tunnel between source and target eNBs to ensure lossless handover and immediate resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a basic cell handover process is implemented in LTE or NR systems, then the terminal device can switch between cells, but uplink and downlink data transmission cannot be performed during the handover process, causing delay
Solution Approach 1:
The target eNB pre-allocates uplink resources to the terminal device before the handover is completed. This allows the terminal to immediately transmit the handover response and continue data transmission without waiting for resource allocation after handover, thereby reducing handover delay while maintaining connection reliability
Solution Approach 2:
The patent enables continuous uplink and downlink data transmission during the handover process by establishing a user-plane data tunnel between source and target eNBs. The terminal can transmit data to the source eNB which forwards it to the target eNB, ensuring uninterrupted data flow and eliminating transmission gaps during handover
2Device complexity
If uplink resources are allocated after handover completion, then resource management is simplified, but data transmission is interrupted during the handover process
Solution Approach 1:
Uplink resources are pre-allocated by the target eNB before handover completion, allowing immediate data transmission. This preliminary resource allocation maintains relatively simple resource management while ensuring continuous productivity during handover
Solution Approach 2:
The source eNB acts as an intermediary by receiving data from the terminal during handover and forwarding it to the target eNB. This maintains data transmission continuity without complicating the terminal's resource management, as the terminal continues to use existing uplink resources
Data Source
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AI summary
Provided are a cell handover method, a network node and a terminal device. The method includes that: a target node transmits a first resource to a terminal device, the first resource being used for transmitting or receiving data after the terminal device is handed over to the target node. In embodiments of the disclosure, the first resource is carried in a handover command or a handover acknowledgement, the terminal device can directly transmit or receive data on the first resource after the terminal device is handed over to the target node, thereby reducing a delay and improving user experience.