Ultra-Dense Network Handover Using Arrival Time Prediction
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Solution Overview
Problem
In ultra-dense networks, the frequent and rapid handovers between small cells lead to increased handover delays, which degrade network performance and user experience due to complex network structures and high user equipment speeds.
Innovation Solution
A handover method that includes predicting the arrival time of user equipment at a target base station and allocating resources accordingly, allowing for simplified access and reducing the need for a random access process, thereby minimizing handover delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If traditional handover procedures are used in ultra-dense networks, then handover control can be maintained, but handover delay increases and network performance deteriorates
Solution Approach 1:
The patent applies preliminary action by having the network side predict the arrival time of user equipment at target base stations in advance, and pre-allocate time-frequency resources before handover occurs. This preparation eliminates the need for random access procedures during actual handover, significantly reducing handover delay while ensuring resource availability and handover success.
Solution Approach 2:
The patent segments the handover process into distinct phases: prediction phase where arrival time is calculated, resource allocation phase where time-frequency resources are assigned, and execution phase where handover occurs. This segmentation allows each phase to be optimized independently, with resource allocation happening beforehand rather than during the critical handover moment.
2Area of stationary object
If small cells are densely deployed to strengthen coverage, then network capacity and coverage are improved, but handover frequency increases and handover delay accumulates
Solution Approach 1:
In dense small cell deployments, the patent continuously predicts arrival times and pre-allocates resources as user equipment moves through the network. This ongoing preliminary action ensures that even with frequent handovers between small cells, each handover can execute quickly without accumulated delay, maintaining the benefits of dense deployment.
3Speed
If user equipment moves at high speed through the network, then service coverage is maintained, but handover failure rate increases
Solution Approach 1:
For high-speed user equipment, the patent calculates arrival times at target base stations in advance and pre-allocates resources before the handover moment. This eliminates the timing uncertainty and resource contention that typically cause handover failures at high speeds, allowing reliable handovers even when user equipment moves rapidly between cells.
4Area of stationary object
If target cell radius is reduced to increase density, then network capacity increases, but handover frequency increases and delay increases
Solution Approach 1:
The patent compensates for the increased handover frequency caused by small cell radii by continuously performing arrival time prediction and resource pre-allocation. This ensures that despite more frequent handovers, each individual handover executes quickly with minimal delay, as resources are already reserved and the process is prepared in advance.
Data Source
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AI summary
A handover method and device in an ultra-dense network are disclosed. The method includes the following steps: A source base station sends a first message to a target base station, the first message carries an arrival time indication of a terminal, and the arrival time indication is used to indicate a time at which or a time range in which the terminal is to access the target base station. The source base station receives a second message fed back by the target base station, and the second message carries a granted resource that is allocated for the arrival time indication of the terminal. The source base station adds the granted resource to a command message, and sends the command message to the terminal. The terminal receives the command message sent by the source base station, and sends an RRC connection reconfiguration complete message to the target base station on the granted resource, to indicate to the target base station that the terminal is successfully handed over to, dual-linked to, or multi-linked to the target base station. Such a handover process simplifies an existing handover process, omits an existing random access process of a terminal to a target base station, reduces a handover delay, and improves communication quality.