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Cell switching method and device

A cell handover and target cell technology, applied in the field of communications, can solve problems such as poor user experience and impact

Active Publication Date: 2014-07-23
DATANG MOBILE COMM EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such a large data interruption delay will have a very bad impact on user experience

Method used

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  • Cell switching method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0206] Such as Figure 7 As shown, it is a schematic flowchart of a cell handover method in a specific application scenario proposed by an embodiment of the present invention, which specifically includes the following steps:

[0207] in, Figure 7 Most of the steps in the Figure 4 Same, only different local steps are explained here:

[0208]A new process—a pre-synchronization process—is inserted between steps S703 and S704:

[0209] Step a. After determining that the candidate target access point is a satellite, the source eNB notifies the UE to perform pre-synchronization in the designated cell; the pre-synchronization message at least includes: identification information of the candidate target cell, such as a physical cell ID (Physical Cell Identify, PCI) and frequency points and other information.

[0210] In step b, the UE obtains its timing advance in the candidate target cell through a random access procedure (that is, establishes uplink synchronization).

[0211]...

Embodiment 2

[0223] Embodiment 2 is similar to Embodiment 1, the difference is that Figure 7 Step b of the pre-synchronization process: the satellite terminal calculates the timing advance required to establish uplink synchronization with the satellite based on the Global Navigation Satellite System (GNSS). There are two specific methods:

[0224] method 1:

[0225] 1) The target satellite periodically broadcasts its own current position information, such as the three-dimensional coordinates, polar coordinates or longitude, latitude and altitude of the satellite's current position. A possible location broadcast information design scheme is as follows:

[0226] Satellite height: 100-40000Km. It can be encoded as 16-bit information in units of Km.

[0227] Satellite longitude and latitude: 0.01 degrees can be used as the basic unit, and the longitude and latitude are encoded as 16-bit information respectively.

[0228] 2) The UE obtains the position information of the target satellite b...

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Abstract

The embodiment of the invention discloses a cell switching method and device. According to the technical scheme provided by applying the cell switching method and device, in the process of conducting data transmission at a terminal device and a service access point, if the service access point of the terminal device determines that cell switching needs to be carried out on the terminal device, the service access point indicates the terminal device to build presynchronization with the uplink of an alternate target cell, and the terminal device is made to obtain a timing advance value of the corresponding alternate target cell; then, cell switching is carried out on the terminal device according to the obtained timing advance value, so that long-time data interruption caused when the terminal device conducts synchronization with the uplink of the target cell after receiving a switching instruction for switching to the target cell is avoided, and the user plane data interruption time spent when cell switching is carried out on the terminal device, particularly large-span switching between cells such as earth satellites or satellites is shortened.

Description

technical field [0001] The present invention relates to the field of communication technologies, in particular to a cell switching method and device. Background technique [0002] In order to take advantage of the industrial advantages of the terrestrial mobile communication system, especially the LTE (Long Term Evolution) / LTE-Advanced (Long Term Evolution) system, the International Telecommunication Union (ITU) proposes to design future first-generation mobile communication systems based on terrestrial LTE and LTE-Advanced systems. The 4th generation satellite mobile communication system requires the terminal to reuse the chip design of the ground terminal as much as possible. [0003] The satellite mobile communication system usually has two methods according to the on-board processing capabilities of the satellite: [0004] One is satellite transparent forwarding mode, such as figure 1 As shown, the mobile communication access point (equivalent to the base station in th...

Claims

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Application Information

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IPC IPC(8): H04W36/08H04W56/00
CPCH04B7/1851H04W56/0005H04W56/0045
Inventor 鲍炜秦飞高秋彬康绍莉
Owner DATANG MOBILE COMM EQUIP CO LTD
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