Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
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
View PDF6 Cites 66 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
Problems solved by technology
Such a large data interruption delay will
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more
Image
Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
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...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
PUM
Login to view more
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
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
Application Information
Patent Timeline
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to view more 
Login to view more