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A method for low-track satellite network location update based on joint location area

A technology for network location and low-orbit satellites, applied in the field of satellite communications, can solve the problems of ignoring the diversification of mobile terminal mobility, the system impact cannot be ignored, and the overhead is large, so as to reduce the location update frequency and system resource consumption, save The effect of paging bandwidth

Inactive Publication Date: 2011-08-10
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when a call arrives at a mobile terminal (MT), the ground station must page the mobile terminal (MT) through all satellites covering it, and the signaling overhead is very large
[0007] The fourth scheme is based on (SAT, FES) expressing a location area (LA) for the area covered by a satellite and a ground station: the coverage area of ​​the location area (LA) is the smallest, but due to the continuous movement of the satellite, it increases The number of user location updates, the network spends a lot on user location updates
[0008] The above four location area-based location management methods only consider the balance of location update and paging overhead in the design, ignoring the diversification of mobile terminal mobility, which is an important factor affecting location management strategies.
Especially for some users who frequently reciprocate at the boundary of the location area, no matter which location area (LA) design method above is adopted, their frequent crossing will lead to a large amount of location update overhead in the system. In the actual environment, The impact of such users on the system cannot be ignored

Method used

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  • A method for low-track satellite network location update based on joint location area
  • A method for low-track satellite network location update based on joint location area
  • A method for low-track satellite network location update based on joint location area

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Experimental program
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specific Embodiment approach 1

[0017] Specific implementation mode one: the steps of this implementation mode are as follows:

[0018] Step 1: the location update controller of the mobile terminal (MT) is provided with a control module to control the user to initiate a location update operation;

[0019] Step 2: the mobile terminal (MT) is powered on to register with the network, and the home location register (HLR) and the visitor location register (VLR) of the ground station coverage area where the user is located in the network record the location information of the user;

[0020] Step 3: The boot mobile terminal (MT) in the network continues to receive the satellite and ground station location area identification codes. When the received two location area identification codes change, the user initiates a location update operation; the home location register (HLR) and The Visitor Location Register (VLR) updates its recorded user location information;

[0021] Step 4: When the network needs to deliver a ...

specific Embodiment approach 2

[0022] Specific implementation mode two: combination image 3 Describe this embodiment, the difference between this embodiment and specific embodiment 1 is that the control user initiates a location update operation in step 1; the location update code is a 3-bit structure, and TAG is a 1-bit identification bit, which is used to identify whether the terminal has received the location area identification code. Set to 1 if received, 0 otherwise. The SAI indicates whether the satellite location area identification code received by the user has changed. Set to 1 if changed, 0 otherwise. The FAI indicates whether the location area identification code of the ground station received by the user has changed. Set to 1 if changed, 0 otherwise. The remaining steps are the same as in the first embodiment.

specific Embodiment approach 3

[0023] Specific implementation mode three: combination figure 1 and figure 2 This embodiment is described. The difference between this embodiment and the first embodiment is that the home location register (HLR) in the network and the visitor location register (VLR) in the coverage area of ​​the ground station where the user is located in step 2 record the location information of the user.

[0024] The home location register (HLR) is set in the ground station, and the system only sets one home location register (HLR). combine figure 1 Explain the basic structure of the user location information data stored in the home location register (HLR) of the network, the user location information recorded in the home location register (HLR) includes the user identity information (MID), the ID of the user's home location register (HLR) (VID), and a 1bit flag, used to mark whether the user has turned on the registration, the number of bits occupied by the user identity information (MID...

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Abstract

The invention discloses a method of updating network locations of a satellite with a low earth orbit based on a joint location area and relates to the technical field of satellite communication. The method solves the problems of the location updating frequency and the loss of system resources and the reduction of a system paging bandwidth and includes the procedures as follows: firstly, a controlmodule is arranged on a location updating controller of a mobile terminal and used for controlling users to initiate the location updating operation; secondly, starting up a computer for registration: a home location register (HLR) in the network and a visitor location register (VLR) in an area covered by a user premise ground station are used for recording the location information of users; thirdly, a start-up mobile terminal in the network continuously receives location area identification codes from the satellite and the ground station; when both of the two received location area identification codes change, the users initiates a one-off location updating operation and the home location register (HLR) and the visitor location register (VLR) then update the recorded location informationof users; fourthly, a two-step paging method is adopted to connected with the terminal when the network is required to transfer a call to the users. The method of the invention can save the paging bandwidth used for establishing the call connection by the network.

Description

technical field [0001] The invention relates to the technical field of satellite communication, in particular to a method for updating a position based on a joint location area applied in a low-orbit satellite network. Background technique [0002] In the field of satellite communication, location update technology, as a key technology of low orbit (LEO) satellite mobile communication system, is related to the performance of the whole network. Currently in the mobile communication system, the most widely used location update method is to use a location area (Location area, LA). This strict method of dividing location areas cannot well adapt to the diverse mobility characteristics of mobile users, and consumes too much system resources for location updating. [0003] In the low-orbit satellite communication system, there are mainly four ways to divide the location area commonly used at present: [0004] The first solution is based on the user's geographic location: multiple...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/185H04W60/00H04W68/00
Inventor 张竹郭庆王振永
Owner HARBIN INST OF TECH