KR100660141B1 - Moving type of satellite repeater and network system for satellite repeating using the satellite repeater - Google Patents

Abstract

The present invention discloses a mobile satellite repeater capable of satellite relay in a mobile state and a satellite relay system using the same.

According to the present invention, a satellite including an L band frequency band of 0.8GHz ~ 2GHz and located in the air over the service area to relay the signal of the frequency band; A mobile satellite repeater for securing a communication channel between the satellite and the satellite terminal in a portable and transport state; A satellite gateway for communicating with the mobile satellite repeater via the satellite on the ground; An RF converter for up-converting a frequency signal of a predetermined band transmitted to and received from the satellite gateway and performing a real time call by delaying a predetermined time; A base station (BTS) for receiving a signal transmitted and received by the RF converter through an optical cable and performing a communication connection according to a satellite communication service; Operation management of the base station (BTS), management of the service status of the H / W and S / W in the base station, allocation and configuration of resources for call traffic, collecting information on the operation of the base station (BTS), operation of the base station (BTS) operation A base station controller (BSC) for performing functions such as monitoring of a lower device related to the monitored and detected faults; A switch (MSC) connected to the base station controller (BSC) to perform functions such as circuit switching, incoming / outgoing relaying, handoff, roaming, etc. to provide mobile communication service to a satellite terminal subscriber; And a telephone network (PSTN) in which the satellite terminal and the call terminal communicate with each other in response to a switching signal of the switch MSC.

Therefore, according to the present invention, the satellite communication channel can be secured in an unspecified area from the change of coverage based on the geographical displacement of the mobile satellite repeater as the ship, vehicle, or individual can perform the satellite communication through the portable satellite repeater. It provides the effect of reducing the installation cost of the satellite repeater and provides the effect of maximizing the service area by interlocking the fixed satellite repeater and the mobile satellite repeater.

Satellite, Mobile, Relay, Ship, Marine, Coverage, Variable Time, Satellite Gateway

Description

Mobile satellite repeater and satellite relay system using the same {MOVING TYPE OF SATELLITE REPEATER AND NETWORK SYSTEM FOR SATELLITE REPEATING USING THE SATELLITE REPEATER}

1 is a view showing a mobile satellite repeater according to the present invention.

FIG. 2 is a diagram illustrating the remote station of FIG. 1.

3 is a view showing a satellite relay system using a mobile satellite repeater according to the present invention.

4 is a configuration diagram illustrating the RF converter of FIG. 3.

<Explanation of symbols for main drawings>

105: omnidirectional antenna 107: remote station

109: outdoor service antenna 111: indoor service antenna

113: connector 201,203: duplexer

205: wireless communication relay booster 207: controller

300: mobile repeater 301: satellite

305: satellite gateway 307: RF converter

309: base station 311: base station controller

313: switchboard 319: telephone network

401: variable time delay circuit section 403: up-down converter

407: RF Front End

The present invention relates to a satellite relay system, and more specifically, to build a satellite relay network consisting of a fixed satellite repeater and a mobile satellite repeater to increase the best call quality through a minimum relay infrastructure in the ground, the ocean, the mountains or remote areas. The present invention relates to a mobile satellite repeater and a satellite relay system using the same.

In general, a satellite communication network is a network constructed to allow subscribers to make or receive calls with their number and their satellite communication terminals anywhere in the world by using several satellites and earth stations on the global area. Say Wireless subscribers can make mobile phone calls with their mobile terminals.

These radiotelephones and mobile communications are largely divided into TRS and CT-2 services in the 800 MHz band, advanced mobile phone service (AMPS) in the 800-900 MHz band, time division multiple access (TDMA), and code division multiplexing. Cellular using code division multiple access (CDMA), personal communication services (PCS) in the 1.8GHz band, and GMPCS using satellites such as iridium and ICO. They form a transmission path between the subscriber and the switching center using radio technology in a specified frequency band. That is, a terminal is required at the subscriber side and a remote base station is provided at the switching station side for the radio transmission path configuration. These terminals and base stations are capable of modulating and amplifying the necessary information into radio frequency signals and transmitting them to free space, and receiving and demodulating the signals damaged by free space loss and radio section fading, and providing demodulated signals as necessary information. Has

However, in reality, since the wireless communication network cannot service all areas, there are some dead zones in the city as well as in the mountains or the ocean. In addition, there is a problem in that it is not possible to receive the wireless communication service subscribed to because the wireless communication standard protocol is different for each country and service provider. In addition, satellite communication is a service that provides voice and data communication using satellites. Since the conventional orbit satellites located 36,000km over the earth, voice communication is almost impossible due to voice delay. .

On the other hand, with the recent emergence of mobile satellite communications using low-orbiting satellites floating hundreds of kilometers above the Earth, satellite communications can provide the benefits of global service coverage. It must be installed by base station to implement satellite relay network. In particular, in places where it is not easy to install a repeater such as a ship satellite repeater or desert mainly using satellite communication has shown a limit of satellite communication. In order to overcome this limitation, enormous installation costs are inevitable, but the service coverage of satellite broadcasting is inevitably narrow in a situation where the number of users is extremely limited.

In addition, currently used satellites include the low-orbiting satellites, Iridium and Globalstar, and Inmasat, which is a high-orbiting satellite, but the satellite communication repeater for relaying communications with these satellites is fixed. By sticking to the location, the efficiency of the satellite relay system is not reduced because it cannot cope with the change in the trajectory of the satellite, and there is a problem that the subscriber has to pay an expensive satellite fee because the call must always go through the satellite.

The present invention has been made to solve the above problems, and an object of the present invention is to establish a flexible coverage utilizing a minimum number of repeaters through interworking between a fixed satellite relay system and a mobile satellite relay system, thereby providing satellite communication. The present invention provides a mobile satellite repeater and a satellite relay system using the same, capable of performing satellite communication at low cost due to the efficient operation of the system.

The mobile satellite repeater according to the first aspect of the present invention for achieving the above object comprises a housing having a predetermined shape and a body for supporting the cover, the housing being portable or mounted at a predetermined position; An omnidirectional antenna which communicates with a satellite and is installed in the housing to increase radiation efficiency to reduce signal attenuation in a specific direction, and to increase diversity by implementing diversity; An outdoor service antenna for performing transmission and reception with a satellite terminal in an outdoor state when the housing is formed in a portable structure; And a remote station for performing frequency separation and noise cancellation on the transmission / reception frequency signal between the outdoor service antenna and the omnidirectional antenna.

According to a preferred embodiment of the present invention, the remote station is characterized in that the in-door service antenna for performing transmission and reception with the satellite terminal in the In-door state is further connected.

The remote station may further include a duplexer which transmits a transmission frequency and a reception frequency separately among various radio signals of the satellite terminal and selects only a required frequency among many radio signals mixed with noise; After receiving the public radio signal by using the reception channel (Rx) and amplifying it to a predetermined level and filtering the received signal of the desired frequency band, after filtering the transmission signal of the desired frequency band by using the transmission channel (Tx) A wireless communication relay booster for radiating; And a controller for allocating a transmission signal of the satellite terminal introduced through the duplexer to any one of a plurality of channels and performing time division (TDMA) control of a communication signal for the allocated channel.

On the other hand, the satellite relay system using a mobile satellite repeater according to a second aspect of the present invention for achieving the above object, including the L band frequency band of 0.8GHz ~ 2GHz and located over the service area signal of the frequency band Satellite to relay the; A mobile satellite repeater for securing a communication channel between the satellite and the satellite terminal in a portable and transport state; A satellite gateway for communicating with the mobile satellite repeater via the satellite on the ground; An RF converter for up-converting a frequency signal of a predetermined band transmitted to and received from the satellite gateway and performing a real time call by delaying a predetermined time; A base station (BTS) for receiving a signal transmitted and received by the RF converter through an optical cable and performing a communication connection according to a satellite communication service; Operation management of the base station (BTS), management of the service status of the H / W and S / W in the base station, allocation and configuration of resources for call traffic, collecting information on the operation of the base station (BTS), operation of the base station (BTS) operation A base station controller (BSC) for performing functions such as monitoring of a lower device related to the monitored and detected faults; A switch (MSC) connected to the base station controller (BSC) to perform functions such as circuit switching, incoming / outgoing relaying, handoff, roaming, etc. to provide mobile communication service to a satellite terminal subscriber; And a telephone network (PSTN) in which the satellite terminal and the call terminal communicate with each other in response to a switching signal of the switch (MSC).

According to a preferred embodiment of the present invention, the RF converter includes a variable time delay circuit unit that can perform a real-time call by delaying the signal by a time difference, that is, a propagation delay time generated in the uplink and the downlink of the satellite; An up-down converter for receiving the signal received from the satellite body through a variable time delay circuit unit and converting the intermediate frequency signal into an intermediate frequency signal and converting the intermediate frequency signal received from the base station into an satellite up frequency signal; An RF front end for performing low noise amplification on the signal input and output from the up-down converter, and performing frequency conversion and power amplification; And a controller for performing time division control based on the airwave protocol.

In addition, the propagation delay time is characterized in that the 476mSec ~ 556mSec.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 is a block diagram showing a satellite repeater according to the present invention.

As shown, the mobile satellite repeater is composed of a cover 101 of a predetermined shape, preferably a hemispherical shape, and a body 103 for supporting the cover 101, and has a housing 100 that can be mounted or carried in a predetermined position. , An omni-directional or non-directional antenna 105 installed in the housing 100 to increase radiation efficiency to reduce signal attenuation in a specific direction, and to increase diversity by increasing diversity. And, when the housing 100 is mounted in a predetermined position, the indoor service antenna 111 for performing transmission and reception with the satellite terminal in the In-door state, and the housing 100 has a portable structure When the outdoor service antenna 109 and the indoor service antenna 111 and the outdoor service antenna 109 are configured to perform transmission and reception with the satellite terminal in an outdoor state, Performs frequency separation and noise cancellation on the transmission / reception frequency signal between the connector 113 for collective or selective connection, the outdoor service antenna 109, the indoor service antenna 111, and the omnidirectional antenna 105. It consists of a remote station 107 for the purpose.

The mobile satellite repeater has an L-band, i.e., a frequency communication band of 0.8 GHz to 2.0 GHz, which is advantageous for maritime communication and mobile communication in communication with a satellite, and an S-band of 2 GHz to 3 GHz or 3 GHz to 6 GHz as necessary. Of course, the C-band of can be used. On the other hand, the omni-directional antenna 105 may be installed along the outer circumferential surface of the hemispherical cover 101 of the plurality of antennas distributed in the same angle in a non-directional direction, in the present invention the position to track the displacement of the satellite For example, it is configured as a tracking drive type antenna, and is preferably installed or carried on a moving object having a geographical displacement, such as a ship or a vehicle, so that satellite relaying is performed in a mobile state.

Meanwhile, as shown in FIG. 2, the remote station 107 separates and transmits a transmission frequency and a reception frequency among various radio signals of the satellite terminal, and selects a duplexer that selects only a required frequency among many radio signals in which noise is mixed. 201 and 203, and after receiving the public radio signal by using the reception channel (Rx), amplifies it to a predetermined level, filters the signal of the desired frequency band and receives it, and transmits the desired frequency band by using the transmission channel (Tx) The wireless communication relay booster 205 for filtering and radiating a signal and the transmission signal of the satellite terminal introduced through the duplexer 203 are allocated to any one of a plurality of channels, and the communication for the assigned channel is performed. And a controller 207 for performing time division (TDMA) control of the signals.

The mobile satellite repeater configured as described above is installed in a vehicle or a ship or is portable from a user, performs communication through an L-band with a satellite, and has a communication channel of 800 MHz band with a satellite terminal. The duplexers 201 and 203 of the remote station 107 provided as the mobile satellite repeater may simultaneously communicate with up to eight satellite terminals and satellites through a plurality of channels, for example, eight channels, which are time-divided by the controller 207. That is, an eight-channel satellite terminal may be connected through the outdoor service antenna 109, or an eight-channel satellite terminal may be connected through the indoor service antenna 111. 8 channels are distributed to the 109 and the indoor service antenna 111 so that a satellite terminal can be connected to each channel.

When the mobile satellite repeater is mounted on the vessel, communication between the satellite terminal carried by the crew in the vessel and the satellite may be performed through the indoor service antenna 111 during operation of the vessel, and other satellite terminals sailing near the vessel and the satellite A communication channel can be formed. As described above, a plurality of satellite terminals connected to a plurality of channels include a plurality of kinds of noise generated during communication between satellites through the duplexers 201 and 203 for communication signals induced through the outdoor service antenna 109 or the indoor service antenna 111. Is removed and time-divided calls are made under the control of the controller 207.

At this time, the wireless communication relay booster 205 filters the signal of a predetermined frequency band during a call for each channel of the satellite and the satellite terminal period, and amplifies the filtered signal to a predetermined level so as to use a voice signal using a transmission channel and a reception channel. Or send and receive data. On the other hand, in another embodiment of the present invention, even if the mobile satellite repeater is to be carried by the individual to ensure the satellite communication channel from a plurality of subscriber stations located in the vicinity will not depart from the gist of the present invention.

When the mobile satellite repeater is carried from an individual, the satellite relay function may be performed when an individual carrying the mobile satellite repeater moves to an area where a satellite repeater is not installed or does not have sufficient coverage, such as a desert area or a mountainous area. Can be.

3 is a diagram illustrating a satellite relay network using the mobile satellite repeater. As shown, the satellite body 301 including the L band frequency band of 0.8GHz ~ 2GHz and located in the service area to relay the signal of the frequency band, to perform satellite communication with the satellite body 301 on the ground RF converter: 307 for up-converting a frequency signal of a predetermined band transmitted and received to and from the satellite gateway 305 and delaying a predetermined time to perform a real-time call. A base station (BTS) 309 for receiving a signal transmitted and received at 307 through an optical cable to perform a communication connection according to a satellite communication service, operation management of the base station 309, operation of H / W and S / W in the base station Its functions include managing service status, allocating and configuring resources for call traffic, gathering information about base station operations, monitoring base station operations, and monitoring sub-devices associated with detected failures. A base station controller 311 for performing, a switch for being connected to the base station controller 311 to perform functions such as circuit switching, incoming and outgoing relaying, handoff, roaming, etc. to provide mobile communication services to satellite terminal subscribers. (MSC: 313), the satellite 301 and the call terminal 321 is made to the telephone network 319 in communication in response to the switching signal of the switch 313.

Of course, the switch 313 includes a network interworking device (IWF: 317) for receiving protocol conversion from a wireless network to a wired network, and for supporting bandwidth conversion, quality of service (QoS) guarantee, and the like. . In addition, the satellite body 301 secures a communication channel with a plurality of mobile satellite repeaters 300, and the mobile satellite repeater 300 performs a call connection with a satellite terminal within a predetermined coverage area.

Meanwhile, as illustrated in FIG. 4, the RF converter 307 delays a signal by a time difference, that is, a propagation delay time, generated in the uplink and the downlink of the satellite body 301, and performs a variable time delay. The circuit unit 401 and the signal received from the satellite body 301 are received through the variable time delay circuit unit 401 and converted into an intermediate frequency signal, and the intermediate frequency signal received from the base station 309 is uplink frequency for the satellite. An up-down converter 403 for converting and outputting a signal, and an RF front end for performing low noise amplification of the signal input and output from the up-down converter 403, and performing frequency conversion and power amplification. And a controller 405 for performing time division control based on the airwave protocol.

The propagation delay time varies depending on the altitude of the satellite, and in the case of an iridium satellite located at 36,000 km, a propagation delay of approximately 476 mSec to 556 mSec is formed. Accordingly, the variable time delay circuit unit 401 implements time delay control according to the type of satellite. do.

The satellite communication network configured as described above has a mobile satellite repeater 300, which can be carried from a vessel or a vehicle in operation, or an individual, having a predetermined coverage and forms a displacement, and an installation radius of the mobile satellite repeater 300 is established. A plurality of satellite terminals provided therein form a communication channel with the satellite body 301 using the mobile satellite repeater 300 as a medium. When the satellite 300 is an iridium or a global star, communication between the satellite terminal and the satellite 301 is performed in an uplink frequency band of 1610 to 1626.5 MHz.

The satellite body 301 attempts to connect with the ground station through the downlink frequency (global style case) of 2483.5-2500 MHz to the satellite gateway station 305 in response to the satellite signal provided from the mobile satellite repeater 300. In this case, the RF converter 307 performs power amplification together with low noise amplification through the RF front end 407 and forms frequency conversion of a predetermined band for the input signal. Thereafter, the variable time delay circuit unit 401 controls a propagation delay of approximately 476 mSec to 556 mSec with respect to a satellite signal currently input, and converts and outputs the intermediate frequency signal through an up-down converter 403.

The controller 405 performs time division access (TDMA) control and analyzes a reception code according to a predetermined communication protocol for the satellite signal introduced through the up-down converter 403, and analyzes the result of the analysis through the optical cable. Send to 309. The base station 309 receives the satellite terminal information currently being accessed and the call connection information according to the call connection request. As the base station controller 311 transmits the base station information and the call connection information to the switch 313 in response to the call connection information, the switch 313 communicates with the call terminal 321 through the telephone network 319. Switch the call channel.

Therefore, it is possible to form a call channel between a plurality of satellite terminals proximate the corresponding coverage from the installation position or the movement position of the mobile satellite repeater 300 and the call terminals connected to the telephone network. Of course, when a call channel with a corresponding satellite terminal interlocked with a specific mobile satellite repeater 300 is secured from the call terminal 321, a call connection is possible based on the above process.

In addition, the satellite terminal used in the present invention may be a terminal having a TRS (TRS) function in order to secure the communication channel. Rather than securing satellite communication channels in the ocean, mountains, and remote areas, which are sufficiently spaced apart from the satellite gateway station 305, the TRS network can be used without the use of satellites on the ground or in close proximity to the ground. To secure the call channel used.

Such a TLS system is a system in which a plurality of channels are shared among a plurality of users so that a user can automatically select an empty channel among the plurality of channels and use the same. Therefore, the frequency utilization efficiency is high, the call quality is improved, and data communication and fax (FAX) communication are possible. At this time, the frequency band used is a frequency of 800MHz band.

The TLS system may give an individual number (Unique ID) to a mobile station (satellite terminal having a TLS function) for individual communication, and may make an all call with a group at a command station (Center). It has the advantage of being able to conveniently use in the areas of security, transportation, construction, and port because it has a group communication function and a function of providing a notification service in case of emergency.

While the invention has been shown and described with respect to specific preferred embodiments thereof, the invention is not limited to the embodiments described above, and is typically used in the art to which the invention pertains without departing from the spirit of the invention as claimed in the claims. Anyone with knowledge of the world can make many variations.

As described above, the mobile satellite repeater and the satellite relay system using the same according to the present invention enables a ship, a vehicle, or an individual to perform satellite communication through a portable mobile satellite repeater, thereby reducing the geographical displacement of the mobile satellite repeater. It is possible to secure satellite call channel in unspecified area from the change of coverage based on it, thereby reducing the installation cost of satellite repeater and maximizing the service area by linking fixed satellite repeater and mobile satellite repeater. do.

In addition, when the mobile satellite repeater is used in an area where a relay system such as the ocean or the desert is weak, the satellite channel can be allocated from the mobile satellite repeater in close proximity, thereby improving the quality of the maritime service.

Claims (11)

The mobile satellite repeater includes a housing having a predetermined shape and a body for supporting the cover, the housing being portable or mounted at a predetermined position; An omnidirectional antenna which communicates with a satellite and is installed in the housing to increase radiation efficiency to reduce signal attenuation in a specific direction, and to increase diversity by implementing diversity; An outdoor service antenna for performing transmission and reception with a satellite terminal in an outdoor state when the housing is formed in a portable structure; And And a remote station configured to perform frequency separation and noise cancellation on the transmission / reception frequency signal between the outdoor service antenna and the omnidirectional antenna. The mobile satellite repeater of claim 1, wherein the remote station is further connected with an Indic language service antenna for performing transmission and reception with a satellite terminal in an In-door state. The mobile satellite repeater according to claim 1, wherein the mobile satellite repeater has an L-band frequency communication band of 0.8 GHz to 2.0 GHz which is advantageous for maritime communication and mobile communication. 2. The mobile satellite repeater of claim 1, wherein the omnidirectional antennas are provided along a circumferential surface of the hemispherical cover in a non-directional manner and distributed at the same angle. The mobile satellite repeater of claim 1, wherein the omnidirectional antenna comprises a position tracking driven antenna capable of tracking the displacement of the satellite in a non-directional manner. The mobile satellite repeater of claim 1, wherein the housing is installed on a moving object having a geographical displacement such as a ship or a vehicle. The mobile satellite repeater of claim 1, wherein the housing is carried by a user to perform satellite relaying in a mobile state. The apparatus of claim 1, wherein the remote station comprises: a duplexer for separating and transmitting a transmission frequency and a reception frequency among various radio signals of a satellite terminal, and selecting only a required frequency among many radio signals in which noise is mixed; After receiving the public radio signal by using the reception channel (Rx) and amplifying it to a predetermined level and filtering the signal of the desired frequency band to receive, and filtering the transmission signal of the desired frequency band by using the transmission channel (Tx) A wireless communication relay booster for radiating; And A mobile satellite comprising: a controller configured to allocate a transmission signal of a satellite terminal introduced through the duplexer to any one of a plurality of channels and to perform time division (TDMA) control of a communication signal for an assigned channel Repeater. According to claim 1, In the satellite network structure using the mobile satellite repeater, A satellite including an L band frequency band of 0.8 GHz to 2 GHz and positioned above a service area to relay a signal of a corresponding frequency band; A mobile satellite repeater for securing a communication channel between the satellite and the satellite terminal in a portable and transport state; A satellite gateway for communicating with the mobile satellite repeater via the satellite on the ground; An RF converter for up-converting a frequency signal of a predetermined band transmitted to and received from the satellite gateway and performing a real time call by delaying a predetermined time; A base station (BTS) for receiving a signal transmitted and received by the RF converter through an optical cable and performing a communication connection according to a satellite communication service; Operation management of the base station (BTS), management of the service status of the H / W and S / W in the base station, allocation and configuration of resources for call traffic, collecting information on the operation of the base station (BTS), operation of the base station (BTS) operation A base station controller (BSC) for performing functions such as monitoring of a lower device related to the monitored and detected faults; A switch (MSC) connected to the base station controller (BSC) to perform functions such as circuit switching, incoming / outgoing relaying, handoff, roaming, etc. to provide mobile communication service to a satellite terminal subscriber; And And a telephone network (PSTN) in which the satellite terminal and the communication terminal communicate with each other in response to a switching signal of the switch (MSC). 10. The apparatus of claim 9, wherein the RF converter comprises: a variable time delay circuit unit capable of performing a real time call by delaying a signal by a time difference generated from uplink and downlink of the satellite, that is, a propagation delay time; An up-down converter for receiving the signal received from the satellite body through a variable time delay circuit unit and converting the intermediate frequency signal into an intermediate frequency signal and converting the intermediate frequency signal received from the base station into an satellite up frequency signal; An RF front end for performing low noise amplification on the signal input and output from the up-down converter, and performing frequency conversion and power amplification; And A satellite relay system using a mobile satellite repeater, characterized in that consisting of a controller for performing time division control based on the airwave protocol. 11. The satellite relay system according to claim 10, wherein the propagation delay time is 476mSec to 556mSec.

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