System and method for reducing rate of call failure in multibeam communication system

FIELD: communications engineering.

SUBSTANCE: proposed system has user terminal, gateway, and plurality of beam sources radiating plurality of beams, communication line between user terminal and gateway being set for one or more beams. Proposed method is based on protocol of message exchange between gateway and user. Depending on messages sent from user to gateway, preferably on pre-chosen periodic basis, gateway determines most suited beam or beams to be transferred to user. Messages sent from user to gateway incorporate values which are, essentially, beam intensities measured at user's. Gateway uses beam intensities measured at user's to choose those of them suited to given user. Beams to be used are those capable of reducing rate of call failure and ensuring desired separation level of beam sources.

EFFECT: reduced rate of call failure in multibeam communication system.

20 cl, 27 dwg

 

The technical field

The present invention relates to the field of wireless communication. In particular, the present invention relates to a method of reducing the frequency of drop calls in a wireless communication system having a multi-beam communication lines.

Prior art

There are many different wireless communication systems with multi lines of communication. One example of such systems is a satellite communication system. Another example is a cellular communication system. The satellite communication system includes one or more satellites for transmission of communication signals between the gateways (also called the "communication station" or "base stations") and the user terminals. Gateways provide a connection line for connecting a user terminal to other user terminals or users of other communication systems, such as the public switched telephone network (PSTN). The user terminals may be fixed or mobile, such as mobile phone, and can be located near the gateway or away from him.

The satellite can receive signals and transmit signals to the user terminal if the user terminal is in a service area of the satellite. The service area of the satellite is a geographical region on the earth's surface, Pokrywa the range of satellite communication system. In some satellite systems, the service area of the satellite is geographically divided into "rays" through the use of antennas forming a set of rays. Each beam covers a certain geographic area in the service area of the satellite.

In some satellite communication systems use signals with spread spectrum and multiple access code division multiplexing (mdcr), as described in U.S. patent No. 4901307 on "communication System multiple access spread spectrum using satellite and ground Retranslator", issued February 13, 1990, and U.S. patent No. 5691174 "Method and apparatus for use transmit power full spectrum communications system spread spectrum for tracking time and energy for the individual subscriber", issued November 25, 1997, the rights to which are owned by the assignee of the present invention and the contents of which are incorporated here by reference.

In communication systems that use mdcr apply a separate communication lines for transmission of communication signals to the gateway or base station and the gateway or base station to the cellular system. A direct line of communication refers to the communication signals transmitted from the gateway or base station to the user terminal. The reverse link refers to the communication signals, which are transmitted from the terminal user is referred to the gateway or base station. In cases where you want satellite diversity, the gateway establishes two or more straight lines for a given user terminal, and each is a direct link is established by the beam from different satellites. For example, in the configuration with the separation of the two satellites, the first direct communication line is established by the beam emitted by the first satellite and the second is a direct link is established by the beam emitted from the second satellite. In the above example, the user terminal receives information or data from the gateway, the first and the second beam. The spacing of satellites provides improved system performance, because it reduces the likelihood of disruption of communication lines or calls. For example, if the beam supporting the first direct line of communication that is blocked by the obstacle (for example, tallest building), the connection between the user terminal and the gateway will continue without interruption on the second straight line. User blocking the beam will remain invisible. Therefore, in the General case in multibeam systems due to the diversity of sources of beams is desirable.

In satellite communication systems, where the position of the satellites are not stationary relative to some point on the earth's surface, the geographic area covered by this satellite is constantly changing. As a result, the th user terminal, which at one point was in the zone of action of a particular beam of a specific satellite, the next time you might be within range of another beam of the same satellite and/or other beam of another satellite. In addition, because the satellite connection is wireless, the user terminal can freely move from place to place. Thus, even in systems where the position of the satellites are stationary relative to some point on the earth's surface, it is convenient to the user terminal covered by different beams. Therefore, if the communication line between the user terminal and the gateway are installed on the first beam and the line connection is not established other rays before the user terminal will no longer be covered by the first beam, then at some point the user terminal will no longer be able to communicate with the gateway using the established communication line. In the active call between the user terminal and the gateway will be lost. Drop calls in the communication system is a serious problem for service providers who are trying to provide communication services without interruption. This problem of loss of challenges may occur when mobile users move from place to place in sectioned cells terrestrial cellular systems St is zi. This is where cells are divided into two or more service areas smaller covered by the signals differ from each other in the frequency or in the case of using different code spaces. In these cases, mobile users can move along the borders of the sectors within a cell or repeatedly to cross these boundaries depending on such factors as the size of the cell and sector, and characteristics of the local physical environment.

Therefore, there is a need for a system and method for reducing the frequency of failure of the challenges in multi-beam communication system. Such system and method should maintain the required level of diversity of sources of beams, further increasing the reliability of the communication system.

The invention

The present invention provides a system and method for reducing the frequency of drop calls in multibeam communication system having a user terminal, the communication station to transmit information to the user terminal and receiving information from the user terminal and the variety of sources of beams, with each source emits rays many rays and line of communication between the user terminal and the communication station is installed on one or more rays. In addition, the system and method corresponding to the present invention, supports the have the desired level of diversity of sources of radiation.

The method according to the present invention is based on the message exchange Protocol between the communication station and the user terminal. Based on the messages sent from the user terminal to the communication station, the communication station can determine the most suitable e-beam(s) to transmit information or data to the user terminal. Messages sent from a user terminal to the communication station, contain values that represent the intensity of the rays, measured at the user terminal. The link station uses these values to select

the most suitable beams that should be used as the communication line between the communication station and the user terminal. The rays that should be used, the rays, which when used, reduce the frequency of drop calls and provide the required level of diversity of sources of radiation.

Method according to one variant of the present invention includes: (1) transmission from the communication station to the user terminal messages masks rays (SSL), which contains many IDs rays, where each ID rays identifies the beam currently available for communication station; (2) periodic measurement of the user terminal intensity of each beam, identified in the sector; (3) periodic transmission from thermes is Nala the user to the communication station control messages about the measurement of the intensity (FIAC), contains many values of the intensity of the rays, where each value of the beam intensity is a function of the measured intensity of one of the rays identified in the sector; (4) the choice of stations on the basis of the intensity of the rays in FIAC one or more beams that should be used as the communication line between the communication station and the user terminal (that is, the communication station selects a new set of active rays); (5) the transfer from the station connection information for all rays within the new set of active rays; (6) the transmission from the communication station to the user terminal reports the direction switch communication channels (CQI), if one or more beams selected in step (4), is not the same beam or the same rays that are in the current set of active rays, where the current set of active rays consists of one or more beams, which has already established line of communication between the communication station and the user terminal; and (7) the receiving station communication message regarding the completion of the switching of the communication channels (SSPC)transmitted from the user terminal after the user terminal has received information about each of the rays in the new set of active the rays.

Based on the CQI of the user terminal may determine one or more beams that link station selected in step (4) and calorieladen be used as the communication line between the communication station and the user terminal. In one embodiment, the CQI includes the ID of the rays corresponding to each beam selected by the communication station in step (4). In another embodiment, CQI includes a set of added-rays and a set of excluded rays. Set added rays includes an identifier of rays for each beam in the new set of active rays, which is not in the current set of active rays. The set of excluded rays includes an identifier for each beam in the current active set of rays, which is not in the new set of active rays.

According to one variant, the set of values of the intensity of the beams entering at FIAC, includes a set of values corresponding to the most intense beam of each satellite, identified in the SSL. In another embodiment, the intensity of the rays in FIAC are configured values of the intensity of the rays.

In one embodiment, the step of selecting at stations one or more beams that should be used as the communication line between the communication station and the user terminal, includes: 1) selection of the most intense beam in FIAC; (2) the definition of the intensive alternative beam, FIAC, where alternative beam is a beam emitted from another satellite, and not to those which emits a beam selected in step (1); and (3) the choice of the intensive alternative beam, FIAC, if the intensity itself is th intense beam in FIAC minus the intensity of the most intense alternative beam FIAC is less than the threshold value.

In another embodiment, the step of selecting one or more beams, on which a communication line, includes: (1) the selection of the most intense beam in FIAC; (2) the definition of the intensive alternative beam in FIAC; (3) the choice of the intensive alternative beam, FIAC, if the intensity of the most intense beam in FIAC minus the intensity of the most intense alternative beam FIAC is less than or equal to the first threshold value; (4) the definition of the intensive alternative beam in the current active set, where the alternative beam in the current active set is a beam in the current active set, which is radiated by another satellite, and not to those which emits a beam selected in step (1), if the intensity of the most intense beam in FIAC minus the intensity of the most intense alternative beam FIAC is greater than the first threshold value; and (5) the choice of the intensive alternative beam in the current active set, if the intensity of the most intense beam in FIAC minus the intensity of the most intense alternative beam in the current active set is less than or equal to the second threshold value. In one embodiment of the present invention, the second threshold value greater than the first threshold value.

In another embodiment, the user terminal continuously smartinspect of each beam in the current active set. If the intensity of the beam in the current active set is less than the intensity of the beam, specified in the previous FIAC, to a predetermined value and remains within a certain time interval, then the user terminal will pass on the link station new FIAC.

Next, with reference to the drawings in detail describes additional characteristics and advantages of the present invention, and the structure and operation of various embodiments of the present invention.

Brief description of drawings

The drawings included in the description and its part, illustrate the present invention and together with the description additionally disclose the principles of the invention and allow the specialists in the art to implement and use the present invention. In the drawings, the same reference position indicate identical or functionally similar elements. Thus the leftmost(s) number(s) reference position identifies the drawing in which this reference position appeared for the first time.

Figure 1 - example of a wireless communication system constructed and operating according to one variant of the present invention;

Figa - example of satellite service area according to one variant of the present invention;

Figw - promising zobrazeniearly direction of the signal beam between the base station 1 and the ground surface;

Figs an example of a pattern signal to the base station of figure 1 with the standard theoretical boundaries of sectors and their deviations;

Figa and 3B - position of the satellite relative to the user in the first and second times, respectively;

Figs and the 3D position of the user on figa and 3B satellite service in the first and second times, respectively;

Figa and 4B - position of the first satellite and the second satellite relative to the user in the first and second times, respectively;

Figs and 4D user's position on figa and 4B in the first and second satellite service in the first and second times, respectively;

Figa and 5B, the switching procedure of the communication channels of the beams according to a preferred variant of the present invention;

Figa - message-rays;

Figw - examples of measured values of the intensity of light;

Figs - control setup messages;

Fig.6D - example-configured values of the intensity of light;

File is an example of a control message about the measurement of the intensity (FIAC);

Fig.7 is an example of the procedures used by the user terminal for establishing content FIAC;

Fig - the procedure used by the gateway when selecting beams for the new active set according to the first Varian is y;

Fig.9 is a procedure used by the gateway when selecting beams for the new active set according to the second variant;

Figure 10 - example of message flow between the gateway and the user terminal;

11 is an example of a transceiver for the user terminal;

Fig is an example of the control unit to the user terminal;

Fig are examples of the components of the gateway used when implementing the algorithm switching of communication channels on the rays;

Fig is an example of a selector of the gateway.

A detailed description of the preferred variants of the invention

I. Introduction

The present invention is suitable for use in multipath communication systems. Such communication systems include systems using orbital satellites or cell cell, divided into a large number of sectors. However, specialists in the art it is obvious that the concept of the present invention can be used in a variety of satellite systems, even if they are not used for communication. The present invention can also be applied in cells, using different partitioning schemes cells into sectors, even if their use is not related to the connection.

Below detail the preferred embodiment of the invention. Although here are concrete steps, configuration and schema, which should be borne in mind, that this is done only for illustration. Specialists in the art it is clear that can be used in other steps, configurations and schemes, not beyond the nature and scope of the present invention. The present invention may find application in a variety of information systems and communication systems, including systems for positioning, and satellite and terrestrial cellular telephony system. The invention is preferably used in wireless communication systems, spread spectrum and mdcr to provide services to mobile or portable telephone.

II. A typical communication system

An example of a wireless communication system, which can find application in the present invention, is shown in figure 1. It is assumed that the communication system uses signals of the type mdcr, but for the present invention it is not required. In communication system 100 shown in figure 1, shows one base station 112, two satellites 116 and 118 and two corresponding gateway or hub 120 and 122, which provide communications with remote terminals 124, 126, 128 users. Typically, base stations and satellites/gateways are components of separate communication systems, defined as terrestrial communication system and the satellite communication system, although this is f necessarily. The total number of base stations, gateways or satellites in such systems depends on the required system capacity and other factors known to specialists in this field of technology.

The terms "base station" and "gateway" are sometimes used interchangeably, each of which represents a stationary Central station connections and gateways, as is customary in the art, a specialized base stations, which send messages through satellite repeaters, while the base station (sometimes referred to as cell sites) use a terrestrial antenna for sending messages in adjacent geographic regions. Gateways using corresponding equipment decide the number of service tasks, maintaining a satellite communication line, and a node control centers also usually have a number of functions when interacting with gateways and moving satellites. However, the present invention may find application in systems where the communication stations are either gateways or base stations.

Each terminal 124, 126 and 128 user includes wireless communication, for example, a cellular telephone, a data transceiver, or a pager or receiver to determine the location, and such a device request may be portable, mounted on the vehicle, or stationary. Here, the user terminals shown in the form of a portable telephone apparatus 124, the apparatus mounted on the vehicle, 126 and stationary apparatus 128. Sometimes in some communication systems, depending on the preferences of the user terminals also referred to as subscriber units, mobile stations, or simply "users" or "mobile phones".

In the General case, the rays from the source of light (such as base station 112 or satellites 116 and 118) cover different geographic areas in a predetermined directional diagrams. Beams at different frequencies, which are also called channels mdcr or "sublocale", can be directed in such a way as to overlap the same region. Specialists in this field of technology is also clear that formed by the rays of the area of coverage or service, for multiple satellites or directional antennas to multiple base stations can be designed in such a way that depending on the configuration of the communication system and the type of services offered, as well as depending on, is there space diversity, fully or partially overlap in a given region.

Although in the drawing for clarity shown only two satellites, currently proposed by mnogozvuchni the new communication system, where, for example, using the order of 48 or more satellites rotating in eight different orbital planes in low-earth orbit (IEO) for servicing a large number of users ' terminals. However, specialists in the art should be obvious how to apply the principles of the present invention to various configurations of satellite systems and gateways. We are talking about other orbital parameters and configurations of satellites, for example, those that use satellites in geostationary orbits, when switching rays usually occurs as a result of movement of the user terminals. You can also use a variety of different configurations of base stations.

Figure 1 shows several possible trajectories of signals for communication between terminals 124, 126 and 128 users and the base station 112 or through satellites 116 and 118 via gateways 120 and 122. Line the base station - terminal user are shown by lines 130, 132 and 134. Lines of communication satellite - user terminal between satellites 116 and 118 and the user terminals 124, 126 and 128 are shown by lines 138, 140, 142 and 144. Line gateway - satellite" between the gateways 120 and 122 and satellites 116 and 118 are shown by lines 146, 148, 150 and 152. Gateways 120 and 122 and the base station 112 can be used as part of a simplex or duplex the second communication system or simply to send a message/information or data to the terminal 124, 126 and 128 users.

On figa shows an example pattern 202 satellite beams, also known as the service area. As shown in figa given as an example of the service area 202 of the satellite includes sixteen rays. Each beam covers a certain geographic area, although is usually some overlap of the beams. Shown in figure 2, the service area of the satellite includes an inner beam (beam 1), intermediate rays (rays 2-7) and external rays (rays 8-16). This pattern of rays is a specific predefined chart that is used to serve users located in the inner parts of the service area where the signal strength is lower because of the natural effect of "decay", created by the Earth's surface, without any added noise. The rays are shown as non-overlapping geometric shapes only for purposes of illustration. However, specialists in the art it is obvious that in various projects communication systems can be used in other pattern and other geometric shapes.

As shown in figv, base stations or cell sites in a given communication system (100)including a base station 112, emit rays or signals in the cell 220, covering pre-determined who left the service area on the Earth's surface in accordance with the signal intensity and terrain. Cell 220 consists of one common coverage area formed by a number of individual beams or signals that create sectors 222, usually having a wedge shape. Here the cell 220 is formed with a set of six sectors 222, not all of which have the same size or dimensions. However, as known to experts in the art, can be used a variety of charts, sectors and sector sizes. As discussed below, the user can move from position X in one sector 222 in the position Y in the neighboring sector 222 along the path shown by line 224. This is either the result of movement of the user terminal or change coverage sector, or the result of both reasons.

An example of a chart with sectors shown in detail figs. This drawing shows the number of sectors S1-S6, forming a pie chart or cell 220. Here it is shown that the cell has edges irregular shape that depends on the characteristics of the radiation signal repeater and antenna systems, as well as the characteristics of specific areas or facilities (on site), what is known by the experts in this field of technology. Shown in the drawing, the sectors do not necessarily have the same dimensions and may have a corresponding coverage area, configurable during operation of the system is s connection. Rays or signals sectors also create overlapping sectors or regions of the coating between adjacent sectors, with energy beams during transmission is usually selected so that it is quickly reduced at the edges or boundaries, to reduce the coverage overlapping signals. Overlapping borders to neighboring sectors shown continuous and dashed lines. Each neighboring sector this example uses a different PN (pseudosolenia) codes or code offset like satellite sublocal. Specialists in this field of technology is known for these types of directional diagrams and methods of frequency allocation and PN code used to generate these charts.

Figa - 4D illustrate formulated by the authors of the invention the problem, which prompted the present invention. On figa shows the position of the satellite 118 relative to the user 302 in the first time, and figv shows the position of the satellite 118 relative to the user 302 for the second time. Figs is a top view user 302 and beam satellite beams in the first time, and fig.3D shows a top view user 302 and beam satellite beams for the second time. As shown in figs and 3D, first PTO is t time the user 302 largely overlaps the sixth ray satellites 118, and the second point in time, the user 302 largely overlaps the third beam of the satellite 118. The first time the terminal 124 of the user discovers the third ray as having the most intense signal. Therefore, if the second time for the active call specified by the sixth ray will not be executed "switching channels" (third ray), the call may be lost.

On figa-4D shows the diversity of sources of radiation. On figa shows the locations of the satellites 118 and 116 relative to the user 302 in the first time, and figv shows the locations of the satellites 118 and 116 relative to the user 302 for the second time. On figs shows a top view user 302 and beam satellite beams in the first time, and fig.4D shows a top view user 302 and beam satellite beams for the second time. As shown in figs and 4D, the first time the user 302 largely overlaps the first beam of the satellite 118, and the second time the user 302 largely overlaps the fifteenth ray satellites 116 and fourteenth ray satellite 118.

The problem identified by the inventors, is that it is easy to determine the most suitable beam(s) to establish lines of communication, if there is an exact detail rmacy about where is the user terminal in the service area of the satellite. But the gateway, which selects the beam(s) for the establishment of a communication line, has no information about the location of the user terminal. In addition, even if the user's location is known, the presence creating obstacles of physical objects, such as trees, buildings, etc. can lead to the inability to use, the best beam(rays)". In this regard, the inventors have developed a procedure for switching communication channels from one beam to another to select the most appropriate beam(rays) for receiving the graphics in the user terminal, provided that the position of the user terminal is unknown, and there is a possibility of blocking the beam.

This procedure aims at reducing the frequency of switching of the communication channels and frequency of drop calls, while maintaining the required level of diversity of sources of radiation. The procedure is based on the message exchange Protocol between the gateway and the user terminal. Based on the messages sent by the user terminal to the gateway, the gateway can determine the most suitable beam(rays) to pass information to the user terminal. Messages sent from the user terminal to the gateway, contain values that represent the intensity of the rays, as measured at the terminal of the user.

III. Op is a description of the procedures for switching communication channels from one beam to another

The switching procedure of the communication channels from one beam to another is described with reference to flowchart 500 shown in figa and 5B. This procedure assumes that through the beam is initially at least one communication line between the user terminal (TA) and the gateway (SHL). In other words, the gateway selected beam to send it data or information in the user terminal.

The switching procedure of the communication channels from one beam to another begins with step 504. In step 504, the gateway transmits the message mask rays (magnesium) in the user terminal for fixed line(line) connection. SSL contains a list of identifiers rays. Each beam ID in the list determines the beam on which the gateway can transmit data or information. In addition, to make the SSL in the user terminal, the gateway may send to the user terminal control configuration message (STOs). The SPE contains one or more control settings. The control settings are used for load balancing and are discussed in detail below in connection with step 508.

The gateway periodically performs step 504. For example, the gateway can send the updated SSL every minute. Interval of one minute was chosen because approximately every minute of the gateway becomes available one or more new rays.

The piano is GA shows an example of a magnesium 600. As shown in figa, magnesium 600 consists of a list of identifiers rays 602-614. Each ID 602-614 defines a pair of "Sputnik - ray". For example, the first identifier beam 602 in the SSL 600 determines the first beam from the first satellite and the second identifier beam 604 determines the third beam from the first satellite.

The user terminal measures the intensity of each beam, identified in the most recent SSL received from the gateway (step 506). On FIGU shows examples of measured values of the intensity of the rays to rays that are defined in the SSL 600. In one embodiment, the user terminal measures the intensity of the beam by measuring the amount of energy in the control signal associated with the beam. To ensure the initial system synchronization and tracking time, frequency and phase of the other of the signals transmitted by the gateway, the user terminals using the pilot signals. Typically, each gateway transmits one pilot signal is used for each frequency, defined here as the channel mdcr or sublots, which is used by all user terminals, receiving signals from the gateway on this frequency. The intensity of the pilot signal can be measured by one of several known ways. For example, one such method is disclosed in patent application U.S. No. 08/722330 "Method and apparatus for transmission service in SOS the days the service area of a communication system" dated September 27, 1996.

After measuring the intensity of the rays of the terminal user can choose to configure one or more measured values of the intensity of the beams using one or more control values of the settings that you can choose to be sent from a gateway in the SPE (step 508). The control settings are used for load balancing. The control setting will compensate for the difference in the intensity of the rays emitted from a specific satellite. For example, there are cases when the external rays are more intense than the inner or intermediate beams. Therefore, no reference values configure the gateway to establish lines of communication will choose the external rays more often than other rays. This can create a problem with load balancing. Therefore, load balancing on beams, the gateway sends to the user terminal STOs to adjust the intensity of the beam used.

On figs shows an example of the SPE. As shown in figs, SPE 650 includes one or more setting values corresponding to one or more rays that are listed in the SSL 600. For example, the SPE 650 contains the setting for the eleventh ray of the first satellite and the setting value for the sixteenth ray of the second satellite. The SPE can be transmitted to the gateway at any time. In most cases, the SPE is asiletsa as part of the SSL. The user terminal adds the values to the corresponding measured values of the intensity of the rays. On fig.6D shows the configured values of the intensity of the rays to rays, identified in the SSL 600 on the basis of the SPE 650.

After step 508, the process proceeds to step 510, where the user terminal transmits to the gateway control message about the measurement of the intensity (FIAC). It should be noted that steps 506-510 performed by the user terminal periodically. The selection of the appropriate period is very important. If the user terminal performs the measurement and displays the message too often, then he will be in range of the same beam(rays) and, therefore, to give messages about the same signal level. This leads to inefficient loading of the channels of the graph, which is sending messages about the measurements because the user terminal transmits information, which has not changed. In addition, unnecessarily consumes resources for data processing in the user terminal and the gateway. On the other hand, if the user terminal displays a message on too much time or too long a period, then the user terminal may miss a "good" beam.

In one embodiment, the selection period is performed by setting the parameters for measuring the feudal system and simulate the resulting beams and displacement. Thus, based on the specified configuration (number) satellites and "ephemeris" (navigation and location) can predict the displacement and frequency changes for the rays. On this basis, it is possible to obtain a reasonable prediction of the appropriate period. To configure this period, if required, you can also use usage data systems in the past. In one embodiment, the specified period is ten seconds. That is, every ten seconds, the user terminal transmits to the gateway FIAC.

FIAC transmitted from the user terminal to the gateway, contains one or more IDs rays of magnesium 600 and the corresponding values of the intensity of the rays. The corresponding values of the intensity of the rays can be a configured or unconfigured intensity values. In one embodiment of the invention FIAC contains up to six identifiers rays together with the corresponding values of the intensity of the rays. However, you can use a different number of points depending on such known factors as the complexity of the system, computing power, memory capacity, etc. of the Contents shown in example FIAC 660 shown in figa.

In the block diagram 7 shows a preferred procedure used in the user terminal to select one or multiple beams (one who or several identifiers rays of magnesium 600 and the corresponding values of the intensity of the rays) for inclusion in the FIAC. The procedure 700 is designed to achieve the desired separation of the satellites. Therefore, FIAC is added at least one beam from each satellite, identified in the SSL, which is located in the vicinity of the user terminal. For example, if the SSL identifies three different satellites, each of which is in the vicinity of the user terminal, then the FIAC will contain at least three ID rays and at least three corresponding values of the intensity of the rays, where any of the at least three identifiers determines the beam from the other satellites of these three satellites.

The procedure 700 starts at step 704. In step 704, the user terminal uses the configured measured intensity of rays to determine the "most intense" beam emitted from each satellite, identified in the SSL. "The most intense" beam is a beam having the greatest configured value of the intensity. For each beam is determined in step 704, the user terminal includes at FIAC identifier of each beam and corresponding to the configured value of beam intensity (step 706). In the next step, the user terminal determines whether additional values in the FIAC (step 708). The user terminal determines this by subtracting the amount the beam is th at FIAC from the maximum number of rays, which can be added to the FIAC. In a preferred embodiment, the maximum number of beams that can be included in the FIAC is six. If FIAC can be added rays, then control proceeds to step 710; otherwise, the procedure ends. In steps 710 and 712, the user terminal selects the most intense beam, not added to FIAC, and adds the ID of this beam and the corresponding value of beam intensity in the FIAC. After step 712, control returns to step 708. In another embodiment, the user terminal when the procedure 700 uses non-preset values of the intensity of the rays. Therefore, FIAC may contain unconfigured or configured values of the intensity of the rays.

After taking FIAC from the user terminal to the gateway determines a new set of active rays (step 512). A new set of active rays is a set of rays that must be used as the communication lines between the gateway and. the user terminal. On Fig and 9 shows two procedures (800 and 900), which can be used by the gateway in step 512 (i.e. the definition of a new set of active rays). The procedure 800 is called here coding scheme (CPRS), and the procedure 900 - two-threshold circuit with hysteresis (DPSG). First will be described OPS (procedure 800), and ZAT is m DPSG (procedure 900).

The procedure 800 starts at step 804. In step 804, the gateway chooses the most intense signal in the FIAC and adds the ray in the new list of active rays. In other words, the gateway selects the largest value of beam intensity from FIAC, determines the beam that corresponds to the selected value, and adds the ray in the new list of active rays. Before step 804 the new set of active rays is set to be a "no damage." That is, initialized a new set of active rays, which does not contain any rays.

In step 806, the gateway determines the most intense "alternative" ray, FIAC, if available. "Alternative" ray is any satellite beam, FIAC, which is emitted not by satellite, which emits a beam located in the new active list. Therefore, the most intense "alternative" ray, FIAC is an alternative beam having the maximum value of the intensity of the beam compared to the other alternative-rays. To determine the most intensive alternative beam in FIAC gateway first selects a subset of values from FIAC, where a subset of values includes all values in FIAC, which correspond to the beam emitted from the wrong satellite which emits a beam that is included in the new active set. Then, the gateway selects the largest value from this subset. Following this, the gateway determines the beam,which corresponds to the value selected in the previous step.

If the most intensive alternative beam exists, then at step 808; otherwise, the process ends. In step 808, the gateway compares the intensity of the most intense beam (ISIL), FIAC (i.e. beam selected in step 804) with the intensity of the most intense alternative beam (ISEAL) (i.e. beam selected in step 806). If ISIL minus ICIAL less than or equal to the first threshold (T_1), then the gateway adds the most intensive alternative beam at FIAC in a new set of active rays (step 810), otherwise the procedure ends, and a new set of active rays will contain only the most intense beam at FIAC. In a preferred embodiment, T_1 is about 4 dB. But other variants are possible, for example T_1, 0 dB, or infinitely large value T_1, and in this case the most intensive alternative beam will always be added to the new active list, regardless of its intensity.

After step 810, the process continues at step 812. In step 812, the gateway determines whether additional alternate rays added to the new set of active rays. The number of alternative-rays added to the new set of active rays is determined by the level of required satellites explode. For example, if you have a configuration with passing only the two satellites, then the gateway will try to add only one alternative beam in a new set of active rays. However, if you choose the configuration with the division of N satellites, then the gateway will try to add in a new set of active rays N-1 alternative-rays.

DPSG such OPS. For example, the first four steps of the procedure 900 is similar to the first four steps in the procedure 800. The difference between the procedure 800 and procedure 900 is that the procedure 900 step 902 is executed in case ISIL minus ICIAL greater than or equal T_1, while in the procedure 800, if ISIL minus ICIAL greater than or equal T_1, the procedure ends.

In step 902, the gateway chooses the intensive alternative beam in the current active set, if one exists. The current active set refers to the set of active rays, in which the active beam is a beam that is already established line of communication between the gateway and the user terminal. Alternative beam in the current active set is the beam current alternate set of emitted not by satellite, which emits a beam located in the new set of active rays. To determine the most intensive alternative beam in the current active set, the gateway first selects a subset of values from FIAC, where a subset of values includes all values in the set FIAC, which correspond to the beam in the current active is set, emitted by the satellite, other than the satellite(s) (s) emit(s) light(s), located in the new set of active rays. Then, the gateway selects the maximum value from the subset. Following this, the gateway determines the beam, which corresponds to the value selected in the previous step.

If step 902 was successful, then at step 904; otherwise, the process ends. In step 904, the gateway determines, less than or equal to the second threshold (T) the difference between the intensity of the most intense beam (ISIL), FIAC and intensity of the most intense alternative satellite beam in the current active set (ISI-ASLTA). If this difference is less than or equal T, the most intensive alternative beam in the current active set is added to the new active set (step 906); otherwise, the process ends.

After step 906, the process continues to step 908. In step 908, the gateway determines whether to be added to the new set of active rays additional alternate rays. The number of alternative-rays added to the new set of active rays is determined by the level of required satellites explode. For example, if you have a configuration with distributed only for two satellites, then the gateway will try to add only one alternative beam in a new set of active rays. However, e is whether you want the configuration with the division of N satellites, then the gateway will try to add in a new set of active rays N-1 alternative-rays.

Preferably, T was more T_1, and T was equal to 6 dB when T_1 is 4 dB. However, you can use other values for these thresholds. When T more T_1, gateway prefers rays in the current set of active rays, thus reducing the number of switching of the communication channels due to temporary fluctuations in signal intensity in the beam, caused, among other reasons, the mirror reflection. Thresholds T_1 and T are selected, in particular, on the basis of known orbital distances to the satellites (the height above the earth's surface) and velocity, which together determine the angles and the frequency of the change of mirror reflection.

The advantage of the coding scheme (CPRS) is the simplicity of its implementation compared with the two-threshold circuit with hysteresis (DPSG). However DPSG has lower switching frequency communication channels than the OPS. Lower the switching frequency of the communication channels is achieved in DPSG due to the smoothing effect of "jitter"caused by intensity fluctuations of the signal in the beam due to specular reflections. Shaking effect occurs when the gateway alternately adds and removes a particular beam for a short time interval. At the completion of either process 800, process 900, a new set is active rays will contain rays, which should be used as the communication line connecting the gateway to a user terminal.

After step 512 executes step 514. In step 514, the gateway determines is equivalent to whether the new set of active rays to the current set of active rays. The current set of active rays consists of all rays that are already established line of communication between the gateway and the user terminal. If the new set of active rays is similar to the current set of active rays, the gateway does not initiate switching of communication channels, providing the user terminal with the opportunity to continue the use of rays in the current set of active rays (step 515). If the new set of active rays is not the same as the current set of active rays, the gateway will initiate the switching of the communication channels from one beam to the other (steps 516-530).

In a preferred embodiment, the switching of the communication channels from one beam to another is flexible (programmable) switching of communication channels from one beam to another. That is, the gateway does not break the connection in the current set of active rays until you receive confirmation from the user terminal that successfully receives information by the beam(s) in the new set of active rays. Therefore, as in the first step of initiation flexible switching of communication channels from one beam to another, the gateway starts sending graphy is and rays in the new set of active rays, not included in the current set of active rays, if the rays are present (step 516). In the next step, the gateway sends a message about the direction of switching of the communication channels (CQI) to the user terminal (step 518). In one embodiment, the CQI may contain two sets of identifiers rays, a set of added-rays and a set of excluded rays. Set added rays contains the identifier for each beam in the new set of active rays, which is not in the current set of active rays. It is possible that the set of added-rays will be empty, and in this case, CQI will contain only the set of excluded rays. The set of excluded rays contains the identifier for each beam in the current active set of rays, which is not in the new set of active rays. As in the case with a set of added-rays, it is possible that the set of excluded rays will be empty and in this case, CQI will contain only the set of added light. In the second embodiment, CQI contains the identifier corresponding to each beam in the new set of active rays. When receiving a CQI according to the second variant embodiment of the invention, the user terminal may determine a set of added-rays and a set of excluded rays, since the user terminal has information about what the rays are in the current active set.

Either in the first or second VA is iante user terminal when receiving a CQI schedule begins to take on the rays, identified in the set of added-rays (step 520). As soon as the user terminal starts receiving information on the rays identified in the set of added-rays, it will stop receiving information on the rays identified in the set of excluded rays (step 522). Then, the user terminal transmits a completion message to the switching of the communication channels from one beam to another (SSPC) to the gateway (step 524). Taking SSPC from the user terminal, the gateway terminates the transmission schedule rays identified in the set of excluded rays (step 526). Thus, it is flexible switching of communication channels from one beam to another.

The example message flow between the gateway and the user terminal is shown in figure 10. As shown in figure 10, the process of switching channels of communication begins with the fact that the gateway periodically (e.g. every 60 seconds) sends to the user terminal LSU/UNC. Taking magnesium, the user terminal periodically (e.g. every 10 seconds) sends to the gateway a message FIAC. Accepting from the user terminal a message FIAC, the gateway determines the most appropriate rays (i.e. defines a new set of active rays). If the new set of active rays coincides with the current set of active rays, then the gateway will not initiate switching of communication channels from one beam to another. But if the new set and the positive rays is different from the current set of active rays, the gateway will send to the user terminal, the CQI message. The user terminal will respond to this message SSPC.

As shown in figure 10, the user terminal typically sends a message FIAC only after expired predefined time interval after sending the previous FIAC. But there is at least one situation where the user terminal is recommended to send to the gateway "unscheduled" message FIAC. Unscheduled FIAC is FIAC, which is sent to the gateway whenever there blocking the satellite, regardless of when it was sent the previous message FIAC. Blocking of the satellite is defined as a condition in which the current intensity of the active beam is less than the intensity of active ray in the last transmitted message FIAC minus the value thresholds (_Loss) and remains within a specified time interval (T_Tloss). When this situation occurs, the user terminal will perform the steps 506-510, passing thereby unplanned FIAC. Suppose for example that the current intensity of the active beam is 7 or less on the interval T_Tloss and that the intensity of the active beam, reported in the previous FIAC is 10. If 7 < (10-_Loss), then the user terminal will send an unplanned FIAC. Then the gateway will perform step 512, as is shown above. That is, the gateway uses the FIAC to determine which beam(s) should be used to transfer graphics to the user terminal.

IV. Description transceiver for user terminal

An example of a transceiver 1100 for use in the terminal 124 of the user is shown figure 11. These transceivers are known to experts in the art and described, for example, in U.S. patent No. 5109390 "Receiver with diversity in a cellular telephone system IDCR". In the transceiver 1100 is used at least one antenna 1110 for receiving communication signals that are transmitted to the analog receiver 1114, where they are converted with decreasing frequency, amplified and digitized. In order to use the same antenna for both transmission and reception, usually applied duplexer 1112. However, some systems use separate antennas for transmit and receive on different frequencies.

Digital communication signals issued by the analog receiver 1114, transmitted by at least one receiver A digital data and preferably at least one search receiver 1118. To ensure the required levels explode signals or reception of multiple signals depending on the acceptable level of complexity of the transceiver 1100 can be used to augment the performance communications receivers V-1116N digital data, as is obvious to experts in the field of technology. For more sophisticated search methods signals can be used additional search receivers.

The receivers 1116A-1116N digital data and the search receiver 1118 is connected at least one block 1120 control terminal of the user. Block 1120 management, among other functions, provides the basic signal processing, synchronization, control, or coordinate the switching of the communication channels from one beam to another and the choice of frequencies used for the signal bearing. Another basic function of management, often performed by block 1120 management is the selection or manipulation of PN code sequences or orthogonal functions, which are used for processing forms of communication signals. The signal processing unit 1120 management may include determining the relative intensity of the signals and calculate various relevant parameters of the signals. The above calculations of parameters of signals, such as synchronization parameters and frequency, may include the use of additional or dedicated circuits to provide increased efficiency or speed measurement or a more efficient allocation of resources for processing the control data. For example, an item measuring intensive the motion signal, can be connected to the analog receiver to use existing information available to determine the intensity or signal strength for a received analog signal in General. This measuring element can also be connected to receive output signals (or data available from) receivers, digital data and search receivers to measure the energy or power in certain accept or demodulating signals.

The outputs of receivers 1116A-1116N digital data is connected to the circuit 1122 to digital baseband, in the user terminal. Custom scheme 1122 for digital baseband includes elements for processing and presentation of data used for transmission of information to and from the user terminal. In other words, the elements for storing signals or data, such as memory for temporary storage or long-term memory; input and output such as display screens, speakers, keyboards, terminals and handsets; analog-to-digital elements, vocoders and other elements for processing speech and analog signals; etc. form part of the subscriber circuit to a digital baseband using known elements. If you are using signal processing with time what esteem, the custom scheme 1122 for digital baseband may include one or more combiners spaced signals and decoders. Some of these items may also be running block 1120 control or to be in touch with him.

When preparing a speech or other data as the output message or communication signal generated by the user terminal, the user circuit 1122 to the digital baseband is used for receiving, storing, processing and other skills required for data transmission. Custom scheme 1122 for digital baseband submits these data to the modulator 1126 transmission running block 1120 management. The output signal of the modulator 1126 transmission is transmitted to the controller 1128 power, which allows control of the output power amplifier 1130 transmit power for the final transfer of the output signal from the antenna 1110 on the gateway or base station.

In the terminal 1100 user can also use the element 1132 pre-correction in the transmission path to adjust the frequency of the outgoing signal. This can be accomplished using known methods of transformation with increasing or decreasing frequency signal transmission. In the terminal 1100 user the La element 1132 pre-correction can also be used in the transmission path to adjust the timing of the outgoing signal. This can be accomplished using well-known methods of adding or subtracting a delay in signal transmission.

Information or data corresponding to one or more measured signal parameters for the received communication signals or one or more signals that share the system resources may be sent to the gateway using a variety of different ways known in the art. For example, information can be transmitted in a separate information signal is either added to the end of the other messages, custom circuit 1122 to digital baseband. Alternatively, this information can be entered in the form of predefined control bit modulator 1126 transfer or controller 1128 transmit power-controlled block 1120 management using known methods.

In the configuration of the digital receivers 1116A-N and search receiver 1118 includes the elements of the correlation signals for demodulation or monitor certain signals. Search receiver 1118 is used to search for pilot signals or other related intense signals with a fixed configuration. The pilot channel signal is just one signal that is not modulated by data, and can use the VAT input signal with a constant value (configuration) or input tone type, effectively transmits only PSH extend codes. Digital receivers A-N are used for demodulation of other signals associated with the detected pilot signals. However, in order to determine the intensity of the signal to the data sink may be prescribed to treat the pilot signal after it is detected to determine the exact relationship of the energies of the code element signal-to-noise. In the General case, the energy code elements of the pilot signal is integrated at predetermined intervals, such as periods of characters, to determine the intensity of the pilot signal. Therefore, the output signals of the receivers 1116A-N can be continuously monitored to determine the energy or frequency of the pilot signal or other signals. In these receivers are also used elements of the monitoring frequency continuous monitoring which can provide information about the current frequency and the synchronization settings for the unit or processor 1120 management for demodulating signals.

As was established above, the block 1120 management among other features, provides control of the switching of the communication channels from one beam to another. That is, the control unit 1120 receives, for example, messages SSL gateway, measures the intensity of the rays through the continuous monitoring of the energy of the pilot signal and transmits messages FIAC on the gateway. When the EP block 1120 control shown in Fig. Block 1120 includes one or more processors, such as processor 1204. The processor 1204 is connected to the communication bus 1202.

Block 1120 management can be implemented in software controlled processor programmed to perform the required according to the invention functions, i.e. implemented as a known standard elements or hardware of a General purpose, involving many different digital signal processors, programmable electronic devices or computers that are running specialized software or hardware programmed to perform the required functions.

Block 1120 management also includes main memory 1206, preferably random access memory (RAM) random access, and may also include additional memory 1208. Additional memory 1208 may include, for example, a tool that enables you to download computer programs, or other commands in block 1120 management. Such means may include, for example, the storage device 1222 and interface 1220. Examples of such devices may be memory chips (such as EPROM or EPROM) with the corresponding socket or other storage device 1222 and interfaces 1220, which allow you to send ol the programs and data from a storage device 1222 in block 1120 control.

Block 1120 management may also include the interface 1224 connection. Interface 1224 communication network transfer programs and data between, for example, block 1120 control and receiver 1116 digital data.

In the present description, the terms "media computer software" and "used by computer media" are used in General to determine such a drive as a removable storage device 1222 and the main memory 1206. These products are for computer programs are a means of ensuring the unit 1120 management software.

Control or computer programs (also called computer control logic) are stored in main memory and/or secondary memory 1208. The execution of these computer programs allows you to block 1120 management to implement features of the present invention discussed above. In particular, for example, these computer programs when they are executed enable the processor 1204 to perform a comparison of measured values of the intensity of the rays. Thus, such computer programs represent controllers of block 1120 control.

In another embodiment, block 1120 control is implemented mainly in the form of dedicated hardware, for performing the specified functions, using, for example, such hardware is components, as application-specific integrated circuits (ASIC), or one or more nodes of the circuit boards. Specialists in the art it is obvious how you can implement a state machine based on the hardware to perform the functions described here.

In another embodiment, block 1120 control is implemented using a combination of hardware and software.

V.

On Fig shows the components of the gateway 120, allowing the gateway to implement features of the present invention. As shown in figure 3, the gateway 120 includes a subsystem 1301 switching gateway (PCS)connected to the public switched telephone network 1390 General use (PSTN), a subsystem 1302, consisting of a set of selectors (PNS), block 1318 time and frequency (BWC), the controller 1320 gateway (CABG), subsystem 1322 interconnects mdcr (PMM)system 1304 transfer gateway (SPS) and radio frequency subsystem 1310 gateway (RPS). SPS includes the transmission system in a straight line (SPLS) 1306 and the transmission system through a return line connection (SPAS) 1308. SPLS 1306 receives packet data from the TNC 1302, modulates and converts the frequency of these data to an intermediate frequency FC (800-1000 MHz) and sends them to the RF subsystem (RPS) 1310, which delivers them to the antenna 1312, for transmission to the satellite. Then the satellite transmits this signal to the user terminal. Packet data received in PPLS 1306 from PNS 1302, include graphics frames, frames, service messages and information for power control. Footage of the graph can contain messages LSU, UNC, and CQI. Thus, the gateway transmits messages LSU, UNC, and this contributes to the user's terminal.

SPOOLS 1308 receives the if signals from BS 1310, converts them with decreasing frequency and demodulates, and then sends the packet data in the PNS 1302 for further processing. Packet data received in the PNS 1302 include: frames, graphics frames and service messages transmitted from the user terminal. Message FIAC and SSPC transmitted from the user terminal to the gateway in the frame traffic. Thus messages FIAC and SSPC accepted on the gateway.

PNS 1302 includes one or more selectors 1314 for handling voice calls and perform actions necessary to implement the switching of the communication channels from one beam to another. For example, the selectors 1314 analyze messages FIAC sent from the user terminal to determine what new rays (if they exist) should be added, and which (if they exist) should be excluded. Before adding rays PNS 1302 sends a request to the CS 1320 to provide resource a straight line. If the resource request is received, the selector 1314 gives the signal in SPLS 1306 at the beginning of the transmission of the direct graphics on the new beam. As soon as SPLS 106 starts the transmission schedule, the selector 1314 sends the CQI message to the user terminal. Taking the graph on the new beam, the user terminal sends to the selector 1314 message SSPC. After taking SSPC the selector 1314 outputs a signal in SPLS 1306 to terminate the transmission schedule for the excluded beam, if it exists.

As block 1120 control, the selector 1314 may be implemented as a program-controlled processor programmed to perform the functions described here, i.e. implemented as a known standard elements or hardware of a General purpose, including many different digital signal processors, programmable electronic devices or computers that are running specialized software, or hardware and software programmed to perform the required functions.

An example of the selector 1314 shown in Fig. The selector 1314 includes one or more processors, such as processor 1404. The processor 1404 is connected to the communication bus 1402. The selector 1314 also includes a main memory 1406, preferably a random-access memory (RAM), and may also include secondary memory 1408. The secondary memory may include, for example, a tool that allows you to download in the selector 1314 computer programs or other commands. This tool is activated, for example, a field replaceable unit 1422 memory and interface 1420. As examples there can be used a removable memory chip (such as an EPROM, or PROM) with the corresponding socket, hard disks, magnetic tape, CD-ROM, and other similar optical storage devices and other removable blocks 1422 memory and interfaces 1420, which enable forwarding of programs and data from the plug-in unit 1422 memory selector 1314. The selector 1314 may also include interface 1424 connection. Interface 1424 connection allows you to send data between the selector 1314 and, for example, SPLS.

Computer programs (also called computer control logic) are stored in main memory and/or secondary memory 1408. These computer program when executed enable the selector 1314 implement features of the present invention. In particular, for example, computer programs when they are executed enable the processor 1404 to perform a comparison of measured values of the intensity of the rays. Thus, such computer programs represent controllers of the selector 1314.

In another embodiment, the selector 1314 is implemented primarily in hardware, configured to perform the specified function, using, for example, such hardware components such as application-specific integrated micro is Hemi (ASIC), or one or more nodes of the circuit boards. Specialists in the art it is obvious how you can implement a state machine based on the hardware to perform the functions described here.

In another embodiment, the selector 1314 is implemented using a combination of hardware and software.

VI. Conclusion

The above description of the preferred options is designed to allow professionals in the art to implement or use the present invention. Although the invention is shown in detail and described with references to preferred options for its implementation, specialists in the art it is obvious that they can be made various changes in form and detail, without going beyond the nature and scope of the invention.

1. The way to reduce the frequency of drop calls in multibeam communication system that has a user terminal, the communication station and the source of the rays, radiating a multitude of rays, and in which the communication line between the user terminal and the communication station is installed at least one of the multiple beams, and the method includes (1) receiving at the user terminal multiple IDs rays transmitted from the communication station, (2) measurement of the user terminal intensity of each beam, identified by many of the IDA is tification rays, (3) the transfer from the user terminal to the communication station sets the intensity of the beams, each of a set of values of the intensity of the rays is a function of the measured intensity of the beam, identified one of the multiple identifiers rays, and (4) reception at the user terminal messages about the direction of switching of communication channels transmitted by the communication station, and (a) based on the message about the direction of switching of the communication channels, the user terminal determines which beam or beams should be used for receiving the information transmitted from the communication station, (b) a message about the direction of switching of the communication channels includes the identifier of the beam corresponding to each beam in the new set of active rays, and (C) a new set of active beams include beams selected by the communication station to be used as the communication line between the communication station and the user terminal.

2. The method according to claim 1, characterized in that when receiving a message about the direction of switching of the communication channels the user terminal starts receiving the schedule for each beam in the new set of active rays, which is not in the current set of active rays, the current set of active rays includes all rays, which has already established line of communication between the communication station and the user terminal.

3. The way is about 2, characterized in that it further includes a message about the completion of the switching of the communication channels from the user terminal to the communication station after the terminal user will receive the schedule for each beam in the new set of active rays, which is not in the current set of active rays.

4. The way to reduce the frequency of drop calls in multibeam communication system that has a user terminal, the communication station and the source of the rays, radiating a multitude of rays, and in which the communication line between the user terminal and the communication station is installed at least one of the multiple beams, and the method includes (1) receiving at the user terminal multiple IDs rays transmitted from the communication station, (2) measurement of the user terminal intensity of each beam, identified by many IDs rays, (3) transmission from a user terminal to the communication station sets the intensity of the beams, with each of multiple values of the intensity of the rays is a function of the measured intensity of the beam, identified one of the multiple identifiers rays, and (4) reception at the user terminal messages about the direction of switching of communication channels transmitted by the communication station, and (a) on the basis of reports of the direction switching Kahn is a catch connection, the user terminal determines which beam or beams should be used for receiving the information transmitted from the communication station, (b) a message about the direction of switching of the communication channels includes the identifier of the beam corresponding to each beam in the new set of active rays, which is not in the current set of active rays, (c) the current set of active rays includes all rays, which has already established line of communication between the communication station and the user terminal, and (d) a new set of active beams include beams selected by the communication station to be used as the communication line between the communication station and the user terminal.

5. The method according to claim 4, characterized in that when receiving a message about the direction of switching of the communication channels the user terminal begins to take on a graph by the beam, identified by the identifier of the beam in the message about the direction of switching of the communication channels.

6. The method according to claim 5, characterized in that it further includes a message about the completion of the switching of the communication channels from the user terminal to the communication station.

7. The way to reduce the frequency of drop calls in multibeam communication system that has a user terminal, the communication station and the source of the rays, radiating a multitude of rays, and in which the communication line between the user terminal and the communication station is set by Myung is our least one of the multiple beams, moreover, the method includes (1) receiving at the user terminal multiple IDs rays transmitted from the communication station, (2) measurement of the user terminal intensity of each beam, identified by many IDs rays, (3) transmission from a user terminal to the communication station sets the intensity of the beams, each of a set of values of the intensity of the rays is a function of the measured intensity of the beam, identified one of the multiple identifiers rays, and (4) reception at the user terminal messages about the direction of switching of communication channels transmitted by the communication station based on the message about the direction of switching of the communication channels the user terminal determines which beam or beams should be used for receiving the information transmitted from the communication station, with (a) information about the direction of switching of the communication channels includes the identifier of the beam corresponding to each beam in the current active set of rays, which is not in the new set of active rays, (b) the new set of active beams include beams selected by the communication station to be used as the communication line between the communication station and the user terminal, and (c) the current set of active rays includes all rays, which has already established line of communication between stansiyasi and terminal user.

8. The method according to claim 7, characterized in that after receiving the message about the direction of switching of the communication channels the user terminal stops receiving the schedule by the beam, identified by the identifier of the beam in the message about the direction of switching of the communication channels.

9. The way to reduce the frequency of drop calls in multibeam communication system that includes a user terminal, the communication station and the many sources of rays, each of which emits multiple beams, and in which the communication line between the user terminal and the communication station is installed on one or more beams, and the method includes (1) transmission from the communication station to the user terminal multiple IDs rays, and many identifiers rays identifies multiple beams and multiple sources of rays used in the present station communication, (2) receiving at the communication station sets the intensity of the rays transmitted by the user terminal, where each of the multiple values of the intensity of the rays is a function of the measured intensity of the beam, identified one of the multiple identifiers rays, (3) determination stations new set of active rays on the basis of a set of values of the intensity of the rays, where the new set of active rays includes one or more beams, the cat is who should be used as the communication line between the communication station and the user terminal, includes (a) selecting a first beam having the highest intensity on the basis of a set of intensity values rays, and referred to the first beam emitted by the first source of rays, (b) the inclusion of the first ray in the new set of active rays, (c) selecting a first subset of values of the intensity of the beams of a set of values of the intensity of the rays, and the first subset of values of the intensity of the beams includes each value of a set of values of the intensity of the rays, which corresponds to the beam emitted by the beam source, different from the first source beam, (d) selecting a second beam having the greatest intensity, based on the first subset intensity values rays and (e) the inclusion of the second beam in a new set of active rays, if the intensity of the first beam minus the intensity of the second beam is less than or equal to the first threshold value, where the first threshold is greater than or equal to zero, and (4) the transfer schedule from the communication station to the user terminal by the rays in the new set of active rays.

10. The method according to claim 9, characterized in that the determination on the communication station a new set of active rays further includes (6) selecting the second subset of values of the intensity of the rays from the first subset, and each value of the beam intensity in the second subset of values of the intensity of the rays line is only active beam, active beam is a beam, which currently transmitted information between the user terminal and the communication station, (7) selecting a third beam having the greatest intensity, based on the second subset of intensity values rays and (8) the inclusion of the third beam in the new set of active rays, if the intensity of the first beam minus the intensity of the third beam is less than or equal to the second threshold value.

11. The method according to claim 10, characterized in that the second threshold value is greater than or equal to the first threshold value.

12. The system in the user terminal to reduce the frequency of drop calls in multibeam communication system having a user terminal, the communication station and the source of the rays, in which each source rays emits multiple beams and in which the communication line between the user terminal and the communication station is installed at least one beam, the system includes a tool receiving identifiers rays for taking multiple IDs rays transmitted from the communication station, and identifiers rays identify many rays, currently used by the communication station, a means of measuring the intensity of the rays to measure the intensity of each beam, identified by many IDs rays, means for transferring DL the transmission to the communication station sets the intensity of the rays, each of a set of values of the intensity of the rays is a function of the measured intensity of the beam, identified one of the multiple identifiers rays, a means of receiving messages about the direction of switching of communication channels to receive messages about the direction of switching of communication channels transmitted by the communication station, and means for determining which beam or beams should be used for receiving the information transmitted from the communication station based on the message about the direction of switching of the communication channels, the message about the direction of switching of the communication channels includes the identifier of the beam corresponding to each beam in the current active set of rays, which is not in the new set of active rays, a new set of active beams include beams selected by the communication station to be used as the communication line between the communication station and the user terminal, and the current set of active rays includes all rays, which has already established line of communication between the communication station and the user terminal.

13. The system of item 12, wherein after receiving the message about the direction of switching of the communication channels the user terminal stops receiving the schedule by the beam, identified by the identifier of the beam in the message about the direction of switching of the communication channels.

14. System terminal user to reduce the frequency of drop calls in multibeam communication system, having a user terminal, the communication station and the source of the rays, in which each source rays emits multiple beams and in which the communication line between the user terminal and the communication station is installed at least one beam, and the system includes means for receiving multiple IDs rays transmitted from the communication station, and identifiers rays identify many rays, currently used by the communication station, means for measuring the intensity of each beam, identified by many IDs rays, the transmission medium for transmission to the communication station sets the intensity of the beams, each of a set of values of the intensity of the rays is a function of the measured the intensity of the beam, identified one of the multiple identifiers rays, means for receiving setting values of the intensity of the rays transmitted by the communication station, and the configuration tool to configure the set of values of the intensity of the rays in accordance with the setting values of the intensity of the beams, with the configuration tool configures the set of values of the intensity of the rays in accordance with the setting values of the intensity of the rays before the transmission medium will begin to pass the multiple values of the intensity of the rays in the article is nciu communication in the result, the link station will accept the configured values of the intensity of the rays.

15. System stations to reduce the frequency of drop calls in multibeam communication system having a user terminal, the communication station and the many sources of the rays, in which each source rays emits multiple beams and in which the communication line between the user terminal and the communication station is installed on one or more rays, and the system includes means for identifying a set of rays used in the present station communication means for transmission to the user terminal multiple IDs beams, with each beam ID identifies one of the beams used in the present station communication means for receiving multiple values the intensity of the rays transmitted by the user terminal, and each of a set of values of the intensity of the rays is a function of the measured intensity of the beam, identified one of the multiple identifiers rays, means for determining a new set of active rays on the basis of a set of intensity values rays, and a new set of active rays includes one or more beams that should be used as the communication line between the communication station and the user terminal is El, includes means for selecting the first beam, with the largest intensity, based on a set of values of the intensity of the beams, the first beam emitted by the first source of rays, means for enabling the first ray in the new set of active rays, means for selecting the first subset of values of the intensity of the beams of a set of values of the intensity of the rays, and the first subset of values of the intensity of the beams includes each value of a set of values of the intensity of the rays, which corresponds to the beam emitted by the beam source, different from the first source beam, means for selecting the second beam, with the largest intensity, based on the first subset the intensity of the beams, and means for enabling the second beam in a new set of active rays, if the intensity of the first beam minus the intensity of the second beam is less than or equal to the threshold value that is greater than or equal to zero, and means for transmitting the schedule to the user terminal by the rays in the new set of active rays.

16. The system of clause 15, wherein the means for determining a new set of active rays additionally includes means for selecting the second subset of values of the intensity of the rays from the first subset, and each value of the beam intensity in the second podnao the e values of the intensity of rays corresponds to the active beam, active beam is a beam, which currently transmitted information between the user terminal and the communication station, means for selecting a third beam having the greatest intensity, based on the second subset of values of the intensity of the rays and the means for enabling the third beam in the new set of active rays, and means for enabling the third beam in the new set of active rays includes a third beam in the new set of active rays, if the intensity of the first beam minus the intensity of the third beam is less than or equal to the second threshold value.

17. The system of clause 16, wherein the second threshold value is greater than or equal to the first threshold value.

18. System to reduce the frequency of drop calls in multibeam communication system having a user terminal, the communication station and the many sources of the rays, in which each source rays emits multiple beams and in which the communication line between the user terminal and the communication station is installed on one or more beams, the system includes computer program logic stored on the computer storage media, and the logic of the computer program includes a feature that allows stations to identify the set of rays used in the present mill what their connection, tool that allows stations to transmit to the user terminal the set of identifiers of beams, with each beam ID identifies one of the beams used in the present station communication tool, allowing the stations to accept a set of values of the intensity of the rays transmitted from the user terminal, and each of a set of values of the intensity of the rays is a function of the measured intensity of the beam, identified one of the multiple identifiers rays, a tool that enables stations to determine the set of values of the intensity of the rays of a new set of active rays, and a new set of active rays includes one or more beams that should be used as the communication line between the communication station and the user terminal, includes a feature that allows stations to choose the first beam, with the largest intensity, based on a set of values of the intensity of the beams, the first beam emitted by the first source of rays, a tool that enables stations to enable the first beam in the new set of active rays, a tool that enables stations to select the first subset of values of the intensity of the beams of a set of values of the intensity of the rays, and the first subset of values of the intensity of the rays in the cancel each set of values of the intensity of the rays, which correspond to the beam emitted by the source of the rays, different from the first source of rays, a tool that enables stations to select the second beam, with the largest intensity, based on the first subset of values of the intensity of the rays and the means of enabling the communication station to include a second beam in a new set of active rays, and the communication station comprises a second beam in a new set of active rays, if the intensity of the first beam minus the intensity of the second beam is less than or equal to the first threshold value that is greater than or equal to zero, and the means of enabling the communication station to transmit the schedule to the user terminal by the rays in the new set of active the rays.

19. System p, characterized in that the means enabling the communication station to determine the set of values of the intensity of the rays of a new set of active rays, additionally includes a tool that enables communication station to select a second subset of values of the intensity of the rays from the first subset, and each value of the intensity of the rays in the second subset of values of the intensity of rays corresponds to the active beam, the active beam is a beam, which currently transmitted information between the user terminal and the communication station, a tool that enables stations to choose third beam having himself the Yu high intensity, based on the second subset of values of the intensity of the rays, and the way in which the stations include the third beam in the new set of active rays, and the communication station includes a third beam in the new set of active rays, if the intensity of the first beam minus the intensity of the third beam is less than or equal to the second threshold value.

20. The system according to claim 19, characterized in that the second threshold value is greater than or equal to the first threshold value.



 

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FIELD: communications engineering.

SUBSTANCE: proposed system has user terminal, gateway, and plurality of beam sources radiating plurality of beams, communication line between user terminal and gateway being set for one or more beams. Proposed method is based on protocol of message exchange between gateway and user. Depending on messages sent from user to gateway, preferably on pre-chosen periodic basis, gateway determines most suited beam or beams to be transferred to user. Messages sent from user to gateway incorporate values which are, essentially, beam intensities measured at user's. Gateway uses beam intensities measured at user's to choose those of them suited to given user. Beams to be used are those capable of reducing rate of call failure and ensuring desired separation level of beam sources.

EFFECT: reduced rate of call failure in multibeam communication system.

20 cl, 27 dwg

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