• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
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    • 专利摘要:
    A soft access station site diversity switching method between a first relay satellite access station of a space telecommunications system and a second redundant access station to the same satellite comprises a preparation phase ( 104) of soft switching, and an execution phase (106) of smooth switching, executed successively. During the execution phase (106), a first traffic switching at the ground segment to the second redundant access station, and a second switching at the satellite edge segment between a first nominal access link of the first nominal access station and a second redundant access link of the second redundant access station are finely synchronized.
    公开号:FR3051618A1
    申请号:FR1600809
    申请日:2016-05-20
    公开日:2017-11-24
    发明作者:Cedric Baudoin；Erwan Corbel；Pierre Tayrac
    申请人:Thales SA；
    IPC主号:
    专利说明:

    Soft switching method with diversity of access station sites implemented in a space telecommunications system
    The present invention relates to a method of soft switching (in English soft hand over) to diversity of access stations to switch a telecommunications data traffic from a first nominal access station (in English "nominal gateway") to a satellite relay from a space telecommunication system to a second redundant gatway station at the same satellite, when a first access link of the first access station undergoes or will undergo an attenuation which not allow the first access station to ensure proper transmission of traffic to the satellite. The invention also relates to a space telecommunications system, configured for implementing the method of soft switching of a telecommunications traffic between the first nominal access station and the second redundant access station.
    The technical field in which the invention is applied is that of space telecommunications systems, and more particularly those using the high frequency bands included in the Q / V and W bands, due to the capacity increase resulting from a such use. Band V is defined as the radiofrequency band between 47.2 and 51.4 GHz while band Q is defined as the band of radio frequencies between 37.5 and 42.5 GHz. These frequency bands are characterized by very high attenuation levels, caused by cloud obstruction and of the order of 20 to 30 dB, for example for the Q / V bands depending on the availability of the transmission considered. Such attenuation levels can not be supported by conventional means alone, i.e. those using power control and / or adaptive modulation / coding. Therefore, for space telecommunication systems operating in these high bands, site diversity solutions with gateway failover are implemented to ensure the availability of the system.
    In known manner, there are three types of solutions for performing a switchover of traffic from one access station to another: .- a first type of failover, called unsynchronized hand-over ("unsynchronized handover"), a switchover of the second type, called "break before make-over", and .- a switch of the third type, called in English "make before break hand-over".
    Non-synchronized solutions of the first type are those that are conventionally implemented during maintenance operations where a backup access station (in English "backup gateway") will take the role of an active nominal access station. , the time of its maintenance. This operation is not finely synchronized between the edge and the ground, ie between the satellite and the terrestrial component of the space telecommunications system, and leads to the disconnection of all terminals, users of the telecommunication service, with a very important impact on the service.
    The second type of solutions, that is to say those called "break before make" are to stop the current access link on the first nominal access station, then to switch board, that is to say at the satellite level, between two satellite access links, before activating the second redundant access station. This type of solution has the advantage of being simple to implement but involves a major service interruption since the operations of this type of switchover are successively in series.
    The third type of solutions, that is to say those known as "make before break" consist of starting the service on the second redundant access station as quickly as possible before the edge switching of the access links. This type of solution involves significant loss of data packets in the first nominal access station, precisely the packets that are in the buffers at the time of edge switching, as well as losses on the new access link due to the loss of synchronization of the satellite system user terminals after board switching and the recovery time of a new synchronization for each of the terminals.
    The technical problem solved by the invention is to propose a method of soft switching of data traffic between a first nominal satellite access station and a second satellite redundant station of a space telecommunications system which minimizes the impact on the service. by reducing the break times of the satellite access station link and / or by avoiding fine synchronization between the first access access station and the second redundant access station, thereby reducing data loss in the access stations. buffers of said stations and the added latency introduced, and / or decreasing the time required for the resynchronization of terminals while minimizing the loss of data that could be induced by the user terminals. To this end, the subject of the invention is a method for soft switching to diversity of access station sites for switching a telecommunication data traffic between a first nominal access station to a relay satellite of a telecommunications system. to a second redundant access station on the same satellite when a first access link of the first access rated station is or will be attenuated which does not allow the first access rated station to provide correct transmission of traffic to the satellite. The failover method is characterized in that it comprises a failover preparation phase and a failover execution phase, which is then executed, in which a first traffic switching at the ground segment between the first access rated station and the second redundant access station, and a second satellite edge segment switching between the first access link and a second redundant access link of the second redundant satellite access station are finely synchronized between they.
    According to particular embodiments, the method of soft switching to diversity of access station sites comprises one or more of the following characteristics: the first switching of the traffic at the ground segment between the first station of the access station; access and the second redundant access station is executed before the second switching at the satellite edge segment between the first access link and the second redundant access link are synchronized, and from the first switch to the ground segment of the data traffic to the second redundant access station, the first access rated station and the second redundant access station are simultaneously active, and both remain active until the beginning of the second redundant access station. level of the edge segment to the second redundant access link, where only the first nominal station of ac this is then disabled; the first ground segment traffic switching between the first access rated station and the second redundant access station is executed before the second switching at the satellite edge segment between the first access link and the second redundant access links are synchronized, and from the first switch at the ground segment of the data traffic to the second redundant access station, the second redundant access station buffers the incoming data traffic switched to the ground level by a sufficient number of empty frames to allow satellite terminals of the space telecommunications system to resynchronize as quickly as possible; in parallel with the first access destination station empty a buffer memory containing the traffic data not yet transmitted at the time of the beginning of the first ground-level traffic switching between the first and second access stations; the preparation phase comprises a step of configuring the second redundant access station with the configuration of the first access first station; the preparation phase comprises a step of sending a satellite remote control TC to the satellite to modify the entire satellite edge switch matrix at a specified switching date; the preparation phase comprises a step of sending a satellite remote control TC to the satellite to modify the entire satellite edge switching matrix at a specified switching date, followed by a step of configuring the second station redundant access with the configuration of the first of the first access rated station; the method of soft switching with diversity of access stations defined above comprises a step of decision making of the realization of a soft switch to diversity of access stations from a forecast of the events of unavailability of the first nominal access link provided by the first nominal access station from a weather forecast model or an estimator of the channel supported by the first access access link, the second redundant access station; access on which the switch will take place, the date and duration of the switchover being identified in the switch decision. The invention also relates to a space telecommunications system for smoothly switching telecommunication data traffic between a first nominal access station to a satellite relay space telecommunications to a second redundant access station to the same satellite when a first access link of the first access rated station undergoing or being attenuated which does not allow the first access rated station to ensure a correct transmission of the traffic to the satellite. The space telecommunications system includes: the telecommunications relay satellite, and the first access rated access station and the second redundant access station, and a high-speed access station interconnection ground network infrastructure, and the data traffic at a predetermined network entry point, and a plurality of space terminals users of telecommunications services, and a coordination and control station of the space telecommunications system, and a TMTC reception station of telemetry TM and transmitting TC remote controls from and to the satellite. The space telecommunications system is characterized in that it is configured to implement a soft failover method comprising a failover preparation phase, a failover execution phase successively executed, a first traffic switching at the level of the ground segment from the first nominal access station to the second redundant access station, and second switching at the satellite edge segment between the first access access link and a second access redundant link of the second access station; redundant access being finely synchronized during the execution phase of soft failover.
    According to particular embodiments, the space telecommunications system comprises one or more of the following features: the first access rated station, the second redundant access station and the satellite are configured to synchronously execute the first switching traffic at the ground segment between the first access rated station and the second redundant access station prior to the second switching at the satellite edge segment between the first access access connection and the second access redundant access connection ; and the first access rated station and the second redundant access station are configured to be simultaneously active from the beginning of the first ground segment switching of the data traffic to the second redundant access station, to remain both active until the second switching at the edge segment to the second redundant access link, only the first access access station being disabled during and after the second switching at the edge segment of the satellite; the first access rated station, the second redundant access station and the satellite are configured to synchronously execute the first traffic switching at the ground segment between the first access rated station and the second redundant station prior to the second switching at the satellite edge segment between the first access link and the second access redundant link; and the second redundant access station is configured to, from the first switch at the ground segment of the data traffic to the second redundant access station, buffer the incoming data traffic switched at ground level by a sufficient number empty frames to be transmitted to enable the satellite terminals of the satellite telecommunications system to resynchronize as quickly as possible; the first nominal access station is configured to, from the beginning of the first ground-level traffic switching to the second redundant access station, empty at least one of its buffers containing the traffic data not yet transmitted to the second redundant access station; the moment at which the first ground-level traffic is switched between the first and second access stations; the coordination and control station of the space telecommunications system is configured to make a decision to perform a soft changeover to access station diversity on the basis of a forecast of the unavailability events of the first link nominal access rate of the first nominal access station, said forecast being determined from a weather forecast model or an estimate of the state of the channel supported by the first nominal access link, an identification of the second redundant access station on which the switchover will take place, the date and duration of the switchover being identified in said switchover decision, and to control and perform scheduling of the steps of the switchover preparation phase, said preparation phase comprising a step of sending a satellite remote control TC to the satellite to modify the appears from the satellite edge switching matrix at a specified switching date, and a step of configuring the second redundant access station with the configuration of the first access first station; synchronization between the first traffic switching at the ground segment to the second redundant station, and the second switching at the satellite edge segment between the first access link and the second redundant access link is prepared by the coordination and control station, through the sending by the coordination and control station to the first and second access stations of a time setpoint of the instant of tripping of the traffic switching at the ground segment and sending the TC remote control station from a satellite TC remote control to the satellite to modify the entire satellite edge switching matrix at a switching date specified by said coordination station and control. The invention will be better understood on reading the description of a single embodiment which will follow, given solely by way of example and with reference to the drawings in which: FIG. 1 is a view of a system space telecommunications configured to implement the method of soft traffic switching to diversity of access station sites according to the invention; Figure 2 is a flow chart of a method of soft switching of traffic to diversity of access station sites according to the invention; Figure 3 is a timing diagram of the actions performed in the context of the soft switching method according to the invention by the various elements of the spatial telecommunications system of Figure 1, involved in the implementation of the soft switching method.
    According to Figure 1, a space telecommunications system 2 is configured to softly switch telecommunication data traffic from a first nominal station 4, also referred to as GWn, of access to a space communication relay satellite 6, to a home network. second redundant station 8, also designated GWp, access to the same satellite 6, when a first access link 14 of the first access station 4 undergoes or will undergo attenuation that does not allow the first station rated access 4 to ensure proper transmission of traffic to the satellite 6.
    The space telecommunications system 2 comprises the relay communications satellite 6, the first access rated station 4 and the second redundant access station 8, and, if applicable, other access stations GW not shown in FIG. , and a high-speed ground infrastructure 18 for interconnecting access stations 4 GWn, 8 GWp, GW with each other in a network, the ground interconnection infrastructure 18 of the network access stations being connected to a ground network conventional telecommunications, not shown, through a bridge 20.
    The space telecommunications system 2 also comprises a plurality of space terminals 22, 24 telecommunications service users, also designated by ST, two user space terminals 22, 24 being only shown here.
    The space telecommunications system 2 also includes a coordination and control center 32 of the space telecommunications system, composed of a control center 34 NCC (in English Network Control Center) of the ground interconnection infrastructure 18 of the radio stations. access, and control center 36 SCC (English Satellite Control Center) satellite 6. Here in particular, the control center 34 NCC interconnection ground infrastructure 18 and the control center 36 SCC satellite 6 are located on the same geographical site.
    The space telecommunications system 2 also comprises a telemetry receiving station TMTC TMTC and transmitting TC remote controls, from and to the satellite 6. Here in FIG. 1 and in a particular way, the station TMTC is located on the same geographical location as that of the control center 36 SCC satellite 6. Alternatively, the two geographical sites may be different and far apart from each other.
    When the first access link 14 of the first satellite access station 4 is established, the first nominal station 4 is activated and transmits the traffic data on a main uplink 42 to the satellite 6 because of the activation of a satellite reception spot 44 by the satellite 6 by configuring the matrix of satellite covers in an appropriate manner.
    Here, the uplink 42 is qualified as the primary to account for the existence of a downstream channel 46 serving as a return path to lower rate signaling data than the data rate of the telecommunications service. Here in FIG. 1, and by way of example, the band of frequencies used on the uplink is the band V of frequencies between 47.2 and 53.4 GHz while the band of frequencies used on the downstream channel is the band. Q frequencies between 37.5 and 42.5 GHz. For the sake of simplification of FIG. 1, the satellite emission spot of the downstream channel 46 is not shown, the ground coverage of this unshown satellite emission spot being assumed to be congruent with the coverage of the satellite reception spot 44.
    Subsequently, the access link of any GW access station will primarily, unless specified differently, designate the uplink access link 42 from the GW access station to the satellite 6.
    Alternatively, the frequency band used on the uplink is the V band while the frequency band used on the downlink is the Ka band.
    In a variant, the frequency bands used on the uplink and on the downlink are optical bands.
    According to Figure 1 a set of clouds or cloud cover 52, interposed between the first nominal access station and the satellite 6, on the line of sight of the satellite, indicates the existence of a severe degradation of the propagation conditions and a high attenuation of the radio signals of the first access link 14. Thus, it is necessary to achieve as soon as possible a soft switch of telecommunications traffic to another access station.
    According to Figure 1, the site of implantation of the second redundant access station has favorable propagation conditions due to the absence of clouds obstructing the line of sight of the satellite 6 vis-à-vis the second redundant station As a result, the second redundant access station 8 can be used as an access station on which to perform soft switching of telecommunications traffic.
    According to Figure 1, it appears that two switching types of different types must be made for the implementation of the switchover, a first switching of the first type at the ground segment followed by a second switching second type at the edge of the satellite .
    The first ground segment traffic switching from the first access rated station to the second redundant access station is shown in Figure 1 in a virtual state of realization by a first arrow 62 having a dashed line border.
    The second switching of the traffic at the edge segment of the satellite from the first nominal access link to the satellite to the second redundant satellite access link is shown in FIG. 1 in a virtual state of realization by a second arrow 64 having a border in dashed lines. The second arrow 64 illustrates the second edge-level switching as a transition from the currently activated first satellite reception beam 44, corresponding to the first currently accessed nominal access link 14, a contour line 66 of which is drawn in line. uninterrupted, to a second virtual satellite reception beam 68 to be activated, corresponding to a second redundant access connection 70 of the second redundant access station 8 on which to tilt and of which a section of the contour surface 72 is drawn in broken lines .
    Thus, the space telecommunications system 2 is configured to implement a soft switching method that includes a phase of preparation of the switchover followed by a phase of execution of the switchover.
    The first access rated station 4, the second redundant access station 8 and the satellite 6 are configured to synchronously execute the first traffic switching at the ground segment between the first access rated station 4 and the second access station 4. redundant access station 8 before the second switching at the edge segment of the satellite 6 between the first access link 14 and the second redundant access link 70.
    The first access rated station 4 and the second redundant access station 8 are configured to be simultaneously active from the ground segment switching of the data traffic to the second redundant access station 8, to remain all two active until switching at the edge segment to the second redundant access link 8, only the first access rated station 4 is deactivated when the switching at the edge segment of the satellite 6 has taken place and is complete .
    According to Figure 1, it should be noted that prior to implementing the soft traffic switching between the first access rated station 4 and the second redundant access station 8, service traffic downlinks 72, 74 , for example in Ka-band, are respectively established from the satellite to the spatial terminals 22, 24 users, and signaling up-links 76, 78 are also respectively established from the space terminals 22, 24 users to the satellite . When the smooth switching of traffic to site diversity of access stations 6 takes place and switching to the edge segment of the satellite 6 between the first access link 14 and the second redundant access link 70 is executed the downlinks 72, 74 of service traffic to the user terminals 22, 24 as well as the upstream signaling links 76, 78 of the terminals 22, 24 to the satellite 6 are interrupted. This results in a loss of synchronization of the user terminals 22, 24 of the spatial telecommunication system 2 and a restoration of a new synchronization for each of the terminals 22, 24 whose duration is to be minimized.
    In order to reduce the resynchronization time of each of the terminals 22, 24, the second redundant access station 8 is configured for switching from the ground segment of the data traffic to the second redundant access station 8 , buffering the incoming data traffic switched to the ground level by a sufficient number of empty frames to be transmitted, and thus allow satellite terminals 22, 24 of the satellite telecommunications system to resynchronize as quickly as possible.
    In order to reduce the data loss in the buffer of the first access rated station 4, the first access rated station 4 is configured to, from the beginning of ground level traffic switching between the first and second access stations 4, 8 and before the start of edge-to-edge switching of beams or access links 14, 70, emptying a buffer containing traffic data not yet transmitted at the time of the start of traffic switching at the ground level between the first and second access stations 4, 8.
    The coordination and control station 32 of the space telecommunications system 2 is configured to make a decision to perform a soft changeover to access station diversity on the basis of a forecast of the unavailability events of the first link Rated access 14 of the first access rated station 4. This decision is taken from a weather forecast model or an estimate of the state of the channel, supported by the first nominal access link. An identification of the second redundant access station, here the second access link 70, on which the switchover takes place, a date and a duration of the switchover, are mentioned and described precisely in the switchover decision in order to be exploited as information data enabling the implementation of the switchover.
    The coordination and control station 32 of the space telecommunications system is also configured to control and perform a scheduling of the steps of the preparation phase of the failover in which a step of sending a satellite remote control TC to the satellite to modify the all of the satellite edge switching matrix 6 at a specified switching date, followed by a step of configuring the second redundant access station 8 with the configuration of the first access rated station are executed.
    The configuration of the second station 8, once performed, contains the configuration parameters of the first access access station 4 existing just before the start of the execution of the first switching. These parameters include RF radio frequency information data such as the frequency band, the power, and include the context of the terminals, including the access identifier, network, logon, service contract (SLA in English to be completed), parameters concerning the scheduler and the management of transmission resources, modulation / coding parameters for each of the space terminals of the space telecommunications system 2.
    According to FIG. 1, a third arrow 82 represents the sending of a satellite remote control TC to the satellite with verification of its good reception to modify the whole of the edge switching matrix of the satellite 6 at a specified switching date. Preferably, the sending of this remote control, carried out by the TMTC remote transmitting station 38 TMTC, takes place before the configuration of the second redundant access station 8 with the configuration of the first access rated station 4.
    The synchronization between the first traffic switching at the ground segment between the first access rated station 4 and the second redundant access station 8, and the second switching at the edge segment of the satellite 6 between the first nominal link d access 14 and the second redundant access link 70 is prepared by the coordination and control station 32. This preparation is implemented through the sending by the coordination and control station to the first and second stations of the access 4, 8 of a common instant of triggering the first traffic switching at the ground segment, and through the sending by the TC 38 remote control transmitting station of a satellite remote control TC to the satellite to change the entire satellite edge switching matrix to a switching date specified by the coordination and control station 32.
    As shown in FIG. 2, a soft site access site diversity switching method 102 for switching telecommunication data traffic between the first access station 4 to the relay satellite 6 of the space telecommunications system 2 to the second redundant access station 8 to the same satellite 6 is implemented when first access link 14 of the first access rated station 4 undergoes or will undergo an attenuation that does not allow the first access station 4 nominal d ensure proper transmission of traffic to the satellite 6.
    The failover method 102 includes a failover preparation phase 104 and a failover execution step 106, executed successively, wherein the first traffic switching at the ground segment between the first access rated station 4 and the second redundant access station, and the second switching at the edge segment of the satellite between the first access link 14 and the second redundant access link 70 are synchronized.
    The switching method 102 comprises a set of steps 108, 110, 112, 14, 116, 118, 120, 122, 124.
    In a first step 108, a prediction of the unavailability events of the first access nominal link 14 of the first access rated station 4 is performed on the basis of a weather forecast model or a channel estimator. supported by the first nominal access link 14.
    Then, in a second step 110, a decision to perform a soft changeover to access station diversity is made from the unavailability events predicted in the first step 102 and the first access link 14 of the First Rated Access Station 4. In the failover decision, the second redundant access station 8 on which the failover will take place, the date and duration of the failover are identified.
    Then in the preparation phase 104 of the smooth and parallel switching, a third step 112 and a fourth step 114 are executed.
    In the third step 112, the transmitting TCTC transmitting station TMTC sends a satellite remote control TC to the satellite 6 to modify the entire satellite edge switch matrix 6 at a switching date, specified by the radio station. coordination and control 32.
    In the fourth step 114, the second redundant access station 8 is configured with the configuration of the first access access station 4.
    Preferably, the sending of the remote control TC to the satellite 6 takes place before the configuration of the second redundant access station 8 with the configuration of the first nominal access station 4.
    Then, in the soft-switch execution phase 106, in a fifth ground-level switching step 116, the data traffic is switched to the second redundant access station 8. From the first switch at the ground segment from the data traffic to the second redundant access station 8, in a sixth step 118 the second redundant access station 8 buffers the incoming data traffic switched at ground level by a sufficient number of empty frames to enable satellite terminals 22, 24 of the satellite telecommunications system to resynchronize as quickly as possible. From the beginning of the first switching at the ground segment and in parallel, in a seventh step 120 the first access access station empty its buffer memory containing the traffic data not yet transmitted at the time of the beginning of the first switching of the ground level traffic between the first and second access stations 4, 8.
    Thus, from the beginning of the first switching at the ground segment of the data traffic to the second redundant access station 8, the first access rated station 4 and the second redundant access station 8 are simultaneously active, and both remain active until the second switching at the edge segment to the second redundant access link 70, where only the first access rated station 4 is then disabled.
    Then in an eighth step 122, the second switching at the edge segment of the satellite between the first access link 14 and the second access redundant link 70 is performed. This second switching is performed in parallel for the access link on the upstream channel and for the downstream channel. In this eighth step 122, the second satellite reception beam 68 (uplink) of the second redundant access link 70 and the second satellite transmit beam (downlink) of the second redundant access link are activated while the first beam Satellite reception 44 (uplink) of the first redundant access link and the first satellite transmit beam (downlink) of the first redundant access link 14 are deactivated. Once the second switching has been completed, the first nominal access link 14 of the first access rated station 4 is no longer active, and the second redundant access link 70 of the second redundant access station 8 is active. .
    Then, in the ninth step 124, the satellite terminals 22, 24 begin to receive the empty frames transmitted by the second redundant access station 70 allowing resynchronization of the modems of said satellite terminals 22, 24. The satellite terminals 22, 24 are then resynchronized on the forward path72, 74. The satellite terminals 22, 24 then receive signaling on the forward path allowing them to reuse the return link. The space telecommunications system 2 then again reached a nominal operating state.
    According to FIG. 3, a scheduling time diagram 202 describes the temporal sequence, along a horizontal time axis 204 in FIG. 3, of the actions carried out as part of the tilt process 102 according to the invention by the various elements of the control system. spatial telecommunications 2 of Figure 1 involved in the implementation of the switching method. These elements form passage points, temporally sequenced, traffic data and are schematically arranged from top to bottom on the diagram as a function of the transit time separating said points between them. The elements are: the point of interconnection to the POP service network, the second 8 GWp redundant access station, the first 4 GWn access rated station, the 6 SAT satellite, a satellite terminal, for example the terminal 22. The elements POP, GWp, GWn, SAT, and ST respectively correspond to time frames of the data 212, 214, 216, 218, 220.
    3, a first data stream 232 before the first ground segment switching and a second data stream 234 switched after the first ground segment switching are respectively represented by a first hatch pattern and a second dot pattern. different hatching.
    According to FIG. 3, the stage of preparation 104 of ground level switching is represented by a box 236 arranged before the steps of sending the empty frames by the second redundant access and emptying station of the buffer of the first station nominal access, represented subjectively by the frames 214, 216.
    According to Figure 3, the first characteristic of the soft switching method according to which the first switching at the ground segment to the second redundant access station 8 and the second switching at the edge level to the second redundant beam of the second redundant link d access are finely synchronized when running the failover is highlighted. The moment of triggering of the second switching at the edge level is chosen after the instant of the first effective ground switching of the traffic to the second redundant access station 8 where the first nominal access station 4 remains active and continues to operate. emit to empty its buffer.
    According to FIG. 3, the second characteristic of the soft switching method according to which the first access rated station 4 and the second access redundancy station 8 are simultaneously active from the instant of the first effective ground switching of the traffic to the second redundant access station 8 is also highlighted.
    According to FIG. 3, the third characteristic of the soft switching method according to which empty frames are transmitted by the second redundant access station 8 to the satellite terminals via the satellite 6 before sending them the empty packets or frames previously buffered so as to allow the satellite terminals 22, 24 to resynchronize as quickly as possible.
    The time frames described and their arrangement thus make it possible to switch to diversity of sites of stations through a synchronized switching between the edge and the ground. This switching of traffic between access stations is carried out in a flexible or soft way since the two access stations are active simultaneously, the actual switching of the traffic to the satellite terminals depending on the start date and the duration of the second switching. edge. Finally, sending empty frames on the new traffic data routing path makes it possible to speed up the resynchronization of the terminals and thus the restarting of the telecommunications service.
    The process, described above in Figures 1 to 3, has several advantages. On the one hand, the fine edge-ground synchronization makes it possible to minimize the cut-off time of the access-satellite link and thus to reduce the impact of the switchover on the telecommunications service provided to the user. On the other hand synchronization also allows a flexible switchover that does not require fine synchronization between the first access rated station and the second redundant access station. Both of these stations are active and operate in parallel to minimize data loss in the buffers and added latency. Finally, the sending by the second redundant access station of empty frames makes it possible to minimize the time necessary for the resynchronization of the satellite terminals while minimizing the data losses that could be induced by the non-operational state of the satellite terminals.
    权利要求:
    Claims (14)
    [1" id="c-fr-0001]
    CLAIMS .1 soft site access site diversity switching scheme for switching telecommunication data traffic between a first nominal access station (4) and a relay satellite (6) of a space telecommunications system ( 2) to a second redundant access station (8) at the same satellite when a first access link (14) of the first access rated station (4) is or will be attenuated which does not allow the first nominal access station (4) to ensure a correct transmission of the traffic to the satellite (6), characterized in that the switching method comprises a phase of preparation (104) of the failover and a phase of execution of the failover , executed next, in which a first traffic switching at the ground segment between the first access access station (4) and the second access redundant station (8), and a second switching n at the edge segment of the satellite (6) between the first nominal access link (14) and a second redundant access link (70) of the second redundant access station (70) to the satellite (6) are synchronized finely with each other.
    [2" id="c-fr-0002]
    A soft access station diversity switching method according to claim 1, wherein the first traffic switching at the ground segment between the first access access station (4) and the second access redundant station ( 8) is executed before the second switching at the satellite edge segment between the first access link (14) and the second access redundant link (70) are synchronized, and from the first switch at the ground segment of the data traffic to the second redundant access station (8), the first access rated station (4) and the second redundant access station (8) are simultaneously active, and both remain active until at the beginning of the second switching at the edge segment to the second redundant access link (70), where only the first access rated station (4) is then disabled.
    [3" id="c-fr-0003]
    A soft access station diversity switching method according to any one of claims 1 to 2, wherein the first traffic switching at the ground segment between the first access access station (4) and the second access station (4). redundant access station (8) is executed before the second switching at the edge segment of the satellite between the first access link (14) and the second access redundant link (70) are synchronized, and from the first switching at the ground segment of the data traffic to the second redundant access station (8), the second redundant access station (8) buffers the incoming data traffic switched at ground level by a sufficient number of frames empty to allow satellite terminals (22, 24) of the space telecommunications system (2) to resynchronize as quickly as possible.
    [4" id="c-fr-0004]
    4. Soft access station diversity switching method according to claim 3, wherein in parallel the first access access station (4) empties a buffer memory containing the traffic data not yet transmitted at the start of the transmission. first ground-level traffic switching between the first and second access stations (4, 8).
    [5" id="c-fr-0005]
    A soft access station diversity switching method according to any one of claims 1 to 4, wherein the preparation phase (104) comprises a step (114) of configuring the second redundant access station ( 8) with the configuration of the first first access station (4).
    [6" id="c-fr-0006]
    A soft access station diversity switching method according to any one of claims 1 to 5, wherein the preparation step (104) comprises a step (112) of sending a TC satellite remote control to satellite (4) to change the entire satellite edge switching matrix (4) to a specified switching date.
    [7" id="c-fr-0007]
    A soft access station diversity switching method according to any one of claims 1 to 6, wherein the preparation step comprises a step (112) of sending a TC satellite remote control to the satellite to modify the entire satellite edge switching matrix at a specified switching date, followed by a step (114) of configuring the second redundant access station (8) with the configuration of the first first station d access (4).
    [8" id="c-fr-0008]
    A soft access station diversity switching method according to any one of claims 1 to 7, comprising a decision step (110) of performing a soft switch to diversity of access stations to from a prediction (108) of the unavailability events of the first access nominal link (14) provided by the first access access station (4) from a weather forecast model or an estimator the channel supported by the first access link (14), the second redundant access station (8) on which the switchover occurs, the date and duration of the switchover being identified in the switch decision.
    [9" id="c-fr-0009]
    Spatial telecommunication system for smoothly switching telecommunication data traffic between a first (4) satellite access relay station (6) and a second redundant access station (8). same satellite (6) when a first access link (14) of the first access rated station (4) is or will be attenuated which does not allow the first access access station to transmit traffic to the satellite (6), the space telecommunications system comprising the telecommunications relay satellite (6), and the first access access station (4) and the second redundant access station (8), and ground network infrastructure (18) with high rate of interconnection of access stations (4, 8) and fed with data traffic at a predetermined network entry point, and a plurality of ter spatial minors (22, 24) telecommunications service users, and a coordination and control station (32) of the space telecommunications system, and a telemetry receiving station TMTC (TMTC) receiving and transmitting transmissions and to the satellite (6); the space telecommunications system being characterized in that it is configured to implement a soft failover method including a failover preparation phase (104), a failover execution phase, successively executed, a first traffic switching at the ground segment from the first access rated station (4) to the second redundant access station (8), and a second switching at the satellite edge segment (6) between the first access access link (14) and a second redundant access link (70) of the second redundant access station (8) being finely synchronized during the soft swing execution phase (106).
    [10" id="c-fr-0010]
    A space telecommunication system for smoothly switching telecommunication data traffic between two access stations according to claim 9, wherein the first access access station (4), the second access redundant station (8). ) and the satellite (4) are configured to synchronously perform the first traffic switching at the ground segment between the first access rated station (4) and the second access redundant station (8) before the second switch at the satellite edge segment between the first access link (14) and the second redundant access link (70), and the first access access station (4) and the second access redundant station ( 8) are configured to be simultaneously active from the beginning of the first switching at the ground segment of the data traffic to the second redundant access station (8), for r both remain active until the second switching at the edge segment to the second redundant access link (70), with only the first access access station deactivated during and after the second switching at the edge segment satellite.
    [11" id="c-fr-0011]
    A space telecommunications system for smoothly switching telecommunication data traffic between two access stations according to any one of claims 9 to 10, wherein the first access station (4), the second station redundant access (8) and the satellite (6) are configured to synchronously perform the first traffic switching at the ground segment between the first access rated station (4) and the second front redundant station (8). the second switching at the satellite edge segment between the first access link (14) and the second access redundant link (70), and the second access redundant station (8) is configured to, from from the first ground segment switching of the data traffic to the second redundant access station (8), buffering the incoming data traffic switched to the ground level by a number e sufficient empty frames to be transmitted to enable the satellite terminals (22, 24) of the satellite telecommunications system to resynchronize as quickly as possible.
    [12" id="c-fr-0012]
    A space telecommunication system for smoothly switching telecommunication data traffic between two access stations according to claim 11, wherein the first access rated station (4) is configured to, from the beginning of the first switching of the ground-level traffic to the second redundant access station (8), emptying at least one of its buffers containing the traffic data not yet transmitted at the time of the beginning of the first ground-level traffic switching between first and second access stations (4, 8).
    [13" id="c-fr-0013]
    Spatial telecommunications system for smoothly switching telecommunication data traffic between two access stations according to any one of claims 9 to 12, wherein the coordination and control station (32) of the telecommunications system is configured to make a decision to perform a soft change over to diversity of access stations based on a prediction of the unavailability events of the first access nominal link (14) of the first nominal station of access. access (4), said prediction being determined from a weather forecast model or an estimation of the channel state supported by the first nominal access link (14), an identification of the second redundant station on which the switchover will take place, the date and duration of the switchover being identified in said switchover decision, and for controlling and performing a scheduling of the steps of the preparation phase (104) of the switching said preparation phase (104) comprising a step (112) of sending a satellite remote control TC to the satellite to modify the whole of the switching matrix edge of the satellite at a specified switching date, and a step (114) of configuring the second redundant access station (8) with the configuration of the first first access station (4).
    [14" id="c-fr-0014]
    A space telecommunication system for smoothly switching telecommunication data traffic between two access stations according to claim 13, wherein the synchronization between the first traffic switching at the ground segment to the second redundant station, and the second switching at the edge segment of the satellite between the first nominal access link (4) and the second redundant access link (8) is prepared by the coordination and control station (32) through the sending by the coordination and control station (32) to the first and second access stations (4, 8) a time setpoint of the instant of tripping of the traffic switching at the ground segment, and through the sending by the transmitting station of remote controls (38) TC of a satellite remote control TC to the sateilite to modify the set of the switching matrix edge of the sat ellite at a switching date specified by the coordination and control station (32).
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    同族专利:
    公开号 | 公开日
    US10136373B2|2018-11-20|
    FR3051618B1|2018-11-23|
    EP3247149A1|2017-11-22|
    EP3247149B1|2020-08-05|
    CA2967592A1|2017-11-20|
    US20170339616A1|2017-11-23|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US6230013B1|1997-11-26|2001-05-08|Telefonaktiebolaget Lm Ericsson |Diversity handling moveover for CDMA mobile telecommunications|WO2020099077A1|2018-11-15|2020-05-22|Thales|Method and system for estimating attenuations of the respective uplinks of nominal satellite access station to a vhts very high throughput telecommunications satellite|US20040066347A1|2002-06-25|2004-04-08|Schiff Leonard Norman|Reducing service outages in a multibeam satellite system|
    FR2949629B1|2009-08-28|2011-10-21|Thales Sa|RF CHANNEL DUAL CHANNEL LINEARIZER CHANNEL AMPLIFIER AND TELECOMMUNICATION SATELLITE DEVICE COMPRISING SAID DEVICE|
    US9026042B1|2011-10-14|2015-05-05|Vt Idirect, Inc.|Method and apparatus for satellite communication with baseband switching over an IP network|US10219051B2|2016-08-12|2019-02-26|Space Systems/Loral, Llc|Communication platform with flexible photonics payload|
    CN107920375B|2017-12-15|2020-07-31|中国人民解放军32039部队|Data service switching method, device and system in spatial heterogeneous integrated network|
    US10601502B2|2018-02-05|2020-03-24|Hughes Network Systems, Llc|Systems and methods for flexible assignment of beams to gateways in a high throughput digital payload satellite network|
    EP3794747A1|2018-05-17|2021-03-24|Thales|Method for managing the telecommunication data traffic of a very high throughput satellite communication system|
    FR3083944B1|2018-07-12|2020-07-03|Thales|HIGH-SPEED SATELLITE COMMUNICATION SYSTEM INCLUDING AT LEAST ONE POWER SATELLITE PROVIDING ON-BOARD PROCESSING|
    US11044007B2|2018-10-10|2021-06-22|Hughes Network Systems, Llc|System and apparatus for disaster backup gateway for a multi-gateway spot beam satellite|
    US10771331B2|2018-11-07|2020-09-08|Cisco Technology, Inc.|Closed loop control for fixing network configuration issues to aid in device classification|
    US10938652B1|2019-08-20|2021-03-02|Hughes Network Systems, Llc|Gateway diversity switching|
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    优先权:
    申请号 | 申请日 | 专利标题
    FR1600809A|FR3051618B1|2016-05-20|2016-05-20|METHOD FOR SOFT DIVERSITY SWITCHING OF SITES OF ACCESS STATIONS IMPLEMENTED IN A SPACE TELECOMMUNICATIONS SYSTEM|
    FR1600809|2016-05-20|FR1600809A| FR3051618B1|2016-05-20|2016-05-20|METHOD FOR SOFT DIVERSITY SWITCHING OF SITES OF ACCESS STATIONS IMPLEMENTED IN A SPACE TELECOMMUNICATIONS SYSTEM|
    EP17170182.4A| EP3247149B1|2016-05-20|2017-05-09|Smooth changeover method with a variety of access stations implemented in a spatial telecommunications system|
    US15/594,579| US10136373B2|2016-05-20|2017-05-13|Soft handover method using gateway sites diversity and implemented in a space telecommunication system|
    CA2967592A| CA2967592A1|2016-05-20|2017-05-17|Soft handover method using gateway sites diversity and implemented in a space telecommunication system|
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