CN103607343A - Mixed switching structure suitable for satellite-borne processing transponder - Google Patents
Mixed switching structure suitable for satellite-borne processing transponder Download PDFInfo
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Abstract
A mixed switching structure suitable for a satellite-borne processing transponder comprises entry port processing units, a sharing buffer, a space division switching unit, a switching control unit and frame shapers. Then entry port processing units perform adaptation and sorting processing on time slot frames, and output two paths after processing, a path of continuous time slot frames are sent to the space division switching unit, and a path of packet data stream is sent to the sharing buffer; the sharing buffer is used for distribution and mapping management of buffer memory space, and outputs corresponding packets to the frame shaper of a specified port according to a dispatching instruction; the space division unit sends time slots of the entry port to the frame shaper according to control information; the frame shaper puts the time slots in a specified time slot cache region, the packets output by the sharing buffer are packaged to unoccupied business time slots according to priority, and data serial output of the specified time slot cache region is read according to a frame start sending instruction. The mixed switching structure suitable for the satellite-borne processing transponder can support a circuit switching service and a packet switching service of various speeds, and can support any ratio of the two services.
Description
Technical field
The present invention relates to a kind of hybrid switching structure that is applicable to spaceborne processing transponder, belong to the spaceborne exchange of satellite communication field.
Background technology
In multidrop beam satellite communication system, spaceborne switching technology completes all Service Switching Functions on star, thereby has improved the real-time of business transmission and effectively utilized frequency resource.Existing spaceborne switching technology can be divided into spaceborne circuit switching and spaceborne packet switching two classes.
Spaceborne circuit switching needs communicating pair to set up a physical path of being monopolized by both sides before communication, and this physical channel can be time slot (spaceborne exchange-time division multiple access SS/TDMA), be sub-band (spaceborne exchange-frequency division multiple access SS/FDMA) or spreading code (spaceborne exchange-code division multiple access SS/CDMA):
SS/TDMA be take sub-slots as exchangeable object, and MSM (microwave switching matrix) and DCU (distribution control unit) are set on satellite.By DCU, control MSM by definite sequence exchange connection status, each ground station, according to the moment burst being ranked, realizes business transmission exchange.On INTELSAT-V satellite, be applied at first, at a plurality of satellites such as ACTS, have and also have application.
SS/FDMA be take sub-band as exchangeable object, by " switch matrix on subscriber signal separation+star+subscriber signal merges ", realizes subband exchange.The WGS of U.S. army (Wideband Global SATCOM) system just adopts the spaceborne exchange hierarchy of SS/FDMA.
SS/CDMA realizes the separation of different user by orthogonal code, on star not to decoding data.Signaling control signal is transmitted by control channel, in control unit, processes.Satellite based on CDMA system adopts this exchanged form substantially.
Spaceborne packet switching is mostly based on Multiplexing Technology, and grouping is processed and shared bandwidth resources by queuing, scheduling etc., and the procotols such as network utilisation ATM, IP and MPLS are safeguarded the required Virtual Channel of transfer of data.Spaceborne packet switching is to take packet as cross-over unit, packet carries the information such as destination address, source address, on star, routing node adopts the transmission means of storage forwarding, mainly contains at present spaceborne ATM (Asynchronous Transfer Mode asynchronous transfer mode) exchange, spaceborne IP (agreement interconnecting between Internet Protocol network) exchange etc.The U.S. has adopted spaceborne ATM exchange at the test satellite ACTS of transmitting in 1993; Base band exchange processor on the star that Canada's AnikF2 satellite adopts is also to adopt the mode of ATM cell exchange to realize the 2Mbits/s exchanges data of point-to-point.In November, 2009, First space router-Cisco 18400 carries Intelsat14 communication satellite and enters geo-stationary orbit in the world.Cisco's Unified Communication treatment system, IPv6, Mobile IP and Simple Network Management Protocol etc.
Wherein, ACTS satellite (Advanced Communications Technology Satellite:NASA development) has exchanged form on two kinds of stars: a kind of is by microwave switching matrix, and another kind is by having the baseband processor of storage.In switch matrix (MSM) mode, with it, connect three fixed beams or two bunches of saltus step wave beams, switch matrix can provide bend pipe transparent exchange.In baseband processor (BBP) mode, by packet switching, provide demand assignment multiple access (DAMA) channel, thereby satellite resource is maximized the use.
Spaceborne circuit-switched technology is difficult to realize the statistic multiplexing to link circuit resource, and each link setup all needs by control channel application, introduces long time delay; Spaceborne packet-switch technology need be carried out error control, and existence is overflowed loss and need be carried out congestion control, and delay variation performance real-time but business can not get ensureing.
At present, satellite is processed load or is adopted circuit switching system, or adopts packet switching system, in Base-Band Processing part, two kinds of exchange hierarchies is not merged; Because no matter which kind of exchange hierarchy, can pass through adapted transmission multiple business, just in performance, only can meet the demand of part type service.Circuit-switched service is applicable to maintain secrecy higher with reliability requirement, sudden little business; And packet switching service is applicable to secrecy and reliability requirement is not high, sudden strong speech, image and video traffic, and work as satellite, need to support well above-mentioned two kinds of types of service, and the ratio of two types is to change arbitrarily in business model, hybrid switching structure can meet this demand.
Part satellite adopts " packet switching of the transparent exchange+Base-Band Processing of bend pipe of microwave switching matrix " mixed structure, two kinds of dissimilar load realize the support for different kinds of business, be divided into two kinds of physical layer systems: processing and exchanging load (containing Base-Band Processing) on transparent forwarding load and star on star, but this mixed structure has caused whole spaceborne processing procedure flexibility poor.Thereby urgent need research is now a kind of, merging well of circuit-switched architecture and packet switching construction can be met to satellite communication system to the flexibility of business support (the type of service combination of variable-scale) demand.
Summary of the invention
Technology of the present invention is dealt with problems and is: overcome the deficiencies in the prior art, a kind of hybrid switching structure that is applicable to spaceborne processing transponder is provided, by " space switching device+shared buffer sorting memory+frame shaper " hybrid switching structure, guarantee baseband circuit exchange and performance self-defined and the standard packet reciprocal exchange of business, thereby met the flexibility demand of satellite communication system to business support.
Technical solution of the present invention is:
A kind of hybrid switching structure that is applicable to spaceborne processing transponder comprises: inbound port processing unit, shared buffer memory device, space switching unit, switching control unit and frame shaper;
Inbound port processing unit carries out adaptation, classification processing to the time slot frame receiving, inbound port processing unit will be delivered to space switching unit after the synchronous adjustment in time slot Zheng Yi road, and another road is planned to take out grouping in corresponding time slot according to time slot allocation and delivered to shared buffer memory device; Shared buffer memory device is for distribution and the mapping management of spatial cache, described buffer memory is the grouping that inbound port processing unit sends, shared buffer memory device is looked into transmit according to the destination address in grouping and is obtained output port sequence number simultaneously, and for it, distribute buffer address piece according to grouping information length, and indicate output grouping to the frame shaper of designated port according to scheduling; The time slot frame that space switching unit is sent inbound port processing unit here is delivered to frame shaper according to control information; Frame shaper is put into the output of space switching unit the time slot of appointment according to the sequence control information of switching control unit, and the grouping of shared buffer memory device output is according to priority encapsulated in idle business time-slot, the data serial output of assigned timeslot buffer area is periodically read in the initial transmission indication of frame providing according to switching control unit simultaneously with port speed.
Described inbound port processing unit comprises grouping cache module, dispatching control module and frame synchronization adjusting module; Inbound port processing module data processing is divided into two-way, grouped data is extracted in the time slot allocation plan that wherein a routing packets cache module and dispatching control module provide according to switching control unit, complete verification storage, and deliver to shared buffer memory device according to the mutual indication of shared buffer memory device; The synchronous adjusting module of another routing frame will be sent to space switching unit in the unified moment after the time slot frame buffering receiving.
Described shared buffer memory device comprises scheduling and buffer memory distribution module and N outbound port buffer queue; Scheduling receives from the grouping information storage resource request of inbound port processing unit 1～N and according to the destination address in packet header information, looks into transmit and obtain output port sequence number with memory allocation module, and for it, distributes buffer address piece according to grouping information length; Scheduling completes after spatial cache distributes and provides mutual indication and dispatch indication with memory module, inbound port processing unit is according to indicating the data placement in grouping information in data/address bus alternately, scheduling is obtained data with memory allocation module from data/address bus and is placed on N corresponding to an output port sequence number outbound port buffer queue, and the scheduling of shared buffer memory device is taken out according to scheduling indication the grouping that output buffer queue medium priority is the highest with memory allocation module and outputed to frame shaper corresponding to output port sequence number.
Described switching control unit is mainly comprised of signaling processing module, circuit switching control module and buffering output control module; Signaling processing module generates time slot allocation plan and is sent to inbound port processing unit according to satellite system resource allocation result, for inbound port processing unit, extracts grouping information; Signaling processing module to the sending time slots control information of frame shaper and and the initial transmission of frame indication, described sequence control information comprises from positional information corresponding to the time slot data of space switching unit, the transmission control that the initial transmission indication of described frame is exported for frame shaper data serial; Circuit switching control module generates control information according to the signaling result of Circuit Service and mails to space switching unit, and described control information comprises selector switch controlling value and time slot benchmark etc.; Buffer output control module is for controlling the packet count of each Port Scheduling output in shared buffer memory device one frame time, and controls shared buffer memory device and adopt bus robin scheduling mode to take out from N outbound port buffer queue to divide into groups to deliver to corresponding frame shaper.
The present invention's beneficial effect is compared with prior art:
(1) the present invention adopts " space switching device+shared buffer sorting memory+frame shaper " hybrid switching structure, the business model that this mixed structure is supported is more flexible, is no matter that Circuit Service user or Packet Service are with can directly using per family native system finishing service to continue.
(2) the present invention can ensure the superperformance of Circuit Service and Packet Service, and the performance separately of Circuit Service and Packet Service can not be affected because of the variation of type of service portfolio ratio.
(3) switching fabric flexible design of the present invention, module is clear, is convenient to upgrade integrated, and cost is lower, has good Project Realization.
Accompanying drawing explanation
Fig. 1 is system architecture schematic diagram of the present invention;
Fig. 2 is that inbound port processing unit of the present invention forms schematic diagram;
Fig. 3 is that space switching of the present invention unit forms schematic diagram;
Fig. 4 is space switching cell operation principle schematic of the present invention;
Fig. 5 is shared buffer memory device principle schematic of the present invention;
Fig. 6 is that switching control unit of the present invention forms schematic diagram;
Fig. 7 is that frame shaper of the present invention forms schematic diagram.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is further described in detail.
The invention provides a kind of hybrid switching structure that is applicable to spaceborne processing transponder, based on space switch and shared buffer memory structure, realizing the classification of different system business processes, by frame shaper, realize the merging of Circuit Service and Packet Service and export, and then can take into account the flexibility of Packet Service and reliable, the non-jitter characteristic of Circuit Service.The present invention makes limited star ground communication link resources reasonably be distributed and allocate, and supports better various types of circuit, packet switching service.
As shown in Figure 1, the present invention includes inbound port processing unit, shared buffer memory device, space switching unit, switching control unit and frame shaper.Inbound port processing unit carries out adaptation, classification processing to the time slot frame receiving, inbound port processing unit will be delivered to space switching unit after the synchronous adjustment in time slot Zheng Yi road, and another road is planned to take out grouping in corresponding time slot according to time slot allocation and delivered to shared buffer memory device; Shared buffer memory device is for distribution and the mapping management of spatial cache, described buffer memory is the grouping that inbound port processing unit sends, shared buffer memory device is looked into transmit according to the destination address in grouping and is obtained output port sequence number simultaneously, and for it, distribute buffer address piece according to grouping information length, and indicate output grouping to the frame shaper of designated port according to scheduling; The time slot frame that space switching unit is sent inbound port processing unit here is delivered to frame shaper according to control information; Frame shaper is put into the output of space switching unit the time slot of appointment according to the sequence control information of switching control unit, and the grouping of shared buffer memory device output is according to priority encapsulated in idle business time-slot, the data serial output of assigned timeslot buffer area is periodically read in the initial transmission indication of frame providing according to switching control unit simultaneously with port speed.
As shown in Figure 2, inbound port processing unit comprises grouping cache module, dispatching control module and frame synchronization adjusting module; Inbound port processing module data processing is divided into two-way, grouped data is extracted in the time slot allocation plan that wherein a routing packets buffer memory and scheduling controlling provide according to switching control unit, complete verification storage, and according to the mutual indication of shared buffer memory device, deliver to the assigned address of shared buffer memory device; After the time slot frame buffering that the synchronous adjusting module of another routing frame receives each inbound port processing module, in the unified moment, be sent to space switching unit, after this according to the frame period, keep the synchronous regime after adjustment.If when the front-end processing of satellite processing load does not reach Complete Synchronization, frame synchronization adjusting module has guaranteed that the frame of each port of space switching unit is consistent with time slot position, thereby has guaranteed the accurate exchange of data.
As shown in Figure 3,4, space switching unit consists of the regular line in inside N 1:N selector switch and N N:1 selector switch, each selector switch has 1 control register, control register is stored the positional value of each time slot switch, determine, the choice relation between outlet, the time slot benchmark that selector switch provides according to control unit completes lambda line and controls to the switch of outlet.The time slot of port one 2 with an example, illustrates the operation principle of space switching unit selector switch below: if need to exchange to the time slot 63 of port 5, during time slot 2, sequence number is that the control register controlling value of 1 1:N selector switch is updated to 5, and the control register controlling value of the N:1 selector switch that sequence number is 5 is updated to 5; So, space switching unit exports the content of time slot 2 to frame shaper 5, and the Content placement that frame shaper sends port one time slot 2 according to the control information of switching control unit is in the position of time slot 63.Space switching unit is merely able to be swapped out lambda line, can not adjust time slot position, therefore in frame shaper, completes time slot position adjustment, coordinates space switching unit to complete the exchange of circuit time slot.
As shown in Figure 5, shared buffer memory device forms by dispatching with buffer memory distribution module and N outbound port buffer queue.Scheduling receives the grouping information storage resource request from inbound port processing unit 1～N with memory allocation module, in this information, comprise packet header information, scheduling is looked into transmit according to the destination address in packet header information with memory allocation module and is obtained output port sequence number, and for it, distribute buffer address piece according to grouping information length, if scheduling is not found output port sequence number or is not had available cache memory space to distribute with memory allocation module, the inbound port processing unit request that refusal is filed an application; Scheduling completes after spatial cache distributes and provides indication with memory module, inbound port processing unit is according to indicating the data placement in grouping information in data/address bus, scheduling obtains from data/address bus output port buffer queue corresponding to output port sequence number that data are placed on the acquisition of tabling look-up with memory allocation module, and is recorded to the address block chained list of this queue.The operation that the inquiry of shared buffer memory device is transmitted and the operation of stores packets information walk abreast and carry out, and complete the processing of next grouping information storage resource request in storage current group information.Scheduling and memory allocation module are taken out grouping that output buffer queue medium priority is the highest and are outputed to frame shaper corresponding to output port sequence number (scheduling and memory allocation module can adopt any known packet-priority dispatching algorithm, or the design parameter during according to practice improves by concrete implementer) herein.
As shown in Figure 6, switching control unit is mainly comprised of signaling processing module, circuit switching control module and buffering output control module.Signaling processing module receives the control packet (control packet carries all kinds of signaling messages) extracting from each inbound port processing unit and processes, according to result, can obtain the link setup of Circuit Service and tear chain information open, can obtain satellite time benchmark, can determine that resource distributes and complete the renewal etc. of forwarding of packets table, the control packet (carrying response signaling, broadcast signaling etc.) that need to send to output port sends to frame shaper and is placed in control slot; Signaling processing module generates the time slot allocation plan of mailing to each inbound port processing unit according to satellite system resource allocation result, for inbound port processing unit, extract grouping information, indicate carries data packets in each which time slot of inbound port processing module, carrier signaling grouping in which time slot; Signaling processing module is to the control information of frame shaper sending time slots, sequence control information comprises from positional information corresponding to the time slot data of space switching unit, it is each time slot, frame shaper entrance time slot content is positioned over the time slot position of output frame buffer memory, in front example, the time slot 2 of port one need to exchange to the time slot 63 of port 5, and control information is herein " input time slot 2+ deposits time slot position 63 ", while realizing, can encapsulate as required control information structure.Circuit switching control module generates the control information (comprising each selector switch controlling value and time slot benchmark etc.) of mailing to space switching unit according to the signaling result of Circuit Service; Because the ratio of Circuit Service and Packet Service is real-time dynamic change, therefore Buffer output control module is controlled the packet count of each Port Scheduling output in shared buffer memory device one frame time, and control shared buffer memory device employing bus robin scheduling mode and from buffer queue, take out the frame shaper that each port is delivered in grouping, each frame shaper receives and divides into groups and be placed into the time slot (control packet is positioned in the control slot of switching control unit appointment, and IP grouping or self-defined grouping etc. are positioned in idle business time-slot) for carrying grouping.
As shown in Figure 7, frame shaper is mainly comprised of output frame cache module and transmission control module, frame buffer module comprises and writes control module and output frame buffering area, write control module according to sequence control information, in real time the time slot from space switching unit is write to output frame buffering area assigned timeslot, the grouping from shared buffer memory device of receiving is according to priority sequentially write to the idle business time-slot in output frame buffering area; Output frame buffering area arranges buffer size according to frame length, by writing control module, according to sequence control information, controls write circuit business time-slot and grouping, by sending control module periodic sequence sense data.Send control module and rise according to output port speed and read successively the data of each time slot buffer position and send continuously with time slot frame format at frame synchronization delivery time, from initial time slot, to last slot cycle circulation, read.Frame synchronization delivery time need to postpone 1 time slot constantly than the frame synchronization of the frame synchronization adjusting module of input port processing unit, to avoid reading while write same memory space generation read/write conflict.
Specific works flow process of the present invention is as follows:
The present invention controls and space switching switch matrix control by slot synchronization, makes Mix traffic circuit switched slot to be delivered to the frame shaper of corresponding ports according to link setup indication.In the inner meeting of frame shaper, according to control information indication, be placed in corresponding output frame cache module, slot synchronization information produces at the inner counting of program according to time reference on frame structure rule and star, is then distributed to inbound port processing module, switching control unit and frame shaper.Wherein, entrance grouping extraction module extracts grouping according to slot synchronization information and plan of distribution; Switching control unit completes switch according to slot synchronization control information and controls; Outbound port frame shaper is placed into corresponding time slot buffer address according to slot synchronization information and Export resource plan of distribution by transparent transmission time slot.
The unspecified part of the present invention belongs to general knowledge as well known to those skilled in the art.
Claims (5)
1. a hybrid switching structure that is applicable to spaceborne processing transponder, is characterized in that comprising: inbound port processing unit, shared buffer memory device, space switching unit, switching control unit and frame shaper;
Inbound port processing unit carries out adaptation, classification processing to the time slot frame receiving, inbound port processing unit will be delivered to space switching unit after the synchronous adjustment in time slot Zheng Yi road, and another road is planned to take out grouping in corresponding time slot according to time slot allocation and delivered to shared buffer memory device; Shared buffer memory device is for distribution and the mapping management of spatial cache, described buffer memory is the grouping that inbound port processing unit sends, shared buffer memory device is looked into transmit according to the destination address in grouping and is obtained output port sequence number simultaneously, and for it, distribute buffer address piece according to grouping information length, and indicate output grouping to the frame shaper of designated port according to scheduling; The time slot frame that space switching unit is sent inbound port processing unit here is delivered to frame shaper according to control information; Frame shaper is put into the output of space switching unit the time slot of appointment according to the sequence control information of switching control unit, and the grouping of shared buffer memory device output is according to priority encapsulated in idle business time-slot, the data serial output of assigned timeslot buffer area is periodically read in the initial transmission indication of frame providing according to switching control unit simultaneously with port speed.
2. a kind of hybrid switching structure that is applicable to spaceborne processing transponder according to claim 1, is characterized in that: described inbound port processing unit comprises grouping cache module, dispatching control module and frame synchronization adjusting module; Inbound port processing module data processing is divided into two-way, grouped data is extracted in the time slot allocation plan that wherein a routing packets cache module and dispatching control module provide according to switching control unit, complete verification storage, and deliver to shared buffer memory device according to the mutual indication of shared buffer memory device; The synchronous adjusting module of another routing frame will be sent to space switching unit in the unified moment after the time slot frame buffering receiving.
3. a kind of hybrid switching structure that is applicable to spaceborne processing transponder according to claim 1, is characterized in that: described shared buffer memory device comprises scheduling and buffer memory distribution module and N outbound port buffer queue; Scheduling receives from the grouping information storage resource request of inbound port processing unit 1～N and according to the destination address in packet header information, looks into transmit and obtain output port sequence number with memory allocation module, and for it, distributes buffer address piece according to grouping information length; Scheduling completes after spatial cache distributes and provides mutual indication and dispatch indication with memory module, inbound port processing unit is according to indicating the data placement in grouping information in data/address bus alternately, scheduling is obtained data with memory allocation module from data/address bus and is placed on N corresponding to an output port sequence number outbound port buffer queue, and the scheduling of shared buffer memory device is taken out according to scheduling indication the grouping that output buffer queue medium priority is the highest with memory allocation module and outputed to frame shaper corresponding to output port sequence number.
4. a kind of hybrid switching structure that is applicable to spaceborne processing transponder according to claim 1, is characterized in that: described switching control unit is mainly comprised of signaling processing module, circuit switching control module and buffering output control module; Signaling processing module generates time slot allocation plan and is sent to inbound port processing unit according to satellite system resource allocation result, for inbound port processing unit, extracts grouping information; Signaling processing module to the sending time slots control information of frame shaper and and the initial transmission of frame indication, described sequence control information comprises from positional information corresponding to the time slot data of space switching unit, the transmission control that the initial transmission indication of described frame is exported for frame shaper data serial; Circuit switching control module generates control information according to the signaling result of Circuit Service and mails to space switching unit, and described control information comprises selector switch controlling value and time slot benchmark etc.; Buffer output control module is for controlling the packet count of each Port Scheduling output in shared buffer memory device one frame time, and controls shared buffer memory device and adopt bus robin scheduling mode to take out from N outbound port buffer queue to divide into groups to deliver to corresponding frame shaper.
5. a kind of hybrid switching structure that is applicable to spaceborne processing transponder according to claim 1, it is characterized in that: described frame shaper is mainly comprised of output frame cache module and transmission control module, frame buffer module comprises and writes control module and output frame buffering area, write control module according to sequence control information, in real time the time slot from space switching unit is write to output frame buffering area assigned timeslot, the grouping from shared buffer memory device of receiving is according to priority sequentially write to the idle business time-slot in output frame buffering area; Output frame buffering area arranges buffer size according to frame length, by writing control module, according to sequence control information, controls write circuit business time-slot and grouping, by sending control module with port speed periodic sequence sense data; Send control module and rise according to output port speed and read successively the data of each time slot buffer position and send continuously with time slot frame format at frame synchronization delivery time, from initial time slot, to last slot cycle circulation, read.
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| JP2019068407A (en) * | 2017-08-17 | 2019-04-25 | ザ・ボーイング・カンパニーＴｈｅ Ｂｏｅｉｎｇ Ｃｏｍｐａｎｙ | System and method for configuring on-vehicle switch matrix on the basis of network information |
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| CN114944867A (en) * | 2022-05-30 | 2022-08-26 | 中国电子科技集团公司第五十四研究所 | IP-based circuit packet time slot burst generation and analysis device |
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Application publication date: 20140226 Assignee: BEIJING SHENG'AN TONGLI TECHNOLOGY DEVELOPMENT Co.,Ltd. Assignor: XI''AN INSTITUTE OF SPACE RADIO TECHNOLOGY Contract record no.: X2024980002526 Denomination of invention: A Hybrid Switching Architecture Suitable for Spaceborne Processing Forwarders Granted publication date: 20161228 License type: Common License Record date: 20240306 |