CN102883374B - Resource distribution method for satellite communication system - Google Patents
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- CN102883374B CN102883374B CN201210388489.5A CN201210388489A CN102883374B CN 102883374 B CN102883374 B CN 102883374B CN 201210388489 A CN201210388489 A CN 201210388489A CN 102883374 B CN102883374 B CN 102883374B
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Abstract
The invention discloses a resource distribution method for a satellite communication system. The method comprises the following steps that: service general packet radio service (GPRS) supporting node (SGSN) sends a service resource request to a master station according to the service application of an attached satellite terminal; the master station determines a service resource of the service application of the attached satellite terminal according to the service resource request; and the master station receives the data sent by the SGSN according to the service resource. The invention also provides a method for distributing resources to the satellite terminal by the master station in the satellite communication system, and the method comprises the following steps that: the satellite terminal sends resource request signaling to the master station; the master station determines a time slot resource according to the resource request signaling of the satellite terminal; and the satellite terminal sends data to the master station according to the time slot resource determined by the master station. By the method, quality of service (QoS) guarantee strategy of a service is provided for the satellite communication system through 3rd generation (3G) core network mature equipment, the utilization rate of satellite wireless resources is improved by resource distribution for different types of services and signaling, and real-time performance of the bearer service of the satellite communication system is guaranteed.
Description
Technical field
The invention belongs to technical field of satellite communication, relate to a kind of resource allocation methods of satellite communication system, also relate to the resource allocation methods in a kind of satellite communication system between main website and ICBM SHF satellite terminal simultaneously.
Background technology
Satellite communication is compared other communication technologys and is had unique advantage, and especially it is not by the impact of the factor such as geographical environment, positional distance.Current communication technology of satellite fast development, the appearance of Large Copacity broadband connections satellite makes satellite communication carry various multimedia service becomes possibility.Along with the extensive use of satellite communication, its networking scale constantly expands, and the terminal quantity of access satellite communication system is also in continuous increase.Satellite communication system in the past cannot carry out detailed differentiation to carried Packet Service in Resourse Distribute, especially when terminal quantity is huge, the distribution of Radio Resource can not be completed according to different terminals different service types, QoS support process can not be embodied in the process of Resourse Distribute, lack the strict control to real-time service transmission.
Summary of the invention
Technology of the present invention is dealt with problems and is: in order to ensure high efficiency and the validity of extensive ICBM SHF satellite terminal Resourse Distribute, the invention provides a kind of resource allocation methods of satellite communication system, this method is after accessing 3G core net by inserting of satellite part, 3G core net mature equipment is adopted to provide QoS of survice guarantee strategies for satellite communication system, the business dissimilar to inserting of satellite part and signaling carry out the utilance that Resourse Distribute improves satellite radio resource, ensure that the Real-time Ability of this satellite communication system bearer service.
Technical solution of the present invention is:
Resource allocation methods of the present invention comprises the following steps:
(1) described SGSN is according to the business application of the ICBM SHF satellite terminal be attached, and sends service resources request, and proceed to step (2) to main website;
(2) described main website determines the service resources described in business application of the ICBM SHF satellite terminal be attached according to service resources request; If described main website can meet service resources described in this, then proceed to step (3), otherwise notify that described SGSN sends service resources request according to described business application again;
(3) described main website receives the data that described SGSN sends according to described service resources; And described data are carried out to separation obtains wireless connections signaling queue, Packet Service queue is connected signaling queue with Packet Service;
(4) described main website is better than Packet Service connection signaling according to wireless connections signaling and is better than the order of Packet Service to described ICBM SHF satellite terminal transmission wireless connections signaling queue, Packet Service queue or Packet Service connection signaling queue.
Further, in above-mentioned resource allocation methods, described service resources request distributes demand signalling by described SGSN by RAB and is sent to described main website,
Further, in above-mentioned resource allocation methods, described main website determines described service resources according to the QoS information of the type of service of service resources request, service rate and business.
Further, in above-mentioned resource allocation methods, the ICBM SHF satellite terminal be attached is completing before the attachment of described 3G core net, and described 3G core net is made an addition to described Packet Service to the attachment signaling that described ICBM SHF satellite terminal sends and connects in signaling queue by described main website.
Further, in above-mentioned resource allocation methods, described main website is that each ICBM SHF satellite terminal be attached maintains one for keeping connection, and resists the static resource of burst flow.
In above-mentioned satellite communication system, main website is to the resource allocation methods of ICBM SHF satellite terminal, comprises the following steps:
ICBM SHF satellite terminal by with the signaling being used between main website maintaining wireless connections, the grouped data received and be used for maintaining the signaling dividing into groups to be connected between described 3G and add wireless connections signaling queue, Packet Service queue respectively and divide into groups to connect signaling queue, send resource request signaling to main website simultaneously;
Described main website is according to the resource request signaling determination time interval resource of described ICBM SHF satellite terminal;
The time interval resource that described ICBM SHF satellite terminal is determined according to described main website is connected signaling queue to described main website transmission wireless connections signaling queue, Packet Service queue and grouping.
Further, in above-mentioned main website in the resource allocation methods of ICBM SHF satellite terminal, if described main website cannot determine time interval resource when receiving the resource request signaling of ICBM SHF satellite terminal, then after waiting system setting-up time, again according to described resource request signaling determination time interval resource.
Further, in above-mentioned main website in the resource allocation methods of ICBM SHF satellite terminal, described time interval resource passes through burst planned time signalling to described ICBM SHF satellite terminal by described main website.
Further, in above-mentioned main website in the resource allocation methods of ICBM SHF satellite terminal, described ICBM SHF satellite terminal utilizes passed-back traffic burst packets send wireless connections signaling queue, Packet Service queue to described main website and divide into groups to be connected signaling queue, and wherein wireless connections signaling queue is filled in the signaling moiety of described passed-back traffic burst packets; Described Packet Service queue is connected signaling queue is filled in described passed-back traffic burst packets data division according to the order maintaining the signaling of wireless connections and be better than Packet Service with described grouping.
The present invention compared with prior art tool has the following advantages:
(1) the present invention effectively can improve the Real-time Ability of institute's bearer service.The method that the present invention adopts resource allocation methods to combine with the QoS characteristic of bearer service, 3G core net provides qos policy for carried business, different Packet Services maps in different QoS characteristic queues according to the qos policy obtained by main website, when Resources allocation, be Packet Service Resources allocation according to different dispatching priorities, to reach the qos requirement that core net configures.This resource allocation methods is based on QoS of survice characteristic, and Resource Allocation Formula meets business transmission requirement more, effectively can reduce propagation delay time and the delay variation of high real-time business, improves the transmission guarantee of real-time service.
(2) the present invention can reduce the generation of satellite communication system resource overload situation.The present invention adopts according to system current resource situation access service access, when main website obtains qos parameter, first according to the service resources request of application business, check that whether bottom Radio Resource is enough, if inadequate resource, then do not access this business, by this mechanism, can prevent from when resource-constrained, access new application business, cause system burst flow excessive, affect the transmission of bearer service.
(3) the present invention can complete the resource allocation task of extensive ICBM SHF satellite terminal.Current satellite communication system needs the ICBM SHF satellite terminal quantity of access constantly to increase, the disposal ability of Resourse Distribute and the efficiency utilization of resource are the important indicators of a test satellite communication system, the present invention carry the dispatching method that resource allocation methods adopts signaling and service detach, qos policy according to 3G core net is that different business distributes time interval resource, effectively can improve the utilance of satellite radio resource, avoid occurring fighting for resource and the system crash that causes owing to crossing multiple access ICBM SHF satellite terminal.
Accompanying drawing explanation
Fig. 1 is satellite communication system schematic diagram;
Fig. 2 is main website forward link resources distribution method flow process;
Fig. 3 is ICBM SHF satellite terminal return link resource allocation methods flow process.
Embodiment
Just by reference to the accompanying drawings the present invention is described further below.
Be illustrated in figure 1 in the present invention the satellite communication system composition accessing 3G core net, in FIG, native system is made up of two parts, and a part is inserting of satellite part: comprise ICBM SHF satellite terminal, main website, satellite; A part is 3G equipment of the core network: comprise SGSN (Serving GPRS Support Node; GPRS: GPRS), GGSN (GGSN: Gateway GPRS Support Node), HLR (HLR: Home Location Register).Wherein satellite communication system, main website adopts TDM system to the forward link of ICBM SHF satellite terminal, and ICBM SHF satellite terminal adopts MF-TDMA system to the return link of main website, connects a local area network (LAN), be used for as the user in local area network (LAN) provides access Packet Service after each ICBM SHF satellite terminal.For 3G equipment of the core network, adopt between SGSN and main website to adopt between Iu interface, SGSN and GGSN to adopt between Gr interface, GGSN and HLR between gn interface, SGSN and HLR and adopt Gc interface, GGSN by connecing internet after Gi interface, by connecing PLMN network after gp interface.ICBM SHF satellite terminal obtains radio channel resource by access main website, set up wireless connections, ICBM SHF satellite terminal is by access 3G core net, carry out authentication, encryption, certification, 3G core net is ICBM SHF satellite terminal distribution service channel, set up service connection, and conversation procedure is controlled, QoS and billing function are provided.
Resource allocation methods of the present invention relates to two parts:
(1) main website forward link part
Main website forward link resources distribution method flow process is illustrated in fig. 2 shown below:
After main website and ICBM SHF satellite terminal successfully set up wireless connections, ICBM SHF satellite terminal enters attaching process, ICBM SHF satellite terminal enters SYNC (synchronously) state, now triggering main website is that each ICBM SHF satellite terminal entering attaching process distributes a less resource (magnitude is a few K bit/s), this less resource is for distributing to the time interval resource in attaching process needed for transmission attachment signaling, this less resource size equals the maximum of all signaling sizes in whole attaching process or is obtained by main website Dynamic Resource Allocation for Multimedia, and happens suddenly planned time transmitting signaling downwards to each ICBM SHF satellite terminal by terminal.
The attachment protocol mapping that forward direction sends by main website is to the one in system three kinds carrying queue, namely carrying maintains the queue Shen that Packet Service connects signaling, maintain in the queue of wireless connections signaling by keeping the protocol mapping of wireless connections to carrying, when main website sends signaling, the dispatching priority of attachment signaling is lower than the dispatching priority maintaining wireless connections signaling, in each transmission cycle, the signaling maintaining wireless connections preferentially obtains time interval resource.After attaching process terminates, ICBM SHF satellite terminal enters attachment state, now trigger main website and will distribute to the less resource repealing of attachment signaling, main website is that ICBM SHF satellite terminal maintains a CRA Resourse Distribute, this CRA resource object keeps a kind of connection status for making system, and resist burst flow, ICBM SHF satellite terminal enters business application process, and main website is that ICBM SHF satellite terminal business application signaling Resources allocation adopts Dynamic Resource Allocation for Multimedia mode.
After to SGSN, ICBM SHF satellite terminal applies for that Packet Service connects, SGSN sends RAB (RAB to main website, Radio Access Bearer) distribute demand signalling as service resources request, main website sets up RAB according to the signaling received, complete RAB configuration, extract relevant QoS configuration information in signaling, QoS configuration information is wherein generated according to application traffic signaling by GGSN, comprises type of service, speed etc.Main website goes out Radio Resource capacity needed for this Packet Service according to the QoS information calculation of parameter extracted, main website carries out access control according to calculating Packet Service resource requirement situation, whether the current network resource conditions of main station judging can meet this service access, if resource is enough, then access access, as deficiency, then notify that described SGSN enters QoS negotiations process and again sends service resources request according to described business application.
QoS negotiations process is, if inadequate resource, main website tells this assignment of SGSN RAB failure by sending RAB distribution response signaling, and this responds in signaling by failure cause parameter read-in, after SGSN receives failed message, the qos requirement of application business will be reduced according to failure cause, initiate new RAB assignment process according to new qos requirement.
After above-mentioned access control, the data received are separated by main website by type, this assorting process realizes by IP filter, by IP filter first by signaling and service detach, signaling is carried by signaling queue, business is carried by service queue, and the Packet Service of different QoS characteristic maps in different carrying queues by IP filter.IP filter is IP five-tuple to the filtration parameter of grouping busihess data: object IP address, source, source destination slogan and protocol type.The corresponding relation of IP five-tuple and QoS of survice characteristic is present in the QoS information that core net transmits to main website.Described signaling queue comprises wireless connections signaling queue for carrying wireless connections signaling between main website and ICBM SHF satellite terminal and connects signaling queue with the Packet Service that the Packet Service for carrying ICBM SHF satellite terminal, between main website with 3G core net is connected signaling, described service queue comprises Packet Service queue, Packet Service queue is not unique in main website, different Packet Service queues has different QoS characteristics, its probability accepting scheduling is different, in order to keep the qos requirement of Packet Service, its dispatching priority is lower than the priority of signaling queue.
In the cycle of transmission each time of main website, the signaling maintaining wireless connections between main website and ICBM SHF satellite terminal is adopted to the strategy of periodic scheduling, and there is the highest dispatching priority, for the signaling maintaining main website, Packet Service between ICBM SHF satellite terminal with core net is connected, will dispatch according to priority order in each dispatching cycle together with Packet Service.
For the signaling and the Packet Service scheduling between the two that maintain Packet Service connection, dispatch according to priority order, wherein Packet Service connects the priority of signaling by the priority higher than all Packet Services, in each dispatching cycle, preferentially will obtain scheduling, real-time dispatching algorithm will be adopted for all Packet Services
When for the signaling in queue and Packet Service Resources allocation, main website will be periodically that the signaling maintaining wireless connections between main website and ICBM SHF satellite terminal distributes time slot, in this cycle, first time interval resource will meet the signaling maintaining wireless connections, after all signalings about wireless connections are sent, be that other signalings and Packet Service distribute time interval resource again, relevant signaling and grouping busihess data is connected for Packet Service, in each transmission cycle of main website, time interval resource about signaling is connected by preferentially meeting Packet Service, when Packet Service connect relevant signaling be sent or at present temporary without this type of signaling time, main website is carried grouping busihess data distribution time interval resource, according to scheduling result between grouping busihess data, and within the transmission cycle, time interval resource is enough, for Packet Service distributes time interval resource, obtain the data composition forward data flow of resource, sent by main website.
ICBM SHF satellite terminal return link part
ICBM SHF satellite terminal return link resource allocation methods flow process is illustrated in fig. 3 shown below:
ICBM SHF satellite terminal enters SYNC (simultaneously) state, namely between main website and ICBM SHF satellite terminal after wireless link, ICBM SHF satellite terminal receives the terminal burst planned time signaling that main website sends, comprising main website in signaling is that each enters the time interval resource for transmitting attachment signaling of the ICBM SHF satellite terminal distribution of attaching process, this resource is one compared with the static resource (magnitude is a few K bit/s) of small time slot, the Resourse Distribute maintaining wireless connections signaling plans acquisition by main website, and obtains from terminal burst planned time signaling.After ICBM SHF satellite terminal completes attaching process, ICBM SHF satellite terminal enters service connection process, ICBM SHF satellite terminal will by resource request signaling to master station acquires resource, ask the resource that obtains to be happened suddenly planned time signaling by main website transmitting terminal, be used for distributing to the signaling setting up service connection, the resource maintaining wireless connections signaling is planned by main website, and equally by terminal burst planned time transmitting signaling downwards.
After Packet Service connection establishment, the data received are sent into the IP filter of ICBM SHF satellite terminal by ICBM SHF satellite terminal, by IP filter first by signaling and service detach, signaling is carried by signaling queue, business is then carried by service queue, and the Packet Service of different QoS characteristic maps in different carrying queues by IP filter, the carrying queue of total three types, namely wireless connections signaling queue, Packet Service queue are connected signaling queue with grouping, send resource request signaling to main website simultaneously.
ICBM SHF satellite terminal is by sending the resource request signaling of carrying resource requirement parameters to main website, request main website is that ICBM SHF satellite terminal distributes time interval resource, resource request scheduling request time interval resource comprises the signalling time slot resource and Packet Service time interval resource that maintain Packet Service connection, the sendout Yao Shi main website current time slots resource allocation conditions of both time interval resources and determining, if this sub-distribution cannot meet the signalling time slot resource of the necessary maintenance wireless connections of ICBM SHF satellite terminal, then this time request enters queuing in main website, redistributes after waiting system setting-up time.If resource meets, main website by the allocation result of resource request signal resource request write terminal burst planned time signaling, and sends it to ICBM SHF satellite terminal, and ICBM SHF satellite terminal extracts the resource parameters obtained after receiving terminal burst planned time signaling.For ICBM SHF satellite terminal signaling resource requirement, plan that ICBM SHF satellite terminal signaling sends required time slot by main website, and program results write in terminal burst planned time signaling,
The scheduling strategy of ICBM SHF satellite terminal to three kinds of queues adopts following method: queue carrying being maintained to wireless connections signaling, is inserted in the signaling moiety of passback burst packets at the delivery time each time of ICBM SHF satellite terminal; Packet Service is maintained for carrying and connects the queue of signaling and the queue of Packet Service, adopt the strategy according to priority dispatched, and inserted in the service part of passback burst packets, wherein maintain the priority of priority higher than Packet Service that Packet Service connects signaling; For the scheduling of Packet Service, real-time dispatching algorithm is adopted to dispatch to the Packet Service of different QoS characteristic.
Real-time dispatching algorithm is when considering qos parameter, quene state parameter, obtain the algorithm of queue scheduling priority, the parameter considered wherein is needed to comprise: the propagation delay time of the average data rate that maximum bit rate, business that business is supported obtain within dispatching cycle, traffic packets queue row first stand-by period, traffic packets and packet loss boundary, before each dispatching cycle, need Integrated comparative above-mentioned parameter, in order to obtain packet service scheduling priority, to reach good dispatching effect and transport service performance.
ICBM SHF satellite terminal passback burst packets is made up of two parts, wherein forward part is used for command transmitting, rear portion is divided into the passed-back traffic burst packets for transport service, in resource allocation, maintain wireless connections signaling and obtain time interval resource according to main website planning, and by it by the part being used for command transmitting in planning write ICBM SHF satellite terminal passback burst packets, the Resourse Distribute obtained by the application of resource request signaling is given in the transmission connecting signaling and Packet Service for maintaining Packet Service, time interval resource will preferentially meet the signaling maintaining Packet Service and connect, and signaling is write the signaling moiety of ICBM SHF satellite terminal passback burst packets, after meeting signaling, by remaining time slots Resourse Distribute to Packet Service, and write in ICBM SHF satellite terminal passed-back traffic burst packets.
In service connection process, main website is the mode that ICBM SHF satellite terminal distributes time interval resource method employing Dynamic Resource Allocation for Multimedia, comprising methods of salary distribution such as CRA (fixed rate distribution), RBDA (dynamic capacity based on speed), VBDC (dynamic capacity based on the traffic), FCA (free capacity distribution), main website, according to the resource request mode of ICBM SHF satellite terminal, adopts one or more methods in aforesaid way to carry out Resourse Distribute.
The satellite communication system that the present invention can be access 3G core net provides efficient and rational resource allocation methods, the resource allocation mechanism of satellite communication is merged mutually with the conversation management control function of core net, the business of satellite communication system carrying ensures parameter according to different QoS, obtain the resource guarantee of different stage, can the transmission of the higher business of effective guarantee real-time and system signaling, the performance and the customer service that improve satellite communication system are experienced.
The unspecified part of the present invention belongs to general knowledge as well known to those skilled in the art.
Claims (8)
1. the resource allocation methods of a satellite communication system, described satellite communication system comprises satellite coupling part and 3G core net, described satellite coupling part comprises ICBM SHF satellite terminal for connecting local area network (LAN), for managing the main website of ICBM SHF satellite terminal, and for realizing the satellite of ICBM SHF satellite terminal and master station communication, described 3G core net comprises SGSN, described SGSN is connected with described main website, it is characterized in that:
(1) described SGSN is according to the business application of the ICBM SHF satellite terminal be attached, and sends service resources request, and proceed to step (2) to main website;
(2) described main website determines the service resources described in business application of the ICBM SHF satellite terminal be attached according to service resources request; If described main website can meet described service resources request, then proceed to step (3), otherwise notify that described SGSN sends service resources request according to described business application again;
(3) described main website receives the data that described SGSN sends according to described service resources; And described data are carried out to separation obtains wireless connections signaling queue, Packet Service queue is connected signaling queue with Packet Service;
(4) described main website is better than Packet Service connection signaling according to wireless connections signaling and is better than the order of Packet Service to described ICBM SHF satellite terminal transmission wireless connections signaling queue, Packet Service queue or Packet Service connection signaling queue.
2. the resource allocation methods of a kind of satellite communication system as claimed in claim 1, is characterized in that: described service resources request distributes demand signalling by described SGSN by RAB and is sent to described main website.
3. the resource allocation methods of a kind of satellite communication system as claimed in claim 1, is characterized in that: described main website determines described service resources according to the QoS information of the type of service of service resources request, service rate and business.
4. the resource allocation methods of a kind of satellite communication system as claimed in claim 1, it is characterized in that: the ICBM SHF satellite terminal be attached is completing before the attachment of described 3G core net, and described 3G core net is made an addition to described Packet Service to the attachment signaling that described ICBM SHF satellite terminal sends and connects in signaling queue by described main website.
5. the resource allocation methods of a kind of satellite communication system as claimed in claim 1, is characterized in that: described main website is that each ICBM SHF satellite terminal be attached maintains one for keeping connection, and resists the static resource of burst flow.
6. in satellite communication system, main website, to a resource allocation methods for ICBM SHF satellite terminal, is characterized in that:
ICBM SHF satellite terminal by with the signaling being used between main website maintaining wireless connections, the grouped data received and be used for maintaining the signaling dividing into groups to be connected between 3G core net and add wireless connections signaling queue, Packet Service queue respectively and divide into groups to connect signaling queue, send resource request signaling to main website simultaneously;
Described main website is according to the resource request signaling determination time interval resource of described ICBM SHF satellite terminal;
The time interval resource that described ICBM SHF satellite terminal is determined according to described main website is connected signaling queue to described main website transmission wireless connections signaling queue, Packet Service queue and grouping;
If described main website cannot determine time interval resource when receiving the resource request signaling of ICBM SHF satellite terminal, then after waiting system setting-up time, again according to described resource request signaling determination time interval resource.
7. in a kind of satellite communication system as claimed in claim 6, main website, to the resource allocation methods of ICBM SHF satellite terminal, is characterized in that: described time interval resource passes through burst planned time signalling to described ICBM SHF satellite terminal by described main website.
8. in a kind of satellite communication system as claimed in claim 6 main website to the resource allocation methods of ICBM SHF satellite terminal, it is characterized in that: described ICBM SHF satellite terminal utilizes passed-back traffic burst packets send wireless connections signaling queue, Packet Service queue to described main website and divide into groups to be connected signaling queue, and wherein wireless connections signaling queue is filled in the signaling moiety of described passed-back traffic burst packets; Described Packet Service queue is connected signaling queue is filled in described passed-back traffic burst packets data division according to the order maintaining the signaling of wireless connections and be better than Packet Service with described grouping.
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