CN101068227B - System for protecting QoS system based on family gateway and reservation band width technique and method thereof - Google Patents
System for protecting QoS system based on family gateway and reservation band width technique and method thereof Download PDFInfo
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- CN101068227B CN101068227B CN2007100283937A CN200710028393A CN101068227B CN 101068227 B CN101068227 B CN 101068227B CN 2007100283937 A CN2007100283937 A CN 2007100283937A CN 200710028393 A CN200710028393 A CN 200710028393A CN 101068227 B CN101068227 B CN 101068227B
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Abstract
A system used for ensuring QoS based on home gateway and reserved bandwidth technique comprises service terminal, home gateway, router, digital user access server and wideband access unit. It is featured as setting bandwidth reserved unit and service-type identifier on home gateway, connecting bandwidth reserved unit to service-type identifier then connecting said bandwidth reserved unit to router and connecting service-type identifier to various service terminals. Its ensuring method is also disclosed.
Description
Technical field
The present invention relates to a kind of network information mechanics of communication, relate in particular to a kind of based on home gateway and reservation band width technique to ensure system and the method thereof of QoS.
Background technology
Increase along with the broadband user, broadband-based integrated home business begins to go deep into actual life, as the data service of PC (PC) online, the voice VoIP business that digital telephone (IP Phone) provides, the BTV/VoD business that top box of digital machine (IP STB) provides, the visual telephone business that visual telephone (Video Phone) provides etc.And gateway is broadband services and inter-household tie as the tie point of internal lan and external telecommunications network.Home gateway is forwarded to home network inside with the business of external network with the management request, also is provided to the connection of operation system for the home network internal unit; Be connected to business platform as termination equipment, for the domestic consumer provides various broadband services.Along with going deep into of family network service, in home gateway, reasonably distribute required bandwidth for miscellaneous service, be a kind of embodiment that ensures each service terminal QoS in the home network.
At present, the RSVP RSVP (ReSource reserVation Protocol) that has adopted integrated service IntServ (Integrated Services) to propose, promptly before transmitting data, set up session path earlier and reserve required resource, distribute with the reservation that realizes bandwidth resources.And when carrying out resource reservation, adopted the mode of multicast tree, promptly transmitting terminal sends the PATH message to all receiving terminals and indicate the characteristic of the traffic.Therefore, the router in the middle of each all will be transmitted the PATH message, and receiving terminal then responds with the RESV message.And when request was received, link bandwidth and spatial cache just were assigned to this stream of packets, and relevant flow state information just is retained in the router.Like this, when using RSVP application resource reservation, each professional state information need be kept in advance by the mode of setting up session path earlier on the way each router, has therefore just increased the storage overhead of router.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, provide a kind of and can provide required bandwidth for each business neatly, need not to increase the storage overhead of router, can satisfy each service terminal real-time demand based on home gateway and reservation band width technique to ensure the system of QoS.Another object of the present invention is to provide a kind of based on home gateway and reservation band width technique to ensure the method for QoS.
Purpose of the present invention is achieved by the following technical programs:
Provided by the invention a kind of based on home gateway and reservation band width technique to ensure the system of QoS, comprising: service terminal, home gateway, router, digital subscriber access server and broadband access system; Described home gateway has that to be used for according to type of service be the RSVP device of professional bandwidth reserved, and the type of service identifier that is used for type of service under the recognition data message; Described RSVP device links to each other with the type of service identifier, and wherein the RSVP device is also connected to described router, and the type of service identifier is also connected to each service terminal.
The present invention also can take following further measure: described type of service identifier comprises following composition:
Discriminating device-be used to receive the data message of service terminal extracts the diffserv field DS in the data message, tells this service according to this field area and belongs to which kind of type, and write the type identification of this service of mark;
The qos parameter item that qos parameter table-be used to provides corresponding with type of service, this qos parameter item comprises the bandwidth and the priority of corresponding types business;
Search device-be used for and pass the type identification of coming according to discriminating device and search the Qos parameter list, and send the RSVP device to;
Described RSVP device comprises following composition:
Priority discrimination device-when receiving a plurality of qos parameter item, be used for the priority of each parameter item is compared, thereby draw the highest Business Stream of priority level; Wherein include a stack and a discriminating gear of depositing terminal service stream qos parameter item;
Allocated bandwidth device-be used to the traffic flow assignment bandwidth reserved, and utilize the path forwarding algorithm that drives in the wrong direction to realize the multicast route by generating tree, obligate information is passed up to professional transmit leg along generating tree;
Bandwidth in the described Business Stream qos parameter item sends the allocated bandwidth device to by the discriminating gear in the priority discrimination device.
System of the present invention, leaves in the type of service identifier according to type parameter informations such as each professional needed bandwidth and priority in advance by set up RSVP device and type of service identifier in home gateway, rather than each router on the way.Each router on the way then passed to qos parameter information by the RSVP device, and router is not stored these parameter informations.
Another object of the present invention is achieved by the following technical programs:
Provided by the invention a kind of based on home gateway and reservation band width technique to ensure the method for QoS, the home gateway that adopts has that to be used for according to type of service be the RSVP device of professional bandwidth reserved, and the type of service identifier that is used to discern type of service under the message; May further comprise the steps:
A) the type of service identifier of service terminal in home gateway in the home network sends datagram;
B) type of service identifier receiving data packets, discriminating device are wherein distinguished this service according to the diffserv field DS in the data message (Differentiated Services) and are belonged to which kind of type; Diffserv field DS in the datagram must write the service mark coding of this COS of mark; Then the sign of COS is passed to the device of searching in the type of service identifier;
C) device of searching in the type of service identifier is searched qos parameter table in the type of service identifier according to COS, find the qos parameter item that is complementary with type of service, and the qos parameter item sent to the RSVP device, this qos parameter item comprises the bandwidth and the priority level of corresponding types business;
D) the priority discrimination device in the RSVP device goes out the highest Business Stream of priority according to the priority discrimination in each Business Stream qos parameter, and is professional application bandwidth reserved; The business that priority level is high is assigned to bandwidth earlier, and bandwidth is distributed in the professional back that priority level is low, the identical principle of then distributing earlier according to first to file of priority level;
E) the allocated bandwidth device in the RSVP device generates obligate information according to the qos parameter that the type of service identifier sends over, and utilize the inverse path forwarding algorithm to realize the multicast route by generating tree, obligate information is passed up to professional transmit leg along generating tree; Utilize the path forwarding algorithm that drives in the wrong direction, this information is transmitted to transmit leg; In each jumping on the way, router can be seen this reservation requirement, and reserves necessary bandwidth; If enough bandwidth are arranged, the step below then continuing; If bandwidth is not enough, it back reports failure, and sends message to the type of service identifier again, forwards step b) to;
F) when this reserving message arrives transmit leg, one curb and is generated tree and reserved bandwidth and finish and be business application bandwidth reserved from the transmit leg to recipient.
The present invention has following beneficial effect:
1) parameter informations such as each professional bandwidth and priority level are to leave in advance in the type of service identifier of home gateway according to type, rather than in each router on the way.In addition, the qos parameter that RSVP device handle receives is passed to each router on the way, but router is not stored these parameter informations.Therefore, solved among the art methods RSVP, must in router, set up the deficiency that the station table causes the routing table storage overhead to increase thereby set up session path.
2) router is reserved certain bandwidth according to parameter for this business, and realizes the multicast route by generating tree.Solved among the art methods RSVP, the router in the middle of each all will be transmitted the problem that the router stores expense that mode caused of this multicast tree of PATH message increases.
3) when multinomial business is applied for reserved resource simultaneously, device is reserved in the broadband, and which professional application reserved resource decision is earlier according to the priority in the qos parameter, thereby has satisfied each professional real-time demand.
Description of drawings
The present invention is described in further detail below in conjunction with embodiment and accompanying drawing:
Fig. 1 is the structural principle block diagram of the embodiment of the invention;
Fig. 2 is the structural principle block diagram of type of service identifier in the embodiment of the invention;
The structural principle block diagram of RSVP device in Fig. 3 embodiment of the invention;
Fig. 4 is the workflow block diagram of the embodiment of the invention.
Embodiment
Fig. 1～Figure 4 shows that embodiments of the invention.Present embodiment a kind of based on home gateway and reservation band width technique to ensure the system of QoS, comprising: service terminal, home gateway (HGW), router, digital subscriber access server and broadband access system (BAS, BroadAccess System).Service terminal mainly comprises: set-top box (STB), Digital Television (IPTV), video telephone (Video Phone), digital telephone (IP Phone) and PC (PC) etc.Type of service mainly comprises: do not need the data service (as PC) of QoS guarantee and the business (as the P of V class business, IPTV and Video Phone business) that needs QoS to ensure.
Home gateway (HGW) has that to be used for according to type of service be the RSVP device of professional bandwidth reserved, and the type of service identifier that is used for type of service under the recognition data message.The RSVP device links to each other with the type of service identifier, and wherein the RSVP device is also connected to router, and the type of service identifier is also connected to each service terminal.
As shown in Figure 2, the type of service identifier specifically comprises following composition:
Discriminating device-be used to receive the data message of service terminal extracts the diffserv field DS (Differentiated Services) in the data message, tells this service according to this field area and belongs to which kind of type, and write the type identification of this service of mark.
Qos parameter table-be solidificated in the type of service identifier, all corresponding qos parameter item of each type of service in table, the qos parameter item comprises the bandwidth of corresponding types business and priority level that should business, and bandwidth and priority level are by service provider (Service Provider, SP) network decision.
Search device-be used for and pass the type identification of coming according to discriminating device and search the Qos parameter list, and send the RSVP device to.
The RSVP device receives the qos parameter that the type of service identifier sends over, and reserves certain bandwidth to the service provider network application for this business according to parameter.Then connect, connect the PVC service (Permanent Type Circuit) that provides.
As shown in Figure 3, the RSVP device comprises following composition:
Priority discrimination device-include one to deposit the stack of terminal service stream qos parameter item, a discriminating gear.When receiving a plurality of qos parameter item, these parameter items deposit in the stack earlier.Discriminating gear is used for the priority in each parameter item of stack is compared, thereby draws the highest Business Stream of priority level.
Allocated bandwidth device-be used to the traffic flow assignment bandwidth reserved, and utilize the path forwarding algorithm that drives in the wrong direction to realize the multicast route by generating tree, obligate information is passed up to professional transmit leg along generating tree.
Wherein the bandwidth in the Business Stream Qos parameter item sends the allocated bandwidth device to by the discriminating gear in the priority discrimination device.
The thought of above-mentioned inverse path forwarding algorithm is: when router has received the multileaving grouping, only when grouping be link the shortest path from this router to transmit leg when arriving, router just sends to grouping on all output links link of this grouping (receive except).Otherwise router can abandon this grouping simply, does not send it on any output link.It because knowing on own link in the shortest path of transmit leg, router whether will receive the copy that has still received a grouping, so can abandon certain grouping.
The allocated bandwidth device at first produces the generation tree of this network according to the network of Business Stream provider, then, send bandwidth reserved information.On the way each is jumped execution inverse path forwarding algorithm and is realized the multicast route then.Each jumper connection receives that the information of bandwidth reserved just reserves certain bandwidth, passes up to professional transmit leg always.
As shown in Figure 4, present embodiment, may further comprise the steps to ensure the method for QoS based on home gateway and reservation band width technique:
A) the type of service identifier of service terminal in home gateway in the home network sends datagram; Must be connected this professional terminal of operation with the type of service identifier if open a new business, and send datagram to the type of service identifier.
B) type of service identifier receiving data packets, discriminating device are wherein distinguished this service according to the diffserv field DS in the data message (Differentiated Services) and are belonged to which kind of type; Diffserv field DS in the datagram must write the service mark coding of this COS of mark.Then the sign of COS is passed to the device of searching in the type of service identifier.
C) device of searching in the type of service identifier is searched qos parameter table in the type of service identifier according to COS, find the qos parameter item that is complementary with type of service, and the qos parameter item sent to the RSVP device, this qos parameter item comprises the bandwidth and the priority level of corresponding types business.Required bandwidth and priority level are stipulated by service provider SP.The service provider can stipulate the bandwidth that each business takies according to the experience of the bandwidth occupancy situation of grasping, and comes the priority level of regulation business according to the real-time of business.
D) the priority discrimination device in the RSVP device goes out the highest Business Stream of priority according to the priority discrimination in each Business Stream qos parameter in the stack, and is professional application bandwidth reserved.The business that priority level is high is assigned to bandwidth earlier, and bandwidth is distributed in the professional back that priority level is low, the identical principle of then distributing earlier according to first to file of priority level.
E) the allocated bandwidth device in the RSVP device generates obligate information according to the qos parameter that the type of service identifier sends over, and utilize the inverse path forwarding algorithm to realize the multicast route by generating tree, obligate information is passed up to professional transmit leg along generating tree.Utilize the path forwarding algorithm that drives in the wrong direction, this information is transmitted to transmit leg.In each jumping on the way, router can be seen this reservation requirement, and reserves necessary bandwidth.If enough bandwidth are arranged, the step below then continuing; If bandwidth is not enough, it back reports failure, and sends message to the type of service identifier again, forwards step b) to.
F) when this reserving message arrives transmit leg, one curb and is generated tree and reserved bandwidth and finish and be business application bandwidth reserved from the transmit leg to recipient.
For example, the service conditions that in Fig. 1, sends, receives and transmit is as shown in table 1.
The service conditions that table 1 sends, receives and transmit
Channel that leads to main frame 1 of terminal 3 requests now is in order to receive professional A.In case this channel is established, then 1 stream of packets will can not occur congested again from terminal 3 to main frame.If simultaneously, terminal 5 one of request are led to the channel of main frame 3 in order to receive professional C, and this moment, it also asked reserved resource.At first to family's gateway special bandwidth is arranged all respectively, do not have the saying of bandwidth reserved this moment from terminal 3, terminal 5.Then the type of service identifier in the home gateway is received the data message of professional A, professional C, and distinguish two business according to the diffserv field DS (Differentiated Services) in these two data messages and belong to which kind of type respectively, search the qos parameter table, find out each professional priority level and bandwidth and pass to the RSVP device.Because the priority of professional A is higher than professional B, so the RSVP device preferentially spreads out of the qos parameter of professional A.Then, each jumping during the RSVP device in the home gateway is passed to qos parameter on the way according to the inverse path forwarding algorithm, router is seen this reservation requirement, and reserves necessary bandwidth.Then, the RSVP device spreads out of the qos parameter of professional C again, and router is seen this reservation requirement on the way, is that it reserves necessary bandwidth.
Claims (2)
- One kind based on home gateway and reservation band width technique to ensure the system of QoS, comprise: service terminal, home gateway, router, digital subscriber access server and broadband access system, it is characterized in that: described home gateway has that to be used for according to type of service be the RSVP device of professional bandwidth reserved, and the type of service identifier that is used for type of service under the recognition data message; Described RSVP device links to each other with the type of service identifier, and wherein the RSVP device is also connected to described router, and the type of service identifier is also connected to each service terminal, wherein:Described type of service identifier comprises following composition:Discriminating device-be used to receive the data message of service terminal extracts the diffserv field DS in the data message, tells this service according to this field area and belongs to which kind of type, and write the type identification of this service of mark;The qos parameter item that qos parameter table-be used to provides corresponding with type of service, this qos parameter item comprises the bandwidth and the priority of corresponding types business;Search device-be used for and pass the type identification of coming according to discriminating device and search the qos parameter table, and send the RSVP device to;Described RSVP device comprises following composition:Priority discrimination device-when receiving a plurality of qos parameter item, be used for the priority of each parameter item is compared, thereby draw the highest Business Stream of priority level; Wherein include a stack and a discriminating gear of depositing terminal service stream qos parameter item;Allocated bandwidth device-be used to the traffic flow assignment bandwidth reserved, and utilize the path forwarding algorithm that drives in the wrong direction to realize the multicast route by generating tree, obligate information is passed up to professional transmit leg along generating tree;Bandwidth in the described Business Stream qos parameter item sends the allocated bandwidth device to by the discriminating gear in the priority discrimination device.
- One kind based on home gateway and reservation band width technique to ensure the method for QoS, it is characterized in that: the home gateway of employing has that to be used for according to type of service be the RSVP device of professional bandwidth reserved, and the type of service identifier that is used to discern type of service under the message; May further comprise the steps:A) the type of service identifier of service terminal in home gateway in the home network sends datagram;B) type of service identifier receiving data packets, discriminating device are wherein distinguished this service according to the diffserv field DS in the data message and are belonged to which kind of type; Diffserv field DS in the datagram must write the service mark coding of this COS of mark; Then the sign of COS is passed to the device of searching in the type of service identifier;C) device of searching in the type of service identifier is searched qos parameter table in the type of service identifier according to COS, find the qos parameter item that is complementary with type of service, and the qos parameter item sent to the RSVP device, this qos parameter item comprises the bandwidth and the priority level of corresponding types business;D) the priority discrimination device in the RSVP device goes out the highest Business Stream of priority according to the priority discrimination in each Business Stream qos parameter, and is professional application bandwidth reserved;E) the allocated bandwidth device in the RSVP device generates obligate information according to the qos parameter that the type of service identifier sends over, and utilize the inverse path forwarding algorithm to realize the multicast route by generating tree, obligate information is passed up to professional transmit leg along generating tree; Utilize the path forwarding algorithm that drives in the wrong direction, this information is transmitted to transmit leg; In each jumping on the way, router can be seen this reservation requirement, and reserves necessary bandwidth; If enough bandwidth are arranged, the step below then continuing; If bandwidth is not enough, it back reports failure, and sends message to the type of service identifier again, forwards step b) to;F) when this reserving message arrives transmit leg, one curb and is generated tree and reserved bandwidth and finish and be business application bandwidth reserved from the transmit leg to recipient.
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