CN100341293C - Time-delay channel distributing method - Google Patents

Abstract

The present invention discloses a time-delay channel distributing method which belongs to the field of communication. The present invention causes a system to reduce total required PHY address resource space, so PHY address resources are effectively utilized, the bandwidth utilization rate is increased, the resource management is simplified, and the price of an ATM-layer device connected to an ADSL plate fin is reduced; thereby, the operating cost and the expense for using multiple time-delay channel business by a user are reduced. The time-delay channel distributing method comprises the following steps: A) a user port of each digital user line access multiplexer is provided with a default time-delay channel, and residual physical layer port resources form a shared port address resource pool; B) when a novel time-delay channel is increased as required, a host machine or a gateway system of the digital user line access multiplexer configures one physical layer address in the shared port address resource pool to a corresponding port of the user, and a corresponding connected relationship and a physical connection parameter are configured for the corresponding port of the user.

Description

Time-delay channel allocation method

Technical field

The present invention relates to the communications field, particularly the distribution technique of time delay passage in the communications field.

Background technology

Along with the explosive growth of internet, also be able to swift and violent popularization in services such as application of the commerce on the internet and multimedias.Enjoy the various services on the internet, the user is access network in some way.In order to realize the digitlization of user access networks, broadband, improve user's networking speed, Fiber to the home (FiberTo The Home, be called for short " FTTH ") be the inevitable direction of user network Future Development, but because the cost of passive photonic loop is too high, most of user networks will continue to use existing copper loops in from now on more than ten years even decades, so people have proposed multinomial cambic broadband access network technology in recent years, comprise integrated services digital network, cable modem (Cable Modem), Asymmetric Digital Subscriber Line (Asymmetric Digital Subscriber Line, be called for short " ADSL ") or the like, wherein ADSL is a kind of of tool prospect and competitiveness, will occupy an leading position in following more than ten years even decades.

Specifically, the ADSL technology is the technology that a kind of asymmetric digital subscriber line is realized the broadband access Internet, ADSL is as a kind of technology of transport layer, make full use of existing copper cash resource, the up 640kbps bandwidth of descending 8Mbps is provided on a pair of twisted-pair feeder, thereby overcome " bottleneck " of legacy user, realized broadband access truly at " last kilometer ".

In order to utilize a plurality of channels, the bandwidth that ADSL Modem (being called for short " ADSL modem ") adopts dual mode to divide utilizable telephone line: frequency division multiplexing (Frequency DivisionMultiplexing is called for short " FDM ") technology or Echo Cancellation technology (Echo Cancellation) technology.The FDM mode is ascender and descender with frequency band division, and down going channel comprises promising one or more high speed Bearer Channel (bearer channel) and several low speed Bearer Channel; Data feedback channel then comprises several low speed Bearer Channels.

ADSL Modem and traditional modulator-demodulator are the same with integrated services digital network (IntegratedServices Digital Network is called for short " ISDN "), also are to use the media of telephone network as transmission.When ADSL Modem has been installed, utilize modern frequency division and coding modulation technique, will produce three information channels on this section telephone wire: pass passage, low speed data feedback channel and common telephone channel at a high speed.These three passages can be worked simultaneously, that is to say that it can obtain maximum data transmission capabilities on existing telephone wire, and both can surf the Net on a telephone wire " surfing " fast can also make a phone call or send fax.

Following simple declaration is the workflow of ADSL once: at first, the signal that telephone wire transmits also is demultiplexer by the filtering separator, if voice signal just passes on the telephone set; If digital signal then is transferred to ADSL Modem, data are just imported in the computer then through conversion, have just received the information on the Internet.

Asynchronous transfer mode (Asynchronous Transfer Mode is called for short " ATM ") framer is finished the user data interface function.User data interface is with the test of ATM physical layer general and operation-interface (Universal Test ﹠amp that receive; Operations PHY Interface for ATM, be called for short " UTOPIA ") or Synchronous Transfer Mode (Synchronous Transfer Mode, abbreviation " STM ") interface data is divided into express passway and interleave channel, perhaps data quick and interleave channel is sent into UTOPIA interface or STM interface.User data interface is divided into receive direction and two parts of sending direction, and sending direction is that the packet of handling is drawn together ATM data (UTOPIA interface), STM data, and it is consisted of the ADSL superframe, and is divided into interleave channel and express passway by in the export-oriented chip of chip; Receive direction is that the data with interleave channel and express passway send by separating conversion such as frame, also is divided into UTOPIA interface data, STM data.

The access model of ADSL mainly contains central exchange office end module and remote end module is formed.Central exchange office end module is included in the ADSL Modem of center and inserts multiplexed system, and the ADSL Modem that is in the center is called as ADSL local side transmission unit (ADSL Transmission Unit-Central is called for short " ATU-C ").Access multiplexed system center Modem is combined into one usually and is known as access node, also is known as Digital Subscriber Line Access Multiplexer (DSL AccessMultiplexer abbreviates " DSLAM " as).Remote end module is made up of user ADSL Modem and filter, and user side ADSL Modem is commonly called ADSL far-end transmission unit (ADSLTransmission Unit-Remote is called for short " ATU-R ").

Broadband access can provide multiple business, is divided into two kinds of real time business and non-real-time services in general.Wherein, real time business than higher, belongs to delay sensitive type business to delay requirement, as speech business, video traffic etc., time delay exceeds standard and can have a strong impact on quality of service, so time delay should strict limit within limits, but to the error rate require relatively low; Non-real-time service does not have special requirement to time delay, but very high to error rate requirement, belongs to time delay non-sensitive type business, for example business such as data transmission service and online.

In order to satisfy above-mentioned requirements, ADSL provides two types time delay passage, express passway (fastpath) and interleave channel (interleaved path).Wherein, still anti-impulse disturbances ability is relatively poor in express passway time-delay little (one-way delay of ADSL is less than 4ms), and interleave channel time delay big (One Way Delay is greater than 20ms), its advantage is that anti-impulse disturbances ability strengthens.Therefore to the real time business of delay sensitive, available express passway is carried, and the error rate is required height, and the insensitive non-real-time service of time delay can carry with interleave channel.For example, the standard of ADSL G.992.1 in an ADSL connect above-mentioned two time delay passages can be provided simultaneously, and each bar connects 4 different time delay passages can be provided simultaneously in ADSL2 (G.992.3), ADSL2+ (G.992.5).

In Digital Subscriber Line Access Multiplexer (Digital Subscriber Line Access Multiplexer is called for short " DSLAM ") equipment, physical layer (Physical is called for short " PHY ") device ADSL chip and ATM layer device are by the utopia bus interface.Each time-delay passage is equivalent to a PHY port, needs a PHY address, prolongs passage for a long time in order to provide, and needs to support more PHY address resource.

At present, in broadband services, system is that each passage static state of prolonging channel service for a long time of user applies is all distributed a PHY address resource.

In actual applications, there is following problem in such scheme: the waste of PHY address resource, resource can not be utilized effectively, passage is prolonged in static support for a long time makes UTOPIA PHY address space enlarge, corresponding address poll, route resource, buffer queue and complicated to its management, scheduling, and efficient reduction cause complex managementization; Bandwidth availability ratio reduces, and causes simultaneously costing an arm and a leg with the ATM layer device of ADSL nest plate interface, has increased operation cost and user and has used the expense of prolonging channel service for a long time.

Cause the main cause of this situation to be, system is that each of user applies prolonged PHY address of passage static allocation for a long time, the user that passage is prolonged in i.e. application for a long time occupies a plurality of PHY address resources simultaneously, and most of users as a rule, only need a kind of time delay passage, remaining prolongs port for a long time and is in idle state.

Summary of the invention

In view of this, main purpose of the present invention is to provide a kind of time-delay channel allocation method, and the system that makes can dwindle needed total PHY address resource space, effectively utilizes the PHY address resource, improves bandwidth availability ratio.

For achieving the above object, the invention provides a kind of time-delay channel allocation method, comprise following steps:

A is default time-delay passage of each Digital Subscriber Line Access Multiplexer user port configuration, and constitutes the port address resource pool of sharing by remaining physical layer port resource;

B is when the new time-delay of needs increase passage, Digital Subscriber Line Access Multiplexer main frame or network management system dispose a physical layer address in the described shared port address resource pool to described user's corresponding port, and dispose corresponding annexation and physical connection parameters for it.

Wherein, in the described steps A, described default time-delay passage is interleave channel or express passway or second generation ADSL (Asymmetric Digital Subscriber Line) passage.

In described step B, when needs increase described new time-delay passage, also comprise the described default time-delay passage of described user by having connected, to newly the delay time step of passage of Digital Subscriber Line Access Multiplexer main frame or network management system application, VPI/VCI the value that comprises new time-delay passage in the wherein said solicitation message, and to the requirement of time delay.

Described method also comprises following steps:

C starts port arrangement new among the described step B, makes the new time-delay passage of described port support.

Described method also comprises following steps:

Described Digital Subscriber Line Access Multiplexer main frame of D or network management system are after described user closes described new time-delay passage or rolls off the production line, and deletion connects, and described physical layer address is discharged back described shared port address resource pool.

Before described step D, also comprise described user takies described new time-delay passage to Digital Subscriber Line Access Multiplexer main frame or network management system application cancellation step.

By relatively finding, technical scheme difference with the prior art of the present invention is, the process user of system dynamics prolong channel request for a long time, just dynamic assignment port money address resource is given the user when the user needs, different user can be shared the resource in the PHY address resource pond, therefore reduce the address resource space, can use more cheap and ATM layer device ADSL nest plate interface.

Difference on this technical scheme, brought comparatively significantly beneficial effect, be that the needed total PHY address resource space of system dwindles, effectively utilized the PHY address resource, improved bandwidth availability ratio, simplified resource management, reduced operation cost and user and used the expense of prolonging channel service for a long time.

Description of drawings

Fig. 1 is the ADSL broadband access model among the present invention;

Fig. 2 is a kind of method flow diagram of supporting the multiple-time delay passage according to an embodiment of the invention;

Fig. 3 is that system provides and prolongs the channel service schematic diagram for a long time according to an embodiment of the invention.

Embodiment

For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.

Fig. 1 shows the model of ADSL broadband access among the present invention.

The access model of ADSL mainly contains central local side module and remote end module is formed.

For realizing function of the present invention, the ADSL broadband access must be expanded network management function in central local side module, or increases network management function, is used to manage the port address resource pool of sharing of PHY, and realizes the dynamic assignment that ADSL prolongs port for a long time.Digital Subscriber Line is connected with the internet by the ATM device.

Webmaster or host function are finished the management work in shared resource pond.It is each address resource operating position of the shared port address resource pool of network management system record, receive the user the second time delay passage take application, and cancellation takies application, carry out the distribution and the configuring ports of resource according to user's demand, take when application receiving that the user cancels, deletion connects, and discharges resource.

Shown in Fig. 3 is that system according to an embodiment of the invention provides and prolongs the channel service schematic diagram for a long time.System is made up of three parts, User Part 10, DSLAM part 20 and webmaster part 30.User 10 applies for new time delay passage by step M to gateway 30; Gateway 20 sends the order of configuration DSLAM to DSLAM part 30 by step P; Use the time delay passage of this new application as user 10 after, close this passage, take to webmaster 30 application cancellations by DSLAM20, the resource of release busy, webmaster 30 is recovered to resource in the shared resource pond.

Below with reference to Fig. 2, describe the method flow that passage is prolonged in support according to an embodiment of the invention for a long time in detail.This method is used for the distribution of prolonging passage for a long time of ADSL broadband access.

At first, in step 100, under default situation, network management system distributes a time delay passage commonly used for each user.It may be noted that those of ordinary skill in the art know, default passage can be selected according to the actual needs of oneself by each user.Usually can be used for data services such as the user surfs the Net with interleave channel as default passage.If certain user often uses is the business of the professional or time delay passage that other system supports that provides of express passway, also this passage can be made as this user's default passage.In system for after each user the distributes default time delay passage, can be with remaining PHY port resource as shared resource.For example, in according to one embodiment of present invention, it is the adsl interface plate of the DSLAM of 1 24 port, the ability of ATM device is supported 32 PHY addresses for multipotency, average like this each user that gets off can support 1 time delay passage at most, all users' of support ADSL two time delay passages or the four time delay passages of ADSL2 are then not enough, support two time delay passages, two ways are arranged, one is above-mentioned, by change ATM device,, also have a way to adopt the solution of the present invention exactly such as with the ATM device that can support 64 PHY addresses.With remaining 8 PHY address resources as be used for second and third, the shared resource pond of four time delay passages, distribute to the user who needs.

Then, in step 110, network management system judges whether to receive the request of user applies second service channel.If do not receive, continue to wait for.If receive request, then enter step 120, user's request is handled.Need to prove that under the default situation, each user port distributes a PHY address, is used for the most frequently used time delay passage, guarantee that the first time delay channel service of user applies at first moves, remaining address is deposited in the shared port address resource pool.If the user has the demand of the second time delay channel service, default time delay passage then by having connected, initiate request from terminal, need to comprise this user's VPI (Virtual ChannelIdentifier in the information requested, be called for short " VCI ")/VCI (Virtual Path Identifier, be called for short " VPI "), and to the requirement of time delay.Specifically, for ADSL, be exactly quick mode or interlace mode, for ADSL2 and ADSL2+, other pattern is arranged then, and port information is by DSLAM main frame or webmaster identification.Generally speaking, the user only uses wherein a kind of time delay channel service, and by the inventive method, the user needn't also account for resource when not needing certain professional.Each user can obtain the right to use of resource when needed by the mode of sharing.In this way, can support the adsl interface plate of DSLAM of 24 ports of 24 users, prolong channel service for a long time if want to allow each user use, needn't necessarily need the ATM device of supporting 24 * n (n is the number of time delay channel service) individual PHY address, and can be for example said in above situation, support the ATM device of 32 PHY address resources just can meet the demands.Can reduce the ATM layer device price with ADSL nest plate interface like this, thereby cut operating costs, simultaneously since the resource of a plurality of users in can the shared address resource pool therefore reduced each user and used the expense of prolonging channel service for a long time.Because in the present invention, needed PHY address space can farthest dwindle, corresponding address poll, route resource, buffer queue and can simplify its management, scheduling, the utilance of resource is improved, and the treatment effeciency of system also can improve.

In step 120, because the network management system request of having received user applies second service channel as mentioned above, the channel allocation processing unit is the required physical layer channel of distributing user from above-mentioned shared port address resource pool, configures the value of VCI/VPI, and enables new port arrangement.This moment, this port was supported new time delay passage on original basis, and this user just can use this new tunnel like this.For ADSL, owing to relate to the variation of ADSL content frame, possible this port need reconnect, and for ADSL2, can realize by dynamic recognition.Can realize the configuration of PHY address resource also realizing automatically by network management configuration by the operator by software.

Then enter step 130, when the user uses this business, take, close this connection to network management system application cancellation.

After this, in step 140, receive when network management system that the user cancels and take when application, just delete this connection, regain the physical layer address resource, it is discharged in the shared port address resource pool.At this moment, the resource of this user's release just can be reused by same mode by other users.In this way, resource has obtained utilizing to greatest extent, and bandwidth availability ratio is improved.

System can both support dynamic assignment time delay passage method, also supported static time delay channel allocation method.Passage of all default use when being each user applies ADSL, but provide the selection of prolonging passage for a long time, for the user that the second channel requirement is arranged, require to give this user to dispose two PHY addresses according to it, two permanent virtual circuits (Permanent Virtual Circuit is called for short " PVC "), such as for ADSL,, an express passway, an interleave channel, and can charged extra for this requirement.

Though by reference some preferred embodiment of the present invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that, can do various changes to it in the form and details, and the spirit and scope of the present invention that do not depart from appended claims and limited.

Claims (6)

1. a time-delay channel allocation method is characterized in that, comprises following steps:

A is default time-delay passage of each Digital Subscriber Line Access Multiplexer user port configuration, and constitutes the port address resource pool of sharing by remaining physical layer port resource;

B is when the new time-delay of needs increase passage, Digital Subscriber Line Access Multiplexer main frame or network management system dispose a physical layer address in the described shared port address resource pool to described user's corresponding port, and dispose corresponding annexation and physical connection parameters for it.

2. time-delay channel allocation method according to claim 1 is characterized in that, in the described steps A, described default time-delay passage is interleave channel or express passway or second generation ADSL (Asymmetric Digital Subscriber Line) passage.

3. time-delay channel allocation method according to claim 1, it is characterized in that, in described step B, when needs increase described new time-delay passage, also comprise the described default time-delay passage of described user by having connected, to newly the delay time step of passage of Digital Subscriber Line Access Multiplexer main frame or network management system application, comprise the VPI/VCI value of new time-delay passage in the wherein said solicitation message, and to the requirement of time delay.

4. time-delay channel allocation method according to claim 1 is characterized in that described method also comprises following steps:

C starts port arrangement new among the described step B, makes the new time-delay passage of described port support.

5. time-delay channel allocation method according to claim 1 is characterized in that described method also comprises following steps:

Described Digital Subscriber Line Access Multiplexer main frame of D or network management system are after described user closes described new time-delay passage or rolls off the production line, and deletion connects, and described physical layer address is discharged back described shared port address resource pool.

6. time-delay channel allocation method according to claim 5 is characterized in that, before described step D, also comprises described user takies described new time-delay passage to Digital Subscriber Line Access Multiplexer main frame or network management system application cancellation step.

Images