CN101227416A - Method for distributing link bandwidth in communication network - Google Patents
Method for distributing link bandwidth in communication network Download PDFInfo
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- CN101227416A CN101227416A CNA2008100659032A CN200810065903A CN101227416A CN 101227416 A CN101227416 A CN 101227416A CN A2008100659032 A CNA2008100659032 A CN A2008100659032A CN 200810065903 A CN200810065903 A CN 200810065903A CN 101227416 A CN101227416 A CN 101227416A
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Abstract
The invention discloses a link circuit distribution method in a communication network, which comprises comparing the size of residual bandwidth and request bandwidth of existing service to distribute bandwidth of link circuit according to residual bandwidth of the existing link circuit after link circuit which can do bandwidth distribution is chosen, wherein the steps of calculating residual bandwidth of existing link circuit comprises utilizing total bandwidth to subtract occupancy bandwidth of optimum grades which are not lower than existing service request on existing link circuit. Since the invention distributes link circuit bandwidth in communication network according to optimum grade information of service request, which utilizes the occupancy bandwidth of optimum grades which are not lower than existing service request on existing link circuit and is subtracted by the total bandwidth to be existing bandwidth to distribute, link circuit bandwidth in communication network is firstly distributed to services whose optimum is higher, the bandwidth firstly tries to be distributed to important and urgent service requests whose optimum grades are higher, and the utilization ratio of bandwidth is higher.
Description
Technical field
The present invention relates to the bandwidth management techniques in the communications field, in particular, relate to link bandwidth allocation methods in a kind of communication network.
Background technology
In communication network,, often need specific assigned part bandwidth for supporting the foundation of link.With the link bandwidth assignment in the CDMA mobile communcations system is example: to all concrete callings of institute's supporting business, cdma base station system all must distribute corresponding base station controller (Base StationController, abbreviate BSC as) and base station transceiver (Base Transceiver System, abbreviate BTS as) between base station controller and base station transceiver interface (Abis Interface-theinterface of BSC--BTS, abbreviate the ABIS mouth as) link part bandwidth, with the foundation of support call link.
Existing method to link bandwidth assignment in the communication network usually is: according to the priority time of service request, the allocated bandwidth situation of current link is inquired about, if the bandwidth that the remaining bandwidth of link distributes less than request is then distributed failure.This distribution method is that the sequencing according to the request of business distributes fully, because in communication network, the priority level of service request is different, such distribution method often makes some important and urgent, and the bandwidth of the service request that priority level is higher can not be distributed timely, and some are less important, not urgent, the service request that priority level is lower is because its request time has early taken massive band width on the contrary; Even the lower business of some priority level is to depend on the higher business of above-mentioned priority level, and these professional because its request times early after having taken massive band width, are waited for finishing of business that the priority level of its dependence is higher; And if this moment, the business that priority level is higher is because request time is later, and request distributes the bandwidth failure, waits for distributing when bandwidth is enough next time again; This just causes that enough link bandwidths are obviously arranged, and but fails to be assigned to bandwidth because of its initial business, but can not finish behind the follow-up business occupied bandwidth, has influence on the communication efficiency of whole communication network.
Owing to do not have good bandwidth allocation methods between the link yet, this just causes close-packed while of link of having, also has the lower link of some utilization rates, and the load between each link is unbalanced, can not make full use of the bandwidth resources of each link, the utilance of the bandwidth resources of whole link is lower.Because the capacity of former cdma base station system is less, ABIS mouth link bandwidth is abundant relatively, the problem that load between each link is unbalanced, the utilance of bandwidth resources is lower is not outstanding, but along with the capacity of cdma base station system enlarges rapidly, it is more and more nervous that abundant in the past ABIS mouth link bandwidth seems, therefore, how to strengthen to ABIS mouth link bandwidth dispatching management, the bandwidth of link is carried out more rational distribution, is just seemed more and more important and urgent.
In addition, because other new access standard is (as satellite removing the E1 connection in the ABIS mouth link, Ethernet, optical fiber communication or microwave communication etc.) reach its maturity and application more and more widely, and the distribution of the link bandwidth of different link standards is carried out separately, the still not good now method of distributing unitedly to ABIS mouth link bandwidth under the multiple link standard concurrent conditions.
Summary of the invention
For overcoming above-mentioned defective, technical problem to be solved by this invention provides link bandwidth allocation methods in the higher communication network of a kind of utilance of bandwidth resources.
The objective of the invention is to be achieved through the following technical solutions:
Link bandwidth allocation methods in a kind of communication network may further comprise the steps:
A: select the current link that carries out allocated bandwidth;
B: according to the remaining bandwidth of current link, relatively the size of the bandwidth on demand of remaining bandwidth and current business is distributed link bandwidth: if remaining bandwidth more than or equal to bandwidth on demand, is a current business request for allocation bandwidth at current link then, be allocated successfully; Otherwise, return professional information of failing in the allocated bandwidth of current link;
Wherein: among the described step B, the step of calculating the remaining bandwidth of current link is: total bandwidth deducts the occupied bandwidth that priority levels all on the current link is not less than the priority level of current business request.
May further comprise the steps in the described steps A:
A1: judge whether the current business request has the demand that given link distributes bandwidth: if then directly carry out step B; If not, execution in step A2 then;
A2: travel through all links in the current system, calculate the remaining bandwidth of each link, selecting the link of current residual bandwidth maximum is current link.
In the described steps A 2, the process that all current links are traveled through may further comprise the steps: all links of the current service sub-system of traversal current business request, calculate remaining bandwidth, and select the link of remaining bandwidth maximum;
Accordingly, among the described step B, after current link bandwidth is distributed, if the allocated bandwidth of current link is failed, then travel through all links of other identical service sub-system of all functions, calculate the remaining bandwidth on each link, in the link of remaining bandwidth maximum, carry out sub-distribution again, if remaining bandwidth satisfies business demand on the link of remaining bandwidth maximum, then is current business request for allocation bandwidth, be allocated successfully; If still can not satisfy business demand, then return professional information of failing in the allocated bandwidth of current link.
The logical links of link in the described steps A for being mapped to by physical link.Many physical links can be mapped to a logical links, also a physical link can be mapped to many logical links, mapping ruler can be set according to the concrete condition of physical link.
Described standard with logical links corresponding physical link is that E1 is connected one or more in link, satellite connection link, Ethernet connection link, optical fiber physical link or the microwave physical link.The physical link of various standards is mapped to the design of one or more logical links, makes us carry out the branch timing to link bandwidth, physical link that can compatible different systems carries out allocation manager to the distributing uniform of the link bandwidth of different link standards.
The step of described calculating remaining bandwidth, record the logical links Bandwidth Management table of the bandwidth information that the business of the total bandwidth of current logical links and each priority level distributed by inquiry after, calculate again.Write down and inquire about by the distribution condition of logical links Bandwidth Management table, each priority level has been distributed the inquiry, record, convenient of bandwidth the calculating of the remaining bandwidth of current business to bandwidth.
Described logical links Bandwidth Management table comprises at least one data item, and each data item is corresponding with each logical links respectively; Wherein, comprise following data field in each data item: link total bandwidth available and corresponding with each priority level respectively occupied bandwidth; After the success of the allocated bandwidth of service request, the bandwidth value of the current priority level that is allocated successfully on this link is added up in the occupied bandwidth value of into original priority level correspondence, more corresponding data field in the new data item.
The total bandwidth of the real physical links that the total bandwidth of described logical links and this logical links are corresponding is corresponding.Such design has reflected intuitively real physical links decision and the actual total bandwidth corresponding logical links of physical link.
The total bandwidth of described logical links is lower than the total bandwidth of the real physical links of this logical links correspondence.The concrete numerical value of total bandwidth by the control configuration logical link can reach certain control effect.
When physical link broke down, the total bandwidth available of the logical links corresponding with this physical link was set to zero.
The present invention is because according to the link bandwidth in the priority level information allocate communications network of service request, total bandwidth is deducted the occupied bandwidth that priority levels all on the current link is not less than the priority level of current business request distributes as current remaining bandwidth, after the current business request arrives, link bandwidth is at first distributed to the higher business of priority level in the communication network, this just distributes to bandwidth earlier important and urgent as much as possible, the service request that priority level is higher, bandwidth utilization is higher, avoided the lower traffic assignments of some priority levels after the bandwidth, need wait for that but other business finishes the situation that the sky that could work accounts for bandwidth and occur.
Description of drawings
Fig. 1 is that the embodiment of the invention is set up the flow chart of setting up that can support based on the management system of the link bandwidth assignment method of QOS grade in cdma base station;
Fig. 2 is an ABIS mouth logical links Bandwidth Management list structure schematic diagram in the embodiment of the invention;
Fig. 3 is each QOS grade remaining bandwidth computational methods schematic diagram on the logical links in the embodiment of the invention;
Fig. 4 is an assignment logic link methodology flow chart in the embodiment of the invention.
Embodiment
The invention will be further described below in conjunction with accompanying drawing and preferred embodiment.
Quality of service (Quality of Service is called for short QOS) refers to that network provides a kind of ability of higher Priority Service, is with a kind of technology that solves problems such as network delay and obstruction.For some crucial application and multimedia application, these sequencings of using business data packet require than higher, when network over loading or when congested, the QOS technology is according to each professional significance level, when generating, business determines its priority level attribute, making things convenient for priority treatment in the subsequent processes, want traffic carrying capacity not postponed or abandon so that make to take care of yourself as far as possible, guarantee the efficient operation of network simultaneously.Promptly according to the priority level attribute of each business when generating, promptly the QOS grade is its distribute links bandwidth in communication network, has realized the support of QOS function in the present invention.
Be example still, in order at first to set up the management system that to support this distribution method to the carrying out of ABIS mouth in the cdma base station link bandwidth assignment based on the QOS grade with the link bandwidth assignment in the CDMA mobile communcations system.Its management system set up flow chart as shown in Figure 1, may further comprise the steps:
Step 1: for ABIS mouth physical link between BSC and BTS is created logical links:
Physical link for the various different systems of compatible ABIS mouth link, simultaneously also in order to adapt to the demand of different business more flexibly, the physical link of various standards can be mapped as one or more logical links, create unified logical links for the physical link of different systems and come unified management: be the relation of multi-to-multi between physical link and logical links, promptly physical link can corresponding many logical links, many physical links also can corresponding logical links, as can be with many E1 links, or satellite, the Ethernet standard, the optical fiber physical link, or the physical link of microwave physical link is mapped as a logical links, can be many logical links with an E1 link maps also.
For same number of certain physical link, its logical links that maps out is few more, then is that the speed of bandwidth of service request assignment logic link is just fast more, but the then just more well equilibrium of load between the concrete physical link in every logical links; Its logical links that maps out is many more, distributes the search procedure of bandwidth careful more in the different logical links, and the load between physical link is also just balanced more, but that it be the speed of bandwidth of service request assignment logic link is just slow more.What of logical links the user can determine to divide according to concrete situation when dividing logical links.Obviously, if physical link is not become logical links, and directly carry out the distribution of link bandwidth, the load between its physical link is the most balanced, certainly, to the response time of a service request then may be of a specified duration a little.
Step 2: create logical links Bandwidth Management table:
For noting down the band data of each logical links, data admin table of need establishment comes the various band data on each logical links of dynamic management, set the logical links total bandwidth available according to logical link state, manage the bandwidth occupancy situation under each QOS grade on the logical link of each logic, for the scheduling branch of bandwidth manufactures support on the data.To every logical links, logical links Bandwidth Management table all will be created corresponding data recording item for it.
In the base station, in order better to manage operation system, operation system normally is made up of several service sub-systems, and the function of each service sub-system can design as the case may be.Function between the different subsystems can be identical, also can be diverse, certainly, also can be that part is identical.All include several logical links in each service sub-system, wherein, each service sub-system is respectively to there being a logical links Bandwidth Management table.Its structure as shown in Figure 2, every logical links Bandwidth Management table comprises at least one and each corresponding data item of logical links, the item number of data item is consistent with the number of logical links in the current business subsystem; All comprise following data field in each data item:
The link total bandwidth available: the total bandwidth of logical links is usually by the bandwidth decision of the real physical links of this logical links correspondence, so that reflect the actual total bandwidth of current logical links really, certainly, also can artificially adopt the mode of configuration that its numerical value is set, the total bandwidth of logical links is set to be lower than the numerical value of total bandwidth of the real physical links of this logical links correspondence, be controlled under the default value, the bandwidth utilization rate of guaranteeing certain logical links can not be higher than preset value, to reach certain control effect.As: when physical link broke down, the total bandwidth available of the logical links corresponding with this physical link was set to zero;
QOS grade n occupied bandwidth: corresponding with the occupied bandwidth of each priority level respectively.This field value adds up for the professional shared bandwidth value that is distributed in the QOS grade n on this link at every turn, reflects that in real time the true bandwidth of QOS grade n on this logical links takies situation.In case because each service request distribute links bandwidth success, the occupied bandwidth of the QOS grade that it is corresponding promptly changes, therefore, QOS grade n occupied bandwidth needs dynamic the maintenance, to obtain bandwidth occupancy situation real-time on this logical links and each professional QOS grade situation that takies separately in real time;
Wherein, the available bandwidth of each logical links is relevant with Link State, and the situation that takies of bandwidth be don't bother about reason by the QOS ranking score on each logic connected link, and inter-stage bandwidth occupancy data such as each QOS according to priority are associated.
The logical links Bandwidth Management table of above-mentioned ABIS mouth is the data basis to link bandwidth assignment in the communication network and management, need its data of real-time servicing and with the state of physical link hook, when QOS grade n occupied bandwidth changes, real-time update; When detecting certain physics link occurs fault, the total bandwidth available of the logical links of bar physical link correspondence is set to zero therewith, i.e. the bandwidth that button removes this physical link in the total bandwidth of logical links.Because all QOS grade n occupied bandwidth sums must be less than current link total bandwidth available, between the data field of logical links Bandwidth Management table data item certain dependence is arranged, fault-tolerance is stronger, error rate when having reduced allocated bandwidth has to a certain extent reduced the appearance that ABIS mouth link bandwidth is hung situation significantly.
After having finished the foundation of carrying out that can support ABIS mouth in the cdma base station, as shown in Figure 4: when business arrives request distribute links bandwidth, finish the distribution of link bandwidth by following steps based on the management system of the link bandwidth assignment of QOS grade:
When new service request need be distributed the ABIS port band width, judge at first whether this business has the demand (as the professional demand that has given link to distribute when passing that continues of data) of specifying ABIS mouth link assignment bandwidth:
If the business that given link distributes according to the QOS grade that this business itself is carried, is directly calculated the remaining bandwidth of current logical links; Inquire about appointed link remaining bandwidth and whether satisfy professional demand:
Remaining bandwidth according to current link, compare the size of the bandwidth on demand of remaining bandwidth and current business, link bandwidth is distributed: more than or equal to bandwidth on demand, then remaining bandwidth satisfies business demand as if remaining bandwidth, then distribute this link to give professional the use, be allocated successfully; After the allocated bandwidth success of service request, upgrade the data field in the data item corresponding in the logical links Bandwidth Management table, the corresponding record of the logical links that maintenance is assigned with away, the bandwidth value that is about to the QOS grade that is assigned with on this link adds up in into original value, realizes the real-time update of logical links Bandwidth Management table; Otherwise, return professional information of failing in the allocated bandwidth of current link;
Wherein, when computational logic link remaining bandwidth, use the QOS grade mode of priority to realize high QOS grade high priority, promptly high QOS grade can be seized the bandwidth of low QOS grade.In the method for the remaining bandwidth that calculates each QOS grade on the logical links as shown in Figure 3: after obtaining the QOS grade at current logical links and this service request place, total bandwidth available deducts all QOS grades and is not less than the occupied bandwidth of specifying the QOS grade on this logical links, is the remaining bandwidth of this QOS grade on the current logical links;
Business if not the given link distribution, the principle of distributing nearby then based on resource, preferentially in professional this subsystem, seek suitable logical links, promptly travel through all logical links of the current service sub-system corresponding with the current business request, the QOS grade of itself carrying according to this business, calculate the remaining bandwidth of the QOS grade of current business request in each logical links, select the logical links of the logical links of remaining bandwidth maximum, carry out link bandwidth assignment as current distribution bandwidth; The logical links that carries out allocated bandwidth like this is the minimum link of finding out through cyclic query of load;
If remaining bandwidth is more than or equal to bandwidth on demand, remaining bandwidth satisfies business demand on the logical links of remaining bandwidth maximum, and it is professional then to distribute this link to give;
If remaining bandwidth is less than bandwidth on demand, remaining bandwidth can not satisfy business demand on the logical links of remaining bandwidth maximum, then on other service sub-system, search link circuit resource, promptly travel through all logical links of other identical service sub-system of all functions except that the current business subsystem, calculate the remaining bandwidth of specifying on the QOS grade, select the logical links of remaining bandwidth maximum on the QOS grade, wherein, the computational methods of remaining bandwidth are the same;
If remaining bandwidth satisfies business demand on the logical links of remaining bandwidth maximum, it is professional then to distribute this link to give, and is allocated successfully; After the allocated bandwidth success of service request, upgrade the data field in the data item corresponding in the logical links Bandwidth Management table, the corresponding record of the logical links that maintenance is assigned with away, the bandwidth value that is about to the QOS grade that is assigned with on this link adds up in into original value, realizes the real-time update of logical links Bandwidth Management table; If also do not satisfy, then return the traffic assignments failure information.
The present invention has solved between cdma base station system BSC and BTS each link bandwidth assignment of ABIS mouth effectively to the support of professional QOS grade, made full use of each link bandwidth of ABIS mouth between cdma base station system BSC and BTS, and the load between balanced each physical link, improved the utilance of each link bandwidth.
Certainly, above-mentioned communication network link bandwidth assignment method is not only applicable to the CDMA mobile communcations system, to other, have in the network that priority level needs, can both embody its significant effect.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (10)
1. link bandwidth allocation methods in the communication network may further comprise the steps:
A: select the current link that carries out allocated bandwidth;
B: according to the remaining bandwidth of current link, relatively the size of the bandwidth on demand of remaining bandwidth and current business is distributed link bandwidth: if remaining bandwidth more than or equal to bandwidth on demand, is a current business request for allocation bandwidth at current link then, be allocated successfully; Otherwise, return professional information of failing in the allocated bandwidth of current link;
It is characterized in that: among the described step B, the step of calculating the remaining bandwidth of current link is: total bandwidth deducts the occupied bandwidth that priority levels all on the current link is not less than the priority level of current business request.
2. link bandwidth allocation methods in a kind of communication network as claimed in claim 1 is characterized in that: may further comprise the steps in the described steps A:
A1: judge whether the current business request has the demand that given link distributes bandwidth: if then directly carry out step B; If not, execution in step A2 then;
A2: travel through all links in the current system, calculate the remaining bandwidth of each link, selecting the link of current residual bandwidth maximum is current link.
3. link bandwidth allocation methods in a kind of communication network as claimed in claim 2 is characterized in that:
In the described steps A 2, the process that all current links are traveled through may further comprise the steps: all links of the current service sub-system of traversal current business request, calculate remaining bandwidth, and select the link of remaining bandwidth maximum;
Accordingly, among the described step B, after current link bandwidth is distributed, if the allocated bandwidth of current link is failed, then travel through all links of other identical service sub-system of all functions, calculate the remaining bandwidth on each link, in the link of remaining bandwidth maximum, carry out sub-distribution again, if remaining bandwidth satisfies business demand on the link of remaining bandwidth maximum, then is current business request for allocation bandwidth, be allocated successfully; If still can not satisfy business demand, then return professional information of failing in the allocated bandwidth of current link.
4. as link bandwidth allocation methods in claim 1 or the 2 or 3 described a kind of communication networks, it is characterized in that: the logical links of the link in the described steps A for being mapped to by physical link.
5. link bandwidth allocation methods in a kind of communication network as claimed in claim 4 is characterized in that: described standard with logical links corresponding physical link is that E1 is connected one or more in link, satellite connection link, Ethernet connection link, optical fiber physical link or the microwave physical link.
6. link bandwidth allocation methods in a kind of communication network as claimed in claim 4, it is characterized in that: the step of described calculating remaining bandwidth, record the logical links Bandwidth Management table of the bandwidth information that the business of the total bandwidth of current logical links and each priority level distributed by inquiry after, calculate again.
7. link bandwidth allocation methods in a kind of communication network as claimed in claim 6 is characterized in that: described logical links Bandwidth Management table comprises at least one data item, and each data item is corresponding with each logical links respectively; Wherein, comprise following data field in each data item: link total bandwidth available and corresponding with each priority level respectively occupied bandwidth; After the success of the allocated bandwidth of service request, the bandwidth value of the current priority level that is allocated successfully on this link is added up in the occupied bandwidth value of into original priority level correspondence, more corresponding data field in the new data item.
8. link bandwidth allocation methods in a kind of communication network as claimed in claim 4 is characterized in that: the total bandwidth of the real physical links that the total bandwidth of described logical links and this logical links are corresponding is corresponding.
9. link bandwidth allocation methods in a kind of communication network as claimed in claim 4 is characterized in that: the total bandwidth of described logical links is lower than the total bandwidth of the real physical links of this logical links correspondence.
10. link bandwidth allocation methods in a kind of communication network as claimed in claim 9 is characterized in that: when physical link broke down, the total bandwidth available of the logical links corresponding with this physical link was set to zero.
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| CNA2008100659032A CN101227416A (en) | 2008-01-15 | 2008-01-15 | Method for distributing link bandwidth in communication network |
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| CNA2008100659032A CN101227416A (en) | 2008-01-15 | 2008-01-15 | Method for distributing link bandwidth in communication network |
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