CN1754338A - Method for determining the network load in a transparent optical transmission system - Google Patents

Method for determining the network load in a transparent optical transmission system Download PDF

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Publication number
CN1754338A
CN1754338A CN 200480004826 CN200480004826A CN1754338A CN 1754338 A CN1754338 A CN 1754338A CN 200480004826 CN200480004826 CN 200480004826 CN 200480004826 A CN200480004826 A CN 200480004826A CN 1754338 A CN1754338 A CN 1754338A
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network node
optical transmission
network
optical
channel
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P·施吕特
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Siemens AG
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Siemens AG
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0241—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0278—WDM optical network architectures
    • H04J14/0284—WDM mesh architectures

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

Disclosed is a transparent optical transmission system (ASTN) comprising a plurality of network nodes (ZN, AN, A, B, C, D, E) that are interconnected via optical transmission links (1, 2, 3, 4, 5, 6). Several optical connection paths in said transparent optical transmission system (ASTN) are established, maintained, and disconnected from a first optical network node (ZN) to a second optical network node (AN) by means of signaling messages via at least one transmission link (1, 2, 3, 4, 5, 6) which is provided with optical transmission channels. A probability of occupancy (pON(t)) is determined for each optical transmission channel per transmission link (1, 2, 3, 4, 5, 6) in order to improve the network load information in the network nodes (ZN, AN, A, B, C, D, E).

Description

Be used for determining the method for the offered load of transparent optical transmission system
The present invention relates to a kind of method that is used for determining the offered load of transparent optical transmission system, this optical transmission system has a plurality of by optical transmission line network nodes connected to one another, sets up, keeps and remove a plurality of light access paths that have the transmission line of optical transmission channel respectively by at least one from first optical network node to second optical network node in this optical transmission system by means of signaling message.
In the process of internet fast development, in recent years to disproportionately big leap ahead of demand of operational transmission bandwidth.Optical transmission system, particularly based on the progress of the development of the transmission system of wavelength division multiplexing (WDM) technology for realizing that high transmission bandwidth contributes.At this special meaningfully transparent optical transmission system, it can be implemented in the optical arena intactly transmission of data signals, promptly need not data-signal is carried out photoelectricity and electric light conversion.
Transparent optical transmission system is set up by optical transmission line optical network node connected to one another by a plurality of.In the case, optical transmission channel, particularly light wavelength channel are set, are used to transmit light data-signal, particularly wdm optical signal.The operator of this transparent optical transmission system wishes in addition in the raising aspect the matching capacity of the traffic of dynamic change or communication request.Switch matrix is set in optical network node for this reason, they can be on the basis of single wavelength switches light data flow or light data-signal neatly.This is called as dynamically " wavelength route ".By the automation of this " optical channel ", the optical transmission system that can exchange automatically (" ASTN network " (ASTN)) promptly is set, under error situation, obviously shortened reconstruction time and connection setup time.
The optical network node that is provided with in this ASTN is mainly by optical transmission line, particularly the WDM transmission line is connected to each other.In single optical network node, be not provided with under the situation of ripple conversion equipment, necessary is: on each optical transmission line of access path, have identical optical transmission channel, the especially wavelength channel can be for utilizing respectively so that first network node and with second network node that this first network node for example is connected by a plurality of other optical network nodes between set up the light access path.Under the situation of two-way access path, need provide the optical transmission that to use in pairs channel.
This transparent optical transmission system can be realized two light establishment of connections between the user, and wherein each light connection is presented by access path and the determined optical transmission channel of being selected by this transparent optical transmission system.Therefore, for new light establishment of connection, at first should determine the light access path and available optical transmission channel, for example wavelength channel on this light access path.This problem conduct in professional domain " dynamic RWA (route and Wavelength Assignment) " problem is by known.In addition, also there is " static RWA " problem, wherein all connection request hopes are simultaneously known, see also people's such as Zang in the 100th to 108 page of the ieee communication magazine in September calendar year 2001 " Dynamic Lightpath Establishment inWavelength Routed WDM Networks (foundation of the dynamic light path in the WDM of wavelength route network) " for this reason.
When real connection was set up, the respective wavelength channel on all transmission lines of whole access path was occupied, and is no longer available for other the foundation of access path thus.
In order to solve dynamic RWA problem, must know the situation that takies of wavelength channel in the transparent optical transmission system, therefore when handling connection request, can determine also to have the access path of idle wavelength channel at the latest.The priori of the offered load of transparent optical transmission system should be comprised in the case as much as possible, so as can be better with solve dynamic RWA problem quickly and almost avoid vicious be connected to set up attempt.For this reason, offered load determines to have crucial meaning.Be to investigate further, suppose: connection request is not to be handled by the network management unit of central authorities, but the connection request quilt dispersedly, that is to say for example processed in first network node.Different with the solution of concentrating, taking of the transmission channel on the transmission line of overall optical transmission system under the situation of dispersion treatment is not fully known.
In order to determine and to analyze this network load information, introduced diverse ways in some public publications, these methods will be by simple explanation (seeing also people such as Li in the 90th to 96 page of the ieee communication magazine in people such as Zang in the 100th to 108 page of the ieee communication magazine in September calendar year 2001 " DynamicLightpath Establishment in Wavelength Routed WDM Networks " and in February, 2002 " ControlPlane for Design for Reliable Optical Networks (chain of command that is used for the reliable design optical-fiber network) ") for this reason in the back.
-local available occupied information
At this, the seizure condition of the single wavelength channel on the WDM of part transmission line all is known at each constantly, and wherein " local transmission line " can be regarded as the transmission line that is directly connected on the single network node here.In addition, several non-local wavelength channels, the seizure condition of employed those wavelength channels of connection that participated in of corresponding network node is known more precisely.Here shortcoming is, has only a fraction of the taking of all the single wavelength channels in the whole transmission system to know in this way.Particularly do not exist about for example there not being the information of occupied those non-local wavelength channels.
Taking of-all wavelengths channel
All taking of wavelength channel can be distributed in network range by means of Routing Protocol.But last information available is not current usually in this solution, that is to say it is wrong.This is attributable to especially to upgrading the time requirement of employed network load information.In addition, the change of the seizure condition of single wavelength channel also may be very frequent, and therefore the continuous updating of this seizure condition information may interrelate with high resource cost (transmission and calculated capacity).Till now, this high cost is out-of-proportion with the benefit that is reached.
-to the understanding that takies along the wavelength channel of one or more potential access paths
When at first determining potential access path by first network node at connection request, then then can by means of signaling message determine this path free time wavelength channel and keep the wavelength channel of the free time in this path especially at once for this connection request.Be to have only the network full load information of very few number to connect the selection that first network node of setting up is used for this access path for starting in this shortcoming.Correspondingly have such danger, i.e. this selection is disadvantageous or does not have common wavelength channel available that its consequence is to carry out another foundation or necessary this connection request of refusal by another access path for selected access path.
Replacement scheme to this is, at first determines at a plurality of potential access paths by first network node for connecting because the detailed seizure condition that the inquiry at the network node place that is participated in causes, so that select only access path.Here, can realize to different access paths separately before the restriction of k transmission line.In the case disadvantageously, produce the additional cost be used for determining seizure condition and thus obtained seizure condition information and be not used in other connection request.
The central authorities of-available bandwidth distribute
By Routing Protocol, transmission bandwidth available on all transmission lines is distributed by central control unit in network range.At this, only when predetermined threshold value was exceeded or is not exceeded, renewal was only significant.Apparently, this information only is to use conditionally for solving dynamic RWA problem, because it does not describe wavelength channel.
Task of the present invention especially is, provide a kind of method of that improved with respect to described prior art, the offered load that is used for determining transparent optical transmission system, wherein can and need not high signaling cost in network range and determine network load information.
The feature that this task is set out by its characteristic by the feature of the preamble of claim 1 solves.
Major advantage of the present invention is, determines the acquistion probability of each optical transmission channel in the network node of each transmission line.Particularly advantageously, can improve routing decision by means of determined acquistion probability.In addition, the resource cost that need not thus to add just can determined current offered load and estimate with regard to single optical transmission channel, the i.e. offered load in the future with regard to the wavelength channel particularly in the predetermined moment in the network node.
Another advantage of the present invention is, in each network node according to the available seizure condition information in part and/or according to the acquistion probability of determining the optical transmission channel by the seizure condition information that other network nodes transmitted.In addition, seizure condition information determined in each network node, the local transmission channel that exists is transferred to other optical network node by means of signaling message that is directed by optical network node and/or route messages.These single network nodes can make the information that exists in network range enter its routing decision together thus.Thus, obviously reduce the foundation of vicious access path.
Advantageously, the detection under the seizure condition of the local optical transmission channel that exists and the difference is constantly detected as seizure condition information.Thus, the current network load information of all optical transmission channels of transparent optical transmission system is stored in the single network node as the information of " transmission channel x time t free time/occupied " type.
Other favourable expansion scheme of the present invention can be by extracting in other claims.
Describe embodiment in detail by means of accompanying drawing below according to method of the present invention.
This:
The exemplary summary diagrammatic sketch that shows according to one embodiment of the present of invention, transparent optical transmission system of Fig. 1;
Fig. 2 a shows the summary diagrammatic sketch of the structure of a simple waveguide network, is used for setting forth the principle of " Link State " agreement;
Fig. 2 b shows the summary diagrammatic sketch of the structure of the waveguide network shown in Fig. 2 a after interference occurring;
Actual seizure condition that Fig. 3 shows waveguide network with the summary diagrammatic sketch and the comparison that in the situation lower network node A that uses the inventive method, exists about the information of the seizure condition of waveguide network.
Fig. 1 shows according to the first embodiment of the present invention, transparent optical transmission system ASTN (here: ASTN network or ASTN (ASTN=automaticallyswitched transport network)).This transparent optical transmission system has a plurality of by waveguide network LWN (dotting in the diagrammatic sketch according to Fig. 1) junction network node A connected to one another, B, C, D, E, ZN, AN and a plurality of user's jockey, especially customer set up C1, C2, C3, C4, C5.These user's jockeys can be SDH, ATM or the IP customer set ups that other client's side is connected, and for example are ip router (SDH=synchronous digital grade, ATM=asynchronous transfer mode, IP=Internet Protocols).Be connected to transition network node ZN, AN on first and second user's jockey C1, the C2 and be the access network nodes ZN of the connection that is used to set up from first to second user's jockey C1, C2 and as output network node AN.At this, for example begin to be used to connect the required signaling in path by network node as access network nodes ZN.
In waveguide network LWN, each network node ZN, AN, A, B, C, D, E are connected with one or more other network node ZN, AN, A, B, C, D, E respectively by one or more optical waveguide bundle LW or by one or more single fiber waveguide LW1-LW9 respectively.
In order to carry out transfer of data, for example can use WDM data transmission method (WDM=Wavelength DivisionMultip1ex, wavelength division multiplexing) in the inside of waveguide network LWN or transparent optical transmission system ASTN.Based on the wavelength multiplexing technology, can under the situation of using different wave-length coverages respectively, transmit a plurality of binary light signal different, pulsation simultaneously by each the fiber waveguide LW1-LW9 that exists among the transparent optical transmission system ASTN.
Between each network node ZN, AN, A, B, C, D, E, use the first optical transmission channel, optimal wavelength channel to transmit useful signal (in diagrammatic sketch, illustrating) respectively with solid line according to Fig. 1, and second transmission channel, optimal wavelength channel are set respectively, be used for transmitting control message, especially signaling-information or route messages (being shown in broken lines) at diagrammatic sketch according to Fig. 1.
Real useful data is transmitted with the form that is encoded in signaling-information with signaling message in useful signal.In the present embodiment, real useful data and the signaling message different optical transmission Channel Transmission by the same fiber waveguide LW wavelength division multiplexing and/or the time division multiplexing of useful channel that is separated from each other and signaling channel (for example by means of) respectively.In the embodiment that substitutes, relative therewith, signaling message and useful data are respectively by independent fiber waveguide and/or by independent access path transmission.What it is contemplated that equally is transmission by the signaling message of independent network, for example electrical transmission network.
In the present embodiment, for example use " Link State " agreement, so as between network node ZN, AN, A, B, C, D, E the switching network load information.
" Link State " agreement is based on " network interface card of dispersion ".Among network node ZN, AN, A, B, C, D, the E each all has (not being illustrated) storage device, stores data set in this storage device, (topology) card that this data set representative is complete or the structure of waveguide network LWN.The part of this data set for example also is the information about the seizure condition of the single wavelength channel on the single transmission line 1,2,3,4,5,6.
Below, set forth the principle of " Link State " agreement by means of the simple waveguide network LWN shown in Fig. 2 a and the 2b.This waveguide network LWN for example has 5 network node A, B, C, D, E, and they are connected to each other by 6 transmission lines 1,2,3,4,5,6.
The structure of this data network DNM can for example be represented by data set following, that stored in all-network node A, B, C, D, E according to table 1:
Q connects certainly: R connect to: S connects: The T state:
?A ?B ?1 ?1
?A ?D ?3 ?1
?B ?A ?1 ?1
?B ?C ?2 ?1
?B ?D ?4 ?1
?C ?B ?2 ?1
?C ?E ?5 ?1
?D ?A ?3 ?1
?D ?E ?6 ?1
?D ?B ?4 ?1
?E ?C ?5 ?1
?E ?D ?6 ?1
Table 1
Here, the first variable Q (" connect from: ") is the sign of such network node, be that corresponding transmission line is from this network node, second variable R (" connect to: ") is the sign of the network node that leads to of corresponding transmission line, and ternary S (" connection ") is the sign of corresponding transmission line.The seizure condition of the corresponding transmission line of the 4th variable T (" state ") expression.
Occupied transmission line can for example be represented (referring to the 4th row of top table 1) by the state variable with value " 1 ".If this transmission line is unoccupied, then state variable T is correspondingly by adaptive (for example: by being worth " 1 " to value " 0 " or " ∞ ").
Because the whole network topology is known for each network node A, B, C, D, E, so for example each node oneself can calculate unoccupied or favourable transmission channel or the wavelength channel of difference of (arbitrarily) another network node A, B, C, D, E.
Fig. 2 b shows the summary diagrammatic sketch of the structure of the waveguide network LWN shown in Fig. 2 a after network topological change, and here: the transmission line 1 between network node A and the network node B disconnects.The change of the state of corresponding transmission line 1 is discerned by network node A and network node B.The data set that network node A and network node B upgrade wherein respectively to be stored, and the data set after remaining network node C, D, E transmission are upgraded.So-called " Flooding " agreement is used for this.Therefore in one embodiment of the invention, the seizure condition of the wavelength channel in each optical network node A, B, C, D, E on light travels channel, the transmission line 1,2,3,4,5,6 that promptly especially is connected with this optical network node, and by means of the signaling message that is guided by optical network node A, B, C, D, E and relevant detection t constantly 0Be transferred to other optical network node A, B, C, D, E together.In each network node A, B, C, D, E, seizure condition information is stored in the data set.
In Fig. 3, exemplarily show the seizure condition B of the reality of waveguide network LWN with the summary diagrammatic sketch TatWith the seizure condition B that exists among the network node A about data network DNW AThe comparison of information.In other words: offered load of seeing from the angle of network node A and the current offered load of overall optical waveguide network LWN compare.In the case, for reason clearly, only exemplarily investigate an optical transmission channel, the i.e. seizure condition of especially single wavelength.Here, be illustrated in 5 different moment t 0=1 to t 0The seizure condition of=5 waveguide network LWN, wherein in the diagrammatic sketch of the waveguide network LWN at the visual angle of representing network node A, the detection of listing seizure condition information on each in six transmission lines 1,2,3,4,5,6 respectively is t constantly 0
At moment t 0=0 o'clock, the waveguide network LWN shown in bringing into use, promptly whole operational wavelength channel also unoccupied (all transmission lines 1,2,3,4,5,6 illustrate as fine rule in Fig. 3).Then up to moment t 0=1 for example makes the seizure condition of the transmission channel on existing, the transmission line 1,2,3,4,5,6 known in network range by route messages.Because also there is not access path to be established, so all seizure conditions of the transmission channel of being investigated on the transmission line 1,2,3,4,5,6 are correctly detected.
At moment t 0=2 o'clock, set up between network node D-E-C in waveguide network inside and keep the light access path.This light access path required, the taking in Fig. 3 of wavelength channel on the 5th and the 6th transmission line 5,6 represented with thick line.Because network node A be not the part of access path D-E-C and therefore signaling message be not conducted through network node A, so in network node A not to upgrading about the network load information of the 5th and the 6th transmission line 5,6.Therefore, in network node A at moment t 0=2 do not exist the network load information that reflects altered seizure condition.Therefore, stored in the data set this also has and detects t constantly about the network load information of the 5th and the 6th transmission line 5,6 0=0.In contrast, whenever the seizure condition of the transmission line 1,3 of two parts all is known, i.e. their detection is t constantly 0Therefore be t 0=2.
At moment t 0=3, transmit the relevant seizure condition that be connected the information of transmission line 2,5 network node C on by means of route messages to other network node, especially network node A by network node C.The network load information of being stored among the network node A is updated.The seizure condition B that sees from the angle of network node A ADetermine that the method for offered load is at moment t based on being used for of being advised 0=3 have obviously higher and actual seizure condition B TatConsistency.Be updated up to the all-network load information that in single transmission line 4,6 upper network node A, exists.
Then, at moment t 0=4, set up the access path between the network node A-B-C.Because network node A is the part of access path, so transmit whole current seizure condition information to it by means of signaling message.These current seizure condition information are analyzed in network node A, so that new data set more.After analyzing, obtain seeing from the angle of network node A, Fig. 3 at moment t 0Seizure condition B shown in=4 AUp to transmission line 6, the visual angle of network node A and actual seizure condition B TatConsistent.Therefore, pass through the distribution of the seizure condition information of being advised, the resource that in fact need not to add by means of signaling message and/or route messages spends in the obvious improvement that has just realized network load information in the single network node.
At moment t 0=5, access path D-E-C is removed again.But because network node A do not participate in this access path, so see from the angle of network node A and not perceive this dismounting.Therefore from the angle of network node A, the wavelength channel that is guided by transmission line 5 continues to be considered to occupied.This is again by being assigned to the detection moment t of transmission line 5 in the drawings 0=4 and thick line represent.
The layout of the data set that is transmitted can be used as the static characteristic of node and distributes in network range by route messages.In order to transmit these local seizure condition information, each transmission line and wavelength channel for example only need 1 bit respectively.In addition, have only when setting up or removing and have the network node A, the B that are investigated, during the connection of the participation of C, D, E, the renewal of data set is only necessary.
Being used for of being advised determines that the basis of the method for offered load is to estimate the present unreliability that takies about wavelength channel according to acquistion probability.Therefore not only between idle (OFF) and occupied (ON), distinguish, but also introduce confirmable acquistion probability for the moment t in future
p ON(t)=the P{ channel is at moment t Occupied.
The variation in time of this acquistion probability can be estimated under the situation of analysis user behavior.By means of this acquistion probability p ON(t) can obviously improve routing decision.When the seizure condition of wavelength channel is known, then for example obtain following probable value:
p ON(t)=1 (wavelength channel is occupied) or
p ON(t)=0 (wavelength channel free time).
Each single wavelength channel switches between two states: OFF (free time) and ON (taking) wherein should mainly be determined by user behavior in switching.Idle duration T OFFWith take duration T ONBe two stochastic variables, its distribution function or characteristic quantity, definite approx by sampling such as desired value and variance.These distribution functions or characteristic quantity are distributed in network range by route messages.For example with regular time intervals or alternatively send when the offered load significant change and upgrade.
By means of the information that these transmitted, can in each network node A, B, C, D, E, estimate the acquistion probability p of corresponding optical transmission channel, especially wavelength channel ON(t).
Under the situation of the seizure condition information that in network node, does not exist, obtain at wavelength channel acquistion probability separately:
p ON ( ∞ ) = ⟨ T ON ⟩ ⟨ T ON ⟩ + ⟨ T OFF ⟩ ,
Wherein＜... represent corresponding expectation of a random variable.If but seizure condition is detecting t constantly 0Be known, then can improve p ON(t) estimation.This estimation especially can also come additionally to improve in the ordinary course of things in the following manner, promptly about detecting t constantly 0The information of duration of current seizure condition enter this estimation together.
Even when first stochastic variable takies duration T ONWith the idle duration T of second stochastic variable OFFOnly by the above-mentioned characteristic quantity that in network range, distributes
P ON(∞) (average load) and
＜T ON(average take duration)
When describing, the also estimation that can realize.
Each node within the transparent optical transmission system is known these two characteristic quantity p of all wavelengths channel ON(∞),＜T ON.By the average duration＜T that takies ONSingle mean value constitute the average overall average " T that takies the duration ON".By this average overall average " T that takies the duration ON" and average load p ON(∞) the distinctive occupancy K of following formation channel:
κ = 1 ⟨ ⟨ T ON ⟩ ⟩ · ( 1 - p ON ( ∞ ) ) .
The distinctive occupancy K of this channel is following to be entered together to current acquistion probability p ON(t) in the estimation:
p ON ( t ) = p ON ( ∞ ) + ( 1 - p ON ( ∞ ) ) · exp ( - κ ( t - t 0 ) ) p ON ( ∞ ) - p ON ( ∞ ) · exp ( - κ ( t - t 0 ) ) For p ON ( t 0 ) = 1 p ON ( t 0 ) = 0 .
By means of this probability, according to the method for being advised upgrade from the past till now seizure condition information and therefore upgrade network load information.Therefore, the seizure condition information that " past " about wavelength channel can be taken is used for routing decision in the future.Because need only in network range, distribute two characteristic quantity (average load p that slowly change ON(∞) with the average duration＜T that takies ON), so required for this reason additional routes traffic is smaller.Compare with the solution of always distributing all seizure condition variations in network range, the method for passing through to be advised reduces the resource cost significantly under the situation of learning offered load better.
In the case, each wavelength channel takies by means of acquistion probability p ON(t) come to determine or at moment t 0Estimate (anschaetzen).The acquistion probability p of each optical transmission channel ON(t) be accurate under following hypothesis, promptly stochastic variable " take the duration " and " idle duration " by the distribution of index law ground and do not rely on optical transmission channel, the especially wavelength channel of being investigated itself.Here the advantage of employed solution is, because the memoryless property of exponential distribution, so need only consider at moment t 0Seizure condition and constantly seizure condition before needn't considering.
In addition, can followingly expand the method for being advised, promptly not only determine, distribute and analyze the average load p of all optical transmission channels ON(∞) with the average duration＜T that takies ON, but also in network node, determine, distribution and analyze correlation between the seizure condition of optical transmission channel.When the network node of investigating when passing through is also set up other access path, then especially there is correlation.
The quality of estimating especially can be improved in the following manner, though promptly consider the seizure condition in all past, the just firm seizure condition in the past of corresponding optical transmission channel is weighted more strongly.
Being used for of being proposed determines that the method for the offered load in the transparent optical transmission system ASTN not only can use when setting up directed light access path, and can use when setting up nondirectional (two-way) light access path.

Claims (9)

1. be used for determining the method for the offered load of transparent optical transmission system (ASTN), described transparent optical transmission system has a plurality of by optical transmission line (1,2,3,4,5,6) network node connected to one another (ZN, AN, A, B, C, D, E), in described transparent optical transmission system, set up, keep and remove a plurality of transmission lines (1,2,3 that have the optical transmission channel respectively by at least one from first optical network node (ZN) to second optical network node (AN) by means of signaling message, 4,5,6) light access path
It is characterized in that,
The network node of each transmission line (1,2,3,4,5,6) (ZN, AN, A, B, C, D determines the acquistion probability (p of each optical transmission channel in E) ON(t)).
2. according to the method for claim 1,
It is characterized in that,
In corresponding network node (A) by means of the spendable network load information in part and/or by means of by other network node (B, C, D, E) network load information that is transmitted is determined the acquistion probability (p of optical transmission channel ON(t)).
3. according to the method for claim 1 or 2,
It is characterized in that,
At each optical network node (A, B, C, D determines the network load information of the local optical transmission channel that exists in E), and by means of by described optical network node (A, B, C, D, E) signaling message that is guided and/or routing iinformation are transferred to described network load information other optical network node (A, B, C, D, E).
4. according to the method for claim 2 or 3,
It is characterized in that,
(ON is OFF) with the affiliated respectively detection moment (t for the seizure condition of the optical transmission channel that described part exists 0) detected as network load information.
5. according to the method for claim 3 or 4,
It is characterized in that,
Optical network node (A, B, C, D, the described local optical transmission channel that exists E) be positioned at the network node of being investigated (A, B, C, D is on the transmission line that E) is connected (1,2,3,4,5,6).
6. according to the method for one of claim 3 to 5,
It is characterized in that,
Each network node (A, B, C, D, determine in E) each local optical transmission channel that exists, as first stochastic variable analyzed take duration (T ON) and as the analyzed idle duration (T of second stochastic variable OFF) characteristic quantity as network load information.
7. according to the method for claim 6,
It is characterized in that,
Determine described first the expectation of a random variable (＜T ON) and average acquistion probability (p ON(∞)) as first and second characteristic quantities.
8. according to the method for claim 7,
It is characterized in that,
First and second the characteristic quantity (＜T by the optical transmission channel ON, p ON(∞)) determine the distinctive occupancy of channel (K), be the acquistion probability (p in future of estimating the optical transmission channel ON(t)) the distinctive occupancy of described channel is analyzed.
9. according to the method for one of claim 1 to 8,
It is characterized in that,
When in described transparent optical transmission system (ASTN), setting up the light access path, consider described acquistion probability (p at each transmission channel ON(t)).
CN 200480004826 2003-02-21 2004-01-29 Method for determining the network load in a transparent optical transmission system Pending CN1754338A (en)

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DE10307493.7 2003-02-21
DE2003107493 DE10307493B4 (en) 2003-02-21 2003-02-21 Method for determining the network utilization in a transparent optical transmission system
DE10310798.3 2003-03-12

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