CN106454859B - Access layer network dispositions method and system - Google Patents

Abstract

The present invention relates to a method and system for deploying an access layer network. The method includes: acquiring the probability value of each node of the access link of the access layer network where a newly-built base station is nearby; assuming that the target on the access link A new generation network device is pre-placed on the node, wherein the target node is a current generation network device node on the access chain; and the newly built base station is respectively connected to the nearest new generation network on each of the nodes The path length value of the device node, wherein the current new generation network device node includes the target node and the existing new generation network device node on the access chain; according to each of the probability values and the currently acquired path lengths Determine the expected path value corresponding to the target node; obtain the deployment scheme of the access layer network according to the expected path value corresponding to each current generation network device node. By adopting the solution of the invention, the fiber jumping distance for connecting a newly built base station to a PTN node can be shortened, and tight fiber core resources between base stations can be saved.

Description

Access layer network deployment method and system

technical field

The present invention relates to the technical field of optical communication networks, in particular to an access layer network deployment method and system.

Background technique

The local transmission network refers to the transmission network entity established within a city by using optical fiber transmission technology to solve various business needs of the city. Business requirements include wireless base station backhaul, group customer dedicated lines, home broadband, etc., which are usually constructed by operators. The optical fiber transmission technologies used in the local transmission network include SDH (Synchronous Digital Hierarchy, Synchronous Digital System)/MSTP (Multi-Service Transfer Platform, multi-service transmission platform based on SDH), PTN (Packet Transport Network, packet transport network), IP RAN ( IP-based wireless access network), WDM (Wavelength Division Multiplexing System)/OTN (Optical Transport Network, Optical Transport Network), PON ((Passive Optical Network, Passive Optical Network)), etc.

SDH/MSTP is an early local transmission technology that uses fixed time slots to transmit fixed-bandwidth services. It is characterized by stable bandwidth and good protection. The disadvantage is that the bandwidth utilization efficiency is low, and the current dynamic bandwidth and routing packetization cannot be used. Business needs.

PTN and IP RAN are developed from SDH and routers respectively, and are the products of mutual penetration of traditional optical transmission technology SDH/MSTP and IP routers. These two technologies can meet the requirements of packetized services in terms of bandwidth, QoS (Quality of Service), routing, protection, etc., so they are the mainstream transmission technologies for communication operators to solve local services.

Based on optical wavelength multiplexing technology, WDM/OTN can simultaneously transmit optical signals on multiple wavelengths of an optical fiber, and has a large bandwidth. It is mainly used to solve the business needs of large bandwidth particles (GE or above) in the local network.

The networking of the above-mentioned transmission technologies mainly adopts a ring structure, which is convenient for the protection of service nodes and the switching of service routes, while PON is a point-to-multipoint tree-shaped transmission technology. It is characterized by flexible networking, low cost, high fiber utilization rate, but weak protection, and is mainly suitable for the access needs of customers such as home broadband Internet access.

The local transmission network of some operators mainly adopts PTN technology to construct at present. PTN technology is a two-way point-to-point connection channel based on packet switching services, and has end-to-end networking capabilities suitable for various fine-grained services. Compared with SDH, it provides a "flexible" transmission pipeline that is more suitable for the characteristics of IP services, and has rich protection methods. When a network failure occurs, it can realize carrier-level service protection switching based on 50ms, and realize transmission-level service protection and recovery; Inheriting the operation, management and maintenance mechanism (OAM) of SDH technology, it has a perfect OAM system of point-to-point connection, ensuring that the network has protection switching, error detection and channel monitoring capabilities.

Based on the above characteristics, some operators adopt PTN as the mainstream transmission technology to solve the backhaul circuit of the local network base station. Base station backhaul refers to the circuit requirements between the base station (BS) and the base station controller (BSC) of the mobile network RAN layer. Some operators have a wide distribution of wireless base station nodes, and the base station controllers are mainly located in some counties or urban areas. The core node computer room, so the flow direction of the backhaul circuit of the base station is that each base station converges to the core node in the urban area or county.

From the perspective of network structure, as shown in Figure 1, the PTN network of the operator's local network can generally be divided into three layers. The access layer is that the PTN equipment of each base station adopts ring dual homing to the aggregation nodes in each aggregation area. It forms a convergence ring between them and connects with the core node, and is responsible for attributing the converged services to the core node where the base station controller is located. Large-capacity PTN equipment is used between core nodes to form a core dispatching ring, which is responsible for circuit dispatching between each core node. In principle, the PTN access layer is a ring, but in actual construction, due to unsatisfactory optical cable conditions or urgent circuit opening time, chain networking will also be used.

As shown in FIG. 2 , it is a schematic diagram of a new base station PNT deployment method. Since the PTN at the access layer is mainly deployed in 2G and 3G base stations, an access ring is formed with the PTN equipment at the aggregation node to meet the circuit backhaul requirements of the base station. According to the construction principle, all new base stations will use PTN equipment, and the original 2G base stations that use SDH equipment to meet the needs of backhaul circuits will gradually be replaced by PTN equipment. In actual engineering, since the supporting optical cables of the newly built base stations are usually connected to the nearby base stations, the PTN equipment of the newly built base stations generally forms a ring or chain network with the nearest PTN nodes or aggregation nodes (it is usually a chain at the beginning, and then later) optimized into a ring).

In the initial stage of the PTN network, the number of PTN nodes is small. Usually, the base station connected to the nearest access cable of the new base station is not a PTN device node, which requires multiple fiber jumps to connect to the nearest PTN node. Too many fiber jumps will cause tension between the fiber cores of the original base stations, which will bring pressure to maintenance; at the same time, some newly-built nodes may need to be equipped with long-distance optical modules due to excessive fiber jumps. If the distance between nodes is shortened, it needs to be changed to a short-distance module or an attenuator is added, which adds variables to the project. With the construction of new base stations in batches, this construction mode lacks comprehensive and overall consideration, which will cause confusion in the access network and bring greater workload to the later transformation.

Contents of the invention

The purpose of the present invention is to provide an access layer network deployment method and system, which can reduce the situation of excessive fiber jumping during construction.

The purpose of the present invention is achieved through the following technical solutions:

A method for deploying an access layer network, comprising:

Obtain the probability value that the newly-built base station is connected to each node of the access chain of the access layer network;

It is assumed that a new generation network device is pre-placed on the target node on the access chain, wherein the target node is a current generation network device node on the access chain;

Acquiring the path length values of the new generation network equipment nodes closest to each of the nodes, where the current new generation network equipment node includes the target node and the existing network equipment nodes on the access link. There are new generation network equipment nodes;

determining an expected path value corresponding to the target node according to each of the probability values and each currently obtained path length value;

The deployment scheme of the access layer network is obtained according to the expected path value corresponding to each current generation network device node.

An access layer network deployment system, comprising:

The probability acquisition module is used to acquire the probability value of each node of the access chain connected to the access layer network near the newly-built base station;

An assumption module, configured to assume that a new generation network device is pre-placed on the target node on the access chain, wherein the target node is a current generation network device node on the access chain;

A length acquisition module, configured to acquire the path length values of the new generation network equipment nodes closest to each of the nodes, where the current new generation network equipment node includes the target node and the Access to existing new-generation network equipment nodes on the chain;

A processing module, configured to determine an expected path value corresponding to the target node according to each of the probability values and each currently obtained path length value;

A scheme acquiring module, configured to acquire the deployment scheme of the access layer network according to the expected path value corresponding to each current-generation network device node.

According to the above-mentioned solution of the present invention, it is to obtain the probability value that the newly-built base station is adjacent to each node of the access chain of the access layer network; assuming that the new generation network equipment is pre-placed on the target node on the access chain, Wherein, the target node is a current-generation network device node on the access chain; obtain the path length values of the new-generation network device nodes closest to each of the nodes that are closest to each of the newly-built base stations, wherein, The current new generation network device node includes the target node and the existing new generation network device node on the access chain; determine the expected value corresponding to the target node according to each of the probability values and the currently obtained path length values Path value; obtain the deployment plan of the access layer network according to the expected path value corresponding to each current-generation network device node, adopt the solution of the present invention, find out the node with the shortest expected path as the key node, and place the new-generation network device in advance , can shorten the jumper distance between the new base station and the new generation network equipment node, and save the tense fiber core resources between the base stations.

Description of drawings

Fig. 1 is a schematic diagram of a local PTN network;

FIG. 2 is a schematic diagram of a new base station PNT deployment method;

FIG. 3 is a schematic diagram of an implementation flow of an access layer network deployment method according to Embodiment 1 of the present invention;

Figure 4 is a schematic diagram of a traditional PNT deployment method;

Fig. 5 is a schematic diagram of the principle of the PNT deployment mode of the solution of the present invention;

Fig. 6 is the schematic diagram of model one (without branch chain) in concrete example 1;

Fig. 7 is the schematic diagram of model one (with branched chain) in concrete example 1;

Fig. 8 is a schematic diagram of model 2 in specific example 2;

FIG. 9 is a schematic diagram of the composition and structure of the access layer PTN network deployment system according to Embodiment 2 of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, and do not limit the protection scope of the present invention.

Since PTN replaces SDH equipment is an inevitable trend of network development, the basic idea of the present invention is to change the existing way of deploying PTN equipment completely following the wireless base station, and place PTN equipment in advance in some key nodes, and the new wireless base station in this issue The PTN is jointly networked together, thereby shortening the fiber jump distance between the newly built base station and the PTN node, and saving the tense fiber core resources between the base stations.

For the selection of key nodes, it is to establish an abstract mathematical model, use statistical methods to analyze the expectations of new nodes connecting existing node paths according to a certain probability, and find out the node with the shortest expected path as the key node, together with the new base station in this period Deploy PTN equipment. After adopting this deployment method, the fiber jumping paths of other base stations in this area can be reduced, thereby saving base station fiber core resources. The scheme of the present invention is described in detail below.

Embodiment one

An embodiment of the present invention provides an access layer network deployment method. FIG. 3 is a schematic diagram of the implementation flow of the access layer network deployment method in Embodiment 1 of the present invention. As shown in FIG. 3 , the access layer network deployment in this embodiment Methods include:

Step S101: Obtain the probability value that the newly-built base station is connected to each node of the access chain of the access layer network nearby;

Here, the nodes include new-generation network device nodes and current-generation network device nodes, wherein the new-generation network device nodes refer to nodes on which new-generation network devices are placed, and the current-generation network device nodes refer to nodes using current-generation network devices;

Here, each probability value can be set according to actual needs, and can be the same or different. Generally, it is better to have the same probability value on each node of the access link of the access layer network adjacent to the newly-built base station. As an assumption, assume that they are all constants, such as a;

Step S102: Assume that a new generation network device is pre-placed on the target node on the access chain, wherein the target node is a current generation network device node on the access chain;

It should be noted that, since the new-generation network equipment is pre-placed on the target node here, that is, the current-generation network equipment corresponding to the current-generation network equipment node is replaced by the new-generation network equipment, the target node at this time is assumed to be Become a new generation network device node;

Step S103: Obtain the path length values of the nearest new-generation network equipment nodes connected to each of the nodes by the newly-built base station, wherein the current new-generation network equipment node includes the target node and the access link Existing new-generation network device nodes on the network;

Step S104: Determine the expected path value corresponding to the target node according to each of the probability values and each currently obtained path length value;

Specifically, according to determining an expected path value corresponding to the target node;

Among them, Q _i represents the expected path value corresponding to the target node, a _i represents the probability value that the newly-built base station is close to the jth node of the access chain, and p _i represents the probability value that the newly built base station is close to the jth node of the access chain The path length value of the nearest new-generation network device node on the jth node of , n represents the number of new-generation network device nodes in the access chain, and m represents the current-generation network device in the access chain the number of nodes;

Step S104: Obtain the deployment plan of the access layer network according to the expected path value corresponding to each current generation network device node;

Specifically, the expected path value corresponding to each current-generation network device node can be determined according to the above-mentioned steps S102 and S103, and the current-generation network device with a smaller or smallest expected path value can be selected according to the expected path value corresponding to each current-generation network device node Nodes, the selected current-generation network equipment nodes are determined as the current-generation network equipment nodes that need to place new-generation network equipment first, which is equivalent to the aforementioned key nodes, and new-generation network equipment will be deployed together with the newly built base stations in this phase. After adopting this deployment method, the fiber jumping paths of other base stations in this area can be reduced, thereby saving base station fiber core resources.

The access layer network deployment method in one of the embodiments may further include: judging whether a current-generation network device node on the access chain is assumed to pre-place new-generation network devices; The step of obtaining the deployment plan of the access layer network for the expected path value corresponding to the network device node; if not, selecting a current-generation network device node from the current-generation network device nodes that are not assumed to place the new-generation network device as the The new target node enters the step of assuming that the target node on the access chain pre-places new generation network equipment. That is to say, it is necessary to determine the expected path value corresponding to each current-generation network device node according to the above steps S102 and S103, and then determine the expected path value corresponding to the target node according to each said probability value and each currently acquired path length value value step.

In addition, considering that there is a branch chain on the chain, it is obvious that the expected path value corresponding to placing a new generation of network equipment on a node on the branch chain is greater than placing a new generation network device on a node on the main chain connected to the branch chain. Therefore, it is relatively unreasonable to place a new generation network device on a certain node on the branch chain. Therefore, the nodes on the branch chain can be considered differently. For this reason, in one of the embodiments , the target node is a current-generation network device node on the main chain of the access chain.

In one of the embodiments, the above-mentioned new-generation network equipment is PTN equipment, and the above-mentioned current-generation network equipment is SDH equipment.

In order to facilitate the understanding of the solution of the present invention, taking the new-generation network equipment as PTN equipment, the current-generation network equipment as SDH equipment, the new-generation network equipment nodes as PTN nodes, and the current-generation network equipment nodes as SDH nodes as examples, the principles of the present invention and specific examples.

For ease of description, the deployment method of PTN equipment is abstracted here. The current method is that the newly built base station is connected to the nearby base station through the nearby optical cable, and then connected to the PTN convergence point or the existing PTN base station node through the jumper fiber, as shown in Figure 4 Show:

It can be seen from the figure that for the newly-built base stations A and B using PTN equipment, the optical cables are placed nearby to L4 and L6, and the PTN network needs to be jumped to the L0 node to form a PTN network. The path length is 4 (assuming that each segment is 1, ignore The nearest fiber optic cable), occupying a total of 16 cores (2 cores per section, the numbers in brackets and).

The basic idea of the solution of the present invention is to pre-place the PTN device to the key node, where L2 is taken, as shown in Figure 5:

In this way, the new base stations A and B only need to be connected to the PTN node L2, and the respective paths are 2; including the fiber cores occupied by the PTN equipment added by L2, a total of 12 cores are occupied (the numbers in brackets and). Compared with the original method, the path is shortened by 50%, and the fiber core occupation is reduced by 25%. The price paid for the new construction model is only the need to add one end of equipment, and under the premise of large-scale construction of PTN, the increase of this end equipment is also inevitable.

Under the general trend of base station PTN replacing SDH, the key consideration is how to select L2 nodes - obviously the results of choosing L2 and L3 to pre-place PTN are different, so it can be summarized as the following proposition: In a network with a small number of known PTN nodes How to select the node where the PTN is placed in advance, so that the expected path between the next randomly appearing new point and the existing PTN node is the shortest.

In a complex network, the selection of key nodes will not be so obvious. Let’s analyze some simple models first. First, there are three assumptions:

Assuming that there are many new base stations, for the sake of comparison, the differences in fiber core occupancy of the pre-placed PTN nodes themselves are ignored (this can be assumed when there are fewer key nodes).

Assume that the nearest node accessed by the new base station has the same probability as the existing network node, which is set as a constant a.

The priority of selecting key nodes is only meaningful to rings or nodes on the chain that have a connection relationship (connected only at the sink point).

Specific example 1

This specific example 1 is described by taking the single-node type (model 1, shown in FIG. 6 ) established according to the network structure as an example.

This situation places PTN equipment for only one node on the access chain. Consider a chain of length n, where L0 is the node of the existing PTN equipment, assuming that the new node is connected to Li (i=0~n-1) and the path away from the existing PTN node is Pi, and according to the assumption premise 2 , the probability of being connected to each node is equal to a. Then the expected path of the newly added node is Q=∑(pi*a)/(n+1), and after the PTN is pre-placed in Lj, the expected path value is Qj.

For a chain with a path length of 4, assuming that PTN equipment is placed on L1, the path length value of the newly-built base station is close to the nearest PTN node (L0) on L0, and the value of the path length is 0, and the newly-built base station is close to the nearest PTN node (L1) on L1 The path length value of the new base station is 0, the path length value of the newly-built base station is 1 to the nearest PTN node (L1) on L2, the path length value of the newly-built base station to the nearest PTN node (L1) on L3 is 2, and the newly-built The path length value of the nearest PTN node (L1) on L4 to the base station is 3, therefore, Q1=(0*a+0*a+1*a+2*a+3*a)/5=6a/ 5; Calculate Q2=4a/5, Q3=3a/5, Q4=4a/5 similarly. Therefore, in this case, it is more appropriate to place PTN equipment first at L3, which is lower than the worst value of 25%. Similarly, the expected path value Q with other lengths can be calculated.

For the case where there are branch chains on the chain, as shown in Figure 7, it is obviously unreasonable to place PTN at the branch chain node L21, which is not as good as L2. The node is equivalent to adding 1a after repeated calculation of L2, and directly adding 1a to the Q of L2, so it is calculated that Q1=8a/6, Q2=5a/6, Q3=5a/6, Q4=7a/6, in this In this case, both L2 and L3 are optimal, 37.5% lower than the worst value. Therefore, it can be seen that after adding a branch, the priority will change.

Specific example 2

This specific example 2 is described by taking the two-node type established according to the network structure (model 2, as shown in FIG. 8 ) as an example.

This situation refers to the existing two sets of PTN equipment on one access chain—this situation usually occurs in the ring between two existing PTN aggregation nodes.

When calculating the Q value, the only difference between Model 2 and Model 1 is that nodes can choose the nearest PTN node. Calculations similar to Model 1 can be obtained: Q1=4a/6, Q2=3a/6, Q3=3a/6, Q4=4a/6. In this case L2 and L3 are optimal, 25% below the worst value; and L1 and L4, the Q values of L2 and L3 are symmetrical. In the same way, the results of the branched chain under this model can be obtained, which will not be calculated here.

According to the above calculations, several meaningful inferences can be drawn for selecting key nodes (nodes with lower Q values are preferred as key nodes):

Without considering branch chains, for a chain with a path length of 3, the Q value of the second node is low; for a chain with a path length of 4 or 5, the Q value of the third node is low; for a chain with a path length of 6 chain, the 4th node has a lower Q value.

After considering the branch chain, adding a branch chain node will reduce the Q value ranking of the nodes on the chain where the branch chain node is located.

If you can choose when adding a branch chain, choosing a node with a lower Q value will reduce the minimum Q value when adding nodes in the future.

In the case of PTN at both ends, the Q value of the node near the middle is lower.

For a three-intersecting ring, the optimal Q value will not appear on a ring with fewer nodes.

For points with the same Q value on the same system, it can be compared according to the fiber core occupied by the PTN set at this node or the difficulty of engineering implementation.

Embodiment two

According to the access layer network deployment method of the present invention in the foregoing embodiments, the embodiments of the present invention further provide an access layer network deployment system. FIG. 9 is a schematic diagram of the composition and structure of the access layer network deployment system according to Embodiment 2 of the present invention. Fig. 9 shows a schematic structural diagram of a preferred example of the reactive power control system of the converter station of the present invention. Depending on different considerations, when implementing the reactive power control system of the converter station of the present invention, all of the systems shown in FIG. 9 may be included, or only a part of them shown in FIG. 9 may be included.

The access layer network deployment system in one of the embodiments includes the probability acquisition module 201, assumption module 202, length acquisition module 203, processing module 204, and scheme acquisition module 205 in FIG. 9, wherein:

The probability acquisition module 201 is used to acquire the probability value of each node of the access link of the access layer network adjacent to the newly-built base station;

An assumption module 202, configured to assume that a new generation network device is pre-placed on the target node on the access chain, where the target node is a current generation network device node on the access chain;

The length acquisition module 203 is configured to acquire the path length values of the new generation network equipment nodes closest to each of the nodes, where the current new generation network equipment node includes the target node and the new generation network equipment node. Existing new-generation network equipment nodes on the access chain;

A processing module 204, configured to determine an expected path value corresponding to the target node according to each of the probability values and each currently acquired path length value;

The scheme acquisition module 205 is configured to acquire the deployment scheme of the access layer network according to the expected path value corresponding to each current generation network device node.

The access layer network deployment system in one of the embodiments may also include the judging module 206 in FIG. 9;

The judging module 206 is used for judging whether a current-generation network device node on the access chain is assumed to pre-place a new-generation network device;

The scheme acquisition module 205 acquires the deployment scheme of the access layer network according to the expected path value corresponding to each current generation network device node when the judgment result of the judgment module is yes;

The assumption module 202 also selects a current-generation network device node as a new target node from the current-generation network device nodes that have not been assumed to place the new-generation network device when the determination result of the determination module is no, and re-assumes that the new-generation network device The process of pre-positioning new generation network equipment on the target node on the access chain.

In one of the embodiments, the target node is a current generation network device node on the main chain of the access chain.

In one of the embodiments, the probabilities that the newly-built base station is adjacent to each node of the access chain of the access layer network are the same.

In one of the embodiments, the processing module 204 is based on determining an expected path value corresponding to the target node;

Among them, Q _i represents the expected path value corresponding to the target node, a _j represents the probability value that the newly-built base station is close to the jth node of the access chain, and p _i represents the probability value that the newly built base station is close to the jth node of the access chain The path length value of the nearest PTN node on the jth node of , n represents the number of PTN nodes in the access chain, and m represents the number of current-generation network device nodes in the access chain.

In one of the embodiments, the solution acquisition module 205 selects the current-generation network device node with a smaller or smallest expected path value according to the expected path value corresponding to each current-generation network device node, and determines the selected current-generation network device node as the priority It is necessary to place the current generation network device node of the new generation network device.

In one of the embodiments, the new-generation network equipment is PTN equipment, and the current-generation network equipment is SDH equipment.

For the access layer network deployment system provided by the embodiment of the present invention, it should be pointed out that: the above description of the access layer network deployment system is similar to the description of the above access layer network deployment method, and has the above access layer network The beneficial effects of the deployment method are not described in detail in order to save space; therefore, for the technical details not disclosed in the access layer network deployment system provided by the embodiment of the present invention above, please refer to the description of the access layer network deployment method provided above.

The various technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, all possible combinations of the various technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, should be considered as within the scope of this specification.

The above-mentioned embodiments only express several implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but should not be construed as limiting the patent scope of the invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention should be based on the appended claims.

Claims (10)

1. a kind of access layer network dispositions method characterized by comprising

Obtain probability value of the newly-built base station with regard to proximity on each node of the access chain of access layer network；

Assuming that being pre-placed newly on the destination node on the access chain for the network equipment, wherein the destination node is institute State this generation network equipment node on access chain；

Obtain the newly-built base station respectively with regard to proximity on each node the nearest new path for network equipment node of distance Length value, wherein currently new includes existing newly for net on the destination node and the access chain for network equipment node Network device node；

Each path length value according to each probability value and currently obtained determines the corresponding expected path of the destination node Value；

The deployment scheme of the access layer network is obtained for the corresponding expected path value of network equipment node according to each.

2. access layer network dispositions method according to claim 1, which is characterized in that further include:

Judge that each on the access chain is pre-placed newly for whether network equipment node is assumed for the network equipment；

If so, into the deployment side for obtaining the access layer network for the corresponding expected path value of network equipment node according to each The step of case；

If it is not, being then never assumed placement newly for selecting this generation network equipment in this generation network equipment node of the network equipment Node is pre-placed on the destination node on the access chain into the hypothesis and newly sets for network as new destination node Standby step.

3. access layer network dispositions method according to claim 1, it is characterised in that；

The destination node is this generation network equipment node on the main chain of the access chain；

Or

Newly-built base station is all the same with regard to probability value of the proximity on each node of the access chain of access layer network.

4. access layer network dispositions method according to claim 1, it is characterised in that:

According toDetermine the corresponding expected path value of the destination node；

Wherein, Q_iIndicate the corresponding expected path value of the destination node, a_jIndicate the newly-built base station with regard to proximity in the access The probability value of j-th of node of chain, p_jIndicate with regard to proximity nearest new for network of on j-th of node of access chain distance The path length value of device node, n indicate the new number for network equipment node in the access chain, and m indicates the access The number of this generation network equipment node in chain.

5. access layer network dispositions method according to claim 1, which is characterized in that it is described according to each for the network equipment The process for the deployment scheme that the corresponding expected path value of node obtains the access layer network includes:

It is described to be set for network equipment node corresponding the selection of expected path value expected path value the smallest for network according to each This generation network equipment node selected is determined as preecedence requirement and placed newly for this generation network equipment of the network equipment by slave node Node.

6. access layer network dispositions method according to one of claims 1 to 5, which is characterized in that the new generation network is set Standby is PTN device, and described is SDH equipment for the network equipment.

7. a kind of access layer network deployment system characterized by comprising

Probability obtains module, for obtaining probability of the newly-built base station with regard to proximity on each node of the access chain of access layer network Value；

Assuming that module, is pre-placed newly on the destination node on the access chain for the network equipment, wherein described for assuming Destination node is this generation network equipment node on the access chain；

Length obtains module, for obtaining the newly-built base station nearest new for net of distance on each node with regard to proximity respectively The path length value of network device node, wherein currently new includes the destination node and the access for network equipment node It is existing newly for network equipment node on chain；

Processing module, each path length value for according to each probability value and currently obtaining determine the destination node pair The expected path value answered；

Scheme obtains module, for obtaining the access layer network for the corresponding expected path value of network equipment node according to each Deployment scheme.

8. access layer network deployment system according to claim 7, which is characterized in that further include judgment module；

The judgment module is used to judge that each on the access chain to be pre-placed for whether network equipment node is assumed Newly for the network equipment；

The scheme obtains module when the judgement result of the judgment module is to be, corresponding for network equipment node according to each Expected path value obtain the deployment scheme of the access layer network；

The hypothesis module, for also when the judgement result of the judgment module is no, being never assumed placement newly for network This generation network equipment node is selected in this generation network equipment node of equipment as new destination node, re-starts hypothesis The newly process for the network equipment is pre-placed on the destination node on the access chain.

9. access layer network deployment system according to claim 7, it is characterised in that:

The processing module according toDetermine the corresponding expected path value of the destination node；

Wherein, Q_iIndicate the corresponding expected path value of the destination node, a_jIndicate the newly-built base station with regard to proximity in the access The probability value of j-th of node of chain, p_jIndicate with regard to proximity nearest new for network of on j-th of node of access chain distance The path length value of device node, n indicate the new number for network equipment node in the access chain, and m indicates the access The number of this generation network equipment node in chain；

Or

The scheme obtains module and chooses expected path value minimum for the corresponding expected path value of network equipment node according to each This generation network equipment node, by this generation network equipment node selected be determined as preecedence requirement place newly for the network equipment This generation network equipment node.

10. the access layer network deployment system according to one of claim 7 to 9, it is characterised in that；

The destination node is this generation network equipment node on the main chain of the access chain；

Or

Newly-built base station is all the same with regard to probability value of the proximity on each node of the access chain of access layer network；

Or

The new generation network equipment is PTN device, and described is SDH equipment for the network equipment.