Power communication network resource allocation system and method based on optical service unit

Abstract

The invention discloses a power communication network resource allocation system and method based on an optical service unit, and relates to the technical field of power communication networks, and the system comprises an infrastructure layer, a transmission mapping layer and a cooperative control layer. Wherein an OSU transmission channel is deployed between the backbone communication network and the power distribution communication network of the infrastructure layer; the transmission mapping layer is deployed with a multi-service priority mapping mechanism and is used for controlling division of service logic, distributing services to corresponding transmission channels and sending service information to the cooperative control layer; a centralized controller and a distributed controller which are in communication interaction are deployed in the cooperative control layer, the centralized controller is used for generating a global resource configuration and path planning strategy of the power communication network according to received service information, and the distributed controller is used for receiving a strategy instruction issued by the centralized controller and sending the strategy instruction to the centralized controller; and the local link state of the power communication network is monitored and dynamically adjusted in real time.

Description

Technical Field

[0001] The present invention relates to the technical field of power communication networks, and in particular, to a power communication network resource allocation system and method based on an optical service unit. Background Art

[0002] OSU (Optical Service Unit) is an innovative solution based on optical transport network (OTN) technology. Through flexible time slot allocation and hard pipe isolation mechanisms, it provides high-bandwidth, low-latency, and high-reliability transmission capabilities for power communication networks. The OSU technology inherits the advantages of large capacity and long-distance transmission of OTN, and at the same time breaks through the limitations of traditional OTN in time slot granularity and service adaptability, supporting elastic bandwidth access from 2M to 100Gbps, and meeting the differentiated requirements of the power industry for multi-service bearing.

[0003] The resource configuration of traditional power communication networks faces significant bottlenecks in the process of intelligent transformation, relying on a single centralized SDN (Software Defined Network) architecture or a distributed ASON (Automatically Switched Optical Network) architecture. However, both have limitations and are difficult to balance "global optimization" and "local agility", resulting in insufficient network flexibility and low resource scheduling efficiency.

[0004] Therefore, how to optimize the allocation method of power communication network resources and improve the utilization rate and scheduling efficiency of resources has become a technical problem that needs to be urgently solved by those skilled in the art. Summary of the Invention

[0005] The present invention provides a power communication network resource allocation system and method based on an optical service unit, which solves the problem of how to ensure the scheduling efficiency of resources and improve the utilization rate of power communication network resources by coordinating centralized and distributed architectures.

[0006] To solve the above technical problems, an embodiment of the present invention provides a power communication network resource allocation system based on an optical service unit, including: The system includes: an infrastructure layer, a transmission mapping layer, and a collaborative control layer; Wherein, an optical service unit transmission channel is deployed between the backbone communication network and the distribution communication network of the infrastructure layer; The transmission mapping layer is deployed with a multi-service priority mapping mechanism based on an optical service unit, which is used to control the division of service logic to allocate services to the corresponding transmission channels and send service information to the collaborative control layer; The collaborative control layer deploys a centralized controller and a distributed controller for communication interaction. The centralized controller is used to generate the global resource configuration and path planning strategy of the power communication network according to the received service information. The distributed controller is used to receive the policy instructions sent by the centralized controller and monitor and dynamically adjust the local link status of the power communication network in real time.

[0007] Further, the fine-grained bandwidth allocation of the transmission mapping layer uses 2.6 Mb / s as the unit.

[0008] Further, a mapping function for dividing control services and non-control service logics is embedded in the transmission mapping layer.

[0009] Further, the centralized controller is provided with a northbound interface for interacting with the transmission mapping layer to receive the service information sent by the transmission mapping layer.

[0010] Further, a multi-objective optimization function driven by service priority for weight allocation is embedded in the centralized controller. The centralized controller converts the result output by the multi-objective optimization function into an instruction form and sends it to the distributed controller.

[0011] Further, the distributed controller collects the local link status including remaining bandwidth, delay fluctuation, and fault flag at a preset time interval.

[0012] Further, the centralized controller updates and optimizes the global resource configuration and path planning strategy according to the update instructions fed back by the distributed controller.

[0013] Another embodiment of the present invention provides a power communication network resource allocation method based on an optical service unit, which is applied to the above system and includes: Based on the transmission channels built in the infrastructure layer, different types of target services are mapped to the corresponding transmission channels through the transmission mapping layer; the transmission channels include optical channel data channels and shared channels; According to the quality of service characteristics, the collaborative control layer assigns corresponding priorities to the target services received from the transmission channels; Construct a multi-objective optimization function and process it with a preset algorithm; the multi-objective optimization function is designed to dynamically adjust the weights according to the priority allocation result; According to the processing result, the centralized control and distributed control in the collaborative control layer are coordinated to optimize the configuration of the power communication network resources.

[0014] Further, the multi-objective optimization function includes a first function aiming to minimize the comprehensive cost of the path and a second function aiming to maximize the reliability of critical services.

[0015] Further, the collaborative centralized control and distributed control optimize the allocation of power communication network resources, including: When non-critical services burst, adjust the bandwidth according to a preset granularity index; When a link interruption is detected, trigger a fault recovery mechanism.

[0016] Compared with the prior art, the beneficial effects of the embodiments of the present invention are at least one of the following: The embodiments of the present invention consider the optical service unit power communication network architecture with centralized and distributed collaborative management, which can integrate the global optimization of centralized control and the local fast response mechanism of distributed control. By constructing a hierarchical collaborative architecture, the closed-loop optimization of global path planning and local dynamic adjustment is realized. The two interact through a standardized interface to avoid the risk of single-point failure and improve the resource adjustment efficiency in complex scenarios; through the fine-grained optical service unit frame encapsulation and mapping technology and the collaborative service isolation mechanism, the differential bandwidth allocation for control and non-control services is realized, which can meet the needs of diversified services and significantly improve the resource utilization rate and service quality of the power communication network. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of a power communication network resource allocation system based on an optical service unit in one embodiment of the present invention; Figure 2 is a schematic flowchart of a power communication network resource allocation method based on an optical service unit in one embodiment of the present invention; Reference numerals: 1, infrastructure layer; 2, transmission mapping layer; 3, collaborative control layer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0019] In the description of the present application, the terms "first", "second", "third", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", "third", etc. may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise stated, the meaning of "a plurality" is two or more.

[0020] In the description of the present application, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. The terms "vertical", "horizontal", "left", "right", "up", "down" and similar expressions used herein are only for the purpose of illustration, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0021] In the description of the present application, it should be noted that unless otherwise defined, all technical and scientific terms used in the present invention have the same meaning as commonly understood by those of ordinary skill in the technical field to which this technology belongs. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0022] An embodiment of the present invention provides a power communication network resource allocation system based on an optical service unit. Specifically, please refer to Figure 1 , Figure 1 which shows a schematic structural diagram of the power communication network resource allocation system based on an optical service unit in one of the embodiments of the present invention. It can be seen that the architecture of the system includes three main levels: the infrastructure layer 1, the transmission mapping layer 2, and the collaborative control layer 3.

[0023] Among them, an optical service unit (OSU) transmission channel is deployed between the backbone communication network and the distribution communication network in the infrastructure layer 1. It can be understood that in this embodiment, the OSU technology is sampled in the infrastructure layer 1 to build an all-optical network transmission channel between the backbone communication network and the distribution communication network, realizing the integration of the backbone communication network and the terminal communication access network, so as to be able to realize the unified management of optical layer resources. Optical layer resources include wavelength channels, optical fibers, etc. This layer serves as the basis of the entire system architecture and provides a stable transmission channel for the upper-layer services.

[0024] In this embodiment, a multi-service priority mapping mechanism based on OSU is deployed in the transmission mapping layer 2. Through the embedded mapping function, the division of control service and non-control service logics is realized, and various services are allocated to the corresponding transmission channels. Specifically, the mapping function is represented by the following formula: Among them, S is the service set; P is the set of optical data units (ODUk); represents a binary variable indicating whether service i is mapped to channel j (1 means mapped, 0 means not mapped); is a weight function used to comprehensively evaluate the pros and cons of service mapping, and is defined as follows: Among them, represents the priority of service i (the weight of critical services is higher); represents the remaining bandwidth utilization rate of channel j; The higher it is, the more fully the channel has been utilized; is the load factor of channel j (the more hops, the lower the weight value); is the response time of the domain controller, is a weight coefficient used to balance the impacts of priority, bandwidth utilization rate, and load.

[0025] Service mapping is implemented in the transmission mapping layer 2 according to the above mapping function, and further the service information generated in this process is sent to the collaborative control layer 3 to implement resource allocation.

[0026] It can be understood that in this embodiment, the multi-service priority mapping mechanism depends on the OSU frame encapsulation ability, maps different types of service traffic to the appropriate optical data unit (ODUk), and to fully meet the diverse service requirements, that is, control services obtain low-rate and high-reliable bandwidth support, and non-control services provide elastic bandwidth to meet the flexible service change requirements. The preferably set fine-grained bandwidth allocation uses 2.6 Mb / s as the unit.

[0027] Exemplarily, critical control services are preferentially allocated to ODUk channels with protection mechanisms enabled to ensure their high reliability and low latency requirements, while non-critical services are allocated to shared channels without protection mechanisms enabled to isolate different types of service logics and improve network resource utilization.

[0028] Furthermore, a centralized controller and a distributed controller for communication interaction are deployed in the collaborative control layer 3 to collaboratively implement dynamic resource allocation. In the embodiment of the present invention, an SDN (Software Defined Network) centralized controller is selected to perform the centralized control of this layer, and an ASON (Automatically Switched Optical Network) distributed controller is selected to perform the distributed control of this layer.

[0029] Among them, the centralized controller is provided with a northbound interface for interacting with the transmission mapping layer 2, receiving service information sent by the transmission mapping layer, and generating corresponding initial routing policies. The centralized controller performs global resource configuration and path planning for the power communication network according to the received service information, such as the requirements of the service, so as to generate corresponding global resource configuration and path planning policies. It can be understood that the centralized controller is responsible for global resource view construction, cross-domain path planning, and protection resource reservation.

[0030] In this embodiment, the centralized controller is embedded with a multi-objective optimization function driven by service priority weight allocation. The centralized controller can convert the result output by the multi-objective optimization function (i.e., the global resource configuration and path planning policy) into an instruction form and send it to the distributed controller.

[0031] Specifically, in this embodiment, priorities are assigned according to service quality (QoS) characteristics such as the real-time performance, reliability, and bandwidth requirements of the service. Exemplarily, taking the end-to-end delay as an index, tasks with a delay ≤ 50 ms, such as voice communication and relay protection tasks, are set as high-real-time services. Further, taking the packet loss rate and fault recovery time as indexes, tasks with a packet loss rate ≤ 0.1%, such as power control instructions, are set as high-reliability tasks. Taking the bandwidth occupancy rate and burst tolerance as indexes, fixed-bandwidth services are set as tasks with stable bandwidth support. For example, the minimum bandwidth required for a video conference is 10 Mbps. For elastic bandwidth services, such as file transfer, it is set that the bandwidth is allowed to be allocated on demand, such as adjusted in granularity of 2.6 Mb / s.

[0032] According to the above index division results, priorities are set for various services, and high-real-time, high-reliability, and fixed-bandwidth services are assigned high priorities. Low-real-time, low-reliability, and elastic-bandwidth services are assigned low priorities. At that time, network resources will be dynamically allocated according to service priorities to ensure the reliability of critical services.

[0033] Further, this embodiment takes minimizing the comprehensive cost of the path as the main objective and coordinates the secondary objective of maximizing the reliability of critical services to construct a multi-objective optimization function. The construction process is specifically as follows: Among them, the main objective includes path delay, bandwidth cost, and number of hops. Then the first sub-function is expressed as: Among them, S is the service set; P is the path set; is a binary variable indicating whether service i is assigned to path j (1 means assigned, 0 means not assigned); is the delay of path j; is the bandwidth cost of path j; is the number of hops of path j. is the weight coefficient, which is used to balance the impacts of delay, bandwidth cost, and hop count.

[0034] The secondary objectives include preferentially allocating reliable paths for critical services and configuring backup paths. Then, the second sub-function is expressed as: Among them, is the set of critical services; is the set of highly reliable paths; is a binary variable, indicating whether service i configures backup path j.

[0035] Furthermore, adjustment parameters λ and μ are introduced to balance the weights of the two. Increasing μ focuses on reliability optimization, and increasing λ focuses on comprehensive cost optimization. Combining with the optimization mapping, the following comprehensive objective function is formed, that is: It can be understood that the service priority affects the weights of each cost item through the adjustment parameter λ. Exemplarily, high-priority services (such as relay protection) are sensitive to delay, and their existence will increase the weight of the delay item, so low-delay paths are preferentially selected. Low-priority services (such as video surveillance) may relax the delay requirements, reduce λ_delay, and focus on bandwidth cost or hop count optimization. Another example is that high-priority services correspond to higher reliability weight μ to ensure that backup paths are preferentially allocated to them.

[0036] This embodiment will provide the following constraint conditions: (1) Bandwidth allocation constraint The allocated bandwidth of each path cannot exceed its capacity: Among them, is the bandwidth requirement of service i; is the total bandwidth capacity of path j.

[0037] (2) Association constraint between priority and path allocation The path delay selected by each service must meet its delay requirement: Among them, is the delay requirement of service i.

[0038] (3) Path selection constraint Each service must select a primary path and configure at most one backup path: Among them, is a binary variable, indicating whether service i selects path j as the backup path ( = 1 means using path j as the backup path, otherwise = 0) (4) Bandwidth granularity constraint The bandwidth encapsulated by the OSU frame must be an integer multiple of 2.6 Mb / s: Among them, is a set of positive integers; is a positive integer.

[0039] (5) Logical network result constraint: The mapping result affects the path selection. If = 1, it means that service i is mapped to channel j. When selecting a path, it must be ensured that the traffic does not exceed the channel capacity. If = 0, then in the path selection = 0, and this service cannot use channel j.

[0040] Among them: is the result (0 or 1) of whether service i is mapped to channel j of the logical network after optimization of the logical network layer; is the traffic of service i on channel j when selecting a path; is the total capacity of channel j.

[0041] (6) Consistency constraint of global and local resources The global resources of the centralized planning need to match the actual capabilities of the distributed nodes Among them, is the remaining bandwidth; is the global resource bandwidth.

[0042] Preferably, in this embodiment, a multi-objective integer quadratic programming (MO-IQP) model is used to solve the above multi-objective function. According to the solution results, a global resource allocation strategy and a path planning strategy are formulated and sent to the corresponding distributed controllers for implementation.

[0043] In some embodiments of the present invention, ASON distributed controllers are deployed inside the domains of CPN, AN, AggN, and CN to receive instructions containing global resource allocation and path planning strategy information sent by the centralized controller, and to monitor and dynamically adjust the local link status of the power communication network in real time. It can be understood that the local link status includes the remaining bandwidth, delay fluctuation, and fault flag.

[0044] The distributed controller collects the remaining bandwidth, delay fluctuation, and fault flag within the domain at a preset time interval, such as every 5 seconds. Execute the instructions issued by the centralized controller, and dynamically adjust path parameters such as re-routing and bandwidth adjustment according to the local resource status. Preferably, in this embodiment, the centralized controller and the distributed controller interact through a RESTful API interface, and the RESTful API is an application programming interface. In some embodiments of the present invention, the distributed controller will feedback the monitored local resource status information to the centralized controller, and according to the execution instructions issued again by the centralized controller, a local fast response mechanism will be implemented, such as dynamic bandwidth adjustment and fault recovery execution.

[0045] After updating the local resource view, the distributed controller will further feedback an update instruction to the centralized controller, so that the centralized controller can update and optimize the global resource configuration and path planning strategy.

[0046] The updated policy is sent to each distributed controller through the embedded standardized interface. Exemplarily, if the distributed controller reports a major fault (such as a backbone link interruption), the centralized controller will immediately start an emergency optimization mode, suspend the transmission of non-critical services, release bandwidth resources, and preferentially allocate high-reliability paths for critical services. And ensure a recovery at the 50ms level through the 1+1 SNCP protection mechanism, and finally realize the path and resource planning of the global power communication network.

[0047] In summary, by integrating the centralized and distributed collaborative management mechanism and the fine-grained resource allocation ability of the OSU technology, the performance and efficiency of the power communication network are significantly improved. Through the fine-grained OSU frame encapsulation and mapping technology, differential bandwidth allocation for control and non-control services is realized, meeting the needs of diversified services; based on the service isolation scheme at the logical network layer, the isolation and reliability between different service types are enhanced; the closed-loop optimization mechanism of SDN and ASON collaboration ensures the key service delay fluctuation, meets the millisecond-level real-time control requirements, supports the dynamic adaptation of resources in complex scenarios, effectively avoids the risk of single-point failure, and provides an efficient and reliable solution for the diversified service bearing in complex power communication networks.

[0048] Another embodiment of the present invention provides a method for allocating resources in a power communication network based on an optical service unit. Specifically, please refer to Figure 2 , Figure 2 which shows a schematic flow diagram of a method for allocating resources in a power communication network based on an optical service unit in one of the embodiments of the present invention, including the following steps: S1. Based on the transmission channels built at the infrastructure layer, map different types of target services to the corresponding transmission channels through the transmission mapping layer; the transmission channels include optical channel data channels and shared channels; S2. According to the service quality characteristics, the collaborative control layer assigns corresponding priorities to the target services received from the transmission channels. S3. Construct a multi-objective optimization function and process it with a preset algorithm; the multi-objective optimization function is designed to dynamically adjust the weights according to the priority assignment results. S4. According to the processing results, collaborate the centralized control and distributed control in the collaborative control layer to optimize the allocation of power communication network resources.

[0049] In this embodiment, the multi-objective optimization function includes a first function aiming to minimize the comprehensive cost of the path and a second function aiming to maximize the reliability of critical services.

[0050] Exemplarily, in this embodiment, the optimization of the allocation of power communication network resources by the centralized control and distributed control in the collaborative control layer can be as follows: When non-critical services burst, adjust the bandwidth with a preset granularity metric, and when a link interruption is detected, trigger a fault recovery mechanism.

[0051] Exemplarily, for example, when non-critical services burst, reduce its bandwidth by 2.6 Mb / s granularity, the adjustment result takes effect in real time, and the local resource view is updated synchronously. It is expressed as follows: where, is the updated bandwidth requirement of service i.

[0052] In addition, for a fault, after a link interruption is detected, trigger local protection switching within 50 ms.

[0053] The above embodiments only represent several implementation manners of the present invention, and the description thereof is relatively specific and detailed, but it should not be construed as a limitation to the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the appended claims.

Claims

1. A power communication network resource allocation system based on an optical service unit, characterized in that The system includes: an infrastructure layer, a transmission mapping layer, and a collaborative control layer; Among them, an optical service unit transmission channel is deployed between the backbone communication network and the distribution communication network of the infrastructure layer; The transmission mapping layer is deployed with a multi-service priority mapping mechanism based on optical service units, which is used to control the division of service logic to allocate services to the corresponding transmission channels and send service information to the collaborative control layer; The collaborative control layer is deployed with a centralized controller and a distributed controller for communication interaction. The centralized controller is used to generate a global resource configuration and path planning strategy for the power communication network according to the received service information. The distributed controller is used to receive the policy instructions issued by the centralized controller and monitor and dynamically adjust the local link status of the power communication network in real time.

2. The power communication network resource allocation system based on an optical service unit according to claim 1, characterized in that The fine-grained bandwidth allocation of the transmission mapping layer uses 2.6 Mb / s as the unit.

3. The power communication network resource allocation system based on an optical service unit according to claim 1, wherein A mapping function for dividing control service and non-control service logic is embedded in the transmission mapping layer.

4. The power communication network resource allocation system based on an optical service unit according to claim 1, wherein The centralized controller is provided with a northbound interface for interacting with the transmission mapping layer, which is used to receive the service information sent by the transmission mapping layer.

5. The power communication network resource allocation system based on an optical service unit according to claim 1, characterized in that, The centralized controller is embedded with a multi-objective optimization function driven by service priority to allocate weights. The centralized controller converts the result output by the multi-objective optimization function into an instruction form and sends it to the distributed controller.

6. The power communication network resource allocation system based on an optical service unit according to claim 1, wherein The distributed controller collects the local link status including remaining bandwidth, delay fluctuation, and fault flag at a preset time interval.

7. The power communication network resource allocation system based on an optical service unit according to claim 1, characterized in that The centralized controller updates and optimizes the global resource configuration and path planning strategy according to the update instructions fed back by the distributed controller.

8. A method for allocating resources in a power communication network based on an optical service unit, characterized in that, Applied to the power communication network resource allocation system based on optical service units as described in claims 1 to 7, it includes: Based on the transmission channels built by the infrastructure layer, different types of target services are mapped to the corresponding transmission channels through the transmission mapping layer; the transmission channels include an optical channel data channel and a shared channel; According to the service quality characteristics, the collaborative control layer assigns corresponding priorities to the target services received from the transmission channels; Construct a multi-objective optimization function and process it with a preset algorithm; the multi-objective optimization function is designed to dynamically adjust the weights according to the priority allocation result; According to the processing result, coordinate the centralized control and distributed control in the collaborative control layer to optimize the configuration of the power communication network resources.

9. The method for allocating power communication network resources based on an optical service unit according to claim 8, wherein, The multi-objective optimization function includes a first function aiming at minimizing the comprehensive cost of the path and a second function aiming at maximizing the reliability of critical services.

10. A method for allocating power communication network resources based on an optical service unit as claimed in claim 8, wherein, The coordination of the centralized control and distributed control to optimize the configuration of the power communication network resources includes: When non-critical services burst, the bandwidth is adjusted with a preset granularity index; When a link interruption is detected, a fault recovery mechanism is triggered.

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