CN114650296B - Information center network copy selection method - Google Patents
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- CN114650296B CN114650296B CN202011508971.9A CN202011508971A CN114650296B CN 114650296 B CN114650296 B CN 114650296B CN 202011508971 A CN202011508971 A CN 202011508971A CN 114650296 B CN114650296 B CN 114650296B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/10—Protocols in which an application is distributed across nodes in the network
- H04L67/1001—Protocols in which an application is distributed across nodes in the network for accessing one among a plurality of replicated servers
- H04L67/1004—Server selection for load balancing
- H04L67/1008—Server selection for load balancing based on parameters of servers, e.g. available memory or workload
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/10—Protocols in which an application is distributed across nodes in the network
- H04L67/1001—Protocols in which an application is distributed across nodes in the network for accessing one among a plurality of replicated servers
- H04L67/1004—Server selection for load balancing
- H04L67/101—Server selection for load balancing based on network conditions
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/10—Protocols in which an application is distributed across nodes in the network
- H04L67/1001—Protocols in which an application is distributed across nodes in the network for accessing one among a plurality of replicated servers
- H04L67/1004—Server selection for load balancing
- H04L67/1021—Server selection for load balancing based on client or server locations
Abstract
The invention belongs to the technical field of computer networks and communication, and particularly relates to a method for selecting a network copy of an information center, which comprises the following steps: according to the distance between the data request entity and the replica source end node, different node state information maintenance and selection strategies are adopted, and the replica source end node in the distance constraint range among the nodes is preferentially selected to initiate a transmission request of the data block; aiming at a copy source end node in a distance constraint range between nodes, a data request entity maintains a node state table locally for the copy source end node; the data request entity selects a copy source end node with the best state to initiate a transmission request of the data block according to the node state value, and updates the corresponding node state value by acquiring data transmission information; and aiming at the replica source end nodes outside the distance constraint range among the nodes, the node state table information is not maintained, and the replica nodes are selected only through the network distance.
Description
Technical Field
The invention belongs to the technical field of computer networks and communication, and particularly relates to a method for selecting a network copy of an information center.
Background
An Information Centric Networking (ICN) is a new network model, which is one of the research directions of future network architectures, and the network model no longer focuses on the traditional end-to-end transmission mode, but focuses on data acquisition. The ICN network decouples the identification and the address, and utilizes the in-network cache characteristic, thereby facilitating information distribution. ICN networks typically break up data objects (data objects) into smaller blocks of data by default, each identified by a unique name EID for addressing and caching.
Since the data blocks of an ICN network are identified by location independent EIDs rather than locators (e.g., IP), EIDs and IP mappings are required, referred to as a name resolution system. ICN network evolution has now derived a number of related projects, which mainly include two name resolution approaches: name-Based Routing approach (NBR) and independent Name Resolution approach (SNR). Among them, the NBR method generally uses hierarchical and aggregated names, and the name resolution process is combined with message routing, such as NDN. In the SNR method, the two functions of name resolution and message routing are decoupled, and usually planar names are used to find their locators, and then the locators are used for routing (the locator IP corresponding to the name EID is queried by the name resolution system, and then the locator IP is used for routing), such as MobilityFirst.
When multiple copies of data blocks exist in the ICN network, how to select the optimal ICN network copy node for data service is a problem worthy of study. In the existing method, nearby copy nodes, such as MobilityFirst, are selected in a global scope, the information maintenance cost is high, and the nearby copies are not necessarily optimal copies; in addition, the existing method can only select from replica nodes of paths of consumers and data publishing sources, such as NDN, and can not discover superior replica nodes outside the paths. In addition, the existing method cannot optimally select the duplicate source end node, cannot balance the load of the data service source, cannot avoid network congestion, reduces the overall network throughput, increases the data transmission delay time, and reduces the data transmission efficiency.
Disclosure of Invention
In order to solve the above-mentioned defects existing in the prior art, the invention provides an information center network copy selection method, which is used for solving the problem of how to select a copy source end node after a data request entity inquires and acquires a network address list of multiple copies from a name resolution system according to a data block identifier, an ICN network divides an object into multiple data blocks, and the data request entity inquires and acquires the network address list of the multiple copies from the name resolution system according to the data block identifier and then selects the copy source end node, and is characterized in that the method comprises the following steps:
according to the distance between the data request entity and the replica source end node, different node state information maintenance and selection strategies are adopted, and the replica source end node in the distance constraint range among the nodes is preferentially selected to initiate a transmission request of the data block;
aiming at a copy source end node in a distance constraint range between nodes, a data request entity maintains a node state table locally for the copy source end node; the entries of the node state table include: copying the network address and the node state value of the source end node;
the node state value is obtained through comprehensive calculation according to the node load degree of the replica source end node, the network distance from the data request entity to the replica source end node and the path congestion degree of a transmission path;
the data request entity selects a copy source end node with the best state to initiate a transmission request of the data block according to the node state value, and updates the corresponding node state value by acquiring data transmission information;
aiming at the replica source end nodes outside the distance constraint range among the nodes, the node state table information is not maintained, and the replica nodes are selected only through the network distance;
the distance constraint range between nodes can be, but is not limited to, obtained by a field name resolution system and a global name resolution system.
As an improvement of the above technical solution, the data request entity includes an edge network device located at a junction between the information center network and another network; wherein, the edge network device at the other network boundary may be, but is not limited to, a gateway or an edge router;
the data request entity also comprises information center network terminal user equipment.
As an improvement of the above technical solution, the name resolution system receives a name resolution request from a data requesting entity, and request parameters of the name resolution request include: the data block identification information responds to a network address list of a copy source end node corresponding to the data block identification;
the name resolution system comprises: a field name resolution system and a global name resolution system;
the on-site name resolution system comprises a plurality of on-site name resolution nodes and a plurality of source end nodes, wherein the on-site name resolution nodes are used for providing name resolution service with exact distance constraint, so that an on-site resolution result obtained by a data request entity only comprises a copy source end node within the distance constraint range between the nodes;
the global name resolution system comprises a plurality of global name resolution nodes and is used for providing name resolution service of the whole ICN network, so that a global resolution result obtained by a data request entity is contained in a copy source end node of the whole ICN network;
the field name resolution node and the global name resolution node are resolution nodes; the distance constraint range of the field name resolution system is determined by time delay between nodes; the field analysis result is that the replica source node with the highest state value in the state table of the matched replica node in the node distance constraint range is used as a data service node; and the global analysis result is that the copy source end node which is out of the node distance constraint range and closest to the network distance of the data request entity in the whole ICN serves as a data service node.
As an improvement of the above technical solution, the process of acquiring the field analysis result is as follows:
initiating a name resolution query request to a field name resolution node;
judging whether an analysis query result list in a distance constraint range returned by the field name analysis node is empty or not;
if the analysis query result list is not empty, turning to the next step;
maintaining a node state table of a copy source end node corresponding to the network address list of the analysis result;
matching the replica source node with the highest state value in the replica node state table in the analysis result list to serve as a data service node, and sending a data request;
if the analysis query result list is empty, a name analysis query request is sent to the global name analysis node;
judging whether an analysis result list returned by the global name analysis node is empty or not, and if the returned analysis result list is not empty, turning to the next step; if the returned analysis result list is empty, returning the source end node without the service copy;
and selecting a copy source end node with the closest network distance in the global name resolution result list as a data service node, and sending a data request.
As an improvement of the above technical solution, the node load degree is determined by the service response time of the replica source node and the service load number of the data blocks of the replica source node.
As an improvement of the above technical solution, the node load degree is obtained by calculating a product of a service response time of the replica source node and a service load number of the data block of the replica source node.
As an improvement of the above technical solution, the network distance is a hop count or a round trip delay.
As an improvement of the above technical solution, the path congestion degree is determined by a queuing delay of the data packet in the transmission path;
the queuing delay can be calculated by subtracting the historical minimum transmission delay from the current transmission delay.
As an improvement of the above technical solution, the acquiring of the data transmission information includes: the data request entity actively detects a data transmission path and a copy source end node; further comprising: feedback information for each actual data transmission process.
Compared with the prior art, the invention has the beneficial effects that:
the method of the invention considers the characteristic that the data block identification is fixed and invariable in the transmission process, utilizes the copy selection strategy based on the information of node load degree, network distance, path congestion degree and the like, fully utilizes the local characteristic brought by field name analysis in the name analysis system, limits the data transmission flow in the network in the local area as much as possible, selects the copy source end node in the area, and performs copy selection by maintaining the information of three parameters of the network distance between the nodes, the load degree of the copy node and the congestion degree of the transmission path between the nodes, thereby embodying the scheduling of finer granularity. Compared with the existing method, the method has the advantages that various aspects of information of the network distance between the nodes, the load degree of the replica nodes and the congestion degree of the transmission path between the nodes are fully utilized, the maintenance task is unloaded to the edge, the calculation capacity of edge equipment (the calculation capacity of an edge router) can be effectively utilized, the node state table is maintained, the congestion condition in the network is improved, the load balance of data service is realized, the throughput of the whole network is effectively improved, the data transmission delay time is reduced, and the selection of the information center network replica is completed.
Drawings
FIG. 1 is a flow chart of an information centric network replica selection method of the present invention;
fig. 2 is a schematic view of a scene implementation of the information center network replica selection method according to the present invention.
Detailed Description
The invention will now be further described with reference to the accompanying drawings.
As shown in fig. 1, the present invention provides a method for selecting a copy of an information-centric network, in which an ICN network divides content into a plurality of data blocks, and a data request entity queries and obtains a network address list of a plurality of copies from a name resolution system according to the data block identifiers, and then selects a copy source node, the method including:
according to the distance between the data request entity and the replica source end node, different node state information maintenance and selection strategies are adopted, and the replica source end node in the distance constraint range among the nodes is preferentially selected to initiate a transmission request of the data block;
aiming at a copy source end node in a distance constraint range between nodes, a data request entity maintains a node state table locally for the copy source end node; the entries of the node state table include: copying the network address and the node state value of the source end node;
the method comprises the steps that a node state value is obtained through comprehensive calculation according to the node load degree of a replica source end node, the network distance from a data request entity to the replica source end node and the path congestion degree of a transmission path;
the data request entity selects a copy source end node with the best state to initiate a transmission request of the data block according to the node state value, and updates the corresponding node state value by acquiring data transmission information;
aiming at the replica source end nodes outside the distance constraint range among the nodes, the node state table information is not maintained, and the replica nodes are selected only through the network distance;
the distance constraint range between the nodes can be, but is not limited to, obtained by a field name resolution system and a global name resolution system. Wherein the inter-node distance constraint is the distance between the data request entity and the replica source node. For example, those duplicate source end nodes around the data requesting entity within 10 hops of the network or within 50ms of the latency. Here, the data requesting entity is started, and the duplicate source nodes within a specific distance constraint range between the data requesting entity and the data requesting entity are obtained through respective resolving nodes (namely third-party nodes).
The data request entity comprises edge network equipment located at the junction of an information center network and other networks; wherein, the edge network device at the other network boundary may be, but is not limited to, a gateway or an edge router;
the data request entity also comprises information center network terminal user equipment.
The name resolution system receives a name resolution request from a data request entity, and request parameters of the name resolution request comprise: the data block identification information responds to a network address list of a copy source end node corresponding to the data block identification;
the name resolution system comprises: a field name resolution system and a global name resolution system;
the field name resolution system comprises a plurality of field name resolution nodes and a plurality of source end nodes, wherein the field name resolution nodes are used for providing name resolution service with exact distance constraint between the nodes, so that a field resolution result obtained by a data request entity only contains copy source end nodes within the distance constraint range between the nodes;
the global name resolution system comprises a plurality of global name resolution nodes and is used for providing name resolution service of the whole ICN network, so that a global resolution result obtained by a data request entity is only contained in a copy source end node in the whole ICN network;
the name resolution system is a distributed system and comprises a field name resolution system and a global name resolution system, wherein the field name resolution system and the global name resolution system can provide a distance constraint range between nodes; and the field name analysis node and the global name analysis node are analysis nodes. The data request entity can perform name resolution query service through one or more resolution nodes serving the data request entity.
The distance constraint range of the field name resolution system is determined by time delay between nodes; the on-site analysis result is that the replica source node with the highest state value in the matched replica node state table is used as a data service node; and the global analysis result is that the copy source end node closest to the network in the whole ICN is used as a data service node.
Specifically, if the replica source end node list is obtained from the field name resolution system, it indicates that the serviceable replica source end node in the list is within the distance constraint range between nodes of the data request entity, and therefore, the replica selection is further matched with the replica node state table from the replica source end node list, and the selection of the information network replica and the issuance of the service request are completed.
If the analysis query result of the field name analysis system is null, the data block with the request does not exist in the distance constraint range between the nodes of the data request entity (the data block is distinguished by the data block identifier), so the global name analysis system needs to be queried to obtain the copy source end nodes outside the distance constraint range between the nodes in the whole ICN network, and the copy far-point node closest to the data request entity is selected as the data service node to send out the data block service request.
Specifically, the process of acquiring the field analysis result is as follows:
initiating a name resolution query request to a field name resolution node;
judging whether an analysis query result list in a distance constraint range returned by the field name analysis node is empty or not;
if the analysis query result list is not empty, turning to the next step;
maintaining a node state table of a copy source end node corresponding to the network address list of the analysis result;
matching the replica source node with the highest state value in the replica node state table in the analysis result list to serve as a data service node, and sending a data request;
if the analysis query result list is empty, a name analysis query request is sent to the global name analysis node;
judging whether an analysis result list returned by the global name analysis node is empty, and if the returned analysis result list is not empty, turning to the next step; if the returned analysis result list is empty, returning the source end node without the service copy;
and selecting a copy source end node with the closest network distance in the global name resolution result list as a data service node, and sending a data request.
The node load degree is determined by the service response time of the replica source end node and the service load number of the data block of the replica source end node;
specifically, the node load degree is obtained by calculating the product of the service response time of the replica source end node and the service load number of the data block of the replica source end node.
The network distance is a hop count or a round trip delay.
The path congestion degree is determined by queuing delay of the data message in a transmission path;
the queuing delay can be calculated by subtracting the historical minimum transmission delay from the current transmission delay.
The acquisition of the data transmission information comprises: the data request entity actively detects a data transmission path and a copy source end node; further comprising: feedback information for each actual data transmission process.
As shown in fig. 1, the specific process of the ICN network copy selection method is as follows:
step 1) initiating a name resolution query request to a field name resolution node;
step 2) judging whether an analysis query result list in a distance constraint range returned by the site name analysis node is empty, and if the returned analysis query result list is not empty, turning to the step 3); if the returned analysis query result list is empty, turning to the step 5);
step 3) maintaining a node state table of a copy source end node corresponding to the network address list of the analysis result;
step 4) matching the replica source node with the highest state value in the replica node state table in the analysis result list as a data service node, and turning to step 8);
step 5) sending a name resolution query request to a global name resolution node;
step 6) judging whether an analysis result list returned by the global name analysis node is empty, and if the returned analysis query result list is not empty, turning to the step 7); if the returned analysis query result list is empty, returning the source end node without the servable copy;
step 7) selecting a copy source end node with the closest network distance in the global name resolution result list as a data service node, and turning to step 8);
step 8) initiates a data request.
In step 3), the entry of the node state table includes: copying the network address and the node state value of the source end node;
the method comprises the steps that a node state value is obtained through comprehensive calculation according to the node load degree of a replica source end node, the network distance from a data request entity to the replica source end node and the path congestion degree of a transmission path;
specifically, the method for calculating the node state value includes:
Value＝f(Hops,Load,Congestion)
wherein Value is a node state Value; f () can be flexibly defined by an optimization goal; hops is the network distance between nodes; load is the Load degree of the replica node; congestion is the Congestion degree of a transmission path between nodes;
and evaluating the state of the replica source end node by integrating three types of parameters, preferably, the calculation method is as follows:
Value＝α*Hops+β*Load+γ*Congestion
wherein α, β, γ ∈ (0, 1), α + β + γ =1.
The data request entity selects a copy source end node with the best state to initiate a transmission request of the data block according to the node state value, and updates the corresponding node state value by acquiring data transmission information;
as shown in fig. 2, a specific embodiment example of a copy selection method for an ICN network includes the following steps:
(1) After the data release source generates the data blocks divided by the object, the data block chunk1 is released;
(2) The end User1 requests to obtain chunk1, constructs a data request message request #1 of a data identifier EID1, an analysis limit condition RTT <200ms and a network address with a destination address as a data issuing source, namely the data request message comprises: data block identification (ID 1), distance constraint range of field name resolution, also called a limit condition (200 ms), and a destination address as a network address of a data distribution source (here, an IP address of a source in FIG. 2); after receiving the data request message, the edge router NA6 initiates an analysis request of EID1 to a field analysis node ENRS1, and if the field analysis node 1 detects that no data source node storing chunk1 exists within RTT (round trip time) of less than 200ms, returns a field analysis result as null; the edge router will continue to initiate an ID1 parsing query request to a global name parsing node (not shown in FIG. 2), and receive only one global parsing result (if not, select one using a policy with the closest network distance) as a source network address; the network address of the source is unified with the original destination address of the request message request #1, so that the edge router NA6 receiving the request #1 directly forwards the data message without modifying the destination address of the data request message; the data issuing source replies to chunk1 after receiving the request; assuming that all routers with caching capability in the transmission path cache the data block successfully, namely NA1, NA4, and NA6 cache chunk1;
(3) The method comprises the steps that a terminal User2 requests to obtain chunk1, an edge router NA5 receives a data request message request # 2 with a destination address being the network address of the chunk1, initiates request analysis for analyzing EID1 to a field analysis node ENRS1, receives NA4 and NA6, caches the network address of the router with the data block chunk1, inquires state values of NA4 and NA6 in a node state table, namely 7.4 and 8.1, and initiates a data request to NA4 with the best state (namely the lowest state value);
(4) The edge router NA5 updates the node state table according to the feedback information of the transmission result. All edge routers in the ICN network maintain the node state table and perform a complete copy selection operation.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. An ICN network divides an object into a plurality of data blocks, and a data request entity inquires and acquires a network address list of a plurality of copies from a name resolution system according to the data block identification and then selects a copy source end node, wherein the method comprises the following steps:
according to the distance between the data request entity and the replica source end node, different node state information maintenance and selection strategies are adopted, and the replica source end node in the distance constraint range among the nodes is preferentially selected to initiate a transmission request of the data block;
aiming at a copy source end node in a distance constraint range between nodes, a data request entity maintains a node state table locally for the copy source end node; the entries of the node state table include: copying the network address and the node state value of the source end node;
the node state value is obtained through comprehensive calculation according to the node load degree of the replica source end node, the network distance from the data request entity to the replica source end node and the path congestion degree of a transmission path;
the data request entity selects a copy source end node with the best state to initiate a transmission request of the data block according to the node state value, and updates the corresponding node state value by acquiring data transmission information;
aiming at the replica source end nodes outside the distance constraint range among the nodes, the node state table information is not maintained, and the replica nodes are selected only through the network distance;
the distance constraint range between the nodes is obtained through a field name resolution system and a global name resolution system; the distance constraint between the nodes is the distance between the data request entity and the replica source end node, and is used for identifying the replica source end node within the hop range or the delay range of the network distance around the data request entity.
2. The information-centric network replica selection method according to claim 1, wherein the data request entity comprises an edge network device located at a junction of the information-centric network and another network; wherein the edge network device at the other network boundary is a gateway or an edge router;
the data request entity also comprises information center network terminal user equipment.
3. The information-centric network replica selection method of claim 1, wherein the name resolution system receives a name resolution request from a data requesting entity, request parameters of the name resolution request comprising: the data block identification information responds to a network address list of a copy source end node corresponding to the data block identification;
the name resolution system comprises: a field name resolution system and a global name resolution system;
the on-site name resolution system comprises a plurality of on-site name resolution nodes and a plurality of source end nodes, wherein the on-site name resolution nodes are used for providing name resolution service with exact distance constraint, so that an on-site resolution result obtained by a data request entity only contains duplicate source end nodes within the distance constraint range between the nodes;
the global name resolution system comprises a plurality of global name resolution nodes and a copy source end node, wherein the global name resolution nodes are used for providing name resolution service of the whole ICN network, so that a global resolution result obtained by a data request entity is contained in the whole ICN network;
the field name resolution node and the global name resolution node are resolution nodes; the distance constraint range of the field name resolution system is determined by time delay between nodes; the field analysis result is that the replica source node with the highest state value in the matching replica node state table in the node distance constraint range is used as a data service node; and the global analysis result is that the copy source end node which is out of the node distance constraint range and closest to the network distance of the data request entity in the whole ICN serves as a data service node.
4. The information center network replica selection method according to claim 3, wherein the process of obtaining the field analysis result is as follows:
initiating a name resolution query request to a field name resolution node;
judging whether an analysis query result list in a distance constraint range returned by the field name analysis node is empty or not;
if the analysis query result list is not empty, turning to the next step;
maintaining a node state table of a copy source end node corresponding to the network address list of the analysis result;
matching the replica source node with the highest state value in the replica node state table in the analysis result list to serve as a data service node, and sending a data request;
if the analysis query result list is empty, a name analysis query request is sent to the global name analysis node;
judging whether an analysis result list returned by the global name analysis node is empty, and if the returned analysis result list is not empty, turning to the next step; if the returned analysis result list is empty, returning the source end node without the service copy;
and selecting a copy source end node with the closest network distance in the global name resolution result list as a data service node, and sending a data request.
5. The information-centric network replica selection method of claim 1, wherein the node load degree is determined by a service response time of the replica source node and a data block service load number of the replica source node.
6. The information-centric network replica selection method of claim 5, wherein the node load degree is calculated from a product of a service response time of the replica source node and a data block service load number of the replica source node.
7. The information-centric network replica selection method according to claim 1, wherein the network distance is a hop count or a round trip delay.
8. The method of claim 1, wherein the path congestion level is determined by a queuing delay of the data packet in the transmission path;
and the queuing delay is obtained by subtracting the historical minimum transmission delay from the current transmission delay.
9. The information-centric network replica selection method according to claim 1, wherein the collecting of the data transmission information comprises: the data request entity actively detects a data transmission path and a copy source end node; further comprising: feedback information of each actual data transmission process.
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