CN114697347A - Data transmission system with network internal storage capability - Google Patents

Data transmission system with network internal storage capability Download PDF

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Publication number
CN114697347A
CN114697347A CN202011473017.0A CN202011473017A CN114697347A CN 114697347 A CN114697347 A CN 114697347A CN 202011473017 A CN202011473017 A CN 202011473017A CN 114697347 A CN114697347 A CN 114697347A
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node
data
network
message
data block
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CN114697347B (en
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王劲林
邓浩江
尤佳莉
韩锐
程钢
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Zhongkehai Suzhou Network Technology Co ltd
Institute of Acoustics CAS
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Zhongkehai Suzhou Network Technology Co ltd
Institute of Acoustics CAS
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Priority to PCT/CN2022/073398 priority patent/WO2022127938A1/en
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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
    • H04L67/1097—Protocols in which an application is distributed across nodes in the network for distributed storage of data in networks, e.g. transport arrangements for network file system [NFS], storage area networks [SAN] or network attached storage [NAS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/40—Support for services or applications
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/22—Parsing or analysis of headers

Abstract

The invention discloses a data transmission system with network memory capacity, which comprises a data request node, a data source service node and an intermediate transmission node, wherein each node has a unique Identification (ID) of the whole network, at least has a Network Address (NA) and is provided with a unit for processing a transmission layer protocol message based on the ID; the data request node is used for generating and sending a data request message and receiving a data response message; the data source service node is used for responding to the data request, providing a sending service of the data block content when the data block with the ID identification is stored in the node, and generating and sending a data response message; the intermediate transmission node is used for processing the ID-based transport layer protocol message, has a self-decision data storage function, can decide subsequent processing behaviors from the information acquired from the message and the network state of the node, can respond to a data request, provides a sending service of the content of the data block when the data block identified by the ID is stored in the node, and generates and sends a data response message.

Description

Data transmission system with network internal storage capability
Technical Field
The invention relates to a computer network technology, in particular to a data transmission system with network storage capacity.
Background
With the rapid development of the internet of things and the mobile internet, the existing IP network technology system integrating the IP identifier and the address gradually shows inherent defects in the aspects of mobility, expansibility, data distribution efficiency and the like. An Information Centric Network (ICN) technology which is characterized by separation of identification and address realizes content near service based on in-Network cache, and provides an efficient and flexible data acquisition mode for handling massive data processing in eMBB, URLLC and mMTC scenes in a 5G novel mobile Network. In the ICN network, the intermediate transmission node may also serve as a response node for content requests, so that the transmission system based on the conventional end-to-end transport layer protocol cannot be applied to the ICN network.
A Named Data Network (NDN) or a Content Centric Network (CCN) is used as an ICN, is addressed based on a name hop-by-hop route, is a subversive architecture coupling addressing and routing, and is difficult to deploy and evolve in the existing Network; another addressing and routing decoupling manner, such as a MobilityFirst architecture, maps a Network entity and a data name to an Identifier (ID, Identifier), and binds the ID with a Network Address (NA, Network Address) attached to the ID, where the ID is used for addressing and the NA is used for routing, and is compatible with an existing Network architecture, such as an IP Network, and has an existing Network implementability. Therefore, on the premise of being compatible with the existing network routing mechanism, how to fully utilize the storage and calculation capabilities of the transmission nodes in the middle of the network and provide a data transmission system with the network storage capability is an urgent problem to be solved.
Disclosure of Invention
The invention aims to solve the problems and provides a data transmission system with network storage capacity, which comprises a data request node, a data source service node and an intermediate transmission node, wherein each node has a network-wide unique Identifier (ID), at least one Network Address (NA) and a unit for processing a transmission layer protocol message based on the ID, and a transmission object of the data transmission system is a data block with the network-wide unique ID;
the data request node is used for generating and sending a data request message and receiving a data response message;
the data source service node is used for responding to the data request, providing a sending service of the content of the data block when the data block with the ID identification is stored in the node, and generating and sending a data response message;
the intermediate transmission node is used for processing an ID-based transport layer protocol message, has a self-decision data storage function, can decide subsequent processing behaviors from information acquired from the message and a network state of the node, can respond to a data request, provides a sending service of the content of a data block when the node stores the data block identified by the ID, and generates and sends a data response message.
As an improvement of the above system, the header field of the ID-based transport layer protocol packet includes, but is not limited to, a data block ID, a data request node ID, a source address, a destination address, a packet type, and a decision processing indication field; the data block ID and the data request node ID are kept unchanged in the transmission process, the message types include but are not limited to a data request message and a data response message, and the decision processing indication field includes but is not limited to a preference indication field, a cache indication field, a QoS indication field and a combination thereof; the corresponding indication information contained in the decision processing indication field is not limited to be transmitted through a message field, and can also be transmitted through a message load.
As an improvement of the above system, the source address in the data request message is the network address of the data requesting node corresponding to the data requesting node ID, the destination address is the address of the node which stores the data block identified by the data block ID and can provide the data block content transmission service, and the destination address changes during transmission according to the node providing the transmission service and the change of the network address thereof.
As an improvement of the above system, the source address of the data response message is the address of the node which stores the data block identified by the data block ID and can provide the service of sending the content of the data block; the destination address is an address of the data requesting node corresponding to the data requesting node ID, wherein the source address varies in transmission according to a change of the node providing the transmission service and its network address.
As an improvement of the above system, the value of the preference indication field expresses the optimal network location indication information for caching or storing the data block, including but not limited to, being close to the data request node, being close to the data source, being close to the network core, and combinations;
the numerical value of the cache indication field expresses cache behavior indication information of the data block content in the message to which the field belongs on a transmission path, and the cache behavior indication information comprises but is not limited to the number of times that the data block is cached on the transmission path and the number of times that the data block needs to be cached;
the value of the QoS indication field expresses QoS requirement indication information of the data block contents during transmission, buffering and storage, including but not limited to delay, throughput and reliability.
As an improvement of the above system, the intermediate transmission node is provided with a decision unit, the input of which is a transmission processing information set and a network state set of the node, and the output of which is used for deciding whether to execute a corresponding post-processing action.
As an improvement of the above system, the transmission processing information set is composed of information obtained by the intermediate transmission node through message parsing, including but not limited to message header field information and indication information transmitted in the message load; the network state set comprises the self state and the adjacent node state of the intermediate transmission node; the self state is used for indicating the self resource providing capability of the current intermediate transmission node, including but not limited to available cache space, available storage space and available bandwidth; the neighboring node status is used for indicating the relevant status information of other neighboring intermediate transmission nodes of the current intermediate transmission node, including but not limited to the network address, the available storage space and the network distance to the node of the neighboring intermediate transmission node; the number of other intermediate transmission nodes in the neighborhood is not limited to 1, and the state is obtained by means of active or passive probing.
As an improvement of the above system, the decision unit may be characterized by calculation of a set of decision functions, a set of decision functions corresponds to a set of post-processing actions, values of the decision functions are used for deciding whether to execute corresponding post-processing actions, and each decision function adopts a different function form; a decision function corresponding to one or more post-processing actions;
assuming that there are N post-processing actions, the decision function of the nth post-processing action for the former
Figure BDA0002836546320000031
The expression of (c) is as follows:
Figure BDA0002836546320000032
wherein N is 1,2, …, N
The input X of the function belongs to (PV U NV), PV is a transmission processing information set, NV is a network state set, n is a label of a post-processing action, and a decision function
Figure BDA0002836546320000033
Value d ofnFor deciding whether to perform a post-processing action of reference n;
for the latter, the post-processing actions are divided into M subgroups, 1 ≦ M<N, one decision function corresponds to one subgroup, each subgroup comprising klThe post-processing actions are:
Figure BDA0002836546320000034
wherein k is more than or equal to 1l≤N，
Decision function
Figure BDA0002836546320000035
The expression of (a) is as follows:
Figure BDA0002836546320000036
wherein, l is 1,2, …, M
Wherein the content of the first and second substances,
Figure BDA0002836546320000037
is the l-th decision function
Figure BDA0002836546320000038
Each corresponding to a respective post-processing action in the ith sub-group.
As an improvement of the above system, the post-processing action specifies the forwarding processing behavior of the intermediate transmission node on the received transport layer protocol packet, including but not limited to direct forwarding, caching, storing, neighboring forwarding, and modified forwarding.
As an improvement of the above system, the proximity forwarding action comprises: modifying the destination address in the message into the address of the adjacent node and then forwarding, and simultaneously forwarding the original message or modifying the related indication information in the message and then forwarding; the neighboring nodes are other intermediate transmission nodes selected according to the distance from the current node; including but not limited to network distance or geographic distance.
As an improvement of the above system, the addresses of the neighboring nodes are filled in according to the output values of a neighboring node selection function sn (y), which is expressed as:
SN(Y)＝{NAi，i＝1,…,I}
the function selects suitable adjacent nodes from other adjacent intermediate transmission nodes according to the adjacent node state, the function form is not limited, the input Y is the adjacent node state, and the output value NAiIs the network address of the ith neighbor node meeting the selection function selection condition, I is the network address of the ith neighbor node meeting the selection function selection conditionThe selection function selects the total number of neighboring nodes of the condition.
As an improvement of the above system, a name resolution system is configured outside the data transmission system, and is used for managing and maintaining mapping relationships between IDs and network addresses of each node of the data transmission system and between data block IDs and network addresses of nodes storing the data blocks, wherein one data block ID may correspond to a plurality of network addresses; thereby providing ID to NA resolution services; the node storing the data block is a data source service node or an intermediate transmission node which stores the data block identified by the ID and can provide the content sending service of the data block.
As an improvement of the above system, the modifying forwarding is forwarding after modifying the destination address in the message, and the modified corresponding address is filled by the output value of the selection function g (cna), and the expression of the selection function is:
G(CNA)＝{NAj,NAj∈CNA，j＝1,…,J}，
the CNA is a network address set of a node storing a data block identified as an ID, or a network address set of a data request node corresponding to the data request node ID, where the set may be, but is not limited to, querying and acquiring from a name resolution system, and g (CNA) may define one or more nodes based on application and network requirements; output value NAjIs the network address of the jth node storing the data block identified by the ID, and J is the total number of nodes storing the data block identified by the ID.
The invention has the advantages that:
by the system, the data block is transmitted between the data request node and the intermediate transmission node or the data source service node based on the unchangeable data block ID and the data request node ID, and the decision and the processing of the message field are realized by the intermediate transmission node, so that the caching and the storage of the data block in the transmission process are realized.
Drawings
FIG. 1 is a schematic diagram of a data transmission system with network memory capability according to the present invention;
FIG. 2 is a schematic diagram of a message with a message field containing decision processing indication information;
FIG. 3 is a message diagram of a message payload containing decision processing indication information;
FIG. 4 is a functional block diagram of an intermediate transport node;
FIG. 5 is a schematic diagram A of a data request and response flow;
fig. 6 is a schematic diagram B of a data request and response flow.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1, the data transmission system with network storage capability according to the present invention comprises a data request node, a data source service node, an intermediate transmission node capable of processing a transmission layer packet and having a self-decision data storage function, and the like, wherein each node has a unique Identifier (ID) of the whole network and at least one Network Address (NA); the transmission object of the system is a data block (ID-c in the figure) with a network-wide unique ID, the intermediate transmission node and the data source service node of the system can respond to the request initiated by the data request node, and all the nodes of the system comprise a unit module for processing the ID-based transmission layer protocol message.
The data request node of the system has the functions of generating and sending a data request message and receiving a data response message; the data source service node of the system has the functions of responding to the data request message, and generating and sending a data response message.
The external part of the system is responsible for managing and maintaining the mapping relation between each node ID of the data transmission system and the network address of the node and between the ID of the data block and the network address of the node storing the data block by a name resolution system, and provides resolution service from the ID to the NA; the mapping relationship may be that one data block ID corresponds to a plurality of network addresses, for example, the data block ID-c in the figure corresponds to two network addresses NA-s and NA-t 3.
The header field of the transport layer protocol packet proposed by the present invention may include, but is not limited to, a data block ID, a data request node ID, a source address, a destination address, a packet type and a decision processing indication field, and fig. 2 is a schematic diagram of the packet in an IPv6 network.
The data block ID and the data request node ID are kept unchanged in the transmission process, the message types include but are not limited to a data request message and a data response message, and the decision processing indication field includes but is not limited to a preference indication, a cache indication and a QoS indication, and can be combined. The source address of the data request message is the network address of the data request node corresponding to the data request node ID, the destination address is the address of the node which stores the data block identified as ID and can provide the data block content transmission service, and the destination address can be changed according to the node providing the transmission service and the change of the network address thereof in the transmission process.
The source address of the data response message is the address of the node which stores the data block identified as ID and can provide the data block content transmission service, and the destination address is the address of the data request node corresponding to the data request node ID, wherein the source address can be changed according to the node providing the transmission service and the change of the network address thereof in the transmission process.
In the decision processing indication field, the value of the preference indication field expresses the preferred network location indication information of the cached or stored data block, including but not limited to, the proximity to the data request node, the proximity to the data source, the proximity to the network core, and the combination thereof; the numerical value of the cache indication field expresses cache behavior indication information of the data block content in the message to which the field belongs on the transmission path, including but not limited to the number of times that the data block has been cached on the transmission path, the number of times that the data block needs to be cached, and the like; the value of the QoS indication field expresses QoS requirement indication information of the data block content during transmission, buffering, and storage, including but not limited to requirements of delay, throughput, reliability, and the like.
Decision processing indication information in a message field can also be transmitted through a message load, and fig. 3 shows a message schematic diagram for transmitting the information through the message load, and a TLV (Tag, Length, Value) encoding format is adopted, where tags 1,2, and 3 respectively correspond to information such as QoS indication, preference indication, and cache indication.
A functional block diagram of an intermediate transmission node is shown in fig. 4, and includes a transport layer protocol packet processing module, a decision module, and a post-processing module, where:
the transmission layer protocol message processing module is responsible for receiving and identifying the transmission layer protocol message based on the ID, analyzing the message, acquiring information such as a data block ID, a data request node ID, a source address, a destination address, a message type, a decision processing indication and the like contained in a header field or a load of the transmission layer protocol message, and meanwhile, constructing a transmission processing information set based on the information and transmitting the transmission processing information set to the decision module. And the message processed by the post-processing module is also transmitted to the network layer to be sent out.
The input of the decision module is a transmission processing information set transmitted by the transmission layer protocol message processing module and a network state set of the current node, and the output result is transmitted to the post-processing module for deciding whether to execute a corresponding post-processing action.
The decision module may be characterized by the calculation of a set of decision functions, a set of decision functions corresponding to a set of post-processing actions, the values of the decision functions being used to decide whether to perform the corresponding post-processing actions, each decision function may take a different functional form. One decision function may correspond to one post-processing action or to a plurality of post-processing actions. Without loss of generality, assume that there are N post-processing actions (N ≧ 1), for the former, the decision function of the nth post-processing action
Figure BDA0002836546320000061
The expression of (a) is as follows:
Figure BDA0002836546320000062
wherein N is 1,2, …, N
The input X belongs to (PV ^ NV) of the function, PV is a transmission processing information set, NV is a network state set, n is a label of a post-processing action, and the decision function
Figure BDA0002836546320000063
Value d ofnFor deciding whether to perform a post-processing action referenced n.
For the latter, the post-processing action is divided into M subgroups (1. ltoreq. M)<N), one decision function for each subgroup, each subgroup containing klThe post-processing actions are:
Figure BDA0002836546320000064
wherein k is more than or equal to 1l≤N，
The decision function is expressed as follows:
Figure BDA0002836546320000065
where l is 1,2, …, M,
wherein the content of the first and second substances,
Figure BDA0002836546320000066
is the ith decision function
Figure BDA0002836546320000067
Each value corresponding to a post-processing action of the ith sub-group.
The post-processing module decides whether to execute post-processing actions such as direct forwarding, caching, storing, adjacent forwarding, modified forwarding and the like based on the output of the decision module. Wherein, the first and the second end of the pipe are connected with each other,
and directly forwarding the message without modifying the message.
The caching is to store the data block content in the message in the middle transmission node, and simultaneously forward the original message, or forward after modifying the related indication information in the message.
The storage is that the data block content in the message is stored locally at the intermediate transmission node.
The adjacent forwarding is to modify the destination address in the message into the address of the adjacent node and then forward, and simultaneously, the original message can be forwarded, or the related indication information in the message can be modified and then forwarded. The neighbor nodes of the current node are other intermediate transmission nodes selected according to the distance from the current node, which may be measured, but not limited to, by network distance or geographic distance. The destination address of the neighbor forwarding modification may be filled in according to the output value of the neighbor node selection function sn (y),
SN(Y)＝{NAi，i＝1,…,I}
the function selects other suitable transmission nodes from the transmission nodes adjacent to the current intermediate transmission node according to the adjacent node state, the function form is not limited, the input Y is the adjacent node state, and the output value NA isiIs the network address of the neighboring intermediate transfer node that meets the selection function selection criteria.
The modifying and forwarding is to modify and forward the destination address in the message, the modified corresponding address is filled by the output value of the selecting function G (CNA), and the expression of the selecting function is as follows:
G(CNA)＝{NAj,NAj∈CNA，j＝1,…,J}
the CNA is a network address set of nodes storing data blocks identified as the ID corresponding to the data block ID, or a network address set of data requesting nodes corresponding to the data requesting node ID, where the set may be, but is not limited to, query and obtain from a name resolution system, and g (CNA) may define one or more based on application and network requirements.
Decision function
Figure BDA0002836546320000071
A two-step decision making mode can be adopted, some relatively independent decision making items such as data block caching/storage requirements, current node caching/storage capacity, adjacent node selection and caching capacity and the like are firstly judged once, and then joint decision making is carried out based on the judgment result, namely the decision making function can be expressed as a joint decision making function for a series of decision making item judgment function output values:
Figure BDA0002836546320000072
wherein the content of the first and second substances,
Figure BDA0002836546320000073
is a joint decision function for the nth post-processing action, whose input is the trigger of the nth post-processing actionDecision function for making relevant decision items
Figure BDA0002836546320000074
The output value of (a) is set,
Figure BDA0002836546320000075
and
Figure BDA0002836546320000076
the form of (A) is not limited.
The decision function of the relevant decision item can be expressed as:
Figure BDA0002836546320000081
a buffer decision function is shown for deciding whether the data block content in the message needs to be buffered at the current intermediate transmission node, and the output value thereof may be characterized by, but not limited to, a boolean value:
Figure BDA0002836546320000082
Figure BDA0002836546320000083
a representation buffering capacity decision function for deciding whether the current intermediate transmission node has the capacity to buffer the data block, and its output value may be characterized by, but not limited to, a boolean value:
Figure BDA0002836546320000084
Figure BDA0002836546320000085
and a function representing a proximity cache decision function, which is used for deciding whether the current intermediate transmission node can forward the packet to the adjacent intermediate transmission node for caching, and the output value of the function can be characterized by, but is not limited to, a boolean value:
Figure BDA0002836546320000086
Figure BDA0002836546320000087
a storage decision function is shown for deciding whether the data block content in the message needs to be stored at the current intermediate transmission node, and its output value may be characterized by, but not limited to, a boolean value:
Figure BDA0002836546320000088
Figure BDA0002836546320000089
a storage capacity decision function is represented for deciding whether the current intermediate transfer node has the capacity to store a data block, and its output value may be characterized by, but not limited to, a boolean value:
Figure BDA00028365463200000810
Figure BDA00028365463200000811
a destination address decision function is represented for deciding whether to modify the destination address, the output value of which may be characterized by, but is not limited to, a boolean value: :
Figure BDA00028365463200000812
Figure BDA00028365463200000813
a source address decision function is represented for deciding whether to modify the source address, the output values of which may be characterized by, but not limited to, boolean values: :
Figure BDA00028365463200000814
Figure BDA00028365463200000815
are other decision functions involved depending on the application or network requirements.
Thus, the joint decision function for post-processing actions such as direct forwarding, caching, storing, neighbor forwarding, and modified forwarding may be:
(1) for direct forwarding actions
Figure BDA0002836546320000091
(2) For caching actions
Figure BDA0002836546320000092
(3) For storage actions
Figure BDA0002836546320000093
(4) For neighbor forwarding actions
Figure BDA0002836546320000094
(5) For modifying forwarding actions
Figure BDA0002836546320000095
When the output value of the joint decision function is 'true', the corresponding post-processing action is executed, the output of the joint decision function can also be a continuous value, and whether the corresponding post-processing action is executed or not is determined through comparison with a threshold value.
Fig. 5 and fig. 6 show a specific implementation of a data request and response procedure of the transmission system according to the present invention.
For fig. 5, without loss of generality, it is assumed that each intermediate transfer node does not cache or store any data blocks at initialization; the data source service node is provided with a network address NA-s, stores a data block identified by ID-c, and registers the mapping relation between the ID-c and the data source service node address NA-s in a name resolution system; the data request node 1 is provided with a unique identification ID-r1 of the whole network and a network address NA-r 1; the intermediate transmission nodes 1,2 and 3 are respectively provided with network addresses NA-t1, NA-t2 and NA-t3, the decision function in the decision module adopts a two-step decision mode, wherein the cache decision function
Figure BDA0002836546320000096
Assume that all are
Figure BDA0002836546320000097
Namely, the current node always needs to be cached; in the header field of the transport layer protocol message, the values of the message type field are set to be 0 and 1, wherein 0 represents a data request message, and 1 represents a data response message.
(101) The data request node 1 sends an analysis request to a name analysis system, the request carries a data block ID-c, and the name analysis system returns a data source service node address NA-s storing the data block ID-c;
(102) a transmission layer protocol message processing module of a data request node 1 generates and sends a data request message, and initiates a request for a data block, wherein the message type is 0, the data block ID is ID-c, the data request node ID is ID-r1, the destination address is NA-s, the source address is NA-r1, and the message is forwarded to an intermediate transmission node 1 according to the routing mechanism of the network itself where the message is located;
(103) a transmission layer protocol message processing module of the intermediate transmission node 1 receives a data request message, identifies and analyzes the message, reads the message type of 0 as the data request message, reads a destination address which is not the address of the node, directly forwards the message, and forwards the message to the intermediate transmission node 2 according to the routing mechanism of the network in which the message is located;
(104) a transmission layer protocol message processing module of the intermediate transmission node 2 receives a data request message, identifies and analyzes the message, reads the message type of 0 as the data request message, reads a destination address which is not the address of the node, directly forwards the message, and forwards the message to a data source service node according to the routing mechanism of the network in which the message is located;
(105) a transmission layer protocol message processing module of a data source service node receives a data request message, identifies and analyzes the message, reads that the message type is 0, the message is a data request message, then reads a destination address, the destination address NA-s is the network address of the node, so that a data response message is generated in response to the data request, the message type is 1, the data block ID is ID-c, the data request node ID is ID-r1, the destination address is NA-r1, the source address is NA-s, the decision processing indication field information at least contains cache indication, then the data block content corresponding to the ID-c is encapsulated, the message is sent, and the message is forwarded to an intermediate transmission node 3 according to the routing mechanism of the network itself.
(106) A transmission layer protocol message processing module of the intermediate transmission node 3 receives the data response message, identifies and analyzes the message, reads the message type 1, is the data response message, reads decision processing indication information and transmits the decision processing indication information to a decision module; decision module calculation
Figure BDA0002836546320000101
And
Figure BDA0002836546320000102
Figure BDA0002836546320000103
a cache is required and, because the current node does not cache and store any data blocks, is capable of caching,
Figure BDA0002836546320000104
based on this, a joint decision function for the cache action is calculated
Figure BDA0002836546320000105
Namely, the decision result is to execute the caching process, so the post-processing module executes the caching action to cache the content of the data block, and after the cache action is successful, the step (107) is executed, and simultaneously the original message is forwarded, or the cache indication information in the message can be modified and then forwarded, and the message is forwarded to the intermediate transmission node 1 according to the routing mechanism of the network where the message is located.
(107) The intermediate transfer node 3 registers the mapping relationship between the data block ID and the network address NA-t3 of the intermediate transfer node 3 with the name resolution system.
(108) A transmission layer protocol message processing module of the intermediate transmission node 1 receives the data response message, identifies and analyzes the message, reads the message type 1, reads decision processing indication information as the data response message, and transmits the decision processing indication information to a decision module; decision module calculation
Figure BDA0002836546320000106
And
Figure BDA0002836546320000107
Figure BDA0002836546320000108
a cache is required and, because the current node does not cache and store any data blocks, is capable of caching,
Figure BDA0002836546320000109
based on this, a joint decision function for the cache action is calculated
Figure BDA0002836546320000111
Namely, the decision result is to execute caching, so that the post-processing module executes caching action to cache the content of the data block, and executes step (109) after success, and simultaneously forwards the original message, or modifies the cache indication information in the message and forwards the message, and the message is forwarded to the data request node 1 according to the routing mechanism of the network in which the message is located.
(109) The intermediate transfer node 1 registers the mapping of the data block ID with the network address NA-t1 of the intermediate transfer node 1 with the name resolution system.
(110) The transmission layer protocol message processing module of the data request node 1 receives the data response message, identifies and analyzes the message, reads the message type as 1, reads the destination address as the data response message, and the destination address NA-r1 is the network address of the node, so as to read the content of the data block, and provides the read content of the data block to the upper layer application.
In the execution process of the step (105), the step (105a) may be executed to update the destination address, and then the message may be sent.
(105a) The data source service node sends an analysis request to a name analysis system, the request carries a data request node 1 identifier ID-r1, the name analysis system returns an address NA-r1 corresponding to the ID-r1, and a destination address is updated;
in the execution process of the step (106), the step (106a) may be executed to update the destination address, and then the packet may be forwarded.
(106a) The intermediate transmission node 3 sends an analysis request to the name analysis system, the request carries the ID-r1 of the node 1 of the data request, the name analysis system returns the address NA-r1 corresponding to the ID-r1, and the destination address is updated;
in the execution process of the intermediate transmission node 1 in step (108), the destination address may be updated first, and then the packet is forwarded, which is similar to step (106a) and is not described again.
Step (105) of the above flow begins, and the data response packet is sequentially transmitted to the intermediate transmission nodes 3 and 1 and the data request node 1 according to the routing mechanism of the network itself, and may also be transmitted along the paths of the intermediate transmission nodes 2 and 1 and the data request node 1 according to the routing mechanism of the network itself.
In step (105) of the above process, when the data source service node transport layer protocol packet processing module encapsulates the data response packet, the size of the data block may be larger than the maximum length of the network layer packet, the data block corresponding to the ID-c may be segmented into smaller data pieces, and encapsulated into a plurality of data packets for transmission, and the transmission time may be, but is not limited to, continuous transmission or transmission according to the request condition of the data request node.
In FIG. 6, a data requesting node 2 is added to the data requesting node in FIG. 5, and has a network address NA-r2 and a network unique identifier ID-r 2. Furthermore, it is assumed that the data requesting node 1 has requested and obtained a data block identified by ID-c according to the flow of fig. 5, which has also been successfully cached and registered in the intermediate transfer node 3, 1; the specific implementation flow of the data request node 2 requesting the data block identified by the ID-c is as follows:
(201) the data request node 2 sends an analysis request to a name analysis system, the request carries a data block ID-c, the name analysis system returns a network address set CNA storing the data block ID-c, the network address set CNA comprises data source service node addresses NA-s, addresses NA-r3 and NA-r1 of intermediate transmission nodes 3 and 1, and assuming that NA-r3 is selected; the name resolution system may also select an address to return, and the selection method is not limited, and it is assumed that the address returns to NA-r 3;
(202) a transmission layer protocol message processing module of the data request node 2 generates and sends a data request message and initiates a request for a data block, wherein the message type is 0, the data block ID is ID-c, the data request node ID is ID-r2, the source address is NA-r1, and the destination address is NA-r 3; the message is forwarded to the intermediate transmission node 1 according to the routing mechanism of the network in which the message is located;
(203) a transmission layer protocol message processing module of the intermediate transmission node 1 receives a data request message, identifies and analyzes the message, reads the message type of 0, the message is a data request message, reads a destination address, the destination address is not the address of the node, directly forwards the message, and forwards the message to the intermediate transmission node 3 according to the routing mechanism of the network in which the message is located;
(204) a transmission layer protocol message processing module of the intermediate transmission node 3 receives the data request message, identifies and analyzes the message, reads that the message type is 0, and the message is a data request message, and then reads a destination address, and the destination address is the address of the node, so that a data response message is generated in response to the data request, the message type is 1, the data block ID is ID-c, the data request node ID is ID-r2, the destination address is NA-r2, the source address is NA-t3, the decision processing indication field information at least contains cache indication, and then the data block content corresponding to the ID-c is encapsulated, and the message is sent, and the message is forwarded to the intermediate transmission node 1 according to the routing mechanism of the network itself.
(205) A transmission layer protocol message processing module of the intermediate transmission node 1 receives the data response message, identifies and analyzes the message, reads the message type 1, reads decision processing indication information as the data response message, and transmits the decision processing indication information to a decision module; decision module calculation
Figure BDA0002836546320000121
And
Figure BDA0002836546320000122
Figure BDA0002836546320000123
caching is required, assuming that the current node is currently capable of caching,
Figure BDA0002836546320000124
based on this, a joint decision function for the cache action is calculated
Figure BDA0002836546320000125
That is, the decision result is to execute caching, so the post-processing module executes caching to cache the content of the data block, and since the node caches the data block, the node does not need to cache again, and simultaneously forwards the original message, and also can modify the cache indication information in the message and then forward the message, and the message is forwarded to the data request node 2 according to the routing mechanism of the network where the message is located.
(206) The transport layer protocol message processing module of the data request node 2 receives the data response message, identifies and analyzes the message, reads the message type 1, and reads the destination address as the data response message, wherein the destination address NA-r2 is the network address of the node, so that the content of the data block is read, and the read content of the data block is provided to the upper layer application.
In the execution process of the above steps (204) and (205), the destination address may be updated first, and then the packet is forwarded, the steps are similar to (106a), and are not described again.
Finally, it should be noted that the above embodiments are only used for illustrating 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 (13)

1. A data transmission system with network internal storage capability is characterized in that the data transmission system comprises a data request node, a data source service node and an intermediate transmission node, each node has a network-wide unique Identifier (ID), at least has a Network Address (NA) and is provided with a unit for processing a transmission layer protocol message based on the ID, and a transmission object of the data transmission system is a data block with the network-wide unique ID;
the data request node is used for generating and sending a data request message and receiving a data response message;
the data source service node is used for responding to the data request, providing a sending service of the content of the data block when the data block with the ID identification is stored in the node, and generating and sending a data response message;
the intermediate transmission node is used for processing an ID-based transport layer protocol message, has a self-decision data storage function, can decide subsequent processing behaviors from information acquired from the message and a network state of the node, can respond to a data request, provides a sending service of the content of a data block when the data block identified by the ID is stored in the node, and generates and sends a data response message.
2. The data transmission system with in-network storage capability of claim 1, wherein the header fields of the ID-based transport layer protocol packet include but are not limited to a data block ID, a data request node ID, a source address, a destination address, a packet type and a decision processing indication field; the data block ID and the data request node ID are kept unchanged in the transmission process, the message types include but are not limited to a data request message and a data response message, and the decision processing indication field includes but is not limited to a preference indication field, a cache indication field, a QoS indication field and a combination thereof; the corresponding indication information contained in the decision processing indication field is not limited to be transmitted through a message field, and can also be transmitted through a message load.
3. The data transmission system with network internal storage capability of claim 2, wherein the source address in the data request message is the network address of the data request node corresponding to the data request node ID, the destination address is the address of the node storing the data block identified by the data block ID and capable of providing the data block content transmission service, and the destination address changes during transmission according to the node providing the transmission service and the change of the network address thereof.
4. The data transmission system with in-network storage capability according to claim 2, wherein the source address of the data response message is an address of a node which stores the data block identified by the data block ID and can provide a service for sending the content of the data block; the destination address is an address of the data requesting node corresponding to the data requesting node ID, wherein the source address varies in transmission according to a change of the node providing the transmission service and its network address.
5. The data transmission system with in-network storage capability of claim 2, wherein the value of the preference indication field expresses the best network location indication information for caching or storing the data block, including but not limited to near data requesting nodes, near data sources, near network core and combinations;
the numerical value of the cache indication field expresses cache behavior indication information of the data block content in the message to which the field belongs on a transmission path, and the cache behavior indication information includes but is not limited to the number of times that the data block is cached and the number of times that the data block needs to be cached on the transmission path;
the value of the QoS indication field expresses QoS requirement indication information of the data block contents during transmission, buffering and storage, including but not limited to delay, throughput and reliability.
6. The system of claim 1, wherein the intermediate transfer node comprises a decision unit having inputs of a set of transfer process information and a set of network states of the node, and an output for deciding whether to perform a corresponding post-processing action.
7. The data transmission system with in-network storage capability according to claim 6, wherein the transmission processing information set is composed of information obtained by the intermediate transmission node by parsing the packet, including but not limited to packet header field information and indication information passed in the packet payload; the network state set comprises the self state and the adjacent node state of the intermediate transmission node; the self state is used for indicating the self resource providing capability of the current intermediate transmission node, including but not limited to available cache space, available storage space and available bandwidth; the neighboring node status is used for indicating the relevant status information of other neighboring intermediate transmission nodes of the current intermediate transmission node, including but not limited to the network address, the available storage space and the network distance to the node of the neighboring intermediate transmission node; the number of other adjacent intermediate transmission nodes is not limited to 1, and the state of the other adjacent intermediate transmission nodes is obtained by means of active or passive detection.
8. The data transmission system with network memory capability according to claim 6 or 7, wherein the decision unit is characterized by calculation of a set of decision functions, a set of decision functions corresponds to a set of post-processing actions, values of the decision functions are used for deciding whether to execute the corresponding post-processing actions, and each decision function takes a different function form; a decision function corresponding to one or more post-processing actions;
assuming that there are N post-processing actions, the decision function of the nth post-processing action for the former
Figure FDA0002836546310000025
The expression of (a) is as follows:
Figure FDA0002836546310000021
wherein N is 1,2, …, N
The input X of the function belongs to (PV U NV), PV is a transmission processing information set, NV is a network state set, n is a label of a post-processing action, and a decision function
Figure FDA0002836546310000022
Value d ofnFor deciding whether to perform a post-processing action of reference n;
for the latter, the post-processing actions are divided into M subgroups, 1 ≦ M<N, one decision function corresponds to one subgroup, each subgroup comprising klThe post-processing actions are:
Figure FDA0002836546310000023
wherein k is more than or equal to 1l≤N，
Decision function
Figure FDA0002836546310000024
The expression of (c) is as follows:
Figure FDA0002836546310000031
wherein, l is 1,2, …, M
Wherein the content of the first and second substances,
Figure FDA0002836546310000032
is the ith decision function
Figure FDA0002836546310000033
Each corresponding to a respective post-processing action in the ith sub-group.
9. The system of claim 6, wherein the post-processing action specifies forwarding processing behavior of the intermediate transport node on the received transport layer protocol packet, including but not limited to direct forwarding, caching, storing, neighbor forwarding, and modified forwarding.
10. The data transfer system with in-network storage capability of claim 9, wherein the proximity forwarding action comprises: modifying the destination address in the message into the address of the adjacent node and then forwarding, and simultaneously forwarding the original message or modifying the related indication information in the message and then forwarding; the neighboring nodes are other intermediate transmission nodes selected according to the distance from the current node; including but not limited to network distance or geographic distance.
11. The data transmission system with in-network storage capability according to claim 10, wherein the addresses of the neighboring nodes are filled in according to the output values of a neighboring node selection function sn (y) whose expression is:
SN(Y)＝{NAi，i＝1，...I}
the function selects a suitable adjacent node from other intermediate transmission nodes adjacent to the current intermediate transmission node according to the adjacent node state, the function form is not limited, the input Y is the adjacent node state, and the output value NA isiIs the network address of the ith neighbor node that meets the selection function selection criteria, and I is the total number of neighbor nodes that meet the selection function selection criteria.
12. The data transmission system with network internal storage capability of claim 9, wherein a name resolution system is configured outside the data transmission system for managing and maintaining the mapping relationship between the ID and the network address of each node of the data transmission system, and between the ID of a data block and the network address of the node storing the data block, and one data block ID may correspond to a plurality of network addresses; thereby providing ID to NA resolution services; the node storing the data block is a data source service node or an intermediate transmission node which stores the data block identified by the ID and can provide the content sending service of the data block.
13. The data transmission system with in-network storage capability of claim 12, wherein the modified forwarding is forwarding after modifying the destination address in the message, and the modified corresponding address is filled in by the output value of a selection function g (cna), and the expression of the selection function is:
G(CNA)＝{NAj，NAj∈CNA，j＝1，...，J}，
the CNA is a network address set of a node storing a data block identified as an ID, or a network address set of a data request node corresponding to the data request node ID, where the set may be, but is not limited to, querying and acquiring from a name resolution system, and g (CNA) may define one or more nodes based on application and network requirements; output value NAjIs the network address of the jth node storing the data block identified by the ID, and J is the total number of nodes storing the data block identified by the ID.
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