Source: http://www.google.com/patents/US7756134?dq=6,418,462
Timestamp: 2014-07-24 03:37:06
Document Index: 44596242

Matched Legal Cases: ['art 2', 'art 1', 'art 1', 'art 2', 'art 2', 'art 1', 'art 1', 'art 2', 'art 2']

Patent US7756134 - Systems and methods for close queuing to support quality of service - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign in<nobr>Advanced Patent Search</nobr>PatentsCertain embodiments of the present invention provide systems and methods for enqueuing transport protocol commands with data in a low-bandwidth network environment. The method may include receiving data for transmission via a network connection, enqueuing the data, enqueuing a transport protocol command...http://www.google.com/patents/US7756134?utm_source=gb-gplus-sharePatent US7756134 - Systems and methods for close queuing to support quality of serviceAdvanced Patent SearchPublication numberUS7756134 B2Publication typeGrantApplication numberUS 11/415,914Publication dateJul 13, 2010Filing dateMay 2, 2006Priority dateMay 2, 2006Fee statusPaidAlso published asCA2650909A1, CA2650909C, CN101502055A, CN101502055B, EP2022202A2, EP2022202A4, US20070258486, WO2007130413A2, WO2007130413A3Publication number11415914, 415914, US 7756134 B2, US 7756134B2, US-B2-7756134, US7756134 B2, US7756134B2InventorsDonald L. Smith, Anthony P. Galluscio, Robert J. KnazikOriginal AssigneeHarris CorporationExport CitationBiBTeX, EndNote, RefManPatent Citations (103), Non-Patent Citations (131), Referenced by (1), Classifications (21), Legal Events (1) External Links: USPTO, USPTO Assignment, EspacenetSystems and methods for close queuing to support quality of serviceUS 7756134 B2Abstract Certain embodiments of the present invention provide systems and methods for enqueuing transport protocol commands with data in a low-bandwidth network environment. The method may include receiving data for transmission via a network connection, enqueuing the data, enqueuing a transport protocol command related to the network connection, transmitting the data via the network connection, and transmitting the transport protocol command after transmission of the data. In certain embodiments, the data and the transport protocol command are enqueued based at least in part on manipulating a transport protocol layer of a communication network, such as a tactical data network. In certain embodiments, the data is prioritized based on at least one rule, such as a content-based rule and/or a protocol-based rule. In certain embodiments, the transport protocol command includes a close connection command, for example.
1. A method for data communication, said method comprising:
performing by at least one processing device, at least:
opening a connection between a first node and a second node in a network to communicate data between said first node and said second node;
receiving said data and a transport protocol command;
enqueuing said received data and said received transport protocol command in at least one queue; and
holding, between a socket layer and a transport protocol layer, said enqueued transport protocol command from being processed ahead of said enqueued data irrespective of arrival sequence of said transport protocol command in relation to said data being communicated between said first node and said second node via said connection, such that said enqueued transport protocol command is processed after transmission of said enqueued data from said at least one queue is completed.
2. The method of claim 1, wherein said step of holding comprises enqueuing said transport protocol command behind said data in said at least one queue such that said transport protocol command is executed with respect to said connection after said data has been communicated between said first node and said second node.
3. The method of claim 1, wherein said step of holding comprises manipulating a transport protocol layer of said network to hold said transport protocol command in relation to said data.
4. The method of claim 1, comprising holding said data between said socket layer and said transport protocol layer to prioritize communication of said data from said first node to said second node via said connection.
5. The method of claim 1, wherein said connection comprises a transmission control protocol (�TCP�) connection.
6. The method of claim 1, wherein said network comprises a tactical data network having a bandwidth constrained by an environment in which said network operates.
7. The method of claim 1, wherein said transport protocol command comprises a close connection command.
8. A non-transitory computer-readable medium having a set of instructions for execution on a processing device, said set of instructions comprising:
a connection routine for establishing a transport connection between a first node and a second node to communicate data between said first node and said second node;
a receive routine for receiving said data and a transport protocol command;
a queue routine for enqueuing said received data and said received transport protocol command in at least one queue; and
a hold routine operating between a socket layer and a network transport layer for holding said enqueued transport protocol command from being processed ahead of said enqueued data irrespective of arrival sequence of said transport protocol command in relation to said data being communicated between said first node and said second node via said transport connection, wherein said enqueued transport protocol command is processed after transmission of said enqueued data from said at least one queue is completed.
9. The set of instructions of claim 8, wherein said hold routine enqueues said transport protocol command behind said data in said at least one queue such that said transport protocol command is executed with respect to said transport connection after said data has been communicated between said first node and said second node.
10. The set of instructions of claim 8, wherein said queue routine enqueues said data and said transport protocol command in relation to said transport connection.
11. The set of instructions of claim 8, wherein said transport connection comprises a transmission control protocol (�TCP�) socket connection.
12. The set of instructions of claim 8, wherein said transport protocol command comprises a close connection command.
13. The set of instructions of claim 8, comprising a prioritization routine for prioritizing communication of said data between said first node and said second node based on at least one rule.
14. The set of instructions of claim 8, wherein said transport connection is established between said first node and said second node in a tactical data network having a bandwidth constrained by an environment in which said network operates.
15. A method for enqueuing transport protocol commands with data in a low-bandwidth network environment, said method comprising:
receiving data for transmission via a network connection;
enqueuing said received data prior to transmission via said network connection;
enqueuing a transport protocol command related to said network connection, wherein said enqueuing occurs between a socket layer and a transport protocol layer, and said transport protocol command is enqueued to be processed after said enqueued data irrespective of arrival sequence of said transport protocol command in relation to said enqueued data;
transmitting said enqueued data via said network connection; and
transmitting said transport protocol command after transmission of said enqueued data is completed.
16. The method of claim 15, wherein said data and said transport protocol command are enqueued based at least in part on manipulating a transport protocol layer of a communication network.
17. The method of claim 15, comprising prioritizing said data based on at least one rule.
18. The method of claim 17, wherein said at least one rule relates to at least one of content and protocol.
19. The method of claim 15, comprising executing said transport protocol command with respect to said transport connection after said data has been transmitted between said first node and said second node.
20. The method of claim 15, wherein said transport protocol command comprises a close connection command.
BACKGROUND OF THE INVENTION The presently described technology generally relates to communications networks. More particularly, the presently described technology relates to systems and methods for protocol filtering for Quality of Service.
Protocols in a protocol stack typically exist in a hierarchy. Often, protocols are classified into layers. One reference model for protocol layers is the Open Systems Interconnection (�OSI�) model. The OSI reference model includes seven layers: a physical layer, data link layer, network layer, transport layer, session layer, presentation layer, and application layer. The physical layer is the �lowest� layer, while the application layer is the �highest� layer. Two well-known transport layer protocols are the Transmission Control Protocol (�TCP�) and User Datagram Protocol (�UDP�). A well known network layer protocol is the Internet Protocol (�IP�).
An example of how a tactical data network may be employed is as follows. A logistics convoy may be in-route to provide supplies for a combat unit in the field. Both the convoy and the combat unit may be providing position telemetry to a command post over satellite radio links. An unmanned aerial vehicle (�UAV�) may be patrolling along the road the convoy is taking and transmitting real-time video data to the command post over a satellite radio link also. At the command post, an analyst may be examining the video data while a controller is tasking the UAV to provide video for a specific section of road. The analyst may then spot an improvised explosive device (�IED�) that the convoy is approaching and send out an order over a direct radio link to the convoy for it to halt and alerting the convoy to the presence of the IED.
The various networks that may exist within a tactical data network may have many different architectures and characteristics. For example, a network in a command unit may include a gigabit Ethernet local area network (�LAN�) along with radio links to satellites and field units that operate with much lower throughput and higher latency. Field units may communicate both via satellite and via direct path radio frequency (�RF�). Data may be sent point-to-point, multicast, or broadcast, depending on the nature of the data and/or the specific physical characteristics of the network. A network may include radios, for example, set up to relay data. In addition, a network may include a high frequency (�HF�) network which allows long rang communication. A microwave network may also be used, for example. Due to the diversity of the types of links and nodes, among other reasons, tactical networks often have overly complex network addressing schemes and routing tables. In addition, some networks, such as radio-based networks, may operate using bursts. That is, rather than continuously transmitting data, they send periodic bursts of data. This is useful because the radios are broadcasting on a particular channel that must be shared by all participants, and only one radio may transmit at a time.
Another approach is Quality of Service (�QoS�). QoS refers to one or more capabilities of a network to provide various forms of guarantees with regard to data that is carried. For example, a network supporting QoS may guarantee a certain amount of bandwidth to a data stream. As another example, a network may guarantee that packets between two particular nodes have some maximum latency. Such a guarantee may be useful in the case of a voice communication where the two nodes are two people having a conversation over the network. Delays in data delivery in such a case may result in irritating gaps in communication and/or dead silence, for example.
QoS may be viewed as the capability of a network to provide better service to selected network traffic. The primary goal of QoS is to provide priority including dedicated bandwidth, controlled jitter and latency (required by some real time and interactive traffic), and improved loss characteristics. Another important goal is making sure that providing priority for one flow does not make other flows fail. That is, guarantees made for subsequent flows must not break the guarantees made to existing flows.
As mentioned, existing QoS solutions require at least the nodes involved in a particular communication to support QoS. However, the nodes at the �edge� of network may be adapted to provide some improvement in QoS, even if they are incapable of making total guarantees. Nodes are considered to be at the edge of the network if they are the participating nodes in a communication (i.e., the transmitting and/or receiving nodes) and/or if they are located at chokepoints in the network. A chokepoint is a section of the network where all traffic must pass to another portion. For example, a router or gateway from a LAN to a satellite link would be a chock point, since all traffic from the LAN to any nodes not on the LAN must pass through the gateway to the satellite link.
If QoS is provided for a TCP socket connection, for example, �open� and �close� commands are required for each connection. Data may be queued for a connection in order to provide QoS for that connection. When a TCP socket �close� is initiated by a communication application, any data that has been queued will be lost if the �close� is immediately honored. In current applications, the close is processed right away, and data may be lost if it is not processed prior to close of the connection. Thus, there is a need for systems and methods to minimize data loss with a TCP socket connection.
BRIEF SUMMARY OF THE INVENTION Embodiments of the present invention provide systems and methods for facilitating communication of data. A method includes opening a connection between a first node and a second node in a network to communicate data between the first node and the second node and holding a transport protocol command in relation to the data being communicated between the first node and the second node via the connection such that the transport protocol command is processed after communication of the data is complete.
Holding may include enqueuing the transport protocol command behind the data such that the transport protocol command is executed with respect to the connection after the data has been communicated between the first and second nodes, for example. The transport protocol command may be held by manipulating a transport protocol layer of the network, for example. Additionally, data may be enqueued at a transport protocol layer to prioritize communication of the data from the first node to the second node via the connection. The connection may include a transmission control protocol socket connection, for example. The transport protocol may include a transmission control protocol, for example. The network may be a tactical data network, for example, having a bandwidth constrained by an environment in which the network operates. The transport protocol command may include a close connection command, for example.
Certain embodiments provide a computer-readable medium having a set of instructions for execution on a processing device. The set of instructions includes a connection routine for establishing a transport connection between a first node and a second node to communicate data between the first node and the second node and a hold routine operating at a network transport layer for holding a transport protocol command in relation to the data being communicated between the first node and the second node via the transport connection, wherein the transport protocol command is processed after communication of the data.
The hold routine may enqueue the transport protocol command in relation to the data being communicated between the first node and the second node via the transport connection, for example. The set of instructions may further include a queue routine, for example, for enqueuing the data and the transport protocol command in relation to the transport connection. The set of instructions may also include a prioritization routine, for example, for prioritizing communication of the data between the first node and the second node based on at least one rule. The transport connection may be established between the first node and the second node in a tactical data network, for example.
Certain embodiments provide a method for enqueuing transport protocol commands with data in a low-bandwidth network environment. The method may include receiving data for transmission via a network connection, enqueuing the data, enqueuing a transport protocol command related to the network connection, transmitting the data via the network connection, and transmitting the transport protocol command after transmission of the data. The data and the transport protocol command may be enqueued based at least in part on manipulating a transport protocol layer of a communication network, for example. The data may be prioritized based on at least one rule, such as a content-based rule and/or a protocol-based rule. The transport protocol command includes a close connection command, for example.
BRIEF DESCRIPTION OF SEVERAL VIEWS OF THE DRAWINGS FIG. 1 illustrates a tactical communications network environment operating with an embodiment of the presently described technology.
FIG. 2 shows the positioning of the data communications system in the seven layer OSI network model in accordance with an embodiment of the presently described technology.
FIG. 3 depicts an example of multiple networks facilitated using the data communications system in accordance with an embodiment of the presently described technology.
FIG. 5 illustrates an example of a queue system for QoS operating above the transport layer in accordance with an embodiment of the presently described technology.
DETAILED DESCRIPTION OF THE INVENTION FIG. 1 illustrates a tactical communications network environment 100 operating with an embodiment of the presently described technology. The network environment 100 includes a plurality of communication nodes 110, one or more networks 120, one or more links 130 connecting the nodes and network(s), and one or more communication systems 150 facilitating communication over the components of the network environment 100. The following discussion assumes a network environment 100 including more than one network 120 and more than one link 130, but it should be understood that other environments are possible and anticipated.
Communication nodes 110 may be and/or include radios, transmitters, satellites, receivers, workstations, servers, and/or other computing or processing devices, for example. Network(s) 120 may be hardware and/or software for transmitting data between nodes 110, for example. Network(s) 120 may include one or more nodes 110, for example. Link(s) 130 may be wired and/or wireless connections to allow transmissions between nodes 110 and/or network(s) 120.
The system 150 may use rules and modes or profiles to perform throughput management functions such as optimizing available bandwidth, setting information priority, and managing data links in the network. By �optimizing� bandwidth, it is meant, for example, that the presently described technology may be employed to increase an efficiency of bandwidth use to communicate data in one or more networks. Optimizing bandwidth usage may include removing functionally redundant messages, message stream management or sequencing, and message compression, for example. Setting information priority may include differentiating message types at a finer granularity than Internet Protocol (IP) based techniques and sequencing messages onto a data stream via a selected rule-based sequencing algorithm, for example. Data link management may include rule-based analysis of network measurements to affect changes in rules, modes, and/or data transports, for example. A mode or profile may include a set of rules related to the operational needs for a particular network state of health or condition. The system 150 provides dynamic, �on-the-fly� reconfiguration of modes, including defining and switching to new modes on the fly.
In certain embodiments, QoS may be provided to a communication network above the transport layer of the OSI protocol model. Specifically, QoS technology may be implemented just below the socket layer of a transport protocol connection. The transport protocol may include a Transmission Control Protocol (TCP), User Datagram Protocol (UDP), or Stream Control Transmission Protocol (SCTP), for example. As another example, the protocol type may include Internet Protocol (IP), Internetwork Packet Exchange (IPX), Ethernet, Asynchronous Transfer Mode (ATM), File Transfer Protocol (FTP), and/or Real-time Transport Protocol (RTP). For purposes of illustration, one or more examples will be provided using TCP.
Since TCP is connection-oriented, sockets are opened and closed via �open� and �close� commands to begin and end a data communication connection between nodes or other network elements. When a TCP socket is closed by an application that is utilizing QoS, prioritized data queued for transmission should be sent before the close command is executed by the network system. Otherwise, data that has been queued may be lost if the �close� is immediately honored by the system. To do this, the �close� is queued until relevant data is sent, and then the close is processed after the data has been transmitted via the connection. Thus, unlike a traditional TCP connection, a close command may be queued with data to allow coordinated processing and transmission of data related to the open connection before the connection is terminated in response to the close command.
Existing QoS solutions in other network environments are implemented below the network layer so as to preclude �close� command queuing or holding. Certain embodiments provide a mechanism to queue or otherwise hold the �close� commands so QoS technology may be implemented above the transport layer, which allows for data inspection and discrimination, for example. For example, implementing QoS solutions above the transport layer in TCP helps provide an ability to discriminate or differentiate data for QoS processing unavailable below the network layer. In certain embodiments, a transport protocol is modified or otherwise manipulated so as to enable queuing or otherwise holding of system commands, such as close connection commands, in addition to data.
For example, certain embodiments queue up or otherwise hold/store the transport protocol mechanism in along with the data to maintain an order between the protocol mechanism and associated data. For example, a TCP close command is identified and queued with associated data for a TCP socket connection so that the associated data is processed and transmitted via the connection before the close command is processed to terminate the connection. By operating above the transport layer, certain embodiments are able to identify protocol mechanisms, such as a close command, and manipulate the mechanisms. In contrast, protocol mechanisms and data below the transport layer are segmented and compacted, and it is difficult to apply rules to manipulate a protocol mechanism, such as a close command, in relation to data.
FIG. 4 illustrates a data communication environment 400 operating with an embodiment of the present invention. The environment 400 includes a data communication system 410, one or more source nodes 420, and one or more destination nodes 430. The data communication system 410 is in communication with the source node(s) 420 and the destination node(s) 430. The data communication system 410 may communicate with the source node(s) 420 and/or destination node(s) 430 over links, such as radio, satellite, network links, and/or through inter-process communication, for example. In certain embodiments, the data communication system 410 may communication with one or more source nodes 420 and/or destination nodes 430 over one or more tactical data networks.
The data communication system 410 may be similar to the communication system 150, described above, for example. In certain embodiments, the data communication system 410 is adapted to receive data from the one or more source nodes 420. In certain embodiments, the data communication system 410 may include one or more queues for holding, storing, organizing, and/or prioritizing the data. Alternatively, other data structures may be used for holding, storing, organizing, and/or prioritizing the data. For example, a table, tree, or linked list may be used. In certain embodiments, the data communication system 410 is adapted to communicate data to the one or more destination nodes 430.
The data received, stored, prioritized, processed, communicated, and/or otherwise transmitted by data communication system 410 may include a block of data. The block of data may be, for example, a packet, cell, frame, and/or stream of data. For example, the data communication system 410 may receive packets of data from a source node 420. As another example, the data communication system 410 may process a stream of data from a source node 420.
In certain embodiments, data includes a header and a payload. The header may include protocol information and time stamp information, for example. In certain embodiments, protocol information, time stamp information, content, and other information may be included in the payload. In certain embodiments, the data may or may not be contiguous in memory. That is, one or more portions of the data may be located in different regions of memory. In certain embodiments, data may include a pointer to another location containing data, for example.
Source node(s) 420 provide and/or generate, at least in part, data handled by the data communication system 410. A source node 420 may include, for example, an application, radio, satellite, or network. The source node 420 may communicate with the data communication system 410 over a link, as discussed above. Source node(s) 420 may generate a continuous stream of data or may burst data, for example. In certain embodiments, the source node 420 and the data communication system 410 are part of the same system. For example, the source node 420 may be an application running on the same computer system as the data communication system 410.
Destination node(s) 430 receive data handled by the data communication system 410. A destination node 430 may include, for example, an application, radio, satellite, or network. The destination node 430 may communicate with the data communication system 410 over a link, as discussed above. In certain embodiments, the destination node 430 and the data communication system 410 are part of the same system. For example, the destination node 430 may be an application running on the same computer system as the data communication system 410.
The data communication system 410 may communicate with one or more source nodes 420 and/or destination nodes 430 over links, as discussed above. In certain embodiments, the one or more links may be part of a tactical data network. In certain embodiments, one or more links may be bandwidth constrained. In certain embodiments, one or more links may be unreliable and/or intermittently disconnected. In certain embodiments, a transport protocol, such as TCP, opens a connection between sockets at a source node 420 and a destination node 430 to transmit data on a link from the source node 420 to the destination node 430.
In operation, data is provided and/or generated by one or more data sources 420. The data is received at the data communication system 410. The data may be received over one or more links, for example. For example, data may be received at the data communication system 410 from a radio over a tactical data network. As another example, data may be provided to the data communication system 410 by an application running on the same system by an inter-process communication mechanism. As discussed above, the data may be a block of data, for example.
In certain embodiments, the data communication system 410 may organize and/or prioritize the data. In certain embodiments, the data communication system 410 may determine a priority for a block of data. For example, when a block of data is received by the data communication system 410, a prioritization component of the data communication system 410 may determine a priority for that block of data. As another example, a block of data may be stored in a queue in the data communication system 410 and a prioritization component may extract the block of data from the queue based on a priority determined for the block of data and/or for the queue.
The prioritization of the data by the data communication system 410 may be used to provide QoS, for example. For example, the data communication system 410 may determine a priority for a data received over a tactical data network. The priority may be based on the source address of the data, for example. For example, a source IP address for the data from a radio of a member of the same platoon as the platoon the data communication system 410 belongs to may be given a higher priority than data originating from a unit in a different division in a different area of operations. The priority may be used to determine which of a plurality of queues the data should be placed into for subsequent communication by the data communication system 410. For example, higher priority data may be placed in a queue intended to hold higher priority data, and in turn, the data communication system 410, in determining what data to next communicate may look first to the higher priority queue.
The data may be prioritized based at least in part on one or more rules. As discussed above, the rules may be user defined. In certain embodiments, rules may be written in extensible markup language (�XML�) and/or provided via custom dynamically linked libraries (�DLLs�), for example. Rules may be used to differentiate and/or sequence data on a network, for example. A rule may specify, for example, that data received using one protocol be favored over data utilizing another protocol. For example, command data may utilize a particular protocol that is given priority, via a rule, over position telemetry data sent using another protocol. As another example, a rule may specify that position telemetry data coming from a first range of addresses may be given priority over position telemetry data coming from a second range of addresses. The first range of addresses may represent IP addresses of other aircraft in the same squadron as the aircraft with the data communication system 410 running on it, for example. The second range of addresses may then represent, for example, IP addresses for other aircraft that are in a different area of operations, and therefore of less interest to the aircraft on which the data communication system 410 is running.
In certain embodiments, the data communication system 410 does not drop data. That is, although data may be low priority, it is not dropped by the data communication system 410. Rather, the data may be delayed for a period of time, potentially dependent on the amount of higher priority data that is received. In certain embodiments, data may be queued or otherwise stored, for example, to help ensure that the data is not lost or dropped until bandwidth is available to send the data.
In certain embodiments, the data communication system 410 includes a mode or profile indicator. The mode indicator may represent the current mode or state of the data communication system 410, for example. As discussed above, the data communications system 410 may use rules and modes or profiles to perform throughput management functions such as optimizing available bandwidth, setting information priority, and managing data links in the network. The different modes may affect changes in rules, modes, and/or data transports, for example. A mode or profile may include a set of rules related to the operational needs for a particular network state of health or condition. The data communication system 410 may provide dynamic reconfiguration of modes, including defining and switching to new modes �on-the-fly,� for example.
Data is communicated via the data communication system 410. The data may be communicated to one or more destination nodes 430, for example. The data may be communicated over one or more links, for example. For example, the data may be communicated by the data communication system 410 over a tactical data network to a radio. As another example, data may be provided by the data communication system 410 to an application running on the same system by an inter-process communication mechanism.
FIG. 5 illustrates an example of a queue system 500 for QoS operating above the transport layer in accordance with an embodiment of the presently described technology. While FIG. 5 is illustrated and described in terms of a queue, it is understood that alternative data structures may be used to hold data and protocol mechanisms similar to the queue system 500. The queue system 500 includes one or more queues 510-515. The queue 510-515 includes an enqueue pointer 520 and a dequeue pointer 530. The queue 510-515 may also include data 540-541 and/or a close command 550, for example. In certain embodiments, the data 540-541 may include contiguous or non-contiguous portions of data. In certain embodiments, the data 540-541 may include one or more pointers to other locations containing data.
As shown in FIG. 5, queue 510 first illustrates an empty queue with no data enqueued. Then, one block of data 540 is enqueued in the queue 511. Next, queue 512 has two blocks of data 540-541 enqueued. Then, a close command 550 has been enqueued along with two blocks of data 540-541 in queue 513. The data blocks 540-541 are processed in the network while the close command 550 remains behind them in the queue 514. In certain embodiments, the data blocks 540-541 may be processed and transmitted in an order other than the order in which the blocks 540-541 were enqueued. Then, as shown in queue 515, the close command 550 is removed from the queue 515 and processed to close the data connection.
Thus, for example, a system, such as data communication system 410, may manage a connection opened between a source node 420 and a destination node 430. System 410 may enqueue data transmitted via the connection and also enqueue protocol commands, such as transport protocol commands (e.g., �open connection� commands and �close connection� commands). Protocol commands may be associated with a certain connection between nodes and with certain data. The system 410 helps to ensure that data associated with the connection is transmitted and/or otherwise processed before the protocol command is processed. Thus, for example, data being transmitted via a TCP socket connection between source node 420 and destination node 430 is transmitted via the socket connection before a close command is processed to terminate the connection. The close command is enqueued behind the data for the connection, and, although the data for the connection may be processed and/or transmitted in varying orders depending upon priority and/or other rules, the close command is not processed until completion of the data processing. Once data for the connection has been processed, the close command is processed to terminate the TCP socket connection.
In one embodiment, for example, a bandwidth-constrained network, such as a tactical data network, includes at least two communication nodes, such as an aircraft radio and a ground troop radio. The aircraft may transmit a message to the ground radio by activating or opening a TCP socket connection, for example, between the aircraft radio and the ground radio. Transmission of data between the aircraft radio and the ground radio then begins. Data is enqueued or otherwise temporarily stored during the transmission process in order to prioritize the data based on content, protocol, and/or other criteria. When the aircraft radio generates a close connection command to end the communication, the close command is stored or enqueued after the data to ensure that the data is prioritized and transmitted to the ground radio before the close command. Thus, the system helps to ensure that the communication connection is not prematurely ended, and data thereby lost, due to premature processing of the close command. However, other environment conditions may result in termination and/or interruption of the communication connection. Thus, queues and/or other data storage may be used to buffer data for resumed transmission in the event of an interruption in the communication connection.
FIG. 6 illustrates a flow diagram for a method 600 for communicating data in accordance with an embodiment of the present invention. The method 600 includes the following steps, which will be described below in more detail. At step 610, a connection is opened. At step 620, data is received. At step 630, data is enqueued. At step 640, a close command is enqueued. At step 650, data is dequeued and transmitted. At step 660, the close command is dequeued and executed. The method 600 is described with reference to elements of systems described above, but it should be understood that other implementations are possible.
At step 610, a connection is opened. For example, a connection is opened between two nodes in a communications network. For example, a TCP connection may be opened between node sockets.
At step 620, data is received. Data may be received at the data communication system 410, for example. The data may be received over one or more links, for example. The data may be provided and/or generated by one or more data sources 420, for example. For example, data may be received at the data communication system 410 from a radio over a tactical data network. As another example, data may be provided to the data communication system 410 by an application running on the same system by an inter-process communication mechanism. As discussed above, the data may be a block of data, for example.
In certain embodiments, the data communication system 410 may not receive all of the data. For example, some of the data may be stored in a buffer and the data communication system 410 may receive only header information and a pointer to the buffer. For example, the data communication system 410 may be hooked into the protocol stack of an operating system, and, when an application passes data to the operating system through a transport layer interface (e.g., sockets), the operating system may then provide access to the data to the data communication system 410.
At step 630, data is enqueued. Data may be enqueued by data communication system 410, for example. The data may be enqueued based on one or more rules or priorities established by the system 410, protocol used, and/or other mechanism, for example. The data may enqueued in the order in which it was received and/or in an alternate order, for example. In certain embodiments, data may be stored in one or more queues. The one or more queues may be assigned differing priorities and/or differing processing rules, for example.
Data in the one or more queues may be prioritized. The data may be prioritized and/or organized by data communication system 410, for example. The data to be prioritized may be the data that is received at step 620, for example. Data may be prioritized before and/or after the data is enqueued, for example. In certain embodiments, the data communication system 410 may determine a priority for a block of data. For example, when a block of data is received by the data communication system 410, a prioritization component of the data communication system 410 may determine a priority for that block of data. As another example, a block of data may be stored in a queue in the data communication system 410 and a prioritization component may extract the block of data from the queue based on a priority determined for the block of data and/or for the queue. The priority of the block of data may be based at least in part on protocol information associated and/or included in the block of data. The protocol information may be similar to the protocol information described above, for example. For example, the data communication system 410 may determine a priority for a block of data based on the source address of the block of data. As another example, the data communication system 410 may determine a priority for a block of data based on the transport protocol used to communicate the block of data. Data priority may also be determined based at least in part on data content, for example.
The prioritization of the data may be used to provide QoS, for example. For example, the data communication system 410 may determine a priority for a data received over a tactical data network. The priority may be based on the source address of the data, for example. For example, a source IP address for the data from a radio of a member of the same platoon as the platoon the data communication system 410 belongs to may be given a higher priority than data originating from a unit in a different division in a different area of operations. The priority may be used to determine which of a plurality of queues the data should be placed into for subsequent communication by the data communication system 410. For example, higher priority data may be placed in a queue intended to hold higher priority data, and in turn, the data communication system 410, in determining what data to next communicate, may look first to the higher priority queue.
The data may be prioritized based at least in part on one or more rules. As discussed above, the rules may be user defined and/or programmed based on system and/or operational constraints, for example. In certain embodiments, rules may be written in XML and/or provided via custom DLLs, for example. A rule may specify, for example, that data received using one protocol be favored over data utilizing another protocol. For example, command data may utilize a particular protocol that is given priority, via a rule, over position telemetry data sent using another protocol. As another example, a rule may specify that position telemetry data coming from a first range of addresses may be given priority over position telemetry data coming from a second range of addresses. The first range of addresses may represent IP addresses of other aircraft in the same squadron as the aircraft with the data communication system 410 running on it, for example. The second range of addresses may then represent, for example, IP addresses for other aircraft that are in a different area of operations, and therefore of less interest to the aircraft on which the data communication system 410 is running.
In certain embodiments, the data to be prioritized is not dropped. That is, although data may be low priority, it is not dropped by the data communication system 410. Rather, the data may be delayed for a period of time, potentially dependent on the amount of higher priority data that is received.
In certain embodiments, a mode or profile indicator may represent the current mode or state of the data communication system 410, for example. As discussed above, the rules and modes or profiles may be used to perform throughput management functions such as optimizing available bandwidth, setting information priority, and managing data links in the network. The different modes may affect changes in rules, modes, and/or data transports, for example. A mode or profile may include a set of rules related to the operational needs for a particular network state of health or condition. The data communication system 410 may provide dynamic reconfiguration of modes, including defining and switching to new modes �on-the-fly,� for example.
In certain embodiments, the prioritization of data is transparent to other applications. For example, the processing, organizing, and/or prioritization performed by the data communication system 410 may be transparent to one or more source nodes 420 or other applications or data sources. For example, an application running on the same system as data communication system 410, or on a source node 420 connected to the data communication system 410, may be unaware of the prioritization of data performed by the data communication system 410.
At step 640, a system or protocol command, such as a transport protocol open or close command, is enqueued. Thus, a protocol mechanism, such as a TCP close command, may be manipulated to be stored in one or more queues along with data. In certain embodiments, a close command for a connection may be stored in the same queue as data associated with the connection. Alternatively, the command may be stored in a different queue from associated data.
At step 650, data is dequeued. The data may be dequeued and transmitted, for example. The data dequeued may be the data received at step 620, for example. The data dequeued may be the data enqueued at step 630, for example. Data may be prioritized before and/or during transmission, as described above. Data may be communicated from the data communication system 410, for example. The data may be transmitted to one or more destination nodes 430, for example. The data may be communicated over one or more links, for example. For example, the data may be communicated by the data communication system 410 over a tactical data network to a radio. As another example, data may be provided by the data communication system 410 to an application running on the same system by an inter-process communication mechanism. Data may be transmitted via a TCP socket connection, for example.
At step 660, a command is dequeued. The command may be the command enqueued at step 640, for example. In certain embodiments, the command is dequeued after data associated with the command and/or a connection associated with the command has been dequeued and transmitted. For example, a close connection command may be dequeued after data associated with the connection has been dequeued and transmitted via the connection.
Thus, certain embodiments of the present invention provide systems and methods for queuing data and protocol mechanism commands for QoS. Certain embodiments provide a technical effect of helping to ensure that a connection is not prematurely closed by a protocol command before QoS and data transmission is completed for that connection.
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