JP6468560B2 - Wireless communication system and control method therefor, and communication control program - Google Patents

Wireless communication system and control method therefor, and communication control program Download PDF

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JP6468560B2
JP6468560B2 JP2015208407A JP2015208407A JP6468560B2 JP 6468560 B2 JP6468560 B2 JP 6468560B2 JP 2015208407 A JP2015208407 A JP 2015208407A JP 2015208407 A JP2015208407 A JP 2015208407A JP 6468560 B2 JP6468560 B2 JP 6468560B2
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wireless communication
communication
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JP2017085201A (en
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河村 憲一
憲一 河村
和宏 徳永
和宏 徳永
直樹 高谷
直樹 高谷
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日本電信電話株式会社
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  The present invention relates to a wireless communication system in which a Multi-RAT environment is established, and more particularly to a technique for improving the communication quality.
  In recent years, mobile communication has spread rapidly, and smart phones and tablet terminals equipped with cellular wireless communication and wireless LAN (Local Area Network) such as 3G (3rd Generation) and LTE (Long Term Evolution) are used. . Mobile communication will be further developed in the future, and one of the directions is HetNet (Heterogeneous Network) (see Non-Patent Document 1). This HetNet is not a single technology, but a system that forms a network by combining different technologies, wireless cells of various sizes, and various bands. Combining a plurality of radio technologies to form a HetNet is also called a Multi-RAT (Radio Access Technology) environment. FIG. 1 shows a state of a cell in a multi-RAT environment, and an example in which a small cell 20, a cell 30 by a wireless LAN, and a cell (millimeter wave or the like) 40 by a high frequency RAT are formed in a macro cell 10. Indicates. In such an environment, terminals and base stations mainly use a plurality of radio technologies and bands simultaneously to integrate communications. The method of integration differs depending on the layer to be integrated, but as an example of the form of integration in the network layer, a form of aggregation in an integrated base station having a plurality of RATs can be considered (see FIG. 2). As another form, a form in which the integrated management node and the base station are separately provided is also conceivable (see FIG. 3).
  An integrated form in the Multi-RAT environment shown in FIG. 2 will be described. As shown in FIG. 2, the integrated base station 100 includes a network function unit 110 for connecting to a network such as the Internet 500, a RAT function unit 120 that operates as an access point by providing different types of RAT functions, And an integrated management unit 130 for integrated management of the RAT function unit 120. Here, one of the RAT function units 120 is typically related to cellular communication forming a so-called macro cell, and the other RAT function units are formed in a narrower cell range than cellular communication, such as a wireless LAN. It is concerned.
  The terminal 300 includes a wireless communication function unit 310 for performing wireless communication with different types of RAT functions, an integrated wireless communication interface 320 that integrally manages each wireless communication function unit 310, a communication protocol stack 330, and an application 340. It has. The communication protocol stack 330 is a processing function unit implemented as a stack of a plurality of layers, and includes at least a transport layer and a network layer of the OSI reference model. Therefore, each wireless communication function unit 310 includes at least a processing function unit below the data link layer of the OSI (Open Systems Interconnection) reference model. The application 340 includes at least a processing function unit higher than the session layer of the OSI reference model.
  The integrated management unit 130 of the integrated base station 100 performs determination of the RAT function unit 120 to be used, packet allocation, and the like in communication between the terminal 300 and the server 510 on the Internet 500. Further, the integrated wireless communication interface 320 of the terminal 300 performs determination of the wireless communication function unit 310 to be used, packet allocation, and the like in communication with 510 on the Internet 500.
  Another integrated form in the Multi-RAT environment shown in FIG. 3 will be described. As shown in FIG. 3, the integrated management node 200 accommodates a plurality of radio base stations 400. The integrated management node 200 includes a network function unit 210 for connecting to a network such as the Internet 500, a network function unit 220 for connecting to each radio base station 400, and an integrated management unit for managing each radio base station 400 in an integrated manner. 230.
  The plurality of radio base stations 400 have different types of functional units and operate as access points. Here, one of the plurality of radio base stations 400 typically relates to cellular communication that forms a so-called macro cell, and the other radio base station 400 has a narrower cell range than cellular communication. For example, it relates to a wireless LAN.
  The configuration of the terminal 300 is the same as that described above with reference to FIG.
  In the communication between the terminal 300 and the server 510 on the Internet 500, the integrated management node 200 determines the wireless base station 400 to be used, allocates packets, and the like.
  On the other hand, a protocol represented by TCP / IP (Transmission Control Protocol / Internet Protocol) is used for general communication on the Internet. A transport layer protocol typified by TCP has a function of controlling a transmission amount according to network quality by a congestion control function for controlling a transmission packet amount and retransmission according to a congestion state of the network. These communication controls are performed end-to-end between the terminal and the server.
Jeanette Wannstrom, 1 other, "Heterogeneous Networks in LTE", 3GPP, [online], [searched September 17, 2015], Internet <URL: http://www.3gpp.org/technologies/keywords-acronyms / 1576-hetnet>
  In the Multi-RAT environment illustrated in FIGS. 2 and 3, in the communication performed between the server 510 on the Internet 500 and the terminal 300, the application on the terminal 300 and the server 510 and the protocol processing of the transport layer are performed. It is not possible to know that a plurality of radios are integrated in the route on the way, and this is done without being aware of this. Further, the application on the terminal 300 and the server 510 and the protocol processing of the transport layer determine the behavior based on information that can be known, such as end-to-end throughput, delay, and packet loss.
  However, in a multi-RAT environment, a plurality of wireless communications are used in combination according to the environment. Therefore, when the user is moving, the environment of the route fluctuates drastically, such as frequent addition / deletion of small cell RATs. To do. In the future, wireless communication technology is also expected to increase in diversity. For example, ultra-high-speed operation using millimeter waves, but operated in small cells, or cells that cannot be guaranteed with an unlicensed band but can be used at low cost. The characteristics vary depending on the RAT, such as a macro cell that can be used stably over a wide area. Further, wireless communication is characterized in that the communication speed and quality available to the user change drastically depending on the propagation principle and the communication situation of other users who share the same band. Therefore, there is a problem that the communication quality in the Multi-RAT environment cannot be sufficiently improved by the method in which the application and the transport layer control using only the End-to-End quality.
  As an example, as shown in FIG. 1, a terminal of a user 1 who is connected to a low-speed macro cell 10 while moving and enters the area of an ultra-high-speed spot cell 20, 30 adds its RAT. In the case of using the conventional TCP congestion control, it takes time to improve the communication speed up to an extremely high speed, so that there is a problem that a sufficient bandwidth cannot be used during the stay time of the spot cells 20 and 30. In addition, for the application, while the low-speed macro cell 10 stays, the moving image is transmitted with low image quality, but when entering the ultra-high-speed spot cells 20 and 30, it is desired to perform high-quality image transmission. Cannot be known immediately, and it is only possible to estimate that the end-to-end throughput has improved from the result after a certain amount of time has passed.
  Further, as another problem, which of the plurality of RATs is used to transmit a packet sent from an application is generally determined by integrated wireless communication in the integrated base station 100, the integrated management node 200, or the terminal 300. The scheduler function of the interface 320 is determined. At present, even if there is a request for use RAT from an application, it cannot be transmitted unless such a communication path and means are specially set. Therefore, there is a case where transmission is performed with a RAT that does not match the characteristics of the application at present, and there is a problem that communication quality is deteriorated.
  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a wireless communication system capable of obtaining high communication quality corresponding to a communication path in an environment where a plurality of wireless access functions can be used. The communication control method and program are provided.
In order to achieve the above object, a wireless communication system according to the present invention provides a wireless terminal device having a plurality of wireless communication function units for performing wireless communication with different types of wireless access functions, and a wireless terminal device. In a wireless communication system comprising a plurality of wireless access function units providing a wireless access function and an integrated management unit for managing each wireless access function unit in an integrated manner, a packet of a transport layer related to communication by the wireless communication terminal device An adding means for adding information on the radio access function unit to the header unit is provided.
The communication control method in the wireless communication system according to the present invention includes a wireless terminal device having a plurality of wireless communication function units for performing wireless communication with different types of wireless access functions, and wireless access to the wireless terminal device. A communication control method in a wireless communication system comprising a plurality of wireless access function units that provide functions and an integrated management unit that integrally manages each wireless access function unit , wherein the additional means of the wireless communication system includes the wireless communication A step of adding information related to a radio access function unit to a header part of a transport layer packet related to communication by a terminal device is provided.
  According to the present invention, it is possible to grasp what radio access function is used as a communication path in the transport layer and higher layers by referring to the additional information added to the header part of the transport layer. Therefore, communication control suitable for the wireless access function can be performed. Furthermore, since it becomes possible for a layer higher than the transport layer to designate a wireless access function as additional information, a wireless access function suitable for an application can be used. Thereby, high communication quality according to the communication path can be obtained.
Image diagram explaining the Multi-RAT environment The figure explaining an example of the integrated form in a Multi-RAT environment The figure explaining the other example of the integrated form in a Multi-RAT environment Configuration example for adding “available RAT information” Configuration example for adding “desired RAT information” Example of functional block of integrated base station Example of functional block of terminal Example of protocol stack The figure explaining an example of the utilization form of "usable RAT information" The figure explaining an example of the utilization form of "desired information of transmission RAT"
  A system according to an embodiment of the present invention will be described with reference to the drawings. The present invention is characterized in that information on a radio base station is added to the header part of the transport layer packet of the OSI reference model in the Multi-RAT environment. More specifically, as shown in FIG. 4 and FIG. 5, a field is prepared in which information related to a radio base station is added as additional information in an option field of a transport layer header such as TCP.
  In the present invention, there are two types of additional information. One is “desired RAT information”, and one is “usable RAT information”.
  FIG. 4 shows a configuration when “available RAT information” is added. In this case, RAT information that can be used for each terminal is described in the option field of the transport layer. In the example shown in FIG. 5, the option field is composed of the number of available RATs and the respective RAT information. The RAT information can describe part or all of information such as RAT technology, speed, cell radius, and the like.
  FIG. 5 shows a configuration example when “desired information of transmission RAT” is added. In this case, RAT information desired to be transmitted is described in the option field of the transport layer. In the description example shown in FIG. 4, the option field includes a field indicating a desired RAT designation method and a field of actual designation contents. In the field indicating the designation method, for example, designation by RAT technology, designation by speed, part or all of designation by cell radius can be considered, and the contents according to each designation method are described in the designation contents field. Is done.
  The present invention is characterized by cross-layer processing using these fields to transmit wireless RAT information as additional information to the transport layer.
  Next, a method for using the field will be described. First, a case where “available RAT information” is used as additional information will be described. The additional information is added by the integrated base station 100 shown in FIG. 2 or the integrated management node 200 shown in FIG. 3 when a packet received using wireless communication is transmitted to the network side. The integrated base station 100 and the integrated management node 200 manage RATs that can be used in units of terminals in real time and add the information. Alternatively, in use on the terminal 300 side, as shown in FIG. 2 and FIG. 3, integrated wireless, which is a function of integrating and managing packets received using wireless communication inside the terminal 300 and passing them to the communication protocol stack. Information is added by the communication interface 320.
  The configuration of the integrated base station 100 is shown in FIG. The integrated management unit 130 in the integrated base station 100 includes a RAT information management unit 131, which RAT can be used for each terminal, or RAT such as technical standard information, communication speed, and cell radius of each RAT. Manage information. Based on the information of the management unit 131, the option field adding unit 132 of the packet to be transmitted to the communication line adds “usable RAT information” and sends the packet to the communication line via the communication interface. The case of the integrated management node 200 is the same except that the integrated management unit 130 and the base station functions of each RAT are divided and deployed separately on the network. The addition of additional information by the option field adding unit 132 may be performed only when there is a change in the RAT that can be used by the terminal 300, or may be performed periodically.
  FIG. 7 shows the configuration of terminal 300. As in the case of the integrated base station 100, the integrated wireless communication interface unit 320 of the terminal 300 includes a RAT information management unit 321 and a packet option field adding unit 322. The packet option field adding unit 322 adds information to the field when a packet received wirelessly is passed to the upper protocol stack 330. The addition of the additional information by the option field adding unit 322 may be performed only when there is a change in the RAT that can be used by the terminal 300 or may be periodically performed.
  The protocol stack of the server 510 or the protocol stack 330 of the terminal 300 that has received the packet to which “available RAT information” is added reads the information in this option field, and via a socket or the like for the upper layer application And pass the optional information. Alternatively, this information is used in transport layer control.
  FIG. 8 shows a functional configuration example of the protocol stack. Note that this protocol stack is implemented in one or both of the terminals 300 of the server 510, and the configuration is common to both. FIG. 8 shows a functional block assuming that the congestion control algorithm is changed using “available RAT information” as an example of control. The transport layer protocol stack 620 obtains the packet passed from the network layer protocol stack 610 by the option field obtaining unit 621, and the obtained information is transferred to the application layer 700 via the inter-application I / F unit 622. hand over. On the other hand, the congestion control algorithm selection unit 623 selects the control algorithm for the transmission packet addressed to the corresponding terminal from the acquired “available RAT information” information, and changes the congestion control method to the congestion control unit 624. Instruct.
  Next, a method of using “desired information for transmission RAT” will be described. As shown in FIG. 8, the communication protocol stack 600 of the server 510 and the terminal 300 acquires the desired RAT request information of the application via the I / F unit 622 with the application layer 700. In the transport layer protocol stack 620, the option field adding unit 625 adds a field “desired information for transmission RAT” and passes it to the protocol stack 610 in the network layer. As an operation of the integrated base station 100 that has received the packet to which “desired information of transmission RAT” is added, the field information is acquired in the option field acquisition unit 133 of the received packet from the communication line as shown in FIG. In the RAT selection / packet distribution / aggregation unit 134, using the desired information, the RAT selection / packet distribution / aggregation unit 134 comprehensively determines other information and determines the RAT to be used. In addition, deleting the “desired information of the transmission RAT” when transferring to each RAT is also one embodiment. The case of the integrated management node 200 is the same except that the integrated management unit 130 and the base station functions of each RAT are divided and deployed separately on the network. Even in the case of the terminal 300, as shown in FIG. 7, the field of the packet passed from the communication protocol stack 330 is acquired by the option field acquisition unit 323 of the transmission packet, and the RAT selection / packet distribution / aggregation unit 324 The desired information is used to comprehensively determine other information, and the RAT to be used is determined. In this case as well, deleting the “desired information of the transmission RAT” when performing transfer to each RAT is also one embodiment.
  The present invention solves the problem by using the above technique. The actions and effects according to the present invention can be broadly divided into actions and effects by control using "usable RAT information" and actions and effects by control using "desired RAT information".
  The control using “usable RAT information” can be applied to the optimization of the transport layer control algorithm as shown in FIG. FIG. 9 shows an example of its use. The terminal sets communication with a server on the Internet while connected to the macro cell, and starts communication. When the terminal moves while being used and reaches a small cell area which is another RAT, the integrated use of the RAT is started. This small cell can be accessed at ultra-high speed, and if the congestion control algorithm of the transport layer that was used when using the macro cell is a control that gradually increases the speed, until the high speed is used up Takes time. For this reason, using this technology, the “usable RAT information” is added in the terminal, the integrated base station, or the integrated node to notify the transport layer of the switching to the high-speed RAT. Based on this information, the transport layer protocol stack changes the congestion algorithm to an algorithm that can increase the speed rapidly. Further, the RAT switching information is notified to the application. When leaving the small cell area, the RAT change is notified again, and the congestion algorithm is changed to a suitable one. In this way, control following the change in RAT becomes possible. Further, it is possible to change the behavior of the application by notifying the application of the change in RAT. For example, it is possible to detect the addition / deletion of high-speed RAT and change the streaming video rate. Or it can increase the pace of streaming caching when grabbing a fast cell. It is also possible to detect the grabbing of an unlicensed band cell and to distribute data such as advertisements that are not necessarily necessary for the user. By notifying the upper layer of the change in the RAT in this way, it is possible to control to further improve the user's QoE (Quality of Experience).
  An example of control using “desired information of transmission RAT” is shown in FIG. For example, when the application 810 on the server requests a wide area without instantaneous delay due to handover, for example, by real-time communication or the like, the present technology transmits information requesting selection of the RAT of the macro cell as “request for transmission RAT”. In addition to “information”, the integrated base station 100 selects an allocation RAT with reference to the information, and performs transmission using the RAT constituting the macro cell. In another application 820, in communication that is not very important but has a large amount of data, information that is operated in an unlicensed band such as Wi-Fi and that has a low communication cost is used as “request information for transmission RAT”. In addition, the integrated base station 100 selects an allocation RAT with reference to the information, and performs transmission using the RAT of the Wi-Fi cell or the small cell. The integrated management node 200 can perform the same processing. As described above, in the past, it was impossible for an application to determine which RAT is used for transmission, but it is possible to make a RAT selection more desired.
  The integrated management unit 130 of the integrated base station 100, the integrated management unit 230 of the integrated management node 200, the integrated wireless communication interface 320 of the terminal 300, and each part of the protocol stack 600 implemented in the terminal 300 and the server are as follows: It may be implemented as hardware or may be implemented by installing a program in a computer, and the implementation form is not limited as long as the functions of each unit can be exhibited.
  As mentioned above, although embodiment of this invention was explained in full detail, this invention is not limited to this. For example, in the above embodiment, TCP is exemplified as the transport layer protocol, but the present invention can be implemented with other protocols.
  In the above embodiment, the congestion control is described as an example of the control using the additional information in the transport layer protocol stack. However, the additional information can be used for other control.
DESCRIPTION OF SYMBOLS 100 ... Integrated base station 120 ... RAT function part 130 ... Integrated management part 131 ... RAT information management part 132 ... Option field addition part 133 ... Option field acquisition part 134 ... RAT selection / packet distribution / aggregation part 200 ... Integrated management node 230 ... Integrated management unit 300 ... Terminal 310 ... Wireless communication function unit 320 ... Integrated wireless communication interface 321 ... RAT information management unit 322 ... Option field addition unit 323 ... Option field acquisition unit 324 ... RAT selection / packet distribution / aggregation unit 330 ... Communication protocol Stack 340 ... Application 400 ... RAT base station 500 ... Internet 510 ... Server 600 ... Protocol stack 610 ... Network layer protocol stack 620 ... Transport layer protocol stack 6 1 ... option field obtaining unit 622 ... between the application I / F unit 623 ... congestion control algorithm selecting unit 624 ... congestion control unit 625 ... option field adding unit 700 ... Application layer

Claims (7)

  1. A wireless terminal device having a plurality of wireless communication function units for performing wireless communication with different types of wireless access functions, a plurality of wireless access function units providing a wireless access function to the wireless terminal device, and each wireless access In a wireless communication system including an integrated management unit that performs integrated management of functional units ,
    A wireless communication system, comprising: an adding unit that adds information related to a wireless access function unit to a header portion of a transport layer packet related to communication by the wireless communication terminal device.
  2. The additional information by the adding means includes information on a wireless access function unit that is currently available to the wireless communication terminal device,
    It said adding means, the radio access function portion is housed Rutotomoni the radio base station having the integrated management unit, or, with the integrated management unit together with the radio access function unit is integrated management of radio base stations accommodated The wireless communication system according to claim 1, wherein the wireless communication system is provided in an integrated management device or the wireless communication terminal device.
  3. Additional information by the adding means includes information relating to the wireless A click Seth functional unit that wishes to use,
    The wireless communication system according to claim 1, wherein the adding unit is provided in one or both of the wireless communication terminal device and a communication counterpart device of the wireless communication terminal device.
  4. Either one or both of the wireless communication terminal device and the communication counterpart device of the wireless communication terminal device includes additional information notification means for acquiring the additional information from the packet header of the transport layer and notifying the higher layer. The wireless communication system according to any one of claims 1 to 3.
  5. Either or both of the wireless communication terminal device and the communication partner device of the wireless communication terminal device acquire the additional information from the packet header of the transport layer and control packet processing in the transport layer based on the additional information The wireless communication system according to any one of claims 1 to 3, further comprising a control unit that performs the control.
  6. A wireless terminal device having a plurality of wireless communication function units for performing wireless communication with different types of wireless access functions, a plurality of wireless access function units providing a wireless access function to the wireless terminal device, and each wireless access A communication control method in a wireless communication system including an integrated management unit that performs integrated management of functional units ,
    In the wireless communication system, the adding means of the wireless communication system includes a step of adding information related to a wireless access function unit to a header part of a packet of a transport layer related to communication by the wireless communication terminal device Communication control method.
  7. The communication control program for functioning a computer as each means of the radio | wireless communications system as described in any one of Claims 1-5 .
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