KR20150048530A - Mobile terminal and data transmit method for the mobile terminal - Google Patents
Mobile terminal and data transmit method for the mobile terminal Download PDFInfo
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- KR20150048530A KR20150048530A KR1020130128721A KR20130128721A KR20150048530A KR 20150048530 A KR20150048530 A KR 20150048530A KR 1020130128721 A KR1020130128721 A KR 1020130128721A KR 20130128721 A KR20130128721 A KR 20130128721A KR 20150048530 A KR20150048530 A KR 20150048530A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/0278—Traffic management, e.g. flow control or congestion control using buffer status reports
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
Abstract
The present invention relates to a mobile terminal for transmitting and receiving data on a segment basis, and a data transmission method for the mobile terminal, comprising a buffer for temporarily storing segments to be transmitted among data segmented by segments, A wireless communication unit that transmits the segments to be transmitted to a destination terminal, and a wireless communication unit that determines the number of first transmittable segments based on the confirmation data received from the destination terminal, And a control unit for checking the number of second transmittable segments based on the data exchange state of the nodes, wherein the control unit checks an available buffer size of the buffering unit, which is determined according to the amount of pre-stored segments, The number of first transmittable segments and the phase Determines the number of segments that can be transmitted together using the second number of transmittable segments, and stores transmission target segments corresponding to the determined number of segments in the buffering unit.
Description
The present invention relates to a mobile terminal for transmitting and receiving data on a segment-by-segment basis, and a data transmission method for the mobile terminal.
The data transmission speed of the mobile terminal is increasing exponentially according to the development of technology and the needs of users. Thus, there is a tremendous amount of data exchange on the network over the past.
However, if more data is received than the amount of data that can be processed in the network where the data is exchanged, loss of data may occur. In order to maintain the reliability of data transmission, a variety of algorithms such as a flow control algorithm and a congestion control algorithm have emerged since reliable transmission can not be performed when such data loss occurs. Currently, research is actively carried out to maintain both data transmission speed and reliability of data transmission.
It is an object of the present invention to provide a mobile terminal capable of minimizing a decrease in data transmission speed caused by flow control or congestion control and a data transmission method for the mobile terminal.
It is another object of the present invention to provide a mobile terminal and a data transmission method of the mobile terminal, which can improve the data transmission speed of the mobile terminal without any extra cost or time wasted due to design changes.
A mobile terminal according to an embodiment of the present invention includes a buffer for temporarily storing transmission target segments among data segmented by a segment, a wireless communication unit for transmitting the transmission target segments to a destination terminal, Determining a number of first transmittable segments based on the acknowledgment data received from the destination terminal and determining a number of second transmittable segments based on the data exchange status of the intermediate nodes on the network path via the segments from the acknowledgment data Wherein the control unit checks the available buffer size of the buffering unit, which is determined according to the amount of pre-stored segments, and determines the available buffer size and the number of the first transmittable segments and the second transmittable segment And a control unit for determining the number of segments that can be transmitted together using the number of transmission segments and storing transmission target segments corresponding to the determined number of segments in the buffering unit.
In one embodiment, the controller compares the number of segments that can be stored in the buffering unit with the number of the second transmittable segments according to the size of the available buffer, And the number of segments that can be transmitted together is determined according to a smaller value by comparing the number of updated first transmittable segments with the number of updated second transmittable segments.
In one embodiment, the controller may further determine the number of segments that can be transmitted together by further reflecting the number of the intermediate nodes or the type of application driven in the mobile terminal.
In one embodiment, the controller selects at least a portion of the available buffer based on the number of the connected intermediate nodes or the type of the running application, and determines the number of segments that can be stored in at least a portion of the available buffer, The number of first transmittable segments and the number of second transmittable segments are compared to determine the number of transmittable segments together.
In one embodiment, the controller selects at least a portion of the available buffer according to a different predetermined ratio according to the type of the application being driven.
In one embodiment, the control unit may select at least a portion of the available buffer based on a ratio of the number of segments that can be stored in the buffering unit and the number of connected intermediate nodes according to the size of the available buffer .
In one embodiment, the control unit selects at least a portion of the available buffer based on subscriber information corresponding to the mobile terminal, and determines the number of segments that can be stored in at least a portion of the available buffer, And the number of segments that can be transmitted together is determined by comparing the number of segments and the number of second transmittable segments.
In one embodiment, the control unit may determine the number of segments that can be transmitted together for each of the acknowledgment data received in one round trip time (RTT), and determine the number of segments corresponding to the minimum of the determined number of segments And the transmission target segments are stored in the buffering unit.
A method for transmitting data to a destination terminal on a segment basis in a mobile terminal according to an embodiment of the present invention includes receiving at least one confirmation data from the destination terminal, Determining a number of first transmittable segments based on a congestion state of a network path for transmitting the segments and a second transmittable segment number based on a data exchange state of intermediate nodes via the segments, Checking an available buffer size of the buffering unit, which is determined according to an amount of a pre-stored segment, from a buffering unit provided in the terminal; and checking the available buffer size and the number of the first transmittable segments, The number of segments that can be transmitted together is determined Storing step, and the transmission target segment corresponding to a transmittable segment number with which the buffering unit, and characterized in that it comprises a step in which they transmit the transmission target segment stored in the buffering unit.
In one embodiment, the step of determining the number of segments that can be transmitted together is characterized by determining the number of segments that can be transmitted together based on Equation (1).
here,
The Swnd is the number of segments that can be transmitted together,
The Cwnd is the number of the first transmittable segments determined based on the confirmation data,
The updated Awnd is a smaller value among the number of second transmittable segments included in the acknowledgment data and the number of segments that can be stored in the buffering unit according to the available buffer size.
In one embodiment, the step of determining the number of segments that can be transmitted together includes selecting at least a portion of the available buffer, checking the number of segments that can be stored in at least a portion of the available buffer, And comparing the number of segments that can be stored in at least a portion of the available buffer with the number of first transmittable segments and the number of second transmittable segments to determine the number of transmittable segments together.
In one embodiment, the step of selecting at least a portion of the available buffer includes the steps of: checking an application currently running in the mobile terminal; checking a predetermined allocation ratio according to the application; And selecting at least a part of the available buffer based on the allocation ratio.
In one embodiment, the step of selecting at least a portion of the available buffer may include the steps of: checking the number of intermediate nodes connected to the mobile terminal; and determining the number of segments that can be stored in the buffering unit according to the size of the available buffer And selecting at least a portion of the available buffer based on a ratio of the number of segments that can be stored in the buffering unit and the number of connected intermediate nodes according to the size of the available buffer .
In one embodiment, the step of selecting at least a portion of the available buffer comprises the steps of: checking subscriber information of the mobile terminal; checking a predetermined allocation ratio based on the subscriber information; And selecting at least a portion of the available buffer based on the available buffer.
In one embodiment, the step of transmitting segments to be transmitted comprises: determining the number of segments that can be transmitted together for each of the acknowledgment data received in one round trip time (RTT) Selecting a minimum value by comparing the determined number of segments, storing transmission target segments corresponding to the minimum value in the buffering unit, and transmitting the transmission target segments stored in the buffering unit to the destination terminal .
A mobile terminal and a method for transmitting data of the mobile terminal according to an embodiment of the present invention prevent an overflow phenomenon due to loss of data to minimize the frequency of occurrence of congestion control or flow control, Thereby preventing a decrease in speed.
The mobile terminal and the data transmission method of the mobile terminal according to an embodiment of the present invention can adjust the amount of data transmitted from the transmitting terminal in consideration of the size of the available buffer, .
1 is a block diagram illustrating a mobile terminal according to an embodiment of the present invention.
2 is a conceptual diagram illustrating an operation procedure of a mobile terminal and a server according to an embodiment of the present invention.
3 is a flowchart illustrating a method of controlling a mobile terminal according to an exemplary embodiment of the present invention.
4 is a flowchart illustrating a method for determining the number of simultaneous transmission segments in a mobile terminal according to an exemplary embodiment of the present invention.
5 is a flowchart illustrating an example of determining the number of transmission segments by adjusting the size of an available buffer in a mobile terminal according to an exemplary embodiment of the present invention.
FIG. 6 is a flowchart illustrating an embodiment of allocating an available buffer allocation ratio based on subscriber information in a mobile terminal according to an embodiment of the present invention.
FIG. 7 is a flowchart for explaining an embodiment for determining the number of transmission segments by collecting a plurality of pieces of confirmation data in a mobile terminal according to an embodiment of the present invention.
8 is a conceptual diagram illustrating an example in which the number of concurrent transmission segments is changed according to the size of an available buffer in a mobile terminal according to an embodiment of the present invention.
FIGS. 9A and 9B are conceptual diagrams for illustrating improvement of data transmission speed in a mobile terminal according to an embodiment of the present invention.
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals refer to the same or similar elements, and redundant description thereof will be omitted. The suffix "module" and " part "for the components used in the following description are given or mixed in consideration of ease of specification, and do not have their own meaning or role. In the following description of the embodiments of the present invention, a detailed description of related arts will be omitted when it is determined that the gist of the embodiments disclosed herein may be blurred. In addition, it should be noted that the attached drawings are only for easy understanding of the embodiments disclosed in the present specification, and should not be construed as limiting the technical idea disclosed in the present specification by the attached drawings.
The mobile terminal described in this specification includes a mobile phone, a smart phone, a laptop computer, a digital broadcasting terminal, a personal digital assistant (Pda), a portable multimedia player (PMP), a navigation device, a slate PC, , Tablet Pc, Ultra book, and the like. However, it will be understood by those skilled in the art that the configuration according to the embodiments described herein may be applied to a fixed terminal such as a digital TV, a desktop computer, and the like, unless the configuration is applicable only to a mobile terminal.
1 is a block diagram illustrating a mobile terminal according to one embodiment disclosed herein.
The
Hereinafter, the components will be described in order.
The
The
The broadcast channel may include a satellite channel and a terrestrial channel. The broadcast management server may refer to a server for generating and transmitting broadcast signals and / or broadcast related information, or a server for receiving broadcast signals and / or broadcast related information generated by the broadcast management server and transmitting the generated broadcast signals and / or broadcast related information. The broadcast signal may include a TV broadcast signal, a radio broadcast signal, a data broadcast signal, and a broadcast signal in which a data broadcast signal is combined with a TV broadcast signal or a radio broadcast signal.
The broadcast-related information may refer to a broadcast channel, a broadcast program, or information related to a broadcast service provider. The broadcast-related information may also be provided through a mobile communication network. In this case, it may be received by the
The broadcast-related information may exist in various forms. For example, an EPG (Electronic Program Guide) of dMb (digital multimedia broadcasting) or an ESG (Electronic Service Guide) of digital Video broadcast-Handheld (dVb-H).
For example, the
The broadcast signal and / or broadcast related information received through the
The
The
The
The short-
The
1, an a / V (audio / video)
The image frame processed by the
The
The
The
The
The
The
Some of these displays may be transparent or light transmissive so that they can be seen through. This can be referred to as a transparent display, and a typical example of the transparent display is TOLEd (Transparent OLEd). The rear structure of the
There may be two or
(Hereinafter, referred to as a 'touch screen') in which a
The touch sensor may be configured to convert a change in a pressure applied to a specific portion of the
If there is a touch input to the touch sensor, the corresponding signal (s) is sent to the touch controller. The touch controller processes the signal (s) and transmits the corresponding data to the
Referring to FIG. 1, a proximity sensor may be disposed in an inner region of the mobile terminal or in the vicinity of the touch screen, which is enclosed by the touch screen. The proximity sensor refers to a sensor that detects the presence or absence of an object approaching a predetermined detection surface or a nearby object without mechanical contact using the force of an electromagnetic field or infrared rays. The proximity sensor has a longer life span than the contact sensor and its utilization is also high.
Examples of the proximity sensor include a transmission type photoelectric sensor, a direct reflection type photoelectric sensor, a mirror reflection type photoelectric sensor, a high frequency oscillation type proximity sensor, a capacitive proximity sensor, a magnetic proximity sensor, and an infrared proximity sensor. And to detect the proximity of the pointer by the change of the electric field along the proximity of the pointer when the touch screen is electrostatic. In this case, the touch screen (touch sensor) may be classified as a proximity sensor.
Hereinafter, for convenience of explanation, the act of recognizing that the pointer is positioned on the touch screen while the pointer is not in contact with the touch screen is referred to as "proximity touch & The act of actually touching the pointer on the screen is called "contact touch. &Quot; The position where the pointer is proximately touched on the touch screen means a position where the pointer is vertically corresponding to the touch screen when the pointer is touched.
The proximity sensor detects a proximity touch and a proximity touch pattern (e.g., a proximity touch distance, a proximity touch direction, a proximity touch speed, a proximity touch time, a proximity touch position, a proximity touch movement state, and the like). Information corresponding to the detected proximity touch operation and the proximity touch pattern may be output on the touch screen.
The
The
The
In addition to the vibration, the
The
The
The
The interface unit 170 serves as a path for communication with all external devices connected to the
The identification module is a chip for storing various information for authenticating the usage right of the
When the
The
The
The various embodiments described herein may be embodied in a recording medium readable by a computer or similar device using, for example, software, hardware, or a combination thereof.
In accordance with a hardware implementation, the embodiments described herein may be implemented as application specific integrated circuits (ASICs), digital signal processors (dSPs), digital signal processing devices (dSPds), programmable logic devices (PLds), field programmable gate arrays (FPGas) , Microprocessors, microprocessors, microprocessors, and other electronic units for carrying out other functions. In some cases, the embodiments described herein may be implemented by the
According to a software implementation, embodiments such as the procedures and functions described herein may be implemented with separate software modules. Each of the software modules may perform one or more of the functions and operations described herein.
The software code may be implemented in a software application written in a suitable programming language. The software code is stored in the
The
Here, the
The
In this case, when the transmitting terminal performs data transmission at a too high speed, the flow control may fail because the processing speed of the application of the receiving terminal can not follow the received data and the buffer is full and the segment can not be received Thereby preventing loss of data. In this case, the flow control algorithm allows the receiving terminal (the destination terminal or the intermediate node) to include in the acknowledgment data the information about the size of the buffers receivable by the receiving terminal (the destination terminal or the intermediate node) , That is, to prevent transmission of segments. Here, the receiving terminal can display the size of the buffer that it can receive by the number of receivable segments.
Congestion control is also intended to prevent loss of data that may occur when data is transmitted at a rate that is at or above a processing rate on a network path over which data is transmitted. For example, the user's data can be transmitted through a plurality of routers. If more data is received than the buffer size that the router can accommodate, the router will not be able to receive and forward the data (buffer overflow on a router). In this case, the transmitting terminal retransmits the data, that is, the segment, resulting in unnecessary network bandwidth waste due to retransmission. Therefore, in the transmitting terminal, congestion control is performed so that the network can transmit data at an acceptable rate, that is, the number of segments that the network can accommodate.
As such, the congestion control algorithm allows the network to transmit an acceptable number of segments. Here, the
For example, when the acknowledgment data (ACK) is transmitted from the destination terminal receiving the segment, the
Thus, the
Here, the
Alternatively, when the segment request information included in the confirmation data received from the destination terminal is duplicated, the
In this way, the
As described above, when data loss occurs, the slow start process can be resumed. Therefore, in order to prevent this, the
For example, the data reception state of the network may be determined depending on whether or not confirmation data transmitted from the destination terminal is received. That is, as described above, the
Meanwhile, the loss of data occurring on the network may occur according to the data exchange state of the intermediate nodes via the segments transmitted from the transmitting terminal. For example, if the buffer capacity of the intermediate nodes is sufficient and it is possible to buffer all the segments that flow into the network, a data overflow phenomenon may not occur and data loss may not occur. On the other hand, if buffer capacity of the intermediate nodes is insufficient to buffer the segments flowing into the network, a data overflow may occur and data loss may occur.
Accordingly, the
As described above, the
Also, as mentioned in the flow control, each intermediate node can indicate the size of the receivable buffer by the number of receivable segments and include it in the confirmation data. Therefore, the
Then, the
The
On the other hand, based on the size of the transmission window (Swnd) determined in consideration of the size of the Cwnd and the size of the Awnd for each round trip time, the
However, in the case of a conventional mobile terminal, the mobile terminal is not fixed but movable. Therefore, the mobile terminal may be located in a place where radio environment is poor, for example, a shade area such as a tunnel or a building, or a place where radio resources are insufficient, such as a deep mountain or continuation.
In this case, the transmission target segments temporarily stored in the buffering unit may not be transmitted according to the wireless environment around the mobile terminal. However, as described above, the Cwnd is determined based on the received confirmation data, and the Awnd is determined by the information included in the received confirmation data.
Therefore, the segment transmission state of the buffering unit has no influence on the determination of the Cwnd and Awnd sizes. Therefore, the mobile terminal continuously generates segments according to the number of segments determined from the size of Cwnd and the size of Awnd, regardless of the segment transmission state of the buffering unit, and the generated segments are temporarily stored in the buffering unit.
However, since the buffer capacity of the buffering unit is limited, the buffer capacity may become full. In this case, a data overflow phenomenon may occur even in the mobile terminal if the segments are continuously generated despite the fact that the segments can no longer be stored.
When a data overflow occurs in the mobile terminal, the slow start can be restarted by the above-described congestion control algorithm. Therefore, the slow start in which the size of the Cwnd is initialized again to 1 even though there is no problem in the data reception state of the network or the data exchange state of the intermediate nodes is resumed, and as a result, the data transmission speed is lowered.
This also occurs when the mobile terminal temporarily enters the shaded area and then exits again, that is, when the mobile terminal passes through an area such as a tunnel or the like. Therefore, in a typical mobile terminal, the data transmission speed is lowered due to the slow start regardless of whether the wireless environment is recovered or not.
In order to prevent such a decrease in the data transmission rate, the
More preferably, the number of extra segments that can be stored in the
FIG. 2 is a conceptual diagram illustrating an operation procedure of a mobile terminal and a server according to an embodiment of the present invention.
2, when the n-th acknowledgment data (ACK) 214 of the n-th segment 212 transmitted by the
That is, since the n-th confirmation data 214 has been received, the
The
Then, the
Therefore, in the case of the
Since the data overflow does not occur, a slow start due to the congestion control algorithm does not occur, so that the size of the Cwnd is not initialized to '1'. Therefore, when the
3 is a flowchart illustrating a method of controlling a mobile terminal according to an embodiment of the present invention.
3, when the data transmission is started, the
Here, the size of the Cwnd and the size of the Awnd may be determined based on the confirmation data received from the destination terminal, as described above. That is, the size of the Cwnd may be determined based on the number of confirmation data received from the destination terminal. The size of the Awnd may be determined based on the information included in the received confirmation data and the data exchange status information of the intermediate nodes.
On the other hand, if the size of the Cwnd and the size of the Awnd are determined in step S302, the
If the size of the available buffer, that is, the number of segments that can be stored in the
In step S306, the
Also, in step S306, it is possible to use at least a part of the size of the available buffer according to the type of the currently running application. That is, if the currently running application is required to perform real-time data transmission, the size of the available buffer is increased for faster data transmission, and if not, the size of the available buffer is reduced to prevent data overflow more stably It can also be done.
Also, the step S306 may determine the size of the available buffer according to the number of intermediate nodes currently connected (for example, the number of TCP connections) for the segment transmission. For example, if the number of intermediate nodes is large, the size of the available buffer may be reduced, or if the number of intermediate nodes is small, the size of the available buffer may be increased. An example in which the size of the available buffer is varied according to the number of application or connected intermediate nodes and the size of Swnd is determined according to the size of the available buffer will be described in more detail with reference to FIG.
In addition, the step S306 may be a step of providing a differentiating service supporting different data rates for each subscriber of the
It goes without saying that the confirmation data received in step S300 may be plural. In this case, the
On the other hand, if the size of Swnd is determined considering the size of the available buffer in step S306, the
At least one transmission target segment generated based on the size of the Swnd is temporarily stored in the
4 is a flowchart illustrating a method for determining the number of simultaneous transmission segments in a mobile terminal according to an exemplary embodiment of the present invention.
For example, the
The
The
For example, the step S404 may be performed according to the following equation (2).
The Awnd size is the number of transmittable segments determined according to the size of Awnd,
The available buffer size is the number of spare segments that can be stored in the buffering unit.
If the Awnd size is updated in step S404, the
Here, the size of the Awnd is updated in consideration of the size of the available buffer, as described in step S404. More specifically, the step S406 may be a step of comparing the size of the Cwnd with the size of the updated Awnd in step S404. Therefore, when the size of the available buffer is smaller than the size of the Awnd included in the confirmation data, the size of Awnd can be updated according to the number of segments according to the size of the available buffer. Since the size of the updated Awnd and the size of the Cwnd are compared with each other, when the number of segments according to the size of the updated Awnd, that is, the size of the available buffer is smaller than the size of the Cwnd, The size of Swnd can be determined.
Therefore, when the segments are accumulated in the
As described above, in the
For example, resizing of the available buffer may be used to more efficiently use limited radio resources. That is, a mobile terminal that requires fast and accurate data transmission / reception such as real-time multimedia transmission or stock trading may be connected to the network, and a mobile terminal that does not require real-time transmission such as e-mail or text message may be connected to the network Can be connected. If all of the mobile stations are allocated a fair share of radio resources, radio resources may be wasted.
Or the number of intermediate nodes connected for transmission of segments, for example, the number of TCP connections may be connected. Here, the number of TCP connections can determine the number of segments that can be transmitted at a time, that is, the transmission speed of data. Thus, if the number of TCP connections is large, a large number of segments can be transmitted in one round trip time, and if the number of TCP connections is small, a small number of segments can be transmitted in one round trip time.
However, if there are a large number of TCP connections, a large number of segments may be transmitted, but this can lead to data congestion by speeding up data entry on the network. Also, if the number of TCP connections is small, there is a need to transmit more segments to the currently connected intermediate node. Therefore, it may be necessary to control the data transmission rate based on the TCP connection, i.e., the number of connected intermediate nodes.
In the
5 is a flowchart illustrating an example of determining the number of transmission segments by adjusting the size of an available buffer in a mobile terminal according to an exemplary embodiment of the present invention.
Referring to FIG. 5, the
In step S500, the
For example, the
Meanwhile, the
If the allocation ratio of the available buffer is determined in step S502, the
Therefore, the size of Swnd can be determined according to the size of a portion of the available buffer amount based on the available buffer allocation ratio, the size of Awnd determined from the confirmation data, and the size comparison result of Cwnd. Therefore, when the size of a portion of the available buffer amount has the smallest value, the size of Swnd may be determined according to the size of a part of the available buffer amount.
Meanwhile, the method of adjusting the available buffer amount of the
For example, the
FIG. 6 is a flowchart illustrating an embodiment of allocating an available buffer allocation ratio based on subscriber information in a mobile terminal according to an embodiment of the present invention.
6, the
The
In step S604, the
On the other hand, in the above description, when confirmation data is received from the destination terminal, the size of the Cwnd is determined according to whether the confirmation data is received, that is, the number of the received confirmation data
Alternatively, however, it is of course also possible to combine all acknowledgment data received until one round trip time to determine the size of one swnd and thereby generate the segments to be transmitted at the next round trip time.
FIG. 7 is a flowchart for explaining an embodiment for determining the number of transmission segments by collecting a plurality of pieces of confirmation data in a mobile terminal according to an embodiment of the present invention.
7, if the available buffer size is checked in step S304, the
Here, the sizes of the plurality of Swnds may be different from each other. Even if the destination of the segments is the same as the destination node, since the intermediate nodes on the network path to the destination node are different from each other, even if the size of the Cwnd and the size of the available buffer are equal to each other, It is because. Therefore, if the data exchange status of a particular intermediate node via some of the segments is poor, this can be reflected in the size of the Awnd, and thus the size of the Swnd can also be reduced.
However, in this case, even if the size of the small Swnd is determined according to the size of the small Awnd, if the size of Swnd determined from the next confirmation data is large, the
Accordingly, in order to prevent such a data overflow phenomenon, the
If the size of the Swnd is determined in step S704, the
8 is a conceptual diagram illustrating an example in which the number of concurrent transmission segments is changed according to the size of an available buffer in a mobile terminal according to an embodiment of the present invention. 8 is a diagram for explaining a case where the total storage capacity of the
Referring to FIG. 8, when ACK, i.e., four acknowledgment data is received (800), the
Accordingly, the size of Awnd may be '20'. Then, the
Accordingly, in the
On the other hand, when eight segments arrive at the destination terminal, eight acknowledgment data (ACK) can arrive (804). When eight pieces of confirmation data are received, the size of Cwnd can be determined to be 16 by the above-mentioned congestion control algorithm. In this case, when the size of the Awnd and the size of the available buffer are equal to '20', the size of the Swnd can be determined to be '16', which is the minimum value of the size of the updated Awnd and the size of the determined Cwnd. Accordingly, 16 segments can be stored in the
If the
Accordingly, when the segments are loaded due to the shadow area, the
Accordingly, the
If the
When all acknowledgment data (ack) are received for the transmitted 20 segments, the
Therefore, in the present invention, even when the mobile terminal enters the shadow area, no data overflow occurs. Therefore, the slow start by the congestion control algorithm scheme is not resumed. In addition, since the value of Cwnd is not initialized as described in FIG. 8, segments can be generated and transmitted as many as the size of the Awnd and the size of the available buffer allow. Therefore, the mobile terminal according to the embodiment of the present invention can have a higher data transmission rate.
FIGS. 9A and 9B illustrate magnitudes of Swnd determined in a conventional mobile terminal and a mobile terminal according to an embodiment of the present invention, as shown in FIG. 8. FIG.
Referring to FIG. 9A, which assumes the case of a conventional mobile terminal, when entering the
Therefore, when data overflow occurs, congestion control using slow start is started by the congestion control algorithm method. Therefore, as slow start is restarted as shown in FIG. 9A, the magnitude of Cwnd is initialized again to 1. As a result, the data transmission speed is lowered.
On the other hand, in the
8, when the
Therefore, since the slow start does not occur, the size of the Cwnd is not initialized. Accordingly, as shown in FIG. 9B, when the wireless environment around the
Further, according to the embodiment disclosed herein, the above-described method can be implemented as a code that can be read by a processor on a medium on which the program is recorded. Examples of the medium that can be read by the processor include ROM, RaM, cd-ROM, magnetic tape, floppy disk, optical data storage, etc., and may be implemented in the form of a carrier wave (e.g., transmission over the Internet) .
While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Particularly, in the embodiment of the present invention, when the confirmation data is received, the magnitude of the Awnd is determined from the received confirmation data and the size of the Swnd is determined using the size of the Awnd. However, It is of course also possible to determine the size and use it to determine the size of the Swnd.
According to the above description, the size of the Swnd may be the number of transmission segments to be transmitted at the next round trip time. However, if the size of the available buffer is '0', the size of Awnd may be updated to '0', and the size of Swnd may also be determined to be '0'. If the size of Swnd is '0', the
However, when the wireless environment around the
Accordingly, the
Meanwhile, in the above description, the size of Swnd is determined considering the size of the available buffer in the mobile terminal. However, if the mobile terminal is connected to the network, the size of Swnd is determined by the service provided from the network Of course, be determined.
For example, when the mobile terminal is connected to the network, the mobile terminal may transmit control information for determining the size of the Swnd to the network management server through the network. For example, the control information may include information on whether to consider the size of the available buffer to determine the size of the Swnd or the type of a specific application.
When the control information is received, the network management server can determine the size of the Swnd of the mobile terminal according to the received control information. For example, the network management server may transmit information on a specific available buffer allocation ratio to the mobile terminal according to the number of TCP connections connected to the mobile terminal. Then, the mobile terminal can determine the size of the Swnd considering the received available buffer allocation ratio.
Alternatively, the network management server may transmit information on different available buffer allocation ratios to the mobile terminal depending on the type of application currently being executed by the mobile terminal. For example, the mobile terminal may pre-designate at least one application in the control signal. When at least one of the designated applications (for example, a video streaming service) is driven in the mobile terminal, the network management server may transmit information on the available buffer allocation ratio preset in the currently running application to the mobile terminal have. The mobile terminal may then determine the size of the Swnd according to an embodiment of the present invention while using the video streaming service.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the essential characteristics thereof. Therefore, the embodiments disclosed in the present invention are not intended to limit the scope of the present invention but to limit the scope of the technical idea of the present invention. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.
Claims (15)
A wireless communication unit for transmitting the transmission target segments to a destination terminal; And
Determining the number of first transmittable segments based on the acknowledgment data received from the destination terminal and checking the number of second transmittable segments based on the data exchange status of the intermediate nodes on the network path via the segments from the acknowledgment data And a control unit,
Wherein,
Checks the available buffer size of the buffering unit determined according to the amount of pre-stored segments, and determines the number of segments that can be transmitted together using the available buffer size, the number of first transmittable segments and the number of second transmittable segments And storing the transmission target segments corresponding to the determined number of segments in the buffering unit.
The number of segments that can be stored in the buffering unit is compared with the number of second transmittable segments according to the size of the available buffer, and the number of second transmittable segments is updated according to a small value,
Wherein the mobile terminal determines the number of segments that can be transmitted together by comparing the number of updated first transmittable segments with the number of updated second transmittable segments and based on a smaller value.
Wherein the number of segments that can be transmitted together is determined by further reflecting the number of the intermediate nodes or the type of application driven in the mobile terminal.
Selecting at least a portion of the available buffers based on the number of connected intermediate nodes or the type of the running application,
And comparing the number of segments that can be stored in at least a portion of the available buffer with the number of first transmittable segments and the number of second transmittable segments to determine the number of transmittable segments together.
And selects at least a portion of the available buffer according to a different predetermined ratio according to the type of the application being driven.
Wherein at least a portion of the available buffer is selected based on a ratio of the number of segments that can be stored in the buffering unit and the number of connected intermediate nodes according to the size of the available buffer.
Selecting at least a portion of the available buffer based on subscriber information corresponding to the mobile terminal,
Wherein the mobile terminal determines the number of segments that can be transmitted together by comparing the number of segments that can be stored in at least a portion of the available buffer with the number of first transmittable segments and the number of second transmittable segments.
Determining the number of segments that can be transmitted together for each of the acknowledgment data received in one round trip time (RTT)
And stores the transmission target segments corresponding to the minimum of the determined number of segments in the buffering unit.
Receiving at least one confirmation data from the destination terminal;
Determining from the received acknowledgment data a first number of transmittable segments based on a congestion state of a network path for transmitting the segments and a second transmittable segment number based on a data exchange state of intermediate nodes via the segments, ;
Checking an available buffer size of the buffering unit, which is determined according to an amount of a pre-stored segment, from a buffering unit provided in the mobile terminal;
Comparing the available buffer size with the number of first transmittable segments and the number of second transmittable segments to determine the number of transmittable segments together,
And storing transmission target segments corresponding to the number of segments that can be transmitted together in the buffering unit and transmitting transmission target segments stored in the buffering unit.
And the number of segments that can be transmitted together is determined based on the following equation (4).
&Quot; (4) "
here,
The Swnd is the number of segments that can be transmitted together,
The Cwnd is the number of the first transmittable segments determined based on the confirmation data,
The updated Awnd is a smaller value among the number of second transmittable segments included in the acknowledgment data and the number of segments that can be stored in the buffering unit according to the available buffer size.
Selecting at least a portion of the available buffer;
Checking the number of storable segments in at least a portion of the available buffer; And
And comparing the number of segments that can be stored in at least a portion of the available buffer with the number of first transmittable segments and the number of second transmittable segments to determine the number of segments that can be transmitted together Data transmission method.
Checking an application currently running in the mobile terminal;
Checking a predetermined allocation ratio according to the application; And
And selecting at least a portion of the available buffer based on the allocation ratio.
Checking the number of intermediate nodes connected to the mobile terminal;
Checking the number of segments that can be stored in the buffering unit according to the size of the available buffer; And
And selecting at least a portion of the available buffer based on the ratio of the number of segments that can be stored in the buffering unit to the number of connected intermediate nodes according to the size of the available buffer.
Confirming subscriber information of the mobile terminal;
Confirming a predetermined allocation ratio based on the subscriber information; And
And selecting at least a portion of the available buffer based on the allocation ratio.
Determining the number of transmittable segments for each of the acknowledgment data received at one round trip time (RTT);
Comparing the determined number of segments to select a minimum value;
Storing transmission target segments corresponding to the minimum value in the buffering unit; And
And transmitting the transmission target segments stored in the buffering unit to the destination terminal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020130128721A KR20150048530A (en) | 2013-10-28 | 2013-10-28 | Mobile terminal and data transmit method for the mobile terminal |
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| Application Number | Priority Date | Filing Date | Title |
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| KR1020130128721A KR20150048530A (en) | 2013-10-28 | 2013-10-28 | Mobile terminal and data transmit method for the mobile terminal |
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| KR20150048530A true KR20150048530A (en) | 2015-05-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20170014967A (en) * | 2015-07-31 | 2017-02-08 | 삼성전자주식회사 | Apparatus and method for controlling data transmission speed in wireless communication system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20170014967A (en) * | 2015-07-31 | 2017-02-08 | 삼성전자주식회사 | Apparatus and method for controlling data transmission speed in wireless communication system |
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