JP4850600B2 - Wireless terminal apparatus and channel control method - Google Patents

Description

  The present invention relates to a radio terminal apparatus and a channel control method, and more particularly to a radio terminal apparatus capable of setting a plurality of link layer channels and a channel control method used in the radio terminal apparatus.

  Conventionally, so-called MAC channel aggregation is known in which throughput is improved by using a plurality of MAC channels, which are communication channels set in a medium access control (MAC) layer, together (see Patent Document 1).

  For example, in a wireless communication system compliant with the iBurst (registered trademark) standard, MAC channel aggregation may be performed by using one to three MAC channels together between a wireless base station and a wireless terminal device. it can.

In addition, the wireless terminal device sets a link layer channel (logical channel) configured using such a MAC channel. The link layer channel is used between devices (for example, telephone terminals) that execute applications (for example, IP phones) that use the link layer channel. For example, as defined in 3GPP2 (X.S0011-004-D of third generation partnership project 2), a method for setting different link layer channels for each application in the same wireless terminal device is also known.
Japanese Patent Laying-Open No. 2005-252897 (page 7, FIG. 2)

  By the way, in recent years, even in the wireless communication system as described above, it is common to relay data transmitted and received by an application that is required to suppress transmission delay, such as voice data in which a voice band signal is encoded. It's getting on.

  On the other hand, data that is transmitted and received by an application that is required to ensure throughput and prevent loss of data to be relayed is relayed, of course, although transmission delay is not severe, such as file transfer and e-mail.

  When applications having different communication quality (QoS) required are relayed using different link layer channels, the profile of the MAC channel constituting each link layer channel (for example, retransmission control such as ARQ is executed) Therefore, there is a problem that a link layer channel corresponding to the communication quality required by the application cannot be set.

  Therefore, the present invention has been made in view of such a situation, and when setting a link layer channel for each application, according to the communication quality required by the application, the MAC channel constituting the link layer channel is determined. It is an object of the present invention to provide a wireless terminal device and a channel control method capable of changing a profile.

  In order to solve the problems described above, the present invention has the following features. First, the first feature of the present invention is configured by MAC channels (MAC channels C21 to C23) which are communication layers at a MAC layer level set with a radio base station (radio base station 100), and an application (FTP application A2). , VoIP application A1) sets a logical channel (link layer channel C11, C12) used for relaying data transmitted and received for each application, and the application requests the logical channel setting unit (link layer channel processing unit 203). A profile determination unit (profile determination unit 205) that determines a profile of the MAC channel (for example, presence or absence of automatic retransmission control) that affects the communication quality based on communication quality (for example, transmission delay) to be performed, and the profile Decision part Therefore, based on the determined said profile, and summarized in that the a radio terminal apparatus and a channel controller (channel control unit 207) for controlling transmission and reception of the data in the MAC channel.

  According to such a wireless terminal device, the profile of the MAC channel that affects the communication quality is determined based on the communication quality requested by the application. Further, transmission / reception of data in the MAC channel is controlled based on the determined profile.

  For this reason, when a logical channel, specifically a link layer channel, is set for each application, the profile of the MAC channel constituting the link layer channel can be changed according to the communication quality required by the application. That is, according to such a wireless terminal device, it is possible to set a link layer channel according to the communication quality required by the application.

  The second feature of the present invention relates to the first feature of the present invention, wherein the automatic retransmission control of the data is used in the MAC channel, and the channel control unit is determined by the profile determination unit. The gist is to determine whether or not to execute the automatic retransmission control based on the profile.

  A third feature of the present invention relates to the second feature of the present invention, wherein the channel control unit configures the logical channel used by the application when the application requests suppression of transmission delay. The gist is to stop the execution of the automatic retransmission control in the MAC channel.

  A fourth feature of the present invention is according to the first feature of the present invention, wherein the logical channel setting unit executes MAC channel aggregation for setting the logical channel by using a plurality of the MAC channels collectively. In summary, the channel control unit determines whether or not to execute the MAC channel aggregation based on the profile determined by the profile determination unit.

  A fifth feature of the present invention relates to the fourth feature of the present invention, wherein the channel control unit executes the MAC channel aggregation when the application requests an increase in throughput. To do.

  A sixth feature of the present invention relates to the first feature of the present invention, wherein the packet transmitted using the logical channel (IP packet P) has sequence information (sequence) capable of determining the transmission sequence of the packet. No. SN) is added, and the channel control unit determines whether to add the sequence information to the packet based on the profile determined by the profile determination unit.

  A seventh feature of the present invention relates to the sixth feature of the present invention, wherein the channel control unit does not execute MAC channel aggregation for setting the logical channel using a plurality of the MAC channels collectively, The gist is to stop adding the order information in the MAC channel constituting the logical channel used by the application.

  According to an eighth aspect of the present invention, a logical channel that is configured by a MAC channel, which is a MAC channel level communication channel set with a wireless base station, is used for each application to relay data transmitted and received by the application. Determining a profile of the MAC channel that affects the communication quality based on the communication quality required by the application, and transmitting and receiving the data on the MAC channel based on the determined profile. And a step of controlling the channel control method.

  A ninth feature of the present invention relates to the eighth feature of the present invention, wherein the automatic retransmission control of the data is used in the MAC channel, and the controlling step is based on the determined profile. The gist is to determine whether or not to execute the automatic retransmission control.

  A tenth aspect of the present invention relates to the ninth aspect of the present invention, wherein, in the step of controlling, the logical channel used by the application is configured when the application requests suppression of transmission delay. The gist is to stop the execution of the automatic retransmission control in the MAC channel.

  An eleventh feature of the present invention relates to the eighth feature of the present invention, wherein, in the step of setting the logical channel, a MAC channel aggregation for setting the logical channel is performed using a plurality of the MAC channels collectively. The controlling step is to determine whether to perform the MAC channel aggregation based on the determined profile.

  A twelfth feature of the present invention relates to the eleventh feature of the present invention, and is characterized in that, in the controlling step, the MAC channel aggregation is executed when the application requests an increase in throughput. To do.

  A thirteenth feature of the present invention relates to the eighth feature of the present invention, wherein order information capable of determining a transmission order of the packets is added to a packet transmitted using the logical channel, The gist of the controlling step is to determine whether or not to add the order information to the packet based on the determined profile.

  A fourteenth feature of the present invention relates to the thirteenth feature of the present invention, wherein, in the controlling step, when MAC channel aggregation for setting the logical channel is not performed by using a plurality of the MAC channels collectively, The gist is to stop adding the order information in the MAC channel constituting the logical channel used by the application.

  According to the features of the present invention, when a link layer channel is set for each application, a wireless terminal device capable of changing the profile of the MAC channel constituting the link layer channel according to the communication quality required by the application, and A channel control method can be provided.

  Next, an embodiment of the present invention will be described. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic and ratios of dimensions and the like are different from actual ones.

  Accordingly, specific dimensions and the like should be determined in consideration of the following description. Moreover, it is a matter of course that portions having different dimensional relationships and ratios are included between the drawings.

(Overall schematic configuration of communication system)
FIG. 1 is an overall schematic configuration diagram of a communication system according to the present embodiment. As illustrated in FIG. 1, the communication system according to the present embodiment includes a radio base station 100 and a radio terminal device 200. The radio base station 100 and the radio terminal device 200 execute radio communication conforming to the iBurst (registered trademark) standard using TDMA and SDMA / TDD communication schemes.

  The radio base station 100 is connected to the Internet 10. The radio base station 100 is connected to the PDSN 20. The PDSN 20 executes control of the communication path of the IP packet P and the like. A SIP server 50, a telephone terminal 60 and an FTP server 70 are connected to the Internet 10.

  In addition, a PC 30 and a telephone terminal 40 are connected to the wireless terminal device 200. In the present embodiment, the PC 30 can access the FTP server 70, execute file transfer according to FTP (file transfer protocol), and send and receive IP packets P accompanying file transfer.

  The telephone terminal 40 and the telephone terminal 60 are IP telephone terminals that support SIP (session initiation protocol). The telephone terminal 40 and the telephone terminal 60 execute call processing via the SIP server 50, and transmit / receive IP packets P (VoIP packets) including voice data.

(Configuration example of protocol stack and logical channel of communication system)
FIG. 2 shows the protocol stack of the communication system described above. FIG. 3 shows a configuration example of a link layer channel (logical channel) set in the communication system described above.

  Specifically, FIG. 2 shows a protocol stack of each device when an IP packet P (VoIP packet) is transmitted and received between the telephone terminal 40 and the telephone terminal 60. As shown in FIG. 2, the telephone terminal 40 forms a connection with the PDSN 20 by a point-to-point protocol (PPP).

  Further, as shown in FIG. 3, a link is established between the telephone terminal 40 and the telephone terminal 60 by using the connection and the MAC channel C23 set between the wireless base station 100 and the wireless terminal device 200. Layer channel C12 is set. The IP packet P is transmitted / received using the link layer channel C12. The telephone terminal 40 and the telephone terminal 60 execute a VoIP application A1 that realizes encoding of a voice band signal, conversion of encoded data and the IP packet P, and the like.

  That is, the link layer channel C12 is configured by the MAC channel C23, and is used for relaying data transmitted and received by the VoIP application A1.

  In the telephone terminal 40 and the telephone terminal 60, the ITU-TG. An audio codec conforming to 729A (8 kbps) is used. When the output (payload) of two voice codecs is set to be assigned to one IP packet P using RTP / UDP / IP, the IP packet P of about 60 bytes is relayed every 20 msec in the link layer channel C11. . In consideration of the overhead below the link layer (LL), data of about 27 kbps is transmitted and received between the telephone terminal 40 and the telephone terminal 60.

  Further, when the IP packet P is transmitted and received between the PC 30 and the FTP server 70, a protocol stack similar to the protocol stack shown in FIG. 2 is used, although the protocol stack of the layer higher than the PPP layer is different. A link layer channel C11 is set between the PC 30 and the FTP server 70 using a PPP connection and MAC channels C21 and C22 set between the radio base station 100 and the radio terminal device 200. In the PC 30 and the FTP server 70, an FTP application A2 that implements a function as an FTP client or FTP server is executed.

  That is, the link layer channel C11 is configured by the MAC channels C21 and C22, and is used for relaying data transmitted and received by the FTP application A2.

  That is, in the present embodiment, the radio base station 100 and the radio terminal device 200 can set different link layer channels for each application.

  The MAC channels C21 to C23 are MAC layer level communication channels set between the radio base station 100 and the radio terminal device 200. The MAC channels C21 to C23 are set by control in the link access control (LAC) layer.

  In the present embodiment, the radio base station 100 and the radio terminal device 200 can execute so-called MAC channel aggregation using a plurality of MAC channels collectively. When setting the link layer channel, the radio terminal device 200 displays information indicating the number of MAC channels used for configuring the link layer channel and the profile of the MAC channel (for example, presence or absence of automatic retransmission control). 100 is notified. The radio base station 100 sets a link layer channel based on the notification received from the radio terminal device 200.

  Furthermore, in the present embodiment, a sequence number SN (order information) capable of determining the transmission order can be added to the MAC layer frame transmitted using the link layer channels C11 and C12. Specifically, the sequence number SN is added between the radio base station 100 and the radio terminal device 200, that is, in the MAC channels C21 to C23. Several bits to several bytes are assigned to the sequence number SN. The sequence number SN is used for determining the transmission order of the frame on the receiving side when MAC channel aggregation for transmitting and receiving data through a plurality of MAC channels is executed.

  Further, automatic retransmission control (ARQ) of data included in the IP packet P is used between the radio base station 100 and the radio terminal device 200, that is, in the MAC channels C21 to C23.

(Function block configuration)
Next, a functional block configuration of the above-described wireless terminal device 200 will be described. The wireless terminal device 200 determines the MAC channel profile (for example, the presence or absence of ARQ) based on the communication quality (QoS) required by the application (VoIP application A1, FTP application A2). Further, the wireless terminal device 200 controls transmission / reception of data on the MAC channel, specifically, the IP packet P, based on the determined profile.

  FIG. 4 is a functional block configuration diagram of the wireless terminal device 200. As shown in FIG. 4, the wireless terminal device 200 includes a wireless communication unit 201, a link layer channel processing unit 203, a profile determination unit 205, a channel control unit 207, a storage unit 209, and wired LAN interface units 211A and 211B.

  The wireless communication unit 201 transmits and receives wireless signals that are compliant with iBurst. Specifically, the wireless communication unit 201 is connected to the link layer channel processing unit 203, and a baseband signal including the IP packet P output from the link layer channel processing unit 203 is converted into a predetermined modulation scheme (for example, 12QAM). Radio communication section 201 demodulates the received radio signal into a baseband signal and outputs the demodulated baseband signal to link layer channel processing section 203.

  The link layer channel processing unit 203 sets a link layer channel in response to a link layer channel setting request. In the present embodiment, the link layer channel processing unit 203 sets the link layer channel C11 for the VoIP application A1. Further, the link layer channel processing unit 203 sets the link layer channel C12 for the FTP application A2.

  In the present embodiment, the link layer channel processing unit 203 configures a logical channel setting unit that sets a link layer channel for each application.

  Further, the link layer channel processing unit 203 can execute MAC channel aggregation for setting a link layer channel using a plurality of MAC channels collectively. Specifically, as illustrated in FIG. 3, the link layer channel processing unit 203 sets the link layer channel C11 using the MAC channels C21 and C22.

  The profile determination unit 205 determines a MAC channel profile (for example, presence / absence of automatic retransmission control) that affects the communication quality based on the communication quality required by the application (for example, suppression of transmission delay).

  The profile determination unit 205 determines a MAC channel profile based on the MAC channel control parameter stored in the storage unit 209.

  Here, FIG. 6 shows an example of the MAC channel control parameter stored in the storage unit 209. As shown in FIG. 6, in the present embodiment, “for PC” and “for IP phone” are prepared as the types of link layer channels configured by MAC channels. “For PC” indicates that the parameter is applied to the PC 30 (see FIG. 3) connected to the wired LAN interface unit 211A (port A in the figure). “For IP phone” indicates that the parameter is applied to the telephone terminal 40 (see FIG. 3) connected to the wired LAN interface unit 211B (port B in the figure).

  In “for PC”, automatic retransmission control (ARQ) is determined as “present” as the profile of the MAC channel. In order to secure throughput, the maximum number of MAC channels used for aggregation is determined to be “3”. In addition, since “for PC” performs MAC channel aggregation, the addition of the sequence number SN that can determine the transmission order of the IP packets P is determined to be “present”.

  On the other hand, in “for IP phone”, in order to suppress transmission delay, automatic retransmission control (ARQ) is determined as “none” as a MAC channel profile. In voice data transmission / reception (VoIP), since high throughput is not required, it is determined that the maximum number of MAC channels used for aggregation is “1”, that is, MAC channel aggregation is not performed. In addition, in “for IP phone”, since the MAC channel aggregation is not executed, the addition of the sequence number SN that can determine the transmission order of the IP packet P is determined as “none”.

  As described above, the VoIP application A1 requires suppression of transmission delay as communication quality. That is, in a voice call, a single missing IP packet P is not a big problem, but a delay in arrival of the IP packet P due to a transmission delay is prominent as a deterioration of voice quality. For this reason, for the VoIP application A1, a MAC channel profile is set in consideration of suppression of transmission delay rather than omission of the IP packet P.

  Further, in the FTP application A2, as communication quality, it is required to ensure throughput and prevent loss of transmitted data (IP packet P). That is, in an application such as file transfer, the loss of the IP packet P causes data retransmission in the upper layer and the throughput decreases. For this reason, for the FTP application A2, a MAC channel profile is set in consideration of securing throughput and preventing loss of IP packets P rather than suppressing transmission delay.

  The channel control unit 207 controls the MAC channels C21 to C23 constituting the link layer channel set in the link layer channel processing unit 203. Specifically, the channel control unit 207 controls transmission / reception of data in the MAC channel based on the profile of the MAC channel determined by the profile determination unit 205.

  More specifically, the channel control unit 207 controls transmission / reception of data on the MAC channel by designating a management parameter for changing the profile of the MAC channel via the link access control (LAC) layer.

  In the present embodiment, the channel control unit 207 controls transmission / reception of the data in the MAC channel C23 (see FIG. 3) constituting the link layer channel C12 through which data transmitted / received by the VoIP application A1 is relayed. Similarly, the channel control unit 207 controls transmission / reception of the data in the MAC channels C21 and C22 (see FIG. 3) constituting the link layer channel C11 through which the data transmitted / received by the FTP application A2 is relayed.

  As described above, the channel control unit 207 determines whether or not to execute ARQ based on the profile determined by the profile determination unit 205. In the case of the VoIP application A1 that is requesting suppression of transmission delay, the channel control unit 207 stops ARQ execution in the MAC channel C23 that forms the link layer channel C12 used by the VoIP application A1. On the other hand, in the case of the FTP application A2 that requests prevention of data (IP packet P) loss, the channel control unit 207 executes ARQ on the MAC channels C21 and C22 constituting the link layer channel C11 used by the FTP application A2. To do.

  Further, channel control section 207 determines whether or not to add sequence number SN to IP packet P based on the profile determined by profile determination section 205. In the case of the VoIP application A1 that does not execute the MAC channel aggregation, the channel control unit 207 stops adding the sequence number SN in the MAC channel C23.

  Further, the channel control unit 207 determines whether or not to execute the MAC channel aggregation based on the profile determined by the profile determination unit 205. In the case of the FTP application A2 that requests an increase in throughput, the channel control unit 207 executes MAC channel aggregation.

  As shown in FIG. 7, in this embodiment, a data rate (throughput) of 340 kbps can be realized for each MAC channel. That is, when three MAC channels (MAC channels C21 to C23) are used together, a total data rate of 1,020 kbps can be realized.

  The storage unit 209 stores the MAC channel control parameters shown in FIG.

  The wired LAN interface units 211A and 211B provide an interface compliant with a predetermined wired LAN system (Ethernet (registered trademark)). The wired LAN interface units 211A and 211B each have an RJ45 connector.

  The wired LAN interface unit 211A is connected to the PC 30. The wired LAN interface unit 211B is connected to the telephone terminal 40 (see FIG. 3).

(Operation of wireless terminal device)
Next, the operation of the wireless terminal device 200 will be described with reference to FIG. Specifically, an operation in which radio terminal apparatus 200 sets a MAC channel profile will be described.

  As shown in FIG. 5, in step S10, the radio terminal device 200 determines whether or not a link layer channel setting request has been received. Radio terminal apparatus 200 receives a link layer channel setting request from PC 30 or telephone terminal 40.

  When the link layer channel setting request is received (YES in step S10), in step S20, the wireless terminal device 200 confirms the wired LAN interface (wired LAN interface units 211A and 211B) that has received the link layer channel setting request. To do.

  In step S30, the wireless terminal device 200 acquires a MAC channel profile associated with the wired LAN interface that has received the link layer channel setting request. Specifically, the wireless terminal device 200 acquires a MAC channel profile based on the MAC channel control parameters shown in FIG.

  In step S40, the wireless terminal device 200 sets a link layer channel based on the acquired MAC channel profile.

  For example, when the wireless terminal device 200 receives a link layer channel setting request from the PC 30 via the wired LAN interface unit 211A (see FIG. 3), the wireless terminal device 200 selects “for PC” based on the MAC channel control parameter shown in FIG. Is selected.

  As a result, ARQ is executed in the MAC channel constituting the link layer channel through which data (IP packet P) transmitted and received by the PC 30 (FTP application A2) is relayed. In this case, if a plurality of MAC channels can be used, MAC channel aggregation using a maximum of three MAC channels (MAC channels C21 to C23) is executed. Further, in the MAC channel, a sequence number SN is added for each frame of the MAC layer.

(Action / Effect)
According to the wireless terminal device 200 described above, the MAC channel profile that affects the communication quality is determined based on the communication quality requested by the application (VoIP application A1, FTP application A2). In addition, transmission / reception of data in the MAC channels C21 to C23 is controlled based on the determined profile.

  In this embodiment, (a) suppression of transmission delay, (b) ensuring of throughput, and (c) prevention of data loss are set as communication quality. Also, the presence / absence of ARQ, the necessity of MAC channel aggregation execution, and the presence / absence of sequence number SN are determined as profiles.

  For this reason, when setting a link layer channel for every application, the profile of the MAC channel which comprises a link layer channel can be changed according to the communication quality which an application requests | requires. That is, according to the wireless terminal device 200, a link layer channel according to the communication quality requested by the application can be set.

  In the present embodiment, whether to add the sequence number SN in the MAC channel is determined based on the required communication quality. Since there is often a very small data payload between the radio base station 100 and the radio terminal device 200, that is, in the radio section, overhead due to stopping the addition of the sequence number SN composed of several bits to several bytes The reduction effect is great. Therefore, it is possible to effectively increase the effective communication band of the link layer channel C12 used for “IP telephone” (see FIG. 6) to which the sequence number SN is not added (see FIG. 6), that is, the VoIP application A1.

(Other embodiments)
As described above, the content of the present invention has been disclosed through one embodiment of the present invention. However, it should not be understood that the description and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments will be apparent to those skilled in the art.

  For example, in the above-described embodiment, the communication system including the wireless base station 100 and the wireless terminal device 200 compliant with iBurst has been described as an example. However, the present invention can be applied to a digital wireless communication method other than iBurst. it can.

  In the above-described embodiment, (a) transmission delay suppression, (b) securing of throughput, and (c) data loss prevention are set as the communication quality required by the application. However, the present invention is not limited to this. The MAC channel profile is not limited to the content shown in FIG. For example, in order to ensure throughput while suppressing transmission delay, ARQ may be set to “none” and a profile for executing MAC channel aggregation may be defined.

  As described above, the present invention naturally includes various embodiments that are not described herein. Therefore, the technical scope of the present invention is defined only by the invention specifying matters according to the scope of claims reasonable from the above description.

1 is an overall schematic configuration diagram of a communication system according to an embodiment of the present invention. It is a figure which shows the protocol stack of the apparatus which comprises the communication system which concerns on embodiment of this invention. It is a figure which shows the structural example of the link layer channel (logical channel) set in the communication system which concerns on embodiment of this invention. It is a functional block block diagram of the radio | wireless terminal apparatus which concerns on embodiment of this invention. It is an operation | movement flowchart of the radio | wireless terminal apparatus which concerns on embodiment of this invention. It is a figure which shows an example of the profile of the MAC channel which concerns on embodiment of this invention. It is a figure which shows the data rate of the MAC channel which concerns on embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Internet, 20 ... PDSN, 30 ... PC, 40 ... Telephone terminal, 50 ... SIP server, 60 ... Telephone terminal, 70 ... FTP server, 100 ... Wireless base station, 200 ... Wireless terminal device, 201 ... Wireless communication part, 203 ... Link layer channel processing unit, 205 ... Profile determination unit, 207 ... Channel control unit, 209 ... Storage unit, 211A, 211B ... Wired LAN interface unit, A1 ... VoIP application, A2 ... FTP application, C11, C12 ... Link layer Channel, C21 to C23 ... MAC channel, SN ... Sequence number, P ... IP packet

Claims (14)

A logical channel setting unit configured to set, for each application, a logical channel that is configured by a MAC channel that is a communication channel at a MAC layer level set with a wireless base station and is used for relaying data transmitted and received by an application;
A profile determination unit that determines a profile of the MAC channel that affects the communication quality based on the communication quality required by the application;
A wireless terminal apparatus comprising: a channel control unit that controls transmission and reception of the data in the MAC channel based on the profile determined by the profile determination unit. In the MAC channel, automatic retransmission control of the data is used,
The radio terminal apparatus according to claim 1, wherein the channel control unit determines whether to perform the automatic retransmission control based on the profile determined by the profile determination unit.   3. The channel control unit according to claim 2, wherein, when the application requests suppression of transmission delay, the channel control unit stops execution of the automatic retransmission control in the MAC channel configuring the logical channel used by the application. Wireless terminal device. The logical channel setting unit can execute MAC channel aggregation for setting the logical channel using a plurality of the MAC channels collectively,
The radio terminal apparatus according to claim 1, wherein the channel control unit determines whether to perform the MAC channel aggregation based on the profile determined by the profile determination unit.   The wireless terminal apparatus according to claim 4, wherein the channel control unit performs the MAC channel aggregation when the application requests an increase in throughput. The packet transmitted using the logical channel is added with order information capable of determining the transmission order of the packet,
The radio terminal apparatus according to claim 1, wherein the channel control unit determines whether or not to add the order information to the packet based on the profile determined by the profile determination unit.   When the channel control unit does not execute the MAC channel aggregation for setting the logical channel by using a plurality of the MAC channels, the order information in the MAC channel constituting the logical channel used by the application The wireless terminal device according to claim 6, wherein the addition of is canceled. A logical channel configured by a MAC channel, which is a MAC layer level communication channel set with a wireless base station, and used for relaying data transmitted and received by an application, for each application;
Determining a profile of the MAC channel that affects the communication quality based on the communication quality required by the application;
A channel control method comprising: controlling transmission / reception of the data in the MAC channel based on the determined profile. In the MAC channel, automatic retransmission control of the data is used,
The channel control method according to claim 8, wherein in the controlling step, it is determined whether to perform the automatic retransmission control based on the determined profile.   The said control step WHEREIN: When the said application requests | requires suppression of transmission delay, execution of the said automatic retransmission control is stopped in the said MAC channel which comprises the said logical channel used by the said application. Channel control method. In the step of setting the logical channel, a MAC channel aggregation for setting the logical channel using a plurality of the MAC channels can be performed collectively.
The channel control method according to claim 8, wherein in the controlling step, it is determined whether to perform the MAC channel aggregation based on the determined profile.   12. The channel control method according to claim 11, wherein, in the controlling step, the MAC channel aggregation is executed when the application requests an increase in throughput. The packet transmitted using the logical channel is added with order information capable of determining the transmission order of the packet,
9. The channel control method according to claim 8, wherein in the controlling step, it is determined whether to add the order information to the packet based on the determined profile.   In the controlling step, when the MAC channel aggregation for setting the logical channel is not performed by using a plurality of the MAC channels collectively, the order information in the MAC channel constituting the logical channel used by the application The channel control method according to claim 13, wherein the addition of is stopped.

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