JP2003061128A - Dynamic delay ack controller in mobile terminal and dynamic delay ack control method in the mobile terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dynamic delay ACK controller that can eliminate a reply of a duplicate ACK caused by inversion of packet receiving sequence on the occurrence of temporary duplicate path when a path optimizing function of a Mobile IP is applied on the occurrence of hand-over thereby avoiding re-transmission of useless packets from a server and enhancing the entire communication throughput. SOLUTION: When a processing section 24 detects occurrence of hand-over at movement between base stations, a setting section 26 sets a flag 38 denoting a dynamic delay ACK reply period for a predetermined period from the occurrence of the hand-over, an inspection section 30 inspects whether or not the flag 38 is set at reception of a packet form a base station device, and a control means comprising processing sections 34, 28, 36 applies dynamic delay ACK control to the mobile terminal to delay the ACK response with respect to the packet received from the base station device when the setting of the flag 38 is confirmed by the inspection.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to Mobile I
In a mobile communication network to which a route optimization function of the P (Internet Protocol) protocol (described later) is applied, when a mobile terminal device performs a handover when moving between base station devices, a proper communication state is set. The present invention relates to a dynamic delay ACK control device in a mobile terminal device that performs control for holding and a dynamic delay ACK control method in a mobile terminal device.

[0002]

2. Description of the Related Art The Mobile IP protocol is
R at ETF (Internet Engineering Task Force)
It is standardized as FC (Request for Comments) 2002. According to this Mobile IP protocol technology, no matter where on the Internet the mobile terminal device is connected, from another mobile terminal device, the home address of the mobile terminal device (the permanent address assigned to the mobile terminal device). By transmitting the packet to the IP (Internet Protocol) address}, the packet is transmitted to the destination of the mobile terminal device.

In the mobile communication network for controlling the location management of the mobile terminal device by the Mobile IP protocol, the packet transferred from the server on the transmitting side to the mobile terminal device via the base station device is always the home agent ( HA). HA is a router that stores current location information for mobile terminal devices.

Since it goes through the HA, the route becomes redundant,
This will put a load on the HA. For this reason, the server caches the destination address (holds it in the high-speed storage device),
It is effective to perform route optimization by tunneling, that is, by embedding a multicast packet in a unicast packet for encapsulation and directly transferring this packet to the communication terminal device of the moving destination.

However, for security reasons, the binding update message for notifying the server of the destination address is transferred from the HA to the server after the HA receives the registration request from the mobile terminal device. In this case, a delay occurs until the data is transferred to a new destination address by the cache, and the data is transferred to the address before the transfer during that time, which causes a packet loss due to a packet routing error.

To solve this, Mobile I
As a route optimization function of P, there is a function of notifying the pre-migration FA of the migration destination address from the migration foreign agent (FA). FA is a mobile node (mobile terminal device)
Is a router on the network visited by the mobile node for providing a route service to the mobile node while being registered.

With the route optimization function, the packet transmitted to the pre-movement address due to the update delay of the binding cache is retunneled from the pre-movement FA to the movement destination FA and is delivered to the movement destination.

[0008]

In the above conventional mobile communication network, TCP (Transmission Control Protocol) is used by using the route optimization function of Mobile IP.
ol) communication, when the mobile terminal device switches FAs by the base station device handover, the all FA notification function causes the server (transmission node) → pre-movement FA → destination FA → mobile terminal device (movement) Node) and a server → destination FA → mobile terminal device temporarily generate two types of communication paths.

Therefore, the TC that follows the latter shorter path
A P-packet overtakes the TCP packet on the former route and arrives at the mobile terminal device first, which causes a phenomenon of reversal of the reception order of the sequence number of the TCP packet. That is, in the mobile terminal device, a phenomenon occurs in which the packet reception order is reversed.

At this time, in the mobile terminal device, when the TCP function receives the TCP packet directly transferred to the destination FA on the latter route, the T function is still retransmitting from the pre-movement FA.
Interpret the CP packet as lost, and duplicate ACK (Ack
Reply (send) now knowledge) to the server. When the server receives 3 packets of the duplicate ACK, the server retransmits the packet which seems to be lost due to the high-speed retransmission algorithm.

By the TCP congestion control caused by this sequence inversion phenomenon, the congestion window size is reduced and the transfer amount is reduced. This reduces the throughput of the entire communication.

[0012] Therefore, the present invention uses Mo at the time of handover.
It is possible to eliminate duplicate ACK responses due to packet reception order inversion when a temporary route duplication occurs when the route optimization function of the bile IP is applied, thereby eliminating unnecessary packet retransmission at the server. An object of the present invention is to provide a dynamic delay ACK control device in a mobile terminal device and a dynamic delay ACK control method in a mobile terminal device, which can improve the throughput of the entire communication.

[0013]

In order to solve the above problems, a dynamic delay ACK control device in a mobile terminal device of the present invention is a mobile terminal of a mobile communication network to which a route optimization function of a communication protocol is applied. In the dynamic delay ACK control device in the device, a detection means for detecting the occurrence of a handover when moving between base station devices, and, when detecting the occurrence of the handover, an operation for a predetermined period from the occurrence of the handover. Setting means for setting a first flag indicating a statically delayed ACK response period, checking means for checking whether or not the first flag is set when a packet is received from the base station device, and the checking means. When the setting of the first flag is confirmed by, the ACK response of the packet received from the base station device is delayed for a certain period. It is characterized in that a control means for performing dynamic delayed ACK control.

When the route control of the packet transfer to the mobile terminal device is performed using the binding cache of the route optimization function in the communication protocol (Mobile IP protocol), the route is temporarily duplicated by the handover. Therefore, the order of the sequence numbers of the packets received by the mobile terminal device is reversed. Therefore, it is expected that order inversion will occur for a certain period after the occurrence of handover, so a dynamic delay ACK response period (first flag setting period), which is a period in which specific processing is performed for an ACK response, is set. . Even if the sequence numbers are reversed in order at the time of this setting, the packet with the duplicated sequence number (the packet in which the ACK response is inserted) will not be transmitted to the server via the base station apparatus due to the dynamic delay ACK control.

Further, in the dynamic delay ACK control device in the mobile terminal device of the present invention, the control means is activated when the first flag is set, and counts a time for releasing the first flag. It is preferable to include a first timer and a second timer which is activated when the first flag is set and which measures the time of the transmission timing of the ACK response in the dynamic delay ACK control. is there.

Dynamic delay ACK control can be performed by maintaining the setting of the first flag by the first timer during the period in which the order inversion occurs after the occurrence of handover,
At the time of the control, the ACK response can be transmitted at the transmission timing in which the sequence numbers instructed by the timing operation of the second timer do not overlap.

Further, in the dynamic delay ACK control device in the mobile terminal device of the present invention, the setting means is configured to transmit the base station when the setting of the first flag is confirmed by the first checking means. When a packet is received from the device, it is preferable to set a second flag indicating that all the packets having a sequence number smaller than the sequence number to be received next are received.

During the dynamic delay ACK response period (first flag setting period), if the second flag is set, all packets having a sequence number smaller than the sequence number to be received next should be received. Can be recognized, the immediate ACK response can be transmitted after the second timer times out.

In order to solve the above-mentioned problems, a dynamic delay ACK control device in a mobile terminal device of the present invention is a dynamic delay ACK in a mobile terminal device of a mobile communication network to which a route optimization function of a communication protocol is applied. In the control device, a detecting means for detecting the occurrence of a handover when moving between base station devices, and at the time of detecting the occurrence of the handover, a dynamic delay ACK response period of a predetermined constant period from the occurrence of the handover. First to show that there is
Setting means for setting the first flag, first checking means for checking whether the first flag is set when a packet is received from the base station device, and the first checking means for setting the first flag. When the setting of the flag is confirmed, if the received sequence number, which is the number of the packet received from the base station device, is not the sequence number to be originally received, the packet with the duplicated sequence number is transmitted to the base station device. In order to refrain from this, it is characterized by further comprising setting means for performing dynamic delay ACK control for delaying the ACK response of the received packet for a certain period.

During the dynamic delay ACK response period (first flag setting period), if the sequence number of the packet received from the base station device does not match the sequence number to be originally received, the order may be reversed. Can be detected. At this time, the delayed ACK response period starts,
The dynamic delay ACK control allows the ACK response to be transmitted at the transmission timing where the sequence numbers do not overlap.

Further, in the dynamic delay ACK control device in the mobile terminal device of the present invention, the control means is a second checking means for checking whether the received sequence number and the sequence number to be originally received match or not. And the second
Second setting means for setting a second flag indicating that it is the execution period of the dynamic delay ACK control when the inspection result of the inspection means of No. 1 and the first flag are set. A first timer for measuring the time for releasing the first flag, and a time for starting the second flag for setting the second flag, and measuring the time for releasing the second flag, and the dynamic delay ACK control. It is preferable that the second timer is provided to measure the time of the transmission timing of the ACK response.

In the dynamic delayed ACK response period, if the first flag is set but the second flag is not set, it can be confirmed that the order inversion has not occurred yet. Therefore, the transmission process of the immediate ACK response can be performed when the packet is received. On the other hand, when the order inversion occurs after the occurrence of the handover, the dynamic delay ACK control can be performed by maintaining the setting of the second flag by the second timer,
During the control, the ACK response can be transmitted at the transmission timing instructed by the timing operation of the second timer.

Further, in the dynamic delay ACK control device in the mobile terminal device of the present invention, the second checking means updates the maximum reception sequence number in accordance with the reception sequence number when the first flag is set. However, after updating the sequence number to be received next time when the reception sequence number and the sequence number to be originally received match, the sequence number to be received next and the value of the maximum reception sequence number + 1 match. In this case, it is preferable that the first and second timers are stopped and the second flag is cleared.

When the reception sequence number is larger than the maximum reception sequence number, the maximum reception sequence number is updated (changed) to the reception sequence number. If it is small, it is left as it is. After that, if the sequence number to be received matches the value of the maximum reception sequence number + 1, it is not necessary to perform the dynamic delay ACK control, so the second and second timers are stopped and the second flag is set. To release. As a result, the dynamic delay ACK control ends, and normal ACK response processing is performed.

In addition, in the dynamic delay ACK control device in the mobile terminal device of the present invention, the second setting means, when the setting of the second flag is confirmed by the second checking means, It is preferable that the third flag is set when a packet is received from the base station device.

In the delayed ACK response period, if the third flag is set, it can be recognized that all packets having a sequence number smaller than the sequence number to be received next are recognized, so that the second timer The transmission process of the immediate ACK response can be performed after the time-out.

In order to solve the above-mentioned problems, a dynamic delay ACK control method in a mobile terminal device according to the present invention is a dynamic delay ACK in a mobile terminal device of a mobile communication network to which a route optimization function of a communication protocol is applied. In the control method, a detection step of detecting the occurrence of a handover when moving between base station devices, and a dynamic delay of a predetermined period from the occurrence of the handover when the occurrence of the handover in the detection step is detected. ACK
A setting step of setting a first flag indicating a response period, an inspection step of inspecting whether or not the first flag is set when a packet is received from the base station device, and an inspection in the inspection step When the setting of the first flag is confirmed by, the control step of performing dynamic delay ACK control for delaying the ACK response of the packet received from the base station device for a certain period is provided.

When the route control of the packet transfer to the mobile terminal device is performed using the binding cache of the route optimization function in the communication protocol (Mobile IP protocol), the route is temporarily duplicated by the handover. Therefore, the order of the sequence numbers of the packets received by the mobile terminal device is reversed. Therefore, it is expected that order inversion will occur for a certain period after the occurrence of handover, so a dynamic delay ACK response period (first flag setting period), which is a period in which specific processing is performed for an ACK response, is set. . Even if the sequence numbers are reversed in order at the time of this setting, the packet with the duplicated sequence number (the packet in which the ACK response is inserted) will not be transmitted to the server via the base station apparatus due to the dynamic delay ACK control.

Further, in the dynamic delay ACK control method in the mobile terminal device of the present invention, the control step includes
A first timing step which is started when the first flag is set and measures the time for releasing the first flag; and an ACK response in the dynamic delay ACK control which is started when the first flag is set. And a second timing step for timing the time of the transmission timing of 1.

Dynamic delay ACK control can be performed by maintaining the setting of the first flag in the first timing step during the period in which the order reversal occurs after the occurrence of the handover, and the second delay ACK control can be performed during the control. The ACK response can be transmitted at a transmission timing in which the sequence numbers instructed by the timing operation of the timing step do not overlap.

Further, in the dynamic delay ACK control method in the mobile terminal device of the present invention, the setting step is
When a packet is received from the base station device when the setting of the first flag is confirmed by the first check step, all packets having a sequence number smaller than the sequence number to be received next are received. It is preferable to set a second flag that indicates that

During the dynamic delay ACK response period (first flag setting period), if the second flag is set, all packets having a sequence number smaller than the sequence number to be received next should be received. Can be recognized, so an immediate ACK is issued after the second timing step times out.
A process of transmitting a response can be performed.

In order to solve the above problems, a dynamic delay ACK control method in a mobile terminal device of the present invention is a dynamic delay ACK in a mobile terminal device of a mobile communication network to which a route optimization function of a communication protocol is applied. In the control method, a detection step of detecting the occurrence of a handover when moving between base station devices, and a dynamic delay of a predetermined period from the occurrence of the handover when the occurrence of the handover in the detection step is detected. ACK
A setting step of setting a first flag indicating a response period; a first checking step of checking whether or not the first flag is set when a packet is received from the base station apparatus; When the setting of the first flag is confirmed by the inspection step 1), if the received sequence number, which is the number of the packet received from the base station device, is not the sequence number to be originally received, a duplicated sequence number In order to refrain from transmitting a packet to the base station apparatus, a setting step of performing dynamic delay ACK control for delaying the ACK response of the received packet for a certain period is provided.

During the dynamic delay ACK response period (first flag setting period), if the sequence number of the packet received from the base station device does not match the sequence number to be originally received, there is a possibility of order inversion. Can be detected. At this time, the delayed ACK response period starts,
The dynamic delay ACK control allows the ACK response to be transmitted at the transmission timing where the sequence numbers do not overlap.

Further, in the dynamic delay ACK control method in the mobile terminal device of the present invention, the control step includes:
A second inspection step for inspecting the match / mismatch between the received sequence number and the sequence number to be originally received,
A second setting step of setting a second flag indicating the execution period of the dynamic delay ACK control when the inspection results of the second inspection step do not match, and the setting of the first flag A first time counting step that is activated at a time to measure the time to release the first flag, and a time to activate the second flag to set the second flag and measure the time to release the second flag. It is preferable that the method further comprises a second timing step of timing the time of the transmission timing of the ACK response in the statically delayed ACK control.

In the dynamic delayed ACK response period, if the first flag is set but the second flag is not set, it can be confirmed that the order inversion has not occurred yet. Therefore, the transmission process of the immediate ACK response can be performed when the packet is received. On the other hand, when the order inversion occurs after the occurrence of the handover, the dynamic delay ACK control can be performed by maintaining the setting of the second flag in the second timing step. The ACK response can be transmitted at the transmission timing instructed by the timing operation of the timing step.

Further, in the dynamic delay ACK control method in the mobile terminal device of the present invention, the second checking step updates the maximum reception sequence number in accordance with the reception sequence number when the first flag is set. Then, after updating the sequence number to be received next time when the above received sequence number matches the sequence number to be originally received,
When the sequence number to be received next and the value of the maximum reception sequence number + 1 match, the first and second timing steps are stopped and the second flag is released. Is preferred.

When the reception sequence number is larger than the maximum reception sequence number, the maximum reception sequence number is updated (changed) to the reception sequence number. If it is small, it is left as it is. After that, if the sequence number to be received matches the value of the maximum reception sequence number + 1, it is not necessary to perform the dynamic delay ACK control, so the second and third timing steps are stopped and the second flag is set. To cancel. As a result, the dynamic delay ACK control ends, and normal ACK response processing is performed.

Also, in the dynamic delay ACK control method in the mobile terminal device of the present invention, the second setting step may be performed when the setting of the second flag is confirmed by the second checking step. It is preferable that the third flag is set when a packet is received from the base station device.

In the delayed ACK response period, if the third flag is set, it can be recognized that all packets having a sequence number smaller than the sequence number to be received next are recognized. The transmission process of the immediate ACK response can be performed after the timeout of

[0041]

BEST MODE FOR CARRYING OUT THE INVENTION A dynamic delay ACK control device in a mobile terminal device according to an embodiment of the present invention will be described with reference to the drawings.

First, the configuration of the dynamic delay ACK control device in the mobile terminal device according to the first embodiment will be described. FIG. 1 is a configuration diagram of a dynamic delay ACK control device in a mobile terminal device according to the first embodiment.

The dynamic delay ACK control device 10a in the mobile terminal device according to the present embodiment, as shown in FIG.
Wireless data ring processing unit 12 and wireless link control unit 14
And a transport protocol processing unit 16 and a network protocol processing unit 18.

The wireless data link processing unit 12 is composed of a wireless link data processing unit 20 and a BS list unit 22.

The radio link control section 14 includes a link state inspection processing section (detection means) 24, a dynamic delay ACK response period flag setting section (setting means) 26, and a timer processing section (first timer) 28. It is equipped with.

The transport protocol processing section 16 is
Delayed ACK flag inspection unit (inspection unit) 30, TCP packet reception processing unit 32, ACK transmission processing unit 34, timer processing unit (second timer) 36, dynamic delayed ACK response period flag 38, and delay And an ACK flag 40.

The network protocol processing unit 18 uses the I
The P protocol processing unit 42 is provided.

The wireless link data processing unit 20 is connected to the physical layer 60 that performs data communication processing for a wireless communication line (wireless link). In the first embodiment, the ACK transmission processing unit 34 and the timer processing units 28 and 36 constitute the control means.
Hereinafter, each component will be described in detail.

The BS list unit 22 receives the information contained in the beacon signal from the base station apparatus (BS) (not shown) received by the mobile terminal apparatus via the physical layer 60 as the base station apparatus ID (Ide).
ntifier) and saved.

The wireless link data processing unit 20 is
The data packet from S is received via the physical layer 60, and the data of the ACK response from the IP protocol processing unit 42 is transmitted to the BS via the physical layer 60.

The IP protocol processing unit 42 processes the packet from the wireless link data processing unit 20 and the data of the ACK response from the ACK transmission processing unit 34 such as addressing and routing which are IP protocol processes defined in advance. I do.

The link state inspection processing unit 24 periodically monitors the BS list unit 22 and, when detecting the occurrence of the base station device handover, notifies the dynamic delay ACK response period flag setting unit 26 of this.

Dynamic delay ACK response period flag setting unit 26
Upon receiving the notification of the occurrence of the handover, the mobile station starts the dynamic delay ACK response period, which is a period for performing a specific process regarding the ACK response, from the occurrence of the handover. Delay AC
The K response period flag 38 is set to "1".

Further, the dynamic delay ACK response period flag setting section 26 has a timer for canceling the dynamic delay ACK response period flag 38 (set to "0") after a specific time c seconds corresponding to the fixed period. The timer processing unit 28 is set. By this setting, the dynamic delay ACK response period flag 38 is released after the specific time c seconds. However, in consideration of the delay time of the wireless section and the delay time due to the detour route of the packet, the specific period c should include a time period in which the packet reception order may be temporarily reversed due to the route duplication at the time of handover. It is determined.

Further, the dynamic delay ACK response period flag setting unit 26 requests the timer processing unit 36 to perform a time-out process. This time-out process has a delay A at regular intervals.
The CK flag 40 is inspected. If the delayed ACK flag 40 is “0”, nothing is done, and if the delayed ACK flag 40 is “1”, the ACK transmission processing unit 34 is requested to perform ACK transmission processing. Further, after a specific time c corresponding to the certain period, the timer processing unit 36 is requested to end the time-out process.

Upon receiving the TCP packet reception notification from the TCP packet reception processing unit 32, the delayed ACK inspection unit 30 determines whether or not it is the dynamic delay ACK response period by the dynamic delay A.
Determined by examining CK response period flag 38. As a result, if the dynamic delay ACK response period flag 38 is not "0", that is, the dynamic delay ACK response period, A
The CK transmission processing unit 34 is requested to perform normal ACK response processing. If the dynamic delay ACK response period flag 38 is the dynamic delay ACK response period of "1", the delay ACK flag 40 is set to "1" and the normal ACK response process is not requested at this time.

Next, the operation of the dynamic delay ACK control device 10a in the mobile terminal device according to the first embodiment will be described, and also the dynamic delay ACK control method according to the embodiment of the present invention will be described. FIG. 2 is a diagram showing a procedure of performing a process of dynamic delay ACK control in the dynamic delay ACK control device 10a in the mobile terminal device according to the present embodiment.

In step S1 shown in FIG. 2, when the mobile terminal receives the TCP packet from the BS,
In step S2, the delayed ACK flag checking unit 30 checks whether the dynamic delayed ACK response period flag 38 is set to "1".

Here, the dynamic delay ACK response period flag 3
The wireless link status inspection process for setting 8 is shown in FIG.
Will be described with reference to. FIG. 3 is a diagram showing a procedure of performing a wireless link state inspection process in the dynamic delay ACK control device 10a in the mobile terminal device according to the present embodiment.

In step 21 shown in FIG. 3, when the BS list unit 22 is monitored by the link state inspection processing unit 24 and the occurrence of the base station device handover is detected thereby, the occurrence of the handover is dynamically delayed. A
The CK response period flag setting unit 26 is notified. The dynamic delay ACK response period flag setting unit 26 that has received this notification
Thus, in step S22, the dynamic delay ACK response period flag 38 is set to "1", and the timer for releasing the dynamic delay ACK response period flag 38 (set to "0") after the specific time c seconds is a timer. It is set in the processing unit 28. By this setting, the dynamic delay ACK response period flag 38 is released after the specific time c seconds.

Further, in step S23, the timer processing section 36 sets a timer for periodically executing the delayed ACK transmission timer processing. At the same time, a timer that ends the delayed ACK transmission timer process after a specific time c seconds is set.

As a result of the check in step S2 of FIG. 2 above, if the dynamic delay ACK response period flag 38 is not set to "1", that is, if it is "0", no handover has occurred, so step S4. At, the delayed ACK flag checking unit 30 requests the ACK transmission processing unit 34 to perform a normal ACK response process.

Here, a normal ACK transmission process will be described with reference to FIG. FIG. 4 is a diagram showing a procedure for performing a normal ACK transmission process in the dynamic delay ACK control device 10a in the mobile terminal according to the present embodiment.

In step S31 shown in FIG. 4, AC
The K transmission processing unit 34 updates the sequence number to be received next. Next, in step S32, data is added to the socket buffer, and in step 33, immediately A
Set a flag (not shown) for responding CK, and
Call the CP output routine.

On the other hand, if the dynamic delay ACK response period flag 38 is set to "1" as a result of the check in step S2 of FIG. 2, the delay ACK flag 40 is set in step S3. After this process, the process returns to step S1.

Next, the timer processing in the dynamic delay ACK control shown in step S23 of FIG. 3 will be described with reference to FIG. FIG. 5 is a diagram showing a procedure for performing timer processing in the dynamic delay ACK control device 10a in the mobile terminal device according to the present embodiment.

In this timer processing, in step S41 shown in FIG. 5, the timer processing unit 36 delays ACK.
It is checked whether the flag 40 is set to "1". As a result, if it is set to "1", in step 42, the delayed ACK flag 40 is not set to "0".
Is changed to "1" in step S43, and the delay ACK counter (not shown) is incremented. Then, in step S44, the ACK transmission processing unit 34 performs TCP output processing. To be executed.

Then, in step S45, the timer processing unit 36 sets a timer for executing the timer processing of steps S41 to S44 after a specific time. If the delayed ACK flag 40 is not set to "0" in step S41, the process of step S45 is immediately executed.

Next, the operation and effect of the dynamic delay ACK control device in the mobile terminal device according to the first embodiment will be described. In the dynamic delay ACK control device 10a, the link state inspection processing unit 24 detects the occurrence of handover when moving between base station devices, and the dynamic delay ACK
When the response period flag setting unit 26 detects the occurrence of a handover, it sets a dynamic delay ACK response period flag 38 that indicates a dynamic delay ACK response period of a predetermined period from the occurrence of the handover, The delay ACK flag checking unit 30 checks whether or not the dynamic delay ACK response period flag 38 is set at the time of receiving a packet from the base station device, and further, in the control means by the ACK transmission processing unit 34 and the timer processing units 28 and 36. , A of the packet received from the base station apparatus when the setting of the dynamic delay ACK response period flag 38 is confirmed by the above inspection.
Dynamic delay ACK control for delaying the CK response for a certain period is performed.

Therefore, the communication protocol (Mobile
When the route control of the packet transfer to the mobile terminal device is performed using the binding cache of the route optimization function in the IP protocol), the route is temporarily duplicated by the handover. Therefore, the order of the sequence numbers of the packets received by the mobile terminal device is reversed. Therefore, it is expected that the order inversion will occur for a certain period after the occurrence of the handover, so the dynamic delay ACK response period (first
Flag setting period). Even if the sequence numbers are reversed in order at the time of this setting, the packet with the duplicated sequence number (the packet in which the ACK response is inserted) will not be transmitted to the server via the base station apparatus due to the dynamic delay ACK control.

Further, the timer processing section 28, which is a constituent element of the above control means, has the dynamic delay ACK response period flag 38.
And the dynamic delay ACK response period flag 38
The timer processing unit 36 is activated when the dynamic delay ACK response period flag 38 is set, and measures the time of the transmission timing of the ACK response in the dynamic delay ACK control.

Therefore, during the period in which the order inversion occurs after the occurrence of the handover, the timer processing unit 28 causes the dynamic delay ACK.
Dynamic delay ACK control can be performed by maintaining the setting of the response period flag 38, and at the time of the control, the ACK response is transmitted at a transmission timing at which the sequence numbers instructed by the timing operation of the timer processing unit 36 do not overlap. You can

Further, in the setting means, the dynamic ACK response period flag 38 is set by the delay ACK flag checking section 30.
When the packet is received from the base station device when the setting of 1 is confirmed, the delayed ACK flag 40 indicating that all the packets having the sequence number smaller than the sequence number to be received next are received is set.

Therefore, in the dynamic delay ACK response period, if the delay ACK flag 40 is set, it can be recognized that all the packets having the sequence number smaller than the sequence number to be received next are recognized, so that the timer is used. The transmission process of the immediate ACK response can be performed after the processing unit 36 times out.

Next, the configuration of the dynamic delay ACK control device in the mobile terminal device according to the second embodiment will be described. FIG. 6 is a block diagram of a dynamic delay ACK control device in the mobile terminal device according to the second embodiment. However, in the second embodiment shown in FIG. 6, parts corresponding to the respective parts of the first embodiment of FIG. 1 are designated by the same reference numerals.

The dynamic delayed ACK control device 10b in the mobile terminal device according to the present embodiment does not enter the delayed ACK response period immediately after the handover, but enters the delayed ACK response period only after detecting the occurrence of packet reordering. It is provided with a function for ending the delayed ACK response period when the order inversion is completed.

As shown in FIG. 6, the dynamic delay ACK control device 10b includes a wireless data ring processing unit 12, a wireless link control unit 14, a transport protocol processing unit 16, and a network protocol processing unit 18. It is equipped with.

The transport protocol processing section 16 is
A delayed ACK flag inspection unit (first inspection means) 30;
CP packet reception processing unit 32 and ACK transmission processing unit 34
And the dynamic delay ACK response period flag (first flag) 3
8 and delayed ACK response period flag (second flag) 39
A delayed ACK flag (third flag) 43, a reception sequence number inspection section (second inspection means) 44, a delay A
The CK response period flag setting unit 46 and the timer processing unit (second
Timer) 48).

The wireless data ring processing unit 12, the wireless link control unit 14, the transport protocol processing unit 16, and the network protocol processing unit 18 are the same as the dynamic delay ACK control device 10a shown in FIG. It is composed of elements. Incidentally, in the second embodiment,
The timer processing units 28 and 36, the reception sequence number inspection unit 44, and the delayed ACK response period flag setting unit 46 constitute control means. Hereinafter, the characteristic components of the second embodiment will be described in detail.

Upon receiving the TCP packet reception notification from the TCP packet reception processing unit 32, the delayed ACK inspection unit 30 determines whether or not it is the dynamic delayed ACK response period by the dynamic delay A.
Determined by examining CK response period flag 38. As a result, if the dynamic delay ACK response period flag 38 is not "0", that is, the dynamic delay ACK response period, A
The CK transmission processing unit 34 is requested to perform normal ACK response processing. If the dynamic delay ACK response period flag 38 is the dynamic delay ACK response period of “1”, the delay ACK response period flag 39 is checked. This delayed ACK response period flag 39
Is 0, the reception sequence number inspection unit 44 is requested to perform a reception sequence number inspection process.

The reception sequence number checking unit 44 compares the reception sequence number with the sequence number to be received next (a number obtained by adding 1 to the sequence number that has been continuously received so far), and as a result, they match. If not, the delayed ACK response period flag setting unit 46 is requested to perform the delayed ACK response period start processing, and if they match, the ACK transmission processing unit 34 is requested to perform normal ACK transmission processing.

Further, the reception sequence number inspection unit 44 is
If the received sequence number and the sequence number to be received next match, the sequence number to be received next is
Update to the value of the reception sequence number + 1. Further, the reception sequence number is compared with the maximum reception sequence number, and if the reception sequence number is larger than the maximum reception sequence number, the maximum reception sequence number is updated to the reception sequence number. Further, the sequence number to be received next and the maximum reception sequence number + 1 are compared, and if they match, as a result, the delayed ACK response period flag setting unit 46 is requested to perform the delayed ACK response period end processing, and they match. If not, "1" is set in the delayed ACK flag 43.

The delayed ACK response period flag setting section 46
When a request for delayed ACK response period start processing is received, delay A
The CK response period flag 39 is set to "1", the timer processing unit 48 is requested to start the time-out process for checking the delayed ACK flag 43, and the delayed ACK
The flag 43 is set to "1", and the process ends.

The delayed ACK response period flag setting unit 4
6 receives the request for the delayed ACK response period end processing,
The delayed ACK response period flag 39 is set to “0”, the timer processing unit 48 is requested to end the time-out processing for checking the delayed ACK flag 43, and further, the delayed ACK flag 43 is checked, and this delay ACK flag 4
If 3 is "0", the ACK transmission processing unit 34 is not subjected to ACK transmission processing, and if the delayed ACK flag 43 is "1", ACK transmission processing is requested.

Upon receiving the delayed ACK response period start request from the delayed ACK response period flag setting unit 46, the timer processing unit 48 inspects the delayed ACK flag 43 at regular intervals,
If the result is "0", the timer process is terminated, and if the result is "1", the ACK transmission processing unit 34 is requested to perform the ACK transmission process. When the delayed ACK response period flag setting unit 46 receives the delayed ACK response period end request, the inspection process of the delayed ACK flag 43 ends.

Next, the dynamic delay A according to the second embodiment.
The operation when the delayed ACK control is not executed immediately after the handover in the CK control device 10b will be described, and at the same time, the dynamic delayed ACK according to the embodiment of the present invention will be described.
The control method will be described. FIG. 7 shows a dynamic delay ACK control device 10 in the mobile terminal device according to the second embodiment.
FIG. 13 is a diagram showing a procedure for performing a process of dynamic delayed ACK control when the delayed ACK control is not executed immediately after the handover in b.

In step S51 shown in FIG. 7,
When the mobile terminal device receives the TCP packet from the BS, the delayed ACK flag checking unit 30 checks in step S52 whether the dynamic delayed ACK response period flag 38 is set to "1".

As a result of this inspection, if the dynamic delay ACK response period flag 38 is not set to "1", that is, "0".
If so, the handover has not occurred, so in step S60, the delayed ACK flag inspection unit 30 outputs AC
The K transmission processing unit 34 is requested to perform a normal ACK transmission process.

On the other hand, as a result of the check in step S52, if the dynamic delay ACK response period flag 38 is set to "1", it means that the dynamic delay ACK response period at the time of handover occurs, so in step S53. , Delayed ACK
It is checked whether the response period flag 39 is set. As a result of this inspection, if the delayed ACK response period flag 39 is not set to "1", that is, if it is "0", the sequence inversion has not occurred until the previous time. Therefore, the delayed ACK flag inspection unit 30 determines the reception sequence number. The inspection unit 44 is requested to inspect the received sequence number.

According to this request, in step S58, the reception sequence number checking unit 44 determines whether the reception sequence number matches the sequence number to be received next. If the result of this determination is that they do not match,
In step S59, the delayed ACK response period start processing is requested to the delayed ACK response period flag setting unit 46.

The dynamic delay ACK response period start processing will be described with reference to FIG. FIG. 8 shows a dynamic delay ACK control device 10 in the mobile terminal device according to the present embodiment.
FIG. 11 is a diagram showing a procedure for performing delayed ACK response period start processing in b.

In step S61 shown in FIG. 8, the delayed ACK response period flag setting unit 46 sets the delayed ACK response period flag 39 to "1". Next, step S62.
In the above, the delayed ACK response period flag setting unit 46 requests the timer processing unit 48 to set a timer for periodically executing the delayed ACK transmission timer process. Finally, in step S63, the delayed ACK response period flag setting unit 4
6 sets the delayed ACK flag 43 to "1" and returns to the process of step S51 of FIG.

On the other hand, as a result of the check in step S58, if the received sequence number matches the sequence number to be received next, the sequence number sequence inversion has occurred up to the previous time even during the dynamic delay ACK period. No, it means that it has not occurred this time, so step S6
At 0, normal ACK transmission processing is performed.

Also, the inspection result of step S53, delay A
If the CK response period flag 39 is set to "1",
The delayed ACK flag checking unit 30 requests the receiving sequence number checking unit 44 to perform a receiving sequence number checking process. In response to this request, in step S54, the reception sequence number inspection unit 44 compares the reception sequence number of the received TCP packet with the sequence number to be received next, which is held in advance, and if they match, the reception sequence number should be received next. The value obtained by adding 1 to the sequence number is updated as the sequence number to be received next. Further, the reception sequence number of the received TCP packet is compared with the maximum reception sequence number held in advance, and if the reception sequence number of the received TCP packet is larger, the reception sequence number of the received TCP packet is changed to the new maximum reception number. Update as a sequence number.

Then, in step S55, the sequence number to be received next and the maximum reception sequence number are set to 1
The added value is compared, and if they match, step S57.
At the reception sequence number check unit 44,
The K response period flag setting unit 46 is requested to perform the delayed ACK response period end process.

Dynamic delay AC in step S57
The delayed ACK response period end processing in K control will be described with reference to FIG. FIG. 9 is a diagram showing a procedure of performing a delayed ACK response period end process in the dynamic delayed ACK control device 10b in the mobile terminal device according to the present embodiment.

The delayed ACK response period flag setting section 46
In step S71, the delayed ACK response period flag 3
Set 9 to "0". Then, in step S72, the delayed ACK response period flag setting unit 46 requests the timer processing unit 48 to end the delayed ACK transmission timer process. Further, in step S73, the delay AC
The K response period flag setting unit 46 uses the delayed ACK flag 43.
Check if is set to "1". If the inspection result is set to "1", the ACK transmission processing unit 46 is requested to perform the ACK transmission processing.

In response to this request, the ACK transmission processing unit 46 adds data to the socket buffer in step S74, and immediately ACKs in step S75.
The TCP output routine is called by setting a flag for responding.

In step S73, the delay AC
If the K flag 43 is not set, that is, if it is set to "0", the process returns to step S51 of FIG. On the other hand, in step S55, if the sequence number to be received next and the value obtained by adding 1 to the maximum reception sequence number do not match, in step S56, the delay AC
The K flag 43 is set to "1", and the process returns to step S51.

Next, the operation and effect of the dynamic delay ACK control device in the mobile terminal device according to the second embodiment will be described. In the dynamic delay ACK control device 10b, the link state inspection processing unit 24 detects the occurrence of handover when moving between base station devices, and the dynamic delay ACK
When the response period flag setting unit 26 detects the occurrence of a handover, it sets a dynamic delay ACK response period flag 38 that indicates a dynamic delay ACK response period of a predetermined period from the occurrence of the handover, The delay ACK flag checking unit 30 checks whether the dynamic delay ACK response period flag 38 is set at the time of receiving a packet from the base station device, and further, the timer processing units 28 and 36, the reception sequence number checking unit 44, and the delay ACK. In the response period flag setting unit 46 control means, when the setting of the dynamic delayed ACK response period flag 38 is confirmed by the delayed ACK flag inspection unit 30, the reception sequence number which is the number of the packet received from the base station device is originally If it is not the sequence number to be received, the packet with the duplicated sequence number is sent to the base station device. To refrain from Shin, dynamic delay AC to a fixed period delays the ACK response received packet
K control is performed.

Therefore, in the dynamic delay ACK response period, if the sequence number of the packet received from the base station device does not match the sequence number to be originally received, it is possible to detect that there is a possibility of order inversion. it can. At this time, the delayed ACK response period starts, and the dynamic delay AC
By the K control, the ACK response can be transmitted at the transmission timing where the sequence numbers do not overlap.

Further, the reception sequence number inspection unit 44, which is a component of the control means, inspects whether the reception sequence number and the sequence number to be originally received match / mismatch, and the delayed ACK response period flag setting unit 46 When the above inspection results do not match, the delayed ACK response period flag 39 indicating the execution period of the dynamic delayed ACK control is set, and the timer processing unit 28 sets the dynamic delayed ACK response period flag 38 at the time of setting. The timer processing unit 48 is activated and measures the time for releasing the dynamic delay ACK response period flag 38.
Is activated when the delayed ACK response period flag 39 is set,
The time for releasing the delayed ACK response period flag 39 is timed, and the time for the transmission timing of the ACK response in the dynamic delayed ACK control is timed.

Accordingly, in the dynamic delayed ACK response period, if the dynamic delayed ACK response period flag 38 is set but the delayed ACK response period flag 39 is not set, the order inversion may not have occurred yet. Since it can be confirmed, the delayed ACK response period is not entered, and therefore the immediate ACK response transmission process can be performed when the packet is received. On the other hand, when the order inversion occurs after the occurrence of the handover, the dynamic delay ACK control can be performed by maintaining the setting of the delay ACK response period flag 39 in the timer processing unit 48, and the second delay ACK control is performed at the time of the control. The ACK response can be transmitted at the transmission timing instructed by the timer timing operation.

Further, the reception sequence number checking unit 44 is
Updating the maximum reception sequence number according to the reception sequence number when the dynamic delay ACK response period flag 38 is set,
After updating the sequence number to be received next when the received sequence number and the sequence number to be originally received match, if the sequence number to be received next and the value of the maximum received sequence number + 1 match, timer processing is performed. Part 2
8 and 48 are stopped and the delayed ACK response period flag 39 is released.

Therefore, when the reception sequence number is larger than the maximum reception sequence number, the maximum reception sequence number is updated (changed) to the reception sequence number. If it is small, it is left as it is. After that, if the sequence number to be received matches the value of the maximum reception sequence number + 1, there is no need to perform the dynamic delay ACK control, so the timer processing units 28 and 48 are stopped and the delay ACK response period flag 39 is set. To cancel. This allows the dynamic delay AC
The K control ends, and normal ACK response processing is performed.

Also, the delayed ACK response period flag setting unit 4
6 is delayed ACK by the reception sequence number inspection unit 44.
When the packet is received from the base station device while the setting of the response period flag 39 is confirmed, the delayed ACK flag 43 is set.

Therefore, in the delayed ACK response period, if the delayed ACK flag 43 is set, it can be recognized that all the packets with the sequence number smaller than the sequence number to be received next are recognized, so that the timer processing unit After the timeout of 48, transmission processing of the immediate ACK response can be performed.

[0108]

As described above, the dynamic delay ACK control device in the mobile terminal device and the dynamic delay ACK control method in the mobile terminal device of the present invention detect the occurrence of handover, and at the time of this detection, Whether the first flag indicating that it is a dynamic delay ACK response period of a predetermined period from the occurrence of handover is set, and whether the first flag is set when a packet is received from the base station device If the first flag setting is confirmed by this inspection, dynamic delay ACK control for delaying the ACK response of the packet received from the base station device for a certain period is performed, so that Mobi can be used at the time of handover.
Overlap A due to the reversal of packet reception order when a temporary route duplication occurs when the route optimization function of le IP is applied
It is possible to eliminate the CK response, thereby eliminating unnecessary packet retransmission at the server and improving the throughput of the entire communication.

Further, in the dynamic delay ACK control device in the mobile terminal device and the dynamic delay ACK control method in the mobile terminal device according to the present invention, it is activated when the first flag is set, and then the first flag is released. The period during which the order inversion after the occurrence of the handover occurs by measuring the time to be performed, starting at the time of setting the first flag, and then measuring the time of the transmission timing of the ACK response in the dynamic delay ACK control. In addition, the dynamic delay ACK control can be performed by maintaining the setting of the first flag in the first timing step, and the sequence numbers instructed by the timing operation of the second timing step do not overlap during the control. There is an effect that the ACK response can be transmitted at the transmission timing.

Further, in the dynamic delay ACK control device in the mobile terminal device and the dynamic delay ACK control method in the mobile terminal device according to the present invention, when the setting of the first flag is confirmed, the packet is transmitted from the base station device. Is received, the second flag indicating that all packets having a sequence number smaller than the sequence number to be received next is received is set, thereby setting the dynamic delay ACK response period (first flag setting In the period), if the second flag is set, it can be recognized that all packets with a sequence number smaller than the sequence number to be received next are received, so an immediate ACK is issued after the second timing step times out. There is an effect that a response transmission process can be performed.

The dynamic delay ACK control device in the mobile terminal device and the dynamic delay ACK control method in the mobile terminal device of the present invention detect the occurrence of handover,
At the time of this detection, a first flag indicating that it is a dynamic delay ACK response period of a predetermined fixed period from the occurrence of the handover is set, and the first flag is received when a packet is received from the base station device. Is set, and when the setting of the first flag is confirmed by this check, the received sequence number, which is the number of the packet received from the base station device, is not the sequence number to be originally received. In order to refrain from transmitting a packet having a duplicated sequence number to the base station apparatus, dynamic delay ACK control is performed to delay the ACK response of the received packet for a certain period. As a result, in the dynamic delay ACK response period (first flag setting period), if the sequence number of the packet received from the base station device does not match the sequence number to be originally received, the order may be reversed. Can be detected. At this time, there is an effect that the delayed ACK response period is entered and the ACK response can be transmitted at a transmission timing where the sequence numbers do not overlap due to the dynamic delayed ACK control.

Further, in the dynamic delay ACK control device in the mobile terminal device and the dynamic delay ACK control method in the mobile terminal device of the present invention, the match / mismatch between the received sequence number and the sequence number to be originally received is checked. , A second flag indicating that it is the execution period of the dynamic delay ACK control when the inspection result by this inspection does not match, is activated when the first flag is set, and thereafter,
The time to release the first flag is timed, the time to activate the second flag is set, and then the time to release the second flag is timed, and the transmission timing of the ACK response in the dynamic delay ACK control Time. As a result, in the dynamic delayed ACK response period, if the first flag is set but the second flag is not set, it can be confirmed that the order inversion has not occurred yet. Therefore, there is an effect that the transmission process of the immediate ACK response can be performed when the packet is received. On the other hand, when the order inversion occurs after the occurrence of the handover, the dynamic delay ACK control can be performed by maintaining the setting of the second flag, and at the transmission timing instructed by the timing operation at the time of the control. The effect is that an ACK response can be sent.

Further, in the dynamic delay ACK control device in the mobile terminal device and the dynamic delay ACK control method in the mobile terminal device of the present invention, the maximum reception sequence number is set according to the reception sequence number when the first flag is set. When the sequence number to be received next is updated and the sequence number to be received next is updated when the sequence number to be received next when the received sequence number and the sequence number to be originally received match. , Both of the above timing operations are stopped, and the second flag is cleared.
As a result, when the reception sequence number is larger than the maximum reception sequence number, the maximum reception sequence number is updated (changed) to the reception sequence number. If it is small, it is left as it is. After that, if the sequence number to be received matches the value of the maximum reception sequence number + 1, it is not necessary to perform the dynamic delay ACK control, so both timing operations are stopped and the second flag is released. As a result, the dynamic delay ACK control ends, and normal ACK response processing is performed.

Further, in the dynamic delay ACK control device in the mobile terminal device and the dynamic delay ACK control method in the mobile terminal device of the present invention, when the setting of the second flag is confirmed by the second checking step. If a packet is received from the base station device, the third flag is set. As a result, in the delayed ACK response period, if the third flag is set, it can be recognized that all packets with a sequence number smaller than the sequence number to be received next are recognized, so that the latter timing operation There is an effect that the transmission process of the immediate ACK response can be performed after the time-out.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a dynamic delay ACK control device in a mobile terminal device according to a first embodiment.

FIG. 2 is a diagram showing a procedure for performing a process of dynamic delay ACK control in a dynamic delay ACK control device in a mobile terminal device.

FIG. 3 is a diagram showing a procedure for performing a wireless link state inspection process in a dynamic delay ACK control device in a mobile terminal device.

FIG. 4 is a diagram showing a procedure of performing a normal ACK transmission process in a dynamic delay ACK control device in a mobile terminal.

FIG. 5 is a diagram showing a procedure for performing timer processing in a dynamic delay ACK control device in a mobile terminal device.

FIG. 6 is a configuration diagram of a dynamic delay ACK control device in a mobile terminal device according to a second embodiment.

[Fig. 7] Fig. 7 is a diagram illustrating a procedure of performing a process of dynamic delayed ACK control when the delayed delayed ACK control is not executed immediately after a handover in the dynamic delayed ACK control device in the mobile terminal device.

FIG. 8 is a diagram showing a procedure of performing delayed ACK response period start processing in a dynamic delayed ACK control device in a mobile terminal device.

FIG. 9 is a diagram showing a procedure of performing a delayed ACK response period end process in a dynamic delayed ACK control device in a mobile terminal device.

[Explanation of symbols]

10a, 10b ... Dynamic delay ACK in mobile terminal device
Control device, 12 ... Wireless data ring processing unit, 14 ... Wireless link control unit, 16 ... Transport protocol processing unit, 18 ... Network protocol processing unit, 20 ... Wireless link data processing unit, 22 ... BS list unit, 24
... Link state inspection processing unit, 16 ... Dynamic delay ACK response period flag setting unit, 28, 36, 48 ... Timer processing unit, 3
0 ... Delayed ACK flag check unit, 32 ... TCP packet reception processing unit, 34 ... ACK transmission processing unit, 38 ... Dynamic delay A
CK response period flag, 40, 43 ... Delayed ACK flag,
42 ... IP protocol processing unit, 39 ... Delayed ACK response period flag, 44 ... Reception sequence number check unit, 46 ... Delayed ACK response period flag setting unit, 60 ... Physical layer

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H04L 12/56 100 H04L 13/00 307Z 29/08 H04B 7/26 MF term (reference) 5K028 AA11 BB04 CC05 RR01 RR04 5K030 GA03 GA10 GA13 HA08 HC09 JL01 JT09 LA02 LB11 LC11 5K033 AA02 CB04 DA02 DA19 5K034 AA02 DD01 EE03 EE10 FF04 HH01 HH02 HH63 5K067 AA13 BB04 BB21 CC08 DD17 DD24 EE16EE02 EE02EE10EE

Claims (14)

[Claims] 1. A dynamic delay ACK control device in a mobile terminal device of a mobile communication network to which a route optimization function of a communication protocol is applied, and detection means for detecting occurrence of handover when moving between base station devices. , When the occurrence of the handover is detected, a dynamic delay ACK for a predetermined period from the occurrence of the handover
Setting means for setting a first flag indicating a response period; inspection means for inspecting whether or not the first flag is set at the time of receiving a packet from the base station device; ACK of the packet received from the base station device when the setting of the flag of 1 is confirmed.
A dynamic delay ACK control device in a mobile terminal device, comprising: a control unit that performs a dynamic delay ACK control that delays a response for a fixed period. 2. The control means is activated when the first flag is set, and is activated when the first timer is set, and a first timer that measures the time for releasing the first flag, and The dynamic delay ACK control device in a mobile terminal device according to claim 1, further comprising: a second timer that measures a time of a transmission timing of an ACK response in the dynamic delay ACK control. 3. The setting means, when a packet is received from the base station device when the setting of the first flag is confirmed by the first checking means, the setting means determines the sequence number to be received next. 3. The dynamic delay ACK control device in the mobile terminal device according to claim 1, wherein a second flag is set to indicate that all packets having a smaller sequence number are received. 4. A dynamic delay ACK control device in a mobile terminal device of a mobile communication network to which a route optimization function of a communication protocol is applied, and detection means for detecting occurrence of handover when moving between base station devices. , When the occurrence of the handover is detected, a dynamic delay ACK for a predetermined period from the occurrence of the handover
Setting means for setting a first flag indicating a response period; first checking means for checking whether or not the first flag is set when a packet is received from the base station device; When the setting of the first flag is confirmed by the inspection means of No. 1, if the received sequence number, which is the number of the packet received from the base station device, is not the sequence number to be originally received, the duplicated sequence number In order to refrain from transmitting packets to the base station device,
A dynamic delay ACK control device in a mobile terminal device, comprising: a setting unit that performs a dynamic delay ACK control that delays the ACK response of the received packet for a predetermined period. 5. The control means, if the second inspection means for inspecting the match / mismatch between the received sequence number and the sequence number to be originally received does not match the inspection result by the second inspection means. Second setting means for setting a second flag indicating that it is the execution period of the dynamic delay ACK control, and starting when the first flag is set,
A first timer for measuring the time for releasing the first flag and a timer for starting the time for setting the second flag to measure the time for releasing the second flag, and in the dynamic delay ACK control The dynamic delay ACK control device in a mobile terminal device according to claim 4, further comprising: a second timer that measures a time of a transmission timing of an ACK response. 6. The second checking means updates the maximum reception sequence number in accordance with the reception sequence number when the first flag is set, and the reception sequence number matches the sequence number that should be originally received. Sometimes after updating the sequence number to be received next, if the sequence number to be received next and the value of the maximum received sequence number + 1 match, the first and second timers are stopped and the The dynamic delay A in the mobile terminal device according to claim 5, wherein the second flag is released.
CK controller. 7. The third flag if the second setting unit receives a packet from the base station device when the setting of the second flag is confirmed by the second checking unit. The dynamic delay ACK control device in the mobile terminal device according to claim 5, wherein 8. A dynamic delay ACK control method in a mobile terminal device of a mobile communication network to which a route optimization function of a communication protocol is applied, the detection step of detecting occurrence of handover when moving between base station devices. A setting step of setting a first flag indicating a dynamic delay ACK response period of a predetermined fixed period from the occurrence of the handover when the occurrence of the handover is detected in the detecting step; From the base station device when an inspection step of inspecting whether or not the first flag is set when a packet is received from the station device; and when the setting of the first flag is confirmed by the inspection in the inspection step. A control step that performs dynamic delay ACK control that delays the ACK response of the received packet for a certain period. Dynamic Delay ACK control method in a mobile terminal apparatus characterized by comprising and. 9. The control step is started at the time of setting the first flag, and is started at the time of setting the first flag; and a first time counting step of measuring a time for releasing the first flag. , ACK in the dynamic delay ACK control
9. A dynamic delay ACK control method in a mobile terminal device according to claim 8, further comprising a second timing step of timing a response transmission timing. 10. The setting step, when a packet is received from the base station device when the setting of the first flag is confirmed by the first checking step,
The dynamic delay in the mobile terminal device according to claim 8 or 9, wherein a second flag indicating that all packets having a sequence number smaller than a sequence number to be received next is received is set. ACK control method. 11. A detection step of detecting occurrence of a handover when moving between base station devices in a dynamic delay ACK control method in a mobile terminal device of a mobile communication network to which a route optimization function of a communication protocol is applied. A setting step of setting a first flag indicating a dynamic delay ACK response period of a predetermined fixed period from the occurrence of the handover when the occurrence of the handover is detected in the detecting step; A first check step for checking whether or not the first flag is set when a packet is received from the station device; and when the setting of the first flag is confirmed by the first check step, The received sequence number, which is the number of the packet received from the base station device, must be the sequence number that should be originally received. For example, in order to refrain from transmitting a packet having a duplicated sequence number to the base station device, a setting step of performing dynamic delay ACK control for delaying the ACK response of the received packet for a certain period is provided. Method for dynamically delaying ACK in a mobile terminal device that operates. 12. The control step comprises: a second inspection step for inspecting a match / mismatch between the received sequence number and a sequence number to be originally received, and an inspection result obtained by the second inspection step does not match. And a second setting step of setting a second flag indicating that it is the execution period of the dynamic delay ACK control, and a time of starting the first flag and releasing the first flag. A first timing step for timing and a time for starting the second flag and resetting the second flag at the time of setting the second flag, and timing the transmission timing of the ACK response in the dynamic delay ACK control. The dynamic delay ACK control method in a mobile terminal device according to claim 11, further comprising: 13. The second inspection step includes the first inspection step.
The maximum reception sequence number is updated according to the reception sequence number when the flag is set, and the sequence number to be received next when the reception sequence number and the sequence number that should be originally received are updated, and then the next Sequence number to be received and the maximum received sequence number + 1
13. The dynamic delay ACK control in the mobile terminal device according to claim 12, wherein the first and second timing steps are stopped and the second flag is canceled when the values of the two match. Method. 14. The second setting step comprises:
13. The mobile terminal according to claim 12, wherein the third flag is set when a packet is received from the base station device when the setting of the second flag is confirmed by the checking step of. Dynamic delay ACK in device
Control method.