KR101275521B1 - Apparatus for controlling power of wimedia media access control device and method using the same - Google Patents

Abstract

Disclosed are a power control device and method for a WiMedia Mac device. The method for controlling power of a WiMedia Mac device according to the present invention may include determining whether a fragment of a MAC Service Data Unit (MSDU) is lost when a fragment is received, and when the fragment of the Mac Service Data Unit is lost. Extracting a duration field from the received fragment and switching a power mode to a predetermined low power mode for a time set in the duration field.

Wimedia, MAC, MSDU, Power Control, Fragment Loss

Description

Power control device and method of WiMedia Mac device {APPARATUS FOR CONTROLLING POWER OF WIMEDIA MEDIA ACCESS CONTROL DEVICE AND METHOD USING THE SAME}

1 is a system diagram of an embodiment for explaining a power control device of a WiMedia Mac device of the present invention.

2 is a block diagram illustrating a power control device of a Wimedia MAC device according to an embodiment of the present invention.

3 is a flowchart illustrating a power control method of a Wimedia MAC device according to an embodiment of the present invention.

4 is an operation flowchart for step S320 shown in FIG.

5 is an exemplary view for explaining a power control method of a Wimedia MAC device according to the present invention.

<Explanation of symbols for the main parts of the drawings>

210: receiver

220: loss determination unit

230: period field extraction unit

240: power mode switching unit

The present invention relates to power control of a Media Access Control (MAC) device, and more particularly, to a power control device and method for a WiMedia Mac device that can reduce unnecessary power consumption in a receiving Media W device. It is about.

The power modes of Wimedia MAC devices include hibernation mode, which consumes less power, and active mode, which consumes more power than hibernation.

In general, a Wimedia MAC device operates in an active mode when receiving a fragment of a MAC Service Data Unit (MSDU) transmitted from a transmitting Wimedia MAC device.

The Wimedia MAC device operating in the No ACK mode does not receive the MSDU when the fragment of the MSDU transmitted from the transmitting Wimedia MAC device is lost.

However, even if the Wimedia MAC device does not receive the fragment of the MSDU, the power mode must be maintained in the active mode because the number of fragments of the MSDU transmitted from the transmitting Wimedia MAC device and the time taken for transmitting the MSDU are not known.

That is, since the Wimedia MAC device maintains the active mode for the time required to transmit the MSDU when the fragment of the MSDU is lost, unnecessary power consumption occurs.

Therefore, there is a need for a device that transmits time information for transmitting MSDU transmission time and the receiving Wimedia MAC device can control the power mode when the fragment of the MSDU is lost.

The present invention has been made to solve the problems of the prior art as described above, and aims to reduce unnecessary power consumption of the Wimedia MAC device when the fragment of the MSDU is lost.

In addition, an object of the present invention is to reduce unnecessary power consumption of the Wimedia MAC device based on the time information set in the transmitting Wimedia MAC device when the fragment of the MSDU is lost.

In addition, an object of the present invention is to reduce unnecessary power consumption in the active mode of the Wimedia MAC device when the fragment of the MSDU is lost.

In order to achieve the above object and to solve the problems of the prior art, the power control method of the WiMedia Mac device of the present invention whether the fragments of the MAC Service Data Unit (MSDU) when receiving a fragment (fragment) Determining, if a fragment of the Mac service data unit is lost, extracting a duration field from the received fragment and switching the power mode to a predetermined low power mode for a time set in the duration field; It is characterized by including.

The determining whether the fragment is lost may include comparing the sequence number of the received fragment with the sequence number of the expected fragment, and if the sequence number of the received fragment is larger than the sequence number of the expected fragment, the MAC service. It may be determined that the fragment of the data unit is lost.

In this case, the sequence number includes a MAC service data unit identifier and a fragment number, and determining whether the fragment is lost comprises: the MAC service data unit identifier of the sequence number of the received fragment and the sequence number of the expected fragment. If the same, the fragment number of the received fragment is compared with the fragment number of the expected fragment, and if the fragment number of the received fragment is larger than the fragment number of the expected fragment, it may be determined that the fragment of the Mac service data unit is lost. have.

In this case, the power control method of the WiMedia Mac device may be applied to the WiMedia Mac device operating in a No ACK mode.

In this case, the time set in the period field may be a time from the received fragment to the last fragment of the Mac service data unit.

In this case, the power control method of the WiMedia Mac device may further include switching the power mode from the low power mode to the active mode after a time set in the period field.

In this case, the power control method of the WiMedia Mac device may be applied to a PRI (Prioritized Contention Access) method or a Distributed Reservation Protocol (DRP) method.

In this case, the low power mode may be an idle mode or a sleep mode.

The power control apparatus of the WiMedia Mac device of the present invention may include a loss determination unit determining whether a fragment of a Mac service data unit is lost when receiving a fragment, and extracting a period field from the received fragment when the fragment of the Mac service data unit is lost. And a power mode switching unit for switching the power mode to a predetermined low power mode for a time set in the period field.

In this case, the loss determining unit compares the sequence number of the received fragment with the sequence number of the expected fragment, and if the sequence number of the received fragment is larger than the sequence number of the expected fragment, the fragment of the Mac service data unit is lost. You can judge.

At this time, the power control device of the WiMedia Mac device may operate in the No ACK mode.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a system diagram of an embodiment for explaining a power control device of a WiMedia Mac device of the present invention.

Referring to FIG. 1, the system includes a sending Wimedia MAC device 110 and a receiving Wimedia MAC device 120. Here, the transmitting Wimedia MAC device 110 and the receiving Wimedia MAC device 120 operate in a No Acknowledgment (ACK) mode.

The transmitting Wimedia MAC device 110 divides the MAC Service Data Unit (MSDU) into a predetermined number of fragments and transmits it to the receiving Wimedia MAC device 120.

In this case, the transmitting Wimedia MAC device 110 and the receiving Wimedia MAC device 120 may transmit / receive the fragment of the MSDU in a Privilized Contention Access (PCA) method or a Distributed Reservation Protocol (DRP) method.

In this case, the transmitting Wimedia MAC device 110 may transmit the fragment of the MSDU to the receiving Wimedia MAC device 120 by including the sequence number of the fragment in the MAC header.

Here, the sequence number includes an MSDU delimiter (ID) and a fragment number. The MSDU delimiter is a component for identifying the MSDU, and the fragment number is a component for confirming the order of divided fragments of the MSDU.

At this time, the fragment of the MSDU transmitted from the transmitting Wimedia MAC device 110 to the receiving Wimedia MAC device 120 is a duration field in which the time from the fragment of the MSDU to the fragment of the MSDU having the last fragment number is set. field).

The receiving Wimedia MAC device 120 receives the fragment of the MSDU transmitted from the transmitting Wimedia MAC device 110 and determines whether the fragment of the MSDU is lost based on the sequence number of the received MSDU fragment and the sequence number of the expected fragment. .

At this time, the receiving side Wimedia MAC device 120 may determine that the fragment of the MSDU is lost when the fragment number of the received MSDU fragment is larger than the fragment number of the expected fragment.

If the fragment of the MSDU is lost, the receiving Wimedia MAC device 120 extracts the period field configured in the fragment of the received MSDU, and checks the time from the fragment field of the received MSDU to the last fragment time of the MSDU from the period field. During that time, the power mode is switched from the active mode to the predetermined low power mode.

In this case, the low power mode may be an idle mode or a sleep mode.

2 is a block diagram illustrating a power control device of a Wimedia MAC device according to an embodiment of the present invention.

Referring to FIG. 2, a power control apparatus of a Wimedia MAC device includes a receiver 210, a loss determiner 220, a period field extractor 230, and a power mode switcher 240.

The receiver 210 receives a fragment of the MSDU transmitted from the transmitting Wimedia MAC device.

When the fragment of the MSDU is received, the loss determination unit 220 determines whether the fragment of the MSDU is lost.

In this case, the loss determination unit 220 may determine whether the fragment of the MSDU is lost based on the sequence number of the received MSDU fragment and the sequence number of the expected fragment.

That is, the loss determination unit 220 compares the MSDU delimiter of the received MSDU fragment and the MSDU delimiter of the expected fragment, and when the two MSDU delimiters are the same, the fragment number of the MSDU is based on the fragment number of the received MSDU fragment and the fragment number of the expected fragment. Determine whether there is a loss.

In this case, the loss determination unit 220 may determine that the MSDU fragment is lost when the fragment number of the received MSDU fragment is larger than the fragment number of the expected fragment.

The period field extractor 230 extracts a period field from the received MSDU fragment when the MSDU fragment is lost.

In this case, the duration field may include time information set from the received MSDU fragment to the last fragment of the MSDU.

The power mode switching unit 240 switches the power mode of the Wimedia MAC device from the active mode to the low power mode for the time set in the extracted period field.

In this case, the low power mode may be an idle mode or a sleep mode.

The power mode switching unit 240 switches the power mode of the Wimedia MAC device from the low power mode to the active mode when the time set in the period field elapses after receiving the MSDU fragment.

That is, the Wimedia MAC device may reduce the unnecessary power consumption by switching the power mode from the active mode to the low power mode during the time in which the fragment of the MSDU fragment is transmitted from the transmitting Wimedia MAC device.

3 is a flowchart illustrating a power control method of a Wimedia MAC device according to an embodiment of the present invention.

Referring to FIG. 3, the method for controlling power of a Wimedia MAC device receives a fragment of an MSDU transmitted from a transmitting Wimedia MAC device (S310).

If a fragment of the MSDU is received, the Wimedia MAC device determines whether the fragment of the MSDU is lost (S320).

That is, when receiving the MSDU fragment, the Wimedia MAC device determines whether there is an MSDU fragment transmitted from the transmitting Wimedia MAC device between the previously received MSDU fragment and the currently received MSDU fragment.

In this case, the Wimedia MAC device may determine whether the fragment of the MSDU is lost based on the sequence number of the expected fragment and the sequence number of the received MSDU fragment.

Here, the sequence number includes the fragment's MSDU separator and the fragment number.

In this case, the Wimedia MAC device compares the MSDU delimiter of the received MSDU fragment and the MSDU delimiter of the expected fragment, and if the two MSDU delimiters are the same, whether the fragment of the MSDU is lost based on the fragment number of the received MSDU fragment and the fragment number of the expected fragment. Can be determined.

As a result of the determination in step S320, when the fragment of the MSDU is lost, the period field is extracted from the fragment of the received MSDU (S330).

Here, the duration field is a field in which the time from the fragment of the received MSDU to the last fragment of the MSDU having the same MSDU identifier is set.

When the duration field is extracted, the Wimedia MAC device switches the power mode from the active mode to the low power mode for the time set in the duration field (S340).

In this case, the low power mode may be an idle mode or a sleep mode.

The Wimedia MAC device determines whether the time set in the duration field has elapsed, and when the time set in the duration field has elapsed, the Wimedia MAC device switches from the low power mode to the active mode again (S350 and S360).

That is, the Wimedia MAC device switches to the low power mode during the MSDU transmission time with lost fragments to reduce power consumption, and when the MSDU transmission time with the lost fragments elapses, switches the power mode to active mode to receive the next MSDU. do.

The power control method of the Wimedia MAC device according to the present invention performing this process can be applied to the Wimedia MAC device operating in the No ACK mode.

In addition, the power control method of the Wimedia MAC device according to the present invention may be applied to the Privilized Contention Access (PCA) scheme or the Distributed Reservation Protocol (DRP) scheme.

4 is an operation flowchart for step S320 shown in FIG.

Referring to FIG. 4, the step of determining whether the fragment of the MSDU is lost extracts the MAC header from the fragment of the received MSDU (S410).

The Wimedia MAC device compares the sequence number of the fragment included in the MAC header with the sequence number of the expected fragment to be received by the Wimedia MAC device (S420).

Here, the sequence number includes an MSDU delimiter and a fragment number.

The Wimedia MAC device compares the MSDU delimiter of the received MSDU fragment with the MSDU delimiter of the expected fragment to determine whether the two delimiters are the same (S430).

That is, it is determined whether the fragment of the previously received MSDU and the fragment of the currently received MSDU are fragments of the same MSDU.

In operation S430, when the MSDU identifier of the received MSDU fragment and the MSDU identifier of the expected fragment are the same, it is determined whether the fragment number of the received MSDU fragment is larger than the fragment number of the expected fragment (S440).

If the fragment number of the received MSDU fragment is larger than the fragment number of the expected fragment, the Wimedia MAC device determines that the fragment of the MSDU is lost.

The power control method of the Wimedia MAC device according to the present invention will be further described with reference to FIG. 5.

5 is an exemplary view for explaining a power control method of a Wimedia MAC device according to the present invention.

As can be seen in FIG. 5, it can be seen that the MSDU is divided into seven fragments having an MSDU delimiter of 10 and a fragment number from 0 to 6.

Referring to FIG. 5, the Wimedia MAC device includes a fragment in which (MSDU identifier, fragment number) of the fragment transmitted from the transmitting Wimedia MAC device is (10, 0) and (10, 1) through the power control method according to the present invention. Since the fragment number of the fragment up to the fragment 510 is the same as the fragment number of the expected fragment, it is determined that the fragment of the MSDU is not lost.

On the other hand, since the fragment 520 (MSDU delimiter, fragment number) is (10, 2) is lost, the Wimedia MAC device receives the fragment 530 (MSDU delimiter, fragment number) is (10, 3).

Here, since the Wimedia MAC device has received up to the fragment whose (MSDU delimiter, fragment number) is (10, 1), the sequence number of the expected fragment (MSDU delimiter, fragment number) becomes (10, 2).

The Wimedia MAC device extracts the MAC header from the fragment 530 of the received MSDU and checks the sequence number of the MSDU fragment received from the MAC header.

The Wimedia MAC device determines whether the fragment of the MSDU is lost based on the received sequence number (10, 3) of the MSDU fragment and the sequence number (10, 2) of the expected fragment.

The Wimedia MAC device determines that the fragment of the MSDU having the MSDU identifier of "10" is lost because the fragment number "3" of the received MSDU fragment is larger than the fragment number "2" of the expected fragment.

Since the fragment of the MSDU is lost, the Wimedia MAC device extracts the period field from the fragment of the received MSDU and checks the time information D3 set in the period field.

Wimedia MAC devices reduce power consumption by switching power mode from active mode to low power mode for D3 hours.

The Wimedia MAC device switches the power mode from low power mode back to active mode to receive the next MSDU after the D3 time.

The power control method of the WiMedia Mac device according to the present invention may be implemented in the form of program instructions that can be executed by various computer means and recorded in a computer readable medium. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. The program instructions recorded on the medium may be those specially designed and constructed for the present invention or may be available to those skilled in the art of computer software. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks, such as floppy disks. Magneto-optical media, and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. The medium may be a transmission medium such as an optical or metal line, a wave guide, or the like, including a carrier wave for transmitting a signal designating a program command, a data structure, or the like. Examples of program instructions include not only machine code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like. The hardware device described above may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

As described above, the present invention has been described by way of limited embodiments and drawings, but the present invention is not limited to the above embodiments, and those skilled in the art to which the present invention pertains various modifications and variations from such descriptions. This is possible.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the equivalents of the claims, as well as the claims.

The apparatus and method for controlling power of a Wimedia MAC device according to an embodiment of the present invention can reduce unnecessary power consumption of the Wimedia MAC device when the fragment of the MSDU is lost.

In addition, the present invention can reduce unnecessary power consumption of the Wimedia MAC device based on the time information set in the transmitting Wimedia MAC device when the fragment of the MSDU is lost.

In addition, the present invention can reduce unnecessary power consumption in the active mode of the Wimedia MAC device when the fragment of the MSDU is lost.

Claims (21)

Determining whether a fragment of a MAC Service Data Unit (MSDU) is lost when a fragment is received; Extracting a duration field from the received fragment when the fragment of the Mac service data unit is lost; And Switching the power mode to a predetermined low power mode for a time set in the period field; Including, Determining whether or not the fragment is lost Comparing the sequence number of the received fragment with the sequence number of the expected fragment and determining that the fragment of the Mac service data unit is lost when the sequence number of the received fragment is larger than the sequence number of the expected fragment. How to control power on WiMedia Mac devices. delete The method of claim 1, The sequence number is A Mac service data unit identifier and fragment number, Determining whether or not the fragment is lost When the sequence number of the received fragment and the MAC service data unit identifier of the sequence number of the expected fragment are the same, the fragment number of the received fragment and the fragment number of the expected fragment are compared and the fragment number of the received fragment is the same. Determining that the fragment of the Mac service data unit is lost if it is larger than the fragment number of the expected fragment. Power control method of the WiMedia Mac device, characterized in that. The method of claim 1, The power control method of the WiMedia Mac device Switching the power mode from the low power mode to the active mode after a time set in the period field Power control method of the WiMedia Mac device further comprising a. A computer-readable recording medium having recorded thereon a program for performing the method of any one of claims 1 and 3 to 4. A loss determination unit that determines whether a fragment of a MAC service data unit (MSDU) is lost when a fragment is received; A period field extracting unit extracting a duration field from the received fragment when a fragment of the MAC service data unit is lost; And Power mode switching unit for switching the power mode to a predetermined low power mode for the time set in the period field Including, The loss determination unit Comparing the sequence number of the received fragment with the sequence number of the expected fragment and determining that the fragment of the Mac service data unit is lost when the sequence number of the received fragment is larger than the sequence number of the expected fragment. Power control device for WiMedia Mac devices. delete The method of claim 6, The sequence number is A Mac service data unit identifier and fragment number, The loss determination unit When the sequence number of the received fragment and the MAC service data unit identifier of the sequence number of the expected fragment are the same, the fragment number of the received fragment and the fragment number of the expected fragment are compared and the fragment number of the received fragment is the same. Determining that the fragment of the Mac service data unit is lost if it is larger than the fragment number of the expected fragment. Power control device of the WiMedia Mac device, characterized in that. The method of claim 6, The time set in the period field is The time from the received fragment to the last fragment of the Mac service data unit Power control device of the WiMedia Mac device, characterized in that. The method of claim 6, The power mode switching unit Switching the power mode from the low power mode to the active mode after a time set in the period field Power control device of the WiMedia Mac device, characterized in that. delete delete delete delete delete delete delete delete delete delete delete

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