Apparatus for controlling power of WiMedia media access control device and method using the same
First Claim
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1. A method of controlling power of a receiving wireless multimedia media access control (WiMedia MAC) device, the method comprising:
- determining whether a previous fragment of an MAC service data unit (MSDU) received by the receiving WiMedia MAC device is lost by the receiving WiMedia MAC device when a fragment is received by the receiving WiMedia MAC device;
extracting a duration field from the received fragment if it is determined that the previous fragment of the MSDU is lost;
converting a power mode of the receiving WiMedia MAC device into a low power mode during a period of time extracted from the duration field; and
converting the low power mode of the receiving WiMedia MAC device into an active mode after the period of time extracted from the duration field,wherein the determining whether the previous fragment is lost comprises;
comparing a sequence number of the received fragment and a sequence number of an expected fragment; and
determining that the previous fragment of the MSDU is lost if the sequence number of the received fragment is greater than the sequence number of the expected fragment,wherein the period of time extracted from the duration field corresponds to a period of from when the received fragment is received by the receiving WiMedia MAC device to a period of time when a final fragment of the MSDU is received by the receiving WiMedia MAC device.
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Abstract
An apparatus and method of controlling power of a wireless multimedia media access control (WiMedia MAC) device are provided. The method includes: determining whether a fragment of an MAC service data unit (MSDU) is lost when a fragment is received; extracting a duration field from the received fragment if it is determined that the fragment of the MSDU is lost; and converting a power mode into a low power mode during a period of time established in the duration field.
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15 Claims
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1. A method of controlling power of a receiving wireless multimedia media access control (WiMedia MAC) device, the method comprising:
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determining whether a previous fragment of an MAC service data unit (MSDU) received by the receiving WiMedia MAC device is lost by the receiving WiMedia MAC device when a fragment is received by the receiving WiMedia MAC device; extracting a duration field from the received fragment if it is determined that the previous fragment of the MSDU is lost; converting a power mode of the receiving WiMedia MAC device into a low power mode during a period of time extracted from the duration field; and converting the low power mode of the receiving WiMedia MAC device into an active mode after the period of time extracted from the duration field, wherein the determining whether the previous fragment is lost comprises; comparing a sequence number of the received fragment and a sequence number of an expected fragment; and determining that the previous fragment of the MSDU is lost if the sequence number of the received fragment is greater than the sequence number of the expected fragment, wherein the period of time extracted from the duration field corresponds to a period of from when the received fragment is received by the receiving WiMedia MAC device to a period of time when a final fragment of the MSDU is received by the receiving WiMedia MAC device. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A non-transitory computer-readable recording medium storing a program for implementing a method of controlling power of a receiving wireless multimedia media access control (WiMedia MAC) device, the method comprising:
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determining whether a previous fragment of an MAC service data unit (MSDU) received by the receiving WiMedia MAC device is lost by the receiving WiMedia MAC device when a fragment is received by the receiving WiMedia MAC device; extracting a duration field from the received fragment if it is determined that the previous fragment of the MSDU is lost; converting a power mode of the receiving WiMedia MAC device into a low power mode during a period of time extracted from the duration field; and converting the low power mode of the receiving WiMedia MAC device into an active mode after the period of time extracted from the duration field, wherein the determining whether the previous fragment is lost comprises; comparing a sequence number of the received fragment and a sequence number of an expected fragment; and determining that the previous fragment of the MSDU is lost if the sequence number of the received fragment is greater than the sequence number of the expected fragment, wherein the period of time extracted from the duration field corresponds to a period of time from when the received fragment is received by the receiving WiMedia MAC device to a period of time when a final fragment of the MSDU is received by the receiving WiMedia MAC device.
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9. An apparatus for controlling power of a receiving wireless multimedia media access control (WiMedia MAC) device, the apparatus comprising:
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a loss determiner which determines whether a previous fragment of an MAC service data unit (MSDU) received by the receiving WiMedia MAC device is lost by the receiving WiMedia MAC device when a fragment is received by the receiving WiMedia MAC device; a duration field extractor which extracts a duration field from the received fragment if the loss determiner determines that the previous fragment of the MSDU is lost; a power mode converter which converts a power mode of the receiving WiMedia MAC device into a low power mode during a period of time extracted from the duration field, and converts the low power mode of the receiving WiMedia MAC device into an active mode after the period of time extracted from the duration field, wherein the loss determiner compares a sequence number of the received fragment and a sequence number of an expected fragment, and determines that the previous fragment of the MSDU is lost when the sequence number of the received fragment is greater than the sequence number of the expected fragment, wherein the period of time extracted from the duration field corresponds to a period of time from when the received fragment is received by the receiving WiMedia MAC device to a period of time when a final fragment of the MSDU is received by the receiving WiMedia MAC device. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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Specification