COMMUNICATION UNIT, COMMUNICATION SYSTEM, COMMUNICATION METHOD AND COMMUNICATION PROGRAM
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Accused Products
Abstract
A transmission-time measurement section (201) and a jitter measurement section (202) measure transmission time length and jitter, respectively, by using the packets transmitted/received. A forward-error-correction (FEC)-scheme maximum-jitter measurement section (203) calculates a maximum jitter in the case of adopting an FEC scheme, and an automatic-retransmission-request (ARQ)-scheme maximum-jitter measurement section (204) calculates a maximum jitter in the case of adopting an ARQ scheme from the measured information. A packet control section (205) selects a communication scheme having a smaller maximum jitter from both schemes based on the calculation result of the FEC-maximum-jitter measurement section (203) and ARQ-maximum-jitter measurement section (204).
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Citations
36 Claims
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1-14. -14. (canceled)
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15. A communication unit comprising:
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a transmission-time measurement section that calculates a transmission time length of a packet; a jitter measurement section that calculates an average value of jitter based on an arrival time of the packet; an FEC-maximum-jitter measurement section that calculates, based on a relative redundancy determined beforehand, a first estimated maximum jitter representing a maximum jitter estimated in a case of selecting a forward error correction (FEC) scheme; an ARQ-maximum-jitter measurement section that calculates, based on said transmission time length and said average value of jitter, a second estimated maximum jitter representing a maximum jitter estimated in a case of selecting an automatic repeat request (ARQ) scheme; and a packet control section that selects said FEC scheme if said first estimated maximum jitter is smaller than said second estimated maximum jitter, and selects said ARQ scheme if said first estimated maximum jitter is larger than said second estimated maximum jitter. - View Dependent Claims (16, 17)
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18. A communication unit comprising:
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a transmission-time measurement section that calculates a transmission time length of a packet; a jitter measurement section that calculates an average value of jitter based on a arrival time of the packet; a packet-loss-rate measurement section that calculates a packet loss rate based on a sequential number of received packets; a relative-redundancy calculation section that calculates, based on said packet loss rate and a requested reproduction signal quality, a relative redundancy which can realize a requested reproduction signal quality in a forward error correction (FEC) scheme; a retransmission-time calculation section that calculates, based on said packet loss rate and said requested reproduction signal quality, a number of times of retransmission that can realize said requested reproduction signal quality in an automatic repeat request (ARQ) scheme; an FEC-maximum-jitter measurement section (306) that calculates, based on said calculated relative redundancy, a first estimated maximum jitter representing a maximum jitter estimated in a case of selecting said FEC scheme; an ARQ-maximum-jitter measurement section that calculates, based on said calculated number of times of retransmission, a second estimated maximum jitter representing a maximum jitter estimated in a case of selecting said ARQ scheme; and a packet control section that selects said FEC scheme if said first estimated maximum jitter is smaller than said second estimated maximum jitter, and selects said ARQ scheme if said first estimated maximum jitter is larger than said second estimated maximum jitter. - View Dependent Claims (19)
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20. A communication system comprising a transmitting-side unit including a first communication unit, a receiving-side unit including a second communication unit, and a network connecting together said transmitting-side unit and said receiving-side unit, wherein each of the.
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21. A communication method comprising the steps of:
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calculating, based on a relative redundancy determined beforehand, a first estimated maximum jitter representing a maximum jitter estimated in a case of selecting a forward error correction (FEC) scheme; calculating a transmission time length of a packet; calculating an average value of jitter based on an arrival time of the packet; calculating, based on the average value of jitter, a second estimated maximum jitter representing a maximum jitter estimated in a case of selecting an automatic repeat request (ARQ) scheme; selecting the (FEC) scheme if said first estimated maximum jitter is smaller than said second estimated maximum jitter, and selecting said ARQ scheme if said first estimated maximum jitter is larger than said second estimated maximum jitter. - View Dependent Claims (22)
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23. A communication method comprising the steps of:
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calculating a transmission time length of a packet; calculating an average value of jitter based on a arrival time of the packet; calculating a packet loss rate based on a sequential number of received packets; calculating, based on said packet loss rate and a requested reproduction signal quality, a relative redundancy which can realize a requested reproduction signal quality in a forward error correction (FEC) scheme; calculating, based on said packet loss rate and said requested reproduction signal quality, a number of times of retransmission that can realize said requested reproduction signal quality in an automatic repeat request (ARQ) scheme; calculating, based on said calculated relative redundancy, a first estimated maximum jitter representing a maximum jitter estimated in a case of selecting said FEC scheme; calculating, based on said calculated number of times of retransmission, a second estimated maximum jitter representing a maximum jitter estimated in a case of selecting said ARQ scheme; and selecting said FEC scheme if said first estimated maximum selects said ARQ scheme if said first estimated maximum jitter is larger than said second estimated maximum jitter. - View Dependent Claims (24)
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25. A computer readable medium encoded with a computer program defining the steps of:
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calculating, based on a relative redundancy determined beforehand, a first estimated maximum jitter representing maximum jitter estimated in a case of selecting a forward error correction (FEC) scheme; calculating a transmission time length of a packet; calculating an average value of jitter based on an arrival time of the packet; calculating, based on the average value of jitter, a second estimated maximum jitter representing a maximum jitter estimated in a case of selecting an automatic repeat request (ARQ) scheme; and selecting the FEC scheme if said first estimated maximum jitter is smaller than said second estimated maximum jitter, and selecting said ARQ scheme if said first estimated maximum jitter is larger than said second estimated maximum jitter. - View Dependent Claims (26)
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27. A computer readable medium encoded with a computer program defining the steps of:
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calculating a transmission time length of a packet; calculating an average value of jitter based on a arrival time of the packet; calculating a packet loss rate based on a sequential number of received packets; calculating, based on said packet loss rate and a requested reproduction signal quality, a relative redundancy which can realize a requested reproduction signal quality in a forward error correction (FEC) scheme; calculating, based on said packet loss rate and said requested reproduction signal quality, a number of times of retransmission that can realize said requested reproduction signal quality in an automatic repeat request (ARQ) scheme; calculating, based on said calculated relative redundancy, a first estimated maximum jitter representing a maximum jitter estimated in a case of selecting said FEC scheme; calculating, based on said calculated number of times of retransmission, a second estimated maximum jitter representing a maximum jitter estimated in a case of selecting said ARQ scheme; and selecting said FEC scheme if said first estimated maximum jitter is smaller than said second estimated maximum jitter, and selects said ARQ scheme if said first estimated maximum jitter is larger than said second estimated maximum jitter. - View Dependent Claims (28)
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29. A communication unit comprising:
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a modulation scheme evaluation section for calculating indexes each representing a quality degradation of a corresponding one of a plurality of modulation schemes with respect to a transmission pattern of a packet; and a packet control section for comparing said indexes against one another, to select one of said modulation schemes providing a minimum index. - View Dependent Claims (31)
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30. A communication system comprising:
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a network measurement section for measuring a network state through which a packet is transmitted; a modulation scheme evaluation section for evaluating indexes each representing a quality degradation of a corresponding one of a plurality modulation schemes; and a packet control section for comparing said indexes against one another, to select one of said modulation schemes providing a minimum index. - View Dependent Claims (36)
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32. A communication method comprising:
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calculating indexes each representing a quality degradation of a corresponding one of a plurality of modulation schemes with respect to a transmission pattern of a packet; and comparing said indexes against one another, to select one of said modulation schemes providing a minimum index.
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33. A communication method comprising:
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measuring a network state through which a packet is transmitted; evaluating indexes each representing a quality degradation of a corresponding one of a plurality modulation schemes; and comparing said indexes against one another, to select one of said modulation schemes providing a minimum index.
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34. A computer readable program encoded with a computer program defining:
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calculating indexes each representing a quality degradation is of a corresponding one of a plurality of modulation schemes with respect to a transmission pattern of packet; and comparing said indexes against one another, to select one of said modulation schemes providing a minimum index.
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35. A computer readable program encoded with a computer program defining:
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measuring a network state through which a packet is transmitted; evaluating indexes each representing a quality degradation of a corresponding one of a plurality modulation schemes; and comparing said indexes against one another, to select one of said modulation schemes providing a minimum index.
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Specification