Communication device
First Claim
1. A communication device for performing wireless communication, comprising:
- a measurement-period holding unit which holds for measurement of delay profiles values of a measurement period in correspondence with values indicating one or a combination of a wireless condition or a service quality level;
a change recognition unit which recognizes a change in at least one of the wireless condition and the service quality level, and notifies a measurement-period acquisition unit of the change;
said measurement-period acquisition unit which acquires from said measurement-period holding unit a value of the measurement period corresponding to said change of which the measurement-period acquisition unit is notified by the change recognition unit; and
a delay-profile measurement unit which repeats the measurement of the delay profiles with the measurement period determined by said value acquired by the said measurement-period acquisition unit during a time which is necessary and appropriate for the measurement.
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Accused Products
Abstract
A communication device measures delay profiles by changing a measurement period and a measurement time to appropriate values according to measurement conditions so as to improve transmission quality. A measurement-period holding unit holds for measurement of delay profiles values of the measurement period in correspondence with values indicating one or a combination of a wireless condition or a service quality level. For example, the wireless condition indicates the number of spreading codes, and the service quality level indicates reception quality. A change recognition unit recognizes a change in at least one of the wireless condition and the service quality level, and notifies a measurement-period acquisition unit of the change. The measurement-period acquisition unit acquires from the measurement-period holding unit a value of the measurement period corresponding to the change. A delay-profile measurement unit repeats the measurement of the delay profiles with the measurement period determined by the acquired value.
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Citations
12 Claims
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1. A communication device for performing wireless communication, comprising:
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a measurement-period holding unit which holds for measurement of delay profiles values of a measurement period in correspondence with values indicating one or a combination of a wireless condition or a service quality level;
a change recognition unit which recognizes a change in at least one of the wireless condition and the service quality level, and notifies a measurement-period acquisition unit of the change;
said measurement-period acquisition unit which acquires from said measurement-period holding unit a value of the measurement period corresponding to said change of which the measurement-period acquisition unit is notified by the change recognition unit; and
a delay-profile measurement unit which repeats the measurement of the delay profiles with the measurement period determined by said value acquired by the said measurement-period acquisition unit during a time which is necessary and appropriate for the measurement. - View Dependent Claims (2, 3, 4)
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5. A communication device for performing wireless communication, comprising:
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a measurement-time holding unit which holds for measurement of delay profiles values of a measurement time in correspondence with values indicating one or a combination of a wireless condition or a service quality level;
a change recognition unit which recognizes a change in at least one of the wireless condition and the service quality level, and notifies a measurement-time acquisition unit of the change;
said measurement-time acquisition unit which acquires from said measurement-period holding unit a value of the measurement time corresponding to said change of which the measurement-time acquisition unit is notified by the change recognition unit; and
a delay-profile measurement unit which performs the measurement of the delay profiles for the measurement time determined by said value acquired by the said measurement-time acquisition unit, within a time which is necessary and appropriate for the measurement. - View Dependent Claims (6, 7, 8)
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9. A method for measuring delay profiles, comprising the steps of:
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(a) holding for measurement of the delay profiles values of a measurement period in correspondence with values indicating one or a combination of the number of spreading codes with which the delay profiles are to be measured and a measurement time which is determined for the measurement of the delay profiles according to reception quality;
(b) recognizing a change in at least one of the number of spreading codes and the measurement time;
(c) changing said measurement period according to said change; and
(d) repeating the measurement of the delay profiles with the changed measurement period within a time which is necessary and appropriate for the measurement.
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10. A method for measuring delay profiles, comprising the steps of:
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(a) holding for measurement of the delay profiles values of a measurement time in correspondence with values indicating one or a combination of the number of spreading codes with which the delay profiles are to be measured and a measurement period which is determined for the measurement of the delay profiles according to reception quality;
(b) recognizing a change in at least one of the number of spreading codes and the measurement period;
(c) changing said measurement time according to said change; and
(d) performing the measurement of the delay profiles with the changed measurement time within a time which is necessary and appropriate for the measurement.
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11. A receiver receiving spread-spectrum wireless signals, and having a function of generating, as information on delay profiles, information on correlation between received signals and spreading codes for detection of timings of delayed waves, wherein:
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when there are a plurality of spreading codes with which the information on the delay profiles is to be generated, said function sets each of the plurality of spreading codes in succession in a correlation detection unit which is provided for measuring the correlations, and detection of the correlations with each of the plurality of spreading codes is repeated with a predetermined period; and
said receiver comprises an updating unit which increases said predetermined period when the number of the plurality of spreading codes increases, or when a measurement time in which each of the correlations is measured with each of the plurality of spreading codes increases.
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12. A receiver for receiving spread-spectrum wireless signals, and generating delay profiles which indicate timings of delayed portions of the spread-spectrum wireless signals, comprising:
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a correlation detection unit which holds in succession each of a plurality of spreading codes which are used for generating the delay profiles, obtains correlations between the spread-spectrum wireless signals and the plurality of spreading codes by measurement repeated with a measurement period which-is predetermined for each of the plurality of spreading codes, and generates the delay profiles based on the correlations; and
a measurement-period change unit which increases said measurement period when the number of the plurality of spreading codes increases, or when a measurement time in which each of the correlations is obtained by measurement with each of the plurality of spreading codes increases.
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Specification