Radio communication system
First Claim
Patent Images
1. A radio communication system comprising:
- a plurality of communication units in a radio network, wherein one of the plurality of communication units is a master and operates in a master mode and other communication units are slaves and operate in a slave mode,wherein a transition into a Sniff mode is allowed during operation in the slave mode,wherein each of the plurality of communication units includes a battery as driving power,wherein each slave in the Sniff mode communicates with the master during a Sniff duration in every Sniff period, and each Sniff duration includes two or more Sniff slots,wherein the communication unit operating in the master mode stops transmission/reception operations in synchronization with all slaves in the Sniff mode which are out of the Sniff duration, andwherein the Sniff periods of the communication units operating in the slave mode are substantially in synchronization and in phase with each other or out of chase with each other.
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Abstract
The present invention provides a radio communication system in which not only a communication unit operating in a slave mode but also a communication unit operating in a master mode can be changed into a power saving mode.
Among a plurality of communication units, one of them is operating in the master mode while the others are operating in the slave mode. Only the communication units operating in the slave mode are allowed to be changed into a suspend state. The communication unit operating in the master mode stops transmission/reception in synchronization with transition into the stop state of the communication units operating in the slave mode.
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Citations
21 Claims
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1. A radio communication system comprising:
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a plurality of communication units in a radio network, wherein one of the plurality of communication units is a master and operates in a master mode and other communication units are slaves and operate in a slave mode, wherein a transition into a Sniff mode is allowed during operation in the slave mode, wherein each of the plurality of communication units includes a battery as driving power, wherein each slave in the Sniff mode communicates with the master during a Sniff duration in every Sniff period, and each Sniff duration includes two or more Sniff slots, wherein the communication unit operating in the master mode stops transmission/reception operations in synchronization with all slaves in the Sniff mode which are out of the Sniff duration, and wherein the Sniff periods of the communication units operating in the slave mode are substantially in synchronization and in phase with each other or out of chase with each other. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A radio communication system comprising:
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a plurality of communication units in a radio network, wherein one of the plurality of communication units is a master and operates in a master mode and other communication units are slaves and operate in a slave mode, wherein a transition into a power saving mode is allowed during operation in the slave mode and a transition into the power saving mode is forbidden during operation in the master mode, wherein each of the plurality of communication units includes a battery as driving power, wherein each slave in the power saving mode communicates with the master periodically during a communication duration, and wherein each of the communication units comprises; means for calculating a cumulative time of operating in the master mode; and means for exchanging information about the cumulative time with other communication units, wherein the master mode is assigned to one of the plurality of communication units of which the cumulative time is relatively short, wherein the communication unit operating in the master mode switches roles with the communication unit having the shortest cumulative time when the cumulative time of the communication unit operating in the master mode is longer than the shortest cumulative time among the exchanged cumulative times by at least a predetermined switching reference time. - View Dependent Claims (14, 15)
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16. A radio communication system comprising:
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a plurality of communication units in a radio network, wherein one of the plurality of communication units is a master and operates in a master mode and other communication units are slaves and operate in a slave mode, wherein a transition into a power saving mode is allowed during operation in the slave mode and a transition into the power saving mode is forbidden during operation in the master mode, wherein each of the plurality of communication units includes a battery as driving power, wherein each slave in the power saving mode communicates with the master periodically during a communication duration, and wherein each of the communication units comprises; means for calculating a cumulative time of operating in power saving mode; and means for exchanging information about the cumulative time with other communication units, wherein the master mode is assigned to one of the plurality of communication units of which the cumulative time is relatively long wherein the communication unit operating in the master mode switches roles with the communication unit having the longest cumulative time when the longest cumulative time among the exchanged cumulative times is longer than the cumulative time of the communication unit operating in the master mode by at least a predetermined switching reference time. - View Dependent Claims (17, 18)
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19. A radio communication system comprising:
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a plurality of communication units in a radio network, wherein one of the plurality of communication units is a master and operates in a master mode and other communication units are slaves and operate in a slave mode, wherein a transition into a power saving mode is allowed during operation in the slave mode, wherein each slave in the power saving mode communicates with the master periodically during a communication duration, wherein the communication unit operating in the master mode stops transmission/reception operations in synchronization with all slaves in the power saving mode which are out of the communication duration, and wherein each of the communication units comprises; means for calculating a cumulative time of operating in the power saving mode; and means for exchanging information about the cumulative time with other communication units, and wherein the communication unit operating in the master mode switches roles with the communication unit having the longest cumulative time when the longest cumulative time among the exchanged cumulative times is longer than the cumulative time of the communication unit operating in the master mode by at least a predetermined switching reference time. - View Dependent Claims (20, 21)
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Specification