Communication device
First Claim
1. A communication device that is one of a plurality of communication devices used in a mobile communication system,the communication devices performing direct wireless communication using a control channel and a service channel among communication channels that are achieved with mutually different frequencies, wherein two communication time zones of a control channel time zone and a service channel time zone are alternately switched, the control channel time zone where communication is performed using the control channel, the service channel time zone where communication is performed using the service channel,the communication device comprising:
- a time holder section that holds a clock time at present based on a clock signal outputted successively from a clock generator;
a synchronization information acquirer section that acquires synchronization information used to synchronize the clock time held in the time holder section with a predetermined reference clock time;
a time amender section that performs amendment that amends the clock time held in the time holder section to decrease an error between the clock time held in the time holder section and the reference clock time based on the synchronization information;
a time zone determiner section that identifies a switching point of time at which the communication time zones are switched based on the clock time held in the time holder section, while determining whether the communication time zones are switched based on the switching point of time and the clock time held in the time holder section;
a channel switching section that designates a communication-target channel being a channel for a communication target by switching the communication time zones at the switching time identified by the time zone determiner section;
a transmission processor section that performs a data transmission using the communication-target channel designated by the channel switching section, andprohibits data transmission from being performed for a predetermined transmission prohibition duration time before and after the switching point of time;
an error assessor section that assesses an error amount being a degree of the error between the clock time held in the time holder section and the reference clock time; and
a transmission prohibition-time adjuster section that adjusts the transmission prohibition duration time depending on the error amount assessed by the error assessor section,whereinthe transmission prohibition-time adjuster section increases the transmission prohibition duration time as the error amount assessed by the error assessor section increases.
1 Assignment
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Accused Products
Abstract
A communication device includes: a time zone determiner section that identifies a switching point of time of communication time zones based on a clock time and determines whether the communication time zones are switched based on the clock time and the switching point of time; a channel switch section that designates a communication-target channel by switching the communication time zones at the identified switching point of time; a transmission processor section that performs a data transmission using the communication-target channel designated, and prohibits data transmission from being performed for a predetermined transmission prohibition duration time before and after the switching point of time; an error assessor section that assesses an error amount that is a degree of an error of the clock time against the reference clock time; and a transmission prohibition-time adjuster section that increases the transmission prohibition duration time as the error amount increases.
10 Citations
13 Claims
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1. A communication device that is one of a plurality of communication devices used in a mobile communication system,
the communication devices performing direct wireless communication using a control channel and a service channel among communication channels that are achieved with mutually different frequencies, wherein two communication time zones of a control channel time zone and a service channel time zone are alternately switched, the control channel time zone where communication is performed using the control channel, the service channel time zone where communication is performed using the service channel, the communication device comprising: -
a time holder section that holds a clock time at present based on a clock signal outputted successively from a clock generator; a synchronization information acquirer section that acquires synchronization information used to synchronize the clock time held in the time holder section with a predetermined reference clock time; a time amender section that performs amendment that amends the clock time held in the time holder section to decrease an error between the clock time held in the time holder section and the reference clock time based on the synchronization information; a time zone determiner section that identifies a switching point of time at which the communication time zones are switched based on the clock time held in the time holder section, while determining whether the communication time zones are switched based on the switching point of time and the clock time held in the time holder section; a channel switching section that designates a communication-target channel being a channel for a communication target by switching the communication time zones at the switching time identified by the time zone determiner section; a transmission processor section that performs a data transmission using the communication-target channel designated by the channel switching section, and prohibits data transmission from being performed for a predetermined transmission prohibition duration time before and after the switching point of time; an error assessor section that assesses an error amount being a degree of the error between the clock time held in the time holder section and the reference clock time; and a transmission prohibition-time adjuster section that adjusts the transmission prohibition duration time depending on the error amount assessed by the error assessor section, wherein the transmission prohibition-time adjuster section increases the transmission prohibition duration time as the error amount assessed by the error assessor section increases. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A communication device that is one of a plurality of communication devices used in a mobile communication system,
the communication devices performing direct wireless communication using a control channel and a service channel among communication channels that are achieved with mutually different frequencies, wherein two communication time zones of a control channel time zone and a service channel time zone are alternately switched, the control channel time zone where communication is performed using the control channel, the service channel time zone where communication is performed using the service channel, the communication device comprising at least one communication control circuit that: -
holds a clock time at present based on a clock signal outputted successively from a clock generator unit; acquires synchronization information used to synchronize the held clock time with a predetermined reference clock time; performs amendment that amends the held clock time to decrease an error between the held clock time and the reference clock time based on the synchronization information; identifies a switching point of time at which the communication time zones are switched based on the held clock time, and determines whether the communication time zones are switched based on the switching point of time and the held clock time; designates a communication-target channel being a channel for a communication target by switching the communication time zones at the switching time identified; performs a data transmission using the designated communication-target channel, while prohibiting data transmission from being performed for a predetermined transmission prohibition duration time before and after the switching point of time; assesses an error amount being a degree of the error between the held clock time and the reference clock time; and adjusts the transmission prohibition duration time depending on the error amount assessed, wherein the communication control circuit increases the transmission prohibition duration time as the assessed error amount increases. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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Specification