Mobile communication system, communication control method, and base station and mobile station to be employed in the same

Abstract

In the communication system performing transmission with generating the vacant period in the slotted mode during data transmission in order to perform various process, such as different frequency carrier quality measurement or so forth, the control signal for maintaining a communication quality is inserted even in the vacant period. Therefor, a link quality may not be degraded even if the vacant period is long. Namely, when the pilot signal is used as the control signal, even in the vacant period, measurement of the link quality of the forward link with the pilot signal is performed in the mobile station to report the result of measurement to the base station. Therefore, transmission power control of the forward link can be performed according to the report in the base station. Therefore, degradation of the forward link can be eliminated.

1 . A communication control method comprising:
 providing a vacant period, in which no communication data is present, in a data transmission from a base station to a mobile station;   inserting a first pilot signal, such that a beginning of the first pilot signal is contiguous with an end of a data transmission prior to the vacant period;   inserting a second pilot signal, such that an end of the second pilot signal is contiguous with a beginning of a data transmission after the vacant period; and   performing inter-frequency measurement during the vacant period.   
     
     
         2 . The communication control method according to  claim 1 , wherein the inter-frequency measurement during the vacant period is performed by the mobile station. 
     
     
         3 . A communication control method comprising:
 providing a vacant period, in which no communication data is present, in a data transmission from a base station to a mobile station;   inserting a first pilot signal, such that an end of the first pilot signal is contiguous with a beginning of a data transmission prior to the vacant period; and   performing inter-frequency measurement during the vacant period;   wherein a second pilot signal is present within a data transmission prior to the vacant period, such that an end of the second pilot signal is contiguous with a beginning of the vacant period.   
     
     
         4 . A communication control method comprising:
 providing a vacant period, in which no communication data is present, in a data transmission from a base station to a mobile station;   inserting a pilot signal, such that an end of the pilot signal is contiguous with a beginning of a data transmission after the vacant period; and   performing inter-frequency measurement during the vacant period;   wherein the inter-frequency measurement during the vacant period is performed by the mobile station.   
     
     
         5 . A communication control method comprising:
 transmitting a data transmission from a base station to a mobile station, the data transmission comprising a series of time slots, wherein a predetermined signal pattern is repeated in each time slot;   providing a vacant period in the data transmission;   inserting a pilot signal, such that an end of the pilot signal is contiguous with a beginning of a data transmission in a time slot after the vacant period; and   performing inter-frequency measurement during the vacant period; wherein the predetermined signal pattern of each time slot comprises a pilot signal present within an end of each time slot, such that a time slot prior to the vacant period includes a pilot signal having an en d contiguous with a beginning of the vacant period.   
     
     
         6 . A communication control system comprising:
 a base station comprising:   a first circuit which provides a vacant period, in which no communication data is present, in a data transmission from the base station to a mobile station and   a second circuit which inserts a first pilot signal, such that a beginning of the first pilot signal is contiguous with an end of a data transmission prior to the vacant period, and which inserts a second pilot signal, such that an end of the second pilot signal is contiguous with a beginning of a data transmission after the vacant period; and   a mobile station comprising:   a circuit which performs inter-frequency measurement during the vacant period.   
     
     
         7 . A communication control system comprising: a base station comprising:
 a first circuit which provides a vacant period, in which no communication data is present, in a data transmission from the base station to a mobile station and   a second circuit which inserts a first pilot signal, such that an end of the first pilot signal is contiguous with a beginning of a data transmission after the vacant period; and   a mobile station comprising:   a circuit which performs inter-frequency measurement during the vacant period;   wherein a second pilot signal is present within a data transmission prior to the vacant period, such that an end of the second pilot signal is contiguous with a beginning of the vacant period.   
     
     
         8 . A communication control system comprising: a base station comprising:
 a first circuit which transmits a data transmission from the base station to a mobile station, the data transmission comprising a series of time slots, wherein a predetermined signal pattern is repeated in each time slot;   a second circuit which provides a vacant period, in which no communication data is present, in the data transmission;   a third circuit which inserts a pilot signal, such that an end of the pilot signal is contiguous with a beginning of a data transmission in time slot after the vacant period; and   a mobile station comprising:   a circuit which inserts a pilot signal, such that an end of the pilot   signal is contiguous with a beginning of a data transmission in a time slot after the vacant period; and   a mobile station comprising:   a circuit which performs inter-frequency measurement during the vacant period;   wherein the predetermined signal pattern of each time slot comprises a pilot signal present within an end of each time slot, such that a time slot prior to the vacant period includes a pilot signal having an end contiguous with a beginning of the vacant period.   
     
     
         9 . A communication control system comprising: a base station comprising:
 means for providing a vacant period, in which no communication data is present, in a data transmission from the base station to a mobile station and   means for inserting a first pilot signal, such that a beginning of the first pilot signal is contiguous with an end of a data transmission prior to the vacant period, and for inserting a second pilot signal, such that an end of the second pilot is contiguous with a beginning of a data transmission after the vacant period; and   a mobile station comprising:   means for performing inter-frequency measurement during the vacant period.   
     
     
         10 . A communication control system comprising: a base station comprising:
 means for providing a vacant period, in which no communication data is present, in a data transmission from the base station to a mobile station and   means for inserting a first pilot signal, such that an end of the first pilot signal is contiguous with a beginning of data transmission after the vacant period; and   a mobile station comprising:   means for performing inter-frequency measurement during the vacant period;   wherein a second pilot is present within a data transmission prior to the vacant period, such that an end of the second pilot is contiguous with a beginning of the vacant period.   
     
     
         11 . A communication control system comprising: a base station comprising:
 means for transmitting a data transmission from the base station to a mobile station, the data transmission comprising a series of time slots, wherein a predetermined signal pattern is repeated in each time slot;   means for providing a vacant period, in which no communication data is present, in the data transmission;   means for inserting a pilot signal, such that an end of the pilot sign at is contiguous with a beginning of a data transmission in a time slot after the vacant period; and   a mobile station comprising:   means for performing inter-frequency measurement during the vacant period;   wherein the predetermined signal pattern of each time slot comprises a pilot signal present within an end of each time slot, such that a time slot prior to the vacant period includes a pilot signal having an end contiguous with a beginning of the vacant period.   
     
     
         12 . A mobile station, comprising:
 a transmission and reception circuit which receives data transmissions from a base station;   wherein at least one of the received data transmissions includes:   a vacant period in which no communication data is present, in a stream of communication data from a base station to the mobile station;   a first pilot signal inserted such that a beginning of the first pilot signal is contiguous with an end of data transmission prior to the vacant period; and   a second pilot signal inserted such that an end of the second pilot signal is contiguous with a beginning of data transmission after the vacant period,   a circuit which performs inter-frequency measurement during the vacant period.   
     
     
         13 . A mobile station, comprising:
 a transmission and reception circuit which receives data transmissions from a base station;   wherein at least one of the received data transmissions includes:   a vacant period in which no communication data is present, in a stream of communication data from a base station to the mobile station;   a first pilot signal inserted such that an end of the first pilot signal is contiguous with a beginning of data transmission after the vacant period; and   a second pilot signal within data transmission prior to the vacant period such that an end of the second pilot signal is contiguous with a beginning of the vacant period,   a circuit which performs inter-frequency measurement during the vacant period.   
     
     
         14 . A mobile station, comprising:
 a transmission and reception circuit which receives data transmissions from a base station;   wherein at least one of the received data transmissions includes:   a vacant period in which no communication data is present, in a stream of communication data from a base station to the mobile station; and   a pilot signal inserted such that an end of the pilot signal is contiguous with a beginning of data transmission after the vacant period,   a circuit which performs inter-frequency measurement during the vacant period.   
     
     
         15 . A mobile station, comprising:
 a transmission and reception circuit which receives data transmissions from a base station to a mobile station, the data transmission comprising a series of time slots, wherein a predetermined signal pattern is repeated in each time slot;   wherein at least one of the received data transmissions includes:   a vacant period in which no communication data is present, in a stream of communication data from a base station to the mobile station; and   a pilot signal inserted such that an end of the pilot signal is contiguous with a beginning of data transmission after the vacant period,   a circuit which performs inter-frequency measurement during the vacant period,   wherein the predetermined signal pattern of each time slot comprises a pilot signal present within an end of each time slot, such that a time slot prior to the vacant period includes a pilot signal having an end contiguous with a beginning of the vacant period.