IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0597673
(2008-04-25)
|
등록번호 |
US-8374099
(2013-02-12)
|
우선권정보 |
JP-2007-118385 (2007-04-27) |
국제출원번호 |
PCT/JP2008/058034
(2008-04-25)
|
§371/§102 date |
20091026
(20091026)
|
국제공개번호 |
WO2008/136390
(2008-11-13)
|
발명자
/ 주소 |
- Hamabe, Kojiro
- Lee, Jinsock
|
출원인 / 주소 |
|
인용정보 |
피인용 횟수 :
0 인용 특허 :
6 |
초록
▼
A base station (2) receives paging information for a mobile station (8) from gateway device (1), transmits the paging information after changing the amount of the radio resource of a paging channel, and measures a statistic associated with the completion of communication processing including at leas
A base station (2) receives paging information for a mobile station (8) from gateway device (1), transmits the paging information after changing the amount of the radio resource of a paging channel, and measures a statistic associated with the completion of communication processing including at least a response of the paging information. The base station (2) then calculates a reception error rate of the paging information, based on the statistic. When receiving the paging information, the mobile station (8) transmits a response signal to the base station (8).
대표청구항
▼
1. A communication system configured of a gateway device, at least one base station or more, and at least one mobile station or more, wherein: said base station comprises:a measurement unit for receiving predetermined information associate with said mobile station from said gateway device, changing
1. A communication system configured of a gateway device, at least one base station or more, and at least one mobile station or more, wherein: said base station comprises:a measurement unit for receiving predetermined information associate with said mobile station from said gateway device, changing a radio resource amount being employed for transmitting said predetermined information, transmitting said predetermined information to the mobile station, and measuring statistics associate with completion of a communication process including at least a response to said predetermined information; anda reception error ratio calculator for calculating a reception error ratio of said predetermined information based upon said statistics; andsaid mobile station comprises an information response unit for, when receiving said predetermined information, transmitting a response signal to said base station,wherein said predetermined information is paging information,wherein:said measurement unit comprises:a paging information transmission power control unit for transmitting the paging information at a predetermined probability by employing a current transmission power, a transmission power smaller than said current transmission power, and a transmission power larger than said current transmission power; anda response number-of-times measurement unit for measuring a number of times of the responses to the paging information at each transmission power; andsaid reception error ratio calculation unit comprises a paging information reception error ratio calculation unit for, based upon said number of times of the responses to the paging information at each transmission power, calculating one of a reception error ratio of the paging information at the time of the current transmission power, and a reception error ratio of the paging information at the time of the transmission power smaller than said current transmission power, or both,wherein: said response number-of-times measurement unit measures a number of times Npage of the transmission of the paging information at the current transmission power, a number of times Nres of the reception of the responses to the above transmission of the paging information, a number of times Npage_high of the transmission of the paging information at the transmission power higher than the current transmission power, a number of times Nres_high of the reception of the responses to the above transmission of the paging information, a number of times Npage_low of the transmission of the paging information at the transmission power lower than the current transmission power, and a number of times Nres_low of the reception of the responses to the above transmission of the paging information: andsaid paging information reception error ratio calculator:calculates a response probability Pres_current that the response to the paging information at the current transmission power is made from Pres_current=Nres/Npage;calculates a response probability Pres_low that the response to the paging information at the transmission power lower than the current transmission power is made from Pres_low=Nres_low/Npage_low;calculates a response probability Pres_high that the response to the paging information at the transmission power higher than the current transmission power is made from Pres_high=Nres_high/Npage_high;calculates a reception error ratio Perr of the paging information at the time of the current transmission power from Perr=1−Pres_current/Pres_high; andcalculates a reception error ratio Perr_low of the paging information at the transmission power lower than the current transmission power from Perr_low=1−Pres_low/Pres_high. 2. A communication system according to claim 1, wherein said radio resource controller takes a control so as to: compare the reception error ratio Perr of the paging information at the time of the current transmission power with a predetermined error ratio;raise the transmission power of the paging channel to a level higher than the current transmission power within a permissible range when said reception error ratio Perr is larger than the predetermined error ratio;compare the reception error ratio Perr_low of the paging information at the transmission power lower than the current transmission power with a predetermined error ratio when said Perr is smaller than the predetermined error ratio; andlower the transmission power of the paging channel to a level lower than the current transmission power within a permissible range when said Perr_low is smaller than the predetermined error ratio. 3. A base station in a communication system, comprising: a measurement unit for changing a radio resource amount being employed for transmitting predetermined information, transmitting said predetermined information to a mobile station, and measuring statistics associate with completion of a communication process including at least a response to said predetermined information; anda reception error ratio calculator for calculating a reception error ratio of said predetermined information based upon said statistics,wherein said predetermined information is paging information,wherein:said measurement unit comprises:a paging information transmission power controller for transmitting the paging information by employing a current transmission power, a transmission power smaller than said current transmission power, and a transmission power larger than said current transmission power at a predetermined probability; anda response number-of-times measurement unit for measuring a number of times of the responses to the paging information at each transmission power; andsaid reception error ratio calculator comprises a paging information reception error ratio calculator for, based upon said number of times of the responses to the paging information at each transmission power, calculating one of a reception error ratio of the paging information at the time of the current transmission power, and a reception error ratio of the paging information at the time of the transmission power smaller than said current transmission power, or both,wherein:said response number-of-times measurement unit measures a number of times Npage of the transmission of the paging information at the current transmission power, a number of times Nres of the reception of the responses to the above transmission of the paging information, a number of times Npage_high of the transmission of the paging information at a transmission power higher than the current transmission power, a number of times Nres_high of the reception of the responses to the above transmission of the paging information, a number of times Npage_low of the transmission of the paging information at a transmission power lower than the current transmission power, and a number of times Nres_low of the reception of the responses to the above transmission of the paging information: andsaid paging information reception error ratio calculator:calculates a response probability Pres_current that the response to the paging information at the current transmission power is made from Pres_current=Nres/Npage;calculates a response probability Pres_low that the response to the paging information at the transmission power lower than the current transmission power is made from Pres_low=Nres_low/Npage_low;calculates a response probability Pres_high that the response to the paging information at the transmission power higher than the current transmission power is made from Pres_high=Nres_high/Npage_high;calculates a reception error ratio Perr of the paging information at the time of the current transmission power from Perr=1−Pres_current/Pres_high; andcalculates a reception error ratio Perr_low of the paging information at the transmission power lower than the current transmission power from Perr_low=1−Pres_low/Pres_high. 4. A base station according to claim 3, wherein said radio resource controller takes a control so as to: compare the reception error ratio Perr of the paging information at the time of the current transmission power with a predetermined error ratio;raise the transmission power of the paging channel to a level higher than the current transmission power within a permissible range when said reception error ratio Perr is larger than the predetermined error ratio;compare the reception error ratio Perr_low of the paging information at the transmission power lower than the current transmission power with a predetermined error ratio when said Perr is smaller than the predetermined error ratio; andlower the transmission power of the paging channel to a level lower than the current transmission power within a permissible range when said Perr_low is smaller than the predetermined error ratio.
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