IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0346784
(1999-07-07)
|
발명자
/ 주소 |
- Czaja, Stanislaw
- Jones, William
- Kenney, Thomas
- Anderson, Kraig
|
출원인 / 주소 |
- Infineon Technologies North America Corp.
- LSI Logic Corporation
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
17 인용 특허 :
13 |
초록
▼
The present invention a system and method are provided for performing an inter-frequency search with reduced loss of link frames in a CDMA system. The CDMA system includes a base station (20) and a mobile station (50). The mobile station (50) has a searcher (164), which searches for pilot channels.
The present invention a system and method are provided for performing an inter-frequency search with reduced loss of link frames in a CDMA system. The CDMA system includes a base station (20) and a mobile station (50). The mobile station (50) has a searcher (164), which searches for pilot channels. The signal strengths of these pilot channels are then reported to the base station (20). This searching results in erased portions of a data frame (238). After the signal strengths are reported to the base station (20), the mobile station (50) informs the base station (20) of the parameters related to the search. These parameters may include the frame of the search, the start position of the search, and the length of the search. The mobile station (50) and the base station (20) then replaces the erased portions of the frame with corrective data such as soft zeros.
대표청구항
▼
1. A method for inter-frequency search by a mobile station in a wireless communication system, the method comprising:in the mobile station receiving a forward link signal carrying forward communication data from a first base station on a first frequency; at the mobile station, setting at least one t
1. A method for inter-frequency search by a mobile station in a wireless communication system, the method comprising:in the mobile station receiving a forward link signal carrying forward communication data from a first base station on a first frequency; at the mobile station, setting at least one timing parameter that sets a start time and a duration of an inter-frequency search that will be performed by the mobile station; transmitting the at least one timing parameter of the inter-frequency search to the first base station using a reverse link signal carrying reverse communication data from the mobile station; tuning the mobile station to a candidate frequency other than the first frequency during the inter-frequency search having the start the and the duration set by the at least one timing parameter, the inter-frequency search causing the mobile station to lose data both in the forward link signal from the first base station ard in the reverse link signal to the first base station; using the at least one turning parameter to determine from which portions of forward and reverse communication data is data lost due to the inter-frequency search; in the, first base station replacing the determined portion of reverse communication data with predefined data, so that data that is lost from the reverse link signal is replaced with the predefined data; and in the mobile station, replacing the determined portion of forward communication data with predefined data, so that data that is lost from the forward link signal is replaced with the predefined data. 2. The method of claim 1, wherein transmitting the at least one timing parameter to the first base station comprises:transmitting the at least one timing parameter to the first base station in a candidate frequency search position message. 3. The method of claim 2, wherein transmitting the at least one timing parameter to the first base station in a candidate frequency search position message comprises:transmitting the at least one timing parameter to the first base station in a candidate frequency search position message that is placed in at least one of a reverse dedicated control channel and a reverse common control channel. 4. The method of claim 1, further comprising:in the mobile station, receiving a request for the inter-frequency search from the first base station. 5. The method of claim 1, further comprising:in the mobile station, measuring a signal strength of a second base station while the mobile station is tuned to the candidate frequency. 6. The method of claim 5, further comprising:reporting the measured signal strength to the first base station. 7. The method of claim 1, wherein replacing the determined portion of forward communication data with predefined data comprises:replacing the determined portion of forward communication data with soft zeros. 8. The method of claim 1, wherein setting at least one timing parameter comprises:setting a frame, a start position within the frame to set the start time of the inter-frequency search, and a length within the frame to set the duration of the inter-frequency search. 9. The method of claim 8, wherein setting the start position of the inter-frequency search comprises:defining the start position of the inter-frequency search in power control group units. 10. The method of claim 9, wherein defining the start position comprises:defining the start position of the inter-frequency search in power control group units, wherein one power control group unit is 1.25 ms. 11. The method of claim 1, wherein setting the at least one timing parameter comprises:setting the at least one timing parameter such that the mobile station will perform the inter-frequency search when speech activity rate drops to a low rate. 12. The method of claim 11, further comprising:in the mobile station, monitoring the speech activity rate. 13. The method of claim 11, further comprising:in the mobile station, lowering data rate on a reverse supplemental channel to match speech activity rate on a reverse fundamental channel. 14. The method of claim 13, further comprising:sending a rate message to the first base station, the rate message notifying the first base station of future lowering of data rate on the reverse supplemental channel. 15. The method of claim 14, further comprising:in the first base station, determining a data rate on the reverse fundamental channel, and using the determined data rate to identify data rate on the reverse supplemental channel. 16. A method for inter-frequency search by a mobile station communicating with a first base station in a wireless communication system, the method comprising:at the first base station, receiving a reverse link signal carrying reverse communication data from the mobile station on a first frequency; at the mobil station setting at least one timing parameter that sets a start time and a duration of an inter-frequency search that includes tuning the mobile station to a candidate frequency other than the first frequency, the inter-frequency search causing a data loss in the reverse link signal; transmitting the at least one timing parameter of the inter-frequency search to the first base station using the reverse link signal; using the at least one timing parameter to determine from which portion of reverse communication data is data lost due to the inter-frequency search; and in the first base station, replacing the determined portion of reverse communication data with predefined data, so that data that is lost from the reverse link signal is replaced with the predefined data. 17. The method of claim 16, further comprising:in the mobile station, receiving a forward link signal carrying forward communication data from the first base station, the inter-frequency search causing the mobile station to lose data in the forward link signal from the first base station; in the mobile station, replacing a portion of forward communication data with predefined data so that data that is lost from the forward link signal is replaced with the predefined data, the replaced portion of forward communication being determined using the at least one timing parameter of the inter-frequency search. 18. The method of claim 16, further comprising:transmitting a request for the inter-frequency search to the mobile station. 19. The method of claim 18, further comprising:in the first base station, determining data rate on a reverse supplemental channel after transmitting the request for the inter-frequency search from the mobile station. 20. The method of claim 16, further comprising:at the first base station, receiving a measured signal strength of a second base station, the measured signal strength being transmitted by the mobile station. 21. The method of claim 16, wherein replacing the determined portion of reverse communication data with predefined data comprises:replacing the determined portion of reverse communication data with soft zeros. 22. The method of claim 16, wherein setting at least one timing parameter comprises:setting a frame and a start position within the frame to set the start time of the inter-frequency search, and a length within the frame to set the duration of the inter-frequency search. 23. A wireless communication system comprising: a mobile station configuredto communicate in the wireless communication system using a forward link signal and a reverse link signal on a first frequency; to set the at least one timing parameter; to transmit the at least one timing parameter to the first base station, and to perform an inter-frequency search having a start time and a duration that are set by at least one timing parameter, wherein the inter-frequency search includes tuning the mobile station to a candidate frequency other than the first frequency, the inter-frequency search causing the mobile station to lose communication data in the forward and reverse link signals; and a first base station configured to receive the reverse link signal from the mobile station on the first frequency; to receive the at least one timing parameter from the mobile station; and to replace a portion of reverse communication data that is determined using the at least one timing parameter of the interfrequency search with predefined data, so that data that is lost from the reverse link signal is replaced with predefined data. 24. The wireless communication system of claim 23, wherein the mobile station is configuredto replace a portion of forward communication data with predefined data so that data that is lost from the forward link signal is replaced by the predefined data, wherein the portion of forward communication data is determined using the at least one timing parameter. 25. The wireless communication system of claim 23, wherein the first base station is configured to replace the portion of reverse communication data with soft zeros.26. The wireless communication system of claim 23 wherein the mobile station is configured to perform an inter-frequency search having a pre-set start time and a pre-set duration, the pre-set start time being defined by a fame of the inter-frequency search and a start position within the frame, and the preset duration being defined by a length within the frame.27. A method for inter-frequency search by a mobile station in a wireless communication system, the method comprising:in the mobile station, receiving a forward link signal carrying forward communication data from a first base station on a first frequency; in the mobile station, setting at least one timing parameter that sets a start time and a duration of an inter-frequency search that will be performed by the mobile station; transmitting the at least one timing parameter to the first base station using a reverse link signal carrying reverse communication data from the mobile station; timing the mobile station to a candidate frequency other than the first frequency during the inter-frequency search having the start time and the duration set by the at least one timing parameter, the inter-frequency search causing data loss in the forward and reverse link signals; in the mobile station, replacing a portion of forward communication data with predefined data, the replaced portion of forward communication data being determined using the at least one timing parameter of the inter-frequency search so that data that is lost from the forward link signal is replaced with the predefined data; and in the first base station, replacing a portion of reverse communication data with predefined data, the replaced portion of reverse communication data being determined using the at least one timing parameter of the inter-frequency search so that data that is lost from the reverse link signal is replaced with the predefined data.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.