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| 국가/구분 | United States(US) Patent 등록 |
|---|---|
| 국제특허분류(IPC7판) |
|
| 출원번호 | US-0702029 (1991-05-17) |
| 발명자 / 주소 |
|
| 출원인 / 주소 |
|
| 인용정보 | 피인용 횟수 : 353 인용 특허 : 0 |
A power control system for a cellular mobile telephone system in which system users communicate information signals between one another via at least one cell site using code division multiple access spread spectrum communication signals. The power control system controls transmission signal power fo
A power control system for a cellular mobile telephone system in which system users communicate information signals between one another via at least one cell site using code division multiple access spread spectrum communication signals. The power control system controls transmission signal power for each cellular mobile telephone in the cellular mobile telephone system wherein each cellular mobile telephone has an antenna, transmitter and receiver and each cell-site also has an antenna, transmitter and receiver. Cell-site transmitted signal power is measured as received at the mobile unit. Transmitter power is adjusted at the mobile unit in an opposite manner with respect to increases and decreases in received signal power. A power control feedback scheme may also be utilized. At the cell-site communicating with the mobile unit, the mobile unit transmitted power is measured as received at the cell-site. A command signal is generated at the cell-site and transmitted to the mobile unit for further adjusting mobile unit transmitter power corresponding to deviations in the cell site received signal power. The feedback scheme is used to further adjust the mobile unit transmitter power so that mobile unit transmitted signals arrive at the cell-site at a desired power level. In a cell diversity situation, the mobile units transmitter power is adjusted to prevent unnecessary increases in mobile unit transmitter power level.
In a cellular mobile telephone system in which system users communicate information signals between one another via multiple cell-sites using code division multiple access (CDMA) spread spectrum communication signals, a power control system for controlling transmission signal power for each mobile t
In a cellular mobile telephone system in which system users communicate information signals between one another via multiple cell-sites using code division multiple access (CDMA) spread spectrum communication signals, a power control system for controlling transmission signal power for each mobile telephone in said cellular mobile telephone system, wherein each mobile telephone has an antenna, transmitter and a receiver system and each cell-site has an antenna, at least one transmitter and at least one receiver, said power control system comprising: first power measurement means, coupled to a mobile telephone receiver system, for measuring signal power in CDMA communication signals received by said mobile telephone receiver system; first power adjustment means, coupled to a mobile telephone transmitter and corresponding mobile telephone first power measurement means, said first power adjustment means responsive to decreases and increases in power measurements of said corresponding first power measurement means with respect to a first predetermined power level, for respectively increasing and decreasing transmission signal power of said corresponding mobile telephone transmitter; a plurality of second power measurement means, each coupled to a respective cell-site receiver, for measuring signal power in each CDMA communication signal directed to said respective cell-site receiver from a corresponding mobile telephone transmitter in communication therewith; a plurality of power adjustment command generator means, each coupled to a respective cell-site transmitter and corresponding second power measurement means, for generating power adjustment commands corresponding to deviations in power measurements of said corresponding second power measurement means from a second predetermined power level, said respective cell-site transmitter transmitting said power adjustment commands, wherein said power adjustment commands are indicative of a request for at an increase in mobile telephone transmitter power when said second power measurement means measured power is below said second power level and indicative of a decrease in mobile telephone transmitter power when said second power measurement means measured power is above said second power level; and second power adjustment means, coupled to said mobile telephone receiver system and corresponding transmitter, said second power adjustment means responsive to said power adjustment commands directed to said respective mobile telephone receiver system for decreasing transmission signal power of said mobile telephone transmitter when said power adjustment commands as transmitted by at least one of said cell-site and received at said mobile telephone receiver system is indicative of a decrease in transmission signal power of said mobile telephone transmitter and for increasing transmission signal power of said mobile telephone transmitter when said transmitted power adjustment commands as transmitted by all of said cell-sites and received at said mobile telephone receiver system are indicative of an increase in transmission signal power of said mobile telephone transmitter.
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