TH22697A - Methods and modulators in radio systems - Google Patents

Abstract

Methods and devices for stabilizing the transmit power level in radio systems use the vehicle-to-interference (C/I) ratio of the communication channel. The goal of the C/I is to reduce one-way interference. Increasing the transmit power compensates for this, but at a level where the C/I is below a certain threshold, path loss and channel gain can also be determined and used in tuning.

Claims (10)

1. In a radio communication system with multiple transmitting stations, the method of adjusting the power level of the radio signal transmitted through the channel from the transmitting station to the receiving station involves the radio signal reception phase. The radio signal is transmitted at a known transmitting power by the transmitting station. The quality conditions associated with the received signal transmitted at that known transmitting power level are measured. A new transmitting power level is then determined for the transmitting station based on these quality conditions and the known transmitting power level; otherwise, the new transmitting power level would be independent of the transmitting power levels of other transmitting stations. The transmitting station is then instructed to transmit the radio signal at the new transmitting power level. The new transmitting power level is set so that, when it is greater than the known transmitting power level, the quality conditions associated with the received signal transmitted at the new transmitting power level will be worse than the quality conditions associated with the received signal transmitted at the known transmitting power level. 2. Method of claim number 1 where the transmitting station is a mobile station in the cellular telephone system. 3. In a radio communication system with multiple transmitting stations, the method of adjusting the power level of the radio signal transmitted through the channel from the transmitting station to the receiving station, which includes the radio signal reception phase, involves the radio signal being transmitted at a known power level by the transmitting station. The quality conditions associated with the received signal transmitted at that known power level are measured. A new power level is determined for the transmitting station based on these quality conditions and the known power level; otherwise, the new power level would be independent of the power levels of other transmitting stations. The transmitting station is then instructed to transmit the radio signal at the new power level, where the quality condition is one of the bit error rate and bit error content; and the new power level is determined so that, when the new power level is greater than the known power level, the quality conditions associated with the received signal transmitted at the new power level will be worse than the quality conditions associated with the received signal transmitted at the known power level. 4. In a radio communication system with several transmitting stations, the method of adjusting the power level of the radio signal transmitted from the transmitting station channel to the receiving station involves the radio signal reception phase. The radio signal is transmitted at a known transmit power level by the transmitting station. The quality conditions associated with the received signal transmitted at that known transmit power level are measured. A new transmit power level is determined for the transmitting station based on these quality conditions and the known transmit power level; otherwise, the new transmit power level is independent of the transmit power levels of other transmitting stations. The station is instructed to transmit the radio signal at the new transmit power level. The received power level associated with the received signal is measured; and the channel gain is determined based on the received power level and the known transmit power level. The new transmit power level is set so that, when the new transmit power level is greater than the known transmit power level, the quality conditions associated with the received signal transmitted at the new transmit power level are worse than the quality conditions associated with the received signal transmitted at the known transmit power level. 5. Method of claim 4 where the transmitting station is a mobile station in the cellular telephone system. 6. Equipment for adjusting the transmitting power of a transmitting station in a radio communication system, which includes a path for receiving radio signals transmitted at a known transmitting power level by the transmitting station; a path for measuring the quality conditions associated with the received signal; and a path for determining a new transmitting power level for the transmitting station based on known quality conditions and transmitting power levels. The quality conditions associated with the received signal transmitted at the new transmitting power level will be worse than the quality conditions associated with the received signal transmitted at the known transmitting power level. 7. Equipment of claim number 6 where the transmitting station is a mobile station in the cellular telephone system. 8. Devices for adjusting the transmit power level of a transmitting station in a radio communication system, which include: a path for receiving radio signals transmitted at a known transmit power level by the transmitting station; a path for setting quality conditions related to the received signal; a path for setting a new transmit power level for the transmitting station based on known quality conditions and power levels; otherwise, the new transmit power level will be independent of the transmit power levels of other transmitting stations; and a path for instructing the transmitting station to transmit at the new transmit power level, where the quality condition is one of the bit error rate and bit error content; and the new transmit power level is determined so that, when the new transmit power level is worse than the quality conditions related to the received signal transmitted at the known transmit power level. 9. Equipment for adjusting the transmit power level of a transmitting station in a radio communication system, which includes: a path for receiving radio signals transmitted at a known transmit power level by the transmitting station; a path for measuring the quality conditions associated with the received signal; a path for setting a new transmit power for the transmitting station based on the known quality conditions and transmit power level; otherwise, the new transmit power level will be independent of the transmit power of other transmitting stations; a path for instructing the transmitting station to transmit at the new transmit power level; a path for determining the gain of the base channel of the received level and the known transmit power level, where the new transmit power level is also based on the channel gain; and a path to determine the new transmit power level so that, when the new transmit power level is greater than the known transmit power, the quality conditions associated with the received signal transmitted at the new transmit power level will be worse than the quality conditions associated with the received signal transmitted at the known transmit power level. 10. Equipment of claim 9 where the transmitting station is a mobile station in a cellular telephone system (Clause 10, 3 pages, 6 figures).