Method to control base station transmit power drift during soft handoffs
First Claim
1. A method for use in wireless equipment, the method comprising the steps of:
- receiving user channel transmit power information from base stations involved in a soft handoff with user equipment; and
receiving information from the user equipment;
wherein the wireless equipment determines a reference user transmit power level for use by the base stations as a function of the received user channel transmit power information and the received information from the user equipment.
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Accused Products
Abstract
A UNMTS (universal mobile telecommunications system) based system comprises a common control point, a number of base stations, K, and a mobile terminal. During a soft handoff involving the K base stations and the mobile terminal, the common control point receives individual user channel transmit powers from each of the K base stations. In addition, the common control point receives two parameters from the mobile terminal—the identity of that base station involved in the soft handoff that has the strongest received signal at the mobile terminal and, on an average, a value representing how much stronger the received SNR was in comparison to the SNR target maintained by the mobile terminal. The common control point then decides on a downlink reference user channel transmit power for each of the base stations as a function of the individual user channel transmit powers reported by each base station involved in the soft handoff and the information provided from the mobile terminal.
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Citations
19 Claims
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1. A method for use in wireless equipment, the method comprising the steps of:
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receiving user channel transmit power information from base stations involved in a soft handoff with user equipment; and
receiving information from the user equipment;
wherein the wireless equipment determines a reference user transmit power level for use by the base stations as a function of the received user channel transmit power information and the received information from the user equipment. - View Dependent Claims (2, 3)
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4. A method for use in wireless equipment, the method comprising the steps of:
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receiving user channel transmit power information from base stations involved in a soft handoff with user equipment; and
receiving information from the user equipment, wherein the information comprises an identifier of that base station with a received signal at the user equipment stronger than other base stations and a signal-to-noise ratio value associated with the identified base station;
determining a downlink reference power from the received user channel transmit power information and the received information from the user equipment; and
transmitting the determined downlink reference power to the base stations. - View Dependent Claims (5)
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6. A method for use in wireless equipment during a soft handoff with a number of base stations, the method comprising the steps of:
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identifying that base station with a received signal at the wireless equipment stronger than other base stations; and
calculating a signal-to-noise ratio value associated with the identified base station; and
transmitting the identify of the identified base station and the calculated signal-to-noise ratio to a control point of a wireless system. - View Dependent Claims (7, 8)
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9. Apparatus for use in wireless equipment, the apparatus comprising:
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a receiver for receiving user channel transmit power information from base stations involved in a soft handoff with user equipment, and receiving information from the user equipment; and
a processor for determining a reference user transmit power level for use by the base stations as a function of the received user channel transmit power information and the received information from the user equipment. - View Dependent Claims (10, 11, 13, 15, 16, 18, 19)
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12. Apparatus for use in wireless equipment, the apparatus comprising:
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a transceiver for (a) receiving user channel transmit power information from base stations involved in a soft handoff with user equipment, (b) receiving information from the user equipment, wherein the information comprises an identifier of that base station with a received signal at the user equipment stronger than other base stations and a signal-to-noise ratio value associated with the identified base station, (c) transmitting a downlink reference power to the base stations; and
a processor for use in determining the downlink reference power from the received user channel transmit power information and the received information from the user equipment.
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14. Apparatus for use in wireless equipment during a soft handoff with a number of base stations, the apparatus comprising:
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a processor for use in (a) identifying that base station with a received signal at the wireless equipment stronger than other base stations, and (b) calculating a signal-to-noise ratio value associated with the identified base station; and
a transmitter for transmitting the identify of the identified base station and the calculated signal-to-noise ratio to a control point of a wireless system.
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17. A transmission frame representing data embodied in a wireless transmission signal, the transmission frame comprising:
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a first portion of a field comprising at least one bit for conveying data representative of an identifier for identifying a base station whose received signal at a user equipment is stronger than other received signals from other base stations at the user equipment; and
a second portion of the field comprising at least one bit for conveying data representative of a value associated with a signal-to-noise measure of the received signal from the identified base station at the user equipment.
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Specification