Outer Loop Transmit Power Control in Wireless Communication Systems
First Claim
1. A method of adjusting a target signal-to-interference ratio, SIR, for use in controlling transmitted power of a signal received from a remote transmitter, the method comprising, for each of a plurality of iterations of an outer-loop power control loop:
- measuring a short-term block error rate for the received signal;
calculating a coarse SIR adjustment as a function of the short-term block error rate, a target block error rate, and a first loop tuning parameter; and
determining a new target SIR based on a prior target SIR and the calculated coarse SIR adjustment.
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Accused Products
Abstract
Outer-loop power control methods and apparatus are disclosed. In an exemplary embodiment, a short-term block error rate is measured for a received signal, and a coarse adjustment to a target signal-to-interference ratio (SIR) is calculated as a function of the short-term block error rate, a target block error rate, and a first loop tuning parameter. In some embodiments, a fine adjustment to the target SIR is also calculated, as a function of a smoothed block error rate, the target block error rate, and a second loop tuning parameter. The coarse adjustment provides quick responsiveness to received block errors, while the fine adjustment moderates the coarse adjustments by accounting for a longer-term view of the received block error rate. The target SIR adjustments disclosed herein may be computed in each of several iterations of an outer-loop power control loop.
61 Citations
30 Claims
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1. A method of adjusting a target signal-to-interference ratio, SIR, for use in controlling transmitted power of a signal received from a remote transmitter, the method comprising, for each of a plurality of iterations of an outer-loop power control loop:
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measuring a short-term block error rate for the received signal; calculating a coarse SIR adjustment as a function of the short-term block error rate, a target block error rate, and a first loop tuning parameter; and determining a new target SIR based on a prior target SIR and the calculated coarse SIR adjustment. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A transceiver in a mobile communication network for controlling the transmit power of a signal received from a remote transmitter, comprising
a decoder configured to measure a short-term block error rate for a received signal, and a power control module comprising an outer-loop power control unit configured to, for each of a plurality of iterations of an outer-loop power control loop: -
calculate a coarse SIR adjustment as a function of the short-term block error rate, a target block error rate, and a first loop tuning parameter; and determine a new target SIR based on a prior target SIR and the calculated coarse SIR adjustment. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification