Method and system for controlling transmit power of network nodes
First Claim
Patent Images
1. An open loop method of transmission power control for use in a data communications network comprising a central control node and at least one remote subscriber node, said method comprising the steps of:
- a) transmitting a first signal from the central control node to the remote subscriber node;
b) measuring a received power level of the first signal received at the remote subscriber node; and
c) setting a transmit power level of the remote subscriber node in response to the received power level;
wherein the setting step c), further comprises the steps of;
i) using the received power level as an index into the look-up table of transmit power attenuator values;
ii) selecting the indexed attenuation value; and
iii) attenuating the transmit power level by the selected attenuation value; and
wherein the transmit power level of the remote subscriber node is set before the remote subscriber node has transmitted any signals onto the network.
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Abstract
The transmit power of the subscriber terminals in a wireless network can be controlled by measuring the received power of a signal transmitted from an access point to a subscriber terminal at the subscriber terminal and then using the measured value as an index into a look-up table of transmit power attenuator settings. The use of a simple look-up table reduces the implementation complexity, since no complicated calculations must be performed to achieve effective power control.
140 Citations
16 Claims
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1. An open loop method of transmission power control for use in a data communications network comprising a central control node and at least one remote subscriber node, said method comprising the steps of:
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a) transmitting a first signal from the central control node to the remote subscriber node;
b) measuring a received power level of the first signal received at the remote subscriber node; and
c) setting a transmit power level of the remote subscriber node in response to the received power level;
wherein the setting step c), further comprises the steps of;
i) using the received power level as an index into the look-up table of transmit power attenuator values;
ii) selecting the indexed attenuation value; and
iii) attenuating the transmit power level by the selected attenuation value; and
wherein the transmit power level of the remote subscriber node is set before the remote subscriber node has transmitted any signals onto the network. - View Dependent Claims (2, 3, 4, 5, 6, 13, 14)
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7. An open loop system for controlling transmit power levels for use in a data communications network comprising a central control node and at least one remote subscriber node, said system comprising:
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a) transmission means for transmitting a first signal from said central control node to said remote subscriber node;
b) measurement means for measuring a received power level of the first signal received at the remote subscribe node; and
c) setting means for setting a transmit power level of the remote subscriber node in response to the received power level comprising;
i) indexing means for using the received power level as an index into the look-up table of transmit power attenuator values;
ii) selection means for selecting the indexed power attenuator value from the look-up table; and
iii) attenuation means for attenuating the transmit power level by the selected attenuation value; and
wherein the setting means set the transmit power level of the remote subscriber node before the remote subscriber node has transmitted any signal onto the network. - View Dependent Claims (8, 9, 10, 11, 12, 15, 16)
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Specification