Maintaining a maintenance channel in a reverse link of a wireless communications system
First Claim
1. A method of transmitting a request signal to a base transceiver station (BTS) using a first reverse link channel, the method comprising:
- receiving, by a field unit, assignment information;
wherein the assignment information is used to determine a value associated with an offset;
applying a modulo function to at least the determined value to compute a series of periodic time intervals, each time interval including at least one time slot, in the first reverse link channel for transmitting the request signal;
wherein the request signal indicates that the field unit is requesting to transmit packet data to the BTS;
receiving a first power control message for the first reverse link channel and a second power control message for a second reverse link channel;
determining a first power level for the first reverse link channel in response to the first power control message and a second power level for the second reverse link channel in response to the second power control message; and
transmitting the request signal using the first reverse link channel at the first power level to the BTS in the computed time interval;
wherein the first reverse link channel is transmitted when the field unit is not allocated a second reverse link channel to transmit packet data;
wherein in response to the field unit being allocated the second reverse link channel, transmitting the second reverse link channel at the second power level.
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Accused Products
Abstract
In a reverse link of a wireless CDMA communication system, a method of maintaining an idling mode connection between a field unit and a base transceiver station is provided using various techniques to maintain the idle mode connection at a reduced power level. A preferred embodiment computes a time slot or frame offset based on modulo function using a field unit identifier in order to distribute field unit maintenance transmissions among available slots or offsets. An alternate embodiment detects explicit signaling states changes at the physical layer and causes power target changes. A further embodiment transmits maintenance data during predetermined time intervals, coordinated between the field units and BTS, allowing power levels to be adjusted accordingly.
30 Citations
16 Claims
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1. A method of transmitting a request signal to a base transceiver station (BTS) using a first reverse link channel, the method comprising:
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receiving, by a field unit, assignment information;
wherein the assignment information is used to determine a value associated with an offset;applying a modulo function to at least the determined value to compute a series of periodic time intervals, each time interval including at least one time slot, in the first reverse link channel for transmitting the request signal;
wherein the request signal indicates that the field unit is requesting to transmit packet data to the BTS;receiving a first power control message for the first reverse link channel and a second power control message for a second reverse link channel; determining a first power level for the first reverse link channel in response to the first power control message and a second power level for the second reverse link channel in response to the second power control message; and transmitting the request signal using the first reverse link channel at the first power level to the BTS in the computed time interval;
wherein the first reverse link channel is transmitted when the field unit is not allocated a second reverse link channel to transmit packet data;
wherein in response to the field unit being allocated the second reverse link channel, transmitting the second reverse link channel at the second power level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A field unit for transmitting a request signal to a base transceiver station (BTS) using a first reverse link channel, the field unit comprising:
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a circuit configured to receive assignment information;
wherein the assignment information is used by the field unit to determine a value associated with an offset;the circuit is further configured to receive a first power control message for the first reverse link channel and a second power control message for a second reverse link channel; the circuit is further configured to determine a first power level for the first reverse link channel in response to the first power control message and a second power level for the second reverse link channel in response to the second power control message; the circuit is further configured to apply a modulo function to at least the determined value to compute a series of periodic time intervals in the first reverse link channel for transmitting the request signal;
wherein each time interval includes at least one time slot;
wherein the request signal indicates that the field unit is requesting to transmit packet data to the BTS; andthe circuit is further configured to transmit the request signal using the first reverse link channel at the first power level to the BTS in the computed time interval;
wherein the first reverse link channel is transmitted when the field unit is not allocated a second reverse link channel to transmit packet data;
wherein in response to the field unit being allocated the second reverse link channel, the circuit is further configured to transmit the second reverse link channel at the second power level. - View Dependent Claims (10, 11, 12)
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13. A base station for receiving a request signal using a first reverse link channel, the base station comprising:
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a circuit configured to transmit assignment information;
wherein the assignment information is used by a field unit to determine a value associated with an offset;the circuit is further configured to transmit a first power control message for the first reverse link channel and a second power control message for a second reverse link channel; the circuit is further configured to apply a modulo function to at least the determined value to compute a series of periodic time intervals in the first reverse link channel for receiving the request signal from the field unit;
wherein each time interval includes at least one time slot;
wherein the request signal indicates that the field unit is requesting to transmit packet data to the base station; andthe circuit is further configured to receive the request signal using the first reverse link channel that was transmitted at a first power level set in response to the transmitted first power control message in the computed time interval;
wherein the first reverse link channel is transmitted when the field unit is not allocated a second reverse link channel to transmit packet data;
wherein in response to the field unit being allocated the second reverse link channel, the circuit is further configured to receive the second reverse link channel at the second power level. - View Dependent Claims (14, 15, 16)
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Specification