Wireless communication system with symmetric communication protocol
First Claim
1. A wireless communication system, comprising:
- a first transmitter in a first wireless communication unit to transmit data to a second wireless unit, the first transmitter operating at a selected frequency to transmit a request to communicate with the second wireless unit;
a first receiver in the first wireless communication unit to receive data from the second wireless unit;
a second receiver in the second wireless unit monitoring the selected frequency to thereby detect the request to communicate transmitted from the first wireless unit;
a second transmitter to transmit a response signal to the first wireless unit to indicate reception of the request to communicate, the first and second wireless units thereby establishing a communication link with the first wireless unit functioning as a master unit and the second wireless unit functioning as a slave unit;
a first signal monitor in the first wireless unit coupled to the first receiver and determining a first received signal strength indicative of a strength of the signal received from the second wireless unit, the first transmitter transmitting a power change request signal to the second wireless unit if the first received signal strength is above or below a first set of predetermined limits; and
a second signal monitor in the second wireless unit coupled to the second receiver and determining a second received signal strength indicative of a strength of the signal received from the first wireless unit, the second transmitter transmitting a power change request signal to the first wireless unit if the second received signal strength is above or below a second set of predetermined limits.
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Accused Products
Abstract
A symmetrical communication protocol allows handsets to operate as a master unit or a slave unit and operate independently of any base station. Remote units may contact each other directly with the calling unit being temporarily designated as a master unit and the called unit being designated temporarily as a slave unit. A wireless communication link is established between the two units and the units frequency-hop in synchronization in accordance with FCC requirements. The units independently monitor the signal strength of the incoming signal and can transmit power change commands to the other unit to increase or decrease transmission power as required. A calling unit initially transmits a call request on a limited number of the available frequency channels in order to decrease the acquisition time period. An idle unit has a sleep cycle and an awake cycle. When entering the awake cycle, the idle unit is programmed for operation at one of the acquisition channels and monitors for an incoming data frame intended for that unit. If a data frame is not detected, the unit returns to the sleep cycle. If a data frame is detected, the handsets synchronize and communicate over the entire range of operational frequency channels utilizing a predetermined pseudo-random sequence.
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Citations
33 Claims
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1. A wireless communication system, comprising:
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a first transmitter in a first wireless communication unit to transmit data to a second wireless unit, the first transmitter operating at a selected frequency to transmit a request to communicate with the second wireless unit;
a first receiver in the first wireless communication unit to receive data from the second wireless unit;
a second receiver in the second wireless unit monitoring the selected frequency to thereby detect the request to communicate transmitted from the first wireless unit;
a second transmitter to transmit a response signal to the first wireless unit to indicate reception of the request to communicate, the first and second wireless units thereby establishing a communication link with the first wireless unit functioning as a master unit and the second wireless unit functioning as a slave unit;
a first signal monitor in the first wireless unit coupled to the first receiver and determining a first received signal strength indicative of a strength of the signal received from the second wireless unit, the first transmitter transmitting a power change request signal to the second wireless unit if the first received signal strength is above or below a first set of predetermined limits; and
a second signal monitor in the second wireless unit coupled to the second receiver and determining a second received signal strength indicative of a strength of the signal received from the first wireless unit, the second transmitter transmitting a power change request signal to the first wireless unit if the second received signal strength is above or below a second set of predetermined limits. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A wireless communication system to control communication between first and second wireless units, comprising:
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a first transmitter in the first wireless communication unit to transmit data to the second wireless unit, the first transmitter operating at a selected frequency to transmit a request to communicate with the second wireless unit;
a first receiver in the first wireless communication unit to receive data from the second wireless unit;
a second receiver in the second wireless unit monitoring the selected frequency to thereby detect the request to communicate transmitted from the first wireless unit;
a second transmitter to transmit a response signal to the first wireless unit to indicate reception of the request to communicate, the first and second wireless units thereby establishing a communication link with each other;
a first signal monitor in the first wireless unit coupled to the first receiver and determining a first received signal strength indicative of a strength of the signal received from the second wireless unit, the first transmitter transmitting a power change request signal to the second wireless unit if the first received signal strength is above or below a first set of predetermined limits; and
a second signal monitor in the second wireless unit coupled to the second receiver and determining a second received signal strength indicative of a strength of the signal received from the first wireless unit, the second transmitter transmitting a power change request signal to the first wireless unit if the second received signal strength is above or below a second set of predetermined limits. - View Dependent Claims (17, 18, 19, 20, 21, 22)
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23. A method to control communication between first and second wireless units in a wireless communication system, the method comprising:
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transmitting, at a selected frequency, a request to communicate with the second wireless unit from the first wireless communication unit;
monitoring the selected frequency to thereby detect the request to communicate transmitted from the first wireless unit;
transmitting, at the selected frequency, a response signal from the second wireless unit to the first wireless communication unit to thereby establish a communication link between the first wireless unit and the second wireless unit with the first wireless unit functioning as a master unit and the second wireless unit functioning as a slave unit;
determining a first received signal strength indicative of a strength of the signal received from the second wireless unit;
transmitting a power change request signal from the first wireless unit to the second wireless unit if the first received signal strength is above or below a first set of predetermined limits;
determining a second received signal strength indicative of a strength of the signal received from the first wireless unit; and
transmitting a power change request signal from the second wireless unit to the first wireless unit if the second received signal strength is above or below a second set of predetermined limits. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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Specification