Abstract: A method generally establishes a communication link in a communication system when a cordless base station has been authenticated to communicate with authorization equipment, and the authorization equipment has been authenticated to communicate with the cordless base station. Preferrably, one or more random numbers are transmitted between the cordless base station and the authorization and call routing equipment to establish the communication link.

Abstract: A method and apparatus reduces current consumption of a mobile communication unit, such as a cellular or mobile telephone that communicates with a base station by disabling a temperature controlled crystal oscillator and a code generator while the mobile communication unit is in a sleep mode of operation, thereby reducing the sleep mode current consumed by the mobile communication unit. Prior to entering sleep mode, the mobile communications unit stores the state of the code generator and disables the temperature controlled crystal oscillator. Upon waking from sleep mode, the mobile communication unit calculates what the state of its code generator would have been if its temperature controlled crystal oscillator had not been disabled, and uses this calculated state to achieve synchronization with a code generator in the base station.

Abstract: A call routing system includes an authorization and call routing equipment (ACRE) 117, a cordless base station 115 connected by a wireline network 111 having caller identification. The cordless base station 115 initiates a call to the ACRE 117, which receives the cordless base station's 115 telephone number. The ACRE 117 then uses the telephone number for routing subsequent telephone calls to the cordless base station 115. The cordless base station 115 can receive and store caller indentification information and transmit this information to a radiotelephone 101.

Abstract: A system for choosing a communication having an ACRE 117, a radiotelephone 101 and a cordless base station 115. The cordless base station 115 connected to the ACRE 117 by a wireline network 111 and receiving a message authorizing the use of a subset of channels. The cordless base station 115 determining which of the set of channels meets a channel quality criteria and only communicating over a channel, to the radiotelephone 101, if the channel meets the channel quality criteria and is authorized.

Abstract: A dual mode cellular cordless portable radiotelephone preferentially selects the cordless base station over the cellular system when in range of the cordless base station. When the cordless cellular portable is operating in the cellular mode, the radio channel associated with the cordless base station is sampled for a predetermined time. When a signal on the sampled cordless base station channel is detected, the cordless portable moves to the cordless mode and remains in the cordless mode for as long as the signal quality of the signal on the cordless base station channel exceeds a predetermined value.

Abstract: The method of the present invention generally validates a communication link in a communication system. In particular, the method validates a communication link between a cordless base station and authorization and call routing equipment by authenticating the cordless base station to communicate with said authorization equipment (603) and authenticating the authorization equipment to communicate with the cordless base station (604). Preferrably, the step of authenticating the cordless base station is based upon a first random number generated within the authorization equipment (502) and the step of authenticating the authorization equipment is based upon a second random number generated within the cordless base station (504). A communication link is allowed between the cordless base station and the authorization equipment when both the cordless base station and the authorization equipment have been authenticated (614).

Abstract: A method generally improves the frequency accuracy in a communications system without requiring the use of accurate frequency references in all of the stations or types of stations. An accurate frequency reference is utilized in one of the stations or station types. The reference frequencies of the remaining stations or station types can be adjusted based upon the accurate reference frequency in one of the stations.

Abstract: A communication system has a PCC 101 which receives a data stream from a cordless base station 115. The cordless base station 115 transmits an indication in the data stream that it is going to begin a scan. While the cordless base station 115 is scanning, the PCC 101 performs a scan of its own. The PCC 101 also performs a scan when it determines that a message is a repeat and has been previously received.

Abstract: A communication system has a PCC 101 which receives a data stream from an cordless base station 115 when the PCC 101 is not engaged in a telephone call. The data stream has a repeat indication field 508 and a message field 506 that the PCC 1 01 uses to determine if the message has already been received. If the PCC 101 determines the message was already received, the PCC 101 turns off its receiver 401 for a duration of time slightly less than the message field time. This results in a power savings for the PCC 101.

Abstract: The method of the present invention generally validates a communication link in a communication system. In particular, the method validates a communication link between a cordless base station and authorization and call routing equipment by authenticating the cordless base station to communicate with said authorization equipment (603) and authenticating the authorization equipment to communicate with the cordless base station (604). Preferrably, the step of authenticating the cordless base station is based upon a first random number generated within the authorization equipment (502) and the step of authenticating the authorization equipment is based upon a second random number generated within the cordless base station (504). A communication link is allowed between the cordless base station and the authorization equipment when both the cordless base station and the authorization equipment have been authenticated (614).

Abstract: A cellular cordless telephone may receive cellular telephone calls via a cellular telephone system and receive telephone calls on a system having a limited radio coverage area. To reduce the amount of time spent in monitoring the sub-data channel of the limited coverage area system, a timing signal is generated which represents the period of time spent monitoring the radio channel. During the monitoring, a predetermined number of data words transmitted on the limited radio coverage area radio channel system are received. When a first received data word is detected, an allowed monitoring time value is adjusted to be the sum of the value of the timing signal and the product of a determined number of received words to be detected and the time required for each word. This adjusted value of the monitoring time value is compared to the value of the timing signal and when the adjusted monitoring time value equals or exceeds the timing signal value, the monitoring of the radio channel ceases.

Abstract: A unique method and apparatus processes and validates Manchester-coded data transmitted on a communications channel and containing a synchronization word and a data word including a plurality of data bits and coded according to a predetermined BCH error correcting code. Each data bit has a binary state determined by a left half non-return-to zero (NRZ) bit sample and a right half NRZ bit sample.

Abstract: A dual mode cellular cordless portable radiotelephone preferentially selects the cordless base station over the cellular system when in range of the cordless base station. When the cordless cellular portable is operating in the cellular mode, the radio channel associated with the cordless base station is sampled for a predetermined time. When a signal on the sampled cordless base station channel is detected, the cordless portable moves to the cordless mode and remains in the cordless mode for as long as the signal quality of the signal on the cordless base station channel exceeds a predetermined value.