JP2003116180A - General purpose radio telephone mobile communicating method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve cellular and cordless radio telephone mobile communication equipment and method. SOLUTION: This communication equipment comprises an RF circuit having an antenna 382, an RF/IF conversion circuit, a receiving part 301 having a communication path with first filters 333 and 328 for transporting a signal in first (cellular) and second (cordless), integer multiple higher than the first, frequency ranges and a circuit 335 for blocking a signal in the second frequency range and capable of switching the blocking circuit to a communication path with the first filters, a first transmitting part 302 for mutually connecting the antenna to the RF/IF conversion signal for transporting a signal within the first frequency range and also having a signal division circuit, and a second transmitting part 303 having a signal doubling circuit 361 connected to the antenna and connected so as to receive a signal from the signal division circuit and for increasing a frequency in a band of the second frequency range with respect to a frequency received from the signal division circuit. The receiving part and the first and second transmitting parts share mixing devices/IF devices 322 to 326.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to radiotelephones and general purpose radio communication systems having multiple radio transmission medium interfaces for operating a single radiotelephone handset.

[0002]

Wireless telephones are used in a variety of wireless communication systems, each having different "radio transmission medium" (air) interface requirements. These various radio transmission medium interface systems include cellular radiotelephone systems, cordless telephone systems, and numerous other radiotelephone systems (eg, personal communication network (PCN) services). All of these systems require a radiotelephone handset designed to operate in a radio transmission medium interface system specific to that particular communication system.

Wireless telephone handsets are generally configured to operate in only one environment (ie, cellular, cordless, etc.). Therefore, in order to provide a wide range of services and to operate across systems having various radio wave transmission medium interfaces, separate radio telephone handsets are required for each system.

[0004]

A conventional method for extending the range of use of one radiotelephone handset to a plurality of radio communication systems is to use each one of the available radio communication systems. One approach is to combine two separate radiotelephone handset units that work only in one system into one package.

In this case, however, only one of these two independent units is active at any one time. Operation on different radio transmission medium interfaces is possible by switching from one independent unit to another independent unit as desired.

Such a technique and apparatus are described in US Pat. No. 4,989,230. The patent includes:
A cellular cordless telephone is disclosed in which separate cellular transceivers and cordless transceivers are combined in one package, each transceiver being connected to its radio transmission medium interface by an individual independent antenna.

From the above, there has been a demand for a general-purpose radio telephone mobile communication device and method capable of easily and efficiently operating in different radio wave transmission medium interfaces.

[0008]

A universal radiotelephone mobile communication device in accordance with the present invention operates in both first and second radiotelephone communication systems.

The first radiotelephone communication system has a first base station which transmits a radiotelephone signal in a first frequency band with a geographical wide area serving as a service range, and a second radiotelephone communication system comprises It has a second base station which transmits a radiotelephone signal in a second frequency band which is higher than the first frequency band and covers a short-distance local area. The second frequency band can be optimally selected with an appropriate offset that is less than twice the frequency in the first frequency band.

The general-purpose radiotelephone mobile communication device has a common basic band circuit which operates for a first base station whose service area is a wide area and a second base station whose service area is a local area. A common baseband circuit processes radiotelephone signals received from both base stations and signals generated by the handset user for transmission to either of these base stations.

In one embodiment, the general purpose radiotelephone mobile communication device operates in both first and second radiotelephone communication systems, the first radiotelephone communication system covering a wide area and serving a plurality of areas. A first base station having service and functionality and transmitting and receiving radiotelephone signals in a first frequency band; and a second radiotelephone communication system covering a local area and providing a local area service. And a second base station having functionality and transmitting a radiotelephone signal in a second frequency band higher than the first frequency band.

For the second frequency band, a suitable frequency less than twice the frequency contained in the first frequency band, and preferably in the frequency band actually adjacent to the upper range of the first frequency band. It can be optimally selected with an offset value. The second base station receives a radiotelephone signal in the third frequency band at a frequency that is a multiple of the first frequency band (generally three times).

In one embodiment, the universal radiotelephone mobile communication subscriber unit (eg, handset) includes both a first base station serving a wide area and a second base station serving a local area. A common baseband circuit having functionality extendable across the first and second wireless communication systems.

The common baseband circuit processes radiotelephone signals received from both base stations in the first and second frequency bands, and in any of these base stations in the first and third frequency bands. It processes the signal generated by the user of the wireless telephone handset for transmission to or from.

In one embodiment of the invention, the wireless telephone handset is dedicated to the first and second base stations, respectively.
It has minimized first and second high frequency circuits. First
High frequency circuit prepares the signal for transmission in a first frequency band for transmission to a first base station. First
Of the high frequency circuit is also operable for a second frequency band above but substantially adjacent to a portion of the first frequency band for receiving the cordless signal from the second base station.

The second high frequency circuit also has at least one frequency which is approximately three times the frequency of one of the signal frequencies in the first frequency band for transmission to the second base station.
Prepare the signal for transmission in a third frequency band having a number of frequencies. Both the first and second frequency bands are connected to a common baseband circuit.

By the term "minimized", signals from both a wide area service base station (ie cellular frequency) and a local area service base station (ie cordless frequency) are sent to two independent pre-frequency units. The handset transmit signal, which can be received without using a circuit,
A high frequency circuit arrangement within a radiotelephone handset is precisely defined which uses the same transmitter circuit except that required to increase the transmitter frequency by a factor of approximately three.

All signal transmission and reception is done through only one antenna. The size of the antenna is the first and the second
Is selected to be optimal for receiving signals within the frequency band of. Reception of signals in the first and second frequency bands generally uses a fraction of the wavelength of one frequency in the first and second frequency bands.

In one embodiment, the antenna is the first
Of the wavelength of one frequency in the frequency band of 1/4 (ie (1/4) λ) and 3/4 of the wavelength of one frequency in the third frequency band (ie (3/4) ) Λ) and has an electrical length such that it is used in connection with both the first and second high frequency circuits.

The filter circuit is capable of selectively interconnecting this one antenna to the first and second high frequency circuits to handle the received signal and the frequency of the received or transmitted communication signal. , To the appropriate one of the first and second high frequency circuits.

The transmit power levels in both the first and second operating bands are all controlled by the cellular and / or cordless base station monitoring subsystem to deliver the proper radiated power level for proper RF link operation. It is continuously monitored and adjusted. This results in satisfactory communication operating conditions over the entire range through one antenna.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A wireless communication system arrangement includes various individual radio transmission medium interfaces having different operating frequencies and characteristics, as schematically illustrated in FIG. A public telephone network 101 is connected via a trunk (relay line) 102 to a mobile switching center 103 which operates as a control center of a cellular telephone system. Mobile switching center 1
03 is a cellular telephone base station 104 via a trunk 105
Connected to.

Cellular telephone base station 104 is required to provide a channel for monitoring, control, and communication to a plurality of radio telephone handsets 107 (or simply handsets), which typically operate in the coverage area of the base station. Control and wireless transceiver. In this description, a user will use handset 107 to communicate with a public land telephone network through a cellular telephone network.

The public switched telephone network 101 also includes a private branch exchange (PB) installed in a cordless telephone base station 115 in a residential area or, alternatively, in a business or office building.
X) or key system. Handset 10
7 is also used to communicate with the public telephone network 101 via the cordless telephone base station 115.

According to the present invention, the handset 10 of FIG.
All 7 are identical devices and are capable of operating in both cellular and cordless radiotelephone coverage areas. The mode of operation depends on the interaction of handset 107 with either cellular telephone base station 104 or cordless telephone base station 115. The interaction of the monitor and control channels is shown in Figures 4-9.

Cellular telephone base station 1 corresponding to a wide area
The service area of 04 corresponds to a range of several tens of square kilometers, while the service area of the cordless telephone base station 115 is a local area of a size measured in square meters.
Cellular and cordless phones have significantly different radio transmission medium interfaces.

One of the notable differences is the frequency band of the radio frequencies used. Generally, each of the conventional dedicated radiotelephone handsets of the prior art typically operates in one of the two service areas illustrated and incompatible in the other area. However, according to the invention,
Handset 107 is fully operational in both cellular and cordless telephone service areas.

In general, a cellular system is 800-9
A frequency band of 00 MHz (that is, in the case of the United States, a range that requires approval by the Federal Communications Commission (FCC)),
Cordless systems, on the other hand, generally operate at frequencies near or within the frequency range of 46-49 MHz (ie, the unlicensed range in the United States). Such widespread differences between these frequencies act as a deterrent when trying to operate the same single radiotelephone handset unit in both cellular and cordless telephone coverage. .

In accordance with the present invention, frequency selection in combination with a radiotelephone handset platform adapted to make effective use of these frequencies results in the same one for both cellular and cordless radio transmission medium interfaces. It is possible to activate the wireless telephone handset of

An example of a frequency range suitable for optimum use with the telephoneless handset of FIG. 3 operating in both types of wireless communication systems, described below, is shown in the frequency graph of FIG. As shown in the graph, a typical cellular base station transmits in a frequency band 201 ranging from 870 MHz to 890 MHz and has a frequency of 825 MH.
A communication signal is received within the frequency band 202 from z to 845 MHz.

The portable telephoneless handset operates from 825 MHz to 845 MH when operating in cellular mode.
Transmit in the frequency band 203 up to z. In this case, the range of the frequency band 204 in the cellular mode is 8
From 70 MHz to 890 MHz.

The frequency band when operating in the cordless mode is, according to the invention, a higher frequency band which is significantly different from the frequency band just above the frequency band of the cellular and the frequency band currently used in cordless telephone systems. And both bands are selected. These higher frequency bands are selected from the frequency bands referred to by the FCC as Industrial, Scientific and Medical (ISM) frequency bands in the case of the United States. It will be appreciated by those skilled in the art that other frequency combinations may be used to meet global frequency band requirements without departing from the spirit and scope of the present invention.

The illustrated portable radiotelephone handset transmits cordless radiotelephone signals from 915 MHz to 92.
It operates to receive in a first frequency band 205 up to 3.5 MHz and transmit in a second frequency band 206 from 2475 MHz to 2483.5 MHz. This frequency band is in the case of the United States, FCC regulation 15.
License-free non-spread spectrum I based on 247
It is within the specified range for use of the SM frequency band.

The cordless telephone base station unit transmits the cordless radio telephone signal from 915 MHz to 923.5 MHz.
Transmit in frequency band 207 up to 2475 MH
It operates to receive in the frequency band 208 from z to 2483.5 MHz. As shown, the frequency bands 205, 206, 207, and 208 in this example all have equal bandwidth.

The frequency bands shown here exemplify the preferred bandwidth according to the present invention and are not limited thereto. Selection of other frequencies in accordance with the present invention will be straightforward to those skilled in the art. For example, it is possible that the cordless telephone base station functions by using the band frequency for cellular telephone if the holder of the license for the cellular system permits such operation.

A radiotelephone handset configured to efficiently utilize the plurality of radio frequency spectra described above in both cellular and cordless systems is shown schematically in FIG.

This radio telephone handset, shown in block diagram form in FIG. 3, comprises a cellular signal receiver (frequency band 87).
0 to 890 MHz) and cordless signal receiver (same as 91
5 to 923.5MHz) Cellular / 900MH
z-band cordless signal receiver 301, cellular signal transmitter (825-845 MHz) 302, 2.4 GHz
Band cordless signal transmitter (2475 to 2483.5M)
Hz) 303.

The circuit for processing the baseband signal for operation in the cellular (wide area) and cordless (local area) sections comprises an audio processing circuit 305, each of which is internal. A receive connected to bus 305 for control, data, and address,
It consists of transmission, input and output circuits.

Also on the bus 306 is a microcomputer 307 and a supervisory audio tone (SAT) processing circuit 308 for handling supervisory signals provided by the base station.
And a modem 309 for handling a call setup signal and a control signal transmitted by a digital system are connected, and these microcomputer 307, the audio frequency tone processing circuit 308 for monitoring, and the modem 309 form a central processing controller. I am configuring.

A user interface (display etc.) 304 is provided and connected to the bus 306. This user interface 304 is used to provide a user with an input means for voice intercom and control and to provide information about status and actions. The power for the wireless telephone handset is obtained by processing the battery output power supplied from the battery 311 in the power supply device 312.

In the receiving circuit, the fundamental band signal obtained as an output by reducing the incoming high frequency (RF) signal to an intermediate frequency (IF) signal and further demodulating it is an audio frequency processing circuit 3
It is supplied to 05. The audio frequency processing circuit 305 is a second intermediate frequency circuit 326 (455 kHz) having an FM detector.
Directly connected to. In the second intermediate frequency circuit 326,
The output from mixer 322 is provided.

The mixer 322 is a first intermediate frequency circuit 323.
It is connected to (45 MHz) and receives its output signal. The input of the first intermediate frequency circuit 323 is the first mixer 324.
Supplied from The input to the first mixer 324 is an appropriate bandpass filter and low noise linear amplifier 327.
It is supplied from the front end of the receiving section composed of. A reference oscillator 325 provides two mixed frequency signals applied to two mixers 322 and 324 via a synthesizer circuit 340 (or simply synthesizer) under the control of a microcomputer 307.

Local oscillator (or reference oscillator) 325
The input frequency supplied from the second mixer 322 to the second mixer 322 is a fixed frequency. In one general embodiment, this frequency is 4
5 MHz +/− 455 kHz (second intermediate frequency) (that is, a value obtained by adding or subtracting the second intermediate frequency (455 kHz) to the first intermediate frequency (45 MHz)).

In this embodiment, the synthesizer circuit for generating a transmission carrier generates a frequency for a cellular signal at an interval of 30 kHz and a frequency for a cordless signal at an interval of 10 kHz. From this, it is possible to obtain a channel spacing of 30 kHz in the range of 2475 to 2483.5 MHz in the local oscillation by triple the frequency before transmission.

The first mixer 324 is a high frequency amplifier 331.
Connected to the high-frequency signal reception output section of the high-frequency amplifier 33
1 receives the high frequency output of the receiver 301. The reception unit 301 has a cellular / ISM input band-pass filter 333 connected to the common antenna 382. The bandpass filter 333 has a pass frequency band adjusted to pass a cellular radio (high frequency) frequency band and an appropriate frequency section in the ISM frequency band used for cordless telephone communication.

Cellular / ISM input bandpass filter 33
3 output is ISM band stop filter with switch 3
35. The ISM band stop filter 335 is
It is branched and short-circuited by the high frequency switch 336. High frequency switch 336 is controlled to bypass ISM bandstop filter 335 when a signal at the cordless telephone frequency is being received. Also, the high frequency switch 336
Is open when the signal of the cellular telephone frequency is received, and the filter 33 in the input high frequency communication path is opened.
5 works.

Both cellular and cordless high frequency signals are connected to a low noise linear amplifier 327. The output of the low noise linear amplifier 327 is a combined cellular / IS
It is connected to the M-band filter 328. Cellular / ISM
Bandpass filter 328 passes both frequency bands. The output of the filter 328 is the high frequency amplifier 331.
Applied to. The high frequency amplifier 331 applies the filtered received signal to the first mixer 324. The relationship between this mixer and the circuit that generates the intermediate frequency signal has been described above.

The transmitted communication signal is generated by an oscillator (voltage controlled oscillator) controlled by the internal voltage of the synthesizer circuit 341 for transmission (or simply the synthesizer). The frequency of synthesizer 341 is modulated by an audio processing circuit or modem. When the synthesizer is set to the cordless signal transmission mode considering the frequency triple in the cordless signal transmission unit 303,
The operating range of the voltage controlled oscillator is reduced to 1/3. The basic band information is supplied to the transmitter unit 351.

The transmitter section 351 is connected so as to supply the high frequency signal for transmission to the high frequency amplifier 353. The output of the high frequency amplifier 353 is the divider circuit 354 (or simply,
The output of the divider 354 is sent in parallel to the cellular signal transmitter 302 and the 2.4 GHz band cordless signal transmitter 303. Transmitters 302 and 3
03 are individual power level controllers 332 and 383, respectively.
Respectively controlled from.

Power level controllers 332 and 383 define the output power operating for the transmission of high frequency communication signals. The techniques of these synthesizers, transmitter sections, dividers, and power controllers described above are well known to those skilled in the art and need not be described in detail.

The cellular signal transmitting section 302 is a high frequency power amplifier 3 which is connected in cascade and receives an input from a divider.
55, 356, 357. The power levels available from these amplifiers are controlled by power level controller 332. The selected power level is determined by the monitoring subsystem and the command signal executed by the microcomputer 307 based on the selected frequency band.

If the cellular communication option is selected, the power level is high, and in the 2.4 GHz band cordless signal transmitter, the power level controller 383.
Reduces the power level. The outputs from these cascaded or serially connected amplifiers 355, 356, 357 are applied to a cellular transmission bandpass filter 358, the output from which is connected to a single antenna 382. The antenna 382 has a size of 1/4 wavelength at the cellular transmission frequency in this embodiment.

The divider 354 for signal division also has a frequency of 3
It is connected to the 2.4 GHz band cordless signal transmission unit 303 via the multiplier 361. The frequency tripler 361 multiplies the frequency of the output of the transmitter unit 351 by a multiplier 3 and triples the frequency.
It operates so that the signal frequency falls within the desired 2.4 GHz cordless frequency range.

The output of the frequency tripler 361 is 2.4 G
Hz cordless frequency range (frequency band 20 in FIG.
6) It is applied to an IMS bandpass filter 363 having a pass band width that allows it to pass. The power level of this signal is controlled by power amplifier 364 as defined by power level controller 383.

The amplified signal is sent to the ISM band filter 3
65 and from there to a series LC resonant filter 366 tuned to the 2.4 GHz frequency band. This signal is connected to a single antenna 382. The antenna 382 has a size of ¾ of the wavelength at the 2.4 GHz band cordless transmission frequency in this embodiment.

Control of operation mode selection of the mobile radio telephone handset is determined by a built-in program included in the microcomputer 307. Many of these built-in programs are standard in existing wireless telephones and are well known to those skilled in the art and will not be described here. Built-in programs that contribute to the different operating mode functions are disclosed in the flow charts shown in FIGS.

The various processes detailed herein include:
Initialization procedure, call origination procedure, "channel switching" procedure as transfer from local (cordless) service to wide area (cellular) service, and "channel" as transfer from wide area (cellular) service to local (cordless) service. A "switch" procedure is included. Modifications to the basic procedures described below will be straightforward to those skilled in the art to customize the overall system functionality for a particular personal communication application.

The initialization procedure is invoked as soon as the wireless telephone handset (or simply the handset) is powered on, as shown in block 401 of FIG. The process proceeds to block 403 and the handset indicator is turned off. At block 405, the handset's features and options are read from the handset's internal memory. These features and options may be read from an external memory provided by the user, such as those incorporated in high performance card memory devices.

At the next decision block 407, it is checked whether the local system (eg cordless system) option has been enabled by the user. If the result is'yes', the process is block 4
Go to 09, where the command tunes the handset to the last known local setup channel.

Next, at decision block 411, for security purposes, it is checked whether the current signal is from a valid local (cordless) base station, ie, there is a valid local system identifier (ID). It If the ID is valid, the process proceeds to block 413, where the local channel number is stored. At the next block 415, the local services indicator is turned on to clearly indicate that local services are available.

The next step is to monitor the local setup control channel, as shown in block 417. Then, at decision block 419, if the local setup control channel is determined to be available, decision block 419 responsively returns the process to block 417 where monitoring of the local setup control channel is continued, Wait for communication service request in local mode. If the local setup control channel is not available, the process returns to block 403 in response to decision block 419.

Returning to the foregoing, if at decision block 411 it is determined that the local system ID is not valid, then at block 421 the instruction tunes the handset to the first channel in the local channel set. At the next decision block 423, the system I
It is also checked if D is valid. If so, the process returns to block 413, after which the process proceeds as above.

If it is determined at decision block 423 that the system ID is not yet valid, the process proceeds to block 425 where the instructions tune the handset radio channel to the next channel in the local channel set. . This sequential tuning of new channels continues until either the ID is determined to be valid or it is determined at decision block 427 that the local channel set has been exhausted.

If the local channel set has been exhausted, the process proceeds to block 429 where the local service indicator is turned off if it was previously on. In the next block 431, the option set in memory is read out and the decision block 43
At 3, it is determined whether the cellular service option is enabled by the user.

Returning to the foregoing, if the question in decision block 407 is not answered, the process proceeds directly to decision block 433 to determine if the cellular service option has been enabled by the user, as described above. To be done. If cellular service is enabled, then at the next instruction block 435 the conventional cellular setup channel acquisition process is performed.

At the next decision block 437, it is determined whether the cellular service setup channel is available. If not available, the process returns to block 403. However, if the setup channel is available, the next decision block 439 determines if the system ID is valid for the cellular network.

If the ID is not valid, the process also returns to block 403. If the ID is valid, the process proceeds to block 441 where the cellular service indicator that indicates whether the handset is in home mode or mobile mode is turned on. In block 443, timer 1 is set and block 4
At 45, the cellular setup channel is monitored during the set time based on the instructions of this block.

At decision block 447, the process returns from decision block 437 until the time length set by timer 1 has elapsed, and the process returns to block 405 when the time length set by timer 1 has elapsed. This action results in periodic checks for the availability of cordless (local) and cellular operating environments, which is communicated to the user via a display on the handset.

A call procedure for allowing a call from the wireless telephone handset is shown in the flow chart of FIG. The process is block 50
1, the idle (vacant) mode of cellular or cordless is displayed as the operation mode.

At the next decision block 503, in response to the push-down activation of the send button,
At block 505, the instruction is called. The command is a command to respond to a button press, such that a wireless telephone handset option, such as a local dial tone option, can be read from the handset's own memory or an external memory, such as a smart card memory device.

At the next decision block 507, it is checked whether cordless (local) service has been enabled. If the check result is "NO", the process proceeds to block 521, where an instruction here initiates a cellular telephone call. If at decision block 507 it is determined that cordless (local) service has been enabled, then at next instruction block 509 the handset tunes to the last known local setup channel for service in cordless mode. To be done.

At decision block 511, the system I
It is determined whether D is valid. If so, at block 513 the instruction turns off the cellular service indicator and at block 515 the instruction turns on the cordless (local) service indicator and accumulates. In the next block 517, the instruction causes a local (cordless) call in accordance with the cellular format.

If, at decision block 511, it is determined that the system ID is not valid, the process proceeds to block 519 where an instruction there causes the handset to tune to the channels contained in the local channel set. In the next decision block 523, again, the system ID
Is determined to be valid. If so, the process returns to block 513.

If, in decision block 523, it is determined that the system ID is not yet valid, the process proceeds to block 525 where the instructions tune the handset's radio channel to the next channel in the local channel set. . Tune the handset to the new channel as long as there are still local channels to follow.

If at block 527 it is determined that the local channel set has been exhausted, the process proceeds to block 529 where the local service indicator is turned off. At the next block 531, the options stored in memory are read.

At the next decision block 533, it is determined whether cellular retransmission has been enabled. If so, the process proceeds to block 521 and a cellular call is made. If not, the process proceeds to block 535, a reorder tone is issued and the process returns to start block 501.

The control function embodied in the present general purpose system is based on the assumption that an appropriate service range is available and when the wireless telephone handset is in use the local system (ie cordless system) and the cellular system. It is intended to perform transfer (channel switching) with the system. The channel switching procedure is shown in the flow charts of FIGS.

In these channel switching processes, it is assumed that the handset is in actual call handling and on the voice channel. For purposes of explanation, it is assumed that the channel switch described below is a "soft" channel switch such that the handset maintains the actual communication connection with its system, both local and cellular.

6 and 7, the local (cordless)
7 illustrates a process of channel switching from to wide area (cellular). The process initiates a flashing signal on the handset in response to a push-down activation of a button for the call trunk. If the received signal strength decreases, a channel switch from local (cordless) to wide area (cellular) is initiated during an active local call state as shown in block 601. Block 60
At 3, the instruction causes the received signal strength threshold value for channel switching to be read from the memory.

At decision block 605, it is checked if the average received signal strength is above an acceptable signal strength threshold (ie, the radiotelephone handset is within local service range). If so, the process returns to block 601 while the handset remains in the active local call state.

If the average value of the received signal strength is lower than the allowable signal strength threshold, the instruction at block 607 states: "If the user moves further away from the local base station, a channel switch is required. , And the call is lost (or disconnected) if not done, a "out of range" warning tone is issued to the handset user and displayed by a display mechanism on the handset.

At block 609, the instruction causes
Options stored either in internal memory or external memory, such as smart card memory, are read and in the next decision block 611 it is determined whether channel switching to cellular is enabled. It At the next block 613, the command causes a flash signal to be sent to the local base station to signal the request for a cellular channel switch.

At decision block 615, it is determined whether a command to send the dialed digits has been received. This check is repeated until a dialed digit transmission command is received. Block 617
At that instruction, the cellular number of the handset is sent to the local base station, and at block 619 there is a short delay to assist in handling the call in the transfer from the cordless (local) system to the cellular system. be introduced.

Then, in block 621, the instruction is
Retuning the handset receiver to acquire the cellular setup channel while continuing to transmit on the communication channel with the local base station. Next block 62
At 3, the 15 second timer (timer 1) is set. A certain length of time, for example 15 seconds, is set in order to establish a window for a successful channel switch from the local base station to the cellular base station.

At the next block 625, a 4.5 second timer (timer 2) is set. This set of lengths of time allows the handset to transmit for more than 4.5 seconds without checking the local receive channel or determining if a supervisory audible tone is still present. The presence of the radio frequency audio tones (SAT) signal is similar to the detection of loop current in landline telephones, instructing the call to be terminated if the call is lost for more than 5 seconds. To be done.

The process then proceeds to decision block 627 of FIG.
Proceed to to check whether the handset has received a message about a cellular page. If a call delivery message was received, at block 645 the instruction is:
The cellular transmitter of the handset is retuned to the cellular reverse set up channel and originates a call response message in response to the call message received from the cellular base station according to conventional cellular standards.

In block 647, the instruction now retunes the transmitter to the local channel for the duration of the call. At decision block 649, it is checked whether a cellular voice channel has been assigned, and if so, at block 651 the instructions indicate that the cellular voice channel assignment is complete and the local radio link is disconnected. The signal tones shown are transmitted on the local channel.

In the next block 653, the command sets the transmitter to the specified cellular voice channel, thus in block 655 the command enables the radiotelephone handset in the cellular system.

If at decision block 627 it is determined that no cellular call message has been received, the process proceeds to decision block 629 to check if the 15 second timer has expired. If so, the process proceeds to block 657 to retune the handset receiver to the local channel. Block 659 then issues a single reorder tone (1 to indicate that the channel switch to the cellular system was unsuccessful.
Cycle) and the local call returns to the active call state at block 661.

If, at decision block 629, it is determined that 15 seconds has not elapsed, then the process proceeds to decision block 631 where it is checked if the timer set 4.5 seconds has elapsed. If not, the process returns to the input of decision block 627.
If 4.5 seconds have passed, the next block 63
At 3, the command retunes the receiver to the local channel.

Next, at block 635, timer 3 is set to 300 ms. This 300 ms time period is the time frame during which the local base station needs to detect a supervisory audio tone (SAT) in order to maintain the call. At decision block 637,
It is checked if this 300 ms has elapsed. If not, then decision block 639 checks to see if a supervisory audio tone is present.

If a supervisory audio tone is present, the process recycles through decision block 637. If there are no monitor audio tones, block 6
At 43, the command causes the local call to be dropped and the process to end. If at decision block 637 the time of 300 ms has elapsed, the process proceeds to block 641 to retune the receiver to the cellular setup channel, and then the process proceeds to block 62.
Return to the input block 5 (FIG. 6).

Channel switching from the cellular system to the local (cordless) system is controlled based on the process shown in FIGS. This process
Overall, it is similar but not identical to the channel switching procedure described above. Block 7 is the starting point of the process
At 01 (FIG. 8), the wireless telephone handset is in an active cellular call.

In the next block 703, timer 1 is set to 4.5 seconds and in the next decision block 705 it is checked whether the local service is currently enabled. If not enabled, the process represents block 70 which represents an active cellular call state.
Return to 1.

If, at decision block 705, it is determined that the local service is enabled, the process proceeds to block 707, where the instruction tunes the handset to the last known local setup channel. At the next decision block 709, it is checked whether the 4.5 second timer set time has expired. If not, the process proceeds to decision block 719 where it is checked for a valid system ID.

If there is no valid system ID, the process proceeds to block 721 and the instruction updates this last local setup channel. The next decision block 723 checks to see if the local channel set has been exhausted.

If the check is exhausted, the process proceeds to block 725 where a reorder tone indicating that the channel switch to the local system has not completed (ie, the local base station is out of range). Send once (1 cycle). If the channel set has not been exhausted, the process proceeds to block 707 where the instruction tunes the handset to the last local setup channel. The process then continues to decision block 709 as described above.

If, in decision block 709, 4.5.
If it is determined that the seconds timer set time has expired, the process proceeds to block 711, where an instruction therein tunes the handset to the cellular channel. At the next block 713, timer 2 is set to 300 ms to ensure that the supervisory audio tone is present. As soon as decision block 715 determines that the 300 ms timer set time has elapsed, block 7
At 17 the instruction resets the 4.5 second timer and the process proceeds to the input of block 707.

At decision block 719, the system I
If D is determined to be valid, the process proceeds to block 727 and that instruction causes a channel switch notification to be issued. Then, in block 729, the instruction causes the handset to read the options stored in the internal memory or smart card memory. Decision block 731 determines whether channel switching to the local system has been enabled.

Block 7 if not enabled
At 33, the command returns the active cellular call status. If channel switching to the local system is enabled, then at block 735 the command causes a flush signal to be sent to the base station of the cellular system. At the next decision block 737, it is determined whether a command to send the dialed digits has been received and call transfer occurs when the process is complete.

At block 739, the instruction causes
The local number is sent to the cellular base station, block 74
At 1, a delay is inserted to support call processing.

Turning now to FIG. 9, at block 743 the instructions retune the handset to obtain the local setup channel and to continue transmission on the cellular voice channel. At block 745, the 15 second timer is set, and at block 747 the 4.5 second timer is set. Decision block 74
At 9, it is checked if a local call message has been received.

If a paging message has been received, then at block 751 the instruction retunes the handset transmitter to the reverse local setup channel and issues a paging response message. This instruction now in block 771 causes the transmitter to retune to the cellular system channel. Decision block 77
5 determines whether a local system voice channel assignment has been received.

If not, the process returns to decision block 749. If a local system voice channel assignment has been received, at the next block 779 the instruction causes a signaling tone to be sent on the cellular channel indicating that the cellular call is being terminated. In the next block 781 the instruction sets the transmitter of the wireless telephone handset to the local voice channel. In this way, the handset enters the local active call state, as shown in block 783.

If it is determined at decision block 749 that a local call message has not been received, the process proceeds to decision block 753 to check if the 15 second timer has expired. If so, the process proceeds to block 769 to retune the receiver of the handset to the cellular channel. Block 773 then emits a cycle of redirection tones indicating that the channel switch to the local system was not completed, and the handset returns to the active cellular call state, as shown in block 777.

If, at decision block 753, it is determined that 15 seconds has not elapsed, then the next decision block 755 checks to see if the timer set 4.5 seconds has elapsed. If not, the process returns to the input of decision block 749. If 4.5 seconds have passed, then the next block 757.
At that instruction retunes the receiver to the cellular channel.

Next, at block 759, the 300 millisecond timer is set. At decision block 761 it is checked if this 300 milliseconds has elapsed. If at decision block 761 it is determined that 300 milliseconds have elapsed, the process proceeds to block 767 to retune the receiver to the cellular setup channel, and then the process proceeds to block 74.
Return to 7.

If 300 milliseconds have not elapsed,
The process proceeds to decision block 763, where it is determined if a supervisory audio tone (SAT) is present, and if so, the process proceeds to decision block 76.
Return to 1 and recycle. If there is no supervisory audio tone, the call is dropped, the transmitter is turned off and reinitialized, and the process ends, as shown in block 765.

The base station suitable for application to the dual radio system is designed to start operation in the operation learning mode which is a part of the instruction in the operation learning mode as described above. During the learning mode time, the base station sends a forward control message, which is received by the handset and used in connection with the base station. In the exemplary embodiment, an AMPS signaling process is used.

[0110] The handset can be configured to ensure that it is complete (all digits) when calling or answering a call by some numeric field in the forward control message sent.
It is instructed to send both a telephone number and an electronic serial number (ESN). To indicate the receipt of this message, the handset has a local signal indicator (LSI)
Is provided.

When the user presses the "send" button, the handset performs a calling operation. The telephone number and the electronic serial number are stored in the memory of the microcomputer. The microcomputer monitors the basic unit operation and the base station acts to bring the handset back to an idle state. The learning mode is terminated by pressing and activating a button located at the base station and the base station unit accepts wireless system call and call responses only from "registered" handsets.

The learning mode is restarted as handsets are added to and removed from the enrollment list. When the learning mode is completed, the base station unit can be used for communication. Now the base station sends an overhead message,
This message is monitored by the handset (monitor)
To be done. If the transmitted identifier (ID) matches the serving system ID stored in the handset's numbering module, the handset is locked on the forward channel to indicate a local service indication.

In this way, a single local base station can be set up to handle multiple handsets. This is not currently allowed in conventional cordless units.

This motion learning mode is used to ensure that call connections are made only with qualified handsets. As a result, it is possible to prevent fraud through security measures that are currently used in conventional cellular systems. The handset user makes a call by dialing the number and pressing the "send" button. The base station reads the phone number and electronic serial number of the handset. If this handset is on the registration list,
The base station assigns a voice channel to this handset.

Calls addressed to the handset from the public telephone network over the land line are treated similarly.
It is assumed that the handset in the local area is monitoring the forward setup channel. The base station answers the call and sends a paging message for the telephone terminal where the subject was stored during the learning time.

All handsets are called sequentially,
If not, the base station responds to the caller with a stored voice message that the handset user is not available for a call. Operational functions in paging, calling, and channel switching will be described in detail when the operation of the subscriber cordless base station unit shown in FIG. 12 is described below.

A radio transceiver arrangement suitable for a base station is shown in FIG. This arrangement has multiple frequency conversion and filter circuits for printing over various scheduled cellular and cordless radiotelephone voice and data transmission frequencies. As can be seen, the transceiver includes a plurality of switches 1210, 1212, 1213, 1214, 12
15, 1216, and 1217, all of which are illustrated as two pole mechanical switches.

The switches 1210-1215 are for giving the transceiver an ISM frequency or a cellular frequency, and are integrally connected so as to perform simultaneous switching, and the switches 1216 and 1217 are for switching between the execution mode and the initialization mode. They are joined together to make the switch between them. Each switch has positions "a" and "b" except for switches 1216 and 1217, and switches 121
6 and 1217 have "initialize" and "execute" positions.

When the switch is connected to the "a" position, the transceiver operates to process signals in the cellular radio frequency range. Switches 1216 and 1217
Is in the “run” position, the base station receiver is
It can be tuned to either 24475-2483.5 MHz when operating in (local or cordless) mode, or 825-845 MHz when operating in cellular mode.

The initialization mode is a mode for allowing the base station to select an empty (ie unused) cell frequency for operation when performing initialization in either the cordless band or the cellular band. Is. This allows the cordless base station receiver to process signals in the cordless or ISM frequency range defined above. These switches are typically implemented as semiconductor switches under the control of controller 1201.

The controller 1201 comprises part of the microprocessor controller or the overall microprocessor controller of the base station and operates in a manner similar to the controller contained in the handset.

The operation of the base station transceiver will be described below.
For either cellular or cordless system operation, a description of the voice and data signal handling functions in its various frequency ranges and modes will be provided. If the transceiver is connected to process voice and data signals at cellular frequencies, the switch 12
10-1215 are all connected to terminal "a".

The antenna 1221 is the cellular filter 1
222 and 1223. These filters are connected in such a way that conventional double filtering and isolation of high frequency signals intended for full duplex transmission from the received signal is obtained. For cellular telephone signal reception, the signal is sent to amplifier 1224 and filter 1228 via filter 1222 and conductor 1226.

The output of cellular filter 1228 is provided to mixer circuit 1230 (or simply mixer) via switch 1212 connected to terminal "a". The mixer 1230 is supplied by the local oscillator 1233.
It is activated by a cellular mixing frequency of 80-800 MHz.

The output of the mixer 1230 is supplied to the first and second intermediate frequency circuits 1235 and 1236. These intermediate frequency circuits 1235 and 1236 operate in the 45 MHz and 455 kHz frequency ranges, respectively, and provide the baseband signal output via conductor 1237 connected to the detector circuit.

The transmission of the outgoing radiotelephone signal is performed by the lead wire input unit 1.
Starting with the wideband signal applied to 250. The signal to be transmitted at the cellular frequency is fed through the switch 1215 connected to the terminal "a" to the oscillator 125 for the carrier wave.
2 is supplied. The modulated carrier signal output from the oscillator 1252 is output via the switch 1214 connected to the terminal “a” and the amplifier 1254 and the switch 1211 connected to the terminal “a” to the output filter 12 of the double arrangement.
Sent to 23. The output of the filter 1223 is connected to the antenna 1221 via the switch 1210 connected to the terminal “a”.

The outgoing radiotelephone signal in the ISM frequency band (cordless) is connected to the oscillator 1262 via the switch 1215 connected to the terminal "b" from the lead wire input section 1250. The oscillator 1262 supplies a carrier frequency signal in the ISM frequency band (cordless). Oscillator 1262
The modulated carrier signal output from is connected to amplifier 1254 via switch 1214 connected to terminal "b". The amplifier output is an ISM frequency band output filter 1273 and a switch 1210 connected to terminal "b".
And the antenna 1221 from this terminal.

In run mode, the incoming ISM (cordless) frequency signal in the 2475 MHz band is transmitted to node 12
It is directly connected to the ISM filter 1281 via 80. The output of the filter 1281 is connected to the mixer 1283. Local oscillator 1233 provides the mixing frequency for mixer 1283. The output of local oscillator 1233 is applied to frequency doubler 1286, which doubles the signal frequency and provides it to filter 1287.

The output signal of the filter has a frequency of 1560 MHz and is applied to mixer 1283 as a local oscillator signal via conductor 1291. The mixed signal is
Connected to mixer 1230 via ISM filter 1275, amplifier 1276, and filter 1277 and processed as described above.

In the initialization mode, the incoming signal in the ISM band of 915 MHz band is transmitted from the antenna 1221.
It is sent to the switch 1216 through the switch 1210 connected to the “b” terminal and the ISM filter 1272.
For this frequency band, the switch is connected to the "b" terminal. The ISM signal is applied to ISM filter 1275 and from this filter to amplifier 1276.

The next ISM filter 1277 connects this signal to mixer 1230 via switch 1212 which is connected to the "b" terminal. The signal frequency of the oscillator 1252 is applied to the mixer 1230 via the switch 1213 connected to the “b” terminal as the local oscillation frequency. With this frequency, the voice and data signals are 45
Frequency reduced to MHz band, intermediate frequency circuit 1235
Applied to.

When switches 1216 and 1217 are connected to the "initialize" terminal, the base station transceiver can be initialized. This connection allows the transceivers to be tuned to operate in different frequency ranges, so that the controller 1201 can investigate the radio channels used by neighboring base stations and select and use the least vacant one. it can.

As is apparent to those skilled in the art, the oscillator 1
252 operates as both a carrier signal oscillator and a mixed frequency oscillator. This configuration has the advantage of increasing the economics of the transceiver because the number of components can be limited.

The base station of the cordless system is a cellular telephone frequency band (825-890 MHz or 900 MH).
z band) and the ISM frequency band (2400 MHz band). The ready-to-use operating frequency band is under the command of an embedded program driven by the current operating parameters. This includes handset mode monitoring commands from the active handset.

In the receiving section, a common intermediate frequency (45 MHz) is selected so as to handle all the bands. The base station is tuned to each uplink frequency (handheld transmission frequency) in addition to each downlink channel of cellular and ISM to enable automatic allocation of cordless base station frequencies (control channel and voice channel) Let

To select the appropriate operating frequency, the cordless base station surveys all available channels for indications of potentially jamming channels. When idle (not in use), the signal strength of the available channels is measured and the channel with the lowest signal strength or interference level is the best channel for future use.

Upon completion of channel selection, the cordless base station begins sending a downlink control channel message announcing the availability of service to the handsets that are operational and have a valid ID. The handset acknowledges this message and activates the visual service indicator for the subscriber.

The cordless base station sends a paging message to determine the presence of the handset within its coverage area. This operation is shown in the flowchart of FIG. The process begins with initialization at block 1301. At block 1303, the instruction causes the system ID to be read from memory. The instruction causes the control channel message to be forward transmitted at block 1305.

At the next decision block 1307, the instruction checks to see if a call is detected on a wired line to the base station (such as a public telephone network). This instruction is executed cyclically until a call is detected. When a call is detected, the next instruction in block 1309 declares an "off-hook" condition on the wireline. At block 1311, the instruction retrieves the ID of the called party intended for the call from the learned ID list, and at block 1313 the instruction sends a paging message on the forward control channel.

At decision block 1315, the instruction checks to see if a response to the call from the handset (call response) has been received. If a call response is received, the process proceeds to block 1317.
Proceed to and the command issues a voice channel assignment. This response places the call in progress, as indicated by block 1319.

If the call is not answered, the process proceeds to block 1321 where the instruction increments the index to select the next ID in the list, and in the next decision block 1323, the list ID. Is checked to see if it has been exhausted. If not, the next ID on the list is retrieved and the process returns to the input of block 1311.

If the list of IDs has been exhausted, the process proceeds to block 1325 which either sends an "unreachable callee" announcement to the wired line or at the next block 1327. According to the command, a message is recorded as an answer machine function. At block 1329, the command causes the wired line to go "on hook" and the process returns to the input of decision block 1307 to wait for another call from the public telephone network.

The handset is also capable of making a call to the public telephone network via the base station using the process described below based on the flow chart of FIG.

The process of FIG. 14 begins with the initialization at block 1401. At block 1402, the instruction causes the system ID to be read from memory. The instructions cause a forward control message or a downlink control message to be broadcast or transmitted at block 1403. This message is monitored by all handsets in this coverage area.

Then, in decision block 1405, the instruction checks to see if a transmit-related preceding signal has been received. If the check result is positive, block 1407.
At that instruction, the busy / idle (in use / empty) bit state contained in the memory is changed by the instruction. At the next decision block 1409 it is checked whether a complete call signal has been received.

If the result is affirmative, the process proceeds to block 1413 and the instruction retrieves the telephone number and electronic serial number from the calling handset. These items are compared to the valid list that had been learned before they were included in the base station memory. If at decision block 1415 it is determined that these items match the list and are valid and genuine, then at block 1417 the instructions cause the base station to issue a voice channel assignment.

Next, in block 1409, the instruction sets the timer to 10 seconds so that the channel switch time will follow. This length of time is chosen to be less than the 15 seconds programmed into the handset as described above. Block 1421
At that instruction, the wired line is put into the "off-hook" state, and the next decision block 1423 checks to see if a dial tone has been received.

If a dial tone is received, the command at block 1425 causes a touch tone dial tone to be placed and the call to proceed as shown in the next block 1427.

If no dial tone is received, the instruction at decision block 1437 checks to see if the 10 second timer set time has expired. If not, the program returns to decision block 1423. If yes, program is block 1
Proceeding to 439, the command issues a forward voice channel recommand command.

In the next block 1441, the command issues a signal to forcibly disconnect from the voice channel, and in block 1443 the command puts the wired line into the "on-hook" state. The process then returns to block 1403 to wait for another call from the handset.

Returning to decision block 1415, if these telephone number and electronic sequence number entries do not match the list, the process proceeds to block 1429 where the instruction increments the index in the list and decision block 1431.
It is checked whether the ID list learned at is exhausted.

If the list has not been exhausted, the process returns to the input of decision block 1415.
If the list has been exhausted, the process proceeds to block 1435 where the instruction reissues the forward control channel recommand command. The process then returns to block 1403 to wait for another call from the handset.

FIG. 15 shows a channel switching procedure from local to cellular of the cordless base station. Block 1
As indicated by 501, assume that a call is in progress and channel switching is recommended. Decision block 1503
At, it is checked whether a request by flash signal (flash request) has been received from the handset. If not, the process cycles around block 1503.

If a flush request has been received, the next decision block 1505 checks to see if a channel switch request code has been received. If a channel switch request code has not been received, the process proceeds to block 1507, which causes a reorder tone to be issued, and the process to block 15.
Return to 01.

If a channel switch request code has been received, the process proceeds to block 1509, which instructs the timer to be set to 30 seconds. with this,
A time frame is set during which channel switching should be completed.

In block 1511, the command causes a flash signal to be sent to the wire line. At the next decision block 1513, it is checked whether a dial tone has been received. This command is executed cyclically until a dial tone is received. Next block 151
At 5 the instruction causes the cellular number of the handset to be retrieved from memory. The instruction at block 1517 causes the call to be transferred over the wired line to the cellular number of the handset.

At the next decision block 1521, it is checked whether a signaling tone has been received from the handset. If not, next decision block 1
At 519, it is checked if the timer set time of 30 seconds has elapsed. If 30 seconds has not elapsed, the process returns to the input of decision block 1521.
If 30 seconds has elapsed, the process proceeds to decision block 1525 (decision block 1525 is described below).

If, in decision block 1521, it is determined that a signal tone has been received from the handset, the process proceeds to block 1523, which causes the transmission on the voice channel to stop. Next block 1527
At that command, the wired line is put into the "on-hook" state. In the next block 1529,
The initialization state is shown.

In decision block 1519, it is determined in the decision block 1519 that the timer setting time of 30 seconds has elapsed, and the process proceeds to the decision block 1525.
It is checked if the supervisory audio tone (SAT) is still active. If not, the process proceeds to block 1523 and thereafter proceeds as described above.

If the supervisory audio tone is still active, the process proceeds to block 1531 which instructs the wired line to be put in an "on-hook" state. The process then proceeds to block 150 which indicates that the call is in progress.
Return to 1.

Although the radio transmission medium interface is constructed as an example in the system described above, the principle of the present invention is that the TDMA (time division multiple access) system or its system finally connected to the public telephone network. It should be noted that the invention is also applicable to digital radio transmission media interfaces such as variants, private branch exchanges (PBXs), various variants including key systems, and other telecommunication interfaces.

That is, the above description relates to one embodiment of the present invention, and those skilled in the art can think of various modified examples of the present invention, but all of them are the techniques of the present invention. It is included in the target range.

The reference numerals in the claims are for the purpose of easy understanding of the invention and should not be construed to limit the technical scope thereof.

[0164]

As described above, according to the present invention, a special relationship is provided between frequency bands used in both wide area (cellular) and local (cordless) communication systems in a radiotelephone mobile communication system. Thus, both cellular and cordless communication systems were constructed with a base station and multiple integrated radiotelephone handsets with a common baseband circuit and a single antenna.

Therefore, in the conventional technology, the cellular phone and the cordless mobile phone can be integrated by simply combining the individual handset units including the antennas, respectively. According to the present invention, the circuit for both systems of the handset is integrated and the device is unified, while the device is economical. Will be improved. This also applies to the base station. or,
Channel switching between service areas can be streamlined,
Radio telephone mobile communication operational efficiency is improved.

[Brief description of drawings]

FIG. 1 is a schematic diagram illustrating a wireless telephone system having two separate radio transmission medium interface systems with a wide area and a local area serving respectively.

FIG. 2 is a graph illustrating a representative frequency spectrum supporting separate radio transmission medium interfaces for wide area and local area.

3 is a schematic diagram illustrating a mobile radiotelephone handset operating for both radio transmission medium interfaces in the radiotelephone system shown in FIGS. 1 and 2. FIG.

FIG. 4 is a flow chart describing details of the operation of the wireless telephone handset of FIG. 3 in conjunction with FIGS. 5-9.

FIG. 5 is a flow chart illustrating details of operation of the wireless telephone handset of FIG. 3 in conjunction with FIGS. 4 and 6-9.

FIG. 6 is a flow chart illustrating details of operation of the wireless telephone handset of FIG. 3 in conjunction with FIGS. 4, 5 and 7-9.

FIG. 7 is a flow chart describing details of operation of the wireless telephone handset of FIG. 3 in conjunction with FIGS. 4-6, 8 and 9.

FIG. 8 is a flowchart for explaining the details of the operation of the wireless telephone handset of FIG. 3 together with FIGS. 4 to 7 and FIG.

FIG. 9 is a flow chart illustrating details of the operation of the wireless telephone handset of FIG. 3 in conjunction with FIGS.

FIG. 10 is an explanatory diagram showing a mutual relationship between FIG. 6 and FIG. 7.

11 is an explanatory diagram showing a mutual relationship between FIG. 8 and FIG. 9. FIG.

12 is a schematic diagram of a transceiver provided in a cellular or cordless base station operative to communicate with the handset of FIG.

FIG. 13 is a flow chart illustrating details of operation of the base station transceiver of FIG. 12 in conjunction with FIGS. 14 and 15.

FIG. 14 is a flow chart describing details of the operation of the base station transceiver of FIG. 12 in conjunction with FIGS. 13 and 15.

FIG. 15 is a flow chart illustrating details of operation of the base station transceiver of FIG. 12 in conjunction with FIGS. 13 and 14.

[Explanation of symbols]

101 public telephone network 102, 105 trunk (relay line) 103 mobile switching center 104 cellular telephone base station 107 wireless telephone handset 115 cordless telephone base station 201, 202, 203, 204, 205, 206, 2
07, 208 Frequency band 301 Cellular / 900 MHz band cordless signal receiver 302 Cellular signal transmitter 303 2.4 GHz band cordless signal transmitter 304 User interface (display etc.) 305 Audio processing circuit 306 Bus 307 Microcomputer 308 Monitoring audio frequency Tone (SAT) processing circuit 309 Modem 311 Battery 312 Power supply device 322 Second mixer 323 First intermediate frequency circuit 324 First mixer 325 Reference oscillator (local oscillator) 326 Second intermediate frequency circuit 327 Low noise linear amplifier 328 Cellular / ISM bandpass filters 331,353 High frequency amplifiers 332,383 Power level controller 333 Cellular / ISM input bandpass filter 335 ISM bandstop filter 336 High frequency switches 340,341 Synth Sizer circuit 351 Transmitter unit 354 Divider circuit 355, 356, 357 High frequency power amplifier 358 Cellular transmission band filter 361 Frequency tripler 363, 365 ISM band filter 364 Power amplifier 366 Series LC resonance filter 382 Antenna 1201 Controller 1210 1217 Switch 1221 Antenna 1222, 1223, 1228 Cellular Filter 1224, 1254, 1276 Amplifier 1226, 1237, 1291 Conductor 1230, 1283 Mixer Circuit 1233 Local Oscillator 1235, 1236 Intermediate Frequency Circuit 1250 Conductor Input 1252 Oscillator (for Cellular) 1262 Oscillator (For ISM (cordless)) 1280 nodes 1272, 1273, 1275, 1277, 1281,
1287 ISM Filter 1286 Frequency Doubler

Continued front page    (72) Inventor Jesse Jügen Russell             United States, 08854 New Jersey             ー, Piscataway, Tams Avenue               Two (72) Inventor Robert Edward Schroeder             United States, 07045 New Jersey             ー, Montville, Lennox Court 18 (72) Inventor Robert Raymond Miller Third             United States, 07960 New Jersey             ー, Convent Station, Blood             Ray Road 12 F term (reference) 5K067 AA21 AA34 BB04 BB08 BB21                       DD17 DD27 DD51 EE04 EE10                       EE32 EE61 FF02 GG01 GG11                       HH05 HH22 HH24 KK01 KK13                       KK15

Claims (6)

[Claims] 1. A general-purpose wireless telephone mobile communication method for selectively operating a mobile telephone subscriber's handset in a wide area service system and a local area service system, the method comprising: (A) turning on a power source; An initialization step of initializing a mobile radiotelephone by determining an available service of a local area service and a wide area area service; and (A) the initialization step of: (A1) the local area And (A2) if the local area service is not enabled, the step of investigating whether the wide area service is enabled is included. And (B) a single filter including a filter for rejecting radio signals relating to the local area service. Using the end circuit,
Receiving a wireless signal, (C) matching the received wireless signal (hereinafter, received wireless signal) to the available system for a valid system identifier, and (D) using the available system. Establishing an active call state, the received wireless signal bypassing the filter to include a signal for the local area service and the wide area service if the local area service is enabled. A general-purpose wireless telephone mobile communication method, wherein the received wireless signal is processed by a filter to include only a signal related to the wide area service when the local area service is not enabled. 2. The method further comprises the step of (E) transferring the service from the local area service to the wide area service by a channel switching operation, wherein the (E) step comprises: (E1) reducing the signal strength of the ongoing call. Detecting, (E2) giving a notification to the handset user about upcoming channel switching, and (E3) obtaining a wide area service setup channel while continuing communication with a local area service regional station. And (E4) detecting a call signal from a regional station of wide area service and transmitting a call response signal from the handset, and (E5) a voice channel in the wide area service system. And assign the handset to this Tuned to the channel.
the method of. 3. The method further comprises: (F) transferring the service from the wide area service to the local area service by a channel switching operation, wherein the (F) step tunes the handset to the local area service setup channel. And (F2) determining whether the handset has a valid system identifier, (F3) issuing a notification about channel switching, and (F4) sending a ringing signal from a regional station of the local regional service. Detecting and emitting a call response signal from the handset; and (F5) assigning a voice channel in a local area service system and tuning the handset to this channel. the method of . 4. The method further comprises: (G) enabling the transfer of services from a local area service to a wide area service, the (G) step comprising: (G1) the handset of a local area service base station. Indicating that it is leaving coverage by means of a display mechanism on the handset, and (G2) responsive to user input to enable channel switching, moving the handset from a local area service base station to a wide area Initiating a channel switching process for relocating the service to the base station. 5. The method further comprises the step of: (H) recording a message used to signal that a communication connection for establishing a call from the base station to the designated subscriber's handset is unavailable. Claim 1 characterized by the above-mentioned.
the method of. 6. The method further comprises the step of: (I) recording a caller's message following the notification that a communication connection is not available for the subscriber to hear when the handset is next activated. The method of claim 5, wherein: