JP2588501B2 - Communication method and apparatus between main body of cordless telephone and handset - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

FIELD OF THE INVENTION The present invention relates to cordless telephones and, more particularly, to an apparatus and method for use in cordless telephones that automatically changes the frequency hop sequence in the presence of interference.

[0002]

2. Description of the Related Art Recent rules in the United States have now increased the spectrum utilization of cordless telephones. Frequency hop systems increase their energy by changing, or hopping, the center frequency of transmission many times per second according to a pseudo random occurrence list of communication channels. The result is a much higher signal-to-noise ratio than can be achieved with prior art techniques such as amplitude modulation without the use of extended bands.

[0003] These recent rules provide general guidance on how cordless telephones operate in an extended spectrum system. The rule, however, does not provide any particular guidance on the standards required for consistent operation of these cordless phones. Since these criteria for determining the organization of cordless telephones intended for extended spectrum operation have not yet been adopted, cordless telephones operating with different extended spectrum organization within the designated frequency band for this operation There is a possibility of interference between them. For example, two frequency hop phones may be organized such that frequencies hop at different speeds.

In fact, given the currently available guidance on the organization of these telephones, one telephone may hop at twice the speed of the other telephone. Thus, if two cordless telephones hopping at different speeds and operating within range of each other by chance appear simultaneously on the same channel, there is a potential for interference between the two telephones. I do. This interference distorts the information at a minimum, and in the worst case, the handset,
Synchronization between the remote unit and one, and possibly both, of these cordless telephones may be out of sync. This interference can continue as both cordless telephones continue to hop to this channel and, possibly, simultaneously to other common channels and appear on this channel.

Another source of interference for cordless telephones operating in frequency hop systems is noise or other signals that appear continuously on the channel hopped by the cordless telephone. This type of interference continues to interfere with the cordless telephone every time it hops to this channel.

As the use of cordless telephones configured for frequency hop operation increases, the interference of such telephones is possible because other telephones are simultaneously in the same channel within the coverage of such telephones. Sex increases. Noise or interference from other signals appearing on the channel in use by frequency hop phones can also adversely affect the operation of these phones.

[0007]

Accordingly, it is an object of the present invention to minimize the interference that one cordless telephone receives from another cordless telephone and from noise and other signals while operating in a frequency hop system. That is.

[0008]

SUMMARY OF THE INVENTION In accordance with the invention, a cordless telephone configured to operate in a frequency hop system, when there is interference detected on a particular communication channel, communicates with the handset of the cordless telephone. , An apparatus for automatically selecting and replacing other communication channels to eliminate this interference without disrupting communication between the associated bodies.

In accordance with a feature of the present invention, either the handset or the body receives a signal between itself and its associated unit on each of a first group of predetermined communication channels used in communication during a frequency hop cycle. Determine the quality of communication. The quality of this signaling is determined by measuring the level of interference occurring in each of the first group of channels.

According to another feature of the present invention, the cordless telephone selects a channel from a second group of predetermined communication channels. Each channel selected from this second group of communication channels is used instead of one of the first group of channels in which interference was detected during the frequency hop cycle.

Once the handset or handset has communicated to the other that a channel change is required, the handset selects an appropriate number of channels from the second group of channels through a process recognized by the handset. Inform the handset of this other channel information. Once this information is communicated and recognized, both the body and the handset insert another communication channel within the frequency hop cycle in place of those communication channels for which interference was detected.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now to FIG. 1, there is shown a general block diagram of a particular circuit of a cordless telephone. The cordless telephone automatically selects another communication channel in response to interference, such as noise or other signal sources, detected on a particular busy communication channel. As shown, a cordless telephone typically has a body (base unit) 10 and a handset (handset unit) 20, both of which can operate over multiple communication channels in a frequency hop system. It is.

An overview of extended spectrum techniques with frequency hop systems is given in C. Dixon
"Spread Spectrum Systems (Sprea)
dSpectrum Systems ”, New York, John Wiley and Sons (John Wi)
Ray & Sons), 1984. The specific requirements of the frequency hop system that this cordless phone was designed to work on are Report and Order in General Docket (Repo).
rt and Order in General D
pocket) No. 89-354, this report and order was issued on July 14, 1990.
On the day, Federal Communications Commission
Commission), July 1990
It was abolished on March 9.

The main body 10 includes a control unit 110, 1)
Control unit 110, 2) time domain duplexer (TD)
D) 120 and 3) a clock 115 that provides synchronization to the combined digital / analog and analog / digital (D / A + A / D) converter 125. The main body 110 includes a radio frequency (RF) transceiver 130, a signal strength monitor circuit 135, an antenna 1
40 and a frequency synthesizer 150 are included. Body 10
The telephone circuit 160 includes a chip line 101 and a ring line 102.
To the central office or other suitable switch via
Connect.

The transceiver 130 includes an RF transmitter and an RF transmitter.
Has both receivers. Transceiver 130 demodulates the audio signal transmitted by handset 20 to obtain (D /
These signals are connected to the telephone circuit 160 via the D / A section of the (A + A / D) converter 125. Transceiver 130
Before being transmitted to the handset 20 by this transceiver 130, the speech signal and other signals from its telephone circuit 160 initially connected via the A / D section of the (D / A + A / D) converter 125 Receive a control signal. The telephone circuit 160 is used for signals on the tip line 101 and the ring line 102 and for the receiver 20 by the RF transceiver 130.
"Simple old telephone service" (PO
TS) interface. Finally, power circuit 170 provides operating power to all of the circuits in body 10.

The control unit 110 conveniently provides a number of control functions, but may include a read only memory (RO).
M), may be implemented through the use of a microcomputer including random access memory (RAM) and the use of appropriate coding. Such microcomputers are well known in the art and are available from Signatures (S
ignites), Intel and AM
D is readily available from semiconductor manufacturers.

The control unit 110 generates and stores security code data, from 902 MHz to 928 MHz.
With a first set of 52 data values corresponding to a first set of arbitrary channels and a second set of arbitrary channels selected from 173 possibly existing channels available in the frequency band of Also generates an arbitrary data list. This first set of 50 arbitrary channels is the Federal Communications Commissions General Docket (Fe
Deral Communication Commi
session's General Docket) N
o. Used during frequency hop cycles performed according to 89-354. The second set of two optional channels is used during an initialization process which will be described in more detail later herein.

According to the present invention, the control unit 110
A second group of, for example, ten data values, corresponding to a set of ten arbitrary channels, may also be generated in a pseudo-arbitrary manner. These channels may be selected from 173 channels available in a frequency band of 902 MHz to 928 MHz. During a frequency hop cycle, if interference is detected by the body or handset on the first set of channels of the first group, the affected body or handset initiates a channel change process whereby interference was detected. Channels are selected from the second group of channels instead of the channels of the first group of channels.

The safety code data is transmitted from the receiver 20 to the main unit 10.
Was generated while in the cradle, and on April 8, 1988, R.C. E. FIG. Anglikowski
ki) provided to the handset 20 according to the teachings of another issued U.S. Pat. No. 4,736,404. The safety code data stored in the control unit 110 is transmitted to the main unit 10 via a battery charging contact interface formed by contacts 201 and 202 located on the handset 20 and contacts 103 and 104 located on the body 10 that interface with 202. And the handset 20. The security code provided during the initialization process described later in this specification may be used during the time the handset 20 is positioned far from the body 10 and for subsequent opcodes between these units in ongoing communication. The transmission is performed while establishing the initial communication or call setup during the transmission.

Like the safety code data, the pseudo random generated data list is generated when the handset 20 is in the cradle of the main body 10. A data list containing a first group of 52 data values may also be transmitted between the main body 10 and the handset 20 via the battery charging contact interface during the initialization process. The second group of ten data values is stored in the body 20 as needed, as will be described in more detail below.

As will be apparent to those skilled in the art, without departing from the spirit and scope of the present invention, a pseudo-randomly generated data list
Alternatively, it can be generated by the handset 20 and transmitted to the body 10 via the battery charging contact interface during the initialization process. Similarly, obviously, without departing from the spirit and scope of the invention, a second group of data values may be generated,
Then, it can be held in the receiver 20. The data values of the first group and the second group are S.D. W. Golon
b), Digital Communications with Space Applications (Digital Com
munications With Space Ap
applications (Prentice Hall, NJ, 1964), pages 7-15.

The control unit 110 also controls the TDD 120. The pseudo random occurrence data list from the control unit 110 is provided to the TDD storing this list. The TDD 120 may, when appropriate, use the frequency synthesizer 150
To control the frequency selected in the frequency hop cycle of the body 10 by entering the stored value into the data list generated by the control unit 110. TD
D120 also regenerates frequency synthesizer 150 as frequency synthesizer 150 progresses through the frequency hop cycle.

In order for the body 10 to achieve effective service over its operating range, the signal strength monitoring circuit 135
Monitors the strength of the signal received from the handset 20 continuously while the communication with the handset 20 is in progress. The signal strength monitoring circuit 135 is, for example, a received signal strength indicator (RSSI).
It may be. This RSSI generates an output voltage proportional to the strength of the signal received from the handset 20.

In response to the strength of the received signal from handset 20 determined by signal strength monitoring circuit 135, control unit 110 causes handset 20 to transmit RF transceiver 13
0 controls the amount of power transmitted. Thus, when handset 20 is close to body 10, the power level emitted by RF transceiver 130 is reduced to a minimum acceptable level. When the handset 20 is limited to be located near the limit of the telephone's operating range, RF
The power level emitted by transceiver 130 is increased to its maximum allowable level.

Next, regarding the receiver 20, the components of the receiver 20 are a control unit 210, a timer 21
2, 1) a control unit 210, 2) a time domain duplexer (TDD) 220, 3) a clock 215 for synchronizing the digital-analog and analog-digital (D / A + A / D) converter 225 to be combined. doing. In addition, the handset 20 includes an RF transceiver 230,
A signal strength monitoring circuit 235, an antenna 240, and a frequency synthesizer 250 are included.

The telephone circuit and keypad 260 allow dialing of telephone numbers, and allow selection of functions such as telephone call, intercom and page mode of the handset 20 for communication with the main unit 10. Battery 270 provides operating power to all circuits within handset 20. This battery is charged by the power circuit 170 via the charging contact interfaces 103, 104 and 201, 206 formed when the handset 20 is placed on the cradle of the main body 10.

Transceiver 230 includes an RF transmitter and R
It has both F receivers. This transceiver 230
Demodulates the audio signal transmitted by the main body 10, and (D
/ A + A / D) D / A section of converter 225 and hybrid section 28
3 to the loudspeaker 281. Transceiver 230 receives as input this transceiver 2
30 has an analog speech signal from a microphone 282 that transmits to the body 10. These analog speech signals are connected to the transceiver 230 via the hybrid unit 283 and the A / D unit of the (D / A + A / D) converter 225.

The (D / A + A / D) converter converts the analog signal into a digital signal provided to the RF transceiver 230. Conventional amplifiers 284 and 285
Is used to amplify the analog speech signal obtained from the microphone 282 and provided to the loudspeaker 281, respectively. Signal strength monitor 235
Monitors the level of the received signal from the body 10 and therefore
In proportion to the received signal level, the RF transceiver 230
Changes the level of output power radiated by.

The initialization process is a process for setting the handset 20 to communicate with the main unit 10 and is performed when the handset 20 is placed on the cradle of the main unit 10. In the telephone circuit and the keypad section 260, the handset 2
Cradle detector for detecting when 0 is inserted (not shown)
It is included. The cradle detector also sends a signal to the control unit 210 whenever the handset 20 is inserted into the cradle.

During this initialization process, the control unit 210
Interfaces with the control unit 10 of the main body 10 and communicates with the control unit. As part of this communication, the control unit 210 receives the pseudo random occurrence data list and the safety code data from the control unit 110 via the charging contact interfaces 103, 104 and 201, 202. Once this data is received, control unit 210 confirms receipt of this data by echoing back this same data to body 10 via the charging contact interface.

Any communication between the body 10 and the handset 20 must involve a security code shared between them. During the establishment of initial communication between handset 20 and body 10 initiated by body 10, control unit 210
Must be able to make a first comparison between the received secure code data and all stored code data.

Similarly, the first comparison of the data from these two security codes is based on the call set-up request from the handset.
Must be made by the control unit 110 to respond. Like the control unit 10, the control unit 210 may be executed by using a microcomputer including ROM and RAM, and by using an appropriate encoding process. Such microcomputers are well known in the art and are readily available from semiconductor manufacturers such as Signatures, Intel and AMD.

The receiver 20 is not used for communication, and
While positioned away from the handset, the handset 10
A low power monitoring mode is entered which involves reducing and then increasing the power to a particular minimum circuit of the handset 20 as needed for satisfactory operation. Reducing the on-time state of this circuit when communication is not progressing between the handset 20 and the body 10 will contribute to saving battery power.

The other circuit of the receiver 20 is the receiver 2
0 is completely off while in this monitoring mode. If the power supply to the handset 20 is to be reduced, the control unit 210 will turn itself off or go to sleep, and will signal the TDD 220 to turn off while in this power down state. Before turning off this TDD22
0 activates the timer 212. This timer 220
For example, it has a one-shot monostable multivibrator and turns off all other clocked circuits of the handset 20.

After about 30 milliseconds, handset 20 is powered up for a minimum of 40 milliseconds to a minimum power operating state. This state change occurs at the end of 360 msec.
2 from the pulse supplied to TDD 220. The TDD 220 is then enabled so that an RF signal is being transmitted from the body 10,
Alternatively, the control unit 210 determines whether the key is pressed on the keypad of the handset 20 by using the clock 21.
5 and the receiving part of the transceiver 230 are turned on.

If neither of these has occurred, control unit 210 again turns off power to itself and TDD 220 and the cycle is repeated. This low power monitoring mode continues as long as no RF signal is received from the body 10 or a key is not pressed on the keyboard.

When an RF signal is received from the body 10, the RF signal is connected to a control unit 210, which increases the power supplied to the handset 20 to its minimum power operating state by 40 millimeters. Search for the initialization synchronization pattern of the signal within seconds. If the received initialization synchronization pattern does not include a security code recognized by handset 20, control unit 210 shuts itself down and power to TDD 220.

The initialization synchronization pattern is transmitted to the receiver 20
If it does not include the safety code recognized by
By the control unit 210, this low power monitoring mode
Disabled. If so, the control unit 210
Keeps the TDD 220 operable beyond its normal ON time to achieve reception and synchronization of the RF signal from the body 20 to establish reception and synchronization of the RF signal from the body 20. The low power monitoring mode of the handset 20 is by pressing a particular key on the keyboard and so that the exchange of data between the handset 20 and the body 10 takes place via the intervening battery charging contact interface, and
When the handset 20 is placed on the cradle of the main body 10, it is stopped.

Communication between the body 10 and the handset 20 occurs within a time period designated as a transmission frame. In the frame, the main body 10 and the receiver 20 both communicate with each other. A typical transmission frame may be, for example, five milliseconds long and include about 500 bits of information time slot. In operation, the body 1
0 is typically the first half of each frame, ie
It is set up to transmit within 2.5 milliseconds and to receive a signal from handset 20 transmitting on the same frequency during the other half of each frame, ie, 2.5 milliseconds. .

The receiver 20 operates in a complementary manner to the body 10 as it receives the first half of each frame and is again set to transmit on the other half of each frame. The transmission of this periodic frame takes about 40
Transmitting 80 frames in 0 milliseconds, body 10 and handset 20 both transmit on each of the 50 communication channels.

Both body 10 and handset 20 may initiate a call with each other. As mentioned above, channels 50, 51 of the first group of channels are channels used to initiate communication between main body 10 and handset 20.
When body 10 initiates a call to handset 20, body 10 sends an initialization synchronization pattern for channel 51 in the first half of each frame for 400 milliseconds.

When handset 20 initiates a call to body 10, handset 20 sends this same initialization synchronization pattern on channel 51 for a period of 120 milliseconds equal to another portion of each frame. I will. The synchronization pattern includes a security code, a Barker code, and a dot sequence signal with a period during which no information is transmitted as described below.

This dot sequence signal is transmitted to the receiver 2
And a series of ones and zeros provided to enable the body 10 to operate and adjust the phase of its received clock to the phase of the clock that provides the input signal. When these clocks are in phase, handset 20 can read the security and Barker codes following the dot sequence signal at the appropriate bit boundaries.

In order to communicate with the receiver 20, the main unit 10
Sends a 198-bit dot sequence code with a security code. This security code is a 16-bit random number generated by the body 10 and, as previously shown, the receiver 20
Is transmitted to the control unit 210 in the handset 20 via the battery charging contacts while in the cradle of the body 10. This shared security code protects the handset 20 from other bodies that are suddenly synchronized with the handset 20.

The security code is accompanied by a Barker code in the initialization synchronization pattern. The Barker code is a fixed, predetermined 8-bit pattern that provides a position reference within the frame to match the frame clock of the receiver of handset 20 with the frame clock of the transmitter of body 10. This allows the handset 20 to re-establish frame synchronization or frame phase with the body 10 after being turned off during the handset's low power operation monitoring mode. When mated with the handset 20, the frame clock of the receiver of the body 10 must likewise be matched with the frame clock of the transmitter of the handset 20.

After the body 10 transmits the security code and the Barker code in the initialization synchronization pattern, further information is
It is not transmitted by the body 10 in each frame for a time period equal to 30 bits. For example, handset 2
A delay is provided in that time period to cause certain internal processing, including re-setting of the frequency synthesizer 150 to receive the initialization synchronization pattern from zero.

Once the frame positions of the transmitter of the main unit 10 and the receiver of the receiver 20 are matched, once the receiver 20
Synchronization is established. Similarly, by matching the frame positions of the receiver of body 10 and the transmitter of handset 20, synchronization of body 10 is also established.

During the communication, according to the present invention, the main body 10
Either or the handset 20 can determine the signal traffic between itself and its associated unit on each of the first group of predetermined communication channels used during the frequency hop cycle. . This is because these bodies 10
And each of the handsets 20 examines a set of received parameters contained in the received signal and achieves this by comparing the set of received parameters with a common set of stored parameters contained in both of these units. Is done.

The first comparison between the received parameters and the stored parameters indicates good quality signal communication, and the second comparison between these two parameters indicates poor quality signal communication. In particular, this quality of signaling is determined by providing the magnitude of the number of security code bits and Barker code bits received incorrectly in a frame, either at the body 10 or the handset 20.

The TDD 120 of the main body 10 and the T
Both DDs 220 are configured to detect and compare the received bits of the security code and Barker code received from each other on each channel. If these received bits are not received or if these bits received in the received timeslot reserved for these bits in the frame are different from the expected, the TDD receiving this discrepancy will A determination is made that the channel communicating with is being interfered because it contains noise or other unrecognizable signals.

The TDD receiving this signal informs its associated control unit that an interfering signal has appeared on this channel and that this channel should be monitored for the occurrence of this interference again. Let them know. The control unit stores, for example, each occurrence of interference on this channel up to 50 occurrences, and then the body 10 and the handset 20 remove this channel from the frequency hop cycle and select it from the second group of channels. Initiate a process that allows replacement with a channel.

FIG. 2 shows the receiver 20 or the main body 10.
A cordless telephone protocol indicating a particular process operable in either of the above is shown. This protocol responds to detected interference on the communication channel. The protocol begins at decision 203. In this determination, both the main body 10 and the receiver 20 separately check whether or not the safety code and the Barker code received on the channel X are correct.

If these codes are correctly received in this step, the protocol is activated. If these codes are not received correctly by either the handset 20 or the body 10, however, an error counter in the control unit of the associated handset 20 or the body 10 will cause the safety code and the Barker code to be received incorrectly. Step 20 every time
The count is advanced by one according to 4. The process then proceeds to decision 205 where all error counts for channel X are determined.

This error count is counted N (N
(E.g., equals 50), the protocol has proceeded to step 206. However, if the error count for channel X has not advanced to N, the protocol is activated. Each of the channels in the first set of communication channels of the first set is monitored in this manner for errors received in the security and Barker codes.

In the determination 206, the incorrect code is
It is determined whether it has been received at 0. If received, body 20 must be instructed to perform the channel change routines present in body 20. This routine will be described later with reference to FIGS. The protocol thus proceeds to step 204, where the handset 20 sends an opcode to the main unit 10 so that the main unit 10 performs a channel change routine to replace the other channel in the time slot occupied by channel X. Contact the body to do so.

From step 200, the protocol is activated and the body 10 initiates a channel change routine. If, at decision 206, the incorrect codes received were not present on the handset 20, these codes are
0, so the protocol also starts a body channel change routine from the NO branch of this determination.

Referring now to FIG. 3, there is shown a cordless telephone protocol which demonstrates the specific interaction between the main unit 10 and the handset 20 when implementing a channel change routine. The protocol starts at step 301. In this step, the body 10 sends the opcode to the handset 20 identifying the time slot in which the channel is to be changed. From step 301, the protocol proceeds to step 30
Proceeding to 2, the handset 20 confirms this time slot by sending back the mainframe 10 an opcode reflecting this time slot.

From step 302, the protocol proceeds to decision 303, where a replacement channel for replacement into the time slot identified by
To determine whether it is available. At step 303, if a replacement channel is not available at body 10, the protocol proceeds to step 305. If a replacement channel is not available on body 10, however, the protocol proceeds to step 304, where body 10 implements a pseudo-random routine, whereby body 10 generates a new list of subroutine channels, generally Generates 10.

The channels in this new list are necessarily different from those previously generated in the first and second groups of channels. The process of generating these two groups of channels is:
I mentioned earlier. As a request for a new replacement channel appears, the random number routine will generate a new channel in each subsequent list until all unused and available channels are exhausted. Once all available channels have been used, the random number routine reclaims previously used channels in an attempt to identify channels that are not interfered by noise or other signals. From step 304, the protocol proceeds to step 305.

In step 305, body 10 selects channel Y from this new list of replacement channels. The protocol then proceeds to step 306, where the body 10 sends an opcode indicating channel Y to the handset 20. The protocol then proceeds to step 307, where handset 20 sends an acknowledgment signal of channel Y back to body 10. From step 307, the protocol proceeds to step 308, where both body 10 and handset 20 remove channel X from this time slot and insert channel Y into this time slot. At step 308, the protocol ends.

FIG. 4 shows in more detail the specific aspects of the protocol shown in FIG. 3 for the operation of the channel change routine. Once the body 10 has made or is requested to change the channel in this time slot due to interference received in the time slot, the body 10 The handset 20 sends the representing opcode to the handset 20, and the handset 20 receives the opcode reflecting this time slot.

The handset then sends back an acknowledgment (ACK) signal containing the opcode of this time slot to the body 10. The body 10 then sends the new channel's opcode to the handset 20. The handset 20 then sends an ACK signal containing the new channel's opcode.
The main body 10 then sends the final ACK signal to the handset 20. After receiving this final ACK signal, both handset 20 and body 10 insert the new channel into the designated time slot and continue with the frequency hop routine that includes the new channel.

The above description relates to one embodiment of the present invention, and those skilled in the art can consider various modifications of the present invention, all of which are within the technical scope of the present invention. Is included.

[0064]

As described above, according to the present invention, while operating in a frequency hopping system, one cordless telephone minimizes interference received by other cordless telephones, as well as noise and other signals. Can be.

[Brief description of the drawings]

FIG. 1 is a functional block diagram of a cordless telephone body and handset operating in accordance with the principles of the present invention.

FIG. 2 shows a protocol of a cordless telephone showing specific processing in the body or handset of the cordless telephone in response to interference detected on a communication channel according to the present invention.

FIG. 3 shows a cordless telephone protocol showing a specific interaction between the body and the handset when implementing a channel change routine according to the invention.

FIG. 4 details certain aspects of the protocol shown in FIG. 3 for the operation of the channel change routine according to the present invention.

[Explanation of symbols]

 Reference Signs List 10 main unit (base unit) 20 receiver (handset unit) 101 chip 102 ring 110 control unit 115 clock 120 time domain duplexer 130 RF transceiver 135 signal strength monitoring circuit 150 frequency synthesizer 170 power circuit 210 control unit 212 timer 215 clock 220 time domain Duplexer 230 RF transceiver 235 Signal strength monitoring circuit 250 Frequency synthesizer 260 Telephone circuit keypad 270 Battery

 ──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Kenis W. Reland United States of America 08753 New Jersey Toms River Elevens Street 84 (72) Inventor William Jay. Neilon USA 07756 New Jersey Ocean Grove, Heck Avenue 81 (72) Inventor Hong Yu United States 07747 New Jersey Aberdeen, Irongate Lane 80 (56) References JP-A-3-58530 (JP, A) JP-A-3 -254239 (JP, A) JP-A-64-7825 (JP, A) JP-A-63-202144 (JP, A)

Claims (14)

(57) [Claims] 1. A method of communicating between a main unit (base unit) and a handset (handset unit) of a cordless telephone used in a frequency hop system, which can communicate via any of a plurality of communication channels, (A) detecting, within a plurality of communication channels, interference occurring during at least one of a first group of predetermined communication channels used for communication between the main body and the handset during a frequency hop cycle; Selecting) a communication channel from a second group of predetermined communication channels in the plurality of communication channels to replace each communication channel of the first group of predetermined communication channels in which interference was detected during the frequency hop cycle. Wherein said (A) detecting step comprises the step of:
Determining a traffic volume, wherein the determining step is performed during communication on each of the first group of predetermined communication channels.
For checking a set of reception parameters contained in the received signal.
Tsu have up, the amount of signal communication between the body and the handset, the pair
Reception parameters and a set of storage parameters in the handset and
The set of received parameters and the set of stored parameters
And a good comparison is shown, and a second comparison of these two sets of parameters shows interference
A method of communicating between a main body of a cordless telephone and a handset, wherein a malicious signal is included . 2. The method according to claim 1, wherein the set of reception parameters includes a security code and a Barker code included in the received signal. 3. The method of claim 1 further comprising the step of increasing a variable by each second comparison between the set of received parameters and the set of stored parameters. 4. In response to the predetermined number of increasing steps being performed, the selecting step includes the step of replacing one of the communication channels from the second group of channels to replace the first group of communication channels including interference. 4. The method of claim 3, wherein
The described method. 5. The method according to claim 5, further comprising the step of generating a second group of predetermined communication channels from the plurality of communication channels, the generating step further comprising: generating the second group of predetermined communication channels from the plurality of communication channels. 2. The method of claim 1, further comprising the step of pseudo-arbitrarily selecting the channels of: 6. Another channel selected from the plurality of communication channels by the generating step is a channel that was not previously selected and not included in the first group of predetermined communication channels, and is not previously selected, The method of claim 5, wherein the channels are not included in the two groups of predetermined communication channels. 7. The method of claim 1, wherein the generating step comprises a recycling step responsive to selecting all available channels from the plurality of communication channels, wherein the recycling step comprises selecting all of the available channels for reuse by the selecting step. 7. The method of claim 6, further comprising recycling previously used channels. 8. A body (10) and a handset (20) of a cordless telephone used in a frequency hop system that can communicate via any of a plurality of communication channels.
Detecting, in a plurality of communication channels, interference occurring during at least one of a first group of predetermined communication channels used for communication between the main body and the handset during a frequency hop cycle; Detecting means (120, 220) for detecting each of the first group of predetermined communication channels in which interference has been detected during the frequency hop cycle from a second group of predetermined communication channels in the plurality of communication channels. Selection means (110, 210) for selecting a communication channel, wherein the detection means determines the amount of signal communication between the main body and the handset.
Further comprising a decision hands stage determining, the determining means, at each predetermined communication channel of the first group
A set of reception parameters included in the signal received during communication
And a test means for checking the signal communication between the main body and the handset.
Parameters and a set of storage parameters in the handset and the body
The set of received parameters and the set of stored parameters
And a good comparison is shown, and a second comparison of these two sets of parameters shows interference
A communication device between the main body of the cordless telephone and the handset, wherein the communication device is provided with a malicious signal . 9. The apparatus according to claim 8, wherein the set of reception parameters includes a security code and a Barker code included in the received signal. 10. The apparatus of claim 9, further comprising counter means incremented after each second comparison between the set of received parameters and the set of stored parameters. 11. In response to the counter means reaching a predetermined number, the selecting means includes means for selecting one of the communication channels from the second group of channels to replace the first group of communication channels including interference. 11. The method of claim 10, wherein
The described device. 12. Generating means for generating a second group of predetermined communication channels from the plurality of communication channels, the generating means further comprising a second group of communication channels used in the second group of predetermined communication channels from the plurality of communication channels. Apparatus according to claim 8, further comprising the step of pseudo-arbitrarily selecting the channel of: 13. Another channel selected from the plurality of communication channels by the generating means is a channel that has not been previously selected and is not included in the first group of predetermined communication channels, and has not been previously selected, 13. The device according to claim 12, wherein the channels are not included in the two groups of predetermined communication channels. 14. Recycling means responsive to selecting all available channels from the plurality of communication channels, the recycling means being used by all previously used channels for reuse by the selecting means. 14. The apparatus according to claim 13, wherein the used channel is reproduced.