US 20090284345Al
`
`(19) United States
`(12) Patent Application Publication (10) Pub. No.: US 2009/0284345 A1
`Ghabra et al.
`(43) Pub. Date:
`NOV. 19, 2009
`
`(54)
`
`PASSIVE ENTRY SYSTEM FOR AN
`AUTOMOTIVE VEHICLE
`
`(75)
`
`Inventors:
`
`Riad Ghabra, Dearborn Heights,
`MI (US); Ehab Abdulla Tarmoom,
`Allen Park, MI (US)
`
`Correspondence Address:
`BROOKS KUSHMAN P.C. / LEAR CORPORA-
`TION
`1000 TOWN CENTER, TWENTY-SECOND
`FLOOR
`
`SOUTHFIELD, MI 48075-1238 (US)
`
`(73)
`
`Assignee:
`
`Lear Corporation, Southfield, Ml
`(IJS)
`
`(21)
`
`Appl. No.:
`
`12/120,967
`
`(22)
`
`Filed:
`
`May 15, 2008
`
`Publication Classification
`
`(51)
`
`Int. Cl.
`G05B 19/00
`G06F 7/00
`
`(2006.01)
`(2006.01)
`
`(52) U.S. Cl. ..................................................... .. 340/5.61
`
`(57)
`
`ABSTRACT
`
`A passive entry system for an automotive vehicle may include
`a token capable of receiving a plurality of wireless signals.
`The token may generate a response signal to at least one ofthe
`plurality of wireless signals and reconfigure so that the token
`does not provide a response to at least one of the plurality of
`wireless signals.
`
`Mmm-
`Connofler
`
`Mmm-
`Conhdbr
`
`ASSA1023
`
`1
`
`ASSA 1023
`
`

`
`Patent Application Publication
`
`Nov. 19, 2009 Sheet 1 of 2
`
`US 2009/0284345 A1
`
`Micro-
`Controller
`
`it
`
`Micro-
`Controller
`
`2
`
`

`
`Patent Application Publication
`
`Nov. 19, 2009 Sheet 2 of 2
`
`US 2009/0284345 A1
`
`PASE Module Initiates
`Polling Sequence
`
`
`
`46
`
`Fob _
`In Cabin
`?
`
`PASE Module Transmits
`Command to Disable
`Fob's Receiver Circuit
`
`
`
`
`
`
`Continue with Polling
`Sequence
`
`PASE Module Initiates
`Polling Sequence
`
`
`
`
`
`PASE Module Transmits
`Command to Alter
`Fob's Local Wake-Up ID
`
`
`
`
`
`
`Continue with Polling
`Sequence
`
`
`
`Continue with Polling
`Sequence
`
`
`
`PASE Module Transmits
`Command to Set Flag
`in Fob's Memory
`
`
`3
`
`

`
`US 2009/0284345 A1
`
`Nov. 19, 2009
`
`PASSIVE ENTRY SYSTEM FOR AN
`AUTOMOTIVE VEHICLE
`
`SUMMARY
`
`[0001] A passive entry system for an automotive vehicle
`having a cabin includes a control unit configured to broadcast
`a plurality of wake-up signals to prompt a token to power-up
`if the token is in a low-power consumption mode. The system
`also includes a token capable ofrecognizing at least one ofthe
`plurality of wake-up signals and of generating a response
`signal for the control unit in response to recognizing the at
`least one of the plurality of wake-up signals. The control unit
`is further configured to determine if the token is located in the
`cabin based on the response signal and to broadcast a recon-
`figuration signal to prompt the token to reconfigure so that the
`token does not recognize wake-up signals broadcast subse-
`quent to the reconfiguration signal ifthe token is located in the
`cabin.
`
`[0002] A passive entry system for an automotive vehicle
`having a cabin includes a control unit configured to broadcast
`a plurality of signals and a token capable of generating a
`response signal for the control unit based on one of the plu-
`rality of signals. The control unit is further configured to
`determine if the token is located in the cabin based on the
`
`response signal and to broadcast a reconfiguration signal to
`prompt the token to reconfigure so that the token does not
`generate the response signal to at least some signals broadcast
`by the control unit subsequent to the reconfiguration signal.
`[0003] A passive entry system for an automotive vehicle
`includes a token capable of receiving a plurality of wireless
`signals. The token is configured to determine if a predeter-
`mined number of wireless signals has been received, to gen-
`erate a response signal to at least one of the plurality of
`wireless signals if the number of received wireless signals is
`less than the predetermined number ofwireless signals, and to
`reconfigure so that the token does not provide a response to at
`least one of the plurality of wireless signals if the number of
`received wireless signals is greater than the predetermined
`number of wireless signals.
`[0004] While example embodiments in accordance with
`the invention are illustrated and disclosed, such disclosure
`should not be construed to limit the claims. It is anticipated
`that various modifications and alternative designs may be
`made without departing from the scope of the invention.
`
`BRIEF DESCRIPTION OF THE FIGURES
`
`FIG. 1 is a block diagram of an embodiment of a
`[0005]
`passive entry system;
`[0006]
`FIG. 2 is flow chart depicting an embodiment of a
`strategy for controlling the passive entry system of FIG. 1;
`[0007]
`FIG. 3 is a flow chart depicting another embodiment
`of a strategy for controlling the passive entry system of FIG.
`1; and
`FIG. 4 is a flow chart depicting yet another embodi-
`[0008]
`ment of a strategy for controlling the passive entry system of
`FIG. 1.
`
`DETAILED DESCRIPTION
`
`Passive start and entry (PASE) systems may unlock
`[0009]
`and start a vehicle without a key. Certain PASE systems
`communicate an inquiry signal to a token, such as a fob or
`card, carried by a user. The token, in response, transmits a
`confirmation signal. Doors of the vehicle may be unlocked
`
`and the vehicle may be started when the signal is confirmed.
`If the token becomes a predetermined distance away from the
`vehicle, the doors may be locked.
`[0010] Referring now to FIG. 1, an embodiment of a PASE
`module 10 of an automotive vehicle 12 may be configured to
`communicate with a token 14, e.g., fob, card, etc. The PASE
`module 10 includes a micro-controller 16 electrically coupled
`with a low frequency transmitter 18 and a high frequency
`receiver 20, e.g., a radio frequency receiver. Other configu-
`rations and arrangements are, of course, also possible. For
`example, the micro-controller 16 may be electrically coupled
`with a high frequency transmitter (not shown) and/or a low
`frequency receiver (not shown).
`[0011] As used herein the phrase “low frequency” typically
`refers to frequencies in the range of 3-300 KHZ. The phrase
`“high frequency” typically refers to frequencies in the range
`of300 MHZ-3 GHZ. Other ranges, however, are also possible.
`[0012]
`In the embodiment illustrated in FIG. 1, antennas
`22, 24 are electrically coupled with the low frequency trans-
`mitter 18. An antenna 26 is coupled with the radio frequency
`receiver 20. The position of the antennas 22, 24 within the
`vehicle 12 is known by the micro-controller 16. As discussed
`below, this position information may be used by the micro-
`controller 1 6 to determine the location ofthe fob 14 relative to
`
`the antennas 22, 24. For example, the antennas 22, 24 may
`respectively be positioned near a driver’s side door and pas-
`senger’s side door (not shown) ofthe vehicle 12. If each ofthe
`antennas 22, 24 detects the presence of the fob 14, the fob 14
`is likely in the cabin of the vehicle 12, i.e., the fob 14 is
`between the driver’s side door and passenger’s side door. In
`other embodiments, additional antennas (as well as additional
`receivers and/or transmitters) may be positioned throughout
`the vehicle to, inter alia, monitor additional regions of the
`vehicle 12, such as a trunk.
`[0013] The micro-controller 16 of FIG. 1 may be coupled
`with an engine system 28 and a door system 30. The micro-
`controller 16 may control/monitor the operation of the sys-
`tems 28, 30. For example, the micro-controller 16 may lock
`and unlock the door system 30 in response to receiving suit-
`able remote keyless entry commands. In other embodiments,
`the micro-controller 16 may be coupled with any suitable
`vehicle system to be controlled/monitored by the PASE mod-
`ule 10. For example, the micro-controller 16 may be electri-
`cally coupled with a lighting system or climate control sys-
`tem
`
`In the embodiment of FIG. 1, the fob 14 includes a
`[0014]
`micro-controller 32 electrically coupled with a low frequency
`receiver 34 and a high frequency transmitter 36, e.g., a radio
`frequency transmitter. In other embodiments, the micro-con-
`troller 32 may be electrically coupled with a high frequency
`receiver and/or a low frequency transmitter. Other configura-
`tions and arrangements are also possible. An energy storage
`unit 37, e.g., a 3V 240 mA~hr battery, capacitor, etc., supplies
`power to the micro-controller 32, low frequency receiver 34
`and high frequency transmitter 36. The low frequency
`receiver 34 may continuously draw power, e.g., 5 p.A, from
`the battery 37 while activated.
`[0015] An antenna 38 is electrically coupled with the low
`frequency receiver 34. An antenna 40 is electrically coupled
`with the radio frequency transmitter 36. In other embodi-
`ments, the fob 14 may include buttons and/or a display (not
`shown) associated with remote keyless entry functions such
`as door locking/unlocking and panic alarm as well as others.
`
`4
`
`

`
`US 2009/0284345 A1
`
`Nov. 19, 2009
`
`In the embodiment of FIG. 1, the low frequency
`[0016]
`receiver 34 of the fob 14 receives wake-up signals broadcast
`via the low frequency transmitter 18 of the PASE module 10.
`The wake-up signals prompt
`the micro-controller 34 to
`power-up from a low-power consumption mode in anticipa-
`tion of further communications and in advance of executing
`further code.
`
`[0017] An example passive entry sequence may begin
`when a door handle switch (not shown) ofthe door system 30
`generates a triggering pulse. This triggering pulse is provided
`to the micro-controller 16. In response to the triggering pulse,
`the micro-controller 16 generates a trigger generation func-
`tion. The low frequency transmitter 18 is activated to generate
`the low frequency wake-up signals, discussed above, associ-
`ated with the trigger generation function. The low frequency
`wake-up signals are broadcast via the antennas 22, 24. The
`low frequency wake-up signals respectively broadcast by the
`antennas 22, 24 may include information indicative of the
`antenna from which it was broadcast.
`
`[0018] As discussed above, the low frequency wake-up
`signals may facilitate locating the fob 14 relative to the anten-
`nas 22, 24. In some embodiments, the low frequency receiver
`34 includes suitable circuitry (not shown) for measuring a
`received signal strength indicator (RSSI) of each of the low
`frequency wake-up signals. The micro-controller 32 includes
`the RSSI information in a response sent to the PASE module
`10. The PASE module 10 determines which antenna is nearest
`
`the fob 14 based on the RSSI information. Locating the fob 14
`relative to the antennas 22, 24 may ensure that a user ofthe fob
`14 is located in the area where the passive function is being
`requested. For example, locating the fob 14 relative to the
`antennas 22, 24 may ensure that the user of the fob 14 is
`located outside the door system 30 when the door handle
`switch (not shown) is actuated. Likewise, locating the fob 14
`relative to the antennas 22, 24 may reveal that the fob 14 is
`located within the cabin of the vehicle 12. As discussed in
`
`detail below, various techniques may be employed to con-
`serve the life of the battery 37 when the micro-controller 16
`determines that the fob 14 is located within the cabin of the
`vehicle 12.
`
`In certain embodiments, the micro-controller 16
`[0019]
`generates a random number to be used as a seed number in a
`mathematical transformation that is also known by the micro-
`controller 32 as part of any suitable challenge/response vali-
`dation sequence. A challenge signal that includes information
`indicative of the random number may be broadcast from the
`PASE module 10. The fob 14 receives the challenge signal.
`The micro-controller 32 applies the mathematical transfor-
`mation to the random number. The transformed random num-
`ber, as well as the RSSI information discussed above and a fob
`identifier, are included in a response sent to the PASE module
`10. The micro-controller 16 may then check the fob identifier
`and the transformed random number to validate the fob 14.
`
`[0020] The PASE module 10, as discussed above, may per-
`mit, for example, a user to unlock and/or start the vehicle 12.
`In some embodiments, a touch sensor or button on a door (not
`shown) triggers the PASE module 10 to begin the interroga-
`tion process described above. In other embodiments, a user of
`the fob 14 need not press/touch the fob 14 to, for example,
`unlock and/or start the vehicle 12. Rather, the user simply
`needs to approach the vehicle 14. In such embodiments, the
`PASE module 10 may periodically transmit, as discussed
`above, a wireless signal, e.g., a polling signal, to check if any
`fobs are within a vicinity of the vehicle 12. An example
`
`message rate may be approximately once a second in order to
`trigger a fob of a user that is approaching the vehicle 12. Any
`fob within the communication range may respond, as dis-
`cussed above, to the polling signal. Thereafter, the PASE
`module 10 may initiate and complete the interrogation pro-
`cess described above before the user, for example, pulls a
`door handle (not shown).
`[0021]
`If the fob 14 is left, for example, in the cabin of the
`vehicle 12, it may frequently wake-up and respond to the
`polling signals described above. Such responses broadcast
`via the high frequency transmitter 36 may unnecessarily con-
`sume power from the battery 37. In some embodiments
`described herein, the low frequency receiver 34 may be dis-
`abled if it is determined that the fob 14 is located in the cabin
`
`of the vehicle 12. In other embodiments, the fob 14 may be
`reconfigured so that is does not respond to the polling signals.
`In still other embodiments, the fob 14 may be reconfigured so
`that it does not recognize the polling signals. Other configu-
`rations and arrangements are, of course, also possible.
`[0022] Referring now to FIGS. 1 and 2, the PASE module
`10 initiates the polling process when, for example, the engine
`system 28 is off as indicated at 42. As indicated at 46, the
`PASE module 10 determines if the fob 14 is located in the
`
`cabin of the vehicle 12. For example, the micro-controller 16
`may determine that the RSSI values associated with the
`response signal from the fob 14 detected by the antennas 22,
`24 are approximately equal. If no, the PASE module 10 con-
`tinues with the polling sequence as indicated at 48. If yes, the
`micro-controller 16 transmits a command to the fob 14 to
`
`prompt the fob 14 to disable the low frequency receiver 34 as
`indicated at 50. The strategy then proceeds to 48.
`[0023]
`In the embodiment of FIG. 2, the low frequency
`receiver 34 may be re-enabled if, for example, a button (not
`shown) on the fob 14 is pressed or the battery 37 is replaced.
`[0024] Returning again to FIG. 1, the fob 14 may, as intro-
`duced above, recognize the polling signals broadcast by the
`PASE module 10. For example, the fob 14 may store one or
`more identifiers that are compared with a corresponding iden-
`tifier embedded in the received polling signals. If the identi-
`fiers embedded in the polling signals match one of the stored
`identifiers, the fob 14 may recognize the polling signals.
`[0025]
`In some embodiments, the fob 14 may store a global
`identifier and a local identifier. The global identifier may be
`common to some or all fobs produced by a manufacturer of
`such fobs and may be used, for example, to test a batch of fobs
`produced by the manufacturer. Other uses, however, are also
`possible. The local identifier may be specific to a certain
`vehicle and may be broadcast, for example, via the polling
`signals. As such, fobs for different vehicles may have the
`same global identifier but different local identifiers.
`[0026] The fob 14 illustrated in FIG. 1 may store the local
`identifier in memory (not shown) associated with the low
`frequency receiver 34 (“receiver memory”) and memory (not
`shown) associated with the micro-controller 32 (“micro-con-
`troller memory”). The fob 14 may store the global identifier in
`the micro-controller memory. During an example recognition
`process, the fob 14 may compare the identifier embedded in
`the received polling signals against the copy of the local
`identifier stored in the receiver memory and the copy of the
`global identifier stored in the micro-controller memory. If the
`received identifiers match any of the aforementioned stored
`identifiers, the fob 14 recognizes the polling signals and pow-
`ers-up in anticipation of further communication, e.g., trans-
`mission of a response signal, data processing, etc. If the
`
`5
`
`

`
`US 2009/0284345 A1
`
`Nov. 19, 2009
`
`received identifiers do not match the stored identifiers, the fob
`14 does not recognize the polling signals.As apparent to those
`of ordinary skill, a greater amount of power from the battery
`37 is consumed if the fob 14 recognizes the polling signals
`because the fob 14 powers-up if it recognizes the polling
`signals.
`[0027] Referring now to FIGS. 1 and 3, the PASE module
`10 initiates a polling sequence including information indica-
`tive of the local identifier as indicated at 52. As indicated at
`54, the PASE module 10 determines ifthe fob 14 is located in
`the cabin of the vehicle 12. If no, the PASE module 10
`continues with the polling sequence as indicated at 56. If yes,
`the PASE module 10 transmits a command to the fob 14 to
`
`prompt the fob 14 to alter its local identifier stored in the
`receiver memory as indicated at 58. For example, the com-
`mand may prompt the micro-controller 32 to clear that por-
`tion of receiver memory storing the local identifier. The com-
`mand may also prompt the micro-controller 32 to increment,
`decrement or otherwise alter that portion ofreceiver memory.
`The strategy then proceeds to 56. The fob 14 will no longer
`recognize the polling sequence (and power-up) because the
`received local identifier will not match the altered local iden-
`tifier.
`
`In the embodiment of FIG. 3, the PASE module 10
`[0028]
`may transmit another command to prompt the fob 14 to copy
`the local identifier from the n1icro-controller memory into the
`receiver memory thus allowing the fob 14 to recognize
`received local identifiers. For example, as a result of a button
`press on the fob 14, vehicle activity and/or the battery 37
`being replaced (an example of a power on reset event), the
`PASE module 10 may poll the fob 14 with the global identifier
`to prompt the fob 14 to power-up. The PASE module 10 may
`then transmit the command described above.
`
`[0029] Referring now to FIGS. 1 and 4, the PASE module
`10 initiates a polling sequence as indicated at 60.As indicated
`at 62, the PASE module 10 determines if the fob 14 is located
`in the cabin of the vehicle 12. If no, the PASE module 10
`continues with the polling sequence as indicated at 64. If yes,
`the PASE module 10 transmits a command to the fob 14 to
`
`prompt the fob 14 to set, for example, a flag within memory
`(not shown) of the fob 14 that will inhibit it from responding
`to the polling signals but not other signals as indicated at 66.
`This flag, for example, may disable the high frequency trans-
`mitter 36, may prevent the micro-controller 32 from generat-
`ing data indicative of a response signal, etc. The strategy then
`proceeds to 64. As such, the fob 14 will wake-up for each poll
`message transmitted by the PASE module 10 and process data
`associated with each message but will then return to sleep
`because the flag is set. As apparent to those of ordinary skill,
`the fob 14 will no longer consume power from the battery 37
`to transmit a response to the poll messages.
`[0030] The PASE module 10 may transmit another com-
`mand to prompt the fob 14 to clear the flag as a result of a
`button press on the fob 14, vehicle activity and/or the battery
`37 being replaced.
`[0031] Returning to FIG. 1, the fob 14 may be pre-pro-
`grammed to reconfigure itself without the receipt of PASE
`module 10 initiated commands, such as those indicated at 50,
`58, 66 with reference to FIGS. 2, 3 and 4 respectively. In some
`embodiments, the fob 14, e.g., the micro-controller 32, may
`disable the low frequency receiver 34 after receiving a pre-
`determined number ofpolling signals within a predetermined
`period of time. For example, the micro-controller 32 may
`increment a counter each time a polling signal is received and
`
`may disable the low frequency receiver 34 after receiving four
`recognized polling signals within five seconds. In other
`embodiments, the micro-controller 32 may clear or otherwise
`alter that portion of receiver memory storing the local iden-
`tifier after receiving a predetermined number of polling sig-
`nals within a predetermined period of time. In still other
`embodiments, the fob 14 may set the flag within its memory
`that will inhibit it from responding to the polling signals but
`not other signals. The fob 14 may then be returned to its initial
`state via the techniques described above. For example, a
`button press and/or power on reset event of the fob 14 may
`cause the micro-controller 32 to return the fob 14 to its initial
`
`state. Similarly, vehicle activity communicated to the fob 14
`may cause the micro-controller 32 to return the fob 14 to its
`initial state, etc. Other configurations and arrangements are
`also possible.
`[0032] The above techniques may also be implemented at
`vehicle assembly and/or during vehicle transport/storage to,
`for example, conserve power of the battery 37.
`[0033] While embodiments of the invention have been
`illustrated and described, it is not intended that these embodi-
`ments illustrate and describe all possible forms of the inven-
`tion. Rather, the words used in the specification are words of
`description rather than limitation, and it is understood that
`various changes may be made without departing from the
`spirit and scope of the invention.
`What is claimed is:
`
`1. A passive entry system for an automotive vehicle having
`a cabin comprising:
`a control unit configured to broadcast a plurality of wake-
`up signals to prompt a token to power-up if the token is
`in a low-power consumption mode; and
`a token capable of recognizing at least one of the plurality
`of wake-up signals and of generating a response signal
`for the control unit in response to recognizing the at least
`one of the plurality of wake-up signals, the control unit
`further configured to determine if the token is located in
`the cabin based on the response signal and to broadcast
`a reconfiguration signal to prompt the token to reconfig-
`ure so that the token does not recognize wake-up signals
`broadcast subsequent to the reconfiguration signal if the
`token is located in the cabin.
`
`2. The system of claim 1 wherein each of the plurality of
`wake-up signals includes information indicative of a control
`unit identifier and wherein the token is further configured to
`compare at least one of the control unit identifiers with a
`stored identifier.
`
`3. The system of claim 2 wherein the token includes a
`receiver and wherein the stored identifier is stored within a
`
`memory of the receiver.
`4. The system of claim 2 wherein the token recognizes at
`least one of the plurality of wake-up signals if the at least one
`control unit identifier matches the stored identifier.
`
`5. The system of claim 2 wherein the token is further
`capable of altering the stored identifier in response to receiv-
`ing the reconfiguration signal.
`6. The system of claim 5 wherein the token is further
`capable ofrestoring the stored identifier in response to receiv-
`ing another reconfiguration signal.
`7. The system of claim 5 wherein the token is further
`capable ofrestoring the stored identifier in response to at least
`one of a button press and a power on reset event.
`8. A passive entry system for an automotive vehicle having
`a cabin comprising:
`
`6
`
`

`
`US 2009/0284345 A1
`
`Nov. 19, 2009
`
`a control unit configured to broadcast a plurality of signals;
`and
`
`a token capable of generating a response signal for the
`control unit based on one of the plurality of signals, the
`control unit further configured to determine if the token
`is located in the cabin based on the response signal and
`to broadcast a reconfiguration signal to prompt the token
`to reconfigure so that the token does not generate the
`response signal to at least some signals broadcast by the
`control unit subsequent to the reconfiguration signal.
`9. The system of claim 8 wherein the token includes a
`receiver and is further capable of deactivating the receiver in
`response to receiving the reconfiguration signal.
`10. The system of claim 8 wherein at least one of the
`plurality of signals includes information indicative of a con-
`trol unit identifier and wherein the token includes a stored
`
`identifier and is further capable ofrecognizing the at least one
`ofthe plurality of signals ifthe control unit identifier matches
`the stored identifier.
`
`11. The system of claim 10 wherein the token is further
`capable of altering the stored identifier in response to receiv-
`ing the reconfiguration signal.
`12. The system of claim 11 wherein the token is further
`capable ofrestoring the stored identifier in response to receiv-
`ing another reconfiguration signal.
`13. The system of claim 11 wherein the token is further
`capable ofrestoring the stored identifier in response to at least
`one of a button press and a power on reset event.
`14. The system of claim 8 wherein the token includes a
`transmitter and is further capable of inhibiting broadcasting
`response signals via the transmitter in response to receiving
`the reconfiguration signal.
`
`15. The system of claim 8 wherein the token comprises a
`key fob.
`16. A passive entry system for an automotive vehicle com-
`prising:
`a token capable of receiving a plurality of wireless signals
`and configured to (i) determine if a predetermined num-
`ber of wireless signals has been received, (ii) generate a
`response signal to at least one ofthe plurality of wireless
`signals if the number of received wireless signals is less
`than the predetermined number of wireless signals, and
`(iii) reconfigure so that the token does not provide a
`response to at least one of the plurality of wireless sig-
`nals if the number of received wireless signals is greater
`than the predetermined number of wireless signals.
`17. The system of claim 16 wherein the token includes a
`receiver and wherein the token disables the receiver if the
`
`number of received wireless signals is greater than the pre-
`determined number of wireless signals.
`18. The system of claim 16 wherein the token includes a
`transmitter to transmit the response signal and wherein the
`token is further configured to disable the transmitter if the
`number of received wireless signals is greater than the pre-
`determined number of wireless signals.
`19. The system of claim 18 wherein the token is further
`configured to re-enable the transmitter in response to at least
`one of a button press and a power on reset event.
`20. The system of claim 16 wherein the token is further
`configured to recognize at least one ofthe plurality ofwireless
`signals if a received identifier matches a stored identifier and
`to alter the stored identifier during reconfiguration.
`*
`>X<
`*
`>X<
`*
`
`7