CN1111927A - Method for operating a communication system having multiple base stations - Google Patents
Method for operating a communication system having multiple base stations Download PDFInfo
- Publication number
- CN1111927A CN1111927A CN94190463A CN94190463A CN1111927A CN 1111927 A CN1111927 A CN 1111927A CN 94190463 A CN94190463 A CN 94190463A CN 94190463 A CN94190463 A CN 94190463A CN 1111927 A CN1111927 A CN 1111927A
- Authority
- CN
- China
- Prior art keywords
- base station
- remote equipment
- security code
- mobile phone
- channel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
- H04W12/08—Access security
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/10—Network architectures or network communication protocols for network security for controlling access to devices or network resources
- H04L63/101—Access control lists [ACL]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W92/00—Interfaces specially adapted for wireless communication networks
- H04W92/04—Interfaces between hierarchically different network devices
- H04W92/10—Interfaces between hierarchically different network devices between terminal device and access point, i.e. wireless air interface
Landscapes
- Engineering & Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Computer Hardware Design (AREA)
- Computing Systems (AREA)
- General Engineering & Computer Science (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The present invention encompasses a method for establishing and maintaining communication in a portable telephone system adapted to operate with a plurality of base stations and at least one handset on a plurality of channels. The method generally includes steps of assigning a security code to the handset(s) operating in the portable communication system to enable RF communication between the handset(s) and the plurality of base stations (24); communicating the security code assigned to the handset(s) to the plurality of base stations to maintain within each of the plurality of base stations the security code(s) of the handset(s) operating in the system (26); and aligning the channel of the handset(s) with a channel of a base station to allow for communication between each handset and one of the plurality of base stations (28).
Description
The present invention relates to communication system, be specifically related to be used to operate the method for wireless communication system with a plurality of base stations.
In the past, wireless communication system provided communication between one or more remote equipments and a plurality of telepoint base station, and this base station comprises that a controller is used to regulate the communication between remote equipment and the base station.When needed, this controller provides the handover between the base station usually.An example with wireless communication system of a plurality of base stations is a cell phone system.The base station of cell phone system is controlled by the honeycomb control station usually.
Cordless telephone system is another example of wireless communication system, and this system can work with a plurality of base stations.Typically, cordless telephone system comprises one or more wireless remote equipment (that is mobile phone), and this mobile phone is relevant with single base station.Each mobile phone can be with different frequencies and base station communication.Therefore, can adapt to communication between a plurality of mobile phones and the single base station.
In having the cordless telephone system of a plurality of base stations, must allow this mobile phone and each base station communication, prevent undelegated mobile phone and this base station communication simultaneously.For this reason, need specify security code to each mobile phone, and preserve the secret code table of a permission at all effective mobile phones of this system works.Also when a mobile phone was just being waited for a base station communication, this mobile phone should be on the channel identical with the base station in the scope, so that the time quantum that reduction provides radio frequency (RF) communication link between this mobile phone and the base station to need.Therefore, when this mobile phone during not with a base station communication, the channel that needs to adjust this mobile phone is aimed at a base station in the scope.
When this mobile phone and a base station communication, because the RF communication signal strength may change with the relative position of this mobile phone to the base station between this mobile phone and this base station, have each mobile phone and one that to provide a RF communication link between the base station of the strongest RF communication link be useful.In view of the above, need in having the wireless communication system of a plurality of base stations, transmit signal of communication between each base station.
In any wireless communication system with a plurality of base stations, need to be adjusted at the communication between a mobile phone and this base station.Particularly, needing to adjust which base station will communicate by letter with special handset.Under the situation of the controller of the separation that does not utilize this base station, it is favourable adjusting communicating by letter between a mobile phone and this base station.Elimination will reduce the complexity of expense and system to any demand of separation control.In view of the above, need a kind of wireless communication system a kind of method of cordless telephone system for example with a plurality of base stations that be used to operate, any demand to the separation control of this base station has been eliminated by this system.
The present invention sets up and keeps method for communicating around a kind of being used at portable telephone system, and this system is suitable for working with a plurality of base stations and at least one mobile phone on a plurality of channels.This method usually may further comprise the steps: give security code of mobile phone assignment, this mobile phone is worked in portable communications system so that can carry out RF communication between mobile phone and a plurality of base station; The transmission assignment gives the security code of this mobile phone to a plurality of base stations, so that remain operating in the security code of this intrasystem mobile phone in each base station of a plurality of base stations; Consistent with the channel of adjusting mobile phone with a channel of usefulness base station, communicate between the base station in each mobile phone and a plurality of base station allowing.
On the other hand, the invention discloses a kind of to being applicable to and the method for the portable communications system assignment security code of a plurality of mobile phones and the work of at least one base station.This method may further comprise the steps: the current security code of each mobile phone is offered the base station; Give each mobile phone a new security code assignment; With each new security code is placed on the master meter of security code in the base station.
The invention also discloses a kind of in order to not effectively and keep method for communicating between the base station in a mobile phone and a plurality of base station during base station communication at mobile phone.According to an aspect of the present invention, a kind of method may further comprise the steps for each mobile phone: send a handshaking request to a plurality of base stations from this mobile phone periodically; Wait is from the handshaking of returning of a base station; With the BTS channel of the channel that changes mobile phone corresponding to the inverse signal exchange.
At last, according to another aspect of the present invention, disclosed herein is and a kind ofly when a mobile phone is effectively communicated by letter with a base station, be used for keeping portable communications system method for communicating, this system to have a plurality of base stations and at least one mobile phone.Particularly, this method may further comprise the steps: the signal RSSI level that appraisal receives from mobile phone in the base station; Instruct remaining base station to report RSSI level and working channel; Select the base station of the strongest RSSI signal of report; The instruction mobile phone is transformed into working channel; And between the base station of this mobile phone and the strongest RSSI signal of report, provide handshaking.
Be used for keeping when a mobile phone is communicated by letter effectively with a base station having among another embodiment of portable communications system communication means of a plurality of base stations and at least one mobile phone, the method comprising the steps of: the RSSI of signals level that appraisal receives from mobile phone in the base station; Put the base station in hold mode, this mobile phone request proceeds to the connection of the base station of the strongest RSSI signal of report; Between the base station of this mobile phone and the strongest RSSI signal of report, provide handshaking.
In the present invention who describes, referring to following accompanying drawing, wherein:
Fig. 1 is to use the plane graph of the conventional wireless communication system of a plurality of base stations of having of method of the present invention and a plurality of wireless phones;
Fig. 2 is the flow chart that is used to operate the method for the communication system with a plurality of base stations according to the present invention;
Fig. 3 is the flow chart that transmits the security code method according to the present invention between each base station;
Fig. 4 is the flow chart that is used to keep the method for the adjustment of channel between base station and the mobile phone according to the present invention;
Fig. 5 is the flow chart that is used to set up the method for mobile phone off hook state according to the present invention;
Fig. 6 is a flow chart of carrying out method of handover according to the present invention between each base station; With
Fig. 7 is a flow chart of carrying out another method of handover according to the present invention between each base station;
Fig. 8 is the block diagram that is used for the preferred circuit of operate wireless communication systems according to the present invention;
Fig. 9 is the circuit diagram of the optimum signal transceiver circuitry shown in the block diagram of Fig. 8.
Referring to Fig. 1, the figure shows the plane graph of the wireless communication system 10 that utilizes a plurality of base stations 11 of having of circuit of the present invention and method and a plurality of mobile phone 12.Base station 11 usefulness data link 14 are connected to the single line 16 of public system telephone network (PSTN) 18, although method of the present invention can be applicable to the base station system that connects the multiple phone line road.In wireless communication system, can comprise any amount of mobile phone 12, and only need a mobile phone.Mobile phone 12 can comprise and can carry out any equipment that RF communicates by letter with base station 11.An example of a base station and relevant mobile phone comprises a cordless telephone.Can utilize the cordless telephone of the inventive method open in transferring the United States Patent (USP) NO.5140635 of Motorola Inc, quote whole patent as a reference.
As shown in Figure 1, indicate with the solid line between the base station by data link 14(each base station 11) and other base station communication.Best, by connecting the same phone line 16 of each base station to the public system telephone network, this data link can comprise the plug ring and the plug tip circuit of the standard of public system telephone network.On the other hand, the communication between the base station can realize by RF communication or through the AC power supplies circuit.At last, each mobile phone 12 is by RF signal of communication communicate by letter with each base station 11 (shown in the dotted line among Fig. 1).
Now forward Fig. 2 to, this flowcharting is used to operate the method for optimizing of the communication system with a plurality of base stations according to the present invention.For fear of the interference between each base station in a plurality of base station systems, each base station is limited in certain subclass of total available channel best.For example, in frequency division multiple access (FDMA) 49 megahertz cordless systems, always having 10 channels at present can use.In system with two base stations, but first base station allocated channel 1-5, but and second base station allocated channel 6-10.Best, to give the channel of single base station be not adjacent frequency in the frequency spectrum in assignment.Except when require reporting on the particular channel outside their the RSSI level for the handover purpose, base station communication in their channel domain (domain) always, this is discussed below.
Be in the base station assigns channel domain, preferably always being provided with two base stations in the RF of identical mobile phone scope can have the cross-channel territory.Promptly intersecting when the RF scope of base station provides the handover of no joint, and the base station that preferably has intersection RF scope does not have the RF of intersection channel domain.Therefore,, give the base station, might guarantee to be provided with two territories and intersect by allocated channel exclusively if the base station more less than total available channel arranged.Therefore, this base station can be placed on their desirable place, should be noted that this base station can have overlapping channel domain if the base station is less than available channel, is in identical RF scope if the base station places the channel avoid having overlapping channel domain carefully.But,, must be noted that and place base station with cross-channel territory if a system has than the more base station of available channel.
There are many methods to realize territory assignment according to the present invention to the base station.But the assignment of the keyboard artificially allocated channel by using the base station is with selective channel.On the other hand, but this base station pre-programmed when producing.At last, this base station can allow mutual conciliation (arbitration) to guarantee using the RF channel simultaneously when the base station has RF their nothings when covering overlapping radius and when within the remote equipment scope that is stipulating this base station.There is thousand and one way to reconcile, for example, when transceiver idle or that add a separation is used to reconcile, can reconciles by the RF communication base station.On the other hand, this base station can be reconciled through AC power supplies circuit or PSTN.Conciliation will allow serving the base station of mobile phone or automatically or by the user ask to scan all available (promptly all being 10) RF channels.If a base station requires to use the channel of side outside its normal channel territory, and the current use of that signal, it will exchange the base station of that channel of assignment simply.This can carry out in real time, makes the user insert all available channels.
For fear of the interference from the base station (for example Lin Jin phone) outside many base station systems, the base station of not serving this mobile phone is checked their RSSI level periodically, and whether have a look at has potential interference to exist.If have, the quiet or unappropriated channel of this base station scans in its territory.On the other hand, this base station can be exchanged so that move to unappropriated channel if desired.Then, when the mobile phone to base station scans moves to that base station field, on unappropriated channel, connect probably, need not on busy channel, to require any communication.
BTS channel territory with foundation, security code can be given mobile phone in step 24 assignment.Usually, specify security code to guarantee it only is that those mobile phones of this system's part could allow and the base station communication of this system.Therefore, the mobile phone relevant with near the external base station one of user base station will not allow the base station communication with the user.Best, when this mobile phone was supported on this base station, the security code that is assigned to each mobile phone can be designated.The assignment of security code can realize by the actual connection between mobile phone and this base station.But, might transmit signal by RF and come the assignment safety code.For added security, before a security code can be assigned to a mobile phone, the user may require access code.
In step 26, must be sent to all the other base stations of system for the security code of any given mobile phone by a base station assigned, allow any base station communication in this mobile phone and the system.Preferably, assignment can shift for the security code of mobile phone between each base station by data link, for example, disclose at the U.S. Patent application that is called " circuit and the method that are used for operate wireless communication systems " by James Mielke invention and name, this application transfers assignee of the present invention and application on the same day therewith.The application of front usually discloses a kind of Method and circuits that is used to shift security code, and this security code is as at the 30KHZ signal that is coupled on the data link of communication line.Describe this circuit in detail referring to Fig. 8 and 9.On the other hand, security code can be when producing pre-programmed, use the programming of base station and/or cell phone keyboard artificially, perhaps produce once (or ask to produce repeatedly through the user) randomly, send to each base station through once actual connection (promptly by the electric charge contact) then by mobile phone.So just do not need the communication of base station to base station, therefore reduced the complexity of cost and system.
In step 28, this base station keeps the channel consistent with mobile phone, can set up the RF communication link so that guarantee between each mobile phone and base station.Usually, the RF communication link of each mobile phone on allocated channel asked and a signal of base station exchange periodically.If this handshaking request is success not, this mobile phone will continue request signal exchange on different channels, till it receives an affirmation from the base station.Therefore, respond a bell signal and maybe start one when calling out when this mobile phone off-hook, this mobile phone with relevant with a base station in this mobile phone scope not with channel on.Although channel adjustment is useful in having the system of single base station, and in having the system of many base stations, keep the adjustment particular importance of channel.When a mobile phone is mobile in the zone that is covered by this base station, this mobile phone can be on unappropriated channel with scope in one of them base station communication.
In step 30, carry out off-hook request and a base station communication.Maybe when sending an outgoing call, carry out the off-hook request in response to a bell signal.With after a base station is connected, keep in touch in this RF communication link and this base station, up to till step 32 request handover.User's whilst on tour in this base station area when this mobile phone may need handover.This user can travel outside the scope of a base station and within the scope in another base station, asks the handover of another base station.The dialogue end, at this mobile phone of step 34 with on-hook.After on-hook, it is consistent with the channel of this base station that this mobile phone will keep, such as referring to step 28 description.
Forward Fig. 3 now to, this figure description list first finger is joined the detail flowchart that security code is given the optimum operation of mobile phone (shown in the square 24 of Fig. 2).In step 40, in beginning, this mobile phone detects it and has been placed in the charging support of base station and through RF or by electric charge contact (charge contact) and sends the security code request to this base station.Best, this request comprises the copy of current (being original) security code of a mobile phone.Whether in step 42, the secret code table of all known mobile phones is checked in this base station then, determine before it and mobile communication.In step 44, this base station produces a new random secret sign indicating number and sends it to this mobile phone.In step 46, this base station waits receives a confirmation signal from this mobile phone then, and indication has received new security code.
If this base station does not receive an affirmation from this mobile phone, determine in this base station of step 48 that so whether this mobile phone is still in this base station.If this mobile phone is in this base station, produces a new random secret sign indicating number and send it to this mobile phone in this base station of step 44.But, if this mobile phone still not in this base station, in step 50, this base station is withdrawed from.On the other hand, if send this security code, in step 46, if not confirming shown in chain-dotted line returns then in step 44, this base station produces a new random secret sign indicating number from mobile phone by RF.
In step 46, if this base station receives an affirmation of returning from mobile phone, expression has received this new security code from this base station, this base station checks that assignment gives the secret code table of the mobile phone in the system, with the original security code of determining this mobile phone in step 52 whether in this table.If this original security code is in this table then in step 54, this base station is with the original security code of the security code of this new assignment replacement, and withdraws from step 50.But,,, then replace idle time slot with new security code in this base station of step 58 if idle time slot is arranged if original security code determines whether to have any idle time slot in this base station of step 56 in table not in this table.But,, be used in the security code that the new security code of this table replaces current less use in this base station of step 60 if do not remain idle time slot in this base station.Therefore, this base station will keep the table of all effective mobile phones in the system.As previously mentioned, maintain identical secret code table in each base station, communicate by letter between each mobile phone and any base station allowing.
Forward Fig. 4 now to, this figure describes the best approach that keeps channel adjustment (shown in the square 28 of Fig. 2).After this security code of assignment was given mobile phone, method of the present invention remained on the channel adjustment between each mobile phone and the given base station.Particularly, in step 70, the cycle timer expiration starts the channel adjustment program.In step 72, the even distribution of this mobile phone usefulness channel is the selective channel search graph randomly.The random distribution of channel is useful in having the communication system of a plurality of mobile phones.Particularly, a kind of simple avoiding collision is side by side to search for a base station by more than one mobile phone, is used to adjust or the purpose of off-hook.
This mobile phone setting operation channel is to the first channel N of this figure.Best, first channel among this figure is placed in mobile phone and before had been adjusted on that channel of a base station.If this mobile phone still is adjusted, this can be reduced in the occupied time of this process channel.In step 74, the RF link on this mobile phone channel N sends a request signal and exchanges to the base station then.In step 76, this method determines on the channel N in scope whether a base station is arranged then.If a base station is arranged on the channel N in scope, this mobile phone is adjusted with this base station.Therefore, in step 78, this base station sends an affirmation.In step 80, if this mobile phone is recognized this affirmation, this mobile phone turns back to step 70, and the latent period timer expiration realizes the one other channel adjustment.
In step 76, if do not have the base station on the channel N in scope or do not recognize affirmation from this base station at this mobile phone of step 80 in predetermined amount of time, then in step 82, this mobile phone makes this channel number advance to the next channel of this figure.Then, in step 84, this mobile phone determines whether that all channels among the figure are used.If all channels also are not used, then in step 74, this mobile phone sends the request of a handshaking to this base station through the RF link on new channel N.If but all channels among this figure are used, this mobile phone turns back to step 72, selects a new channel search figure randomly and restarts the channel adjustment process.This mobile phone can randomly be adjusted to the base station with the highest RSSI level.
Therefore, if do not increase channel to the base station on certain channel with not exchanging, keep the channel adjustment of this mobile phone and base station referring to the described channel adjustment process of Fig. 4 from this base station reception inverse signal by sending the handshaking request periodically.When on-hook when this mobile phone from a position in the scope of base station when move another position, this mobile phone will be adjusted with the base station.
Forward 5 now to, the method according to this invention, the optimum operation of this flow chart description off-hook request (shown in the square 30 of Fig. 2).Particularly, in step 90, the user is in the mobile phone connection of starting.In step 92, this mobile phone selects to have the equally distributed channel search figure of channel randomly then.The channel that this mobile phone is provided with this mobile phone equals the first channel N among this figure.Best, first channel among this figure is positioned in the channel of before having determined during the channel adjustment process (describing in detail referring to Fig. 4), carries out the time that off-hook connects to be needed so that reduce.
In step 94, the RF link on this mobile phone channel N sends a request off-hook to this base station then.In step 96, this mobile phone determines on the channel N in scope whether a base station is arranged.If a base station is arranged on the channel N in scope, then in step 98, this mobile phone determines that whether this base station is at mobile phone of service.If this mobile phone is not also served in this base station, in step 100, this base station sends a confirmation signal and off-hook at channel N.In step 102,,, on channel N, connect in step 104 if this mobile phone is recognized an affirmation.
If a mobile phone has been served in this base station, in step 106, no matter this base station is the request of this mobile phone.Similarly, if do not have the base station on the channel N of step 96 in scope, or do not recognize an affirmation at this mobile phone of step 102, then in step 108, this mobile phone shifts to an earlier date the next one of channel number to this figure number.In step 110, if all channels among this figure are not used in step 94, this mobile phone sends a request off hook signal to this base station through the RF link on the next channel in table.But if all channels among this figure are used, so in step 92, this mobile phone selects to have equally distributed new channel search figure randomly to begin the off-hook request once more.
Forward Fig. 6 now to, the figure shows a kind of method of the function that is used to realize Fig. 2 square 32.After having connected with a base station, in step 120, base station originally (promptly any be handed over to a new base station before, have the base station of a connection) will determine whether require handover periodically according to the time-out period of setting up.In step 122, this original base station will determine whether the level of the RSSI of original base station or mobile phone drops under certain threshold value.If base station originally and/or mobile phone RSSI level have been reduced under the threshold value, at the current channel of not serving all base stations of mobile phone of the original base station command of step 124 to it.Current each base station report of not serving mobile phone is also instructed in this original base station: (ⅰ) the RSSI level of this mobile phone and (ⅱ) will be at the channel of step 126 work.In step 128, all then base stations are turned back to their original channel and original base station selected base station with the highest RSSI signal by instruction.This original base station also send one " to channel * " to this mobile phone.
In step 130, this mobile phone starts one with this new signal of base station exchange and wait for the handshaking of returning.If do not have the inverse signal exchange, turn back to original base station at this mobile phone of step 132.If when returning, this mobile phone can not rebulid and the communicating by letter of original base station, this mobile phone will use as referring to the same search figure of Fig. 5 detailed description as off-hook to new base station search.But if there is not the inverse signal exchange, in step 134, this new base station sends an on-hook order to original base station.Therefore, if the communication by TELCO(is arranged) circuit, the communication of base station to the base station that the RF communication line of AC circuit or separation provides, the handover procedure that might realize having less communication disruption.
Forward Fig. 7 now to, the figure shows another alternative method of the square 32 of realizing Fig. 2.Particularly, be described in the method for handover in base station to the system of station communication that does not have to separate referring to Fig. 7.In step 140, certain time-out period is set up in base station originally.In step 142, if determining base station that this is original and/or the level of mobile phone RSSI, original base station drops under certain threshold value, then in step 144, base station originally enters and keeps and mobile phone begins the off-hook request.This off-hook request is equal to referring to the described off-hook request of Fig. 5 and here no longer repeats.In step 146, if this mobile phone fails to find another base station, in step 148, this mobile phone turns back to original base station, and makes and itself do not keep data-message.But, if in step 150 by detecting the change of telco line impedance, this original base station recognizes that this new base station enters off-hook, itself on-hook of this original base station.
Now forward Fig. 8 to, the figure shows and between the base station, be used to the optimal circuit of communicating by letter.The block diagram of base station 10 represents to provide between each base station by data link the relevant portion of the base station of information signal.Each base station comprises that usually is used to send the transceiver 220 that the RF signal of communication arrives each remote equipment 12 and receives the RF signals of communication from this equipment 12.The radio set of knowing in the prior art can be with in the present invention.Best, utilize disclosed radio transceiver circuitry in aforesaid United States Patent (USP) 5140635.The RF signal of communication comprises frequency or the channel that remote equipment takies, assignment works for remote equipment in wireless communication system 10 to allow this remote equipment security code and any message signale.This message signale can be depending on remote equipment, but can comprise voice signal, facsimile data or computer data.
Produce an information signal on the radio set 220 also online 222.This information signal can comprise receiver signal strength indication (RSSI) signal and the relevant security code that is used for this remote equipment.The indication of RSSI signal is from the intensity of the RF signal of communication of remote equipment 12 receptions.In having the system of a plurality of remote equipments, each remote equipment 12 is produced a RSSI signal and by the security code identification that interrelates with this remote equipment.This RSSI signal can be the ON/OFF indication.Perhaps can represent the discrete level in the level preset range of representation signal intensity.The information signal that comprises the RSSI signal is provided to microprocessor 228.
At last, answering machine 233 may be to be included in one of them base station.Best, this answering machine will be a kind of digital answering machine.
Forward Fig. 9 now to, this figure at length is illustrated in the square frame form shown in the optimum signal transceiver circuitry 224(Fig. 8 that has in each base station 11).Transmitter circuitry 230 comprises an AND gate 234, and this AND gate has the first input end 236 and coupling second input 238 with reception data of coupling to receive the 30KHZ square wave.These data should comprise the information signal of describing remote equipment, the channel of work or frequency and the RSSI signal that is produced by radio set recited above.By these data and 30KHZ square-wave signal AND-operation, these data will send as the 30KHZ square wave.On the other hand, these data can provide the signal as 30KHZ by microprocessor.The output 240 of AND gate 234 is coupled to tip by capacitor 242.Best, capacitor 242 is about 200 microfarads." with ".The output 240 of door 234 also is coupled to phase inverter 244.The output 246 of phase inverter 244 is coupled to ring-wire through a capacitor 248.Capacitor 248 is 200 microfarads preferably also.
Telco circuit 226 also is shown in greater detail in Fig. 9.Telco circuit 226 comprises a transformer 252, is used to send audio signal to radio set with from this radio set received audio signal.This transformer is connected to relay 254.Relay 254 is by a transistor 256 control, and transistor 256 is by the voltage control conducting on the control electrode 258 that is connected to input resistance 260 or end.Relay 254 is connected to bridge circuit 262 at node 264.The node 266 and 268 of bridge circuit 262 is connected to the TR tip and ring line.Bridge circuit 262 also at node 266 and 268 from TR tip and ring line received signal.At last, node 270 is received transformer 252, is used for sending a signal to radio set from the TR tip and ring line.
At last, signal transceiver circuit 224 comprises a receiver circuit 270.This receiver circuit plays the work of band pass filter in order to pass through the information signal and the signal that stops from the public system telephone network from other base station.Best, receiver circuit 270 passes through the 30KHZ information signal by transmitter circuitry 230 transmissions of other base station.
Detailed signal transceiver circuit 224 shown in Figure 9 is examples of available circuit.But, should be understood that and can utilize other signal transceiver circuit that on data link, is used to send and receive about 30KHZ information signal within the scope of the invention.
In a word, the present invention set up with remain on portable telephone system in communicate by letter, this system is suitable for carrying out work with a plurality of base stations and at least one mobile phone on a plurality of channels.This method usually assignment security code is given each base station that is copied to that is operated in the mobile phone in this portable communications system and security code is provided, and makes to carry out RF communication between mobile phone and base station.This method is also used the channel of a channel adjustment mobile phone of base station, so that communicate by letter between the base station of permission in each mobile phone and a plurality of base station.Particularly, when a special mobile phone not in use, this method keeps channel adjustment with a base station in its scope.And, carrying out the RF communication period with mobile phone, base station handover between the base station is communicated by letter so that keep.Can provide such handover by the communication between each base station.
Claims (10)
1, be used for setting up and keeping method for communicating in the portable radiotelephone system, this system comprises a plurality of base stations, is applicable to through many radio channels to communicate by letter with at least one remote equipment, and described method comprises step:
Specify security code to give this at least one remote equipment, make it possible between this at least one remote equipment and a plurality of base station, communicate by letter;
Transmission is assigned to the security code of this at least one remote equipment to a plurality of base stations, remains operating in the security code of this at least one remote equipment of this system in each base station of a plurality of base stations; With
The radio channel of adjusting this at least one remote equipment with the radio channel of a base station in a plurality of base stations is to communicate by letter between permission at least one base station in this at least one remote equipment and a plurality of base station.
2, in the portable radiotelephone system, be used for setting up and keeping method for communicating according to claim 1, this system is suitable for working with a plurality of remote equipments, wherein specifies the step of security code to comprise each equipment of specifying different security codes to give a plurality of remote equipments.
3, in the portable radiotelephone system, be used for setting up and keeping method for communicating according to claim 1, this system is suitable for working with a plurality of remote equipments, and the step that wherein transmits security code is included in each base stations of a plurality of base stations a plurality of remote equipments are produced a secret code table.
4, in the portable radiotelephone system, be used for setting up and keeping method for communicating according to claim 1, wherein specify the step of security code to comprise step:
The current security code to of a remote equipment base station is provided;
Specify a new security code to give this remote equipment; With
Place this new security code on the master meter of security code.
5, in the portable radiotelephone system, be used for setting up and keeping method for communicating according to claim 4, wherein provide current security code to communicate by letter by RF and finish with the step of specifying new security code.
6, be used for the method that the Portable Radio Communication system specifies security code, this system comprises a plurality of remote equipments, is suitable for through at least one radio channel and at least one base station communication, and the method comprising the steps of:
The current security code of each equipment of a plurality of remote equipments is provided;
Specify a new security code to give each remote equipment of a plurality of remote equipments; With
Place on the master meter of each new security code security code in this at least one base station.
7, remote equipment method for communicating in maintenance and the radio communications system, this system comprises at least one base station, is suitable for communicating by letter with at least one remote equipment on many radio channels, described method comprises step:
Send the handshaking request periodically to this at least one base station from this at least one remote equipment;
Wait is from this at least one base station inverse signal exchange; With
In response to the channel of at least one base station of inverse signal exchange, change the channel of this at least one remote equipment.
8, keep and the remote equipment method for communicating according to claim 7, be suitable for working with a plurality of base stations, wherein a plurality of base stations remain on different channels.
9, be used for keeping method for communicating in the Portable Radio Communication system, this system comprises a plurality of base stations, be suitable on many wireless channels, communicating by letter with at least one remote equipment, described at least one remote equipment is effectively to communicate by letter with a base station of described a plurality of base stations, and described method comprises step:
The receiver signal strength indication level of the described signal that evaluation receives from described at least one remote equipment in a described base station;
Described base station command residue base station report receiver signal strength indication level and working channel;
The base station of strong receiver signal intensity indication signal is reported in selection;
Instruct described remote equipment to be transformed into described working channel; With
At remote equipment with report between the base station of strong receiver signal intensity indication signal handshaking is provided.
10, be used for keeping method for communicating in the Portable Radio Communication system, this system comprises a plurality of base stations, be applicable to through many radio communicating channels and communicate by letter with at least one remote equipment, described at least one remote equipment is effectively to communicate by letter with a base station of described a plurality of base stations, and described method comprises step:
The receiver signal strength indication level of the described signal that evaluation receives from described at least one remote equipment in a described base station;
A described base station is set for keeping;
Ask described at least one remote equipment to proceed to and report the connection of the described base station of strong receiver signal intensity indication signal;
At described at least one remote equipment with report between the described base station of strong receiver signal intensity indication signal handshaking is provided.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US9524193A | 1993-07-20 | 1993-07-20 | |
| US08/095,241 | 1993-07-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1111927A true CN1111927A (en) | 1995-11-15 |
Family
ID=22250877
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN94190463A Pending CN1111927A (en) | 1993-07-20 | 1994-06-13 | Method for operating a communication system having multiple base stations |
Country Status (8)
| Country | Link |
|---|---|
| JP (1) | JPH08501918A (en) |
| KR (1) | KR960701562A (en) |
| CN (1) | CN1111927A (en) |
| BR (1) | BR9405522A (en) |
| CA (1) | CA2142613A1 (en) |
| GB (1) | GB2285560B (en) |
| SG (1) | SG52268A1 (en) |
| WO (1) | WO1995003677A1 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5930703A (en) * | 1996-03-21 | 1999-07-27 | Ericsson Inc. | Methods and systems for programming a cellular radiotelephone |
| US6370380B1 (en) * | 1999-02-17 | 2002-04-09 | Telefonaktiebolaget Lm Ericsson (Publ) | Method for secure handover |
| WO2001035586A1 (en) * | 1999-11-12 | 2001-05-17 | Motorola, Inc. | Method and apparatus for network controlled handovers in a packet switched telecomunications network |
| US7486952B1 (en) * | 2000-02-09 | 2009-02-03 | Alcatel-Lucent Usa Inc. | Facilitated security for handoff in wireless communications |
| US7151446B2 (en) | 2003-08-01 | 2006-12-19 | Spectrum Tracking Systems, Inc. | System for tracking and locating an object using a cellular network |
| US7135967B2 (en) | 2003-08-01 | 2006-11-14 | Spectrum Tracking Systems, Inc. | Method for locating an asset |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4593155A (en) * | 1983-12-05 | 1986-06-03 | Motorola, Inc. | Portable telephone ID code transfer system |
| DE3880038T2 (en) * | 1987-07-31 | 1993-07-15 | Nec Corp | ENTERING A NEW CORDLESS TELEPHONE IN AN EXISTING SYSTEM. |
| US4901340A (en) * | 1988-09-19 | 1990-02-13 | Gte Mobilnet Incorporated | System for the extended provision of cellular mobile radiotelephone service |
| US5195127A (en) * | 1988-09-19 | 1993-03-16 | Kabushiki Kaisha Toshiba | Radio telephone system and its control method |
| US4953198A (en) * | 1989-07-05 | 1990-08-28 | At&T Company | Public cordless telephone |
| US5142534A (en) * | 1990-10-17 | 1992-08-25 | O'neill Communications, Inc. | Wireless integrated voice-data communication system |
| US5353331A (en) * | 1992-03-05 | 1994-10-04 | Bell Atlantic Network Services, Inc. | Personal communications service using wireline/wireless integration |
-
1994
- 1994-06-13 BR BR9405522-0A patent/BR9405522A/en not_active Application Discontinuation
- 1994-06-13 CA CA002142613A patent/CA2142613A1/en not_active Abandoned
- 1994-06-13 JP JP7505132A patent/JPH08501918A/en active Pending
- 1994-06-13 CN CN94190463A patent/CN1111927A/en active Pending
- 1994-06-13 KR KR1019950701044A patent/KR960701562A/en not_active Application Discontinuation
- 1994-06-13 WO PCT/US1994/006561 patent/WO1995003677A1/en active Application Filing
- 1994-06-13 GB GB9504953A patent/GB2285560B/en not_active Expired - Fee Related
- 1994-06-13 SG SG1996001660A patent/SG52268A1/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| BR9405522A (en) | 1999-09-08 |
| GB2285560B (en) | 1998-01-14 |
| GB9504953D0 (en) | 1995-04-26 |
| KR960701562A (en) | 1996-02-24 |
| JPH08501918A (en) | 1996-02-27 |
| GB2285560A (en) | 1995-07-12 |
| CA2142613A1 (en) | 1995-02-02 |
| SG52268A1 (en) | 1998-09-28 |
| WO1995003677A1 (en) | 1995-02-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0300721B1 (en) | Colocated cellular radiotelephone systems | |
| CN1047270C (en) | Apparatus and method for alternative radiotelephone system selection | |
| EP1653708B1 (en) | Method and device for communication on a network | |
| US5345597A (en) | Call set-up in a radio communication system with dynamic channel allocation | |
| US5159596A (en) | Mobile communication system | |
| US5513248A (en) | Cordless telephone micro-cellular system | |
| JP2930926B2 (en) | Call setting method in wireless communication system | |
| US5822693A (en) | Method and apparatus for controlling a base station utilizing a dual mode mobile station | |
| EP0325713A2 (en) | Cellular radiotelephone system with dropped call protection | |
| JPH09163431A (en) | Radio channel allocating method | |
| EP0475348B1 (en) | Cordless key telephone system having zone switching function | |
| EP0452872B1 (en) | Cordless key telephone system for covering multiple service areas having exclusively assigned control channels | |
| US6148210A (en) | Personal communication system and technique with zone report feature | |
| US5890069A (en) | Cordless telephone micro-cellular system | |
| JPH06205459A (en) | Method of establishing low power wireless system for telephone service and its radio link | |
| CN1109253A (en) | Call routing for a radiotelephone in multiple radiotelephone systems | |
| JPH10506774A (en) | Mobile radio receiver for cellular radio communication system | |
| CA2254403A1 (en) | Mobile communication termination controlling method and mobile communication termination controlling system | |
| EP1130936B1 (en) | Dynamic logical coverage areas for wireless base stations | |
| EP1365619B1 (en) | Radio communication system, radio terminal, base station, control equipment and communication method | |
| EP1077582B1 (en) | Method to reduce interference between mobiles using different duplex technology | |
| EP0406905A2 (en) | Dual donor booster system | |
| CN1111927A (en) | Method for operating a communication system having multiple base stations | |
| CN1305665A (en) | Method and system for regulating transmission power of mobile station of mobile radio system | |
| JPH0563635A (en) | Traffic decentralizing system by radio base station output control |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |