CN1428060A - Wireless communication system and method - Google Patents
Wireless communication system and method Download PDFInfo
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- CN1428060A CN1428060A CN 01808853 CN01808853A CN1428060A CN 1428060 A CN1428060 A CN 1428060A CN 01808853 CN01808853 CN 01808853 CN 01808853 A CN01808853 A CN 01808853A CN 1428060 A CN1428060 A CN 1428060A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/18—Selecting a network or a communication service
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
- H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
Abstract
A system for, and method of, optimising communication on one or more wireless communications systems, wherein a transmission procedure is determined in accordance with information about the environment in which a mobile station (MS) wishing to transmit is located. The mobile station may gain information about the environment by communication with other mobile stations (MS). The present invention provides methods and systems for choosing the most suitable channel or access method for making a transmission from a mobile station.
Description
Invention field
The present invention relates to wireless communication system.More precisely, the present invention relates to the optimization of the communication on this type systematic.
Background of invention
Wireless communication system usually comprises some radio stations (radio) that may be linked in many ways together.These " radio stations " may be mobile phones.In addition they move or portable radio, be commonly called " paramagnetic resonance (PMR) " radio station.Below, term travelling carriage (MS) is used to mobile phone and portable or mobile radio station.
Travelling carriage can be by the base station communication of this system.A unit of this wireless communication system is usually served in each base station.This base station provides or to fixed-line telephone system (" POTS ") or the interconnection of other travelling carriage in the native system.Mobile device by base station communication may or not in the same unit at this network.In addition, travelling carriage can be communicated by letter and another travelling carriage direct communication with " direct mode ".
In the wireless communication system of the current operation that comprises a foundation structure of managing this network, the travelling carriage in that network receives a large amount of information from this base station controller (BSC).This information helps them to utilize radio channel available in this network best.Yet to there not being the network of fundamentals of management structure, the situation that is called ad-hoc networks is very different.Equipment in this type systematic only can be by analyzing them environment promptly in its current operating area the radio station of all available channels and behaviour in service obtain this information.This analysis is very time-consuming and similarly is undesirable from a systematic function viewpoint.Equally, in some cases, can not receive enough information by the travelling carriage in the network of foundation structure management and allow them to utilize available channel this network best from this base station controller (BSC).
In view of this, have a problem, promptly the travelling carriage in a wireless communication system (MS) can not be optimized their communication and performance by utilizing optimal radio channel communication.This problem especially exists in specialized system, also is present in the system that utilizes a fundamentals of management structure simultaneously.
This problem that outline with reference to the selection of optimization channel extends to the use of the mobile communication equipment that can visit an above radio access system.The example of this class radio access system is be used for global number mobile telephone system (GSM), general mobile telecommunication system (UMTS) and a Bluetooth system.In the overlapping situation of the ability of these systems, an equipment that exists a problem promptly can visit an above system in a given position can not be optimized its communication and performance by utilizing optimal access method and/or system.
The present invention solves above-mentioned some or all of shortcoming.
Summary of the invention
The invention provides a kind of method and the system thereof that are used to optimize the communication on one or more wireless communication systems.According to the present invention, want the information of the residing environment of the travelling carriage (MS) that transmits to determine to come transmission course according to relevant.
According to a preferred embodiment of the invention, provide a kind of method, wherein determined comprising of transmission course: selected a wireless channel or be used in a kind of access method in the desired transmission.About can comprising radio condition and channel/system, the information of this environment uses information.This information may be from collecting at other travelling carriage in a zone of this travelling carriage of wanting the information that transmits.In addition, this information may be a network or the acquisition of some networks via this residing overlay area of MS.In addition, the MS in the network can share this information.This share may by one or more MS by reciprocity help information (peer assist message) (PAM) the signaling grouping broadcast and receive and realize by all MS in a specific scope.
But the grouping of the MS monitor PAM in a network, and when requiring to transmit, determine that thus which channel should be used to transmit.
When a MS adjusts to a new wireless channel, can carry out following steps.This MS just can monitor and analyze the PAM signaling grouping by near the broadcasting of the MS it, and it can discern the information that will replenish the information of being carried by this PAM grouping that is present in this network, and can broadcast the PAM signaling grouping that comprises the information of being discerned.Side information can comprise not the information broadcasted by MS at this network and by geography on away from the MS broadcasting of the MS of this up-to-date adjustment and the information do not relayed by in its vicinity a MS.Geographic distance can use global positioning system (GPS) information or bit error rate (BER) (BER) and signal strength signal intensity to determine.
Sharing Information can further comprise current channel status, other channel activity and the information relevant with the MS position between MS.Can determine to be suitable for most channel transmitted according to these information units.In addition, the MS positional information may be utilized to be formed for the reciprocity route map of the MS in a network.This class map can help MS transmit packet (via reciprocity MS chain) to may be not at other MS of this inchoation equipment scope.In addition, the alternate channel activity may be utilized to make MS to be connected to a calling on the alternate channel that it will add.
In another preferred embodiment, want the MS that transmits the request of information can be sent near travelling carriage, MS can receive and estimate that request responding, can select the optimal access method that is used to transmit, or the whole bag of tricks and it can be connected to suitable system or suitable many systems.Near travelling carriage may be defined as those equipment that travelling carriage can communicate with via a direct mode radio channel.In addition, can comprise a request to the request of information to MS position and route map.Providing of this information can allow MS to produce the foundation and the shared address list information of this request.
Can comprise expense to the present load in system, access system, the current service mass parameter relevant and the request of battery life to the request of information with system.By the decision that whether is connected to system that MS made based on a cover standard.If system satisfies those standards, it is suitable that system may be considered to this MS.
In another preferred embodiment, MS can send request to information to the some networks in its residing overlay area, MS can receive and estimate from the response to the all-network of this request of being sent, and can select optimal access method multi-method perhaps concerning transmission, and can be connected to one or more suitable systems.Once more, can comprise expense to the present load in this system, access system, the current service mass parameter relevant and the request of battery life to the request of information with this system.Determine whether that connected system is based on a cover standard.If a system satisfies these standards, it is suitable that system may be considered to this MS.
A kind of system also is provided, has been used for optimizing and on one or more wireless communication systems, communicates by letter, wherein wanted the information of the residing environment of a travelling carriage of the information that transmits to determine a transmission course according to relevant.
The simple declaration of accompanying drawing
Other distinctive advantage of the present invention may become clear from following explanation and accompanying drawing, wherein:
Fig. 1 is illustrated in the several mobile stations in the overlay area of network;
Fig. 2 represents travelling carriage and relevant therewith some signals;
Fig. 3 represents to be transferred to new channel in the proprietary communication net based on it, and the flow chart of the behavior of MS is described;
Fig. 4 describes the travelling carriage of the overlay area that is arranged in some networks; And
Fig. 5 represents that definite which network is described in detail in detail or those networks are best suited in the flow chart of the method for transmission.
Fig. 6 illustrates total scheme of wireless communication system 10 according to the present invention.
Fig. 7 illustrates a travelling carriage (MS) according to the present invention.
The present invention is described with reference now to accompanying drawing as previously discussed.The explanation of preferred embodiment
See as Fig. 1, in the network site,, in the overlay area 104 of this network, have several mobile stations (MS) 102,106 no matter it is ad-hoc networks or the honeycomb communicating network that utilizes the foundation structure of control.In ad-hoc networks, exist the some MS that are used at least one radio channel in the communication and are considered to equity on that channel, to intercom mutually.There is not the complete Control Network of single entity; Each MS must have its a cover access rule.These rules are determined the behavior of this MS.
Fig. 2 describes this method in detail, wherein travelling carriage and another shared information.As can be seen, MS 202 can broadcast the grouping of reciprocity help information (PAM) 204 signalings.The PAM bag can maybe may be embedded in the current communication that is just taking place on channel by the one or more equipment that relate in that communication by any equipment periodic broadcasting on the channel of not calling out.Travelling carriage uses the information that is included in the input PAM grouping 206 to optimize the effective channel of themselves use.In addition, the travelling carriage of broadcasting PAM signaling grouping also is provided by the information that provides in the PAM grouping that the input information in the input grouping optimizes at themselves that is included in.
The example of the information that transmits as the part of PAM signaling grouping, and how the MS that receives it to utilize that information, as seen referring to following:
1) Channel Identifier-current channel that is just using of this information unit identification by the MS that broadcasts the grouping of PAM signaling.Sort signal can utilize to help them to locate and to arrange the priority of potential (potential) radio channel by the search travelling carriage.Like this, this information is used in and focuses in the particular channel of managing to set up with another mobile stations communicating.
2) channel status-this information unit shows on relevant with the MS that the broadcasts the PAM grouping at any given time channel what is taking place.It can be by not calling, a standard call, and urgent call or grouped data are transmitted in ongoing indication and form.
3) network parameter-this information unit comprises various network parameters such as ＂ arbitrary access frame length ＂ and ＂ maximal call time ＂ usually.The optimal value that is used for these parameters can be calculated the travelling carriage that will propagate into other by specific travelling carriage and use for them.
4) there be new arrival in new (new arrival)-this information unit notice that arrives on this current channel.This information can be used in the dynamic renewal of the MS address list in this network.
5) station location-this information unit or according to their controlled channel number or notify the position of specific radio station according to ad-hoc networks route map.This network Route Selection map be describe in detail each equipment how with the map of devices communicating every other in this network, promptly which intermediate equipment must be utilized to realize the communication of desired scope.This can also be used to dynamically upgrading the MS address list.
6) what is taking place in alternate channel activity-this information unit indication on other channel.There is not or exists calling on the alternate channel that this information may be used to indicate the MS in this current channel to add.
MS in network understands this environment (being radio state, user mode and user profile) with one in two methods.First method is a passive means, and wherein MS is based on the current channel monitoring activity that is configured to utilization, and pack processing is contained in the information in any input PAM grouping.Second method is an active method, and wherein MS is to asking other the MS of information specific such as ＂ radio position finding radio directional bearing ＂ to carry out ＂ pings ＂ to them in system.
Fig. 3 describes the action of being taked by when MS connects network.In this case, this network is an ad-hoc networks, but identical concerning possibility by the network of foundation structure control.When the MS of the PAM grouping that is required to broadcast it was transferred to new channel, it spent some time monitorings and analyzes the PAM signaling grouping of just going up broadcasting at that channel (functional block 302).This MS discerns in the PAM signaling grouping what information should be included in it so that replenish the information that exists best then, rather than duplicates its (functional block 304).MS also can select to relay the content of the PAM grouping broadcasting that MS a long way off initiates in the hope of maximizing the overlay area of this shared information.The information of being relayed by near MS can not relayed in this way by the MS of this up-to-date adjustment.
For example, the PAM signaling of the channel activity of some alternate channels 1 on 3 in being described in network grouping is during by another MS broadcasting in the area of closing on, and the MS that connects network can select to broadcast the information relevant with three other alternate channels 4 to 6.Yet, when the PAM signaling grouping that is described in the channel activity of channel 1 on 3 has been broadcasted by MS at a distance, except that broadcasting this channel activity on the channel 4 to 6, up-to-date connection MS also can select to relay the channel activity on channel 1 to 3.This selection may guarantee that this information relevant with channel 1 to 3 spreads all over the broadcasting area of the MS of this up-to-date adjustment.
The last step that is adopted (as setting forth in functional block 306) is MS its information selected of going on the air.This broadcasting is to carry out with any one method of having discussed.
Whether should relayed information for decision, concerning MS, be necessary to determine itself and be considered to geographic distance between other MS of broadcasting of needs relay.Can adopt any feasible method of determining this distance.Yet two methods of planning to use are described below.
First kind of geographic distance method of estimation comprises: global positioning system (GPS) position of the MS of this grouping of broadcasting in each PAM grouping, or the indication of such position is appended to this grouping with some mode.The MS that receives then calculates the distance of the GPS position from that GPS position to it.Gps receiver is essential to the proper operation of this method of estimation.This receiver may be the parts of MS, or the annex that adds on.
Second method is made up of the distance that the MS that receives calculates the quality of reception of the PAM signaling grouping that has received.This quality can be determined by bit error rate (BER) (BER) and signal strength signal intensity.
Can be clear that from above Sharing Information has been removed necessity of all features of the environment of analyzing it from concerning each MS in the proprietary communication net in this way.Similarly, the shared information between peer device is convenient to select optimum channel to transmit.For example, in the ad-hoc networks of six channels that comprise three broadcast channels and three receive channels of demonstrating, if MS wishes to upload carry information at its current channel that will be tuned to, but that channel busy, and shared information can be indicated alternate channel to be idle and can be used.Therefore MS can rather than wait for that current channel becomes the free time in the alternate channel transmission, may conflict with also want the other MS that transmits on that channel then, and described MS in addition needs further to wait for again.The channel of suitable use may use an algorithm to determine, this algorithm utilize from around MS or the suitable weighted array of one or more information units of collecting from this network infrastructure.In addition, via MS (one or more) transmission of centre, described another MS is outside first MS broadcasting area from a MS to another MS for the structure of address list and the permission of reciprocity route map.The structure of this address list and map depends on Sharing Information.
The situation (no matter being foundation structure special or control) that Fig. 4 illustrates an above network 404,406,408 is at present around the position of a specific MS 402.In this scheme, importantly want the MS that transmits to determine which access system (and/or corresponding network) is suitable for transmitting most.There are two kinds of methods to determine to utilize which access method or network.First kind comprises near the travelling carriage the inquiry, and is described below with reference to figure 5.
Be positioned at the geographic area 404 that covers by this system more than when having the travelling carriage 402 that is connected to an above wireless communication system ability, 406, in 408 and when wishing to be suitable for the transmission of this system and access plan more than, this equipment 402 must be selected.This selection comprises: judgement should be used which current access plan and carry out based on a cover standard.The execution (implementation dependent) of will greatly being correlated with of this standard, but can comprise ＂ present load ＂, ＂ interview expenses ＂, ＂ current service mass parameter ＂ and ＂ battery life ＂ in system or the like.
For carrying out this selection, this MS sends request to information near MS 410 (functional block 502).This request is to the request of information and is sent to current MS with the calling of setting up with relevant system.This request is transmitted on one or more suitable channels, and described channel can comprise near the general channel of all systems in this, or the suitable channel that is defined in each system.Near the information (functional block 504) of the equipment response request in suitable Return Channel described then.
Such as function of reference frame 502 and 504 detailed description cross, be that promptly MS directly communicates by letter to MS by the mode of direct communication between the travelling carriage on the direct mode radio channel in the communication between each MS.This needs to relate to network infrastructure in no instance, if but suitablely also can relate to.
Based on the information that returns to it by near MS 410, want the MS 402 of the information that transmits to select optimal access method or certain methods (functional block 506).This selection is by determining which methods availalbe satisfies relevant standard and selects them to realize.Final step will be connected on selected network or some networks via selected access method or certain methods (functional block 508).
As mentioned above, the execution of being correlated with based on the standard quilt of the decision of being made.Yet it is by producing the maximum transmitted scope definition of the MS of information request that MS is considered to nearby zone.All MS in that scope are considered to nearby.
In order to operate this process, require all MS can use based on the standard of setting up decision.This can be provided by the standard of time division duplex (TDD) pattern that is used for third generation collaborative project (3GPP) system.New standard should comprise that the chance that can use this process divides (ODMA) technology of multiple access (opportunity divisionmultiple access).For instance, may set up by the equipment that inquiry is used for the vicinity of quality of service information to the relay path of base station.Which the MS of solicited message uses relay the path based on this information decision then.
Determine that second kind of possible method which kind of access method/network should be used to transmit is usually with described identical with reference to figure 5.The main distinction is not to be near the travelling carriage of inquiry, but the request of information is sent to nigh network.Network is collected institute's information requested and it is returned to this equipment that carries out this request near the data flow of the equipment that communicates with.Therefore, data flow must comprise positional information, this access system identifier and with the relevant embedding data of the current service quality that has of relevant device.
The form that sends request in the method is by relevant execution.It may be the request at the centralized intelligence of the relevant information of the visit data flow of carrying on each access system.In other words, may be at the intelligent agent that itself can collect institute's solicited message (intelligent agent) in the overlay area of each system or each system.
The advantage of second method be its eliminate expend power and frequency spectrum possible tediously long, make the more complicated direct mode radio communication of MS equipment (being that MS is to MS).Yet complexity is much larger than first method.
This method of two provides the advantage that allows suitable MS to set up and utilize the access method of the communication conditions that provides optimum.This can determine by the combination of best service quality, least cost or the like or standard, and the communication that allows the present still impossible method of usefulness to optimize.
Although generally speaking described said method with reference to specialized system, the reader should be understood that and these methods can be applied to the communication system of utilizing fundamentals of management structure in the same manner to application similarly.Equally, be to be understood that the equipment that can carry out said method is included in the scope of the present invention.The declarative description of this equipment is as follows.
Fig. 6 is according to the present invention, illustrate wireless communication system 10 an example global schema.The travelling carriage 2,4 of Fig. 6 can be communicated by letter with base station 8 with 6.Travelling carriage 2,4 and 6 is mobile phone.In addition, they PMR radio station be vehicle-mounted portable radio or mobile radio unit.
Each travelling carriage as shown in Figure 6 can be by base station 8 and one or more other mobile communications.If travelling carriage 2,4 and 6 can be operated with direct mode, they can be directly and another and other mobile communications so, and need not be through the communication link of base station 8.
Fig. 7 explanation is according to travelling carriage of the present invention (MS).The travelling carriage of Fig. 7 (MS) is a radio communication equipment, and may be portable or mobile radio unit or mobile phone.
The travelling carriage 2 of Fig. 7 can transmit voice from the user of travelling carriage.Travelling carriage comprises the microphone 34 that is provided for this travelling carriage transmission signals.Signal from microphone is transmitted by transmission circuit 22.Transmission circuit 22 transmits via switch 24 and antenna 26.
Travelling carriage 2 also has controller 20 and read-only memory (ROM) 32.Controller 20 is microprocessor.
ROM 32 is read-only storages, a non-volatile EEPROM (Electrically Erasable Programmable Read Only Memo) (EEPROM).ROM32 via line 30 is connected to controller 20.
The keypad 44 of a part that the travelling carriage 2 of Fig. 7 also comprises a display 42 and serves as the user interface circuit of this travelling carriage.At least the keypad of this user interface circuit part can be activated by this user.Also can use the voice activation switch (voice activation) of this travelling carriage.Similarly, can use interactional other equipment, for example touch-screen with the user.
The signal of being received by this travelling carriage is routed to receiving circuit 28 by this switch.The signal that is received is routed to controller 20 and audio frequency process circuit 38 from receiving circuit 28.Loud speaker is connected to audio circuit 38.Loud speaker 40 forms another part of this user interface.
One data terminal 36 can be provided.Terminal 36 provides and comprises the signal that is used for by the data of transmitter circuitry 22, switch 24 and antenna 26 transmission.The data that received by receiving circuit 28 also can be provided for terminal 36.For clarity, this annexation is deleted from Fig. 7.
Be to be understood that the present invention only described by example, and can comprise within the scope of the invention the modification of details.
Claims (24)
1. a method for communicating of optimizing on one or more wireless communication systems is characterized in that wanting the information of the residing environment of travelling carriage of the information that transmits to determine transmission course according to relevant.
2. the method for claim 1 determines that wherein described transmission course comprises wireless/wireless radio channel or the access method of selecting to be used for described transmission.
3. as the described method of above any one claim, the information of wherein said relevant this environment comprises radio station's situation and channel/system use information.
4. as the described method of above any one claim, wherein said information is that other MS from travelling carriage zone on every side collect.
5. as the described method of above any one claim, wherein said information is to obtain through a network of the residing overlay area of described MS or a plurality of network.
6. as the described method of above any one claim, share among the MS in the wherein said information in a network.
7. as the described method of above any one claim, wherein said information is to be shared, to receive by one or more MS broadcasting and by all MS in a particular range by reciprocity help information (PAM) signaling group technology.
8. method as claimed in claim 7, wherein a MS monitors this PAM grouping, and when it wants to transmit, definitely should use in a plurality of possible channels which.
9. method as claimed in claim 8 wherein uses an algorithm to determine the described channel that will be used, and described algorithm utilization is from any weighted array of the single or some or all of information units of MS on every side or the collection of described network infrastructure.
10. as the described method of above any one claim, wherein when adjusting to new wireless channel, have the MS execution in step of PAM broadcast-capable:
Monitor and analyze the PAM signaling grouping of broadcasting (302) by near the MS it;
The information of the described information that additional described this PAM grouping that has been broadcasted of identification is carried; And
Broadcasting comprises the PAM signaling grouping (306) of the described information of having discerned.
11. method as claimed in claim 10, wherein side information comprise be not the information in MS, broadcasted and by on the geography away from the MS broadcasting of the MS of this up-to-date adjustment and information that do not relay by in its vicinity MS.
12. method as claimed in claim 11, wherein geographic distance can use global positioning system (GPS) information or bit error rate (BER) (BER) and signal strength signal intensity to determine.
13. as the described method of above any one claim, wherein this information comprises current channel status, alternate channel activity and the information relevant with the MS position.
14. method as claimed in claim 13 wherein selects to be suitable for most channel transmitted according to the state and the activity of all available channels in described network.
15. as above any one right information requires described method to the request of information, comprises step, MS:
Transmission is arrived near travelling carriage (502) to the request of information;
Reception and estimation are to the response (504) of described request;
The optimal access method that selection is used to transmit or a plurality of access method (506); And
Be connected to suitable system or a plurality of suitable system (508).
16. method as claimed in claim 15, wherein near equipment is by can be via the device definition of direct mode radio channel communication.
17. as claim 15 or 16 described methods, wherein said request to information can comprise expense to the present load in system, access system, the current service mass parameter relevant with system and a request of battery life.
18. as any one described method in the claim 15 to 17, wherein determine connected system whether to be based on that a cover standard carries out, and if a system satisfy these standards, then this system is considered suitable for described MS.
19., comprise this step, MS as the described method of above any one claim:
Transmission to the request of information to the network in its residing overlay area;
Receive and estimate described network response;
The optimal access method that selection is used to transmit or a plurality of method; And
Be connected to a suitable system or an a plurality of system.
20. method as claimed in claim 19, wherein said request to information can comprise expense to the present load in system, access system, the current service mass parameter relevant with system and the request of battery life.
21. method as claimed in claim 20, wherein said network obtains this information near the data flow of the travelling carriage that communicates with.
22. as any one described method in the claim 19 to 21, wherein whether decision connects a system and be based on that a cover standard carries out, if a system satisfies these standards, then this system is considered suitable for described MS.
23. utilize a kind of system of any one method in the claim 1 to 22.
24. be used to optimize a kind of system of the communication on one or more wireless communication systems, wherein want the information of the residing environment of travelling carriage of the information that transmits to determine transmission course according to relevant.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0010598.1 | 2000-05-03 | ||
| GB0010598A GB2362069A (en) | 2000-05-03 | 2000-05-03 | Optimising communication wherein a transmission procedure is determined according to information about the environment in which a mobile station is located |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1428060A true CN1428060A (en) | 2003-07-02 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01808853 Pending CN1428060A (en) | 2000-05-03 | 2001-05-03 | Wireless communication system and method |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP1281287A1 (en) |
| CN (1) | CN1428060A (en) |
| AU (1) | AU766859B2 (en) |
| GB (1) | GB2362069A (en) |
| WO (1) | WO2001084870A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101057203B (en) * | 2004-09-14 | 2010-08-18 | 德国捷德有限公司 | Portable device for clearing access |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6735417B2 (en) | 2002-08-15 | 2004-05-11 | Motorola, Inc. | Method and apparatus for relaying information in an AD-HOC network |
| GB2411791B (en) * | 2004-03-01 | 2008-05-14 | Motorola Inc | Communication unit and method of identification |
| FR2879392A1 (en) * | 2004-12-15 | 2006-06-16 | St Microelectronics Sa | Mobile telephone for use as walkie-talkie, has central processing unit to controls transceiver units, digital signal processing circuit, walkie-talkie function managing circuit, digital/analog converter and analog/digital converter |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5802502A (en) * | 1993-05-24 | 1998-09-01 | British Telecommunications Public Limited Company | System for selective communication connection based on transaction pricing signals |
| GB2313256B (en) * | 1996-05-17 | 2000-08-23 | Motorola Ltd | Method and apparatus for system selection |
| GB2356322B (en) * | 1996-08-02 | 2001-07-25 | Motorola Ltd | Method of determining communications mode |
| ID24678A (en) * | 1997-06-06 | 2000-07-27 | Salbu Res & Dev Pty Ltd | OPERATION METHOD OF A MULTI STATION NETWORK |
-
2000
- 2000-05-03 GB GB0010598A patent/GB2362069A/en not_active Withdrawn
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2001
- 2001-05-03 CN CN 01808853 patent/CN1428060A/en active Pending
- 2001-05-03 AU AU67408/01A patent/AU766859B2/en not_active Ceased
- 2001-05-03 WO PCT/EP2001/005086 patent/WO2001084870A1/en active IP Right Grant
- 2001-05-03 EP EP01945088A patent/EP1281287A1/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101057203B (en) * | 2004-09-14 | 2010-08-18 | 德国捷德有限公司 | Portable device for clearing access |
Also Published As
| Publication number | Publication date |
|---|---|
| GB0010598D0 (en) | 2000-06-21 |
| AU6740801A (en) | 2001-11-12 |
| WO2001084870A1 (en) | 2001-11-08 |
| AU766859B2 (en) | 2003-10-23 |
| EP1281287A1 (en) | 2003-02-05 |
| GB2362069A (en) | 2001-11-07 |
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