CN1154243C - Apparatus and method for dynamically selecting transmitter for directed message delivery - Google Patents

Abstract

Apparatus and method for dynamically selecting a transmitter for directed message delivery in a messaging system (100) including plural transmitters (107-111) operating in a simulcast or non-simulcast mode. A communication system (1100) dynamically selects transmitters (1115) by sending transmission signals, receiving the transmission signals at a PMU (1105), calculating signal strengths of the transmission signals, transmitting a signal indicative of the signal strengths, receiving the signal and determining therefrom carrier-to-interference (C/I) values indicative of relative strengths of the transmission signals at a controller (1110), and delivering a message with a selected transmitter associated with a lowest C/I value that is chosen from the C/I values and that exceeds a C/I threshold value.

Description

Dynamic Selection is used for transmitting the apparatus and method of the transmitter of directed message

Technical field

The present invention relates to radio communication, specifically one of Dynamic Selection is used to transmit the apparatus and method of the desirable transmitter of message in communication system.

Background technology

Wireless communication system or message system are known.This type systematic generally comprises the transmitter of emission message, receive message elements (Mu) or portable messaging unit (PMU) of message, the controller of control messages transfer operation and be coupled to the terminal or the gateway of the public reciprocal exchange of business such as phone or Internet system.This type systematic uses the radio hookup emission mode to transmit message usually.Simulcast mode is represented the situation of all transmitters while activities on same radio frequency in the area.In order to simplify, and can successfully communicate by letter with simulcast mode really, must extreme care to guarantee that the modulation to the wireless signal of and position that signal strength signal intensity that arrive each signal equate that send from different transmitters is phase coherence or homophase.Equating here, refer to signal strength signal intensity the capturing than interior or near capturing ratio of common message elements, maybe when use frequency modulation concerning many message receivers in about 6dB.

Proved that radio hookup operates in that to arrive the message receiver aspect be positioned at some unknown position of major region very effective.Yet, except that the transmission Anywhere in system or launch the single message, owing to the employed radio frequency of system can not may limit the capacity of the message transmission system of the radio hookup operation that places one's entire reliance upon inadequately again for any purpose is used simultaneously.The practitioner has realized that the position of understanding message elements will allow the part of system, and for example a transmitter is launched message to the message elements of expectation.Simultaneously, the other parts of this system, for example other transmitter can be used for other task (for example transmitting other message to other message elements) and can not produce interference, thereby utilizes power system capacity better.

After recognizing this point, some system adopts unique digit recognition (ID) signal or code to each transmitter that covering is provided in a zone.These digital identification signals or digital color code are from each transmitter radio hookup, and the message elements with address of the match messages of launching with radio hookup is beamed back the report that it has received this numeral ID to this system.After this, this system attempts only utilizing the transmitter that has this numeral ID to transmit further or additional simultaneous message to this unit.A kind of operator scheme in back often is meant the operation of orientation or directed transmission or non-radio hookup.Though use digital color code can provide large-scale directed message to transmit, and reuse system frequency on therefore intrasystem other emission function certain degree, these systems have still kept some defective or restriction.

For example, if received two signals that have the approximately equal amplitude separately, phase mutual interference and who digital color code can not be recovered exactly.In this case, message elements can not determine which transmitter is providing covering.In either case, when only recovering individual digit ID, the position that it is illustrated in message elements provides preferably or the transmitter of peak signal.Have will losing of its respective digital ID, even more weak signal has enough signal levels fully than weak signal.In this case, may lose the potential chance that transmits (contemporaneous) the directed message same period to two message elements, cause the utilance of system to reduce.Clearly, need a kind ofly dynamically select a suitable transmitter to transmit directed message so that effectively utilize the method and apparatus of system resource.

Summary of the invention

The present invention relates to communication system, comprise message system, message sending unit (MU) or portable messaging unit (PMU) of selective message system and this system, and the method in these systems, all these relate to a kind of scheme of improving and inventing, to determine and to select a suitable transmitter or emission unit, directed message is sent to the user message unit.A kind of method for optimizing and corresponding message system of selecting the transmitter of transmission directed message in the message system of simulcast mode active configuration and formation is discussed.This method comprises: detection comprises first signal of a basic parameter and one first identification signal and comprises this basic parameter and first and second transmitters of the secondary signal of one second identification signal that with the simulcast mode emission wherein first identification signal and second identification signal differ first and second scheduled volumes with reference signal respectively respectively; Base station receiver receives an affirmation signal that is included in the first definite identification signal of a message elements position with respect to the intensity indication of second identification signal, this intensity indication is corresponding to selecting from first and second transmitters, so that directed message is sent to the preferred emission machine of this message elements.

After determining the preferred emission machine, can further launch message with non-simulcast mode to this message elements from this transmitter.The preferred form of basic parameter or reference signal and identification signal comprises a benchmark single-tone (tone) and a plurality of identification (ID) single-tone, wherein each such single-tone is distributed to a transmitter uniquely, so that any two transmitters in the given message elements communication range do not have identical identification single-tone.As an alternative, basic parameter or reference signal can be any signal attributes that only comprises the carrier frequency in the relative high frequency constancy system, as long as some characteristic of reference signal is known, all similar to all transmitters, and the non-linear effects the capture effect (capture effect) that is not subjected in phase modulation communication system, to run into.Though identification signal is single-tone preferably, can be any orthogonal signalling also, comprise for example window single-tone (windowed tone).

Can consider to have separately the various forms of intensity indications of some practicality.First kind of form all identification single-tones that receive in message sending unit and a threshold ratio, and report all or a plurality of identification single-tone that satisfy condition, and another kind of form is only reported the strong or the most best single-tone of being determined by the weighted average of a plurality of transmitting boundaries preferably, and as a subscriber computer, all ungratified situation of transmitter ID single-tone that report at least impliedly receives.Under in the end a kind of situation, can suppose to postpone further message or alternatively, launch with simulcast mode for the message elements of this situation of report.

Another kind of method for optimizing and corresponding message elements or the selective message unit that is identified for transmitting to message elements the desirable transmitter of message also is discussed.This method comprises: receive the network signal that comprises a basic parameter or signal, first identification signal and second identification signal, wherein first identification signal and second identification signal on spectrum intervals preferably and reference signal differ first and second scheduled volumes respectively, this first and second scheduled volume corresponds respectively to first transmitter and second transmitter; Relatively first identification signal and second identification signal are to provide the intensity indication; Comprise the signal that the transmitter corresponding with this intensity indication discerned with emission.For this method, by corresponding result, to benchmark and the corresponding preferred form that adopts of identification signal as following further discussion.

According to preferred message of the present invention system comprise a plurality of with simulcast mode or non-radio hookup, reuse the transmitter that pattern work is disposed and constituted.This system comprises: one first transmitter, be used for simulcast mode emission comprise a basic parameter or signal and differ with this reference signal or frequency spectrum on be separated by first signal of first identification signal of first scheduled volume; One second transmitter is used for comprising with simulcast mode emission the secondary signal of second identification signal of second scheduled volume of being separated by on this basic parameter and and this reference signal spectrum; A base station receiver, be used to receive the affirmation signal that comprises the intensity indication corresponding with the comparative result of first identification signal of determining a message elements position and second identification signal, wherein the intensity indication is corresponding to the preferred emission machine for selecting from first and second transmitters to this message sending unit transmission message with non-simulcast mode.This system preferably comprises a controller that is coupled to all transmitters and base station in addition, is used to control this system and with radio hookup or non-simulcast mode arrangement or commander emission.Use the similar preferred form of benchmark and identification signal and derive analog result.

Description of drawings

The content that is considered to new characteristic of the present invention all is summarized in the appending claims of back.Yet, can be by understanding the present invention and further advantage thereof with reference to the accompanying drawings best, wherein:

Fig. 1 has described message system according to the preferred embodiment of the invention with a kind of canonical form;

Fig. 2 shows the spectrum curve of a typical identification signal;

Fig. 3 shows the spectrum curve of second typical identification signal;

Fig. 4 has described to be suitable for according to the present invention the preferred block diagram of the message elements that uses in the system of Fig. 1;

Fig. 5 illustrates the part that is suitable for using and transmits the channel frame structure in the message system of Fig. 1;

Fig. 6 has described the typical received spectrum that the message elements of Fig. 4 of using detects in the system that is suitable at Fig. 1;

Fig. 7 has described from the flow chart of the method for optimizing of the viewpoint operation of Fig. 1 system;

Fig. 8 has described from the flow chart of the replacement method embodiment of the viewpoint of Fig. 4 message elements;

Fig. 9 is the operational flowchart of the transmitter that comprises in the controller of Figure 17 according to the present invention;

Figure 10 is the circuit block diagram of the PMU that comprises in the communication system of Figure 11, is used for the indication of calculating the C/I value according to the present invention and the transmitter grouping being provided to controller.

Figure 11 is the communication system schematic diagram that transmitter is grouped into the repeated use group according to Carrier interference ratio (C/I) value relevant with the single-tone of being launched by transmitter according to the present invention.

Figure 12 and 13 is the schematic diagrames that can be grouped into the transmitter of Figure 11 different repeated use groups according to the present invention.

Figure 14 is the circuit block diagram of portable messaging unit, and the controller that is used for comprising to the communication system of Figure 11 according to the present invention provides the signal strength signal intensity that receives single-tone.

Figure 15 is the flow chart of the processor operations that comprises in the PMU of Figure 14 according to the present invention.

Figure 16 is the flow chart of the measuring appliance operation that comprises in the PMU of Figure 14 according to the present invention.

Figure 17 is the circuit block diagram of the controller that comprises in the communication system of Fig. 1, is used for calculating according to the present invention C/I and transmitter is divided into reusable group.

Figure 18 is an operational flowchart of describing the calculator that comprises according to the present invention in the controller of Figure 17.

Embodiment

In order more to be expressly understood the present invention, ask the reader referring to describing to represent message system (100), preferably Fig. 1 of selective message system.Message system comprises the gateway or the terminal (101) that are coupled to the message resource such as public switched telephone network (103).This terminal can be from the WMG of Motorola ^TMProduct and other manufacturers place obtain.Terminal is coupled to system controller (105), for example RFC of Motorola ^TMOr CONDUCTOR, and this terminal is often relevant with system controller.Terminal and system controller are worked together, to the system controller conveyer belt message of address on purpose, or get back to the various responses of terminal from PSTN and transmitting terminal.

Message system comprises a plurality of transmitters, three transmitters among the figure be depicted as first, second and n transmitter (107,109 ..., 111).Transmitter can use the NUCLEUS II of Motorola ^TMTransmitter, and by departures network channels (113) be coupled to system controller.The telephone wire preferably rented of departures network channel, but can be any suitable networking by comprising Radio Link or any suitable medium of communication protocol work.This system, particularly controller and transmitter are with radio hookup and non-simulcast mode active configuration and formation.Infer the modulation of all carrier waves of sending at all transmitters phase coherence basically so that simulcast mode work is normally known, and this launches identical message simultaneously and realizes by guaranteeing all transmitters.To be one or more transmitters operate in mode independently in non-radio hookup operation, thereby may increase power system capacity by the repeated use of transmitter.Such as being commonly used to provide with broadcasting the operation particular device based on satellite or the gps system relevant or the required levels of precision of radio hookup operation to timing information is known, so no longer further relates to and discuss, and does not illustrate especially.

Usually, system controller provides control to system, comprises carrying out scheduling to preparing to deliver to message registered or that subscribed the message elements (for example two unit (115,117) shown in the figure) of system business.These forwards are to transmitter, so that transmitting or upward emission of departures wireless channels (119) according to system protocol a specific period subsequently.In addition, message system comprises a plurality of base station receivers, for example passes through two base station receivers (121,123) that inbound or network channel (125) is coupled to system controller shown in the figure.The message of sending that send at message elements or spontaneous or the reception of response message and the message sent, be coupled to one or more base station receivers by reverse or inbound wireless channel (127), at this, on inbound or network channel these forwards or relay system controller.System controller can use these inbound messages to carry out the scheduling decision, or can be forwarded to terminal to them, if for example prepare they is delivered to customer objective ground.

Specifically, the message system in the operation comprises first transmitter (107), is transmitting upward emission first signal of channel (119), the preferably wireless signal of FM modulation with simulcast mode.Spectrum curve referring to Fig. 2, first signal comprises reference signal (201) and first identification signal or by reference signal (201) and the modulation of first identification signal, reference signal is the benchmark single-tone of 1000Hz preferably, first identification signal is unique first transmitter identification single-tone of 1200Hz preferably, with described reference signal on frequency spectrum, be separated by first scheduled volume, preferably 200Hz.Equally, comprise with simulcast mode and on the forwarding channel, launch the second, preferably second transmitter (109) of the wireless signal of FM modulation.Spectrum curve referring to Fig. 3, secondary signal comprises the reference signal (201) and second identification signal, or by the modulation of reference signal (201) and second identification signal, second transmitter identification single-tone of 1400Hz preferably with reference signal on frequency spectrum, be separated by second scheduled volume, preferably 400Hz.Put it briefly, its corresponding signal can be broadcasted by its corresponding identification single-tone and common reference parameter in many base stations, at this, and can be by distinguishing single-tone and each transmitter according to the receiver in the shared area of coverage of the inventive principle work of this discussion.Considered nearly 30 different identification single-tones, all identification single-tones are preferably distinguished 200Hz at interval.

In general, in the message system of a reality, a plurality of transmitters are all with the simulcast mode emission, and each transmitter has unique identification signal of a preferably unique transmitter identification single-tone, with a common reference parameter or reference signal, preferably benchmark single-tone.System controller is responsible for the unique identification signal of each base station assigns in base station group or group, only utilizes the repeated use principle of knowing to redistribute identical identification signal from the spatial diversity system such as cellular system in different groups.Optimum decision system is predetermined message system (scheduled messaging system), for example according to the ReFLEX of the improved Motorola of inventive principle disclosed herein ^TMOr inFLEXion ^TMSystem.This system has for example shown in Figure 5 by transmitting frame and the time slot that wireless channel constitutes.

Fig. 5 illustrates preferred frame structure (500), and for example when system had the message that will transmit and needs to understand the location of destination message elements, simulcast mode was launched this frame structure every now and then.This frame structure comprises one first sync section (501), the remainder (505) of one second sync section (503) and this frame.Sync section provides enough information to transmitting wireless channel, to allow frame, word and the bit synchronous relevant with message elements, also providing such as realm identifier (zone identifier), frame number, cycle numbering (cyclenumbers) etc. simultaneously may be the necessary overhead information relevant with agreement of work in the system, but does not further relate at this.The remainder of frame comprises message sending unit address and the progress msg (schedulinginformation) of each message elements on forwarding and reverse wireless channel.

First sync section is that 90 milliseconds (ms) is long, and preferably launches with 1600Bps.This part comprises that a duration is 10ms or identification that is equivalent to 16 bits or color code part (507).By test, this duration successfully changes to any precalculated position that reaches 40ms and can be included in frame structure from 5ms.Radio hookup was launched during above-mentioned identification signal in given base station area or group, unique code specifically, this signal of each base station were preferably in part (507).

Top network signal may be received as network signal by message elements (MU) (for example message elements (117)).Block diagram referring to Fig. 4, this MU is based on digital signal processor (DSP) and ideal (desirable) transmitter configuration and formation to be identified for transmitting message, this MU comprises: a receiver (403), be used to receive network signal, network signal comprises the reference signal (201) that structure addition (constructive addition) back is detected, first identification signal (203) by the path loss detection, with second identification signal (303) that detects by path loss, wherein preserved institute and had any different, for example the spectrum intervals between basic parameter and the identification signal.

MU also comprises, here only show a part that links to each other with receiver (403), a buffer (405) and comparator (408), be used for co-operation with comparison signal intensity or quality, preferably first identification signal and second identification signal are so that provide indication or intensity instruction signal at output (406).Comparator is selected the suitable index signal corresponding with relevant transmitter identification signal, and index signal is offered MU transmitter (407).MU transmitter (407) is oppositely being launched the signal that comprises this indication or intensity instruction signal and transmitter identification on the wireless channel.Put it briefly, after this further to command the destination be the message of this MU to system controller (105), and therefore and by this MU with non-simulcast mode from the transmitter reception corresponding with this indication or transmitter identification.

Receiver (403) is mainly based on DSP, and is coupled to based on the Motorola 68300 or the similar controller (409) of series microprocessor, and controlled by controller (409).Controller (409) is carried out inventive principle known or that be given in this discussion and is noted such as correct operating function, regularly, behind the radio management normally known such as synthesizer frequency setting, be easy to the software program by the those of ordinary skill exploitation.Receiver also comprises a RF front end (411) that is coupled to antenna (402), and RF front end (411) is worked with filtering, amplifies and given frequency carrier signal, the baseband signal of demodulation carrier wave to provide all to know be provided.When receiving the visual message that maybe can listen that is assigned to that the user consumes, switch (413) is routed to message handling device (415) and user I/O (417) to message.In addition, all message of reception are coupled to the analog-digital converter of knowing (419) with baseband format, in this speed with per second 8 bits 51.2 thousand they are sampled.

According to 128 that know or handle these sampling or word according to 256 rapid fourier changes (FFT) functions (421) as an alternative.The network signal that receives preferably includes the pattern of first and second transmitters identification single-tone of the benchmark single-tone pattern of basic parameter or signal and first and second identification signals.If like this,, cushion and store the result (600) of this FFT by buffer (405) referring to Fig. 6.These results preferably include amplitude peak (601) and corresponding position (603), for example are labeled as f ₁-f ₁₂The identification signal of appointment or identification signal frequency spectrum such as the first, the second of single-tone with respect to the position of basic parameter (606) or benchmark single-tone spectrum.In a preferred form, in each computing of FFT function, this result is coupled to buffer (405), preferably keeps in buffer (405) or stores last a plurality ofly, and for example eight operations moves about or rolling weighted average or summation.A kind of simpler method is only to store last result, though reliability may reduce.

Weighting allows to provide the measured value of the result or the bigger effect of renewal, and a plurality of measured value has illustrated the various unusual of wireless channel, for example decay.Made a simple linear weighted curve model with satisfactory result, the measured value that wherein provides renewal is the twice of weighting that has the oldest measured value of the median that receives weighting in the middle of the linear correlation.Can adopt complicated weighted curve, for example index or how much weighted curves upgrade and the effect of older measured value so that more carefully form.Just as noted or the hint, comparator by scanning and amplitude peak or its weighted sum of relatively all receptions and select one suitable or acceptable, preferably in these peak values or the summation best or the strongest one indication or intensity instruction signal are provided.As a kind of replacement, can report all acceptable peak values or summation or indication for report highest peak value.

Also hypothesis shows the strongest identification signal from the single result's of FFT function simple scenario by observing Fig. 6 as an example, is single-tone at this, is f ₁(607) and approaching inferior strong f ₅(609) and f ₆(611).Suppose relation one to one, transmitter 1 (107) shows the strongest signal, therefore, and as the preferred emission machine.Alternative embodiment or comparative example compare the identification single-tone and the threshold value (613) of all receptions, provide then and the corresponding intensity instruction signal of all acceptable identification single-tones, pass through to observe at this, (607,609,611) show acceptable corresponding transmitter 1, transmitter 5, or transmitter 6.Yet, should point out, if system controller attempts utilizing in transmitter 5 or 6 one to transmit directed message to MU, report this state, and attempt simultaneously utilizing another transmitter to transmit message to another MU, since transmitter 5 with 6 the two obviously receive with identical level by the MU of report, can not successfully transmit message probably to the MU of report.As further replacement, if the identification single-tone and the threshold ratio result of all receptions shown that acceptable identification single-tone is not arranged, MU can be still with the order report of this state.System controller will know impliedly that available simulcast mode rather than directed message pattern communicate.

More generally situation is, MU transmitter (407) comprises that one is coupled to the decoder (423) of this indication at output (406), output this indication introduce departures emission bit stream or general known to information.When system addressing MU, this departures bit stream can be represented an acknowledge message, or only as the message of spontaneous generation.Decoder is coupled to encoder and modulator (425), as know like that, modulator is with encoded signals modulation MU transmitter carrier, thereby produces a modulated carrier, amplified and is coupled to antenna (402) by power amplifier (427) as what everybody knew then.Like this, MU, be signal of MU transmitter emission specifically, this signal comprises a transmitter identification corresponding with the strong or the most best identification single-tone of base station or infrastructure transmitter, accept to discern the corresponding a plurality of transmitters identifications of single-tone with a plurality of transmitters a plurality of, perhaps do not have acceptable identification single-tone and therefore do not have acceptable transmitter, this is by all identification signals that comprise first and second transmitters identification single-tone relatively or with predetermined threshold are relatively determined mutually.When observing when not having acceptable identification single-tone, the MU receiver for example can utilize that first and second transmitters further receive emission with simulcast mode.

These emissions from MU are received by one or more base station receivers (121,123) usually.Therefore base station receiver will receive an affirmation signal that comprises an indication, this indication is corresponding to a comparative result of all identification signals that receive at MU, this indication is included in first identification signal and second identification signal that the MU position is determined, and should indication will be for transmit directed message to described message elements corresponding to the preferred emission machine of selecting from first and second transmitters.Base station receiver is forwarded to system controller to this indication, and is launched to the same period of this MU by the controller commander, is born with non-radio hookup or directed transfer mode by the preferred emission machine.

When message or acknowledge message comprised the indication corresponding with the strongest identification single-tone, corresponding transmitter was used for attempting transmitting directed message.When this indication corresponding to by message elements described first and described second transmitter identification single-tone and predetermined threshold comparison and definite a plurality of when accepting to discern single-tone, system controller can select any one transmitter to be used for follow-up directed message.In this case, specific selection may be depended on other system business consideration.If this indication is not corresponding to there being acceptable identification single-tone, system controller need postpone the message of orientation transmission for this MU, or adopts radio hookup to attempt, so that be that this specific MU further attempts the message transmission same period.

Referring to Fig. 7, provide more detailed description to the inventive method embodiment.Set a message system that comprises a plurality of transmitters with simulcast mode active configuration and formation, for example the system of discussing referring to Fig. 1.This method relates to selects a transmitter to be used for transmitting message directed or non-radio hookup to the MU such as the MU that discusses referring to Fig. 4 in these a plurality of transmitters.This method is in 700 beginnings.Step (703) indication distributes identification (ID) signal to each transmitter.As discussed earlier, this ID signal is a single-tone preferably, and is unique for each base station in given how much close regions.Provide the method for this unique distribution from the carrier frequency distribution of the cellular telephone industry that for example has similar problem, to understand.Distributing generally is to utilize system controller to handle by the Systems Operator, so that any further system update or improvement.

After this, step (705) determines whether beginning or arranges new frame.The new frame ＂ of ＂ can be any time cycle or situation about occurring by some relative fixed rule.Under any circumstance, if arrange new frame or other situation, the radio hookup of the corresponding identification signal of step (707) commander emission, identification signal is preferably to unique identification single-tone of radio frequency carrier modulation, comprise basic parameter, preferably Tiao Zhi benchmark single-tone from each transmitter.Preferably the system controller commander is that first and second transmitter is launched first signal that comprises the basic parameter and first identification signal respectively and comprised basic parameter and the secondary signal of second identification signal with simulcast mode at least, and first identification signal and second identification signal and basic parameter differ first and second scheduled volumes respectively.After the step (707), program enters Fig. 8 and returns from Fig. 8 at A (709) and B (711) respectively, preferably discusses as following at A (709) and B (711), is detected and the response network signal by a MU.

At B (711) afterwards, step (713) is preferably from the signal of MU confirmation of receipt signal or other spontaneous generation, and this signal has the relative indication with the corresponding ID signal of preferred emission machine.This signal preferably is included in the indication of the first definite identification signal of message sending unit position with respect to second identification signal at least, this indication is corresponding to a preferred emission machine of selecting from first and second transmitters, so that transmit directed or non-radio hookup message to this message elements.This receiving step preferably carries out in the base station, then the signal forwarding that receives is received to system controller with by system controller.

Specifically, step (713) comprises step (715,717,719), and each step represents to depend on the distinct methods of the specific indication of reception.By relatively more all reception ID signals, when this indicates corresponding to the best determined in the MU position or the strongest ID signal, follow step (715), preferably select to have the transmitter of this correspondence ID signal subsequently by system controller in step (721).It should be noted that the indication from MU can comprise or stipulate this preferred emission machine, but allow system controller be correlated with selection will for future system greater flexibility will be provided.After this, step (725) commands this preferred emission machine to send any further same period of message with non-radio hookup or directed transfer mode to MU.

If by the ID single-tone of all receptions and a threshold ratio are determined that at MU this indication is corresponding to a plurality of acceptable ID signals, advise that then a plurality of acceptable transmitters trials further transmit directed message, enter step (717), in step (717) afterwards, step (723) commander selects a transmitter corresponding with one of a plurality of ID signals.Preferably by system controller execution in step (723), for example business need of other system is depended in final selection.In step (723) execution in step (725) afterwards.When this indicate not regulation ID signal come with this show with threshold ratio than the time when not having acceptable ID signal, enter step (719), then execution in step (727).Step (727) sends to MU with simulcast mode control the further same period.Though the method for Fig. 7 is set in message system, be preferably in system controller and carry out, and implement, thereby be convenient to those skilled in the art according to revising or write in the inventive principle of this discussion by software program.

Fig. 8 has described to be used for determining to transmit to message elements the method for the desirable transmitter of message in A (709) beginning.This method is preferably in MU mainly with implementing according to the software program of writing in the principle of this discussion that obtains easily or be convenient to revise, so that carry out in the controller of MU or DSP.Step (801) receives network signal, preferably launches in step (707).Specifically, network signal comprises basic parameter at least, and first identification signal and second identification signal, first identification signal and second identification signal and reference signal differ respectively respectively and first transmitter and the first and second corresponding scheduled volumes of second transmitter.In step (803), we determine whether this signal comprises the message that will give the user, if comprise, offer the user in step (805) processing and with this message.

In either case, step (807) is partly carried out FFT to the network signal that comprises ID signal and basic parameter (preferably above-mentioned single-tone).Cushion and store the amplitude of the ID signal that obtains in step (809).In optional step (811), upgrade the weighting of ID signal and roll (rolling) on average.Step (813) on average scans and comparison procedure ID signal or weighting rolling, and selects a suitable indication.Step (813) comprises step (815,817,819,821), carries out these steps selectively according to certain embodiments.

Step (815) is passed through the correspondence indication of the strongest ID signal of relatively all ID signals selections and ID signal, and the ID signal is particularly including first identification signal to the second identification signal, so that the indication corresponding with desirable transmitter is provided.As an alternative, step (817) is selected a plurality of ID signals, and each ID signal satisfies the indication of threshold value and its correspondence.If determine not have the ID signal to satisfy this threshold value in step (819), step (821) is selected a blank indication.Under any circumstance, step (813) afterwards, the signal of step (823) transmitting acknowledgement signal or spontaneous generation, this signal comprise the indication of selecting from step (815,817, or 821), handle entering B (711) then.In a word, Fig. 7 and 8 has described to be identified for transmitting with simulcast mode the inventive method of the desirable transmitter of message.The selection transmitter has also carried out after the emission, and MU receives this transmission with non-simulcast mode, comprises the message from the transmitter corresponding with this indication.

Now the above-described inventive method that is used for determine transmitting the preferred and desirable transmitter of directed message is further expanded to transmitter is divided into groups, and selection is used for scope to the desirable transmitter of MU or PMU transmission directed message in this group.Referring to the explanation of following Fig. 9-18, grouping is to realize in the mode that the signal quality of optimizing available transmission message improves or improve usage factor of system resource simultaneously.

Figure 11 has illustrated communication system 1100, comprises one or more portable messagings unit (PMU) 1105, and for example radio receiving-transmitting unit is used for receiving and the emission wireless signal.Communication system 1100 also comprises at least one rf control unit (RFC) 1110, is used for the work of control system 1100.Particularly, the data of RFC1110 reception such as message are so that send to PMU1105.RFC1110 is for example by phone or the modulator-demodulator reception data of telephone network (not shown) from routine.Then, message is offered the one or more transmitters 1115 that comprise in the system 1100 by RFC1110, message as wireless signal transmission.Receiving system 1120 is from the PMU1105 received communication, and the communication link of warp such as special-purpose Wireline or radio communication channel provides this communication to RFC1110.

Referring to Figure 12 and 13, described the possible configuration of transmitter in the system 1,100 1115.As shown in the figure, communication system 1100 comprises a plurality of branches honeycomb in groups, and each group comprises the honeycomb of specific quantity, and transmitter 1115 is launched wireless signal in honeycomb.The explanation of Figure 12 has provided every group 1205, the arrangement of 1,210 three honeycombs promptly reuse these groups according to reusing coefficient 3, and the explanation of Figure 13 has provided every group 1305, the arrangement of 1,310 seven honeycombs is promptly reused these groups according to reusing coefficient 7.Each honeycomb is made up of the predefine district of the transmitting boundary that comprises associated transmitter 1115, and these honeycombs are usually located at and the fixing distance of other honeycomb.Distance between the honeycomb is determined by group's the size and the transmitting boundary of transmitter 1115.Should be appreciated that in any given repeated use group, a transmitter is once only arranged by particular communication channel (for example frequency) emission.Other transmitter 1115 may for example be in off state or launch on different channels.

Though Figure 12 and 13 has described the group of stability of transmitter 1115, the transmitter 1115 that comprises in every group also can change.For example, referring to Figure 12, RFC1110 can be with TX1, and TX3 and TX5 divide in the group of three honeycombs.Referring to Figure 13, RFC1110 can be with TX3, TX4, and TX5, TX6, TX7, TX10 and TX11 divide in the group of seven honeycombs.To describe in detail on the one hand of the present invention this below.

According to the present invention, can be according to transmitter 1115 dynamically being divided into the repeated use group that comprises varying number transmitter 1115 to the information that RFC1110 provides by the PMU1105 in the system 1100.Specifically, each transmitter 1115 in the system 1100 send one with reference frequency and transmit, and send one with another frequency of PMU1105 identification and transmit.Preferably adopt such as the FLEX that knows ^TMThe signaling protocol of agreement and so on transmits message, thus transmitter 1115 at the fixed time during, for example in the selected frame at wireless signal during the emission of the ＂ of synchronous code B ＂ word or send in all frames and transmit.PMU1105 receives the signal of emission, or be at least transmitter 1115 in the scope send that part of.According to the present invention, for example by stored transmit machine identifying information (ID) table and relevant therewith frequency, PMU1105 can make transmitting of reception and send this transmitter that transmits 1115 and be associated.Can by service provider for example or by wireless programming to these ID manual programmings.

Need to be separated from other communications in the system 1100 by only transmitting of providing of transmitter 1115 for receiving PMU1105.It is best by orthogonal signalling to transmit, and for example single-tone is formed.Hereinafter claim to transmit to be single-tone, although available other signal type is replaced.

Can change the requirement of the bandwidth of single-tone and frequency interval with adaptive system.As an example, the frequency tone sent of transmitter 1115 can be arranged in 6.25 kilo hertzs (kHz) and 150Hz frequency bandwidth at interval separately.Therefore, according to this example, in the bandwidth of 6.25kHz, be equipped with 29 (29) individual single-tones.Reuse and the quantity of single-tone can be doubled by the time.For example, comprise that first group of transmitter 1115 of 28 (28) individual transmitters 1115 can be launched single-tone at one group of wireless signal image duration, and comprise that second group of transmitter 1115 of other 28 (28) individual transmitters 1115 can use another framing.As an example, can select the corresponding odd and even number frame of two groups of transmitters.In system 1100, or the quantity of the transmitter 1115 in any specific region of system 1100 is when surpassing 56 (56), reusable if desired single-tone.

According to the first embodiment of the present invention, PMU1105 receives single-tones and measures the power of the single-tone of each reception from transmitter 1115, i.e. signal strength signal intensity.Power directly offers RFC1110 by decibel, so that calculate the value of the Carrier interference ratio (C/I) relevant with PMU1105 thus.The relative intensity of the single-tone that the value representation transmitter 1115 of C/I provides, and be not only each transmitter is calculated, and to each possible emission unit, promptly each possible repeated use coefficient calculates.Then, RFC1110 determines that from the C/I value which particular transmitter 1115 and which specific repeated use coefficient are used to measured value of PMU1105 emission.After this can indicate PMU1105 with its message of which frequency emission.As an alternative, PMU1105 can scan to find out the correct frequency relevant with selected transmitter to come to PMU1105 emission message.When the transmitter in the system 1,100 1115 can be launched on different frequency, RFC1110 preferably also will be used for emission to selected transmitter 1115 which frequency of indication.

According to a second embodiment of the present invention, PMU1105 calculates the C/I value from the single-tone that receives.Send the C/I value by PMU1105 to RFC1110 then, so that RFC1110 can determine to reuse coefficient, promptly three, five, seven etc., the quantity of the particular transmitter that comprises in this expression repeated use group, and be used for determining which transmitter 1115 will be used for to PMU1105 emission message.These two embodiment will describe in detail below.

Figure 14 is the circuit block diagram according to PMU1105 of the present invention.PMU1105 comprises a transceiver 1405, the message that is used for the single-tone of receiver/transmitter 1115 (Figure 11) emission and prepares to be received by PMU1105.By being coupled to transceiver 1405, the processor 1420 that is used to control the operation of PMU1105 is handled single-tone and message.Message memory 1415 these message of storage, frequency database 1430 Memory Reference frequencies and different transmitters 1115 are used for launching the indication of the frequency of single-tone, the transmitter ID of the measured value of the single-tone that 1410 storages of single-tone database receive and relevant therewith transmitter 1115.The device memory 1425 storages address relevant with PMU1105, measuring appliance 1435 is measured the signal strength signal intensity of the single-tone that receives.Measuring appliance 1435 can be realized by the firmware of storage in the device memory 1425 for example, and be carried out by processor 1420.

Figure 15 is the flow chart of explanation processor 1420 operations according to the instant invention.In step 1505, when processor 1420 identifies the synchronization character of wireless signal of reception, start measuring appliance 1435 in step 1510.In step 1515, when synchronization character finishes, the content of single-tone database 1410 (Figure 14) is offered RFC1110 (Figure 11) through transceiver 1405.In step 1635, find to find out further single-tone by reference frequency database 1430, handle and continue in step 1615.Otherwise, wait for that processor 1420 restarts measuring appliance 1435, in this case, handle and continue in step 1605.

Figure 16 is that measuring appliance 1435 is at the flow chart of step 1605 in the operation of reference frequency search single-tone.In step 1610, when finding the reference frequency single-tone, measuring appliance 1435 attempts finding next single-tone in step 1615.After this, measure the power of the next single-tone that finds in a usual manner in step 1620.In step 1625, reference frequency database 1430 to determine which transmitter 1115 is relevant with the single-tone that finds, in step 1630, is made the suitable entry that comprises transmitter ID and signal strength signal intensity thereof in single-tone database 1410.

Next referring to Figure 17, the circuit block diagram according to RFC1110 of the present invention is shown.RFC1110 comprises a receiver 1745, is used for receiving from PMU1105 the content of single-tone database 1410, and FPDP 1705 is used to be coupled to a transmitter 1115 and a CPU (CPU) 1710, is used to control the operation of RFC1110.FPDP 1705 also can be coupled to the telephone network (not shown), is used for receiving the message that preparation allows the interior PMU1105 of system 1100 (Figure 11) receive.

Emission database 1715 is coupled to CPU1710, is used to store the message that preparation is received by PMU1105, and CPU1710 is coupled in power data storehouse 1720, is used for storing the power measurement values that is turned back to RFC1110 by the different PMU1105 of system 1100, i.e. signal strength signal intensity.Controller storage 1725 stores system parameters and system information, user profile for example, expression can make receiving element PMU1105 correctly receive the C/I threshold value of the calculated value of message, with the repeated use information that comprise different repeated use coefficients.When fixing the transmitter relevant with each repeated use group, repeated use information further comprises the emission unit relevant with each repeated use group.Repeated use information can comprise, for example when reusing coefficient and equal seven, and TX9, TX10, TX12, TX13, TX14, TX15 and TX24 form the indication of an independent repeated use group 1310 (Figure 13).Though in the time can changing the composition of repeated use group, it is unnecessary that this information will become.

RFC1110 also comprises a calculator 1730, is used to each PMU1105 of the signal strength signal intensity of returning single-tone to calculate the C/I value of the relative signal intensity of each transmitter 1115 of expression and each repeated use group.Transmitter 1735 dynamically is divided into suitable repeated use group to transmitter, so that launch message in system 1100.Reuse database 1740 and be coupled to CPU1710, be used for the C/I value that storage computation device 1730 calculates.Calculator 1730 and transmitter 1735 are preferably in the firmware of storing in the controller storage 1725 and implement, and are carried out by CPU1710.As an alternative, can use the hardware that to carry out equivalent operation.

According to the present invention, RFC1110 is from PMU1105 received signal intensity, and the C/I value of each the repeated use coefficient that uses from these signal strength signal intensities are fallen into a trap calculation system 1100.As an example, when reusable coefficient is three, five, seven, nine and ten three o'clock (as shown in the figure), be described in more detail as following, being that each PMU1105 that comprises the transmitter repeated use group of three transmitters 1115 calculates the C/I value, is that the transmitter that comprises five transmitters 1115 is reused batch total calculation or the like then.In addition, as mentioned above, the transmitter 1115 that comprises in each repeated use group needn't be fixed.Therefore, not only can be different repeated use coefficient calculations C/I values, and can be the combination calculation C/I value that each reuses transmitters 1115 different in the coefficient.

In case finished repeated use database 1740, RFC1110 determines that for each PMU1105 that transmits that waits for the arrival of news which repeated use coefficient has produced the minimum C/I value that still surpasses the C/I threshold value of storage in the controller storage 1725.For example, when the C/I threshold value equals 16 decibels (dB), select to reuse coefficient 7 and transmit message, and select the particular transmitter (for example TX2) in one of seven honeycomb repeated use groups to launch message to PMU1 to a PMU1105 (for example PMU1).Equally, select to reuse coefficient 5 and transmit message, and select another transmitter (for example TX8) in one of five honeycomb repeated use groups to launch message to PMU3 to another PMU1105 (for example PMU3).Determined which reuses coefficient and which transmitter 1115 prepares to receive the PMU1105 optimization message transport process of message for each, then, RFC1110 divides together having all output messages that equate the repeated use coefficient, so that utilize different repeated use grouping emissions in the different time cycles.Like this, transmitter 1115 groupings dynamically transmit message and are used for the message transmission, still optimize the C/I value simultaneously and transmit to guarantee proper messages.

Only for illustrative purposes, Figure 17 illustrates the repeated use database 1740 of a simplification, only comprises the C/I value and reuses the transmitter that coefficient is selected at each.Yet, be appreciated that those systems that is included in the confidential variation of particular transmission in the repeated use group are also comprised some other additional information.As an example, in fact, more complicated repeated use database can comprise that also which transmitter 1115 will be combined into the indication of a repeated use group with the selected transmitter 1115 of each repeated use coefficient entry in the database.In the repeated use database 1740 of Figure 17, for example, reaching and reuse coefficient with PMU1 is that three (3) relevant items can show that also selected repeated use group will comprise TX11, TX13, and TX14.Yet,, will be that the situation of fixing is come illustrative system 1100 according to the transmitter 1115 that comprises in each repeated use group below for the purpose of simplifying.

Next referring to Figure 18, this figure is the flow chart of explanation calculator 1730 work according to the present invention.In step 1805,1810, when message stores in emission database 1715 so that emission, but the PMU1105 that will receive this message is not when providing power measurement values yet, the message that keeps this specific PMU1105 is until till the time receives power measurement values from PMU1105 after a while.

In step 1805,1810, to launch and the PMU1105 that will receive this message when providing power measurement values as message, in step 1820, set a variable R _ U (expression ＂ repeated use coefficient ＂) and equal minimum repeated use coefficient by the repeated use information indication of storage in the controller storage 1725.Then, in step 1825,, utilize the particular transmitter grouping relevant to calculate the value of C/I with R_U for each transmitter relevant with the power measurement values that provides by receiving element PMU.Specifically, the C/I value by the signal strength signal intensity of the single-tone of all corresponding transmitter 1115 emissions in the system 1100 is sued for peace and calculated particular transmitter 1115.Corresponding transmitter be those will be on the channel identical with particular transmitter 1115 emission but transmitter in different repeated use groups.Then, with the signal strength signal intensity of the single-tone of particular transmitter 1115 emission divided by this and number.This process is provided by following formula:

(1) C/I _PMUn=intensity _{Transmitter m}/ ∑ (intensity _{All corresponding transmitter})

Suppose TX1 in the following Example, TX5, TX9, TX12, TX14, TX18, with TX12 be the corresponding transmitter on same channel, launched in the different repeated use groups and PMU1 from TX1, TX5, TX9, TX12, TX14, TX18 and TX12 receive single-tone.Provide these hypothesis and in conjunction with Figure 18 referring to Figure 12, when R_U=3, provide the C/I value of TX1 with respect to PMU1 by following formula:

(2) C/I _PMU1=intensity _TX1/ (intensity _TX5+ intensity _TX9+ intensity _TX12+ intensity _TX14+ intensity _TX18+ intensity _TX21).

Next example hypothesis TX3, TX13, TX18, with TX25 be transmitter corresponding in the different repeated use groups and PMU1 from TX3, TX13, TX18 and TX25 receive single-tone.Referring to Figure 13, when R_U=7 (Figure 13), provide the C/I value of TX13 in conjunction with Figure 18 with respect to PMU1 by following formula:

(3) C/I _PMU1=intensity _TX13/ (intensity _TX3+ intensity _TX18+ intensity _TX25).

In two examples, be appreciated that the single-tone of those emissions is not included in the denominator summation by the corresponding transmitter that PMU1105 receives in the above.In addition, when system 1100 comprises repeated use group than the greater number shown in Figure 12 and 13, the denominator summation will be considered additional corresponding transmitter, as long as PMU1105 receives the single-tone of emission thus.

Get back to Figure 18, in case as calculated all transmitters 1115 with respect to receiving element PMU1105 with respect to all C/I values of the R_U of current setting, in step 1830, in reusing database 1740, be the highest C/I value of the current repeated use coefficient storage for example represented and the ID of relative transmitter by R_U.As mentioned above, reuse database 1740 and can further indicate when the particular transmitter in each repeated use group can change all comprise which transmitter 1115 in each repeated use group in system 1100.

In step 1835, when not considering that yet all reuse coefficient in the C/I of receiving element PMU1105 value is calculated, R_U is increased to the next coefficient of reusing in step 1840.For example, in reusing database 1740 (Figure 17), R_U is increased to 5 from 3.Then, handle in step 1825 and continue, calculate the C/I value of all transmitters with respect to receiving element PMU1105 at next R_U value.

In step 1835, when in the C/I of receiving element PMU1105 value is calculated, having considered that all reuse coefficient, at step 1815 reference emission database 1715, so that determined whether to store any message that is transmitted into other PMU1105.If like this, program continues in step 1810.Like this, calculator 1730 is inserted the optimal C/I value of each receiving element PMU1105 and is reused database 1740 with the transmitter ID relevant with each repeated use coefficient.

Be appreciated that in simply communication system the repeated use pattern work always of a bit, in this case, can be the PMU relevant and keep message, show that up to the calculating of time after a while higher C/I value is arranged with inadequate low C/I value to fix.As an alternative, can use different repeated use coefficients, but in some cases, for example when when some transmitter can not use, not using by system.

Next referring to Fig. 9, described the flow chart of transmitter 1735 (Figure 17) work according to the present invention.In step 1905, when in the current time, when launching message when for example corresponding with the start frame (home frame) of PMU1105 frame arrives, setting variable R _ U in step 1910 is minimum repeated use coefficient, indicated as the repeated use information of storage in the controller storage 1725.Then, in step 1915, when the C/I of any receiving element PMU1105 value surpasses the C/I threshold value of storage in the controller storage 1725, the message of collecting those receiving elements PMU1105, and offer the transmitter that is used for launching in step 1920.Specifically, RFC1110 provides the instruction that the transmitter in the system 1,100 1115 is divided into the repeated use group according to the repeated use coefficient relevant with the currency of R_U.In addition, each message of utilizing the repeated use coefficient emission relevant with the currency of R_U is offered the transmitter 1115 of reusing regulation in the database 1740 (Figure 17), promptly pre-determined the transmitter 1115 that produces the highest C/I value into specific repeated use group.After this, in step 1925, can offer the message of transmitter 1115 or it has been labeled as from the deletion of emission database 1715 and launch.

In step 1915, C/I value in database 1740 does not surpass the C/I threshold value of the repeated use coefficient of R_U indication, and when step 1930 had considered that all reuse coefficients, transmitter 1735 was waited for time after a while, waits processing startup again again when step 1905 continues.In step 1930, when considering that not yet all reuse coefficient,, variable R-U is increased to next repeated use coefficient, and program continues in step 1915 in step 1935.

As at Fig. 9,14-18 is described, and PMU1105 calculates the signal strength signal intensity of the single-tone that receives and signal strength signal intensity turned back to the RFC1110 that calculates the C/I value.Then, RFC1110 can determine that at each message that will launch the transmitter of minimum number, the transmitter of minimum number are meant the transmitter quantity that the message that can assemble the repeated use group and still can guarantee to transmit can be decoded error-free by PMU1105 according to the C/I value.In addition, RFC1110 preferably can also change the quantity of transmitter in the repeated use group that transmits different messages.The result is owing to do not use any repeated use coefficient emission message higher than needed repeated use coefficient, can effectively utilize transmission resources.Therefore, often going out active message can not postponing and not have mistake or not resembling in the conventional message system gives information.

In addition, the C/I value can also be advantageously used in except that other purpose that transmitter 1115 is divided into the repeated use group.For example, can change data rate,, thereby further reduce the wait (backlog) and the delay of system so that report has the channel speed that the PMU1105 of high C/I value can be higher to receive message according to the C/I value.When the value of PMU1105 is enough high, even can cancel error correction to reduce message-length.

It will be understood by those skilled in the art that when RFC1110 has understood system layout configuration (layout) and transmitter characteristic RFC1110 does not need according to the fixing coefficient of reusing transmitter 1115 to be divided into grouping.And replace according to the position of PMU and the power measurement values of report, selecting and/or divide transmitter 1115 as required, RFC1110 calculates the C/I value by the power measurement values of report.As an example, can disclose by transmitter 1105 emissions of selecting with reference to the C/I value of calculating for receiving element PMU, other transmitter shutoff simultaneously can enough guarantee in special time transmission message, though in communication system 1100 structure of not repeated use group.As an alternative, can utilize 1115 groups in the transmitter of varying number to form the repeated use group.For example, a zone in system 1100 can form a repeated use group by three transmitters 1115, and in another zone, can form the repeated use group by seven transmitters 1115, and two repeated use groups can be launched simultaneously.

Even in the embodiment of the repeated use group that adopts fixed qty transmitter 1115, needn't in RFC1110, carry out pre-programmed to repeating coefficient of utilization.Can transmitter 1115 be divided into the repeated use group that defines by any rational repeated use coefficient by RFC1110 and replace.For example, remove and use outside the repeated use coefficient of setting 3,5,7,9,12 and 13 (as shown in figure 17), RFC1110 can calculate and reuse coefficient 1,2,3,4,5 ... Deng the C/I value, produce the C/I value that surpasses the C/I threshold value up to reusing one of coefficient.Like this, can be effectively and realize message emission apace and can not have influence on reliability.

Figure 10 is the circuit block diagram of spendable PMU1105 ' according to a further embodiment of the invention.Transceiver 1405 of PMU1105 ' use ', message memory 1415 ', frequency database 1430 ', measuring appliance 1435 ', single-tone database 1410 ', device memory 1425 ', the similar operation of carrying out to the PMU1105 of Figure 14 with a processor 1420 ' carry out of operation.In addition, PMU1105 ' comprises the calculator 1950 that can implement in firmware, is used for calculating the C/I value that each reuses coefficient from the signal strength signal intensity that receives single-tone.Then, reuse database 1955 these C/I values of storage.The device memory 1425 of PMU1105 ' preferably include C/I threshold value and be equivalent to the RFC1110 canned data of Figure 17.Yet, should be appreciated that in this embodiment of the present invention, the particular transmitter that comprises in each repeated use group should be fixed for each reuses coefficient.

According to this embodiment of the invention, calculator 1950 is reused the C/I value of coefficient calculations different transmitters 1115 at each, and to determine that with the same way as of describing referring to Figure 18 which transmitter 1115 produces the highest C/I value.Then the ID of this C/I value and this particular transmitter is stored in and reuses in the database 1955.Processor 1420 ' preferably to determine the minimum C/I value above the C/I threshold value, starts transceiver 1405 ' launch selected repeated use coefficient and transmitter ID to RFC1110 with reference to the C/I value of storage then.Like this, PMU1105 ' only need send a little information; Do not need to launch single-tone database 1410 ' whole contents.The result is only to need lower power and less time to launch required information to RFC1110.

In a word, aforesaid communication system comprises a rf control unit (RFC) that is used to control this system, is used to receive the portable messaging unit (PMU) of message and is used for transmitter to PMU emission message.According to the present invention, transmitter sends the single-tone that is received by PMU, calculates the signal strength signal intensity that receives single-tone by PMU subsequently, and signal strength signal intensity is transmitted into RFC with relevant transmitter ID.Then, the relative signal intensity of the single-tone that RFC receives at the different PMU of repeated use coefficient calculations relevant with transmitter being divided into the different repeated use groups that are used for message emission, i.e. C/I value.C/I value and threshold ratio, so that determine that at each PMU for preparing to receive message in several possible repeated use groups which will effectively utilize system resource and keep message reliability simultaneously.After this, according to reusing the message grouping of coefficient to launching, the RFC repeated use group that utilization need not be different respectively during the different time cycle is sent the message that will launch.

As an example, when a PMU sent first signal of expression first signal strength signal intensity, RFC can calculate a C/I value relevant with a PMU.Then, can be during the cycle very first time, utilize determine from a C/I value and be included in an emission group of planes with first quantity, promptly first reuse coefficient be feature the first repeated use group first select transmitter to launch message to a PMU.When the 2nd PMU sent the secondary signal of expression secondary signal intensity, RFC can calculate the two C/I value relevant with the 2nd PMU.After this, during second time cycle, utilize determine from the 2nd C/I value and be included in an emission group of planes with second quantity, promptly second reuse coefficient be feature the second repeated use group second select transmitter to launch message to a different PMU.Like this, but by dynamically change the repeated use group optimization system performance of transmitter according to the C/I value of calculating.

As an alternative, each PMU can calculate its C/I value at each repeated use group oneself, then being used for representing the most suitablely being used for sending the repeated use group of message and the signal of selected transmitter offers RFC.This embodiment needs less time and lower power to launch information from PMU to RFC.

Another advantage of calculating the C/I value is: can change data rate according to the C/I value, receive message so that report the channel speed that the PMU1105 of high C/I value can be higher, thereby quicken the message emission.In addition, can cancel error correction for PMU1105 with sufficiently high C/I value.

It will be understood by those skilled in the art that disclosed apparatus and method provide the various schemes of determining to transmit with best in quality the desirable transmitter of directed message in the communication system of setting up for the radio hookup operation.A kind of scheme that has provided is to improve resource utilization ratio and do not damage any signal or system performance, also can increase the weight of to handle the burden of resource necessarily.These invention structures and method are convenient to and are helped adopting in the radio selective message system, and system controller or message elements provide directed message to transmit, and power system capacity and efficient are improved.Therefore, promoting to satisfy aspect the radio communication long-term needs, for example system, the receiver etc. that need the radio hookup operation are obtained earlier in the present invention or the initialization unit position is then transmitted the desired level of directed message with the adaptive system traffic carrying capacity then.These information are exceedingly useful, by realizing that for example the message of more accurate orientation sends or makes the system of the transmission that gives information freer, provide bigger power system capacity.

Obviously, the technical staff in the disclosed invention field improves the present invention and supposes many embodiment in available multiple mode except that concrete statement and preferred form described above.For example process many of the present invention and the device of describing with the preferred form of FSK system worked finely in for example QAM system equally.Therefore, should cover all improvement of the present invention that fall in the spirit and scope of the invention by claims.

Claims (13)

1. One kind in the message system that comprises a plurality of transmitters with simulcast mode active configuration and formation, select to transmit the method for the transmitter of directed message, the method comprising the steps of:

   Detect respectively and comprise first signal of a basic parameter and one first identification signal and comprise described basic parameter and first and second transmitters of the secondary signal of one second identification signal with the simulcast mode emission, described first identification signal and described second identification signal differ first and second scheduled volumes with described basic parameter respectively

   Base station receiver receives an affirmation signal that is included in definite described first identification signal in a message elements position with respect to the indication of described second identification signal, described indication corresponding to from described first and described second transmitter select, be used for transmitting the preferred emission machine of directed message to described message elements.
2. 2. method according to claim 1, wherein launch described first signal and launch described secondary signal with the modulation signal that comprises the described benchmark single-tone and second transmitter identification single-tone with the modulation signal that comprises a benchmark single-tone and first transmitter identification single-tone.
3. 3. method according to claim 2, the step of wherein said confirmation of receipt signal further comprises reception and the corresponding indication of an identification single-tone the strongest, and this strongest identification single-tone is by determining described first with the described second transmitter identification form signal to noise ratio at described message elements.
4. 4. method according to claim 2, the step of wherein said confirmation of receipt signal further comprises receiving with a plurality of accepts to discern the corresponding indication of single-tone, these are a plurality of accept to discern single-tone by at described message elements described first with described second transmitter is discerned single-tone and a predetermined threshold is relatively more definite.
5. 5. method that is used for determining to transmit the desirable transmitter of message to a message elements, the method comprising the steps of:

   Reception comprises basic parameter, first identification signal, with the network signal of second identification signal, described first identification signal and described second identification signal differ respectively and first transmitter and the first and second corresponding scheduled volumes of second transmitter with described basic parameter respectively

   Described first identification signal and described second identification signal relatively, so that the indication corresponding with this ideal transmitter to be provided,

   Emission comprises the signal of described indication.
6. 6. method according to claim 5, the step of wherein said reception network signal comprise reception benchmark single-tone, first transmitter identification single-tone and second transmitter identification single-tone.
7. 7. method according to claim 6, the described step of wherein launching described signal further comprises emission and the corresponding indication of an identification single-tone the strongest, this strongest identification single-tone is determined with described second transmitter identification single-tone by more described first.
8. 8. method according to claim 6, the described step of wherein launching described signal comprises that further emission accepts to discern the corresponding indication of single-tone with a plurality of, and these are a plurality of accepts to discern single-tone by described first with described second transmitter is discerned single-tone and a predetermined threshold is relatively more definite.
9. 9. method according to claim 6, the described step of wherein launching described signal further comprises emission and can not accept to discern the corresponding indication of single-tone, can not accept to discern single-tone by described first with described second transmitter is discerned single-tone and a predetermined threshold is relatively more definite.
10. 10. message transmission system that comprises a plurality of transmitters with simulcast mode or non-simulcast mode active configuration and formation, this system comprises:

    First transmitter, be used for simulcast mode emission comprise basic parameter and with on frequency spectrum, be separated by first signal of first identification signal of first scheduled volume of described basic parameter,

    Second transmitter is used for comprising described basic parameter and differing the secondary signal of second identification signal of second scheduled volume with described basic parameter with simulcast mode emission,

    Base station receiver, be used to receive an affirmation signal that comprises the indication corresponding with described first identification signal of determining a message elements position and the comparative result of described second identification signal, described indication corresponding to from described first and described second transmitter select, be used for preferred emission machine to described message elements transmission directed message.
11. 11. a message elements that disposes and be configured to be identified for the desirable transmitter of message transmission, this selective message unit comprises:

    Receiver, be used for receiving and comprise basic parameter, the network signal of first identification signal and second identification signal, described first identification signal and described second identification signal differ respectively and first transmitter and the first and second corresponding scheduled volumes of second transmitter with described basic parameter respectively

    Be coupled to the comparator of described receiver, be used for relatively described first identification signal and described second identification signal, so that index signal to be provided,

    Be coupled to the transmitter of described comparator, be used to launch the signal that comprises the transmitter identification signal corresponding with described index signal.
12. 12. message elements according to claim 11, wherein said receiver further receive from the message of the transmitter corresponding with described transmitter identification signal with non-simulcast mode emission.
13. 13. message elements according to claim 11, wherein said receiver receive and comprise the benchmark single-tone, the network signal of first transmitter identification single-tone and second transmitter identification single-tone.

Images