CN1104024A - Method and circuit for retuning of a radio receiver - Google Patents
Method and circuit for retuning of a radio receiver Download PDFInfo
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- CN1104024A CN1104024A CN94190170.XA CN94190170A CN1104024A CN 1104024 A CN1104024 A CN 1104024A CN 94190170 A CN94190170 A CN 94190170A CN 1104024 A CN1104024 A CN 1104024A
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Abstract
A method and associated circuitry for retuning a tuning frequency of the tuning circuitry (422) of a radio receiver (400) to a frequency channel of a set of frequency channels. The tuning frequency of the tuning circuitry is retuned when the tuning circuitry (422) is initially tuned to receive a communication signal (412) transmitted by a transmitter of a less-than-most desired network of the transmitters. If a communication signal (412) transmitted by a transmitter of a most-desired network of transmitters is detected by the radio receiver (400) when the receiver (400) is retuned, then the receiver (400) clamps to the transmitter of the most-desired network of transmitters.
Description
The present invention relates to radio receiver, relate in particular to be used for initial once be tuned to the radio receiver of first channel of one group of channel the retune method of second channel of this group channel and the circuit of realizing this method.
A communication system can be used to transmission information between two or more positions, which comprises at least a transmitter and a receiver by a communication channel interconnection.A radio communications system is a kind of such communication system, and communication channel wherein comprises radio channel, and this radio channel is limited in the frequency range of communication spectrum.
The transmitter that forms a radio communications system part comprises change-over circuit, with the form that information translation is become to be suitable for transmit on a radio channel.Sort circuit comprises carries out the modulation circuit that is called " modulated process ", in this process, information to be sent is applied on the radio frequency electromagnetic wave of so-called " carrier signal ".So the signal that forms is commonly referred to " modulated signal ", is also referred to as " signal of communication ", and it is included in the information that communicates between the transmitter and receiver.
Well-known existing multiple modulation scheme is added on the carrier signal information to constitute signal of communication, and the combination of for example amplitude modulation, frequency modulation, phase modulation and these modulation schemes all can constitute signal of communication in order to information is applied on the carrier wave.
The advantage of radio communications system is to need not physical interconnections between transmitter and the receiver, in case information becomes a modulated signal through modulation, this modulation signal just can carry out long distance and transmit.
And a plurality of modulated signals can be simultaneously be sent out with the different frequency of electromagnetic frequency frequency spectrum.Be limited to and send signal of communication on the channel of some frequency range of electromagnetic spectrum and stipulate by administrative department (regulatory body).
A kind of two-way radio system is the radio communications system that is similar to above-mentioned communication system, but it both can realize information is sent to the three unities, also can send out information from this place.Each place of this two-way radio system had both comprised a transmitter, also comprised a receiver.Be positioned at transmitter on the three unities and receiver and constitute usually and be referred to as " unit of radio set ", or abbreviate one " transceiver " as.
A cellular communication system is a kind of two-way radio system, wherein can realize communication by a radio set of locating on any position in the geographic area that this cellular communication system covered.A cellular communication system is also referred to as " public land mobile network " (PLMN), or is called for short " net " hereinafter.
A cellular communications network is to constitute by being positioned at the radio set that spreads all over a plurality of fixedly scenes that are referred to as " base station " in this geographic area on many phases place across a certain distance.These base stations link to each other with traditional cable telephone network.The part of the geographic area that each base station is all the most adjacent with it is relevant.Such various piece is called " mesh ".Each mesh is to be limited by some corresponding base stations in a plurality of base stations, and so a plurality of mesh define the overlay area of this cellular communications network together.
Radio set is called " radio telephone " in cellular communications network, be positioned on any position in the overlay area of this cellular communications network, can be by the telex network of base station and traditional cable telephone network.The signal of communication that is produced by radio telephone is sent to the base station, passes to the required line position that has through traditional cable telephone network again, thereby realizes telephone communication.Telephone communication can be at first to utilize radio telephone to realize so that line position to be arranged also.
The legacy protocol of most of cellular communication net operations is determined phone is sent to which base station and receiving communication signal in this cellular communication system.Realization is known as " communication downlink " from the signal of communication transmission of base station to a radiophone; Realize that by radio telephone the signal of communication transmission is called " communication uplink ".
The channel that the frequency range of distributing for cellular communication is split to form is subdivided into control channel and traffic channel again.Control channel in traditional cellular communication system is decided to be different frequencies with traffic channel.In the system that adopts time-division multiplexing (TDM), control also can be set in identical channel with traffic channel, but is confirmed as different time slots within it.
Control channel is called the signal of communication of " control signal " in order to transmission this paper by base station assigns.Wireless telephone operations was with scan control channel (both scanned during the radio telephone power connection and also periodically scanned in its operating period).The power level of the signal that transmits on control channel determines, and responds this measured value, and radio telephone attempts determining the information content of the control signal that produces on a control channel.In this stage of signal transmission, if the information content of the control signal that transmits on selected control channel is confirmable, and the information content that transmits through this control channel meets predetermined criteria, and then communication downlink can realize.Wireless telephonic receiver circuit keeps being tuned on the selected control channel.Original radio telephone just was tuned within the selected control channel, and the information of " monitorings " transmission on it.Sometimes wireless telephonic this operation is called wireless telephonic " seeking logical (camping) ", and, in case realized base station and wireless telephonic communication downlink, often this radio telephone is called " seek and lead to a base station (or mesh scene) ".
In case realized the communication downlink between radio telephone and base station, wireless telephonic receiver circuit can be in power saving (Powered-down) state, just in required dust cycle again by energized periodically.This receiver circuit by the cycle of energized once more in, the information content of the control signal that transmits on selected control channel is monitored (promptly this radio telephone is sought and led to this control channel).(should be noted that control signal also can be transmitted through traffic channel sometimes.Yet, this control signal be after the communication link between radio telephone and base station has been realized and transmitted especially).
Because of receiver circuit only is an energized periodically, so in case when having realized communication downlink with the base station energy consumption of sort circuit just be reduced to minimum.
When a radio telephone was called out, the information content of control signal was instructed some definite traffic channels with this radio telephone, thus the beginning Speech Communication.
Can on various regions, dispose different cellular communications networks.When having disposed different cellular communications networks on various regions, and when the user of first cellular communication system was in the region that is covered by second cellular communications network, the user of this first cellular communications network also allowed to use second cellular communications network sometimes.Usually, different cellular communications networks are configured on the adjacent region.When the user was between the network that is roughly two adjacent positioned, this user can use a more than communication network (for the user, the region that this cellular communications network by adjacent positioned covers may occur some is overlapping).
The user often be referred to as " inner Public Land Mobile Network " (HPLMN) or claim the operator of " in-house network " cellular communications network (home-network) to enter a record keeping process.And when the user was in the region that is covered by other cellular communications network, the operator of this cellular communications network just may enter and those permission users use between the operator of other such communication network and reach an agreement.For the user of in-house network, these other cellular communications network is called as visit Public Land Mobile Network (VPLMN) or claims " visit net " (Visitor-network).
, require the expense of user's payment different, widely different sometimes usually for different cellular communications networks.When the user of in-house network uses the visit net, for the expense of the required payment of this use generally will exceed the expense of being paid when user class seemingly uses in-house network.In view of the above, when being in earlier, the user uses the position that the visit net controlled but when moving to the region that is covered by in-house network, this user's concern finishes the use of visit net as soon as possible and brings into use in-house network as soon as possible.
In view of this, if having a kind of device to detect as soon as possible originally to be in the user in the visit net may visit the in-house network time, this will be useful.
Under some other situation, the user can be in the region that cellular communications network covered that does not belong to in-house network, but does not allow the user of in-house network to use the agreement of its communication system between the operator of in-house network and the corresponding communication system.If these communication systems are compatible each other, then the user of in-house network often can be for urgent purpose (what for example yard 1-1-2 or the U.S. were promptly exhaled in Europe promptly exhales a yard 9-1-1) inserts the corresponding communication system, but then can not use the corresponding communication net in addition.When originally user one is in corresponding communication network and when moving into also by region that in-house network covered subsequently, this user is then to the sexy interest of the access that detects in-house network as early as possible.And when originally the user was in the corresponding communication net but move into allows normal visit net that uses the visit net subsequently, the user may be equally be interested in to the detection as early as possible of the access that allows this normal use visit net.
In view of this, originally be in the time of going aboard for visit the user-accessible in-house network in the network if there is a kind of device to detect as soon as possible, this also is useful.If this also is useful a kind of device to detect as soon as possible originally to be in the time that the user capture that only allows the urgent visit net that uses allows normal use in-house network.
The user wishes the Cellular Networks used most, if possible, in-house network especially is called " wish most use net " hereinafter, and other net is especially gone aboard for visit net and hereinafter is called " non-wish most use net ".For example, originally the user is in the visit net that only allows urgency communication, but may be repositioned at thereafter in the visit net of a permission proper communication.In this example, the visit net of permission proper communication comprises wishes the net of use most, and only allows the visit net of urgency communication to comprise non-net of wishing use most.
Many radio telephones are made by battery power and come work, and only work a limited period owing to the finite energy reserves capacity of battery supply.By the performed search of the radio telephone of control channel for the control signal finding to launch through control channel by the transmitter of any particular cellular communication net, be not only to detect and be launched the appearance of control signal on control channel, and determine any information content detected, control signal, all need radio telephone is powered.(, need to determine the information content of detected signal for determining to send the base station of signal.）
Can insert the device of the time of the net of wishing use most owing to the finite energy memory capacity of the battery supply of powering for many radio telephones is feasible in order to the detection user need not require to produce remarkable energy input for doing this kind detection.
For this reason, need a kind of device now and can allow to detect the radio telephone of phone initial alignment in not belonging to a region district that Cellular Networks covered that wishes net most originally as early as possible, become to re-position at and wish to use time in the region that net covers most, and this device only needs minimum electric energy to carry out this detection by this.
In view of the above, the present invention is provided for overcoming the circumscribed method and the circuit thereof of prior art valuably.
According to the present invention, a kind of method and relevant circuit of tuned frequency of the radio receiver tuning circuit that retunes are disclosed, in order to the signal of communication of the transmission on the channel that receives one group of channel in the frequency range that is limited by an emission in a plurality of transmitters of the network of wishing most to use.This wireless receiver is initially by tuning, in order to receive the signal that is sent by a transmitter in non-a plurality of transmitters of wishing to use network most.The tuning circuit of this radio receiver is tuned to each frequency of one group of channel determining on this frequency range, the power level of transmission communication signal is all measured on each channel of this group channel.Transmission communication signal is measured as and belongs to selected first grouping as channel of a Minimum Power Level those channels in addition on the channel.Whether to transmission communication signal on the channel of channel first grouping is judging by a transmitter emission in a plurality of transmitters of wishing the use net most.If judging this signal of communication is to be launched by a transmitter in a plurality of transmitters of wishing network most, then the frequency tuning of this radio receiver tuning circuit is chosen as the signal of communication channel that transmission is launched by a transmitter in a plurality of transmitters of wishing net most.
When reading this specification with reference to the following drawings, will be better understood the present invention, wherein:
Fig. 1 illustrates the part schematic diagram and the part block diagram of the cellular communications network of the method that adopts most preferred embodiment of the present invention and circuit;
Fig. 2-1 is depicted as the part of the frequency range of cellular communication distribution;
Fig. 2-the 2nd illustrates that a channel that defines time slot thereon when adopting time-division multiplexing (TDM) schematically shows;
Fig. 3 is the logic block-diagram of wireless receiver that comprises the circuit of most preferred embodiment of the present invention;
Fig. 4-1 be illustrated in the power level of the control signal that most preferred embodiment of the present invention operating period measures and the noise floors of dynamically setting up (floor) that draws thus between graph of a relation;
Fig. 4-2 is illustrated in the graph of a relation between the noise floors of the power level of the control signal that operating period of most preferred embodiment of the present invention measures and absolute value;
Fig. 5 illustrate previous measurement signal power level and remeasure graph of a relation between the signal power level that obtains; And the comparison diagram that utilizes these power levels in the operating period of most preferred embodiment of the present invention;
Fig. 6 illustrates the algorithm logic flow chart of the method that embodies most preferred embodiment of the present invention;
Fig. 7 illustrates the logical flow chart of the method step of most preferred embodiment of the present invention;
Fig. 8 illustrates the block diagram of the radio set that includes most preferred embodiment circuit of the present invention.
At first with reference to figure 1, it is with cellular communications networks of label 100 overall expressions.As mentioned above, a cellular communications networks is by several phase base stations across a certain distance, position decided at the higher level but not officially announced constitute in whole region.These base stations are represented to put 104,108,112,116,120,122,126 and 130 in Fig. 1.Though only show 8 base stations in the drawings, should be appreciated that certainly typical cellular communications networks will comprise the base station of suitable big figure usually.
When a plurality of radio telephones were positioned in each nearby spheres of these base stations, each of base station 104-130 all contained circuit, and each base station sends to a plurality of radio telephones with signal of communication, and received the signal of communication by these radio telephones sent.
Each of base station 104-130 all is coupled to traditional cable telephone network.This connection is represented with the line 134 that base station 130 is connected with wired network 138.Being connected of each of cable network 138 and other base station 104-126, can illustrate in the drawings similarly.
The position of each base station of the base station 104-130 of formation cellular communications network 100 is all carefully selected, guaranteeing that having at least a base station to be positioned receives the signal of communication that radio telephone was sent of any location positioning in the whole region that is covered by system 100, and determine the cellular coverage of this system thus.In other words, at least one of base station 104-130 must be within the wireless telephonic transmission range of any position that is positioned in this region.(because thereby the maximum magnitude of its transmission of maximum intensity of the signal that is sent by the base station is usually than big by signal maximum intensity and corresponding maximum transmission scope that radio telephone signaled, thereby this point is the principal element that must consider when considering the location, base station of cellular communications network.）
Because the location of this base station phase characteristic across a certain distance, the various piece of this whole region that base station 104-130 is put all each base station with these base stations is relevant.Each these region parts that are adjacent to base station 104-130 are defined as " mesh ", among the figure with zone 144,148,152,156,160,162,166 and 170 expressions.Mesh 144-170 has formed this territory district jointly, and has determined the zone that covered by cellular communication system 100.The radio telephone of set within any one border of the mesh 144-170 of system 100 can carry out the transmission and the reception of modulation signal with regard at least one of base station 104-130.
As previously mentioned, the user of cellular communications network will enter the record keeping process with the operator who for this user is the cellular communications network of " in-house network " usually.For the following purpose of description of being convenient to, cellular communications network 100 is called in-house network in the back, or more generally is called " wish most use net ".(but it should be noted that though this in-house network normally wishes most net, a visit network constitutes and wishes net most sometimes.）
Equally as previously mentioned, comprise the wireless telephonic detection that utilizes wireless telephonic control signal to carry out so as to the general purpose discipline that begins to communicate by letter between radio telephone and cellular communications network base station, this control signal is sent by each base station on each control channel of determining in the communication network.Each base station of this cellular communications network all transmits control signal on the expectant control channel, to show existing of this base station, in case and this radio telephone is confirmed then to realize and this wireless telephonic downlink communication link in the information content of selecting the control signal that is sent on the control channel.(same, when adopting time-division multiplexing (TDM), control and traffic channel can be decided with similar frequency, but are in different time-gap.）
In case realized the communication downlink between radio telephone and the base station, this wireless telephonic receiver circuit just can be in power down mode, in the periodic interval that produces, it will be reclosed power supply to determine the information content through the control signal of control channel transmission in required dust cycle.
When this radio telephone is called out, the information content of control signal (being data) instruct this radio telephone be tuned to be defined in the specific traffic channel of this cellular communication system, thereby realize the two-way communication of this radio telephone and this base station.Otherwise this wireless telephonic receiver circuit then is in power down mode according to required dust cycle.
Equally as previously mentioned, the different cellular communications networks of configuration often on various adjacent regions.For the user, occur then by the region district that network covered of adjacent positioned that certain is overlapping.In Fig. 1, also show a part with one second cellular communications network of label 200 representatives.Net 200 be configured with net 100 be adjacent.Be similar to the regional 144-170 of the mesh of expression net 100, the mesh of net 200 is represented in the zone 214 and 218 that is represented by dotted lines.Be the convenience that describes below, net 200 will be called as " visit net ", or more common being called " non-wish most use net ".
Equally as previously mentioned, when the user was in the zone that is covered by this visit net, the user of an in-house network also was allowed to use the visit net often.Or under other situation, when the user was in the region that is covered by the visit net, it was allowed to use the visit net for urgent purpose.Yet in the previous case, the user uses the required paying of visit network to be greater than and uses the required paying of in-house network.And in the later case, except for urgent purpose, the user is not allowed to use the visit net.
In view of the above, when the user initially is arranged in away from wishing most to use net 100 and be positioned at when wishing most region that net 200 covered by as shown in Figure 1 non-as shown in Figure 1, and, this user non-ly wishes most net when having adopted this, but move into subsequently when wishing to net the region that is covered most by this, this user with regard to interesting finish as early as possible to use thisly non-ly most wish net and bring into use as soon as possible and wish most net.
Beyond radio telephone that the user uses is positioned in the area of coverage of wishing net 100 most but belong to when being positioned within the non-area of coverage of wishing net 200 most, the signal of launching by non-base station of wishing net most be will cause detecting by the search of the control channel of wireless telephonic circuit institute conducting, and this radio telephone and non-communicating by letter of wishing most to net begun according to the mode of pointing out above.
Wireless telephonic relocate to be positioned at this radio telephone by this wish most to net in the region of covering.
Shadow region 222 representatives are by the area of coverage of wishing net 100 most with by non-area of coverage overlapping areas of wishing net 200 most.The user who wishes most net 100 can initially be positioned at a radio telephone just in this non-area of coverage of wishing net 200 most (removing overlay region 222).Though the user can utilize its radio telephone to communicate by letter with net 200 according to the mode of pointing out above, this user can be both by wishing most that net 100 also most wishes that by non-(being shadow region 222) reorientates its radio telephone in the zone that net 200 covers herein.A radio telephone initially is positioned only allow to utilize in the non-region of wishing net most as the user but moves into subsequently when allowing to use in the region of wishing net most, because the interesting use of user is wished net most and is not used the non-net of wishing most, so preferably have a kind of the device to allow this radio telephone to make the access detection that this wishes network most as early as possible, but this device must be not need significant energy input for carrying out this detection.
Fig. 2-1 illustrates a frequency range representing to distribute to cellular communication with label 300.Frequency range 300 is divided into several channels, and some is designated as control channel D1, D2 ... Dn and traffic channel V1, V2 ... Vn.Radio telephone is once connection, total rules of the initial operation of determining according to the communication that is connected with the base station, and this radio telephone is defined in each control channel on the frequency range 300 with search.
Fig. 2-2 illustrated with label 306 and represent single channel and the schematic diagram of the time slot that limits on a period.When adopting time-division multiplexing (TDM), channel 306 expressions are limited to a plurality of time slots on the single channel.A plurality of time slots that channel 306 limits on it.Adopt the expression of Fig. 2-1, time slot V1 to Vn is defined as traffic channel, and other time slot D1-Dn is defined as control channel.
When the method for most preferred embodiment of the present invention and circuit running to search with traditional or during with the control channel of the system definition of time division multiplexing, Fig. 2-1 adopts identical expression with 2-2.
The tuning circuit of this radio receiver part with this radio telephone be tuned to each control channel D1, D2 ... Dn is to detect existing of on any one control channel control signals transmitted.The power level of any detected control signal on any control channel is all measured, and trial realizes and a communication link of the base station of wishing network most of the tested signal of transmission maximal power level.(by confirming the information content of this detected signal, the base station of making this control signal of transmission is the judgement of wishing network most.）
If wish most radio telephone and one can not realize its communication link between the base station of network, then utilize one non-ly to wish most that a base station of network realizes (if possible) communication link.
With reference to the logic diagram of figure 3, this illustrates the circuit by the most preferred embodiment of the present invention that is made of block diagram of label 400 expressions in frame of broken lines.As shown in Figure 3, circuit 400 has constituted the part with a wireless receiver of label 406 representatives.Wireless receiving machine circuit 406 can constitute the receiver circuit that is operated in the cellular communication system such as wireless telephonic radio receiving-transmitting unit.
Wireless receiver can be used to search the expectant control channel, and the control channel D1-Dn shown in Fig. 2-1 or Fig. 2-2 for example is to detect existing of the control signal that transmits on each of control channel.
The antenna 418 of receiver 406 detects by the control signal 412 of being launched such as transmitter 416.Produce on the signal online 420 that expression is detected by antenna 418, and be sent to tuning down conversion circuit 422 able to programme.The signal that line 436 is delivered in circuit 422 response with receiver be tuned to the channel determined, be called initial control channel herein.
Produce the signal of some specific channel inner control signals of expression on the circuit 422 online 448, these specific channels are reached by circuit 422 tuned receivers 406, and the signal that produces on online 448 is sent to demodulator 458 and signal strength measurement circuit 468.Produce the signal of demodulation on the demodulator 458 online 464, be sent to decoder 470.Decode and produce signal on 470 online 476 and deliver to processor device 482.Decoder is also operated so that produce decoded signal on online 486, and it is sent to a converter 488, for example a loud speaker.
Produce on the signal strength measurement circuit 468 online 492 and be coupled to the signal of processing unit 482 inputs, thereby the signal power level that will be referred to produce on the line 448 comes information to deliver to processing unit 482.Because what produce signal reflection on online 448 is the signal that is detected by antenna 418, the signal level that produces on then online 492 also is similar to the signal power level that expression is detected by antenna 418.
Memory cell 496 is illustrated again in the figure that is connected to processing unit 482 by line 498.
In the operation, if radio receiver can't realize and a communication linkage of wishing the base station of network most, then may and the situation of user expectation under, realize and the linking of a non-base station of wishing network most.Yet even realized wishing linking of network most with non-, radio receiver 406 also will be operated immediately searching each channel of one group of predetermined control channel, to attempt detecting existing of the control signal of being launched by the base station of wishing network most.
Produce on the processing unit 482 online 436 signal with in order with circuit 422 be tuned to each of control channel.When receiver 406 be tuned to during each of control channel, the signal indication that then produces the detected signal on each control channel on the circuit 422 online 448.Produce the signal of its power level of indication on the signal amplitude that produces on signal strength measurement circuit 468 slotted lines 448 and online 492.The value that processing unit 482 will so be measured is stored in the memory cell 496.Processing unit 482 operations are so that the channel associated of measured power level and this signal of transmission.
In case record the power level of the data-signal that sends on each control channel, 482 operations of processing unit determine whether to do a trial, to set up and the down link that sends the base station of a control signal on one of its control channel.
In order to do such determining, processor 482 forms first control channel grouping of this control channel group.The control signal power level that response sends thereon selects to constitute the control channel of this first grouping.
In most preferred embodiment, having only the data-signal on the control channel is that the power level that has surpasses: 1) " noise floors " level of dynamically determining, or 2) an absolute value noise floors, such control channel are just chosen to constitute the channel of control channel first grouping.
Dynamically the noise floors of establishing is to be compared by each the power level to control signal by signal strength measurement circuit 468 to establish.This noise floors is to determine with the power level of a determined value that is higher than lowest amplitude measured power level.
Also show line 499 among the figure, it provides an external signal has been input to processing unit 482 with receiver 406 operations that at any time reset.For example, sort signal can produce by starting a starting switch that links to each other with line 499.
The noise floors of dynamically determining has been shown in Fig. 4-1, has represented by line 550 among the figure.Each arrow 560 is all represented the signal that the receiver 406 by Fig. 3 is detected through a control channel.The height of each of arrow 560 is an indication of power level.Line 550 is illustrated on definite power level the noise floors of dynamically establishing, it by bracket 570 indications and on the signal power of lowest power level, sort signal is represented by the arrow 560 of the rightmost side that is in figure.Selected first grouping that constitutes control channel of channel greater than the data-signal of this noise low value power level is arranged on it.As the value of dynamic establishment, the noise low value depends on the measured power level value, and so the numerical value of this noise floors of establishing changes according to the power level of the control signal of actual measurement.
Absolute value noise floors is the power level of a selected amplitude.Fig. 4-2 shows absolute value noise floors, represents with line 605 among the figure.The signal that each arrow 610 indication is detected on a control channel.By the signal of arrow 610 expression corresponding among Fig. 4-1 by the signal of arrow 560 expressions, and with the height indicated horsepower level of each arrow.Also selected first grouping that constitutes control channel of those channels greater than the control signal of the power level of these noise floors is arranged on it.
Therefore, in most preferred embodiment, if the control signal that transmits on control channel is greater than the noise floors of dynamically establishing or greater than absolute value noise floors, first grouping of the selected formation control channel of these control channels.
The base station communication link that transmits a control signal to receiver 406 is attempted realizing utilizing in the base station that only utilizes the control channel that divides into groups at control channel first to upload feed signals.
Therefore, have only that to determine on one of channel the signal of transmission when decoder 470 be the realization that just can occur communication link when being launched by a base station of wishing network most.(in other words, be when wishing that network is launched most, produce signal on the decoder 470 online 476 when indicate this control signal through the information content of the control signal of the transmission of selected control channel.) be sent to an input of processing unit 482 by the signal that produces on the decoder 470 online 476, indicate the information content of this control signal to be correctly decoded, and therefore indicate this wireless receiver to be retuned to realize and to launch the communication link of the base station of wishing network most of this control signal.
If do not detect by the base station produced and the control signal that enough power levels are arranged of wishing network most, and this radio receiver do not attempted realizing by retuning and wishes the communication link of the base station of network most, and then this radio receiver will suspend interval when definite before the communication link of attempting once more establishing with the base station of wishing network most.
In most preferred embodiment, wireless receiver suspend the time interval provide by following formula:
TP=(x+(y
*The first grouping number of channels))
*Z%
In the formula, TP is period (is unit with the second)
X was used for measuring through any required period of control channel data signals transmitted power level;
In case y be make a try establish decision with the communication link of one of base station after, the 422 tuned receiver required periods of 406 to one specific control channels of circuit; With
Z is the desirable dust cycle of wireless receiver.
After through the time period of being determined by following formula, circuit 422 is operated once more with tuning this receiver each to the control channel of this frequency band.Each power level of the signal that transmits on each of each control channel is measured (being remeasurement) once more by circuit 468, and will indicate the signal warp 492 of this measured power level to deliver to processing unit 482.Treatment circuit 482 is operated, so that the power level of resurveying that goes up control signals transmitted through each of each control channel is made comparisons, and the last time power level of measurement of transmission signals is compared on the power level that will so resurvey and the channel that divides into groups at channel first.
(it should be noted that and also can adopt other to select the method for second grouping.For example, replace above-mentioned step 1 and 2 with following step, promptly, such channel, the noise floors that power level of data-signal before promptly had been lower than dynamic establishment on it also is lower than absolute value noise floors, and the value of resurveying is higher than the one of any of these two noise floors, can be used to constitute second grouping of control channel.）
More particularly, processing unit 482 is operated to determine that signal on which channel before had been be lower than these two noise floors one of any, promptly or be lower than the noise floors of dynamic establishment or be lower than absolute value noise floors, and when resurveying, its value is again to be higher than this two noise floors respectively, or obviously increases on amplitude.
Fig. 5 shows the operation of processing unit 482, to determine selecting which channel to form the grouping of second channel.And then attempt only realizing communication link with the transmitter that on the control channel of this second grouping, sends signal.
The noise floors that horizontal line 650 expressions are dynamically established, and horizontal line 655 expression absolute value noise floors.(relativeness that should be noted that them also may be opposite, and promptly absolute value noise floors may be the value greater than the noise floors of dynamically determining.) signal that transmits at the channel with the initial measurement power level that is lower than noise floors 650 and 655 of arrow 606 expressions.(notice that noise floors 650 and 655 corresponds respectively to the noise floors 550 and 605 of Fig. 4-1 and 4-2 herein.) channel of transmission signals 606 do not constitute the part of channel first grouping, because according to initial measurement, the power level of signal 606 is lower than the noise floors.
; suspend at this receiver and to have ended by above-mentioned formula interval when determined; and after the power level of each transmission signals on control channel is remeasured, by the dotted arrow 644 represented signals that on same control channel, produced be higher than these two noise floors one of at least.Select this control signal to realize sending the communication linkage of a base station of a control signal with trial with selected control channel in the grouping of second control channel with the control channel and this radio reception machine operation that constitute channel second grouping.Second grouping with also selected formation control channel of control channel (not considering whether its value of resurveying surpasses a noise floors) of the control signal of a base station transmission that significantly increases by power level.This signal is represented with dotted arrow 670 in Fig. 5.
If the signal power level that transmits on each of each control channel is not detected the signal of enough power levels that a base station by local network sends after remeasuring, interval when then 406 of this wireless receivers suspend one once more, and the circuit of this receiver is in power down mode once more.In illustrated embodiments, this preset time phase is corresponding to phase set time, i.e. interval one of the higher value of aforesaid equation the time.
If after the signal power level that transmits on each of each control channel is remeasured, there is not to realize communication downlink with the network of wishing most, interval when then 406 of this wireless receivers suspend one once more, and the circuit of this wireless receiver is in power down mode once more.In illustrated embodiments, this preset time phase is corresponding to phase set time, i.e. interval one of the higher value of aforesaid equation the time.
In other words, therein, the period that the several portions of receiver is in power down mode is the higher value of the fixed amount (for example 15 seconds) of time, and should the time interval provide by following formula:
TP=(x+(y
*The number of channels of first grouping))
*Z%
In the formula: TP is period (is unit with the second)
X is used for measuring the required period of data signals transmitted power level on any control channel;
In case y be make a try establish decision with one of the base station communication link after, the 422 tuned receiver required periods of 406 to one specific control channels of circuit; With
Z is the desirable dust cycle of radio receiver.
Again referring to Fig. 1, in the time of beyond the user of in-house network 100 is positioned at radio telephone the scope that the network 100 of wishing most covered, if each signal launched by the base station of the net 100 of wishing is most detected by this wireless telephonic receiver circuit, then these signals are lower than the noise floors.Yet, if the user radio telephone is positioned to be wished most in the region that network 200 covered by non-, can non-ly wish most that a base station of network realizes a communication link by this.
Be provided with a radio telephone that is similar to radio receiver 406 circuit and will in transmission interval, measure the power level of the signal of transmission once more distributing on the control channel of cellular communication bands.If one of any institute's control signals transmitted at control channel has the power level that exceeds noise floors as defined above, and launched by the base station of this network of wishing most, then this radio receiver will be tuned to this control channel that sends this control signal on it.
The control channel that transmits this control signal is selected to constitute the control channel of channel second grouping, and, if the signal that the control channel that divides into groups at channel second transmits is launched by this base station of wishing network most, then promptly realize communication link with this base station.If judge to show, wish that the base station of network is not sent in the control signal that produces on the control channel of second channel grouping most, then this radio receiver will be in scheduled time slot of power saving its energy consumption is reduced to minimum.
This selection control channel is repeated incessantly with the process that forms this control channel second grouping, to determine whether launched by a base station of wishing most in a control channel control signals transmitted.After phase seclected time (for example 10 minutes), if do not realize and the communication link of wishing a base station of network most, this system is then by initial again, to determine first grouping of control channel once more.
With reference to the logical flow chart of figure 6, this illustrates and the corresponding a kind of algorithm of the method for most preferred embodiment of the present invention, with label 680 expressions.This algorithm can be performed by the processing unit 482 of receiver among Fig. 3 406.For illustrative purposes, the receiver of having supposed to adopt this algorithm operating before carrying out this algorithm (and wherein) by tuning to receive by the non-signal that the base station produced of wishing network most.
At first, measure the signal power level that on each of control channel, transmits in step 684.Form first of control channel in step 688 and divide into groups, and attempt setting up communication link with a base station of wishing network most that on one of these control channels, transmits control signal in step 692.
In determination step 696, judge for whether setting up communication link with a base station of wishing network most.If can finish this downlink, flow process enters step 700, and with the frequency tuning of the receiver tuning circuit frequency to selected control channel.Otherwise flow process enters step 704, preserves the measured power level, and in step 708 part of receiver is in period of power saving.(should be understood that, can in this period, be responded the execution of other algorithm and be reclosed power supply by this part of the receiver of power saving, for example, this receiver initially is tuned to the non-purpose that transmits of wishing a base station of network most in order to monitor by this receiver, can reclose power supply to this receiver.）
After this period, in step 708, these parts of receiver are by energized once more again, and measure the power level of control signals transmitted on control channel once more.In step 712, form second grouping of control channel, and in step 716, attempt and set up down link in a base station of wishing network most of transmission of control signals on this at this channel.
At determination step 720, for whether realizing the communication downlink judge with a base station of wishing network most.If "Yes", flow process enters step 724, and with the frequency of receiver tuning circuit frequency tuning to selected control channel.Otherwise, refresh the power level of having stored thereby in step 728, preserve tested power level, and in step 732 period of this part power saving with receiver.
After this period, in step 736 judge, whether the expansion time that check is measured (step 684) beginning from the first time of control signal power level is exceeded.If "Yes" to step 684, and repeats this program.Otherwise to step 710, the power level of the control signal of resurveying.
Come the logical flow chart with reference to figure 7 below, this figure has listed the method step of the method for most preferred embodiment of the present invention with label 750.When wireless receiver initial tuning when receiving signal of communication that the non-transmitter of wishing network most of by transmitter one launched, the tuning circuit of 750 pairs of radio receivers of method carries out frequency tuning again, wishes the signal of communication that a transmitter of network is launched most to receive by transmitter on a channel of a channel grouping.
At first, shown in step 756, the tuning circuit of radio receiver is tuned to each channel in the channel-group of determining on frequency range.
In step 762, measure the power level of each signal of communication of launching of the channel in this channel-group.
In step 768, those channels of selecting transmission measured power level to exceed the signal of communication of a Minimum Power Level divide into groups to form first of channel.
Whether in step 774, making about transmission communication signal on a channel of first channel grouping is the judgement that transmitter is launched wishing network most of transmitter.If this signal of communication is launched by the transmitter of the transmitter network of wishing most, then the frequency tuning of radio receiver tuning circuit is chosen that channel of wishing the transmitter emission signal of communication of network on it by transmitter most.
With reference to figure 8, this illustrates for example wireless telephonic radio set 800 at last.This transceiver 800 comprises the circuit 806 of the most preferred embodiment of the present invention that is made of element in the frame of broken lines.Circuit 806 is corresponding with the circuit 400 of Fig. 3.The receiver section of radio set 800 is similar to the radio receiver 406 in Fig. 3 block diagram, thereby its operation need not to describe in detail.The receiver section of radio set 800 comprises antenna 818, and line 820 is attached thereto, with antenna 818 with able to programme tuning/down conversion circuit 822 links to each other.The input signal that the operation of circuit 822 is added on the line 836 is controlled.Produce the signal of delivering on demodulator circuit 858 and the measured circuit 868 of signal strength signal intensity on the circuit 822 online 848.Demodulator produces restituted signal on circuit 858 lines 864, deliver to decoder 870.
Produce the signal of delivering to 882 1 inputs of processing unit on the decoder 870 online 876.Produce on the decoder 870 also online 886 and deliver to converter, for example decoded signal of a loud speaker.Warp 892 of signal strength measurement circuit 868 generations is delivered to the signal on the processing unit 882.Memory cell 896 also is coupled to processing unit 882, thereby imports to the outside that provides of processing unit 882 through line 898 and line 899.
Radio set 800 also comprises a radiating portion, and this part generally includes a converter (for example microphone) 908, encoder 912, modulator 916 and a tuning up conversion circuit 922 able to programme.The input signal that the operation of circuit 922 is provided by line 928 is controlled.Circuit 922 produces the signal that warp 934 is delivered to antenna 818, thereby realizes the emission of information signal.
Though the present invention is the description of making in conjunction with each most preferred embodiment of the present invention shown in the drawings, but be understood that, also can use similar embodiment, and can do some correction and add to carry out identical functions of the present invention and do not deviate from its essence described embodiment.Thereby the present invention should not be limited to arbitrary single embodiment, and should lay down a definition according to the scope of appending claims.
Claims (10)
1, a kind of circuit of tuned frequency of tuning circuit of the radio receiver that is used to retune, when this at radio receiver by initial tuning the reception when wishing most signal of communication that a transmitter of network launches by transmitter non-, the tuned frequency of the tuning circuit of this radio receiver retunes to receive transmission communication signal on the channel in one group of channel being wished most to determine on the frequency band that a transmitter of network launched by transmitter, it is characterized in that said circuit comprises:
Be used to measure the device of institute's transmission communication signal power level on each channel of each channel-group;
Be used to select the measured power level of transmission communication signal on it to be higher than those channels of a Minimum Power Level to constitute first device that divides into groups of channel;
Whether the signal of communication that is used to judge a channel transmission of channel first grouping is the device that transmitter is launched that transmitter is wished network most; And
When judging that by said decision maker this signal of communication is when wishing most that by transmitter the transmitter of network is launched, be used for the frequency selecting tuning of the tuning circuit of the wireless receiver device to the channel of the transmitter emission signal of communication of wishing network by this transmitter most.
2, circuit as claimed in claim 1 is characterized in that, the Minimum Power Level of being selected to constitute selected channel grouping by said choice device that channel utilized is and a relevant level of measured power level of being measured by said measurement mechanism.
3, circuit as claimed in claim 2 is characterized in that, the Minimum Power Level of said choice device utilization is and the corresponding value of a predetermined level greater than institute's power scale level of the measured power level of a minimum value.
4, circuit as claimed in claim 1 is characterized in that, the choice device that said selection constitutes selected channel grouping utilizes Minimum Power Level to select those to be higher than a channel predetermined, the absolute value Minimum Power Level.
5, circuit as claimed in claim 1 is characterized in that, wishes that transmitter non-network measured the device of a period of operation delay of the device of power level to the major general after initially tuning most.
6, circuit as claimed in claim 5 is characterized in that, said time-delay mechanism prolongs this period according to measurement and tuning needed time.
7, a kind of method of tuning circuit of the radio receiver that is used to retune, when this radio receiver by tuning the reception when wishing most signal of communication that a transmitter of network launches initially by transmitter non-, the tuned frequency of the tuning circuit of this wireless receiver retuned wish transmission communication signal on the channel of one group of channel determining on the frequency range that a transmitter of network launched most to receive by transmitter, it is characterized in that said method may further comprise the steps:
(a) power level of measurement transmission communication signal on each channel of one group of channel;
(b) select the measured power level of transmission communication signal on it to be higher than those channels of a Minimum Power Level, to constitute first grouping of channel;
(c) judge whether transmission communication signal wishes that by transmitter a transmitter of network is launched most on a channel of channel first grouping; And
(d) judging this signal of communication when said step (c) is when wishing most that by transmitter the transmitter of network is launched, with the frequency selecting tuning of the tuning circuit of the radio receiver channel to the transmitter emission signal of communication of being wished network by transmitter most.
8, method as claimed in claim 7 is characterized in that, used Minimum Power Level is a level relevant with measured power level in the measurement of step (a) in the step (b) that said selection channel divides into groups with the formation selected channel.
9, method as claimed in claim 7 is characterized in that, comprises the steps (e), initial be tuned to after the non-network of wishing most of transmitter, interval during with one of the initial time-delay of said step (a)-(d).
10, method as claimed in claim 9 is characterized in that, said time-delay step (e) is to delay time according to measuring with tuning time needs.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US5110893A | 1993-04-21 | 1993-04-21 | |
| US08/051,108 | 1993-04-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1104024A true CN1104024A (en) | 1995-06-21 |
Family
ID=21969396
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN94190170.XA Pending CN1104024A (en) | 1993-04-21 | 1994-04-06 | Method and circuit for retuning of a radio receiver |
Country Status (8)
| Country | Link |
|---|---|
| JP (1) | JPH07508392A (en) |
| CN (1) | CN1104024A (en) |
| BR (1) | BR9404826A (en) |
| CA (1) | CA2135917A1 (en) |
| FR (1) | FR2705185B1 (en) |
| GB (1) | GB2283394A (en) |
| IT (1) | IT1272980B (en) |
| WO (1) | WO1994024832A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021134411A1 (en) * | 2019-12-31 | 2021-07-08 | Arris Enterprises Llc | Downstream modem channel analysis and allocation system and method |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0768803A1 (en) * | 1995-10-11 | 1997-04-16 | Philips Electronique Grand Public | Scanning protocol for control signals in a cordless telephone |
| US6697607B1 (en) * | 2000-11-03 | 2004-02-24 | International Business Machines Corporation | Automatic receiver control upon initialization |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2402562C3 (en) * | 1974-01-19 | 1978-07-13 | Te Ka De Felten & Guilleaume Fernmeldeanlagen Gmbh, 8500 Nuernberg | Method for the automatic search of modulated radio channels |
| CA1282837C (en) * | 1987-03-20 | 1991-04-09 | Tetsuya Hanawa | Apparatus for selecting control channel in mobile communication system |
| US4905301A (en) * | 1988-07-28 | 1990-02-27 | Motorola, Inc. | Selective system scan for multizone radiotelephone subscriber units |
| US5203012A (en) * | 1992-02-10 | 1993-04-13 | Motorola, Inc. | Method and apparatus for optimum channel assignment |
| JP3196211B2 (en) * | 1992-05-08 | 2001-08-06 | モトローラ・インコーポレイテッド | Method and circuit for selecting tuning of a wireless receiver |
-
1994
- 1994-04-06 BR BR9404826A patent/BR9404826A/en not_active Application Discontinuation
- 1994-04-06 JP JP6523294A patent/JPH07508392A/en active Pending
- 1994-04-06 CA CA002135917A patent/CA2135917A1/en not_active Abandoned
- 1994-04-06 WO PCT/US1994/003787 patent/WO1994024832A1/en active Application Filing
- 1994-04-06 CN CN94190170.XA patent/CN1104024A/en active Pending
- 1994-04-20 IT ITRM940222A patent/IT1272980B/en active IP Right Grant
- 1994-04-21 FR FR9404781A patent/FR2705185B1/en not_active Expired - Fee Related
- 1994-11-30 GB GB9424240A patent/GB2283394A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021134411A1 (en) * | 2019-12-31 | 2021-07-08 | Arris Enterprises Llc | Downstream modem channel analysis and allocation system and method |
| US11405794B2 (en) | 2019-12-31 | 2022-08-02 | Arris Enterprises Llc | Downstream modem channel analysis and allocation system and method |
| US11647397B2 (en) | 2019-12-31 | 2023-05-09 | Arris Enterprises Llc | Downstream modem channel analysis and allocation system and method |
Also Published As
| Publication number | Publication date |
|---|---|
| ITRM940222A0 (en) | 1994-04-20 |
| IT1272980B (en) | 1997-07-01 |
| WO1994024832A1 (en) | 1994-10-27 |
| GB2283394A (en) | 1995-05-03 |
| ITRM940222A1 (en) | 1995-10-20 |
| GB9424240D0 (en) | 1995-03-01 |
| JPH07508392A (en) | 1995-09-14 |
| BR9404826A (en) | 1999-06-15 |
| FR2705185B1 (en) | 1996-08-02 |
| FR2705185A1 (en) | 1994-11-18 |
| CA2135917A1 (en) | 1994-10-27 |
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