CN1082786A - The Method and circuits of radio receiver selecting tuning - Google Patents
The Method and circuits of radio receiver selecting tuning Download PDFInfo
- Publication number
- CN1082786A CN1082786A CN93105681.0A CN93105681A CN1082786A CN 1082786 A CN1082786 A CN 1082786A CN 93105681 A CN93105681 A CN 93105681A CN 1082786 A CN1082786 A CN 1082786A
- Authority
- CN
- China
- Prior art keywords
- channel
- signal
- circuit
- power level
- group
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title abstract description 18
- 238000004891 communication Methods 0.000 claims abstract description 132
- 238000005259 measurement Methods 0.000 claims description 12
- 230000001934 delay Effects 0.000 claims 1
- 230000010267 cellular communication Effects 0.000 description 65
- 238000012545 processing Methods 0.000 description 22
- 230000005540 biological transmission Effects 0.000 description 21
- 239000000758 substrate Substances 0.000 description 14
- 230000001413 cellular effect Effects 0.000 description 13
- 238000010586 diagram Methods 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 230000005611 electricity Effects 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 238000012790 confirmation Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000013519 translation Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J1/00—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general
- H03J1/0008—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor
- H03J1/0091—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor provided with means for scanning over a band of frequencies
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/26—Circuits for superheterodyne receivers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Quality & Reliability (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Mobile Radio Communication Systems (AREA)
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
- Transmitters (AREA)
- Transceivers (AREA)
- Circuits Of Receivers In General (AREA)
Abstract
This method and circuit can make in wireless receiver selecting tuning to the group channel on the channel.This wireless receiver is tuning and measure the power level of sending signal separately to each selected control channel order.Only the power level of sending signal is just attempted its corresponding sender above the control channel of certain value and realize link communication.In the time of can not realizing communicating by letter, the level of the signal that sends on each control channel be surveyed in receiver partial circuit outage certain hour and then energising again.Increase on the certain value if record the level of a control channel, then attempt realizing link communication with the sender that on this channel, sends this signal.
Description
The present invention relates to radio receiver, particularly radio receiver is to the relevant circuit of the tuning method of a certain channel selection in one group of channel and this method of realization.
The work of a communication system is transmission information between two or more communication point, and it should comprise a sender and a receiver at least, is communicated with by a communication channel between the two.Wireless communication system is a kind of like this communication system, and communication channel wherein includes a wireless channel, and this wireless channel is limited by frequency range in the communication band.
The sender part of forming wireless communication system includes the circuit that information translation is become to be suitable for a kind of signal form of transmitting on a wireless channel.Include modulation circuit in the sort circuit, in order to realize being called the signal processing of " modulation ".In this kind processing, with the information carrying that transmits to a radio frequency electromagnetic that is commonly referred to " carrier signal ".Formed signal is commonly referred to as " modulated signal ".Because this modulated signal includes the information that will communicate by letter between sender and receiver, so the signal that is formed by modulation is also referred to as " signal of communication ".
Know, by various modulation systems make the information carrying on the carrier signal so as to forming signal of communication.For example, amplitude modulation, frequency modulation, phase modulation and their modulation systems such as combining form are arranged, these can make on information carrying to a carrier signal, form signal of communication.
The advantage of wireless communication system is, do not need being connected of entity between sender and receiver, information signal removed modulated carrier signal and after forming modulated signal, it can be sent to distant location.
In addition, on the different frequency of electromagnetic spectrum, can there be many modulated signals to transmit simultaneously.In electromagnetic spectrum, do the signal of communication transmission in some frequency range on the channel of defined, exercise management by management organization.
Two-way radio communications system is a kind of like this wireless communication system, and it is similar to above-mentioned the sort of wireless communication system, but also allows both to send to information to a communication point, can send information by this communication point again.Each communication point in the two-way radio communications system includes a sender and a receiver simultaneously.Be arranged on sender and receiver on a certain communication point, the unit that generally is called " radio set " by or is called " transceiver " is more quickly and easily formed.
Cellular communication system is a kind of wireless communication system of two-way pattern; In the region that cellular communication system held, can communicate with the radio set that is arranged on place, arbitrary place.
The foundation of cellular communication system is that many fixed-site radio sets that are called the base station are arranged on the communication point that separates, and spreads all over whole communication region.It is online that each base station all is connected to conventional telephone.In addition, each base station is associated with the part of communication region, and each related part of many base stations is close on the position mutually.Wherein each part is called as " honeycomb grid ".Many honeycomb grids have correspondingly been stipulated in each base station in many base stations, and they lump together, and have determined the overlay area of cellular communication system.
In cellular communication system, radio set can be described as " radiophone "; Be positioned at the radiophone on any communication point of cellular communication system overlay area, can communicate by the user in the cable telephone network of base station and routine.The signal of communication that is provided by radiophone is transferred to a base station, and the cable telephone network by routine is transferred to desirable wire user place then, realizes telephone communication thus.Also can lead to the radio telephone place and realize telephone communication from wired user place.
The operation stipulations of habitually practising in most of cellular communication systems are to determine radiophone to which base station in the cellular communication system sends and receiving communication signal.Realize the signal of communication transmission from a base station to a radiophone, be referred to as " downlink communication "; Realize the signal of communication transmission from a radiophone to a base station, be referred to as " uplink communication ".
The frequency range of distributing to cellular communication is divided into many channels, and these channels further are divided into control channel and traffic channel again.In common cellular communication system, control channel has different frequencies with the traffic channel regulation.In the system that uses time-division multiplex technology, control channel and traffic channel also may be defined on the same channel, but will stipulate out different application time slots.
Control channel is to be distributed by the base station, in order to transmit communications signals, be called control signal herein.Radiophone is done the operation (both during the radiophone energized, again in the ground scanning of utilization period) of scan control channel.Radiophone is confirmed the power level by the signal of control channel transmission, and this kind value that records is reacted, and the information content of the control signal that one of control channel is sent is confirmed in trial.In this stage of signal transmission, if the selected control signal information content that control channel sent can confirm that and the control signal information content that this control channel sends meets the standard of predesignating, and then can realize downlink communication.The tuning of the collection of letters circuit of radiophone remains on the selected control channel.In fact, this radiophone is tuned to selected control channel, and " listening attentively to " is by the information that is sending there.This of radiophone kind of utilization is referred to as radiophone " (camping) camps " sometimes, in a single day and realize downlink communication between base station and the radiophone, claim this radiophone just " camp in a base station (or a honeycomb grid place) " sometimes.
Downlink communication is after finishing between radiophone and the base station, and perhaps the collection of letters circuit of radiophone can cut off the power supply, and only according to the energising again of required time duty cycle ground.Collection of letters circuit switch on again during in, monitor the control signal information content that selected control channel (being the control channel that radiophone " is camped ") sends again.(it may be noted that control signal also sends by traffic channel sometimes.But, the transmission of this type of control signal generally be between radiophone and base station, finished link communication after).
Because the energising of collection of letters circuit is just periodic, so after finishing downlink communication with the base station, the energy consumption of this kind circuit is minimum.
When radiophone being sent calling, the information content of control signal is guided radiophone into some traffic channel, can begin conversation then.
Because the increasing of this type of cellular communication system popularization, the great majority of this type of cellular communication system often are operated in the full load state.That is to say that each the applicable traffic channel in the frequency range that assignment is used to cellular communication often all has been used.In order to make this class cellular communication system admit the user of greater number, developed some schemes and more effectively utilized those to distribute to the frequency range of purposes in this respect.
Especially, in order to increase load capacity, each cellular communication system is all gone into more effective modulation system at this.Information signal is used discrete modulation system of encoding, the channel that can more effectively utilize assignment to use to cellular communication.Therefore, using this type of modulation system can make more user utilize a cellular communication system simultaneously.The signal of communication that this type of modulation system produces is suitable for transmitting with the top time-division multiplex technology of mentioning briefly.
Common cellular communication system and the cellular communication system that increases load capacity usually belong to incompatible system.That is to say, be operated in the radiophone in the common cellular communication system, can not be operated in the cellular communication system that increases load capacity.(but, the dual-mode wireless telephone set can doublely be operated in two kinds of cellular communication systems, this type of dual-mode wireless telephone set includes two parts circuit, wherein a part of circuit working is in a kind of system, another part circuit working is in another kind of system, which partial circuit to carry out work as for, depend on the communication system that radiophone uses).
Two or more cellular communication systems are being set in some region sometimes.For example, be arranged on common and two kinds of cellular communication systems increase-volume in some region, each of two kinds of systems respectively provides cellular covering.In other regions, common cellular communication system only is being set.(system that may have only similarly, an increase-volume in the region, a place).And in other region, cellular communication system is not set.
As noted above, when the collection of letters power on circuitry of a radiophone, this radiophone is searched for each control channel, whether exists the control signal that control channel sends to detect.If radiophone is in the region that does not belong to cellular covering, then this search of control channel is come to nothing, detect the signal that sends less than arbitrary base station.
In addition, the radiophone that supplies to work in a certain cellular-specific shape communication system (also being the common cellular communication system or the cellular communication system of increase-volume) and produce, when its service position was in another and incompatible cellular area of coverage that cellular communication system provided, whether the control signal that control channel sent that can not detect regulation in the cellular communication system that radiophone works existed.
Because the frequency range that the common cellular communication system and the cellular communication system of increase-volume are worked has overlapping frequency, so, during radiophone Search Control channel, may detect the control signal that sends by another cellular communication system.Yet, because be incompatible between two systems, so to the information content of detected signal thus, this kind radiophone can not add their confirmation.
Many radiophones are produced by working in the powered battery mode.Because battery supply electric energy stored finite capacity is so this type of radiophone can only continuous operation in one limited period.Radiophone, need be powered to radiophone during in the hope of the control signal that obtains their and send at the Search Control channel.Whether the radiophone not only signal of Search Control channel transmission exists, and also will additionally determine the information content of detected any signal.
If the position of radiophone is in the cellular covering region that does not have cellular covering or have only incompatible cellular communication system, then radiophone will cause exhausting of supplying cell stored energy to the continuous search of control channel.So under so continuous search, the luxus consumption of stored energy will seriously limit the radiophone air time subsequently during owing to the Search Control channel.
Therefore need a kind of being used for restriction radiophone in the time link communication can not being set up to the continuous searched devices of control channel with a base station.
So advantage of the present invention provides out a kind of method and relevant circuit, in order to overcome the shortcoming of prior art.
Another advantage of the present invention provides out a kind of in order to limit the radiophone device of Search Control channel continuously in the time can not setting up link communication with a base station.
The present invention also includes other advantage and characteristic, will be more clear behind the preferred embodiment that its details can be described in detail below perusing.
According to the present invention, it discloses a kind of method and the concrete relevant circuit of implementing this method, so that the tuning circuit selecting tuning of radio receiver is on by a certain channel in one group of channel of a frequency range regulation.Each channel in this group channel all is suitable for transmitting a certain signal of communication that sender sends in the sender of a group distant place.And the tuning circuit of wireless receiver is tuned on each interior channel of one group of channel of this frequency range regulation.It measures the power level of the signal of communication that each channel sends in this group channel.Those are recorded the channel selection of its signal of communication power level on predetermined Minimum Power Level come out, form one first sub-channel-group.And make following judgement; In the wireless receiver and the first sub-channel-group, to not realize link communication between the sender out of the ordinary of transmission signal of communication on each channel.If this kind link communication is possible, just can realize that the sender of link communication chooses with wireless receiver, make radio receiver tuning circuit be tuned to this sender send on the channel of signal of communication.
Peruse following accompanying drawing, will clearer understanding be arranged the present invention.Wherein,
Fig. 1 is the schematic block diagram of the part of a cellular communication system, and the circuit of method of the present invention and preferred embodiment finds application in this system;
Fig. 2-1 summary shows bright a part of frequency range of distributing to cellular communication usefulness;
Fig. 2-2 summary shows the bright time slot example of stipulating on the single channel when utilizing time-division multiplex technology;
Fig. 3 is the formation block diagram that includes the radio receiver of preferred embodiment of the present invention circuit;
Fig. 4-1 shows the relation between control signal power level that preferred embodiment of the present invention duration of work records and the dynamic noise substrate that derives thus;
Fig. 4-2 shows control signal power level that preferred embodiment of the present invention duration of work records and the relation between the absolute value noise floor;
Relation between this signal power level of signal power level that Fig. 5 way of example shows had before recorded and measurement again; The comparison of this type of power level is utilized at preferred embodiment of the present invention duration of work;
Fig. 6 is the logical flow chart of a kind of algorithm among the method embodiment of the preferred embodiment of the present invention;
Fig. 7 is the logical flow chart that the method step of the preferred embodiment of the present invention is arranged;
Fig. 8 is the circuit block diagram of the radio receiving-transmitting unit of the preferred embodiment of the present invention.
At first, referring to the cellular communication system schematic diagram of Fig. 1, its overall reference number number is 100.Base station that a lot of location intervals opens forms by being provided with in the whole region for as described above, cellular communication system.Among Fig. 1, these base stations are indicated with stain 104,108,112,116,120,122,126 and 130.Though, be that example goes out 8 base stations among the figure, will of course be appreciated that, with the typical cellular communication system of cellular communication system 100 representatives, include the much bigger base station of number usually.
In the base station 104,130 each includes the circuit of the signal of communication that can send to a plurality of radiophones transmission base station, and these radiophones are should be in the near zone of each corresponding base station; Each base station and including receives the circuit of the signal of communication that these many radiophones send.
Among the 104-130 of base station each all connects mutually with the cable telephone network of a routine.Among the figure, this connection is interconnected with base station 130 and cable telephone network 138 by circuit 134.Being connected and roughly the same representing between each base station 104-126 of cable telephone network 138 and other.
Each site among the base station 104-130 of composition cellular communication system 100, all to carefully select, with guarantee " be positioned in the whole region that covers by system 100 place, arbitrary place the signal of communication that radiophone was sent, have at least a base station that is being provided with to receive "; Like this, also just determined the cellular overlay area of this system.That is to say in whole region, to have at least one to be to be within the transmission range of the radiophone on arbitrary place in the region among the 104-130 of base station.(because of the maximum signal of the signal that sends by the base station, and the maximum transmitted scope of signal, general maximum signal and corresponding maximum transmitted scope thereof greater than the signal that sends by radiophone, so, when setting the base station location of cellular communication system, the maximum transmitted scope of the signal that radiophone sent is the primary factor of necessary consideration).
Because the interval character that each base station location is set, in the residing whole region of base station 104-130, the each several part of region all is associated with each other base station.With the mutually closely adjacent each several part region of each isolated base station 104-130, be referred to as " grid ", they are represented by zone 144,148,152,156,160,162,166 and 170 in the drawings.Grid 144-170 has formed whole region jointly, and has determined the area of coverage that cellular communication system 100 covers.Be in the radiophone in arbitrary grid boundary among the grid 144-170 of system 100, all can interrelate with one of base station 104-130 at least, send or receive modulated signal there from it to its.
Again as previously described, in cellular communication system, start the general stipulations of communication operation, must comprise by radiophone detecting the signal of communication that is referred to as control signal herein, and that is to be sent by each control channel of stipulating in the communication system by each base station.Each base station in the cellular communication system transmits control signal on the control channel of predesignating, in order to indicate the existence of this base station, and in a single day radiophone confirms the information content of the control signal that sends on the selected control channel, and downlink communication is just realized with this radiophone in the base station.(again, when utilizing time-division multiplex technology, control channel can be defined on the identical frequency with traffic channel, but works in different time slot sections).
Downlink communication between radiophone and the base station is after finishing, perhaps, the some parts of radiophone collection of letters circuit can cut off the power supply, subsequently required time empty than on energising again so that confirms the information content in the time by the control signal of control channel transmission in total periodic intervals.
Making to radiophone when calling out, the information content of control signal (also being data) to radiophone indicate want be tuned on the specific traffic channel of cellular communication system defined, so that between radiophone and base station, carry out two-way communication.Otherwise the some parts of radiophone collection of letters circuit cuts off the power supply according to the required time duty ratio.
Yet, when radiophone is in outside the area of coverage of cellular communication system, it does not produce the input that allows to carry out link communication to the search of communication system control channel, for example, showing bright radiophone 174 among Fig. 1, is a radiophone outside the cellular area of coverage that is positioned at cellular communication system 100.In the time of outside radiophone is in the cellular area of coverage, it to the search of control channel do not cause with system 100 in arbitrary base station sends among the 104-130 of base station certain signal realize link communication.Search repeatedly to each control channel in the communication system detects the signal existence that does not send, and the information content of confirming detected arbitrary signal, is to need spended time and catabiotic.Because radiophone is by battery power under many occasions, thus wish the power consumption of restricts radio phone, so that the exercisable time of radiophone under this battery supply of application is the longest.
Again as previously described, because the introducing of the cellular communication system of increase-volume, the cellular area of coverage of two or more cellular communication systems may be on the region and all have overlapping on the frequency.Among Fig. 1, stain 204 and 208 is represented the base station of second cellular communication system, and the grid 214 and 218 shown in the dotted line is represented the area of coverage of the grid of second cellular communication system.And the area of coverage that shaded area 222 has been represented two cellular communication systems overlapping on the region.Being in the radiophone of zone in 222 can both be detected the control signal that base station 208 in base stations 122 in the system 100 and second communication system sends.Control channel to native system in the cellular communication system that radiophone is worked carries out searching period, and this radiophone may detect the control signal that send the base station of another communication system.But when two communication systems are incompatible, can not realize downlink communication with the base station of another cellular communication system.Therefore, radiophone for from then on plant on the control channel detect control signal can ignore.
In addition, in the communication system that radiophone is worked (herein, as example, be cellular communication system 100), if originally this radiophone is in outside the cellular area of coverage of system, but transfer to subsequently within the area of coverage of cellular communication system again, then work as it and in a single day enter within the area of coverage, this radiophone must be able to detect the existence of the control signal that is sent by communication system inner control channel.But, to the control channel of communication system carry out this kind continuously search be suitable power consumption to detect the existing of control signal.
Fig. 2-the 1st distributes to the schematic diagram of a frequency range of cellular communication usefulness, and its overall reference number is 300, and frequency range 300 is divided into many channels, some called after control channels of certain wherein, sign do D1, D2 ... D
n, and other called after traffic channels, sign do V1, V2, V3 ... V
nAlong with the energized of radiophone, according to setting up link communication to start the general stipulations of utilization with a base station, this radiophone is searched for each control channel of frequency range 300 regulations.
Fig. 2-2 summary shows that bright this paper designated reference number is the schematic diagram of 306 single channel, and a plurality of time slots of stipulating in the time at one-period.It has shown a plurality of time slots of when utilizing time-division multiplex technology single channel being stipulated.Thus, determine many time slots on the channel 306.Name among the application drawing 2-1, time slot V1 to Vn is defined as traffic channel, and other time slot D1 to Dn is defined as control channel.
Used identical name among Fig. 2-1 and Fig. 2-2, this is because method of the present invention and preferred circuit all can be done the search operation to the control channel of stipulating in conventional formula system and the time division multiplex system.
This kind radiophone collect mail part tuning circuit with radiophone be tuned to each control channel D1, D2 ... on the Dn, whether exist with the control signal that detects any control channel transmission.The power level of detected arbitrary control signal is measured on arbitrary control channel, then the sender (according to the affirmation that this kind is recorded the information content of signal) that sends out the maximal power level signal is attempted to realize link communication.
When radiophone was confirmed the information content of control signal, just sender was realized downlink communication therewith.That is to say that if the trial that will set up downlink communication with the base station in the incompatible cellular communication system, this radiophone is the information content that can not confirm this kind control signal.When attempt with cellular communication system in one of each base station when realizing link communication, radiophone is tackled this kind data-signal and is ignored when Search Control channel continuously.
It may be noted that collection of letters circuit can be fast to the detection of signal power level and efficient (be energy consumes little) make definitely, and determine to need the information content of detected coded signal signal processing circuit usually and carry out by receiver.Need the bigger energy of consumption rate during this kind circuit working.The present invention help making this kind treatment circuit the time that must move reduce to minimum.
Its overall reference number that refers now to Fig. 3 is 400 preferred embodiment of the present invention circuit formation block diagram, and it includes several parts that surrounded in the frame of broken lines.As shown in Figure 3, circuit 400 has been formed a part of circuit that overall reference number is 406 wireless receiver.For example, radio receiver 406 can partly be made up of the receiver circuit in the wireless set, and this radio receiving-transmitting unit for example is the radiophone that is operated in the cellular communication system.
The work of radio receiver 406 is control channels that search is predesignated, and whether the control channel D1-Dn shown in Fig. 2-1 or Fig. 2-2 exists with the control signal that detects each other control channel transmission.
What some lines at reference number 412 places were represented is the electromagnetic wave that is sent by the sender control channel, is for example sent by sender 416, and they are received by the antenna 418 of receiver 406.The signal of the reflection control channel information that is received by antenna 418 produces electromotive force on circuit 420, offer able to programme tuning/lower frequency changer circuit 422.Circuit 422 is tuned on some channel receiver under the effect of the signal that provides on the circuit 436, at first is to be tuned on the control channel here.
Some signals that produce on the circuit 422 online 448, this is the control signal when representing the circuit 422 of receiver 406 to be tuned at certain some certain tones road.The signal that forms on online 448 is fed to demodulator 458 and signal strength measurement circuit 468.Produce restituted signal on the demodulator 458 online 464, offer decoder 470.Produce some signals on the decoder 470 online 476, impose on processing apparatus 482.Produce decoded signal in the work of decoder 470 also online 486, it is fed to for example is the transducer 488 of a loud speaker.
Produce a signal on the signal strength measurement circuit 468 online 492, be fed to the input of processing apparatus 482, the power level information of the signal that on processing apparatus 482 provides about line 448, produces.Because the signal that produces on the line 448 has reflected the signal that antenna 418 receives, so its level of signal that produces on the line 492 similarly reflects the power level of the signal that antenna 418 receives.
Also show brightly among the figure, memory cell 496 is connected to processing apparatus 482 by line 498.
During work, radio receiver 406 is at first searched for each of one group of predetermined control channel of communication system defined, whether exists to detect the control signal that control channel sends.
Processing apparatus 4482 produces signal on circuit 436, make circuit 422 be tuned in each control channel successively.When receiver 406 is tuned to each control channel, produce some signals by electricity on 422 online 448, they have reflected detected signal from each relevant controlling channel.Signal strength measurement circuit 468 is measured the amplitude of the signal that is produced on online 448, thereby provides the signal that reflects their power levels on online 492.Processing apparatus 482 is stored in this measured value in the memory cell 496.Processing apparatus 482 channel associations that will survey one power level and send out this type of signal in service.
After the power level of the data-signal of measuring each control channel transmission, the work of processing apparatus 482 is to decision making, and should attempt setting up downlink communication with the sender of one of control channel that transmits control signal.
In order to make this kind judgement, processing apparatus 482 is formed the first sub-control channel group from one group of control channel.Each control channel of forming the first son group is chosen, the power level of the control signal of its transmission is reacted.
In a preferred embodiment, have only power level that its data-signal has to surpass one of following person's control channel, just be selected the composition first sub-control channel group: 1) dynamic noise substrate level; 2) absolute value noise floor level.
The establishment of dynamic noise substrate is to rely on the power level of each control signal that signal strength measurement circuit 468 is recorded to make comparisons.Noise floor is established on such power level, that is it exceeds a certain numerical value than the power level of the minimum value that records.
Fig. 4-the 1st, the schematic diagram of establishment dynamic noise substrate, the lines 550 expression dynamic noise substrates among the figure.The signal that each arrow 560 expression is received on each control channel by receiver among Fig. 3 406.The height of each arrow 560 characterizes the power level of this kind signal.Lines 550 characterize out the dynamic noise substrate of establishing with certain power level, this certain power level is shown bright by line segment 570, it is on the signal power level of lowest power level, and the signal of this kind lowest power level is to have been represented by the arrow 560 that is positioned at the rightmost side in the drawings.The power level of every its data-signal all is selected and forms the first sub-control signal channel group first sub-channel-group greater than those channels of this noise floor.Because the size of this dynamic noise substrate depends on the power level value that records, so so this kind noise basis floors of establishing is variable, it depends on the power level of the control signal of actual survey one.
The absolute value noise floor is the power level of a selected value.Show among Fig. 4-2 and understand the absolute value noise floor, it is represented by lines 605.Each arrow 610 expression among the figure are from the detected signal of each control channel.By each signals of arrow 610 representatives corresponding among Fig. 4-1 by each signal of arrow 560 representatives, the height of each arrow has also characterized the power level of signal.Every its control signal power level also all is selected and forms the first sub-control channel group (the first sub-channel-group) greater than those channels of this noise floor.
Therefore, in a preferred embodiment,, all be selected and form the first sub-control channel group for the control channel of its power level of control signal that sends greater than dynamic noise substrate or absolute value noise floor.
Only those are sent the sender of the first sub-control channel group of signal on control channel, just attempt between sender that transmits control signal and receiver 406, realizing link communication.
Have only when decoder 470 to indicate when having effective control signal information, could realize link communication, this control signal is by decoder 458 demodulation, and is added on the line 464.(just, when the selected control signal information content that control channel sent may be identified, producing some signals on decoder 470 ability online 476).Produce and present signal by decoder 470 on online 476, shown being correctly decoded this kind control signal information content to processing apparatus 482 inputs; Therefore also show, may realize link communication with the sender that sends this kind control signal.
If the sender that transmits control signal for each control channel in the first sub-control channel group, can not any realize link communication with it, then radio receiver is before attempting setting up a link communication with sender once more, its break-off regular hour.In period, the partial circuit of receiver can cut off the power supply at this section, uses so that limit the energy of receiver 406 during this period.(for example, this section is in the period, and the decoder 470 that is become by bank of digital signal processors can cut off the power supply usually).
In a preferred embodiment, the time span of receiver partial circuit outage is less than a fixed amount time (for example 15 seconds), and this time length is provided by following formula:
The number of channel of the sub-control channel group of TP=(x+(y * first)) * z%
In the formula,
TP is to be the time span of unit with the second;
X measures the required time to the data-signal power level that arbitrary control channel sends;
Y be attempt setting up link communication with one of base station when making decision after, circuit 422 is tuned to the required time on the specific control channel with receiver 406;
Z is the duty ratio of time of desired radio receiver work.
Time period of receiver partial circuit outage in the past after, whole circuit blocks of receiver 406 all add again and power on, circuit 422 is task again, with receiver be tuned on each control channel in the frequency range.Measure again by 468 pairs of power levels of circuit, and the signal that shows the power level that this type of records on the line 492 is fed to processing apparatus 482 about each signal of each control channels transmission.The work of processing apparatus 482 is that the measurement power level again of the control signal of each relevant controlling channel transmission is made comparisons, and this type of corresponding power level of measuring the previous measurement of each control channel signal transmitted in the power level and the first sub-control channel group is again compared.
The work of processing apparatus 482 is to form the second sub-control channel group.Those control channels that have only its data-signal to have following power level, just be selected the channel of forming the second sub-control channel group: 1) its power level before had been lower than the dynamic noise substrate, and was higher than this dynamic noise substrate under measuring again; 2) its power level before had been lower than the absolute value noise floor, and was higher than this absolute value noise floor under measuring again; 3) demonstrate power level remarkable rising (for example, power level increases 6 decibels) is arranged.Then, only attempt to realize link communication with the second sub sender of organizing interior control channel transmission signal.Decoder 470 is task again, produces signal on online 476 and shows brightly whether may realize link communication.
(it may be noted that and also can adopt other method to select the second sub-control channel group.For example, above substituting 1) and 2) two kinds of situations, can form the second sub-control channel group with such control channel, promptly their data-signal power level before had been lower than dynamic noise substrate and absolute value noise floor, then was higher than one of two kinds of noise floor when measuring again).
Fig. 5 shows that processing apparatus 482 definite which channel are selected to form the second sub-control channel group.Only with the second sub-control channel group in control channel on send signal those senders attempt to realize link communication once more.
Among the figure, horizontal line 650 is represented the dynamic noise substrate, and horizontal line 655 is represented the absolute value noise floor.(relative size that it may be noted that two kinds of noise floor also can be exchanged, and promptly the numerical value of absolute value noise floor can be higher than the dynamic noise substrate.) arrow 606 represents its power level that originally records of signal that control channel sends under noise floor 650 and 655.(it may be noted that noise floor 650 and 655 corresponds respectively to the noise floor 550 and 605 among Fig. 4-1 and Fig. 4-2.) control channel that sends out signal 606 do not form a part of the first sub-control channel group, this is because the power level of signal 606 is under the noise floor when originally measuring.
Yet, at the work stoppage of receiver after one period of determining by above-mentioned algorithm, the power level of the signal that sends on each control channel is measured again; Now, the signal that provides on same control channel is to represent with the arrow shown in the dotted line 644 in the drawings, and it is higher than in the noise floor one at least.This control channel just is selected the control channel of forming the second sub-control channel group.Then, attempting with the second sub-control channel group in the selected sender that transmits control signal on the control channel of making realize downlink communication.Control signal power level for its transmission has the control channel (whether surpassing a certain noise floor no matter it measures level value again) that enlarges markedly, and also chooses and forms the second sub-control channel group.Sort signal is represented with the arrow shown in the dotted line 670 in Fig. 5.
If the power level of the data-signal that sends on each relevant control channel has all been carried out measuring again, can not carry out downlink communication, then radio receiver 406 a period of time of break-off again, the receiver partial circuit is cut off the electricity supply again.In a preferred embodiment, the scheduled time length of break-off is corresponding to a set time length or above-mentioned algorithm time span that bigger time span among both.
Just, the time span of receiver partial circuit outage equals the individual the greater in the time span that a set time amount (for example 15 seconds) and following formula provide:
The number of channel of the sub-control channel group of TP=(x+(y * first)) * z%
In the formula,
TP is to be the time span of unit with the second;
X measures the required time to the data-signal power level that arbitrary control channel sends;
Y be attempt setting up link communication with one of base station when making decision after, circuit 422 is tuned to the required time on the specific control channel with receiver 406;
Z is the duty ratio of time of desired wireless receiver work.
Referring again to Fig. 1, when radiophone was positioned at outside the cellular area of coverage of cellular communication system 100, the signal that is sent on each control channel by each base station was all under noise floor.Its circuit constitutes the radiophone that is analogous to wireless receiver 406, will can not attempt setting up downlink communication with arbitrary base station of this type of signal of transmission on arbitrary control channel.Yet, when this radiophone shift position is to the cellular area of coverage of cellular communication system 100, the data-signal power level that each base station sends on each control channel is measured again, then having its power level of control signal now at least will be above noise floor, noise floor, perhaps its power level enlarges markedly.To sending each control channel of this type of data-signal, just will combine choose the control channel of forming the second sub-control channel group, and make a try and link communication is realized in the base station that sends one of this class control channel.Make with each control channel on after arbitrary sender of transmitting control signal can not set up the judgement of link communication, the partial circuit of radio receiver can reduce to minimum along with cutting off the power supply so the energy of radiophone uses in one period scheduled time.
This selection control channel repeats with the process of forming the second sub-control channel group, constantly attempts realizing downlink communication, and if can not realize downlink communication, then the receiver partial circuit continues to take place powering-off state.In selected time of experience for example after 10 minutes, if still can not realize downlink communication, just Circuits System initialization once more redefines the first sub-control channel group.
See the logical flow chart of Fig. 6 now, its overall reference number number is 680, and it illustrates a kind of algorithm of having formed the preferred embodiments of the present invention methods.At first, bright shown in square frame 684, the power level of the signal that sends on each control channel is measured.Square frame 688 shows understands the composition first sub-control channel group.Square frame 692 shows bright, and the sender that transmits control signal on make a try next and this type of control channel is set up downlink communication.
On decision block 696, make the judgement that whether may realize a downlink communication.If possible realize downlink communication, the branch road of "Yes" leads to square frame 700, and the tuned frequency of receiver tuning circuit maintains on the frequency of selected control channel.Otherwise the square frame 704 shown in arriving along the branch road of "No" stores the power level that records; And shown in square frame 708 places, the receiver partial circuit cut off the power supply in a period of time.
After passing by during this period of time, the receiver partial circuit is switched on again, and is bright shown in square frame 710, and the power level that is transmitted control signal on each control channel is measured again.Shown in square frame 712 on, form the second sub-control channel group; And shown in square frame 716 places, attempting with one of this type of control channel on a sender transmitting control signal set up downlink communication.
On decision block 720, make the judgement that whether may realize a downlink communication.If possible realize downlink communication, the branch road of "Yes" leads to square frame 724, and the tuned frequency of receiver tuning circuit maintains on the frequency of selected control channel.Otherwise the square frame 728 along shown in the branch road of "No" stores the power level that records, and upgrades the power level of falling to have stored; And shown in square frame 732 places, receiver partial circuit outage a period of time.
After passing by during this period of time, decision making in 736 places at decision block, when square frame 684 is measured the power level of each control signal for the first time, whether pass by distance (for example 10 minutes).If then branch road leads to square frame 684, top process repeats; If not, then branch road leads to square frame 710, and the power level of each control signal is measured again.
See the logical flow chart of Fig. 7 now, its overall reference number number is 750, and it lists the preferred embodiment operating procedure of method of the present invention.On the channel in one group of channel stipulating in tuning circuit selecting tuning to a frequency range of method 750 with radio receiver.Each channel in this group channel all is suitable for transmitting by a group signal of communication that a certain sender sends in the sender at a distance.
At first, bright shown in square frame 756, the tuning circuit of radio receiver is tuned in this frequency range on the channel in one group of channel.
Then, shown in square frame 762, the power level of the signal of communication of individual channels transmission in this group channel is measured.
The back with its measured value of signal of communication power level those channels on Minimum Power Level that send, chooses and forms the first sub-channel-group shown in square frame 768 again.
Next step is decision making shown in square frame 774 again, sends on each channel between the sender out of the ordinary of signal of communication in the radio receiver and the first sub-channel-group, could realize link communication.
Then, shown in square frame 778 and 782 in two kinds of situation.At square frame 778 places, tuning circuit selecting tuning to a sender of wireless receiver is sent out on the channel of signal of communication, the wireless therewith receiver of this sender may be realized a link communication.In square frame 782, be divided into for four steps: on each channel in the one group of channel that 1) tuning circuit of wireless receiver retuned; 2) measure the power level of each signal of communication again; 3) select, form the second sub-channel-group; 4) in the time may realizing link communication with it, radio collected mail number want on the channel in the sub-channel-group of selecting tuning to the second.
See Fig. 8 at last, its overall reference number number is 800, and it is, for example the formation block diagram of the radio set of radiophone.Transceiver 800 includes circuit 806 preferred embodiment of the present invention, that be made up of each parts in the frame of broken lines.Circuit 806 is corresponding to the circuit among Fig. 3 400.The receiver of radio set 800 partly is analogous to the radio receiver 406 shown in Fig. 3 block diagram, so, its working condition do not remake be described in detail.The receiver part 806 of observing radio set 800 as seen, radio receiving-transmitting unit 800 includes antenna 818, line 820 is connected above it, with antenna 818 be coupled to mutually able to programme tuning/lower frequency changer circuit 822 on.The work of circuit 822 is subjected to add on the line 836 control of its input signal.Produce a signal on the circuit 822 online 848, it is fed to demodulator circuit 858 and signal strength measurement circuit 868.Produce a restituted signal on the demodulator circuit 858 online 864, it is fed to decoder 870.
Produce a signal on the decoder 870 online 876, it is fed to an input of processing apparatus 882.Produce a decoded signal on the decoder 870 also online 886, it is fed to for example is the transducer 888 of a loud speaker.Signal strength measurement circuit 868 produces a signal, and it adds to processing apparatus 882 by warp 892.Other has memory cell 896, by line 896 also with processor 882 coupling connection mutually; 899 on line provides an outside input to processing apparatus 882.
Radio set 800 also includes a sender part, and as shown in the figure, it generally comprises following parts: one for example be microphone transducer 908, encoder 912, modulator 916, able to programme tuning/up-converter circuit 922.The control of the input signal that provides by line 928 is provided in the work of circuit 922.Produce a signal on the circuit 922 online 934, it is coupled to antenna 818, from sending out information signal here.
Above, in conjunction with showing that by each accompanying drawing bright preferred embodiment has illustrated the present invention; But should be understood that, for described embodiment, when finishing identical function of the present invention, also can use other similar embodiment and modify or add, but not depart from the format invention.So the present invention should not be restricted to any single embodiment, and should limit in broader scope according to claims cited in the annex.
Claims (10)
1, a kind of usefulness so that the tuning circuit selecting tuning frequency of radio receiver, make it be tuned to circuit on the channel in one group of channel stipulating in frequency range, each channel in this group channel is suitable for transmitting the signal of communication that is sent by a sender in its distant place sender of a group, and described circuit is characterized in that comprising:
Tuner is used so that the tuning circuit of radio receiver is tuned on interior each channel of one group of channel stipulating in this frequency range;
Measure and storage device, in order to measuring in this group channel the power level of the signal of communication that sends on the channel separately, and in order to store the power level value that records thus;
Choice device surpasses each channel selection of a predetermined Minimum Power Level now to form the first sub-channel-group in order to the power level that will record its signal of communication;
Decision maker could realize link communication in order to judge between radio receiver and sender separately, and above-mentioned sender is the sender that sends out signal of communication in the first selected sub-channel-group on each channel;
The selecting tuning device, when described circuit arrangement is decision making, in the time of may realizing a link communication, on the channel of frequency selecting tuning with the radio receiver tuning circuit, might realize with it that on this channel the sender of link communication sends out signal of communication.
2, the circuit in the claim 1 is characterized in that, described tuner comprises the device on each channel in one group of channel that wireless receiver is tuned in proper order stipulate in this frequency range.
3, the circuit in the claim 1 is characterized in that, the device of described measurement power level comprises the device of measuring the amplitude of each signal of communication on the channel separately.
4, the circuit in the claim 1 is characterized in that, the power level that is recorded by described measurement mechanism is stored in the memory cell.
5, the circuit in the claim 1 is characterized in that, uses described choice device to select channel applied Minimum Power Level when forming the first sub-channel-group to include an absolute value of predesignating Minimum Power Level.
6, the circuit in the claim 1, it is characterized in that, being used for to selecting channel applied Minimum Power Level when forming the first sub-channel-group by described choice device, is a level that is associated with the measured power level of described measuring circuit device.
7, the circuit in the claim 6 is characterized in that, the Minimum Power Level value is corresponding to a predetermined level bigger than the minimum value power level that records.
8, the circuit in the claim 1, it is characterized in that, described decision maker is in order to judge when to realize a link communication, and this device comprises: decoding device, in order to the signal of communication that sends on each channel in the first sub-channel-group of selecting is decoded to form the decoded signal device; And comparison means, the response decoded signal compares the data of storing in decoded signal and the radio receiver.
9, the circuit in the claim 1 is characterized in that, it also comprises: the device that retunes retunes in this group channel on each channel in order to the tuning circuit with radio receiver; Measurement mechanism again is in order to measure its power level again to the signal of communication that sends on the channel separately in this group channel; The frequency-selecting duct device demonstrates those channels that increase on certain level in order to the power level for signal of communication, chooses to form the second sub-channel-group; Decision maker in order to for the sender separately that sends out signal of communication on each channel in the second sub-channel-group, is judged and could be realized link communication between the sender separately therewith at radio receiver; And the selecting tuning device, when this link communication may be realized, on channel in the sub-channel-group of radio receiver selecting tuning to the second.
10, the circuit in the claim 9 is characterized in that, it also comprises the delay operating means, in order to after above-mentioned decision maker is decision making, makes scheduled time of delays in work of the device of the described power level that retunes.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US88080892A | 1992-05-08 | 1992-05-08 | |
| US880,808 | 1992-05-08 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1082786A true CN1082786A (en) | 1994-02-23 |
| CN1035588C CN1035588C (en) | 1997-08-06 |
Family
ID=25377146
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN93105681A Expired - Lifetime CN1035588C (en) | 1992-05-08 | 1993-05-07 | Method and circuit for selecting tuning of a radio receiver |
Country Status (11)
| Country | Link |
|---|---|
| JP (1) | JP3196211B2 (en) |
| CN (1) | CN1035588C (en) |
| CA (1) | CA2112809A1 (en) |
| DE (2) | DE4392213T1 (en) |
| FR (1) | FR2691027B1 (en) |
| GB (1) | GB2274750B (en) |
| HU (1) | HUT69370A (en) |
| IT (1) | IT1261466B (en) |
| RU (1) | RU2123771C1 (en) |
| SE (1) | SE9400018L (en) |
| WO (1) | WO1993023963A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1866759B (en) * | 2005-05-16 | 2012-07-04 | 冲电气工业株式会社 | Radio communication method and equipment |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07508392A (en) * | 1993-04-21 | 1995-09-14 | モトローラ・インコーポレーテッド | Method and circuit for radio receiver retuning |
| FR2726139A1 (en) * | 1994-10-19 | 1996-04-26 | Philips Electronics Nv | RADIO RECEIVER WITH AUTOMATIC STATION SEARCH |
| EP0714217B1 (en) * | 1994-11-22 | 2005-07-27 | Ntt Mobile Communications Network Inc. | Method for searching a control channel in a mobile station |
| US5940746A (en) * | 1995-12-29 | 1999-08-17 | Motorola, Inc. | Channel scanning apparatus and method |
| JP3271504B2 (en) * | 1996-02-02 | 2002-04-02 | 三菱電機株式会社 | Frequency estimation circuit and AFC circuit using the same |
| GB2320991A (en) * | 1996-12-20 | 1998-07-08 | Dsc Telecom Lp | Channel selection control in a cellular radio communications system |
| EP0983701A2 (en) * | 1997-04-14 | 2000-03-08 | Nortel Networks Limited | Method and system for avoiding communication failure in cdma systems |
| US6233247B1 (en) | 1998-03-12 | 2001-05-15 | Nortel Networks Limited | Method and system for avoiding communication failure in CDMA systems |
| US6396867B1 (en) | 1997-04-25 | 2002-05-28 | Qualcomm Incorporated | Method and apparatus for forward link power control |
| GB2332823A (en) * | 1997-12-29 | 1999-06-30 | Samsung Electronics Co Ltd | Sequential selection of control channels for call attempt |
| GB9925234D0 (en) * | 1999-10-25 | 1999-12-22 | Simoco Int Ltd | Mobile radio communications systems |
| KR100374568B1 (en) * | 2001-01-17 | 2003-03-03 | 삼성전자주식회사 | Power off control method for mobile station |
| EP1482747B1 (en) * | 2003-05-28 | 2006-10-11 | Telefonaktiebolaget LM Ericsson (publ) | Cell search scheduling in a wireless cellular communication network |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2087369A5 (en) * | 1970-05-15 | 1971-12-31 | Cit Alcatel | |
| 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 |
| GB2057267B (en) * | 1979-08-29 | 1983-05-18 | Allcock J A | Sensory isolation tank |
| FR2584884B1 (en) * | 1985-07-09 | 1987-10-09 | Trt Telecom Radio Electr | FREE CHANNEL SEARCHING METHOD AND DEVICE FOR A MOBILE RADIO SYSTEM |
| CH671124A5 (en) * | 1986-04-30 | 1989-07-31 | Zellweger Uster Ag | |
| 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 |
| FI83715C (en) * | 1989-09-25 | 1991-08-12 | Nokia Mobile Phones Ltd | LOGIKSTYRD INTRIMNING OCH KOMPENSATION AV SIGNALNIVAOER OCH DEVIATIONER I EN RADIOTELEFON. |
| FI83717C (en) * | 1989-09-25 | 1991-08-12 | Nokia Mobile Phones Ltd | Procedure for tuning and compensating power levels in a radiophone |
| JP2867538B2 (en) * | 1990-01-30 | 1999-03-08 | 日本電気株式会社 | Channel selection method |
| US5119502A (en) * | 1990-08-30 | 1992-06-02 | Telefonaktiebolaget L M Ericsson | Periodic system ordered rescan in a cellular communication system |
| JP2927055B2 (en) * | 1991-07-12 | 1999-07-28 | 日本電気株式会社 | Control channel acquisition method and circuit |
| US5203012A (en) * | 1992-02-10 | 1993-04-13 | Motorola, Inc. | Method and apparatus for optimum channel assignment |
-
1993
- 1993-04-19 JP JP52023493A patent/JP3196211B2/en not_active Expired - Lifetime
- 1993-04-19 CA CA002112809A patent/CA2112809A1/en not_active Abandoned
- 1993-04-19 WO PCT/US1993/003692 patent/WO1993023963A1/en active Application Filing
- 1993-04-19 RU RU94014617A patent/RU2123771C1/en active
- 1993-04-19 HU HU9400043A patent/HUT69370A/en unknown
- 1993-04-19 DE DE4392213T patent/DE4392213T1/en active Pending
- 1993-04-19 DE DE4392213A patent/DE4392213C2/en not_active Expired - Fee Related
- 1993-04-19 GB GB9326218A patent/GB2274750B/en not_active Expired - Lifetime
- 1993-05-03 IT ITRM930277A patent/IT1261466B/en active IP Right Grant
- 1993-05-07 FR FR9305496A patent/FR2691027B1/en not_active Expired - Lifetime
- 1993-05-07 CN CN93105681A patent/CN1035588C/en not_active Expired - Lifetime
-
1994
- 1994-01-04 SE SE9400018A patent/SE9400018L/en not_active Application Discontinuation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1866759B (en) * | 2005-05-16 | 2012-07-04 | 冲电气工业株式会社 | Radio communication method and equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| IT1261466B (en) | 1996-05-23 |
| HUT69370A (en) | 1995-09-28 |
| CN1035588C (en) | 1997-08-06 |
| ITRM930277A0 (en) | 1993-05-03 |
| DE4392213C2 (en) | 1999-04-29 |
| JP3196211B2 (en) | 2001-08-06 |
| HU9400043D0 (en) | 1994-05-30 |
| CA2112809A1 (en) | 1993-11-25 |
| FR2691027A1 (en) | 1993-11-12 |
| ITRM930277A1 (en) | 1994-11-03 |
| SE9400018L (en) | 1994-03-07 |
| GB9326218D0 (en) | 1994-04-20 |
| DE4392213T1 (en) | 1994-06-09 |
| JPH06508973A (en) | 1994-10-06 |
| GB2274750A (en) | 1994-08-03 |
| SE9400018D0 (en) | 1994-01-04 |
| FR2691027B1 (en) | 1995-08-11 |
| GB2274750B (en) | 1996-06-12 |
| RU2123771C1 (en) | 1998-12-20 |
| WO1993023963A1 (en) | 1993-11-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1082786A (en) | The Method and circuits of radio receiver selecting tuning | |
| CN1199506C (en) | Random access control method and system | |
| CN1095307C (en) | Methods and systems for allocating a cellular communications channel for communication between a cellular terminal and a telephone base station using received signal strength measurements | |
| CN1090435C (en) | Radio personal communication system and method | |
| CN1053782C (en) | Digital control channel | |
| CN1146284C (en) | Method and system for channel allocation using power control and mobile-assisted handover measurements | |
| CN1134941C (en) | Multi-hop packet radio networks | |
| CN1149711C (en) | Adaptive array device | |
| CN1157014C (en) | CDMA transmission system | |
| CN1115806C (en) | Dual band portable phone switchable between different phone systems | |
| CN1235440A (en) | Method and apparatus for radio communication | |
| CN1874388A (en) | Method for automatically connecting a mobile communication terminal to a home network system | |
| CN1134996C (en) | Telephone apparatus | |
| CN1220789A (en) | Method and apparatus for cordless infrared communication | |
| CN1133669A (en) | Method and apparatus for reducing the average downlink transmitted power from base stations during soft handoff | |
| CN1533050A (en) | Base station device | |
| CN1574721A (en) | Radio signal communication method, base station and terminal station | |
| CN1235437A (en) | Broadcast information delivering system | |
| CN1493118A (en) | Power control for downlink shared channel in radio access telecommunications network | |
| CN1075237A (en) | Public frequency in a plurality of radio telephone systems | |
| CN1256602A (en) | Data grouping multiplex insertion communication method and emitting and receiving apparatus thereof | |
| CN1905399A (en) | Method and system for implementing 2G network electric regulating antenna central control | |
| CN1354926A (en) | Method of and equipment for performing radio communication environments | |
| CN1574682A (en) | Antenna diversity transceiver and method of switching reception antenna | |
| CN1170375C (en) | Rodio communication device and radio communication method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: MOTOROLA MOBILE CO., LTD. Free format text: FORMER OWNER: MOTOROLA INC. Effective date: 20101230 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20101230 Address after: Illinois Instrunment Patentee after: Motorola Mobility LLC Address before: Illinois Patentee before: Motorola Inc. |
|
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20130507 Granted publication date: 19970806 |