CN1479550A - Mobile commmunication terminal - Google Patents
Mobile commmunication terminal Download PDFInfo
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- CN1479550A CN1479550A CNA031365159A CN03136515A CN1479550A CN 1479550 A CN1479550 A CN 1479550A CN A031365159 A CNA031365159 A CN A031365159A CN 03136515 A CN03136515 A CN 03136515A CN 1479550 A CN1479550 A CN 1479550A
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Abstract
The mobile communication terminal possesses the reception electric field level measuring set for measuring the reception electric field level of signal received from wireless base station, as well as the terminal speed measuring set for measuring speed between the mobile communication terminal and the said wireless base station. Based on the speed and reception electric field level measured, the control device controls switching wireless communication lines.
Description
Patent application of the present invention is that number of patent application is the dividing an application of female case application of No.98808725.1, and the international application no of this mother's case is PCT/JP98/02943, and international filing date is on June 30th, 1998.
Technical field
The mobile communication terminal that the present invention relates to use in the mobile communication system, particularly, relate at mobile communication terminal (travelling carriage) when the base station cell of the wireless base station of communicating by letter moves to the base station cell of other wireless base station, replenish the switching controls that the talk channel of the base station cell that moves the side is proceeded to communicate by letter.
Background technology
In mobile communication system, when moving to the base station cell of adjacent wireless base station with the base station cell of the wireless base station of mobile communication terminal from communicate by letter during the wireless base station communicates, need switch on this base station cell border in order to proceed communication, replenish the talk channel of its contiguous wireless base station.
The 1st figure is illustrated in the Japanese kokai publication hei 9-37327 communique and discloses, the key diagram of the summary of this switching controls in the mobile communication system in the past.Among the figure, 1a, 1b, 1c are the wireless base stations, and 2a, 2b, 2c are the base station cells that is covered by these each wireless base station 1a, 1b, 1c, the 3rd, in these base station cells 2a, 2b, 2c, move forward into the mobile communication terminal of row communication.
Next illustrates its action.
Here, the 2nd figure is the flow chart that above-mentioned switching controls handling process is shown.Mobile communication terminal 3 at first carries out the reception incoming level of the signal that the wireless base station 1a from conversation receives or the mensuration (step ST1) of communication quality (error rate, frame error rate etc.).Secondly, judge that it receives incoming level or whether communication quality is predetermined value above (step ST2), turn back to step ST1 if then make more than the predetermined value to handle, on the other hand, if discontented predetermined value is then carried out the reception incoming level of the control signal that sends from other wireless base station 1b, 1c or the mensuration (step ST3) of communication quality.
Secondly, be wireless base station more than the predetermined value for the reception incoming level of its control signal or communication quality, carry out the detection (step ST4) of its change tendency (be in rising trend or be in the tendency that descends).Secondly, judge whether have the reception incoming level of its control signal or the wireless base station (step ST5) that communication quality is in rising trend.If have the wireless base station that is in rising trend, judge then whether the quantity of the wireless base station that it is in rising trend is a plurality of (step ST6).
The result who measures only has one if be in the wireless base station of rising trend, then switches to its base station cell that is in the wireless base station of rising trend (step ST7).The 1st figure (a) illustrates its situation, in the illustrated case, switches to the base station cell 2c of wireless base station 1c.In addition, if there are a plurality of wireless base stations that are in rising trend, then switch to the base station cell (step ST8) of the minimum wireless base station of the reception incoming level of control signal wherein or communication quality.The 1st figure (b) illustrates its situation, in illustrated example, switches to the base station cell 2c of wireless base station 1c.
In above-mentioned step ST5, be judged to be when not having the wireless base station that is in rising trend, switch to the base station cell (step ST9) of the highest wireless base station of the incoming level of control signal or communication quality.The 1st figure (c) illustrates its situation, in illustrated example, switches to the base station cell 2c of wireless base station 1c.
In addition, as other file with the switching controls in the relevant this mobile communication system of record, Japanese kokai publication hei 6-292258 communique etc. is arranged, this bulletin discloses and makes mobile communication terminal have the function of the data that generate the error rate (BER:Bit Error Rate) that is used to measure received signal, simultaneously, the wireless base station is had receive the function of above-mentioned its error rate BER of data determination, switch to the technology of the base station cell of the little wireless base station of the error rate BER of these data.
Here, known generally between wireless base station and mobile communication terminal because diffraction, reflection etc. exist many transmission paths, observe multipath fading.Under such environment, receive incoming level and shown in the 3rd figure, present rayleigh distributed like that.For eliminate based on the decline influence, often the time average of instantaneous measurement value as incoming level.Yet as shown in Figure 3 because rayleigh distributed is the function of distance, so the change of instantaneous measurement value is according to the mobile status (speed, direction) of mobile communication terminal and difference is difficult to eliminate the influence that declines by time average.
Therefore, even mobile communication terminal during near the wireless base station, because the decay that above-mentioned decline causes receives incoming level or communication quality and worsen, but when mobile communication terminal during away from the wireless base station, reception incoming level or communication quality improve on the contrary.
When having carried the mobile device high-speed mobile of mobile communication terminal, in order also to follow the tracks of at high speed, need to shorten the needed time of smoothing for the variation that receives incoming level or circuit quality, improve time precision.In addition, when mobile device low speed moves or is in accurate inactive state, need the required time of lengthening smoothing to improve the precision of measured value.This is in order to prevent that repeatedly starting is switched owing to the dispersiveness that receives incoming level or circuit quality etc. at the cell boarder of base station cell.Yet, do not detect the device of the translational speed of mobile device in the mobile communication terminal in the past.
In addition, if the object that moves observation electric wave then because Doppler effect is compared during with observation in stationary system, knownly will observe frequency displacement.At this moment Guan Ce frequency f
0Be expressed as.
f
0＝f-k·v (1)
Here, f is that v is the velocity of object in the frequency of accurate stationary system observation, and k is the wave-number vector of electric wave.
In such mobile communication system, the clock of mobile communication terminal is owing to the clock for the wireless base station has deviation, so mobile communication terminal need arrive the frequency pulling of receiver the frequency of wireless base station in order to receive the electric wave of wireless base station.At this moment among Guan Ce the difference on the frequency Δ f, be shown below like that, comprise the deviation f of clock
OffsetWith these two parts of the frequency displacement that causes by Doppler effect.
Δf＝f
offset-k·v (2)
Here, in the tdma communication mode, the time slot of the mobile communication terminal allocate communications in each communication.Distribute to the time slot of a plurality of mobile communication terminals because propagation delay is not overlapping in the wireless base station, therefore the wireless base station specifies indication to send the regularly timing adjustment (Time Alignment) of change for mobile communication terminal, and the careful transmission of control mobile communication terminal regularly.That is mobile communication terminal, far away apart from the wireless base station begins to send with leading timing than the mobile communication terminal near apart from the wireless base station.
In mobile communication terminal, regularly be benchmark with the reception of base station data, to begin to send with the leading timing of regularly adjusting appointment.Thereby, can detect distance with the wireless base station according to receiving regularly and send difference regularly.The order change is regularly adjusted in the moving process, regularly adjusts hardly to change under accurate stationary system.
In addition, for the electric field ratio Eb/N of every bit of noise
0And has the relation shown in the 4th figure between the error rate BER.This relation is by the performance decision of receiver, not with environmental change.Therefore, even receive the big signal of electric field level, when included therein noise is big, electric field ratio Eb/N
0Also reduce, and error rate BER strengthens.
In addition, circuit quality can enough error rates represent that roughly in mobile communication system, owing to be difficult to measure accurately error rate BER, the therefore use receives electric field level more.Yet, in this case, even it is big to receive electric field level as mentioned above, if but it is big for disturbing wave and noise ratio, and the device that does not have the translational speed that detects mobile device, then be difficult to adjust the time of smoothing, be difficult to prevent repeatedly start switching according to the translational speed of the mobile device that has carried mobile communication terminal.In addition, when expression has been used the reception electric field level aspect the circuit quality, receive electric field level even strengthen, if but interference wave and noise ratio it is big, then signal to noise ratio reduces, and under these circumstances, exists the problem that circuit quality worsens on the contrary.
Summary of the invention
The present invention produces for solving above-mentioned problem, purpose is to obtain to have by also select best base station cell under fading environment, reduce the switching controls number of times as far as possible, can suppress the mobile communication terminal of method for handover control of the traffic of the deterioration of service quality and control signal.
The present invention is provided with the reception electric field level determinator of mensuration from the reception electric field level of the received signal of wireless base station, simultaneously, setting is from the error rate determinator of the data determination error rate that its received signal deciphered, and then, in receiving the electric field level correcting device, use its error rate to receive the correction of electric field level, carry out the switching controls of wireless communication line according to the reception electric field level that is corrected.Thus, improve with switch after the communication quality of communicating by letter of wireless base station, in addition, can also reduce starting continuously and switch, suppress to control the traffic.
In addition, the present invention is provided with the known mode comparison means, used the detection that is present in the number of bit errors that receives the known mode data division in the data, simultaneously, error correcting/decoding apparatus is set, the bit number of the mistake that receives the user's data division in the data has been corrected in detection, according to detected number of bit errors and the bit number that has been repaired, measures the error rate of received signal in the above-mentioned error rate determinator.
In addition, the present invention is provided with and receives the electric field level determinator, mensuration is from the reception electric field level of the received signal of wireless base station, simultaneously, the terminal velocity determinator is set, measure the translational speed of this mobile communication terminal, carry out the switching controls of wireless communication line according to determined translational speed and reception electric field level for the wireless base station.Thus, improve the communication quality of communicating by letter, can reduce starting continuously simultaneously and switch, prevent to control the traffic and increase with the wireless base station after the switching.
In addition, the present invention is provided with and receives the electric field level prediction unit, according to the reception electric field level that receives the received signal that the electric field level determinator measures with the mobile communication terminal of terminal velocity determinator mensuration translational speed for the wireless base station, prediction back one reception electric field level constantly uses the reception electric field level of its prediction to carry out the switching controls of wireless communication line.Thus, can easily carry out the big wireless base station of reception electric field level of prediction is chosen as the switching controls of the wireless base station of switching target.
In addition, the present invention is provided with the Doppler frequency checkout gear, detect Doppler frequency from the received signal from the wireless base station, the terminal velocity determinator uses its Doppler frequency that is detected, and carries out the mensuration of this mobile communication terminal for the translational speed of wireless base station.Here, be under the positive situation by the detected Doppler frequency of this Doppler frequency checkout gear, mobile communication terminal is near the wireless base station, for mobile communication terminal under the negative situation away from the wireless base station.In addition, its absolute value is with proportional for the translational speed of transmission direction.Thus, the influence observation Doppler frequency that can not declined can detect mobile communication terminal accurately near the wireless base station.
In addition, the present invention calculates this mobile communication terminal of Doppler frequency when asking to(for) the translational speed of wireless base station from the difference on the frequency from the clock frequency of the receive frequency of wireless base station and this mobile communication terminal self by automatic frequency control apparatus traction.
In addition, the present invention is provided with the propagation delay checkout gear, detect the propagation delay between this mobile communication terminal and the wireless base station, measure distance between wireless base station and this mobile communication terminal with measuring device between mobile communication terminal-wireless base station from the propagation delay that is detected simultaneously, the terminal velocity determinator carries out the mensuration of this mobile communication terminal for the translational speed of wireless base station from the time fluctuation of the distance of its wireless base station and this wireless communication terminal.Thus, improve with switch after the communication quality of communicating by letter of wireless base station, also can reduce starting continuously simultaneously and switch, prevent to control traffic increase.
In addition, the present invention is provided with regularly comparison means of transmitting-receiving, detect its timing difference regularly regularly comparing, measure the distance of wireless base station and mobile communication terminal according to detected timing difference with reception from the received signal of wireless base station from the transmission of wireless base station indication.Thus, the influence that detected mobile communication terminal and the distance between the wireless base station can not declined and produce detects mobile communication terminal accurately near the wireless base station.
Description of drawings
The 1st figure is the key diagram that the switching controls summary in the mobile communication system is shown.
The 2nd figure is the flow chart of the switching controls handling process in the mobile communication terminal that illustrates in the past.
The 3rd figure illustrates because the key diagram of the distance change of the electric field strength that decline causes
The 4th figure be noise that every bit is shown/signal power than with the key diagram that concerns an example of the error rate.
The 5th figure is the block diagram that the mobile communication terminal of the invention process form 1 is shown.
The 6th figure is the flow chart that the hand-off process flow process in the above-mentioned example 1 is shown.
The 7th figure is the block diagram that the mobile communication terminal of the invention process form 2 is shown.
The 8th figure is the flow chart that the switching controls handling process in the above-mentioned example 2 is shown.
The 9th figure is the flow chart that the detailed process of the prediction processing in the above-mentioned switching controls processing is shown.
The 10th figure is the block diagram that the mobile communication terminal of the invention process form 3 is shown.
The 11st figure is the flow chart that the switching controls handling process in the above-mentioned example 3 is shown.
Embodiment
Below, in order to illustrate in greater detail the present invention, explanation is used to implement optimal morphology of the present invention with reference to the accompanying drawings.Example 1
The 5th figure is the mount structure that desirable mobile communication terminal of the present invention is shown.Among the figure, 1a, 1b, 1c are the wireless base stations, the 3rd, and the mobile communication terminal that in the base station cell that covers with these wireless base stations 1a, 1b, 1c, moves, these are to have marked same-sign and suitable in the past part in the 1st figure.
In addition, the 11st, the frequency of setting received signal receives the signal from wireless base station 1a, wireless base station 1b, wireless base station 1c, and they are carried out the receiving system of detection.The 12nd, by receiving system 11 detections the received signal demodulating equipment that carries out demodulation, the 13rd, by these demodulating equipment 12 demodulation the reception data be divided into the demultiplexer of known mode data division and user data part.The 14th, the base station mode data division in the reception data of having separated with this demultiplexer 13 and the known mode of storage are compared, detect the known mode comparison means of the number of bit errors in the known mode data division.The 15th, correct the included mistake of user data part in the reception data of having separated with demultiplexer 13, count the error correcting/decoding apparatus of the bit number of having corrected.
The 16th, the bit number that has been repaired from the user data part of having corrected by number of bit errors the known mode comparison means 14 detected known mode data divisions with by error correcting/decoding apparatus 15 calculates the error rate determinator of the error rate.The 17th, measure with receiving system 11 receive, detection the reception electric field level determinator of reception electric field level of received signal.The 18th, the reception electric field level correcting device that the reception electric field level of having been measured by this reception electric field level determinator 17 is revised by the error rate of being calculated by error rate determinator 16.The 19th, according to the reception electric field level of having revised by this receptions electric field level correcting device 18, start the control device of the switching of wireless communication line.
Above-mentioned mobile communication terminal 3 is formed by these receiving systems 11, demodulating equipment 12, demultiplexer 13, known mode comparison means 14, error correcting/decoding apparatus 15, error rate determinator 16, reception electric field level determinator 17, reception electric field level correcting device 18, control device 19 etc.
Next illustrates its action.
Here, the 6th figure is the flow chart that the hand-off process flow process in the mobile communication terminal 3 of such formation is shown.In addition, overlapping with the base station cell of each wireless base station 1a, wireless base station 1b and wireless base station 1c covering at its cell boarder.In addition, when mobile communication terminal 3 and wireless base station 1a ongoing communication, also can accept from the wireless base station 1b beyond the wireless base station 1a in this communication, the control signal of wireless base station 1c.
In mobile communication terminal 3, its receive electric field level determinator 17 measure by receiving system 11 receive, detection the reception electric field level (step ST11) from the received signal of the wireless base station 1a in the current communication.Secondly, judge whether the value of the reception electric field level of having measured with this receptions electric field level determinator 17 is (step ST12) more than the predetermined value, if then make processing turn back to step ST11 more than the predetermined value.In addition, when receiving the discontented predetermined value of electric field level, measure the reception electric field level (step ST13) that receives by receiving system 11 from the control signal of wireless base station 1b, wireless base station 1c with receiving electric field level determinator 17.
On the other hand, the demodulating equipment 12 of mobile communication terminal 3 receive by receiving system 11, detection received signal carry out demodulation, demultiplexer 13 by by demodulating equipment 12 demodulation the signal known mode data division that is divided into the user data part and comprises in order to detect the error rate.Known mode comparison means 14 compares the known mode of the data of the known mode data division that is separated by this demultiplexer 13 with storage in advance, detects the number of bit errors (step ST14) in the known mode data division.
In addition, the error-correcting decoding of data in the user data part that error correcting/decoding apparatus 15 carries out being separated by demultiplexer 13 detects the bit number (step ST15) that at this moment has been repaired.Error rate determinator 16 is according to calculating the error rate (step ST16) by the number of bit errors in the known mode comparison means 14 detected known mode data divisions with by the bit number that has been repaired in the error correcting/decoding apparatus 15 detected user data.
Secondly, receiving electric field level correcting device 18 uses each error rate correction of being calculated by error rate determinator 16 by the reception electric field level (step ST17) from the control signal of wireless base station 1b and wireless base station 1c that receives that electric field level determinator 17 measured.Secondly, whether the value of carrying out the reception electric field level revised with this receptions electric field level correcting device 18 is the judgement (step ST18) more than the predetermined value, if discontented predetermined value then make the processing turn back to step ST11.In addition, be predetermined value when above in the reception electric field level that has been corrected, the control device 19 of mobile communication terminal 3 selects this reception electric field level of having revised to be the highest wireless base station (for example wireless base station 1c), the wireless base station 1a report in communication.According to this report, (step ST19) switched in starting between wireless base station 1a in mobile communication terminal 3, communication and the selecteed wireless base station 1c.
Like this, in example 1 of the present invention, when existing a plurality of conducts to switch the base station cell of object, measure the reception electric field level of each wireless base station, simultaneously, be present in the bit number that has been repaired that receives in number of bit errors that the known mode data in the data obtain and the user data according to utilization and calculate the error rate that received signal is separated timing, by with the reception electric field level of this error rate correction from the control signal of each wireless base station, the wireless base station of selection switching target.Thus, can prevent to switch to the disturbing wave that on received signal, superposes, though receive the low wireless base station of the high signal to noise ratio of electric field level, the deterioration of the communication quality after can preventing to switch.Like this, the deterioration by the communication quality after preventing to switch can reduce switching times, therefore can prevent owing to switch the instantaneous disconnection of communication that produces and the traffic increase of control signal.Example 2
The 7th illustrates the mount structure of the of the present invention desirable mobile communication terminal different with the example 1 shown in the 5th figure, the symbol that mark is identical with above-mentioned the 5th figure on suitable part and omit its explanation.
Among the figure, 21 be to use by receiving system 11 receive, detection the received signal automatic frequency control apparatus that carries out the traction of receive frequency.The 22nd, from by the receive frequency of this automatic frequency control apparatus 21 tractions and the Doppler frequency checkout gear of the difference on the frequency detection Doppler frequency of the clock frequency of this mobile communication terminal 3.The 23rd, according to by these Doppler frequency checkout gear 22 detected Doppler frequencies, measure the terminal velocity determinator of mobile communication terminal 3 for the translational speed of the wireless base station 1a in the communication.The 24th, from signal electric field level and the translational speed of the mobile communication terminal of being measured by terminal velocity determinator 23 3 for wireless base station 1a by the received signal that is received by receiving system 11 that receives that electric field level determinator 17 measures, (for example t is after second constantly in prediction back one; T is variable) the reception electric field level, and send the reception electric field level prediction unit of control device 19 to.
Next illustrates its action.
Here, the 8th figure is the flow chart that the hand-off process flow process in the mobile communication terminal 3 of such formation is shown.In addition, overlapping with each base station cell that each wireless base station 1a, wireless base station 1b and wireless base station 1c cover at its cell boarder, when mobile communication terminal 3 communicates with wireless base station 1a, also can accept from the control signal this point of wireless base station 1b, wireless base station 1c beyond the wireless base station 1a in the communication identical with the situation of above-mentioned example 1.
The reception electric field level determinator 17 of mobile communication terminal 3 measure by receiving system 11 receive, detection the reception electric field level (step ST21) from the received signal of the wireless base station 1a in the communication.Secondly, whether the value of carrying out the reception electric field level measured by this receptions electric field level determinator 17 is the judgement (step ST22) more than the predetermined value, if then make processing turn back to step ST21 more than the predetermined value.In addition, when receiving the discontented predetermined value of electric field level, in receiving electric field level determinator 17, measure the reception electric field level (step ST23) that receives by receiving system 11 from the control signal of wireless base station 1b, wireless base station 1c.
Secondly, carrying out by the reception electric field level that this receptions electric field level determinator 17 is measured is that wireless base station more than the predetermined value has several judgement (step ST24), if one all not then make processing turn back to step ST21.In addition, be wireless base station more than the predetermined value when having only receiving electric field level, its wireless base station is chosen as the wireless base station (step ST25) of switching target.In addition, be that wireless base station more than the predetermined value exists when a plurality of receiving electric field level, carry out the traction (step ST26) of the receive frequency of each wireless base station by automatic frequency control apparatus 21.Secondly, Doppler frequency checkout gear 22 uses the difference on the frequency by the clock of the clock of the receive frequency of these automatic frequency control apparatus 21 tractions and this mobile communication terminal 3 self, and measuring for those reception electric field level is the Doppler frequency (step ST27) of the wireless base station more than the predetermined value.
Secondly, judge that it is positive wireless base station (step ST28) that the Doppler frequency of not measured by its Doppler frequency checkout gear 22 is arranged, if not having Doppler frequency is positive wireless base station, then among the program RT1 that describes in detail in the back, carry out based on the reception electric field level prediction that receives electric field prediction section 24.In addition, be positive wireless base station if there is Doppler frequency, then carrying out this Doppler frequency is whether positive wireless base station has a plurality of judgement (step ST29).Its result has only one if Doppler frequency is positive wireless base station, then this wireless base station is chosen as the wireless base station (step ST25) of switching target.On the other hand, a plurality of if Doppler frequency is that positive wireless base station has, then from the candidate, removed Doppler frequency for negative wireless base station after (step ST30), carry out prediction processing based on the reception electric field level of program RT1.
The prediction processing of the reception electric field level of being undertaken by program RT1 is described here.The 9th figure is the flow chart that the prediction processing flow process of the reception electric field level of being undertaken by this program RT1 is shown.The terminal velocity determinator 23 of mobile communication terminal 3 is measured the translational speed (step ST41) of mobile communication terminal 3 for this wireless base station from becoming the Doppler frequency of candidate wireless base station.Secondly, receive electric field level prediction unit 24 from the reception electric field level of the wireless base station that becomes the candidate and mobile communication terminal 3 translational speed for this wireless base station, prediction back one is the reception electric field level (step ST42) of (t is after second) constantly.And, be its predicted reception electric field level after maximum wireless base station (for example wireless base station 1c) is chosen as the wireless base station (step ST43) of switching target, withdraw from the prediction processing (program RT1) of this reception electric field level.
If withdrawed from the prediction processing of the reception electric field level of being undertaken by this program RT1, then the wireless base station 1a of the control device 19 of mobile communication terminal 3 in communication reports its selecteed wireless base station 1c.According to this report, (step ST31) switched in starting between wireless base station 1a in mobile communication terminal 3, communication and the selecteed wireless base station 1c.
Here, for just representing mobile communication terminal 3 near the wireless base station, detected Doppler frequency is that negative indication mobile communication terminal 3 is away from the wireless base station with Doppler frequency checkout gear 22 detected Doppler frequencies.In addition, the absolute value of detected Doppler frequency and mobile communication terminal 3 are proportional for the translational speed of the direction of propagation.Owing to can not be subjected to observe this Doppler frequency, therefore can detect mobile communication terminal approaching to the wireless base station accurately by the influence that decline produces.
Like this, in example 2 of the present invention, exist a plurality of when becoming the base station cell that switches object, detect the Doppler frequency of each wireless base station, measure the translational speed of mobile communication terminal from this Doppler frequency for each wireless base station, from its translational speed with from the reception electric field level of the signal of each wireless base station, prediction back one is the reception electric field level of (t is after second) constantly, thus, in the process of mobile communication terminal, be predicted reception electric field level the highest base station selected wireless base station of switching target that is near the wireless base station.Thus, increased the distance that in same base station cell, can move, reduced switching times, therefore can prevent owing to switch the instantaneous interruption of the communication that causes and the traffic increase of control signal.In addition, measure the translational speed of mobile communication terminal according to Doppler frequency, so the influence that is difficult to be declined, mobile communication terminal can be detected accurately near the wireless base station.Example 3
The 10th illustrates the mount structure of the of the present invention desirable mobile communication terminal different with the example 2 shown in example 1 shown in the 5th figure and the 7th figure, the symbol that mark is identical with above-mentioned the 7th figure on suitable part and omit its explanation.
Among the figure, the 31st, by demodulating equipment 12 demodulation received signal decipher, extract from the wireless base station code translator to the control data of mobile communication terminal 3.The 32nd, according to the instruction from the wireless base station that is included in the control data that is extracted by this code translator 31, the transmission transmission regularly of change mobile communication terminal 3 is change device regularly.The 33rd, the data that send are modulated the dispensing device that regularly sends by the transmission of these transmissions timing change device 32 appointments.The 34th, detect the propagation delay checkout gear of propagation delay between this mobile communication terminal and the wireless base station, in this example 3, use regularly regularly being compared with the reception from the received signal of wireless base station by the transmission that sends regularly the mobile communication terminal 3 of change device 32 appointments, the transceiver that detects its timing difference is comparison means regularly.
The 35th, from by as the transceiver of this propagation delay checkout gear regularly the reception measured of comparison means 34 measure between the mobile communication terminal-wireless base station of the distance between this mobile communication terminal 3 and the wireless base station apart from determinator regularly for sending timing difference regularly.The 36th, storage by the mensuration of the time fluctuation of mobile communication terminal of measuring apart from determinator 35 between this mobile communication terminal-wireless base station 3 and the distance between the wireless base station apart from storage device.
In addition, terminal velocity determinator 23 is according to being stored in the time fluctuation of this mensurations apart from the distance between mobile communication terminal in the storage device 36 3 and the wireless base station, and it is different with part mark the example 2 that same-sign represents in the 7th figure in for the mensuration this point of the translational speed of wireless base station to carry out mobile communication terminal 3.
Next illustrates its action.
Here, the 11st figure is the flow chart that the hand-off process flow process in the mobile communication terminal 3 of such formation is shown.In addition, overlapping with each base band sub-district that each wireless base station 1a, wireless base station 1b and wireless base station 1c cover at its cell boarder, when mobile communication terminal 3 communicates with wireless base station 1a, also can receive from the wireless base station 1b beyond the wireless base station 1a in the communication, the control signal of wireless base station 1c, this point is identical with the situation of above-mentioned example 1 and example 2.
In addition, the decoding of the signal that the code translator 31 of mobile communication terminal 3 has carried out by demodulating equipment 12 demodulation is reported to sending regularly change device 32 when comprising the control data from the wireless base station in decoded data.Send regularly change device 32 and comprise in decoded control data when sending regularly alteration command, according to the instruction that the transmission that is comprised in the control data from this wireless base station is regularly changed, the transmission of setting the data of being undertaken by dispensing device 33 regularly.
The reception electric field level determinator 17 of mobile communication terminal 3 measure by receiving system 11 receive, detection the reception electric field level (step ST51) from the received signal of the wireless base station 1a in the communication.Secondly, whether the value of carrying out the reception electric field level measured with this receptions electric field level determinator 17 is the judgement (step ST52) more than the predetermined value, if then make processing turn back to step ST41 more than the predetermined value.In addition, when receiving the discontented predetermined value of electric field level, the reception electric field level (step ST53) of measuring in receiving electric field level determinator 17 that receiving system 11 receives from the control signal of wireless base station 1b, wireless base station 1c.
Secondly, carrying out by the reception electric field level that this receptions electric field level determinator 17 has been measured is that wireless base station more than the predetermined value has several judgement (step ST54), if one all not then make the processing turn back to step ST51.In addition, be wireless base station more than the predetermined value when having only receiving electric field level, this wireless base station is chosen as the wireless base station (step ST55) of switching target.In addition, receiving electric field level is that wireless base station more than the predetermined value exists when a plurality of, by transceiver regularly comparison means 34 detect its timing difference (step ST56) respectively regularly comparing with respect to regularly each wireless base station 1b of the transmission of mobile communication terminal 3, the reception of wireless base station 1c.
Secondly, according to timing differences with 34 detected transmission timings of transceiver timing comparison means and reception timing, measure the distance of mobile communication terminal 3 and each wireless base station 1b, wireless base station 1c respectively, with each preset time determined distance of (for example T second, T is variable) sampling and be stored in mensuration at interval apart from (step ST57) in the storage device 36.
Secondly, terminal velocity determinator 23 is read for each wireless base station 1b, wireless base station 1c and is stored in the time fluctuation of this mensuration apart from the distance between mobile communication terminal in the storage device 36 3 and the wireless base station, judges that the change tendency whether its time change (translational speed) is arranged is negative wireless base station (step ST58).Its result is not if there is above-mentioned change tendency to be negative wireless base station, then directly by receiving the prediction processing that electric field prediction section 24 is carried out based on the reception electric field level of program RT2.
Here, identical with program RT1 in the example 2 basically based on the prediction processing of the reception electric field level of this program RT2, according to the flow performing shown in the 9th figure.In addition, in this case, mobile communication terminal 3 among the step ST41 for the calculating of the translational speed of wireless base station according to be stored in mensuration apart from the storage device 36 as the time fluctuation of candidate wireless base station for the distance of mobile communication terminal 3, carried out by terminal velocity determinator 23, this point is different with the situation of example 2.
Judged result among the above-mentioned steps ST58, when existing the change tendency to be the wireless base station of bearing, carry out it and change whether the quantity of being inclined to negative wireless base station is a plurality of judgements (step ST59), if the change tendency then is chosen as this wireless base station the wireless base station (step ST55) of switching target for negative wireless base station has only one.On the other hand, if the change of the time fluctuation of distance (translational speed) tendency has a plurality of for negative wireless base station, the change tendency is (step ST60) after the positive wireless base station outside then removing from the candidate, carries out the prediction processing based on the reception electric field level of program RT2.
If withdrawed from the prediction processing based on the reception electric field level of this program RT2, then the wireless base station 1a of the control device 19 of mobile communication terminal 3 in communication reports selecteed wireless base station (for example wireless base station 1c).According to this report, (step ST61) switched in starting between wireless base station 1a in mobile communication terminal 3, communication and the selecteed wireless base station 1c.
The influence that can not declined here, observation transceiver regularly comparison means 34 be used for the transmission of this mobile communication terminal 3 regularly compared and the reception of the signal that receives from the wireless base station measured regularly.Thereby,, thereby can detect mobile communication terminal approaching to the wireless base station accurately by the influence that also can be difficult to be declined apart from the distance of determinator 35 detected mobile communication terminals and wireless base station between mobile communication terminal-wireless base station.
Like this, in example 3 of the present invention, exist when a plurality of becoming the base station cell that switches object, according to by the transmission of regulating from the instruction of wireless base station regularly with receive regularly poor, measure the translational speed of mobile communication terminal for each wireless base station, from its translational speed with from the received signal level of the signal of each wireless base station, prediction back one is the reception electric field level of (t is after second) constantly, thus, in the approaching wireless base station of mobile communication terminal, be the reception electric field level of prediction the highest base station selected wireless base station of switching target that is.Thus, be increased in the distance that can move in the same base station cell, reduce switching times, can prevent that therefore the instantaneous interruption and the control signal traffic of the communication that caused by switching from increasing.In addition, because the translational speed of mobile communication terminal is measured according to receiving regularly, therefore the influence that is difficult to be declined can detect mobile communication terminal accurately near the wireless base station.Utilizability on the industry
As described above, mobile communication terminal of the present invention is when switching, the error rate when measuring receiving signal demodulation with the reception electric field level of the signal of wireless base station, receiving the wireless base station that electric field level wireless base station big and that the error rate is low is chosen as switching target, the communication quality of the wireless base station after therefore improving and switching, reduce the situation that starting is continuously switched, can suppress to control the traffic, in addition, owing to the influence that also is difficult to be declined, can detect mobile communication terminal accurately near the wireless base station, very useful aspect the switching controls of the wireless base station that the change of the mobile communication terminal that therefore uses in mobile communication system communicates.
In addition, mobile communication terminal of the present invention is when switching, draw the receive frequency of wireless base station and measure the Doppler frequency of mobile communication terminal with the reception electric field level of the signal of wireless base station, calculate the translational speed of mobile communication terminal from this Doppler frequency for the wireless base station, from the translational speed of the mobile communication terminal that calculates and incoming level prediction back one reception electric field level constantly from the signal of wireless base station, thus prediction is received the wireless base station that the big wireless base station of electric field level is chosen as switching target, the communication quality of the wireless base station after therefore improving and switching, reduce the situation that starting is continuously switched, can suppress to control the traffic, in addition, owing to the influence that also is difficult to be declined, can detect mobile communication terminal accurately near the base station, very useful aspect the switching controls of the wireless base station that the change of the mobile communication terminal that therefore uses in mobile communication system communicates.
And then, mobile communication terminal of the present invention is when switching, measure propagation delay between mobile communication terminal and the wireless base station with the reception electric field level of the signal of wireless base station, ask the translational speed of mobile communication terminal from the time fluctuation of the distance of the mobile communication terminal that goes out according to its propagation delay calculation and wireless base station, according to the translational speed of its mobile communication terminal and reception electric field level prediction back one reception electric field level constantly from the signal of wireless base station, thus the big wireless base station of reception electric field level of prediction is chosen as the wireless base station of switching target, the communication quality of the wireless base station after therefore improving and switching, reduce the situation that starting is continuously switched, can suppress to control the traffic, very useful aspect the switching controls of the wireless base station that the change of the mobile communication terminal that uses in mobile communication system communicates, in addition, if regularly detect the distance of wireless base station and mobile communication terminal from the transmission of regulating according to the indication of wireless base station with the timing difference that receives timing, then owing to the influence that also is difficult to be declined, can detect mobile communication terminal accurately near the wireless base station, more useful aspect the switching controls of the wireless base station that the change of the mobile communication terminal that therefore uses in mobile communication system communicates.
Claims (6)
1. mobile communication terminal is characterized in that having:
The reception electric field level determinator of the reception electric field level of the signal that mensuration receives from the wireless base station;
Measure the terminal velocity determinator of this mobile communication terminal for the translational speed of above-mentioned wireless base station;
According to by the translational speed of above-mentioned terminal velocity determinator mensuration and the reception electric field level of measuring by above-mentioned reception electric field level determinator, control the control device of the switching of wireless communication line.
2. mobile communication terminal as claimed in claim 1 is characterized in that:
Be provided with according to by the translational speed of this mobile communication terminal that receives reception electric field level that the electric field level determinator measures and measure by the terminal velocity determinator for the wireless base station, the reception electric field level prediction unit of prediction back one reception electric field level constantly
Control device uses the reception electric field level by above-mentioned reception electric field level prediction unit prediction as the reception electric field level of the switching controls that is used to carry out wireless communication line.
3. mobile communication terminal as claimed in claim 1 is characterized in that:
Doppler frequency checkout gear according to the input Doppler frequency that receives from the wireless base station is set,
The terminal velocity determinator is from measuring the translational speed of this mobile communication terminal for the wireless base station by the detected Doppler frequency of above-mentioned Doppler frequency checkout gear.
4. mobile communication terminal as claimed in claim 3 is characterized in that:
The automatic frequency control apparatus of traction from the frequency of the signal of wireless base station reception is set,
The Doppler frequency checkout gear is from the difference on the frequency by frequency with the clock frequency of this mobile communication terminal of the traction of above-mentioned automatic frequency control apparatus, detection Doppler frequency.
5. mobile communication terminal as claimed in claim 1 is characterized in that being provided with:
Detect the propagation delay checkout gear of the propagation delay between this mobile communication terminal and the wireless base station;
From between the mobile communication terminal-wireless base station of the distance of measuring above-mentioned mobile communication terminal and wireless base station by the detected propagation delay of above-mentioned propagation delay checkout gear, measure device,
The terminal velocity determinator is from measuring the translational speed of this mobile communication terminal for the wireless base station by the time fluctuation of the distance of measuring mobile communication terminal that device measures and wireless base station between above-mentioned mobile communication terminal-wireless base station.
6. mobile communication terminal as claimed in claim 5 is characterized in that:
From the transmission of wireless base station indication regularly and the reception of the signal that receives from above-mentioned wireless base station regularly compare and detect its timing difference transceiver regularly comparison means be used as the propagation delay checkout gear that detects the propagation delay between this wireless communication terminal and the above-mentioned wireless base station.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA031365159A CN1479550A (en) | 1998-06-30 | 1998-06-30 | Mobile commmunication terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA031365159A CN1479550A (en) | 1998-06-30 | 1998-06-30 | Mobile commmunication terminal |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB988087251A Division CN1135867C (en) | 1998-06-30 | 1998-06-30 | Mobile communication terminal |
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| Publication Number | Publication Date |
|---|---|
| CN1479550A true CN1479550A (en) | 2004-03-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA031365159A Pending CN1479550A (en) | 1998-06-30 | 1998-06-30 | Mobile commmunication terminal |
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| Country | Link |
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| CN (1) | CN1479550A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108293219A (en) * | 2015-12-09 | 2018-07-17 | 瑞典爱立信有限公司 | Cell for air transport mobile cellular communication equipment selects |
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1998
- 1998-06-30 CN CNA031365159A patent/CN1479550A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108293219A (en) * | 2015-12-09 | 2018-07-17 | 瑞典爱立信有限公司 | Cell for air transport mobile cellular communication equipment selects |
| CN108293219B (en) * | 2015-12-09 | 2021-05-11 | 瑞典爱立信有限公司 | Cell selection for air-borne mobile cellular communication devices |
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