CN1273008A - Power control device and method for mobile communication system - Google Patents
Power control device and method for mobile communication system Download PDFInfo
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- CN1273008A CN1273008A CN99800887A CN99800887A CN1273008A CN 1273008 A CN1273008 A CN 1273008A CN 99800887 A CN99800887 A CN 99800887A CN 99800887 A CN99800887 A CN 99800887A CN 1273008 A CN1273008 A CN 1273008A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/38—TPC being performed in particular situations
- H04W52/42—TPC being performed in particular situations in systems with time, space, frequency or polarisation diversity
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/38—TPC being performed in particular situations
- H04W52/44—TPC being performed in particular situations in connection with interruption of transmission
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/54—Signalisation aspects of the TPC commands, e.g. frame structure
Abstract
A power control device for a mobile station in a CDMA communication system including a base station which transmits a traffic signal via one of at least two antennas and transmits a common channel signal via another antenna. The device comprises a receiver for receiving the transmitted traffic and common channel signals via one antenna; an interference power measurer for measuring power of an interference signal output from the receiver; a common channel power measurer for measuring power of the common channel signal output from the receiver; a traffic channel power measurer for measuring power of the traffic signal output from the receiver; a power control bit generator fo generating a power control bit for a traffic-OFF channel which has transmitted the common channel signal by operating the power of the pilot and interference signals; and a multiplexer for multiplexing the power control bit to a reverse link channel.
Description
Background of the present invention
1. field of the present invention
The present invention relates generally to a kind of output control device and method of mobile communication system, even relate in particular to a kind of output control device and the method that when Traffic Channel is cut off, still can control transmitted power.
2. association area is described
In order to carry out power control in mobile communication system, the recipient measures the intensity of the received signal that changes with the radio link standing state, and measurement result is sent to transmit leg.Then, transmit leg is according to the power that increases or reduce to send signal from recipient's power control instruction.In order to be controlled at the transmitted power of base station in this mobile communication system, moving table measuring signal interference ratio (SIR), itself and a threshold value are compared, producing power control bit (PCB), and provide the power control bit that is produced to the base station by backward channel.When receiving power control bit, the base station sends the power of signal according to the value of the power control bit that receives with specific step control.That is, for the forward link power in mobile communication system control, the power of the signal that moving table measuring is sent by the base station, and measurement result offered the base station.Then, the base station is according to control the power that sends signal from the power control information of travelling carriage.This method is called closed power control.
With reference to Fig. 1, what the figure shows is forward link power control procedure in the mobile communication system.Referring to Fig. 1, when base station (BS) sends signal (111), travelling carriage (MS) receives this signal (113) with a propagation delay.When receiving signal, the intensity of moving table measuring received signal, after this, according to measurement result transmission power control bit (115).Then, the base station receives this power control bit (117) with a propagation delay, and controls the power (119) that sends signal according to the power control bit that receives.As shown in Figure 1, in each unit that is defined as power control group (PCG), carry out power control, and the control of actual power is what to carry out with the delay of at least one power control group.
As mentioned above, carry out closed power control according to each power control group unit.The base station sends signal to travelling carriage, and then, the SIR of the signal that moving table measuring receives from the base station compares itself and a threshold value, and according to comparative result the power control bit that is produced sent to the base station.Then, this power control bit is analyzed in the base station, and controls the forward link transmit power of next power control group according to analysis result.This Poewr control method can be applicable to send continuously under the situation of Traffic Channel through individual antenna.In the method, according to the signal power that measures on the Traffic Channel, carry out service channel power control.
But to the particular channel structure of Traffic Channel connection/cut-out (ON/OFF), it is discontinuous that signal sends.This connection/cut-out is switched and for example can be appeared at the base station and have a plurality of antennas and come forward direction to send diversity or be used to carry out handover or support under the situation of discontinuous transmission (DXT).In this case, can not use above-mentioned close-loop power controlling method.
Therefore, when under the state of between base station and travelling carriage, set up calling out during connection/cut-out Traffic Channel, need control the transmitted power of Traffic Channel virtually, even when restarting to communicate by letter when Traffic Channel (, when connect) to cut off under the Traffic Channel starting power control immediately situation also be like this.
The present invention's general introduction
Therefore, an object of the present invention is to provide a kind ofly in mobile communication system, cut off (traffic-OFF) channel through business and send the apparatus and method that the specific instruction channel signal is controlled transmitted power.
Another object of the present invention provides a kind of in the CDMA mobile communication system of supporting the transmission diversity, controls call completion (traffic-ON) antenna and the professional apparatus and method of cutting off the transmitted power of antenna respectively.
Another purpose of the present invention provides a kind of in mobile communication system, measures the specific common channel signal power that receives from the base station at the travelling carriage place, with the apparatus and method of power controlling during handover.
A further object of the present invention provides in a kind of mobile communication system, locates to measure the specific common channel signal power that receives from transmit leg the recipient in discontinuous sending mode during non-transmission, with the apparatus and method of transmitted power of control transmit leg.
According to an aspect of the present invention, provide a kind of dispensing device of cdma base station, this base station comprises: at least two antennas; With a switch, be used for the spread spectrum service signal is switched to one of them antenna.This dispensing device comprises: adder, it is connected switch and does not send between the business cut-out antenna of spread spectrum service signal, is used for cutting off the specific common channel signal of antenna transmission through business.
According to a further aspect in the invention, provide the output control device of travelling carriage in a kind of cdma communication system, this communication system comprises the base station, and it sends service signal through one of at least two antennas, and through the specific common channel signal of another antenna transmission.This device comprises: receiver is used for receiving business and the common channel signal that sends through an antenna; The interference power measuring appliance is used to measure the power from the interference signal of receiver output; The public channel power measuring appliance is used to measure the power from the specific common channel signal of receiver output; The service channel power measuring appliance is used to measure the power from the service signal of receiver output; The power control bit generator is used for carrying out computing by the power to pilot tone and interference signal, produces the power control bit of the professional shutoff signal that sends specific common channel signal; And multiplexer, be used for the power control bit multipath conversion to reverse chain channel.
The accompanying drawing summary
With reference to the accompanying drawing detailed description of the present invention, above-mentioned and other purposes, feature and advantage of the present invention will become clearer, in the accompanying drawing:
Fig. 1 is the schematic diagram according to general Poewr control method in the mobile communication system of prior art;
Fig. 2 is the schematic diagram of expression according to the Poewr control method in the mobile communication system of the embodiment of the invention;
Fig. 3 is the block diagram of expression according to base station in the mobile communication system of embodiment of the invention virtual support power control;
Fig. 4 is the block diagram of expression according to travelling carriage in the mobile communication system of embodiment of the invention virtual support power control;
Fig. 5 is the detailed diagram of base band demodulator in the travelling carriage of presentation graphs 4, interference power measuring appliance, service power measuring appliance and pilot power measuring appliance;
Fig. 6 is the detailed diagram of PCB generator in the travelling carriage of presentation graphs 4;
Fig. 7 is the flow chart of expression according to virtual power control procedure in the travelling carriage of first embodiment of the invention;
Fig. 8 is the flow chart of expression according to virtual power control procedure in the base station of first embodiment of the invention;
Fig. 9 represent according in the travelling carriage of first embodiment of the invention to the flow chart of the actual power control procedure of Traffic Channel;
Figure 10 represent according in the base station of first embodiment of the invention to the flow chart of the actual power control procedure of Traffic Channel;
Figure 11 is the virtual power of the cut antenna of its Traffic Channel of expression and the characteristic schematic diagram of pilot power;
Figure 12 is the flow chart of expression according to virtual power control procedure in the travelling carriage of second embodiment of the invention;
Figure 13 represents the flow chart according to virtual power control procedure in the base station of second embodiment of the invention;
Figure 14 is the flow chart of expression according to virtual power control procedure in the travelling carriage of third embodiment of the invention; With
Figure 15 represents the flow chart according to virtual power control procedure in the base station of third embodiment of the invention;
Detailed description of preferred embodiment
The preferred embodiments of the present invention are described below with reference to accompanying drawings.
(1) sends diversity
When the base station sends to travelling carriage with wireless mode with forward link, adopt and send diversity; This base station is through at least two antenna transmission service signals.Then, travelling carriage is measured respectively from the intensity of the different pilot signal of antenna for base station cycle transmission, produces antenna selection signals according to measurement result, and should select signal to send to the base station.Then, by alternately adopting antenna according to the selection signal, the base station sends signal.In another approach, by alternately adopting antenna according to predetermined alternate mode, the base station can send service signal.
For this transmission diversity, need a kind of new Poewr control method, this method can be controlled the signal power that alternately sends from two or more antennas respectively.Particularly, the power that needs the cut antenna of its Traffic Channel of control.
(2) handover
When Mobile Termination provides communicating by letter of serving base station and when beginning to communicate with a new base station, handover occurs with current.During handover, travelling carriage receives service signal from carving the new base station that starts at a time then at first from providing serving base station to receive service signal.In order to control the power of the service signal that sends from the two or more base stations of between each base station, switching, must control the transmitted power of the base station that its Traffic Channel is cut off/connects.
(3) discontinuous transmission
For discontinuous transmission, according to whether having data to send, and be provided with during the transmission of traffic channel signal and during not sending.In this case, need be by a kind of to the Poewr control method during not sending.
According to embodiments of the invention,, must set up common signal channel, i.e. single channel (perch) or pilot channel in order in mobile communication system, to carry out the power control of Traffic Channel.This common signal channel sends with the constant power of each antenna of being assigned to each cell sector, therefore, can calculate the reference value of transmitted power.In code division multiple access (CDMA) communication system, each channel has identical transmitted power, but the code difference.That is each channel adopts different PN (pseudo noise) or different orthogonal code (orthogonal code can adopt Walsh (Walsh) sign indicating number).In order to increase number of codes, the walsh code that can adopt length to prolong.
To describe by way of example below and be used for cutting off the method that channel sends specific common channel signal and adopts the professional transmitted power of cutting off of this signal-virtual ground control to business for forward direction sends diversity.But, importantly be noted that the virtual power control method to be applied to handover or discontinuous transmission situation.
With reference to Fig. 2, the figure shows the forward power control method of supporting forward direction to send the mobile communication system of diversity.What Fig. 2 represented is the situation that two transmitting antennas are adopted in the base station.In Fig. 2, the gain of each antenna is set individually, so that can control the power of two antennas respectively.Among Fig. 2, thick line represents to send the professional period, and fine rule represents not send business and period of pilot signal transmitted only.In this example, suppose that the antenna switching period is several times of unit power control group period.
In addition, the channel of supposing to be used for to send on specific common signal channel at non-transmit time segments signal is a Traffic Channel, and specific common signal channel is a pilot channel.
With reference to Fig. 2, in the time times over unit power control group (PCG) time, the base station at first sends traffic channel signal through antenna ANT 1 to travelling carriage, and after this time of experience, switch to another antenna ANT 2, to send traffic channel signal (212).Can judge in the switching between these two antennas according to the antenna that receives more high-intensity pilot signal or based on cyclic pattern.
Then, a power control group in the period, travelling carriage receives traffic channel signal from antenna ANT 1, performance number to the traffic channel signal that receives that measures averages, the received signal interference power values that measures is averaged, to compare by a sir value and the threshold value that the ratio between average traffic channel signal power and the average interference power is determined, and produce power control bit PCB 1 (214) according to comparative result.In identical power control group in the period, travelling carriage receives common channel signals (that is, pilot frequency channel signal) from antenna ANT 2, and the performance number of the common channel signal that receives that measures is averaged.Subsequently, travelling carriage calculates the virtual power value according to the variable quantity between the average power content (from antenna ANT 2) of the average power content of the current common channel signal that receives (from antenna ANT 2) and the common channel signal that before received, and calculates the power control instruction value that adds up.Adopt the virtual power value that is calculated, travelling carriage averages the interference power values that measures, calculate virtual sir value according to the ratio between virtual power value and the interference power values, should virtual sir value and a threshold value compare, and produce power control bit PCB 2 according to comparative result.By the variable quantity between the power control instruction value of pilot power value and accumulation being added to the performance number of the measured signal that receives at last from respective antenna (that is, ANT 2), can calculate this virtual power value.
After this, to base-station transmitting-power control bit PCB 1 and PCB2 (216), this PCB 1 and PCB 2 produce by the power that calculates the signal that receives from two antenna ANT 1 and ANT 2 travelling carriage through reverse link.The base station receives power control bit PCB 1 and the PCB 2 with respect to antenna ANT 1 and ANT 2, and respectively according to power control bit PCB 1 and PCB 2, in the next power control group period, increase or reduce the power gain of the first antenna ANT 1 and service signal power or the pilot signal power (220) of the second antenna ANT 2.Antenna ANT1 (that is, the call completion antenna) for by its actual transmission Traffic Channel is added to power-controlled gain in the transmission of Traffic Channel; And can't help for current that it sends the antenna ANT 2 (that is, the professional antenna that cuts off) of Traffic Channel, upgrade power gain.
With reference to Fig. 3, the figure shows the base station transmission apparatus that sends diversity according to embodiment of the invention support.With reference to Fig. 3,311 pairs of baseband modulator send data and carry out chnnel coding and spread spectrum.Baseband modulator 311 can comprise quadrature modulator and PN frequency multiplier.On-off controller 313 produces the control signal of switch 315, and wherein switch 315 is carried out and sent diversity feature.Under the control of on-off controller 313, switch 315 switches to the first antenna ANT1 and the second antenna ANT 2 with the transmission signal of baseband modulator 311 outputs.The extracting data power control bit (PCB) of PCB extractor 317 from receiving through reverse chain channel, this reverse chain channel can be a reverse link pilot channel.
When operation, the transmission signal of being modulated by baseband modulator 311 switches to the first antenna ANT 1 or the second antenna ANT 2 by switch 315.The transmission signal that outputs to each antenna multiplies each other with the gain of being determined by gain controller 319.Gain controller 319 is by analyzing the power control bit that receives through reverse link pilot channel, determines to output to the gain of the transmission signal of each antenna.
With reference to Fig. 4, what the figure shows is the mobile station receiver of supporting the mobile communication system of transmission diversity.
With reference to Fig. 4, RF receiver 412 will downconvert to baseband signal from the signal that antenna ATN receives.Demodulation controller 414 controls despreading and decode operation to received signal.Base band demodulator 416 carries out despreading and decoding to received signal under the control of demodulation controller 414.Base band demodulator 416 can comprise PN despreader and quadrature demodulator.
Interference power measuring appliance 418 is measured the interference power that comprises from the received signal of RF receiver 412 outputs.Service signal power checker 420 is measured from the power of the pilot signal that receives of base band demodulator 416 outputs.Pilot signal power measuring appliance 422 is measured from the power of the pilot signal that receives of base band demodulator 416 outputs.PCB generator 424 is analyzed from each signal of measuring appliance 418,420 and 422 outputs, and produces the power control bit of forward link according to analysis result.PCB multiplexer 426 will be from the power control bit multipath conversion of PCB generator 424 output to reverse link pilot channel.
In when operation, the service power of moving table measuring call completion antenna and the professional pilot power that cuts off antenna, and produce power control bit according to the performance number that measures, and with the power control bit multipath conversion that produced to reverse link pilot channel.Under the control of demodulation controller 414,416 pairs of base band demodulators carry out demodulation from the service signal of call completion antenna with from the pilot signal that business is cut off antenna, and outgoing traffic data and pilot signal.For example, when sending service signal from the first antenna ANT 1, but not when the second antenna ANT 2 sends service signals, 416 pairs of baseband modulator are carried out demodulation from the service signal of the first antenna ANT 1 with from the pilot signal of the second antenna ANT 2.On the contrary, when sending service signals from the second antenna ANT 2, but not when the first antenna ANT 1 sends service signal, to carrying out demodulation from the service signal of the second antenna ANT 2 with from the pilot signal of the first antenna ANT 1.
The business datum of demodulation and pilot signal are offered service signal power checker 420 and pilot signal power measuring appliance 422 respectively, are used to produce power control bit from power checker 420 and 422 performance numbers of exporting that measure.In addition, the interference power values that measures from 418 outputs of interference power measuring appliance also is used to produce power control bit.Travelling carriage adopts pilot signal according to the service power value and the virtual power value that measure, produce the power control bit of each antenna, and the power control bit multipath conversion that will be produced on reverse link is gone back to the base station.
With reference to Fig. 5, what the figure shows is the base band demodulator 416 of Fig. 4 and the block diagram of power checker 418,420 and 422.
At first, will the structure of base band demodulator 416 be described.With reference to Fig. 5, multiplier 511 will multiply each other from the received signal and the PN sequence of RF receiver 412 outputs, so that this received signal is carried out the PN despreading.Multiplier 513 will multiply each other from the PN despread signal of multiplier 511 outputs and the orthogonal code of Traffic Channel, with output (extraction) traffic channel signal.Multiplier 515 will multiply each other from the PN despread signal of multiplier 511 outputs and the orthogonal code of first pilot channel, to export first pilot frequency channel signal.Multiplier 517 will multiply each other from the PN despread signal of multiplier 511 outputs and the orthogonal code of second pilot channel, with second pilot frequency channel signal in the output PN despread signal.That is multiplier 515 separates with 517 from the pilot frequency channel signal of each the antenna output with the base station that sends diversity feature.
Under the control of demodulation controller 414, two switches 519 and 520 are selected in the output of multipliers 515 and 517.Demodulation controller 414 makes switch 519 to cut off from business and selects pilot frequency channel signal the antenna, and makes that switch 520 can be from call completion sky line options pilot frequency channel signal.That is, demodulation controller 414 make switch 519 with 520 from different sky line options pilot signals.Demodulation controller 414 is shared handover informations by the on-off controller 313 that sends signaling and dispatch in next and the base station transmitter.
Interference power measuring appliance 418 is measured the interference power of received signal.Measuring appliance 418 comprises accumulator 531 and squarer 533, is used for the received signal from RF receiver 412 output is added up and asks square.Service signal power checker 420 is made up of accumulator 541 and squarer 543, and is that unit adds up to the traffic channel signal from base band demodulator 416 outputs and asks square with the symbol, to measure the signal power of Traffic Channel.Pilot signal power measuring appliance 422 is made up of accumulator 551 and squarer 553, and is that unit adds up to the pilot frequency channel signal from base band demodulator 416 outputs and asks square with the symbol, with the signal power of measurement pilot.
With reference to Fig. 6, what the figure shows is the detailed diagram of the PCB generator 424 of Fig. 4.PCB generator 424 comprises a PCB generator and the 2nd PCB generator, wherein a PCB generator is used to produce the power control bit of call completion channel, and the 2nd PCB generator is used to produce the professional power control bit that cuts off specific common signal channel (that is pilot channel).Subtracter 642 deducts the interference power by 418 outputs of interference power measuring appliance from the service power by 420 outputs of service signal power checker.Comparator 644 compares the output and a threshold value of subtracter 642, and produces the power control bit of call completion channel in the base station.What above-mentioned configuration was represented is the structure of a PCB generator.
Memory 630 comprises buffer 632,634 and 636.Buffer 632 storage power control command value dp1, this value is producing on the group of power control formerly under the professional dissengaged positions.Buffer 634 storing virtual service power values, this value are to upgrade behind the practical business power that measures to the end that is initialised.The last pilot power lpp1 of buffer 636 storages, this value is the pilot power that measures on the group of power control formerly.Subtracter 612 deducts the last pilot power lpp1 of buffer 636 from the pilot power by 422 outputs of pilot signal power measuring appliance.Adder 614 will be added in the output of subtracter 612 from the virtual service performance number of buffer 634 outputs.Adder 616 will be added in the output of adder 614 from the power control instruction value dp1 of buffer 632.Subtracter 618 deducts the interference power of interference power measuring appliance 418 from the output of adder 616.Comparator 620 compares the output and the second threshold T h2 of adder 618, and according to comparative result, produces the power control bit that is used for controlling virtually service channel power under professional dissengaged positions.Under professional dissengaged positions, antenna is only exported pilot signal, and the suppressed traffic channel signal.What above-mentioned configuration was represented is the structure of the 2nd PCB generator.
In addition, at professional disengagement phase, buffer 632,634 in the memory 630 and 636 updated stored value therein.Therefore, delayer 624 postpones pilot power, and the pilot power that postpones is stored in the buffer 636, as last pilot power lpp1.Delayer 626 postpones the output of adders 614, and the value that will postpone is stored in the buffer 634, as virtual service power.Delayer 622 prolongs the output of comparators 620, and the value that will postpone is stored in the buffer 632, as power control instruction value dp1.
Cut off the signal that antenna receives by analyzing respectively from call completion antenna and business, the travelling carriage with Fig. 4 to 6 structure produces and sends power control bit to the base station.Then, the power control bit that sends from travelling carriage is analyzed in the base station, and comes the gain of control antenna respectively according to analysis result.Here, for the call completion antenna, gain is added in the actual transmission.But, cut off antenna for business, gain is not added in the actual transmission, and only is that maintenance and renewal are connected until Traffic Channel.That is when Traffic Channel was connected, the base station adopted the gain of upgrading to start the transmission power control operation.In addition, when Traffic Channel is cut off, will once be added in the actual transmission, but only keep and upgrade by the actual gain that is added in the transmission.
Independent power control operation is carried out to each antenna in the base station.In addition, carry out these operations according to current switching state.That is when reality was carried out power control to the first antenna ANT 1, actual power control was not carried out to the second antenna ANT 2 in the base station, but continues to upgrade power gain simply.When reality was carried out power control to the second antenna ANT 2, actual power control was not carried out to the first antenna ANT 1 in the base station, but continues to upgrade power gain simply.
For sending, according to control signal the described switch 315 of Fig. 3 is controlled, business datum is switched to antenna ANT 1 and ANT 2 from on-off controller 313 from service in base station.Demodulation controller 414 instruction base band demodulators 416 in the travelling carriage of Fig. 4 carry out demodulation with the pattern identical with on-off controller 313 to service signal and pilot signal from respective antenna.On-off controller 313 shares handover information with demodulation controller 414 by sending signaling and scheduling.
A. first embodiment
Fig. 7 shows the flow chart according to the virtual power control procedure in the travelling carriage of first embodiment of the invention.At professional disengagement phase, in step 711, travelling carriage is stored the practical business power that measures at last that receives from Traffic Channel in the buffer 634 of memory 630, with it as virtual service power, be stored in the pilot power that measures on the previous power control group, it as last pilot power lpp1, and is stored in power control instruction value on the previous power control group, with it as power control instruction value dp1.After this, in step 713, travelling carriage determines whether to start new power control group.When starting new power control group, in step 715, moving table measuring cuts off the pilot signal power of antenna from business, and store in order cut off antenna from business pilot power as the first current pilot power pp1, storage (virtual service power)+dp1+ (pp1-lpp1) as virtual service power, storage (virtual service power)-(interference power) is as virtual SIR, and storage pilot power pp1 is as last pilot power lpp1.Can measure virtual SIR as illustrated in fig. 6.In current and subsequently each embodiment, rating formula is based on the dB value.
After this, in step 717, travelling carriage compares the virtual SIR and the first threshold T h1 to determine dp1.When virtual SIR＞Th1, dp1 is defined as-1 (step 719).Otherwise, when virtual SIR is less than or equal to Th1, dp1 is defined as+1 (step 721).After this, in step 723, travelling carriage sends to the base station with determined dp1 value as power control bit (PCB).After sending this power control bit to the base station, travelling carriage determines whether to have connected Traffic Channel (step 725).When Traffic Channel was connected, travelling carriage finished this routine.Otherwise travelling carriage turns back to step 713, and repeats said process.
Fig. 8 represents is flow chart according to the virtual power control procedure in the base station of first embodiment of the invention.Under professional dissengaged positions, in step 812, the yield value gain1 that the base station cuts off antenna with business is defined as last practical business gain.After this, when when step 814 receives power control bit (that is, the dp1 value) from travelling carriage, in step 816, the gain (gain1) that the base station cuts off transmitter with business is updated to gain1+dp1.When detecting new power control group in step 818, in step 820, the base station determines whether to connect Traffic Channel.When Traffic Channel was connected, this routine was finished in the base station.Otherwise the base station turns back to step 814, and repeats said process.
Flow chart as reference Fig. 7 and 8 is described, can define virtual power control procedure on the professional antenna that cuts off transmitter with reference to following table 1.
Table 1
| ＝＜711〉 1＝＜711〉 dp1＝＜711〉 , { ＜715〉 1＝＜715〉 ＝+dp1+ ( 1-1 )＜715〉 SIR＝-＜715〉 1＝1＜715〉 ( SIR＞1 )＜717〉 dp1＝-1＜719〉 dp1＝+1＜721〉 PCB ( dp1 ) ＜723〉 ( ) ＝+dp1＜816〉 } |
Therefore, virtual SIR=(initial virtual service performance number)+(the power control instruction value that adds up)+(pilot power variable quantity)-(interference power), the power control instruction value that wherein adds up is to cut off the summation of the power control instruction value (that is the dp1 value that sends by PCB) of moment power control group to the end from business.
With reference to Figure 11, what the figure shows is the professional characteristic curve that cuts off virtual power and pilot power on the antenna.Among Figure 11, fine rule is represented the characteristic curve of pilot power, is the characteristic curve of virtual power and thick line is represented.
With reference to Fig. 9, what the figure shows is according to the actual power control procedure of first embodiment of the invention in travelling carriage.With reference to Figure 10, what the figure shows is according to the actual power control procedure of first embodiment of the invention in the base station.
With reference to Fig. 9, during call completion, in step 911, travelling carriage is with the virtual service power of practical business power setting for measuring at last.After this, in step 913, travelling carriage determines whether to start new power control group.When starting new power control group, in step 915, according to actual SIR=(practical business power)-(interference power), moving table measuring practical business power.
After this, in step 917, travelling carriage compares the actual SIR and the second threshold T h2, to start dp2.When actual SIR＞Th2,, the second power control bit dp2 is defined as-1 in step 919.Otherwise, when actual SIR is less than or equal to Th2, in step 921, the second power control bit dp2 is defined as+1.After this, in step 923, travelling carriage sends to the base station with the determined second power control bit dp2 as power control bit (PCB).After sending this power control bit to the base station, in step 925, travelling carriage determines whether Traffic Channel is cut off.When Traffic Channel was cut off, travelling carriage finished this routine.Otherwise when keeping the call completion state, travelling carriage turns back to step 913, and repeats said process.
With reference to Figure 10, under the call completion state, in step 1012, last virtual service gain is arranged to the yield value gain2 of call completion antenna in the base station.After this, when in step 1014 when travelling carriage receives power control bit (or dp2), in step 1016, the base station is updated to gain2+dp2 with the gain gain2 of call completion transmitter.When detecting new power control group in step 1018, the base station sends the Traffic Channel with power-controlled gain (being gain2) in step 1020, and determines whether to cut off Traffic Channel in step 1022.When Traffic Channel was cut off, this routine was finished in the base station.Otherwise when keeping the call completion state, the base station turns back to step 1014, and repeats said process.
With reference to Fig. 9 and 10 described, can define actual power control procedure on the call completion antenna as above-mentioned with reference to table 2.
Table 2
| The virtual service power of practical business power=measure at last＜step 911〉during call completion, the process below repeating with each power control group measure practical business power＜step 915〉actual SIR=practical business power-jamming power＜step 915〉if (actual SIR＞threshold value 2)＜step 917 〉 |
| Dp2=-1＜step 919〉otherwise dp2=+1＜step 921 PCB sent from travelling carriage, (dp2 value) is to base station＜step 923 〉, (in the base station) practical business power=practical business power+dp2＜step 1016〉} |
B. second embodiment
With reference to Figure 12 and 13, shown in be respectively according to the virtual power control procedure of second embodiment of the invention in travelling carriage and base station.
With reference to Figure 12, at professional disengagement phase, in step 1212, the practical business power that the travelling carriage storage measures at last is as virtual service power, being stored in the pilot power that measures on the previous power control group is last pilot power lpp1, and the power control instruction value of storing on the previous power control group is power control instruction value dp1, and the power control instruction value sum1 that adds up is set to 0.After this, in step 1214, travelling carriage determines whether to start new power control group.When starting new power control group, in step 1216, moving table measuring cuts off the pilot signal power that antenna receives from business, and the pilot power that cuts off antenna from business is set to current pilot power pp1, (virtual service power)+dp1+ (pp1-lpp1) is set to virtual service power, (virtual service power)-(interference power) is set to virtual SIR, and current pilot power pp1 is set to last pilot power lpp1.
After this, in step 1218, travelling carriage compares the virtual SIR and the first threshold T h1.When virtual SIR＞Th1,, dp1 is defined as-1 in step 1220.Otherwise, when virtual SIR is less than or equal to Th1, in step 1222, dp1 is defined as+1.After this, in step 1224,, determined dp1 upgrades sum1 by being added to sum1.Then, travelling carriage determines whether to prepare to connect Traffic Channel (that is call completion standby condition; Step 1226).When failing to detect the call completion standby condition, travelling carriage turns back to step 1214, and repeats said process.But when detecting the call completion standby condition, in step 1228, travelling carriage sends to the base station with the sum1 value, finishes this routine then.
With reference to Figure 13, at professional dissengaged positions, the last business gain in base station is set to the professional yield value gain1 (step 1311) that cuts off antenna.After this, the base station determines whether Traffic Channel prepares to connect (step 1313).When keeping professional dissengaged positions, travelling carriage remains on the yield value gain1 that determines in the step 1311.But, when detecting the call completion standby condition, the base station receives the sum1 value (step 1315) that sends from travelling carriage, and upgrades yield value gain1 by the sum1 value being added to the gain1 value of determining in step 1311, with the gain of control antenna in the call completion standby condition (step 1317).After this, the base station determines whether to connect Traffic Channel (step 1319).When detecting the call completion state, the base station adopts gain control value gain1 to control the power that sends to the signal of travelling carriage through Traffic Channel.
Summarize second embodiment simply, Figure 12 and 13 the virtual power control method according to second embodiment do not send the professional power control bit that cuts off channel, but just send the virtual service performance number of upgrading through reverse link before connecting Traffic Channel.In a second embodiment, the Poewr control method of professional cut-out antenna and the method for first embodiment are basic identical, and difference is to send the virtual service performance number immediately before connecting Traffic Channel, rather than with each power control group transmission power control bit.Here, the call completion antenna only needs a power control bit.
C. the 3rd embodiment
With reference to Figure 14 and 15, what they were represented respectively is according to the virtual power control procedure of third embodiment of the invention in travelling carriage and base station.
With reference to Figure 14, at professional disengagement phase, in step 1412, the last practical business performance number of measuring of travelling carriage storage is as virtual service power, and is stored in the pilot power that measures on the previous power control group as last pilot power lpp1.After this, travelling carriage determines whether service signal prepares to connect (that is call completion standby condition; Step 1414).When failing to detect the call completion standby condition, travelling carriage remains on virtual service power definite in the step 1412 and last pilot power.But, when detecting the call completion standby condition, in step 1416, moving table measuring cuts off the interference power that antenna receives and the power of pilot signal from business, and be set to current pilot power pp1 from the pilot power that business is cut off antenna, (virtual service power)+(pilot power pp1)-(last pilot power lpp1) is set to virtual service power, and (service power)-(interference power) is set to virtual SIR.
After this, in step 1418, travelling carriage is determined the step1 value by deduct the first threshold T h1 from virtual SIR, and in step 1420 this step1 value is sent to the base station.After sending this step1 value, travelling carriage finishes this routine.
With reference to Figure 15, at professional dissengaged positions, in step 1511, the last practical business gain in base station is set to the professional yield value gain1 that cuts off antenna.After this, in step 1513, the base station determines whether Traffic Channel is prepared to connect.When keeping professional dissengaged positions, travelling carriage remains on the yield value of determining in the step 1511.But, when detecting the call completion standby condition, in step 1515, the base station receives the step1 value that sends from travelling carriage, and in step 1517, upgrade yield value gain1 by this step1 value being added to the gain1 value of in step 1511, determining, gain with control antenna in the call completion standby condition.After this, in step 1519, the base station determines whether Traffic Channel is connected.When detecting the call completion state, this routine is finished in the base station, and beginning sends signal through Traffic Channel to travelling carriage.
As mentioned above, virtual power control method according to the 3rd embodiment of Figure 14 and 15 does not send the professional power control bit that cuts off channel, but just before connecting Traffic Channel through reverse link transmit power value (Step1), this value is to calculate according to the pilot power and the interference power that measure.That is, rated output controlling value as follows: according to pilot power and the interference power before cutting off Traffic Channel just, and the just pilot power before connecting Traffic Channel and the difference between the interference power.
Power control value=(the just SIR before business is cut off)+((just at the pilot power before the call completion)-(the just pilot power before business is cut off))-((just in the interference power before the call completion)-(the just interference power before business is cut off))-Th1
Travelling carriage just sent to the base station through reverse link with the power control value that calculates before connecting Traffic Channel.Here, for the call completion antenna, only need a power control bit.In addition, travelling carriage needn't be carried out pilot power measurement and virtual power calculating in each power control group.
Above-mentioned virtual power control method has guaranteed reliable operation, unless occur sending mistake in the channel.But when occurring sending mistake in the channel, virtual power value and actual power value have deviation, cause " random walk (random walk) " problem.In order to address this problem, can adopt following method:
(1) when the backward channel quality is low (, when analyzing SIR when low) do not adopt the power control instruction value of accumulation.
(2) upper limit of the power control instruction value of restriction accumulation.
(3) switched antenna periodically.
Virtual power control method of the present invention is being applied under the situation of handover, and two different base stations correspond respectively to two different antennas with a base station controller (BSC) and support to send the switch of the same base of diversity.
In addition, under the situation of the mobile communication system that virtual power control method of the present invention is applied to support discontinuous sending mode, if an antenna, and through antenna connection/cut-out Traffic Channel.
The wherein communication system of connection/cut-out Traffic Channel has been described above.This method can be controlled transmitted power effectively, thus feasible interference minimum to other users.Specifically, even when Traffic Channel is cut off, this method still can be controlled transmitted power.That is when Poewr control method of the present invention was applied to support the channellized transmitter of discontinuous sending mode, the base station sent real data and send particular channel signal (as pilot frequency channel signal) during not sending data during data send.In addition, travelling carriage can start the 2nd PCB generator during data send, and starts a PCB generator during not sending data.
Although represented with reference to its certain preferred embodiment and described the present invention, but the one of ordinary skilled in the art it should be understood that the modification that can carry out on various forms and the details under the situation that does not deviate from the design of the present invention that is defined by the following claims and scope.
Claims (22)
1. the dispensing device of a code division multiple access (CDMA) base station, wherein this base station comprises that at least two antennas and one are used for the spread spectrum service signal is switched to a switch on the antenna, described dispensing device comprises:
Adder, the business that is connected described switch and does not send described spread spectrum service signal is cut off between (traffic-OFF) antenna, is used for through the described professional antenna transmission common channel signal that cuts off.
2. dispensing device as claimed in claim 1 also comprises on-off controller, is used for the analysis according to the message that receives that sends from travelling carriage, and described switch is connected on the antenna with good channel environment.
3. dispensing device as claimed in claim 1 also comprises on-off controller, is used for according to the transmitting antenna cyclic pattern, controls described switch described service signal is switched on the described antenna.
4. as claim 2 or 3 described dispensing devices, the switching cycle of wherein said on-off controller is longer than or is equaled the power control group period.
5. dispensing device as claimed in claim 1 also comprises:
The power control bit extractor is used to extract the power control bit that sends from travelling carriage; With
Gain controller is used for the power control bit according to described extraction, controls from the transmitted power that respectively sends signal of described antenna output.
6. dispensing device as claimed in claim 1, wherein said common signal channel is a pilot channel.
7. the channel dispensing device of base station in the cdma communication system comprises:
The data channel generator is used under discontinuous sending mode the data spread spectrum, and sends described spread spectrum data;
The common signal channel generator is used to produce common channel signal; With
Switch is used for exporting the output of described common signal channel generator selectively, and not exporting spread data signals when when described data channel generator is not exported spread-spectrum signal.
8. channel dispensing device as claimed in claim 7, the switching cycle of wherein said switch are longer than or are equaled the power control group period.
9. channel dispensing device as claimed in claim 8 also comprises:
The power control bit extractor is used to extract the power control bit that sends from travelling carriage; With
Gain controller is used for the power control bit according to described extraction, controls the transmitted power that sends data.
10. the output control device of travelling carriage in the cdma communication system, wherein this cdma communication system comprises the base station, this base station sends service signal through one of at least two antennas, and through another antenna transmission common channel signal, described device comprises:
Receiver is used for receiving through an antenna business and the common channel signal of described transmission;
The interference power measuring appliance is used to measure the power from the interference signal of described receiver output;
The public channel power measuring appliance is used to measure the power from the described common channel signal of described receiver output;
The service channel power measuring appliance is used to measure the power from the described service signal of described receiver output;
The power control bit generator is used for the power control bit by the business cut-out channel that described common channel signal and interference signal is carried out computing, produce sending described common channel signal; With
Multiplexer is used for described power control bit multipath conversion to reverse chain channel.
11. as output control device as described in the claim 10, wherein said power control bit generator comprises:
The first power control bit generator is used for first power control bit by the business cut-out channel that the power of described common channel signal and the power of described interference signal is carried out computing, produce sending described common channel signal; With
The second power control bit generator is used for producing second power control bit of the call completion channel that sends described service signal by the power of described service signal and the power of described interference signal are carried out computing.
12. output control device as claimed in claim 11, the wherein said first power control bit generator comprises:
Signal interference ratio (SIR) measuring appliance, being used at professional disengagement phase is that the power that cuts off the common channel signal of antenna from business is measured by unit with power control group, to calculate virtual SIR; With
Comparator is used for a described virtual SIR and a threshold value are compared, and determines the value of described power control bit according to comparative result;
Wherein said virtual SIR is defined as follows:
Virtual SIR=(virtual service power)-(interference power)
(virtual service power)=(virtual service power)+(power control instruction value)+((current public channel power)-(previous public channel power))
Wherein, described virtual service power is last practical business power, and described previous public channel power is the power of the described common signal channel formerly measured by described public channel power measuring appliance under the state.
13. output control device as claimed in claim 12, wherein said common channel signal is a pilot frequency channel signal.
14. the transmission deversity scheme of a cdma base station, wherein this cdma base station comprises at least two antennas and a switch that is used for the service signal of spread spectrum is switched to one of them antenna, and this transmission deversity scheme comprises the following steps:
Service signal through the described spread spectrum of an antenna transmission; With
Through another antenna transmission common channel signal.
15. transmission deversity scheme as claimed in claim 14 also comprises as next step: analyze the message that receives that sends from travelling carriage, and described switch is connected on the antenna with good channel environment according to analysis result.
16. transmission deversity scheme as claimed in claim 14, wherein said switch switches on the described antenna according to cyclic pattern and described service signal.
17. as claim 15 or 16 described transmission deversity schemes, the switching cycle of wherein said switch is longer than or is equaled the power control group period.
18. transmission deversity scheme as claimed in claim 14, wherein said common signal channel is a pilot channel.
19. the Poewr control method of travelling carriage in the cdma communication system, wherein this cdma communication system comprises the base station, and this base station sends service signal through one of at least two antennas, and through another antenna transmission common channel signal, described method comprises the following steps:
Receive described business and common channel signal that described base station sends;
The power of the interference signal that measurement receives from described base station, described common channel signal and described traffic channel signal;
Cut off the power control bit of channel by the business of described common channel signal and interference signal being carried out computing, produce sending described common channel signal; With
Described power control bit multipath conversion is arrived reverse chain channel.
20. as Poewr control method as described in the claim 19, wherein said power control bit generation step comprises the following steps:
Cut off first power control bit of channel by the business of the power of described common channel signal and the power of described interference signal being carried out computing, produce sending described common channel signal; With
By the power of described service signal and the power of described interference signal are carried out computing, produce second power control bit of the call completion channel that sends described service signal.
21. Poewr control method as claimed in claim 20, the wherein said first power control bit generation step comprises the following steps:
Is that the common channel signal that cuts off antenna from business is measured by unit at professional disengagement phase with power control group, to calculate virtual SIR; With
A described virtual SIR and a threshold value are compared, and determine the value of described power control bit according to comparative result;
Wherein said virtual SIR is defined as follows:
Virtual SIR=(virtual service power)-(interference power)
(virtual service power)=(virtual service power)+(power control instruction value)+((current public channel power)-(previous public channel power))
Wherein, described virtual service power is last data service power, and described previous public channel power is the power of the described common signal channel formerly measured by described public channel power measuring appliance under the state.
22. Poewr control method as claimed in claim 21, wherein said common channel signal is a pilot frequency channel signal.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019980022219A KR100322024B1 (en) | 1998-06-13 | 1998-06-13 | Power control apparatus and method for code division multiple access communication system |
| KR1998/22219 | 1998-06-13 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1273008A true CN1273008A (en) | 2000-11-08 |
| CN1123238C CN1123238C (en) | 2003-10-01 |
Family
ID=19539410
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN99800887A Expired - Fee Related CN1123238C (en) | 1998-06-13 | 1999-06-14 | Power control device and method for mobile communication system |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP1021921A1 (en) |
| KR (1) | KR100322024B1 (en) |
| CN (1) | CN1123238C (en) |
| AU (1) | AU735195B2 (en) |
| BR (1) | BR9906490A (en) |
| CA (1) | CA2295795A1 (en) |
| ID (1) | ID24823A (en) |
| WO (1) | WO1999066744A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1985447B (en) * | 2004-05-17 | 2010-06-02 | 高通股份有限公司 | Interference control via selective blanking/attenuation of interfering transmissions |
| CN102823307A (en) * | 2010-04-05 | 2012-12-12 | 高通股份有限公司 | Power headroom reporting |
| CN105227205A (en) * | 2015-08-28 | 2016-01-06 | 宇龙计算机通信科技(深圳)有限公司 | Antenna system and apply the communication terminal of this antenna system |
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| US9118387B2 (en) | 1997-11-03 | 2015-08-25 | Qualcomm Incorporated | Pilot reference transmission for a wireless communication system |
| US7184426B2 (en) | 2002-12-12 | 2007-02-27 | Qualcomm, Incorporated | Method and apparatus for burst pilot for a time division multiplex system |
| US8064409B1 (en) | 1999-08-25 | 2011-11-22 | Qualcomm Incorporated | Method and apparatus using a multi-carrier forward link in a wireless communication system |
| KR20010035820A (en) * | 1999-10-04 | 2001-05-07 | 조정남 | Apparatus for generating a cdma signal for variable traffic conditions in telecommunication system |
| US6621804B1 (en) | 1999-10-07 | 2003-09-16 | Qualcomm Incorporated | Method and apparatus for predicting favored supplemental channel transmission slots using transmission power measurements of a fundamental channel |
| DE60138800D1 (en) * | 2000-10-05 | 2009-07-09 | Samsung Electronics Co Ltd | TSTD DEVICE AND METHOD FOR A MOBILE TDD-CDMA COMMUNICATION SYSTEM |
| US7068683B1 (en) | 2000-10-25 | 2006-06-27 | Qualcomm, Incorporated | Method and apparatus for high rate packet data and low delay data transmissions |
| US6973098B1 (en) | 2000-10-25 | 2005-12-06 | Qualcomm, Incorporated | Method and apparatus for determining a data rate in a high rate packet data wireless communications system |
| US6768727B1 (en) | 2000-11-09 | 2004-07-27 | Ericsson Inc. | Fast forward link power control for CDMA system |
| KR100842613B1 (en) * | 2002-05-13 | 2008-07-01 | 삼성전자주식회사 | Apparatus for controlling transmission power of high speed shared control channel in time division duplexing code division multiple access communication system using high speed downlink packet access scheme and method thereof |
| KR100966551B1 (en) * | 2003-03-17 | 2010-06-29 | 엘지전자 주식회사 | power control method in variable data rate |
| US8811200B2 (en) | 2009-09-22 | 2014-08-19 | Qualcomm Incorporated | Physical layer metrics to support adaptive station-dependent channel state information feedback rate in multi-user communication systems |
| CN102131225B (en) * | 2010-08-16 | 2013-04-17 | 华为技术有限公司 | Method and device for measuring state information of data channel |
| CN103248410B (en) * | 2012-02-03 | 2017-04-12 | 瑞昱半导体股份有限公司 | Wireless communication circuit supporting antenna diversity mechanism |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI94579C (en) * | 1994-01-12 | 1995-09-25 | Nokia Mobile Phones Ltd | Data Transfer method |
| US5737327A (en) * | 1996-03-29 | 1998-04-07 | Motorola, Inc. | Method and apparatus for demodulation and power control bit detection in a spread spectrum communication system |
-
1998
- 1998-06-13 KR KR1019980022219A patent/KR100322024B1/en not_active IP Right Cessation
-
1999
- 1999-06-14 CA CA002295795A patent/CA2295795A1/en not_active Abandoned
- 1999-06-14 ID IDW20000255A patent/ID24823A/en unknown
- 1999-06-14 AU AU41717/99A patent/AU735195B2/en not_active Ceased
- 1999-06-14 BR BRPI9906490-1A patent/BR9906490A/en not_active IP Right Cessation
- 1999-06-14 CN CN99800887A patent/CN1123238C/en not_active Expired - Fee Related
- 1999-06-14 WO PCT/KR1999/000298 patent/WO1999066744A1/en not_active Application Discontinuation
- 1999-06-14 EP EP99925448A patent/EP1021921A1/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1985447B (en) * | 2004-05-17 | 2010-06-02 | 高通股份有限公司 | Interference control via selective blanking/attenuation of interfering transmissions |
| CN101714881B (en) * | 2004-05-17 | 2013-08-14 | 高通股份有限公司 | Interference control via selective blanking/attenuation of interfering transmissions |
| CN102823307A (en) * | 2010-04-05 | 2012-12-12 | 高通股份有限公司 | Power headroom reporting |
| CN105227205A (en) * | 2015-08-28 | 2016-01-06 | 宇龙计算机通信科技(深圳)有限公司 | Antenna system and apply the communication terminal of this antenna system |
| CN105227205B (en) * | 2015-08-28 | 2018-01-09 | 宇龙计算机通信科技(深圳)有限公司 | The communication terminal of antenna system and the application antenna system |
Also Published As
| Publication number | Publication date |
|---|---|
| BR9906490A (en) | 2007-05-29 |
| CA2295795A1 (en) | 1999-12-23 |
| KR20000001795A (en) | 2000-01-15 |
| AU4171799A (en) | 2000-01-05 |
| KR100322024B1 (en) | 2002-06-24 |
| EP1021921A1 (en) | 2000-07-26 |
| CN1123238C (en) | 2003-10-01 |
| AU735195B2 (en) | 2001-07-05 |
| ID24823A (en) | 2000-08-24 |
| WO1999066744A1 (en) | 1999-12-23 |
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