CN1630219A - Polarization diversity PHS communication system omnidirectional intelligent antenna - Google Patents
Polarization diversity PHS communication system omnidirectional intelligent antenna Download PDFInfo
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- CN1630219A CN1630219A CN 200410026070 CN200410026070A CN1630219A CN 1630219 A CN1630219 A CN 1630219A CN 200410026070 CN200410026070 CN 200410026070 CN 200410026070 A CN200410026070 A CN 200410026070A CN 1630219 A CN1630219 A CN 1630219A
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Abstract
This invention refers to polarization diversity omnidirection intelligent antenna for personal access phone system, which contains three 45 degree polarization sector six array antenna, complex controller and power amplifier, wherein the three 45 degree polarization sector six array antenna receive and transmit up and down signal, then controlling amplitude and phase by complex controller to form the omnidirection covering. Said invention can update the 10mw base station to 50mw one.
Description
Technical field
The present invention relates to antenna for base station, the polarization diversity omnidirectional intelligent aerial that especially a kind of Personal Handyphone System PHS communication system base station is used.
Background technology
Along with developing rapidly of global mobile communication business, number of users is in continuous increase, and professional type is also more and more diversified, thereby frequency resource has become the matter of utmost importance that solves the Communication Development bottleneck.At present, the technological means that addresses this problem has two kinds, a kind of means are to optimize the mobile network by increasing spectral bandwidth and base station and number of cells, improve the network coverage and capacity, but drop into huge, the interference problem of bringing is also more outstanding, and the frequency resource of expansion is very limited.Second kind of means is by intelligent antenna technology extension frequency resource, this means are to solve effectively stimulating the menstrual flow of frequency problem, show great attention to countries in the world government, capital equipment manufacturer and operation commercial city, and drop into great amount of manpower and material resources and ability is studied.The 3G (Third Generation) Moblie normal structure has realized that the important function of smart antenna aspect the reduction network interferences, in 3-G (Generation Three mobile communication system), wide band code division multiplex (MUX) access WCDMA and the standard formulation that is applied to a kind of wideband CDMA technology cdma2000 of 3G have taken into full account compatible intelligent antenna technology, support the clause of intelligent antenna technology to occur, and intelligent antenna technology one of the core technology of the another one standard TD SDMA TD-SCDMA of 3-G (Generation Three mobile communication system) especially, visible smart antenna has become the important component part of 3G.
Intelligent antenna technology is applied to radar, sonar, military aspect at first, is called adaptive array antenna.Be introduced into mobile communication system afterwards, be called smart antenna.Intelligent antenna technology is the concrete application in the wireless mobile communications field of a kind of multiple-input, multiple-output MIMO or MIMO antenna MTMRA technology.The principle of smart antenna is to utilize shaped-beam, and the antenna pattern main lobe is aimed at desired orientation, and the low gain secondary lobe is aimed at interference radiating way, finishes airspace filter.Simultaneously, intelligent antenna technology utilizes the difference of signal space feature between each mobile subscriber, receives on same channel and with launching a plurality of mobile subscriber's signals mutual interference does not mutually take place, makes the transmission of the utilization of radio-frequency spectrum and signal more effective.General under the situation that does not increase system complexity, the use smart antenna just can satisfy the needs of the service quality and the network capacity extension, and the communication resource has been extended to spatial domain, no longer is confined to time-domain, frequency domain and sign indicating number territory, belongs to space division multiple access SDMA system.Therefore, intelligent antenna technology reduces and disturbs by space filtering, can reach the increase capacity, enlarge the purpose that covers and improve network quality, and required Financial cost is more reasonable.
Smart antenna can be divided into fixed beam smart antenna and adaptive beam smart antenna according to the kinetic characteristic of shaped-beam, wherein:
The fixed beam smart antenna is the array antenna of a plurality of radio frequency inputs, delivery outlet, controls mutually in conjunction with the width of cloth of butler matrix, can reach at a horizontal coverage sector, and for example 120 ° of sectors produce a plurality of electromagnetic beams simultaneously.Each wave beam is because horizontal lobe narrowed width, for example, changes to 30 ° from 120 °, both improved gain, also reduced the influence of interference and multipath effect, improved the Signal to Interference plus Noise Ratio of system.Because the cellphone subscriber is in mobile communication, the switching from a wave beam to another wave beam is the agreement control by inside of base station, thereby its technical sophistication degree is lower, realizes easily.But this antenna system has only theoretically when the user is in the wave beam centre, and intelligent effect is only the most effective, in case the user leaves beam center, signal will decline.As user during near the edge of wave beam, before switching to adjacent beams, sizable decline can take place in signal strength signal intensity, may produce call drop.
The adaptive beam smart antenna also is the array antenna of a plurality of radio frequency inputs, delivery outlet, each radio frequency input, delivery outlet all connect a cover radio-frequency (RF) transceiver, by the Base-Band Processing algorithm, determine that the base station receives arrival bearing, extract the receiving phase information of each array antenna of incoming wave direction, and when emission, give corresponding each array antenna with this information, obtain the launching beam identical with received beam.Because multi-antenna array is along with the number of arrays purpose increases, wave beam is narrower, thereby the horizontal beam that this adaptive beam smart antenna forms narrows down, and the single array antenna of the ratio of gains improves, and interference and multipath effect reduce, and has improved the Signal to Interference plus Noise Ratio of system.For the cellphone subscriber of different directions, the receiving phase of each array antenna is also different.The launching beam of figuration points to different cellphone subscribers thus, when the cellphone subscriber moves, extracts the array antenna phase information during Base-Band Processing, and array of controls antenna transmitter, phase correspondingly, makes launching beam with the moving of mobile phone, and is called the wave beam tracking.Because this adaptive beam smart antenna is to handle at the enterprising line algorithm of base band DSP, the insertion loss of having cast out butler matrix, therefore to compare signal to noise ratio higher with fixed beam intelligent antenna.But, the algorithm complexity of this antenna, the hardware platform disposal ability that needs, and system configuration complexity, the cost performance of system reduces; The obstacle that seamlessly transits that has intelligent band processing system and non intelligent antenna system simultaneously.
Because smart antenna must design with system, rather than, therefore be difficult to directly apply to original base station system as an auxiliary equipment after the system design well.In order to overcome above-mentioned shortcoming, released the product of a kind of being called " duplex tower top amplifier " on the market.It seals in one " bilateral amplifier " at former antenna for base station root, and descending base station transmit signals is carried out power amplification, and up base station received signal is carried out " low noise amplification ", to improve the Signal to Interference plus Noise Ratio of base station system, enlarges effective covering of base station.But owing to be subjected to " low noise amplifier " to improve the restriction of degree, usually reduce system noise 1～2dB only, thereby increase " duplex tower top amplifier ", though increased descending covering, up improvement is very little, the base station is effectively covered increase not obvious, and it is up and down link is asymmetric, Personal Handyphone System system particularly, because of its mobile phone power 10mw only, " duplex tower top amplifier " more falls flat.
Summary of the invention
The objective of the invention is to overcome the deficiency of above-mentioned duplex tower top amplifier formula antenna for base station, providing a kind of is not changing original Personal Handyphone System PHS base station and is still using on the basis of 10mw small-power mobile phone, can improve the up-downgoing gain of original base station, enlarge the Personal Handyphone System PHS communication system omnidirectional intelligent aerial of the polarization diversity of original base station range, make the little upgrading base station of Personal Handyphone System PHS, reach the coverage effect of the big base station of 500MW.
Realize that the object of the invention technical thought is " tower amplifier " design philosophy that does not change former architecture of base station, only former antenna for base station is replaced by polarization diversity omnidirectional intelligent aerial of the present invention.Based on time-division system, the active part of smart antenna obtains the transmitting-receiving control signal from the transmission signal of former base station, can guarantee to stand erectly with original hase to connect the synchronizing characteristics that links to each other, and realizes the upgrading to little base station; Utilize the array antenna principle of the input of a plurality of radio frequencies, delivery outlet of smart antenna and directional antenna than the high characteristics of omnidirectional antenna gain, design a kind of novel intelligent antenna that can improve base station range.Its technical scheme is reception antenna to be covered to change into by three ± 45 ° polarization sector six array antennas combinations by original omnidirectional antenna cover, the associating reception, and amplitude and phase place by the array of controls antenna, reach high-gain omnidirectional polarization diversity usefulness, increase the up link receiving gain, keep the balance of uplink and downlink link.One of its technical characterictic is that three ± 45 ° polarization sector six array antennas and active control unit are integrated as a whole, reduce the loss of feeder line, reduce and receive noise factor, improve snr of received signal, this active control unit is made up of width of cloth phase controller, transmitting-receiving isolator, power amplifier and DC power supply.Two of characteristics are to adopt three ± 45 ° polarization sector six array directional antennas, form and receive omnidirectional's covering, wherein, three+45 ° polarization sector tri-array antennas are used to finish upward signal and receive, the upward signal that is about to receive, after carrying out the synthetic and selectivity polarization diversity of omnidirectional and receive by width of cloth phase controller, the ingoing power amplifier amplifies, and is input to the base station again; Three-45 ° polarization sector tri-array antennas are used to finish upward signal reception and downstream signal emission two-way function, unite reception with+45 ° of polarization tri-array antennas during up reception, and with the upward signal that receives, after carrying out the synthetic and selectivity polarization diversity of omnidirectional and receive by another width of cloth phase controller, after amplifying, transmitting-receiving isolator ingoing power amplifier is input to the base station again; During downlink, after by power amplifier the 10MW descending power of former base station being amplified, via the transmitting-receiving isolator, be assigned to three-45 ° of array directional antennas by width of cloth phase controller, the descending forwarding of sub-sequence on time forms emission omnidirectional and covers.
The present invention has tangible advantage compared with the prior art:
1. compare with the PHS passive antenna that generally uses at present,, replace former spatial polarizations diversity, dwindled antenna space greatly and taken volume because the up polarization diversity processing array antenna that utilizes is done omnidirectional's covering; Because descending employing selectivity is amplified, guaranteed the up-downgoing balance of transmission channel simultaneously, and downstream signal only uses a control channel can realize that omnidirectional covers.
With the traditional intelligence antenna ratio, omitted the hardware device of large amount of complex; Do not need to carry out complicated signal processing; Omitted calibrate, with low cost.
3. with traditional " duplex tower top amplifier " comparison, overcome " duplex tower top amplifier " and only relied on the noise factor that improves the reception noise amplifier limitedly, can not remedy because mobile phone power is little, up effective covering increases unconspicuous problem; Increased the gain of up link, guaranteed upper and lower shape link balance, made little base station reach effective covering of big base station.
By showing to the Personal Handyphone System 10mW base station of using smart antenna of the present invention with to the fixed test contrast of the 500mW base station of using common antenna, use its coverage effect of 10mW base station of smart antenna of the present invention to be better than the effect that common antenna is used in the 500mW base station, its data are as shown in the table:
| Classification | The strong coverage rate of high field | The strong coverage rate of inferior high field | Coverage distance greater than 40dB μ V |
| The common antenna in 500mw base station | ??91.18％ | ??71.57％ | 782 meters |
| The 10mw base station intelligent antenna | ??99.31％ | ??89.58％ | 822 meters |
Description of drawings
Fig. 1 is a schematic diagram of the present invention
Fig. 2 is overall structure figure of the present invention
Fig. 3 is the outline drawing of one embodiment of the present of invention
Fig. 4 is a horizontal directivity pattern of the present invention
Fig. 5 is that the present invention is used in the strong resolution chart of high field that 10mW base station and common antenna are used in the 500mW base station
Fig. 6 is that the present invention is used in the strong resolution chart of inferior high field that 10mW base station and common antenna are used in the 500mW base station
Fig. 7 is that the present invention is used in the 10mW base station and the effective CS of common antenna in the 500mW base station counts resolution chart
Fig. 8 is that the present invention is used in 10mW base station and common antenna and decides station error rate test figure in the 500mW base station
Embodiment
Below structure and the effect that invention will be further ex-plained with reference to the appended drawings
With reference to Fig. 1, the present invention is made up of following five parts:
1. array antenna 5,6
The dual polarization sector six array directional antennas that this array antenna is made up of three ± 45 ° polarisation unit, wherein:
Three array directional antennas 5 of-45 ° of polarization sectors are two-way uses, and sub-sequence carries out downlink to the signal after amplifying and upward signal is received on time;
Three array directional antennas 6 of+45 ° of polarization sectors are used for upward signal is received.
2. width of cloth phase controller 1
This width of cloth phase controller is finished amplitude and the phase control to the uplink and downlink signal.Receive omnidirectional's covering because the present invention adopts three sector dual polarization six array antennas to be combined to form, so width of cloth phase controller is made as by ± 45 ° of corresponding respectively two of connecting of polarization array directional antenna, each width of cloth phase controller is divided into three the tunnel and imports.
3. power amplifier 3
This power amplifier is mainly finished three kinds of functions, and the one, from the forward signal of base station, extract the transmitting-receiving control signal; The 2nd, the downstream signal of base station is carried out power amplification; The 3rd, the up weak signal that receives is carried out low noise amplify.
4. receive and dispatch isolator 2
This transmitting-receiving isolator is mainly used in isolates the receiving and transmitting signal of three array antennas of-45 ° of polarization of two-way use, and promptly firing cadence isolates transmitting from received signal during reception.
5. DC power supply 4
It is the direct voltage that each circuit uses in the system that this power supply is mainly finished the alternating current of the 220V of input or dc voltage conversion that far-end provides.
The annexation and the operation principle of above-mentioned each parts are as follows:
Three array directional antennas 5 of-45 ° of polarization sectors and the width of cloth controller 1, transmitting-receiving isolator 2, power amplifier 3 mutually are connected successively with DC power supply 3, wherein, receive and dispatch isolator 2 respectively with the width of cloth controller 1 and 3 two-way connections of power amplifier mutually.Three array directional antennas 6 of+45 ° of polarization sectors are connected with power amplifier 3 by another width of cloth phase controller 1.
During reception, dual polarization six array antennas are worked simultaneously, unite the reception upward signal.Three+45 ° polarization sector array directional antennas 6 will receive the upward signal of being sent by mobile phone, carrying out omnidirectional by width of cloth phase controller 1 synthesizes, and after the signal that receives carried out selectivity polarization diversity and receive, be input to power amplifier 3 and amplify, be input to the base station then.Three-45 ° polarization sector array antennas 5 also will receive the upward signal of being sent by mobile phone, being input to another width of cloth phase controller 1, to carry out omnidirectional synthetic, and after the signal that receives carried out selectivity polarization diversity and receives, be input to power amplifier 3 by transmitting-receiving isolator 2 and amplify, be input to the base station then.
During emission, just three-45 ° polarization sector array antennas, 5 work.After power amplifier 3 carries out power amplification to the downstream signal of little base station chronologically, be sent to width of cloth phase controller 1 by transmitting-receiving isolator 2, by width of cloth phase controller it is assigned to three-45 ° polarization sector array directional antennas, descending again forwarding, utilize the high-gain of directional antenna itself to form the theaomni-directional transmission covering, make mobile phone can receive the descending strong signal that transmit the base station in different azimuth.
With reference to Fig. 2, dual polarization of the present invention sector six array antennas are that three array directional antennas are connected into an integral body, fixing two arrays that constitute by ± 45 ° of poliarizing antenna unit 8 on each face, all active control units are arranged on this whole clear position, formation integrates the antenna structure of active control unit and three sector dual polarization sector array, receive noise factor to reduce the loss of feeder line, to reduce, improved snr of received signal.Described one antenna structure upper end is fixed with lightning arrester 7, and radio frequency feed line 9 and power line 10 are drawn from power amplifier and DC power supply respectively in the lower end.Described one antenna structure outside is with radome 11, constitutes the antenna product of a profile sealing, as shown in Figure 3.As long as two radio frequency feed lines 9 directly are connected with the base station, plugging in gets final product during installation.
With reference to Fig. 4, from the horizontal direction of test as seen, deviation in roundness of the present invention has reached omnidirectional's characteristic preferably less than ± 2.5dB.
With reference to Fig. 5～Fig. 8 as can be seen, use the present invention can be with the upgrading base station of 10mw effect to the 500mW base station.
Fig. 5 a is that common antenna is used in the strong coverage test of high field in 500mW base station
Fig. 5 b is the strong coverage test of high field that smart antenna of the present invention is used in the 10mW base station
In general, the minimum level of mobile phone connecting system is 26dB μ V in the Personal Handyphone System system, but in the requirement of reality, generally requires outdoor covering will reach about 40dB μ V, otherwise indoor window limit signal does not just reach the minimum access requirement of mobile phone.From Fig. 5 a as can be seen, use the high field in 500mW base station of common antenna to be worth major part by force and be in more than the 40dB μ V, coverage rate is 91.18%, and being in 30dB μ V to 40dB μ V is 7.84%.High field is worth the overwhelming majority by force and is in more than the 40dB μ V in the 10mW base station to use smart antenna of the present invention as can be seen from Fig. 5 b, and coverage rate is 99.31%.
As seen, the 500mW base station of using its strong coverage effect of high field of 10mW base station of smart antenna of the present invention to be better than using common antenna slightly.
Fig. 6 a is that common antenna is used in time strong coverage test of high field of 500mW base station
Fig. 6 b is the strong coverage test of inferior high field that smart antenna of the present invention is used in the 10mW base station
Because it is dynamic assignment that the Personal Handyphone System system adopts the channel allocation system, the covering number of plies of base station has determined
Can offer the number of subscriber channel, therefore, inferior strong covering is to analyze the covering Personal Handyphone System parameter that effectively offers subscriber channel.From Fig. 6 a as can be seen, time high field strength, 500mw base station of using common antenna is more than 40dB μ V, and coverage rate is 71.57%, and inferior high field is worth major part by force, and to be in 30dB μ V to 40dB μ VdB μ V be 26.47%.Use the strong value of 10mW base station time high field of smart antenna of the present invention to be in more than the 40dB μ V as can be seen from Fig. 6 b, coverage rate is 89.58%, and inferior high field is worth major part by force and is in more than 30dB μ V to the 40dB μ VdB μ V, and coverage rate is 9.72%.
Fig. 7 a is effective CS number test that common antenna is used in the 500mW base station
Fig. 7 b is effective CS number survey that smart antenna of the present invention is used in the 10mW base station
Effectively the CS number is meant and receives the base station number of field intensity value greater than 40dB μ V, because the Personal Handyphone System system
To adopt the channel allocation system be dynamic assignment, therefore, the covering number of plies of base station how much determined can offer user's channel number.From Fig. 7 a as can be seen, the effective CS number in 500mw base station that uses common antenna is 91.18 greater than 1 coverage rate.From Fig. 7 b as can be seen, the effective CS number in 10mW base station that uses smart antenna of the present invention is 99.31 greater than 1 coverage rate.
Fig. 8 a is to use the 500mW base station of the common antenna error rate test of standing surely
Fig. 8 b is to use the 10mW base station of the smart antenna of the present invention error rate test of standing surely
Difference from following as can be seen three aspects of contrast of 8a and 8b:
(1) on the error rate, use the error rate of the 10mW base station of smart antenna will hang down a bit slightly than the error rate of the 500mW base station of using common antenna.
(2) from covering effective range greater than 40dB μ V, using the coverage distance of the 10mW base station of smart antenna is 822 meters, and the coverage distance that uses the 500mW base station of common antenna is 782 meters.
(3) from comprehensive index, use the 10mW base station of smart antenna, surpassed the 500mW base station of using common antenna.
Claims (3)
1. the Personal Handyphone System PHS communication system omnidirectional intelligent aerial of a polarization diversity is characterized in that:
A. controller (1), transmitting-receiving isolator (2), power amplifier (3), power supply (4) are integrated as a whole mutually with three ± 45 ° polarization sector six array antennas and the width of cloth, to reduce feeder loss, reduce the reception noise factor;
B. described three ± 45 ° polarization sector six array antennas adopt three ± 45 ° polarization sector six array directional antennas, and form reception omnidirectional and cover, wherein:
Three+45 ° polarization sector array antennas (6) are used to finish upward signal and receive, the upward signal that is about to receive, after carrying out the synthetic and selectivity polarization diversity of omnidirectional and receive by width of cloth phase controller (1), obtain high-gain omnidirectional polarization diversity usefulness, ingoing power amplifier (3) is input to the base station after amplifying again, increase the up link receiving gain, keep the uplink and downlink link balance;
Three-45 ° polarization sector array antennas (5) are used to finish the two-way function that receives upward signal and converting downlink signal, promptly when receiving upward signal, unite reception with three+45 ° polarization sector array antennas (6), and with the upward signal that receives, after carrying out the synthetic and selectivity polarization diversity of omnidirectional and receive by another width of cloth phase controller (1), after amplifying, transmitting-receiving isolator (2) ingoing power amplifier (3) is input to the base station again; When converting downlink signal, after power amplifier (3) the descending power amplification to base station chronologically, enter width of cloth phase controller (1) through transmitting-receiving isolator (2) and be assigned to three descending forwardings of array directional antenna, form theaomni-directional transmission and cover.
2. omnidirectional intelligent aerial according to claim 1, it is characterized in that width of cloth phase controller (1), be made as corresponding two, each width of cloth phase controller is divided into three tunnel inputs, be connected with three-45 ° polarization sector array antennas with three+45 ° polarization sector array antennas respectively, finish the width of cloth of uplink and downlink signal is controlled mutually.
3. omnidirectional intelligent aerial according to claim 1, it is characterized in that receiving and dispatching isolator (2) respectively with the width of cloth controller (1) and two-way connection of power amplifier (3) mutually, the receiving and transmitting signal that is used to control three array antennas of right-45 ° of polarization sectors is isolated, promptly at firing cadence from received signal, isolate transmitting during reception.
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| CNB2004100260700A CN100336315C (en) | 2004-04-26 | 2004-04-26 | Polarization diversity PHS communication system omnidirectional intelligent antenna |
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| CNB2004100260700A CN100336315C (en) | 2004-04-26 | 2004-04-26 | Polarization diversity PHS communication system omnidirectional intelligent antenna |
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| CN1630219A true CN1630219A (en) | 2005-06-22 |
| CN100336315C CN100336315C (en) | 2007-09-05 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102082596A (en) * | 2009-11-30 | 2011-06-01 | 中国移动通信集团江苏有限公司 | Communication method and device based on dual-channel technology |
| CN101471495B (en) * | 2007-12-29 | 2011-07-13 | 京信通信系统（中国）有限公司 | Bundling antenna and encapsulation device thereof |
| CN102204110A (en) * | 2008-10-29 | 2011-09-28 | 高通股份有限公司 | Interface for wireless communication devices |
| CN101299858B (en) * | 2007-04-30 | 2011-11-30 | 大唐移动通信设备有限公司 | Signal processing device, method and intelligent antenna test system using said apparatus |
| CN101901962B (en) * | 2009-05-27 | 2014-03-26 | 财团法人工业技术研究院 | Radiation field type isolator as well as antenna system thereof and communication device using same |
| WO2015042968A1 (en) * | 2013-09-30 | 2015-04-02 | 华为技术有限公司 | Sector configuration method and device, and system |
| CN107437986A (en) * | 2013-07-15 | 2017-12-05 | 中兴通讯股份有限公司 | Full-duplex operation in wireless network |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000114848A (en) * | 1998-10-01 | 2000-04-21 | Yokowo Co Ltd | Diversity antenna |
| CN2730033Y (en) * | 2004-04-26 | 2005-09-28 | 西安海天天线科技股份有限公司 | Omnidirectional intelligent antenna of wireless local telephone PHS communication system |
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- 2004-04-26 CN CNB2004100260700A patent/CN100336315C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101299858B (en) * | 2007-04-30 | 2011-11-30 | 大唐移动通信设备有限公司 | Signal processing device, method and intelligent antenna test system using said apparatus |
| CN101471495B (en) * | 2007-12-29 | 2011-07-13 | 京信通信系统（中国）有限公司 | Bundling antenna and encapsulation device thereof |
| CN102204110A (en) * | 2008-10-29 | 2011-09-28 | 高通股份有限公司 | Interface for wireless communication devices |
| CN101901962B (en) * | 2009-05-27 | 2014-03-26 | 财团法人工业技术研究院 | Radiation field type isolator as well as antenna system thereof and communication device using same |
| CN102082596A (en) * | 2009-11-30 | 2011-06-01 | 中国移动通信集团江苏有限公司 | Communication method and device based on dual-channel technology |
| CN107437986A (en) * | 2013-07-15 | 2017-12-05 | 中兴通讯股份有限公司 | Full-duplex operation in wireless network |
| CN107437986B (en) * | 2013-07-15 | 2020-03-06 | 中兴通讯股份有限公司 | Full duplex operation in wireless networks |
| WO2015042968A1 (en) * | 2013-09-30 | 2015-04-02 | 华为技术有限公司 | Sector configuration method and device, and system |
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|---|---|
| CN100336315C (en) | 2007-09-05 |
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