CN1227835C - Apparatus for distributing/combining multi-beam in mobile communication system - Google Patents
Apparatus for distributing/combining multi-beam in mobile communication system Download PDFInfo
- Publication number
- CN1227835C CN1227835C CN 01804044 CN01804044A CN1227835C CN 1227835 C CN1227835 C CN 1227835C CN 01804044 CN01804044 CN 01804044 CN 01804044 A CN01804044 A CN 01804044A CN 1227835 C CN1227835 C CN 1227835C
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- module
- sector
- wave beam
- switch
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/24—Cell structures
- H04W16/28—Cell structures using beam steering
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
- H01Q1/246—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for base stations
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q25/00—Antennas or antenna systems providing at least two radiating patterns
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
- H04W16/06—Hybrid resource partitioning, e.g. channel borrowing
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/24—Cell structures
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
The present invention relates to an apparatus of dividing a multi-beam from a base station for several n sectors and combining vice versa in a mobile communication system. The present apparatus includes a multi-beam forming module consisting of n multi-beam forming means forming a received multi-beam from m antennas in a mobile communication system to m beams, which have different direction each other; a 180 DEG coupling module combining the (m x n) beams from the multi-beam forming module to (m x n)/2 beams; a switching module choosing each beam path of the beams from the 180 DEG coupling module; a 180 DEG phase shifting module shifting signal phase to strengthen a part of the beams outputted from the switching module; and a mixing module adapting characteristics of amplitude and phase of the beams while mixing them. According to the present invention, data traffic of a base station can be distributed equally among its n sectors.
Description
Technical field
The present invention relates to change based on the load of traffic of each sector the multi-beam distribution/composite set of mobile communication system of the service range of each sector.
Background technology
In mobile communication system, base station (BTS) is divided into two types, " omnidirectional " and " sector ".Yet most of base stations are " sector " types.In the BTS of a sectors type, its service area is divided into three or six sectors.The BTS of the sectors type of cdma system generally has 3 sectors.
The BTS of sectors type uses each sector to have the antenna of fixed beam width, thereby fixes the geographical coverage area of a sector.Yet the traffic is unbalanced in each sector of RTS usually.The distribution of frequency resource is enough to for the heaviest traffic of sectors process.Therefore, the efficient of frequency resource is low in the sector of a small amount of traffic, and in heavy traffic sector, the efficient of wireless channel can be reduced, and coverage can be reduced.So, in BTS with the unbalanced sector of the traffic with regard to the generation problem, as the management/maintenance cost of low efficiency of service and high-frequency resource.
In addition, if change in three sectors that are distributed in a BTS of load of traffic, and the sector has separately fixedly coverage, and such situation is handled with hand, and promptly operating personnel are rotatably installed in antenna on the head tower normally to adapt to the change that load of traffic is distributed.Yet, this manual work be danger close with heavy, it also is oversize that antenna is adjusted the time.As a result, manual maintenance is inefficient.
Summary of the invention
It is one object of the present invention that the multi-beam distribution/composite set of mobile communication system is provided, it arrives another sector with the beam allocation of a sector, adjusts and distributes each coverage of all sectors to guarantee traffic balance in the sector and the frequency resource of effectively using BTS based on load of traffic.
Characteristics according to a multi-beam distribution/composite set of mobile communication system of the present invention are that there is n sector a base station, and there is m wave beam each sector, it comprise multi-beam form module form (the individual wave beam of n * M), their radiation angle is different mutually; 180 ° of coupling module will from multi-beam form module (the individual beam combination of n * m) for (wave beam of n * m)/2, they each is distributed between 2 sectors; Switch module comprises ((n * m) one or a terminating load of wave beam that the individual switch element of n * m), they each are selected to be distributed; 180 ° of phase shift module move the (phase place of individual wave beam of n * m) of being distributed selectively; And a composite module is to each sector combination m/2 wave beam.
Characteristics according to another multi-beam distribution/composite set of mobile communication system of the present invention are that there is n sector a base station, there is m wave beam each sector, and it comprises a multi-beam formation module composition, and (n * m) their radiation angle of individual wave beam is different mutually; Switch module comprise switch element selectively multi-beam is formed module (in the individual beamformer output of n * m) (n * m)/2 a wave beam is connected respectively to 2 sectors; A coupling module comprises a plurality of sector couplers and a plurality of ordinary coupler, the combination of sector coupler without switch module (wave beam of n * m)/2 and through switch module (wave beam of n * m)/2, each ordinary coupler can make up 2 wave beams and the wave beam of the combination that distributes between two sectors from above-mentioned 2 switch elements; With a composite module, all outputs of the coupling module in each sector are made up.
Characteristics according to another multi-beam distribution/composite set of mobile communication system of the present invention are that there is n sector a base station, there is m wave beam each sector, and it comprises a coupling module coupling, and (n * m) individual wave beam produces the traffic estimation standard signal of each sector; Switch matrix module comprise (the individual switch element of n * m), they each can be connected to each input 2 sectors; The matrix module of a terminating comprises 2 * (the individual terminating switch element of n * m), an output or a terminating load of their each selector switch element; Composite module makes up all outputs from terminating switch matrix module concerning each sector; And control unit is based on the switching manipulation of independent control switch element of the estimation standard signal of the generation traffic and terminating switch element.
Multi-beam distribution/the composite set of mobile communication system make effectively the frequency of utilization resource and in all sectors by traffic balance, improve stability and conveniently keep.In this multi-beam distribution/composite set, the requisite number of switches of switch beam should be the least possible.So the stable operation that wave beam changes can obtain.
Description of drawings
Included accompanying drawing provides further understanding the present invention, and the concrete device that the present invention preferentially selects for use is described, together with explanation, is used for explaining principle of the present invention, wherein:
Fig. 1 is the beam modes according to the radiation of multi-beam distribution/composite set first embodiment of the present invention institute;
Fig. 2 is the block diagram according to first embodiment of multi-beam distribution/composite set of the present invention;
Fig. 3 is according to the fixedly sector of multi-beam distribution/composite set second embodiment of the present invention institute radiation and the wave beam of variable sector;
Fig. 4 is the block diagram according to second embodiment of multi-beam distribution/composite set of the present invention;
Fig. 5 is the block diagram according to the 3rd embodiment of multi-beam distribution/composite set of the present invention;
Fig. 6 is the more detailed block diagram of Fig. 5 multi-beam distribution/composite set.
Embodiment
In order fully to separate the present invention, its preferred embodiment can be illustrated now with reference to the accompanying drawings.
The first embodiment of the present invention at first is described.In first embodiment, 4 wave beams of each sector (three sector totally 12 wave beams) are combined into 2 wave beams, so, suitably based on traffic distribution altogether 6 wave beams can be assigned to one of three sectors.
Promptly form whole service coverage that 6 wave beams are used for BTS as shown in Figure 1, the direction of a sector and width are reallocated by wave beam and are adjusted.
According to Fig. 2 of the present invention is the block diagram of first embodiment of multi-beam distribution/composite set.The device of Fig. 2 comprises multi-beam and forms 102, one 180 ° of coupling modules of module 104,106, one 180 ° of phase shift modules 108 of switch module and a composite module 110.
Multi-beam forms module 102 and forms 12 wave beams, and their radiation angle is different mutually, and it comprises that 3 multi-beams form device and are used for three sectors as shown in Figure 2.4 RF wave beams from each multi-beam formation device output are applied to 2 180 ° of couplers of 180 ° of coupling modules 104.
180 ° of coupling modules 104 comprise 6 180 ° 12 RF beam combination are become 6, and promptly 180 of 180 ° of coupling modules 104 ° of couplers become one with 2 RF beam combination.Each 180 ° of coupler has 2 output signal paths, and the port to its original sector connects, and another signal port to another sector connects.
According to first embodiment of multi-beam distribution/composite set, 6 wave beams can be assigned to a sector rather than their original sector, distribute in order to adapt to the load of traffic that changes in 3 sectors separately, thereby can reach maximum wireless channel efficient.
Now the second embodiment of the present invention is explained.In second concrete device, 4 wave beams of each use (three sectors amount to 12 wave beams) to 3 sectors, 2 adaptive beam that 4 wave beams are fixing by 2 and 2 wave beams that can change the sector are formed (to call " adaptive beam " in the following text) each sector can be redistributed to other sectors, and adaptation is based on traffic distribution.
Promptly forming 12 wave beams is used for the whole coverage of a BTS 6 wave beam A2, A3, B2, B3, C2 and C3 is fixed to their original sectors there, other 6 wave beam A1, A4, B1, B4, C1 and C4 can change between the sector, as shown in Figure 3.Therefore the direction of a sector and width are reallocated by adaptive beam and are adjusted.
Fig. 4 is second embodiment according to multi-beam distribution/composite set of the present invention.The device of Fig. 4 comprises multi-beam and forms module 402, switch module 404,180 ° of coupling modules 406 and a composite module 408.
The switch module 404 of second embodiment has 6 switches, and configuration is used for 6 wave beam A4, B1, B4, C1, C4 and A1, and these 6 beam configuration are as initial level " can change the sector ".Each switch in the switch module 404 receives the adaptive beam that forms module 402 from multi-beam, and it is connected with other sectors to original or original.
Each switch in the switch module 404 comprises two outputs and a terminating load.An output is fixedly attached to input, and another internal control signal of exporting according to external control signal or switch module 404 is connected to input or terminating load selectively.That is, each switch only forms the single beampath towards the output of its original sector, or towards two paths of its sector and another sector.In other words, when connecting switch, each switch can be used as 2 distributors, and when switch cuts off, just as the simple beam path.
Work in pairs with the switch that beam port A1, A4, B1, B4, C1 and C4 link to each other.In other words, in switching manipulation, two switch, A4 and B1, B4 and C1 or C4 and A1 coupling.For example, two switches of A4 and B1 end are simultaneously for cut-out, or when one of them was cut-out, another switch was for connecting.That is, each coupling of switch makes not have the path to lead to other sectors, and perhaps externally under the control of the inside ON/OFF control signal of ON/OFF control signal or switch module 404, making only has individual paths to lead to other sectors.
The coupler of each 180 ° of coupling module 406 comprises two inputs and two or one (another terminating) output, and it with the phase shift of diagonal input 180 °, and subsequently itself and direct input are made up.
The operation of second embodiment explanation that will give the account in greater detail.
When the coupling of switch A4 and B1 is all cut off, just can not be established to the beampath of other sectors, therefore, these two self adaptation modulus A4 and B1 and their original sector are fixing respectively.If the coupling of switch is all cut off, so, sector type BTS just has 12 fixed beams as tradition.
When this switch A4 of two is logical, and other B1 are for disconnected, and wave beam A4 is distributed by switch A4, and this switch is as No. 2 combiners, and wave beam A4 offers two 180 ° of couplers simultaneously, i.e. 180 of sector 1 ° of couplers and be placed on common 180 ° of couplers between sector 1 and 2.The wave beam A4 of 180 ° of couplers that imposes on sector 1 is by 180 ° of phase shifts, and can not produce phase shift in imposing on the wave beam A4 of common 180 ° of couplers.Therefore, the wave beam A4 through distributing in the combiner of sector 1 through mixing mutually, so that wave beam A4 in sector 1, do not occur with disappearing.
Simultaneously, impose on common 180 ° of couplers through distribute wave beam A4 in output place that is connected with sector 2 by 180 ° of phase shifts, and be input to the combiner of sector 2 subsequently.The wave beam B1 and other wave beams that have 180 ° of phase shifts in the wave beam A4 of 180 ° of phase shifts and sector 2 make up in the combiner of sector 2.Therefore, wave beam A4 from the sector 1 reallocation give sector 2, that is, widened the coverage of sector 2.
Be similar to the above-mentioned operation of explaining, during another switch connection, wave beam A4 and B1 make up in the combiner of sector 1, like this, just wave beam B1 are reallocated to sector 1 when switch A4 cuts off and among both.Detailed explanation to this situation will be ignored, because this is known by those skilled in the art.
Operation according to second embodiment of multi-beam distribution/unit equipment, 6 wave beams in 12 wave beams can be distributed to a sector except that they original sector respectively, distribute with the traffic load that adapts in 3 sectors, just can make the maximizing efficiency of wireless channel thus.
Now, will explain the third embodiment of the present invention.In the 3rd embodiment, 4 wave beams (summation is exactly 12 wave beams for 3 sectors) of each sector are used in 3 sectors, and 12 all wave beams can change the sector, and therefore, they can distribute according to communication and be redistributed to other sectors adaptively.
Fig. 5 is the block diagram according to the 3rd embodiment of multi-beam distribution/unit equipment of the present invention.The equipment 500 of Fig. 5 comprises directional couple module 502, switch matrix module 504, terminating switch matrix module 506, beam combination module 508 and control unit 600.
Terminating switch matrix module 506 will be connected to its output from the signal of switch matrix module 504, and perhaps, if there is no signal just interrupts.It also mates the characteristics of signals between switch matrix module 504 and the beam allocation/composite module 508.
508 pairs of multi-beams of beam allocation/composite module that configuration is used for 3 sectors are distributed/make ups, and coupling sends to BTS system (not shown) and the reception characteristics of signals from the BTS system.
Both operations of control unit 600 control switch matrix modules 504 and terminating switch matrix module 506, and keep monitoring to their on off states.
Fig. 6 is the detailed diagram of Fig. 5 multi-beam distribution/unit equipment 500.As shown in Figure 6,502 pairs of 12 wave beams from 12 inputs that link to each other with 3 antenna arrays of directional couple module are coupled, and producing the aforesaid standards signal, and these 12 wave beams are connected to switch matrix module 504.
Terminating switch matrix module 506 comprises 24 terminating switches, and they mate the characteristics of signals between switch matrix module 504 and the beam allocation/composite module 508 under the control of control unit 600.Each switch of terminating switch matrix module 506 has two inputs, and in them one links to each other with switch matrix module 504, and another input links to each other with terminating load.Like this, the output of each terminating switch is connected to the respective switch of switch matrix module 504, if its output signal, or under the control of control unit, would be connected to terminating load.Be not only in order to mate the impedance in switch matrix module 504, terminating switch matrix module 506 and the beam allocation/composite module 508 to the switch of terminating load, and prevent that unwanted noise from flowing into system.
As by the explanation of all elements of the equipment in Fig. 5 and 6 500 is understood, the traffic load of each sector is based on the signal from coupling path that is extracted by directional couple module 502 to be estimated, and judges how to distribute/combining multi-beam according to the traffic load of each estimated sector.Subsequently, control unit 600 is by setting all signal paths by switch matrix module 504 and terminating switch module 506 according to determined multi-beam distribution/assembled scheme control concrete signal path switch separately.Carry out the concrete variation of sector by the concrete signal path that control unit 600 is set.
Concerning the various modifications and variations that embodiment did explained for apparent the those skilled in the art, for example, the variation of the variation of the variation in the wave beam number, number of sectors and 12 constructions of switch does not deviate from spirit of the present invention or category.Like this, just wish that the present invention can cover all modifications and variations to it, these modifications and variations that provided are included in the category of accessory claim and their equivalent.
Claims (14)
1, a kind of multi-beam distribution/unit equipment of mobile communication system, the base station in the described system has n sector, and each sector has m wave beam, it is characterized in that, and described equipment comprises:
Multi-beam forms module, forms n * m the wave beam that radiation angle differs from one another;
180 ° of coupling modules, will become from n * m beam combination that multi-beam forms module (wave beam of n * m)/2, each wave beam distributes between two sectors;
Switch module is made up of n * m switch element, and each element is selected or terminating load in n * m wave beam of distribution;
180 ° of phase shift block selectively will be through n * m wave beam phase shift of distribution; And
Composite module makes up m/2 wave beam of each sector.
2, equipment as claimed in claim 1 is characterized in that, described 180 ° of coupling modules distribute each through the combination wave beam between original sector and another sector.
3, equipment as claimed in claim 1 is characterized in that, described switch module will through combination (each wave beam in the wave beam of n * m)/2 is selected and recommended single sector.
4, equipment as claimed in claim 1 or 2 is characterized in that, described 180 ° of phase shift block are n * m the wave beam phase shift through distributing of half, and they are made up mutually longways with second half wave beam from other sectors.
5, a kind of multi-beam distribution/unit equipment of mobile communication system, the base station in the described system has n sector, and each sector has m wave beam, it is characterized in that, and described equipment comprises:
Multi-beam forms module, forms n * m the wave beam that radiation angle differs from one another;
Switch module is made up of switch element, selectively multi-beam is formed in n * m the beamformer output of module (n * m)/2 a wave beam links to each other with two sectors respectively;
Coupling module, constitute by a plurality of sectors coupler and a plurality of ordinary coupler, the sector coupler will be not by described switch module (wave beam of n * m)/2 and by described switch module (n * m)/2 a wave beam makes up, each ordinary coupler can be from two beam combination of described two switch elements, and the wave beam through combination is distributed between two sectors; And
Composite module can make up all outputs of the coupling module in each sector.
6, equipment as claimed in claim 5, it is characterized in that, described coupling module constantly will be directly from described multi-beam form module (n * m)/2 a wave beam sends each original sector to, and can (n * m)/2 a wave beam sends original sector and other sectors simultaneously to other.
7, equipment as claimed in claim 5, it is characterized in that, described coupling module does not send a wave beam through distributing to original sector via each switch element with having phase change, and send another to original sector through distributing wave beam through 180 ° of phase shifts, and with described previous through distributing wave beam to send other sector to through 180 ° of phase shifts.
8, as claim 5 or 7 described equipment, it is characterized in that when applying start signal, described switch element will be imported wave beam and output to sector coupler and ordinary coupler simultaneously, and when applying shutdown signal, will import wave beam and only be connected to the sector coupler.
9, equipment as claimed in claim 5 is characterized in that, described composite module further to the wave beam on each signal path that forms module from described multi-beam they amplitude and phase characteristic on match each other.
10, a kind of multi-beam distribution/unit equipment of mobile communication system, the base station in the described system has n sector, and each sector has m wave beam, it is characterized in that, and described equipment comprises:
Coupling module is coupled n * m wave beam to produce the communication estimation standard signal of each sector;
The switch matrix module is made up of n * m switch element, and each element can be connected to each input two sectors;
Terminating switch matrix module, (n * m) individual terminating switch element is formed, and each element is selected an output or terminating load of described switch element by 2x;
Composite module will make up from all outputs of described terminating switch matrix module for each sector; And
Control unit is estimated standard signal according to the communication that is produced, and the operation of described switch element and terminating switch element is controlled separately.
11, equipment as claimed in claim 10 is characterized in that, each switch element is established to the beampath of original sector or another sector according to the switch control of described control unit.
12, equipment as claimed in claim 10 is characterized in that, according to the switch control of described control unit, described each terminating switch element is set up the input of beampath or interrupt groups compound module between described switch element and composite module.
13, equipment as claimed in claim 10 is characterized in that, connects terminating load, so that prevent that by the beampath that cuts off between described switch matrix module and the composite module noise of not expecting from flowing into.
14, equipment as claimed in claim 10 is characterized in that, described composite module mates to the characteristics of signals that sends to base station system and from the characteristics of signals that base station system receives.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2000/70207 | 2000-11-24 | ||
| KR1020000070207A KR100360007B1 (en) | 2000-11-24 | 2000-11-24 | Apparatus for distributing a multi beam in a mobile system |
| KR2000/70208 | 2000-11-24 | ||
| KR1020000070208A KR100360008B1 (en) | 2000-11-24 | 2000-11-24 | Apparatus for distributing a multi beam in a mobile system |
| KR2000/70688 | 2000-11-25 | ||
| KR1020000070688A KR100360009B1 (en) | 2000-11-25 | 2000-11-25 | Apparatus for hybrid distributing a multi beam in a mobile system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1397111A CN1397111A (en) | 2003-02-12 |
| CN1227835C true CN1227835C (en) | 2005-11-16 |
Family
ID=27350361
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01804044 Expired - Fee Related CN1227835C (en) | 2000-11-24 | 2001-11-24 | Apparatus for distributing/combining multi-beam in mobile communication system |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP1336260A4 (en) |
| JP (1) | JP4043361B2 (en) |
| CN (1) | CN1227835C (en) |
| AU (1) | AU783735B2 (en) |
| WO (1) | WO2002043278A1 (en) |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003017418A1 (en) * | 2001-08-14 | 2003-02-27 | Redline Communications Inc. | Distribution system for antenna array |
| US20050146463A1 (en) * | 2001-09-13 | 2005-07-07 | Calin Moldoveanu | Method and apparatus for beam steering in a wireless communications system |
| WO2003023897A1 (en) * | 2001-09-13 | 2003-03-20 | Redline Communications Inc. | Method and apparatus for beam steering in a wireless communications systems |
| KR100957318B1 (en) * | 2004-11-24 | 2010-05-12 | 삼성전자주식회사 | Method amd apparatus for transmission and allocating resource in a multi-carrier system |
| US20070275761A1 (en) * | 2006-05-24 | 2007-11-29 | Navini Networks, Inc. | Dynamic cell control through antenna radiation pattern synthesis |
| KR101118919B1 (en) * | 2009-07-27 | 2012-02-27 | 주식회사 에이스테크놀로지 | Base station antenna device with built-in transmitting and receiving module |
| JP4896196B2 (en) | 2009-10-01 | 2012-03-14 | 株式会社エヌ・ティ・ティ・ドコモ | Cooperative transmission method, cooperative transmission system, aggregation station, and radio base station |
| GB2475304A (en) * | 2009-11-16 | 2011-05-18 | Niall Andrew Macmanus | A modular phased-array antenna |
| KR101686904B1 (en) * | 2014-12-26 | 2016-12-19 | 주식회사 굿텔 | Twin beam controller for antenna and antenna device using the same |
| CN106848608B (en) * | 2017-01-25 | 2020-03-17 | 东南大学 | Broadband mixed beam forming integrated antenna array |
| US10598778B2 (en) * | 2017-11-29 | 2020-03-24 | National Chung Shan Institute Of Science And Technology | Phase controller and phase controlling method for antenna array, and communication apparatus using the same |
| CN110994203B (en) * | 2019-11-25 | 2022-04-01 | 广东博纬通信科技有限公司 | Broadband mixed multi-beam array antenna |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62169505A (en) * | 1986-01-22 | 1987-07-25 | Toshiba Corp | Circular array antenna system |
| US5021801A (en) * | 1989-09-05 | 1991-06-04 | Motorola, Inc. | Antenna switching system |
| ZA95797B (en) | 1994-02-14 | 1996-06-20 | Qualcomm Inc | Dynamic sectorization in a spread spectrum communication system |
| US5844139A (en) * | 1996-12-30 | 1998-12-01 | General Electric Company | Method and apparatus for providing dynamically variable time delays for ultrasound beamformer |
| US5889494A (en) * | 1997-01-27 | 1999-03-30 | Metawave Communications Corporation | Antenna deployment sector cell shaping system and method |
-
2001
- 2001-11-24 CN CN 01804044 patent/CN1227835C/en not_active Expired - Fee Related
- 2001-11-24 WO PCT/KR2001/002031 patent/WO2002043278A1/en active IP Right Grant
- 2001-11-24 JP JP2002544884A patent/JP4043361B2/en not_active Expired - Fee Related
- 2001-11-24 EP EP01997908A patent/EP1336260A4/en not_active Withdrawn
- 2001-11-24 AU AU23152/02A patent/AU783735B2/en not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| WO2002043278A1 (en) | 2002-05-30 |
| CN1397111A (en) | 2003-02-12 |
| EP1336260A4 (en) | 2009-01-21 |
| JP4043361B2 (en) | 2008-02-06 |
| AU783735B2 (en) | 2005-12-01 |
| JP2004515111A (en) | 2004-05-20 |
| EP1336260A1 (en) | 2003-08-20 |
| AU2315202A (en) | 2002-06-03 |
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