CN1376364A - Method and apparatus for providing forward link softer handoff in a code division multiple access communication system - Google Patents
Method and apparatus for providing forward link softer handoff in a code division multiple access communication system Download PDFInfo
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- CN1376364A CN1376364A CN00813484.7A CN00813484A CN1376364A CN 1376364 A CN1376364 A CN 1376364A CN 00813484 A CN00813484 A CN 00813484A CN 1376364 A CN1376364 A CN 1376364A
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000004891 communication Methods 0.000 title abstract description 8
- 238000003491 array Methods 0.000 claims abstract description 17
- 239000011159 matrix material Substances 0.000 claims description 8
- 230000010267 cellular communication Effects 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 2
- 230000005855 radiation Effects 0.000 abstract 2
- 241000264877 Hippospongia communis Species 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 5
- 230000008859 change Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 3
- 230000006872 improvement Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/06—Reselecting a communication resource in the serving access point
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/16—Performing reselection for specific purposes
- H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection
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- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
A method and apparatus for providing forward link softer handoff in a code division multiple access communication system comprises utilizing spatially diverse antenna arrays and rerouting a softer handoff talk channel from a radiation pattern (415) of a first antenna array (404) into a radiation pattern (417) of a second antenna array (406).
Description
Technical field
The present invention relates to communication system, the method and apparatus that provides forward link softer to switch with the aerial array that comprises narrow beam antenna in a code division multiple access (CDMA) communication system is provided.
Background technology
Cellular communication system generally includes one or more mobile radio stations or unit, one or more base stations and a MTSO.Though three honeycombs 14 and two mobile radio stations 11 only are shown among Fig. 1, typical cellular network may comprise a hundreds of base station, thousands of mobile radio stations and more than one MTSO.Each honeycomb all is assigned one or more Dedicated Control Channel and one or more voice channel.In country, antenna pylon 12 is positioned at the center of honeycomb 14 usually, thereby omnidirectional covering is provided.In an omnidirectional honeycomb, control channel and dynamic voice channel are broadcasted in the whole zone of honeycomb by single antenna usually.In the occasion of the intensive setting in base station, can adopt subregion antenna system such in the prior art shown in Figure 2.Subregion requires directional antenna 20 to have for example antenna pattern of 120 degree as shown in Figure 2.Each sector 22 has a honeycomb with its control channel and Traffic Channel of one's own.＂ channel ＂ can represent a concrete carrier wave/ripple crack combination in the hybrid TDMA/FDMA system of concrete carrier frequency, for example IS-54 and a GSM in the analogue system, perhaps the concrete PN sign indicating number in cdma system of IS-95 for example.
Existing narrow beam antenna array is produced the wave beam of a sector of some coverings usually, and this narrow beam antenna array comprises the uniform linear array row, has the passive wave beam that dipole or plug-in units and formation comprise the network of Butler matrix.For example, common have comprise four 30 the degree wave beams and cover one 120 the degree sector or the zone four beam patterns.These wave beams have the roughly wave beam overlapping of negative 4dB usually, and wherein fan antenna has the wave beam overlapping of approximate negative 8dB usually.Therefore, wave beam in a narrow beam antenna directional diagram is overlapping significantly greater than overlapping to the sector of the sector in a subregion antenna pattern to wave beam, even overlapping also greater than overlapping to the sector of the sector in a subregion antenna pattern at the wave beam of two narrow beam antenna edge parts.
In utilizing the cdma system of narrow beam antenna, the interference of forward chaining production in beam overlap area of adjacent beams.The beam overlap area of existing narrow beam antenna structure face is greater than the beam overlap area territory of existing separate antennas because when using the passive RF wave beam that forms Butler matrix for example for the control of this wave beam seldom.As mentioned above, it is negative 4dB that the typical wave beam in a narrow beam antenna directional diagram overlaps approximate to wave beam, and fan antenna can be done to such an extent that the sector that occupies than them is narrower, and it is to bear 8dB that wave beam overlaps approximate.Because degree is more overlapping, therefore more regression is arranged.In addition, if the CDMA PN sign indicating number that narrow beam antenna is used to separate (promptly a wave beam is used for a present sector or PN) unless use softer handoff to switch, will mean that bigger bad change is arranged in the forward chaining otherwise be somebody's turn to do add overlapping.
The scheme that solving bad change increases problem is by all specifying and send talk channel on two wave beams, and this mobile radio station is set to the softer handoff switching state.Softer handoff switches and then adds some path diversity, and improvement should be moved and be received, and realizes the transmit power allocations of reduction.Utilize fan antenna, bigger spatial separation is removed the correlation in two paths, and the diversity gain compensation is done in overlapping bad change.Yet, if two wave beams are the fan antennas that come from single narrow beam antenna configuration rather than come from the conventional system of apart, then wave beam is asked will have higher correlation, and the path diversity income of generation is little, and causes the demand of higher transmit power allocations.So, need a kind of improved method and apparatus, be used for providing forward link softer to switch at the cdma communication system that uses aerial array.
Description of drawings
Illustrated the novelty of be sure oing feature of the present invention in the appending claims.Yet invention itself and best use pattern, further purpose and advantage will obtain best understanding in conjunction with the accompanying drawings the detailed description of exemplary embodiment subsequently: wherein:
Fig. 1 is the schematic plan view of the omnirange honeycomb antenna pattern in the prior art;
Fig. 2 is the schematic plan view of the subregion honeycomb antenna pattern in the prior art;
Fig. 3 illustrates the schematic diagram as a talk channel in the softer handoff switching of two adjacent beams utilizing narrow beam antenna in the prior art;
Fig. 4 illustrates the application schematic diagram according to space diversity narrow beam antenna of the present invention, softer handoff handoff calls channel is routed to the different diversity channels of adjacent beams;
Fig. 5 A-5B illustrates phased array is formed a kind of discrete orientation antenna of possibility of narrow beam antenna or the application schematic diagram of bay; And
Fig. 6 illustrates the method logical flow chart of the method according to this invention and system, provides forward link softer to switch in utilizing the cdma communication system of spatial diversity antennas.
Embodiment
Description is especially described the present invention with reference to figure 3, wherein, in the softer handoff that utilizes two adjacent beams switches a talk channel 302 is arranged; The wave beam A of narrow beam antenna 304 and B are identical with situation in the prior art.Narrow beam antenna 304 comprises the even linear antenna arrays of Butler matrix 316 and antenna oscillator 320-326.As Fig. 3 finding, talk channel 302 is connected to change over switch 306, and it is connected respectively to transmitter 308-314.Those skilled in the art will appreciate that by the signal from one of transmitter 308-314 is routed to Butler matrix 316 to form an antenna pattern, wherein this signal is assigned to antenna oscillator 320-326 subsequently.For example, the signals that sent by transmitter 308 and 310 will be as the directional diagram of wave beam A and B so that produce respectively by Butler matrix 316 and antenna oscillator 320-326 phasing and distribution.Form each of other wave beam (C and D) in a similar manner.When two adjacent beams, when for example a mobile radio station in the beam overlap area territory between wave beam A and the B requires softer handoff to switch to second wave beam, talk channel 302 is routed to the transmitter 308 and 310 that is connected with narrow beam antenna 304 by change over switch 306, produce beam pattern A and B, thus this mobile radio station is positioned within two adjacent beams of this narrow beam antenna 304.Yet because wave beam A and B come from single narrow beam antenna structure face, so this wave beam has higher correlation, thereby the path diversity income that produces is little and cause higher transmit power allocations demand.
According to a most preferred embodiment of the present invention, Fig. 4 illustrates the application of spatial diversity antennas array 404 and 406, comprises antenna pattern 415 routes of this softer handoff switching channels 402 from first aerial array 404 are transformed into the antenna pattern 417 of second aerial array 406.As Fig. 4 finding, talk channel 402 is connected to softer handoff switched router 430, and router four 30 is connected respectively to the first aerial array transmitter 440-446 and the second aerial array transmitter 448-454.Router four 30 comprises first conversion equipment 432 and second conversion equipment 434.When between two wave beams with an array, when for example a mobile radio station in the beam overlap area territory of the first aerial array adjacent beams A and B requires softer handoff to switch to second wave beam, talk channel 402 is transformed into the transmitter 440 of first aerial array and the transmitter 450 of second aerial array by the router route, transmitter 440 and 450 is connected respectively to from the antenna oscillator 420-423 of Beam-former 416 correct phasings and from the antenna oscillator 424-427 of Beam-former 419 correct phasings, therefore effectively softer handoff switching channels 402 is transformed into the antenna pattern B of second aerial array 406 from the antenna pattern B route of first aerial array 404.In the adjacent beams of this example, the antenna pattern of the aerial array that separates by usage space alternately rather than use the antenna pattern of same array to carry out softer handoff to switch, two diversity paths seldom are correlated with, thereby have improved this diversity gain.
As Fig. 4 finding, first aerial array 404 is used to send more than first antenna pattern 415 (A, B, C, D) that limits first coverage.Preferably, first aerial array 404 comprises the passive wave beam that forms network 416 and the even antenna oscillator 420-423 of linear antenna arrays 418.In this most preferred embodiment, antenna oscillator 420-423 comprises plug-in units or dipole.Although first aerial array of describing 404 comprises a narrow beam antenna array of being made up of passive wave beam that forms network and even linear antenna arrays, but it will be understood by those skilled in the art that it is easy using other structure under the condition that does not deviate from spirit and scope of the invention.For example Fig. 5 A is shown like that, can use a plurality of discrete directional antennas, for example fan antenna or parabolic antenna and do not use the passive beam antenna of linear antenna arrays combination of the formation network shown in Fig. 4/evenly.Similarly, the passive wave beam of the formation network 416 shown in Fig. 4 can be replaced with active electronic gain shown in Fig. 5 B and phase weighting and get and become the array of a linearity or annular.
Be used to send more than second antenna pattern 417 (A, B, C, D) that limits second coverage with reference to figure 4, the second aerial arrays 406 again.As above-mentioned discussion about first aerial array, in this most preferred embodiment, second aerial array 406 comprises the passive wave beam that forms network 419 and the even antenna oscillator 424-427 of linearly disposed antenna array 428.In this most preferred embodiment, first and second overlapped coverages, and first aerial array 404 and second aerial array, the 406 spaces predetermined distance of being separated by, in this most preferred embodiment, this preset distance is about 10 to 15 feet.In this most preferred embodiment, the passive wave beam that forms network 419 comprises the Butler matrix, and evenly linear antenna arrays 428 comprises a plurality of antenna oscillators 420, and in this most preferred embodiment, antenna oscillator 420 comprises plug-in units or dipole.Although second aerial array of describing 406 comprises a narrow beam antenna array of being made up of passive wave beam that forms network and even linear antenna arrays, but it will be understood by those skilled in the art that it is easy using other structure under the condition that does not deviate from spirit and scope of the invention.For example Fig. 5 A illustrate like that, can use a plurality of discrete directional antennas, for example fan antenna or parabolic antenna and do not use the passive beam antenna of linear antenna arrays combination of the formation network shown in Fig. 4/evenly.Similarly, the passive wave beam of the formation network 419 shown in Fig. 4 can be replaced with active electronic gain shown in Fig. 5 B and phase weighting and get and become the array of a linearity or annular.
In this most preferred embodiment, each of first and second aerial arrays all comprises a narrow beam antenna, and each of more than first and second antenna pattern all comprises more than first adjacent beams and more than second adjacent beams respectively.But, it will be understood by those skilled in the art that and under the condition that does not deviate from spirit and scope of the invention, can use other aerial array configuration and other antenna pattern.In addition, as the skilled person will appreciate, when using two or more carrier waves, replace frequency and can be set at and replace on the antenna structure face, and the 3rd carrier wave can be separated two channel distances, therefore realize more high efficiency combination of frequency.In this case, the present invention still provides two aerial arrays that cover same zone, thereby tolerance frequency f1, f3, f5 or the like are arranged on the main structure face, and frequency f 2, f4, f6 or the like are arranged on the diversity structure face.
With reference to figure 6, what wherein describe is a logical process flow chart according to the inventive method and system, and this handling process provides the forward link softer in having a cdma communication system of spatial diversity antennas to switch.As shown in the figure, this processing starts from frame 600, and wherein the step of transmitting of Zhi Hanging limits more than first antenna pattern of first coverage from the emission of first aerial array.Subsequently, shown in figure center 602, the step of transmitting of execution is from launching more than second antenna pattern that limits second coverage, this first and second overlapped coverage with second aerial array of the first aerial array apart.Subsequently, shown in figure center 604, the route switch process of execution converts a softer handoff switching channels to the antenna pattern of second aerial array from the antenna pattern route of first aerial array.
Foregoing has been introduced the most preferred embodiment of invention from the purpose of illustration and description.These explanations and description are not intended to limit the present invention or limit the invention to disclosed clear and definite form.Obviously might do improvement or variation according to above-mentioned giving advice.Selection and the embodiment that describes provide the best illustration of the principle of the invention and its practical application, and make those skilled in the art use invention and to make various modifications to be fit to specific use consideration with various embodiment.When explaining according to fair, legal and reasonable proposition, all this modifications and variations all be included in by appending claims determine of the present invention within.
Claims (18)
1. a kind of device that provides forward link softer to switch in a CDMA cellular communication system comprises:
First aerial array is used to send more than first antenna pattern that limits first coverage;
Second aerial array is used to send more than second antenna pattern that limits second coverage, and this first and second overlapped coverage, this first and second aerial array are the aerial arrays of apart; And
Be coupled to a softer handoff switched router of this first aerial array and this second aerial array, this softer handoff switched router is used for a softer handoff switching channels is transformed into from the antenna pattern route of this first aerial array the antenna pattern of this second aerial array.
2. device as claimed in claim 1, what it is characterized in that this first aerial array and this second aerial array comprises one of at least a plurality of antenna oscillators and the Beam-former that is used to produce a plurality of adjacent beams.
3. device as claimed in claim 2 is characterized in that this softer handoff switched router is used to this softer handoff switching channels is routed to from the antenna pattern of first aerial array adjacent beams of second aerial array.
4. device as claimed in claim 2 is characterized in that this Beam-former comprises a Butler matrix.
5. device as claimed in claim 2 is characterized in that these a plurality of antenna oscillators further comprise an even linear antenna arrays.
6. device as claimed in claim 5 is characterized in that this even linear antenna arrays comprises one of a plurality of plug-in units and a plurality of dipoles.
7. device as claimed in claim 1 is characterized in that this first aerial array and this second aerial array comprise one of at least a plurality of directional antennas.
8. be used for providing a CDMA cellular communication system a kind of method of forward link softer switching, the method comprising the steps of:
Limit more than first antenna pattern of first coverage from one first aerial array emission;
Send more than second antenna pattern that limits second coverage, this first and second overlapped coverage from second aerial array with the first aerial array apart; With
A softer handoff switching channels is transformed into the antenna pattern of second aerial array from the antenna pattern route of first aerial array.
9. method as claimed in claim 8, the step that it is characterized in that launching more than first antenna pattern comprise and send more than first adjacent beams, and the step of launching more than second antenna pattern comprises more than second adjacent beams of emission.
10. method as claimed in claim 8 is characterized in that the step of route conversion comprises the adjacent beams that the softer handoff switching channels is transformed into second aerial array from the antenna pattern route of first aerial array.
11. method as claimed in claim 8 is characterized in that when using two or more carrier wave, is included in to replace the step that alternating frequency is set on the array.
12., it is characterized in that when using the 3rd carrier wave, comprising the step of two channel distances of the 3rd carrier separation as the method for claim 11.
13. a kind of device that provides forward link softer to switch in a CDMA cellular communication system comprises:
First aerial array is used to send more than first antenna pattern that limits first coverage, and this more than first antenna pattern comprises more than first adjacent beams;
Second aerial array, be used to send more than second antenna pattern that limits second coverage, this more than second antenna pattern comprises more than second adjacent wave beam, and this first and second overlapped coverage, this first and second aerial array are the aerial arrays of apart; And
Be coupled to a softer handoff switched router of this first and second aerial array, this softer handoff switched router is used for a softer handoff switching channels is transformed into from a wave beam route of this first aerial array an adjacent beams of this second aerial array.
14. as the device of claim 13, what it is characterized in that this first aerial array and this second aerial array comprises one of at least a plurality of antenna oscillators and the Beam-former that is used to produce a plurality of adjacent beams.
15., it is characterized in that this Beam-former comprises a Butler matrix as the device of claim 14.
16., it is characterized in that these a plurality of antenna oscillators further comprise an even linear antenna arrays as the device of claim 14.
17., it is characterized in that this even linear antenna arrays comprises one of a plurality of plug-in units and a plurality of dipoles as the device of claim 16.
18., it is characterized in that this first aerial array and this second aerial array comprise one of at least a plurality of directional antennas as the device of claim 13.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US42623399A | 1999-10-22 | 1999-10-22 | |
| US09/426,233 | 1999-10-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1376364A true CN1376364A (en) | 2002-10-23 |
Family
ID=23689913
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN00813484.7A Pending CN1376364A (en) | 1999-10-22 | 2000-10-14 | Method and apparatus for providing forward link softer handoff in a code division multiple access communication system |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP1226723A4 (en) |
| CN (1) | CN1376364A (en) |
| WO (1) | WO2001031941A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014056197A1 (en) * | 2012-10-12 | 2014-04-17 | 华为技术有限公司 | Method, apparatus and base station for improving user capacity in physical sector |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1444852B1 (en) * | 2001-11-15 | 2016-05-25 | Metave Asset Holdings, LLC | Method for providing cell contouring in a communication network |
| FR2855929A1 (en) * | 2003-06-03 | 2004-12-10 | Nortel Networks Ltd | Access network node for covering mobile telecommunication zone, has controller releasing free passages of one multitude communication channel to another channel and from latter channel to former channel, for mobile |
| US8369424B2 (en) | 2006-07-14 | 2013-02-05 | Qualcomm Incorporated | Frequency selective and frequency diversity transmissions in a wireless communication system |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5432780A (en) * | 1988-09-12 | 1995-07-11 | Motorola, Inc. | High capacity sectorized cellular communication system |
| GB2281011B (en) * | 1993-08-12 | 1998-04-08 | Northern Telecom Ltd | Base station antenna arrangement |
| ZA948134B (en) * | 1993-10-28 | 1995-06-13 | Quaqlcomm Inc | Method and apparatus for performing handoff between sectors of a common base station |
| JP3308835B2 (en) * | 1996-12-06 | 2002-07-29 | 株式会社日立製作所 | Wireless communication system |
| GB2320618A (en) * | 1996-12-20 | 1998-06-24 | Northern Telecom Ltd | Base station antenna arrangement with narrow overlapping beams |
| US6122266A (en) * | 1997-02-19 | 2000-09-19 | Lucent Technologies Inc. | Multi-level sectorized CDMA communications |
| US6104930A (en) * | 1997-05-02 | 2000-08-15 | Nortel Networks Corporation | Floating transceiver assignment for cellular radio |
| SE9702408L (en) * | 1997-06-24 | 1998-12-25 | Ericsson Telefon Ab L M | Sectorization of a cellular CDMA system |
| US6094165A (en) * | 1997-07-31 | 2000-07-25 | Nortel Networks Corporation | Combined multi-beam and sector coverage antenna array |
| US6167036A (en) * | 1998-11-24 | 2000-12-26 | Nortel Networks Limited | Method and apparatus for a sectored cell of a cellular radio communications system |
-
2000
- 2000-10-14 WO PCT/US2000/028614 patent/WO2001031941A1/en not_active Application Discontinuation
- 2000-10-14 CN CN00813484.7A patent/CN1376364A/en active Pending
- 2000-10-14 EP EP20000978229 patent/EP1226723A4/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014056197A1 (en) * | 2012-10-12 | 2014-04-17 | 华为技术有限公司 | Method, apparatus and base station for improving user capacity in physical sector |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1226723A4 (en) | 2002-10-25 |
| WO2001031941A1 (en) | 2001-05-03 |
| EP1226723A1 (en) | 2002-07-31 |
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