CN1268277A - Sectorization of cellular CDMA-system - Google Patents
Sectorization of cellular CDMA-system Download PDFInfo
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- CN1268277A CN1268277A CN98808479A CN98808479A CN1268277A CN 1268277 A CN1268277 A CN 1268277A CN 98808479 A CN98808479 A CN 98808479A CN 98808479 A CN98808479 A CN 98808479A CN 1268277 A CN1268277 A CN 1268277A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04J13/00—Code division multiplex systems
- H04J13/16—Code allocation
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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Abstract
The present invention relates to sectorization of a cellular CDMA-system. Each sectorized cell (CELL) in the CDMA-system comprises a number of antenna sectors (AS1-AS8) having overlapping regions. Each cell is allocated a number of at least two different pilot channels (P1, P2). Two antenna sectors having a common overlapping region are not allowed to use the same pilot channel. At least one of said pilot channels (P1, P2) are reused within the cell, by at least two antenna sectors with no common overlapping region. The antenna sectors that use the same pilot signal are constituting a logical sector (LS1, LS2). A mobile station can communicate with the base station in a cell by using one or more antenna sectors within one or more logical sectors. If a mobile station communicates with the base station within a number of antenna sectors within the same logical sector, no softer handoff is required between the antenna sectors.
Description
Invention field
The present invention relates to the cdma system of honeycomb sectorization and the method in the described honeycomb sectorial CDMA system.More specifically, the present invention relates to the method in a kind of cellular CDMA-system and the described system, wherein each Serving cell is covered by a plurality of antenna sector and each Serving cell uses a plurality of different pilot channels.
Background of invention
In cdma system, all users transmit by using same frequency band simultaneously.In the system between main website and the slave station every connects and uses channel communication, and these channels define by spreading code independently.Main website can be the base station, and slave station can be a mobile radio station.Some information must arrive all mobile radio stations in the Serving cell.In the cdma system according to the IS-95 standard, all mobile radio stations in the serviced sub-district of special control channel--pilot channel--are intercepted.Pilot channel has special spreading code and the use frequency band identical with Traffic Channel.Each Serving cell emission pilot channel in the system, the pilot channel in all Serving cells uses and has the identical sign indicating number of different spreading code phase deviation, thereby they can be distinguished.
Pilot channel is used to give mobile radio station initial system synchronization.Synchronously, pilot channel be moved the station be used for demodulation during from other signal of this base station as the coherent carrier phase reference.In the power measurement that mobile radio station carries out, also use it, show the needs of handover.The coherent demodulation of received signal is carried out in down link by mobile radio station.This goes to estimate that by the pilot channel with base station the characteristic of channel finishes.Channel estimating then is considered to the characteristic of channel corresponding to the Serving cell Traffic Channel.Therefore to have the identical characteristic of channel with pilot channel be fundamental to Traffic Channel.
For the increase capacity and reduce interference in the cdma system, each Serving cell can be by sectorization.Like this, each Serving cell is covered by a plurality of directional antenna beam.After this zone of an antenna beam covering is called an antenna sector.Sectorization can realize by using generation a plurality of aerial array or fan antennas fixing or the on-fixed antenna beam.
Antenna sector in Serving cell has the overlay region.Mobile radio station uses one or more narrow antenna beams--being antenna sector--with base station communication.Therefore interference in the system is reduced, because each mobile radio station only disturbs in the part of service sub-district.
On the other hand, a large amount of antenna sectors cause the increase of handover (the softer handover of the what is called) number of times between the antenna sector.Under softer handover case, mobile radio station be connected to simultaneously it with the antenna sector that leaves and its future with the antenna sector that uses.A large amount of softer handovers then causes the minimizing of capacity, because two antenna sectors use simultaneously when carrying out softer handover.
Traffic Channel can be launched in narrow antenna sector.Pilot channel should be preferably in the antenna sector identical with Traffic Channel to be launched, so that the signal that receives in the mobile radio station is carried out coherent demodulation.But can not in overlapping antenna sector, launch identical pilot channel, because the characteristic of channel of pilot channel and Traffic Channel can be different significantly in the overlapping region.Can reduce the performance of coherent demodulation in the mobile radio station like this.
According to the IS95 standard, the sectorization of Serving cell is possible.All antenna sectors use different pilot channels, promptly are used for the phase deviation difference of the PN sequence of pilot channel.If system is highly sectorization and different pilot channels are used for all antenna sectors, pilot channel number required in each Serving cell can increase.Because all pilot channels use identical sign indicating number and different skews, so different pilot channel numbers are limited.
The shortcoming of the height sectorial CDMA system of the pilot channel of each antenna sector use oneself is: pilot channel is had to multiplexing more continually in the different service cells of wireless communication system.Reduce multiplex distance and then can influence channel estimating.
In the patent application WO 96/37969 of public publication, a kind of method of launching pilot channel in cdma system has been described.Become radiation pattern when use the base station and launch pilot channel, that is, use the antenna beam that is rather narrow that changes direction in time to mobile radio station.The antenna beam that changes is controlled, thereby can make it arrive all parts of Serving cell.Pilot channel also can be launched in the variation antenna beam that a plurality of directions do not overlap each other simultaneously.Each mobile radio station is notified in the base station: when pilot channel is in the various piece of Serving cell.
The shortcoming of this method is that pilot channel can not launched in the whole Serving cell area of coverage continuously.Mobile radio station must obtain the notice when pilot channel is launched in zones of different, this causes the increase of signaling.Another shortcoming is that this method can not realize in the IS95 system.
In the patent application WO 96/37969 that publishes, the another kind of method of emission pilot channel in cdma system has been described.Comprising different information is launched at two interior different pilot channels.First pilot channel is launched with predetermined radiation pattern (for example omnidirectional radiation pattern), and it has determined the covering of Serving cell.Perhaps first pilot channel is launched in changing the narrow antenna lens of direction in time, thereby makes it can inswept whole Serving cell.Second pilot channel is being launched in the narrow antenna lens of a mobile radio station in the mode identical with Traffic Channel.First pilot channel is used to detect the needs of handover between two base stations.Second pilot channel is launched in the antenna lens identical with service signal, therefore can be used in the phase reference that detects as signal coherence in the mobile radio station.
The shortcoming of this method is to have used two different pilot channels to detect the demand of handover and the coherent detection in the mobile radio station.This means that this method can not realize in following the system of standard that IS95 standard and other use single pilot channel.
Brief summary of the invention
The present invention handles the problem of how Serving cell in the cdma system being carried out sectorization, make pilot channel not only be used to estimate the characteristic of channel of Traffic Channel but also be used for determining when to carry out handover, need in each antenna sector, not use different pilot channels simultaneously.
Another problem is, how with an above antenna sector in mobile station communicate and needn't carry out repeatedly the problem of softer handover.
An object of the present invention is to use the pilot channel in the sectorization cellular CDMA-system to estimate that when the characteristic of channel of Traffic Channel and decision carry out handover, need not use a plurality of pilot channels simultaneously in each antenna sector.
Invention is by using different pilot channels in having the antenna sector of public overlay region, still using at least one described pilot channel to solve these problems in an above antenna sector.Therefore, the different pilot channel numbers in Serving cell are less than the antenna sector number in the Serving cell.Communication between main website and the slave station is finished in one or more antenna sectors.
More specifically, by distributing at least two different pilot channels to solve these problems to the sectorization Serving cell.Different pilot channels are then launched in having the antenna sector of public overlay region.At least one pilot channel is used in fact not having at least two antenna sectors of public overlay region.Each antenna sector with same pilot channel constitutes a logic sector.
In Serving cell in the logic sector of at least one activation, slave station or mobile radio station on up link and down link with main website or base station communication.Determining whether logic sector activates will depend on measured up link and downlink signal quality parameter.
In uplink communication, from activating the antenna sector of logic sector, each is received from the signal of mobile radio station.To each received signal measure signal quality parameters, and select each for communication and activate at least one interior antenna sector of logic sector.If selected more than one antenna sector in each logic sector, just be combined from the signal of these selected antenna sectors.
If more than one logic sector activates, the composite signal that activates logic sector from each is that softer handover makes up.The signal that is produced is decoded.
In downlink communication, produce a signal.If an above logic sector activates, the signal that is produced be softer handover distribute to each and activate logic sector.Each at least one antenna sector that activates in the logic sector is selected for communication according to the signal quality parameter of measuring in up link.Signal is emission simultaneously in the selected antenna sector of each activation logic sector.
Advantage of the present invention be do not use count the different pilot channels of as much with antenna sector also can be with the Serving cell sectorization.
Another advantage is mobile radio station can not need softer handover with base station communication in belonging to an above antenna sector of identity logic sector a signaling.Therefore, the Serving cell in the cdma system can be by sectorization, and does not increase the base station complexity that softer handover brings.
Brief description of the drawings
Fig. 1 illustrates that according to an example that shows the problem that will solve a Serving cell is divided into eight antenna sectors that use the same pilot channel.
Fig. 2 explanation uses different pilot channels that Serving cell is divided into eight antenna sectors in each antenna sector according to prior art.
Fig. 3 illustrates that two different pilot channels used according to the invention are divided into eight antenna sectors with Serving cell.
In Fig. 4, represented up link device according to the embodiment of the invention of relevant Serving cell uplink scenario.
In Fig. 5, represented down link device according to the embodiment of the invention of relevant Serving cell downlink scenario.
In Fig. 6, be the flow chart of the present invention embodiment of communication means in up link.
In Fig. 7, be the flow chart of the present invention embodiment of communication means in down link.
The concise and to the point description that discloses
In Fig. 1, represented to have the sectorization Serving cell of overlapping region.Serving cell comprises base station BS, and the latter comprises the antenna assembly that is used to produce eight fixed antenna lobes (wherein each covers an antenna sector AS1-AS8).The adjacent antenna sector has overlapping region R.System shown in Fig. 1 is the example of explanation problem solved by the invention.Identical pilot channel P launches in the down link of all antenna sectors.If pilot channel will only be used for the handover indication, this can be a kind of natural way of wishing to realize sectorized systems so.
But the characteristic of channel that is based in the overlay region that pilot channel measures can be different significantly with the characteristic of channel of the Traffic Channel of launching in that sector.Because lobe is overlapping, the signal of launching on the pilot channel can superpose in the overlay region, causes its antenna pattern different with the antenna pattern of Traffic Channel.When the channel estimating on using pilot channel was carried out the coherent detection of down link, the letter loss of energy can be very serious.Therefore can not in having the antenna sector of overlay region, launch identical pilot channel.
In Fig. 2, represented sectorization Serving cell according to prior art.Serving cell comprises base station BS, and the latter comprises the antenna assembly that is used to produce eight fixed antenna lobes (wherein each covers an antenna sector AS1-AS8).The adjacent antenna sector has the overlapping region.Each antenna sector has the pilot channel P1-P8 of oneself.This means that the sector has been assigned with eight different pilot channels.Neither one has the sector of overlay region and uses identical pilot channel, this means that channel estimating is correct in Serving cell.But the pilot channel number in the Serving cell is identical with the antenna sector number.Therefore the Serving cell of height sectorization uses a lot of different pilot channels.The multiplex distance that has between two Serving cells of same pilot channel has then shortened, and causes the interference in this system to increase.
According to the present invention, each Serving cell in the cellular CDMA-system is divided at least four antenna sectors.Each Serving cell comprises a base station and a plurality of mobile radio station.The base station comprises antenna assembly, for example aerial array or fan antenna, and their produce the fixing narrow antenna beam that respectively covers an antenna sector of Serving cell.Each base station in the system has been assigned with a plurality of (at least two) pilot channel.
Two antenna sectors with public overlay region do not allow to use identical pilot channel.Multiplexing in one or more antenna sectors of at least one pilot channel in a Serving cell.Pilot channel then can be launched from the antenna assembly identical with Traffic Channel, therefore has the identical antenna pattern and the identical characteristic of channel.Therefore can in mobile radio station, carry out correct coherent detection.That uses the same pilot channel uniting of antenna sector is called as a logic sector.
In Fig. 3, represented to use the sectorization Serving cell CELL of two different pilot channel P1 and P2 according to one embodiment of the invention.In this example, Serving cell is changed into eight antenna sector AS1-AS8 by the sector.Two adjacent antenna sectors have the overlapping region.In this example, can in Serving cell, only use two different pilot channels, therefore in four non-overlapped antenna sectors, use each pilot channel.Therefore the first pilot channel P1 and the second pilot channel P2 are assigned among the Serving cell CELL.
Therefore different pilot channels are used in the adjacent antenna sector.Pilot channel P1 and P2 can be used for more than one antenna sector, and each antenna sector at interval uses identical pilot channel in this example.The first pilot channel P1 is used among antenna sector AS1, AS3, AS5, the AS7, and second pilot channel is used among antenna sector AS2, AS4, AS6, the AS8.Therefore Serving cell comprises two logic sector LS1, LS2 in this example.
In one embodiment of the invention, mobile radio station can only use an antenna sector and base station communication.This embodiment guarantees that the interference in the wireless communication system downlink keeps very low, because only carry out in a narrow antenna sector of Serving cell with the radio communication of a mobile radio station.Can in an antenna sector, carry out the diversity combination, but the combination of the diversity of signal can not be carried out in such an embodiment in the different antennae sector.
In another embodiment of the present invention, mobile radio station can use more than one antenna sector and base station communication.If be reflected or scattering, comprise that those several multipath signals that arrive from the different antennae sector are just detected by the base station from the signal of mobile radio station emission.In such embodiments, arrive from the different antennae sector, can diversity combination the base station from the multipath signal of a mobile radio station.Use the same manner, same signal can be launched simultaneously in the base station in an above antenna sector, and because (for example) scattering, signal can be received by a mobile radio station and the diversity combination.
Signal quality measuredly can on the pilot channel of down link, carry out by mobile radio station at present.Signal quality measured for example can be signal strength signal intensity and/or interferometry.Measure based on these, one or more logic sectors can be elected as activation.So the antenna sector in the activation logic sector then should be used for and the communicating by letter of specific mobile radio station.If have only a logic sector to be chosen as activation, then the signal from several antenna sectors in this logic sector can be combined, and needn't carry out softer handover combination.In this case, mobile radio station will can not notice that it communicates by letter with an above antenna sector.Will need less signaling than softer handover case between mobile radio station and the base station.
In Fig. 4, represented to receive an embodiment of the up link device of uplink signal in the sectorization Serving cell according to the present invention.In the present embodiment, the up link device is considered to be included in the base station of Serving cell.It also is fine understanding that but some parts of described up link device can be included in (for example) base station controller.Serving cell is considered to carry out sectorization with mode same as shown in Figure 3, wherein eight antenna sectors is constituted two logic sectors.Mobile radio station considered to be in the Serving cell and just with base station communication.This up link device comprises uplink communication unit 301a, the 301b that is used for each logic sector.This device also comprises control unit 302, and which logic sector it is used to determine to activate.In this example, think that two logic sectors all activate.
Each uplink communication unit comprises four receiver R1, R3, R5, R7 and R2, R4, R6, R8, its each be connected to the antenna assembly that produces an antenna lens into each receiver.Each antenna lens covers an antenna sector.Antenna assembly can be (for example) aerial array or fan antenna.The antenna sector of receiver R1, R3, R5, R7 covers first logic sector, and the antenna sector of all the other receiver R2, R4, R6, R8 covers second logic sector.Receiver is numbered according to the number among Fig. 3.
Each receiver R1-R8 intercepts the communication channel of mobile radio station and receives signal on that channel.The up link device also comprises a signal processing unit S1-S8 of each receiver.For example, these unit comprise be used for each received signal be down-converted to base band device, be used to estimate each signal time delay device, be used for the device of signal despreading and the device that is used to estimate the SNIR value (signal is to the ratio of noise and interference) of each signal.
The SNIR value of estimating is passed to decision unit 303a, 303b.Decision unit is determined what which antenna sector or those antenna sectors will be considered to activate according to the SNIR value of estimating.Decision unit is to select the selected cell 304a of signal, the judgement that 304b provides it from selected antenna sector.If selected more than one signal, just in assembled unit C1, C2, make up signals selected.
If system can carry out channel estimating and channel compensation on uplink signal, the coherent combination of uplink signal is exactly possible so.
In the present embodiment, two logic sectors activate.The output of each is the signal of combination among uplink communication unit 301a, the 301b.The up link device also comprises softer handover combiner unit 305.When an above logic sector activated, this Be Controlled unit, unit 302 activated.Softer handover assembled unit 305 will get up from the signal combination of Different Logic sector according to the known method of softer handover combination.For example, the combination of the softer handover of signal can be only carried out signal with acceptable signal intensity.305 signal strength signal intensities that can check signal of softer handover assembled unit.
Activate if having only a logic sector to be determined, so just needn't carry out softer handover.More than one antenna sector then can be used for and the communicating by letter of mobile radio station in logic sector, and needn't carry out softer handover.So just must exchange with mobile radio station without any softer handover signaling.The up link device also comprises the decoding unit 306 that is used for the composite signal decoding of gained.
In Fig. 5, represented according to the present invention an embodiment of the down link device of transmitting down link signal in a Serving cell.The configuration of this Serving cell is considered to shown in Figure 3 similar.
The down link device comprises signal generator 401, is used for signal allocation to the softer handover allocation units 402 of different activation logic sectors and the control unit 302 that is used to control softer handover allocation units.This control unit is considered to control unit same as shown in Figure 4.The down link unit also comprises downlink communication unit 403a, a 403b in each logic sector, is two downlink communication unit in this case.
Each downlink communication unit comprises four transmitter T1, T3, T5, T7 and T2, T4, T6, T8, and wherein each is connected to the antenna assembly that is used to each transmitter to produce an antenna lens.Each antenna lens covers an antenna sector.Transmitter is numbered according to the number of Fig. 3.
Each downlink communication unit 403a and 403b comprise decision unit 303a and 303b, then are physical decision unit same as shown in Figure 4 in the present embodiment.Each decision unit 303a, 303b determine which logic sector or which logic sector will be used for downlink communication.According to the distinct principle that for example proposes in conjunction with Fig. 4, this judgement is based on the up link SNIR value of estimating.
But the situation in the down link is compared some difference of up link.In uplink communication, the signal of preferably combination the best, the signal that promptly has the highest instantaneous SNIR value.And in down link, this judgement is based upon on the basis of the several estimation SNIR values on a period of time then more reliable.Decision unit 303a, 303b then store the SNIR value on a period of time.
In Fig. 6, represented flow chart at the inventive method embodiment of uplink communication.As noted earlier, the base station is according to the signal quality measured logic sector of selecting one or one group activation that carries out on the downlink.
When mobile radio station is launched information on Traffic Channel, all antenna assemblies in activating logic sector will be intercepted this channel and be received the signal of (501) each antenna sector.The RAKE combination can be used to make up the several signals on this channel in the antenna sector.For each received signal is estimated (502) SNIR value.Signal is further processed according to known method.Each received signal is carried out time delay to be estimated and despreading.Channel estimating and channel compensation also can carry out the place of this operation and carry out in system.
A plurality of N antenna sectors selected (503) in each activation logic sector are used for the uplink communication with mobile radio station.Select one of as follows in the present embodiment based on the SNIR value of estimating.
According to first embodiment of the invention, its base station can be used for counting N with the antenna sector of specific mobile station communicate and can fix.In such an embodiment, to N antenna sector in the logic sector that belongs to the identity logic sector, select wherein the highest being used for of SNIR value to communicate by letter.The signal that receives from these antenna sector will be combined.
According to a second embodiment of the present invention, select the SNIR value to surpass antenna sector predetermined threshold, that belong to the identity logic sector and be used for communication.The signal that receives from these antenna sector will be combined.
A third embodiment in accordance with the invention, its SNIR value will be selected for communication by the antenna sector that fixing percentage P surpasses in the activation logic sector of maximum estimated SNIR percentage P.The signal that receives from these antenna sector will be combined.
The signal that in selected antenna sector, receives be combined (504).If carried out the combination of channel estimating and channel, signal just can coherently make up.If an above logic sector is (Y in 505) that activate, then the signal of gained can be according to known method by softer handover combination (506) after the combination in each logic sector.
After this signal of gained decoded (507) and further handle according to known method.If having only a logic sector is (N in 505) that activate, the signal decoded (507) of gained and further handle after the combination in this logic sector according to known method.
Signal quality measured quilt on the pilot channel carries out continuously, and then can change in calling procedure about the judgement whether logic sector activates.
In Fig. 7, represented the flow chart of an embodiment of the inventive method of in a Serving cell, communicating by letter in the down link.Suppose to have determined which logic sector or which logic sector activate.
At first produce (601) signal.If an above logic sector is (Y in 602) that activate, just carries out signal to the softer handover that each activates logic sector and distribute (603) according to known method.More than one antenna sector selected (604) is used on down link and mobile station communicate.This selection is based on to be carried out according to the SNIR value of institute's receiving uplink signal being estimated in conjunction with the description of step 502 among Fig. 6.
Selection can be based on carrying out according to the SNIR value of some alternative methods of describing in conjunction with Fig. 6.Consider that in down link the SNIR value in a period of time is more reliable, thereby make it possible in mobile radio station has received the antenna sector of satisfactory quality signal in a period of time, transmit.
Signal will be processed further, comprising upconvert to RF band and power amplification according to known method.Processed signal is launched (605) in each selected antenna sector.
The invention enables and using pilot channel to carry out that handover is measured and in down link, signal carried out coherent demodulation and in each antenna sector, do not use the sectorization of the Serving cell in the cdma system of different pilot channels to become possibility.At this, the pilot channel number is lower than the antenna sector number in the Serving cell.
Signal from an above antenna sector can be combined, and if only made up signal from a logic sector, then needn't carry out softer handover.
Cdma system according to invention has been described as including base station and mobile radio station in a preferred embodiment.More generally, the base station can be considered to main website, and mobile radio station can be considered to slave station.
Claims (21)
1. the cellular CDMA-system that comprises at least one main website (BS) and at least one slave station, described main website comprises and produces the antenna assembly of four direction antenna beam at least, each antenna beam covers an antenna sector (AS1-AS8) of Serving cell (CELL), wherein each antenna sector by at least one other antenna sector overlap, and the Serving cell of each sectorization has been assigned with at least two different pilot channel (P1, P2), it is characterized in that main website also comprises and is used for launching different pilot channels (P1 at the antenna sector with public overlay region from the pilot channel that is distributed, P2) and the device (T1-T8) that is used for not having actually at least two at least one pilot channels of antenna sectors emission of public overlay region.
2. according to the cellular CDMA-system of claim 1, it is characterized in that having antenna sector (AS1, AS3, AS5, the AS7 of same pilot channel (P1, P2); AS2, AS4, AS6, AS8) composition logic sector (LS1, LS2).
3. according to any one cellular CDMA-system in claim 1 and 2, also comprise:
The slave station that is used at least one logic sector (LS1, LS2) is chosen to Serving cell is the control unit (302) that activates; And
The device that is used for up link in described at least one logic sector and down link and described slave station communication.
4. according to any one cellular CDMA-system among the claim 1-3, it is characterized in that antenna assembly comprises aerial array.
5. according to any one cellular CDMA-system among the claim 1-3, it is characterized in that antenna assembly comprises fan antenna.
6. according to any one cellular CDMA-system among the claim 2-5, it is characterized in that described being used for comprises at the device of up link with described slave station communication:
Be used for antenna sector (AS1-AS8) received signal in the logic sector (LS1, LS2) and make up the uplink communication unit (301a, 301b) of each logic sector (LS1, LS2) of described signal;
Be used to make up softer handover combiner unit (305) from the signal of Different Logic sector; And
Xie Ma decoding unit (306) to received signal.
7. according to the cellular CDMA-system of claim 6, it is characterized in that described uplink communication unit (301a, 301b) also comprises:
Be used for from the receiver (R1-R8) of each antenna sector (AS1-AS8) of slave station receiving uplink signal;
The signal processing unit (S1-S8) that is used for each antenna sector of estimation time delay and despreading to received signal and measure signal quality parameters (SNIR);
Be used for determining that according to the signal quality parameter of measuring (SNIR) which antenna sector will be used for the decision unit of uplink communication (303a, 303b);
Be used to select to be used for the selected cell (304a, 304b) of uplink communication from the signal which antenna sector receives; And
Be used for when the signal selected from an above antenna sector, just making up signals selected combiner unit (C1, C2).
8. according to any one cellular CDMA-system in claim 6 and 7, it is characterized in that described uplink communication unit (301a, 301b) also comprises:
Received signal in the logic sector (LS1, LS2) is carried out the device of coherent combination.
9. according to any one cellular CDMA-system among the claim 2-8, it is characterized in that, be used for comprising at the described device of down link with described slave station communication:
Be used to produce the signal generation unit (401) of signal;
Be used for the softer handover allocation units (402) of described signal allocation to the logic sector (LS1, LS2) that activates;
The downlink communication unit of each logic sector (403a, 403b) is used for selecting at least one antenna sector (AS1-AS8) and signal being transmitted into slave station in the described selected antenna sector at the logic sector that activates.
10. according to the cellular CDMA-system of claim 9, it is characterized in that described downlink communication unit comprises:
Decision unit (303a, 303b) is used for determining which antenna sector will be used for and slave station communication;
Allocation units (404a, 404b) are used for signal allocation to each antenna sector that should be used for downlink communication; And
The transmitter (T1-T8) of each antenna sector (AS1-AS8) is used for just transmitting when this antenna sector is used for downlink communication.
11., it is characterized in that described main website is the base station according to any one cellular CDMA-system among the claim 1-10.
12., it is characterized in that described slave station is a mobile radio station according to any one cellular CDMA-system among the claim 1-11.
13. a kind of method in the cellular CDMA-system, this cdma system comprises at least one main website (BS) and at least one slave station (MS), described main website comprises and produces the antenna assembly of four direction antenna beam at least, each antenna beam covers an antenna sector (AS1-AS8) of Serving cell (CELL), wherein each antenna sector by at least one other antenna sector overlap, and the Serving cell of each sectorization has been assigned with at least two different pilot channel (P1, P2), wherein, this method that is used for the Serving cell of each sectorization comprises the steps: b) launch different pilot channels (P1 at antenna sector from the pilot channel that is distributed with public overlay region, P2); C) there be not at least one in the described pilot channels of emission (P1, P2) at least two antenna sectors (AS1-AS8) of public overlay region actually.
14. the method according to claim 13 is characterized in that, has antenna sector (AS1, AS3, AS5, the AS7 of same pilot channel (P1, P2); AS2, AS4, AS6, AS8) composition logic sector (LS1, LS2); And wherein this method also comprises:
In at least one logic sector (LS1-LS2), carry out up link and downlink communication with slave station.
15. the method according to claim 14 is characterized in that, comprises the steps: with described communication of slave station at least one logic sector
A) signal quality parameter of measurement pilot (P1, P2);
B) selecting at least one logic sector (LS1, LS2) according to the signal quality parameter of measuring is what activate; And
C) in the logic sector (LS1, LS2) of each activation, carry out up link and downlink communication with slave station at least one antenna sector (AS1-AS8).
16. the method according to claim 15 is characterized in that, the described step of carrying out uplink communication with slave station at least one antenna sector (AS1-AS8) in each logic sector (LS1, LS2) comprises the steps:
A) receive (501) signal from slave station in the antenna sector in the logic sector of each activation;
B) signal quality parameter of estimation (502) received signal;
C) select (503) at least one antenna sector to be used for communication according to the mass parameter of estimating;
D) if selected more than one antenna sector, the received signal from selected antenna sector in the logic sector of each activation is made up (504);
E) if an above logic sector is (Y in 505) that activate, then will makes up (506), thereby obtain a signal from the softer handover of the composite signal of all activated logic sector ground; And
F) to gained signal decoding (507).
17. method according to claim 15, it is characterized in that, only allow a logic sector (LS1, LS2) to be chosen as activation, wherein the described step of carrying out uplink communication with slave station at least one antenna sector (AS1-AS8) in each logic sector (LS1, LS2) comprises the steps:
A) receive (501) signal from slave station in the antenna sector in the logic sector that activates;
B) signal quality parameter of estimation (502) received signal;
C) select (503) at least one antenna sector to be used for communication according to the mass parameter of estimating;
D) if selected more than one antenna sector, then will make up (504) from the received signal of selected antenna sector;
E) to gained signal decoding (507).
18., it is characterized in that the received signal in each logic sector (LS1, LS2) is by coherent combination according to any one method in claim 16 and 17.
19. according to any one method among the claim 14-18, the described step of carrying out downlink communication with slave station at least one antenna sector (AS1-AS8) in each logic sector (LS1, LS2) comprises the steps:
A) produce (601) signals;
B) if an above logic sector is (Y in 602) that activates, then distribute (603) to all activated logic sector on the softer handover of signal ground; And
C) mass parameter of estimating according to uplink signal, at least one is used to carry out the antenna sector of downlink communication to select (604); And
D) in selected antenna sector, launch (605) this signal to slave station.
20., it is characterized in that described main website is the base station according to any one method among the claim 13-19.
21., it is characterized in that described slave station is a mobile radio station according to any one method among the claim 13-20.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE9702408A SE9702408L (en) | 1997-06-24 | 1997-06-24 | Sectorization of a cellular CDMA system |
| SE97024087 | 1997-06-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1268277A true CN1268277A (en) | 2000-09-27 |
Family
ID=20407489
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN98808479A Pending CN1268277A (en) | 1997-06-24 | 1998-05-26 | Sectorization of cellular CDMA-system |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP0992169A1 (en) |
| JP (1) | JP2002508905A (en) |
| KR (1) | KR20010014223A (en) |
| CN (1) | CN1268277A (en) |
| AU (1) | AU742161B2 (en) |
| CA (1) | CA2294224A1 (en) |
| SE (1) | SE9702408L (en) |
| WO (1) | WO1998059512A1 (en) |
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| DE59309086D1 (en) * | 1992-08-26 | 1998-11-26 | Siemens Ag | MOBILE RADIO NETWORK |
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-
1997
- 1997-06-24 SE SE9702408A patent/SE9702408L/en not_active Application Discontinuation
-
1998
- 1998-05-26 AU AU80440/98A patent/AU742161B2/en not_active Ceased
- 1998-05-26 CA CA002294224A patent/CA2294224A1/en not_active Abandoned
- 1998-05-26 CN CN98808479A patent/CN1268277A/en active Pending
- 1998-05-26 WO PCT/SE1998/000993 patent/WO1998059512A1/en not_active Application Discontinuation
- 1998-05-26 KR KR1019997012310A patent/KR20010014223A/en not_active Application Discontinuation
- 1998-05-26 EP EP98928709A patent/EP0992169A1/en not_active Withdrawn
- 1998-05-26 JP JP50425299A patent/JP2002508905A/en active Pending
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Also Published As
| Publication number | Publication date |
|---|---|
| CA2294224A1 (en) | 1998-12-30 |
| AU8044098A (en) | 1999-01-04 |
| AU742161B2 (en) | 2001-12-20 |
| JP2002508905A (en) | 2002-03-19 |
| EP0992169A1 (en) | 2000-04-12 |
| WO1998059512A1 (en) | 1998-12-30 |
| SE9702408D0 (en) | 1997-06-24 |
| SE9702408L (en) | 1998-12-25 |
| KR20010014223A (en) | 2001-02-26 |
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