CN101453740A - Method for high way coverage using intelligent antenna - Google Patents
Method for high way coverage using intelligent antenna Download PDFInfo
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- CN101453740A CN101453740A CNA2007101249083A CN200710124908A CN101453740A CN 101453740 A CN101453740 A CN 101453740A CN A2007101249083 A CNA2007101249083 A CN A2007101249083A CN 200710124908 A CN200710124908 A CN 200710124908A CN 101453740 A CN101453740 A CN 101453740A
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Abstract
The invention relates to a method for covering a highway by intelligent antennas, which comprises: two sets of intelligent antennas in the same base station are adopted and have N array elements and M array elements respectively; the two sets of the intelligent antennas cover two opposite directions of the highway respectively; areas covered by the two sets of the antennas are set into the same cell, the two sets of the intelligent antennas are connected to two radio frequency processing units respectively, and the two radio frequency processing units are connected to a baseband processing unit; when the uplink of the base station receives signals, two groups of data are combined into a group of N channel data and transmitted to the baseband processing unit for processing; and when the downlink of the base station transmits data, service beam shaping weights of the antennas are calculated according to channel estimate of the received N channel data after uplink combination, and multiplied by data transmitted by a baseband, and the same signals are transmitted to two radio frequency processing units respectively and transformed into radio frequency signals which are then transmitted by the two sets of the intelligent antennas. The method avoids the possibility of drop call due to over-short handover band in the station in the process of moving at a high speed, and can solve the problem of penetration loss.
Description
Technical field
The present invention relates to mobile communications network, relate in particular to the method that communication network covers the expressway.
Background technology
Along with the continuous development of mobile communication cause, operators are all meticulously building the elaboration Network brand image of oneself.Expressway (comprising highway and railway etc.) is as zone, the transport hub radiation whole nation, and the seamless covering in such area also becomes an important indicator improving network quality.
The expressway has wide coverage along the line, and capacity requirement is little, and the area of coverage is characteristics such as continuous band-shaped.Website should lack as far as possible under the situation that satisfies the covering requirement, helps like this saving the cost of building a station, and also is convenient to the maintenance of later stage network.
Communication user on the expressway is in the compartment in travelling way always, along the traffic lines high-speed mobile, have only just have when arriving place, crossing up and down or stopping website adopt near the demand of network.Simultaneously because the user is in the high-speed mobile most of the time, and especially after the railway speed increase, speed per hour can surpass 200km/h, causes handover very frequent like this, so when building a station, need consider the reliable problem of switching.Switching during high-speed mobile is with the too small switching flow that will cause to finish.Can there be big problem in switching band between the base station because the degree of freedom of planning and adjustment is bigger.But the degree of freedom of switching band planning between each sector in the same station and adjusting is less, under the translational speed more than the 200km/h, switches tape base and originally need guarantee about rice up to a hundred.So wide switching band covers for sub-district in the station and to be difficult to realize.
Existing processing mode mainly is that two kinds of methods are arranged, and a kind of is to adopt the splayed antenna to cover, but shortcoming is that this antenna gain is less, and it is more to build a station during the network coverage, and cost is too high.
Another kind is that method such as number of patent application are 200410080166.5 Chinese patent application " antenna allocation method that is used for the highway wireless coverage ", adopt two directional antennas to cover the opposite direction of highway, two antenna configurations are same sub-district, avoid the problem of switching in the station like this, but do not considered the problem of compartment penetration loss.Because the user is in the automobile, train of high-speed mobile, if the incident direction of wireless signal is too small with the compartment angle, the penetration loss in compartment will be bigger, the signal that the user receives will be very weak, so the high speed roadside can not be close in the present position, base station, and will with the expressway at a distance of certain distance.Bigger before and after the directional antenna of high-gain, make that the coverage under the directional antenna is smaller, if like this angle of two directional antenna beams is excessive, can cause the area of two antenna wireless covering overlapping regions less, may produce coverage hole; And if the angle too small of two antenna beams can cause coverage distance to diminish again, the number that same distance need be built a station increases, and has increased the construction cost of whole network.The fixing beam position of directional antenna has brought no small difficulty to the network planning.
Summary of the invention
Technical problem to be solved by this invention is, overcome the expressway cover in the prior art antenna gain little and cover the difficulty that shortcoming such as dumb is brought to the network planning, a kind of method that the expressway is covered with smart antenna is provided.
Technical scheme of the present invention is: adopt two slave antennas, two rightabouts of high way coverage respectively, described two secondary smart antennas are positioned at same base station, and a pair is a N array element, and a pair is M array element, wherein N 〉=M 〉=1; The zone that the covering of two slave antennas is set is same sub-district, and two slave antennas are connected respectively to two RF processing units, and two RF processing units are connected to a baseband processing unit;
In the base station during up reception, the radiofrequency signal of two slave antennas that two RF processing units will receive respectively converts the baseband I Q data of N passage and the IQ data of M passage to, and two groups of IQ data are merged into to be sent into baseband processing unit behind one group of N channel data and handle;
During the base station down emission, business beam shaping weights according to the channel estimation calculation antenna of the reception data of N passage after up the merging, after partly multiplying each other with base band transmit data, identical signal is sent into two RF processing units respectively, after the process treatment conversion becomes radiofrequency signal, launch by two secondary smart antennas again.
In the such scheme, between described base station and the expressway certain distance is arranged, making between sense and the expressway direction angle is θ: 0＜θ＜45 °.
The method that two groups of IQ data in the such scheme are merged into one group of N channel data is: according to the direct addition of the channel data of corresponding sequence number, if under the situation of M less than N, it is 0 that the place of back is equivalent to data.
The present invention utilizes the different directions of two secondary smart antenna high way coverages, and two slave antenna overlay areas are configured to same sub-district, the inscribe tape swapping too short possibility that causes call drop in station when having avoided high-speed mobile.Compare directional antenna, smart antenna has higher gain and interference rejection capability, can also adjust coverage by the weights configuration.Make base station and expressway that certain distance is arranged among the present invention, certain angle is arranged between aerial signal and the expressway, can solve the penetration loss problem thereby make.
Description of drawings
Fig. 1 is an intelligent antenna business beam high way coverage schematic diagram;
Fig. 2 is a smart antenna connected mode schematic diagram.
Embodiment
Be described in further detail below in conjunction with the enforcement of accompanying drawing technical scheme:
The present invention adopts two secondary smart antennas, and they are positioned at same base station, and a pair is a N array element, and a pair is M array element (wherein N 〉=M 〉=1), and N and M determine according to the Base-Band Processing ability.Two slave antennas are two opposite directions of high way coverage respectively, and the zone that this two slave antennas covering is set is same sub-district, as shown in Figure 1.Among Fig. 1, two small rectangles are represented two secondary smart antennas, and two horizontal parallel lines are represented the expressway.Ellipse representation beam position signal among the figure, the business beam of smart antenna is along with the user moves and real-time change.
Fig. 2 is the schematic diagram of smart antenna and base station equipment connected mode, and wherein smart antenna 1 connects RF processing unit 3, and smart antenna 2 connects RF processing unit 4, and RF processing unit 3,4 links to each other with baseband processing unit simultaneously.
Because the user is in automobile, the train, consider the influence of compartment penetration loss, be provided with between the expressway of antenna and covering and maintain a certain distance, make like this to transmit and there is certain angle theta in the compartment, can effectively reduce penetration loss, angle is generally got: 0＜θ＜45 °.Two secondary smart antennas are positioned at same base station, and a pair is a N array element, and a pair is M array element (wherein N 〉=M 〉=1), are example to get N=M below.
During base station up reception, smart antenna 1 is sent to RF processing unit 3 with the radiofrequency signal that receives, smart antenna 2 is sent to RF processing unit 4 with the radiofrequency signal that receives, and RF processing unit 3 and 4 converts two groups of N passage radiofrequency signals to two groups of N passage baseband I Q data respectively.This method baseband portion can be handled the data of N passage at most simultaneously, so two groups of N passage IQ data were merged into 1 group of N channel data earlier before Base-Band Processing, sends into baseband processing unit then and handles.A kind of fairly simple merging data mode is according to the direct addition of the channel data of corresponding sequence number, if under the situation of M less than N, it is 0 that not corresponding place, back is equivalent to data.
During the base station down emission, utilize the up business beam shaping weights that back N passage receives the channel estimation calculation antenna of data that merge, after multiplying each other with base band data division to be launched, identical signal is sent into RF processing unit 3 and RF processing unit 4 respectively, through after being converted into radiofrequency signal, launch by two secondary smart antennas 1 and 2 again.
The weights of smart antenna are divided into broadcast beam weight and business beam weights.The former is used as Web broadcast and covers, and common antenna will dispose a suitable broadcast weight value usually when the network planning, thereby produces specific covering shape and sensing, and the attitude of antenna itself need not too much be adjusted.This is the characteristics of the convenient various environment network planning of smart antenna itself just.The weights of business beam are to calculate in real time according to user's up received signal, so main lobe can point to the mobile subscriber all the time, higher gain is provided and disturbs inhibition.Among the present invention, the broadcast weight value of smart antenna can be configured by the backstage, changes the coverage that different weights just can change wave beam, thereby has brought facility for the network planning and the optimization of different road degree of crook and varying environment.
Claims (3)
1, a kind of method that adopts the smart antenna high way coverage is characterized in that, adopts two slave antennas, two rightabouts of high way coverage respectively, and described two secondary smart antennas are positioned at same base station, and a pair is a N array element, and a pair is M array element, wherein N 〉=M 〉=1; The zone that the covering of two slave antennas is set is same sub-district, and two slave antennas are connected respectively to two RF processing units, and two RF processing units are connected to a baseband processing unit;
In the base station during up reception, the radiofrequency signal of two slave antennas that two RF processing units will receive respectively converts the baseband I Q data of N passage and the IQ data of M passage to, and two groups of IQ data are merged into to be sent into baseband processing unit behind one group of N channel data and handle;
During the base station down emission, business beam shaping weights according to the channel estimation calculation antenna of the reception data of N passage after up the merging, after partly multiplying each other with base band transmit data, identical signal is sent into two RF processing units respectively, after the process treatment conversion becomes radiofrequency signal, launch by two secondary smart antennas again.
2, the method for the described employing smart antenna of claim 1 high way coverage is characterized in that, between described base station and the expressway certain distance is arranged, and making between sense and the expressway direction angle is θ: 0＜θ＜45 °.
3, the method for claim 1 or 2 described employing smart antenna high way coverages is characterized in that, the method that described two groups of IQ data are merged into one group of N channel data is according to the direct addition of the channel data of corresponding sequence number.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101249083A CN101453740A (en) | 2007-12-07 | 2007-12-07 | Method for high way coverage using intelligent antenna |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101249083A CN101453740A (en) | 2007-12-07 | 2007-12-07 | Method for high way coverage using intelligent antenna |
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| CN101453740A true CN101453740A (en) | 2009-06-10 |
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| CNA2007101249083A Pending CN101453740A (en) | 2007-12-07 | 2007-12-07 | Method for high way coverage using intelligent antenna |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103118372A (en) * | 2013-01-30 | 2013-05-22 | 江苏省邮电规划设计院有限责任公司 | Setting method of CDMA (code division multiple access) wireless communication network in high-speed rail environment |
| WO2019062345A1 (en) * | 2017-09-27 | 2019-04-04 | 中兴通讯股份有限公司 | Transmission method and device and reception method and device for downlink data, and storage medium |
-
2007
- 2007-12-07 CN CNA2007101249083A patent/CN101453740A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103118372A (en) * | 2013-01-30 | 2013-05-22 | 江苏省邮电规划设计院有限责任公司 | Setting method of CDMA (code division multiple access) wireless communication network in high-speed rail environment |
| CN103118372B (en) * | 2013-01-30 | 2015-04-01 | 江苏省邮电规划设计院有限责任公司 | Setting method of CDMA (code division multiple access) wireless communication network in high-speed rail environment |
| WO2019062345A1 (en) * | 2017-09-27 | 2019-04-04 | 中兴通讯股份有限公司 | Transmission method and device and reception method and device for downlink data, and storage medium |
| US11502802B2 (en) | 2017-09-27 | 2022-11-15 | Zte Corporation | Transmission method and device and reception method and device for downlink data, and storage medium |
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Open date: 20090610 |