CN101459463B - Method, system and device for data transmission - Google Patents
Method, system and device for data transmission Download PDFInfo
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- CN101459463B CN101459463B CN2008101880605A CN200810188060A CN101459463B CN 101459463 B CN101459463 B CN 101459463B CN 2008101880605 A CN2008101880605 A CN 2008101880605A CN 200810188060 A CN200810188060 A CN 200810188060A CN 101459463 B CN101459463 B CN 101459463B
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Abstract
The invention discloses a method of data transmission, a system and a device thereof, which are applied in a system comprising at least two APs, a filter combiner/splitter, an antenna feed device and a terminal, wherein the method comprises the following steps: respectively filtering nonoverlapping channels by the filter combiner/splitter, respectively loading indication data sent by the AP on the nonoverlapping channels, combining the indication data loaded on the nonoverlapping channels after the filtering by the filter combiner/splitter, and sending the indication data after the combing to the terminal through the antenna feed device by the filter combiner/splitter. The invention eliminates the inferences of adjacent channels among the channels of WLAN by means of filtering, realizes the access of a plurality of APs using different WLAN channels in an indoor distributed system, and is further provided with a user access broadband of the WLAN system.
Description
Technical field
The present invention relates to communication technical field, relate in particular to method, system and equipment that a kind of user of raising accesses the transfer of data of density.
Background technology
WLAN (Wireless Local Area Networks, WLAN) development of technology, make people break away from the constraint of cable network, can be more convenient and flexible, accesses network resource quickly, rely on advantages such as " simple, flexible, advanced persons ", the WLAN technology is popularized rapidly, and many American-European countries and area are all carried out " wireless city " and built.
At present, the WLAN networking mode that the scope of application is wider is FIT (thin) AP (Access Point, access points) networking mode, add AP at Access Layer, AP is by ADSL (AsymmetricDigital Subscriber Line, Asymmetrical Digital Subscriber Line) or Ethernet Private Line be linked into BAS (Basic Assembler Program, BAS Broadband Access Server), be linked into metropolitan area network by BAS again.AP is responsible for the digital signal of descending cable network side is converted to the high frequency analog signals of WLAN work, converts up high frequency analog signals to digital signal.Also comprise wireless controller in the FIT AP networking, can other be hung on BAS equipment or be serially connected with AP and BAS in the middle of, wireless controller is responsible for whole distract AP is managed, AP powers on rear automatically from wireless controller download software version and configuration file, working channel and transmitting power that the while wireless controller is regulated AP automatically.
In the construction of WLAN project, how to utilize to greatest extent operator's existing resource to become the factor of overriding concern.At present, PHS (Personal Handy-phone System, personal handhold telephone system), GSM (Global System for Mobile Communications, global system for mobile communications), CDMA (Code Division Multiple Access, code division multiple access system) etc. 2G or 3G indoor distributed system have covered most of building basically, because the operating frequency of wlan system and 2G or 3G system, Line Attenuation, space loss, penetration loss, the parameters such as receiving sensitivity are all very approaching, so general employing wlan system and PHS/GSM/CDMA indoor heating system close the mode of road networking at present, make WLAN and 2G or 3G share a cover indoor distributed system, can well utilize existing resource, it is fast that this networking mode has networking speed, small investment, gain quick return, exempt engineering survey, cover the advantages such as signal is even, become the networking mode of carrier preference.
Under this networking mode, generally first WLAN AP is connected to and closes on road/splitter, close road/splitter will from the data of wlan system with close the road from the data of 2G or 3G system, the data of closing behind the road are sent to indoor distributed antenna feeding device.Antenna feeding device closes circuit-switched data with this and sends to terminal equipment.Accordingly, after antenna feeding device receives data from terminal equipment, data retransmission given close road/splitter, close road/splitter data are sent to respectively WLAN AP, 2G system or 3G system after along separate routes, wlan system is identified data, if the frequency range of these data of identification carrying is then processed these data on the working frequency range of wlan system, otherwise, ignore this data.
Because between the 2.4835GHz, 802.11 agreements are defined in the channel that 3 non-overlapping copies can be arranged at most on this working frequency range to the operating frequency of wlan system at 2.4G.So, theoretically, the channel of 3 non-overlapping copies can be distributed to respectively 3 AP, then 3 AP are linked in the cover indoor distributed system, thereby make the WLAN user's access bandwidth in the indoor distributed system reach maximum.But because the restriction of modulation system can produce energy outside certain band outside each channel, because the spacing of the channel of the non-overlapping copies of WLAN is very narrow, generally only less than 5MHz, so the outer energy of the band of arbitrary channel all can produce interference to other channels.This just causes in the prior art, can only access at most an AP who uses a certain WLAN channel in indoor distributed system, and it is maximum that user's access bandwidth of wlan system can't reach.
Summary of the invention
The invention provides a kind of method, system and equipment of transfer of data, realized a plurality of AP of the different WLAN channels of access use in indoor distributed system, increased user's access bandwidth.
The invention provides a kind of method of transfer of data, be applied to comprise that at least two AP, filtering closes in the system of road/splitter, antenna feeding device and terminal, said method comprising the steps of:
Described filtering is closed road/splitter the channel of non-overlapping copies is carried out respectively filtering, has carried respectively the designation data that described AP sends on the channel of described non-overlapping copies;
Described filtering is closed the designation data that road/splitter will carry out carrying on the channel of filtered non-overlapping copies and is closed the road;
Described filtering is closed the designation data that road/splitter will close behind the road and is sent to described terminal by described antenna feeding device;
Wherein, described filtering is closed the designation data that road/splitter will close behind the road and is sent to after the described terminal, also comprises:
Described filtering is closed road/splitter and is received the access request data that send by described antenna feeding device from described terminal, and described access request Deta bearer is on the channel that described terminal is chosen;
Described filtering is closed road/splitter described access request data is carried out shunt, and the channel of the described access request data of the carrying after the shunt is carried out filtering, will carry out filtered access request data and send to described AP;
Wherein, described system also comprises wireless controller, describedly will carry out filtered access request data and send to after the described AP, also comprises:
Described wireless controller is according to judging from the data of described AP whether the AP load that receives described access request data is normal;
If judged result is yes, described wireless controller sends grant instruction to the AP that receives described access request data, makes the AP that receives described access request data send the access permission data according to described grant instruction to described terminal;
If the determination result is NO, described wireless controller sends the refusal instruction to the AP that receives described access request data, makes the AP that receives described access request data send the refusal access data according to described refusal instruction to described terminal.
Wherein,
Described terminal uses the described channel of choosing and network side to carry out service data interaction after receiving described access permission data;
Described terminal re-starts channel and selects after receiving described refusal access data, uses the new channel of choosing to send the access request data.
Wherein, described terminal is carried out channel according to the rule of setting and is selected to comprise:
Described terminal is selected the highest channel of power; Or
Described terminal is selective channel at random.
The present invention also provides a kind of system of transfer of data, comprises that at least two AP, filtering closes road/splitter, antenna feeding device and terminal,
Described AP is used for using the channel of non-overlapping copies to close road/splitter transmission designation data to described filtering;
Road/splitter is closed in described filtering, be used for the channel of described non-overlapping copies is carried out respectively filtering, the designation data that to carry out carrying on the channel of filtered non-overlapping copies is closed the road, and the designation data of closing behind the road is sent to described terminal by described antenna feeding device; Perhaps described terminal is carried out shunt by described antenna feeding device in the access request data that the channel of choosing sends, the channel of the described access request data of the carrying after the shunt is carried out filtering, will carry out filtered access request data and send to described AP;
Wherein, described terminal for the channel of searching for non-overlapping copies corresponding to described designation data, is carried out channel and is selected, and uses the channel of choosing to send described access request data;
Wherein, described system also comprises wireless controller,
Described wireless controller is used for according to judging from the data of described AP whether the AP load that receives described access request data is normal;
If judged result is yes, send grant instruction to the AP that receives described access request data, make the AP that receives described access request data send the access permission data according to described grant instruction to described terminal;
If the determination result is NO, send the refusal instruction to the AP that receives described access request data, make the AP that receives described access request data send the refusal access data according to described refusal instruction to described terminal.
Wherein,
Described terminal also is used for using the described channel of choosing and network side to carry out service data interaction after receiving described access permission data; After receiving described refusal access data, re-start channel and select, use the new channel of choosing to send the access request data.
Among the present invention, a plurality of AP use the channel access of non-overlapping copies to same distributed antenna feeding device, filtering is closed road/splitter the channel of non-overlapping copies is carried out respectively filtering, and the data that will carry out carrying on the channel of filtered non-overlapping copies are closed the road, and the data of closing behind the road are sent to terminal.By filtering, eliminated the monkey chatter of a plurality of interchannels of WLAN, realized a plurality of AP of the different WLAN channels of access use in indoor distributed system, increased user's access bandwidth of wlan system.
Description of drawings
Fig. 1 is the method flow diagram of a kind of transfer of data among the present invention;
Fig. 2 is the method flow diagram of a kind of transfer of data among the present invention;
Fig. 3 is the application scenarios schematic diagram of the method for a kind of transfer of data among the present invention;
Fig. 4 is the method flow diagram of a kind of transfer of data among the present invention;
Fig. 5 is the application scenarios schematic diagram of the method for a kind of transfer of data among the present invention;
Fig. 6 is the method flow diagram of a kind of transfer of data among the present invention;
Fig. 7 is the system construction drawing of a kind of transfer of data among the present invention;
Fig. 8 is that road/derived channel equipment structure chart is closed in a kind of filtering among the present invention.
Embodiment
The present invention mainly provides a kind of method of transfer of data, main thought is: the present invention uses the channel access of non-overlapping copies to same distributed antenna feeding device by a plurality of AP, filtering is closed road/splitter the channel of non-overlapping copies is carried out respectively filtering, the data that to carry out carrying on the channel of filtered non-overlapping copies are closed the road, and the data of closing behind the road are sent to terminal.By filtering, eliminated the monkey chatter of a plurality of interchannels of WLAN, realized a plurality of AP of the different WLAN channels of access use in indoor distributed system, increased user's access bandwidth of wlan system.
The present invention proposes a kind of method of transfer of data, be applied to comprise that at least two AP, filtering closes in the system of road/splitter, antenna feeding device and terminal, described method may further comprise the steps as shown in Figure 1:
Particularly, the present invention proposes a kind of method of transfer of data, be applied to comprise that at least two AP, filtering closes in the system of road/splitter, terminal, antenna feeding device and wireless controller, described method may further comprise the steps as shown in Figure 2:
To 2.4835GHz, 802.11 agreements are defined in the channel that 3 non-overlapping copies can be arranged at most on this working frequency range to the operating frequency of wlan system at 2.4G.So, according to the agreement regulation, can have at most three AP to use the channel of non-overlapping copies to send designation data.Described designation data can be the Beacon data.
Because the restriction of modulation system can produce energy outside certain band beyond each effective bandwidth, the outer energy of the band of arbitrary channel all can all can produce interference to other channels.So, the invention provides a kind of road/splitter that closes with the channel filter function, i.e. road/splitter is closed in filtering.It can be to assemble respectively filter on common a plurality of minutes road ports that close road/splitter that road/splitter is closed in filtering, wherein, filter can be passive cavity filter or the active cavity fluid filter of bandpass filtering effect, and the logical scope of the band of each filter is the WLAN channel of the AP use of corresponding access this minute road port respectively.Use by road/splitter is closed in filtering can filter out the outer energy of the band of each channel, thereby eliminate the interference that the outer energy of band produces other channel.
For example, road/splitter is closed in the filtering of use active cavity fluid filter provided by the invention, channel at 3 non-overlapping copies is respectively 1 of 802.11 agreements regulation, 6, during 11 channel, a plurality of shunt interport isolations that road/splitter is closed in filtering can reach more than the 80dB, and filtering close the insertion loss of road/splitter can be less than 2dB, thereby guarantee radio-frequency (RF) signal strength.And, when AP change channel, only need the configuration of the active cavity fluid filter of change and this AP connection just can realize the filtering of different channels, close road/splitter and need not to change filtering.
The designation data that antenna by antenna feeding device will close behind the road sends to terminal.Antenna can be the antenna of indoor distributed antenna feeding device, and indoor distributed antenna feeding device can be original 2G or the indoor distributed antenna feeding device of 3G.
After the terminal of support WLAN function is received the instruction of carrying out the WLAN business, can carry out channel search according to the designation data that AP issues, after searching available WLAN channel, carry out channel according to the rule of setting and select, then use the channel of choosing to send the access request data.Wherein, the rule of setting can be to select the highest channel of power in the channel that searches, or in the channel that searches selective channel at random.
For example, the channel of terminal searching to 3 non-overlapping copies is respectively 1,6,11 channels of 802.11 agreements regulation, and the channel selective rule of setting is to select the highest channel of power in the channel that searches, and terminal finds that through detecting the power of channel 1 is the highest.Then use channel 1 to send the access request data by antenna feeding device to network side.
For example, the channel of being chosen by terminal is 1 channel of 802.11 agreements regulation, can use filtering provided by the invention to close road/splitter and first the access request data of 1 channel be carried out shunt, signal along separate routes can be carried out filtering by the filter of minute road port when process is divided road port, because the WLAN channel that the AP of the corresponding access of the logical scope difference of the band of each filter this minute road port uses, so, the AP that can only be used 1 channel in the access request data of 1 channel of 802.11 agreements regulations receives, and can not received by other AP.
Step 206 if it is normal to receive the AP load of access request data, then turns step 207, if receive the AP load too high of access request data, then turns step 209.
The load too high of AP can be divided into following two kinds of situations:
1.AP load definitely too high.The access user quantity of AP or business datum flow surpass the thresholding of setting, and for example, access user quantity is above 20.Then the load of this AP is definitely too high.
2.AP load relatively too high.The load absolute value of AP is not too high, but compares other AP that is connected to same indoor distributed system, and load is relatively too high.For example, be connected among 2 AP of same indoor distributed system, the number of users of the upper access of AP has reached a times of number of users of the upper access of another AP, and (number of users such as the upper access of an AP is 10, the number of users of the upper access of another AP is 5), or the business datum flow on AP has reached a times of number of users of the upper access of another AP.Then the load of this AP is relatively too high.
In the technical program, can be controlled AP according to the data that AP reports by wireless controller.Whether the data that wireless controller reports according to certain AP determine whether the load of this AP is definitely too high, determine to have among these a plurality of AP the load of AP relatively too high according to the data that a plurality of AP of more same indoor distributed system report.
The data that wireless controller reports according to the AP that receives the access request data and other AP that is connected to same indoor distributed system judge that the AP load that receives the access request data is normal, then issue grant instruction to this AP.
Receive the AP of access request data after the grant instruction of receiving from wireless controller, send the access permission data to terminal.
Wireless controller is judged the AP load too high that receives the access request data according to the data that the AP that receives the access request data and other AP that is connected to same indoor distributed system report, and then issues the refusal instruction to this AP.
Receive the AP of access request data after the refusal instruction of receiving from wireless controller, send the refusal access data to terminal.
Fig. 3 is one of the concrete application scenario of the method for the transfer of data that proposes of the present invention, under this application scenario, comprise 2 WLAN AP (being respectively AP1 and AP2), with the filtering of 2 minutes road ports close the access interface of access interface, the 3G system of road/splitter, 2G system, with common road/splitter, antenna feeding device, the terminal equipment of closing of 3 minutes road ports, detailed process may further comprise the steps as shown in Figure 4:
AP1 uses 1 channel of 802.11 agreements regulation to close road/splitter to filtering and sends designation data, and AP2 uses 6 channels of 802.11 agreements regulation to close road/splitter to filtering and sends designation data.
After step 410, terminal equipment are received these access permission data, use 1 channel and AP1 to carry out service data interaction.
Fig. 5 is the Another Application scene of the method for transfer of data of the present invention, the this application scene comprises 3 WLAN AP (being respectively AP1, AP2 and AP3), closes the access interface of road/splitter, 2G system, the access interface of 3G system, 2 common road/splitter (be respectively and close road/splitter 1 and He Lu/splitter 2), antenna feeding device, terminal equipments of closing with 2 minutes road ports with the filtering of 3 minutes road ports, detailed process may further comprise the steps as shown in Figure 6:
AP1 uses 1 channel of 802.11 agreements regulation to close road/splitter to filtering and sends designation data, AP2 uses 6 channels of 802.11 agreements regulation to close road/splitter to filtering and sends designation data, and AP3 uses 11 channels of 802.11 agreements regulation to close road/splitter to filtering and sends designation data.
Step 607 is closed road/splitter 2 these access request data is divided into 2 the tunnel, sends to respectively to close road/splitter 1 and road/splitter is closed in filtering.Wherein, close road/splitter 1 the access request data that receive are divided into 2 the tunnel, send to respectively 2G system and 3G system, 2G system and 3G system detect this request msg and do not belong to the working frequency range of itself, then ignore this request msg.
After step 610, terminal equipment are received this refusal access data, re-start channel and select, use at random 11 channels to send the access request data.
Process afterwards is similar to step 608 to step 606, and the AP3 load is normal, then uses 11 channels to send the access permission data to terminal equipment, and terminal equipment uses 11 channels and AP3 to carry out service data interaction after receiving the access permission data.
Fig. 7 is the system of transfer of data corresponding to the inventive method, comprise that (described system can comprise a plurality of AP for AP1 701, AP2 702, here describe take 2 as example), filtering closes road/splitter 703, terminal 704, wireless controller 705 and antenna feeding device 706, wherein
Road/splitter 703 is closed in filtering, be used for AP1 701 and AP2 702 are carried out respectively filtering in the designation data of the channel transmission of described non-overlapping copies, the described designation data that to carry out carrying on the channel of filtered non-overlapping copies is closed the road, and the designation data of closing behind the road is sent to terminal 704 by antenna feeding device 706; Perhaps terminal 704 is carried out shunt by antenna feeding device 706 in the access request data that the channel of choosing sends, the channel of the described access request data of the carrying after the shunt is carried out filtering, will carry out filtered access request data and send to AP1 701 and AP2 702.
If judged result is normal, then send grant instruction to the AP1 701 that receives described access request data or AP2 702, make AP1 701 or AP2 702 send the access permission data according to described grant instruction to terminal 704;
If judged result is undesired, then send the refusal instruction to the AP1 701 that receives described access request data or AP2702, make AP1 701 or AP2 702 send the refusal access data according to described refusal instruction to terminal 704.
The present invention also provides a kind of filtering corresponding with the inventive method to close road/derived channel equipment, as shown in Figure 8, comprising: filter unit 801, combiner unit 802 and branching unit 803, wherein,
Branching unit 803 is used for data are carried out shunt, and the data after the shunt are sent to filter unit 801.
Physically, filtering is closed road/splitter and can be consisted of by assemble respectively filter on common a plurality of minutes road ports that close road/splitter, wherein, filter can be passive cavity filter or the active cavity fluid filter of bandpass filtering effect, and the logical scope of the band of each filter is the WLAN channel of the AP use of corresponding access this minute road port respectively.
Among the present invention, a plurality of AP use the channel access of non-overlapping copies to same distributed antenna feeding device, filtering is closed road/splitter the channel of non-overlapping copies is carried out respectively filtering, the designation data that to carry out carrying on the channel of filtered non-overlapping copies is closed the road, and the designation data of closing behind the road is sent to terminal.By filtering, eliminated the monkey chatter of a plurality of interchannels of WLAN, realized a plurality of AP of the different WLAN channels of access use in indoor distributed system, increased user's access bandwidth of wlan system.
Through the above description of the embodiments, those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential general hardware platform, can certainly pass through hardware, but the former is better execution mode in a lot of situation.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words can embody with the form of software product, this computer software product is stored in the storage medium, comprise that some instructions are with so that a computer equipment (can be personal computer, server, the perhaps network equipment etc.) carry out the described method of each embodiment of the present invention.
More than disclosed only be several specific embodiment of the present invention, still, the present invention is not limited thereto, the changes that any person skilled in the art can think of all should fall into protection scope of the present invention.
Claims (5)
1. the method for a transfer of data is applied to comprise that at least two AP, filtering closes in the system of road/splitter, antenna feeding device and terminal, it is characterized in that, said method comprising the steps of:
Described filtering is closed road/splitter the channel of non-overlapping copies is carried out respectively filtering, has carried respectively the designation data that described AP sends on the channel of described non-overlapping copies;
Described filtering is closed the designation data that road/splitter will carry out carrying on the channel of filtered non-overlapping copies and is closed the road;
Described filtering is closed the designation data that road/splitter will close behind the road and is sent to described terminal by described antenna feeding device;
Wherein, described filtering is closed the designation data that road/splitter will close behind the road and is sent to after the described terminal, also comprises:
Described filtering is closed road/splitter and is received the access request data that send by described antenna feeding device from described terminal, and described access request Deta bearer is on the channel that described terminal is chosen;
Described filtering is closed road/splitter described access request data is carried out shunt, and the channel of the described access request data of the carrying after the shunt is carried out filtering, will carry out filtered access request data and send to described AP;
Wherein, described system also comprises wireless controller, describedly will carry out filtered access request data and send to after the described AP, also comprises:
Described wireless controller is according to judging from the data of described AP whether the AP load that receives described access request data is normal;
If judged result is yes, described wireless controller sends grant instruction to the AP that receives described access request data, makes the AP that receives described access request data send the access permission data according to described grant instruction to described terminal;
If the determination result is NO, described wireless controller sends the refusal instruction to the AP that receives described access request data, makes the AP that receives described access request data send the refusal access data according to described refusal instruction to described terminal.
2. the method for claim 1 is characterized in that,
Described terminal uses the described channel of choosing and network side to carry out service data interaction after receiving described access permission data;
Described terminal re-starts channel and selects after receiving described refusal access data, uses the new channel of choosing to send the access request data.
3. method as claimed in claim 1 or 2 is characterized in that, described terminal is carried out channel and selected to comprise:
Described terminal is selected the highest channel of power; Or
Described terminal is selective channel at random.
4. the system of a transfer of data comprises that at least two AP, filtering closes road/splitter, antenna feeding device and terminal, it is characterized in that,
Described AP is used for using the channel of non-overlapping copies to close road/splitter transmission designation data to described filtering;
Road/splitter is closed in described filtering, be used for described AP is carried out respectively filtering in the designation data of the channel transmission of non-overlapping copies, the designation data that to carry out carrying on the channel of filtered non-overlapping copies is closed the road, and the designation data of closing behind the road is sent to described terminal by described antenna feeding device; Perhaps described terminal is carried out shunt by described antenna feeding device in the access request data that the channel of choosing sends, the channel of the described access request data of the carrying after the shunt is carried out filtering, will carry out filtered access request data and send to described AP;
Wherein, described terminal for the channel of searching for non-overlapping copies corresponding to described designation data, is carried out channel and is selected, and uses the channel of choosing to send described access request data;
Wherein, described system also comprises wireless controller,
Described wireless controller is used for according to judging from the data of described AP whether the AP load that receives described access request data is normal;
If judged result is yes, send grant instruction to the AP that receives described access request data, make the AP that receives described access request data send the access permission data according to described grant instruction to described terminal;
If the determination result is NO, send the refusal instruction to the AP that receives described access request data, make the AP that receives described access request data send the refusal access data according to described refusal instruction to described terminal.
5. system as claimed in claim 4 is characterized in that,
Described terminal also is used for using the described channel of choosing and network side to carry out service data interaction after receiving described access permission data; After receiving described refusal access data, re-start channel and select, use the new channel of choosing to send the access request data.
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| CN111030663A (en) * | 2019-11-12 | 2020-04-17 | 京信通信技术(广州)有限公司 | Adaptive gating circuit, method, apparatus and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2758992Y (en) * | 2004-12-17 | 2006-02-15 | 摩比天线技术（深圳）有限公司 | Apparatus for making three frequency channel signals into one channel |
| CN1764142A (en) * | 2005-11-08 | 2006-04-26 | 昂科信息技术(上海)有限公司 | WLAN multi-frequency combined signal distributing system |
| CN2775945Y (en) * | 2005-01-26 | 2006-04-26 | 北京东方信联科技有限公司 | PHS/WCDMA WLAN way integrating device |
| CN1833369A (en) * | 2003-04-21 | 2006-09-13 | 3柯姆公司 | Modular RF antenna and filter system for dual radio wlan access points |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1833369A (en) * | 2003-04-21 | 2006-09-13 | 3柯姆公司 | Modular RF antenna and filter system for dual radio wlan access points |
| CN2758992Y (en) * | 2004-12-17 | 2006-02-15 | 摩比天线技术（深圳）有限公司 | Apparatus for making three frequency channel signals into one channel |
| CN2775945Y (en) * | 2005-01-26 | 2006-04-26 | 北京东方信联科技有限公司 | PHS/WCDMA WLAN way integrating device |
| CN1764142A (en) * | 2005-11-08 | 2006-04-26 | 昂科信息技术(上海)有限公司 | WLAN multi-frequency combined signal distributing system |
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