CN103889014A - Multi-mode mine wireless communication gateway and switching method - Google Patents
Multi-mode mine wireless communication gateway and switching method Download PDFInfo
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- CN103889014A CN103889014A CN201410136767.7A CN201410136767A CN103889014A CN 103889014 A CN103889014 A CN 103889014A CN 201410136767 A CN201410136767 A CN 201410136767A CN 103889014 A CN103889014 A CN 103889014A
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Abstract
The invention discloses a multi-mode mine wireless communication gateway and a switching method. The gateway comprises a mixing type coupler, a 4*4 light switch matrix, a summing circuit, a gateway processing unit, an SISO/MIMO access module, a protocol conversion module, a router transfer module, a wireless interface module, a light interface and a bus interface. In the gateway, a WCDMA wireless air interface, a WiFi wireless air interface, a TD-LTE wireless air interface and a WiMAX wireless air interface are configured to output SISO signals and MIMO signals respectively, WCDMA service data, WiFi service data, TD-LTE service data and WiMAX service data after being converted by the protocol conversion module are transferred to corresponding heterogeneous networks through the router transfer module, and inter-network switching is triggered. According to the multi-mode mine wireless communication gateway, a multi-mode working mode is adopted, channel capacity is large, disturbance resistance is high, the requirements for a mining specific service environment and safety are met, and the gateway is suitable for mobile communication and mobile monitoring of the heterogeneous networks like the WiMAX network, the WiFi network, the TD-LTE network and the WiMAX network under mines, and quick switching of mine underground mobile terminals in the heterogeneous networks is guaranteed.
Description
Technical field
Patent of the present invention relates to a kind of communicator that is applicable to colliery underground moving communication system, specifically relates to a kind of multi-mode mine wireless communication gateway and changing method, belongs to communication technical field.
Background technology
Along with the development of mine information construction and the increase in demand of mine communication business, that down-hole engenders multiple wireless access network and deposit trend, as mine WCDMA, WiFi, UWB, WiMAX and TD-LTE etc., they with together with traditional mine mobile communication network, formed a complicated mine heterogeneous wireless network environment.But on the one hand because mine multi-mode, multiband cordless communication network coexist simultaneously, existing mine mobile communication system network coverage is limited, is difficult to meet underground moving user's multi-modal communications demand and the multiservice requirement of heterogeneous network; On the other hand, because mine laneway is long and narrow, wireless field density is zonal distribution, be difficult to adopt a center base station to carry out the network coverage, if realize the wireless coverage of broadband mine mobile communication by a large amount of remote base stations, this must make cost of investment improve rapidly, just needs to adopt mine spaced antenna technology to realize the multiplexing wireless access of heterogeneous network system such as WCDMA, WiFi, WiMAX and TD-LTE.Therefore under mine distributing antenna system framework, how to realize the quick switching of underground moving terminal between mine mobile communication system and above-mentioned heterogeneous network, and how to guarantee underground moving terminal in moving process by switching obtain continuous and effective communication service ensure particularly important.Traditional changing method generally adopts direct-cut operation and the soft handover based on mobile terminal received signal strength measurement, and the transmission diversity switching of website selection etc., these changing methods are all to measure reception of wireless signals intensity as handoff parameter using mobile terminal, need to complete task switching by the mutual informing base station of top signaling, and that distributed multi-antenna system has system power is low, field intensity covers uniform feature, adopt using underground moving terminal measure the wireless signal strength that received complete sky line options and the RRM of base station as the changing method of handoff parameter, the measuring process of underground moving terminal and high complexity and propagation delay time changing method that repeatedly signaling transmission brings cannot be applied in the distributed mine mobile communication system of many antennas, also be difficult to meet the sky line options demand of mine heterogeneous wireless network and switch requirement.
Summary of the invention
Main purpose of the present invention is to solve above-mentioned weak point, Wave division multiplexing passive optical network (WDM-PON) is combined with the distributed MIMO antenna based on optical fiber radio (RoF), for realizing the broadband mine mobile communication of multi-mode, multiband and underground moving terminal in the quick switching of heterogeneous network, a kind of multi-mode mine wireless communication gateway and changing method are provided.
The technical solution used in the present invention is: a kind of multi-mode mine wireless communication gateway is configured to comprise hybrid coupler, 4 × 4 optical switch matrixes, add circuit, gateway processes unit, SISO/MIMO access module, protocol conversion module, Routing Forward Module, radio interface module, optical interface and bus interface, described communication gate is coupled to communication base station, and communicates by optical link and antenna element or radio frequency unit;
Described communication gate is dynamically switched to MIMO pattern and mixed mode by communication system from SISO pattern, by the orthogonal coupling of hybrid coupler MIMO input signal with complete MIMO precoding processing, and after SISO signal and MIMO signal being combined by add circuit, be configured to receive the output signal of described coupler, for underground communica tion device provides 16 tunnel radio channels and/or the 16 tunnels optical channel through Digital Modulation;
In described communication gate, SISO/MIMO access module is configured to adopt WCDMA and/or WiFi, TD-LTE and/or WiMAX wireless air interface to export respectively SISO signal, MIMO signal, protocol conversion module is configured to provide unified data format at up or down direction for Routing Forward Module, Routing Forward Module is configured to WCDMA, WiFi, TD-LTE and WiMAX business datum after protocol conversion module conversion, be forwarded to corresponding heterogeneous network, and trigger switching between net.
In order to predict exactly optimum switching time, first underground moving terminal needs to estimate switching required time.Underground moving terminal, can be by initiating handover request to multi-modal communications gateway to switching objective network in the time that heterogeneous network vertically switches, and multi-modal communications gateway activates corresponding radio interface module and heterogeneous network communicates.Underground moving terminal is obtaining after switching request response, respectively underground moving terminal is received to current network and predicts with the signal strength signal intensity (RSSI) of switching objective network, determines switching time according to the RSSI result of prediction.Concrete steps comprise:
(1) underground moving terminal is initiated pattern handover request to current network and switching objective network (SISO or MIMO), current network base station and the switching time T of switching objective network base station (SISO or MIMO) to down-hole mobile terminal
handoverestimate;
(2) underground moving terminal periodic is monitored it and is received the signal strength signal intensity RSSI of SISI base station or MIMO base station, until monitor the decision threshold P that this signal strength signal intensity is greater than setting
inittime till, the time is now T
init;
(3) underground moving terminal is sampled respectively to the signal strength signal intensity that receives SISI base station or MIMO base station take T as the cycle, obtains sample sequence X
1and X
2, and be weighted smoothing method processing, obtain signal strength signal intensity sequence Y
1and Y
2;
(4) if Y
1and Y
2meet | Y
1-Y
2-(P
rX1-P
rX2) |≤ε completes to switch and estimates, wherein, ε is a very little positive number, P
rX1for the receiving sensitivity of mine movable platform in current network, P
rX2for mine movable platform is in the receiving sensitivity of switching in objective network;
(5) transformed samples step value, next group sample sequence prediction is continued in repeating step (3) and (4), until this formula while meeting, complete while switching, netted between the predicted value T of optimum switching time
handover=T
init+ nT.
When the switching of described communication gate, the performing step of power division and day line options comprises:
(1) described communication gate is periodically monitored the underground moving terminal signaling that each far-end antenna element receives, to i antenna element and underground moving terminal received signal strength (RSSI) parameter value RSS
(i)[N] sets up mapping relations i → RSS
(i)[N], and the signal strength signal intensity that receives current network and switching objective network is estimated;
(2) described communication gate, according to the monitoring result to each underground moving terminal, upgrades the signal strength parameter RSS of underground moving terminal in antenna element mapping table
(i)[N];
(3) each the signal strength signal intensity RSS of described communication gate to the corresponding underground moving terminal of each antenna element in the N time
(i)[N] weighted sum counting statistics mean value
and by the assembly average drawing
with decision threshold P
initrelatively;
(4) (K≤n) individual signal strength signal intensity is greater than threshold value to described communication gate selection K
antenna element, and according to average power allocation rule P
(i)(k)=P
s/ K configures corresponding transmitted power (P
sfor sending gross power), realize and select the good antenna of wireless channel and underground moving terminal communication.
Described communication gate dynamically selects to comprise the multiple operator scheme work of SISO pattern, MIMO pattern and mixed mode according to underground moving terminal received signal strength (RSSI); In SISO pattern, multi-modal communications gateway and far-end antenna element are processed the SISO signal from WCDMA base station or WiFi base station; In MIMO pattern, multi-modal communications gateway and far-end antenna element group are processed the MIMO output signal of TD-LTE base station or WiMAX base station; In mixed mode, WCDMA, TD-LTE, WiMAX and the WiFi output signal of multi-modal communications gateway and antenna element group treatment S ISO base station and MIMO base station.
Described communication gate is by hybrid coupler and the coupling of MIMO base station, and be configured to receive described first signal and the described secondary signal from described MIMO base station at corresponding first day line cap and the second antenna port, and at least one output port, provide output signal, this output signal comprises at least a portion of described first signal and at least a portion of described secondary signal.
Described communication gate provides passive light interface, Ethernet interface, CAN bus interface, PROFIBUS bus interface, LONWORKS bus interface, FF bus interface and RS232/485 interface interface.It is configured to Ethernet data signal, vision signal, audio signal to land, and realizes the transmission of the multimedia service such as downhole data, video image and the access of Industrial Ethernet equipment, ethernet terminal, mobile monitor and communication equipment.
Described communication gate is inbeing safe explosion prevention equipment.
Beneficial effect of the present invention is:
(1) by adopting the selectively coupled or dynamic handoff technique of multi-mode mine wireless communication gateway between SISO pattern, MIMO pattern and mixed mode, improved antijamming capability and the emergency communication ability of mine mobile communication system.
(2) changing method of multi-mode mine wireless communication gateway, have advantages of between net fast switch, without signaling consumption, can improve power efficiency and the switching efficiency of system, ensure that the mobility of mine heterogeneous network requires and communication service requirement.
(3) adopt multi-mode mine wireless communication gateway, data-signal, vision signal, audio signal are landed, for underground communica tion device provides the optical channel of 16 tunnel radio channels or Digital Modulation, realize the multimedia services such as down-hole voice, data, video image and merge.
This gateway adopts multi-mode working mode, and system channel capacity is large, and antijamming capability is strong, meets mining specific environment for use and safety requirements, is suitablely deployed in the severe operational environments such as high temperature under coal mine, high humidity and electromagnetic interference be serious.By power division and antenna selecting method in mine distributing antenna system, transmitted power configuration and antenna selection course complete at mine wireless communication gateway, there is quick switching, without signaling consumption, can improve power efficiency and the switching efficiency of mine mobile communication system, ensure the mobility requirement of mine mobile communication system.
Accompanying drawing explanation
Accompanying drawing described herein, for to further explanation of the present invention and understanding, forms the application's a part.In the accompanying drawings:
Fig. 1 is the multi-mode mine wireless communication gateway structured flowchart of the embodiment of the present invention;
Fig. 2 is multi-mode mine wireless communication gateway and the isomerism network structure schematic diagram of the embodiment of the present invention;
Fig. 3 is the structured flowchart of multi-mode mine wireless communication gateway according to the preferred embodiment of the invention;
Fig. 4 is the pattern switching flow figure of multi-mode mine wireless communication gateway;
Fig. 5 switches schematic diagram between the net of mine mobile communication system heterogeneous network;
Fig. 6 is the theory diagram of multi-mode mine wireless communication gateway coupler according to the preferred embodiment of the invention.
The present invention is described in further detail below with reference to the accompanying drawings and in conjunction with specific embodiments.
Embodiment
With reference to Fig. 1, in embodiment, multi-mode mine wireless communication gateway 60 can dynamically select SISO pattern, MIMO pattern and mixed mode to carry out work, and multi-mode mine wireless communication gateway 60 comprises N (1≤N≤16) radio channel 621 or optical channel 622, baseband processor 604, MIMO processor 605, digital IF processor 606, hybrid coupler 601, add circuit 602, optical switch matrix 603 and EPON interface 607, bus interface 608 and wave point 609 through Digital Modulation.Wherein each radio channel 621 can be configured to process the signal from downhole anti-explosion single-input single-output (SISO) base station 40 and downhole anti-explosion multiple-input and multiple-output (MIMO) base station 50.For FDD air interface, radio channel 621 use multiplexer/duplexer 670 process uplink signal and down link signal.RF downconverter 680 can amplify the reception signal from multiplexer 670, and the centre frequency of signal is arranged on to A/D converter 681 passband inside.Wideband A/D transducer 681 is whole downlink channel digitlizations of air interface, and by sending to far-end antenna element 70 after resampling, extraction and filtering.And it is contrary with above-mentioned down link processing mode to the processing of uplink channel.In multi-mode mine wireless communication gateway 60, if the hybrid coupler 665 of system un-activation, be transferred into so at least a portion of far-end antenna element 70 from the signal of SISO base station 40 by optical switch matrix 603, and can adopt the mode similar to SISO system to use this system.
Far-end antenna element 70 shown in Fig. 1 communicates by a wireless frequency that at least connects corresponding with the wireless frequency of SISO base station 40 use.But in the time optionally activating hybrid coupler 601, signal from SISO base station 40 can combine with MIMO base station 50 output signals of combination, by combinational circuit and optical switch matrix 603, thereby make each far-end antenna element 70 transmit the signal from SISO base station 40 by least two wireless frequencies corresponding with the wireless frequency of SISO base station 40 use, and transmit all two or whole MIMO signal.Thus, multi-mode mine wireless communication gateway 60 selective activation optical switch matrixes 603, process and dynamically system are reconfigured as to MIMO mode of operation or have combination S ISO and the blend modes of operation of MIMO signal from SISO mode of operation.Therefore, in certain embodiments, system can be used as the mimo system that is configured to separately to process LTE master sync signal and/or WiMAX frame preamble and uses, wherein said LTE master sync signal and/or WiMAX frame preamble are only transmitted by a MIMO antenna for base station, or can selectively only be transmitted by a MIMO antenna for base station.Multi-mode mine wireless communication gateway 60 shown in Fig. 1 can cross-couplings or combination by a part for the first signal from MIMO base station and secondary signal, and can be sent to all far-end antenna elements 70, and can not affect its MIMO operation.For instance, each far-end antenna element of system can be configured to transmission from all data flow of MIMO base station 50 and antenna thereof and SISO base station 40 signals of combination, different underground moving terminals 80 (SISO and MIMO) adopts MIMO space division multiplexing technology, and the different far-end antenna element 70 that can be fed to from multi-mode mine wireless communication gateway 60 receives different signals.
Multi-mode mine wireless communication gateway 60 shown in Fig. 1 adopts hybrid coupler 601, it is the orthocoupler of 90 ° of phase shifts, can all MIMO signals of cross-couplings, and can in the situation that not affecting MIMO operation, send it to all far-end antenna elements, each far-end antenna element can transmit all MIMO parallel data streams and can not cause that code stream disturbs.That is: the data that send in distributed MIMO antenna are split in two parallel MIMO Signal with Distributed Transmit Antennas, a system is homophase, another system is 90 ° of phase shifts, therefore by the orthocoupler of 90 ° of phase shifts, not only can improve channel capacity, and can solve the near-far problem that system exists.In certain embodiments, multi-mode mine wireless communication gateway 60 is by coupling SISO base station 40 and MIMO base station 50, can be configured to the control unit with bus interface 608 and wave point 609 of multi-mode working, be connected with far-end antenna element 70 by multi-mode mine wireless communication gateway 60, via after EPON WDM-PON heavy duty respectively with WCDMA, WiFi, TD-LTE and WiMAX network service, and access far-end monitoring system 700 by bus interface 608, realize the mobile monitorings such as down-hole locomotive, personnel.And, in certain embodiments, multi-mode mine wireless communication gateway 60 systems are configured to have Ethernet interface, the passive light network terminal of optical interface, by optical link and the optical line terminal composition EPON that is coupled, and be connected with down-hole Industrial Ethernet equipment, telephone, realize the transmission of the multimedia service such as downhole data, video image and the access of Industrial Ethernet equipment and telephone.
With reference to Fig. 2, it is the heavily loaded isomerism network structure schematic diagram of multi-mode mine wireless communication gateway 60.Wherein heterogeneous network radio interface module 609 comprises WCDMA radio interface module 682, WiFi radio interface module 683, WiMAX radio interface module 684 and TD-LTE radio interface module 685.Mine mobile communication system is before the system reloads such as unrealized WCDMA, WiFi, TD-LTE and WiMAX, and because TDD and FDD are in signals transmission, the method for synchronization difference that synchronization amplifies, so must distinguish TDD to come with FDD.On the one hand, keep synchronizeing according to the feature of TDD signal and base station, realize slot synchronization and amplify.FDD signal, due to uplink and downlink signals frequency difference, only need amplify respectively according to frequency, realizes relatively simple.On the other hand, because mine laneway is long and narrow, be zonal distribution, be difficult to adopt the center base station of a 800MHz or 2.4GHz to cover, and the covering frequence of WCDMA and WiFi is very limited, just need a large amount of remote base stations if realize mine wireless communication broadband mobile, must make cost of investment improve rapidly, therefore, just need to consider to adopt WiFi, the wireless access way of the multisystem such as WiMAX and TD-LTE heavy duty, and TD-LTE and WiMAX base station is upper, downstream rate reaches 100bit/s, the in the situation that of high bandwidth like this, the radio interface module 609 that multi-mode mine wireless communication gateway 60 is configured to have heterogeneous network is realized and being connected of ground base station 55 and down-hole heterogeneous network by RoF access technology, the radio interface module 609 of heterogeneous network is by WDM optical multiplex unit 710, WDM transmitting element 720, WDM receiving element 730 and WDM demultiplexing unit 740 are realized optical fiber radio carrier multiplexing, the power division that underground moving terminal 80 provides according to multi-mode mine wireless communication gateway 60 and antenna selection strategy, carrying out heterogeneous network by far-end antenna element 70 vertically switches.Wherein heterogeneous network comprises WCDMA wireless network 782, WiFi wireless network 783, WiMAX wireless network 784, TD-LTE wireless network 785.Realize after heterogeneous network system heavy duty by multi-mode mine wireless communication gateway 60, because adopting different wave length (or frequency), amplifies in different light paths uplink and downlink signal, thereby there is not self-excitation and the interference of wireless signal, can effectively solve the problem that must adopt different synchronous amplifications because of the difference of uplink and downlink signal multiplexing mode.
With reference to Fig. 3, what in figure, describe is the structured flowchart of the multi-mode mine wireless communication gateway of the preferred embodiment of the present invention.Multi-mode mine wireless communication gateway 60 is made up of gateway processes unit 60L and communication interface circuit (61L～68L, 611～617), gateway processes unit 60L is made up of baseband processor, MIMO processor and digital IF processor, communication interface circuit comprises radio interface module 61L, close switch matrix 62L, hybrid coupler 63L, WDM unit 64L, optical interface 611, Ethernet interface 612, CAN bus interface 613, PROFIBUS bus interface 614, LONWORKS bus interface module 615, FF bus interface 616, RS232/485 interface 617 and protocol conversion module 66L, Routing Forward Module 67L and SISO/MIMO access module 68L, it is connected with MIMO processing unit 60L respectively, MIMO processing unit 60L completes Base-Band Processing, numeral IF and down-converted, A/D conversion and clock synchronous etc.Multi-mode mine wireless communication gateway 60 lands Ethernet data signal, vision signal, audio signal, realizes the transmission of the multimedia service such as downhole data, video image and the access of Industrial Ethernet equipment, monitoring communications equipment, ethernet terminal and wireless signal.Wherein, optical interface 611, by WDM unit 64L connecting system backbone network, closes switch matrix 62L, hybrid coupler 63L and is connected with base station; Multi-modal communications gateway 60 is realized and being connected of the equipment such as down-hole ethernet terminal, Industrial Ethernet by optical interface 611 and/or Ethernet interface 612, for the multimedia such as downhole data, video image provides access; Multi-mode mine wireless communication gateway 60 is realized and the signals collecting of in-site modeling amount control appliance and discrete control equipment and being connected of control and monitoring communications equipment by wave point 61L, CAN bus interface 613, PROFIBUS bus interface 614, LONWORKS bus interface 615, FF bus interface 616 and RS232/485 interface 617, realizes underground moving target monitoring.
With reference to Fig. 4, be multi-modal communications gateway switching flow figure between the net of down-hole heterogeneous network.In order to predict exactly optimum switching time, first underground moving terminal needs to estimate switching required time.When underground moving terminal is vertically switched, can be by multi-modal communications gateway to be initiated to handover request to switching objective network, multi-modal communications gateway activates corresponding radio interface module and heterogeneous network communicates.Underground moving terminal is obtaining after switching request response, respectively underground moving terminal is received to current network and predicts with the signal strength signal intensity (RSSI) of switching objective network, determines switching time according to the RSSI result of prediction.Specific implementation process is as follows: first underground moving terminal is initiated pattern handover request to current network and switching objective network (SISO or MIMO), current network base station and the switching time T of switching objective network base station (SISO or MIMO) to down-hole mobile terminal
handoverestimate; Then underground moving terminal periodic is monitored it and is received the signal strength signal intensity RSSI of SISI base station or MIMO base station, until monitor the decision threshold P that this signal strength signal intensity is greater than setting
inittime till, the time is now T
init; The 3rd, underground moving terminal is sampled respectively to the signal strength signal intensity that receives SISI base station or MIMO base station take T as the cycle, obtains sample sequence X
1and X
2, and be weighted smoothing method processing, obtain signal strength signal intensity sequence Y
1and Y
2; The 4th, if Y
1and Y
2meet | Y
1-Y
2-(P
rX1-P
rX2) |≤ε completes to switch and estimates, wherein, ε is a very little positive number, P
rX1for the receiving sensitivity of underground moving platform in current network, P
rX2for underground moving platform is in the receiving sensitivity of switching in objective network; The 5th, transformed samples step value, repeats the 3rd, the 4th step and continues next group sample sequence prediction, until complete switching; Finally, netted between the predicted value T of optimum switching time
handver=T
init+ nT.
With reference to 5, between the net of mine mobile communication system heterogeneous network, switch schematic diagram.In the time moving in the heterogeneous network environment that underground moving terminal 80 covers at mine spaced antenna wireless signal, SISO base station, down-hole 40 or MIMO base station 50 be the wireless signal strength to underground moving terminal 80 according to each antenna reception, directly by good antenna element 70 transmitted powers of channel condition are configured, realize the process that antenna is selected fast, make base station in system realize the switching of underground moving terminal and improve system power efficiency with simple method.Specific implementation step is as follows: (1) underground moving terminal is initiated network handover request by multi-modal communications gateway to the SISO/MIMO base station of institute's bearer service, multi-modal communications gateway Dynamic Selection mode of operation, multi-modal communications gateway activates corresponding radio interface module and heterogeneous network communicates; (2) multi-modal communications gateway is periodically measured the underground moving terminal signaling that each far-end antenna element of mine distributing antenna system receives, the signal strength signal intensity (RSSI) that underground moving terminal is received to current network and switching objective network is predicted, to n antenna element and underground moving terminal received signal strength parameter value RSS
(n)[N] sets up mapping relations n → RSS
(n)[N]; (3) multi-modal communications gateway upgrades in antenna element table SISO/MIMO base station for the signal strength parameter RSS of this underground moving terminal according to the measurement result of each underground moving terminal
(n)[N]; (4) multi-modal communications gateway in far-end antenna element table corresponding each underground moving terminal signal strength parameter weighted sum counting statistics mean value within a certain period of time
and with decision threshold P
initrelatively; (5) multi-modal communications gateway only for
antenna carry out transmit power assignment, select K (K≤n) individual radio-frequency antenna that is greater than threshold value, and according to average power allocation rule P
(n)(k)=P
s/ K configures corresponding transmitted power (P
sfor sending gross power), realize and select the good antenna of wireless channel and underground moving terminal communication; (6) each power division and antenna selection course are more than repetition (1)～(5) steps in each cycle of operation.
With reference to Fig. 6, what describe is the hybrid coupler operation principle block diagram of multi-mode mine wireless communication gateway, hybrid coupler 63L is essentially the 3dB orthocoupler of 90 ° of phase shifts, can all MIMO signals of cross-couplings, what this coupler served as is for compensating the MIMO pre-coding circuit of the performance loss between the code word that subsurface environment mobile terminal " near-far interference " causes.Equation f shown in Fig. 6 and h represent respectively the input of 3dB orthocoupler and the relation of output port and the transfer function matrix of 90 ° of phase shifts, and transfer function matrix hI is considered to the MIMO pre-coding matrix of the 3dB orthocoupler of 90 ° of phase shifts.By the 3dB orthocoupler of 90 ° of phase shifts being used in the distributed MIMO antenna system of multi-mode mine mobile communication system, the performance of precoding processing can be placed on to the antenna port of MIMO base station, rather than in MIMO base station physical Channel Processing.Can make input signal orthogonal according to the hybrid coupler 63L using in the embodiment of the present invention, equipment between input port 1,2 and output port 3,4 has reciprocity, therefore the transfer function matrix h obtaining after input port and output port exchange is still identical, thereby makes the present invention that the combination MIMO ability of signal is provided in the situation that not affecting MIMO spatial reuse.
Obviously, the technology people of this area should be understood that, each module and various method steps that the invention described above is related, except being used for the subsurface environment of colliery as mobile communication system, by being applicable to mobile monitor or the mobile computing of metal and nonmetal deposits well after suitable integrated or improvement, the present invention does not limit the communication technical field such as mobile monitor and mobile computing except mine mobile communication so yet.
Above content is the further description of the present invention being done in conjunction with concrete preferred embodiment mode; can not assert that the specific embodiment of the present invention only limits to this; for general technical staff of the technical field of the invention; do not departing under the prerequisite of mentality of designing of the present invention; also can carry out suitable change and replacement, all should be considered as belonging to the related protection range of claims that the present invention submits to.
Claims (9)
1. a multi-mode mine wireless communication gateway, it is characterized in that, described communication gate is configured to comprise hybrid coupler, 4 × 4 optical switch matrixes, add circuit, gateway processes unit, SISO/MIMO access module, protocol conversion module, Routing Forward Module, radio interface module, optical interface and bus interface, described communication gate is coupled to communication base station, and communicates by optical link and antenna element or radio frequency unit; Be further characterized in that,
Described communication gate can be selected multiple operator scheme work, operator scheme comprises SISO pattern, MIMO pattern and mixed mode: in the time of SISO work pattern, described communication gate is selected treatment S ISO signal by optical switch matrix, in the time of MIMO work pattern, described communication gate selects to process MIMO signal by optical switch matrix, in the time that mixed mode is worked, described communication gate is by the output signal of add circuit combined treatment SISO and MIMO;
Described communication gate is dynamically switched to MIMO pattern and mixed mode by communication system from SISO pattern, by the orthogonal coupling of coupler MIMO input signal with complete MIMO precoding processing, and after SISO signal and MIMO signal being combined by add circuit, be configured to receive the output signal of described coupler, for underground communica tion device provides 16 tunnel wireless telecommunication channels and/or the 16 tunnels optical channel through Digital Modulation; And
In described communication gate, SISO/MIMO access module is configured to adopt WCDMA and/or WiFi, TD-LTE and/or WiMAX air interface to export respectively SISO signal, MIMO signal, protocol conversion module is configured to provide unified data format at up or down direction for Routing Forward Module, Routing Forward Module is configured to WCDMA, WiFi, TD-LTE and WiMAX business datum after protocol conversion module conversion, be forwarded to corresponding heterogeneous network, and trigger switching between net.
2. the net method for switching between of communication gate according to claim 1, is characterized in that performing step comprises:
(1) underground moving terminal by described communication gate to the SISO base station of institute's bearer service or MIMO base station initiate network handover request, described communication gate triggering system controller also activates corresponding communication base station and radio interface module and heterogeneous network and communicates;
(2) underground moving terminal is initiated pattern handover request to current network and switching objective network (SISO or MIMO), current network base station and the switching time T of switching objective network base station (SISO or MIMO) to underground moving terminal
handverestimate;
(3) underground moving terminal periodic is monitored it and is received the signal strength signal intensity RSSI of SISI base station or MIMO base station, until monitor the decision threshold P that this signal strength signal intensity is greater than setting
inittime till, the time is now T
init;
(4) underground moving terminal is with T
intervalfor the cycle samples respectively to the signal strength signal intensity that receives SISO base station or MIMO base station, obtain sample sequence X
1and X
2, and be weighted smoothing method processing, obtain signal strength signal intensity sequence Y
1and Y
2;
(5) if Y
1and Y
2meet | Y
1-Y
2-(P
rX1-P
rX2) |≤ε completes to switch and estimates, wherein, ε is a very little positive number, P
rX1for the receiving sensitivity of underground moving terminal in current network, P
rX2for underground moving terminal is in the receiving sensitivity of switching in objective network;
(6) transformed samples step value, next group sample sequence prediction is continued in repeating step (4) and (5), until complete switching, the predicted value T of optimum switching time between being netted
handover=T
init+ nT
interval.
3. the changing method of communication gate according to claim 2, is characterized in that the method step of day line options comprises:
(1) described communication gate is periodically monitored the underground moving terminal signaling that each far-end antenna element receives, and i antenna element and underground moving terminal received signal strength (RSSI) parameter value are set up to mapping relations i → RSS
(i)[i], and the signal strength signal intensity that receives current network and switching objective network is estimated;
(2) described communication gate, according to the monitoring result to each underground moving terminal, upgrades the signal strength parameter RSS of underground moving terminal in antenna element mapping table
(n)[N];
(3) each the signal strength signal intensity RSS of described communication gate to the corresponding underground moving terminal of each antenna element in the N time
(i)counting statistics mean value after [i] weighted sum
and by the assembly average drawing
with decision threshold P
initrelatively;
(4) K signal strength signal intensity of described communication gate selection is greater than the antenna element of decision threshold, and according to average power allocation rule P
(i)(k)=P
s/ K configures corresponding transmitted power (P
sfor sending gross power), realize and select the good antenna of wireless channel and underground moving terminal communication.
4. communication gate according to claim 1, is characterized in that, bus interface comprises CAN bus interface, PROFIBUS bus interface, LONWORKS bus interface, FF bus interface and RS232/485 communication interface.
5. communication gate according to claim 1, it is characterized in that, described communication gate is by coupler and base station coupling, and be configured to receive described first signal and the described secondary signal from base station at corresponding first day line cap and the second antenna port, and provide output signal at least one output port.
6. communication gate according to claim 1, is characterized in that comprising:
Device, gateway processes unit, the modulated symbol receiving for Base-Band Processing, reception processing to be so that the estimation of modulated symbol of transmitted signal to be provided, and mimo channel processing, multichannel to transmitter decomposed, digital IF processes and down-converted;
Device, hybrid coupler, is the orthocoupler of 3db, and is configured to export multiple output signals on multiple output ports, under forming in multiple output signals at least one another is orthogonal phase shift relatively;
Device, protocol conversion module, is configured to encapsulate WCDMA, TD-LTE, WiMAX and WiFi air interface, and provides unified data format at up or down direction for Routing Forward Module;
Device, Routing Forward Module, is configured to, by WCDMA, TD-LTE, WiMAX and WiFi business datum after protocol conversion module conversion, be forwarded to corresponding heterogeneous network by Mobile IP.
Device, is configured to comprise multiple antenna ports, for far-end antenna element coupling and receive the modulated signal of far-end antenna element and be up link transmitted signal;
Device, is configured to comprise CAN bus interface, PROFIBUS bus interface, LONWORKS bus interface, FF bus interface and RS232/485 communication interface; And
Device, the shell that is configured to comprise Ethernet interface, passive light interface and there is downhole anti-explosion function.
7. communication gate according to claim 1, is characterized in that, described communication gate is inbeing safe explosion prevention device.
8. communicator according to claim 1 comprises base station, hand held mobile station, vehicle-mounted mobile platform and wireless communication terminal.
9. heterogeneous network according to claim 1, is characterized in that comprising WCDMA network, TD-LTE network, WiMAX network and WiFi network.
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