CN101729123A - Dual-band wireless digital repeater, wireless communication system and data transmission method - Google Patents
Dual-band wireless digital repeater, wireless communication system and data transmission methodDownload PDFInfo
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- CN101729123A CN101729123ACN 200810171760CN200810171760ACN101729123ACN 101729123 ACN101729123 ACN 101729123ACN 200810171760CN200810171760CN 200810171760CN 200810171760 ACN200810171760 ACN 200810171760ACN 101729123 ACN101729123 ACN 101729123A
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B7/14—Relay systems
- H04B7/15—Active relay systems
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- H04B7/15528—Control of operation parameters of a relay station to exploit the physical medium
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Abstract
Description
Technical field
The present invention relates to the mobile communication technology field, relate in particular to the using method of a kind of double frequency-band wireless digital repeater and wireless communication system, data transmission method and a kind of double frequency-band.
Background technology
Because wireless digital repeater has wide coverage, power system capacity is big and lay characteristics such as easy, therefore, its application will be more and more widely.In addition, because time division duplex (TimeDivision Duplex abbreviates TDD as) repeater is simple to spectrum requirement, uplink-downlink configuration is flexible, therefore, the TDD repeater will become the main flow of wireless digital repeater.
Cell mobile communication systems wireless access network based on fixed wireless digital repeater (the Radio Area Networks of Fig. 1 for providing in the correlation technique, abbreviate RAN as) part structural representation, as shown in Figure 1, several wirelessdigital repeater 101a～101n according to certain mode be distributed incellular basestation 102 around,portable terminal 103 can be set up communication link by certain or some wireless digital repeater andcellular basestation 102, in Fig. 1,portable terminal 103 is to set up communication link by a wirelessdigital repeater 101f with the mode and thecellular basestation 102 of double bounce.104 couples of wirelessdigital repeater 101a～101n of relay administrative unit control, and the working time slot of wirelessdigital repeater 101a～101n, working frequency points, code modulation mode etc. are carried out integrated management.
A kind of realization Frequency Division Duplexing (FDD) (Frequency DivisionDuplex that Fig. 2 A provides for correlation technique, abbreviate FDD as) to the structural representation of the wireless digital repeater of TDD conversion, shown in Fig. 2 A, wireless digital repeater comprises two passages of up-downgoing, each passage all carries out demodulation, decoding to the received signal, and modulates again before transmission, encodes.The signal that down going channel receives is fromdonor antenna 201, through duplexer (being filter) 202, low noise amplifier (Low Noise Amplifier, abbreviate LNA as) 203, down-conversion 204, analog to digital conversion (Analog to Digital, abbreviate A/D as) be delivered to descending reception and transmittingbaseband processing unit 206 after 205, descending reception and transmittingbaseband processing unit 206 are under the control ofmanagement control unit 219, carry out demodulation to received signal, decoding and modulation again, after coding waits in the place, through digital to analog conversion (Digital to Analog, abbreviate D/A as) 207, up-conversion 208, power amplifier (Power Amplifier abbreviates PA as) 209, radio-frequency (RF)switch 220,filter 211 is delivered to retransmittingantenna 210 and is transmitted into terminal; Data feedback channel receive from the signal of portable terminal from retransmittingantenna 210, through being delivered to up reception and transmittingbaseband processing unit 215 behindfilter 211, radio-frequency (RF)switch 220,LNA 212, down-conversion 213, the A/D 214, up reception and transmittingbaseband processing unit 215 are under the control ofmanagement control unit 219, carry out demodulation, decoding to received signal and modulate again, coding etc. locate in after, be delivered todonor antenna 201 through digital toanalog conversion 216, up-conversion 217,PA 218,duplexer 202, send to the base station throughdonor antenna 201.
The structural representation that Fig. 2 B provides for correlation technique at the fixed wireless DTU digital trunk unit of TDD system, shown in Fig. 2 B, this wireless digital relay comprises: two antennas (beingdonor antenna 201 and retransmitting antenna 210), filter (filter 211a, filter 211b), radio-frequency (RF) switch (radio-frequency (RF) switch 220a, radio-frequency (RF) switch 220b), (comprising:LNA 212 for receive path, down-conversion 213 and A/D 214), receive path baseband processing unit 206 ', transmission channel baseband processing unit 215 ', (comprising: D/A 207 for transmission channel, up-conversion 208 and PA 209),management control unit 219 '.The main difference of the repeater shown in the repeater shown in Fig. 2 B and Fig. 2 A is to use the transmission channel of a pair of time-sharing work to realize that the relaying between the base station and terminal sends in the TDD system.
The receiving course of said fixing wireless digital repeater be divided into the received signal of (passing through donor antenna) from the base station and from two processes of terminal (passing through retransmitting antenna) received signal (if donor antenna and retransmitting antenna are same antennas, the corresponding portable terminal of this situation is as the situation of repeater, then these two receiving courses all are received signals from the same antenna), repeater from the process of base station received signal is: receive signal fromdonor antenna 201 in certain time slot, with this signal via filter 211b, radio-frequency (RF) switch 220b, LNA 212, down-conversion 213, behind the A/D 214, send to receive pathbaseband processing unit 205 '.Repeater from the process of portable terminal received signal is: the signal that receives self terminal in another time slot from retransmittingantenna 210, with this signal through filter 211a, radio-frequency (RF) switch 220a, LNA212, down-conversion 213, A/D 214 after, send to receive pathbaseband processing unit 206 '.Management control unit 219 ' these two receiving courses of control time-interleaved.
The emission process of said fixing wireless digital repeater is divided into to base station (passing through donor antenna) and transmits and transmit two processes (if donor antenna and retransmitting antenna are same antennas to terminal (passing through retransmitting antenna), the corresponding portable terminal of this situation is as the situation of repeater, and then these two emission processs all are to transmit from same antenna).Repeater to the process of base station transmit signals is: send to the space through transmission channel baseband processing unit 215 ' baseband signal process transmission channel (that is digital toanalog conversion 207,, up-conversion 208 and PA 209) after handling, radio-frequency (RF) switch 220b, filter 211b, donor antenna 201.Repeater to the process that terminal transmits is: send to the space through transmission channel baseband processing unit 215 ' baseband signal process transmission channel (that is, D/A 207, up-conversion 208 and PA209) after handling, radio-frequency (RF) switch 220a, filter 211a, retransmitting antenna 210.Management control unit 219 ' these two emission processs of control time-interleaved.
In the communication system at existing wireless digital repeater place at the TDD system, generally comprise the mode of two kinds of transmission data, Fig. 3 A-Fig. 3 D is a kind of transmission data mode work schematic diagram in this communication system, shown in Fig. 3 A and Fig. 3 B, the data D1 thatbase station 102 sends toterminal 103a passes toportable terminal 103a throughrepeater 101; Shown in Fig. 3 C and Fig. 3 D, the data D2 thatportable terminal 103a sends tobase station 102 passes through the process thatrepeater 101 passes to base station 102.Fig. 4 A-Fig. 4 D is the work schematic diagram of another kind of transmission data mode, shown in Fig. 4 A, the data D1 thatbase station 102 sends toterminal 103a also sends toportable terminal 103a when sending torepeater 101, similarly, shown in Fig. 4 B, the data D2 thatportable terminal 103a sends tobase station 102 also sends tobase station 102 when sending torepeater 101, then, shown in Fig. 4 C, compiled data D1, therepeater 101 of D2 is D1, D2 merges formation data D3, then, shown in Fig. 4 D,repeater 101 is comprising data D1, the D3 of D2 sends tobase station 102 andportable terminal 103a simultaneously, to improvebase station 102 and theportable terminal 103a reception to data.In this manner, thesignal 401a of 101 pairs of base stations ofrepeater 102 emission finishes in identical time slot withsignal 401b to the emission ofterminal 103a, but,repeater 101 sends to that existing D1 also has D2 among the data D3 ofbase station 102 andterminal 103a, andbase station 102 andterminal 103a need parse its data that need from receive data D3.
In present broadband wireless communication technique research, in order to reach high rate data transmission (such as 1Gbps), produced the thinking of spectrum aggregation (Spectrum Aggregation), but, present spectrum aggregation is just by the comprehensive use to a plurality of continuous or discontinuous frequency bands, improve the transmission rate of system or the professional providing capability of raising system, in the practice process, in the wireless communication system that uses a plurality of or multiple frequency band to assemble mutually, can solve insoluble problem in TDD system that only uses single frequency band or the FDD system that only uses a pair of frequency spectrum, such as, the professional duplex mode that is separated with control can be constructed, the problem that the feedback delay in the single time division duplex band system is limited by wireless frame period can be solved by the cooperation of two time division duplex frequency spectrums.
Existing wireless digital repeater at the TDD system, perhaps TDD and the FDD wireless digital repeater of mixing mutually, owing to the restriction of TDD wireless frame period, therefore have the problem of following two aspects: 1) the up-downgoing cycle of TDD wireless frame structure has significantly increased the propagation delay time end to end of system; 2) the up-downgoing cycle of TDD wireless frame structure has restricted the raising of feedback speed in the repeated link, thereby makes the reduction of under the high-speed mobile environment spectrum efficiency of time division duplex repeater.
Summary of the invention
In view of this, the invention provides a kind of double frequency-band wireless digital repeater, double frequency-band wireless communication system and data transmission method, in order to solve the long and slow problem of repeated link feedback speed of the propagation delay time end to end that causes owing to the up-downgoing cycle of wireless frame structure in the prior art.
According to an aspect of the present invention, provide a kind of double frequency-band wireless digital repeater.This double frequency-band wireless digital repeater is applied to comprise the double frequency-band wireless communication system of the first kind radio node and the second class radio node,
Double frequency-band wireless digital repeater according to the present invention comprises: baseband processing unit, resource management and control unit, first antenna that communicates with first kind radio node and second antenna that communicates with the second class radio node, and: be operated in first receive path and first transmission channel that first frequency band and first antenna exist radio frequency to be connected; Be operated in second receive path and second transmission channel that second frequency band and first antenna exist radio frequency to be connected; Be operated in the 3rd receive path and the 3rd transmission channel that first frequency band and second antenna exist radio frequency to be connected; Be operated in the 4th receive path and the 4th transmission channel that second frequency band and second antenna exist radio frequency to be connected; Radio-frequency (RF) switch, be used to realize the switching between switching, second receive path and second transmission channel between first receive path and first transmission channel, and, the switching between the 3rd receive path and the 3rd transmission channel, the switching between the 4th receive path and the 4th transmission channel.
According to a further aspect of the invention, provide a kind of double frequency-band wireless communication system.
Double frequency-band wireless communication system according to the present invention comprises: double frequency-band wireless digital repeater, first kind wireless points and the second class radio node.Wherein, the first kind radio node and the second class radio node all are used for receiving or the transmitting business data by with the radio-frequency channel of time division duplex in first frequency band or reception of second frequency band or emission; The double frequency-band wireless digital repeater, be used for the business datum from first kind radio node that will on a frequency band of first frequency band and second frequency band, receive, send to the second class radio node by another frequency band in first frequency band and second frequency band, or, the business datum from the second class radio node that receives on will a frequency band in first frequency band and second frequency band sends to first kind radio node by another frequency band in first frequency band and second frequency band.
According to a further aspect of the invention, provide a kind of data transmission method, this method is applied to comprise the wireless communication system of double frequency-band wireless digital repeater, and wherein, this wireless communication system is operated in two time division duplex frequency bands.
Data transmission method according to the present invention comprises: receive the business datum from transmitting terminal on step 1, the double frequency-band wireless digital repeater frequency band in two time division duplex frequency bands;Step 2, wireless digital repeater use another frequency band in two time division duplex frequency bands that business datum is sent to receiving terminal.
A kind of using method of double frequency-band is provided according to a further aspect of the invention.This method comprises the double frequency-band wireless communication system of wireless digital repeater, network side radio node and wireless terminal, wherein, above-mentioned network side radio node and wireless digital repeater communicate, network side radio node and wireless terminal communicate, and wireless digital repeater and wireless terminal communicate.
Using method according to double frequency-band of the present invention comprises: in very first time interval, and the upstream or downstream slot transmission business datum of the radio frames on the frequency band in wireless terminal or the wireless digital repeater use double frequency-band; In second time interval after very first time interval, the upstream or downstream slot transmission business datum of the radio frames on another frequency band in wireless terminal or the wireless digital repeater use double frequency-band.
By above-mentioned at least one scheme of the present invention, by having on the TDD frequency band configuration service channel and control channel rightly at interval at two, resource transmission is dispatched, reduced the propagation delay time that existing TDD wireless digital relaying is introduced, and the feedback delay of existing TDD wireless repeater and communication system, thereby improved the spectrum efficiency of TDD communication system.
Other features and advantages of the present invention will be set forth in the following description, and, partly from specification, become apparent, perhaps understand by implementing the present invention.Purpose of the present invention and other advantages can realize and obtain by specifically noted structure in the specification of being write, claims and accompanying drawing.
Description of drawings
Accompanying drawing is used to provide further understanding of the present invention, and constitutes the part of specification, is used from explanation the present invention with embodiments of the invention one, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the structural representation according to the cell mobile communication systems wireless access mesh portions that comprises the fixed wireless digital repeater of prior art;
A kind of FDD that Fig. 2 A provides for correlation technique is to the structural representation of the wireless digital repeater of TDD conversion;
The structural representation that Fig. 2 B provides for correlation technique at the fixed wireless DTU digital trunk unit of TDD system;
Fig. 3 A is one of schematic diagram of the method that a kind of base station sends data in the prior art to terminal;
Fig. 3 B is two of a kind of base station sends data in a method schematic diagram from the prior art to terminal;
Fig. 3 C be the method that a kind of base station sends data in schematic diagram from the prior art to terminal three;
Fig. 3 D be the method that a kind of base station sends data in schematic diagram from the prior art to terminal four;
Fig. 4 A is one of schematic diagram of the method that another kind of base station sends data in the prior art to terminal;
Fig. 4 B is two of another kind of base station sends data in a method schematic diagram from the prior art to terminal;
Fig. 4 C be the method that another kind of base station sends data in schematic diagram from the prior art to terminal three;
Fig. 4 D be the method that another kind of base station sends data in schematic diagram from the prior art to terminal four;
Fig. 5 is the structured flowchart according to the double frequency-band wireless digital repeater of the embodiment of the invention;
Fig. 6 is the structural representation according to the double frequency-band wireless communication system of the embodiment of the invention;
Fig. 7 is the flow chart according to the data transmission method of the embodiment of the invention;
Fig. 8 is the flow chart according to the using method of the double frequency-band of the embodiment of the invention;
Fig. 9 is the system configuration schematic diagram that embodiment one uses;
Figure 10 is the system configuration schematic diagram that embodiment two uses;
Figure 11 is the structural representation of two frequency bands of use among the embodiment three;
Figure 12 is the flow chart of the communication means of double frequency-band wireless digital repeater among the embodiment three.
Embodiment
Functional overview
As mentioned above, the present invention is directed to the propagation delay time that existing TDD wireless digital relaying is introduced, cause the low problem of spectrum efficiency, proposed a kind of double frequency-band wireless digital repeater, double frequency-band wireless communication system and utilized above-mentioned double frequency-band wireless digital repeater to carry out the method for transfer of data.In above-mentioned double frequency-band wireless digital repeater, frequently be respectively arranged with respectively receive path and the transmission channel that is connected with receiving terminal with transmitting terminal at each, when the business datum that receives on the frequency band of this double-frequency wireless digital repeater in double frequency-band from transmitting terminal, this double-frequency wireless digital repeater sends to receiving terminal by another frequency band in this double frequency-band with this business datum.
Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the present invention, and be not used in qualification the present invention.
According to the embodiment of the invention, a kind of double frequency-band wireless digital repeater at first is provided, this double frequency-band wireless digital repeater is applied to comprise the double frequency-band wireless communication system of the first kind radio node and the second class radio node.
Fig. 5 is the structured flowchart according to the double frequency-band wireless digital repeater of the embodiment of the invention, as shown in Figure 5, double frequency-band wireless digital repeater according to the embodiment of the invention comprises:first antenna 501, second antenna 502, first transmission channel 503 (being TX_B1_A1), first receive path 504 (being RX_B1_A1), second transmission channel 505 (being TX_B2_A1), second receive path 506 (being RX_B2_A1), the 3rd transmission channel 507 (being TX_B1_A2), the 3rd receive path 508 (being RX_B1_A2), the 4th transmission channel 509 (being TX_B2_A2), the 4th receive path 510 (being RX_B2_A2),baseband processing unit 511, resource management andcontrol unit 512, and radio-frequency (RF) switch 513 (has 4 radio-frequency (RF) switch 513-1 to 5134, controlsfirst antenna 501 respectively among Fig. 5, two frequency bands ofsecond antenna 503).Below the joint accompanying drawing is described in detail the structure of this double frequency-band wireless digital repeater.
First transmission channel 503 (TX_B1_A1) is operated in first frequency band, exists radio frequency to be connected withfirst antenna 501; First receive path 504 (RX_B1_A1) is operated in first frequency band, exists radio frequency to be connected withfirst antenna 501; Second transmission channel 505 (TX_B2_A1) is operated in second frequency band, exists radio frequency to be connected withfirst antenna 501; Second receive path 506 (RX_B2_A1) is operated in second frequency band, exists radio frequency to be connected withfirst antenna 501; The 3rd transmission channel 507 (TX_B1_A2) is operated in first frequency band, exists radio frequency to be connected with second antenna 502; The 3rd receive path 508 (RX_B1_A2) is operated in first frequency band, exists radio frequency to be connected with second antenna 502; The 4th transmission channel 509 (TX_B2_A2) is operated in second frequency band, exists radio frequency to be connected with second antenna 502; The 4th receive path 510 (RX_B2_A2) is operated in second frequency band, exists radio frequency to be connected with second antenna 502.
The switching thatfirst antenna 501 is realized between first transmission channel 503 (TX_B1_A1) and first receive path 504 (RX_B1_A1) by radio-frequency (RF)switch 513, and the switching between second transmission channel 505 (TX_B2_A1) and second receive path 506 (TX_B2_A1); The switching that second antenna 502 is realized between the 3rd transmission channel 507 (TX_B1_A2) and the 3rd receive path 508 (RX_B1_A2) by radio-frequency (RF)switch 513, and the switching between the 4th transmission channel 509 (TX_B2_A2) and the receive path (TX_B2_A2).
Wherein, two working bands offirst antenna 501, second antenna 502: the first frequency band B1 and the second frequency band B2 are two non-paired frequency bands that use with time division duplex, in specific implementation process, the first frequency band B1 can be frequency band 1900MHz～1920MHz, and the second frequency band B2 can be frequency band 2010MHz～2025MHz.
In specific implementation process, it is one of following thatfirst antenna 501, second antenna 502 can be respectively:
An aerial array that covers first frequency band and second frequency band, and all independently transmission channel and/or receive path exist radio frequency to connect continuously to each antenna element in this aerial array with one;
A fan antenna that covers first frequency band and second frequency band, and independently transmission channel and/or receive path exist radio frequency to be connected to this fan antenna with one.
In the ordinary course of things, the bandwidth of operation offirst antenna 501, second antenna 502 can cover the first frequency band B1 and the second frequency band B2, when the span between B1 and B2 exceeded the bandwidth offirst antenna 501, second antenna 502,first antenna 501, second antenna 502 can adopt two cover antenna elements to realize.
In specific implementation process, this double frequency-band wireless digital repeater first kind radio node can be wireless terminal, and the second class radio node can comprise a kind of as the situation of sowing: wireless base station or RRU, wireless terminal or wireless digital repeater.
Resource management andcontrol unit 512 are used for obtaining the control information that network issues frombaseband processing unit 511, carry out following management and control, wherein, management and control specifically can comprise one of following or combination in any: control radio frames onfirst antenna 501, second antenna 502 and the synchronized relation between the radio frames on the network side radio node; Control the annexation betweenfirst antenna 501, second antenna 502 and radio frequency unit; Determine whether on the first frequency band B1, to be sent in the needed feedback control information of data of second frequency band B2 transmission, and/or on the second frequency band B2, be sent in the needed feedback information of data of first frequency band B1 transmission; Control the corresponding relation of the uplink and downlink timeslot of the first frequency band B1 onfirst antenna 501 and/or second antenna 502 and the radio frames on the second frequency band B2.Wherein, above-mentioned feedback information comprises a kind of or combination in any of following information: re-send request may information, confirmation of receipt information, scheduling control information.
The above-mentioned double-frequency wireless digital repeater that present embodiment provides can be applied in following two kinds of scenes: 1) as the fixed repeater of cellular mobile communication, install in a fixed manner, first antenna, 501 terminalorienteds (being first kind radio node), second antenna 502 are towards the base station or towards other wireless repeater (i.e. the second class radio node); 2) as the vehicle-mounted mobile repeater of cellular mobile communication,first antenna 501 is installed in the car, terminaloriented, and second antenna 502 is installed in outside the car, towards the base station.
Above-mentioned double frequency-band wireless digital repeater according to the embodiment of the invention provides can send to receiving terminal with the business datum from transmitting terminal that receives on the frequency band on another frequency band.
According to the embodiment of the invention, also provide a kind of double frequency-band wireless communication system.
Fig. 6 is the structural representation according to the double frequency-band wireless communication system of the embodiment of the invention, as shown in Figure 6, the double frequency-band wireless communication system according to the embodiment of the invention comprises: double frequency-band wireless digital repeater 61 (being double frequency-band wireless digital repeater shown in Figure 5), first kind radio node 63 and the second class radio node 65.Wherein, the first kind radio node 63 and the second class radio node 65 all are used for receiving or the transmitting business data by with the radio-frequency channel of time division duplex in first frequency band or reception of second frequency band or emission; Double frequency-band wireless digital repeater 61, be used for the business datum from first kind radio node 63 that will on a frequency band of first frequency band and second frequency band, receive, and send to the second class radio node 65 by another frequency band in first frequency band and second frequency band, or, the business datum from the second class radio node 65 that receives on will a frequency band in first frequency band and second frequency band sends to first kind radio node 63 by another frequency band in first frequency band and second frequency band.
Further, double frequency-band wireless digital repeater 61 also is used for another frequency band by first frequency band and second frequency band, and the reception of the business datum of a frequency band in first frequency band and second frequency band or transmission are fed back or controlled.
Particularly, the first kind radio node 63 and the second class radio node 65 can comprise respectively: a frequency band in first frequency band and second frequency band carries out the reception or the transmission of business datum, and the wireless device that on another frequency band of first frequency band and described second frequency band the reception or the transmission of above-mentioned business datum is fed back or controlled.
Particularly, both comprised the radio-frequency channel that on the first frequency band B1, receives or launch with time division duplex in the above-mentioned first kind radio node 63, also comprise the radio-frequency channel that receives or launch on the second frequency band B2 with time division duplex, the radio-frequency channel of first kind radio node can be with mode reception/emission data on the first frequency band B 1 or the second frequency band B2 of half-or full-duplex.
And the second class radio node 65 can have following two kinds of composition forms:
1) carries out the wireless device that radio frequency and Base-Band Processing are carried out comprehensive Design at two time division duplex frequency band B1 and B2, usually, when B1 and B2 can be covered by the bandwidth of a cover antenna, adopt this composition form;
2) respectively time division duplex frequency band B1 and B2 are carried out two wireless devices of radio frequency and Base-Band Processing design, promptly a wireless device is used for carrying out radio frequency and Base-Band Processing design on frequency band B 1, and another wireless device is used for carrying out radio frequency and Base-Band Processing design on frequency band B2.These two wireless devices can be mounted in same position in specific implementation process, also can be mounted in different positions.Usually, when can not being covered by the bandwidth of a cover antenna, B 1 and B2 adopt this composition form.
When the second class radio node 65 adopts second kind of composition form, double-frequency wireless repeater 61 communicates with two wireless devices of the second class radio node 65 respectively by different frequency bands, in this case, the second class radio node, 65 wireless devices comprise: the base station or the remote radio unit (RRU) that are operated in frequency band B1; Be operated in base station or the remote radio unit (RRU) of frequency band B2.
By the above-mentioned double frequency-band wireless communication system that the embodiment of the invention provides, the business datum that the double-frequency wireless digital repeater can be received sends on different frequency bands.
According to the embodiment of the invention, a kind of data transmission method also is provided, this method is applied to comprise the wireless communication system of above-mentioned double frequency-band wireless digital repeater (being double frequency-band wireless digital repeater shown in Figure 5), can realize by above-mentioned double frequency-band wireless digital repeater and double frequency-band wireless communication system.
Fig. 7 is the flow chart according to the data transmission method of the embodiment of the invention, as shown in Figure 7, mainly comprises following processing (step S701-step S703) according to the data transmission method of the embodiment of the invention:
Step S701: receive business datum on the frequency band of double frequency-band wireless digital repeater in two time division duplex frequency bands from transmitting terminal;
Step S703: wireless digital repeater uses another frequency band in two time division duplex frequency bands that business datum is sent to receiving terminal.
Below further describe the above-mentioned details of respectively handling.
(1) step S701
In said method, transmitting terminal is different radio nodes with receiving terminal, such as, transmitting terminal can be wireless terminal, and receiving terminal can be wireless base station, remote radio unit (RRU), another wireless terminal, wireless digital repeater, and vice versa.
Particularly, step S701 can comprise the processing of following two steps:
Receive radiofrequency signal on step 1, the double frequency-band wireless digital repeater frequency band in two TDD frequency bands from transmitting terminal;
Afterstep 2, the double frequency-band wireless digital repeater also needs to send feedback data to transmitting terminal, to inform whether this business datum of transmitting terminal sends success, for avoiding the delay of feedback data, the double frequency-band wireless digital repeater adopts the frequency band different with received RF signal to send feedback data to transmitting terminal in embodiments of the present invention, therefore, afterstep 2, this method also comprises:
Step 3: the double frequency-band wireless digital repeater is according to the result who radiofrequency signal is carried out the demodulation sign indicating number, and another frequency band in two time division duplex frequency bands sends feedback data to transmitting terminal.
Particularly, the double frequency-band wireless digital repeater can adopt following dual mode to send feedback data to transmitting terminal:
(1) full duplex sends: in the enterprising industry affair of the frequency band Data Receiving of double frequency-band wireless digital repeater in two time division duplex frequency bands, send feedback data to transmitting terminal on another frequency band in two time division duplex frequency bands;
(2) half-duplex sends: another frequency band in two time division duplex frequency bands on to transmitting terminal send feedback data in the interval break time of the enterprising industry affair of the frequency band Data Receiving of double frequency-band wireless digital repeater in two time division duplex frequency bands.
Such as, if transmitting terminal is a wireless terminal, and receiving terminal is the wireless base station, two of each entity work TDD frequency bands are the first frequency band B1 and the second frequency band B2 in the wireless communication system, wireless terminal sends radiofrequency signal on the first frequency band B1, then the double frequency-band wireless digital repeater receives on the first frequency band B1 and comes this radiofrequency signal, then this radiofrequency signal is carried out down-conversion, analog to digital conversion, then this radiofrequency signal is sent to the baseband processing unit of this double frequency-band wireless digital repeater, baseband processing unit carries out demodulation to this radiofrequency signal, decoding, thus the business datum that wireless terminal sends obtained.Then, the double frequency-band wireless digital repeater is managed the result of unit everywhere according to base, in when on the first frequency band B1, receiving or the break time interval from wireless terminal, on the second frequency band B2, send feedback data to wireless terminal, be first receivepath 504 of double frequency-band wireless digital repeater in Fig. 5 receive in the business datums or the break time interval in, send feedback data bysecond transmission channel 505 to wireless terminal.
Particularly, above-mentioned feedback data can comprise one of following or its combination in any: scheduling control information, re-send request may information, channel status or channel quality data.
(2) step S703
Particularly, step S703 can comprise following processing:
Step 1, the double-frequency wireless digital repeater carries out Base-Band Processing to the business datum that needs send; Before sending the business datum that receives to receiving terminal, the baseband processing unit of double-frequency wireless digital repeater carries out Base-Band Processing to the business datum that needs send, and mainly comprises: business datum is carried out chnnel coding, modulation and up-conversion.
The double-frequency wireless digital repeater sends to receiving terminal with business datum, receiving terminal is after receiving business datum, it is carried out demodulation, decoding, send feedback data by the frequency band different to the double-frequency wireless digital repeater then with receiving this business datum, therefore, afterstep 2, this method also comprises:
Step 3, double-frequency wireless digital repeater are used the feedback data of frequency band receptions different with sending above-mentioned business datum in two time division duplex frequency bands from receiving terminal.Such as, if the double-frequency wireless digital repeater sends to receiving terminal by the 4th sendaisle 509 among Fig. 5 with this business datum, then the double-frequency wireless digital repeater is by the feedback data of the 3rd receivepath 510 receptions among Fig. 5 from receiving terminal.
Feedback data is similar to sending, and the double-frequency wireless digital repeater also can be by the feedback data of following two kinds of methods reception from receiving terminal:
(1) full duplex receives: the frequency band of double-frequency wireless digital repeater in using two time division duplex frequency bands receives the feedback data from receiving terminal on another frequency band in two time division duplex frequency bands when receiving terminal sends business datum;
(2) half-duplex receives: the frequency band of double-frequency wireless digital repeater in using two time division duplex frequency bands receives the feedback data from receiving terminal to break time that receiving terminal sends business datum in the interval on another frequency band in two time division duplex frequency bands.
For example, above-mentioned double-frequency wireless digital repeater by the 4th sendaisle 509 among Fig. 5 when receiving terminal sends business datum or in the break time interval, the feedback data that the double-frequency wireless digital repeater receives from receiving terminal by the 3rd receivepath 508, otherwise, if the double-frequency wireless digital repeater by the 3rd sendaisle 507 among Fig. 5 when receiving terminal sends business datum or in the break time interval, the feedback data that the double-frequency wireless digital repeater receives from receiving terminal by the 4th receivepath 510.
In the processing procedure of above-mentioned steps S701 and step S703, when the double-frequency wireless digital repeater communicates with transmitting terminal or receiving terminal simultaneously by two time division duplex frequency bands, TDD radio frames on two frequency bands that use is synchronous, and the part or all of ascending time slot of a radio frames in these two time division duplex wireless frames and the part or all of descending time slot of another one radio frames exists overlapping on time of occurrence or overlap or alternately, or, the part or all of descending time slot of a radio frames in these two time division duplex wireless frames and the part or all of ascending time slot of another one radio frames exists overlapping on time of occurrence or overlap or alternately.Such as, receive business datum on the first frequency band B 1 of double-frequency wireless digital repeater in two time division duplex frequency bands from the wireless base station, and on the second frequency band B2 in two TDD frequency bands when this wireless base station sends feedback data, the part or all of descending time slot of a radio frames in the TDD radio frames on the first frequency band B1 exists overlapping with the part or all of ascending time slot of a radio frames of TDD radio frames on the second frequency band B2 on the time of occurrence or is overlapping or alternately.
Particularly, the TDD radio frames on two frequency bands can adopt following two kinds of methods of synchronization to carry out synchronously:
The frame head of the time division duplex wireless frame on the time division duplex wireless frame on the frequency band in (1) two frequency band and another frequency band aligns;
The time division duplex wireless frame on the frequency band in (2) two frequency bands and the frame head of the time division duplex wireless frame on another frequency band keep a preset time poor.Wherein, this time is closed the cycle less than a radio frames, and in specific implementation process, the value of wireless frame period is generally 5 milliseconds or 10 milliseconds.
According to the above-mentioned data transmission method of the embodiment of the invention, the business datum that receives on the frequency band that exists in the TDD frequency band at interval at two can be sent on another frequency band.
According to the embodiment of the invention, a kind of using method of double frequency-band also is provided, this method is applied to comprise the double frequency-band wireless communication system of wireless digital repeater, network side radio node and wireless terminal, in this system, network side radio node and wireless digital repeater communicate, network side radio node and wireless terminal communicate, and wireless digital repeater and wireless terminal communicate.
Fig. 8 is the flow chart according to the using method of the double frequency-band of the embodiment of the invention, as shown in Figure 8, mainly comprises following processing (step S801-step S803) according to the using method of the double frequency-band of the embodiment of the invention:
Step S801: in very first time interval, wireless terminal or wireless digital repeater are used in the double frequency-band upstream or downstream slot transmission business datum of the radio frames on the frequency band;
Step S803: in second time interval after very first time interval, wireless terminal or wireless digital repeater are used the upstream or downstream slot transmission business datum corresponding with above-mentioned upstream or downstream time slot of the radio frames on another frequency band in the double frequency-band.That is,, then in step S803, use the ascending time slot service data transmission of the radio frames on another frequency band if use the ascending time slot service data transmission of the radio frames on the frequency band among the step S801; If use the descending time slot service data transmission of the radio frames on the frequency band among the step S801, then in step S803, use the descending time slot service data transmission of the radio frames on another frequency band.
Wherein, above-mentioned second time interval can be right after very first time interval, also can have a time interval with very first time interval, and generally speaking, this time interval is less than a wireless frame period.And, be carved into time span between finish time of second time interval during very first time interval initial less than a wireless frame period, perhaps less than a default wireless frame period.
Particularly, two frequency bands can all be the frequency band that uses in the TDD mode in the above-mentioned double frequency-band, also can be that one of them frequency band is the upstream band or the downstream bands of FDD frequency band, the frequency band that another frequency band uses for the TDD mode.
When two frequency bands can all be the frequency band that uses in the TDD mode, for up/descending time slot serial in time of two frequency bands is used, network carries out reverse configuration with the TDD radio frames on two frequency bands to the small part time slot, and wherein, it is one of following that the method for reverse configuration comprises:
(1) frame head of the TDD radio frames on two frequency bands of control aligns in time, and with the descending time slot that is configured to another one TDD radio frames to the time of occurrence interval of small part ascending time slot of one of them TDD radio frames, and the time of occurrence interval to the small part descending time slot of one of them TDD radio frames is configured to another one TDD radio frames ascending time slot the interval overlaid of time of occurrence or overlap mutually;
(2) keep a preset time poor the frame head of the TDD radio frames on two frequency bands, the frame head that is about to the radio frames on two frequency bands part time slot that staggers in time.
In above-mentioned very first time interval, when wireless terminal or wireless digital repeater are used the upstream or downstream slot transmission business datum of the radio frames on the first frequency band B1 in the double frequency-band, relevant feedback or the control data of business datum that transmits on the upstream or downstream slot transmission of this wireless terminal or the wireless digital repeater radio frames on will the second frequency band B2 in this double frequency-band and the very first time interval, particularly, if what service data transmission used is the ascending time slot of the radio frames on the first frequency band B1, then be somebody's turn to do the ascending time slot transmission of feedback or the radio frames of control data on the second frequency band B2; If what service data transmission used is the descending time slot of the radio frames on the first frequency band B1, then be somebody's turn to do the descending time slot transmission of feedback or the radio frames of control data on the second frequency band B2.
And in second time interval, when wireless terminal or wireless digital repeater are used the upstream or downstream slot transmission business datum of the radio frames on the second frequency band B2 in the double frequency-band, relevant feedback or the control data of business datum that transmits on the upstream or downstream slot transmission of this wireless terminal or the wireless digital repeater radio frames on will the first frequency band B1 in this double frequency-band and second time interval.
Wherein, above-mentioned control data comprises: scheduling control information, power control information, mode of operation indicator etc., and feedback data comprises: re-send request may information, channel status or channel quality data etc.
The communication means of the above-mentioned double-frequency wireless digital repeater by the embodiment of the invention can serial use different frequency bands, the flexibility of can the raising system non-symmetrical service being supported.
Below the embodiment of the technique scheme that the embodiment of the invention provided with specific embodiment describe.
Embodiment one
Be user terminal with the transmitting terminal in the present embodiment, the base station of network side is that receiving terminal is an example, and the data transmission method that this bright embodiment is provided describes.
The system configuration schematic diagram that Fig. 9 uses for present embodiment, as shown in Figure 9,user terminal 91 uses two TDD frequency bands (B1 and B2) to pass through double-frequency wirelessdigital repeater 93 to networkside base station 95 service data transmission D1, suppose that in the present embodiment double-frequency wirelessdigital repeater 93 is vehicle-mounted repeaters, this vehicle-mounted repeater connects thebase station 95 of carinterior user terminal 91 and network side, wherein, channel betweenrepeater 93 and thebase station 95 is a quick time-varying channel, becomes channel slowly and the channel betweenrepeater 93 and theuser terminal 91 isone.User terminal 91 sends data D1 tobase station 95 and mainly may further comprise the steps:
Step S901:repeater 93 receives fromuser terminal 91 business datums from a TDD frequency band B2;
Wherein,repeater 93 can receive on TDD frequency band B2 fromuser terminal 91 business datums, uses TDD frequency band B1 to send confirmation of receipt signal or the request repeat signal of D1 touser terminal 91 on antenna A1; Perhaps,repeater 93 also can receive break time fromuser terminal 91 business datums in the interval on TDD frequency band B2, use TDD frequency band B1 to send confirmation of receipt signal or the request repeat signal of D1 touser terminal 91 on antenna A1.
And TDD frequency band B2 and the TDD radio frames on the TDD frequency band B1 that repeater 93 uses are synchronous, and the part or all of descending time slot of the part or all of ascending time slot of the radio frames of TDD frequency band B2 and TDD frequency band B1 is overlapping or overlapping or replace.
This step is equivalent to the step S701 among Fig. 7.
Step S902, repeater send to the base station by another one TDD frequency band B1 with data D1 on antenna A2.
Baseband processing unit in therepeater 93 carries out chnnel coding, modulation with data D1, and then, the D1 after 93 pairs of coded modulation of repeater carries out up-conversion, uses TDD frequency band B1 to send data D1 tobase station 95 on antenna A2.Before data D1 sends tobase station 95,repeater 93 service band B2 on antenna A2 receives the scheduled control data C/F1-2 thatbase station 95 sends, after data D1 sent to, wireless data repeater service band B2 on antenna A2 received data reception acknowledgement data or the request repeat signal C/F1-2 thatbase station 95 sends.
This step is equivalent to the step S703 among Fig. 7.
In order to shorten the relaying time delay,repeater 93 uses on antenna A1 after the transport block set of TDD frequency band B2 in the Transmission Time Interval (TTI) ofuser terminal 91 reception D1, just uses time division duplex frequency band B1 to send tobase station 95 from antenna A2 the D1 data in this transport block set.
According to present embodiment, can shorten the base station by the propagation delay time of repeater when the user terminal to transmit data.
Embodiment two
Be the base station of network side with the transmitting terminal in the present embodiment, receiving terminal is that user terminal is an example, and the data transmission method that this bright embodiment is provided describes.
The system configuration schematic diagram that Figure 10 uses for present embodiment, as shown in figure 10, networkside base station 95 uses two TDD frequency bands (B1 and B2) to pass through double-frequency wirelessdigital repeater 93 touser terminal 91 service data transmission D2, suppose that in the present embodiment double-frequency wirelessdigital repeater 93 is vehicle-mounted repeaters, this vehicle-mounted repeater connects thebase station 95 of carinterior user terminal 91 and network side, wherein, channel betweenrepeater 93 and thebase station 95 is a quick time-varying channel, becomes channel slowly and the channel betweenrepeater 93 and theuser terminal 91 isone.Base station 95 sends data D2 touser terminal 91 and mainly may further comprise the steps:
Step S101:repeater 93 uses the business datum D2 of TDD frequency band B2 reception frombase station 95 on antenna A2;
Wherein,repeater 93 can receive on TDD frequency band B2 from the 95 business datum D2 of base station, uses TDD frequency band B1 to send confirmation of receipt signal or the request repeat signal of D2 tobase station 95 on antenna A2; Perhaps,repeater 93 also can receive break time frombase station 95 business datums in the interval on TDD frequency band B2, use TDD frequency band B1 to send confirmation of receipt signal or the request repeat signal of D2 tobase station 95 on antenna A2.
And TDD frequency band B2 and the TDD radio frames on the TDD frequency band B1 that repeater 93 uses are synchronous, and the part or all of descending time slot of the part or all of ascending time slot of the radio frames of TDD frequency band B2 and TDD frequency band B1 is overlapping or overlapping or replace.
This step is equivalent to the step S701 among Fig. 7.
Step S103,repeater 93 send touser terminal 91 by TDD frequency band B1 with data D2 on antenna A1;
Baseband processing unit in therepeater 93 carries out chnnel coding, modulation with data D2, and then, the D2 after 93 pairs of coded modulation of repeater carries out up-conversion, uses TDD frequency band B1 to send data D2 to terminal 91 on antenna A1.Before sending data D2,repeater 93 uses TDD frequency band B2 to send scheduling controlling instruction C/F2-2 touser terminal 91 on antenna A1, after data D2 sends to terminal 601,repeater 93 uses TDD frequency band B2 to receive data reception acknowledgement data or request repeat signal C/F2-2 thatuser terminal 91 is sent on antenna A1, wherein,user terminal 91 is after receiving business datum D2, to this D2 carry out demodulation, the decoding after, according to the result of demodulation sign indicating number, use TDD frequency band B2 to send data reception acknowledgement data or request repeat signal torepeater 93.
Equally,repeater 93 can use TDD frequency band B1 when terminal 91 sends data D2 on the antenna A1, use TDD frequency band B2 to receive the feedback data thatuser terminal 91 is sent, also can use TDD frequency band B2 to receive the feedback data thatuser terminal 91 is sent in break time that sends data D2 in the interval.
This step is equivalent to the step S703 among Fig. 7.
In order to shorten the relaying time delay,repeater 93 uses on antenna A2 after the transport block set of TDD frequency band B2 in the Transmission Time Interval (TTI) ofbase station 95 reception D2, just uses TDD frequency band B1 to giveuser terminal 91 from A1 the D2 in this transport block set.
According to present embodiment, can shorten the base station by the propagation delay time of repeater when the user terminal to transmit data.
Embodiment three
Present embodiment is with in the communication system of using two TDD frequency bands and communicating, serial is used first frequency band in two TDD frequency bands and second frequency band to communicate to be example, and the specific implementation method of the communication means of the double frequency-band wireless digital repeater of the embodiment of the invention is described.
In this embodiment, the radio node of network side and communicating by letter of double frequency-band wireless digital repeater in the double frequency band-pass communication system; The radio node of network side and wireless terminal communicates by letter in the dual-band systems; The double frequency-band wireless digital repeater is communicated by letter with wireless terminal.
Figure 11 is the structural representation of two frequency bands using in the present embodiment, as shown in figure 11, in the frame period 110 (or 120) of the radio frames of using on first frequency band, there are the time interval 111 of descending time slot formation and thetime interval 112 that ascending time slot constitutes respectively; In the frame period 210 (or 220) of the radio frames of using on second frequency band, there are thetime interval 211 of descending time slot formation and thetime interval 212 that ascending time slot constitutes respectively.
Figure 12 is in the present embodiment, and the flow chart of the communication means of double frequency-band wireless digital repeater as shown in figure 12, mainly may further comprise the steps:
Step S201: network carries out reverse configuration with the TDD radio frames on first frequency band and second frequency band to the small part time slot;
In this embodiment, as shown in figure 11, realize the reverse configuration of two uplink and downlink timeslots on the frequency band by stagger the in time mode of part time slot of the frame head with the radio frames on two frequency bands.
Step S203: in very first time interval, transmit in the descending time slot of the radio frames of double frequency-band wireless digital repeater on first frequency band;
In the present embodiment, as shown in figure 11, very first time interval is the some or all of time in the time interval 111 that constitutes of the descending time slot in frame period 110 (or 812) of the radio frames on first frequency band.Second time interval is the some or all of time in thetime interval 112 that constitutes of the descending time slot in frame period 210 (or 220) of the radio frames on second frequency band.Then transmit in the time interval 111 that the descending time slot in the frame period 110 of the radio frames of double frequency-band wireless digital repeater on first frequency band constitutes.
Step S205: in second time interval, transmit in the descending time slot of the radio frames of double frequency-band wireless digital repeater on second frequency band;
Transmit in thetime interval 112 that descending time slot in the i.e.frame period 210 of the radio frames on second frequency band constitutes;
Return then in the time interval 111 that the descending time slot in frame period 120 of the radio frames of step S203 on first frequency band constitutes and transmit, then, transmit in thetime interval 112 that descending time slot in theframe period 220 of the radio frames on second frequency band constitutes, the serial repeatedly that so circulates uses the resource on first frequency band and second frequency band to launch.
By present embodiment, can serial use the descending time slot of first frequency band and second frequency band to communicate.
Though the invention process describes by using two time division duplex frequency bands, is not limited to this, to using the communication system of three or more time division duplex frequency bands, the technical scheme that the embodiment of the invention provides is suitable equally.
As mentioned above, the technical scheme that provides by the embodiment of the invention, the data of double-frequency wireless digital repeater by will on a frequency band, receiving, send to receiving terminal by another frequency band, the relaying time delay that has occurred when having reduced the wireless digital repeater of using single TDD frequency band, improve feedback speed in the repeated link, thereby improved spectrum efficiency and the transmission rate of under high-speed mobile environment, using the repeater of TDD frequency spectrum; In addition, the method of different frequency bands is used in the serial that provides by the embodiment of the invention, improved the flexibility that system supports non-symmetrical service, can be under the situation of the up-downgoing transfer point that does not change each frequency band, allow terminal obtain and the effect that a radio frames all is configured to uplink and downlink, avoided the up-downgoing asymmetric problem of inter-cell interference that causes in adjacent sub-district under the networking condition.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (24)
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| CN 200810171760CN101729123A (en) | 2008-10-23 | 2008-10-23 | Dual-band wireless digital repeater, wireless communication system and data transmission method |
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