CN101123743B - A cooperative self-adapted retransmission system and method - Google Patents
A cooperative self-adapted retransmission system and method Download PDFInfo
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- CN101123743B CN101123743B CN200710095903.2A CN200710095903A CN101123743B CN 101123743 B CN101123743 B CN 101123743B CN 200710095903 A CN200710095903 A CN 200710095903A CN 101123743 B CN101123743 B CN 101123743B
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Abstract
The invention relates to a cooperative adaptive retransmission system comprising a ground digital television broadcasting emitting unit, a mobile communication base station, a multi-band antenna, a cooperative control unit and a mobile terminal; the multi-band antenna is used to radiate mobile communication signal and broadcasting signal and to receive mobile communication signal; the cooperative control unit is used to control cooperative relation between the ground digital television broadcasting emitting unit and the mobile communication base station; the mobile terminal also includes a television receiving tuner unit and a decoder unit and is used to receive information sent out from the mobile communication base station or the broadcasting signal emitting unit and to feedback receiving activity information to the mobile communication base station. The system provided by the invention is convenient to be realized on the existing system architecture; the invention can realize rapid switching of the mobile terminal between ground digital television broadcasting signal and mobile communication signal; the invention can ensure reliable receipt of digital broadcasting; the invention realizes data download through a ground digital television broadcasting air interface.
Description
Technical field
The present invention relates to the communications field, relate in particular to the system and method that the collaborative ground system of digital television broadcast of cell mobile communication systems is realized cooperative self-adapted repeating transmission.
Background technology
An Evolution Tendency of cell mobile communication systems is to strengthen its content service ability, it is the main contents of content service that multimedia broadcasting and multimedia are downloaded, therefore, increasing multimedia broadcasting, multicast and high-speed downloads ability is the substance of cell mobile communication systems evolution.
The technological approaches that cell mobile communication systems is generally taked for enhancing multimedia broadcasting, multicast-capable has two, an approach is based on the existing transmission rate of system, under the prerequisite of changing as few as possible air interface protocol, increase the support to broadcast, multicast-capable, the benefit of this method is to change little to existing system, shortcoming is the restriction that broadcast, the multicast speed that can provide are subject to existing system design, as for high-speed downloads, as the speed of download of tens MBPSs is provided, this approach is to be beyond one's reach; Another approach is according to multimedia broadcasting, multicast, the needs of high-speed downloads to the speed of eating dishes without rice or wine, redesign new air interface and system configuration, as the mode of 3GPP LTE employing, the benefit of this mode is system configuration and the air interface speed that can obtain more optimizing, but, its shortcoming is that large, the commercial cycle of technical difficulty is long, and is difficult to compatibility with existing system.
Except above-mentioned two evolution paths that are subject at present the cell mobile communication systems of common concern, multi-network cooperative or many standard in combination are the 3rd technology paths that cell mobile communication systems is realized multimedia broadcasting, multicast and high-speed downloads.Here only take the working in coordination with as example of TD-SCDMA system and DMB-T/H system, pass the collaborative method that realizes multimedia broadcasting, multicast and high-speed downloads between cellular mobile communication standard and ground digital television broadcast standard through discussion.
Here mainly the physical channel of TD-SCDMA system and frame structure are illustrated.
The maximum of TD-SCDMA system and other 3G systems is different is that physical-layer techniques is different.The apread spectrum bandwidth of TD-SCDMA is 1.6MHz, and character rate can obtain according to the bit rate of 1.28Mcps and spreading factor.In TD-SCDMA system; the radio frames of 1 10ms can be divided into 2 5ms subframes; each subframe is by the conventional time slot (TS0-TS6) of 7 675us, and corresponding to 101～107 of Fig. 1, and 3 special time slots (descending pilot frequency time slot, protection interval and uplink pilot time slot) form.Conventional time slot is used for transmitting user data or control information, and TS0 (101) always carrys out transmitting system broadcast message as descending time slot regularly, and TS1 (102) is always regularly as ascending time slot.Other conventional time slot can be configured to upstream or downstream as required neatly to realize the transmission of asymmetric traffic, as the transmission of grouped data.As the time slot of up link with as being separated by 1 transfer point between the time slot of down link.In the subframe of each 5ms, be provided with two transfer points, the 1st transfer point is fixed on TS0 end, and the 2nd transfer point depends on the configuration of community uplink and downlink time slot, as shown in Figure 1.
At present, terrestrial DTV transmission has ATSC, DVB and the Japanese ISDB in Europe of the three large standard ，Ji U.S..
" ground digital multimedia and television broadcasting system " is (DMB-T) one of Chinese 5 ground system of digital television broadcast schemes that propose, and this scheme adopts time-domain synchronization OFDM technology (TDS-OFDM).At present, on the basis of DMB-T standard scheme, researching and developing handheld digital TV broadcast (DMB-H) standard scheme.DMB-H standard scheme is compared with European DVB-H standard, has certain advantage, existing also in the development stage.Briefly introduce the feature of DMB-T below.
The system of DMB-T forms.DMB-T transmission system is comprised of functional modules such as host-host protocol, signal processing algorithm and hardware systems.The transmitting terminal structure of system is as shown in Fig. 2 (a).In figure, transport stream TS is through data perturbation 201, error correction coding 202, time domain interweaves/goes here and there and changes 203, inverse fast fourier transform (IFFT) and frequency-domain-interleaving 204, just completed OFDM (OFDM) modulated process of TS, export a string IFFT coefficient, this group IFFT coefficient through parallel serial conversion 205 be transformed into can serial transmission one group of coefficient, this group serial coefficient is again through adding the processing of boundary belt 206, just formed the OFDM frame 211 can anti-multipath disturbing, 207 pairs of OFDM frames 211 of multiplexer and synchronizing information (PN sequence) are carried out multiple connection, what multiplexer was exported is signal frame 212.Signal frame, after shaping filter and D/A conversion 208 processing, is delivered to IF conversion and IF filtering 209, and the signal after 209 up-conversions is delivered to transmitter and sent.
The technical characteristic of DMB-T.The design object of DMB-T is to realize multimedia messages in indoor and outdoor, fixing, mobile and portable One-to-All Broadcast and two-way communication.The multi-carrier modulation technology of the host-host protocol of DMB-T system based on TDS-OFDM, mainly contains following characteristics:
The frame structure of a, classification.See Fig. 2 (b), its frame structure is classification, is divided into signal frame 212, frame group, superframe and day frame.A basic frame structure is called a signal frame.Frame group is defined as 255 signal frames, and its first frame definition is frame group head.Signal frame in frame group has unique frame number, label from 0 to 254, and signal frame number (FN) is encoded in the frame synchronization sequence of current demand signal frame.Superframe is defined as a framing group, and the top layer of frame structure is called superframe group.Superframe is numbered, from 0 to largest frames group number.Hyper Frame Number (SFN) is encoded in first frame group head of superframe together with superframe group number (SFGN).SFGN is defined as the calendar date of superframe pocket transmission, and superframe group be take a consecutive days as the cycle and carried out periodicity and repeat, and it is encoded as the first two byte in first frame group head of a superframe in downgoing line superframe group.At Pacific standard time (PST) or Beijing time 00:00:00AM, physical channel frame structure is reset and starts a new superframe group.The physical channel of DMB-T system is the cycle, and can and Absolute Time Synchronization, thereby can make receiver just start shooting in needs.This means that receiver just enters accepting state in the time of can being designed to only have reception information needed, thereby reach the object of power saving.Its frame structure as shown in Figure 2.
B, Fast synchronization.A signal frame is comprised of frame synchronization and frame two parts.Frame synchronizing signal adopts the pseudo random sequence of walsh codes (Walsh Code), can realize many identification of base stations, and it comprises preamble, PN sequence and rear synchronous.Unlike signal frame in a signal frame group, has different frame synchronizing signals, can utilize frame synchronization to identify signal frame.DMB-T system adopts TDS-OFDM modulation scheme, and the spread spectrum pseudorandom sequence synchronization head that it adopts walsh codes, can realize Fast synchronization.Be about 5ms the lock in time of DMB-T system, and the lock in time of other digital television standard is more than 100ms; And its synchronous antijamming capability is strong, can be synchronous at Trusted recovery under-20dB signal to noise ratio.
C, multi-service are broadcasted more convenient.For the signal frame of each length 500 μ s, set the frame head of unique address, facilitated the identification of data message with separated, there is the technical foundation that merges multi-service broadcast, also will provide synchronous for " two-way interaction ".
The baseband signal of frame is an OFDM (OFDM) piece.An OFDM piece can further be divided into protection interval and a discrete Fourier transform (DFT) piece, as shown in Figure 2.DFT piece has 3780 samplings in its time domain, and they are contrary discrete fourier transforms of 3780 subcarriers in frequency domain.
Patent application CN200510069750, " method and apparatus of converging broadcast service and multicast service in mobile communication system " provides a kind of method and system that multicast service and broadcasting service are provided to user simultaneously, to be supported in the multimedia broadcasting/unicast services (MBMS) in CDMA mobile communication system.Data Generator in broadcast/multicast service center (BM-SC) or in radio network controller (RNC), generate respectively broadcast data and multi-case data for syndication users business, and transmit broadcast data and multi-case data to the user who joins in broadcast session and multicast conversation simultaneously.When at broadcasting service reception period request multicast service, user terminal is set up the dedicated channel for receiving multicast traffic, be kept for the common channel of receiving broadcast service simultaneously, then on common channel, receive broadcast data, in dedicated channel, receive multi-case data simultaneously.
Patent application CN00812174 name is called the method and apparatus that " mobile multi-media terminal of DVB-T and large and cell communication " provides interactive mobile multi-media terminal.This mobile multi-media terminal (being MMT) can enoughly receive broadband traffic such as numerical data broadcasting receivers such as DVB-T.Use such as local or large cell sizes communication link and realize interactivity.Link-local can be WLAN or bluetooth (low power RF transceiver).Large cell sizes communication link can be travelling carriage links such as GSM, CDMA, TDMA.If do not find local tie point, the travelling carriage with Bluetooth link can be used as to the portable base station of ip router or large cell sizes communication.MMT DVB-T reception, numeral is provided, combine to provide the interactivity in mobile environment with communication link.With the MMT communication link of travelling carriage, make it can be as the expanded scope work of this travelling carriage.The method comprises the steps: 1) to digital service supplier solicited message; 2) in broadcast, receive the data-signal from described digital service supplier; 3) decode described data-signal for showing; 4) optimize described data-signal for output; And the signal of showing described optimization is as output.
Motorola Inc. is submitted to third generation partnership projects 3GPP (The thirdGeneration Partnership Project) in February, 2007) technology motion, motion R1-070781, motion title: " for the uplink feedback of the MBMS that strengthens, Uplink Feedback for E-MBMS " having provided a kind of method that is taken defeat signal or be referred to as unsuccessfully confirmation signal (NACK:Notacknowledgment) by terminal to report is: terminal to report to the information that takes defeat of MBMS signal to base station, the corresponding of following several modes carried out in base station: the transmitting power that 1) promotes MBMS, 2) according to the historical data of NACK, determine whether to retransmit MBMS signal, 3) MBMS is carried out to the adjustment of coded system.
The shortcoming of prior art is: can not realize between ground digital television broadcast channel and mobile telecommunication channel and have automatic repeat request.Patent application CN00812174 name is called " mobile multi-media terminal of DVB-T and large and cell communication " and has just provided a kind of method of utilizing cellular mobile communications networks to realize " return " passage of broadcast channel, the efficient repeating transmission automatically in the time of can not solving ground system of digital television broadcast for data broadcast and data download.In addition, Motorola Inc. is submitted to the shortcoming of method described in the technology motion R1-070781 of 3GPP in February, 2007: in the situation that MBMS adopts single frequency network, the local data re-transmitting needing among a small circle, by causing the repeating transmission of whole single frequency network, has caused frequency spectrum waste.
Summary of the invention
The present invention, in order to solve above-mentioned technical problem, provides a kind of cooperative self-adapted retransmission system and method.In described system, set up the synchronized relation between broadcasting channel transmits and mobile communication system transmits, and provide cooperative self-adapted repeating method, to reach following effect: by setting up the synchronized relation between ground digital television broadcast signal and mobile communication signal, can realize terminal at ground digital television broadcast signal, and switch fast between mobile communication signal; Cooperative self-adapted repeating transmission guarantees the reliable reception of data broadcast; By ground digital television broadcast air interface, realizing data downloads.
The invention provides a kind of cooperative self-adapted retransmission system, comprise ground digital television broadcast transmitter unit, mobile communication base station, also comprise multiband aerial or one-segment antenna, Collaborative Control unit and mobile terminal;
Described ground digital television broadcast signal comprises digital multimedia TV broad cast ripple and multicast,
Described multiband aerial, for radiation mobile communication signal and broadcast singal and reception mobile communication signal;
Described Collaborative Control unit, for controlling the conspiracy relation of ground digital television broadcast transmitter unit and mobile communication base station;
Described mobile terminal, also comprises television reception tuner unit and decoder element, for receiving the information of mobile communication base station or the transmission of broadcast signal transmission unit and receiving action message to mobile communication base station feedback.Mobile terminal can be single antenna single receiving channel terminal, can be also many many receive paths of antenna terminals;
Described ground digital television broadcast transmitter unit, also for sending tracking exchage down link signal in ground digital television broadcast frequency range.
Described conspiracy relation comprises that Synchronization Control, Bit allocation are controlled, repeating transmission is controlled automatically.
Described ground digital television broadcast transmitter unit is DMB-T/H system.
Described Collaborative Control unit, also comprises data buffer storage and retransmission process unit, multiple connection control unit and self adaptation repeating transmission control unit;
The data that described data buffer storage and retransmission process unit send the multiplexer by existing system, shaping filter and steering D/A conversion, medium-frequency transformation and intermediate frequency filtering are carried out buffer memory, and determine whether repeating transmission and which is retransmitted data cached according to the control of described self adaptation repeating transmission control unit;
Described multiple connection control unit determines to need in described data buffer storage and retransmission process unit the transmitting time sheet of the data of repeating transmission, and determines retransmission data delivery time according to described transmitting time sheet;
The re-send request may that described self adaptation repeating transmission control unit is sent according to mobile terminal is determined which data of repeating transmission and with which kind of strategy is retransmitted.
Described ground digital television broadcast transmitter unit is DVB-T system.
Described Collaborative Control unit, also comprises and retransmits buffer and automatically retransmit and control:
Described repeating transmission buffer, for carrying out buffer memory to data before the coding that need to send by ground digital television broadcast transmitter unit;
Described automatic repeating transmission is controlled, the re-send request may of sending according to terminal is determined coded system and the retransmission policy of retransmission data, described error correction coding, mapping, frame adaptation are controlled, and the error correction coding mode, modulation system, the frame format that make it to need according to retransmission data send.
The invention provides a kind of cooperative self-adapted repeating method, for according to the request repeat data of mobile terminal, have following steps:
Step 81, by mobile communication frequency range, to network, send arq signal;
Step 82, by mobile communication frequency range or ground digital television broadcast frequency range to the data that send in described mobile terminal retransmit terrestrial digital television broadcasting channel.
In described step 82, send the frequency range that data are used, the idle condition of the size of the data volume of being retransmitted as required by Collaborative Control unit, ground digital television broadcast frequency range and the idle condition of mobile communication frequency range are selected.
When retransmission data amount is very little and described mobile communication channel is idle, use described mobile communication channel to send retransmission data to described mobile terminal; When retransmission data amount is very large and described ground digital television broadcast frequency range is idle, use described ground digital television broadcast frequency range to send retransmission data to described mobile terminal.
In described step 82, mobile communication base station adopts one of following two kinds of modes to the data of terminal transmitting terminal request repeat:
Mode 1: when terminal is during with the mode receiving digital television broadcast signal of timeslice, base station is within the free time of terminal receiving digital television broadcast signal, the passage of terminal receiving digital broadcast is switched on the frequency spectrum of Dedicated Traffic Channel use, and base station is to terminal re-sends data; This mode is applicable to have single channel and twin-channel terminal;
Mode 1: when terminal is during with the mode receiving digital television broadcast signal of Time Continuous, receive the digital television broadcasting retransmission data of sending base station on the frequency spectrum that terminal is used a receive path in its a plurality of (two or more) to use at Dedicated Traffic Channel; This mode is applicable to have the terminal of two or more receive paths.
In described step 82, channel indicating information, before sending to terminal the digital TV broadcast signal that needs to retransmit, is first sent to terminal in mobile communication base station, the concrete channel that the digital TV broadcast signal that this information indication will be retransmitted is used.
Before described step 81, also comprise synchronizing step.
The initial time that described synchronizing step is keeps corresponding relation, for making mobile data and mobile communication wireless frame that described ground digital television broadcast channel sends realize synchronous.
Described corresponding relation is that the initial time of ground digital television broadcast transmitter unit OFDM wireless frame is identical with the initial time of mobile communication wireless frame, and the finish time of ground digital television broadcast transmitter unit OFDM wireless frame is identical with the finish time of mobile communication wireless frame.
Described corresponding relation is to differ an integer time slot between the initial time of ground digital television broadcast transmitter unit OFDM wireless frame and the initial time of mobile communication wireless frame, and differs a described integer time slot between the finish time of ground digital television broadcast transmitter unit OFDM wireless frame and the finish time of mobile communication wireless frame.
The initial time of described ground digital television broadcast transmitter unit OFDM wireless frame is determined by following concrete steps:
Step 151, at the OFDM symbol of the initial row of described ground digital television broadcast transmitter unit OFDM wireless frame, in the duration, insert CDMA signals;
Step 152, by related operation, obtain the correlation peak of CDMA signals;
The time difference Tcorr that step 153, described correlation peak deduct the initial time of described correlation peak and described ground digital television broadcast transmitter unit OFDM wireless frame obtains the initial time of described ground digital television broadcast transmitter unit OFDM wireless frame.
System of the present invention is convenient to realize on existing system framework, and described method both can be used for the collaborative work between multiple types of floors digital television broadcasting system and multiple cell mobile communication systems.Use method of the present invention to go out wideband multimedia wireless system by rapid build.
Accompanying drawing explanation
Fig. 1 is TD-SCDMA physical frame structural representation;
Fig. 2 is ground digital television broadcast emission system structure and frame structure schematic diagram in prior art;
Fig. 3 is that cooperative self-adapted retransmission system provided by the invention forms schematic diagram;
Fig. 4 is the synchronized relation schematic diagram of cooperative self-adapted retransmission system provided by the invention;
Fig. 5 is the ground digital television broadcast transmitter unit schematic diagram with automatic repeating transmission and PN sequence and OFDM symbol multiplexer provided by the invention;
Fig. 6 is the ground digital television broadcast transmitter unit schematic diagram with automatic retransmitting function provided by the invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
First embodiment of the invention has provided cooperative self-adapted retransmission system, as shown in Figure 3, comprise: ground digital television broadcast transmitter unit 308, mobile communication base station 307, Collaborative Control unit 309, multiband aerial 301 and mobile terminal 306, wherein, multiband aerial 301 can enter a part for ground digital television broadcast transmitting antenna, antenna of mobile communication base station, ground digital television broadcast transmitting antenna, antenna of mobile communication base station can be compatibilities, can be also integrated designs.
Ground digital television broadcast transmitter unit 308 sends down link signal 302 to mobile terminal 306 in ground digital television broadcast frequency range 304, mobile terminal 306 is by television reception tuner passage receiving downlink signal 302, while there is mistake in finding down link signal 302, mobile terminal 306 is by the 305 transmission requests recurrent signals 310 of mobile communication frequency spectrum, and request repeat signal 310 is moved communication base station 307 through multiband aerial 301 (or the antenna of mobile communication base station comprising through multiband aerial 301) and receives.Down link 303 retransmission datas of mobile communication frequency spectrum 305 both can, by using down link signal 302 retransmission datas of ground digital television broadcast frequency range 304, also can be passed through to use in mobile communication base station 307.
The conspiracy relation that Collaborative Control unit 309 is controlled between ground digital television broadcast transmitter unit 308, mobile communication base station 307, comprising: control etc. is controlled, automatically retransmitted to Synchronization Control, Bit allocation.
Downlink synchronous signal and the broadcast message of 309 received communication base station 307 transmittings of Collaborative Control unit, thereby realize the frame synchronization and the slot synchronization that at communication base station 307, transmit, simultaneously, Collaborative Control unit 309 receives the signal of ground digital television broadcast transmitter unit 308 transmittings, and the synchronized relation of measuring communication base station 307 transmits and the signal of ground digital television broadcast transmitter unit 308 transmittings, method of measurement as shown in Figure 4.
Terminal 306 is when needs data retransmission, by communication base station 307, to Collaborative Control unit, 309 send arq signal ARQ (ARQ:Automatic Repeat Request), Collaborative Control unit 309, according to the retransmission data amount of the arrival frequency spectrum of arq signal ARQ and ARQ indication, decides and adopts communication base station 307 or adopt ground digital television broadcast transmitter unit 308 retransmission datas.When using communication base station 307 retransmission data, communication base station 307 takes out data and according to the mode of Collaborative Control unit 309 regulations, uses down link 303 retransmission datas of mobile communication frequency spectrum 305 from data storage and retransmission process unit.
Mobile terminal 306 is with the Receiver And Transmitter that is operated in mobile communication frequency range, and with the Digital Television tuner and the decoder that are operated in ground digital television broadcast frequency range.Terminal can be the terminal of any standard, as WCDMA, TD-SCDMA, GSM, CDMA2000, PHS etc., tuner be can compound any ground digital television broadcast standard tuner, as DVB-H/T, DMB-T/H.
Ground digital television broadcast transmitter unit 308 can be the transmitter unit of compound any ground system of digital television broadcast standard, comprising: the DMB-T/H of the DVB-T/H in the ATSC of the U.S., Europe, the ISDB of Japan, China;
Mobile communication base station 307 can be any mobile communication system, comprises GSM, WCDMA, TD-SCDMA, PHS etc.When being applied to ground digital television broadcast single frequency network, in order to guarantee the independence of the mobile communication business between adjacent cell, need to insert the mobile communication signal based on CDMA in the ground digital television broadcast channel time-division.
As shown in Figure 4, concrete mode is the synchronous method of the cooperative self-adapted retransmission system that second embodiment of the present invention provides: the initial time of the initial time of the mobile data sending in ground digital television broadcast channel and mobile communication wireless frame keeps definite corresponding relation.
As shown in Figure 4, in figure, mobile communication wireless frame 401 is comprised of subframe 402a, 402b synchronous method in cooperative self-adapted retransmission system, and subframe 402a, 402b comprise respectively again several time slots (as the TS0～TS6 in figure).Ground digital television broadcast transmitter unit OFDM radio frames 403 symbols 404 by some OFDM modulations (OFDM) form, in the situation that the ground digital television broadcast transmitting antenna that Fig. 3 provides, antenna of mobile communication base station location altogether, in order to realize ground digital television broadcast transmitter unit and mobile communication synchronizeing on interface aloft, the initial time 406 of ground digital television broadcast transmitter unit OFDM radio frames 403 and the initial time 407 of mobile communication wireless frame 401 will keep strict corresponding relation.
The initial time 406 of ground digital television broadcast transmitter unit OFDM radio frames 403 and the initial time 407 of mobile communication wireless frame 401 will keep strict corresponding relation can adopt various ways: a kind of corresponding relation is that the initial time 406 of ground digital television broadcast transmitter unit OFDM radio frames 403 and the initial time 407 of mobile communication wireless frame 401 are same moment, and the finish time 408 of described OFDM radio frames 403 and the finish time 409 of described mobile communication wireless frame 401 are same moment; A kind of corresponding relation is to differ an integer time slot (being the time width of several TS0) between the initial time 406 of ground digital television broadcast transmitter unit OFDM radio frames 403 and the initial time 407 of mobile communication wireless frame 401, and also differs same number of time slots between the finish time 408 of described OFDM radio frames 403 and the finish time 409 of described mobile communication wireless frame 401;
In order to determine the initial time 406 of ground digital television broadcast transmitter unit OFDM radio frames 403, a kind of method is to insert CDMA signal in the OFDM symbol duration of the initial row of ground digital television broadcast transmitter unit OFDM radio frames 403, by related operation, obtain the correlation peak 410 of CDMA signal, correlation peak 410 guarantees to be the value of a decision with the time difference Tcorr of the initial time 406 of OFDM radio frames 403 by designing in advance the inserted mode of Pseudo-Random Noise Code (PN) code.A kind of existing inserted mode is shown in Fig. 2 (b), before frame 211, inserts PN sequence as frame synchronizing signal, and this frame synchronizing signal forms signal frame 212 together with frame 211.Receiver in this locality, produce one with the identical pseudo noise code of PN sequence of inserting in frame, and use this pseudo noise code to carry out relevant search to TV receiving signal, correlation peak appears near the initial time 406 of OFDM radio frames 403, and the time that the initial time 406 of OFDM radio frames 403 differs is Tcorr.
In searching for out correlation peak 410, deducting time difference Tcorr is exactly the initial time 406 of OFDM radio frames 403, according to the corresponding relation of the initial time 407 of the initial time 406 of foregoing ground digital television broadcast transmitter unit OFDM radio frames 403 and mobile communication wireless frame 401, just can accurately know the initial time 407 of mobile communication wireless frame 401, thereby can be synchronized to rapidly in the air interface of mobile communication.
In order to send the information of more mobile communication from ground digital television broadcast transmitter unit OFDM radio frames 403, the cell broadcast information of mobile communication can be added in OFDM radio frames 403 at the mode with spread spectrum, a kind of mode is the interior insertion spread-spectrum signal of start-up portion 405 in ground digital television broadcast transmitter unit OFDM radio frames 403, the mode of inserting spread-spectrum signal can be single carrier spread-spectrum signal, can be also the spread-spectrum signal based on OFDM.
The 3rd embodiment of the present invention provided the ground digital television broadcast transmitter unit with self adaptation retransmitting function.This ground digital television broadcast transmitter unit is in existing ground digital television broadcast transmitter unit---DMB-T/H system, as shown in Fig. 2 (a), in added data buffer storage and retransmission process unit 501, multiple connection control unit 502, automatically retransmit control unit 503 and form, as shown in Figure 5.
Wherein, the 501 pairs of data that send by multiplexer 207, shaping filter and D/A conversion 208, IF conversion and IF filtering 209 in data buffer storage and retransmission process unit are carried out buffer memory, and determine whether repeating transmission and which is retransmitted data cached according to the control of automatic repeating transmission control unit 503;
Automatically the re-send request may that repeating transmission control unit 503 is sent according to mobile terminal 306 is determined those data of repeating transmission and with which type of strategy is retransmitted;
Multiple connection control unit 502, for needing the transmitting time sheet of the data of repeating transmission to determine in data buffer storage and retransmission process unit 501, determines the delivery time of retransmission data according to transmitting time sheet.
In actual applications, described data buffer storage and retransmission process unit 501, multiple connection control unit 502, automatically retransmit control unit 503 and can be included in Collaborative Control unit 309.
A kind of existing ground digital television broadcast transmitter unit---the basic functional units of DVB-T system as shown in Figure 6; comprise: error correction coding 602, shine upon 603, frame adaptation 604, IFFT605, insertion protection interval 606, D/A 607, data by error correction coding 602, shine upon 603, frame adaptation 604, insert pilot tone and control parameter 608, IFFT 605, insert protection interval 606, D/A 607 is sent to transmission channel after processing.
A kind of ground digital television broadcast transmitter unit with automatic retransmitting function is to have added in above-mentioned existing system: retransmit buffer 601, automatically retransmit and control 609.
Before retransmitting 601 pairs of codings that need to send by ground digital television broadcast transmitter unit of buffer, data are carried out buffer memory; when needs are retransmitted; again the part that needs in these data to retransmit by error correction coding 602, shine upon 603, frame adaptation 604, IFFT605, insertion protection interval 606, D/A607, data by error correction coding 602, shine upon 603, frame adaptation 604, insert pilot tone and control parameter 608, IFFT605, insertion protection interval 606, D/A607 and be sent to transmission channel after processing.
Automatically retransmit and control coded system and the retransmission policy that 609 re-send request may of sending according to terminal are determined retransmission data, and the coded system needing according to retransmission data and retransmission policy to error correction coding 602, shine upon 603, frame adaptation 604 controls, make it to send according to the needed error correction coding mode of retransmission data, modulation system, frame format.
In actual applications, described repeating transmission buffer 601, automatic repeating transmission are controlled 609 and can be included in Collaborative Control unit 309.
The 4th embodiment of the present invention provided a kind of collaborative automatic repeating method.The data that send in ground digital television broadcast channel are realized to the method for retransmitting to be comprised:
The 1st step, sends arq signal by mobile communication frequency range to network;
The 2nd step, logical mobile communication frequency range, or by ground digital television broadcast frequency range, to the data that send in terminal re-sends ground digital television broadcast channel.
Mobile communication base station adopts one of following two kinds of modes to the data of terminal transmitting terminal request repeat:
Mode 1: when terminal is during with the mode receiving digital television broadcast signal of timeslice, base station is within the free time of terminal receiving digital television broadcast signal, the passage of terminal receiving digital broadcast is switched on the frequency spectrum of Dedicated Traffic Channel use, and base station is to terminal re-sends data; This mode is applicable to have single channel and twin-channel terminal;
Mode 2: when terminal is during with the mode receiving digital television broadcast signal of Time Continuous, receive the digital television broadcasting retransmission data of sending base station on the frequency spectrum that terminal is used a receive path in its a plurality of (two or more) to use at Dedicated Traffic Channel; This mode is applicable to have the terminal of two or more receive paths.
Channel indicating information, before sending to terminal the digital TV broadcast signal that needs to retransmit, is first sent to terminal in mobile communication base station, the concrete channel that the digital TV broadcast signal that this information indication will be retransmitted is used.
Judgement need to be retransmitted mode, the passage that data volume size, the idle condition of ground digital television broadcast channel, the idle condition of mobile communication frequency range of retransmitting as required comes Selective resending data to use;
When retransmission data amount is very little and mobile communication channel is idle, use mobile communication channel to send retransmission data to mobile terminal;
When retransmission data amount is very large and during ground digital television broadcast channel idle, use ground digital television broadcast channel to send retransmission data.
In sum, system of the present invention is convenient to realize on existing system framework, and described method both can be used for the collaborative work between multiple types of floors digital television broadcasting system and multiple cell mobile communication systems.Use method of the present invention to go out wideband multimedia wireless system by rapid build.
Those skilled in the art is not departing under the condition of the definite the spirit and scope of the present invention of claims, can also carry out various modifications to above content.Therefore scope of the present invention is not limited in above explanation, but determined by the scope of claims.
Claims (15)
1. a cooperative self-adapted retransmission system, in described system, set up that ground digital television broadcast channel transmits and mobile communication signal between synchronized relation, described system comprises ground digital television broadcast transmitter unit, mobile communication base station, it is characterized in that, also comprise multiband aerial, Collaborative Control unit and mobile terminal;
Described multiband aerial, for radiation mobile communication signal and broadcast singal and reception mobile communication signal;
Described Collaborative Control unit, for controlling the conspiracy relation of ground digital television broadcast transmitter unit and mobile communication base station, described conspiracy relation comprises that Synchronization Control, Bit allocation are controlled, repeating transmission is controlled automatically;
Described mobile terminal, also comprises television reception tuner unit and decoder element, for receiving the information of mobile communication base station or the transmission of ground digital television broadcast transmitter unit and receiving action message to mobile communication base station feedback;
Described mobile terminal, also for sending arq signal by mobile communication frequency range to network;
Described mobile communication base station, for the data that send to described mobile terminal retransmit terrestrial digital television broadcasting channel by mobile communication frequency range or ground digital television broadcast frequency range.
2. cooperative self-adapted retransmission system as claimed in claim 1, is characterized in that, described ground digital television broadcast transmitter unit, also for sending tracking exchage down link signal in ground digital television broadcast frequency range.
3. cooperative self-adapted retransmission system as claimed in claim 1, is characterized in that, described ground digital television broadcast transmitter unit is DMB-T/H system.
4. cooperative self-adapted retransmission system as claimed in claim 1, is characterized in that, described Collaborative Control unit also comprises data buffer storage and retransmission process unit, multiple connection control unit and self adaptation repeating transmission control unit;
The data that described data buffer storage and retransmission process unit send the multiplexer by existing system, shaping filter and steering D/A conversion, medium-frequency transformation and intermediate frequency filtering are carried out buffer memory, and determine whether repeating transmission and which is retransmitted data cached according to the control of described self adaptation repeating transmission control unit;
Described multiple connection control unit determines to need in described data buffer storage and retransmission process unit the transmitting time sheet of the data of repeating transmission, and determines retransmission data delivery time according to described transmitting time sheet;
The re-send request may that described self adaptation repeating transmission control unit is sent according to mobile terminal is determined which data of repeating transmission and with which kind of strategy is retransmitted.
5. cooperative self-adapted retransmission system as claimed in claim 1, is characterized in that, described ground digital television broadcast transmitter unit is DVB-T system.
6. cooperative self-adapted retransmission system as claimed in claim 1, is characterized in that, described Collaborative Control unit also comprises and retransmits buffer and automatically retransmit and control:
Described repeating transmission buffer, for carrying out buffer memory to data before the coding that need to send by ground digital television broadcast transmitter unit;
Described automatic repeating transmission is controlled, the re-send request may of sending according to terminal is determined coded system and the retransmission policy of retransmission data, error correction coding, mapping, frame adaptation are controlled, and the error correction coding mode, modulation system, the frame format that make it to need according to retransmission data send.
7. a cooperative self-adapted repeating method, for according to the request repeat data of mobile terminal, set up that ground digital television broadcast channel transmits and mobile communication signal between synchronized relation, it is characterized in that there are following steps:
Step 81, described mobile terminal send arq signal by mobile communication frequency range to network;
Step 82, mobile communication base station by mobile communication frequency range or ground digital television broadcast frequency range to the data that send in described mobile terminal retransmit terrestrial digital television broadcasting channel.
8. cooperative self-adapted repeating method as claimed in claim 7, it is characterized in that, in described step 82, mobile communication base station is in the following way to the data of terminal transmitting terminal request repeat: when terminal is during with the mode receiving digital television broadcast signal of timeslice, base station is within the free time of terminal receiving digital television broadcast signal, the passage of terminal receiving digital broadcast is switched on the frequency spectrum of Dedicated Traffic Channel use, and base station is to terminal re-sends data; This mode is applicable to have single channel and twin-channel terminal.
9. cooperative self-adapted repeating method as claimed in claim 7, it is characterized in that, in described step 82, mobile communication base station is in the following way to the data of terminal transmitting terminal request repeat: when terminal is during with the mode receiving digital television broadcast signal of Time Continuous, terminal is used on a frequency spectrum using at Dedicated Traffic Channel in its a plurality of receive paths and received the digital television broadcasting retransmission data of sending base station; This mode is applicable to have the terminal of two above receive paths.
10. cooperative self-adapted repeating method as claimed in claim 7, it is characterized in that, in described step 82, mobile communication base station is before sending to terminal the digital TV broadcast signal that needs to retransmit, first to terminal, send channel indicating information, the concrete channel that the digital TV broadcast signal that this information indication will be retransmitted is used;
In described step 82, the frequency range that mobile communication base station retransmission data is used, the size of data volume, the idle condition of the idle condition of ground digital television broadcast frequency range and mobile communication frequency range retransmitted are as required selected.
11. cooperative self-adapted repeating methods as claimed in claim 10, is characterized in that, when retransmission data amount is very little and described mobile communication frequency range is idle, use described mobile communication frequency range to send retransmission data to described mobile terminal; When retransmission data amount is very large and described ground digital television broadcast frequency range is idle, use described ground digital television broadcast frequency range to send retransmission data to described mobile terminal.
12. cooperative self-adapted repeating methods as claimed in claim 7, it is characterized in that, described synchronizing step refers to that initial time keeps corresponding relation, for making mobile data and mobile communication wireless frame that described ground digital television broadcast channel sends realize synchronous.
13. cooperative self-adapted repeating methods as claimed in claim 12, it is characterized in that, described corresponding relation is that the initial time of ground digital television broadcast transmitter unit OFDM wireless frame is identical with the initial time of mobile communication wireless frame, and the finish time of ground digital television broadcast transmitter unit OFDM wireless frame is identical with the finish time of mobile communication wireless frame.
14. cooperative self-adapted repeating methods as claimed in claim 12, it is characterized in that, described corresponding relation is to differ an integer time slot between the initial time of ground digital television broadcast transmitter unit OFDM wireless frame and the initial time of mobile communication wireless frame, and differs a described integer time slot between the finish time of ground digital television broadcast transmitter unit OFDM wireless frame and the finish time of mobile communication wireless frame.
15. cooperative self-adapted repeating methods as described in claim 13 or 14, is characterized in that, the initial time of described ground digital television broadcast transmitter unit OFDM wireless frame is determined by following concrete steps:
Step 151, at the OFDM symbol of the initial row of described ground digital television broadcast transmitter unit OFDM wireless frame, in the duration, insert CDMA signals;
Step 152, by related operation, obtain the correlation peak of CDMA signals;
The time difference Tcorr that step 153, described correlation peak deduct the initial time of described correlation peak and described ground digital television broadcast transmitter unit OFDM wireless frame obtains the initial time of described ground digital television broadcast transmitter unit OFDM wireless frame.
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| CN1571487A (en) * | 2004-04-30 | 2005-01-26 | 清华大学 | Mobile terminal receiving multimedia television broadcasting |
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| CN1571487A (en) * | 2004-04-30 | 2005-01-26 | 清华大学 | Mobile terminal receiving multimedia television broadcasting |
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