CN101123469A - A method and system for interposing mobile communication signals in ground digital TV broadcast channel - Google Patents
A method and system for interposing mobile communication signals in ground digital TV broadcast channel Download PDFInfo
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- CN101123469A CN101123469A CNA2006100892023A CN200610089202A CN101123469A CN 101123469 A CN101123469 A CN 101123469A CN A2006100892023 A CNA2006100892023 A CN A2006100892023A CN 200610089202 A CN200610089202 A CN 200610089202A CN 101123469 A CN101123469 A CN 101123469A
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Abstract
The present invention relates to a method for inserting mobile communication signals into a terrestrial digital television-broadcasting channel. The mobile communication signals are inserted into the time slots of the terrestrial digital television-broadcasting channel by the method of time division, so that the interference between the mobile communication signals and the broadcasting signals can be avoid; mobile communication carrier waves are inserted into the time slots of the terrestrial digital television-broadcasting channel by the method of frequency division for realizing the communication by utilizing the frequency spectrum resources of the terrestrial digital television-broadcasting channel. The method can be used for the cooperative work between various terrestrial digital television-broadcasting systems and various cellular mobile communication systems and can rapidly construct a wireless broadband multimedia system.
Description
Technical field
The present invention relates to the communications field, relate in particular to synergetic structure and method between ground system of digital television broadcast and the cell mobile communication systems.
Background technology
An evolution trend 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 air interface protocol as few as possible, increase support to broadcasting, multicast-capable, the benefit of this method is to change little to existing system, shortcoming is the restriction that broadcasting, the multicast speed that can provide are subjected to the 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 high-speed downloads needs to the speed of eating dishes without rice or wine, redesign new air interface and system configuration, mode as 3GPP LTE employing, the benefit of this mode is system configuration and the air interface speed that can more be optimized, but, its shortcoming is that big, the commercial cycle of technical difficulty is long, and is difficult to compatibility with existing systems.
Except above-mentioned two evolution paths that are subjected to the cell mobile communication systems of common concern at present, 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 be example only with the collaborative of TD-SCDMA system and DMB-TH system, mainly physical channel and the frame structure to the TD-SCDMA system is illustrated, and passes the method for collaborative realization multimedia broadcasting, multicast and high-speed downloads between cellular mobile communication standard and the ground digital television broadcast standard through discussion.
The TD-SCDMA system is different with the maximum different physical-layer techniques that are of other 3G systems.The apread spectrum bandwidth of TD-SCDMA is 1.6MHz, and character rate can obtain according to bit rate and the spreading factor of 1.28Mcps.In the TD-SCDMA system; the radio frames of 1 10ms can be divided into 2 5ms subframes; each subframe is made up of corresponding to 101～107 and 3 special time slots (descending pilot frequency time slot, protection interval and uplink pilot time slot) of Fig. 1 the conventional time slot (TS0-TS6) of 7 675us.Conventional time slot is used for transmitting user data or control information, and TS0 101 always comes the 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 transmission of packet data.As the time slot of up link with as separating by 1 transfer point between the time slot of down link.Be provided with two transfer points in the subframe of each 5ms, the 1st transfer point is fixed on TS0 end, and the 2nd transfer point then depends on the configuration of sub-district uplink and downlink time slot, as shown in Figure 1.
Except that descending pilot frequency (DwPTS) and ascending pilot frequency (UpPTS) burst, the burst of other message transmission that are useful on all has identical structure: be made up of 2 data parts, 1 training sequence code and 1 guard time sheet.Data division is distributed in the two ends of training sequence symmetrically.The duration of 1 burst is exactly 1 time slot.The data division of burst is by channel code and the common spread spectrum of scrambler.Channel code is an Orthogonal Variable Spreading Factor OVSF (OVSF), and the spreading factor value can get 1,2,4,8 or 16, and the data rate of physical channel depends on the used spreading factor value that ovsf code adopted.
In the TD-SCDMA system, 1 basic training sequence code of the general use in each sub-district.This basic training sequence code is carried out isometric cyclic shift (length depends on the number of users of same time slot) can obtain a series of training sequence again.The different user of same time slot will use different training sequence displacements.Therefore, a physical channel is by the common definition of all multi-parameters such as frequency, time slot, channel code, training sequence displacement and radio frames distribution.When setting up a physical channel, also just provided its initial configuration.The duration of physical channel can endless, also can be to distribute the defined duration.
The support to new technologies such as smart antenna and uplink synchronous has been considered in the design of TD-SCDMA system frame structure.The frame length of a TDMA is 10ms, is divided into two 5ms subframes.The structure of these two subframes is identical.Each subframe is divided into 7 conventional time slots and 3 special time slots that length is 675us again.These three special time slots are respectively DwPTS, GP and UpPTS.In 7 conventional time slots, TS0 always distributes to down link, and TS1 always distributes to up link.Separate by transfer point in the time of between ascending time slot and the descending time slot.In the TD-SCDMA system, the subframe of each 5ms has two transfer points.By disposing the number of uplink and downlink timeslot flexibly, make TD-SCDMA be applicable to up-downgoing symmetry and non-symmetrical service pattern.
DwPTS in each subframe is as descending pilot frequency and Synchronization Design.This time slot is that the downlink synchronous sequence SYNC-DL of 64 chips and the protection of 32 chips are formed at interval by length.SYNC-DL is one group of PN sign indicating number, is used to distinguish neighbor cell, system definition 32 code characters, every group of corresponding SYNC-DL sequence, SYNC-DL PN sign indicating number collection gathers at cellular network can be multiplexing.
UpPTS in each subframe is for setting up uplink synchronous design, when UE is in aerial registration and at random during access state, it will at first launch UpPTS, after obtaining the replying of network, sends access channel (RACH) immediately.This time slot is that the uplink synchronous sequence SYNC-UL of 128 chips and the protection of 32 chips are formed at interval by length.SYNC-UL is one group of PN sign indicating number, is used for distinguishing different UE at access procedure.
GP (in Node B side), by emission at interval to the protection of accepting conversion.Duration is 75us (96 chip), can be used for determining that basic coverage radius of cell is 11km.Bigger protection time slot can prevent to disturb between uplink and downlink signals mutually, can also allow terminal to carry out some times in advance when sending uplink synchronizing signals.
In TDMA, each carrier frequency is defined as a tdma frame, is equivalent to a channel in the FDMA system, every frame comprises 8 time slots (TS0-TS7), tdma frame number is arranged, and this is because one of characteristic of GSM is that customer confidentiality is good, by before transmission information information being encrypted realization.The algorithm that calculates ciphering sequence is number to be an input parameter with tdma frame, so each frame all must have a frame number.There have been tdma frame number, travelling carriage just can judge that it is that control channel TS0 goes up what transmit for which kind of logic channel.
Tdma frame number is the loop cycle numbering with 3.5 hours (2715648 tdma frames).Per 2715648 tdma frames are a Hyperframe, each Hyperframe can be divided into 2048 superframes again, and a superframe duration is 6.12s, and each superframe is made up of multi-frame again and is comprised 26 tdma frames, continue duration 120ms, 51 such multi-frames are formed a superframe.This multi-frame is used to carry Traffic Channel (TCH), slow associated control channel (SACCH) and adds quick associated control channel (FACCH).The multi-frame of 51 tdma frames continues duration 3060/13ms.26 such multi-frames are formed a superframe.This multi-frame is used to carry broadcast channel (BCH) and is total to public control channel (CCCH).
At present, the terrestrial DTV transmission has three big standards, i.e. the ISDB of the DVB in the ATSC of the U.S., Europe and Japan.
" ground digital multimedia and television broadcasting system " is one of Chinese 5 ground system of digital television broadcast schemes that propose (DMB-T), 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 broadcasting (DMB-H) standard scheme.The DMB-H standard scheme is compared with European DVB-H standard, has certain advantage, now also is in the development stage.Briefly introduce the characteristics of DMB-T below.
The system of DMB-T forms.The DMB-T transmission system is made up of functional modules such as host-host protocol, signal processing algorithm and hardware systems.The transmitting terminal structure of system is shown in Fig. 2 (a).Among the 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 finished the 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 that can anti-multipath disturbs; 207 pairs of OFDM frames 211 of multiplexer and synchronizing information (PN sequence) are carried out multiple connection, and what multiplexer was exported is signal frame 212.After signal frame process shaping filter and D/A conversion 208 are handled, deliver to intermediate frequency (IF) conversion and IF filtering 209, deliver to transmitter through the signal after 209 up-conversions and send.
The technical characteristic of DMB-T.The design object of DMB-T is to realize that multimedia messages is in indoor and outdoor, fixing, mobile and portable One-to-All Broadcast and two-way communication.The host-host protocol of DMB-T system mainly contains following characteristics based on the multi-carrier modulation technology of TDS-OFDM:
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.The frame group is defined as 255 signal frames, and its first frame definition is a frame group head.Signal frame among the 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 the 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 with superframe group number (SFGN).SFGN is defined as the calendar date of superframe pocket transmission, and the superframe group is to carry out periodicity the cycle to repeat with a consecutive days, and it is encoded as preceding two bytes in first frame group head of a superframe among the downgoing line superframe group.At Pacific standard time (PST) or Beijing time 00:00:00AM, physical channel frame structure is reset and begins a new superframe group.The physical channel of DMB-T system is the cycle, and can and Absolute Time Synchronization, thereby receiver is just started shooting in needs.This means that receiver just enters accepting state in the time of can being designed to have only the reception information needed, thereby reach purpose of power saving.Its frame structure as shown in Figure 2.
B, synchronous fast.A signal frame is made up 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 back synchronously.Unlike signal frame among the signal frame group has different frame synchronizing signals, can utilize frame synchronization that signal frame is discerned.The DMB-T system adopts the TDS-OFDM modulation scheme, and the spread spectrum pseudorandom sequence synchronization head that it adopts walsh codes can realize fast synchronously.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 under-20dB signal to noise ratio reliable the recovery synchronously.
C, multi-service broadcasting is more convenient has set the frame head of unique address for the signal frame of each length 500 μ s, the identification that makes things convenient for data message with separate, have and merge the technical foundation that multi-service is broadcasted, 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.The DFT piece has 3780 samplings in its time domain, they are contrary discrete fourier transforms of 3780 subcarriers in the frequency domain.
Patent application CN200510069750, " method and apparatus of polymerization broadcasting service and multicast service in the mobile communication system " provides a kind of and provides the method and system of multicast service and broadcasting service simultaneously to the user, to be supported in the multi-medium broadcast/group broadcast service (MBMS) in the CDMA mobile communication system.In broadcast/multicast service center (BM-SC) or the Data Generator in radio resource controller (RNC), generate respectively and be used for the broadcast data and the multi-case data of syndication users business, and transmit broadcast data and multi-case data simultaneously to the user who joins in broadcast session and the multicast conversation.When at broadcasting service reception period request multicast service, user terminal is set up the dedicated channel that is used for receiving multicast traffic, be kept for the common channel of receiving broadcast service simultaneously, on common channel, receive broadcast data simultaneously then, on dedicated channel, receive multi-case data.
Patent application CN00812174 name is called the method and apparatus that " mobile multi-media terminal of DVB-T and big 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 big cell sizes communication link and realize interactivity.Link-local can be WLAN (wireless local area network) or bluetooth (low power RF transceiver).Big cell sizes communication link can be such as travelling carriage links such as GSM, CDMA, TDMA.If do not find local tie point, the travelling carriage of band Bluetooth link can be used as the portable base station of ip router or big cell sizes communication.MMT with DVB-T receive, numeral shows, combining with communication link provides interactivity in the mobile environment.The MMT communication link that has a travelling carriage makes it can be as the expanded scope work of this travelling carriage.This method comprises the steps: 1) to digital service supplier solicited message; 2) in broadcasting, receive data-signal from described digital service supplier; 3) the described data-signal of decoding is for showing; 4) optimize described data-signal for output; And the signal of showing described optimization is as output.
In following wireless communication system,, constitute compound air interface in order to realize under the different channels environment different modulation systems, coded system, multiplex mode need being combined in appropriate mode to the optimization service of different mobile status terminals.Compound air interface also is that future broadband wireless communication systems realizes self-organizing, tissue and the needed interface shape of multi-network cooperative mutually.
Patent application US2004/0141481A1 " uses emitter and the launching technique (Transmitter Device and Transmiting Method Using OFDM andMC-CDMA) of OFDM and MC-CDMA ", emitter and air interface implementation method that a kind of OFDM of employing combines with CDMA have been provided, as shown in Figure 1, compound air interface among the figure comprises several radio frames 101,102,103 etc., a radio frames (Frame), as 102,103, be divided into several slots, OFDM modulation system (as QAM) can be taked in these time slot the insides, also can one adopt MC-CDMA mode (as BPSK), terminal under the different channels environment is arranged to different time slots, transmitter is according to appropriate mode, from 64QAM to QAM,, transmit to terminal to BPSK.The ITU-R WP8F Document 8F/TEMP/31-E that holds in October, 2003, the air interface mode that " the technological trend report Technology Trends " the inside that provides among the 11th Meeting of WorkingParty 8F Edinburgh advises patent application US2004/0141481A1 is described is as the trend of doing following air interface technologies development.
As for OFDM pilot frequency design (Pilot Pattem), had at present and numerous in the OFDM modulation, inserted pilot frequency sequence, except at present at IEEE 802.11a, and among the IEEE802.16x, adopted multiple pilot interposition method, existing pilot interposition method can be divided into two kinds of fundamental types, and a class is to insert fixing pilot frequency design in time domain and/or frequency domain; One class is to insert adaptive pilot frequency design in time domain and/or frequency domain.People such as Sinem Coleri are at document " channel estimation technique of arranging based on pilot tone in the ofdm system (Channel Estimation Techniques Based on Pilot Arrangement inOFDM Systems) ", see IEEE TRANSACTIONS ON BROADCASTING, Vol.48, No.3, September 2002, in to basic OFDM pilot interposition method, insert as comb shape, piece shape is inserted and is described, the common feature of these OFDM pilot tones is to choose the go out implantation site of some specific time frequency unit as pilot signal, these time frequency unit can be along time orientation continuously or the time period on some subcarrier of choosing discontinuously (OFDM symbol period), also can be along frequency direction continuously or the time period on some subcarrier of choosing discontinuously (OFDM symbol period).
Number of patent application is 20060018279, and the technology that name is called " frame structure (Frame structures for a wireless communication system with multipleradio technologies) that adopts the wireless communication system of multiple wireless technology " announcement is:
The frame structure that present patent application provides is: a plurality of time slots (SLOT) are formed a frame, and a plurality of frames are formed an outer frame (outer-frame), and a plurality of outer frames are formed a superframe.Time slot in the outer frame both can be used for up link, also can be used for down link, the wireless technology that each time slot adopts can different (as being W-CDMA, also can be OFDM), in an outer frame of forming superframe, physical channel takies a time slot in the frame at least.
The launching technique that present patent application provides is: each descending OFDM time slot is produced the OFDM modulation waveform and it is multiplexed into this OFDM time slot the inside, each descending W-CDMA time slot is produced the W-CDMA modulation waveform and it is multiplexed into this W-CDMA time slot the inside, each physical channel is launched in the mode of burst (burst), and the time slot allocation of each physical channel and code modulation mode can change between superframe.
Number of patent application is 20060013186, and name is called " the improved wireless communication system of broadcast coverage (Wireless communication system with improved broadcast coverage) " and provides a kind of method of improving wireless system broadcast singal coverage by pilot interlace and Cyclic Delay Diversity.Increasing the basic measures that cover is that OFDM symbols transmitted is introduced the cycle time-delay duration (cyclic delay durations), implementation method is that each OFDM symbol is chosen a cycle time-delay duration in pseudorandom mode, and the principle of choosing is that the cycle time-delay duration of this sub-district is constantly to change with respect to the adjacent sub-district cycle time-delay duration.A kind of launching technique that the present invention provides is to adopt an antenna to send to OFDM symbol and W-CDMA waveform, and the another kind of launching technique that the present invention provides is to adopt plural antenna to send to OFDM symbol and W-CDMA waveform.
Number of patent application is 20050286482, and name is called a kind of base station of OFDM symbol and terminal supported that " in the CDMA2000 system support OFDM method and apparatus (Apparatus and method for supporting OFDM operation in aCDMA2000wireless network) " provide and supports the method for OFDM symbol to be in the CDMA signal structure: to the control method of CDMA pilot channel with to the method for OFDM symbol encoding and decoding.Radio frequency sending set is at CDMA pilot channel the inside emission CDMA pilot data, at the 2nd CDMA Channel the inside emission OFDM symbol.
Number of patent application is 20050249177, the method that name is called " mixed wireless communications system (Hybrid wirelesscommunications system) " is that radio frames is divided into several slots, in first's time slot, use the CDMA modulation transmissions, in the part 2 time slot, adopt the OFDM modulation transmissions.
Number of patent application is 20050063345, name is called method that " embed OFDM method and system (System and method for embedding OFDM in CDMA systems) " provide in cdma system be the OFDM Packet Data Channel to be added to launch on the CDMA Channel, channel is that unit is dispatched with the time slot between a plurality of users, when realizing, CDMA Packet Data Channel and OFDM Packet Data Channel are dispatched together.CDMA Channel is used public scrambler, and the OFDM Packet Data Channel is superimposed upon on the CDMA Channel, and the OFDM grouped channels does not use public scrambler scrambling.CDMA Packet Data Channel of the present invention and OFDM Packet Data Channel all are based on (SLOT) of time slot, and a time slot of the present invention both can be the CDMA time slot, also can be the OFDM time slots, also can be the shared time slots of OFDM and CDMA.
Patent US6417890, the purpose that name is called the use PN sequence that " being used for the pilot modulated method (Modulation of pilot tone amplitude in DTV broadcast for faster channelacquisition) that the digital television broadcasting channel is caught fast " provide is to accelerate the catching of training sequence, and accelerate to be used for balanced superposed signal synchronously.Concrete grammar is and pseudo random sequence of TV signal synchronized transmissions, and this sequence amplitude does not cause interference to television broadcasting signal much smaller than television broadcasting signal, has and the characteristics of existing receiver compatibility.
Patent US6437832, " (the stack ultra-broadband signal is used to suppress multipath Mitigation of multipath using ultra wideband DTV overlay signal on digital broadcasting-television signal) ", the method that the present invention provides is to use with the ultra-broadband signal of digital TV broadcast signal stack and realizes the dynamic estimation of channel multi-path and multipath inhibition fast and effectively.The purpose of this technology is similar with patent US6417890 with method, difference be used herein be ultra-broadband signal, what patent US6417890 used is general spread-spectrum signal.
Patent application CN03157387, the feature of " utilizing frequency domain PN sequence pilot frequency to obtain the method for thick frequency offset estimating " is: the method for utilizing frequency domain PN sequence pilot frequency to obtain frequency offset estimating belongs to ofdm system modulation-demodulation technique field, and it is characterized in that: it is the thick frequency deviation estimating method that the good autocorrelation of a kind of PN of utilization sequence is judged the subcarrier spacing integral multiple; Frequency domain inserts pilot frequency sequence according to certain subcarrier spacing, promptly the PN sequence allocation is arrived each pilot tone point; At receiving terminal thereby transmission sequence and local PN time domain sequences by channel are multiplied each other to judge above the frequency spectrum whether have peak value to occur at the subcarrier point,, then know the position of thick frequency deviation if a peak value appears in this point.This method can obtain integer frequency offset comparatively accurately under low signal to noise ratio, thereby provides reliable foundation for the thick compensate of frequency deviation of system.Implementation method is: at transmitting terminal, frequency domain inserts pilot frequency sequence according to certain subcarrier spacing, adopts different symbol when promptly the PN sequence allocation being fallen each pilot tone point; At receiving terminal, signal that receives and local PN time domain sequences are multiplied each other, judge its result's spectral characteristic, whether the place peak value occurs at the subcarrier spacing integral multiple, if a peak value appears in the place of this subcarrier, can judge that then this position is the position of thick frequency deviation.
What patent application CN01124144 name was called that " in the orthogonal FDM modulation system protection at interval fill method " provide replaces protection (zero protection at interval) and realize the method for transmission signals anti-multipath at interval with the PN sequence, and the transmission signals section timing estimation method that begins and finish.Each signal frame sequence has pseudorandom m sequence PN, and received signal and PN sequence constitute convolution signal, deducts beginning and the end of going to discern the PN sequence behind the convolution signal from received signal.The PN sequence is used for substituting of regularly recovery, carrier wave recovery, channel estimating, frame synchronization and OFDM protection interval.
The shortcoming of prior art is: the method for using existing CDMA and OFDM to mix can construct descending flexibly air interface, constitutes the Frequency Division Duplexing (FDD) link structure between existing ground digital television broadcast channel and the mobile telecommunication channel but can not directly make.Patent application CN00812174 name is called " mobile multi-media terminal of DVB-T and big and cell communication " and has just provided a kind of method of utilizing cellular mobile communications networks to realize " return " passage of broadcast channel, does not solve the method for inserting the cellular mobile communication down link in the ground digital television broadcast broadcast channel.
Summary of the invention
In order to solve above-mentioned technical problem, the invention provides a kind of frequency division duplex system and method for time division multiplexing broadcasting channel, its purpose is, by in the ground digital television broadcast broadcast channel, inserting the cellular mobile communication down link, and it is (perhaps further ground digital television broadcast signal and the emission of mobile communication signal colocation site, is ground digital television broadcast sender unit and mobile communication signal emitter comprehensive Design one covering device), make mobile communication system can utilize the frequency spectrum of ground digital television broadcast and the frequency spectrum of mobile communication to constitute a pair of Frequency Division Duplexing (FDD) link.
The invention provides the method for inserting mobile communication signal in a kind of ground digital television broadcast channel,
Concrete grammar is:
In the time slot of ground digital television broadcast channel, insert mobile communication signal, to avoid the interference between mobile communication signal and the broadcast singal by the time-division mode;
In the time slot of ground digital television broadcast channel, insert the mobile communication carrier wave, be used to utilize the frequency spectrum resource of ground digital television broadcast channel to realize communication by the frequency division mode.
The mobile communication signal that inserts by the time-division mode in the described ground digital television broadcast channel time slot constitutes the down channel of portable terminal.
The up channel of described down channel correspondence is realized in the mobile communication frequency spectrum.
Described mobile communication carrier wave carries pilot frequency information.
The signal of mobile communication signal that issues in the described ground digital television broadcast channel and mobile communication system emission keeps synchronously.
The concrete steps of described signal Synchronization are that the time slot that needs in the ground digital television broadcast to insert movable signal is alignd with the initial time slot of mobile communication system radio frames or wireless sub-frame.
Described mobile communication signal also comprises cell broadcast information, and described cell broadcast information uses the described mobile communication carrier wave that issues in the ground digital television broadcast channel to send, to reduce the power consumption of terminal.
The cell broadcast information that sends in the cell broadcast information that described mobile communication carrier wave sends and the sequence of time slots of mobile communication system physical frame is consistent on time and content.
When the portable terminal receiving broadcast content, the described mobile communication carrier wave that portable terminal issues by the ground digital television broadcast channel and other people who receives same program carry out real-time communication, to realize mutual between the program recipient.
The invention provides a kind of method of reseptance of ground digital television broadcast signal, concrete grammar is:
When portable terminal received the ground digital television broadcast signal, portable terminal was closed mobile communication frequency range receiver, kept synchronously by receiving the cell broadcast information that the ground digital television broadcast channel sends and the down link signal of mobile communication periodically;
When portable terminal received paging signal in the cell broadcast information that the ground digital television broadcast channel sends, portable terminal sent response signal by the transmitter that it is operated in the mobile communication frequency range to the mobile communication base station again.
The invention provides the system that inserts mobile communication signal in a kind of ground digital television broadcast channel, comprise the DMB-TH system, also comprise:
Mobile communication baseband signal processing unit with the multiplexer of described DMB-TH system links to each other is used for the base band signal process to mobile communication system;
With mobile communication signal and the digital broadcast signal multiple connection control unit that the multiplexer of described DMB-TH system links to each other, be used for the mobile communication signal that inserts the ground digital television broadcast channel is carried out multiple connection control.
Described mobile communication system is the TD-SCDMA mobile communication system.
The characteristics that the shaping filter of described DMB-TH system and mould/transformation of variables module are inserted at the TD-SCDMA multicarrier have taked to suppress the measure of peak-to-average force ratio.
The characteristics that the medium-frequency transformation of described DMB-TH system and intermediate frequency filtering module are inserted at the TD-SCDMA multicarrier have taked to suppress the measure of peak-to-average force ratio.
Synchronizing information, the out of Memory module of described DMB-TH system add in the transmission control parameters of ground digital television broadcast and are used to insert the needed information of mobile communication signal.
Describedly be used to insert the needed information of mobile communication signal and comprise: mobile communication signal insert position, width, the cycle information of time slot and/or be used to control described DMB-TH system and and described TD-SCDMA base stations in mobile communication system between the size of collaborative frame of systematic collaboration relation.
System of the present invention is convenient to realize that described method both can be used for the collaborative work between multiple ground system of digital television broadcast and the multiple cell mobile communication systems on the existing system framework.Use method of the present invention can construct the wideband multimedia wireless system fast.Reach following effect by a kind of like this Frequency Division Duplexing (FDD) link:, thereby can use broadcast spectrum and mobile communication frequency spectrum flexibly, efficiently the part of ground digital television broadcast frequency spectrum as the required frequency spectrum of bidirectional mobile communication; The tracking exchage CDMA signal that use is inserted in the ground digital television broadcast frequency spectrum is realized carrying out interaction according to content between the broadcast reception person in the single frequency network; By in the ground digital television broadcast signal, synchronously inserting the broadcast message of mobile radio communication with mobile radio communication, guarantee that terminal need not the mobile communication channel is monitored when receiving ground digital television broadcast, save power, and can switch to mobile telecommunication channel fast.
Description of drawings
Fig. 1 is a TD-SCDMA physical frame structure;
Fig. 2 is existing ground digital television broadcast emission system structure and frame structure;
Fig. 3 is that the collaborative system of ground digital television broadcast provided by the invention and mobile communication forms;
Fig. 4 is the method that digital ground digital television broadcasting channel provided by the invention and mobile telecommunication channel constitute Frequency Division Duplexing (FDD);
Fig. 5 is the method for digital ground digital television broadcasting channel provided by the invention and a plurality of mobile telecommunication channels of middle insertion;
Fig. 6 is the method for synchronous of digital ground digital television broadcasting channel provided by the invention and mobile telecommunication channel;
Fig. 7 is the implementation method that the mobile communication system modulation signal inserts the ground system of digital television broadcast of ability that has provided by the invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
First embodiment that the present invention provides as shown in Figure 3, it is the frequency division duplex system that this present invention provides, comprise: ground digital television broadcast transmitter unit 308, mobile communication base station 307, Collaborative Control unit 309, multiband aerial 301 and portable terminal 306, wherein, multiband aerial 301 can be further divided into 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 that install common location, also can be integrated designs.
The downlink synchronous signal and the broadcast message of 309 received communication base stations, 307 emissions of Collaborative Control unit, thereby be implemented in frame synchronization and slot synchronization that communication base station 307 is transmitted, simultaneously, Collaborative Control unit 309 receives the signal of ground digital television broadcast transmitter unit 308 emissions, and measure the synchronized relation of communication base station 307 transmits and the signal of ground digital television broadcast transmitter unit 308 emissions, method of measurement as shown in Figure 4.
Ground digital television broadcast transmitter unit 308 sends tracking exchage down link signal 302 with the ground digital television broadcast signal in time-multiplexed mode on ground digital television broadcast frequency range 304, portable terminal 306 is by television reception tuner passage receiving downlink signal 302, then, portable terminal 306 is by mobile communication frequency spectrum 305 transmission of uplink signals, and this signal is moved communication base station 307 through multiband aerial 301 (perhaps to antenna of mobile communication base station 301b) and receives.Ground digital television broadcast frequency range 304 transmitting down link signals 302 both can be passed through in mobile communication base station 307, also can pass through mobile communication frequency spectrum 305 transmitting downstream signals 303.
Conspiracy relation between Collaborative Control unit 309 control ground digital television broadcast transmitter units 308, the mobile communication base station 307 comprises: Synchronization Control, insertion periodic Control, coded system control etc.
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-TH 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 the ground digital television broadcast single frequency network, in order to guarantee the independence of the mobile communication business between the adjacent sub-district, need be at the mobile communication signal of ground digital television broadcast channel time-division insertion based on CDMA.
Second embodiment of the invention has provided the method for inserting mobile communication signal in a kind of ground digital television broadcast channel.Given method is: adopt time-multiplexed mode, as shown in Figure 4, such benefit is to avoid mobile communication signal, as CDMA signal or other signals, and the interference between the broadcast singal.
At the particular time-slot of ground digital television broadcast channel 401, in the 403a among the figure, 403b, insert mobile communication signal, among Fig. 4 as the 404a/404b among the figure by the time-division mode.The ground digital television broadcast signal of ground digital television broadcast channel 401 transmission can be by a plurality of subcarriers (signal that the OFDM (OFDM) of f0～fn) forms is modulated, also can be the signal that adopts other modulation format, as the signal of vestigial sideband modulation;
Particular time-slot at ground digital television broadcast channel 401 inserts mobile communication signal by the time-division mode, as the 404a/404b among the figure, constitute the down channel of mobile communication terminal 306, the up channel corresponding with this down channel need be realized in mobile communication frequency spectrum 305.The sequence of time slots 402 of mobile communication system physical frame can be the time slot of TDD system, also can be the time slot of up channel in the FDD system.Up channel, is made of as 405a～405g a part of time slot in the sequence of time slots 402 that constitutes the mobile communication system physical frame.The mobile communication signal that inserts is as the down link of mobile communication, and uses between the up link of mobile communication frequency spectrum can be complete Frequency Division Duplexing (FDD), also can be Half-Frequency Division Duplex.When time slot as portable terminal 306 down channels, as 404a/404b, with time slot as portable terminal 306 up channels, as 405a/405e, between the time go up when overlapping, just constituted complete Frequency Division Duplexing (FDD), when the time staggers, as as between the ascending time slot outside 404a/404b and the 405a/405e, just constitute Half-Frequency Division Duplex (being similar to gsm system).
Further, in the particular time-slot of the ground digital television broadcast channel 401 in Fig. 4, in the 403a among the figure, 403b, can insert a plurality of mobile communication carrier waves by the frequency division mode, as shown in Figure 5, insert 501a, 502a, 503a in the time slot 403a among the figure, inserted 501b, 502b, 503b in the time slot 403b among the figure.The identical time slot of the up channel of a plurality of carrier wave correspondences that these insert in the particular time-slot of same ground digital television broadcast channel 401 in can the sequence of time slots 402 of corresponding mobile communication system physical frame, the different time slot in also can the sequence of time slots 402 of corresponding mobile communication system physical frame.
Further, except the data of carrying, also carry pilot frequency information, as shown in Figure 6 in a plurality of mobile communication carrier waves that insert in the ground digital television broadcast channel 401,601 o'clock subcarriers among the figure carry the timeslice of data, and 602 and 603 is timeslices that subcarrier carries pilot tone.The timeslice of carrying pilot tone can be in the front of the timeslice of carrying data, also can be in the back of the timeslice of writing track data.
Further, carry out according to specific synchronized relation between the signal of mobile communication signal that issues in the ground digital television broadcast channel 401 and mobile communication system emission, just keep synchronized relation between the sequence of time slots 402 of mobile communication signal that issues in the ground digital television broadcast channel 401 and mobile communication system physical frame, a kind ofly realize that this synchronous method is: allowing needs to insert the time slot of mobile communication signal in the ground digital television broadcast channel 401, as the 403a among the figure, 403b, align with the initial time slot of radio frames or wireless sub-frame in the mobile communication system sequence of time slots 402, as shown in Figure 6, wherein, as the time slot 403a of the mobile communication signal that issues in the ground digital television broadcast channel 401, the starting point of 403b and be strict alignment as the starting point of the 405a/405e of the initial time slot of subframe.
Third embodiment of the invention has provided the method for inserting the mobile communication cells broadcast message in a kind of ground digital television broadcast channel, according to the physical frame length in the mobile communication system sequence of time slots 402, frame combination to ground digital television broadcast is adjusted, the method of adjusting is: the unit that introduces collaborative frame, collaborative frame is made up of time slot and several time slots that comprise mobile communication signal that several comprise the OFDM symbol, the number of the OFDM symbol that comprises in the collaborative frame, signal frame 212 numbers that perhaps comprise depend on the frame length (being generally 10ms) that uses in the mobile communication system, usually, the slot length 403a sum that takies of the mobile communication signal of the time span of collaborative frame and the insertion frame length that equals to use in the mobile communication system.Synchronized relation is simplified between a plurality of mobile communication carrier wave 501a that issue in such corresponding relation assurance mobile communication system time slot and the ground digital television broadcast channel 401,502a, the 503a.The base unit of collaborative frame is OFDM symbol period (perhaps this cycle being referred to as time slot), and wherein the part of O FDM cycle is used to send mobile communication signal; Collaborative frame is made up of time slot and several time slots that comprise mobile communication signal that several comprise the OFDM symbol.When the frame combination of ground digital television broadcast is adjusted, the part time slot of the frame of ground digital television broadcast combination the inside is used to send mobile communication signal, thereby constitutes collaborative frame.Cell broadcast information is inserted in the time slot of the mobile communication signal that collaborative frame comprises, cell broadcast information can be inserted into the interior any position of mobile communication time slot of collaborative frame, for with existing mobile communication system compatibility, usually adopt the method that existing mobile communication frame structure is split arrangement, as, for the TD-SCDMA system, timeslice 601 is as the time that sends TS0, face sends cell broadcast information during this period, and the timeslice 602 after 601 sends down-going synchronous DwPTS signal.The radio frames of collaborative frame and mobile communication system occurred with the identical cycle, and in the mobile communication time slot of collaborative frame, cell information and business datum are sent periodically.
Among a plurality of mobile communication carrier wave 501a that issue in the ground digital television broadcast channel 401,502a, the 503a, choose a cell broadcast information that sends in the mobile communication system, send cell broadcast information as using mobile communication carrier wave 502a.Keep mobile communication carrier wave 502a to send the broadcast message strict conformance on time, content that sends in the sequence of time slots 402 of cell broadcast information and mobile communication system physical frame during transmission.
The 4th embodiment of the present invention provided a kind of method of reseptance of ground digital television broadcast signal, when portable terminal 306 receives the ground digital television broadcast signal, portable terminal 306 is closed the receiver of mobile communication frequency range, by receiving the cell broadcast information that the ground digital television broadcast channel sends periodically, as the cell broadcast information of using mobile communication carrier wave 502a to send, come to keep synchronously with the down link signal 302 of mobile communication system.Because portable terminal has been closed a receiver, has reached the effect of terminal power saving.
When the paging signal in the cell broadcast information that the mobile communication carrier wave 502a that sends in the ground digital television broadcast channel that portable terminal 306 receives sends, portable terminal 306 sends response signal by the transmitter that it is operated in the mobile communication frequency range to the base station again.
Fifth embodiment of the invention has provided a kind of voice signal method of multicasting, when portable terminal receives the broadcasted content of ground digital television broadcast channel 401, one or more and other people that receive same program among a plurality of mobile communication carrier wave 501a that portable terminal 306 can issue by ground digital television broadcast channel 401,502a, the 503a carry out the voice real-time communication, realize the interaction between the program recipient.
Sixth embodiment of the invention has provided a kind of composition of realizing with the collaborative DMB-TH system of TD-SCDMA, as shown in Figure 7.Mobile communication baseband signal processing unit 701 among Fig. 7 and mobile communication signal and digital broadcast signal multiple connection control unit 702 are at original system, shown in Fig. 2 (a), in increase newly be used for insert mobile communication signal at the wide channel 401 of broadcasting, i.e. time slot 101 in the TD-SCDMA system and TD-SCDMA descending pilot frequency, TD-SCDMA downlink data.
Shaping filter among the figure and D/A (D/A) conversion 208 ' and IF conversion and IF filtering 209 ' with original system, shown in Fig. 2 (a), the difference of middle shaping filter and D/A conversion 208, IF conversion and IF filtering 209 is the characteristics at the insertion of TD-SCDMA multicarrier, shaping filter and D/A conversion 208, IF conversion and IF filtering 209 have been done optimal design, taked to suppress the measure of peak-to-average force ratio, as digital pre-distortion technology.
Further, in order to make the correct demodulation of receiver, synchronizing information, other information 210 are in the transmission control parameters of ground digital television broadcast, as add inserting needed information among the TPS, as mobile communication signal insert position, width, the cycle information of time slot 403a, 403b and/or be used to control as described in the DMB-TH system and and as described in the size etc. of the collaborative frame of systematic collaboration relation between the TD-SCDMA base stations in mobile communication system.
In sum, system of the present invention is convenient to realize that described method both can be used for the collaborative work between multiple ground system of digital television broadcast and the multiple cell mobile communication systems on the existing system framework.Use method of the present invention can construct the wideband multimedia wireless system fast.
Those skilled in the art can also carry out various modifications to above content under the condition that does not break away from the definite the spirit and scope of the present invention of claims.Therefore scope of the present invention is not limited in above explanation, but determine by the scope of claims.
Claims (16)
1. insert the method for mobile communication signal in the ground digital television broadcast channel, it is characterized in that:
In the time slot of ground digital television broadcast channel, insert mobile communication signal, to avoid the interference between mobile communication signal and the broadcast singal by the time-division mode;
In the time slot of ground digital television broadcast channel, insert the mobile communication carrier wave, be used to utilize the frequency spectrum resource of ground digital television broadcast channel to realize communication by the frequency division mode.
2. insert the method for mobile communication signal in the ground digital television broadcast channel as claimed in claim 1, it is characterized in that, the mobile communication signal that inserts by the time-division mode in the described ground digital television broadcast channel time slot constitutes the down channel of portable terminal.
3. insert the method for mobile communication signal in the ground digital television broadcast channel as claimed in claim 2, it is characterized in that the up channel of described down channel correspondence is realized in the mobile communication frequency spectrum.
4. insert the method for mobile communication signal in the ground digital television broadcast channel as claimed in claim 1, it is characterized in that described mobile communication carrier wave carries pilot frequency information.
5. insert the method for mobile communication signal in the ground digital television broadcast channel as claimed in claim 1, it is characterized in that, the signal of mobile communication signal that issues in the described ground digital television broadcast channel and mobile communication system emission keeps synchronously.
6. insert the method for mobile communication signal in the ground digital television broadcast channel as claimed in claim 5, it is characterized in that the concrete steps of described signal Synchronization are that the time slot that needs in the ground digital television broadcast to insert movable signal is alignd with the initial time slot of mobile communication system radio frames or wireless sub-frame.
7. insert the method for mobile communication signal in the ground digital television broadcast channel as claimed in claim 1, it is characterized in that, described mobile communication signal also comprises cell broadcast information, described cell broadcast information uses the described mobile communication carrier wave that issues in the ground digital television broadcast channel to send, to reduce the power consumption of terminal.
8. insert the method for mobile communication signal in the ground digital television broadcast channel as claimed in claim 7, it is characterized in that the cell broadcast information that sends in the cell broadcast information that described mobile communication carrier wave sends and the sequence of time slots of mobile communication system physical frame is consistent on time and content.
9. insert the method for mobile communication signal in the ground digital television broadcast channel as claimed in claim 1, it is characterized in that, when the portable terminal receiving broadcast content, the described mobile communication carrier wave that portable terminal issues by the ground digital television broadcast channel and other people who receives same program carry out real-time communication, to realize mutual between the program recipient.
10. the method for reseptance of a ground digital television broadcast signal is characterized in that:
When portable terminal received the ground digital television broadcast signal, portable terminal was closed mobile communication frequency range receiver, kept synchronously by receiving the cell broadcast information that the ground digital television broadcast channel sends and the down link signal of mobile communication periodically;
When portable terminal receives terrestrial DTV wide when broadcasting paging signal in the cell broadcast information that channel sends, portable terminal sends response signal by the transmitter that it is operated in the mobile communication frequency range to the mobile communication base station again.
11. insert the system of mobile communication signal in the ground digital television broadcast channel, comprise the DMB-TH system, it is characterized in that, also comprise:
Mobile communication baseband signal processing unit with the multiplexer of described DMB-TH system links to each other is used for the base band signal process to mobile communication system;
With mobile communication signal and the digital broadcast signal multiple connection control unit that the multiplexer of described DMB-TH system links to each other, be used for the mobile communication signal that inserts the ground digital television broadcast channel is carried out multiple connection control.
12. insert the system of mobile communication signal in the ground digital television broadcast channel as claimed in claim 11, it is characterized in that described mobile communication system is the TD-SCDMA mobile communication system.
13. insert the system of mobile communication signal in the ground digital television broadcast channel as claimed in claim 12, it is characterized in that, the shaping filter of described DMB-TH system and mould/transformation of variables module have taked to suppress the measure of peak-to-average force ratio at the characteristics that the TD-SCDMA multicarrier inserts.
14. insert the system of mobile communication signal in the ground digital television broadcast channel as claimed in claim 12, it is characterized in that, the medium-frequency transformation of described DMB-TH system and intermediate frequency filtering module have taked to suppress the measure of peak-to-average force ratio at the characteristics that the TD-SCDMA multicarrier inserts.
15. insert the system of mobile communication signal in the ground digital television broadcast channel as claimed in claim 12, it is characterized in that synchronizing information, the out of Memory module of described DMB-TH system add and be used to insert the needed information of mobile communication signal in the transmission control parameters of ground digital television broadcast.
16. insert the system of mobile communication signal in the ground digital television broadcast channel as claimed in claim 15, it is characterized in that, describedly be used to insert the needed information of mobile communication signal and comprise: mobile communication signal insert position, width, the cycle information of time slot and/or be used to control described DMB-TH system and and described TD-SCDMA base stations in mobile communication system between the size of collaborative frame of systematic collaboration relation.
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| CN101720062B (en) * | 2009-11-13 | 2012-06-20 | 清华大学 | System fusing broadband wireless communication and TV broadcasting service |
| CN102972057A (en) * | 2010-03-31 | 2013-03-13 | 索尼公司 | Method of reducing interference and corresponding base station, network and system |
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| CN102972057A (en) * | 2010-03-31 | 2013-03-13 | 索尼公司 | Method of reducing interference and corresponding base station, network and system |
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