CN101083663A - Data transmission method of mobile multimedia system - Google Patents
Data transmission method of mobile multimedia system Download PDFInfo
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- CN101083663A CN101083663A CN 200710118259 CN200710118259A CN101083663A CN 101083663 A CN101083663 A CN 101083663A CN 200710118259 CN200710118259 CN 200710118259 CN 200710118259 A CN200710118259 A CN 200710118259A CN 101083663 A CN101083663 A CN 101083663A
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Abstract
The method includes following steps: (1) partitioning each frame into 36 time slots; (2) in time for sending each frame of data, the method sends first beacon with a length 853 micro second at 0th time slot at first, and then sends 53 pieces of OFDM symbols; (3) in subsequent first to 35th time slots, the method sends a second beacon with a length 853.8 micro second at first in each time slot, and sends 53 pieces of OFDM symbols in sequence. The procedure for sending OFDM symbols includes steps: first, sending out a circulation prefix with length 98.4 micro second; and then sending out data body with length 409.6 micro second. Being able to implement frequency planning and area coverage planning in high smartly, the invention increases coverage area of network in single frequency greatly so as to overcomes disadvantages that the current GY/T 220.1-2006 standard cannot realizes medium and large coverage area of network in single frequency.
Description
Technical field
The present invention relates to the mobile multimedia broadcast system field, be specifically related to a kind of data transmission method for uplink of mobile multi-medium system.
Background technology
The announced GY/T 220.1-2006 of China national General Bureau of Radio, Film and Television standard, be the first of CMMB (ChinaMobile M μ ltimedia Broadcasting, China Mobile multimedia broadcasting system) standard: broadcast channel frame structure, chnnel coding and modulation.
With reference to shown in Figure 1, be the frame structure schematic diagram in the GY/T220.1-2006 standard.The frame structure that is based on the time slot division that Fig. 1 represents.The physical layer signal per second is 1 frame, be divided into 40 time slots (TimeSlot, TS).The length of each time slot is 25ms, comprises 1 beacon (Beacon) and 53 OFDM (Orthogonal Frequency Division Multiplexing, OFDM) symbol.Each time slot has all adopted identical beacon length and OFDM symbol lengths.
With reference to shown in Figure 2, be the OFDM symbolic construction schematic diagram in the GY/T220.1-2006 standard.On time domain, each OFDM symbol is made of Cyclic Prefix (Cyclic Prefix is called for short CP) and OFDM data volume.OFDM data volume length (is used T
UExpression) be 409.6 μ s, circulating prefix-length (is used T
CPExpression) be 51.2 μ s.
Data volume length is relevant with OFDM subcarrier spacing (Δ f) in the OFDM symbol.As long as the sampling number of OFDM is certain, data volume length (T in the OFDM symbol
U) just determine.Its computational methods are:
T
U＝1/Δf；
With reference to shown in Figure 3, be the beacon infrastructure schematic diagram in the GY/T220.1-2006 standard.Beacon infrastructure comprise identification signal of transmitter (Transmitter Identifier, TxID) and two identical synchronizing signals (Synchronous signal, SYNC).Identification signal of transmitter length is 36 μ s, and the length of two synchronizing signals is respectively 204.8 μ s, so the length of beacon is 445.6 μ s.
The data transmission method for uplink of existing mobile multi-medium system is:
At the 0th to the 39th time slot, send the beacon of one 445.6 μ s successively respectively earlier by each time slot, sending 53 data body lengths again is 409.6 μ s, circulating prefix-length is the OFDM symbol of 51.2 μ s.
The modal network design of mobile multimedia broadcast system be single frequency network (Single FrequencyNetwork, SFN).The Single Frequency Network scheme has been set up the multipath propagation environment of oneself at receiving terminal, and the introducing of multi-transmitter has brought bigger time delay expansion.The cyclic prefix CP that the OFDM symbol adds suitable length is for the effectively antagonism ofdm system time delay expansion that the multipath transmission causes in the mobile multimedia Single Frequency Network; guarantee enough protections (GI) at interval; with the echo-signal of opposing, strengthen disposal ability to various echo-signals than long delay.Circulating prefix-length is generally greater than the propagation delay that transmits multipath signal.Transmission signals postpones to strengthen merging to the difference less than a Cyclic Prefix, and circulating prefix-length is big, and so treatable propagation delay is corresponding longer, and the programmable covering radius of network also strengthens.
Frame structure in the GY/T220.1-2006 standard exists protection at interval, will protect the computing of interval data when transmitter is realized, so more complicated during the transmitter realization.And for this protection being set at interval, and have to take certain time-domain resource.
In the GY/T220.1-2006 standard, circulating prefix-length is 51.2 μ s, is 1/8 length of OFDM symbol, and accessible in theory coverage distance approximately is 15 kilometers.The design defect of this Cyclic Prefix is that length is shorter, can not resist the echo-signal than long delay, makes this pattern be only applicable to small-sized single frequency network.Can not satisfy the requirement that covers in the needs, greatly in some environment of SFN network.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of data transmission method for uplink of mobile multi-medium system, the requirement that its individual transmitter coverage is enough to satisfy in the SFN network, covers on a large scale.
In order to solve the problems of the technologies described above, the invention provides a kind of data transmission method for uplink of mobile multi-medium system, in the described system, the every frame of physical layer signal is 1 second, is divided into a plurality of time slots, said method comprising the steps of:
(1) every frame is divided into 36 time slots;
(2) when the every frame data of emission, at the 0th time slot, send first beacon that length is 853 μ s earlier, send 53 OFDM symbols again;
(3) at the 1st to the 35th follow-up time slot, send second beacon that a length is 853.8 μ s respectively earlier by each time slot successively, send 53 OFDM symbols again;
Wherein, the step of described transmission OFDM symbol comprises: send the Cyclic Prefix that length is 98.4 μ s earlier, the data volume that to send a length again be 409.6 μ s.
Further, the step of described transmission first beacon comprises: send earlier the identification signal of transmitter that length is 33.8 μ s, the synchronizing signal that to send two length continuously again be 409.6 μ s; The step of described transmission second beacon comprises: send earlier the identification signal of transmitter that length is 34.6 μ s, the synchronizing signal that to send two length continuously again be 409.6 μ s.
Further, the step of the described transmission first beacon id signal comprises: send earlier the Cyclic Prefix that length is 8.2 μ s, the data volume that to send a length again be 25.6 μ s; The step of the described transmission second beacon id signal comprises: send earlier the Cyclic Prefix that length is 9 μ s, the data volume that to send a length again be 25.6 μ s.
Utilize the present invention can increase the coverage of single frequency network greatly, overcome the defective that existing GY/T220.1-2006 standard can not realize in the single frequency network, cover effectively on a large scale.In addition, the present invention has cancelled protection at interval, so transmitter realization time ratio is easier to.And cancelled this protection at interval, also make to the utilization of time-domain resource more abundant rationally.
Description of drawings
Fig. 1 is the frame structure schematic diagram in the GY/T220.1-2006 standard.
Fig. 2 is the OFDM symbolic construction schematic diagram in the GY/T220.1-2006 standard.
Fig. 3 is the beacon infrastructure schematic diagram in the GY/T220.1-2006 standard.
Fig. 4 is the data transmission method for uplink flow chart of mobile multi-medium system of the present invention.
Fig. 5 is the frame structure schematic diagram of 36 time slots of the present invention.
Fig. 6 is the first beacon infrastructure schematic diagram of the present invention.
Fig. 7 is the second beacon infrastructure schematic diagram of the present invention.
Fig. 8 is an OFDM symbolic construction schematic diagram of the present invention.
Embodiment
Main thought of the present invention is OFDM modulation system in not changing GY/T 220.1-2006 standard, do not change under the prerequisite of data subcarrier number, promptly under the situation that frequency domain information is not done to change substantially, and the data transmission method for uplink of a kind of needs that can satisfy in the single frequency network, cover on a large scale that provide.
Concerning mobile multimedia received, reception and efficiency of transmission were a pair of contradiction, need rationally accept or reject.Cyclic Prefix is selected more greatly, can resist the echo-signal than long delay, strengthens the disposal ability to various echo-signals, eliminates the various multipaths interference between data symbol under the single frequency network environment.Thereby can enlarge the individual transmitter covering radius, save the construction cost of Single Frequency Network.
Among the present invention, the assurance frequency domain information is not changed, and subcarrier spacing (Δ f) remains unchanged, and OFDM data volume length (is used T
UExpression) also can remain unchanged, still be 409.6 μ s.Under this principle, circulating prefix-length (is used T
CPExpression) expanded, and time-domain information is changed, so that structure of time slot is optimized and adjusts, and then on the basis of this new structure of time slot, designed new data transmission method for uplink.
In addition, the present invention has cancelled protection at interval.
Below in conjunction with accompanying drawing to a preferred embodiment of the present invention will be described in detail.
With reference to shown in Figure 4, be the data transmission method for uplink flow chart of mobile multi-medium system of the present invention.This method may further comprise the steps:
Step 401: every frame is divided into 36 time slots;
Step 402: when the every frame data of emission,, send first beacon that length is 853 μ s earlier, send 53 OFDM symbols again at the 0th time slot;
Step 403: the 1st to the 35th time slot follow-up, send second beacon that a length is 853.8 μ s respectively earlier by each time slot successively, send 53 OFDM symbols again.
Wherein, the step of described transmission OFDM symbol comprises: send the Cyclic Prefix that length is 98.4 μ s earlier, the data volume that to send a length again be 409.6 μ s.
The step of described transmission first beacon comprises: send earlier the identification signal of transmitter that length is 33.8 μ s, the synchronizing signal that to send two length continuously again be 409.6 μ s; The step of described transmission second beacon comprises: send earlier the identification signal of transmitter that length is 34.6 μ s, the synchronizing signal that to send two length continuously again be 409.6 μ s.
The step of the described transmission first beacon id signal comprises: send earlier the Cyclic Prefix that length is 8.2 μ s, the data volume that to send a length again be 25.6 μ s; The step of the described transmission second beacon id signal comprises: send earlier the Cyclic Prefix that length is 9 μ s, the data volume that to send a length again be 25.6 μ s.
With reference to shown in Figure 5, be the frame structure schematic diagram of 36 time slots of the present invention.Physical layer signal was 1 transmission channel frame in per 1 second, was divided into 36 time slots.The slot length of time slot 0 is 27777 μ s, and time slot 1-time slot 35 every slot lengths are 27777.8 μ s.Wherein first beacon length of time slot 0 is 853 μ s, and second beacon length of time slot 1-time slot 35 every time slots is 853.8 μ s.Beacon infrastructure comprises identification signal of transmitter (TxID) and two identical synchronizing signals.The identification signal of transmitter of first beacon comprises that Cyclic Prefix and length that a length is 8.2 μ s are the data volume of 25.6 μ s; The identification signal of transmitter of second beacon comprises that Cyclic Prefix and length that a length is 9 μ s are the data volume of 25.6 μ s.The OFDM symbol lengths of each time slot is 508 μ s, and wherein data volume length is 409.6 μ s, and circulating prefix-length is 98.4 μ s.
With reference to shown in Figure 6, be the first beacon infrastructure schematic diagram of the present invention.First beacon comprises that length is identification signal of transmitter and two synchronizing signals that length is 409.6 μ s of 33.8 μ s.
With reference to shown in Figure 7, be the second beacon infrastructure schematic diagram of the present invention.Second beacon comprises that length is identification signal of transmitter and two synchronizing signals that length is 409.6 μ s of 34.6 μ s.
With reference to shown in Figure 8, be OFDM symbolic construction schematic diagram of the present invention.The OFDM symbol is made of Cyclic Prefix and OFDM data volume, and OFDM data volume length is 409.6 μ s, and circulating prefix-length is 98.4 μ s.
Because this new data transmission method for uplink proposed by the invention, the length of Cyclic Prefix is expanded greatly in its broadcast channel frame, the interior too short problem of circulating prefix-length of broadcast channel frame in the data transmission method for uplink in the elimination GY/T 220.1-2006 standard, thereby can enlarge single transmitter covering radius, save the construction cost of Single Frequency Network, for the frequency planning and the overlay area planning of network agile lays the first stone.In addition, the present invention transmitter realization time ratio is easier to, and the utilization of time-domain resource is more abundant rationally by protecting cancellation at interval.
Certainly, above-mentioned specific embodiment is not the further qualification to technical solution of the present invention, and any those of ordinary skill in the art replaced or corresponding improvement the technology of the present invention feature being equal to of being done, still within protection scope of the present invention.
Claims (3)
1, a kind of data transmission method for uplink of mobile multi-medium system, in the described system, the every frame of physical layer signal is 1 second, is divided into a plurality of time slots, it is characterized in that, said method comprising the steps of:
(1) every frame is divided into 36 time slots;
(2) when the every frame data of emission, at the 0th time slot, send first beacon that length is 853 μ s earlier, send 53 OFDM symbols again;
(3) at the 1st to the 35th follow-up time slot, send second beacon that length is 853.8 μ s respectively earlier, send 53 OFDM symbols again;
Wherein, the step of described transmission OFDM symbol comprises: send the Cyclic Prefix that length is 98.4 μ s earlier, the data volume that to send a length again be 409.6 μ s.
2, the data transmission method for uplink of mobile multi-medium system as claimed in claim 1, it is characterized in that, the step of described transmission first beacon comprises: send earlier the identification signal of transmitter that length is 33.8 μ s, the synchronizing signal that to send two length continuously again be 409.6 μ s; The step of described transmission second beacon comprises: send earlier the identification signal of transmitter that length is 34.6 μ s, the synchronizing signal that to send two length continuously again be 409.6 μ s.
3, the data transmission method for uplink of mobile multi-medium system as claimed in claim 2, it is characterized in that, the step of the described transmission first beacon id signal comprises: send earlier the Cyclic Prefix that length is 8.2 μ s, the data volume that to send a length again be 25.6 μ s; The step of the described transmission second beacon id signal comprises: send earlier the Cyclic Prefix that length is 9 μ s, the data volume that to send a length again be 25.6 μ s.
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| CN 200710118259 CN101083663A (en) | 2007-07-03 | 2007-07-03 | Data transmission method of mobile multimedia system |
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| CN 200710118259 CN101083663A (en) | 2007-07-03 | 2007-07-03 | Data transmission method of mobile multimedia system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101977172A (en) * | 2010-10-18 | 2011-02-16 | 北京邮电大学 | Broadcast positioning signal generation method, positioning method and device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101977172A (en) * | 2010-10-18 | 2011-02-16 | 北京邮电大学 | Broadcast positioning signal generation method, positioning method and device |
| CN101977172B (en) * | 2010-10-18 | 2013-02-06 | 北京邮电大学 | Broadcast positioning signal generation method, positioning method and device |
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