CN100550687C - A kind of wireless resource allocation methods of mobile multimedia broadcast system - Google Patents
A kind of wireless resource allocation methods of mobile multimedia broadcast system Download PDFInfo
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- CN100550687C CN100550687C CNB2006101523420A CN200610152342A CN100550687C CN 100550687 C CN100550687 C CN 100550687C CN B2006101523420 A CNB2006101523420 A CN B2006101523420A CN 200610152342 A CN200610152342 A CN 200610152342A CN 100550687 C CN100550687 C CN 100550687C
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Abstract
A kind of wireless resource allocation methods of mobile multimedia broadcast system, the quantity of the frequency division multiplexing symbol that every service of Mobile Multimedia Broadcasting is shared, determine by following steps: (1) calculates the data quantity C of every frame data after chnnel coding of every service according to the channel encoding rate of every service of Mobile Multimedia Broadcasting; (2), calculate the data volume R of every frame data after error correction coding of every service according to the error correction coding rate of data quantity C and every service; (3), calculate the quantity M that takies modulation symbol after the every frame data modulation of every service according to the channel modulation mode of data volume R and every service; (4) be defined as every service and need reserved radio resource quantity δ; (5) according to the quantity M, the reserved resource quantity δ that take modulation symbol, insert the symbol quantity that takies after the service data with other parameters of physical layer, calculate the frequency division multiplexing symbol quantity S that every service takies.
Description
Technical field
The present invention relates to the digital mobile communication field, relate in particular to a kind of wireless resource allocation methods of mobile multimedia broadcast system.
Background technology
In recent years, digital mobile multimedia broadcasting technology and standard evolution are rapid, for example (the digital video broadcast-handheld formula receives Ou Zhou DVB-H: Digital Video Broadcast Handheld), Media Forward Link Only) and the CMMB (China Mobile Multimedia Broadcast) etc. of China the MediaFLO of the U.S. (the single forward link of medium:, for its terminal use provides many service content, as advertisement, weather forecast, news, sports cast, variety, the multimedia broadcasting play, programs such as film, the user can select the service program of Mobile Multimedia Broadcasting according to the hobby of oneself.These Mobile Multimedia Broadcasting all are based on the frequency division multiplexing modulation technique, adopt the superframe mode to plan and managing radio resources, be with the concrete on-air radio resource of channel correlation multi-medium data mapping to be sent in the superframe time, and be sent in the air in the mode of electromagnetic signal, terminal receives mobile multi-media program according to system to the allocation of radio resources scheme of every service.If every service allocation of radio resources between each frame alters a great deal, be that receiving terminal different time in every frame receives the mobile multimedia service data, although this method can make wireless resource utility efficiency the highest, for example in the FLO technology, but it is bigger to the mobile multimedia broadcast receiving terminal influence, terminal is had relatively high expectations to system synchronization, and promptly the initial sampling time of terminal Digital Signal Processing in every frame need be very accurate, because every frame multi-medium data all changes; In addition, other factors that influence allocation of radio resources are more, as different modulator approaches, channel encoding rate etc., therefore need provide the influence of a kind of wireless resource allocation methods reduction of Mobile Multimedia Broadcasting to receiving terminal.
In addition, in mobile multimedia broadcast system, because Radio Resource is to be distributed unitedly by Mobile Multimedia Broadcasting operator, for example adopt auction service channel mode or distribute the operator of different regions, if so there is not resource allocation methods preferably, the Radio Resource that a service channel takies the follow-up service channel may take place so, cause loss of data, so resource allocation is very big to whole mobile multimedia broadcast system influence.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of Mobile Multimedia Broadcasting wireless resource allocation methods, reduces the influence of the variation of allocation of radio resources to mobile multimedia broadcast system.
For achieving the above object, the frequency division multiplexing symbol quantity Calculation method that the present invention at first provides a kind of Mobile Multimedia Broadcasting service to take is characterized in that, comprises the steps:
(1), calculates the data quantity C of every frame data after chnnel coding of every service according to the channel encoding rate of every service of Mobile Multimedia Broadcasting;
(2),, calculate the data volume R of every frame data after error correction coding of every service with the error correction coding rate of every service according to described data quantity C;
(3),, calculate the quantity M that takies modulation symbol after the every frame data modulation of every service with the channel modulation mode of every service according to described data volume R;
(4) be defined as every service and need reserved radio resource quantity δ;
(5) according to the quantity M, the reserved resource quantity δ that take modulation symbol, insert the symbol quantity that takies after the service data with other parameters of physical layer, calculate the frequency division multiplexing symbol quantity S that every service takies.
In the described step (1), during the data quantity C of the every frame data that calculate every service after chnnel coding, further the data wave momentum Δ of this service in interframe counted.
In the described step (2), during the data volume R of the every frame data that calculate every service after error correction coding, further the data wave momentum Δ of this service in interframe counted.
In the described step (3), calculate when taking the quantity M of modulation symbol after the every frame data modulation of every service, further the data wave momentum Δ of this service in interframe counted.
For realizing purpose of the present invention, the present invention also provides a kind of wireless resource allocation methods of mobile multimedia broadcast system, according to time division way, every service is that unit distributes with the symbol to Mobile Multimedia Broadcasting, after distributing a frequency division multiplexing symbol, the next symbol of reallocating, wherein, every quantity of serving shared frequency division multiplexing symbol, determine by following steps:
(1), calculates the data quantity C of every frame data after chnnel coding of every service according to the channel encoding rate of every service of Mobile Multimedia Broadcasting;
(2),, calculate the data volume R of every frame data after error correction coding of every service with the error correction coding rate of every service according to described data quantity C;
(3),, calculate the quantity M that takies modulation symbol after the every frame data modulation of every service with the channel modulation mode of every service according to described data volume R;
(4) be defined as every service and need reserved radio resource quantity δ;
(5) according to the quantity M, the reserved resource quantity δ that take modulation symbol, insert the symbol quantity that takies after the service data with other parameters of physical layer, calculate the frequency division multiplexing symbol quantity S that every service takies.
In the above-mentioned steps (1), during the data quantity C of the every frame data that calculate every service after chnnel coding, further the data wave momentum Δ of this service in interframe counted.
In the above-mentioned steps (2), during the data volume R of the every frame data that calculate every service after error correction coding, further the data wave momentum Δ of this service in interframe counted.
In the above-mentioned steps (3), calculate when taking the quantity M of modulation symbol after the every frame data modulation of every service, further the data wave momentum Δ of this service in interframe counted.
Mobile Multimedia Broadcasting wireless resource allocation methods provided by the invention has been considered the influencing factor of system to the multi-medium data amount, comprises channel encoding rate, error correction coding, modulator approach, physical layer parameter; While has considered that also the shake of interframe data amount causes the variation of Resources allocation, and then influence follow-up service resource distribution location in every frame, so need the reserved resource method, the Radio Resource that every Mobile Multimedia Broadcasting service is taken is constant, thereby has reduced the influence of Radio Resource variation to terminal.
Description of drawings
Fig. 1 is a kind of Mobile Multimedia Broadcasting Radio Resource frequency patterns based on frequency division multiplexing;
Fig. 2 is that a kind of mobile multi-media broadcasting data is in the transmitting terminal processing procedure;
Fig. 3 is a kind of Mobile Multimedia Broadcasting allocation of radio resources figure based on frequency division multiplexing.
Embodiment
In the allocation of radio resources of Mobile Multimedia Broadcasting, need to consider correlative factor, comprise following aspect:
At first, according to the channel encoding rate of every service of Mobile Multimedia Broadcasting, calculate the data volume of every frame data after chnnel coding of every service;
Secondly, if there is error correction coding to handle in the China mobile multi-media broadcasting technology,, calculate the data volume of every frame data after error correction coding of every service then according to the error correction coding rate of every service;
Based on the system design framework difference of different mobile multimedia broadcast systems, cause the order of chnnel coding and error correction coding different, but regardless of order, two kinds of coding methods all make every frame data of every service further increase.
The 3rd, Channel Modulation method according to every service of Mobile Multimedia Broadcasting, as BPSK (Binary Phase Shift Keying), QPSK (Quaternary Phase Shift Key), 16QAM methods such as (Quadrature Amplitude Modulation), calculate the quantity that takies modulation symbol after the every frame data modulation of every service;
The 4th, for the Radio Resource that every service takies is reserved, since data dithering between every service frame, i.e. the data difference of every service of each interframe, the Radio Resource difference that causes every frame data to take, if in every frame data, each serves the high efficiency Radio Resource that takies continuously, and the resource that will cause interframe to be distributed is widely different, terminal is received processing bring constant, so need the reserved part Radio Resource at every service, reduce every service and take resource location change frequency.
Below in conjunction with accompanying drawing the present invention is described in detail.
A kind of Mobile Multimedia Broadcasting Radio Resource frequency patterns shown in Figure 1 based on frequency division multiplexing.In every frame, comprise a plurality of frequency division multiplexing symbols on the time domain, frequency domain has 3000 subcarriers, numbering from 0 to 2999, so 3000 modulation symbols are arranged, carrying valid data, wherein the physical layer parameter pilot tone p regularity of distribution on each frequency division multiplexing symbol:
P=8n+1 (working as n%4=0);
P=8n+5 (working as n%4=1);
P=8n+3 (working as n%4=2);
P=8n+7 (working as n%4=3); N=0,1,2 ..., 374.
Be 375 modulation symbols that are used for pilot tone that distribute on each frequency division multiplexing symbol, the effective modulation symbol number that transmits multi-medium data is 2625.
If resource allocation according to time division way, is the unit distribution method with the symbol promptly, distribute a frequency division multiplexing symbol after, the next symbol of reallocating.
Mobile multi-media broadcasting data shown in Figure 2 is in the processing procedure of transmitting terminal, insert and the QPSK modulation through chnnel coding, error correction coding, pilot tone, other processing procedures (as interweaving encoding), in view of other processing procedures do not change the multi-medium data amount, do not influence allocation of radio resources, so do not describing here.
If a Mobile Multimedia Broadcasting is served every frame data the 144k bit is arranged, this service is a Δ at the data wave momentum of interframe, if the data channel encoding rate is 2/3, is C through data volume after the chnnel coding so:
C＝(144k+Δ)×3/2＝216k+1.5Δ
Pass through RS error correction coding RS (16,12,2) again, wherein 16 is RS numeral number, and 12 is RS numeral data numbers, and 2 is error correction rate, and promptly the RS encoding rate is 12/16=3/4
R＝C×4/3＝288k+2Δ
If adopt the QPSK modulator approach, promptly each modulation symbol mapping (enum) data amount is 2 bits, is M so take number of modulation symbols:
M＝R/2＝144k+Δ
Add the physical layer parameter pilot tone, calculate and take frequency division multiplexing symbol number S:
S＝M/(3000-375)＝54.9+δ
Wherein δ is the reserved resource number, prevents that the interframe data variation from causing the resource allocation change very greatly, to the allocation of radio resources influence of subsequent movement MBMS service, and then influences the terminal quality of reception.
A kind of Mobile Multimedia Broadcasting allocation of radio resources figure shown in Figure 3 based on frequency division multiplexing, take a plurality of frequency division multiplexing symbols continuously as i item service in every frame, and reserve a frequency division multiplexing symbol as standby resources, the service of i+1 item is given in back to back follow-up resource allocation, simultaneously also reserved a frequency division multiplexing symbol as standby resources, the rest may be inferred.
Considered the influencing factor of system in the foregoing description, comprised channel encoding rate, error correction coding, modulator approach, physical layer parameter the multi-medium data amount; While has considered that also the shake of interframe data amount causes the variation of Resources allocation, reserved the resource of some, thereby the Radio Resource that every Mobile Multimedia Broadcasting service is taken is constant, has reduced the influence of Radio Resource variation to terminal.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those skilled in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (2)
1, the frequency division multiplexing symbol quantity Calculation method that takies of Mobile Multimedia Broadcasting service is characterized in that, comprises the steps:
(1), calculates the data quantity C of every frame data after chnnel coding of every service according to the channel encoding rate of every service of Mobile Multimedia Broadcasting;
(2),, calculate the data volume R of every frame data after error correction coding of every service with the error correction coding rate of every service according to described data quantity C;
(3),, calculate the quantity M that takies modulation symbol after the every frame data modulation of every service with the channel modulation mode of every service according to described data volume R;
(4) be defined as every service and need reserved radio resource quantity δ;
(5) according to the quantity M, the reserved resource quantity δ that take modulation symbol, insert the symbol quantity that takies after the service data with other parameters of physical layer, calculate the frequency division multiplexing symbol quantity S that every service takies;
Wherein, the every frame data that calculate every service the data quantity C after the chnnel coding, every frame data after error correction coding data volume R and the modulation of every frame data after when taking the quantity M of modulation symbol, further the data wave momentum Δ of this service in interframe counted.
2, a kind of wireless resource allocation methods of mobile multimedia broadcast system, according to time division way, every service is that unit distributes with the symbol to Mobile Multimedia Broadcasting, after distributing a frequency division multiplexing symbol, the next symbol of reallocating, wherein, every quantity of serving shared frequency division multiplexing symbol, determine by following steps:
(1), calculates the data quantity C of every frame data after chnnel coding of every service according to the channel encoding rate of every service of Mobile Multimedia Broadcasting;
(2),, calculate the data volume R of every frame data after error correction coding of every service with the error correction coding rate of every service according to described data quantity C;
(3),, calculate the quantity M that takies modulation symbol after the every frame data modulation of every service with the channel modulation mode of every service according to described data volume R;
(4) be defined as every service and need reserved radio resource quantity δ;
(5) according to the quantity M, the reserved resource quantity δ that take modulation symbol, insert the symbol quantity that takies after the service data with other parameters of physical layer, calculate the frequency division multiplexing symbol quantity S that every service takies; The every frame data that calculate every service the data quantity C after the chnnel coding, every frame data after error correction coding data volume R and the modulation of every frame data after when taking the quantity M of modulation symbol, further the data wave momentum Δ of this service in interframe counted.
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