CN102055556A - Mobile communication terminal base band processing system based on generic technique - Google Patents
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Abstract
The invention relates to the technical field of mobile communication, and in particular relates to a mobile communication terminal base band processing system based on a generic technique. The processing on part of base bands of a mobile communication system with different standards is realized by adopting a public scheduling module, and the system resources are saved. The mobile communication terminal base band processing system based on a generic technique comprises the public scheduling module which can be scheduled by the mobile communication system with different standards, and can provide functions commonly used in the mobile communication system with different standards. The mobile communication system with different standards comprises a GSM (global system for mobile) mobile communication system, a WCMDA (wideband code division multiple access) mobile communication system and an LTE (long term evolution) mobile communication system; and the public scheduling module comprises at least one of a CRC (cyclic redundancy check) functional module, a channel coding functional module, a modulation functional module and an interlaced functional module. In the invention, the flexibility of the base band link is improved greatly, and simultaneously the expenditure for realizing the base band link is reduced effectively in the mobile communication system with different standards.
Description
Technical field
The present invention relates to the mobile communication technology field, be specifically related to a kind of mobile communication system terminal band processing system.
Background technology
GSM(Global System for Mobile, global system for mobile communications) belongs to second generation mobile communication system, it is that the telecommunication department in Europe is to begin one's study under the background of poor compatibility in the common defects that overcomes first generation communication system, at that time at the TACS(Total in Europe Access Communications System, the total access communication system technology) and NMT(Nordic Mobile Telephony, NMT) incompatible, both sides' terminal can't insert bipartite network.Main communication equipment producer in Europe and operation department have carried out research and design according to the requirement of formulating pan-European mobile communication standard under the organization leadership of european telecommunication unified standard for this reason, its standardization is called GROUP SPECIAL MOBILE, thereby produced gsm system, be also referred to as Global System for Mobile Communication, China is commonly called as Global Link.This technical system adopts digital technology, and its operating frequency is generally 900MHz, can transmit data, and speech quality and confidentiality are better than the first generation.
Because there is poor compatibility in several big system of second generation communication system (2G), terminal can't free-roaming problem, the low rate of 9Kbps seems powerless on INTERNET access and transfer of data simultaneously, and this differs greatly from so-called " global personal communication " notion.For realizing " global personal communication " this imagination, people place hope on 3-G (Generation Three mobile communication system) (being called for short 3G) and bear this mission.
The WCDMA full name is Wideband Code Division Multiple Access, and Chinese translation is " Wideband Code Division Multiple Access (WCDMA) ", and it is one of 3G (Third Generation) Moblie three big standards.WCDMA originates from the wireless research activities of the early stage third generation of Europe and Japan, and the standardization in Europe produces significant impact to the immense success of GSM to third generation system.The research of RACE I(Europe ACT was carried out in Europe in 1988) program, and continue up in June, 1992, it has represented the beginning of the wireless research activities of the third generation.Europe has begun RACE II program between the 1992-1995.ACTS(ACT and business) build at the bottom of nineteen ninety-five, be the UMTS(universal mobile telecommunications system) set up the following WiMAX multiple access system of FRAMES() scheme.In these early stage researchs, various access technology is comprised that TDMA, CDMA, OFDM etc. test and assess.For WCDMA has established technical foundation.WCDMA supports the message transmission rate that 384Kbps does not wait to 2Mbps, at the state of high-speed mobile, can provide the transmission rate of 384Kbps, under low speed or indoor environment, then can provide the transmission rate up to 2Mbps.
Appearance along with broadband wireless access, mobile, broadband service access require also more and more higher, though WCDMA is supporting greater advantage is arranged, network configuration and air interface more complicated aspect mobility and the QoS, the wireless frequency spectrum utilance is not high, and propagation delay time is big.Meanwhile, be that the technology of new generation of core is ripe gradually with OFDM (OFDM, Ortogonal Frequency Division Multiplex) technology, access rate has risen to more than the 100Mbit/.By contrast, the WCDMA R99 transmission rate of 2Mbit/s, be difficult to satisfy the demands.For this reason, 3GPP is in the conscientious discussion of process in the end of the year 2004, and decision adopts the technology of B3G or 4G to use the 3G frequency range, so that occupy broadband wireless access market, and formulated Long Term Evolution (LTE, Long Term Evolution) plan.LTE can provide the peak rate of descending 100Mbps, up 50Mbps in the 20MHz spectral bandwidth; Improve the performance of Cell Edge User; Improve cell capacity; And support the sub-district of 100Km radius to cover; Can provide 350Km/h high-speed mobile user the access service of 100Kbps; Support paired or non-paired frequency spectrum, but and flexible configuration 1.25MHz to the 20MHz various bandwidth.
Based on above-mentioned situation, and from the angle of present networking and network topology, the networking of 3G all is superimposed upon on the 2G network, and 3G is basically only in the city networking of service distribution than comparatively dense.And the part countries and regions have realized that the network topology of LTE is superimposed upon on the 3G network.Therefore, the mobile multimode terminal based on the GSM/WCMDA/LTE multisystem will become the research and development emphasis in the research of following multi-module mobile terminal.Yet on existing multi-module mobile terminal Base-Band Processing, just respectively the Base-Band Processing of different system is independently realized, thereby make the realization repetition of the identical basic function module of different baseband systems in the portable terminal, serious waste the scheduling resource of system.
Summary of the invention
In view of this,, the invention discloses a kind of mobile communication terminal band processing system, adopt the part Base-Band Processing of public scheduler module realization, save system resource the different systems mobile communication based on common technology in order to address the above problem.
The object of the present invention is achieved like this: based on the mobile communication terminal band processing system of common technology, comprise the public calling module that can supply the different systems mobile communication system to call, described public calling module provides the different systems mobile communication system general function.
Further, described different systems mobile communication system comprises gsm mobile communication system, WCMDA mobile communication system and LTE mobile communication system, and described public calling module comprises at least one module in CRC functional module, chnnel coding functional module, modulation function module and the interleave function module.
Further, described CRC functional module is used in physical layer base band up link process, and up data code block is carried out CRC coding and additional; Comprise CRC omnibus algorithm storehouse in the described CRC functional module, store the corresponding multinomial that generates of each CRC length in each standard type mobile communication system in the described CRC omnibus algorithm storehouse, when the different systems mobile communication system is called the CRC functional module, in CRC omnibus algorithm storehouse, call corresponding multinomial and carry out CRC coding and additional.
Further, described chnnel coding functional module comprises an encoder for convolution codes and tap coefficient dispensing unit, encoder for convolution codes carries out the convolutional encoding and the Turbo coding of corresponding encoded rate according to the tap coefficient of encoding rate, shift register length and the dynamic-configuration of the configuration of different systems mobile communication system to the data code block.
Further, described interleave function module comprises the controller that interweaves, rank transformation pattern submodule and data matrix yardstick module, rank transformation pattern submodule provides the columns that interweaves of random interleaver, data matrix yardstick submodule provides interleaver matrix for the block interleaved device, the controller that interweaves calculates corresponding interleaving index according to interweave columns and interleaver matrix, the computing that interweaves of the corresponding interleaver of control.
Further, described modulation function module is supported BPSK modulation function submodule, QPSK modulation function submodule, 16QAM modulation function submodule and 64QAM modulation function submodule, calls corresponding modulation function submodule when mobile communication system is modulated and modulates.
Beneficial effect of the present invention is as follows: the mobile communication system that the present invention is directed to different systems, extract the general character function in each mobile communication system base band uplink processing process, the public calling module that foundation can supply the different systems mobile communication system to call, the independent multiple basic mode that realizes this functions of modules in each public module is to adapt to the requirement of different mobile systems.Adopt this mode, guaranteed in the different systems mobile communication system, the processing flexibility of base band link improves greatly, effectively reduces the expense that base band link is realized simultaneously.
Description of drawings
In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing:
Fig. 1 is a gsm system base band up link process schematic diagram;
Fig. 2 is a WCDMA system base band up link process schematic diagram;
Fig. 3 is a LTE system base band up link process schematic diagram;
Fig. 4 is the relational structure schematic diagram of GSM, WCDMA, LTE system and public scheduler module;
Fig. 5 is the structural representation of public scheduler module;
Fig. 6 is the structural representation of chnnel coding functional module;
Fig. 7 is the structural representation of interleave function module;
Fig. 8 is the structural representation of modulation function module.
Embodiment
Below will be described in detail the preferred embodiments of the present invention.
Studies show that the mobile communication system of different systems is because the difference of its design principle and application scenarios though can distinguish to some extent on the overall structure, still has some identical basic function module in band processing system.
In the present embodiment, with mobile communication terminal base band up link module is that example describes, though can be different on the base band up link modular structure, but from whole base band link structure angle analysis, can extract the general character part of the mobile communication system base band link processing procedure of different systems, set up the public scheduler module that realizes the public function of base band up link between the different systems mobile communication system, when certain concrete communication system base band link is realized, directly call public scheduler module, can reduce the realization expense on band chain road to greatest extent.
Fig. 1,2,3 has represented GSM, WCDMA, LTE system terminal base band up link process respectively, by comparative analysis, and considers the similitude of specific implementation between the module.Shown in Fig. 4,5, can set up be independent of each communication system comprise CRC functional module, chnnel coding functional module, modulation function module and the interleave function module public scheduler module of (wherein the interleave function module comprises rate-matched under Turbo coding and the general convolutional encoding and the channel interleaving piece of up channel), be used for confession GSM, WCDMA, the LTE mobile communication system is called.
In the physical layer base band up link process between the GSM/WCDMA/LTE mobile communication system, the data code block first step operation afterwards that receives the upper strata transmission is CRC(Cyclic Redundancy Check, cyclic redundancy check (CRC)) additional, it is to be used at receiving terminal the data code block of transmission being carried out error check.Wherein, the CRC length of WCDMA insertion can be: 24,16,12,8,0 bit.Circulation generator polynomial by the decision of CRC length produces the CRC check bit.Stipulated the generator polynomial of each CRC length correspondence among the standard TS25.212:
And the CRC length of inserting in the LTE system can be: 0,8,16,24 bits.And in standard TS36.212, stipulated the corresponding multinomial that generates of each CRC length:
The length that the generator polynomial here is made up of binary digit 1,0 is the code of L, L can be set up relation one to one with a multinomial that only contains 0 and 1 two coefficient uniquely.For example, the multinomial of code 1010111 correspondences
, D here
nThe n power of expression D.
Therefore, the corresponding multinomial that generates of each CRC length among GSM, WCDMA and the LTE is built up a public algorithms library, each multinomial is corresponding with a L value, for example, support 24 bit CRC check bits calculating and additional up the only requiring of LTE, stipulated among the standard TS36.212 that the generator polynomial of LTE ascending control channel CRC sign indicating number is:
At this moment, L is arranged to 24A, corresponding multinomial in the omnibus algorithm storehouse that can call establishment is realized the coding of the up CRC check bit of LTE and additional.
Adopt channel coding technology to improve anti-interference, the anti-fading ability of digital signal in the communication system, main convolution code, FIRE sign indicating number, three kinds of chnnel codings of parity check code used in gsm system, employing convolution speed are 1/2,1/3,1/6 convolution code; Main convolutional encoding, Turbo coding, the three kinds of channel coding methods of not encoding of adopting in the WCDMA system, wherein the encoding rate of convolutional encoding is 1/2 or 1/3, the encoding rate of Turbo coding is 1/3; Main tail-biting convolutional code and the Turbo coding of adopting in the LTE system, the encoding rate of wherein stinging the tail convolutional encoding is 1/3, the encoding rate of Turbo coding is 1/3.In gsm system, be that voice signal or signaling-information all will be through 1/2 speed convolutional encodings.And in WCDMA and LTE system, usually adopt different channel coding methods for different channels, but convolution coder that its main difference is the different coding rate and Turbo coding, and two component codings of Turbo encoder normally adopt convolution code, and the main difference of convolution code is embodied on different shift register length and the different tap coefficient (0 or 1).Therefore, as shown in Figure 6, convolutional encoding and Turbo coding for 1/2 encoding rate in the communication system of three kinds of different systems of GSM/WCDMA/LTE can realize that a public chnnel coding functional module realizes, described chnnel coding functional module is made up of encoder for convolution codes and tap coefficient dispensing unit, specific coding rate and the length of shift register and the dynamic-configuration of tap coefficient that can directly dispose according to the upper strata are carried out the convolutional encoding and the Turbo coding of corresponding encoded rate to the data code block.
As a kind of technology of tackling burst error, interweave and in the multiplexing and channel coding module of the communication system of different systems, used widely.Wherein, the degree of reusing of block interleaving technology is the highest.In gsm system, voice after the chnnel coding and signaling information all will enter interleave unit, interweave in the advanced row block of speech, carry out interweaving between the different language pieces again; And in the WCDMA system, clearly use to interweave for twice, the correlation of the front and back data sequence that interweaves is weakened, reduced the influence of data burst mistake, with further raising interference free performance.In the LTE system, as all adopting interleaving technology in the disparate modules such as channel interleaving module, OFDM module, therefore, can be by comparing the working method similarities and differences of the block interleaver of different submodules in the GSM/WCDMA/LTE different systems communication system, according to the general character that interweaves wherein, form a public interleave function module,, call the interleave function module to realize different interleave functions by different parameter configuration.
The module of application block interleaving technology mainly contains rate-matched, the rate-matched under the general convolutional encoding and the channel interleaving of up channel under the general turbo pattern in the chnnel coding process.By contrast to block interleaver in above three kinds of different systems communication system base band up link modules, can find it all is that bit stream is input in the matrix by row, displacement between being listed as according to certain rule then, read by row at last and form a bit stream, promptly its general character part in the arrangement of data, write and read on the mode.And difference only is the yardstick and the rank transformation pattern of data matrix.Fig. 7 has provided the interleave function modular structure of present embodiment, described interleave function module comprises the controller that interweaves, rank transformation pattern submodule and data matrix yardstick module, when the mobile communication system of different systems is called the interleave function module, because the mobile communication system of different systems adopts different interleavers, rank transformation pattern submodule provides the columns that interweaves of random interleaver, and data matrix yardstick submodule is M * N interleaver matrix for the block interleaved device provides a dimension.The controller that interweaves calculates corresponding interleaving index parameter according to interweave columns or interleaver matrix, the computing that interweaves of the corresponding interleaver of control.
In order to improve the digital baseband system transmission performance, realize the multiplexed of channel, improve the channel multiplexing rate, in the communication system of various standards, all adopted modulation technique.Mainly adopt OQPSK(Offset QPSK at gsm system, biasing QPSK) or GMSK(Gaussian Minimum Shift Keying, Guassian Minimum Shift Keying GMSK) modulation system; In 3G (Third Generation) Moblie, the modulation system of employing GMSK can't be avoided the signal zero crossing of many code channels transmission.Therefore, in the WCDMA system, up link adopts HPSK(Hybrid Phase Shift Keying, mixes phase-shift keying) modulation system.In the various channels of LTE system uplink, adopt BPSK, QPSK, 16QAM(Quadrature Amplitude Modulation, quadrature amplitude modulation) and the 64QAM modulation system.
In the existing communication system, support BPSK, QPSK, 16QAM, multiple basic modulation system such as 64QAM is to support modulation efficiency flexibly.In the communication system of different systems, the modulation system set of being supported is the subclass of above-mentioned various basic modulation systems.Therefore, different basic modulation systems independently can be realized, in the modulation module of different systems communication system, directly use these basic modulation systems to form the modulation system set that this system supports.Fig. 8 has provided the modulation function modular structure schematic diagram of present embodiment.The continuous bit symbol of input input in module, the parameter that variable R is a selecting modulation mode is set, as, when adopting BPSK, a single-bit maps to the complex value modulation symbol, when R=1 is set, call the BPSK modulation function submodule in the modulation function module, regulation R=2,4,6 o'clock, the QPSK modulation function submodule in the common modulation module is called in expression respectively, 16QAM modulation function submodule and 64QAM modulation function submodule, by the choosing value of the next Data Control N in upper strata, thereby select for use corresponding modulation function submodule to modulate, obtain the complex value modulation symbol.
The above only preferably is not limited to the present invention for of the present invention, and obviously, those skilled in the art can carry out various changes and modification and not break away from the spirit and scope of the present invention the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (6)
1. based on the mobile communication terminal band processing system of common technology, it is characterized in that: comprise the public calling module that can supply the different systems mobile communication system to call, described public calling module provides the different systems mobile communication system general function.
2. the mobile communication terminal band processing system based on common technology as claimed in claim 1, it is characterized in that: described different systems mobile communication system comprises gsm mobile communication system, WCMDA mobile communication system and LTE mobile communication system, and described public calling module comprises at least one module in CRC functional module, chnnel coding functional module, modulation function module and the interleave function module.
3. the mobile communication terminal band processing system based on common technology as claimed in claim 2 is characterized in that: described CRC functional module is used in physical layer base band up link process, and up data code block is carried out CRC coding and additional; Comprise CRC omnibus algorithm storehouse in the described CRC functional module, store the corresponding multinomial that generates of each CRC length in each standard type mobile communication system in the described CRC omnibus algorithm storehouse, when the different systems mobile communication system is called the CRC functional module, in CRC omnibus algorithm storehouse, call corresponding multinomial and carry out CRC coding and additional.
4. the mobile communication terminal band processing system based on common technology as claimed in claim 2, it is characterized in that: described chnnel coding functional module comprises an encoder for convolution codes and tap coefficient dispensing unit, encoder for convolution codes carries out the convolutional encoding and the Turbo coding of corresponding encoded rate according to the tap coefficient of encoding rate, shift register length and the dynamic-configuration of the configuration of different systems mobile communication system to the data code block.
5. the mobile communication terminal band processing system based on common technology as claimed in claim 2, it is characterized in that: described interleave function module comprises the controller that interweaves, rank transformation pattern submodule and data matrix yardstick module, rank transformation pattern submodule provides the columns that interweaves of random interleaver, data matrix yardstick submodule provides interleaver matrix for the block interleaved device, the controller that interweaves calculates corresponding interleaving index according to interweave columns and interleaver matrix, the computing that interweaves of the corresponding interleaver of control.
6. as the described mobile communication terminal band processing system of claim 2 based on common technology, it is characterized in that: described modulation function module is supported BPSK modulation function submodule, QPSK modulation function submodule, 16QAM modulation function submodule and 64QAM modulation function submodule, calls corresponding modulation function submodule when mobile communication system is modulated and modulates.
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Application publication date: 20110511 |