CN101346959A - Method and apparatus for using variable guard bands to achieve flexible bandwidth - Google Patents

Abstract

Techniques to flexibly support different bandwidths in a wireless communication system are described. The system supports configurable operating bandwidth using a fixed design bandwidth and a variable guard band. Values for various parameters, such as Fast Fourier Transform (FFT) size, cyclic prefix length, and sampling rate, may be selected based on the design bandwidth. The design bandwidth may be associated with a total of K subcarriers. Different operating bandwidths may be supported by selecting different numbers of available subcarriers. Regardless of the operating bandwidth selected, the transmitter and receiver may perform processing for the transmission using the same FFT size, cyclic prefix length, and sampling rate. The system may use different operating bandwidths and/or different parameter values (e.g., FFT sizes) for different portions of a transmission (e.g., the preamble and body of the transmission).

Description

Be used to use the variable guard band to realize the method and apparatus of flexible bandwidth

The application's case is advocated the 60/731st of being entitled as of application on October 27th, 2006 " being used to use the protection carrier wave to realize the method and apparatus (A METHOD AND APPARATUS FOR ACHEVING A FLEXIBLEBANDWIDTH USING GUARD CARRIERS) of flexible bandwidth "; the priority of No. 028 U.S. Provisional Application case; described provisional application case transfers this assignee, and is incorporated herein by reference.

Technical field

The present invention relates generally to communication, and more particularly, relates to the technology that is used for carrying out at wireless communication system transfer of data.

Background technology

Wireless communication system is widely used in provides each communication service, for example audio frequency, video, grouped data, message transmission, broadcasting etc.These systems can be the multi-address system that can support a plurality of user's communications by shared free system resources.The example of this type of multi-address system comprises code division multiple access (CDMA) system, time division multiple access (TDMA) system, frequency division multiple access (FDMA) system, quadrature FDMA (OFDMA) system and Single Carrier Frequency Division Multiple Access (SC-FDMA) system.

Wireless communication system is usually through designing to be used for specific bandwidth.Can for example select various system parameterss such as sampling rate, frame duration to realize desired performance based on system bandwidth.Described system is used in the different geographic regions that wherein can use different bandwidth.Then can select different group system parameter values to be used for different bandwidth.Yet, if possible use massive band width, parameter selects can be the task of difficulty.In addition, may have restriction to some parameter, this can make more difficult or become impossible to the selection of other parameter.

Therefore need to support neatly the technology of different bandwidth in this technology.

Summary of the invention

This paper is described in the technology of supporting different bandwidth in the wireless communication system.On the one hand, described system uses Fixed Design bandwidth and some variable guards to bring and supports configurable bandwidth of operation.For example the value of the various parameters of fast Fourier transform (FFT) size, circulating prefix-length and sampling rate can be selected based on design bandwidth.Described design bandwidth can be associated with K subcarrier altogether, wherein K＞1.Described bandwidth of operation can be associated with N available subcarrier, wherein K 〉=N＞1.Can easily support the different operating bandwidth by the available subcarrier of selecting different numbers.A remaining K-N subcarrier is the protection subcarrier that is not used in transmission.Transmitter can use identical FFT size, circulating prefix-length and sampling rate with receiver and not consider to select bandwidth of operation and carry out the processing that is used to transmit.

In another aspect, described system can use different operating bandwidth and/or different parameters value at the different piece of transmission.The first that first bandwidth of operation (or first group of subcarrier) can be used for transmitting.The second portion that second bandwidth of operation (or second group of subcarrier) can be used for transmitting.First can be corresponding to leading, and second portion can be corresponding to the transmission main body.First and second parts can be associated with identical or different design bandwidth.Each design bandwidth can be associated with the parameter value of particular group to be used for transmission.

Various aspects that hereinafter present invention will be further described and feature.

Description of drawings

Fig. 1 shows wireless communication system.

Fig. 2 shows the block diagram of base station and terminal.

Fig. 3 shows the OFDM modulator that is used for fixing bandwidth of operation.

Fig. 4 illustrates configurable bandwidth of operation and variable guard band.

Fig. 5 A shows the sub-carrier structure that is used for fixing design bandwidth.

Fig. 5 B shows the sub-carrier structure that is used for the configurable operations bandwidth.

Fig. 6 shows the OFDM modulator that is used for configurable bandwidth of operation.

Fig. 7 shows the ofdm demodulator that is used for configurable bandwidth of operation.

Fig. 8 and 9 shows respectively and is used for the process and the equipment that transmit with configurable bandwidth of operation.

Figure 10 shows superframe structure.

Figure 11 shows the different piece use different bandwidth for transmission.

Figure 12 and 13 shows respectively and is used for the process and the equipment that transmit with different bandwidth at different piece.

Embodiment

Fig. 1 shows thewireless communication system 100 with a plurality of base stations 110.The base station is generally the fixed station with terminal communication, and also can be called access point, Node B, enhancing Node B (eNode B) etc.Eachbase station 110 provides the communication coverage at the specific geographical area.According to context, term " sub-district " can refer to base station and/or its coverage.In order to improve power system capacity, base station range may be partitioned into a plurality of than the zonule, and for example, three than the zonule.Each can provide service by base station transceiver subsystem (BTS) separately than the zonule.According to context, term " sector " can refer to BTS and/or its coverage.For the sub-district of sectorization, the common co of the BTS of all sectors of described sub-district is in the base station of described sub-district.

Terminal 120 may be interspersed in the whole system.Terminal can be fixing or move and can be known as and access terminal, mobile radio station, subscriber equipment, mobile device, stand etc.Terminal can be cellular phone, PDA(Personal Digital Assistant), radio modem, radio communication device, handheld apparatus, subscriber unit etc.Terminal can be via down link and up link and one or more base station communications.Described down link (or forward link) refers to the communication link from the base station to the terminal, and described up link (or reverse link) refers to the communication link from terminal to base station.

System controller 130 can be coupled tobase station 110 and coordination and control to described base station are provided.System controller 130 can be the set of single network entity or networkentity.System controller 130 can comprise radio network controller (RNC), mobile switching centre (MSC) etc.

Technology described herein can be used for various communication systems: for example multi-address system (for example, CDMA, FDMA, TDMA, OFDMA and SC-FDMA system), broadcast system, wireless lan (wlan) etc.Term " system " and " network " are used interchangeably usually.OFDMA system and some broadcast system utilize Orthodoxy Frequency Division Multiplex (OFDM).The SC-FDMA system utilizes single carrier frequency division multiplexing (SC-FDM).OFDM and SC-FDM are divided into a plurality of (K) orthogonal sub-carriers with system bandwidth, and it is also referred to as tone, subband, bin etc. usually.Can each subcarrier of data-modulated.OFDM sends the modulation symbol in the frequency domain on subcarrier and SC-FDM sends the modulation symbol in the time domain on subcarrier.For clarity, hereinafter use description to the technology based on the system of OFDM, described system utilizes the system of OFDM.System based on OFDM can be OFDMA system, broadcast system, the utilize multiple radiotechnics system etc. of (for example, OFDM on the down link and the CDMA on the up link).

Fig. 2 shows the block diagram ofbase station 110 andterminal 120, and it is one of base station and one of terminal among Fig. 1.110 places in the base station, transmission (TX) data processor 210 receives different types of data, for example, from the business datum of data source (not shown) and the signaling of coming self-controller/processor 240.As using at this paper, " data " refer generally to any kind data, for example: business datum, signaling, overhead data, control data, pilot tone, broadcast data, message etc.Processor 210 is handled (for example, format, coding, alternation sum sign map) different types of data and modulation symbol is provided.OFDM modulator 220 is handled the modulation symbol of OFDM and is provided output sample or chip.Transmitter (TMTR) 222 is handled (for example, being transformed into simulation, amplification, filtering and frequency up-converted) described output sample and is produced down link signal, and it is transmitted via antenna 224.

Atterminal 120 places, antenna 252 receives frombase station 110 and may be from the down link signal of other base station, and provides the signal that is received to receiver (RCVR) 254.The signal that receiver 254 adjustings (for example, filtering, amplification, frequency down-converts and digitlization) are received also provides the sample that is received.Ofdm demodulator (Demod) 260 is handled and is used for the sample that is received of OFDM and the symbol that is received is provided.Receiving (RX) data processor 270 handles symbol that (for example, detection, symbol de-maps, release of an interleave and decoding) received and provides data through decoding forterminal 120.

On up link, atterminal 120 places, data are to be handled by TX data processor 290, by 292 modulation of OFDM modulator, by transmitter 294 adjustings and via antenna 252 transmission.110 places in the base station come the uplink signal ofself terminal 120 and other terminal to be received by antenna 224, by receiver 230 adjustings, by ofdm demodulator 232 demodulation, and by the data of RX data processor 234 processing to recover to send by terminal.In general, the processing that is used for ul transmissions can be similar to or be different from the processing that is used for downlink transmission.

Controller 240 and 280 is controlled at the operation atbase station 110 andterminal 120 places respectively.Memory 242 and 282 is stored data and the program code that is used forbase station 110 andterminal 120 respectively.

System based on OFDM is divided into K subcarrier altogether with the total bandwidth of W hertz usually.K is generally two power, so that can handle faster by using fast Fourier transform (FFT) and FFT inverse transformation (IFFT) operation.In each OFDM symbol period, can send K modulation symbol on K subcarrier altogether, on each subcarrier, send a modulation symbol.

Fig. 3 shows the block diagram ofOFDM modulator 220a, and describedOFDM modulator 220a can be used as the OFDM modulator 220 and 292 among Fig. 2.In the 220a, serial-to-parallel transducer 320 receives the modulation symbol of data (for example, business datum, signaling, pilot tone etc.) and described modulation symbol is mapped to K subcarrier altogether in the OFDM modulator.Modulation symbol through mapping is expressed as V (k), and wherein k is the index ofsubcarrier.IFFT unit 324 receives in each OFDM symbol period and is used for K modulation symbol of K subcarrier altogether, and IFFT is transformed into time domain with K modulation symbol by the K point, and provide contain K time domain samples through figure shift.Each time domain samples is the complex value of transmitting in a sample cycle.Parallel-to-serial transducer 326 is with each K sample serialization through figure shift.

Cyclic Prefix generator 328 repeats each part through figure shift (or C sample) contains K+C sample with formation OFDM symbol periodically/circularly.Described repeating part is called Cyclic Prefix or protection interval, and C is a circulating prefix-length.Cyclic Prefix is used to resist by frequency selective attenuation (its frequency response for changing on the whole system bandwidth) caused intersymbol interference (ISI).

330 pairs of OFDM symbols from Cyclic Prefix generator 328 of filter are carried out pulse shaping or are windowed.Filter 330 repeats periodically at L sample of each OFDM symbol front portion with at L the sample at each OFDM symbolrear portion.Filter 330 then according to want impulse response and to each OFDM symbol through extension carry out filtering with obtain the OFDM symbol through filtered samples.Described pulse shaping is guaranteed to meet the spectral emission mask of forcing in system through filteredsamples.Filter 330 is followed the OFDM symbol of overlapping described pulse shaping, so that last L filtered samples of each OFDM symbol is overlapped in the initial L of next OFDM symbol through filteredsamples.Filter 330 then to each sample cycle through the filtered samples summation and output sample is provided, it is expressed as y (n), wherein n is the index of sample cycle.Because overlapping and add operation mutually, so each OFDM symbol contains K+C+L sample after pulse shaping.The OFDM symbol period is the duration of an OFDM symbol and equals K+C+L sample cycle.

As shown in Figure 3, transmitter can send K modulation symbol in the frequency domain on K subcarrier altogether in each OFDM symbol period.Transmitter can be transformed into time domain to produce K time domain samples with K modulation symbol by IFFT.Also but additional length is that Cyclic Prefix and the length of C are the window of L.Then can convert the Serial No. of this K+C+L sample to analog waveform (DAC) by digital-to-analog converter.Described DAC can operate by sampling rate W, and the interval between the sample can be 1/W second.Receiver can obtain numeral sample by every 1/W sampling simulation second received signal.

The duration of OFDM symbol is expressed as T_OFDMAnd can be given:

T_OFDM=(K+C+L)/W equation (1)

Because the OFDM symbol is the BTU based on the system of OFDM, so the time interval in the system is usually with T_OFDMFor unit provides.For instance, packet can be encoded and be being crossed over N_FRAMESend in the frame of individual OFDM symbol.This transmission packets time should be N at least_FRAMET_OFDMSecond.Begin and the reception of the described packet so-called stand-by period in the time interval between finishing in the transmission of packet.Be easy to understand and directly depending on T based on the stand-by period in the system of OFDM_OFDM

Shown in equation (1), T_OFDMBe generally the function of bandwidth W.Therefore, the system based on OFDM at the different bandwidth design can have the different stand-by period.This may not be desired, because some application has the stand-by period requirement of the strictness of not depending on bandwidth.In order to ensure the similar stand-by period that is used for different bandwidth, for example some system parameters of FFT size, frame duration etc. can be defined as the function of bandwidth.Yet this parameter is selected to compare difficulty, if there is particularly difficulty of a large amount of possible allocated bandwidth.In addition, may have the restriction to FFT size, frame duration etc., it can make parameter select to become more difficult or impossible.

Sampling rate at the receiver place is generally equal to the integral multiple of bandwidth W.Different sampling rates can be used for different bandwidth.This may be disadvantageous, because may need to design hardware (for example, AD converter) to support different sampling rates.

On the one hand, support different bandwidth neatly by using Fixed Design bandwidth and variable guard band based on the system of OFDM.This permission system for the bandwidth supported to some extent use identical sampling rate and the similar stand-by period be provided.

Fig. 4 illustrates and uses variable guard to bring the support different bandwidth.Based on the system of OFDM through being designed for the fixed-bandwidth of W hertz.Described system brings the configurable bandwidth of operation of supporting the B hertz by using one or more protections of locating in the one or both ends of bandwidth of operation.Described bandwidth of operation B can be and is less than or equal to design bandwidth W (any bandwidth of B≤W).

Fig. 5 A shows the sub-carrier structure of design bandwidth W.Design bandwidth is divided into K subcarrier altogether, and described subcarrier can have been assignedindex 1 to K.Because design bandwidth is fixing, so the sum of subcarrier also is fixing.

Fig. 5 B shows the sub-carrier structure of bandwidth of operation B.Described bandwidth of operation can take whole design bandwidths or its part.Subcarrier in bandwidth of operation is called available subcarrier, and the subcarrier outside bandwidth of operation is called the protection subcarrier.Available subcarrier is the subcarrier that data available is modulated.The protection subcarrier is the only subcarrier modulated of signal values of zero of body so that on the protection subcarrier through-put power not.The number N of available subcarrier can be as shown in the formula providing:

N=KB/W equation (2)

The number G of protection subcarrier can provide by G=K-N.

Shown in Fig. 4 and Fig. 5 B, can support different bandwidth by using variable guard band/subcarrier up to the W hertz based on the system of OFDM.For instance, described system can be through design to be used for the 10MHz bandwidth.Can use described system with the 8MHz bandwidth of operation by on each side of the both sides of 8MHz bandwidth of operation, using the 1MHz boundary belt.In general, can select left and right sides boundary belt based on bandwidth of operation B and design bandwidth W.Left and right sides boundary belt can have equal or can not have equal lengths.

By using variable guard band/subcarrier, can support different bandwidth by single sampling rate based on the system of OFDM, and tenaculum is wide to some extent that the similar stand-by period is provided for institute.The sampling rate of 1/W can be used for described system, and can shown in equation (1), provide the OFDM symbol duration.Amount and bandwidth of operation B on the right side of equation (1) are irrelevant.Therefore, OFDM symbol period T_OFDMIrrelevant with stand-by period and bandwidth of operation B.

Fig. 6 shows the block diagram of the design of theOFDM modulator 220b that is used for configurable bandwidth ofoperation.OFDM modulator 220b also can be used as the OFDM modulator 220 and 292 among Fig. 2.InOFDM modulator 220b, serial-to-parallel transducer 620 receives data () modulation symbol for example, business datum, signaling, pilot tone etc., and described modulation symbol is mapped to N available subcarrier.Modulation symbol through mapping is expressed as U (k).Zero insertion unit 622 is inserted in nil symbol on each protection subcarrier and K transmission symbol is provided in each OFDM symbol period.Nil symbol is the signal value for zero.Each transmission symbol can be modulation symbols for data or nil symbol.Described transmission symbol is expressed as V (k).Can based on bandwidth of operation B carry out byunit 620 carry out to the mapping of N available subcarrier and the zero insertion of being undertaken byunit 622.

IFFT unit 624 receives in each OFDM symbol period and is used for K transmission symbol of K subcarrier altogether, and IFFT transforms to time domain with K transmission symbol by the K point, and K time domain samples is provided.Each through K sample of figure shift by parallel-to-serial transducer 626 serializations, byCyclic Prefix generator 628 pended cyclic prefix, and bypulse shaping filter 630 filtering to produce pulse shaping OFDM symbol.

Fig. 7 shows the block diagram of the design of the ofdm demodulator 260a that is used for configurable bandwidth of operation.Ofdm demodulator 260a can be used for the ofdm demodulator 260 and 232 among Fig. 2.In ofdm demodulator 260a, cp removal unit 710 is obtained K+C+L the sample that receives in each OFDM symbol period, remove C the sample that is used for Cyclic Prefix and be used for L sample of pulse shaping window, and provide K to be received sample by the OFDM symbol period.Serial-to-parallel transducer 712 provides K the sample that received with parallel form.FFT unit 714 transforms to K frequency domain and provides K institute's receiving symbol for K subcarrier altogether through receiving sample by K point FFT.Institute's receiving symbol from FFT unit 714 is expressed as Y (k).

Zero removes unit 716 obtains K institute's receiving symbol in each OFDM symbol period, remove institute's receiving symbol from G protection subcarrier, and provide N symbol that is received from N available subcarrier.Institute's receiving symbol from unit 716 is expressed as R (k).Parallel-to-serial transducer 728 will be from N institute's receiving symbol serialization of each OFDM symbol of unit 716.The parallel-to-serial conversion that can carry out that the nil symbol of being undertaken by unit 716 remove and be undertaken by unit 718 based on bandwidth of operation B.

System based on OFDM can have single design bandwidth W and can use for example particular value of the parameter of FFT size K, circulating prefix-length C, window length L and sampling rate W.Can use these preset parameter values of K, C, L and sampling rate to support different operating bandwidth up to W.

System based on OFDM also can have an above design bandwidth, and can use one group of particular value of K, C, L and sampling rate at each design bandwidth.Parameter value can be through not selecting to be used for the different designs bandwidth on the same group, for example, and to realize the same or analogous stand-by period at all design bandwidths.For instance, the system based on OFDM can be through design to be used for 512 and 1024 FFT size the bandwidth of 5MHz and 10MHz respectively.Described 5MHz design bandwidth can be used for supporting (the bandwidth of operation of B≤5MHz) up to 5MHz.The design bandwidth of 10MHz can be used for supporting the bandwidth of operation (5MHz＜B≤10MHz) from 5 to 10MHz.In general, can support the design bandwidth of any number, and arbitrary group of parameter value can be used for each design bandwidth.Each design bandwidth can be supported the bandwidth of operation scope that is associated up to described design bandwidth.

As mentioned above, the variable guard band can be used for supporting the different operating bandwidth.The variable guard band also can be used for supporting the different spectral emissions mask.The output power levels that the spectral emission mask specifies under the different frequency to be allowed.More the strict spectral emissions mask may require output power levels to decay manyly under some frequency.The impulse response of pulse shaping filter is generally fixing, to simplify the transmitter design.Can use more protection subcarriers so that satisfy more strict spectral emissions mask requirement.

The variable guard band also can be used for avoiding the interference from other transmitter.For instance, in the high interference levels that can observe based on the base station in the system of OFDM from other transmitter in other system.Its bandwidth of operation can be adjusted so that avoid using the subcarrier with high interference levels in described base station.Described subcarrier can be become the protection subcarrier and be not used in transmission.

Fig. 8 shows the process of transmitting by configurable bandwidth of operation 800.Process 800 can be carried out by transmitter (base station that for example, is used for downlink transmission) or receiver (terminal that for example, is used for downlink transmission).Determine available subcarrier and protection subcarrier (square frame 812) based on the configurable bandwidth of operation that is used for wireless communication system.Can wait the selection operation bandwidth based on the available bandwidth of (for example) system, the spectral emission mask of system.Definite can the grade based on signaling, control register, firmware hardwired logic, software command in thesquare frame 812 carried out.Described system can be associated corresponding to the design bandwidth of K subcarrier altogether.Bandwidth of operation can be corresponding to N available subcarrier, wherein K 〉=N＞1.N available subcarrier can be placed in the middle in K subcarrier altogether, and the protection subcarrier can be evenly distributed on the both sides of bandwidth of operation.Other layout available and the protection subcarrier also is possible.Execution is used for the processing (square frame 814) of the transmission that sends on described available subcarrier.Described transmission can comprise business datum, signaling, pilot tone etc.

Process 800 can be carried out by transmitter.In the case, forsquare frame 814, modulation symbol can be mapped to available subcarrier, and nil symbol can be mapped to the protection subcarrier.Can be based on the modulation symbol that is shone upon and nil symbol and produce the OFDM symbol.Can be further based on producing the OFDM symbol with the irrelevant FFT size of bandwidth of operation and circulating prefix-length.Can be by producing output sample with the sampling rate that bandwidth of operation has nothing to do.

Process 800 also can be carried out by receiver.In the case, forsquare frame 814, can by can with the irrelevant sampling rate of bandwidth of operation obtain the sample that receives and handled (for example, OFDM demodulation) in addition, to obtain at institute's receiving symbol of K subcarrier altogether.Institute's receiving symbol can be kept, and institute's receiving symbol of self-shield subcarrier can be given up to come from available subcarrier.Institute's receiving symbol from available subcarrier can treated (for example, symbol de-maps, release of an interleave and decoding) data to recover to send in transmission.

Bandwidth of operation can from a plurality of bandwidth that the protection subcarrier and the fixed OFDM symbol duration of different numbers are associated select.The number of can be by keeping identical OFDM symbol duration but changing the protection subcarrier produces the OFDM symbol that is used for the different operating bandwidth.

Described system can be associated with single design bandwidth.Bandwidth of operation can be selected from the bandwidth range that design bandwidth is supported.Can carry out the processing ofsquare frame 814 based on one group of parameter value that is used for design bandwidth.Perhaps, system can be associated with a plurality of design bandwidths.Each design bandwidth can be supported bandwidth of operation scope separately.Can carry out the processing ofsquare frame 814 based on one group of parameter value of the design bandwidth of the bandwidth of operation that is used for supporting selecting for use.

Fig. 9 shows the design be used for theequipment 900 that transmits with configurable bandwidth ofoperation.Equipment 900 comprises: be used for determining the device (for example module 912) of available subcarrier and protection subcarrier and be used to carry out device (for example module 914) at the processing of the transmission that sends on available subcarrier based on the configurable bandwidth of operation of wirelesscommunication system.Module 912 and 914 can comprise processor, electronic installation, hardware unit, electronic building brick, logical circuit, memory etc. or its any combination.

In another aspect, the system based on OFDM can use different operating bandwidth and/or different parameters value at the different piece of transmission.Described system can utilize the main body that comprises the leading of one or more OFDM symbols and comprise the OFDM symbol of arbitrary number.But the information of demodulation sign indicating number is carried out in the transmission that described leading carrying is used for that main body is sent.But the data of described main body carrying business datum and/or other type.Can be used for leading different operating bandwidth and/or parameter value and main body.

Figure 10 shows thesuperframe structure 1000 that can be used for based on the system of OFDM.The timeline that is used in the system transmit can be divided into a plurality of superframes.Each superframe can have predetermined lasting time.Superframe also can be called frame, time slot or some other term.In design shown in Figure 10, each superframe comprises leading 1010 and main body 1020.Leading 1010 comprisepilot field 1012 andoverhead field 1014.

Butpilot field 1012 carrying pilot tones and/or be used for that for example system's detection, time and frequency are obtained, other signal of each purpose of passage estimation etc.But 1014 carryings of overhead field send the information, system information of data etc. about how in main body 1020.For instance, but 1014 carryings of overhead field are used for the information of the parameter of for example bandwidth of operation, FFT size, circulating prefix-length, window length, frequency hop sequences ofmain body 1020 etc.Butmain body 1020 carry data, for example, business datum, signaling, pilot tone etc.Threefields 1012,1014 and 1020 can be through time division multiplexing in each superframe as shown in figure 10, so that promote synchronously and the data recovery.In each superframe,pilot field 1012 can be sent at first and it can be used for detecting overhead field 1014.The information that is obtained fromoverhead field 1014 can be used for recovering the data of transmissionmain body 1020.

Figure 11 shows the design that has thestructure 1100 of different designs bandwidth and different operating bandwidth atdifferent field.In structure 1100, a design bandwidth W_PWith a FFT size K_PCan be used for leading.Another design bandwidth W_MWith another FFT size K_MCan be used for main body.Can be based on being used for leading design bandwidth W_PK altogether_PIndividual subcarrier selects to be used for leading bandwidth of operation B_PAnd N_PIndividual available subcarrier.Can be based on the design bandwidth W that is used for main body_MK altogether_MIndividual subcarrier, selection is used for the bandwidth of operation B of main body_MAnd N_MIndividual available subcarrier.Described parameter can (for example) following selection:

W_P≤ W_M, B_P≤ B_MAnd K_P≤ K_MEquation (3)

Different design bandwidths, bandwidth of operation, FFT size etc. also can be used for leading pilot tone and overhead field.

Perhaps, a design bandwidth W and a FFT size K can be used for all fields, and the different operating bandwidth can be used for different field.Bandwidth of operation B_PilotCan be used for pilot field, bandwidth of operation B_OverheadCan be used for the overhead field, and bandwidth of operation B_MainCan be used for main body.The bandwidth that is used for each field can (for example) following selection:

B_pilot≤B_overhead≤B_main≤W。Equation (4)

Can each mode pass on the bandwidth that is used for different field.In a kind of design, the design bandwidth of pilot field, overhead field and main body and bandwidth of operation be fix and know in advance for terminal.

In another design, the design bandwidth of pilot field, overhead field and main body is fixed, and the bandwidth of operation of pilot field, overhead field and/or main body is configurable.Can in another field, send the parameter value of each configurable field.For instance, can in pilot field, transmit the bandwidth of operation and the parameter value of overhead field.Can in the overhead field, pass on the bandwidth of operation and the parameter value of main body.Terminal can be known in advance or recovers the overhead field via the parameter value that pilot field is passed on based on terminal.The transmission that terminal then can be recovered to send main body based on the parameter value that obtains from the overhead field.

In another design, predetermined group of parameter value of minority can be used to provide field, for example, pilot field, overhead field or main body.Terminal is understood the predefined parameter group, and can attempt recovering transmission on this field based on described predefined parameter group.

The combination of above-mentioned design also can be used for different field.For instance, one group of known parameters value can be used for pilot field, and predetermined group of parameter value of minority can be used for the overhead field, and configurable parameter value group can be used for main body and passes in the overhead field.Terminal can be recovered described pilot tone based on described group of known parameter value.Terminal can be recovered overhead and obtain configurable parameter value group for main body based on predetermined group parameter value.The transmission that terminal then can be recovered to send in main body based on configurable parameter value group.

Figure 12 shows the design of theprocess 1200 that can be carried out by transmitter or receiver.Use first bandwidth of operation to carry out the processing (square frame 1212) of the first that is used for described transmission.Use second bandwidth of operation to carry out the processing (square frame 1214) of the second portion that is used to transmit.First can be corresponding to leading, and second portion can be corresponding to the main body of described transmission.

Process 1200 can be carried out by transmitter.In the case, can on the first that is used for described transmission and first group of subcarrier determining based on described first bandwidth of operation, send signaling.Can on the second portion that is used for described transmission and second group of subcarrier determining based on second bandwidth of operation, send data.Described signaling can comprise the information of the parameter of the second portion that is used to transmit.Described parameter can comprise second bandwidth of operation, FFT size, circulating prefix-length, frequency hop sequences etc.

Process 1200 also can be carried out by receiver.In the case, can receive signaling, and can receive data from second group of subcarrier from first group of subcarrier.But processing signaling is with the information of the parameter of the second portion that obtains to be used to transmit.Can handle the second portion of described transmission based on the information that obtains from described signaling.

In a kind of design, first and second bandwidth of operation are to be selected from one group of available bandwidth of operation of first and second parts.In another design, described first bandwidth of operation is to be selected from first group of bandwidth of operation that first can use.Described second bandwidth of operation is to be selected from second group of bandwidth of operation that second portion can be used.

In a kind of design, first and second parts are associated with a design bandwidth.Processing to first and second parts can be based on the one group of parameter value that is used for this design bandwidth.In another design, first and second parts are associated with first and second design bandwidths respectively.Processing to first can be based on the first group of parameter value that is used for described first design bandwidth.Processing to second portion can be based on the second group of parameter value that is used for described second design bandwidth.First group of design bandwidth is applicable to described first, and second group of design bandwidth is applicable to described second portion.Described first and described second design bandwidth can be respectively from first group and second group selection.

Compare with second portion, first can be associated with less design bandwidth and/or less bandwidth of operation.This can reduce the number of the hypothesis that will assess for the transmission that recovers to send in first.

Figure 13 shows the design of theequipment 1300 that is used totransmit.Equipment 1300 comprises: the device (for example module 1312) and being used to that is used to carry out the processing of the first that use first bandwidth of operation at transmission sends is carried out the device (for example module 1314) of the processing of the second portion that use second bandwidth of operation at describedtransmission sends.Module 1312 and 1314 can comprise processor, electronic installation, hardware unit, electronic building brick, logical circuit, memory etc. or its any combination.

Transmission technology described herein can be implemented by various devices.For instance, described technology may be implemented in hardware, firmware, software or its combination.For the hardware embodiment, at the processing unit at entity place (for example, base station or terminal) may be implemented in one or more application-specific integrated circuit (ASIC)s (ASIC), digital signal processor (DSP), digital signal processing device (DSPD), programmable logic device (PLD), field programmable gate array (FPGA), processor, controller, microcontroller, microprocessor, electronic installation, through design carrying out other electronic unit of function described herein, or its combination.

For firmware and/or software implementation scheme, described technology can be implemented by the module (for example, program, function etc.) of carrying out function described herein.Firmware and/or software code can be stored in the memory (for example, the memory 242 or 282 of Fig. 2) and by processor (for example, processor 240 or 280) and carry out.Described memory may be implemented in the processor or processor outside.

The those skilled in the art provides previous description of the present invention so that can make or use the present invention.Be appreciated by those skilled in the art that various modifications of the present invention, and General Principle defined herein can be applicable to other variant under the situation that does not depart from spirit of the present invention or category.Therefore, do not expect that the present invention is subject to example as herein described, but make it consistent with the category the most widely that meets principle disclosed herein and novel feature.

Claims (43)

Translated fromChinese

1.一种设备，其包含：1. A device comprising:处理器，其经配置以基于用于无线通信系统的可配置操作带宽确定可用子载波和保护子载波，并执行针对在所述可用子载波上发送的传输的处理；以及a processor configured to determine available subcarriers and guard subcarriers based on a configurable operating bandwidth for the wireless communication system, and perform processing for transmissions sent on the available subcarriers; and存储器，其耦合到所述处理器。memory coupled to the processor.2.根据权利要求1所述的设备，其中所述处理器经配置以将调制符号映射到所述可用子载波，将零符号映射到所述保护子载波，并基于所述映射的调制符号和零符号产生正交频分多路复用(OFDM)符号。2. The apparatus of claim 1 , wherein the processor is configured to map modulation symbols to the available subcarriers, map zero symbols to the guard subcarriers, and map modulation symbols to the guard subcarriers based on the mapped modulation symbols and The null symbol produces an Orthogonal Frequency Division Multiplexing (OFDM) symbol.3.根据权利要求2所述的设备，其中所述处理器经配置以基于与所述操作带宽无关的快速傅立叶变换(FFT)大小和循环前缀长度产生所述OFDM符号。3. The apparatus of claim 2, wherein the processor is configured to generate the OFDM symbols based on a Fast Fourier Transform (FFT) size and a cyclic prefix length independent of the operating bandwidth.4.根据权利要求1所述的设备，其中所述处理器经配置而以与所述操作带宽无关的取样速率产生输出样本。4. The apparatus of claim 1, wherein the processor is configured to generate output samples at a sampling rate independent of the operating bandwidth.5.根据权利要求1所述的设备，其中所述处理器经配置以获得来自所述可用子载波的所接收符号，舍弃来自所述保护子载波的所接收符号，并处理来自所述可用子载波的所述接收的符号以恢复在所述传输中发送的数据。5. The apparatus of claim 1, wherein the processor is configured to obtain received symbols from the available subcarriers, discard received symbols from the guard subcarriers, and process symbols from the available subcarriers. The received symbols of the carrier to recover the data sent in the transmission.6.根据权利要求5所述的设备，其中所述处理器经配置而以与所述操作带宽无关的取样速率获得所接收的样本，并处理所述接收的样本以获得所述可用和保护子载波的所述接收的符号。6. The apparatus of claim 5, wherein the processor is configured to obtain the received samples at a sampling rate independent of the operating bandwidth, and to process the received samples to obtain the available and guarded samples The received symbols of the carrier.7.根据权利要求1所述的设备，其中所述无线通信系统与对应于总共K个子载波的设计带宽相关联，且其中所述操作带宽对应于N个可用子载波，其中K≥N＞1。7. The apparatus of claim 1, wherein the wireless communication system is associated with a design bandwidth corresponding to a total of K subcarriers, and wherein the operating bandwidth corresponds to N available subcarriers, where K≥N>1 .8.根据权利要求7所述的设备，其中所述N个可用子载波在所述总共K个子载波中居中。8. The apparatus of claim 7, wherein the N available subcarriers are centered among the total K subcarriers.9.根据权利要求1所述的设备，其中所述保护子载波均匀分布在所述操作带宽的两侧上。9. The apparatus of claim 1, wherein the guard subcarriers are evenly distributed on both sides of the operating bandwidth.10.根据权利要求1所述的设备，其中所述无线通信系统与单一设计带宽相关联，且所述操作带宽是选自由所述设计带宽支持的带宽范围，且其中所述处理器经配置以基于用于所述设计带宽的一组参数值执行针对所述传输的处理。10. The apparatus of claim 1, wherein the wireless communication system is associated with a single design bandwidth, and the operating bandwidth is selected from a bandwidth range supported by the design bandwidth, and wherein the processor is configured to Processing for the transmission is performed based on a set of parameter values for the designed bandwidth.11.根据权利要求1所述的设备，其中所述无线通信系统与多个设计带宽相关联，每一设计带宽支持各自的带宽范围，且其中所述处理器经配置以基于用于支持所述操作带宽的设计带宽的一组参数值执行针对所述传输的处理。11. The apparatus of claim 1, wherein the wireless communication system is associated with a plurality of design bandwidths, each design bandwidth supporting a respective bandwidth range, and wherein the processor is configured to support the A set of parameter values for a design bandwidth of an operating bandwidth performs processing for the transmission.12.根据权利要求1所述的设备，其中所述无线通信系统与第一和第二设计带宽相关联，且其中所述处理器经配置以：如果所述操作带宽在第一范围内，则基于用于所述第一设计带宽的第一组参数值执行针对所述传输的处理；如果所述操作带宽在低于所述第一范围的第二范围内，则基于用于所述第二设计带宽的第二组参数值执行针对所述传输的处理。12. The apparatus of claim 1, wherein the wireless communication system is associated with first and second design bandwidths, and wherein the processor is configured to: if the operating bandwidth is within a first range, then Processing for the transmission is performed based on a first set of parameter values for the first design bandwidth; if the operating bandwidth is within a second range lower than the first range, then based on values for the second A second set of parameter values for bandwidth is designed to perform processing for the transmission.13.根据权利要求1所述的设备，其中所述操作带宽是基于所述无线通信系统可用的频率带宽而确定的。13. The apparatus of claim 1, wherein the operating bandwidth is determined based on frequency bandwidth available to the wireless communication system.14.根据权利要求1所述的设备，其中所述操作带宽是基于用于所述无线通信系统的频谱发射掩模而确定的。14. The apparatus of claim 1, wherein the operating bandwidth is determined based on a spectral emission mask for the wireless communication system.15.根据权利要求1所述的设备，其中所述操作带宽是选自与不同数目的保护子载波和固定正交频分多路复用(OFDM)符号持续时间相关联的多个带宽。15. The apparatus of claim 1, wherein the operating bandwidth is selected from a plurality of bandwidths associated with different numbers of guard subcarriers and fixed Orthogonal Frequency Division Multiplexing (OFDM) symbol durations.16.一种方法，其包含：16. A method comprising:基于用于无线通信系统的可配置操作带宽确定可用的子载波和保护子载波；以及determining available subcarriers and guard subcarriers based on a configurable operating bandwidth for the wireless communication system; and执行针对在所述可用子载波上发送的传输的处理。Processing is performed for transmissions sent on the available subcarriers.17.根据权利要求16所述的方法，其中所述执行针对所述传输的处理包含：17. The method of claim 16, wherein said performing processing for said transmission comprises:将调制符号映射到所述可用子载波，mapping modulation symbols to said available subcarriers,将零符号映射到所述保护子载波，以及mapping zero symbols to the guard subcarriers, and基于所述映射的调制符号和零符号产生正交频分多路复用(OFDM)符号。Orthogonal frequency division multiplexing (OFDM) symbols are generated based on the mapped modulation symbols and null symbols.18.根据权利要求16所述的方法，其中所述执行针对所述传输的处理包含：18. The method of claim 16, wherein said performing processing for said transmission comprises:获得来自所述可用子载波的所接收符号，obtaining received symbols from said available subcarriers,舍弃来自所述保护子载波的所接收符号，以及discarding received symbols from the guard subcarriers, and处理来自所述可用子载波的所述接收的符号以恢复在所述传输中发送的数据。The received symbols from the available subcarriers are processed to recover data sent in the transmission.19.一种设备，其包含：19. A device comprising:用于基于用于无线通信系统的可配置操作带宽确定可用子载波和保护子载波的装置；以及means for determining available subcarriers and guard subcarriers based on a configurable operating bandwidth for a wireless communication system; and用于执行针对在所述可用子载波上发送的传输的处理的装置。means for performing processing for transmissions sent on the available subcarriers.20.根据权利要求19所述的设备，其中所述用于执行针对所述传输的处理的装置包含：20. The apparatus of claim 19, wherein the means for performing processing for the transmission comprises:用于将调制符号映射到所述可用子载波的装置，means for mapping modulation symbols to said available subcarriers,用于将零符号映射到所述保护子载波的装置，以及means for mapping zero symbols to said guard subcarriers, and用于基于所述映射的调制符号和零符号产生正交频分多路复用(OFDM)符号的装置。Means for generating an Orthogonal Frequency Division Multiplexing (OFDM) symbol based on the mapped modulation symbol and a null symbol.21.根据权利要求19所述的设备，其中所述用于执行针对所述传输的处理的装置包含：21. The apparatus of claim 19, wherein the means for performing processing for the transmission comprises:用于获得来自所述可用子载波的所接收符号的装置，means for obtaining received symbols from said available subcarriers,用于舍弃来自所述保护子载波的所接收符号的装置，以及means for discarding received symbols from the guard subcarriers, and用于处理来自所述可用子载波的所述接收的符号以恢复在所述传输中发送的数据的装置。means for processing said received symbols from said available subcarriers to recover data sent in said transmission.22.一种设备，其包含：22. A device comprising:处理器，其经配置以基于用于无线通信系统的可配置操作带宽确定可用子载波和保护子载波，所述操作带宽是选自与不同数目的保护子载波和固定正交频分多路复用(OFDM)符号持续时间相关联的多个带宽，且经配置以执行针对在所述可用子载波上发送的传输的处理，所述传输包含具有所述固定持续时间的OFDM符号；以及A processor configured to determine available subcarriers and guard subcarriers based on a configurable operating bandwidth for a wireless communication system, the operating bandwidth being selected from a different number of guard subcarriers and a fixed Orthogonal Frequency Division Multiplexing a plurality of bandwidths associated with (OFDM) symbol durations and configured to perform processing for transmissions sent on the available subcarriers, the transmissions comprising OFDM symbols having the fixed duration; and存储器，其耦合到所述处理器。memory coupled to the processor.23.一种设备，其包含：23. A device comprising:处理器，其经配置以执行针对传输的使用第一操作带宽发送的第一部分的处理，并执行针对所述传输的使用第二操作带宽发送的第二部分的处理；以及a processor configured to perform processing for a first portion of a transmission sent using a first operating bandwidth, and to perform processing for a second portion of the transmission sent using a second operating bandwidth; and存储器，其耦合到所述处理器。memory coupled to the processor.24.根据权利要求23所述的设备，其中所述第一部分对应于前导，且所述第二部分对应于所述传输的主体。24. The apparatus of claim 23, wherein the first portion corresponds to a preamble and the second portion corresponds to a body of the transmission.25.根据权利要求24所述的设备，其中所述第一操作带宽小于所述第二操作带宽。25. The apparatus of claim 24, wherein the first operating bandwidth is less than the second operating bandwidth.26.根据权利要求23所述的设备，其中所述处理器经配置以在用于所述传输的所述第一部分且基于所述第一操作带宽确定的第一组子载波上发送信令，且在用于所述传输的所述第二部分并基于所述第二操作带宽确定的第二组子载波上发送数据。26. The apparatus of claim 23, wherein the processor is configured to send signaling on a first set of subcarriers used for the first portion of the transmission and determined based on the first operating bandwidth, and sending data on a second set of subcarriers used for the second portion of the transmission and determined based on the second operating bandwidth.27.根据权利要求26所述的设备，其中所述信令包含用于所述传输的所述第二部分的参数的信息。27. The apparatus of claim 26, wherein the signaling includes information for parameters of the second portion of the transmission.28.根据权利要求27所述的设备，其中所述参数包含所述第二操作带宽、快速傅立叶变换(FFT)大小、循环前缀长度、跳频序列或其组合。28. The apparatus of claim 27, wherein the parameters include the second operating bandwidth, a Fast Fourier Transform (FFT) size, a cyclic prefix length, a frequency hopping sequence, or a combination thereof.29.根据权利要求23所述的设备，其中所述处理器经配置以接收来自用于所述传输的所述第一部分并基于所述第一操作带宽确定的第一组子载波的信令，且接收来自用于所述传输的所述第二部分并基于所述第二操作带宽确定的第二组子载波的数据。29. The apparatus of claim 23, wherein the processor is configured to receive signaling from a first set of subcarriers used for the first portion of the transmission and determined based on the first operating bandwidth, and receiving data from a second set of subcarriers used for the second portion of the transmission and determined based on the second operating bandwidth.30.根据权利要求29所述的设备，其中所述处理器经配置以处理所述信令以获得用于所述传输的所述第二部分的参数的信息，且基于从所述信令获得的所述信息来处理所述传输的所述第二部分。30. The apparatus of claim 29, wherein the processor is configured to process the signaling to obtain information for parameters of the second portion of the transmission, and based on of the information to process the second portion of the transmission.31.根据权利要求23所述的设备，其中所述处理器经配置以基于适用于所述第一部分的第一设计带宽的第一组参数值执行针对所述传输的所述第一部分的处理，且基于适用于所述第二部分的第二设计带宽的第二组参数值执行针对所述传输的所述第二部分的处理。31. The apparatus of claim 23, wherein the processor is configured to perform processing for the first portion of the transmission based on a first set of parameter values applicable to a first design bandwidth of the first portion, And processing for the second portion of the transmission is performed based on a second set of parameter values applicable to a second designed bandwidth of the second portion.32.根据权利要求31所述的设备，其中所述第一设计带宽处于适用于所述第一部分的第一组设计带宽中，且所述第二设计带宽处于适用于所述第二部分的第二组设计带宽中，所述第一组包括比所述第二组少的设计带宽。32. The apparatus of claim 31 , wherein the first design bandwidth is in a first set of design bandwidths applicable to the first portion, and the second design bandwidth is in a first set of design bandwidths applicable to the second portion. Of the two sets of designed bandwidths, the first set includes less designed bandwidth than the second set.33.根据权利要求23所述的设备，其中所述处理器经配置以基于适用于所述第一和第二部分的设计带宽的一组参数值执行针对所述传输的所述第一和第二部分的处理。33. The apparatus of claim 23, wherein the processor is configured to perform the first and second operations for the transmission based on a set of parameter values applicable to the design bandwidths of the first and second portions. Two-part processing.34.根据权利要求23所述的设备，其中所述第一操作带宽是选自可用于所述第一部分的第一组操作带宽，且其中所述第二操作带宽是选自可用于所述第二部分的第二组操作带宽。34. The apparatus of claim 23, wherein the first operating bandwidth is selected from a first set of operating bandwidths available for the first portion, and wherein the second operating bandwidth is selected from a set of operating bandwidths available for the first portion Part two of the second set of operating bandwidths.35.根据权利要求34所述的设备，其中所述第一组包括比所述第二组少的操作带宽。35. The apparatus of claim 34, wherein the first set includes less operating bandwidth than the second set.36.一种方法，其包含：36. A method comprising:执行针对传输的使用第一操作带宽发送的第一部分的处理；以及performing processing for the first portion of the transmission sent using the first operating bandwidth; and执行针对所述传输的使用第二操作带宽发送的第二部分的处理。Processing is performed for a second portion of the transmission sent using a second operating bandwidth.37.根据权利要求36所述的方法，其进一步包含：37. The method of claim 36, further comprising:在用于所述传输的所述第一部分且基于所述第一操作带宽确定的第一组子载波上发送信令；以及sending signaling on a first set of subcarriers used for the first portion of the transmission and determined based on the first operating bandwidth; and在用于所述传输的所述第二部分且基于所述第二操作带宽确定的第二组子载波上发送数据。Data is sent on a second set of subcarriers used for the second portion of the transmission and determined based on the second operating bandwidth.38.根据权利要求36所述的方法，其进一步包含：38. The method of claim 36, further comprising:接收来自用于所述传输的所述第一部分且基于所述第一操作带宽确定的第一组子载波的信令；以及receiving signaling from a first set of subcarriers determined based on the first operating bandwidth for the first portion of the transmission; and接收来自用于所述传输的所述第二部分且基于所述第二操作带宽确定的第二组子载波的数据。Data is received from a second set of subcarriers used for the second portion of the transmission and determined based on the second operating bandwidth.39.根据权利要求38所述的方法，其中所述执行针对所述第一部分的处理包含处理所述信令以获得用于所述传输的所述第二部分的参数的信息，且其中所述执行针对所述第二部分的处理包含基于从所述信令获得的所述信息来处理所述传输的所述第二部分。39. The method of claim 38, wherein said performing processing for said first portion comprises processing said signaling to obtain information for parameters of said second portion of said transmission, and wherein said Performing processing for the second portion includes processing the second portion of the transmission based on the information obtained from the signaling.40.一种设备，其包含：40. A device comprising:用于执行针对传输的使用第一操作带宽发送的第一部分的处理的装置；以及means for performing processing for the first portion of the transmission sent using the first operating bandwidth; and用于执行针对所述传输的使用第二操作带宽发送的第二部分的处理的装置。means for performing processing for a second portion of the transmission sent using a second operating bandwidth.41.根据权利要求40所述的设备，其进一步包含：41. The device of claim 40, further comprising:用于在用于所述传输的所述第一部分并基于所述第一操作带宽确定的第一组子载波上发送信令的装置；以及means for sending signaling on a first set of subcarriers used for said first portion of said transmission and determined based on said first operating bandwidth; and用于在用于所述传输的所述第二部分并基于所述第二操作带宽确定的第二组子载波上发送数据的装置。means for transmitting data on a second set of subcarriers used for said second portion of said transmission and determined based on said second operating bandwidth.42.根据权利要求40所述的设备，其进一步包含：42. The device of claim 40, further comprising:用于接收来自用于所述传输的所述第一部分且基于所述第一操作带宽确定的第一组子载波的信令的装置；以及means for receiving signaling from a first set of subcarriers used for said first portion of said transmission and determined based on said first operating bandwidth; and用于接收来自用于所述传输的所述第二部分且基于所述第二操作带宽确定的第二组子载波的数据的装置。means for receiving data from a second set of subcarriers used for the second portion of the transmission and determined based on the second operating bandwidth.43.根据权利要求42所述的设备，其中所述用于执行针对所述第一部分的处理的装置包含用于处理所述信令以获得用于所述传输的所述第二部分的参数的信息的装置，且其中所述用于执行针对所述第二部分的处理的装置包含用于基于从所述信令获得的所述信息来处理所述传输的所述第二部分的装置。43. The apparatus of claim 42, wherein the means for performing processing for the first portion comprises means for processing the signaling to obtain parameters for the second portion of the transmission information, and wherein the means for performing processing for the second portion comprises means for processing the second portion of the transmission based on the information obtained from the signaling.

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