CN102696210A - Multiple access system, method and device based on orthogonal frequency division multiplexing - Google Patents
Multiple access system, method and device based on orthogonal frequency division multiplexing Download PDFInfo
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- CN102696210A CN102696210A CN2011800024848A CN201180002484A CN102696210A CN 102696210 A CN102696210 A CN 102696210A CN 2011800024848 A CN2011800024848 A CN 2011800024848A CN 201180002484 A CN201180002484 A CN 201180002484A CN 102696210 A CN102696210 A CN 102696210A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0091—Signaling for the administration of the divided path
- H04L5/0094—Indication of how sub-channels of the path are allocated
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0037—Inter-user or inter-terminal allocation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
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Abstract
An embodiment of the invention provides a multiple access system, method and device based on orthogonal frequency division multiplexing. The multiple access system based on orthogonal frequency division multiplexing includes a transmitting terminal and a receiving terminal. The transmitting terminal determines one or more resource blocks supporting business data transmission of a particular user terminal, the business data and a resource belonging mark of the particular user terminal are mapped to the one or more resource blocks to generate multi-carrier signals modulated via multiple subcarriers, wherein, the resource belonging mark is mapped in a control resource zone in the particular resource zone. The receiving terminal identifies a resource block belonging to the particular user terminal according to the resource belonging mark mapped in a control resource zone in the particular resource zone, and obtains the business data from the data resource zone of the resource block belonging to the particular user terminal.
Description
Technical field
The present invention relates to the communication technology, be specifically related to a kind of based on OFDM (Orthogonal frequency-division multiplexing, multi-address system OFDM), method and apparatus.
Background technology
Multiple access (Multiple Access) technology is meant and inserts a common transmission medium to a plurality of users that are in diverse location, realizes the technology of each telex network.Multiple access technology is used for sharing the medium scene, generally includes radio communication, and wire communication such as coaxial cable network (Coaxial cable) insert, power line inserts or the like.Multiple access technology is called " multiple access connection " technology again.Multiple access technology generally includes time division multiple access, frequency division multiple access, code division multiple access or the like.
OFDM is a kind of multi-carrier modulation technology, in many documents OFDM also be called as Discrete multi-tone (Discrete Multitone, DMT).OFDM is divided into a plurality of rate data streams with high-speed data-flow, and parallel being modulated on a plurality of orthogonal subcarriers of a plurality of rate data streams transmitted.Each subcarrier of OFDM is mutually orthogonal, and the cycle of each subcarrier all keeps the relation of integral multiple with other subcarriers in an OFDM symbol period, and each subcarrier and adjacent sub-carrier differ 1 cycle.OFDM can be widely used in various broadband wirelesss and the wire communication, and (Digital Subscriber Line is DSL) in the system like WLAN, Digital Subscriber Line.
Multiple access technology based on the OFDM modulation technique generally comprises two kinds; One is based on time division multiple access (the Time Division Multiple Access of OFDM; TDMA) technology; Another kind is OFDM (Orthogonal Frequency Division Multiple Access, an OFDMA) technology.Based on the tdma of OFDM modulation, be that elementary cell is carried out time division multiple access with the OFDM symbol, through distributing the distribution that the OFDM symbol is realized resource on the different time sheet, realize that multiple access inserts between the different user of consolidated network.
The worldwide interoperability for microwave that can be applied to OFDMA insert (Worldwide Interoperability for Microwave Access, WiMAX), (Long Term Evolution LTE) waits and the communications fields such as cable TV coaxial network Long Term Evolution.In the OFDMA technology, transfer resource is divided into the symbol of some predetermined lengths on time domain, and on frequency domain, is divided into a series of subcarriers of the non-overlapping copies of quadrature.Thus, to each transmission frame, formed the OFDMA transfer resource on two dimensions of time domain and frequency domain.Further, the OFDMA transfer resource can be distributed to a plurality of different user terminals, through this OFDMA transfer resource is divided into a plurality of Resource Block, and realizes that the multi-user inserts to corresponding user each resource block assignments.Wherein, in this article, Resource Block can refer to the minimum division unit of OFDMA transfer resource.Based on different application scenes, Resource Block can be rendered as different forms, for example can be the Physical Resource Block that defines in the LTE related protocol (Physical Resource Block, PRB), the time slot (slot) that relates in the WiMAX technology etc.
In the prior art, adopt independently public resource usually, give the multiple users that inserts through the announcement of broadcast type the resource allocation information and the modulation coding information of all user terminals.User terminal need safeguard that independently public resource obtains resource allocation information and the modulation coding information that broadcasting is announced, so that follow-up location belongs to the OFDM frame of the bearer service data of user terminal oneself.The drawback of this mode is need be at independently public resource bearing resource assignment information, modulation coding information or the like, and is bigger to taking of resource.
Summary of the invention
For solving the problems of the technologies described above, the invention provides multi-address system, method and apparatus based on OFDM.
One aspect of the present invention provides a kind of sending method; This sending method is applied to the multi-address system based on OFDM; Comprise: one or more Resource Block of confirming the business data transmission of support specific user terminal; The particular resource block of said one or more Resource Block comprises control resource-area and data resource district, and each Resource Block comprises the data resource district; The business datum and the resource home identity of specific user terminal are mapped to said one or more Resource Block to generate the multi-carrier signal through a plurality of subcarrier-modulated, and wherein, said resource home identity is mapped to said control resource-area; Send said multi-carrier signal.
The present invention provides a kind of method of reseptance on the other hand; This method of reseptance is applied to the multi-address system based on OFDM; Comprise: receive multi-carrier signal through a plurality of subcarrier-modulated; The corresponding a plurality of Resource Block of said a plurality of subcarrier, the particular resource block in said a plurality of Resource Block comprises control resource-area and data resource district; From the corresponding a plurality of subcarriers of said particular resource block inner control resource-area, obtain the resource home identity; Confirm that according to the resource home identity said particular resource block belongs to specific user terminal; From the corresponding subcarrier in the data resource district of said particular resource block, obtain business datum.
The present invention provides a kind of device on the other hand, and this device is applied to the multi-address system based on OFDM, comprising:
The resource control module; Be used for confirming to support one or more Resource Block of specific user terminal business data transmission; Generate control command, the control information that this control command indication will comprise the resource home identity is mapped to the particular resource block of said one or more Resource Block;
The signal generation module; Be used to respond said control command; The control information that will comprise the resource home identity is mapped to the control resource-area in the said particular resource block; And the data resource district in said one or more Resource Block shines upon the business datum of said specific user terminal, exports in said at least one or a plurality of Resource Block multi-carrier signal through multi-carrier modulation;
Sending module is used for the multi-carrier signal with mapping block output.
Further aspect of the present invention provides a kind of device, is applied to the receiving terminal based on the multi-address system of OFDM, and this device comprises:
Receiver module is used to receive the multi-carrier signal through a plurality of subcarrier-modulated, the corresponding a plurality of Resource Block of said a plurality of subcarriers, and the particular resource block in said a plurality of Resource Block comprises control resource-area and data resource district;
The control information detection module is used for comprising from the subcarrier acquisition of said control resource-area the control information of resource home identity, and control information is sent to the resource control module;
The resource control module; Be used for confirming that according to the resource home identity said particular resource block belongs to specific user terminal; And the generation control command, this control command designation data extraction module receives multi-carrier signal and from the corresponding subcarrier in the data field of said particular resource block, obtains business datum;
Data extraction module is used for the indication according to the resource control module, from the corresponding subcarrier in the data field of said particular resource block, obtains business datum.
Further aspect of the present invention also provides a kind of multi-address system based on OFDM, comprises the device that is arranged at local side and user terminal.
Adopt scheme of the present invention, can realize a kind of more healthy and stronger information interaction,, and can time delay still less be provided, bring better user experience for system so that avoid can't demodulation centralized broadcast message and the consequence brought.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art; To do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work property, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 shows the sending method according to the embodiment of the invention;
Fig. 2 shows the method for reseptance according to the embodiment of the invention;
Fig. 3 shows the Resource Block of dividing according to an embodiment of the invention;
Fig. 4 shows the Resource Block of dividing in accordance with another embodiment of the present invention;
Fig. 5 shows the sketch map of resource block mapping according to an embodiment of the invention;
Fig. 6 shows the device in the OFDMA system according to an embodiment of the invention;
Fig. 7 shows according to the device in the OFDMA system of the embodiment of the invention;
Fig. 8 shows wireless communication system according to an embodiment of the invention; And
Fig. 9 shows wired communication system according to an embodiment of the invention.
Embodiment
Be elaborated in the face of the multiple access based on OFDM (Multiple Access) system, the whole bag of tricks and device down according to the embodiment of the invention.
In various embodiment of the present invention, comprise local side and a plurality of user terminal in the multi-address system based on OFDM.Support transmitted in both directions between local side and the user terminal: to the user terminal transmission direction, local side is that transmitting terminal, user terminal are receiving terminals at local side; To the local side transmission direction, user terminal is a transmitting terminal at user terminal, and local side is a receiving terminal.User terminal in the various embodiments of the present invention is meant the terminal equipment with OFDM modulator, can be any apparatus that mobile terminal device, WiFi terminal equipment, WiMax terminal equipment, LTE terminal equipment, Cable access terminal etc.Local side of the present invention can be the base station of wireless communication system, also can be the head end or the central station of wired communication system.
The multi-address system based on OFDM that the embodiment of the invention provides can be based on the fdma system (being the OFDMA system) of OFDM modulation, the time-division multiple address system of perhaps modulating based on OFDM.In the OFDMA system, share the available frequency domain resource based on frequency division multiplexing on a plurality of user terminal frequency domains, each user terminal can be assigned to a plurality of subcarriers, and the subcarrier of a plurality of user terminals can be different.In the time-division multiple address system based on the OFDM modulation, the subcarrier of a plurality of user terminals is identical, shares available time-domain resource based on time division multiplexing on the time domain.
Running time-frequency resource can be divided into a plurality of Resource Block between transmitting terminal and the receiving terminal, takies a plurality of subcarriers on each Resource Block frequency domain, takies the two-dimentional running time-frequency resource district of certain hour length on the time domain.The certain hour length that takies on the time domain can be set as required, for example the integral multiple of OFDM symbol period.Usually each Resource Block takies a plurality of subcarriers and a plurality of symbol; With 1 symbol lengths is that minimum dividing unit is an example on the time domain; The running time-frequency resource that takies 1 number of sub-carrier and 1 symbol is called a Resource Unit (Resource Element; RE), then each Resource Block comprises a plurality of Resource Units.In the OFDMA system, the Resource Block of available running time-frequency resource can carry out in time domain and two dimensions of frequency domain in the system; In the time-division multiple address system based on the OFDM modulation, the Resource Block of available running time-frequency resource only needs to carry out in dimension of time domain in the system.
In transmission method provided by the invention and system, part Resource Block at least, its two-dimentional running time-frequency resource district can be divided at least two sub-areas, and at least one subarea is as the control resource-area, and at least one subarea is as the data resource district.Shine upon the resource home identity so that the ownership of receiving terminal recognition resource piece at the control resource-area.Mainly comprise following content.
Processing on transmitting terminal comprises: in the S110 step; Confirm one or more Resource Block of the business data transmission of support specific user terminal; The particular resource block of said one or more Resource Block comprises control resource-area and data resource district, and each Resource Block comprises the data resource district; In the S120 step, the business datum of specific user terminal and resource home identity are mapped to said one or more Resource Block to generate the multi-carrier signal through a plurality of subcarrier-modulated, wherein, said resource home identity is mapped to said control resource-area; In the S130 step, send said multi-carrier signal.
Processing on receiving terminal comprises: among the step S210, receive multi-carrier signal through a plurality of subcarrier-modulated, and the corresponding a plurality of Resource Block of said a plurality of subcarriers, each Resource Block comprises the data resource district.A plurality of Resource Block comprise at least one particular resource block, each a specific control resource-area and data resource district of comprising.Among the step S220, obtain the resource home identity in the subcarrier of particular resource block inner control resource-area correspondence; Among the step S230, confirm that according to the resource home identity particular resource block belongs to specific user terminal; Among the step S240, from the corresponding subcarrier in the data resource district of said particular resource block, obtain the business datum of said specific user terminal.
On transmitting terminal; The resource allocation information of this specific user terminal Resource Block also can be shone upon in the controlled area; The combined information of resource home identity and resource allocation information is used to identify the Resource Block of the business datum that is mapped with this specific user terminal; So that receiving terminal is confirmed the Resource Block that this specific user terminal is all according to the combined information of resource home identity and resource allocation information, and receive the business datum on the Resource Block of confirming.Accordingly, on transmitting terminal, the business datum of this specific user terminal of mapping on all Resource Block of the combined information of resource home identity and resource allocation information sign.
Accordingly; Processing on receiving terminal can also comprise: from the corresponding subcarrier in controlled area, obtain resource block assignments information; Utilize the combined information of resource home identity and resource block assignments information to confirm all Resource Block of this specific user terminal, from the corresponding subcarrier in the data resource district of all Resource Block, obtain the business datum of said specific user terminal.
Above-mentioned resource home identity is used for identifying subscriber terminal; It can be the physical label of user terminal; Like terminal iidentification (Terminal Identifier), port-mark, terminal sequence code, address information (like Internet protocol (Internet Protocol; IP) one or more combination of address or media interviews controls (Media Access Control, MAC) address etc.); The resource home identity can be the logical identifier of user terminal also, as distributes to ID (User Identifier), the LLID of this user terminal.A user terminal can comprise one or more LLIDs; The corresponding unique user terminal of each LLID; System can realize the service quality (Quality of Service) of different business etc. through the management to logical links like this.Receiving terminal need detect the ownership of resource/data through LLID in this case, and this can be applied in the passive optical network based on OFDM.The resource home identity also can be the combination of the physical label and the logical identifier of user terminal.
Receiving terminal is at user terminal, and like the situation on the specific user terminal, receiving terminal can be judged the ownership of resource according to the resource home identity, particularly judges whether to belong to this user terminal.If obtain resource home identity A the controlled area of receiving terminal in another Resource Block A, judge that according to resource home identity A Resource Block A does not belong to this user terminal, does not then further handle Resource Block A.The situation of receiving terminal on local side, which user terminal receiving terminal can judge resource from according to the resource home identity, thereby carries out one or more processing such as traffic statistics, performance monitoring, QoS of survice scheduling to the Business Stream at same subscriber terminal.
The resource home identity can take certain bit, for example can use 6 bits to support 64 users; (Cyclic Redundancy Check is CRC) to guarantee the correctness of resource home identity can also to adopt certain bit to do CRC.In addition, can also simply encode to the resource home identity is carried in the corresponding subcarrier, and these can accurately be obtained for the resource home identity.
In the embodiments of the invention expansion, the controlled area can also be shone upon and be used to describe the Resource Properties information of transmitting terminal to the Resource Block of receiving terminal, and receiving terminal can receive processing to the corresponding subcarrier of Resource Block accordingly according to this Resource Properties information.For example, Resource Properties information comprises coding and modulation scheme class information, and receiving terminal can carry out corresponding demodulation sign indicating number processing to the corresponding subcarrier in the data field of Resource Block according to this coding and modulation scheme class information.For another example; Resource Properties information comprises the power control information of transmitting terminal to the multi-carrier signal of receiving terminal, and receiving terminal can be handled at least a reception that the corresponding subcarrier in the data field of Resource Block carries out corresponding filtering parameter adjustment and gain parameter adjustment according to this power control information.
Each Resource Block all can comprise data resource district and control resource-area, and receiving terminal can mail to which user terminal (receiving terminal is on the user terminal) according to its place Resource Block of resource home identity identification of control resource-area or from which user terminal (receiving terminal is on local side).
In embodiments of the present invention, the control resource-area is distributed on the symbol and subcarrier of preferential traversal, and wherein, receiving terminal travels through Resource Block from time and frequency axis, the preferential time.Usually, on the frequency domain, the initial subcarrier of control resource-area is consistent with the initial subcarrier of its place Resource Block, and the number of subcarrier is less than or equal to the subcarrier number of its place Resource Block.On the time domain, initial a period of time length on the control resource-area holding time axle.For example, the control resource-area has taken all subcarriers of its place Resource Block, control resource-area and data resource district time division multiplexing on the time domain.
According to the embodiment of the invention, a kind of sending method is provided, this method can be applicable to comprise the multiple access system of local side and a plurality of user terminals.Usually, support transmitted in both directions between local side and the user terminal.For clarity sake, will be used for local side and be called the downlink resource piece, will be used for user terminal and be called the ascending resource piece to the Resource Block of the transmission of local side to the Resource Block of the transmission of user terminal.With the descending example that is transmitted as sending method of the present invention is described below.
Local side is that user terminal distributes the downlink resource piece of supporting the downlink service data transmission.User terminal comprises specific user terminal at least, and local side can be the Any user terminal distribution downlink resource piece that activates.Local side can periodically be a user terminal allocation of downlink Resource Block according to certain assignment period, and the resource block assignments information of the Resource Block that is distributed can store in the volatibility or non-volatile memory medium of local side, uses so that professional mapping to be provided.
The data resource district that local side is mapped to Resource Block respectively with the business datum and the resource home identity of user terminal and control resource-area are to generate the corresponding multi-carrier signal of this Resource Block; The resource home identity can be represented the attaching relation of Resource Block and user terminal.For example; In distributing to the Resource Block of specific user terminal, not only comprise the data resource district but also comprise the control resource-area; Local side shines upon the business datum and the resource home identity of this user terminal respectively at these two resource-areas; So that user terminal can obtain business datum from the corresponding subcarrier in the data field of respective resources piece after this resource home identity of identification.Local side can be used to identify the attaching relation of this downlink resource piece and this specific user terminal in the control resource-area mapping resource home identity of each downlink resource piece of specific user terminal.Local side also can be at the part Resource Block of a plurality of downlink resource pieces of specific user terminal, like first Resource Block, control resource-area mapping user attaching sign and resource block assignments information, specific user terminal can be confirmed other Resource Block with resource allocation information.
For same user terminal, the resource home identity in the different resource piece is identical, and Resource Properties information can be different.Adopt this scheme; Because each downlink resource piece all comprises the resource home identity; Can adopt the resource home identity to represent the downlink resource piece, need in public control information Resource Block, not broadcast the resource block assignments information of the downlink resource piece of a plurality of user terminals.In another embodiment of the present invention; When distributing to a plurality of continuous downlink resource piece of user terminal; Only need mapping resource home identity and resource block assignments information in a Resource Block (like first Resource Block); Adopt this mode also littler, and the Resource Block transmission cycle is shorter than the dispatching cycle of control information Resource Block, dispatches more flexible than the delay of the resource block assignments information of the downlink resource piece of a plurality of user terminals of broadcasting in public control information Resource Block.
The Resource Properties information that can also comprise the ascending resource piece in the control resource-area, the timing of for example indicating upgoing O FDM symbol to send shifts to an earlier date (Timing Advance, TA) information.Above-mentioned TA information is offered user terminal, can be so that the side-play amount that user terminal is indicated current transmission timing reference adjustment TA information.Adopt this mode, only need the timing relative displacement can reduce complexity regularly, and amount of information is few.
Similar with sending method, according to the embodiment of the invention, a kind of method of reseptance is provided, this method can be applicable to comprise the multi-address system of local side and a plurality of user terminals.With the descending example that is transmitted as method of reseptance of the present invention is described below, it comprises following content.
Receiving terminal receives the multi-carrier signal through a plurality of subcarrier-modulated, the corresponding a plurality of downlink resource pieces of said a plurality of subcarriers, and at least one specific downlink resource piece comprises control resource-area and data resource district.User terminal obtains the resource home identity from the corresponding subcarrier of control resource-area; Confirm that according to the resource home identity this specific downlink resource piece belongs to specific user terminal, thereby from the corresponding subcarrier in the data resource district of said specific downlink resource piece, obtain business datum.Receiving terminal also obtains resource block assignments information from the corresponding subcarrier of control resource-area; Confirm to belong to all downlink resource pieces of specific user terminal based on resource home identity and resource block assignments information, and from the corresponding subcarrier in the data field of downlink resource piece, obtain business datum.Receiving terminal can also detect the Resource Properties information in the controlled area, according to Resource Properties information the corresponding subcarrier in downlink resource blocks of data district is received processing accordingly.For example, Resource Properties information comprises the modulation and the encoding scheme class information of data field, and receiving terminal can carry out corresponding demodulation sign indicating number processing to the corresponding subcarrier in data field according to modulation and encoding scheme class information.And for example, Resource Properties information comprises the power control information of downlink resource piece subcarrier, and receiving terminal can be according to power control information to subcarrier filtering parameter, gain parameter adjustment.Above-mentioned receiving terminal can be positioned at or itself be specific user terminal.Above-mentioned receiving handling method can be applied to any user terminal of multi-address system.
In another embodiment of the present invention, insert under the scene, at the current transmission cycle downlink resource piece RB of (or claiming transmission time slot) at the OFDMA multiple access
D_TkThe Resource Block information of middle Resource Block information of carrying only is applied to downlink resource piece RB in follow-up one or more transmission cycle
D_Tk+1, RB
D_Tk+2In other words, lag behind at least one transmission cycle of downlink resource piece of bearing resource block message on the downlink resource piece time domain of application resource block message, Resource Block information can not be applied to the downlink resource piece of current transmission cycle.Adopt downlink resource piece RB
D_TkIn information to the predetermined downlink resource piece RB of subsequent transmission in the cycle
D_Tk+1, RB
D_Tk+2On signal processing, can be provided enough times to user terminal, reduce the synchronous complexity and the influence of delay.To guarantee that user terminal has time enough to prepare, and takes over seamlessly.Wherein, subscript D representes descending, and Tk, Tk+1, Tk+2 represent k, k+1, a k+2 transmission cycle respectively.
At user terminal in the method for the transmission direction of local side; With the particular terminal is example; Specific user terminal is confirmed the ascending resource piece through the resource block assignments information of the ascending resource piece that issues from local side; The resource block assignments information of this ascending resource piece can be that the controlled area of downlink resource piece sends over, and also can adopt existing mode to issue through broadcast channel.The ascending resource piece that specific user terminal is sent also can be divided into data resource district and control resource-area; Specific user terminal can be in control resource-area mapping resource home identity; The ascending resource piece that expression is sent and the attaching relation of user terminal, the ascending resource piece that is promptly sent are that this specific user terminal is sent.In addition, this specific user terminal also can be in the Resource Block distributed intelligence of controlling resource-area mapping uplink Resource Block so that local side be confirmed all ascending resource pieces of this specific user terminal according to the combined information of resource home identity and resource block assignments information.The control resource-area can also shine upon user resources solicited message or resource state information so that local side is that user terminal distributes the ascending resource piece according to these information of control resource-area.
Accordingly, local side receives the multi-carrier signal through a plurality of subcarrier-modulated, the corresponding a plurality of ascending resource pieces of said a plurality of subcarriers, and at least one ascending resource piece comprises control resource-area and data resource district.Local side obtains the resource home identity from the corresponding subcarrier of control resource-area; Confirm that according to the resource home identity ascending resource piece that comprises the resource home identity belongs to specific user terminal, from the corresponding subcarrier in the data resource district of the said ascending resource piece that comprises the resource home identity, obtain business datum.Local side also obtains resource block assignments information from the corresponding subcarrier of control resource-area; Confirm to belong to all ascending resource pieces of this specific user terminal based on the combined information of resource home identity and resource block assignments information, and from the corresponding subcarrier in the data field of ascending resource piece, obtain business datum.Local side can also detect the Resource Properties information in the controlled area, according to Resource Properties information the corresponding subcarrier in ascending resource blocks of data district is received processing accordingly.For example, Resource Properties information comprises that the modulation of data field and encoding scheme class information local side can carry out corresponding demodulation sign indicating number processing to the corresponding subcarrier in data field according to modulation and encoding scheme class information.And for example, Resource Properties information comprises the power control information of ascending resource piece subcarrier, and local side can be according to power control information to subcarrier filtering parameter, gain parameter adjustment.
Fig. 3 shows Resource Block that inserts embodiment based on the OFDMA multiple access according to the present invention.
In Fig. 3, show the example of Resource Block through the square frame of black.A continuous N symbol and continuous M number of sub-carrier.M and N are the positive integers more than or equal to 2.In the embodiment shown in fig. 3, Resource Block takies several continuous symbols on time domain, on frequency domain, also occupies continuous plurality of sub carrier wave.Although a Resource Block only is shown among Fig. 3, it is pointed out that the size of each Resource Block of being divided can be identical, also can be different.
For example, in the remodeling of embodiment shown in Figure 3, consider and realize going up Effect on Performance that the N that comprises in a Resource Block symbol and M number of sub-carrier also can be discontinuous, also can adopt the subcarrier of dispersion or the symbol of dispersion.Each Resource Block is a variable size.The different resource block size can be identical, also can be different.
In addition, in another remodeling of embodiment shown in Figure 3, as a kind of implementation more flexibly, symbol that Resource Block takies and subcarrier can be discontinuous.That is, constitute a Resource Block by the symbol of a plurality of dispersions and the subcarrier of a plurality of dispersions.And similarly, the size of each Resource Block can be identical, also can be different.
Embodiment shown in Figure 3 and this paper mention with other NM various variant as going for the application scenarios of LTE.
Fig. 4 shows according to the present invention another Resource Block that inserts the division of embodiment based on the OFDMA multiple access.In the embodiment shown in fig. 4, can distribute a plurality of continuous Resource Block (continuous on time domain or frequency domain) for user terminal (for example, the bigger user terminal of data volume).A plurality of continuous Resource Block formation Resource Block groups (Resource Block Group, RBG), like RBG1, RBG2 ..., RBG5.
In Fig. 4, show the Resource Block group of distributing with black box to each user terminal.
It is pointed out that in the embodiment shown in fig. 4 the number of the Resource Block that the Resource Block group comprises can be identical, also can be inequality.In addition, as shown in Figure 4, on time domain, in the most forward a plurality of Resource Block frequency domain is in Resource Block headed by the primary Resource Block definition, like figure RB1, RB2 ..., RB5.Fig. 4 is merely example, the invention is not restricted to this, for example, in also can be on frequency domain the most forward a plurality of Resource Block time domain is in Resource Block headed by the primary Resource Block definition.
Embodiment shown in Figure 4 for example goes for the application scenarios of WiMax.
Said Resource Properties information can comprise modulation and/or the class information of encoding scheme on the Resource Block of being divided.Each modulation scheme can corresponding grade of transmission in a plurality of modulation schemes.Each encoding scheme can corresponding grade of transmission in a plurality of encoding schemes.Modulation and encoding scheme are combined to form a plurality of modulating-coding assembled schemes, the corresponding grade of transmission of each scheme.The corresponding relation of all configurable modulation and/or encoding scheme and grade on local side and user terminal, the corresponding modulation volume of each grade/or encoding scheme.Like this, local side will be modulated and/or the class information of encoding scheme.Send to user terminal, user terminal just can be confirmed corresponding modulation and/or encoding scheme according to class information.
Modulation scheme; Be applied to subcarrier-modulated; Include but not limited to QPSK (Quadrature Phase Shift Keying; QPSK), 16 ary quadrature amplitude (16 Quadrature Amplitude Modulation, 16QAM), 256 ary quadrature amplitude (256 Quadrature Amplitude Modulation, 256QAM) etc.Encoding scheme is applied to digital coding, includes but not limited to the method or the coding parameter of chnnel coding, like code check, code block size etc.In practical implementation, can different modulation schemes and encoding scheme be done a classification, finally list the combination of some kinds of Modulation and Coding Scheme, as the Modulation and Coding Scheme in the LTE technology (Modulation and Coding Scheme, MCS).
Above-mentioned Resource Properties information can encapsulate with various forms, for example adopts the form of type-length-value (Type-Length-Value) to encapsulate.Each information of Resource Properties information can be distributed a types value, and such offset is used for the information type of identifying resource attribute information.
Fig. 5 shows sketch map that inserts the resource block mapping of embodiment based on the OFDMA multiple access according to the present invention.In Fig. 5, be depicted as the Resource Block of each user terminal distribution with the square frame of black.In the embodiment shown in fig. 5, each Resource Block can comprise N symbol and M number of sub-carrier.Wherein, the grid that shade is filled representes to control resource-area, white expression data resource district.As shown in Figure 5, can be on the time domain of each Resource Block on first symbol, the frequency domain running time-frequency resource district of 6 number of sub-carrier in the M number of sub-carrier as the control resource-area, bearing resource block message on the control resource-area.For example, in the embodiment shown in fig. 5, can be on the time domain of each Resource Block the go forward running time-frequency resource of 6 number of sub-carrier of first OFDM symbol, frequency domain be defined as the control resource-area.In addition, can take a plurality of OFDM symbol lengths on the control resource-area time domain, also be not limited only to 6 number of sub-carrier on the frequency domain, can take all subcarriers of whole Resource Block.
It is pointed out that embodiment shown in Figure 5 also is merely example, the invention is not restricted to this.In fact, the subcarrier that is used for the bearing resource block message in the downlink resource piece can be the optional position of Resource Block.These subcarriers can be the plurality of sub carrier waves that is positioned at first OFDM symbol, also can be positioned at second, the 3rd symbol, further can also be the subcarriers that disperses a plurality of distinct symbols position in the same Resource Block.
The foregoing description all is the embodiment that has described based on the multi-address system of OFDMA, below simple the description down based on the OFDM modulation embodiment that inserts of time division multiple access down.
Insert under the scene in time division multiple access based on the OFDM modulation; The elementary cell of resource is the OFDM symbol; Same, with the corresponding Resource Block of an OFDM symbol, system can be used for the plurality of sub carrier wave of fixed position on the OFDM symbol bearing resource home identity and/or modulation coding information; Receiving terminal just can obtain these information through the subcarrier of demodulation fixed position after receiving said OFDM symbol like this.Same for all user terminals can both demodulate these information, general adopts fixing modulation coding mode to these subcarriers.Like this, system pays wages and carries these control informations with regard to having saved special symbol.
Same, we can be referred to as these subcarriers the control resource-area of this symbol/Resource Block, and other available subcarriers are called the data resource district.
In addition; If system distributes continuous a plurality of OFDM symbols to user terminal; System can select the symbol that each is independent as Resource Block and control resource-area bearing resource home identity and/or modulation coding information in each Resource Block; Perhaps system can be with continuous a plurality of symbols as the Resource Block group, is chosen in the middle of the Resource Block group quantity information etc. that the control resource-area of first Resource Block for example carries above-mentioned information and continuous symbol.
For example; Consider actual application scenarios, in the application scenarios of coaxial cable (Coaxial Cable) point-to-multipoint network, because the interchannel noise environment is all more stable; For the user terminal Resources allocation or inform the modulating-coding class information after; Do not need each Resource Block all to carry these information, so the modulating-coding class information do not need frequent notifications for same user terminal, like this; Do not need each transmission cycle or transmission time slot all need take the resource of control resource-area, thereby can be available transmission other Resource Properties information or business datum.
Similar with above-mentioned method, embodiments of the invention also provide corresponding device thereof.
Fig. 6 shows according to an embodiment of the invention based on the device in the multi-address system of OFDM.This device is arranged at transmitting terminal, for example can be arranged on network side.
As shown in Figure 6, said device comprises mapping block 610, resource control module 630 and sending module 650, resource control module 650.
Sending module 650 is coupled to mapping block 610, is used for the multi-carrier signal of mapping block 610 outputs is sent.
Digital coding and modulation module 612 are used for business datum (like the figure data flow) is encoded and modulated, and export in the data resource district of said one or more Resource Block the multi-carrier signal through a plurality of subcarrier-modulated.Each user terminal can corresponding one or more digital coding and modulation module 612.Adopt the user terminal of identical modulation and encoding scheme time-multiplexed mode to share same digital coding and modulation module 612.
Control information coding and modulation module 614 are used to obtain comprising the control information of resource home identity, and control information is modulated and encoded, and export in the control resource-area of said particular resource block the multi-carrier signal through a plurality of subcarrier-modulated;
Multiplexing module 616 is used for the subcarrier multiplex with digital coding and modulation module 612 and control information coding and modulation module 614 outputs.
Wherein, control information is mapped to the Resource Block that comprises control resource-area and data resource district.
In one embodiment; Resource control module 630 can be exported to Multiplexing module 616 with first control command and second control command, and Multiplexing module is according to the output signal of first control command and second control command selectivity output control information coding and modulation module 614 and digital coding and modulation module 612.Wherein, control information coding and modulation module 614 can obtain control information from resource control module 630, and like the resource home identity, perhaps the combined information of resource home identity and resource allocation information certainly, can also comprise Resource Properties information.The particular content of resource home identity, resource allocation information and Resource Properties information repeats no more referring to the content of each embodiment of preceding text.Digital coding and modulation module 612 can obtain coding and/or coding and/or the modulation scheme of modulation scheme to upgrade business datum to be sent from resource control module 630, and utilize coding and modulation scheme after upgrading that business datum is encoded and modulation treatment.
In another embodiment; Resource control module 630 also can be exported to control information coding and modulation module 614 and digital coding and modulation module 612 respectively with first control command and second control command, and control information coding and modulation module 614 output signal to Multiplexing module 616 according to first control command and second control command respectively with digital coding and modulation module 612.
In the one embodiment of the invention; Signal on the signal time-frequency domain that signal generation module 610 generates; Sending module 650 can become the conversion of signals of frequency domain the signal of time domain; For example through invert fast fourier transformation (Inverse fast Fourier transform, IFFT), Filtering Processing, digital-to-analogue conversion, analog etc., the output time-domain signal.Accordingly, sending module 650 can comprise IFFT unit, filter unit, D/A conversion unit, analog circuit etc. and realizes above-mentioned functions respectively.The realization of these functions can be repeated no more with reference to prior art.
Fig. 7 show according to an embodiment of the invention based in the multi-address system of OFDM device 700.This device 700 is arranged at receiving terminal, for example can be applied to user terminal.
As shown in Figure 7, device 700 comprises receiver module 710, control information detection module 720, data extraction module 730 and resource control module 740.Receiver module 710 is used to receive the multi-carrier signal through a plurality of subcarrier-modulated, a plurality of Resource Block of said a plurality of subcarriers, and the particular resource block in said a plurality of Resource Block comprises control resource-area and data resource district.
Control information detection module 720 is used for comprising from the subcarrier acquisition of said control resource-area the control information of resource home identity, and control information is sent to resource control module 740.
Resource control module 740; Be used for confirming that according to the resource home identity Resource Block that comprises the resource home identity belongs to specific user terminal; And the generation control command, the business datum in the subcarrier of the data field of the said particular resource block of these control command designation data extraction module 730 receptions.
Control information detection module 720 further obtains resource allocation information from the control resource-area; Resource control module 740 is confirmed a plurality of Resource Block of said specific user terminal according to the combined information of said resource home identity and said resource allocation information; Data extraction module 730 obtains business datum from the subcarrier in the data resource district of a plurality of Resource Block of said user terminal.
In addition, the embodiment of the invention also provides a kind of communication system, and it comprises at least one above-mentioned local side and at least one above-mentioned user terminal.
In one example, this communication system can be a wireless communication system.Fig. 8 shows wireless communication system according to an embodiment of the invention.As shown in Figure 8; Said wireless communication system can comprise at least one base station and at least one subscriber equipment; Wherein, Said base station comprises the device that can be arranged on local side according to the embodiment of the invention, and said subscriber equipment comprise according to the embodiment of the invention can be arranged on user terminal device.
In another example, this communication system can be a wired communication system.Fig. 9 shows wired communication system according to an embodiment of the invention.As shown in Figure 9; Said wired communication system can comprise at least one head end and at least one terminal; Wherein, said head end comprises the device that can be arranged on local side according to the embodiment of the invention, said terminal comprise according to the embodiment of the invention can be arranged on user terminal device.
In addition, through in the fixed position of Resource Block, i.e. controlled area in the Resource Block of supporting business transfer of data, the bearing resource attribute information can also be realized dynamic QoS like the power control information of modulation and/or coding class information, downlink resource piece etc.Specifically, can realize different QoS through modulation system on the dynamic modification subcarrier and coded system, to realize the different error rates.Thereby for low time delay, the business that low rate requires like the VoIP data flow, can be used the modulation system of relative low order and/or lower code check, and to data or video traffic, then can use the modulation system of relative high-order and/or higher code check.
Time division multiple access way and OFDMA mode based on the OFDM modulation are similar, and difference is at a plurality of users' subcarrier identical, is not directed against different user terminal dividing frequency resources, only need distribute time-domain resource.In the multiplexing service data, OFDMA can adopt a plurality of user terminal parallel mapped multiplexing, and the business datum serial between a plurality of user terminals of time division multiple access way of OFDM modulation is multiplexing.
Should be appreciated that above-mentioned " specific " is the meaning of certain or certain type, mainly has been the difference effect, and non-special implication.For example, specific user terminal can be any user terminal in a plurality of user terminals in the multi-address system, and " specific " mainly is the effect that is used to distinguish other user terminal, also can use target terminal user, and certain user terminal substitutes.Particular resource block can be certain or certain type of Resource Block in a plurality of Resource Block, as comprises the Resource Block of data resource district and control resource-area.The business datum of user terminal is meant, is meant the business datum that sends to user terminal at local side to the direction of user terminal, is meant the business datum that user terminal sends at user terminal to the direction of local side.
Each embodiment all adopts the mode of going forward one by one to describe in this specification, and what each embodiment stressed all is and the difference of other embodiment that same or analogous part cross-references gets final product between each embodiment.For device embodiment, because it is similar basically with method embodiment, so description is fairly simple, relevant part gets final product referring to the part explanation of method embodiment.
It should be appreciated by those skilled in the art that the function that is divided into of apparatus module is divided in the embodiment of the invention, actual concrete structure can be the fractionation or the merging of above-mentioned functions module.One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be accomplished through the relevant hardware of program command; Aforesaid program can be stored in the computer read/write memory medium; This program the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
The above is merely preferred embodiment of the present invention, is not to be used to limit protection scope of the present invention.The scheme of the content record of claim also is the protection range of the embodiment of the invention.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (19)
1. sending method, this sending method is applied to the multi-address system based on OFDM, it is characterized in that,
Confirm one or more Resource Block of the business data transmission of support specific user terminal, the particular resource block of said one or more Resource Block comprises control resource-area and data resource district, and each Resource Block comprises the data resource district;
The business datum and the resource home identity of specific user terminal are mapped to said one or more Resource Block to generate the multi-carrier signal through a plurality of subcarrier-modulated, and wherein, said resource home identity is mapped to said control resource-area;
Send said multi-carrier signal.
2. sending method according to claim 1 is characterized in that,
Each Resource Block of said one or more Resource Block comprises the control resource-area, and said resource home identity is mapped to the control resource-area in each Resource Block.
3. sending method according to claim 1 is characterized in that,
Other Resource Block of said particular resource block and at least one forms the Resource Block group; Said control resource-area also is mapped with resource allocation information, and the combined information of said resource home identity and said resource allocation information is represented the attaching relation of interior all Resource Block of said Resource Block group and said specific user terminal.
4. according to each described sending method of claim 1 to 3, it is characterized in that physical label and/or logical identifier that said resource home identity is said specific user terminal.
5. according to each described sending method of claim 1 to 4; It is characterized in that; Said control resource-area is mapped with Resource Properties information, and said resource belongs to information and comprises: modulation and coding class information, and/or the transmission power control information of said one or more Resource Block.
6. method of reseptance, this method of reseptance is applied to the multi-address system based on OFDM, it is characterized in that,
Receive multi-carrier signal through a plurality of subcarrier-modulated, the corresponding a plurality of Resource Block of said a plurality of subcarriers, the particular resource block in said a plurality of Resource Block comprises control resource-area and data resource district;
Detect in the corresponding subcarrier of said particular resource block inner control resource-area and obtain the resource home identity;
Confirm that according to the resource home identity said particular resource block belongs to specific user terminal;
From the corresponding subcarrier in the data resource district of said particular resource block, obtain business datum.
7. method of reseptance according to claim 6 is characterized in that,
Each Resource Block comprises the control resource-area, and the control resource-area in each Resource Block is mapped with the resource home identity.
8. sending method according to claim 6 is characterized in that,
Other Resource Block of said particular resource block and at least one forms the Resource Block group, and said control resource-area also is mapped with resource allocation information;
Confirm all Resource Block in the Resource Block group of said specific user terminal according to the combined information of said resource home identity and said resource allocation information, and obtain business datum from the corresponding subcarrier in data resource district of all Resource Block of said Resource Block group.
9. according to each described sending method of claim 6 to 8, it is characterized in that physical label and/or logical identifier that said resource home identity is said specific user terminal.
10. according to each described sending method of claim 6 to 9, it is characterized in that said control resource-area is mapped with Resource Properties information, said resource belongs to information and comprises; The transmission power control information of modulation and coding class information and/or said one or more Resource Block.
11. a device, this device is applied to the multi-address system based on OFDM, it is characterized in that,
Resource control module (630); Be used for confirming to support one or more Resource Block of specific user terminal business data transmission; Generate control command, the control information that this control command indication will comprise the resource home identity is mapped to the particular resource block of said one or more Resource Block;
Signal generation module (610); Be used to respond said control command; The control information that will comprise the resource home identity is mapped to the control resource-area in the said particular resource block; And the data resource district in said one or more Resource Block shines upon the business datum of said specific user terminal, exports in said at least one or a plurality of Resource Block multi-carrier signal through multi-carrier modulation;
Sending module (650) is used for the multi-carrier signal of mapping block (610) output is sent.
12. device according to claim 11; It is characterized in that; Said control information also comprises resource allocation information; The combined information of said resource home identity and said resource allocation information is used for the attaching relation of identifying resource piece group and said user terminal, and said Resource Block group comprises said particular resource block and at least one other Resource Block.
13. device according to claim 11 is characterized in that, physical label and/or logical identifier that said resource home identity is a user terminal.
14., it is characterized in that signal generation module (610) comprising according to each described device of claim 11 to 13:
Digital coding and modulation module (612) are used for business datum is encoded and modulated, and export in the data resource district of said one or more Resource Block the multi-carrier signal through a plurality of subcarrier-modulated;
Control information coding and modulation module (614) are used to obtain comprising the control information of resource home identity, and control information is modulated and encoded, and output is mapped in the control resource-area of said particular resource block the multi-carrier signal through a plurality of subcarrier-modulated;
Multiplexing module (616) is used for the subcarrier multiplex with digital coding and modulation module (612) and control information coding and modulation module (614) output.
15. a device is applied to the receiving terminal based on the multi-address system of OFDM, it is characterized in that, this device comprises:
Receiver module (710) is used to receive the multi-carrier signal through a plurality of subcarrier-modulated, the corresponding a plurality of Resource Block of said a plurality of subcarriers, and the particular resource block in said a plurality of Resource Block comprises control resource-area and data resource district;
Control information detection module (720) is used for comprising from the subcarrier acquisition of said control resource-area the control information of resource home identity, and control information is sent to resource control module (740);
Resource control module (740); Be used for confirming that according to the resource home identity said particular resource block belongs to specific user terminal; And the generation control command, the business datum in the subcarrier of the data field correspondence of the said particular resource block of this control command designation data extraction module (730) reception;
Data extraction module 730 is used for the indication according to resource control module 740, from the corresponding subcarrier in the data field of said particular resource block, obtains business datum.
16. device according to claim 15 is characterized in that,
Control information detection module (720) further obtains resource allocation information from said control resource-area;
Resource control module (740) is confirmed a plurality of Resource Block of said specific user terminal according to the combined information of said resource home identity and said resource allocation information;
Corresponding subcarrier obtains business datum to data extraction module 730 from the data resource district of a plurality of Resource Block of said user terminal.
17., it is characterized in that physical label and/or logical identifier that said resource home identity is said specific user terminal according to claim 15 or 16 described devices.
18. according to each described device of claim 15 to 17, it is characterized in that said control information also comprises Resource Properties information, said Resource Properties information comprises: modulation and coding class information and/or Resource Block transmission power control information.
19. the multi-address system based on OFDM, comprise be arranged at local side as claim according to claim 11 to 14 each device and like each device of claim 15 to 18.
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