CN103428141A - Method and device for sending and receiving carrier aggregation - Google Patents
Method and device for sending and receiving carrier aggregation Download PDFInfo
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Abstract
The invention provides a method and device for sending and receiving carrier aggregation. The method for sending the carrier aggregation includes the steps that carrier aggregation sending treatment is performed on data to be sent, and obtained orthogonal frequency division multiplexing (OFDM) symbols are sent out on an aggregation frequency band; the aggregation frequency band is formed by N serial single carrier system physical layer basic transmission bandwidths in an aggregation mode, and N is a real number which is lager than one; in a carrier aggregation system transmitter, frequency which is N times that of all clocks in a corresponding single carrier system transmitter is adopted for all clocks; the conversion point number adopted for inverse fast Fourier transform (IFFT) is the same as that of the IFFT in the single carrier system transmitter. The method for receiving the carrier aggregation corresponds to the method for sending the carrier aggregation, and performs inverse treatment. Therefore, the bandwidths can be broadened, besides, the processing complexity of digital baseband signals can not be increased, and requirements for hardware can not be improved.
Description
Technical Field
The invention belongs to the field of mobile communication, and particularly relates to a method and a device for transmitting and receiving carrier aggregation.
Background
Carrier aggregation is one of the key technologies of the 4G mobile communication system and the 802.11ac system. In the carrier aggregation techniques of all the current systems, the same characteristics are found in that: the number of subcarriers increases with increasing aggregated carriers.
Taking LTE-Advanced system as an example, when component carriers use 20MHz as a basic bandwidth, each component carrier has 1200 effective subcarriers, and the FFT adopts 2048-point fast fourier transform. If 2 component carriers are aggregated, the system bandwidth can reach 40MHz, 4096-point fast Fourier transform is needed for FFT; if 4 component carriers are aggregated, the system bandwidth can reach 80MHz, and 8192-point fast Fourier transform is needed for FFT.
The most fundamental Nyquist theorem among the communication principles proves that: the minimum rate of undistorted sampling of a signal is 2 times its signal bandwidth. If the signal bandwidth is 20MHz, the distortion-free minimum sampling rate is 40 MHz. In a spectrum aggregation system, especially continuous spectrum aggregation, the larger the signal bandwidth, the higher the baseband sampling rate. In an Orthogonal Frequency Division Multiplexing (OFDM) system, the larger the signal bandwidth, the higher the sampling rate, the larger the number of samples in each OFDM symbol, and the more complex the signal processing.
While fast fourier transforms are no longer a technical bottleneck for modern microelectronics, massive fourier transforms undoubtedly bring about an increase in chip area, power consumption, cost or processing delay.
For future mobile communication or wireless access systems, only two options are available for improving the capacity of an air interface: (1) the spectrum efficiency is improved, namely: number of bits that can be carried per Hz; (2) increasing the spectral bandwidth. The first option is limited to the aroma theory. With the advent of Turbo and LDPC coding, engineers have increasingly approached the capacity limit of the aroma theory. The MIMO technology developed by scientists such as Forschini and teltar can utilize a space independent parallel channel to greatly improve the spectrum efficiency of a system, but in practical application, the MIMO technology not only strongly depends on a wireless channel, but also brings great invariance to engineering design. Therefore, both 4G mobile communication systems and 802.11ac increase the spectrum bandwidth as an important approach to increase the capacity of air interfaces.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a transmission and reception method and apparatus for carrier aggregation, which can not only extend bandwidth, but also not increase processing complexity of digital baseband signals, and not increase requirements for hardware.
The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview and is intended to neither identify key or critical elements nor delineate the scope of such embodiments. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is presented later.
In order to solve the above technical problem, the present invention provides a method for transmitting carrier aggregation, including:
carrying out carrier aggregation sending processing on data to be sent, and sending out the obtained OFDM symbols on an aggregation frequency band; wherein,
the aggregation frequency band is formed by aggregating basic transmission bandwidths of continuous N single carrier system physical layers, wherein N is a real number larger than 1;
each clock in the carrier aggregation system transmitter adopts N times of frequency of each clock in the corresponding single carrier system transmitter;
the number of transform points of Inverse Fast Fourier Transform (IFFT) is the same as that of IFFT in a single carrier system transmitter.
Preferably, when performing the transmission processing, keeping the OFDM symbol index position occupied by each channel in the time domain unchanged; and/or keeping the index position of the OFDM subcarrier occupied by each channel in the frequency domain unchanged.
In order to solve the above technical problem, the present invention further provides a transmission apparatus for carrier aggregation, including:
the processing module is used for sending data to be sent to obtain an OFDM symbol; the processing module is provided with a plurality of clocks, and each clock frequency is N times of each clock frequency in the processing module of the corresponding single carrier system; the number of IFFT conversion points adopted during the transmission processing is the same as that of the IFFT conversion points in a transmission processing module of a single carrier system;
a sending module, connected to the processing module, for sending the OFDM symbol on an aggregation band; the aggregation frequency band is formed by aggregating basic transmission bandwidths of continuous N single carrier system physical layers; n is a real number greater than 1.
Preferably, the processing module keeps the OFDM symbol index position occupied by each channel in the time domain unchanged during the transmission processing; and/or keeping the index position of the OFDM subcarrier occupied by each channel in the frequency domain unchanged.
Preferably, N is an integer.
In order to solve the above technical problem, the present invention further provides a carrier aggregation receiving method, including:
receiving carrier signals on an aggregation frequency band, and receiving the received carrier signals; wherein,
the aggregation frequency band is formed by aggregating basic transmission bandwidths of continuous N single carrier system physical layers, wherein N is a real number larger than 1;
each clock in the carrier aggregation system receiver adopts N times of frequency of each clock in the corresponding single carrier system receiver;
the number of transform points of a Fast Fourier Transform (FFT) employed in the carrier aggregation system receiver is the same as the number of transform points of an FFT in a single carrier system receiver.
Preferably, when performing the receiving process, keeping the OFDM symbol index position occupied by each channel in the time domain unchanged; and/or keeping the index position of the OFDM subcarrier occupied by each channel in the frequency domain unchanged.
In order to solve the above technical problem, the present invention further provides a receiving apparatus for carrier aggregation, including:
a receiving module for receiving a carrier signal on an aggregated frequency band; the aggregation frequency band is formed by aggregating basic transmission bandwidths of continuous N single carrier system physical layers; n is a real number greater than 1;
the processing module is connected with the receiving module and used for receiving and processing the received carrier signal; the processing module is provided with a plurality of clocks, and each clock frequency is N times of each clock frequency in the processing module of the single carrier system; the number of FFT transform points used in the reception processing is the same as the number of FFT transform points in the reception processing module of the single carrier system.
Preferably, the processing module keeps the OFDM symbol index position occupied by each channel in the time domain unchanged during the receiving process; and/or keeping the index position of the OFDM subcarrier occupied by each channel in the frequency domain unchanged.
Preferably, N is an integer.
For the purposes of the foregoing and related ends, the one or more embodiments include the features hereinafter fully described and particularly pointed out in the claims. The following description and the annexed drawings set forth in detail certain illustrative aspects and are indicative of but a few of the various ways in which the principles of the various embodiments may be employed. Other benefits and novel features will become apparent from the following detailed description when considered in conjunction with the drawings and the disclosed embodiments are intended to include all such aspects and their equivalents.
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Fig. 1 is a flowchart of a method for transmitting spectrum aggregation according to an embodiment of the present invention;
fig. 2 is a flowchart of a receiving method of spectrum aggregation according to an embodiment of the present invention;
fig. 3 is a block diagram of a transmitting apparatus for spectrum aggregation according to an embodiment of the present invention;
fig. 4 is a block diagram of a receiving apparatus for spectrum aggregation according to an embodiment of the present invention.
Detailed Description
The following description and the drawings sufficiently illustrate specific embodiments of the invention to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. The scope of embodiments of the invention encompasses the full ambit of the claims, as well as all available equivalents of the claims. Embodiments of the invention may be referred to herein, individually or collectively, by the term "invention" merely for convenience and without intending to voluntarily limit the scope of this application to any single invention or inventive concept if more than one is in fact disclosed.
The present invention proceeds from the most basic concept of OFDM systems, where the OFDM subcarrier spacing should be much smaller than the channel correlation bandwidth to ensure that each subcarrier experiences flat fading in the wireless channel. However, the indoor channel correlation bandwidth is significantly larger than the outdoor mobile channel. Therefore, on the premise of meeting the requirement of high-rate transmission in an indoor environment, the following carrier aggregation scheme is proposed.
The solution of spectrum aggregation in the embodiment of the present invention is applicable to various multicarrier systems such as an LTE system, an EUHT system, an 802.11a system, an 802.11g system, an 802.11n system, and an 802.11ac system. From the perspective of the data transmission direction, the spectrum aggregation scheme provided by the embodiment of the invention is suitable for both uplink transmission and downlink transmission. For downlink transmission, a sending end is a base station, and a receiving end is a terminal; for uplink transmission, the transmitting end is a terminal, and the receiving end is a base station.
The spectrum aggregation scheme of the present invention will be described below from two perspectives, transmission and reception, respectively. The aggregation frequency band is formed by aggregating basic transmission bandwidths of continuous N single carrier system physical layers, wherein N is a real number larger than 1. In the single carrier system, one end for data transmission is referred to as a single carrier system transmitter, and one end for data reception is referred to as a single carrier system receiver. Under the carrier aggregation system, one end for data transmission is called a carrier aggregation system transmitter, and one end for data reception is called a carrier aggregation system receiver.
Referring to fig. 1, the diagram shows a method for sending spectrum aggregation according to an embodiment of the present invention, including the steps of:
step S101: carrying out carrier aggregation sending processing on data to be sent;
step S102: and sending the obtained OFDM symbols on the aggregation frequency band.
Wherein, each clock in the carrier aggregation system transmitter adopts N times frequency of each clock in the corresponding single carrier system transmitter; the number of IFFT transformation points is the same as that of IFFT in the single carrier system transmitter.
Wherein different systems have different transmission processing contents, for example, some systems have coding, modulation and IFFT processing; some systems may also have MIMO processing, stream parsing and mapping processing, interleaving processing, etc. The embodiment of the invention does not change the content of the sending processing of the original system, only adjusts the configuration information during the sending processing, expands the bandwidth by keeping the point number of the OFDM symbol unchanged and improving the baseband processing rate, does not increase any complexity in the digital baseband signal processing, does not improve the requirement on hardware, can reduce the complexity of signal processing, reduces the chip area and the system processing delay and reduces the chip cost when the signal transmitting bandwidth is increased and the large-bandwidth transmission is carried out compared with the carrier aggregation of other systems.
After the frequency spectrum aggregation sending method is adopted for processing, the subcarrier interval is changed into N times of the original frequency spectrum aggregation sending method, and the OFDM symbol period is changed into 1/N of the original frequency spectrum aggregation sending method; the OFDM symbol comprises a CP part and a data part, and the period of the 2 parts is changed to be 1/N of the original period.
The following describes a spectrum aggregation transmission method according to the present invention, with respect to an LTE system, with N =2 and N =4 being selected. Regarding the value of N, those skilled in the art may select a real number with a fractional part different from 0, for example, N =1.5, without being limited to an integer, and also can solve the technical problem and achieve the corresponding technical effect.
Taking an LTE system as an example, the LTE subcarrier spacing is 15KHz, for a 20MHz LTE system, 2048 samples are shared by OFDM symbols, the baseband processing rate is 30.72MHz, the IFFT transform window length is 66.7us, 128 samples are shared by CP, and the period is 4.7 us. By adopting the frequency spectrum aggregation sending method, for an LTE system with 40MHz, the baseband processing rate is improved to 61.44MHz, each OFDM symbol still keeps 2048 sampling points, the IFFT conversion window length is reduced to 33.33us, the CP still keeps 128 sampling points, the period is reduced to 2.0833us, the subcarrier interval is widened by 1 time and becomes 30 KHz. After spectrum spreading, the peak rate of the physical layer of each carrier wave is doubled without any increase in complexity.
Taking an LTE system as an example, by using the method for transmitting spectrum aggregation of the present invention, for an 80MHz LTE system, the baseband processing rate is increased to 122.88MHz, each OFDM symbol still maintains 2048 samples, the IFFT transformation window is reduced to 16.67us, the CP still maintains 128 samples, the period is reduced to 1.042us, the subcarrier spacing is widened by 3 times, and becomes 60 KHz. After spectral spreading, the peak physical layer rate per carrier is quadrupled without any increase in complexity.
Next, a transmission method of spectrum aggregation according to the present invention will be described with respect to the EUHT system, with N =2 and N =4 being selected. Also, regarding the value of N, those skilled in the art may select a real number having a fractional part of not 0, for example, N =1.5, as necessary without being limited to an integer.
For the EUHT system, simple spectrum aggregation can be achieved with exactly the same method, achieving high peak rates. The basic bandwidth of the EUHT system is 20MHz, the subcarrier spacing is 78.125KHz, the IFFT conversion window is 12.8us, the total number of 256 sampling points is, the CP is 1.6us, and the total number of 32 sampling points is. By adopting the method for transmitting the frequency spectrum aggregation, the processing rate of a baseband is improved by 1 time for a 40MHz EUHT system, the IFFT window length still keeps 256 sampling points, the OFDM symbol period is reduced to 6.4us, the CP still keeps 32 sampling points, the period is reduced to 0.8us, the subcarrier interval is widened by 1 time and becomes 156.25 KHz. After spectrum spreading, the peak rate of the physical layer is doubled without any increase in complexity.
For an EUHT system of 80MHz, each OFDM symbol keeps 256 sampling points unchanged, the OFDM symbol period is reduced to 3.2us, the CP still keeps 32 sampling points, the period is reduced to 0.4us, the subcarrier spacing is widened by 3 times and becomes 312.5 KHz. After spectral spreading, the physical layer peak rate is quadrupled without any increase in complexity.
In the baseband processing, the method further comprises the step of forming the OFDM symbols into a transmission frame, wherein the transmission frame comprises a plurality of channels. Preferably, when the transmission frame is composed of OFDM symbols, the OFDM symbol index position occupied by each channel in the time domain is kept unchanged; and/or keeping the index position of the OFDM subcarrier occupied by each channel in the frequency domain unchanged. Thus, the backward compatibility is complete, and the digital baseband part of the transmitting end does not need any modification or upgrading.
From a business development perspective, large data volume traffic basically occurs in indoor or low-speed environments. The inherent channel differences between indoor wireless access and outdoor mobile communication make the two system optimization designs different. The technical scheme of the invention is based on the assumption and an outdoor system, and considers how to improve the air interface capacity of the indoor system through carrier aggregation so as to adapt to the large data transmission requirements of indoor high-definition video, blue-ray DVD and the like in the future, and simultaneously ensures the signal processing common mode of the indoor and outdoor systems, does not change the basic architecture of the outdoor mobile communication system, reduces the complexity of equipment, and avoids the increase of the signal processing complexity by the existing carrier aggregation technology.
Correspondingly, an embodiment of the present invention further provides a receiving method of spectrum aggregation, which is used in cooperation with the sending method of spectrum aggregation to perform reverse processing on data sent by using the spectrum aggregation method, as shown in fig. 2, and includes the steps of:
step S201: receiving a carrier signal on an aggregated frequency band;
step S202: and carrying out receiving processing on the received carrier signal.
Wherein, each clock in the carrier aggregation system receiver adopts N times of frequency of each clock in the corresponding single carrier system receiver; the number of the FFT conversion points is the same as that of the FFT in the single carrier system receiver.
The baseband processing on the receiving end side is reverse processing corresponding to the baseband processing on the transmitting end side, and different systems have different baseband processing contents. The embodiment of the invention does not change the content of the receiving processing of the original system, only adjusts the configuration information during the receiving processing, and performs the reverse processing by keeping the number of points of the OFDM symbols unchanged and improving the processing rate in a way of matching with the sending method, the digital baseband signal processing does not increase any complexity, does not improve the requirement on hardware, and can reduce the complexity of signal processing, reduce the chip area and the system processing delay and reduce the chip cost when the signal transmission bandwidth is increased compared with the carrier aggregation of other systems while the signal transmission bandwidth is increased.
Correspondingly, after the receiving method of the frequency spectrum aggregation is adopted, the OFDM symbol period is changed to be 1/N of the original period, and the subcarrier interval is changed to be N times of the original period. The OFDM symbol comprises a CP part and a data part, and the period of the 2 parts is changed to be 1/N of the original period.
Taking the LTE system as an example, the LTE subcarrier spacing is 15KHz, for the LTE system with 20MHz, the OFDM symbols have 2048 samples, the sampling rate is 30.72MHz, the FFT conversion window length is 66.7us, the CP has 128 samples, and the period is 4.7 us. By adopting the receiving method of the carrier aggregation, for the LTE system of 40MHz, the sampling rate is improved to 61.44MHz, each OFDM symbol still keeps 2048 sampling points, the length of an FFT conversion window is reduced to 33.33us, a CP still keeps 128 sampling points, the period is reduced to 2.0833us, the interval of subcarriers is widened by 1 time, and the sampling rate is changed to 30 KHz. After spectrum spreading, the peak rate of the physical layer of each carrier wave is doubled without any increase in complexity.
Taking an LTE system as an example, by using the carrier aggregation transmission method of the present invention, for an 80MHz LTE system, the sampling rate is increased to 122.88MHz, each OFDM symbol still maintains 2048 samples, the FFT conversion window is reduced to 16.67us, the CP still maintains 128 samples, the period is reduced to 1.042us, the subcarrier spacing is widened by 3 times, and becomes 60 KHz. After spectral spreading, the peak physical layer rate per carrier is quadrupled without any increase in complexity.
For the EUHT system, simple spectrum aggregation can be achieved with exactly the same method, achieving high peak rates. The basic bandwidth of the EUHT system is 20MHz, the subcarrier spacing is 78.125KHz, the FFT conversion window is 12.8us, the total number of 256 sampling points is, the CP is 1.6us, and the total number of 32 sampling points is. By adopting the carrier aggregation sending method, for a 40MHz EUHT system, the sampling rate is improved by 1 time, the length of an FFT window still keeps 256 sampling points, the OFDM symbol period is reduced to 6.4us, the CP still keeps 32 sampling points, the period is reduced to 0.8us, the subcarrier interval is widened by 1 time and becomes 156.25 KHz. After spectrum spreading, the peak rate of the physical layer is doubled without any increase in complexity.
For an EUHT system of 80MHz, the sampling rate is improved by 1 time, the length of an FFT window still keeps 256 sampling points, the period of an OFDM symbol is reduced to 3.2us, the period of a CP still keeps 32 sampling points, the period is reduced to 0.4us, the interval of subcarriers is widened by 3 times and becomes 312.5 KHz. After spectral spreading, the physical layer peak rate is quadrupled without any increase in complexity.
If the sending end carries out baseband processing, keeping a time domain frame structure and each channel structure unchanged; and/or, keeping the frequency domain subcarrier structure and each channel structure unchanged, and correspondingly, the receiving end carries out analysis processing according to the original frame structure and the channel structure, so that the receiving end is completely backward compatible, and the digital baseband part of the receiving end does not need any modification or upgrading.
In order to implement the above method for transmitting carrier aggregation, an embodiment of the present invention further provides a transmitting apparatus for carrier aggregation, as shown in fig. 3, including:
a processing module 301, configured to perform sending processing on data to be sent, so as to obtain an OFDM symbol; the processing module 301 has a plurality of clocks, and each clock frequency is N times of each clock frequency in the processing module 301 of the corresponding single carrier system; the number of IFFT conversion points in inverse fast fourier transform IFFT employed in transmission processing is the same as that in the transmission processing module 301 of the single carrier system;
a sending module 302, connected to the processing module 301, configured to send the OFDM symbol on an aggregation frequency band; the aggregation frequency band is formed by aggregating basic transmission bandwidths of continuous N single carrier system physical layers; n is a real number greater than 1.
Preferably, the processing module 301 keeps the OFDM symbol index position occupied by each channel in the time domain unchanged during the transmission processing; and/or keeping the index position of the OFDM subcarrier occupied by each channel in the frequency domain unchanged.
In order to implement the above sending method of carrier aggregation, an embodiment of the present invention further provides a receiving apparatus of carrier aggregation, as shown in fig. 4, including
A receiving module 401, configured to receive a carrier signal on an aggregated frequency band; the aggregation frequency band is formed by aggregating basic transmission bandwidths of continuous N single carrier system physical layers; n is a real number greater than 1;
a processing module 402, connected to the receiving module 401, configured to perform receiving processing on a received carrier signal; the processing module 402 has a plurality of clocks, each clock frequency is N times of each clock frequency in the processing module 402 of the single carrier system; the number of FFT transform points used in the reception processing is the same as the number of FFT transform points in the reception processing module 402 of the single carrier system.
Preferably, the processing module 402 keeps the OFDM symbol index position occupied by each channel in the time domain unchanged during the receiving process; and/or keeping the index position of the OFDM subcarrier occupied by each channel in the frequency domain unchanged.
Unless specifically stated otherwise, terms such as processing, computing, calculating, determining, displaying, or the like, may refer to an action and/or process of one or more processing or computing systems or similar devices that manipulates and transforms data represented as physical (e.g., electronic) quantities within the processing system's registers and memories into other data similarly represented as physical quantities within the processing system's memories, registers or other such information storage, transmission or display devices. Information and signals may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.
It should be understood that the specific order or hierarchy of steps in the processes disclosed is an example of exemplary approaches. Based upon design preferences, it is understood that the specific order or hierarchy of steps in the processes may be rearranged without departing from the scope of the present disclosure. The accompanying method claims present elements of the various steps in a sample order, and are not intended to be limited to the specific order or hierarchy presented.
In the foregoing detailed description, various features are grouped together in a single embodiment for the purpose of streamlining the disclosure. This method of disclosure is not to be interpreted as reflecting an intention that the claimed embodiments of the subject matter require more features than are expressly recited in each claim. Rather, as the following claims reflect, invention lies in less than all features of a single disclosed embodiment. Thus, the following claims are hereby expressly incorporated into the detailed description, with each claim standing on its own as a separate preferred embodiment of the invention.
Those of skill would further appreciate that the various illustrative logical blocks, modules, circuits, and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both. To clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the overall system. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present disclosure.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. Of course, the storage medium may also be integral to the processor. The processor and the storage medium may reside in an ASIC. The ASIC may reside in a user terminal. Of course, the processor and the storage medium may reside as discrete components in a user terminal.
For a software implementation, the techniques described herein may be implemented with modules (e.g., procedures, functions, and so on) that perform the functions described herein. The software codes may be stored in memory units and executed by processors. The memory unit may be implemented within the processor or external to the processor, in which case it can be communicatively coupled to the processor via various means as is known in the art.
What has been described above includes examples of one or more embodiments. It is, of course, not possible to describe every conceivable combination of components or methodologies for purposes of describing the aforementioned embodiments, but one of ordinary skill in the art may recognize that many further combinations and permutations of various embodiments are possible. Accordingly, the embodiments described herein are intended to embrace all such alterations, modifications and variations that fall within the scope of the appended claims. Furthermore, to the extent that the term "includes" is used in either the detailed description or the claims, such term is intended to be inclusive in a manner similar to the term "comprising" as "comprising" is interpreted when employed as a transitional word in a claim. Furthermore, any use of the term "or" in the specification of the claims is intended to mean a "non-exclusive or".
Claims (10)
1. A method for transmitting carrier aggregation, comprising:
carrying out carrier aggregation sending processing on data to be sent, and sending out the obtained orthogonal frequency division multiplexing OFDM symbols on an aggregation frequency band; wherein,
the aggregation frequency band is formed by aggregating basic transmission bandwidths of continuous N single carrier system physical layers, wherein N is a real number larger than 1;
each clock in the carrier aggregation system transmitter adopts N times of frequency of each clock in the corresponding single carrier system transmitter;
the number of transform points of the inverse fast fourier transform IFFT is the same as that of the IFFT in the single carrier system transmitter.
2. The transmission method of claim 1, wherein:
when the transmission processing is carried out, keeping the OFDM symbol index position occupied by each channel in the time domain unchanged; and/or keeping the index position of the OFDM subcarrier occupied by each channel in the frequency domain unchanged.
3. A transmission apparatus for carrier aggregation, comprising:
the processing module is used for sending data to be sent to obtain an Orthogonal Frequency Division Multiplexing (OFDM) symbol; the processing module is provided with a plurality of clocks, and each clock frequency is N times of each clock frequency in the processing module of the corresponding single carrier system; the number of the IFFT conversion points adopted in the transmission processing is the same as that of the IFFT conversion points in a transmission processing module of a single carrier system;
a sending module, connected to the processing module, for sending the OFDM symbol on an aggregation band; the aggregation frequency band is formed by aggregating basic transmission bandwidths of continuous N single carrier system physical layers; n is a real number greater than 1.
4. A transmission apparatus according to claim 3, characterized in that:
the processing module keeps the OFDM symbol index position occupied by each channel in the time domain unchanged when transmitting; and/or keeping the index position of the OFDM subcarrier occupied by each channel in the frequency domain unchanged.
5. The transmission apparatus according to claim 3 or 4, wherein N is an integer.
6. A carrier aggregation receiving method, comprising:
receiving carrier signals on an aggregation frequency band, and receiving the received carrier signals; wherein,
the aggregation frequency band is formed by aggregating basic transmission bandwidths of continuous N single carrier system physical layers, wherein N is a real number larger than 1;
each clock in the carrier aggregation system receiver adopts N times of frequency of each clock in the corresponding single carrier system receiver;
the number of the FFT conversion points of the fast Fourier transform is the same as that of the FFT in the single carrier system receiver.
7. A receiving method as claimed in claim 6, characterized in that:
when receiving processing is carried out, keeping the index position of the orthogonal frequency division multiplexing OFDM symbol occupied by each channel in the time domain unchanged; and/or keeping the index position of the OFDM subcarrier occupied by each channel in the frequency domain unchanged.
8. A receiving apparatus for carrier aggregation, comprising:
a receiving module for receiving a carrier signal on an aggregated frequency band; the aggregation frequency band is formed by aggregating basic transmission bandwidths of continuous N single carrier system physical layers; n is a real number greater than 1;
the processing module is connected with the receiving module and used for receiving and processing the received carrier signal; the processing module is provided with a plurality of clocks, and each clock frequency is N times of each clock frequency in the processing module of the single carrier system; the number of FFT points used in the receiving process is the same as that of FFT points in a receiving process module of a single carrier system.
9. The receiving device of claim 8, wherein:
the processing module keeps the OFDM symbol index position occupied by each channel in the time domain unchanged during receiving processing; and/or keeping the index position of the OFDM subcarrier occupied by each channel in the frequency domain unchanged.
10. The transmission apparatus according to claim 8 or 9, wherein N is an integer.
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| CN2012101569345A CN103428141A (en) | 2012-05-18 | 2012-05-18 | Method and device for sending and receiving carrier aggregation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119449256A (en) * | 2024-10-28 | 2025-02-14 | 中国星网网络应用有限公司 | Carrier aggregation method, device, communication equipment, storage medium and program product |
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| CN101282160A (en) * | 2007-04-03 | 2008-10-08 | 中兴通讯股份有限公司 | Method for collocating OFDM system |
| US20100098012A1 (en) * | 2008-10-20 | 2010-04-22 | Interdigital Patent Holdings, Inc. | Uplink control information transmission methods for carrier aggregation |
| CN102100103A (en) * | 2008-06-19 | 2011-06-15 | 华为技术有限公司 | Improved method and apparatus for carrier aggregation in radio communication system |
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| CN101282160A (en) * | 2007-04-03 | 2008-10-08 | 中兴通讯股份有限公司 | Method for collocating OFDM system |
| CN102100103A (en) * | 2008-06-19 | 2011-06-15 | 华为技术有限公司 | Improved method and apparatus for carrier aggregation in radio communication system |
| US20100098012A1 (en) * | 2008-10-20 | 2010-04-22 | Interdigital Patent Holdings, Inc. | Uplink control information transmission methods for carrier aggregation |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN119449256A (en) * | 2024-10-28 | 2025-02-14 | 中国星网网络应用有限公司 | Carrier aggregation method, device, communication equipment, storage medium and program product |
| CN119449256B (en) * | 2024-10-28 | 2025-09-09 | 中国星网网络应用有限公司 | Carrier aggregation method, carrier aggregation device, communication apparatus, storage medium, and program product |
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