CN111699660B - Method and device for determining length of cyclic prefix - Google Patents
Method and device for determining length of cyclic prefix Download PDFInfo
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Abstract
A method and a device for determining the length of a cyclic prefix are used for solving the problem that the spectrum utilization rate of a system is low due to the use of a normal cyclic prefix (normal CP) and an extended CP in the prior art. The method comprises the following steps: the method comprises the steps that a first device receives a reference signal sent by a second device and determines channel quality information based on the reference signal; the first device determines the CP length corresponding to the channel quality information according to the stored corresponding relation between the plurality of channel quality information and the plurality of CP lengths of the cyclic prefix, wherein the CP length is smaller than the length of the normal CP; the first device sends the CP length to the second device. Therefore, the appropriate CP length can be selected according to the channel quality information, and the selected CP length is smaller than the normal CP length in the prior art, so that compared with the prior art, useless data in the transmission process is reduced, and the spectrum utilization rate of the system can be improved.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a method and an apparatus for determining a Cyclic Prefix (CP) length.
Background
In a Long Term Evolution (LTE) communication system, an Orthogonal Frequency Division Multiplexing (OFDM) modulation scheme is generally used. Specifically, in the transmission process of an OFDM Symbol, in order to eliminate Inter Symbol Interference (ISI) and Inter Carrier Interference (ICI), a transmitting end copies a last part of data of an OFDM Symbol with a certain length and inserts the copied part of data into a front end of the OFDM Symbol, where the inserted part of data is called a CP, and then the transmitting end uses the data, into which the CP is inserted, that is lengthened as a new OFDM Symbol and transmits the new OFDM Symbol to a receiving end; and after receiving the new OFDM symbol, the receiving end demodulates the original OFDM symbol.
Currently, in order to adapt to different cell radii, two fixed CPs, namely, a normal (normal) CP and an extended (extended) CP, are defined in the standard of the LTE system, so that a transmitting end performs modulation based on the length of the normal CP or the extended CP, and a receiving end performs demodulation based on the length of the normal CP or the extended CP. However, since the CP does not carry any useful information, the length of the existing normal CP and extended CP is relatively long, which results in a low spectrum utilization of the communication system.
Disclosure of Invention
The embodiment of the application provides a method and a device for determining a CP length, which are used for solving the problem that the frequency spectrum utilization rate of a communication system is low due to the use of a normal CP and an extended CP in the prior art.
In a first aspect, the present application provides a CP length determining method, including:
the method comprises the steps that a first device receives a reference signal sent by a second device and determines channel quality information based on the reference signal; the first device determines the CP length corresponding to the channel quality information according to the stored corresponding relation between the plurality of channel quality information and the plurality of CP lengths of the cyclic prefix, and sends the CP length to the second device; the CP length is smaller than that of the conventional normal CP; the channel quality information is used for characterizing the channel quality between the first device and the second device; the first device is any one of a terminal device and a base station, and the second device is one of the terminal device and the base station except the first device.
By the method, the appropriate CP length can be selected according to the channel quality information, and the selected CP length is smaller than the normal CP length in the prior art, so that compared with the prior art, useless data in the transmission process is reduced, and the spectrum utilization rate of a communication system can be improved.
In one possible design, the correspondence is generated based on a plurality of channel quality information samples and a plurality of CP length samples. This allows the pair relationship to be accurately obtained.
In one possible design, when the correspondence is generated according to the plurality of channel quality information samples and the plurality of CP length samples, machine learning training may be performed on the plurality of channel quality information samples and the plurality of CP length samples to generate the correspondence. This makes it possible to accurately generate the correspondence relationship.
In one possible design, the correspondence relationship includes a correspondence relationship between first channel quality information and a first CP length, where the first channel quality information is one of the multiple channel quality information samples, and the first CP length is one of the multiple CP length samples; the correspondence between the first channel quality information and the first CP length satisfies the following condition: the difference between the first data and the second data is within a set difference range; the second data is obtained by demodulating first intermediate data according to the first CP length, and the first intermediate data is obtained by modulating the first data based on the first channel quality information and the first CP length. Specifically, the first intermediate data is obtained by modulating the first data based on the first channel quality information and the first CP length, and adding channel distortion and noise to the first data based on the first channel quality information and the first CP length to perform processing.
By the method, the corresponding relation can be accurately obtained, so that the first equipment selects the proper CP length according to the determined channel quality information.
In one possible design, the first data and the second data may each be composed of a plurality of bits, and the number of bits of the first data and the second data is the same. The difference between the first data and the second data may be obtained by: comparing values corresponding to the same bits in the first data and the second data, and processing a difference value obtained by comparing the values corresponding to all the bits into a target value, wherein the target value can be used as a difference between the first data and the second data. The set difference range may be a set numerical range. The method for processing the difference value obtained by comparing the values corresponding to all the bits into the target value may be, but is not limited to, a mean square method, a sum-of-mean square method, a least square method, and the like.
By the method, whether the difference between the first data and the second data is within the set difference range can be accurately judged.
In a possible design, in the process of generating the correspondence relationship according to the plurality of channel quality information samples and the plurality of CP length samples, the first intermediate data may be obtained by modulating, by the first device, first data based on the first channel quality information and the first CP length, where the first data may be randomly selected by the first device; the first intermediate data may also be sent to the first device after the second device modulates first data based on the first channel quality information and the first CP length, where the first data may be agreed between the second device and the first device.
By the method, the first device can accurately obtain the corresponding relation between the first channel quality information and the first CP length.
In one possible design, the first device generates the correspondence, or the first device receives the correspondence from the second device. Wherein the corresponding relationship received by the first device from the second device is generated for the second device.
By the method, the first device can obtain the corresponding relation in two ways, so that the success rate of storing the corresponding relation by the first device can be ensured, and the first device can select the proper CP length through the determined channel quality information.
In one possible design, before the first device receives the reference signal sent by the second device, the first device sends first indication information to the second device, where the first indication information indicates that the first device has the capability of selecting different CP lengths; and the first device receives second indication information of the second device, wherein the second indication information indicates that the second device has the capability of transmitting data according to different CP lengths.
By the method, the first device and the second device can both know that both can support different CP lengths to transmit data, so that the first device can determine the appropriate CP length required in the data transmission process, so that the CP length is adopted in the subsequent data transmission process with the second device, and the spectrum utilization rate of the system can be further improved.
In one possible design, when the first device is a terminal device and the second device is a base station, the first device directly sends the first indication information to the second device; the first device receives the second indication information broadcasted by the second device, or the first device receives the second indication information directly sent to the first device by the second device.
In one possible design, the first device determines a CP demodulation template corresponding to the CP length, where the CP demodulation template is used to indicate a demodulation parameter corresponding to the CP length; and when the first equipment receives the data sent by the second equipment based on the CP length, the first equipment demodulates the data according to the CP demodulation template.
By the method, the first device can accurately demodulate the required data from the data sent by the second device.
In one possible design, the channel quality information includes at least one or a combination of: signal to interference plus noise ratio (SINR), carrier to interference plus noise ratio (CINR), multipath delay profile, beam angle spread, doppler shift.
In a second aspect, the present application further provides a first device, where the first device has a function of implementing the first device in the above method example. The functions can be realized by hardware, and the functions can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the above-described functions.
In a possible design, the structure of the first device includes a receiving unit, a processing unit, a storage unit, and a sending unit, and these units may perform corresponding functions in the foregoing method example, which is specifically referred to the detailed description in the method example, and will not be described herein again.
In one possible design, the first device has a structure including a transceiver for transceiving data and for performing communication interaction with other devices in the communication system, a processor configured to enable the first device to perform corresponding functions of the above method, and a memory. The memory is coupled to the processor and retains program instructions and data necessary for the first device.
In a third aspect, the present application further provides a communication system comprising the first device and the second device mentioned in the above design.
In a tenth aspect, the present application also provides a computer storage medium having stored thereon computer-executable instructions for causing the computer, when invoked by the computer, to perform any of the methods described above.
In an eleventh aspect, the present application also provides a computer program product containing instructions which, when run on a computer, cause the computer to perform any of the methods described above.
In a twelfth aspect, the present application further provides a chip, where the chip is connected to a memory, and is configured to read and execute program instructions stored in the memory, so as to implement any one of the above methods.
In the embodiment of the application, after determining channel quality information based on a reference signal sent by a second device, a first device determines a CP length corresponding to the channel quality information according to a stored correspondence between a plurality of pieces of channel quality information and a plurality of CP lengths, and sends the determined CP length to the second device, where the CP length is smaller than a normal CP length. In the method, a proper CP length can be selected according to the channel quality information, and the selected CP length is smaller than the normal CP length in the prior art, so that compared with the prior art, useless data in the transmission process is reduced, and the spectrum utilization rate of the system can be improved.
Drawings
Fig. 1 is a schematic architecture diagram of a communication system according to an embodiment of the present application;
fig. 2 is a flowchart of a CP length determining method according to an embodiment of the present disclosure;
FIG. 3a is a schematic diagram of a resource location according to an embodiment of the present application;
FIG. 3b is a schematic diagram of another resource location provided in the present application;
fig. 4 is a schematic structural diagram of a first apparatus according to an embodiment of the present disclosure;
fig. 5 is a block diagram of a first device according to an embodiment of the present disclosure.
Detailed Description
The present application will be described in further detail below with reference to the accompanying drawings.
The embodiment of the application provides a method and a device for determining a CP length, which are used for solving the problem that the spectrum utilization rate of a system is low due to the use of a normal CP and an extended CP in the prior art. The method and the device are based on the same inventive concept, and because the principles of solving the problems of the method and the device are similar, the implementation of the device and the method can be mutually referred, and repeated parts are not repeated.
Hereinafter, some terms in the present application are explained to facilitate understanding by those skilled in the art.
1) A terminal device, also referred to as a User Equipment (UE), is a device that provides data connectivity to a user, such as a handheld device with wireless connectivity, a vehicle mounted device, a wearable device, a computing device, a Mobile Station (MS) or other processing device connected to a wireless modem, and a mobile terminal that communicates with one or more core networks via an access network.
2) A Base Station (BS), is a device for providing a wireless access service for a terminal device, and includes but is not limited to: an evolved Node B (eNB), a Radio Network Controller (RNC), a Node B (NB), a Base Station Controller (BSC), a Base Transceiver Station (BTS), a home base station (e.g., home evolved Node B, or home Node B, HNB), a Base Band Unit (BBU), an Access Point (AP), a wireless access point (WiFi AP), a Worldwide Interoperability for Microwave Access (WiMAX) BS, and the like.
3) And the CP is to copy part of data with a certain length of the last OFDM symbol and insert the copied part of data into the foremost end of the OFDM symbol, wherein the inserted part of data is the CP.
4) The CP length is a length of a portion of data inserted at the forefront of one OFDM symbol, and may also be understood as a length of a portion of data located at the forefront of one OFDM symbol and identical to the last end, that is, a length of the CP.
5) The terms "first," "second," and the like in the description of the present application are used for descriptive purposes only and are not intended to indicate or imply relative importance nor order to be construed.
In order to describe the technical solution of the embodiment of the present application more clearly, the following describes in detail a CP length determining method and apparatus provided by the embodiment of the present application with reference to the accompanying drawings.
Fig. 1 shows a possible communication system to which the CP length determining method provided in the embodiment of the present application is applied, where an architecture of the communication system includes a first device and a second device. Wherein:
the first device is any one of a base station and a terminal device, and the second device is one of the base station and the terminal device other than the first device. When the first device and the second device transmit data, an OFDM modulation mode is adopted, that is, when the first device and the second device transmit data, OFDM symbols are mutually received and transmitted. Specifically, the first device and the second device respectively perform at least the following operations in the transmission process of the OFDM symbol:
for example, when the first device needs to send data to the second device, the first device inserts a CP in an original OFDM symbol, specifically: and the first device copies the last part of data with a certain length in the original OFDM symbol, inserts the copied part of data into the foremost end of the original OFDM symbol, and the data inserted into the foremost end is the CP, wherein the length of the data is the length of the CP. And then the first device sends the processed OFDM symbols to the second device. And after receiving the processed OFDM symbol sent by the first equipment, the second equipment demodulates the processed OFDM symbol according to the length of the CP to obtain the original OFDM symbol.
In the prior art, in the above procedure, the first device and the second device both use the CP length (i.e. the length of the normal CP or extended CP) specified by the protocol, which results in low spectrum utilization of the communication system. In the embodiment of the present application, in the above process, the CP length used by the first device and the second device may be a CP length that is selected according to the current channel quality information, and the selected CP length is smaller than the CP length used in the prior art, so that the disadvantages in the prior art can be effectively solved. The specific embodiments in the examples of the present invention are specifically described in the following examples.
It should be noted that the architecture of the communication system shown in fig. 1 is not limited to include the devices shown in the figure, and may also include other devices not shown in the figure, and those skilled in the art should understand that the details are not described here.
The communication system shown in fig. 1 is not intended to limit the communication system to which the embodiments of the present application can be applied. Therefore, the method provided by the embodiment of the application can also be applied to a fourth generation (4 generation, 4G) mobile communication system; and to various mobile communication networks of the fifth generation (5G) or the future.
The method for determining the CP length provided by the embodiment of the invention is suitable for the communication system shown in figure 1. Referring to fig. 2, the specific process of the method includes:
step 201: the method comprises the steps that a first device receives a reference signal sent by a second device, and determines channel quality information based on the reference signal, wherein the channel quality information is used for representing the channel quality between the first device and the second device.
The first device is any one of a terminal device and a base station, and the second device is one of the terminal device and the base station except the first device. Specifically, when the first device is a terminal device and the second device is a base station, the reference signal is a downlink reference signal; and when the first equipment is a base station and the second equipment is terminal equipment, the reference signal is an uplink reference signal.
In an optional embodiment, the channel quality information may include at least one or a combination of: SINR, CINR, multipath delay profile, beam angle spread, Doppler shift.
In a specific implementation, the reference signal sent by the second device to the first device is a signal with known content of the first device, and the first device may calculate channel quality information, that is, estimate channel quality between the first device and the second device, by analyzing the actually received reference signal and the reference signal with known content. Therefore, the first device can select a proper CP length to complete subsequent data transmission according to the channel quality information.
Optionally, before the first device receives the reference signal sent by the second device, the first device may further perform the following operations:
the first device sends first indication information to the second device, wherein the first indication information indicates that the first device has the capability of selecting different CP lengths;
and the first device receives second indication information of the second device, wherein the second indication information indicates that the second device has the capability of transmitting data according to different CP lengths.
By the method, the first device and the second device can both know that both can support different CP lengths to transmit data, so that the first device can determine the appropriate CP length required in the data transmission process, so that the CP length is adopted in the subsequent data transmission process with the second device, and the spectrum utilization rate of a communication system can be further improved.
Specifically, in the process of transmitting and receiving any indication information (first indication information or second indication information) in the above method, when the terminal device transmits the indication information to the base station: the terminal equipment directly sends the indication information to the base station; when the base station sends the indication information to the terminal equipment: the base station broadcasts the indication information so as to be received by the terminal equipment, or the base station directly sends the indication information to the terminal equipment. That is, when the first device is a terminal device and the second device is a base station, the terminal device directly sends the first indication information to the base station; and the terminal equipment receives the second indication information broadcasted by the base station, or the terminal equipment receives the second indication information directly sent to the terminal equipment by the base station. Similarly, when the first device is a base station and the second device is a terminal device, the receiving and sending principles of the indication information are the same, and are not described herein again.
Step 202: the first device determines the CP length corresponding to the channel quality information according to the stored corresponding relation between the plurality of channel quality information and the plurality of CP lengths, wherein the CP length is smaller than the normal CP length.
Specifically, in the data transmission process, different CP lengths have different data transmission effects under different channel quality information, and the corresponding CP lengths can ensure the transmission quality of data under the channel quality represented by the channel quality information. Therefore, the first device may determine the CP length corresponding to the channel quality information obtained in step 201 through the stored correspondence relationship, and further, the first device and the second device may perform data transmission by using the agreed CP length, so that the data transmission quality between the first device and the second device may be ensured, and since the CP length is smaller than the normal CP length, the spectrum utilization rate of the communication system may be improved compared with the prior art.
In an optional implementation manner, the sources of the correspondence stored in the first device may be classified into the following two types:
the first method comprises the following steps: the first device generates the correspondence.
And the second method comprises the following steps: the first device receives the corresponding relationship from the second device, wherein the corresponding relationship is generated by the second device.
In the above two sources, the generation manner of the correspondence relationship is the same. In an optional implementation manner, the correspondence is generated according to a plurality of channel quality information samples and a plurality of CP length samples. Specifically, when the first device or the second device generates the correspondence relationship according to the plurality of channel quality information samples and the plurality of CP length samples, the first device or the second device may perform machine learning training on the plurality of channel quality information samples and the plurality of CP length samples to generate the correspondence relationship.
Optionally, in the machine learning training process, the following machine learning algorithm may be adopted, but is not limited to: supervised learning algorithms such as a Regression model (Regression model) algorithm, a K-nearest neighbor (KNN) classification algorithm, a Support Vector Machines (SVM) algorithm, a Bayesian learning (Bayesian learning) algorithm, and the like; unsupervised learning algorithms such as K-means (K-means) algorithms, Principal Component Analysis (PCA) algorithms, Independent Component Analysis (ICA) algorithms, and the like; reinforcement learning algorithms such as Markov Decision Process (MDP) algorithms, Partially Observable Markov Decision Process (POMDP) algorithms, enhanced learning (Q-learning) algorithms, and the like.
In an optional implementation manner, the correspondence relationship includes a correspondence relationship between first channel quality information and a first CP length, where the first channel quality information is one of the multiple channel quality information samples, and the first CP length is one of the multiple CP length samples; wherein a correspondence between the first channel quality information and the first CP length satisfies the following condition: the difference between the first data and the second data is within a set difference range; the second data is obtained by demodulating first intermediate data according to the first CP length, and the first intermediate data is obtained by modulating the first data based on the first channel quality information and the first CP length. Specifically, the first intermediate data is obtained by modulating the first data based on the first channel quality information and the first CP length, and adding channel distortion and noise to the first data based on the first channel quality information and the first CP length to perform processing.
Specifically, the first data and the second data may be respectively composed of a plurality of bits, and the number of bits of the first data is the same as that of the second data. The difference between the first data and the second data may be obtained by: comparing values corresponding to the same bits in the first data and the second data, and processing a difference value obtained by comparing the values corresponding to all the bits into a target value, wherein the target value can be used as a difference between the first data and the second data. The method for processing the difference value obtained by comparing the values corresponding to all the bits into the target value may be, but is not limited to, a mean square method, a sum-of-mean square method, a least square method, and the like. Accordingly, the set difference range may be a set numerical range, such that the difference between the first data and the second data is within the set difference range when the target value is within the set numerical range. For example, the first data is 011110, the second data is 0.1, 0.9, 0.7, 0.8, 0.9, 0.2, and when values corresponding to the same bits of the first data and the second data are compared, it is known that differences obtained by comparing values corresponding to six bits are 0.1, 0.3, 0.2, 0.1, 0.2, respectively, and the target value is 0.2 by summing squares of all the differences, and when the set difference range is 0 to 10, the target value is within the set difference range. Of course, the above examples are illustrative and many other ways or possibilities are possible. Optionally, in the foregoing process, the target value may be an obtained minimum value, so that when the first channel information corresponds to the first CP length, a data transmission error may be reduced, that is, data transmission quality is better.
In an optional implementation manner, when the first device generates the correspondence relationship according to the plurality of channel quality information samples and the plurality of CP length samples, the first intermediate data may be obtained by modulating, by the first device, first data based on the first channel quality information and the first CP length; the first intermediate data may also be sent to the first device after the second device modulates the first data based on the first channel quality information and the first CP length. Specifically, the process of the first device generating the corresponding relationship in these two cases is introduced as follows:
a1, in a case that the first intermediate data is obtained by modulation by the first device, the determining, by the first device, that the first channel information quality and the first CP length form a correspondence may specifically be:
the first device randomly selects the first data, and modulates the first data based on the first channel quality information and the first CP length to obtain first intermediate data; the first device demodulates the first intermediate data according to the first CP length to obtain second data; when the first device determines that the difference between the first data and the second data is within the set difference range, the first device determines that the first channel quality information corresponds to the first CP length. Thus, the corresponding relation between the first channel quality information and the first CP length is obtained.
A2, in a case that the first intermediate data is sent by the second device that receives, the determining, by the first device, that the first channel information quality and the first CP length form a corresponding relationship may specifically be:
after the second device determines the first data and modulates the first data based on the first channel quality information and the first CP length to obtain first intermediate data, the second device sends the first intermediate data to the first device, where the first data may be agreed between the second device and the first device; the first device demodulates the first intermediate data according to the first CP length to obtain second data; when the first device determines that the difference between the first data and the second data is within the set difference range, the first device determines that the first channel quality information corresponds to the first CP length. Thus, the corresponding relation between the first channel quality information and the first CP length is obtained.
In an alternative embodiment, the process in a1 may be referred to as an offline training process, that is, the first device performs the training of the correspondence relationship; the process in a2 may be referred to as an online training process, that is, when the first device and the second device communicate, the second device cooperates with the first device to complete the training of the correspondence relationship. Therefore, the CP length can be determined in any one of the two training modes according to actual requirements, and the success rate and the accuracy of CP length determination can be guaranteed.
In a specific implementation, the first device repeats the above-mentioned process of determining the correspondence between the first channel quality information and the first CP length through a plurality of channel information quality samples and a plurality of CP length samples, and finds a plurality of pairs of channel quality information samples and CP length samples that satisfy a condition that a difference between initial data (for example, the above-mentioned first data) and demodulated data (for example, the above-mentioned second data) is within the set difference range, that is, the correspondence between the plurality of channel quality information and the plurality of CP lengths can be obtained. Optionally, the difference between the original data (e.g., the first data described above) and the demodulated data (e.g., the second data described above) may also be treated as a minimized difference.
Optionally, when the correspondence is that the first device receives from the second device, a principle of generating the correspondence by the second device is the same as a specific process of generating the correspondence by the first device in the above description, and may be referred to each other, and details are not repeated here.
Step 203: the first device sends the CP length to the second device.
In a specific implementation, after the first device sends the CP length to the second device, when the first device and the second device perform data transmission subsequently, both the first device and the second device perform modulation and demodulation according to the CP length. That is, the first device sends data to the second device based on the CP length, and demodulates the received data based on the CP length after receiving the data sent by the second device. Similarly, the second device has the same structure, and the description is not repeated here.
In an optional implementation manner, the first device determines a CP demodulation template corresponding to the CP length, where the CP demodulation template is used to indicate a demodulation parameter corresponding to the CP length; and when the first equipment receives the data sent by the second equipment based on the CP length, the first equipment demodulates the data according to the CP demodulation template. Specifically, the first device stores a plurality of CP demodulation templates, the CP demodulation templates respectively correspond to a plurality of CP lengths one by one, and the first device may determine, according to the demodulation template corresponding to each CP length, a demodulation parameter corresponding to the CP length, and may further subsequently demodulate, according to the demodulation parameter, data based on the CP length.
In an optional implementation manner, when performing data transmission based on the CP length, the first device and the second device perform data transmission by using a Physical Downlink Shared Channel (PDSCH) time-frequency resource or a Physical Uplink Shared Channel (PUSCH) time-frequency resource, so that the CP length determined in this embodiment of the present application may be used on a corresponding PDSCH or PUSCH, such as the PDSCH shown in fig. 3a and the PUSCH shown in fig. 3 b.
In an alternative embodiment, the first device and the second device may stop transmitting data based on the CP length at the end of the current frame. Further, since the CP length used in the data transmission process in the current frame is smaller than the CP length specified in the prior art, the position of the reference signal in the next frame of the current frame relative to the position of the reference signal in the prior art may move forward with the change of the CP length relative to the CP length specified in the prior art. This saves time and frequency resources.
By adopting the method for determining the CP length provided by the embodiment of the application, after the first device determines the channel quality information based on the reference signal sent by the second device, the CP length corresponding to the channel quality information is determined according to the stored corresponding relation between the plurality of channel quality information and the plurality of CP lengths, and the determined CP length is sent to the second device, wherein the CP length is smaller than the normal CP length. In the method, the appropriate CP length can be selected according to the channel quality information, and the selected CP length is smaller than the normal CP length in the prior art, so that compared with the prior art, the useless data in the transmission process is reduced, and the spectrum utilization rate of the communication system can be improved.
Based on the above embodiments, the present application further provides a first device, which is applied to the first device in the communication system shown in fig. 1, and is configured to implement the CP length determining method shown in fig. 2. Referring to fig. 4, the first apparatus 400 includes: a receiving unit 401, a processing unit 402, a storage unit 403 and a transmitting unit 404, wherein:
the receiving unit 401 is configured to receive a reference signal sent by a second device.
The processing unit 402, configured to determine channel quality information based on the reference signal, where the channel quality information is used to characterize channel quality between the first device and the second device; the first device 400 is any one of a terminal device and a base station, and the second device is one of the terminal device and the base station except for the first device 400. In an optional embodiment, the channel quality information comprises at least one or a combination of: SINR, CINR, multipath delay profile, beam angle spread, Doppler shift.
The storage unit 403 is configured to store a corresponding relationship between a plurality of pieces of channel quality information and a plurality of cyclic prefix CP lengths.
The processing unit 402 is further configured to determine a CP length corresponding to the channel quality information according to a correspondence between a plurality of pieces of channel quality information and a plurality of CP lengths of cyclic prefixes, where the CP length is smaller than a length of a normal CP.
The sending unit 404 is configured to send the CP length to the second device.
In an optional implementation manner, the correspondence is generated according to a plurality of channel quality information samples and a plurality of CP length samples.
In an optional implementation manner, the correspondence relationship includes a correspondence relationship between first channel quality information and a first CP length, where the first channel quality information is one of the multiple channel quality information samples, and the first CP length is one of the multiple CP length samples; the correspondence between the first channel quality information and the first CP length satisfies the following condition: the difference between the first data and the second data is within a set difference range; the second data is obtained by demodulating first intermediate data according to the first CP length, and the first intermediate data is obtained by modulating the first data based on the first channel quality information and the first CP length.
In an optional implementation manner, the processing unit 402 is further configured to generate the corresponding relationship.
In an optional implementation manner, the receiving unit 401 is further configured to receive the correspondence relationship from the second device. In this case, the correspondence relationship is generated by the second device and then sent to the first device 400.
In an optional implementation manner, the sending unit 404 is further configured to send, to the second device, first indication information before the receiving unit 401 receives the reference signal sent by the second device, where the first indication information indicates that the first device has a capability of selecting different CP lengths; the receiving unit 401 is further configured to receive second indication information of the second device, where the second indication information indicates that the second device has a capability of transmitting data according to different CP lengths.
In an optional implementation manner, the processing unit 402 is further configured to determine a CP demodulation template corresponding to the CP length, where the CP demodulation template is used to indicate a demodulation parameter corresponding to the CP length;
the receiving unit 401 is further configured to receive data sent by the second device based on the CP length;
the processing unit 402 is further configured to demodulate, when the receiving unit 401 receives data sent by the second device based on the CP length, the data according to the CP demodulation template.
By adopting the first device provided by the embodiment of the application, after the channel quality information is determined based on the reference signal sent by the second device, the CP length corresponding to the channel quality information is determined according to the stored corresponding relation between the plurality of channel quality information and the plurality of CP lengths, and the determined CP length is sent to the second device, wherein the CP length is smaller than the normal CP length. In the method, the appropriate CP length can be selected according to the channel quality information, and the selected CP length is smaller than the normal CP length in the prior art, so that compared with the prior art, the useless data in the transmission process is reduced, and the spectrum utilization rate of the communication system can be improved.
It should be noted that the division of the unit in the embodiment of the present application is schematic, and is only a logic function division, and there may be another division manner in actual implementation. The functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, a network device, or the like) or a processor (processor) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
Based on the above embodiments, the present application further provides a first device, where the first device is applied to a first device in a communication system as shown in fig. 1, and is used to implement the CP length determining method shown in fig. 2. Referring to fig. 5, the first apparatus 500 includes: a transceiver 501, a processor 502, and a memory 503, wherein:
the processor 502 may be a Central Processing Unit (CPU), a Network Processor (NP), or a combination of a CPU and an NP. The processor 502 may further include a hardware chip. The hardware chip may be an application-specific integrated circuit (ASIC), a Programmable Logic Device (PLD), or a combination thereof. The PLD may be a Complex Programmable Logic Device (CPLD), a field-programmable gate array (FPGA), a General Array Logic (GAL), or any combination thereof.
The transceiver 501, the processor 502 and the memory 503 are connected to each other. Optionally, the transceiver 501, the processor 502 and the memory 503 are connected to each other through a bus 504; the bus 504 may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 5, but this is not intended to represent only one bus or type of bus.
When the first device 500 implements the CP length determining method provided in the embodiment of the present application:
the transceiver 501 is used for receiving and transmitting data;
the processor 502 is configured to receive, through the transceiver 501, a reference signal sent by a second device, and determine channel quality information based on the reference signal; determining the CP length corresponding to the channel quality information according to the stored corresponding relation between the plurality of channel quality information and the plurality of CP lengths of the cyclic prefixes, wherein the CP length is smaller than the length of a conventional normal CP; transmitting the CP length to the second device through the transceiver 501; the channel quality information is used to characterize the channel quality between the first device 500 and the second device; the first device 500 is any one of a terminal device and a base station, and the second device is one of the terminal device and the base station except for the first device 500; in an optional embodiment, the channel quality information comprises at least one or a combination of: SINR, CINR, multipath time delay distribution, beam angle expansion and Doppler shift;
the memory 503 is configured to store a corresponding relationship between a plurality of channel quality information and a plurality of CP lengths.
In an optional implementation manner, the correspondence is generated according to a plurality of channel quality information samples and a plurality of CP length samples.
In an optional implementation manner, the correspondence relationship includes a correspondence relationship between first channel quality information and a first CP length, where the first channel quality information is one of the multiple channel quality information samples, and the first CP length is one of the multiple CP length samples; the correspondence between the first channel quality information and the first CP length satisfies the following condition: the difference between the first data and the second data is within a set difference range; the second data is obtained by demodulating first intermediate data according to the first CP length, and the first intermediate data is obtained by modulating first data based on the first channel quality information and the first CP length.
In an optional implementation, the processor 502 is further configured to generate the corresponding relationship.
In an optional implementation, the processor 502 is further configured to receive the correspondence from the second device through the transceiver 501.
In an optional implementation, the processor 502 is further configured to send, by the transceiver 501, first indication information to the second device before receiving, by the transceiver 501, the reference signal sent by the second device, where the first indication information indicates that the first device has a capability of selecting different CP lengths;
the processor 502 is further configured to receive, through the transceiver 501, second indication information of the second device, where the second indication information indicates that the second device has a capability of transmitting data according to different CP lengths.
The processor 502 is further configured to determine a CP demodulation template corresponding to the CP length, where the CP demodulation template is used to indicate a demodulation parameter corresponding to the CP length.
The processor 502 is further configured to receive, through the transceiver 501, data sent by the second device based on the CP length, and demodulate the data according to the CP demodulation template.
The memory 503 is also used for storing programs and the like. In particular, the program may include program code comprising computer operating instructions. The memory 503 may include RAM, and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory. The processor 502 executes the application program stored in the memory 503 to implement the above functions, thereby implementing the CP length determining method shown in fig. 2.
By adopting the first device provided by the embodiment of the application, after the channel quality information is determined based on the reference signal sent by the second device, the CP length corresponding to the channel quality information is determined according to the stored corresponding relation between the plurality of channel quality information and the plurality of CP lengths, and the determined CP length is sent to the second device, wherein the CP length is smaller than the normal CP length. In the method, a proper CP length can be selected according to the channel quality information, and the selected CP length is smaller than the normal CP length in the prior art, so that compared with the prior art, useless data in the transmission process is reduced, and the spectrum utilization rate of the system can be improved.
In summary, with the CP length determining method and apparatus provided in the embodiments of the present application, after determining channel quality information based on a reference signal sent by a second device, according to a stored correspondence between a plurality of pieces of channel quality information and a plurality of CP lengths, a first device determines a CP length corresponding to the channel quality information, and sends the determined CP length to the second device, where the CP length is smaller than a normal CP length. In the method, the appropriate CP length can be selected according to the channel quality information, and the selected CP length is smaller than the normal CP length in the prior art, so that compared with the prior art, the useless data in the transmission process is reduced, and the spectrum utilization rate of the communication system can be improved.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the embodiments of the present application without departing from the scope of the embodiments of the present application. Thus, if such modifications and variations of the embodiments of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to encompass such modifications and variations.
Claims (13)
1. A cyclic prefix length determination method, comprising:
a first device receives a reference signal sent by a second device, and determines channel quality information based on the reference signal, wherein the channel quality information is used for representing the channel quality between the first device and the second device; the first device is any one of a terminal device and a base station, and the second device is one of the terminal device and the base station except the first device;
the first device determines the CP length corresponding to the channel quality information according to the stored corresponding relation between the plurality of channel quality information and the plurality of CP lengths of the cyclic prefix, wherein the CP length is smaller than the length of a conventional normal CP;
the first device sends the CP length to the second device;
wherein the correspondence is generated according to a plurality of channel quality information samples and a plurality of CP length samples; the corresponding relationship comprises a corresponding relationship between first channel quality information and a first CP length, wherein the first channel quality information is one of the plurality of channel quality information samples, and the first CP length is one of the plurality of CP length samples; the correspondence between the first channel quality information and the first CP length satisfies the following condition: the difference between the first data and the second data is within a set difference range; the second data is obtained by demodulating first intermediate data according to the first CP length, and the first intermediate data is obtained by modulating the first data based on the first channel quality information and the first CP length.
2. The method of claim 1, wherein the method further comprises:
the first device generates the correspondence, or the first device receives the correspondence from the second device.
3. The method of any of claims 1-2, wherein prior to the first device receiving the reference signal transmitted by the second device, the method further comprises:
the first device sends first indication information to the second device, wherein the first indication information indicates that the first device has the capability of selecting different CP lengths;
and the first device receives second indication information of the second device, wherein the second indication information indicates that the second device has the capability of transmitting data according to different CP lengths.
4. The method of any one of claims 1-2, further comprising:
the first device determines a CP demodulation template corresponding to the CP length, wherein the CP demodulation template is used for indicating a demodulation parameter corresponding to the CP length;
and when the first equipment receives the data sent by the second equipment based on the CP length, the first equipment demodulates the data according to the CP demodulation template.
5. The method of any of claims 1-2, wherein the channel quality information comprises at least one or a combination of: signal to interference plus noise ratio SINR, carrier to interference plus noise ratio CINR, multipath delay profile, beam angle spread, Doppler shift.
6. A first device, comprising:
a receiving unit, configured to receive a reference signal sent by a second device;
a processing unit configured to determine channel quality information based on the reference signal, the channel quality information being used to characterize channel quality between the first device and the second device; the first device is any one of a terminal device and a base station, and the second device is one of the terminal device and the base station except the first device;
a storage unit, configured to store a correspondence between a plurality of pieces of channel quality information and a plurality of cyclic prefix CP lengths;
the processing unit is further configured to determine, according to a correspondence between a plurality of pieces of channel quality information stored in the storage unit and a plurality of CP lengths of cyclic prefixes, a CP length corresponding to the channel quality information, where the CP length is smaller than a length of a normal CP;
a sending unit, configured to send the CP length to the second device;
wherein the correspondence is generated according to a plurality of channel quality information samples and a plurality of CP length samples; the corresponding relationship comprises a corresponding relationship between first channel quality information and a first CP length, wherein the first channel quality information is one of the plurality of channel quality information samples, and the first CP length is one of the plurality of CP length samples; the correspondence between the first channel quality information and the first CP length satisfies the following condition: the difference between the first data and the second data is within a set difference range; the second data is obtained by demodulating first intermediate data according to the first CP length, and the first intermediate data is obtained by modulating first data based on the first channel quality information and the first CP length.
7. The first device of claim 6, wherein the processing unit is further to:
and generating the corresponding relation.
8. The first device of any of claims 6-7, wherein the receiving unit is further configured to:
receiving the correspondence from the second device.
9. The first apparatus of any of claims 6-7,
the sending unit is further configured to send, to the second device, first indication information before the receiving unit receives the reference signal sent by the second device, where the first indication information indicates that the first device has a capability of selecting different CP lengths;
the receiving unit is further configured to receive second indication information of the second device, where the second indication information indicates that the second device has a capability of transmitting data according to different CP lengths.
10. The first apparatus of any of claims 6-7,
the processing unit is further configured to determine a CP demodulation template corresponding to the CP length, where the CP demodulation template is used to indicate a demodulation parameter corresponding to the CP length;
the receiving unit is further configured to receive data sent by the second device based on the CP length;
the processing unit is further configured to demodulate, when the receiving unit receives data sent by the second device based on the CP length, the data according to the CP demodulation template.
11. The first device of any of claims 6-7, wherein the channel quality information comprises at least one or a combination of: signal to interference plus noise ratio SINR, carrier to interference plus noise ratio CINR, multipath delay profile, beam angle spread, Doppler shift.
12. A computer storage medium having stored thereon computer-executable instructions for causing a computer to perform the method of any one of claims 1-5 when invoked by the computer.
13. A chip, wherein the chip is connected to a memory for reading and executing program instructions stored in the memory to implement the method of any one of claims 1 to 5.
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| PCT/CN2018/076675 WO2019157636A1 (en) | 2018-02-13 | 2018-02-13 | Method and apparatus for determining cyclic prefix length |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1585392A (en) * | 2004-06-07 | 2005-02-23 | 东南大学 | Self adaptable transmission for OFDMA system |
| CN101401323A (en) * | 2006-03-15 | 2009-04-01 | 松下电器产业株式会社 | Wireless transmitting device and wireless transmitting method |
| CN101882942A (en) * | 2009-05-07 | 2010-11-10 | 中国移动通信集团公司 | Sounding reference signal (SRS) sending/receiving method, mobile communication terminal and base station |
| CN102077534A (en) * | 2008-04-25 | 2011-05-25 | 诺基亚西门子通信公司 | Apparatus, methods, and computer program products providing an indication of cyclic prefix length |
| US8422577B1 (en) * | 2011-03-25 | 2013-04-16 | Sprint Spectrum L.P. | Method and system for selecting cyclic prefix length based on signal quality reports |
| CN104756421A (en) * | 2012-10-29 | 2015-07-01 | Lg电子株式会社 | Method and user equipment for transreceiving tdd |
| EP2850756B1 (en) * | 2012-05-14 | 2017-04-05 | Telefonaktiebolaget LM Ericsson (publ) | Enhanced receiver adaptation based on relation between signals from aggressor and victim cells |
| WO2017219215A1 (en) * | 2016-06-20 | 2017-12-28 | 华为技术有限公司 | Method and apparatus for transmitting ofdm symbol |
| CN107580770A (en) * | 2015-05-06 | 2018-01-12 | 英特尔Ip公司 | Method and apparatus for the channel estimation of the mobile system of the circulating prefix-length with deficiency |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101357859B1 (en) * | 2007-09-19 | 2014-02-06 | 삼성전자주식회사 | Apparatus and method for cycle prefix length detecton in mobile communication system |
| KR20150043345A (en) * | 2012-08-05 | 2015-04-22 | 엘지전자 주식회사 | Method of configuring cyclic prefix for small cell in wireless communication system and apparatus therefor |
| WO2014109569A1 (en) * | 2013-01-09 | 2014-07-17 | 엘지전자 주식회사 | Method for transmitting signal and apparatus for same |
| US10064041B2 (en) * | 2013-01-31 | 2018-08-28 | Lg Electronics Inc. | Method for setting cyclic prefix for D2D (device-to-device) communication in radio communications system and apparatus therefor |
| US10411928B2 (en) * | 2016-02-23 | 2019-09-10 | Qualcomm Incorporated | Dynamic cyclic prefix (CP) length |
| CN107154907A (en) * | 2016-03-03 | 2017-09-12 | 北京三星通信技术研究有限公司 | Signal sending, receiving method and corresponding emitter and receiver based on filtering |
-
2018
- 2018-02-13 CN CN201880089001.4A patent/CN111699660B/en active Active
- 2018-02-13 WO PCT/CN2018/076675 patent/WO2019157636A1/en active Application Filing
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1585392A (en) * | 2004-06-07 | 2005-02-23 | 东南大学 | Self adaptable transmission for OFDMA system |
| CN101401323A (en) * | 2006-03-15 | 2009-04-01 | 松下电器产业株式会社 | Wireless transmitting device and wireless transmitting method |
| CN102077534A (en) * | 2008-04-25 | 2011-05-25 | 诺基亚西门子通信公司 | Apparatus, methods, and computer program products providing an indication of cyclic prefix length |
| CN101882942A (en) * | 2009-05-07 | 2010-11-10 | 中国移动通信集团公司 | Sounding reference signal (SRS) sending/receiving method, mobile communication terminal and base station |
| US8422577B1 (en) * | 2011-03-25 | 2013-04-16 | Sprint Spectrum L.P. | Method and system for selecting cyclic prefix length based on signal quality reports |
| EP2850756B1 (en) * | 2012-05-14 | 2017-04-05 | Telefonaktiebolaget LM Ericsson (publ) | Enhanced receiver adaptation based on relation between signals from aggressor and victim cells |
| CN104756421A (en) * | 2012-10-29 | 2015-07-01 | Lg电子株式会社 | Method and user equipment for transreceiving tdd |
| CN107580770A (en) * | 2015-05-06 | 2018-01-12 | 英特尔Ip公司 | Method and apparatus for the channel estimation of the mobile system of the circulating prefix-length with deficiency |
| WO2017219215A1 (en) * | 2016-06-20 | 2017-12-28 | 华为技术有限公司 | Method and apparatus for transmitting ofdm symbol |
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| Publication number | Publication date |
|---|---|
| CN111699660A (en) | 2020-09-22 |
| WO2019157636A1 (en) | 2019-08-22 |
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