CN113890707B - Communication method, device, equipment and storage medium - Google Patents
Communication method, device, equipment and storage medium Download PDFInfo
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- CN113890707B CN113890707B CN202111132003.7A CN202111132003A CN113890707B CN 113890707 B CN113890707 B CN 113890707B CN 202111132003 A CN202111132003 A CN 202111132003A CN 113890707 B CN113890707 B CN 113890707B
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- H04L5/00—Arrangements affording multiple use of the transmission path
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Abstract
The application provides a communication method, a device, equipment and a storage medium. The method is applied to a first communication device and comprises the following steps: and acquiring channel information corresponding to n resource scheduling periods in the time window, wherein n is an integer greater than 1, determining whether the reference signal of the ith resource scheduling period is multiplexed in the nth resource scheduling period according to the channel information corresponding to the n resource scheduling periods, and not transmitting the reference signal to the second communication equipment in the nth resource scheduling period under the condition that the reference signal of the ith resource scheduling period is multiplexed in the nth resource scheduling period. The pilot frequency overhead is reduced, and the network resource utilization rate is improved.
Description
Technical Field
The present disclosure relates to the field of communications technologies, and in particular, to a communications method, apparatus, device, and storage medium.
Background
In some communication systems, such as in long term evolution (Long Term Evolution, LTE) systems, information about a channel is obtained between a transmitting end device and a receiving end device by transmitting a reference signal, for example, the receiving end can demodulate, estimate a channel, locate a transmission signal, accurately receive a useful signal, etc. based on the reference signal. The reference signals of the current LTE physical layer include, for example: cell-specific reference signals (Cell-specific Reference Signal, CRS), demodulation reference signals (Demodulation Reference Signal, DMRS), positioning reference signals (Positioning Reference Signals, PRS), channel state information reference signals (Channel State Information Reference Signal, CSI-RS), multicast/multicast single frequency network reference signals (Multimedia Broadcast multicast service Single Frequency Network reference signal, MBSFN-RS), and so forth.
Currently, the transmitting end device needs to transmit a reference signal to the receiving end device every resource scheduling period (Transmission Time Interval, TTI), but in some communication scenarios where the TTI is shorter, pilot overhead is larger.
Disclosure of Invention
The communication method, the device, the equipment and the storage medium can reduce pilot frequency overhead in the information transmission process.
In a first aspect, the present application provides a communication method, applied to a first communication device, including: channel information corresponding to n resource scheduling periods in a time window is acquired, wherein n is an integer greater than 1; determining whether the nth resource scheduling period multiplexes the reference signal of the ith resource scheduling period according to the channel information respectively corresponding to the nth resource scheduling period; in the case where the reference signal of the ith resource scheduling period is multiplexed in the nth resource scheduling period, the reference signal is not transmitted to the second communication apparatus in the nth resource scheduling period.
In a second aspect, the present application provides a communication device, including: the receiving and transmitting unit is used for acquiring channel information corresponding to n resource scheduling periods in a time window respectively, wherein n is an integer greater than 1; the processing unit is used for determining whether the nth resource scheduling period multiplexes the reference signal of the ith resource scheduling period according to the channel information respectively corresponding to the nth resource scheduling period; the processing unit is further configured to, in a case where the reference signal of the ith resource scheduling period is multiplexed in the nth resource scheduling period, not transmit the reference signal to the second communication device in the nth resource scheduling period.
In a third aspect, the present application provides a terminal device, including: a processor and a memory for storing a computer program for invoking and running the computer program stored in the memory for performing the method as in the first aspect or in each possible implementation of the first aspect.
In a fourth aspect, the present application provides a chip comprising: a processor for invoking and executing computer instructions from memory to cause a device on which the chip is mounted to perform the method as in the first aspect or in each possible implementation of the first aspect.
In a fifth aspect, the present application provides a computer-readable storage medium storing computer program instructions for causing a computer to perform a method as in the first aspect or in each possible implementation of the first aspect.
In a sixth aspect, the present application provides a computer program product comprising computer program instructions for causing a computer to perform the method as in the first aspect or in each of the possible implementations of the first aspect.
According to the communication method, the device, the equipment and the storage medium, the first communication equipment determines whether the nth resource scheduling period is multiplexed with the reference signal of the ith resource scheduling period or not based on the channel information corresponding to the nth resource scheduling period in the time window, and the reference signal is not transmitted like the second communication equipment in the nth resource scheduling period under the condition that the reference signal of the ith resource scheduling period is multiplexed in the nth resource scheduling period, so that pilot frequency expenditure is reduced.
Drawings
Fig. 1 is a schematic architecture diagram of a mobile communication system to which an embodiment of the present application is applied.
Fig. 2 is a schematic diagram of time domain resources of a reference signal provided in the present application.
Fig. 3 is a schematic interaction flow diagram of a communication method 200 provided in an embodiment of the present application.
Fig. 4 is a schematic flow chart of a communication method 300 provided in an embodiment of the present application.
Fig. 5 shows a schematic block diagram of a communication device 400 according to an embodiment of the present application.
Fig. 6 is a schematic block diagram of an apparatus 500 of an embodiment of the present application.
Detailed Description
The technical solutions in the present application will be described below with reference to the accompanying drawings.
Fig. 1 is a schematic architecture diagram of a mobile communication system to which an embodiment of the present application is applied. As shown in fig. 1, the mobile communication system includes a core network device 110, a network device 120, and at least one terminal device (e.g., terminal device 130 and terminal device 140 in fig. 1). The terminal equipment is connected with the network equipment in a wireless mode, and the network equipment is connected with the core network equipment in a wireless or wired mode. The core network device and the network device may be separate physical devices, or may integrate the functions of the core network device and the logic functions of the network device on the same physical device, or may integrate the functions of a part of the core network device and the functions of a part of the network device on one physical device. The terminal device may be fixed in position or may be movable. Fig. 1 is only a schematic diagram, and other network devices may be further included in the communication system, for example, a wireless relay device and a wireless backhaul device may also be included, which are not shown in fig. 1. The embodiments of the present application do not limit the number of core network devices, and terminal devices included in the mobile communication system.
The network device is an access device that a terminal device accesses to the mobile communication system in a wireless manner, and may be a base station NodeB, an evolved base station eNodeB, a base station in an NR mobile communication system, a base station in a future mobile communication system, or an access node in a WiFi system, etc., where the embodiment of the present application does not limit a specific technology and a specific device configuration adopted by the network device.
The Terminal device may also be referred to as a Terminal, a User Equipment (UE), a Mobile Station (MS), a Mobile Terminal (MT), etc. The terminal device may be a mobile phone, a tablet (Pad), a computer with wireless transceiving function, a Virtual Reality (VR) terminal device, an augmented Reality (Augmented Reality, AR) terminal device, a wireless terminal in industrial control (industrial control), a wireless terminal in unmanned driving (self driving), a wireless terminal in teleoperation (remote medical surgery), a wireless terminal in smart grid (smart grid), a wireless terminal in transportation security (transportation safety), a wireless terminal in smart city (smart city), a wireless terminal in smart home (smart home), etc.
Network devices and terminal devices may be deployed on land, including indoors or outdoors, hand-held or vehicle-mounted; the device can be deployed on the water surface; but also on aerial planes, balloons and satellites. The embodiment of the application does not limit the application scene of the network equipment and the terminal equipment.
The embodiment of the application can be suitable for downlink signal transmission and also can be suitable for uplink signal transmission. For downlink signal transmission, the transmitting device is a network device, and the corresponding receiving device is a terminal device. For uplink signal transmission, the transmitting device is a terminal device, and the corresponding receiving device is a network device. The transmission direction of the signals in the embodiments of the present application is not limited.
The network device and the terminal device can communicate through a licensed spectrum (licensed spectrum), an unlicensed spectrum (unlicensed spectrum) or both the licensed spectrum and the unlicensed spectrum. The network device and the terminal device may communicate with each other through a frequency spectrum of 6G or less, may communicate through a frequency spectrum of 6G or more, and may communicate using a frequency spectrum of 6G or less and a frequency spectrum of 6G or more at the same time. The embodiments of the present application do not limit the spectrum resources used between the network device and the terminal device.
It should be understood that the present application is not limited to specific forms of network devices and terminal devices.
Taking a long term evolution (Long Term Evolution, LTE) system as an example, as shown in fig. 2, two resource scheduling periods (Transmission Time Interval, TTI) are included in one subframe, and 7 orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing, OFDM) symbols are included in each TTI. For example, in fig. 2, symbols 0 to 6 are the first TTI, and symbols 7 to 13 are the second TTI. Each TTI includes at least one symbol carrying a demodulation reference signal (Demodulatin Reference Signal, DMRS). For example, in fig. 2, symbol 5 and symbol 6 are used to carry DMRS in the first TTI, and symbol 12 and symbol 13 are used to carry DMRS in the second TTI.
However, in some communication systems, the number of symbols included in a TTI is small, DMRS may be carried in a physical uplink shared channel (physical uplink shared channel, PUSCH) channel during uplink transmission, and may be carried in a physical downlink shared channel (physical downlink shared channel, PDSCH) channel during downlink transmission, and the DMRS occupies at least one symbol in each TTI, which results in less resources for carrying data in each TTI and higher pilot overhead.
For example, in the downlink frame structure design of the LTE Release 8 system, DMRS occupies 6 Resource Elements (REs) in each Resource Block (RB) to support dual-layer transmission, so that the DMRS overhead occupies 7% (each RB contains 7×12=84 REs), and 12 REs are used in each RB proposed by Release 10 to support higher 8-layer transmission, where the DMRS overhead occupies 14%.
The embodiment of the application provides a multiplexing scheme of reference signals aiming at the problem of overlarge pilot frequency overhead. And determining the reference signal corresponding to any resource scheduling period before the transmission or multiplexing of the reference signal in the nth resource scheduling period by analyzing channel information corresponding to each of n resource scheduling periods in the time window.
It should be noted that, in the embodiments of the present application, DMRS in reference signals is merely taken as an example, and the embodiments of the present application are not limited in any way, for example, reference signals in the embodiments of the present application may also be CRS, PRS, CSI-RS or MBSFN-RS, etc.
To facilitate an understanding of the embodiments of the present application, the following description is made.
First, in the embodiments shown below, the first, second, and various numerical numbers are merely for convenience of description and are not intended to limit the scope of the embodiments of the present application. For example, different communication devices, preset values, etc. are distinguished.
Second, the "protocol" referred to in the embodiments of the present application may refer to a standard protocol in the field of communications, and may include, for example, an LTE protocol, an NR protocol, and related protocols applied in a future communication system, which is not limited in this application.
Third, in the embodiments of the present application, the descriptions of "when … …", "in the case of … …", "if" and the like all refer to that the device (e.g., the terminal device or the network device) will make a corresponding process under some objective condition, and are not limited in time, nor do the devices (e.g., the terminal device or the network device) require an action of determining when implemented, nor do other limitations mean that there are any other limitations.
The communication method provided in the embodiment of the present application will be described below with reference to the accompanying drawings.
It should be understood that the following description is given mainly for the convenience of understanding and explanation, and the method provided in the embodiment of the present application is mainly given by taking information interaction between the first communication device and the second communication device as an example. In the uplink transmission, the first communication device may be any one of the terminal devices in the communication system shown in fig. 1, for example, the terminal device 130 or the terminal device 140, and the second communication device may be the network device 120 in the communication system shown in fig. 1. In the downlink transmission, the first communication device may be the network device 120 in the communication system shown in fig. 1, and the second communication device may be any terminal device in the communication system shown in fig. 1, for example, the terminal device 130 or the terminal device 140.
It should be understood that this should not constitute any limitation as to the subject matter of the method provided herein. The method provided in the embodiment of the present application may be executed as a main body of execution of the method provided in the embodiment of the present application, as long as the method provided in the embodiment of the present application can be executed by a program having a code of the method provided in the embodiment of the present application. For example, any of the communication devices shown in the following embodiments may be replaced with a component in the communication device, such as a chip, a system on a chip, or other functional modules capable of calling and executing a program.
Fig. 3 is a schematic interaction flow diagram of a communication method 200 provided in an embodiment of the present application. As shown in fig. 3, the method may include at least some of the steps.
S210, the second communication device sends channel information corresponding to n resource scheduling periods in a time window, wherein n is an integer greater than 1.
Correspondingly, the first communication device acquires channel information corresponding to n resource scheduling periods in a time window, wherein n is an integer greater than 1.
S220, the first communication device determines whether the nth resource scheduling period multiplexes the reference signal of the ith resource scheduling period according to the channel information corresponding to the n resource scheduling periods, wherein i is an integer greater than or equal to 1 and less than n.
S230, the first communication device does not transmit the reference signal to the second communication device in the nth resource scheduling period when multiplexing the reference signal of the ith resource scheduling period in the nth resource scheduling period. S230 is not shown in the figure.
Wherein the time window may be a preset or protocol defined period of time.
The time window may include a plurality of resource scheduling periods, and the n resource scheduling periods are all or part of the plurality of resource scheduling periods within the time window.
Alternatively, the time window may be one or more time units, e.g. may be one subframe.
The channel information corresponding to each resource scheduling period is measured in the resource scheduling period. For example, in downlink transmission, the first communication device receives a measurement result reported by the second communication device, where the measurement result is used to indicate channel information corresponding to one resource scheduling period. In uplink transmission, the first communication device may measure channel information for any resource scheduling period.
In general, channel information within one resource scheduling period is consistent.
In S220 described above, the nth resource scheduling period may be understood as the current resource scheduling period. In this embodiment of the present application, the first communication device may determine, for example, according to the fluctuation conditions of channel information corresponding to the n resource scheduling periods, whether the nth resource scheduling period multiplexes the reference signal of the ith resource scheduling period.
For example, the channel information may be SINR. For example, in S220, the first communication device may determine whether the channel state in the n resource scheduling periods is stable, that is, whether the reference signal of the ith resource scheduling period may be multiplexed in the nth resource scheduling period, based on the variance of SINR detected in the n resource scheduling periods, or the SINR difference between the two resource scheduling periods.
Further, the first communication device determines whether to transmit a reference signal for an nth resource scheduling period, which is generated for the nth resource scheduling period by the first communication device, based on whether the reference signal for the nth resource scheduling period is multiplexed or not.
Alternatively, the reference signal may be a DMRS.
As shown in fig. 3, the step S230 may include:
s231, the first communication device sends indication information to the second communication device when the reference signal of the ith resource scheduling period is multiplexed in the nth resource scheduling period; the indication information is used for indicating the time-frequency resource of the reference signal of the ith resource scheduling period.
S232, the first communication device sends the reference signal to the second communication device in the nth resource scheduling period under the condition that whether the reference signal of the ith resource scheduling period is not multiplexed in the nth resource scheduling period.
Note that, in the present embodiment, one of S231 and S232 is performed, that is, the above-described S231 and S232 need not be performed simultaneously.
In the above S231, since the nth resource scheduling period multiplexes the reference signals of the ith resource scheduling period, the current nth resource scheduling period may multiplex the reference signals that have been transmitted in the previous resource scheduling period, in which case the first communication device does not need to transmit the reference signals of the nth resource scheduling period to the second communication device, but indicates that the reference signals that the second communication device can use are the reference signals of the ith resource scheduling period, for example, may indicate the time-frequency resources of the available reference signals. Correspondingly, the second communication device can acquire the reference signal of the ith resource scheduling period through the time-frequency resource indicated by the indication information. Wherein the i-th resource scheduling period may be any one of the 1 st to n-1 st resource scheduling periods, that is, i may be an integer less than n and greater than 0.
In S232, the channel state between the n resource scheduling periods is unstable, so that the reference signal sent by the ith resource scheduling period cannot be multiplexed in the current nth resource scheduling period, in other words, if the channel state between the n resource scheduling periods is unstable, the reference signal sent by the ith resource scheduling period is still multiplexed in the nth resource scheduling period, which results in lower accuracy of signal estimation and lower reliability of uplink or downlink transmission. In this case, the first communication device may transmit a new reference signal in the nth resource scheduling period.
In the embodiment of the present application, the first communication device determines, based on channel information corresponding to n resource scheduling periods in the time window, whether the nth resource scheduling period multiplexes the reference signal of the ith resource scheduling period, and under the condition that the nth resource scheduling period multiplexes the reference signal of the ith resource scheduling period, the nth resource scheduling period is no longer like the second communication device in transmitting the reference signal, thereby reducing pilot overhead and improving network resource utilization.
Optionally, the channel information includes a signal to interference plus noise ratio (Signal to Interference plus Noise Ratio, SINR). For example, the signal to noise ratio obtained after the first communication device performs channel information measurement in any resource scheduling period.
Fig. 4 is a schematic flow chart of a communication method 300 provided in an embodiment of the present application. The above S220 is exemplarily described with reference to fig. 4.
The S220 may include:
s221, the first communication device obtains the time domain length of the nth resource scheduling period, and determines whether to send a reference signal to the second communication device in the nth resource scheduling period.
When the time domain length of the nth resource scheduling period is greater than or equal to the preset time domain length, the following S222-1 is executed; when the time domain of the nth resource scheduling period is smaller than the preset time domain length, the following S222-2 is performed. Execution of S222-2 will execute S223.
S222-1, the first communication device sends a reference signal to the second communication device in an nth resource scheduling period.
S222-2, the first communication device determines the variance of SINR corresponding to the n resource scheduling periods according to the channel information corresponding to the n resource scheduling periods.
S223, the first communication device determines whether the nth resource scheduling period multiplexes the reference signal of the ith resource scheduling period according to the variance of SINR determined in S222-2 and the first preset value.
When the variance of the SINR is less than or equal to the first preset value, the following S224-1 is executed; when the variance of the SINR is greater than the first preset value, the following S224-2 is performed. Execution of S224-1 will execute one of the following S225-1, S225-2, and S225-3.
S224-1, the first communication device determines whether the nth resource scheduling period multiplexes the reference signal of the ith resource scheduling period according to the channel difference between every two resource scheduling periods in the n resource scheduling periods and the second preset value.
S224-2, the first communication device determines that the reference signal of the ith resource scheduling period is not multiplexed by the nth resource scheduling period.
When the channel difference between every two resource scheduling periods is smaller than or equal to the second preset value, the following S225-1 is executed; when the channel difference between at least two resource scheduling periods is greater than a second preset value, the following S225-2 is executed; when the channel difference between every two resource scheduling periods is greater than the second preset value, the following S225-3 is performed. Execution of S225-2 will execute one of the following S226-1 and S226-2.
S225-1, the first communication device may determine that the nth resource scheduling period multiplexes the reference signals of the ith resource scheduling period.
S225-2, the first communication device confirms whether the nth resource scheduling period of the first communication device multiplexes the reference signal of the ith resource scheduling period according to the channel difference between the second resource scheduling period and the nth resource scheduling period and the second preset value.
S225-3, the first communication device may confirm that the reference signal of the ith resource scheduling period is not multiplexed by the nth resource scheduling period.
In the above step S225-2, when the channel difference between the second resource scheduling period and the nth resource scheduling period is less than or equal to the second preset value, the following step S226-1 is executed; when the channel difference between the second resource scheduling period and the nth resource scheduling period is greater than the second preset value, the following S226-2 is performed.
The first communication device may determine that the nth resource scheduling period multiplexes the reference signal of the ith resource scheduling period S226-1.
In S226-2, the first communication device may determine that the reference signal of the ith resource scheduling period is not multiplexed by the nth resource scheduling period.
In S221, the time domain length refers to the number of time units occupied by one resource scheduling period, and the time units may be, for example, symbols, time slots, and the like. The time domain length of the nth resource scheduling period in this embodiment may be the number of symbols, for example, may be 7 symbols in fig. 2, or may be 2 symbols, 5 symbols, or the like. The preset time domain length may be 7 symbols.
In general, the time domain length of each of the n resource scheduling periods is the same. But the method and the device are also applicable to scenes with different time domain lengths of each resource scheduling period.
When the first communication device determines that the time domain length of the nth resource scheduling period is smaller than the preset time domain length, in order to avoid excessive pilot frequency overhead, the first communication device may not transmit a reference signal in the nth resource scheduling period, for example, the first communication device may select a reference signal transmitted in the resource scheduling period before multiplexing, and for example, the first communication device may combine with the channel state to determine whether the channel state is stable, that is, determine whether the nth resource scheduling period multiplexes the reference signal in the ith resource scheduling period, and further determine whether the pilot frequency overhead can be reduced by not transmitting the reference signal.
For example, the first communication device may determine whether the reference signal may not be transmitted in the nth resource scheduling period in combination with the variance of SINR. Variance S of the SINR 2 For example, the following formula may be satisfied:
wherein the average value of SINR
The following formula is satisfied: />
In S223, when the variance of the SINR is smaller than or equal to the first preset value, it indicates that the channel state fluctuation in the n resource scheduling periods is smaller, that is, the channel state is more stable, and then the nth resource scheduling period may multiplex the reference signal of the ith resource scheduling period. At this time, the first communication device may not transmit the reference signal, that is, multiplex the reference signal of any previous resource scheduling period; or when the first communication device determines that the channel state is stable, determining whether the nth resource scheduling period multiplexes the reference signal of the ith resource scheduling period or not further based on the channel difference between every two resource scheduling periods in the n resource scheduling periods.
For example, the first communication device may determine a channel difference between every two resource scheduling periods of the n resource scheduling periods based on the following formula.
|SINR j -SINR i |，n≥j＞i≥1
Wherein SINR j SINR for channel information in the j-th resource scheduling period i Channel information within the period is scheduled for the ith resource. Scheduling period and i-th resource for j-th resource based on the above formulaAnd (3) traversing 1 to n by j according to the channel difference between the scheduling periods, and obtaining the channel difference between every two resource scheduling periods in n resource scheduling periods after traversing 1 to j by i.
The first communication device determines that the channel difference between each two resource scheduling periods is smaller than or equal to a second preset value, or is larger than the second preset value, or that the channel between at least two resource scheduling periods is larger than the second preset value, by comparing the channel difference between each two resource scheduling periods with the second preset value.
For the case that the channel difference between every two resource scheduling periods is smaller than or equal to the second preset value, the first communication device determines that the channel state between n resource scheduling periods is always stable, that is, the first communication device can multiplex the reference signal of the 1 st resource scheduling period, it can be understood that all of the 2 nd to n-1 st resource scheduling periods can multiplex the reference signal of the 1 st resource scheduling period.
For the case that the channel difference between every two resource scheduling periods is larger than the second preset value, the first communication device determines that no reference signal which can be multiplexed in the nth resource scheduling period exists in the first n-1 resource scheduling periods.
For the case that the channel between at least two resource scheduling periods is larger than the second preset value, the first communication device determines that the reference signal which can be multiplexed in the nth resource scheduling period exists in the first n-1 resource scheduling periods, and in this case, the first communication device can further determine whether the reference signal in the nth-1 resource scheduling period can be multiplexed in the nth resource scheduling period.
In the process of determining whether the reference signal of the n-1 th resource scheduling period can be multiplexed in the n-th resource scheduling period by the first communication device. For example, the first communication device may determine whether the nth resource scheduling period of the first communication device multiplexes the reference signal of the ith resource scheduling period according to the channel difference between the second resource scheduling period and the current resource scheduling period (i.e. the nth resource scheduling period) and the second preset value, for example, when the channel difference between the second resource scheduling period and the nth resource scheduling period is less than or equal to the second preset value, the first communication device determines that the nth resource scheduling period may multiplex the reference signal of the nth-1 resource scheduling period, and it should be understood that the reference signal of the nth-1 resource scheduling period may be the reference signal in the nth-1 resource scheduling period or may be the reference signal of any resource scheduling period before multiplexing; when the channel difference between the second resource scheduling period and the nth resource scheduling period is larger than a second preset value, the first communication equipment sends a new reference signal according to the nth resource scheduling period.
In the above-described S225-2 procedure, the second resource scheduling period is a resource scheduling period preceding the nth resource scheduling period.
It should be understood that the first preset value and the second preset value may be the same or different.
In this embodiment, the first communication device determines, based on the time domain length of the nth resource scheduling period, whether to send the reference signal in the nth resource scheduling period or the reference signal in the resource scheduling period before multiplexing, so that pilot overhead is reduced by multiplexing the reference signal when the time domain length of the nth resource scheduling period is smaller, and the reference signal is not multiplexed when the time domain length of the nth resource scheduling period is larger, thereby improving transmission reliability; the first communication equipment determines a reference signal transmitted in an nth resource scheduling period or a reference signal of a resource scheduling period before multiplexing based on the variance of the SINR, so that pilot frequency overhead is reduced through multiplexing of the reference signal when the channel stability of the nth resource scheduling period is good, the reference signal is not multiplexed when the channel stability of the nth resource scheduling period is poor, and the reliability of transmission is improved; the first communication device determines, based on the channel difference between every two resource scheduling periods in the n resource scheduling periods, whether the nth resource scheduling period transmits the reference signal or the reference signal of the resource scheduling period before multiplexing, and can determine the channel stability between each resource scheduling period in the n resource scheduling periods, which is more accurate than a scheme of determining the channel stability based on the variance of SINR. Further, the first communication device may further determine, in combination with at least two of a time domain length of the nth resource scheduling period, a variance of SINR, and a channel difference of every two resource scheduling periods, a reference signal of the resource scheduling period before the nth resource scheduling period is transmitted or multiplexed, so as to further improve transmission reliability while reducing pilot overhead.
In some embodiments, the second communication device receives the reference signal sent by the first communication device or the reference signal indicated by the first communication device based on the nth resource scheduling period, and performs channel estimation to obtain the channel response.
Channel estimation algorithms are classified into two main types of methods, namely time domain and frequency domain, depending on the type of input data. The frequency domain method is mainly aimed at a multi-carrier system; the time domain method is applicable to all single carrier and multi-carrier systems, which estimate the fading coefficients of the multipath components in the fading channel by means of the statistical properties of the reference signal or the transmitted data. From the perspective of channel estimation algorithm prior information, the following three categories can be classified:
(1) Based on an estimate of the reference signal. The algorithm determines parameters to be estimated according to a certain estimation criterion, or gradually tracks and adjusts the estimation value of the parameters to be estimated according to certain criterion. It is characterized by that it needs to use reference signal, i.e. pilot frequency or training sequence. The estimation based on the training sequence and the pilot sequence is collectively referred to as a reference signal based estimation algorithm.
The channel estimation algorithm based on the training sequence is suitable for a system of a burst transmission mode. By transmitting the known training sequence, initial channel estimation is performed at the receiving end, and when useful information data is transmitted, a decision update is performed by using the initial channel estimation result, thereby completing real-time channel estimation. Channel estimation based on pilot symbols is applicable to continuous transmission systems. By inserting known pilot symbols into the transmitted useful data, a channel estimation result of the pilot position can be obtained; then, the channel estimation result of the useful data position is obtained by interpolation by utilizing the channel estimation result of the pilot frequency position, and the channel estimation is completed
(2) Blind estimation. The channel estimation is performed by utilizing some characteristics inherent to the modulated signal and independent of specific bearing information bits, or by adopting a decision feedback method.
(3) Semi-blind estimation. The channel estimation method combines the advantages of the blind estimation method and the training sequence estimation method.
Generally, a method of estimating by designing a training sequence or periodically inserting pilot symbols in data is more common. And the blind estimation and semi-blind channel estimation algorithms do not need or need shorter training sequences, so that the frequency spectrum efficiency is high, and the extensive research is obtained. However, the calculation complexity of the general blind estimation and the semi-blind estimation methods is high, and problems such as phase ambiguity (subspace-based methods), error propagation (such as decision feedback methods), slow convergence or local minimum sinking may occur, and long observation data are required, which limits their practicability to a certain extent.
In some embodiments, the second communication device may estimate other unknown channel responses by interpolation.
For example, after estimating the channel transfer function at the pilot subcarriers, the channel response at the data subcarriers may be obtained by interpolating between adjacent pilot subcarriers. Different interpolation algorithms have different computational complexity and performance, and some commonly used interpolation algorithms are discussed below.
1. Linear interpolation method
Linear interpolation is the use of the channel responses of the 2 pilot subcarriers that are adjacent one after the other to linearly calculate the channel responses on the data subcarriers between them. For the kth subcarrier, a linear interpolation algorithm is adopted, and the frequency domain response of the channel is adopted.
2. Second order interpolation method
The performance of the second order interpolation algorithm is better than that of the linear interpolation. The method utilizes the information of the front and back adjacent 3 pilot frequency subcarriers to carry out second-order interpolation, and obtains the channel frequency domain response of the kth subcarrier.
3. Time domain interpolation method
Is a high-precision interpolation algorithm based on zero padding and DFT/IDFT operation.
In some embodiments, the second communication device performs compensation calibration on the received signal using the channel response estimate. For example, compensation and restoration of waveforms are performed for signal estimates.
The method embodiments of the present application are described in detail above with reference to fig. 3 and 4, and the apparatus embodiments of the present application are described in detail below with reference to fig. 5 to 6, it being understood that the apparatus embodiments and the method embodiments correspond to each other, and similar descriptions may refer to the method embodiments.
Fig. 5 shows a schematic block diagram of a communication device 400 according to an embodiment of the present application. As shown in fig. 5, the communication apparatus 400 includes:
A transceiver unit 410, configured to obtain channel information corresponding to n resource scheduling periods in a time window, where n is an integer greater than 1;
a processing unit 420, configured to determine whether the nth resource scheduling period multiplexes the reference signal of the ith resource scheduling period according to the channel information corresponding to the n resource scheduling periods respectively;
the processing unit 420 is further configured to, in a case where the reference signal of the ith resource scheduling period is multiplexed in the nth resource scheduling period, not transmit the reference signal to the second communication device in the nth resource scheduling period.
In some embodiments, the channel information includes a signal to interference plus noise ratio SINR, and the processing unit 420 is specifically configured to: according to the channel information respectively corresponding to the n resource scheduling periods, determining the variance of SINR corresponding to the n resource scheduling periods; and determining whether the reference signal of the ith resource scheduling period is multiplexed in the nth resource scheduling period according to the variance of the SINR and the first preset value.
In some embodiments, the processing unit 420 is specifically configured to: when the variance of the SINR is smaller than or equal to the first preset value, determining whether the nth resource scheduling period multiplexes the reference signal of the ith resource scheduling period according to the channel difference between every two resource scheduling periods in the n resource scheduling periods and a second preset value; and when the variance of the SINR is larger than the first preset value, determining that the reference signal of the ith resource scheduling period is not multiplexed in the nth resource scheduling period.
In some embodiments, the processing unit 420 is specifically configured to: when the channel difference between every two resource scheduling periods in the n resource scheduling periods is smaller than or equal to the second preset value, determining that the nth resource scheduling period multiplexes the reference signal of the ith resource scheduling period; when the channel difference between at least two resource scheduling periods in the n resource scheduling periods is larger than the second preset value, determining whether the reference signal of the ith resource scheduling period is multiplexed in the nth resource scheduling period according to the channel difference between the second resource scheduling period and the nth resource scheduling period and the second preset value, wherein the second resource scheduling period is the last resource scheduling period of the nth resource scheduling period; or when the channel difference between every two resource scheduling periods in the n resource scheduling periods is larger than the second preset value, determining that the reference signal of the ith resource scheduling period is not multiplexed in the nth resource scheduling period.
In some embodiments, the processing unit 420 is specifically configured to: when the channel difference between the second resource scheduling period and the nth resource scheduling period is smaller than or equal to the second preset value, determining that the nth resource scheduling period multiplexes the reference signal of the ith resource scheduling period; otherwise, determining that the reference signal of the ith resource scheduling period is not multiplexed in the nth resource scheduling period.
In some embodiments, in case it is determined that the nth resource scheduling period multiplexes the reference signal of the ith resource scheduling period, the transceiving unit is further to: transmitting indication information to the second communication device; the indication information is used for indicating the time-frequency resource of the reference signal of the ith resource scheduling period, wherein i is one of the following:
when the channel difference between every two resource scheduling periods in the n resource scheduling periods is smaller than or equal to the second preset value, i=1;
and when the channel difference between at least two resource scheduling periods in the n resource scheduling periods is larger than the second preset value, and the channel difference between the second resource scheduling period and the n resource scheduling period is smaller than or equal to the second preset value, i=n-1.
In some embodiments, the processing unit 420 is specifically configured to: acquiring the time domain length of the nth resource scheduling period; when the time domain length of the nth resource scheduling period is smaller than the preset time domain length, determining whether the nth resource scheduling period multiplexes the reference signal of the ith resource scheduling period according to the channel information respectively corresponding to the nth resource scheduling period; and when the time domain length of the nth resource scheduling period is greater than or equal to the preset time domain length, transmitting a reference signal to the second communication equipment in the nth resource scheduling period.
In some embodiments, the communication device 400 may be specifically a first communication device in the embodiments of the present application, and the communication device 400 may implement a corresponding flow implemented by the first communication device in each method in the embodiments of the present application, which is not described herein for brevity.
Fig. 6 is a schematic block diagram of an apparatus 500 of an embodiment of the present application. The apparatus 500 shown in fig. 6 includes a processor 510, and the processor 510 may call and run a computer program from a memory to implement the methods in the embodiments of the present application.
In some embodiments, as shown in fig. 6, the apparatus 500 may further include a memory 520. Wherein the processor 510 may call and run a computer program from the memory 520 to implement the methods in embodiments of the present application.
Wherein the memory 520 may be a separate device from the processor 510 or may be integrated into the processor 510.
In some embodiments, the apparatus 500 may further include an input interface 530. The processor 510 may control the input interface 530 to communicate with other devices or chips, and in particular, may obtain information or data sent by other devices or chips.
In some embodiments, the apparatus 500 may further include an output interface 540. Wherein the processor 510 may control the output interface 540 to communicate with other devices or chips, and in particular may output information or data to other devices or chips.
In some embodiments, the apparatus may be applied to a terminal device in the embodiments of the present application, and the apparatus may implement a corresponding flow implemented by the first communication device or the second communication device in each method in the embodiments of the present application, which is not described herein for brevity.
In some embodiments, the device mentioned in the embodiments of the present application may also be a chip. For example, a system-on-chip or a system-on-chip, etc.
It should be appreciated that the processor of an embodiment of the present application may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method embodiments may be implemented by integrated logic circuits of hardware in a processor or instructions in software form. The processor may be a general purpose processor, a digital signal processor (Digital Signal Processor, DSP), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), an off-the-shelf programmable gate array (Field Programmable Gate Array, FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components. The disclosed methods, steps, and logic blocks in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present application may be embodied directly in hardware, in a decoded processor, or in a combination of hardware and software modules in a decoded processor. The software modules may be located in a random access memory, flash memory, read only memory, programmable read only memory, or electrically erasable programmable memory, registers, etc. as well known in the art. The storage medium is located in a memory, and the processor reads the information in the memory and, in combination with its hardware, performs the steps of the above method.
It will be appreciated that the memory in embodiments of the present application may be either volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The nonvolatile Memory may be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable EPROM (EEPROM), or a flash Memory. The volatile memory may be random access memory (Random Access Memory, RAM) which acts as an external cache. By way of example, and not limitation, many forms of RAM are available, such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (Double Data Rate SDRAM), enhanced SDRAM (ESDRAM), synchronous DRAM (SLDRAM), and Direct RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to comprise, without being limited to, these and any other suitable types of memory.
It should be understood that the above memory is exemplary but not limiting, and for example, the memory in the embodiments of the present application may be Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), direct RAM (DR RAM), and the like. That is, the memory in embodiments of the present application is intended to comprise, without being limited to, these and any other suitable types of memory.
Embodiments of the present application also provide a computer-readable storage medium for storing a computer program.
In some embodiments, the computer-readable storage medium may be applied to a communication device (e.g., a first communication device or a second communication device) in the embodiments of the present application, and the computer program causes the computer to execute a corresponding procedure implemented by the first communication device or the second communication device in each method of the embodiments of the present application, which is not described herein for brevity.
Embodiments of the present application also provide a computer program product comprising computer program instructions.
In some embodiments, the computer program product may be applied to a network device in the embodiments of the present application, and the computer program instructions cause the computer to execute the corresponding flow implemented by the first communication device or the second communication device in the methods in the embodiments of the present application, which is not described herein for brevity.
The embodiment of the application also provides a computer program.
In some embodiments, the computer program may be applied to the first communication device or the second communication device in the embodiments of the present application, and when the computer program runs on a computer, the computer is caused to execute a corresponding flow implemented by the network device in each method in the embodiments of the present application, which is not described herein for brevity.
In some embodiments, the computer program may be applied to the first communication device or the second communication device in the embodiments of the present application, and when the computer program runs on a computer, the computer is caused to execute a corresponding flow implemented by the first communication device or the second communication device in each method in the embodiments of the present application, which is not described herein for brevity.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. 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 application.
It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, and are not repeated herein.
In the several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in each embodiment of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. For such understanding, the technical solutions of the present application may be embodied in essence or in a part contributing to the prior art or in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes and substitutions are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A communication method, applied to a first communication device, comprising:
channel information corresponding to n resource scheduling periods in a time window is acquired, wherein n is an integer greater than 1;
determining whether the reference signal of the ith resource scheduling period is multiplexed in the nth resource scheduling period according to the channel information respectively corresponding to the n resource scheduling periods, wherein i is an integer greater than or equal to 1 and less than n;
and in the case that the reference signal of the ith resource scheduling period is multiplexed in the nth resource scheduling period, the reference signal is not transmitted to the second communication device in the nth resource scheduling period.
2. The method according to claim 1, wherein the channel information includes a signal-to-interference-and-noise ratio SINR, and the determining whether the reference signal of the ith resource scheduling period is multiplexed in the nth resource scheduling period according to the channel information respectively corresponding to the n resource scheduling periods includes:
According to the channel information respectively corresponding to the n resource scheduling periods, determining the variance of SINR corresponding to the n resource scheduling periods;
and determining whether the reference signal of the ith resource scheduling period is multiplexed in the nth resource scheduling period according to the variance of the SINR and the first preset value.
3. The method of claim 2, wherein the determining whether the reference signal of the ith resource scheduling period is multiplexed with the nth resource scheduling period according to the variance of the SINR and the first preset value comprises:
when the variance of the SINR is smaller than or equal to the first preset value, determining whether the nth resource scheduling period multiplexes the reference signal of the ith resource scheduling period according to the channel difference between every two resource scheduling periods in the n resource scheduling periods and a second preset value;
and when the variance of the SINR is larger than the first preset value, determining that the reference signal of the ith resource scheduling period is not multiplexed in the nth resource scheduling period.
4. The method of claim 3, wherein determining whether the nth resource scheduling period multiplexes the reference signal of the ith resource scheduling period according to the channel difference between every two resource scheduling periods in the n resource scheduling periods and the second preset value comprises:
When the channel difference between every two resource scheduling periods in the n resource scheduling periods is smaller than or equal to the second preset value, determining that the nth resource scheduling period multiplexes the reference signal of the ith resource scheduling period;
when the channel difference between at least two resource scheduling periods in the n resource scheduling periods is larger than the second preset value, determining whether the reference signal of the ith resource scheduling period is multiplexed in the nth resource scheduling period according to the channel difference between the second resource scheduling period and the nth resource scheduling period and the second preset value, wherein the second resource scheduling period is the last resource scheduling period of the nth resource scheduling period; or alternatively, the process may be performed,
and when the channel difference between every two resource scheduling periods in the n resource scheduling periods is larger than the second preset value, determining that the reference signal of the ith resource scheduling period is not multiplexed in the nth resource scheduling period.
5. The method of claim 4, wherein determining whether the nth resource scheduling period multiplexes the reference signal of the ith resource scheduling period according to the channel difference between the second resource scheduling period and the nth resource scheduling period and the second preset value comprises:
When the channel difference between the second resource scheduling period and the nth resource scheduling period is smaller than or equal to the second preset value, determining that the nth resource scheduling period multiplexes the reference signal of the ith resource scheduling period;
otherwise, determining that the reference signal of the ith resource scheduling period is not multiplexed in the nth resource scheduling period.
6. The method according to claim 5, wherein in case it is determined that the nth resource scheduling period multiplexes the reference signal of the ith resource scheduling period, the method further comprises:
transmitting indication information to the second communication device; the indication information is used for indicating time-frequency resources of the reference signal of the ith resource scheduling period, and i is one of the following:
when the channel difference between every two resource scheduling periods in the n resource scheduling periods is smaller than or equal to the second preset value, i=1;
and when the channel difference between at least two resource scheduling periods in the n resource scheduling periods is larger than the second preset value, and the channel difference between the second resource scheduling period and the n resource scheduling period is smaller than or equal to the second preset value, i=n-1.
7. The method according to any one of claims 1 to 6, wherein determining whether the reference signal of the ith resource scheduling period is multiplexed in the nth resource scheduling period according to the channel information respectively corresponding to the n resource scheduling periods includes:
acquiring the time domain length of the nth resource scheduling period;
when the time domain length of the nth resource scheduling period is smaller than the preset time domain length, determining whether the nth resource scheduling period multiplexes the reference signal of the ith resource scheduling period according to the channel information respectively corresponding to the nth resource scheduling period;
and when the time domain length of the nth resource scheduling period is greater than or equal to the preset time domain length, transmitting a reference signal to the second communication equipment in the nth resource scheduling period.
8. A communication device, comprising:
the receiving and transmitting unit is used for acquiring channel information corresponding to n resource scheduling periods in a time window respectively, wherein n is an integer greater than 1;
the processing unit is used for determining whether the nth resource scheduling period multiplexes the reference signal of the ith resource scheduling period according to the channel information respectively corresponding to the n resource scheduling periods, wherein i is an integer greater than or equal to 1 and less than n;
The processing unit is further configured to, in a case where the reference signal of the ith resource scheduling period is multiplexed in the nth resource scheduling period, not transmit the reference signal to the second communication device in the nth resource scheduling period.
9. A communication device, characterized by a processor and a memory for storing a computer program, said processor being adapted to invoke and run the computer program stored in said memory for performing the method according to any of claims 1 to 7.
10. A computer readable storage medium storing computer program instructions for causing a computer to perform the method of any one of claims 1 to 7.
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