CN116648873A

CN116648873A - Method and device for determining reference signal sequence

Info

Publication number: CN116648873A
Application number: CN202080108125.XA
Authority: CN
Inventors: 柴晓萌; 吴艺群
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2020-12-31
Filing date: 2020-12-31
Publication date: 2023-08-25
Also published as: WO2022141579A1

Abstract

The application discloses a method and a device for determining a reference signal sequence, wherein the method comprises the following steps: the access network equipment maps a plurality of complex values to time-frequency resources of a downlink physical channel, and the complex values are determined according to a reference signal sequence; the downlink physical channel is then transmitted. The terminal device receives a downlink physical channel and then obtains a first reference signal sequence based on a plurality of complex values received from the downlink physical channel. According to the technical scheme provided by the application, when the reference signal sequence is an unstructured sequence, the terminal equipment can still obtain the reference signal sequence.

Description

Method and device for determining reference signal sequence

Technical Field

The present application relates to the field of communications technologies, and in particular, to a method and an apparatus for determining a reference signal sequence.

Background

Generally, before a base station schedules a terminal device for transmission, the base station needs to perform channel estimation, so as to decide on which time-frequency resources to schedule the terminal device and with which modulation and coding strategy (modulation and coding scheme, MCS) to schedule the terminal device, etc. according to the estimated channel. In addition, the base station also needs to perform channel estimation on the channel on which the data is transmitted, before demodulating the data, thereby performing data demodulation using the estimated channel. In channel estimation, a reference signal (which may also be referred to as a pilot signal) is typically used for channel estimation because both the terminal device and the base station need to acquire a transmission signal in advance.

For example, taking a single-shot system as an example, the received signal Y may be denoted as y=s×h+n. Where S is used to represent the reference signal sequence, H is used to represent the channel response, and n is used to represent gaussian noise. The channel estimation process is a process of estimating a channel response H from the received signal Y and the reference signal sequence S. Therefore, in performing channel estimation, it is required for the terminal device and the base station to acquire the reference signal sequence S in advance. For example, the base station and the terminal device may employ a structured reference signal sequence, and the reference signal sequence may employ a gold sequence or a ZC (Zadoff-Chu) sequence, etc. In order to ensure that the correlation between the reference signals of different terminal devices is as low as possible, the number of terminal devices on the same time-frequency resource is often limited, and at the same time, the orthogonal ports supported by the structured reference signal sequence are limited, so that the unstructured reference signal sequence needs to be used.

However, the unstructured reference signal sequence cannot be generated using a formula, and the reference signal sequence cannot be allocated to the UE in the above-described reference signal sequence allocation manner.

Disclosure of Invention

The embodiment of the application provides a method and a device for determining a reference signal sequence, which can ensure that terminal equipment can still obtain the reference signal sequence when the reference signal sequence is an unstructured sequence.

In a first aspect, an embodiment of the present application provides a method for determining a reference signal sequence, the method including:

receiving a downlink physical channel, wherein the downlink physical channel carries a reference signal sequence; and obtaining a first reference signal sequence from a plurality of complex values received from the downlink physical channel.

The complex value is a number shaped as z=a+bi, where a and b are both real numbers, a is referred to as the real part, b is referred to as the imaginary part, and i is referred to as the imaginary unit. The imaginary part of z may be 0, in which case the complex value may also be referred to as a real number. Alternatively, the imaginary part of z may be other than 0 and the real part 0, in which case the complex value may also be referred to as the pure imaginary number. Alternatively, the real part of z is not 0 and the imaginary part is not 0. Therefore, the embodiment of the present application is not limited to the specific value of the complex value.

In the embodiment of the present application, the complex value may also be referred to as a complex value symbol or a complex value element (complex value symbol), and the specific name of the complex value is not limited in the embodiment of the present application. In any case, the complex value may be a complex value received by the terminal device from the downlink physical channel. The downlink physical channel carries a reference signal sequence, which can be understood as: the downlink physical channel carries complex values determined from a reference signal sequence. The first reference signal sequence may be understood as a reference signal sequence obtained by the terminal device according to a plurality of complex values. The first reference signal sequence may also be understood as a reference signal sequence allocated by the access network device to the terminal device, that is, both the access network device and the terminal device may use the first reference signal sequence to perform operations such as channel estimation, channel measurement, or time synchronization.

It can be understood that the downlink physical channel carrying reference signal sequence indicates a reference signal sequence sent by the downlink physical channel carrying access network device to the terminal device, that is, a reference signal sequence which needs to be obtained by the terminal device and is used for subsequent operations such as channel estimation, channel measurement and the like. For example, the reference signal sequence may refer to a reference signal sequence that is not the downlink physical channel itself, such as the DMRS of the PDSCH as in fig. 4 a-4 c. For this description, the following applies equally when reference is made to the related embodiments in which the downlink physical channel carries a reference signal sequence.

In general, the terminal device may determine the reference signal sequence according to a fixed formula, and receive parameters related to generating the reference signal sequence (i.e., parameters in the formula) from the access network device. However, for unstructured reference signal sequences, since the unstructured reference signal sequences cannot be generated by a formula, the terminal device cannot obtain the reference signal sequences by using a fixed formula, parameters, and the like. However, in the technical solution provided in the embodiment of the present application, even if the reference signal sequence is an unstructured reference signal sequence, the terminal device may still obtain the first reference signal sequence through the multiple complex values, thereby improving the problem that the terminal device cannot effectively obtain the unstructured reference signal sequence.

In one possible implementation, the method further includes: receiving configuration information of the reference signal sequence; the obtaining a first reference signal sequence from a plurality of complex values received from the downlink physical channel includes: and obtaining the first reference signal sequence according to a plurality of complex values received from the downlink physical channel and the configuration information.

In the embodiment of the application, the configuration information of the reference signal sequence is the configuration information related to the reference signal sequence, and the terminal equipment can accurately and reliably obtain the first reference signal sequence according to the configuration information.

In one possible implementation, the configuration information includes a first allocation.

In the embodiment of the application, the terminal equipment can obtain the first reference signal sequence according to the first allocation mode and a plurality of complex values received on the downlink physical channel.

In one possible implementation, the obtaining the first reference signal sequence from a plurality of complex values received on the downlink physical channel includes: determining the channel response of the downlink physical channel according to the reference signal of the downlink physical channel; and obtaining the first reference signal sequence according to a plurality of complex values received on the downlink physical channel and the channel response of the downlink physical channel.

Optionally, obtaining the first reference signal sequence according to the plurality of complex values received on the downlink physical channel and the channel response of the downlink physical channel includes: and obtaining a plurality of complex values carried by the downlink physical channel according to the plurality of complex values received on the downlink physical channel and the channel response of the downlink physical channel, and obtaining a first reference signal sequence according to the plurality of complex values carried by the downlink physical channel. That is, the plurality of complex values of the downlink physical channel bearer obtained by the terminal device can be understood as: a plurality of complex values sent out by the access network device; or when the access network equipment sends the downlink physical channel, the access network equipment carries a plurality of complex values in the downlink physical channel. Thus, the terminal device may obtain the first reference signal sequence according to a plurality of complex values carried by the downlink physical channel. For example, the terminal device may obtain the first reference signal sequence according to multiple repetitions of the reference signal sequence and multiple complex values carried by the downlink physical channel. For another example, the terminal device may further obtain the first reference signal sequence according to the mapping order of the reference signal sequence and a plurality of complex values carried by the downlink physical channel, which will not be described in detail herein. It will be appreciated that the following applies equally to the description of the plurality of complex values received from the downlink physical channel and the plurality of complex values carried in the downlink physical channel recovered by the UE.

In the embodiment of the present application, the access network device may directly map a plurality of complex values (i.e., the complex values may be determined according to the reference signal sequence, i.e., the complex values may be determined according to the element values of the reference signal sequence, i.e., the complex values are the element values in the reference signal sequence) onto the time-frequency resources of the downlink physical channel. In this case, the multiple complex values sent by the access network device may experience channel response, so after the terminal device receives the downlink physical channel, the terminal device may determine the channel response of the downlink physical channel according to the reference signal of the downlink physical channel, and then determine the first reference signal sequence according to the channel response and the multiple received complex values. I.e. the first reference signal sequence may be obtained from the channel response of the downlink physical channel and a plurality of complex values received on the downlink physical channel.

It will be appreciated that the terminal device may obtain the first reference signal sequence directly in accordance with the method described above. Alternatively, the terminal device may further obtain the first reference signal sequence according to the configuration information. The terminal device may also obtain the first reference signal sequence according to an allocation manner of the reference signal sequence, a channel response of the downlink physical channel, and a plurality of complex values received on the downlink physical channel. The allocation manner of the reference signal sequences shown here may be used to indicate that the terminal device needs to obtain the first reference signal sequence according to the channel response of the downlink physical channel. Alternatively, the allocation manner of the reference signal sequence shown here is used to indicate that the element values in the reference signal sequence are directly mapped on resource elements (resource elements, REs) of the downlink physical channel.

In one possible implementation manner, the obtaining the first reference signal sequence according to the plurality of complex values received from the downlink physical channel includes: performing demodulation processing and decoding processing on a plurality of complex values received from the downlink physical channel to obtain a decoding result; and determining the first reference signal sequence according to the coding result.

In the embodiment of the present application, the access network device may obtain a plurality of complex values after each element value in the reference signal sequence is subjected to coding processing and modulation processing. Under the situation, the complex value sent out by the access network equipment can experience channel response, after the terminal equipment receives the downlink physical channel, the terminal equipment not only needs to determine the channel response of the downlink physical channel, but also obtains a plurality of complex values carried in the downlink physical channel according to the channel response of the downlink physical channel and a plurality of complex values received from the downlink physical channel; and the multiple complex values carried by the downlink physical channel are required to be demodulated and decoded to obtain a decoding result, so that a first reference signal sequence is obtained according to the decoding result.

It will be appreciated that the terminal device may obtain the first reference signal sequence directly in accordance with the method described above. Alternatively, the terminal device may further obtain the first reference signal sequence according to the configuration information. The terminal device may also obtain the first reference signal sequence according to the allocation manner of the reference signal sequence, the decoding result, and the channel response of the downlink physical channel. The allocation manner of the reference signal sequences shown here may be used to indicate that the terminal device needs to obtain the first reference signal sequence according to the decoding result after undergoing demodulation processing and decoding processing. Alternatively, the allocation of the reference signal sequences shown herein is used to indicate that the reference signal sequences are transmitted in accordance with the transmission of data or control information. Alternatively, the allocation manner of the reference signal sequence shown here is used to indicate that multiple complex values (i.e. multiple complex values carried in the downlink physical channel when the access network device sends the downlink physical channel) are obtained after the coding process and the modulation process.

In one possible implementation, the element values in the first reference signal sequence are complex values received from the downlink physical channel.

In the embodiment of the application, the access network equipment can preprocess each element value in the reference signal sequence according to the estimated channel response between the access network equipment and the terminal equipment, so as to obtain a plurality of complex values. In this case, although the plurality of complex values transmitted by the access network device may experience the channel response, since the plurality of complex values transmitted by the access network device are preprocessed, the terminal device may directly use the received complex values as the element values in the first reference signal sequence.

It will be appreciated that the terminal device may obtain the first reference signal sequence directly in accordance with the method described above. Alternatively, the terminal device may further obtain the first reference signal sequence according to the configuration information. The terminal device may also obtain the first reference signal sequence according to an allocation manner of the reference signal sequence and a plurality of complex values received from the downlink physical channel. The allocation of the reference signal sequences shown here may be used to indicate that the terminal device may directly take the received plurality of complex values as element values in the first reference signal sequence. I.e. the allocation of the reference signal sequences shown here may be used to indicate that the terminal device does not need to obtain the first reference signal sequence from the channel response of the downlink physical channel. Alternatively, the allocation manner of the reference signal sequence shown herein may be used to indicate that a plurality of complex values (i.e., when the access network device sends the downlink physical channel, the plurality of complex values carried in the downlink physical channel) are mapped on REs of the downlink physical channel after being preprocessed.

It will be appreciated that the above-described element values in the first reference signal sequence are a plurality of complex values received in the downlink physical channel can also be understood as: the element value in the first reference signal sequence is a complex value received in a Resource Element (RE) of the downlink physical channel.

In one possible implementation manner, the obtaining the first reference signal sequence according to the plurality of complex values received from the downlink physical channel includes: obtaining a plurality of complex values carried by the downlink physical channel according to the complex values received from the downlink physical channel; judging a complex value carried by the downlink physical channel as a preset value; and determining the first reference signal sequence according to preset values corresponding to a plurality of complex values carried by the downlink physical channel.

In the embodiment of the present application, the access network device may obtain a plurality of complex values after performing quantization processing on each element value in the reference signal sequence. In this case, even if the plurality of complex values transmitted by the access network device undergo channel response, the plurality of complex values received by the terminal device are caused to be different from the plurality of complex values transmitted by the access network device. The terminal device may still determine the complex values carried in the downlink physical channel based on the channel response and the complex values received from the downlink physical channel. And then, according to a judging method, judging each complex value carried in the downlink physical channel as a preset value. Therefore, the terminal equipment can determine the first reference signal sequence according to the preset values corresponding to the complex values carried by the downlink physical channel. The preset value may comprise a preset discrete value, e.g. the terminal device may decide each received complex value as a preset discrete value. The number of the preset values is not limited in the embodiment of the application.

In one possible implementation manner, the obtaining the first reference signal sequence according to the plurality of complex values received from the downlink physical channel includes: judging a complex value received from a downlink physical channel as a preset value; and determining the first reference signal sequence according to preset values corresponding to a plurality of complex values received in the downlink physical channel.

In the embodiment of the application, the access network equipment not only can carry out quantization processing on each element value in the reference signal sequence, but also can obtain preset values corresponding to a plurality of element values in the reference signal sequence. The method may further comprise preprocessing the preset values corresponding to the plurality of element values according to the first channel response, so as to obtain a plurality of complex values. In this case, the terminal device may directly perform decision on one complex value received from the downlink physical channel, to obtain a preset value corresponding to each complex value; and then determining a first reference signal sequence according to preset values corresponding to a plurality of complex values received from the downlink physical channel. It can be understood that the access network device may first perform quantization processing on each element value in the reference signal sequence to obtain preset values corresponding to a plurality of element values, and then perform preprocessing on the preset values corresponding to each element value according to a channel response between the access network device and the terminal device to obtain a plurality of complex values.

It will be appreciated that the terminal device may obtain the first reference signal sequence directly in accordance with the method described above. Alternatively, the terminal device may further obtain the first reference signal sequence according to the configuration information. The terminal device may also obtain the first reference signal sequence according to an allocation manner of the reference signal sequence and a plurality of complex values (including a plurality of complex values received from a downlink physical channel or a plurality of complex values carried in the downlink physical channel). The allocation of the reference signal sequences shown here may be used to indicate that the terminal device needs to decide each complex value as a preset value. Alternatively, the allocation of the reference signal sequences shown here may be used to indicate that the complex values are quantized and then mapped to REs of the downlink physical channel.

In one possible implementation, the downlink physical channel carries multiple repetitions of the reference signal sequence.

In the embodiment of the application, the downlink physical channel can improve the condition that the first reference signal sequence determined by the terminal equipment is inaccurate because the element value of the reference signal sequence is received by mistake by carrying the repeated reference signal sequence for a plurality of times, thereby improving the reliability of the terminal equipment for obtaining the first reference signal sequence.

In a possible implementation manner, the configuration information further includes any one or more of the following information:

the time-frequency resource of the downlink physical channel, the mapping sequence of the reference signal sequence on the downlink physical channel, the repetition number of the reference signal sequence on the downlink physical channel, the length of the reference signal sequence, the use configuration of the reference signal sequence or the effective time of the reference signal sequence;

the mapping sequence of the reference signal sequence on the downlink physical channel comprises the following steps: the reference signal sequence is mapped on the downlink physical channel in the sequence of the first frequency domain and the second time domain, or the reference signal sequence is mapped on the downlink physical channel in the sequence of the first time domain and the second time domain;

the usage configuration of the reference signal sequence includes any one or more of the following information: the time-frequency resource occupied by the reference signal sequence on the downlink physical channel, the configuration type of the reference signal sequence or the port configuration of the reference signal sequence.

In one possible implementation, the method further includes: transmitting an uplink signal according to the first reference signal sequence; or receiving a downlink signal according to the first reference signal sequence.

In the embodiment of the application, after the terminal equipment obtains the first reference signal sequence, the first reference signal sequence can be sent to the access network equipment, so that the access network equipment can estimate the channel response between the terminal equipment and the access network equipment according to the first reference signal sequence. Or after the terminal device obtains the first reference signal sequence, operations such as channel estimation, channel measurement or time synchronization can be performed according to the first reference signal sequence.

In one possible implementation, the reference signal sequence includes any one of a demodulation reference signal (demodulation reference signal, DMRS) sequence, a sounding reference signal (sounding reference signal, SRS) sequence, or a channel state information reference signal (channel state information-reference signal, CSI-RS) sequence.

In a second aspect, an embodiment of the present application provides a method for determining a reference signal sequence, the method including:

mapping a plurality of complex values to time-frequency resources of a downlink physical channel, wherein the complex values are determined according to a reference signal sequence; and transmitting the downlink physical channel.

In the embodiment of the present application, after the access network device determines the complex value according to the reference signal sequence, the access network device may map the complex values onto the time-frequency resource of the downlink physical channel. The above-mentioned transmitting downlink physical channel can be understood as: and transmitting the downlink physical channel through the time-frequency resource.

In one possible implementation, the method further includes: and transmitting configuration information of the reference signal sequence.

In a possible implementation manner, the configuration information includes an allocation manner of the reference signal sequence.

In one possible implementation, the downlink physical channel carries a reference signal of the downlink physical channel, where the reference signal of the downlink physical channel is used to determine a channel response of the downlink physical channel.

In one possible implementation manner, the mapping the plurality of complex values to the time-frequency resources of the downlink physical channel includes: performing coding processing and modulation processing on each element value in the reference signal sequence to obtain a plurality of complex values; and mapping the complex values to time-frequency resources of the downlink physical channels.

In one possible implementation manner, the mapping the plurality of complex values to the time-frequency resources of the downlink physical channel includes: processing each element value in the reference signal sequence according to a first channel response, wherein the first channel response is a channel response to be experienced by the downlink physical channel; and mapping the complex values to time-frequency resources of a downlink physical channel.

In one possible implementation manner, the mapping the plurality of complex values to the time-frequency resources of the downlink physical channel includes: quantizing an element value in the reference signal sequence to a preset value; obtaining a plurality of complex values according to preset values corresponding to a plurality of element values in the reference signal sequence; and mapping the complex values to time-frequency resources of a downlink physical channel.

In the embodiment of the present application, the downlink physical channel carries multiple repetitions of the reference signal sequence, which can also be understood as: the downlink physical channel carries multiple repetitions of the plurality of complex values. That is, the downlink physical channel may carry multiple repetitions of multiple complex values determined from the reference signal sequence.

In a possible implementation manner, the configuration information further includes any one or more of the following information: the time-frequency resource of the downlink physical channel, the mapping sequence of the reference signal sequence on the downlink physical channel, the repetition number of the reference signal sequence on the downlink physical channel, the length of the reference signal sequence, the use configuration of the reference signal sequence or the effective time of the reference signal sequence;

The mapping sequence of the reference signal sequence on the downlink physical channel comprises the following steps: the reference signal sequence is mapped on the downlink physical channel in the sequence of the first frequency domain and the second time domain, or the reference signal sequence is mapped on the downlink physical channel in the sequence of the first time domain and the second time domain; the usage configuration of the reference signal sequence includes any one or more of the following information: the time-frequency resource occupied by the reference signal sequence on the downlink physical channel, the configuration type of the reference signal sequence or the port configuration of the reference signal sequence.

In one possible implementation, the reference signal sequence includes any one of a DMRS sequence, an SRS sequence, or a CSI-RS sequence.

It is to be understood that, for the description and advantages of the second aspect, reference may be made to the description and advantages of the first aspect, which are not repeated here.

In a third aspect, embodiments of the present application provide a communication device for performing the method of the first aspect or any possible implementation of the first aspect. The communication device comprises a device with means for performing the method of the first aspect or any possible implementation of the first aspect.

The communication device comprises a processing unit and a transceiver unit.

In a fourth aspect, embodiments of the present application provide a communications apparatus for performing the method of the second aspect or any possible implementation of the second aspect. The communication device comprises means with means for performing the second aspect or any possible implementation of the second aspect.

The communication device comprises a processing unit and a transceiver unit.

In a fifth aspect, an embodiment of the present application provides a communication device, including a processor, configured to perform the method described in the first aspect or any possible implementation manner of the first aspect. Alternatively, the processor is configured to execute computer-executable instructions stored in the memory such that the method of the first aspect or any possible implementation of the first aspect is performed.

In performing the above method, the process of transmitting information (e.g., transmitting an uplink signal) or receiving information (e.g., receiving a downlink physical channel or configuration information, etc.) in the above method may be understood as a process of outputting the above information by a processor or a process of receiving the above information input by a processor. When outputting the information, the processor outputs the information to the transceiver for transmission by the transceiver. This information, after being output by the processor, may also require additional processing before reaching the transceiver. Similarly, when the processor receives the input of the information, the transceiver receives the information and inputs it to the processor. Further, after the transceiver receives the information, the information may need to be further processed before being input to the processor.

Based on the above principle, for example, the received downlink physical channel mentioned in the foregoing method may be understood as a processor input downlink physical channel. Alternatively, receiving configuration information may be understood as the processor entering configuration information. Alternatively, transmitting the upstream signal may be understood as the processor outputting the upstream signal.

With respect to operations such as transmitting, sending, and receiving, etc., that are referred to by a processor, unless otherwise specified, or if not contradicted by actual or inherent logic in the relevant description, operations such as processor output and input may be more generally understood than transmitting, sending, and receiving operations that are directly performed by radio frequency circuitry and antennas.

In implementation, the processor may be a processor dedicated to performing the methods, or may be a processor that executes computer instructions in a memory to perform the methods, such as a general-purpose processor. The memory may be a non-transitory (non-transitory) memory, such as a Read Only Memory (ROM), which may be integrated on the same chip as the processor, or may be separately provided on different chips, and the type of the memory and the manner in which the memory and the processor are provided are not limited in the embodiments of the present application.

In one possible implementation, the memory is located outside the communication device.

In one possible implementation, the memory is located within the communication device.

In embodiments of the present application, the processor and the memory may also be integrated in one device, i.e., the processor and the memory may also be integrated.

In a possible implementation, the communication device further comprises a transceiver for receiving signals and/or transmitting signals.

For example, the transceiver may be configured to receive configuration information sent by the access network device. Alternatively, the transceiver may be configured to receive a downlink physical channel or the like transmitted by the access network device.

In a sixth aspect, an embodiment of the present application provides a communications device, including a processor, configured to perform the method of the second aspect or any possible implementation manner of the second aspect. Alternatively, the processor is configured to execute computer-executable instructions stored in the memory such that the method of the second aspect or any possible implementation of the second aspect described above is performed.

In performing the above method, the process of transmitting information (e.g., transmitting a downlink physical channel, or transmitting configuration information) or receiving information (e.g., receiving an uplink signal) in the above method may be understood as a process of outputting the above information by a processor and a process of receiving the above information by the processor. When outputting the information, the processor outputs the information to the transceiver for transmission by the transceiver. This information, after being output by the processor, may also require additional processing before reaching the transceiver. Similarly, when the processor receives the input of the information, the transceiver receives the information and inputs it to the processor. Further, after the transceiver receives the information, the information may need to be further processed before being input to the processor.

Based on the above principle, for example, the transmitting downlink physical channel mentioned in the foregoing method may be understood as the processor outputting the downlink physical channel. Alternatively, sending the configuration information may be understood as the processor outputting the configuration information. Alternatively, receiving the upstream signal may be understood as the processor inputting the upstream signal.

With respect to operations such as transmitting, sending, and receiving, etc., that are referred to by a processor, unless otherwise specified, or if not contradicted by actual or inherent logic in the relevant description, the operations such as outputting and receiving, inputting, etc., by the processor are more generally understood as being operations such as transmitting, sending, and receiving, rather than directly by radio frequency circuitry and antennas.

In implementation, the processor may be a processor dedicated to performing the methods, or may be a processor that executes computer instructions in a memory to perform the methods, e.g., a general purpose processor. The memory may be a non-transitory (non-transitory) memory, such as a Read Only Memory (ROM), which may be integrated on the same chip as the processor, or may be separately provided on different chips, and the type of the memory and the manner in which the memory and the processor are provided are not limited in the embodiments of the present application.

For example, the transceiver may be configured to transmit downlink physical channels or configuration information, etc., to the terminal device.

In a seventh aspect, an embodiment of the present application provides a communication device, including a logic circuit and an interface, where the logic circuit is coupled to the interface, and the interface is configured to input a downlink physical channel; the logic circuit is configured to obtain a first reference signal sequence according to a plurality of complex values received from the downlink physical channel.

In a possible implementation, the interface is further configured to input configuration information of the reference signal sequence.

In a possible implementation manner, the interface is further configured to input a downlink signal and/or output an uplink signal according to the first reference signal sequence.

It will be appreciated that the description of the relation between complex values and the first reference signal sequence, configuration information etc. may also be referred to the description of the first aspect and will not be described in detail here.

In an eighth aspect, an embodiment of the present application provides a communication device, including a logic circuit and an interface, where the logic circuit is coupled to the interface, and the logic circuit is configured to map a plurality of complex values to time-frequency resources of a downlink physical channel, where the plurality of complex values are determined according to a reference signal sequence; the interface is configured to output the downlink physical channel.

In a possible implementation manner, the interface is further configured to output configuration information of the reference signal sequence.

In a possible implementation manner, the interface is further configured to input an uplink signal and/or output a downlink signal according to the first reference signal sequence.

In a ninth aspect, embodiments of the present application provide a computer readable storage medium for storing a computer program which, when run on a computer, causes the method of the first aspect or any of the possible implementations of the first aspect to be performed; alternatively, the method as shown in the second aspect or any possible implementation of the second aspect is performed.

In a tenth aspect, embodiments of the present application provide a computer program product comprising a computer program or computer code which, when run on a computer, causes the method shown in the first aspect or any of the possible implementations of the first aspect to be performed; alternatively, the method as shown in the second aspect or any possible implementation of the second aspect is performed.

In an eleventh aspect, embodiments of the present application provide a computer program which, when run on a computer, performs the method of the first aspect or any possible implementation of the first aspect; alternatively, the method of the second aspect or any possible implementation of the second aspect is performed.

In a twelfth aspect, an embodiment of the present application provides a wireless communication system, where the wireless communication system includes a terminal device and an access network device, where the terminal device is configured to perform a method as shown in the first aspect or any possible implementation manner of the first aspect, and the access network device is configured to perform a method as shown in the second aspect or any possible implementation manner of the second aspect.

Drawings

Fig. 1 is a schematic diagram of a communication system according to an embodiment of the present application;

fig. 2a is a schematic flow chart of channel estimation according to an embodiment of the present application;

fig. 2b is a schematic flow chart of a reference signal sequence allocation according to an embodiment of the present application;

fig. 3 is a flowchart of a method for determining a reference signal sequence according to an embodiment of the present application;

fig. 4a to fig. 4c are schematic diagrams illustrating the result of mapping a DMRS sequence onto a physical downlink shared channel (physical downlink share channel, PDSCH) according to an embodiment of the present application;

fig. 5a and fig. 5b are schematic diagrams illustrating a result of mapping a DMRS sequence to a PDSCH according to an embodiment of the present application;

fig. 6 is a flowchart of a method for determining a reference signal sequence according to an embodiment of the present application;

fig. 7 to 9 are schematic structural diagrams of a communication device according to an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings.

The terms first and second and the like in the description, the claims and the drawings of the present application are used for distinguishing between different objects and not for describing a particular sequential order. Furthermore, the terms "comprising," "including," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion. Such as a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to the list of steps or elements but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly understand that the embodiments described herein may be combined with other embodiments.

In the present application, "at least one (item)" means one or more, "a plurality" means two or more, "at least two (items)" means two or three and more, "and/or" for describing an association relationship of an association object, and three kinds of relationships may exist, for example, "a and/or B" may represent: only a, only B and both a and B cases. The character "/" generally indicates that the context-dependent object is an "or" relationship. "at least one of (a) or a similar expression thereof means any combination of these items. For example, at least one (one) of a, b or c may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c".

The technical scheme provided by the application can be applied to various communication systems, such as: long term evolution (long term evolution, LTE) systems, LTE frequency division duplex (frequency division duplex, FDD) systems, LTE time division duplex (time division duplex, TDD), internet of things (internet of things, ioT) systems, narrowband internet of things (NB-IoT) systems, wireless fidelity (wireless fidelity, wiFi), fifth generation (5th generation,5G) communication systems or New Radio (NR), and other communication systems in the future, and the like. Further, the communication system comprises an access network device and a terminal device, and the terminal device can be in the coverage area of the access network device. In the communication system, the terminal equipment and the access network equipment can interact, for example, the terminal equipment sends an uplink signal to the access network equipment, and the access network equipment sends a downlink signal to the terminal equipment.

The technical scheme provided by the application can be also applied to machine type communication (machine type communication, MTC), inter-machine communication long term evolution (long term evolution-machine, LTE-M), device-to-device (D2D) network, machine-to-machine (machine to machine, M2M) network, internet of things (internet of things, ioT) network or other networks. The IoT network may include, for example, an internet of vehicles. The communication modes in the internet of vehicles system are generally called as vehicles and anything (V2X, X may represent anything), for example, the V2X may include: vehicle-to-vehicle (vehicle to vehicle, V2V) communication, vehicle-to-infrastructure (vehicle to infrastructure, V2I) communication, vehicle-to-pedestrian communication (vehicle to pedestrian, V2P) or vehicle-to-network (vehicle to network, V2N) communication, etc. By way of example, in fig. 1 shown below, the terminal device and the terminal device may communicate via D2D technology, M2M technology, V2X technology, or the like.

The following detailed description of the application refers to the terminology.

1. Terminal equipment

The terminal equipment in the application is a device with wireless receiving and transmitting functions. The terminal device may communicate with access network devices (or may also be referred to as access devices or network devices, etc.) in a radio access network (radio access network, RAN).

A terminal device may also be called a User Equipment (UE), an access terminal, a terminal (terminal), a subscriber unit (subscriber unit), a subscriber station, a mobile station, a remote terminal, a mobile device, a user terminal, a user agent, a user equipment, or the like. In one possible implementation, the terminal device may be deployed on land, including indoors or outdoors, hand-held or vehicle-mounted; can also be deployed on the water surface (such as ships, etc.); but may also be deployed in the air (e.g., on aircraft, balloon, satellite, etc.). In one possible implementation manner, the terminal device may be a handheld device, an in-vehicle device, a wearable device, a sensor, a terminal in the internet of things, a fifth generation (5th generation,5G) network, a terminal device in any form in a future network, and the like, which is not limited in the present application.

For convenience of description, various embodiments provided by the present application will be described below with reference to a UE.

2. Access network device

The access network device in the application can be a device which is deployed in a wireless access network and provides wireless communication service for terminal equipment. The access network device may also be referred to as AN access device or (R) AN device or network device, etc.

The access network device may include, but is not limited to: a next generation base station (next generation node basestation, gNB) in the 5G system, an evolved node B (eNB) in the LTE system, a radio network controller (radio network controller, RNC), a Node B (NB), a base station controller (base station controller, BSC), a base transceiver station (base transceiver station, BTS), a home base station (home evolved nodeB, or home node B, HNB), a baseband unit (BBU), a transmission reception point (transmitting and receiving point, TRP), a transmission point (transmitting point, TP), a small base station device (pico), a mobile switching center, or a network device in a future network, and the like. The access network device may also be a device carrying a base station function in D2D, V X or M2M, etc., and the specific type of the access network device is not limited in the present application. In systems of different radio access technologies, the names of access network device capable devices may vary.

Alternatively, in some deployments of the access network device, the access network device may include a Centralized Unit (CU), a Distributed Unit (DU), and the like. In other deployments of access network devices, CUs may also be divided into CU-Control Plane (CP) and CU-User Plane (UP), etc. In still other deployments of the access network device, the access network device may also be an open radio access network (open radio access network, ora) architecture, etc., and the specific deployment manner of the access network device is not limited by the present application.

Based on the terminal device and the access network device described above, the embodiment of the application provides a communication system. Fig. 1 is a schematic diagram of a communication system according to an embodiment of the present application. As shown in fig. 1, the communication system may include at least one access network device, such as the base station in fig. 1, and at least one terminal device, such as UE1 to UE6 in fig. 1. In the communication system, the access network device may send downlink signals such as configuration information or PDSCH to the UEs 1 to 6, and the UEs 1 to 6 may send uplink signals to the access network device, and the access network device may also receive the uplink signals.

For example, the terminal devices may communicate directly with each other. Direct communication between the terminal devices may be achieved, for example, by D2D technology. As shown in fig. 1, between UE4 and UE5, and between UE4 and UE6, direct communication may be performed using D2D technology. UE4 or UE6 may communicate with UE5 alone or simultaneously. As another example, UEs 4 to 6 may also communicate with the access network device, respectively. Such as UE4 or UE6, may communicate directly with the access network device or may communicate indirectly with the access network device, such as UE6 may communicate with the access network device via UE 5.

It will be appreciated that fig. 1 illustrates schematically one access network device and a plurality of terminal devices, and communication links between the communication devices. Alternatively, the communication system may comprise a plurality of access network devices, and the coverage area of each access network device may comprise other numbers of terminal devices, e.g. more or fewer terminal devices. The application is not limited in this regard.

Each of the above-described communication apparatuses, such as the base station, UE1 to UE6 in fig. 1, may be configured with a plurality of antennas. The plurality of antennas may include at least one transmitting antenna for transmitting signals, at least one receiving antenna for receiving signals, and the like, and the specific structure of each communication device is not limited in the embodiment of the present application. Optionally, the communication system may further include a network controller, a mobility management entity, and other network entities, which the embodiments of the present application are not limited to.

It can be appreciated that, for the communication system to which the method for determining a reference signal sequence provided by the present application is applicable, the description is omitted below. For convenience of description, various embodiments provided by the present application will be described below with reference to a base station.

3. Reference signal

The reference signal may be used for channel estimation, channel measurement, time synchronization, or frequency synchronization by the receiving end device. The reference signal may be, for example, a signal that is transmitted by the transmitting end device to the receiving end device and that is known to both the transmitting end device and the receiving end device. The transmitting device shown in the present application may be understood as a device that transmits a reference signal, and the receiving device may be understood as a device that receives the reference signal.

The channel estimation may be, for example, the channel estimation performed by the receiving end device based on a known reference signal (i.e., a reference signal that has been obtained in advance by both the transmitting end device and the receiving end device) and a received reference signal that has passed through the channel. For example, channel estimation is required when performing data demodulation or precoding calculation.

The channel measurement may be, for example, a measurement of the channel by the receiving end device based on a known reference signal (i.e., a reference signal that has been obtained in advance by both the transmitting end device and the receiving end device) and a received reference signal that has passed through the channel. For example, the reference signal received power (reference signal receiving power, RSRP), signal to interference plus noise ratio (signal to interference plus noise ratio, SINR) and the like of the channel may be measured.

Illustratively, the time synchronized receiver device determines the time instant at which the reference signal is received based on a known reference signal (i.e., a reference signal that has been obtained in advance by both the sender device and the receiver device) and the received reference signal that has passed through the channel. For example, the terminal device needs to measure the primary synchronization signal and the secondary synchronization signal in the SSB to perform downlink synchronization in the initial access process.

The reference signals shown in the present application may include demodulation reference signals (demodulation reference signal, DMRS), sounding reference signals (sounding reference signal, SRS), channel state information reference signals (channel state information-reference signals, CSI-RS), or the like. For convenience of description, various embodiments provided by the present application will be described below using DMRS as an example. However, the various embodiments provided by the present application are equally applicable to SRS or CSI-RS. For example, DMRS configuration information as shown below may be replaced with SRS configuration information or CSI-RS configuration information. As another example, step 604 shown below may also be replaced by the UE obtaining the first SRS sequence, and step 605 shown below may also be replaced by the UE performing uplink transmission according to the first SRS sequence, and so on. As another example, step 604 shown below may also be replaced by the UE obtaining the first CSI-RS sequence, and step 605 shown below may also be replaced by the UE performing downlink reception according to the first CSI-RS sequence, and so on.

4. Configuration information of reference signal sequence

Configuration information of the reference signal sequence may be used to configure information related to the reference signal sequence. The configuration information of the reference signal sequence is used for configuration: the allocation mode of the reference signal sequence, the time-frequency resource of the downlink physical channel used for carrying the reference signal sequence, the length of the reference signal sequence, the mapping sequence of the reference signal sequence on the downlink physical channel, the repetition number of the reference signal sequence on the downlink physical channel, the use configuration of the reference signal sequence and the use range of the reference signal sequence.

The allocation of reference signal sequences may be described in various embodiments as shown below and will not be described in detail here. It can be appreciated that the allocation of the reference signal sequence may be included in the above-mentioned reference signal configuration information, in which case the UE may explicitly learn the allocation of the reference signal sequence according to the indication of the base station. Alternatively, the allocation of the reference signal sequence may not be included in the reference signal configuration information, and in this case, the allocation of the reference signal sequence may be predefined. For example, the allocation of the reference signal sequence may be predefined by a protocol or a related standard. By way of example, any one of four different allocation manners of reference signal sequences shown below may be predefined, so that both the UE and the base station process the reference signal sequences according to the predefined allocation manner of the reference signal sequences.

The downlink physical channel used for carrying the reference signal sequence may be a physical downlink shared channel (physical download share channel, PDSCH), a physical downlink physical control channel (physical download control channel, PDCCH), or a downlink physical channel defined in other standards or protocols, which is not limited by the embodiment of the present application. For convenience of description, the method provided by the embodiment of the present application will be described below by taking a downlink physical channel for carrying a reference signal sequence as a PDSCH.

The time-frequency resources of the PDSCH (i.e., the downlink physical channel used to allocate the reference signal sequence described above) may be used to represent the time-frequency resources that carry the PDSCH when the base station transmits the PDSCH. E.g., the base station may transmit PDSCH over certain time-frequency resources.

The length of the reference signal sequence may be directly explicitly configured or may be determined according to the bandwidth of a physical channel (a channel involved in uplink transmission or downlink reception in step 605 shown below) using the reference signal sequence. For example, when the reference signal sequence occupies the bandwidth of the physical channel using the reference signal sequence, the length of the reference signal sequence may be the same as the bandwidth of the physical channel using the reference signal sequence (for example, the bandwidth of the physical channel may be in units of the number of subcarriers, the number of RBs, or the number of REs, and the specific value of the bandwidth of the physical channel is not limited by the present application). As another example, the reference signal sequence may also be 2-comb (comb), in which case the length of the reference signal sequence may be one-half of the bandwidth of the physical channel in which the reference signal sequence is used. In other words, the reference signal sequence maps one element every other subcarrier in the frequency domain, and the length of the reference signal sequence may be one half of the bandwidth of a physical channel using the reference signal sequence. As another example, the reference signal sequence may also be 3-comb, in which case the length of the reference signal sequence may be one third of the bandwidth of the physical channel in which the reference signal sequence is used. In other words, the reference signal sequence maps one element every two subcarriers in the frequency domain, and the length of the reference signal sequence may be one third of the bandwidth of a physical channel using the reference signal sequence. The embodiment of the application does not limit the relation between the length of the reference signal sequence and the bandwidth of the physical channel using the reference signal sequence.

The mapping order of the reference signal sequence on the PDSCH may be an order of first frequency domain and then time domain, or may be an order of first time domain and then frequency domain. Illustratively, the frequency-domain-first-time-domain mapping order shown here refers to: mapping element values of a reference signal sequence from a starting subcarrier to an ending subcarrier on a first time domain resource; and mapping the element values of the reference signal sequence from the starting subcarrier to the ending subcarrier on the second time domain resource. The first time domain resource and the second time domain resource refer to time domain resources in time-frequency resources of the PDSCH, and the number of the first time domain resource is smaller than the number of the second time domain resource. The start subcarrier refers to a start subcarrier of a frequency domain resource in the time-frequency resources of the PDSCH, and the end subcarrier refers to an end subcarrier of the frequency domain resource in the time-frequency resources of the PDSCH. Illustratively, the first time domain resource may be one orthogonal frequency division multiplexing (orthogonal frequency division multiplexing, OFDM) symbol, and the second time domain resource may also be one OFDM symbol, but the number of OFDM symbols of the first time domain resource is less than the number of OFDM symbols of the second time domain resource. The mapping order of the time-domain-first-frequency domain shown here refers to: mapping element values of a reference signal sequence from OFDM symbol to OFDM symbol from a starting OFDM symbol on a first frequency domain resource until the OFDM symbol is ended; and mapping the element values of the reference signal sequence from the beginning OFDM symbol to the OFDM symbol on the second frequency domain resource until the end OFDM symbol. The first frequency domain resource and the second frequency domain resource refer to frequency domain resources in time-frequency resources of the PDSCH, and the number of the first frequency domain resource is smaller than the number of the second frequency domain resource. The start OFDM symbol refers to a start OFDM symbol of a time domain resource among time-frequency resources of the PDSCH, and the end OFDM symbol refers to an end OFDM symbol of a time domain resource among time-frequency resources of the PDSCH. For example, the first frequency domain resource may be one subcarrier, and the second frequency domain resource may be one subcarrier, but the subcarrier number of the first frequency domain resource is smaller than the subcarrier number of the second frequency domain resource. It is to be understood that the mapping order shown above is exemplified by mapping the element values of the reference signal sequence to the PDSCH, but in the embodiment of the present application, a plurality of complex values determined according to the reference signal sequence may also be mapped to the PDSCH. Since the plurality of complex values are determined according to the plurality of element values of the reference signal sequence, a method of mapping the plurality of complex values to the PDSCH is not described in detail herein for brevity.

Optionally, the number of repetitions of the reference signal sequence on the PDSCH may be greater than one, so that the mapping order of the reference signal sequence on the PDSCH may also be that the reference signal sequence is mapped once and then mapped next repetition (i.e., all element values of the reference signal sequence are mapped first and then mapped repeatedly); alternatively, the multiple repetitions of each element value of the reference signal sequence may be mapped and mapped to the multiple repetitions of the next element value. For example, the reference signal sequence s= [ S1, S2, S3, … …, S36] and the number of repetitions of the reference signal sequence on the PDSCH is 2 (i.e. the PDSCH carries 2 repetitions of the reference signal sequence), the mapping order of the reference signal sequence on the PDSCH may be S1, S2, S3, … …, S36, S1, S2, S3, … …, S36; alternatively, the mapping order of the reference signal sequences on the PDSCH may be S1, S2, S3, … …, S36. S1 to S36 shown here can be understood as being in the form of complex values. It may be appreciated that the mapping order of the reference signal sequences on the PDSCH may be included in the reference signal configuration information. Alternatively, the mapping order of the reference signal sequence on the PDSCH may not be included in the reference signal configuration information, and in this case, the mapping order of the reference signal sequence on the PDSCH may be predefined by a protocol or a standard, or the like.

For example, the number of repetitions of the reference signal sequence on the PDSCH may be determined according to the length of the reference signal sequence and the size of the time-frequency resources of the PDSCH. For exampleWhere k is used to denote the number of repetitions, floor may be used to denote a rounding down,n may be used to represent the number of REs on the PDSCH that are available for mapping reference signal sequences, and L is used to represent the length of the reference signal sequences. It is understood that the reference signal configuration information may include the number of repetitions of the reference signal sequence. It is understood that the number of repetitions of the reference signal sequence may not be included in the reference signal configuration information, in which case the number of repetitions of the reference signal sequence may be predefined.

The usage configuration of the reference signal sequence includes one or more of a number of time domain symbols occupied by the reference signal sequence on a physical channel using the reference signal sequence, a configuration type of the reference signal sequence, and a reference signal port configuration. The configuration type of the reference signal sequence shown here may include type1 or type2, etc. It is understood that the reference signal configuration information may not include the use configuration of the reference signal sequence, and in this case, the use configuration of the reference signal sequence may be predefined by a protocol or a standard, or the like.

The usage range of the reference signal sequence includes a physical channel in which the reference signal sequence can be used and/or a valid time of the reference signal sequence. The physical channels that can use the reference signal sequence may include one or more of PUSCH, PUCCH, PDSCH or PDCCH, etc., as shown below in step 605 as channels involved in uplink or downlink reception. It is understood that the reference signal configuration information may include a usage range of the reference signal sequence. Alternatively, the reference signal configuration information does not include the usage range of the reference signal sequence, in which case the usage range of the reference signal sequence may be predefined, e.g., the usage range of the reference signal sequence may be specified by a protocol or standard, etc.

It can be understood that the configuration information of the reference signal sequence shown above mainly refers to configuration information used by the terminal device when the terminal device recovers the first reference signal sequence from the PDSCH. In other words, the terminal device may recover the first reference signal sequence through the configuration information of the reference signal sequence. I.e. the configuration information of the reference signal sequence can be understood as the relevant configuration information of the reference signal sequence carried in the downlink physical channel that needs to be allocated to the terminal device.

It will be appreciated that when the above information is predefined, the base station may not need to send reference signal configuration information to the UE.

It is understood that the above-mentioned reference signal configuration information may be carried in any one of downlink control information (downlink control information, DCI), radio resource control (radio resource control, RRC) signaling, medium access control (media access control, MAC) control element (MAC control element, MAC CE) signaling, or broadcast messages. Alternatively, the reference signal configuration information may be carried in other signaling or messaging, which is not limited by the present application.

It is to be appreciated that the element values of the reference signal sequences shown above may also be referred to simply as elements of the reference signal sequences.

It will be appreciated that the above description of the terms applies equally to the embodiments shown below, and that the descriptions of the terms are omitted below to avoid redundancy.

For example, the procedure of the UE obtaining the reference signal sequence S in advance may be as follows:

as shown in fig. 2a, the base station may send a reference signal sequence S to the UE so that the UE knows the reference signal sequence. Thereby ensuring that both the base station and the UE know the reference signal sequence transmitted by the UE. Meanwhile, after the UE transmits the uplink reference signal, the base station may estimate the uplink channel response according to the reference signal sequence transmitted by the UE. It can be appreciated that when the channel has uplink and downlink reciprocity, the base station may also estimate the downlink channel response based on the reference signal sequence sent by the UE.

Illustratively, in a New Radio (NR) system, the DMRS may employ a gold sequence or a ZC (Zadoff-Chu) sequence. The golden sequence and Zadoff-Chu sequence can be understood as structured sequences.

For example, a DMRS sequence based on a ZC sequence may be expressed as:

where, α=0, δ=1, n is used to represent the index of each element in the DMRS sequence,for indicating the number of subcarriers of PUSCH in which the DMRS is located,M _ZC for representing the length of the sequence, equal toN _ZC To satisfy N _ZC <M _ZC Maximum prime number, x _q For the original ZC sequence, f _gh and v represents the group number of the sequence group hopping and the sequence number of the sequence hopping, respectively, the base station determines its value by configuring whether to perform the sequence group hopping and the sequence hopping,reference signal ID configured for the base station.

From the above formula, it can be seen that the DMRS sequence based on ZC sequence can be combined with the number of subcarriers, f of the PUSCH where the DMRS sequence is located _gh 、v、 The parameters areAnd (3) closing. Therefore, the base station only needs to configure the parameters for the UE, the UE can generate the DMRS sequence according to the formula, the base station can generate the DMRS sequence in the same mode, and the DMRS sequences generated by the UE and the base station are the same. Thus, the base station and the UE can both obtain DMRS sequences, as shown in fig. 2 b.

Meanwhile, in the mctc or other scenarios where a large number of UEs exist, in order to improve the resource utilization rate, a plurality of UEs may be allocated on the same time-frequency resource, and the receiving end device may use the MIMO technology or advanced receiver to distinguish the signals of different UEs. When a plurality of UEs (transmitting end devices as shown above) transmit reference signals on the same block of time-frequency resources at the same time, a received signal Y received by a receiving end device may be represented as y= Σ _i S _i H _i And +n, reference signals among different UEs interfere with each other at this time, and the channel estimation performance is affected. In order to reduce interference between multi-user reference signals, the reference signals between UEs should be as orthogonal as possible, i.e. it should be ensured that the correlation between the reference signals of different UEs should be as low as possible.

However, the gold sequence and the ZC sequence can only support 12 orthogonal ports at maximum, and if the number of UEs on the same time-frequency resource exceeds 12, it is necessary to use a non-orthogonal sequence for spreading. Meanwhile, the correlation between the gold sequence and the ZC sequence spread by the non-orthogonal sequence is higher, and the channel estimation performance is poorer. However, some unstructured reference signal sequences may achieve better channel estimation performance. Unstructured reference signal sequences cannot be generated using a formula, and the reference signal sequences cannot be allocated to the UE by using the above-mentioned reference signal sequence allocation method. Thus, how the base station allocates the reference signal sequence to the UE needs to be solved.

In general, since unstructured reference signal sequences cannot be generated by a formula, unstructured reference signal sequences are generally stored in a base station and a UE after being predefined. Thereby, the predefined reference signal sequences are caused to be fixed, while the overhead of storing the reference signal sequences increases when the number and length of the predefined reference signal sequences are large.

In view of this, the present application provides a method and apparatus for determining a reference signal sequence, where in the technical solution provided in the present application, even if the reference signal sequence is an unstructured sequence, the UE may still obtain the reference signal sequence, so as to ensure that both the UE and the base station know the reference signal sequence. Furthermore, the reference signal sequence in the method provided by the application can be flexibly adjusted, and the storage overhead of the UE and the base station on the reference signal sequence is improved respectively.

Fig. 3 is a flowchart of a method for determining a reference signal sequence according to an embodiment of the present application, as shown in fig. 3, where the method includes:

301. the base station maps a plurality of complex values to time-frequency resources of the downlink physical channel, the plurality of complex values being determined from the reference signal sequence.

After the base station determines a plurality of complex values according to the reference signal sequence, the plurality of complex values can be mapped on the time-frequency resource of the downlink physical channel. The above-mentioned transmitting downlink physical channel can be understood as: and transmitting the downlink physical channel through the time-frequency resource. Since a plurality of complex values are mapped on the time-frequency resources of the downlink physical channel, transmitting the downlink physical channel through the time-frequency resources can also be understood as: transmitting the plurality of complex values over a time-frequency resource; alternatively, it can be understood that: the downlink physical channel carries a reference signal sequence; alternatively, it can be understood that: the downlink physical channel carries a plurality of complex values determined from the reference signal sequence. It is to be appreciated that the above-described time domain resources may be base station scheduled, semi-statically configured, etc., and embodiments of the present application are not limited in this regard. Correspondingly, the base station may indicate the time-frequency resource to the UE through configuration information or other information.

The complex values shown in the embodiment of the application are determined according to the reference signal sequence and comprise a plurality of complex values which are a plurality of element values of the reference signal sequence. Reference is made to the description of step 303 for a method for obtaining multiple complex values by the base station, which will not be described in detail here.

The complex values shown in the embodiments of the present application can be understood as follows:

the complex value is a number shaped as z=a+bi, where a and b are both real numbers, a is referred to as the real part, b is referred to as the imaginary part, and i is referred to as the imaginary unit. The imaginary part of z may be 0, in which case the complex value may also be referred to as a real number. Alternatively, the imaginary part of z may be other than 0 and the real part 0, in which case the complex value may also be referred to as the pure imaginary number. Alternatively, the real part of z is not 0 and the imaginary part is not 0. Therefore, the embodiment of the present application is not limited to the specific value of the complex value. Complex values may also be referred to as complex-valued symbols or complex-valued elements (complex value symbol), etc., and embodiments of the present application are not limited to the specific names of the complex values.

302. The base station transmits a downlink physical channel to the UE. Correspondingly, the UE receives the downlink physical channel.

Illustratively, the base station may transmit the downlink physical channel through a time-frequency resource.

303. The UE obtains a first reference signal sequence from a plurality of complex values received from a downlink physical channel.

In general, a signal received by a UE is a signal after a signal transmitted by a base station goes through a channel, and is different from a signal transmitted by a base station. Therefore, the multiple complex values received by the UE and the multiple complex values sent by the base station in the embodiments of the present application may be different. It may be understood that the downlink physical channel shown in the embodiment of the present application may include PDSCH or a physical channel control channel (physical downlink control channel, PDCCH), and the embodiment of the present application is not limited to the type of the downlink physical channel. For convenience of explanation, the method provided by the embodiment of the present application will be described below using the downlink physical channel as PDSCH.

A method for determining a plurality of complex values by the base station and a method for obtaining the first reference signal sequence by the UE in the embodiment of the present application will be described in detail.

It is understood that the first DMRS sequence shown below may be understood as a DMRS sequence that the UE derives from a plurality of complex values received from the PDSCH. The first DMRS sequence may also be understood as a DMRS sequence allocated to the UE by the base station, that is, the base station or the UE may use the first DMRS sequence to perform operations such as channel estimation, channel measurement, or time synchronization. In other words, the first DMRS sequence shown below represents a DMRS sequence that is not the PDSCH itself. As illustrated in fig. 4a, the first DMRS sequence represents a DMRS that is not PDSCH. Regarding the description of the first DMRS sequence, the first reference signal sequence shown in the embodiment of the present application is equally applicable.

One implementation way,

Complex values are the element values in the reference signal sequence. I.e. the plurality of complex values determined by the base station are a plurality of element values in the reference signal sequence. For example, the base station may map a plurality of element values in the reference signal sequence directly onto REs of the downlink physical channel. Correspondingly, the UE may recover a plurality of complex values carried by the downlink physical channel (i.e., a plurality of complex values sent by the base station) according to a plurality of complex values received on the downlink physical channel and a channel response of the downlink physical channel, and obtain the first reference signal sequence according to the recovered plurality of complex values.

For example, the base station may map a plurality of element values to REs of a downlink physical channel according to configuration information of the reference signal sequence. For example, the base station may determine the reference signal sequence based on the length of the reference signal sequence. For another example, the base station may map a plurality of element values on the time-frequency resource according to the time-frequency resource of the downlink physical channel configured by the configuration information. For another example, the base station may map the plurality of element values onto REs of the downlink physical channel according to a mapping order of the reference signal sequence. The mapping sequence shown in the embodiment of the application can comprise: and mapping the plurality of element values on the REs of the downlink physical channel according to the sequence of the time domain before the frequency domain, and/or mapping the plurality of repetitions of the plurality of element values on the REs of the downlink physical channel according to the mapping sequence.

For example, the DMRS sequence s= [ S1, S2, … S36], i.e. the DMRS sequence comprises 36 element values, i.e. the length of the DMRS sequence is 36 element values. Meanwhile, the repetition number of the DMRS sequence is 4, the mapping sequence of the DMRS sequence on the PDSCH is frequency domain first and then time domain second, and the mapping sequence of the DMRS sequence about the repetition number is that the reference signal sequence is mapped once and then mapped next repetition. And the time-frequency resource of the PDSCH is 1 Resource Block (RB) (e.g., including 12 subcarriers) and 1 slot (slot) (e.g., including 14 OFDM symbols). The mapping result of the DMRS sequence on the time-frequency resource of the PDSCH may be as shown in fig. 4 a. It can be understood that the constituent units of RBs, slots, REs, etc. shown in the embodiments of the present application are merely examples, and time domain resources or frequency domain resources for composing REs, RBs, etc. may change with the evolution of communication technology.

The horizontal axis in fig. 4a may be used to represent time domain resources and the vertical axis may be used to represent frequency domain resources. Meanwhile, the vertical axis indicates from low frequency to high frequency from bottom to top. One RE shown in the embodiment of the present application may be represented as one OFDM symbol on a time domain resource and one subcarrier on a frequency domain resource. As in fig. 4a, DMRS sequences that may be used to carry PDSCH on the first two OFDM symbols in the time-frequency resources of the PDSCH. The third to fourteenth OFDM symbols in the time-frequency resource of the PDSCH may be used to carry DMRS sequences. Since the mapping order of the DMRS sequence on the PDSCH is the first frequency domain time domain, the DMRS sequence may map the elements of the DMRS sequence from the start subcarrier to the end subcarrier on the third OFDM symbol (i.e., elements S1 to S12 may be mapped on the third OFDM symbol). And elements S13 to S24 may be mapped on the fourth OFDM symbol and elements S25 to 36 may be mapped on the fifth OFDM symbol. The DMRS sequence is then mapped repeatedly in sequence, thereby obtaining a mapping result as shown in fig. 4 a.

As still another example, the DMRS sequence s= [ S1, S2, … S36], the number of repetitions of the DMRS sequence is 4, the mapping order of the DMRS sequence on the PDSCH is first time domain and then frequency domain, and the mapping order of the DMRS sequence with respect to the number of repetitions is that the number of repetitions of each element value is mapped first and then the number of repetitions of the next element value is mapped. And the time-frequency resource of the PDSCH is 1 Resource Block (RB) (e.g., including 12 subcarriers) and 1 slot (slot) (e.g., including 14 OFDM symbols). The mapping result of the DMRS sequence on the time-frequency resource of the PDSCH may be as shown in fig. 4 b. It will be appreciated that with respect to the description of fig. 4b, reference may be made to the foregoing description and will not be described in detail herein.

Correspondingly, as illustrated in fig. 4a, the multiple complex values received by the UE from the PDSCH may be as illustrated in fig. 4 c. In this case, the UE may obtain the first reference signal sequence according to a plurality of complex values (e.g., Y1 to Y36 in fig. 4 c) received from the downlink physical channel and channel responses of the downlink physical channel. For example, the UE may estimate the channel response of the PDSCH through the DMRS sequence of the PDSCH (e.g., the DMRS of the PDSCH in fig. 4 a), estimate the sequence carried in the PDSCH (i.e., the multiple complex values carried in the PDSCH) according to the estimated channel response and the received PDSCH, and then determine the first reference signal sequence according to the estimated sequence carried in the PDSCH. For example, taking y=s×h+n as an example, the UE may obtain the channel response H of the PDSCH according to the DMRS sequence of the PDSCH, and then obtain the first reference signal sequence, i.e. S, according to the H and the received multiple complex values, i.e. Y.

Illustratively, the UE estimates the channel response of the PDSCH by Least Square (LS) or linear least mean square error (linear mean minimum square error, LMMSE). Alternatively, the UE may estimate the sequence (e.g. multiple complex values) carried in the PDSCH by using LS or LMMSE estimation method. Exemplary, the UE knows the DMRS sequence of PDSCH (e.g., DMRS of PDSCH in fig. 4 a): if the base station can configure the DMRS sequence of the PDSCH through DCI, and if the base station can configure the DMRS sequence of the PDSCH through MAC CE signaling, the method how the UE knows the DMRS sequence of the PDSCH is not limited in the embodiment of the present application. It should be noted that, in the method provided by the embodiment of the present application, when the reference signal is SRS or CSI-RS, the UE may still estimate the channel of the PDSCH through the DMRS sequence of the PDSCH, and then estimate the sequence mapped on the RE used for transmitting the SRS sequence or CSI-RS sequence in the PDSCH according to the estimated channel and the received PDSCH.

For example, the UE may also recover the first DMRS sequence according to the configuration information of the DMRS sequence and the plurality of complex values carried in the PDSCH. For example, the UE may obtain the first DMRS sequence according to the configuration information such as the mapping order of the DMRS sequence, the number of repetitions, and the estimated multiple complex values. As illustrated in fig. 4c, the complex values estimated by the UE from the PDSCH are y= [ Y1, Y2, … Y144 in order of the first frequency domain in the time domain]ThenThe first DMRS sequence recovered by the UE may be

It is to be appreciated that, for one implementation, the allocation of the reference signal sequence may be used to indicate that the element values in the reference signal sequence are mapped directly on Resource Elements (REs) of the downlink physical channel.

In the embodiment of the present application, the base station configures the configuration information of the DMRS sequence for the UE, so that the UE can recover the DMRS sequence (such as the first DMRS sequence) carried on the downlink physical channel according to the configuration information of the DMRS sequence. Alternatively, the configuration information of the DMRS sequence may be predefined, in which case the UE may recover the DMRS sequence carried on the downlink physical channel according to the configuration information of the predefined DMRS sequence. Therefore, the base station can transmit any complex sequence on the downlink physical channel, and not only can support the distribution mode of the structured reference signal sequence, but also can support the distribution mode of the unstructured reference signal sequence.

Meanwhile, the method provided by the embodiment of the application improves the situation that a large number of DMRS sequences are predefined by related standards or protocols and are stored in the UE and the base station, thereby improving the situation that the UE and the base station need to occupy larger storage overhead to store a large number of DMRS sequences.

The second implementation mode,

The complex value is determined from the element values in the reference signal sequence and the first channel response. I.e. the base station may obtain a plurality of complex values after processing the plurality of element values in the reference signal sequence according to the first channel response. The first channel response is a channel response of the downlink physical channel to be subjected to channel estimated by the base station. Correspondingly, the UE may use the plurality of complex values received from the downlink physical channel as element values in the first reference signal sequence.

For example, the base station may map a plurality of complex values to REs of the downlink physical channel according to configuration information of the reference signal sequence. It will be appreciated that the description of configuration information shown herein may refer to the description in the first implementation described above, and will not be described in detail here.

In the embodiment of the application, the base station can perform preprocessing on each element value in the reference signal sequence according to the estimated channel response to obtain a plurality of complex values. The purpose of the preprocessing is that after the UE receives the PDSCH, the UE can directly demap a plurality of complex values received from the PDSCH according to the DMRS configuration information without performing steps such as channel estimation and demodulation on the PDSCH, and the demapped result is used as the first DMRS sequence. That is, after the DMRS sequence is preprocessed by the base station, the UE does not need to estimate the PDSCH channel through the DMRS sequence of the PDSCH, but can directly recover a plurality of complex values received on the PDSCH into the first DMRS sequence according to the DMRS configuration information.

For example, for a base station, the base station may first perform preprocessing on element values in the DMRS sequence to obtain multiple complex values. And then the complex values are mapped on REs of the downlink physical channels according to a specific sequence. Exemplary, DMRS sequences s= [ S1, S2, … …, S36]Channel response h= [ H1, H2, … …, H36, possibly experienced by the DMRS sequence]The pretreated sequence x= [ X1, X2, … …, X36]. Wherein X1 is obtained after S1 pretreatment, X2 is obtained after S2 pretreatment, and so on, and X36 is obtained after S36 pretreatment. X1 to X36 shown here can be understood as a plurality of complex values determined by the base station from the reference signal sequence. The channel response that the DMRS sequence may experience is base station-to-UE channel information that the base station obtains in advance. The preprocessed sequence X is a sequence sent by the base station to the UE, and after the sequence X passes through the channel, the sequence Y that the UE wants to receive may be the same as the S as much as possible. In other words, the purpose of the preprocessing is to make the plurality of complex values y= [ Y1, Y2, … Y36 received by the UE after the plurality of complex values after the preprocessing pass through the channel]As much as possible, the same element values as in the DMRS sequence S described above. I.e. s=y=diag (H) x+n, Where n is noise. For example, the base station may pre-process the DMRS sequence according to a minimum mean square error (mean minimum square error, MMSE) criterion. A pretreatment method is that of X=RH ^H (HRH ^H +σ ² I) ^-1 S, wherein R is covariance matrix of channel H, H ^H Represents the conjugate transpose, sigma, of channel H ² Is the variance of the noise, I is the identity matrix, X is the pre-processed sequence, i.e. a plurality of complex values obtained from the reference signal sequence.

In the embodiment of the present application, since the UE does not need to perform channel estimation, the PDSCH may not include the DMRS of the PDSCH. Alternatively, DMRS sequences for phase estimation and amplitude calibration may be included in the PDSCH. It may be understood that, for whether the DMRS of the PDSCH is included in the PDSCH, the number of REs used for carrying the DMRS, or the REs used for carrying the DMRS may be predefined, or may be configured by a base station, etc., which is not limited by the embodiment of the present application. For example, whether the DMRS of the PDSCH is included in the PDSCH, the number of REs for carrying the DMRS, and the like may be included in the DMRS configuration information described above.

Illustratively, the pre-processed sequence x= [ X1, X2, …, X36], i.e., DMRS sequence length is 36. Meanwhile, the repetition number of the DMRS sequence is 4, the mapping sequence of the DMRS sequence on the PDSCH is frequency domain first and then time domain, and the time-frequency resource of the PDSCH is 1RB and 12 OFDM symbols. The mapping result of the preprocessed sequence on the PDSCH may be as shown in fig. 5 a. As shown in fig. 5a, with respect to fig. 4a, the first two OFDM symbols in the time-frequency resource of the PDSCH do not need to carry the DMRS sequence of the PDSCH. Thus, the first OFDM symbol to the twelfth OFDM symbol in the time-frequency resource of the PDSCH may be used to carry the preprocessed sequence X. It will be appreciated that for brevity, the detailed description with respect to FIG. 5a may be analogized to FIG. 4a and will not be described in detail herein.

After the preprocessed sequence X undergoes a channel, the UE may obtain multiple complex values from PDSCH as shown in fig. 5 b. In this case, the UE may directly demap the received sequence according to the DMRS configuration information, and use the demapped sequence as the reference signal sequence. In particular, e.gThe UE may convert the received plurality of complex values into the DMRS sequence according to configuration information such as a mapping order of the DMRS sequence, the number of repetitions, and the like. As illustrated in fig. 5b, the UE receives the sequence y= [ Y1, Y2, … Y144 in order of frequency domain first and time domain second]The first DMRS sequence recovered by the UE may be

It will be appreciated that for implementation two, the allocation of the reference signal sequence may be used to indicate that the terminal device may directly use the received plurality of complex values as element values in the first reference signal sequence. I.e. the allocation of the reference signal sequences may be used to indicate that the terminal device does not need to obtain the first reference signal sequence from the channel response of the downlink physical channel. Alternatively, the allocation of the reference signal sequence may be used to indicate that the complex values are mapped to REs of the downlink physical channel after being preprocessed.

In the embodiment of the application, the base station performs preprocessing on the reference signal sequence to be allocated, and then maps the preprocessed sequence on the RE of the downlink physical channel according to a specific sequence, so that not only can any complex sequence be transmitted, but also the UE can directly take the received sequence as the reference signal sequence without complex operation after receiving the sequence. Meanwhile, the situation that the UE and the base station need to occupy larger storage overhead to store a large number of DMRS sequences is improved.

The third implementation mode,

The complex value is a preset value obtained by quantizing element values in the reference signal sequence. That is, the base station may quantize one element value in the reference signal sequence to a preset value, and then use the preset value corresponding to a plurality of element values in the reference signal sequence as a plurality of complex values. Correspondingly, the UE may obtain a plurality of complex values carried by the downlink physical channel according to the plurality of complex values received on the downlink physical channel and the channel response of the downlink physical channel, then determine one complex value carried by the downlink physical channel as a preset value, and then determine the first reference signal sequence according to the preset value corresponding to the plurality of complex values carried by the downlink physical channel.

Generally, the range of values of the element values of the DMRS sequence determined by the base station is relatively large, and in some cases, the range of values may be continuous. For example, the real part and the imaginary part of each element value of the DMRS sequence may have a value ranging from [ -2,2], that is, any number that is greater than or equal to-2 and less than or equal to 2. When a certain element value of the DMRS sequence transmitted by the base station is 0.7+0.2i, the element value estimated by the UE may become 0.66+0.25i due to the influence of the channel and noise after the element value passes through the channel. In this case, since the estimated value is still within the range of the DMRS sequence, the UE cannot determine what the actual value of the DMRS sequence (i.e., the DMRS sequence transmitted from the base station) is, and only the estimated DMRS sequence can be used. Thereby, deviations may occur in DMRS sequences used by the UE and the base station.

Based on the above situation, the embodiment of the application provides a method for quantifying the DMRS sequence to change the value range into a limited number of discrete values, thereby improving the situation that the DMRS sequences used by the UE and the base station have deviation. E.g. 4 constellation points with quadrature phase shift keying (quadrature phase shift keying, QPSK) For example, when a certain element value in the DMRS sequence transmitted by the base station isThe element value received by the UE may be due to channel and noise effectsAt this time, the UE may judge that The UE can recover the DMRS sequence actually transmitted by the base station through some judging methods, so that the reliability of the transmission of the DMRS sequence is effectively improved. Illustratively, the base station may quantize each element value of the DMRS sequence into the four discrete values described above by a proximity principle. For example, a certain element in the DMRS sequence has a value ofDue to the fact thatAnd (3) withThe difference between them is smaller thanAnd (3) withAnd the like, and thus, the element valueCan be quantized intoIllustratively, the UE may also recover the DMRS sequence by the proximity principle. It can be understood that the above 4 constellation points are only examples, and the preset values shown in the embodiment of the present application may also be included Other values are included as long as the preset value is a value known to both the base station and the UE.

For example, the DMRS sequence s= [ S1, S2, … S36], the base station may quantize the S1 to S36 to obtain 36 discrete values, respectively. Taking the above shown 4 constellation points as an example, the base station may quantize one element value of the DMRS sequence into one value of the 4 constellation points according to a proximity principle, and according to the method, the base station may quantize 36 element values in the DMRS sequence respectively, so as to obtain 36 complex values, where the 36 complex values are all values in the 4 constellation points. The base station may then map the 36 complex values obtained onto REs of PDSCH. Reference may be made to fig. 4a for the mapping result of the 36 complex values, which will not be described in detail here.

Correspondingly, even if the 36 complex values (the 36 complex values are all included in the preset values) transmitted by the base station undergo channel response, the 36 complex values received by the UE are different from the 36 complex values transmitted by the base station. However, the UE may still determine the 36 complex values as preset values according to the determination method and the channel response of the PDSCH, so as to ensure that the reference signal sequences on the base station side and the UE side are consistent. For example, the UE may first determine a plurality of complex values carried in the PDSCH according to a channel response of the PDSCH and a plurality of complex values received from the PDSCH. And then, according to a judging method, judging each complex value carried in the PDSCH as a preset value. Therefore, the UE may determine the first reference signal sequence according to preset values corresponding to the plurality of complex values carried by the PDSCH. As to whether the UE makes a decision first or demaps a plurality of complex values carried in the PDSCH according to the configuration information of the DMRS sequence, the embodiment of the present application is not limited.

In the embodiment of the present application, reference may be made to the first implementation manner, and details are not repeated here for the configuration information of the DMRS sequence, the method for mapping the DMRS sequence on the REs of the PDSCH, and the method for determining the DMRS sequence by the UE.

For implementation three, the allocation of the reference signal sequence may be used to indicate that the terminal device needs to decide each complex value as a preset value. Alternatively, the allocation of the reference signal sequence may be used to indicate that the complex values are quantized and mapped to REs of the downlink physical channel.

By the allocation method of the DMRS sequences, the reliability of transmission of the DMRS sequences on the air interface can be improved, so that the DMRS sequences recovered by the UE are the same as possible as the DMRS sequences expected to be transmitted by the base station.

The realization mode is four,

The complex value is determined from the quantized values of the elements in the reference signal sequence and the first channel response. That is, the base station may quantize one element value in the reference signal sequence to a preset value, and then pre-process preset values corresponding to a plurality of element values in the reference signal sequence according to the first channel response to obtain a plurality of complex values. The first channel response is a channel response of the downlink physical channel to be subjected to channel estimated by the base station. Correspondingly, the UE may determine a plurality of complex values carried in the downlink physical channel as preset values, and use preset values corresponding to the plurality of complex values carried in the downlink physical channel as element values in the first reference signal sequence.

In the embodiment of the application, the base station can quantize the element values in the DMRS sequence to obtain a plurality of preset values, and then preprocess each preset value in the plurality of preset values according to the estimated channel response to obtain a plurality of complex values. The purpose of the preprocessing is that after the UE receives the PDSCH, the UE can directly demap a plurality of complex values received from the PDSCH according to the configuration information of the DMRS sequence without performing steps such as channel estimation, demodulation and the like on the PDSCH, then judge the demapping result as a plurality of preset values, and the plurality of preset values are used as the first DMRS sequence. That is, after the DMRS sequence is preprocessed by the base station, the UE does not need to estimate the PDSCH channel through the DMRS sequence of the PDSCH, but can directly recover a plurality of complex values borne by the PDSCH into the first DMRS sequence according to the DMRS configuration information.

Exemplary, DMRS sequences s= [ S1, S2, … S36]The base station can quantize the S1 to S36 to obtain 36 preset values, which are d= [ D1, D2, … D36]. Taking the above-shown 4 constellation points as an example, the base stationAccording to the method, the base station can respectively quantize 36 element values in the DMRS sequence so as to obtain 36 discrete complex values, wherein the 36 discrete complex values are preset values in the 4 constellation points. The base station then pre-processes the 36 preset values according to the estimated channel response to obtain a plurality of complex values. Exemplary, the DMRS sequence may experience a channel response h= [ H1, H2, … …, H36 ]The pretreated sequence x= [ X1, X2, … …, X36]Wherein X1 is obtained after pretreatment of D1, X2 is obtained after pretreatment of D2, and so on, and X36 is obtained after pretreatment of D36. X1 to X36 shown here can be understood as a plurality of complex values determined by the base station from the reference signal sequence. The channel response that the DMRS sequence may experience is base station-to-UE channel information that the base station obtains in advance. The preprocessed sequence X (i.e., a plurality of complex values determined by the base station) is a sequence sent by the base station to the UE, and after the sequence X passes through the channel, the sequence Y that the UE wants to receive may be the same as the above D as much as possible. In other words, the purpose of the preprocessing is to make the sequence y= [ Y1, Y2, … Y36 received by the UE after the preprocessed sequence is expected to pass through the channel]As much as possible identical to the quantized DMRS sequence D described above. I.e. d=y=diag (H) x+n, where n is noise. For example, the base station may pre-process the DMRS sequence according to a minimum mean square error (mean minimum square error, MMSE) criterion. A pretreatment method is that of X=RH ^H (HRH ^H +σ ² I) ^-1 D, where R is the covariance matrix of the channel H, H ^H Represents the conjugate transpose, sigma, of channel H ² Is the variance of the noise, I is the identity matrix, and X is the preprocessed sequence.

The base station may then map the 36 complex values obtained onto REs of PDSCH. Reference may be made to fig. 5a for the mapping result of the 36 complex values, which will not be described in detail here.

Correspondingly, even if the 36 complex values (the 36 complex values are all included in the preset values) sent by the base station undergo channel response, the 36 complex values received by the UE are different from the quantized 36 preset values. However, the UE may still determine the 36 complex values received by the UE as preset values according to the determining method, so as to ensure that the reference signal sequences on the base station side and the UE side are consistent. For example, the UE may further determine the first reference signal sequence according to a decision method (e.g., a neighbor rule) and configuration information of the DMRS sequence. In the embodiment of the present application, the configuration information of the DMRS sequence, the method for mapping the DMRS sequence on the REs of the PDSCH, and the method for determining the DMRS sequence by the UE may refer to the second implementation manner or the third implementation manner, and will not be described herein.

For implementation four, the allocation of the reference signal sequence may be used to indicate that the terminal device needs to decide each complex value as a preset value. Alternatively, the allocation of the reference signal sequence may be used to indicate that the complex values are quantized and then mapped to REs of the downlink physical channel according to the first channel response preprocessing.

The realization mode is five,

The complex value is obtained by encoding and modulating the element values in the reference signal sequence. That is, the base station may obtain a plurality of complex values after subjecting a plurality of element values in the reference signal sequence to encoding processing and modulation processing. Correspondingly, the UE may perform demodulation processing and decoding processing (may also be referred to as decoding processing) on a plurality of complex values received on the downlink physical channel, obtain a decoding result, and then determine the first reference signal sequence according to the decoding result.

In the embodiment of the application, the base station can quantize and map the DMRS sequence into bit stream, encode, modulate and the like to obtain a plurality of complex values. The plurality of complex values are then mapped onto REs of PDSCH. Correspondingly, the UE may estimate the channel of the PDSCH through the DMRS sequence of the PDSCH to obtain the channel response of the PDSCH. And estimating a plurality of complex values carried by the PDSCH according to the estimated channel response and the received PDSCH, and then carrying out demodulation processing, decoding processing and the like on the plurality of complex values carried by the PDSCH to obtain a decoding result. And then obtaining a first DMRS sequence according to the decoding result. For example, the UE may further demap the decoding result according to the DMRS configuration information, so as to recover the DMRS sequence allocated by the base station. Illustratively, the base station may encode by a low density parity check code (low density Parity check code, LDPC) method or a polar code encoding method, etc., which are not limited by the embodiments of the present application. Illustratively, the base station may modulate by quadrature phase shift keying (quadrature phase shift keying, QPSK) or quadrature amplitude modulation (quadrature amplitude modulation, QAM) methods, etc., which are not limited by the embodiments of the present application.

The reliability of DMRS sequence transmission can be improved by encoding the DMRS sequence. For example, due to the influence of a channel and noise, an error may occur when the UE demodulates the DMRS sequence, so that the UE can determine whether the DMRS sequence is received correctly through the coding process, or the UE may correct the demodulation error, thereby recovering the correct DMRS sequence.

For the fifth implementation manner, the allocation manner of the reference signal sequence may be used to indicate that the terminal device needs to obtain the first reference signal sequence according to the decoding result after undergoing demodulation processing and decoding processing. Or, the allocation mode of the reference signal sequence is used to indicate that the reference signal sequence is sent according to the transmission mode of the data or the control information. Alternatively, the reference signal sequence is allocated in a manner to indicate that a plurality of complex values are obtained after the encoding process and the modulation process.

In the embodiment of the application, not only the distribution of unstructured DMRS sequences can be supported, but also the reliability of the transmission of the DMRS sequences can be improved by carrying out coding and other processes on the DMRS sequences.

The method for determining a plurality of complex values by the base station and the method for determining the first reference signal sequence by the UE according to the plurality of complex values in the embodiments of the present application are described in detail above. In the implementations shown above, where one of them is not described in detail, reference may also be made to another implementation, or to descriptions of other embodiments of the application, etc.

In the technical scheme provided by the embodiment of the application, even if the reference signal sequence is an unstructured reference signal sequence, the terminal equipment can still obtain the first reference signal sequence through the complex values, so that the problem that the terminal equipment cannot effectively obtain the unstructured reference signal sequence is solved.

In combination with the method shown in fig. 3 and the five implementation manners shown above, the embodiment of the present application further provides a flowchart of a method for determining a reference signal sequence. As shown in fig. 6, the method includes:

601. and the base station transmits the configuration information of the DMRS sequence to the UE, and correspondingly, the UE receives the configuration information of the DMRS sequence from the base station.

The embodiment of the present application is illustrated by taking the allocation manner of the DMRS sequence included in the configuration information of the DMRS sequence as an example, and the allocation manner of the DMRS sequence is a predefined manner, which is not described in detail in the embodiment of the present application. Reference may be made to the above description for configuration information of DMRS sequences, which is not described in detail here.

602. The base station determines a plurality of complex values according to the DMRS sequence, and maps the complex values on REs of the PDSCH.

The method for determining a plurality of complex values for a base station may refer to the five implementations shown above and will not be described in detail here.

603. The base station transmits PDSCH to the UE. Correspondingly, the UE receives the PDSCH.

In the embodiment of the present application, the PDSCH may be carried in: and the time-frequency resources configured in the configuration information of the DMRS sequence (i.e., the time-frequency resources used for PDSCH carrying the DMRS sequence). Meanwhile, the UE may receive the PDSCH on the time-frequency resource. It will be appreciated that, while the configuration information includes time domain resources as an example, the time-frequency resources may be semi-statically configured, or may be sent to the UE through other information, which is not limited by the embodiment of the present application.

For the above steps 601 and 602, for example, the configuration information of the DMRS sequence is carried in DCI, which may be used to schedule PDSCH. Thus, after receiving the DCI, the UE can obtain the DMRS sequence allocation scheme or the like through the DCI. For another example, the UE may acquire the PDSCH from the time-frequency resource by determining the time-frequency resource of the PDSCH through the DCI. For another example, the UE may also obtain the mapping order of DMRS sequences or the like through the DCI.

604. The UE obtains a first DMRS sequence from a plurality of complex values received from the PDSCH.

It is understood that the method for the UE to obtain the first DMRS sequence may refer to the five implementations shown above, and will not be described in detail herein.

605. And the UE performs uplink transmission or downlink reception according to the first DMRS sequence.

For example, after the UE obtains the first DMRS sequence, uplink transmission or downlink reception may be performed in an effective period of the first DMRS sequence and on a physical channel to which the first DMRS sequence can be applied. For example, the effective time of the first DMRS sequence is a preset duration after the UE receives the PDSCH, if the UE receives the PDSCH for a time T and the preset duration is D, the effective time of the first DMRS sequence may be determined according to the T and D. For another example, the effective time of the first DMRS sequence may be from the time T1 when the UE receives the PDSCH to the time T2, where the time T1 may be determined by the preset duration. The duration between the time T1 and the time T2 may be included in the configuration information of the DMRS sequence, or may be a predefined value, which is not limited in the embodiment of the present application. If the physical channel to which the DMRS sequence is applied is PUSCH or PDSCH, the UE may transmit PUSCH or receive PDSCH using the first DMRS sequence during the period from time T1 to time T2.

For example, after the UE receives the first DMRS sequence, channel estimation, channel measurement, time synchronization, or the like may be performed on the first DMRS sequence. As another example, the UE may also send the first DMRS sequence to the base station, so that the base station performs operations such as channel estimation, channel measurement, or time synchronization according to a plurality of complex values (e.g., determined according to the first DMRS sequence) received by the base station.

It is understood that the configuration information of the reference signal sequence shown above may be referred to for the use configuration of the first DMRS sequence and/or the use range of the first DMRS sequence, etc., and will not be described in detail herein.

The technical scheme provided by the embodiment of the application aims at the problems that in the current New Radio (NR) protocol, when a base station distributes a reference signal sequence to UE, only a structured reference signal sequence can be distributed, or a reference signal sequence predefined by the protocol can not be distributed, and an unstructured reference signal sequence not predefined by the protocol can not be distributed. By the method provided by the embodiment of the application, the base station can allocate the unstructured reference signal sequences with the undefined protocol to the UE, so that the limitation of the reference signal sequences is expanded, the problem that a large number of sequences need to be predefined in the protocol is solved, and the problem that a large number of sequences need to be stored in the UE and the base station is solved. Therefore, the problem of high expenditure of the UE and the base station for storing the reference signal sequence is solved, and the storage expenditure of the UE and the base station is effectively reduced.

It can be understood that the method provided by the embodiment of the application can be applied not only to the scene of transmitting the reference signal sequence between the UE and the base station, but also to the scene of transmitting the complex sequence from one communication device to another communication device, for example, the complex sequence is not limited to the reference signal sequence.

It will be appreciated that in the various embodiments shown above, where one embodiment is not described in detail, reference may also be made to other embodiments, etc.

The following describes a communication device provided by an embodiment of the present application.

According to the method embodiment of the application, the communication device is divided into the functional modules, for example, each functional module can be divided corresponding to each function, and two or more functions can be integrated into one processing module. The integrated modules may be implemented in hardware or in software functional modules. It should be noted that, the division of the modules in the present application is illustrative, and is merely a logic function division, and other division manners may be implemented in practice. The communication device according to the embodiment of the present application will be described in detail with reference to fig. 7 to 9.

Fig. 7 is a schematic structural diagram of a communication device according to an embodiment of the present application, and as shown in fig. 7, the communication device includes a processing unit 701 and a transceiver unit 702. The communication means may be the terminal device shown above or a chip in the terminal device or the like. I.e. the communication means may be adapted to perform the steps or functions etc. performed by the terminal device, including the UE, in the above method embodiments.

Illustratively, the transceiver unit 702 is configured to input a downlink physical channel; a processing unit 701, configured to obtain a first reference signal sequence according to a plurality of complex values received from the downlink physical channel.

Illustratively, the transceiver unit 702 is further configured to input configuration information of the reference signal sequence.

The processing unit 701 is specifically configured to obtain the first reference signal sequence according to a plurality of complex values and configuration information received from the downlink physical channel.

The processing unit 701 is specifically configured to determine a channel response of the downlink physical channel according to a reference signal of the downlink physical channel; and obtaining a first reference signal sequence according to the plurality of complex values received from the downlink physical channel and the channel response of the downlink physical channel.

The processing unit 701 is specifically configured to perform demodulation processing and decoding processing on a plurality of complex values received from a downlink physical channel, so as to obtain a decoding result; and determining a first reference signal sequence according to the decoding result.

The processing unit 701 is specifically configured to obtain a plurality of complex values carried by a physical channel of the downlink physical channel according to the plurality of complex values received from the physical channel, and determine one complex value carried by the physical channel of the downlink as a preset value; and determining a first reference signal sequence according to preset values corresponding to the complex values carried by the downlink physical channel.

The processing unit 701 is specifically configured to determine one complex value received from the downlink physical channel as a preset value, and determine the first reference signal sequence according to the preset values corresponding to the complex values received from the downlink physical channel.

Illustratively, the transceiver unit 702 is further configured to output an uplink signal according to the first reference signal sequence; or, the method is also used for inputting the downlink signal according to the first reference signal sequence.

The transceiver unit 702 may perform the step of outputting the uplink signal or receiving the downlink signal through the processing unit 701. Such as transceiver 702, after receiving the downlink signal, processing 701 may process the downlink signal. For another example, after the uplink signal is processed by the processing unit 701, the transceiver unit 702 outputs the uplink signal processed by the processing unit 701. The specific steps of the transceiver unit 702 for outputting the uplink signal or inputting the downlink signal are not limited in the embodiment of the present application.

It will be appreciated that the specific description of the transceiver unit and the processing unit shown above may also refer to steps performed by the terminal device or UE in the above-described method embodiments. Illustratively, the transceiver unit 702 may be configured to perform the receiving step of step 302 shown in fig. 3, and the processing unit 701 may be configured to perform step 303 shown in fig. 3. Illustratively, the transceiver unit 702 may be further configured to perform the receiving step in step 601 and the receiving step in step 603 shown in fig. 6, the processing unit 701 may be further configured to perform step 604 shown in fig. 6, and the transceiver unit 702 may be further configured to perform step 605 shown in fig. 6.

Multiplexing fig. 7, the embodiment of the present application further provides a communication device, as shown in fig. 7, where the communication device includes a processing unit 701 and a transceiver unit 702. The communication means may be an access network device or a chip in an access network device or the like as shown above. I.e. the communication means may be adapted to perform the steps or functions etc. performed by the access network device, including the base station, in the above method embodiments.

The processing unit 701 is configured to map a plurality of complex values to time-frequency resources of a downlink physical channel, where the plurality of complex values are determined according to a reference signal sequence; and a transceiver unit 702, configured to output the downlink physical channel.

The transceiver unit 702 is further configured to output configuration information of the reference signal sequence.

The processing unit 701 is specifically configured to perform coding processing and modulation processing on each element value in the reference signal sequence, so as to obtain a plurality of complex values; and mapping the plurality of complex values to time-frequency resources of the downlink physical channel.

The processing unit 701 is specifically configured to process each element value in the reference signal sequence according to a first channel response, to obtain a plurality of complex values, where the first channel response is a channel response to be experienced by a downlink physical channel; and mapping the plurality of complex values to time-frequency resources of the downlink physical channel.

The processing unit 701 is specifically configured to quantize an element value in the reference signal sequence to a preset value; obtaining a plurality of complex values according to preset values corresponding to a plurality of element values in the reference signal sequence; and mapping the plurality of complex values to time-frequency resources of the downlink physical channel.

The processing unit 701 is specifically configured to quantize an element value in the reference signal sequence to a preset value; obtaining a plurality of complex values according to preset values corresponding to a plurality of element values in the reference signal sequence and the first channel response; the plurality of complex values are then mapped to time-frequency resources of a downlink physical channel.

It can be understood that, in the embodiment of the present application, the time-frequency resource mapping a plurality of complex values to a downlink physical channel includes: a plurality of complex values are mapped on REs of the downlink physical channel.

It will be appreciated that the specific description of the transceiver unit and the processing unit shown above may also refer to steps performed by the access network device or the base station in the above-described method embodiments.

Illustratively, the processing unit 701 may be configured to perform step 301 shown in fig. 3, and the transceiver unit 702 may be configured to perform the transmitting step in step 302 shown in fig. 3. Illustratively, the transceiver unit 702 may be further configured to perform the transmitting step in step 601 shown in fig. 6, the processing unit 701 may be further configured to perform step 602 shown in fig. 6, and the transceiver unit 702 may be further configured to perform the transmitting step in step 603 shown in fig. 6.

In the embodiments shown above, reference may be made to the description in the above method embodiments, and details are not given here.

The access network device and the terminal device according to the embodiments of the present application are described above, and possible product forms of the access network device and the terminal device are described below. It should be understood that any product having the function of the access network device described in fig. 7, or any product having the function of the terminal device described in fig. 7, falls within the scope of the embodiments of the present application. It should also be understood that the following description is only exemplary, and is not intended to limit the product forms of the access network device and the terminal device according to the embodiments of the present application.

In a possible implementation, in the communications apparatus shown in fig. 7, the processing unit 701 may be one or more processors, the transceiver unit 702 may be a transceiver, or the transceiver unit 702 may also be a transmitting unit and a receiving unit, where the transmitting unit may be a transmitter and the receiving unit may be a receiver, and the transmitting unit and the receiving unit are integrated into one device, for example, a transceiver. In the embodiment of the present application, the processor and the transceiver may be coupled, etc., and the embodiment of the present application is not limited to the connection manner of the processor and the transceiver.

As shown in fig. 8, the communication device 80 includes one or more processors 820 and a transceiver 810.

In some embodiments of the present application, when the communication apparatus 80 is a terminal device (including UE), the method, function, or operation performed by the processor 820 may refer to the method, function, or operation performed by the processing unit 701 (i.e., the communication apparatus shown in fig. 7 is a terminal device), the method, function, or operation performed by the transceiver 810 may refer to the method, function, or operation performed by the transceiver unit 702.

In other embodiments of the present application, when the communication apparatus 80 is an access network device (including a base station), the method, the function, the operation, etc. performed by the processor 820 may refer to the method, the function, the operation, etc. performed by the processing unit 701 (i.e., the communication apparatus shown in fig. 7 is an access network device), and the method, the function, the operation, etc. performed by the transceiver 810 may refer to the method, the function, the operation, etc. performed by the transceiver unit 702.

It will be appreciated that the specific description of the processor and transceiver may also refer to the description of the processing unit and transceiver unit shown in fig. 7, and will not be repeated here.

In various embodiments of the communication device shown in fig. 8, the transceiver may include a receiver for performing the functions (or operations) of receiving and a transmitter for performing the functions (or operations) of transmitting. And transceivers are used to communicate with other devices/means via transmission media.

Optionally, the communication device 80 may also include one or more memories 830 for storing program instructions and/or data. Memory 830 is coupled to processor 820. The coupling in the embodiments of the present application is an indirect coupling or communication connection between devices, units, or modules, which may be in electrical, mechanical, or other forms for information interaction between the devices, units, or modules. Processor 820 may operate in conjunction with memory 830. Processor 820 may execute program instructions stored in memory 830. In the alternative, at least one of the one or more memories may be included in the processor.

The specific connection medium between the transceiver 810, the processor 820, and the memory 830 is not limited in the embodiment of the present application. In the embodiment of the present application, the memory 830, the processor 820 and the transceiver 810 are connected through the bus 840 in fig. 8, the bus is shown by a thick line in fig. 8, and the connection manner between other components is only schematically illustrated, but not limited thereto. The buses may be classified as address buses, data buses, control buses, etc. For ease of illustration, only one thick line is shown in fig. 8, but not only one bus or one type of bus.

In the embodiment of the present application, the processor may be a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, or the like, and may implement or execute the methods, steps, and logic blocks disclosed in the embodiment of the present application. The general purpose processor may be a microprocessor or any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present application may be embodied directly in a hardware processor for execution, or in a combination of hardware and software modules in the processor for execution, etc.

In an embodiment of the present application, the Memory may include, but is not limited to, nonvolatile Memory such as Hard Disk Drive (HDD) or Solid State Drive (SSD), random access Memory (Random Access Memory, RAM), erasable programmable Read-Only Memory (Erasable Programmable ROM, EPROM), read-Only Memory (ROM), portable Read-Only Memory (Compact Disc Read-Only Memory, CD-ROM), etc. The memory is any storage medium that can be used to carry or store program code in the form of instructions or data structures and that can be read and/or written by a computer (e.g., a communication device, etc., as illustrated by the present application), but is not limited thereto. The memory in embodiments of the present application may also be circuitry or any other device capable of performing memory functions for storing program instructions and/or data. As an example, the memory may be used to store configuration information for the reference signal sequence.

It will be appreciated that when the communication device shown in fig. 8 is configured to perform steps or functions performed by a terminal device, the processor 820 is mainly configured to process a communication protocol and communication data, and control the entire communication device, execute a software program, and process data of the software program. The memory 830 is mainly used for storing software programs and data. The transceiver 810 may include control circuitry for primarily converting baseband signals to radio frequency signals and processing radio frequency signals, and an antenna. The antenna is mainly used for receiving and transmitting radio frequency signals in the form of electromagnetic waves. Input and output devices, such as touch screens, display screens, keyboards, etc., are mainly used for receiving data input by a user and outputting data to the user.

When the communication device is powered on, the processor 820 may read the software program in the memory 830, interpret and execute instructions of the software program, and process data of the software program. When data needs to be transmitted wirelessly, the processor 820 performs baseband processing on the data to be transmitted and outputs a baseband signal to the radio frequency circuit, and the radio frequency circuit performs radio frequency processing on the baseband signal and then transmits the radio frequency signal outwards in the form of electromagnetic waves through the antenna. When data is transmitted to the communication device, the radio frequency circuit receives a radio frequency signal through the antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor 820, and the processor 820 converts the baseband signal into data and processes the data.

In another implementation, the radio frequency circuitry and antenna may be provided separately from the processor performing the baseband processing, e.g., in a distributed scenario, the radio frequency circuitry and antenna may be in a remote arrangement from the communication device.

It will be appreciated that the communication device shown in the embodiment of the present application may also have more components than those shown in fig. 8, and the embodiment of the present application is not limited thereto. The methods performed by the processors and transceivers shown above are merely examples, and reference is made to the methods described above for specific steps performed by the processors and transceivers.

It will be appreciated that in the communication apparatus shown in fig. 8, reference signal sequences, configuration information of reference signal sequences, allocation manners of reference signal sequences, complex values or element values, etc. may be referred to the description in the above method embodiments, and will not be described in detail here.

In another possible implementation manner, in the communications device shown in fig. 7, the processing unit 701 may be one or more logic circuits, and the transceiver unit 702 may be an input-output interface, which is also referred to as a communications interface, or an interface circuit, or an interface, or the like. Alternatively, the transceiver unit 702 may be a transmitting unit and a receiving unit, where the transmitting unit may be an output interface and the receiving unit may be an input interface, and the transmitting unit and the receiving unit are integrated into one unit, for example, an input/output interface. As shown in fig. 9, the communication apparatus shown in fig. 9 includes a logic circuit 901 and an interface 902. That is, the processing unit 701 may be implemented by the logic circuit 901, and the transceiver unit 702 may be implemented by the interface 902. The logic circuit 901 may be a chip, a processing circuit, an integrated circuit, or a system on chip (SoC) chip, and the interface 902 may be a communication interface, an input/output interface, or the like. In the embodiment of the application, the logic circuit and the interface can be coupled with each other. The embodiment of the present application is not limited to the specific connection manner of the logic circuit and the interface.

In some embodiments of the present application, when the communication device is configured to perform the method or function or step performed by the terminal device, the interface 902 is configured to input a downlink physical channel; logic 901 for obtaining a first reference signal sequence based on a plurality of complex values received from the downlink physical channel.

The interface 902 is also used for inputting configuration information of the reference signal sequence, for example.

The logic 901 is specifically configured to obtain a first reference signal sequence according to a plurality of complex values and configuration information received from a downlink physical channel.

The logic circuit 901 is specifically configured to determine a channel response of a downlink physical channel according to a reference signal of the downlink physical channel; and obtaining a first reference signal sequence according to the plurality of complex values received from the downlink physical channel and the channel response of the downlink physical channel.

The logic circuit 901 is specifically configured to perform demodulation processing and decoding processing on a plurality of complex values received from a downlink physical channel, so as to obtain a decoding result; and determining a first reference signal sequence according to the decoding result.

The logic circuit 901 is specifically configured to determine a complex value carried by the downlink physical channel as a preset value; and determining a first reference signal sequence according to preset values corresponding to the complex values carried by the downlink physical channel.

The logic circuit 901 is specifically configured to determine a complex value received from a downlink physical channel as a preset value; and determining a first reference signal sequence according to preset values corresponding to a plurality of complex values received from the downlink physical channel.

Illustratively, the interface 902 is further configured to output an uplink signal according to the first reference signal sequence; or, the method is also used for outputting a downlink signal according to the first reference signal sequence.

In some embodiments of the present application, when the communication apparatus is configured to perform the method or the function or the step performed by the access network device, the logic circuit 901 is configured to map a plurality of complex values to time-frequency resources of a downlink physical channel, where the plurality of complex values are determined according to a reference signal sequence; an interface 902, configured to output the downlink physical channel.

The interface 902 is also used for outputting configuration information of the reference signal sequence, for example.

The logic circuit 901 is specifically configured to perform coding processing and modulation processing on each element value in the reference signal sequence, so as to obtain a plurality of complex values; and mapping the plurality of complex values to time-frequency resources of the downlink physical channel.

The logic circuit 901 is specifically configured to process each element value in the reference signal sequence according to a first channel response, to obtain a plurality of complex values, where the first channel response is a channel response to be experienced by a downlink physical channel; and mapping the plurality of complex values to time-frequency resources of the downlink physical channel.

The logic circuit 901 is specifically configured to quantize an element value in the reference signal sequence to a preset value; obtaining a plurality of complex values according to preset values corresponding to a plurality of element values in the reference signal sequence; and mapping the plurality of complex values to time-frequency resources of the downlink physical channel.

The communication device shown in fig. 9 may not include a memory; alternatively, the communication device shown in fig. 9 may further include a memory. The embodiment of the present application is not limited as to whether the communication apparatus shown in fig. 9 includes a memory.

Reference may also be made to the above embodiments for a specific implementation of the embodiments shown in fig. 9, which are not described in detail herein. For example, the logic may refer to the description of the processing unit, and the interface may refer to the description of the transceiver unit, which is not described in detail herein.

It may be understood that the communication device shown in the embodiment of the present application may implement the method provided in the embodiment of the present application in a hardware manner, or may implement the method provided in the embodiment of the present application in a software manner, which is not limited to this embodiment of the present application.

The embodiment of the application also provides a wireless communication system, which comprises access network equipment and terminal equipment, wherein the access network equipment and the terminal equipment can be used for executing the method in any of the previous embodiments.

Alternatively, the specific implementation manner of the access network device and the terminal device may refer to the communication devices shown in fig. 7 to 9, and the like, which will not be described in detail herein.

Furthermore, the present application provides a computer program for implementing the operations and/or processes performed by the access network device in the method provided by the present application.

The application also provides a computer program for implementing the operations and/or processes performed by the terminal device in the method provided by the application.

The present application also provides a computer readable storage medium having computer code stored therein which, when run on a computer, causes the computer to perform the operations and/or processes performed by an access network device in the method provided by the present application.

The present application also provides a computer readable storage medium having computer code stored therein, which when run on a computer causes the computer to perform the operations and/or processes performed by the terminal device in the method provided by the present application.

The application also provides a computer program product comprising computer code or a computer program which, when run on a computer, causes operations and/or processes performed by an access network device in a method provided by the application to be performed.

The application also provides a computer program product comprising computer code or a computer program which, when run on a computer, causes operations and/or processes performed by a terminal device in a method provided by the application to be performed.

In the several embodiments provided by the present 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. In addition, 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 elements, or may be an electrical, mechanical, or other form of connection.

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 can be selected according to actual needs to achieve the technical effects of the scheme provided by the embodiment of the application.

In addition, each functional unit in the embodiments 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 integrated units may be implemented in hardware or in software functional units.

The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application is essentially or a part contributing to the prior art, or all or part of the technical solution may be embodied in the form of a software product stored in a readable storage medium, comprising 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 method according to the embodiments of the present application. And the aforementioned readable 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 illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within 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

A method of determining a reference signal sequence, the method comprising:

receiving a downlink physical channel, wherein the downlink physical channel carries a reference signal sequence;

a first reference signal sequence is obtained from a plurality of complex values received from the downlink physical channel.
The method of claim 1, wherein the obtaining the first reference signal sequence from the plurality of complex values received from the downlink physical channel comprises:

determining the channel response of the downlink physical channel according to the reference signal of the downlink physical channel;

the first reference signal sequence is obtained according to a plurality of complex values received from the downlink physical channel and channel response of the downlink physical channel.
The method according to claim 1 or 2, wherein said obtaining a first reference signal sequence from a plurality of complex values received from the downlink physical channel comprises:

Performing demodulation processing and decoding processing on a plurality of complex values received from the downlink physical channel to obtain a decoding result;

and determining the first reference signal sequence according to the coding result.
The method of claim 1, wherein the element values in the first reference signal sequence are complex values received from the downlink physical channel.
The method according to claim 1 or 2, wherein said obtaining a first reference signal sequence from a plurality of complex values received from the downlink physical channel comprises:

obtaining a plurality of complex values carried by the downlink physical channel according to the complex values received from the downlink physical channel;

judging a complex value carried by the downlink physical channel as a preset value;

and determining the first reference signal sequence according to preset values corresponding to a plurality of complex values carried by the downlink physical channel.
The method of any of claims 1-5, wherein the downlink physical channel carries multiple repetitions of the reference signal sequence.
The method according to any one of claims 1-6, further comprising:

Receiving configuration information of the reference signal sequence;

the obtaining a first reference signal sequence from a plurality of complex values received from the downlink physical channel includes:

and obtaining the first reference signal sequence according to the plurality of complex values received by the downlink physical channel and the configuration information.
The method of claim 7, wherein the configuration information comprises any one or more of the following:

the allocation mode of the reference signal sequence, the time-frequency resource of the downlink physical channel, the mapping sequence of the reference signal sequence on the downlink physical channel, the repetition number of the reference signal sequence on the downlink physical channel, the length of the reference signal sequence, the use configuration of the reference signal sequence or the effective time of the reference signal sequence;

the allocation mode of the reference signal sequence is used for indicating the mode of mapping the reference signal sequence on the downlink physical channel;

the mapping mode of the reference signal sequence on the downlink physical channel comprises the following steps: the reference signal sequence is mapped on the downlink physical channel in the sequence of the first frequency domain and the second time domain, or the reference signal sequence is mapped on the downlink physical channel in the sequence of the first time domain and the second time domain;

The usage configuration of the reference signal sequence includes any one or more of the following information: the time-frequency resource occupied by the reference signal sequence on the downlink physical channel, the configuration type of the reference signal sequence or the port configuration of the reference signal sequence.
The method according to any one of claims 1-8, further comprising:

transmitting an uplink signal according to the first reference signal sequence; or alternatively, the process may be performed,

and receiving a downlink signal according to the first reference signal sequence.
The method according to any of claims 1-9, wherein the reference signal sequence comprises any of a demodulation reference signal, DMRS, sequence, a sounding reference signal, SRS, sequence, or a channel state information, CSI-RS, sequence.
A method of determining a reference signal sequence, the method comprising:

mapping a plurality of complex values to time-frequency resources of a downlink physical channel, wherein the complex values are determined according to a reference signal sequence;

and transmitting the downlink physical channel.
The method of claim 11 wherein the downlink physical channel carries reference signals for the downlink physical channel, the reference signals for the downlink physical channel being used to determine the channel response of the downlink physical channel.
The method according to claim 11 or 12, wherein said mapping the plurality of complex values to time-frequency resources of the downlink physical channel comprises:

performing coding processing and modulation processing on each element value in the reference signal sequence to obtain a plurality of complex values;

and mapping the complex values to time-frequency resources of the downlink physical channels.
The method of claim 11, wherein said mapping the plurality of complex values to time-frequency resources of the downlink physical channel comprises:

processing each element value in the reference signal sequence according to a first channel response, wherein the first channel response is a channel response to be experienced by the downlink physical channel;

and mapping the complex values to time-frequency resources of the downlink physical channels.
The method according to claim 11 or 12, wherein said mapping the plurality of complex values to time-frequency resources of the downlink physical channel comprises:

quantizing an element value in the reference signal sequence to a preset value;

obtaining a plurality of complex values according to preset values corresponding to a plurality of element values in the reference signal sequence;

And mapping the complex values to time-frequency resources of the downlink physical channels.
The method according to any of claims 11-15, wherein the downlink physical channel carries multiple repetitions of the reference signal sequence.
The method according to any one of claims 11-16, further comprising:

and transmitting configuration information of the reference signal sequence.
The method of claim 17, wherein the configuration information comprises any one or more of the following:

the allocation mode of the reference signal sequence, the time-frequency resource of the downlink physical channel, the mapping sequence of the reference signal sequence on the downlink physical channel, the repetition number of the reference signal sequence on the downlink physical channel, the length of the reference signal sequence, the use configuration of the reference signal sequence or the effective time of the reference signal sequence;

the allocation mode of the reference signal sequence is used for indicating the mode of mapping the reference signal sequence on the downlink physical channel;

the mapping sequence of the reference signal sequence on the downlink physical channel comprises the following steps: the reference signal sequence is mapped on the downlink physical channel in the sequence of the first frequency domain and the second time domain, or the reference signal sequence is mapped on the downlink physical channel in the sequence of the first time domain and the second time domain;

The usage configuration of the reference signal sequence includes any one or more of the following information: the time-frequency resource occupied by the reference signal sequence on the downlink physical channel, the configuration type of the reference signal sequence or the port configuration of the reference signal sequence.
The method according to any of claims 11-18, wherein the reference signal sequence comprises any of a demodulation reference signal, DMRS, sequence, a sounding reference signal, SRS, sequence, or a channel state information, CSI-RS, sequence.
A communication device, comprising:

the receiving and transmitting unit is used for receiving a downlink physical channel, wherein the downlink physical channel carries a reference signal sequence;

and the processing unit is used for obtaining a first reference signal sequence according to a plurality of complex values received from the downlink physical channel.
The apparatus of claim 20, wherein the device comprises a plurality of sensors,

the processing unit is specifically configured to determine a channel response of the downlink physical channel according to the reference signal of the downlink physical channel; the first reference signal sequence is obtained according to a plurality of complex values received from the downlink physical channel and channel response of the downlink physical channel.
The apparatus of claim 20 or 21, wherein the device comprises a plurality of sensors,

the processing unit is specifically configured to perform demodulation processing and decoding processing on a plurality of complex values received from the downlink physical channel, so as to obtain a decoding result; and determining the first reference signal sequence according to the coding result.
The apparatus of claim 20, wherein the element values in the first reference signal sequence are complex values carried in the downlink physical channel.
The apparatus of claim 20 or 21, wherein the device comprises a plurality of sensors,

the processing unit is specifically configured to obtain a plurality of complex values carried by the downlink physical channel according to a plurality of complex values received from the downlink physical channel; judging a complex value carried by the downlink physical channel as a preset value; and determining the first reference signal sequence according to preset values corresponding to a plurality of complex values carried by the downlink physical channel.
The apparatus according to any of claims 20-24, wherein the downlink physical channel carries multiple repetitions of the reference signal sequence.
The apparatus of claim 25, wherein the device comprises a plurality of sensors,

The receiving and transmitting unit is further configured to receive configuration information of the reference signal sequence;

the processing unit is specifically configured to obtain the first reference signal sequence according to a plurality of complex values received from the downlink physical channel and the configuration information.
The apparatus of claim 26, wherein the configuration information comprises any one or more of the following:

the allocation mode of the reference signal sequence, the time-frequency resource of the downlink physical channel, the mapping sequence of the reference signal sequence on the downlink physical channel, the repetition number of the reference signal sequence on the downlink physical channel, the length of the reference signal sequence, the use configuration of the reference signal sequence or the effective time of the reference signal sequence;

the allocation mode of the reference signal sequence is used for indicating the mode of mapping the reference signal sequence on the downlink physical channel;

the mapping sequence of the reference signal sequence on the downlink physical channel comprises the following steps: the reference signal sequence is mapped on the downlink physical channel in the sequence of the first frequency domain and the second time domain, or the reference signal sequence is mapped on the downlink physical channel in the sequence of the first time domain and the second time domain;

The usage configuration of the reference signal sequence includes any one or more of the following information: the time-frequency resource occupied by the reference signal sequence on the downlink physical channel, the configuration type of the reference signal sequence or the port configuration of the reference signal sequence.
The apparatus of any one of claims 20-27, wherein,

the receiving and transmitting unit is further configured to transmit an uplink signal according to the first reference signal sequence; or alternatively, the process may be performed,

the receiving and transmitting unit is further configured to receive a downlink signal according to the first reference signal sequence.
The apparatus of any of claims 20-28, wherein the reference signal sequence comprises any one of a demodulation reference signal, DMRS, sequence of sounding reference signals, SRS, or sequence of channel state information, CSI-RS.
A communication device, comprising:

a processing unit, configured to map a plurality of complex values to time-frequency resources of a downlink physical channel, where the plurality of complex values are determined according to a reference signal sequence;

and the receiving and transmitting unit is used for transmitting the downlink physical channel.
The apparatus of claim 30, wherein the downlink physical channel carries a reference signal for the downlink physical channel, and wherein the reference signal for the downlink physical channel is used to determine a channel response of the downlink physical channel.
The apparatus of claim 30 or 31, wherein the device comprises a plurality of sensors,

the processing unit is specifically configured to perform coding processing and modulation processing on each element value in the reference signal sequence, so as to obtain the plurality of complex values; and mapping the plurality of complex values to time-frequency resources of the downlink physical channel.
The apparatus of claim 30, wherein the device comprises a plurality of sensors,

the processing unit is specifically configured to process each element value in the reference signal sequence according to a first channel response, to obtain the multiple complex values, where the first channel response is a channel response to be experienced by the downlink physical channel; and mapping the plurality of complex values to time-frequency resources of the downlink physical channel.
The apparatus of claim 30 or 31, wherein the device comprises a plurality of sensors,

the processing unit is specifically configured to quantize one element value in the reference signal sequence to a preset value, and obtain the multiple complex values according to preset values corresponding to the multiple element values in the reference signal sequence; and mapping the plurality of complex values to time-frequency resources of the downlink physical channel.
The apparatus according to any of claims 30-34, wherein the downlink physical channel carries multiple repetitions of the reference signal sequence.
The apparatus of any one of claims 30-35, wherein,

the transceiver unit is further configured to send configuration information of the reference signal sequence.
The apparatus of claim 36, wherein the configuration information comprises any one or more of the following:

the allocation mode of the reference signal sequence, the time-frequency resource of the downlink physical channel, the mapping sequence of the reference signal sequence on the downlink physical channel, the repetition number of the reference signal sequence on the downlink physical channel, the length of the reference signal sequence, the use configuration of the reference signal sequence or the effective time of the reference signal sequence;

the allocation mode of the reference signal sequence is used for indicating the mode of mapping the reference signal sequence on the downlink physical channel;

the mapping sequence of the reference signal sequence on the downlink physical channel comprises the following steps: the reference signal sequence is mapped on the downlink physical channel in the sequence of the first frequency domain and the second time domain, or the reference signal sequence is mapped on the downlink physical channel in the sequence of the first time domain and the second time domain;

the usage configuration of the reference signal sequence includes any one or more of the following information: the time-frequency resource occupied by the reference signal sequence on the downlink physical channel, the configuration type of the reference signal sequence or the port configuration of the reference signal sequence.
The apparatus of any of claims 30-37, wherein the reference signal sequence comprises any one of a demodulation reference signal, DMRS, sequence of sounding reference signals, SRS, or sequence of channel state information, CSI-RS.
A communication device comprising a processor and a memory;

the memory is used for storing computer execution instructions;

the processor being configured to execute the computer-executable instructions stored in the memory to cause the method of any one of claims 1-10 to be performed; or alternatively, the process may be performed,

the processor is configured to execute the computer-executable instructions stored in the memory to cause the method of any one of claims 11-19 to be performed.
A communication device comprising logic circuitry and an interface, the logic circuitry and the interface coupled;

the interface is used for inputting and/or outputting code instructions;

the logic circuitry is to execute the code instructions to cause the method of any one of claims 1-10 to be performed; or alternatively, the process may be performed,

the logic circuitry is to execute the code instructions to cause the method of any of claims 11-19 to be performed.
A computer-readable storage medium, characterized in that the computer-readable storage medium is for storing a computer program,

the method of any of claims 1-10 when the computer program is executed; or alternatively, the process may be performed,

the method of any of claims 11-19, when the computer program is executed.
A computer program product, characterized in that the computer program product comprises a computer program which, when executed, is adapted to carry out the method according to any one of claims 1-10; alternatively, the method of any of claims 11-19 is performed when the computer is executed.
A computer program, characterized in that the computer program, when executed, is adapted to perform the method according to any one of claims 1-10; alternatively, the method of any of claims 11-19 is performed when the computer is executed.
A communication device for performing the method of any of claims 1-10; alternatively, the communication device is adapted to perform the method of any of claims 11-19.
A wireless communication system, characterized in that the wireless communication system comprises a terminal device for performing the method of any of claims 1-10 and an access network device for performing the method of any of claims 11-19.