CN109217992B

CN109217992B - Transmission method of phase tracking reference signal, communication equipment and storage medium

Info

Publication number: CN109217992B
Application number: CN201710517496.3A
Authority: CN
Inventors: 钟科; 童辉
Original assignee: China Mobile Communications Group Co Ltd; China Mobile Communications Ltd Research Institute
Current assignee: China Mobile Communications Group Co Ltd; China Mobile Communications Ltd Research Institute
Priority date: 2017-06-29
Filing date: 2017-06-29
Publication date: 2022-02-11
Anticipated expiration: 2037-06-29
Also published as: CN109217992A

Abstract

The embodiment of the invention discloses a PTRS transmission method, communication equipment and a storage medium. The transmission method of the PTRS comprises the following steps: s transport streams are selected from the M transport streams to transmit PTRS, wherein S is equal to the number of local oscillators used by the first communication device for transmitting the M transport streams.

Description

Transmission method of phase tracking reference signal, communication equipment and storage medium

Technical Field

The present invention relates to the field of mobile communications technologies, and in particular, to a method for transmitting a Phase-Tracking Reference Signal (PTRS), a communication device, and a storage medium.

Background

The fifth generation (5G) will support full band access for low and high frequencies. The low frequency here may be a carrier with a frequency below 6 Ghz; the high frequency may be a carrier wave having a frequency not lower than 6 Ghz. However, the phase noise problem at high frequencies is very significant. The 5G introduces PTRS specially for estimating and compensating phase noise, carrier frequency offset and Doppler shift. However, how to transmit the PTRS is not specifically defined, and how to transmit the PTRS can ensure that a receiving end can receive the PTRS with the highest quality as possible and the overhead is low, which is a problem to be solved in the prior art.

Disclosure of Invention

In view of the above, embodiments of the present invention are intended to provide a PTRS transmission method, a communication device, and a storage medium, which can be used to at least solve the problem of high overhead of PTRS transmission.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

a first aspect of an embodiment of the present invention provides a method for transmitting a PTRS, which is applied to a first communication device, and includes:

s transport streams are selected from the M transport streams to transmit PTRS, wherein S is equal to the number of local oscillators used by the first communication device for transmitting the M transport streams.

Optionally, the method further comprises:

and when the PTRS is transmitted on the S transport streams, carrying out data transmission or resource punching on the corresponding time-frequency resources of the remaining M-S transport streams.

Optionally, the selecting S transmission streams from the M transmission streams to transmit the PTRS includes at least one of:

when the first communication device uses only one transmission panel and the transmission panel corresponds to one local oscillator, selecting one transmission stream from a plurality of transmission streams corresponding to the transmission panel, and transmitting the PTRS;

when the first communication device uses a plurality of transmission panels and each transmission panel corresponds to a local oscillator shape, selecting a transmission stream from the transmission streams corresponding to each transmission panel, and transmitting the PTRS;

when the first communication device uses a plurality of transmission panels and the plurality of transmission panels correspond to one local oscillator, one transmission stream is selected from transmission streams corresponding to the plurality of transmission panels sharing one local oscillator, and the PTRS is transmitted.

when the transmission state attributes of a plurality of transmission streams sharing the same local oscillator meet preset similar conditions, randomly selecting one transmission stream from the plurality of transmission streams sharing the same local oscillator to transmit the PTRS;

and when the transmission state attributes of the plurality of transmission streams sharing the same local oscillator do not meet the preset similar condition, selecting one transmission stream from the plurality of transmission streams sharing the same local oscillator according to the transmission state attributes, and transmitting the PTRS.

Optionally, when the transmission state attribute of the plurality of transmission streams sharing the same local oscillator does not satisfy the preset similarity condition, selecting one of the plurality of transmission streams sharing the same local oscillator according to the transmission state attribute, and transmitting the PTRS includes at least one of:

selecting a transport stream with the highest modulation and coding level from a plurality of transport streams sharing the same local oscillator to transmit the PTRS;

selecting a transport stream with the largest scheduled bandwidth from a plurality of transport streams sharing the same local oscillator to transmit the PTRS;

and selecting one transmission stream with the minimum subcarrier spacing from a plurality of transmission streams sharing the same local oscillator to transmit the PTRS.

Optionally, the method further comprises:

determining a transmission density of the PTRS according to at least one of modulation and coding levels, the scheduled bandwidth and a subcarrier spacing of the M transmission streams, wherein the transmission density comprises: time domain density and/or frequency domain density;

the selecting S transport streams from the M transport streams to transmit the PTRS includes:

s transport streams are selected from the M transport streams, and the PTRS is transmitted according to the transmission density.

Optionally, the selecting S transport streams from the M transport streams, and transmitting the PTRS according to the transmission density includes at least one of:

selecting a transport stream with the highest modulation coding grade from a plurality of transport streams sharing the same local oscillator, and sending the PTRS according to the time domain density;

selecting a transport stream with the largest scheduled bandwidth from a plurality of transport streams sharing the same local oscillator, and transmitting the PTRS according to frequency domain density;

and selecting one transport stream with the minimum subcarrier spacing from a plurality of transport streams sharing the same local oscillator to transmit the PTRS according to the time domain density.

Optionally, the time domain density is positively correlated with the modulation coding level;

and/or the presence of a gas in the gas,

the frequency domain density is positively correlated with the modulation coding level;

and/or the presence of a gas in the gas,

the frequency domain density is inversely related to the scheduled bandwidth;

and/or the presence of a gas in the gas,

the time domain density is inversely related to the subcarrier spacing;

and/or the presence of a gas in the gas,

the frequency domain density is inversely related to the subcarrier spacing.

The method further comprises the following steps:

when the first communication device is a base station, explicitly or implicitly indicating the transmission density through at least one of a Radio Resource Control (RRC) signaling, Downlink Control Information (DCI), a Media Access Control (MAC) layer signaling or a scheduling instruction of downlink authorized resources;

and when the first communication equipment is user equipment, indicating the sending density to a base station explicitly or implicitly through uplink control information.

A second aspect of the embodiments of the present invention provides a method for transmitting a phase tracking signal PTRS, which is applied to a second communication device, and includes: s transport streams are selected from the M transport streams to receive the PTRS, wherein S is equal to the number of local oscillators used by the first communication device for transmitting the M transport streams.

Optionally, the method further comprises:

and when the PTRS is received on the selected S transmission streams, receiving data from the corresponding time frequency resources of the rest M-S transmission streams or not receiving data on the corresponding time frequency resources of the rest M-S transmission streams.

A third aspect of an embodiment of the present invention provides a communication device, including:

the transceiver is used for carrying out information interaction with other communication equipment;

and the first processor is connected with the transceiver and is used for realizing the transmission method of any one or more PTRSs by executing a computer program.

A communication apparatus according to a fourth aspect of an embodiment of the present invention includes: a second processor and a computer program;

the second processor is configured to implement a transmission method of any one or more of the PTRS described above by executing the computer program.

A fifth aspect of embodiments of the present invention is a computer storage medium storing a computer program, which when executed by a processor, is capable of implementing any one or more of the foregoing PTRS transmission methods.

In the PTRS transmission method, the communication device, and the storage medium according to embodiments of the present invention, during multi-stream transmission, a transport stream equal to local oscillator data used in multiple transport streams is selected according to the number of local oscillators used in the multiple transport streams to transmit the PTRS. In this way, the PTRS does not need to be transmitted on each transport stream, which can reduce the number of PTRS transmission streams, simplify PTRS transmission, and reduce hardware resources and transmission resources required for PTRS transmission, where the transmission resources may include: time frequency resources, code resources and the like, thereby achieving the effect of reducing the overhead of PTRS.

Drawings

Fig. 1 is a flowchart illustrating a first method for transmitting a PTRS according to an embodiment of the present invention;

fig. 2 is a flowchart illustrating a second method for transmitting a PTRS according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a communication device according to an embodiment of the present invention;

fig. 4 is a diagram illustrating a first transmission status attribute and a transmission density according to an embodiment of the present invention;

fig. 5 is a diagram illustrating a second transmission status attribute and a transmission density according to an embodiment of the present invention.

Detailed Description

The technical solution of the present invention is further described in detail with reference to the drawings and the specific embodiments of the specification.

As shown in fig. 1, the present embodiment provides a PTRS transmission method, applied to a first communication device, including:

selecting S transmission streams from M transmission streams to transmit PTRS, wherein S is equal to the number of local oscillators used by the first communication device for transmitting the M transmission streams.

In this embodiment, the first communication device may be a base station or a user equipment.

In this embodiment, when the value of M is not less than 2, data transmission of M transport streams is performed, which is multi-stream transmission. And a plurality of transmission streams in the multi-stream transmission adopt the same time-frequency resource, and synchronously transmit data in the modes of space division multiplexing and the like. For example, the base station simultaneously transmits a plurality of spatially orthogonal beams to the terminal, and if one beam corresponds to one transmission stream, multi-stream transmission is implemented by data transmission of the plurality of beams.

In the present embodiment, the PTRS transmission is mainly used for estimation and compensation of phase noise, carrier frequency offset, and doppler shift. In order to determine the local oscillation phase noise and the like of each transmission stream, PTRS transmission should be performed on each transmission stream, so as to determine and compensate the estimated values of the phase noise, carrier frequency offset and doppler shift corresponding to each transmission stream. In this embodiment, only S transport streams equal to the number of local oscillators are selected from the M transport streams to perform the PTRS transmission.

In this embodiment, the local oscillation noise estimation value obtained based on the PTRS transmitted in one stream transmission may be used in one terminal for a plurality of subsequent processes such as local oscillation noise removal in a transport stream using the same local oscillator as that of the transport stream.

In this embodiment, selecting S transmission streams to transmit PTRS may specifically include:

and selecting the antenna port corresponding to the S transmission streams as the antenna port of the PTRS, and transmitting the PTRS. In this embodiment, the antenna port is a logical concept, and the antenna port and the antenna element of the first communication device have a certain mapping relationship, for example, the mapping relationship may include: a precoding matrix controlling beamforming of the antenna elements. When PTRS is transmitted, the PTRS is directly transmitted by using S transmission streams, and the method at least comprises the following steps: and performing beam forming of the antenna elements by using the antenna ports of the S transmission streams, and further transmitting the corresponding PTRS.

For example, if the conversion from the baseband signal to the radio frequency signal of the M transmission streams is implemented by S local oscillators, S transmission streams are required to transmit the PTRS for estimation and compensation of phase noise, carrier frequency offset, and doppler shift. In general, one local oscillator is used for converting a baseband signal of one or more transport streams into a radio frequency signal, so that compared with the transmission of a PTRS on each transport stream, the transport stream for transmitting the PTRS is reduced, thereby simplifying the transmission times or transmission number of the PTRS, simplifying the reception of the second communication device, and reducing the resource consumption of PTRS transmission. Here, the resource consumption may include time-frequency resources and/or sequence resources for transmitting the PTRS. The PTRS may be generated based on a corresponding reference sequence.

In this embodiment, the local oscillator performs conversion from a baseband signal to a radio frequency signal, and includes: performing up-conversion on the baseband signal to obtain the radio frequency signal; and obtaining the baseband signal after down-converting the radio frequency signal.

In some embodiments, the method further comprises:

In this embodiment, if S transport streams are selected to transmit the PTRS, and the remaining M-S transport streams transmit the PTRS in S transport streams, no data transmission, that is, resource punching, may be performed on corresponding time-frequency resources, so that, compared to transmitting the PTRS in each transport stream, the transmission operation of the first communication device may be reduced, power consumption and load capacity of the first communication device may be reduced, and interference when the PTRS is transmitted in S transport streams may also be reduced. If the service data is transmitted on the time frequency resources corresponding to the remaining M-S transport streams, the time frequency resources corresponding to the remaining M-S transport streams are obviously added for transmitting the service data, the capacity of the communication system is increased, and the effective utilization rate of the time frequency resources is improved. And when the remaining M-S transmission streams carry out PTRS transmission on the S transmission streams, carrying out service data transmission, and facilitating data decoding of the second communication device, wherein the first communication device and the second communication device can negotiate an interference suppression algorithm or an interference elimination algorithm in advance so as to facilitate correct decoding of the PTRS and the service data by the second communication device. In some embodiments, the interference suppression method and the interference elimination method may be predefined and known to the first communication device and the second communication device. Common algorithms for interference rejection and suppression may include: interference rejection ratio combining algorithm (IRC), maximum ratio combining algorithm (IRC), zero forcing algorithm (ZF), minimum mean square error algorithm (MMSE), etc., and the specific implementation is not limited to these algorithms.

Optionally, the first communication device may be a base station or a user equipment. If the first communication equipment is a base station, the second communication equipment receiving the PTRS is user equipment; and if the first communication equipment is user equipment, the second communication equipment is a base station.

In specific implementation, according to the different and same range of the transmission scene, one or more of the following optional cases:

the first method comprises the following steps:

when the first communication device uses only one transmission panel and the transmission panel corresponds to one local oscillator, one transmission stream is selected from among transmission streams corresponding to the transmission panel to transmit the PTRS. That is, when the first communication device uses a multi-input multi-output transmission scenario (SU-MIMO) of a single user equipment with a single transmission panel, which is equivalent to that M transmission streams are all multiple transmission streams transmitted to one user equipment by using one transmission panel, in this embodiment, one transmission stream may be randomly selected from the M transmission streams to transmit the PTRS. Of course, in some embodiments, in order to reduce the problem of difficult reception of the ue due to random selection, one of the M transport streams may be selected according to the stream number of the transport stream, and the like, to transmit the PTRS.

And the second method comprises the following steps:

when the first communication device uses a plurality of transmission panels each corresponding to a local oscillator shape, one transport stream is selected from among transport streams corresponding to each of the transmission panels to transmit the PTRS.

For example, if 3 transmission panels are currently used and 3 local oscillators are used for multi-stream transmission, a PTRS of 3 transport streams is required, and a PTRS corresponding to an nth transmission panel can only select one transport stream from one or more transport streams corresponding to the nth transmission panel to transmit the PTRS.

Further, the method can be divided into independent beamforming and joint beamforming according to the beamforming method of the transmitting panel.

When the first communication device uses a plurality of transmission panels, and the plurality of transmission panels correspond to a local oscillator and each transmission panel performs beamforming independently, one transmission stream is selected from a plurality of transmission streams corresponding to each transmission panel, and the PTRS is transmitted. The corresponding transmission scenario here is: the first communication device uses a plurality of sending panels to perform a multi-input and multi-output transmission scenario for one user device. And the transmit panels are different corresponding to the local oscillators and are beamformed independently. Each transmit panel corresponds to the transmission of one PTRS.

When the first communication device uses a plurality of transmitting panels, and the plurality of transmitting panels correspond to a local oscillator and the transmitting panels jointly perform beamforming, one transmission stream is selected from the transmission streams corresponding to each transmitting panel to transmit the PTRS.

And the third is that:

when the first communication device uses a plurality of transmission panels and the plurality of transmission panels correspond to one local oscillator, one transmission stream is selected from transmission streams corresponding to the plurality of transmission panels sharing the one local oscillator to transmit the PTRS.

In this embodiment a user equipment may use multiple transmit panels and multiple local oscillators. For example, the transmission panel a and the transmission panel B share one local vibrator, and in order to reduce transmission of PTRS, one of a plurality of transport streams corresponding to the transmission panel a and the transmission panel B may be selected and transmitted.

In some embodiments, transmission channels used by multiple transmission streams sharing the same local oscillator have high similarity, and at this time, the first communication device may select the same transmission state attribute to perform multi-stream transmission, and at this time, requirements of the multiple transmission streams on the transmission density of the PTRS may be the same, but in some cases, the transmission channels have many differences, the first communication device may select different transmission state attributes to perform multi-stream transmission, and the transmission densities of the multiple transmission streams on the PTRS may be inconsistent. In this embodiment, to simplify transmission of the PTRS on one hand and meet transmission requirements of different transmission status attributes on the PTRS on one hand, the selecting S transmission streams from the M transmission streams to transmit the PTRS includes at least one of:

and when the transmission state attributes of the plurality of transmission streams sharing the same local oscillator meet preset similar conditions, randomly selecting one transmission stream from the plurality of transmission streams sharing the same local oscillator, and transmitting the PTRS. For example, if modulation and coding levels (MCSs) of transmission streams of a plurality of local vibrators are the same or a level difference is not greater than a level threshold, the preset similarity condition may be considered to be satisfied. For example, if the bandwidths of the transmission streams scheduled by the multiple local vibrators are equal or the bandwidth difference value is not greater than the bandwidth difference threshold, the preset similarity condition may be considered to be satisfied. For another example, if the subcarrier intervals used by the transmission streams sharing one local vibrator are equal or the difference between the subcarrier intervals is within a preset range, the preset similar condition may be considered to be satisfied, otherwise, the similar condition may not be satisfied. If the preset similar condition is met, one transport stream can be randomly selected from a plurality of transport streams sharing one local vibrator for transmission of the PTRS, or a transport stream with the smallest stream number or the largest stream number can be selected for transmission of the PTRS according to a preset selection mode, for example.

And if the preset similar condition is not met, selecting one of the plurality of transmission streams sharing the same local oscillator according to the transmission state attribute to send the PTRS when the transmission state attribute of the plurality of transmission streams sharing the same local oscillator does not meet the preset similar condition.

For example, when a plurality of transport streams sharing one local oscillator are different in MCS, one transport stream is selected according to the MCS to transmit the PTRS, so that the problem that the transport stream with a smaller or larger stream number is randomly selected or directly selected to cause the PTRS transmission which does not meet the requirement of the corresponding transmission state attribute is solved, and the transmission quality of the required PTRS is ensured.

Further, when the transmission state attributes of the plurality of transmission streams sharing the same local oscillator do not satisfy the preset similarity condition, selecting one of the plurality of transmission streams sharing the same local oscillator according to the transmission state attributes, and transmitting the PTRS, the method includes at least one of:

selecting a transport stream with the highest MSC from a plurality of transport streams sharing the same local oscillator, and transmitting the PTRS;

selecting a transmission stream with the largest scheduled bandwidth from a plurality of transmission streams sharing the same local oscillator, and transmitting the PTRS; the scheduled bandwidth here may be determined according to an overall bandwidth corresponding to Resource Blocks (RBs) allocated to each transmission stream;

and selecting one transmission stream with the minimum subcarrier spacing from a plurality of transmission streams sharing the same local oscillator, and transmitting the PTRS.

In this embodiment, the transmission status attribute may include: one or more of MCS, scheduled bandwidth, and subcarrier spacing, but not limited to MCS, scheduled bandwidth, and subcarrier spacing.

In some cases, the transport streams involved in the multiflow correspond to multiple ues, and usually the ues move within a cell formed by the base station, so that the ues are located at different distances from the base station, and in order to ensure the reception quality of each ue, different modulation and coding levels may be used to transmit the corresponding transport streams. While different modulation and coding levels have different requirements on the transmission density of PTRS.

In some embodiments, when performing multiflow transmission, the base station and the terminal may further allocate carrier parameters such as subcarriers and subcarrier intervals for performing data transmission on each transmission stream according to parameters such as a currently available bandwidth and/or a quality of service (QoS) level of currently transmitted data. The greater the subcarrier spacing, the lower the probability of mutual interference between subcarriers, and a relatively lower PTRS transmission density may be required at this time.

In other embodiments, the scheduled bandwidth of one transmission stream is different, and in this embodiment, if the scheduled bandwidth is larger, the transmission density of PTRS needs to be generally larger.

In this embodiment, the transmission density may include: time domain density and/or frequency domain density. The time domain density may include: a transmission period in the time domain, a transmission time interval between two adjacent times. The frequency domain density may include: the frequency domain interval, or frequency domain period, between the frequency bands in which the two PTRSs are transmitted.

In this embodiment, the overall number of PTRS transmissions is determined by both the frequency domain density and the time domain density.

In view of this, as shown in fig. 2, the method may include:

step S101: determining a transmission density of the PTRS according to at least one of modulation and coding levels, the scheduled bandwidth and a subcarrier spacing of the M transmission streams, wherein the transmission density comprises: time domain density and/or frequency domain density;

step S102: s transport streams are selected from the M transport streams, and the PTRS is transmitted according to the transmission density.

In general, the modulation and coding levels of the transmission streams corresponding to one ue may be the same, or the modulation and coding levels of spatial channel ues located in adjacent locations or quasi co-located may be the same.

In this embodiment, the transmission density of PTRS is determined according to the modulation and coding level, the bandwidth scheduled by each transport stream, and the subcarrier spacing.

Specifically, for example, the transmission density of the PTRS, e.g., the time domain density, may be determined according to the highest modulation and coding level of a plurality of transmission streams sharing one local oscillator; the maximum bandwidth scheduled by the multiple transport streams of a local oscillator determines the transmission density, e.g., frequency domain density, of the PTRS. For another example, the transmission density of the PTRS, e.g., the time domain density, is determined according to the minimum subcarrier spacing of a plurality of transmission streams sharing a local oscillator.

Correspondingly, the step S102 includes at least one of:

selecting a transport stream with the highest modulation and coding level from a plurality of transport streams sharing the same local oscillator, and sending the PTRS according to the time domain density;

selecting the transport stream with the largest scheduled bandwidth from a plurality of transport streams sharing the same local oscillator, and sending the PTRS according to the frequency domain density;

and selecting the transmission stream with the minimum interval of the scheduled subcarriers from a plurality of transmission streams sharing the same local oscillator, and transmitting the PTRS according to the time domain density.

In this embodiment, when PTRS transmission is performed, a transport stream with the highest modulation and coding level, a transport stream with the largest scheduled bandwidth, or a transport stream with the smallest subcarrier spacing is selected from among multiple transport streams sharing the same local oscillator, and the PTRS transmission is performed according to the transmission density determined in step S101, so that PTRS transmission of all transport streams sharing the same local oscillator can be ensured to meet requirements, and meanwhile, the total number of PTRS transmissions, transmission resource consumption, and the like are reduced as a whole.

Optionally, the time domain density is positively correlated with the modulation coding level; and/or, the frequency domain density is positively correlated with the modulation coding level; and/or, the frequency domain density is inversely related to the scheduled bandwidth; and/or, the time domain density is inversely related to the subcarrier spacing; and/or the frequency domain density is inversely related to the subcarrier spacing.

The positive correlation in this embodiment may include: a direct proportion relation; the negative correlation may include: an inverse relationship, etc.; however, the specific implementation is not limited to the direct relation and the inverse relation.

Prior to transmitting the PTRS, the method further comprises:

In this embodiment, before sending the PTRS, the second communication device is informed of the sending density of the PTRS through sending of the indication signaling, and then the second communication device is facilitated to receive the PTRS based on the sending density.

In this embodiment, the explicit indication may be: and directly carrying indication information in the indication signaling, wherein the indication information explicitly indicates the sending density.

The implicit indication may be: the transmission density has a correspondence with the contents of certain specific fields in the indication signaling, and this correspondence is known in advance by the first communication device and the second communication device. If the first communication device determines the transmission density of the specific reference signal and the PTRS, the second communication device may be informed implicitly through a specific field carrying other content in the indication signaling.

In some embodiments, both explicit and implicit indications may be combined. For example, one part of the transmission density is explicitly indicated by the indication signaling, and the other part of the transmission density is implicitly indicated by the indication signaling and the corresponding relationship.

The embodiment of the invention also provides a transmission method of the phase tracking signal PTRS, which is applied to second communication equipment and comprises the following steps:

selecting S transport streams from M transport streams to receive PTRS, wherein S is equal to the number of local oscillators used by the first communication device for transmitting the M transport streams.

In this embodiment, the second communication device is a receiving device, and S transport streams are selected from M transport streams to receive PTRS, and only S PTRS smaller than M need to be received, thereby reducing the number of transport streams of PTRS.

Optionally, the method further comprises: and when the PTRS is received on the selected S transmission streams, receiving data from the corresponding time frequency resources of the rest M-S transmission streams or not receiving data on the corresponding time frequency resources of the rest M-S transmission streams.

In some embodiments, the method further comprises: receiving indication signaling; when the second communication device is a terminal, the indication signaling may be one or more of RRC, DCI, MAC CE, and scheduling signaling of downlink grant resources, and the indication signaling explicitly or implicitly indicates the transmission density; the description of the transmission density in this embodiment can be referred to the previous embodiment and is not repeated here. And if the second communication equipment is the base station, the indication signaling is UCI.

The method further comprises the following steps:

and receiving the PTRS transmitted by the first communication equipment according to the transmission density.

The selecting S of the transport streams from the M transport streams, receiving the PTRS, including at least one of:

selecting a transport stream with the highest modulation and coding level from a plurality of transport streams of which the first communication equipment shares the same local oscillator, and receiving the PTRS according to the time domain density;

selecting a transport stream with the largest scheduled bandwidth from a plurality of transport streams of which the first communication equipment shares the same local oscillator, and receiving the PTRS according to frequency domain density;

and selecting one transport stream with the minimum subcarrier spacing from a plurality of transport streams sharing the same local oscillator by the first communication equipment to receive the PTRS according to the time domain density.

As shown in fig. 3, an embodiment of the present invention provides a communication device, including:

the transceiver 110 is used for information interaction with other communication devices;

the first processor 120 is connected to the transceiver 110, and configured to implement the PTRS transmission method according to one or more of the foregoing technical solutions by executing a computer program.

The communication device here may be the first communication device or the second communication device. And if the first communication equipment is the base station, the second communication equipment is the terminal, and if the first communication equipment is the terminal, the second communication equipment is the base station.

The transceiver 110 may correspond to a transceiving antenna or a transceiving array, etc., with data transmission. The aforementioned transmission panel is an integral part of the transceiver 110.

In this embodiment, the first processor 120 may be a Central Processing Unit (CPU), a Microprocessor (MCU), a Digital Signal Processor (DSP), an Application Processor (AP), a programmable logic array (PLC), an Application Specific Integrated Circuit (ASIC), or the like.

The first processor 120 may implement one or more of the aforementioned transmission methods of the PTRS through execution of a computer program. Correspondingly, the transceiver 110 may be located in a terminal for communicating with a base station, and may also be located in a base station for communicating with a terminal.

The first communication equipment and the second communication equipment can form a mobile communication system, and through the execution of the steps, the PTRS transmission is simply and conveniently realized on one hand, and the receiving quality of the second communication equipment to the PTRS is ensured on the other hand.

The present embodiment provides a communication apparatus, including: a second processor and a computer program;

the second processor is configured to implement the PTRS transmission method provided by implementing any one or more of the foregoing technical solutions by executing the computer program.

The present embodiment provides a communication device, and the first communication device includes a second processor and a computer program. The computer program may be a computer executable code executed by said second processor. The second place.

An embodiment of the present invention further provides a computer storage medium, where a computer program is stored, and after the computer program is executed by a processor, the PTRS transmission method provided in any one or more of the foregoing technical solutions can be implemented.

The computer storage medium can be various storage media such as a read-only storage medium, a flash memory, a mobile hard disk, an optical disk or a magnetic tape, and can be selected as a non-transitory storage medium.

Several specific examples are provided below in connection with any one or more of the embodiments described above:

the application provides a multi-stream transmission method of the PTRS in 5G aiming at the multi-stream transmission problem of the PTRS in 5G and aiming at different scenes of a single user and multiple users (two actual scenes that the multi-stream transmission channel condition is consistent and the multi-stream transmission channel condition is different) respectively according to the characteristic of local oscillator phase noise of a local oscillator. The method can effectively reduce the overhead of PTRS. Moreover, this example also proposes a time domain and frequency domain design criterion for PTRS. Several specific examples are provided below for different transmission scenarios:

example 1:

the present example is directed to channel conditions being similar (i.e., the aforementioned transmission state attributes are the same or similar), and includes:

when the channel conditions of a plurality of transmission streams are consistent, the PTRS only needs to transmit a corresponding number of transmission PTRS on the same number of transmission streams as the local oscillators used by the base station, and the rest of the transmission streams can be resource-punctured (i.e. orthogonal transmission) or used for transmitting data (i.e. non-orthogonal transmission) only according to the transmission streams of the transmitted PTRS. Here, the puncturing of resources may include: and reserving time-frequency resources for transmitting the PTRS on other transmission streams, and transmitting data in a frequency division multiplexing, time division multiplexing or code division multiplexing mode and the like. Here, when the PTRS is transmitted, the data transmitted by the other transport stream may be service data related to a specific application or service, and may further include control signaling related to transmission control, and the like.

The downlink transmission of data from the base station to the user equipment and the downlink transmission of data from the user equipment to the base station are discussed separately below.

Downlink transmission:

when the channel conditions of the multi-stream transmission of the base station are consistent, the PTRS only needs to transmit the corresponding number of transmission PTRS on the same number of transmission streams as the local oscillators used by the base station, and the rest of transmission streams can be punctured (i.e. orthogonal transmission) or used for transmitting data (i.e. non-orthogonal transmission) only according to the transmission streams of the transmitted PTRS

For a downlink single-user multiple-input multiple-output (SU-MIMO) transmission scenario:

1) if the situation is a single transmitting panel (assuming that one transmitting panel has one local oscillator), only one PTRS antenna port for transmitting PTRS is needed at this time, the PTRS antenna port is mapped onto one of the transmission streams for transmission, and the rest of the transmission streams can be punctured or used for transmitting data only according to the transmission stream of the transmitted PTRS.

2) If the condition is the multi-transmission panel, independent beam forming is carried out on the multi-transmission panel (assuming that one transmission panel and one local oscillator are used); the situation is similar to 1) above.

3) If the situation is the situation of multiple sending panels, the multiple sending panels are combined with beam forming (assuming that one sending panel is provided with one local oscillator); the situation is similar to 1) above, but the phase difference between the multiple transmission panels is taken into account

For a multiple-input multiple-output (MU-MIMO) transmission scenario for downlink multiuser devices:

if the situation is a single-transmission panel situation (assuming that one transmission panel has one local oscillator), if the beam can be used to form perfect space division, each user equipment can perform PTRS transmission according to the SU-MIMO situation; if perfect space division cannot be formed by using the beam forming, each user equipment can transmit the PTRS according to the SU-MIMO condition, and because the channel conditions of each user are consistent, orthogonal or non-orthogonal transmission is needed among antenna ports of each user for transmitting the PTRS. The perfect space division is that the transmission spaces or transmission channels of a plurality of transmission streams using the same time-frequency resource are not intersected, namely are not interfered mutually, otherwise, the perfect space division is considered to be imperfect.

If it is a multiple transmit panel case (assuming one transmit panel with one local oscillator, each transmit panel supporting one user equipment), it is similar to the SU-MIMO case described above.

When the channel conditions traversed by the terminal multi-transmission stream are highly correlated, for example, the ue is in a space with a small range, for example, all the ues are indoors, the channel conditions of the multi-stream transmission may be considered to be consistent, that is, the Channel Quality Indicators (CQIs) of the streams are the same, and the scheduled MCS is the same.

And (3) uplink transmission:

when the channel conditions of the multi-stream transmission of the user equipment are consistent, the PTRS only needs to transmit the corresponding number of PTRS antenna ports on the same number of transmission streams as the number of local oscillators used by the user equipment, and the remaining transmission streams may be punctured (i.e., orthogonal transmission) or used to transmit data (i.e., non-orthogonal transmission) only according to the transmission streams of the transmitted PTRS. The number of local oscillators is the number of local oscillators.

The transmission of the specific PTRS coincides with the downlink transmission and is not repeated here.

For downlink transmission, when the channel conditions of multiflow transmission are different, the design principle of multiflow PTRS is as follows:

for downlink SU-MIMO:

in the case of a single transmit panel (assuming one transmit panel and one local oscillator), the required time-frequency density PTRS antenna ports need only be transmitted according to the transport stream (assumed to be transport stream a) of the highest MCS and/or maximum scheduled bandwidth and/or minimum subcarrier spacing, while the other transport stream (B) ignores itself entirely the required time-frequency density, either punctured (i.e., orthogonal transmission) or used entirely to transmit its data (i.e., non-orthogonal transmission) based on the transport stream a.

If the situation is the case of multiple transmitting panels, the multiple transmitting panels carry out independent beam forming (assuming that one transmitting panel is provided with one local oscillator); the case is similar to 1) above

If the situation is the case of multiple transmitting panels, the multiple transmitting panels jointly form beams (assuming that one transmitting panel is provided with one local oscillator); the situation is similar to 1) above, but the phase difference between the multiple transmission panels is taken into account. Such as the introduction of phase differences across multiple transmit panels, so that the multiple transmit panels jointly modulate and transmit out one beam.

Example 2:

this example is directed to channel conditions that are similar (i.e., the aforementioned transmission state properties are not the same or similar), and includes:

for downlink MU-MIMO:

in case of single transmit panel (assuming one transmit panel with one local oscillator) and there is a near-far effect, i.e. the MCS of the near ue is high and the MCS of the far ue is small.

If the mutual interference of the spatial multiplexing of the beams corresponding to different transmission streams is lower than the preset interference threshold, for example, the transmission spaces of different transmission streams are completely different, each user equipment may perform PTRS transmission according to the SU-MIMO condition.

If the mutual interference of the spatial multiplexing of the beams corresponding to different transmission streams is not lower than the preset interference threshold, the orthogonalized transmission among the user equipments needs to be considered, but because the estimation accuracy of the user of the low coding modulation scheme MCS stream to the relative noise is lower than that of the user of the high MCS stream, the user of the high MCS stream can be supported to transmit data at the RE position where the user of the low MCS stream transmits PTRS (or does not transmit at all), so as to improve the throughput.

When the PTRS multi-transport stream is transmitted, different transport streams have different CQI of channels, so that the supported bandwidth (the number of RBs scheduled) and MCS are different (for example, multiple users scheduled in MU-MIMO are closer and farther, so that some users have good channel conditions, can transmit a higher MCS, and some users have poor channel conditions, and can only transmit a lower MCS). At this time, the PTRS frequency domain and time domain densities required by each transport stream are different (for example, the frequency domain density is one PTRS per x PRBs; the time domain density is continuous, every 2 OFDM symbols, every 4, 8, etc. or no PTRS is required).

The higher the MCS scheduled, the greater the time and/or frequency domain density of PTRS required

The larger the scheduled bandwidth, the lower the frequency domain density of the required PTRS

The larger the scheduled subcarrier spacing, the lower the time-domain density and/or frequency-domain density of the required PTRS

For uplink transmission, when the channel conditions of multiflow transmission are different, the design principle of multiflow PTRS is as follows:

for uplink SU-MIMO:

in case of a single transmit panel case (assuming one transmit panel and one local oscillator), the present example proposes that only the required time-frequency density PTRS antenna port needs to be transmitted for that transport stream (assumed to be transport stream a) at the highest MCS and/or maximum scheduled bandwidth and/or minimum subcarrier spacing, while the other transport streams(s) ignore the required time-frequency density themselves completely, puncturing (i.e. orthogonal transmission) or transmitting their data completely (i.e. non-orthogonal transmission) only on the basis of the above-mentioned transport stream a.

If the situation is the case of multiple transmitting panels, the multiple transmitting panels carry out independent beam forming (assuming that one transmitting panel is provided with one local oscillator); the situation is similar to 1) above.

In the case of multiple transmit panels, multiple transmit panels combine beamforming (assuming one transmit panel and one local oscillator). The situation is similar to 1) above, but the phase difference between the multiple transmission panels is taken into account.

For uplink MU-MIMO:

if the near-far effect exists, the users of the high MCS flow can be supported to transmit data at the RE position where the users of the low MCS flow transmit PTRS (or do not need to transmit at all), so as to improve the throughput.

The time domain density of the PTRS is related to MCS and/or SCS, and the specific design criteria are as follows:

the time domain density of PTRS is related to MCS, and the relationship between the two is as follows:

table 1 is an example of the relationship of the time domain density of PTRS to MCS:

wherein, MCS1, MCS2, MCS3 and MCS4 are all supported MCSs divided into 5 sub-ranges by MCS1, MCS2, MCS3 and MCS4 as boundary points. This is just an example, and there may be less than this or more than this in practice, depending on the actual situation;

and wherein A, B, C take on the value (0)<A< B<C<1) This may be different depending on the actual situation. For example, a =

， B=

， C=

Or A =

， B=

， C=

Etc., wherein

Meaning that the time domain is put into PTRS every x symbols.

When the relation between the PTRS time domain density and the MCS is determined by using table 1, the relation may also be affected by SubCarrier Spacing (SCS), as shown in fig. 4 below:

fig. 4 shows the time domain density of PTRS versus MCS and/or SCS. The a, B, C, …, I in fig. 4 may be different depending on the actual situation.

In fig. 4, the subcarrier spacings denoted by X1, X2, and X3 may be 60, 120, and 240, respectively; but not limited thereto, X1 is less than X2; x2 is less than X3. X1, X2, X3 are only examples, and there may be fewer or more than these values in practice, depending on the circumstances

The frequency domain density of PTRS is related to the scheduled bandwidth and/or MCS, and the specific design criteria are:

the frequency domain density of PTRS is related to the scheduled bandwidth, and the relationship between the two is as follows:

table 2 is an example of a PTRS frequency domain density versus scheduled bandwidth relationship:

the whole bandwidth is divided into 5 sub-ranges by taking NRB1, NRB2, NRB3 and NRB4 as boundary points through NRB1, NRB2, NRB3 and NRB 4. This is merely an example, and there may be fewer than this or more than this in practice, depending on the circumstances.

And wherein a, b, c, d, e (0. ltoreq. a)<b<c<d<e) The value of (b) may be different depending on the actual situation. For example, a =

， b=

，d=

，e=

Or a =

， b=

，d=

，e=

Etc., wherein a =

Indicating that there are x REs as PTRS within the scheduled bandwidth (one RB contains 12 REs in the frequency domain, measured as the number of RBs).

When the relationship between the PTRS frequency domain density and the scheduled bandwidth is determined using table 2, the relationship may also be affected by MCS, as shown in fig. 5 below. Fig. 5 is a plot of frequency domain density of PTRS versus scheduled bandwidth and/or MCS. The a, b, c, …, o in fig. 5 may be different depending on the actual situation.

In this example, the time domain density and/or the frequency domain density of the PTRS may be respectively indicated to the opposite end in an explicit and/or implicit and/or explicit and implicit manner through an RRC signaling, a control unit of the MAC, a downlink control information DCI, and/or a downlink signaling of resource scheduling of the user equipment, or through an uplink signaling such as UCI. When the local terminal is the base station, the user equipment is the opposite terminal; and if the local terminal is the user equipment, the base station is the opposite terminal.

In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above-described device embodiments are merely illustrative, for example, the division of the unit is only a logical functional division, and there may be other division ways in actual implementation, such as: multiple units or components may be combined, or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the coupling, direct coupling or communication connection between the components shown or discussed may be through some interfaces, and the indirect coupling or communication connection between the devices or units may be electrical, mechanical or other forms.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, that is, 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 purpose of the solution of the embodiment.

In addition, all the functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may be separately used as one unit, or two or more units may be integrated into one unit; the integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.

Those of ordinary skill in the art will understand that: all or part of the steps for implementing the method embodiments may be implemented by hardware related to program instructions, and the program may be stored in a computer readable storage medium, and when executed, the program performs the steps including the method embodiments; and the aforementioned storage medium includes: a mobile storage device, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. A transmission method of a phase tracking signal PTRS is applied to a first communication device and comprises the following steps:

selecting S transmission streams from M transmission streams to transmit PTRS, wherein S is equal to the number of local oscillators used by the first communication device for transmitting the M transmission streams;

wherein the selecting S transport streams from the M transport streams to transmit the PTRS includes:

selecting one transport stream with the minimum subcarrier spacing from a plurality of transport streams sharing the same local oscillator to transmit the PTRS;

and the transmission state attributes of a plurality of transmission streams sharing the same local oscillator do not meet preset similar conditions.

2. The method of claim 1,

the method further comprises the following steps:

3. The method according to claim 1 or 2,

the selecting S transmission streams from the M transmission streams to transmit the PTRS comprises at least one of the following steps:

when the first communication device uses a plurality of transmission panels and the plurality of transmission panels correspond to one local oscillator, one transmission stream is selected from transmission streams corresponding to the plurality of transmission panels sharing the one local oscillator, and the PTRS is transmitted.

4. The method according to claim 1 or 2,

the method further comprises the following steps:

5. The method of claim 4,

the selecting S transport streams from the M transport streams, and transmitting the PTRS according to the transmission density, includes at least one of:

6. The method of claim 4,

the time domain density is positively correlated with the modulation coding level;

and/or the presence of a gas in the gas,

the frequency domain density is inversely related to the scheduled bandwidth;

and/or the presence of a gas in the gas,

the time domain density is inversely related to the subcarrier spacing;

and/or the presence of a gas in the gas,

the frequency domain density is inversely related to the subcarrier spacing.

7. A transmission method of a phase tracking signal PTRS is applied to a second communication device and comprises the following steps:

selecting S transmission streams from M transmission streams to receive PTRS, wherein S is equal to the number of local oscillators used by the first communication equipment for transmitting the M transmission streams;

8. The method of claim 7,

the method further comprises the following steps:

9. A communication device, comprising:

a first processor, coupled to the transceiver, for implementing the method provided in any one of claims 1 to 8 by executing a computer program.

10. A communication device, comprising: a second processor and a computer program;

the second processor is configured to implement the method provided in any one of claims 1 to 8 by executing the computer program.

11. A computer storage medium storing a computer program enabling to carry out the method as provided in any one of claims 1 to 8 when executed by a processor.