WO2021056189A1

WO2021056189A1 - Method for processing reference signals, apparatus and system

Info

Publication number: WO2021056189A1
Application number: PCT/CN2019/107536
Authority: WO
Inventors: 史桢宇; 黄甦; 于莹洁
Original assignee: 华为技术有限公司
Priority date: 2019-09-24
Filing date: 2019-09-24
Publication date: 2021-04-01
Also published as: CN114450905A; CN114450905B

Abstract

Disclosed in the present application are a method for processing reference signals, an apparatus and a system. The method comprises: generating a sequence of reference signals, wherein the phase α_{i, l} of a cyclic shift of the sequence of reference signals is related to a random phase factor, i indicates that the reference signals are sent by using an i-th port, and l represents the number of symbols, symbol index or symbol number of the mapping of the sequence; and mapping the sequence onto one or more symbols, and sending same. In the technical solutions provided in the embodiments of the present invention, symbol-level phase rotation is added when generating the sequence of reference signals such that the cyclic shifts of reference signals having different symbols on the same port are different, which may reduce the interference between terminals and improve the accuracy of delay estimation.

Description

Reference signal processing method, device and system

Technical field

This application relates to the field of communication technologies, and in particular to a method, device, and system for processing reference signals.

Background technique

3GPP TR 38.855 clearly defines the positioning technologies supported by the New Radio (NR), such as downlink positioning technology, uplink positioning technology, and uplink and downlink positioning technology. Among them, the uplink positioning and uplink and downlink positioning technologies require the base station to measure the sounding reference signal (SRS) sent by the terminal.

In the existing standard, the number of consecutive symbols in a time slot that supports SRS is 1, 2, 4, 8, 12, the port number is 1, 2, 4, the comb value is 2, 4, 8, and the comb value N represents that the SRS is transmitted at the granularity of every N subcarriers, and the SRS transmitted by N terminals can be divided into frequency. For example, as shown in Figure 1, take the comb value of 2 and the number of consecutive symbols of 2 as an example. When the sending port is greater than 1, these ports use the same resource element (RE) and sequence. At this time, a cyclic shift is needed to distinguish different ports.

The cyclic shift in the sequence used by the SRS in the existing NR system is related to the maximum cyclic shift number, the total number of antenna ports, the current port number, and the comb offset value. Among them, the cyclic shift phase α _{i is} expressed as follows:

among them,

Represents the cyclic shift on the i-th port,

Is the maximum cyclic shift value of SRS, when the comb value is 2,

The value is 8; when the comb value is 4,

The value is 12.

Represents the comb offset value, the value range is

Is the total number of ports, and p _i represents the current port number.

In the prior art, the SRS of different symbols on the same port has the same cyclic shift, which causes the SRS autocorrelation sent by the terminal to be too close to the SRS cross-correlation peaks sent by other terminals, and there is interference between the terminals, which affects the delay estimation accuracy.

Summary of the invention

In order to solve the problem that SRS of different symbols on the same port has the same cyclic shift in the prior art, which causes serious interference between terminals and affects the accuracy of time delay estimation, embodiments of the present application provide a reference signal processing method, device and The system makes the SRS of different symbols on the same port have different cyclic shifts, reduces interference between terminals, and improves the accuracy of time delay estimation.

In a first aspect, an embodiment of the present application provides a reference signal processing method, including: generating a sequence of a reference signal; mapping the sequence to one or more symbols, wherein the sequences mapped to different symbols have different cycles Shift value; sending one or more symbols mapped with the reference signal to the network device.

In a second aspect, an embodiment of the present application provides a reference signal processing method, including: receiving one or more symbols, the one or more symbols are mapped with reference signals; wherein, the reference signals mapped to different symbols The sequence of has different cyclic shift values; the reference signal is measured, and the measurement result is fed back.

In a third aspect, an embodiment of the present application provides an apparatus for processing a reference signal, including: a processing unit, configured to generate a sequence of a reference signal; and map the sequence to one or more symbols, where the mapping to different symbols The sequence of symbols has different cyclic shift values; the sending unit is configured to send one or more symbols mapped with the reference signal to the network device.

In a fourth aspect, an embodiment of the present application provides an apparatus for processing a reference signal, including: a receiving unit, configured to receive one or more symbols, the one or more symbols are mapped to the reference signal; wherein, the reference signal is mapped to different The sequence of the reference signal on the symbol has different cyclic shift values; the processing unit is configured to measure the reference signal and feed back the measurement result.

With reference to any aspect of the first aspect to the fourth aspect, in an implementation manner, the cyclic shift α _i (k) of the sequence mapped to the k-th symbol satisfies:

Among them, i represents the i-th port;

Is the comb offset value, the value range is

Is the total number of ports; p _i represents the current port number;

k is the index of the symbol of the sequence mapping;

Is the maximum cyclic shift value;

Represents the cyclic shift offset of the k-th symbol.

In combination with any one of the first aspect to the fourth aspect, in another implementation manner, the

Meet the following formula:

Among them, x is the primitive element of the finite field GF(N+1),

k _start is an integer greater than or equal to 0 and less than or equal to N, where the value range of N is 6, 8, 12.

The value of the symbol index k satisfies the following correspondence:

The value of the symbol index k satisfies the following correspondence:

The value of the symbol index k satisfies the following correspondence:

The value of the symbol index k satisfies the following correspondence:

Meet the following formula:

or,

among them,

Is greater than or equal to 0, less than or equal to

Integer.

It is a random number.

In combination with any one of the first aspect to the fourth aspect, the

The value of is sent by the network device to the terminal device.

With reference to any aspect of the first to fourth aspects, the formulas, tables, or corresponding index numbers in the tables included in the above-mentioned implementation manners can be configured by the network device to the terminal device, and the terminal device determines the mapping sequence The cyclic shift value of.

In the technical solution provided by the embodiments of the present application, when the terminal maps the reference signal sequence, the cyclic shift on each symbol is different, so that the autocorrelation of the terminal sending the reference signal is staggered with the peak value of the cross-correlation of the reference signal sent by other terminals. It can effectively reduce the interference between terminals, improve the accuracy of positioning parameter estimation, and thereby improve the positioning accuracy.

Description of the drawings

Figure 1 is a schematic diagram of SRS frequency division multiplexing when the comb value in a time slot is 2;

FIG. 2 is a schematic diagram of a network structure provided by an embodiment of the present application;

FIG. 3 is a schematic diagram of another network structure provided by an embodiment of the present application;

FIG. 4 is a schematic diagram of a reference signal processing method provided by an embodiment of the present application;

FIG. 5 is a schematic diagram of a device provided by an embodiment of the present application;

Figure 6 is a schematic diagram of another device provided by an embodiment of the present application;

FIG. 7 is a schematic diagram of a terminal device provided by an embodiment of the present application;

Fig. 8 is a schematic diagram of a network device provided by an embodiment of the present application.

detailed description

The following describes the embodiments of the present application with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. A person of ordinary skill in the art knows that with the development of technology and the emergence of new scenarios, the technical solutions provided by the embodiments of the present application are equally applicable to similar technical problems.

The term "and/or" appearing in this application can be an association relationship describing associated objects, indicating that there can be three types of relationships, for example, A and/or B, which can mean: A alone exists, and A and B exist at the same time , There are three cases of B alone. In addition, the character "/" in this application generally indicates that the associated objects before and after are in an "or" relationship.

The terms "first" and "second" in the specification and claims of the application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific sequence or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments described herein can be implemented in a sequence other than the content illustrated or described herein. In addition, the terms "including" and "having" and any variations of them are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or device that includes a series of steps or modules is not necessarily limited to those clearly listed. Those steps or modules may include other steps or modules that are not clearly listed or are inherent to these processes, methods, products, or equipment. The naming or numbering of steps appearing in this application does not mean that the steps in the method flow must be executed in the time/logical sequence indicated by the naming or numbering. The named or numbered process steps can be implemented according to the The technical purpose changes the execution order, as long as the same or similar technical effects can be achieved. The division of modules presented in this application is a logical division. In actual applications, there may be other divisions. For example, multiple modules can be combined or integrated in another system, or some features can be ignored In addition, the displayed or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, and the indirect coupling or communication connection between the modules may be electrical or other similar forms. There are no restrictions in the application. In addition, the modules or sub-modules described as separate components may or may not be physically separated, may or may not be physical modules, or may be distributed to multiple circuit modules, and some or all of them may be selected according to actual needs. Module to achieve the purpose of this application program.

The technical solutions of the embodiments of this application can be applied to various communication systems, such as: long term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (time division duplex) , TDD), Universal Mobile Telecommunication System (UMTS), Worldwide Interoperability for Microwave Access (WiMAX) Communication System, Fifth Generation (5G) System or New Radio (New Radio) , NR), or next-generation communication systems.

To facilitate the understanding of the embodiments of the present application, the network architecture applicable to the embodiments of the present application is first described in detail with reference to FIG. 2 and FIG. 3.

FIG. 2 shows a schematic diagram of an architecture 200 applicable to an embodiment of the present application. As shown in Figure 2, the network architecture may specifically include the following network elements:

1. Terminal equipment: can be user equipment (UE), access terminal, user unit, user station, mobile station, mobile station, remote terminal, mobile equipment, user terminal, user agent or user device. The terminal devices involved in the embodiments of the present application may include various handheld devices with wireless communication functions, vehicle-mounted devices, wearable devices, computing devices, or other processing devices connected to a wireless modem.

Among them, Figure 1 and Figure 2 both take the terminal device as the UE as an example.

2. Network equipment: It can be equipment used to communicate with terminal equipment. The network equipment can be an evolved NodeB (eNB or eNodeB) in the LTE system, or it can be a global system for mobile communications, The base station (BTS) in the GSM) system or the code division multiple access (CDMA) system, or the base station (NodeB) in the wideband code division multiple access (WCDMA) system , NB), it can also be a wireless controller in a cloud radio access network (cloud radio access network, CRAN) scenario, or the network device can be a relay station, an access point, a vehicle-mounted device, a wearable device, and a 5G network Network equipment or network equipment in the future evolved PLMN network, etc., are not limited in the embodiment of the present application.

3. Mobility management entity (mobility management entity, MME): can be used to manage the location information, security, and business continuity of terminal equipment.

4. Location measurement unit (LMU) network element: it can be integrated in a network device, such as a base station, or it can be separated from the base station. Responsible for receiving uplink signals sent by terminal equipment. In the embodiment of this application, it is assumed that the LMU has the ability to send downlink signals.

5. Evolved serving mobile location center (evolved serving mobile location cente, E-SMLC) network element: can be used for positioning, for example, called a positioning service center or a positioning center or a positioning management device. In this embodiment of the application, the MME and LMUs are all called positioning management devices. It is used to collect the measurement information and location information reported by the base station and the terminal equipment, and it is also responsible for calculating the position of the measurement volume of the base station or the terminal equipment, and determining the location of the terminal equipment.

In this architecture, the terminal device can be connected to the radio access network via the eNodeB through the LTE-Uu interface. The E-SMLC and the LMU are connected through the SLm interface, and the E-SMLC and the MME are connected through the SLs interface.

FIG. 3 shows another schematic diagram of an architecture 300 applicable to an embodiment of the present application. As shown in the figure, the architecture 300 may specifically include the following network elements:

1. Location management function (LMF) network element: can be used for positioning, for example, it is called a location service center or a location center or a location management device. In the embodiments of the present application, they are all called a location management device. It is used to collect the measurement information and location information reported by the base station and the terminal equipment, and it is also responsible for calculating the position of the measurement volume of the base station or the terminal equipment, and determining the location of the terminal equipment. The LMF may be a device or component deployed in the core network to provide a positioning function for terminal equipment.

2. Access and mobility management function (AMF) entities: mainly used for mobility management and access management, etc., and can be used to implement mobility management entity (mobility management entity, MME) functions in addition to sessions Functions other than management, such as lawful interception, or access authorization (or authentication) functions. In the embodiment of the present application, it can be used to realize the functions of access and mobility management of network elements.

For other network elements, reference may be made to the description of the foregoing architecture 200, which is not repeated here.

In this architecture 300, the UE is connected to the radio access network (NG-RAN) via the next-generation eNodeB (ng-eNB) and gNB through the LTE-Uu and/or NR-Uu interface, respectively; Connect to the core network via AMF through the NG-C interface. Among them, the next-generation radio access network (NG-RAN) includes one or more ng-eNBs; NG-RAN may also include one or more gNBs; NG-RAN may also include one or more Ng-eNB and gNB. The ng-eNB is an LTE base station that accesses the 5G core network, and the gNB is a 5G base station that accesses the 5G core network. The core network includes functions such as AMF and LMF. The AMF and LMF are connected through the NLs interface.

The ng-eNB in Figures 2 and 3 above can also be replaced with a transmission point (TP) or a transmission and reception point (TRP).

In the embodiments of the present application, the positioning management device is mentioned many times. The positioning management device refers to a network element that can manage the serving cell and neighboring cells. The location management device can be a part of the core network or integrated into the access network device. For example, the location management device may be the LMF in the core network shown in FIG. 3, or may be the MME and LMU shown in the figure. The positioning management device may also be referred to as a positioning center. This application does not limit the name of the location management device. In the future evolution of the technology, the location management device may be given other names.

It should be understood that the above-mentioned network architecture applied to the embodiments of the present application is only an example, and the network architecture applicable to the embodiments of the present application is not limited to this. Any network architecture that can realize the functions of the above-mentioned network elements is applicable to the implementation of this application. example. For example, the embodiments of this application can be applied to other positioning systems.

It should also be understood that the aforementioned "network element" may also be referred to as an entity, equipment, device, or module, etc., which is not specifically limited in this application. In addition, in this application, in order to facilitate understanding and description, the description of "network element" is omitted in part of the description. For example, LMF network element is referred to as LMF. In this case, the "LMF" should be understood as LMF network element. Or the LMF entity, hereinafter, the description of the same or similar situations will be omitted.

It should also be understood that the name of the interface between the various network elements described above is only an example, and the name of the interface in a specific implementation may be other names, which is not specifically limited in this application. In addition, the name of the message (or signaling) transmitted between the above-mentioned various network elements is only an example, and does not constitute any limitation on the function of the message itself.

It should also be understood that the above-mentioned naming is only convenient for distinguishing different functions, and should not constitute any limitation to this application, and this application does not exclude the possibility of using other naming in 5G networks and other networks in the future. For example, in a 6G network, some or all of the above-mentioned network elements may use the terminology in 5G, or may adopt other names. Here is a unified description, and will not be repeated here.

As shown in FIG. 4, an embodiment of the present application provides a reference signal processing method 400, including:

Step 410: The terminal device generates a sequence of reference signals;

Step 420: Map the sequence to one or more symbols, where the sequences mapped to different symbols have different cyclic shift values;

Step 430: Send one or more symbols mapped with the reference signal to the network device.

Step 440: The network device receives one or more symbols, the one or more symbols are mapped with reference signals, wherein the sequences mapped to different symbols have different cyclic shift values;

Step 450: Measure the reference signal to obtain a measurement result.

_{Specifically, in the step 420, the cyclic shift α i} (k) for mapping the sequence to the k-th symbol by the terminal device satisfies:

Among them, i represents the i-th port;

Indicates the maximum cyclic displacement value, which is related to the comb value. In the current standard, when the value of comb is 2,

The value is 8; when the comb value is 4,

The value is 12; when the comb value is 8,

The value has not yet been determined. For example, when the value of comb is 8,

The value can be 6 or 12, or other values.

Is the comb offset value, the value range is

Is the total number of ports; p _i represents the current port number;

Represents the cyclic shift offset of the k-th symbol mapped by the reference signal.

The above formula can be sent by the network device to the terminal device, or can be pre-stored by the terminal device.

In one possible implementation,

It is a random number, for example, 4,2,0,5,7,1,3,8,2,9,6.

The random number may be sent by the network device to the terminal device, or may be pre-stored by the terminal device.

By introducing a random variable into the cyclic shift generation formula α _i (k), when the terminal is mapping the sequence of the reference signal, the sequence mapped to different symbols has different cyclic shift values, so that the terminal is automatically sending the reference signal. The correlation and the peak value of the cross-correlation of the reference signal sent by other terminals are staggered, which can effectively reduce the interference between terminals, improve the accuracy of positioning parameter estimation, and thereby improve the positioning accuracy.

In another possible implementation,

The value of is configured by the network equipment through signaling, and the configured value can also be a set of random numbers or multiple different values. For example, network equipment is configured through DCI or RRC signaling

The value of is 5,2,1,4,6,0. This method can also enable the terminal to have different cyclic shift values for the sequences mapped to different symbols when mapping the sequence of the reference signal, so that the autocorrelation of the reference signal sent by the terminal is staggered from the cross-correlation peak of the reference signal sent by other terminals. It can effectively reduce the interference between terminals, improve the accuracy of positioning parameter estimation, and thereby improve the positioning accuracy.

In another possible implementation, it can also be obtained by formula

The value of, for example, the

Meet the following formula:

or,

Among them, x is the primitive element of the finite field GF(N+1). Depending on the value of N+1, the value of x may also be different. In this embodiment,

It can be seen that the value of x is related to N, and the terminal can directly obtain the cyclic shift value on each symbol according to the above formula.

Optionally, the above two formulas may be sent by the network device to the terminal device, or may be pre-stored by the terminal device.

Among them, the above second formula

Introduced in

And k _start , refer to the offset of the cyclic shift on each symbol based on the reference shift value (or referred to as the reference shift value). The reference shift value refers to

And the cyclic shift value when _{k start is 0.} Among them, k _start represents the symbol from which to start offset,

Indicates how much the cyclic shift of each symbol is offset from the reference shift value.

_{The value range of k start} and k start can be any integer in [0,N].

Exemplarily, to

k _start = 0 as an example, through the above formula, it can be concluded that when the reference sequence is mapped to the first symbol (k=0), the cyclic shift offset is 0, and when mapped to the second symbol (k=1) When the cyclic shift offset is 2, when it is mapped to the third symbol (k=2), the cyclic shift offset is 1; when it is mapped to the fourth symbol (k=3), the cyclic shift The bit offset is 5; when mapped to the fifth symbol (k=4), the cyclic shift offset is 3; when mapped to the sixth symbol (k=5), the cyclic shift offset is Is 4; when mapped to the seventh symbol (k=6), the cyclic shift offset is 0; when mapped to the eighth symbol (k=7), the cyclic shift offset is 2; when When mapped to the ninth symbol (k=8), the cyclic shift offset is 1; when mapped to the tenth symbol (k=9), the cyclic shift offset is 5; when mapped to the tenth symbol (k=9), the cyclic shift offset is 5; For one symbol (k=10), the cyclic shift offset is 3, when mapped to the twelfth symbol (k=11), the cyclic shift offset is 4; when mapped to the thirteenth symbol When the symbol (k=12), the cyclic shift offset is 0; when the fourteenth symbol (k=13) is mapped, the cyclic shift offset is 2.

Optionally, the cyclic shift value of each symbol can be obtained by the above formula. It can also be obtained by looking up a table. For example, the table can be sent to the terminal by the network device, or the table can be pre-stored by the terminal. The table records the reference signal mapping symbols and

Correspondence information of values:

when

x is 3,

When k _start = 0, as shown in Table 1 below:

Table 1:

When the maximum is 6, the cyclic shift offset of each symbol

It should be understood that Table 1 is only an example, and the table stored in the terminal may be the same as recorded in Table 1, or it may only contain the first column and the third column, and may also include other columns on the basis of the first column and the third column. Column, this application is not limited.

Due to the characteristics of the finite field, the finite field must be a prime number in order to find the primitive element in the field. The feature of the primitive element is that the power of the number in the finite field can traverse all the numbers in the finite field. For example, in the above example, the finite field is taken as GF(7), and 3 is its primitive element. It can be seen that 3 ^k mod 7, when the value of k changes from 0 to 6, the value of the output value is also Includes all values from 1 to 6, so this feature can be used to make the generated output value between 0 and

Random traversal between. Those skilled in the art should understand that the above primitive element of 3 is only an example, and it can also be other numbers that satisfy a finite field, which is not limited in this application.

Optionally, Table 1 lists the offset of the cyclic shift when the number of symbols is at most 14. According to the current NR standard, the maximum number of symbols in a slot is 14, and the number of symbols mapped by SRS can be {1,2,4,8,12}. If the symbol length is K and the initial

When it is 0, then take the first K values in Table 1 as the offset of the cyclic shift. For example, the symbol length is 4, and the 14

values

0, 2, 1, and 5 in the table are taken as the cyclic shift offset of the four symbols of the mapping SRS. If k _{start is} _{not 0, then K values starting from k start} from Table 1 are taken as the offset of the cyclic shift. For example, when K = 4 and k _start = 5, then the 5th to 8th output {3, 4, 0, 2} in Table 1 is taken as the cyclic shift offset on each symbol. in case

When, then the 5th to 8th output {3,4,0,2} are added by 2 to become {5,6,2,4} as the cyclic shift offset of each symbol.

In another example, when

When k _start = 0, as shown in Table 2 below:

Table 2:

When it is 8, the cyclic shift offset of each symbol

Another example, the two values of 2 and 5 do not appear in the offset in Table 2. If you have to traverse all 8 offsets, you can choose the first 6 values to be consistent with Table 2, and then the next two values Supplement 5 and 2, and then repeat the traversal of the following values, as shown in Table 3:

table 3

Cyclic shift offset per symbol when it is 8

It can be seen from Table 3 that the disadvantage in this case is that the cyclic shift offset recorded in Table 3 does not conform to the previously used formula. However, when the reference signal is mapped to the sequence, the sequences mapped to different symbols have different cyclic shift values, so that the autocorrelation of the terminal when the reference signal is sent is staggered with the peak value of the cross-correlation of the reference signal sent by other terminals, which can effectively reduce the terminal The interference between the two can improve the accuracy of positioning parameter estimation, thereby improving the positioning accuracy.

Another example, when

Time,

When k _start = 0, as shown in the following table:

Table 4:

The cyclic shift offset of each symbol at 12

due to

When it is 12, the finite field is 13, which itself is a prime number, and 2 is its primitive element. It can traverse all the values in the finite field. Therefore, the cyclic offset of each symbol can be obtained based on the formula or Table 4.

The foregoing embodiment considers the offset of the cyclic shift from the perspective of the maximum cyclic shift. However, when the number of symbols mapped by the reference signal is small, the arrangement according to the above scheme may cause the maximum cyclic offset to be underutilized. For example, when the number of symbols mapped by the reference signal is 2, the maximum cyclic shift When it is 12, if the situation in Table 4 is used, then the offsets of the two symbols are 0 and 1, respectively, which does not fully distinguish the maximum offset of 12. Therefore, based on this situation, consider the number of symbols when the reference signal is mapped In a smaller case, for example, when the number of mapped symbols is 2 and 4, other implementation methods can be used to obtain the symbol-level cyclic shift offset.

In one implementation,

The value satisfies the following formula:

or,

In another implementation manner, a table lookup method can also be used. For example, Table 5 is sent to the terminal by the network device, or the terminal stores Table 5 in advance, and Table 5 is as follows:

Table 5: When the reference signal is mapped to 2 symbols, the cyclic shift offset of each symbol

It should be understood that Table 5 is only an example, and the table actually stored in the terminal may also include other columns, which are not limited in this application.

The second formula above introduces

It is to introduce the offset, which represents the offset of each symbol on the cyclic shift value calculated based on the formula, and the value range is

Such as when

Is 8,

When the value is 5, add 5 to the above {0,4} to get the cyclic shift value of the two symbols {5,1}.

When the number of symbols mapped by the reference signal is 4, we will discuss in two cases,

When the value is 8, 12, both can be divisible by 4, and you can use and

The same formula with a value of 4.

Illustratively,

When the value is 8, 12, we continue to use the above formula at this time:

or,

The cyclic shift offset on each symbol can also be obtained based on the look-up table, for example, Table 6:

Table 6: When the reference signal is mapped with 4 symbols,

The value is 8, the cyclic shift offset at 12

It can be seen from the above expression that, compared to the cyclic shift offsets corresponding to the first 4 symbols in Table 2, Table 3 and Table 4, the cyclic shift difference between two adjacent symbols in Table 6 is larger. . when

When it is 8, the cyclic shift offset between each two of the 4 symbols is a difference of 2, when

When it is 12, the cyclic shift offset between every two of the 4 symbols is a difference of 3.

When the number of symbols mapped by the reference signal is 4,

When, the following formula can be used:

or,

or

In the above formula

Represents the offset.

Optionally, it can also be obtained by looking up a table, for example, Table 7:

Table 7: When the reference signal is mapped with 4 symbols,

Cyclic shift offset

Since 6 is not divisible by 4, there is no guarantee that each symbol will reach the same offset, so there may be two offsets, such as {0,1,3,4}, the first and second symbols The difference is 1, and the difference is 2 between the third and fourth symbols. At {0,2,3,5}, there is a difference of 2 between the first and second symbols, and a difference of 1 between the third and fourth symbols.

In the above third implementation manner, by increasing the symbol-level cyclic shift offset, the cyclic shift on each symbol is different, which can effectively reduce the interference between terminals and improve the accuracy of positioning parameter estimation. In turn, the positioning accuracy is improved.

The various embodiments described herein may be independent solutions, or may be combined according to internal logic, and these solutions fall within the protection scope of the present application.

It can be understood that, in each of the foregoing method embodiments, the execution subject of processing the reference signal may be either a terminal device or a component (for example, a chip or a circuit) that can be used in a terminal device.

The method embodiments provided in the embodiments of the present application are described above, and the device embodiments provided in the embodiments of the present application will be described below. It should be understood that the description of the device embodiment and the description of the method embodiment correspond to each other. Therefore, for the content that is not described in detail, please refer to the above method embodiment. For the sake of brevity, it will not be repeated here.

FIG. 5 shows a schematic block diagram of a reference signal processing apparatus 500 according to an embodiment of the present application. The device 500 includes the following units.

A generating unit 510, configured to generate a reference signal sequence; map the sequence to one or more symbols, wherein the sequences mapped to different symbols have different cyclic shift values;

The sending unit 520 is configured to send one or more symbols mapped with the reference signal to a network device.

Correspondingly, an embodiment of the present application also provides a schematic diagram of a reference signal processing apparatus 600, and the apparatus 600 includes the following units.

The receiving unit 610 is configured to receive one or more symbols, the one or more symbols are mapped with reference signals, wherein the sequences mapped to different symbols have different cyclic shift values;

The processing unit 620 is configured to measure the reference signal to obtain a measurement result.

_{Specifically, the cyclic shift α i} (k) of the sequence mapped to the k-th symbol satisfies:

Among them, i represents the i-th port;

Represents the maximum cyclic displacement value and is related to the comb value. In the current standard, when the value of comb is 2,

The value is 8; when the comb value is 4,

The value is 12; when the comb value is 8,

The value can be 6 or 12, or other values.

Is the comb offset value, the value range is

Is the total number of ports; p _i represents the current port number;

The above formula may be sent to the terminal by the network device, or the above formula may be pre-stored by the terminal.

In one possible implementation,

It is a random number, for example, 4,2,0,5,7,1,3,8,2,9,6. The random number may be sent to the terminal by the network device, or the random number may be pre-stored by the terminal.

By introducing a random variable into the cyclic shift generation formula α _i (k), when the terminal is mapping the sequence of the reference signal, the sequence mapped to different symbols has different cyclic shift values, so that the terminal is automatically sending the reference signal. The correlation and the peak value of the cross-correlation of the reference signals sent by other terminals are staggered, which can effectively reduce the interference between the terminals, improve the accuracy of positioning parameter estimation, and thereby improve the positioning accuracy.

In another possible implementation,

The value of is 5,2,1,4,6,0. This method can also enable the terminal to have different cyclic shift values for the sequences mapped to different symbols when mapping the sequence of the reference signal, so that the autocorrelation of the reference signal sent by the terminal is staggered from the cross-correlation peak of the reference signal sent by other terminals. It can effectively reduce the interference between terminals, improve the accuracy of positioning parameter estimation, and further improve the positioning accuracy.

In another possible implementation, it can also be obtained by formula

The value of, the formula can be sent to the terminal by the network device, or pre-stored by the terminal. For example, the

Meet the following formula:

or,

The second above

Introduced in the formula

And the cyclic shift value when _{k start is 0.} Among them, k _start represents the symbol from which to start the offset,

_{The value range of k start} and k start can be any integer in [0,N].

Exemplarily, to

Optionally, the cyclic shift offset of each symbol can be obtained by the above formula. It can also be obtained by looking up a table. For example, the table can be sent to the terminal by the network device, or the table can be pre-stored by the terminal. The table records the reference signal mapping symbols and

Correspondence information of values:

when

x is 3,

When k _start = 0, as shown in Table 1 below:

Table 1:

When the maximum is 6, the cyclic shift offset of each symbol

Due to the characteristics of the finite field, the finite field must be a prime number in order to find the primitive element in the field. The feature of the primitive element is that the power of the number in the finite field can traverse all the numbers in the finite field. For example, in the above example, the finite field is taken as GF(7), and 3 is its primitive element. It can be seen that 3 ^k mod 7, when the value of k changes from 0 to 6, the value of the output value is also Including all the values from 1 to 6, this feature makes the generated output value from 0 to

Optionally, Table 1 lists the offset of the cyclic shift when the number of symbols is at most 14. According to the current NR standard, the maximum number of symbols in a slot is 14, and the number of symbols mapped by SRS can be 1, 2, 4, 8, or 12. If the symbol length is K and the initial

When it is 0, then take the first K values in the table as the offset of the cyclic shift. For example, the symbol length is 4, and the 4

values

0, 2, 1, and 5 in Table 1 are taken as the cyclic shift offset of the four symbols of the mapping SRS. If k _{start is} _{not 0, then K values starting from k start} from Table 1 are taken as the offset of the cyclic shift. For example, when K=4 and k _start =5, then take the 5th to 8th output {3,4,0,2} in Table 1 as the cyclic shift offset on each symbol. in case

In another example, when

When k _start = 0, as shown in Table 2 below:

Table 2:

When it is 8, the cyclic shift offset of each symbol

As another example, the two values of 2 and 5 do not appear in the cyclic shift offset in Table 2. If you have to traverse all 8 offsets, you can choose the first 6 values to be consistent with Table 2, and then the following Add 5 and 2 to the two values, and then repeat the traversal of the following values, as shown in Table 3:

table 3

Cyclic shift offset per symbol when it is 8

It can be seen from Table 3 that the disadvantage in this case is that the cyclic shift offset recorded in Table 3 does not conform to the previously used formula. However, it is still possible to make the sequences mapped to different symbols have different cyclic shift offsets when the reference signal is mapped to the sequence, so that the autocorrelation of the terminal when the reference signal is sent is staggered with the peak of the cross-correlation of the reference signal sent by other terminals, which can effectively Reduce interference between terminals, improve the accuracy of positioning parameter estimation, and thereby improve positioning accuracy.

Another example, when

Time,

When k _start = 0, as shown in the following table:

Table 4:

The cyclic shift offset of each symbol at 12

due to

The foregoing embodiment considers the offset of the cyclic shift from the perspective of the maximum cyclic shift. But when the number of symbols mapped by the reference signal is small, the arrangement according to the above scheme may cause the maximum cyclic offset to be underutilized, such as when the number of symbols is 2 and the maximum cyclic shift is 12. If the situation in Table 4 is used, then the offsets of the two symbols are 0 and 1, which does not fully distinguish the maximum offset of 12. Therefore, based on this situation, consider the case where the number of symbols is small, such as the reference signal mapping When the number of symbols is small, for example, when the number of mapped symbols is 2 and 4, other implementation methods can be used to obtain the symbol-level cyclic shift value.

In one implementation,

The value satisfies the following formula:

or,

Another way of implementation can also be a table lookup. For example, the terminal stores Table 5, and Table 5 is as follows:

The second formula above introduces

It is the introduction of offset, which represents the offset of each symbol on the cyclic shift value calculated based on the formula, and its value range is

For example, when the maximum CS is 8,

When the value is 5, add 5 to the above {0,4}, and the cyclic shift offset on the two symbols is {5,1}.

, All can be divisible by 4, you can use and

The same formula. Illustratively,

At this time, we continue to use the above formula:

or,

Table 6: When the reference signal is mapped with 4 symbols,

Cyclic shift offset

When it is 8, the cyclic shift value between each two of the 4 symbols is a difference of 2, when

When it is 12, the cyclic shift value between every two of the 4 symbols is a difference of 3.

When the number of symbols mapped by the reference signal is 4,

When, the following formula can be used:

or,

or

In the above formula

Represents the offset.

Table 7: When the reference signal is mapped with 4 symbols,

Cyclic shift offset

The above-exemplified centralized method allows the terminal to map the sequence of the reference signal, and the sequence mapped to different symbols has different cyclic shift values, so that the autocorrelation of the terminal sending the reference signal and the peak value of the cross-correlation of the reference signal sent by other terminals Staggering can effectively reduce interference between terminals, improve the accuracy of positioning parameter estimation, and thereby improve positioning accuracy. The embodiment of the present application also provides a communication device 700. The communication device 700 may be a terminal device or a chip. The communication device 700 may be used to execute the foregoing method embodiments.

When the communication device 700 is a terminal device, FIG. 7 shows a simplified schematic diagram of the structure of the terminal device. It is easy to understand and easy to illustrate. In Fig. 7, the terminal device uses a mobile phone as an example. As shown in Figure 7, the terminal equipment includes a processor, a memory, a radio frequency circuit, an antenna, and an input and output device. The processor is mainly used to process the communication protocol and communication data, and to control the terminal device, execute the software program, and process the data of the software program. The memory is mainly used to store software programs and data. The radio frequency circuit is mainly used for the conversion of baseband signal and radio frequency signal and the processing of radio frequency signal. The antenna is mainly used to send and receive radio frequency signals in the form of electromagnetic waves. Input and output devices, such as touch screens, display screens, keyboards, etc., are mainly used to receive data input by users and output data to users. It should be noted that some types of terminal equipment may not have input and output devices.

When data needs to be sent, the processor performs baseband processing on the data to be sent, and then outputs the baseband signal to the radio frequency circuit. The radio frequency circuit performs radio frequency processing on the baseband signal and sends the radio frequency signal to the outside in the form of electromagnetic waves through the antenna. When data is sent to the terminal device, the radio frequency circuit receives the radio frequency signal through the antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor, and the processor converts the baseband signal into data and processes the data. For ease of description, only one memory and processor are shown in FIG. 7. In an actual terminal device product, there may be one or more processors and one or more memories. The memory may also be referred to as a storage medium or storage device. The memory may be set independently of the processor, or may be integrated with the processor, which is not limited in the embodiment of the present application.

In the embodiments of the present application, the antenna and radio frequency circuit with the transceiving function can be regarded as the transceiving unit of the terminal device, and the processor with the processing function can be regarded as the processing unit of the terminal device.

As shown in FIG. 7, the terminal device includes a transceiving unit 710 and a processing unit 720. The transceiving unit 710 may also be referred to as a transceiver, a transceiver, a transceiving device, and so on. The processing unit 720 may also be referred to as a processor, a processing board, a processing module, a processing device, and so on. Optionally, the device for implementing the receiving function in the transceiving unit 710 can be regarded as the receiving unit, and the device for implementing the sending function in the transceiving unit 710 can be regarded as the sending unit, that is, the transceiving unit 710 includes a receiving unit and a sending unit. The transceiver unit may sometimes be called a transceiver, a transceiver, or a transceiver circuit. The receiving unit may sometimes be called a receiver, a receiver, or a receiving circuit. The transmitting unit may sometimes be called a transmitter, a transmitter, or a transmitting circuit.

For example, in an implementation manner, the processing unit 720 is configured to execute the foregoing method embodiment. The transceiving unit 710 is used for related transceiving operations in the foregoing method embodiments. For example, the transceiver unit 710 is used to send one or more symbols.

It should be understood that FIG. 7 is only an example and not a limitation, and the foregoing terminal device including a transceiver unit and a processing unit may not rely on the structure shown in FIG. 7.

When the communication device 700 is a chip, the chip includes a transceiver unit and a processing unit. The transceiver unit may be an input/output circuit or a communication interface; the processing unit may be a processor, microprocessor, or integrated circuit integrated on the chip.

The embodiment of the present application also provides a communication device 800, and the communication device 800 may be a network device or a chip. The communication device 800 may be used to execute the foregoing method embodiments.

When the communication device 800 is a network device, for example, it is a base station. Figure 8 shows a simplified schematic diagram of the base station structure. The base station includes part 810 and part 820. The 810 part is mainly used for the transmission and reception of radio frequency signals and the conversion between radio frequency signals and baseband signals; the 820 part is mainly used for baseband processing and control of base stations. The 810 part can generally be called a transceiver unit, transceiver, transceiver circuit, or transceiver. The 820 part is usually the control center of the base station, and may generally be referred to as a processing unit, which is used to control the base station to perform the processing operations on the network device side in the foregoing method embodiments.

The transceiver unit of part 810 may also be called a transceiver or a transceiver, etc., which includes an antenna and a radio frequency unit, and the radio frequency unit is mainly used for radio frequency processing. Optionally, the device for implementing the receiving function in part 810 can be regarded as the receiving unit, and the device for implementing the sending function as the sending unit, that is, the part 810 includes the receiving unit and the sending unit. The receiving unit may also be called a receiver, a receiver, or a receiving circuit, etc., and the sending unit may be called a transmitter, a transmitter, or a transmitting circuit, etc.

The 820 part may include one or more single boards, and each single board may include one or more processors and one or more memories. The processor is used to read and execute programs in the memory to implement baseband processing functions and control the base station. If there are multiple boards, each board can be interconnected to enhance processing capabilities. As an optional implementation, multiple single boards may share one or more processors, or multiple single boards may share one or more memories, or multiple single boards may share one or more processing at the same time. Device.

For example, in an implementation manner, part 820 is used to execute the foregoing method embodiment. The 810 part is used for the related transceiving operations in the above method embodiment. For example, part 810 is used to receive one or more symbols.

It should be understood that FIG. 8 is only an example and not a limitation, and the foregoing network device including a transceiver unit and a processing unit may not rely on the structure shown in FIG. 8.

When the communication device 800 is a chip, the chip includes a transceiver unit and a processing unit. Wherein, the transceiver unit may be an input/output circuit or a communication interface; the processing unit is a processor, microprocessor, or integrated circuit integrated on the chip.

The embodiments of the present application also provide a computer-readable storage medium on which a computer program is stored, and when the computer program is executed by a computer, the computer realizes the foregoing method embodiments.

The embodiments of the present application also provide a computer program product containing instructions, which when executed by a computer causes the computer to implement the foregoing method embodiments.

For explanations and beneficial effects of related content in any of the communication devices provided above, reference may be made to the corresponding method embodiments provided above, which will not be repeated here.

In the embodiment of the present application, the terminal device or the network device includes a hardware layer, an operating system layer running on the hardware layer, and an application layer running on the operating system layer. The hardware layer includes hardware such as a central processing unit (CPU), a memory management unit (MMU), and memory (also referred to as main memory). The operating system may be any one or more computer operating systems that implement business processing through processes, for example, Linux operating systems, Unix operating systems, Android operating systems, iOS operating systems, or windows operating systems. The application layer includes applications such as browsers, address books, word processing software, and instant messaging software. Moreover, the embodiments of the application do not specifically limit the specific structure of the execution body of the method provided in the embodiments of the application, as long as the program that records the codes of the methods provided in the embodiments of the application can be provided in accordance with the embodiments of the application. For example, the execution subject of the method provided in the embodiments of the present application may be a terminal device or a network device, or a functional module in the terminal device or the network device that can call and execute the program.

In addition, various aspects or features of the present application can be implemented as methods, devices, or products using standard programming and/or engineering techniques. The term "article of manufacture" used in this application encompasses a computer program accessible from any computer-readable device, carrier, or medium. For example, computer-readable media may include, but are not limited to: magnetic storage devices (for example, hard disks, floppy disks or tapes, etc.), optical disks (for example, compact discs (CD), digital versatile discs (DVD)) Etc.), smart cards and flash memory devices (for example, erasable programmable read-only memory (EPROM), cards, sticks or key drives, etc.). In addition, various storage media described herein may represent one or more devices and/or other machine-readable media for storing information. The term "machine-readable medium" may include, but is not limited to, wireless channels and various other media capable of storing, containing, and/or carrying instructions and/or data.

It should be understood that the processor mentioned in the embodiment of this application may be a central processing unit (Central Processing Unit, CPU), or other general-purpose processors, digital signal processors (Digital Signal Processors, DSPs), and application-specific integrated circuits (Central Processing Unit, CPU). Application Specific Integrated Circuit (ASIC), Field Programmable Gate Array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor or the like.

It should also be understood that the memory mentioned in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory. Among them, the non-volatile memory can be read-only memory (Read-Only Memory, ROM), programmable read-only memory (Programmable ROM, PROM), erasable programmable read-only memory (Erasable PROM, EPROM), and electrically available Erase programmable read-only memory (Electrically EPROM, EEPROM) or flash memory. The volatile memory may be random access memory (Random Access Memory, RAM), which is used as an external cache. By way of exemplary but not restrictive description, many forms of RAM are available, such as static random access memory (Static RAM, SRAM), dynamic random access memory (Dynamic RAM, DRAM), synchronous dynamic random access memory (Synchronous DRAM, SDRAM), Double Data Rate Synchronous Dynamic Random Access Memory (Double Data Rate SDRAM, DDR SDRAM), Enhanced Synchronous Dynamic Random Access Memory (Enhanced SDRAM, ESDRAM), Synchronous Link Dynamic Random Access Memory (Synchlink DRAM, SLDRAM) ) And Direct Rambus RAM (DR RAM).

It should be noted that when the processor is a general-purpose processor, DSP, ASIC, FPGA or other programmable logic device, discrete gate or transistor logic device, or discrete hardware component, the memory (storage module) is integrated in the processor.

It should be noted that the memories described herein are intended to include, but are not limited to, these and any other suitable types of memories.

A person of ordinary skill in the art may realize that the units and algorithm steps of the examples described in combination with the embodiments disclosed herein can be implemented by electronic hardware or a combination of computer software and electronic hardware. Whether these functions are performed by hardware or software depends on the specific application and design constraint conditions of the technical solution. Professionals and technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered beyond the scope of this application.

Those skilled in the art can clearly understand that, for the convenience and conciseness of description, the specific working process of the system, device and unit described above can refer to the corresponding process in the foregoing method embodiment, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed system, device, and method may be implemented in other ways. For example, the device embodiments described above are merely illustrative, for example, the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components may be combined or It can be integrated into another system, or some features can be ignored or not implemented. In addition, the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.

In addition, the functional units in the various embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit.

If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer readable storage medium. Based on this understanding, the technical solution of the present application essentially or the part that contributes to the existing technology or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage media include: U disk, mobile hard disk, read-only memory (read-only memory, ROM), random access memory (random access memory, RAM), magnetic disks or optical disks and other media that can store program codes. .

The above are only specific implementations of this application, but the protection scope of this application is not limited to this. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed in this application. Should be covered within the scope of protection of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

A method for reference signal processing, characterized in that it comprises:

Generate a sequence of reference signals;

Mapping the sequence to one or more symbols, wherein the sequences mapped to different symbols have different cyclic shift values;

Sending one or more symbols mapped with the reference signal to the network device.
The method according to claim 1, wherein the cyclic shift α i (k) of the sequence mapped to the k-th symbol satisfies:

Among them, i represents the i-th port;

Is the comb offset value, the value range is

Is the total number of ports; p i represents the current port number;

k is the index of the symbol of the sequence mapping;

Is the maximum cyclic shift value;

Represents the cyclic shift offset of the k-th symbol.
The method of claim 2, wherein the
Meet the following formula:

Among them, x is the primitive element of the finite field GF(N+1),
k start is an integer greater than or equal to 0 and less than or equal to N.
The method of claim 2, wherein the
The value of the symbol index k satisfies the following correspondence:
The method of claim 2, wherein the
The value of the symbol index k satisfies the following correspondence:
The method of claim 2, wherein the
The value of the symbol index k satisfies the following correspondence:
The method of claim 2, wherein the
The value of the symbol index k satisfies the following correspondence:
The method of claim 2, wherein the
Meet the following formula:

or,

or,

among them,
Is greater than or equal to 0, less than or equal to
Integer.
The method of claim 2, wherein the
It is a random number.
The method of claim 2, wherein the
The value of is received from the network device.
A method for reference signal processing, characterized in that it comprises:

Receiving one or more symbols, the one or more symbols being mapped with a reference signal;

Wherein, the sequences of the reference signals mapped to different symbols have different cyclic shift values;

The reference signal is measured, and the measurement result is fed back.
The method according to claim 11, wherein the cyclic shift α i (k) of the sequence mapped to the k-th symbol satisfies:

Wherein, i is the index of the port that sends the reference signal, and p i is the port number;

k is the index of the symbol of the sequence mapping;

Is the maximum cyclic shift value;

Represents the cyclic shift offset of the k-th symbol;
The method of claim 12, wherein the
Meet the following formula:

among them,
The method of claim 12, wherein the
The value of the symbol index k satisfies the following correspondence:
The method of claim 12, wherein the
The value of the symbol index k satisfies the following correspondence:
The method of claim 12, wherein the
The value of the symbol index k satisfies the following correspondence:
The method of claim 12, wherein the
The value of the symbol index k satisfies the following correspondence:
The method of claim 12, wherein the
Meet the following formula:

or,

or,

among them,
Is greater than or equal to 0, less than or equal to
Integer.
The method of claim 12, wherein the
It is a random number.
The method of claim 12, wherein the
The value of is sent by the network device to the terminal device.
A device for processing a reference signal, characterized in that it comprises:

A processing unit for generating a sequence of reference signals; mapping the sequence to one or more symbols, wherein the sequences mapped to different symbols have different cyclic shift values; and,

The sending unit is configured to send one or more symbols mapped with the reference signal to the network device.
A device for processing a reference signal, characterized in that it comprises:

The receiving unit is configured to receive one or more symbols, the one or more symbols are mapped with reference signals; wherein the sequences of the reference signals mapped to different symbols have different cyclic shift values; and,

The processing unit is used to measure the reference signal and feed back the measurement result.
The apparatus according to claim 21 or 22, wherein the cyclic shift α i (k) of the sequence mapped to the k-th symbol satisfies:

Among them, i represents the i-th port;

Is the comb offset value, the value range is

Is the total number of ports; p i represents the current port number;

k is the index of the symbol of the sequence mapping;

Is the maximum cyclic shift value;

Represents the cyclic shift offset value of the k-th symbol.
The device according to claim 23, wherein said
Meet the following formula:

Among them, x is the primitive element of the finite field GF(N+1),
k start is greater than or equal to 0 and less than or equal to N.
The device according to claim 23, wherein said
The value of the symbol index k satisfies the following correspondence:
The device according to claim 23, wherein said
The value of the symbol index k satisfies the following correspondence:
The device according to claim 23, wherein said
The value of the symbol index k satisfies the following correspondence:
The device according to claim 23, wherein said
The value of the symbol index k satisfies the following correspondence:
The device according to claim 23, wherein said
Meet the following formula:

or,

or,

or,

among them,
Is greater than or equal to 0, less than or equal to
The device according to claim 23, wherein said
It is a random number.
The device according to claim 23, wherein said
The value of is received from the network device.
A computer-readable storage medium storing computer instructions. When the instructions are executed, the computer is caused to execute the method according to any one of claims 1-10, or the computer is caused to execute any one of claims 11-20 The method described in the item.