CN110912660B - Method and device for generating reference signal - Google Patents

Abstract

The embodiment of the invention provides a method and a device for generating a reference signal sequence, which can improve the oversized reference signal sequence space. The method comprises the following steps: determining the order number m of a binary symmetric matrix for generating a second-order Reed-Muller sequence; determining a binary symmetric matrix P of m orders and a binary vector b of m x 1; generating a second-order Reed-Muller sequence according to the determined binary symmetric matrix P, the binary vector b and a second-order Reed-Muller sequence generating formula; and expanding or truncating the second-order Reed-Muller sequence into a reference signal sequence with the length L.

Description

Method and apparatus for generating a reference signal

technical field

The present application relates to the field of communications, and more particularly, to a method and apparatus for generating a reference signal sequence.

Background technique

In a typical wireless communication network (for example, Long Term Evolution (LTE) for short), the selection of uplink data shared channels (Shared Data Channels) is based on the scheduling/granting mechanism, which is completely affected by the base station ( Base Station, referred to as "BS") control. In this mechanism, user equipment (UserEquipment, referred to as "UE") first sends an uplink scheduling request to the BS. When the BS receives the request, it sends an uplink Grant to the UE to notify The UE is the uplink transmission resource allocated to the UE, according to which the UE performs data transmission on the permitted uplink transmission resources.

Large-scale user access is one of the typical application scenarios of next-generation communication networks. For 5G massive connection scenarios, the number of potential access user equipment is huge and the number of actually active user equipment changes dynamically. The access method must have the characteristics of high capacity, low latency, and low cost. Allocating uplink resources for each user equipment by the base station will bring huge signaling overhead. The 5G design of a grant-free access system will be an inevitable choice in the future, which is of great practical significance. In the authorization-free access system, before sending data, the user equipment does not need to obtain dynamic authorization from the base station for this data transmission, but directly uses preconfigured resources and transmission parameters to send uplink data. For uplink communication, the network device needs a demodulation reference signal (DMRS, demodulation reference signal) or a preamble (Preamble) configured for different user equipments. The base station identifies the user equipment and performs channel estimation by receiving the reference signal of the user equipment. A bottleneck problem of Grant Free access is the number of reference signals (DMRS or Preamble). In the prior art, the number of reference signals is very limited. Due to too many user equipments, the insufficient number of available reference signals will be the bottleneck of the network capacity.

SUMMARY OF THE INVENTION

The present application provides a method and apparatus for generating a reference signal sequence, which can increase the super-large reference signal sequence space, thereby increasing the network capacity.

In a first aspect, the present application provides a method for generating a reference signal sequence, including:

Determine the order m of the binary symmetric matrix used to generate the second-order Reed-Muller sequence;

Determine a binary symmetric matrix P of order m and a binary vector b of m*1;

Generate a second-order Reed-Muller sequence according to the determined binary symmetric matrix P, the binary vector b and the second-order Reed-Muller sequence generation formula;

The second-order Reed-Muller sequence is extended or truncated into a reference signal sequence of length L.

In a second aspect, the present application provides an apparatus for generating a reference signal sequence, including:

The first determination module is used to determine the order m of the binary symmetric matrix for generating the second-order Reed-Muller sequence;

The second determination module is used to determine an m-order binary symmetric matrix P and an m*1 binary vector b;

The Reed-Muller sequence generation module is used to generate a second-order Reed-Muller sequence according to the determined binary symmetric matrix P, the binary vector b and the second-order Reed-Muller sequence generation formula;

A reference signal sequence generation module, configured to expand or truncate the second-order Reed-Muller sequence into a reference signal sequence of length L.

In a third aspect, the present application provides an apparatus for generating a reference signal sequence, the apparatus comprising a processor and a transceiver, characterized in that the processor is configured to support the apparatus to perform the method of the first aspect, the The transceiver is specifically configured to transmit the generated reference signal sequence.

In a fourth aspect, the present application provides a computer-readable storage medium, where computer program codes are stored in the computer-readable storage medium, and when the computer program codes are executed by a processing unit or a processor, the processing unit or the The device where the processor is located executes the method described in the first aspect.

In a fifth aspect, a communication chip has instructions stored therein which, when run on a communication device, cause the communication device to perform the method of the first aspect.

A sixth aspect, a computer program product, the computer program product comprising: computer program code, when the computer program code is executed by a communication unit or a transceiver and a processing unit or a processor of a communication device, the terminal device executes the claims The method described in the first aspect.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some of the present invention. In the embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without any creative effort.

FIG. 1 is an application scenario diagram according to an embodiment of the present application.

FIG. 2 is a schematic flowchart of a method for generating a reference signal sequence according to an embodiment of the present application.

FIG. 3 is a schematic structural diagram of an apparatus for generating a reference signal sequence according to an embodiment of the present application.

FIG. 4 is another schematic structural diagram of an apparatus for generating a reference signal sequence according to an embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The terms "component", "module", "system" and the like are used in this specification to refer to a computer-related entity, hardware, firmware, a combination of hardware and software, software, or software in execution. For example, a component may be, but is not limited to, a process running on a processor, a processor, an object, an executable, a thread of execution, a program, and/or a computer. By way of illustration, both an application running on a computing device and the computing device may be components. One or more components may reside within a process and/or thread of execution, and a component may be localized on one computer and/or distributed between 2 or more computers. In addition, these components can execute from various computer readable media having various data structures stored thereon. A component may, for example, be based on a signal having one or more data packets (eg, data from two components interacting with another component between a local system, a distributed system, and/or a network, such as the Internet interacting with other systems via signals) Communicate through local and/or remote processes.

It should be understood that the technical solutions of the embodiments of the present invention can be applied to various communication systems, such as: Global System of Mobile Communication (referred to as "GSM") system, Code Division Multiple Access (Code Division Multiple Access, referred to as "" CDMA") system, Wideband Code Division Multiple Access (WCDMA for short) system, Long Term Evolution (Long Term Evolution, referred to as "LTE") system, LTE Frequency Division Duplex (Frequency Division Duplex, for short) "FDD") system, LTE Time Division Duplex ("TDD"), Universal Mobile Telecommunication System ("UMTS"), 5G communication system, and future wireless communication systems, etc. .

The present disclosure describes various embodiments in conjunction with user equipment. User Equipment (User Equipment, "UE" for short) may also refer to terminal equipment, access terminal, subscriber unit, subscriber station, mobile station, mobile station, remote station, remote terminal, mobile equipment, user terminal, terminal, wireless communication device, user agent, or user device. The access terminal may be a cellular phone, a cordless phone, a Session Initiation Protocol ("SIP" for short) phone, a Wireless Local Loop ("WLL" for short) station, a Personal Digital Assistant (Personal Digital Assistant) , referred to as "PDA"), handheld devices with wireless communication capabilities, computing devices or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, terminal devices in future 5G networks or future evolved PLMN networks. terminal equipment, etc.

The present disclosure describes various embodiments in conjunction with network equipment. The network device may be a device for communicating with user equipment, for example, it may be a base station (Base Transceiver Station, referred to as "BTS") in a GSM system or CDMA, or a base station (NodeB, referred to as "BTS") in a WCDMA system "NB"), it can also be an evolved base station (Evolutional Node B, referred to as "eNB" or "eNodeB") in the LTE system, or the network device can be a relay station, an access point, a vehicle device, a wearable device, and Network side equipment in the future 5G network or network equipment in the future evolved PLMN network, etc.

FIG. 1 shows a schematic architecture diagram of a communication system to which an embodiment of the present invention is applied. As shown in FIG. 1 , the communication system 100 may include a network device 102 and user equipments 104 to 114 (referred to as UEs in the figure) connected by wireless connection or wired connection or other means.

The network in this embodiment of the present invention may refer to a public land mobile network (Public Land Mobile Network, “PLMN” for short), a D2D network, an M2M network, or other networks. FIG. 1 is a simplified schematic diagram of an example, and other networks may also be included in the network. equipment, not shown in Figure 1.

When there are too many user equipments, the number of available reference signals cannot guarantee that the reference signals used by different user equipments are different, so the user equipment and other user equipments need to share the reference signals. When the user equipment using the shared reference signal accesses the network, the network equipment may not be able to identify which user equipment is connected through the reference signal, and when the reference signal collides, the network equipment cannot perform accurate user detection and channel estimation , the user equipment data cannot be successfully demodulated.

Aiming at the problem of insufficient number of reference signals in the prior art, a second-order Reed-Muller (RM) sequence can be used to generate a reference signal sequence. Since the generation method of the second-order Reed-Muller sequence can generate a large number of sequences, the number of reference signal sequences is much larger than the number of existing available reference signal sequences, so that different user equipments can use different reference signal sequences, which improves network equipment. The success rate of user equipment identification (or detection) based on the reference signal sequence reduces the probability of collision of reference signals of different user equipments. In addition, due to the large sequence space of different second-order RM sequences, the sequence elements are simple, and only consist of real numbers, or real numbers and pure imaginary numbers. When detecting the reference signal sequence generated based on the second-order RM sequence, a fast reconstruction algorithm can be used. The complexity of reference signal sequence detection is greatly reduced.

The generation method of the first second-order RM sequence:

The order function used to generate the second-order RM sequence can be defined as:

where P is a binary symmetric matrix with m rows and m columns, x and b are binary vectors of length m, respectively, i ² =-1. Here all elements of P, x, b are either 0 or 1. x is the m-bit binary vector of the element number q in the sequence, q=1,...2 ^m , bin(q-1) means converting the integer q-1 into an m-bit binary vector, and the conversion process can be understood as: The integer q is represented as a binary vector of m bits, and the value of each bit in the string is used as a primary color in the binary vector. For example, if the element serial number is 5, and the value of m is also 4, then a=(00100). Given any given P and b, a codeword with 2 ^m elements can be generated, which is a sequence. There are 2 ^{m (m-1)/2} different Ps and 2 ^m different bs, a total of 2 ^m(m+1)/2 sequences can be generated, and then based on the generated 2 ^m(m+1) The ^/2 second-order RM sequence generates the reference signal sequence. This way of generating reference signal sequences can provide a large number of reference signal sequences to meet the requirements of large-scale (mass) access.

The second generation method of second-order RM sequence

其中

表示向下取整。由上述公式2可以看出，对于每一个固定的P矩阵，任意改变向量b的值，可以生成2^m个正交RM序列的空间。当r＝0时，由不同P矩阵生成的RM序列相关性为

当r进一步增大时，两个不同的P矩阵对应生成的序列最大相关性为

即随着r的变大，对应生成的序列相关性逐渐变大。Among them, weight(b) represents the number of elements "1" in the binary vector b, and the meanings of other parameters are the same as those in Formula 1. The length of the second-order RM sequence generated by Equation 2 is 2 ^m . All RM sequences of length 2 ^m can generate a sequence space of 2 ^m(r+2) , which determines the maximum number of available sequences is 2 ^m(r+2) . The minimum value of r is 0 and the maximum value is

in

Indicates rounded down. It can be seen from the above formula 2 that, for each fixed P matrix, by arbitrarily changing the value of the vector b, a space of 2 ^m orthogonal RM sequences can be generated. When r=0, the RM sequence correlations generated by different P matrices are

When r is further increased, the maximum correlation of the sequences generated by two different P matrices is:

That is, as r becomes larger, the corresponding generated serial correlation gradually becomes larger.

In the above two methods of second-order RM sequence, the selection of P matrix and b vector is independent of each other, and the cross-correlation of corresponding generated RM sequences is very different, which is not conducive to user detection. When the reference signal sequence is detected, the detection accuracy is low and the complexity is high. Since the second-order RM sequence is not a completely orthogonal sequence, its non-completely orthogonal characteristic makes the detection performance suffer after passing through the noise channel.

The present application provides a method for generating a reference signal sequence, which can be applied to a UE to generate a reference signal to be sent to a network device, and can also be applied to a network device to generate a reference signal to be sent to a user equipment. The method is described below by taking the method applied to the UE as an example.

As shown in Figure 2, the method for generating a reference signal sequence includes:

Step S20, determine the order m of the binary symmetric matrix for generating the second-order RM sequence;

Step S22, determine a binary symmetric matrix P of order m and a binary vector b of m*1;

Step S24, generate a second-order RM sequence according to the determined binary symmetric matrix P, the binary vector b and the second-order RM sequence generation formula;

Step S26, extending or truncating the second-order Reed-Muller sequence into a reference signal sequence with a length of L.

In an embodiment, step S20 specifically includes: determining the order m according to the length L of the reference signal sequence. It can be seen from the foregoing that the length of the second-order RM sequence is 2 ^m . If an integer g is such that the length 2 ^g of the second-order RM sequence is closest to the length L of the reference signal sequence, then the integer g is determined as the order m determined in step 20 .

In an embodiment, the network device may directly configure the length L of the reference signal sequence for the UE. In another embodiment, the network device does not directly configure the length L of the reference signal sequence for the UE, but configures the generation parameter of the reference signal for the UE, and the generation parameter of the reference signal includes one or more of the following parameters: The resource pattern of the signal (or the mapping rule from the reference signal sequence to the time-frequency resource), the number of OFDM symbols occupied by the reference signal, and the number of frequency domain resources used for sending the reference signal. The above parameters may be calculated according to one or more of the above parameters. For example, if the resource pattern of the reference signal is a comb pattern, it can be calculated according to the number of positions in the comb pattern where elements of the reference signal sequence can be mapped, the number of OFDM symbols occupied by the reference signal, and the number of frequency domain resources used for sending the reference signal. The length L of the reference signal sequence. In some embodiments, only one of the above parameters may be needed to determine the length L of the reference signal sequence. For example, each element of the default reference signal sequence is on each allocated frequency domain resource, and the reference signal occupies The number of OFDM symbols is also the default. In this case, the length of the reference signal sequence can be determined only by knowing the number of frequency domain resources used to transmit the reference signal.

In an embodiment, step S20 specifically includes: acquiring the order m from the received configuration message from the network device. In this embodiment, the network device may specify a value of m for the UE, and notify the UE through a configuration message. The configuration message may be downlink control information (downlink control information, dci), radio resource control (radio resource control, rrc) signaling, or media access control control element (Media Access Control Control Element, MAC CE).

In an embodiment, step S20 specifically includes: determining the order m according to the number of resource elements (Resource Element, RE) used for transmitting the reference signal sequence. The number of resource elements used for transmitting the reference signal sequence is actually the length L of the reference signal sequence. In this embodiment, for the process of determining the order m and the number of resource particles, reference may be made to the corresponding part of determining the order m according to the length L of the reference signal sequence, which will not be repeated here.

In an embodiment, step S20 specifically includes: determining the order m according to the time-frequency resources used for sending the reference signal sequence. The number of resource elements used for transmitting the reference signal sequence is determined according to the time-frequency resources used for the reference signal sequence, and then the order m is determined according to the determined number of resource elements. For the specific process of determining the order m according to the number of resource particles, refer to the corresponding description in the foregoing, and details are not repeated here.

In an embodiment, step S20 specifically includes: determining the order m according to the resource pattern of the reference signal and the time-frequency resource used for sending the reference signal sequence. The number of resource elements for transmitting the reference signal sequence is determined according to the resource pattern of the reference signal and the time-frequency resources for transmitting the reference signal sequence, and then the order m is determined according to the determined number of resource elements. For the specific process of determining the order m according to the number of resource particles, refer to the corresponding description in the foregoing, and details are not repeated here.

In one embodiment, the binary symmetric matrix P and the binary vector b determined in step S22 satisfy a preset correspondence relationship. For example, a binary symmetric matrix P can correspond to one or more binary vectors b. When a specific binary symmetric matrix P is determined, only one of the binary vectors corresponding to the binary symmetric matrix can be determined as The binary vector b in step S22. The correspondence between the binary symmetric matrix P and the binary vector b can make the different second-order RM sequences finally generated have better sequence cross-correlation and improve the sequence detection performance.

In an embodiment, the elements in the binary vector b determined in step S22 and the elements in the binary symmetric matrix P satisfy a preset operation relationship. In this embodiment, each element in the binary vector b is obtained by operating some or all of the elements in the binary symmetric matrix P according to a preset operation relationship. Once the binary symmetric matrix P is determined, the binary vector b is no longer any binary vector, but is constrained by the binary symmetric matrix P. This constraint relationship can make the final generated different second-order RM sequences have good sequence cross-correlation and improve the detection performance of the sequence.

In an embodiment, the binary vector b can be represented as [b _m , b _m-1 , . . . , b ₁ ], wherein the value of the element b _q in the binary vector b is the binary symmetric matrix The result of the modular two addition of all elements in the (m+ ₁ -q)th row of the upper triangular matrix of , q=2,... The result of modulo two addition.

For example, a binary symmetric matrix can be represented as follows:

Define vector α ^s =[p _{(s, 1)} ,..., p _{(s, s-1)} ] ^T , 2≤s≤m, then the binary vector b=[b _m can be determined according to the following operational relationship, b _m-1 ,...,b ₁ ] according to the value of each element in:

表示模二加运算(或者异或运算)，

为向量α^s中第n个元素的取值，n＝1,…s-1；b_m的取值为二元对称矩阵P矩阵的上三角阵中第一行所有元素的模二加，依次类推，b₁取值为二元向量b中其余m-1个元素的模二加。in,

Represents a modulo two addition operation (or an exclusive OR operation),

is the value of the nth element in the vector α ^s , n=1,...s-1; the value of b _m is the modulo two addition of all elements in the first row of the upper triangular matrix of the binary symmetric matrix P matrix, in turn By analogy, b ₁ takes the value of the modulo two addition of the remaining m-1 elements in the binary vector b.

恒为偶数，使得利用参考信号进行的用户活跃性检测的算法复杂度降低，检测精度提升。以牺牲二阶RM序列的序列空间为代价，改善用户检测性能。同时序列空间仍远大于NR DMRS设计，有力支持大连接场景。The binary vector b determined by the above method can make (-1) ^weight(b) ≡1,

It is always an even number, which reduces the algorithm complexity of the user activity detection using the reference signal and improves the detection accuracy. Improve user detection performance at the expense of the sequence space of second-order RM sequences. At the same time, the sequence space is still much larger than the NR DMRS design, which strongly supports large connection scenarios.

There are many ways to determine the binary symmetric matrix P in step S22. For example, the network device may select a binary symmetric matrix from a preset set of m-order binary symmetric matrices, and notify the UE of the index of the binary symmetric matrix through a configuration message. The set of binary symmetric matrices of order m determines the binary symmetric matrix P. This preset set of m-order binary symmetric matrices may be specified by a communication protocol complied with by the network device and the UE, or determined by the network device and notified to the UE.

In another embodiment, the binary symmetric matrix P may be determined according to the following manner: the UE determines an initial value according to preset functions and parameters, and the mapping relationship between the initial value and the preset initial value and the index of the binary symmetric matrix is determined. , determine the index of the binary symmetric matrix corresponding to the initial value, and determine, according to the determined index and a preset set of m-order binary symmetric matrices, that the binary symmetric matrix P parameters include the user equipment identification ID, and the system At least one of the frame number, the time slot number, the symbol number of the reference signal, the cell ID, and the user ID.

In a specific example, the function that determines the initial value cinit is as follows:

为用户ID值，其可以由网络设备通过高层信令(例如rrc信令)为UE配置的，n_SCID∈{0，1}表示一个用户ID值的指示标号，此外X<＝Y，X,Y取大于1的任意整数即可。可以理解的是，上述确定初始值的函数仅仅是一个示例，其还可以是其它的函数，本申请不做限定。Among them, n _s represents the slot number in a system frame, l represents the symbol number of the reference signal in this slot,

is the user ID value, which can be configured by the network device for the UE through high-layer signaling (such as rrc signaling), n _SCID ∈ {0, 1} represents an indication label of a user ID value, and X<=Y, X, Y can be any integer greater than 1. It can be understood that the above function for determining the initial value is only an example, and it may also be other functions, which are not limited in this application.

In a specific example, the function that determines the initial value cinit is as follows:

f(·)可以为任意函数，Z即为网络设备给用户设备配的数值，n_s表示1个系统帧中的slot编号，

表示小区ID。本方案可以应用于随机接入过程中的preamble序列的生成。

f( ) can be any function, Z is the value assigned by the network device to the user equipment, n _s represents the slot number in a system frame,

Indicates the cell ID. This solution can be applied to the generation of the preamble sequence in the random access process.

In an embodiment, the above-mentioned initial value may be mapped to an index of a binary symmetric matrix by a preset function such as f(c _init ), and then determined according to the index and a preset set of m-order binary symmetric matrices The binary symmetric matrix corresponding to this index.

In an embodiment, the above-mentioned initial value c _init can be converted into a binary vector of length Y; each element in the binary vector is filled into the upper triangular matrix in the binary symmetric matrix P in Equation 3 and / or the lower triangular matrix, so that the above-mentioned binary symmetric matrix P can be constructed.

In one embodiment, filling each element in the binary vector into the upper triangular matrix and/or the lower triangular matrix in the binary symmetric matrix P in Formula 3 includes:

Extend the binary vector into a binary vector of length m(m-1)/2;

Fill the upper triangular matrix and/or the lower triangular matrix in the binary symmetric matrix P with preset rules of each element in the m(m-1)/2-length vector. The preset rule may be, for example, that each position in the upper triangular matrix or the lower triangular matrix is filled sequentially from left to right and from top to bottom. It can be understood that there may also be other preset rules, which are not limited in this application.

There are many ways to expand a binary vector of length Y into a binary vector of length m(m-1)/2, for example, by padding "0" or encoding the length Y of the binary vector to length. m(m-1)/2.

In this embodiment, the diagonal elements of the above-mentioned binary symmetric matrix P are all 0, for example, as shown in formula 3.

In another embodiment, filling each element in the binary vector into the upper triangular matrix and/or the lower triangular matrix in the binary symmetric matrix P in Formula 3 includes:

Extend the binary vector into a binary vector of length m(m+1)/2;

Fill the upper triangular matrix and/or the lower triangular matrix in the binary symmetric matrix P with preset rules of each element in the m(m+1)/2-long vector.

In this embodiment, the diagonal elements of the above-mentioned binary symmetric matrix P may not be 0.

In one embodiment, the second-order RM sequence generation formula in step S24 includes:

或者

or

其中，

in,

φ _{P, b} (j) is the value of the jth element in the second-order Reed-Muller sequence, weight(b) is the number of "1" in the binary vector b, i ² =-1, P is the For the binary symmetric matrix, a _j-1 is a binary vector of length m, which is converted from an integer value j-1.

It can be known from the previous description that the value of m does not necessarily make the length 2m of the generated second-order RM sequence just equal to the length L of the reference signal sequence. Therefore, when the lengths of the two are the same, the second-order RM sequence needs to be extended. or truncated to form the final reference signal sequence.

For example, when the length of the second-order RM sequence is less than L, length matching needs to be performed by means of padding (methods such as cyclic extension) or zero-filling.

For another example, when the length of the second-order RM sequence is greater than L, the second-order RM sequence needs to be truncated into a sequence of length L at this time.

The UE maps each element in the generated reference signal sequence to the time-frequency resources used for sending the reference signal, generates the reference signal, and sends the reference signal to the network device. The time-frequency resource used for sending the reference signal may be configured by the network device for the UE, or may be preset, for example, specified by a protocol.

The reference signal sequence generated by the method in this application can be used as a demodulation reference signal (Demodulation Reference Signal, dmrs) sequence, and can also be used as a preamble sequence in a random access process.

Using the generation method of the reference signal sequence in this application can improve the detection performance of the reference signal sequence, which is mainly reflected in: using the method for determining the binary symmetric matrix P and the binary vector b in this application, combined with the second-order RM sequence itself When performing detection and channel estimation, the correlation peak phase inversion is eliminated, so that the correlation peaks of different users can be added in phase, and at the same time, the interference variance is reduced; the channel estimation is simpler and more accurate; For the scenario where the sequence is randomly extracted from the space for access, the orthogonality of the local subspace of the sequence space has little effect on the system performance.

Corresponding to the above method, the present application further provides an apparatus for generating a reference signal sequence, which is used to execute the method in the foregoing embodiments. As shown in Figure 3, the device includes:

The first determination module 30 is used to determine the order m of the binary symmetric matrix for generating the second-order Reed-Muller sequence;

The second determination module 32 is used to determine an m-order binary symmetric matrix P and an m*1 binary vector b;

The Reed-Muller sequence generation module 34 is configured to generate a second-order Reed-Muller sequence according to the determined binary symmetric matrix P, the binary vector b and the second-order Reed-Muller sequence generation formula;

The reference signal sequence generation module 36 is configured to expand or truncate the second-order Reed-Muller sequence into a reference signal sequence of length L.

In one embodiment, the first determining module 30 is specifically configured to:

determining the order m according to the length L of the reference signal sequence; or

obtain the parameter m from a received configuration message from the network device; or

The order m is determined according to the number of resource elements used for transmitting the reference signal sequence; or;

The order m is determined according to the time-frequency resource used for transmitting the reference signal sequence; or

The order m is determined according to the resource pattern of the reference signal and the time-frequency resources used for transmitting the reference signal sequence.

In an embodiment, the elements in the binary vector b and the elements in the binary symmetric matrix P satisfy a preset operation relationship.

In one embodiment, the binary vector b is [b _m , b _m-1 , . . . , b ₁ ], wherein the value of the element b _q in the binary vector b is the binary The result of the modular two addition of all elements in the (m+1-q)th row of the upper triangular matrix of the symmetric matrix, q=2, ... m; the value of the element b ₁ in the binary vector b is the The result of the modular two addition of all other elements in the binary vector b.

In one embodiment, the second determining module 32 is specifically configured to:

The binary symmetric matrix P is determined according to the index of the binary symmetric matrix carried in the configuration message from the network device and a preset set of m-order binary symmetric matrices; or

An initial value is determined according to a preset function and parameter, wherein the parameter includes at least one of the ID of the user equipment, the system frame number, the time slot number, the symbol number of the reference signal, and the cell ID; according to the initial value and the mapping relationship between the preset initial value and the index of the binary symmetric matrix, determine the index of the binary symmetric matrix corresponding to the initial value; according to the determined index and the preset preset m-order binary symmetry the set of matrices determines the binary symmetric matrix P; or

An initial value is determined according to a preset function and parameter, wherein the parameter includes at least one of a user equipment identification ID, a system frame number, a time slot number, a symbol number of a reference signal, and a cell ID; the initial value is Converting into a binary vector; filling the value of each bit of the binary vector into the upper triangular matrix and/or the lower triangular matrix in the binary symmetric matrix P.

In one embodiment, the second determining module 32 is specifically configured to:

Extending the binary vector into a binary vector of length m(m-1)/2;

Fill the upper triangular matrix and/or the lower triangular matrix in the binary symmetric matrix P with the value of each bit in the m(m-1)/2-long binary vector according to a preset rule.

In one embodiment, the second-order Reed-Muller sequence generation formula includes:

或者

or

其中，

in,

φ _{P, b} (j) is the value of the jth element in the second-order Reed-Muller sequence, weight(b) is the number of "1" in the binary vector b, i ² =-1, P is the For the binary symmetric matrix, a _j-1 is a binary vector of length m, which is converted from an integer value j-1.

For the specific processing procedures of the foregoing modules, reference may be made to the corresponding descriptions in the foregoing embodiments, and details are not repeated here.

FIG. 4 is a schematic block diagram of an apparatus 400 for generating a reference signal according to an embodiment of the present application. As shown in FIG. 4 , the apparatus 400 includes a processor 410 , a transceiver 430 and a bus system 940 . Optionally, the apparatus 400 may further include a memory 920 for storing program instructions. Processor 910 may invoke program instructions stored in memory 920 . The processor 910 , the memory 920 and the transceiver 930 are connected by a bus system 940 .

Wherein, the processor 910 is configured to call the program instructions stored in the memory 920, and perform the following operations: determine the order m of the binary symmetric matrix used to generate the second-order Reed-Muller sequence;

Determine a binary symmetric matrix P of order m and a binary vector b of m*1;

Generate a second-order Reed-Muller sequence according to the determined binary symmetric matrix P, the binary vector b and the second-order Reed-Muller sequence generation formula;

The second-order Reed-Muller sequence is extended or truncated into a reference signal sequence of length L.

In one embodiment, the determining the order m of the binary symmetric matrix for generating the second-order Reed-Muller sequence includes:

determining the order m according to the length L of the reference signal sequence; or

obtain the parameter m from a received configuration message from the network device; or

The order m is determined according to the number of resource elements used for transmitting the reference signal sequence; or;

The order m is determined according to the time-frequency resource used for transmitting the reference signal sequence; or

The order m is determined according to the resource pattern of the reference signal and the time-frequency resources used for transmitting the reference signal sequence.

In an embodiment, the elements in the binary vector b and the elements in the binary symmetric matrix satisfy a preset operation relationship.

In one embodiment, the binary vector b is [b _m , b _m-1 , . . . , b ₁ ], wherein the value of the element b _q in the binary vector b is the binary The result of the modular two addition of all elements in the (m+1-q)th row of the upper triangular matrix of the symmetric matrix P, q=2, ... m; the value of the element b ₁ in the binary vector b is all The result of the modular two addition of all other elements in the binary vector b.

In one embodiment, the determining an m-order binary symmetric matrix P includes:

The binary symmetric matrix P is determined according to the index of the binary symmetric matrix carried in the configuration message from the network device and a preset set of m-order binary symmetric matrices; or

An initial value is determined according to a preset function and parameter, wherein the parameter includes at least one of the ID of the user equipment, the system frame number, the time slot number, the symbol number of the reference signal, and the cell ID; according to the initial value and the mapping relationship between the preset initial value and the index of the binary symmetric matrix, determine the index of the binary symmetric matrix corresponding to the initial value; according to the determined index and the preset preset m-order binary symmetry the set of matrices determines the binary symmetric matrix P; or

An initial value is determined according to a preset function and parameter, wherein the parameter includes at least one of a user equipment identification ID, a system frame number, a time slot number, a symbol number of a reference signal, and a cell ID; the initial value is Converting into a binary vector; filling the value of each bit of the binary vector into the upper triangular matrix and/or the lower triangular matrix in the binary symmetric matrix P.

In one embodiment, filling the value of each bit of the binary vector into the upper triangular matrix and/or the lower triangular matrix in the binary symmetric matrix P includes:

Extending the binary vector into a binary vector of length m(m-1)/2;

Fill the upper triangular matrix and/or the lower triangular matrix in the binary symmetric matrix P with the value of each bit in the m(m-1)/2-long binary vector according to a preset rule.

In one embodiment, the second-order Reed-Muller sequence generation formula includes:

或者

or

其中，

in,

φ _{P, b} (j) is the value of the jth element in the second-order Reed-Muller sequence, weight(b) is the number of "1" in the binary vector b, i ² =-1, P is the For the binary symmetric matrix, a _j-1 is a binary vector of length m, which is converted from an integer value j-1.

The transceiver 430 is used for transmitting the generated reference signal sequence.

It should be understood that the apparatus 400 may correspond to the UE device in the method embodiment shown in FIG. 2 , and may have corresponding functions thereof, which will not be repeated here for brevity.

In one embodiment, the apparatus 400 is specifically a chip, and the transceiver 400 may be specifically a communication interface of the chip.

In an embodiment, the apparatus 400 is specifically a user equipment, and the transceiver 400 may specifically be a radio frequency transceiver circuit of the user equipment.

The device in the embodiment of the present application may be a Field-Programmable Gate Array (FPGA), an Application Specific Integrated Circuit (ASIC), or a System on Chip (SoC), or It can be a central processing unit (Central ProcessorUnit, CPU), a network processor (Network Processor, NP), a digital signal processing circuit (Digital Signal Processor, DSP), or a microcontroller (Micro Controller Unit) , MCU), can also be a programmable controller (Programmable Logic Device, PLD) or other integrated chips.

Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each particular application, but such implementations should not be considered beyond the scope of the present invention.

Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the above-described systems, devices and units may refer to the corresponding processes in the foregoing method embodiments, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not implemented. On the other hand, the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of 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 components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution in this embodiment.

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

The functions, if implemented in the form of software functional units and sold or used as independent products, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention can be embodied in the form of a software product in essence, or the part that contributes to the prior art or the part of the technical solution. The computer software product is stored in a storage medium, including Several instructions are used to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes: U disk, removable hard disk, read-only memory (ROM, Reed-Only Memory), random access memory (RAM, Random Access Memory), magnetic disk or optical disk and other media that can store program codes .

The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited to this. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention. should be included within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (15)

1. A method of generating a reference signal sequence, comprising:

determining the order number m of a binary symmetric matrix for generating a second-order Reed-Muller sequence;

determining a binary symmetric matrix P of m orders and a binary vector b of m x 1; the middle element of the binary vector b and the element of the binary symmetric matrix meet a preset operational relationship;

generating a second-order Reed-Muller sequence according to the determined binary symmetric matrix P, the binary vector b and a second-order Reed-Muller sequence generating formula;

and expanding or truncating the second-order Reed-Muller sequence into a reference signal sequence with the length L.

2. The method of claim 1, wherein the determining the order m of the binary symmetric matrix used to generate the second order Reed-Muller sequence comprises:

determining the order m according to the length L of the reference signal sequence; or

Acquiring the order m from a received configuration message from network equipment; or

Determining the order m according to the number of resource particles for transmitting the reference signal sequence; or;

determining the order m according to a time-frequency resource used for sending a reference signal sequence; or

And determining the order m according to the resource pattern of the reference signal and the time-frequency resource used for sending the reference signal sequence.

3. The method of claim 1, wherein the binary vector b is [ b [ ]_m,b_m-1,…,b₁]Wherein, the element b in the binary vector b_qIs the result of modulo-two addition of all elements of the (m +1-q) th row in the upper triangular matrix of the binary symmetric matrix P, q being 2, … m; element b in the binary vector b₁The value of (b) is the result of modulo-two addition of all other elements in the binary vector b.

4. The method of claim 1, wherein determining a m-th order binary symmetric matrix P comprises:

determining a binary symmetric matrix P according to an index of a binary symmetric matrix carried by a configuration message from network equipment and a set of preset m-order binary symmetric matrices; or

Determining an initial value according to a preset function and parameters, wherein the parameters comprise at least one of a user equipment Identification (ID), a system frame number, a time slot number, a symbol number of a reference signal and a cell ID; determining the index of the binary symmetric matrix corresponding to the initial value according to the initial value and the mapping relation between the preset initial value and the index of the binary symmetric matrix; determining the binary symmetric matrix P according to the determined index and a preset set of m-order binary symmetric matrices; or

Determining an initial value according to a preset function and parameters, wherein the parameters comprise at least one of a user equipment Identification (ID), a system frame number, a time slot number, a symbol number of a reference signal and a cell ID; converting the initial values into binary vectors; and filling the numerical value of each bit of the binary vector into an upper triangular matrix and/or a lower triangular matrix in the binary symmetric matrix P.

5. The method of claim 4, wherein padding values of bits of the binary vector to an upper triangular matrix and/or a lower triangular matrix of the binary symmetric matrix P comprises:

expanding the binary vector into a binary vector of m (m-1)/2 length;

filling the numerical value of each bit in the binary vector with the length of m (m-1)/2 into an upper triangular matrix and/or a lower triangular matrix in the binary symmetric matrix P according to a preset rule.

6. The method of any of claims 1 to 5, wherein the second order Reed-Muller sequence generation formula comprises:

or

Wherein,

φ_P，b(j) weight (b) represents the number of "1" in binary vector b, i is the value of the jth element in the second order Reed-Muller sequence²P is said binary symmetric matrix, a_j-1Is a binary vector of length m, which is converted from the integer value j-1.

7. An apparatus for generating a reference signal sequence, the apparatus comprising:

the first determining module is used for determining the order number m of a binary symmetric matrix used for generating a second-order Reed-Muller sequence;

a second determining module, configured to determine an m-order binary symmetric matrix P and a m × 1 binary vector b; the middle element of the binary vector b and the element of the binary symmetric matrix P meet a preset operational relationship;

a Reed-Muller sequence generation module, configured to generate a second-order Reed-Muller sequence according to the determined binary symmetric matrix P, the binary vector b, and a second-order Reed-Muller sequence generation formula;

and the reference signal sequence generating module is used for expanding or truncating the second-order Reed-Muller sequence into a reference signal sequence with the length of L.

8. The apparatus of claim 7, wherein the first determining module is specifically configured to:

determining the order m according to the length L of the reference signal sequence; or

Acquiring the order m from a received configuration message from network equipment; or

Determining the order m according to the number of resource particles for transmitting the reference signal sequence; or;

determining the order m according to a time-frequency resource used for sending a reference signal sequence; or

And determining the order m according to the resource pattern of the reference signal and the time-frequency resource used for sending the reference signal sequence.

9. The apparatus of claim 7, wherein the binary vector b is [ b [ ]_m，b_m-1，...，b₁]Wherein, the element b in the binary vector b_qIs the result of modulo-two addition of all elements of the (m +1-q) th row in the upper triangular matrix of the binary symmetric matrix, q being 2.. m; element b in the binary vector b₁The value of (b) is the result of modulo-two addition of all other elements in the binary vector b.

10. The apparatus of claim 7, wherein the second determining module is specifically configured to:

determining a binary symmetric matrix P according to an index of a binary symmetric matrix carried by a configuration message from network equipment and a set of preset m-order binary symmetric matrices; or

Determining an initial value according to a preset function and parameters, wherein the parameters comprise at least one of a user equipment Identification (ID), a system frame number, a time slot number, a symbol number of a reference signal and a cell ID; determining the index of the binary symmetric matrix corresponding to the initial value according to the initial value and the mapping relation between the preset initial value and the index of the binary symmetric matrix; determining the binary symmetric matrix P according to the determined index and a preset set of m-order binary symmetric matrices; or

Determining an initial value according to a preset function and parameters, wherein the parameters comprise at least one of a user equipment Identification (ID), a system frame number, a time slot number, a symbol number of a reference signal and a cell ID; converting the initial values into binary vectors; and filling the numerical value of each bit of the binary vector into an upper triangular matrix and/or a lower triangular matrix in the binary symmetric matrix P.

11. The apparatus of claim 10, wherein the second determining module is specifically configured to:

expanding the binary vector into a binary vector of m (m-1)/2 length;

filling the numerical value of each bit in the binary vector with the length of m (m-1)/2 into an upper triangular matrix and/or a lower triangular matrix in the binary symmetric matrix P according to a preset rule.

12. The apparatus of any of claims 7 to 11, wherein the second order Reed-Muller sequence generation formula comprises:

or

Wherein,

φ_P，b(j) weight (b) represents the number of "1" in binary vector b, i is the value of the jth element in the second order Reed-Muller sequence²P is said binary symmetric matrix, a_j-1Is a binary vector of length m, which is converted from the integer value j-1.

13. An apparatus for generating a reference signal sequence, the apparatus comprising a processor configured to enable the apparatus to perform the method of any of claims 1-6 and a transceiver, the transceiver being specifically configured to transmit the generated reference signal sequence.

14. A computer-readable storage medium, in which a computer program code is stored, which, when executed by a processing unit or a processor, causes the processing unit or an apparatus on which the processor is located to perform the method of any of claims 1 to 6.

15. A communication chip having instructions stored therein which, when run on a communication device, cause the communication device to perform the method of any one of claims 1 to 6.

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