CN113170486B

CN113170486B - Communication method and device

Info

Publication number: CN113170486B
Application number: CN201980076990.8A
Authority: CN
Inventors: 曲秉玉; 李雪茹; 周永行; 张瑞齐
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2018-12-11
Filing date: 2019-08-08
Publication date: 2022-08-26
Anticipated expiration: 2039-08-08
Also published as: WO2020119154A1; CN113170486A; WO2020118536A1

Abstract

A communication method and device comprises the following steps: the terminal equipment generates a reference signal sequence with the length of M; the reference signal sequence is generated by a base sequence with the length of M in a first sequence group allocated to the terminal equipment, the number of the base sequences with the length of M in the first sequence group is X, and the ith base sequence in the X base sequences is generated by a ZC sequence with the length of N and the root index of qi; wherein, when X is an integer greater than or equal to 2, the root index of the first ZC sequence corresponding to the first sequence of any two base sequences in the X base sequences is q, the root index of the second ZC sequence corresponding to the second sequence of any two base sequences is (q + V) mod N, the absolute value of V is an integer greater than or equal to K1 and less than or equal to N-K1, K1> 1; or X is greater than or equal to 3, the root index of the first ZC sequence is q, the root index of the second ZC sequence is (q + V) mod N, the root index of the third ZC sequence generating the third sequence is (q + V) mod N, the absolute value of V is 1, the absolute value of W is greater than K2 and less than N-K2, or the absolute value of V and the absolute value of W are integers greater than or equal to K3 and less than or equal to N-K3, the third sequence is any one of the X base sequences except the first sequence and the second sequence; the terminal equipment transmits a reference signal sequence.

Description

Communication method and device

Cross Reference to Related Applications

This application claims priority from a patent application filed by the chinese patent office on 11/12/2018 with application number PCT/CN2018/120412 entitled "a communication method and apparatus", the entire contents of which are incorporated herein by reference.

Technical Field

The present application relates to the field of wireless communications technologies, and in particular, to a communication method and apparatus.

Background

In Long Term Evolution (LTE) and New Radio (NR) systems, uplink reference signals, such as uplink demodulation reference signals (DMRS) and uplink Sounding Reference Signals (SRS), are sequences generated from a Base Sequence (Base Sequence), for example, a Sequence with a length of M is r (M), M is 0,1, 2, and M-1, and then the Sequence generated from the Base Sequence may be a Sequence generated from the Base Sequence

A·exp(jαm)·r(m)，m＝0，1，2，...，M-1，

Where M is an integer greater than 1, α is a value determined by a time domain cyclic shift value, is a real number, j is a unit of an imaginary number, and a is a complex number.

The base sequence mentioned above may be a sequence generated by a ZC (Zadoff-Chu) sequence, such as the ZC sequence itself, or a sequence generated by cyclic extension or truncation of the ZC sequence. For example, a ZC sequence of length N is z _q (N), N is 0,1,.., N-1, then the length-M sequence generated by the ZC sequence can be expressed as: z is a radical of _q (M mod N), M ═ 0, 1.., M-1. Wherein, the ZC sequence of length N may be represented as follows:

wherein N is the length of the ZC sequence and is an integer greater than 1; q is a root index of the ZC sequence, is a natural number coprime to N, and q is more than 0 and less than N.

Taking the uplink reference signal as the SRS, before the terminal device sends the SRS, the terminal device needs to determine the SRS sequence according to the base sequence. In the 3rd generation partnership project (3 GPP) standard, lengths M of various SRS sequences are determined, and 60 base sequences are defined for values of M greater than or equal to 72, wherein the 60 base sequences are generated from ZC sequences having the same length and different root indexes. Further, the 60 base sequences are divided into 30 groups, and different groups of base sequences may be allocated to different cells. Taking M72 as an example, 30 sets of base sequences are generated as ZC sequences of length 71, and the relationship between the root index of these ZC sequences and the group number of the base sequence can be referred to as shown in table 1:

TABLE 1

Each cell may allocate 2 base sequences of the same length to the terminal device to generate the finally transmitted SRS sequence. In a cell, terminal devices that transmit SRS sequences of the same length at the same time use SRS sequences generated from the same base sequence in the group. When the SRS sequences are generated by using the same base sequence, the terminal devices obtain orthogonality between the SRS sequences by using different time domain cyclic shifts and/or time-frequency domain resources. In an actual system, 2 base sequences in the same group are used as hopping sequences, that is, at different time, a base sequence adopted by a terminal device can hop among the 2 base sequences in the group according to a designed pattern, which aims at randomization of inter-cell interference. In the process of hopping sequences, all terminal devices in a cell which transmit SRS sequences with the same length still use the same base sequence to generate SRS sequences at the same time.

The number of terminal devices in each cell is large (e.g., 200), and the number of time domain cyclic shifts and the number of available time-frequency domain resources that can achieve good orthogonality in an actual system are limited. Therefore, the number of available SRS sequences in a cell at present is far from the number of terminal devices. This results in the need to have different terminal devices transmit SRS in turn in a time division manner, resulting in a larger SRS period, for example, 20 ms. However, the channel has a time-varying characteristic, the channel state information obtained through the SRS is easily outdated due to a large SRS period, and the channel state information during downlink data transmission is greatly different from the channel state information measured according to the SRS, which seriously affects the performance of the system.

In order to improve the accuracy of the channel state information and avoid a serious outdated problem of the channel state information, one scheme is to directly expand 2 base sequences in the same group in the prior art to be simultaneously used, specifically, see documents 1 "R1-1712239," UL SRS sequence design in NR ", Huawei, HiSilicon, August 2017" and documents 2 "R1-1716374," Details on SRS design ", Ericsson, sep., 2017". The 2 ZC sequences of the same group are allocated to different terminal devices at the same time. Then, at the same time, the number of ZC sequences of the same length included in each group is changed from 1 to 2, the number of terminal devices that can transmit SRS sequences of the same length at the same time is 2 times that of the terminal devices, and the period of SRS supported is reduced to half of that of the terminal devices. However, such a scheme is likely to cause large interference between SRS sequences used by different terminal devices of the same cell.

Disclosure of Invention

An object of the embodiments of the present application is to provide a communication method and apparatus, so as to solve a problem that when at least two base sequences having different root indexes and the same length in each group are simultaneously allocated to different terminal devices, interference between reference signal sequences generated by different base sequences is large.

In a first aspect, an embodiment of the present application provides a communication method, including: the terminal equipment generates a reference signal sequence with the length of M, wherein M is an integer larger than 1; the reference signal sequence is generated by a base sequence with the length of M in a first sequence group allocated to the terminal equipment, and the number of the base sequences with the length of M in the first sequence group isX, the ith base sequence in the X base sequences consists of a base sequence with the length of N and a root index of q _i Generated by ZC sequence of (q) _i Is an integer from 1 to N-1, N is an integer greater than 1, and q is an integer greater than 1 when i is different in value _i The values of (A) are different; when X is an integer greater than or equal to 2, the root index of a first ZC sequence corresponding to the first sequence in any two base sequences in the X base sequences is q, the root index of a second ZC sequence corresponding to the second sequence in any two base sequences is (q + V) modN, the absolute value of V is an integer greater than or equal to K1 and less than or equal to N-K1, and K1 is greater than 1; or, when X is an integer greater than or equal to 3, the root index of the first ZC sequence is q, the root index of the second ZC sequence is (q + V) modN, the root index of the third ZC sequence generating a third sequence is (q + W) modN, the absolute value of V is 1, the absolute value of W is greater than K2 and less than N-K2, K2 > 2, or the absolute value of V and the absolute value of W are integers greater than or equal to K3 and less than or equal to N-K3, K3 >1, the third sequence is any one of the X base sequences except the first sequence and the second sequence; and the terminal equipment transmits the reference signal sequence.

By the method provided by the embodiment of the application, when one sequence group comprises two base sequences, the absolute value of V is larger than 1 and smaller than N-1, namely the lower limit of the value is larger than 1, and the upper limit of the value is smaller than N-1. Especially, when the length N of the ZC sequence is larger, the lower limit of the absolute value of the V is larger. N is present, such that the absolute value of V is greater than 2. At this time, the network device may allocate two base sequences with the same length in one sequence group to different terminal devices at the same time, so that the number of reference signal sequences that can be allocated by one network device becomes 2 times that of the original reference signal sequences, interference between the reference signal sequences is not increased while the number of the reference signal sequences is increased, and accuracy of channel estimation based on the reference signal is improved. Accordingly, when at least three base sequences with the same length are included in one sequence group, the network device may allocate the at least three base sequences in one sequence group to different terminal devices at the same time, so that the number of terminal devices that can simultaneously transmit reference signals with the same length and can be supported in one cell may be at least three times as large as the original number. Meanwhile, because the root index of the ZC sequence generating at least three base sequences with the same length in one sequence group is redesigned, the cross correlation of the at least three base sequences in one sequence group can be ensured to be very low, so that the interference between reference signal sequences is much lower than that of a signal, and the channel estimation accuracy based on the reference signal sequences can be improved compared with the prior art.

In one possible design, the ith base sequence of the X base sequences satisfies the following formula:

wherein s is _i (M), M is 0,1, M-1 is the ith base sequence,

to generate a ZC sequence of the ith base sequence.

In one possible design, the method further includes:

the terminal equipment acquires first indication information and second indication information; the first indication information is used for indicating a group identifier of the first sequence group or a cell identifier of the first sequence group, and the second indication information is used for indicating one base sequence in the X base sequences;

and the terminal equipment acquires the reference signal sequence according to the first indication information and the second indication information.

In one possible design, when the group in the first sequence group is identified as u1, the value of V is V1, and when the group in the first sequence group is identified as u2, the value of V is V2, there are differences between u1 and u2, and between V1 and V2;

or when the cell identifier of the first sequence group is c1, the value of V is V1, the value of V is V1, and when the cell identifier of the first sequence group is c2, the value of V is V2, where c1 is different from c2, and V1 is different from V2.

By the method, the value of V is related to the group identifier or the cell identifier of the first sequence group, which is beneficial for the network equipment to allocate the sequence groups, and the number of the base sequences with the length of M in each sequence group is as large as possible, so that the same cell can support more terminal equipment to send the reference signal sequences on the same time-frequency resource, and the interference among the sequences is ensured to be small. For example, the above V1 and V2 may satisfy: if V1 is-V2, a value V1 can be found, which not only ensures that the root index of the ZC sequence that generates the base sequences of the ordered sequence group (for example, 30 sequence groups) is not repeated, but also ensures that the cross-correlation of the base sequences in each sequence group is low, and the cross-correlation of the base sequences in different sequence groups is not increased compared with the prior art. For another example, the absolute value of V1 is not equal to the absolute value of V2, and one value of V1 and V2 may be found, where V is V1 in some sequence groups and V is V2 in other sequence groups, so that it is ensured that the root index of the ZC sequence generating the base sequence of the ordered sequence group (e.g., 30 sequence groups) is not repeated, and at the same time, the cross-correlation of the base sequence in each sequence group is low, and the cross-correlation of the base sequences of different sequence groups is not increased compared with the prior art.

In one possible design, when the length of the first ZC sequence and the length of the second ZC sequence are both the first length, the value of V is V1, and when the length of the first ZC sequence and the length of the second ZC sequence are both the second length, the value of V is V2; there is a difference between the first length and the second length, and an absolute value of the V1 is different from an absolute value of the V2.

By the method, the inter-sequence interference of base sequences with the same length in the first sequence group can be small aiming at different base sequence lengths M. For all base sequences with different lengths, if the absolute values of V are the same, the interference between the base sequences in the first sequence group is small only under the values of some lengths M, and the interference between the base sequences in the first sequence group is large under the values of other lengths M. When the network device allocates the first sequence group to the terminal devices in the cell, the problem still occurs that the sequence interference between the terminal devices transmitting the reference signal sequences with the same length is large. Therefore, under different base sequence lengths M, the absolute value of V has different values, so that sequence interference among a plurality of terminal devices transmitting reference signal sequences of any same length in the same cell is small, and inter-sequence interference among different sequence groups is not increased.

In one possible design, the absolute value of V is any integer in set a1 or set a2 or set A3 or set a4, and the relationship between set a1 or set a2 or set A3 or set a4 and N satisfies at least one row in table 2. The contents of table 2 are specifically shown in the examples section, and are not described herein again.

In one possible design, when X is an integer greater than or equal to 3, V and W satisfy the following equation:

w ═ V; or, W ═ V/2; alternatively, W ═ 2V; or, V is an odd number, W ═ N + V)/2; or, V is an odd number, W ═ N-V)/2; alternatively, V is an odd number and W ═ N-V)/2.

In one possible design, the absolute value of V is any integer in the set S1 or the set S2 or the set S3 or the set S4, and the relationship between the set S1 or the set S2 or the set S3 or the set S4 and N satisfies at least one row in table 7. The contents of table 7 are detailed in the examples section, and are not repeated herein.

In one possible design, a root index q of a ZC sequence of the ith base sequence of the X base sequences is generated _i Satisfying at least one of the following formulas:

b is an integer greater than 1, u is an integer determined according to a group identity of the first sequence group or a cell identity of the first sequence group, v is _i Is set A ═ 0, a ₁ ，...，a _X-1 Element in (b), a _i Is an integer;

Or when X is 3, set

Or when X is 3, the set a is {0, a, -a }, and | a | ≧ 2. Optionally, each element of the set a is a possible value of the absolute value of V.

In a second aspect, an embodiment of the present application provides a communication apparatus, which includes a processor coupled with a memory, wherein: the memory is used for storing instructions; the processor is configured to execute the method according to the first aspect or any one of the possible designs of the first aspect, in accordance with instructions stored by the execution memory. Optionally, the communication device may further include the memory. Optionally, the communication device may further include a transceiver for supporting the communication device to perform information transmission and/or reception in the above method. Optionally, the communication device may be a terminal device, or may be a device in the terminal device, such as a chip or a chip system, where the chip system includes at least one chip, and the chip system may further include other circuit structures and/or discrete devices.

In a third aspect, an embodiment of the present application provides a communication apparatus, configured to implement any one of the foregoing first aspect or the first aspect, where the communication apparatus includes corresponding functional modules, for example, a processing unit, a transceiver unit, and the like, that are respectively configured to implement the steps in the foregoing method.

In a fourth aspect, an embodiment of the present application provides a communication method, including: the network equipment sends configuration information, wherein the configuration information is used for configuring a first sequence group, the number of base sequences with the length of M in the first sequence group is X, the ith base sequence in the X base sequences is formed by the length of N and a root index of q _i Generated by ZC sequence of (q) _i Is an integer from 1 to N-1, N is an integer greater than 1, and q is an integer greater than 1 when i is different in value _i The values of (A) are different; when X is an integer greater than or equal to 2, the root index of a first ZC sequence corresponding to the first sequence in any two base sequences in the X base sequences is q, the root index of a second ZC sequence corresponding to the second sequence in any two base sequences is (q + V) modN, the absolute value of V is an integer greater than or equal to K1 and less than or equal to N-K1, and K1> 1; or, when X is an integer greater than or equal to 3, the root index of the first ZC sequence is q, the root index of the second ZC sequence is (q + V) modN, the root index of the third ZC sequence generating a third sequence is (q + W) modN, the absolute value of V is 1, the absolute value of W is greater than K2 and less than N-K2, K2 > 2, or the absolute value of V and the absolute value of W are integers greater than or equal to K3 and less than or equal to N-K3, K3 >1, the third sequence is any one of the X base sequences except the first sequence and the second sequence; the network device receives a reference signal sequence, which is a base sequence in the first sequence group.

By the method provided by the embodiment of the application, when one sequence group comprises two base sequences, the absolute value of V is larger than 1 and smaller than N-1, namely the lower limit of the value is larger than 1, and the upper limit of the value is smaller than N-1. Especially, when the length N of the ZC sequence is larger, the lower limit of the absolute value of the V is larger. N is present, such that the absolute value of V is greater than 2. At this time, the network device may allocate two base sequences with the same length in one sequence group to different terminal devices at the same time, so that the number of reference signal sequences that can be allocated at one network device becomes 2 times of the original number, interference between the reference signal sequences is not increased while the number of the reference signal sequences is increased, and accuracy of channel estimation based on the reference signals is improved. Accordingly, when at least three base sequences with the same length are included in one sequence group, the network device may allocate the at least three sequences in one sequence group to different terminal devices at the same time, so that the number of terminal devices that can simultaneously transmit the reference signal and can be supported in one cell may be at least three times as large as the original number. Meanwhile, because the difference value of the root indexes of the ZC sequences generating at least three base sequences with the same length in one sequence group is redesigned, the cross correlation of the at least three base sequences in one sequence group can be ensured to be very low, so that the interference between reference signal sequences is much lower than that of signals, and the channel estimation accuracy based on the reference signal sequences can be improved compared with the prior art. In one possible design, the ith base sequence of the X base sequences satisfies the following formula:

wherein s is _i (M), M is 0,1, M-1 is the ith base sequence,

to generate a ZC sequence of the ith base sequence.

In one possible design, the method further comprises:

the network equipment sends first indication information and second indication information; the first indication information is used to indicate a group identifier of the first sequence group or a cell identifier of the first sequence group, and the second indication information is used to indicate one base sequence of the X base sequences.

In one possible design, when the group in the first sequence group is identified as u1, the value of V is V1, and when the group in the first sequence group is identified as u2, the value of V is V2, there are differences between u1 and u2, and between V1 and V2; or, when the cell identifier of the first sequence group is c1, the value of V is V1, the value of V is V1, and when the cell identifier of the first sequence group is c2, the value of V is V2, there are differences between c1 and c2, and differences between V1 and V2.

For different base sequence lengths M, the inter-sequence interference of base sequences with the same length in the first sequence group can be small. For base sequences with different lengths, if the absolute values of V all take the same value for all base sequences with different lengths, the interference between the base sequences in the first sequence group is small only under the values of some lengths M, and the interference between the base sequences in the first sequence group is large under the values of other lengths M. When the network device allocates the first sequence group to the terminal devices in the cell, the problem still occurs that the sequence interference between the terminal devices transmitting the reference signal sequences with the same length is large. Therefore, under different base sequence lengths M, the absolute value of V has different values, so that sequence interference among a plurality of terminal devices transmitting reference signal sequences of any same length in the same cell is small, and inter-sequence interference among different sequence groups is not increased.

In one possible design, the absolute value of V is any integer in the set S1 or the set S2 or the set S3 or the set S4, and the relationship between the set S1 or the set S2 or the set S3 or the set S4 and N satisfies at least one row in table 7. The contents of table 7 are specifically shown in the examples section, and are not described herein again.

wherein when X is an integer of 2 or more, | a _i 1, | not less than 2, i ═ 1, ·, X-1; orWhen X is an integer of 3 or more, | a _i |＝1，|a _j I is an integer of 1 or more and X-1 or less, j is 1, X-1 and j is not equal to i; or when X is 3, set

Or when X is 3, set

Or when X is 3, the set a is {0, a, -a }, | a | ≧ 2. Optionally, each element of the set a is a possible value of the absolute value of V.

In a fifth aspect, an embodiment of the present application provides a communication apparatus, which includes a processor coupled with a memory, wherein: the memory is used for storing instructions; the processor is configured to perform the method of the fourth aspect or any one of the possible designs of the fourth aspect, as described above, in accordance with instructions stored by the execution memory. Optionally, the communication device may further include the memory. Optionally, the communication device may further include a transceiver for supporting the communication device to perform information transmission and/or reception in the above method. Optionally, the communication device may be a network device, or may be a device in a network device, such as a chip or a chip system, where the chip system includes at least one chip, and the chip system may further include other circuit structures and/or discrete devices.

In a sixth aspect, an embodiment of the present application provides a communication apparatus, configured to implement any one of the above fourth aspect or the fourth aspect, where the communication apparatus includes corresponding functional modules, for example, a processing unit, a transceiver unit, and the like, which are respectively configured to implement the steps in the above method.

In a seventh aspect, an embodiment of the present application provides a communication method, including:

the network equipment sends second configuration information, wherein the second configuration information is used for configuring a first sequence, the first sequence is used for generating a reference signal sequence with the length of M, and M is an integer greater than 1; the network device receives the reference signal sequence from the terminal device.

By using the method provided by the embodiment of the application, in one cell, the network equipment can indicate different base sequences to different terminal equipment, so that different terminal equipment can use different base sequences to generate reference signal sequences on the same time-frequency resource, the sending period of the reference sequences can be reduced, and the problem of serious outdated channel state information is avoided.

In an eighth aspect, an embodiment of the present application provides a communication method, including:

the terminal equipment receives second configuration information from the network equipment, and generates a reference signal sequence with the length of M according to a first sequence indicated by the second configuration information, wherein M is an integer greater than 1; and the terminal equipment transmits the reference signal sequence.

In the method, different terminal devices can simultaneously use different base sequences to generate the reference signal sequence, so that the interval of sending the reference signal sequence by the terminal device can be shortened, and the problem of outdated channel state information is avoided.

In combination with the aspects or possible designs of the aspects, in one possible design, the first sequence is one of H base sequences, and H is an integer greater than 30.

With reference to the above aspects or possible designs of the aspects, in one possible design, the H-th base sequence of the H base sequences is formed by a length N and a root index N

The result of the generation of the ZC sequence of (a),

is an integer from 1 to N-1, N is an integer greater than 1, and q is an integer greater than 1 when h is different in value _h Have different values.

In combination with the aspects or possible designs of the aspects, in one possible design, the H-th base sequence of the H base sequences satisfies the following formula:

wherein s is _h (M), M is 0,1, M-1 is the h-th base sequence,

to generate a ZC sequence of the h-th base sequence.

In combination with or as shown in the previous aspects, in one possible design, the H base sequences include H ₀ Basic sequence, H ₀ Is an integer of 30 < H ₀ ≤H，H ₀ The ith base sequence in the base sequences is composed of N length and root index

The generated ZC sequence of (a) to (b),

is an integer from 1 to N-1, N is an integer greater than 1, when the values of i are different,

have different values.

In one possible implementation, H > 30,

value of (a) belongs to the set

Wherein B is a positive integer, and B is a positive integer,

is composed of

The number of the determined integer is determined,

is an integer of 0 to N-1, V is an integer, and the absolute value of V is an integer of K1 or more and N-K1 or less，K1＞1。

In another possible implementation, H > 60,

belong to a set

Wherein B is a positive integer, and B is a positive integer,

is composed of

The number of the determined integer is determined,

is an integer from 0 to N-1, the absolute value of V is 1, the absolute value of W is greater than K2 and less than N-K2, K2 > 2, or the absolute value of V and the absolute value of W are integers greater than or equal to K3 and less than or equal to N-K3, K3 > 1.

With reference to the foregoing aspects or possible designs of the foregoing aspects, in one possible design, when H ZC sequences with a first length correspond to the H base sequences, the value of V is V1, and when H ZC sequences with a second length correspond to the H base sequences, the value of V is V2; there is a difference between the first length and the second length, and an absolute value of the V1 is different from an absolute value of the V2.

In combination with or possible design in each of the above aspects, in one possible design, when H is an integer greater than 60, the V and the W satisfy the following formula:

w ═ V; or, W ═ V/2; or, W ═ 2V; or, V is an odd number, W ═ N + V)/2; or, V is an odd number, W ═ N-V)/2; alternatively, V is an odd number and W ═ N-V)/2.

In a ninth aspect, an embodiment of the present application provides a communication apparatus, including a processor coupled with a memory, wherein: the memory is used for storing instructions; the processor is configured to perform the method of any one of the possible designs of the seventh aspect or the seventh aspect described above, or any one of the possible designs of the eighth aspect or the eighth aspect, according to instructions stored by the execution memory. Optionally, the communication device may further include the memory. Optionally, the communication device may further include a transceiver for supporting the communication device to perform information transmission and/or reception in the above method. Optionally, the communication device may be a network device or a terminal device, or may be a device in a network device or a device in a terminal device, such as a chip or a chip system, where the chip system includes at least one chip, and the chip system may further include other circuit structures and/or discrete devices.

In a tenth aspect, an embodiment of the present application provides a communication apparatus, configured to implement any one of the possible designs of the seventh aspect or the seventh aspect, or a method in any one of the possible designs of the eighth aspect or the eighth aspect, where the communication apparatus includes corresponding functional modules, for example, including a processing unit, a transceiver unit, and the like, that are respectively configured to implement the steps in the foregoing method.

Embodiments of the present application provide a computer-readable storage medium, which stores computer-readable instructions, and when the computer-readable instructions are read and executed by a computer, the computer-readable instructions cause a communication device to perform the method in any one of the above possible designs.

Embodiments of the present application provide a computer program product, which when read and executed by a computer, causes the communication apparatus to perform the method of any one of the above possible designs.

The embodiment of the present application provides a chip, where the chip is connected to a memory, and is used to read and execute a software program stored in the memory, so as to implement the method in any one of the above possible designs.

An embodiment of the present application provides a communication system, including the communication device in the second aspect and the communication device in the fifth aspect.

Drawings

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

fig. 2 is a schematic structural diagram of a terminal device according to an embodiment of the present application;

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

fig. 4 is a schematic structural diagram of a network device according to an embodiment of the present application;

fig. 5 is a schematic structural diagram of a network device according to an embodiment of the present application;

fig. 6 is a flowchart illustrating a communication method according to an embodiment of the present application.

Detailed Description

Embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

The embodiments of the present application can be applied to various mobile communication systems, for example: a New Radio (NR) system, a global system for mobile communication (GSM) system, a Code Division Multiple Access (CDMA) system, a Wideband Code Division Multiple Access (WCDMA) system, a General Packet Radio Service (GPRS), a Long Term Evolution (LTE) system, an advanced long term evolution (LTE-a) system, a Universal Mobile Telecommunications System (UMTS), an evolved Long Term Evolution (LTE) system, a future communication system, and other communication systems, and is not limited herein.

In this embodiment, the terminal device may be a device having a wireless transceiving function or a chip that can be disposed in any device, and may also be referred to as a User Equipment (UE), an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a user terminal, a wireless communication device, a user agent, or a user equipment. The terminal device in the embodiment of the present application may be a mobile phone (mobile phone), a tablet computer (Pad), a computer with a wireless transceiving function, a Virtual Reality (VR) terminal, an Augmented Reality (AR) terminal, a wireless terminal in industrial control (industrial control), a wireless terminal in self driving (self driving), a wireless terminal in remote medical treatment (remote medical), a wireless terminal in smart grid (smart grid), a wireless terminal in transportation safety (transportation safety), a wireless terminal in smart city (smart city), a wireless terminal in smart home (smart home), and the like.

The network device may be an evolved node b (eNB) in an LTE system, a Base Transceiver Station (BTS) in a global system for mobile communication (GSM) system or a Code Division Multiple Access (CDMA) system, or a base station (nodeB, NB) in a Wideband Code Division Multiple Access (WCDMA) system.

In conjunction with the foregoing description, as shown in fig. 1, a flow chart of a communication method provided in the embodiment of the present application is shown. Referring to fig. 1, the method includes:

step 101: the network equipment sends configuration information, and the configuration information is used for configuring the first sequence group.

The specific implementation manner of the configuration information is not limited in this embodiment of the present application, and is not described herein again.

Step 102: the terminal device generates a reference signal sequence of length M.

Wherein M is an integer greater than 1; the reference signal sequence is generated by a base sequence with the length of M in a first sequence group allocated to the terminal equipment, the number of the base sequences with the length of M in the first sequence group is X, and the ith base sequence in the X base sequences is generated by a base sequence with the length of N and a root index of q _i Generated by ZC sequence of (q) _i Is an integer from 1 to N-1, N is an integer greater than 1, and q is an integer greater than 1 when i is different in value _i Are different in value; wherein when X is an integer of 2 or more, a root index of a first ZC sequence corresponding to a first sequence of any two base sequences of the X base sequences is q, a root index of a second ZC sequence corresponding to a second sequence of the any two base sequences is (q + V) modN, and an absolute value of V is K1 or more and N-K1 or lessInteger, K1> 1; or, when X is an integer greater than or equal to 3, the root index of the first ZC sequence is q, the root index of the second ZC sequence is (q + V) modN, the root index of the third ZC sequence generating a third sequence is (q + W) modN, the absolute value of V is 1, the absolute value of W is greater than K2 and less than N-K2, and K2 > 2, or the absolute value of V and the absolute value of W are integers greater than or equal to K3 and less than or equal to N-K3, and K3 >1, and the third sequence is any one of the X base sequences except for the first sequence and the second sequence.

In a first possible implementation manner, the base sequences in the first sequence group may be allocated to different terminal devices of a cell, that is, the base sequences in the first sequence group are used by different terminal devices in the same cell to determine the reference signal. The implementation mode has the advantages that the X base sequences included in the first sequence group provided by the invention are distributed to the terminal equipment of the same cell for use, so that the mutual interference of reference signals of different terminal equipment in the cell can be greatly reduced, and the accuracy of channel estimation is improved.

In a second possible implementation manner, the base sequences in the first sequence group may be allocated to terminal devices of different cells, for example, base sequence 1 in the first sequence group may be used for a terminal device in cell 1 to determine a reference signal, and base sequence 2 in the first sequence group may be used for a terminal device in cell 2 to determine a reference signal, where cell 1 and cell 2 are two different cells. Alternatively, base sequences in different base sequence groups may be assigned to terminal devices of the same cell. For example, X base sequences in the first sequence group are used for determining reference signals by a part of terminal devices in the cell 1, and X' base sequences in the second sequence group are used for determining reference signals by another part of terminal devices in the cell 1. In this case, the first sequence group does not correspond to a specific cell, and the network device determines which terminal devices of which cells the sequences in the first sequence group are used for determining the reference signal.

In any of the above implementations, the X base sequences in the first sequence group have the same group index. In the first implementation described above, the base sequences having the same group index belong to one base sequence group. For example, currently, 3GPP defines 30 motif group groups, and the first implementation maintains 30 motif group groups, but the number of base sequences with the same length in each motif group is increased to X >1, and the X base sequences can be allocated to terminal devices that transmit reference signals on the same time-frequency resource, rather than for a terminal device to hop sequences at different time instants. In the above-described second implementation, base sequences having the same group index belong to different group of base sequences. For example, currently 3GPP defines 30 motif sequence groups, the second implementation increases the motif sequence groups to 30 × X, the base sequences of the same length in each motif sequence group are still 1, and the network device may allocate the base sequences in different motif sequence groups to terminal devices of the same cell. At this time, it is preferable that the network device allocates base sequences having the same group index among different base sequence groups to terminal devices of the same cell.

Let u denote the group index of the first sequence group, the network device may configure u in a variety of ways. In one implementation, u may be determined from the sequence index. For example, u ═ I mod L1, i.e., u ∈ {0, 1., L1-1}, where I denotes a sequence index (sequence id) of a first sequence in the first sequence group, and a value range of I may be 0 to 1023, or 0 to 2047, or another value range, which is not limited in the embodiment of the present application. That is, the result of modulo L1 by the sequence index corresponding to the base sequence in the same sequence group is the same. L1 is a positive integer, e.g., L1 ═ 30. It should be understood that the above sequence index may be configured by the network device through terminal-specific signaling. In another implementation, u may be determined from the cell index. For example, u ═ J mod L2 is defined, that is, u ∈ {0, 1., L2-1}, where J denotes a cell index, and a value range of J may be 0 to 503, or 0 to 1023, or another value range, which is not limited in the embodiment of the present application. That is, the modulo result of the cell index pair L2 corresponding to the base sequence in the same sequence group is the same. L2 is a positive integer, e.g., L2 ═ 30. The cell index may be configured by the network device through cell-specific signaling.

It should be noted that the first sequence group may include a plurality of base sequences with different lengths. For example, the first sequence group includes X1 base sequences with length M1, and also includes X2 base sequences with length M2, and M1 is not equal to M2. The terminal device can determine the base sequence under each reference signal sequence length according to the first sequence group. Optionally, the terminal device determines the length M of the reference signal sequence by further receiving configuration information, so as to determine the X base sequences to which the terminal device is allocated under the length M.

It should be noted that the first sequence group allocated to the terminal device may be that the network device allocates the base sequences of the first sequence group to the terminal device through terminal device specific signaling (e.g., Radio Resource Control (RRC) signaling), or the network device allocates the base sequences of the first sequence group to a plurality of terminal devices in a cell served by the network device through cell-level signaling (e.g., cell-specific RRC signaling, System Information Block (SIB) signaling, Master Information Block (MIB) signaling, etc.), so as to allocate the base sequences to the terminal device. The embodiments of the present application are not limited thereto, and are not described herein again.

It should be noted that the first sequence group assigned to the terminal device is characterized in that a group of base sequences is assigned to the terminal device. Wherein the set of base sequences are sequences potentially available to the terminal device for generating reference signal sequences. Optionally, the terminal device may further determine, through other configuration information, on which base sequence the reference signal sequence transmitted at a certain time is generated.

It should be noted that, the first sequence group allocated to the terminal device does not require the terminal device to store all X base sequences of the first sequence group according to the result of allocation, but the terminal device may generate a reference signal sequence to be transmitted according to any one base sequence of the X base sequences according to a predefined rule and/or a configuration of other signaling when necessary.

Note that, the first sequence and the second sequence are arbitrary two sequences among the X base sequences, and when two sequences are arbitrarily selected as the first sequence and the second sequence among the X base sequences, if the root index of the first ZC sequence generating the first sequence is q, the root index of the second ZC sequence generating the second sequence may be written as (q + V) mod N. I.e., the root index of the ZC sequence that generates any two base sequences satisfies such a relationship.

In addition, the first ZC sequence corresponding to the first ZC sequence of any two of the X base sequences means a first ZC sequence for generating the first ZC sequence. The term "correspond" refers to the relationship of generating a base sequence from a ZC sequence. Similarly, the second ZC sequence corresponding to the second of the two arbitrary base sequences refers to a second ZC sequence that generates the second sequence. And will not be described in detail later.

Step 103: and the terminal equipment transmits the reference signal sequence.

Step 104: the network device receives the reference signal sequence, which is a base sequence in the first sequence group.

In this embodiment, a first sequence group allocated by a network device to a terminal device is determined from L sequence groups, where L is an integer greater than or equal to 2. Alternatively, L-30 or L-60. In the L sequence groups, at least one sequence group includes X base sequences with a length of M, and the number of base sequences with a length of M included in different sequence groups may be the same or different, which is not limited in this embodiment of the present application. In the at least one sequence group, X base sequences of length M are generated by ZC sequences of the same length and different root indices. For example, the ith base sequence s in the X base sequences with length M in the first sequence group _i (M), M ═ 0, 1., M-1 is defined by a length N and a root index q _i ZC sequence of

The specific generation formula is as follows:

wherein j is ² ＝-1。

Optionally, in this embodiment of the present application, the L sequence groups have different sequence group identifiers or cell identifiers. The terminal equipment acquires the sequence group identification or the cell identification of the first sequence group by receiving the first indication information. According to the group identifier or the cell identifier of the first sequence group, the terminal device may determine a group of base sequences allocated to the terminal device, where the group of base sequences may include a plurality of base sequences of length, and the number of base sequences of length M is X. Optionally, the terminal device may substitute the group identifier or the cell identifier according to a generation formula of the reference signal sequence to obtain a group of base sequences allocated to the terminal device, or obtain the reference signal sequence. Or the terminal equipment obtains a group of base sequences distributed to the terminal equipment according to a predefined table and the first indication information. For example, the predefined table defines one or more base sequences included in each sequence group, and the terminal device knows the X base sequences through the first indication information. Or, the predefined table defines a root index of a ZC sequence included in each sequence group that generates one or more base sequences of the sequence group, and the terminal device knows the root index of the ZC sequence that generates the X base sequences through the first indication information.

It should be understood that, if the base sequences in the same sequence group are only allocated to the terminal equipment in the same cell, the group identifier may be determined according to the cell identifier. The terminal device may obtain the group identifier and may also obtain the cell identifier. If the base sequences in the same sequence group can be allocated to different cell terminal devices, the group identifier is not equal to the cell identifier, and the terminal devices need to acquire the sequence identifier or the group identifier to determine to generate the ZC sequence root index of the X base sequences.

Optionally, a ZC sequence root indicator q of the ith base sequence of the X base sequences is generated _i Satisfies the following conditions:

q _i ＝(f(u)+V)mod N or q _i ＝(f(u)-V)mod N，(2)

Where u is a group identity or cell identity of the first sequence group, f (u) is an integer determined according to u, V is an element in a set S, the set S comprises only X different elements V ₁ ，V ₂ ...，V _X . The network device notifies the value of u through the first signaling, that is, X base sequences are allocated to the terminal device. Optionally, when u has different values, the elements included in the set S may be different.

Optionally, in this embodiment of the application, the terminal device further obtains the reference signal sequence by receiving second indication information. According to the first indication information, the terminal equipment is allocated with the X base sequences. Further, according to the second indication information, the terminal device determines a base sequence from the X base sequences to generate the reference signal sequence. Wherein the parameter α used by the base sequence to generate the reference signal sequence may be further signaled by the network device through other signaling. For example, when the terminal device generates the reference signal sequence, the root index of the ZC sequence that generates the base sequence of the reference signal sequence is characterized by a first parameter determined according to the sequence group identifier or the cell identifier indicated by the first indication information, and a second parameter determined according to the second indication information, the second parameter belonging to a set including only X elements. For example, in the above formula (2), the value of V may be determined according to the second indication information. For another example, the second indication information indicates, among the X base sequences in the first sequence group, an identifier of a base sequence that generates the reference signal sequence or an identifier of a root indicator of a ZC sequence that generates the base sequence. For example, the above-mentioned predefined table defines root indices of ZC sequences included in each sequence group that generate one or more base sequences of the sequence group, and the terminal device determines the X root indices through the first indication information and determines the root indices for generating the reference signal sequences through the second indication information.

The first indication information and the second indication information may be sent by the same instruction, or may be sent by different instructions, which is not limited in this embodiment of the present application.

With reference to the above description, in this embodiment, the terminal device obtains the reference signal sequence according to the first indication information and the second indication information. The first indication information is used to indicate a group identifier of the first sequence group or a cell identifier of the first sequence group, and the second indication information is used to indicate one base sequence of the X base sequences.

Optionally, the root indicator q of the ZC sequence that generates the base sequence of the reference signal sequence satisfies the following formula:

wherein B is an integer greater than 1, for example B may be 31 or 71; u is a natural number determined from a group id or a cell id of the first sequence group, for example, u is a group id of the first sequence group or a cell id of the first sequence group. Delta is an integer determined according to the second indication information, or an integer determined according to the first indication information and the second indication information,

indicating a lower rounding. For example, the second indication information indicates a sequence identifier of one base sequence of the X base sequences in the first sequence group or an identifier of a root indicator of a ZC sequence that generates the base sequence, and the terminal device determines the parameter Δ according to the sequence identifier or the root indicator identifier, for example, the sequence identifier sequentially corresponds to values of the parameter Δ from small to large. Or the second indication information indicates one value from X values of the parameter V, X is greater than 1, and Δ and V have a predefined relationship. Optionally, X values of V include 0. Alternatively, Δ may be determined from V by any of the following equations:

1)Δ＝V；

2)Δ＝-V；

3)Δ＝V×(-1) ^f(u，N)

4)Δ＝-V×(-1) ^f(u，N) ；

where f (u, N) is an integer determined from u and N. Alternatively to this, the first and second parts may,

or f (u, N) takes other forms, and the embodiments of the present application are not limited.

Further, for example, in conjunction with the above formula, the root index q may satisfy any of the following formulas:

1)

2)

3)

4)

of course, the above is only an example, and q and Δ may also be determined in other ways, which are not described herein again.

Optionally, a root indicator q of a ZC sequence of an ith base sequence of the X base sequences _i At least one of the following is satisfied:

b is an integer greater than 1, u is an integer determined according to a group identity of the first sequence group or a cell identity of the first sequence group, v is _i Is set A ═ 0, a ₁ ，...，a _X-1 Element in (b), a _i Is an integer; wherein when X is an integer of 2 or more, | a _i 1, | not less than 2, i ═ 1, ·, X-1; or, | a when X is an integer of 3 or more _i |＝1，|a _j I is an integer of 1 or more and X-1 or less, j is 1, X-1 and j is not equal to i; or when X is 3, set

Or when X is 3, set

Or when X is 3, the set a is {0, -a, a }, | a | ≧ 2. Optionally, each element of the set a is a possible value of the absolute value of V.

It should be noted that, since the base sequence of each of the 2 sequence groups is generated from a ZC sequence and the root indicators of ZC sequences generating different base sequences are different, it can be considered that each base sequence corresponds to the root indicator of one ZC sequence. Therefore, the root index group may be equivalently defined, that is, root indexes of ZC sequences corresponding to base sequences of the same sequence group belong to the same root index group, or base sequences corresponding to root indexes of the same root index group belong to the same sequence group. Thus, the L sequence sets correspond to L root index sets, each root index set comprising one or more root indices. Then, the first sequence group corresponds to a first root index group, and the number of root indexes of the ZC sequence in the first root index group used for generating the base sequence of length M is X. The first root index group may include root indexes of ZC sequences that generate base sequences of different lengths. Optionally, the L root index groups have different root index group identities, or cell identities.

Therefore, for convenience of description, in the embodiment of the present application, the group identifier of the sequence group in which each base sequence is located, and the group identifier of the root index group in which the root index corresponding to the base sequence is located are defined equivalently. For this reason, in the embodiment of the present application, the group identifier of the first sequence group may refer to a group identifier of the first sequence group in the at least two sequence groups, or may refer to a group identifier of a root index corresponding to any base sequence in the first sequence group in the at least two root index groups. Further, the second indication information may be a sequence identifier of a base sequence generating the reference signal sequence in the first sequence group, or a root indicator identifier of a root indicator corresponding to the base sequence generating the reference signal sequence in a first root indicator group, and is used to obtain the base sequence generating the reference signal sequence from X base sequences in the first sequence group, or determine a root indicator of a ZC sequence generating the base sequence generating the reference signal sequence from X root indicators in the first root indicator group, so as to determine the base sequence generating the reference signal sequence.

In this embodiment of the application, when the number X of base sequences with a length of M in the first sequence group is different, the root indicator of the ZC sequence generating the X base sequences may have different characteristics, which will be described below.

In a first possible scenario, the first sequence group includes 2 sequences.

In this scenario, when the length of the first ZC sequence and the length of the second ZC sequence are both first lengths, the value of V is V1, and when the length of the first ZC sequence and the length of the second ZC sequence are both second lengths, the value of V is V2; there is the first length different from the second length, and the absolute value of V1 is different from the absolute value of V2, i.e., there is N1 ≠ N2, such that the absolute value of V1 ≠ V2, N1 is the first length, and N2 is the second length.

This has the advantage that inter-sequence interference of base sequences of the same length located in the first sequence group can be made small for different base sequence lengths M. For base sequences with different lengths, if the absolute values of V all take the same value for all base sequences with different lengths, the interference between the base sequences in the first sequence group is small only under the values of some lengths M, and the interference between the base sequences in the first sequence group is large under the values of other lengths M. When the network device allocates the first sequence group to the terminal devices in the cell, the problem still occurs that the sequence interference between the terminal devices transmitting the reference signal sequences with the same length is large. Therefore, under different base sequence lengths M, the absolute value of V has different values, so that sequence interference among a plurality of terminal devices transmitting reference signal sequences of any same length in the same cell is small, and inter-sequence interference among different sequence groups is not increased.

When the base sequences in the same sequence group are distributed to the terminal equipment of the same cell, the number of the terminal equipment which can simultaneously send the reference signals with the same length in each cell is at least 2 times of the original number, the interference power between the reference signal sequences generated by any two base sequences with the same length in the same sequence group can be ensured to be very low while the number of the reference signal sequences is increased, the interference between the reference signal sequences is much lower than that of signals, the flexible network planning is facilitated, and the channel measurement accuracy of the network equipment based on the reference signal sequences is improved.

When the base sequences in the same sequence group are allocated to terminal devices of the same or different cells, the entire network has at least 60 base sequences for flexible scheduling, for example, for a cell with a small number of terminal devices, 1 base sequence may be allocated, and for a cell with a large number of terminal devices, multiple base sequences may be allocated. In this case, one possible implementation is to allocate base sequences in the same sequence group to different terminal devices in the same cell as much as possible, and in a cell with a large number of terminal devices, base sequences in a plurality of sequence groups may be allocated to terminal devices in the cell.

Optionally, when the length of the first ZC sequence is N, N exists such that the absolute value of V is greater than 3.

The method has the advantages that in the base sequences with larger lengths in the first sequence group, the interference among the base sequences with the same length is small, and the sequence interference among a plurality of terminal devices which transmit the reference signal sequences with larger lengths in the same cell can be small.

Optionally, when both the length of the first ZC sequence and the length of the second ZC sequence are first lengths, the value of V is V1, and when both the length of the first ZC sequence and the length of the second ZC sequence are second lengths, the value of V is V2; there is a first length greater than the second length such that the absolute value of V1 is greater than the absolute value of V2, i.e., there is N1 > N2 such that the absolute value of V1 > the absolute value of V2, N1 is the first length, and N2 is the second length.

This has the advantage that inter-sequence interference of base sequences of the same length located in the first sequence group can be made small for different base sequence lengths M. For base sequences with different lengths, if the absolute values of V are the same for all base sequences with different lengths, the interference between the base sequences in the first sequence group is small only under the values of some lengths M, and the interference between the base sequences in the first sequence group is large under the values of other lengths M (especially, large M). When the network device allocates the first sequence group to the terminal devices in the cell, the problem still occurs that the sequence interference between the terminal devices transmitting the reference signal sequences with the same length is large. Therefore, under different base sequence lengths M, the absolute value of V has different values, so that sequence interference among multiple terminal devices transmitting reference signal sequences of any same length in the same cell is small.

Optionally, when the group identifier of the first sequence group is u1, the value of V is V1, and when the group identifier of the first sequence group is u2, the value of V is V2, where u1 is different from u2, and V1 is different from V2. I.e. the value of V, is related to the group identity of the first sequence group.

This has the advantage that, even for larger values of L, the root index of the ZC sequence generating the base sequence of the ordered group is not repeated, while at the same time the root index of the ZC sequence generating the base sequence of the ordered group is not repeatedFor each base sequence length M, the number of base sequences with length M included in each sequence group in L sequence groups is as large as possible, which is helpful for supporting more terminal devices in the same cell to transmit reference signal sequences on the same time-frequency resource and ensures that inter-sequence interference is small. For example, the formula for determining q is as described above

In (1), let the root index of the first ZC sequence be

Then if the formula Δ ═ V × (-1) ^f(u，N) Or Δ ═ Vx (-1) ^f(u，N) To determine a root indicator of said second ZC sequence, then Δ is related to a group identity u. Under certain group identifications, Δ ═ V, and under certain other group identifications, Δ ═ V. For another example, for a length N of a ZC sequence, there may be K values V of V ₁ ，V ₂ ，...，V _K So as to be based on the root index q ₁ And (q) ₁ +V _k ) mod N generates sufficiently low inter-sequence interference for 2 base sequences of the first sequence group, where K is an integer greater than 1,

i. j and K are integers of 1 or more and K or less, and i and j are different.

Represents the absolute value of V, i.e., if V ≧ 0,

if V is less than 0, the first step is,

at this time, there may be a case where only the value V of any one of V is adopted _i Then, no L groups of base sequences can be found, each sequence group is satisfied to include 2 base sequences, and root indexes of ZC sequences generating L groups of base sequences are not repeated, especially L is comparedWhen large, L is 30, for example. This will cause terminal devices in different cells to generate reference signal sequences of the same length based on the same base sequence, thereby causing large inter-cell reference signal sequence interference. At this time, within some sequence groups, a certain V is adopted _i To design the sequence of the group, and in some other sequence groups, another V is used _j The sequence of the group is designed, so that the root index of the ZC sequence generating the L group of sequences is not repeated, and the terminal equipment in the adjacent region is prevented from bringing large reference signal sequence interference.

Optionally, when the group identifier of the first sequence group is u1, the value of V is V1, and when the group identifier of the first sequence group is u2, the value of V is V2, which satisfies that u2 is not equal to any u1, and V1 is the same as V2, that is, the value of V is independent of the group identifier of the first sequence group.

Optionally, when the cell identifier of the first sequence group is c1, the value of V is V1, and when the cell identifier of the first sequence group is c2, the value of V is V2, where c1 is different from c2, and V1 is different from V2, that is, the value of V is related to the cell identifier of the first sequence group.

In this scenario, if the root indexes of two ZC sequences that generate any two base sequences are q and (q + V) mod N, respectively, then there may be a correlation between V and the length N of the ZC sequence. For convenience of description, X sequence numbers in the first sequence group are taken as examples for description, and other cases are not described again.

In a first possible implementation manner, for a first sequence and a second sequence of the X base sequences, if a root index of a first ZC sequence generated for the first sequence is q and a root index of a second ZC sequence generated for the second sequence is (q + V) mod N, an absolute value of V is N

Is an integer from set A1 or set A2 or set A3 or set A4, i.e.

Or

The relationship of set A1 or set A2 or set A3 or set A4 to N satisfies at least one row in Table 2 below. Optionally, in one of the following four formulas, at least one formula may exist for determining the root index q of the first ZC sequence ₁ And a root index q of said second ZC sequence ₂ ：

Wherein i is 1, 2, v ₁ ＝0，

u is a group identity or a cell identity of the first sequence group, B is an integer greater than 1, e.g., B ═ 31.

TABLE 2

For example, when N is 113, V ═ 3 is an integer in the set a2 or A3. When N is 191, V is 5 and is an integer from the set a2 or A3.

The method has the advantages that the method can optimize the sequence cross correlation of different truncation lengths, ensures that the cross correlation between the base sequences of the same sequence group is very low under the truncation lengths, namely the interference between the sequences is very low, and simultaneously does not increase the interference between the base sequences of different sequence groups. When receiving the reference signal sequence sent by the terminal device, the network device may perform subsequent processing, such as channel estimation, based on the truncated sequence of the reference signal sequence to match the coherence bandwidth of the channel. Optionally, the sets a1 to a4 may correspond to different truncation lengths, for example, the truncation length corresponding to the set a1 is 24, the truncation length corresponding to the set a2 is 30, the truncation length corresponding to the set A3 is 36, and the truncation length corresponding to the set a4 is 72. Of course, the above is only an example, and the sets a1 to a4 may also correspond to other truncation lengths, and are not described herein again. The truncation lengths commonly used by an actual system are considered, for example, 24, 30, 36 and the like, and it can be ensured that base sequences located in the same sequence group still have small inter-sequence interference under the truncation lengths used by the actual system, and inter-sequence interference of different sequence groups is not increased.

For example, the network device L assigns a first sequence group to the terminal device among 30 sequence groups, where each sequence group includes two base sequences. N is 139, according to table 2, V ═ 4. At this time, among the 30 sets of sequences, the relationship between the root index of the ZC sequence generating each set of two base sequences and the set identifier u may be as shown in table 3-1.

TABLE 3-1

u	0	1	2	3	4	5	6	7	8	9	10	11	12	13	14
																q ₁	4	9	13	18	22	27	31	36	40	45	49	54	58	63	67
q ₂	8	5	17	14	26	23	35	32	44	41	53	50	62	59	71
																u	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29
q ₁	72	76	81	85	90	94	99	103	108	112	117	121	126	130	135
																q ₂	68	80	77	79	86	98	95	107	104	116	113	125	122	134	131

In Table 3-1, there are 30 root indexes, each including two root indexes, q ₁ And q is ₂ . Two root indices of the ith group of root indices are root indices of ZC sequences that generate two base sequences of the ith motif group. u is a sequence group identifier or a group identifier of a root index group, and as described above, the group identifier of the first sequence group may be the same as the group identifier of the root index group corresponding to the base sequence in the first sequence group.

For another example, when N is 113 and V is 3, the relationship between the root index of the ZC sequence generating each of the two base sequences and the group id u in 30 groups of sequences may be as shown in table 3-2.

TABLE 3-2

u	0	1	2	3	4	5	6	7	8	9	10	11	12	13	14
																q ₁	4	7	11	15	18	22	26	29	33	36	40	44	47	51	55
q ₂	1	10	8	12	21	19	23	32	30	39	43	41	50	54	52
																u	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29
q ₁	58	62	66	69	73	77	80	84	87	91	95	98	102	106	109
																q ₂	61	59	63	72	70	74	83	81	90	94	92	101	105	103	112

In a second possible implementation manner, for a first sequence and a second sequence of the X base sequences, if a root indicator of a first ZC sequence generating the first sequence is q and a root indicator of a second ZC sequence generating the second sequence is (q + V) mod N, then an absolute value of V is N

Is an integer from set a1 or set a2 or set A3, the relationship of set a1 or set a2 or set A3 to N satisfying at least one row in table 4 below. Alternatively, the root indicator q of the first ZC sequence may be determined according to the following formula ₁ And a root indicator q of said second ZC sequence ₂ ：

Wherein i is 1, 2, v ₁ ＝0，

u is a group identity or a cell identity of the first sequence group, B is an integer greater than 1, for example, B ═ 31.

TABLE 4

The implementation mode has the beneficial effects that the V can be determined by taking the cross correlation of two truncation length sequences as a joint optimization target, so that the frequency selection characteristic of a channel is better matched. For example, the truncated lengths of set S1 are 24 and 30, the truncated lengths of set S2 are 30 and 36, and the truncated lengths of set S3 are 36 and 72 in table 4. Then the number of the set S1 is used as the value of V, so that the truncated cross-correlation of the base sequences in the same sequence group is very small at both the truncation lengths of 30 and 36, and the cross-correlation between sequences in different sequence groups is not increased. Of course, the above is only an example, and the sets S1 to S3 may also correspond to other truncation lengths, and are not described herein again.

In a third possible implementation, the absolute value of V is

Is L1 or L2 or L3 or L4. The relationship of L1 or L2 or L3 or L4 to N satisfies at least one row in table 5 below. In this implementation, given a length M of a reference signal sequence, a value of N may be determined, which is determined according to table 5

A root index q of the first ZC sequence and the second ZC sequence ₁ And q is ₂ Determined by the following formula:

wherein i is 1, 2, v ₁ ＝0，

Optionally, values of L1, L2, L3, and L4 may be designed for different cutoff lengths, for example, the cutoff length corresponding to the range L1 is 24, the cutoff length corresponding to the range L2 is 30, the cutoff length corresponding to the range L3 is 36, and the cutoff length corresponding to the range L4 is 72. Of course, the above are only examples, and L1 to L4 may also correspond to other truncation lengths, which are not described herein again. The beneficial effects are as described above, and are not described in detail.

TABLE 5

In a fourth possible implementation, the absolute value of V is

The relationship with N satisfies at least one row in table 6 below. In this implementation, given a length M of a reference signal sequence, a value of N may be determined, which is determined according to table 6

wherein i is 1, 2, v ₁ ＝0，

TABLE 6

By the method provided by the embodiment of the application, when two base sequences are included in one sequence group, the absolute value of V is greater than 1, and especially when the length N of a ZC sequence is large, the absolute value of V is larger. N is present, such that the absolute value of V is greater than 2. In this scenario, when any of the first to fourth implementation manners is satisfied, the network device may allocate two base sequences with the same length in one sequence group to different terminal devices at the same time, so that the number of reference signal sequences that can be allocated by one network device becomes 2 times that of the original reference signal sequences, interference between the reference signal sequences is not increased while the number of the reference signal sequences is increased, and accuracy of channel estimation based on the reference signals is improved. For example, in the fourth implementation, when N is 139, if v is adopted ₁ 0 and v ₂ If the root index of two ZC sequences is obtained as 1, the cross-correlation between two base sequences obtained from the two ZC sequences at the truncation length of 30 is as high as 8.7dB, which is equivalent to introducing 8.7dB interference; if the table 6 is adopted, let v ₁ 0 and v ₂ If the root index of two ZC sequences is obtained 4, the cross-correlation between two base sequences obtained from the two ZC sequences at the truncation length of 30 is only 2.7dB, which greatly reduces inter-sequence interference in the same sequence group without increasing inter-sequence interference in different sequence groups. In addition, the method provided by the embodiment of the application provides corresponding values of the absolute value of V for different N values, and can ensure that the cross correlation of the base sequence is very low under various M values. For example, N571, like N113, with V3, results in 2 base sequences with cross-correlation of up to 9dB at truncation length 30; with the recommended V16, the cross-correlation can be made to be only 2.8 dB. Therefore, the method provided by the embodiment of the application can ensure that the cross correlation of the base sequence is very low under various M values.

A second possible scenario includes at least 3 sequences in each sequence group. For convenience of description, the following description will be given by taking 3 sequences in each sequence group as an example, and other cases may refer to the description herein and will not be described herein again.

In this scenario, for any three sequences in the first sequence group, the first sequence, the second sequence, and the third sequence, a root indicator q of the first ZC sequence of the first sequence is generated ₁ Q, the root index of the second ZC sequence generating the second sequence is q ₂ (q + V) mod N, and the root index of the third ZC sequence generating the third sequence is q ₃ Mod N, (q + W), V and W are integers.

Optionally, when both the length of the first ZC sequence and the length of the second ZC sequence are first lengths, the value of V is V1, and when both the length of the first ZC sequence and the length of the second ZC sequence are second lengths, the value of V is V2; there is the first length different from the second length and the absolute value of V1 different from the absolute value of V2, i.e. there is N1 ≠ N2, such that the absolute value of V1 ≠ V2, N1 is the first length and N2 is the second length.

This has the advantage that inter-sequence interference of base sequences of the same length located in the first sequence group can be made small for different base sequence lengths M. For base sequences with different lengths, for all base sequences with different lengths, if the absolute value of V results in that only a few length M values are taken, the interference between the base sequences in the first sequence group is small, and the interference between the base sequences in the first sequence group is large under the other length M values. When the network device allocates the first sequence group to the terminal devices in the cell, the problem still occurs that the sequence interference between the terminal devices transmitting the reference signal sequences with the same length is large. Therefore, under different base sequence lengths M, the absolute value of V has different values, so that sequence interference among a plurality of terminal devices transmitting reference signal sequences of any same length in the same cell is small, and interference among reference signals of different cells is not increased.

When the base sequences in the same sequence group are allocated to the terminal equipment of the same cell, the number of the terminal equipment capable of simultaneously sending the reference signals with the same length in each cell is at least 3 times of the original number, the interference power among the reference signal sequences generated by the base sequences with at least three same lengths in one sequence group can be ensured to be very low while the number of the reference signal sequences is increased, the interference among the reference signal sequences is greatly lower than that of signals, the flexible network planning is facilitated, and the channel measurement accuracy of the network equipment based on the reference signal sequences is improved.

When the base sequences in the same sequence group are allocated to terminal devices of the same or different cells, the entire network has at least 90 base sequences for flexible scheduling, for example, for a cell with a small number of terminal devices, 1 base sequence may be allocated, and for a cell with a large number of terminal devices, a plurality of base sequences may be allocated. In this case, one possible implementation manner is to allocate base sequences in the same sequence group to different terminal apparatuses in the same cell as much as possible, and in a cell with a large number of terminal apparatuses, base sequences in multiple sequence groups may be allocated to terminal apparatuses in the cell.

Optionally, when the length of the first ZC sequence is N, the root indicator of the first ZC sequence is q, the root indicator of the second ZC sequence is (q + V) mod N, and N exists so that an absolute value of V is greater than 3.

This has the advantage that inter-sequence interference of base sequences of the same length located in the first sequence group can be small for different base sequence lengths M. For base sequences with different lengths, if the absolute values of V all take the same value for all base sequences with different lengths, the interference between the base sequences in the first sequence group is small only under the values of some lengths M, and the interference between the base sequences in the first sequence group is large under the values of other lengths M. When the network device allocates the first sequence group to the terminal devices in the cell, the problem still occurs that the sequence interference between the terminal devices transmitting the reference signal sequences with the same length is large. Therefore, under different base sequence lengths M, the absolute value of V has different values, so that sequence interference among a plurality of terminal devices transmitting reference signal sequences of any same length in the same cell is small, and inter-sequence interference among different sequence groups is not increased.

Optionally, when the group identifier of the first sequence group is u1, the value of V is V1, and when the group identifier of the first sequence group is u2, the value of V is V2, where u1 is different from u2, and V1 is different from V2, that is, the value of V is related to the group identifier of the first sequence group.

The method has the advantages that even if a larger value of L is taken, the root index of the ZC sequence generating the base sequences of the ordered sequence groups is not repeated, and meanwhile, the number of the base sequences with the length of M in each base sequence group is as large as possible according to the length of M of each base sequence, so that the method is beneficial to supporting more terminal devices to send reference signal sequences on the same time-frequency resource in the same cell and ensuring that the interference among the sequences is small. For example, the formula for determining q is described above

If the formula is changed from Δ ═ V × (-1) ^f(u，N) Or Δ ═ V × (-1) ^f(u，N) To determine Δ from V, the value of Δ is related to the group identity u. Under certain group designations, Δ ═ V, and under certain other group designations, Δ ═ V. For another example, for a length N of a ZC sequence, there may be K values V of V ₁ ，V ₂ ，...，V _K Based on the root index q ₁ And (q) ₁ +V _k ) mod N generates sufficiently low inter-sequence interference for 2 base sequences of the first sequence group, where K is an integer greater than 1,

i. j and K are integers of 1 or more and K or less, and i and j are different,

indicating taking the absolute value of Y. At this time, there may be a case when only any one of V is employed _i When L groups of base sequences cannot be found, it is satisfied that each sequence group includes 2 base sequences, and the root index of the ZC sequence generating the L groups of base sequences is not repeated, especially when L is large, for example, L ═ 30. This will result in that terminal devices in different cells may generate reference signal sequences of the same length based on the same base sequence, thereby causing large inter-cell reference signal sequence interference. At this time, in some orderWithin the column group, a certain V is adopted _i To design the sequence of the group, and in some other sequence groups, another V is used _j The sequence of the group is designed, so that the root index of the ZC sequence generating the L group of sequences is not repeated, and the terminal equipment of the adjacent region is prevented from bringing large reference signal sequence interference.

Optionally, when the group identifier of the first sequence group is u1, the value of V is V1, and when the group identifier of the first sequence group is u2, the value of V is V2, and for any u1 different from u2, V1 is the same as V2, that is, the value of V is independent of the group identifier of the first sequence group.

In this scenario, V, W and N may have various associations, as described in detail below.

Optionally, in this scenario, W is determined according to V, or V is determined according to W. Optionally, V and W satisfy any one of the following formulas:

w ═ V; or V is an even number, and W is V/2; or, W ═ 2V; or, V is an odd number, W ═ N + V)/2; or, V is an odd number, W ═ N-V)/2; alternatively, V is an odd number and W ═ N-V)/2.

Alternatively, V and W may be independently designed values, without explicit direct determination of each other.

In a first possible implementation, the absolute value of V is

(i.e. the

Or

) As set S1 or setS2 or set S3 or set S4, the relationship between set S1 or set S2 or set S3 or set S4 and N satisfying at least one row in table 7 below. Optionally, in this implementation manner, the root indicator q of the first ZC sequence ₁ And a root index q of the second ZC sequence ₂ And a root indicator q of the third ZC sequence ₃ Determined according to the following formula (4-1) or (4-2):

wherein i is 1, 2, 3, v ₁ ＝0，

u is a group identity or a cell identity of the first sequence group, B is an integer greater than 1, e.g., B ═ 31. At this time, the relationship between W and V is:

note that since (q + W) modN is equal to (q + W + N) modN, when V < 0, W may also be written as W ═ N- (N-V)/2 ═ N + V)/2, that is, the relationship between W and V is collectively written as:

W＝(N+V)/2 (4-4)。

therefore, at this time, the relation between W and V may be either (4-3) or (4-4), and the root indices of the first ZC sequence and the second ZC sequence obtained by using both are the same.

Alternatively, in this implementation, the root index q of the first ZC sequence is ₁ And a root index q of the second ZC sequence ₂ And a root indicator q of the third ZC sequence ₃ Determined according to the following formula (4-5) or (4-6):

wherein the content of the first and second substances,

optionally, order

v ₃ When q is equal to 0, the compound can be obtained ₁ ，q ₂ ，q ₃ . u is a group identity or a cell identity of the first sequence group, B is an integer greater than 1, e.g., B ═ 31. In this case, W and V have a relationship of (N-V)/2. Optionally, let v ₁ ＝0，

At this time, q is ₂ ＝(q ₁ +V’)modN，q ₃ ＝(q ₁ +W’)modN，

W ═ N-V'. The values of V 'and W' still satisfy the characteristics of V and W stated in step 102, i.e. the absolute value of V 'and the absolute value of W' are integers greater than or equal to K3 and less than or equal to N-K3, and K3 > 1. In this case, the relationship between V' and N can be obtained from the relationship between the absolute value of V and N in table 7. Therefore, no matter which v is used _i Determines q by the value sequence of ₁ 、q ₂ 、q ₃ The obtained sets of the three root indexes are all consistent, and the cross-correlation performance of the three base sequences in the same sequence group is also consistent.

TABLE 7

The implementation mode has the advantages that the V and/or the W can be determined aiming at the cross correlation of sequences with different truncation lengths as an optimization target, the coherent bandwidth of a channel is matched, the inter-sequence interference among different sequence groups is not increased under the typical channel coherent bandwidth, and meanwhile, the inter-sequence interference in one sequence group is low. The sets S1 through S4 in table 7 may correspond to different truncation lengths, for example, the set S1 corresponds to a truncation length of 24, the set S2 corresponds to a truncation length of 30, the set S3 corresponds to a truncation length of 36, and the set S4 corresponds to a truncation length of 72. Of course, the above is only an example, and the sets S1 to S4 may also correspond to other truncation lengths, and are not described herein again.

In a second possible implementation, the absolute value of V is

The relationship between L1, L2, L3, or L4 and N is L1, L2, L3, or L4, which satisfies at least one row in the following Table 8. At this time, optionally, in this implementation, the root indicator q of the first ZC sequence ₁ And a root indicator q of the second ZC sequence ₂ And a root indicator q of the third ZC sequence ₃ Determined according to the following formula (5-1) or (5-2):

wherein the content of the first and second substances,

optionally, let v ₁ ＝0，

u is a group identity or a cell identity of the first sequence group, B is an integer greater than 1, e.g., B ═ 31. At this time, similar to the analysis in the first possible implementation, the relationship of W and V is

Or equivalently, the relationship of W and V is written uniformly as:

W＝(N+V)/2。

the root index of the first ZC sequence and the second ZC sequence obtained using both is the same.

Alternatively, in this implementation, the root indicator q of the first ZC sequence ₁ And a root indicator q of the second ZC sequence ₂ And a root indicator q of the third ZC sequence ₃ Determined according to the following formula (5-3) or (5-4):

wherein, the first and the second end of the pipe are connected with each other,

optionally, make

v ₃ When q is 0, q is obtained ₁ ，q ₂ ，q ₃ . u is a group identity or a cell identity of the first sequence group, B is an integer greater than 1, e.g., B ═ 31. In this case, W and V have a relationship of (N-V)/2. Optionally, let v ₁ ＝0，

At this time, q is ₂ ＝(q ₁ +V’)modN，q ₃ ＝(q ₁ +W’)modN，

W ═ N-V'. In this case, the relationship between V' and N can be obtained from the relationship between the absolute value of V and N in table 7. Therefore, no matter which v is used _i Determines q by the value sequence of ₁ 、q ₂ 、q ₃ The obtained sets of the three root indexes are all consistent, and the cross correlation performance of the three base sequences in the same sequence group is also consistent.

TABLE 8

N	L1	L2	L3	L4
					97	71	71	95	1
113	35	35	107	1
					139	127	91	3	135
167	7	31	159	163
					191	9	125	5	57
211	9	199	5	3
					107	99	99	47	1
239	9	9	5	3
					283	11	7	7	3
311	13	11	9	303
					359	15	13	9	5
383	15	11	11	5
					431	19	15	11	5
449	19	13	13	5
					479	21	17	13	7
523	21	15	15	7
					571	25	17	15	7
619	27	21	17	7
					661	29	23	17	9
719	31	25	19	9
					761	33	23	21	9
787	33	27	21	11
					811	35	25	23	11
863	37	29	23	11
					911	39	31	25	11
953	41	29	25	13
					997	43	31	27	13
1051	45	35	29	13
					1103	47	37	29	15
1151	49	39	31	15
					1237	53	41	33	17
1291	55	43	35	17
					1327	57	45	35	17
1439	61	49	39	19
					1531	65	51	41	21
1583	69	49	43	21
					1627	71	55	45	21

The implementation method has the advantages that the V and/or the W can be determined aiming at the cross correlation of sequences with different truncation lengths as an optimization target, the coherence bandwidth of a channel is matched better, the cross correlation between base sequences in the same sequence group is ensured to be very low under a certain truncation length, namely, the inter-sequence interference is very low, and meanwhile, the interference between the base sequences in different sequence groups is not increased. L1 to L4 in table 8 may correspond to different cut lengths, for example, L1 corresponds to a cut length of 24, L2 corresponds to a cut length of 30, L3 corresponds to a cut length of 36, and L4 corresponds to a cut length of 72. Of course, the above is only an example, and L1 to L4 may also correspond to other truncation lengths, and are not described herein again.

In a third possible implementation manner, the absolute value of V is set S1 or set S2 or set S3 or set S4, and the relationship between set S1 or set S2 or set S3 or set S4 and N satisfies at least one row in table 9 below. At this time, optionally, at least one formula exists among the following four formulas that may be used to determine the root index q of the first ZC sequence ₁ And a root indicator q of the second ZC sequence ₂ And a root indicator q of the third ZC sequence ₃ ：

Wherein the content of the first and second substances,

optionally, let v ₁ ＝0，

u is a group identity or a cell identity of the first sequence group, B is an integer greater than 1, e.g., B ═ 31. At this time, similar to the analysis in the first possible implementation, the relationship of W and V is:

or equivalently, the relationship of W and V is written uniformly as:

W＝(N+V)/2

TABLE 9

The implementation mode has the advantages that the cross correlation of sequences with different truncation lengths can be optimized, the cross correlation between base sequences of the same sequence group is low under the truncation lengths, namely, the inter-sequence interference is low, and meanwhile, the interference between the base sequences of different sequence groups is not increased. The sets S1 through S4 in table 9 may correspond to different truncation lengths, for example, the truncation length corresponding to the set S1 is 24, the truncation length corresponding to the set S2 is 30, the truncation length corresponding to the set S3 is 36, and the truncation length corresponding to the set S4 is 72. Of course, the above are only examples, and the set S1 to the set S4 may also correspond to other truncation lengths, which are not described herein again.

In a fourth possible implementation manner, the absolute value of V is set S1 or S2 or S3, and the relationship between the set S1 or S2 or S3 and N satisfies at least one row in table 10 below. At this time, optionally, in this implementation, the root indicator q of the first ZC sequence ₁ And a root indicator q of the second ZC sequence ₂ And a root indicator q of the third ZC sequence ₃ Can be determined according to the following formula:

wherein the content of the first and second substances,

optionally, let v ₁ ＝0，

u is a group identity or a cell identity of the first sequence group, B is an integer greater than 1, for example, B ═ 31. At this time, similar to the analysis in the first possible implementation, the relationship of W and V is:

or equivalently, the relationship of W and V is written uniformly as:

W＝(N+V)/2

Watch 10

The implementation mode has the advantages that the V and/or the W can be determined aiming at the cross correlation of at least two truncation length sequences as an optimization target, so that the cross correlation between the base sequences of the same sequence group is very low under the two truncation lengths, namely, the inter-sequence interference is very low, and meanwhile, the interference between the base sequences of different sequence groups is not increased. For example, using the one in set S1

To determine V, the sequence cross-correlation at both truncation lengths 24 and 30 can be made low. Using ones of set S2

The cross-correlation of sequences at both truncation lengths 36 and 30 can be made low. Using ones of set S3

The sequence cross-correlation at both truncation lengths 36 and 72 can be made low. Of course, the above is only an example, and the sets S1 to S3 may also correspond to other truncation lengths, and are not described herein again.

In a fifth possible implementation manner, the absolute value of V is X1 or X2 or X3 or X4, and the relationship between X1 or X2 or X3 or X4 and N satisfies at least one row in table 11 below. At this time, optionally, in this implementation manner, the root index q of the first ZC sequence ₁ The above-mentionedRoot index q of second ZC sequence ₂ And a root indicator q of the third ZC sequence ₃ Can be determined according to the following formula:

wherein the content of the first and second substances,

optionally, let v ₁ ＝0，

or equivalently, the relationship of W and V is written uniformly as:

W＝(N+V)/2

TABLE 11

N	X1	X2	X3	X4
					97	71	71	71
113	79	39	17
					139	127	91	3	57
167	155	155	121	163
					191	9	125	5	77
211	9	5	5	3
					107	99	99	37
239	11	141	5	233
					283	13	7	7	3
311	13	9	9	303
					359	15	235	9	5
383	15	11	11	5
					431	19	11	11	419
449	19	13	13	437
					479	21	447	13	7
523	21	15	15	7
					571	25	17	15	7
619	27	19	17	9
					661	29	19	17	9
719	31	21	19	9
					761	33	23	21	9
787	33	23	21	11
					811	35	25	23	11
863	37	25	23	11
					911	39	27	25	11
953	41	29	25	13
					997	43	31	27	13
1051	45	37	29	13
					1103	47	33	29	15
1151	49	35	31	15
					1237	53	43	33	17
1291	55	39	35	17
					1327	57	45	35	17
1439	61	49	39	19
					1531	65	47	41	21
1583	69	49	43	21
					1627	71	55	45	21

The implementation mode has the advantages that the cross correlation of sequences with different truncation lengths can be optimized, the cross correlation between base sequences of the same sequence group is low under the truncation lengths, namely, the inter-sequence interference is low, and meanwhile, the interference between the base sequences of different sequence groups is not increased. X1-X4 in Table 11 may correspond to different truncation lengths, e.g., X1 corresponds to a truncation length of 24, and X2 corresponds toIs 30, X3 corresponds to a truncation of 36, and X4 corresponds to a truncation of 72. Of course, the above is only an example, and the lengths from X1 to X4 may also correspond to other truncation lengths, which are not described herein again. For example, if the prior art is directly extended, let v be 571 ₁ ＝0，v ₂ ＝1，v ₃ The cross-correlation value of the three base sequences of one sequence group at the truncation length 30 can reach 14.2dB, which is equivalent to introducing 14.2dB of inter-sequence interference, and is not acceptable. However, if Table 11 is used, let

When W is (N + V)/2 is 294, the cross correlation value of the three base sequences in one sequence group is 2.7dB at the maximum when the truncation length is 30, which is 11.5dB lower than the former, and the introduced inter-sequence interference is greatly reduced.

In a sixth possible implementation manner, the absolute value of V is X1 or X2 or X3, and the relationship between X1 or X2 or X3 and N satisfies at least one row in table 12 below. At this time, optionally, in this implementation manner, the root index q of the first ZC sequence ₁ And a root index q of the second ZC sequence ₂ And a root indicator q of the third ZC sequence ₃ Can be determined according to the following formula:

wherein i is 1, 2, 3, v ₁ ＝0，

or equivalently, the relationship of W and V is written uniformly as: w is (N + V)/2.

TABLE 12

The implementation mode has the beneficial effects that the V and/or the W can be determined by taking the cross correlation of at least two truncation length sequences as an optimization target, so that the frequency selection characteristic of a channel is better matched. For example, using X1 to determine

V, the sequence cross-correlation at both truncation lengths 24 and 30 can be made low. Using X2

The cross-correlation of sequences at both truncation lengths 36 and 30 can be made low. Using as in X3

The sequence cross-correlation at both truncation lengths 36 and 72 can be made low. Of course, the above are only examples, and the X1 to X3 may also correspond to other truncation lengths, which are not described herein again. For example, if the prior art is directly extended, let v be 571 ₁ ＝0，v ₂ ＝1，v ₃ If the value of the cross-correlation of the three base sequences in one sequence group is 14.2dB maximum at the truncation length 30, which is equivalent to 14.2dB of inter-sequence interference being introduced, and if the value of the cross-correlation is 14.3dB maximum at the truncation length 36, which is equivalent to 14.3dB of inter-sequence interference being introduced, it is unacceptable. However, if the one shown in Table 12 is used

W is (N + V)/2 is 293, the cross-correlation values of the three base sequences of one sequence group are at most 3.2dB for a truncation length of 30 and at most 36 for a truncation length of 36The cross correlation value can reach 2.7dB, which is respectively reduced by 11dB and 11.5dB compared with the former, and the introduced inter-sequence interference is greatly reduced.

In a seventh possible implementation, the relationship between the absolute value of V and N may satisfy at least one row in table 13-1 below, or at least one row in table 13-2 below. At this time, optionally, in this implementation, the root indicator q of the first ZC sequence ₁ And a root indicator q of the second ZC sequence ₂ And a root indicator q of the third ZC sequence ₃ Can be determined according to the following formula:

wherein i is 1, 2, 3, v ₁ ＝0，

TABLE 13-1

TABLE 13-2

The implementation mode has the beneficial effect that the V and/or the W can be determined to better match the frequency selection characteristic of a channel aiming at the cross correlation of the 30 and 36 truncation length sequences as an optimization target. In practical systems, 30 and 36 are two commonly used truncation lengths, matching the channel correlation bandwidth in most scenarios. Other beneficial effects are as described above, and are not described in detail.

In an eighth possible implementation manner, the absolute value of V is any integer in the set S1 or the set S2 or the set S3 or the set S4, and the relationship between the set S1 or the set S2 or the set S3 or the set S4 and N satisfies at least one row in the following table 14. Optionally, in this implementation manner, the root indicator q of the first ZC sequence ₁ And a root indicator q of the second ZC sequence ₂ And a root indicator q of the third ZC sequence ₃ Determined according to any one of the following formulas (a1) to (a 4):

wherein the content of the first and second substances,

optionally, let v ₁ ＝0，

u is a group identity or a cell identity of the first sequence group, B is an integer greater than 1, e.g., B ═ 31. At this time, W ═ V.

TABLE 14

N	S1	S2	S3	S4
					113	17，12，6	12，6，23，17	6，23，12	28，12，23，6
139	6，33，12，24	24，12，15	3，24，12，6	15，28，33
					167	7，29，4，20	29，20，31，18	4，23，9，31	2，36，18，15
191	8，33，20，26	33，23，20，14	5，33，11，42	47，35，14，
					211	9，50，25，5	39，22，4	36，5，18，43	52，26，45，9
107	8，23，15	8，15，23	8，15	15，23，8，
					239	10，57，21，6	41，49，9，25	6，41，29，33	59，3，51，11
283	12，49，67，7	49，21，42，69	8，69，7，39	4，70，16，61
					311	13，74，54，59	23，76，54，27	76，53，32，46	4，17，9，77
359	15，63，86，68	62，31，86，78	10，37	5，59，26，67
					383	16，67，92，91	66，92，46，57	66	63，27，21，15
431	18，103，75	52，74，16，32	12，105，74	6，71，92，65
					449	19，107，108，71	108，77，54，78	77，93	6，111，13，74
479	76，20，84，114	115，83，117，58	117，82，99，58	118，81，59，79
					523	83，22，125，126	126，90，63	54，90，89	129，7，86，120
571	24，91，100，136	69，98，137，99	16，59，139，98	141，94，58，47
					619	26，98，108	107，149，23	151，64，106，101	61，153，102，51
661	105	114，159，49	113，161，20，40	163，48，67，109
					719	114	124，173	175，123，117，74	10，118，91，73
761	121，133	131，183，92	185，186，130，23	125，188，75，94
					787	125，33，188，191	136，95	191，192，135，81	194，57，133，43
811	129	140，195，98	198，197，139	200，137，110，100
					863	137	208，149	89，210，211	12，213，85，142
911	145，217	157，110	221，94，222，156	225，66，150，154
					953	152	230，164，115	232，163，233	235，161，69，157
997	158，159	172，240	242，243，103	246，164，123
					1051	167	181，253	255，256，180	259，173，133，260
1103	175，176	266，190	269，114	272，80，112，181
					1151	183	198，199，277	281，279，119	16，284，189，63
1237		298，213	300，302	305，209，203，122
					1327	205	223，311，222		212，319，218，318
1439		320，229	322，324，137	218，327，224，328
					1531		347，248	349	355，237，243，182
1627		369，264	374，158	378，111，252，377

The sets S1 through S4 in the table 14 may correspond to different truncation lengths, for example, the set S1 corresponds to a truncation length of 24, the set S2 corresponds to a truncation length of 30, the set S3 corresponds to a truncation length of 36, and the set S4 corresponds to a truncation length of 72. The beneficial effects are as described above, and are not described in detail.

In a ninth possible implementation manner, the absolute value of V is any integer in the set S1 or the set S2 or the set S3, and the relationship between the set S1 or the set S2 or the set S3 and N satisfies at least one row in the following table 15. Optionally, in this implementation manner, the root indicator q of the first ZC sequence ₁ And a root indicator q of the second ZC sequence ₂ And a root indicator q of the third ZC sequence ₃ Determined according to the following equation (b):

wherein the content of the first and second substances,

optionally, let v ₁ ＝0，

Watch 15

N	S1	S2	S3
				113	17，12	12，6	6，17，23
139	10，24，21	6，15，21	3
				167	29，12，28	7，12，29	2，4
191	14，20，11	32，8，26	39，17，32
				211	15，16，22	39，38，36	38，52，43
107	8	8	8，15
				239	17，40，18	11，10，40	56，32，52
283	20，21，38	15，13，12	7，6，8
				311	22，23，19	29，28，54	7，24，66
359	26，25，27	18，19，16	9，8，7
				383	27，28，26	66	66，65，64
431	31，30，32	22，23，24	11，10，9
				449	32，33，31	88，89，85	11，10，31
479	91，90，89	117，115	118，117，
				523	98，99，97	66，65，107	60，81，58
571	42，41，40	30，31，29	22，23，21
				619	44，45，46	122，123，121	68，67，121
661	114，113，112	114，113	121，120，119
				719	124，123，122	141，142，143	18，19，17
761	131，130，129	149，150，151	134，133，132
				787	136，135，134	156，155，157	194，193，192
811	140，139，138	161，160，162	200，199，198
				863	163，165，164	110，109，108	22，23，21
911	157，156，155	179，180，181	225，224，223
				953	183，181，182	232，230	235，234，233
997	172，171，170	198，196，197	246，245，244
				1051	181，180，179	208，207，209	259，258，257
1103	208，211，209	269，268，266	272，271，270
				1151	198，197，196	228，226，227	30，29，31
1237	298，297，296	300，298	305，304，303
				1327	222，223，221	223	223，222，221
1439	320，319，318	322，321，320	235，236，237
				1531	347，344，343	349，348，347	355，354，353
1627	369，366，365	374，373，372	378，377，376

The implementation mode has the beneficial effects that the V and/or the W can be determined by taking the cross correlation of at least two truncation length sequences as an optimization target, so that the frequency selection characteristic of a channel is better matched. For example, using the method in S1

To determine V, the sequence cross-correlation at both truncation lengths 24 and 30 can be made low. Using the method in S2

The cross-correlation of sequences at both truncation lengths 36 and 30 can be made low. Using the method in S3

The cross-correlation of sequences at both truncation lengths 36 and 72 can be made low. Of course, the above is merely an example, S1The length to S3 may also correspond to other truncation lengths, which are not described in detail herein. For example, if the prior art is directly extended, let v be 571 ₁ ＝0，v ₂ ＝1，v ₃ If the value of the cross-correlation of the three base sequences in one sequence group is 14.2dB maximum at the truncation length 30, which is equivalent to 14.2dB of inter-sequence interference being introduced, and if the value of the cross-correlation is 14.3dB maximum at the truncation length 36, which is equivalent to 14.3dB of inter-sequence interference being introduced, it is unacceptable. However, if the one shown in Table 15 is used

When W is equal to-V is equal to-30, the cross correlation value of the three base sequences of one sequence group at the truncation length of 30 is 5.2dB at most, the cross correlation value at the truncation length of 36 can reach 4.8dB, the cross correlation values are respectively reduced by 9dB and 9.5dB compared with the former cross correlation values, and the introduced inter-sequence interference is greatly reduced.

In a tenth possible implementation manner, the absolute value of V is any integer of L1, L2, L3, or L4, and the relationship between L1, L2, L3, or L4 and N satisfies at least one row in table 16 below. Optionally, in this implementation manner, the root indicator q of the first ZC sequence ₁ And a root index q of the second ZC sequence ₂ And a root indicator q of the third ZC sequence ₃ Determined according to the following equation (b):

wherein the content of the first and second substances,

optionally, let v ₁ ＝0，

TABLE 16

N	L1	L2	L3	L4
					113	17	12	6	28
139	6	24	3
					167	7	29	4	2
191	8	33	5	47
					211	9	39	36	52
107	8	8	8	15
					239	10	41	6	59
283	12	49	8	4
					311	13	23	76	4
359	15	62	10	5
					383	16	66	66	63
431	18	52	12	6
					449	19	108	77	6
479	76	115	117	118
					523	83	126	54	129
571	24	69	16	141
					619	26	107	151	61
661	105	114	113	163
					719	114	124	175	10
761	121	131	185	125
					787	125	136	191	194
811	129	140	198	200
					863	137	208	89	12
911	145	157	221	225
					953	152	230	232	235
997	158	172	242	246
					1051	167	181	255	259
1103	175	266	269	272
					1151	183	198	281	16
1237		298	300	305
					1327	205	223	223	212
1439		320	322	218
					1531		347	349	355
1627		369	374	378

L1 through L4 in table 16 may correspond to different cutoff lengths, for example, L1 corresponds to a cutoff length of 24, L2 corresponds to a cutoff length of 30, L3 corresponds to a cutoff length of 36, and L4 corresponds to a cutoff length of 72. The beneficial effects are as described above and are not described in detail. Take N571 as an example, let v be directly extended from the prior art ₁ ＝0，v ₂ ＝1，v ₃ The cross-correlation values of the three base sequences of one sequence group at truncation length 30 are at most 14.2dB, introducing significant inter-sequence interference. However, if the one shown in Table 16 is used

And W-V-69, the cross correlation value of the three base sequences of one sequence group is 3.5dB at most when the truncation length is 30, the cross correlation value is reduced by 10.7dB compared with the cross correlation value of the three base sequences of one sequence group, and the introduced inter-sequence interference is greatly reduced.

In an eleventh possible implementation manner, the absolute value of V is any integer of L1 or L2 or L3, and the relationship between L1 or L2 or L3 and N satisfies at least one row in table 17 below. Optionally, in this implementation manner, the root indicator q of the first ZC sequence ₁ And a root indicator q of the second ZC sequence ₂ And a root indicator q of the third ZC sequence ₃ Determined according to the following equation (b):

wherein the content of the first and second substances,

optionally, let v ₁ ＝0，

TABLE 17

The implementation mode has the beneficial effects that the V and/or the W can be determined by taking the cross correlation of at least two truncation length sequences as an optimization target, so that the frequency selection characteristic of a channel is better matched. For example, using L1

To determine V, the sequence cross-correlation at both truncation lengths 24 and 30 can be made low. Using ones of L2

The cross-correlation of sequences at both truncation lengths 36 and 30 can be made low. Using as in L3

The cross-correlation of sequences at both truncation lengths 36 and 72 can be made low. Of course, the above is only an example, and L1 to L3 may also correspond to other truncation lengths, and are not described herein again.

In a twelfth possible implementation, the relationship between the absolute value of V and N satisfies at least one row in table 18-1 below, or at least one row in table 18-2 below. Optionally, in this implementation manner, the root index q of the first ZC sequence ₁ And a root indicator q of the second ZC sequence ₂ And a root indicator q of the third ZC sequence ₃ Determined according to the following equation (c):

wherein the content of the first and second substances,

optionally, let v ₁ ＝0，

TABLE 18-1

TABLE 18-2

N	V
		113	17
139	10
		167	29
191	14
		211	15
107	8
		239	17
283	20
		311	22
359	26
		383	27
431	31
		449	32
479	91
		523	98
571	42
		619	44
661	114
		719	124
761	131
		787	136
811	140
		863	163
911	157
		953	183
997	172
		1051	181
1103	208
		1151	198
1237	298
		1327	222
1439	320
		1531	347
1627	369

By the method provided by the embodiment of the present application, when one sequence group includes at least three sequences, and when any implementation manner of the first to twelfth implementations is satisfied, the network device may allocate at least three base sequences with the same length in one sequence group to different terminal devices at the same time, so that the number of terminal devices that can simultaneously transmit reference signal sequences and can be supported in one cell is at least three times that of the original terminal devices. Meanwhile, as the root index of the ZC sequence generating at least three base sequences with the same length in one sequence group is redesigned, the cross correlation of the at least three base sequences in one sequence group can be ensured to be very low, the inter-sequence interference is much lower than that of a signal, and the channel estimation accuracy based on the reference signal sequence is improved. Examples of the specific gain are as described above, and are not described in detail. In addition, the method provided by the embodiment of the application provides corresponding values of the absolute values of V and W for different N values, and can ensure that the cross correlation of the base sequence is very low under various M values. For example, if N571 is used, and if V24 and W24 are used as N139, the cross-correlation of the three base sequences would be as high as 5.6dB at the truncation length 30; if V-69 and W-69, which are recommended in table 16, are used, the cross-correlation may be 3.5dB or less.

As shown in fig. 2, a schematic structural diagram of a terminal device is provided for the embodiment of the present application. The terminal device may be configured to perform the actions of the terminal device in the foregoing method embodiments, where the terminal device 200 includes: a processing unit 201 and a transceiving unit 202.

A processing unit 201, configured to generate a reference signal sequence with a length M, where M is an integer greater than 1;

the reference signal sequence is generated by a base sequence with the length of M in a first sequence group allocated to the terminal equipment, the number of the base sequences with the length of M in the first sequence group is X, the ith base sequence in the X base sequences is generated by a base sequence with the length of N and a root index of q _i Generated by ZC sequence of (q) _i Is 1 to N-1, N is an integer greater than 1, and when the values of i are different, q is an integer greater than 1 _i The values of (A) are different; when X is an integer greater than or equal to 2, the root index of a first ZC sequence corresponding to the first sequence in any two base sequences in the X base sequences is q, the root index of a second ZC sequence corresponding to the second sequence in any two base sequences is (q + V) mod N, the absolute value of V is an integer greater than or equal to K1 and less than or equal to N-K1, and K1 is greater than 1; or, when X is an integer greater than or equal to 3, the root index of the first ZC sequence is q, the root index of the second ZC sequence is (q + V) mod N, the root index of a third ZC sequence generating a third sequence is (q + W) mod N, the absolute value of V is 1, the absolute value of W is greater than K2 and less than N-K2, K2 > 2, or the absolute value of V and the absolute value of W are integers greater than or equal to K3 and less than or equal to N-K3, K3 >1, the third sequence is any one of the X base sequences except for the first sequence and the second sequence;

a transceiving unit 202, configured to send the reference signal sequence.

wherein s is _i (M), M is 0,1, M-1 is the ith base sequence,

to generate a ZC sequence of the ith base sequence.

In one possible design, the transceiver unit 202 is further configured to:

acquiring first indication information and second indication information; the first indication information is used for indicating a group identifier of the first sequence group or a cell identifier of the first sequence group, and the second indication information is used for indicating one base sequence in the X base sequences;

the processing unit 201 is configured to obtain the reference signal sequence according to the first indication information and the second indication information.

or, when the cell identifier of the first sequence group is c1, the value of V is V1, the value of V is V1, and when the cell identifier of the first sequence group is c2, the value of V is V2, there are differences between c1 and c2, and differences between V1 and V2.

By the method, the value of V is related to the group identifier or the cell identifier of the first sequence group, which is beneficial for the network equipment to allocate the sequence groups, and the number of the base sequences with the length of M in each sequence group is as large as possible, so that more terminal equipment can be supported to send the reference signal sequences on the same time-frequency resource in the same cell, and the interference among the sequences is ensured to be small.

In one possible design, the absolute value of V is any integer in set a1 or set a2 or set A3 or set a4, and the relationship between set a1 or set a2 or set A3 or set a4 and N satisfies at least one row in table 2. The contents of table 2 are detailed in the examples section, and are not repeated herein.

b is an integer greater than 1, u is an integer determined according to a group identity of the first sequence group or a cell identity of the first sequence group, v _i Is set A ═ 0, a ₁ ，...，a _X-1 Element in (b), a _i Is an integer;

Or when X is 3, set

Or when X is 3, the set a is {0, a, -a }, and | a | ≧ 2.

Fig. 3 is a schematic structural diagram of a terminal device according to an embodiment of the present application. The terminal device shown in fig. 3 may be a hardware circuit implementation of the terminal device shown in fig. 2. For ease of illustration, fig. 3 shows only the main components of the terminal device. As shown in fig. 3, the terminal device 300 includes an application processor 301, a memory 302, a modem processor 303, an antenna 304, and a display screen 305. The application processor 301 is mainly configured to process the communication protocol and the communication data, control the entire terminal device, execute a software program, and process data of the software program, for example, to support the terminal device to perform the actions described in the above method embodiments, such as sending the first request message to the first cell. The memory 302 is primarily used to store software programs and data. The modem processor 303 is mainly used for converting baseband signals and radio frequency signals and processing radio frequency signals. The antenna 304 is mainly used for transmitting and receiving radio frequency signals in the form of electromagnetic waves in cooperation with the modem processor 303. The display 305 is mainly used for receiving instructions input by a user and displaying images, data and the like for the user. The terminal device 300 may also include other components, such as speakers, etc., which will not be described in detail herein.

An application processor 301 configured to generate a reference signal sequence of length M, M being an integer greater than 1;

the reference signal sequence is generated by a base sequence with the length of M in a first sequence group allocated to a terminal device, the number of the base sequences with the length of M in the first sequence group is X, and the ith base sequence in the X base sequences is generated by a base sequence with the length of N and a root index of q _i Generated by ZC sequence of (q) _i Is an integer from 1 to N-1, N is an integer greater than 1, and q is an integer greater than 1 when i is different in value _i The values of (A) are different; wherein, when X is an integer greater than or equal to 2, the root of the first ZC sequence corresponding to the first sequence in any two base sequences in the X base sequencesThe index is q, the root index of the second ZC sequence corresponding to the second sequence of the any two base sequences is (q + V) mod N, the absolute value of V is an integer which is greater than or equal to K1 and less than or equal to N-K1, and K1 is greater than 1; or, when X is an integer greater than or equal to 3, the root index of the first ZC sequence is q, the root index of the second ZC sequence is (q + V) mod N, the root index of a third ZC sequence generating a third sequence is (q + W) mod N, the absolute value of V is 1, the absolute value of W is greater than K2 and less than N-K2, K2 > 2, or the absolute value of V and the absolute value of W are integers greater than or equal to K3 and less than or equal to N-K3, K3 >1, the third sequence is any one of the X base sequences except for the first sequence and the second sequence;

a modem processor 303, configured to transmit the reference signal sequence.

wherein s is _i (M), M is 0,1, M-1 is the ith base sequence,

to generate a ZC sequence of the ith base sequence.

In one possible design, the modem processor 303 is further configured to:

the application processor 301 is configured to obtain the reference signal sequence according to the first indication information and the second indication information.

Or when X is 3, set

Or when X is 3, the set a is {0, a, -a }, and | a | ≧ 2.

As shown in fig. 4, a schematic structural diagram of a network device is provided for the embodiment of the present application. The network device may be configured to perform the actions of the network device in the above method embodiments, where the network device 400 includes: a transmitting unit 401 and a receiving unit 402.

A sending unit 401, configured to send configuration information, where the configuration information is used to configure a first sequence group,the number of base sequences with the length of M in the first sequence group is X, the ith base sequence in the X base sequences is formed by the base sequences with the length of N and the root index of q _i Generated by ZC sequence of (q) _i Is an integer from 1 to N-1, N is an integer greater than 1, and q is an integer greater than 1 when i is different in value _i The values of (A) are different; wherein when X is an integer greater than or equal to 2, a root index of a first ZC sequence corresponding to a first sequence of any two base sequences of the X base sequences is q, a root index of a second ZC sequence corresponding to a second sequence of the any two base sequences is (q + V) mod N, an absolute value of V is an integer greater than or equal to K1 and less than or equal to N-K1, and K1> 1; or, when X is an integer greater than or equal to 3, the root index of the first ZC sequence is q, the root index of the second ZC sequence is (q + V) mod N, the root index of a third ZC sequence generating a third ZC sequence is (q + W) mod N, the absolute value of V is 1, the absolute value of W is greater than K2 and less than N-K2, K2 > 2, or the absolute value of V and the absolute value of W are integers greater than or equal to K3 and less than or equal to N-K3, K3 >1, the third ZC sequence is any one of the X base sequences except for the first ZC sequence and the second ZC sequence;

a receiving unit 402, configured to receive a reference signal sequence, where the reference signal sequence is a base sequence in the first sequence group.

wherein s is _i (M), M is 0,1, M-1 is the ith base sequence,

to generate a ZC sequence of the ith base sequence.

In one possible design, the sending unit 401 is further configured to:

For different base sequence lengths M, the inter-sequence interference of base sequences with the same length in the first sequence group can be small. For base sequences with different lengths, if the absolute values of V are the same for all base sequences with different lengths, the interference between the base sequences in the first sequence group is small only under the values of some lengths M, and the interference between the base sequences in the first sequence group is large under the values of other lengths M. When the network device allocates the first sequence group to the terminal devices in the cell, a problem still occurs that sequence interference between terminal devices that transmit reference signal sequences of the same length is large. Therefore, under different base sequence lengths M, the absolute value of V has different values, so that sequence interference among a plurality of terminal devices transmitting reference signal sequences of any same length in the same cell is small, and inter-sequence interference among different sequence groups is not increased.

b is an integer greater than 1, u is an integer determined according to a group identity of the first sequence group or a cell identity of the first sequence group, v _i Is set A ═ 0, a ₁ ，...，a _X-1 InElement of (a) _i Is an integer;

Or when X is 3, set

Or when X is 3, the set a is {0, a, -a }, and | a | ≧ 2.

As shown in fig. 5, a schematic structural diagram of a network device is provided for the embodiment of the present application. The network device may be configured to perform the actions of the network device in the above method embodiments. The network device shown in fig. 5 may be a hardware circuit implementation of the network device shown in fig. 4. For ease of illustration, fig. 5 shows only the main components of the communication device. Optionally, the communication device may be a network device, or may be a device in a network device, such as a chip or a chip system, where the chip system includes at least one chip, and the chip system may further include other circuit structures and/or discrete devices. Optionally, taking the communication apparatus as a network device as an example, as shown in fig. 5, the network device 500 includes a processor 501, a memory 502, a transceiver 503, an antenna 504, and the like.

A transceiver 503, configured to send configuration information, where the configuration information is used to configure a first sequence group, where the number of base sequences with a length of M in the first sequence group is X, and an ith base sequence in the X base sequences has a length of N and a root index of q _i Generated by ZC sequence of (q) _i Is an integer from 1 to N-1, N is an integer greater than 1, and q is an integer greater than 1 when i is different in value _i Are different in value; wherein X is an integer greater than or equal to 2When the root index of the first ZC sequence corresponding to the first sequence in any two base sequences in the X base sequences is q, the root index of the second ZC sequence corresponding to the second sequence in any two base sequences is (q + V) mod N, the absolute value of V is an integer which is greater than or equal to K1 and less than or equal to N-K1, and K1 is greater than 1; or, when X is an integer greater than or equal to 3, the root index of the first ZC sequence is q, the root index of the second ZC sequence is (q + V) mod N, the root index of a third ZC sequence generating a third ZC sequence is (q + W) mod N, the absolute value of V is 1, the absolute value of W is greater than K2 and less than N-K2, K2 > 2, or the absolute value of V and the absolute value of W are integers greater than or equal to K3 and less than or equal to N-K3, K3 >1, the third ZC sequence is any one of the X base sequences except for the first ZC sequence and the second ZC sequence;

a transceiver 503, configured to receive a reference signal sequence, where the reference signal sequence is a base sequence in the first sequence group.

wherein s is _i (M), M is 0,1, M-1 is the ith base sequence,

to generate a ZC sequence of the ith base sequence.

In one possible design, the transceiver 503 is further configured to:

In one possible design, when the group in the first sequence group is identified as u1, the value of V is V1, and when the group in the first sequence group is identified as u2, the value of V is V2, there are differences between u1 and u2, and between V1 and V2; or when the cell identifier of the first sequence group is c1, the value of V is V1, the value of V is V1, and when the cell identifier of the first sequence group is c2, the value of V is V2, where c1 is different from c2, and V1 is different from V2.

For different base sequence lengths M, the inter-sequence interference of base sequences with the same length in the first sequence group can be small. For base sequences with different lengths, if the absolute values of V are the same for all base sequences with different lengths, the interference between the base sequences in the first sequence group is small only under the values of some lengths M, and the interference between the base sequences in the first sequence group is large under the values of other lengths M. When the network device allocates the first sequence group to the terminal devices in the cell, the problem still occurs that the sequence interference between the terminal devices transmitting the reference signal sequences with the same length is large. Therefore, under different base sequence lengths M, the absolute value of V has different values, so that sequence interference among a plurality of terminal devices transmitting reference signal sequences of any same length in the same cell is small, and inter-sequence interference among different sequence groups is not increased.

wherein when X is an integer of 2 or more, | a _i 1, | 2, i ≧ 1, ·, X-1; or, | a when X is an integer of 3 or more _i |＝1，|a _j I is an integer greater than or equal to 3, i is an integer greater than or equal to 1 and less than or equal to X-1, j is 1, ·, X-1 and j is not equal to i; orWhen X is 3, set

Or when X is 3, set

In the foregoing embodiment, the network device configures the first sequence group for the terminal device through the configuration information, and the terminal device may determine a base sequence with length M from the first sequence group to generate the reference signal sequence. In another possible implementation, the network device may also directly indicate to the terminal device a base sequence for generating the reference signal sequence, which is described in detail below.

As shown in fig. 6, a schematic flow chart of a communication method provided in the embodiment of the present application is shown, where the method includes:

step 601: and the network equipment sends second configuration information, wherein the second configuration information is used for configuring the first sequence.

The specific implementation manner of the second configuration information is not limited in this embodiment, and is not described herein again.

Step 602: and the terminal equipment receives second configuration information from the network equipment and generates a reference signal sequence with the length of M according to the first sequence indicated by the second configuration information. M is an integer greater than 1.

The reference signal sequence is determined by a first sequence with length M, wherein the first sequence is one of H base sequences, and H is an integer larger than 30. The generation manner of any base sequence in the H base sequences may refer to the description in the method flow shown in fig. 1. The H base sequences comprise H ₀ Basic sequence, H ₀ Is an integer of 30 < H ₀ H or less, wherein H is ₀ The ith base sequence pair in the base sequencesRoot of the corresponding ZC sequence is

The "H base sequences" refer to H base sequences formed by base sequences indicated by all possible values of the configuration information. The "all possible values of the configuration information" may be values of sequence indexes of base sequences available in the network, for example, there are 60 base sequences available in the network in total, and all possible values of the configuration information are values of the sequence indexes of the 60 available base sequences.

The "H base sequences formed by the base sequences indicated by all possible values of the configuration information" refers to: the H base sequences are the base sequences indicated by all possible values of all configuration information specified in the standard for configuring the first sequence. For example, in the current 3GPP standard, the configuration information includes a sequence group index and a sequence number (sequence number), where a value range of the sequence group index is 0 to 29, and a value of the sequence number is 0 or 1, and then the sequence number indicated by all possible values of the configuration information is 60 base sequences indicated by 30 possible values of the sequence group index and 2 possible values of the sequence number.

In one possible implementation, H > 30,

belong to a set

Wherein B is a positive integer, and B is a positive integer,

is composed of

The number of the determined integer is determined,

is an integer of 0 to N-1, V is an integer, and the absolute value of V is not less thanK1 and an integer of N-K1 or less, K1> 1.

In another possible implementation, H > 60,

belong to a set

Wherein B is a positive integer, and B is a positive integer,

is composed of

The number of the determined integer is determined,

It should be understood that, in this embodiment, the value range of the absolute value of V, W is the same as that in the method described in the foregoing fig. 1, and compared with the method described in fig. 1, the relationship between part of the base sequences in the H base sequences in this embodiment is the same as that between the base sequences in the first sequence group in the method described in fig. 1, so the description about the value range of the absolute value of V, W may refer to the method described in fig. 1, and is not repeated here.

In the embodiment of the present application, there is no concept of a sequence group, and the first sequence is determined by the terminal device directly from H base sequences with length M.

It should be understood that, the terminal device obtains the reference signal sequence with the length M, may be that the terminal device generates the reference signal sequence according to the first sequence and a predefined rule, or may obtain the reference signal sequence generated in advance by the terminal device through table lookup, which is not limited in this embodiment of the present application.

The reference signal sequence is determined by a first sequence with length M, it is understood that the reference signal sequence may be generated by the first sequence, or the reference signal sequence may be obtained by looking up a table according to the first sequence. Similarly, the first sequence is determined by a ZC sequence of length N, it is understood that the first sequence may be generated by the ZC sequence, or the first sequence may be obtained by table lookup based on the ZC sequence. The embodiments of the present application do not limit this.

In one possible design, the first sequence is generated from a ZC sequence and the reference signal sequence is generated from the first sequence. Optionally, the terminal device may generate the reference signal sequence to be sent according to a predefined rule and/or other signaling configuration and a base sequence (in this embodiment, the first sequence) in the H base sequences.

For example, the H-th base sequence of the H base sequences satisfies the following formula:

wherein s is _h (M), M is 0,1, M-1 is the h-th base sequence,

to generate a ZC sequence of the h base sequence.

It should be noted that, in this embodiment, the terminal device is not required to store the H base sequences, but the terminal device may be capable of generating the reference signal sequence to be transmitted according to the first sequence of the H base sequences when needed according to a predefined rule and/or other signaling configuration.

In another possible design, the first sequence is derived from a table lookup, and the reference signal sequence is generated from the first sequence. In this way, the terminal device can directly store all the H base sequences generated in advance and the correspondence between the base sequences and the respective ZC sequences (or roots of ZC sequences). After determining the M and ZC sequences (or the root of the ZC sequence), the terminal device can directly determine the first sequence by looking up a table. Further, the terminal device may generate the reference signal sequence through the first sequence according to the above formula, which is not described herein again.

In the embodiment of the present application, a ZC sequence corresponding to one base sequence refers to a ZC sequence for generating the base sequence, and for example, the first ZC sequence corresponding to the first sequence refers to a first ZC sequence for generating the first sequence. "correspond" herein refers to such a relationship that a base sequence is generated from a ZC sequence. The H base sequences are generated from H ZC sequences of length N, and each of the H base sequences is generated from a corresponding ZC sequence, and the corresponding ZC sequences are different from each other.

By the communication method provided by the embodiment of the application, the number of the base sequences which can be scheduled by the base station is increased, so that different terminal devices in the same cell can use the reference signal sequences determined by a plurality of base sequences with the same length, and the reference signals are sent on the same time-frequency resource, so that the number of the terminal devices which can send the reference signals with the same length at the same time and the same frequency is increased, the interference power between the reference signal sequences can be ensured to be very low while the number of the reference signal sequences is increased, and the accuracy of channel measurement of the network device based on the reference signals is improved.

In a possible implementation manner, the second configuration information may indicate the first sequence from among the H base sequences. The terminal device may determine the first sequence according to the second configuration information, so as to obtain a reference signal sequence with a length of M according to the first sequence. The second configuration information indicates the first sequence, and may be a direct indication or an indirect indication, which is not limited in this embodiment of the application. For example, the second configuration information may be a sequence identifier of the first sequence, and the terminal device may determine the first sequence directly according to the sequence identifier; alternatively, the second configuration information may be a parameter for generating the first sequence

And

the terminal equipment can be based on the parameters

And

calculate the root q of the first sequence ₁ Then, generating a first sequence according to the following method; alternatively, the second configuration information may be directly the root q of the first sequence ₁ The terminal device can use the root q ₁ And generating a first sequence s of length M by the following formula ₁ (m)：

In one possible design, when H ZC sequences of a first length correspond to the H base sequences, the value of V is V1, and when H ZC sequences of a second length correspond to the H base sequences, the value of V is V2; there is a difference between the first length and the second length, and an absolute value of the V1 is different from an absolute value of the V2.

In one possible design, where H is an integer greater than 60, the V and the W satisfy the following equation:

As an alternative embodiment, the root of the ZC sequence of the H base sequence of the H base sequences

Satisfying at least one of the following formulas:

where B is an integer greater than 1, e.g., B ═ 31.

Is a set

Element of (1), a _i Is an integer which is the number of the whole,

I _h and a sequence index (sequence Id) corresponding to the H-th base sequence in the H base sequences, wherein H is an integer which is greater than or equal to 1 and less than or equal to H.

In one possible implementation, when H is an integer greater than 30,

alternatively, a _i For the integer determined according to V, the description of the value range of the absolute value of V can refer to the method described in fig. 1 when X is an integer greater than or equal to 2;

in a second possible implementation, when H is an integer greater than 60, | a _i |＝1，|a _j I is not less than 1 and not more than 3

The number of the integer (c) of (d),

and j is not equal to i; or H is an integer greater than 60Time counting, collecting

Or H is an integer greater than 60, set

Or when H is an integer greater than 60, the set a ═ {0, a, -a }, | a | ≧ 2.

Illustratively, when H is an integer greater than 60, | a _i |＝1，|a _j When | ≧ 3, under this condition, the value of the absolute value of V may refer to the description in the second possible scenario described above, that is, the scenario in which each sequence group includes at least 3 sequences, the first possible implementation manner to the twelfth possible implementation manner. The value of W can be determined from the value of V.

Illustratively, H is an integer greater than 60, set

When | a | ≧ 1, under this condition, in an implementation manner, the absolute value of V is any integer in set S1, set S2, set S3, or set S4, and a relationship between set S1, set S2, set S3, or set S4 and N satisfies at least one row in table 7. Accordingly, the value of W can be determined according to the formula (4-3) or (4-4).

In another implementation manner, the absolute value of V is L1 or L2 or L3 or L4, and the relationship between L1 or L2 or L3 or L4 and N satisfies at least one row in table 8. Accordingly, the value of W can be determined according to the formula W ═ N + V)/2.

Illustratively, H is an integer greater than 60, set

Under this condition, the absolute value of V may be at least one row in tables 9 to 13-2. Accordingly, the value of W can be determined according to the formula W ═ N + V)/2.

For example, H is an integer greater than 60, and the set a ═ {0, a, -a }, | a | ≧ 2, under which the absolute value of V may be at least one row in tables 14 to 18. Accordingly, the value of W can be determined according to the formula W ═ V.

Step 603: and the terminal equipment transmits the reference signal sequence.

Step 604: the network device receives the reference signal sequence from the terminal device.

In the above method, in the prior art, all terminal devices in a cell can only use the same base sequence to generate the reference signal sequence, so that different terminal devices need to transmit the reference signal sequence in turn in a time division manner, resulting in a larger transmission period of the reference signal sequence. By using the method provided by the embodiment of the application, in one cell, the network device can indicate different base sequences to different terminal devices, so that in one cell, the base sequences used by different terminal devices for generating the reference signal sequences may be different, and different terminal devices can simultaneously use different base sequences to transmit the reference signal sequences, thereby improving the channel estimation accuracy based on the reference signal sequences and avoiding the serious outdated problem of channel state information. Meanwhile, different terminal devices can simultaneously use different base sequences to transmit the reference signal sequences when the base sequences used by the different terminal devices to generate the reference signal sequences are different, so that the interval of transmitting the reference signal sequences by the terminal devices can be shortened, and the problem that the channel state information is outdated is avoided.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims

1. A method of communication, comprising:

the terminal equipment generates a reference signal sequence with the length of M, wherein M is an integer larger than 1;

the reference signal sequence is generated by a base sequence with the length of M in a first sequence group allocated to the terminal equipment, the number of the base sequences with the length of M in the first sequence group is X, and the ith base sequence in the X base sequences is generated by a base sequence with the length of N and a root index of q _i Generated by ZC sequence of (q) _i Is an integer from 1 to N-1, N is an integer greater than 1, and q is an integer greater than 1 when i is different in value _i The values of (A) are different; wherein, when X is an integer greater than or equal to 2, the first sequence pair in any two base sequences in the X base sequencesThe root index of the corresponding first ZC sequence is q, the root index of the corresponding second ZC sequence of the second two base sequences is (q + V) mod N, the absolute value of V is an integer which is greater than or equal to K1 and less than or equal to N-K1, K1>1; or, when X is an integer greater than or equal to 3, the root index of the first ZC sequence is q, the root index of the second ZC sequence is (q + V) mod N, the root index of the third ZC sequence generating the third ZC sequence is (q + W) mod N, the absolute value of V is 1, the absolute value of W is greater than K2 and less than N-K2, K2>2, or the absolute value of V and the absolute value of W are integers equal to or greater than K3 and equal to or less than N-K3, K3>1, the third sequence is any base sequence except the first sequence and the second sequence in the X base sequences;

and the terminal equipment transmits the reference signal sequence.

2. The method of claim 1, wherein an ith base sequence of the X base sequences satisfies the following formula:

wherein s is _i (M), M is 0,1, M-1 is the ith base sequence,

to generate a ZC sequence of the ith base sequence.

3. The method according to any one of claims 1 to 2, further comprising:

4. The method of claim 3, wherein when the group in the first sequence group is identified as u1, the value of V is V1, when the group in the first sequence group is identified as u2, the value of V is V2, there are u1 different from u2, and V1 is different from V2;

5. The method according to any one of claims 1 to 4, wherein when the length of the first ZC sequence and the length of the second ZC sequence are both of a first length, V takes a value of V1, and when the length of the first ZC sequence and the length of the second ZC sequence are both of a second length, V takes a value of V2;

there is a difference between the first length and the second length, and an absolute value of the V1 is different from an absolute value of the V2.

6. The method according to any one of claims 1 to 5, wherein the absolute value of V is any integer of set A1 or set A2 or set A3 or set A4, and the relationship between set A1 or set A2 or set A3 or set A4 and N satisfies at least one row in the following table:

7. the method according to any one of claims 1 to 6, wherein when X is an integer of 3 or more, V and W satisfy the following formula:

8. The method according to claim 7, wherein the absolute value of V is any integer in the set S1 or the set S2 or the set S3 or the set S4, and the relation between the set S1 or the set S2 or the set S3 or the set S4 and N satisfies at least one row in the following table;

9. method according to any of claims 1 to 8, characterized in that a root index q of a ZC sequence of the ith base sequence of said X base sequences is generated _i Satisfying at least one of the following formulas:

b is an integer greater than 1, u is an integer determined according to a group identity of the first sequence group or a cell identity of the first sequence group, v _i Is the set A ═ 0, a ₁ ,...,a _X-1 Element in (b), a _i Is an integer;

when X is an integer of 2 or more, | a _i 1, | ≧ 2, …, X-1; or, | a when X is an integer of 3 or more _i |＝1，|a _j I is an integer of 1 or more and X-1 or less, j is 1, X-1 and j is not equal to i; or when X is 3, set

A | > is more than or equal to 1; or when X is 3, set

The | a | > is more than or equal to 2; or when X is 3, the set a is {0, -a, a }, | a | ≧ 2.

10. A method of communication, comprising:

the network equipment sends configuration information, wherein the configuration information is used for configuring a first sequence group, the number of base sequences with the length of M in the first sequence group is X, the ith base sequence in the X base sequences is formed by the length of N and a root index of q _i Generated by ZC sequence of (q) _i Is an integer from 1 to N-1, N is an integer greater than 1, and q is an integer greater than 1 when i is different in value _i The values of (A) are different; wherein when X is an integer greater than or equal to 2, the root index of a first ZC sequence corresponding to a first sequence of any two base sequences of the X base sequences is q, the root index of a second ZC sequence corresponding to a second sequence of the any two base sequences is (q + V) mod N, the absolute value of V is an integer greater than or equal to K1 and less than or equal to N-K1, K1>1; alternatively, when X is an integer greater than or equal to 3, the root index of the first ZC sequence is q, the root index of the second ZC sequence is (q + V) mod N, and a third ZC of a third ZC sequence is generatedThe root index of the C sequence is (q + W) mod N, the absolute value of V is 1, the absolute value of W is more than K2 and less than N-K2, K2>2, or the absolute value of V and the absolute value of W are integers equal to or greater than K3 and equal to or less than N-K3, K3>1, the third sequence is any base sequence except the first sequence and the second sequence in the X base sequences;

the network device receives a reference signal sequence, which is a base sequence in the first sequence group.

11. The method of claim 10, wherein an ith base sequence of the X base sequences satisfies the following formula:

wherein s is _i (M), M is 0,1, M-1 is the ith base sequence,

to generate a ZC sequence of the ith base sequence.

12. The method according to claim 10 or 11, characterized in that the method further comprises:

13. The method of claim 12, wherein when the group in the first sequence group is identified as u1, the value of V is V1, when the group in the first sequence group is identified as u2, the value of V is V2, there are u1 and u2 different, and V1 and V2 different;

14. The method according to any of claims 10 to 13, wherein when the length of the first ZC sequence and the length of the second ZC sequence are both a first length, V is V1, and when the length of the first ZC sequence and the length of the second ZC sequence are both a second length, V is V2;

15. The method according to any one of claims 10 to 14, wherein the absolute value of V is any integer of set a1 or set a2 or set A3 or set a4, and the relationship between set a1 or set a2 or set A3 or set a4 and N satisfies at least one row in the following table:

16. the method according to any one of claims 10 to 15, wherein when X is an integer greater than or equal to 3, V and W satisfy the following formula:

17. The method according to claim 16, wherein the absolute value of V is any integer in set S1 or set S2 or set S3 or set S4, and the relationship between set S1 or set S2 or set S3 or set S4 and N satisfies at least one row in the following table;

18. method according to any of claims 10 to 17, characterized in that a root index q of a ZC sequence of the ith base sequence of said X base sequences is generated _i Satisfying at least one of the following formulas:

b is an integer greater than 1, u is an integer determined according to a group identity of the first sequence group or a cell identity of the first sequence group,v _i is set A ═ 0, a ₁ ,...,a _X-1 Element in (b), a _i Is an integer;

wherein when X is an integer of 2 or more, | a _i 1, | ≧ 2, …, X-1; or, | a when X is an integer of 3 or more _i |＝1，|a _j I is an integer of 1 or more and X-1 or less, j is 1, X-1 and j is not equal to i; or when X is 3, set

A | > is more than or equal to 1; or when X is 3, set

A | > is more than or equal to 1; or when X is 3, the set a is {0, a, -a }, and | a | ≧ 2.

19. A communications apparatus, comprising:

a processing unit for generating a reference signal sequence of length M, M being an integer greater than 1;

the reference signal sequence is generated by a base sequence with the length of M in a first sequence group allocated to a terminal device, the number of the base sequences with the length of M in the first sequence group is X, and the ith base sequence in the X base sequences is generated by a base sequence with the length of N and a root index of q _i Generated by ZC sequence of (q) _i Is an integer from 1 to N-1, N is an integer greater than 1, and q is an integer greater than 1 when i is different in value _i The values of (A) are different; wherein, when X is an integer greater than or equal to 2, a root index of a first ZC sequence corresponding to a first sequence of any two base sequences of the X base sequences is q, a root index of a second ZC sequence corresponding to a second base sequence of the any two base sequences is (q + V) mod N, an absolute value of V is an integer greater than or equal to K1 and less than or equal to N-K1, K1>1; or, when X is an integer greater than or equal to 3, the root index of the first ZC sequence is q, the root index of the second ZC sequence is (q + V) mod N, the root index of the third ZC sequence generating the third ZC sequence is (q + W) mod N, the absolute value of V is 1, and the absolute value of W isA value greater than K2 and less than N-K2, K2>2, or the absolute value of V and the absolute value of W are integers greater than or equal to K3 and less than or equal to N-K3, K3>1, the third sequence is any base sequence except the first sequence and the second sequence in the X base sequences;

and the transceiving unit is used for transmitting the reference signal sequence.

20. The apparatus of claim 19, wherein an ith base sequence of the X base sequences satisfies the following formula:

wherein s is _i (M), M is 0,1, M-1 is the ith base sequence,

to generate a ZC sequence of the ith base sequence.

21. The apparatus according to any of claims 19 to 20, wherein the transceiver unit is further configured to:

the processing unit is configured to obtain the reference signal sequence according to the first indication information and the second indication information.

22. The apparatus of claim 21, wherein when the group in the first sequence group is identified as u1, the value of V is V1, and when the group in the first sequence group is identified as u2, the value of V is V2, and there are u1 and u2 different, and V1 and V2 different;

23. The apparatus of any one of claims 19 to 22, wherein when X is an integer greater than or equal to 3, V and W satisfy the following equation:

24. A communications apparatus, comprising:

a sending unit, configured to send configuration information, where the configuration information is used to configure a first sequence group, the number of base sequences with a length of M in the first sequence group is X, and an ith base sequence of the X base sequences is formed by a base sequence with a length of N and a root index of q _i Generated by ZC sequence of (q) _i Is an integer from 1 to N-1, N is an integer greater than 1, and q is an integer greater than 1 when i is different in value _i The values of (A) are different; wherein when X is an integer greater than or equal to 2, the root index of a first ZC sequence corresponding to a first sequence of any two base sequences of the X base sequences is q, the root index of a second ZC sequence corresponding to a second ZC sequence of the any two base sequences is (q + V) mod N, the absolute value of V is an integer greater than or equal to K1 and less than or equal to N-K1, K1>1; or, when X is an integer greater than or equal to 3, the root index of the first ZC sequence is q, the root index of the second ZC sequence is (q + V) mod N, the root index of the third ZC sequence generating the third ZC sequence is (q + W) mod N, the absolute value of V is 1, the absolute value of W is greater than K2 and less than N-K2, K2>2, or the absolute value of V and the absolute value of W are integers equal to or greater than K3 and equal to or less than N-K3, K3>1, the third sequence is any base sequence except the first sequence and the second sequence in the X base sequences;

a receiving unit, configured to receive a reference signal sequence, where the reference signal sequence is a base sequence in the first sequence group.

25. The apparatus of claim 24, wherein the sending unit is further configured to:

sending first indication information and second indication information; the first indication information is used to indicate a group identifier of the first sequence group or a cell identifier of the first sequence group, and the second indication information is used to indicate one base sequence of the X base sequences.

26. The apparatus of claim 25, wherein when the group in the first sequence group is identified as u1, the value of V is V1, and when the group in the first sequence group is identified as u2, the value of V is V2, and there are u1 and u2 different, and V1 and V2 different;

27. The apparatus of any of claims 24 to 26, wherein when the length of the first ZC sequence and the length of the second ZC sequence are both a first length, V is V1, and when the length of the first ZC sequence and the length of the second ZC sequence are both a second length, V is V2;

28. A communications apparatus, comprising: a memory for storing instructions and a processor for executing the instructions stored by the memory, and execution of the instructions stored in the memory causes the processor to perform the method of any of claims 1 to 18.

29. A computer readable storage medium comprising computer readable instructions which, when read and executed by a communication apparatus, cause the communication apparatus to perform the method of any one of claims 1 to 18.