CN108111285B - Method and device for transmitting reference signal - Google Patents
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Abstract
A method and device for transmitting reference signals comprise: generating a first sequence according to an initial value of the first sequence determined by the first time index number; generating a second sequence from the first sequence and the second time index number; mapping part of elements in the second sequence to Resource Elements (REs) for transmitting reference signals according to the corresponding relation; wherein the elements in the second sequence correspond to REs of the second time index. The embodiment of the invention generates the second sequence according to the generated first sequence, reduces the memory space and the computation of the sequence, and reduces the complexity of a system for transmitting reference information.
Description
Technical Field
The present disclosure relates to, but not limited to, wireless communication technologies, and more particularly, to a method and apparatus for transmitting reference signals.
Background
With the rapid development of wireless communication demands in life and production, the fourth generation of Long Term Evolution (LTE), the LTE-a (LTE-Advanced), and the fifth generation of New Radio Access Technology (NR, New RAT) schemes all use Orthogonal Frequency Division Multiplexing (OFDM) modulation-based technologies. In the OFDM communication system, the radio resource unit system used is as follows: in time domain, a Slot (Slot) is composed of a plurality of continuous OFDM symbols, and a Frame (Frame) is composed of a plurality of continuous slots; in the frequency domain, a Resource Block (RB) is composed of a plurality of consecutive subcarriers (sub carriers); a grid is formed by OFDM symbols and subcarriers, and an Element in the grid, namely an intersection of one OFDM symbol in a time domain and one subcarrier in a frequency domain, is a Resource Element (RE). Wireless communication systems typically estimate the channel using Reference signals (RS, Reference Signal); for example, a Channel is estimated using a Channel-State Information reference signal (CSI-RS) to obtain Channel State Information as reference Information for a scheduling operation; for example, the channel coefficients are estimated using a Demodulation Reference Signal (DMRS) to demodulate data. Since the fifth generation wireless communication technology can use a high frequency band, an influence of Phase noise on data transmission is increased, and a Phase-tracking reference signal (PTRS) is introduced in order to track the influence of Phase noise on a channel in order to improve demodulation performance. The phase tracking reference signal, the demodulation reference signal and the corresponding data needing to be demodulated are positioned in the same bandwidth; the phase tracking reference signals are generally denser than the corresponding demodulation reference signals in the time domain and are configured by the base station side; relatively sparse in the frequency domain, and the frequency domain location may vary. In order to reduce the interference generated by the reference signal in the transmission, the elements on the pseudo-random sequence are mapped onto the REs for transmission as the reference signal, that is, the transmitting side maps the elements on the pseudo-random sequence onto the REs for transmission as the reference signal, and the receiving side receives the elements on the pseudo-random sequence as the reference signal from the corresponding REs and uses the elements on the pseudo-random sequence as the reference signal generated by the receiving side itself to act on the elements on the pseudo-random sequence as the reference signal received from the corresponding REs, thereby obtaining the estimation of the radio channel coefficient. In order to avoid superposition interference generated by operation in channel estimation and avoid fixed interference generated at different resource positions, different time domain positions need to use mutually randomized elements, and different frequency domain positions need to use mutually randomized elements; these mutually randomized elements are usually from elements of different indices in the same pseudo-random sequence or from elements in different pseudo-random sequences to ensure mutual randomization between the elements at these different positions. In LTE/LTE-a, the actually used random sequence is generally a sequence obtained by discarding a lower sequence number fragment, a specific type of modulation signal sequence is generated by using the obtained random sequence, and elements in the modulation signal sequence are mapped to REs again to be used as reference signals for transmission; that is, even if only a sequence having a small length for mapping to REs is required, a pseudo-random sequence having a large length needs to be generated by the pseudo-random sequence generator because a segment having a lower sequence number is discarded; for example, in LTE/LTE-a, sequence fragments of length 1600 need to be discarded; this wastes a large number of sequence elements per initialization to generate a pseudorandom sequence. In the case of NR, the time domain position of the reference signal may vary, with more possible time domain positions of the reference signal; the frequency domain position can be changed, and the possible frequency domain positions are more; different REs on the same OFDM symbol and the same resource block have the requirements of corresponding elements with mutual randomness; the maximum bandwidth required to be supported by NR is far greater than that of LTE/LTE-A; that is, in NR, a large number of elements having mutual randomness need to be generated and mapped to REs that may be used for transmission of reference signals; the adoption of the scheme can bring about great increase of complexity of the system in terms of computation and storage units, namely increase of system complexity.
Disclosure of Invention
The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.
Embodiments of the present invention provide a method and an apparatus for transmitting a reference signal, which can reduce the storage amount and the computation amount of a sequence and reduce the complexity of a system for transmitting reference information.
The embodiment of the invention provides a method for transmitting reference signals, which comprises the following steps:
generating a first sequence according to an initial value of the first sequence determined by the first time index number;
generating a second sequence from the first sequence and a second time index number;
mapping part of elements in the second sequence to Resource Elements (RE) for transmitting reference signals according to the corresponding relation;
wherein the elements in the second sequence correspond to REs of the second time index.
In another aspect, an embodiment of the present invention further provides an apparatus for transmitting a reference signal, including: a first generating unit, a second generating unit and a mapping unit; wherein,
the first generating unit is used for: generating a first sequence according to an initial value of the first sequence determined by the first time index number;
the second generating unit is used for: generating a second sequence from the first sequence and a second time index number;
the mapping unit is used for: mapping part of elements in the second sequence to Resource Elements (RE) for transmitting reference signals according to the corresponding relation;
wherein the elements in the second sequence correspond to REs of the second time index.
In still another aspect, an embodiment of the present invention further provides a computer storage medium, where computer-executable instructions are stored in the computer storage medium, and the computer-executable instructions are configured to perform the method described above.
In another aspect, an embodiment of the present invention further provides a terminal, including: a memory and a processor; wherein,
the processor is configured to execute program instructions in the memory;
the program instructions read on the processor to perform the following operations:
generating a first sequence according to an initial value of the first sequence determined by the first time index number;
generating a second sequence from the first sequence and a second time index number;
mapping part of elements in the second sequence to REs for transmitting reference signals according to the corresponding relation;
wherein the elements in the second sequence correspond to resource elements RE of the second time index.
Compared with the related art, the technical scheme of the application comprises the following steps: generating a first sequence according to an initial value of the first sequence determined by the first time index number; generating a second sequence from the first sequence and the second time index number; mapping part of elements in the second sequence to Resource Elements (REs) for transmitting reference signals according to the corresponding relation; wherein the elements in the second sequence correspond to REs of the second time index. The embodiment of the invention generates the second sequence according to the generated first sequence, reduces the memory space and the computation of the sequence, and reduces the complexity of a system for transmitting reference information.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.
FIG. 1 is a flowchart illustrating a method for transmitting a reference signal according to an embodiment of the present invention;
fig. 2 is a block diagram of an apparatus for transmitting a reference signal according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The steps illustrated in the flow charts of the figures may be performed in a computer system such as a set of computer-executable instructions. Also, while a logical order is shown in the flow diagrams, in some cases, the steps shown or described may be performed in an order different than here.
Fig. 1 is a flowchart of a method for transmitting a reference signal according to an embodiment of the present invention, as shown in fig. 1, including:
optionally, the generating the first sequence in the embodiment of the present invention includes:
performing tensor product operation on the two element sequences to generate the first sequence;
wherein one of the two element sequences is generated according to the first time index number.
Optionally, in the embodiments of the present invention, both element sequences are derived from the same parent sequence;
wherein the parent sequence is obtained according to the first temporal index number.
Optionally, in two element sequences of the embodiment of the present invention:
the element index number of one element sequence corresponds to the resource block index number of the RE;
the element index number of the other one of the element sequences corresponds to the subcarrier index number of the RE.
Here, in order to distinguish the two element sequences, the two element sequences may be defined as a first element sequence and a second element sequence, and the element index number of the first element sequence may correspond to the resource block index number of the RE; the element index number of the second element sequence corresponds to the subcarrier index number of the RE.
Optionally, the initial value determined according to the first time index number in the embodiment of the present invention includes:
and determining the initial value of the first sequence according to the port group index number or the port group identification number and the first time index number in a combined manner.
102, generating a second sequence by the first sequence and a second time index number; wherein the elements in the second sequence correspond to REs of the second time index.
Optionally, the generating the second sequence in the embodiment of the present invention includes:
multiplying the first sequence by a preset coefficient to generate a second sequence;
wherein the preset coefficients include: a function of the second time index number.
Optionally, the preset coefficients in the embodiment of the present invention include:
presetting elements in a sequence; wherein the sequence numbers of the elements in the preset sequence are a function of the second time index number.
Optionally, in the embodiment of the present invention, the elements in the preset sequence and the elements in the first sequence are from the same parent sequence.
Optionally, the elements in the preset sequence in the embodiment of the present invention are from the first sequence.
Optionally, the generating the second sequence in the embodiment of the present invention includes:
carrying out tensor product operation on the two element sequences to obtain the second sequence;
wherein a sequence of elements is generated from the first sequence and the second time index number.
In the embodiment of the present invention, the correspondence between the elements in the second sequence and the REs of the second time index may be established in one of the following manners, or in two or more manners, and the correspondence is established in part:
optionally, in the embodiment of the present invention, the correspondence between the element in the second sequence and the RE of the second time index is determined according to a bandwidth of the configuration reference signal.
Optionally, in the embodiment of the present invention, the pattern category determination of the reference signal is configured according to a correspondence relationship between the element in the second sequence and the RE of the second time index.
Optionally, in the embodiment of the present invention, the correspondence between the element in the second sequence and the RE of the second time index number is set according to the following manner:
each 12 elements in the second sequence corresponds to an RE on one resource block of one orthogonal frequency division multiplexing, OFDM, symbol.
Optionally, the second sequence and the first sequence belong to the same type of modulation sequence.
compared with the related art, the technical scheme of the application comprises the following steps: generating a first sequence according to an initial value of the first sequence determined by the first time index number; generating a second sequence from the first sequence and the second time index number; mapping part of elements in the second sequence to Resource Elements (REs) for transmitting reference signals according to the corresponding relation; wherein the elements in the second sequence correspond to REs of the second time index. The embodiment of the invention generates the second sequence according to the generated first sequence, reduces the memory space and the computation of the sequence, and reduces the complexity of a system for transmitting reference information.
Fig. 2 is a block diagram of an apparatus for transmitting a reference signal according to an embodiment of the present invention, as shown in fig. 2, including: a first generating unit, a second generating unit and a mapping unit; wherein,
the first generating unit is used for: generating a first sequence according to an initial value of the first sequence determined by the first time index number;
optionally, the first generating unit in the embodiment of the present invention is specifically configured to: performing tensor product operation on the two element sequences to generate the first sequence;
wherein one of the two element sequences is generated according to the first time index.
Optionally, in the embodiments of the present invention, both of the two element sequences are derived from the same parent sequence; wherein the parent sequence is obtained according to the first time index number; or,
in the two element sequences: the element index number of one element sequence corresponds to the resource block index number of the RE; the element index number of one of the element sequences corresponds to the subcarrier index number of the RE.
Optionally, the first generating unit in the embodiment of the present invention is specifically configured to:
determining an initial value of the first sequence according to the port group index number or the port group identification number and the first time index number in a combined manner;
generating the first sequence according to the determined initial value.
The second generating unit is used for: generating a second sequence from the first sequence and a second time index number;
optionally, the second generating unit in the embodiment of the present invention is specifically configured to:
multiplying the first sequence by a preset coefficient to generate a second sequence;
wherein the preset coefficients include: a function of the second time index number.
Optionally, the preset coefficients in the embodiment of the present invention include:
presetting elements in a sequence; wherein the sequence numbers of the elements in the preset sequence are a function of the second time index number.
Optionally, in the embodiment of the present invention, the elements in the preset sequence and the elements in the first sequence are from the same parent sequence.
Optionally, the elements in the preset sequence in the embodiment of the present invention are from the first sequence.
Optionally, the second generating unit in the embodiment of the present invention is specifically configured to:
carrying out tensor product operation according to the two element sequences to obtain the second sequence;
wherein a sequence of elements is generated from the first sequence and the second time index number.
Optionally, in the embodiment of the present invention, the correspondence between the elements in the second sequence and the REs of the second time index is established according to at least one of the following ways:
determining according to the bandwidth of the configuration reference signal;
determining according to the pattern category of the configuration reference signal;
and according to each 12 elements in the second sequence, corresponding to RE on one resource block of one orthogonal frequency division multiplexing OFDM symbol.
Optionally, the second sequence and the first sequence belong to the same type of modulation sequence.
The mapping unit is used for: mapping part of elements in the second sequence to Resource Elements (RE) for transmitting reference signals according to the corresponding relation;
wherein the elements in the second sequence correspond to REs of the second time index.
The embodiment of the invention also provides a computer storage medium, wherein the computer storage medium stores computer executable instructions, and the computer executable instructions are used for executing the method.
An embodiment of the present invention further provides a terminal, including: a memory and a processor; wherein,
the processor is configured to execute program instructions in the memory;
the program instructions read on the processor to perform the following operations:
generating a first sequence according to an initial value of the first sequence determined by the first time index number;
generating a second sequence from the first sequence and a second time index number;
mapping part of elements in the second sequence to REs for transmitting reference signals according to the corresponding relation;
wherein the elements in the second sequence correspond to resource elements RE of the second time index.
The method of the embodiments of the present invention is illustrated below by way of application examples, which are merely intended to set forth embodiments of the present invention.
Application example
The application example method comprises the following steps: generating a first sequence according to an initial value of the first sequence determined by the first time index number; generating a second sequence from the first sequence and the second time index number; wherein the elements in the second sequence correspond to REs of the second time index number; mapping part of elements in the second sequence to REs for transmitting reference signals according to the corresponding relation; for example:
the first time index number is a time slot index number, and the second time index number is an OFDM symbol index number.
The first time index number is a frame index number and the second time index number is a slot index number.
The first time index number is a frame index number and the second time index number is an OFDM symbol index number.
The first time index is a combination of a frame index and a slot index, and the second time index is an OFDM symbol index.
The first time index number is a frame index number and the second time index number is a combination of a slot index number and an OFDM symbol index number.
The first sequence may be a Binary Phase Shift Keying (BPSK) modulation sequence, a Quadrature Phase Shift Keying (QPSK) debugging sequence, or a Quadrature Amplitude Modulation (QAM) debugging sequence.
Alternatively, the first sequence of the present application example may include a constant modulus sequence, or a complex number sequence.
The second sequence may be a BPSK modulation sequence, a QPSK modulation sequence, or a QAM modulation sequence.
Alternatively, the second sequence in this application example may include a constant modulus sequence, or a complex sequence.
Optionally, the present application example may generate an initialization sequence according to an initial value determined by the first time index, and generate the first sequence according to the initialization sequence by the sequence generator.
Optionally, in this application example, the initialization sequence may be generated according to an initial value determined by the first time index number, the sequence generator may generate a binary sequence or a BPSK sequence according to the initialization sequence, and then the binary sequence or the BPSK sequence may generate the first sequence.
Optionally, the length of the second sequence may be larger than the first sequence, and each element in the first sequence is extended to a segment in the second sequence.
Optionally, the second sequence in this application example may be a two-dimensional sequence, where one dimension corresponds to the index number of the element in the first sequence, and the other dimension corresponds to the second time index number.
Optionally, in this application example, the elements in the second sequence are a function of the elements in the first sequence and the second time index, and in the case that the second time index is determined, the elements in the second sequence correspond to the elements in the first sequence one to one.
Optionally, the second sequence corresponds to only a part of the elements in the first sequence.
Optionally, the second sequence in this application example is a two-dimensional sequence, where one dimension corresponds to the index number of the partial element in the first sequence, and the other dimension corresponds to the second time index number.
In the application example, the elements in the second sequence correspond to the REs of the second time index number; after the corresponding relationship is determined, the element to be mapped to the RE can be determined according to the RE transmitting the reference signal.
Optionally, in this application example, the elements in the second sequence correspond to REs of the second time index, where the REs of the second time index refer to REs in a time unit indicated by the second time index, and the time unit indicated by the second time index may be a frame, a slot, or an OFDM symbol.
Optionally, in this application example, the elements in the second sequence correspond to REs of the second time index number; wherein, the RE of the second time index refers to the RE satisfying the condition in the time unit indicated by the second time index, and the time unit indicated by the second time index may be a frame, a slot, or an OFDM symbol; wherein, the above condition may include:
REs within a carrier bandwidth range; or, REs within a bandwidth portion; or, configuring REs within the bandwidth range; or, all possible REs predefined by the protocol for transmitting the configured type of reference signal; or, the RE predefined by the protocol for transmitting the reference signal of the configured port; or a combination of one of the REs within the carrier bandwidth range, the REs within the bandwidth part range, the REs within the configured bandwidth range and one of the REs predefined by the protocol that may be used for transmitting reference signals of the configured type, the REs predefined by the protocol for transmitting reference signals of the configured port.
Optionally, the correspondence between the elements in the second sequence and the REs of the second time index number in this application example includes: the elements in the second sequence correspond to the RE groups of the second time index number one by one; wherein one element corresponds to one RE group.
Optionally, the correspondence between the elements in the second sequence and the REs of the second time index number in this application example includes: the elements in the second sequence correspond to one group of REs in the second time index number; wherein one element corresponds to one RE.
Optionally, in this application example, mapping a part of elements in the second sequence to REs transmitting the reference signal includes: mapping all elements in the second sequence to REs transmitting reference signals; all elements of the application example belong to one of the partial elements.
Optionally, in this application example, mapping a part of elements in the second sequence to REs transmitting the reference signal includes: mapping part of the elements in the second sequence to the REs of the transmitted reference signal, namely mapping part of the elements in the second sequence to the REs of the transmitted reference signal; and (4) partial elements.
Optionally, the first sequence generating method of the present application example includes: the first sequence is obtained by carrying out tensor product operation on two element sequences, wherein one element sequence is generated according to a first time index number;
optionally, the application example may generate an initialization sequence according to an initial value determined by the first time index, and generate one of the element sequences according to the initialization sequence by the sequence generator.
Optionally, in this application example, the initialization sequence may be generated according to an initial value determined by the first time index, the sequence generator may generate a binary sequence or a BPSK sequence according to the initialization sequence, and then generate one of the element sequences from the binary sequence or the BPSK sequence.
Optionally, in the application example, the first time index number and other parameters jointly determine an initial value, an initialization sequence is generated according to the initial value, and the sequence generator generates one of the element sequences according to the initialization sequence; other parameters of the application example may include one or more of the following parameters: one of a scrambling code identification number, an antenna port group number, a reference signal category, a quasi-common location type, a mapping location, a reference signal resource identification number, a reference signal resource set identification number, a cell number, a terminal number, and a beam number; other parameters of the present application example include, but are not limited to, the above parameters.
Optionally, the application example may generate an initialization sequence according to an initial value determined by the first time index, generate a binary pseudo-random sequence according to the initialization sequence by the sequence generator, and generate one of the element sequences from the binary pseudo-random sequence, where the element sequence is a QPSK modulation sequence.
Optionally, the present application example may determine the root sequence from the first time index number; wherein a sequence of elements is generated from a root sequence; the root sequence may be a protocol pre-defined sequence.
Optionally, in this application example, the offset of the root sequence is determined by the first time index number; determining one element sequence from the root sequence and the offset thereof; wherein, the root sequence is a sequence preset by the protocol.
Optionally, in this application example, one element sequence may be x (M) and have a length of M; wherein x is the name of the sequence, and m is the index number or sequence number of the elements in the sequence; the other element sequence is y (N) and the length is N, wherein y is the name of the sequence, and N is the index number or serial number of the element in the sequence; the first sequence is z (u) and is M N in length, wherein z is the name of the sequence and u is the index or sequence number of an element in the sequence. The first sequence z (u) is obtained by tensor product operations from the element sequences x (m), y (n) according to the following relation: an element of the sequence z (u) is the product of an element of the sequence x (M) and an element of the sequence y (N), and the element number of the sequence z (u) is a linear combination of the element number of the sequence x (M) and the element number of the sequence y (N), for example, z (M × N + N) ═ x (M) × y (N) or z (N × M + M) ═ x (M) × y (N).
Optionally, in this application example, one element sequence is x (M), and the length is M; wherein x is the name of the sequence, and m is the index number or sequence number of the elements in the sequence; the other element sequence is y (N) and the length is N, wherein y is the name of the sequence, and N is the index number or serial number of the element in the sequence; the first sequence is z (u) and is M N in length, wherein z is the name of the sequence and u is the index or sequence number of an element in the sequence. The first sequence z (u) is obtained by tensor product operations from the element sequences x (m), y (n) according to the following relation: one element of the sequence z (u) is obtained by multiplying one element of the sequence x (m) by one element of the sequence y (N), and the element number of the sequence z (u) is a linear combination of the element numbers of the sequence x (m) and the element numbers of the sequence y (N), for example, z (m × N + N) ═ x (m) × y (N); wherein the element sequence x (m) is determined by a first time index, and the element number of x (m) is increased by N for every 1 increment of the element number of z (u).
Optionally, in this application example, one element sequence is x (M), and the length is M; wherein x is the name of the sequence, and m is the index number or sequence number of the elements in the sequence; the other element sequence is y (N) and the length is N, wherein y is the name of the sequence, and N is the index number or serial number of the element in the sequence; the first sequence is z (M, N), which is a two-dimensional sequence, wherein the length of one dimension is M, the length of the other dimension is N, wherein z is the name of the sequence, M is the index number or sequence number of one dimension, and N is the index number or sequence number of the other dimension. The first sequence z (m, n) is obtained by performing tensor product operation on the element sequences x (m), y (n) according to the following relations: an element of the sequence z (m, n) is derived from the product of an element of the sequence x (m) and an element of the sequence y (n), for example z (m, n) x (m) x y (n) or z (m, n) y (n) x (m).
Optionally, in this application, two element sequences are derived from the same parent sequence, and the parent sequence is obtained according to the first time index.
Optionally, the sequence u (k) in this application example may be a parent sequence, which is obtained according to the first time index; wherein u is the name of the sequence, and k is the index number or sequence number of the element in the sequence; the elements of the sequences x (m) and y (n) are derived from the sequence u (k).
Optionally, the sequence u (k) in this application example may be a parent sequence, which is obtained according to the first time index; wherein u is the name of the sequence, and k is the index number or sequence number of the element in the sequence; the elements of sequence x (m) and sequence y (n) are derived from sequence u (k); wherein x (m) is a segment of u (k) consecutive index elements in the sequence, or y (n) is a segment of u (k) consecutive index elements in the sequence.
Optionally, the sequence u (k) in this application example may be a parent sequence, which is obtained according to the first time index; wherein u is the name of the sequence, and k is the index number or sequence number of the element in the sequence; the elements of sequence x (m) and sequence y (n) are derived from sequence u (k); wherein, the x (m) sequence and the y (n) sequence are all fragments formed by continuous sequence number elements in the u (k) sequence.
Optionally, the sequence u (k) in this application example may be a parent sequence, which is obtained according to the first time index; wherein; u is the name of the sequence, and k is the index number or sequence number of the elements in the sequence; the elements of sequence x (m) and sequence y (n) are derived from sequence u (k); the length of the x (m) sequence is the number of resource blocks included in the maximum bandwidth of the carrier, and the length of the y (n) sequence is the number of subcarriers included in a single resource block, for example, 12.
Optionally, the sequence u (k) in this application example may be a parent sequence, which is obtained according to the first time index; wherein u is the name of the sequence, and k is the index number or sequence number of the element in the sequence; the elements of sequence x (m) and sequence y (n) are derived from sequence u (k); the length of the x (m) sequence is the number of resource blocks included in the maximum bandwidth of the carrier, and the length of the y (n) sequence is the number of subcarriers occupied by a single port for transmitting the reference signal in one resource block.
Optionally, the sequence u (k) in this application example is a parent sequence, and is obtained according to the first time index number; wherein u is the name of the sequence, and k is the index number or sequence number of the element in the sequence; the elements of sequence x (m) and sequence y (n) are derived from sequence u (k); the length of the x (m) sequence is the number of resource blocks included in the maximum bandwidth of the carrier, and the length of the y (n) sequence is the number of subcarriers occupied by the port group for transmitting the reference signal in one resource block.
Optionally, the sequence u (k) in this application example is a parent sequence, and is obtained according to the first time index number; wherein u is the name of the sequence, and k is the index number or sequence number of the element in the sequence; the elements in the sequence x (m) and the sequence y (n) are from the sequence u (k), where the length of the sequence x (m) is the number of resource blocks included in the maximum bandwidth of the carrier, and the length of the sequence y (n) is the length of the orthogonal code division multiplexing of the reference signal in the frequency domain.
Optionally, in this application example, one element sequence element index corresponds to a resource block index of an RE, and the other element sequence element index corresponds to a subcarrier index of the RE.
Optionally, in the application example, an element sequence is obtained according to the first time index, where the length of the element sequence is the number of resource blocks of the RE, and the element index of the element sequence corresponds to the resource block index of the RE; the element index number of the other element sequence corresponds to the subcarrier index number of the RE.
Optionally, in the application example, an element sequence may be obtained according to the first time index, where the length of the element sequence is the number of subcarriers of the RE, and the element index of the element sequence corresponds to the subcarrier index of the RE; the element index number of the other element sequence corresponds to the resource block index number of the RE.
Optionally, the second sequence generation method in this application example may include:
the second sequence is obtained by multiplying the first sequence by a coefficient, wherein the coefficient is a function of the second time index number; the coefficient may be a QPSK modulated coefficient, a complex number, or a number with a modulus value of 1.
Optionally, the coefficients of the present application example are elements in a sequence; wherein the sequence number of the element is a function of the second time index number;
optionally, the coefficient of the present application example is an element in the sequence v (t), and the index number of the coefficient in the sequence v (t) is a function of the second time index number; where v is the name of the sequence and t is the sequence number or index number of an element in the sequence.
Optionally, the coefficient of the present application example is an element in the sequence v (t), and the index number of the coefficient in the sequence v (t) is a second time index number; where v is the name of the sequence and t is the sequence number or index number of an element in the sequence.
Optionally, the sequence element of the present application example and the first sequence element are both from the same parent sequence;
optionally, the sequence of the present application example and the first sequence are both fragments formed by consecutive elements of index numbers in the same parent sequence.
Optionally, the sequence of the present application example and the first sequence are both two different segments in the same parent sequence.
Optionally, the application example sequence element is from a first sequence; the method comprises the following steps:
the index number of the sequence element in the first sequence is a function of the second time index number;
the index number of the sequence element in the first sequence is a second time index number;
the sequence is a fragment of the first sequence;
the sequence is a segment of the first sequence starting with the element with the smallest sequence number;
the sequence is a segment of the first sequence ending with the largest sequence number element;
optionally, in the second sequence of this application example, tensor product operation is performed on the two element sequences to obtain a second sequence; wherein, an element sequence is obtained according to the first sequence and the second time index number;
optionally, in this application, the two element sequences are derived from the same parent sequence, and the parent sequence is obtained according to the first sequence and the second time index.
Optionally, in this application example, one element sequence element index corresponds to a resource block index of an RE, and the element sequence is obtained according to the first sequence and the second time index, and the other element sequence element index corresponds to a subcarrier index of the RE.
Optionally, in this application example, one of the element sequences is obtained by multiplying the first sequence by a coefficient; wherein the coefficient is a function of the second time index number.
Optionally, the correspondence between the elements in the second sequence and the REs of the second time index number in this application example is determined by the following parameters: a configured bandwidth of the reference signal.
Optionally, in this application example, the elements in the second sequence correspond to REs of the second time index number in the reference signal configuration bandwidth in a one-to-one manner, and then the REs of the second time index number in different configuration bandwidths correspond to the elements of different index numbers in the second sequence.
Optionally, in this application example, the element of the start index number in the second sequence corresponds to the start RE under the second time index number in the reference signal configuration bandwidth, and the start REs under different configuration bandwidths are different but correspond to the element of the same start index number in the second sequence.
Optionally, the correspondence between the elements in the second sequence and the REs of the second time index number in this application example is determined by the following parameters: configured reference signal pattern classes.
For example, under a first pattern category of the configured reference signal, 3 different index elements in the second sequence correspond to 3 REs under one resource block of one OFDM symbol; under the second pattern category, 4 different index number elements in the second sequence correspond to 4 REs under one resource block of one OFDM symbol; the following is illustrated by way of example, including:
under a first type pattern of the configured reference signal, 6 different index number elements in the second sequence correspond to 6 REs under one resource block of one OFDM symbol; under the configuration of a second type of pattern, 4 different index number elements in a second sequence correspond to 4 REs under one resource block of one OFDM symbol;
under a first type pattern of the configured reference signal, 6 different index number elements in the second sequence correspond to 12 REs under one resource block of one OFDM symbol; under the configuration of the second type of pattern, 4 different index number elements in the third sequence correspond to 12 REs under one resource block of one OFDM symbol;
under a first type pattern of the configured reference signal, 6 different index number elements in the second sequence correspond to 12 REs under one resource block of one OFDM symbol; under the configuration of the second type of pattern, 4 different index number elements in the third sequence correspond to 12 REs under one resource block of one OFDM symbol;
optionally, in the application example, for the reference signals of the same name port, the RE positions corresponding to the elements in the second sequence under the first pattern category are different from the RE positions corresponding to the elements in the second sequence under the second pattern category.
Optionally, for the reference signals of the ports with the same sequence number, the RE positions corresponding to the elements in the second sequence under the first pattern type are different from the RE positions corresponding to the elements in the second sequence under the second pattern type.
Optionally, in this application example, the element in the second sequence corresponds to the RE of the second time index number: every 12 elements corresponds to an RE on one PRB for one OFDM symbol.
Optionally, in this application example, the port group index number or the port group identifier number is combined with the first time index number to determine an initial value of the first sequence;
optionally, in this application, the second sequence and the first sequence belong to the same type of modulation sequence.
For example, the second sequence and the first sequence are both QPSK modulated; or, the second sequence and the first sequence are both BPSK modulated; or, the second sequence and the first sequence are both QAM modulated.
It will be understood by those skilled in the art that all or part of the steps of the above methods may be implemented by a program instructing associated hardware (e.g., a processor) to perform the steps, and the program may be stored in a computer readable storage medium, such as a read only memory, a magnetic or optical disk, and the like. Alternatively, all or part of the steps of the above embodiments may be implemented using one or more integrated circuits. Accordingly, each module/unit in the above embodiments may be implemented in hardware, for example, by an integrated circuit to implement its corresponding function, or in software, for example, by a processor executing a program/instruction stored in a memory to implement its corresponding function. The present invention is not limited to any specific form of combination of hardware and software.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (14)
1. A method of transmitting a reference signal, comprising:
generating a first sequence according to an initial value of the first sequence determined by the first time index number;
generating a second sequence from the first sequence and the second time index number;
mapping part of elements in the second sequence to Resource Elements (RE) for transmitting the reference signals according to the corresponding relation;
wherein the elements in the second sequence correspond to REs of the second time index;
the generating the second sequence comprises:
multiplying the first sequence by a preset coefficient to generate the second sequence, wherein the preset coefficient comprises a function of the second time index number; or,
and carrying out tensor product operation on the two element sequences to obtain the second sequence, wherein one element sequence is generated according to the first sequence and the second time index number.
2. The method of claim 1, wherein generating the first sequence comprises:
performing tensor product operation on the two element sequences to generate the first sequence;
wherein one of the two element sequences is generated according to the first time index number.
3. The method of claim 2,
both of the two element sequences are derived from the same parent sequence;
wherein the parent sequence is obtained according to the first temporal index number.
4. The method of claim 2, wherein in the two sequences of elements:
the element index number of one element sequence corresponds to the resource block index number of the RE;
the element index number of the other one of the element sequences corresponds to the subcarrier index number of the RE.
5. The method of claim 1, wherein the preset coefficients comprise:
presetting elements in a sequence;
wherein the sequence numbers of the elements in the preset sequence are a function of the second time index number.
6. The method of claim 5, wherein the elements in the predetermined sequence and the elements of the first sequence are from the same parent sequence.
7. The method of claim 5, wherein the elements in the predetermined sequence are from the first sequence.
8. The method of claim 1, wherein the correspondence between the elements in the second sequence and the REs of the second time index is established according to at least one of the following ways:
determining according to the bandwidth of the configuration reference signal;
determining according to the pattern category of the configuration reference signal;
and according to each 12 elements in the second sequence, corresponding to RE on one resource block of one orthogonal frequency division multiplexing OFDM symbol.
9. The method of claim 1, 2, 3 or 4, wherein the initial value determined from the first time index comprises:
and determining the initial value of the first sequence according to the port group index number or the port group identification number and the first time index number.
10. An apparatus for transmitting a reference signal, comprising: a first generating unit, a second generating unit and a mapping unit; wherein,
the first generating unit is used for: generating a first sequence according to an initial value of the first sequence determined by the first time index number;
the second generating unit is used for: generating a second sequence from the first sequence and a second time index number;
the mapping unit is used for: mapping part of elements in the second sequence to Resource Elements (RE) for transmitting the reference signals according to the corresponding relation;
wherein the elements in the second sequence correspond to REs of the second time index;
the second generating unit is specifically configured to:
multiplying the first sequence by a preset coefficient to generate a second sequence; wherein the preset coefficients include: a function of the second time index number; or,
carrying out tensor product operation according to the two element sequences to obtain the second sequence; wherein a sequence of elements is generated from the first sequence and the second time index number.
11. The apparatus according to claim 10, wherein the first generating unit is specifically configured to:
performing tensor product operation on the two element sequences to generate the first sequence; wherein one of the two element sequences is generated according to the first time index number;
determining an initial value of the first sequence according to the port group index number or the port group identification number and the first time index number in a combined manner; generating the first sequence according to the determined initial value.
12. The apparatus of claim 10, wherein the correspondence between the elements in the second sequence and the REs of the second time index is established according to at least one of:
determining according to the bandwidth of the configuration reference signal;
determining according to the pattern category of the configuration reference signal;
and according to each 12 elements in the second sequence, corresponding to RE on one resource block of one orthogonal frequency division multiplexing OFDM symbol.
13. A computer storage medium having stored thereon computer-executable instructions for performing the method of any one of claims 1-9.
14. A terminal, comprising: a memory and a processor; wherein,
the processor is configured to execute program instructions in the memory;
the program instructions read on the processor to perform the following operations:
generating a first sequence according to an initial value of the first sequence determined by the first time index number;
generating a second sequence from the first sequence and a second time index number;
mapping part of elements in the second sequence to Resource Elements (RE) for transmitting the reference signals according to the corresponding relation;
wherein the elements in the second sequence correspond to REs of the second time index;
the generating the second sequence comprises:
multiplying the first sequence by a preset coefficient to generate the second sequence, wherein the preset coefficient comprises a function of the second time index number; or,
and carrying out tensor product operation on the two element sequences to obtain the second sequence, wherein one element sequence is generated according to the first sequence and the second time index number.
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