CN114079555A

CN114079555A - Signal transmission method and device

Info

Publication number: CN114079555A
Application number: CN202110286619.3A
Authority: CN
Inventors: 余健; 郭志恒; 苏立焱; 陆绍中; 余雅威
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2020-08-14
Filing date: 2021-03-17
Publication date: 2022-02-22

Abstract

A signal transmission method and apparatus. The method comprises the following steps: the sending equipment generates a sequence of the demodulation reference signal, maps the sequence of the demodulation reference signal to a time frequency resource of the demodulation reference signal and sends the sequence. The demodulation reference signal is used for estimating a channel state of a first channel, and the first channel is used for carrying uplink data. The time frequency resources comprise frequency domain resources corresponding to a first CDM group, and the frequency domain resources corresponding to the first CDM group are discontinuous and arranged at equal intervals; the first PRB in the frequency domain resource corresponding to the first CDM group includes a first group of subcarriers and a second group of subcarriers, where the first group of subcarriers and the second group of subcarriers include 2 subcarriers, the first group of subcarriers corresponds to a first group of OCCs, the second group of subcarriers corresponds to a second group of OCCs, and the first group of OCCs is orthogonal to the second group of OCCs.

Description

Signal transmission method and device

Cross Reference to Related Applications

The present application claims priority from chinese patent application filed on 14/8/2020 and entitled "signal transmission method and apparatus" by the chinese patent office, application number 202010821303.5, the entire contents of which are incorporated by reference into this disclosure.

Technical Field

The present application relates to the field of mobile communications technologies, and in particular, to a signal transmission method and apparatus.

Background

In fourth generation (4G) and fifth generation (5G) wireless communication systems, new radio access technology (NR) systems, demodulation reference signals (DMRSs) are defined for channel estimation and Physical Uplink Shared Channel (PUSCH) data demodulation.

The DMRS sequence generation method is related to the waveform configuration used. In the NR system, two waveforms are supported, namely, a cyclic prefix-based orthogonal frequency division multiplexing (CP-OFDM) and a discrete fourier transform-spread-orthogonal frequency division multiplexing (DFT-S-OFDM) waveform based on discrete fourier transform extension.

In the current NR protocol, the DFT-S-OFDM waveform can support 8 orthogonal DMRS ports at most, namely 8 layers of multi-user orthogonal pairing, and the CP-OFDM waveform can support 12 orthogonal DMRS ports at most, namely 12 layers of multi-user orthogonal pairing. If the number of pairing layers exceeds the maximum supportable number of multiuser orthogonal pairing layers of a corresponding waveform (for example, the number of pairing layers exceeds 8 when a DFT-S-OFDM waveform is adopted, or the number of pairing layers exceeds 12 when a CP-OFDM waveform is adopted), the DMRS ports cannot be orthogonal, so that pilot interference is introduced, channel estimation of the DMRS is inaccurate, and demodulation performance of the PUSCH is affected.

With the development of mobile communications and the emergence of emerging services, the demand for uplink capacity is increasing. For example, for some video monitoring scenes, a terminal device is required to transmit a high-definition video back to a base station, and the number of layers transmitted at the same time needs to be higher than the maximum number of layers of multi-user orthogonal pairing supported by the current system, so that transmission capacity is improved, and the requirement of future high capacity is met.

Disclosure of Invention

The embodiment of the application provides a signal transmission method and a signal transmission device, so as to improve transmission capacity.

In a first aspect, a signal transmission method is provided, including:

the transmitting device generates a sequence of demodulation reference signals, wherein the demodulation reference signals are used for estimating the channel state of a first channel;

the sending equipment maps the sequence of the demodulation reference signal to the time-frequency resource of the demodulation reference signal for sending; the time frequency resources comprise frequency domain resources corresponding to a first Code Division Multiplexing (CDM) group, wherein the frequency domain resources corresponding to the first CDM group are not continuous and are arranged at equal intervals; a first Physical Resource Block (PRB) in frequency domain resources corresponding to the first CDM group comprises a first group of subcarriers and a second group of subcarriers; the first group of subcarriers and the second group of subcarriers respectively include 2 subcarriers, the first group of subcarriers corresponds to a first group of orthogonal spreading codes (OCCs), the second group of subcarriers corresponds to a second group of OCCs, and the first group of OCCs is orthogonal to the second group of OCCs.

In the foregoing embodiment of the present application, the subcarriers on the first PRB in the frequency domain resource corresponding to the first CDM group are divided into a first group of subcarriers and a second group of subcarriers, so that the first group of subcarriers corresponds to the first group of OCCs, the second group of subcarriers corresponds to the second group of OCCs, and the first group of OCCs and the second group of OCCs are orthogonal. Because different demodulation reference signal ports in the first CDM group are guaranteed to be orthogonal to each other by the OCC, the number of the mutually orthogonal demodulation reference signal ports in the first CDM group can be increased by expanding the OCC according to the embodiment of the present application without additionally increasing the time-frequency resource overhead of the demodulation reference signal, and thus the transmission capacity of the system can be increased.

In one possible design, the first PRB further includes a third set of subcarriers including 2 subcarriers, the third set of subcarriers corresponding to the first set of OCCs.

In one possible design, the configuration information table of the demodulation reference signal includes a mapping relationship between a port index of the demodulation reference signal, a CDM group frequency domain offset, and an OCC, where the OCC includes a frequency domain OCC and a time domain OCC, and the frequency domain OCC includes a first group OCC and a second group OCC.

In the foregoing embodiment of the present application, by expanding the configuration information table of the demodulation reference signal, that is, expanding the frequency domain OCC in the configuration information table into the first group of OCCs and the second group of OCCs that are orthogonal to each other, when querying the time domain OCC and the frequency domain OCC according to the configuration information table so as to map the demodulation reference signal sequence onto the corresponding time frequency resource, the first group of OCCs can be used by the first group of subcarriers on the first PRB in the frequency domain resource corresponding to the first CDM group, and the second group of subcarriers can be used by the second group of OCCs, so as to ensure orthogonality between the demodulation reference signal mapped onto the first group of subcarriers and the demodulation reference signal mapped onto the second group of subcarriers.

In one possible design, the configuration information table of the demodulation reference signal includes a first configuration information table and a second configuration information table;

the first configuration information table comprises a corresponding relation of a demodulation reference signal port index, a CDM group frequency domain offset and an OCC, and the OCC comprises a frequency domain OCC and a time domain OCC;

the second information configuration table comprises a corresponding relation of demodulation reference signal port indexes, CDM group frequency domain offset and OCC, the OCC comprises a frequency domain OCC and a time domain OCC, the frequency domain OCC comprises a first group of OCC and a second group of OCC, and the second configuration information table is different from the demodulation reference signal port indexes in the first configuration information table.

In the above embodiment of the present application, the configuration information table of the demodulation reference signal is expanded, that is, expanded into the first configuration information table and the second configuration information table, and the frequency domain OCC in the second configuration information table is expanded into the first group of OCCs and the second group of OCCs that are orthogonal to each other, so that when the time domain OCC and the frequency domain OCC are queried according to the first configuration information table and the second configuration information table so as to map the demodulation reference signal sequence onto the corresponding time frequency resource, the corresponding configuration information table can be queried according to different demodulation reference signal port indexes, so that the first group of subcarriers on the first PRB in the frequency domain resource corresponding to the first CDM group uses the first group of OCCs, and the second group of subcarriers uses the second group of OCCs, so as to ensure orthogonality between the demodulation reference signals mapped onto the first group of subcarriers and the demodulation reference signals mapped onto the second group of subcarriers.

In one possible design, the method further comprises: and the sending equipment acquires a first group of OCCs corresponding to the first group of subcarriers and a second group of OCCs corresponding to the second group of subcarriers according to the configuration information table.

In one possible design, the mapping, by the sending device, the sequence of the demodulation reference signals to time-frequency resources of the demodulation reference signals includes:

The sending device obtains a CDM group frequency domain offset, a frequency domain OCC and a time domain OCC corresponding to a first RE (k, l) according to the configuration information table, wherein a subcarrier index of the first RE (k, l) in the time-frequency resource is k, and a symbol index is l;

obtaining data of the sequence mapping of the demodulation reference signal on the first RE (k, l) according to the CDM group frequency domain offset, the frequency domain OCC and the time domain OCC

The data mapped on the first RE (k, l)

Satisfies the following conditions:

k＝4n+2k′+Δ

k′＝0，1

t＝mod(n，2)

n＝0，1，…

j＝0，1，…，v-1

wherein, W_f(k' +2t) is the frequency domain OCC, W_t(l ') is a time domain OCC, and r (2n + k') is an initial sequence of the demodulation reference signal; Δ is the CDM group frequency domain offset; wherein,

an index of a starting symbol of the demodulation reference signal, l' is a symbol offset of the demodulation reference signal, and v is a transmission layer number; wherein, when t is 0, the frequency domain OCC is a first group OCC; t is 1, and the frequency domain OCC is a second group OCC.

In the embodiments of the present application, the mapping formula of the demodulation reference signal may be used in conjunction with the extended demodulation reference signal configuration information table in the embodiments to implement mapping of the demodulation reference signal to the time-frequency resource, and may ensure orthogonality of each demodulation reference signal port in the first CDM group.

In one possible design, the method further comprises: the transmitting device transmits indication information of the demodulation reference signal port index in the first CDM group to a receiving device.

In one possible design, a maximum number of demodulation reference signal ports included in the first CDM group is at least 4N, where N is a number of symbols occupied by the demodulation reference signal.

The above-described embodiments of the present application may increase the number of demodulation reference signal ports that can be included within the first CDM group to at least 4N. For example, when the embodiment of the present application is applied to a DMRS configured with a Type of Type 1 DMRS, one CDM group may support 8 DMRS ports to be orthogonal and 2 CDM groups may support 16 DMRS ports to be orthogonal without increasing DMRS overhead, so that 16-layer orthogonal multi-user pairing is implemented, and system capacity is effectively improved.

In a second aspect, a signal transmission method is provided, including:

the sending equipment maps the sequence of the demodulation reference signal to the time-frequency resource of the demodulation reference signal for sending; the time frequency resources comprise frequency domain resources corresponding to a first CDM group, wherein the frequency domain resources corresponding to the first CDM group are not continuous and are arranged at equal intervals; the time domain resources corresponding to the first CDM group include a first set of symbols and a second set of symbols, the first set of symbols corresponds to a first set of OCCs, the second set of symbols corresponds to a second set of OCCs, and the first set of OCCs is orthogonal to the second set of OCCs.

In the foregoing embodiment of the present application, the time domain resources corresponding to the first CDM group are divided into a first group of symbols and a second group of symbols, and the first group of symbols corresponds to the first group of OCCs, the second group of symbols corresponds to the second group of OCCs, and the first group of OCCs and the second group of OCCs are orthogonal. Because different demodulation reference signal ports in the first CDM group are guaranteed to be orthogonal to each other by the OCC, the number of the mutually orthogonal demodulation reference signal ports in the first CDM group can be increased by expanding the OCC according to the embodiment of the present application without additionally increasing the time-frequency resource overhead of the demodulation reference signal, and thus the transmission capacity of the system can be increased.

In one possible design, the configuration information table of the demodulation reference signal includes a correspondence relationship between a demodulation reference signal type, a demodulation reference signal port index, a CDM group frequency domain offset, and an OCC, where the OCC includes a frequency domain OCC and a time domain OCC, the time domain OCC includes a first group of OCCs and a second group of OCCs, the first group of OCCs corresponds to the first demodulation reference signal type, the second group of OCCs corresponds to the second demodulation reference signal type, the first demodulation reference signal type corresponds to the first group of symbols, and the second demodulation reference signal type corresponds to the second group of symbols.

In the foregoing embodiment of the present application, by expanding the configuration information table of the demodulation reference signal, that is, expanding the time domain OCC in the configuration information table into the first group of OCCs and the second group of OCCs that are orthogonal to each other, when querying the time domain OCC and the frequency domain OCC according to the configuration information table so as to map the demodulation reference signal sequence onto the corresponding time frequency resource, the first group of symbols in the time domain resource corresponding to the first CDM group can use the first group of OCCs, and the second group of symbols uses the second group of OCCs, so as to ensure orthogonality between the demodulation reference signal mapped onto the first group of symbols and the demodulation reference signal mapped onto the second group of symbols.

In one possible design, the configuration information table of the demodulation reference signal includes a first configuration information table and a second configuration information table, the first configuration information table corresponds to a first demodulation reference signal type, the second configuration information table corresponds to a second demodulation reference signal type, the first demodulation reference signal type corresponds to the first set of symbols, and the second demodulation reference signal type corresponds to the second set of symbols;

the first configuration information table comprises a corresponding relation among a demodulation reference signal port index, a CDM group frequency domain offset and an OCC, the OCC comprises a frequency domain OCC and a time domain OCC, and the time domain OCC is the first group of OCCs;

The second information configuration table comprises a corresponding relation of a demodulation reference signal port index, a CDM group frequency domain offset and an OCC, the OCC comprises a frequency domain OCC and a time domain OCC, and the time domain OCC is the second group of OCCs.

In the above embodiments of the present application, the configuration information table of the demodulation reference signal is extended, that is, extended into a first configuration information table and a second configuration information table, where the first configuration information table and the second configuration information table correspond to different demodulation reference signal types (different demodulation reference signal types are associated with different symbol groups), the time domain OCC in the first configuration information table is a first group of OCCs, and the time domain OCC in the second configuration information table is a second group of OCCs, so that when the time domain OCC and the frequency domain OCC are queried according to the first configuration information table and the second configuration information table so as to map the demodulation reference signal sequence onto corresponding time frequency resources, different configuration information tables can be queried according to different demodulation reference signal types, specifically, the first configuration information table is queried according to the first demodulation reference signal type to obtain the first group of OCCs for the first group of symbols, and querying a second configuration information table according to the first demodulation reference signal type to obtain a second group of OCCs to be used for a second group of symbols so as to ensure the orthogonality of the demodulation reference signals mapped on the first group of symbols and the demodulation reference signals mapped on the second group of symbols.

In one possible design, the configuration information table of the demodulation reference signal includes a correspondence relationship between a demodulation reference signal type, a demodulation reference signal port index, a CDM group frequency domain offset, and an OCC, where the OCC includes a frequency domain OCC and a time domain OCC, the frequency domain OCC includes a first group of OCCs and a second group of OCCs, the first group of OCCs corresponds to the first demodulation reference signal type, the second group of OCCs corresponds to the second demodulation reference signal type, the first demodulation reference signal type corresponds to the first group of symbols, and the second demodulation reference signal type corresponds to the second group of symbols.

In the foregoing embodiment of the present application, by expanding the configuration information table of the demodulation reference signal, that is, expanding the frequency domain OCC in the configuration information table into the first group of OCCs and the second group of OCCs that are orthogonal to each other, when querying the time domain OCC and the frequency domain OCC according to the configuration information table so as to map the demodulation reference signal sequence onto the corresponding time frequency resource, the first group of symbols in the time domain resource corresponding to the first CDM group can use the first group of OCCs, and the second group of symbols uses the second group of OCCs, so as to ensure orthogonality between the demodulation reference signal mapped onto the first group of symbols and the demodulation reference signal mapped onto the second group of symbols.

the first configuration information table comprises a corresponding relation among a demodulation reference signal port index, a CDM group frequency domain offset and an OCC, the OCC comprises a frequency domain OCC and a time domain OCC, and the frequency domain OCC is the first group of OCCs;

the second information configuration table includes a corresponding relationship among a demodulation reference signal port index, a CDM group frequency domain offset, and an OCC, the OCC includes a frequency domain OCC and a time domain OCC, and the frequency domain OCC is the second group OCC.

In the above embodiments of the present application, the configuration information table of the demodulation reference signal is extended, that is, extended into a first configuration information table and a second configuration information table, where the first configuration information table and the second configuration information table correspond to different demodulation reference signal types (different demodulation reference signal types are associated with different symbol groups), the frequency domain OCC in the first configuration information table is a first group OCC, and the frequency domain OCC in the second configuration information table is a second group OCC, so that, when querying the time domain OCC and the frequency domain OCC according to the first configuration information table and the second configuration information table to map the demodulation reference signal sequence to the corresponding time frequency resource, different configuration information tables can be queried according to different demodulation reference signal types, specifically, the first configuration information table is queried according to the first demodulation reference signal type to obtain the first group OCC for the first group of symbols, and querying a second configuration information table according to the first demodulation reference signal type to obtain a second group of OCCs to be used for a second group of symbols so as to ensure the orthogonality of the demodulation reference signals mapped on the first group of symbols and the demodulation reference signals mapped on the second group of symbols.

In one possible design, the method further comprises: and the sending equipment obtains a first group of OCCs corresponding to the first group of symbols and a second group of OCCs corresponding to the second group of symbols according to the configuration information table and the demodulation reference signal type.

The data mapped on the first RE (k, l)

Satisfies the following conditions:

k＝4n+2k′+Δ

k′＝0，1

s＝0，1

n＝0，1，…

j＝0，1，…，v-1

wherein, W_f(k') is the frequency domain OCC, W_t(1 ') is a time domain OCC, and r (2n + k') is an initial sequence of the demodulation reference signal; Δ is the CDM group frequency domain offset; wherein,

an index of a starting symbol of the demodulation reference signal, l' is a symbol offset of the demodulation reference signal, and v is a transmission layer number; wherein when s is 0, the time domain OCC is a first group OCC; s is 1, and the time domain OCC is a second group OCC.

The data mapped on the first RE (k, l)

Satisfies the following conditions:

k＝4n+2k′+Δ

k′＝0，1

s＝0，1

n＝0，1，…

j＝0，1，…，v-1

is an index of a starting symbol of the demodulation reference signal, l' is a symbol offset of the demodulation reference signal, v is The number of transmission layers; wherein, when s is 0, the frequency domain OCC is a first group OCC; s is 1, and the frequency domain OCC is a second group OCC.

In one possible design, the method further comprises: and the sending equipment sends the port index indication information of the demodulation reference signal to a terminal.

In one possible design, a maximum number of demodulation reference signal ports included in the first CDM group is at least 4N, where N is a number of symbols included in the first or second set of symbols, and the first and second sets of symbols include the same number of symbols.

In a third aspect, a signal transmission method is provided, including:

the sending equipment maps the sequence of the demodulation reference signal to the time-frequency resource of the demodulation reference signal for sending;

wherein:

the time-frequency resources comprise frequency domain resources corresponding to a first port of a demodulation reference signal and a second port of the demodulation reference signal in a first CDM group, the frequency domain resources corresponding to the first port are the same as the frequency domain resources corresponding to the second port, the frequency domain resources corresponding to the first port and the frequency domain resources corresponding to the second port are arranged discontinuously and at equal intervals, a first PRB in the frequency domain resources corresponding to the first port and the frequency domain resources corresponding to the second port comprises at least two subcarrier groups, each of the at least two subcarrier groups comprises two subcarriers, and the at least two subcarrier groups comprise a first subcarrier group and a second subcarrier group or comprise a first subcarrier group, a second subcarrier group and a third subcarrier group;

orthogonal spreading OCC codes used by the frequency domain resources corresponding to the first port on REs corresponding to all subcarriers in the at least two subcarrier groups form a first OCC code sequence, OCC codes used by the frequency domain resources corresponding to the second port on REs corresponding to all subcarriers in the at least two subcarrier groups form a second OCC code sequence, OCC codes used by the frequency domain resources corresponding to the first port or the second port on REs corresponding to two subcarriers in the first subcarrier group form a third OCC code sequence, and OCC codes used on REs corresponding to two subcarriers in the second subcarrier group form a fourth OCC code sequence; wherein the second OCC code sequence is obtained by performing cyclic shift based on the first OCC code sequence, and the third OCC code sequence is different from the fourth OCC code sequence.

In the above embodiment of the present application, the OCC used by the frequency domain resource corresponding to the first port of the demodulation reference signal in the first CDM group on the RE corresponding to the subcarrier group forms the first OCC code sequence, the OCC used by the frequency domain resource corresponding to the second port of the demodulation reference signal in the first CDM group on the RE corresponding to the subcarrier group forms the second OCC code sequence, and the second OCC code sequence is obtained by cyclically shifting the first OCC code sequence, so that the OCCs of the demodulation reference signal ports can be cyclically shifted to obtain orthogonal OCCs, and the OCC code sequences obtained by cyclically shifting are used for another demodulation reference signal port, because different demodulation reference signal ports in the first CDM group are guaranteed to be orthogonal to each other by the OCCs, the OCCs can be spread by the above embodiment of the present application, without additionally increasing the time-frequency resource overhead of the demodulation reference signal, the number of the mutually orthogonal demodulation reference signal ports in the first CDM group is increased, and the transmission capacity of the system can be further increased.

In one possible design, the configuration information table of the demodulation reference signal includes a correspondence relationship between a demodulation reference signal port index, a CDM group frequency domain offset, an OCC, and a cyclic shift factor, where the OCC includes a frequency domain OCC and a time domain OCC.

In the foregoing embodiment of the present application, the configuration information table of the demodulation reference signal is expanded, that is, a cyclic shift factor is introduced into the configuration information table, so that when the time domain OCC and the frequency domain OCC are queried according to the configuration information table so as to map the demodulation reference signal sequence to the corresponding time-frequency resource, the cyclic shift factor corresponding to the demodulation reference signal port index can be used to perform cyclic shift on the OCC corresponding to the demodulation reference signal port index so as to obtain an orthogonal OCC, thereby ensuring orthogonality between the demodulation reference signal ports in the first CDM group.

In one possible design, the method further comprises: and the sending equipment acquires the frequency domain OCC, the time domain OCC and the cyclic shift factor corresponding to the demodulation reference signal port index according to the configuration information table, and performs cyclic shift on the acquired frequency domain OCC and time domain OCC according to the acquired cyclic shift factor.

the sending device obtains a CDM group frequency domain offset, a frequency domain OCC, a time domain OCC, and a cyclic shift factor corresponding to a first RE (k, l) according to the configuration information table, wherein a subcarrier index of the first RE (k, l) in the time-frequency resource is k, and a symbol index is l;

Obtaining data of the sequence mapping of the demodulation reference signal on the first RE (k, l) according to the CDM group frequency domain offset, the frequency domain OCC, the time domain OCC and the cyclic shift factor

The data mapped on the first RE (k, l)

Satisfies the following conditions:

k＝4n+2k′+Δ

k′＝0，1

n＝0，1，…

j＝0，1，…，v-1

or, the data mapped on the first RE (k, l)

Satisfies the following conditions:

k＝4n+2k′+Δ

k′＝0，1

n＝0，1，…

j＝0，1，…，v-1

wherein, W_f(k') is frequencyDomain OCC, W_t(1 ') is a time domain OCC, and r (2n + k') is an initial sequence of the demodulation reference signal; Δ is the CDM group frequency domain offset; wherein,

the index of the starting symbol of the demodulation reference signal, l' is the symbol offset of the demodulation reference signal, v is the number of transmission layers, phi is a cyclic shift factor, and M is a positive integer greater than or equal to 1.

The above-described embodiments of the present application may increase the number of demodulation reference signal ports that can be included within the first CDM group to at least 4N. For example, when the embodiment of the present application is applied to a DMRS configured with a Type of Type 1 DMRS, one CDM group may support 8 DMRS ports to be orthogonal and 2 CDM groups may support 16 DMRS ports to be orthogonal without increasing DMRS overhead, so that 16-layer orthogonal multi-user pairing is implemented, and system capacity is effectively improved. For another example, when the embodiment of the present application is applied to a DMRS configured with a Type of Type 1 DMRS, one CDM group may support 12 DMRS ports to be orthogonal and 2 CDM groups may support 24 DMRS ports to be orthogonal without increasing DMRS overhead, so that 24-layer orthogonal multi-user pairing is implemented, and system capacity is effectively improved.

In a fourth aspect, a signal transmission method is provided, including:

the method comprises the steps that a receiving device receives a demodulation reference signal sent by a sending device on a time-frequency resource of the demodulation reference signal, wherein the demodulation reference signal is used for estimating a channel state of a first channel; the time frequency resources comprise frequency domain resources corresponding to a first CDM group, wherein the frequency domain resources corresponding to the first CDM group are not continuous and are arranged at equal intervals; a first PRB in the frequency domain resource corresponding to the first CDM group comprises a first group of subcarriers and a second group of subcarriers; the first group of subcarriers and the second group of subcarriers respectively comprise 2 subcarriers, the first group of subcarriers corresponds to a first group of OCCs, the second group of subcarriers corresponds to a second group of OCCs, and the first group of OCCs is orthogonal to the second group of OCCs;

The receiving device obtains the sequence of the demodulation reference signals.

In one possible design, the method further comprises: and the receiving equipment acquires a first group of OCCs corresponding to the first group of subcarriers and a second group of OCCs corresponding to the second group of subcarriers according to the configuration information table.

In one possible design, the receiving device obtains the sequence of demodulation reference signals, including:

the receiving device obtains a CDM group frequency domain offset, a frequency domain OCC and a time domain OCC corresponding to a first RE (k, l) according to the configuration information table, wherein a subcarrier index of the first RE (k, l) in the time-frequency resource is k, and a symbol index is l;

The data mapped on the first RE (k, l)

Satisfies the following conditions:

k＝4n+2k′+Δ

k′＝0，1

t＝mod(n，2)

n＝0，1，…

j＝0，1，…，v-1

is the index of the starting symbol of the demodulation reference signal, l' is the symbol offset of the demodulation reference signal, v is the symbol offset of the demodulation reference signalThe number of the layer is conveyed; wherein, when t is 0, the frequency domain OCC is a first group OCC; t is 1, and the frequency domain OCC is a second group OCC.

In one possible design, the method further comprises: the receiving device receives indication information of the demodulation reference signal port index in the first CDM group sent by the sending device.

In a fifth aspect, a signal transmission method is provided, including:

the method comprises the steps that a receiving device receives a demodulation reference signal sent by a sending device on a time-frequency resource of the demodulation reference signal, wherein the demodulation reference signal is used for estimating a channel state of a first channel; the time frequency resources comprise frequency domain resources corresponding to a first CDM group, wherein the frequency domain resources corresponding to the first CDM group are not continuous and are arranged at equal intervals; the time domain resources corresponding to the first CDM group comprise a first group of symbols and a second group of symbols, the first group of symbols corresponds to a first group of OCCs, the second group of symbols corresponds to a second group of OCCs, and the first group of OCCs is orthogonal to the second group of OCCs;

In one possible design, the method further comprises: and the receiving equipment obtains a first group of OCCs corresponding to the first group of symbols and a second group of OCCs corresponding to the second group of symbols according to the configuration information table and the demodulation reference signal type.

The data mapped on the first RE (k, l)

Satisfies the following conditions:

k＝4n+2k′+Δ

k′＝0.1

s＝0，1

n＝0，1，…

j＝0，1，…，v-1

wherein, W_f(k') is the frequency domain OCC, W_t(l ') is a time domain OCC, and r (2n + k') is an initial sequence of the demodulation reference signal; Δ is the CDM group frequency domain offset; wherein,

The data mapped on the first RE (k, l)

Meets the requirements;

k＝4n+2k′+Δ

k′＝0，1

s＝0，1

n＝0，1，…

j＝0，1，…，v-1

an index of a starting symbol of the demodulation reference signal, l' is a symbol offset of the demodulation reference signal, and v is a transmission layer number; wherein, when s is 0, the frequency domain OCC is a first group OCC; s is 1, and the frequency domain OCC is a second group OCC.

In one possible design, the method further comprises: and the receiving equipment receives port index indication information of the demodulation reference signal sent by the sending equipment.

In a sixth aspect, a signal transmission method is provided, including:

The method comprises the steps that a receiving device receives a demodulation reference signal sent by a sending device on a time-frequency resource of the demodulation reference signal, wherein the demodulation reference signal is used for estimating a channel state of a first channel;

the receiving device obtains the sequence of the demodulation reference signals;

wherein:

In one possible design, the method further comprises: and the receiving equipment acquires the frequency domain OCC, the time domain OCC and the cyclic shift factor corresponding to the demodulation reference signal port index according to the configuration information table, and performs cyclic shift on the acquired frequency domain OCC and time domain OCC according to the acquired cyclic shift factor.

the receiving device obtains a CDM group frequency domain offset, a frequency domain OCC, a time domain OCC and a cyclic shift factor corresponding to a first RE (k, l) according to the configuration information table, wherein a subcarrier index of the first RE (k, l) in the time-frequency resource is k, and a symbol index is l;

The mapping is at the premises Data on the first RE (k, l)

Satisfies the following conditions:

k＝4n+2k′+Δ

k′＝0，1

n＝0，1，…

j＝0，1，…，v-1

or, the data mapped on the first RE (k, l)

Satisfies the following conditions:

k＝4n+2k′+Δ

k′＝0，1

n＝0，1，…

j＝0，1，…，v-1

In a seventh aspect, there is provided a communication apparatus comprising at least one processor coupled to a memory, the at least one processor configured to read and execute a program stored in the memory to cause the apparatus to perform:

generating a sequence of demodulation reference signals, the demodulation reference signals being used for estimating a channel state of a first channel;

Mapping the sequence of the demodulation reference signal to a time frequency resource of the demodulation reference signal for transmission; the time frequency resources comprise frequency domain resources corresponding to a first Code Division Multiplexing (CDM) group, wherein the frequency domain resources corresponding to the first CDM group are not continuous and are arranged at equal intervals; a first Physical Resource Block (PRB) in frequency domain resources corresponding to the first CDM group comprises a first group of subcarriers and a second group of subcarriers; the first group of subcarriers and the second group of subcarriers respectively include 2 subcarriers, the first group of subcarriers corresponds to a first group of orthogonal spreading codes (OCCs), the second group of subcarriers corresponds to a second group of OCCs, and the first group of OCCs is orthogonal to the second group of OCCs.

In one possible design, the method further comprises: and obtaining a first group of OCCs corresponding to the first group of subcarriers and a second group of OCCs corresponding to the second group of subcarriers according to the configuration information table.

In one possible design, the mapping the sequence of the demodulation reference signal to the time-frequency resource of the demodulation reference signal includes:

obtaining a CDM group frequency domain offset, a frequency domain OCC and a time domain OCC corresponding to a first RE (k, l) according to the configuration information table, wherein a subcarrier index of the first RE (k, l) in the time-frequency resource is k, and a symbol index is l;

The data mapped on the first RE (k, l)

Satisfies the following conditions:

k＝4n+2k′+Δ

k′＝0，1

t＝mod(n，2)

n＝0，1，…

j＝0，1，…，v-1

In one possible design, the method further comprises: and sending indication information of the demodulation reference signal port index in the first CDM group to a receiving device.

In an eighth aspect, there is provided a communication apparatus comprising at least one processor coupled to a memory, the at least one processor configured to read and execute a program stored in the memory to cause the apparatus to perform:

mapping the sequence of the demodulation reference signal to a time frequency resource of the demodulation reference signal for transmission; the time frequency resources comprise frequency domain resources corresponding to a first CDM group, wherein the frequency domain resources corresponding to the first CDM group are not continuous and are arranged at equal intervals; the time domain resources corresponding to the first CDM group include a first set of symbols and a second set of symbols, the first set of symbols corresponds to a first set of OCCs, the second set of symbols corresponds to a second set of OCCs, and the first set of OCCs is orthogonal to the second set of OCCs.

In one possible design, the method further comprises: and obtaining a first group of OCCs corresponding to the first group of symbols and a second group of OCCs corresponding to the second group of symbols according to the configuration information table and the type of the demodulation reference signal.

In one possible design, mapping the sequence of the demodulation reference signal to a time-frequency resource of the demodulation reference signal includes:

frequency domain biasing according to the CDM groupShifting the frequency domain OCC and the time domain OCC to obtain data of the sequence mapping of the demodulation reference signal on the first RE (k, l)

The data mapped on the first RE (k, l)

Satisfies the following conditions:

k＝4n+2k′+Δ

k′＝0，1

s＝0，1

n＝0，1，…

j＝0，1，…，v-1

The data mapped on the first RE (k, l)

Satisfies the following conditions:

k＝4n+2k′+Δ

k′＝0，1

s＝0，1

n＝0，1，…

j＝0，1，…，v-1

In one possible design, the method further comprises: and sending the port index indication information of the demodulation reference signal to a terminal.

In a ninth aspect, there is provided a communications apparatus comprising at least one processor coupled to a memory, the at least one processor configured to read and execute a program stored in the memory to cause the apparatus to perform:

mapping the sequence of the demodulation reference signal to a time frequency resource of the demodulation reference signal for transmission; the time frequency resources comprise frequency domain resources corresponding to a first port and a second port in a first CDM group, and the frequency domain resources corresponding to the first port and the second port are arranged discontinuously and at equal intervals;

wherein:

In one possible design, the method further comprises: and according to the configuration information table, obtaining a frequency domain OCC, a time domain OCC and a cyclic shift factor corresponding to the demodulation reference signal port index, and performing cyclic shift on the obtained frequency domain OCC and the time domain OCC according to the obtained cyclic shift factor.

obtaining a CDM group frequency domain offset, a frequency domain OCC, a time domain OCC and a cyclic shift factor corresponding to a first RE (k, l) according to the configuration information table, wherein a subcarrier index of the first RE (k, l) in the time-frequency resource is k, and a symbol index is l;

The data mapped on the first RE (k, l)

Satisfies the following conditions:

k＝4n+2k′+Δ

k′＝0，1

n＝0，1，…

j＝0，1，…，v-1

or, the data mapped on the first RE (k, l)

Satisfies the following conditions:

k＝4n+2k′+Δ

k′＝0，1

n＝0，1，…

j＝0，1，…，v-1

In a tenth aspect, there is provided a communications apparatus comprising at least one processor coupled to a memory, the at least one processor configured to read and execute a program stored in the memory to cause the apparatus to perform:

receiving a demodulation reference signal sent by sending equipment on a time-frequency resource of the demodulation reference signal, wherein the demodulation reference signal is used for estimating a channel state of a first channel; the time frequency resources comprise frequency domain resources corresponding to a first CDM group, wherein the frequency domain resources corresponding to the first CDM group are not continuous and are arranged at equal intervals; a first PRB in the frequency domain resource corresponding to the first CDM group comprises a first group of subcarriers and a second group of subcarriers; the first group of subcarriers and the second group of subcarriers respectively comprise 2 subcarriers, the first group of subcarriers corresponds to a first group of OCCs, the second group of subcarriers corresponds to a second group of OCCs, and the first group of OCCs is orthogonal to the second group of OCCs;

obtaining a sequence of the demodulation reference signals.

In one possible design, obtaining the sequence of demodulation reference signals includes:

The data mapped on the first RE (k, l)

Satisfies the following conditions:

k＝4n+2k′+Δ

k′＝0，1

t＝mod(n，2)

n＝0，1，…

j＝0，1，…，v-1

In one possible design, the method further comprises: receiving indication information of the demodulation reference signal port index in the first CDM group sent by the sending device.

In an eleventh aspect, there is provided a communications apparatus comprising at least one processor coupled to a memory, the at least one processor configured to read and execute a program stored in the memory to cause the apparatus to perform:

receiving a demodulation reference signal sent by sending equipment on a time-frequency resource of the demodulation reference signal, wherein the demodulation reference signal is used for estimating a channel state of a first channel; the time frequency resources comprise frequency domain resources corresponding to a first CDM group, wherein the frequency domain resources corresponding to the first CDM group are not continuous and are arranged at equal intervals; the time domain resources corresponding to the first CDM group comprise a first group of symbols and a second group of symbols, the first group of symbols corresponds to a first group of OCCs, the second group of symbols corresponds to a second group of OCCs, and the first group of OCCs is orthogonal to the second group of OCCs;

obtaining a sequence of the demodulation reference signals.

The data mapped on the first RE (k, l)

Satisfies the following conditions:

k＝4n+2k′+Δ

k′＝0，1

s＝0，1

n＝0，1，…

j＝0，1，…，v-1

The data mapped on the first RE (k, l)

Satisfies the following conditions:

k＝4n+2k′+Δ

k′＝0，1

s＝0，1

n＝0，1，…

j＝0，1，…，v-1

In one possible design, the method further comprises: and receiving port index indication information of the demodulation reference signal sent by the sending equipment.

In a twelfth aspect, there is provided a communication apparatus comprising at least one processor coupled to a memory, the at least one processor configured to read and execute a program stored in the memory to cause the apparatus to perform:

Receiving a demodulation reference signal sent by sending equipment on a time-frequency resource of the demodulation reference signal, wherein the demodulation reference signal is used for estimating a channel state of a first channel;

obtaining a sequence of the demodulation reference signals;

wherein:

The data mapped on the first RE (k, l)

Satisfies the following conditions:

k＝4n+2k′+Δ

k′＝0，1

n＝0，1，…

j＝0，1，…，v-1

Or, the data mapped on the first RE (k, l)

Satisfies the following conditions:

k＝4n+2k′+Δ

k′＝0，1

n＝0，1，…

j＝0，1，…，v-1

is an index of a starting symbol of the demodulation reference signal, l' is a symbol offset of the demodulation reference signal, v is a number of transmission layers, phi is a cyclic shift factor, and M is a positive integer equal to or greater than 1.

In a thirteenth aspect, there is provided a chip, coupled to a memory, for reading and executing program instructions stored in the memory to implement the method of any of the first to sixth aspects.

In a fourteenth aspect, there is provided a computer readable storage medium having stored thereon computer instructions which, when run on a computer, cause the computer to perform the method of any of the first to sixth aspects described above.

A fifteenth aspect provides a computer program product which, when invoked by a computer, causes the computer to perform the method of any one of the first to sixth aspects described above.

Drawings

Fig. 1 is a schematic diagram of a network architecture according to an embodiment of the present application;

fig. 2 is a schematic diagram of a DMRS pilot pattern in an embodiment of the present application;

fig. 3 is a flowchart of a demodulation reference signal transmission method implemented on a sending device side according to an embodiment of the present application;

fig. 4 is a schematic diagram of a corresponding relationship between DMRS time-frequency resources and subcarrier groups and OCC groups in the embodiment of the present application;

fig. 5 is a schematic diagram of DMRS time-frequency resources and OCCs corresponding to ports in CDM group 0 in this embodiment of the application;

fig. 6 is a flowchart of a demodulation reference signal transmission method implemented at a receiving device according to an embodiment of the present application;

fig. 7 is a flowchart of a demodulation reference signal transmission method implemented on a sending device side according to an embodiment of the present application;

fig. 8 is a schematic diagram illustrating a correspondence relationship between DMRS time-frequency resources and symbol groups and OCC groups in an embodiment of the present application;

fig. 9 is a schematic diagram of DMRS time-frequency resources and OCCs corresponding to ports in CDM group 0 in this embodiment of the application;

Fig. 10 is a flowchart of a demodulation reference signal transmission method implemented on a receiving device side according to an embodiment of the present application;

fig. 11 is a flowchart of a demodulation reference signal transmission method implemented on a sending device side according to an embodiment of the present application;

fig. 12 is a schematic diagram of an OCC code used when a DMRS is mapped to an RE in an embodiment of the present application;

fig. 13 is a flowchart of a demodulation reference signal transmission method implemented at a receiving device according to an embodiment of the present application;

fig. 14 is a schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 15 is a schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 16 is a schematic structural diagram of a communication device according to an embodiment of the present application;

fig. 17 is a schematic structural diagram of a communication device according to another embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the embodiments of the present application will be described in further detail with reference to the accompanying drawings.

Hereinafter, some terms in the embodiments of the present application are explained to facilitate understanding by those skilled in the art.

1) Terminal equipment, including devices that provide voice and/or data connectivity to a user, may include, for example, handheld devices with wireless connection capability or processing devices connected to wireless modems. The terminal device may communicate with a core network via a Radio Access Network (RAN), exchanging voice and/or data with the RAN. The terminal device may include a User Equipment (UE), a wireless terminal device, a mobile terminal device, a subscriber unit (subscriber unit), a subscriber station (subscriber station), a mobile station (mobile), a remote station (remote station), an Access Point (AP), a remote terminal device (remote terminal), an access terminal device (access terminal), a user terminal device (user terminal), a user agent (user agent), a user equipment (user device), or the like. For example, mobile phones (or so-called "cellular" phones), computers with mobile terminal equipment, portable, pocket, hand-held, computer-included or vehicle-mounted mobile devices, smart wearable devices, and the like may be included. For example, Personal Communication Service (PCS) phones, cordless phones, Session Initiation Protocol (SIP) phones, Wireless Local Loop (WLL) stations, Personal Digital Assistants (PDAs), and the like. Also included are constrained devices, such as devices that consume less power, or devices that have limited storage capabilities, or devices that have limited computing capabilities, etc. Examples of information sensing devices include bar codes, Radio Frequency Identification (RFID), sensors, Global Positioning Systems (GPS), laser scanners, and the like.

By way of example and not limitation, in the embodiments of the present application, the terminal device may also be a wearable device. Wearable equipment can also be called wearable intelligent equipment, is the general term of applying wearable technique to carry out intelligent design, develop the equipment that can dress to daily wearing, like glasses, gloves, wrist-watch, dress and shoes etc.. A wearable device is a portable device that is worn directly on the body or integrated into the clothing or accessories of the user. The wearable device is not only a hardware device, but also realizes powerful functions through software support, data interaction and cloud interaction. The generalized wearable smart device includes full functionality, large size, and can implement full or partial functionality without relying on a smart phone, such as: smart watches or smart glasses and the like, and only focus on a certain type of application functions, and need to be used in cooperation with other devices such as smart phones, such as various smart bracelets, smart helmets, smart jewelry and the like for monitoring physical signs.

2) Network devices, including, for example, Access Network (AN) devices, such as base stations (e.g., access points), may refer to devices in AN access network that communicate with wireless terminal devices over one or more cells over AN air interface. The network device may be configured to interconvert received air frames and Internet Protocol (IP) packets as a router between the terminal device and the rest of the access network, which may include an IP network. The network device may also coordinate attribute management for the air interface. For example, the network device may include an evolved Node B (NodeB or eNB or e-NodeB) in a Long Term Evolution (LTE) system or an evolved LTE system (LTE-Advanced, LTE-a), or may also include a next generation Node B (gNB) in a fifth generation mobile communication technology (5G) New Radio (NR) system, or may also include a Centralized Unit (CU) and a Distributed Unit (DU) in a cloud access network (cloud ran) system, which is not limited in the embodiments of the present application.

3) The terms "system" and "network" in the embodiments of the present application may be used interchangeably. The "plurality" means two or more, and in view of this, the "plurality" may also be understood as "at least two" in the embodiments of the present application. "at least one" is to be understood as meaning one or more, for example one, two or more. For example, including at least one means including one, two, or more, and does not limit which ones are included, for example, including at least one of A, B and C, then including may be A, B, C, A and B, A and C, B and C, or a and B and C. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" generally indicates that the preceding and following related objects are in an "or" relationship, unless otherwise specified.

Unless stated to the contrary, the embodiments of the present application refer to the ordinal numbers "first", "second", etc., for distinguishing between a plurality of objects, and do not limit the sequence, timing, priority, or importance of the plurality of objects.

The embodiments of the present application can be applied to various communication systems, for example, to an LTE system, an LTE-a system, an NR system, or a new communication system appearing in future communication development. As long as an entity in the communication system transmits demodulation reference signals by using different orthogonal mask groups on time-frequency resources corresponding to the same CDM group, so as to achieve the purpose of increasing the number of orthogonal demodulation reference signal ports supported by the system, the communication method provided by the embodiment of the present application may be used.

Referring to fig. 1, a communication system to which the embodiments of the present application are applicable is shown. In the communication system shown in fig. 1, the

network device

101 and 4 terminal devices (102a to 102d) are included, the network device 101 may transmit downlink data and DMRS to the terminal devices (102a to 102d), any one of the terminal devices (102a to 102d) may perform downlink channel estimation according to the received DMRS and transmit DMRS and uplink data to the network device 101, and the network device performs uplink channel estimation according to the received DMRS.

The network device 101 is configured to receive an uplink signal from the terminal devices (102a to 102d) or transmit a downlink signal to the terminal devices. The network device 101 may be a network device of LTE and/or NR, and specifically may be a base station (NodeB), an evolved node b (eNodeB), a base station in a 5G NR mobile communication system (gNB), a base station in a future mobile communication system or an access node in a Wi-Fi system, and the like.

The terminal devices (102 a-102 d) are entities for receiving or transmitting signals at the user side, and are used for sending uplink signals to the network device or receiving downlink signals from the network device. The terminal devices (102 a-102 d) mainly comprise a mobile phone, a vehicle, a tablet personal computer, an intelligent sound box, a train detector, a gas station sensor and the like, and mainly have the functions of collecting data (part of the terminal devices), receiving control information and downlink data of the network device, sending electromagnetic waves and transmitting uplink data to the network device.

Fig. 1 is merely an example, and does not limit the type of communication system and the number, types, and the like of devices included in the communication system. The network architecture and the service scenario described in the embodiment of the present application are for illustrating the technical solution of the embodiment of the present application, and do not form a limitation on the technical solution provided in the embodiment of the present application, and it can be known by a person skilled in the art that the technical solution provided in the embodiment of the present application is also applicable to similar technical problems along with the evolution of the network architecture and the appearance of a new service scenario.

Based on the communication system shown in fig. 1, taking an NR system as an example, in the current NR protocol, the DFT-S-OFDM waveform can support 8 orthogonal DMRS ports at maximum, that is, can support 8-layer multi-user orthogonal pairing, and the CP-OFDM waveform can support 12 orthogonal DMRS ports at maximum, that is, can support 12-layer multi-user orthogonal pairing. For a CP-OFDM waveform, a system supports two DMRS configuration types, namely, a Type 1DMRS (also referred to as a first configuration Type in the following embodiments) and a Type 2DMRS (also referred to as a second configuration Type in the following embodiments), wherein the Type 1DMRS supports 8-port DMRS orthogonality, and the frequency domain density is higher than that of the Type 2 DMRS.

Each cell independently configures a set of DMRS generation parameters for the terminal. The DMRSs can be classified into Front-loaded DMRSs and Additional DMRSs according to time-domain positions of the DMRSs. The Front-loaded DMRS is placed in the first several symbols within one slot, and a maximum of two symbols may be configured. In the frequency domain, different DMRS ports are divided into different Code Division Multiplexing (CDM) groups. In addition, in the DMRS port in the same CDM group, orthogonal spreading codes (OCCs) are used to perform time-frequency domain spreading, and orthogonality on different ports can be ensured, so that accuracy of channel estimation can be improved. The different CDM groups are orthogonal in the frequency domain, i.e., occupy different subcarriers.

Where two sequences or vectors are orthogonal, it means that the inner product of the two sequences or vectors is equal to 0.

Fig. 2 exemplarily shows time-frequency resource locations (i.e., DMRS pilot patterns) of a DMRS employing a first configuration Type (Type 1DMRS), wherein Resource Elements (REs) shown by different padding patterns belong to different CDM groups. p0, p1, …, p7 denote DMRS port indices.

As shown in fig. 2, for Type 1DMRS, when 1 symbol is configured for DMRS transmission, cyclic shift of a sequence or frequency domain OCC is used in a frequency domain to ensure that sequences on 2 DMRS ports in the same CDM group are orthogonal; when the configuration uses 2 symbols for DMRS transmission, within the same CDM group, the sequences on the 4 DMRS ports within the CDM group are guaranteed to be orthogonal by frequency domain cyclic shift or by frequency domain OCC (code length 2) and time domain OCC (code length 2).

As can be seen from fig. 2, the Type 1DMRS includes two CDM groups, and can support only a maximum of 8 orthogonal DMRS ports. If the number of network paired layers exceeds 8 (for example, reaches 16), orthogonality of DMRS ports cannot be guaranteed, which results in degradation of channel estimation performance, impact on demodulation performance of PUSCH, and is not favorable for improvement of uplink capacity. Similarly, downlink DMRS transmission also has the above-mentioned problem.

Based on the above existing problems, embodiments of the present invention provide a signal transmission method and apparatus, so as to increase the number of orthogonal demodulation reference signal ports that can be supported by a system without additionally increasing the overhead of demodulation reference signals. The method and the device are based on the same inventive concept, and because the principles of solving the problems of the method and the device are similar, the implementation of the device and the method can be mutually referred, and repeated parts are not repeated.

The embodiment of the application is suitable for transmission of the downlink demodulation reference signal and is also suitable for transmission of the uplink demodulation reference signal.

Fig. 3 is a flowchart of a signal transmission method implemented at a sending device side according to an embodiment of the present application. The method can be applied to the network architecture shown in fig. 1, and can also be applied to other network architectures, which are not limited in the present application. When the method is applied to the network architecture shown in fig. 1, for downlink demodulation reference signal transmission, the transmitting device involved in the method may be the network device 101 in fig. 1, and the receiving device involved in the method may be the terminal devices (102a to 102d) in fig. 1; for uplink demodulation reference signal transmission, the transmitting device involved in the method may be the terminal devices (102a to 102d) in fig. 1, and the receiving device involved in the method may be the network device 101 in fig. 1.

Referring to fig. 3, the method may include the following process flow:

s301: the transmitting device generates a sequence of demodulation reference signals.

The demodulation reference signal is used for estimating a channel state of the first channel. The demodulation reference signal is used to estimate a channel state of the first channel, and may be understood as the demodulation reference signal of the first channel. For downlink demodulation reference signal transmission, the first channel is used for carrying uplink data; for uplink demodulation reference signal transmission, the first channel is used for carrying downlink data.

Specifically, the demodulation reference signal may be a DMRS for downlink transmission and used for performing channel estimation on a PUSCH, and the demodulation reference signal may also be a DMRS for uplink transmission and used for performing channel estimation on a PDSCH.

More specifically, the DMRS may be a DMRS based on a CP-OFDM waveform, the DMRS configuration Type is a first configuration Type (Type 1 DMRS), and a time domain position of the DMRS is a first symbol or two symbols (i.e., Front-loaded DMRS) within one slot.

Taking DMRS based on CP-OFDM waveform as an example, DMRS sequences may be generated based on gold sequences. Specifically, the DMRS sequence may be generated using the following formula:

Wherein, r (n) is a DMRS sequence, c (i) is a binary sequence, and is a pseudo-random sequence, and initialization is required when generating. The generation formula of the pseudo-random sequence is as follows:

wherein N is_C＝1600，x₁(n) can be initialized to x₁(0)＝1，x₁(n)＝0，n＝1，2，...，30，x₂(n) satisfies

Initializing seed c corresponding to DMRS sequence of PUSCH_initIs defined as:

wherein, l is an OFDM symbol index,

is the number of time slots within one frame,

is the number of symbols in a time slot, n_SCIDE {0, 1} is a DMRS sequence initialization parameter,

is a mask.

The values depend on different higher layer parameter configurations.

S302: and the sending equipment maps the sequence of the demodulation reference signal to the time-frequency resource of the demodulation reference signal for sending.

The time frequency resources to which the sequences of the demodulation reference signals are mapped may include time frequency resources corresponding to the first CDM group. Frequency domain resources in the frequency domain resources corresponding to the first CDM group are not continuous and are arranged at equal intervals, and a first PRB in the frequency domain resources corresponding to the first CDM group comprises a first group of subcarriers and a second group of subcarriers; the first PRB may be any one PRB in the frequency domain resources corresponding to the first CDM group.

The time frequency resources to which the sequences of the demodulation reference signals are mapped may further include time frequency resources corresponding to the second CDM group. Frequency domain resources in the frequency domain resources corresponding to the second CDM group are not continuous and are arranged at equal intervals, and a first PRB in the frequency domain resources corresponding to the second CDM group comprises a first group of subcarriers and a second group of subcarriers; the first PRB may be any one PRB in the frequency domain resource corresponding to the second CDM group.

The first set of subcarriers corresponds to a first set of OCCs, the second set of subcarriers corresponds to a second set of OCCs, and the first set of OCCs is orthogonal to the second set of OCCs.

The first group of subcarriers and the second group of subcarriers respectively comprise 2 subcarriers. Accordingly, the frequency domain resources in the frequency domain resources corresponding to the first CDM group and the second CDM group are arranged discontinuously and at equal intervals, which can be understood as: the subcarriers in the frequency domain resources corresponding to the first CDM group and the second CDM group are distributed at intervals, and the interval distance is one subcarrier.

In some embodiments, the first PRB in the frequency domain resource corresponding to the first CDM group and/or the second CDM group further includes a third group of subcarriers, where the third group of subcarriers includes 2 subcarriers, and the third group of subcarriers corresponds to the first group of OCCs.

Taking the example that one PRB in the frequency domain resource corresponding to one CDM group includes three groups of subcarriers (a first group of subcarriers, a second group of subcarriers, and a third group of subcarriers), in some examples, the first group of subcarriers of the first CDM group in the PRB includes the first subcarrier and the third subcarrier in the PRB, the second group of subcarriers of the first CDM group in the PRB includes the fifth subcarrier and the seventh subcarrier in the PRB, and the third group of subcarriers of the first CDM group in the PRB includes the ninth subcarrier and the eleventh subcarrier in the PRB; the first group of subcarriers of the second CDM group in the PRB comprises a second subcarrier and a fourth subcarrier in the PRB, the second group of subcarriers of the second CDM group in the PRB comprises a sixth subcarrier and an eighth subcarrier in the PRB, and the third group of subcarriers of the second CDM group in the PRB comprises a tenth subcarrier and a twelfth subcarrier in the PRB. The first subcarrier to the twelfth subcarrier in the PRB may be arranged in an order of increasing subcarrier index or frequency, or may be arranged in an order of decreasing subcarrier index or frequency.

Of course, the above is only one example, in another example, the first group of subcarriers of the first CDM group in the PRB includes the second subcarrier and the fourth subcarrier in the PRB, the second group of subcarriers of the first CDM group in the PRB includes the sixth subcarrier and the eighth subcarrier in the PRB, and the third group of subcarriers of the first CDM group in the PRB includes the tenth subcarrier and the twelfth subcarrier in the PRB; the first group of subcarriers of the second CDM group in the PRB comprises a first subcarrier and a third subcarrier in the PRB, the second group of subcarriers of the second CDM group in the PRB comprises a fifth subcarrier and a seventh subcarrier in the PRB, and the third group of subcarriers of the second CDM group in the PRB comprises a ninth subcarrier and an eleventh subcarrier in the PRB.

In some embodiments of the present application, a maximum number of demodulation reference signal ports included in the first CDM group is at least 4N, where N is a number of symbols occupied by the demodulation reference signal. For example, if the demodulation reference signal is transmitted using one symbol, a maximum of 4 demodulation reference signal ports may be included in each CDM group, so that two CDM groups can support a maximum of 8 demodulation reference signal ports; if the demodulation reference signal is transmitted using two symbols, a maximum of 8 demodulation reference signal ports may be included in each CDM group, so that a maximum of 16 demodulation reference signal ports may be supported by two CDM groups.

According to the above embodiment, taking DMRS with the configuration Type being the first configuration Type (Type 1DMRS) as an example, and the time-domain position of the DMRS is the first one or two symbols (i.e., Front-loaded DMRS) in one slot, in some embodiments of the present application, the time-frequency resource position of the DMRS may be as shown in fig. 4.

As shown in fig. 4, when 1 symbol is configured for DMRS transmission, a frequency domain OCC is used in a frequency domain to ensure that sequences on 4 DMRS ports in the same CDM group are orthogonal; when 2 symbols are configured for DMRS transmission, a frequency domain OCC is used in a frequency domain and a time domain OCC is used in a time domain to ensure that sequences on 8 DMRS ports in the same CDM group are orthogonal.

In fig. 4, when 2 symbols are allocated, the subcarriers corresponding to CDM group 0 include subcarriers {0,2,4,6,8,10}, where subcarriers {0,2} constitute a first group of subcarriers, subcarriers {4,6} constitute a second group of subcarriers, and subcarriers {8,10} constitute a third group of subcarriers. The first group of subcarriers corresponds to a first group of OCCs, the second group of subcarriers corresponds to a second group of OCCs, the third group of subcarriers corresponds to a first group of OCCs, and the first group of OCCs is orthogonal to the second group of OCCs.

The subcarriers corresponding to CDM group 1 include subcarriers {1,3,5,7,9,11}, where subcarriers {1,3} form a first set of subcarriers, subcarriers {5,7} form a second set of subcarriers, and subcarriers {9,11} form a third set of subcarriers. The first and third groups of subcarriers correspond to the same set of OCCs and are orthogonal to the set of OCCs corresponding to the second group of subcarriers.

In fig. 4, when 1 symbol is allocated, the subcarriers corresponding to CDM group 0 include subcarriers {0,2,4,6,8,10}, where subcarriers {0,2} constitute a first group of subcarriers, subcarriers {4,6} constitute a second group of subcarriers, and subcarriers {8,10} constitute a third group of subcarriers. The subcarriers corresponding to CDM group 1 include subcarriers {1,3,5,7,9,11}, where subcarriers {1,3} form a first set of subcarriers, subcarriers {5,7} form a second set of subcarriers, and subcarriers {9,11} form a third set of subcarriers. The first and third groups of subcarriers correspond to the same set of OCCs and are orthogonal to the set of OCCs corresponding to the second group of subcarriers.

It should be noted that, in fig. 4, when 1 symbol is configured for DMRS transmission, only CDM group 0 includes DMRS ports { p0, p1, p4, p5}, CDM group 1 includes DMRS ports { p2, p3, p6, p7}, and in some other embodiments, the port combinations included in CDM group 0 and CDM group 1 may also be other cases, for example, CDM group 0 includes DMRS ports { p0, p1, p6, p7}, CDM group 1 includes DMRS ports { p2, p3, p4, p5}, which is not listed here. When 2 symbols are configured for DMRS transmission, CDM group 0 includes DMRS ports { p0, p1, p4, p5, p8, p9, p12, p13}, CDM group 1 includes DMRS ports { p2, p3, p6, p7, p10, p11, p14, p15}, and in some other embodiments, the port combinations included in CDM group 0 and CDM group 1 may be other cases, for example, CDM group 0 includes DMRS ports { p0, p1, p4, p5, p10, p11, p14, p15}, and CDM group 1 includes DMRS ports { p2, p3, p6, p7, p8, p9, p12, p13}, which are not listed one by one after another.

It is also noted that the symbol positions used for transmitting DMRS are configurable. Fig. 4 only uses the symbol with the configuration index of 2 to transmit the DMRS, or uses the symbols with the configuration indexes of 2 and 3 to transmit the DMRS, in some other embodiments, other symbols may be configured to transmit the DMRS.

It can be seen from the above embodiments that, in the embodiments of the present application, time-frequency resource overhead of the demodulation reference signal is not additionally increased, but subcarriers on one PRB in a frequency domain resource corresponding to one CDM group are divided into a first group of subcarriers and a second group of subcarriers, so that the first group of subcarriers corresponds to the first group of OCCs, the second group of subcarriers corresponds to the second group of OCCs, and the first group of OCCs and the second group of OCCs are orthogonal to each other, thereby increasing the number of mutually orthogonal demodulation reference signal ports in one CDM group, and further increasing the number of orthogonal demodulation reference signal ports that can be supported by the system.

When the embodiment of the application is applied to the DMRS with the configuration Type of Type 1DMRS, the orthogonality of 16 DMRS ports can be supported under the condition of not increasing the DMRS overhead, the multi-user pairing of 16 layers of orthogonality is realized, the reduction of interlayer interference among the DMRS is facilitated, and a more accurate channel estimation result is obtained.

In the embodiment of the present application, after the sending device generates the demodulation reference signal sequence, the OCC may be obtained by querying the configuration information table of the demodulation reference signal, and the mapping of the demodulation reference signal sequence to the time-frequency resource is performed according to the OCC, that is, the sequence of the demodulation reference signal is mapped to the time-frequency resource of the demodulation reference signal.

In some embodiments, the configuration information table of the demodulation reference signal includes a correspondence relationship between a demodulation reference signal port index, a CDM group frequency domain offset, and an OCC, where the OCC includes a frequency domain OCC and a time domain OCC, and the frequency domain OCC includes a first group OCC and a second group OCC. The sending device may obtain, according to the configuration information table, a first group of OCCs corresponding to the first group of subcarriers and a second group of OCCs corresponding to the second group of subcarriers, so as to map the sequence of the demodulation reference signal to the time-frequency resource of the demodulation reference signal according to the obtained OCCs.

In some embodiments, the configuration information table of the srs includes a first configuration information table and a second configuration information table, and the port indexes of the srs included in the first configuration information table and the port indexes of the srs included in the second configuration information table are different. The first configuration information table comprises a corresponding relation among a demodulation reference signal port index, a CDM group frequency domain offset and an OCC, and the OCC comprises a frequency domain OCC and a time domain OCC. The second information configuration table includes a corresponding relationship of demodulation reference signal port index, CDM group frequency domain offset, and OCC, the OCC includes a frequency domain OCC and a time domain OCC, and the frequency domain OCC includes a first group of OCCs and a second group of OCCs. The sending device may obtain, according to the configuration information table, a first group of OCCs corresponding to the first group of subcarriers and a second group of OCCs corresponding to the second group of subcarriers, so as to map the sequence of the demodulation reference signal to the time-frequency resource of the demodulation reference signal according to the obtained OCCs.

In some embodiments of the present application, the sending device may map the demodulation reference signal sequence to the time-frequency resource of the demodulation reference signal according to the following formula:

k＝4n+2k′+Δ

k′＝0，1

t＝mod(n，2)

n＝0，1，…

j＝0，1，…，v-1

wherein,

data in which a sequence representing a demodulation reference signal is mapped on RE (k, l), where k is a subcarrier index and l is a symbol index; w_f(k' +2t) is the frequency domain OCC, W_t(l ') is a time domain OCC, and r (2n + k') is an initial sequence of the demodulation reference signal; Δ is the CDM group frequency domain offset;

is an index of a starting symbol of the demodulation reference signal, l' is a symbol offset of the demodulation reference signal, and v is a number of transmission layers. When t is 0, the frequency domain OCC is the first group OCC; t is 1, and the frequency domain OCC is the second group OCC. The first group of OCCs corresponds to a first group of subcarriers and the second group of OCCs corresponds to a second group of subcarriers.

In the above formula (4), the expression W of the frequency domain OCC_f(k' +2t), the following expression may also be substituted: w_f(k', t), the mapping is the same as described above.

In some embodiments, based on the above equation (4), the process of the transmitting device mapping the sequence of the demodulation reference signals onto the time-frequency resources of the demodulation reference signals may include the following steps:

step 1: the sending equipment acquires the CDM group frequency domain offset, the frequency domain OCC and the time domain OCC corresponding to RE (k, l) according to the configuration information table of the demodulation reference signal;

Step 2: the transmitting device obtains data of the sequence mapping of the demodulation reference signal on RE (k, l) according to the obtained CDM group frequency domain offset, frequency domain OCC and time domain OCC

Wherein the data mapped on RE (k, l)

Equation (4) above is satisfied, that is, the transmitting device may perform processing using equation (4) based on the obtained CDM frequency domain offset, frequency domain OCC, and time domain OCC, thereby obtaining data on which the sequence of the demodulation reference signal is mapped on RE (k, l)

The implementation process of the embodiment of the present application is described below with reference to formula (4) that needs to be satisfied by the mapping process and with reference to the two different setting manners of the demodulation reference signal configuration information table, taking the DMRS with the configuration Type being the first configuration Type (Type 1 DMRS) as an example.

In some embodiments of the present application, one configuration information table may be set for DMRS, which includes 16 DMRS port indexes, and CDM group frequency domain offset and OCC corresponding to each DMRS port index. The frequency domain OCC includes a first group of OCCs corresponding to the first group of subcarriers and a second group of OCCs corresponding to the second group of subcarriers. Specific examples are shown in Table 1.

Table 1 exemplarily shows a configuration information table of a DMRS provided in an embodiment of the present application.

Table 1: DMRS configuration information of Type 1 DMRS (Parameters for PUSCH DM-RS configuration Type 1)

In Table 1，

Denotes a DMRS port index, λ denotes a CDM group index, Δ denotes a CDM group frequency domain offset (the CDM group frequency domain offset values are 0 and 1), W denotes_f(k' +2t) is the frequency domain OCC, W_t(l') is the time domain OCC. The frequency domain OCC includes two sets, where a set of OCCs corresponding to t ═ 0 is a first set of OCCs, and a set of OCCs corresponding to t ═ 1 is a second set of OCCs.

In table 1, DMRS ports with port indexes of 8-15 are newly added ports based on existing ports in the embodiment of the present application. Although the OCCs corresponding to the DMRS ports having port indexes of 0 to 7 are also extended, the extended frequency domains OCC (2 columns of frequency domains OCC corresponding to t ═ 1) are all the same as the original frequency domains OCC (2 columns of frequency domains OCC corresponding to t ═ 0), so that the OCCs corresponding to the DMRS ports having port indexes of 0 to 7 in table 1 are the same as the OCCs corresponding to the DMRS ports in the original DMRS configuration information table. This means that the newly added DMRS port does not affect the use of the original DMRS port, and may be compatible with the receiving device of the original standard.

Taking the example of configuring 2 symbols, if a transmitting device configures DMRS ports { p0, p1, p4, p5, p8, p9, p12, p13} in CDM group 0 for a receiving device, after generating a DMRS sequence, the transmitting device may query table 1 according to DMRS port indexes to obtain a corresponding OCC, and map the DMRS sequence to a corresponding time-frequency resource according to the queried OCC by using the formula (4).

Taking the time-frequency resource shown in fig. 4 as an example, the sequence of each DMRS port in CDM group 0 may be mapped to the diagonally filled REs in fig. 4.

Take the sequence mapping the DMRS port p8 as an example, and the DMRS initial symbol index

Is 2, l ═ 0, 1 (i.e., DMRS is transmitted on symbols with indices equal to 2 and 3):

when n is 0, then:

t＝mod(n，2)＝0；

when k ' is 0, l ' is 0, k is 4n +2k ' + Δ is 0,

w is obtained by looking up Table 1_f(k′+2t)＝1，W_t(l') is 1, that is, the frequency domain OCC and the time domain OCC of the sequence of the DMRS port p8 on RE (0, 2) are (1, 1), respectively;

when k ' is 0, l ' is 1, k is 4n +2k ' + Δ is 0,

w is obtained by looking up Table 1_f(k′+2t)＝1，W_t(l') is 1, that is, the frequency domain OCC and the time domain OCC of the sequence of the DMRS port p8 on RE (0, 3) are (1, 1), respectively;

when k ' is 1, l ' is 0, k is 4n +2k ' + Δ is 2,

w is obtained by looking up Table 1_f(k′+2t)＝1，W_t(l') is 1, that is, the frequency domain OCC and the time domain OCC of the sequence of the DMRS port p8 on RE (2, 2) are (1, 1), respectively;

when k ' is 1, l ' is 1, k is 4n +2k ' + Δ is 2,

w is obtained by looking up Table 1_f(k′+2t)＝1，W_t(l') is 1, that is, the frequency domain OCC and the time domain OCC of the sequence of the DMRS port p8 on RE (2, 3) are (1, 1), respectively;

from the OCC used by the above DMRS port p8 on the first set of subcarriers (subcarrier indices 0 and 2) of

CDM group

0 and 4 REs corresponding to symbol 2 and symbol 3, a set of frequency domain OCCs {1, 1, 1, 1} may be obtained.

When n is 1, then:

t＝mod(n，2)＝1；

when k ' is 0, l ' is 0, k is 4n +2k ' + Δ is 4,

w is obtained by looking up Table 1_f(k′+2t)＝-1，W_t(l') is 1, that is, the frequency domain OCC and the time domain OCC of the sequence of the DMRS port p0 on RE (4, 2) are (-1, 1), respectively;

when k ' is 0, l ' is 1, k is 4n +2k ' + Δ is 4,

w is obtained by looking up Table 1_f(k′+2t)＝-1，W_t(l') is 1, that is, the frequency domain OCC and the time domain OCC of the sequence of the DMRS port p0 on RE (4, 3) are (-1, 1), respectively;

when k ' is 1, l ' is 0, k is 4n +2k ' + Δ is 6,

w is obtained by looking up Table 1_f(k′+2t)＝-1，W_t(l') is 1, i.e. the frequency domain OCC and the time domain OCC of the sequence of DMRS port p0 on RE (6, 2) are (-1, 1), respectively;

when k ' is 1, l ' is 1, k is 4n +2k ' + Δ is 6,

w is obtained by looking up Table 1_f(k′+2t)＝-1，W_t(l') is 1, i.e. the frequency domain OCC and the time domain OCC of the sequence of DMRS port p0 on RE (6, 3) are (-1, 1), respectively;

from the OCC used by the above DMRS port p8 on the second set of subcarriers (subcarrier indices 4 and 6) of

CDM group

0 and 4 REs corresponding to symbol 2 and symbol 3, a set of frequency domain OCCs { -1, -1, -1, -1} may be obtained.

In the same way, a first group of OCCs used by the sequences of other DMRS ports in CDM group 0 on the first group of subcarriers (subcarrier indices 0 and 2) and 4 REs corresponding to symbol 2 and symbol 3, and a second group of OCCs used on the second group of subcarriers (subcarrier indices 4 and 6) and 4 REs corresponding to symbol 2 and symbol 3 can be obtained. Only the first group of OCCs used on the above 8 REs by the DMRS port p8, DMRS port p9, DMRS port p12, and DMRS port p13 in CDM group 0, and the second group of OCCs used on the second group of subcarriers and 4 REs corresponding to symbol 2 and symbol 3 are listed here, see fig. 5 in detail.

As shown in fig. 5, on the first set of subcarriers (subcarrier index is 0,2) corresponding to CDM group 0, the frequency domain OCC of the first set of REs (frequency domain 2 REs, time domain 2 symbols) corresponding to port p8 is {1,1,1,1}, and on the second set of subcarriers (subcarrier index is 4,6) corresponding to CDM group 0, the frequency domain OCC of the second set of REs corresponding to port p8 is { -1, -1, -1, -1}, and the two sets of OCCs are orthogonal.

On the first set of subcarriers (subcarrier index is 0,2) corresponding to CDM group 0, the frequency domain OCC of the first set of REs corresponding to port p9 is {1, -1,1, -1}, and on the second set of subcarriers (subcarrier index is 4,6) corresponding to CDM group 0, the frequency domain OCC of the second set of REs corresponding to port p9 is { -1,1, -1,1}, which are orthogonal.

On the first set of subcarriers (subcarrier index is 0,2) corresponding to CDM group 0, the frequency domain OCC of the first set of REs corresponding to port p12 is {1,1, -1, -1}, and on the second set of subcarriers (subcarrier index is 4,6) corresponding to CDM group 0, the frequency domain OCC of the second set of REs corresponding to port p12 is { -1, -1,1,1}, which are orthogonal.

On the first set of subcarriers (subcarrier index is 0,2) corresponding to CDM group 0, the frequency domain OCC of the first set of REs corresponding to port p13 is {1, -1, -1,1}, and on the second set of subcarriers (subcarrier index is 4,6) corresponding to CDM group 0, the frequency domain OCC of the second set of REs corresponding to port p13 is { -1,1,1, -1}, which are orthogonal.

In the embodiment of the present application, the first group of subcarriers, the second group of subcarriers, and the 8 REs corresponding to 2 symbols are combined together for orthogonality, and the frequency domain OCC may be equivalent to an OCC with a length of 8.

The OCC of the sequence of DMRS ports { p0, p1, p4, p5} in CDM group 0 over 8 REs corresponding to the above two groups of subcarriers and 2 symbols is consistent with that defined in the current standard. In this way, if the DMRS ports in CDM group 0 configured by the transmitting device for the receiving device do not include ports { p8, p9, p12, p13}, there is no need to change the current DMRS sequence mapping method; if the sending device configures at least one of ports { p8, p9, p12, p13} in the DMRS ports in CDM group 0 for the receiving device, DMRS mapping is performed according to the above-described method provided in the embodiment of the present application, so as to ensure that the signals of the newly added 4 DMRS ports are orthogonal to the signals of the original 4 DMRS ports.

In other embodiments of the present application, a first configuration information table and a second configuration information table may be set for DMRS, where the first configuration information table includes 8 DMRS port indexes, and a CDM group frequency domain offset and an OCC corresponding to each DMRS port index. The second configuration information table includes another 8 DMRS port indexes, and a CDM group frequency domain offset and an OCC corresponding to each DMRS port index, and in the second configuration information table, the frequency domain OCCs in the OCCs include a first group OCC and a second group OCC. The first configuration information table may be shown in table 2, and the second configuration information table may be shown in table 3.

Table 2 exemplarily shows a first configuration information table of a DMRS provided in an embodiment of the present application.

Table 2: DMRS configuration information table 1 for Type 1 DMRS (Parameters for PUSCH DM-RS configuration Type 1)

The parameter descriptions in table 2 are substantially the same as those in table 1 and will not be repeated here.

Table 3 exemplarily shows a second configuration information table of a DMRS provided in an embodiment of the present application.

Table 3: DMRS configuration information table 2 for Type 1 DMRS (Parameters for PUSCH DM-RS configuration Type 1)

The parameter descriptions in table 3 are substantially the same as those in table 1 and will not be repeated here.

And if the index of the DMRS port configured for the receiving equipment by the sending equipment is less than 8, obtaining the corresponding OCC according to the table 2, and mapping the DMRS sequence to the corresponding time-frequency resource by adopting a traditional DMRS mapping formula according to the obtained OCC by query.

The traditional DMRS mapping formula is as follows:

k＝4n+2k′+Δ

k′＝0，1

n＝0，1，…

j＝0，1，…，v-1

the meaning of the parameters in the above formula is basically the same as the parameters in formula 4, and will not be repeated here.

If the index of the DMRS port configured by the sending equipment for the receiving equipment is greater than or equal to 8, the corresponding OCC is obtained according to the table 3, and the DMRS sequence is mapped to the corresponding time frequency resource by adopting the formula 4 according to the OCC obtained by query. The detailed implementation can refer to the relevant contents of the foregoing embodiments.

In some embodiments of the present application, the transmitting device may further indicate, to the receiving device, a port index of a demodulation reference signal configured for the receiving device. Taking downlink DMRS transmission as an example, specifically, the sending device may send indication information of DMRS port indexes to the terminal device through Downlink Control Information (DCI).

In the embodiment of the present application, the correspondence table between the demodulation reference signal port index indication information and the demodulation reference signal port may be expanded, and the corresponding reference signal port index indication information is set for the demodulation reference signal port newly added in the embodiment of the present application.

Further, in order to save signaling overhead, in the embodiment of the present application, joint coding may be performed on multiple demodulation reference signal port indexes, so that the multiple demodulation reference signal port indexes are indicated by using less bits of indication information.

A table of correspondence between DMRS port index indication information and DMRS port index after the extension of the embodiment of the present application is described below by taking a DMRS as an example and using a first configuration Type (Type 1 DMRS).

Table 4 exemplarily shows a table of correspondence between DMRS port index indication information and DMRS port index when rank is 1 according to an embodiment of the present application. Wherein, rand-1 indicates that the number of transmission layers is 1, and the transmitting device configures 1 DMRS port for the receiving device. maxLength indicates the maximum number of preamble symbols of the DMRS.

Table 4: DMRS port index indication information and DMRS port index correspondence table (Antenna port(s), transform coder is disabled, DMRS-Type 1, maxLength 2, rank 1)

Table 4 shows values (values) of port index indication information corresponding to DMRS port indexes 0 to 15, where 14 to 21 are indication information newly added on the basis of original indication information in the embodiment of the present application, and indicate DMRS port indexes 8 to 15, respectively, and indication information 22 to 31 are reserved. The DMRS port index indication information length may be 5 bits.

The method does not exclude the DMRS port indexes from being indicated in other modes, for example, in some embodiments, the original corresponding relation table of the indication information aiming at the DMRS port indexes 0-7 and the DMRS port indexes can be reserved, and on the basis, a corresponding relation table is newly added and used for giving the corresponding DMRS port index indication information aiming at the DMRS port indexes 8-15. Specific examples are shown in Table 5. maxLength indicates that the maximum preamble number of the DMRS indicates the maximum preamble of the DMRS.

Table 5: DMRS port index indication information and DMRS port index correspondence table (Antenna port(s), transform coder is disabled, DMRS-Type 1, maxLength 2, rank 1)

Table 5 shows values (values) of port index indication information corresponding to DMRS port indexes 8 to 15. The DMRS port index indication information length may be 3 bits. Taking downlink DMRS transmission as an example, when the index of the DMRS port configured for the terminal device by the network device is greater than 8, the corresponding DMRS port index indication information may be obtained according to table 5, and the indication information is carried in the DCI and sent to the terminal device.

Table 6 exemplarily shows a table of correspondence between DMRS port index indication information and DMRS port index when rank is 2 according to an embodiment of the present application. Wherein, rand-2 indicates that the number of transmission layers is 2, and the transmitting device configures 2 DMRS ports for the receiving device. maxLength indicates the maximum number of preamble symbols of the DMRS.

Table 6: DMRS port index indication information and DMRS port index correspondence table (Antenna port(s), transform coder is disabled, DMRS-Type 1, maxLength 2, rank 2)

In table 6, the indication information with a value of 10 to 15 is newly added on the basis of the original indication information in the embodiment of the present application, and is used to indicate the port combination with the port index greater than or equal to 8. The DMRS port index indication information length may be 4 bits.

The DMRS port combinations shown in table 6 are only one example, and do not exclude other possible port combinations, such as

DMRS port index

8 and 13 combinations, DMRS port index 10 and 15 combinations, and so on.

The method does not exclude that other modes are adopted to indicate the DMRS port indexes, for example, in some embodiments, the original corresponding relation table of the DMRS port index indication information aiming at the DMRS port indexes 0-7 and the DMRS port indexes can be reserved, and on the basis, a corresponding relation table is newly added and used for giving corresponding DMRS port index indication information aiming at the DMRS port indexes 8-15. Specific examples are shown in Table 7. maxLength indicates that the maximum preamble number of the DMRS indicates the maximum preamble of the DMRS.

Table 7: DMRS port index indication information and DMRS port index correspondence table (Antenna port(s), transform coder is disabled, DMRS-Type 1, maxLength 2, rank 2)

In table 7, values of corresponding DMRS port index indication information are given for various port combinations of the port indexes 8 to 15. Taking downlink DMRS transmission as an example, the network device may use 3 bits to indicate various combinations of DMRS port indexes 0 to 15 in the DCI, and may also indicate only a part of the DMRS port indexes in the DCI under some circumstances, for example, when the DMRS port indexes configured for the terminal by the current network device are 0 to 3, the DMRS port indexes configured for the terminal device may be indicated by using 2 bits of indication information.

Table 8 exemplarily shows a table of correspondence between DMRS port index indication information and DMRS port index when rank is 3 according to an embodiment of the present application. Wherein, rand-3 indicates that the number of transmission layers is 3, and the transmitting device configures 3 DMRS ports for the receiving device. maxLength indicates the maximum number of preamble symbols of the DMRS.

Table 8: DMRS port index indication information and DMRS port index correspondence table (Antenna port(s), transform coder is disabled, DMRS-Type 1, maxLength 2, rank 3)

In table 8, the indication information with a value of 3 to 4 is the indication information newly added on the basis of the original indication information in the embodiment of the present application, and is used to indicate the port combination with the port index greater than or equal to 8. The DMRS port index indication information length may be 4 bits.

In some other embodiments, when rank is 3, other port combinations may be adopted, such as shown in table 9. maxLength indicates that the maximum preamble number of the DMRS indicates the maximum preamble of the DMRS.

Table 9: DMRS port index indication information and DMRS port index correspondence table (Antenna port(s), transform coder is disabled, DMRS-Type 1, maxLength 2, rank 3)

The method does not exclude that other modes are adopted to indicate the DMRS port indexes, for example, in some embodiments, the original corresponding relation table of the DMRS port index indication information aiming at the DMRS port indexes 0-7 and the DMRS port indexes can be reserved, and on the basis, a corresponding relation table is newly added and used for giving corresponding DMRS port index indication information aiming at the DMRS port indexes 8-15. Specific examples are shown in Table 10. maxLength indicates that the maximum preamble number of the DMRS indicates the maximum preamble of the DMRS.

Table 10: DMRS port index indication information and DMRS port index correspondence table (Antenna port(s), transform coder is disabled, DMRS-Type 1, maxLength 2, rank 3)

Table 11 exemplarily shows a table of correspondence between DMRS port index indication information and DMRS port index when rank is 4 according to an embodiment of the present application. Wherein, rand-4 indicates that the number of transmission layers is 4, and the transmitting device configures 4 DMRS ports for the receiving device. maxLength indicates that the maximum preamble number of the DMRS indicates the maximum preamble of the DMRS.

Table 11: DMRS port index indication information and DMRS port index correspondence table (Antenna port(s), transform coder is disabled, DMRS-Type 1, maxLength 2, rank 4)

The DMRS port index combining manner shown in table 11 is only an example, and in some other embodiments, when rank is 4, other DMRS port index combining manners may also be used.

In some embodiments, the original corresponding relation table of the DMRS port index indication information for DMRS port indexes 0 to 7 and the DMRS port index may be reserved, and on this basis, a new corresponding relation table is added for providing corresponding DMRS port index indication information for DMRS port indexes 8 to 15. Specific examples are shown in Table 12. maxLength indicates that the maximum preamble number of the DMRS indicates the maximum preamble of the DMRS.

Table 12: DMRS port index indication information and DMRS port index correspondence table (Antenna port(s), transform coder is disabled, DMRS-Type 1, maxLength 2, rank 4)

Fig. 6 is a flowchart of a signal transmission method implemented at a receiving device according to an embodiment of the present application. The method can be applied to the network architecture shown in fig. 1, and can also be applied to other network architectures, which are not limited in the present application. When the method is applied to the network architecture shown in fig. 1, for downlink demodulation reference signal transmission, the sending device involved in the method may be the network device 101 in fig. 1, and the terminal device involved in the method may be the terminal devices (102a to 102d) in fig. 1; for uplink demodulation reference signal transmission, the transmitting device involved in the method may be the terminal devices (102a to 102d) in fig. 1, and the receiving device involved in the method may be the network device 101 in fig. 1.

Referring to fig. 6, the method may include the following process flow:

s601: and the receiving equipment receives the demodulation reference signal sent by the sending equipment on the time-frequency resource of the demodulation reference signal.

For the description of the demodulation reference signal and the demodulation reference signal transmitted by the transmitting device, reference may be made to the relevant contents in fig. 3.

S602: the receiving device obtains the sequence of the demodulation reference signals.

In some embodiments, the receiving device is configured with a configuration information table of demodulation reference signals. For the description of the configuration information table, reference may be made to the related description in the flow related to fig. 3. The receiving device may process the received demodulation reference signal according to the configuration information table of the demodulation reference signal to obtain a sequence of the demodulation reference signal, and specifically, the method may include the following steps:

step 1: the receiving equipment obtains a CDM group frequency domain offset, a frequency domain OCC and a time domain OCC corresponding to a first RE (k, l) according to a configuration information table of a demodulation reference signal, wherein a subcarrier index of the first RE (k, l) in the time-frequency resource is k, and a symbol index is l;

step 2: the receiving device obtains data of the demodulation reference signal on the first RE (k, l) according to the CDM group frequency domain offset, the frequency domain OCC and the time domain OCC

The data mapped on the first RE (k, l)

The above formula (4) is satisfied.

In some embodiments, the receiving device receives indication information of a demodulation reference signal port index in a first CDM group sent by the sending device, so as to obtain a demodulation reference signal port index allocated by the sending device according to the indication information of the demodulation reference signal port index, and query the configuration information table of the demodulation reference signal according to the demodulation reference signal port index and the CDM group to which the demodulation reference signal port index belongs, so as to obtain an OCC code, and further calculate a sequence of the demodulation reference signal based on a mapping formula of the demodulation reference signal.

According to the embodiments of the present application, the number of orthogonal DMRS ports can be increased without increasing DMRS overhead, and in addition, the present invention can be compatible with existing receiving equipment, that is, a new receiving equipment provided by the present application and receiving equipment that only supports existing standard capabilities can be paired for multiple users, and the existing receiving equipment does not need to update hardware and software. The capacity expansion of the DMRS orthogonal port can enable multi-user orthogonal pairing of more uplink or downlink layers, and is beneficial to improving the system capacity.

The embodiment of the application also provides a signal transmission method and a signal transmission device, which are used for increasing the number of orthogonal demodulation reference signal ports which can be supported by a system under the condition of not additionally increasing the overhead of demodulation reference signals. The method and the device are based on the same inventive concept, and because the principles of solving the problems of the method and the device are similar, the implementation of the device and the method can be mutually referred, and repeated parts are not repeated.

Fig. 7 is a flowchart of a signal transmission method implemented at a sending device according to an embodiment of the present application. The method can be applied to the network architecture shown in fig. 1, and can also be applied to other network architectures, which are not limited in the present application. When the method is applied to the network architecture shown in fig. 1, for downlink demodulation reference signal transmission, the transmitting device involved in the method may be the network device 101 in fig. 1, and the receiving device involved in the method may be the terminal devices (102a to 102d) in fig. 1; for uplink demodulation reference signal transmission, the transmitting device involved in the method may be the terminal devices (102a to 102d) in fig. 1, and the receiving device involved in the method may be the network device 101 in fig. 1.

Referring to fig. 7, the method may include the following process flow:

s701: the transmitting device generates a sequence of demodulation reference signals.

More specifically, the DMRS may be a DMRS based on a CP-OFDM waveform, the DMRS configuration Type is a first configuration Type (Type 1DMRS), and a time domain position of the DMRS is a first symbol or two symbols (i.e., Front-loaded DMRS) within one slot.

The specific implementation method for the sending device to generate the demodulation reference signal sequence is substantially the same as the related content in S301 in fig. 3, and is not repeated here.

S702: and the sending equipment maps the sequence of the demodulation reference signal to the time-frequency resource of the demodulation reference signal for sending.

The time frequency resources to which the sequences of the demodulation reference signals are mapped include frequency domain resources corresponding to the first CDM group.

The frequency domain resources corresponding to the first CDM group are not sequentially arranged at equal intervals, wherein the arrangement of the frequency domain resources corresponding to one CDM group can be referred to as S302 in fig. 3.

The time domain resource corresponding to the first CDM group includes a first group of symbols corresponding to the first group of OCCs and a second group of symbols corresponding to the second group of OCCs, and the first group of OCCs is orthogonal to the second group of OCCs.

Wherein in some embodiments, the first and second sets of OCCs are time domain OCCs, and in other embodiments, the first and second sets of OCCs are frequency domain OCCs.

The demodulation reference signal type is associated with a time domain in which the demodulation reference signal is located. The demodulation reference signal may include two types according to different time domain positions of the demodulation reference signal: a front-loaded demodulation reference signal and an additional demodulation reference signal. The time domain position of the pre-demodulation reference signal is the first several symbols in a slot, such as the first 2 symbols of the first slot in a subframe; the time domain position of the extra demodulation reference signal is a few symbols after the time domain position of the preamble demodulation reference signal, for example, 2 symbols in the second slot in one subframe. The first set of symbols may include symbols occupied by a preamble demodulation reference signal and the second set of symbols may include symbols occupied by an extra demodulation reference signal. For convenience of description, in the embodiments of the present application, the preamble demodulation reference signal type is referred to as a first demodulation reference signal type, and the extra demodulation reference signal type is referred to as a second demodulation reference signal type, where the first demodulation reference signal type corresponds to a first group of symbols and the second demodulation reference signal type corresponds to a second group of symbols.

In some embodiments, the first and second sets of symbols comprise the same number of symbols, for example, the first and second sets of symbols comprise 2 consecutive symbols respectively.

In some embodiments of the present application, a maximum number of demodulation reference signal ports included in the first CDM group is at least 4N, where N is a number of symbols included in the first group of symbols or the second group of symbols. For example, if 2 preamble symbols are configured for the demodulation reference signal, a maximum of 8 demodulation reference signal ports may be included in each CDM group, so that a maximum of 16 demodulation reference signal ports may be supported by two CDM groups.

According to the above embodiment, taking DMRS with the configuration Type being the first configuration Type (Type 1DMRS) as an example, and the preamble symbol of the DMRS is two symbols in the first slot, and the extra symbol is two symbols in the second slot, in some embodiments of the present application, the time-frequency resource location of the DMRS may be as shown in fig. 7.

As shown in fig. 8, when 2 preamble symbols and 2 extra symbols are configured, the first set of symbols corresponding to CDM group 0 includes symbols {2,3,8,9}, where the symbols {2,3} form the first set of symbols and the symbols {8,9} form the second set of symbols. The first set of symbols corresponds to a first set of OCCs and the second set of symbols corresponds to a second set of OCCs, the first set of OCCs being orthogonal to the second set of OCCs.

The first set of symbols for CDM group 1 includes

symbols

2,3,8,9, where

symbols

2,3 constitute the first set of symbols and

symbols

8,9 constitute the second set of symbols. The first set of symbols corresponds to a first set of OCCs and the second set of symbols corresponds to a second set of OCCs, the first set of OCCs being orthogonal to the second set of OCCs.

It should be noted that, in fig. 8, when 2 preamble symbols and 2 additional symbols are configured for DMRS transmission, only CDM group 0 includes DMRS ports { p0, p1, p4, p5, p8, p9, p12, p13}, CDM group 1 includes DMRS ports { p2, p3, p6, p7, p10, p11, p14, p15}, and in other embodiments, the combination of ports included in CDM group 0 and CDM group 1 may be other cases, for example, CDM group 0 includes DMRS ports { p0, p1, p4, p5, p10, p11, p14, p15}, CDM group 1 includes DMRS ports { p2, p3, p6, p7, p8, p9, p12, p13}, which are not listed here.

It should be further noted that the symbol positions for transmitting the DMRS are configurable and are not limited to the symbol positions shown in fig. 7. For example, the preamble symbol may be configured to 1 st and 2 nd OFDM symbols.

It can be seen from the above embodiments that, in the embodiments of the present application, time-frequency resource overhead of the demodulation reference signal is not additionally increased, but symbols in a time-domain resource corresponding to one CDM group are divided into a first group of symbols and a second group of symbols, so that the first group of symbols corresponds to the first group of OCCs, the second group of symbols corresponds to the second group of OCCs, and the first group of OCCs and the second group of OCCs are orthogonal to each other, thereby increasing the number of mutually orthogonal demodulation reference signal ports in one CDM group, and further increasing the number of orthogonal demodulation reference signal ports that can be supported by the system.

When the embodiment of the application is applied to the DMRS with the configuration Type of Type 1 DMRS, the orthogonality of 16 DMRS ports can be supported under the condition of not increasing the DMRS overhead, the multi-user pairing of 16 layers of orthogonality is realized, the reduction of interlayer interference among the DMRS is facilitated, and a more accurate channel estimation result is obtained. The above embodiments may be applicable to scenarios where the channel time-varying is relatively slow.

In some embodiments, the first and second sets of OCCs are time domain OCCs. The configuration information table of the demodulation reference signal includes a corresponding relationship between a demodulation reference signal type, a demodulation reference signal port index, a CDM group frequency domain offset, and an OCC, where the OCC includes a frequency domain OCC and a time domain OCC, the time domain OCC includes a first group of OCCs and a second group of OCCs, DMRS types corresponding to the first group of OCCs and the second group of OCCs are different, specifically, the first group of OCCs corresponds to the first demodulation reference signal type, the second group of OCCs corresponds to the second demodulation reference signal type, the first demodulation reference signal type corresponds to the first group of symbols, and the second demodulation reference signal type corresponds to the second group of symbols. The demodulation reference signal type comprises a pre-demodulation reference signal and an extra demodulation reference signal. The sending device may obtain a first group of OCCs corresponding to the first group of symbols and a second group of OCCs corresponding to the second group of symbols according to the configuration information table and the demodulation reference signal type, so as to map the sequence of the demodulation reference signal to the time-frequency resource of the demodulation reference signal according to the obtained OCCs.

In other embodiments, the first set of OCCs and the second set of OCCs are time domain OCCs. The configuration information table of the demodulation reference signal includes a first configuration information table and a second configuration information table, where the demodulation reference signal types corresponding to the first configuration information table and the second configuration information table are different, specifically, the first configuration information table corresponds to the first demodulation reference signal type, and the second configuration information table corresponds to the second demodulation reference signal type. The demodulation reference signal type comprises a preamble demodulation reference signal type and an extra demodulation reference signal type. The first configuration information table comprises a corresponding relation of a demodulation reference signal port index, a CDM group frequency domain offset and an OCC, the OCC comprises a frequency domain OCC and a time domain OCC, and the time domain OCC is the first group of OCCs. The second information configuration table comprises a corresponding relation of a demodulation reference signal port index, a CDM group frequency domain offset and an OCC, the OCC comprises a frequency domain OCC and a time domain OCC, and the time domain OCC is the second group of OCCs.

In some embodiments of the present application, in a case that the first group of OCCs and the second group of OCCs are time domain OCCs, the sending device may map the demodulation reference signal sequence to a time-frequency resource of the demodulation reference signal according to the following formula:

k＝4n+2k′+Δ

k′＝0，1

s＝0，1

n＝0，1，…

j＝0，1，…，v-1

Wherein,

data in which a sequence representing a demodulation reference signal is mapped on RE (k, l), where k is a subcarrier index and l is a symbol index; w_f(k') is the frequency domain OCC, W_t(l ', s) is a time domain OCC, and r (2n + k') is an initial sequence of the demodulation reference signal; Δ is the CDM group frequency domain offset;

is an index of a starting symbol of the demodulation reference signal, l' is a symbol offset of the demodulation reference signal, and v is a number of transmission layers. s is used for identifying the DMRS type, when s is 0, the pre-DMRS is identified, and the time domain OCC is a first group of OCCs; s-1 identifies an additional DMRS, and the time domain OCC is a second group OCC.

In some embodiments, the first and second sets of OCCs are frequency domain OCCs. The configuration information table of the demodulation reference signal includes a corresponding relationship between a demodulation reference signal type, a demodulation reference signal port index, a CDM group frequency domain offset, and an OCC, where the OCC includes a frequency domain OCC and a time domain OCC, the frequency domain OCC includes a first group of OCCs and a second group of OCCs, the demodulation reference signal types corresponding to the first group of OCCs and the second group of OCCs are different, specifically, the first group of OCCs corresponds to the first demodulation reference signal type, the second group of OCCs corresponds to the second demodulation reference signal type, the first demodulation reference signal type corresponds to the first group of symbols, and the second demodulation reference signal type corresponds to the second group of symbols. The demodulation reference signal type comprises a pre-demodulation reference signal and an extra demodulation reference signal. The sending device may obtain a first group of OCCs corresponding to the first group of symbols and a second group of OCCs corresponding to the second group of symbols according to the configuration information table and the demodulation reference signal type, so as to map the sequence of the demodulation reference signal to the time-frequency resource of the demodulation reference signal according to the obtained OCCs.

In other embodiments, the first set of OCCs and the second set of OCCs are time domain OCCs. The configuration information table of the demodulation reference signal comprises a first configuration information table and a second configuration information table, the demodulation reference signal types corresponding to the first configuration information table and the second configuration information table are different, the first configuration information table corresponds to the first demodulation reference signal type, and the second configuration information table corresponds to the second demodulation reference signal type. The demodulation reference signal type comprises a pre-demodulation reference signal and an extra demodulation reference signal. The first configuration information table comprises a corresponding relation of a demodulation reference signal port index, a CDM group frequency domain offset and an OCC, the OCC comprises a frequency domain OCC and a time domain OCC, and the frequency domain OCC is the first group of OCCs. The second information configuration table includes a corresponding relationship among a demodulation reference signal port index, a CDM group frequency domain offset, and an OCC, where the OCC includes a frequency domain OCC and a time domain OCC, and the frequency domain OCC is the second group OCC.

In some embodiments of the present application, in a case that the first group of OCCs and the second group of OCCs are frequency domain OCCs, the sending device may map the demodulation reference signal sequence to a time-frequency resource of the demodulation reference signal according to the following formula:

k＝4n+2k′+Δ

k′＝0，1

s＝0，1

n＝0，1，…

j＝0，1，…，v-1

Wherein,

is an index of a starting symbol of the demodulation reference signal, l' is a symbol offset of the demodulation reference signal, and v is a number of transmission layers. s is used for identifying the DMRS type, when s is 0, the pre-DMRS is identified, and the frequency domain OCC is the first group OCC; s-1 identifies an additional DMRS, and the frequency domain OCC is a second group OCC.

In some embodiments, based on the above formula (6) or formula (7), the process of the transmitting device mapping the sequence of the demodulation reference signals onto the time-frequency resources of the demodulation reference signals may include the following steps:

Wherein the data mapped on RE (k, l)

Equation (6) or equation (7) above is satisfied, that is, the transmitting device may perform processing using equation (6) or equation (7) based on the obtained CDM group frequency domain offset, frequency domain OCC, and time domain OCC, thereby obtaining data on RE (k, l) to which the sequence of the demodulation reference signal is mapped

The implementation process of the embodiment of the present application is described below with reference to formula (6) that needs to be satisfied by the mapping process and with reference to the setting manners of the two different demodulation reference signal configuration information tables, taking DMRS with a configuration Type of a first configuration Type (Type 1 DMRS) as an example.

In some embodiments of the present application, one configuration information table may be set for DMRS, which includes 16 DMRS port indexes, and CDM group frequency domain offset and OCC corresponding to each DMRS port index. The time domain OCC includes a first group of OCCs and a second group of OCCs, where the first group of OCCs corresponds to the first group of symbols and is used for the preamble DMRS, and the second group of OCCs corresponds to the second group of symbols and is used for the additional DMRS, which may specifically be shown in table 13.

Table 13 exemplarily shows a configuration information table of a DMRS provided in an embodiment of the present application.

Table 13: DMRS configuration information of Type 1 DMRS (Parameters for PUSCH DM-RS configuration Type 1 for DMRS)

In the context of Table 13, the following examples are,

denotes a DMRS port index, λ denotes a CDM group index, Δ denotes a CDM group frequency domain offset (the CDM group frequency domain offset values are 0 and 1), W denotes_f(k') is the frequency domain OCC, W_t(l', s) is the time domain OCC. The time domain OCC includes two groups, where a group corresponding to s ═ 0 is a first group OCC, and a group corresponding to s ═ 1 is a second group OCC.

In table 13, DMRS ports with port indexes of 8-15 are newly added ports based on existing ports in the embodiment of the present application. Although the OCCs corresponding to the DMRS ports having port indexes of 0 to 7 are also extended, the extended time domains OCC (2 columns of time domains OCC corresponding to s ═ 1) are all the same as the original time domains OCC (2 columns of time domains OCC corresponding to s ═ 0), so that the OCCs corresponding to the DMRS ports having port indexes of 0 to 7 in table 13 are the same as the OCCs corresponding to the DMRS ports in the original DMRS configuration information table.

Taking the example of configuring 2 symbols, if a transmitting device configures DMRS ports { p0, p1, p4, p5, p10, p11, p14, p15} in CDM group 0 for a receiving device, after generating a DMRS sequence, the transmitting device may query the table 13 according to the DMRS port index to obtain a corresponding OCC, and map the DMRS sequence to a corresponding time-frequency resource according to the queried OCC by using the formula (6).

Taking the time-frequency resource shown in fig. 7 as an example, the sequence of each DMRS port in CDM group 0 may be mapped to the diagonally filled REs in fig. 7.

For 2, l' ═ 0, 1, the preamble DMRS is transmitted on

symbols

2, 3, and the additional DMRS is transmitted on

symbols

8, 9.

When s is equal to 0, the mapping condition of the front DMRS of the DMRS port p8 is:

when k ' is 0, l ' is 0, k is 4n +2k ' + Δ is 0,

wf (k') is 1, W is obtained from the look-up table 13_t(l', s) ═ 1, that is, the frequency domain OCC and the time domain OCC of the sequence of the DMRS port p8 on RE (0, 2) are (1, 1), respectively;

when k ' is 0, l ' is 1, k is 4n +2k ' + Δ is 0,

w is obtained by looking up table 13_f(k′)＝1，W_t(l', s) ═ 1, that is, the frequency domain OCC and the time domain OCC of the sequence of the DMRS port p8 on RE (0, 3) are (1, 1), respectively;

when k ' is 1, l ' is 0, k is 4n +2k ' + Δ is 2,

w is obtained by looking up table 13_f(k′)＝1，W_t(l', s) ═ 1, i.e., the frequency domain OCC and the time domain OCC of the sequence of DMRS port p8 on RE (2, 2) are (1, 1), respectively

When k ═1, l '═ 1, k ═ 4n +2 k' + Δ ═ 2,

w is obtained by looking up table 13_f(k′)＝1，W_t(l', s) ═ 1, that is, the frequency domain OCC and the time domain OCC of the sequence of the DMRS port p8 on RE (2, 3) are (1, 1), respectively;

from the OCCs used by the above DMRS port p8 on the first set of symbols (symbols 2 and 3) of CDM group 0 and the 4 REs corresponding to subcarrier 0 and subcarrier 2, a set of time domain OCCs {1, 1, 1, 1} may be obtained.

When s is 1, the mapping case of the additional DMRS of the DMRS port p8 is:

when k ' is 0, l ' is 0, k is 4n +2k ' + Δ is 0,

W is obtained by looking up table 13_f(k′)＝1，W_t(l', s) — 1, that is, the frequency domain OCC and the time domain OCC of the sequence of the DMRS port p8 on RE (0, 2) are (1, 1), respectively;

when k ' is 0, l ' is 1, k is 4n +2k ' + Δ is 0,

w is obtained by looking up table 13_f(k′)＝1，W_t(l', s) — 1, that is, the frequency domain OCC and the time domain OCC of the sequence of the DMRS port p8 on RE (0, 3) are (1, 1), respectively;

when k ' is 1, l ' is 0, k is 4n +2k ' + Δ is 2,

wf (k') is 1, W is obtained from the look-up table 13_t(l', s) ═ 1, i.e., the frequency domain OCC and the time domain OCC of the sequence of DMRS port p8 on RE (2, 2) are (1, 1), respectively

When k ' is 1, l ' is 1, k is 4n +2k ' + Δ is 2,

w is obtained by looking up table 13_f(k′)＝1，W_t(l', s) — 1, that is, the frequency domain OCC and the time domain OCC of the sequence of the DMRS port p8 on RE (2, 3) are (1, 1), respectively;

from the OCC used by the above DMRS port p8 on the second set of symbols (symbols 8 and 9) of CDM group 0 and the 4 REs corresponding to subcarrier 0 and subcarrier 2, a set of time domain OCCs { -1, -1, -1, -1} may be obtained.

In the same way, a first group of OCCs used by the sequences of other DMRS ports in CDM group 0 on the first group of symbols (symbols 2, 3) and 4 REs corresponding to subcarrier 0 and subcarrier 2, and a second group of OCCs used on the second group of symbols (symbols 8, 9) and 4 REs corresponding to subcarrier 0 and subcarrier 2 can be obtained. Only the first group of OCCs and the second group of OCCs used by the DMRS port p8, DMRS port p9, DMRS port p12 and DMRS port p13 on the above 8 REs are listed in CDM group 0, see fig. 9 for details.

As shown in fig. 9, on the first set of symbols (symbol 2,3) corresponding to CDM group 0, the time domain OCC of the first set of REs (frequency domain 2 REs, time domain 2 symbols) corresponding to port p8 is {1,1, 1,1}, and on the second set of symbols (symbol 8,9) corresponding to CDM group 0, the time domain OCC of the second set of REs corresponding to port p8 is { -1, -1, -1, -1}, which are orthogonal.

The time domain OCC of the first group of REs corresponding to port p9 is {1, -1,1, -1} on the first group of symbols (symbols 2,3) corresponding to CDM group 0, and the time domain OCC of the second group of REs corresponding to port p9 is { -1,1, -1,1} on the second group of symbols (symbols 8,9) corresponding to CDM group 0, the two groups of OCCs being orthogonal.

The time domain OCC of the first group of REs corresponding to port p12 is {1,1, -1, -1} on the first group of symbols (symbols 2,3) corresponding to CDM group 0, and the time domain OCC of the second group of REs corresponding to port p12 is { -1, -1,1,1} on the second group of symbols (symbols 8,9) corresponding to CDM group 0, the two groups of OCCs being orthogonal.

The time domain OCC of the first group of REs corresponding to port p13 is {1, -1, -1,1} on the first group of symbols (symbols 2,3) corresponding to CDM group 0, and the time domain OCC of the second group of REs corresponding to port p13 is { -1,1,1, -1} on the second group of symbols (symbols 8,9) corresponding to CDM group 0, the two groups of OCCs being orthogonal.

In this embodiment of the present application, the first group of symbols and the second group of symbols are combined with the 8 REs corresponding to 2 subcarriers to perform orthogonality, and the time domain OCC may be equivalent to an OCC with a length of 8.

The OCC of the sequence of DMRS ports { p0, p1, p4, p5} in CDM group 0 over 8 REs corresponding to the above two groups of symbols and 2 subcarriers is consistent with that defined in the current standard. In this way, if the DMRS ports in CDM group 0 configured by the transmitting device for the receiving device do not include ports { p8, p9, p12, p13}, there is no need to change the current DMRS sequence mapping method; if the sending device configures at least one of ports { p8, p9, p12, p13} in the DMRS ports in CDM group 0 for the receiving device, DMRS mapping is performed according to the above-described method provided in the embodiment of the present application, so as to ensure that the signals of the newly added 4 DMRS ports are orthogonal to the signals of the original 4 DMRS ports.

In other embodiments of the present application, a first configuration information table and a second configuration information table may be set for the DMRS, where the DMRS type corresponding to the first configuration information table is a pre-DMRS, and the DMRS type corresponding to the second configuration information table is an additional DMRS, and DMRS sequence mapping is performed using the first configuration information table for the pre-DMRS and using the second configuration information table for the additional DMRS. The first configuration information table comprises 16 DMRS port indexes, CDM group frequency domain offset corresponding to each DMRS port index, a frequency domain OCC and a time domain OCC, wherein the time domain OCC is the first group of OCCs. The second configuration information table comprises 16 DMRS port indexes, and CDM group frequency domain offset, a time domain OCC and a frequency domain OCC corresponding to each DMRS port index, wherein the time domain OCC is a second group of OCCs. The first configuration information table may be shown in table 14, and the second configuration information table may be shown in table 15.

Table 14 exemplarily shows a first configuration information table of a DMRS provided in an embodiment of the present application.

Table 14: preamble DMRS configuration information of Type 1 DMRS (Parameters for PUSCH DM-RS configuration Type 1for front-loaded DMRS)

The parameter descriptions in table 14 are substantially the same as those in table 13 and will not be repeated here.

Table 15 illustrates a second configuration information table of an additional DMRS provided in an embodiment of the present application.

Table 15: additional DMRS configuration information for Type 1 DMRS (Parameters for PUSCH DM-RS configuration Type 1for additional DMRS)

The parameter descriptions in table 15 are substantially the same as those in table 13 and will not be repeated here.

If the transmitting device configures the pre-DMRS and the additional DMRS for the receiving device, when mapping the DMRS sequence to the first group of symbols corresponding to the pre-DMRS, obtaining a corresponding OCC according to the table 14, and mapping the DMRS sequence to a corresponding time-frequency resource by using a conventional DMRS mapping formula (e.g., formula 5) according to the obtained OCC; and when the DMRS sequences are mapped to the second group of symbols corresponding to the additional DMRS, obtaining the corresponding OCC according to the table 15, and mapping the DMRS sequences to the corresponding time-frequency resources by adopting a traditional DMRS mapping formula according to the inquired OCC. The detailed implementation can refer to the relevant contents of the foregoing embodiments.

In some embodiments of the present application, one configuration information table may be set for DMRS, which includes 16 DMRS port indexes, and CDM group frequency domain offset and OCC corresponding to each DMRS port index. The frequency domain OCC includes a first group of OCCs and a second group of OCCs, where the first group of OCCs corresponds to the first group of symbols and is used for the preamble DMRS, and the second group of OCCs corresponds to the second group of symbols and is used for the additional DMRS, which may specifically be shown in table 16.

Table 16 exemplarily shows a configuration information table of a DMRS provided in an embodiment of the present application.

Table 16: DMRS configuration information of Type 1 DMRS (Parameters for PUSCH DM-RS configuration Type 1 for DMRS)

In the context of Table 16, the results are,

denotes a DMRS port index, λ denotes a CDM group index, Δ denotes a CDM group frequency domain offset (the CDM group frequency domain offset values are 0 and 1), W denotes_f(k', s) is the frequency domain OCC, W_t(l') is the time domain OCC. The frequency domain OCC includes two sets, where a set of OCCs corresponding to s ═ 0 is a first set of OCCs, and a set of OCCs corresponding to s ═ 1 is a second set of OCCs.

In table 16, DMRS ports with port indexes of 8-15 are newly added ports based on existing ports in the embodiment of the present application. Although the OCCs corresponding to the DMRS ports having port indexes of 0 to 7 are also extended, the extended frequency domains OCC (2 columns of frequency domains OCC corresponding to s ═ 1) are all the same as the original frequency domains OCC (2 columns of frequency domains OCC corresponding to s ═ 0), so that the OCCs corresponding to the DMRS ports having port indexes of 0 to 7 in table 16 are the same as the OCCs corresponding to the DMRS ports in the original DMRS configuration information table.

Taking the example of configuring 2 symbols, if a transmitting device configures DMRS ports { p0, p1, p4, p5, p10, p11, p14, p15} in CDM group 0 for a receiving device, the transmitting device may query the table 16 according to DMRS port indexes after generating DMRS sequences, obtain corresponding OCCs, and map the DMRS sequences to corresponding time-frequency resources according to the queried OCCs by using the formula (7).

Taking the time-frequency resource shown in fig. 7 as an example, the sequence of each DMRS port in CDM group 0 may be mapped to the diagonally filled REs in fig. 7. The sequence of DMRS ports in CDM group 0 is a first group of OCCs used on a first set of symbols (symbols 2,3) and 4 REs corresponding to

subcarriers

0 and 2, and a second group of OCCs used on a second set of symbols (symbols 8,9) and 4 REs corresponding to

subcarriers

0 and 2. Only the first group of OCCs and the second group of OCCs used by the DMRS port p8, DMRS port p9, DMRS port p12 and DMRS port p13 on the above 8 REs are listed in CDM group 0, see fig. 8 for details.

In other embodiments of the present application, a first configuration information table and a second configuration information table may be set for the DMRS, where the DMRS type corresponding to the first configuration information table is a pre-DMRS, and the DMRS type corresponding to the second configuration information table is an additional DMRS, and DMRS sequence mapping is performed using the first configuration information table for the pre-DMRS and using the second configuration information table for the additional DMRS. The first configuration information table comprises 16 DMRS port indexes, CDM group frequency domain offset corresponding to each DMRS port index, a frequency domain OCC and a time domain OCC, wherein the frequency domain OCC is the first group of OCCs. The second configuration information table comprises 16 DMRS port indexes, and CDM group frequency domain offset, a frequency domain OCC and a time domain OCC corresponding to each DMRS port index, wherein the frequency domain OCC is a second group of OCCs. Wherein, the first configuration information table may be as shown in table 17, and the second configuration information table may be as shown in table 18.

Table 17 exemplarily shows a first configuration information table of a DMRS provided in an embodiment of the present application.

Table 17: preamble DMRS configuration information of Type 1 DMRS (Parameters for PUSCH DM-RS configuration Type 1for front-loaded DMRS)

The parameter descriptions in table 17 are substantially the same as those in table 16, and are not repeated here.

Table 18 illustrates a second configuration information table of an additional DMRS provided in an embodiment of the present application.

Table 18: additional DMRS configuration information for Type 1 DMRS (Parameters for PUSCH DM-RS configuration Type 1for additional DMRS)

The parameter descriptions in table 18 are substantially the same as those in table 16, and are not repeated here.

If the transmitting device configures the pre-DMRS and the additional DMRS for the receiving device, when mapping the DMRS sequence to the first group of symbols corresponding to the pre-DMRS, obtaining a corresponding OCC according to the table 17, and mapping the DMRS sequence to a corresponding time-frequency resource by using a conventional DMRS mapping formula (e.g., formula 5) according to the obtained OCC; when the DMRS sequences are mapped to the second group of symbols corresponding to the additional DMRS, the corresponding OCC is obtained according to the table 18, and the DMRS sequences are mapped to the corresponding time frequency resources by adopting a traditional DMRS mapping formula according to the inquired OCC. The detailed implementation can refer to the relevant contents of the foregoing embodiments.

In some embodiments of the present application, the transmitting device may further indicate, to the receiving device, a port index of a demodulation reference signal configured for the receiving device. Specifically, for example, in the downlink DMRS transmission, the network device may send indication information of a demodulation reference signal port index to the terminal device through DCI. Specific implementations can be found in the foregoing examples.

Fig. 10 is a flowchart of a signal transmission method implemented on the receiving device side according to an embodiment of the present application. The method can be applied to the network architecture shown in fig. 1, and can also be applied to other network architectures, which are not limited in the present application. When the method is applied to the network architecture shown in fig. 1, for downlink demodulation reference signal transmission, the transmitting device involved in the method may be the network device 101 in fig. 1, and the receiving device involved in the method may be the terminal devices (102a to 102d) in fig. 1; for uplink demodulation reference signal transmission, the transmitting device involved in the method may be the terminal devices (102a to 102d) in fig. 1, and the receiving device involved in the method may be the network device 101 in fig. 1.

Referring to fig. 10, the method may include the following process flow:

S1001: and the receiving equipment receives the demodulation reference signal sent by the sending equipment on the time-frequency resource of the demodulation reference signal.

For the description of the demodulation reference signal and the demodulation reference signal transmitted by the transmitting device, reference may be made to the relevant contents in fig. 7.

S1002: the receiving device obtains the sequence of the demodulation reference signals.

In some embodiments, the receiving device is configured with a configuration information table of demodulation reference signals. For the description of the configuration information table, reference may be made to the related description in the flow related to fig. 7. The receiving device may process the received demodulation reference signal according to the configuration information table of the demodulation reference signal to obtain a sequence of the demodulation reference signal, and specifically, the method may include the following steps:

The data mapped on the first RE (k, l)

The above formula (6) or formula (7) is satisfied.

Fig. 11 is a flowchart of a signal transmission method implemented at a sending device side according to an embodiment of the present application. The method can be applied to the network architecture shown in fig. 1, and can also be applied to other network architectures, which are not limited in the present application. When the method is applied to the network architecture shown in fig. 1, for downlink demodulation reference signal transmission, the transmitting device involved in the method may be the network device 101 in fig. 1, and the receiving device involved in the method may be the terminal devices (102a to 102d) in fig. 1; for uplink demodulation reference signal transmission, the transmitting device involved in the method may be the terminal devices (102a to 102d) in fig. 1, and the receiving device involved in the method may be the network device 101 in fig. 1.

Referring to fig. 11, the method may include the following process flow:

s1101: the transmitting device generates a sequence of demodulation reference signals.

More specifically, the DMRS may be a DMRS based on DFT-S-OFDM waveforms and CP-OFDM waveforms. Generating a DMRS based on a ZC (Zadoff-Chu) sequence if the DFT-S-OFDM waveform is used; if the CP-OFDM waveform is used, the DMRS is generated based on the gold sequence. For the method for generating the DMRS sequence based on the gold sequence, reference may be made to the foregoing embodiments, and the embodiments of the present application do not limit the manner for generating the DMRS sequence based on the gold sequence.

Taking a DMRS based on a DFT-S-OFDM waveform as an example, a DMRS sequence may be generated based on ZC sequence cyclic shift.

Specifically, the DMRS sequence may be generated using the following formula:

where n is the index of each element in the sequence,

for the total length of the sequence, u ═ 0, 1.. times.29 } is the sequence group index, v is the base sequence number in a certain sequence group, m is the number of RBs allocated by the transmitting device to the receiving device,

is the number of subcarriers included in one RB. For PUSCH transmission, δ ═ 1 and α ═ 0. In addition to this, the present invention is,

Is defined as:

wherein,

N_ZCis less than M_ZCThe maximum prime number of. For the sequence group index u, the values are:

wherein f is_ghIndicating whether or not to perform sequence hopping,

value ofIs limited to the following two cases:

case 1 when the higher layer configures the nPUSCH-Identity parameter and the uplink grant information is not a Random Access Response (RAR) grant or a DCI format 0_0 scrambled by the TC-RNTI, the higher layer configures the nPUSCH-Identity parameter and the uplink grant information is not a Random Access Response (RAR) grant or a DCI format 0_0 scrambled by the TC-RNTI

Configured by the nPUSCH-Identity parameter of the higher layer.

Case 2:

i.e. equal to the cell ID.

Since different cells and different receiving devices can be configured differently

The sequences generated by the different cells have a certain randomness.

S1102: and the sending equipment maps the sequence of the demodulation reference signal to the time-frequency resource of the demodulation reference signal for sending.

The time frequency resources to which the sequence of the demodulation reference signal is mapped may include time frequency resources corresponding to two CDM groups. The time frequency resources corresponding to the first CDM group include frequency domain resources corresponding to a first port of a demodulation reference signal and a second port of the demodulation reference signal in the first CDM group, the frequency domain resources corresponding to the first port are the same as the frequency domain resources corresponding to the second port, and the frequency domain resources corresponding to the first port and the frequency domain resources corresponding to the second port are arranged discontinuously and at equal intervals.

In some embodiments, the frequency domain resources corresponding to one CDM group may be divided into subcarrier groups, each of which may include 2 subcarriers. For example, the frequency domain resources corresponding to one CDM group, in order of subcarrier index from small to large or from large to small, include: a first subcarrier, a second subcarrier, a third subcarrier, a fourth subcarrier, … …, and so on, the first subcarrier and the second subcarrier are divided into a subcarrier group, and the third subcarrier and the fourth subcarrier are divided into a subcarrier group. One PRB (for example, a first PRB) in the frequency domain resource corresponding to the first port and the frequency domain resource corresponding to the second port includes a first subcarrier group and a second subcarrier group, or includes a first subcarrier group, a second subcarrier group, and a third subcarrier group.

For example, taking a DMRS with a configuration Type being a first configuration Type (Type 1 DMRS) as an example, and a time-domain position of the DMRS being a first symbol or two symbols in a slot (i.e., a Front-loaded DMRS), in some embodiments of the present application, in one PRB, time-frequency resource positions of the DMRSs and subcarrier group division situations may be as shown in fig. 4.

As shown in fig. 4, when 1 symbol or 2 symbols are configured, the frequency domain resource corresponding to CDM group 0 includes subcarriers {0,2,4,6,8,10}, where subcarriers {0,2} constitute a first subcarrier group, subcarriers {4,6} constitute a second subcarrier group, and subcarriers {8,10} constitute a third subcarrier group. The frequency domain resources corresponding to CDM group 1 include subcarriers {1,3,5,7,9,11}, where subcarriers {1,3} constitute a first subcarrier group, subcarriers {5,7} constitute a second subcarrier group, and subcarriers {9,11} constitute a third subcarrier group. When 1 symbol is configured, CDM group 0 includes ports { p0, p1, p4, p5}, and CDM group 1 includes ports { p2, p3, p6, p7 }; when 2 symbols are configured, CDM group 0 includes ports { p0, p1, p4, p5, p8, p9, p12, p13}, and CDM group 1 includes ports { p2, p3, p6, p7, p10, p11, p14, p15 }.

The OCC code used by the frequency domain resource corresponding to one port on the RE corresponding to the plurality of subcarriers may form an OCC code sequence. In this embodiment of the present application, a sequence formed by the OCC codes used by the frequency domain resources corresponding to the second port on the REs corresponding to all subcarriers in the at least two subcarrier groups is obtained by cyclically shifting a sequence formed by the OCC codes used by the frequency domain resources corresponding to the first port on the REs corresponding to all subcarriers in the at least two subcarrier groups, and sequences formed by the OCC codes used by the frequency domain resources corresponding to the same port (for example, the first port or the second port) on the REs corresponding to different subcarrier groups are different from each other.

Specifically, in some embodiments, the OCC codes used by the frequency domain resources corresponding to the first port on the REs corresponding to all subcarriers in the first subcarrier group and the second subcarrier group form a first OCC code sequence, and the OCC codes used by the frequency domain resources corresponding to the second port on the REs corresponding to all subcarriers in the first subcarrier group and the second subcarrier group form a second OCC code sequence; the OCC codes used by the frequency domain resources corresponding to the first port or the second port on the REs corresponding to the two subcarriers in the first subcarrier group form a third OCC code sequence, and the OCC codes used on the REs corresponding to the two subcarriers in the second subcarrier group form a fourth OCC code sequence. The second OCC code sequence is obtained by performing cyclic shift on the basis of the first OCC code sequence, and the third OCC code sequence is different from the fourth OCC code sequence.

For example, taking the subcarrier group division case shown in fig. 4 as an example, the OCC codes used by the frequency domain resources corresponding to the first port (p0) and the second port (p8) in CDM group 0 on the corresponding REs are as follows:

frequency domain resources corresponding to the first port (p0), using OCC1 on REs corresponding to the first subcarrier 0 in the first subcarrier group;

frequency domain resources corresponding to the first port (p0), using OCC2 on REs corresponding to the second subcarrier 2 in the first subcarrier group;

frequency domain resources corresponding to the first port (p0), using OCC3 on REs corresponding to the first subcarrier 4 in the second subcarrier group;

frequency domain resources corresponding to the first port (p0), using OCC4 on REs corresponding to the second subcarrier 6 in the second subcarrier group;

frequency domain resources corresponding to the second port (p8), using OCC5 on REs corresponding to the first subcarrier 0 in the first subcarrier group;

frequency domain resources corresponding to the second port (p8), using OCC6 on REs corresponding to the second subcarrier 2 in the first subcarrier group;

frequency domain resources corresponding to the second port (p8), using OCC7 on REs corresponding to the first subcarrier 4 in the second subcarrier group;

the frequency domain resource corresponding to the second port (p8) uses OCC8 on the REs corresponding to the second subcarrier 6 in the second subcarrier group.

OCC 1-OCC 4 form a first OCC sequence with the length of 4, OCC 5-OCC 8 form a second OCC code sequence with the length of 4, and the second OCC code sequence is obtained based on cyclic shift of the first OCC code sequence. OCC1 and OCC2 form a third OCC code sequence, OCC3 and OCC4 form a fourth OCC code sequence, and the third OCC code sequence is different from the fourth OCC code sequence. The sequence formed by OCC5 and OCC6 may be referred to as a third OCC code sequence, and the sequence formed by OCC7 and OCC8 may be referred to as a fourth OCC code sequence.

In other embodiments, the OCC codes of the frequency domain resources corresponding to the first port, which are used on the REs corresponding to all the subcarriers in the first subcarrier group, the second subcarrier group, and the third subcarrier group, form a first OCC code sequence, and the OCC codes of the frequency domain resources corresponding to the second port, which are used on the REs corresponding to all the subcarriers in the first subcarrier group, the second subcarrier group, and the third subcarrier group, form a second OCC code sequence; the frequency domain resources corresponding to the first port or the second port form a third OCC code sequence by using the OCC codes on the REs corresponding to the two subcarriers in the first subcarrier group, form a fourth OCC code sequence by using the OCC codes on the REs corresponding to the two subcarriers in the second subcarrier group, and form a fifth OCC code sequence by using the OCC codes on the REs corresponding to the two carriers in the third subcarrier group. The second OCC code sequence is obtained by performing cyclic shift on the basis of the first OCC code sequence, and any two sequences of the third OCC code sequence, the fourth OCC code sequence and the fifth OCC code sequence are different.

frequency domain resources corresponding to the first port (p0), using OCC5 on REs corresponding to the first subcarrier 8 in the third subcarrier group;

the frequency domain resource corresponding to the first port (p0) uses OCC6 on the REs corresponding to the second subcarrier 10 in the third subcarrier group;

frequency domain resources corresponding to the second port (p8), using OCC7 on REs corresponding to the first subcarrier 0 in the first subcarrier group;

frequency domain resources corresponding to the second port (p8), using OCC8 on REs corresponding to the second subcarrier 2 in the first subcarrier group;

Frequency domain resources corresponding to the second port (p8), using OCC9 on REs corresponding to the first subcarrier 4 in the second subcarrier group;

frequency domain resources corresponding to the second port (p8), using OCC10 on REs corresponding to the second subcarrier 6 in the second subcarrier group;

frequency domain resources corresponding to the second port (p8), using OCC11 on REs corresponding to the first subcarrier 8 in the third subcarrier group;

the frequency domain resource corresponding to the second port (p8) uses OCC12 on the REs corresponding to the second subcarrier 10 in the third subcarrier group.

The OCCs 7-12 form a second OCC code sequence with the length of 6, the OCCs 1-6 form a first OCC sequence with the length of 4, and the second OCC code sequence is obtained based on cyclic shift of the first OCC code sequence. OCC1 and OCC2 form a third OCC code sequence, OCC3 and OCC4 form a fourth OCC code sequence, OCC5 and OCC6 form a fifth OCC code sequence, the third OCC code sequence is different from the fourth OCC code sequence, the fourth OCC code sequence is different from the fifth OCC code sequence, and the third OCC code sequence is different from the fifth OCC code sequence. In this case, the sequence formed by OCC7 and OCC8 may be referred to as a third OCC code sequence, the sequence formed by OCC9 and OCC10 may be referred to as a fourth OCC code sequence, and the sequence formed by OCC11 and OCC12 may be referred to as a fifth OCC code sequence.

In some embodiments, one demodulation reference signal port may correspond to 6M REs, where M is an integer greater than or equal to 1, for example, a value of M may be a scheduled number of PRBs.

Taking the DMRS configuration Type as the first configuration Type (Type 1 DMRS), and the time domain position of the DMRS as one symbol, as shown in fig. 4, in each PRB, DMRS port 0 occupies 6 REs in the frequency domain, and the OCC codes on the 6 REs are { +1, +1, +1, +1, +1, +1 }; DMRS port 1 occupies 6 identical REs in the frequency domain, and the OCC code on the 6 REs is { +1, -1, +1, -1, +1, -1 }. The sequence form can be further converted into a representation form of cyclic shift, such as:

[1 1 1 1 1 1]·diag(s0)＝[1 -1 1 -1 1 -1]

wherein,

wherein diag () means that the elements therein are diagonalized to form a diagonal matrix.

According to

Taking values, the following sequences can be generated:

by complex inner product operation, it can be verified that the generated sequence is orthogonal to the original sequence { +1, +1, +1, +1, +1, +1} and { +1, -1, +1, -1, +1, -1 }.

When extending to M PRBs, there are:

where M is an RE index, that is, M is 0, 1, 2, 3, 4, 5. Phi is the cyclic shift factor.

Similarly, it can be found that sequences obtained when Φ is 2 or Φ is 4 are also orthogonal to the above sequences. Therefore, in the embodiment of the present application, 6 orthogonal sequences may be constructed on 1 DMRS symbol.

In practical implementation, in CDM group 0, if Φ is any two of {1, 2, 4, 5}, then if Φ is combined with the original OCC sequence (i.e., Φ is equal to 0 or Φ is equal to 3), 4 orthogonal sequences can be formed, and further, considering time domain OCC, two DMRS symbols can construct 8 orthogonal sequences, and then two CDM groups can support 16 orthogonal DMRS ports. If the value of phi is all the values in {1, 2, 4, 5}, 24 orthogonal DMRS ports can be constructed at most. Alternatively, the sending device may map the demodulation reference signal sequence to the time-frequency resource of the demodulation reference signal according to the following formula:

k＝4n+2k′+Δ

k′＝0，1

n＝0，1，…

j＝0，1，…，v-1

an index of a starting symbol of the demodulation reference signal, l' is a symbol offset of the demodulation reference signal, and v is a transmission layer number; m is an integer greater than or equal to 1, and may take the value of PRB number, for example, and Φ is a cyclic shift factor.

In other embodiments, still taking the DMRS configuration Type as the first configuration Type (Type 1 DMRS), and the time-domain location of the DMRS as one symbol, as shown in fig. 4, in each PRB, DMRS port 0 occupies 6 REs in the frequency domain, and the OCC codes on the 6 REs are { +1, +1, +1, +1, +1, +1 }; DMRS port 1 occupies 6 identical REs in the frequency domain, and the OCC code on the 6 REs is { +1, -1, +1, -1, +1, -1 }. The sequence form can be further converted into a representation form of cyclic shift. When the number of scheduled RBs is N and 6N is a multiple of 4, the REs corresponding to the same DMRS port may be grouped by every 4 REs to construct OCC codes on different ports. Namely:

[1 1 1 1]·diag(s0)＝[1 -1 1 -1]

Wherein,

When Φ is 0 and Φ is 2, DMRS port 0 and port 1 in CDM group 0 are the same as the OCC codes of DMRS port 2 and port 3 in CDM group 1. When Φ is 1 and Φ is 3, the OCC code corresponding to the newly added port is, for example:

the OCC code of the newly added DMRS port 8 is: [1111] diag (s0) ═ 1 j-1-j (Φ — 1);

the OCC code of the newly added DMRS port 9 is: [1111] diag (s0) ═ 1-j-1 j (Φ — 3);

and so on.

Alternatively, the transmitting device may map the demodulation reference signal sequence to the time domain resource of the demodulation reference signal according to the following formula:

k＝4n+2k′+Δ

k′＝0，1

n＝0，1，…

Fig. 12 illustrates a diagram of an OCC code used when DMRSs are mapped onto REs. As shown in the figure, in REs corresponding to the same DMRS port, every 4 REs are grouped to construct an OCC code on different ports. Although port 0 and port 1 correspond to the same RE, port 0 and port 1 correspond to different phi (i.e., different OCC codes are used), so that orthogonality can be achieved.

In some embodiments, based on the above equation (12) or equation (13), the process of the transmitting device mapping the sequence of the demodulation reference signals onto the time-frequency resources of the demodulation reference signals may include the following steps:

step 1: the sending device obtains a CDM group frequency domain offset, a frequency domain OCC, a time domain OCC, and a cyclic shift factor corresponding to the first RE (k, l) according to the configuration information table, where a subcarrier index of the first RE (k, l) in the time-frequency resource is k, and a symbol index is l;

step 2: sendingThe device obtains data of the sequence mapping of the demodulation reference signal on the first RE (k, l) according to the CDM group frequency domain offset, the frequency domain OCC, the time domain OCC and the cyclic shift factor

The data mapped on the first RE (k, l)

The above formula (12) or formula (13) is satisfied.

According to the above cyclic shift principle, in the embodiment of the present application, the cyclic shift factor may be set in the configuration information table of the demodulation reference signal. Specifically, the configuration information table of the demodulation reference signal includes a corresponding relationship among a demodulation reference signal port index, a CDM group frequency domain offset, an OCC, and a cyclic shift factor, where the OCC includes a frequency domain OCC and a time domain OCC. And the sending equipment acquires the frequency domain OCC, the time domain OCC and the cyclic shift factor corresponding to the demodulation reference signal port index according to the configuration information table, and performs cyclic shift on the acquired frequency domain OCC and time domain OCC according to the acquired cyclic shift factor.

The implementation process of the embodiment of the present application is described below with reference to formula (12) or formula (13) that needs to be satisfied by the mapping process, and with reference to the setting manner of the demodulation reference signal configuration information table, taking a DMRS with a configuration Type of a first configuration Type (Type 1 DMRS) as an example.

In some embodiments of the present application, one configuration information table may be set for DMRS, which includes 16 DMRS port indexes, and CDM group frequency domain offset, OCC, and cyclic shift factor corresponding to each DMRS port index. Specific examples thereof are shown in Table 19.

Table 19: DMRS configuration information of Type 1 DMRS (Parameters for PUSCH DM-RS configuration Type 1)

According to table 19, the OCC of port 8 in CDM group 0 is cyclically shifted based on cyclic shift factor Φ ═ 1 on the OCC of port 0 in the CDM group; the OCC of port 9 in CDM group 0 is obtained by performing cyclic shift based on cyclic shift factor Φ ═ 5 on the OCC of port 0 in the CDM group; the OCC of port 12 in CDM group 0 is obtained by performing cyclic shift based on cyclic shift factor Φ ═ 1 on the OCC of port 4 in the CDM group; the OCC of port 13 in CDM group 0 is obtained by performing cyclic shift based on cyclic shift factor Φ ═ 5 on the OCC of port 4 in the CDM group; the OCC of port 10 in CDM group 1 is obtained by performing cyclic shift based on cyclic shift factor Φ ═ 1 on the OCC of port 2 in the CDM group; the OCC of port 11 in CDM group 1 is obtained by performing cyclic shift based on cyclic shift factor Φ ═ 5 on the OCC of port 2 in the CDM group; the OCC of the port 14 in the CDM group 1 is obtained by performing cyclic shift based on the cyclic shift factor Φ ═ 1 on the OCC of the port 6 in the CDM group; the OCC of port 15 in CDM group 1 is obtained by performing cyclic shift based on cyclic shift factor Φ ═ 1 on the OCC of port 7 in the CDM group.

In some embodiments of the present application, one configuration information table may be set for DMRS, which includes 16 DMRS port indexes, and CDM group frequency domain offset, OCC, and cyclic shift factor corresponding to each DMRS port index. Specific examples thereof are shown in Table 20.

Table 20: DMRS configuration information of Type1 DMRS (Parameters for PUSCH DM-RS configuration Type 1)

In some embodiments of the present application, optionally, the sending device may map the demodulation reference signal sequence to the time domain resource of the demodulation reference signal according to the following formula:

k＝4n+2k′+Δ

k′＝0，1

or t ═ mod (n, 2)

n＝0，1，…

j＝0，1，…，v-1

Based on the above formula, the OCC code for each port is shown in table 21.

Table 21: DMRS configuration information table of Type1 DMRS (Parameters for PUSCH DM-RS configuration Type 1)

It should be noted that tables 19 to 21 only exemplarily show several DMRS configuration information, and based on the above-mentioned principle of cyclic shift, the configuration information tables of DMRSs and possibly other forms are not listed again.

It should be further noted that tables 19 and 20 are only described by indicating 16 ports as an example, and the number of ports in the configuration information table of the DMRS may be extended to 24 ports at most according to the above-mentioned principle of cyclic shift.

In some embodiments of the present application, the sending device may further indicate, to the terminal device, a port index of a demodulation reference signal configured for the terminal device. Specifically, for example, the DMRS transmitted in the downlink is used, the network device may send the indication information of the demodulation reference signal port index to the terminal device through the DCI.

Table 22 exemplarily shows a table of correspondence between DMRS port index indication information and DMRS port index when rank is 1 according to an embodiment of the present application. Wherein, rand-1 indicates that the number of transmission layers is 1, and the transmitting device configures 1DMRS port for the receiving device. maxLength indicates that the maximum preamble number of the DMRS indicates the maximum preamble of the DMRS.

Table 22: DMRS port index indication information and DMRS port index correspondence table (Antenna port(s), transform coder is disabled, DMRS-Type 1, maxLength 2, rank 1)

Table 22 shows values (values) of port index indication information corresponding to DMRS port indexes 0 to 15, where 14 to 21 are indication information newly added on the basis of original indication information in the embodiment of the present application, and indicate DMRS port indexes 8 to 15, respectively. This application does not preclude the DMRS port index from being indicated in other ways.

Table 23 exemplarily shows a table of correspondence between DMRS port index indication information and DMRS port index when rank is 2 according to an embodiment of the present application. Wherein, rand-2 indicates that the number of transmission layers is 2, and the transmitting device configures 2 DMRS ports for the receiving device. maxLength indicates that the maximum preamble number of the DMRS indicates the maximum preamble of the DMRS.

Table 23: DMRS port index indication information and DMRS port index correspondence table (Antenna port(s), transform coder is disabled, DMRS-Type 1, maxLength 2, rank 2)

Table 23 shows values (values) of port index indication information corresponding to DMRS port indexes 0 to 15, where 10 to 17 are indication information newly added on the basis of original indication information in the embodiment of the present application, and respectively indicate a port combination with a DMRS port index greater than or equal to 8. This application does not preclude the DMRS port index from being indicated in other ways.

Table 24 exemplarily shows a table of correspondence between DMRS port index indication information and DMRS port index when rank is 3 according to an embodiment of the present application. Wherein, rand-3 indicates that the number of transmission layers is 3, and the transmitting device configures 3 DMRS ports for the receiving device. maxLength indicates that the maximum preamble number of the DMRS indicates the maximum preamble of the DMRS.

Table 24: DMRS port index indication information and DMRS port index correspondence table (Antenna port(s), transform coder is disabled, DMRS-Type 1, maxLength 2, rank 3)

Table 24 shows values (values) of port index indication information corresponding to DMRS port indexes 0 to 15, where 3 to 7 are indication information newly added on the basis of original indication information in the embodiment of the present application, and respectively indicate a port combination with a DMRS port index greater than or equal to 8. This application does not preclude the DMRS port index from being indicated in other ways.

Table 25 exemplarily shows a table of correspondence between DMRS port index indication information and DMRS port index when rank is 4 according to an embodiment of the present application. Wherein, rand-4 indicates that the number of transmission layers is 4, and the transmitting device configures 4 DMRS ports for the receiving device. maxLength indicates that the maximum preamble number of the DMRS indicates the maximum preamble of the DMRS.

Table 25: DMRS port index indication information and DMRS port index correspondence table (Antenna port(s), transform coder is disabled, DMRS-Type 1, maxLength 2, rank 4)

Table 25 shows values (values) of port index indication information corresponding to DMRS port indexes 0 to 15, where 4 to 6 are indication information newly added on the basis of original indication information in the embodiment of the present application, and respectively indicate a port combination with a DMRS port index greater than or equal to 8. This application does not preclude the DMRS port index from being indicated in other ways.

Fig. 13 is a flowchart of a signal transmission method implemented at a receiving device according to an embodiment of the present application. The method can be applied to the network architecture shown in fig. 1, and can also be applied to other network architectures, which are not limited in the present application. When the method is applied to the network architecture shown in fig. 1, for downlink demodulation reference signal transmission, the transmitting device involved in the method may be the network device 101 in fig. 1, and the receiving device involved in the method may be the terminal devices (102a to 102d) in fig. 1; for uplink demodulation reference signal transmission, the transmitting device involved in the method may be the terminal devices (102a to 102d) in fig. 1, and the receiving device involved in the method may be the network device 101 in fig. 1.

Referring to fig. 13, the method may include the following process flow:

s1201: and the receiving equipment receives the demodulation reference signal sent by the sending equipment on the time-frequency resource of the demodulation reference signal.

The relevant description of the demodulation reference signal and the sending device sending the demodulation reference signal can refer to the relevant contents in fig. 11.

S1202: the receiving device obtains the sequence of the demodulation reference signals.

In some embodiments, the receiving device is configured with a configuration information table of demodulation reference signals. For the description of the configuration information table, reference may be made to the related description in the flow related to fig. 11. The receiving device may process the received demodulation reference signal according to the configuration information table of the demodulation reference signal to obtain a sequence of the demodulation reference signal, and specifically, the method may include the following steps:

step 1: the receiving equipment obtains a CDM group frequency domain offset, a frequency domain OCC, a time domain OCC and a cyclic shift factor corresponding to a first RE (k, l) according to a configuration information table of a demodulation reference signal, wherein a subcarrier index of the first RE (k, l) in the time-frequency resource is k, and a symbol index is l;

step 2: the receiving device obtains data of the demodulation reference signal on the first RE (k, l) according to the CDM group frequency domain offset, the frequency domain OCC and the time domain OCC and the cyclic shift factor

The data mapped on the first RE (k, l)

The above formula (12) or formula (13) or formula (14) is satisfied.

Based on the same inventive concept, an embodiment of the present application further provides a communication apparatus, which may have a structure as shown in fig. 14, where the communication apparatus may be the sending device in the foregoing embodiment, or may be a chip or a chip system capable of supporting the sending device to implement the foregoing method, and when the communication apparatus is the sending device in the foregoing embodiment, the communication apparatus has a behavior function of the sending device in the foregoing method embodiment. The communication apparatus may be a network device for downlink demodulation reference signal transmission, and may be a terminal device for uplink demodulation reference signal transmission.

As shown in fig. 14, the communication apparatus 1300 may include a processing unit 1301 and a transceiving unit 1302. Communication device 1300 may also have a memory unit 1303, and memory unit 1303 may be coupled to processing unit 1301 for storing programs, instructions needed for processing unit 1301 to perform the functions.

Based on the communication apparatus shown in fig. 14, the communication apparatus can implement the method shown in fig. 3.

In particular, in some embodiments, processing unit 1301 may be configured to generate a sequence of demodulation reference signals used to estimate a channel state of the first channel; the transceiving unit 1302 may be configured to map the sequence of the demodulation reference signals to time-frequency resources of the demodulation reference signals for transmission. Wherein the time frequency resource comprises a frequency domain resource corresponding to a first CDM group. Frequency domain resources corresponding to the first CDM group are not continuous and are arranged at equal intervals; a first PRB in the frequency domain resources corresponding to the first CDM group comprises a first group of subcarriers and a second group of subcarriers; the first group of subcarriers and the second group of subcarriers respectively comprise 2 subcarriers, the first group of subcarriers corresponds to a first group of OCCs, the second group of subcarriers corresponds to a second group of OCCs, and the first group of OCCs and the second group of OCCs are orthogonal.

Further, in some embodiments, the first PRB further includes a third group of subcarriers including 2 subcarriers, the third group of subcarriers corresponding to the first group of OCCs.

Further, in some embodiments, the configuration information table of the demodulation reference signal includes a correspondence relationship between a demodulation reference signal port index, a CDM group frequency domain offset, and an OCC, where the OCC includes a frequency domain OCC and a time domain OCC, and the frequency domain OCC includes a first group OCC and a second group OCC.

Further, in some embodiments, the configuration information table of the demodulation reference signal includes a first configuration information table and a second configuration information table; the first configuration information table comprises a corresponding relation of a demodulation reference signal port index, a CDM group frequency domain offset and an OCC, and the OCC comprises a frequency domain OCC and a time domain OCC; the second information configuration table comprises a corresponding relation of demodulation reference signal port indexes, CDM group frequency domain offset and OCC, the OCC comprises a frequency domain OCC and a time domain OCC, the frequency domain OCC comprises a first group of OCC and a second group of OCC, and the second configuration information table is different from the demodulation reference signal port indexes in the first configuration information table.

Further, in some embodiments, processing unit 1301 is further configured to: and obtaining a first group of OCCs corresponding to the first group of subcarriers and a second group of OCCs corresponding to the second group of subcarriers according to the configuration information table.

Further, in some embodiments, processing unit 1301 is configured to: obtaining a CDM group frequency domain offset, a frequency domain OCC and a time domain OCC corresponding to a first RE (k, l) according to the configuration information table, wherein a subcarrier index of the first RE (k, l) in the time-frequency resource is k, and a symbol index is l; obtaining data of the sequence mapping of the demodulation reference signal on the first RE (k, l) according to the CDM group frequency domain offset, the frequency domain OCC and the time domain OCC

The data mapped on the first RE (k, l)

The above formula (4) is satisfied.

Further, in some embodiments, processing unit 1301 is configured to send indication information of the demodulation reference signal port index in the first CDM group to a receiving device.

Further, in some embodiments, a maximum number of demodulation reference signal ports included within the first CDM group is at least 4N, where N is a number of symbols occupied by the demodulation reference signal.

Based on the communication apparatus shown in fig. 14, the communication apparatus can implement the method shown in fig. 7.

In particular, in some embodiments, processing unit 1301 may be configured to generate a sequence of demodulation reference signals used to estimate a channel state of the first channel; the transceiving unit 1302 may be configured to map the sequence of the demodulation reference signals to time-frequency resources of the demodulation reference signals for transmission. The time frequency resources comprise frequency domain resources corresponding to a first CDM group, wherein the frequency domain resources corresponding to the first CDM group are discontinuous and arranged at equal intervals; the time domain resource corresponding to the first CDM group includes a first group of symbols corresponding to the first group of OCCs and a second group of symbols corresponding to the second group of OCCs, and the first group of OCCs is orthogonal to the second group of OCCs.

Further, in some embodiments, the configuration information table of the demodulation reference signal includes a correspondence relationship between a demodulation reference signal type, a demodulation reference signal port index, a CDM group frequency domain offset, and an OCC, where the OCC includes a frequency domain OCC and a time domain OCC, the time domain OCC includes a first group of OCCs and a second group of OCCs, the first group of OCCs corresponds to the first demodulation reference signal type, the second group of OCCs corresponds to the second demodulation reference signal type, the first demodulation reference signal type corresponds to the first group of symbols, and the second demodulation reference signal type corresponds to the second group of symbols.

Further, in some embodiments, the configuration information table of the demodulation reference signal includes a first configuration information table and a second configuration information table, the first configuration information table corresponds to a first demodulation reference signal type, the second configuration information table corresponds to a second demodulation reference signal type, the first demodulation reference signal type corresponds to the first set of symbols, and the second demodulation reference signal type corresponds to the second set of symbols; the first configuration information table comprises a corresponding relation among a demodulation reference signal port index, a CDM group frequency domain offset and an OCC, the OCC comprises a frequency domain OCC and a time domain OCC, and the time domain OCC is the first group of OCCs; the second information configuration table comprises a corresponding relation of a demodulation reference signal port index, a CDM group frequency domain offset and an OCC, the OCC comprises a frequency domain OCC and a time domain OCC, and the time domain OCC is the second group of OCCs.

Further, in some embodiments, the configuration information table of the demodulation reference signal includes a correspondence relationship between a demodulation reference signal type, a demodulation reference signal port index, a CDM group frequency domain offset, and an OCC, where the OCC includes a frequency domain OCC and a time domain OCC, the frequency domain OCC includes a first group of OCCs and a second group of OCCs, the first group of OCCs corresponds to the first demodulation reference signal type, the second group of OCCs corresponds to the second demodulation reference signal type, the first demodulation reference signal type corresponds to the first group of symbols, and the second demodulation reference signal type corresponds to the second group of symbols.

Further, in some embodiments, the configuration information table of the demodulation reference signal includes a first configuration information table and a second configuration information table, the first configuration information table corresponds to a first demodulation reference signal type, the second configuration information table corresponds to a second demodulation reference signal type, the first demodulation reference signal type corresponds to the first set of symbols, and the second demodulation reference signal type corresponds to the second set of symbols; the first configuration information table comprises a corresponding relation among a demodulation reference signal port index, a CDM group frequency domain offset and an OCC, the OCC comprises a frequency domain OCC and a time domain OCC, and the frequency domain OCC is the first group of OCCs; the second information configuration table includes a corresponding relationship among a demodulation reference signal port index, a CDM group frequency domain offset, and an OCC, the OCC includes a frequency domain OCC and a time domain OCC, and the frequency domain OCC is the second group OCC.

Further, in some embodiments, processing unit 1301 is configured to: and obtaining a first group of OCCs corresponding to the first group of symbols and a second group of OCCs corresponding to the second group of symbols according to the configuration information table and the type of the demodulation reference signal.

Further, in some embodiments, The processing unit 1301 maps the sequence of the demodulation reference signal to the time-frequency resource of the demodulation reference signal, including: obtaining a CDM group frequency domain offset, a frequency domain OCC and a time domain OCC corresponding to a first RE (k, l) according to the configuration information table, wherein a subcarrier index of the first RE (k, l) in the time-frequency resource is k, and a symbol index is l; obtaining data of the sequence mapping of the demodulation reference signal on the first RE (k, l) according to the CDM group frequency domain offset, the frequency domain OCC and the time domain OCC

The data mapped on the first RE (k, l)

The above formula (6) or formula (7) is satisfied.

Further, in some embodiments, a maximum number of demodulation reference signal ports included in the first CDM group is at least 4N, where N is a number of symbols included in the first or second set of symbols, and the first and second sets of symbols include the same number of symbols.

Based on the communication apparatus shown in fig. 14, the communication apparatus can implement the method shown in fig. 10.

In particular, in some embodiments, processing unit 1301 may be configured to generate a sequence of demodulation reference signals used to estimate a channel state of the first channel; the transceiving unit 1302 may be configured to map the sequence of the demodulation reference signals to time-frequency resources of the demodulation reference signals for transmission. Wherein, the RE corresponding to the first port of the demodulation reference signal in the first CDM group uses a first OCC, the RE corresponding to the second port of the demodulation reference signal in the first CDM group uses a second OCC, the second OCC is obtained by cyclic shift of the first OCC, and the first OCC is orthogonal to the second OCC.

Further, in some embodiments, the configuration information table of the demodulation reference signal includes a correspondence relationship between a demodulation reference signal port index, a CDM group frequency domain offset, an OCC, and a cyclic shift factor, where the OCC includes a frequency domain OCC and a time domain OCC.

Further, in some embodiments, processing unit 1301 is configured to: and according to the configuration information table, obtaining a frequency domain OCC, a time domain OCC and a cyclic shift factor corresponding to the demodulation reference signal port index, and performing cyclic shift on the obtained frequency domain OCC and the time domain OCC according to the obtained cyclic shift factor.

Further, in some embodiments, processing unit 1301 is configured to: obtaining a CDM group frequency domain offset, a frequency domain OCC, a time domain OCC and a cyclic shift factor corresponding to a first RE (k, l) according to the configuration information table, wherein a subcarrier index of the first RE (k, l) in the time-frequency resource is k, and a symbol index is l; obtaining data of the sequence mapping of the demodulation reference signal on the first RE (k, l) according to the CDM group frequency domain offset, the frequency domain OCC, the time domain OCC and the cyclic shift factor

The data mapped on the first RE (k, l)

The above formula (12) or the above formula (13) or the above formula (14) is satisfied.

Further, in some embodiments, processing unit 1301 is configured to: and sending indication information of the demodulation reference signal port index in the first CDM group to a receiving device.

In addition, an embodiment of the present application further provides a communication apparatus, which may have a structure as shown in fig. 15, where the communication apparatus may be a sending device, or may be a chip or a chip system capable of supporting the sending device to implement the method. The communication apparatus may be a network device for downlink demodulation reference signal transmission, and may be a terminal device for uplink demodulation reference signal transmission.

The communication apparatus 1400 shown in fig. 15 may include at least one processor 1402, where the at least one processor 1402 is configured to couple with a memory, read and execute instructions in the memory to implement the steps involved in the transmitting device in the method provided by the embodiment of the present application. Optionally, the communication device 1400 may further include a transceiver 1401 for supporting the communication device 1400 to receive or transmit signaling or data. The transceiver 1401 in the communication apparatus 1400 may be configured to implement the functions of the transceiver unit 1302, for example, the transceiver 1401 may be configured to enable the communication apparatus 1400 to perform the steps of generating the demodulation reference signal sequence in the method shown in fig. 3, fig. 7, or fig. 10, and the processor 1402 may be configured to implement the functions of the processing unit 1301, for example, the processor 1402 may be configured to enable the communication apparatus 1400 to perform the steps of mapping the demodulation reference signal sequence to the time-frequency resource in the method shown in fig. 3, fig. 7, or fig. 10. Further, a transceiver 1401 can be coupled to the antenna 1403 for enabling the communication device 1400 to communicate. Optionally, the communication apparatus 1400 may further include a memory 1404, wherein computer programs and instructions are stored in the memory 1404, and the memory 1404 may be coupled with the processor 1402 and/or the transceiver 1401 for supporting the processor 1402 to call the computer programs and instructions in the memory 1404 to implement the steps involved in the transmitting device in the method provided by the embodiment of the present application; additionally, the memory 1404 may be used for storing data related to embodiments of the methods of the present application, for example, for storing data, instructions necessary to enable the transceiver 1401 to interact, and/or for storing configuration information necessary for the communication device 1400 to perform the methods of the embodiments of the present application.

Based on the same inventive concept, an embodiment of the present application further provides a communication apparatus, which may have a structure as shown in fig. 16, where the communication apparatus may be the receiving device in the foregoing embodiment, or may be a chip or a chip system capable of supporting the receiving device to implement the foregoing method, and when the communication apparatus is the receiving device in the foregoing embodiment, the communication apparatus has a behavior function of the receiving device in the foregoing method embodiment. For downlink demodulation reference signal transmission, the communication apparatus may be a terminal device, and for uplink demodulation reference signal transmission, the communication apparatus may be a network device.

As shown in fig. 16, the communication apparatus 1500 may include a processing unit 1501 and a transceiving unit 1502. The communication device 1500 may also have a storage unit 1503, which may be coupled to the processing unit 1501 for storing programs, instructions needed by the processing unit 1501 to perform functions.

Based on the communication apparatus shown in fig. 16 described above, the communication apparatus can implement the method shown in fig. 6.

In particular, in some embodiments, the transceiving unit 1502 may be configured to receive a demodulation reference signal transmitted by a transmitting device on a time-frequency resource of the demodulation reference signal, the demodulation reference signal being used for estimating a channel state of a first channel; the processing unit 1501 may be configured to obtain a sequence of the demodulation reference signals. The time frequency resources comprise frequency domain resources corresponding to a first CDM group, wherein the frequency domain resources corresponding to the first CDM group are not continuous and are arranged at equal intervals; a first PRB in the frequency domain resource corresponding to the first CDM group comprises a first group of subcarriers and a second group of subcarriers; the first group of subcarriers and the second group of subcarriers respectively include 2 subcarriers, the first group of subcarriers corresponds to a first group of orthogonal spreading codes (OCCs), the second group of subcarriers corresponds to a second group of OCCs, and the first group of OCCs and the second group of OCCs are orthogonal.

Further, in some embodiments, the processing unit 1501 is further configured to: and obtaining a first group of OCCs corresponding to the first group of subcarriers and a second group of OCCs corresponding to the second group of subcarriers according to the configuration information table.

Further, in some embodiments, the processing unit 1501 is configured to: obtaining a CDM group frequency domain offset, a frequency domain OCC and a time domain OCC corresponding to a first RE (k, l) according to the configuration information table, wherein a subcarrier index of the first RE (k, l) in the time-frequency resource is k, and a symbol index is l; obtaining data of the sequence mapping of the demodulation reference signal on the first RE (k, l) according to the CDM group frequency domain offset, the frequency domain OCC and the time domain OCC

The data mapped on the first RE (k, l)

The above formula (4) is satisfied.

Further, in some embodiments, processing unit 1301 is configured to receive indication information of the demodulation reference signal port index in the first CDM group sent by the sending device.

Based on the communication apparatus shown in fig. 16 described above, the communication apparatus can implement the method shown in fig. 11.

In particular, in some embodiments, the transceiving unit 1502 may be configured to receive a demodulation reference signal transmitted by a transmitting device on a time-frequency resource of the demodulation reference signal, the demodulation reference signal being used for estimating a channel state of a first channel; the processing unit 1501 may be configured to obtain a sequence of the demodulation reference signals. The time frequency resources comprise frequency domain resources corresponding to a first CDM group, wherein the frequency domain resources corresponding to the first CDM group are discontinuous and arranged at equal intervals; the time domain resource corresponding to the first CDM group includes a first group of symbols corresponding to the first group of OCCs and a second group of symbols corresponding to the second group of OCCs, and the first group of OCCs is orthogonal to the second group of OCCs.

Further, in some embodiments, the processing unit 1501 is configured to: and obtaining a first group of OCCs corresponding to the first group of symbols and a second group of OCCs corresponding to the second group of symbols according to the configuration information table and the type of the demodulation reference signal.

Further, in some embodiments, the processing unit 1501 maps the sequence of the demodulation reference signals onto time-frequency resources of the demodulation reference signals, including: according to the configuration information Obtaining a CDM group frequency domain offset, a frequency domain OCC and a time domain OCC corresponding to a first RE (k, l), wherein a subcarrier index of the first RE (k, l) in the time-frequency resource is k, and a symbol index is l; obtaining data of the sequence mapping of the demodulation reference signal on the first RE (k, l) according to the CDM group frequency domain offset, the frequency domain OCC and the time domain OCC

The data mapped on the first RE (k, l)

The above formula (6) or formula (7) is satisfied.

Further, in some embodiments, the processing unit 1501 is configured to receive port index indication information of the demodulation reference signal transmitted by the transmitting device.

Based on the communication apparatus shown in fig. 16 described above, the communication apparatus can implement the method shown in fig. 13.

In particular, in some embodiments, the transceiving unit 1502 may be configured to receive a demodulation reference signal transmitted by a transmitting device on a time-frequency resource of the demodulation reference signal, the demodulation reference signal being used for estimating a channel state of a first channel; the processing unit 1501 may be configured to obtain a sequence of the demodulation reference signals. Wherein, the RE corresponding to the first port of the demodulation reference signal in the first CDM group uses a first OCC, the RE corresponding to the second port of the demodulation reference signal in the first CDM group uses a second OCC, the second OCC is obtained by cyclic shift of the first OCC, and the first OCC is orthogonal to the second OCC.

Further, in some embodiments, the processing unit 1501 is configured to: and according to the configuration information table, obtaining a frequency domain OCC, a time domain OCC and a cyclic shift factor corresponding to the demodulation reference signal port index, and performing cyclic shift on the obtained frequency domain OCC and the time domain OCC according to the obtained cyclic shift factor.

Further, in some embodiments, the processing unit 1501 is configured to: obtaining a CDM group frequency domain offset, a frequency domain OCC, a time domain OCC and a cyclic shift factor corresponding to a first RE (k, l) according to the configuration information table, wherein a subcarrier index of the first RE (k, l) in the time-frequency resource is k, and a symbol index is l; obtaining data of the sequence mapping of the demodulation reference signal on the first RE (k, l) according to the CDM group frequency domain offset, the frequency domain OCC, the time domain OCC and the cyclic shift factor

The data mapped on the first RE (k, l)

Further, in some embodiments, the processing unit 1501 is configured to: and sending indication information of the demodulation reference signal port index in the first CDM group to a receiving device.

In addition, an embodiment of the present application further provides a communication apparatus, which may have a structure as shown in fig. 17, where the communication apparatus may be a receiving device, or may be a chip or a chip system capable of supporting the receiving device to implement the method. For downlink demodulation reference signal transmission, the communication apparatus may be a terminal device, and for uplink demodulation reference signal transmission, the communication apparatus may be a network device.

The communication apparatus 1600 shown in fig. 17 may include at least one processor 1602, where the at least one processor 1602 is configured to couple with a memory, read and execute instructions in the memory to implement the steps involved in the receiving device in the method provided by the embodiment of the present application. Optionally, the communication device 1600 may further include a transceiver 1601 for supporting signaling or data reception or transmission by the communication device 1600. The transceiver 1601 in the communication device 1600 may be configured to implement the functions of the transceiver 1502, for example, the transceiver 1601 may be configured to implement the steps of receiving the demodulation reference signal in the method shown in fig. 6, 10 or 13 performed by the communication device 1600, and the processor 1602 may be configured to implement the functions of the processing unit 1501, for example, the processor 1602 may be configured to implement the steps of obtaining the demodulation reference signal sequence in the method shown in fig. 6, 10 or 13 performed by the communication device 1600. In addition, the transceiver 1601 may be coupled with an antenna 1603 for enabling communications with the communication device 1600. Optionally, the communication apparatus 1600 may further include a memory 1604, in which the computer program and instructions are stored, and the memory 1604 may be coupled with the processor 1602 and/or the transceiver 1601, for enabling the processor 1602 to call the computer program and instructions in the memory 1604 to implement the steps involved in the receiving device in the method provided by the embodiment of the present application; additionally, the memory 1604 may also be used for storing data related to embodiments of the method of the present application, for example, for storing data, instructions necessary to enable the transceiver 1601 to interact with and/or for storing configuration information necessary for the communication device 1600 to perform the method of the embodiments of the present application.

Based on the same concept as the method embodiment, the embodiment of the present application further provides a computer-readable storage medium, on which some instructions are stored, and when the instructions are called by a computer and executed, the instructions may cause the computer to perform the method involved in any one of the possible designs of the method embodiment and the method embodiment. In the embodiment of the present application, the computer-readable storage medium is not limited, and may be, for example, a RAM (random-access memory), a ROM (read-only memory), and the like.

Based on the same concept as the above method embodiments, the present application also provides a computer program product, which when called by a computer can perform the method as referred to in the method embodiments and any possible design of the above method embodiments.

Based on the same concept as the above method embodiments, the present application also provides a chip, which may include a processor and an interface circuit, for implementing the method as referred to in any one of the possible implementations of the above method embodiments, wherein "coupled" means that two components are directly or indirectly joined to each other, which may be fixed or movable, which may allow flowing liquid, electric, electrical or other types of signals to be communicated between the two components.

In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the invention to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website site, computer, server, or data center to another website site, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.

The various illustrative logical units and circuits described in this application may be implemented or operated upon by design of a general purpose processor, a digital signal processor, an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof. A general-purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices, e.g., a digital signal processor and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a digital signal processor core, or any other similar configuration.

The steps of a method or algorithm described in the embodiments herein may be embodied directly in hardware, in a software element executed by a processor, or in a combination of the two. The software cells may be stored in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. For example, a storage medium may be coupled to the processor such the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor. The processor and the storage medium may reside in an ASIC, which may be disposed in a terminal device. In the alternative, the processor and the storage medium may reside as discrete components in a terminal device.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

Although the invention has been described in connection with specific features and embodiments thereof, it will be apparent that various modifications and combinations can be made therein without departing from the scope of the invention. Accordingly, the specification and figures are merely exemplary of the invention as defined in the appended claims and are intended to cover any and all modifications, variations, combinations, or equivalents within the scope of the invention. It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. A signal transmission method, comprising:

the sending equipment maps the sequence of the demodulation reference signal to the time-frequency resource of the demodulation reference signal for sending; the time frequency resources comprise frequency domain resources corresponding to a first Code Division Multiplexing (CDM) group, wherein the frequency domain resources corresponding to the first CDM group are not continuous and are arranged at equal intervals; a first physical resource block PRB in the frequency domain resources corresponding to the first CDM group comprises a first group of subcarriers and a second group of subcarriers; the first group of subcarriers and the second group of subcarriers respectively include 2 subcarriers, the first group of subcarriers corresponds to a first group of orthogonal spreading codes (OCCs), the second group of subcarriers corresponds to a second group of OCCs, and the first group of OCCs and the second group of OCCs are orthogonal.

2. The method of claim 1, wherein the configuration information table of the demodulation reference signal comprises a correspondence of a demodulation reference signal port index, a CDM group frequency domain offset, and an OCC, wherein the OCC comprises a frequency domain OCC and a time domain OCC, and the frequency domain OCC comprises a first group OCC and a second group OCC.

3. The method of claim 1, wherein the configuration information table of the demodulation reference signal comprises a first configuration information table and a second configuration information table;

4. The method of claim 2 or 3, wherein the transmitting device maps the sequence of the demodulation reference signals onto time-frequency resources of the demodulation reference signals, comprising:

The data mapped on the first RE (k, l)

Satisfies the following conditions:

k＝4n+2k′+Δ

k′＝0，1

t＝mod(n,2)

n＝0,1,…

j＝0,1,…,v-1

5. A signal transmission method, comprising:

the sending equipment maps the sequence of the demodulation reference signal to the time-frequency resource of the demodulation reference signal for sending; the time frequency resources comprise frequency domain resources corresponding to a first Code Division Multiplexing (CDM) group, wherein the frequency domain resources corresponding to the first CDM group are not continuous and are arranged at equal intervals; the time domain resources corresponding to the first CDM group include a first group of symbols and a second group of symbols, the first group of symbols corresponds to a first group of orthogonal spreading codes, OCCs, the second group of symbols corresponds to a second group of OCCs, and the first group of OCCs is orthogonal to the second group of OCCs.

6. The method of claim 5, wherein the configuration information table of the demodulation reference signal comprises a correspondence relationship among a demodulation reference signal type, a demodulation reference signal port index, a CDM group frequency domain offset, and an OCC, wherein the OCC comprises a frequency domain OCC and a time domain OCC, the time domain OCC comprises a first group OCC and a second group OCC, the first group OCC corresponds to a first demodulation reference signal type, the second group OCC corresponds to a second demodulation reference signal type, the first demodulation reference signal type corresponds to the first group of symbols, and the second demodulation reference signal type corresponds to the second group of symbols.

7. The method of claim 6, wherein the transmitting device maps the sequence of the demodulation reference signals onto time-frequency resources of the demodulation reference signals, comprising:

The data mapped on the first RE (k, l)

Satisfies the following conditions:

k＝4n+2k′+Δ

k′＝0,1

s＝0,1

n＝0,1,…

j＝0,1,…,v-1

8. The method of claim 5, wherein the configuration information table of the demodulation reference signal comprises a correspondence relationship among a demodulation reference signal type, a demodulation reference signal port index, a CDM group frequency domain offset, and an OCC, wherein the OCC comprises a frequency domain OCC and a time domain OCC, the frequency domain OCC comprises a first group OCC and a second group OCC, the first group OCC corresponds to a first demodulation reference signal type, the second group OCC corresponds to a second demodulation reference signal type, the first demodulation reference signal type corresponds to the first group of symbols, and the second demodulation reference signal type corresponds to the second group of symbols.

9. The method of claim 8, wherein the transmitting device maps the sequence of demodulation reference signals onto time-frequency resources of the demodulation reference signals, comprising:

The data mapped on the first RE (k, l)

Satisfies the following conditions:

k＝4n+2k′+Δ

k′＝0,1

s＝0,1

n＝0,1,…

j＝0,1,…,v-1

10. A signal transmission method, comprising:

Wherein:

the time-frequency resources comprise frequency domain resources corresponding to a first port of a demodulation reference signal and a second port of the demodulation reference signal in a first Code Division Multiplexing (CDM) group, the frequency domain resources corresponding to the first port are the same as the frequency domain resources corresponding to the second port, the frequency domain resources corresponding to the first port and the frequency domain resources corresponding to the second port are not continuous and are arranged at equal intervals, a first Physical Resource Block (PRB) in the frequency domain resources corresponding to the first port and the frequency domain resources corresponding to the second port comprises at least two subcarrier groups, each of the at least two subcarrier groups comprises two subcarriers, and the at least two subcarrier groups comprise a first subcarrier group and a second subcarrier group or comprise a first subcarrier group, a second subcarrier group and a third subcarrier group;

11. The method of claim 10, wherein the configuration information table of the demodulation reference signal includes a correspondence of a demodulation reference signal port index, a CDM group frequency domain offset, an OCC, and a cyclic shift factor, wherein the OCC includes a frequency domain OCC and a time domain OCC;

the method further comprises the following steps:

and the sending equipment acquires the frequency domain OCC, the time domain OCC and the cyclic shift factor corresponding to the demodulation reference signal port index according to the configuration information table, and performs cyclic shift on the acquired frequency domain OCC and time domain OCC according to the acquired cyclic shift factor.

12. The method of any one of claims 10-11, wherein the transmitting device mapping the sequence of demodulation reference signals onto time-frequency resources of the demodulation reference signals, comprises:

The data mapped on the first RE (k, l)

Satisfies the following conditions:

k＝4n+2k′+Δ

k′＝0,1

n＝0,1,…

j＝0,1,…,v-1

or, the data mapped on the first RE (k, l)

Satisfies the following conditions:

k＝4n+2k′+Δ

k′＝0,1

n＝0,1,…

j＝0,1,…,v-1

13. A signal transmission method, comprising:

the method comprises the steps that a receiving device receives a demodulation reference signal sent by a sending device on a time-frequency resource of the demodulation reference signal, wherein the demodulation reference signal is used for estimating a channel state of a first channel; the time frequency resources comprise frequency domain resources corresponding to a first Code Division Multiplexing (CDM) group, wherein the frequency domain resources corresponding to the first CDM group are not continuous and are arranged at equal intervals; a first physical resource block PRB in the frequency domain resources corresponding to the first CDM group comprises a first group of subcarriers and a second group of subcarriers; the first group of subcarriers and the second group of subcarriers respectively comprise 2 subcarriers, the first group of subcarriers corresponds to a first group of orthogonal spreading codes (OCCs), the second group of subcarriers corresponds to a second group of OCCs, and the first group of OCCs and the second group of OCCs are orthogonal;

14. The method of claim 13, wherein the configuration information table of the demodulation reference signal comprises a correspondence of a demodulation reference signal port index, a CDM group frequency domain offset, and an OCC, wherein the OCC comprises a frequency domain OCC and a time domain OCC, and the frequency domain OCC comprises a first group OCC and a second group OCC.

15. The method of claim 13, wherein the configuration information table of the demodulation reference signal comprises a first configuration information table and a second configuration information table;

16. The method of claim 14 or 15, wherein the receiving device obtaining the sequence of demodulation reference signals comprises:

the frequency domain OCC, the frequency domain offset and the CDM groupThe time domain OCC obtains data of the demodulation reference signal sequence mapped on the first RE (k, l)

The data mapped on the first RE (k, l)

Satisfies the following conditions:

k＝4n+2k′+Δ

k′＝0,1

t＝mod(n,2)

n＝0,1,…

j＝0,1,…,v-1

17. A signal transmission method, comprising:

the method comprises the steps that a receiving device receives a demodulation reference signal sent by a sending device on a time-frequency resource of the demodulation reference signal, wherein the demodulation reference signal is used for estimating a channel state of a first channel; the time frequency resources comprise frequency domain resources corresponding to a first Code Division Multiplexing (CDM) group, wherein the frequency domain resources corresponding to the first CDM group are not continuous and are arranged at equal intervals; the time domain resources corresponding to the first CDM group comprise a first group of symbols and a second group of symbols, the first group of symbols corresponds to a first group of orthogonal spreading codes, OCCs, the second group of symbols corresponds to a second group of OCCs, and the first group of OCCs is orthogonal to the second group of OCCs;

18. The method of claim 17, wherein the table of configuration information of the demodulation reference signal comprises a correspondence relationship among a demodulation reference signal type, a demodulation reference signal port index, a CDM group frequency domain offset, and an OCC, wherein the OCC comprises a frequency domain OCC and a time domain OCC, the time domain OCC comprises a first group of OCCs and a second group of OCCs, the first group of OCCs corresponds to a first demodulation reference signal type, the second group of OCCs corresponds to a second demodulation reference signal type, the first demodulation reference signal type corresponds to the first group of symbols, and the second demodulation reference signal type corresponds to the second group of symbols.

19. The method of claim 18, wherein the receiving device obtaining the sequence of demodulation reference signals comprises:

The data mapped on the first RE (k, l)

Satisfies the following conditions:

k＝4n+2k′+Δ

k′＝0,1

s＝0,1

n＝0,1,…

j＝0,1,…,v-1

20. The method of claim 17, wherein the table of configuration information of the demodulation reference signal comprises a correspondence relationship among a demodulation reference signal type, a demodulation reference signal port index, a CDM group frequency domain offset, and an OCC, wherein the OCC comprises a frequency domain OCC and a time domain OCC, the frequency domain OCC comprises a first group of OCCs and a second group of OCCs, the first group of OCCs corresponds to the first demodulation reference signal type, the second group of OCCs corresponds to the second demodulation reference signal type, the first demodulation reference signal type corresponds to the first group of symbols, and the second demodulation reference signal type corresponds to the second group of symbols.

21. The method of claim 20, wherein the receiving device obtaining the sequence of demodulation reference signals comprises:

The data mapped on the first RE (k, l)

Satisfies the following conditions:

k＝4n+2k′+Δ

k′＝0，1

s＝0,1

n＝0，1，…

j＝0，1,…，v-1

22. A signal transmission method, comprising:

Wherein:

23. The method of claim 22, wherein the configuration information table of the demodulation reference signal comprises a correspondence of a demodulation reference signal port index, a CDM group frequency domain offset, an OCC, and a cyclic shift factor, wherein the OCC comprises a frequency domain OCC and a time domain OCC;

the method further comprises the following steps:

and the receiving equipment acquires the frequency domain OCC, the time domain OCC and the cyclic shift factor corresponding to the demodulation reference signal port index according to the configuration information table, and performs cyclic shift on the acquired frequency domain OCC and time domain OCC according to the acquired cyclic shift factor.

24. The method of claim 22 or 23, wherein the receiving device obtaining the sequence of demodulation reference signals comprises:

The data mapped on the first RE (k, l)

Satisfies the following conditions:

k＝4n+2k′+Δ

k′＝0，1

n＝0,1,…

j＝0,1,…，v-1

or, the data mapped on the first RE (k, l)

Satisfies the following conditions:

k＝4n+2k′+Δ

k′＝0，1

n＝0,1,…

j＝0,1,…，v-1

25. A communications device comprising at least one processor coupled to a memory, the at least one processor configured to read and execute a program stored in the memory to cause the device to perform:

mapping the sequence of the demodulation reference signal to a time frequency resource of the demodulation reference signal for transmission; the time frequency resources comprise frequency domain resources corresponding to a first Code Division Multiplexing (CDM) group, wherein the frequency domain resources corresponding to the first CDM group are not continuous and are arranged at equal intervals; a first physical resource block PRB in the frequency domain resources corresponding to the first CDM group comprises a first group of subcarriers and a second group of subcarriers; the first group of subcarriers and the second group of subcarriers respectively include 2 subcarriers, the first group of subcarriers corresponds to a first group of orthogonal spreading codes (OCCs), the second group of subcarriers corresponds to a second group of OCCs, and the first group of OCCs and the second group of OCCs are orthogonal.

26. The communications apparatus of claim 25, wherein the configuration information table of the demodulation reference signal includes a correspondence of a demodulation reference signal port index, a CDM group frequency domain offset, and an OCC, wherein the OCC includes a frequency domain OCC and a time domain OCC, and the frequency domain OCC includes a first group OCC and a second group OCC.

27. The communications apparatus of claim 25, wherein the configuration information table of the demodulation reference signal comprises a first configuration information table and a second configuration information table;

28. The communications apparatus of claim 26 or 27, wherein the mapping the sequence of demodulation reference signals onto time-frequency resources of the demodulation reference signals comprises:

The data mapped on the first RE (k, l)

Satisfies the following conditions:

k＝4n+2k′+Δ

k′＝0，1

t＝mod(n,2)

n＝0，1，…

j＝0,1,…,v-1

29. A communications device comprising at least one processor coupled to a memory, the at least one processor configured to read and execute a program stored in the memory to cause the device to perform:

Mapping the sequence of the demodulation reference signal to a time frequency resource of the demodulation reference signal for transmission; the time frequency resources comprise frequency domain resources corresponding to a first Code Division Multiplexing (CDM) group, wherein the frequency domain resources corresponding to the first CDM group are not continuous and are arranged at equal intervals; the time domain resources corresponding to the first CDM group include a first group of symbols and a second group of symbols, the first group of symbols corresponds to a first group of orthogonal spreading codes, OCCs, the second group of symbols corresponds to a second group of OCCs, and the first group of OCCs is orthogonal to the second group of OCCs.

30. The communications apparatus of claim 29, wherein the table of configuration information of the demodulation reference signal includes a correspondence relationship among a demodulation reference signal type, a demodulation reference signal port index, a CDM group frequency domain offset, and an OCC, wherein the OCC includes a frequency domain OCC and a time domain OCC, the time domain OCC includes a first group of OCCs and a second group of OCCs, the first group of OCCs corresponds to a first demodulation reference signal type, the second group of OCCs corresponds to a second demodulation reference signal type, the first demodulation reference signal type corresponds to the first group of symbols, and the second demodulation reference signal type corresponds to the second group of symbols.

31. The communications apparatus of claim 30, wherein the mapping the sequence of demodulation reference signals onto time-frequency resources of the demodulation reference signals comprises:

The data mapped on the first RE (k, l)

Satisfies the following conditions:

k＝4n+2k′+Δ

k′＝0,1

s＝0,1

n＝0,1,…

j＝0，1,…，v-1

an index of a starting symbol of the demodulation reference signal, l' is a symbol offset of the demodulation reference signal, and v is a transmission layer number; wherein, when s is 0, thenThe time domain OCC is a first group of OCCs; s is 1, and the time domain OCC is a second group OCC.

32. The communications apparatus of claim 29, wherein the table of configuration information of the demodulation reference signal includes a correspondence relationship among a demodulation reference signal type, a demodulation reference signal port index, a CDM group frequency domain offset, and an OCC, wherein the OCC includes a frequency domain OCC and a time domain OCC, the frequency domain OCC includes a first group of OCCs and a second group of OCCs, the first group of OCCs corresponds to a first demodulation reference signal type, the second group of OCCs corresponds to a second demodulation reference signal type, the first demodulation reference signal type corresponds to the first group of symbols, and the second demodulation reference signal type corresponds to the second group of symbols.

33. The communications apparatus of claim 32, wherein the mapping the sequence of demodulation reference signals onto time-frequency resources of the demodulation reference signals comprises:

The data mapped on the first RE (k, l)

Satisfies the following conditions:

k＝4n+2k′+Δ

k′＝0，1

s＝0,1

n＝0,1，…

j＝0,1，…，v-1

34. A communications device comprising at least one processor coupled to a memory, the at least one processor configured to read and execute a program stored in the memory to cause the device to perform:

mapping the sequence of the demodulation reference signal to a time frequency resource of the demodulation reference signal for transmission;

wherein:

35. The apparatus of claim 34, wherein the configuration information table of the demodulation reference signal comprises a correspondence of a demodulation reference signal port index, a CDM group frequency domain offset, an OCC, and a cyclic shift factor, wherein the OCC comprises a frequency domain OCC and a time domain OCC;

the processor is further configured to:

and according to the configuration information table, obtaining a frequency domain OCC, a time domain OCC and a cyclic shift factor corresponding to the demodulation reference signal port index, and performing cyclic shift on the obtained frequency domain OCC and the time domain OCC according to the obtained cyclic shift factor.

36. The method of claim 34 or 35, wherein the processor is specifically configured to:

The data mapped on the first RE (k, l)

Satisfies the following conditions:

k＝4n+2k′+Δ

k′＝0,1

n＝0,1,…

j＝0,1,…,v-1

or, the data mapped on the first RE (k, l)

Satisfies the following conditions:

k＝4n+2k′+Δ

k′＝0,1

n＝0,1,…

j＝0,1,…,v-1

37. A communications device comprising at least one processor coupled to a memory, the at least one processor configured to read and execute a program stored in the memory to cause the device to perform:

receiving a demodulation reference signal sent by sending equipment on a time-frequency resource of the demodulation reference signal, wherein the demodulation reference signal is used for estimating a channel state of a first channel; the time frequency resources comprise frequency domain resources corresponding to a first Code Division Multiplexing (CDM) group, wherein the frequency domain resources corresponding to the first CDM group are not continuous and are arranged at equal intervals; a first physical resource block PRB in the frequency domain resources corresponding to the first CDM group comprises a first group of subcarriers and a second group of subcarriers; the first group of subcarriers and the second group of subcarriers respectively comprise 2 subcarriers, the first group of subcarriers corresponds to a first group of orthogonal spreading codes (OCCs), the second group of subcarriers corresponds to a second group of OCCs, and the first group of OCCs and the second group of OCCs are orthogonal;

Obtaining a sequence of the demodulation reference signals.

38. The communications apparatus of claim 37, wherein the table of configuration information of the demodulation reference signal includes a correspondence of a demodulation reference signal port index, a CDM group frequency domain offset, and an OCC, wherein the OCC includes a frequency domain OCC and a time domain OCC, and the frequency domain OCC includes a first group OCC and a second group OCC.

39. The communications apparatus of claim 37, wherein the configuration information table of the demodulation reference signal comprises a first configuration information table and a second configuration information table;

40. The communications apparatus of claim 38 or 39, wherein the obtaining the sequence of demodulation reference signals comprises:

The data mapped on the first RE (k, l)

Satisfies the following conditions:

k＝4n+2k′+Δ

k′＝0,1

t＝mod(n,2)

n＝0,1,…

j＝0,1,…,v-1

41. A communications device comprising at least one processor coupled to a memory, the at least one processor configured to read and execute a program stored in the memory to cause the device to perform:

receiving a demodulation reference signal sent by sending equipment on a time-frequency resource of the demodulation reference signal, wherein the demodulation reference signal is used for estimating a channel state of a first channel; the time frequency resources comprise frequency domain resources corresponding to a first Code Division Multiplexing (CDM) group, wherein the frequency domain resources corresponding to the first CDM group are not continuous and are arranged at equal intervals; the time domain resources corresponding to the first CDM group comprise a first group of symbols and a second group of symbols, the first group of symbols corresponds to a first group of orthogonal spreading codes, OCCs, the second group of symbols corresponds to a second group of OCCs, and the first group of OCCs is orthogonal to the second group of OCCs;

Obtaining a sequence of the demodulation reference signals.

42. The communications apparatus of claim 41, wherein the configuration information table of the demodulation reference signal comprises a correspondence of a demodulation reference signal type, a demodulation reference signal port index, a CDM group frequency domain offset, and an OCC, wherein the OCC comprises a frequency domain OCC and a time domain OCC, the time domain OCC comprises a first group of OCCs and a second group of OCCs, the first group of OCCs corresponds to a first demodulation reference signal type, the second group of OCCs corresponds to a second demodulation reference signal type, the first demodulation reference signal type corresponds to the first group of symbols, and the second demodulation reference signal type corresponds to the second group of symbols.

43. The communications apparatus of claim 42, wherein the obtaining the sequence of demodulation reference signals comprises:

The data mapped on the first RE (k, l)

Satisfies the following conditions:

k＝4n+2k′+Δ

k′＝0,1

s＝0,1

n＝0,1,…

j＝0,1,…,v-1

44. The communications apparatus of claim 41, wherein the configuration information table of the demodulation reference signal comprises a correspondence relationship among a demodulation reference signal type, a demodulation reference signal port index, a CDM group frequency domain offset, and an OCC, wherein the OCC comprises a frequency domain OCC and a time domain OCC, the frequency domain OCC comprises a first group OCC and a second group OCC, the first group OCC corresponds to a first demodulation reference signal type, the second group OCC corresponds to a second demodulation reference signal type, the first demodulation reference signal type corresponds to the first group of symbols, and the second demodulation reference signal type corresponds to the second group of symbols.

45. The communications apparatus of claim 44, wherein the obtaining the sequence of demodulation reference signals comprises:

The data mapped on the first RE (k, l)

Satisfies the following conditions:

k＝4n+2k′+Δ

k′＝0,1

s＝0,1

n＝0,1,…

j＝0,1,…,v-1

46. A communications device comprising at least one processor coupled to a memory, the at least one processor configured to read and execute a program stored in the memory to cause the device to perform:

Obtaining a sequence of the demodulation reference signals;

wherein:

47. The apparatus of claim 46, wherein the configuration information table of the demodulation reference signal comprises a correspondence of a demodulation reference signal port index, a CDM group frequency domain offset, an OCC and a cyclic shift factor, wherein the OCC comprises a frequency domain OCC and a time domain OCC;

the processor is further configured to:

48. The apparatus of claim 46 or 47, wherein the processor is specifically configured to:

The data mapped on the first RE (k, l)

Satisfies the following conditions:

k＝4n+2k′+Δ

k′＝0,1

n＝0,1,…

j＝0,1,…,v-1

or, the data mapped on the first RE (k, l)

Satisfies the following conditions:

k＝4n+2k′+Δ

k′＝0,1

n＝0,1,…

j＝0,1,…,v-1

49. A chip coupled to a memory for reading and executing program instructions stored in the memory to implement the method of any one of claims 1-24.

50. A computer-readable storage medium having stored thereon computer instructions which, when executed on a computer, cause the computer to perform the method of any one of claims 1-24.

51. A computer program product, which, when called by a computer, causes the computer to perform the method of any one of claims 1 to 24.