WO2017101607A1

WO2017101607A1 - Method and device for transmitting data

Info

Publication number: WO2017101607A1
Application number: PCT/CN2016/104924
Authority: WO
Inventors: 陈宪明; 戴博; 石靖; 夏树强; 张雯; 方惠英
Original assignee: 中兴通讯股份有限公司
Priority date: 2015-12-16
Filing date: 2016-11-07
Publication date: 2017-06-22

Abstract

Provided in the present invention are a method and a device for transmitting data. The method comprises: transmitting physical downlink channel data according to a first type of reference signal (RS) or a second type of RS or a third type of RS. By means of said method of the present invention, the balance between the data transmission performances and RS overheads of different physical downlink channel data in an NB-IoT is ensured, thereby solving the problem in the related art of being undetermined which type of RS is referenced for transmitting NB-IoT physical channel data.

Description

Data transmission method and device

Technical field

The present invention relates to the field of communications, and in particular to a method and apparatus for transmitting data.

Background technique

In order to meet the needs of Cellular Internet Of Things (C-IOT), a new access system named NarrowBand-Cellular Internet Of Things (NB-IOT) was designed to cooperate in the third generation. The 3rd Generation Partnership Project (3GPP) organization was proposed and agreed in the 69th plenary meeting. Among them, the NB-IOT system focuses on low-complexity and low-throughput RF access technologies. The main research objectives include: improved indoor coverage, support for massive low-throughput user equipment, low latency sensitivity, and ultra-low Equipment cost, low equipment power loss and network architecture. The uplink and downlink transmission bandwidth of the NB-IOT system is 180 kHz, which is the same as the bandwidth of a Physical Resource Block (PRB) of the Long Term Evolution (LTE) system, which is beneficial to the NB- The design of the existing LTE system is reused in the IOT system.

The NB-IOT system supports three different modes of operation: 1) Stand-alone operation, for example, using one of the spectrum currently used by the GERAN (GSM EDGE Radio Access Network) system instead of one or more GSM carriers; Guard band operation, for example using one resource block that is not used within one LTE carrier guard band; 3) In-band operation, for example using a resource within a normal LTE carrier range Piece. NB-IOT physical channel data, such as a physical broadcast channel (PBCH), a physical downlink shared channel (Physical Downlink Shared Channel, PDSCH for short), and physical, in accordance with a reference signal. There is no effective solution for the downlink control channel (Physical Downlink Control Channel, PDCCH for short).

Summary of the invention

The embodiments of the present invention provide a data transmission method and apparatus, so as to at least solve the problem that the NB-IOT physical channel data is not transmitted according to any reference signal in the related art.

According to an aspect of the embodiments of the present invention, a data transmission method is provided, including: transmitting physical downlink channel data according to one of the following reference signals RS; wherein the RS includes: a first type RS, a second type RS And the third type of RS.

Optionally, the first type of RS pattern does not overlap with the Long Term Evolution (LTE) system cell-specific reference signal CRS pattern; the second type of RS pattern is the same as the LTE system CRS pattern, or the second type of RS The pattern is a sub-pattern of the LTE system CRS pattern; the third type RS pattern is a superposition of the first type RS pattern and the second type RS pattern.

Optionally, the RS is a 2-port RS.

Optionally, in the in-band operation, when the physical downlink channel data is transmitted according to the second type of RS and the 4-port LTE system CRS is configured, the second type of RS is a designated 2-port LTE system CRS, where The designated 2 port is port 0 and port 1, or port 0 and port 2, or port 1 and port 3.

Optionally, when the physical downlink channel data is transmitted according to the third type of RS, the third type of RS is a superposition of a 2-port type RS and a 2-port first type RS; wherein, the first The first port of the RS of the second type is the same port as the first port of the second type of RS, and the second port of the first type of RS is the same port as the second port of the second type of RS.

Optionally, in the in-band operation, when the 4-port LTE system CRS is configured, the 2-port second-class RS is a designated 2-port LTE system CRS, and the designated 2-port is port 0 and port 1. , or port 0 and port 2, or port 1 and port 3.

Optionally, the designated 2 port is fixed to port 0 and port 1; or the designated 2 port varies with a subframe; wherein, when the designated 2 port changes with a subframe, in a part of the subframe, The designated 2 ports are port 0 and port 2, and in another partial subframe, the designated 2 ports are port 1 and port 3.

Optionally, the non-overlapping of the first type of RS pattern with the LTE system CRS pattern includes: when the subframe in which the physical downlink channel data is transmitted is a normal subframe, the first type of RS is occupied in a time domain. 4 LTE system CRS orthogonal frequency division multiplexing OFDM symbol positions, wherein each of the OFDM symbols occupies 4 resource units; or the first type of RS occupies 4 non-LTE system CRS OFDM symbols in the time domain a location, wherein each of the OFDM symbols occupies 4 resource elements; or the first type of RS occupies 8 OFDM symbol locations in a time domain, wherein the 8 OFDM symbols comprise an LTE system CRS and a non-LTE system CRS OFDM symbols, each of which occupies 2 resource elements.

Optionally, the non-overlapping of the first type of RS pattern with the LTE system CRS pattern includes: when the subframe for transmitting the physical downlink channel data is a time division duplex TDD system special subframe, the first type of RS Occupying 1 or 2 LTE system CRS OFDM symbol locations in the time domain, wherein each of the OFDM symbols occupies 4 resource units; or the first type of

RS occupies

1 or 2 non-LTE systems in the time domain CRS OFDM symbol location, wherein each of the OFDM symbols occupies 4 resource elements; or the first type of RS occupies 4 non-LTE system CRS OFDM symbol locations in the time domain, wherein each of the OFDM symbols Occupying 2 or 4 resource units; or, the first type of RS occupies 4 OFDM symbol positions in the time domain, wherein 4 of the OFDM symbols include an LTE system CRS and a non-LTE system CRS OFDM symbol, each of which The OFDM symbol occupies 2 or 4 resource elements.

Optionally, when the OFDM symbols occupied by the first type of RS are all non-LTE system CRS OFDM symbols, the first type of RS pattern is fixed, or the first type of RS pattern is based on a physical cell identifier. PCID is determined.

Optionally, when the OFDM symbol occupied by the first type of RS includes: a non-LTE system CRS OFDM symbol and an LTE system CRS OFDM symbol, the non-LTE system CRS OFDM symbol number is the same as the LTE system CRS OFDM symbol number Wherein the first type of RS pattern on the non-LTE system CRS OFDM symbol is fixed, and the first type of RS pattern on the LTE system CRS OFDM symbol is determined according to a physical cell identifier PCID, or The first type of RS pattern on the non-LTE system CRS OFDM symbol and the first type of RS pattern on the LTE system CRS OFDM symbol are all determined according to the PCID, and in the non-LTE system CRS OFDM symbol The first type of RS pattern on the first type of RS pattern on the LTE system CRS OFDM symbol has a fixed offset L in the frequency domain, where L is an integer greater than or equal to zero.

Optionally, in the in-band operation and the non-in-band operation, when the same RS category is used to transmit the physical downlink channel data, the physical downlink channel data is transmitted according to different RS patterns; wherein the non-in-band The operation is to protect the belt operation, or to operate independently.

Optionally, when the physical downlink channel data is transmitted according to different RS patterns, the non-in-band operated RS pattern is a sub-pattern of the in-band operated RS pattern.

Optionally, the RS category for transmitting the physical downlink channel data is determined by at least one of the following: a manner of pre-defined configuration, a manner according to a coverage level and/or an aggregation level, and a manner of signaling indication.

Optionally, the method further includes: transmitting physical downlink channel data according to the second type RS of the K2 port, or transmitting physical downlink channel data according to the third type of RS, and the third class When the RS pattern is a superposition of the first type RS pattern of the K1 port and the second type RS pattern of the K2 port, the transmitting side maps the K1 port to the K2 port according to the precoding matrix of the K2×K1 dimension, and the receiving side Obtaining an equivalent channel coefficient of the K1 port according to the K2×K1 dimension precoding matrix and the estimated K2 port channel coefficient; wherein K1 and K2 are integers greater than 0 and K1 is less than K2.

Optionally, the interval initialized by the RS sequence generator includes: a Ninit subframe or a radio frame, where the Ninit is an integer greater than or equal to 1.

Optionally, determining an initialization value of the RS sequence generator according to at least one of the following: determining according to a physical cell identifier PCID; determining according to the PCID and a cyclic prefix CP type; and initializing an interval number and a location according to the RS sequence Determining the PCID determination; determining the interval number, the PCID, and the cyclic prefix CP type according to the RS sequence.

Optionally, the method further includes indicating, by using signaling, a sequence value and/or a port number of the second type RS or the third type RS by using an in-band operation.

Optionally, the method further comprises: pre-defining and/or transmitting the subframe of the RS by using a signaling configuration under non-in-band operation.

Optionally, in non-in-band operation, the subframe in which the synchronization signal SS is transmitted is not used to transmit the RS; or the OFDM symbol used to transmit the SS in the subframe in which the SS is transmitted is not used to transmit the RS.

Optionally, the RS sequence is a sub-sequence of length 2 in an LTE system CRS sequence of length 2N _RB ^{max, DL} , where N _RB ^{max, DL} represents a maximum downlink bandwidth configuration of the LTE system.

Optionally, the parameters m ₀ and m _{1 are} pre-defined or indicated by signaling; the RS sequence is obtained according to the parameters m ₀ and m ₁ and the following equation:

The r _{l, ns} (i) represents the RS sequence, the N _ID ^cell represents a physical cell identifier PCID, the n _s represents a slot index, and the l represents an OFDM symbol index, and the N _CP depends The cyclic prefix CP type takes a value of 0 or 1, and the c _init represents an initialization value of the pseudo-random sequence c(·).

Optionally, the parameters m ₀ and m ₁ are predefined to be 0 and 1 respectively; or, the parameters m ₀ and m ₁ are predefined to be N _RB ^{max, DL} -1 and N _RB ^{max, respectively. DL.}

Optionally, when the parameters of the parameters m ₀ and m _{1 are} indicated by signaling, the parameter values {m ₀ , m ₁ } belong to a predefined set.

Optionally, the RS is used to transmit the physical broadcast channel PBCH data, and/or, in the non-in-band operation, when the RS is used to transmit the physical downlink control channel PDCCH and the physical downlink shared channel PDSCH data, The predefined manner determines that the parameters m ₀ and m ₁ take values.

Optionally, the sequence of the RS for transmitting PBCH data is the same as the sequence of the RS for transmitting PDCCH and PDSCH data under non-in-band operation.

Optionally, in an in-band operation, when an LTE multicast broadcast single frequency network MBSFN subframe that does not transmit a multicast broadcast multimedia service MBMS service is used for NB-IOT physical downlink channel data transmission, the RS is in the The MBSFN area is transmitted on the MBSFN area of the MBSFN subframe. When an LTE MBSFN subframe that does not transmit the MBMS service is not used for the NB-IOT physical downlink channel data transmission, the RS is not transmitted on the MBSFN area of the MBSFN subframe.

According to another aspect of the embodiments of the present invention, a data transmission apparatus is provided, including: a transmission module, configured to transmit physical downlink channel data according to one of the following reference signals RS; wherein the RS includes: RS, the second type of RS, and the third type of RS.

According to still another embodiment of the present invention, a storage medium is also provided. The storage medium is arranged to store program code for performing the following steps:

The physical downlink channel data is transmitted according to the reference signal RS of one of the following; wherein the RS includes: a first type RS, a second type RS, and a third type RS.

According to the embodiment of the present invention, the data transmission performance and the reference signal overhead of different NB-IOT physical downlink channel data are ensured by using the first type reference signal RS or the second type RS or the third type RS to transmit physical downlink channel data. The balance between the two, in turn, solves the problem in the related art that the NB-IOT physical channel data is transmitted according to what reference signal.

DRAWINGS

The drawings described herein are provided to provide a further understanding of the invention, which form a part of this application, The illustrative embodiments and the description thereof are illustrative of the invention and are not to be construed as limiting the invention. In the drawing:

1 is a flow chart of a method of transmitting data according to an embodiment of the present invention;

2 is a block diagram showing the structure of a data transmission apparatus according to an embodiment of the present invention;

3 is a first schematic diagram of a first type of RS pattern for a normal subframe type, in accordance with an alternative embodiment of the present invention;

4 is a second schematic diagram of a first type of RS pattern for a normal subframe type, in accordance with an alternative embodiment of the present invention;

5 is a third schematic diagram of a first type of RS pattern for a normal subframe type, in accordance with an alternative embodiment of the present invention;

6 is a first schematic diagram of a first type of RS pattern for a TDD system special subframe type according to an alternative embodiment of the present invention;

7 is a second schematic diagram of a first type of RS pattern for a TDD system special subframe type according to an alternative embodiment of the present invention;

8 is a third schematic diagram of a first type of RS pattern for a TDD system special subframe type according to an alternative embodiment of the present invention;

9 is a fourth schematic diagram of a first type of RS pattern for a TDD system special subframe type according to an alternative embodiment of the present invention;

10 is a schematic diagram of a fixed offset of an RS pattern of a non-LTE system CRS OFDM symbol with respect to an RS pattern of an LTE system CRS OFDM symbol, in accordance with an alternative embodiment of the present invention;

11 is a schematic diagram of a first type of RS pattern for transmitting physical downlink channel data under In-band and non-In-band operation, in accordance with an alternative embodiment of the present invention;

12 is a schematic diagram of a second type of RS pattern for transmitting physical downlink channel data under In-band and non-In-band operation, in accordance with an alternative embodiment of the present invention;

13 is a diagram of a third type of RS pattern for transmitting physical downlink channel data under In-band and non-In-band operation, in accordance with an alternate embodiment of the present invention.

detailed description

The invention will be described in detail below with reference to the drawings in conjunction with the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict.

It is to be understood that the terms "first", "second" and the like in the specification and claims of the present invention are used to distinguish similar objects, and are not necessarily used to describe a particular order or order.

In this embodiment, a data transmission method is provided. FIG. 1 is a flowchart of a data transmission method according to an embodiment of the present invention. As shown in FIG. 1, the process includes the following steps:

Step S102: Acquire a category of a reference signal (Reference Signal, abbreviated as RS);

Step S104: The physical downlink channel data is transmitted according to the reference signal RS of one of the following; wherein the RS includes: a first type RS, a second type RS, and a third type RS.

With the embodiment, the physical downlink channel data is transmitted according to the first type RS or the second type RS or the third type RS, and the balance between the data transmission performance and the RS overhead of different NB-IOT physical downlink channel data is ensured. Further, the problem of not transmitting the NB-IOT physical channel data according to what kind of RS is known in the related art is solved.

It should be noted that the foregoing step S102 is an optional step of the present invention. In a specific application scenario, the step may be omitted or may be performed. In this step, the RS category for transmitting the physical downlink channel data may be determined by at least one of the following: a manner of pre-defined configuration, a manner according to a coverage level and/or an aggregation level, and a signaling indication manner.

In addition, the first type of RS pattern (RS Pattern) in this embodiment does not overlap with the Cell-specific Reference Signal (CRS) pattern of the LTE system, where the CRS pattern of the LTE system is 4 ports ( The LTE system CRS pattern of the LTE system CRS maximum port number; the second type RS pattern is the same as the LTE system CRS pattern, or the second type RS pattern is the sub-pattern of the LTE system CRS pattern, wherein the LTE system CRS pattern is 2-port The LTE system CRS pattern or the 4-port LTE system CRS pattern; the third type RS pattern is a superposition of the first type RS pattern and the second type RS pattern. It should be noted that the CRS pattern of the LTE system of the present invention is a CRS pattern of the current cell LTE system, that is, the CRS pattern of the LTE system is determined according to the current cell PCID.

The RS involved in this embodiment may be a 2-port or 4-port RS.

Taking the two ports as an example, when the first type of RS pattern is 2 ports, the first type of RS pattern does not overlap with the 4-port LTE system CRS pattern; when the second type of RS pattern is 2 ports, the second type of RS pattern and A 2-port (such as port 0 and port 1) LTE system CRS pattern is the same, or a 2 port (such as port 0 and port 1) LTE system CRS pattern sub-pattern; when the third type RS pattern is 2 ports The third type of RS pattern is a superposition of a 2-port first-class RS pattern and a 2-port second-class RS pattern.

Taking 4 ports as an example, when the first type of RS pattern is 4 ports, the first type of RS pattern does not overlap with the 4-port LTE system CRS pattern; when the second type of RS pattern is 4 ports, the second type of RS pattern and The CRS pattern of the 4-port LTE system is the same, or the sub-pattern of the CRS pattern of the 4-port LTE system; when the third-class RS pattern is 4 ports, the third-class RS pattern is the 4-port RS-type pattern and the 4-port version. The superposition of the second type of RS pattern.

The second type of RS is specified when the physical downlink channel data is transmitted according to the second type of RS, in the inband operation, in the optional implementation manner of this embodiment. 2-port LTE system CRS; wherein, when the 2-port LTE system CRS is configured, the designated 2 port is port 0 and port 1; when the 4-port LTE system CRS is configured, the designated 2 port is port 0 and port 1, or, port 0 and port 2, or port 1 and port 3. In addition, when the 4-port LTE system CRS is configured, the designated 2 ports mentioned above are fixed as port 0 and port 1; or the designated 2 port varies with the subframe; wherein, when the designated 2 port changes with the subframe, In some sub-frames, 2 ports are designated as port 0 and port 2, and in another part of the sub-frame, port 2 is designated as port 1 and port 3. For example, if 4 consecutive subframes are used for physical downlink channel data transmission, the 4 subframes may be fixedly using port 0 and port 1, or The first 2 subframes use port 0 and port 2, and the last 2 subframes use port 1 and port 3. Adopting a fixed setting to specify 2 ports is low in complexity, which is conducive to unified design in different operation modes; using a designated 2 port that varies with sub-frames is advantageous for obtaining spatial diversity gain. The physical downlink channel may be a PDCCH or a PDSCH channel. In the above manner, the CRS of the LTE system of the 2-port or 4-port is configured by the base station, and the CRS of the 2-port LTE system is uniformly used as the second type of RS. Reduced terminal device implementation complexity.

When the physical downlink channel data is transmitted according to the third type of RS, the third type of RS is a superposition of the second type RS of the 2-port and the first type RS of the 2-port; wherein the first port and the second type of the first type RS are The first port of the RS-like class is the same port, and the second port of the first type of RS is the same port as the second port of the second type of RS; that is, the physical antenna of the first port RS transmitting the first type of RS is always transmitted and transmitted second. The physical antenna of the first port RS of the RS-like class is the same, and the physical antenna of the second port RS transmitting the first type of RS is always the same as the physical antenna of the second port RS transmitting the second type of RS; in addition, under in-band operation, The second type of RS is a 2-port LTE system CRS; wherein, when the 2-port LTE system CRS is configured, the designated 2 port is port 0 and port 1; when the 4-port LTE system CRS is configured, the designation 2 Ports are port 0 and port 1, or port 0 and port 2, or port 1 and port 3. In addition, when the 4-port LTE system CRS is configured, the designated 2 ports mentioned above are fixed as port 0 and port 1; or the designated 2 port varies with the subframe; wherein, when the designated 2 port changes with the subframe, In some sub-frames, 2 ports are designated as port 0 and port 2, and in another part of the sub-frame, port 2 is designated as port 1 and port 3. For example, if 4 consecutive subframes are used for physical downlink channel data transmission, the 4 subframes may use port 0 and port 1 fixedly, or the first 2 subframes use port 0 and port 2, and the last 2 subframes use port 1 and Port 3. Adopting a fixed setting to specify 2 ports is low in complexity, which is conducive to unified design in different operation modes; using a designated 2 port that varies with sub-frames is advantageous for obtaining spatial diversity gain.

It should be noted that, unless otherwise specified, the RS or CRS pattern of the present invention refers to a pattern within a subframe in which an RS transmission exists; the so-called pattern only refers to the location of the resource unit occupied by the RS, and does not involve the The location of the resource unit is specifically occupied by which port of the RS.

The non-overlapping of the first type of RS pattern and the LTE system CRS pattern involved in this embodiment includes: When the subframe in which the physical downlink channel data is transmitted is a normal subframe, the first type of RS occupies 4 LTE system CRS orthogonal frequency division multiplexing OFDM symbol positions in the time domain, where each OFDM symbol occupies 4 Resource unit; or, the first type of RS occupies 4 non-LTE system CRS OFDM symbol positions in the time domain, where each OFDM symbol occupies 4 resource units; or, the first type of RS occupies 8 OFDM in the time domain A symbol position, wherein the 8 OFDM symbols include an LTE system CRS and a non-LTE system CRS OFDM symbol, each OFDM symbol occupying 2 resource units.

The first type of RS that is involved in this embodiment is a 2-port RS. In another optional implementation manner of this embodiment, the first type of RS pattern involved in this embodiment does not overlap with the CRS pattern of the LTE system. The method includes: when the subframe in which the physical downlink channel data is transmitted is a time-division duplex TDD system special subframe, the first type of RS occupies 1 or 2 LTE system CRS OFDM symbol positions in the time domain, where each OFDM symbol occupies 4 Resource unit; or, the first type of RS occupies 1 or 2 non-LTE system CRS OFDM symbol locations in the time domain, where each OFDM symbol occupies 4 resource units; or, the first type of RS occupies in the time domain 4 non-LTE system CRS OFDM symbol locations, where each OFDM symbol occupies 2 or 4 resource elements; or, the first type of RS occupies 4 OFDM symbols in the time domain Position, wherein the 4 OFDM symbols comprise an LTE system CRS and a non-LTE system CRS OFDM symbol, each OFDM symbol occupying 2 or 4 resource elements.

In addition, in this embodiment, when the OFDM symbols occupied by the first type of RS are all non-LTE system CRS OFDM symbols, the first type of RS pattern is fixed, or the first type of RS pattern is based on the physical cell identifier. (Physical Cell Identity, PCID for short) is determined.

When the OFDM symbols occupied by the first type of RS include a non-LTE system CRS OFDM symbol and an LTE system CRS OFDM symbol, the non-LTE system CRS OFDM symbol number is the same as the LTE system CRS OFDM symbol number; wherein, on the non-LTE system CRS OFDM symbol The first type of RS pattern is fixed, and the first type of RS pattern on the LTE system CRS OFDM symbol is determined according to the physical cell identity PCID, or the first type of RS pattern on the non-LTE system CRS OFDM symbol and the CRS in the LTE system The first type of RS pattern on the OFDM symbol is determined according to the PCID, and the first type of RS pattern on the non-LTE system CRS OFDM symbol has a fixed offset in the frequency domain relative to the first type RS pattern on the LTE system CRS OFDM symbol. Let L, where L is an integer greater than or equal to zero.

It should be noted that, in the in-band operation and the non-in-band operation, when the same RS category is used to transmit physical downlink channel data, physical downlink channel data is transmitted according to different RS patterns; wherein, the non-in-band operation is a guard band operation. , or operate independently. When the physical downlink channel data is transmitted according to different RS patterns, the RS pattern of the non-in-band operation may be a sub-pattern of the RS pattern of the in-band operation.

In this embodiment, when the physical downlink channel data is transmitted according to the second type RS of the K2 port, or the physical downlink channel data is transmitted according to the third type RS, and the third type RS pattern is the first type RS pattern of the K1 port and When the second type of RS pattern of the K2 port is superimposed, the transmitting side maps the K1 port to the K2 port according to the precoding matrix of the K2×K1 dimension, and the receiving side according to the K2×K1 dimension precoding matrix and the estimated K2 port channel. The coefficient obtains the equivalent channel coefficient of the K1 port; wherein K1 and K2 are integers greater than 0 and K1 is less than K2. By using the method, when transmitting physical downlink channel data according to the second type RS or the third type RS, the terminal device has the capability to implement physical downlink channel data reception of the K1 port by using the second type RS of the K2 port (for example, 4 ports).

In addition, the sequence initialized by the sequence generator involved in the RS in this embodiment includes: N _init subframes or radio frames, where N _init is an integer greater than or equal to 1. In an optional implementation manner of this embodiment, determining an initialization value of the RS sequence generator according to at least one of the following: determining according to the physical cell identifier PCID; determining according to the PCID and the cyclic prefix CP type; and initializing the interval number and the PCID according to the RS sequence Determine; determine according to the RS sequence initialization interval number, PCID, and cyclic prefix CP type.

In addition, in the optional implementation manner of this embodiment, the method in this embodiment may further include: indicating, by using signaling, the sequence value of the second type RS or the third type RS in the embodiment. And / or the number of ports.

In addition, the method in this embodiment may further include: pre-defining and/or transmitting the subframe of the RS in the embodiment in a non-in-band operation; the subframe in which the synchronization signal SS is transmitted is not used to transmit the RS or Only the OFDM symbols used to transmit the SS in the subframe in which the SS is transmitted are not used to transmit the RS.

In addition, the RS sequence involved in this embodiment may be a sub-sequence of length 2 in the LTE system CRS sequence of length 2N _RB ^{max, DL} , where N _RB ^{max, DL} represents the maximum downlink bandwidth configuration of the LTE system (for example, 110 PRBs). By intercepting a segment of the existing LTE CRS sequence as an RS sequence, on the one hand, there is no loss of large transmission performance, and on the other hand, it avoids completely redesigning a new RS sequence, thereby reducing the standardization workload of the RS sequence. Specifically, in this embodiment, the RS sequence may be obtained according to the following operations: pre-defining or indicating the values of the parameters m ₀ and m ₁ by signaling (for example, by PBCH signaling); then, according to the parameters m ₀ and m ₁ and the following, etc. Get the RS sequence:

Where r _{l, ns} (i) is the RS sequence, N _ID ^cell is the physical cell identifier PCID, n _s is the slot index, l is the OFDM symbol index, and N _CP depends on the cyclic prefix CP type, and the value is 0 or 1, c _init is the initialization value of the pseudo-random sequence c(·).

Incidentally, when it is determined that the parameter values m ₀ and m ₁ are employed in a predefined manner, the parameter values m ₀ and m ₁ are 1 and 0, respectively; alternatively, the parameter values m ₀ and m ₁ are respectively N _RB ^{max , DL} -1 and N _RB ^{max, DL} . And, when the values of the parameters m ₀ and m _{1 are} indicated by signaling, the parameter values {m ₀ , m ₁ } belong to a predefined set; wherein, the in-band operation, the guard band operation, and the independent operation are all through the letter. When instructing to obtain the values of m ₀ and m ₁ , the in-band operation, the guard band operation, and the independent operation all use the same predefined set or respectively use different predefined sets. For example, for in-band operation, in order to achieve flexible deployment of the NB-IOT system in other frequency bands than the 6 PRBs of the LTE system bandwidth center, the set of predefined values {m ₀ , m ₁ } may be { 0,1},{2,3},{4,5},...,{N _RB ^max,DL -8,N _RB ^max,DL -7},{N _RB ^max,DL +6,N _RB ^{max , DL} +7}, {N _RB ^{max, DL} +8, N _RB ^{max, DL} +9}, ..., {2N _RB ^{max, DL} -2, 2N _RB ^{max, DL} -1}; for guard band operation and Independent operation, to simplify the design, can follow the same predefined set of in-band operations; but from the perspective of saving control overhead, the predefined set can be a subset of the predefined set of in-band operations; based on this, as a The guard band operation of a subset of the predefined set of inner operations and the predefined set of independent operations may be the same or different, for example for independent operations, the predefined set may be {0, 1}, {2, 3}, { 4,5},...,{14,15}, for guard band operations, predefined sets can follow a predefined set of independent operations, or define a new predefined set.

In addition, in another optional implementation manner of this embodiment, the RS is used to transmit the physical broadcast channel PBCH data, and/or is used to transmit the physical downlink control channel PDCCH and the physical downlink shared channel PDSCH data in the RS under non-inband operation. The values of the parameters m ₀ and m ₁ are determined in a predefined manner. When decoding the PBCH, the terminal device may not know the operation mode of the NB-IOT system. In this case, it is preferable to transmit the PBCH data by using a predefined first type of RS sequence (equivalent to the predefined values of m ₀ and m ₁ ). In non-in-band operation, there is no need for a backward compatible LTE system for PDCCH and PDSCH transmission, and a predefined second or third type of RS sequence (equivalent to a predefined m _{0 ) is} used from a simplified design perspective. It is preferable to transmit PDCCH and PDSCH data with m ₁ value.

The sequence of the RS for transmitting PBCH data involved in the above embodiment is the same as the sequence of the RS for transmitting PDCCH and PDSCH data under non-in-band operation. When the sequence of the RS for transmitting the PBCH data and the sequence of the RS for transmitting the PDCCH and the PDSCH data are both acquired in a predetermined manner, the above two sequences may be set to be the same for the unified design. sequence, this time, for determining {m _0, m _1} the value used to determine PDCCH and PDSCH RS sequences in the non-operating with {m _0, m _1} PBCH RS sequence identical values.

In the in-band operation, in a LTE Multicast and Broadcast Single Frequency Network (MBSFN) subframe that does not transmit the Mulcastcast and Broadcast Multimedia Service (MBMS) service. When the NB-IOT physical downlink channel data transmission is performed, the RS is transmitted on the MBSFN area of the MBSFN subframe; when an LTE MBSFN subframe that does not transmit the MBMS service is not used for the NB-IOT physical downlink channel data transmission, the RS is not in the MBSFN. The subframe is sent on the MBSFN area. In the in-band operation, if one subframe is configured by the network as an MBSFN subframe of the LTE system, but the subframe is not actually used for transmitting the MBMS service of the LTE system, the MBSFN subframe may be used to improve resource utilization efficiency. The NB-IOT available subframe resources are used to transmit NB-IOT physical downlink channel (eg, PDCCH or PDSCH) data. When the MBSFN subframe is used for NB-IOT physical downlink channel data transmission, an RS (a first type of RS or a second type of RS or a third type of RS) for demodulating the physical downlink channel data is accompanied by physical channel data. Together, it is sent in the MBSFN area of the MBSFN subframe; otherwise, when the MBSFN subframe is not used for NB-IOT physical downlink channel data transmission, in order to avoid data transmission affecting the LTE system UE as much as possible, the corresponding NB-IOT The RS (the first type of RS or the second type of RS or the third type of RS) is not transmitted in the MBSFN area of the MBSFN subframe. The MBSFN area of one MBSFN subframe includes other OFDM symbols except the previous two OFDM symbols in the MBSFN subframe. It should be noted that the MBSFN area of one MBSFN subframe is a concept in the time domain. In the frequency domain, the NB-IOT RS is only transmitted in the NB-IOT narrowband (1 PRB) range, instead of the LTE system bandwidth. Send within.

Through the description of the above embodiments, those skilled in the art can clearly understand that the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, by hardware, but in many cases, the former is A better implementation. Based on such understanding, the technical solution of the present invention, which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a storage medium (such as ROM/RAM, disk, The optical disc includes a number of instructions for causing a terminal device (which may be a cell phone, a computer, a server, or a network device, etc.) to perform the methods of various embodiments of the present invention.

In the embodiment, a data transmission device is also provided, which is used to implement the above-mentioned embodiments and preferred embodiments, and has not been described again. As used below, the term "module" may implement a combination of software and/or hardware of a predetermined function. Although the apparatus described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware, is also possible and contemplated.

2 is a structural block diagram of a data transmission apparatus according to an embodiment of the present invention. As shown in FIG. 2, the method includes:

The obtaining module 22 is configured to acquire a category of the reference signal RS;

The transmission module 24 is coupled to the acquisition module 22 and configured to transmit physical downlink channel data according to one of the following RSs. The RS includes: a first type RS, a second type RS, and a third type RS.

It should be noted that each of the above modules may be implemented by software or hardware. For the latter, the foregoing may be implemented by, but not limited to, the foregoing modules are all located in the same processor; or are respectively located in multiple processors. .

The invention is exemplified below in conjunction with an alternative embodiment of the invention;

The optional embodiment provides a data transmission method, and the method includes the following steps: Transmit physical downlink channel data: the first type RS, the second type RS, and the third type RS.

The physical downlink channel includes but is not limited to:

The physical broadcast channel PBCH, the physical downlink control channel PDCCH, and the physical downlink shared channel PDSCH.

In the optional embodiment, at least for the non-In-band operation, the interval initialized by the RS sequence generator includes N _init subframes or radio frames, where N _init is an integer greater than or equal to 1.

In the related art, the LTE system CRS sequence generator is initialized per OFDM symbol. For the NB-IOT system, if the sequence initialization interval of one OFDM symbol is still used, considering that under the limitation of one PRB bandwidth, the NB-IOT RS occupies a small number of resource units per OFDM symbol, which causes each time The sequence values generated after the sequence initialization operation are very small, which is very inefficient. In order to improve the efficiency of sequence generation, for the NB-IOT system, it may be considered to perform initialization of the NB-IOT RS sequence at intervals of one or more subframes or radio frames.

The initialization value of the RS sequence generator may be determined according to one of the following methods: determined according to the PCID, or determined according to the PCID and the cyclic prefix CP type, or determined according to the RS sequence initialization interval number and the PCID, or the initialization interval according to the RS sequence. The number, PCID and CP type are determined.

In addition, the first type of RS pattern in the alternative embodiment does not overlap with the 4-port LTE system CRS pattern, that is, the resource unit occupied by the first type of RS does not overlap with the resource unit of the 4-port LTE system CRS or 4 ports. The LTE system CRS resource unit is no longer used to transmit the first type of RS; the second type RS pattern is the same as the 2-port or 4-port LTE system CRS pattern, or the 2-port or 4-port LTE system CRS pattern The resource unit of the second type of RS is the same as the resource unit of the CRS of the 2-port or 4-port LTE system, or the resource unit of the second type of RS is the 2-port or 4-port resource unit of the CRS of the LTE system. The third type of RS pattern is a superposition of the first type of RS pattern and the second type of RS pattern, that is, the resource unit of the third type of RS includes the resources of the first type of RS and the resources of the second type of RS. unit. For in-band operation, when the second or third type of RS is used to transmit physical downlink channel data, since the second type of RS is equivalent to the LTE system CRS, the RS and the data may have the same or different power levels.

For any one of the physical downlink channels, at least one of the three RS types may be supported; for example, for the PBCH channel, only the first type of RS may be supported from a simplified design perspective; for the PDCCH or PDSCH channel, the RS overhead is ensured For the balance between data transmission performance, the second type of RS and the third type of RS can be supported.

Taking the 2-port first-class RS pattern as an example, the RS does not overlap with the CRS pattern of the LTE system, including:

1) When the subframe in which the physical downlink channel data is transmitted is a normal Normal subframe, the overlap between the RS and the LTE system CRS pattern in the present optional embodiment may be: occupying 4 LTE systems CRS OFDM in the RS time domain. The symbol position, each OFDM symbol occupies 4 resource units; by setting the RS pattern to have a fixed offset relative to the LTE system CRS pattern, for example, the offset is fixed to 1, which is advantageous for directly reusing the relevant LTE system CRS design. Or, occupying 4 non-LTE system CRS OFDM symbol positions, each OFDM symbol occupies 4 resource units; by adopting a fixed RS pattern, the method is advantageous for minimizing design complexity. Or occupying 8 OFDM symbols, including LTE system CRS and non-LTE system CRS OFDM symbols, each OFDM symbol occupies 2 resource units; the method is beneficial to maximize by further spreading in the time domain RS power boosting effect. In addition, all the above methods are the same It is ensured that when the RS is a 2-port, the number of resource units occupied does not exceed the number of resource units occupied by the CRS of the 2-port LTE system, that is, the overhead of maintaining 16 resource units, and each port corresponds to 8 resource units.

2) When the subframe in which the physical downlink channel data is transmitted is the special subframe type of the time division duplex TDD system, the RS and the LTE system CRS pattern do not overlap in the alternative embodiment: 1 or 2 LTE systems are occupied in the RS time domain. CRS OFDM symbol position, each OFDM symbol occupies 4 resource elements; or occupies 1 or 2 non-LTE system CRS OFDM symbol positions, each OFDM symbol occupies 4 resource units; or, occupies 4 non-LTE system CRS OFDM Symbol position, each OFDM symbol occupies 2 or 4 resource elements; or, occupies 4 OFDM symbol positions, including LTE system CRS and non-LTE system CRS OFDM symbols, each OFDM symbol occupies 2 or 4 resource units. The number of OFDM symbols included in the Downlink Pilot Time Slot (DwPTS) is different when the special subframe configuration of the TDD system is used. The corresponding RS pattern should depend on the number of OFDM symbols occupied by the DwPTS. . Generally, the smaller the number of OFDM symbols occupied by the DwPTS, the smaller the number of resource units (overhead) occupied by the corresponding RS pattern; all the above methods take into account the configuration of different special subframes.

In addition, when all the OFDM symbols occupied by the RS are non-LTE system CRS OFDM symbols, the RS pattern in the alternative embodiment may be fixed or determined according to the physical cell identifier PCID. The fixed RS pattern can minimize the design complexity; determining the RS pattern according to the PCID is beneficial to reuse the existing LTE system CRS design and reduce the inter-cell RS interference. For example, the RS pattern is determined according to the PCID and the following equation: Ipattern = mod (PCID, N), N represents the number of candidate RS patterns, and Ipattern represents an index of the RS pattern whose value range is 0 to N-1. In this case, if it is assumed that there are fixed offsets for different candidate RS patterns, for example, the offset of the adjacent RS pattern is +1, the RS pattern of the two cells using different PCIDs has a fixed offset, which depends on two The PCID value.

In another embodiment of the present optional embodiment, when the RS occupied OFDM symbol includes a non-LTE system CRS and an LTE system CRS OFDM symbol, the number of CRS OFDM symbols of the non-LTE system is the same as the number of CRS OFDM symbols of the LTE system, where The RS pattern on the CRS OFDM symbol of the non-LTE system is fixed, and the RS pattern on the CRS OFDM symbol of the LTE system is determined according to the PCID; in this way, it is advantageous to ensure a regular or uniform RS pattern. Alternatively, the RS pattern on the non-LTE system CRS OFDM symbol and the RS pattern on the LTE system CRS OFDM symbol are all determined according to the PCID, and the RS pattern on the non-LTE system CRS OFDM symbol is relative to the RS pattern on the LTE system CRS OFDM symbol There is a fixed offset L in the frequency domain, where L is an integer greater than or equal to 0; by this method: it is advantageous to reuse the existing LTE system CRS design principles and reduce inter-cell RS interference.

For the optional embodiment, in the in-band In-band and non-In-band operation, when the same RS category is used to transmit physical downlink channel data, the physical downlink channel data is transmitted according to different RS patterns; The -band operation is for protection with Guard band operation, or independent Stand alone operation. The same RS category is the first type RS, the second type RS, or the third type RS; specifically, for the first type RS, different RS patterns are different first type RS patterns, and for the second type RS, Different RS patterns are different second type RS patterns, and for the third type RS, different RS patterns are different third type RS patterns. When the physical downlink channel data is transmitted according to different RS patterns: the RS pattern of the non-In-band operation is a sub-pattern of the RS pattern of the In-band operation, that is, the resource pattern of the non-In-band operation RS pattern is In-band The RS pattern of the operation occupies a subset of the resource unit; for the first type of RS, the non-In-band operation of the first type of RS pattern is a sub-pattern of the first type of RS pattern of the In-band operation, and for the second type of RS, the non-In -band operation of the second type of RS pattern is The In-band operates a sub-pattern of the second type of RS pattern, and, for the third type of RS, the third type of RS pattern that is not In-band operated is a sub-pattern of the In-band operation of the third type of RS pattern.

In another embodiment of the present optional embodiment, the transport physical downlink channel data RS class may be determined by one of the following methods: predefined, or determined according to the coverage level and/or aggregation level, or indicated by signaling. For example, PBCH data can always be transmitted according to the first type of RS. It is contemplated that the second type of RS or the third type of RS is used for PDCCH or PDSCH data transmission. For the PDCCH channel, whether to transmit PDCCH data according to the second type of RS or the third type of RS may be determined according to the coverage level and/or the aggregation level. For the PDSCH channel, The PDSCH data may be transmitted according to the second type RS or the third type RS according to the coverage level. Considering that in the extreme coverage scenario, using the second type of RS (relative to the third type of RS density is low) does not provide accurate channel estimation, usually in a higher coverage level and/or aggregation level scenario, the third type of RS can be Use, otherwise the second type of RS is used.

While the physical downlink channel data is transmitted according to the third type RS, and the third type RS pattern is a superposition of the first type RS pattern of the K1 port and the second type RS pattern of the K2 port, where K1 and K2 are integers greater than 0 and K1 Less than K2, the transmitting side maps the K1 port to the K2 port according to the precoding matrix of the K2×K1 dimension, and the receiving side acquires the equivalent channel of the K1 port according to the precoding matrix of the K2×K1 dimension and the channel coefficient of the estimated K2 port. coefficient. For example, when the third type of RS pattern is a superposition of the 2-port first-class RS pattern and the 4-port second-class RS pattern, the transmitting side maps the 2 port to the 4-port according to the 4×2 dimension precoding matrix, and the receiving side The equivalent channel coefficients of the 2-port are obtained according to the 4×2 dimension precoding matrix and the estimated 4-port channel coefficients.

In still another embodiment, the sequence value and/or the number of ports of the second type RS or the third type RS are indicated by signaling under In-band operation. Under the In-band operation, when the second type RS or the third type RS is used for physical downlink channel data transmission, it is actually equivalent to the in-band existing LTE system CRS is reused as the NB-IOT RS; due to the LTE system CRS The value depends on the frequency position or PRB index of the CRS. To implement channel estimation, information about the value of the RS sequence (such as PRB index information) needs to be notified. In addition, when the NB-IOT system reuses the number of CRS ports of the LTE system, it may be necessary to notify the number of RS ports.

And sub-frames that transmit RSs are predefined and/or configured by signaling under non-In-band operation.

For example, for Standalone operation, considering that the base station transmit power spectral density far exceeds the In-band operation, in this case, even if the RS is not transmitted in all subframes, accurate channel estimation can be achieved, so to raise the peak Data rate, only a part of the subframe may be used to transmit the RS; the location (including the period and/or the offset) of the specific RS subframe may be implemented by pre-definition and/or by signaling configuration; for example, It is defined that the subframe in which the PBCH data is transmitted always has an RS transmission, and whether the subframe other than the PBCH subframe has an RS-dependent broadcast PBCH signaling configuration. In addition, to avoid the influence on the synchronization signal (Synchronization Signal, SS for short) transmission and simplify the design, the subframe in which the synchronization signal SS is transmitted may not be used to transmit the RS or only the OFDM symbol used to transmit the SS in the subframe in which the SS is transmitted. Not used to transmit RS (for example, through pre-defined or signaling configuration).

It can be seen that, in the optional embodiment, data transmission performance of different NB-IOT physical downlink channel data is ensured by transmitting physical downlink channel data according to the first type reference signal RS or the second type RS or the third type RS. Balance with the reference signal overhead.

The present optional embodiment will be described in detail below with reference to the accompanying drawings and specific embodiments;

Embodiment 1

3 is a first schematic diagram of a first type of RS pattern for a normal subframe type according to an alternative embodiment of the present invention. As shown in FIG. 3, for a normal CP and an extended CP, the RS occupies 4 LTE system CRSs in the time domain. OFDM symbol position, each OFDM symbol occupies 4 resource elements. Under the In-band operation, the first three OFDM symbols of the subframe may be used for the downlink control channel PDCCH transmission in the LTE system, and the RS does not occupy the above three OFDM symbols in the time domain, specifically, occupying the above three OFDMs in the time domain. 4 LTE system CRS OFDM symbol positions remaining outside the symbol; in addition, for each LTE system CRS OFDM symbol occupied by the RS in the time domain, the resource elements occupied in the frequency domain are the same, and the resource unit positions occupied by the CRS of the LTE system The offset is fixed at +1 (counting from the top sideband).

4 is a second schematic diagram of a first type of RS pattern for a normal subframe type, where the RS occupies 4 non-LTE system CRS OFDM symbol positions in the time domain, each OFDM symbol occupies 4, in accordance with an alternative embodiment of the present invention. Resource units. Under the In-band operation, the first three OFDM symbols of the subframe may be used for the downlink control channel PDCCH transmission in the LTE system, and the RS does not occupy the above three OFDM symbols in the time domain, specifically, occupying the above three OFDMs in the time domain. 4 non-LTE system CRS OFDM symbol locations other than symbols. In addition, for each non-LTE system CRS OFDM symbol occupied by the RS in the time domain, the resource unit positions occupied by the RS in the frequency domain are the same; for example, the normal CP type is taken as an example, as shown in FIG. 4 (a) It is shown that the number of OFDM symbols occupied by the RS is 3, 6, 9, and 12, and the number of resource units occupied in the frequency domain is 0, 3, 6, and 9 (counting from the upper sideband); as shown in FIG. 4 ( b) As indicated by the normal CP, the number of OFDM symbols occupied by the RS is 3, 6, 9, and 12. The number of resource elements occupied in the frequency domain is 0, 3, 8, and 11; (c) in Figure 4 As shown in the normal CP, the number of OFDM symbols occupied by the RS is 3, 6, 9, and 13. The number of resource elements occupied in the frequency domain is 0, 3, 6, and 9; (d) normal CP in Figure 4 As shown, the RSs occupy OFDM symbols numbered 3, 6, 9, and 13, and the resource elements occupied in the frequency domain are numbered 0, 3, 8, and 11.

Among them, the pattern shown in (a) normal CP in FIG. 4 ensures uniform distribution of the RS time-frequency dimension; (b) the pattern shown in the normal CP in FIG. 4, although only ensuring the uniform distribution of the RS time domain dimension, The reserved RS is located on both sides of the narrowband or PRB, which improves the channel estimation performance based on linear interpolation in the frequency domain; (c) the pattern shown by the normal CP in Fig. 4 only ensures the uniform distribution of the RS frequency domain dimension, but retains the RS by retaining the RS Located on both sides of the available OFDM symbol region, the channel estimation performance based on linear interpolation in the time domain is improved; (d) the pattern shown in the normal CP in FIG. 4 is that both the RS is located on both sides of the available OFDM symbol region and the RS is located in the narrow band. Or on both sides of the PRB, the channel estimation performance based on linear interpolation in the time-frequency domain is improved at the same time.

It should be noted that the case of (e) to (h) of the extended CP in FIG. 4 is similar to the case of the normal CPs (a) to (d) in FIG. 4 described above, and details are not described herein again.

FIG. 5 is a third schematic diagram of a first type of RS pattern for a normal subframe type according to an alternative embodiment of the present invention. As shown in FIG. 5, the RS occupies 8 OFDM symbol positions in the time domain, and 8 OFDM symbols include LTE system CRS and non-LTE system CRS OFDM symbols, each OFDM symbol occupies 2 resource units. In the in-band operation, the first three OFDM symbols may be used for the downlink control channel PDCCH transmission in the LTE system, and the RS does not occupy the above three OFDM symbols in the time domain, specifically, occupying the third OFDM symbols in the time domain. 4 non-LTE systems CRS OFDM The symbol and the 4 LTE system CRS OFDM symbol positions; in addition, for each OFDM symbol occupied by the RS in the time domain, the resource unit positions occupied in the frequency domain are different. For example, the normal CP type is taken as an example. As shown in (a) the normal CP in FIG. 5, the non-LTE system CRS OFDM symbols are numbered 3, 6, 9, and 12, and the LTE system CRS OFDM symbol number is 4. 7, 8, and 11, for OFDM symbols 3 and 12, the resource elements occupied by the RS in the frequency domain are numbered 0 and 6 (counting from the upper sideband), and for OFDM symbols 6 and 9, the resource elements occupied by the RS No. 3 and 9, for OFDM symbols 4 and 11, the resource unit position occupied by the RS is -1 relative to the position of the LTE system CRS in the two resource units (numbered 3 and 9) occupied by the two OFDM symbols. For OFDM symbols 7 and 8, the resource unit position occupied by the RS is +1 relative to the position of the LTE system CRS at the two resource units (numbered 3 and 9) occupied by the above two OFDM symbols; (b) The number of CRS OFDM symbols of the non-LTE system occupied by the RS is 3, 6, 9, and 12, and the CRS OFDM symbol numbers of the LTE system are 4, 7, 8, and 11, for the OFDM symbol 3. 6, 9 and 12, the resource elements occupied by the RS are numbered 0 and 11, and for the OFDM symbols 4, 7, 8, and 11, the resource unit positions occupied by the RS are relative to the LTE system CRS at the above OFDM The offset of the position of the two resource units (numbered 3 and 6) of the symbol is +1.

Wherein, compared with the (b) normal CP in FIG. 5, the pattern shown in (a) the normal CP in FIG. 5 occupies more resource units in the frequency domain, which is advantageous for improving the frequency domain based on linear interpolation. Channel estimation performance; in addition, compared to (a) normal CP (b) normal CP pattern complexity is relatively low, which is easy to implement.

It should be noted that the case of (c) to (d) of the extended CP in FIG. 5 is similar to the case of the normal CPs (a) to (b) in FIG. 5 described above, and details are not described herein again.

Embodiment 2

6 is a first schematic diagram of a first type of RS pattern for a TDD system special subframe type, in front of a Downlink Pilot Time Slot (DwPTS) under In-band operation, in accordance with an alternative embodiment of the present invention. The two OFDM symbols may be used for the downlink control channel PDCCH transmission in the LTE system, and the RS does not occupy the above two OFDM symbols in the time domain, and specifically occupies the CRS OFDM symbol position of the LTE system except the above two OFDM symbols in the time domain. For example, as shown in (a) normal CP in FIG. 6, it is assumed that the TDD special subframe configuration ratio is 9:4:1, that is, 9 OFDM symbols are used as DwPTS, and 4 OFDM symbols are used as uplink and downlink guard intervals (GP, Guard Period), one OFDM symbol is used as an Uplink Pilot Time Slot (UpP Pilot Time Slot). The RS occupies two LTE system CRS OFDM symbol positions in the time domain, and each OFDM symbol occupies 4 resource units. The OFDM symbol number is 4 and 7. For each of the LTE system CRS OFDM symbols, the RS has the same resource unit position in the frequency domain, and the offset of the LTE system CRS in the resource unit position occupied by the OFDM symbol is + 1 (counting from the upper sideband); as shown in (b) normal CP in Figure 6, it is assumed that the TDD special subframe configuration ratio is 7:6:1, that is, 7 OFDM symbols are used as DwPTS, and 6 OFDM symbols are used as upper and lower GP, 1 OFDM symbol as the UpPTS, the RS occupies 1 LTE system CRS OFDM symbol position in the time domain, specifically occupies 4 OFDM symbol numbers, and occupies 4 resource elements in the OFDM symbol, relative to the LTE system CRS The offset of the resource unit position occupied by the above OFDM symbol is +1 (from above With a counting).

7 is a second schematic diagram of a first type of RS pattern for a TDD system special subframe type, in which two OFDM symbols located in front of the DwPTS may be used in an LTE system, according to an alternative embodiment of the present invention. In the PDCCH transmission, the RS does not occupy the above two OFDM symbols in the time domain, and specifically occupies the non-LTE system CRS OFDM symbol positions except the above two OFDM symbols.

As shown in (a) normal CP in FIG. 7, it is assumed that the TDD special subframe configuration ratio is 9:4:1, that is, 9 OFDM symbols are used as DwPTS, 4 OFDM symbols are used as uplink and downlink GPs, and 1 OFDM symbol is used as UpPTS, the RS occupies 2 non-LTE system CRS OFDM symbol positions in the time domain, each OFDM symbol occupies 4 resource units, and the specific OFDM symbols are numbered 3 and 6, for each of the above non-LTE system CRS OFDM symbols The resource units occupied by the RS have the same location, and the specific occupied resource units are numbered 0, 3, 6, and 9 (counting from the upper sideband).

As shown in (b) normal CP in FIG. 7, it is assumed that the TDD special subframe configuration ratio is 9:4:1, that is, 9 OFDM symbols are used as DwPTS, 4 OFDM symbols are used as uplink and downlink GPs, and 1 OFDM symbol is used as UpPTS, the RS occupies 2 non-LTE system CRS OFDM symbol positions in the time domain, each OFDM symbol occupies 4 resource units, and the specific OFDM symbols are numbered 3 and 6, for each of the above non-LTE system CRS OFDM symbols The resource units occupied by the RS have the same location, and the specific occupied resource units are numbered 0, 3, 8, and 11 (counting from the upper sideband).

The pattern shown in (a) of the normal CP in FIG. 7 ensures uniform distribution of the frequency domain of the RS, thereby facilitating the simplification of the implementation; (b) the pattern shown by the normal CP in FIG. 7 is located in the narrowband or the PRB by the reserved RS. On both sides, the channel estimation performance based on linear interpolation in the frequency domain is further improved.

As shown in (c) normal CP in FIG. 7, it is assumed that the TDD special subframe configuration ratio is 7:6:1, that is, 7 OFDM symbols are used as DwPTS, 6 OFDM symbols are used as uplink and downlink GPs, and 1 OFDM symbol is used as UpPTS, the RS occupies 2 non-LTE system CRS OFDM symbol positions in the time domain, each OFDM symbol occupies 4 resource units, and the specific OFDM symbols are numbered 3 and 5, for each of the above non-LTE system CRS OFDM symbols The resource unit occupied by the RS has the same location, and the specific resource unit numbers are 0, 3, 6, and 9.

As shown in (d) normal CP in FIG. 7, it is assumed that the TDD special subframe configuration ratio is 7:6:1, that is, 7 OFDM symbols are used as DwPTS, 6 OFDM symbols are used as uplink and downlink GPs, and 1 OFDM symbol is used as UpPTS, the RS occupies 2 non-LTE system CRS OFDM symbol positions in the time domain, each OFDM symbol occupies 4 resource units, and the specific OFDM symbols are numbered 3 and 5, for each of the above non-LTE system CRS OFDM symbols The resource units occupied by the RS have the same location, and the specific occupied resource units are numbered 0, 3, 8, and 11.

FIG. 8 is a third schematic diagram of a first type of RS pattern for a TDD system special subframe type according to an optional embodiment of the present invention. Under In-band operation, 2 OFDM symbols located in front of the DwPTS may be used for LTE system PDCCH transmission. The RS does not occupy the above two OFDM symbols in the time domain, and specifically occupies the non-LTE system CRS OFDM symbol positions except the above two OFDM symbols.

As shown in a normal CP in FIG. 8, it is assumed that the TDD special subframe configuration ratio is 9:4:1, that is, 9 OFDM symbols are used as DwPTS, 4 OFDM symbols are used as uplink and downlink GPs, and 1 OFDM symbol is used as UpPTS. The RS occupies 4 non-LTE system CRS OFDM symbol positions in the time domain, and each OFDM symbol occupies 2 resource units, and the specific OFDM symbols are numbered 2, 3, 5, and 6, for each of the above non-LTE system CRSs. OFDM symbol, RS account The resource unit locations used are different. For

OFDM symbols

2 and 3, the resource elements occupied in the frequency domain are numbered 0 and 6, and for OFDM symbols 5 and 6, the resource elements occupied in the frequency domain are numbered 3 and 9. (counting from the upper sideband); as shown in (b) normal CP in Figure 8, it is assumed that the TDD special subframe configuration ratio is 9:4:1, that is, 9 OFDM symbols are used as DwPTS, and 4 OFDM symbols are used as uplink and downlink. GP, and 1 OFDM symbol as the UpPTS, the RS occupies 4 non-LTE system CRS OFDM symbol positions in the time domain, each OFDM symbol occupies 2 resource units, and the specific OFDM symbols are numbered 2, 3, 5 and 6. For each of the non-LTE system CRS OFDM symbols, the RS occupied resource unit locations are different. For

OFDM symbols

2 and 3, the resource elements occupied in the frequency domain are numbered 0 and 8, and for OFDM symbols 5 and 6, The resource units occupied in the frequency domain are numbered 3 and 11 (counting from the upper sideband); as shown in (c) normal CP in FIG. 8 and (d) normal CP in FIG. 8, TDD special subframe configuration is assumed. The ratio is 7:6:1, that is, 7 OFDM symbols are used as DwPTS, 6 OFDM symbols are used as uplink and downlink GP, and 1 OFDM symbol is used as U. The pPTS and RS patterns are similar to (a) normal CP in FIG. 8 and (b) normal CP in FIG. 8, and are not described herein again. The pattern shown in (a) of the normal CP in FIG. 8 ensures uniform distribution of the frequency domain of the RS, thereby facilitating the simplification of the implementation; (b) the pattern shown by the normal CP in FIG. 8 is located in the narrowband or the PRB by the reserved RS. On both sides, the channel estimation performance based on linear interpolation in the frequency domain is further improved.

9 is a fourth schematic diagram of a first type of RS pattern for a TDD system special subframe type according to an optional embodiment of the present invention. Under In-band operation, 2 OFDM symbols located in front of the DwPTS may be used for LTE system PDCCH transmission. The RS does not occupy the above two OFDM symbols in the time domain, and specifically occupies the non-LTE system CRS OFDM symbol positions except the above two OFDM symbols.

As shown in (a) normal CP in FIG. 9, it is assumed that the TDD special subframe configuration ratio is 9:4:1, that is, 9 OFDM symbols are used as DwPTS, 4 OFDM symbols are used as uplink and downlink GPs, and 1 OFDM symbol is used as UpPTS, the RS occupies 4 non-LTE system CRS OFDM symbol positions in the time domain, each OFDM symbol occupies 4 resource units, and the specific OFDM symbols are numbered 2, 3, 5, and 6, for each of the above non-LTE System CRS OFDM symbol, the resource unit occupied by the RS has the same location, and the specific occupied resource units are numbered 0, 3, 6, and 9 (counted from the upper sideband); as shown in (b) of Figure 9, the TDD special is assumed. The subframe configuration ratio is 9:4:1, that is, 9 OFDM symbols are used as DwPTS, 4 OFDM symbols are used as uplink and downlink GPs, and 1 OFDM symbol is used as UpPTS, and RS occupies 4 non-LTE system CRS OFDM symbols in the time domain. Position, each OFDM symbol occupies 4 resource units, and the specific OFDM symbols are numbered 2, 3, 5, and 6. For each of the non-LTE system CRS OFDM symbols, the resource unit positions occupied by the RS are the same, specifically occupied. Resource units are numbered 0, 3, 8, and 11 (counting from the top sideband).

The pattern shown in (a) of the normal CP in FIG. 9 ensures uniform distribution of the frequency domain of the RS, thereby facilitating the simplification of the implementation; (b) the pattern shown by the normal CP in FIG. 9 is located in the narrowband or the PRB by the reserved RS. On both sides, the channel estimation performance based on linear interpolation in the frequency domain is further improved. As shown in (c) normal CP in FIG. 9 and (d) normal CP in FIG. 9, it is assumed that the TDD special subframe configuration ratio is 7:6:1, that is, 7 OFDM symbols are used as DwPTS, and 6 OFDM symbols are used as The uplink and downlink GP and one OFDM symbol are used as the UpPTS, and the RS pattern is similar to (a) the normal CP in FIG. 9 and the (b) normal CP in FIG. 9, and details are not described herein again.

Embodiment 3

10 is an RS pattern of a CRS OFDM symbol in a non-LTE system versus LTE in accordance with an alternative embodiment of the present invention. A schematic diagram of a fixed offset of an RS pattern of a systematic CRS OFDM symbol;

For example, the normal CP type is taken as an example. As shown in (a) normal CP in Figure 10, the RS occupies 4 non-LTE system CRS OFDM symbols (numbered 3, 6, 9, and 12) and 4 in the time domain. LTE system CRS OFDM symbols (numbered 4, 7, 8, and 11); for OFDM symbols 4 and 11, the two resource unit positions occupied by the RS are two resource units occupied by the LTE system CRS in the above OFDM symbol (number is The offset of the position of 3 and 9) is -1. For OFDM symbols 7 and 8, the location of 2 resource elements occupied by the RS is relative to the position of 2 resource elements (numbers 3 and 9) occupied by the LTE system CRS in the above OFDM symbol. The offset is +1; it is assumed that the above-mentioned -1 or +1 bias remains unchanged. When the LTE system CRS pattern is determined according to the PCID, the RS pattern on the LTE system CRS OFDM symbol is actually determined according to the PCID; Symbols 3, 6, 9, and 12, the two resource unit positions occupied by the RS in the frequency domain are sequentially relative to the two resource units occupied by the CRS OFDM symbols (numbered 4, 7, 8, and 11) of the four LTE systems. The offset of the location is fixed to 0, and the reference signal pattern on the non-LTE system CRS OFDM symbol is also determined according to the PCID.

Taking the normal CP type as an example, as shown in (b) normal CP in Figure 10, the RS occupies 4 non-LTE system CRS OFDM symbols (numbered 3, 6, 9, and 12) and 4 LTE systems in the time domain. CRS OFDM symbols (numbered 4, 7, 8, and 11); for OFDM symbols 4, 7, 8, and 11, the two resource unit positions occupied by the RS are relative to the LTE system CRS in the two resource units occupied by the OFDM symbol ( The offsets of the positions 0 and 6) are +1; it is assumed that the above +1 offset remains unchanged. When the LTE system CRS pattern is determined according to the PCID, the RS pattern on the LTE system CRS OFDM symbol is actually based on the PCID. Determining; for OFDM symbols 3, 6, 9, and 12, the 2 resource unit positions occupied by the RS are sequentially relative to the 2 resource units occupied by the 4 LTE system CRS OFDM symbols (numbered 4, 7, 8, and 11) The offset of the location is fixed at 3. At this time, the PBCH reference signal pattern on the non-LTE system CRS OFDM symbol is also determined according to the PCID.

It should be noted that the case of the extended CP of (c) and (d) in FIG. 10 is similar to the case of the normal CP of (a) and (b) in FIG. 10 described above, and therefore, in the present embodiment This will not be repeated in the examples.

Embodiment 4

11 is a schematic diagram of a first type of RS pattern for transmitting physical downlink channel data under In-band and non-In-band operation, envisaged under In-band and non-In-band operation, in accordance with an alternative embodiment of the present invention. The 2-port first-class RS is used to transmit physical downlink channel data; for In-band operation, as shown in (a) In-band operation in Figure 11, the 2-port first-class RS is occupied in the time domain. 4 non-LTE system CRS OFDM symbol positions, each OFDM symbol occupies 4 resource units; the specific OFDM symbols are numbered 3, 6, 9, and 12, and the occupied resource units are numbered 0, 3, 6, and 9. For non-In-band operation, as shown in (b) non-In-band operation in FIG. 11, the 2-port first-class RS occupies 4 non-LTE system CRS OFDM symbol positions in the time domain, each OFDM symbol Occupying 2 resource elements; the specific OFDM symbol number is the same as the In-band operation, ie, numbers 3, 6, 9, and 12. For OFDM symbols 3 and 9, the resource elements are numbered 0 and 6, for OFDM Symbols 6 and 12, the number of resource units occupied are 3 and 9. The non-In-band operation The first type of RS pattern is completely included in the In-band operation of the first type of RS pattern, that is, the first type of RS pattern that is not In-band operation is the sub-pattern of the first type of RS pattern of the In-band operation.

12 is a diagram for transmitting physical downlink channels under In-band and non-In-band operations according to an alternative embodiment of the present invention. According to the schematic diagram of the second type of RS pattern, it is assumed that under the In-band and non-In-band operation, the 2-port second type RS is used to transmit the physical downlink channel data; for the In-band operation, as shown in FIG. (a) The In-band operation shows that the 2-port second-class RS is a 2-port (port 0 and port 1) LTE system CRS, occupying 4 OFDM symbol positions in the time domain, and each OFDM symbol occupies 4 The resource unit; the specific OFDM symbols are numbered 0, 4, 7, and 11, and the occupied resource units are numbered 0, 3, 6, and 9; for non-In-band operations, as shown in (b) of Figure 12 As shown in the in-band operation, the 2-port second-class RS occupies 4 OFDM symbol positions in the time domain, and each OFDM symbol occupies 2 resource units; the specific OFDM symbol number is the same as the In-band operation, that is, the number 0, 4, 7, and 11, for OFDM symbols 0 and 7, the occupied resource units are numbered 3 and 9, and for OFDM symbols 4 and 11, the occupied resource units are numbered 0 and 6. Finally, the non-In-band operation of the second type of RS pattern is completely included in the In-band operation of the second type of RS pattern, that is, the second type of RS pattern that is not in-band operation is the second type of RS pattern of the In-band operation. pattern.

13 is a diagram of a third type of RS pattern for transmitting physical downlink channel data under In-band and non-In-band operation, in accordance with an alternate embodiment of the present invention. It is envisaged that under In-band and non-In-band operation, a 2-port type 3 RS is used to transmit physical downlink channel data; for In-band operation, as shown in (a) In-band operation in Figure 13, The second-port RS pattern of the 2-port is the first-type RS pattern of the 2-port shown in (a) In-band operation in FIG. 11 and the 2-port type shown in (a) In-band operation in FIG. For the superposition of the second type of RS patterns, the 2-port RSs occupy 8 OFDM symbol positions in the time domain, and each OFDM symbol occupies 4 resource units; the specific OFDM symbols are numbered 1, 3, 4, and 6. 7, 9, 11, and 12, the resource units are numbered 0, 3, 6, and 9; for non-In-band operations, as shown in (b) non-In-band operation in Figure 13, 2-port The third type of RS pattern is the first type of RS pattern of the 2-port shown in Figure 11 (b) non-In-band operation and the second port of the 2 port shown in Figure 12 (b) non-In-band operation. For the superposition of the RS-like pattern, the 2-port RS of the second type occupies 8 OFDM symbol positions in the time domain, and each OFDM symbol occupies 2 resource units; the specific OFDM symbol number is the same as the In-band operation, that is, the number For 1, 3, 4, 6, 7, 9, 11 and 12. For OFDM symbols 3, 4, 9, and 11, the number of resource elements occupied is 0 and 6, and for OFDM symbols 1, 6, 7, and 12, the resource unit numbers are 3 and 9. Finally, the third type of RS pattern of non-In-band operation is completely included in the third type RS pattern of In-band operation, that is, the third type RS pattern of non-In-band operation is the third type RS pattern of In-band operation. Sub-pattern.

Embodiment 5

When the physical downlink channel data is transmitted according to the third type RS, and the third type RS pattern is a superposition of the 2-port RS type pattern and the 4-port RS type pattern, if the physical downlink channel data is assumed to be at the 2 port For the upper transmission, in order to obtain the 2-port channel coefficient of the physical downlink channel data transmitted on the 2-port through the 4-port RS, the following manner can be adopted:

The transmitting side maps 2 ports to 4 ports according to a 4×2 dimension precoding matrix; for example, the above process is implemented according to the following equation: s _4×1 = W _4×2 · s _2×1 , where s _2×1 And s _4×1 respectively represent 2-port data before mapping and 4-port data after mapping, and W4×2 represents pre-coding matrix;

The receiving side acquires the equivalent channel coefficient of the 2-port according to the 4-port channel coefficient estimated by the 4×2 dimension precoding matrix W _4×2 and the 4-port reference signal; for example, it is assumed that the number of receiving antennas is 1, according to the following equation Implement the above process:

H' _{1 × 2} = H _{1 × 4} · W _{4 × 2} , where H _{1 × 4} and H' _{1 × 2} represent a 4-port channel coefficient matrix and a 2-port equivalent channel coefficient matrix, respectively.

Wherein, different resource units can use the same precoding matrix W _4×2 ,

For example, the precoding matrix W _4×2 is always fixed to the following form:

Or, different resource units use different precoding matrices W _4×2 ,

For example, the precoding matrix W _4×2 is of the form:

W _{4 × 2} (i) = P (i) _{4 × 2} ,

P(i) _4×2 ∈{P ₀ , P ₁ ,...,P _K-1 }; or,

W _{4 × 2} (i) = P (i) _{4 × 2} D (i) _{2 × 2} U _{2 × 2} ,

P(i) _4×2 ∈{P ₀ , P ₁ ,...,P _K-1 },

By introducing the matrices D(i) _2×2 and U _2×2 , the delay diversity effect can be achieved;

Where W _4×2 (i) represents a precoding matrix of the i th resource unit,

Wherein P _4×2 (i) is a matrix of a fixed or configurable matrix set of size K, and specifically which matrix is determined according to the resource unit index i.

Example 6 (correspondence 11 and weight 12)

Reference signal sequence definition:

Wherein, N _init is a pseudo random sequence generator initialization interval, the unit is a subframe or a radio frame, and n is a number of an initialization interval (continuous N _init subframes or radio frames), and M is within a range of each initialization interval N _init . A reference signal port occupies the number of resource units.

Wherein, the pseudo-random sequence c(·) is based on the prior art definition of the LTE system, and the pseudo-random sequence generator is initialized according to one of the following equations at the beginning of the initialization interval Nini:

or,

among them, The N _ID ^cell indicates the physical cell identifier PCID.

Embodiments of the present invention also provide a storage medium. Optionally, in the embodiment, the foregoing storage medium may be configured to store program code for performing the following steps:

Step S1: acquiring a category of the reference signal RS;

Step S2: The physical downlink channel data is transmitted according to the reference signal RS of one of the following; wherein the RS includes: a first type RS, a second type RS, and a third type RS.

For example, the specific examples in this embodiment may refer to the examples described in the foregoing embodiments and the optional embodiments, and details are not described herein again.

It will be apparent to those skilled in the art that the various modules or steps of the present invention described above can be implemented by a general-purpose computing device that can be centralized on a single computing device or distributed across a network of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. The steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof are fabricated as a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software.

The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Industrial applicability

Claims

A method of transmitting data, including:

Transmitting physical downlink channel data according to one of the following reference signals RS;

The RS includes: a first type RS, a second type RS, and a third type RS.
The method of claim 1 wherein

The first type of RS pattern does not overlap with the long-term evolution LTE system cell-specific reference signal CRS pattern;

The second type of RS pattern is the same as the pattern of the LTE system CRS, or the pattern of the second type of RS is a sub-pattern of the CRS pattern of the LTE system;

The third type of RS pattern is a superposition of the first type of RS pattern and the second type of RS pattern.
The method of claim 1 or 2, wherein the RS is a 2-port RS.
The method of claim 3, wherein

In the in-band operation, when the physical downlink channel data is transmitted according to the second type of RS and the 4-port LTE system CRS is configured, the second type of RS is a designated 2-port LTE system CRS, where the designation Port 2 is port 0 and port 1, or port 0 and port 2, or port 1 and port 3.
The method of claim 3, wherein

When the physical downlink channel data is transmitted according to the third type of RS, the third type of RS is a superposition of a 2-port type RS and a 2-port first-type RS; wherein, the first type of RS The first port of the first type of RS is the same port as the second port of the second type of RS.
The method of claim 4, wherein

Under the in-band operation, when the 4-port LTE system CRS is configured, the 2-port second-class RS is a 2-port LTE system CRS, and the designated 2 port is port 0 and port 1, or port 0. And port 2, or port 1 and port 3.
The method according to claim 4 or 6, wherein

The designated 2 port is fixed as port 0 and port 1; or the designated 2 port is changed with a subframe;

When the designated 2 port changes with the subframe, in a part of the subframe, the designated 2 port is port 0 and port 2, and in another part of the subframe, the designated 2 port is port 1 and port 3. .
The method of claim 2, wherein the non-overlapping of the first type of RS pattern with the LTE system CRS pattern comprises:

When the subframe in which the physical downlink channel data is transmitted is a normal subframe, the first type of RS occupies 4 LTE system CRS orthogonal frequency division multiplexing OFDM symbol positions in the time domain, where each of the OFDMs Symbol takes up 4 Resource unit; or,

The first type of RS occupies 4 non-LTE system CRS OFDM symbol positions in the time domain, where each of the OFDM symbols occupies 4 resource units; or

The first type of RS occupies 8 OFDM symbol positions in the time domain, wherein the 8 OFDM symbols include an LTE system CRS and a non-LTE system CRS OFDM symbol, and each of the OFDM symbols occupies 2 resource units.
The method of claim 2, wherein the non-overlapping of the first type of RS pattern with the LTE system CRS pattern comprises:

When the subframe in which the physical downlink channel data is transmitted is a time division duplex TDD system special subframe, the first type of RS occupies 1 or 2 LTE system CRS OFDM symbol positions in the time domain, wherein each of the foregoing OFDM symbols occupy 4 resource elements; or,

The first type of RS occupies 1 or 2 non-LTE system CRS OFDM symbol positions in the time domain, where each of the OFDM symbols occupies 4 resource units; or

The first type of RS occupies 4 non-LTE system CRS OFDM symbol locations in the time domain, where each of the OFDM symbols occupies 2 or 4 resource units; or

The first type of RS occupies 4 OFDM symbol positions in the time domain, where 4 of the OFDM symbols include an LTE system CRS and a non-LTE system CRS OFDM symbol, each of the OFDM symbols occupying 2 or 4 resource units .
The method according to claim 8 or 9, wherein

When the OFDM symbols occupied by the first type of RS are all non-LTE system CRS OFDM symbols, the first type of RS pattern is fixed, or the first type of RS pattern is determined according to a physical cell identifier PCID.
The method according to claim 8 or 9, wherein

When the OFDM symbol occupied by the first type of RS includes: a non-LTE system CRS OFDM symbol and an LTE system CRS OFDM symbol, the non-LTE system CRS OFDM symbol number is the same as the LTE system CRS OFDM symbol number;

Wherein the first type of RS pattern on the non-LTE system CRS OFDM symbol is fixed, and the first type of RS pattern on the LTE system CRS OFDM symbol is determined according to a physical cell identifier PCID, or The first type of RS pattern on the non-LTE system CRS OFDM symbol and the first type of RS pattern on the LTE system CRS OFDM symbol are all determined according to the PCID, and the non-LTE system CRS The first type of RS pattern on the OFDM symbol has a fixed offset L in the frequency domain relative to the first type of RS pattern on the LTE system CRS OFDM symbol, where L is an integer greater than or equal to zero.
The method of claim 1 wherein

In the in-band operation and non-in-band operation, when the same RS category is used to transmit the physical downlink channel data, The physical downlink channel data is transmitted according to different RS patterns; wherein the non-in-band operation is a guard band operation or an independent operation.
The method of claim 12, wherein the non-in-band operated RS pattern is a sub-pattern of the in-band operated RS pattern when the physical downlink channel data is transmitted in accordance with different RS patterns.
The method according to claim 1, wherein the RS category for transmitting physical downlink channel data is determined by at least one of: a manner of pre-defined configuration, a manner according to an overlay level and/or an aggregation level, and a signaling indication manner .
The method of claim 1 or 2, wherein the method further comprises:

Transmitting physical downlink channel data according to the second type RS of the K2 port, or transmitting physical downlink channel data according to the third type RS, and the third type RS pattern is the first of the K1 port When superimposing the RS-like pattern and the second-type RS pattern of the K2 port, the transmitting side maps the K1 port to the K2 port according to the precoding matrix of the K2×K1 dimension, and the receiving side pre-codes according to the K2×K1 dimension. The matrix and the estimated channel coefficients of the K2 port obtain the equivalent channel coefficients of the K1 port;

Where K1 and K2 are integers greater than 0 and K1 is less than K2.
The method according to claim 1 or 2, wherein the interval initialized by the RS sequence generator comprises: N init subframes or radio frames, wherein the N init is an integer greater than or equal to 1.
The method of claim 16 wherein the initialization value of the RS sequence generator is determined in accordance with at least one of:

Determined according to the physical cell identifier PCID;

Determined according to the PCID and the cyclic prefix CP type;

Determining according to the RS sequence initialization interval number and the PCID;

The initialization is performed according to the RS sequence initialization interval number, the PCID, and the cyclic prefix CP type.
The method of claim 1 wherein the method further comprises:

In the in-band operation, the sequence value and/or the port number of the second type RS or the third type RS are indicated by signaling.
The method of claim 1 wherein the method further comprises:

In non-in-band operation, the subframes of the RS are transmitted and/or configured by signaling.
The method of claim 1 wherein

In the non-in-band operation, the subframe in which the synchronization signal SS is transmitted is not used to transmit the RS; or the OFDM symbol used to transmit the SS in the subframe in which the SS is transmitted is not used to transmit the RS.
The method of claim 1 wherein

The RS sequence is a sub-sequence of length 2 in the LTE system CRS sequence of length 2N RB max, DL , where N RB max, DL represents the maximum downlink bandwidth configuration of the LTE system.
The method of claim 21, wherein the RS sequence is obtained according to the following operation:

Predefining or signaling the parameters m 0 and m 1 to take values;

The RS sequence is obtained according to the parameters m 0 and m 1 and the following equation:

The r l, ns (i) represents the RS sequence, the N ID cell represents a physical cell identifier PCID, the n s represents a slot index, and the l represents an OFDM symbol index, and the N CP depends type in the CP value of 0 or 1, c init represents the pseudo-random sequence c (·) initialization value.
The method of claim 22, wherein

The parameters m 0 and m 1 are predefined to be 0 and 1 respectively; or, the parameters m 0 and m 1 are predefined to be N RB max, DL -1 and N RB max, DL , respectively .
The method of claim 22, wherein

Through signaling indicates the m 0 and m 1 are parameter values, the parameter values {m 0, m 1} belonging to a predefined set.
The method of claim 22, wherein

The RS is used to transmit the physical broadcast channel PBCH data, and/or, in the non-in-band operation, when the RS is used to transmit the physical downlink control channel PDCCH and the physical downlink shared channel PDSCH data, it is determined by a predefined manner. The parameters m 0 and m 1 take values.
The method of claim 21, wherein

The sequence of the RS for transmitting PBCH data is the same as the sequence of the RS for transmitting PDCCH and PDSCH data under non-in-band operation.
The method according to claim 1 or 2, wherein

In an in-band operation, when an LTE multicast broadcast single frequency network MBSFN subframe that does not transmit a multicast broadcast multimedia service MBMS service is used for NB-IOT physical downlink channel data transmission, the RS is in the MBSFN subframe. Send on the MBSFN area;

When an LTE MBSFN subframe that does not transmit an MBMS service is not used for NB-IOT physical downlink channel data transmission, the RS is not transmitted on the MBSFN area of the MBSFN subframe.
A data transmission device includes:

a transmission module, configured to transmit physical downlink channel data according to one of the following reference signals RS;

The RS includes: a first type RS, a second type RS, and a third type RS.