CN113259072A

CN113259072A - Reference signal transmission method, terminal and network equipment

Info

Publication number: CN113259072A
Application number: CN202010082710.9A
Authority: CN
Inventors: 韩波; 缪德山; 康绍莉; 孙韶辉
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2020-02-07
Filing date: 2020-02-07
Publication date: 2021-08-13
Anticipated expiration: 2040-02-07
Also published as: CN113259072B

Abstract

The embodiment of the invention provides a reference signal transmission method, network equipment and a terminal, wherein the method comprises the following steps: the network equipment carries out cyclic mapping on the first reference symbol in the downlink bandwidth from the target frequency domain position to generate a downlink reference signal; the network equipment sends a downlink reference signal to the terminal, the terminal receives a first reference symbol in a downlink bandwidth from a target frequency domain position according to a downlink reference signal mapping mode, and obtains a reference symbol for demodulating a downlink physical channel from the first reference symbol. In the embodiment of the invention, through a mode of full-bandwidth cyclic mapping reference symbols, when the working bandwidth is not fixed and the SSB sending position is not fixed, the terminal can accurately obtain the reference symbols for demodulating the physical channel for functions of demodulation, synchronous tracking, measurement and the like, and under the condition that the link budget of a communication system is poor, the large-bandwidth reference symbols have greater effects on channel estimation, measurement and time-frequency synchronization.

Description

Reference signal transmission method, terminal and network equipment

Technical Field

The embodiment of the invention relates to the technical field of communication, in particular to a reference signal transmission method, a terminal and network equipment.

Background

Fifth generation communication technology (5)^thgeneration, 5G) New wireless (New Radio, NR) wireless communication systems have the characteristics of large capacity, low delay, capability of supporting different configuration sets, and flexibility, and the 5G NR-based technology will be widely applied to other industrial applications, and communication systems designed based on 5G will emerge in large quantities, and adaptively modify the communication systems according to the characteristics and requirements of application scenarios. In a high-speed moving scene, particularly in a satellite communication system of a non-terrestrial network (NTN), because a satellite moves at a high speed, doppler frequency is large, a depression elevation angle from the satellite to a terminal is also continuously changed, doppler frequency change is also fast, a full-bandwidth reference symbol is not frequently generated periodically, and channel estimation and doppler frequency offset tracking are not facilitated to be accurately performed.

In an application scenario of high-speed movement, the Doppler frequency shift can be accurately estimated and compensated only by continuous tracking, the longer the length of the reference symbol is, the better the channel estimation precision and the frequency offset estimation precision are, and the communication system with the frequent reference symbol is more favorable for continuously tracking the change of the Doppler frequency shift and improving the channel estimation precision.

In the existing 5G technology, the downlink reference signal is based on channel configuration or UE specific user, so it is not suitable for the requirement of the satellite communication system. In order to maintain good time-frequency synchronization tracking capability, a cell-specific or satellite beam-specific reference signal needs to be introduced to improve synchronization performance, and at this time, a terminal cannot acquire a mapping mode of the reference signal according to a reference signal rule of 5G. The main problems are that: 1) The starting point of frequency mapping of the cell common reference Signal corresponds to the starting point of frequency of a Synchronization Signal Block (SSB) (which may also be referred to as SSB), and when the bandwidth of the frequency band is large, if the starting point of the SSB is uncertain, the bandwidth of the common reference Signal is uncertain; 2) according to the existing 5G technology, the UE cannot know the maximum transmission bandwidth of the downlink channel before detecting the broadcast message PBCH and the SIB1, that is, cannot determine the frequency mapping manner of the cell common reference signal and cannot obtain an accurate cell common reference symbol, which results in a large problem of demodulation of the SIB 1.

Disclosure of Invention

The embodiment of the invention provides a reference signal transmission method, a terminal and network equipment, and solves the problem that a terminal in the prior art cannot accurately obtain a reference symbol.

In a first aspect, an embodiment of the present invention provides a reference signal transmission method, which is applied to a network device, and the method includes:

circularly mapping the first reference symbol in the downlink bandwidth from the target frequency domain position to obtain a downlink reference signal;

sending the downlink reference signal to a terminal;

wherein the target frequency domain location is relatively fixed with respect to the frequency domain location of the SSB.

Further, the method further comprises:

sending a master information block MIB through a physical broadcast channel PBCH, wherein the MIB comprises a downlink bandwidth indication bit, and the downlink bandwidth indication bit is used for indicating the downlink bandwidth to the terminal.

Further, the target frequency domain position is a frequency domain position having a fixed offset from the frequency domain position of subcarrier 0 of the SSB;

the loop mapping includes:

performing ascending mapping from the target frequency domain position, and starting ascending mapping from the first subcarrier at the lower boundary of the downlink bandwidth when mapping to the upper boundary of the downlink bandwidth;

in the frequency domain, the reference symbols are mapped continuously or intermittently by subcarriers, and in the time domain, a plurality of reference symbols are configured in one transmission time interval.

In a second aspect, an embodiment of the present invention provides a reference signal transmission method, which is applied to a terminal, and the method includes:

receiving a downlink reference signal from a network device;

according to the downlink reference signal, starting from a target frequency domain position, and according to a cyclic mapping mode, acquiring a reference symbol for demodulating a downlink physical channel from a first reference symbol in a downlink bandwidth;

the loop mapping includes:

Further, the method further comprises:

under the condition that the subcarrier number of the target frequency domain position is less than or equal to the position of the SSB subcarrier 0, K subcarriers are selected from the target frequency domain position plus OFFSET _ R according to the subcarrier sequence number increasing direction, and a second reference symbol for demodulating PBCH is obtained from the first reference symbol through the K subcarriers;

when the subcarrier number of the target frequency domain position is larger than the length of the SSB subcarrier 0 plus the SSB subcarrier, K subcarriers are selected from the target frequency domain position minus OFFSET _ R according to the subcarrier sequence number increasing direction, and a second reference symbol for demodulating PBCH is obtained from the first reference symbol through the K subcarriers;

under the condition that the subcarrier number of the target frequency domain position is positioned between SSB subcarrier 0 and an upper boundary of an SSB block, selecting K minus OFFSET _ R subcarrier from the target frequency domain position according to the subcarrier sequence number increasing direction, selecting OFFSET _ R subcarrier from the target frequency domain position according to the subcarrier sequence number decreasing direction, and after two sections of reference symbols obtained from the first reference symbol through the K subcarriers are cascaded, demodulating a second reference symbol of PBCH;

wherein K is the number of subcarriers occupied by the SSB, and OFFSET _ R is a fixed OFFSET between the target frequency domain position and the frequency domain position of subcarrier 0 of the SSB.

Further, the target frequency domain position is the position of SSB subcarrier 0;

after obtaining second reference symbols for demodulating PBCH from the first reference symbols, the method further comprises:

demodulating the PBCH through the second reference symbol to obtain a Main Information Block (MIB) carried on the PBCH, wherein the MIB comprises a downlink bandwidth indication bit;

and determining the downlink bandwidth according to the downlink bandwidth indication bit.

Demodulating the PBCH through the second reference symbol to obtain configuration information and subcarrier offset K of a Physical Downlink Control Channel (PDCCH) related to a first system information block (SIB 1)_SSB；

According to the configuration information of the PDCCH and the K_SSBObtaining, from the first reference symbols, third reference symbols for demodulating the PDCCH;

wherein, K is_SSBRepresenting data from a common resource block

Subcarrier 0 of the SSB to subcarrier 0 of the SSB, the

And the number of the common resource block where the subcarrier 0 of the first resource block of the SSB is located is shown.

Further, the configuration information of the PDCCH includes a first group of indication bits and a second group of indication bits, where the first group of indication bits is used to indicate a configuration of a control resource set, CORESET #0, and the second group of indication bits is used to indicate a configuration of a common search space, CSS;

the configuration information according to the PDCCH and the K_SSBAcquiring a second reference symbol for demodulating the PDCCH, comprising:

determining the number of resource blocks occupied by the CORESET #0 according to the configuration of the CORESET #0

And an offset between the CORESET #0 minimum RB index to a minimum common resource block index that overlaps the SSB first resource block;

according to the position of the sub-carrier 0 of the SSB, the

The offset and the K_SSBAnd obtaining the third reference symbol from the first reference symbol.

Further, the position of the subcarrier 0 according to the SSB, the

The offset and the K_SSBObtaining the third reference symbol from the first reference symbol, including:

if the CORESET #0 and the SSB are mapped in a time division multiplexing TDM manner, and there is an overlap in the frequency domain,

then pass through

And

obtaining the third reference symbol from the first reference symbol;

if the CORESET #0 and the SSB are in TDM manner, there is no overlap in frequency domain, and the CORESET #0 is below the SSB,

then pass through

And

obtaining the third reference symbol from the first reference symbol;

if the CORESET #0 and the SSB are TDM-based, there is no overlap in the frequency domain, and the CORESET #0 is above the SSB,

then pass through

And

obtaining the third reference symbol from the first reference symbol;

if the CORESET #0 and the SSB are mapped in a frequency division multiplexing FDM manner, and both have the same time-frequency resource allocation, and the CORESET #0 is below the SSB,

then pass through

And y-n-1 obtains the third reference symbol from the first reference symbol;

if the CORESET #0 and the SSB are mapped in FDM mode, both have the same time-frequency resource allocation, and the CORESET #0 is above the SSB,

then by x ═ K and

obtaining the third reference from the first reference symbolA symbol;

wherein x and y are indices of both ends of the third reference symbol in the first reference symbol, respectively, n is a total length of reference symbol mapping,

for indicating the number of sub-carriers per resource block.

Further, the obtaining, according to the cyclic mapping manner, a reference symbol for demodulating a downlink physical channel from the first reference symbol in the downlink bandwidth further includes:

demodulating the PDCCH through the third reference symbol to obtain configuration information of a Physical Downlink Shared Channel (PDSCH) carrying the SIB 1;

demodulating the PDSCH through the third reference symbol to obtain the position of a common reference point PointA and the position of an initial resource block of a working bandwidth BWP

And number of consecutive resource blocks

According to the position of the PointA,

And

obtaining a fourth reference symbol of the BWP from the first reference symbol.

Further, the position according to the PointA is,

And

acquiring a fourth reference symbol of the BWP from the first reference symbol, including:

by passing

And

obtaining the fourth reference symbol from the first reference symbol;

wherein x 'and y' are indices of both ends of the fourth reference symbol in the first reference symbol, respectively,

for indicating the number of sub-carriers per resource block, K_SSB' by said K_SSBConverted according to the subcarrier spacing of the BWP configuration,

from the above

And converting the subcarrier spacing configured according to the BWP.

In a third aspect, an embodiment of the present invention provides a network device, including:

the mapping module is used for circularly mapping the first reference symbol in the downlink bandwidth from the target frequency domain position to generate a downlink reference signal;

a first sending module, configured to send the downlink reference signal to a terminal;

Further, the network device further includes:

a second sending module, configured to send a master information block MIB via a physical broadcast channel PBCH, where the MIB includes a downlink bandwidth indication bit, and the downlink bandwidth indication bit is used to indicate the downlink bandwidth to the terminal.

the loop mapping includes:

In a fourth aspect, an embodiment of the present invention is directed to a terminal, including:

a first receiving module, configured to receive a downlink reference signal from a network device;

an obtaining module, configured to obtain, according to the downlink reference signal, a reference symbol for demodulating a downlink physical channel from a first reference symbol in a downlink bandwidth according to a cyclic mapping manner starting from a target frequency domain position;

Further, the terminal further includes:

a second receiving module, configured to receive a master information block MIB via a physical broadcast channel PBCH, where the MIB includes a downlink bandwidth indication bit;

the loop mapping includes:

Further, the obtaining, according to the cyclic mapping manner, a reference symbol for demodulating a downlink physical channel from the first reference symbol includes:

the obtaining module is further configured to:

According to the configuration information of the PDCCH and the K_SSBFrom the above to the aboveObtaining a third reference symbol for demodulating the PDCCH from the first reference symbols;

wherein, K is_SSBRepresenting data from a common resource block

Subcarrier 0 of the SSB to subcarrier 0 of the SSB, the

the obtaining module is further configured to:

according to the position of the sub-carrier 0 of the SSB, the

Further, the obtaining module is further configured to:

then pass through

And

obtaining the third reference symbol from the first reference symbol;

then pass through

And

obtaining the third reference symbol from the first reference symbol;

then pass through

And

obtaining the third reference symbol from the first reference symbol;

then pass through

And y-n-1 is obtained from the first reference symbolThe third reference symbol;

then by x ═ K and

obtaining the third reference symbol from the first reference symbol;

for indicating the number of sub-carriers per resource block.

Further, the obtaining module is further configured to:

And number of consecutive resource blocks

According to the position of the PointA,

And

obtaining a fourth reference symbol of the BWP from the first reference symbol.

Further, the obtaining module is further configured to:

by passing

And

obtaining the fourth reference symbol from the first reference symbol;

from the above

And converting the subcarrier spacing configured according to the BWP.

In a fifth aspect, an embodiment of the present invention provides a network device, including a processor, a memory, and a program stored on the memory and executable on the processor, where the program is executed by the processor to implement the operations of the reference signal transmission method according to the first aspect.

In a sixth aspect, an embodiment of the present invention provides a terminal, including a processor, a memory, and a program stored in the memory and being executable on the processor, where the program is executed by the processor to implement the operations of the reference signal transmission method according to the second aspect.

In a seventh aspect, an embodiment of the present invention provides a processor-readable storage medium, where a program is stored on the processor-readable storage medium, and when the program is executed by a processor, the program implements the operations of the reference signal transmission method according to the first aspect, or the operations of the reference signal transmission method according to the second aspect.

In the embodiment of the invention, the first reference symbol in the downlink bandwidth is circularly mapped from the position of the target frequency domain, and through the way of circularly mapping the reference symbol with the full bandwidth, when the working bandwidth is not fixed and the SSB sending position is not fixed, the terminal can accurately obtain the reference symbol for demodulating the physical channel for the functions of demodulation, synchronous tracking, measurement and the like, and under the condition that the link budget of a communication system is poor, the large-bandwidth reference symbol has greater effects on channel estimation, measurement and time-frequency synchronization.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

Fig. 1a is a schematic flow chart of a reference signal transmission method according to an embodiment of the present invention;

fig. 1b is a schematic diagram of an application scenario provided in the embodiment of the present invention;

fig. 2 is a second schematic flowchart of a reference signal transmission method according to an embodiment of the present invention;

fig. 3 is a second schematic view of an application scenario provided by the embodiment of the present invention;

fig. 4a is a third schematic view of an application scenario provided by the embodiment of the present invention;

FIG. 4b is a fourth schematic diagram of an application scenario provided by the embodiment of the present invention;

FIG. 4c is a fifth schematic view of an application scenario provided by the embodiment of the present invention;

FIG. 4d is a sixth schematic view of an application scenario provided by the embodiment of the present invention;

fig. 4e is a seventh schematic diagram of an application scenario provided in the embodiment of the present invention;

fig. 5 is an eighth schematic view of an application scenario provided by the embodiment of the present invention;

fig. 6 is a schematic structural diagram of a network device according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a terminal according to an embodiment of the present invention;

fig. 8 is a second schematic structural diagram of a network device according to an embodiment of the present invention;

fig. 9 is a second schematic structural diagram of a terminal according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without any inventive step, are within the scope of the present invention.

In the embodiments of the present invention, words such as "exemplary" or "for example" are used to mean serving as examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "e.g.," in an embodiment of the present invention should not be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.

Herein, relational terms such as "first" and "second", and the like, are used solely to distinguish one from another between similar names, and do not imply a relationship or order between the names.

In the 5G NR wireless communication system, there is no frequent reference symbol, the reference symbol is transmitted only when needed, and demodulation reference symbols are carried on a Physical Downlink Shared Channel (PDSCH), a Physical Downlink Control Channel (PDCCH), a Physical Broadcast Channel (PBCH), a Physical Uplink Shared Channel (PUSCH), and a Physical Uplink Control Channel (PUCCH), respectively, each Physical Channel has a dedicated reference symbol, and the bandwidth of the reference symbol and the bandwidth of the Physical Channel are consistent, so that a terminal can accurately obtain the length of the reference symbol and frequency domain location information. For example: the method includes that 1, 2 and 3 symbols in SSB transmit PBCH, and simultaneously, a symbol transmitting PBCH also carries a Demodulation Reference Signal (DMRS) of PBCH, so that after a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS) are detected, the starting position and bandwidth of the DMRS of PBCH can be determined according to the characteristics of SSB resource mapping. Similarly, after the resource allocation information of the channels is determined, the DMRS information can be extracted according to the DMRS resource mapping rule of the demodulation reference symbol of each channel. For the PDCCH, when the network informs the downlink control channel bandwidth of the UE, the mapping mode of the reference signal is also predefined; for the PDSCH, after the network notifies the PDSCH of resource allocation through the control channel, the resource of the reference symbol is also determined according to the predetermined rule, and the terminal does not need to obtain the configuration information of the reference signal through other configurations.

For a communication system designed based on a 5G standard, if a self-contained demodulation reference symbol is not sent in an SSB, or the SSB frequency domain sending position is not fixed and the downlink sending bandwidth is not fixed, a terminal does not know the frequency domain position information of the beginning and the end of the reference symbol and does not know which reference symbol should be used. Therefore, a method for solving how to obtain corresponding reference symbols for physical channel demodulation or system measurement by a terminal under the condition that the downlink transmission bandwidth is not fixed and the SSB transmission position is not fixed is needed.

In the embodiment of the present invention, the network device may be a network side device (e.g., a next generation base station (gNB) or a Transmission and Reception Point (TRP)) in a 5G system.

In the embodiment of the present invention, the terminal may be a Mobile phone, a tablet Computer, a notebook Computer, an Ultra-Mobile Personal Computer (UMPC), a netbook, a Personal Digital Assistant (PDA), or the like.

Referring to fig. 1a, an embodiment of the present invention provides a reference signal transmission method, where an execution main body of the method is a network device, and the method includes the following specific steps:

step 101: circularly mapping the first reference symbol in a downlink bandwidth from a target frequency domain position to generate a downlink reference signal;

in the embodiment of the present invention, the target frequency domain position is relatively fixed to the frequency domain position of the SSB, and the target frequency domain position is the start mapping position of the circular mapping. And circularly mapping the first reference symbol to obtain a downlink reference signal which needs to be sent to the terminal.

Specifically, the target frequency domain position is a frequency domain position having a fixed offset from the frequency domain position of subcarrier 0 of the SSB; the circular mapping includes: performing ascending mapping from a target frequency domain position, and starting ascending mapping from a first subcarrier at a lower boundary of a downlink bandwidth when mapping to an upper boundary of the downlink bandwidth;

in the frequency domain, the reference symbols are mapped by continuous subcarriers or by spaced subcarriers; in the time domain, a plurality of reference symbols may be configured within one transmission time interval (e.g., a slot or a subframe).

Referring to fig. 1b, a cyclic mapping manner is shown, wherein a target frequency domain position is a frequency domain position corresponding to subcarrier 0 of the SSB, and reference symbol R represents a first reference symbol in a downlink bandwidth. Specifically, the reference symbol R is mapped in ascending order of subcarriers starting from subcarrier 0 of the lowest numbered resource block of the SSB, and when the reference symbol R index mapped to the upper boundary of the downlink bandwidth is m-1, the reference signal continues to map the reference symbol R index from the first subcarrier (i.e., the common reference point PointA) of the lower boundary of the downlink bandwidth to m, and is mapped in ascending order until the lowest resource block of the SSB block.

In some embodiments, the method further comprises: a Master Information Block (MIB) is sent via PBCH, and the MIB includes downlink bandwidth indication bits used for indicating a downlink bandwidth to a terminal.

It can be understood that, because the number of bits carried by the PBCH is limited, the number of bits used for indicating the downlink bandwidth in the PBCH is limited, for example, 3 bits may be specified to indicate the downlink bandwidth indication, and the 3 bits may indicate at most 8 possible downlink bandwidths.

Step 102: sending a downlink reference signal to a terminal;

in this embodiment of the present invention, a downlink reference signal is sent to a terminal, and a reference symbol for demodulating a downlink physical channel is obtained from a first reference symbol in a downlink bandwidth according to a cyclic mapping manner from a target frequency domain position according to the downlink reference signal, where the downlink physical channel may include: PBCH, PDCCH, PDSCH, working bandwidth BWP, etc., and the specific acquisition flow is described in the subsequent terminal side method flow.

In the embodiment of the invention, the first reference symbol in the downlink bandwidth is circularly mapped from the target frequency domain position, and through the way of circularly mapping the reference symbol in the full bandwidth, when the working bandwidth is not fixed and the SSB sending position is not fixed, the terminal can accurately obtain the frequency domain mapping starting position of the reference symbol to obtain the reference symbol required by physical channel estimation. The full-bandwidth reference symbol mapping can be used for demodulation and system measurement of a physical channel, and is beneficial to continuously tracking Doppler frequency shift and accurately estimating and compensating Doppler frequency shift brought by high-speed motion in an application scene of high-speed motion by a terminal, the longer the length of a reference symbol is, the better the channel estimation precision and the frequency shift estimation precision are, and particularly before RRC connection is established, the longer the reference symbol can be utilized to the greatest extent to carry out channel estimation and frequency shift estimation and other system measurement.

Referring to fig. 2, an embodiment of the present invention provides a reference signal transmission method, where an execution subject of the method is a terminal, and the method includes the following specific steps:

step 201: receiving a downlink reference signal from a network device;

step 202: according to the downlink reference signal, starting from a target frequency domain position, and according to a cyclic mapping mode, acquiring a reference symbol for demodulating a downlink physical channel from a first reference symbol in a downlink bandwidth;

in the embodiment of the present invention, the downlink reference signal is obtained by the network device by circularly mapping the first reference symbol in the downlink bandwidth. After receiving the downlink reference signal, the terminal acquires a reference symbol for demodulating a downlink physical channel from the first reference symbol in the downlink bandwidth by using the same cyclic mapping mode from the target frequency domain position so as to demodulate the channel and measure the system.

The target frequency domain position is relatively fixed with the frequency domain position of the SSB, and the target frequency domain position is the start mapping position of the circular mapping. And circularly mapping the first reference symbol to obtain a downlink reference signal to be sent to the terminal.

In the embodiment of the present invention, a terminal extracts a reference signal required by a physical channel according to cyclic mapping, and the present embodiment is described by using an example of mapping reference symbols on consecutive subcarriers.

In some embodiments, obtaining the second reference symbol for demodulating the PBCH from the first reference symbol includes:

the number of subcarriers occupied by the SSB is defined as K, and the fixed OFFSET between the target frequency domain position and the frequency domain position of subcarrier 0 of the SSB is defined as OFFSET _ R.

The positions of boundary subcarriers located on the SSB subcarrier 0 and the SSB block according to the subcarrier number of the target frequency domain position can be classified into three cases:

the first condition is as follows: the subcarrier number of the target frequency domain position is less than or equal to the position of SSB subcarrier 0;

case two: the subcarrier number of the target frequency domain position is greater than the SSB subcarrier 0 plus the SSB subcarrier length;

case three: the subcarrier number of the target frequency domain position is positioned between SSB subcarrier 0 and the upper boundary of the SSB block;

for case one: selecting K subcarriers from the target frequency domain position plus OFFSET _ R according to the subcarrier sequence number increasing direction, and acquiring a second reference symbol for demodulating PBCH from the first reference symbol through the K subcarriers;

for case two: k subcarriers are selected from the target frequency domain position minus OFFSET _ R according to the subcarrier sequence number increasing direction, and a second reference symbol for demodulating PBCH is obtained from the first reference symbol through the K subcarriers;

for case three: selecting K minus OFFSET _ R subcarriers from the target frequency domain position according to the subcarrier sequence number increasing direction, selecting OFFSET _ R subcarriers from the target frequency domain position according to the subcarrier sequence number decreasing direction, and after two sections of reference symbols obtained from a first reference symbol through the K subcarriers are cascaded, demodulating a second reference symbol of PBCH;

it can be understood that, when acquiring the second reference symbol, the terminal only needs to map and select K subcarriers from the target frequency domain position to determine the second reference symbol.

It should be noted that, for the acquisition process of the reference symbols of other physical channels (e.g. PDCCH, PDSCH, etc.), the same as the PBCH, the difference that the subcarrier number of the target frequency domain position is located at the SSB subcarrier 0 and the boundary subcarrier on the SSB block needs to be considered. Preferably, the target frequency domain position may be the position of SSB subcarrier 0, which is simple to process and is beneficial to reduce the processing load of the device.

The following describes a process in which the terminal acquires reference symbols for demodulating various downlink physical channels from the first reference symbol, in view of a situation that the target frequency domain position is the position of the SSB subcarrier 0:

referring to fig. 3, a manner in which a terminal acquires a reference symbol for demodulating PBCH from a first reference symbol is illustrated.

In the embodiment of the invention, the terminal obtains the second reference symbol with the same bandwidth as the SSB block and is used for demodulating the MIB carried by the PBCH. The SSB block occupies K subcarriers, and K subcarriers are taken from the position of a reference symbol R0 corresponding to the SSB block subcarrier 0, namely R0 and R1 … … Rk-1 are used for demodulating PBCH.

Referring to fig. 4 a-4 e, the manner in which the terminal acquires reference symbols for demodulating PDCCH from the first reference symbols is shown.

Specifically, the PBCH is demodulated according to the acquired second reference symbol, and the configuration Information and subcarrier offset K of the PDCCH related to the first System Information Block (SIB 1) are obtained_SSB(ii) a According to configuration information and K of PDCCH_SSBAnd acquiring a third reference symbol for demodulating the PDCCH from the first reference symbol.

In the examples of the present invention, K_SSBRepresenting data from a common resource block

To subcarrier 0 of the SSB, the subcarrier offset of subcarrier 0 of the SSB

The common resource block number where subcarrier 0 of the first resource block of the SSB is located is indicated.

In some embodiments, the configuration information of the PDCCH includes a first set of indication bits and a second set of indication bits, the first set of indication bits being used for indicating a configuration of a control resource set (CORESET #0), and the second set of indication bits being used for indicating a configuration of a Common Search Space (CSS);

determining the number of resource blocks occupied by CORESET #0 according to the configuration of CORESET #0

And an offset between the CORESET #0 minimum RB index to the minimum common resource block index that overlaps the SSB first resource block;

according to the position of subcarrier 0 of SSB,

offset and K_SSBAnd acquiring a third reference symbol from the first reference symbol.

In the embodiment of the invention, the terminal receives PBCH channel information, after solving MIB information carried by PBCH, the terminal can obtain downlink bandwidth indication and simultaneously can obtain configuration information 'PDCCH-ConfigSIB 1' of PDCCH related to SIB1, SSB and SSB

The subcarrier offset "ssb-subcarrieronoffset" of (a) is: k_SSB，K_SSBIs determined by the parameter "subcarriersspacingmmon" in the MIB.

Optionally, the first group of indication bits is the high-order 4-bit of "PDCCH-ConfigSIB 1" indicating the configuration of CORESET #0, and the first group of indication bits is the low-order 4-bit of "PDCCH-ConfigSIB 1" indicating the configuration of type0-PDCCH common search space CSS.

The PDCCH mapping of the scheduling SIB1 is within the type0-PDCCH common search space. In the frequency domain, Type0-PDCCH common search space is mapped on CORESET #0, and the frequency range (frequency domain position and bandwidth) of CORESET #0 is identical to the initial BWP.

In some embodiments, a relation table among the Type0-PDCCH common search space, CORESET resource blocks and slot symbols can be predefined, and the table is removed according to CORESET #0 information indicated by the high-order 4bit of the PDCCH-ConfigSIB1, so that the number of Resource Blocks (RBs) occupied by CORESET #0 can be obtained

Number of occupied symbols

And controlling an offset between the resource set minimum RB index to the minimum common RB index overlapping the first RB of the SSB, the offset being provided by subcarrierspaceingcommon in units of RBs using a subcarrier spacing of CORESET for Type0-PDCCH common search space.

In some embodiments, the PDCCH monitoring time of the Type0-PDCCH common search space can be predefined, and the blind detection time domain position of the Type-0PDCCH CSS can be obtained by de-table the CSS information indicated by the low 4bit of the "PDCCH-ConfigSIB 1". Bandwidth of CORESET #0 according to the location of SSB block subcarrier 0

Offset of CORESET #0 relative to common resource block of SSB and subcarrier offset K of SSB block_SSBFrequency domain position information corresponding to a third reference symbol required for the PDCCH channel may be obtained.

Specifically, assume that the number of subcarriers of one resource block RB is

According to the difference between the CORESET #0 and SSB resource multiplexing modes, the configuration of CORESET #0 is divided into 3 modes, which respectively correspond to different resource allocation modes:

the first mode is as follows: CORESET #0 and SSB are mapped in a TDM mode, and the two can be overlapped in a frequency domain;

and a second mode: CORESET #0 and SSB are mapped in a TDM mode, and the two are not overlapped in a frequency domain;

and a third mode: CORESET #0 and SSB are mapped in FDM mode, and both have the same time domain resource allocation.

The configuration of the listening time of the search space #0 associated with different CORESET #0 modes is different.

Referring to fig. 4a, the manner in which the third reference symbol is obtained in mode one is shown. Wherein the time domain relative relationship of the reference symbol to the CORESET #0 is merely illustrative and not limiting.

In the embodiment of the invention, the SSB block subcarrier 0 is taken as a boundary, the terminal takes a head reference symbol and a tail reference symbol, the first reference symbol is Ry and Ry +1 … … Rn-1, and the offset of CORESET #0 relative to the common resource block of the SSB and the subcarrier offset K of the SSB block_SSBDetermining the number of subcarriers, and then the format of the first segment of reference symbols is:

the second segment has reference symbols R0, R1 … … Rx, and has bandwidth of CORESET #0

Offset of CORESET #0 relative to common resource block of SSB and subcarrier offset K of SSB block_SSBDetermining that the number of the second segment of reference symbols is:

further, it is possible to obtain:

by passing

And

and acquiring a third reference symbol from the first reference symbol, wherein x and y are indexes of two ends of the third reference symbol in the first reference symbol respectively, and n is the total length of the reference symbol mapping.

The terminal takes n-y reference symbols from the end of the first reference symbol according to the length n-y of the first section of reference symbols, takes x +1 reference symbols from the beginning of the first reference symbol according to the length x +1 of the second section of reference symbols, arranges the two sections of reference symbols in the same order as the receiving, and then can obtain a third reference symbol which is used for processing such as channel estimation, frequency offset, timing estimation and the like.

Referring to fig. 4b and 4c, the manner in which the third reference symbol is obtained in mode two is shown. The method is divided into two cases:

as shown in fig. 4b, CORESET #0 is below the SSB;

in the embodiment of the invention, the subcarrier 0 of the SSB block is taken as a reference point, and the first time is from the tail of a reference symbol

Starting to receive reference symbols

The reference symbols, i.e. from the first reference symbol, Rx +1, …, Ry, in turn, may be:

by passing

And

obtaining a third reference symbol from the first reference symbol, wherein x and y are the third reference symbols respectivelyThe index of both ends of (1) in the first reference symbol, n is the total length of the reference symbol mapping.

The terminal generates a local reference symbol according to the downlink transmission bandwidth, and the terminal receives the reference symbol from the end of the reference symbol

A reference symbol starts to be truncated

The reference symbols serve as the original reference symbol sequence.

As shown in fig. 4c, CORESET #0 is above the SSB;

in the embodiment of the present invention, using subcarrier 0 of the SSB block as a reference point, Rx +1, …, Ry are obtained from the first reference symbol, and then:

by passing

And

A reference symbol starts to be truncated

The reference symbols serve as the original reference symbol sequence.

Referring to fig. 4d and 4e, the manner in which the third reference symbol is obtained in mode three is shown. The method is divided into two cases:

as shown in fig. 4d, CORESET #0 is below the SSB;

in the embodiment of the invention, the sub-carrier 0 of the SSB block is taken as a reference point, and the reception is started from the end of the reference symbol

Reference symbols, derived from the received reference symbols, Rx +1, …, Ry, further resulting in:

y＝n-1；

by passing

And y-n-1, acquiring a third reference symbol from the first reference symbol, wherein x and y are indexes of two ends of the third reference symbol in the first reference symbol respectively, and n is the total length of the reference symbol mapping.

The terminal generates local reference symbols according to the downlink transmission bandwidth, and intercepts the local reference symbols from the end of the reference symbols as the method for receiving the reference symbols

The reference symbols serve as the original reference symbol sequence.

As shown in fig. 4e, CORESET #0 is below the SSB;

A reference symbol fromReceiving the reference symbols, Rx +1, …, Ry, then we can get:

x＝K；

the terminal generates local reference symbols according to the downlink transmission bandwidth, and as the method for receiving the reference symbols, the terminal intercepts the Rk reference symbols from the first reference symbol

One reference symbol is used as the original reference symbol sequence.

Further, the terminal demodulates the PDCCH through a third reference symbol to obtain configuration information of the PDSCH carrying the SIB 1; demodulating PDSCH through a third reference symbol to obtain the position of a common reference point PointA and the position of an initial resource block of a working bandwidth BWP

And number of consecutive resource blocks

In the embodiment of the present invention, the terminal obtains the resource configuration Information of the PDCCH channel of the scheduling SIB1, and performs blind detection on the PDCCH by using a System Information Radio Network Temporary Identity (SI-RNTI), to obtain the resource configuration Information of the PDSCH carrying the SIB1, and the reference symbol corresponding to CORESET #0 may also be used for demodulation of the PDSCH channel of the scheduling SIB1, that is, the PDSCH is demodulated by using the third reference symbol.

Solving the SIB1 information, the terminal can obtain the configuration information about the uplink and downlink common channels, and thus can obtain the location information of the common reference point PointA and the working bandwidth BWP.

The terminal solves the SIB1 information carried by PDSCH, and UE can obtain the relevant configuration information of the uplink and downlink common channels, thereby being capable of obtaining the SIB informationThe offset ToPointA in the SIB information obtains the position of the common reference point PointA, and the position of the starting RB of the BWP can be obtained by the higher layer parameter locationAndBandwidth in the information unit DownlinkConfigCommon in the SIB information

And the number of consecutive RBs

According to the position of the PointA,

And

a fourth reference symbol for BWP is obtained from the first reference symbol.

Referring to fig. 5, a manner in which a terminal acquires a reference symbol for demodulating BWP from a first reference symbol is illustrated.

Suppose a handle K_SSBK after the subcarrier interval configured according to BWP is converted_SSB', let OffsetToPointA namely

After the subcarrier spacing configured according to BWP is converted into

Using sub-carrier 0 of SSB block as reference point, and starting to receive from the end of reference symbol

Rn-1, Rn-2, …. Ry, which is obtained from the received reference symbol, is received from the reference symbol starting position with subcarrier 0 of the SSB block as a reference point

R0, R1, …, Rx, which in turn yields:

by passing

And

and acquiring a fourth reference symbol from the first reference symbol, wherein x 'and y' are indexes of two ends of the fourth reference symbol in the first reference symbol respectively, and n is the total length of the reference symbol mapping.

A reference symbol, truncated from the beginning of the reference symbol

The reference symbols serve as the original reference symbol sequence.

Referring to fig. 6, an embodiment of the present invention provides a network device 600, including:

a mapping module 601, configured to perform cyclic mapping on a first reference symbol in a downlink bandwidth from a target frequency domain position to generate a downlink reference signal;

a first sending module 602, configured to send the downlink reference signal to a terminal;

Further, the network device 600 further includes:

the loop mapping includes:

In the embodiment of the invention, the first reference symbol in the downlink bandwidth is circularly mapped from the target frequency domain position, and through the way of circularly mapping the reference symbol in the full bandwidth, when the working bandwidth is not fixed and the SSB sending position is not fixed, the terminal can accurately obtain the reference symbol for demodulating the physical channel, thereby being beneficial to improving the channel estimation precision and the frequency offset estimation precision.

Referring to fig. 7, an embodiment of the present invention provides a terminal 700, including:

a first receiving module 701, configured to receive a downlink reference signal from a network device;

an obtaining module 702, configured to obtain, according to the downlink reference signal, a reference symbol for demodulating a downlink physical channel from a first reference symbol in a downlink bandwidth according to a cyclic mapping manner starting from a target frequency domain position;

the loop mapping includes:

the terminal 700 further includes:

a second receiving module, configured to receive a master information block MIB through a physical broadcast channel PBCH, and demodulate the PBCH through the second reference symbol to obtain the master information block MIB carried on the PBCH, where the MIB includes a downlink bandwidth indication bit;

Further, the obtaining module 702 is further configured to:

wherein, K is_SSBRepresenting data from a common resource block

Subcarrier 0 of the SSB to subcarrier 0 of the SSB, the

the obtaining module 702 is further configured to:

according to the position of the sub-carrier 0 of the SSB, the

Further, the obtaining module 702 is further configured to:

then pass through

And

obtaining the third reference symbol from the first reference symbol;

then pass through

And

obtaining the third reference symbol from the first reference symbol;

then pass through

And

obtaining the third reference symbol from the first reference symbol;

then pass through

And y-n-1 obtains the third reference symbol from the first reference symbol;

then by x ═ K and

obtaining the first reference symbolA third reference symbol;

for indicating the number of sub-carriers per resource block.

Further, the obtaining module 702 is further configured to:

And number of consecutive resource blocks

According to the position of the PointA,

And

obtaining a fourth reference symbol of the BWP from the first reference symbol.

Further, the obtaining module 702 is further configured to:

by passing

And

from the first referenceObtaining the fourth reference symbol from the symbols;

from the above

And converting the subcarrier spacing configured according to the BWP.

Referring to fig. 8, another network device 800 according to an embodiment of the present invention includes: a processor 801, a transceiver 802, a memory 803, and a bus interface.

Among other things, the processor 801 may be responsible for managing the bus architecture and general processing. The memory 803 may store data used by the processor 801 in performing operations.

In this embodiment of the present invention, the network device 800 may further include: a program stored on the memory 803 and executable on the processor 801, which when executed by the processor 801, performs the steps of the method provided by embodiments of the present invention.

In FIG. 8, the bus architecture may include any number of interconnected buses and bridges, with various circuits, particularly one or more processors represented by the processor 801 and memory represented by the memory 803, linked together. The bus architecture may also link various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further in connection with embodiments of the present invention. The bus interface provides an interface. The transceiver 802 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium.

Referring to fig. 9, another terminal 900 according to an embodiment of the present invention includes: at least one processor 901, memory 902, a user interface 903, and at least one network interface 904. The various components in terminal 900 are coupled together by a bus system 905.

It will be appreciated that bus system 905 is used to enable communications among these components. Bus system 805 includes a power bus, a control bus, and a status signal bus in addition to a data bus. But for clarity of illustration the various buses are labeled in figure 9 as bus system 905.

The user interface 903 may include, among other things, a display, a keyboard, or a pointing device (e.g., a mouse, trackball, touch pad, or touch screen, etc.).

It is to be understood that the memory 902 in embodiments of the present invention may be either volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The non-volatile Memory may be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable PROM (EEPROM), or a flash Memory. The volatile Memory may be a Random Access Memory (RAM), which acts as an external cache Memory. By way of illustration and not limitation, many forms of RAM are available, such as Static random access memory (Static RAM, SRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic random access memory (Synchronous DRAM, SDRAM), Double Data Rate Synchronous Dynamic Random Access Memory (DDRSDRAM), Enhanced Synchronous SDRAM (ESDRAM), Sync Link DRAM (SLDRAM), and Direct Rambus RAM (DRRAM). The memory 802 described in connection with the embodiments of the invention is intended to comprise, without being limited to, these and any other suitable types of memory.

In some embodiments, memory 902 stores the following elements, executable modules or data structures, or a subset thereof, or an expanded set thereof: an operating system 9021 and application programs 9022.

The operating system 9021 includes various system programs, such as a framework layer, a core library layer, a driver layer, and the like, and is configured to implement various basic services and process hardware-based tasks. The application 9022 includes various applications, such as a media player, a browser, and the like, for implementing various application services. A program implementing the method of an embodiment of the present invention may be included in application 9022.

In this embodiment of the present invention, the terminal 900 may further include: a program stored on the memory 902 and executable on the processor 901, which when executed by the processor 901 performs the steps of the method provided by the embodiments of the present invention.

The method disclosed in the above embodiments of the present invention may be applied to the processor 901, or implemented by the processor 901. The processor 901 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be implemented by integrated logic circuits of hardware in the processor 901 or by instructions in the form of software. The Processor 901 may be a general-purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, a discrete Gate or transistor logic device, or a discrete hardware component. The various methods, steps, and logic blocks disclosed in the embodiments of the present invention may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software modules may be located in computer readable storage media as is well known in the art, such as ram, flash memory, rom, prom, eprom, or eeprom, registers, etc. The computer readable storage medium is located in the memory 902, and the processor 901 reads the information in the memory 902, and completes the steps of the above method in combination with the hardware thereof. Specifically, the computer-readable storage medium has stored thereon a computer program.

It is to be understood that the embodiments described herein may be implemented in hardware, software, firmware, middleware, microcode, or any combination thereof. For a hardware implementation, the processing units may be implemented within one or more ASICs, DSPs, Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), FPGAs, general purpose processors, controllers, micro-controllers, microprocessors, other electronic units designed to perform the functions described herein, or a combination thereof.

The embodiment of the present invention further provides a processor-readable storage medium, where a program is stored on the processor-readable storage medium, and when the program is executed by a processor, the program implements the processes of the foregoing method embodiments, and can achieve the same technical effects, and details are not described here to avoid repetition. The computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The above description is only an embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions within the technical scope of the present disclosure should be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A transmission method of reference signals is applied to network equipment, and is characterized in that the method comprises the following steps:

circularly mapping the first reference symbol in a downlink bandwidth from a target frequency domain position to generate a downlink reference signal;

sending the downlink reference signal to a terminal;

wherein the target frequency domain position is relatively fixed with respect to the frequency domain position of the synchronization signal block SSB.

2. The method of claim 1, further comprising:

3. The method of claim 1,

the target frequency domain position is a frequency domain position having a fixed offset from the frequency domain position of subcarrier 0 of the SSB;

the loop mapping includes:

4. A transmission method of reference signals is applied to a terminal, and is characterized in that the method comprises the following steps:

receiving a downlink reference signal from a network device;

5. The method of claim 4,

the loop mapping includes:

6. The method of claim 5, further comprising:

when the subcarrier number of the target frequency domain position is larger than the length of the SSB subcarrier 0 plus the SSB subcarrier, K subcarriers are selected from the target frequency domain position minus OFFSET _ R according to the subcarrier number increasing direction, and a second reference symbol for demodulating PBCH is obtained from the first reference symbol through the K subcarriers;

7. The method of claim 6, wherein the target frequency domain position is a position of SSB subcarrier 0;

demodulating the PBCH through the second reference symbol to obtain a Master Information Block (MIB) carried on the PBCH, wherein the MIB comprises a downlink bandwidth indication bit;

8. The method of claim 7,

according to a cyclic mapping mode, acquiring a reference symbol for demodulating a downlink physical channel from a first reference symbol in a downlink bandwidth, comprising:

According to the configuration information of the PDCCH and the K_SSBAcquiring a third reference symbol for demodulating the PDCCH from the first reference symbolA reference symbol;

wherein, K is_SSBRepresenting data from a common resource block

Subcarrier 0 of the SSB to subcarrier 0 of the SSB, the

9. The method of claim 8,

the configuration information of the PDCCH comprises a first group of indication bits and a second group of indication bits, wherein the first group of indication bits are used for indicating the configuration of a control resource set CORESET #0, and the second group of indication bits are used for indicating the configuration of a common search space CSS;

according to the position of the sub-carrier 0 of the SSB, the

10. The method of claim 9, wherein the position of subcarrier 0 according to the SSB, and the like

then pass through

And

obtaining the third reference symbol from the first reference symbol;

then pass through

And

obtaining the third reference symbol from the first reference symbol;

then pass through

And

obtaining the third reference symbol from the first reference symbol;

then pass through

And y-n-1 obtains the third reference symbol from the first reference symbol;

then by x ═ K and

obtaining the third reference symbol from the first reference symbol;

for indicating the number of sub-carriers per resource block.

11. The method of claim 9, wherein the obtaining reference symbols for demodulating downlink physical channels from first reference symbols in a downlink bandwidth according to a cyclic mapping manner further comprises:

demodulating the PDSCH through the third reference symbol to obtainThe position of the common reference point PointA, the position of the starting resource block of the working bandwidth BWP

And number of consecutive resource blocks

According to the position of the PointA,

And

acquiring a fourth reference symbol of the BWP from the first reference symbol.

12. The method of claim 11, wherein the position of the PointA is determined according to the position of the PointA,

And

obtaining a fourth reference symbol of the BWP from the first reference symbol, comprising:

by passing

And

obtaining the fourth reference symbol from the first reference symbol;

wherein x 'and y' are respectively the ropes of the two ends of the fourth reference symbol in the first reference symbolLeading the raw materials to a reaction kettle,

from the above

And converting the subcarrier spacing configured according to the BWP.

13. A network device, comprising:

14. A terminal, comprising:

15. A network device comprising a processor, a memory, and a program stored on the memory and executable on the processor, the program, when executed by the processor, implementing the operations of the reference signal transmission method according to any one of claims 1 to 3.

16. A terminal comprising a processor, a memory, and a program stored on the memory and executable on the processor, the program, when executed by the processor, implementing the operations of the reference signal transmission method according to any one of claims 4 to 12.

17. A processor-readable storage medium, on which a program is stored, which when executed by a processor, implements the operations of the reference signal transmission method according to any one of claims 1 to 3 or the operations of the reference signal transmission method according to any one of claims 4 to 12.