CN112399593B

CN112399593B - Data transmission method and device

Info

Publication number: CN112399593B
Application number: CN201910760922.5A
Authority: CN
Inventors: 吴霁; 张佳胤; 黄甦
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2019-08-16
Filing date: 2019-08-16
Publication date: 2022-06-14
Anticipated expiration: 2039-08-16
Also published as: CN112399593A

Abstract

The application provides a method and a device for data transmission, which can realize PDSCH mapping when a PDSCH collides with an SSB on a transmitted time-frequency resource, and can avoid wasting the time-frequency resource not occupied by the SSB on a time-domain symbol where the SSB is located, thereby improving the transmission efficiency of the time-frequency resource. The data transmission method comprises the following steps: the method comprises the steps that terminal equipment receives first indication information sent by network equipment, wherein the first indication information is used for indicating time domain resources of a Physical Downlink Shared Channel (PDSCH), and the time domain resources transmitted by the PDSCH are overlapped with the time domain resources transmitted by a Synchronous Signal Block (SSB). And the terminal equipment demodulates the PDSCH according to a demodulation reference signal (DMRS) in the PDSCH.

Description

Data transmission method and device

Technical Field

The present application relates to the field of communications, and more particularly, to a method and apparatus for data transmission.

Background

The New Radio (NR) standard defines a synchronization pulse sequence set (SS burst set), which is mainly used for the processes of initial intervention, system message update or beam (beam) management of a terminal device. Each SS burst set may have a duration of 5ms and a period of 5/10/20/40/80/100 ms. As shown in fig. 1, the SS burst set is composed of several Synchronization Signal Blocks (SSBs). When the carrier frequency is less than 6GHz, each SS burst set contains 8 SSBs at most, and when the carrier frequency is greater than 6GHz, each SS burst set contains 64 SSBs at most.

Each SSB has 4 Orthogonal Frequency Division Multiplexing (OFDM) symbols (symbol) and sequentially corresponds to a Primary Synchronization Signal (PSS), a physical broadcast signal (PBCH), a Secondary Synchronization Signal (SSS), and a PBCH. In addition, each SSB may correspond to a different beam direction.

In the initial access phase, the terminal device may obtain a time-frequency resource position of a remaining system information control information resource set (RMSI core) corresponding to the SSB by detecting the SSB sent by the network device and analyzing configuration information in the PBCH, and then read the RMSI core information to obtain a Physical Downlink Shared Channel (PDSCH), thereby obtaining configuration information of a physical random access control channel (PRACH) resource for subsequent random access.

In a communication system, the RMSI core may be transmitted in a slot (slot) with the SSB, and RMSI PDSCH may collide with the SSB on the time-frequency resource for transmission (collision), and how to perform PDSCH mapping at this time is an urgent problem to be solved.

Disclosure of Invention

The application provides a method and a device for data transmission, which can realize PDSCH mapping when a PDSCH collides with an SSB on a transmitted time-frequency resource, and can avoid wasting the time-frequency resource not occupied by the SSB on a time-domain symbol where the SSB is located, thereby improving the transmission efficiency of the time-frequency resource.

In a first aspect, a method for data transmission is provided, including:

the method comprises the steps that terminal equipment receives first indication information sent by network equipment, wherein the first indication information is used for indicating time domain resources of a Physical Downlink Shared Channel (PDSCH), and the time domain resources transmitted by the PDSCH are overlapped with the time domain resources transmitted by a Synchronous Signal Block (SSB).

And the terminal equipment demodulates the PDSCH according to a demodulation reference signal (DMRS) in the PDSCH, wherein the time domain resource of the DMRS is not overlapped with the time domain resource of the SSB, or the time domain resource of the DMRS is overlapped with the time domain resource of the SSB and the frequency domain resource of the DMRS is not overlapped with the frequency domain resource of the SSB.

Therefore, in the embodiment of the present application, the time domain resource of the PDSCH is indicated by sending the first indication information to the terminal device, and when the PDSCH corresponding to the CORESET is transmitted in the time slot in which the SSB is located, the PDSCH corresponding to the CORESET can be transmitted in the unoccupied bandwidth of the symbol in which the SSB is located.

With reference to the first aspect, in certain implementations of the first aspect, the method further includes:

receiving second indication information sent by a network device, where the second indication information is used to indicate frequency domain resources of the PDSCH, and the frequency domain resources of the PDSCH and the frequency domain resources of the SSB do not overlap.

Therefore, in this embodiment of the application, the network device may indicate, to the terminal device, the spectrum resource actually occupied by the PDSCH through the second indication information, and the partial spectrum resource is not overlapped with the frequency domain resource of the SSB.

In a second aspect, a method for data transmission is provided, including:

the network equipment determines first indication information, wherein the first indication information is used for indicating time-frequency resources of a Physical Downlink Shared Channel (PDSCH), time-domain resources transmitted by the PDSCH are overlapped with time-domain resources transmitted by a Synchronous Signal Block (SSB), time-domain resources of a demodulation reference signal (DMRS) in the PDSCH are not overlapped with the time-domain resources of the SSB, or the time-domain resources of the DMRS are overlapped with the time-domain resources of the SSB and the frequency-domain resources of the DMRS are not overlapped with the frequency-domain resources of the SSB;

and the network equipment sends the first indication information to terminal equipment.

With reference to the second aspect, in some implementations of the second aspect, the method further includes:

and sending second indication information to a terminal device, wherein the second indication information is used for indicating the frequency domain resources of the PDSCH, and the frequency domain resources of the PDSCH are not overlapped with the frequency domain resources of the SSB.

In a third aspect, an apparatus is provided, which may be a terminal device or a chip in the terminal device. The apparatus has the functionality to implement the first aspect and various possible implementations described above. The function can be realized by hardware, and can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the functions described above.

In one possible design, the apparatus includes: the apparatus further comprises a transceiver module, which may be at least one of a transceiver, a receiver, a transmitter, for example, and optionally a processing module, which may include a radio frequency circuit or an antenna. The processing module may be a processor. Optionally, the apparatus further comprises a storage module, which may be a memory, for example. When included, the memory module is used to store instructions. The processing module is connected with the storage module, and the processing module can execute the instructions stored by the storage module or other instructions from other sources so as to cause the device to execute the method of any one of the aspects.

In another possible design, when the device is a chip, the chip includes: the chip also includes a processing module, and the transceiver module may be, for example, an input/output interface, a pin, a circuit, or the like on the chip. The processing module may be, for example, a processor. The processing module may execute instructions to cause a chip within the terminal to perform the communication method of the first aspect and any possible implementation. Alternatively, the processing module may execute instructions in a memory module, which may be an on-chip memory module, such as a register, a cache, and the like. The memory module may also be located within the communication device, but outside the chip, such as a read-only memory (ROM) or other types of static memory devices that may store static information and instructions, a Random Access Memory (RAM), and so on.

The receiving and sending module is configured to receive first indication information, where the first indication information is used to indicate time domain resources of a physical downlink shared channel PDSCH, and the time domain resources transmitted by the PDSCH are overlapped with the time domain resources transmitted by a synchronization signal block SSB.

The processing module is configured to demodulate the PDSCH according to a demodulation reference signal DMRS in the PDSCH, where time-domain resources of the DMRS do not overlap with time-domain resources of the SSB, or the time-domain resources of the DMRS overlap with the time-domain resources of the SSB and the frequency-domain resources of the DMRS do not overlap with the frequency-domain resources of the SSB.

The optional processing module is further configured to acquire the time domain resource of the DMRS according to a control information resource set, CORESET, corresponding to the PDSCH, where the time domain resource of the CORESET and the time domain resource of the DMRS have a corresponding relationship.

Optionally, the transceiver module is further configured to receive second indication information, where the second indication information is used to indicate frequency domain resources of the PDSCH, and the frequency domain resources of the PDSCH and the frequency domain resources of the SSB are not overlapped.

The processor mentioned in any of the above may be a general-purpose Central Processing Unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits for controlling the execution of programs of the communication methods in the above aspects.

In a fourth aspect, an apparatus is provided, which may be a network device or a chip within the network device. The apparatus has the functionality to implement the second aspect and various possible implementations described above. The function can be realized by hardware, and can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the functions described above.

In one possible design, the apparatus includes: the apparatus further comprises a transceiver module, which may be at least one of a transceiver, a receiver, a transmitter, for example, and optionally a processing module, which may include a radio frequency circuit or an antenna. The processing module may be a processor. Optionally, the apparatus further comprises a storage module, which may be a memory, for example. When included, the memory module is used to store instructions. The processing module is connected with the storage module, and the processing module can execute the instructions stored in the storage module or other instructions from other sources, so as to enable the apparatus to execute the communication method of the first aspect and various possible implementations.

In another possible design, when the device is a chip, the chip includes: the transceiver module, which may be, for example, an input/output interface, a pin, a circuit, or the like on the chip, optionally further comprises a processing module. The processing module may be, for example, a processor. The processing module may execute instructions to cause a chip within the terminal to perform the method of the second aspect and any possible implementation. Alternatively, the processing module may execute instructions in a memory module, which may be an on-chip memory module, such as a register, a cache, and the like. The memory module may also be located within the communication device, but outside the chip, such as a read-only memory (ROM) or other types of static memory devices that may store static information and instructions, a Random Access Memory (RAM), and so on.

The processor mentioned in any of the above may be a general purpose Central Processing Unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits for controlling program execution of the communication method of the first aspect.

A processing module, configured to determine first indication information, where the first indication information is used to indicate time-frequency resources of a PDSCH (physical downlink shared channel), where time-domain resources transmitted by the PDSCH overlap time-domain resources transmitted by an SSB (synchronization signal block), time-domain resources of a DMRS (demodulation reference signal) in the PDSCH do not overlap time-domain resources of the SSB, or time-domain resources of the DMRS overlap time-domain resources of the SSB and frequency-domain resources of the DMRS do not overlap frequency-domain resources of the SSB;

and the transceiver module is used for sending the first indication information to the terminal equipment.

Optionally, the transceiver module is further configured to send second indication information, where the second indication information is used to indicate frequency domain resources of the PDSCH, and the frequency domain resources of the PDSCH are not overlapped with the frequency domain resources of the SSB.

With reference to the first aspect, the second aspect, the third aspect, or the fourth aspect, in certain implementations of the first aspect, the second aspect, the third aspect, or the fourth aspect, the first indication information is further used for indicating time domain resources of the DMRS. In this way, the terminal device may obtain the time domain resource of the DMSR according to the indication of the network device, and may further demodulate the PDSCH according to the DMRS.

With reference to the first aspect, the second aspect, the third aspect, or the fourth aspect, in certain implementations of the first aspect, the second aspect, the third aspect, or the fourth aspect, a correspondence relationship is provided between time domain resources of the CORESET and time domain resources of the DMRS. In this way, the network device may implicitly indicate the time domain resource of the DMRS to the terminal device through the configuration information of the time domain resource of the CORESET. The terminal device may obtain the time domain resource of the DMSR according to the time domain resource of the CORESET and/or the first indication information, and may further demodulate the PDSCH according to the DMRS.

In a possible implementation manner, the number of symbols of the CORESET may have a corresponding relationship with the time domain resource of the DMRS.

With reference to the first aspect, the second aspect, the third aspect, or the fourth aspect, in certain implementations of the first aspect, the second aspect, the third aspect, or the fourth aspect, the symbol index of the DMRS is at least one of the following sets: {1,2,3,4,6,7,8,9,10,11,12,13}. In some possible cases, when the time domain symbol where the PDSCH is located and the time domain where the SSB is located are all overlapped, that is, when the PDSCH and the SSB are frequency division multiplexed, the DMRS is also frequency division multiplexed with the SSB at this time; when there is a partial symbol in the PDSCH that is not frequency-division multiplexed with the SSB, the DMRS may be frequency-division multiplexed with the SSB or not.

With reference to the first aspect, the second aspect, the third aspect, or the fourth aspect, in certain implementations of the first aspect, the second aspect, the third aspect, or the fourth aspect, the first indication information is used to indicate a number of persistent symbols of the PDSCH, where the number of persistent symbols is one of the following sets: {4,5,6,8,9,11,12,13,14}.

With reference to the first aspect, the second aspect, the third aspect, or the fourth aspect, in certain implementations of the first aspect, the second aspect, the third aspect, or the fourth aspect, the first indication information is used to indicate a start position of a time domain symbol of the PDSCH and a symbol offset value of a symbol where a core set corresponding to the PDSCH is located.

Therefore, in the embodiment of the present application, by using the time domain symbol of the PDSCH relative to the symbol where the corresponding CORESET is located as the symbol offset value to indicate the starting symbol position of the PDSCH, it is possible to use one offset value to indicate at least two different starting time domain positions of the PDSCH, so that the indication overhead can be reduced, and the signaling overhead of the system is further reduced.

With reference to the first aspect, the second aspect, the third aspect, or the fourth aspect, in some implementations of the first aspect, the symbol offset value is one of the following sets: {1,2}.

With reference to the first aspect, the second aspect, the third aspect, or the fourth aspect, in some implementations of the first aspect, the second aspect, the third aspect, or the fourth aspect, the first indication information is further used to indicate a mapping type of the PDSCH, wherein, when the mapping type is type B, the number of persistent symbols is at least one of the following set: {4,5,6,8,9,11,12,13,14}. Alternatively, in other possible implementations, when the number of persistent symbols is any one of the set {5,6,8,9,11,12,13,14}, the mapping type may also be referred to as type C.

With reference to the first aspect, the second aspect, the third aspect, or the fourth aspect, in certain implementations of the first aspect, the second aspect, the third aspect, or the fourth aspect, when the time domain resources of the DMRS overlap with the time domain resources of the SSB and the frequency domain resources of the DMRS do not overlap with the frequency domain resources of the SSB, the frequency domain resources of the PDSCH occupy the entire bandwidth of the symbol on which the PDSCH is located.

For the terminal device, the PSS or SSS is a known sequence, so the terminal device can demodulate the PDSCH occupying the entire bandwidth of the symbol according to the DMRS and the PSS or SSS frequency-division multiplexed with the DMRS, and thus the transmission efficiency of the time-frequency resources of the network device and the terminal device can be improved.

With reference to the first aspect, the second aspect, the third aspect, or the fourth aspect, in certain implementations of the first aspect, the second aspect, the third aspect, or the fourth aspect, at least one of the information such as the time domain resource of the PDSCH, the time domain resource of the DMRS, the number of persistent symbols of the PDSCH, the symbol offset value, and the mapping type of the PDSCH may be further predefined by a protocol. When at least one of the above information is defined by a protocol, the first indication information may not need to indicate the information. When all of the above information is defined by a protocol, the network device may not need to transmit the first indication information to the terminal device.

In a fifth aspect, a computer storage medium is provided, in which a program code is stored, the program code being used for instructing to execute instructions of the method of the first or second aspect or any possible implementation manner thereof.

A sixth aspect provides a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of the first or second aspect described above or any possible implementation thereof.

In a seventh aspect, a communication system is provided, which comprises an apparatus having functions to implement the methods and various possible designs of the first aspect and an apparatus having functions to implement the methods and various possible designs of the second aspect.

In an eighth aspect, a processor is provided, coupled to a memory, for performing the method of the first or second aspect or any possible implementation manner thereof.

In a ninth aspect, there is provided a chip comprising a processor and a communication interface for communicating with an external device or an internal device, the processor being configured to implement the method of the first or second aspect or any possible implementation thereof.

Optionally, the chip may further include a memory having instructions stored therein, and the processor may be configured to execute the instructions stored in the memory or derived from other instructions. When executed, the instructions are for implementing a method in the first or second aspect described above, or any possible implementation thereof.

Alternatively, the chip may be integrated on a terminal device or a network device.

Drawings

Fig. 1 shows a schematic diagram of a set of synchronization pulse sequences.

Fig. 2 shows a schematic diagram of a communication system suitable for use in the present application.

Fig. 3 shows an example of a time domain relationship between the SSB pattern and its corresponding CORESET #0 in the embodiment of the present application.

Fig. 4 shows another example of the time domain relationship between the SSB pattern and its corresponding CORESET #0 in the embodiment of the present application.

Fig. 5 shows another example of the time domain relationship between the SSB pattern and its corresponding CORESET #0 in the embodiment of the present application.

Fig. 6 is a schematic flow chart of a method for data transmission according to an embodiment of the present application.

Fig. 7A shows an example of the time domain relationship of the SSB pattern, core set #0, and PDSCH in the embodiment of the present application.

Fig. 7B shows another example of the time domain relationship of the SSB pattern, core set #0, and PDSCH in the embodiment of the present application.

Fig. 8A shows another example of the time domain relationship of the SSB pattern, CORESET #0, and PDSCH in the embodiment of the present application.

Fig. 8B shows another example of the time domain relationship of the SSB pattern, CORESET #0, and PDSCH in the embodiment of the present application.

Fig. 9A shows another example of the time domain relationship of the SSB pattern, CORESET #0, and PDSCH in the embodiment of the present application.

Fig. 9B shows another example of the time domain relationship of the SSB pattern, CORESET #0, and PDSCH in the embodiment of the present application.

Fig. 10 shows a schematic block diagram of a communication device according to an embodiment of the present application.

Fig. 11 shows a schematic block diagram of another communication apparatus provided in an embodiment of the present application.

Fig. 12 shows a schematic block diagram of another communication device provided in an embodiment of the present application.

Fig. 13 shows a schematic block diagram of another communication device provided in an embodiment of the present application.

Detailed Description

The technical solution in the present application will be described below with reference to the accompanying drawings.

The technical scheme of the embodiment of the application can be applied to various communication systems, for example: a global system for mobile communication (GSM) system, a Code Division Multiple Access (CDMA) system, a Wideband Code Division Multiple Access (WCDMA) system, a General Packet Radio Service (GPRS), a long term evolution (long term evolution, LTE) system, a LTE Frequency Division Duplex (FDD) system, a LTE Time Division Duplex (TDD) system, a universal mobile telecommunications system (universal mobile telecommunications system, UMTS), a Worldwide Interoperability for Microwave Access (WiMAX) communication system, a future fifth generation (5G) system, or a new radio NR (UMTS) system, etc.

As an example, the communication system may be an NR in Unlicensed Spectrum (NR-U) system, or other Unlicensed communication systems.

Generally, conventional communication systems support a limited number of connections and are easy to implement, however, with the development of communication technology, mobile communication systems will support not only conventional communication but also, for example, device-to-device (D2D) communication, machine-to-machine (M2M) communication, Machine Type Communication (MTC), and vehicle-to-vehicle (V2V) communication.

First, an application scenario of the present application is introduced, and fig. 2 is a schematic diagram of a communication system suitable for the present application.

The communication system includes network device 110, terminal device 120, terminal device 130, terminal device 140, terminal device 150, terminal device 160, and terminal device 170, which communicate with network device 110 through a wireless link. By way of example, communication with network device 110 may be via electromagnetic waves.

In fig. 2, the network device 110 may send signaling and/or data to one or more of the above 6 terminal devices. The terminal device 150, the terminal device 160, and the terminal device 170 may also form a communication system, in which the terminal device 160 may send signaling and/or data to one or both of the terminal device 150 and the terminal device 170, that is, the embodiment of the present application may be applied to communication between not only the terminal device and the network device, but also between the terminal device and the terminal device.

It should be noted that a plurality of terminal devices are shown in the embodiment of the present application to better and more fully describe the embodiment of the present application, but should not limit the embodiment of the present application at all, and in practical applications, only one or more terminal devices may exist.

In this application, the plurality of terminal devices may refer to a user device, an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a user terminal, a wireless communication device, a user agent, or a user equipment. The terminal device may also be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with wireless communication function, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a future 5G network or a terminal device in a future evolved Public Land Mobile Network (PLMN), and the like, which are not limited in this embodiment.

The network device 110 may be a base station defined by 3GPP, e.g., a base station in a 5G communication system (gNB). The network device 110 may also be an access network device, such as an Access Gateway (AGW), that is not 3GPP (non-3 GPP). Network device 110 may also be a relay station, an access point, a vehicle device, a wearable device, and other types of devices.

The communication system 100 is only an example, and a communication system to which the present application is applied is not limited thereto, and for example, the number of network devices and terminal devices included in the communication system 100 may be other numbers.

The wireless communication system may support two types of PDSCH scheduling, type a and type b. Table 1 below shows a specific mapping manner of type a and type B.

TABLE 1

Wherein, S represents a symbol offset between a starting position of the PDSCH and a slot boundary where the PDSCH is located, and L represents a number of persistent symbols of the PDSCH.

As shown in table 1, for the PDSCH scheduling of type a, the PDSCH can only be transmitted from the 1 st to the 4 th symbols (i.e., symbols 0-3). It should be noted that the value of S can be 3 only when the position of the DMRS is at symbol 3. The number of persistent symbols of the PDSCH may be 3-14 symbols for a normal (normal) Cyclic Prefix (CP) length and 3-12 symbols for a long (extended) CP length.

In addition, for the PDSCH scheduling scheme of type a, the corresponding demodulation reference signal (DMRS) can only be located in the 3 rd symbol (i.e., symbol 2) or the 4 th symbol (i.e., symbol 3) within one slot.

For the PDSCH scheduling of type B, the PDSCH can only be transmitted from the 1 st to 13 th symbols (i.e., symbols 0 to 12) with a normal CP length, and the number of persistent symbols of the PDSCH may be 2/4/7 symbols. For long CP length, PDSCH can only be transmitted from 1 st to 11 th symbols (i.e., symbols 0-10), and the number of persistent symbols of PDSCH can be 2/4/6 symbols.

In addition, for the PDSCH scheduling scheme of type B, the corresponding DMRS can only be located in the 1 st symbol (i.e., symbol 0) within one slot. It should be noted that when the 1 st or first several symbols in a slot are occupied by CORESET, the DMRS position may be carried forward to the first possible symbol.

According to 3GPP present standard discussion advances, an NR-U communication system may support one of the following two SSB patterns (patterns) and support 1-symbol or 2-symbol RMSI CORESET (CORESET #0/type 0-PDCCH). Both SSB patterns support a type0 Physical Downlink Control Channel (PDCCH), i.e., type 0-PDCCH.

The first SSB pattern may also be an old SSB position in a slot.

The type0-PDCCH corresponding to the first SSB in one slot transmits coreset 0 of 2 symbol lengths at symbol 0(symbol #0) and symbol 1(symbol #1), or transmits coreset 0 of 1 symbol length at symbol # 0.

The type0-PDCCH corresponding to the second SSB in one slot transmits coreset 0 of 2 symbol length at symbol 6(symbol #6) and symbol 7(symbol #7), or transmits coreset 0 of 1 symbol length at symbol # 7.

The second SSB pattern may also be a new SSB position in a slot.

The type0-PDCCH corresponding to the second SSB in one slot transmits coreset 0 of 2 symbol length at symbol 7(symbol #7) and symbol 8(symbol #8), or transmits coreset 0 of 1 symbol length at symbol # 7.

Fig. 3 to 5 show some possible examples of the time domain relationship of the SSB pattern and its corresponding CORESET #0 in the NR-U communication system.

An example of the first SSB pattern is shown in fig. 3. Specifically, as shown in fig. 3, 2 SSBs may be included in 1 slot. The symbols occupied by the first SSB in the time domain are symbols 2-5, and the RMSI CORESET corresponding to the SSB is symbol 0. The second SSB occupies the symbols 9-12 in the time domain, and the corresponding RMSI CORESET of the SSB is at symbol 7.

An example of a second SSB pattern is shown in fig. 4. Specifically, as shown in fig. 4, 2 SSBs may be included in 1 slot. The symbols occupied by the first SSB in the time domain are symbols 2-5, and the RMSI CORESET corresponding to the SSB is symbol 0and symbol 1. The symbols occupied by the second SSB in the time domain are symbols 9-12, and the RMSI CORESET corresponding to this SSB is symbols 7and 8.

An example of a second SSB pattern is shown in fig. 5. Specifically, as shown in fig. 5, 2 SSBs may be included in 1 slot. The symbols occupied by the first SSB in the time domain are symbols 2-5, and the RMSI CORESET corresponding to the SSB is symbol 0. The second SSB occupies symbols 8-11 in the time domain, and the corresponding RMSI CORESET of the SSB is at symbol 6.

As can be seen from the above definition of SSB pattern, no matter whether the duration of the RMSI CORESET is 1 symbol or 2 symbols, the first SSB and the second SSB within 1 slot have the same structure, or the RMSI CORESET corresponding to the first SSB and the RMSI CORESET corresponding to the second SSB have the same structure.

It should be noted that fig. 3 to fig. 5 illustrate some possible cases of the time domain relationship between the SSB pattern and its corresponding CORESET #0, but the embodiments of the present application are not limited thereto. The time domain relationship between the SSB pattern and the CORESET #0 corresponding thereto may also be other situations besides fig. 3 to fig. 5, which is not limited in this embodiment of the application.

In the embodiment of the present application, when there is an SSB transmission in a time slot where a PDSCH corresponding to an RMSI core set is located, because the SSB does not occupy the entire bandwidth of the located symbol, in order to avoid wasting the unoccupied time-frequency resource, RMSI PDSCH corresponding to the RMSI core set may be transmitted on the unoccupied bandwidth of the symbol where the SSB is located. At this time, the PDSCH scheduling scheme in the NR system described above is no longer applicable since it does not consider the SSBs transmitted in the slots. In view of this, the present application provides a data transmission method, which can perform RMSI PDSCH mapping when RMSI PDSCH and SSB collide (collision) on a transmitted time-frequency resource.

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

It should be understood that in the embodiments shown below, the first, second and various numerical numbers are only used for convenience of description and are not used to limit the scope of the embodiments of the present application. For example, different indication information is distinguished.

It should also be understood that in the embodiments shown below, "predefined" may be implemented by saving corresponding codes, tables or other manners that may be used to indicate related information in advance in the devices (for example, including the terminal device and the network device), and the present application is not limited to the specific implementation manner thereof.

It should also be understood that references to "storing" in embodiments of the present application may refer to storing in one or more memories. The one or more memories may be provided separately or integrated in the encoder or decoder, the processor, or the communication device. The one or more memories may also be provided separately, with a portion of the one or more memories being integrated into the decoder, the processor, or the communication device. The type of memory may be any form of storage medium and is not intended to be limiting of the present application.

It should also be understood that the "protocol" in the embodiment of the present application may refer to a standard protocol in the communication field, for example, the standard protocol may include an LTE protocol, an NR protocol, and related protocols applied in future communication systems, which is not limited in the present application.

Hereinafter, without loss of generality, the embodiments of the present application will be described in detail by taking a data transmission process of a terminal device as an example. It is understood that any terminal device or chip configured in the terminal device in the wireless communication system may perform data transmission based on the same method, and any network device or chip configured in the network device in the wireless communication system may perform data transmission based on the same method. This is not limited in this application.

Fig. 6 is a schematic flow chart diagram of a method 600 of data transfer shown from the perspective of device interaction. As shown in fig. 6, the method 600 may include steps 601-607. The various steps in method 600 are described in detail below in conjunction with fig. 6.

The network device determines 610 first indication information. The first indication information is used for time domain resources of a Physical Downlink Shared Channel (PDSCH), wherein the time domain resources transmitted by the PDSCH are overlapped with the time domain resources transmitted by a Synchronous Signal Block (SSB).

As an example, when there is SSB transmission in the slot corresponding to RMSI PDSCH in the RMSI CORESET, there may be simultaneous SSB transmission on at least part of the time domain symbols in consecutive time domain symbols occupied by RMSI PDSCH. On RMSI PDSCH time domain symbols overlapping with the SSBs, RMSI PDSCH transmits on Resource Blocks (RBs) on these time domain symbols where no SSBs are transmitted, i.e., RMSI PDSCH frequency division multiplexes with the SSBs.

Therefore, RMSI PDSCH corresponding to the RMSI CORESET is transmitted on the RB that does not transmit the SSB on the time domain symbol occupied by the SSB, which can avoid wasting the unoccupied time-frequency resource, thereby improving the transmission efficiency of the time-frequency resource.

It should be noted that, in the embodiment of the present application, RMSI PDSCH corresponding to RMSI CORESET is taken as an example for description, but the embodiment of the present application is not limited to this, and for example, for other types of PDSCHs, when time domain resources for transmission thereof overlap time domain resources for SSB transmission, the scheme for performing PDSCH mapping provided in the embodiment of the present application is also applicable. In addition, in the embodiments of the present application, if not specifically stated, the described CORESET refers to RMSI CORESET #0, and the described PDSCH refers to RMSI PDSCH corresponding to RMSI CORESET # 0.

In other implementations, the time domain resources of the PDSCH may be predefined by a protocol. For example, the protocol may define a relative position relationship between the time domain resources of the PDSCH and the time domain resources of the SSB or the CORESET, but the embodiment of the present application is not limited thereto. At this time, the network device may not be required to indicate to the terminal device, i.e., steps 610 and 620 may not be required to be performed.

In the embodiment of the present application, the PDSCH occupies consecutive time domain symbols. Optionally, the first indication information may also be used to indicate a number of persistent symbols of the PDSCH. In the embodiment of the present application, the number of persistent symbols of the PDSCH may be represented by symbol "L".

In some possible implementations, the PDSCH may be transmitted on all RBs on the time domain symbol where the SSB is located that are not occupied by the SSB. For this case, the value of L is greater than or equal to the number of time domain symbols occupied by SSB and less than 1 slot length, that is, L is a positive integer greater than or equal to 4 and less than or equal to 14.

One or more symbols in the PDSCH transmit DMRS used to demodulate the PDSCH. In some possible implementations, when a time domain symbol occupied by the DMRS does not overlap with the SSB, the DMRS may be transmitted over the entire bandwidth of one time domain symbol. When there is SSB transmission in a time domain symbol occupied by the DMRS, the DMRS may be transmitted on an RB on the time domain symbol where no SSB is transmitted, that is, the DMRS is frequency division multiplexed with the SSB.

Optionally, the symbol index of the DMRS is at least one of the following sets: {1,2,3,4,6,7,8,9,10,11,12,13}.

In some possible implementations, the number of symbols occupied by the DMRS may have a corresponding relationship with a time domain resource location occupied by the DMRS. As an example, the corresponding relationship may be obtained in advance, or defined by a protocol, or indicated to the terminal device by the network device each time the PDSCH time domain resource is indicated, which is not limited in this embodiment of the application.

As an example, when 1 DMRS symbol is configured, it may appear on a time domain symbol where the SSB is located, i.e., frequency division multiplexed with the SSB. When 2 DMRS symbols are configured, 1 DMRS symbol may appear on one of the time domain symbols where the SSB is located, frequency division multiplexing with the SSB, and another DMRS may appear on the time domain symbol not occupied by the SSB. Or, when 2 DMRS symbols are configured, the 2 DMRSs may all appear on a time domain symbol where the SSB is located, that is, all frequency division multiplexed with the SSB. Here, the specific symbol position may be defined by a protocol, or the network device may indicate to the terminal device in a semi-static manner, which is not limited in this embodiment of the application. The above is merely an example, and the embodiments of the present application are not limited thereto.

In some possible implementations, the DMRS may occupy a time domain symbol in a middle position in the time domain symbol where the PDSCH corresponding to the DMRS is located, which may help to demodulate the PDSCH better. As one example, when the PDSCH occupies symbols 2-6, the DMRS may occupy symbol 3 or symbol 4. As another example, when the PDSCH occupies symbols 1-13, the DMRS may occupy symbol 4.

In some possible implementations, the time domain resource location of the DMRS in the PDSCH has a corresponding relationship with the CORESET corresponding to the PDSCH. As an example, different CORESET symbol numbers may correspond to different DMRS time domain resource locations. As an example, when the number of CORESET symbols is 1, the DMRS may be located on a time domain symbol after the symbol where CORESET is located. When the number of CORESET symbols is 2, DMRS may be frequency division multiplexed with SSB. In some possible implementation manners, the corresponding relationship may be obtained in advance, or defined by a protocol, or indicated to the terminal device by the network device when the PDSCH time domain resource is indicated each time, which is not limited in this embodiment of the present application.

As an example, the network device may indicate the number of symbols of CORESET #0 through CORESET #0 configuration information, which may also implicitly indicate DMRS time domain resource location. That is, when the terminal device receives the configuration information, the symbol number of the CORESET #0 may be determined according to the configuration information, and the time domain resource location of the DMRS may also be determined according to the configuration information. In some possible embodiments, the configuration information may be carried in a PBCH payload (payload), or MIB, or PBCH DMRS, which is not limited in this application.

In some optional embodiments of the present application, the first indication information is further used to indicate time domain resources of the DMRS. As an example, the first indication information may explicitly indicate a time domain symbol occupied by the DMRS described above.

In one possible implementation, when the PDSCH includes only time domain symbols overlapping with the SSBs, that is, the PDSCH frequency division multiplexes all the time domain symbols with the SSBs, the first indication information may indicate on which one or more of the overlapping time domain symbols the DMRS is transmitted. As an example, when the PDSCH occupies symbols 2-5 and symbols 2-5 are used for transmitting the SSB, the first indication information may indicate that the DMRS occupies at least one symbol of the symbol set {2,3,4 }.

In one possible implementation, when the PDSCH includes time domain symbols overlapping with the SSBs and includes time domain symbols not overlapping with the SSBs, that is, the PDSCH is frequency division multiplexed with the SSBs on a part of the time domain symbols, the first indication information may further indicate that the DMRS is transmitted on one or more of the overlapping time domain symbols and/or the DMRS is transmitted on one or more of the non-overlapping time domain symbols. As an example, when the PDSCH occupies symbols 1-6 and symbols 2-5 are used for transmitting the SSB, the first indication information may indicate that the DMRS occupies at least one of the symbol sets {2,3,4} and/or occupies at least one of the symbol sets {1,6 }.

It should be noted that, in the embodiment of the present application, a symbol in which a DMRS is located refers to a symbol index in which the DMRS is located.

Optionally, in this embodiment of the application, the first indication information is further used to indicate a mapping type of the PDSCH. In this embodiment of the present application, the mapping type may be type a, type B, or another type, which is not limited in this embodiment of the present application.

As one example, when the DMRS occurs at symbol 2 or symbol 3, the mapping type of the PDSCH may be type a. Specifically, type a can refer to the description above, and is not described herein again for brevity.

As one example, when the DMRS occurs in other symbols than symbol 2and symbol 3, the mapping type of the PDSCH may be type B.

In some possible implementations, the number of persistent symbols of the PDSCH corresponding to type B may be other than the set {2,4,7 }. For example, in type B, the number of persistent symbols for PDSCH may be one of the following set {4,5,6,8,9,11,12,13 }.

In some possible implementations, when the DMRS occurs in other symbols than symbol 2 or symbol 3, and the number of persistent symbols of the PDSCH is other than the set {2,4,7}, the mapping type of the PDSCH at this time may also be referred to as type c (type c), or otherwise, which is not limited in this application. That is to say, in the embodiment of the present application, a new scheduling type C of the PDSCH may be introduced, which is specifically shown in table 2 below:

TABLE 2

Optionally, in this embodiment of the application, the first indication information is further configured to indicate a starting position of a time domain symbol of the PDSCH and a symbol offset value of a symbol where a CORESET corresponding to the PDSCH is located.

In some possible embodiments, the first SSB/RMSI core/PDSCH within 1 slot has the same structure as the second SSB/RMSI core/PDSCH regardless of whether the RMSI core duration is 1 symbol or 2 symbols. Therefore, for two SSBs within 1 slot, the starting position of the time domain symbol of the PDSCH corresponding to each SSB is the same as the symbol offset value of the time domain symbol where the CORESET corresponding to the PDSCH is located. That is to say, one symbol offset value may be used to indicate an offset value between the starting position of the time domain symbol of the PDSCH of the first SSB pair and the symbol where the CORESET corresponding to the PDSCH is located within 1 slot, or between the starting position of the time domain symbol of the PDSCH corresponding to the second SSB and the symbol where the CORESET corresponding to the PDSCH is located.

Here, the offset value of the symbol where the core set corresponding to the PDSCH is located may refer to an offset value of a starting symbol where the core set is located, or an offset value of an ending symbol where the core set is located, which may be specified by a protocol or indicated by a network device, and this is not limited in this embodiment of the present invention.

As an example, when the first SSB within 1 slot occupies symbol 2-5, its corresponding CORESET occupies symbol 0, the second SSB occupies symbols 9 to 12, its corresponding CORESET occupies symbol 7, if the symbol offset value indicating the starting position of the symbol where the PDSCH is located and the starting position of the symbol where the CORESET is located is 2, then for the first SSB, PDSCH occupying symbol 2-6 frequency division multiplexed therewith. For the second SSB, the PDSCH frequency division multiplexed with it occupies symbols 9-13.

In some possible implementations, when the starting position of the PDSCH is indicated with the symbol where CORESET is located as the reference position, the offset value of the starting position of the PDSCH from the symbol where CORESET is located is less than or equal to half of the total number of time domain symbols of 1 slot. As an example, when the total number of time domain symbols of 1 slot is 14, the offset value is less than or equal to 7. In a specific example, the offset value may be one {1,2} of the following set.

Therefore, by using the time domain symbol of the PDSCH relative to the symbol where the corresponding CORESET is located as the symbol offset value to indicate the starting symbol position of the PDSCH, it is possible to use one offset value to indicate at least two different starting time domain positions of the PDSCH, thereby reducing the indication overhead and further reducing the signaling overhead of the system.

Optionally, in this embodiment of the application, the first indication information is further used to indicate a symbol offset value between a starting position of a time domain symbol of the PDSCH and a slot boundary. At this time, one symbol offset value may indicate an offset value between the start position of the time domain symbol of the PDSCH of one SSB pair and the slot boundary where the PDSCH is located.

In some possible embodiments, at least one of the time domain resources of the PDSCH, the time domain resources of the DMRS, the persistent symbol number of the PDSCH, the symbol offset value, the mapping type of the PDSCH, and the like may be further predefined by a protocol. When at least one of the above information is defined by a protocol, the first indication information may not need to indicate the information. When all of the above information is defined by a protocol, the network device may not need to send the first indication information to the terminal device, i.e., steps 610 and 620 are not performed.

The frequency domain resources of the PDSCH may not overlap with the frequency domain resources of the SSBs on time domain symbols on which the PDSCH does not overlap with the SSBs, e.g., may be transmitted on the same frequency domain resources on these time domain symbols as the PDSCH transmitted on the symbols on which the SSBs are transmitted, or the frequency domain resources of the PDSCH may overlap with the frequency domain resources of the SSBs, e.g., may be transmitted over the entire bandwidth of these time domain symbols. The specific transmission mode can be indicated to the terminal device by the network device or specified by the protocol.

As an example, the network device may generate a second indication to the terminal device to indicate RMSI PDSCH the frequency domain resource location. Or the network device may send third indication information to the terminal device to indicate that the PDSCH is frequency division multiplexed on a time domain symbol where the PDSCH overlaps with the SSB, and the PDSCH may be transmitted over the entire bandwidth on a time domain symbol where the PDSCH does not overlap with the SSB. That is to say, the third indication information may indicate that the terminal device acquires the time-frequency resource of the PDSCH in a rate matching (rate matching) manner.

In some possible implementations, the second indication information is used to indicate a frequency domain resource location of the PDSCH, for example, indicating RBs where the PDSCH is located. As an example, the second indication information may indicate a starting RB of the PDSCH, and a frequency domain offset. Wherein, the position of the lowest subcarrier (subcarrier) of the starting RB of the PDSCH, and the frequency domain offset are used to indicate the offset values of the ending RB of the PDSCH and the subcarrier of the starting RB.

In an embodiment of the present application, the second indication information may indicate at least one of the following situations:

in case 1, when the frequency band of RBs occupied by the PDSCH is below the frequency band of RBs occupied by the SSB, such as when the SSB occupies the 15 th to 25 th RBs in a symbol, the starting RB of the PDSCH may be the first RB in the symbol and the frequency domain offset may be 14.

In case 2, when the frequency band of the PDSCH occupying RBs is above the frequency band of the SSB occupying RBs, such as when the SSB occupies the 15 th to 25 th RBs in a symbol, the starting RB of the PDSCH may be 26 and the frequency domain offset may be 14.

For example, the bits required for the second indication information may be

Wherein the content of the first and second substances,

the number of RBs occupied for CORESET 0.

And 620, the network equipment sends the first indication information to the terminal equipment. Correspondingly, the terminal device receives the first indication information from the network device.

Optionally, the network device may further send the second indication information to the terminal device. Correspondingly, the terminal device receives the second indication information from the network device. Or, the network device may further send the third indication information to the terminal device. Correspondingly, the terminal device receives the third indication information from the network device.

In some possible embodiments, the first indication information, the second indication information, or the third indication information may be carried in a Radio Resource Control (RRC) message, or carried in a medium access control element (MAC CE), or carried in downlink control signaling (DCI), which is not limited in this embodiment.

In some possible implementation manners, the first indication information and the second indication information may be carried in the same message and sent to the terminal device, or sent to the terminal device separately, which is not limited in this embodiment of the application. Or the first indication information and the third indication information may be carried in the same message and sent to the terminal device, or sent to the terminal device separately, which is not limited in this embodiment of the application.

And 630, the terminal equipment demodulates the PDSCH according to the demodulation reference signal DMRS in the PDSCH.

In some possible implementations, the terminal device may determine the time domain resource of the PDSCH according to the first indication information sent by the network device. Or, the terminal device may also determine the time domain resource of the PDSCH according to the protocol definition, which is not limited in this embodiment of the present application. Specifically, the time domain resources of the PDSCH can be referred to the description in step 610.

In some possible implementations, the terminal device may further determine the frequency domain resource of the PDSCH according to the second indication information or the third indication information sent by the network device. Or, the terminal device may also determine the frequency domain resource of the PDSCH according to the protocol definition, which is not limited in this embodiment of the present application.

As an example, the terminal device may always detect the corresponding SSB before parsing the RMSI CORESET, for example, the terminal device may obtain a time domain/frequency domain location where the SSB is located, such as an occupied Resource Block (RB) or a number of RBs by blind detection of the SSB. At this time, the terminal device may determine the PDSCH time domain resources according to the relative position relationship between the time-frequency resources of the PDSCH indicated by the first indication information (or predefined by the protocol) and the SSB. Further, the terminal device may determine, through rate matching (or according to the third indication information), that the time-frequency resource coinciding with the SSB is not used for transmission of the PDSCH, that is, PDSCH puncturing (puncturing). Alternatively, the terminal device may determine the frequency domain resources of the PDSCH according to the second indication information.

In some possible implementations, the terminal device obtains the time domain location information of the DMRS by at least one of the following manners:

mode 1: and the terminal equipment acquires the time domain position information of the DMRS according to the first indication information.

Mode 2: and the terminal equipment acquires the time domain position information of the DMRS according to the number of the symbols occupied by the DMRS and the time domain resource position occupied by the DMRS.

Mode 3: and the terminal equipment acquires the time domain position information of the DMRS according to the CORESET and the time domain resource position of the DMRS.

Mode 4: and the terminal equipment determines the time domain position information of the DMRS according to a rule predefined by a protocol. For example, the protocol may predefine the time domain symbols in which the DMRS occupies a middle position among the time domain symbols in which its corresponding PDSCH is located.

Specifically, reference may be made to the above description, and for brevity, the description is not repeated here.

In some possible implementations, when the time domain resources of the DMRS overlap the time domain resources of the SSB and the frequency domain resources of the DMRS do not overlap the frequency domain resources of the SSB and the frequency domain resources of the PDSCH occupy the entire bandwidth of the symbol where the PDSCH is located, since the PSS or the SSS is a known sequence to the terminal device, the terminal device may demodulate the PDSCH occupying the entire bandwidth of the symbol according to the DMRS and the PSS or the SSS frequency-division multiplexed with the DMRS.

Therefore, in the embodiment of the present application, when there is an SSB transmission in the time slot of the PDSCH corresponding to the CORESET, the PDSCH corresponding to the CORESET may be transmitted on the unoccupied bandwidth of the symbol where the SSB is located, so that the PDSCH mapping can be performed when the PDSCH collides with the SSB on the transmitted time-frequency resource (collision), and meanwhile, the time-frequency resource not occupied by the SSB on the time-domain symbol where the SSB is located can be avoided from being wasted, thereby improving the transmission efficiency of the time-frequency resource.

In a possible implementation manner of the present application, the network device and the terminal device may configure the PDSCH mapping table respectively. The PDSCH mapping table may include one or more indexes, where each index corresponds to at least one of time domain resources of the DMRS, a number of persistent symbols of the PDSCH, a starting position of a time domain symbol of the PDSCH and a symbol offset value of a symbol where the CORESET corresponding to the PDSCH is located (the starting position of the time domain symbol of the PDSCH and the symbol offset value of a slot boundary), a mapping type of the PDSCH, and the like.

When the network device determines the mapping method of the PDSCH, the network device may send an index corresponding to the mapping method to the terminal device. The terminal device may determine the time domain position of the PDSCH according to the index and a preconfigured PDSCH mapping table. At this time, the index may be one example of the first indication information in fig. 6 described above.

Table 3 shows an example of a PDSCH mapping table provided in an embodiment of the present application. In some possible implementations, the terminal device and/or the network device may store the table in advance.

Where K0 represents the scheduling delay, S represents the symbol offset value of the PDSCH with respect to the starting boundary (position) of the slot, and L is the number of PDSCH persistent symbols.

It should be noted that, when DMRS occurs in symbol 2 or symbol 3, the PDSCH mapping type at this time may be considered as type a, and when DMRS occurs in other symbols than symbol 2and symbol 3, the PDSCH mapping type at this time may be considered as type B.

The index 1 corresponds to the case where CORESET has 1(symbol 0) symbol, SSB is transmitted on symbols 2-5, and PDSCH is transmitted on symbols 1-5, where the number of persistent symbols L is 5, and the corresponding PDSCH mapping type may be type a or type B (type a/type B). The time-domain location of its DMRS may be configured to: 1and/or {2and/or 3and/or 4}, meaning that the DMRS may be present in symbol 1, and/or symbol 2, and/or symbol 3, and/or symbol 4, i.e., at least one of symbols 1-4.

In the embodiment of the present application, when the position where the DMRS appears is {2and/or 3and/or 4}, it indicates that the DMRS is frequency division multiplexed with the SSB.

In some possible implementations, the correspondence between the number of symbols of the DMRS and the DMRS position may be predefined or indicated by the network device. As an example, when a DMRS with 1 symbol is configured, the DMRS may appear in symbol 2 or symbol 3 or symbol 4, and when a DMRS with 2 symbols is configured, the DMRS with 2 symbols may appear in two symbols of symbols 1 to 4, which is not limited in this embodiment.

In some possible implementations, it may also be predefined, or indicated by the network device that when the number of symbols of the CORESET is 1, the DMRS is located on a time-domain symbol after the symbol where the CORESET is located, that is, on symbol 1.

In some possible implementations, the DMRS may also be predefined or indicated by the network device to be frequency-division multiplexed with the SSB when the number of symbols of the CORESET is 2, i.e., at least one of the symbols 2-4.

Similarly, indexes 2-4 and 11-16 also correspond to the case where the SSB is transmitted on symbols 2-5, and the PDSCH mapping method thereof can refer to index 1, which is not described herein again for brevity.

Index 6 corresponds to the case where the CORESET symbol is 1 or 2, the SSB is transmitted on symbols 9-12, and the PDSCH is transmitted on symbols 9-13. The number of persistent symbols L is 5, and the corresponding PDSCH mapping type may be type B. The time-domain location of its DMRS may be configured to: 13and/or {10and/or 11}, meaning that the DMRS may be present in symbol 13, and/or symbol 10, and/or symbol 11, i.e., at least one of symbol 13, symbol 10, and symbol 11.

In some possible implementations, the correspondence between the number of symbols of the DMRS and the DMRS position may be predefined or indicated by the network device. As an example, when a 1-symbol DMRS is configured, the DMRS may appear in symbol 13 or symbol 10 or symbol 11, and when a 2-symbol DMRS is configured, the 2 DMRS symbols may appear in two symbols of

symbols

13, 10, and 11, which is not limited in this embodiment of the application.

In some possible implementations, it may also be predefined or indicated by the network device that when the number of symbols of the CORESET is 1, the DMRS is located on a time-domain symbol after the symbol where the CORESET is located, i.e., on symbol 9.

In some possible implementations, the DMRS may also be predefined or indicated by the network device to be frequency-division-multiplexed with the SSB when the number of CORESET symbols is 2, i.e., at least one of the symbol 10and the symbol 11.

Similarly, indexes 5, 7-9 also correspond to the case where the SSB is transmitted on symbols 9-12, and the PDSCH mapping method thereof may refer to index 6, which is not described herein again for brevity.

The index 10 corresponds to the case where the symbol of CORESET is 1(symbol 0), SSB is transmitted on symbols 8-11, PDSCH is transmitted on symbols 7-12, where the number of persistent symbols L is 5, and the corresponding PDSCH mapping type may be type B. The time-domain location of its DMRS may be configured to: 7and/or {9and/or 10}, meaning that the DMRS may be present in symbol 7, and/or symbol 9, and/or symbol 10, i.e., at least one of

symbols

7, 9, 10.

In the embodiment of the present application, when the position where the DMRS appears is {9and/or 10}, it indicates that the DMRS is frequency division multiplexed with the SSB.

In some possible implementations, the correspondence between the number of symbols of the DMRS and the DMRS position may be predefined or indicated by the network device. As an example, when a 1-symbol DMRS is configured, the DMRS may appear in symbol 7 or symbol 9 or symbol 10, and when a 2-symbol DMRS is configured, the 2 DMRS symbols may appear in two of

symbols

7, 9, and 10, which is not limited in this embodiment of the application.

In some possible implementations, it may also be predefined or indicated by the network device that when the number of symbols of the CORESET is 1, the DMRS is located on a time-domain symbol after the symbol where the CORESET is located, i.e., on symbol 8.

Correspondingly, the terminal device may determine the time domain resource where the DMRS is located in the PDSCH according to the PDSCH mapping manner indicated by the acquired index, and/or the number of symbols of the DMRS, and/or the number of symbols of the CORESET. Then, the PDSCH is demodulated according to the DMRS.

It should be noted that table 3 is only used as an example, for example, the PDSCH mapping method corresponding to any index may also be equivalently modified, or other possible PDSCH mapping methods may also be included, for example, the PDSCH mapping method in the case of simultaneous two SSB transmissions, which is not limited in this embodiment of the present application. Here, the equivalent modification is to replace the parameter S with X, where X represents a symbol offset value of the starting position (or the ending position) of the PDSCH time domain symbol and the corresponding CORESET time domain symbol. In the mapping scheme of the PDSCH under the condition of simultaneous two SSB transmissions, the mapping scheme of the PDSCH of the first SSB is, for example, one of the mapping schemes in indexes 1 to 4, and the mapping scheme of the PDSCH of the second SSB is, for example, one of the mapping schemes in indexes 5 to 9, but the embodiment of the present invention is not limited thereto.

When table 3 includes other possible PDSCH mapping manners, the time domain configuration option in table 3 may exceed 16 entries, for example, may be 18 entries. At this point, at least 5 bits are required to indicate. The current NR standard supports a mapping scheme that uses 4 bits (bit) to indicate PDSCH, i.e., the supported time domain configuration options do not exceed 16 items. In this case, embodiments at the time of this application may merge several entries in table 3 such that the total indicator does not exceed 16 entries.

One possible implementation manner may be that, when the symbol offset value S used for representing the starting boundary (position) of the PDSCH with respect to the slot in table 3 is replaced with the symbol offset value X used for the starting position of the time domain symbol of the PDSCH and the corresponding CORESET, because the structure of the first SSB/RMSI CORESET/PDSCH and the structure of the second SSB/RMSI CORESET/PDSCH within 1 slot are the same, the same symbol offset value can represent the time domain positions of the time domain symbols of two PDSCHs, so that the indication overhead can be reduced.

Taking the PDSCH mapping scheme corresponding to index 1and the PDSCH mapping scheme corresponding to index 5 in table 3 as examples, since the time domain position of the PDSCH has the same offset value with respect to the start position of its corresponding CORESET in both of these two schemes, X may be 1 in both of these two schemes. Thus, index 1and index 5 may be merged into one entry, e.g., as new index 1.

Correspondingly, the terminal device may determine the starting position and duration of the corresponding PDSCH and the time domain position of the DMRS according to the received index value, the location of the SSB, and the location of the CORESET. For example, when the terminal device receives indication information indicating index 1, and detects that the SSB is located in symbol 9-12 in the slot, X ═ 1 indicates that the PDSCH starts from symbol 8 and symbol 12 ends; in the case where symbols 2-5 with SSBs within the slot are detected, then the RMSI CORESET time domain indication 1 indicates that the PDSCH starts from symbol 1and ends at symbol 5.

Similarly, index 2and index 6 may also be merged into one entry, e.g., as new index 2; index 3and index 9 may also be merged into one entry, e.g., as new index 3; index 4 and index 8 may also be combined into one item, such as new index 4, and the like, but the embodiment of the present application is not limited thereto.

The PDSCH time domain configuration in NR may also be indicated by Start and Length Indicator Values (SLIVs), each of which corresponds to a unique PDSCH start symbol position and duration. The calculation method is as follows:

when the SSB pattern is as shown in figures 7A and 7B,

case 1: RMSI PDSCH always follow the corresponding RMSI CORESET transmission.

SLIV — 1 when the parameter S is RMSI PDSCH starting symbol vs RMSI CORESET ending symbol, L being the number of consecutive symbols of RMSI PDSCH;

when the parameter S is RMSI PDSCH start symbol relative to the RMSI CORESET start symbol,

SLIV＝(R-k)×(L-1)+(S-k),

wherein k is 1, S is 1,2, the specific value of S can be determined according to the number of symbols for continuing CORESET, and R is maximum (S) +1 is 3;

case 2: RMSI PDSCH do not follow the corresponding RMSI CORESET for transmission.

When the parameter S is RMSI PDSCH start symbol relative to RMSI CORESET end symbol, if (L-1) ≦ 3:

SLIV＝(7-C)×(L-1)+S，

in other cases, SLIV is (7-C) × (8-C-L) + (6-C-S),

where C is 1,2, and a specific value of C may be obtained from MIB or PBCH payload.

When the parameter S is RMSI PDSCH start symbol relative to the RMSI CORESET start symbol, if (L-1) ≦ 3:

SLIV＝(7-C)×(L-1)+(S-C)，

in other cases, SLIV is (7-C) × (8-C-L) + (6-S),

When the SSB pattern is as shown in figure 8A or figure 8B,

case 1: RMSI PDSCH always follow the corresponding RMSI CORESET for transmission.

When the parameter S is RMSI PDSCH starting symbol relative to RMSI CORESET ending symbol, SLIV ═ L-1, L is PDSCH persistent symbol number;

when the starting symbol position is RMSI PDSCH relative to the RMSI CORESET starting symbol for parameter S,

SLIV＝(R-k)*(L-1)+(S-k)，

wherein, k is 1, S is 1,2, the specific value of S is determined according to the number of continuous signs of CORESET, and R is maximum (S) +1 is 3.

When the parameter S is RMSI PDSCH the starting symbol relative to the RMSI CORESET ending symbol, if (L-1) ≦ 3:

SLIV＝(6-C)*(L-1)+S；

otherwise, SLIV is (6-C) × (7-C-L) + (5-C-S),

SLIV＝(6-C)*(L-1)+(S-C)；

otherwise, SLIV is (6-C) × (7-C-L) + (5-S),

wherein, C is 1,2, and the value of C can be obtained from MIB or PBCH payload.

When the SSB pattern is as shown in figure 9A or figure 9B,

case 1: RMSI PDSCH always follow the corresponding RMSI CORESET transmission.

SLIV＝(R-k)*(L-1)+(S-k)，

SLIV＝(14-C)*(L-1)+S，

in other cases, the SLIV is (14-C) × (15-C-L) + (13-C-S),

SLIV＝(14-C)*(L-1)+(S-C)，

in other cases, SLIV ═ 14-C (15-C-L) + (13-S),

It should be noted that, in the NR-U communication system, only the SSB pattern can be supported to support the case of fig. 7 or fig. 8, and therefore, no additional indication information is required to indicate the SSB pattern.

In addition, the network device may also select whether to use the SSB pattern in fig. 7 or fig. 8, or to use the SSB pattern in fig. 9 according to a Discovery Reference Signal (DRS) unit (unit) length. The network device may send indication information to the terminal device to indicate which SSB pattern to select. As an example, the indication information may be carried in the MIB or the PBCH payload, which is not limited in this embodiment.

Therefore, in this embodiment of the present application, the terminal device may determine PDSCH SLIV a calculation formula according to different SSB patterns, so as to be able to resolve the start symbol position and duration corresponding to RMSI PDSCH.

The above-mentioned scheme provided by the embodiment of the present application is introduced mainly from the perspective of interaction between a terminal device and a network device. It is understood that the network device and the terminal device include hardware structures and/or software modules for performing the respective functions in order to implement the functions. The elements and algorithm steps of the various examples described in connection with the embodiments disclosed herein may be embodied in hardware or in a combination of hardware and computer software. Whether a function is performed as hardware or computer software drives hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present teachings.

In the embodiment of the present application, the network device, the terminal device, and the like may be divided into function units according to the method example, for example, each function unit may be divided corresponding to each function, or two or more functions may be integrated into one processing unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit. It should be noted that the division of the unit in the embodiment of the present application is schematic, and is only a logic function division, and there may be another division manner in actual implementation.

In the case of an integrated unit, fig. 10 shows a possible exemplary block diagram of an apparatus involved in the embodiments of the present application, and the apparatus 1000 may exist in the form of software, hardware or a combination of software and hardware. The apparatus 1000 comprises: a processing unit 1002 and a communication unit 1003. The processing unit 1002 is used for controlling and managing the operation of the apparatus. The communication unit 1003 is used to support communication of the apparatus with other devices. Optionally, the apparatus may further comprise a storage unit 1001 for storing program codes and data of the apparatus.

The apparatus 1000 shown in fig. 10 may be a network device according to an embodiment of the present application.

A processing unit 1002, configured to determine first indication information, where the first indication information is used to indicate time-frequency resources of a PDSCH (physical downlink shared channel), where the time-domain resources transmitted by the PDSCH overlap the time-domain resources transmitted by an SSB (synchronization signal block), the time-domain resources of a DMRS (demodulation reference signal) in the PDSCH do not overlap the time-domain resources of the SSB, or the time-domain resources of the DMRS overlap the time-domain resources of the SSB and the frequency-domain resources of the DMRS do not overlap the frequency-domain resources of the SSB.

A communication unit 1003, configured to send the first indication information to a terminal device.

Optionally, the communication unit 1003 is further configured to send second indication information, where the second indication information is used to indicate frequency domain resources of the PDSCH, and the frequency domain resources of the PDSCH and the frequency domain resources of the SSB are not overlapped.

In particular, the processing unit 1002 can enable the apparatus 1000 to perform actions performed by network devices in the above-described method examples, for example, the processing unit 1002 enables the apparatus 1000 to perform 610 in fig. 6, and/or other related communication procedures. Communication unit 1003 is capable of supporting communication between apparatus 1000 and the terminal device, e.g., communication unit 1003 supports apparatus 1000 performing step 620 in fig. 6, and/or other related communication procedures.

Illustratively, the processing unit 1002 may be a processor or a controller, such as a Central Processing Unit (CPU), a general purpose processor, a Digital Signal Processor (DSP), an application-specific integrated circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. Which may implement or perform the various illustrative logical blocks, units, and circuits described in connection with the disclosure. The processor may also be a combination of computing functions, e.g., comprising one or more microprocessors, DSPs, and microprocessors, among others. The communication unit 1003 may be a communication interface, which is a generic term, and in a specific implementation, may include one or more interfaces. The communication unit 1003 may also be a transmitting/receiving unit. The storage unit 1001 may be a memory.

When the processing unit 1002 is a processor, the communication unit 1003 is a transceiver, and the storage unit 1001 is a memory, the apparatus 1000 according to the embodiment of the present application may be the apparatus 1100 shown in fig. 11.

Referring to fig. 11, the apparatus 1100 includes: a processor 1102, and a communication interface 1103. Further, the apparatus 1100 may further include a memory 1101. Optionally, the apparatus 1100 may also include a bus. The communication interface 1103, the processor 1102, and the memory 1101 may be connected to each other by a bus; the bus may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 11, but this is not intended to represent only one bus or type of bus.

The processor 1102 may perform various functions of the apparatus 1100 by running or executing programs stored in the memory 1101.

Illustratively, the apparatus 1100 shown in fig. 11 may be a network device according to an embodiment of the present application. At this time, the processor 1102 may perform the actions performed by the network device in the above-described method examples by running or executing a program stored in the memory 1101.

In the case of an integrated unit, fig. 12 shows a possible exemplary block diagram of another apparatus involved in the embodiments of the present application, and the apparatus 1200 may be in the form of software, hardware, or a combination of software and hardware. The apparatus 1200 includes: a processing unit 1202 and a communication unit 1203. The processing unit 1202 is used for controlling and managing the operation of the apparatus. The communication unit 1203 is used for supporting the communication of the apparatus with other devices. Optionally, the apparatus may further comprise a storage unit 1201 for storing program codes and data of the apparatus.

The apparatus 1200 shown in fig. 12 may be a terminal device, and may also be a chip applied to the terminal device.

The communication unit 1203 is configured to receive first indication information, where the first indication information is used to indicate time domain resources of a physical downlink shared channel PDSCH, where the time domain resources transmitted by the PDSCH overlap with the time domain resources transmitted by a synchronization signal block SSB.

The processing unit 1202 is configured to demodulate the PDSCH according to a demodulation reference signal DMRS in the PDSCH, where time domain resources of the DMRS do not overlap with time domain resources of the SSB, or the time domain resources of the DMRS overlap with the time domain resources of the SSB and the frequency domain resources of the DMRS do not overlap with the frequency domain resources of the SSB.

The optional processing unit 1202 is further configured to obtain the time domain resource of the DMRS according to a control information resource set, CORESET, corresponding to the PDSCH, where the time domain resource of the CORESET and the time domain resource of the DMRS have a corresponding relationship.

Optionally, the communication unit 1203 is further configured to receive second indication information, where the second indication information is used to indicate frequency domain resources of the PDSCH, and the frequency domain resources of the PDSCH and the frequency domain resources of the SSB are not overlapped.

In particular, processing unit 1202 can enable apparatus 1200 to perform actions by terminal devices in the various method examples described above, e.g., processing unit 1202 enables apparatus 1202 to perform 630 in fig. 6, and/or other processes for the techniques described herein. The communication unit 1203 is capable of supporting communication between the apparatus 1200 and a network device, e.g., the communication unit 1203 supports the apparatus 1200 to perform step 620 in fig. 6, and/or other related communication procedures.

Illustratively, the processing unit 1202 may be a processor or controller, such as a CPU, general purpose processor, DSP, ASIC, FPGA or other programmable logic device, transistor logic device, hardware component, or any combination thereof. Which may implement or perform the various illustrative logical blocks, units, and circuits described in connection with the present disclosure. The processor may also be a combination of computing functions, e.g., comprising one or more microprocessors, DSPs, and microprocessors, among others. The communication unit 1203 may be a communication interface, which is a generic term that, in a particular implementation, may include one or more interfaces. The communication unit 1203 may also be a transmitting/receiving unit. The storage unit 1201 may be a memory.

When the processing unit 1202 is a processor, the communication unit 1203 is a transceiver, and the storage unit 1201 is a memory, the apparatus 1200 according to the embodiment of the present application may be a terminal device shown in fig. 13.

Fig. 13 shows a simplified schematic diagram of a possible design structure of the terminal device involved in the embodiments of the present application. The terminal device 1300 includes a transmitter 1301, a receiver 1302 and a processor 1303. The processor 1303 may be a controller, and is shown as "controller/processor 1303" in fig. 13. Optionally, the terminal device 1300 may further include a modulation and demodulation processor 1305, where the modulation and demodulation processor 1305 may include an encoder 1306, a modulator 1307, a decoder 1308, and a demodulator 1309.

In one example, the transmitter 1301 conditions (e.g., converts to analog, filters, amplifies, and frequency upconverts, etc.) the output samples and generates an uplink signal, which is transmitted via an antenna to the base station as described in the embodiments above. On the downlink, the antenna receives the downlink signal transmitted by the base station in the above embodiment. Receiver 1302 conditions (e.g., filters, amplifies, downconverts, and digitizes, etc.) the received signal from the antenna and provides input samples. Within modem processor 1305, an encoder 1306 receives and processes (e.g., formats, encodes, and interleaves) traffic data and signaling messages to be transmitted on the uplink. A modulator 1307 further processes (e.g., symbol maps and modulates) the encoded traffic data and signaling messages and provides output samples. A demodulator 1309 processes (e.g., demodulates) the input samples and provides symbol estimates. A decoder 1308 processes (e.g., deinterleaves and decodes) the symbol estimates and provides decoded data and signaling messages for transmission to terminal device 1300. The encoder 1306, modulator 1307, demodulator 1309, and decoder 1308 may be implemented by a combined modem processor 1305. These elements are handled according to the radio access technology employed by the radio access network (e.g., the access technology of LTE, 5G, and other evolved systems). Note that when the terminal device 1300 does not include the modem processor 1305, the above-described functions of the modem processor 1305 may also be performed by the processor 1303.

The processor 1303 controls and manages the actions of the terminal device 1300, and is used to execute the processing procedure performed by the terminal device 1300 in the embodiment of the present application. For example, the processor 1303 is further configured to execute the processing procedure related to the terminal device in the method shown in fig. 6 and/or other procedures of the technical solutions described in this application.

Further, the terminal device 1300 may further include a memory 1304, the memory 1304 being used for storing program codes and data for the terminal device 1300.

The steps of a method or algorithm described in connection with the disclosure of the embodiments of the application may be embodied in hardware or in software instructions executed by a processor. The software instructions may be comprised of corresponding software modules that may be stored in Random Access Memory (RAM), flash memory, Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), registers, a hard disk, a removable disk, a compact disc read only memory (CD-ROM), or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. Of course, the storage medium may also be integral to the processor. The processor and the storage medium may reside in an ASIC. In addition, the ASIC may reside in a control plane entity of the centralized unit, a user plane entity of the centralized unit, a terminal device, or a unified data storage network element. Of course, the processor and the storage medium may reside as discrete components in a control plane entity of a centralized unit, a user plane entity of a centralized unit, a terminal device, or a unified data storage network element.

Those skilled in the art will recognize that, in one or more of the examples described above, the functions described in the embodiments of the present application may be implemented in hardware, software, firmware, or any combination thereof. When implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a general purpose or special purpose computer.

The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the embodiments of the present application in further detail, and it should be understood that the above-mentioned embodiments are only specific embodiments of the present application, and are not intended to limit the scope of the embodiments of the present application, and any modifications, equivalent substitutions, improvements and the like made on the basis of the technical solutions of the embodiments of the present application should be included in the scope of the embodiments of the present application.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall 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 method of data transmission, comprising:

the method comprises the steps that terminal equipment receives first indication information, wherein the first indication information is used for indicating time domain resources of a Physical Downlink Shared Channel (PDSCH), the number of continuous symbols of the PDSCH, the initial position of time domain symbols of the PDSCH and a symbol offset value of a symbol where CORESET corresponding to the PDSCH is located, and the time domain resources transmitted by the PDSCH are overlapped with the time domain resources transmitted by a Synchronous Signal Block (SSB);

2. The method of claim 1, further comprising:

and the terminal equipment acquires the time domain resource of the DMRS according to a control information resource set CORESET corresponding to the PDSCH, wherein the time domain resource of the CORESET and the time domain resource of the DMRS have a corresponding relation.

3. The method of claim 1, further comprising:

receiving second indication information, where the second indication information is used for indicating frequency domain resources of the PDSCH, and the frequency domain resources of the PDSCH are not overlapped with the frequency domain resources of the SSB.

4. The method according to any of claims 1-3, wherein the first indication information is further used for indicating time domain resources of the DMRS.

5. The method according to any of claims 1-3, wherein the symbol index of the DMRS is at least one of the following sets: {1,2,3,4,6,7,8,9,10,11,12,13}.

6. A method according to any one of claims 1 to 3, wherein the number of persistent symbols is one of the following set: {4,5,6,8,9,11,12,13,14}.

7. A method according to any of claims 1-3, wherein the symbol offset value is one from the following set: {1,2}.

8. The method according to any of claims 1-3, wherein the first indication information is further used for indicating a mapping type of the PDSCH, and wherein when the mapping type is type B, the number of persistent symbols is at least one from the following set: {4,5,6,8,9,11,12,13,14}.

9. The method of any of claims 1-3, wherein the frequency-domain resources of the PDSCH occupy the entire bandwidth of the symbol on which the PDSCH is located when the time-domain resources of the DMRS overlap the time-domain resources of the SSB and the frequency-domain resources of the DMRS do not overlap the frequency-domain resources of the SSB.

10. A method of data transmission, comprising:

the method comprises the steps that network equipment determines first indication information, wherein the first indication information is used for indicating time-frequency resources of a Physical Downlink Shared Channel (PDSCH), the number of continuous symbols of the PDSCH, the initial position of time-domain symbols of the PDSCH and a symbol offset value of a symbol where CORESET corresponding to the PDSCH is located, the time-domain resources transmitted by the PDSCH are overlapped with the time-domain resources transmitted by a Synchronous Signal Block (SSB), the time-domain resources of a demodulation reference signal (DMRS) in the PDSCH are not overlapped with the time-domain resources of the SSB, or the time-domain resources of the DMRS are overlapped with the time-domain resources of the SSB and the frequency-domain resources of the DMRS are not overlapped with the frequency-domain resources of the SSB;

11. The method of claim 10, further comprising:

and sending second indication information, wherein the second indication information is used for indicating frequency domain resources of the PDSCH, and the frequency domain resources of the PDSCH are not overlapped with the frequency domain resources of the SSB.

12. The method of claim 10 or 11, wherein the first indication information is further used for indicating time domain resources of the DMRS.

13. The method according to claim 10 or 11, wherein the symbol index of the DMRS is at least one of the following sets: {1,2,3,4,6,7,8,9,10,11,12,13}.

14. The method according to claim 10 or 11, wherein the number of persistent symbols is one of the following set: {4,5,6,8,9,11,12,13,14}.

15. The method according to claim 10 or 11, wherein the symbol offset value is one of the following set: {1,2}.

16. The method according to claim 10 or 11, wherein the first indication information is further used for indicating a mapping type of the PDSCH, wherein when the mapping type is type B, the persistent symbol count is at least one from the following set: {4,5,6,8,9,11,12,13,14}.

17. The method of claim 10 or 11, wherein the frequency-domain resources of the PDSCH occupy the entire bandwidth of the symbol on which the PDSCH is located when the time-domain resources of the DMRS overlap with the time-domain resources of the SSB and the frequency-domain resources of the DMRS do not overlap with the frequency-domain resources of the SSB.

18. An apparatus for data transmission, comprising:

a receiving unit, configured to receive first indication information, where the first indication information is used to indicate time domain resources of a physical downlink shared channel PDSCH, a persistent symbol number of the PDSCH, a starting position of a time domain symbol of the PDSCH, and a symbol offset value of a symbol where a CORESET corresponding to the PDSCH is located, where the time domain resources transmitted by the PDSCH overlap with the time domain resources transmitted by a synchronization signal block SSB;

and a processing unit, configured to demodulate the PDSCH according to a demodulation reference signal DMRS in the PDSCH, where a time domain resource of the DMRS does not overlap a time domain resource of the SSB, or the time domain resource of the DMRS overlaps the time domain resource of the SSB and a frequency domain resource of the DMRS does not overlap the frequency domain resource of the SSB.

19. The apparatus of claim 18, wherein the processing unit is further configured to obtain time domain resources of the DMRS according to a set of control information resources, CORESET, corresponding to the PDSCH, wherein the time domain resources of the CORESET and the time domain resources of the DMRS have a corresponding relationship.

20. The apparatus of claim 18,

the receiving unit is further configured to receive second indication information, where the second indication information is used to indicate frequency domain resources of the PDSCH, and the frequency domain resources of the PDSCH do not overlap with the frequency domain resources of the SSB.

21. The apparatus of any one of claims 18-20, wherein the first indication information is further used for indicating time domain resources of the DMRS.

22. The apparatus of any one of claims 18-20, wherein the symbol index of the DMRS is at least one of the following set: {1,2,3,4,6,7,8,9,10,11,12,13}.

23. The apparatus according to any of claims 18-20, wherein the number of persistent symbols is one of the following set: {4,5,6,8,9,11,12,13,14}.

24. The apparatus according to any of claims 18-20, wherein the symbol offset value is one of the following set: {1,2}.

25. The apparatus according to any of claims 18-20, wherein the first indication information is further configured to indicate a mapping type of the PDSCH, and wherein when the mapping type is type B, the number of persistent symbols is at least one from the following set: {4,5,6,8,9,11,12,13,14}.

26. The apparatus of any of claims 18-20, wherein the frequency-domain resources of the PDSCH occupy the entire bandwidth of the symbol on which the PDSCH is located when the time-domain resources of the DMRS overlap the time-domain resources of the SSB and the frequency-domain resources of the DMRS do not overlap the frequency-domain resources of the SSB.

27. An apparatus for data transmission, comprising: a processing unit, configured to determine first indication information, where the first indication information is used to indicate time-frequency resources of a PDSCH (physical downlink shared channel), a persistent symbol number of the PDSCH, a starting position of a time-domain symbol of the PDSCH, and a symbol offset value of a symbol where a CORESET corresponding to the PDSCH is located, where the time-domain resources transmitted by the PDSCH overlap with the time-domain resources transmitted by a synchronization signal block SSB, the time-domain resources of a DMRS in the PDSCH do not overlap with the time-domain resources of the SSB, or the time-domain resources of the DMRS overlap with the time-domain resources of the SSB and the frequency-domain resources of the DMRS do not overlap with the frequency-domain resources of the SSB;

and the sending unit is used for sending the first indication information to the terminal equipment.

28. The apparatus of claim 27,

the transmitting unit is further configured to transmit second indication information, where the second indication information is used to indicate frequency domain resources of the PDSCH, and the frequency domain resources of the PDSCH do not overlap with the frequency domain resources of the SSB.

29. The apparatus of claim 27 or 28, wherein the first indication information is further used for indicating time domain resources of the DMRS.

30. The apparatus of claim 27 or 28, wherein the symbol index of the DMRS is at least one of the following set: {1,2,3,4,6,7,8,9,10,11,12,13}.

31. The apparatus according to claim 27 or 28, wherein the number of persistent symbols is one of the following set: {4,5,6,8,9,11,12,13,14}.

32. The apparatus according to claim 27 or 28, wherein the symbol offset value is one of the following sets: {1,2}.

33. The apparatus according to claim 27 or 28, wherein the first indication information is further used for indicating a mapping type of the PDSCH, wherein when the mapping type is type B, the number of persistent symbols is at least one from the following set: {4,5,6,8,9,11,12,13,14}.

34. The apparatus of claim 27 or 28, wherein the frequency-domain resources of the PDSCH occupy the entire bandwidth of the symbol on which the PDSCH is located when the time-domain resources of the DMRS overlap the time-domain resources of the SSB and the frequency-domain resources of the DMRS do not overlap the frequency-domain resources of the SSB.

35. A communications apparatus comprising a processor, a memory, and a communications interface, the communications interface configured to receive/transmit signals, the memory having stored therein instructions that, when executed by the processor, cause the apparatus to perform the method of any of claims 1-17.

36. A computer-readable storage medium, in which a computer program or instructions is stored which, when executed by a communication apparatus, carries out the method of any one of claims 1-17.