CN111585731B

CN111585731B - Communication method and device

Info

Publication number: CN111585731B
Application number: CN201910118199.0A
Authority: CN
Inventors: 刘鹍鹏; 刘显达
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2019-02-15
Filing date: 2019-02-15
Publication date: 2021-10-01
Anticipated expiration: 2039-02-15
Also published as: CN111585731A; WO2020164368A1

Abstract

The application provides a communication method and device. The method comprises the following steps: when the terminal equipment supports various different types of DMRS sequences, the terminal equipment can select one type of DMRS sequence, namely the type of the DMRS sequence is determined, and the access network equipment can know the type of the DMRS sequence determined by the terminal equipment, so that normal communication can be kept between the terminal equipment and the access network equipment.

Description

Communication method and device

Technical Field

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

Background

The Demodulation Reference Signal (DMRS) is used for performing channel estimation when a receiving end receives data information or control information, and demodulates and decodes the data information or the control information to be received according to a result of the channel estimation to obtain information bits. In a New Radio (NR) Rel-15, a Zadoff-Chu sequence (ZC sequence) is adopted as a DMRS sequence.

When a pi/2 Binary Phase Shift Keying (BPSK) modulation mode is used for an uplink discrete fourier transform spread OFDM (DFT-spread OFDM, DFT-s-OFDM) waveform and a filter is used, if a ZC sequence is used for a DMRS corresponding to a PUSCH for the uplink DFT-s-OFDM waveform, a peak-to-average power ratio (PAPR) of the DMRS is higher than that of transmission data, which causes spurious emission of pilot signals out of band and loss of signals in band, affects channel estimation performance, or causes PAPR limitation of the uplink coverage. Based on this, other DMRS sequences (such as Computer Generated Sequences (CGS), Gold sequences, etc.) are added to Rel-16, and the other sequences have the property of low PAPR (equivalent to data modulated by pi/2 BPSK), thereby solving the problem caused by the ZC Sequence adopted by DMRS in Rel-15.

Based on this, the terminal device will have multiple DMRS sequences available, and how to maintain normal communication between the terminal device and the access network device at this time is a problem to be solved.

Disclosure of Invention

The application provides a communication method and a communication device, which are used for realizing normal communication between terminal equipment and access network equipment according to a selected DMRS sequence.

In a first aspect, the present application provides a communication method, including: terminal equipment determines a demodulation reference signal (DMRS) sequence of a Physical Uplink Shared Channel (PUSCH); the terminal equipment determines physical random access channel PRACH resources according to the DMRS sequence; and the terminal equipment sends a random access preamble on the PRACH resource. Based on the scheme, when the terminal equipment supports various different types of DMRS sequences, the terminal equipment can select one type of DMRS sequence, namely the type of the DMRS sequence is determined, and the access network equipment can acquire the type of the DMRS sequence determined by the terminal equipment, so that normal communication can be kept between the terminal equipment and the access network equipment.

In one possible implementation method, the DMRS sequence is a sequence of a DMRS of a PUSCH carrying Msg 3.

In one possible implementation method, the terminal device transmits the DMRS of the PUSCH according to the DMRS sequence.

In a possible implementation method, the terminal device receives configuration information of PRACH resources configured by an access network device; and the terminal equipment determines the PRACH resource corresponding to the DMRS sequence from the PRACH resource configured by the access network equipment.

In a possible implementation method, the terminal device is preconfigured with a correspondence between the DMRS sequence and the PRACH resource, or a protocol predefines the correspondence between the DMRS sequence and the PRACH resource. Optionally, the correspondence is indicated by the access network device through higher layer signaling (such as SIB or PBCH information).

In one possible implementation method, the determining, by the terminal device, a DMRS sequence of a PUSCH includes: the terminal equipment measures signals and determines signal receiving power (RSRP); the terminal equipment determines an RSRP grade corresponding to the RSRP; and the terminal equipment determines the DMRS sequence according to the RSRP grade.

In a possible implementation method, the determining, by the terminal device, a DMRS sequence of a PUSCH according to the RSRP level includes: the RSRP grade is a first grade, and the terminal equipment determines that the DMRS sequence of the PUSCH is a first DMRS sequence; or the RSRP grade is a second grade, the terminal equipment supports a second DMRS sequence, and the terminal equipment determines that the DMRS sequence of the PUSCH is the second DMRS sequence; or the RSRP grade is a second grade, the terminal equipment does not support a second DMRS sequence, and the terminal equipment determines that the DMRS sequence of the PUSCH is a first DMRS sequence; optionally, RSRP corresponding to the first level is greater than RSRP corresponding to the second level.

In a possible implementation method, the determining, by the terminal device, a PRACH resource according to the DMRS sequence includes: the DMRS sequence is a first DMRS sequence, the RSRP grade is the first grade, and the terminal equipment determines that the PRACH resource is a first PRACH resource; or, the DMRS sequence is a first DMRS sequence, the RSRP level is the second level, and the terminal device determines that the PRACH resource is a second PRACH resource; or, the DMRS sequence is a second DMRS sequence, and the RSRP level is the second level, and the terminal device determines that the PRACH resource is a third PRACH resource; wherein the first PRACH resource, the second PRACH resource, and the third PRACH resource are different.

In one possible implementation method, the DMRS sequence is a first DMRS sequence or a second DMRS sequence, the first DMRS sequence is a frequency domain sequence, and the second DMRS sequence is a time domain sequence.

In one possible implementation method, the first DMRS sequence is a ZC sequence, the second DMRS sequence is a CGS, or a Gold sequence.

In one possible implementation, the CGS sequence is a pi/2 Binary Phase Shift Keying (BPSK) sequence or an 8PSK sequence.

In a second aspect, the present application provides a communication method, including: the access network equipment detects the PRACH resource of the terminal equipment and determines the PRACH resource bearing preamble; and the access network equipment determines the DMRS sequence of the PUSCH of the terminal equipment according to the PRACH resource bearing the preamble. Based on the scheme, when the terminal equipment supports various different types of DMRS sequences, the terminal equipment can select one type of DMRS sequence, namely the type of the DMRS sequence is determined, and the access network equipment can acquire the type of the DMRS sequence determined by the terminal equipment, so that normal communication can be kept between the terminal equipment and the access network equipment.

In a possible implementation method, the access network device obtains the MSG3 carried by the PUSCH according to the DMRS.

In one possible implementation, the first DMRS sequence is a ZC sequence, the second DMRS sequence is a computer generated sequence CGS, or a Gold sequence.

In one possible implementation, the CGS sequence is a pi/2 binary phase shift keying BPSK modulated sequence or an 8phase shift keying 8PSK modulated sequence.

In a possible implementation method, the access network device is preconfigured with a correspondence between the DMRS sequence and the PRACH resource, or a protocol predefines the correspondence between the DMRS sequence and the PRACH resource.

In a third aspect, the present application provides a communication apparatus having a function of a communication method that implements the method of any of the above aspects or any of the aspects. 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 a fourth aspect, the present application provides a communication apparatus comprising: a processor and a memory; the memory is configured to store computer-executable instructions, and when the apparatus is running, the processor executes the computer-executable instructions stored by the memory to cause the apparatus to perform the communication method as described above in any aspect or any aspect implementing the method.

In a fifth aspect, the present application provides a communication device, comprising: comprising means or units for performing the steps of any of the above aspects.

In a sixth aspect, the present application provides a communications device comprising a processor and an interface circuit, the processor being configured to communicate with other devices via the interface circuit and to perform any of the methods provided in any of the above aspects. The processor includes one or more.

In a seventh aspect, the present application provides a communication device, including a processor, connected to a memory, and configured to invoke a program stored in the memory to perform a method in any implementation manner of any aspect. The memory may be located within the device or external to the device. And the processor includes one or more.

In an eighth aspect, the present application further provides a computer-readable storage medium having stored therein instructions, which, when run on a computer, cause the processor to perform the method of any of the above aspects.

In a ninth aspect, the present application also provides a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of any of the above aspects.

In a tenth aspect, the present application further provides a chip system, including: a processor configured to perform the method of the above aspects.

In an eleventh aspect, the present application further provides a communication system, including a terminal device configured to execute any of the implementation methods of the first aspect or the first aspect, and an access network device configured to execute any of the implementation methods of the second aspect or the second aspect.

Drawings

Fig. 1 is a schematic view of an application scenario in which the present application is applied;

fig. 2 is a schematic flow chart of a communication method provided in the present application;

fig. 3 is a schematic diagram of a communication device provided in the present application;

fig. 4 is a schematic diagram of another communication device provided in the present application;

fig. 5 is a schematic diagram of another communication device provided in the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more clear, the present application will be further described in detail with reference to the accompanying drawings. The particular methods of operation in the method embodiments may also be applied to apparatus embodiments or system embodiments. In the description of the present application, the term "plurality" means two or more unless otherwise specified.

As shown in fig. 1, a schematic view of an application scenario applicable to the present application includes a terminal device 10 and an access network device 20, where the terminal device 10 communicates with the access network device 20 through a wireless interface.

The terminal equipment is equipment with a wireless transceiving function, can be deployed on land and comprises an indoor or outdoor, a handheld or a vehicle-mounted terminal; can also be deployed on the water surface (such as a ship and the like); and may also be deployed in the air (e.g., airplanes, balloons, satellites, etc.). The terminal may be a mobile phone (mobile phone), a tablet computer (pad), a computer with a wireless transceiving function, a Virtual Reality (VR) terminal, an Augmented Reality (AR) terminal, a wireless terminal in industrial control (industrial control), a wireless terminal in self driving (self driving), a wireless terminal in remote medical (remote medical), a wireless terminal in smart grid (smart grid), a wireless terminal in transportation safety (transportation safety), a wireless terminal in smart city (smart city), a wireless terminal in smart home (smart home), and may further include a User Equipment (UE), and the like.

An access network device, which may also be referred to as a Radio Access Network (RAN) device, is a device that provides a terminal with a wireless communication function. Access network equipment includes, for example but not limited to: next generation base stations (G nodeB, gbb), evolved node B (eNB), Radio Network Controller (RNC), Node B (NB), Base Station Controller (BSC), Base Transceiver Station (BTS), home base station (e.g., home evolved node B, or home node B), HNB (BBU), Transmission and Reception Point (TRP), Transmission Point (TP), mobile switching center, etc. in the fifth generation (5th generation, 5G).

The following presents a simplified summary of the relevant background that has arisen to facilitate an understanding of the present disclosure.

Initial access process of terminal equipment

When a terminal device needs to access a network, cell search needs to be performed first to acquire cell system information. Taking NR as an example, the concept of a synchronization Signal Broadcast Channel block (SSB) is defined in NR. One SSB occupies 4 consecutive Orthogonal Frequency Division Multiplexing (OFDM) symbols, which include a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), and a Physical Broadcast Channel (PBCH). In this process, the UE may receive a set of SSB indices at a higher layer (high layer) and provide a set of Reference Signal Reception Power (RSRP) measurements by the higher layer. The terminal equipment receives through a high layer: configuration parameters for Physical Random Access Channel (PRACH) transmission include PRACH resources (the PRACH resources may include a PRACH random access preamble (preamble) format and time-frequency resources for PARCH transmission).

As an example, the PRACH configuration parameters configured by the higher layer signaling may include part or all of the following:

-PRACH configuration index, optionally with a value of 0-255;

-format configuration information of PRACH time domain resources and sequences (determined from PRACH configuration sequence number);

PRACH Frequency domain resources (determined according to high layer configuration signaling msg1-Frequency start (indicating the starting position of the Frequency domain resources) and msg 1-Frequency-division multiplexing (FDM) (indicating the number of Frequency domain resource elements));

-PRACH transmission power.

After the cell search Procedure, the terminal device and the cell acquire downlink synchronization, and then need to establish a connection with the cell through a Random Access Procedure (Random Access Procedure) and acquire uplink synchronization. The random access process comprises the following steps:

step 1, the terminal equipment sends a preamble (Msg1), wherein the preamble is carried in PRACH;

step 2, the terminal device receives Random Access Response (RAR) (Msg2), and the information is carried in a Physical Downlink Control Channel (PDCCH) or a Physical Downlink Shared Channel (PDSCH);

step 3, the terminal device transmits Msg3 timely, the information is carried in a Physical Uplink Shared Channel (PUSCH), and then may receive the PDSCH for collision resolution (contention resolution).

The Msg2 in step 2 may carry an RAR uplink scheduling (UL grant) for scheduling the PUSCH carrying the Msg 3. As an example, the content included in the signaling may be as shown in table 1:

table 1 RAR uplink scheduling field

RAR scheduling domain (RAR grant field)	Number of bits (Number of bits)
		Frequency hopping flag	1
Msg3 PUSCH frequency resource allocation	14
		Msg3 PUSCH time resource allocation	4
MCS	4
		TPC command for Msg3 PUSCH	3
CSI request	1

And when the modulation order level corresponding to the bit field index of the MCS is 0 or 1, indicating that the PUSCH transmission adopts pi/2BPSK modulation.

Second, DMRS design

The DMRS is used for performing channel estimation when the receiving end receives the data information or the control information, and demodulates and decodes the data information or the control information to be received according to a result of the channel estimation to obtain an information bit. For example, when the terminal device transmits PUSCH, Msg3 and DMRS are typically transmitted simultaneously, so that when the access network device demodulates PUSCH, the access network device can obtain channel information of the current PUSCH transmission through DMRS for channel estimation of PUSCH. At this time, a receiving end (access network device for PUSCH transmission) needs to know the DMRS sequence so as to obtain a channel through the received DMRS and the corresponding DMRS sequence.

In NRRel-15, an uplink DMRS sequence is defined as a cyclic shift of a base sequence, and a base sequence of the uplink DMRS is obtained by cyclic extension of a Zadoff-Chu sequence (ZC sequence). The ZC sequence is a sequence that satisfies the constant amplitude auto-correlation (CAZAC) sequence property. And when the PUSCH transmission adopts DFT-s-OFDM waveform, supporting a pi/2BPSK modulation method, wherein the specific method of the pi/2BPSK modulation method is as follows:

bit b (i) is mapped to a complex-valued modulation symbol (complex-valued modulation symbol) d (i) based on the following formula:

typically, the DMRS sequence r (n) is generated based on the following formula:

wherein the content of the first and second substances,

the determination method of (1):

if it is not

With higher layer signaling configuration or PUSCH not used to carry Msg3,

and others.

The protocol defines 30 groups of sequences in advance, and it can determine which group of the 30 groups of sequences is used for transmission according to the u. When RRC connected, such as for PUSCH of msg3, the index values of the sequences cannot be configured by RRC and thus follow

Indicated by the broadcast message of the current serving cell or informed by the SIB. Since the base station cannot know whether the currently accessed UE is Rel-15 or Rel-16 before the Msg3 transmission, only the Rel-15 sequence can be adopted by default and the sequence of the sequence

And frequency domain filtering operation is adopted when pi/2BPSK modulation is supported. However, when the uplink DFT-s-OFDM waveform uses a pi/2BPSK modulation scheme and uses a filter, if a DMRS corresponding to a PUSCH for the DFT-s-OFDM waveform uses a ZC sequence, the PAPR of the DMRS is higher than the PAPR of transmission data, which causes pilot signal outband spurious emission and inband signal loss, affects channel estimation performance, or causes uplink coverage to be limited. That is, the sequences used in the conventional DMRS for the PDSCH cannot satisfy the communication application environment in which signals are transmitted using the PUSCH at present. Based on this, Rel-16 adopts a CGS or Gold sequence which has the property of low PAPR (equivalent to pi/2BPSK modulated data), thereby solving the problem brought by adopting a ZC sequence for the DMRS in Rel-15.

Considering that the DMRS sequence of Rel-15 adopts a ZC sequence, there is the above-mentioned problem of high PAPR, and further, if the PUSCH of Msg3 adopts pi/2BPSK modulation, the PAPR of DMRS is much higher than that of data, which makes the problem of high PAPR of DMRS more serious.

Third, DMRS sequence

In the present application, the DMRS sequences referred to include ZC sequences, CGS sequences and Gold sequences. The CGS sequence is pi/2BPSK sequence, or 8Phase Shift Keying (8 PSK) modulated sequence.

The ZC sequence is:

for ZC sequence length

The sequence of the motif is

Wherein the content of the first and second substances,

for ZC sequence length M_ZCIs e {6,12,18,24}, and the sequence of the motif is listed as

0≤n≤M_ZC-1

TABLE 1-1

Tables 1 to 2

Tables 1 to 3

Tables 1 to 4

After QPSK modulation, the sequence is subjected to IFFT conversion to a time domain and a cyclic prefix CP to form a DMRS signal

For the CGS sequence, after pi/2BPSK modulation or 8PSK modulation, FFT is carried out on the CGS sequence, the CGS sequence is transformed into a frequency domain, after filtering, IFFT is carried out on the CGS sequence, and the CGS sequence is transformed into a time domain and a cyclic prefix CP to form a DMRS signal.

For Gold sequences, the base sequence r (n) is

Wherein c (i) is

The sequence is subjected to IFFT conversion to a time domain and a Cyclic Prefix (CP) to form a DMRS signal

Based on the above background, the technical problem to be solved by the present application is: how a terminal device selects a DMRS sequence, and how an access network device determines the DMRS sequence used by the terminal device to facilitate channel estimation based on the DMRS.

To solve the above problem, as shown in fig. 2, the present application provides a communication method, including the steps of:

step 201, the terminal device determines the DMRS sequence of the PUSCH.

Here, the DMRS sequence may be a sequence of a DMRS of a PUSCH carrying Msg 3.

For example, the terminal device supports the DMRS sequence to include a first DMRS sequence, or the terminal device supports the DMRS sequence to include the first DMRS sequence and a second DMRS sequence. Wherein the first DMRS sequence is a frequency domain sequence (such as a ZC sequence) and the second DMRS sequence is a time domain sequence (such as a CGS or a Gold sequence).

As an alternative implementation manner of this step 201, the terminal device determines a DMRS sequence of an uplink channel, where the uplink channel may be, for example, a PUSCH, or may also be another uplink channel.

Step 202, the terminal equipment determines the PRACH resource according to the determined DMRS sequence.

For example, the terminal device may determine the PRACH resource according to the determined parameter of the DMRS sequence (e.g., a reference number, a sequence number, an ID, or other parameter of the DMRS sequence). Other parameters here may be one or more cell identifications (cell IDs) configured by the access network equipment.

As an alternative implementation of this step 202, the terminal device determines the PRACH resource of the DMRS sequence.

As a further alternative implementation of this step 202, the terminal device determines a PRACH resource, which is associated with the DMRS sequence.

Step 203, the terminal equipment sends a preamble on the PRACH resource.

According to the foregoing description, after sending preamble, the terminal device may receive RAR (carrying Msg2), and then the terminal device sends PUSCH carrying Msg3 and DMRS to the access network device, where the DMRS sequence is the DMRS sequence determined in step 201 above. Or, the terminal equipment transmits the DMRS of the PUSCH according to the determined DMRS sequence.

Optionally, the PUSCH carrying Msg3 is pi/2BPSK modulation.

Step 204, the access network device detects the PRACH resource of the terminal device and determines the PRACH resource carrying the preamble.

Through the foregoing description, before the terminal device sends the preamble, the access network device sends, to the terminal device, PRACH resources (which may be multiple sets of PRACH resources) available to the terminal device through a high layer, so that a subsequent terminal device will send the preamble on the PRACH resources. Therefore, the access network device performs detection on the PRACH resource to determine the PRACH resource carrying the preamble.

For example, the PRACH resources sent by the access network device to the terminal device include PRACH resource 1, PRACH resource 2, and PRACH resource 3, and the terminal device bears the preamble on the PRACH resource 2, so the access network device may sequentially detect the PRACH resource 1, the PRACH resource 2, and the PRACH resource 3 according to a preset rule, for example, according to an order of the PRACH resource 1, the PRACH resource 2, and the PRACH resource 3, until the preamble is detected. Therefore, when the access network device detects PRACH resource 2, it may determine that the PRACH resource carrying the preamble is PRACH resource 2, and at this time, it may not need to detect PRACH resource 3 again. The PRACH resources 1, 2, and 3 are different resources.

Step 205, the access network device determines the DMRS sequence of the PUSCH of the terminal device according to the PRACH resource carrying the preamble.

For example, the access network device is preconfigured with a correspondence between a DMRS sequence and a PRACH resource, or a correspondence between a protocol predefined DMRS sequence and a PRACH resource, and the access network device may determine, according to the correspondence, a DMRS sequence corresponding to a PRACH resource that carries a preamble.

Optionally, the following step 206 is also included.

And step 206, the access network equipment acquires the Msg3 loaded by the PUSCH according to the DMRS sequence.

That is, the access network device may obtain the DMRS sequence carried by the PUSCH by using the determined DMRS sequence, and further obtain channel information transmitted by the current PUSCH for channel estimation of the PUSCH according to the DMRS sequence, and further obtain the Msg3 carried by the PUSCH.

Based on the scheme, when the terminal equipment supports a plurality of DMRS sequences, the terminal equipment can select one DMRS sequence, namely the DMRS sequence is determined, and the access network equipment can acquire the DMRS sequence determined by the terminal equipment, so that normal communication can be kept between the terminal equipment and the access network equipment.

As an example, two specific implementation methods are given below for the above step 201 and step 202.

Method one, pre-configuration or protocol pre-definition of corresponding relation between DMRS sequence and PRACH resource

In one implementation manner, the terminal device receives configuration information of PRACH resources configured by the access network device, and determines, from the PRACH resources configured by the access network device, a PRACH resource corresponding to a DMRS sequence.

For example, multiple sets of the same configuration parameter of the PRACH resource may be configured, and the configuration parameter may be a format (format) of the PRACH resource, a sequence of the PRACH resource, a time domain resource of the PRACH resource, a frequency domain resource of the PRACH resource, and power for transmitting a preamble on the PRACH resource. For example, one may be added after each of the configuration parameters: a type of DMRS sequence. Taking the time domain resource in the configuration parameter as an example, if the table entry of the time domain resource is shown in table 2, an entry may be added after table 2: a type of DMRS sequence.

TABLE 2 time domain resource configuration for PRACH

For another example, more than 2 sets of PRACH resource configuration parameter sets RACH-ConfigGeneric IE are configured, and one RACH-ConfigGeneric IE corresponds to one PRACH resource. For example, an entry may be added to the IE: a type of DMRS sequence.

As an example, table 2-1 gives one example of a correspondence of DMRS sequences to PRACH resources.

TABLE 2-1

In the example of table 2-1, the PRACH resource is divided into PRACH resource 1-PRACH resource 5, and the first DMRS sequence corresponds to PRACH resource 1, PRACH resource 2, and PRACH resource 3, and the second DMRS sequence corresponds to PRACH resource 4 and PRACH resource 5. For example, when the terminal device supports only the first DMRS sequence, it is determined that some or all of PRACH resource 1, PRACH resource 2, and PRACH resource 3 may be used. For another example, when the terminal device supports both the first DMRS sequence and the second DMRS sequence, the terminal device preferentially uses the second DMRS sequence, and thus determines that some or all of PRACH resource 4 and PRACH resource 5 may be used.

It should be noted that the PRACH resources 1 to 5 are different resources, and one PRACH resource may further include multiple PRACH resources. For example, PRACH resource 1 includes multiple PRACH resources, PRACH resource 2 includes multiple PRACH resources, and so on.

As an example, table 2-2 gives yet another example of a correspondence of DMRS sequences to PRACH resources.

Tables 2 to 2

In the example of table 2-2 above, the PRACH resource is divided into PRACH resource 1 and PRACH resource 2, and the first DMRS sequence corresponds to PRACH resource 1, and the second DMRS sequence corresponds to PRACH resource 2. For example, when the terminal device supports only the first DMRS sequence, it is determined that PRACH resource 1 may be used. For another example, when the terminal device supports both the first DMRS sequence and the second DMRS sequence, the terminal device preferentially uses the second DMRS sequence, and thus determines that PRACH resource 2 may be used.

It should be noted that the PRACH resources 1 to 2 are different resources, and one PRACH resource may further include multiple PRACH resources. For example, PRACH resource 1 includes multiple PRACH resources, and PRACH resource 2 includes multiple PRACH resources.

In the first implementation method, the terminal device pre-configures or pre-defines the corresponding relationship between the DMRS sequence and the PRACH resource by a protocol, and the access network device also pre-configures or pre-defines the same corresponding relationship by a protocol. In this way, in step 205, the access network device may determine the DMRS sequence used by the terminal device according to the determined PRACH resource carrying the preamble and the corresponding relationship.

The following is a detailed description of the manner of establishing the correspondence relationship.

The access network equipment can configure a plurality of PRACH resources for the terminal equipment through a high layer so as to be used for sending the preamble. For example, the plurality of PRACH resources may be implemented by configuring a plurality of PRACH configuration indexes, or may be implemented by defining a plurality of RACH-ConfigGeneric IEs in Radio Resource Control (RRC), where each RACH-ConfigGeneric IE contains configuration parameters required for PRACH transmission.

The method for establishing the corresponding relationship between the PRACH resource and the DMRS sequence may be one of the following two methods, but is not limited to the following two methods:

1) the corresponding relation can be determined in a protocol predefined manner, for example, the PRACH is configured with corresponding indexes, the PRACH configuration index group 1 corresponds to a Rel-15DMRS sequence (i.e., a first DMRS sequence), the PRACH configuration index group 2 corresponds to a Rel-16DMRS sequence (i.e., a second DMRS sequence), and when the RRC notifies the PRACH configuration index, the DMRS sequence corresponding to the configuration index is notified at the same time; alternatively, each RACH-ConfigGeneric defines a corresponding DMRS sequence, and one RACH-ConfigGeneric defines one PRACH resource.

2) The corresponding relationship may also be notified by the access network device, and the notification of the corresponding relationship may be carried in a System Information Block (SIB) message or a PBCH message, which is a specific notification manner: newly adding a configuration parameter in RACH-ConfigGeneric for indicating a DMRS sequence of Msg 3; or, based on the indicated PRACH resource, further indicating a DMRS sequence of Msg3 corresponding to each PRACH resource.

Based on the definition of the corresponding relation, the access network equipment and the terminal equipment perform the following operations to achieve the use consensus of the DMRS sequence: the terminal equipment can determine the PRACH resource for preamble transmission according to whether the terminal equipment supports the Rel-16DMRS sequence or not and according to the corresponding relation between the PRACH resource and the DMRS sequence type. Taking table 2-2 above as an example, if the terminal device supports Rel-16DMRS, the terminal device selects PRACH resource 2 to send preamble, the access network device will detect PRACH resource 1 and resource 2, and if the preamble of the terminal device is received on PRACH resource 2, it is considered that the DMRS sent by the terminal device Msg3 adopts Rel-16DMRS sequence, which is helpful to ensure that the DMRS of Msg3 has the characteristic of low PAPR, and improve uplink coverage.

And the corresponding relation among the DMRS sequence, the RSRP grade and the PRACH resource is predefined by pre-configuration or protocol, wherein the RSRP grade and the RSRP measured by the terminal equipment have an incidence relation. The RSRP measured by the terminal device may be obtained by the terminal device measuring a received signal (e.g., Msg2, PBCH, SSB, or other downlink path loss reference signal (downlink path loss reference)), so as to obtain the RSRP.

As an example, table 3 gives one example of a correspondence of RSRP levels to RSRP.

TABLE 3

RSRP rating	RSRP
		RSRP level 1	RSRP>＝X1
RSRP level 2	X2<＝RSRP<X1
		RSRP level 3	X3<＝RSRP<X2
RSRP level 4	RSRP<X3

Wherein, X1> X2> X3, here X1, X2, X3 can be understood as different thresholds. "> ═ means greater than or equal to, and" < ═ means less than or equal to.

Table 3 above divides RSRP levels into 4 levels, wherein the larger the RSRP value, the lower the RSRP level. Conversely, the smaller the value of RSRP, the higher the RSRP level.

Therefore, based on table 3, when the terminal device measures the signal to obtain RSRP, the section to which the RSRP belongs can be determined, and the RSRP level can be determined. For example, if the terminal device measures RSRP1 and X2< ═ RSRP1< X1, the RSRP level is determined to be RSRP level 2.

Further, the terminal device also pre-configures or pre-defines a corresponding relation among the DMRS sequence, the RSRP level, and the PRACH resource.

As an example, table 4 gives an example of the correspondence relationship among DMRS sequences, RSRP levels, and PRACH resources.

TABLE 4

In step 201, the determining, by the terminal device, the DMRS sequence of the PUSCH includes: the terminal equipment measures signals to obtain RSRP, then determines the RSRP grade corresponding to the RSRP, and then determines the DMRS sequence of the PUSCH according to the RSRP grade.

The terminal equipment measures signals and obtains RSRP is an optional step. The terminal equipment can also directly acquire the RSRP.

It can be understood that the terminal device determines the DMRS sequence to have an association relationship with the RSRP level. Or, in other words, the terminal device determines a DMRS sequence corresponding to the RSRP level.

For example, the RSRP level is a first level (e.g., RSRP level 1 or RSRP level 2 in table 4), the terminal device determines that the DMRS sequence of the PUSCH is the first DMRS sequence. For another example, if the RSRP level is the second level (e.g., RSRP level 3 or RSRP level 4 in table 4) and the terminal device supports the second DMRS sequence, the terminal device determines the DMRS sequence of the PUSCH as the second DMRS sequence. For another example, if the RSRP level is the second level (e.g., RSRP level 3 or RSRP level 4 in table 4) and the terminal device does not support the second DMRS sequence, the terminal device determines the DMRS sequence of the PUSCH as the first DMRS sequence.

If the determined DMRS sequence is the first DMRS sequence and the RSRP level is the first level, the terminal device determines that the PRACH resource is the first PRACH resource (for example, PRACH resource 1 or PRACH resource 2 in table 4); alternatively, the first and second electrodes may be,

if the determined DMRS sequence is the first DMRS sequence and the RSRP level is the second level, the terminal device determines that the PRACH resource is the second PRACH resource (for example, PRACH resource 3 or PRACH resource 4 in table 4); alternatively, the first and second electrodes may be,

if the determined DMRS sequence is the second DMRS sequence and the RSRP level is the second level, the terminal device determines that the PRACH resource is the third PRACH resource (for example, PRACH resource 5 or PRACH resource 6 in table 4).

Wherein the first PRACH resource, the second PRACH resource, and the third PRACH resource are different.

The following is a detailed description with reference to table 4. For example, the terminal device measures the synchronization signal, and determines that the DMRS sequence is the first DMRS sequence if the obtained RSRP corresponds to an RSRP level 1. For another example, the terminal device measures the synchronization signal, and the obtained RSRP corresponds to an RSRP level 3, the terminal device further determines whether the second DMRS sequence is supported, determines that the DMRS sequence is the second DMRS sequence if the second DMRS sequence is supported, and determines that the DMRS sequence is the first DMRS sequence if the second DMRS sequence is not supported.

The access network device may be preconfigured or protocol predefined with a correspondence between DMRS sequences and PRACH resources. For example, if the terminal device stores the correspondence shown in table 4, the access network device may store the correspondence shown in table 5 below.

TABLE 5

Therefore, after determining the PRACH resource carrying the preamble, the access network device may further determine the DMRS sequence corresponding to the PRACH resource.

In the second implementation method, the definition manner of the corresponding relationship (for example, table 4) in the terminal device may refer to the first implementation method, for example: the access network equipment can configure a plurality of PRACH resources for sending the preamble, and the plurality of PRACH resources can be realized by configuring a plurality of PRACH configuration indexes; it may also be implemented by defining multiple RACH-ConfigGeneric IEs in RRC, where each RACH-ConfigGeneric contains configuration parameters needed for PRACH transmission. The corresponding relation can be determined in a protocol predefined mode or in a mode notified by the access network equipment. Each PRACH resource may be bound to one RSRP level, and the terminal device may determine the PRACH resource to be used according to the RSRP level.

Based on the definition of the corresponding relation, the access network equipment and the terminal equipment perform the following operations to achieve the use consensus of the DMRS sequence: the terminal equipment determines PRACH resources according to whether the terminal equipment can support Rel-16DMRS sequences and RSRP obtained by previous signal measurement.

Optionally, it may be further constrained: a Rel-16DMRS sequence (CGS) is used when the PUSCH of Msg3 is pi/2BPSK modulated, so according to table 4 above, if the RSRP level is determined to be RSRP level 3 or RSRP level 4, and the PUSCH of Msg3 is determined to be pi/2BPSK modulated, the DMRS sequence is determined to be CGS; and if the RSRP level is determined to be the RSRP level 3 or the RSRP level 4 and the PUSCH of the Msg3 is not modulated by pi/2BPSK, determining that the DMRS sequence is the first DMRS sequence.

By establishing the corresponding relation among the PRACH resource, the DMRS sequence and the RSRP grade, the Rel-16 terminal equipment can adopt the Rel-16DMRS sequence to send the DMRS of the Msg 3. Considering that the RSRP level represents the channel condition of transmission, when the RSRP is low (the corresponding RSRP level is high at this time), it represents that the terminal device is at the cell edge, and at this time, it is desirable to adopt a Rel-16DMRS sequence to increase uplink coverage; when the RSRP is high (at this time, the corresponding RSRP level is low), it is characterized that the terminal device is in the center of the cell, and at this time, the terminal device may adopt a Rel-15DMRS sequence. And according to the defined corresponding relation and the PRACH resource for receiving the preamble, the access network equipment can know the DMRS sequence adopted by the terminal equipment, thereby being beneficial to ensuring that the DMRS of the Msg3 has the characteristic of low PAPR and improving the uplink coverage.

Since there is a correspondence between the coverage enhancement level (CE level) and the RSRP level, the RSRP level in the correspondence may be replaced by the coverage enhancement level. For example, the above table 4 stores the correspondence between the DMRS sequence, the coverage enhancement level, and the PRACH resource. The terminal equipment determines a coverage enhancement grade according to the RSRP, determines a DMRS sequence according to the coverage enhancement grade, and determines the PRACH resource according to the coverage enhancement grade and the DMRS sequence.

Fig. 3 shows a possible exemplary block diagram of a communication device according to an embodiment of the present invention, which communication device 300 may be in the form of software or hardware. The communication device 300 may include: a processing unit 301, a transmitting unit 302 and a receiving unit 303. The processing unit 301 is used for controlling and managing the operation of the communication device 300. The sending unit 302 and the receiving unit 303 are used to support communication of the communication device 300 with other network entities.

The processing unit may be a processor or a controller, and may be, for example, a general-purpose Central Processing Unit (CPU), a general-purpose processor, a Digital Signal Processing (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, modules, 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 transmitting unit 302 may be a communication interface, a transmitter or a transmitting circuit, etc., and the receiving unit 302 may be a communication interface, a receiver or a receiving circuit, etc.

The communication device 300 may be a terminal device in any of the above embodiments, and may also be a chip that can be used for a terminal device. For example, when the communication apparatus 300 is a terminal device, the processing unit 301 may be a processor, the transmitting unit 302 may be a transmitter including a radio frequency circuit, and the receiving unit 303 may be a receiver including a radio frequency circuit. For example, when the communication apparatus 300 is a chip usable for a terminal device, the processing unit 301 may be a processor, the transmitting unit 302 may be an output interface, a pin, a circuit, or the like, and the receiving unit 303 may be an input interface, a pin, a circuit, or the like.

In one embodiment, the device comprises a processing unit, a demodulation reference signal (DMRS) sequence determining unit, a demodulation processing unit and a demodulation processing unit, wherein the DMRS sequence is used for determining a Physical Uplink Shared Channel (PUSCH); and determining Physical Random Access Channel (PRACH) resources according to the DMRS sequence; and the sending unit is used for sending a random access preamble on the PRACH resource.

In a possible implementation method, the transmitting unit is further configured to transmit the DMRS of the PUSCH according to the DMRS sequence.

In a possible implementation method, the receiving unit is configured to receive configuration information of PRACH resources configured by an access network device; the processing unit is specifically configured to determine, from PRACH resources configured by the access network device, the PRACH resource corresponding to the DMRS sequence.

In one possible implementation method, the device is preconfigured with a correspondence between the DMRS sequence and the PRACH resource, or a protocol predefines the correspondence between the DMRS sequence and the PRACH resource.

In a possible implementation method, the processing unit is specifically configured to: measuring a signal, and determining signal received power (RSRP); determining an RSRP level corresponding to the RSRP; and determining the DMRS sequence according to the RSRP level.

In a possible implementation method, the processing unit is specifically configured to: the RSRP grade is a first grade, and the DMRS sequence of the PUSCH is determined to be a first DMRS sequence; or the RSRP grade is a second grade, the terminal equipment supports a second DMRS sequence, and the DMRS sequence of the PUSCH is determined to be the second DMRS sequence; or, the RSRP grade is a second grade, the terminal equipment does not support a second DMRS sequence, and the DMRS sequence of the PUSCH is determined to be a first DMRS sequence; wherein the RSRP corresponding to the first level is greater than the RSRP corresponding to the second level.

In a possible implementation method, the processing unit is specifically configured to: the DMRS sequence is a first DMRS sequence, the RSRP grade is the first grade, and the PRACH resource is determined to be a first PRACH resource; or, the DMRS sequence is a first DMRS sequence, the RSRP level is the second level, and the PRACH resource is determined to be a second PRACH resource; or, the DMRS sequence is a second DMRS sequence, the RSRP level is the second level, and the PRACH resource is determined to be a third PRACH resource; wherein the first PRACH resource, the second PRACH resource, and the third PRACH resource are different.

Specific beneficial effects of the communication method executed by the communication apparatus shown in fig. 3 can refer to the related descriptions in the foregoing method embodiments, and are not described herein again. It is to be understood that the units in the embodiments of the present application may also be referred to as modules. The units or modules may be independent or integrated together.

Fig. 4 shows a possible exemplary block diagram of a communication device involved in an embodiment of the present invention, which communication device 400 may be in the form of software or hardware. The communication apparatus 400 may include: processing unit 401, transmitting unit 402 and receiving unit 403. The processing unit 401 is configured to control and manage operations of the communication apparatus 400. The sending unit 402 and the receiving unit 403 are used to support communication of the communication apparatus 400 with other network entities.

The processing unit may be a processor or a controller, and may be, for example, a general-purpose Central Processing Unit (CPU), a general-purpose processor, a Digital Signal Processing (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, modules, 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 transmitting unit 402 may be a communication interface, a transmitter or a transmitting circuit, etc., and the receiving unit 402 may be a communication interface, a receiver or a receiving circuit, etc.

The communication device 400 may be an access network device in any of the above embodiments, and may also be a chip that can be used for the access network device. For example, when the communication apparatus 400 is an access network device, the processing unit 401 may be a processor, the transmitting unit 402 may be a transmitter including radio frequency circuits, and the receiving unit 403 may be a receiver including radio frequency circuits. For example, when the communication apparatus 400 is a chip that can be used in an access network device, the processing unit 401 may be a processor, the transmitting unit 402 may be an output interface, pin, circuit, or the like, and the receiving unit 403 may be an input interface, pin, circuit, or the like.

In one embodiment, the processing unit is configured to detect a PRACH resource of a terminal device, and determine the PRACH resource carrying a preamble; and determining the DMRS sequence of the PUSCH of the terminal equipment according to the PRACH resource carrying the preamble.

In a possible implementation method, the processing unit is further configured to obtain, according to the DMRS, an MSG3 carried on the PUSCH.

Specific beneficial effects of the communication method executed by the communication apparatus shown in fig. 4 can refer to the related descriptions in the foregoing method embodiments, and are not described herein again. It is to be understood that the units in the embodiments of the present application may also be referred to as modules. The units or modules may be independent or integrated together.

Referring to fig. 5, a schematic diagram of a communication apparatus provided in the present application is shown, where the communication apparatus may be a terminal device or an access network device in the embodiment of the present application, and may also be a component of the terminal device or a component of the access network device. The communication device 500 includes: a processor 502, a communication interface 503, and a memory 501. Optionally, the communication device 500 may also include a bus 504. Wherein, the communication interface 503, the processor 502 and the memory 501 may be connected to each other through a communication line 504; the communication line 504 may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The communication lines 504 may be divided into address buses, data buses, control buses, and the like. For ease of illustration, only one thick line is shown in FIG. 5, but this is not intended to represent only one bus or type of bus.

Processor 502 may be a CPU, microprocessor, ASIC, or one or more integrated circuits configured to control the execution of programs in accordance with the teachings of the present application.

The communication interface 503 may be any device using a transceiver or the like for communicating with other devices or communication networks, such as ethernet, Radio Access Network (RAN), Wireless Local Area Network (WLAN), wired access network, etc.

The memory 501 may be, but is not limited to, a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a Random Access Memory (RAM) or other type of dynamic storage device that can store information and instructions, an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compact disc, laser disc, optical disc, digital versatile disc, blu-ray disc, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. The memory may be separate and coupled to the processor via a communication line 504. The memory may also be integral to the processor.

The memory 501 is used for storing computer-executable instructions for executing the present application, and is controlled by the processor 502 to execute. The processor 502 is configured to execute computer-executable instructions stored in the memory 501, so as to implement the communication method provided by the above-mentioned embodiment of the present application.

Optionally, the computer-executable instructions in the embodiments of the present application may also be referred to as application program codes, which are not specifically limited in the embodiments of the present application.

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

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

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

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

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

Claims

1. A method of communication, comprising:

terminal equipment determines a demodulation reference signal (DMRS) sequence of a Physical Uplink Shared Channel (PUSCH);

the terminal equipment determines physical random access channel PRACH resources according to the DMRS sequence;

the terminal equipment sends a random access preamble on the PRACH resource;

the terminal device stores the corresponding relation between the DMRS sequence and the PRACH resource pre-configured by the access network device, or the corresponding relation between the DMRS sequence and the PRACH resource pre-defined by a protocol.

2. The method of claim 1, wherein the DMRS sequence is a sequence of a DMRS of a PUSCH carrying Msg 3.

3. The method of claim 1, further comprising:

and the terminal equipment transmits the DMRS of the PUSCH according to the DMRS sequence.

4. The method of any of claims 1-3, further comprising:

the terminal equipment receives configuration information of PRACH resources configured by the access network equipment;

the terminal equipment determines PRACH resources according to the DMRS sequence, and the determination comprises the following steps:

and the terminal equipment determines the PRACH resource corresponding to the DMRS sequence from the PRACH resource configured by the access network equipment.

5. The method of any of claims 1-3, wherein the terminal device determining the DMRS sequence for PUSCH comprises:

the terminal equipment measures signals and determines signal receiving power (RSRP);

the terminal equipment determines an RSRP grade corresponding to the RSRP;

and the terminal equipment determines the DMRS sequence according to the RSRP grade.

6. The method of claim 5, wherein the terminal device determines the DMRS sequence for PUSCH according to the RSRP level, comprising:

the RSRP grade is a first grade, and the terminal equipment determines that the DMRS sequence of the PUSCH is a first DMRS sequence; alternatively, the first and second electrodes may be,

the RSRP grade is a second grade, the terminal equipment supports a second DMRS sequence, and the terminal equipment determines that the DMRS sequence of the PUSCH is the second DMRS sequence; alternatively, the first and second electrodes may be,

and the RSRP grade is a second grade, the terminal equipment does not support a second DMRS sequence, and the terminal equipment determines that the DMRS sequence of the PUSCH is a first DMRS sequence.

7. The method of claim 6, wherein the determining, by the terminal device, the PRACH resource based on the DMRS sequence comprises:

the DMRS sequence is a first DMRS sequence, the RSRP grade is the first grade, and the terminal equipment determines that the PRACH resource is a first PRACH resource; alternatively, the first and second electrodes may be,

the DMRS sequence is a first DMRS sequence, the RSRP grade is the second grade, and the terminal equipment determines that the PRACH resource is a second PRACH resource; alternatively, the first and second electrodes may be,

the DMRS sequence is a second DMRS sequence, the RSRP grade is the second grade, and the terminal equipment determines that the PRACH resource is a third PRACH resource;

8. The method of any one of claims 1-3, 6-7, wherein the DMRS sequence is a first DMRS sequence that is a frequency domain sequence, or a second DMRS sequence that is a time domain sequence.

9. The method of claim 8, wherein the first DMRS sequence is a ZC sequence, the second DMRS sequence is a computer-generated sequence, CGS, or a Gold sequence.

10. A method of communication, comprising:

the access network equipment detects the PRACH resource of the terminal equipment and determines the PRACH resource bearing preamble;

the access network equipment determines a DMRS sequence of a PUSCH of the terminal equipment according to the PRACH resource bearing the preamble;

wherein the access network equipment is preconfigured with the corresponding relation between the DMRS sequence and the PRACH resource or a protocol predefines the corresponding relation between the DMRS sequence and the PRACH resource.

11. The method of claim 10, wherein the DMRS sequence is a sequence of a DMRS of a PUSCH carrying Msg 3.

12. The method of claim 10, wherein the DMRS sequence is a first DMRS sequence, which is a frequency domain sequence, or a second DMRS sequence, which is a time domain sequence.

13. The method of claim 12, wherein the first DMRS sequence is a ZC sequence, the second DMRS sequence is a computer-generated sequence, CGS, or a Gold sequence.

14. A terminal device, comprising:

the processing unit is used for determining a demodulation reference signal (DMRS) sequence of a Physical Uplink Shared Channel (PUSCH); and determining Physical Random Access Channel (PRACH) resources according to the DMRS sequence;

a sending unit, configured to send a random access preamble on the PRACH resource;

15. The terminal device of claim 14, wherein the DMRS sequence is a sequence of a DMRS carrying a PUSCH of Msg 3.

16. The terminal device of claim 14, wherein the transmitting unit is further configured to transmit the DMRS for the PUSCH in accordance with the DMRS sequence.

17. The terminal device according to any of claims 14-16, wherein the terminal device further comprises a receiving unit, configured to receive configuration information of PRACH resources configured by an access network device;

the processing unit is specifically configured to determine, from PRACH resources configured by the access network device, the PRACH resource corresponding to the DMRS sequence.

18. The terminal device according to any one of claims 14 to 16, wherein the processing unit is specifically configured to:

measuring a signal, and determining signal received power (RSRP);

determining an RSRP level corresponding to the RSRP;

and determining the DMRS sequence according to the RSRP level.

19. The terminal device of claim 18, wherein the processing unit is specifically configured to:

the RSRP grade is a first grade, and the DMRS sequence of the PUSCH is determined to be a first DMRS sequence; alternatively, the first and second electrodes may be,

the RSRP grade is a second grade, the terminal equipment supports a second DMRS sequence, and the DMRS sequence of the PUSCH is determined to be the second DMRS sequence; alternatively, the first and second electrodes may be,

and the RSRP grade is a second grade, the terminal equipment does not support a second DMRS sequence, and the DMRS sequence of the PUSCH is determined to be a first DMRS sequence.

20. The terminal device of claim 19, wherein the processing unit is specifically configured to:

the DMRS sequence is a first DMRS sequence, the RSRP grade is the first grade, and the PRACH resource is determined to be a first PRACH resource; alternatively, the first and second electrodes may be,

the DMRS sequence is a first DMRS sequence, the RSRP grade is the second grade, and the PRACH resource is determined to be a second PRACH resource; alternatively, the first and second electrodes may be,

the DMRS sequence is a second DMRS sequence, the RSRP level is the second level, and the PRACH resource is determined to be a third PRACH resource;

21. The terminal device of any of claims 14-16, 19-20, wherein the DMRS sequence is a first DMRS sequence, the first DMRS sequence being a frequency domain sequence, or a second DMRS sequence, the second DMRS sequence being a time domain sequence.

22. The terminal device of claim 21, wherein the first DMRS sequence is a ZC sequence, the second DMRS sequence is a computer-generated sequence, CGS, or a Gold sequence.

23. An access network device, comprising:

the processing unit is used for detecting the PRACH resource of the terminal equipment and determining the PRACH resource bearing preamble; and determining a DMRS sequence of a PUSCH of the terminal equipment according to the PRACH resource bearing the preamble;

24. The access network device of claim 23, wherein the DMRS sequence is a sequence of DMRS carrying PUSCH of Msg 3.

25. The access network device of claim 23, wherein the DMRS sequence is a first DMRS sequence that is a frequency domain sequence or a second DMRS sequence that is a time domain sequence.

26. The access network device of claim 25, wherein the first DMRS sequence is a ZC sequence, the second DMRS sequence is a computer generated sequence, CGS, or a Gold sequence.