CN111885739A

CN111885739A - Random access method and device thereof

Info

Publication number: CN111885739A
Application number: CN201910370990.0A
Authority: CN
Inventors: 行双双; 吴艺群; 徐修强
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2019-05-01
Filing date: 2019-05-01
Publication date: 2020-11-03
Anticipated expiration: 2039-05-01
Also published as: WO2020221327A8; CN111885739B; WO2020221327A1

Abstract

The embodiment of the application discloses a random access method and a device for realizing the method. The method comprises the following steps: the method comprises the steps that terminal equipment sends random access information to network equipment, wherein the random access information comprises a random access lead code and a Physical Uplink Shared Channel (PUSCH); the terminal equipment monitors a first Physical Downlink Control Channel (PDCCH) according to a scrambling code in a preset scrambling code set, wherein the first PDCCH is used for scheduling a first Physical Downlink Shared Channel (PDSCH) carrying a first response message aiming at a PUSCH; and the terminal equipment receives the first PDSCH according to the monitored first PDCCH. By implementing the embodiment of the application, the terminal equipment can successfully obtain the PDSCH scheduled by the PDCCH.

Description

Random access method and device thereof

Technical Field

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

Background

The random access procedure refers to a procedure from a user sending a random access Preamble (Preamble) to a network before a basic signaling connection is established between the user and the network, and the random access procedure has two types: contention random access and non-contention random access. In the contention random access process, there are three Radio Resource Control (RRC) states supported by the terminal device: RRC idle state, RRC inactive state, and RRC connected state.

When the terminal device is in the RRC idle state or the RRC inactive state, the process of four-step random access is as shown in fig. 1 a: the method comprises the steps that terminal equipment sends Msg1 to network equipment through a Physical Random Access Channel (PRACH), wherein Msg1 comprises Preamble; after receiving the Preamble, the Network device generates a Random Access Response (RAR) for the Preamble and transmits the RAR (i.e., Msg2), where the RAR is carried on a first Physical Downlink Shared Channel (PDSCH), the first PDSCH is scheduled by a first Physical Downlink Control Channel (PDCCH), the RAR carries a Temporary Cell Radio Network Temporary Identifier (TC-RNTI), and the first PDCCH is scrambled by a Random Access Radio Network Temporary Identifier (RA-RNTI); after the terminal device sends a Preamble, if a first PDCCH scrambled by an RA-RNTI is monitored, receiving a first PDSCH according to the monitored first PDCCH, demodulating the first PDSCH to obtain an RAR carried on the first PDSCH, and then sending Msg3 to the network device, wherein Msg3 is carried on a Physical Uplink Shared Channel (PUSCH); after receiving the PUSCH sent by the terminal device, the network device generates a response (i.e., Msg4) for the PUSCH, where the response for the PUSCH is carried on the second PDSCH, the second PDSCH is scheduled by the second PDCCH, the second PDCCH is scrambled by the TC-RNTI, the response for the PUSCH may include a terminal Contention Resolution Identity (CRID), and the terminal device may determine whether Contention access is successful according to the CRID; after sending the PUSCH, if monitoring a second PDCCH scrambled by a TC-RNTI, the terminal equipment receives a second PDSCH according to the monitored second PDCCH and demodulates the second PDSCH, thereby obtaining a CRID loaded on the second PDSCH, and determining whether contention access is successful according to the CRID.

However, in some scenarios (such as a two-step random access procedure or other scenarios), the terminal device cannot obtain the TC-RNTI configured for the terminal device, and taking the flow diagram of the two-step random access shown in fig. 1b as an example, in the two-step random access procedure, the terminal device may simultaneously send the Preamble and the PUSCH, and after receiving the Preamble and the PUSCH, the network device may generate a response (RAR) for the Preamble and a response for the PUSCH, and carry the RAR and the response for the PUSCH on the PDSCH for sending, and send the PDCCH for scheduling the PDSCH, where the PDCCH may be scrambled using the TC-RNTI.

As shown in fig. 1b, when the terminal device is in the RRC idle state or the RRC inactive state, the terminal device cannot obtain the TC-RNTI configured for the terminal device in advance, and cannot monitor the PDCCH scrambled by the TC-RNTI, so that the terminal device cannot obtain the PDSCH scheduled by the PDCCH.

Disclosure of Invention

The embodiment of the application provides a random access method and a device thereof, which are beneficial for terminal equipment to successfully obtain a PDSCH scheduled by a PDCCH.

In a first aspect, an embodiment of the present application provides a random access method, where the method includes: the method comprises the steps that terminal equipment sends random access information to network equipment, wherein the random access information comprises a random access lead code and a Physical Uplink Shared Channel (PUSCH); the terminal equipment monitors a first Physical Downlink Control Channel (PDCCH) according to a scrambling code in a preset scrambling code set, wherein the first PDCCH is used for scheduling a first Physical Downlink Shared Channel (PDSCH) carrying a first response message aiming at a PUSCH; and the terminal equipment receives the first PDSCH according to the monitored first PDCCH.

In the technical scheme, the preset scrambling code set may be predetermined by the network device and the terminal device, if the network device generates the first response information for the PUSCH, the first PDCCH for scheduling the first PDSCH carrying the first response information is scrambled by using the scrambling code in the preset scrambling code set, and the terminal device monitors the first PDCCH according to the scrambling code in the preset scrambling code set, so that the terminal device may successfully monitor the first PDCCH sent by the network device, thereby facilitating the terminal device to successfully obtain the first PDSCH scheduled by the first PDCCH.

In an implementation manner, the PUSCH may carry an identifier of the terminal device, and a specific implementation manner in which the terminal device monitors the first PDCCH according to a scrambling code in a preset scrambling code set may be that: the terminal device obtains a first scrambling code according to a preset operational relationship and at least one of the random access preamble, the identifier of the terminal device and the time-frequency resource used for sending the PUSCH, and monitors the first PDCCH according to the first scrambling code, wherein the first scrambling code is located in a preset scrambling code set by the preset operational relationship.

In the technical scheme, the terminal equipment can obtain a unique and determined first scrambling code according to at least one of the random access preamble, the identifier of the terminal equipment and the time-frequency resource of the PUSCH and the preset operational relationship, and compared with a mode that whether the first PDCCH scrambled by the scrambling codes in the preset scrambling code set is monitored can be determined only by trying the scrambling codes in the preset scrambling code set one by one, the efficiency of monitoring the first PDCCH by the terminal equipment can be effectively improved by adopting the technical scheme, so that the random access efficiency is favorably improved.

In one implementation, the terminal device obtains the first scrambling code specifically according to the identifier of the terminal device, the number of scrambling codes in the preset scrambling code set, and a preset operational relationship.

In one implementation, when the scrambling codes in the preset scrambling code set are consecutive scrambling codes, the preset operational relationship may be:

X＝mod(UE_ID，N)+x_min

wherein X is a first scrambling code, UE _ ID is an identifier of the terminal equipment, N is the number of scrambling codes in a preset scrambling code set, and X_minThe minimum scrambling code in the preset scrambling code set.

In one implementation, when the scrambling codes in the preset scrambling code set are discontinuous scrambling codes, the preset operational relationship may be:

index mod (UE _ ID, N) and X_index∈{x₀，…，x_N-1}

Wherein index is a scrambling code in a preset scrambling code setUE _ ID is the identification of the terminal equipment, N is the number of scrambling codes in the preset scrambling code set, x_indexIs a scrambling code with index, { x }₀，…，x_N-1Is a preset set of scrambling codes, x₀Is a scrambling code with index 0, x_N-1Is the scrambling code with index N-1, X is the first scrambling code.

In one implementation, the terminal device specifically obtains the first scrambling code according to the random access preamble, the number of scrambling codes in the preset scrambling code set, and a preset operational relationship.

X＝mod(Preamble index，N)+x_min

wherein, X is the first scrambling code, Preamble index is the index of the random access Preamble code, N is the number of the scrambling codes in the preset scrambling code set, and X_minThe minimum scrambling code in the preset scrambling code set.

index mod (Preamble index, N) and X_index∈{x₀，…，x_N-1}

Wherein, index is index of scrambling codes in the preset scrambling code set, N is number of scrambling codes in the preset scrambling code set, X is the first scrambling code, and X is_indexIs a scrambling code with index, { x }₀，…，x_N-1Is a preset set of scrambling codes, x₀Is a scrambling code with index 0, x_N-1Is the scrambling code with index N-1.

In an implementation manner, the terminal device specifically obtains a first numerical value according to the location information of the time-frequency resource used for sending the PUSCH, and obtains the first scrambling code according to the first numerical value, the number of scrambling codes in the preset scrambling code set, and a preset operational relationship.

In one implementation manner, the operation relationship of the terminal device obtaining the first numerical value according to the location information of the time-frequency resource of the PUSCH is as follows:

PO_value＝1+s_id+a*t-id+a*b*f-id+a*b*c*ul-carrier_id

wherein PO_valueThe value is a first numerical value, s _ id represents a first OFDM symbol of the time domain resource of the PUSCH, and t _ id represents the index of a first time slot of the time domain resource of the PUSCH in a system frame; f _ id represents the index of the frequency domain resource of the PUSCH in the frequency domain; ul _ carrier _ id represents an uplink carrier for transmitting the PUSCH in the random access message during the random access, a may be the number of OFDM symbols included in one slot, b may be the number of slots included in a system frame, and c may be the maximum number of frequency domain resources that may be allocated to the PUSCH (or the random access channel).

In one implementation manner, the terminal device obtains the first scrambling code according to the first value, the number of the scrambling codes in the preset scrambling code set and the preset operational relationship, where the scrambling codes in the preset scrambling code set are continuous scrambling codes, and the preset scrambling code set is { x }_min，…，x_maxIn this case, the preset operation relationship may be:

X＝mod(PO_value，N)+x_min

wherein X is the first scrambling code, PO_valueIs a first value, N is the number of scrambling codes in a predetermined set of scrambling codes, x_minThe minimum scrambling code in the preset scrambling code set.

In one implementation, when the scrambling codes in the preset scrambling code set are discontinuous scrambling codes, and the preset scrambling code set is { x }₀，…，x_N-1In this case, the preset operation relationship may be:

index＝mod(PO_valuen) and X ═ X_index∈{x₀，…，x_N-1}

Wherein index is index of scrambling codes in the preset scrambling code set, PO_valueIs a first value, N is the number of scrambling codes in the preset scrambling code set, X is a first scrambling code, X_indexIs a scrambling code with index, { x }₀，…，x_N-1Is a preset scrambling code set, x0 is a scrambling code with index 0, x_N-1Is the scrambling code with index N-1.

In one implementation, the method may further include: the terminal equipment determines a random access radio network temporary identifier RA-RNTI corresponding to a time-frequency resource for sending the random access lead code; if the RA-RNTI and the first scrambling code are the same, the terminal equipment adjusts the first scrambling code according to a preset offset value to obtain an adjusted first scrambling code; the specific implementation manner of the terminal device monitoring the first PDCCH according to the first scrambling code may be: and the terminal equipment monitors the first PDCCH by using the adjusted first scrambling code.

In the technical scheme, when the RA-RNTI and the first scrambling code are the same, the terminal device adjusts the first scrambling code through the preset offset value, and monitors the first PDCCH by using the adjusted first scrambling code, so that the situation that the terminal device cannot distinguish whether the received response information is the response information for the PUSCH (namely, the first response information) or the response information for the Preamble according to the scrambling sequence when the network device scrambles the first PDCCH (the first PDCCH is used for scheduling the first PDSCH and the first PDSCH is used for carrying the response information for the PUSCH) by using the first scrambling code and scrambles the PDCCH for scheduling the PDSCH carrying the response information for the Preamble according to the RA-RNTI can be avoided.

In one implementation, the first response message may carry a temporary cell radio network temporary identity TC-RNTI, and the method may further include: and the terminal equipment sets the TC-RNTI as a cell radio network temporary identifier C-RNTI.

In one implementation, the first response message may carry a cell radio network temporary identity C-RNTI.

In one implementation, the method may further include: if the terminal equipment monitors a second PDCCH scrambled by using the RA-RNTI, the second PDCCH is used for scheduling a second PDSCH carrying a second response message aiming at the random access preamble, and the second response message carries uplink scheduling information; if the second response message carries a second scrambling code, the terminal equipment monitors a third PDCCH by using the second scrambling code, the third PDCCH is used for scheduling a third PDSCH, and the third PDSCH is used for bearing a response message of uplink transmission scheduled aiming at the uplink scheduling information; and/or if the second response message does not carry any scrambling code, the terminal equipment monitors the third PDCCH by adopting the first scrambling code.

In a second aspect, an embodiment of the present application provides another random access method, where the method includes: the network equipment receives a random access message, wherein the random access message comprises a random access lead code and a Physical Uplink Shared Channel (PUSCH); if the PUSCH is successfully decoded, the network equipment generates a first response message aiming at the PUSCH; the network equipment transmits a first PDCCH for scheduling a first PDSCH, wherein the first PDCCH is scrambled by using a scrambling code in a preset scrambling code set, and the first PDSCH is used for carrying a first response message aiming at the PUSCH.

In the technical scheme, the preset scrambling code set may be predetermined by the network device and the terminal device, the terminal device may monitor the first PDCCH sent by the network device according to the scrambling code in the preset scrambling code set, and the network device sends the first PDCCH scrambled by using the scrambling code in the preset scrambling code set, so that the terminal device may successfully monitor the first PDCCH sent by the network device, thereby facilitating the terminal device to successfully obtain the first PDSCH scheduled by the first PDCCH.

In one implementation, the PUSCH may carry an identifier of the terminal device, and the method may further include: the network equipment obtains a first scrambling code according to a preset operational relationship and at least one of the random access preamble, the identifier of the terminal equipment and the time-frequency resource of the PUSCH, and scrambles the first PDCCH according to the first scrambling code, wherein the preset operational relationship can enable the first scrambling code to be located in a preset scrambling code set.

In the technical scheme, the network device can obtain a unique and determined first scrambling code according to at least one of the random access preamble, the identifier of the terminal device and the time-frequency resource of the PUSCH and a preset operational relationship, wherein the first scrambling code is used for scrambling the first PDCCH, and if the terminal device adopts the same scrambling code calculated in the same way and monitors the first PDCCH sent by the network device, the probability that the first PDCCH sent by the network device is successfully detected by the terminal device can be effectively improved.

In one implementation, the network device specifically obtains the first scrambling code according to the identifier of the terminal device, the number of scrambling codes in the preset scrambling code set, and a preset operational relationship.

X＝mod(UE_ID，N)+x_min

index mod (UE _ ID, N) and X_index∈{x₀，…，x_N-1}

Wherein, index is an index of a scrambling code in a preset scrambling code set, UE _ ID is an identifier of a terminal device, N is the number of scrambling codes in the preset scrambling code set, and x_indexIs a scrambling code with index, { x }₀，…，x_N-1Is a preset set of scrambling codes, x₀Is a scrambling code with index 0, x_N-1Is the scrambling code with index N-1, X is the first scrambling code.

In one implementation, the network device specifically obtains the first scrambling code according to the random access preamble, the number of scrambling codes in the preset scrambling code set, and a preset operational relationship.

X＝mod(Preamble index，N)+x_min

wherein, X is a first scrambling code, Preamble index is a random access Preamble index, N is the number of scrambling codes in a preset scrambling code set, and X is_minThe minimum scrambling code in the preset scrambling code set.

index＝mod(Preamble index, N) and X ═ X_index∈{x₀，…，x_N-1}

In an implementation manner, the network device specifically obtains a first numerical value according to the location information of the time-frequency resource of the PUSCH, and obtains the first scrambling code according to the first numerical value, the number of the scrambling codes in the preset scrambling code set, and a preset operational relationship.

In an implementation manner, the network device obtains an operation relationship of the first numerical value according to the location information of the time-frequency resource of the PUSCH as follows:

PO_value＝1+s_id+a*t_id+a*b*f_id+a*b*c*ul_carrier_id

wherein PO_valueThe value is a first numerical value, s-id represents a first OFDM symbol of the time domain resource of the PUSCH, and t _ id represents the index of a first time slot of the time domain resource of the PUSCH in a system frame; f _ id represents the index of the frequency domain resource of the PUSCH in the frequency domain; ul _ carrier _ id represents an uplink carrier for transmitting the PUSCH in the random access message during the random access, a may be the number of OFDM symbols included in one slot, b may be the number of slots included in a system frame, and c may be the maximum number of frequency domain resources that may be allocated to the PUSCH (or the random access channel).

In one implementation, the network device obtains the first scrambling code according to the first value, the number of the scrambling codes in the preset scrambling code set, and the preset operational relationship, where the scrambling codes in the preset scrambling code set are continuous scrambling codes, and the preset scrambling code set is { x }_min，…，x_maxIn this case, the preset operation relationship may be:

X＝mod(PO_value，N)+x_min

wherein X is the first scrambling code, PO_valueIs a first value, N is a predetermined perturbationNumber of scrambling codes in a code set, x_minThe minimum scrambling code in the preset scrambling code set.

index＝mod(PO_valuen) and X ═ X_index∈{x₀，…，x_N-1}

Wherein index is index of scrambling codes in the preset scrambling code set, PO_valueIs a first value, N is the number of scrambling codes in the preset scrambling code set, X is a first scrambling code, X_indexIs a scrambling code with index, { x }₀，…，x_N-1Is a preset set of scrambling codes, x₀Is a scrambling code with index 0, x_N-1Is the scrambling code with index N-1.

In one implementation, a network device determines a random access radio network temporary identifier RA-RNTI corresponding to a time-frequency resource used for sending a random access preamble; if the RA-RNTI and the first scrambling code are the same, the network equipment adjusts the first scrambling code according to a preset offset value to obtain an adjusted first scrambling code; the specific implementation manner of the network device scrambling the first PDCCH according to the first scrambling code may be: and the network equipment scrambles the first PDCCH according to the adjusted first scrambling code.

In the technical scheme, when the RA-RNTI and the first scrambling code are the same, the network equipment adjusts the first scrambling code through a preset offset value and scrambles the first PDCCH according to the adjusted first scrambling code, so that the terminal equipment can distinguish that the first PDSCH scheduled by the first PDCCH scrambled by the adjusted first scrambling code carries a first response message aiming at the PUSCH according to a scrambling code sequence, and the PDSCH scheduled by the PDCCH scrambled by the RA-RNTI carries a response message aiming at the Preamble.

In one implementation, the first response message may carry a temporary cell radio network temporary identity TC-RNTI, and the method may further include: and the network equipment sets the TC-RNTI as a cell radio network temporary identifier C-RNTI corresponding to the terminal equipment.

In one implementation, the method may further include: if the random access lead code is successfully detected, the network equipment generates a second response message aiming at the random access lead code and sends a second PDCCH for scheduling a second PDSCH carrying the second response message, the second PDCCH is scrambled by using the RA-RNTI, and the second response message carries uplink scheduling information; if the second response message carries a second scrambling code, the network equipment sends a third PDCCH for scheduling a third PDSCH, wherein the third PDCCH uses the second scrambling code for scrambling, and the third PDSCH is used for bearing a response message of uplink transmission scheduled by the uplink scheduling information; and/or if the second response message does not carry any scrambling code, the network device sends a third PDCCH for scheduling the third PDSCH, and the third PDCCH is scrambled by using the first scrambling code.

In a third aspect, an embodiment of the present application provides a communication apparatus, where the apparatus has a function of implementing the random access method described in the first aspect. The functions can be realized by hardware, and the functions can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the above-described functions.

In a fourth aspect, the present application provides another communication apparatus, where the apparatus has a function of implementing the random access method described in the second aspect. The functions can be realized by hardware, and the functions can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the above-described functions.

In a fifth aspect, an embodiment of the present application provides a computer-readable storage medium for storing computer program instructions for a communication apparatus according to the third aspect, which includes a program for executing the above-mentioned first aspect.

In a sixth aspect, the present application provides a computer-readable storage medium for storing computer program instructions for a communication apparatus according to the fourth aspect, which includes a program for executing the above-mentioned second aspect.

In a seventh aspect, an embodiment of the present application provides a terminal device, where the terminal device includes a memory and a processor, where the memory stores program instructions, and the processor calls the program instructions stored in the memory to enable the terminal device to implement the random access method according to the first aspect.

In an eighth aspect, an embodiment of the present application provides a network device, where the network device includes a memory and a processor, where the memory stores program instructions, and the processor calls the program instructions stored in the memory to enable the network device to implement the random access method according to the second aspect.

In a ninth aspect, an embodiment of the present application provides a computer program product, which includes a program, and when the program is executed by a communication apparatus, the communication apparatus is caused to implement the method according to the first aspect.

In a tenth aspect, an embodiment of the present application provides a computer program product, which includes a program, and when the program is executed by a communication apparatus, the communication apparatus is caused to implement the method according to the second aspect.

Drawings

Fig. 1a is a schematic flowchart of a four-step random access disclosed in an embodiment of the present application;

fig. 1b is a schematic flow chart of a two-step random access disclosed in the embodiment of the present application;

fig. 1c is a schematic diagram of an architecture of a communication system disclosed in an embodiment of the present application;

fig. 2 is a flowchart illustrating a random access method disclosed in an embodiment of the present application;

fig. 3 is a flowchart of another random access method disclosed in the embodiment of the present application;

fig. 4 is a schematic structural diagram of another random access method disclosed in the embodiment of the present application;

fig. 5 is a flowchart illustrating another random access method disclosed in an embodiment of the present application;

fig. 6 is a schematic structural diagram of a communication device disclosed in an embodiment of the present application;

fig. 7 is a schematic structural diagram of a terminal device disclosed in an embodiment of the present application;

fig. 8 is a schematic structural diagram of another communication device disclosed in the embodiments of the present application;

fig. 9 is a schematic structural diagram of a network device disclosed in an embodiment of the present application.

Detailed Description

For ease of understanding, the basic concepts to which this application relates are presented.

Scrambling

Scrambling is a processing method of digital signals, and a new signal is obtained by XOR operation of a scrambling code and an original signal. Uplink physical channel scrambling generally has the effect of distinguishing between different terminal devices, and downlink scrambling may distinguish between cells and channels. Where the scrambling code may be used to scramble and descramble the original signal. For example, the scrambling code may scramble Downlink Control Information (DCI), or may also be referred to as scrambling PDCCH. Scrambling the DCI specifically means scrambling a Cyclic Redundancy Check (CRC) field of the DCI. Correspondingly, the terminal device descrambles the received DCI, specifically, the terminal device descrambles the CRC field of the DCI by using the corresponding type of scrambling code to determine the format or the type of the DCI.

Scrambling codes may include, but are not limited to: a cell radio network temporary identifier (C-RNTI), a temporary cell radio network temporary identifier (TC-RNTI), and a random access radio network temporary identifier (RA-RNTI).

Second, C-RNTI

If the terminal device is in a radio resource control (RRC-connected) state, it indicates that the terminal device has been allocated with the C-RNTI, and the terminal device needs to carry the C-RNTI when initiating the random access request to the network device. If the terminal device is in an RRC idle (RRC idle) state or an RRC inactive (RRCinamictive) state, it indicates that the terminal device has not been allocated with the C-RNTI. If the terminal device requests RRC connection, the network device may allocate a temporary C-RNTI, which is recorded as TC-RNTI, to the terminal device in a subsequent response message (e.g., Msg2 of the four-step random access procedure), and may convert the TC-RNTI into the C-RNTI after the terminal device confirms that contention resolution is successful.

Three, TC-RNTI

In the contention resolution mode, the network device may assign a TC-RNTI to the terminal device in a response message (e.g., Msg2 of the four-step random access procedure) for carrying the TC-RNTI in a subsequent data transmission procedure (e.g., Msg3 and Msg4 of the four-step random access procedure) to identify the terminal device. And when the terminal equipment is successfully accessed randomly, the TC-RNTI can be converted into the C-RNTI.

Tetra, RA-RNTI

In the random access process, the generation of the RA-RNTI is related to time-frequency resources used by the terminal equipment for sending the lead code. For example, when terminal device a and terminal device B use the same random access channel time-frequency resource to initiate random access, the corresponding RA-RNTIs are the same. Taking a four-step random access process as an example, when the network device detects a random access time-frequency resource for sending a preamble, the network device can calculate an RA-RNTI, the network device processes the DCI based on one DCI format on the PDCCH, and the RA-RNTI is used for scrambling the DCI in the processing process. The network equipment sends response information aiming at the lead code to the terminal equipment, and the terminal equipment knows the time-frequency resource information of the lead code sent by the terminal equipment, so that RA-RNTI can be calculated, and the terminal equipment can detect whether the received PDCCH has the corresponding RA-RNTI or not; if so, it indicates that the random access request is responded by the network device, the terminal device continues to demodulate the PDSCH indicated by the DCI carried by the PDCCH, and if the demodulated preamble is the same as the preamble sent by the terminal device itself, the terminal device may start a subsequent procedure, such as a collision contention resolution procedure. Exemplarily, one way to calculate RA-RNTI may be RA-RNTI-1 + s _ id +14 t _ id +14 x 80 f _ id +14 x 80 x 8 ul _ carrier _ id, where s _ id represents the first Orthogonal Frequency Division Multiplexing (OFDM) symbol of the used random access channel time domain resource (one slot includes 14 OFDM symbols is specified in the protocol), and t _ id represents the index of the first slot of the random access channel time domain resource in the system frame (the maximum subcarrier spacing of the system frame is specified in the protocol as 120KHz, that is, the system frame includes 80 slots); f _ id represents the index of the frequency domain resource of the random access channel in the frequency domain (the maximum number of the frequency domain resources allocated to the random access channel is specified in the protocol to be 8); ul _ carrier _ id represents an uplink carrier for transmitting a random access message in a random access process, wherein the ul _ carrier _ id may take a value of 0 or 1, 0 represents a Normal Uplink (NUL), and 1 represents a Supplemental Uplink (SUL).

Five, physical channel

The physical channel is used by the physical layer for transmission of specific signals. The physical channels include: (a) a Physical Downlink Shared Channel (PDSCH) for carrying downlink service data and the like; (b) a Physical Downlink Control Channel (PDCCH) for carrying downlink scheduling information, such as channel allocation and Downlink Control Information (DCI), that is, DCI carried by the PDCCH; (c) a Physical Uplink Shared Channel (PUSCH) for carrying uplink control information and/or service data; (d) a Physical Uplink Control Channel (PUCCH) for carrying uplink control information, such as Acknowledgement (ACK)/Negative Acknowledgement (NACK), etc. (e) A Physical Random Access Channel (PRACH), which is used for a terminal device to initiate communication with a network device. And when the terminal equipment is randomly accessed, the lead code is sent, and the network equipment receives the lead code through the PRACH to determine the identity of the access terminal equipment.

Sixth, lead code

Preamble (Preamble), i.e., random access Preamble. In an embodiment, the network device identifies the identity of the terminal device when the network device performs random access, or the network device distinguishes the device initiating the random access, which may also be used for other purposes, and is not limited in this embodiment. In Long Term Evolution (LTE) and Rel-15NR (New Radio) communication systems, there are 64 preambles per cell. Optionally, the terminal device may carry a preamble when sending the random access request to the network device, and when the network device sends the response information to the terminal device, an index of the preamble may be sent to reduce the size of the response information. For convenience of explanation, the following embodiments are described with reference to preamble codes.

In order to better understand a random access method disclosed in the embodiments of the present application, a communication system to which the embodiments of the present application are applicable is first described below.

Referring to fig. 1c, fig. 1c is a schematic structural diagram of a communication system according to an embodiment of the present disclosure. As shown in fig. 1c, the communication system comprises: base station 101 and terminal equipment 102.

Based on the above communication system architecture, when a terminal device (e.g. the terminal device 102 shown in fig. 1 c) establishes a connection with a network device (e.g. the base station 101 shown in fig. 1 c) or acquires uplink synchronization, the terminal device is usually required to initiate a random access procedure to the network device. A terminal device may initiate a random access procedure in the following several scenarios.

Scene 1: a terminal device initiates Radio Resource Control (RRC) connection establishment, and when the terminal device changes from an idle state to a connected state, the terminal device initiates a random access procedure.

Scene 2: and reestablishing the RRC connection of the terminal equipment, wherein when the RRC connection is required to be reestablished by the terminal equipment after the radio connection between the terminal equipment and the network equipment is failed, the terminal equipment can initiate a random access process.

Scene 3: when the terminal equipment switches the cells, the terminal equipment initiates a random access process in a new cell.

Scene 4: when downlink data arrives and the terminal equipment is in a connected state, the network equipment needs to transmit the downlink data to the terminal equipment, and finds that the terminal equipment is in an uplink asynchronous state, the network equipment triggers the terminal equipment to initiate a random access process.

Scene 5: when uplink data arrives and the terminal equipment is in a connected state, the terminal equipment has uplink data to be transmitted to the network equipment, finds that the terminal equipment is in an uplink asynchronous state or has no available uplink resource for transmitting the uplink data, and initiates a random access process.

It can be understood that, in addition to the random access initiated in the foregoing scenario, the terminal device may also initiate the random access in other scenarios, and the embodiment of the present application is not limited.

In fig. 1c, the base station 101 may allocate time-frequency resources to the terminal device 102, and each time-frequency resource unit in the time-frequency resources allocated by the base station 101 can be allocated to only one terminal device, so that the terminal device 102 and other terminal devices (not shown) need to compete for the time-frequency resources.

When the terminal apparatus 102 is in any of the above 5 scenarios, the terminal apparatus 102 may send a random access message to the base station 101, so as to initiate a random access procedure to the base station 101, where the random access message may include a Preamble and a PUSCH. In an embodiment, the Preamble may be used to inform the base station 101 that the terminal device 102 needs to establish a connection with it or to obtain uplink synchronization, or for other purposes; the PUSCH may carry information for contention resolution, e.g., an identification of the terminal device. It should be noted that the Preamble may be sent through a physical random access channel PRACH, and the uplink data may be sent through a physical uplink shared channel PUSCH. It should be further noted that, in the embodiment of the present application, the PUSCH or the uplink data refers to uplink data carried on the PUSCH, and the Preamble or the PRACH refers to a Preamble carried on the PRACH.

After receiving the PUSCH, the base station 101 may demodulate and decode the received PUSCH, and if the base station 101 successfully demodulates the received PUSCH, may generate a response message for the PUSCH and carry the response message to the PDSCH scheduled by the PDCCH.

To ensure that the terminal device 102 obtains the response message, the base station 101 may pre-agree with the terminal device 102 with a scrambling code set, and the base station 101 may scramble the PDCCH for scheduling PDSCH according to a scrambling code in the scrambling code set. Correspondingly, after the terminal device 102 sends the random access message to the base station 101, the terminal device 102 may monitor the PDCCH by using the scrambling code in the scrambling code set, and when the scrambling code used by the terminal device 102 to monitor the PDCCH is the same as the scrambling code used by the monitored PDCCH, the terminal device 102 may demodulate the PDSCH scheduled by the PDCCH, and further obtain a response message carried on the PDSCH. Optionally, the terminal device may further determine whether the random access is successful according to the response message.

The terminal device may be a User Equipment (UE), a remote terminal, a mobile terminal, a wireless communication device, a User Equipment, and the like, where the User device may be a mobile phone, a desktop computer, a notebook computer, or a wearable device.

It should be noted that, in fig. 1c, the base station receives only the random access message sent by one terminal device, which is only used for example and does not form a limitation to the embodiment of the present application, and in other feasible implementation manners, the base station may also receive the random access message sent by another terminal device.

It is to be understood that the communication system described in the embodiment of the present application is for more clearly illustrating the technical solution of the embodiment of the present application, and does not constitute a limitation to the technical solution provided in the embodiment of the present application, and as a person having ordinary skill in the art knows that along with the evolution of the system architecture and the appearance of a new service scenario, the technical solution provided in the embodiment of the present application is also applicable to similar technical problems.

The random access method and the apparatus thereof provided by the present application are described in detail below with reference to the accompanying drawings.

Referring to fig. 2, fig. 2 is a flowchart illustrating a random access method according to an embodiment of the present application, where the method may include, but is not limited to, the following steps:

step S201: and the terminal equipment sends a random access message to the network equipment, wherein the random access message comprises a Preamble and a PUSCH.

Specifically, for example, when the terminal device needs to establish a connection with the network device or acquire uplink synchronization, a random access message may be sent to the network device, where the random access message may be used for contention access, and the random access message may include a Preamble and a PUSCH. In one implementation manner, the network device configures, in advance, time-frequency resources for sending the random access message for the terminal device, where the time-frequency resources include PRACH time-frequency resources for sending a Preamble in the random access message and PUSCH time-frequency resources for sending the random access message. The terminal equipment can send the Preamble in the random access message to the network equipment through the PRACH time-frequency resource configured for the terminal equipment in advance by the network equipment, and send the uplink data (PUSCH) in the random access message to the network equipment through the PUSCH time-frequency resource configured for the terminal equipment in advance by the network equipment.

Step S202: and if the network equipment successfully decodes the PUSCH, generating a first response message aiming at the PUSCH.

In this embodiment, the network device may manage (configure) time-frequency resources for sending the random access message, and the time-frequency resources that the network device may manage may include PRACH time-frequency resources and PUSCH time-frequency resources. In one implementation, the network device may notify each terminal device of which time-frequency resources the PRACH is allowed to be transmitted on by broadcasting system information. In one implementation, the network device may further notify each terminal device by broadcasting system information on which time-frequency resources the PUSCH is allowed to be transmitted. For example, when the network device is configured to manage the time-frequency resources used by terminal device 1 and terminal device 2, the network device may notify time-frequency resource 1 configured for terminal device 1 to transmit PUSCH and notify terminal device 2 to configure for terminal device 2 on time-frequency resource 2 configured for transmitting PUSCH. The time frequency resource 1 and the time frequency resource 2 may be the same or different.

Specifically, after the network device notifies each terminal device of which time-frequency resources the PRACH and the PUSCH can be transmitted, the network device may receive the PRACH (Preamble) and the PUSCH (uplink data) of the random access message on the configured PRACH time-frequency resources and PUSCH time-frequency resources, respectively. For the PRACH time-frequency resource, the terminal device may send a Preamble on the PRACH time-frequency resource, and the network device may receive the Preamble on the PRACH time-frequency resource. Similarly, for the PUSCH time-frequency resource, the terminal device may send uplink data on the PUSCH time-frequency resource, and the network device may receive the uplink data on the PUSCH time-frequency resource.

If the network device successfully detects the preamble and successfully decodes the received PUSCH, the network device generates a first response message for the PUSCH, carries the first response message on the first PDSCH, and then sends the first PDSCH to the terminal device. In one implementation, the first PDSCH may also carry response information for a Preamble. In another implementation, the first PDSCH may not carry response information for a Preamble, but rather, the response information for the Preamble is carried in another PDSCH.

In an implementation manner, if the network device only successfully detects the Preamble and fails to decode the PUSCH, the network device may generate a second response message for the Preamble, and bear the second response message on the second PDSCH, and then send the second PDSCH to the terminal device.

In one implementation, the second response message may refer to a Random Access Response (RAR) in a four-step random access procedure, or the second response message may include other information besides information in the RAR. The RAR may include one or more of a preamble index, a Timing advance command (TA command), Uplink scheduling information (Uplink grant, UL grant), and a temporary cell radio network temporary identifier TC-RNTI. Wherein, the preamble index is the index of the preamble in the random access message; the TA command is used for the terminal equipment to determine the time size of the timing advance; the UL grant may be configured to configure a portion of time-frequency resources for the terminal device to use, and the terminal device may send uplink data to the network device using the portion of time-frequency resources.

The network device may be an entity for transmitting or receiving signals, for example, the network device may be an access network device (e.g., a base station in fig. 1 c).

Step S203: the network equipment sends a first PDCCH for scheduling a first PDSCH, and the first PDSCH is used for carrying a first response message.

And the first PDCCH is scrambled by using a scrambling code in a preset scrambling code set. In an implementation manner, a specific implementation manner in which the network device scrambles the first PDCCH by using a scrambling code in the preset scrambling code set may be: and the network equipment randomly selects a scrambling code in a preset scrambling code set to scramble the first PDCCH. Or, the network device selects a largest (or smallest) scrambling code from a preset scrambling code set according to the value of the scrambling code, and performs scrambling index on the first PDCCH.

Step S204: and the terminal equipment monitors the first PDCCH according to the scrambling codes in the preset scrambling code set.

Specifically, after the terminal device sends the random access message to the network device, the terminal device may monitor the first PDCCH according to the scrambling codes in the preset scrambling code set, so that the terminal device receives the first PDSCH from the network device according to the monitored first PDCCH when the first PDCCH is monitored.

In one implementation, the scrambling codes in the preset scrambling code set may be continuous scrambling codes or discontinuous scrambling codes. When the scrambling codes in the preset scrambling code set are continuous scrambling codes, the preset scrambling code set can be a continuous value in a value range of a Radio Network Temporary Identifier (RNTI), the range and the length of the continuous value are not limited, and the starting position and the ending position are not limited. For example, if the value range of the RNTI sequence is 0001 to FFEF, the value range of the preset scrambling code set may be any one segment of continuous values in the range of 0001 to FFEF, for example, the value range of the preset scrambling code set may be FF00-FFEF or 0001-FEFF. When the scrambling codes in the preset scrambling code set are discontinuous scrambling codes, the preset scrambling code set can be a discontinuous value taking set in the value range of the RNTI sequence, the length of the value taking set is not limited, and the starting position and the ending position are not limited. For example, if the range of the RNTI sequence is 0001 to FFEF, the preset scrambling code set may be one or more values of 0001 to FFEF, for example, the preset scrambling code set may be {0001, 0003, 0005}, {0001, 000F } or {0001, 00EF, 0EEF, F000}, etc.

In one implementation, the first PDCCH carries Downlink Control Information (DCI), and the DCI may indicate time-frequency resources for transmitting the first PDSCH. If the network device scrambles the first PDCCH by using the scrambling code 1 in the preset scrambling code set, the terminal device can only descramble the first PDCCH correctly by using the scrambling code 1. The preset scrambling code set may be a scrambling code set pre-agreed by the terminal device and the network device, any one scrambling code in the preset scrambling code set may be used to scramble the first PDCCH, and if the terminal device detects the first PDCCH scrambled by any one scrambling code in the preset scrambling code set, it indicates that the monitored data transmitted on the time-frequency resource indicated by the DCI carried on the first PDCCH includes response information for the PUSCH in the random access message (in the embodiment of the present application, the data transmitted on the time-frequency resource indicated by the DCI is the first response message), and at this time, the terminal device may demodulate the first PDSCH indicated by the DCI. In one implementation, the network device may notify all terminal devices of the preset scrambling code set through broadcasting system information.

In an implementation manner, a specific implementation manner in which the terminal device monitors the first PDCCH according to the scrambling code in the preset scrambling code set may be: the terminal device attempts to detect DCI format 1_0 whose CRC is scrambled with a scrambling code (e.g., TC-RNTI) in a preset set of scrambling codes, which is used to schedule one PDSCH (e.g., the first PDSCH). In an embodiment, the PDSCH carries (or carries) a CRID. That is, the terminal device selects a scrambling code from the preset scrambling code set to attempt whether the first PDSCH can be descrambled correctly; if the first PDSCH cannot be descrambled correctly, whether other scrambling codes in the preset scrambling code set can be descrambled correctly is tried again until a scrambling code is found in the preset scrambling code set and the first PDCCH can be descrambled correctly, or until all the scrambling codes in the preset scrambling code set are determined to be incapable of descrambling the first PDCCH correctly. If all the scrambling codes in the preset scrambling code set cannot descramble the first PDCCH correctly, it indicates that the data carried on the first PDSCH scheduled by the first PDCCH is not the data sent to the terminal device.

In an implementation manner, in the process of monitoring the first PDCCH by the terminal device according to the scrambling codes in the preset scrambling code set, one or more scrambling codes need to be tried to possibly monitor the first PDCCH, so that the efficiency of monitoring the first PDCCH by the terminal device is low, and thus the process of random access is too long and the efficiency of random access is low. For the problem, the number of the scrambling codes included in the preset scrambling code set can be reduced, so that the efficiency of monitoring the first PDCCH by the terminal device is improved.

In one implementation, the scrambling code in the preset scrambling code set may be a TC-RNTI or an RA-RNTI. It should be noted that, in the embodiment of the present application, the name of the scrambling code in the preset scrambling code set is not limited, as long as the scrambling code is a scrambling sequence of DCI (or a scrambling sequence of CRC of DCI) carried on a PDCCH sent to the terminal device by the network device, and the DCI is used to schedule the sending of the PDSCH, and the PDSCH is used to carry a response message to the random access message sent to the terminal device, where the response message at least carries the CRID, and both the scrambling codes in the preset scrambling code set in the embodiment of the present application are scrambling codes in the preset scrambling code set in the embodiment of the present application.

Step S205: and the terminal equipment receives the first PDSCH from the network equipment according to the monitored first PDCCH.

Specifically, if the terminal device monitors a first PDCCH scrambled by a scrambling code in a preset scrambling code set, it indicates that the network device responds to a random access message sent by the terminal device, and the terminal device may receive a first PDSCH from the network device according to the monitored first PDCCH, and demodulate the first PDSCH, thereby obtaining a first response message carried on the first PDSCH. It should be noted that, at least some of the steps may not be in a sequential order, for example, step S204 may occur before step S202, and the present application is not limited thereto.

In one implementation, the first response Message may include contention resolution information (CRM), and the terminal device may determine whether the contention access is successful according to the contention resolution information. In one implementation, the CRM may include a CRID, and the specific implementation of the terminal device determining whether the contention access is successful according to the CRM may be: obtaining a CRID in the CRM, and if the CRID is matched with data (which is an identifier of the terminal device) in an Uplink Common Control channel service data unit (UL CCCHDU) carried by a PUSCH in a random access message of the terminal device, determining that the terminal device is successful in competition access; and if the CRID is not matched with the data in the UL CCCH SDU carried in the random access message by the terminal equipment, determining that the terminal equipment fails to compete for access.

In an implementation manner, the PUSCH carries an identifier of the terminal device, and the CRID may be obtained according to the identifier of the terminal device. Specifically, if the total bit number of the CRID is the same as the total bit number of the identifier of the terminal device, the CRID is the same as the identifier of the terminal device; if the total number of bits of a CRID is different from the total number of bits of the identity of the terminal device, for example, the total number of bits of a CRID is s1 bits, the total number of bits of the identity of the terminal device is s2 bits, and s2 > s1, then the CRID is the first s1 bits of the identity of the terminal device. For example, if the total number of bits for a CRID specified in the protocol is 48 bits, if the length of the identity of the terminal device is greater than 48 bits, then the CRID is the first 48 bits of the identity of the terminal device.

In an implementation manner, if the total bit number of the CRID is the same as the total bit number of the identifier of the terminal device, whether the CRID is matched with the identifier of the terminal device carried by the PUSCH in the random access message by the terminal device means: whether the CRID is the same as the identifier of the terminal equipment carried by the PUSCH in the random access message or not (if the CRID is the same as the identifier of the terminal equipment carried by the PUSCH in the random access message, the terminal equipment can determine that the contention access is successful); if the total bit number of the CRID is different from the total bit number of the identifier of the terminal device, the total bit number of the CRID is s1 bits, and the total bit number of the identifier of the terminal device is s2 bits, then whether the CRID is matched with the identifier of the terminal device carried by the PUSCH in the random access message means: whether the first s1 bit of the identifier of the terminal device carried by the terminal device in the random access message in the PUSCH is the same as the CRID or not.

In an implementation manner, the first response message carries a Temporary Cell radio network Temporary Identifier TC-RNTI, and after the terminal device determines that contention access is successful, the TC-RNTI may be set as a Cell radio network Temporary Identifier (C-RNTI). The C-RNTI may be used for scrambling the PDCCH that schedules the PDSCH carrying contention resolution information with the C-RNTI when the network device sends the contention resolution information to the terminal device if the terminal device initiates a random access request again before connection release after the connection is established between the terminal device and the network device, and similarly, the terminal device may also monitor the PDCCH only using the C-RNTI. By the method, the situation that the network equipment needs to select one scrambling code in the preset scrambling code set to scramble the PDCCH before sending the PDCCH every time can be avoided, and similarly, the operation that the terminal equipment selects one scrambling code in the preset scrambling code set to descramble the PDCCH can also be avoided.

In one implementation, the first response message carries a cell radio network temporary identifier C-RNTI, and the terminal device may store the C-RNTI after the terminal device determines that contention access is successful.

In one implementation manner, the terminal device may further determine whether the RNTI carried in the first response message is the C-RNTI or the TC-RNTI. According to the result of the determination, corresponding processing is performed, for example, see the description of the foregoing embodiments.

In one implementation manner, the TC-RNTI (or C-RNTI) carried by the first response message may be the same as or different from the scrambling code for scrambling the first PDCCH. The TC-RNTI (or C-RNTI) carried by the first response message may be located in the preset scrambling code set, or may not be located in the preset scrambling code set, which is not limited in this embodiment of the application.

In one implementation, the first response message may include the contention resolution identity, or the first response message may include the contention resolution identity and the first information. The first information may include at least one of: feeding back resource information of the acknowledgement message, a timing advance command, an uplink data transmission authorization, a lead code carried by a random access message sent by the terminal equipment, one of a cell radio network temporary identifier C-RNTI or a temporary cell radio network temporary identifier TC-RNTI, RRC reconfiguration (RRC reconfiguration) information, RRC Reestablishment (RRC) information and RRC recovery (RRC resume) information. The first information may also include other RRC information, which is not illustrated here. The C-RNT or TC-RNTI is used for being allocated to the terminal equipment and used as a dynamic identifier of the terminal equipment in the subsequent uplink and downlink data transmission process.

It can be seen that, by agreeing a scrambling code set (i.e. a preset scrambling code set) with the terminal device, the network device can scramble the first PDCCH by using a scrambling code in the preset scrambling code set, and in a similar way, the terminal device can try to scramble each scrambling code in the scrambling code set one by one until the first PDCCH scrambled by using the scrambling code in the scrambling code set is monitored, and can receive the first PDSCH from the network device according to the monitored first PDCCH. Therefore, by implementing the embodiment of the application, the terminal device is facilitated to successfully obtain the first PDSCH scheduled by the first PDCCH.

It is understood that the preset scrambling code set described above may also be determined by the network device and signaled to the terminal device. Referring to fig. 3, fig. 3 is a flowchart of another random access method provided in this embodiment, where the method describes in detail how to obtain a first scrambling code according to a preset operation relationship and at least one of a Preamble, an identifier of a terminal device, and a time-frequency resource of a PUSCH, and the method may include, but is not limited to, the following steps:

step S301: the terminal equipment sends a random access message to the network equipment, wherein the random access message comprises a Preamble and a PUSCH, and the PUSCH carries an identifier of the terminal equipment.

Step S302: and if the network equipment successfully decodes the PUSCH, generating a first response message aiming at the PUSCH.

It should be noted that, the execution processes of step S301 to step S302 can respectively refer to the detailed descriptions of step S201 to step S202 in fig. 2, and are not described herein again. In an implementation manner, the PUSCH may carry an identifier of the terminal device, or an UL CCCH SDU, and the UL CCCH SDU carries the identifier of the terminal device.

Step S303: the terminal device obtains a first scrambling code according to a preset operational relationship and at least one of a Preamble, an identifier of the terminal device and a time-frequency resource of a PUSCH, wherein the first PDCCH is used for scheduling a first PDSCH carrying a first response message for the PUSCH, and the preset operational relationship enables the first scrambling code to be located in a preset scrambling code set.

Specifically, after the terminal device sends the random access message to the network device, it needs to monitor the first PDCCH according to the scrambling codes in the preset scrambling code set, so as to receive the first PDSCH from the network device according to the monitored first PDCCH. In this embodiment of the present application, a specific implementation manner of the terminal device monitoring the first PDCCH according to the scrambling code in the preset scrambling code set may be: the terminal equipment obtains a first scrambling code according to a preset operation relation and at least one of a Preamble, an identifier of the terminal equipment and a time-frequency resource (PUSCH interference, PO) of the PUSCH, and monitors the first PDCCH according to the first scrambling code. And the time-frequency resource of the PUSCH is the time-frequency resource which is determined by the terminal equipment and is used for sending the PUSCH in the random access message.

In one implementation, the terminal device may specifically obtain the first scrambling code according to the identifier of the terminal device, the number of scrambling codes in the preset scrambling code set, and a preset operational relationship; or, the terminal device may specifically obtain the first scrambling code according to the Preamble, the number of scrambling codes in the preset scrambling code set, and the preset operational relationship; or, the terminal device may specifically obtain the first value according to the PO location information, and obtain the first scrambling code according to the first value, the number of the scrambling codes in the preset scrambling code set, and the preset operational relationship.

In an implementation manner, the scrambling codes in the preset scrambling code set may be continuous scrambling codes or discontinuous scrambling codes. When the scrambling codes in the preset scrambling code set are continuous scrambling codes, and the preset scrambling code set is { x_min，…，x_maxIn this case, the preset operation relationship may be:

X＝mod(UE_ID，N)+x_min(1)

in the preset operation relation (1), X is the first scrambling code, UE _ ID is the identifier of the terminal equipment, and N is the preset operation relationNumber of scrambling codes in the set of scrambling codes, x_minMod () represents a modulo operation for the smallest scrambling code in the preset set of scrambling codes. According to the preset operation relation (1), the number N of the scrambling codes in the preset scrambling code set is used as a divisor, so that the mod (UE _ ID, N) result is smaller than N, and then the minimum value x in the preset scrambling code set is added_minThe obtained first scrambling code (i.e., X) may be located in a preset set of scrambling codes. Wherein, N ═ x_max-x_min+1。

index mod (UE _ ID, N) and X_index∈{x₀，…，x_N-1} (2)

In the preset operation relation (2), index is an index of a scrambling code in the preset scrambling code set, UE _ ID is an identifier of the terminal equipment, N is the number of scrambling codes in the preset scrambling code set, and x_indexIs a scrambling code with index, { x }₀，…，x_N-1Is a preset set of scrambling codes, x₀Is a scrambling code with index 0, x_N-1Is the scrambling code with index N-1, X is the first scrambling code. As can be seen from the preset operation relationship (2), since the result of mod (UE _ ID, N) (i.e., the index of the first scrambling code) is smaller than N, the first scrambling code (i.e., X) obtained according to the operation relationship (2) is located in the preset scrambling code set.

In one implementation manner, when the terminal device obtains the first scrambling code according to the Preamble, the number of the scrambling codes in the preset scrambling code set and the preset operational relationship, and the scrambling codes in the preset scrambling code set are continuous scrambling codes, the preset scrambling code set is { x }_min，…，x_maxIn this case, the preset operation relationship may be:

X＝mod(Preamble index，N)+x_min(3)

in the preset operation relation (3), X is the first scrambling code, N is the number of the scrambling codes in the preset scrambling code set, and X_minIs the minimum scrambling code in the preset scrambling code set, Preamble iAnd ndex is the index of preamble in the random access message in step S301. As can be known from the preset operation relationship (3), the result of mod (Preamble index, N) is smaller than N, so the first scrambling code (i.e., X) obtained according to the operation relationship (3) is located in the preset scrambling code set.

index mod (Preamble index, N) and X_index∈{x₀，…，x_N-1} (4)

In the preset operation relationship (4), index is an index of a scrambling code in the preset scrambling code set, preamble is an index of a preamble in the random access message in step S301, N is the number of scrambling codes in the preset scrambling code set, x_indexIs a scrambling code with index, { x }₀，…，x_N-1Is a preset set of scrambling codes, x₀Is a scrambling code with index 0, x_N-1Is the scrambling code with index N-1, X is the first scrambling code. As can be known from the preset operation relationship (4), the result of mod (Preamble index, N) (i.e., the index of the first scrambling code) is smaller than N, so that the first scrambling code (i.e., X) obtained according to the operation relationship (4) is located in the preset scrambling code set.

In an implementation manner, the terminal device may obtain the first value according to the position information of the PO, and obtain the first scrambling code according to the first value, the number of the scrambling codes in the preset scrambling code set, and the preset operational relationship. In one implementation, the location information of the PO may include, but is not limited to: transmitting a first Orthogonal Frequency Division Multiplexing (OFDM) symbol of a time domain resource of a PUSCH in a random access message in a random access process, transmitting an index of a first slot of the time domain resource of the PUSCH in a system frame, transmitting an uplink carrier of the PUSCH in the random access message in a frequency domain index of the frequency domain resource of the PUSCH and the random access process, and obtaining an operational relationship of a first numerical value according to position information of a PO by a terminal device as follows:

PO_value＝1+s_id+a*t_id+a*b*f_id+a*b*c*ul_carrier_id (5)

in the operational relationship (5), PO_valueFor the first value, the definition of s _ id, t _ id index, f _ id index and ul _ carrier _ id can be referred to the description above (for calculating RA-RNTI), and will not be described herein. a may be the number of OFDM symbols included in one slot, b may be the number of slots included in a system frame, and c may be the maximum number of frequency domain resources that may be allocated to a PUSCH (or random access channel). The values of a, b and c in the operation relation (5) may change with the granularity of the PUSCH configured by the network device to the terminal device. For example, when the protocol specifies that a slot contains 14 OFDM symbols, a-14; when the maximum subcarrier interval of a system frame is 120KHz, namely 1ms contains 80 time slots, b is 80; when the protocol specifies that the number of frequency domain resources that can be allocated to the PUSCH (or random access channel) is 8 at maximum, c is 8. The values of a, b and c are only used as examples and do not limit the embodiments of the present application.

Specifically, after the terminal device obtains the first value, the first scrambling code may be obtained according to the first value, the number of the scrambling codes in the preset scrambling code set, and the preset operational relationship, where the scrambling codes in the preset scrambling code set are continuous scrambling codes, and the preset scrambling code set is { x }_min，…，x_maxIn this case, the preset operation relationship may be:

X＝mod(PO_value，N)+x_min(6)

in the predetermined operation relation (6), X is the first scrambling code, PO_valueIs a first value, N is the number of scrambling codes in a predetermined set of scrambling codes, x_minThe minimum scrambling code in the preset scrambling code set. Mod (PO) can be known from the predetermined operation relationship (6)_valueN) is smaller than N, so the first scrambling code (i.e. X) obtained according to the operational relationship (6) is located in the preset scrambling code set.

index＝mod(PO_valuen) and X ═ X_index∈{x₀，…，x_N-1} (7)

In the preset operation relation (7), index is the index of the scrambling codes in the preset scrambling code set, PO_valueIs a first value, N is the number of scrambling codes in a predetermined set of scrambling codes, x_indexIs a scrambling code with index, { x }₀，…，x_N-1Is a preset set of scrambling codes, x₀Is a scrambling code with index 0, x_N-1Is the scrambling code with index N-1, X is the first scrambling code. As can be seen from the operational relationship (7), the result of mod (the first value, N) (i.e. the index of the first scrambling code) is smaller than N, so that the first scrambling code (i.e. X) obtained according to the operational relationship (7) is located in the preset scrambling code set.

In an implementation manner, the first response message may carry one TC-RNTI, and after the terminal device obtains the first response message, the TC-RNTI may be set as the C-RNT. In an implementation manner, the first response message may carry a C-RNTI, and the terminal device may store the C-RNTI after acquiring the first response message. In an implementation manner, the TC-RNTI (or C-RNTI) carried by the first response message may be the same as or different from the scrambling code for scrambling the first PDCCH, and the TC-RNTI (or C-RNTI) carried by the first response message may be located in the preset scrambling code set or may not be located in the preset scrambling code set.

For example, when the network device and the terminal device 1, and the terminal device 2 agree to obtain the first scrambling code according to the Preamble, the number of scrambling codes in the preset scrambling code set, and the preset operational relationship, since the preambles sent to the same network device by the terminal device 1 and the terminal device 2 may be the same, and the scrambling code sets agreed in advance by the network device and the terminal device 1 and the terminal device 2 may also be the same, the first scrambling codes calculated by the terminal device 1 and the terminal device 2 may be the same, and correspondingly, the network device may scramble the first PDCCH sent to the terminal device 1 and the terminal device 2 with the same first scrambling code, and the terminal device 1 and the terminal device 2 may decode the first PDSCH indicated by the first PDCCH at the same time. And confirming whether the first PDSCH is self according to the competition resolving ID in the first response information carried in the first PDSCH. There may be two cases for the first PDSCH:

1. the first PDSCH is unicast data and only includes response information of terminal device 1, and the response information at least includes a contention resolution ID.

a. After terminal device 2 demodulates the first PDSCH, it finds that the contention resolution ID is not matched with the data (or the identifier of terminal device 2) in the UL CCCHSDU transmitted by terminal device 2, and terminal device 2 discards the first PDSCH. In an embodiment, the terminal device 2 may reinitiate the random access, when the network device sends the PDSCH carrying the response information including the contention resolution ID to the terminal device 2, continue to scramble the PDCCH scheduling the PDSCH with the first scrambling code, and the terminal device 2 monitors the PDCCH with the first scrambling code.

b. After demodulating the first PDSCH, the terminal device 1 finds that the contention resolution ID matches with data in the ul ccchsdu (or the identifier of the terminal device 1) transmitted by the terminal device 1, and the terminal device 1 confirms that the contention resolution is successful and sets the TC-RNTI carried in the first PDSCH as the C-RNTI. When receiving contention resolution information sent by the network device in a subsequent newly initiated random access process, the terminal device 1 may monitor the PDCCH using the C-RNTI, so as to avoid collision with the terminal device 2 when monitoring the PDCCH. Note that, at this time, the TC-RNTI carried in the first PDSCH is different from the first scrambling code.

2. The first PDSCH is multicast data including response information of the terminal device 1 and response information of the terminal device 2, and both the response information of the terminal device 1 and the response information of the terminal device 2 include at least a contention resolution ID

a. After demodulating the first PDSCH, the terminal device 2 finds that one of the contention resolution IDs matches data in the ul ccch SDU (or the identifier of the terminal device 2) transmitted by the terminal device 2, the terminal device 2 determines that contention resolution is successful, and the terminal device 2 stores TC-RNTI carried by the data portion where the contention resolution ID is located and sets the TC-RNTI as the C-RNTI. When the terminal device 2 receives contention resolution information sent by the network device in a subsequent newly initiated random access process, the C-RNTI may be used to monitor the PDCCH. Avoiding collision with terminal device 1 while monitoring PDCCH

b. After demodulating the first PDSCH, the terminal device 1 finds that one of the contention resolution IDs matches data in the ul ccch SDU (or the identifier of the terminal device 1) transmitted by the terminal device 1, the terminal device 1 determines that contention resolution is successful, and the terminal device 1 stores TC-RNTI carried by the data portion where the contention resolution ID is located and sets the TC-RNTI as the C-RNTI. When receiving contention resolution information sent by the network device in a subsequent newly initiated random access process, the terminal device 1 may monitor the PDCCH using the C-RNTI. Avoiding collision with terminal device 2 while monitoring the PDCCH. Note that the TC-RNTI carried by the data portion in which the contention resolution ID in the response information of the terminal apparatus 1 is located is different from the TC-RNTI carried by the data portion in which the contention resolution ID in the response information of the terminal apparatus 2 is located.

It should be noted that, in step S303, it is only stated that the terminal device obtains the first scrambling code according to any one of the Preamble, the identifier of the terminal device, and the time-frequency resource of the PUSCH and the preset operational relationship, and in other feasible implementation manners, the terminal device may also obtain the first scrambling code according to a plurality of the Preamble, the identifier of the terminal device, and the time-frequency resource of the PUSCH and the preset operational relationship.

Referring to the embodiment shown in fig. 2: because the terminal device does not know which scrambling code in the preset scrambling code set is used by the network device to scramble the first PDCCH, the terminal device needs to try (i.e., perform blind detection) the scrambling codes in the preset scrambling code set one by one to determine whether to monitor the first PDCCH scrambled by the scrambling code in the preset scrambling code set, that is, the terminal device may need to try many times to determine which scrambling code in the preset scrambling code set is used by the first PDCCH. Compared with the blind detection mode adopted in the embodiment of fig. 2, the terminal device and the network device in the embodiment of fig. 3 have the same mode of acquiring the first scrambling code, and both obtain the unique first scrambling code according to the preset operational relationship and at least one of the Preamble, the identifier of the terminal device, and the time-frequency resource of the PUSCH, that is, the first scrambling code calculated by the terminal device and the first scrambling code calculated by the network device are the same, so that the efficiency of monitoring the first PDCCH by the terminal device can be effectively improved, and the random access efficiency is favorably improved.

Step S304: and the terminal equipment monitors the first PDCCH according to the first scrambling code.

Specifically, after determining the first scrambling code, the terminal device may monitor the first PDCCH with the first scrambling code.

Step S305: and the network equipment obtains the first scrambling code according to at least one of the Preamble, the identifier of the terminal equipment and the time-frequency resource of the PUSCH and a preset operation relation.

It should be noted that the manner in which the network device obtains the first scrambling code according to the preset operation relationship and at least one of the Preamble, the identifier of the terminal device, and the time-frequency resource of the PUSCH is the same as the manner in which the terminal device obtains the first scrambling code, and the execution process of step S305 may refer to the specific description of step S303, which is not described herein again.

It should be further noted that, as can be seen from the embodiment shown in fig. 2 and step S303, there are various ways to obtain the first scrambling code, for example, the first scrambling code may be specifically obtained according to the identifier of the terminal device, the number of scrambling codes in the preset scrambling code set, and the preset operational relationship (1) (or the preset operational relationship (2)); obtaining a first scrambling code according to the Preamble, the number of the scrambling codes in the preset scrambling code set and a preset operation relation (3) (or a preset operation relation (4)); obtaining a first scrambling code according to the time-frequency resource of the PUSCH, the number of scrambling codes in a preset scrambling code set, an operation relation (5) and a preset operation relation (6) (or a preset operation relation (7)); and randomly determining a first scrambling code in a preset scrambling code set. Therefore, the terminal device and the network device need to agree to determine the first scrambling code in the same manner, which is beneficial to improving the random access efficiency. In one implementation, the network device may notify the terminal device of the broadcast system information, which way the network device will acquire the first scrambling code, and after receiving the broadcast system information, the terminal device may acquire the first scrambling code in the same way as the network device does. In other possible implementation manners, the network device and the terminal device may also use other manners (such as a protocol agreement) besides broadcasting system information to agree on which manner to use to determine the first scrambling code, which is not limited in this embodiment of the present application.

Step S306: and the network equipment scrambles the first PDCCH according to the first scrambling code.

Specifically, after obtaining the first scrambling code, the network device may scramble the first PDCCH according to the first scrambling code, that is, scramble the CRC of the DCI carried on the first PDCCH according to the first scrambling code.

Step S307: the network device transmits a first PDCCH for scheduling a first PDSCH.

Step S308: and the terminal equipment receives the first PDSCH from the network equipment according to the monitored first PDCCH.

It should be noted that the execution processes of step S307 to step S308 can be referred to the specific descriptions of step S204 to step S205 in fig. 2, which are not repeated herein. At least some of the above steps may not be in a sequential order, for example, steps S303 and S304 may occur before step S302, and the present application is not limited thereto.

By implementing the embodiment of the application, both the terminal device and the network device can obtain the first scrambling code according to at least one of the Preamble, the identifier of the terminal device and the time-frequency resource of the PUSCH and the preset operational relationship, that is, when the terminal device and the network device adopt the same mode to obtain the first scrambling code, the first scrambling code calculated by the terminal device and the first scrambling code calculated by the network device are the same, so that the efficiency of monitoring the first PDCCH by the terminal device can be effectively improved, and the random access efficiency is favorably improved.

Referring to fig. 4, fig. 4 is a flowchart illustrating another random access method provided in this embodiment of the present application, where the method details how to adjust a first scrambling code when an RA-RNTI corresponding to a time-frequency resource used for sending a Preamble is the same as the first scrambling code, so that the adjusted first scrambling code is different from the RA-RNTI, and the method may include, but is not limited to the following steps:

step S401: the terminal equipment sends a random access message to the network equipment, wherein the random access message comprises a Preamble and a PUSCH, and the PUSCH carries an identifier of the terminal equipment.

Step S402: and if the network equipment successfully decodes the PUSCH, generating a first response message aiming at the PUSCH.

Step S403: the terminal device obtains a first scrambling code according to a preset operational relationship and at least one of a random access preamble, an identifier of the terminal device and a time-frequency resource of a PUSCH, wherein the first PDCCH is used for scheduling a first PDSCH carrying a first response message for the PUSCH, and the first scrambling code is located in a preset scrambling code set through the preset operational relationship.

It should be noted that the execution processes of step S401 to step S403 can respectively refer to the detailed descriptions of step S301 to step S303 in fig. 3, which are not repeated herein.

Step S404: and the terminal equipment determines the RA-RNTI corresponding to the time-frequency resource for sending the Preamble.

In this embodiment of the present application, the random access message sent by the terminal device to the network device may include a Preamble and a PUSCH, and if the network device successfully detects the Preamble and decodes the PUSCH successfully, a first response message for the PUSCH may be generated. If the network device successfully detects the Preamble but fails to decode the PUSCH, a second response message for the Preamble may be generated.

When the terminal device receives the first response message, it indicates that the network device successfully detects the Preamble and successfully decodes the PUSCH, at this time, the terminal device needs to obtain the CRID carried by the PUSCH, and determines whether the CRID is matched with the identifier of the terminal device, thereby determining whether the terminal device is successful in contention access. When the terminal device receives the second response message, it indicates that the network device only successfully detects the Preamble, and fails to demodulate the PUSCH, at this time, the terminal device needs to retransmit the Preamble and the PUSCH (or retransmit the PUSCH only) to the network device. The network device detects and decodes the received retransmission information, if the PUSCH decoding is successful, the network device sends a third response message at least containing the CRID to the terminal device, and when the terminal device receives the third response message and determines that the CRID matches the identifier of the terminal device through the third response message, it indicates that the PUSCH is successfully detected by the network device and the terminal device is successfully contended for access, at this time, the terminal device may send an acknowledgement message to the network device, where the acknowledgement message is used to notify the network device that the terminal device has successfully received the third response message. It can be seen that the terminal device needs to perform different operations after receiving different response messages.

As can be seen from the above, after receiving the response message, the terminal device needs to distinguish whether the response message is a response message for the Preamble (i.e., the second response message) or a response message for the PUSCH (i.e., the first response message), so that the terminal device performs a correct operation according to the type of the response message.

In one implementation, the network device may scramble a second PDCCH that schedules a second PDSCH through an RA-RNTI, where the second PDSCH is used to carry a second response message for the Preamble; and, the network device may scramble a first PDCCH that schedules a first PDSCH for carrying a first response message for the PUSCH by a first scrambling code. Therefore, if the terminal device monitors the second PDCCH scrambled with the RA-RNTI, the terminal device may determine that the response message carried on the PDSCH scheduled by the second PDCCH is the second response message for the Preamble, and similarly, if the terminal device monitors the first DCCH scrambled with the first scrambling code, the terminal device may determine that the response message carried on the first PDSCH scheduled by the first PDCCH is the first response message for the PUSCH.

In an implementation manner, the network device and the terminal device may calculate the same RA-RNTI in the same manner, and specifically, the specific implementation manner of calculating the RA-RNTI may be: and determining the RA-RNTI corresponding to the time-frequency resource for sending the Preamble. Specifically, the terminal device (or the network device) may determine the RA-RNTI according to the location information of the time-frequency resource used for sending the Preamble, where the time-frequency resource used for sending the Preamble is referred to as a random access opportunity (RO).

Step S405: and if the RA-RNTI and the first scrambling code are the same, the terminal equipment adjusts the first scrambling code according to a preset offset value to obtain the adjusted first scrambling code.

Specifically, if the RA-RNTI and the first scrambling code are the same, the terminal device may not distinguish the second response message only for the Preamble from the first response message for the PUSCH. To solve this problem, the RA-RNTI and/or the first scrambling code needs to be adjusted so that the adjusted RA-RNTI and the first scrambling code are different. In one implementation, the RA-RNTI may be kept unchanged and the first scrambling code adjusted. Specifically, the first scrambling code may be adjusted according to a preset offset value, so as to obtain the adjusted first scrambling code. In an implementation manner, the terminal device adjusts the first scrambling code according to a preset offset value, and specific implementation manners of obtaining the adjusted first scrambling code may include the following three types:

the first mode is as follows: and taking the sum (or the difference) of the first scrambling code and a preset offset value as the adjusted first scrambling code. In this way, the adjusted first scrambling code may be determined quickly, but in this way, the adjusted first scrambling code may not be in the preset scrambling code set, and if the network device and the terminal device agree to determine the first scrambling code in a blind detection manner, the terminal device may not be able to monitor the PDCCH scrambled with the adjusted first scrambling code.

In one implementation, the adjusted first scrambling code is located in a preset scrambling code set, and in this way, the situation that the terminal device cannot monitor the PDCCH scrambled with the adjusted first scrambling code can be avoided.

The second mode is as follows: if the first scrambling code is obtained by using the operation relation (1), the terminal device may perform addition (or subtraction) on a preset offset value and a dividend in a remainder function (i.e., mod function) in the operation relation (1), and use the obtained value as a new dividend in the remainder function in the operation relation (1) to obtain a new operation relation (1 '), and then use the result of the operation relation (1') as the adjusted first scrambling code.

For example, if the operational relationship used to calculate the first scrambling code is the operational relationship (1) (i.e., X ═ mod (UE _ ID, N) + X_min) Then, the operational relationship (1') may be:

X′＝mod(UE_ID+，N)+x_min(1′)

in the operation relation (1 '), X' is the adjusted first scrambling code, and is the preset offset value, UE _ ID, N and X_minThe definition of (2) is the same as that in the operational relationship (1), and is not described herein again. As can be seen from the operational relationship (1 '), the result of mod (UE _ ID +, N) is smaller than N, so the adjusted first scrambling code (i.e., X ') obtained from the operational relationship (1 ') is located in the preset scrambling code set. In one implementation, the preset offset value may be any value except a value a, where the value a is an integer multiple of the number of scrambling codes (i.e., N) in the preset scrambling code set, i.e., a ═ mN, where m is a positive integer. If mN, the adjusted first scrambling code (X ') obtained from the operational relationship (1') will be the same as the first scrambling code (X) before adjustment obtained from the operational relationship (1), and thus the purpose of adjusting the first scrambling code cannot be achieved.

It should be noted that, if the first scrambling code is obtained by using an operation relationship other than the operation relationship (1), other new operation relationships may be obtained by referring to the method for obtaining the operation relationship (1'), and the adjusted first scrambling code is obtained by calculating the other new operation relationships, which is not described herein again in this embodiment of the present application.

The third mode is as follows: if the first scrambling code is obtained by using the operation relation (1), the terminal device may use the sum (or the difference) of the preset offset value and the first scrambling code obtained according to the operation relation (1) as a new dividend in the remainder function in the operation relation (1), so as to obtain a new operation relation (1 "), and then use the result of the operation relation (1") as the adjusted first scrambling code.

For example, if the operational relationship used to calculate the first scrambling code is the operational relationship (1) (i.e., X ═ mod (UE _ ID, N) + X_min) Then, the operational relationship (1 ") may be:

X″＝mod(X+，N)+x_min(1″)

in the operational relation (1 '), X' is the adjusted first scrambling code, X is the first scrambling code obtained according to the operational relation (1), and is a preset offset value, N and X_minThe definition of (2) is the same as that in the operational relationship (1), and is not described herein again. By operating on the relationship (1 ″), the result of mod (X +6, N)Less than N, so that the adjusted first scrambling code (i.e., X ") obtained according to the operational relationship (1") is in the preset set of scrambling codes.

It should be noted that, if the first scrambling code is obtained by using an operation relationship other than the operation relationship (1), the method for obtaining the operation relationship (1 ") may be referred to obtain another new operation relationship, and the adjusted first scrambling code is obtained through calculation of the other new operation relationship, which is not described herein again in this embodiment of the present application.

Step S406: and the terminal equipment monitors the first PDCCH by using the adjusted first scrambling code.

Specifically, after obtaining the adjusted first scrambling code, the terminal device may monitor the first PDCCH by using the adjusted first scrambling code.

Step S407: and the network equipment obtains the first scrambling code according to at least one of the Preamble, the identifier of the terminal equipment and the time-frequency resource of the PUSCH and a preset operation relation.

It should be noted that the execution process of step S407 can refer to the specific description of step S305 in fig. 3, which is not described herein again.

Step S408: and the network equipment determines the RA-RNTI corresponding to the time-frequency resource for sending the Preamble.

Step S409: and if the RA-RNTI is the same as the first scrambling code, the network equipment adjusts the first scrambling code according to a preset offset value to obtain the adjusted first scrambling code.

It should be noted that the mode of determining, by the network device, the RA-RNTI corresponding to the time-frequency resource for sending the Preamble is the same as the mode of determining, by the terminal device, the RA-RNTI corresponding to the time-frequency resource for sending the Preamble, and the network device adjusts the first scrambling code according to the preset offset value, and the mode of obtaining the adjusted first scrambling code is the same as the mode of obtaining the adjusted first scrambling code by adjusting, by the terminal device, the first scrambling code according to the preset offset value. The execution processes of steps S408 to S409 can be referred to the specific descriptions of steps S404 to S405, which are not described herein again.

It should be further noted that, when the RA-RNTI and the first scrambling code are the same, since there are multiple ways of adjusting the first scrambling code according to the preset offset value, the terminal device and the network device need to agree to adjust the first scrambling code in the same way, so that the adjusted first scrambling code obtained by the terminal device and the adjusted first scrambling code obtained by the network device are the same. In one implementation, the network device may notify the terminal device of the broadcast system information in which way the network device will adjust the first scrambling code, and after the terminal device receives the broadcast system information, the terminal device may adjust the first scrambling code in the same way as the network device does. In other possible implementation manners, the network device and the terminal device may also use other manners (e.g., protocol agreement) besides the broadcast system information to agree on which manner to use to adjust the first scrambling code, which is not limited in this embodiment of the present application.

Step S410: and the network equipment scrambles the first PDCCH according to the adjusted first scrambling code.

Specifically, after obtaining the adjusted first scrambling code, the network device may scramble the first PDCCH according to the adjusted first scrambling code, that is, scramble the CRC of the DCI carried on the first PDCCH according to the adjusted first scrambling code.

Step S411: the network device transmits a first PDCCH for scheduling a first PDSCH.

Step S412: and the terminal equipment receives the first PDSCH from the network equipment according to the monitored first PDCCH.

It should be noted that the execution processes of step S411 to step S412 can be referred to the specific descriptions of step S307 to step S308 in fig. 3, which are not repeated herein.

By implementing the embodiment of the application, when the RA-RNTI and the first scrambling code are the same, the first scrambling code is adjusted through the preset offset value, so that the network equipment scrambles the first PDCCH by adopting the adjusted first scrambling code, and the terminal equipment monitors the first PDCCH by using the adjusted first scrambling code. By using the method, the situation that the terminal equipment cannot distinguish whether the received response information is the response message aiming at the PUSCH or the response message aiming at the Preamble according to the scrambling sequence when the network equipment scrambles the first PDCCH (the first PDCCH is used for scheduling the first PDSCH and the first PDSCH is used for bearing the response message aiming at the PUSCH) by adopting the first scrambling code and scrambles the PDCCH used for scheduling the PDSCH bearing the response message aiming at the Preamble by adopting the RA-RNTI which is the same as the first scrambling code can be avoided.

Please refer to fig. 5, fig. 5 is a flowchart illustrating another random access method provided in this embodiment, where the method briefly describes how a terminal device determines which scrambling code to use to monitor a PDCCH according to whether a second response message carries the scrambling code when a network device successfully detects a Preamble but fails to decode a PUSCH, and the method may include, but is not limited to, the following steps:

step S501: the terminal equipment sends a random access message to the network equipment, wherein the random access message comprises a Preamble and a PUSCH, and the PUSCH carries an identifier of the terminal equipment.

It should be noted that, the execution process of step S501 may respectively refer to the specific description of step S201 in fig. 2, which is not described herein again.

Step S502: and if the network equipment successfully detects the Preamble and the PUSCH decoding fails, generating a second response message aiming at the Preamble, wherein the second response message carries the index uplink scheduling information.

Specifically, if the network device successfully detects the Preamble and fails to decode the PUSCH, the network device may generate a second response message for the Preamble, where the second response message may carry at least one of data of a Preamble index, a TAcommand, uplink scheduling information (UL gram) and a TC-RNTI. The uplink scheduling information is used for configuring a part of time frequency resources for the terminal equipment to use, and the terminal equipment can retransmit the PUSCH or retransmit the Preamble and the PUSCH by using the part of time frequency resources.

Step S503: and the terminal equipment monitors a second PDCCH according to the RA-RNTI, and the second PDCCH is used for scheduling and bearing a second PDSCH of a second response message only aiming at the Preamble.

Specifically, after the terminal device sends the random access message, it can confirm whether the network device successfully detects the Preamble in the random access message and whether the PUSCH is correctly decoded by monitoring the second PDCCH. In the embodiment of the application, if the network device successfully detects the Preamble and fails to decode the PUSCH, the network device may generate a second response message for the Preamble, and scramble a second PDCCH that schedules a second PDSCH carrying the second response message by using an RA-RNTI; if the network device successfully detects the Preamble and successfully decodes the PUSCH, the network device may generate a first response message for the PUSCH code, and scramble the first PDCCH scheduling the first PDSCH carrying the first response message with the first scrambling code. Therefore, after the terminal device sends the random access message, the terminal device may monitor the second PDCCH according to the RA-RNTI, and monitor the first PDCCH according to the first scrambling code, so as to confirm whether the network device successfully detects the Preamble and the PUSCH in the random access message.

Step S504: the network device transmits a second PDCCH for scheduling the second PDSCH, the second PDCCH being scrambled using the RA-RNTI.

Specifically, after the network device generates the second response message, the network device may scramble the second PDCCH for scheduling the second PDSCH using the RA-RNTI, and send the scrambled second PDCCH, where a specific implementation manner of scrambling the second PDCCH using the RA-RNTI is as follows: and scrambling the CRC of the DCI carried on the second PDCCH by using the RA-RNTI. The second PDSCH is used for carrying a second response message, and the second response message carries uplink scheduling information.

Step S505: and if the terminal equipment monitors the second PDCCH scrambled by the RA-RNTI, carrying out uplink transmission according to uplink scheduling information borne by the second PDSCH.

Specifically, if the terminal device monitors a second PDCCH scrambled with the RA-RNTI, the terminal device may receive a second PDSCH from the network device according to the monitored second PDCCH, and demodulate the second PDSCH to obtain a second response message carried by the second PDSCH.

In one implementation, the second response message may be used to notify the terminal device of which data to retransmit, for example, the terminal device may be notified to retransmit the Preamble and the PUSCH, or the terminal device may be notified to retransmit the PUSCH. In this embodiment of the application, the second response message carries uplink scheduling information, and after determining, according to the second response message, that the data needs to be retransmitted, the terminal device may perform uplink transmission through the time-frequency resource indicated by the uplink scheduling information, where the uplink transmission may include retransmission of a PUSCH to the network device, or the uplink transmission may include retransmission of a PUSCH and a Preamble to the network device.

Step S506: and the network equipment detects the uplink transmission on the time-frequency resource indicated by the uplink scheduling information.

Specifically, after the network device sends the second PDCCH, uplink transmission may be detected on the time-frequency resource indicated by the uplink scheduling information, where the uplink transmission may include that the terminal device retransmits a PUSCH to the network device, or the uplink transmission may include that the terminal device retransmits a PUSCH and a Preamble to the network device.

Step S507: the network device generates a response message for the uplink transmission if the uplink transmission is successfully detected.

Specifically, if the network device successfully detects the uplink transmission on the time-frequency resource indicated by the uplink scheduling information, a response message for the uplink transmission is generated. The content included in the response message for uplink transmission may be the same as or different from the content included in the first response information. When the uplink transmission includes the PUSCH and the Preamble, the response message for the uplink transmission may include a response message generated in a case where decoding of the PUSCH in the uplink transmission is successful, or may include a response message generated in a case where detecting of the Preamble in the uplink transmission is successful and decoding of the PUSCH is failed.

Step S508: if the second response message carries a second scrambling code, the terminal equipment monitors a third PDCCH by using the second scrambling code, the third PDCCH is used for scheduling a third PDSCH, and the third PDSCH is used for bearing a response message of uplink transmission scheduled aiming at the uplink scheduling information; and if the second response message does not carry any scrambling code, the terminal equipment monitors a third PDCCH by adopting a third scrambling code.

In one implementation, the second response message may or may not carry the second scrambling code. And when the second response message carries a second scrambling code, the network device is indicated to scramble a third PDCCH of next transmission by using the second scrambling code, wherein the third PDCCH is used for scheduling a third PDSCH, and the third PDSCH is used for carrying a response message of uplink transmission scheduled by the uplink scheduling information. Correspondingly, if the second response message carries the second scrambling code, the terminal device also needs to monitor the third PDCCH by using the second scrambling code.

When the second response message does not carry any scrambling code, it indicates that the network device scrambles a third PDCCH of next transmission by using a third scrambling code, where the third scrambling code may be the first scrambling code or the fourth scrambling code. The method for calculating the first scrambling code can refer to the descriptions of the embodiments in fig. 2 to fig. 4, which are not described herein again. The calculation mode of the fourth scrambling code is as follows: and obtaining a second numerical value according to the position information of the time-frequency resource indicated by the uplink scheduling information, and obtaining a fourth scrambling code according to the second numerical value, the number of the scrambling codes in the preset scrambling code set and a preset operational relationship. The first scrambling code may be calculated by: and obtaining a first numerical value according to the position information of the time-frequency resource of the PUSCH in the random access message, and obtaining a first scrambling code according to the first numerical value, the number of the scrambling codes in the preset scrambling code set and a preset operational relationship. Therefore, the first scrambling code can be calculated according to the position information of the time-frequency resource of the PUSCH, and the fourth scrambling code can be calculated according to the position information of the time-frequency resource indicated by the uplink scheduling information. It should be noted that the first scrambling code and the fourth scrambling code may be the same or different, and this is not limited in this embodiment of the present application.

In other words, the terminal device may monitor the third PDCCH by using a different scrambling code according to whether the second response message carries the scrambling code, and specifically, if the second response message carries the second scrambling code, the third PDCCH is monitored by using the carried second scrambling code; if the second response message does not carry any scrambling code, monitoring a third PDCCH by using the first scrambling code (at this time, the third PDCCH is the same as the first PDCCH in the embodiments of fig. 2 to 4); if the second response message does not carry any scrambling code, a fourth scrambling code can be adopted to monitor a third PDCCH.

Step S509: if the second response message carries a second scrambling code, the network equipment sends a third PDCCH for scheduling a third PDSCH, wherein the third PDCCH uses the second scrambling code for scrambling, and the third PDSCH is used for bearing a response message of uplink transmission scheduled by the uplink scheduling information; if the second response message does not carry any scrambling code, the network device sends a third PDCCH for scheduling the third PDSCH, and the third PDCCH is scrambled by using the third scrambling code.

The third scrambling code may be the first scrambling code or the fourth scrambling code. The way of calculating the fourth scrambling code by the network device is the same as the way of calculating the fourth scrambling code by the terminal device, and the execution process may refer to the specific description in step S508, which is not described herein again.

Step S510: and the terminal equipment receives a third PDSCH from the network equipment according to the monitored third PDCCH.

In one implementation, when the uplink transmission includes at least the PUSCH and the network device successfully decodes the PUSCH in the uplink transmission, the response message for the uplink transmission may include a third response message for the PUSCH. In this case, the third PDCCH monitored by the terminal device corresponds to the first PDSCH in the embodiments of fig. 2 to 4, and the third PDSCH corresponds to the first PDCCH in the embodiments of fig. 2 to 4.

In one implementation, the third PDSCH may carry a fifth scrambling code, and after the terminal device acquires the third PDSCH and correctly demodulates the third PDSCH, the terminal device may store the fifth scrambling code and set the fifth scrambling code as the C-RNTI. The fifth scrambling code may be a scrambling code in a preset scrambling code set, or may also be an RNTI sequence in the value range of the RNTI sequence, which is not limited in the embodiment of the present application. In one implementation, if the second PDSCH carries RNTI1 (i.e., the second response message carries RNTI1), the terminal device may store RNTI1 and set RNTI1 to C-RNTI after obtaining RNTI1 carried on the second PDSCH, and if the third PDSCH carries RNTI2, the terminal device may store RNTI2 and set RNTI2 to C-RNTI after obtaining RNTI2 carried on the third PDSCH. In one implementation, if neither the second PDSCH nor the third PDSCH carries any RNTI, the terminal device may store a scrambling code (e.g., RNTI3) used to scramble the third PDCCH and set the scrambling code as the C-RNTI. In other words, the priority of the scrambling code (e.g., RNTI2) carried by the third PDSCH > the priority of the scrambling code (e.g., RNTI1) carried by the second PDSCH > the priority of the scrambling code (e.g., RNTI3) employed to scramble the third PDCCH.

By implementing the embodiment of the present invention, after the terminal device sends the random access message to the network device, if the network device successfully detects the Preamble, but fails to decode the PUSCH, if the second response message sent to the terminal device by the network device carries the second scrambling code, the terminal device may monitor the third PDSCH using the second scrambling code, and if the second response message does not carry any scrambling code, the terminal device may monitor the third PDSCH using the first scrambling code or the fourth scrambling code, which is beneficial for the terminal device to obtain the third PDSCH according to the third PDCCH, wherein the third PDSCH is used for carrying a response message for uplink transmission scheduled by the uplink scheduling information.

The method of the embodiments of the present application is set forth above in detail and the apparatus of the embodiments of the present application is provided below.

Referring to fig. 6, fig. 6 is a schematic structural diagram of a communication apparatus provided in an embodiment of the present application, where the communication apparatus 60 is configured to perform the steps performed by the terminal device in the method embodiments corresponding to fig. 2 to fig. 5, and the communication apparatus 60 may include:

a sending module 601, configured to send a random access message to a network device, where the random access message includes a random access preamble and a physical uplink shared channel PUSCH;

a monitoring module 602, configured to monitor a first physical downlink control channel PDCCH according to a scrambling code in a preset scrambling code set, where the first PDCCH is used to schedule a first physical downlink shared channel PDSCH carrying a first response message for a PUSCH;

a receiving module 603, configured to receive the first PDSCH from the network device according to the monitored first PDCCH.

In one implementation, the PUSCH may carry an identifier of the terminal device; the monitoring module 602 may be specifically configured to obtain a first scrambling code according to a preset operational relationship and at least one of the random access preamble, the identifier of the terminal device, and the time-frequency resource of the PUSCH, and monitor the first PDCCH according to the first scrambling code, where the preset operational relationship enables the first scrambling code to be located in a preset scrambling code set.

In an implementation manner, the monitoring module 602 may be specifically configured to obtain the first scrambling code according to the identifier of the terminal device, the number of scrambling codes in the preset scrambling code set, and a preset operational relationship.

X＝mod(UE_ID，N)+x_min

wherein X is a first scrambling code, UE _ ID is an identifier of the terminal equipment, N is the number of scrambling codes in a preset scrambling code set, and X_minMod () is the modulo operation for the smallest scrambling code in the preset set of scrambling codes.

In one implementation, when the scrambling codes in the preset scrambling code set are discontinuous scrambling codes, the preset operational relationship is as follows:

index mod (UE _ ID, N) and X_index∈{x₀，…，x_N-1}

In an implementation manner, the monitoring module 602 may be specifically configured to obtain a first numerical value according to location information of a time-frequency resource of a PUSCH; and obtaining a first scrambling code according to the first numerical value, the number of the scrambling codes in the preset scrambling code set and a preset operational relation.

In one implementation, the communications apparatus 60 can further include a determining module 604 and an adjusting module 605; the determining module 604 may be configured to determine an RA-RNTI corresponding to a time-frequency resource used for transmitting the random access preamble; the adjusting module 605 may be configured to adjust the first scrambling code according to a preset offset value if the RA-RNTI and the first scrambling code are the same, so as to obtain the adjusted first scrambling code; the monitoring module 602 is configured to monitor the first PDCCH according to the first scrambling code, and specifically may be configured to monitor the first PDCCH by using the adjusted first scrambling code.

In one implementation, the first response message may carry the TC-RNTI; the communications apparatus 60 can also include a setting module 606, and the setting module 606 can be configured to set the TC-RNTI to the C-RNTI.

In one implementation, the first response message may carry the C-RNTI.

In one implementation, the monitoring module 602 may be further configured to, if a second PDCCH scrambled with an RA-RNTI is monitored, the second PDCCH is used for scheduling a second PDSCH carrying a second response message for the random access preamble, and the second response message carries uplink scheduling information; the monitoring module 602 may further be configured to monitor a third PDCCH by using the second scrambling code if the second response message carries the second scrambling code, where the third PDCCH is used to schedule a third PDSCH, and the third PDSCH is used to carry a response message for uplink transmission scheduled by the uplink scheduling information; and/or if the second response message does not carry any scrambling code, adopting the first scrambling code to monitor the third PDCCH.

It should be noted that details that are not mentioned in the embodiment corresponding to fig. 6 and specific implementation manners of the steps executed by each module may refer to the embodiments shown in fig. 2 to fig. 5 and the foregoing details, and are not described again here.

In one implementation, the relevant functions implemented by the various modules in fig. 6 may be implemented in conjunction with a processor and a transceiver. Referring to fig. 7, fig. 7 is a schematic structural diagram of a terminal device according to an embodiment of the present disclosure, where the terminal device 70 may include a transceiver 701, a processor 702, and a memory 703, and the transceiver 701, the processor 702, and the memory 703 may be connected to each other through one or more communication buses, or may be connected in other manners. The related functions implemented by the sending module 601, the listening module 602, the receiving module 603, the determining module 604, the adjusting module 605 and the setting module 606 shown in fig. 6 may be implemented by the same processor 702, or may be implemented by a plurality of different processors 702.

The transceiver 701 may be used to transmit data and/or signaling as well as receive data and/or signaling. In this embodiment, the transceiver 701 may be configured to transmit a random access message to a network device, and may also be configured to receive a first PDSCH from the network device.

The processor 702 is configured to perform the corresponding functions of the terminal device in the methods described in fig. 2-5. The processor 702 may include one or more processors, for example, the processor 702 may be one or more Central Processing Units (CPUs), Network Processors (NPs), hardware chips, or any combination thereof. In the case where the processor 702 is a CPU, the CPU may be a single-core CPU or a multi-core CPU.

The memory 703 is used for storing program codes and the like. The memory 703 may include volatile memory (volatile), such as Random Access Memory (RAM); the memory 703 may also include a non-volatile memory (non-volatile memory), such as a read-only memory (ROM), a flash memory (flash memory), a Hard Disk Drive (HDD) or a solid-state drive (SSD); the memory 703 may also comprise a combination of memories of the kind described above.

The processor 702 may call program code stored in the memory 703 to perform the following operations:

sending a random access message to network equipment, wherein the random access message comprises a random access lead code and a Physical Uplink Shared Channel (PUSCH);

monitoring a first Physical Downlink Control Channel (PDCCH) according to a scrambling code in a preset scrambling code set, wherein the first PDCCH is used for scheduling a first Physical Downlink Shared Channel (PDSCH) carrying a first response message aiming at a PUSCH;

receiving a first PDSCH from the network device according to the monitored first PDCCH.

In one implementation, the PUSCH may carry an identifier of the terminal device; when the processor 702 monitors the first PDCCH according to the scrambling code in the preset scrambling code set, the following operations may be specifically performed: and obtaining a first scrambling code according to a preset operational relationship and at least one of the random access preamble, the identifier of the terminal equipment and the time-frequency resource of the PUSCH, and monitoring the first PDCCH according to the first scrambling code, wherein the first scrambling code is positioned in a preset scrambling code set by the preset operational relationship.

In one implementation, the processor 702 may specifically perform the following operations: and obtaining a first scrambling code according to the identifier of the terminal equipment, the number of the scrambling codes in the preset scrambling code set and a preset operational relationship.

X＝mod(UE_ID，N)+x_min

index mod (UE _ ID, N) and X_index∈{x₀，…，x_N-1}

In one implementation, the processor 702 may specifically perform the following operations: obtaining a first numerical value according to the position information of the time-frequency resource of the PUSCH; and obtaining a first scrambling code according to the first numerical value, the number of the scrambling codes in the preset scrambling code set and a preset operational relation.

In one implementation, the processor 702 may also perform the following operations: determining RA-RNTI corresponding to time-frequency resources for sending the random access lead code; if the RA-RNTI and the first scrambling code are the same, adjusting the first scrambling code according to a preset offset value to obtain an adjusted first scrambling code; when monitoring the first PDCCH according to the first scrambling code, the method may be specifically configured to monitor the first PDCCH using the adjusted first scrambling code.

In one implementation, the first response message may carry the TC-RNTI; the processor 702 may also perform the following operations: and setting the TC-RNTI as the C-RNTI.

In one implementation, the first response message may carry the C-RNTI.

In one implementation, the processor 702 may also perform the following operations: if a second PDCCH scrambled by using the RA-RNTI is monitored, the second PDCCH is used for scheduling a second PDSCH carrying a second response message aiming at the random access preamble, and the second response message carries uplink scheduling information; if the second response message carries a second scrambling code, monitoring a third PDCCH by using the second scrambling code, wherein the third PDCCH is used for scheduling a third PDSCH, and the third PDSCH is used for bearing a response message of uplink transmission scheduled aiming at the uplink scheduling information; and/or if the second response message does not carry any scrambling code, adopting the first scrambling code to monitor the third PDCCH.

Further, the processor 702 may also execute operations corresponding to the terminal device in the embodiments shown in fig. 2 to fig. 5, which may specifically refer to the description in the method embodiment and will not be described herein again.

Referring to fig. 8, fig. 8 is a schematic structural diagram of a communication apparatus 80 according to an embodiment of the present application, where the communication apparatus 80 is configured to perform the steps performed by the network device in the method embodiments corresponding to fig. 2 to fig. 5, and the communication apparatus 80 may include:

a receiving module 801, configured to receive a random access message, where the random access message includes a random access preamble and a physical uplink shared channel PUSCH;

a generating module 802, configured to generate a first response message for the PUSCH if the PUSCH is successfully decoded;

a sending module 803, configured to send a first physical downlink control channel PDCCH for scheduling a first physical downlink shared channel PDSCH, where the first PDCCH is scrambled by using a scrambling code in a preset scrambling code set, and the first PDSCH is used to carry a first response message for the PUSCH.

In one implementation, the PUSCH may carry an identifier of the terminal device; the communication device 80 may further include: a processing module 804 and a scrambling module 805; the processing module 804 may be configured to obtain a first scrambling code according to a preset operational relationship and at least one of a random access preamble, an identifier of a terminal device, and a time-frequency resource of a PUSCH, where the preset operational relationship enables the first scrambling code to be located in a preset scrambling code set; scrambling module 805 may be configured to scramble the first PDCCH according to a first scrambling code.

In an implementation manner, the processing module 804 may be specifically configured to obtain the first scrambling code according to the identifier of the terminal device, the number of scrambling codes in the preset scrambling code set, and a preset operational relationship.

X＝mod(UE_ID，N)+x_min

index mod (UE _ ID, N) and X_index∈{x₀，…，x_N-1}

In an implementation manner, the processing module 804 may be specifically configured to obtain a first numerical value according to the location information of the time-frequency resource of the PUSCH, and obtain the first scrambling code according to the first numerical value, the number of scrambling codes in the preset scrambling code set, and a preset operational relationship.

In one implementation, the communications apparatus 80 may further include a determining module 806 and an adjusting module 807; the determining module 806 may be configured to determine an RA-RNTI corresponding to a time-frequency resource used for transmitting the random access preamble; the adjusting module 807 may be configured to adjust the first scrambling code according to a preset offset value if the RA-RNTI and the first scrambling code are the same, so as to obtain an adjusted first scrambling code; the scrambling module 805 may be specifically configured to scramble the first PDCCH according to the adjusted first scrambling code.

In one implementation, the first response message may carry the TC-RNTI; the communications apparatus 80 can also include a setting module 808, the setting module 808 can be configured to set the TC-RNTI to a C-RNTI.

In one implementation, the first response message may carry the C-RNTI.

In one implementation, the generating module 802 may be further configured to generate a second response message for the random access preamble if the random access preamble is successfully detected; the sending module 803 may also be configured to send a second PDCCH for scheduling a second PDSCH carrying a second response message, where the second PDCCH is scrambled using an RA-RNTI, and the second response message carries uplink scheduling information; the sending module 803 may further be configured to send a third PDCCH for scheduling a third PDSCH if the second response message carries the second scrambling code, where the third PDCCH is scrambled by using the second scrambling code, and the third PDSCH is used to carry a response message for uplink transmission scheduled by the uplink scheduling information; and/or the transmitting module 803 may be further configured to transmit a third PDCCH for scheduling the third PDSCH if the second response message does not carry any scrambling code, where the third PDCCH is scrambled with the first scrambling code.

It should be noted that details that are not mentioned in the embodiment corresponding to fig. 8 and specific implementation manners of the steps executed by each module may refer to the embodiments shown in fig. 2 to fig. 5 and the foregoing details, and are not described again here.

In one implementation, the relevant functions implemented by the various modules in fig. 8 may be implemented in conjunction with a processor and a transceiver. Referring to fig. 9, fig. 9 is a schematic structural diagram of a network device according to an embodiment of the present disclosure, where the network device 90 may include a transceiver 901, a processor 902, and a memory 903, and the transceiver 901, the processor 902, and the memory 903 may be connected to each other through one or more communication buses, or may be connected through other manners. The related functions implemented by the receiving module 801, the generating module 802, the sending module 803, the processing module 804, the scrambling module 805, the determining module 806, the adjusting module 807 and the setting module 808 shown in fig. 8 may be implemented by the same processor 902, or may be implemented by a plurality of different processors 902.

The transceiver 901 may be used to transmit data and/or signaling as well as receive data and/or signaling. In this embodiment, the transceiver 901 may be configured to transmit a first PDCCH for scheduling a first PDSCH, and may also be configured to receive a random access message.

The processor 902 is configured to perform the respective functions of the network device in the methods described in fig. 2-5. The processor 902 may include one or more processors, for example, the processor 902 may be one or more Central Processing Units (CPUs), Network Processors (NPs), hardware chips, or any combination thereof. In the case where the processor 902 is a single CPU, the CPU may be a single-core CPU or a multi-core CPU.

The memory 903 is used for storing program codes and the like. The memory 903 may include volatile memory (volatile), such as Random Access Memory (RAM); the memory 903 may also include a non-volatile memory (non-volatile memory), such as a read-only memory (ROM), a flash memory (flash memory), a Hard Disk Drive (HDD), or a solid-state drive (SSD); the memory 903 may also comprise a combination of memories of the kind described above.

The processor 902 may call program code stored in the memory 903 to perform the following operations:

receiving a random access message, wherein the random access message comprises a random access lead code and a Physical Uplink Shared Channel (PUSCH);

if the PUSCH is successfully decoded, generating a first response message aiming at the PUSCH;

and sending a first Physical Downlink Control Channel (PDCCH) for scheduling a first Physical Downlink Shared Channel (PDSCH), wherein the first PDCCH is scrambled by using a scrambling code in a preset scrambling code set, and the first PDSCH is used for carrying a first response message aiming at the PUSCH.

In one implementation, the PUSCH may carry an identifier of the terminal device; the processor 902 may also perform the following operations: and obtaining a first scrambling code according to at least one of the random access preamble, the identifier of the terminal equipment and the time-frequency resource of the PUSCH and a preset operational relationship, and scrambling the first PDCCH according to the first scrambling code, wherein the first scrambling code is positioned in a preset scrambling code set by the preset operational relationship.

In one implementation, the processor 902 may specifically perform the following operations: and obtaining a first scrambling code according to the identifier of the terminal equipment, the number of the scrambling codes in the preset scrambling code set and a preset operational relationship.

X＝mod(UE_ID，N)+x_min

index mod (UE _ ID, N) and X_index∈{x₀，…，x_N-1}

In one implementation, the processor 902 may specifically perform the following operations: and obtaining a first numerical value according to the position information of the time-frequency resource of the PUSCH, and obtaining a first scrambling code according to the first numerical value, the number of the scrambling codes in the preset scrambling code set and a preset operational relation.

In one implementation, the processor 902 may also perform the following operations: determining RA-RNTI corresponding to time-frequency resources for sending the random access lead code; if the RA-RNTI and the first scrambling code are the same, adjusting the first scrambling code according to a preset offset value to obtain an adjusted first scrambling code; when the processor 902 performs scrambling on the first PDCCH according to the first scrambling code, the following operations may be specifically performed: and scrambling the first PDCCH according to the adjusted first scrambling code.

In one implementation, the first response message may carry the TC-RNTI; the processor 902 may also perform the following operations: and setting the TC-RNTI as the C-RNTI.

In one implementation, the first response message may carry the C-RNT.

In one implementation, the processor 902 may also perform the following operations: generating a second response message for the random access preamble if the random access preamble is successfully detected; sending a second PDCCH for scheduling a second PDSCH carrying a second response message, wherein the second PDCCH uses RA-RNTI for scrambling, and the second response message carries uplink scheduling information; if the second response message carries a second scrambling code, sending a third PDCCH for scheduling a third PDSCH, wherein the third PDCCH uses the second scrambling code for scrambling, and the third PDSCH is used for carrying a response message of uplink transmission scheduled by the uplink scheduling information; and/or if the second response message does not carry any scrambling code, transmitting a third PDCCH for scheduling the third PDSCH, wherein the third PDCCH is scrambled by using the first scrambling code.

Further, the processor 902 may also execute operations corresponding to the network devices in the embodiments shown in fig. 2 to fig. 5, which may specifically refer to the description in the method embodiments and will not be described herein again.

An embodiment of the present application further provides a computer-readable storage medium, which can be used to store computer software instructions for the communication apparatus in the embodiment shown in fig. 6, and which contains a program designed for the terminal device in the foregoing embodiment.

Embodiments of the present application further provide a computer-readable storage medium, which can be used to store computer software instructions for the communication apparatus in the embodiment shown in fig. 8, and which contains a program designed for executing the network device in the foregoing embodiments.

The computer readable storage medium includes, but is not limited to, flash memory, hard disk, solid state disk.

Embodiments of the present application further provide a computer program product, which, when executed by a computing device, can execute the method designed for the terminal device in the foregoing embodiments of fig. 2 to 5.

Embodiments of the present application further provide a computer program product, which when executed by a computing device, can execute the method designed for the network device in the foregoing embodiments of fig. 2 to 5.

There is also provided in an embodiment of the present application a chip including a processor and a memory, where the memory includes the processor and the memory, and the memory is used to store a computer program, and the processor is used to call and run the computer program from the memory, and the computer program is used to implement the method in the above method embodiment.

Those of ordinary skill in the art would appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. 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 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 or transmitted over a computer-readable storage medium. The computer instructions may be transmitted from one website site, computer, server, or data center to another website site, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.

The 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 random access method, the method comprising:

the method comprises the steps that terminal equipment sends random access information to network equipment, wherein the random access information comprises a random access lead code and a Physical Uplink Shared Channel (PUSCH);

the terminal equipment monitors a first Physical Downlink Control Channel (PDCCH) according to a scrambling code in a preset scrambling code set, wherein the first PDCCH is used for scheduling a first Physical Downlink Shared Channel (PDSCH) carrying a first response message aiming at the PUSCH;

the terminal equipment receives the first PDSCH from the network equipment according to the monitored first PDCCH.

2. The method of claim 1, wherein the PUSCH carries an identity of the terminal device; the terminal device monitors a first PDCCH according to a scrambling code in a preset scrambling code set, and the method comprises the following steps:

the terminal device obtains a first scrambling code according to a preset operational relationship and at least one of the random access preamble, the identifier of the terminal device and a time-frequency resource used for sending the PUSCH, wherein the preset operational relationship enables the first scrambling code to be located in the preset scrambling code set;

and the terminal equipment monitors the first PDCCH according to the first scrambling code.

3. The method according to claim 2, wherein the terminal device obtains the first scrambling code specifically according to the identifier of the terminal device, the number of scrambling codes in the preset scrambling code set, and the preset operational relationship.

4. The method according to claim 3, wherein when the scrambling codes in the preset set of scrambling codes are consecutive scrambling codes, the preset operational relationship is:

X＝mod(UE_ID，N)+x_min

wherein, X is the first scrambling code, UE _ ID is the identifier of the terminal device, N is the number of scrambling codes in the preset scrambling code set, and X_minAnd the minimum scrambling code in the preset scrambling code set is used.

5. The method according to claim 3, wherein when the scrambling codes in the preset set of scrambling codes are discontinuous scrambling codes, the preset operational relationship is:

index mod (UE _ ID, N) and X_index∈{x₀，…，x_N-1}

Wherein the index is an index of a scrambling code in the preset scrambling code set, and the UE _ ID is the identification of the terminal equipment, N is the number of the scrambling codes in the preset scrambling code set, and x_indexIs a scrambling code with index, said { x }₀，…，x_N-1Is the preset scrambling code set, the x₀Is a scrambling code with index 0, said x_N-1Is a scrambling code with an index of N-1, and X is the first scrambling code.

6. The method according to claim 2, wherein the terminal device obtains the first value specifically according to the location information of the time-frequency resource used for transmitting the PUSCH;

and the terminal equipment obtains the first scrambling code according to the first numerical value, the number of the scrambling codes in the preset scrambling code set and the preset operational relationship.

7. The method according to any one of claims 2 to 6, further comprising:

the terminal equipment determines a random access radio network temporary identifier RA-RNTI corresponding to the time-frequency resource used for sending the random access lead code;

if the RA-RNTI and the first scrambling code are the same, the terminal equipment adjusts the first scrambling code according to a preset offset value to obtain an adjusted first scrambling code;

the monitoring, by the terminal device, the first PDCCH according to the first scrambling code includes: and the terminal equipment monitors the first PDCCH by using the adjusted first scrambling code.

8. The method according to any of claims 1 to 7, wherein the first response message carries a temporary cell radio network temporary identity, TC-RNTI;

the method further comprises the following steps: and the terminal equipment sets the TC-RNTI as a cell radio network temporary identifier C-RNTI.

9. The method according to any of claims 1 to 7, wherein the first response message carries a cell radio network temporary identity, C-RNTI.

10. The method according to any one of claims 2 to 9, further comprising:

if the terminal equipment monitors a second PDCCH scrambled by using the RA-RNTI, the second PDCCH is used for scheduling a second PDSCH carrying a second response message aiming at the random access preamble, and the second response message carries uplink scheduling information;

if the second response message carries a second scrambling code, the terminal device monitors a third PDCCH by using the second scrambling code, the third PDCCH is used for scheduling a third PDSCH, and the third PDSCH is used for bearing a response message of uplink transmission scheduled by the uplink scheduling information; and/or

And if the second response message does not carry any scrambling code, the terminal equipment monitors the third PDCCH by adopting the first scrambling code.

11. A communications apparatus, the apparatus comprising:

a sending module, configured to send a random access message to a network device, where the random access message includes a random access preamble and a physical uplink shared channel PUSCH;

a monitoring module, configured to monitor a first physical downlink control channel PDCCH according to a scrambling code in a preset scrambling code set, where the first PDCCH is used to schedule a first physical downlink shared channel PDSCH carrying a first response message for the PUSCH;

a receiving module, configured to receive the first PDSCH from the network device according to the monitored first PDCCH.

12. The apparatus of claim 11, wherein the PUSCH carries an identification of a terminal device;

the monitoring module is specifically configured to obtain a first scrambling code according to a preset operational relationship and at least one of the random access preamble, the identifier of the terminal device, and a time-frequency resource used for sending the PUSCH, and monitor the first PDCCH according to the first scrambling code, where the preset operational relationship enables the first scrambling code to be located in the preset scrambling code set.

13. The apparatus according to claim 12, wherein the monitoring module is specifically configured to obtain the first scrambling code according to the identifier of the terminal device, the number of scrambling codes in the preset scrambling code set, and the preset operational relationship.

14. The apparatus of claim 13, wherein when the scrambling codes in the preset set of scrambling codes are consecutive scrambling codes, the preset operational relationship is:

X＝mod(UE_ID，N)+x_min

15. The apparatus according to claim 13, wherein when the scrambling codes in the preset set of scrambling codes are non-consecutive scrambling codes, the preset operational relationship is:

index mod (UE _ ID, N) and X_index∈{x₀，…，x_N-1}

Wherein the index is an index of a scrambling code in the preset scrambling code set, the UE _ ID is an identifier of the terminal device, N is the number of scrambling codes in the preset scrambling code set, and x is_indexIs a scrambling code with index, said { x }₀，…，x_N-1Is the preset scrambling code set, the x₀Is a scrambling code with index 0, said x_N-1Is a scrambling code with an index of N-1, and X is the first scrambling code.

16. The apparatus according to claim 12, wherein the monitoring module is specifically configured to obtain a first numerical value according to location information of a time-frequency resource used for sending the PUSCH; and obtaining the first scrambling code according to the first numerical value, the number of the scrambling codes in the preset scrambling code set and the preset operational relationship.

17. The apparatus according to any one of claims 12 to 16, wherein the apparatus further comprises a determining module and an adjusting module;

the determining module is used for determining a random access radio network temporary identifier RA-RNTI corresponding to a time-frequency resource used for sending the random access preamble;

the adjusting module is used for adjusting the first scrambling code according to a preset offset value if the RA-RNTI is the same as the first scrambling code to obtain the adjusted first scrambling code;

the monitoring module is configured to, when monitoring the first PDCCH according to the first scrambling code, specifically: and monitoring the first PDCCH by using the adjusted first scrambling code.

18. The apparatus according to any of claims 11 to 17, wherein the first response message carries a temporary cell radio network temporary identity, TC-RNTI;

the device also comprises a setting module which is used for setting the TC-RNTI as a cell radio network temporary identifier C-RNTI.

19. The apparatus according to any of claims 11 to 17, wherein the first response message carries a cell radio network temporary identity, C-RNTI.

20. The apparatus of any one of claims 12 to 19,

the monitoring module is further configured to monitor a second PDCCH scrambled by an RA-RNTI, where the second PDCCH is used to schedule a second PDSCH carrying a second response message for the random access preamble, and the second response message carries uplink scheduling information;

the monitoring module is further configured to monitor a third PDCCH by using the second scrambling code if the second response message carries a second scrambling code, where the third PDCCH is used to schedule a third PDSCH, and the third PDSCH is used to carry a response message of uplink transmission scheduled by the uplink scheduling information; and/or if the second response message does not carry any scrambling code, adopting the first scrambling code to monitor the third PDCCH.

21. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program comprising program instructions that, when executed by a communication apparatus, cause the communication apparatus to perform the method according to any of claims 1-10.