CN111263462A - Random access method and device - Google Patents

Abstract

Embodiments of the present application provide a random access method and apparatus, which relate to the field of communication technologies and are used to solve the problem of how to retransmit the PUSCH part in the MsgA. The method includes: receiving random access response information sent by a network side device, where the random access response information is random access response information in two-step random access, and the random access response message carries a target RV version corresponding to the terminal device; When the terminal device performs two-step random access and falls back to four-step random access, it sends a third message Msg3 to the network side device, where Msg3 is the third message in the four-step random access, and the RV version used by Msg3 is Target RV version. The embodiment of the present invention is used for random access.

Description

Method and device for random access

technical field

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

Background technique

A random access (Random Access) process refers to a process in which a terminal device sends a random access preamble (preamble) to a network side device to try to establish a signaling connection with the network. Random access is used in multiple events such as initial access, Radio Resource Control (RRC) connection recovery, and handover, and is a very important process in a network system.

Contention-based random access includes four-step random access (4-step RACH) and two-step random access (2-step RACH). The four-step random access process includes: the terminal device sends a random access request (Msg1) to the network side device, and the network side sends a random access response (Random Access Response, RAR) to the terminal device after receiving the Msg1 sent by the terminal device. (Msg2), Msg2 carries an uplink grant (UL grant) and a temporary cell radio network temporary identifier (Temple Cell Radio Network TemporaryIdentifier, TC-RNTI) used for scrambling Msg3; the terminal device according to the uplink grant in Msg2 , perform the media access control (Medium Access Control, MAC) layer grouping function to generate a media access control protocol data unit (MAC Protocol DataUnit, MAC PDU), and store the MAC PDU in the Msg3 cache, and then the terminal device mixes the The automatic repeat request (Hybrid Automatic Repeat reQuest, HARQ) process sends the MAC PDU in the Msg3 cache to the network side device; after receiving the Msg3 sent by the terminal device, the network side device sends Msg4 to the terminal device; finally, the terminal device determines whether based on Msg4 The competition was resolved successfully. In addition, in the four-step random access process, if the network side device does not receive the Msg3 sent by the terminal device, the network side device will retransmit the Msg3 using the TC-RNTI carried in the Msg2.

The two-step random access process includes: the terminal device sends random access request information (MsgA) to the network side device, wherein the MsgA includes the information carried by Msg1 and Msg3; after the network side device receives the MsgA sent by the terminal device, it sends the message to the terminal device. The device sends confirmation information (MsgB), wherein the MsgB includes information carried by Msg2 and Msg4, and finally the terminal device determines whether the contention is successfully resolved based on the MsgB. In some cases, the terminal device may need to retransmit the Physical Uplink Shared CHannel (PUSCH) part of the MsgA. However, since the network side does not configure the TC-RNTI for the terminal device, the TC-RNTI cannot be used to schedule the PUSCH in the MsgA. retransmission of the PUSCH part.

To sum up, how to retransmit the PUSCH part in the MsgA is an urgent problem to be solved.

SUMMARY OF THE INVENTION

The embodiments of the present application provide a random access method and apparatus, which are used to solve the problem of how to retransmit the PUSCH part in the MsgA.

In order to solve the above technical problems, this application is implemented as follows:

In a first aspect, an embodiment of the present application provides a random access method, which is applied to a terminal device, and the method includes:

Receive random access response information sent by a network-side device, where the random access response information is random access response information in two-step random access, and the random access response message carries the target RV corresponding to the terminal device Version;

When the terminal device performs two-step random access and falls back to four-step random access, it sends a third message Msg3 to the network side device, where Msg3 is the third message in the four-step random access, and the The RV version used by Msg3 is the target RV version.

In a second aspect, an embodiment of the present application provides a random access method, which is applied to a network side device, and the method includes:

sending a random access response message to the terminal device, where the random access response information is random access response information in the two-step random access, and the random access response message carries the target RV version corresponding to the terminal device;

In the case where the terminal device performs two-step random access and falls back to four-step random access, a third message Msg3 sent by the terminal device is received, where the Msg3 is the third message in the four-step random access, and the The RV version used by Msg3 is the target RV version.

In a third aspect, an embodiment of the present application provides a terminal device, including:

A receiving unit, configured to receive random access response information sent by a network-side device, where the random access response information is random access response information in two-step random access, and the random access response message carries information corresponding to the The target RV version of the end device;

A sending unit, configured to send a third message Msg3 to the network side device when the terminal device performs a two-step random access fallback to a four-step random access, where the Msg3 is the first message in the four-step random access Three messages, the RV version used by the Msg3 is the target RV version.

In a fourth aspect, an embodiment of the present application provides a network side device, including:

A sending unit, configured to send a random access response message to the terminal device, where the random access response message is random access response information in the two-step random access, and the random access response message carries the information corresponding to the terminal device the target RV version;

A receiving unit, configured to receive a third message Msg3 sent by the terminal device when the terminal device performs a two-step random access fallback to a four-step random access, where the Msg3 is the first message in the four-step random access Three messages, the RV version used by the Msg3 is the target RV version.

In a fifth aspect, an embodiment of the present application provides a terminal device, including a processor, a memory, and a computer program stored on the memory and executable on the processor, where the computer program is executed by the processor When implementing the steps of the random access method described in the first aspect.

In a sixth aspect, an embodiment of the present application provides a network-side device, including a processor, a memory, and a computer program stored on the memory and executable on the processor, the computer program being executed by the processor When executed, the steps of the random access method described in the second aspect are implemented.

In a seventh aspect, an embodiment of the present application provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the first aspect or the second aspect is implemented. Steps of a random access method.

In the random access method provided by the embodiment of the present invention, the terminal device first receives the random access response information sent by the network side device, and then when the terminal device performs two-step random access to fall back to four-step random access , sending Msg3 to the network side device; wherein, the random access response information is random access response information in two-step random access, and the random access response message carries the target RV version corresponding to the terminal device, The Msg3 is the third message in the four-step random access, and the RV version used by the Msg3 is the target RV version; since the terminal equipment performs two-step random access and falls back to four-step random access , use the target RV version carried in the random access response information to send the Msg3 to the network side device, so the network side device can determine the retransmission content carried by the Msg3 according to the target RV version, so the embodiment of the present invention can solve the problem of performing a two-step random access How to retransmit the PUSCH part in the MsgA during the four-step random access fallback in the incoming direction, so as to improve the payload resolution probability of the PUSCH part in the MsgA and improve the success rate of random access.

Description of drawings

FIG. 1 is a schematic structural diagram of a possible structure of a communication system involved in an embodiment of the application;

FIG. 2 is one of the interactive flowcharts of the random access method provided by the embodiment of the present application;

FIG. 3 is the second interactive flowchart of the random access method provided by the application embodiment;

FIG. 4 is a schematic structural diagram of a terminal device according to an embodiment of the present application;

FIG. 5 is a schematic diagram of a hardware structure of a terminal device according to an embodiment of the present application;

FIG. 6 is a schematic structural diagram of a network side device according to an embodiment of the present application;

FIG. 7 is a schematic diagram of a hardware structure of a network side device according to an embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

Some terms involved in the embodiments of the present invention are explained below to facilitate understanding of the technical solutions in the embodiments of the present application:

1. Four-step random access (4-step RACH)

4-step RACH (that is, referring to the common RACH process of the prior art) generally includes the following five steps:

Step 1: The terminal device sends Msg1 (random access preamble) to the network side device.

Step 2: After receiving the Msg1, the network side device will send the Msg2 to the terminal device. That is, the random access response (Random Access Response, RAR) message, the RAR is scrambled by a random access radio network temporary identity (Random Access Radio Network Tempory Identity, RA-RNTI), and contains a Backoff Indicator (BI), an uplink Grant (Uplink grant, UL grant), random access preamble identification code (Random Access preamble Identification, RAPID), temporary cell radio network temporary identity (Temple Cell Radio Network Tempory Identity, TC-RNTI) and the like.

Step 3: The terminal device that detects the RAPID corresponding to the preamble sent by itself sends Msg3 according to the position of the UL grant (the terminal device that does not detect the RAPID corresponding to the RAPID sent by itself uses BI to delay access).

Step 4: The terminal device receives the Msg4 sent by the network side, the Msg4 contains a contention resolution identifier, and upgrades the TC-RNTI to a Cell Radio Network Tempory Identity (C-RNTI), and the subsequent network side can use C-RNTI. - RNTI schedules the terminal equipment.

Step 5: Generally, the terminal device needs to send Msg5. That is, the access complete message.

It should be noted that the so-called four-step access mainly refers to the process of completing the first four steps of contention resolution, and the first four steps usually represent the random access process of a conventional wireless network.

Further, for four-step random access (4-step RACH), the random access process of the terminal device includes:

A. Contention-based random access procedure;

B. Non-contention based random access procedure.

For the "contention-based random access process", the terminal equipment sends Msg1 to the network side equipment, that is, the terminal equipment sends a random access request to the network side equipment; the network side equipment; after receiving Msg1, it sends Msg2 to the terminal equipment, that is, the network side equipment The side device sends an RAR message to the terminal device, and the message carries UL grant information. The terminal device performs a medium access control (Medium Access Control, MAC) layer packet function according to the ULgrant in Msg2 to generate a MAC protocol data unit (Protocol Data Unit, PDU), and stores the MAC PDU in the Msg3 cache, and then the terminal The device sends the MAC PDU in the Msg3 cache through a hybrid automatic repeat request (Hybrid Automatic Repeat Request, HARQ) process. After receiving the Msg3, the network side device sends the Msg4 (eg, the contention resolution identifier) to the terminal device. The terminal device receives Msg4 and determines whether the contention is successfully resolved, if successful, the random access process is successful, otherwise the random access process is re-initialized. For the re-initiated random access process, after the terminal device receives the UL grant in Msg2 again, the terminal device directly retrieves the previously stored MAC PDU from the Msg3 cache and sends it through the HARQ process. After the random access process is completed, the terminal device will clear the HARQ buffer of the Msg3 transmission of the random access process.

For the "non-contention-based random access procedure", the terminal device sends Msg1 to the network-side device, that is, the terminal device sends a random access request to the network-side device. After receiving Msg1, the network-side device sends Msg2 to the terminal device, that is, the network-side device sends a RAR message to the terminal device. The message carries the UL grant information and the identification information of the terminal device (for example, the random access preamble of Msg1). )Numbering). If the number of the random access preamble is the same as the number of the random access preamble sent by the Msg1 of the terminal device, the terminal device considers the random access process to be successful, otherwise the random access process is re-initialized.

Each time the terminal device initiates (or re-initiates) the random access process, it will receive strength of reference symbols according to the corresponding downlink signal quality (eg, Synchronous Signal Block, SSB) of each random access Msg1 resource. (Reference Symbol Received Power, RSRP)) to select random access resources, thereby improving the success rate of random access. Therefore, each time the terminal device initiates (or re-initiates) the random access procedure, the terminal device may select "contention-based random access procedure" or "non-contention-based random access procedure".

2. Two-step random access (2-step RACH)

2-step RACH specifically includes the following two steps:

Step 1: The terminal device triggers the 2-step RACH process, and sends the request information (MsgA) to the network side device. For example, it is sent through a physical uplink shared channel (Physical Uplink Shared Channel, PUSCH)+preamble.

Step 2: The network side sends confirmation information (MsgB) to the terminal device.

If the terminal device fails to receive MsgB (failure means that the RAPID or contention resolution identifier corresponding to the MsgA sent by the terminal device has not been received), the terminal device will resend Msg1 (also MsgA, Msg3 or Msg1, depending on the usage scenario) Sure).

Generally, before step 1, the network side device configures the terminal device with configuration information of two-step random access, for example, the configuration information includes: sending resource information corresponding to MsgA and MsgB.

Normally, for ease of understanding, MsgA in the two-step random access includes Msg1 and Msg3 in the four-step random access, and MsgB in the two-step random access includes Msg2 and Msg4 in the four-step random access. Meanwhile, before step 1 is performed, the network side device will configure the terminal device with configuration information of two-step random access, for example, the sending resource information corresponding to MsgA and MsgB.

3. Other terms

The term "and/or" in this article is only an association relationship to describe the associated objects, indicating that there can be three kinds of relationships, for example, A and/or B, it can mean that A exists alone, A and B exist at the same time, and A and B exist independently B these three cases. In addition, the character "/" in this article generally indicates that the related objects before and after are an "or" relationship; in the formula, the character "/" indicates that the related objects are a "division" relationship. If not specified, "plurality" herein refers to two or more.

In order to clearly describe the technical solutions of the embodiments of the present application, in the embodiments of the present application, words such as "first" and "second" are used to distinguish the same items or similar items with basically the same function or effect. A skilled person can understand that words such as "first" and "second" do not limit the quantity and execution order.

In the embodiments of the present application, words such as "exemplary" or "for example" are used to represent examples, illustrations or illustrations. Any embodiments or designs described in the embodiments of the present application as "exemplary" or "such as" should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present the related concepts in a specific manner. In the embodiments of the present application, unless otherwise specified, the meaning of "plurality" refers to two or more.

In some cases, the terminal device may need to retransmit the PUSCH part in the MsgA. However, since the network side does not configure the TC-RNTI for the terminal device, the retransmission of the PUSCH part in the MsgA cannot be scheduled through the TC-RNTI.

In order to solve this problem, embodiments of the present application provide a random access method and device. In the random access method, a terminal device first receives random access response information sent by a network side device, and then performs two steps on the terminal device. When the random access falls back to the four-step random access, Msg3 is sent to the network side device; wherein the random access response information is the random access response information in the two-step random access, and the random access response information is the random access response information in the two-step random access. The response message carries the target RV version corresponding to the terminal device, the Msg3 is the third message in the four-step random access, and the RV version used by the Msg3 is the target RV version; since the terminal device is performing two steps When the random access falls back to the four-step random access, the target RV version carried in the random access response information is used to send the Msg3 to the network side device. Therefore, the network side device can determine the retransmission carried by the Msg3 according to the target RV version. Therefore, the embodiment of the present invention can solve the problem of how to retransmit the PUSCH part in the MsgA when the two-step random access falls back to the four-step random access, thereby improving the payload solution of the PUSCH part in the MsgA probability to improve the success rate of random access.

The technical solutions provided in this application can be applied to various wireless communication systems, for example, a 5G communication system, a future evolution system, or a variety of communication fusion systems, and so on. It can include a variety of application scenarios, such as machine to machine (M2M), D2M, macro-micro communication, enhanced mobile Internet (enhance Mobile Broadband, eMBB), ultra-reliable & low-latency communication (ultra Reliable & Low Latency Communication (uRLLC) and Massive Machine Type Communication (mMTC) and other scenarios. These scenarios include but are not limited to scenarios such as communication between terminal equipment and terminal equipment, or communication between network-side equipment and network-side equipment, or communication between network-side equipment and terminal equipment.

FIG. 1 shows a schematic diagram of a possible architecture of a communication system involved in an embodiment of the present application. As shown in FIG. 1 , the communication system may include: a terminal device 11 and a network side device 12 . The information transmission between the terminal device 11 and the network-side device 12 may be performed through a wireless network.

The terminal device 11 in the communication system shown in FIG. 1 may be a wireless terminal device, and the wireless terminal device may be a device that provides voice and/or other service data connectivity to a user, a handheld device, a computing device or a connection with a wireless communication function. Other processing equipment to wireless modems, in-vehicle equipment, wearable equipment, terminal equipment in future 5G networks or terminal equipment in future evolved PLMN networks, etc. Wireless terminal equipment may communicate with one or more core networks via a Radio Access Network (RAN), and the wireless terminal equipment may be a mobile terminal, such as a mobile phone (or "cellular" phone) and a mobile phone with a mobile terminal. Computers, for example, may be portable, pocket-sized, hand-held, computer-built, or vehicle-mounted mobile devices that exchange language and/or data with wireless access networks, as well as Personal Communication Service (PCS) telephones, cordless telephones , Session Initiation Protocol (Session Initiation Protocol, SIP) phone, Wireless Local Loop (Wireless Local Loop, WLL) station, Personal Digital Assistant (Personal Digital Assistant, PDA) and other devices, wireless terminals can also be mobile devices, UE terminals, access Terminal, Wireless Communication Equipment, Terminal Unit, Terminal Station, Mobile Station, Mobile Station, Remote Station, Remote Station, Remote Terminal, SubscriberUnit, Subscriber Station (Subscriber Station), user agent (User Agent), terminal device, etc. As an example, in the embodiment of the present application, FIG. 1 shows that the terminal device is a mobile phone as an example.

Further, the network side device 12 in the communication system shown in FIG. 1 may be a base station, a core network device, a transmission and reception point (Transmission and Reception Point, TRP), a relay station or an access point, and the like. The network side device may be a base transceiver station (Base Transceiver Station, BTS) in a global system for mobile communication (Global System for Mobile communication, GSM) or a code division multiple access (Code Division Multiple Access, CDMA) network, or a wideband code The NB (NodeB) in Wideband Code Division Multiple Access (WCDMA) may also be an eNB or an eNodeB (evolutional NodeB) in LTE. The network-side device may also be a wireless controller in a cloud radio access network (Cloud Radio Access Network, CRAN) scenario. The network-side device may also be a network-side device in a 5G communication system or a network-side device in a future evolution network. In addition, in systems using different wireless access technologies, the names of devices with base station functions may be different, for example, in the third generation mobile communication (3-Generation, 3G) network, it is called NodeB; In the LTE system, it is called eNodeB; in the fifth generation mobile communication (5G) network, it is called gNB and so on. As communication technology evolves, the name "base station" may change.

An embodiment of the present application provides a random access method. FIG. 2 shows an interaction flowchart of the random access method provided by the embodiment of the present application. As shown in FIG. 2 , the random access method may include:

S21. The network side device sends a random access response message to the terminal device.

Correspondingly, the terminal device receives the random access response message sent by the network side device.

The random access response information is random access response information in two-step random access, and the random access response message carries a target RV version corresponding to the terminal device.

Since the random access response information is the random access response information in the two-step random access, the above step S21 may be that the network side device sends the MsgB in the two-step random access to the terminal device.

S22. In the case where the terminal device performs a two-step random access to a four-step random access fallback, the terminal device sends Msg3 to the network side device.

Correspondingly, the network side device receives the Msg3 sent by the terminal device.

The Msg3 is the third message in the four-step random access, and the RV version used by the Msg3 is the target RV version.

That is, the network side device carries the target RV version in the MsgB in the two-step random access sent to the terminal device, and schedules the Msg3 retransmission through the target RV version.

Further, the terminal device may perform a fallback from two-step random access to four-step random access in the following scenario a and/or scenario b.

Scenario a. The terminal device fails to receive the random access response message (MsgB) in the two-step random access.

Specifically, the failure of the terminal device to receive the random access response message (MsgB) includes: the terminal device fails to receive the RAPID or contention resolution ID corresponding to the random access request message (MsgA) sent by the terminal device, or receives the RAPID without The corresponding contention resolution ID is received, or the terminal receives one or more of the uplink grants preconfigured for uplink Msg3 transmission.

Scenario b. The random access response information carries target information, and the target information is used to instruct the terminal device to perform a two-step random access fallback to a four-step random access.

Specifically, the target information in the above embodiment may implicitly instruct the terminal device to perform a two-step random access to fallback to a four-step random access, or may explicitly instruct the terminal device to perform a two-step random access direction. Four-step random access fallback.

Exemplarily, the specific implementation manner of the target information explicitly instructing the terminal device to perform two-step random access to four-step random access fallback may be: the network side device indicates through X bits that the RAPID corresponds to the RAPID under the RA-RNTI. The terminal equipment performs a two-step random access fallback to a four-step random access; wherein, X may be a positive integer.

Exemplarily, the specific implementation of the target information implicitly instructing the terminal device to perform two-step random access to four-step random access fallback may be: the network side device assigns the RA-RNTI to the terminal corresponding to the RAPID. The device (which has not received the corresponding contention resolution ID) has a UL grant, instructing the terminal device to retransmit the PUSCH part in the MsgA; or the network side device gives other parameters, and can determine that the terminal device retransmits the PUSCH in the MsgA through other combination conditions. PUSCH section.

In the random access method provided by the embodiment of the present invention, the terminal device first receives the random access response information sent by the network side device, and then when the terminal device performs two-step random access to fall back to four-step random access , sending Msg3 to the network side device; wherein, the random access response information is random access response information in two-step random access, and the random access response message carries the target RV version corresponding to the terminal device, The Msg3 is the third message in the four-step random access, and the RV version used by the Msg3 is the target RV version; since the terminal equipment performs two-step random access and falls back to four-step random access , use the target RV version carried in the random access response information to send the Msg3 to the network side device, so the network side device can determine the retransmission content carried by the Msg3 according to the target RV version, so the embodiment of the present invention can solve the problem of performing a two-step random access How to retransmit the PUSCH part in the MsgA during the four-step random access fallback in the incoming direction, so as to improve the payload resolution probability of the PUSCH part in the MsgA and improve the success rate of random access.

Further, as shown in FIG. 3 , before the above step S21 (the network side device sends a random access response message to the terminal device), the random access method provided by the embodiment of the present invention further includes:

S31. The terminal device sends random access request information to the network side device.

Correspondingly, before the network side device sends the random access response message to the terminal device, the network side device further receives the random access request information sent by the terminal device.

Wherein, the random access request information is random access request information in two-step random access.

That is, before the network side device sends the random access response message to the terminal device, the terminal device sends the MsgA in the two-step random access to the network side device.

Exemplarily, the terminal device may send the MsgA to the network side device through PUSCH+Preamble.

In addition, when the terminal device sends random access request information to the network-side device, the terminal device also needs to select an appropriate resource first. That is, before sending random access request information to the network side device, the method further includes:

The terminal device determines the target resource;

The target resource includes at least one of a preamble (Preamble), a random access opportunity (RACH Occasion) and a PUSCH.

Optionally, in the foregoing step S31, the terminal device sends random access request information to the network side device, which may specifically be:

The terminal device sends random access request information to the network side device through the target HARQ process.

That is, the terminal device may send the MsgA in the two-step random access to the network side device through the HARQ process.

On the basis that the terminal device sends the random access request information to the network side device through the target HARQ process, in the above step S22, the terminal device sends Msg3 to the network side device, including:

The terminal device sends the Msg3 to the network side device through the target HARQ process.

That is, the identifier of the HARQ process that the terminal device sends the MsgA in the two-step random access is the same as the identifier of the HARQ process that sends the Msg3 in the four-step random access; or the terminal device retransmits the Msg3 using the same HARQ process as sending the MsgA .

Since the terminal device retransmits Msg3 using the same HARQ process as sending MsgA, the network side device can determine that Msg3 is a retransmission of the random access request information according to the identifier of the HARQ process that sent MsgA and the HARQ process that sent Msg3 .

Optionally, the identifier of the target HARQ process is a preset value, or the identifier of the target HARQ process is configured by the network side device for the terminal device, or the identifier of the target HARQ process is configured by a broadcast message.

That is, the identifier of the HARQ process in which the terminal device sends MsgA in the two-step random access may be preset, or configured for the terminal device by the network side device in advance, or configured for the terminal device by a broadcast message.

Exemplarily, the identifier of the target HARQ process may be 0.

Still further, the Msg3 carries a target MAC PDU, and the target MAC PDU is a MAC PDU carried by the PUSCH in the random access request.

Since the target MAC PDU carried in the Msg3 is the MAC PDU corresponding to the PUSCH in the random access request (MsgA), the transmission to the network side device Msg3 is the retransmission of the PUSCH part in the MsgA.

Since the terminal device needs to carry the target MAC PDU in the Msg3, before sending the Msg3, the terminal device needs to obtain the target MAC PDU first. Exemplarily, in this embodiment of the present invention, the manner in which the terminal device obtains the target MAC PDU may be:

The terminal device reads the target MAC PDU from the HARQ buffer.

It should also be noted that, since the terminal device can obtain the target MAC PDU by reading the target MAC PDU from the HARQ cache, after the random access succeeds, it needs to clear the MAC PDU in the HARQ cache, so as to avoid the The MAC PDU read in the HARQ buffer is the MAC PDU buffered in other random access processes.

Some embodiments of the present invention may divide the terminal device into functional modules according to the foregoing method examples. For example, each function module may be divided into each function, or two or more functions may be integrated into one module. The above-mentioned integrated modules can be implemented in the form of hardware, and can also be implemented in the form of software function modules. It should be noted that the division of modules in some embodiments of the present invention is schematic, and is only a logical function division, and other division methods may be used in actual implementation.

In the case of using an integrated unit, FIG. 4 shows a possible schematic structural diagram of the terminal device involved in the above embodiment, and the terminal device 400 includes:

The receiving unit 41 is configured to receive the random access response information sent by the network side device, the random access response information is the random access response information in the two-step random access, and the random access response message carries the corresponding information. the target RV version of the end device;

The sending unit 42 is configured to send a third message Msg3 to the network side device when the terminal device performs a two-step random access fallback to a four-step random access, where the Msg3 is one of the four-step random access In the third message, the RV version used by the Msg3 is the target RV version.

Optionally, the sending unit 42 is further configured to send random access request information to the network side device before the receiving unit receives the random access response information sent by the network side device, the random access request The information is random access request information in the two-step random access.

Optionally, the sending unit 42 is specifically configured to send random access request information to the network side device through a target HARQ process.

Optionally, the sending unit 42 is specifically configured to send the Msg3 to the network side device through the target HARQ process.

Optionally, the identifier of the target HARQ process is a preset value, or the identifier of the target HARQ process is configured by the network side device for the terminal device, or the identifier of the target HARQ process is configured by a broadcast message.

Optionally, the identifier of the target HARQ process is 0.

Optionally, the Msg3 carries a target medium access control MAC protocol data unit PDU, and the target MAC PDU is a MAC PDU carried by the physical uplink shared channel PUSCH in the random access request.

Optionally, the sending unit 42 is further configured to read the target MAC PDU from the HARQ buffer before sending the third message Msg3 to the network side device.

Optionally, the random access request information carries a target preamble;

The random access response message also carries a target uplink grant, where the target uplink grant is an uplink grant corresponding to the identifier of the target preamble.

Optionally, the sending unit 42 is specifically configured to send the Msg3 to the network side device by using the target uplink grant.

Optionally, the sending unit 42 is further configured to determine the target resource before sending random access request information to the network side device;

Wherein, the target resource includes: at least one of a preamble, a random access opportunity and a PUSCH.

Optionally, the random access response information further carries target information, where the target information is used to instruct the terminal device to perform a two-step random access fallback to a four-step random access.

Optionally, the scenario in which the terminal device is triggered to perform a two-step random access fallback to a four-step random access includes:

The terminal device fails to receive the random access response message;

and / or;

The random access response information carries target information, and the target information is used to instruct the terminal device to perform a two-step random access fallback to a four-step random access.

The terminal device first receives the random access response information sent by the network side device, and then sends Msg3 to the network side device when the terminal device performs a two-step random access fallback to a four-step random access; wherein, the The random access response information is the random access response information in the two-step random access, the random access response message carries the target RV version corresponding to the terminal device, and the Msg3 is the first random access response in the four-step random access. Three messages, the RV version used by the Msg3 is the target RV version; because the terminal device uses the target RV carried in the random access response information when performing the two-step random access fallback to the four-step random access The version sends Msg3 to the network side device, so the network side device can determine the retransmission content carried by Msg3 according to the target RV version. Therefore, the embodiment of the present invention can solve the problem of how to perform the two-step random access and fall back to the four-step random access. The problem of retransmitting the PUSCH part in the MsgA, thereby improving the payload solution probability of the PUSCH part in the MsgA, and improving the success rate of random access.

5 is a schematic diagram of the hardware structure of a terminal device implementing various embodiments of the present application. The terminal device 100 includes but is not limited to: a radio frequency unit 101, a network module 102, an audio output unit 103, an input unit 104, a sensor 105, and a display unit 106 , the user input unit 107 , the interface unit 108 , the memory 109 , the processor 110 , and the power supply 111 and other components.

Further, the terminal device 100 further includes: a computer program stored in the memory 109 and executable on the processor 110 , when the computer program is executed by the processor 110 , each process performed by the terminal device in the above random access method is implemented.

Specifically, the processor 110 is configured to control the radio frequency unit 101 to receive the random access response information sent by the network side device, and to perform a two-step random access fallback to a four-step random access fallback on the terminal device. In this case, the radio frequency unit 101 is controlled to send the third message Msg3 to the network side device.

The random access response information is the random access response information in the two-step random access, the random access response message carries the target RV version corresponding to the terminal device, and the Msg3 is the four-step random access. The third message in the input, the RV version used by the Msg3 is the target RV version.

The terminal device first receives the random access response information sent by the network side device, and then sends Msg3 to the network side device when the terminal device performs a two-step random access fallback to a four-step random access; wherein, the The random access response information is the random access response information in the two-step random access, the random access response message carries the target RV version corresponding to the terminal device, and the Msg3 is the first random access response in the four-step random access. Three messages, the RV version used by the Msg3 is the target RV version; because the terminal device uses the target RV carried in the random access response information when performing the two-step random access fallback to the four-step random access The version sends Msg3 to the network side device, so the network side device can determine the retransmission content carried by Msg3 according to the target RV version. Therefore, the embodiment of the present invention can solve the problem of how to perform the two-step random access and fall back to the four-step random access. The problem of retransmitting the PUSCH part in the MsgA, thereby improving the payload solution probability of the PUSCH part in the MsgA, and improving the success rate of random access.

It should also be noted that the terminal device 100 shown in FIG. 5 can implement each process implemented by the terminal device in the above random method, and can achieve the same technical effect. To avoid repetition, details are not repeated here.

Those skilled in the art can understand that the structure of the terminal device shown in FIG. 5 does not constitute a limitation on the terminal device, and the terminal device may include more or less components than the one shown, or combine some components, or different components layout. In the embodiments of the present application, the terminal devices include but are not limited to mobile phones, tablet computers, notebook computers, handheld computers, vehicle-mounted terminals, wearable devices, and pedometers.

It should be understood that, in this embodiment of the present application, the radio frequency unit 101 may be used for receiving and sending signals during sending and receiving of information or during a call. Specifically, after receiving the downlink data from the base station, it is processed by the processor 110; The uplink data is sent to the base station. Generally, the radio frequency unit 101 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, and the like. In addition, the radio frequency unit 101 can also communicate with the network and other devices through a wireless communication system.

The terminal device provides the user with wireless broadband Internet access through the network module 102, such as helping the user to send and receive emails, browse web pages, and access streaming media.

The audio output unit 103 may convert audio data received by the radio frequency unit 101 or the network module 102 or stored in the memory 109 into audio signals and output as sound. Also, the audio output unit 103 may also provide audio output related to a specific function performed by the terminal device 100 (eg, call signal reception sound, message reception sound, etc.). The audio output unit 103 includes a speaker, a buzzer, a receiver, and the like.

The input unit 104 is used to receive audio or video signals. The input unit 104 may include a graphics processor (Graphics Processing Unit, GPU) 1041 and a microphone 1042. The graphics processor 1041 captures images of still pictures or videos obtained by an image capture device (such as a camera) in a video capture mode or an image capture mode data is processed. The processed image frames may be displayed on the display unit 106 . The image frames processed by the graphics processor 1041 may be stored in the memory 109 (or other storage medium) or transmitted via the radio frequency unit 101 or the network module 102 . The microphone 1042 can receive sound and can process such sound into audio data. The processed audio data can be converted into a format that can be transmitted to a mobile communication base station via the radio frequency unit 101 for output in the case of a telephone call mode.

The terminal device 100 also includes at least one sensor 105, such as a light sensor, a motion sensor, and other sensors. Specifically, the light sensor includes an ambient light sensor and a proximity sensor, wherein the ambient light sensor can adjust the brightness of the display panel 1061 according to the brightness of the ambient light, and the proximity sensor can turn off the display panel 1061 and the display panel 1061 when the terminal device 100 moves to the ear. / or backlight. As a type of motion sensor, the accelerometer sensor can detect the magnitude of acceleration in all directions (generally three axes), and can detect the magnitude and direction of gravity when stationary, and can be used to identify the posture of the terminal device (such as horizontal and vertical screen switching, related games , magnetometer attitude calibration), vibration recognition related functions (such as pedometer, tapping), etc.; the sensor 105 may also include a fingerprint sensor, a pressure sensor, an iris sensor, a molecular sensor, a gyroscope, a barometer, a hygrometer, a thermometer, Infrared sensors, etc., are not repeated here.

The display unit 106 is used to display information input by the user or information provided to the user. The display unit 106 may include a display panel 1061, and the display panel 1061 may be configured in the form of a liquid crystal display (LCD), an organic light-emitting diode (OLED), or the like.

The user input unit 107 may be used to receive input numerical or character information and generate key signal input related to user settings and function control of the terminal device. Specifically, the user input unit 107 includes a touch panel 1071 and other input devices 1072 . The touch panel 1071, also referred to as a touch screen, can collect the user's touch operations on or near it (such as the user's finger, stylus, etc., any suitable object or attachment on or near the touch panel 1071). operate). The touch panel 1071 may include two parts, a touch detection device and a touch controller. Among them, the touch detection device detects the user's touch orientation, detects the signal brought by the touch operation, and transmits the signal to the touch controller; the touch controller receives the touch information from the touch detection device, converts it into contact coordinates, and then sends it to the touch controller. To the processor 110, the command sent by the processor 110 is received and executed. In addition, the touch panel 1071 can be implemented in various types such as resistive, capacitive, infrared, and surface acoustic waves. In addition to the touch panel 1071 , the user input unit 107 may also include other input devices 1072 . Specifically, other input devices 1072 may include, but are not limited to, physical keyboards, function keys (such as volume control keys, switch keys, etc.), trackballs, mice, and joysticks, which will not be described herein again.

Further, the touch panel 1071 can be covered on the display panel 1061. When the touch panel 1071 detects a touch operation on or near it, it transmits it to the processor 110 to determine the type of the touch event, and then the processor 110 determines the type of the touch event according to the touch The type of event provides corresponding visual output on display panel 1061 . Although in FIG. 5, the touch panel 1071 and the display panel 1061 are used as two independent components to realize the input and output functions of the terminal device, in some embodiments, the touch panel 1071 and the display panel 1061 may be integrated The input and output functions of the terminal device are implemented, which is not specifically limited here.

The interface unit 108 is an interface for connecting an external device to the terminal device 100 . For example, external devices may include wired or wireless headset ports, external power (or battery charger) ports, wired or wireless data ports, memory card ports, ports for connecting devices with identification modules, audio input/output (I/O) ports, video I/O ports, headphone ports, and more. The interface unit 108 may be used to receive input from external devices (eg, data information, power, etc.) and transmit the received input to one or more elements within the terminal device 100 or may be used between the terminal device 100 and external Transfer data between devices.

The memory 109 may be used to store software programs as well as various data. The memory 109 may mainly include a stored program area and a stored data area, wherein the stored program area may store an operating system, an application program (such as a sound playback function, an image playback function, etc.) required for at least one function, and the like; Data created by the use of the mobile phone (such as audio data, phone book, etc.), etc. Additionally, memory 109 may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device.

The processor 110 is the control center of the terminal equipment, using various interfaces and lines to connect various parts of the entire terminal equipment, by running or executing the software programs and/or modules stored in the memory 109 and calling the data stored in the memory 109, Execute various functions of the terminal equipment and process data, so as to monitor the terminal equipment as a whole. The processor 110 may include one or more processing units; preferably, the processor 110 may integrate an application processor and a modem processor, wherein the application processor mainly processes the operating system, user interface, and application programs, etc., and the modem The processor mainly handles wireless communication. It can be understood that, the above-mentioned modulation and demodulation processor may not be integrated into the processor 110 .

The terminal device 100 may also include a power supply 111 (such as a battery) that supplies power to various components. Preferably, the power supply 111 may be logically connected to the processor 110 through a power management system, so as to manage charging, discharging, and power consumption management through the power management system. Function.

In addition, the terminal device 100 includes some unshown functional modules, which will not be repeated here.

In some embodiments of the present invention, functional modules may be divided into network-side devices according to the foregoing method examples. For example, each function module may be divided into each function, or two or more functions may be integrated into one module. The above-mentioned integrated modules can be implemented in the form of hardware, and can also be implemented in the form of software function modules. It should be noted that the division of modules in some embodiments of the present invention is schematic, and is only a logical function division, and other division methods may be used in actual implementation.

In the case of using an integrated unit, FIG. 6 shows a possible schematic structural diagram of the network side device involved in the above embodiment, and the network side device 600 includes:

The sending unit 61 is configured to send a random access response message to the terminal device, where the random access response information is random access response information in the two-step random access, and the random access response message carries information corresponding to the terminal. The target RV version of the device;

The receiving unit 62 is configured to receive a third message Msg3 sent by the terminal device when the terminal device performs a two-step random access fallback to a four-step random access, where the Msg3 is one of the four-step random access In the third message, the RV version used by the Msg3 is the target RV version.

Optionally, the receiving unit 62 is further configured to receive random access request information sent by the terminal device before the sending unit sends a random access response message to the terminal device, where the random access request information is: Random access request information in two-step random access.

Optionally, the random access response information further carries target information, where the target information is used to instruct the terminal device to perform a two-step random access fallback to a four-step random access.

An embodiment of the present application further provides a network side device. Referring to FIG. 7 , the network side device includes: a processor 71, a memory 72, a computer program stored in the memory 72 and running on the processor 71, the computer When the program is executed by the processor 71, each process performed by the network-side device in the above random access method can be implemented, and the same technical effect can be achieved. To avoid repetition, details are not repeated here.

Embodiments of the present application further provide a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, implements multiple processes of the random access method in the foregoing embodiment, and can To achieve the same technical effect, in order to avoid repetition, details are not repeated here. Among them, the computer-readable storage medium, such as a read-only memory (Read-Only Memory, ROM for short), a random access memory (Random Access Memory, RAM for short), a magnetic disk or an optical disk, etc.

It should be noted that, herein, the terms "comprising", "comprising" or any other variation thereof are intended to encompass non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements, It also includes other elements not expressly listed or inherent to such a process, method, article or apparatus. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in a process, method, article or apparatus that includes the element.

From the description of the above embodiments, those skilled in the art can clearly understand that the method of the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course can also be implemented by hardware, but in many cases the former is better implementation. Based on this understanding, the technical solution of the present application can be embodied in the form of a software product in essence or in a part that contributes to the prior art, and the computer software product is stored in a storage medium (such as ROM/RAM, magnetic disk, CD-ROM), including several instructions to make a terminal (which may be a mobile phone, a computer, a server, an air conditioner, or a network side device, etc.) execute the methods described in the various embodiments of this application.

The embodiments of the present application have been described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific embodiments, which are merely illustrative rather than restrictive. Under the inspiration of this application, without departing from the scope of protection of the purpose of this application and the claims, many forms can be made, which all fall within the protection of this application.

Claims (35)

1. A random access method, characterized in that, applied to a terminal device, the method comprising: Receive random access response information sent by a network-side device, where the random access response information is random access response information in two-step random access, and the random access response message carries the target RV corresponding to the terminal device Version; When the terminal device performs two-step random access and falls back to four-step random access, it sends a third message Msg3 to the network side device, where Msg3 is the third message in the four-step random access, and the The RV version used by Msg3 is the target RV version. 2. The method according to claim 1, wherein before receiving the random access response information sent by the network side device, the method further comprises: Send random access request information to the network side device, where the random access request information is random access request information in two-step random access. 3. The method according to claim 2, wherein the sending random access request information to the network side device comprises: Send random access request information to the network side device through the target HARQ hybrid automatic repeat process. 4. The method according to claim 3, wherein the sending Msg3 to the network side device comprises: Send the Msg3 to the network side device through the target HARQ process. 5. The method according to claim 4, characterized in that, The identifier of the target HARQ process is a preset value, or the identifier of the target HARQ process is configured by the network side device for the terminal device, or the identifier of the target HARQ process is configured by a broadcast message. 6 . The method according to claim 5 , wherein the identifier of the target HARQ process is 0. 7 . 7 . The method according to claim 2 , wherein the Msg3 carries a target medium access control (MAC) protocol data unit (PDU), and the target MAC PDU is the physical uplink shared channel (PUSCH) in the random access request. 8 . Bearer MAC PDU. 8. The method according to claim 7, wherein before sending the third message Msg3 to the network side device, the method further comprises: Read the target MAC PDU from the HARQ buffer. 9. The method of claim 2, wherein The random access request information carries a target preamble; The random access response message also carries a target uplink grant, where the target uplink grant is an uplink grant corresponding to the identifier of the target preamble. 10. The method according to claim 9, wherein the sending the third message Msg3 to the network side device comprises: Send the Msg3 to the network side device using the target uplink grant. 11. The method according to claim 2, wherein before sending random access request information to the network side device, the method further comprises: A target resource is determined, where the target resource includes at least one of a preamble, a random access opportunity, and a PUSCH. 12. The method according to any one of claims 1 to 11, wherein the random access response information further carries target information, and the target information is used to instruct the terminal device to perform a two-step random access to a four-step random access. Access fallback. The method according to any one of claims 1 to 11, wherein triggering the terminal device to perform a two-step random access fallback to a four-step random access scenario comprises: The terminal device fails to receive the random access response message; and / or; The random access response information carries target information, and the target information is used to instruct the terminal device to perform a two-step random access fallback to a four-step random access. 14. A random access method, characterized in that it is applied to a network side device, the method comprising: sending a random access response message to the terminal device, where the random access response information is random access response information in the two-step random access, and the random access response message carries the target RV version corresponding to the terminal device; In the case where the terminal device performs two-step random access and falls back to four-step random access, a third message Msg3 sent by the terminal device is received, where the Msg3 is the third message in the four-step random access, and the The RV version used by Msg3 is the target RV version. 15. The method according to claim 14, wherein before sending a random access response message to the terminal device, the method further comprises: Receive random access request information sent by the terminal device, where the random access request information is random access request information in two-step random access. The method according to claim 14 or 15, wherein the random access response information further carries target information, and the target information is used to instruct the terminal device to perform a two-step random access to a four-step random access Random access fallback. 17. A terminal device, comprising: A receiving unit, configured to receive random access response information sent by a network-side device, where the random access response information is random access response information in two-step random access, and the random access response message carries information corresponding to the The target RV version of the end device; A sending unit, configured to send a third message Msg3 to the network side device when the terminal device performs a two-step random access fallback to a four-step random access, where the Msg3 is the first message in the four-step random access Three messages, the RV version used by the Msg3 is the target RV version. 18. The terminal device according to claim 17, wherein, The sending unit is further configured to send random access request information to the network side device before the receiving unit receives the random access response information sent by the network side device, where the random access request information is a two-step random access request Random access request information during access. 19. The terminal device according to claim 18, wherein, The sending unit is specifically configured to send random access request information to the network side device through the target HARQ hybrid automatic repeat process. 20. The terminal device according to claim 19, wherein, The sending unit is specifically configured to send the Msg3 to the network side device through the target HARQ process. 21. The terminal device according to claim 20, wherein, The identifier of the target HARQ process is a preset value, or the identifier of the target HARQ process is configured by the network side device for the terminal device, or the identifier of the target HARQ process is configured by a broadcast message. 22 . The terminal device according to claim 21 , wherein the identifier of the target HARQ process is 0. 23 . 23 . The terminal device according to claim 18 , wherein the Msg3 carries a target medium access control (MAC) protocol data unit (PDU), and the target MAC PDU is a physical uplink shared channel in the random access request. 24 . MAC PDU carried by PUSCH. The terminal device according to claim 23, wherein the sending unit is further configured to read the target MAC PDU from the HARQ buffer before sending the third message Msg3 to the network side device. 25. The terminal device according to claim 18, wherein the random access request information carries a target preamble; The random access response message also carries a target uplink grant, where the target uplink grant is an uplink grant corresponding to the identifier of the target preamble. 26. The terminal device according to claim 25, wherein, The sending unit is specifically configured to send the Msg3 to the network side device by using the target uplink grant. 27. The terminal device according to claim 18, wherein the sending unit is further configured to determine the target resource before sending random access request information to the network side device; Wherein, the target resource includes: at least one of a preamble, a random access opportunity and a PUSCH. 28. The terminal device according to any one of claims 16 to 26, wherein the random access response information further carries target information, and the target information is used to instruct the terminal device to perform two-step random access. Incoming four-step random access fallback. 29. The terminal device according to any one of claims 16 to 26, wherein a scenario in which the terminal device is triggered to perform a two-step random access fallback to a four-step random access comprises: The terminal device fails to receive the random access response message; and / or; The random access response information carries target information, and the target information is used to instruct the terminal device to perform a two-step random access fallback to a four-step random access. 30. A network side device, comprising: A sending unit, configured to send a random access response message to the terminal device, where the random access response message is random access response information in the two-step random access, and the random access response message carries the information corresponding to the terminal device the target RV version; A receiving unit, configured to receive a third message Msg3 sent by the terminal device when the terminal device performs a two-step random access fallback to a four-step random access, where the Msg3 is the first message in the four-step random access Three messages, the RV version used by the Msg3 is the target RV version. 31. The network side device according to claim 30, wherein, The receiving unit is further configured to receive random access request information sent by the terminal device before the sending unit sends a random access response message to the terminal device, where the random access request information is two-step random access Random access request information in . 32. The network-side device according to claim 30 or 31, wherein the random access response information further carries target information, and the target information is used to instruct the terminal device to perform a two-step random access direction. Four-step random access fallback. 33. A terminal device, characterized in that it comprises a processor, a memory and a computer program stored on the memory and running on the processor, the computer program being executed by the processor to achieve the right Steps of the random access method according to any one of requirements 1 to 13. 34. A network side device, characterized in that it comprises a processor, a memory and a computer program stored on the memory and running on the processor, the computer program being executed by the processor to achieve the following: Steps of the random access method according to any one of claims 14 to 16. 35. A computer-readable storage medium, characterized in that, a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the randomization method according to any one of claims 1 to 16 is realized. The steps of the access method.

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