CN110831236A - Random access method and device - Google Patents

Abstract

A method and apparatus for random access are provided, the method includes: a first node sends a random access preamble sequence to a network device; determines that a response message from the network device is not received; A first timing advance, the first timing advance is determined by a first parameter, and the first parameter includes: a timing advance offset of the random access preamble sequence sent by the first node compared to the previous time the random access preamble sequence was sent; A timing advance sends the random access preamble sequence to the network device. Compared with the random access configuration in the existing process of using the terminal device to send the preamble sequence before random access, the embodiment of the present application sends the random access preamble sequence to the network device in advance for the long-distance node beyond the coverage of the cell, Helps to improve the probability of successful access to the network.

Description

Method and device for random access

technical field

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

Background technique

Random Access (Random Access) refers to the process of establishing a wireless link between a terminal device and a network device. After the random access process is completed, the terminal device and the network device can transmit and receive data.

In the fifth generation mobile networks (5th generation mobile networks or 5th generation wireless systems, 5G), the integrated access and backhaul (integrated access and backhaul, IAB) node is the evolution node of the relay technology. In wireless communication networks, relay nodes are usually used to achieve extended coverage or blind area coverage, or to improve system capacity. When relay nodes are used to achieve extended coverage, IAB nodes are usually deployed at the cell edge or further away. If the IAB node follows the process of randomly accessing the network by the terminal equipment when accessing the network, the IAB node fails to access because the distance between the IAB node and the upper node or base station is far beyond the coverage of the cell. Therefore, how to increase the probability of an IAB node accessing the network is a problem that needs to be considered in the current IAB standardization.

SUMMARY OF THE INVENTION

In view of this, the present application provides a method and device for random access, which helps to improve the probability of random access of a remote node by sending a random access preamble sequence in advance.

A first aspect provides a random access method, comprising: a first node sending a random access preamble sequence to a network device; the first node determining that a response message from the network device has not been received; the first node determining to resend a random access message The first timing advance of the access preamble sequence, the first timing advance is determined by a first parameter, and the first parameter includes: a time advance offset of the random access preamble sequence sent by the first node compared to the previous time the random access preamble sequence was sent The first node sends the random access preamble sequence to the network device according to the first timing advance. Compared with the normal process of using the terminal device to send the preamble sequence before random access, the embodiment of the present application, for the remote node beyond the coverage of the cell, sends the random access preamble sequence to the network device in advance, which helps to improve the successful access. network probability.

In a possible implementation, the method further includes:

The first node receives a random access response RAR message from the network device, where the RAR message includes a second timing advance;

The first node sends a notification message to the network device according to the timing advance offset and the second timing advance, where the notification message includes information for the network device to update the second timing advance.

Since the network device does not know how long the first node has sent the random access preamble in advance, in order to obtain correct uplink reception or downlink transmission timing adjustment, the network device needs to obtain correct timing advance information. Therefore, the first node informs the network device of the correct timing advance information through the notification message.

Optionally, the notification message includes information on cumulative values of multiple timing advance offsets for sending random access preamble sequences multiple times; or, the notification message includes multiple timing advance offsets for sending random access preamble sequences multiple times. The third timing advance is obtained by adding the accumulated value of the shift amount to the second timing advance.

Therefore, the first node needs to send the information of the accumulated value of the time advance offset sent in advance to the network device, or directly combine the accumulated value of multiple time advance offsets of multiple random access preamble sequences with the second time The third timing advance obtained by adding the advance is sent to the network device.

In a possible implementation manner, the first parameter further includes: the number of times of sending the maximum applied time advance offset for sending the same random access preamble sequence;

The first node sends a random access preamble sequence to the network device according to the first timing advance, including:

The first node determines that the number of times of sending the random access preamble sequence is less than or equal to the number of times of sending the maximum applied time advance offset;

The first node adjusts the sending timing, and the adjusted sending timing includes advancing the sending time relative to the previous sending advance time by an offset amount;

The first node sends the random access preamble sequence to the network device according to the adjusted sending timing.

Wherein, "less than or equal to" can be interpreted as "<" or "≤".

Here, the first node uses the time advance offset to send the random access preamble sequence to the network device with a number of times less than or equal to the number of times of sending the maximum applied time advance offset. If the first node successfully receives the response message from the network device after sending the random access preamble sequence once by using the time advance offset, the first node does not need to send the random access preamble sequence again.

In a possible implementation manner, the method further includes: the first node receives the first parameter from the second node, and the second node is an upper-level node of the first node.

In a second aspect, a random access method is provided, including: a first node receives access configuration information from a network device, where the access configuration information includes: time-frequency resources of a random access preamble sequence, and a time-frequency resource using the time-frequency resources. Node type; the first node determines to use the access configuration information to perform random access according to the access configuration information; the first node sends a random access preamble sequence to the network device. Therefore, by providing access configuration information for the first node, the success rate of random access of the first node is improved.

Optionally, the node type includes: a relay node or a terminal device.

In a possible implementation manner, the time-frequency resources include at least one random access time-domain resource and frequency-domain resource in one or more radio frames; or,

The time-frequency resources include time-domain resources and frequency-domain resources of at least one random access in one or more radio frames, wherein the access configuration information further includes period information of the time-frequency resources; or,

The time-frequency resources include multiple random access time-domain resources and frequency-domain resources in one or more radio frames, and the access configuration information further includes: at least one time-frequency resource and period information corresponding to the at least one time-frequency resource.

In a possible implementation manner, the first node determines to use the access configuration information to perform random access according to the access configuration information, including:

The first node determines, according to the node type, that the first node uses time-frequency resources to perform random access.

Optionally, the first node determining, according to the node type, that the first node uses the access configuration information to perform random access, including: the first node determining that the node type is a relay node.

Optionally, the method further includes: the first node determines that the node type is a terminal device; and the first node determines not to perform random access on the access configuration information. Here, if the first node is determined to be a terminal device, the terminal device does not perform random access on the random access resource configured by the network device for the relay node.

In a possible implementation manner, the time-frequency resources of the random access preamble sequence include: resources that support the terminal device to send the random access preamble sequence using a first random access preamble format, where the first random access preamble format is the same as The coverage ranges supported by the second random access preamble format used by the terminal equipment are different. Here, if the first node is determined to be a terminal device, the terminal device may use a long-format random access preamble (ie, a random access preamble with a wider coverage than the normal format) to perform random access.

In a possible implementation manner, the first node sends a random access preamble sequence to the network device, including:

The first node sends a random access preamble sequence to the network device according to the period information of the time-frequency resource in the access configuration information. Here, the first node can use a long period (that is, a period longer than the normal period, and the normal period is the access period configured by the network device for the terminal device) for random access. The success probability of random access of the first node is improved.

In a third aspect, a random access method is provided, including: the first node obtains indication information, where the indication information includes: the number of times that the random access preamble sequence is repeatedly sent on the random access resource, and the random access preamble sequence is repeatedly sent by adopting the method of repeatedly sending the random access preamble. The type of the node for the number of sequences; the first node determines the number of times the random access preamble sequence is repeatedly sent on the random access resource according to the type of the node; the first node sends the random access preamble sequence to the network device. In the embodiment of the present application, by reducing the number of repetitions of the preamble in the random access preamble sequence, and filling the length of the sequence corresponding to the reduced part with a guard interval (guard time, GT or GP), it is possible to prevent the preamble sent by the relay node from being mixed with other symbol interference, thereby increasing the probability that the network device successfully detects the preamble.

Optionally, the type of the node includes: a relay node or a terminal device.

Optionally, the method includes: the first node determines that the first node is a relay node. Here, the first node initiates random access by using the number of times of sending the random access preamble sequence corresponding to the relay node.

In a possible implementation manner, the first node obtains the indication information, including:

The first node obtains the indication information through dedicated signaling; or

The first node obtains the indication information through a system broadcast message; or

The first node obtains the indication information through the configuration information.

Therefore, the manner in which the first node obtains the indication information is relatively flexible.

In a fourth aspect, a method for random access is provided, including: a network device sending a first parameter to a first node, where the first parameter includes: a random access preamble sequence sent by the first node is compared with a previous random access preamble sent The time advance offset of the sequence; the network device receives the random access preamble sequence sent by the first node. Therefore, for the long-distance nodes beyond the coverage of the cell, the network device configures the time advance offset for the first node, so that the first node sends the random access preamble sequence to the network device in advance, which helps to improve the success rate of accessing the network. probability.

Optionally, the network device sends a random access response RAR message to the first node, where the RAR message includes the second timing advance; the network device receives a notification message from the first node, and the notification message includes a notification message for the network device to respond to the second time advance. Information to be updated in advance.

Optionally, the notification message includes information on cumulative values of multiple timing advance offsets for sending random access preamble sequences multiple times; or, the notification message includes multiple timing advance offsets for sending random access preamble sequences multiple times. The third timing advance is obtained by adding the accumulated value of the shift amount to the second timing advance.

In a possible implementation manner, the first parameter further includes: the number of times of sending the maximum applied time advance offset for sending the same random access preamble sequence.

A fifth aspect provides a method for random access, comprising: a network device sending access configuration information to a first node, where the access configuration information includes: time-frequency resources of a random access preamble sequence, a node using the time-frequency resources Type; the network device receives the random access preamble sequence sent by the first node. Therefore, for a long-distance node beyond the coverage of the cell, the network device configures the access configuration information for the first node, so that the first node sends the random access preamble sequence to the network device according to the access configuration information, which helps to improve the successful access. probability of entering the network.

Optionally, the node type includes: a relay node or a terminal device.

Optionally, the time-frequency resources include time-domain resources and frequency-domain resources of at least one random access in one or more radio frames; or,

The time-frequency resources include time-domain resources and frequency-domain resources for random access in at least one of one or more radio frames, and the access configuration information also includes period information of the time-frequency resources; or,

The time-frequency resources include multiple random access time-domain resources and frequency-domain resources in one or more radio frames, and the access configuration information further includes: at least one time-frequency resource and period information corresponding to the at least one time-frequency resource.

Optionally, the time-frequency resources of the random access preamble sequence include: resources that support the terminal device to send the random access preamble sequence using the first random access preamble format, where the first random access preamble format is the same as the first random access preamble format used by the terminal device. 2. The coverage range supported by the random access preamble format is different.

A sixth aspect provides a random access method, comprising: a network device sending indication information to a first node, where the indication information includes: the number of times the random access preamble sequence is repeatedly sent on the random access resource, and the random access preamble sequence is repeatedly sent on the random access resource. The type of the node that accesses the preamble sequence number of times; the network device receives the random access preamble sequence sent by the first node. Therefore, for long-distance nodes beyond the coverage of the cell, the network device configures the first node to repeatedly send the random access preamble sequence on the random access resource, so that the first node can send the random access preamble sequence repeatedly according to the number of times. Sending a random access preamble sequence to a network device helps to improve the probability of successfully accessing the network.

Optionally, the type of the node includes: a relay node or a terminal device.

In a possible implementation manner, the network device sends indication information to the first node, including:

The network device sends the indication information to the first node through dedicated signaling; or,

The network device sends the indication information to the first node through a system broadcast message; or,

The network device sends the indication information to the first node through the configuration information.

Therefore, the manner in which the network device sends the indication information to the first node is relatively flexible, which is not specifically limited.

In a seventh aspect, a communication device is provided, the communication device comprising a module for performing the method in the above-mentioned first aspect or any possible implementation manner of the first aspect, or for performing the above-mentioned second aspect or the second aspect A module of a method in any possible implementation manner of the third aspect, or a module for executing the method in the above third aspect or any possible implementation manner of the third aspect.

In an eighth aspect, a communication device is provided, the communication device comprising a module for performing the method in the fourth aspect or any possible implementation manner of the fourth aspect, or for performing the fifth aspect or the fifth aspect A module of a method in any possible implementation manner of , or a module for executing the method in the above sixth aspect or any possible implementation manner of the sixth aspect.

In a ninth aspect, a communication apparatus is provided, and the communication apparatus may be a first node (such as an IAB node or a terminal device) in the above method design, or a chip provided in the first node. The communication device includes: a processor, coupled to a memory, and configured to execute instructions in the memory, so as to implement the first aspect, the second aspect, or the third aspect and any possible implementation manners thereof and executed by the first node Methods. Optionally, the communication device further includes a memory. Optionally, the communication device further includes a communication interface, and the processor is coupled to the communication interface.

When the communication device is the first node, the communication interface may be a transceiver, or an input/output interface.

When the communication device is a chip provided in the first node, the communication interface may be an input/output interface.

Optionally, the transceiver may be a transceiver circuit. Optionally, the input/output interface may be an input/output circuit.

In a tenth aspect, a communication apparatus is provided, and the communication apparatus may be the network device in the above method design, or a chip provided in the network device. The communication apparatus includes: a processor, coupled to a memory, and configured to execute instructions in the memory, so as to implement the method executed by the network device in the fourth aspect, the fifth aspect or the sixth aspect and any possible implementation manners thereof . Optionally, the communication device further includes a memory. Optionally, the communication device further includes a communication interface, and the processor is coupled to the communication interface.

When the communication device is a network device, the communication interface may be a transceiver, or an input/output interface.

When the communication device is a chip provided in the network device, the communication interface may be an input/output interface.

Optionally, the transceiver may be a transceiver circuit. Optionally, the input/output interface may be an input/output circuit.

In an eleventh aspect, a program is provided, which, when executed by a processor, is used to execute any one of the methods in the first to sixth aspects and possible implementations thereof.

A twelfth aspect provides a program product, the program product comprising: program code, when the program code is processed by a communication unit, processing unit or transceiver, processing unit, or transceiver of a communication apparatus (eg, a network device or a first node). When the controller runs, the communication device is caused to perform any one of the methods in the first aspect to the sixth aspect and possible implementations thereof.

In a thirteenth aspect, a computer-readable storage medium is provided, the computer-readable storage medium stores a program, and the program causes a communication apparatus (eg, a network device or a first node) to execute the above-mentioned first to sixth aspects A method of any of the aspects and possible embodiments thereof.

Description of drawings

FIG. 1 is a system architecture diagram to which an embodiment of the present application is applied.

FIG. 2 is a schematic flowchart of a random access method according to an embodiment of the present application.

FIG. 3 is a schematic diagram of an example according to an embodiment of the present application.

FIG. 4 is a schematic flowchart of a random access method according to another embodiment of the present application.

FIG. 5 is a schematic diagram of an example according to an embodiment of the present application.

FIG. 6 is a schematic diagram of another example according to an embodiment of the present application.

FIG. 7 is a schematic diagram of still another example according to an embodiment of the present application.

FIG. 8 is a schematic diagram of an example according to another embodiment of the present application.

FIG. 9 is a schematic block diagram of an apparatus for random access according to an embodiment of the present application.

FIG. 10 is a schematic structural diagram of an apparatus for random access according to an embodiment of the present application.

FIG. 11 is a schematic block diagram of an apparatus for random access according to another embodiment of the present application.

FIG. 12 is a schematic structural diagram of an apparatus for random access according to another embodiment of the present application.

Detailed ways

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

The technical solutions of the embodiments of the present application can be applied to various communication systems, for example, a global system for mobile communications (GSM) system, a code division multiple access (CDMA) system, a wideband code division multiple access (wideband) system code division multiple access (WCDMA) system, general packet radio service (GPRS), long term evolution (long termevolution, LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (time division duplex, TDD), universal mobile telecommunication system (UMTS), worldwide interoperability for microwave access (WiMAX) communication system, future fifth generation (5th generation, 5G) mobile communication system Or new radio (new radio, NR) and so on.

The terminal device in this embodiment of the present application may refer to a user equipment, an access terminal, a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent or user device. The terminal device may also be a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a wireless communication function handheld devices, computing devices or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, terminal devices in future 5G networks or terminals in future evolved public land mobile networks (PLMN) equipment, etc., which are not limited in this embodiment of the present application.

The network device in this embodiment of the present application may be a device for communicating with a terminal device, and the network device may be a global system for mobile communications (GSM) system or code division multiple access (CDMA) The base transceiver station (BTS) in the LTE system can also be the base station (NodeB, NB) in the wideband code division multiple access (WCDMA) system, or the evolved base station (evolved) in the LTE system. NodeB, eNB or eNodeB), it can also be a wireless controller in the cloud radio access network (cloud radio access network, CRAN) scenario, or the network device can be a relay station, an access point, an in-vehicle device, a wearable device, and future The network equipment in the 5G network or the network equipment in the future evolved PLMN network, etc., are not limited in the embodiments of the present application.

In this embodiment of the present application, the terminal device or the network device includes a hardware layer, an operating system layer running on the hardware layer, and an application layer running on the operating system layer. The hardware layer includes hardware such as a central processing unit (CPU), a memory management unit (MMU), and memory (also called main memory). The operating system may be any one or more computer operating systems that implement business processing through processes, such as a Linux operating system, a Unix operating system, an Android operating system, an iOS operating system, or a Windows operating system. The application layer includes applications such as browsers, address books, word processing software, and instant messaging software. In addition, the embodiments of the present application do not specifically limit the specific structure of the execution body of the methods provided by the embodiments of the present application, as long as the program that records the codes of the methods provided by the embodiments of the present application can be executed to provide the methods provided by the embodiments of the present application. For example, the execution subject of the method provided by the embodiment of the present application may be a terminal device or a network device, or a functional module in the terminal device or network device that can call and execute a program.

Additionally, various aspects or features of the present application may be implemented as a method, apparatus, or article of manufacture using standard programming and/or engineering techniques. The term "article of manufacture" as used in this application encompasses a computer program accessible from any computer readable device, carrier or medium. For example, computer readable media may include, but are not limited to: magnetic storage devices (eg, hard disks, floppy disks, or magnetic tapes, etc.), optical disks (eg, compact discs (CDs), digital versatile discs (DVDs) etc.), smart cards and flash memory devices (eg, erasable programmable read-only memory (EPROM), cards, stick or key drives, etc.). Additionally, various storage media described herein can represent one or more devices and/or other machine-readable media for storing information. The term "machine-readable medium" may include, but is not limited to, wireless channels and various other media capable of storing, containing, and/or carrying instructions and/or data.

FIG. 1 shows a schematic diagram of an application scenario of an embodiment of the present application. The communication system shown in FIG. 1 includes three types of equipment: network equipment, relay equipment and terminal equipment. Among them, the relay equipment is outside the planned coverage of the network equipment. The distance from the relay device to the network device is greater than the distance from the terminal device to the network device. The link between the network device and the relay device may be referred to as a "backhaul (BH) link", and the link between the relay device and the terminal device may be referred to as an "access (AC) link" ".

The relay device may be deployed further away from the base station or the access device than at the terminal device, where the access device may be another relay node. If the relay device initiates random access using the same random access resource configuration as that of the terminal device, out-of-cell coverage access will occur, which will cause the relay device to fail to access and cause interference to the terminal devices within the coverage area of the network device. .

It should be understood that this application does not limit the name of the link between the network device and the relay device, the name of the link between the relay device and the network device, and the name of the link between the relay device and the terminal device. In addition, in this embodiment of the present application, the network device may also be referred to as a "donor network device" or a "donor network device" or a "donor base station" or a "relay device".

Optionally, the relay device may be a relay node (relaying node, RN), a relay transmission and reception point (relaying transmission and reception point, rTRP), or an integrated access and backhaul node (integrated access and backhaul node, IAB) node).

It should be understood that although FIG. 1 shows that the relay device is directly connected to the network device through the wireless air interface, the IAB relay system can support multi-level relay, that is, one relay device is connected to the host base station through another relay device. . It should not be understood that the relay device only supports the one-hop relay shown in FIG. 1 .

For the convenience of description, the basic terms or concepts used in this application are defined below.

Upper-level node: The node that provides wireless backhaul link resources, network equipment, is called the upper-level node of the relay device,

Subordinate node: The node that uses the backhaul link resources to transmit data to the network, or receive data from the network is called the subordinate node. For example, the relay device is called the subordinate node of the network device, and the network is the core network or other access nodes. The network above the network, such as the Internet, private network, etc.

Access link: The access link refers to the wireless link used by a node to communicate with its subordinate nodes, including uplink and downlink transmission links. The uplink transmission on the access link is also referred to as the uplink transmission of the access link, and the downlink transmission is also referred to as the downlink transmission of the access link. The nodes include but are not limited to the aforementioned IAB nodes.

Backhaul link: The backhaul link refers to the wireless link used by a node to communicate with its superior node, including uplink and downlink transmission links. The uplink transmission on the backhaul link is also referred to as the uplink transmission of the backhaul link, and the downlink transmission is also referred to as the downlink transmission of the backhaul link. The nodes include but are not limited to the aforementioned IAB nodes.

Taking the terminal equipment as a UE as an example, the process of the UE accessing the network specifically includes: (1) message (message, Msg) 1: the UE sends a preamble code to the base station; (2) Msg2: the base station sends a random access code to the UE A random access response (RAR) message; (3) the UE sends a message 3 (Msg3) to the base station according to the RAR message; (4) Msg4: the base station sends a contention resolution message to the UE to notify the UE that the access is successful.

When the UE accesses the mobile communication system or performs data transmission, it needs to obtain a timing advance (Timing Advance, TA). The TA value may represent the distance between the UE and the base station, or the TA value is introduced for uplink synchronization, which is convenient for sending uplink data later. The acquisition process of the TA value is as follows: the UE sends a known sequence to the base station, such as a random access preamble in a non-contention access scenario or a contention access scenario, and the base station calculates the TA value according to the known sequence. , and send the TA value to the UE, where the TA value may be carried in the random access response RAR message sent by the base station to the UE. For example, the UE may receive an RAR message sent by the base station, where the RAR message includes a TA value. Optionally, the RAR message may further include an uplink grant (UL grant), where the uplink grant indicates uplink transmission resources for the UE to send uplink data; cell temporary identity (temporary C-RNTI, TC-RNTI) information , which is used to identify the UE in the cell.

For nodes that are far away from the network equipment (such as long-distance IAB nodes), if the random access resource configuration used by the UE in the existing process is still used to initiate random access, because the distance between the node and the base station is too large, when the random access When the preamble sequence reaches the network device, it has exceeded the detection window of the network device, and out-of-cell coverage access will occur, resulting in failure of IAB node access and interference to UEs within the coverage of the network device. This embodiment of the present application proposes to propose a random access method, so as to increase the probability that a node far from the network device successfully accesses the network.

In order to solve the above problems, the present application provides a random access method, including: a first node sends a random access preamble sequence to a network device; the first node determines that a response message from the network device has not been received; the first node determines The first timing advance for resending the random access preamble sequence, the first timing advance is determined by a first parameter, and the first parameter includes: the random access preamble sequence sent by the first node is compared with the previous random access preamble sequence sent. Timing advance offset; the first node sends a random access preamble sequence to the network device according to the first timing advance. Compared with the normal process of using the terminal device to send the preamble sequence before random access, the embodiment of the present application, for the remote node beyond the coverage of the cell, sends the random access preamble sequence to the network device in advance, which helps to improve the successful access. network probability.

In a possible implementation manner, the first parameter further includes: the number of times of sending the maximum applied time advance offset for sending the same random access preamble sequence;

The first node sends a random access preamble sequence to the network device according to the first timing advance, including:

The first node determines that the number of times of sending the random access preamble sequence is less than or equal to the number of times of sending the maximum applied time advance offset;

The first node adjusts the sending timing, and the adjusted sending timing includes advancing the sending time relative to the previous sending advance time by an offset amount;

The first node sends the random access preamble sequence to the network device according to the adjusted sending timing.

Wherein, "less than or equal to" can be interpreted as "<" or "≤".

The present application also provides a method for random access, including: a first node receives access configuration information from a network device, where the access configuration information includes: time-frequency resources of a random access preamble sequence, a node using the time-frequency resources type; the first node determines to use the access configuration information to perform random access according to the access configuration information; the first node sends a random access preamble sequence to the network device. Therefore, by providing access configuration information for the first node, the success rate of random access is improved.

The present application also provides a method for random access, including: the first node obtains indication information, where the indication information includes: the number of times the random access preamble sequence is repeatedly sent on the random access resource, and the random access preamble sequence is repeatedly sent by using The first node determines the number of times of repeatedly sending the random access preamble sequence on the random access resource according to the type of the node; the first node sends the random access preamble sequence to the network device. In the embodiment of the present application, by reducing the number of repetitions of the preamble in the random access preamble sequence, and filling the length of the sequence corresponding to the reduced part with a guard interval (guard time, GT or GP), it is possible to prevent the preamble sent by the relay node from being mixed with other symbol interference, thereby increasing the probability that the network device successfully detects the preamble.

FIG. 2 shows a schematic flowchart of a random access method 200 according to an embodiment of the present application. As shown in FIG. 2, the method 200 includes:

S210, the first node sends a random access preamble sequence to the network device.

The first node can be understood as a node that is far away from the network device. The first node sends the random access preamble sequence to the network device, which may not be detected by the network device. The network device may be a donor base station or an upper-level relay node. When the first node is far away from the network device, due to air interface transmission delay, the random access preamble sent by the first node may have exceeded the detection range of the network device, so that the preamble cannot be detected correctly. It should be understood that the random access preamble here may be the random access preamble initially sent by the first node, or the first node may adjust the uplink transmission timing after the transmission fails (optionally, the transmission timing can be understood as the transmission timing) The random access preamble sequence sent later is not limited in this application.

Optionally, the first node may be an IAB node. It should be understood that the first node in this embodiment of the present application may not be limited to an IAB node, and is applicable to other nodes or devices that have access requirements that cannot successfully perform random access because they are far away from the network device. The random access method of the embodiment is not limited thereto.

S220, the first node determines that no response message is received from the network device. The response message is a random access response RAR message.

After the first node sends the random access preamble sequence to the network device, and after waiting for a certain time window, the first node determines that it has not received the response message sent by the network device, then the first node may consider that the network device has not detected it or that it is incorrect If the random access preamble sequence sent by the first node is detected, the first node needs to re-send the random access preamble sequence. Usually, waiting for a certain time window is defined by the protocol, and different time windows can be defined for different nodes. If different time windows are defined for different nodes, the access nodes need to be notified through broadcast messages, such as system messages. For example, the time window for the relay node is different from the time window for the terminal device, or it may be configured as a different time window by default through a protocol, which is not limited in this application. If it is notified to the access node through a system message, the device type to which the time window belongs needs to be indicated in the system message.

S230, the first node determines a first timing advance for re-sending the random access preamble sequence, the first timing advance is determined by a first parameter, and the first parameter includes: the random access preamble sequence sent by the first node is compared with the previous transmission The timing advance offset of the random access preamble sequence.

In the embodiment of the present application, before the first node resends the random access preamble sequence, it needs to determine the first timing advance for the subsequent transmission of the random access preamble sequence. Since the random access preamble sequence that the first node tries to send in step S210 may not be detected by the network device, the first node needs to adjust the first timing advance and re-send the random access preamble sequence to the network device. The first timing advance is determined according to the first parameter.

Optionally, the first parameter may include: a time advance offset of the random access preamble sequence sent by the first node compared to the previous time the random access preamble sequence was sent.

It should be understood that the first timing advance is different from the traditional timing advance. The first timing advance is a process in which the first node re-determines the sending timing by itself after the first node does not receive the RAR from the network. If the first node sends the random access preamble for the first time, as described above, the first timing advance will not be used to send the random access preamble in advance. In the case of not receiving the RAR, the first node can send the random access preamble in advance by adjusting the uplink sending timing, which can avoid the random access preamble sent by the first node due to the distance between the first node and the network device being too far. The random access failure caused by the incoming preamble cannot be received by the network device. Adjusting the sending timing means that the first node sends the random access preamble in advance of the time advance by the offset amount on the basis of the last sending timing.

The first timing advance may be a timing advance offset relative to the last advance sending, and in this case, the first timing advance and the timing advance offset are the same. The first timing advance may also be the sum of the accumulated timing advance offsets obtained by sending the same random access preamble multiple times. In this case, when the first timing advance is used for timing, it is relative to the random access Timing offset of the access preamble. This application does not limit which solution is adopted.

The time advance offset can be understood as the time step. The first node may use the time advance offset to send the random access preamble sequence to the network device in advance. For example, if the first node sends the random access preamble sequence to the network device for the first time, and determines that it has not received the response message from the network device, then the first node sends the random access preamble sequence to the network device for the second time. The time of one transmission is sent in advance by a certain period of time (that is, the time advance offset); if the first node determines that it still does not receive a response message from the network device after sending the random access preamble sequence to the network device for the second time, then the first node When the node sends the random access preamble sequence to the network device for the third time, it will send it a certain period of time (that is, the time advance offset) ahead of the second sending time, and so on, step-by-step cumulative time advance offset. until the first node receives a response message from the network device.

Alternatively, the timing advance offset may be characterized by time units. For example, the time unit can be a symbol, a time slot, a mini-slot (mini-slot), a millisecond (ms), or an integer multiple of the basic time unit T _c =1/(Δf _max ·N _f ) defined in the protocol, Where Δf _max =480·10 ³ Hz, N _f =4096 and other time units, the present application does not impose constraints on the value or time unit of the time advance offset, and may be other time units.

Optionally, the first parameter may further include: the number of times of sending the maximum applied time advance offset for sending the same random access preamble sequence. The first node may send the random access preamble sequence to the network device by using the time advance offset and the number of times of sending the maximum applied time advance offset. Here, the first node uses the time advance offset to send the random access preamble sequence to the network device with a number of times less than or equal to the number of times of sending the maximum applied time advance offset. For example, if the first node successfully receives the response message from the network device after sending the random access preamble sequence once by using the time advance offset, the first node does not need to send the random access preamble sequence again. That is to say, the number of times of sending the random access preamble sequence by the first node using the time advance offset may not exceed the number of times of sending the maximum applied time advance offset.

Optionally, the first parameter may be carried in a system message broadcast by the network device. Specifically, for example, the first parameter is sent by the donor base station to the IAB node. Or, optionally, the first parameter may also be predefined by the protocol.

S240, the first node sends a random access preamble sequence to the network device according to the first timing advance.

Specifically, the timing at which the first node sends the random access preamble sequence using the first parameter is earlier than the timing at which the random access preamble sequence was sent last time. If the first node does not receive the response message from the network device, the above steps S210-S230 need to be repeated, that is, the timing of each random access preamble sent must be ahead of the previous sending timing by an offset. In this way, the first node sends the random access preamble sequence in advance through the step-by-step accumulation, so that the random access preamble sequence of the first node can fall within the detection window of the network device after long-distance transmission, which helps to improve the first node. The success rate of nodes accessing the network.

The method for determining the first timing advance and its specific representation are as described above, and will not be repeated here.

Taking the timing of sending the Msg1 by the terminal device and the IAB node in FIG. 3 as an example, as shown in FIG. 3 , the terminal device may periodically send the Msg1 (including the preamble) to the donor base station. Assume that the timing of sending Msg1 by the IAB node for the first time is the same as the sending timing of the terminal device. If the IAB node does not receive the RAR message from the network device after sending Msg1 for the first time, the IAB node sends Msg1 for the second time. Offset ahead of time ahead of when Msg1 is first sent. Similarly, if the IAB node still does not receive the RAR message from the network device after sending Msg1 for the second time, when the IAB node sends Msg1 for the third time, it will move ahead of time compared to the timing of sending Msg1 for the second time. quantity. As can be seen from Figure 3, the IAB node uses the time advance offset as the step size, and the step-by-step accumulation randomly accesses the preamble sequence to the network device, and the terminal device does not automatically adjust the sending timing.

Optionally, the method 200 further includes:

The network device sends a random access response RAR message to the first node. Correspondingly, the first node receives the RAR message from the network device.

The RAR message includes a second timing advance, and the first node sends a notification message to the network device according to the timing advance offset and the second timing advance of the first parameter, and the notification message includes a notification message for the network device to advance the second timing amount of updated information. Correspondingly, the network device receives the notification message from the first node.

The network device sends a contention resolution message to the first node. Correspondingly, the first node receives the contention resolution message from the network device.

Specifically, after successfully receiving the random access preamble sequence of the first node, the network device will send a random access response RAR message to the first node, where the RAR message includes a second timing advance, and the second timing advance The amount is similar to that in the existing process, and is used for the uplink synchronization between the first node and the network device. Correspondingly, after receiving the RAR message, the first node may send a notification message to the network device, and the notification message may include information for the network device to update the second timing advance. Also, the network device may send a contention resolution message to the first node, where the contention resolution message is used to notify the first node of successful access.

The second timing advance in the RAR message is based on the estimation result of the network device detecting the random access preamble sequence sent by the first node, and the timing estimation method thereof is the same as the traditional timing estimation method. However, the network device does not know how long the first node has sent the random access preamble in advance. In order to obtain correct uplink reception or downlink transmission timing adjustment, the network device needs to obtain correct timing advance information. Therefore, the first node needs to send the information of the accumulated value of the time advance offset sent in advance to the network device, or directly combine the accumulated value of multiple time advance offsets of multiple random access preamble sequences with the second time The third timing advance obtained by adding the advance is sent to the network device.

Optionally, the notification message sent by the first node to the network device includes information on cumulative values of multiple timing advance offsets for sending multiple random access preamble sequences. Specifically, although the network device configures the time or step size that needs to be advanced each time for the first node, the network device does not know the cumulative value of the time advance offset after the first node sends the random access preamble sequence multiple times (the cumulative value of the time advance offset). value is used to count the accumulated time advance offset). Therefore, the first node can notify the network device of the accumulated value of the time advance offset, so that the network device can calculate the actual time advance according to the accumulated value sent by the first node, and update the second time advance based on the calculated actual time advance. Amount of time advance for ease of subsequent use.

Or, the notification message includes a third timing advance obtained by adding a cumulative value of multiple timing advance offsets for sending multiple random access preamble sequences to the second timing advance. Specifically, the first node may feed back the calculated actual timing advance (ie, the third timing advance) to the network device, so that the network device directly updates based on the actual timing advance fed back by the first node.

Optionally, the first node may also acquire indication information for indicating a power ramping manner. Specifically, when the first node uses the first parameter to send the random access preamble sequence, the factor of power ramping may also be considered. The concepts involved in the power ramping mechanism can be found in the existing protocols (for details, please refer to the standard protocol 3GPP TS38.321 V15.2.0 and 3GPP TS 38.331 V15.2.1), here is a brief introduction: For the same random access preamble sequence, The first node re-sends the random access preamble sequence for the second time, and needs to compensate for extra power each time. The extra power that needs to be supplemented can be calculated by the following formula:

(PREAMBLE_POWER_RAMPING_COUNTER–1)×PREAMBLE_POWER_RAMPING_STEP,

Among them, the initial value of PREAMBLE_POWER_RAMPING_COUNTER is 1, and each time a power ramp is done counter+1, here PREAMBLE_POWER_RAMPING_COUNTER is called counter; among them, PREAMBLE_POWER_RAMPING_STEP is configured by the network device through broadcast system messages. It should be understood that the specific explanation of the above formula can refer to the description in the standard protocol 3GPP TS 38.321 5.1.1, which is not repeated for brevity.

For example, after the first node uses the time advance offset to advance the transmission time once, it first uses the same random access preamble sequence to perform power ramping, and when the same random access preamble sequence reaches the maximum number of times of sending the time advance offset After that, advance the transmission time again and start the power ramping from the beginning.

For another example, after using the time advance offset to advance the sending time once, the first node first uses the same random access preamble sequence to perform power ramping, and after the same random access preamble sequence reaches the maximum number of times of sending the time advance offset applied , and advance the transmission time again, instead of starting the power ramp from the beginning, it continues to ramp up based on the previous transmit power, and does not continue the power ramp up until the maximum power is reached.

For another example, after the first node performs a power ramp-up, it starts to send the random access preamble sequence according to the time advance offset. After the same random access preamble sequence reaches the maximum number of times of sending the time advance offset, the power ramps up again. , and then maintain the power after the ramp-up and start sending the random access preamble sequence from the beginning using the time advance offset.

The above describes the manner in which the first node sends the random access preamble sequence in advance through step-by-step accumulation, so as to increase the success rate of random access. The present application also provides another embodiment, which improves the success rate of random access by providing access configuration information for the first node. It will be described in detail below.

FIG. 4 shows a schematic flowchart of a method 400 according to another embodiment of the present application. As shown in FIG. 4, the method 400 includes:

S410: The network device sends access configuration information to the first node, where the access configuration information includes time-frequency resources of a random access preamble sequence and a node type that uses the time-frequency resources. Correspondingly, the first node receives access configuration information from the network device.

Optionally, the node type includes: a relay node or a terminal device.

The time-frequency resources include at least one random access time-domain resource and frequency-domain resource in one or more radio frames; or,

The time-frequency resources include time-domain resources and frequency-domain resources for random access in at least one of one or more radio frames, and the access configuration information also includes period information of the time-frequency resources; or,

The time-frequency resources include multiple random access time-domain resources and frequency-domain resources in one or more radio frames, and the access configuration information further includes: at least one time-frequency resource and period information corresponding to the at least one time-frequency resource.

In a possible implementation, the network device configures an independent random access resource (for example, a physical random access channel (PRACH)) for the relay node. Specifically, the time-frequency resources in the access configuration information can be configured for each radio frame, or for odd-numbered radio frames, or for even-numbered radio frames to include random access resources of relay nodes. The specific configuration method is similar to the traditional random access resources. The configuration method of the access resources, but also includes the node types that can be used by the configured random access resources. In this configuration, the configuration itself includes periodic information, that is, each radio frame, or the radio frame with an odd radio frame number, or a radio frame with an even radio frame number is configured with time-frequency resources for random access, where time-frequency The resources include time domain resources and frequency domain resources of the random access resources in the radio frame. Optionally, the random access resources meet one or more of the following conditions: the random access resources and the access resources used by the terminal equipment are time-divisional in the time domain; the random access resources and the access resources used by the terminal equipment are time-divisional; The resources are frequency-divided in the frequency domain; the random access resources and the access resources used by the terminal equipment are code-divided in the code domain. Optionally, the random access resource configured by the network device for the relay node may also include one or more of the following information: frequency domain location of the random access resource, period and subframe offset of the random access resource. , the format information of the preamble sequence of the random access resource, the power information used for sending the preamble sequence, the Ncs configuration index, the cell speed indication, the contention resolution duration and other random access configuration information (not listed here, for details, please refer to the existing related configuration information in the technology). That is to say, in this implementation manner, the network device additionally configures a set of random access resource configuration for the relay node, and the configuration is dedicated for the relay node to initiate random access, so as to improve the probability of the relay node's successful access. It should be noted that, for the case where the random access resource is specially configured for the relay node, the random access resource can be directly corresponding to the node type, for example, the random access resource corresponding to the relay node and the random access resource corresponding to the terminal device. resource. It should be understood that the relay node here is a specific example of the first node in the foregoing method 200, and does not constitute a limitation to the embodiment of the present application.

Optionally, the access configuration information may further include period information of the time-frequency resources, so that the relay node can determine the resources that the relay node can use for random access in combination with the time-frequency resources. Since the number of relay nodes is relatively small, once the random access is completed, it is relatively stable, and frequent random access will not occur. Therefore, the time of random access can be sacrificed to save resource overhead. A possible configuration method is that the time-frequency resource in the access configuration information specifies the starting radio frame number, frequency domain resource information, period information of the time-frequency resource, and may also include the subframe number or time slot number of the time-frequency resource. . Through the period information of the time-frequency resources, the period of the random access resources of the relay node can be lengthened, thereby reducing resource consumption.

In a possible implementation, the random access resource of the relay node is a part of the random access resource of the terminal device. Specifically, one or more time-frequency resources can be selected from the random access resources of the terminal device for random access of the relay node. Similarly, it can be each radio frame, or the radio frame number is odd, or the radio The radio frame with an even frame number contains the random access resources of the relay node; or it is specified to select one or more time-frequency resources from the random access resources of the terminal equipment, specify the starting radio frame number and the period corresponding to the adaptation resources information, and select random access resources of one or more terminal devices at regular intervals for random access resources of the relay node. It should be understood that the node type of the random access resource also needs to be specified at this time. Considering the compatibility of the terminal equipment, the terminal equipment needs to identify that there may be relay nodes on some resources to transmit the random access preamble sequence. Avoid selecting random access resources that may conflict with the relay node to initiate the transmission of random access preamble sequences. That is to say, if one or more resources are extracted from all random access resources and configured for the relay node to use, all random access resources are configured for the terminal equipment to use. At this time, the terminal equipment can choose not to use specific resources. (that is, the resources allocated to the relay node) for transmission, which depends on the definition of the protocol, which is not limited. In some cases, these conflicting resources may not be avoided, depending on the protocol definition and specific solution design, which is not restricted in this application.

It should be understood that the above node types may not be explicitly configured, especially when the relay node uses part of the resources of the terminal device to perform random access, a conflicting resource may be configured, and the conflicting resource is used for the relay node to perform random access. Therefore, the node type can also be determined by the conflicting resource indication, which depends on the protocol definition. For example, it is stipulated that if the conflicting resource option is configured, it means that the conflicting resource is configured for the relay node. The specific definition method is not limited in this application.

S420, the first node determines to use the access configuration information to perform random access according to the access configuration information.

Optionally, S420 includes: the first node determines, according to the node type, that the first node uses the access configuration information to perform random access.

Optionally, the first node determining, according to the node type, that the first node uses the access configuration information to perform random access, including: the first node determining that the node type is a relay node. Specifically, if the first node determines that the node type of the first node is a relay node, the first node performs random access by using the access configuration information of the relay node.

Before the first node selects the random access resource, it first selects the random access resource according to the node type corresponding to the time-frequency resource in the foregoing random access configuration information. Since the random access resources of the relay node and the terminal device are different, the first node only performs random access on the resources available to the relay node. Using the access configuration information to perform random access includes: selecting a time-frequency resource in the access configuration information according to the node type, and sending a random access preamble sequence on the selected time-frequency resource. The determination of the time-frequency resource may also depend on the period information of the time-frequency resource, which is described above and will not be repeated.

In a possible implementation, if a terminal device performs random access, only random access resources that can be used by the terminal device are selected to perform random access. If the random access resource of the relay node is a part of the random access resource of the terminal device, the time-frequency resource information of the conflicting resource needs to be additionally configured in the random access resource configuration of the terminal device. That is, if a conflicting resource is configured, the conflicting resource is considered to be configured for the relay node.

S430, the first node sends a random access preamble sequence to the network device.

Specifically, after receiving the access configuration information of the network device, the first node determines whether the node type is a relay node or a terminal device according to the node type in the access configuration information. The first node determines that the node type is a relay node (that is, the first node is a relay node), uses the time-frequency resource configured by the network device for sending the random access preamble sequence to perform random access, and sends the random access preamble to the network device. sequence.

In the embodiment of the present application, for the case where the node type is a terminal device, there may be the following two implementation manners, which are described in detail below.

Optionally, as a first implementation manner, the first node determines that the node type of the first node is a terminal device, then the first node determines not to perform random access on conflicting resources or random access resources that cannot be used by mid-end devices. enter. The conflicting resource means that the relay node performs random access by using part of the random access resource of the terminal device, which is described above and will not be repeated here. If the random access resources of the terminal device and the random access resources of the relay node are independently configured, the terminal device does not use the random access resources of the relay node to perform random access. In the first implementation manner, the terminal device uses the normal random access preamble format, and can wait for the next general random access resource (the general random access resource is the connection that the network device normally configures for the terminal device). access resources) for random access.

Optionally, as a second implementation manner, the first node determines that the node type of the first node is a terminal device, and then the first node determines to use the first random access preamble format to perform random access. The time-frequency resources of the random access preamble sequence include: resources that support the terminal device to send the random access preamble sequence using the first random access preamble format, wherein the first random access preamble format and the second random access preamble format used by the terminal device are used. The coverage ranges supported by the access preamble formats are different, and the coverage range of the first random access preamble format is wider than that of the second random access preamble format. In other words, the first random access preamble format can support long-distance coverage access. In the second implementation manner, the relay node may also use the first random access preamble format to perform random access. In this implementation manner, the random access resource used by the relay node may be part of the random access resource used by the terminal device, or the terminal device may also use the random access resource configured for the relay node. In this way, the use efficiency of random access resources can be improved.

Taking the example in FIG. 5 as an example, the period of the random access resource configured by the network device for the UE (that is, the normal resource shown in FIG. 5 , that is, the resource used for normal Msg1 transmission) is 20ms. The random access resource used by the IAB node may be part of the random access resource used by the UE (ie, the special resource shown in FIG. 5 , that is, the resource used for special Msg1 transmission). The UE may use the long-format random access preamble to use the special resource, or the UE may ignore the special resource and wait for the next random access resource before performing random access.

In the embodiment of the present application, the network device may not only configure the time-frequency resource of the random access preamble sequence for the first node, but also configure the period information of the time-frequency resource for the first node. The first node may use the period information of the time-frequency resource to initiate access to the network device. The configuration of the specific period information of the time-frequency resource is as described above, and will not be repeated here. Optionally, as an implementation manner, S430 includes:

The first node sends a random access preamble sequence to the network device according to the period information of the time-frequency resource.

The period information of the time-frequency resource may be a periodical resource of random access configured by the network device for the first node. The first node can determine random access resources according to the period information, and when the random access preamble fails to be sent, it can periodically send the random access preamble sequence to the network device, and periodically send the random access preamble to the network device. The sequence is determined according to the period information of the video resource.

Optionally, for the relay node, the period information of the time-frequency resource configured by the network device may be a relatively long period, for example, may be longer than the period of the time-frequency resource of the terminal device. Correspondingly, after detecting the random access preamble sequence sent by the terminal device, the network device can extend the detection window to continue the detection, so as to detect whether the relay node sends the random access preamble sequence, which can increase the successful access of the relay node. network probability.

Taking the example in FIG. 6 as an example, the period of the random access resource configured by the network device for the UE is 20 ms (corresponding to the normal Msg1 receiving window shown in FIG. 6 ). The period of the random access resource used by the IAB node may be a long period of 120ms (corresponding to the receiving window of the special Msg1 shown in FIG. 6 ). For the network device, after detecting the random access preamble sequence of the UE in the normal window, the receiving window for detecting the normal Msg1 can be extended, and the detection can be continued in the special receiving window, so as to improve the access success rate of the IAB node.

If the IAB node uses the special Msg1 receiving window in Figure 6 to perform random access, the example in Figure 7 is used to describe the corresponding processing of the network device. As shown in Figure 7, the network device detects that the UE sends a message in the original receiving window. After the random access preamble sequence is obtained, the detection window can be extended, and the detection can be continued in the extended detection window. If the random access preamble sequence sent by the IAB node falls within the extended detection window, the network device can detect in the extended detection window, which improves the success rate of random access by the IAB node.

The present application also provides another embodiment, by configuring the number of times of the corresponding random access preamble sequence for the first node to improve the probability of the first node successfully accessing. It will be described in detail below.

This embodiment includes the following steps:

The first node obtains indication information, the indication information includes: the number of times the random access preamble sequence is repeatedly sent on the random access resource, and the type of the node that repeats the number of times the random access preamble sequence is sent;

The first node determines, according to the type of the node, the number of times that the random access preamble sequence is repeatedly sent on the random access resource;

The first node sends a random access preamble sequence to the network device.

Optionally, the type of the node includes a relay node or a terminal device.

Here, the type of the node may be explicitly carried in the signaling, or may be determined according to the attribute of the relay node itself, which is not limited.

Specifically, if the first node determines that the node type is a terminal device (that is, the first node is a terminal device), the first node performs random access using the normal repetition times configured by the network device for the terminal device.

Or, if the first node determines that the node type is a relay node (that is, the first node is a relay node), then the first node uses the number of times the random access preamble sequence corresponding to the relay node is repeatedly sent to be sent on the random access resource. Random access preamble sequence. Specifically, the format of the random access preamble sequence is divided into three parts, which are: cyclic prefix CP, preamble and GP. The number of repeated transmissions corresponding to the relay node can be achieved in the following ways: by reducing the number of repetitions of the preamble in the random access preamble sequence, and filling the reduced part of the corresponding sequence length with a guard interval (guard time, GT or GP), so that Interference between the preamble sent by the relay node and other symbols can be avoided, thereby increasing the probability that the network device successfully detects the preamble.

The above-mentioned obtaining indication information may be obtained from the network by means of signaling, for example, obtained through a broadcast message of the network, such as a system message, or defined by a protocol. If it is defined by a protocol, the first node can be obtained through local configuration, specifically, can be obtained through a local configuration table. For different node types, the number of times of repeating the random access preamble sequence when sending the random access preamble sequence on a random access resource is different, so as to avoid the relay node from being too far away from causing the subsequent time slots or subframes of the random access resource. cause interference.

It should be noted that, in this embodiment of the present application, the number of repetitions of the preamble specifically refers to the number of repetitions of the root sequence in _Nu in the preamble sequence after the preamble format and the subcarrier interval are determined. Table 1 is taken as an example below to describe the meaning of the number of repetitions. It should be understood that for the terms or concepts involved in Table 1, reference may be made to the descriptions in the prior art, which are not repeated here for brevity. As shown in Table 1 below:

Table 1

Taking the B4 format in Table 1 as an example, the number of repetitions of the preamble corresponding to the B4 format refers to 12 in 12·2048κ·2- ^μ . In the embodiment of this application, if the relay node determines to use the B4 format, it needs to The number of repetitions is reduced by 12, and the reduced sequence length is padded with GP.

It should be understood that the above number of repetitions is related to the format of the random access preamble, therefore, the node type targeted by the number of repetitions is also related to the format of the random access preamble.

The following description is combined with the example in FIG. 8 . The terminal device is UE, the first node is IAB, and the network device is a base station as an example for description. As shown in Figure 8, the UE and the IAB node respectively send Msg1 to the base station, where Msg1 consists of a CP, a preamble sequence ( sequence) and GP. The base station detects that the Msg1 sent by the UE and the Msg1 sent by the IAB node will have a transmission delay. It can be seen from FIG. 8 that the base station detects the Msg1 sent by the UE in the detection window. Taking the sequence in the Msg1 sent by the IAB repeated 3 times (repeated 3 times means: the sequence is sent 3 times) as an example, the partial sequence of the Msg1 sent by the IAB falls outside the detection window of the base station, which will cause the IAB to send the sequence. The sequence of Msg1 interferes with other symbol bits of the base station, so that the base station cannot correctly detect the Msg1 sent by the IAB. Here, the number of repetitions of the sequence in Msg1 sent by the IAB is reduced from 3 to one, and the reduced part is filled with GP, so that the sequence outside the detection window becomes GP, thereby avoiding the sequence exceeding the detection window of the base station and being related to The interference of other symbol bits of the base station enables the base station to correctly detect the Msg1 sent by the IAB according to the sequence in the window.

This embodiment of the present application does not limit the manner of acquiring the indication information. Optionally, the obtaining of the indication information by the first node may include: the first node obtains the indication information through dedicated signaling; or, the first node obtains the indication information through a system broadcast message; or, the first node obtains the indication information through configuration information.

That is, the indication information may be sent by the network device to the first node through dedicated signaling (such as RRC signaling, DCI signaling, etc.), or may be broadcast by the network device to each node through system messages.

Alternatively, the first indication information may be predefined by a protocol, and during specific implementation, the first node may locally save a configuration table, where the configuration table includes the agreed number of times of repeatedly sending the random access preamble sequence and the corresponding node type.

It should be understood that the examples in FIG. 5 to FIG. 8 are only for the convenience of those skilled in the art to understand the embodiments of the present application, and are not intended to limit the embodiments of the present application to the exemplified specific scenarios. Those skilled in the art can obviously make various equivalent modifications or changes according to the examples in FIGS. 5 to 8 , and such modifications or changes also fall within the scope of the embodiments of the present application.

It should also be understood that various solutions in the embodiments of the present application may be used in a reasonable combination, and the explanations or descriptions of various terms appearing in the embodiments may be referred to or explained in each embodiment, which is not limited.

It should also be understood that, in various embodiments of the present application, the size of the sequence numbers of the above-mentioned processes does not mean the sequence of execution, and the execution sequence of each process should be determined by its functions and internal logic, and should not be implemented in the present application. The implementation of the examples constitutes no limitation.

The random access method according to the embodiment of the present application is described in detail above with reference to FIG. 1 to FIG. 8 . The apparatus for random access according to an embodiment of the present application will be described below with reference to FIG. 9 and FIG. 12 . It should be understood that the technical features described in the method embodiments are also applicable to the following device embodiments.

FIG. 9 shows a schematic block diagram of an apparatus 900 for random access according to an embodiment of the present application. The apparatus 900 is configured to execute the method executed by the first node in the foregoing method embodiments. Optionally, the specific form of the apparatus 900 may be a relay node or a chip in a relay node, or may be a terminal device or a chip in the terminal device. This embodiment of the present application does not limit this. The apparatus 900 includes:

a transceiver module 910, configured to send a random access preamble sequence to a network device;

a processing module 920, configured to determine that a response message from the network device is not received;

The processing module 920 is further configured to determine a first timing advance for retransmitting the random access preamble sequence, where the first timing advance is determined by a first parameter, where the first parameter includes: the device sends The time advance offset of the random access preamble sequence compared to the previous time when the random access preamble sequence was sent;

The transceiver module 910 is further configured to send a random access preamble sequence to the network device according to the first timing advance.

Optionally, the transceiver module 910 is further configured to:

receiving a random access response RAR message from the network device, where the RAR message includes a second timing advance;

According to the timing advance offset and the second timing advance, a notification message is sent to the network device, where the notification message includes information for the network device to update the second timing advance.

In an optional implementation manner, the notification message includes information on cumulative values of multiple timing advance offsets for sending random access preamble sequences multiple times; or, the notification message includes sending random access preamble sequences multiple times. A third timing advance obtained by adding the cumulative value of multiple timing advance offsets of the access preamble sequence to the second timing advance.

In an optional implementation manner, the first parameter further includes: the maximum number of times of sending the same random access preamble sequence using the time advance offset;

Wherein, the processing module 920 is used for:

determining that the number of times of sending the random access preamble sequence is less than or equal to the number of times of sending the maximum time advance offset;

Adjusting the sending timing, where the adjusted sending timing includes advancing the sending time relative to the previous sending by the time advance offset;

The transceiver module 910 is configured to send a random access preamble sequence to the network device according to the adjusted sending timing.

In an optional implementation manner, the transceiver module 910 is further configured to: receive the first parameter from a second node, where the second node is an upper-level node of the apparatus.

The foregoing apparatus 900 may also execute another embodiment of the present application, which is specifically as follows:

The transceiver module 910 is configured to receive access configuration information from a network device, where the access configuration information includes: a time-frequency resource of a random access preamble sequence, and a node type that uses the time-frequency resource;

A processing module 920, configured to determine, according to the access configuration information, to use the access configuration information to perform random access;

The transceiver module 910 is further configured to: send a random access preamble sequence to the network device.

Optionally, the node type includes: a relay node or a terminal device.

In an optional implementation manner, the time-frequency resources include time-domain resources and frequency-domain resources of at least one random access in one or more radio frames; or,

The time-frequency resources include time-domain resources and frequency-domain resources of at least one random access in one or more radio frames, and the access configuration information further includes period information of the time-frequency resources; or,

The time-frequency resources include multiple random access time-domain resources and frequency-domain resources in one or more radio frames, and the access configuration information further includes: at least one of the time-frequency resources and the at least one time-frequency resource. Period information corresponding to the frequency resource.

In an optional implementation manner, the processing module 920 is configured to determine, according to the access configuration information, to use the access configuration information to perform random access, specifically including:

The apparatus determines, according to the node type, that the apparatus uses the time-frequency resource for random access.

Optionally, the processing module 920 is configured to determine, according to the node type, that the device uses the access configuration information to perform random access, specifically comprising: the device determining that the node type is a relay node, and correspondingly , the device performs random access using the time-frequency resource corresponding to the relay node.

In an optional implementation manner, the processing module 920 is further configured to:

determine that the node type is a terminal device;

It is determined that random access is not performed on the time-frequency resources configured in the access configuration information.

In an optional implementation manner, the time-frequency resources of the random access preamble sequence include: resources that support the terminal device to send the random access preamble sequence using a first random access preamble format, wherein the first random access preamble sequence The access preamble format is different from the coverage supported by the second random access preamble format used by the terminal device.

In an optional implementation manner, the transceiver module 910 is further configured to:

According to the period information of the time-frequency resource in the access configuration information, a random access preamble sequence is sent to the network device.

The foregoing apparatus 900 may also execute another embodiment of the present application, which is specifically as follows:

A processing module 920, configured to acquire indication information, where the indication information includes: the number of times the random access preamble sequence is repeatedly sent on the random access resource, and the type of the node that uses the number of times the random access preamble sequence is repeatedly sent;

The processing module 920 is further configured to, according to the type of the node, determine the number of times that the random access preamble sequence is repeatedly sent on the random access resource;

The transceiver module 910 is configured to send the random access preamble sequence to the network device.

Optionally, the type of the node includes: a relay node or a terminal device.

In an optional implementation manner, the processing module 920 is further configured to: determine that the apparatus is a relay node.

Optionally, the processing module 920 is configured to obtain indication information, specifically including:

Obtain the indication information through dedicated signaling; or

Obtain the indication information through a system broadcast message; or

The indication information is obtained through configuration information.

It should be understood that the random access apparatus 900 according to this embodiment of the present application may correspond to the method of the terminal device in the foregoing method embodiments, for example, the method in FIG. 2 or the method in FIG. 4 , and the various modules in the apparatus 900 The above and other management operations and/or functions are respectively to implement the corresponding steps of the method of the first node in the foregoing method embodiments, and thus can also achieve the beneficial effects in the foregoing method embodiments, which are not repeated here for brevity.

It should also be understood that each module in the apparatus 900 may be implemented in the form of software and/or hardware, which is not specifically limited. In other words, the apparatus 900 is presented in the form of functional modules. A "module" herein may refer to an application-specific integrated circuit ASIC, a circuit, a processor and memory executing one or more software or firmware programs, an integrated logic circuit, and/or other devices that may provide the above-described functions. Optionally, in a simple embodiment, those skilled in the art can imagine that the apparatus 900 may take the form shown in FIG. 10 . The processing module 920 may be implemented by the processor 1001 and the memory 1002 shown in FIG. 10 . The transceiver module 910 can be implemented by the transceiver 1003 shown in FIG. 10 . Specifically, the processor is implemented by executing the computer program stored in the memory. Optionally, when the apparatus 900 is a chip, the function and/or implementation process of the transceiver module 910 may also be implemented by pins or circuits. Optionally, the memory is a storage unit in the chip, such as a register, a cache, etc., and the storage unit may also be a storage unit in the computer device located outside the chip, such as the memory shown in FIG. 10 . 1002.

FIG. 10 shows a schematic structural diagram of an apparatus 1000 for random access according to an embodiment of the present application. As shown in FIG. 10 , the apparatus 1000 includes: a processor 1001 .

In a possible implementation manner, the processor 1001 is configured to invoke an interface to perform the following actions: send a random access preamble sequence to the network device; the processor 1001 is configured to: determine that no data has been received from the network device A response message; determining a first timing advance for resending the random access preamble sequence, the first timing advance being determined by a first parameter, and the first parameter includes: the apparatus sends a random access preamble sequence phase an offset ahead of the time when the random access preamble was sent last time; the transceiver processor 1001 is further configured to invoke an interface to perform the following actions: send the random access preamble to the network device according to the first time advance.

In a possible implementation manner, the processor 1001 is configured to invoke an interface to perform the following actions: receive access configuration information from a network device, where the access configuration information includes: time-frequency resources of a random access preamble sequence, The node type that uses the time-frequency resource; the processor 1001 is configured to: determine, according to the access configuration information, use the access configuration information to perform random access; the processor 1001 is further configured to invoke an interface to execute The following actions: send a random access preamble sequence to the network device.

In a possible implementation manner, the processor 1001 is configured to: obtain indication information, where the indication information includes: the number of times the random access preamble sequence is repeatedly sent on the random access resource, and the repeated sending is adopted. The type of the node for the number of random access preamble sequences; the processor 1001 is further configured to, according to the type of the node, determine the number of times the random access preamble sequence is repeatedly sent on the random access resource; the processing The device 1001 is further configured to invoke the interface to perform the following action: send the random access preamble sequence to the network device.

It should be understood that the processor 1001 may invoke an interface to perform the above-mentioned transceiving actions, wherein the invoked interface may be a logical interface or a physical interface, which is not limited thereto. Alternatively, the physical interface can be implemented by a transceiver. Optionally, the apparatus 1000 further includes a transceiver 1003 .

Optionally, the apparatus 1000 further includes a memory 1002, and the memory 1002 can store the program codes in the foregoing method embodiments, so that the processor 1001 can call them.

Specifically, if the apparatus 1000 includes a processor 1001, a memory 1002 and a transceiver 1003, the processor 1001, the memory 1002 and the transceiver 1003 communicate with each other through an internal connection path to transmit control and/or data signals. In a possible design, the processor 1001, the memory 1002, and the transceiver 1003 may be implemented in a chip, and the processor 1001, the memory 1002, and the transceiver 1003 may be implemented in the same chip, or may be implemented in different chips, respectively. Or any two functions are combined in one chip. The memory 1002 may store program codes, and the processor 1001 invokes the program codes stored in the memory 1002 to implement corresponding functions of the apparatus 1000 .

It should be understood that the apparatus 1000 may also be used to perform other steps and/or operations on the first node side in the foregoing embodiments, which will not be repeated here for brevity.

FIG. 11 shows a schematic block diagram of an apparatus 1100 for random access according to an embodiment of the present application. The apparatus 1100 is configured to execute the method executed by the network device in the foregoing method embodiments. Optionally, the specific form of the apparatus 1100 may be a network device or a chip in the network device. This embodiment of the present application does not limit this. The apparatus 1100 includes:

The transceiver module 1110 is configured to send a first parameter to the first node, where the first parameter includes: a time advance offset of the random access preamble sequence sent by the first node compared to the previous random access preamble sequence sent;

The transceiver module 1110 is further configured to receive a random access preamble sequence sent by the first node according to the time advance offset.

In an optional implementation manner, the transceiver module 1110 is further configured to:

sending a random access response RAR message to the first node, where the RAR message includes a second timing advance;

receiving a notification message from the first node, the notification message including information for the network device to update the second timing advance;

The apparatus further includes: a processing module 1120, configured to update the second timing advance according to the notification message.

Optionally, the notification message includes information on cumulative values of multiple timing advance offsets of the random access preamble sequences sent by the first node for multiple times; or, the notification message includes multiple times of sending random access A third timing advance obtained by adding a cumulative value of multiple timing advance offsets into the preamble sequence and the second timing advance.

Optionally, the first parameter further includes: a maximum number of times of sending the same random access preamble sequence using the time advance offset by the first node.

The foregoing apparatus 1100 may also execute another embodiment of the present application, which specifically includes:

A transceiver module 1110, configured to send access configuration information to the first node, where the access configuration information includes: time-frequency resources of a random access preamble sequence, and node types using the time-frequency resources;

The transceiver module 1110 is further configured to receive a random access preamble sequence sent by the first node according to the access configuration information.

Optionally, the node type includes: a relay node or a terminal device.

Optionally, the time-frequency resources include time-domain resources and frequency-domain resources of at least one random access in one or more radio frames; or,

The time-frequency resources include time-domain resources and frequency-domain resources of at least one random access in one or more radio frames, and the access configuration information further includes period information of the time-frequency resources; or,

The time-frequency resources include multiple random access time-domain resources and frequency-domain resources in one or more radio frames, and the access configuration information further includes: at least one of the time-frequency resources and the at least one time-frequency resource. Period information corresponding to the frequency resource.

In an optional implementation manner, the time-frequency resources of the random access preamble sequence include: resources that support the terminal device to send the random access preamble sequence using a first random access preamble format, wherein the first random access preamble sequence The access preamble format is different from the coverage supported by the second random access preamble format used by the terminal device.

The foregoing apparatus 1100 may also execute another embodiment of the present application, which specifically includes:

The transceiver module 1110 is configured to send indication information to the first node, where the indication information includes: the number of times the random access preamble sequence is repeatedly sent on the random access resource, and the node that uses the number of times the random access preamble sequence is repeatedly sent type;

The transceiver module 1110 is further configured to receive a random access preamble sequence sent by the first node according to the indication information.

Optionally, the type of the node includes: a relay node or a terminal device.

In an optional implementation manner, the transceiver module 1110 is configured to send indication information to the first node, specifically including:

Send the indication information to the first node through dedicated signaling; or,

Send the indication information to the first node through a system broadcast message; or,

The indication information is sent to the first node through configuration information.

It should be understood that the apparatus 1100 for random access according to this embodiment of the present application may correspond to the method of the network device or the second node in the foregoing method embodiments, for example, the method in FIG. 2 or the method in FIG. 4 , and in the apparatus 1100 The above-mentioned and other management operations and/or functions of the respective modules are respectively to implement the corresponding steps of the method of the network device or the second node in the foregoing method embodiments, so the beneficial effects in the foregoing method embodiments can also be realized. For the sake of brevity, here I won't go into details.

It should also be understood that each module in the apparatus 1100 may be implemented in the form of software and/or hardware, which is not specifically limited. In other words, the apparatus 1100 is presented in the form of functional modules. A "module" herein may refer to an application-specific integrated circuit ASIC, a circuit, a processor and memory executing one or more software or firmware programs, an integrated logic circuit, and/or other devices that may provide the above-described functions. Optionally, in a simple embodiment, those skilled in the art can imagine that the apparatus 1100 may take the form shown in FIG. 11 . The processing module 1120 may be implemented by the processor 1201 and the memory 1202 shown in FIG. 12 . The transceiver module 1110 can be implemented by the transceiver 1203 shown in FIG. 12 . Specifically, the processor is implemented by executing the computer program stored in the memory. Optionally, when the apparatus 1100 is a chip, the function and/or implementation process of the transceiver module 1110 may also be implemented by pins or circuits. Optionally, the memory is a storage unit in the chip, such as a register, a cache, etc., and the storage unit may also be a storage unit in the computer device located outside the chip, such as the memory shown in FIG. 12 . 1202.

FIG. 12 shows a schematic structural diagram of an apparatus 1200 for random access according to an embodiment of the present application. As shown in FIG. 12 , the apparatus 1200 includes: a processor 1201 .

In a possible implementation manner, the processor 1201 is configured to invoke an interface to perform the following actions: send a first parameter to the first node, where the first parameter includes: the first node sends a random access preamble sequence phase The offset is earlier than the time when the random access preamble sequence was sent last time; and the random access preamble sequence sent by the first node according to the time advance offset is received.

In a possible implementation manner, the processor 1201 is configured to invoke an interface to perform the following actions: to send access configuration information to the first node, where the access configuration information includes: a time-frequency of a random access preamble sequence resource, which is the node type using the time-frequency resource; and is further configured to receive a random access preamble sequence sent by the first node according to the access configuration information.

In a possible implementation manner, the processor 1201 is configured to invoke an interface to perform the following action: to send indication information to the first node, where the indication information includes: repeatedly sending a random access preamble on the random access resource The number of times of the sequence adopts the type of the node that repeatedly sends the random access preamble sequence; it is also used for receiving the random access preamble sequence sent by the first node according to the indication information.

It should be understood that the processor 1201 may invoke an interface to perform the above-mentioned transceiving action, wherein the invoked interface may be a logical interface or a physical interface, which is not limited thereto. Alternatively, the physical interface can be implemented by a transceiver. Optionally, the apparatus 1200 further includes a transceiver 1203 .

Optionally, the apparatus 1200 further includes a memory 1202, and the memory 1202 can store the program codes in the foregoing method embodiments, so as to be called by the processor 1201.

Specifically, if the apparatus 1200 includes the processor 1201, the memory 1202 and the transceiver 1203, the processor 1201, the memory 1202 and the transceiver 1203 communicate with each other through an internal connection path to transmit control and/or data signals. In a possible design, the processor 1201, the memory 1202, and the transceiver 1203 may be implemented in a chip. The processor 1201, the memory 1202, and the transceiver 1203 may be implemented in the same chip, or may be implemented in different chips. Or any two functions are combined in one chip. The memory 1202 may store program codes, and the processor 1201 invokes the program codes stored in the memory 1202 to implement corresponding functions of the apparatus 1200 . It should be understood that the apparatus 1200 may also be configured to perform other steps and/or operations on the network device side in the foregoing embodiments, which will not be repeated here for brevity.

The methods disclosed in the above embodiments of the present application may be applied to a processor, or implemented by a processor. A processor may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method embodiments may be completed by a hardware integrated logic circuit in a processor or an instruction in the form of software. The aforementioned processor may be a general-purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable A logic device, a discrete gate or transistor logic device, and a discrete hardware component may also be a system on chip (SoC), a central processor unit (CPU), or a network processor (network processor, NP), may also be a digital signal processing circuit (digital signal processor, DSP), may also be a microcontroller unit (micro controller unit, MCU), may also be a programmable logic device (programmable logic device, PLD) or other integrated chips. The methods, steps, and logic block diagrams disclosed in the embodiments of this application can be implemented or executed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in conjunction with the embodiments of the present application may be directly embodied as executed by a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor. The software modules may be located in random access memory, flash memory, read-only memory, programmable read-only memory or electrically erasable programmable memory, registers and other storage media mature in the art. The storage medium is located in the memory, and the processor reads the information in the memory, and completes the steps of the above method in combination with its hardware.

It can be understood that the memory in this embodiment of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory. The non-volatile memory may be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically programmable Erase programmable read-only memory (electrically EPROM, EEPROM) or flash memory. Volatile memory may be random access memory (RAM), which acts as an external cache. By way of example and not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (double data rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (enhanced SDRAM, ESDRAM), synchronous link dynamic random access memory (synchlink DRAM, SLDRAM) And direct memory bus random access memory (directrambus RAM, DR RAM). It should be noted that the memory of the systems and methods described herein is intended to include, but not be limited to, these and any other suitable types of memory.

Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each particular application, but such implementations should not be considered beyond the scope of this application.

Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the above-described systems, devices and units may refer to the corresponding processes in the foregoing method embodiments, which will not be repeated here.

In the several embodiments provided in this application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored, or not implemented. On the other hand, the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution in this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as independent products, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be embodied in the form of a software product in essence, or the part that contributes to the prior art or the part of the technical solution. The computer software product is stored in a storage medium, including Several instructions are used to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: a U disk, a removable hard disk, a read-only memory ROM, a random access memory RAM, a magnetic disk or an optical disk and other media that can store program codes.

The above are only specific embodiments of the present application, but the protection scope of the present application is not limited to this. should be covered within the scope of protection of this application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims (42)

1. A method for random access, comprising: The first node sends a random access preamble sequence to the network device; the first node determines that a response message from the network device is not received; The first node determines a first timing advance for retransmitting the random access preamble sequence, the first timing advance is determined by a first parameter, and the first parameter includes: the first node sends a random access preamble. The time advance offset of the incoming preamble sequence compared to the previous time when the random access preamble sequence was sent; The first node sends a random access preamble sequence to the network device according to the first timing advance. 2. The method according to claim 1, wherein the method further comprises: receiving, by the first node, a random access response RAR message from the network device, where the RAR message includes a second timing advance; The first node sends a notification message to the network device according to the timing advance offset and the second timing advance, where the notification message includes a notification message for the network device to determine the second timing advance. information to be updated. 3 . The method according to claim 2 , wherein the notification message includes information on cumulative values of multiple timing advance offsets for sending random access preamble sequences for multiple times; or, the notification message includes It includes a third timing advance obtained by adding a cumulative value of multiple timing advance offsets for sending random access preamble sequences multiple times and the second timing advance. The method according to any one of claims 1 to 3, wherein the first parameter further comprises: the maximum number of times of sending the same random access preamble sequence using the time advance offset; Wherein, the first node sends a random access preamble sequence to the network device according to the first timing advance, including: The first node determines that the number of times of sending the random access preamble sequence is less than or equal to the number of times of sending the maximum time advance offset; The first node adjusts the sending timing, and the adjusted sending timing includes advancing the sending time relative to the previous sending by the time advance offset; The first node sends a random access preamble sequence to the network device according to the adjusted sending timing. 5. The method according to any one of claims 1 to 4, wherein the method further comprises: The first node receives the first parameter from a second node that is an upper-level node of the first node. 6. A method for random access, comprising: The first node receives access configuration information from a network device, where the access configuration information includes: a time-frequency resource of a random access preamble sequence, and a node type that uses the time-frequency resource; The first node determines to use the access configuration information to perform random access according to the access configuration information; The first node sends a random access preamble sequence to the network device. 7. The method according to claim 6, wherein the node type comprises: a relay node or a terminal device. 8. The method according to claim 6 or 7, characterized in that, The time-frequency resources include at least one random access time-domain resource and frequency-domain resource in one or more radio frames; or, The time-frequency resources include time-domain resources and frequency-domain resources of at least one random access in one or more radio frames, and the access configuration information further includes period information of the time-frequency resources; or, The time-frequency resources include multiple random access time-domain resources and frequency-domain resources in one or more radio frames, and the access configuration information further includes: at least one of the time-frequency resources and the at least one time-frequency resource. Period information corresponding to the frequency resource. The method according to any one of claims 6 to 8, wherein determining, by the first node, according to the access configuration information, to use the access configuration information to perform random access, comprising: The first node determines, according to the node type, that the first node uses the time-frequency resource to perform random access. The method according to claim 9, wherein determining, by the first node, according to the node type, that the first node uses the access configuration information to perform random access, comprising: the first node It is determined that the node type is a relay node. 11. The method of claim 9, wherein the method further comprises: The first node determines that the node type is a terminal device; The first node determines not to perform random access on the time-frequency resource configured in the access configuration information. The method according to any one of claims 6 to 11, wherein the time-frequency resource of the random access preamble sequence comprises: supporting a terminal device to send a random access preamble using a first random access preamble format resources of the sequence, wherein the coverage range supported by the first random access preamble format and the second random access preamble format used by the terminal device is different. The method according to any one of claims 6 to 12, wherein the sending, by the first node, a random access preamble sequence to the network device comprises: The first node sends a random access preamble sequence to the network device according to the period information of the time-frequency resource. 14. A method for random access, comprising: The network device sends a first parameter to the first node, where the first parameter includes: a time advance offset of the random access preamble sequence sent by the first node compared to the previous time the random access preamble sequence was sent; The network device receives the random access preamble sequence sent by the first node according to the timing advance offset. 15. The method of claim 14, wherein the method further comprises: sending, by the network device, a random access response RAR message to the first node, where the RAR message includes a second timing advance; receiving, by the network device, a notification message from the first node, the notification message including information for the network device to update the second timing advance; The network device updates the second timing advance according to the notification message. 16 . The method according to claim 15 , wherein, the notification message includes information about cumulative values of multiple timing advance offsets of random access preamble sequences sent by the first node for multiple times; or, The notification message includes a third timing advance obtained by adding a cumulative value of multiple timing advance offsets for sending random access preamble sequences multiple times and the second timing advance. 17. The method according to any one of claims 14 to 16, wherein the first parameter further comprises: the maximum application of the timing advance offset when the first node sends the same random access preamble sequence amount of sending times. 18. A method for random access, comprising: The network device sends access configuration information to the first node, where the access configuration information includes: a time-frequency resource of a random access preamble sequence, and a node type that uses the time-frequency resource; The network device receives the random access preamble sequence sent by the first node according to the access configuration information. 19. The method according to claim 18, wherein the node type comprises: a relay node or a terminal device. 20. The method of claim 18 or 19, wherein The time-frequency resources include at least one random access time-domain resource and frequency-domain resource in one or more radio frames; or, The time-frequency resources include time-domain resources and frequency-domain resources of at least one random access in one or more radio frames, and the access configuration information further includes period information of the time-frequency resources; or, The time-frequency resources include multiple random access time-domain resources and frequency-domain resources in one or more radio frames, and the access configuration information further includes: at least one of the time-frequency resources and the at least one time-frequency resource. Period information corresponding to the frequency resource. 21. The method according to any one of claims 18 to 20, wherein the time-frequency resource of the random access preamble sequence comprises: supporting a terminal device to send a random access preamble using a first random access preamble format resources of the sequence, wherein the coverage range supported by the first random access preamble format and the second random access preamble format used by the terminal device is different. 22. An apparatus for random access, comprising: a transceiver module, used for sending a random access preamble sequence to the network device; a processing module, configured to determine that a response message from the network device is not received; The processing module is further configured to determine a first timing advance for retransmitting the random access preamble sequence, where the first timing advance is determined by a first parameter, where the first parameter includes: the apparatus sends a random The time advance offset of the access preamble sequence compared to the time when the random access preamble sequence was sent last time; The transceiver module is further configured to send a random access preamble sequence to the network device according to the first timing advance. 23. The apparatus according to claim 22, wherein the transceiver module is further configured to: receiving a random access response RAR message from the network device, where the RAR message includes a second timing advance; According to the timing advance offset and the second timing advance, a notification message is sent to the network device, where the notification message includes information for the network device to update the second timing advance. 24 . The apparatus according to claim 23 , wherein the notification message includes information on cumulative values of multiple timing advance offsets for sending random access preamble sequences multiple times; or, the notification message contains It includes a third timing advance obtained by adding a cumulative value of multiple timing advance offsets for sending random access preamble sequences multiple times and the second timing advance. 25. The apparatus according to any one of claims 22 to 24, wherein the first parameter further comprises: the maximum number of times of sending the same random access preamble sequence using the time advance offset; Wherein, the processing module is used for: determining that the number of times of sending the random access preamble sequence is less than or equal to the number of times of sending the maximum time advance offset; Adjusting the sending timing, where the adjusting the sending timing includes advancing the sending time relative to the previous sending by the time advance offset; The transceiver module is further configured to send a random access preamble sequence to the network device according to the adjusted sending timing. 26. The apparatus according to any one of claims 22 to 25, wherein the transceiver module is further configured to: receive the first parameter from a second node, the second node being the apparatus the upper-level node. 27. An apparatus for random access, comprising: a transceiver module, configured to receive access configuration information from a network device, where the access configuration information includes: time-frequency resources of a random access preamble sequence, and node types using the time-frequency resources; a processing module, configured to determine to use the access configuration information to perform random access according to the access configuration information; The transceiver module is further configured to: send a random access preamble sequence to the network device. 28. The apparatus according to claim 27, wherein the node type comprises: a relay node or a terminal device. 29. The device of claim 27 or 28, wherein The time-frequency resources include at least one random access time-domain resource and frequency-domain resource in one or more radio frames; or, The time-frequency resources include time-domain resources and frequency-domain resources of at least one random access in one or more radio frames, and the access configuration information further includes period information of the time-frequency resources; or, The time-frequency resources include multiple random access time-domain resources and frequency-domain resources in one or more radio frames, and the access configuration information further includes: at least one of the time-frequency resources and the at least one time-frequency resource. Period information corresponding to the frequency resource. 30. The apparatus according to any one of claims 27 to 29, wherein the processing module is further configured to determine, according to the access configuration information, to use the access configuration information to perform random access, specifically comprising: : According to the node type, it is determined that the apparatus uses the time-frequency resource for random access. 31. The apparatus according to claim 30, wherein the processing module is further configured to determine, according to the node type, that the apparatus uses the access configuration information to perform random access, specifically comprising: determining the The node type described above is a relay node. 32. The apparatus according to claim 30, wherein the processing module is further configured to: determine that the node type is a terminal device; It is determined that random access is not performed on the time-frequency resources configured in the access configuration information. 33. The apparatus according to any one of claims 27 to 32, wherein the time-frequency resource of the random access preamble sequence comprises: supporting a terminal device to send a random access preamble using a first random access preamble format resources of the sequence, wherein the coverage range supported by the first random access preamble format and the second random access preamble format used by the terminal device is different. 34. The device according to any one of claims 27 to 33, wherein the transceiver module is further configured to: According to the period information of the time-frequency resource in the access configuration information, a random access preamble sequence is sent to the network device. 35. An apparatus for random access, comprising: a transceiver module, configured to send a first parameter to a first node, where the first parameter includes: a time advance offset of the random access preamble sequence sent by the first node compared to the previous time the random access preamble sequence was sent; The transceiver module is further configured to receive a random access preamble sequence sent by the first node according to the time advance offset. 36. The apparatus according to claim 35, wherein the transceiver module is further configured to: sending a random access response RAR message to the first node, where the RAR message includes a second timing advance; receiving a notification message from the first node, the notification message including information for the network device to update the second timing advance; The apparatus further includes: a processing module configured to update the second timing advance according to the notification message. 37 . The apparatus according to claim 36 , wherein the notification message includes information about cumulative values of multiple timing advance offsets of random access preamble sequences sent by the first node for multiple times; or, The notification message includes a third timing advance obtained by adding a cumulative value of multiple timing advance offsets for sending random access preamble sequences multiple times and the second timing advance. 38. The apparatus according to any one of claims 35 to 37, wherein the first parameter further comprises: the maximum application of the timing advance offset for sending the same random access preamble sequence by the first node amount of sending times. 39. An apparatus for random access, comprising: a transceiver module, configured to send access configuration information to the first node, where the access configuration information includes: a time-frequency resource of a random access preamble sequence, and a node type that uses the time-frequency resource; The transceiver module is further configured to receive a random access preamble sequence sent by the first node according to the access configuration information. 40. The apparatus according to claim 39, wherein the node type comprises: a relay node or a terminal device. 41. The device of claim 39 or 40, wherein The time-frequency resources include at least one random access time-domain resource and frequency-domain resource in one or more radio frames; or, The time-frequency resources include time-domain resources and frequency-domain resources of at least one random access in one or more radio frames, and the access configuration information further includes period information of the time-frequency resources; or, The time-frequency resources include multiple random access time-domain resources and frequency-domain resources in one or more radio frames, and the access configuration information further includes: at least one of the time-frequency resources and the at least one time-frequency resource. Period information corresponding to the frequency resource. 42. The apparatus according to any one of claims 39 to 41, wherein the time-frequency resource of the random access preamble sequence comprises: supporting a terminal device to send a random access preamble using a first random access preamble format resources of the sequence, wherein the coverage range supported by the first random access preamble format and the second random access preamble format used by the terminal device is different.

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