CN110831236A

CN110831236A - Random access method and device

Info

Publication number: CN110831236A
Application number: CN201810903995.0A
Authority: CN
Inventors: 袁世通; 陈磊; 刘凤威
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2018-08-09
Filing date: 2018-08-09
Publication date: 2020-02-21
Also published as: WO2020030003A1

Abstract

A method and an apparatus for random access are provided, the method comprising: a first node sends a random access leader sequence to network equipment; determining that a response message from the network device is not received; determining a first timing advance for re-accessing the preamble sequence, the first timing advance being determined by a first parameter, the first parameter comprising: the first node sends the time advance offset of the random access leader sequence compared with the random access leader sequence sent last time; and sending the random access preamble sequence to the network equipment according to the first time advance. Compared with the random access configuration in the existing process of sending the leader sequence before random access by adopting the terminal equipment, the embodiment of the application is beneficial to improving the probability of successfully accessing the network by sending the random access leader sequence to the network equipment in advance aiming at the remote nodes beyond the coverage area of the cell.

Description

Random access method and device

Technical Field

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

Background

Random Access (Random Access) refers to a 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 a fifth generation communication system (5th generation mobile networks or 5th generation wireless systems, 5G), Integrated Access and Backhaul (IAB) nodes are evolved nodes of relay technology. In wireless communication networks, relay nodes are typically used to achieve extended coverage or shadow coverage, or to boost system capacity. When relay nodes are used to achieve extended coverage, IAB nodes are typically deployed at the cell edge or further away. If the IAB node is accessed to the network, the process of randomly accessing the network by the terminal equipment is used, and the IAB node is failed to access due to the fact that the IAB node is far away from the upper node or the base station and exceeds the coverage area of the cell. Therefore, how to increase the probability of the IAB node accessing the network is a problem to be considered in the current IAB standardization.

Disclosure of Invention

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

In a first aspect, a method for random access is provided, including: a first node sends a random access leader sequence to network equipment; the first node determines that a response message from the network equipment is not received; the first node determines a first timing advance for retransmitting the random access preamble sequence, wherein the first timing advance is determined by a first parameter, and the first parameter comprises: the first node sends the time advance offset of the random access leader sequence compared with the random access leader sequence sent last time; and the first node sends a random access preamble sequence to the network equipment according to the first time advance. Compared with the normal flow of sending the leader sequence before random access by adopting the terminal equipment, the embodiment of the application is beneficial to improving the probability of successfully accessing the network by sending the random access leader sequence to the network equipment in advance aiming at the remote nodes beyond the coverage area of the cell.

In one possible implementation, the method further includes:

a first node receives a Random Access Response (RAR) message from network equipment, wherein the RAR message comprises a second time advance;

and the first node sends a notification message to the network equipment according to the time advance offset and the second time advance, wherein the notification message comprises information used for updating the second time advance by the network equipment.

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

Optionally, the notification message includes information of an accumulated value of a plurality of time advance offsets of the multiple-time transmission random access preamble sequence; or, the notification message includes a third time advance obtained by adding the second time advance to an integrated value of a plurality of time advance offsets of the multiple transmission random access preamble sequence.

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

In one possible implementation manner, the first parameter further includes: sending the sending times of the maximum application time advance offset of the same random access leader sequence;

the sending, by the first node, the random access preamble sequence to the network device according to the first time advance includes:

the first node determines that the sending times of the random access leader sequence is less than or equal to the sending times of the maximum application time advance offset;

the first node adjusts the sending timing, and the adjusted sending timing comprises the size of the sending time relative to the previous sending advance time advance offset;

and the first node sends the random access leader sequence to the network equipment according to the adjusted sending timing.

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

Here, the first node transmits the random access preamble sequence to the network device a number of transmissions that is less than or equal to the maximum applied time advance offset using the time advance offset. If the first node successfully receives the response message of the network device using the time advance offset to send the random access preamble sequence once, the first node does not need to send the random access preamble sequence again.

In one possible implementation, the method further includes: the first node receives a first parameter from a second node, which is an upper node of the first node.

In a second aspect, a method for random access is provided, including: the first node receives access configuration information from the network equipment, wherein the access configuration information comprises: randomly accessing time-frequency resources of the leader sequence, and using the node type of the time-frequency resources; the first node determines to use the access configuration information for random access according to the access configuration information; the first node transmits a random access preamble sequence to the network device. Therefore, the success rate of random access of the first node is improved by providing the access configuration information for the first node.

Optionally, the node types include: a relay node or a terminal device.

In one possible implementation, the time-frequency resource includes at least one randomly accessed time-domain resource and frequency-domain resource in one or more radio frames; alternatively, the first and second electrodes may be,

the time-frequency resource comprises at least one randomly accessed time-domain resource and frequency-domain resource in one or more wireless frames, wherein the access configuration information also comprises period information of the time-frequency resource; alternatively, the first and second electrodes may be,

the time-frequency resources include time-domain resources and frequency-domain resources of multiple random accesses 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 determining, by the first node, to perform random access using the access configuration information according to the access configuration information includes:

and the first node determines that the first node uses the time-frequency resource to carry out random access according to the node type.

Optionally, the determining, by the first node, that the first node performs random access using the access configuration information according to the node type includes: the first node determines the node type as a relay node.

Optionally, the method further comprises: the first node determines the node type as terminal equipment; the first node determines not to perform random access on the access configuration information. Here, if the first node determines to be the terminal device, the terminal device does not perform random access on the random access resource configured for the relay node by the network device.

In one possible implementation, the time-frequency resource of the random access preamble sequence includes: and supporting the terminal equipment to transmit the resource of the random access preamble sequence by using a first random access preamble format, wherein the coverage range supported by the first random access preamble format and the second random access preamble format used by the terminal equipment is different. Here, if the first node determines to be the terminal device, the terminal device may perform random access using a long-format random access preamble (i.e., a random access preamble having a wider coverage than a normal format).

In one possible implementation manner, the sending, by the first node, the random access preamble sequence to the network device includes:

and the first node sends a random access leader sequence to the network equipment according to the period information of the time-frequency resource of the access configuration information. Here, the first node may perform random access using a long period (i.e., a period longer than a normal period, where the normal period is an access period configured by the network device for the terminal device), and accordingly, the network device may perform detection in the long period to improve a success probability of the random access of the first node.

In a third aspect, a method for random access is provided, including: the first node acquires indication information, wherein the indication information comprises: repeatedly sending the random access leader sequence on the random access resource for times, and adopting the type of the node repeatedly sending the random access leader sequence for times; the first node determines the times of repeatedly sending the random access leader sequence on the random access resource according to the type of the node; the first node transmits a random access preamble sequence to the network device. In the embodiment of the application, by reducing the repetition times of the preamble in the random access preamble sequence and filling the reduced part of the corresponding sequence length with the guard interval (GT or GP), the interference between the preamble sent by the relay node and other symbols can be avoided, so that the probability of successfully detecting the preamble by the network device is increased.

Optionally, the types of nodes include: a relay node or a terminal device.

Optionally, the method comprises: the first node determines that the first node is a relay node. Here, the first node initiates random access with the number of times of transmitting the random access preamble sequence corresponding to the relay node.

In a possible implementation manner, the obtaining, by the first node, the indication information includes:

the first node acquires the indication information through a special signaling; or

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

And the first node acquires the indication information through the configuration information.

Therefore, the first node can acquire the indication information in a flexible manner.

In a fourth aspect, a method for random access is provided, including: the network equipment sends a first parameter to the first node, wherein the first parameter comprises: the first node sends the time advance offset of the random access leader sequence compared with the random access leader sequence sent last time; the network equipment receives a random access preamble sequence sent by a first node. Therefore, for a long-distance node beyond the coverage of a cell, the network equipment configures a time advance offset for the first node, so that the first node sends a random access preamble sequence to the network equipment in advance, and the probability of successfully accessing the network is improved.

Optionally, the network device sends a random access response RAR message to the first node, where the RAR message includes the second time advance; the network device receives a notification message from the first node, the notification message including information for the network device to update the second timing advance.

In one possible implementation manner, the first parameter further includes: the number of transmissions of the maximum application time advance offset of the same random access preamble sequence.

In a fifth aspect, a method for random access is provided, including: the network equipment sends access configuration information to the first node, wherein the access configuration information comprises: randomly accessing time-frequency resources of the leader sequence, and using the node type of the time-frequency resources; the network equipment receives a random access preamble sequence sent by a first node. Therefore, for the remote nodes 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 is beneficial to improving the probability of successfully accessing the network.

Optionally, the node types include: a relay node or a terminal device.

Optionally, the time-frequency resource includes at least one randomly accessed time-domain resource and frequency-domain resource in one or more radio frames; alternatively, the first and second electrodes may be,

the time-frequency resource comprises at least one random access time-domain resource and frequency-domain resource in one or more wireless frames, and the access configuration information also comprises period information of the time-frequency resource; alternatively, the first and second electrodes may be,

Optionally, the time-frequency resource of the random access preamble sequence includes: and supporting the terminal equipment to transmit the resource of the random access preamble sequence by using a first random access preamble format, wherein the coverage range supported by the first random access preamble format and the second random access preamble format used by the terminal equipment is different.

In a sixth aspect, a method for random access is provided, including: the network equipment sends indication information to the first node, wherein the indication information comprises: repeatedly sending the random access leader sequence on the random access resource for times, and adopting the type of the node repeatedly sending the random access leader sequence for times; the network equipment receives a random access preamble sequence sent by a first node. Therefore, for the remote nodes beyond the coverage of the cell, the network device configures the first node with the times of repeatedly sending the random access preamble sequence on the random access resource, so that the first node sends the random access preamble sequence to the network device according to the times of repeatedly sending the random access preamble sequence, and the probability of successfully accessing the network is improved.

Optionally, the types of nodes include: a relay node or a terminal device.

In one possible implementation manner, the sending, by the network device, the indication information to the first node includes:

the network equipment sends indication information to the first node through a special signaling; alternatively, the first and second electrodes may be,

the network equipment sends indication information to the first node through a system broadcast message; alternatively, the first and second electrodes may be,

the network equipment sends 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 flexible, and is not particularly limited.

In a seventh aspect, a communication device is provided, which includes means for performing the method of the first aspect or any possible implementation manner of the first aspect, or means for performing the method of the second aspect or any possible implementation manner of the second aspect, or means for performing the method of the third aspect or any possible implementation manner of the third aspect.

In an eighth aspect, a communication device is provided, which includes means for performing the method of the fourth aspect or any possible implementation manner of the fourth aspect, or means for performing the method of the fifth aspect or any possible implementation manner of the fifth aspect, or means for performing the method of the sixth aspect or any possible implementation manner of the sixth aspect.

In a ninth aspect, a communication apparatus is provided, which may be a first node (such as an IAB node or a terminal device) in the above method design, or a chip disposed in the first node. The communication device includes: a processor, coupled to the memory, may be configured to execute the instructions in the memory to implement the method performed by the first node in the first aspect, the second aspect, or the third aspect, or any one of its possible implementations. Optionally, the communication device further comprises a memory. Optionally, the communication device further comprises a communication interface, the processor being coupled to the communication interface.

When the communication device is a 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.

Alternatively, the transceiver may be a transmit-receive circuit. Alternatively, the input/output interface may be an input/output circuit.

In a tenth aspect, a communication apparatus is provided, which may be a network device designed by the method described above, or a chip provided in the network device. The communication device includes: a processor, coupled to the memory, and configured to execute the instructions in the memory to implement the method performed by the network device in the fourth, fifth, or sixth aspect and any possible implementation manner thereof. Optionally, the communication device further comprises a memory. Optionally, the communication device further comprises a communication interface, the processor being 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 a network device, the communication interface may be an input/output interface.

In an eleventh aspect, there is provided a program for performing the method of any one of the first to sixth aspects and possible implementations thereof when executed by a processor.

In a twelfth aspect, a program product is provided, the program product comprising: program code which, when executed by a communication unit, processing unit or transceiver, processor of a communication apparatus (e.g. a network device or a first node), causes the communication device to perform the method of any of the first to sixth aspects and possible embodiments thereof as described above.

In a thirteenth aspect, there is provided a computer-readable storage medium storing a program for causing a communication apparatus (e.g., a network device or a first node) to perform the method of any one of the first to sixth aspects and possible embodiments thereof.

Drawings

Fig. 1 is a system architecture diagram to which embodiments of the present application are applied.

Fig. 2 is a schematic flow chart of a method of random access 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 flow chart diagram of a method of random access 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 yet 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 a device 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 a device for random access according to another embodiment of the present application.

Detailed Description

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

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

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

The network device in this embodiment may be a device for communicating with a terminal device, where the network device may be a Base Transceiver Station (BTS) in a global system for mobile communications (GSM) system or a Code Division Multiple Access (CDMA) system, may also be a base station (NodeB) in a Wideband Code Division Multiple Access (WCDMA) system, may also be an evolved NodeB (eNB) or eNodeB) in an LTE system, may also be a wireless controller in a Cloud Radio Access Network (CRAN) scenario, or may be a relay station, an access point, a vehicle-mounted device, a wearable device, a network device in a future 5G network, or a network device in a future evolved PLMN network, and the like, and the present embodiment is not limited.

In the embodiment of the 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 a memory (also referred to as a main memory). The operating system may be any one or more computer operating systems that implement business processing through processes (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 comprises applications such as a browser, an address list, word processing software, instant messaging software and the like. Furthermore, the embodiment of the present application does not particularly limit the specific structure of the execution main body of the method provided by the embodiment of the present application, as long as the communication can be performed according to the method provided by the embodiment of the present application by running the program recorded with the code of the method provided by the embodiment of the present application, for example, the execution main body of the method provided by the embodiment of the present application may be a terminal device or a network device, or a functional module capable of calling the program and executing the program in the terminal device or the network device.

In addition, 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 herein is intended to encompass a computer program accessible from any computer-readable device, carrier, or media. For example, computer-readable media can include but are not limited to magnetic storage devices (e.g., hard disk, floppy disk, magnetic strips, etc.), optical disks (e.g., Compact Disk (CD), Digital Versatile Disk (DVD), etc.), smart cards, and flash memory devices (e.g., erasable programmable read-only memory (EPROM), card, stick, or key drive, etc.). In addition, 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" can include, without being limited to, wireless channels and various other media capable of storing, containing, and/or carrying instruction(s) 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 devices, namely a network device, a relay device and a terminal device. Wherein the relay device is outside the intended coverage of the network device. 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".

A relay device may be deployed further away from a base station or access device than at a 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 the terminal device, access within a super-cell coverage area may occur, which may cause access failure of the relay device and cause interference to the terminal device within the coverage area of the network device.

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

Alternatively, the relay device may be a Relay Node (RN), a relay transmission and reception point (rrp), or an 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 a wireless air interface, the IAB relay system may support multi-stage relay, i.e., one relay device is connected to the host base station through another relay device. And should not be construed as a relay device that supports only one-hop relaying as shown in fig. 1.

For convenience of description, the following defines basic terms or concepts used in the present application.

The upper node: the node providing the wireless backhaul link resources, the network device, the superordinate node called relay device,

a subordinate node: nodes that use backhaul link resources for data transmission to or reception from the network are referred to as subordinate nodes, e.g., a relay device is referred to as a subordinate node of the network device, and the network is a network on a core network or other access network, e.g., the internet, a private network, etc.

And accessing a link: an access link refers to a radio link used by a node to communicate with its subordinate nodes, and includes uplink and downlink transmission links. Uplink transmission on the access link is also referred to as uplink transmission of the access link, and downlink transmission is also referred to as downlink transmission of the access link. Including but not limited to the aforementioned IAB nodes.

A return link: the backhaul link refers to a wireless link used when a certain node communicates with its upper node, and includes uplink and downlink transmission links. Uplink transmissions on the backhaul link are also referred to as uplink transmissions of the backhaul link, and downlink transmissions are also referred to as downlink transmissions of the backhaul link. Including but not limited to the aforementioned IAB nodes.

Taking the terminal device as the UE as an example, the process of accessing the UE to the network specifically includes: (1) message (Msg) 1: UE sends preamble code to base station; (2) msg 2: a base station sends a Random Access Response (RAR) message to UE; (3) the UE sends a message 3 to the base station according to the RAR message (Msg 3); (4) msg 4: and the base station sends a competition resolving message to the UE to inform the UE of successful access.

When accessing a mobile communication system or performing data transmission, a UE needs to acquire a Timing Advance (TA). The TA value may indicate a distance between the UE and the base station, or the TA value is introduced for uplink synchronization, so as to facilitate subsequent uplink data transmission. The TA value acquisition process comprises the following steps: the method includes that a UE sends a known sequence to a base station, for example, a random access preamble (random access preamble) in a non-contention access scenario or a contention access scenario, the base station calculates a TA value according to the known sequence and sends the TA value to the UE, wherein the TA value can be carried in a Random Access Response (RAR) message sent by the base station to the UE. For example, the UE may receive a 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 an uplink transmission resource for the UE to send uplink data; cell temporary identity (TC-RNTI) information for identifying the UE within a cell.

For a node (such as a long-distance IAB node) far away from a network device, if a random access resource configuration used by the UE in the existing procedure is still used to initiate random access, because the distance between the node and the base station is too large, when a random access preamble sequence reaches the network device, the random access preamble sequence exceeds a detection window of the network device, access within a super-cell coverage area occurs, thereby causing access failure of the IAB node and causing interference to the UE within the coverage area of the network device. The embodiment of the application proposes a random access method to increase the probability that a node farther away from a network device successfully accesses a network.

In order to solve the above problem, the present application provides a random access method, including: a first node sends a random access leader sequence to network equipment; the first node determines that a response message from the network equipment is not received; the first node determines a first timing advance for retransmitting the random access preamble sequence, wherein the first timing advance is determined by a first parameter, and the first parameter comprises: the first node sends the time advance offset of the random access leader sequence compared with the random access leader sequence sent last time; and the first node sends a random access preamble sequence to the network equipment according to the first time advance. Compared with the normal flow of sending the leader sequence before random access by adopting the terminal equipment, the embodiment of the application is beneficial to improving the probability of successfully accessing the network by sending the random access leader sequence to the network equipment in advance aiming at the remote nodes beyond the coverage area of the cell.

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

The application also provides a random access method, which comprises the following steps: the first node receives access configuration information from the network equipment, wherein the access configuration information comprises: randomly accessing time-frequency resources of the leader sequence, and using the node type of the time-frequency resources; the first node determines to use the access configuration information for random access according to the access configuration information; the first node transmits a random access preamble sequence to the network device. Therefore, the success rate of random access is improved by providing the first node with the access configuration information.

The application also provides a random access method, which comprises the following steps: the first node acquires indication information, wherein the indication information comprises: repeatedly sending the random access leader sequence on the random access resource for times, and adopting the type of the node repeatedly sending the random access leader sequence for times; the first node determines the times of repeatedly sending the random access leader sequence on the random access resource according to the type of the node; the first node transmits a random access preamble sequence to the network device. In the embodiment of the application, by reducing the repetition times of the preamble in the random access preamble sequence and filling the reduced part of the corresponding sequence length with the guard interval (GT or GP), the interference between the preamble sent by the relay node and other symbols can be avoided, so that the probability of successfully detecting the preamble by the network device is increased.

Fig. 2 shows a schematic flow diagram of a method 200 of random access according to an embodiment of the application. As shown in fig. 2, the method 200 includes:

s210, the first node sends a random access preamble sequence to the network equipment.

The first node may be understood as a node that is further away from the network device. The first node sends a random access preamble sequence to the network device, which may not be detected by the network device. The network device may be a host base station or a superior relay node. When the first node is far from the network device, due to the existence of air interface transmission delay, the random access preamble sent by the first node may already exceed the detection range of the network device, so that the preamble cannot be correctly detected. It should be understood that the random access preamble here may be a random access preamble initially sent by the first node, or may be a random access preamble sequence sent by the first node after adjusting uplink transmission timing (optionally, the transmission timing may be understood as a transmission opportunity) after the transmission fails, which is not limited in this application.

Alternatively, 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 the IAB node, and all other nodes or devices with access requirements that cannot successfully perform random access due to being far away from the network device are applicable to the method for random access in this embodiment of the present application, which is not limited thereto.

S220, the first node determines that the response message from the network device is not received. Wherein the response message is a random access response, RAR, message.

After the first node sends the random access preamble sequence to the network device, the first node determines that the response message sent by the network device is not received after waiting for a certain time window, and then the first node may consider that the network device does not detect or does not correctly detect the random access preamble sequence sent by the first node, and then the first node needs to resend the random access preamble sequence. Generally, waiting for a certain time window is protocol defined, and may be defining different time windows for different nodes. If different time windows are defined for different nodes, the access nodes need to be informed by 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 may be configured as a different time window by default according to a protocol, which is not limited in this application. If the access node is notified by a system message, the type of device to which the time window belongs needs to be indicated in the system message.

S230, the first node determines a first timing advance for retransmitting the random access preamble sequence, where the first timing advance is determined by a first parameter, and the first parameter includes: the first node transmits the random access preamble sequence at an offset in time advance of a previous transmission of the random access preamble sequence.

In this embodiment of the present application, before the first node retransmits the random access preamble sequence, it is necessary to determine a first time advance for subsequently transmitting the random access preamble sequence. Since the random access preamble sequence that the first node attempts to send in step S210 may not be detected by the network device, the first node needs to adjust the first timing advance and then resend the random access preamble sequence to the network device. The first time advance is determined in accordance with a first parameter.

Optionally, the first parameter may include: the first node transmits the random access preamble sequence at an offset in time advance compared to a previous transmission of the random access preamble sequence.

It should be understood that the first timing advance is different from the conventional timing advance, and the first timing advance is a process in which the first node determines the sending timing again by itself after the first node does not receive the RAR of the network. If the first node is transmitting the random access preamble for the first time, as mentioned above, the first time advance is not used to transmit the random access preamble in advance. Under the condition that the RAR is not received, the first node can send the random access preamble in advance through the adjustment of the uplink sending timing, so that the random access failure caused by the fact that the random access preamble sent by the first node cannot be received by the network equipment due to the fact that the distance between the first node and the network equipment is too far can be avoided. Adjusting the transmission timing means that the first node advances the time by the offset amount to transmit the random access preamble based on the last transmission timing.

The first time advance may be a time advance offset from the last advance transmission, in which case the first time advance and the time advance offset are the same. The first timing advance may be a sum of timing advance offsets accumulated by transmitting the same random access preamble a plurality of times, and in this case, when the first timing advance is used for timing, the first timing advance is a timing offset with respect to the first transmission of the random access preamble. The present application does not limit which scheme is employed.

The time advance offset can be understood as a time step. The first node may send the random access preamble sequence to the network device in advance using the time advance offset. For example, the first node sends the random access preamble sequence to the network device for the first time, and determines that no response message of the network device is received, so that the first node sends the random access preamble sequence to the network device for the second time, at a time earlier than the time of the first sending (i.e., a time advance offset); if the first node determines that the response message of the network device is not received after sending the random access preamble sequence to the network device for the second time, the first node sends the random access preamble sequence to the network device for the third time before the time of sending the random access preamble sequence for the second time (i.e., the time advance offset), … repeats the process, and the time advance offset is accumulated step by step until the first node receives the response message of the network device.

Alternatively, the time advance offset may be characterized by a time unit. For example, the time unit may be a symbol, a slot, a mini-slot, a millisecond (ms), or a basic time unit T defined in a protocol_c＝1/(Δf_max·N_f) Is an integer multiple of (a), where Δ f_max＝480·10³Hz，N_fIn the present application, the value of the time advance offset or the time unit is not limited to 4096 or other time units.

Optionally, the first parameter may further include: the number of transmissions of the maximum application time advance offset of the same random access preamble sequence. The first node may send the random access preamble sequence to the network device using the time advance offset and the maximum number of times the time advance offset is applied to be sent. Here, the first node transmits the random access preamble sequence to the network device a number of transmissions that is less than or equal to the maximum applied time advance offset using the time advance offset. For example, if the first node successfully receives the response message of the network device once sending the random access preamble sequence using the time advance offset, the first node does not need to send the random access preamble sequence again. That is, the first node transmits the number of transmissions of the random access preamble sequence using the time advance offset as long as the number of transmissions of the maximum applied time advance offset is not exceeded.

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 protocol predefined.

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

Specifically, the first node transmits the random access preamble sequence at a timing earlier than a timing at which the random access preamble sequence was transmitted at a previous time using the first parameter. If the first node does not receive the response message of the network device, it needs to loop through the above steps S210-S230, i.e. the timing of each sent random access preamble sequence is advanced by the time offset from the previous sending timing. Therefore, the first node sends the random access leader sequence in advance through the stepping accumulation, so that the random access leader sequence of the first node can fall into a detection window of the network equipment after being transmitted in a long distance, and the success rate of the first node accessing the network is improved.

The method for determining the first timing advance and the specific representation thereof are as described above and will not be described in detail.

Taking the timing of sending Msg1 by the terminal device and the IAB node in fig. 3 as an example, as shown in fig. 3, the terminal device may send Msg1 (including preamble) to the host base station periodically. Assuming that the timing of the first Msg1 sent by the IAB node is the same as the sending timing of the terminal device, if the IAB node does not receive the RAR message of the network device after the first Msg1 sent by the IAB node, the IAB node advances the time by an offset compared with the timing of the first Msg1 sent by the second Msg 1. Similarly, if the IAB node still does not receive the RAR message from the network device after the second Msg1 transmission, the IAB node advances the time by the offset amount in comparison to the second Msg1 transmission when sending the Msg1 for the third time. As can be seen from fig. 3, the IAB node performs the step-by-step accumulation of random access preamble sequences to the network device with the time advance offset as a step length, and the terminal device does not perform the function of adjusting the transmission timing automatically.

Optionally, the method 200 further comprises:

the network equipment sends a Random Access Response (RAR) message to the first node. Correspondingly, the first node receives a RAR message from the network device.

The RAR message includes a second time advance, and the first node sends a notification message to the network device according to the time advance offset of the first parameter and the second time advance, where the notification message includes information used for the network device to update the second time advance. Correspondingly, the network device receives a notification message from the first node.

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

Specifically, after successfully receiving the random access preamble sequence of the first node, the network device sends a random access response RAR message to the first node, where the RAR message includes a second timing advance, and the second timing advance is similar to that in the existing flow and is used for 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, where the notification message may include information used for the network device to update the second timing advance. And, the network device may transmit a contention resolution message to the first node, the contention resolution message being used to inform the first node of successful access.

The second timing advance in the RAR message is an estimation result based on detection of the random access preamble sequence sent by the first node by the network device, and the timing estimation method is the same as the conventional timing estimation method. However, the network device does not know how long the first node has sent the random access preamble sequence in advance, and 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 information of the accumulated value of the time advance offsets sent in advance to the network device, or directly send a third time advance obtained by adding the accumulated value of the multiple time advance offsets of the multiple random access preamble sequences and the second time advance to the network device.

Optionally, the notification message sent by the first node to the network device includes information of an accumulated value of a plurality of time advance offsets of the random access preamble sequence sent multiple times. Specifically, although the network device configures the first node with a time or a step length that needs to be advanced each time, the network device does not know an accumulated value of the time advance offsets after the first node transmits the random access preamble sequence a plurality of times (the accumulated value is used for statistically accumulating the time advance offsets). Therefore, the first node may inform the network device of the accumulated value of the time advance offset, so that the network device may 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 for subsequent use.

Or, the notification message includes a third time advance obtained by adding the second time advance to an integrated value of a plurality of time advance offsets of the random access preamble sequence transmitted a plurality of times. Specifically, the first node may feed back the calculated actual time advance (i.e., the third time advance) to the network device, so that the network device directly updates based on the actual time advance fed back by the first node.

Optionally, the first node may further obtain indication information for indicating the power climbing manner. Specifically, the first node may also consider a factor of power ramping when transmitting the random access preamble sequence using the first parameter. The concept of the mechanism of power ramp can be seen in the existing protocols (specifically, the standard protocols 3GPP TS38.321 V15.2.0 and 3GPP TS 38.331 V15.2.1), which are briefly introduced here as follows: for the same random access preamble sequence, the first node starts with retransmitting the random access preamble sequence for the second time, and each time needs to compensate for the extra power, wherein the extra power needed to be supplemented can be calculated by the following formula:

(PREAMBLE_POWER_RAMPING_COUNTER–1)×PREAMBLE_POWER_RAMPING_STEP，

wherein, the initial value of PREAMBLE _ POWER _ RAMPING _ COUNTER is 1, and the POWER is ramped up by COUNTER +1 every time, the PREAMBLE _ POWER _ RAMPING _ COUNTER is called as COUNTER; wherein, the PREAMBLE _ POWER _ mapping _ STEP is configured by the network device through the broadcast system message. It should be understood that the specific explanation of the above formula can be referred to the description in the standard protocol 3GPP TS 38.3215.1.1, and for brevity, the detailed description is not repeated.

For example, after the first node uses the time advance offset to advance the transmission time by one time, the first node uses the same random access preamble sequence to perform power ramp, and after the same random access preamble sequence reaches the maximum transmission frequency applying the time advance offset, the first node advances the transmission time by one time again to perform power ramp from the beginning.

For another example, after the first node uses the time advance offset to advance the transmission time by one time, the first node uses the same random access preamble sequence to perform power ramp-up, and after the same random access preamble sequence reaches the maximum transmission frequency applying the time advance offset, the first node advances the transmission time by one time again, and does not perform power ramp-up from the beginning, but continues to ramp-up based on the previous transmission power until the maximum power is reached, and then does not continue to ramp-up.

For another example, after the first node performs power ramp-up once, it starts to transmit the random access preamble sequence according to the time advance offset, and after the same random access preamble sequence reaches the maximum transmission number of the time advance offset, it ramps up once again, and then keeps the ramped-up power to start transmitting the random access preamble sequence by using the time advance offset from the beginning.

The foregoing describes a manner in which the first node transmits the random access preamble sequence in advance through stepwise accumulation to increase the success rate of random access. The present application further provides another embodiment, which improves the success rate of random access by providing access configuration information for the first node. As will be described in detail below.

Fig. 4 shows a schematic flow chart of a method 400 according to another embodiment of the present application. As shown in fig. 4, the method 400 includes:

s410, the network equipment sends access configuration information to the first node, wherein the access configuration information comprises time-frequency resources of the random access leader sequence and node types of the time-frequency resources. Correspondingly, the first node receives access configuration information from the network device.

Optionally, the node types include: a relay node or a terminal device.

The time-frequency resources comprise at least one randomly accessed time domain resource and frequency domain resource in one or more wireless frames; alternatively, the first and second electrodes may be,

In one possible implementation, the network device configures an independent random access resource (e.g., a Physical Random Access Channel (PRACH)) for the relay node. Specifically, the time-frequency resource in the access configuration information may be configured for each radio frame, or configured for an odd radio frame, or configured for an even radio frame to include the random access resource of the relay node, where the specific configuration mode is similar to the conventional configuration mode of the random access resource, but includes a node type that the configured random access resource can use. If the configuration mode is adopted, the configuration itself contains period information, that is, each radio frame, or the radio frame with the odd number or the even number, is configured with time frequency resources of random access, wherein the time frequency resources comprise time domain resources and frequency domain resources of the random access resources in the radio frame. Optionally, the random access resource satisfies one or more of the following conditions: the random access resource and the access resource used by the terminal equipment are time-division on the time domain; the random access resource and the access resource used by the terminal equipment are frequency-divided on a frequency domain; the random access resources are code-divided over the code domain with the access resources used by the terminal device. Optionally, the random access resource configured by the network device for the relay node may further include one or more of the following information: the frequency domain position of the random access resource, the 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 (which is not specifically listed here, and may specifically refer to related configuration information in the prior art). That is, in this implementation, the network device additionally configures a set of random access resource configuration for the relay node, where the configuration is dedicated to the relay node to initiate random access, so as to improve the probability of successful access of the relay node. It should be noted that, for the case of configuring the random access resource specifically for the relay node, the random access resource may directly correspond 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. 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 limit the embodiments of the present application.

Optionally, the access configuration information may further include period information of a time-frequency resource, so that, in combination with the time-frequency resource, the relay node may determine a resource that the relay node may use for random access. Because the number of the relay nodes is relatively small, once the random access is finished, the random access is stable, and the frequent random access can not occur, so that the time of the random access can be sacrificed to save the resource overhead. One possible configuration is that the time-frequency resource in the access configuration information specifies an initial radio frame number, frequency domain resource information, and period information of the time-frequency resource, and may further include a subframe number or a time slot number of the time-frequency resource. The period of the random access resource of the relay node can be lengthened through the period information of the time-frequency resource, and the resource consumption is reduced.

In one possible implementation, the random access resource of the relay node is a partial resource of the random access resource of the terminal device. Specifically, one or more time-frequency resources may be selected from the random access resources of the terminal device for the random access of the relay node, and similarly, each radio frame, or a radio frame with an odd number of radio frames, or a radio frame with an even number of radio frames, may include the random access resources of the relay node; or appointing to select one or more time-frequency resources from the random access resources of the terminal equipment, appointing the initial wireless frame number and the period information corresponding to the adaptive resources, and selecting the random access resources of one or more terminal equipments at regular intervals for the random access resources of the relay node. It should be understood that, at this time, the node type of the random access resource also needs to be specified, and considering the compatibility of the terminal device, the terminal device needs to identify that there may be a relay node on some resources to perform transmission of the random access preamble sequence, so that it may adopt to avoid selecting those random access resources that may collide with the relay node to initiate transmission of the random access preamble sequence. That is, if one or more resources are extracted from all random access resources configured for the relay node to use, and all random access resources are configured for the terminal device to use, at this time, the terminal device may choose not to transmit on a specific resource (i.e., the resource configured for the relay node), depending on the protocol definition, which is not limited thereto. In some cases, these conflicting resources may not be avoided, and the application is not limited to this, depending on the protocol definition and the specific scheme design.

It should be understood that the above node type may not show configuration, and especially when the relay node uses part of the resources of the terminal device for random access, a collision resource may be configured, and the collision resource is used for the relay node for random access. Therefore, the node type may also be determined by the conflicting resource indication, depending on the protocol definition. For example, it is specified that, if the conflict resource option is configured, the conflict resource is configured for the relay node. The present application is not limited to the specific definition.

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

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

Optionally, the determining, by the first node, that the first node performs random access using the access configuration information according to the node type includes: the first node determines the node type as a relay node. Specifically, the first node determines that the node type of the first node is the relay node, and then 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, the random access resource is selected according to the node type corresponding to the time-frequency resource in the random access configuration information. Because the random access resources of the relay node and the terminal equipment are different, the first node only carries out random access on the resources which can be used by the relay node. The random access using the access configuration information includes: and selecting the time frequency resource in the access configuration information according to the node type, and sending the 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 not described in detail above.

In one possible implementation, if the terminal device performs random access, only the random access resource that can be used by the terminal device is selected for random access. If the random access resource of the relay node is a part of the random access resource of the terminal device, time-frequency resource information of a collision resource needs to be configured in addition in the random access resource configuration of the terminal device. I.e. the collision resource is configured, the collision 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 (namely the first node is the relay node), performs random access by using the time-frequency resource configured by the network equipment and used for sending the random access preamble sequence, and sends the random access preamble sequence to the network equipment.

In the embodiment of the present application, for the case that 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 the terminal device, and then the first node determines that the random access is not performed on the collision resource or the random access resource that is not available to the middle-end device. The collision resource refers to that the relay node performs random access by using a part of random access resources of the terminal device, and as described above, the details are not repeated. If the random access resource of the terminal equipment and the random access resource of the relay node are configured independently, the terminal equipment does not use the random access resource of the relay node for random access. In the first implementation manner, the terminal device uses a normal (normal) random access preamble format, and may wait for the next time for random access of the generic random access resource (the generic random access resource is an access resource that is normally configured for the terminal device by the network device).

Optionally, as a second implementation manner, if the first node determines that the node type of the first node is the terminal device, the first node determines to perform random access using the first random access preamble format. Wherein, the time frequency resource of the random access leader sequence comprises: and supporting the terminal equipment to send the resources of the random access preamble sequence by using a first random access preamble format, wherein the coverage range supported by the first random access preamble format is different from that supported by a second random access preamble format used by the terminal equipment, 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 may support long range coverage access. In this second implementation, the relay node may also use the first random access preamble format for random access. In this implementation, the random access resource used by the relay node may be a partial resource 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. This can improve the efficiency of using the random access resources.

Taking the example in fig. 5 as an example, the period of the random access resource (i.e., the normal resource shown in fig. 5, i.e., the resource used for normal Msg1 transmission) configured by the network device for the UE is 20 ms. The random access resource used by the IAB node may be a partial resource of the random access resource used by the UE (i.e., the special resource shown in fig. 5, i.e., the resource used for special Msg1 transmissions). The UE may use the special resource by using the long-format random access preamble, or the UE may ignore the special resource and wait for the next random access resource to perform the random access.

In this embodiment, the network device may configure not only the time-frequency resource of the random access preamble sequence for the first node, but also cycle information of the time-frequency resource for the first node. The first node may initiate access to the network device by using the period information of the time-frequency resource, and the configuration of the period information of the specific time-frequency resource is as described above and is not described again. Optionally, as an implementation manner, the S430 includes:

and the first node sends a random access leader sequence to the network equipment according to the period information of the time-frequency resource.

The period information of the time-frequency resource may be a random access periodic resource configured for the first node by the network device. The first node may determine a resource for random access according to the period information, and may periodically send a random access preamble sequence to the network device when the random access preamble transmission fails, where the periodic sending of the random access preamble sequence to the network device 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. Accordingly, after the network device detects the random access preamble sequence sent by the terminal device, the network device may extend the detection window to continue the detection, so as to detect whether the relay node sends the random access preamble sequence, thereby increasing the probability that the relay node successfully accesses the network.

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 20ms (corresponding to the receive window of the normal Msg1 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 receive window of the special Msg1 shown in fig. 6). For the network device, after the random access preamble sequence of the UE is detected in the normal window, the receive window for detecting the normal Msg1 may be extended, and the detection may be continued in the special receive window, so as to improve the access success rate of the IAB node.

If the IAB node performs random access using the receiving window of the special Msg1 in fig. 6, the example in fig. 7 is used to describe the corresponding processing of the network device, as shown in fig. 7, after the network device detects the random access preamble sequence sent by the UE in the original receiving window, the detection window may be extended, and the detection may be continued in the extended detection window. If the random access preamble sequence sent by the IAB node falls into the extended detection window, the network equipment can detect in the extended detection window, and the success rate of the random access of the IAB node is improved.

The application also provides another embodiment, and the probability of successful access of the first node is improved by configuring the times of corresponding random access leader sequences for the first node. As will be described in detail below.

This embodiment comprises the steps of:

the first node acquires indication information, wherein the indication information comprises: repeatedly sending the random access leader sequence on the random access resource for times, and adopting the type of the node repeatedly sending the random access leader sequence for times;

the first node determines the times of repeatedly sending the random access leader sequence on the random access resource according to the type of the node;

the first node transmits 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 to this.

Specifically, the first node determines that the node type is the terminal device (i.e., the first node is the terminal device), and then the first node performs random access using the normal number of repetitions configured for the terminal device by the network device.

Or, the first node determines that the node type is a relay node (i.e., the first node is a relay node), and then the first node transmits the random access preamble sequence on the random access resource by using the number of times that the random access preamble sequence is repeatedly transmitted corresponding to the relay node. Specifically, the format of the random access preamble sequence is divided into three parts, which are sequentially: cyclic prefix CP, preamble and GP. The repeated sending times corresponding to the relay nodes can be realized by the following modes: by reducing the repetition times of the preamble in the random access preamble sequence and filling the reduced part of the corresponding sequence length with a guard time (GT or GP), the interference between the preamble sent by the relay node and other symbols can be avoided, thereby increasing the probability of successfully detecting the preamble by the network device.

The acquisition indication information may be obtained from the network by signaling, for example, through a broadcast message of the network, such as a system message, or defined by a protocol. If the protocol is defined, the first node may be obtained through local configuration, and specifically, may be obtained through a local configuration table. Aiming at different node types, the repeated sending times are different when the random access preamble sequence is sent on one random access resource, so that the relay node is prevented from generating interference on the following time slot or sub-frame of the random access resource due to the over-long distance.

It should be noted that, in the embodiment of the present application, the number of times of preamble repetition specifically refers to: after determining the preamble format and the subcarrier spacing, N in the preamble sequence_uNumber of repeats of the middle root sequence. The meaning of the number of repetitions is described below by way of example in table 1. It should be understood that the terms or concepts referred to in table 1 may be referred to in the description of the prior art and will not be described herein for brevity. As shown in table 1 below:

TABLE 1

Taking the format B4 in Table 1 as an example, the repetition number of preamble corresponding to the format B4 is 12 · 2048 κ · 2^-μ12 in the present embodiment, if the relay node determines that the B4 format is adopted, the method is implementedThe number of repetitions 12 needs to be reduced and the reduced sequence length is filled in with the GP.

It should be understood that the above-mentioned number of repetitions is related to the format of the random access preamble, and thus the type of node for which the number of repetitions is directed is also related to the format of the random access preamble.

This is described below in connection with the example of fig. 8. Taking the terminal device as UE, the first node as IAB, and the network device as base station as an example for description, as shown in fig. 8, UE and IAB node respectively send Msg1 to the base station, where Msg1 is composed of CP, preamble sequence (sequence), and GP. The base station detects that there is transmission delay in both the Msg1 sent by the UE and the Msg1 sent by the IAB node. As can be seen from fig. 8, the base station detects Msg1 sent by the UE in the detection window. Taking 3 repetitions of the sequence in the Msg1 sent by the IAB (3 repetitions means that the sequence is sent 3 times) for sending, the partial sequence of the Msg1 sent by the IAB falls outside the detection window of the base station, which may cause the sequence of the Msg1 sent by the IAB to interfere with other sign bits of the base station, resulting in the base station failing to correctly detect the Msg1 sent by the IAB. Here, the number of times of repetition of the sequence in Msg1 sent by IAB is reduced from 3 times to one time, and the reduced part is filled with GP, so that the sequence outside the detection window becomes GP, thereby avoiding the interference of the sequence beyond the detection window of the base station with other sign bits of the base station, and enabling the base station to correctly detect Msg1 sent by IAB according to the sequence in the window.

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

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

Alternatively, the first indication information may be predefined by a protocol, and in a specific implementation, the first node may locally store 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 8 are only for facilitating the understanding of the embodiments of the present application by those skilled in the art, and are not intended to limit the embodiments of the present application to the specific scenarios illustrated. It will be apparent to those skilled in the art that various equivalent modifications or variations are possible in light of the examples shown in fig. 5-8, and such modifications or variations are intended to be included within the scope of the embodiments of the present application.

It should also be understood that the various aspects of the embodiments of the present application can be combined and used reasonably, and the explanation or illustration of the various terms appearing in the embodiments can be mutually referred to or explained in the various embodiments, which is not limited.

It should also be understood that, in the various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

The method for random access according to the embodiment of the present application is described in detail above with reference to fig. 1 to 8. An apparatus for random access according to an embodiment of the present application will be described below with reference to fig. 9 and 12. It should be understood that the technical features described in the method embodiments are equally applicable to the following apparatus 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 perform the method performed by the first node in the previous method embodiment. Alternatively, 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 a terminal device. The embodiments of the present application do not limit this. The apparatus 900 comprises:

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, and the first parameter includes: the device sends the time advance offset of the random access leader sequence compared with the random access leader sequence sent last time;

the transceiver module 910 is further configured to send a random access preamble sequence to a 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 equipment, wherein the RAR message comprises a second time advance;

and sending a notification message to the network equipment according to the time advance offset and the second time advance, wherein the notification message comprises information used for the network equipment to update the second time advance.

In an optional implementation manner, the notification message includes information of an accumulated value of a plurality of time advance offsets of the random access preamble sequence sent multiple times; or, the notification message includes a third time advance obtained by adding an accumulated value of a plurality of time advance offsets of the multiple-time transmission random access preamble sequence and the second time advance.

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

wherein the processing module 920 is configured to:

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

adjusting the sending timing, wherein the adjusted sending timing comprises advancing the sending time by the time advance offset relative to the previous sending;

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: receiving the first parameter from a second node, the second node being an upper node of the apparatus.

The apparatus 900 may further perform another embodiment of the present application, which is as follows:

a transceiver module 910, configured to receive access configuration information from a network device, where the access configuration information includes: randomly accessing a time frequency resource of a leader sequence, and using a node type of the time frequency resource;

a processing module 920, configured to determine to perform random access using the access configuration information according to the access configuration information;

the transceiver module 910 is further configured to: and sending a random access preamble sequence to the network equipment.

Optionally, the node types include: a relay node or a terminal device.

In an optional implementation manner, the time-frequency resource includes at least one randomly accessed time-domain resource and frequency-domain resource in one or more radio frames; alternatively, the first and second electrodes may be,

the time-frequency resource comprises at least one randomly accessed time-domain resource and frequency-domain resource in one or more wireless frames, and the access configuration information also comprises period information of the time-frequency resource; alternatively, the first and second electrodes may be,

the time-frequency resource comprises a plurality of randomly accessed time-domain resources and frequency-domain resources in one or more wireless frames, and the access configuration information further comprises: at least one time frequency resource and period information corresponding to the at least one time frequency resource.

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

and the device determines that the device uses the time frequency resource to carry out random access according to the node type.

Optionally, the processing module 920 is configured to determine, according to the node type, that the apparatus uses the access configuration information to perform random access, and specifically includes: and the device determines the node type as the relay node, and correspondingly, the device uses the time-frequency resource corresponding to the relay node to carry out random access.

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

determining the node type as terminal equipment;

and determining that random access is not performed on the time-frequency resources configured by the access configuration information.

In an optional implementation manner, the time-frequency resource of the random access preamble sequence includes: and supporting the terminal equipment to send the resource of the random access preamble sequence by using a first random access preamble format, wherein the coverage range supported by the first random access preamble format is different from the coverage range supported by a second random access preamble format used by the terminal equipment.

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

and sending a random access preamble sequence to the network equipment according to the period information of the time-frequency resource of the access configuration information.

the processing module 920 is configured to obtain indication information, where the indication information includes: repeatedly sending the times of the random access leader sequence on the random access resource, and adopting the type of the node repeatedly sending the times of the random access leader sequence;

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

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

Optionally, the types of the nodes include: a relay node or a terminal device.

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

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

acquiring the indication information through a special signaling; or

Acquiring the indication information through system broadcast information; or

And acquiring the indication information through configuration information.

It should be understood that the apparatus 900 for random access according to the embodiment of the present application may correspond to the method of the terminal device in the foregoing method embodiment, for example, the method in fig. 2 or the method in fig. 4, and the above and other management operations and/or functions of each module in the apparatus 900 are respectively for implementing corresponding steps of the method of the first node in the foregoing method embodiment, so that beneficial effects in the foregoing method embodiment may also be implemented, and for brevity, are not described herein again.

It should also be understood that the various modules in the apparatus 900 may be implemented in software and/or hardware, and are not particularly limited in this regard. In other words, the apparatus 900 is presented in the form of a functional module. As used herein, a "module" may refer to an Application Specific Integrated Circuit (ASIC), an electronic circuit, a processor and memory that execute one or more software or firmware programs, an integrated logic circuit, and/or other devices that may provide the described functionality. Alternatively, in a simple embodiment, one skilled in the art will recognize that the device 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 transceiving module 910 may be implemented by the transceiver 1003 shown in fig. 10. In particular, the processor is implemented by executing a computer program stored in the memory. Alternatively, when the apparatus 900 is a chip, the functions and/or implementation processes of the transceiver module 910 can also be implemented by pins or circuits. Optionally, the memory is a storage unit in the chip, such as a register, a cache, and the like, and the storage unit may also be a storage unit located outside the chip in the computer device, such as the memory 1002 in fig. 10.

Fig. 10 shows a schematic block 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 one possible implementation, the processor 1001 is configured to invoke an interface to perform the following actions: sending a random access leader sequence to the network equipment; the processor 1001 is configured to: determining that a response message from the network device is not received; determining a first timing advance for retransmitting the random access preamble sequence, the first timing advance being determined by a first parameter comprising: the device sends the time advance offset of the random access leader sequence compared with the random access leader sequence sent last time; the transceiver processor 1001 is also configured to invoke an interface to perform the following actions: and sending a random access preamble sequence to network equipment according to the first time advance.

In one possible implementation, the processor 1001 is configured to invoke an interface to perform the following actions: receiving access configuration information from a network device, the access configuration information comprising: randomly accessing a time frequency resource of a leader sequence, and using a node type of the time frequency resource; the processor 1001 is configured to: determining to use the access configuration information for random access according to the access configuration information; the processor 1001 is further configured to invoke an interface to perform the following actions: and sending a random access preamble sequence to the network equipment.

In one possible implementation, the processor 1001 is configured to: the method is used for acquiring indication information, and the indication information comprises: repeatedly sending the times of the random access leader sequence on the random access resource, and adopting the type of the node repeatedly sending the times of the random access leader sequence; the processor 1001 is further configured to determine, according to the type of the node, a number of times that a random access preamble sequence is repeatedly transmitted on the random access resource; the processor 1001 is further configured to invoke an interface to perform the following actions: and sending the random access preamble sequence to network equipment.

It should be understood that the processor 1001 may call an interface to perform the transceiving action, wherein the called interface may be a logical interface or a physical interface, which is not limited thereto. Alternatively, the physical interface may be implemented by a transceiver. Optionally, the apparatus 1000 further comprises a transceiver 1003.

Optionally, the apparatus 1000 further includes a memory 1002, and the memory 1002 may store the program codes in the above method embodiments, so as to be called by the processor 1001.

Specifically, if the device 1000 includes the processor 1001, the memory 1002 and the transceiver 1003, the processor 1001, the memory 1002 and the transceiver 1003 communicate with each other via the internal connection path to transmit control and/or data signals. In one possible design, the processor 1001, the memory 1002, and the transceiver 1003 may be implemented by chips, 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, or any two functions may be implemented in one chip. The memory 1002 may store program code, which the processor 1001 invokes to implement the corresponding functions of the device 1000, stored by the memory 1002.

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, and details are not described herein 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 perform the method performed by the network device in the foregoing method embodiment. Alternatively, the specific form of the apparatus 1100 may be a network device or a chip in a network device. The embodiments of the present application do not limit this. The apparatus 1100 comprises:

a transceiver module 1110, configured to send a first parameter to a first node, where the first parameter includes: the first node sends the time advance offset of the random access leader sequence compared with the random access leader sequence sent last time;

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, wherein the RAR message comprises a second time advance;

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

the device further comprises: a processing module 1120, configured to update the second time advance according to the notification message.

Optionally, the notification message includes information of an accumulated value of multiple time advance offsets of the random access preamble sequence sent by the first node multiple times; or, the notification message includes a third time advance obtained by adding an accumulated value of a plurality of time advance offsets of the multiple-time transmission random access preamble sequence and the second time advance.

Optionally, the first parameter further includes: and the first node sends the maximum sending times of the same random access leader sequence applying the time advance offset.

The apparatus 1100 may further perform another embodiment of the present application, and specifically includes:

a transceiver module 1110, configured to send access configuration information to a first node, where the access configuration information includes: randomly accessing a time frequency resource of a leader sequence, and using a node type of the time frequency resource;

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 types include: a relay node or a terminal device.

a transceiver module 1110, configured to send indication information to a first node, where the indication information includes: repeatedly sending the times of the random access leader sequence on the random access resource, and adopting the type of the node repeatedly sending the times of the random access leader sequence;

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 types of the nodes include: 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, and specifically includes:

sending the indication information to the first node through proprietary signaling; alternatively, the first and second electrodes may be,

transmitting the indication information to the first node through a system broadcast message; alternatively, the first and second electrodes may be,

and sending the indication information to the first node through configuration information.

It should be understood that the apparatus 1100 for random access according to the embodiment of the present application may correspond to a method of a network device or a second node in the foregoing method embodiment, for example, the method in fig. 2 or the method in fig. 4, and the above and other management operations and/or functions of each module in the apparatus 1100 are respectively for implementing corresponding steps of the method of the network device or the second node in the foregoing method embodiment, so that beneficial effects in the foregoing method embodiment may also be implemented, and for brevity, no detailed description is provided here.

It is also understood that the various modules in the apparatus 1100 may be implemented in software and/or hardware, and are not particularly limited in this regard. In other words, the apparatus 1100 is presented in the form of a functional module. As used herein, a "module" may refer to an Application Specific Integrated Circuit (ASIC), an electronic circuit, a processor and memory that execute one or more software or firmware programs, an integrated logic circuit, and/or other devices that may provide the described functionality. Alternatively, in a simple embodiment, one skilled in the art will recognize 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 may be implemented by the transceiver 1203 shown in fig. 12. In particular, the processor is implemented by executing a computer program stored in the memory. Alternatively, when the apparatus 1100 is a chip, the functions and/or implementation procedures of the transceiver module 1110 can be implemented by pins, circuits or the like. Optionally, the memory is a storage unit in the chip, such as a register, a cache, and the like, and the storage unit may also be a storage unit located outside the chip in the computer device, such as the memory 1202 in fig. 12.

Fig. 12 is a schematic block 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 one possible implementation, the processor 1201 is configured to invoke an interface to perform the following actions: transmitting a first parameter to a first node, the first parameter comprising: the first node sends the time advance offset of the random access leader sequence compared with the random access leader sequence sent last time; and receiving a random access preamble sequence sent by the first node according to the time advance offset.

In one possible implementation, the processor 1201 is configured to invoke an interface to perform the following actions: the method comprises the steps of sending access configuration information to a first node, wherein the access configuration information comprises: randomly accessing a time frequency resource of a leader sequence, and using a node type of the time frequency resource; and the first node is further configured to receive a random access preamble sequence sent by the first node according to the access configuration information.

In one possible implementation, the processor 1201 is configured to invoke an interface to perform the following actions: the method comprises the steps of sending indication information to a first node, wherein the indication information comprises: repeatedly sending the times of the random access leader sequence on the random access resource, and adopting the type of the node repeatedly sending the times of the random access leader sequence; and the random access preamble sequence is further 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 transceiving action, where the invoked interface may be a logical interface or a physical interface, which is not limited thereto. Alternatively, the physical interface may be implemented by a transceiver. Optionally, the apparatus 1200 further comprises a transceiver 1203.

Optionally, the apparatus 1200 further includes a memory 1202, and the memory 1202 may store the program codes in the above 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 one possible design, the processor 1201, the memory 1202 and the transceiver 1203 may be implemented by chips, and the processor 1201, the memory 1202 and the transceiver 1203 may be implemented in the same chip, may be implemented in different chips, or any two functions may be combined and implemented in one chip. The memory 1202 may store program codes, which the processor 1201 calls to implement the corresponding functions of the apparatus 1200. It should be understood that the apparatus 1200 may also be used to perform other steps and/or operations on the network device side in the foregoing embodiments, and details are not described herein for brevity.

The method disclosed in the embodiments of the present application may be applied to a processor, or may be implemented by a processor. The processor may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method embodiments may be performed by integrated logic circuits of hardware in a processor or instructions in the form of software. The 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 logic device, a discrete gate or transistor logic device, a discrete hardware component, a system on chip (SoC), a Central Processing Unit (CPU), a Network Processor (NP), a Digital Signal Processor (DSP), a Microcontroller (MCU), a programmable logic controller (PLD), or other integrated chip. The various methods, steps, and logic blocks disclosed in the embodiments of the present application may be implemented or performed. 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 connection with the embodiments of the present application may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in a memory, and a processor reads information in the memory and completes the steps of the method in combination with hardware of the processor.

It will be appreciated that the memory in the embodiments of the subject application can be either volatile memory or nonvolatile memory, or can include both volatile and nonvolatile memory. The non-volatile memory may be a read-only memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an electrically Erasable EPROM (EEPROM), or a flash memory. Volatile memory can be Random Access Memory (RAM), which acts as external cache memory. By way of example, but not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic Random Access Memory (SDRAM), double data rate SDRAM, enhanced SDRAM, SLDRAM, Synchronous Link DRAM (SLDRAM), and direct rambus RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to comprise, without being limited to, these and any other suitable types of memory.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

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

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

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method of random access, comprising:

a first node sends a random access leader sequence to network equipment;

the first node determining 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 being determined by a first parameter comprising: the first node sends the time advance offset of the random access leader sequence compared with the random access leader sequence sent last time;

and the first node sends a random access preamble sequence to network equipment according to the first time advance.

2. The method of claim 1, further comprising:

the first node receives a Random Access Response (RAR) message from the network equipment, wherein the RAR message comprises a second time advance;

and the first node sends a notification message to the network equipment according to the time advance offset and the second time advance, wherein the notification message comprises information used for the network equipment to update the second time advance.

3. The method of claim 2, wherein the notification message includes information of an accumulated value of a plurality of time advance offsets of the random access preamble sequence transmitted a plurality of times; or, the notification message includes a third time advance obtained by adding an accumulated value of a plurality of time advance offsets of the multiple-time transmission random access preamble sequence and the second time advance.

4. The method of any of claims 1-3, wherein the first parameter further comprises: sending the maximum sending times of the time advance offset applied to the same random access leader sequence;

wherein the sending, by the first node, a random access preamble sequence to a network device according to the first time advance includes:

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

the first node adjusts the sending timing, and the adjusted sending timing comprises the time which is advanced relative to the sending of the previous time by the time advance offset;

and the first node sends a random access preamble sequence to the network equipment according to the adjusted sending timing.

5. The method according to any one of claims 1 to 4, further comprising:

the first node receives the first parameter from a second node, which is an upper node of the first node.

6. A method of random access, comprising:

the first node receives access configuration information from network equipment, wherein the access configuration information comprises: randomly accessing a time frequency resource of a leader sequence, and using a node type of the time frequency resource;

the first node determines to use the access configuration information for random access according to the access configuration information;

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

7. The method of claim 6, wherein the node type comprises: a relay node or a terminal device.

8. The method according to claim 6 or 7,

the time-frequency resource comprises at least one random access time-domain resource and frequency-domain resource in one or more wireless frames; alternatively, the first and second electrodes may be,

9. The method according to any of claims 6 to 8, wherein the first node determines to use the access configuration information for random access according to the access configuration information, comprising:

and the first node determines that the first node uses the time frequency resource to carry out random access according to the node type.

10. The method of claim 9, wherein the determining, by the first node, that the first node uses the access configuration information for random access according to the node type comprises: the first node determines that the node type is a relay node.

11. The method of claim 9, further comprising:

the first node determines the node type as terminal equipment;

and the first node determines not to perform random access on the time-frequency resources configured by the access configuration information.

12. The method according to any of claims 6 to 11, wherein the time-frequency resources of the random access preamble sequence comprise: and supporting the terminal equipment to send the resource of the random access preamble sequence by using a first random access preamble format, wherein the coverage range supported by the first random access preamble format is different from the coverage range supported by a second random access preamble format used by the terminal equipment.

13. The method according to any of claims 6 to 12, wherein the first node sends a random access preamble sequence to the network device, comprising:

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

14. A method of random access, comprising:

the network equipment sends a first parameter to a first node, wherein the first parameter comprises: the first node sends the time advance offset of the random access leader sequence compared with the random access leader sequence sent last time;

and the network equipment receives a random access preamble sequence sent by the first node according to the time advance offset.

15. The method of claim 14, further comprising:

the network equipment sends a Random Access Response (RAR) message to the first node, wherein the RAR message comprises a second time advance;

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

and the network equipment updates the second time advance according to the notification message.

16. The method of claim 15, wherein the notification message includes information of an accumulated value of a plurality of time advance offsets for which the first node transmits the random access preamble sequence a plurality of times; or, the notification message includes a third time advance obtained by adding an accumulated value of a plurality of time advance offsets of the multiple-time transmission random access preamble sequence and the second time advance.

17. The method of any of claims 14 to 16, wherein the first parameter further comprises: and the first node sends the maximum sending times of the same random access leader sequence applying the time advance offset.

18. A method of random access, comprising:

the network equipment sends access configuration information to a first node, wherein the access configuration information comprises: randomly accessing a time frequency resource of a leader sequence, and using a node type of the time frequency resource;

and the network equipment receives a random access leader sequence sent by the first node according to the access configuration information.

19. The method of claim 18, wherein the node type comprises: a relay node or a terminal device.

20. The method of claim 18 or 19,

21. The method according to any of claims 18 to 20, wherein the time-frequency resources of the random access preamble sequence comprise: and supporting the terminal equipment to send the resource of the random access preamble sequence by using a first random access preamble format, wherein the coverage range supported by the first random access preamble format is different from the coverage range supported by a second random access preamble format used by the terminal equipment.

22. An apparatus for random access, comprising:

a receiving and sending module, configured to send a random access preamble sequence to a network device;

a processing module for determining 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, and the first parameter includes: the device sends the time advance offset of the random access leader sequence compared with the random access leader sequence sent last time;

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

23. The apparatus of claim 22, wherein the transceiver module is further configured to:

24. The apparatus of claim 23, wherein the notification message comprises information of an accumulated value of a plurality of time advance offsets of a plurality of random access preamble sequences; or, the notification message includes a third time advance obtained by adding an accumulated value of a plurality of time advance offsets of the multiple-time transmission random access preamble sequence and the second time advance.

25. The apparatus of any one of claims 22 to 24, wherein the first parameter further comprises: sending the maximum sending times of the time advance offset applied to the same random access leader sequence;

wherein the processing module is configured to:

adjusting the transmission timing, the adjusting the transmission timing comprising advancing the transmission time by the time advance offset relative to a previous transmission;

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 of claims 22 to 25, wherein the transceiver module is further configured to: receiving the first parameter from a second node, the second node being an upper node of the apparatus.

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: randomly accessing a time frequency resource of a leader sequence, and using a node type of the time frequency resource;

the processing module is used for determining to use the access configuration information for random access according to the access configuration information;

the transceiver module is further configured to: and sending a random access preamble sequence to the network equipment.

28. The apparatus of claim 27, wherein the node types comprise: a relay node or a terminal device.

29. The apparatus of claim 27 or 28,

30. The apparatus according to any one of claims 27 to 29, wherein the processing module is further configured to determine to use the access configuration information for random access according to the access configuration information, specifically including:

and determining that the device uses the time frequency resource for random access according to the node type.

31. The apparatus of claim 30, wherein the processing module is further configured to determine, according to the node type, that the apparatus uses the access configuration information for random access, specifically including: and determining that the node type is a relay node.

32. The apparatus of claim 30, wherein the processing module is further configured to:

determining the node type as terminal equipment;

33. The apparatus according to any of claims 27-32, wherein the time-frequency resources of the random access preamble sequence comprise: and supporting the terminal equipment to send the resource of the random access preamble sequence by using a first random access preamble format, wherein the coverage range supported by the first random access preamble format is different from the coverage range supported by a second random access preamble format used by the terminal equipment.

34. The apparatus according to any of claims 27 to 33, wherein the transceiver module is further configured to:

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: the first node sends the time advance offset of the random access leader sequence compared with the random access leader sequence sent last time;

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 of claim 35, wherein the transceiver module is further configured to:

the device further comprises: and the processing module is used for updating the second time advance according to the notification message.

37. The apparatus according to claim 36, wherein the notification message includes information of an accumulated value of a plurality of time advance offsets at which the first node transmits the random access preamble sequence a plurality of times; or, the notification message includes a third time advance obtained by adding an accumulated value of a plurality of time advance offsets of the multiple-time transmission random access preamble sequence and the second time advance.

38. The apparatus of any one of claims 35 to 37, wherein the first parameter further comprises: and the first node sends the maximum sending times of the same random access leader sequence applying the time advance offset.

39. An apparatus for random access, comprising:

a transceiver module, configured to send access configuration information to a first node, where the access configuration information includes: randomly accessing a time frequency resource of a leader sequence, and using a node type of 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 of claim 39, wherein the node types comprise: a relay node or a terminal device.

41. The apparatus of claim 39 or 40,

42. The apparatus according to any of claims 39-41, wherein the time-frequency resources of the random access preamble sequence comprise: and supporting the terminal equipment to send the resource of the random access preamble sequence by using a first random access preamble format, wherein the coverage range supported by the first random access preamble format is different from the coverage range supported by a second random access preamble format used by the terminal equipment.