CN111918405B - Random access method, terminal and network side equipment - Google Patents

Abstract

The invention provides a random access method, a terminal and network side equipment, belonging to the technical field of wireless communication, wherein the random access method applied to the terminal comprises the following steps: and sending random access information, wherein the random access information comprises first content and second content, the first content comprises a random access lead code, the second content comprises data related to random access, a first protection interval is arranged behind a symbol where the first content is located, and a second protection interval is arranged behind a symbol where the second content is located. The invention adds a section of guard interval after the two parts of MsgA contents of two-step random access respectively to avoid the interference to other terminals as far as possible.

Description

A random access method, terminal and network side equipment

technical field

The present invention relates to the technical field of wireless communication, in particular to a random access method, terminal and network side equipment.

Background technique

According to the current standardization progress of the Third Generation Partnership Projects (Third Generation Partnership Projects, 3GPP for short), the random access process in the fifth-generation mobile communication technology-New Radio (5th-Generation New Radio, 5GNR for short) is divided into contention-based Contention-based Random Access (CBRA for short) and Contention-free Random Access (CFRA for short), the terminal (User Equipment, UE for short) first sends the first message (Msg1 ), that is (preamble), and then the base station replies to the UE with the second message (Msg2), in the control unit of the media access control layer of Msg2 (referred to as MAC CE (MAC: MediaAccess Control; CE: Control Element)) It includes a timing adjustment command (Timing AdvanceCommand), and the UE can perform uplink synchronization according to this value.

At present, two-step random access (2-step RACH) has been defined. In 2-step RACH, the traditional first message (Msg1) and third message (Msg3) are combined into message A (MsgA) and reported together. For the base station, the traditional second message (Msg2) and fourth message (Msg4) are combined into message B (MsgB) and sent to the UE together by the base station. That is to say, in 2-step RACH, traditional Msg2 is sent to UE only in MsgB, then MsgA can only be sent to the base station without Timing Advance (TA for short), and uplink synchronization cannot be guaranteed. It may cause interference to other UEs.

Contents of the invention

In view of this, the present invention provides a random access method, terminal and network side equipment, which are used to solve the problem that the terminal sends the first message MsgA without TA in the current two-step random access process. The problem of interference.

In order to solve the above technical problems, in the first aspect, the present invention provides a random access method applied to a terminal, including:

sending random access information, the random access information includes first content and second content, the first content includes a random access preamble, the second content includes random access related data, and the first A first guard interval is set after the symbol where the content is located, and a second guard interval is set after the symbol where the second content is located.

Preferably, before the step of sending random access information, it also includes:

Obtain downlink synchronization information;

Determine the first guard interval and the second guard interval according to the downlink synchronization information.

Preferably, the step of acquiring downlink synchronization information includes:

Acquiring the first time domain position that the terminal believes can receive the broadcast message sent by the network side device;

Acquiring the second time domain position at which the broadcast message sent by the network side device is actually received;

Determine the downlink synchronization information according to the first time domain position and the second time domain position.

Preferably, the step of determining the first guard interval and the second guard interval according to the downlink synchronization information includes:

Selecting values of the first guard interval and the second guard interval within the range of cell-level guard intervals according to the downlink synchronization information.

Preferably, the first guard interval and the second guard interval are equal.

In the second aspect, the present invention also provides a random access method applied to network side equipment, including:

receiving random access information, the random access information includes first content and second content, the first content includes a random access preamble, the second content includes data related to random access, and the first A first guard interval is set after the symbol where the content is located, and a second guard interval is set after the symbol where the second content is located.

Preferably, after the step of receiving random access information, it further includes:

If the first guard interval and the second guard interval are equal, determine that the first content and the second content come from a same terminal.

In a third aspect, the present invention also provides a terminal, including:

A transceiver, configured to send random access information, where the random access information includes first content and second content, the first content includes a random access preamble, and the second content includes random access-related data , a first guard interval is set after the symbol of the first content, and a second guard interval is set after the symbol of the second content.

Preferably, the terminal also includes:

A processor, configured to acquire downlink synchronization information; and determine the first guard interval and the second guard interval according to the downlink synchronization information.

Preferably, the processor is further configured to obtain a first time domain position at which the terminal believes that it can receive the broadcast message sent by the network side device; obtain a second time domain position at which the broadcast message sent by the network side device is actually received; Determine the downlink synchronization information according to the first time domain position and the second time domain position.

Preferably, the processor is further configured to select values of the first guard interval and the second guard interval within the range of cell-level guard intervals according to the downlink synchronization information.

Preferably, the first guard interval and the second guard interval are equal.

In a fourth aspect, the present invention also provides a network side device, including:

A transceiver, configured to receive random access information, where the random access information includes first content and second content, the first content includes a random access preamble, and the second content includes random access-related data , a first guard interval is set after the symbol of the first content, and a second guard interval is set after the symbol of the second content.

Preferably, the network side device also includes:

A processor, configured to determine that the first content and the second content come from the same terminal if the first guard interval is equal to the second guard interval.

In the fifth aspect, the present invention also provides a terminal, including a memory, a processor, and a computer program stored on the memory and operable on the processor; when the processor executes the computer program, any of the above-mentioned tasks can be realized. A random access method applied to a terminal.

In the sixth aspect, the present invention also provides a network side device, including a memory, a processor, and a computer program stored on the memory and operable on the processor; when the processor executes the computer program, the Any one of the above random access methods is applied to the network side device.

In a seventh aspect, the present invention further provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the steps in any one of the above random access methods are implemented.

The beneficial effects of above-mentioned technical scheme of the present invention are as follows:

In the embodiment of the present invention, when the terminal sends the first message (MsgA) in the two-step random access process, a guard interval is respectively added after the two parts of MsgA (the first content and the second content), so as to Avoid interference with other terminals as much as possible.

Description of drawings

FIG. 1 is a schematic flowchart of a random access method in Embodiment 1 of the present invention;

FIG. 2 is a schematic flowchart of a method for determining the first guard interval and the second guard interval in Embodiment 1 of the present invention;

FIG. 3 is a schematic flowchart of a random access method in Embodiment 2 of the present invention;

FIG. 4 is a schematic flowchart of another random access method in Embodiment 2 of the present invention;

FIG. 5 is a schematic structural diagram of a terminal in Embodiment 3 of the present invention;

FIG. 6 is a schematic structural diagram of a network side device in Embodiment 4 of the present invention;

FIG. 7 is a schematic structural diagram of a terminal in Embodiment 5 of the present invention;

FIG. 8 is a schematic structural diagram of a network side device in Embodiment 6 of the present invention.

detailed description

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the following will clearly and completely describe the technical solutions of the embodiments of the present invention in conjunction with the drawings of the embodiments of the present invention. Apparently, the described embodiments are some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention belong to the protection scope of the present invention.

Please refer to FIG. 1. FIG. 1 is a schematic flowchart of a random access method provided in Embodiment 1 of the present invention. The method is applied to a terminal and includes the following steps:

Step 11: The terminal sends random access information, the random access information includes first content and second content, the first content includes a random access preamble, and the second content includes random access related For data, a first guard interval (guard time, GT for short) is set after the symbol of the first content, and a second guard interval is set after the symbol of the second content.

It should be noted that the first content is a signal for detecting the UE (a signal to detect the UE), the second content is a data part (a payload), and the second content is on a physical uplink shared channel (PhysicalUplink Shared Channel, PUSCH for short). Wherein, the second content includes at least Msg3 in traditional contention-based random access, and the Msg3 contains different content in different random access scenarios.

In the embodiment of the present invention, when the terminal sends the first message (MsgA) in the two-step random access process, a guard interval is added after the two parts of MsgA to avoid interference to other terminals as much as possible.

The above random access method is illustrated below with an example.

Optionally, before the step of sending random access information, it also includes:

The terminal acquires downlink synchronization information;

The terminal determines the first guard interval and the second guard interval according to the downlink synchronization information.

In the embodiment of the present invention, before sending the random access information, since the terminal does not send a message to the network side equipment (such as a base station), and the network side equipment does not send a message to the terminal, the terminal cannot obtain the TA, so the terminal can only base on the downlink synchronization information To estimate the length of the guard interval, and then add the estimated guard interval after the two parts of the random access message, so as to avoid interference to other terminals as much as possible.

Further optionally, the step of obtaining downlink synchronization information includes:

The terminal obtains the first time domain position that it believes can receive the broadcast message sent by the network side device;

The terminal acquires the second time domain position at which the broadcast message sent by the network side device is actually received;

Determine the downlink synchronization information according to the first time domain position and the second time domain position.

It should be noted that, theoretically, the terminal should know the period information of the broadcast message sent by the network-side device, but due to some reasons, such as clock accuracy problems, the terminal may think that the broadcast message sent by the network-side device There is a deviation between the time domain position and the time domain position where the network side device actually sends the broadcast message.

In the embodiment of the present invention, since there is a certain physical distance between the terminal and the network side device, there is a transmission delay when electromagnetic waves are transmitted from one side to the other side. Therefore, there is a time difference between the first time domain position where the terminal believes that the network side device broadcast message should be received and the second time domain position where the terminal actually receives the network side device broadcast message, that is, the downlink synchronization information.

Optionally, the step of determining the first guard interval and the second guard interval according to the downlink synchronization information includes:

The terminal selects values of the first guard time and the second guard time within the range of a cell-specific guard time according to the downlink synchronization information.

That is, in the embodiment of the present invention, after the terminal estimates the downlink synchronization information, it directly selects the first guard interval and the Describe the value of the second guard interval.

It should be noted that the cell-level guard interval may be a traditional random access preamble guard interval, and its length depends on the coverage radius of the cell, and is generally set as the time required for signal transmission twice the distance of the cell radius. However, the size range of the radius of the conventional cell has a consensus in the field.

For example, FIG. 2 shows a method for determining the first guard interval and the second guard interval, and the specific process is as follows:

Step 21: The terminal obtains the time t ₁ when it thinks it should receive the broadcast message sent by the base station, that is, the terminal thinks that the base station sends the broadcast message at time t ₁ ;

Step 22: The terminal obtains the time t ₂ when it actually receives the broadcast message from the base station;

Step 23: The terminal calculates the downlink time difference (that is, the downlink synchronization information) △=|t ₁ -t ₂ |;

Step 24: The terminal randomly selects one or two values within the range of the conventionally calculated cell-level guard interval according to the downlink time difference Δ as the values of the first guard interval and the second guard interval, respectively.

Optionally, the first guard interval is equal to the second guard interval.

In the two-step random access process, the first content and the second content in the first message MsgA are sent to the network side device separately, for example, the first content is on the physical random access channel (Physical Random Access Channel, PRACH for short) The second content is sent on a Physical Uplink Shared Channel (PUSCH for short), and the network side device cannot effectively distinguish which terminal the received second content belongs to. Therefore, in the embodiment of the present invention, a terminal-level guard interval (UE-specific guard time) pair (GT pair) is designed for the first content and the second content, that is, the above-mentioned first guard interval and the second guard interval are equal value, so that after receiving the first content and the second content, the network side device can identify which terminal the second content belongs to by comparing whether the guard intervals of the two are consistent, and make a corresponding response.

Please refer to FIG. 3. FIG. 3 is a schematic flowchart of a random access method provided in Embodiment 2 of the present invention. The method is applied to a network side device and includes the following steps:

Step 31: The network side device receives random access information, the random access information includes first content and second content, the first content includes a random access preamble, and the second content includes a random access For related data, a first guard interval is set after the symbol of the first content, and a second guard interval is set after the symbol of the second content.

Wherein, the network side device may be a base station.

It should be noted that the first content is a signal for detecting the UE (a signal to detect the UE), and the second content is a data part (a payload). Wherein, the second content may include Msg3 in traditional contention-based random access, and the Msg3 contains different content in different random access scenarios.

In the embodiment of the present invention, when the terminal sends the first message (MsgA) in the two-step random access process, a guard interval is added after the two parts of MsgA to avoid interference to other terminals as much as possible, so that the network A first guard interval is set after the first content received by the side device, and a second guard interval is set after the second content.

Optionally, after the step of receiving random access information, it also includes:

If the first guard interval and the second guard interval are equal, the network side device determines that the first content and the second content come from a same terminal.

In the two-step random access process, the terminal sends the first content and the second content in the first message MsgA to the network side device separately, for example, the first content is sent on the PRACH, and the second content is sent on the PUSCH , the network side device cannot effectively distinguish which terminal the received second content belongs to. Therefore, in the embodiment of the present invention, the terminal designs a terminal-level guard time (UE-specific guard time) pair (GT pair) for the first content and the second content, that is, the above-mentioned first guard time and second The guard interval takes the same value, so that after receiving the first content and the second content, the network side device can identify which terminal the second content belongs to by comparing whether the guard intervals of the two are consistent, and make a corresponding response.

For example, FIG. 4 shows a random access method applied to a base station, which specifically includes the following steps:

Step 41: The base station detects the first content and the second content sent by the terminal within a certain period of time (here, there is no limit to the waiting time of the base station, which can be determined according to actual requirements). If it is detected that the first content and the second content carrying the same guard interval are detected, then step 41 is performed; if only the first content or only the second content is detected, then step 42 is performed; if neither the first content is detected If the second content is not detected, that is, no message from the terminal is detected, then go to step 43 .

Step 42: The base station considers that the first content and the second content in the MsgA of the same terminal have been received, and makes a corresponding response according to the decoded information.

Step 43: The base station decodes the received first content or second content, and makes a corresponding response.

Step 44: Do nothing.

The embodiment of the present invention provides a technical solution corresponding to the above-mentioned embodiment 1 and having the same inventive concept, and can achieve the same technical effect. For details, please refer to the above-mentioned embodiment 1, which will not be repeated here.

Please refer to FIG. 5. FIG. 5 is a schematic structural diagram of a terminal provided in Embodiment 3 of the present invention. The terminal 50 includes:

A transceiver 51, configured to send random access information, where the random access information includes first content and second content, the first content includes a random access preamble, and the second content includes random access related For data, a first guard interval is set after the symbol of the first content, and a second guard interval is set after the symbol of the second content.

In the embodiment of the present invention, when the terminal sends the first message (MsgA) in the two-step random access process, a guard interval is respectively added after the two parts of MsgA (the first content and the second content), so as to Avoid interference with other terminals as much as possible.

Optionally, the terminal also includes:

A processor, configured to acquire downlink synchronization information; and determine the first guard interval and the second guard interval according to the downlink synchronization information.

Optionally, the processor is further configured to obtain a first time domain position at which the terminal believes that the broadcast message sent by the network side device can be received; obtain a second time domain position at which the broadcast message sent by the network side device is actually received ; Determine the downlink synchronization information according to the first time domain position and the second time domain position.

Optionally, the processor is further configured to select values of the first guard interval and the second guard interval within the range of a cell-level guard interval according to the downlink synchronization information.

Optionally, the first guard interval is equal to the second guard interval.

The embodiment of the present invention is a product embodiment corresponding to the first method embodiment above, so details are not repeated here, please refer to the first embodiment above for details.

Please refer to FIG. 6. FIG. 6 is a schematic structural diagram of a network-side device provided in Embodiment 4 of the present invention. The network-side device 60 includes:

A transceiver 61, configured to receive random access information, where the random access information includes first content and second content, the first content includes a random access preamble, and the second content includes random access related For data, a first guard interval is set after the symbol of the first content, and a second guard interval is set after the symbol of the second content.

In the embodiment of the present invention, when the terminal sends the first message (MsgA) in the two-step random access process, a guard interval is added after the two parts of MsgA to avoid interference to other terminals as much as possible, so that the network A first guard interval is set after the first content received by the side device, and a second guard interval is set after the second content.

Optionally, the network side device also includes:

A processor, configured to determine that the first content and the second content come from the same terminal if the first guard interval is equal to the second guard interval.

The embodiment of the present invention is a product embodiment corresponding to the second method embodiment above, so details will not be repeated here, please refer to the second embodiment above for details.

Please refer to FIG. 7. FIG. 7 is a schematic structural diagram of a terminal provided in Embodiment 5 of the present invention. The terminal 70 includes a processor 71, a memory 72, and a A computer program; the processor 71 implements the following steps when executing the computer program:

sending random access information, the random access information includes first content and second content, the first content includes a random access preamble, the second content includes random access related data, and the first A first guard interval is set after the symbol where the content is located, and a second guard interval is set after the symbol where the second content is located.

In the embodiment of the present invention, when the terminal sends the first message (MsgA) in the two-step random access process, a guard interval is respectively added after the two parts of MsgA (the first content and the second content), so as to Avoid interference with other terminals as much as possible.

Optionally, the processor 71 may also implement the following steps when executing the computer program:

Before the step of sending random access information, it also includes:

Obtain downlink synchronization information;

Determine the first guard interval and the second guard interval according to the downlink synchronization information.

Optionally, the processor 71 may also implement the following steps when executing the computer program:

The step of obtaining downlink synchronization information includes:

Acquiring the first time domain position that the terminal believes can receive the broadcast message sent by the network side device;

Acquiring the second time domain position at which the broadcast message sent by the network side device is actually received;

Determine the downlink synchronization information according to the first time domain position and the second time domain position.

Optionally, the processor 71 may also implement the following steps when executing the computer program:

The step of determining the first guard interval and the second guard interval according to the downlink synchronization information includes:

Selecting values of the first guard interval and the second guard interval within the range of cell-level guard intervals according to the downlink synchronization information.

Optionally, the first guard interval is equal to the second guard interval.

The specific working process of the embodiment of the present invention is consistent with that in the first method embodiment above, so it will not be repeated here. For details, please refer to the description of the method steps in the first embodiment above.

Please refer to FIG. 8. FIG. 8 is a schematic structural diagram of a network-side device provided in Embodiment 6 of the present invention. The network-side device 80 includes a processor 81, a memory 82 and a A computer program running on the processor 81; when the processor 81 executes the computer program, the following steps are realized:

receiving random access information, where the random access information includes first content and second content, the first content includes a random access preamble, the second content includes data related to random access, and the first A first guard interval is set after the symbol where the content is located, and a second guard interval is set after the symbol where the second content is located.

In the embodiment of the present invention, when the terminal sends the first message (MsgA) in the two-step random access process, a guard interval is added after the two parts of MsgA to avoid interference to other terminals as much as possible, so that the network A first guard interval is set after the first content received by the side device, and a second guard interval is set after the second content.

Optionally, when the processor 81 executes the computer program, the following steps can also be implemented:

After the step of receiving random access information, it also includes:

If the first guard interval and the second guard interval are equal, determine that the first content and the second content come from a same terminal.

The specific working process of the embodiment of the present invention is consistent with that in the second embodiment of the above method, so it will not be repeated here. For details, please refer to the description of the method steps in the second embodiment above.

Embodiment 7 of the present invention provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps in any random access method in Embodiment 1 or Embodiment 2 above are implemented. For details, please refer to the description of the method steps in the above corresponding embodiments.

The network side device in the embodiment of the present invention may be a Base Transceiver Station (BTS for short) in Global System of Mobile communication (GSM for short) or Code Division Multiple Access (CDMA for short), or It can be a base station (NodeB, NB for short) in Wideband Code Division Multiple Access (WCDMA for short), or an evolved base station (Evolutional Node B, eNB or eNodeB for short) in LTE, or a relay station or a relay station. The entry point, or the base station in the future 5G network, etc., is not limited here.

The terminal in the embodiment of the present invention can be a wireless terminal or a wired terminal. The wireless terminal can be a device that provides voice and/or other service data connectivity to the user, a handheld device with a wireless connection function, or a wireless modem other processing equipment. The wireless terminal can communicate with one or more core networks via the Radio Access Network (RAN for short), and the wireless terminal can be a mobile terminal, such as a mobile phone (or called a "cellular" phone) and a mobile phone with a mobile terminal. Computers, for example, may be portable, pocket, handheld, built-in, or vehicle-mounted mobile devices that exchange voice and/or data with the radio access network. For example, a Personal Communication Service (PCS for short) phone, a cordless phone, a Session Initiation Protocol (SIP for short) phone, a Wireless Local Loop (WLL for short) station, a Personal Digital Assistant (PDA) Assistant, referred to as PDA) and other devices. The wireless terminal can also be called a system, a subscriber unit (Subscriber Unit), a subscriber station (Subscriber Station), a mobile station (MobileStation), a mobile station (Mobile), a remote station (Remote Station), a remote terminal (Remote Terminal), access A terminal (Access Terminal), a user terminal (User Terminal), a user agent (User Agent), and a terminal (UserDevice or User Equipment) are not limited herein.

The above computer-readable storage media include permanent and non-permanent, removable and non-removable media, and information storage can be realized by any method or technology. Information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read only memory (ROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Flash memory or other memory technology, Compact Disc Read-Only Memory (CD-ROM), Digital Versatile Disc (DVD) or other optical storage, Magnetic tape cartridge, tape magnetic disk storage or other magnetic storage device or any other non-transmission medium that can be used to store information that can be accessed by a computing device.

The above description is a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications can also be made. It should be regarded as the protection scope of the present invention.

Claims (13)

1. A random access method applied to a terminal is characterized by comprising the following steps:

sending random access information, wherein the random access information comprises first content and second content, the first content comprises a random access lead code, the second content comprises data related to random access, a first protection interval is arranged behind a symbol where the first content is located, and a second protection interval is arranged behind a symbol where the second content is located;

before the step of sending the random access information, the method further comprises:

acquiring downlink synchronous information;

determining the first guard interval and the second guard interval according to the downlink synchronization information;

the step of determining the first guard interval and the second guard interval according to the downlink synchronization information includes:

and selecting the values of the first protection interval and the second protection interval within the range of the cell-level protection interval according to the downlink synchronization information.

2. The method of claim 1, wherein the step of acquiring the downlink synchronization information comprises:

acquiring a first time domain position which is considered by the terminal to be capable of receiving a broadcast message sent by network side equipment;

acquiring a second time domain position of a broadcast message actually received from network side equipment;

and determining the downlink synchronization information according to the first time domain position and the second time domain position.

3. The method of claim 1, wherein the first guard interval and the second guard interval are equal.

4. A random access method is applied to network side equipment, and is characterized by comprising the following steps:

receiving random access information, wherein the random access information comprises first content and second content, the first content comprises a random access lead code, the second content comprises data related to random access, a first protection interval is arranged behind a symbol where the first content is located, and a second protection interval is arranged behind a symbol where the second content is located;

wherein the determining, by the terminal according to the downlink synchronization information, the first guard interval and the second guard interval include: and selecting the values of the first protection interval and the second protection interval within the range of the cell-level protection interval according to the downlink synchronization information.

5. The method of claim 4, wherein the step of receiving the random access information is followed by:

and if the first protection interval is equal to the second protection interval, determining that the first content and the second content come from the same terminal.

6. A terminal, comprising:

a transceiver, configured to send random access information, where the random access information includes a first content and a second content, the first content includes a random access preamble, the second content includes data related to random access, a first guard interval is set behind a symbol where the first content is located, and a second guard interval is set behind a symbol where the second content is located;

a processor, configured to acquire downlink synchronization information; determining the first guard interval and the second guard interval according to the downlink synchronization information;

the processor is further configured to select values of the first guard interval and the second guard interval within a range of a cell-level guard interval according to the downlink synchronization information.

7. The terminal of claim 6, wherein the processor is further configured to obtain a first time domain location where the terminal considers that a broadcast message sent by a network-side device can be received; acquiring a second time domain position of a broadcast message actually received from network side equipment; and determining the downlink synchronization information according to the first time domain position and the second time domain position.

8. The terminal of claim 6, wherein the first guard interval and the second guard interval are equal.

9. A network-side device, comprising:

a transceiver, configured to receive random access information, where the random access information includes a first content and a second content, the first content includes a random access preamble, the second content includes data related to random access, a first guard interval is set behind a symbol where the first content is located, and a second guard interval is set behind a symbol where the second content is located; wherein the determining, by the terminal according to the downlink synchronization information, the first guard interval and the second guard interval include: and selecting the values of the first protection interval and the second protection interval within the range of the cell-level protection interval according to the downlink synchronization information.

10. The network-side device of claim 9, further comprising:

a processor, configured to determine that the first content and the second content are from a same terminal if the first guard interval and the second guard interval are equal.

11. A terminal comprising a memory, a processor and a computer program stored on the memory and executable on the processor; characterized in that the processor implements the random access method according to any of claims 1 to 3 when executing the computer program.

12. A network-side device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor; characterized in that the processor realizes the random access method according to claim 4 or 5 when executing the computer program.

13. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the random access method according to any one of claims 1 to 5.

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