CN112970320B - Random access method, base station, terminal and channel structure - Google Patents

Abstract

The embodiment of the invention discloses a random access method, a base station, a terminal and a channel structure, wherein the method comprises the following steps: a base station sends a first signaling, wherein the first signaling contains length indication information of a guard time interval GT in a first message for random access; the first message comprises a preamble and a physical uplink shared channel, PUSCH, for carrying uplink data, and a GT located between the preamble and the PUSCH. By adopting the embodiment of the invention, the time delay requirement of the terminal random access can be met, and the working efficiency of the system is improved.

Description

A random access method, base station, terminal and channel structure

technical field

The present invention relates to the field of communication technology, in particular to a random access method, base station, terminal and channel structure.

Background technique

The random access process refers to the process from when the user sends a random access preamble to try to access the network to when a basic signaling connection is established with the network. Existing conventional random access generally adopts a four-step access method that is completed through message interaction of msg1-msg4 between the terminal and the base station.

In order to shorten the time delay of the random access process, it is currently being considered to compress the existing four-step access method into a two-step access method. The terminal sends msgA, and the base station responds with msgB. msgA may include a preamble and an uplink data part, and the uplink data part may be carried by a Physical uplink shared channel (PUSCH for short), but the guard time interval (guard time, short for PUSCH) between the preamble and the PUSCH carrying uplink data GT) has no clear standard description.

Contents of the invention

Embodiments of the present invention provide a random access method, base station, terminal, and channel structure, which can maintain a reasonable GT between the preamble in the message for random access and PUSCH, and meet the time requirements for random access of the terminal. Delay demand, improve system efficiency.

The first aspect of the embodiments of the present invention provides a random access method, including:

The base station sends first signaling, where the first signaling includes indication information of the length of the guard time interval GT in the first message for random access;

The first message includes a preamble, a physical uplink shared channel PUSCH for carrying uplink data, and a GT located between the preamble and the PUSCH.

The second aspect of the embodiment of the present invention provides a random access method, including:

The terminal obtains the length indication information of the guard time interval GT in the first message for random access;

The first message includes a preamble, a physical uplink shared channel PUSCH for carrying uplink data, and a GT located between the preamble and the PUSCH.

A third aspect of the embodiments of the present invention provides a base station, including:

A transceiver unit, configured to send first signaling, where the first signaling includes indication information of the length of the guard time interval GT in the first message for random access;

The first message includes a preamble, a physical uplink shared channel PUSCH for carrying uplink data, and a GT located between the preamble and the PUSCH.

A fourth aspect of the embodiments of the present invention provides a base station, which may include:

A processor, a memory, and a bus, the processor and the memory are connected through a bus, wherein the memory is used to store a set of program codes, and the processor is used to call the program codes stored in the memory to execute the embodiments of the present invention The first aspect or a step in any implementation manner of the first aspect.

A fifth aspect of the embodiments of the present invention provides a computer storage medium, where the computer storage medium includes a set of program codes for executing the method described in any implementation manner of the first aspect of the embodiments of the present invention.

A sixth aspect of the embodiments of the present invention provides a terminal, which may include:

A transceiver unit, configured to acquire length indication information of a guard time interval GT in the first message for random access;

The first message includes a preamble, a physical uplink shared channel PUSCH for carrying uplink data, and a GT located between the preamble and the PUSCH.

The seventh aspect of the embodiment of the present invention provides a terminal, which may include:

A processor, a memory, and a bus, the processor and the memory are connected through a bus, wherein the memory is used to store a set of program codes, and the processor is used to call the program codes stored in the memory to execute the embodiments of the present invention The second aspect or a step in any implementation manner of the second aspect.

The eighth aspect of the embodiments of the present invention provides a computer storage medium, where the computer storage medium includes a set of program codes for executing the method described in any implementation manner of the second aspect of the embodiments of the present invention.

A ninth aspect of the embodiment of the present invention provides a channel structure for random access, including:

A preamble, a physical uplink shared channel PUSCH, and a guard time interval GT between the preamble and the physical uplink shared channel;

The length of the GT is less than or equal to a preset threshold.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required in the embodiments. Obviously, the accompanying drawings in the following description are only some of the present invention. Embodiments, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without any creative effort.

FIG. 1 is a schematic diagram of the architecture of a communication system in an embodiment of the present invention;

FIG. 2 is a schematic flowchart of a random access method provided by an embodiment of the present invention;

FIG. 3 is a schematic composition diagram of a channel structure provided by an embodiment of the present invention;

FIG. 4 is a schematic flowchart of another random access method provided by an embodiment of the present invention;

FIG. 5 is a schematic flowchart of another random access method provided by an embodiment of the present invention;

FIG. 6 is a schematic composition diagram of another channel structure provided by an embodiment of the present invention;

FIG. 7 is a schematic composition diagram of another channel structure provided by an embodiment of the present invention;

FIG. 8 is a schematic composition diagram of another channel structure provided by an embodiment of the present invention;

FIG. 9 is a schematic composition diagram of a base station provided by an embodiment of the present invention;

FIG. 10 is a schematic composition diagram of another base station provided by an embodiment of the present invention;

FIG. 11 is a schematic diagram of the composition of a terminal provided by an embodiment of the present invention;

Fig. 12 is a schematic composition diagram of another terminal provided by an embodiment of the present invention.

Detailed ways

The terms "comprising" and "having" and any variations thereof in the description and claims of the present invention and the above drawings are intended to cover a non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units not listed, or optionally further includes other steps or units inherent in these processes, methods, products or apparatus.

With the continuous improvement of people's communication needs, communication technology is developing rapidly. After the cell search process, the UE has achieved downlink synchronization with the cell, so the terminal can receive downlink data. However, the terminal can perform uplink transmission only when it obtains uplink synchronization with the cell. The terminal establishes a connection with the cell through a random access procedure (Random Access Procedure) and obtains uplink synchronization. The main purpose of the random access includes: (1) obtaining uplink synchronization; (2) assigning a unique Cell Radio Network Temporary Identifier (C-RNTI) to the terminal. The base station and the terminal can complete random access through msg1-msg4: msg1, the terminal sends a random access preamble (preamble); msg2, the base station sends a random access response message; msg3, the terminal sends msg3, and the content of msg3 is consistent with the random access message. For example, the content of msg3 is a Radio Resource Control (RRC) connection request during initial access, and the content of msg3 is an RRC connection reestablishment request during connection reestablishment; msg4, the base station sends a conflict resolution message . Thus, the random access process is completed.

Since users hope to obtain lower and lower random access delays, the two-step access method using msgA-msgB interaction can be used instead of the existing four-step access method using msg1-msg4 interaction. The terminal sends msgA, and the base station responds with msgB. msgA can also be called the first message of random access, which can include a preamble and an uplink data part, wherein the uplink data part can be used to carry the identification information of the terminal and the reason for the RRC request (basically equivalent to the content contained in the existing msg3 ); msgB may also be called the second message of random access, which may include conflict resolution information, timing advance (Timing Advance, TA for short) information, C-RNTI allocation information, etc. (basically equivalent to the existing information contained in msg2 and msg4). When this two-step access method is applied to a new air interface (NR in Unlicensed Spectrum, NR-U) system working on an unlicensed spectrum, since NR-U, a system that works on an unlicensed spectrum, the Between, even with different system (such as WIFI) devices, it is necessary to share the unlicensed spectrum through channel preemption. Therefore, the device needs to listen to the channel before sending the signal, and then send the signal after confirming that the channel is free. This mechanism is called For listen before talk (LBT for short), in order to improve the efficiency of the system, it is necessary to reduce the number of times of LBT when the terminal randomly accesses. The length of the guard time (GT for short) between the preamble (preamble) and the PUSCH is uncertain, which makes it impossible for the terminal to achieve fast random access. Therefore, it is necessary to provide a method that enables a terminal to implement fast random access in this type of system.

For ease of description, the 5G system is used for description in the embodiment of the present invention. Those skilled in the art should understand that the implementation in the embodiment of the present invention is also applicable to existing communication systems and future higher-level communications such as 6G and 7G system, the embodiment of the present invention does not make any limitation.

The method and device for random access in the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Please refer to FIG. 1 , which is a schematic diagram of an architecture of a communication system in an embodiment of the present invention. It may include a base station and at least one terminal, and the terminal may also be called user equipment (User Equipment, UE).

Wherein, the base station may be an evolved Node B (evolved Node B, referred to as eNB), Node B (Node B, referred to as NB), a Base Station Controller (Base Station Controller, referred to as BSC), a Base Transceiver Station (Base TransceiverStation, referred to as BTS) , a home base station (for example, Home evolved NodeB, or Home Node B, HNB for short), a baseband unit (BaseBand Unit, BBU for short), and the like. It may also be called a base station transceiver, a wireless base station, a wireless transceiver, a transceiver function, a base station subsystem (Base Station Sub system, BSS for short) or some other appropriate terms by those skilled in the art. It can determine the length of GT and notify the terminal of the length of GT.

Wherein, the terminal may include a cellular phone, a smart phone, a Session Initiation Protocol (Session Initiation Protocol, SIP for short) phone, a laptop computer, a Personal Digital Assistant (PDA for short), a satellite radio, a global positioning system, a multimedia device, Video equipment, digital audio player (eg, MP3 player), camera, game console, or any other similarly functional device. A terminal may also be referred to by those skilled in the art as a mobile station, subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile Terminal, wireless terminal, remote terminal, handheld device, user agent, mobile client, client, or some other appropriate term. It can obtain the length of the GT, and based on the length of the GT, construct a first message and send it to the base station, so as to realize fast random access.

Please refer to FIG. 2, which is a schematic flowchart of a random access method provided by an embodiment of the present invention; in this embodiment, the method includes the following steps:

S201. The base station determines the length of GT in the first message used for random access.

Wherein, the first message includes a preamble, a physical uplink shared channel PUSCH for carrying uplink data, and a GT located between the preamble and the PUSCH.

Optionally, the length of the GT is less than or equal to a preset threshold.

The preset threshold may be determined based on the currently working communication system and/or the access delay requirement of the terminal. For example, when it is applied in the NR-U system, the terminal hopes to have a low access delay, and the access can be completed by using a single LBT, then the preset threshold at this time can be set to 16 microseconds.

When the length of GT is less than or equal to 16 microseconds, based on the usage rules of unlicensed spectrum, when the interval between two transmissions of the terminal is less than 16 microseconds, there is no need to perform LBT before the second transmission, so it can be significantly improved Terminal access efficiency.

Optionally, the length of the GT is greater than or equal to the maximum round-trip delay of the cell.

Since there may be one or more terminals within the range of the cell, the length of the GT may be greater than or equal to the maximum round-trip delay (Round-Trip Time, RTT) determined based on the radius of the cell, and the maximum round-trip delay may be used to characterize the The round-trip delay between the edge terminal and the base station. It can be determined by dividing the cell radius by the speed of light and then multiplying by 2. If the cell radius is R meters, then RTT=2*R/c, where c represents the speed of light. Based on this formula, if the cell radius is 1.25 kilometers, then RTT=8.33 microseconds.

When applied to other scenarios or systems, the size of the preset threshold can be flexibly set.

When the base station determines the length of the GT, it can be determined in any of the following ways:

1) Use the preset length as the GT length. The base station may select a preset length pre-agreed with the terminal as the GT length, for example, it is pre-agreed that GT=16 microseconds or GT=8 microseconds or GT is equal to 0 microseconds. It should be noted that when the GT is equal to 0 microseconds, it means that the length of the cyclic prefix of the PUSCH symbols in the PUSCH is sufficient to be used as a guard time, so the GT can be configured as 0 microseconds.

2) The base station determines the length of the GT according to the current working frequency band, and the working frequency band has a corresponding relationship with the length of the GT. For example, for the NR-U system working in the low frequency band FR1, GT=16 microseconds; for the NR-U system working in the high frequency band FR2, GT=8 microseconds.

3) The base station determines the length of the GT according to the length of the preamble and the symbol length of the PUSCH. If the length of the preamble is greater than the length of n PUSCH symbols and less than the length of (n+1) PUSCH symbols, and the difference between the length of (n+1) PUSCH symbols and the length of the preamble is not greater than 16 microseconds, then you can The length of the GT is defined as the length of (n+1) PUSCH symbols minus the length of the preamble. When the above conditions are not met, you can configure GT=16us, or other agreed lengths.

What needs to be explained here is that the PUSCH in msgA can use different subcarrier spacing (SCS for short), for example, the low frequency band FR1, PUSCH can use 15KHz, 30KHz SCS; the high frequency band FR2, PUSCH can use 120KHz, 240KHz SCS .

After the length of GT is determined, the channel structure for random access is determined. For details, refer to FIG. 3 , which is a schematic composition diagram of a channel structure provided by an embodiment of the present invention. As shown in Figure 3, the channel structure contains:

A preamble, a physical uplink shared channel PUSCH, and a guard time interval GT between the preamble and the physical uplink shared channel;

The length of the GT is less than or equal to a preset threshold.

The preset threshold may be 16 microseconds or other values.

Further, the length of the GT may also be greater than or equal to the maximum round-trip delay of the cell.

Wherein, in terms of time sequence, the preamble is located before the GT, and the GT is located before the PUSCH. In addition, the preamble may include two parts, a cyclic prefix (Cyclic Prefix, CP for short) and a preamble (preamble) sequence. In addition, the length of the preamble here is greater than 3 PUSCH symbols and less than 4 PUSCH symbols, and the length of the PUSCH is equal to 2 PUSCH symbols. The GT here is the length of 4 PUSCH symbols minus the length of the preamble, and the GT is less than or equal to 16 microseconds.

S202. The base station sends first signaling.

The first signaling includes length indication information of GT in the first message for random access.

After the base station determines the length of the GT, it can notify the terminal.

Optionally, the first signaling may be a broadcast message or radio resource control RRC dedicated signaling.

Optionally, the length indication information is used to indicate the length of the GT;

Alternatively, the length indication information is used to indicate an index value of the GT length, and the index value is used to obtain the GT length from a preset GT length set.

In this way, when the base station notifies the terminal of the length of GT, it can notify the terminal of the specific value of the length, or pre-configure a candidate set of GT length for the terminal, and then notify the terminal of an index value, and the terminal determines the use of the candidate set according to the index value The value of the specific GT.

S203. The base station receives the first message sent by the terminal.

The length of the GT included in the first message is equal to the length of the GT indicated in the length indication information.

Optionally, since the PUSCH needs to perform symbol alignment, the initial gap (GAP) between the preamble and the PUSCH is uncertain, and there may be a situation where the GAP is greater than a preset threshold such as 16 microseconds. At this time, the terminal The initial gap can be filled such that the filled gap has the same length as the GT.

Then, the first message sent at this time may further include a filler signal, where the filler signal is located between the preamble and the PUSCH.

Optionally, the filling signal is part of the preamble and/or the PUSCH. Alternatively, it could be a randomly generated random signal.

The filler signal may be located after the preamble, and the gap between the filler signal and the PUSCH is equal to the length of the GT;

Alternatively, the filler signal may also be located before the PUSCH, and the gap between the filler signal and the preamble is equal to the length of the GT;

Alternatively, the filling signal includes a first filling signal and a second filling signal, the first filling signal is located after the preamble, the second filling signal is located before the PUSCH, and the first filling signal and the The gap between the second padding signals is equal to the length of the GT.

S204. The base station sends a second message to the terminal to complete random access of the terminal.

The second message here is the aforementioned msgB.

It should be noted that, in this embodiment, step S202 may exist and be executed independently, or may be executed sequentially with other steps, which is not limited in this embodiment of the present invention.

By using the method of this embodiment, a reasonable guard time interval (GT) is maintained between the preamble and PUSCH in msgA, thereby satisfying the requirement that the terminal in the NR-U system only uses LBT once when sending msgA, so that GT can meet different The deployment scenario (such as the size of the cell radius), the subcarrier spacing of PUSCH and other requirements. Realize the optimized configuration of GT, improve the work efficiency and performance of the system, and help provide users with a better communication experience.

Please refer to FIG. 4, which is a schematic flowchart of another random access method provided by an embodiment of the present invention; in this embodiment, the method includes the following steps:

S401. The terminal acquires GT length indication information in the first message used for random access.

Wherein, the first message includes a preamble, a physical uplink shared channel PUSCH for carrying uplink data, and a GT located between the preamble and the PUSCH.

Optionally, the length of the GT is less than or equal to a preset threshold.

The preset threshold can be 16 microseconds or other values.

Optionally, the length of the GT is greater than or equal to the maximum round-trip delay of the cell.

Optionally, the terminal acquires the length of the GT, and any of the following methods may be used:

1) The terminal receives the first signaling sent by the base station, where the first signaling includes the length indication information of the GT.

2) The length of the GT is a preset length, and the terminal may select a preset length pre-agreed with the base station as the length of the GT.

3) The length of the GT is related to the current working frequency band of the terminal, and the terminal can determine the length of the GT according to the current working frequency band, and the working frequency band has a corresponding relationship with the length of the GT.

When the terminal itself determines the length of the GT, the implementation method is basically similar to that of the base station, and reference can be made to the description on the side of the base station, which will not be repeated here.

S402. The terminal sends a first message to the base station.

The length of the GT included in the first message is equal to the length of the GT indicated in the length indication information.

S403. The terminal receives the second message sent by the base station, and completes the random access of the terminal.

It should be noted that, in this embodiment, step S402 may exist and be executed independently, or may be executed sequentially with other steps, which is not limited in this embodiment of the present invention.

This embodiment is a description on the terminal side, and for details, refer to the description of the embodiment on the base station side shown in FIG. 2 .

Please refer to FIG. 5 , which is a schematic flow chart of another random access method provided by an embodiment of the present invention. Steps S501 and S401 are the same, and S503-S504 are the same as steps S402-S403 in FIG. 4 , which will not be repeated here. Methods may also include:

S502. The terminal adds a filler signal to an initial gap between the preamble and the PUSCH.

It should be noted that, in this embodiment, steps S501-S502 may exist and be executed independently, or may be executed sequentially with other steps, which are not limited in this embodiment of the present invention.

Since the length of the preamble is not fixed, and PUSCH needs symbol alignment, the initial gap (GAP) between the preamble and PUSCH is uncertain, and there may be situations where the GAP is greater than 16 microseconds. The initial gap between the preamble and the PUSCH is greater than the length of the GT, and at this time, the terminal may fill the initial gap so that the length of the filled gap is the same as that of the GT.

Optionally, the padding signal is part of the preamble and/or the PUSCH. For example, it may be a total of x sampling points in the preamble and/or the PUSCH, where x is an integer greater than 1. The x sampling points described here may be formed by using a total of x sampling points in the preamble, or by using a total of x sampling points in the PUSCH, or by using a and sampling points in the preamble and using b in the PUSCH sampling points are formed, and the sum of a and b is equal to x.

When x sampling points in the preamble are used to form the filling signal, the filling signal can maintain the same peak-to-average ratio characteristic as the preamble. This is beneficial for the terminal to maintain a stable power output when sending the preamble, and will not cause the entire msgA to reduce power transmission due to the excessive peak-to-average ratio of the filling signal, so that when the terminal coverage is limited (for example, when the terminal is located at the edge of the cell), It can transmit with higher transmission power to ensure the performance of network connection. In addition, by filling the sampling points of the preamble carried by the signal, the base station can use the information of the sampling points to improve the detection performance of the preamble.

Similarly, when x sampling points in the PUSCH are used to form the filling signal, the filling signal can maintain the same peak-to-average ratio characteristic as that of the PUSCH. This is beneficial for the terminal to maintain a stable power output when sending the PUSCH in msgA, and will not cause the entire msgA to reduce power transmission due to the excessive peak-to-average ratio of the filling signal, so that when the terminal coverage is limited (for example, when the terminal is located at the edge of the cell ), which can be transmitted at a higher transmission power to ensure network connection performance. In addition, the filling signal carries part of the sampling points of the PUSCH, and the base station can use the information of the sampling points to improve the detection performance of the PSUCH.

Of course, optionally, the filling signal may also be a randomly generated random signal. Therefore, the processing consumption of the terminal is reduced, and the filling efficiency of the terminal is improved.

And the terminal adds a filler signal in the initial gap between the preamble and the PUSCH, which may include:

The terminal adds the filler signal after the preamble, and the gap between the filler signal and the PUSCH is equal to the length of the GT;

Or, the terminal adds the filling signal before the PUSCH, and the gap between the filling signal and the preamble is equal to the length of the GT;

Alternatively, the filling signal includes a first filling signal and a second filling signal, the terminal adds the first filling signal after the preamble, and adds a second filling signal before the PUSCH, the first The gap between the stuffing signal and the second stuffing signal is equal to the length of the GT.

Based on the above three filling methods, different channel structures can be obtained. For the convenience of description, the preset threshold value is 16 microseconds for description below, and the preset threshold value may also be other values, which do not constitute any limitation to the embodiment of the present invention.

Please refer to FIG. 6 , which is a schematic composition diagram of another channel structure provided by an embodiment of the present invention.

The channel structure includes a preamble, a physical uplink shared channel PUSCH, and a guard time interval GT between the preamble and the physical uplink shared channel;

In terms of time sequence, the preamble is located before the GT, and the GT is located before the PUSCH. And the preamble may include two parts, a cyclic prefix (CP) and a preamble sequence. The length of the preamble here is greater than 3 PUSCH symbols and less than 4 PUSCH symbols, and the length of the PUSCH is equal to 2 PUSCH symbols. The GT here is the length of 4 PUSCH symbols minus the length of the preamble, and the initial gap GAP is greater than 16 microseconds. In order to meet the requirement that the GT is less than or equal to 16 microseconds. The first x sampling points of the preamble sequence can be copied and added to the position adjacent to the preamble sequence after the preamble sequence, that is, the slash part at the front end of the preamble sequence in Figure 6 is collected and copied to the position after the preamble sequence The slash part, the slash part after the leading preamble sequence is the padding signal, after padding, the GT meets the requirement of less than or equal to 16 microseconds.

Please refer to FIG. 7 , which is a schematic composition diagram of another channel structure provided by an embodiment of the present invention.

The channel structure includes a preamble, a physical uplink shared channel PUSCH, and a guard time interval GT between the preamble and the physical uplink shared channel;

In terms of time sequence, the preamble is located before the GT, and the GT is located before the PUSCH. And the preamble may include two parts, a cyclic prefix (CP) and a preamble sequence. The length of the preamble here is greater than 3 PUSCH symbols and less than 4 PUSCH symbols, and the length of the PUSCH is equal to 2 PUSCH symbols. The GT here is the length of 4 PUSCH symbols minus the length of the preamble, and the initial gap GAP is greater than 16 microseconds. In order to meet the requirement that the GT is less than or equal to 16 microseconds. You can copy the last x sampling points of PUSCH and add them to the position adjacent to PUSCH before PUSCH, that is, collect the slashed part at the end of PUSCH in Figure 7, copy to the slashed part before PUSCH, and the slashed part before PUSCH is For the padding signal, after padding, make the GT meet the requirement of less than or equal to 16 microseconds.

Please refer to FIG. 8 , which is a schematic composition diagram of another channel structure provided by an embodiment of the present invention.

The channel structure includes a preamble, a physical uplink shared channel PUSCH, and a guard time interval GT between the preamble and the physical uplink shared channel;

In terms of time sequence, the preamble is located before the GT, and the GT is located before the PUSCH. And the preamble may include two parts, a cyclic prefix (CP) and a preamble sequence. The length of the preamble here is greater than 3 PUSCH symbols and less than 4 PUSCH symbols, and the length of the PUSCH is equal to 2 PUSCH symbols. The GT here is the length of 4 PUSCH symbols minus the length of the preamble, and the initial gap GAP is greater than 16 microseconds. In order to meet the requirement that the GT is less than or equal to 16 microseconds. The first a sampling points of the leading preamble sequence can be copied and added to the position adjacent to the leading preamble sequence after the leading preamble sequence, that is, the slash part at the front end of the leading preamble sequence in Figure 8 is collected and copied to the slash after the leading preamble sequence The line part, the slash part after the leading preamble sequence is the padding signal of the first part. In addition, the last b sampling points of PUSCH can be copied and added to the position adjacent to PUSCH before PUSCH, that is, the acquisition in Figure 8 The oblique part at the end of the PUSCH is copied to the oblique part before the PUSCH, and the oblique part before the PUSCH is the padding signal of the second part. After two parts of filling, the GT meets the requirement of less than or equal to 16 microseconds.

By adopting the method of this embodiment, a reasonable guard time interval (GT) is maintained between the preamble and PUSCH in msgA, thereby satisfying the requirement that the terminal in the NR-U system only uses LBT once when sending msgA, so that GT can meet different The deployment scenario (such as the size of the cell radius), the subcarrier spacing of PUSCH and other requirements. In addition, by designing a reasonable filling signal, a reasonable GT size can be realized, while ensuring that the transmission of the filling signal does not affect the transmit power of msgA, ensuring the coverage performance of the network.

Please refer to FIG. 9, which is a schematic diagram of the composition of a base station provided by an embodiment of the present invention; in this embodiment, the base station includes:

The transceiver unit 100 is configured to send first signaling, where the first signaling includes length indication information of a guard time interval GT in a first message for random access;

The first message includes a preamble, a physical uplink shared channel PUSCH for carrying uplink data, and a GT located between the preamble and the PUSCH.

Optionally, the length of the GT is less than or equal to a preset threshold.

Optionally, the preset threshold is 16 microseconds.

Optionally, the length of the GT is greater than or equal to the maximum round-trip delay of the cell.

Optionally, the base station further includes a processing unit 200, and the processing unit 200 is configured to determine the length of the GT according to a current working frequency band.

Optionally, the processing unit 200 is configured to determine the length of the GT according to the length of the preamble and the symbol length of the PUSCH.

Optionally, the processing unit 200 is specifically configured to:

If the length of the preamble is greater than the length of n PUSCH symbols and less than the length of (n+1) PUSCH symbols, the length of the preamble is subtracted from the length of (n+1) PUSCH symbols as the length of the GT.

Optionally, the first signaling is a broadcast message or radio resource control RRC dedicated signaling.

Optionally, the length indication information is used to indicate the length of the GT;

Alternatively, the length indication information is used to indicate an index value of the GT length, and the index value is used to obtain the GT length from a preset GT length set.

Optionally, the transceiver unit 100 is also used for:

receiving the first message sent by the terminal, where the length of the GT included in the first message is equal to the length of the GT indicated in the length indication information.

Optionally, the first message further includes a filling signal, and the filling signal is located between the preamble and the PUSCH.

Optionally, the filling signal is part of the preamble and/or the PUSCH.

Optionally, the filling signal is a randomly generated random signal.

Optionally, the filler signal is located after the preamble, and the gap between the filler signal and the PUSCH is equal to the length of the GT;

Or, the filler signal is located before the PUSCH, and the gap between the filler signal and the preamble is equal to the length of the GT;

Alternatively, the filling signal includes a first filling signal and a second filling signal, the first filling signal is located after the preamble, the second filling signal is located before the PUSCH, and the first filling signal and the The gap between the second padding signals is equal to the length of the GT.

For concepts, explanations, detailed descriptions and other steps related to the technical solutions provided by the embodiments of the present application, please refer to the descriptions of these contents in the foregoing method embodiments, and details are not repeated here.

Please refer to FIG. 10 , which is a schematic composition diagram of another base station provided by the embodiment of the present application; as shown in FIG. 10 , the base station may include a processor 110 , a memory 120 and a bus 130 . The processor 110 and the memory 120 are connected through the bus 130, the memory 120 is used to store instructions, and the processor 110 is used to execute the instructions stored in the memory 120, so as to implement the steps in the method corresponding to FIG. 2 above.

Further, the base station may further include an input port 140 and an output port 150 . Wherein, the processor 110 , the memory 120 , the input port 140 and the output port 150 may be connected through the bus 130 .

The processor 110 is configured to execute the instructions stored in the memory 120 to control the output port 150 to send the first signaling to the terminal, to notify the terminal of the length of GT, and optionally, to control the input port 140 to receive the first message sent by the terminal, Complete the steps performed by the base station in the above method. Wherein, the input port 140 and the output port 150 may be the same or different physical entities. When they are the same physical entity, they can be collectively referred to as input and output ports. The memory 120 can be integrated in the processor 110 , or can be set separately from the processor 110 .

As an implementation manner, the functions of the input port 140 and the output port 150 may be realized by a transceiver circuit or a dedicated chip for transceiver. The processor 110 may be considered to be implemented by a dedicated processing chip, a processing circuit, a processor, or a general-purpose chip.

As another implementation manner, it may be considered to use a general-purpose computer to implement the base station provided in the embodiment of the present application. The program codes to realize the functions of the processor 110, the input port 140 and the output port 150 are stored in the memory, and the general-purpose processor realizes the functions of the processor 110, the input port 140 and the output port 150 by executing the codes in the memory.

For concepts, explanations, detailed descriptions and other steps related to the technical solutions provided by the embodiments of the present application, please refer to the foregoing methods or descriptions of these contents in other embodiments, and details are not repeated here.

Please refer to FIG. 11 , which is a schematic diagram of the composition of a terminal provided by an embodiment of the present invention; in this embodiment, the terminal includes:

The transceiver unit 300 is configured to acquire length indication information of the guard time interval GT in the first message for random access;

The first message includes a preamble, a physical uplink shared channel PUSCH for carrying uplink data, and a GT located between the preamble and the PUSCH.

Optionally, the length of the GT is less than or equal to a preset threshold.

Optionally, the preset threshold is 16 microseconds.

Optionally, the length of the GT is greater than or equal to the maximum round-trip delay of the cell.

Optionally, the transceiving unit 300 is configured to receive first signaling sent by the base station, where the first signaling includes length indication information of the GT.

Optionally, the length indication information is used to indicate the length of the GT;

Alternatively, the length indication information is used to indicate an index value of the GT length, and the index value is used to obtain the GT length from a preset GT length set.

Optionally, the length of the GT is a preset length.

Optionally, the length of the GT is related to the current working frequency band of the terminal.

Optionally, the transceiver unit 300 is also used for:

Sending a first message, where the length of the GT included in the first message is equal to the length of the GT indicated in the length indication information.

Optionally, the terminal further includes a processing unit 400, and the processing unit 400 is configured to:

A filler signal is added in an initial gap between the preamble and the PUSCH.

Optionally, the filling signal is part of the preamble and/or the PUSCH.

Optionally, the filling signal is a randomly generated random signal.

Optionally, the processing unit 400 is specifically configured to:

adding the filling signal after the preamble, and the gap between the filling signal and the PUSCH is equal to the length of the GT;

Or, add the padding signal before the PUSCH, and the gap between the padding signal and the preamble is equal to the length of the GT;

Alternatively, the filling signal includes a first filling signal and a second filling signal, the first filling signal is added after the preamble, and a second filling signal is added before the PUSCH, the first filling signal and The gap between the second filling signals is equal to the length of the GT.

For concepts, explanations, detailed descriptions and other steps related to the technical solutions provided by the embodiments of the present application, please refer to the descriptions of these contents in the foregoing method embodiments, and details are not repeated here.

Please refer to FIG. 12 , which is a schematic composition diagram of another terminal provided by the embodiment of the present application; as shown in FIG. 12 , the base station may include a processor 210 , a memory 220 and a bus 230 . The processor 210 and the memory 220 are connected through the bus 230, the memory 220 is used to store instructions, and the processor 210 is used to execute the instructions stored in the memory 220, so as to implement the steps in the method corresponding to FIG. 4-FIG. 5 above.

Further, the terminal may also include an input port 240 and an output port 250 . Wherein, the processor 210 , the memory 220 , the input port 240 and the output port 250 may be connected through the bus 230 .

The processor 210 is configured to execute the instructions stored in the memory 220, so as to control the output port 250 to send the first message to the base station, and optionally, also control the input port 240 to receive the first signaling and the second message sent by the base station, to complete the above The steps in the method that the endpoint executes. Wherein, the input port 240 and the output port 250 may be the same or different physical entities. When they are the same physical entity, they can be collectively referred to as input and output ports. The memory 220 may be integrated in the processor 210 , or may be set separately from the processor 210 .

As an implementation manner, the functions of the input port 240 and the output port 250 may be realized by a transceiver circuit or a dedicated chip for transceiver. The processor 210 may be considered to be implemented by a dedicated processing chip, a processing circuit, a processor, or a general-purpose chip.

As another implementation manner, it may be considered to use a general-purpose computer to implement the terminal provided in the embodiment of the present application. The program codes to realize the functions of the processor 210, the input port 240 and the output port 250 are stored in the memory, and the general processor realizes the functions of the processor 210, the input port 240 and the output port 250 by executing the codes in the memory.

For concepts, explanations, detailed descriptions and other steps related to the technical solutions provided by the embodiments of the present application, please refer to the foregoing methods or descriptions of these contents in other embodiments, and details are not repeated here.

Those skilled in the art can understand that, for ease of description, FIG. 9 and FIG. 12 only show a memory and a processor. In an actual controller, there may be multiple processors and memories. A storage may also be called a storage medium or a storage device, etc., which is not limited in this embodiment of the present application. In the embodiment of the present application, the processor may be a central processing unit (Central Processing Unit, referred to as "CPU"), and the processor may also be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs) ), off-the-shelf programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor, or the processor may be any conventional processor, or the like. The memory, which can include read only memory and random access memory, provides instructions and data to the processor. A portion of the memory may also include non-volatile random access memory. In addition to the data bus, the bus may also include a power bus, a control bus, and a status signal bus. However, for clarity of illustration, various buses are labeled as buses in the figures.

According to the method, base station, and terminal provided in the embodiment of the present application, the embodiment of the present application also provides a communication system, including the terminal and the base station. The relationship between the two and the instruction flow can refer to the description and illustration of the embodiment in Figure 1-Figure 5. I won't repeat them here.

Additionally, the terms "system" and "network" are often used interchangeably herein. It should be understood that the term "and/or" in this article is only an association relationship describing associated objects, which means that there may be three relationships, for example, A and/or B may mean: A exists alone, and A and B exist at the same time , there are three cases of B alone. In addition, the character "/" in this article generally indicates that the contextual objects are an "or" relationship.

In the embodiments provided in this application, it should be understood that "B corresponding to A" means that B is associated with A, and B can be determined according to A. However, it should also be understood that determining B according to A does not mean determining B only according to A, and B may also be determined according to A and/or other information.

It should be understood that, in various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the order of execution, and the execution order of the processes should be determined by their functions and internal logic, and should not be used in the embodiments of the present application. The implementation process constitutes any limitation.

Those of ordinary skill in the art can realize that various illustrative logical blocks (illustrative logical blocks) and steps (steps) described in conjunction with the embodiments disclosed herein can be implemented with electronic hardware, or a combination of computer software and electronic hardware. accomplish. Whether these functions are executed by hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art may use different methods to implement the described functions for each specific application, but such implementation should not be regarded as exceeding the scope of the present application.

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

In the above embodiments, all or part of them may be implemented by software, hardware, firmware or any combination thereof. When implemented using software, it may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on the computer, the processes or functions according to the embodiments of the present application will be generated in whole or in part. The computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable devices. The computer instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from a website, computer, server or data center Transmission to another website site, computer, server, or data center by wired (eg, coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (eg, infrared, wireless, microwave, etc.). The computer-readable storage medium may be any available medium that can be accessed by a computer, or a data storage device such as a server or a data center integrated with one or more available media. The available medium may be a magnetic medium (for example, a floppy disk, a hard disk, or a magnetic tape), an optical medium (for example, DVD), or a semiconductor medium (for example, a Solid State Disk (SSD)).

The above is only a specific implementation of the application, but the scope of protection of the application is not limited thereto. Anyone familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the application. Should be covered within the protection scope of this application. Therefore, the protection scope of the present application should be determined by the protection scope of the claims.

Claims (52)

1. A method for random access, comprising: The base station sends first signaling, where the first signaling includes indication information of the length of the guard time interval GT in the first message for random access; The first message includes a preamble and a physical uplink shared channel PUSCH for carrying uplink data, and a GT between the preamble and the PUSCH; Wherein, the method also includes: The base station determines the length of the GT according to the current working frequency band. 2. The method according to claim 1, wherein the length of the GT is less than or equal to a preset threshold. 3. The method according to claim 2, wherein the preset threshold is 16 microseconds. 4. The method according to claim 2, wherein the length of the GT is greater than or equal to the maximum round-trip delay of the cell. 5. The method of claim 1, further comprising: The base station determines the length of the GT according to the length of the preamble and the symbol length of the PUSCH. 6. The method according to claim 5, wherein the base station determines the length of the GT according to the length of the preamble and the symbol length of the PUSCH, comprising: If the length of the preamble is greater than the length of n PUSCH symbols and less than the length of (n+1) PUSCH symbols, the base station uses the length of (n+1) PUSCH symbols minus the length of the preamble as the GT length. 7. The method according to claim 1, wherein the first signaling is a broadcast message or RRC dedicated signaling. 8. The method according to claim 1, wherein the length indication information is used to indicate the length of the GT; Alternatively, the length indication information is used to indicate an index value of the GT length, and the index value is used to obtain the GT length from a preset GT length set. 9. The method according to any one of claims 1-8, further comprising: The base station receives the first message sent by the terminal, and the length of the GT included in the first message is equal to the length of the GT indicated in the length indication information. 10. The method according to claim 9, characterized in that, the first message further includes a filling signal, and the filling signal is located between the preamble and the PUSCH. 11. The method according to claim 10, wherein the filler signal is part of the preamble and/or the PUSCH. 12. The method according to claim 10, wherein the filling signal is a randomly generated random signal. 13. The method according to claim 10, wherein the filler signal is located after the preamble, and the gap between the filler signal and the PUSCH is equal to the length of the GT; Or, the filler signal is located before the PUSCH, and the gap between the filler signal and the preamble is equal to the length of the GT; Alternatively, the filling signal includes a first filling signal and a second filling signal, the first filling signal is located after the preamble, the second filling signal is located before the PUSCH, and the first filling signal and the The gap between the second padding signals is equal to the length of the GT. 14. A method for random access, comprising: The terminal acquires length indication information of a guard time interval GT in the first message for random access, where the length of the GT is related to the current working frequency band of the terminal; The first message includes a preamble, a physical uplink shared channel PUSCH for carrying uplink data, and a GT located between the preamble and the PUSCH. 15. The method according to claim 14, wherein the length of the GT is less than or equal to a preset threshold. 16. The method according to claim 15, wherein the preset threshold is 16 microseconds. 17. The method according to claim 15, wherein the length of the GT is greater than or equal to the maximum round-trip delay of the cell. 18. The method according to claim 14, wherein the terminal obtains the length indication information of the guard time interval GT in the first message for random access, comprising: The terminal receives the first signaling sent by the base station, where the first signaling includes length indication information of the GT. 19. The method according to claim 14 or 18, wherein the length indication information is used to indicate the length of the GT; Alternatively, the length indication information is used to indicate an index value of the GT length, and the index value is used to obtain the GT length from a preset GT length set. 20. The method of claim 14, further comprising: The terminal sends a first message, and the length of the GT contained in the first message is equal to the length of the GT indicated in the length indication information. 21. The method according to any one of claims 14-18, further comprising: The terminal adds a filler signal to an initial gap between the preamble and the PUSCH. 22. The method according to claim 21, wherein the filler signal is part of the preamble and/or the PUSCH. 23. The method according to claim 21, wherein the filling signal is a randomly generated random signal. 24. The method according to claim 21, wherein the terminal adds a filler signal in the initial gap between the preamble and the PUSCH, comprising: The terminal adds the filler signal after the preamble, and the gap between the filler signal and the PUSCH is equal to the length of the GT; Or, the terminal adds the filling signal before the PUSCH, and the gap between the filling signal and the preamble is equal to the length of the GT; Alternatively, the filling signal includes a first filling signal and a second filling signal, the terminal adds the first filling signal after the preamble, and adds a second filling signal before the PUSCH, the first The gap between the stuffing signal and the second stuffing signal is equal to the length of the GT. 25. A base station, comprising: A transceiver unit, configured to send first signaling, where the first signaling includes indication information of the length of the guard time interval GT in the first message for random access; The first message includes a preamble and a physical uplink shared channel PUSCH for carrying uplink data, and a GT between the preamble and the PUSCH; Wherein, the base station further includes a processing unit configured to determine the length of the GT according to a current working frequency band. 26. The base station according to claim 25, wherein the length of the GT is less than or equal to a preset threshold. 27. The base station according to claim 26, wherein the preset threshold is 16 microseconds. 28. The base station according to claim 26, wherein the length of the GT is greater than or equal to the maximum round-trip delay of the cell. 29. The base station according to claim 25, further comprising a processing unit, the processing unit is configured to determine the length of the GT according to the length of the preamble and the symbol length of the PUSCH. 30. The base station according to claim 29, wherein the processing unit is specifically configured to: If the length of the preamble is greater than the length of n PUSCH symbols and less than the length of (n+1) PUSCH symbols, the length of the (n+1) PUSCH symbols minus the length of the preamble is used as the length of the GT, n is an integer greater than 1. 31. The base station according to claim 25, wherein the first signaling is a broadcast message or RRC dedicated signaling. 32. The base station according to claim 25, wherein the length indication information is used to indicate the length of the GT; Alternatively, the length indication information is used to indicate an index value of the GT length, and the index value is used to obtain the GT length from a preset GT length set. 33. The base station according to any one of claims 25-32, wherein the transceiver unit is further used for: receiving the first message sent by the terminal, where the length of the GT included in the first message is equal to the length of the GT indicated in the length indication information. 34. The base station according to claim 33, characterized in that, the first message further includes a filling signal, and the filling signal is located between the preamble and the PUSCH. 35. The base station according to claim 34, wherein the filling signal is part of the preamble and/or the PUSCH. 36. The base station according to claim 34, wherein the filling signal is a randomly generated random signal. 37. The base station according to claim 34, wherein the filler signal is located after the preamble, and the gap between the filler signal and the PUSCH is equal to the length of the GT; Or, the filler signal is located before the PUSCH, and the gap between the filler signal and the preamble is equal to the length of the GT; Alternatively, the filling signal includes a first filling signal and a second filling signal, the first filling signal is located after the preamble, the second filling signal is located before the PUSCH, and the first filling signal and the The gap between the second padding signals is equal to the length of the GT. 38. A base station, comprising: A processor, a memory, and a bus, the processor and the memory are connected through a bus, wherein the memory is used to store a set of program codes, and the processor is used to call the program codes stored in the memory, and perform as claimed in claim 1 - the method described in any one of 13. 39. A computer-readable storage medium, comprising: Instructions are stored in the computer-readable storage medium, and when executed on a computer, the method according to any one of claims 1-13 is implemented. 40. A terminal, characterized by comprising: The transceiver unit is configured to acquire length indication information of a guard time interval GT in the first message for random access, where the length of the GT is related to the current working frequency band of the terminal; The first message includes a preamble, a physical uplink shared channel PUSCH for carrying uplink data, and a GT located between the preamble and the PUSCH. 41. The terminal according to claim 40, wherein the length of the GT is less than or equal to a preset threshold. 42. The terminal according to claim 41, wherein the preset threshold is 16 microseconds. 43. The terminal according to claim 41, wherein the length of the GT is greater than or equal to the maximum round-trip delay of the cell. 44. The terminal according to claim 40, wherein the transceiver unit is configured to receive a first signaling sent by a base station, and the first signaling includes length indication information of the GT. 45. The terminal according to claim 40 or 44, wherein the length indication information is used to indicate the length of the GT; Alternatively, the length indication information is used to indicate an index value of the GT length, and the index value is used to obtain the GT length from a preset GT length set. 46. The terminal according to claim 40, wherein the transceiver unit is further used for: Sending a first message, where the length of the GT included in the first message is equal to the length of the GT indicated in the length indication information. 47. The terminal according to any one of claims 40-44, wherein the terminal further comprises a processing unit configured to: A filler signal is added in an initial gap between the preamble and the PUSCH. 48. The terminal according to claim 47, wherein the filling signal is part of the preamble and/or the PUSCH. 49. The terminal according to claim 47, wherein the filling signal is a randomly generated random signal. 50. The terminal according to claim 47, wherein the processing unit is specifically configured to: adding the filling signal after the preamble, and the gap between the filling signal and the PUSCH is equal to the length of the GT; Or, add the padding signal before the PUSCH, and the gap between the padding signal and the preamble is equal to the length of the GT; Alternatively, the filling signal includes a first filling signal and a second filling signal, the first filling signal is added after the preamble, and a second filling signal is added before the PUSCH, the first filling signal and The gap between the second filling signals is equal to the length of the GT. 51. A terminal, characterized by comprising: A processor, a memory, and a bus, the processor and the memory are connected through a bus, wherein the memory is used to store a set of program codes, and the processor is used to call the program codes stored in the memory, and perform as claimed in claim 14 - the method described in any one of 24. 52. A computer-readable storage medium, comprising: Instructions are stored in the computer-readable storage medium, and when executed on a computer, the method according to any one of claims 14-24 is implemented.

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