CN112970320A

CN112970320A - Random access method, base station, terminal and channel structure

Info

Publication number: CN112970320A
Application number: CN201980074071.7A
Authority: CN
Inventors: 徐伟杰; 吴作敏
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2019-03-29
Filing date: 2019-03-29
Publication date: 2021-06-15
Anticipated expiration: 2039-03-29
Also published as: WO2020199051A1; CN112970320B

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

Random access method, base station, terminal and channel structure

Technical Field

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

Background

The random access procedure refers to a procedure from a user sending a random access preamble to trying to access the network to a time when a basic signaling connection is established with the network. The existing conventional random access generally adopts a four-step access method which is completed by message interaction of msg1-msg4 between a terminal and a base station.

In order to shorten the time delay of the random access process, the existing four-step access method is currently considered to be compressed into a two-step access method. The terminal transmits msgA and the base station responds to msgB. The msgA may include a preamble and an uplink data portion, where the uplink data portion may be carried by a Physical Uplink Shared Channel (PUSCH), but a guard time interval (GT) between the preamble and the PUSCH carrying the uplink data is not explicitly described in the standard.

Disclosure of Invention

The embodiment of the invention provides a random access method, a base station, a terminal and a channel structure, which can ensure that a reasonable GT is kept between a lead code and a PUSCH in a message for random access, meet the time delay requirement of the random access of the terminal and improve the working efficiency of a system.

A first aspect of an embodiment of the present invention provides a random access method, including:

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.

A second aspect of the embodiments of the present invention provides a method for random access, including:

a terminal acquires length indication information of a guard time interval GT in a first message for random access;

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

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

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

the processor and the memory are connected through the bus, wherein the memory is used for storing a group of program codes, and the processor is used for calling the program codes stored in the memory and executing the steps in the first aspect of the embodiment of the present invention or 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 according to any implementation manner of the first aspect of the embodiments of the present invention.

A sixth aspect of an embodiment 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 a first message for random access;

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

the processor and the memory are connected through the bus, wherein the memory is used for storing a group of program codes, and the processor is used for calling the program codes stored in the memory and executing the steps in the second aspect of the embodiment of the invention or any implementation mode of the second aspect.

An eighth aspect of the embodiments of the present invention provides a computer storage medium, which includes a set of program codes for executing the method according to any implementation manner of the second aspect of the embodiments of the present invention.

A ninth aspect 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.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a block diagram of a communication system according to an embodiment of the present invention;

fig. 2 is a flowchart illustrating a random access method according to an embodiment of the present invention;

fig. 3 is a schematic diagram illustrating a channel structure according to an embodiment of the present invention;

fig. 4 is a flowchart illustrating another random access method according to an embodiment of the present invention;

fig. 5 is a flowchart illustrating a further random access method according to an embodiment of the present invention;

fig. 6 is a schematic diagram illustrating another channel structure according to an embodiment of the present invention;

fig. 7 is a schematic diagram illustrating another channel structure according to an embodiment of the present invention;

fig. 8 is a schematic diagram illustrating another channel structure according to an embodiment of the present invention;

fig. 9 is a schematic diagram illustrating a base station according to an embodiment of the present invention;

fig. 10 is a schematic diagram illustrating a configuration of another base station according to an embodiment of the present invention;

fig. 11 is a schematic composition diagram of a terminal according to an embodiment of the present invention;

fig. 12 is a schematic composition diagram of another terminal according to an embodiment of the present invention.

Detailed Description

The terms "including" and "having," and any variations thereof, in the description and claims of this invention and the above-described drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.

With the continuous improvement of communication demand of people, communication technology is rapidly developing, and after a cell search process, a UE and a cell have acquired downlink synchronization, so that a terminal can receive downlink data. However, the terminal can perform uplink transmission only if it acquires uplink synchronization with the cell. The terminal establishes a connection with the cell through a Random Access Procedure (Random Access Procedure) and acquires uplink synchronization. The main purposes of random access include: (1) obtaining uplink synchronization; (2) and allocating a unique Cell Radio Network Temporary Identifier (C-RNTI) for the terminal. Random access can be completed between the base station and the terminal through msg1-msg 4: msg1, the terminal sends a random access preamble (preamble); msg2, the base station sends a random access response message; the msg3 includes that a terminal transmits msg3, and the contents of msg3 correspond to several types of trigger events of random access, for example, the contents of msg3 during initial access are Radio Resource Control (RRC) connection requests, and the contents of msg3 during connection reestablishment are RRC connection reestablishment requests; msg4, the base station sends a collision resolution message. Thereby completing the random access procedure.

As users desire lower and lower random access delay, the existing four-step access method using msg1-msg4 interaction can be replaced by the two-step access method using msgA-msgB interaction. The terminal transmits msgA and the base station responds to msgB. msgA, which may also be referred to as a first message of random access, may contain a preamble and an uplink data portion, where the uplink data portion may be used to carry identification information of the terminal and the reason for the RRC request (substantially equivalent to what the existing msg3 contains); the msgB may also be referred to as a second message of random access, which may include collision resolution information as well as Timing Advance (TA) information, allocation information of C-RNTI, and the like, (substantially equivalent to the information included in the existing msg2 and msg 4). When this two-step access method is applied to a new air interface (NR-U) system operating in Unlicensed Spectrum, since the NR-U system operating on the unlicensed spectrum, multiple devices, and even devices of different systems (e.g., WIFI), needs to share the unlicensed spectrum by means of channel preemption, therefore, before sending a signal, a device needs to listen to a channel first and can send the signal after determining that the channel is idle, this mechanism is called Listen Before Talk (LBT), in order to improve the efficiency of the system, it is necessary to reduce the number of LBTs when the terminal randomly accesses, but in a system operating in an unlicensed spectrum such as NR-U, since the length of a guard time interval (GT) between a preamble and a PUSCH in msgA is uncertain, a terminal cannot realize fast random access. It is therefore desirable to provide a method that allows a terminal to implement fast random access in such systems.

For convenience of explanation, the embodiment of the present invention is described with reference to a 5G system, and it should be understood by those skilled in the art that the implementation manner in the embodiment of the present invention is also applicable to existing communication systems and future higher-level communication systems such as 6G and 7G, and the embodiment of the present invention is not limited in any way.

The following describes the random access method and apparatus in accordance with the embodiments of the present invention in detail with reference to the accompanying drawings.

Fig. 1 is a schematic diagram of a communication system according to an embodiment of the present invention. The UE may include a base station and at least one terminal, and the terminal may also be referred to as a User Equipment (UE).

The Base Station may be an evolved Node B (eNB), a Node B (NB), a Base Station Controller (BSC), a Base Transceiver Station (BTS), a Home Base Station (e.g., Home evolved Node B or Home Node B, HNB), a BaseBand Unit (BBU), and the like. Which may also be referred to by those skilled in the art as a Base Station transceiver, a radio Base Station, a radio transceiver, a transceiver function, a Base Station Subsystem (BSS), or some other suitable terminology. It may determine the length of the GT informing the terminal of the length of the GT.

Among other things, a terminal may include a cellular phone, a smart phone, a Session Initiation Protocol (SIP) phone, a laptop, a Personal Digital Assistant (PDA), a satellite radio, a global positioning system, a multimedia device, a video device, a Digital audio player (e.g., MP3 player), a camera, a game console, or any other similar functioning device. A terminal may also be referred to by those skilled in the art as a mobile station, a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless communications device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable terminology. The method can acquire the length of the GT, construct a first message based on the length of the GT and send the first message to the base station, and realize fast random access.

Fig. 2 is a schematic flow chart of a random access method according to an embodiment of the present invention; in this embodiment, the method comprises the steps of:

s201, the base station determines the length of the GT in the first message for random access.

Wherein 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.

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

The preset threshold may be determined based on access delay requirements of the currently operating communication system and/or terminal. For example, when the method is applied to an NR-U system, the terminal may expect a low access delay, and access may be completed by using a single LBT, where the preset threshold may be set to 16 microseconds.

When the length of the GT is less than or equal to 16 microseconds, based on the usage rule of the unlicensed spectrum, when the interval between two transmissions of the terminal is less than 16 microseconds, LBT does not need to be performed before the second transmission, and therefore the access efficiency of the terminal can be significantly improved.

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

Since there may be one or more terminals located within the range of the cell, the length of the GT may be greater than or equal to a maximum Round-Trip Time (RTT) determined based on the radius of the cell, and the maximum Round-Trip Time may be used to characterize the Round-Trip delay between the terminal located at the edge of the cell and the base station. Which can be determined by dividing the cell radius by the speed of light and multiplying by 2. If the cell radius is R meters, RTT 2 × R/c, where c represents the speed of light. Based on this equation, if the cell radius is 1.25 km, the RTT is 8.33 microseconds.

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

When determining the length of the GT, the base station may determine in any one of the following manners:

1) the preset length is used as the GT length. The base station may select a predetermined length predetermined with the terminal as the GT length, for example, predetermined GT 16 microseconds or GT 8 microseconds or GT 0 microseconds. It should be noted that, when GT is equal to 0 μ sec, it is stated that the length of the cyclic prefix of the PUSCH symbol in the PUSCH is already sufficient to be used as the guard time, and therefore GT may be configured to be 0 μ sec.

2) And the base station determines the length of the GT according to the current working frequency band, and the working frequency band and the length of the GT have a corresponding relation. For example, the NR-U system operating in the low frequency band FR1, GT 16 microseconds; in the NR-U system operating in the high frequency range FR2, GT is 8 microseconds.

3) And 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 preamble length 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 preamble length is not greater than 16 microseconds, the length of (n +1) PUSCH symbols minus the length of the preamble may be used as the length of GT. When the above condition is not satisfied, GT 16us, or other agreed length may be configured.

It should be noted here that PUSCH in msgA may use different subcarrier sizes (SCS for short), for example, low frequency FR1, PUSCH may use SCS of 15KHz or 30 KHz; for high frequency FR2, PUSCH may use SCS of 120KHz,240 KHz.

After the length of the GT is determined, a channel structure for random access is determined. Specifically, refer to fig. 3, which is a schematic diagram illustrating a channel structure according to an embodiment of the present invention. As shown in fig. 3, the channel structure includes:

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 be greater than or equal to the maximum round trip delay of the cell.

Wherein, viewed from time first and second, the preamble is located before the GT, and the GT is located before the PUSCH. And the preamble may include two parts of a Cyclic Prefix (CP) and a preamble sequence. And the length of the preamble is more than 3 PUSCH symbols and less than 4 PUSCH symbols, and the length of the PUSCH is equal to 2 PUSCH symbols. Here, GT is the length of 4 PUSCH symbols minus the length of the preamble, and GT is less than or equal to 16 microseconds.

S202, the base station sends a first signaling.

The first signaling contains length indication information of a GT in a first message for random access.

The terminal may be notified when the base station determines the length of the GT.

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 a length of the GT;

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

Thus, when notifying the length of the terminal GT, the base station may notify the terminal of a specific length value, or may pre-configure a candidate set of the length of the GT for the terminal, and then notify the terminal of an index value, and the terminal determines the specific GT value using the candidate set according to the index value.

S203, the base station receives a 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 be symbol aligned, an initial GAP (GAP) between the preamble and the PUSCH is uncertain, and there may be a case where the GAP is greater than a preset threshold, for example, 16 microseconds, at this time, the terminal may fill the initial GAP, so that the length of the filled obtained GAP is the same as that of the GT.

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

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

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

alternatively, the padding signal may also precede the PUSCH, and the gap between the padding signal and the preamble is equal to the length of the GT;

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

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

The second message here is the aforementioned msgB.

In this embodiment, step S202 may exist and be executed independently, or may be executed in sequence with other steps, and the embodiment of the present invention is not limited at all.

By adopting the method of the embodiment, a reasonable guard time interval (GT) is kept between the preamble and the PUSCH in the msgA, so that the requirement that the terminal in the NR-U system only uses LBT once when transmitting the msgA is met, and the GT can meet various requirements such as different deployment scenes (such as the radius of a cell), the subcarrier interval of the PUSCH and the like. The optimal configuration of the GT is realized, the working efficiency and the performance of the system are improved, and better communication experience is provided for users.

Fig. 4 is a schematic flow chart of another random access method according to an embodiment of the present invention; in this embodiment, the method comprises the steps of:

s401, the terminal acquires length indication information of the GT in the first message for random access.

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

The predetermined threshold may be 16 microseconds or other values.

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

Optionally, the terminal may acquire the length of the GT in any one of the following manners:

1) and the terminal receives a first signaling sent by the base station, wherein the first signaling contains 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, the terminal can determine the length of the GT according to the current working frequency band, and the working frequency band and the length of the GT have a corresponding relation.

When the terminal determines the length of the GT, the implementation is substantially similar to that of the base station, and reference may be made to the description of the base station side, which is not described herein again.

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

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

In this embodiment, step S402 may exist and be executed independently, or may be executed in sequence with other steps, and the embodiment of the present invention is not limited at all.

This embodiment is described on the terminal side, and specific details can be referred to the description of the embodiment on the base station side shown in fig. 2.

Referring to fig. 5, which is a flowchart illustrating another random access method according to an embodiment of the present invention, steps S501 and S401 are the same, and steps S503 to S504 are the same as steps S402 to S403 in fig. 4, which are not described herein again, and the method may further include:

s502, the terminal adds a filling signal in the initial gap between the preamble and the PUSCH.

It should be noted that, in this embodiment, steps S501 to S502 may exist and be executed independently, or may be executed in sequence with other steps, and the embodiment of the present invention is not limited at all.

Because the length of the preamble is not fixed and the PUSCH needs to be symbol aligned, an initial GAP (GAP) between the preamble and the PUSCH is uncertain, and there may be a case where the GAP is greater than 16 microseconds.

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

When the padding signal is formed using x sampling points in the preamble, the padding signal may maintain the same peak-to-average ratio characteristic as the preamble. Therefore, the terminal can keep stable power output when sending the lead code, and the power sending of the whole msgA is not required to be reduced due to the overlarge peak-to-average ratio of the filling signal, so that the terminal can transmit with higher transmitting power when the coverage of the terminal is limited (for example, the terminal is positioned at the edge of a cell), and the network connection performance is ensured. In addition, the sampling points of the preambles of the part carried by the filling signal can be utilized by the base station, so that the detection performance of the preambles is improved.

Similarly, when the padding signal is formed with x sampling points in the PUSCH, the padding signal may maintain the same peak-to-average ratio characteristics as the PUSCH. Therefore, the terminal can keep stable power output when sending the PUSCH in the msgA, the power sending of the whole msgA is not required to be reduced due to the overlarge peak-to-average ratio of the filling signal, and the terminal can transmit with higher transmitting power when the coverage of the terminal is limited (for example, when the terminal is positioned at the edge of a cell), thereby ensuring the network connection performance. In addition, the sampling points of the PUSCH of the filling signal carrying part can be utilized by the base station, and the detection performance of the PSUCH is further improved.

Of course, alternatively, the padding signal may 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 adding, by the terminal, a padding signal in the initial gap between the preamble and the PUSCH may include:

the terminal adding the padding signal after the preamble, a gap between the padding signal and the PUSCH being equal to a length of the GT;

or, the terminal adds the padding signal before the PUSCH, and a gap between the padding signal and the preamble is equal to a length of the GT;

or, the padding signal includes a first padding signal and a second padding signal, the terminal adds the first padding signal after the preamble and adds the second padding signal before the PUSCH, and a gap between the first padding signal and the second padding signal is equal to a length of the GT.

Based on the three filling modes, different channel structures can be obtained. For convenience of description, the preset threshold is described as 16 microseconds, and the preset threshold may be another value, which does not limit the embodiment of the present invention in any way.

Fig. 6 is a schematic diagram of another channel structure according to an embodiment of the present invention.

The channel structure comprises a preamble, a Physical Uplink Shared Channel (PUSCH) and a guard time interval (GT) between the preamble and the PUSCH;

from the time perspective, the preamble is located before the GT, which is located before the PUSCH. And the preamble may include both a Cyclic Prefix (CP) and a preamble sequence. The length of the preamble is more than 3 PUSCH symbols and less than 4 PUSCH symbols, and the length of the PUSCH is equal to 2 PUSCH symbols. Here GT is the length of 4 PUSCH symbols minus the length of the preamble, and the initial GAP is greater than 16 microseconds. And to meet the requirement that GT be 16 microseconds or less. The first x sampling points of the preamble sequence may be copied and added to a position adjacent to the preamble sequence after the preamble sequence, that is, the oblique line part at the front end of the preamble sequence in fig. 6 is acquired and copied to the oblique line part after the preamble sequence, the oblique line part after the preamble sequence is a padding (padding) signal, and after padding, GT is enabled to meet the requirement of being less than or equal to 16 microseconds.

Fig. 7 is a schematic diagram of another channel structure according to an embodiment of the present invention.

from the time perspective, the preamble is located before the GT, which is located before the PUSCH. And the preamble may include both a Cyclic Prefix (CP) and a preamble sequence. The length of the preamble is more than 3 PUSCH symbols and less than 4 PUSCH symbols, and the length of the PUSCH is equal to 2 PUSCH symbols. Here GT is the length of 4 PUSCH symbols minus the length of the preamble, and the initial GAP is greater than 16 microseconds. And to meet the requirement that GT be 16 microseconds or less. The last x sampling points of the PUSCH can be copied and added to the position adjacent to the PUSCH before the PUSCH, that is, the oblique line part at the end of the PUSCH in fig. 7 is collected and copied to the oblique line part before the PUSCH, the oblique line part before the PUSCH is a padding signal, and after padding, the GT meets the requirement of being less than or equal to 16 microseconds.

Please refer to fig. 8, which is a schematic diagram illustrating another channel structure according to an embodiment of the present invention.

from the time perspective, the preamble is located before the GT, which is located before the PUSCH. And the preamble may include both a Cyclic Prefix (CP) and a preamble sequence. The length of the preamble is more than 3 PUSCH symbols and less than 4 PUSCH symbols, and the length of the PUSCH is equal to 2 PUSCH symbols. Here GT is the length of 4 PUSCH symbols minus the length of the preamble, and the initial GAP is greater than 16 microseconds. And to meet the requirement that GT be 16 microseconds or less. The first a sampling points of the preamble sequence may be copied and added to a position after the preamble sequence and adjacent to the preamble sequence, that is, the slash part at the front end of the preamble sequence in fig. 8 is acquired and copied to the slash part after the preamble sequence, the slash part after the preamble sequence is the padding (padding) signal of the first part, in addition, the last b sampling points of the PUSCH may be copied and added to a position before the PUSCH and adjacent to the PUSCH, that is, the slash part at the end of the PUSCH in fig. 8 is acquired and copied to the slash part before the PUSCH, and the slash part before the PUSCH is the padding (padding) signal of the second part. After the two-part filling, GT is enabled to meet the requirement of less than or equal to 16 microseconds.

By adopting the mode of the embodiment, a reasonable guard time interval (GT) is kept between the preamble and the PUSCH in the msgA, so that the requirement that the terminal in the NR-U system only uses LBT once when transmitting the msgA is met, and the GT can meet various requirements such as different deployment scenes (such as cell radius size), the subcarrier interval of the PUSCH and the like. In addition, by designing a reasonable filling signal, the reasonable GT size is realized, meanwhile, the transmission of the filling signal is ensured not to influence the msgA transmitting power, and the network coverage performance is ensured.

Fig. 9 is a schematic diagram of a base station according to an embodiment of the present invention; in this embodiment, the base station includes:

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

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

Optionally, the preset threshold is 16 microseconds.

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

Optionally, the base station further comprises a processing unit 200, and the processing unit 200 is configured to determine the length of the GT according to the current operating 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:

and if the length of the preamble is larger than the length of n PUSCH symbols and smaller than the length of (n +1) PUSCH symbols, taking the length of (n +1) PUSCH symbols minus the length of the preamble as the length of the GT.

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

Optionally, the transceiver unit 100 is further configured to:

receiving a first message sent by the terminal, wherein 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 comprises a padding signal, the padding signal being located between the preamble and the PUSCH.

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

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

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

or, the padding signal is located before the PUSCH, and a gap between the padding signal and the preamble is equal to a length of the GT;

For the concepts, explanations, details and other steps related to the technical solutions provided in the embodiments of the present application related to the base station, reference is made to the description of these contents in the foregoing method embodiments, and no further description is given here.

Please refer to fig. 10, which is a schematic diagram illustrating a configuration of another base station according to an 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 by a bus 130, the memory 120 is used for storing instructions, and the processor 110 is used for executing the instructions stored by the memory 120 to realize the steps of the method corresponding to the above fig. 2.

Further, the base station may also 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 by a bus 130.

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

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

As another implementation manner, a base station provided in the embodiment of the present application may be implemented by using a general-purpose computer. Program code that implements the functionality of processor 110, input ports 140 and output ports 150 is stored in memory, and a general purpose processor implements the functionality of processor 110, input ports 140 and output ports 150 by executing the code in memory.

For the concepts, explanations, details and other steps related to the technical solutions provided in the embodiments of the present application related to the base station, please refer to the descriptions of the foregoing methods or other embodiments, which are not described herein again.

Fig. 11 is a schematic diagram of a terminal according to an embodiment of the present invention; in this embodiment, the terminal includes:

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

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

Optionally, the preset threshold is 16 microseconds.

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

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

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

Optionally, the transceiver unit 300 is further configured to:

transmitting a first message, a length of a GT included in the first message being equal to a 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:

adding a padding signal in an initial gap between the preamble and the PUSCH.

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

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

Optionally, the processing unit 400 is specifically configured to:

adding the padding signal after the preamble, a gap between the padding signal and the PUSCH being equal to a length of the GT;

or, the padding signal is added before the PUSCH, and a gap between the padding signal and the preamble is equal to a length of the GT;

or, the padding signals include a first padding signal and a second padding signal, the first padding signal is added after the preamble, and the second padding signal is added before the PUSCH, and a gap between the first padding signal and the second padding signal is equal to a length of the GT.

For the concepts, explanations, details and other steps related to the technical solutions provided in the embodiments of the present application related to the terminal, please refer to the description of these contents in the foregoing method embodiments, which is not described herein again.

Please refer to fig. 12, which is a schematic diagram illustrating a composition of another terminal according to an 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 by a bus 230, the memory 220 is used for storing instructions, and the processor 210 is used for executing the instructions stored by the memory 220 to realize the steps in the method corresponding to the above fig. 4-5.

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

The processor 210 is configured to execute the instructions stored in the memory 220 to control the output port 250 to send the first message to the base station, and optionally, control the input port 240 to receive the first signaling and the second message sent by the base station, so as to complete the steps performed by the terminal in the above method. 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 may be collectively referred to as an input-output port. The memory 220 may be integrated in the processor 210 or may be provided 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 transceiving. Processor 210 may be considered to be implemented by a dedicated processing chip, processing circuit, processor, or a general-purpose chip.

As another implementation manner, a manner of using a general-purpose computer to implement the terminal provided in the embodiment of the present application may be considered. Program code that implements the functions of the processor 210, the input ports 240 and the output ports 250 is stored in memory, and a general purpose processor implements the functions of the processor 210, the input ports 240 and the output ports 250 by executing the code in the memory.

For the concepts, explanations, details and other steps related to the technical solutions provided in the embodiments of the present application related to the terminal, please refer to the descriptions of the foregoing methods or other embodiments, which are not described herein again.

Those skilled in the art will appreciate that fig. 9 and 12 show only one memory and processor for ease of illustration. In an actual controller, there may be multiple processors and memories. The memory may also be referred to as a storage medium or a storage device, and the like, which is not limited in this application. In the embodiments of the present application, the processor may be a Central Processing Unit (CPU), and the processor may also be other general-purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The memory may include both read-only memory and random access memory, and provides instructions and data to the processor. The portion of memory may also include non-volatile random access memory. The bus may include a power bus, a control bus, a status signal bus, and the like, in addition to the data bus. But for clarity of illustration the various buses are labeled as buses in the figures.

According to the method, the base station and the terminal provided by the embodiment of the present application, the embodiment of the present application further provides a communication system, which includes the terminal and the base station, and the relationship and the instruction flow between the terminal and the base station may refer to the description and illustration in the embodiments of fig. 1 to 5, which are not described herein again.

In addition, the terms "system" and "network" are often used interchangeably herein. It should be understood that the term "and/or" herein is merely one type of association relationship that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

In the embodiments provided herein, it should be understood that "B corresponding to a" means that B is associated with a from which B can be determined. It should also be understood that determining B from a does not mean determining B from a alone, but may be determined from a and/or other information.

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

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

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

In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, 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 loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the application to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website site, computer, server, or data center to another website site, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.

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

Claims

A method of random access, comprising:

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.
The method of claim 1, wherein the length of the GT is equal to or less than a preset threshold.
The method of claim 2, wherein the preset threshold is 16 microseconds.
A method according to claim 2 or 3, wherein the length of the GT is equal to or greater than the maximum round trip delay of the cell.
The method of claim 1, wherein the method further comprises:

and the base station determines the length of the GT according to the current working frequency band.
The method of claim 1, wherein the method further comprises:

and the base station determines the length of the GT according to the length of the preamble and the symbol length of the PUSCH.
The method of claim 6, wherein the base station determining the length of the GT according to the length of the preamble and the symbol length of the PUSCH comprises:

if the preamble length is greater than the length of n PUSCH symbols and less than the length of (n +1) PUSCH symbols, the base station takes the length of (n +1) PUSCH symbols minus the length of the preamble as the length of the GT.
The method of claim 1, wherein the first signaling is a broadcast message or Radio Resource Control (RRC) dedicated signaling.
The method of claim 1, wherein the length indication information is for indicating a length of the GT;

or, the length indication information is used to indicate an index value of the length of the GT, and the index value is used to obtain the length of the GT from a preset length set of the GT.
The method of any one of claims 1-9, further comprising:

and the base station receives a first message sent by the terminal, wherein the length of the GT contained in the first message is equal to the length of the GT indicated in the length indication information.
The method of claim 10, wherein the first message further comprises a padding signal, the padding signal being located between the preamble and the PUSCH.
The method of claim 11, wherein the padding signal is part of the preamble and/or the PUSCH.
The method of claim 11, wherein the padding signal is a randomly generated random signal.
The method of any of claims 11-13, wherein the padding signal is located after the preamble, and wherein a gap between the padding signal and the PUSCH is equal to a length of the GT;

or, the padding signal is located before the PUSCH, and a gap between the padding signal and the preamble is equal to a length of the GT;

or, the padding signal includes a first padding signal and a second padding signal, the first padding signal is located after the preamble, the second padding signal is located before the PUSCH, and a gap between the first padding signal and the second padding signal is equal to a length of the GT.
A method of random access, comprising:

a terminal acquires 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.
The method of claim 15, wherein the length of the GT is equal to or less than a preset threshold.
The method of claim 15, wherein the preset threshold is 16 microseconds.
A method according to claim 16 or 17, wherein the length of the GT is equal to or greater than the maximum round trip delay of the cell.
The method of claim 15, wherein the terminal acquiring the length indication information of the guard time interval GT in the first message for random access comprises:

the terminal receives a first signaling sent by a base station, wherein the first signaling contains length indication information of the GT.
The method of claim 15 or 19, wherein the length indication information is for indicating a length of the GT;

or, the length indication information is used to indicate an index value of the length of the GT, and the index value is used to obtain the length of the GT from a preset length set of the GT.
The method of claim 15, wherein the GT has a length that is a predetermined length.
A method according to claim 15, wherein the length of the GT is related to the current operating frequency band of the terminal.
The method of claim 15, wherein the method further comprises:

the terminal transmits a first message, wherein the length of the GT contained in the first message is equal to the length of the GT indicated in the length indication information.
The method of any one of claims 15-23, further comprising:

the terminal adds a padding signal in an initial gap between the preamble and the PUSCH.
The method of claim 24, wherein the padding signal is part of the preamble and/or the PUSCH.
The method of claim 24, wherein the padding signal is a randomly generated random signal.
The method of any of claims 24-26, wherein the terminal adds a padding signal in an initial gap between the preamble and the PUSCH, comprising:

the terminal adding the padding signal after the preamble, a gap between the padding signal and the PUSCH being equal to a length of the GT;

or, the terminal adds the padding signal before the PUSCH, and a gap between the padding signal and the preamble is equal to a length of the GT;

or, the padding signal includes a first padding signal and a second padding signal, the terminal adds the first padding signal after the preamble and adds the second padding signal before the PUSCH, and a gap between the first padding signal and the second padding signal is equal to a length of the GT.
A base station, comprising:

a transceiver unit, configured to send a 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 comprises a preamble and a physical uplink shared channel, PUSCH, for carrying uplink data, and a GT located between the preamble and the PUSCH.
The base station of claim 28, wherein the length of the GT is equal to or less than a preset threshold.
The base station of claim 29, wherein the predetermined threshold is 16 microseconds.
A base station according to claim 29 or 30, wherein the GT has a length equal to or greater than a cell maximum round trip delay.
A base station according to claim 28, wherein the base station further comprises a processing unit for determining the length of the GT in dependence on the current operating frequency band.
The base station of claim 29, wherein the base station further comprises a processing unit to determine the length of the GT from the length of the preamble and the symbol length of the PUSCH.
The base station of claim 33, wherein the processing unit is specifically configured to:

and if the length of the preamble code is greater than the length of n PUSCH symbols and less than the length of (n +1) PUSCH symbols, taking the length of the (n +1) PUSCH symbols minus the length of the preamble code as the length of the GT, wherein n is an integer greater than 1.
The base station of claim 29, wherein the first signaling is a broadcast message or radio resource control, RRC, dedicated signaling.
The base station of claim 29, wherein the length indication information is for indicating a length of the GT;

or, the length indication information is used to indicate an index value of the length of the GT, and the index value is used to obtain the length of the GT from a preset length set of the GT.
The base station according to any of claims 29-36, wherein said transceiver unit is further configured to:

receiving a first message sent by the terminal, wherein the length of the GT included in the first message is equal to the length of the GT indicated in the length indication information.
The base station of claim 37, wherein the first message further comprises a padding signal, the padding signal being located between the preamble and the PUSCH.
The base station of claim 38, wherein the padding signal is a portion of the preamble and/or the PUSCH.
The base station of claim 38, wherein the filler signal is a randomly generated random signal.
The base station of any of claims 38-40, wherein the padding signal is located after the preamble, and wherein a gap between the padding signal and the PUSCH is equal to a length of the GT;

or, the padding signal is located before the PUSCH, and a gap between the padding signal and the preamble is equal to a length of the GT;

or, the padding signal includes a first padding signal and a second padding signal, the first padding signal is located after the preamble, the second padding signal is located before the PUSCH, and a gap between the first padding signal and the second padding signal is equal to a length of the GT.
A base station, comprising:

a processor, a memory and a bus, the processor and the memory being connected by the bus, wherein the memory is configured to store a set of program code, and the processor is configured to call the program code stored in the memory to perform the steps of any of claims 1-14.
A computer-readable storage medium, comprising:

the computer-readable storage medium has stored therein instructions which, when run on a computer, implement the method of any one of claims 1-14.
A terminal, comprising:

a transceiver unit, configured to acquire 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.
The terminal of claim 44, wherein the GT has a length equal to or less than a preset threshold.
The terminal of claim 45, wherein the preset threshold is 16 microseconds.
A terminal according to claim 44 or 45, wherein the GT has a length equal to or greater than the maximum round trip delay of the cell.
The terminal of claim 44, wherein the transceiver component is configured to receive first signaling sent by a base station, the first signaling comprising length indication information of the GT.
The terminal of claim 44 or 48, wherein the length indication information is for indicating a length of the GT;

or, the length indication information is used to indicate an index value of the length of the GT, and the index value is used to obtain the length of the GT from a preset length set of the GT.
The terminal of claim 44, wherein the GT is of a predetermined length.
A terminal according to claim 44, wherein the GT has a length related to the current operating frequency band of the terminal.
The terminal of claim 44, wherein the transceiver unit is further configured to:

transmitting a first message, a length of a GT included in the first message being equal to a length of the GT indicated in the length indication information.
The terminal according to any of claims 44-52, wherein the terminal further comprises a processing unit for:

adding a padding signal in an initial gap between the preamble and the PUSCH.
The terminal of claim 53, wherein the padding signal is part of the preamble and/or the PUSCH.
The terminal of claim 53, wherein the padding signal is a randomly generated random signal.
The terminal according to any of claims 53-55, wherein the processing unit is specifically configured to:

adding the padding signal after the preamble, a gap between the padding signal and the PUSCH being equal to a length of the GT;

or, the padding signal is added before the PUSCH, and a gap between the padding signal and the preamble is equal to a length of the GT;

or, the padding signals include a first padding signal and a second padding signal, the first padding signal is added after the preamble, and the second padding signal is added before the PUSCH, and a gap between the first padding signal and the second padding signal is equal to a length of the GT.
A terminal, comprising:

a processor, a memory and a bus, the processor and the memory being connected by the bus, wherein the memory is configured to store a set of program code, and the processor is configured to call the program code stored in the memory to perform the steps of any of claims 15-27.
A computer-readable storage medium, comprising:

the computer-readable storage medium has stored therein instructions which, when run on a computer, implement the method of any one of claims 15-27.
A channel structure for random access, comprising:

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 channel structure of claim 59, wherein the preset threshold is 16 microseconds.
A channel structure as claimed in claim 59 or 60, wherein the GT has a length equal to or greater than the maximum round trip delay of the cell.
The channel structure of claim 59, wherein the channel structure further comprises:

a padding signal located between the preamble and the PUSCH.
The channel structure of claim 62, wherein the padding signal is a portion of the preamble and/or the PUSCH.
The channel structure of claim 62, wherein the filler signal is a randomly generated random signal.
The channel structure according to any of claims 62-64, wherein the padding signal is located after the preamble, and a gap between the padding signal and the PUSCH is equal to a length of the GT;

or, the padding signal is located before the PUSCH, and a gap between the padding signal and the preamble is equal to a length of the GT;

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