CN112075118A

CN112075118A - Random access method, device, equipment and storage medium

Info

Publication number: CN112075118A
Application number: CN202080001801.3A
Authority: CN
Inventors: 朱亚军; 洪伟; 王天佳; 李勇
Original assignee: Beijing University of Posts and Telecommunications; Beijing Xiaomi Mobile Software Co Ltd
Current assignee: Beijing University of Posts and Telecommunications; Beijing Xiaomi Mobile Software Co Ltd
Priority date: 2020-08-05
Filing date: 2020-08-05
Publication date: 2020-12-11
Anticipated expiration: 2040-08-05
Also published as: WO2022027383A1; CN112075118B

Abstract

The embodiment of the disclosure provides a method for non-terrestrial network (NTN) random access, which is applied to access equipment, wherein the method comprises the following steps: responding to a plurality of received random access requests carrying the same random access lead code, and issuing a plurality of random access responses; wherein at least one random access parameter carried by the plurality of random access responses has different parameter values; and different random access parameter values are used for responding to the subsequent random access process by random access.

Description

Random access method, device, equipment and storage medium

Technical Field

The present disclosure relates to the field of wireless communications technologies, but not limited to the field of wireless communications technologies, and in particular, to a method, an apparatus, a device, and a storage medium for random access.

Background

Non-Terrestrial network (NTN) communications, particularly satellite communications, are due to the characteristics of wide coverage, strong disaster resistance, and large capacity. In a new air interface research project of a fifth generation mobile communication (5G) in a third generation mobile communication partnership project (3GPP) oriented to a non-terrestrial network (NTN), a deployment scenario of the non-terrestrial network (NTN) and a channel model of the non-terrestrial network (NTN) are researched, a next generation radio access network architecture based on the non-terrestrial network (NTN) is researched, and a solution of a network architecture in which the non-terrestrial network (NTN) and the fifth generation mobile communication (5G) network are converged is defined and evaluated. In communication based on a non-terrestrial network (NTN), when a terminal performs random access, the efficiency at the time of random access is low, and the success rate of random access is low.

Disclosure of Invention

The embodiment of the disclosure discloses a method for non-terrestrial network (NTN) random access, which is applied to access equipment, wherein the method comprises the following steps:

responding to a plurality of received random access requests carrying the same random access lead code, and issuing a plurality of random access responses;

wherein at least one random access parameter carried by the plurality of random access responses has different parameter values; the different random access parameters are used for responding to a subsequent random access process by the random access.

In one embodiment of the present invention,

the random access parameter is associated with a third message (Msg3) in a random access procedure.

In one embodiment, the random access parameter includes at least one of:

timing Advance (TA);

a time-frequency resource parameter of the third message (Msg 3);

a temporary cell radio network temporary identity (TC-RNTI);

a first number of retransmissions of the third message (Msg 3).

In one embodiment, the method further comprises:

receiving the third message (Msg3) returned based on the random access parameters;

in response to a failure to decode the third message (Msg3), determining a second number of retransmissions of the third message (Msg3) based on the received power of the random access request.

In one embodiment, the method further comprises:

and re-issuing the random access response carrying the second retransmission times.

In one embodiment, the method further comprises:

issuing configuration information, wherein the configuration information at least comprises: desired power information indicating a desired received power of the random access request.

In one embodiment, the method further comprises:

determining whether a plurality of random access requests carrying the same random access preamble code are received in response to the reception power according to the plurality of random access requests.

In one embodiment, the determining whether a plurality of random access requests carrying the same random access preamble code are received in response to the received power of the plurality of random access requests comprises at least one of:

determining whether a plurality of random access requests carrying the same random access preamble code are received in response to a peak correlation according to the received power of the plurality of random access requests;

and responding to the difference between the receiving power and the power threshold value of the plurality of random access requests, and determining whether a plurality of random access requests carrying the same random access preamble code are received.

According to a second aspect of the embodiments of the present disclosure, there is provided a method for non-terrestrial network (NTN) random access, which is applied to a terminal, wherein the method includes:

receiving a plurality of random access responses, wherein at least one random access parameter carried by the plurality of random access responses has different parameter values;

wherein the different random access parameters are used for the random access response to the subsequent random access process.

In one embodiment, the random access parameter includes at least one of:

timing Advance (TA);

a time-frequency resource parameter of the third message (Msg 3);

a temporary cell radio network temporary identity (TC-RNTI);

a first number of retransmissions of the third message (Msg 3).

In one embodiment, the method further comprises:

and sending the third message (Msg3) in the random access process according to the random access parameters of which the Time Advance (TA) carried by the random access responses is matched with the estimated Time Advance (TA) of the terminal.

In one embodiment, the method further comprises:

and determining the estimated Time Advance (TA) according to first position information when the access equipment sends the pilot signal and second position information when the terminal receives the pilot signal.

In one embodiment, the determining the estimated Time Advance (TA) according to first location information when the access device transmits a pilot signal and second location information when the terminal receives the pilot signal includes:

determining a distance between the position of the terminal and the center position of the transmission beam of the access device according to the second position information when the terminal receives the pilot signal, the third position information of the access device and the first position information of the center of the transmission beam when the access device transmits the pilot signal;

determining the estimated Time Advance (TA) from the distance.

In one embodiment, the method further comprises:

obtaining ephemeris data of the access equipment based on the received pilot signal transmitted by the access equipment;

and determining the position information of the access equipment and the central position information of the wave beam of the access equipment according to the ephemeris data.

In one embodiment, the method further comprises:

receiving a retransmitted random access response, wherein the retransmitted random access response carries a second number of retransmissions of the third message (Msg 3).

In one embodiment, the method further comprises:

resending the third message (Msg3) based on the second number of retransmissions.

In one embodiment, the method further comprises:

receiving configuration information, wherein the configuration information at least comprises: desired power information indicating a desired received power of the random access request; wherein the random access request is transmitted at the desired power.

According to a third aspect of the embodiments of the present disclosure, an apparatus for non-terrestrial network (NTN) random access is provided, wherein the apparatus includes a transmitting module, wherein the first transmitting module is configured to:

In one embodiment, the first sending module is further configured to: the random access parameter is associated with a third message (Msg3) in a random access procedure.

In one embodiment, the first sending module is further configured to: the random access parameter comprises at least one of the following:

timing Advance (TA);

a time-frequency resource parameter of the third message (Msg 3);

a temporary cell radio network temporary identity (TC-RNTI);

a first number of retransmissions of the third message (Msg 3).

In one embodiment, the apparatus further comprises a first receiving module and a first determining module, wherein,

the first receiving module is further configured to receive the third message (Msg3) returned based on the random access parameter;

the determination module further configured to: in response to a failure to decode the third message (Msg3), determining a second number of retransmissions of the third message (Msg3) based on the received power of the random access request.

In one embodiment, the first sending module is further configured to:

In one embodiment, the first determining module is further configured to:

According to a fourth aspect of the embodiments of the present disclosure, there is provided an apparatus for non-terrestrial network (NTN) random access, which is applied to a terminal, wherein the apparatus includes a second receiving module, wherein,

the second receiving module is configured to receive a plurality of random access responses;

In one embodiment, the second receiving module is further configured to: the random access parameter comprises at least one of the following:

timing Advance (TA);

a time-frequency resource parameter of the third message (Msg 3);

a temporary cell radio network temporary identity (TC-RNTI);

a first number of retransmissions of the third message (Msg 3).

In one embodiment, the apparatus further comprises a second transmitting module, wherein the second transmitting module is configured to:

In one embodiment, the apparatus further comprises a second determining module, wherein the second determining module is configured to:

In one embodiment, the second determination module is further configured to:

determining the estimated Time Advance (TA) from the distance.

In one embodiment, the apparatus further comprises an acquisition module; wherein,

the acquisition module configured to: obtaining ephemeris data of the access equipment based on the received pilot signal transmitted by the access equipment;

the second determination module configured to: and determining the position information of the access equipment and the central position information of the wave beam of the access equipment according to the ephemeris data.

In one embodiment, the second receiving module is further configured to:

In one embodiment, the second sending module is further configured to:

In one embodiment, the second receiving module is further configured to:

According to a fifth aspect of embodiments of the present disclosure, there is provided an apparatus, comprising:

a processor;

a memory for storing the processor-executable instructions;

wherein the processor is configured to: when the executable instructions are executed, the method of any embodiment of the present disclosure is implemented.

According to a sixth aspect of embodiments of the present disclosure, there is provided a computer storage medium storing a computer-executable program which, when executed by a processor, implements the method of any of the embodiments of the present disclosure.

In the embodiment of the disclosure, a plurality of random access responses are issued in response to receiving a plurality of random access requests carrying the same random access lead code; wherein at least one random access parameter carried by the plurality of random access responses has different parameter values; and the different random access parameter values are used for responding to a subsequent random access process by the random access. Thus, after receiving the multiple random access responses carrying the parameter values of different random accesses, different terminals can select different random access responses and perform random access by using the random access parameters carried by the random access responses. In this embodiment, since the different terminals use different values of the random access parameter for random access, the terminals may access the network at the same time, compared to the case where different terminals use the same random access parameter for the same random access response. The network side can realize the transmission control of the random access message in the subsequent random access process by the terminal according to the random access parameter value used in the random access process after the random access request, thereby reducing the collision in the subsequent random access process and further improving the access success rate and the access efficiency of the random access by the terminal.

Drawings

Fig. 1 is a schematic structural diagram of a wireless communication system according to an exemplary embodiment.

Fig. 2 is a diagram illustrating a random access method according to an exemplary embodiment.

Fig. 3a is a diagram of random access preamble detection provided in accordance with an example embodiment.

Fig. 3b is a diagram of random access preamble detection provided in accordance with an example embodiment.

Fig. 4 is a flowchart of a method of random access provided in accordance with an example embodiment.

Fig. 5 is a flowchart of a method of random access provided in accordance with an example embodiment.

Fig. 6a is a flowchart of a method of random access provided according to an example embodiment.

Fig. 6b is a flowchart of a method of random access according to an example embodiment.

Fig. 7 is a flowchart of a method of random access provided in accordance with an example embodiment.

Fig. 8 is a flowchart of a method of random access provided in accordance with an example embodiment.

Fig. 9 is a flowchart of a method of random access provided in accordance with an example embodiment.

Fig. 10a is a flowchart of a method of random access provided according to an example embodiment.

FIG. 10b is a flowchart of a method for random access according to an example embodiment

Fig. 11a is a flowchart of a method of random access provided in accordance with an example embodiment.

Fig. 11b is a flowchart of a method of random access provided in accordance with an example embodiment.

Fig. 12 is a flowchart of a method of random access provided in accordance with an example embodiment.

Fig. 13 is a flowchart of a method of random access provided in accordance with an example embodiment.

Fig. 14 is a flowchart of a method of random access provided in accordance with an example embodiment.

Fig. 15 is a flowchart of a method of random access provided in accordance with an example embodiment.

Fig. 16 is a diagram illustrating an apparatus for random access according to an example embodiment.

Fig. 17 is a diagram illustrating an apparatus for random access according to an example embodiment.

Fig. 18 is a schematic structural diagram of a terminal according to an embodiment of the present disclosure.

Fig. 19 is a schematic structural diagram of a base station according to an embodiment of the present disclosure.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with embodiments of the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the disclosed embodiments, as detailed in the appended claims.

The terminology used in the embodiments of the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the embodiments of the present disclosure. As used in the disclosed embodiments and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information in the embodiments of the present disclosure, such information should not be limited by these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of embodiments of the present disclosure. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context.

For the purposes of brevity and ease of understanding, the terms "greater than" or "less than" are used herein when characterizing a size relationship. But it will be understood by those skilled in the art that: the term "greater than" also covers the meaning of "greater than or equal to," and "less than" also covers the meaning of "less than or equal to.

Referring to fig. 1, a schematic structural diagram of a wireless communication system according to an embodiment of the present disclosure is shown. As shown in fig. 1, the wireless communication system is a communication system based on a cellular mobile communication technology, and may include: a number of user equipments 110 and a number of base stations 120.

User device 110 may refer to, among other things, a device that provides voice and/or data connectivity to a user. The user equipment 110 may communicate with one or more core networks via a Radio Access Network (RAN), and the user equipment 110 may be internet of things user equipment, such as a sensor device, a mobile phone (or "cellular" phone), and a computer having the internet of things user equipment, and may be a fixed, portable, pocket, handheld, computer-included, or vehicle-mounted device, for example. For example, a Station (STA), a subscriber unit (subscriber unit), a subscriber Station (subscriber Station), a mobile Station (mobile), a remote Station (remote Station), an access point, a remote user equipment (remote), an access user equipment (access terminal), a user equipment (user terminal), a user agent (user agent), a user equipment (user device), or a user equipment (user equipment). Alternatively, user device 110 may also be a device of an unmanned aerial vehicle. Alternatively, the user device 110 may also be a vehicle-mounted device, for example, a vehicle computer with a wireless communication function, or a wireless user device externally connected to the vehicle computer. Alternatively, the user device 110 may be a roadside device, for example, a street lamp, a signal lamp or other roadside device with a wireless communication function.

The base station 120 may be a network side device in a wireless communication system. The wireless communication system may be a fourth generation mobile communication (4G) system, which is also called a Long Term Evolution (LTE) system; alternatively, the wireless communication system may be a 5G system, which is also called a new air interface system or a 5G NR system. Alternatively, the wireless communication system may be a next-generation system of a 5G system. Among them, the Access Network in the 5G system may be referred to as NG-RAN (New Generation-Radio Access Network, New Generation Radio Access Network).

The base station 120 may be an evolved node b (eNB) used in a 4G system. Alternatively, the base station 120 may be a base station (gNB) adopting a centralized distributed architecture in the 5G system. When the base station 120 adopts a centralized distributed architecture, it generally includes a Centralized Unit (CU) and at least two Distributed Units (DUs). A Packet Data Convergence Protocol (PDCP) layer, a Radio Link layer Control Protocol (RLC) layer, and a Media Access Control (MAC) layer are provided in the central unit; a Physical (PHY) layer protocol stack is disposed in the distribution unit, and the embodiment of the present disclosure does not limit the specific implementation manner of the base station 120.

The base station 120 and the user equipment 110 may establish a radio connection over a radio air interface. In various embodiments, the wireless air interface is based on a fourth generation mobile communication network technology (4G) standard; or the wireless air interface is based on a fifth generation mobile communication network technology (5G) standard, for example, the wireless air interface is a new air interface; alternatively, the wireless air interface may be a wireless air interface based on a 5G next generation mobile communication network technology standard.

In some embodiments, an E2E (End to End) connection may also be established between user devices 110. Scenarios such as V2V (vehicle to vehicle) communication, V2I (vehicle to Infrastructure) communication, and V2P (vehicle to vehicle) communication in vehicle networking communication (V2X).

Here, the user equipment described above may be regarded as the terminal equipment of the following embodiments.

In some embodiments, the wireless communication system may further include a network management device 130.

Several base stations 120 are connected to the network management device 130, respectively. The network Management device 130 may be a Core network device in a wireless communication system, for example, the network Management device 130 may be a Mobility Management Entity (MME) in an Evolved Packet Core (EPC). Alternatively, the Network management device may also be other core Network devices, such as a Serving GateWay (SGW), a Public Data Network GateWay (PGW), a Policy and Charging Rules Function (PCRF), a Home Subscriber Server (HSS), or the like. The implementation form of the network management device 130 is not limited in the embodiment of the present disclosure.

To facilitate an understanding of any embodiment of the present disclosure, first, a Non-Terrestrial Network (NTN) will be described.

Non-terrestrial networks (NTNs) may be used as a complement to terrestrial networks to provide continuity services for Machine-to-Machine (M2M) communication devices, Internet Of Things (IoT) devices, mobility platform users, and so on. So that the reliability of the fifth generation mobile communication (5G) network is enhanced. Or by directly providing broadcast or multicast services to user equipment at the edge of the network, the scalability of a fifth generation mobile communication (5G) network is enhanced. And the system can also be operated independently to provide unique services for remote areas, islands and the like, so that network services are ubiquitous. Compared with a typical fifth-generation mobile communication (5G) network, the satellite-ground converged non-terrestrial network (NTN) or the single non-terrestrial network (NTN) has a large influence on the coverage, user bandwidth, system capacity, service reliability or service availability, energy consumption, connection density and other performances, can provide a more reliable consistent service experience for users, reduces the network deployment cost of operators, and is capable of connecting air, sky, ground and sea multidimensional spaces to form an integrated ubiquitous network layout.

Compared to a terrestrial network, a non-terrestrial network (NTN) network has the following characteristics. First, a non-terrestrial network (NTN) generally has a larger Round Trip Time (RTT) than the signal transmission of a terrestrial fifth generation mobile communication (5G) network because both communication parties are far away. For example, in TR38.821, based on scenario a of geosynchronous orbiting satellite (GEO), the maximum Round Trip Time (RTT) reaches 541.46 ms. Secondly, a single cell has a larger coverage area due to a wide satellite beam coverage in a non-terrestrial network (NTN). For example, in TR38.821, based on scenario a of geosynchronous orbit satellite (GEO), the satellite beam diameter can reach 3500Km at maximum. Finally, the non-terrestrial network (NTN) has the following channel transmission characteristics: 1. the user differential delay in the same cell is large, and the large beam coverage area causes large differential delay. For example, when the diameter of a beam of a geosynchronous orbit satellite (GEO) satellite is 3500Km, the differential time delay can reach 10.3 ms; the beam diameter of the non-geosynchronous orbit satellite is 200Km, and the differential time delay is 0.65 ms; 2. the multipath delay spread is small, and the multipath delay spread of the radio wave propagation is obviously smaller than that of a ground network due to the large elevation angle of the satellite mobile communication system.

Random access, as the first step in a user's access to network services, has an indispensable significance in both non-terrestrial networks (NTN) and terrestrial networks. Random access processes in a New air interface (NR) network on the ground include two types, one type is a contention-based random access process including four steps, and the other type is a contention-free random access process including two steps. In a new air interface (NR), a contention-based random access procedure is used to provide uplink synchronization and scheduling requests, and a random result procedure in a non-terrestrial network (NTN) is also required to provide similar functionality.

Four-step random access procedure in a new air interface (NR) as shown in fig. 2, a plurality of terminals may simultaneously perform a random access procedure and may use the same random access resource. Since the Random Access preamble sequence (preamble) and Physical Random Access Channel (PRACH) resources are limited, multiple terminals may perform a Random Access procedure using the same preamble sequence (preamble) and Physical Random Access Channel (PRACH) resources, resulting in Random Access collision. When receiving a first message (Msg1) including a preamble sequence (preamble), the network side may not recognize that a random access collision has occurred to multiple terminals. Responding to the received preamble sequence (preamble), the Network side issues a Random Access Response (RAR), where the RAR includes an uplink grant signaling (UL-grant) used by the terminal to send a third message (Msg3) and a Temporary Cell-Radio Network Temporary Identifier (TC-RNTI) used to identify the identity of the terminal in the Network. When the network side sends the Random Access Response (RAR), the network side does not know that a plurality of terminals all send the same preamble sequence (preamble), so that the uplink grant signaling (UL-grant) and the temporary cell radio network temporary identifier (TC-RNTI) indicated in the Random Access Response (RAR) are not specific to a certain terminal, and the terminals sending the preamble sequence (preamble) in the first message (Msg1) can use the uplink grant signaling (UL-grant) to transmit the third message (Msg3), so that the third message (Msg3) collides. In the four-step random access procedure of the new air interface (NR), random access collisions are resolved in the third and fourth steps, eventually only a maximum of 1 user can be allowed to access successfully.

The message transmitted in the random access procedure may be referred to as a random access message. For example, for the 4-step random access procedure, the first message to the fourth message are involved, and the first message to the fourth message may be collectively referred to as a random access message.

For another example, for a 2-step random access procedure, message a and message B are involved, and may also be referred to as random access messages.

The first message and message a may also be referred to herein as a random access request.

Compared with the terrestrial network, a non-terrestrial network (NTN) link has the characteristics that the differential delay between users is large and the multipath delay spread of the same user is small, and when a first message (Msg1) including a preamble sequence (preamble) is received, the network side performs preamble sequence (preamble) detection to easily identify a preamble sequence (preamble) collision between multiple users, as shown in fig. 3a and 3 b. Compared with the random access process of a ground network, a non-terrestrial network (NTN) network has the characteristics of long Round Trip Time (RTT) and large cell coverage area, so that a random access process needs a long Time and a large number of users performing random access simultaneously, and the probability of random access collision should be reduced as much as possible, thereby reducing the access delay of the users and ensuring the access success rate of the users. There is therefore a need for enhancing the random access method in combination with non-terrestrial network (NTN) link characteristics to improve the access success rate of the user and the access capacity of the system.

If a random access mechanism in a new air interface (NR) is directly adopted by a non-terrestrial network (NTN), the following two problems exist: 1. due to the large Round Trip Time (RTT), the time required for a user to perform random access each time is long, so that the access success rate of the user should be ensured as much as possible, and the random access performed by the user again is reduced or avoided, so that multiple users are allowed to achieve successful access at the same time as much as possible, thereby improving the random access capacity. In some cases, two or more terminals may simultaneously use the same resource to perform their random access procedure, and in the existing random access mechanism of the new air interface (NR), only 1 user at most can successfully access, and other terminals which fail to complete the random access procedure may have to perform their random access procedure again. Because of the long time required for random access, failure to complete the random access procedure successfully may result in inefficient random access and even access failure. 2. Because the cell range is enlarged, the number of potential users performing random access simultaneously is large, the probability of random access collision among the users is larger, and the probability of success of random access is reduced.

As shown in fig. 4, the present embodiment provides a method for non-terrestrial network (NTN) random access, which is applied to an access device, where the method includes:

step 41, responding to a plurality of received random access requests carrying the same random access lead code, issuing a plurality of random access responses;

wherein at least one random access parameter carried by the plurality of random access responses has different parameter values; and different random access parameter values are used for responding to the subsequent random access process by random access.

Here, the access device of the non-terrestrial network (NTN) may be a satellite or a drone. Here, the satellite or drone may be a base station in flight. The base station may be an interface device for the terminal to access the network. Here, the base station may be various types of base stations, for example, a base station of a third generation mobile communication (3G) network, a base station of a fourth generation mobile communication (4G) network, a base station of a fifth generation mobile communication (5G) network, or other evolved base stations.

Here, the satellite may be a Low Earth Orbit (LEO) satellite. As the satellite wireless communication network evolves, the satellite may also be a Medium Earth Orbit (MEO) satellite or a Geostationary Earth Orbit (GEO) satellite.

In one embodiment, the satellite may be deployed in an airspace with a low density of ground base stations and a poor wireless communication environment. For example, the remote mountainous area is in the airspace and the ocean is in the airspace.

The terminal initiating the random access may be, but is not limited to, a mobile phone, a wearable device, a vehicle-mounted terminal, a Road Side Unit (RSU), a smart home terminal, an industrial sensing device, and/or a medical device.

The terminal may be a multi-mode terminal, which may be a terminal that supports both wireless communication with a satellite and wireless communication with a base station.

In one embodiment, the random access procedure may be a contention-based random access procedure, and multiple terminals may simultaneously send random access requests carrying the same random access preamble (preamble) to the access device. For example, at time a, terminal 1 sends a first random access request carrying a preamble a to the access device, and terminal 2 sends a second random access request carrying the preamble a to the access device. Here, it should be noted that the preamble a may be randomly selected by the terminal 1 and the terminal 2 from a plurality of preambles corresponding to the contention based random access.

In one embodiment, each terminal sends a random access request when the access device receives the random access request, and the random access request corresponds to a correlation peak. Here, since the terminal has a large differential delay and a small multipath delay spread with respect to an access device of a non-terrestrial network (NTN), and corresponding positions between correlation peaks are not overlapped, the base station may detect and identify correlation peaks corresponding to random access requests transmitted by a plurality of terminals when performing random access detection.

Here, based on the received correlation peak, a power and/or a Timing Advance (TA) of the random access preamble may be determined. The power of the random access preamble is determined according to the peak value of the correlation peak, and the power of the random access preamble is used for the terminal to adjust the power for sending the uplink data. The Timing Advance (TA) is used for uplink synchronization between the terminal and the access device.

In one embodiment, in performing random access preamble detection, it is determined that multiple random access requests carrying the same random access preamble code are received in response to detecting and identifying multiple correlation peaks within a detection window of the random access preamble code.

In one embodiment, when random access preamble (preamble) detection is performed, in response to detecting that the power of the random access preamble of the correlation peak parameter is greater than a set strength threshold, it is determined that multiple random access requests carrying the same random access preamble are received.

In one embodiment, M terminals simultaneously send random access requests to an access device, and the access device receives N random access requests carrying the same random access preamble. Here, M is equal to or greater than N, and M, N is a positive integer.

In one embodiment, the parameter value for random access may be a Time Advance (TA) value. When detecting the random access preamble (preamble), the values of the corresponding Timing Advance (TA) may be calculated according to a plurality of correlation peaks detected and identified in a detection window of the random access preamble (preamble). For example, if the number of detected and identified correlation peaks is N, N values of Timing Advance (TA) may be calculated accordingly.

In one embodiment, the terminal may select a value of a Timing Advance (TA) from values of N Timing Advances (TAs) determined according to multiple correlation peaks to perform uplink synchronization adjustment between the terminal and the access device.

In one embodiment, a medium access control payload (MAC payload) of a Random Access Response (RAR) carries 12-bit (bits) Timing Advance (TA) information, and a value of the TA is in a range from 0 to 3846. And adjusting the uplink transmission time Nta according to a Time Advance (TA) value carried in the Random Access Response (RAR), wherein the Nta is TA 16 and the value is always positive.

In one embodiment, multiple random access responses carrying different values of Timing Advance (TA) are issued. The terminal analyzes a plurality of different Time Advance (TA) values from a plurality of random access responses, and selects one TA value from the plurality TA values as the TA value for adjusting uplink synchronization. Here, the random access response corresponding to the selected value of the Timing Advance (TA) is a random access response for performing a subsequent random access procedure. Here, the subsequent random access procedure includes the terminal transmitting the third message (Msg3) using the random access parameter included in the determined Random Access Response (RAR).

In one embodiment, a value of the Timing Advance (TA) having the smallest difference from the estimated Timing Advance (TA) may be selected from the plurality of values of the Timing Advance (TA) as the value of the Timing Advance (TA) for adjusting uplink synchronization. Therefore, when the uplink synchronization between the terminal and the access equipment is carried out by using the selected Timing Advance (TA), the synchronization is more accurate, and the reliability of data transmission is improved.

In one embodiment, the random access parameters include, but are not limited to: and the parameters of the time-frequency resources used by the random access messages in the random process after the random access request is carried out.

In another embodiment, the random access parameters may further include: and the parameter of the sequence resource used in the random access process after the random access request is carried out. Sequence resources include, but are not limited to: temporary identifiers that identify random access procedures for different terminals, etc.

In yet another embodiment, the random access parameters further include: and enhancing parameters of random access messages in the random access process after the random access request is carried out. The enhancement parameters may be used to enhance various gains, such as temporal gain, spatial gain, and/or frequency domain gain.

Different random access responses carry different values of time-frequency resource parameters. Therefore, when the terminal selects different random access responses to perform the subsequent random access process, different time-frequency resources can be used for data transmission, and therefore interference during data transmission can be reduced. In one embodiment, transmitting the data may be sending a third message (Msg3) using random access parameters included in the Random Access Response (RAR) after determining the Random Access Response (RAR).

In one embodiment, the random access parameter may be a temporary cell radio network temporary identity (TC-RNTI). The different random access responses carry different temporary cell radio network temporary identities (TC-RNTIs). In this way, the terminal can use different temporary cell radio network temporary identities (TC-RNTIs) when selecting different random access responses for a subsequent random access procedure. Different temporary cell radio network temporary identifications (TC-RNTIs) are used, so that different terminals can access the network successfully, and the random access capacity is improved.

In one embodiment, the third message (Msg3) may be scrambled with a temporary cell radio network temporary identity (TC-RNTI). Here, the temporary cell radio network temporary identity (TC-RNTI) is used to identify the identity of the terminal. In this way, the access device may descramble the third message (Msg3) using the temporary cell radio network temporary identity (TC-RNTI) to determine that the third message (Msg3) is the third message (Msg3) sent by the terminal.

In the embodiment of the present disclosure, after receiving the plurality of random access responses carrying different values of the random access parameter, different terminals may select different random access responses and perform random access using the random access parameter carried in the random access response. In this embodiment, since the different terminals use different values of the random access parameter for random access, the terminals may access the network at the same time, compared to the case where different terminals use the same random access parameter for the same random access response. The network side can realize the transmission control of the random access message in the subsequent random access process by the terminal according to the random access parameter value used in the random access process after the random access request, thereby reducing the collision in the subsequent random access process and further improving the access success rate and the access efficiency of the random access by the terminal.

In one embodiment, the random access parameter is associated with a third message (Msg3) in a random access procedure.

In an embodiment, after the terminal receives multiple Random Access Responses (RARs) sent by the access device, one Random Access Response (RAR) may be determined based on one random access parameter carried by the Random Access Response (RAR) for performing a subsequent random access procedure.

The random access response here may be a second message or message B in the random access procedure.

In one embodiment, the sending of the third message (Msg3) is performed by using a plurality of random access parameters carried by the determined Random Access Response (RAR). For example, one Random Access Response (RAR) may be determined based on a Timing Advance (TA) carried by the Random Access Response (RAR), and the third message (Msg3) may be sent by using the Timing Advance (TA), the time-frequency resource parameter, and the temporary cell radio network temporary identifier (TC-RNTI) carried by the Random Access Response (RAR).

In one embodiment, the random access parameters include at least one of:

timing Advance (TA);

a time-frequency resource parameter of the third message (Msg 3);

a temporary cell radio network temporary identity (TC-RNTI);

a first number of retransmissions of the third message (Msg 3).

In one embodiment, when detecting the random access preamble (preamble), the values of the corresponding Timing Advance (TA) may be respectively calculated according to a plurality of correlation peaks detected and identified in a detection window of the random access preamble (preamble). Due to the large differential delay and small multipath delay spread in data transmission in a non-terrestrial network (NTN), the Timing Advance (TA) corresponding to different random access preamble codes (preambles) will be different. Here, the different Timing Advance (TA) may be carried in different Random Access Responses (RARs), respectively. In this way, after the terminal receives the different Random Access Responses (RARs), the different Timing Advance (TA) can be analyzed from the different Random Access Responses (RARs), and one of the plurality of different Timing Advance (TA) can be selected to perform uplink synchronization between the terminal and the access device.

In one embodiment, the time-frequency resource parameter of the third message (Msg3) may be carried by uplink grant signaling (UL-grant). The terminal sends a third message (Msg3) using the time-frequency resource. Here, because the time-frequency resource parameters carried by different Random Access Responses (RARs) are different, different terminals can select the time-frequency resource parameters corresponding to different Random Access Responses (RARs) for data transmission, and because the time-frequency resource parameters carried by different Random Access Responses (RARs) are different, interference caused by different terminals during data transmission can be reduced.

In one embodiment, the first number of retransmissions of the third message (Msg3) includes, but is not limited to, a maximum number of retransmissions of the third message (Msg3) in one random access procedure.

In another embodiment, the first number of retransmissions of the third message (Msg3) includes, but is not limited to, one or more alternative numbers of retransmissions of the third message (Msg3) in a random access procedure.

In one embodiment, when the terminal makes a retransmission of the third message (Msg3) with the first number of retransmissions, the terminal stops retransmitting the third message (Msg3) when the retransmission of the third message (Msg3) within the first number of retransmissions is successful. In one embodiment, when the terminal retransmits the third message (Msg3) using the first number of retransmissions, the terminal also stops retransmitting the third message (Msg3) when it fails to retransmit the third message (Msg3) within the first number of retransmissions.

As shown in fig. 5, in this embodiment, a method for random access is provided, where the method further includes:

step 51, receiving a third message (Msg3) returned based on the random access parameter;

and step 52, in response to the failure of the decoding of the third message (Msg3), determining a second retransmission number of the third message (Msg3) according to the received power of the random access request.

In one embodiment, the second number of retransmissions of the third message (Msg3) at the time of the failure of the terminal to send the third message (Msg3) may be determined according to a detection power of a correlation peak of the random access preamble. Here, the third message (Msg3) may be sent to the access device according to the random access parameter of the Random Access Response (RAR) selected according to the determined Timing Advance (TA).

In one embodiment, the number of retransmissions of the third message (Msg3) is determined to be the second number of retransmissions in response to a failure of the access device to decode the third message (Msg3) in response to a detected power of a correlation peak of the random access preamble being greater than a power threshold. Here, the second number of retransmissions is the maximum number of retransmissions of the third message (Msg 3). Here, the second number of retransmissions may be 0. In one embodiment, when the terminal successfully retransmits the third message (Msg3) within the second number of retransmissions while the terminal retransmits the third message (Msg3) with the second number of retransmissions, the retransmission of the third message (Msg3) is stopped. In one embodiment, when the terminal fails to retransmit the third message (Msg3) within the second number of retransmissions while the terminal is retransmitting the third message (Msg3) with the second number of retransmissions, the retransmission of the third message (Msg3) is also stopped.

In one embodiment, in response to a detected power of a correlation peak of the random access preamble code being less than a power threshold, determining a number of retransmissions of the third message (Msg3) as a first number of retransmissions upon a failure of the access device to decode the third message (Msg 3); wherein the first number of retransmissions is greater than the second number of retransmissions. Here, the first retransmission number is the maximum number of times the third message (Msg3) is retransmitted.

Here, compared with the terrestrial network, since the non-terrestrial network (NTN) has the characteristics of direct-view path propagation and long-distance transmission, and the channel propagation condition and the change of the relative displacement of the user are both small, the terminal can more accurately determine the transmission power of the random access request of the random access preamble, so that the corresponding received powers of the terminals in the same cell reaching the access device are almost equal.

In one embodiment, in a non-terrestrial network (NTN), when a network side is detecting a correlation peak of a random access preamble (preamble), if a detected power of a certain correlation peak is higher than a power threshold, it may be considered that there are multiple terminals transmitting using the same random access preamble (preamble). That is, strong interference exists between users whose Timing Advance (TA) selected by the terminal is the Timing Advance (TA) corresponding to the correlation peak. The access device records the Timing Advance (TA) corresponding to the correlation peak and then indicates in a first Random Access Response (RAR) sent for the first time, which enables mapping of the outlier peak to a first set of Random Access Responses (RAR) to identify the number of retransmissions of the third message (Msg3) associated with the detected correlation peak.

In one embodiment, if the correlation peak strength is smaller than the power threshold, it is determined that there is no strong interference for the terminal whose selected Timing Advance (TA) is the timing advance TA corresponding to the correlation peak, and then the Timing Advance (TA) value corresponding to the correlation peak is indicated in a second Random Access Response (RAR) sent next.

Here, since it is difficult to achieve successful decoding of the third message (Msg3) even if the third message (Msg3) is retransmitted a plurality of times in the presence of strong interference, the first Random Access Response (RAR) corresponds to a smaller second retransmission number set by the access device or no retransmission is performed; the second Random Access Response (RAR) corresponds to a first number of retransmissions set by the access device in the absence of strong interference.

As shown in fig. 6a, in this embodiment, a method for random access is provided, where the method further includes:

and step 61, retransmitting the random access response carrying the second retransmission times.

In one embodiment, the random access response carrying the second number of retransmissions is retransmitted upon failure of the access device to decode the third message (Msg 3).

In one embodiment, after the terminal receives the random access response carrying the second number of retransmissions, a retransmission of the third message (Msg3) is performed based on the second number of retransmissions.

In one embodiment, the second retransmission number is the maximum number of retransmissions of the third message (Msg3), and the terminal stops the retransmission of the third message (Msg3) if the retransmission is not successful after the retransmission of the third message (Msg3) with the second retransmission number. In one embodiment, if the terminal successfully retransmits the third message (Msg3) within the second number of retransmissions, the retransmission of the third message (Msg3) is also stopped.

Here, the first number of retransmissions is greater than the second number of retransmissions. Here, the second number of retransmissions may be 0.

In one embodiment, the first number of retransmissions is determined based on a received power of the random access request. When the received power is less than the power threshold, the retransmission times of the terminal transmission data can be set as the first retransmission times. Here, different received powers may correspond to different numbers of first retransmissions. For example, when the received power is P1, the first retransmission number is set to N1. When the received power is P2, the first retransmission number is set to N2. Here, P1> P2, N1< N2. Therefore, different first retransmission times are set according to different receiving powers, unnecessary retransmission times can be reduced, and the random access success rate is improved.

In one embodiment, the second number of retransmissions is determined based on the received power of the random access request. When the received power is greater than the power threshold, the retransmission times of the terminal transmission data can be set as the second retransmission times. Here, different second retransmission times may be set correspondingly to different received powers. For example, when the received power is P3, the second retransmission number is set to N3. When the received power is P4, the second retransmission number is set to N4. Here, P3> P4, N3< N4. Therefore, different second retransmission times are set according to different receiving powers, unnecessary retransmission times can be reduced, and the random access success rate is improved.

In one embodiment, referring to fig. 6b, a method for determining retransmission times is shown, the method comprising:

step a1, the access device performs power detection of random access preamble (preamble).

Step a2, judging whether the peak value of the abnormal power value occurs in the relevant peak corresponding to the random access preamble (preamble); if so, go to step a 3; otherwise, step a4 is performed.

Step a3, recording the Time Advance (TA) corresponding to the correlation peak, and indicating the time advance in a first Random Access Response (RAR) sent for the first time, where the first Random Access Response (RAR) corresponds to the second retransmission times.

Step a4, recording the Time Advance (TA) corresponding to the correlation peak, and indicating the Time Advance (TA) in a retransmitted second Random Access Response (RAR), where the second Random Access Response (RAR) corresponds to the first retransmission number. Here, the first number of retransmissions is greater than the second number of retransmissions. Here, the first number of retransmissions and the second number of retransmissions are used for the retransmission of the third message (Msg 3).

As shown in fig. 7, in this embodiment, a method for random access is provided, where the method further includes:

step 71, issuing configuration information, wherein the configuration information at least comprises: desired power information indicating a desired received power of the random access request.

In one embodiment, the expected received power may be a received power at which the access device has a success rate for decoding data transmitted by the terminal that is greater than a set threshold. After the access device sends the expected power information to the terminal, the terminal determines the sending power based on the expected power information and sends data based on the sending power.

In one embodiment, it may be the terminal that determines the transmit power based on the power loss and the expected received power during data transmission. For example, if the expected received power of the random access request indicated by the configuration information is a and the power loss during data transmission is B, the access device may determine that the transmission power is the sum of a and B.

In one embodiment, the access device may be the configuration information sent to the terminal in a unicast manner. In another embodiment, the access device may send the configuration information to the terminal in a broadcast manner.

In one embodiment, the configuration information may be sent to the terminal when the terminal is in a Radio Resource Control (RRC) connected state or in a Radio Resource Control (RRC) disconnected state. For a terminal in a Radio Resource Control (RRC) connected state, the access device may send the configuration Information to each terminal through a system message, a Radio Resource Control (RRC) signaling, or a Downlink Control Information (DCI) signaling. For terminals in a Radio Resource Control (RRC) non-connected state, the access device may send the configuration information to the terminals via system messages. Therefore, multiplexing of Radio Resource Control (RRC) signaling, system information or downlink control information and the like is realized, and the compatibility of the signaling is improved.

As shown in fig. 8, in this embodiment, a method for random access is provided, where the method further includes:

step 81, responding to the received power according to multiple random access requests, determining whether multiple random access requests carrying the same random access preamble code are received.

In one embodiment, at the time of preamble detection, in response to detecting that the power of the random access preamble carrying the correlation peak parameter is greater than a set strength threshold, it is determined that multiple random access requests carrying the same random access preamble are received.

In one embodiment, the determining whether multiple random access requests carrying the same random access preamble code are received in response to the received power according to the multiple random access requests comprises at least one of:

and responding to the difference between the received power and the power threshold value according to the plurality of random access requests, and determining whether a plurality of random access requests carrying the same random access preamble code are received.

In one embodiment, the peak correlation may be such that correlation peaks of received power of random access requests detected in the same detection window are independent of each other.

In one embodiment, when performing the power detection of the preamble, in response to performing the received power detection in the detection window of the random access preamble (preamble) and identifying a plurality of received power correlation peaks, since the plurality of received power correlation peaks are independent of each other, it may be determined that a plurality of random access requests carrying the same random access preamble are received.

In one embodiment, when performing power detection of a preamble, it may be determined that a plurality of random access requests carrying the same random access preamble are not received in response to performing received power detection within a detection window of the random access preamble but not identifying a plurality of received power correlation peaks.

In one embodiment, when performing preamble power detection, in response to detecting that the power of a received power correlation peak is greater than a set strength threshold, it is determined that multiple random access requests carrying the same random access preamble are received.

In one embodiment, in performing preamble power detection, in response to detecting that the power of a received power correlation peak is less than a set strength threshold, it may be determined that multiple random access requests carrying the same random access preamble are not received.

As shown in fig. 9, the present embodiment provides a method for non-terrestrial network (NTN) random access, which is applied to a terminal, where the method includes:

step 91, receiving a plurality of random access responses, wherein at least one random access parameter carried by the plurality of random access responses has different parameter values;

wherein, different random access parameters are used for responding the subsequent random access process by random access.

In one embodiment, the random access parameter value may be a Time Advance (TA) value. When detecting the random access preamble (preamble), the values of the corresponding Timing Advance (TA) may be calculated according to a plurality of correlation peaks detected and identified in a detection window of the random access preamble (preamble). For example, if the number of detected and identified correlation peaks is N, N values of Timing Advance (TA) may be calculated accordingly.

In one embodiment, the random access parameters include, but are not limited to: may be a parameter value of a time-frequency resource used by the random access message in a random process after the random access request is made.

In one embodiment, the random access parameters include at least one of:

timing Advance (TA);

a time-frequency resource parameter of the third message (Msg 3);

a temporary cell radio network temporary identity (TC-RNTI);

a first number of retransmissions of the third message (Msg 3).

As shown in fig. 10a, the present embodiment provides a method for random access, where the method further includes:

step 101, sending a third message (Msg3) in the random access process according to the random access parameters matching the Time Advance (TA) carried by the multiple random access responses with the estimated Time Advance (TA) of the terminal.

In one embodiment, a terminal using the same random access preamble receives N Random Access Responses (RAR), decodes each Random Access Response (RAR), and obtains N different Timing Advance (TA) values, which are denoted as { TA1, TA2, …, TA N }. The terminal compares the different Time Advance (TA) values (namely TA i) obtained by decoding with the estimated Time Advance (TA) values respectively, selects the Time Advance (TA) value closest to the estimated Time Advance (TA) and takes the Time Advance (TA) value as the on-Time Advance (TA) of the terminal.

In one embodiment, if the difference between the on-Time Advance (TA) and the estimated Time Advance (TA) is smaller than a set time threshold, the terminal determines the on-Time Advance (TA) value as a target Time Advance (TA) value, determines a Random Access Response (RAR) associated with the target Time Advance (TA) value as a target Random Access Response (RAR), and transmits a third message (Msg3) in the random access process by using the target Random Access Response (RAR).

In one embodiment, if the difference between the on-Time Advance (TA) and the estimated Time Advance (TA) is greater than the time threshold, the terminal does not process the Time Advance (TA) value in the Random Access Response (RAR) and does not send the third message (Msg3), so that the interference when the terminal sends the third message (Msg3) can be reduced, and the decoding success rate of the third message (Msg3) of the terminal is increased.

In one embodiment, referring to fig. 10b, the Random Access Response (RAR) can be determined by:

step (ii) ofb1, the terminal respectively compares the timing advance TA1, TA2 and … TAN decoded from n Random Access Responses (RAR) with the estimated timing advance TA_XAnd comparing, and taking TAm with the minimum value of the TAi-TAx as the time advance TA of the terminal.

Step b2, judging whether the minimum value of the absolute value TAi-TAx is smaller than a set threshold value; when less than the set threshold, performing step b 3; otherwise step b5 is executed.

Step b3, determining TAm as a target timing advance TA, and determining a Random Access Response (RAR) associated with the target timing advance TA as a target Random Access Response (RAR); step b4 is performed.

And step b4, sending a third message (Msg3) by using the random access parameters carried by the target Random Access Response (RAR).

Step b5, the on-time advance TA is invalid, and the target time advance TA and the target Random Access Response (RAR) cannot be determined.

As shown in fig. 11a, the present embodiment provides a method for random access, where the method further includes:

step 111, determining the estimated Time Advance (TA) according to the first location information when the access device sends the pilot signal and the second location information when the terminal receives the pilot signal.

In one embodiment, the first position information of the transmitted pilot signal may be position information of a position of a transmission point of a transmission beam on the access device, where the pilot signal is transmitted.

In one embodiment, the first location information and the second location information may be represented by three-dimensional coordinates. For example, the first position information includes position coordinates a (x1, y1, z1) and the second position information includes position coordinates B (x2, y2, z 2). The distance between a and B can be expressed in terms of euclidean distance. Here, the estimated Time Advance (TA) may be determined by determining the time when the signal is transmitted between a and B through the relationship between the distance between a and B and the transmission rate of the signal.

As shown in fig. 11b, the present embodiment provides a method for random access, where the method further includes:

step 112, determining the distance between the position of the terminal and the center position of the transmission beam of the access device according to the second position information when the terminal receives the pilot signal, the third position information of the access device and the first position information of the center of the transmission beam when the access device transmits the pilot signal;

step 113, determining the estimated Time Advance (TA) according to the distance.

In one embodiment, the third location of the access device of the non-terrestrial network (NTN) is a location of a reference point on the access device. For example, the location of the reference point is the location of a positioning sensor mounted on the access device.

In one embodiment, the location between the location of the reference point on the access device and the center location of the transmit beam of the access device is fixed. Therefore, after determining the position of the reference point on the access device, the center position of the transmission beam of the access device can be determined based on the relative position relationship between the position of the reference point on the access device and the center position of the transmission wave velocity of the access device, and finally the distance between the position of the terminal and the center position of the transmission beam of the access device can be determined. An estimated Time Advance (TA) may then be determined based on the distance and the rate of signal transmission

As shown in fig. 12, in this embodiment, a method for random access is provided, where the method further includes:

step 121, obtaining ephemeris data of the access device based on the received pilot signal transmitted by the access device;

and step 122, determining the position information of the access device and the central position information of the beam of the access device according to the ephemeris data.

In one embodiment, the pilot signal carries ephemeris data of the access device, and the terminal may decode the pilot signal based on a predetermined decoding rule to obtain the ephemeris data.

In one embodiment, after the access device measures the position, the position information of the access device and the center position information of the beam of the access device are carried in ephemeris data. After acquiring the ephemeris data, the terminal can acquire the position information of the access device and the center position information of the beam of the access device according to the ephemeris data.

As shown in fig. 13, the present embodiment provides a method for random access, where the method further includes:

and step 131, receiving the retransmitted random access response, wherein the retransmitted random access response carries (Mgs3) the second retransmission times.

As shown in fig. 14, in this embodiment, a method for random access is provided, where the method further includes:

at step 141, the third message is resent (Msg3) based on the second number of retransmissions.

In one embodiment, after the terminal receives the random access response carrying the second number of retransmissions, a retransmission of the third message (Msg3) is performed based on the second number of retransmissions. In one embodiment, the second retransmission number is the maximum number of retransmissions of the third message (Msg3), and the terminal stops the retransmission of the third message (Msg3) if the retransmission is not successful after the retransmission of the third message (Msg3) with the second retransmission number. In one embodiment, if the terminal successfully retransmits the third message (Msg3) within the second number of retransmissions, the retransmission of the third message (Msg3) is also stopped.

As shown in fig. 15, the present embodiment provides a method for random access, where the method further includes:

step 151, receiving configuration information, where the configuration information at least includes: desired power information indicating a desired reception power of the random access request; wherein the random access request is transmitted at a desired power.

As shown in fig. 16, the apparatus for non-terrestrial network (NTN) random access provided in this embodiment is applied to an access device, where the apparatus includes a sending module, where the first sending module 161 is configured to:

wherein at least one random access parameter carried by the plurality of random access responses has different parameter values; different random access parameters are used for responding to the subsequent random access process by random access.

In one embodiment, the first sending module 161 is further configured to: the random access parameter is associated with a third message (Msg3) in the random access procedure.

In one embodiment, the first sending module 161 is further configured to: random access parameters including at least one of:

a Time Advance (TA) that is different for different terminals that sent the random access request to use for sending the third message (Msg 3);

time-frequency resource parameters of a third message (Msg3), wherein the time-frequency resources for transmitting the third message (Msg3) are different for uplink grant signaling (UL-grant) scheduling of different terminals sending random access requests;

a temporary cell radio network temporary identity (TC-RNTI), wherein the temporary cell radio network temporary identities (TC-RNTI) for different terminals sending random access requests are different, and the temporary cell radio network temporary identity (TC-RNTI) is carried in the Msg 3;

a first number of retransmissions of the third message (Msg 3).

In one embodiment, the apparatus further comprises a first receiving module 162 and a first determining module 163, wherein,

a first receiving module 162, further configured to receive the Msg3 returned based on the random access parameter;

a first determining module 163, further configured to: in response to a failure to decode the third message (Msg3), a second number of retransmissions of the third message (Msg3) is determined based on the received power of the random access request.

In one embodiment, the first sending module 161 is further configured to:

In one embodiment, the first determining module 163 is further configured to:

As shown in fig. 17, the present embodiment provides a non-terrestrial network (NTN) random access apparatus for a terminal, wherein the apparatus includes a second receiving module 171, wherein,

the second receiving module 171 is configured to receive a plurality of random access responses;

In one embodiment, the second receiving module 171 is further configured to: random access parameters including at least one of:

timing advance TA;

a time-frequency resource parameter of the third message (Msg 3);

a temporary cell radio network temporary identity (TC-RNTI);

a first number of retransmissions of the third message (Msg 3).

In one embodiment, the apparatus further comprises a second transmitting module 172, wherein the second transmitting module 172 is configured to:

and sending a third message (Msg3) in the random access process according to the random access parameters of which the Time Advance (TA) carried by the random access responses is matched with the estimated Time Advance (TA) of the terminal.

In one embodiment, the apparatus further comprises a second determining module 173, wherein the second determining module 173 is further configured to:

and determining the estimated Time Advance (TA) according to the first position information when the access equipment sends the pilot signal and the second position information when the terminal receives the pilot signal.

In one embodiment, among others, the second determining module 173 is further configured to:

determining the distance between the position of the terminal and the center position of the transmitting beam of the access equipment according to the second position information when the terminal receives the pilot signal, the third position information of the access equipment and the first position information of the center of the transmitting beam when the access equipment transmits the pilot signal;

an estimated Time Advance (TA) is determined based on the distance.

In one embodiment, the apparatus further comprises an acquisition module 174; wherein,

an acquisition module 174 configured to: acquiring ephemeris data of the access equipment based on the received pilot signal transmitted by the access equipment;

a second determination module 173 configured to: and determining the position information of the access equipment and the central position information of the wave beam of the access equipment according to the ephemeris data.

In one embodiment, the second receiving module 171 is further configured to:

receiving a retransmitted random access response, wherein the retransmitted random access response carries the second number of retransmissions of the third message (Msg 3).

In one embodiment, the second sending module 172 is further configured to:

and resending the third message (Msg3) according to the second number of retransmissions.

In one embodiment, the second receiving module 171 is further configured to:

receiving configuration information, wherein the configuration information at least comprises: desired power information indicating a desired reception power of the random access request; wherein the random access request is transmitted at a desired power.

With regard to the apparatus in the above-described embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment related to the method, and will not be elaborated here.

An embodiment of the present disclosure further provides a communication device, including:

an antenna;

a memory;

and the processor is respectively connected with the antenna and the memory and used for controlling the antenna to transmit and receive wireless signals by executing the executable program stored in the memory, and can execute the steps of the wireless network access method provided by any of the foregoing embodiments.

The communication device provided in this embodiment may be the aforementioned terminal or base station. The terminal can be various human-borne terminals or vehicle-borne terminals. The base stations may be various types of base stations, such as 4G base stations or 5G base stations, and so on.

The antenna may be various types of antennas, for example, a mobile antenna such as a 3G antenna, a 4G antenna, or a 5G antenna; the antenna may further include: a WiFi antenna or a wireless charging antenna, etc.

The memory may include various types of storage media, which are non-transitory computer storage media capable of continuing to remember the information stored thereon after a communication device has been powered down.

The processor may be connected to the antenna and the memory via a bus or the like for reading an executable program stored on the memory, e.g. at least one of the methods shown in any of the embodiments of the present disclosure.

The embodiments of the present disclosure further provide a non-transitory computer-readable storage medium, which stores an executable program, where the executable program, when executed by a processor, implements the steps of the wireless network access method provided in any of the foregoing embodiments, for example, at least one of the methods shown in any of the embodiments of the present disclosure.

As shown in fig. 18, one embodiment of the present disclosure provides a structure of a terminal.

Referring to the terminal 800 shown in fig. 18, the present embodiment provides a terminal 800, which may be embodied as a mobile phone, a computer, a digital broadcast terminal, a messaging device, a game console, a tablet device, a medical device, a fitness device, a personal digital assistant, and the like.

Referring to fig. 18, terminal 800 may include one or more of the following components: processing component 802, memory 804, power component 806, multimedia component 808, audio component 810, input/output (I/O) interface 812, sensor component 814, and communication component 816.

The processing component 802 generally controls overall operation of the terminal 800, such as operations associated with display, telephone calls, data communications, camera operations, and recording operations. The processing components 802 may include one or more processors 820 to execute instructions to perform all or a portion of the steps of the methods described above. Further, the processing component 802 can include one or more modules that facilitate interaction between the processing component 802 and other components. For example, the processing component 802 can include a multimedia module to facilitate interaction between the multimedia component 808 and the processing component 802.

The memory 804 is configured to store various types of data to support operation at the device 800. Examples of such data include instructions for any application or method operating on terminal 800, contact data, phonebook data, messages, pictures, videos, and so forth. The memory 804 may be implemented by any type or combination of volatile or non-volatile memory devices such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disks.

Power components 806 provide power to the various components of terminal 800. Power components 806 may include a power management system, one or more power sources, and other components associated with generating, managing, and distributing power for terminal 800.

The multimedia component 808 includes a screen that provides an output interface between the terminal 800 and the user. In some embodiments, the screen may include a Liquid Crystal Display (LCD) and a Touch Panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive an input signal from a user. The touch panel includes one or more touch sensors to sense touch, slide, and gestures on the touch panel. The touch sensor may not only sense the boundary of a touch or slide action, but also detect the duration and pressure associated with the touch or slide operation. In some embodiments, the multimedia component 808 includes a front facing camera and/or a rear facing camera. The front-facing camera and/or the rear-facing camera may receive external multimedia data when the device 800 is in an operating mode, such as a shooting mode or a video mode. Each front camera and rear camera may be a fixed optical lens system or have a focal length and optical zoom capability.

The audio component 810 is configured to output and/or input audio signals. For example, the audio component 810 includes a Microphone (MIC) configured to receive external audio signals when the terminal 800 is in an operational mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signals may further be stored in the memory 804 or transmitted via the communication component 816. In some embodiments, audio component 810 also includes a speaker for outputting audio signals.

The I/O interface 812 provides an interface between the processing component 802 and peripheral interface modules, which may be keyboards, click wheels, buttons, etc. These buttons may include, but are not limited to: a home button, a volume button, a start button, and a lock button.

Sensor assembly 814 includes one or more sensors for providing various aspects of state assessment for terminal 800. For example, sensor assembly 814 can detect the open/closed state of device 800, the relative positioning of components, such as a display and keypad of terminal 800, sensor assembly 814 can also detect a change in position of terminal 800 or a component of terminal 800, the presence or absence of user contact with terminal 800, orientation or acceleration/deceleration of terminal 800, and a change in temperature of terminal 800. Sensor assembly 814 may include a proximity sensor configured to detect the presence of a nearby object without any physical contact. The sensor assembly 814 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 814 may also include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.

Communication component 816 is configured to facilitate communications between terminal 800 and other devices in a wired or wireless manner. The terminal 800 may access a wireless network based on a communication standard, such as Wi-Fi, 2G, or 3G, or a combination thereof. In an exemplary embodiment, the communication component 816 receives a broadcast signal or broadcast related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, communications component 816 further includes a Near Field Communications (NFC) module to facilitate short-range communications. For example, the NFC module may be implemented based on Radio Frequency Identification (RFID) technology, infrared data association (IrDA) technology, Ultra Wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.

In an exemplary embodiment, the terminal 800 may be implemented by one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), controllers, micro-controllers, microprocessors or other electronic components for performing the above-described methods.

In an exemplary embodiment, a non-transitory computer-readable storage medium comprising instructions, such as the memory 804 comprising instructions, executable by the processor 820 of the terminal 800 to perform the above-described method is also provided. For example, the non-transitory computer readable storage medium may be a ROM, a Random Access Memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like.

The terminal may be configured to implement the aforementioned method, for example, the method of any of the embodiments of the present disclosure.

As shown in fig. 19, one embodiment of the present disclosure provides a structure of a base station. For example, the base station 900 may be provided as a network side device. Referring to fig. 19, base station 900 includes a processing component 922, which further includes one or more processors and memory resources, represented by memory 932, for storing instructions, such as applications, that are executable by processing component 922. The application programs stored in memory 932 may include one or more modules that each correspond to a set of instructions. Further, the processing component 922 is configured to execute instructions to perform any of the methods described above, e.g., a method as in any of the embodiments of the present disclosure.

The base station 900 may also include a power supply component 926 configured to perform power management of the base station 900, a wired or wireless network interface 950 configured to connect the base station 900 to a network, and an input/output (I/O) interface 958. The base station 900 may operate based on an operating system stored in memory 932, such as Windows Server, Mac OS XTM, UnixTM, LinuxTM, FreeBSDTM, or the like.

The wireless network interface 950 includes, but is not limited to, the antenna of the aforementioned communication device. Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice in the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.

It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.

Claims

1. A method for NTN random access of a non-terrestrial network is applied to an access device, wherein the method comprises the following steps:

2. The method of claim 1, wherein the random access parameter relates to a third message Msg3 in a random access procedure.

3. The method of claim 2, wherein the random access parameters comprise at least one of:

timing advance TA;

the time-frequency resource parameter of the Msg 3;

a temporary cell radio network temporary identifier TC-RNTI;

a first number of retransmissions of the Msg 3.

4. The method of claim 2, wherein the method further comprises:

receiving the Msg3 returned based on the random access parameters;

determining a second number of retransmissions of the Msg3 based on the received power of the random access request in response to the Msg3 decoding failure.

5. The method of claim 4, wherein the method further comprises:

6. The method of claim 4, wherein the method further comprises:

7. The method of any of claims 1 to 6, wherein the method further comprises:

8. The method of claim 7, wherein the determining whether multiple random access requests carrying the same random access preamble are received in response to the received power according to the multiple random access requests comprises at least one of:

9. An NTN random access method is applied to a terminal, wherein the method comprises the following steps:

10. The method of claim 9, wherein the random access parameters comprise at least one of:

timing advance TA;

the time-frequency resource parameter of the Msg 3;

a temporary cell radio network temporary identifier TC-RNTI;

a first number of retransmissions of the Msg 3.

11. The method of claim 9, wherein the method further comprises:

and sending the Msg3 in the random access process according to the random access parameters matched with the TA carried by the random access responses and the pre-estimated TA of the terminal.

12. The method of claim 11, wherein the method further comprises:

and determining the estimated TA according to first position information when the access equipment sends the pilot signal and second position information when the terminal receives the pilot signal.

13. The method of claim 12, wherein the determining the estimated TA according to first location information of the access device when transmitting a pilot signal and second location information of the terminal when receiving the pilot signal comprises:

and determining the pre-estimated TA according to the distance.

14. The method of claim 13, wherein the method further comprises:

15. The method of claim 10, wherein the method further comprises:

receiving a retransmitted random access response, wherein the retransmitted random access response carries the Mgs3 second retransmission times.

16. The method of claim 15, wherein the method further comprises:

resending Mgs3 based on the second number of retransmissions.

17. The method of claim 16, wherein the method further comprises:

18. An apparatus for NTN random access, wherein the apparatus comprises a first transmitting module, wherein,

the first transmitting module configured to:

19. The apparatus of claim 18, wherein the first transmitting module is further configured to: the random access parameter is associated with a third message Msg3 in the random access procedure.

20. The apparatus of claim 19, wherein the first transmitting module is further configured to: the random access parameter comprises at least one of the following:

timing advance TA;

the time-frequency resource parameter of the Msg 3;

a temporary cell radio network temporary identifier TC-RNTI;

a first number of retransmissions of the Msg 3.

21. The apparatus of claim 19, wherein the apparatus further comprises a first receiving module and a first determining module, wherein,

the first receiving module is further configured to receive the Msg3 returned based on the random access parameter;

the determination module further configured to: determining a second number of retransmissions of the Msg3 based on the received power of the random access request in response to the Msg3 decoding failure.

22. The apparatus of claim 21, wherein the first transmitting module is further configured to:

23. The apparatus of claim 21, wherein the first transmitting module is further configured to:

24. The apparatus of any of claims 18 to 23, wherein the first determining module is further configured to:

25. The apparatus of claim 24, wherein the first determining module is further configured to:

26. An apparatus for NTN random access, applied to a terminal, wherein the apparatus includes a second receiving module, wherein,

27. The apparatus of claim 26, wherein the second receiving means is further configured to: the random access parameter comprises at least one of the following:

timing advance TA;

the time-frequency resource parameter of the Msg 3;

a temporary cell radio network temporary identifier TC-RNTI;

a first number of retransmissions of the Msg 3.

28. The apparatus of claim 26, wherein the apparatus further comprises a second transmitting module, wherein the second transmitting module is configured to:

29. The apparatus of claim 28, wherein the apparatus further comprises a second determination module, wherein the second determination module is configured to:

30. The apparatus of claim 29, wherein the second determining module is further configured to:

and determining the pre-estimated TA according to the distance.

31. The apparatus of claim 30, wherein the apparatus further comprises an acquisition module; wherein,

32. The apparatus of claim 27, wherein the second receiving means is further configured to:

33. The apparatus of claim 32, wherein the second transmitting module is further configured to:

resending Mgs3 based on the second number of retransmissions.

34. The apparatus of claim 33, wherein the second receiving means is further configured to:

35. A communication device, comprising:

an antenna;

a memory;

a processor, coupled to the antenna and the memory, respectively, configured to control transceiving of the antenna by executing computer-executable instructions stored on the memory, and to enable the method provided by any of claims 1 to 8 or claims 9 to 17.

36. A computer storage medium storing computer-executable instructions capable, when executed by a processor, of implementing the method as provided in any one of claims 1 to 8 or 9 to 17.