WO2023173440A1 - Wireless communication method and apparatus, and device, storage medium and program product - Google Patents

Abstract

The present application relates to the technical field of communications. Disclosed are a wireless communication method and apparatus, and a device, a storage medium and a program product. The method comprises: a terminal device sending a PRACH format to a network device, wherein the PRACH format comprises at least one of the following: a first PRACH format comprising N repeated sequence SEQ groups, and a second PRACH format comprising M repeated PRACH sequences (601). The technical solution provided in the embodiments of the present application can improve the configuration flexibility and reliability of a PRACH, and improve the access performance of the PRACH.

Description

Wireless communication methods, devices, equipment, storage media and program products Technical field

The embodiments of the present application relate to the field of communication technology, and in particular, to a wireless communication method, device, equipment, storage medium and program product.

Background technique

In communication systems, wireless communication can be implemented based on various PRACH (Physical Random Access Channel, physical random access channel) formats.

For NTN (Non-Terrestrial Network, non-terrestrial network) system, wireless communication technology still needs further research.

Contents of the invention

Embodiments of the present application provide a wireless communication method, device, equipment, storage medium and program product. The technical solutions are as follows:

According to one aspect of the embodiments of the present application, a wireless communication method is provided, and the method includes:

The terminal device sends the PRACH format; where,

The PRACH format includes at least one of the following:

The first PRACH format including N repeated sequence SEQ groups,

A second PRACH format including M repeated PRACH sequences. According to one aspect of the embodiments of the present application, a wireless communication method is provided, and the method includes:

The network device receives the PRACH format sent by the terminal device; where,

The PRACH format includes at least one of the following:

The first PRACH format including N repeated sequence SEQ groups,

A second PRACH format including M repeated PRACH sequences. According to one aspect of the embodiment of the present application, a wireless communication device is provided, and the device includes:

Sending module, used to send PRACH format; among them,

The PRACH format includes at least one of the following:

The first PRACH format including N repeated sequence SEQ groups,

A second PRACH format including M repeated PRACH sequences. According to one aspect of the embodiment of the present application, a wireless communication device is provided, and the device includes:

The receiving module is used to receive the PRACH format sent by the terminal device; where,

The PRACH format includes at least one of the following:

The first PRACH format including N repeated sequence SEQ groups,

A second PRACH format including M repeated PRACH sequences. According to an aspect of an embodiment of the present application, a terminal device is provided. The terminal device includes a processor and a memory. A computer program is stored in the memory. The processor executes the computer program to implement the above-mentioned terminal device side. wireless communication method.

According to an aspect of an embodiment of the present application, a network device is provided. The network device includes a processor and a memory. A computer program is stored in the memory. The processor executes the computer program to implement the above-mentioned network device side. wireless communication method.

According to an aspect of an embodiment of the present application, a computer-readable storage medium is provided, in which a computer program is stored, and the computer program is used to be executed by a processor to implement the above wireless communication method on the terminal device side. , or implement the above wireless communication method on the network device side.

According to one aspect of the embodiment of the present application, a chip is provided. The chip includes programmable logic circuits and/or program instructions. When the chip is running, it is used to implement the above wireless communication method on the terminal device side, or to implement The above wireless communication method on the network device side.

According to an aspect of an embodiment of the present application, a computer program product is provided. The computer program product includes computer instructions. The computer instructions are stored in a computer-readable storage medium. A processor reads the computer-readable storage medium from the computer-readable storage medium. Obtain and execute the computer instructions to implement the wireless communication method on the terminal device side, or to implement the wireless communication method on the network device side.

The technical solutions provided by the embodiments of this application may include the following beneficial effects:

By setting the PRACH format to include N repeated SEQ groups and/or M repeated PRACH sequences, the PRACH format can be configured according to actual needs, improving PRACH configuration flexibility and reliability, and improving PRACH access performance.

Description of the drawings

Figure 1 is a schematic diagram of the system architecture provided by an embodiment of the present application;

Figure 2 is a schematic diagram of a system architecture provided by another embodiment of the present application;

Figure 3 is a schematic diagram of a system architecture provided by another embodiment of the present application;

Figure 4 is a schematic diagram of a four-step random access process provided by an embodiment of the present application;

Figure 5 is a schematic diagram of a two-step random access process provided by an embodiment of the present application;

Figure 6 is a schematic diagram of the PRACH format provided by an embodiment of the present application;

Figure 7 is a flow chart of a wireless communication method provided by an embodiment of the present application;

Figure 8 is a schematic diagram of the PRACH format provided by another embodiment of the present application;

Figure 9 is a schematic diagram of the PRACH format provided by another embodiment of the present application;

Figure 10 is a schematic diagram of the PRACH format provided by another embodiment of the present application;

Figure 11 is a schematic diagram of the PRACH format provided by another embodiment of the present application;

Figure 12 is a schematic diagram of the PRACH format provided by another embodiment of the present application;

Figure 13 is a block diagram of a wireless communication device provided by an embodiment of the present application;

Figure 14 is a block diagram of a wireless communication device provided by another embodiment of the present application;

Figure 15 is a schematic structural diagram of a terminal device provided by an embodiment of the present application;

Figure 16 is a schematic structural diagram of a network device provided by an embodiment of the present application.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present application clearer, the embodiments of the present application will be further described in detail below with reference to the accompanying drawings.

The network architecture and business scenarios described in the embodiments of this application are to more clearly explain the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions provided by the embodiments of this application. Those of ordinary skill in the art will know that with the network architecture evolution and the emergence of new business scenarios, the technical solutions provided in the embodiments of this application are also applicable to similar technical problems.

The technical solutions of the embodiments of the present application can be applied to various communication systems, such as: Global System of Mobile communication (GSM) system, Code Division Multiple Access (Code Division Multiple Access, CDMA) system, broadband code division multiple access (Wideband Code Division Multiple Access, WCDMA) system, General Packet Radio Service (GPRS), Long Term Evolution (LTE) system, Advanced long term evolution (LTE-A) system , New Radio (NR) system, evolution system of NR system, LTE (LTE-based access to unlicensed spectrum, LTE-U) system on unlicensed spectrum, NR (NR-based access to unlicensed spectrum) unlicensed spectrum, NR-U) system, non-terrestrial network (Non-Terrestrial Networks, NTN) system, universal mobile communication system (Universal Mobile Telecommunication System, UMTS), wireless local area network (Wireless Local Area Networks, WLAN), wireless fidelity ( Wireless Fidelity (WiFi), fifth-generation communication (5th-Generation, 5G) system or other communication systems, etc.

Generally speaking, traditional communication systems support a limited number of connections and are easy to implement. However, with the development of communication technology, mobile communication systems will not only support traditional communication, but also support, for example, Device to Device, D2D) communication, Machine to Machine (M2M) communication, Machine Type Communication (MTC), Vehicle to Vehicle (V2V) communication, or Vehicle to everything (V2X) communication, etc. , the embodiments of the present application can also be applied to these communication systems.

The communication system in the embodiment of this application can be applied to a carrier aggregation (Carrier Aggregation, CA) scenario, a dual connectivity (Dual Connectivity, DC) scenario, or a standalone (Standalone, SA) network deployment scenario.

The communication system in the embodiment of the present application can be applied to the unlicensed spectrum, where the unlicensed spectrum can also be considered as a shared spectrum; or the communication system in the embodiment of the present application can also be applied to the licensed spectrum, where the licensed spectrum can also be Considered a non-shared spectrum.

The embodiments of the present application can be applied to non-terrestrial network systems and can also be applied to terrestrial communication network (Terrestrial Networks, TN) systems.

Please refer to Figure 1, which shows a schematic diagram of a system architecture provided by an embodiment of the present application. The system architecture may include: network device 10 and terminal device 20.

The network device 10 is a device used to provide wireless communication services to the terminal device 20 . A connection can be established between the network device 10 and the terminal device 20 through an air interface, so that communication, including signaling and data interaction, can be performed through the connection. The number of network devices 10 may be multiple, and communication between two adjacent network devices 10 may also be carried out in a wired or wireless manner. The terminal device 20 can switch between different network devices 10 , that is, establish connections with different network devices 10 .

In an example, as shown in Figure 2, taking the NTN system as an example, the network device 10 in the NTN system may be a satellite 11. A satellite 11 can cover a certain range of ground area and provide wireless communication services to terminal devices 20 on the ground area. In addition, the satellite 11 can orbit the earth, and by deploying multiple satellites 11, communication coverage of different areas on the earth's surface can be achieved.

Compared with terrestrial cellular communication networks, satellite communications have many unique advantages. First of all, satellite communication is not restricted by the user's geographical area. For example, general land communication cannot cover areas such as oceans, mountains, deserts, etc. where communication equipment cannot be installed or where communication coverage is not available due to sparse population. However, for satellite communication, due to a satellite Satellites can cover a large area of the ground, and satellites can orbit the earth, so in theory every corner of the earth can be covered by satellite communications. Secondly, satellite communications have great social value. Satellite communications can cover remote mountainous areas and poor and backward countries or regions at a lower cost, allowing people in these areas to enjoy advanced voice communications and mobile Internet technologies, which is conducive to narrowing the digital divide with developed regions and promoting development in these areas. Thirdly, satellite communication has a long distance, and the cost of communication does not increase significantly as the communication distance increases; finally, satellite communication has high stability and is not restricted by natural disasters.

Communication satellites are divided into LEO (Low-Earth Orbit, low Earth orbit) satellites, MEO (Medium-Earth Orbit, medium Earth orbit) satellites, GEO (Geostationary Earth Orbit, geosynchronous orbit) satellites, HEO (High Earth Orbit) satellites according to different orbital altitudes. Elliptical Orbit, highly elliptical orbit) satellite, etc.

In order to ensure satellite coverage and improve the system capacity of the entire satellite communication system, satellites use multiple beams to cover the ground. One satellite can form dozens or even hundreds of beams to cover the ground; one satellite beam can cover dozens to hundreds of kilometers in diameter. Ground area.

In another example, as shown in FIG. 3 , taking a cellular communication network as an example, the network device 10 in the cellular communication network may be a base station 12 . The base station 12 is a device deployed in the access network to provide wireless communication functions for the terminal device 20 . The base station 12 may include various forms of macro base stations, micro base stations, relay stations, access points, etc. In systems using different wireless access technologies, the names of devices with network device functions may be different. For example, in 5G NR (New Radio, New Radio) systems, they are called gNodeB or gNB. As communications technology evolves, the name "base station" may change. For convenience of description, in the embodiment of the present application, the above-mentioned devices that provide wireless communication functions for the terminal device 20 are collectively referred to as network devices.

In addition, the terminal device 20 involved in the embodiment of the present application may include various handheld devices with wireless communication functions, vehicle-mounted devices, wearable devices, computing devices or other processing devices connected to wireless modems, as well as various forms of users. Equipment (User Equipment, UE), mobile station (Mobile Station, MS), terminal device (terminal device), etc. For convenience of description, in the embodiments of this application, the above-mentioned devices are collectively referred to as terminal devices.

In addition, in the embodiments of this application, the nouns "network" and "system" are often used interchangeably, but those skilled in the art can understand their meanings.

Before introducing the technical solutions of this application, some background technical knowledge involved in this application will be introduced and explained. The following related technologies can be arbitrarily combined with the technical solutions of the embodiments of the present application as optional solutions, and they all fall within the protection scope of the embodiments of the present application. The embodiments of this application include at least part of the following content.

1.NTN

3GPP (3rd Generation Partnership Project) has introduced NTN technology in the 5G NR (New Radio) system.

NTN systems generally use satellite communications to provide communication services to ground users. Compared with terrestrial cellular network communication systems, NTN systems have many unique advantages. First of all, the NTN system is not restricted by the user's geographical area. Since one satellite can cover a large area of the ground, and the satellite can orbit the earth, every corner of the earth can theoretically be covered by the NTN system. Secondly, the NTN system has great social value. The NTN system can be covered at a low cost in remote mountainous areas and poor and backward countries or regions, allowing people in these areas to enjoy advanced voice communications and mobile Internet technologies. It is conducive to narrowing the digital gap with developed regions and promoting the development of these regions. Thirdly, the distance between network equipment and network equipment, network equipment and communication equipment in the NTN system is long, and the cost of communication does not increase significantly as the communication distance increases. Finally, the NTN system has high stability and is not easily affected by natural disasters.

2. Four-step random access process

In the NR system, the four-step random access process is also called Type-1 random access procedure (Type-1random access procedure). As shown in Figure 4, the four-step random access process includes the following steps.

Step 1: The terminal device sends a random access preamble sequence (Random access preamble, or Msg (Message) 1) to the network device.

Step 2: The terminal device detects the random access response (Random access response, RAR, or Msg2) sent by the network device.

·If the terminal device detects the RAR corresponding to Msg1 within the RAR window, the terminal device transmits Msg3 based on the RAR;

·RAR associated random access preamble sequence ID (Random Access Preamble IDentifier, RAPID);

·RAR includes the following information: random access preamble sequence ID, Timing Advance Command (TAC), TC-RNTI (Temporary Cell-Radio Network Temporary Identifier, temporary cell-wireless network temporary identifier), uplink authorization (UL grant, also known as RAR UL grant);

·Among them, the RAR UL grant includes the following information: Frequency hopping flag, PUSCH (Physical Uplink Shared Channel, Physical Uplink Shared Channel) frequency domain resource allocation (PUSCH frequency resource allocation), PUSCH time domain resource allocation (PUSCH time resource allocation), modulation and coding scheme (Modulation and Coding Scheme, MCS), PUSCH TPC (Transmit Power Control, transmission power control) command (TPC command for PUSCH), CSI (Channel State Information, channel state information) request (CSI request);

·Among them, if it is a shared spectrum, the RAR UL grant also includes the following information: Channel access parameter indication (ChannelAccess-CPext);

·If the terminal device does not detect the RAR corresponding to Msg1 within the RAR window, the terminal device re-initiates the random access process (for example, the terminal device retransmits Msg1).

Step 3: The terminal device sends PUSCH (or Msg3 PUSCH) to the network device based on the received RAR.

·The RV (Redundancy Version) version number used by Msg3 PUSCH transmitted according to the uplink authorization in RAR is 0;

·This step allows HARQ (Hybrid Automatic Repeat reQuest, Hybrid Automatic Repeat Request) retransmission, that is, after sending PUSCH to the base station according to RAR, the terminal device may receive TC-RNTI scrambled DCIformat (Downlink Control Informationformat, downlink control information Format)0_0 to schedule the retransmission of the PUSCH;

·DCI format 0_0 of TC-RNTI scrambling code includes at least part of the following information: uplink and downlink DCI indication, frequency domain resource allocation (the size is determined according to the UL BWP (Bandwidth Part, bandwidth part) bandwidth), time domain resource allocation, Frequency domain frequency hopping indication, MCS, new data indication, RV version, HARQ process number, PUSCH power control command word, UL (Uplink, uplink)/SUL (Supplementary Uplink, supplementary uplink) carrier indication;

·Among them, if it is a shared spectrum, DCI format 0_0 also includes the following information: channel access parameter indication.

Step 4: The terminal device receives the PDSCH (Physical Downlink Shared Channel) including the contention resolution message sent by the network device, which can also be called message Msg4.

·Receive the PDSCH including the contention resolution message sent by the base station according to the DCI format 1_0 scrambled by TC-RNTI or C-RNTI (Cell-Radio Network Temporary Identifier, Cell-Radio Network Temporary Identifier);

·This step allows HARQ retransmission, that is, after receiving the TC-RNTI or C-RNTI scrambled DCI format 1_0, if the terminal device does not successfully receive the corresponding PDSCH, the terminal device will transmit the PUCCH (Physical Uplink) indicated by the DCI format 1_0 Feedback NACK (Negative Acknowledgment, Negative Acknowledgment) information on Control Channel, physical uplink control channel) resources;

·DCI format 1_0 of TC-RNTI or C-RNTI scrambling includes at least part of the following information: uplink and downlink DCI indication, frequency domain resource allocation (the size is determined based on DL BWP bandwidth), time domain resource allocation, VRB (Virtual Resource Block, virtual resource block) to PRB (Physical Resource Block, physical resource block) mapping, MCS, new data indication, RV version, HARQ process number, downlink allocation indication DAI (Downlink Assignment Index), PUCCH power control command word, PUCCH Resource indication, PDSCH-to-HARQ feedback time indication;

·Among them, if it is a shared spectrum, DCI format 1_0 also includes the following information: channel access parameter indication;

·After receiving the DCI format 1_0 of TC-RNTI or C-RNTI scrambling, if the terminal device successfully receives the corresponding PDSCH, the random access process is completed.

3. Two-step random access process

In the NR system, the two-step random access process is also called Type-2 random access procedure (Type-2 random access procedure). As shown in Figure 5, the two-step random access process includes the following steps.

Step 1: The terminal device sends the random access preamble sequence and PUSCH (or message MsgA, that is, MsgA includes PRACH and PUSCH) to the network device.

Step 2: The terminal device detects the random access response (or MsgB message) sent by the network device. Among them, MsgB includes two types of RAR, one is successRAR (successful random access response), and the other is fallbackRAR (fallback random access response).

·Case 1: If the terminal device detects the successRAR corresponding to MsgA in the RAR window, since the successRAR contains the contention resolution message, the terminal device sends ACK (Acknowledgement, positive confirmation) information to the base station, and the random access process is completed (as shown in Figure 5 shown in (a));

·successRAR includes the following information: UE Contention Resolution Identity, Transmission Power Control Command (TPC), HARQ Feedback Timing Indicator, PUCCH Resource Indicator, Timing Advance Command ( Timing advance command, TAC), C-RNTI;

· Among them, if it is a shared spectrum, successRAR also includes the following information: channel access parameter indication (ChannelAccess-CPext);

·Case 2: If the terminal device detects the fallbackRAR corresponding to the MsgA random access preamble sequence in the RAR window, the terminal device transmits Msg3 based on the fallbackRAR, or in other words, the terminal device falls back to the four-step random access process (where , the third and fourth steps are respectively the same as the third and fourth steps in the four-step random access process, as shown in (b) in Figure 5);

·fallbackRAR is associated with Random Access Preamble IDentifier (RAPID);

·FallbackRAR includes the following information: Timing advance command (TAC), TC-RNTI, uplink grant (UL grant, also called RAR UL grant);

·Among them, the RAR UL grant includes the following information: frequency domain frequency hopping flag (Frequency hopping flag), PUSCH frequency domain resource allocation (PUSCH frequency resource allocation), PUSCH time domain resource allocation (PUSCH time resource allocation), modulation and coding scheme ( MCS), TPC command for PUSCH (TPC command for PUSCH), CSI request (CSI request);

·Among them, if it is a shared spectrum, the RAR UL grant also includes the following information: Channel access parameter indication (ChannelAccess-CPext);

·If the terminal device does not detect successRAR or fallbackRAR within the RAR window, the terminal device re-initiates the two-step or four-step random access process (for example, the terminal device retransmits MsgA or Msg1).

Compared with the worst link budget of the NTN system, the performance of the existing PRACH format has a multiple dB gap and cannot meet the link budget requirements in NTN. Therefore, the existing PRACH format needs to be enhanced. Based on the above problems, the technical solution of this application proposes a wireless communication method to improve the configuration flexibility and reliability of PRACH and meet the communication needs of the NTN system.

Please refer to Figure 6, which shows a wireless communication method provided by an embodiment of the present application. This method can be applied to the system architecture shown in Figure 1 or Figure 2 or Figure 3. As shown in Figure 6, the method may include the following steps (601):

Step 601: The terminal device sends the PRACH format to the network device.

Wherein, the PRACH format includes at least one of the following: a first PRACH format including N repeated sequence SEQ groups, and a second PRACH format including M repeated PRACH sequences. The terminal device sends the PRACH format to the network device, which is sending PRACH.

In some embodiments, N and M are both positive integers. N and M may be equal or unequal. The first PRACH format and the second PRACH format are both obtained by repeating the reference PRACH format. The difference between the first PRACH format and the second PRACH format is that the repetition methods are different. Each reference PRACH format includes a CP at the beginning, a GT at the end, and SEQ between the CP and GT.

In some embodiments, the first PRACH format is repeating SEQ groups only. Optionally, as shown in repetition format 1 of Figure 7, the first PRACH format also includes: a CP and a GT, and N is the number of repetitions of the SEQ group. Optionally, each SEQ group includes one or more SEQs. That is, in this case, the first PRACH format only includes one CP and one GT. By repeating the SEQ group between the CP and GT, the time domain range of the SEQ group in the time domain occupied by the first PRACH format is expanded. , thereby enhancing the coverage corresponding to the PRACH format to meet the wireless communication needs of the NTN system.

In some embodiments, the second PRACH format is obtained by repeating the entire PRACH sequence (ie, the entire reference PRACH format). Optionally, as shown in repetition format 2 of Figure 7, each PRACH sequence includes: a CP, at least one SEQ and a GT, and M is the number of repetitions of the PRACH sequence. In this way, the entire PRACH sequence is repeated M times, and each repetition contains a CP and a GT. No matter which reference PRACH format is repeated, the PRACH format obtained by repeating M times includes M CPs and M GTs. That is, the second PRACH format is obtained by repeating a single PRACH sequence, and each PRACH sequence includes the same number of SEQs; obviously, the more PRACH sequences the second PRACH format includes, the more SEQs occupy in the second PRACH format. The total duration is longer, thereby enhancing the coverage corresponding to the PRACH format to meet the wireless communication needs of the NTN system.

In some embodiments, N and/or M are positive integers such as 1, 2, 3, 4, etc. In some embodiments, if the repetition of the SEQ group and/or the PRACH sequence is a double repetition, N and/or M may be 1, 2, 4, 8, etc. The embodiments of the present application do not specifically limit this.

In some embodiments, the duration of CP and GT is variable.

To sum up, the technical solution provided by the embodiments of the present application sets the PRACH format to include N repeated SEQ groups and/or M repeated PRACH sequences, so that the PRACH format can be configured according to actual needs and the configuration of PRACH can be improved. Flexibility and reliability improve PRACH access performance.

Optionally, the number of repetitions N of the SEQ group and/or the number of repetitions M of the PRACH sequence are determined by the network device and notified to the terminal device.

In some embodiments, the network device determines the number of repetitions N of the SEQ group and/or the number of repetitions M of the PRACH sequence, and sends the number of repetitions N of the SEQ group and/or the number of repetitions M of the PRACH sequence to the terminal device. The terminal device may configure the PRACH format according to the number of repetitions N of the received SEQ group and/or the number of repetitions M of the PRACH sequence. Thereby saving computing and processing resources of the terminal device,

Optionally, the number of repetitions N of the SEQ group and/or the number of repetitions M of the PRACH sequence is determined according to the scenario in which the terminal device is located.

In some embodiments, the number of repetitions N of the SEQ group and the number M of repetitions of the PRACH sequence can be determined by the scenario in which the terminal device is located. For example, for wireless communication scenarios with small coverage areas, the number of repetitions N of the SEQ group and/or the number of repetitions M of the PRACH sequence can be set relatively low, so as to meet the communication requirements (that is, cover the required coverage communication area). , saving signaling overhead and time domain resources. For another example, for wireless communication scenarios with large coverage areas, the number of repetitions N of the SEQ group and/or the number of repetitions M of the PRACH sequence can be set relatively high to ensure that it takes a longer time in the time domain and meets the needs of large coverage. , so as to meet communication needs as much as possible. It can be seen that the number of repetitions N of the SEQ group and/or the number of repetitions M of the PRACH sequence can be flexibly configured according to the scenario where the terminal device is located, thereby improving the flexibility of PRACH settings.

Optionally, the number of repetitions N of the SEQ group and/or the number of repetitions M of the PRACH sequence is determined according to the link budget corresponding to the scenario in which the terminal device is located.

In some embodiments, the greater the gap between the PRACH format and the required link budget, the higher the number of repetitions N of the SEQ group and/or the number of repetitions M of the PRACH sequence. That is, the performance of the PRACH format can be enhanced to meet the communication requirements of the NTN system by increasing the number of repetitions N of the SEQ group and/or increasing the number of repetitions M of the PRACH sequence.

Optionally, determine the number of repetitions N of the SEQ group based on the first CNR (Carrier to Noise Ratio) difference, which refers to the difference between the reference PRACH format corresponding to the first PRACH format and the first link budget. CNR gap; and/or, determine the number of repetitions M of the PRACH sequence according to the second CNR gap, where the second CNR gap refers to the CNR gap between the reference PRACH format corresponding to the second PRACH format and the second link budget.

The first link budget and the second link budget are determined according to the link budget corresponding to the scenario in which the terminal device is located.

In some embodiments, the first link budget is a link budget corresponding to the first PRACH format, and the second link budget is a link budget corresponding to the second PRACH format. The link budget corresponding to the scenario in which the terminal device is located may be the sum of the first link budget and the second link budget.

Of course, when the PRACH format only includes the first PRACH format but not the second PRACH format, the second link budget can be considered to be zero; when the PRACH format only includes the second PRACH format but not the first PRACH format , the first link budget can be considered to be zero. That is, the first link budget is the link budget corresponding to the scenario where the terminal device is located,

Or the second link budget is the link budget corresponding to the scenario where the terminal device is located,

Or the sum of the first link budget and the second link budget is the link budget corresponding to the scenario where the terminal device is located.

In some embodiments, the number of repetitions N of the SEQ group is positively correlated with the first CNR gap, and the number of repetitions M of the PRACH sequence is positively correlated with the second CNR gap.

Optionally, the SEQ group or PRACH sequence is determined based on a reference PRACH format, which includes at least one of the following: PRACH format 0, PRACH format 1, PRACH format 2, and PRACH format 3.

Optionally, the SEQ group of PRACH format 0 includes 1 SEQ with a time domain occupancy duration of 24576Ts; the SEQ group of PRACH format 1 includes 2 SEQs with a time domain occupancy duration of 24576Ts; and the SEQ group of PRACH format 2 includes 4 time domain occupancies. A SEQ with a domain occupancy duration of 24576Ts; the SEQ group of PRACH format 3 includes 4 SEQs with a time domain occupancy duration of 6144Ts.

As shown in Figure 8, the reference PRACH format may include PRACH format 0 (PRACH format 0), PRACH format 1 (PRACH format 1), PRACH format 2 (PRACH format 2) and PRACH format 3 (PRACH format 3). Among them, PRACH format 0 is mainly used in LTE spectrum reuse scenarios, PRACH format 1 is mainly used in long-distance coverage scenarios, PRACH format 2 is mainly used in coverage enhancement scenarios, and PRACH format 3 is mainly used in high-speed mobile scenarios. The time occupied by each of the above formats is shown in Table 1 below.

Table 1: Duration occupied by PRACH format with length 839

Format	Sequence length	subcarrier spacing	SEQ duration	CP duration	GT duration
0	839	1.25kHz	24576Ts	3168Ts		2976Ts
1	839	1.25kHz	2*24576Ts	21024Ts		21984Ts
2	839	1.25kHz	4*24576Ts	4688Ts		4528Ts
3	839	5kHz	4*6144Ts	3168Ts	2976Ts

Among them, the CP of PRACH format 0 has the same length as the CP of PRACH format 3. They are both the shortest and occupy 3168Ts (Time Slot, sampling period, which can also be called sampling interval or time slot). The difference lies in the subcarrier spacing of the two formats. Different, the number of repetitions of the intermediate sequence is different, but the entire sequence format takes the same time.

Among them, the application scenario of PRACH format 2 in the existing standard is coverage enhancement, in which CP accounts for 4688Ts, SEQ accounts for 4*24576Ts, and GT accounts for 4528Ts, T _s = 1/(Δf _ref ·N _f,ref ), Δf _ref = 15·10 ³ Hz, N _f,ref =2048, the total time occupied by the entire PRACH format 2 is 3.5ms, which is the longest among the 839 sequence lengths. Among them, SEQ can also be called Preamble sequence.

Among them, the subcarrier spacing of PRACH format 3 is 5kHz, the total occupation length is 1ms, and the middle SEQ is repeated 4 times.

The related coverage enhancement technology uses PRACH format 2 (that is, the sequence length is 839, the subcarrier spacing is 1.25kHz, the sequence is repeated 4 times, and the CP duration + SEQ duration + GT duration = 3.5ms), in NTN In the system, due to the large satellite coverage, as shown in Table 2, analysis and simulation based on the existing PRACH format 2 sequence used for coverage enhancement found that although the SEQ has been repeated 4 times, it is consistent with the worst link budget. In comparison, there is still a gap of multiple dB, which cannot meet the link budget requirements in NTN. Therefore, the existing PRACH format needs to be enhanced. Among them, SC1 and SC7 scenarios can refer to Table 2 below.

Table 2: PRACH format 2 simulation and link budget results

Considering that the basic formats of PRACH formats 0, 1, 2, and 3 are similar, the difference lies in different CP durations, different sequence repetition times, and different subcarrier intervals, so the enhancement scheme for PRACH formats can be based on one of them. format or several formats to meet the needs of the NTN system and ensure the normal operation of the system.

In some embodiments, the multiple for doubling the PRACH sequence is determined based on the gap between the current PRACH and the link budget, and then the number of repetitions is determined.

In some embodiments, taking PRACH format 0 as an example, only the SEQ in PRACH format 0 is repeated, and the CP and GT are not repeated, that is, there is one CP and one GT at the beginning and end. Considering that the SEQ duration in the middle of PRACH format 0 and format 2 is the same, it is assumed that the maximum performance gap is 6.5dB. According to the theoretical calculation of doubling the SEQ repeatedly and increasing the gain by 3dB, as shown in Figure 9, the number of SEQ groups in PRACH format 0 needs to be quadrupled (it can also be called quadrupled, that is, the SEQ group needs to be repeated 16 times). To meet the link budget requirements (the performance gain reaches 9dB at this time), the total duration is 13ms. The PRACH format obtained by this repetition method can be called PRACH format 5. Since PRACH format 5 only repeats the SEQ group, there is only a CP at the beginning and a GT at the end. There are no intermediate CPs and GTs occupying the resources of the PRACH sequence, so the total The duration is relatively shorter, the total resources occupied are relatively less, and it can support a delay greater than one PRACH OFDM symbol, because each PRACH OFDM symbol can be used as the CP of the next PRACH OFDM symbol, so the cell coverage performance is better. This new sequence can meet the link budget requirements.

In some embodiments, as shown in Figure 10, if the second link budget is the link budget corresponding to the scenario where the terminal device is located, taking PRACH format 2 as an example, assuming that the performance of the existing PRACH format 2 is the same as the worst Compared with the link budget, there is a 6.5dB performance gap. According to the theoretical calculation of doubling the PRACH sequence repetition, the gain increases by 3dB (that is, every time the number of repetitions of the PRACH sequence doubles, the performance gain of the PRACH sequence increases by 3dB). PRACH format 2 needs to be doubled at least 2 times (that is, quadrupled), that is, the entire PRACH format 2 needs to be repeated 4 times to meet the system requirements (at this time, PRACH format 2 actually improves the performance gain by 6dB, which is still less than 6.5dB, but The difference is only 0.5dB. Considering that doubling it again will occupy more time domain resources, it can be considered that repeating it 4 times meets the system requirements).

Optionally, the scenario is related to at least one of the following parameters: the orbital altitude of the satellite, the center frequency point where the terminal device is located, the elevation angle between the satellite and the terminal device, and the channel bandwidth. The scene may also be related to other parameters, which are not specifically limited in the embodiments of this application.

Optionally, the PRACH format occupies an integer multiple of milliseconds (ms, millisecond) in the time domain, or an integer multiple of half a millisecond.

In some embodiments, the PRACH format occupies an integer multiple of half a millisecond in the time domain, such as 4 milliseconds, 6.5 milliseconds, 8 milliseconds, 13 milliseconds, and so on.

Optionally, by adjusting the duration of the CP and/or GT in the PRACH, the time domain occupation duration of the PRACH is an integral multiple of milliseconds, or an integral multiple of half a millisecond. This ensures that the resource where PRACH is located can be aligned with other resources based on 1ms or 0.5ms boundaries. In some embodiments, priority is given to adjusting the GT duration; when adjusting the GT duration alone cannot make the PRACH time domain occupation last an integer multiple of milliseconds or an integer multiple of half a millisecond, the CP duration may be considered.

Optionally, adjusting the duration of CP and/or GT includes at least one of the following: shortening the duration of GT, increasing the duration of GT, shortening the duration of CP, and increasing the duration of CP.

For the first PRACH format, after the SEQ group is repeated N times, the time domain occupation duration of PRACH may not belong to an integer multiple of milliseconds or an integer multiple of half a millisecond. Then the duration of CP and/or GT can be appropriately adjusted so that PRACH The time domain occupies an integer multiple of milliseconds or an integer multiple of half a millisecond. The number of repetitions of the SEQ group and the duration of the time domain of each SEQ group remain unchanged. For example, if after the SEQ group is repeated N times, the time domain occupation time of PRACH is 8.8 milliseconds, you can increase the duration of GT by 0.2 milliseconds, or increase the duration of CP by 0.2 milliseconds, or increase the duration of CP and GT by 0.1 each. milliseconds, or shorten the duration of GT by 0.3 milliseconds, or shorten the duration of CP by 0.3 milliseconds, or shorten the lengths of CP and GT by 0.15 milliseconds each, so that the time domain occupation duration of PRACH is adjusted to 9 milliseconds or 8.5 milliseconds, that is, PRACH The time domain occupancy duration is adjusted to an integer multiple of milliseconds or an integer multiple of half a millisecond.

For the second PRACH format, the duration of a single PRACH sequence (such as PRACH format 0, PRACH format 1, PRACH format 2, PRACH format 3) itself belongs to an integer multiple of milliseconds or an integer multiple of half a millisecond, and M is a positive integer, then The time domain occupation duration of the second PRACH format obtained after the PRACH sequence is repeated M times is still an integer multiple of milliseconds, or an integer multiple of half a millisecond.

In some embodiments, the repetitive format 2 in Figure 7 can be used as shown in Case 1 in Figure 11 by adjusting the duration of CP and/or GT so that the time domain of the second PRACH format occupies an integer multiple of milliseconds. ; Alternatively, the above-mentioned repetition format 2 in Figure 7 can be as shown in case 2 in Figure 11, by adjusting the duration of CP and/or GT so that the time domain occupation duration of PRACH is an integer multiple of half a millisecond. Among them, Pms means that the duration of a single CP is P milliseconds; Tms means that the duration of a single GT is T milliseconds.

In some embodiments, taking PRACH format 0 as an example, only the SEQ in PRACH format 0 is repeated, and the CP and GT are not repeated, that is, if the first link budget is the link budget corresponding to the scenario where the terminal device is located; If the SEQ in PRACH format 0 is only repeated 8 times, then the duration of the entire new PRACH format 6 is 6.6ms, which does not satisfy the requirement that the entire format duration is an integer multiple of milliseconds or an integer multiple of half a millisecond, so the CP needs to be redesigned. Or the duration of GT. Considering that the general duration of GT is used to ensure that the resource where PRACH is located and other resources are aligned at the boundary of an integer multiple of milliseconds or an integer multiple of half a millisecond, the duration of GT in PRACH format 0 can be appropriately reduced to minimize Close to the duration of PRACH format 6, 6.6ms. As shown in Figure 12, the duration of the entire PRACH format 6 can be considered to be designed to 6.5ms, so that the new PRACH time domain occupies an integer multiple of half a millisecond, meets the link budget requirements, and ensures the normal operation of the system. .

As shown in Figure 10, during the process of repeating PRACH format 2, the original PRACH format 2 remains unchanged, but the entire PRACH format 2 is repeated. Each repetition process also includes repeating CP and GT. This repetition method does not introduce a new PRACH format sequence, is simple to implement, and the number of repetitions can be flexibly configured according to the gap with the link budget, and there is no need to redesign the CP length and GT length (because the time domain occupation length of PRACH format 2 is an integer times half a millisecond), it can meet the requirement that the total PRACH format duration is an integer multiple of milliseconds or an integer multiple of half a millisecond under different times of repetition, and can also meet the link budget requirements. If the difference between the performance of PRACH format 2 and the worst link budget is less than 6.5dB (such as 2dB, 3dB, etc.), then the number of repetitions can be reduced.

The format obtained after PRACH format 2 is repeated 4 times can be defined as PRACH format 4. The total duration of PRACH format 4 is 14ms. It can be seen that the PRACH performance can be improved by repeating the PRACH format (such as PRACH format 2) multiple times to ensure the normal operation of the system.

In some embodiments, the Carrier-to-Noise-and-Interference Ratio (CNIR) of the transmission link between the satellite and the terminal equipment in the NTN system can be based on CNR and CIR (Carrier-to-Interference Ratio). , carrier-to-interference ratio) is derived. For details, please refer to the following formula 1:

Formula 1:

CNIR[dB]＝-10log ₁₀ (10 ^-0.1CNR[dB] +10 ^-0.1CIR[dB] )

In some embodiments, CNR calculation may refer to the following formula 2:

Formula 2:

Among them, EIRP (effective isotropic radiated power) is the effective isotropic radiated power;

is the ratio of antenna gain to noise temperature; k is Boltzmann’s constant, k can be -228.6dBW/k/Hz; PL _FS (free space path loss) refers to free space path loss; PL _A (Atmospheric Path Loss) is the atmospheric path loss caused by gas and rain; PL _SM (shadowing margin) refers to the shadow margin; PL _SL (scintillation loss) is the scintillation loss; PL _AD (additional loss) is the additional loss, for example, in a non-regenerative system In this case, the degradation due to the feeder link; B is the channel bandwidth.

In some embodiments,

The calculation refers to the following formula 3:

Formula 3:

Among them, G _R is the receiving antenna gain; N _f is the noise coefficient; T ₀ is the ambient temperature; _Ta is the antenna temperature.

In some embodiments, the calculation of _GR can refer to the following formula 4:

Formula 4:

Among them, G _R,e is the receiving antenna unit gain, NR _,a is the number of receiving antenna elements, L _p is the polarization loss, eta is the antenna aperture efficiency (a dimensionless parameter with typical values of 0.55 to 0.70 for parabolic antennas), D is the equivalent antenna diameter, and λ is the wavelength.

In some embodiments, EIRP can be calculated by the following Equation 5:

Formula 5:

EIRP[dBW]＝P _T [dBW]-L _C [dB]+G _T [dBi]

Among them, P _T is the antenna transmit power, L _C is the cable loss, and G _T is the transmit antenna gain.

In some embodiments, G _T can be derived by the following Equation 6:

Formula 6:

Among them, G _T,e is the transmitting antenna unit gain, and NT _,a is the number of transmitting antenna units.

Optionally, the subframe index corresponding to the time domain starting position of the PRACH is determined based on the configuration period of the PRACH and the time domain occupation duration of the PRACH.

Optionally, when the configuration period of PRACH corresponds to k system frames, the time domain starting position of PRACH is located within the first system frame of k system frames, and the time domain end position of PRACH is located within k system frames. Within the k-th system frame in the system frame, k is a positive integer.

In some embodiments, a system frame (frame for short) is 10 milliseconds, and each system frame includes 10 subframes. The indexes of the 10 subframes in each system frame are #0~#9, and each subframe is 1 millisecond. The time domain starting position of PRACH in each system frame is determined based on the PRACH configuration period and the PRACH time domain occupation duration to ensure that PRACH is transmitted within one configuration period. For example, if the configuration period of the PRACH is 10 milliseconds and the time domain occupation duration is less than or equal to 10 milliseconds, the PRACH can be transmitted within one configuration period by determining the time domain starting position of the PRACH. If the configuration period of PRACH is 20 milliseconds and the time domain occupancy duration is greater than 10 milliseconds and less than 20 milliseconds, you can determine the starting position of the PRACH time domain so that the PRACH time domain only occupies 2 system frames, that is, it is guaranteed to be in one configuration. Send the completed PRACH within the cycle and do not exceed the configuration cycle.

In some embodiments, if the configuration period of PRACH is 20 milliseconds and the time domain occupation duration is 14 milliseconds, which exceeds one system frame, some configurations of PRACH can be as shown in Table 3 below.

Table 3: PRACH resource configuration

As shown in Table 3 above, if the time domain occupation time of PRACH is 14 milliseconds, the subframe index corresponding to the time domain starting position of PRACH can be 0 to 6, so that the time domain ending position of PRACH is within the configuration period. Ensure that PRACH meets the requirements of the configuration cycle.

It should be noted that the above steps related to the execution of the terminal device can be independently implemented as a wireless communication method on the terminal device side; the above steps related to the network device execution can be independently implemented as a wireless communication method on the network device side.

The following are device embodiments of the present application, which can be used to execute method embodiments of the present application. For details not disclosed in the device embodiments of this application, please refer to the method embodiments of this application.

Please refer to Figure 13, which shows a block diagram of a wireless communication device provided by an embodiment of the present application. The device has the function of implementing the above-mentioned wireless communication method on the terminal device side. The function can be implemented by hardware, or can be implemented by hardware executing corresponding software. The device can be the terminal equipment introduced above, or can be set in the terminal equipment. As shown in Figure 13, the device 1300 may include: a sending module 1310.

The sending module 1310 is used to send the PRACH format; wherein,

The PRACH format includes at least one of the following:

The first PRACH format including N repeated sequence SEQ groups,

A second PRACH format including M repeated PRACH sequences.

In some embodiments, the first PRACH format further includes: a cyclic prefix CP and a guard time GT.

In some embodiments, each PRACH sequence includes: a CP, at least one SEQ and a GT.

In some embodiments, the number of repetitions N of the SEQ group and/or the number of repetitions M of the PRACH sequence is determined by the network device and notified to the terminal device.

In some embodiments, the number of repetitions N of the SEQ group and/or the number of repetitions M of the PRACH sequence is determined according to the scenario in which the terminal device is located.

In some embodiments, the number of repetitions N of the SEQ group and/or the number of repetitions M of the PRACH sequence is determined according to the link budget corresponding to the scenario in which the terminal device is located.

In some embodiments, the number of repetitions N of the SEQ group and/or the number of repetitions M of the PRACH sequence is determined as follows:

Determine the number of repetitions N of the SEQ group according to the first carrier-to-noise ratio CNR gap, where the first CNR gap refers to the CNR gap between the reference PRACH format corresponding to the first PRACH format and the first link budget;

and / or,

Determine the number of repetitions M of the PRACH sequence according to a second CNR gap, where the second CNR gap refers to the CNR gap between the reference PRACH format corresponding to the second PRACH format and the second link budget;

Wherein, the first link budget and the second link budget are determined according to the link budget corresponding to the scene in which the terminal device is located.

In some embodiments, the scenario is related to at least one of the following parameters: the orbital altitude of the satellite, the center frequency point where the terminal device is located, the elevation angle between the satellite and the terminal device, and the channel bandwidth.

In some embodiments, the SEQ group or the PRACH sequence is determined based on a reference PRACH format, which includes at least one of the following: PRACH format 0, PRACH format 1, PRACH format 2, and PRACH format 3.

In some embodiments, the SEQ group of PRACH format 0 includes 1 SEQ with a time domain occupation duration of 24576Ts;

The SEQ group of PRACH format 1 includes 2 SEQs with a time domain occupation duration of 24576Ts;

The SEQ group of PRACH format 2 includes 4 SEQs with a time domain occupation duration of 24576Ts;

The SEQ group of PRACH format 3 includes 4 SEQs with a time domain occupation duration of 6144Ts.

In some embodiments, the time domain occupation duration of the PRACH format is an integer multiple of milliseconds, or an integer multiple of half a millisecond.

In some embodiments, by adjusting the duration of CP and/or GT in the PRACH format, the time domain occupation duration of the PRACH format is an integer multiple of milliseconds, or an integer multiple of half a millisecond.

In some embodiments, the subframe index corresponding to the time domain starting position of the PRACH format is determined based on the configuration period of the PRACH format and the time domain occupation duration of the PRACH format.

In some embodiments, when the configuration period of the PRACH format corresponds to k system frames, the time domain starting position of the PRACH format is located within the first system frame among the k system frames, And the time domain end position of the PRACH format is located within the k-th system frame among the k system frames, and k is a positive integer.

To sum up, the technical solution provided by the embodiments of the present application sets the PRACH format to include N repeated SEQ groups and/or M repeated PRACH sequences, so that the PRACH format can be configured according to actual needs and the configuration of PRACH can be improved. Flexibility and reliability improve PRACH access performance.

Please refer to FIG. 14 , which shows a block diagram of a wireless communication device provided by another embodiment of the present application. The device has the function of implementing the above-mentioned wireless communication method on the network device side. The function can be implemented by hardware, or can be implemented by hardware executing corresponding software. The device can be the network device introduced above, or can be set in the network device. As shown in Figure 14, the device 1400 may include: a receiving module 1410.

The receiving module 1410 is used to receive the PRACH format sent by the terminal device; wherein,

The PRACH format includes at least one of the following:

The first PRACH format including N repeated sequence SEQ groups,

A second PRACH format including M repeated PRACH sequences.

In some embodiments, the first PRACH format further includes: a cyclic prefix CP and a guard time GT.

In some embodiments, each PRACH sequence includes: a CP, at least one SEQ and a GT.

In some embodiments, the number of repetitions N of the SEQ group and/or the number of repetitions M of the PRACH sequence is determined by the network device and notified to the terminal device.

In some embodiments, the number of repetitions N of the SEQ group and/or the number of repetitions M of the PRACH sequence is determined according to the scenario in which the terminal device is located.

In some embodiments, the number of repetitions N of the SEQ group and/or the number of repetitions M of the PRACH sequence is determined according to the link budget corresponding to the scenario in which the terminal device is located.

In some embodiments, the number of repetitions N of the SEQ group and/or the number of repetitions M of the PRACH sequence is determined as follows:

Determine the number of repetitions N of the SEQ group according to the first carrier-to-noise ratio CNR gap, where the first CNR gap refers to the CNR gap between the reference PRACH format corresponding to the first PRACH format and the first link budget;

and / or,

Determine the number of repetitions M of the PRACH sequence according to a second CNR gap, where the second CNR gap refers to the CNR gap between the reference PRACH format corresponding to the second PRACH format and the second link budget;

Wherein, the first link budget and the second link budget are determined according to the link budget corresponding to the scene in which the terminal device is located.

In some embodiments, the scenario is related to at least one of the following parameters: the orbital altitude of the satellite, the center frequency point where the terminal device is located, the elevation angle between the satellite and the terminal device, and the channel bandwidth.

In some embodiments, the SEQ group or the PRACH sequence is determined based on a reference PRACH format, which includes at least one of the following: PRACH format 0, PRACH format 1, PRACH format 2, and PRACH format 3.

In some embodiments, the SEQ group of PRACH format 0 includes 1 SEQ with a time domain occupation duration of 24576Ts;

The SEQ group of PRACH format 1 includes 2 SEQs with a time domain occupation duration of 24576Ts;

The SEQ group of PRACH format 2 includes 4 SEQs with a time domain occupation duration of 24576Ts;

The SEQ group of PRACH format 3 includes 4 SEQs with a time domain occupation duration of 6144Ts.

In some embodiments, the time domain occupation duration of the PRACH format is an integer multiple of milliseconds, or an integer multiple of half a millisecond.

In some embodiments, by adjusting the duration of CP and/or GT in the PRACH format, the time domain occupation duration of the PRACH format is an integer multiple of milliseconds, or an integer multiple of half a millisecond.

In some embodiments, the subframe index corresponding to the time domain starting position of the PRACH format is determined based on the configuration period of the PRACH format and the time domain occupation duration of the PRACH format.

In some embodiments, when the configuration period of the PRACH format corresponds to k system frames, the time domain starting position of the PRACH format is located within the first system frame among the k system frames, And the time domain end position of the PRACH format is located within the k-th system frame among the k system frames, and k is a positive integer.

To sum up, the technical solution provided by the embodiments of the present application sets the PRACH format to include N repeated SEQ groups and/or M repeated PRACH sequences, so that the PRACH format can be configured according to actual needs and the configuration of PRACH can be improved. Flexibility and reliability improve PRACH access performance.

Regarding the devices in the above embodiments, the specific manner in which each module performs operations has been described in detail in the embodiments related to the method, and will not be described in detail here. It should be noted that when implementing the functions of the device provided by the above embodiments, only the division of the above functional modules is used as an example. In practical applications, the above functions can be allocated to different functional modules according to needs, that is, The internal structure of the device is divided into different functional modules to complete all or part of the functions described above. In addition, the apparatus and method embodiments provided in the above embodiments belong to the same concept, and the specific implementation process can be found in the method embodiments, which will not be described again here.

Please refer to Figure 15, which shows a schematic structural diagram of a terminal device 1500 provided by an embodiment of the present application. The terminal device 1500 can be used to perform the method steps related to the terminal device execution in the above embodiments. The terminal device 1500 may include: a processor 1501, a transceiver 1502, and a memory 1503.

The processor 1501 includes one or more processing cores. The processor 1501 executes various functional applications and information processing by running software programs and modules.

The transceiver 1502 may include a receiver and a transmitter. For example, the receiver and the transmitter may be implemented as the same wireless communication component, and the wireless communication component may include a wireless communication chip and a radio frequency antenna.

Memory 1503 may be connected to processor 1501 and transceiver 1502.

The memory 1503 can be used to store a computer program executed by the processor, and the processor 1501 is used to execute the computer program to implement various steps executed by the terminal device in the above method embodiment.

Additionally, memory 1503 may be implemented by any type of volatile or non-volatile storage device, or combination thereof, including but not limited to: magnetic or optical disks, electrically erasable programmable Read-only memory, erasable programmable read-only memory, static ready-access memory, read-only memory, magnetic memory, flash memory, programmable read-only memory.

In an exemplary embodiment, the transceiver 1502 is configured to send a PRACH format; wherein the PRACH format includes at least one of the following: a first PRACH format including N repeated sequence SEQ groups, including M repeated The second PRACH format of the PRACH sequence.

For details that are not described in detail in the above embodiments, please refer to the introduction in the above method embodiments and will not be described again here.

Please refer to Figure 16, which shows a schematic structural diagram of a network device 1600 provided by an embodiment of the present application. The network device 1600 may be used to perform the method steps related to network device execution in the above embodiments. The network device 1600 may include: a processor 1601, a transceiver 1602, and a memory 1603.

The processor 1601 includes one or more processing cores. The processor 1601 executes various functional applications and information processing by running software programs and modules.

Transceiver 1602 may include a receiver and a transmitter. For example, the transceiver 1602 may include a wired communication component, and the wired communication component may include a wired communication chip and a wired interface (such as an optical fiber interface). Optionally, the transceiver 1602 may also include a wireless communication component, which may include a wireless communication chip and a radio frequency antenna.

Memory 1603 may be connected to processor 1601 and transceiver 1602.

The memory 1603 may be used to store a computer program executed by the processor, and the processor 1601 is used to execute the computer program to implement various steps performed by the network device in the above method embodiment.

Additionally, memory 1603 may be implemented by any type of volatile or non-volatile storage device, or combination thereof, including but not limited to: magnetic or optical disks, electrically erasable programmable Read-only memory, erasable programmable read-only memory, static ready-access memory, read-only memory, magnetic memory, flash memory, programmable read-only memory.

In an exemplary embodiment, the transceiver 1602 is configured to receive a PRACH format sent by a terminal device; wherein the PRACH format includes at least one of the following: a first PRACH format including N repeated sequence SEQ groups, A second PRACH format including M repeated PRACH sequences.

For details that are not described in detail in the above embodiments, please refer to the introduction in the above method embodiments and will not be described again here.

Embodiments of the present application also provide a computer-readable storage medium. A computer program is stored in the storage medium. The computer program is used to be executed by a processor of a terminal device or a network device to implement the wireless communication on the terminal device side. Communication method, or implementing the above wireless communication method on the network device side.

Optionally, the computer-readable storage medium may include: ROM (Read-Only Memory), RAM (Random-Access Memory), SSD (Solid State Drives, solid state drive) or optical disk, etc. Among them, random access memory can include ReRAM (Resistance Random Access Memory, resistive random access memory) and DRAM (Dynamic Random Access Memory, dynamic random access memory).

Embodiments of the present application also provide a chip, which includes programmable logic circuits and/or program instructions. When the chip is run on a terminal device or a network device, it is used to implement the wireless communication method on the terminal device side. , or implement the above wireless communication method on the network device side.

Embodiments of the present application also provide a computer program product. The computer program product includes computer instructions. The computer instructions are stored in a computer-readable storage medium. The processor of the terminal device or network device obtains the instructions from the computer-readable storage medium. The medium reads and executes the computer instructions to implement the wireless communication method on the terminal device side, or to implement the wireless communication method on the network device side.

It should be understood that the "instruction" mentioned in the embodiments of this application may be a direct instruction, an indirect instruction, or an association relationship. For example, A indicates B, which can mean that A directly indicates B, for example, B can be obtained through A; it can also mean that A indirectly indicates B, for example, A indicates C, and B can be obtained through C; it can also mean that there is an association between A and B. relation.

In the description of the embodiments of this application, the term "correspondence" can mean that there is a direct correspondence or indirect correspondence between the two, it can also mean that there is an associated relationship between the two, or it can mean indicating and being instructed, configuration and being. Configuration and other relationships.

The "plurality" mentioned in this article means two or more than two. "And/or" describes the relationship between related objects, indicating that there can be three relationships. For example, A and/or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the related objects are in an "or" relationship.

"Greater than or equal to" mentioned herein may mean greater than equal to or greater than, and "less than or equal to" may mean less than equal to or less than.

In addition, the step numbers described in this article only illustrate a possible execution sequence between the steps. In some other embodiments, the above steps may not be executed in the numbering sequence, such as two different numbers. The steps are executed simultaneously, or two steps with different numbers are executed in the reverse order as shown in the figure, which is not limited in the embodiments of the present application.

Those skilled in the art should realize that in one or more of the above examples, the functions described in the embodiments of the present application can be implemented using hardware, software, firmware, or any combination thereof. When implemented using software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. Storage media can be any available media that can be accessed by a general purpose or special purpose computer.

The above are only exemplary embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection of the present application. within the range.

Claims (35)

1. A wireless communication method, characterized in that the method includes:

   The terminal equipment sends the physical random access channel PRACH format; where,

   The PRACH format includes at least one of the following:

   The first PRACH format including N repeated sequence SEQ groups,

   A second PRACH format including M repeated PRACH sequences.
2. The method according to claim 1, wherein the first PRACH format further includes: a cyclic prefix CP and a guard time GT.
3. The method according to claim 1 or 2, characterized in that each PRACH sequence includes: a CP, at least one SEQ and a GT.
4. The method according to any one of claims 1 to 3, characterized in that the number of repetitions N of the SEQ group and/or the number of repetitions M of the PRACH sequence are determined by a network device and notified to the terminal device.
5. The method according to any one of claims 1 to 4, characterized in that the number of repetitions N of the SEQ group and/or the number of repetitions M of the PRACH sequence are determined according to the scenario in which the terminal device is located.
6. The method according to claim 5, characterized in that the number of repetitions N of the SEQ group and/or the number of repetitions M of the PRACH sequence are determined according to the link budget corresponding to the scenario in which the terminal device is located.
7. The method according to claim 6, characterized in that the number of repetitions N of the SEQ group and/or the number of repetitions M of the PRACH sequence is determined as follows:

   Determine the number of repetitions N of the SEQ group according to the first carrier-to-noise ratio CNR gap, where the first CNR gap refers to the CNR gap between the reference PRACH format corresponding to the first PRACH format and the first link budget;

   and / or,

   Determine the number of repetitions M of the PRACH sequence according to a second CNR gap, where the second CNR gap refers to the CNR gap between the reference PRACH format corresponding to the second PRACH format and the second link budget;

   Wherein, the first link budget and the second link budget are determined according to the link budget corresponding to the scene in which the terminal device is located.
8. The method according to any one of claims 5 to 7, characterized in that the scene is related to at least one of the following parameters: the orbital height of the satellite, the center frequency point where the terminal equipment is located, the satellite and the terminal Elevation angle between devices, channel bandwidth.
9. The method according to any one of claims 1 to 8, characterized in that the SEQ group or the PRACH sequence is determined based on a reference PRACH format, and the reference PRACH format includes at least one of the following: PRACH format 0, PRACH format 1. PRACH format 2, PRACH format 3.
10. The method according to claim 9, characterized in that:

    The SEQ group of PRACH format 0 includes 1 SEQ with a time domain occupation duration of 24576Ts;

    The SEQ group of PRACH format 1 includes 2 SEQs with a time domain occupation duration of 24576Ts;

    The SEQ group of PRACH format 2 includes 4 SEQs with a time domain occupation duration of 24576Ts;

    The SEQ group of PRACH format 3 includes 4 SEQs with a time domain occupation duration of 6144Ts.
11. The method according to any one of claims 1 to 10, characterized in that the time domain occupation duration of the PRACH format is an integer multiple of milliseconds, or an integer multiple of half a millisecond.
12. The method according to claim 11, characterized in that by adjusting the duration of CP and/or GT in the PRACH format, the time domain occupation duration of the PRACH format is an integer multiple of milliseconds, or an integer multiple of half a millisecond. millisecond.
13. The method according to any one of claims 1 to 12, characterized in that the subframe index corresponding to the time domain starting position of the PRACH format is based on the configuration period of the PRACH format and the time domain occupation of the PRACH format. Duration determined.
14. The method according to claim 13, characterized in that when the configuration period of the PRACH format corresponds to k system frames, the time domain starting position of the PRACH format is located at the first k system frames. Within 1 system frame, and the time domain end position of the PRACH format is located within the k-th system frame among the k system frames, and k is a positive integer.
15. A wireless communication method, characterized in that the method includes:

    The network device receives the physical random access channel PRACH format sent by the terminal device; where,

    The PRACH format includes at least one of the following:

    The first PRACH format including N repeated sequence SEQ groups,

    A second PRACH format including M repeated PRACH sequences.
16. The method according to claim 15, characterized in that the first PRACH format further includes: a cyclic prefix CP and a guard time GT.
17. The method according to claim 15 or 16, characterized in that each PRACH sequence includes: a CP, at least one SEQ and a GT.
18. The method according to any one of claims 15 to 17, characterized in that the number of repetitions N of the SEQ group and/or the number of repetitions M of the PRACH sequence are determined by a network device and notified to the terminal device.
19. The method according to any one of claims 15 to 18, characterized in that the number of repetitions N of the SEQ group and/or the number of repetitions M of the PRACH sequence are determined according to the scenario in which the terminal device is located.
20. The method according to claim 19, characterized in that the number of repetitions N of the SEQ group and/or the number of repetitions M of the PRACH sequence are determined according to the link budget corresponding to the scenario in which the terminal device is located.
21. The method according to claim 20, characterized in that the number of repetitions N of the SEQ group and/or the number of repetitions M of the PRACH sequence is determined as follows:

    Determine the number of repetitions N of the SEQ group according to the first carrier-to-noise ratio CNR gap, where the first CNR gap refers to the CNR gap between the reference PRACH format corresponding to the first PRACH format and the first link budget;

    and / or,

    Determine the number of repetitions M of the PRACH sequence according to a second CNR gap, where the second CNR gap refers to the CNR gap between the reference PRACH format corresponding to the second PRACH format and the second link budget;

    Wherein, the first link budget and the second link budget are determined according to the link budget corresponding to the scene in which the terminal device is located.
22. The method according to any one of claims 19 to 21, characterized in that the scene is related to at least one of the following parameters: the orbital height of the satellite, the center frequency point where the terminal equipment is located, the satellite and the terminal Elevation angle between devices, channel bandwidth.
23. The method according to any one of claims 15 to 22, characterized in that the SEQ group or the PRACH sequence is determined based on a reference PRACH format, and the reference PRACH format includes at least one of the following: PRACH format 0, PRACH format 1. PRACH format 2, PRACH format 3.
24. The method according to claim 23, characterized in that:

    The SEQ group of PRACH format 0 includes 1 SEQ with a time domain occupation duration of 24576Ts;

    The SEQ group of PRACH format 1 includes 2 SEQs with a time domain occupation duration of 24576Ts;

    The SEQ group of PRACH format 2 includes 4 SEQs with a time domain occupation duration of 24576Ts;

    The SEQ group of PRACH format 3 includes 4 SEQs with a time domain occupation duration of 6144Ts.
25. The method according to any one of claims 15 to 24, characterized in that the time domain occupation duration of the PRACH format is an integer multiple of milliseconds, or an integer multiple of half a millisecond.
26. The method according to claim 25, characterized in that by adjusting the duration of CP and/or GT in the PRACH format, the time domain occupation duration of the PRACH format is an integer multiple of milliseconds, or an integer multiple of half a millisecond. millisecond.
27. The method according to any one of claims 15 to 26, characterized in that the subframe index corresponding to the time domain starting position of the PRACH format is based on the configuration period of the PRACH format and the time domain occupation of the PRACH format. Duration determined.
28. The method according to claim 27, characterized in that when the configuration period of the PRACH format corresponds to k system frames, the time domain starting position of the PRACH format is located at the first k system frames. Within 1 system frame, and the time domain end position of the PRACH format is located within the k-th system frame among the k system frames, and k is a positive integer.
29. A wireless communication device, characterized in that the device includes:

    The sending module is used to send the physical random access channel PRACH format; where,

    The PRACH format includes at least one of the following:

    The first PRACH format including N repeated sequence SEQ groups,

    A second PRACH format including M repeated PRACH sequences.
30. A wireless communication device, characterized in that the device includes:

    The receiving module is used to receive the physical random access channel PRACH format sent by the terminal device; where,

    The PRACH format includes at least one of the following:

    The first PRACH format including N repeated sequence SEQ groups,

    A second PRACH format including M repeated PRACH sequences.
31. A terminal device, characterized in that the terminal device includes a processor and a memory, a computer program is stored in the memory, and the processor executes the computer program to implement the method described in any one of claims 1 to 14 Methods.
32. A network device, characterized in that the network device includes a processor and a memory, a computer program is stored in the memory, and the processor executes the computer program to implement the method described in any one of claims 15 to 28 Methods.
33. A computer-readable storage medium, characterized in that a computer program is stored in the storage medium, and the computer program is used to be executed by a processor to implement the method according to any one of claims 1 to 14, or Implement the method as claimed in any one of claims 15 to 28.
34. A chip, characterized in that the chip includes programmable logic circuits and/or program instructions, and when the chip is run, it is used to implement the method as described in any one of claims 1 to 14, or to implement the method as claimed in claim 1 The method according to any one of claims 15 to 28.
35. A computer program product, characterized in that the computer program product includes computer instructions, the computer instructions are stored in a computer-readable storage medium, and a processor reads and executes the computer instructions from the computer-readable storage medium , to implement the method as described in any one of claims 1 to 14, or to implement the method as described in any one of claims 15 to 28.

Images