CN111867133B

CN111867133B - Random access method, network equipment and terminal equipment

Info

Publication number: CN111867133B
Application number: CN201910359433.9A
Authority: CN
Inventors: 许斌; 李秉肇; 陈磊; 王学龙
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2019-04-26
Filing date: 2019-04-26
Publication date: 2023-01-06
Anticipated expiration: 2039-04-26
Also published as: CN111867133A; WO2020216010A1

Abstract

The embodiment of the application discloses a random access method, network equipment and terminal equipment, which comprises the following steps: the terminal equipment sends a random access lead code to the network equipment; determining a random access-radio network temporary identifier (RA-RNTI) according to at least one of an identifier of a first Orthogonal Frequency Division Multiplexing (OFDM) symbol for sending the random access lead code, an identifier of a frequency domain for sending the random access lead code, an identifier of an uplink carrier for sending the random access lead code and a first identifier, wherein the first identifier is determined according to at least one of a System Frame Number (SFN) for sending the random access lead code, an identifier of a time slot for sending the random access lead code and a first numerical value, and the first numerical value is a positive integer; and receiving a random access response RAR sent by the network equipment according to the RA-RNTI. By adopting the embodiment of the application, when the RAR receiving window is more than 10ms, the calculated RA-RNTI is unique in the RAR receiving window, so that random access is realized.

Description

Random access method, network equipment and terminal equipment

Technical Field

The present application relates to the field of network communication technologies, and in particular, to a random access method, a network device, and a terminal device.

Background

In the wireless communication process, the terminal device needs to obtain uplink synchronization with the network device through a random access process, so as to perform subsequent communication. In the random access process, in a Random Access Response (RAR) receiving window (when the maximum length of the window is 10 ms), the received RA-RNTI (random access-radio network temporary identifier) corresponding to each RAR is unique. However, when the RAR receiving window needs to be extended to a length greater than 10ms, even several tens of milliseconds, the existing calculation method cannot ensure that the calculated RA-RNTI is unique within the extended receiving window, and therefore, multiple UEs may receive the same RAR, which may cause confusion in receiving of random access responses and affect wireless communication.

Disclosure of Invention

The embodiment of the application provides a random access method, network equipment and terminal equipment, and ensures that an RA-RNTI is unique in an RAR receiving window, so that RAR can be correctly received and random access can be successfully carried out.

In a first aspect, an embodiment of the present application provides a random access method, including: the terminal equipment sends a random access lead code to the network equipment; determining a random access-radio network temporary identifier (RA-RNTI) according to at least one of an identifier of a first Orthogonal Frequency Division Multiplexing (OFDM) symbol for sending the random access lead code, an identifier of a frequency domain for sending the random access lead code, an identifier of an uplink carrier for sending the random access lead code and a first identifier, wherein the first identifier is determined according to at least one of a System Frame Number (SFN) for sending the random access lead code, an identifier of a time slot for sending the random access lead code and a first numerical value, and the first numerical value is a positive integer; and finally, receiving a random access response RAR sent by the network equipment according to the RA-RNTI. The PRACH opportunity indicates a time-frequency location where the random access preamble may be sent, where the time-frequency location refers to a location in a time domain and a location in a frequency domain. When the RA-RNTI is calculated, only the RA-RNTI is allocated to the PRACH occase which is configured periodically, and the RA-RNTI is not allocated to the time unit which is not configured with the PRACH occase, so that unnecessary resource waste can be reduced. In addition, the introduction of SFN can ensure that the calculated RA-RNTI is unique in the RAR receiving window when the RAR receiving window is more than 10 ms. Therefore, the RAR can be correctly received, and the random access can be successfully carried out.

In an alternative, RA-RNTI =1+ s _id +14 × t _ id +14 × 10 × 2 ^k ×f_id+14×10×2 ^k ×8×ul_carrier_id，t_id＝ceiling((SFN×10×2 ^k +slot_id)/x)mod(10×2 ^k ) Wherein s _ id is an identifier of a first OFDM symbol, f _ id is an identifier of a frequency domain, ul _ carrier _ id is an identifier of an uplink carrier, t _ id is a first identifier, slot _ id is an identifier of a slot, x is a first numerical value, a ceiling function represents an upward rounding operation, mod represents a remainder operation, and k is used for representing a subcarrier intervalAnd k is an integer of 0 or more. By the calculation formula of RA-RNTI, only RA-RNTI is allocated for PRACH occase configured periodically, and RA-RNTI is not allocated for the time unit without PRACH occase configuration, thus unnecessary resource waste can be reduced. In addition, the introduction of SFN can ensure that the calculated RA-RNTI is unique in the RAR receiving window when the RAR receiving window is more than 10 ms.

In another alternative, RA-RNTI =1+ s_id +14 × t _ id +14 × 80 × f _ id +14 × 80 × 8 × ul _ carrier _ id, where t _ id = ceiling ((SFN _ id × 80+ slot _id)/x) mod (80), where s _ id is an identifier of a first OFDM symbol, f _ id is an identifier of a frequency domain, ul _ carrier _ id is an identifier of an uplink carrier, t _ id is a first identifier, slot _ id is an identifier of a slot, x is a first numerical value, the ceiling function represents an rounding-up operation, and mod represents a remainder operation. In the method, according to the condition that one system frame comprises 80 time slots, only RA-RNTI is allocated to the PRACH occasion which is periodically configured through a calculation formula of the RA-RNTI, and the RA-RNTI is not allocated to the time unit without the PRACH occasion, so that the waste of the RA-RNTI caused by allocating the RA-RNTI to the time unit without the PRACH occasion can be avoided to the maximum extent. In addition, the introduction of the SFN can ensure that the calculated RA-RNTI is unique in a larger RAR receiving window.

In another alternative, the first value is a value of a period of a physical random access channel opportunity, PRACH opportunity, for transmitting a random access preamble. The first numerical value is adopted to be set as a period value, RA-RNTI can be dynamically distributed according to the period length of PRACH occasion, and the flexibility of RA-RNTI calculation is increased.

In another optional manner, the period of the PRACH occasion has a value of periodicity greater than or equal to twice a difference between the maximum one-way propagation delay and the minimum one-way propagation delay, so as to ensure that the network device can distinguish the PRACH occasion corresponding to the received random access preamble.

In another optional manner, the terminal device may receive the RAR sent by the network device according to the calculated RA-RNTI in the RAR reception window, and if the RA-RNTI used by the network device identifier RAR is the same as the RA-RNTI used by the terminal device receiving the RAR, the RAR may be received. Specifically, the network device schedules the RAR using the PDCCH, where Downlink Control Information (DCI) transmitted on the PDCCH is scrambled using an RA-RNTI, and the terminal device can solve a time-frequency position for receiving the RAR according to the RA-RNTI after receiving the DCI, so that the RAR can be correspondingly received.

In another alternative, the length of the RAR receive window is greater than twice the difference equal to the maximum one-way propagation delay minus the minimum one-way propagation delay. The terminal equipment is ensured to receive the RAR in the RAR receiving window.

In another alternative, the length of the RAR receiving window may be equal to twice the difference between the maximum one-way propagation delay minus the minimum one-way propagation delay plus a fixed time value, where the fixed time value may be determined according to indication information in RRC signaling sent by the network device. On one hand, the length of the RAR receiving window needs to consider propagation delay differences from different terminal devices to the network device, and on the other hand, the flexibility of the scheduling time (configured fixed time value) of the network device needs to be considered, so that it is ensured that the terminal device can receive the RAR in the RAR receiving window.

In a second aspect, an embodiment of the present application provides a random access method, including: the terminal equipment sends a random access lead code to the network equipment; determining a random access-wireless network temporary identifier RA-RNTI according to at least one of an identifier of a subframe for sending the random access preamble, an identifier of a frequency domain for sending the random access preamble, an identifier of an uplink carrier for sending the random access preamble, a system frame number SFN for sending the random access preamble and a value of a period of a physical random access channel opportunity PRACH opportunity for sending the random access preamble; and finally, receiving a random access response RAR sent by the network equipment according to the RA-RNTI. When the RA-RNTI is calculated, the PRACH occasions which are periodically configured are changed into the PRACH occasions which are continuous in the time domain, so that the RA-RNTI can be continuously distributed, and the RA-RNTI is not distributed in the unit time without configuring the PRACH occasions, and the calculated RA-RNTI is only in the RAR receiving window when the RAR receiving window is more than 10 ms. Therefore, the RAR can be correctly received, and the random access can be successfully carried out.

In an alternative, RA-RNTI =1+ t _id +10 × f _ id +10 × 2 ^k ul_carrier_id+10×2 ^k X 2 x (SFN scaling/y)), where t _ id is a subframe identifier, f _ id is a frequency domain identifier, ul _ carrier _ id is an uplink carrier identifier, scaling is a periodic value, a scaling function represents an upward rounding operation, mod represents a remainder operation, k is used to represent a subcarrier spacing parameter, k is an integer greater than or equal to 0, and y is a system frame duration. By the calculation formula of the RA-RNTI, the smallest time unit to be considered is assumed to be a subframe, namely, most PRACH Ocvasion can be configured in one subframe, so that the RA-RNTI cannot be distributed to the time unit with finer granularity, and the waste of the RA-RNTI is avoided. And simultaneously, SFN is introduced to distinguish subframes in different SFN, so that the calculated RA-RNTI is unique in the RAR receiving window when the RAR receiving window is more than 10 ms. In addition, in the ceiling (property/y) of the present invention, the meaning of y varies with the unit of property, and assuming that the unit of property is millisecond, the unit of y is also millisecond; and assuming that the unit of periodicity is a subframe, the unit of y is also a subframe, and at this time, since the system frame is 10 subframes, the value of y may be 10. In general, the term periodicity/y means that the length of one period refers to several system frames, and can also be understood as that the length of one period spans several system frames, and all expression ways embodying this idea fall within the scope of the present invention.

In another alternative, RA-RNTI =1+ t_id +10 × f _ id +80ul _carrier _id +80 × 2 × (SFN mod clipping (period/y)), where t _ id is an identification of a subframe, f _ id is an identification of a frequency domain, ul _ carrier _ id is an identifier of an uplink carrier, period is a periodic value, a ceiling function represents rounding-up operation, mod represents remainder operation, and y is the duration of a system frame. According to the condition that one system frame comprises 80 time slots, by means of a calculation formula of RA-RNTI, the minimum time unit to be considered is assumed to be a subframe, namely, at most one PRACH Occasion can be configured in one subframe, so that the RA-RNTI cannot be distributed to the time unit with finer granularity, and waste of the RA-RNTI is avoided. And simultaneously, SFN is introduced to distinguish subframes in different SFN, and the calculated RA-RNTI is only in an RAR receiving window when the RAR receiving window is more than 10 ms.

In another optional manner, the period of the PRACH occase has a period periodicity greater than or equal to twice a difference between the maximum one-way propagation delay and the minimum one-way propagation delay, so as to ensure that the network device can distinguish the PRACH occase corresponding to the received random access preamble.

In another alternative, the length of the RAR receive window is greater than twice the difference equal to the maximum one-way propagation delay minus the minimum one-way propagation delay. The guarantee terminal equipment can receive RAR in the RAR receiving window.

In a third aspect, an embodiment of the present application provides a random access method, including: the network equipment receives a random access lead code sent by the terminal equipment; determining a random access-radio network temporary identifier (RA-RNTI) according to at least one of an identifier of a first Orthogonal Frequency Division Multiplexing (OFDM) symbol of a random access lead code sent by terminal equipment, an identifier of a frequency domain of the random access lead code sent by the terminal equipment, an identifier of an uplink carrier of the random access lead code sent by the terminal equipment and a first identifier, wherein the first identifier is determined according to at least one of a System Frame Number (SFN) of the random access lead code sent by the terminal equipment, an identifier of a time slot of the random access lead code sent by the terminal equipment and a first numerical value, and the first numerical value is a positive integer; and finally, sending a Random Access Response (RAR) to the terminal equipment, wherein the RAR is identified by the RA-RNTI. When the RA-RNTI is calculated, only the RA-RNTI is allocated to the PRACH occasion configured periodically, and the RA-RNTI is not allocated to the time unit without the PRACH occasion, so that unnecessary resource waste can be reduced. In addition, the introduction of SFN can ensure that the calculated RA-RNTI is unique in the RAR receiving window when the RAR receiving window is more than 10 ms.

In an alternative, RA-RNTI =1+ s _id +14 × t _ id +14 × 10 × 2 ^k ×f_id+14×10×2 ^k ×8×ul_carrier_id，t_id＝ceiling((SFN×10×2 ^k +slot_id)/x)mod(10×2 ^k ) Wherein s _ id is an identifier of a first OFDM symbol, f _ id is an identifier of a frequency domain, ul _ carrier _ id is an identifier of an uplink carrier, t _ id is a first identifier, slot _ id is an identifier of a slot, x is a first numerical value, a ceiling function represents an upward rounding operation, mod represents a remainder operation, k is used for representing a subcarrier spacing parameter, and k is an integer greater than or equal to 0. By the calculation formula of RA-RNTI, only RA-RNTI is allocated for PRACH occase configured periodically, and RA-RNTI is not allocated for the time unit without PRACH occase configuration, thus unnecessary resource waste can be reduced. In addition, the introduction of SFN can ensure that the calculated RA-RNTI is unique in the RAR receiving window when the RAR receiving window is more than 10 ms.

In another optional manner, RA-RNTI =1+ s_id +14 × t _ id +14 × 80 × f _ id +14 × 80 × 8 × ul _ carrier _ id, where t _ id = ceiling ((SFN _ id × 80+ slot _id)/x) mod (80), where s _ id is an identifier of a first OFDM symbol, f _ id is an identifier of a frequency domain, ul _ carrier _ id is an identifier of an uplink carrier, t _ id is a first identifier, slot _ id is an identifier of a slot, x is a first numerical value, ceiling function represents rounding-up operation, and mod represents remainder operation. In the method, according to the condition that one system frame comprises 80 time slots, only RA-RNTI is allocated to the PRACH occasion which is periodically configured through a calculation formula of the RA-RNTI, and the RA-RNTI is not allocated to the time unit without the PRACH occasion, so that the waste of the RA-RNTI caused by allocating the RA-RNTI to the time unit without the PRACH occasion can be avoided to the maximum extent. In addition, the introduction of SFN can ensure that the calculated RA-RNTI is unique in the RAR receiving window when the RAR receiving window is more than 10 ms.

In another alternative, the first value is a value of a period of a physical random access channel opportunity, PRACH opportunity, for transmitting a random access preamble. The complexity of calculating the RA-RNTI is reduced.

In another alternative, the network device may broadcast the maximum one-way propagation delay and the minimum one-way propagation delay, or may send indication information to the terminal device through RRC signaling, where the indication information is used to notify the maximum one-way propagation delay and the minimum one-way propagation delay between the terminal device and the network device. The terminal equipment can determine the period value periodicity of the PRACH occase according to the maximum one-way propagation delay and the minimum one-way propagation delay.

In a fourth aspect, an embodiment of the present application provides a random access method, including: the network equipment receives a random access lead code sent by the terminal equipment; determining a random access-radio network temporary identifier RA-RNTI according to at least one of an identifier of a subframe of a random access preamble sent by a terminal device, an identifier of a frequency domain of the random access preamble sent by the terminal device, an identifier of an uplink carrier of the random access preamble sent by the terminal device, a system frame number SFN of the random access preamble sent by the terminal device and a value of a period of a physical random access channel opportunity PRACH opportunity of the random access preamble sent by the terminal device; and finally, sending a Random Access Response (RAR) to the terminal equipment, wherein the RAR is identified by the RA-RNTI. When the RA-RNTI is calculated, only the RA-RNTI is allocated to the PRACH occase which is configured periodically, and the RA-RNTI is not allocated to the time unit which is not configured with the PRACH occase, so that unnecessary resource waste can be reduced. In addition, the introduction of SFN can ensure that the calculated RA-RNTI is unique in the RAR receiving window when the RAR receiving window is more than 10 ms.

In another alternative, RA-RNTI =1+ t _id +10 × f _ id +10 × 2 ^k ul_carrier_id+10×2 ^k X 2 x (SFN _ periodicity/y)), wherein t _ id is a subframe identifier, f _ id is a frequency domain identifier, ul _ carrier _ id is an uplink carrier identifier, periodicity is a periodic value, a periodicity function represents an upward rounding operation, mod represents a remainder operation, k is used for representing a subcarrier interval parameter, k is an integer greater than or equal to 0, and y is a system frame duration. By the calculation formula of the RA-RNTI, the smallest time unit to be considered is assumed to be a subframe, namely, at most one PRACH occasion can be configured in one subframe, so that the RA-RNTI cannot be distributed to the time unit with finer granularity, and the waste of the RA-RNTI is avoided. And simultaneously, SFN is introduced to distinguish subframes in different SFN, so that the calculated RA-RNTI is unique in a larger RAR receiving window.

In another alternative, RA-RNTI =1+ t_id +10 × f _ id +80ul _carrier _id +80 × 2 × (SFN mod clipping (period/y)), where t _ id is an identifier of a subframe, f _ id is an identifier of a frequency domain, ul _ carrier _ id is an identifier of an uplink carrier, period is a periodic value, a ceiling function represents rounding-up operation, mod represents remainder operation, and y is the duration of a system frame. According to the condition that one system frame comprises 80 time slots, the minimum time unit to be considered is assumed to be a subframe through a calculation formula of RA-RNTI, namely, at most one PRACH Ocvasion can be configured in one subframe, so that the RA-RNTI cannot be distributed to the time unit with finer granularity, and the waste of the RA-RNTI is avoided. And simultaneously, SFN is introduced to distinguish subframes in different SFN, so that the calculated RA-RNTI is unique in a larger RAR receiving window.

In a fifth aspect, the present invention provides a terminal device, configured to implement the methods and functions performed by the terminal device in the first and second aspects, and implemented by hardware/software, where the hardware/software includes modules corresponding to the functions.

In a sixth aspect, the present application provides a network device, where the network device is configured to implement the methods and functions performed by the network device in the third and fourth aspects, and is implemented by hardware/software, where the hardware/software includes modules corresponding to the functions.

In a seventh aspect, an embodiment of the present application provides another terminal device, including: the random access method includes a processor, a memory and a communication bus, where the communication bus is used to implement connection communication between the processor and the memory, and the processor executes a program stored in the memory to implement the steps in the random access method provided by the first aspect and the second aspect.

In one possible design, the terminal device provided by the present application may include a module for performing the behavior correspondence of the terminal device in the above method design. The modules may be software and/or hardware.

In an eighth aspect, an embodiment of the present application provides another network device, including: a processor, a memory and a communication bus, wherein the communication bus is used for implementing connection communication between the processor and the memory, and the processor executes a program stored in the memory for implementing the steps in the random access method provided by the third and fourth aspects.

In one possible design, the network device provided by the present application may include a module for performing the behavior correspondence of the network device in the above method design. The modules may be software and/or hardware.

In a ninth aspect, the present application provides a computer-readable storage medium having stored therein instructions, which when run on a computer, cause the computer to perform the method of the above aspects.

In a tenth aspect, the present application provides a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of the above aspects.

In an eleventh aspect, an embodiment of the present application provides a communication system, which includes the terminal device in the fifth aspect and the seventh aspect, and the network device in the sixth aspect and the eighth aspect.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments or the background art of the present application, the drawings required to be used in the embodiments or the background art of the present application will be described below.

Fig. 1 is a schematic architecture diagram of a communication system according to an embodiment of the present application;

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

fig. 3 is a schematic diagram of an NTN scenario provided in an embodiment of the present application;

fig. 4 is a schematic configuration diagram of a PRACH occasion period according to an embodiment of the present disclosure;

fig. 5 is a flowchart of another wireless access method provided in an embodiment of the present application;

fig. 6 is a schematic structural diagram of a terminal device according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of a network device according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of another terminal device provided in an embodiment of the present application;

fig. 9 is a schematic structural diagram of another network device according to an embodiment of the present application.

Detailed Description

The embodiments of the present application are described below with reference to the drawings.

As shown in fig. 1, fig. 1 is a schematic structural diagram of a communication system according to an embodiment of the present application. The communication system 100 may include a network device 110 and terminal devices 101 to 106. It should be understood that more or fewer network devices or terminal devices may be included in the communication system 100. The network device or the terminal device may be hardware, or may be functionally divided software, or a combination of the two. In addition, the terminal devices 104 to 106 may also form a communication system, for example, the terminal device 105 may send downlink data to the terminal device 104 or the terminal device 106. The network device and the terminal device can communicate through other devices or network elements. The network device 110 may transmit downlink data to the terminal devices 101 to 106, or may receive uplink data transmitted by the terminal devices 101 to 106. Of course, terminal devices 101 to 106 may transmit uplink data to network device 110, or may receive downlink data transmitted by network device 110. End devices 101-106 may be User Equipments (UEs), cellular phones, smart phones, laptops, handheld communication devices, handheld computing devices, satellite radios, global positioning systems, personal Digital Assistants (PDAs), and/or any other suitable device for communicating over wireless communication system 100, among others. Network device 110 may be a device for communicating with a terminal device, and may be an access point, a relay node, a Base Transceiver Station (BTS), a Node B (NB), an evolved node B (eNB), or a 5G base station (gNB), which refers to a device in an access network that communicates with a terminal device over an air interface through one or more sectors.

The communication system 100 may employ a Public Land Mobile Network (PLMN), a device-to-device (D2D) network, a machine-to-machine (M2M) network, an internet of things (IoT), or other networks. The communication system 100 may be applied to a New Radio (NR) system of the fifth generation mobile communication technology (5 th generation,5 g), and may also be applied to a non-terrestrial communication network, for example, a communication network in which a base station is located on a satellite or other flight equipment, or a communication network in which a satellite or flight equipment is used as a relay. The method can also be applied to a 5G architecture-based scene for communication by using an unlicensed spectrum.

The embodiment of the application relates to a random access process, which is introduced as follows:

the terminal device first sends a Random Access Preamble (RAP) to the network device, and after the terminal device sends the RAP, an RA-RNTI may be calculated. After receiving the random access preamble, the network device determines that the terminal device requests random access, can estimate a transmission delay between the terminal device and the network device, and can also calculate an RA-RNTI (random access response, RAR), and then sends a Random Access Response (RAR) to the terminal device, and identifies the RAR using the RA-RNTI. The terminal device monitors a Physical Downlink Control Channel (PDCCH) in the RAR reception window, decodes the DCI using the RA-RNTI calculated by the terminal device, and then receives a corresponding RAR. The RAR can be correctly received if the RA-RNTI used by the network device identity RAR is the same as the RA-RNTI used by the terminal device to receive the RAR. If the RAR cannot be correctly received, it means that the RAR sent by the network device is not received in the RAR receiving window, and it is determined that the random access procedure fails.

In the random access procedure, the value of RA-RNTI is determined by the time-frequency position of the physical random access channel opportunity (PRACH) of the random access preamble. The time-frequency position refers to a position of the random access preamble code in a time domain and a position of the random access preamble code in a frequency domain. After the terminal equipment sends the random access lead code, an RA-RNTI can be calculated according to information such as time-frequency position of sending the random access lead code, and then the corresponding RAR is received according to the RA-RNTI in an RAR time window. The RA-RNTI corresponds to the PRACH occase one by one, and the terminal equipment determines the random access preamble sent by which PRACH occase, so that one RA-RNTI can be calculated. After the network equipment receives the random access preamble, the same RA-RNTI can be calculated according to the time-frequency position of the PRACH occasion, and the RAR passes through the RA-RNTI identification.

The calculation formula of the RA-RNTI is as follows: RA-RNTI =1+ s \ u id +14 × t _ id +14 × 80 × f _ id +14 × 80 × 8 × ul _ carrier _ id, where s _ id represents an identifier (0 ≦ s _ id < 14) of a first Orthogonal Frequency Division Multiplexing (OFDM) symbol of the random access preamble, t _ id is an identifier of a time slot in which the random access preamble is transmitted (0 ≦ t _ id < 80), f _ id is an identifier of a frequency domain in which the random access preamble is transmitted (0 ≦ f _ id < 8), and ul _ carrier _ id is an identifier of an uplink carrier in which the random access preamble is transmitted (0 or 1).

The RA-RNTI calculated by the calculation formula can ensure that the RA-RNTI corresponding to each RAR received in one RAR receiving window (the maximum length is 10 ms) is unique. That is, in a RAR reception window of 10ms, the RAR received in each unit time corresponds to a unique RA-RNTI. If there are 100 unit times within the RAR reception window of 10ms, there are 100 RA-RNTIs. If the RAR receive window extends to 20ms in length, there are 200 units of time, in which case 100 RA-RNTIs cannot guarantee a unique RA-RNTI per unit of time. In some communication scenarios, such as unlicensed spectrum communication scenarios or non-terrestrial network (NTN) scenarios, the RAR receive window needs to be extended to a length greater than 10ms, even tens of milliseconds. The existing calculation method cannot ensure that the calculated RA-RNTI is unique in the expanded receiving window, so that the multiple UEs may receive the same RAR, the receiving of random access response is disordered, and wireless communication is affected. In order to solve the above technical problem, embodiments of the present application provide the following solutions.

As shown in fig. 2, fig. 2 is a flowchart illustrating a radio access method according to an embodiment of the present application. The steps in the implementation of the present application include at least:

s201, the terminal equipment sends a random access lead code to the network equipment, and the network equipment receives the random access lead code sent by the terminal equipment.

S202, the terminal equipment determines a random access-radio network temporary identifier (RA-RNTI) according to at least one of an identifier of a first Orthogonal Frequency Division Multiplexing (OFDM) symbol for sending the random access preamble, an identifier of a frequency domain for sending the random access preamble, an identifier of an uplink carrier for sending the random access preamble and a first identifier, wherein the first identifier is determined according to at least one of a System Frame Number (SFN) for sending the random access preamble, an identifier of a time slot for sending the random access preamble and a first numerical value, and the first numerical value is a positive integer. The following options are included:

in an alternative, RA-RNTI =1+ s _id +14 × t _ id +14 × 10 × 2 ^k ×f_id+14×10×2 ^k ×8×ul_carrier_id，t_id＝ceiling((SFN×10×2 ^k +slot_id)/x)mod(10×2 ^k ) Wherein the s _ id is the identifier of the first OFDM symbol, and s _ id is more than or equal to 0<14. The f _ id is the identifier of the frequency domain, and f _ id is more than or equal to 0<8. The ul _ carrier _ id is an identifier of the uplink carrier, and ul _ carrier _ id =0 or 1. The t _ id is the first identifier, and t _ id is more than or equal to 0<10×2 ^k， The slot _ id is the identifier of the time slot, and the slot _ id is not less than 0<80. The x is the first value, the first value may be a period of a physical random access channel opportunity PRACH opportunity that sends a random access preamble, or may be a positive integer assigned, and a unit of the first value is a time slot. The ceiling function represents an rounding-up operation, mod represents a remainder operation, k is used for representing a sub-carrier space (SCS), and k is an integer greater than or equal to 0. When k =0, SCS =15 × 2 is represented ⁰ =15kHz, when k =1, denotes SCS =15 × 2 ¹ =30kHz, and so on.

With the above calculation formula, in case that the system frame includes 80 slots, that is, k =3, RA-RNTI =1+ s_id +14 × t _ id +14 × 10 × 8 × f _ id +14 × 80 × 8 × ul _ carrier _ id, t _ id = ceiling ((SFN × 80+ slot _)/x) mod (80). Further, the first value x may be a period value period of a PRACH occase where the random access preamble is transmitted, and in a case where the period value configuration of the PRACH occase is shortest, that is, x =2, RA-RNTI =1+ s_id +14 × t _ id +14 × 10 × 8 × f _ id +14 × 80 × 8 × ul _ carrier _ id, and t _ id = ceiling ((SFN × 80 slot id)/2) mod (80). It should be noted that when x =1, t _ id = ceiling (SFN × 80+ slot _id) mod (80) = slot _ id, which is obtained by substituting the above calculation formula: RA-RNTI =1+ s \ u id +14 × slot _ id +14 × 10 × 8 × f _ id +14 × 80 × 8 × ul _ carrier _ id, the same as the calculation formula of RA-RNTI given earlier when the length of RAR reception window is not greater than 10 ms. Therefore, the RA-RNTI calculated in the embodiment of the present application can satisfy both the case that the length of the RAR receiving window is not greater than 10ms and the case that the length of the RAR receiving window is greater than 10 ms.

The embodiments of the present application also provide several other situations, including:

when k =2, RA-RNTI =1+ s _id +14 × 10 × 4 × f _ id +14 × 40 × 8 × ul _ carrier _ id, t _ id = ceiling ((SFN × 40+ slot _id)/x) mod (40).

When k =1, RA-RNTI =1+ s \ u id +14 × t _ id +14 × 20 × f _ id +14 × 20 × 8 × ul _ carrier _ id, t _ id = ceiling ((SFN × 20+ slot \ u id)/x) mod (20).

When k =0, RA-RNTI =1+ s \ u id +14 × t _ id +14 × 10 × f _ id +14 × 10 × 8 × ul _ carrier _ id, t _ id = ceiling ((SFN × 10+ slot \ u id)/x) mod (10).

In another alternative, the embodiments of the present application also provide several calculation formulas of RA-RNTI independent of k, including at least:

RA-RNTI =1+ s \ u id +14 × t _ id +14 × 80 × f _ id +14 × 80 × 8 × ul _ carrier _ id, wherein t _ id = ceiling ((SFN _ id × 80+ slot \ u id)/x) mod (80), wherein s _ id is the identity of the first OFDM symbol and 0 ≦ s _ id <14. The f _ id is the identification of the frequency domain, and f _ id is more than or equal to 0 and less than 8. Ul _ carrier _ id is the identifier (0 or 1) of the uplink carrier, t _ id is the first identifier, slot _ id is the identifier of the slot, and slot _ id is not less than 0 and is less than 80. The x is the first numerical value, the ceiling function represents an upward rounding operation, and the mod represents a complementation operation.

RA-RNTI =1+ s + u id +14 × t _ id +14 × 10 × 4 × f _ id +14 × 40 × 8 × ul _ carrier _ id, where t _ id = ceiling ((SFN × 40+ slot _id)/x) mod (40).

RA-RNTI =1+ s _id +14 × t _ id +14 × 20 × f _ id +14 × 20 × 8 × ul _ carrier _ id, where t _ id = ceiling ((SFN × 20+ slot _id)/x) mod (20).

RA-RNTI =1+ s + u id +14 × t _ id +14 × 10 × f _ id +14 × 10 × ul _ carrier _ id, where t _ id = ceiling ((SFN × 10+ slot_id)/x) mod (10).

Optionally, the first value may be a period of a physical random access channel opportunity PRACH opportunity that transmits the random access preamble. The period of the PRACH occase is greater than or equal to twice the difference between the maximum one-way propagation delay and the minimum one-way propagation delay, so that the network device can distinguish the PRACH occase corresponding to the received random access preamble. Specifically, the network device may broadcast the maximum one-way propagation delay and the minimum one-way propagation delay, or may send indication information to the terminal device through Radio Resource Control (RRC) signaling, where the indication information is used to notify the maximum one-way propagation delay and the minimum one-way propagation delay between the terminal device and the network device. The terminal device may determine the period of the PRACH occasting according to the maximum one-way propagation delay and the minimum one-way propagation delay.

For example, as shown in fig. 3, in an NTN scenario, because the distance difference between a base station and different UEs is large, propagation delays from different UEs to the base station may be very different in the same cell, and therefore, all UEs at different positions within the signal coverage range of the same base station need to be considered in both the time-frequency position of the PRACH interference of the random access preamble and the RAR receiving window. In practical application, only the UE farthest from the base station and the UE closest to the base station may be considered, the maximum time delay of the one-way propagation may be determined according to the distance between the farthest UE and the base station, and the minimum time delay of the one-way propagation may be determined according to the distance between the closest UE and the base station. Other UEs are included in this range.

As shown in fig. 4, fig. 4 is a schematic configuration diagram of a PRACH interference period according to an embodiment of the present application. If the period of the PRACH occase is not less than (maximum one-way propagation delay-minimum one-way propagation delay) × 2 and the period of the PRACH occase is greater than or equal to the length of the receiving window of the base station for receiving the random access preamble, the receiving window 1 and the receiving window 2 of the base station for receiving the random access preamble may be staggered, and if the period of the PRACH occase is less than (maximum one-way propagation delay-minimum one-way propagation delay) × 2, the starting position of the receiving window 2 needs to be moved forward, resulting in an overlapping region between the receiving window 1 and the receiving window 2. If the base station receives the random access preamble transmitted by the terminal device in the overlapping area, it cannot determine which PRACH occasion the random access preamble is transmitted from. Therefore, only in the case where the periodicity is not less than (maximum one-way propagation delay — minimum one-way propagation delay) × 2 and the value of the period of the PRACH occasion is equal to or greater than the length of the reception window in which the base station receives the random access preamble, it can be ensured that only one random access preamble is received in each random access preamble reception window.

After receiving the random access preamble, the network device may determine a random access-radio network temporary identifier RA-RNTI according to at least one of an identifier of a first orthogonal frequency division multiplexing OFDM symbol of the random access preamble sent by the terminal device, an identifier of a frequency domain of the random access preamble sent by the terminal device, an identifier of an uplink carrier of the random access preamble sent by the terminal device, and a first identifier, where the first identifier is determined according to at least one of a system frame number SFN of the random access preamble sent by the terminal device, an identifier of a time slot of the random access preamble sent by the terminal device, and a first value, and the first value is a positive integer. The specific method for the network device to calculate the RA-RNTI is the same as the method for the terminal device to calculate the RA-RNTI, and is not described herein again. The network equipment can identify the RAR through the calculated RA-RNTI and then send the RAR identified by the RA-RNTI to the terminal equipment. Specifically, the RAR is identified by the RA-RNTI, which may be that the network device schedules the RAR by using the PDCCH, wherein DCI transmitted on the PDCCH is scrambled by using the RA-RNTI.

S203, the network equipment sends a random access response RAR to the terminal equipment, and the terminal equipment receives the random access response RAR sent by the network equipment according to the RA-RNTI.

In a specific implementation, the terminal device may receive, in the RAR receiving window, the RAR sent by the network device according to the calculated RA-RNTI, and if the RA-RNTI used by the network device identifier RAR is the same as the RA-RNTI used by the terminal device for receiving the RAR, the RAR may be received. Specifically, the network device schedules the RAR by using the PDCCH, wherein DCI transmitted on the PDCCH is scrambled by using an RA-RNTI, and the terminal device can solve the time-frequency position for receiving the RAR according to the RA-RNTI after receiving the DCI, so that the RAR can be correspondingly received. The length of the RAR receiving window is greater than or equal to twice the difference between the maximum one-way propagation delay and the minimum one-way propagation delay, or greater than twice the difference between the maximum one-way propagation delay and the minimum one-way propagation delay plus a fixed time value, where the fixed time value may be determined according to indication information in an RRC signaling sent by the network device. A first time difference between the time when the UE sends the random access preamble and the time when the UE receives the RAR may be greater than or equal to one-way propagation delay × 2, the fixed time value may be a time difference between the time when the base station receives the random access preamble and the time when the base station sends the RAR, and the fixed time value is greater than or equal to 0. For different UEs in a cell, due to the difference in one-way propagation delay from the base station, the maximum difference of the first time difference between different UEs is twice the difference of the maximum one-way propagation delay minus the minimum one-way propagation delay. Taking twice the minimum one-way propagation delay of the UE closest to the base station as a compensation value, the time of the RAR receiving window of the UE should be greater than or equal to twice the difference between the maximum one-way propagation delay minus the minimum one-way propagation delay plus a fixed time value. And taking the fixed time value added to twice the minimum one-way propagation delay of the UE closest to the base station as a compensation value, wherein the time of the RAR receiving window of the UE is more than or equal to twice the difference value obtained by subtracting the minimum one-way propagation delay from the maximum one-way propagation delay. If the length of the RAR receiving window is less than twice the difference between the maximum one-way propagation delay and the minimum one-way propagation delay, the RAR receiving window is already closed in the RAR propagation process, so that the RAR cannot be received.

In the embodiment of the application, when the RA-RNTI is calculated, only the RA-RNTI is allocated to the PRACH occasion configured periodically, and the RA-RNTI is not allocated to the time unit without the PRACH occasion configuration, so that unnecessary resource waste can be reduced. In addition, due to the introduction of the SFN, when the RAR receiving window is larger than 10ms, the calculated RA-RNTI is unique in the RAR receiving window, and the number of the RA-RNTIs is not increased, so that RAR can be correctly received, and random access can be successfully carried out.

As shown in fig. 5, fig. 5 is a flowchart illustrating another radio access method according to an embodiment of the present application. The steps in the implementation of the present application include at least:

s501, the terminal device sends a random access lead code to the network device, and the network device receives the random access lead code sent by the terminal device.

S502, the terminal equipment determines a random access-radio network temporary identifier (RA-RNTI) according to at least one of an identifier of a subframe for sending the random access preamble, an identifier of a frequency domain for sending the random access preamble, an identifier of an uplink carrier for sending the random access preamble, a System Frame Number (SFN) for sending the random access preamble and a value of a period of a physical random access channel opportunity (PRACOCCASion) for sending the random access preamble. The method comprises the following several optional modes:

in an alternative, RA-RNTI =1+ t _id +10 × f _ id +10 × 2 ^k ul_carrier_id+10×2 ^k X 2 x (SFN _ conditional), where t _ id is the identifier of the subframe, and t _ id is greater than or equal to 0 and less than or equal to t _ id<10. F _ id is the identifier of the frequency domain, and f _ id is more than or equal to 0<8. The ul _ carrier _ id is an identifier of the uplink carrier, and is equal to 0 or 1. Periodicity is the value of the period in subframes (subframes). The ceiling function represents an rounding-up operation, mod represents a remainder operation, k is used for representing a subcarrier spacing parameter, k is an integer greater than or equal to 0, y is a duration of a system frame, and a unit is ms, for example, y may be 10. When k =0, SCS =15 × 2 is represented ⁰ =15kHz, representing SCS =15 × 2 when k =1 ¹ =30kHz, and so on.

With the above calculation formula, in the case that the system frame includes 80 slots, that is, k =3, RA-RNTI =1+ t_id +10 × f _ id +10 × 8 × ul _ carrier _ id +80 × 2 × (SFN mode (periodicity/y)). The embodiments of the present application also provide several other situations, including:

when k =2, RA-RNTI =1+ t _id +10 × f _ id +10 × 4 × ul _ carrier _ id +40 × 2 × (SFN mod decorating (period/y)).

When k =1, RA-RNTI =1+ t _id +10 × f _ id +10 × 2 × ul _ carrier _ id +20 × 2 × (SFN mod ceiling (period/y)).

When k =0, RA-RNTI =1+ t _id +10 × f _ id +10 × ul _ carrier _ id +10 × 2 × (SFN modiling (period/y)).

RA-RNTI =1+ t \ u id +10 × f _ id +80ul _carrier _id +80 × 2 x (SFN mod clipping (periodicity/y)), wherein t _ id is the identifier of the subframe, and 0 ≦ t _ id <10. And f _ id is the identifier of the frequency domain, and f _ id is more than or equal to 0 and less than 8. Ul _ carrier _ id is the identification of the uplink carrier, ul _ carrier _ id is equal to 0 or 1, and period is the value of the period. The ceiling function represents an rounding-up operation, mod represents a remainder operation, y is a duration of a system frame and is in ms, for example, y may be 10.

RA-RNTI＝1+t_id+10×f_id+10×4×ul_carrier_id+40×2×(SFN mod ceiling(periodicity/y))。

RA-RNTI＝1+t_id+10×f_id+10×2×ul_carrier_id+20×2×(SFN mod ceiling(periodicity/y))。

RA-RNTI＝1+t_id+10×f_id+10×ul_carrier_id+10×2×(SFN mod ceiling(periodicity/y))。

It should be noted that, in some scenarios (e.g., NTN scenarios), the period of the PRACH occase cannot be configured to a symbol or even a time slot with a short time granularity in the time domain, and it is likely that only one PRACH occase can be configured on one subframe at most, so that parameters representing the symbol and the time slot need not be embodied when calculating the RA-RNTI, and only the subframe granularity needs to be embodied. In the embodiment of the application, RA-RNTI is calculated on the granularity of the sub-frames.

The period of the PRACH occase is greater than or equal to twice the difference between the maximum one-way propagation delay and the minimum one-way propagation delay, so that the network device can distinguish the PRACH occase corresponding to the received random access preamble. Specifically, the network device may broadcast the maximum one-way propagation delay and the minimum one-way propagation delay, and may also send indication information to the terminal device through an RRC signaling, where the indication information is used to notify the maximum one-way propagation delay and the minimum one-way propagation delay between the terminal device and the network device. The terminal device may determine the period value periodicity of the PRACH occasion according to the maximum one-way propagation delay and the minimum one-way propagation delay.

For example, as shown in fig. 3, in an NTN scenario, because the distance difference between a base station and different UEs is large, propagation delays from different UEs to the base station may be very different in the same cell, and therefore, all UEs in different positions within a signal coverage range of the same base station need to be considered in both a time-frequency position of PRACH interference of a random access preamble and a RAR reception window. In practical application, only the UE farthest from the base station and the UE closest to the base station may be considered, the maximum time delay of the one-way propagation may be determined according to the distance between the farthest UE and the base station, and the minimum time delay of the one-way propagation may be determined according to the distance between the closest UE and the base station. Other UEs are included in this range.

As shown in fig. 4, if the period of the PRACH ocperiphery is not less than (maximum one-way propagation delay-minimum one-way propagation delay) × 2, and the period of the PRACH ocperiphery is greater than or equal to the length of the receiving window of the base station for receiving the random access preamble, the receiving window 1 and the receiving window 2 of the PRACH ocperiphery of the base station for receiving the random access preamble may be staggered, and if the period of the PRACH ocperiphery is less than (maximum one-way propagation delay-minimum one-way propagation delay) × 2, the starting position of the receiving window 2 needs to be moved forward, resulting in an overlapping region between the receiving window 1 and the receiving window 2. If the base station receives the random access preamble transmitted by the terminal device in the overlapping area, it cannot determine which PRACH occasion the random access preamble is transmitted from. Therefore, only in the case where the periodicity is not less than (maximum one-way propagation delay — minimum one-way propagation delay) × 2 and the value of the period of the PRACH occasion is equal to or greater than the length of the reception window in which the base station receives the random access preamble, it can be ensured that only one random access preamble is received in each random access preamble reception window.

After receiving the random access preamble, the network device may determine the random access-radio network temporary identifier RA-RNTI according to at least one of an identifier of a subframe in which the terminal device transmits the random access preamble, an identifier of a frequency domain in which the terminal device transmits the random access preamble, an identifier of an uplink carrier in which the terminal device transmits the random access preamble, a system frame number SFN in which the terminal device transmits the random access preamble, and a value of a period of a physical random access channel opportunity PRACH opportunity in which the terminal device transmits the random access preamble. The specific method for the network device to calculate the RA-RNTI is the same as the method for the terminal device to calculate the RA-RNTI, and is not described herein again. The network equipment can identify the RAR through the calculated RA-RNTI and then send the RAR identified by the RA-RNTI to the terminal equipment. Specifically, the RAR is identified by the RA-RNTI, which may be used by the network device to schedule the RAR using the PDCCH, wherein DCI transmitted on the PDCCH is scrambled using the RA-RNTI.

S503, the network equipment sends a random access response RAR to the terminal equipment, and the terminal equipment receives the random access response RAR sent by the network equipment according to the RA-RNTI.

In a specific implementation, the terminal device may receive, in the RAR receiving window, the RAR sent by the network device according to the calculated RA-RNTI, and if the RA-RNTI used by the network device identifier RAR is the same as the RA-RNTI used by the terminal device for receiving the RAR, the RAR may be received. Specifically, the network device schedules the RAR by using the PDCCH, wherein DCI transmitted on the PDCCH is scrambled by using an RA-RNTI, and the terminal device can solve the time-frequency position of receiving the RAR according to the RA-RNTI after receiving the DCI, so that the RAR can be correspondingly received. The length of the RAR receiving window is greater than or equal to twice the difference between the maximum one-way propagation delay and the minimum one-way propagation delay, or greater than twice the difference between the maximum one-way propagation delay and the minimum one-way propagation delay plus a fixed time value, where the fixed time value may be determined according to indication information in an RRC signaling sent by the network device. A first time difference between the time when the UE sends the random access preamble and the time when the UE receives the RAR may be greater than or equal to one-way propagation delay × 2, the fixed time value may be a time difference between the time when the base station receives the random access preamble and the time when the base station sends the RAR, and the fixed time value is greater than or equal to 0. For different UEs in a cell, the maximum difference of the first time difference between different UEs is twice the difference of the maximum one-way propagation delay minus the minimum one-way propagation delay due to the difference of the one-way propagation delay from the base station. Taking twice the minimum one-way propagation delay of the UE closest to the base station as a compensation value, the time of the RAR receiving window of the UE should be greater than or equal to twice the difference between the maximum one-way propagation delay minus the minimum one-way propagation delay plus a fixed time value. And taking the fixed time value added to twice the minimum one-way propagation delay of the UE closest to the base station as a compensation value, wherein the time of the RAR receiving window of the UE is more than or equal to twice the difference value obtained by subtracting the minimum one-way propagation delay from the maximum one-way propagation delay. If the length of the RAR receiving window is less than twice the difference between the maximum one-way propagation delay and the minimum one-way propagation delay, the RAR receiving window is already closed in the RAR propagation process, so that the RAR cannot be received.

In the embodiment of the application, through a calculation formula of the RA-RNTI, the smallest time unit to be considered is assumed to be a subframe, that is, only one PRACH Occasion can be configured in one subframe at most, so that the RA-RNTI cannot be allocated to a time unit with a finer granularity, and the waste of the RA-RNTI is avoided. And simultaneously, SFN is introduced to distinguish subframes in different SFN, and the calculated RA-RNTI is only in an RAR receiving window when the RAR receiving window is more than 10 ms. Therefore, the RAR can be correctly received, and the random access can be successfully carried out.

The method of the embodiments of the present application is set forth above in detail and the apparatus of the embodiments of the present application is provided below.

Referring to fig. 6, fig. 6 is a schematic structural diagram of a terminal device according to an embodiment of the present disclosure, where the terminal device may include a sending module 601, a processing module 602, and a receiving module 603, where details of each module are described below.

A sending module 601, configured to send a random access preamble to a network device.

A processing module 602, configured to determine a random access-radio network temporary identifier RA-RNTI according to at least one of an identifier of a first orthogonal frequency division multiplexing OFDM symbol used for transmitting the random access preamble, an identifier of a frequency domain used for transmitting the random access preamble, an identifier of an uplink carrier used for transmitting the random access preamble, and a first identifier, where the first identifier is determined according to at least one of a system frame number SFN used for transmitting the random access preamble, an identifier of a time slot used for transmitting the random access preamble, and a first value, and the first value is a positive integer.

A receiving module 603, configured to receive a random access response RAR sent by the network device according to the RA-RNTI.

Wherein RA-RNTI =1+ s_id +14 × t _ id +14 × 10 × 2 ^k ×f_id+14×10×2 ^k ×8×ul_carrier_id，t_id＝ceiling((SFN×10×2 ^k +slot_id)/x)mod(10×2 ^k ) Wherein s _ id is an identifier of the first OFDM symbol, f _ id is an identifier of the frequency domain, ul _ carrier _ id is an identifier of the uplink carrier, t _ id is the first identifier, slot _ id is an identifier of the slot, x is the first numerical value, the ceiling function represents an upward rounding operation, mod represents a remainder operation, and k is used for representing a subcarrier spacing parameter,and k is an integer greater than or equal to 0.

Wherein RA-RNTI =1+ s_id +14 × t _ id +14 × 80 × f _ id +14 × 80 × 8 × ul _ carrier _ id, wherein t _ id = ceiling ((SFN _ id × 80+ slot _id)/x) mod (80), wherein s _ id is an identifier of the first OFDM symbol, f _ id is an identifier of the frequency domain, ul _ carrier _ id is an identifier of the uplink carrier, t _ id is the first identifier, slot _ id is an identifier of the slot, x is the first numerical value, the ceiling function represents an rounding-up operation, and mod represents a remainder operation.

Wherein the first value is a value of a period of a physical random access channel opportunity (PRACH occase) for sending the random access preamble.

In another embodiment:

a sending module 601, configured to send a random access preamble to a network device;

a processing module 602, configured to determine a random access-radio network temporary identifier RA-RNTI according to at least one of an identifier of a subframe in which the random access preamble is transmitted, an identifier of a frequency domain in which the random access preamble is transmitted, an identifier of an uplink carrier in which the random access preamble is transmitted, a system frame number SFN in which the random access preamble is transmitted, and a value of a period of a physical random access channel opportunity PRACH opportunity in which the random access preamble is transmitted;

Wherein RA-RNTI =1+ t \ u id +10 × f _ id +10 × 2 ^k ul_carrier_id+10×2 ^k X 2 x (SFN _ gradient/y)), wherein t _ id is the identifier of the subframe, f _ id is the identifier of the frequency domain, ul _ carrier _ id is the identifier of the uplink carrier, the periodicity is the value of the period, the gradient function represents an upward rounding operation, mod represents a remainder operation, k is used for representing a subcarrier interval parameter, k is an integer greater than or equal to 0, and y is the duration of a system frame.

Wherein RA-RNTI =1+ t_id +10 × f _ id +80ul _carrier _uid +80 × 2 × (SFN mod (period/y)), wherein t _ id is the identifier of the subframe, f _ id is the identifier of the frequency domain, ul _ carrier _ id is the identifier of the uplink carrier, the period is the value of the period, the period function represents an upward rounding operation, mod represents a remainder operation, and y is the duration of a system frame.

It should be noted that the implementation of each module may also correspond to the corresponding description of the method embodiments shown in fig. 2 and fig. 5, and execute the method and the function executed by the terminal device in the foregoing embodiments.

Referring to fig. 7, fig. 7 is a schematic structural diagram of a network device according to an embodiment of the present application, where the network device may include a receiving module 701, a processing module 702, and a sending module 703, where details of each module are described below.

A receiving module 701, configured to receive a random access preamble sent by a terminal device;

a processing module 702, configured to determine a random access-radio network temporary identifier RA-RNTI according to at least one of an identifier of a first orthogonal frequency division multiplexing OFDM symbol of the random access preamble sent by the terminal device, an identifier of a frequency domain of the random access preamble sent by the terminal device, an identifier of an uplink carrier of the random access preamble sent by the terminal device, and a first identifier, where the first identifier is determined according to at least one of a system frame number SFN of the random access preamble sent by the terminal device, an identifier of a time slot of the random access preamble sent by the terminal device, and a first value, and the first value is a positive integer;

a sending module 703, configured to send a random access response RAR to the terminal device, where the RAR is identified by the RA-RNTI.

Wherein RA-RNTI =1+ s_id +14 × t _ id +14 × 10 × 2 ^k ×f_id+14×10×2 ^k ×8×ul_carrier_id，t_id＝ceiling((SFN×10×2 ^k +slot_id)/x)mod(10×2 ^k ) Wherein the s _ id is the identifier of the first OFDM symbol, and the f _ id is the frequencyThe sign of domain, ul _ carrier _ id does the sign of upstream carrier, t _ id does first sign, slot _ id does the sign of slot, x does first numerical value, ceiling function represents the operation of rounding up, mod represents the operation of seeking remainder, k is used for expressing subcarrier interval parameter, k is the integer more than or equal to 0.

Wherein RA-RNTI =1+ s_id +14 × t _ id +14 × 80 × f _ id +14 × 80 × 8 × ul _ carrier _ id, wherein t _ id = ceiling ((SFN _ id × 80+ slot _id)/x) mod (80), wherein s _ id is an identifier of the first OFDM symbol, f _ id is an identifier of the frequency domain, ul _ carrier _ id is an identifier of the uplink carrier, t _ id is the first identifier, slot _ id is an identifier of the time slot, x is the first numerical value, the ceiling function represents an rounding-up operation, and mod represents a remainder operation.

Wherein, the first value is a value of a period of a physical random access channel opportunity PRACH occasion for sending the random access preamble.

In another embodiment:

a processing module 702, configured to determine a random access-radio network temporary identifier RA-RNTI according to at least one of an identifier of a subframe in which the terminal device sends the random access preamble, an identifier of a frequency domain in which the terminal device sends the random access preamble, an identifier of an uplink carrier in which the terminal device sends the random access preamble, a system frame number SFN in which the terminal device sends the random access preamble, and a value of a period of a physical random access channel opportunity PRACH occasion in which the terminal device sends the random access preamble;

Wherein RA-RNTI =1 t \ u id +10 × f _ id +10 × 2 ^k ul_carrier_id+10×2 ^k X 2 x (SFN modified filing/y)), wherein t _ id isThe identification of sub-frame, f _ id is the identification of frequency domain, ul _ carrier _ id is the identification of uplink carrier, period is the value of cycle, the ceiling function represents the operation of rounding up, mod represents the operation of seeking the remainder, k is used for expressing subcarrier interval parameter, k is the integer that is more than or equal to 0, y is the length of time of system frame.

Wherein RA-RNTI =1+ t _id +10 × f _ id +80ul _ carrier _id +80 × 2 × (SFN mode3 (periodicity/y)), where t _ id is an identifier of the subframe, f _ id is an identifier of the frequency domain, ul _ carrier _ id is an identifier of the uplink carrier, periodicity is a value of the period, the ceiling function represents an upward rounding operation, mod represents a remainder operation, and y is a duration of a system frame.

It should be noted that, the implementation of each module may also correspond to the corresponding description of the method embodiments shown in fig. 2 and fig. 5, and execute the method and the function executed by the network device in the foregoing embodiments.

Please refer to fig. 8, where fig. 8 is a schematic structural diagram of another terminal device according to an embodiment of the present disclosure. As shown in fig. 8, the terminal device may include: at least one processor 801, at least one communication interface 802, at least one memory 803, and at least one communication bus 804.

The processor 801 may be, among other things, a central processing unit, a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, transistor logic, a hardware component, or any combination thereof. Which may implement or perform the various illustrative logical blocks, modules, and circuits described in connection with the disclosure. The processor may also be a combination of computing functions, e.g., comprising one or more microprocessors in combination, a digital signal processor in combination with a microprocessor, and so forth. The communication bus 804 may be a peripheral component interconnect standard PCI bus or an extended industry standard architecture EISA bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 8, but that does not indicate only one bus or one type of bus. A communication bus 804 is used to enable communications among the components. In this embodiment, the communication interface 802 of the device in this application is used for performing signaling or data communication with other node devices. The memory 803 may include a volatile memory, such as a nonvolatile dynamic random access memory (NVRAM), a phase change random access memory (PRAM), a Magnetoresistive Random Access Memory (MRAM), and the like, and may further include a non-volatile memory, such as at least one magnetic disk memory device, an electrically erasable programmable read-only memory (EEPROM), a flash memory device, such as a NOR flash memory or a NAND flash memory, a semiconductor device, such as a Solid State Disk (SSD), and the like. The memory 803 may optionally be at least one memory device located remotely from the processor 801 as previously described. A set of program codes may also optionally be stored in the memory 803 and the processor 801 may also optionally execute the programs executed in the memory 803.

Sending a random access preamble to a network device through communication interface 802;

determining a random access-radio network temporary identifier RA-RNTI according to at least one of an identifier of a first orthogonal frequency division multiplexing OFDM symbol for sending the random access lead code, an identifier of a frequency domain for sending the random access lead code, an identifier of an uplink carrier for sending the random access lead code and a first identifier, wherein the first identifier is determined according to at least one of a system frame number SFN for sending the random access lead code, an identifier of a time slot for sending the random access lead code and a first numerical value, and the first numerical value is a positive integer;

and receiving a Random Access Response (RAR) sent by the network equipment according to the RA-RNTI through a communication interface 802.

Wherein RA-RNTI =1+ s_id +14 × t _ id +14 × 8 × 2 ^k ×f_id+14×8×2 ^k ×8×ul_carrier_id，t_id＝ceiling((SFN×8×2 ^k +slot_id)/x)mod(8×2 ^k ) Wherein, theState s _ id for the sign of first OFDM sign, f _ id is the sign of frequency domain, ul _ carrier _ id is the sign of uplink carrier, t _ id is first sign, slot _ id is the sign of time slot, x is first numerical value, ceiling function represents the operation of rounding up, mod represents the operation of remainder, k is used for representing subcarrier interval parameter, k is the integer that is more than or equal to 0.

In another embodiment:

determining a random access-radio network temporary identifier RA-RNTI according to at least one of an identifier of a subframe for sending the random access preamble, an identifier of a frequency domain for sending the random access preamble, an identifier of an uplink carrier for sending the random access preamble, a system frame number SFN for sending the random access preamble and a value of a period of a physical random access channel opportunity PRACH occasion for sending the random access preamble;

Wherein RA-RNTI =1+ t \ u id +8 × f _ id +8 × 2 ^k ul_carrier_id+8×2 ^k X 2 x (SFN _ periodicity/y)), wherein the t _ id is the subframe identifier, the f _ id is the frequency domain identifier, and the ul_ \carrier _ id is the sign of going up the carrier, period is the value of cycle, ceiling function represents the operation of rounding up, mod represents the operation of seeking a remainder, k is used for representing subcarrier interval parameter, k is the integer that is more than or equal to 0, y is the duration of system frame.

Wherein RA-RNTI =1+ t_id +8 × f _ id +80ul _carrier _uid +80 × 2 × (SFN mod (period/y)), wherein t _ id is the identifier of the subframe, f _ id is the identifier of the frequency domain, ul _ carrier _ id is the identifier of the uplink carrier, the period is the value of the period, the period function represents an upward rounding operation, mod represents a remainder operation, and y is the duration of a system frame.

Further, the processor may cooperate with the memory and the communication interface to perform the operations of the terminal device in the embodiments of the above application.

Referring to fig. 9, fig. 9 is a schematic structural diagram of another network device according to an embodiment of the present disclosure. As shown, the network device may include: at least one processor 901, at least one communication interface 902, at least one memory 903, and at least one communication bus 904.

The processor 901 may be any of the various types of processors mentioned above. The communication bus 904 may be a peripheral component interconnect standard PCI bus or an extended industry standard architecture EISA bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 9, but this does not indicate only one bus or one type of bus. A communication bus 904 is used to enable connective communication between these components. The communication interface 902 of the device in this embodiment is used for performing signaling or data communication with other node devices. The memory 903 may be various types of memories as mentioned earlier. The memory 903 may optionally be at least one storage device located remotely from the processor 901. A set of program codes is stored in the memory 903, and the processor 901 executes the programs executed by the OAM in the memory 903.

Receiving a random access preamble sent by a terminal device through a communication interface 902;

determining a random access-radio network temporary identifier RA-RNTI according to at least one of an identifier of a first Orthogonal Frequency Division Multiplexing (OFDM) symbol of the random access preamble sent by the terminal equipment, an identifier of a frequency domain of the random access preamble sent by the terminal equipment, an identifier of an uplink carrier of the random access preamble sent by the terminal equipment and a first identifier, wherein the first identifier is determined according to at least one of a system frame number SFN of the random access preamble sent by the terminal equipment, an identifier of a time slot of the random access preamble sent by the terminal equipment and a first numerical value, and the first numerical value is a positive integer;

and sending a Random Access Response (RAR) to the terminal equipment through a communication interface 902, wherein the RAR is identified by the RA-RNTI.

Wherein RA-RNTI =1 s_id +14 × t _ id +14 × 10 × 2 ^k ×f_id+14×10×2 ^k ×8×ul_carrier_id，t_id＝ceiling((SFN×10×2 ^k +slot_id)/x)mod(10×2 ^k ) And the s _ id is the identifier of the first OFDM symbol, the f _ id is the identifier of the frequency domain, the ul _ carrier _ id is the identifier of the uplink carrier, the t _ id is the first identifier, the slot _ id is the identifier of the time slot, the x is the first numerical value, the ceiling function represents the rounding operation, the mod represents the remainder operation, the k is used for representing the subcarrier spacing parameter, and the k is an integer greater than or equal to 0.

In another embodiment:

determining a random access-radio network temporary identifier (RA-RNTI) according to at least one of an identifier of a subframe of the random access preamble sent by the terminal equipment, an identifier of a frequency domain of the random access preamble sent by the terminal equipment, an identifier of an uplink carrier of the random access preamble sent by the terminal equipment, a System Frame Number (SFN) of the random access preamble sent by the terminal equipment and a value of a period of a Physical Random Access Channel Opportunity (PRACOCCASI) of the random access preamble sent by the terminal equipment;

Wherein RA-RNTI =1+ t \ u id +10 × f _ id +10 × 2 ^k ul_carrier_id+10×2 ^k X 2 x (SFN _ periodicity/y)), where t _ id is an identifier of the subframe, f _ id is an identifier of the frequency domain, ul _ carrier _ id is an identifier of the uplink carrier, periodicity is a value of the period, the periodicity function represents an upward rounding operation, mod represents a remainder operation, k is used for representing a subcarrier interval parameter, k is an integer greater than or equal to 0, and y is a duration of a system frame.

Further, the processor may cooperate with the memory and the communication interface to perform the operations of the network device in the embodiments of the above application.

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

An embodiment of the present application further provides a communication system, including: the terminal device, and/or the network device.

The above-mentioned embodiments further explain the objects, technical solutions and advantages of the present application in detail. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A random access method, comprising:

the terminal equipment sends a random access lead code to the network equipment;

the terminalThe end equipment determines a random access-radio network temporary identifier RA-RNTI according to at least one of an identifier of a first orthogonal frequency division multiplexing OFDM symbol for sending the random access preamble, an identifier of a frequency domain for sending the random access preamble, an identifier of an uplink carrier for sending the random access preamble and a first identifier, wherein the RA-RNTI =1+ s _ id +14 × t _ id +14 × 10 × 2 ^k × f_id + 14 ×10×2 ^k × 8 × ul_carrier_id，t_id=ceiling((SFN×10×2 ^k + slot_id) /x)mod（10×2 ^k ) Or, the RA-RNTI =1+ s _ id +14 × t _ id +14 × 80 × f _ id +14 × 80 × 8 × ul _ carrier _ id, where t _ id = ceiling ((SFN × 80+ slot _ id)/x) mod (80); the s _ id is an identifier of the first OFDM symbol, the f _ id is an identifier of the frequency domain, the ul _ carrier _ id is an identifier of the uplink carrier, the t _ id is the first identifier, the SFN is a system frame number for sending the random access preamble, the slot _ id is an identifier of a time slot for sending the random access preamble, the x is a first numerical value, the first numerical value is a positive integer, the ceiling function represents an upward rounding operation, the mod represents a remainder operation, the k is used for representing a subcarrier spacing parameter, and the k is an integer greater than or equal to 0;

and the terminal equipment receives a Random Access Response (RAR) sent by the network equipment according to the RA-RNTI.

2. The method of claim 1, wherein the first value is a value of a period of a physical random access channel opportunity (PRACH occase) at which the random access preamble is transmitted.

3. A random access method, comprising:

the network equipment receives a random access lead code sent by the terminal equipment;

the network equipment sends the identifier of the first OFDM symbol of the random access lead code according to the terminal equipment, the identifier of the frequency domain of the random access lead code sent by the terminal equipment, and the terminal equipmentThe end equipment sends at least one of the identifier of the uplink carrier of the random access preamble and the first identifier to determine a random access-radio network temporary identifier RA-RNTI, and the RA-RNTI =1+ s _ id +14 × t _ id +14 × 10 × 2 ^k × f_id + 14 ×10×2 ^k × 8 × ul_carrier_id，t_id=ceiling((SFN×10×2 ^k + slot_id) /x)mod（10×2 ^k ) Or, the RA-RNTI =1+ s _ id +14 × t _ id +14 × 80 × f _ id +14 × 80 × 8 × ul _ carrier _ id, where t _ id = ceiling ((SFN × 80+ slot _ id)/x) mod (80); the s _ id is an identifier of the first OFDM symbol, the f _ id is an identifier of the frequency domain, the ul _ carrier _ id is an identifier of the uplink carrier, the t _ id is the first identifier, the SFN is a system frame number for sending the random access preamble, the slot _ id is an identifier of a slot for sending the random access preamble, the x is a first numerical value, the first numerical value is a positive integer, the ceiling function represents an upward rounding operation, the mod represents a modulo operation, the k is used for representing a subcarrier spacing parameter, and the k is an integer greater than or equal to 0;

and the network equipment sends a Random Access Response (RAR) to the terminal equipment, and the RAR is identified by the RA-RNTI.

4. The method of claim 3, wherein the first value is a value of a period of a physical random access channel opportunity (PRACH occase) at which the random access preamble is transmitted.

5. A terminal device, comprising:

a sending module, configured to send a random access preamble to a network device;

a processing module, configured to determine a random access-radio network temporary identifier RA-RNTI according to at least one of an identifier of a first OFDM symbol used to transmit the random access preamble, an identifier of a frequency domain used to transmit the random access preamble, an identifier of an uplink carrier used to transmit the random access preamble, and a first identifier, where RA-RNTI =1+ s _ id +14 × t _ id + 14 × 10×2 ^k × f_id + 14 ×10×2 ^k × 8 × ul_carrier_id，t_id=ceiling((SFN×10×2 ^k + slot_id) /x)mod（10×2 ^k ) Or, the RA-RNTI =1+ s _ id +14 × t _ id +14 × 80 × f _ id +14 × 80 × 8 × ul _ carrier _ id, where t _ id = ceiling ((SFN × 80+ slot _ id)/x) mod (80); the s _ id is an identifier of the first OFDM symbol, the f _ id is an identifier of the frequency domain, the ul _ carrier _ id is an identifier of the uplink carrier, the t _ id is the first identifier, the SFN is a system frame number for sending the random access preamble, the slot _ id is an identifier of a time slot for sending the random access preamble, the x is a first numerical value, the first numerical value is a positive integer, the ceiling function represents an upward rounding operation, the mod represents a remainder operation, the k is used for representing a subcarrier spacing parameter, and the k is an integer greater than or equal to 0;

and the receiving module is used for receiving a Random Access Response (RAR) sent by the network equipment according to the RA-RNTI.

6. The terminal device of claim 5, wherein the first value is a value of a period of a physical random access channel opportunity, PRACH, occase at which the random access preamble was transmitted.

7. A network device, comprising:

the receiving module is used for receiving a random access lead code sent by the terminal equipment;

a processing module, configured to determine a random access-radio network temporary identifier RA-RNTI according to at least one of an identifier of a first OFDM symbol of the random access preamble sent by the terminal device, an identifier of a frequency domain of the random access preamble sent by the terminal device, an identifier of an uplink carrier of the random access preamble sent by the terminal device, and a first identifier, where RA-RNTI =1+ s _ id +14 × t _ id +14 × 10 × 2 ^k × f_id + 14 ×10×2 ^k × 8 × ul_carrier_id，t_id=ceiling((SFN×10×2 ^k + slot_id) /x)mod（10×2 ^k ) Or, the RA-RNTI =1+ s _ id +14 × t _ id +14 × 80 × f _ id +14 × 80 × 8 × ul _ carrier _ id, where t _ id = ceiling ((SFN × 80+ slot _ id)/x) mod (80); the s _ id is an identifier of the first OFDM symbol, the f _ id is an identifier of the frequency domain, the ul _ carrier _ id is an identifier of the uplink carrier, the t _ id is the first identifier, the SFN is a system frame number for sending the random access preamble, the slot _ id is an identifier of a time slot for sending the random access preamble, the x is a first numerical value, the first numerical value is a positive integer, the ceiling function represents an upward rounding operation, the mod represents a remainder operation, the k is used for representing a subcarrier spacing parameter, and the k is an integer greater than or equal to 0;

and the sending module is used for sending a Random Access Response (RAR) to the terminal equipment, and the RAR is identified by the RA-RNTI.

8. The network device of claim 7, wherein the first value is a value of a period of a physical random access channel opportunity (PRACH occase) at which the random access preamble is transmitted.

9. A terminal device, comprising: a memory for storing program code, a communication bus, and a processor for invoking the program code for performing the method of claim 1 or 2.

10. A network device, comprising: a memory for storing program code, a communication bus, and a processor for invoking the program code for performing the method of claim 3 or 4.

11. A computer-readable storage medium having stored therein instructions that, when executed on a computer, cause the computer to perform the method of any one of claims 1-4.

12. A communication system comprising a network device according to claim 7 or 8 and a terminal device according to claim 5 or 6.