Method, device and system for computing and configuring a random access channel

Abstract

To provide methods, devices, and systems for computing and configuring a random access channel.SOLUTION: The present disclosure relates to methods, systems, and devices for calculating and configuring a random access channel (RACH). One method includes configuring, by a base station, a physical random access channel (PRACH) occasion corresponding to user equipment (UE) by at least one of: configuring, by a base station, a set of parameters; calculating, by the base station, a radio network temporary identifier (RNTI) on the basis of the set of parameters or the PRACH occasion in which a random access preamble is transmitted; and transmitting, by the base station, to the UE, the set of parameters for the PRACH occasion in which a random access preamble is transmitted.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present disclosure relates generally to wireless communications, and more particularly to methods, devices, and systems for calculating and configuring a random access channel (RACH). [Background technology]

[0002] Wireless communication technologies are moving the world towards an increasingly connected and networked society. High-speed and low-latency wireless communication depends on efficient network resource management and allocation between user equipment and radio access network nodes (including, but not limited to, base stations). New generation networks are expected to provide high-speed, low-latency, and ultra-reliable communication capabilities and meet requirements from various industries and users.

[0003] For new generation mobile communication technologies, a base station and / or user equipment needs to configure signal resources for a physical random access channel (PRACH). There are several issues / challenges with existing systems for configuring signal resources for the PRACH. For example, for higher carrier frequencies, the channel bandwidth may be wider than in new radio (NR), new subcarrier spacing may be introduced, and there are challenges / issues with how to calculate a radio network temporary identifier (RNTI).

[0004] The present disclosure describes various embodiments for calculating and configuring random access channel (RACH) opportunities that address at least some of the problems / challenges associated with existing systems to improve wireless communication performance. Summary of the Invention [Means for solving the problem]

[0005] This document relates to methods, systems, and devices for wireless communications, and more particularly to methods, systems, and devices for calculating and configuring a random access channel (RACH).

[0006] In one embodiment, the present disclosure describes a method for wireless communication, the method including configuring, by a base station, a physical random access channel (PRACH) opportunity corresponding to a UE by at least one of: configuring, by the base station, a set of parameters; calculating, by the base station, a radio network temporary identifier (RNTI) based on the set of parameters or a PRACH opportunity on which a random access preamble is transmitted; and transmitting, by the base station, to the UE, the set of parameters for the PRACH opportunity on which the random access preamble is transmitted.

[0007] In another embodiment, the present disclosure describes a method for wireless communication that includes configuring a user equipment (UE) for a physical random access channel (PRACH) opportunity by a base station by at least one of receiving, by the UE, from a base station, a set of parameters for the PRACH opportunity on which a random access preamble is transmitted, and calculating, by the UE, a radio network temporary identifier (RNTI) based on the set of parameters or the PRACH opportunity on which the random access preamble is transmitted.

[0008] In another embodiment, the present disclosure describes a method for wireless communication that includes transmitting a set of parameters for a physical random access channel (PRACH) opportunity from a base station to a user equipment (UE) by independently transmitting at least one of at least one least significant bit (LSB) of a system frame number (SFN) or a segment index from the base station to the UE, the set of parameters including at least one of at least one LSB of the SFN or the segment index.

[0009] In another embodiment, the present disclosure describes a method for wireless communication that includes transmitting a set of parameters for a physical random access channel (PRACH) opportunity from a base station to a user equipment (UE) by independently transmitting at least one least significant bit (LSB) of a system frame number (SFN) and at least one of a segment index from the base station to the UE, the set of parameters including at least one of the at least one LSB of the SFN or the segment index.

[0010] In some other embodiments, an apparatus for wireless communication may include a memory storing instructions and a processing circuit in communication with the memory, the processing circuit being configured, when the instructions are executed, to perform the above-described method.

[0011] In some other embodiments, a device for wireless communication may include a memory storing instructions and a processing circuit in communication with the memory, the processing circuit being configured, when executing the instructions, to perform the above-described method.

[0012] In some other embodiments, a computer-readable medium comprises instructions that, when executed by a computer, cause the computer to perform the above-described method.

[0013] These and other aspects and their implementations are described in more detail in the drawings, specification, and claims. The present invention further provides, for example, the following: (Item 1) 1. A method for wireless communication, the method comprising: configuring, by a base station, a physical random access channel (PRACH) opportunity corresponding to a user equipment (UE); The above-mentioned configuration includes at least configuring, by the base station, a set of parameters; calculating, by the base station, a radio network temporary identifier (RNTI) based on the set of parameters or the PRACH occasion on which a random access preamble is transmitted; transmitting, by the base station, to the UE, the set of parameters for the PRACH opportunity on which a random access preamble is transmitted; A method according to one of the following. (Item 2) 1. A method for wireless communication, the method comprising: configuring, by a base station, a user equipment (UE) for a physical random access channel (PRACH) opportunity; The above-mentioned configuration includes: receiving, by the UE, from a base station, a set of parameters for the PRACH opportunity on which a random access preamble is to be transmitted; calculating, by the UE, a radio network temporary identifier (RNTI) based on the set of parameters or the PRACH occasion on which a random access preamble is transmitted; A method according to at least one of the following: (Item 3) The RNTI is A Random Access RNTI (RA-RNTI) corresponding to a four-step Random Access (RA) process, or MSGB-RNTI for the two-step RA process 3. The method according to any one of items 1 to 2, comprising at least one of: (Item 4) The set of parameters is: an index corresponding to the PRACH opportunity on which the random access preamble is transmitted; At least one least significant bit (LSB) of the system frame number (SFN) or at least one of the segment indexes 4. The method according to any one of items 1 to 3, comprising: (Item 5) a PRACH subcarrier spacing (SCS) corresponding to the PRACH opportunity comprises at least one of 15 kHz, 30 kHz, 60 kHz, 120 kHz, 240 kHz, 480 kHz, or 960*M kHz, where M is a positive integer; 5. The method of claim 4, wherein the particular SCS of the reference slot corresponding to the PRACH opportunity comprises at least one of 15 kHz, 30 kHz, 60 kHz, 120 kHz, 240 kHz, 480 kHz, or 960*P kHz, where P is a positive integer. (Item 6) a particular duration corresponding to the PRACH opportunity, The duration of a single slot for the SCS is 15 kHz, 30 kHz, 60 kHz, 120 kHz, 240 kHz, 480 kHz, or 960*KkHz, where K is a positive integer. System frame, Random Access Response (RAR) window size, or N slots where the SCS is 15 kHz, 30 kHz, 60 kHz, 120 kHz, 240 kHz, 480 kHz, or 960*KkHz, where K is a positive integer and N is a positive integer. Item 5. The method according to item 4, comprising at least one of: (Item 7) Each segment of a particular duration comprises N slots, where N is equal to one of 80*{1, 2, 3, 4, 6, 8, 12, 16}; 5. The method of claim 4, wherein the set of parameters comprises the at least one LSB of the SFN and the segment index. (Item 8) 8. The method of claim 7, wherein the index corresponding to the PRACH opportunity comprises an index of a first slot of a PRACH opportunity in which a random access preamble is transmitted in a segment. (Item 9) 8. The method of claim 7, wherein the index corresponding to the PRACH opportunity comprises a logical RACH opportunity (RO) index within a segment. (Item 10) In response to the PRACH SCS being 120 kHz, the system frame comprises one segment; In response to the PRACH SCS being 240 kHz, the system frame comprises two segments; In response to the PRACH SCS being 480 kHz, the system frame comprises four segments; 10. The method according to any one of items 8 to 9, wherein in response to the PRACH SCS being 960 kHz, the system frame comprises eight segments. (Item 11) The transmission of the set of parameters comprises: the at least one LSB of the SFN and the segment index; the segment index only, or only the at least one LSB of the SFN or 10. The method according to any of items 8 to 9, wherein neither the at least one LSB of the SFN nor the segment index is provided. (Item 12) Each segment refers to a PRACH slot, The segment index indicates a slot index in a slot in which the SCS is 120 KHz, 5. The method of claim 4, wherein the set of parameters comprises the at least one LSB of the SFN and the segment index. (Item 13) The transmission of the set of parameters comprises: Downlink Control Information (DCI), or Random Access Response (RAR) 13. The method according to any one of items 11 to 12, comprising at least one of: (Item 14) 4. The method of any of items 1 to 3, wherein the index corresponding to the PRACH opportunity on which a random access preamble is transmitted comprises a logical RACH opportunity (RO) index in an RA window duration. (Item 15) calculating the RNTI based on the index corresponding to the PRACH opportunity on which the set of parameters or the random access preamble is transmitted includes calculating the RNTI based on 14*t; 15. The method of any of items 7 to 14, wherein t is the index corresponding to the PRACH opportunity. (Item 16) The index corresponding to the PRACH opportunity is: a logical index of the PRACH opportunity for a particular duration; the index of the first slot of said PRACH opportunity in a system frame; or the index of the first slot of the PRACH opportunity in the special duration Item 5. The method according to item 4, comprising at least one of: (Item 17) The particular duration corresponding to the PRACH opportunity may be: The duration of the RA window, or N* system frames, where N is a positive integer. Item 17. The method of item 16, comprising at least one of: (Item 18) calculating the RNTI based on the index corresponding to the PRACH opportunity on which the set of parameters or the random access preamble is transmitted includes calculating the RNTI based on 14*mod(t,80); Item 17. The method of item 16, wherein t is the index corresponding to the PRACH opportunity and mod is a modulo operation. (Item 19) in response to the index corresponding to the PRACH opportunity comprising the logical index of the PRACH opportunity in the particular duration; In response to the PRACH opportunity on which a random access preamble is transmitted, the following parameters: the segment index, or the at least one LSB of the SFN 17. The method of claim 16, wherein at least one of the following is transmitted from the base station to the UE: (Item 20) In response to the index corresponding to the PRACH opportunity comprising the index of the first slot of the PRACH opportunity in the system frame, the segment index is excluded from being transmitted from the base station to the UE; In response to the index corresponding to the PRACH opportunity comprising the index of the first slot of the PRACH opportunity in the special duration, the following parameters: the segment index, or the at least one LSB of the SFN 17. The method of claim 16, wherein at least one of the following is transmitted from the base station to the UE: (Item 21) 1. A method for wireless communication, the method comprising transmitting a set of parameters for a Physical Random Access Channel (PRACH) opportunity from a base station to a user equipment (UE); the set of parameters comprises at least one of at least one least significant bit (LSB) of a system frame number (SFN) or at least one of a segment index; The transmitting step includes: The method, wherein at least one of the at least one LSB of the SFN or the segment index is transmitted independently from the base station to the UE. (Item 22) In response to an RA window being greater than 10 milliseconds, the at least one LSB of the SFN comprises N bits, where N is 2 bits, or a zero bit in response to the RA window being less than or equal to 10 milliseconds, a one bit in response to the RA window being 20 milliseconds, and two bits in response to the RA window being greater than 20 milliseconds; 22. The method according to item 21, wherein the method is at least one of the following: (Item 23) The segment index is 3 bits, or a zero bit in response to a PRACH SCS being 120 kHz or less, a one bit in response to the PRACH SCS being 240 kHz, two bits in response to the PRACH SCS being 480 kHz, and three bits in response to the PRACH SCS being 960 kHz. 22. The method of claim 21, comprising at least one of: (Item 24) the segment index comprises N bits; 22. The method of claim 21, wherein N=log2(M / 120), where M is the PRACH SCS in kHz. (Item 25) transmitting the set of parameters from the base station to the UE for the PRACH opportunity, transmitting the at least one least significant bit (LSB) of the SFN from the base station to the UE in response to an RA window greater than 10 milliseconds and a PRACH SCS less than or equal to 120 kHz; transmitting the at least one LSB of the SFN and the segment index from the base station to the UE in response to the RA window being greater than 10 milliseconds and the PRACH SCS being greater than 120 kHz; transmitting the at least one LSB of the SFN from the base station to the UE in response to the RA window being greater than 10 milliseconds and the PRACH SCS being greater than 120 kHz; in response to the RA window being equal to or less than 10 milliseconds and the PRACH SCS being equal to or less than 120 kHz, not transmitting from the base station to the UE either the at least one LSB of the SFN or the segment index; transmitting the segment index from the base station to the UE in response to the RA window being less than or equal to 10 milliseconds and the PRACH SCS being greater than 120 kHz; in response to the RA window being less than or equal to 10 milliseconds and the PRACH SCS being greater than 120 kHz, not transmitting from the base station to the UE either the at least one LSB of the SFN or the segment index; transmitting from the base station in response to the RA window and the PRACH SCS at least one LSB of the SFN and the segment index; transmitting the at least one LSB of the SFN from the base station to the UE in response to the RA window and the PRACH SCS; In response to the RA window and the PRACH SCS, neither the at least one LSB of the SFN nor the segment index is transmitted from the base station to the UE; or transmitting the segment index from the base station to the UE in response to the RA window and the PRACH SCS. Item 5. The method according to item 4, comprising at least one of the following: (Item 26) 26. The method of claim 25, wherein the at least one LSB of the SFN and the segment index comprise N bits, where N is one of 2, 3, 4, or 5 based on the RA window and the PRACH SCS. (Item 27) 26. The method of claim 25, wherein the at least one LSB of the SFN and the segment index comprise 5 bits. (Item 28) 28. A wireless communication device comprising a processor and a memory, the processor configured to read code from the memory and implement a method according to any one of items 1 to 27. (Item 29) 28. A computer program product comprising computer-readable program medium code stored thereon, the computer-readable program medium code, when executed by a processor, causing the processor to implement the method of any of items 1 to 27. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 illustrates an example of a wireless communication system including one radio network node and one or more user equipments.

[0015] [Figure 2] FIG. 2 shows an example of a network node.

[0016] [Figure 3] FIG. 3 shows an example of a user equipment.

[0017] [Figure 4] FIG. 4 illustrates a flow diagram of a method for wireless communication.

[0018] [Figure 5] FIG. 5 illustrates a flow diagram of a method for wireless communication.

[0019] [Figure 6A] FIG. 6A shows a schematic diagram of a method for wireless communication.

[0020] [Figure 6B] FIG. 6B shows a schematic diagram of a method for wireless communication.

[0021] [Figure 7] FIG. 7 shows a schematic diagram of a method for wireless communication.

[0022] [Figure 8] FIG. 8 shows a schematic diagram of a method for wireless communication.

[0023] [Figure 9] FIG. 9 illustrates a flow diagram of a method for wireless communication.

[0024] [Figure 10] FIG. 10 shows a schematic diagram of a method for wireless communication.

[0025] [Figure 11] FIG. 11 shows a schematic diagram of a method for wireless communication. DETAILED DESCRIPTION OF THE INVENTION

[0026] The present disclosure will now be described in detail with reference to the accompanying drawings, which form a part hereof, and which show, by way of illustration, specific embodiments. It should be noted, however, that the present disclosure may be embodied in a variety of different forms, and therefore, the subject matter embraced or claimed should not be construed as limited to any of the embodiments set forth below.

[0027] Throughout this specification and claims, terms may have nuanced meanings suggested or implied in context beyond their explicitly stated meaning. Similarly, the phrases "in one embodiment" or "in some embodiments" used herein do not necessarily refer to the same embodiment, and the phrases "in another embodiment" or "in other embodiments" used herein do not necessarily refer to different embodiments. The phrases "in one implementation" or "in some implementations" used herein do not necessarily refer to the same implementation, and the phrases "in another implementation" or "in other implementations" used herein do not necessarily refer to different implementations. For example, the claimed subject matter is intended to include, in whole or in part, combinations of example embodiments or implementations.

[0028] Generally, terms may be understood, at least in part, from their use in context. For example, terms such as "and," "or," or "and / or" as used herein may include a variety of meanings that may depend, at least in part, on the context in which such terms are used. Typically, "or," when used to relate a list such as A, B, or C, is intended to mean A, B, and C, which are used here in an inclusive sense, and A, B, or C, which are used here in an exclusive sense. Furthermore, the terms "one or more" or "at least one" as used herein may be used to describe any feature, structure, or characteristic in a singular sense, or may be used to describe a combination of features, structures, or characteristics in a plural sense, depending, at least in part, on the context. Similarly, terms such as "a," "an," or "the" may be understood to convey singular usage or to convey plural usage, depending, at least in part, on the context. Furthermore, the terms "based on" or "determined by" may be understood not to necessarily convey an exclusive set of factors, but instead may allow for the existence of additional factors not necessarily explicitly described, depending, at least in part, on the context.

[0029] The present disclosure describes methods and devices for calculating and configuring a random access channel (RACH).

[0030] New generation (NG) mobile communication systems are moving the world towards an increasingly connected and networked society. High-speed and low-latency wireless communications depend on efficient network resource management and allocation between user equipment and radio access network nodes (including, but not limited to, radio base stations). New generation networks are expected to provide high-speed, low-latency, and ultra-reliable communication capabilities and meet requirements from various industries and users.

[0031] This disclosure describes various embodiments for transmitting initial access information to user equipment. FIG. 1 shows a wireless communication system 100 including a radio network node 118 and one or more user equipments (UEs) 110. The radio network node may include a network base station, which may be a Node B (NB, e.g., gNB) in a mobile communication context. Each of the UEs may wirelessly communicate with the radio network node via one or more radio channels 115. For example, a first UE 110 may wirelessly communicate with the radio network node 118 over a channel including multiple radio channels for a certain period of time. The network base station 118 may configure PRACH transmission parameters to the UE 110. The UE 110 may receive Physical Random Access Channel (PRACH) transmission parameters (e.g., but not limited to, a PRACH preamble format, time resources, and frequency resources for PRACH transmission).

[0032] For fifth-generation mobile communication technologies, a base station and / or user equipment needs to configure signal resources for a physical random access channel (PRACH). There are several problems / challenges associated with existing systems for configuring signal resources for the PRACH. For example, some problems / challenges are associated with new subcarrier spacings (SCSs) for wider channel bandwidths at higher carrier frequencies. Another problem / challenge is how to calculate a radio network temporary identifier (RNTI) for the new subcarrier spacings introduced. The present disclosure may address at least some of the problems / challenges associated with existing systems to improve wireless communication performance.

[0033] In various embodiments, the maximum number of slot numbers in a radio frame or system frame may be relatively large. For example, if the SCS is equal to 960 kilohertz (KHz or kHz), this number is 640. The function for calculating the Radio Network Temporary Identifier (RNTI) may need to be modified.

[0034] In some embodiments, the RNTI may include a Random Access Radio Network Temporary Identifier (RA-RNTI). The function for calculating the RA-RNTI may be RA-RNTI=1+s_id+14×t_id+14×80×f_id+14×80×8×ul_carrier_id, where s_id is the index of the first OFDM symbol of the PRACH opportunity (0≦s_id<14), and t_id is the index of the first slot of the PRACH opportunity in the system frame (0≦t_id<80), and is determined by the value of μ (associated with the SCS).

[0035] For t_id numbers greater than 80 when the PRACH subcarrier spacing (SCS) is greater than 120 KHz, the present disclosure describes several embodiments for designing the RA-RNTI value to ensure that the RA-RNTI value does not exceed the maximum value.

[0036] In some embodiments, the RNTI may include a msg-B Radio Network Temporary Identifier (MSGB-RNTI), which is associated with the PRACH opportunity on which the random access preamble is transmitted. MSGB-RNTI may be calculated as MSGB-RNTI=1+s_id+14×t_id+14×80×f_id+14×80×8×ul_carrier_id+14×80×8×2. where s_id is the index of the first OFDM symbol of the PRACH opportunity (0≦s_id<14), t_id is the index of the first slot of the PRACH opportunity in the system frame (0≦t_id<80), where the subcarrier spacing for determining t_id is based on the specified value of μ, f_id is the index of the PRACH opportunity in the frequency domain (0≦f_id<8), and ul_carrier_id is the UL carrier used for random access preamble transmission (0 for NUL carrier, 1 for SUL carrier).

[0037] In some embodiments for 5G NR, when the RA window is >10 ms for 4-step and 2-step RACH, downlink control information (DCI) 1_0 may include 0 or at least one significant bit (LSB) of the system frame number (SFN). When the msgB-responseWindow is configured to be greater than 10 milliseconds (ms), the LSB of the SFN may include 2 bits for DCI format 1_0 with a cyclic redundancy check (CRC) scrambled by the MsgB-RNTI. When the ra-ResponseWindow or ra-ResponseWindow-v1610 is configured to be greater than 10 ms, the LSB of the SFN may include 2 bits for DCI format 1_0 with a CRC scrambled by the RA-RNTI for operation in cells with shared spectrum channel access. In other situations, for example, when the msgB-responseWindow is configured to be less than or equal to 10 ms, the LSB of the SFN may include a 0 bit.

[0038] In some embodiments, a new PRACH subcarrier spacing may be introduced and therefore the functions for calculating the RA-RNTI and / or MSGB-RNTI may need to be changed and new rules for the calculation may be created accordingly.

[0039] 2 shows an example of an electronic device 200 for implementing a network base station. The exemplary electronic device 200 may include radio transmit / receive (Tx / Rx) circuitry 208 for transmitting / receiving communications with UEs and / or other base stations. The electronic device 200 may also include network interface circuitry 209 for allowing the base station to communicate with other base stations and / or a core network (e.g., optical or wired interconnects, Ethernet, and / or other data transmission media / protocols). The electronic device 200 may include an input / output (I / O) interface 206 for communicating with an operator, etc., as needed.

[0040] The electronic device 200 may also include system circuitry 204. The system circuitry 204 may include a processor 221 and / or memory 222. The memory 222 may include an operating system 224, instructions 226, and parameters 228. The instructions 226 may configure one or more of the processors 221 to perform the functions of a network node. The parameters 228 may include parameters to support the execution of the instructions 226. For example, the parameters may include network protocol settings, bandwidth parameters, radio frequency mapping assignments, and / or other parameters.

[0041] FIG. 3 illustrates an example of an electronic device for implementing a terminal device 300 (e.g., user equipment (UE)). The UE 300 may be a mobile device, such as a smartphone or a mobile communication module located in a vehicle. The UE 300 may include a communication interface 302, a system circuit 304, an input / output interface (I / O) 306, a display circuit 308, and a memory device 309. The display circuit may include a user interface 310. The system circuit 304 may include any combination of hardware, software, firmware, or other logic / circuitry. The system circuit 304 may be implemented, for example, by one or more system-on-chip (SoC), application-specific integrated circuits (ASIC), discrete analog and digital circuits, and other circuits. The system circuit 304 may be part of the implementation of any desired functionality in the UE 300. In that regard, the system circuitry 304 may include logic facilitating music and video decoding and playback, such as MP3, MP4, MPEG, AVI, FLAC, AC3, or WAV decoding and playback; executing applications; accepting user input; storing and retrieving application data; establishing, maintaining, and terminating data connections, such as for a cellular phone call or an Internet connection, for example; establishing, maintaining, and terminating a wireless network connection, a Bluetooth® connection, or other connection; and displaying related information on the user interface 310. The user interface 310 and input / output (I / O) interface 306 may include a graphical user interface, a touch-sensitive display, haptic feedback or other tactile output, voice or facial recognition input, buttons, switches, speakers, and other user interface elements. Further examples of the I / O interface 306 may include a microphone, a video and still image camera, a temperature sensor, a vibration sensor, a rotation and orientation sensor, a headset and microphone input / output jack, a universal serial bus (USB) connector, a memory card slot, a radiation sensor (e.g., an IR sensor), and other types of inputs.

[0042] 3, the communications interface 302 may include radio frequency (RF) transmit (Tx) and receive (Rx) circuitry 316 that handles the transmission and reception of signals via one or more antennas 314. The communications interface 302 may include one or more transceivers. The transceiver may be a wireless transceiver including modulation / demodulation circuitry, digital-to-analog converters (DACs), shaping tables, analog-to-digital converters (ADCs), filters, waveform shapers, filters, preamplifiers, power amplifiers, and / or other logic for transmitting and receiving via one or more antennas or (for some devices) via a physical (e.g., wired) medium. The transmitted and received signals may conform to any of a diverse array of formats, protocols, modulations (e.g., QPSK, 16-QAM, 64-QAM, or 256-QAM), frequency channels, bit rates, and coding. As one specific example, communication interface 302 may include a transceiver supporting transmission and reception under 2G, 3G, BT, WiFi, Universal Mobile Telecommunications System (UMTS), High Speed ​​Packet Access (HSPA)+, 4G / Long Term Evolution (LTE), and 5G standards. However, the techniques described below are applicable to other wireless communication technologies, whether arising from the 3rd Generation Partnership Project (3GPP), GSM Association, 3GPP2, IEEE, or other partnerships or standards bodies.

[0043] 3 , the system circuitry 304 may include one or more processors 321 and memory 322. The memory 322 stores, for example, an operating system 324, instructions 326, and parameters 328. The processor 321 is configured to execute the instructions 326 to perform desired functions for the UE 300. The parameters 328 may provide and specify configuration and operational options for the instructions 326. The memory 322 may also store any BT, WiFi, 3G, 4G, 5G, or other data that the UE 300 transmits or receives via the communication interface 302. In various implementations, system power for the UE 300 may be supplied by a power storage device, such as a battery or a transformer.

[0044] The present disclosure describes several embodiments below that may be implemented in part or in whole on the network base stations and / or user equipment described above in FIGS.

[0045] 4, the present disclosure describes an embodiment of a method 400 for configuring, by a base station, a physical random access channel (PRACH) opportunity corresponding to a user equipment (UE). Method 400 may include at least one of the following steps: step 410, configuring, by the base station, a set of parameters; step 420, calculating, by the base station, a radio network temporary identifier (RNTI) based on the set of parameters or the PRACH opportunity on which the random access preamble is to be transmitted; and step 430, transmitting, by the base station, the set of parameters for the PRACH opportunity on which the random access preamble is to be transmitted to the UE.

[0046] 5, the present disclosure describes an embodiment of a method 500 for configuring a user equipment (UE) for a physical random access channel (PRACH) opportunity by a base station. The method 500 includes at least one of the following steps: step 510, receiving, by the UE, from the base station, a set of parameters for the PRACH opportunity on which a random access preamble is to be transmitted; step 520, calculating, by the UE, a radio network temporary identifier (RNTI) based on the set of parameters or the PRACH opportunity on which the random access preamble is to be transmitted.

[0047] In one implementation, the RNTI includes at least one of a random access RNTI (RA-RNTI) corresponding to a four-step random access (RA) process or an MSGB-RNTI corresponding to a two-step RA process.

[0048] In another implementation, the set of parameters includes an index corresponding to the PRACH opportunity on which the random access preamble is transmitted and at least one of at least one least significant bit (LSB) of a system frame number (SFN) or a segment index.

[0049] In another implementation, a PRACH subcarrier spacing (SCS) corresponding to a PRACH opportunity includes at least one of 15 kHz, 30 kHz, 60 kHz, 120 kHz, 240 kHz, 480 kHz, or 960*M kHz, where M is a positive integer. A particular SCS of a reference slot corresponding to a PRACH opportunity includes at least one of 15 kHz, 30 kHz, 60 kHz, 120 kHz, 240 kHz, 480 kHz, or 960*P kHz, where P is a positive integer.

[0050] In another implementation, the specific duration corresponding to the PRACH opportunity includes at least one of the following: a duration of a single slot with an SCS of 15 kHz, 30 kHz, 60 kHz, 120 kHz, 240 kHz, 480 kHz, or 960*KkHz (where K is a positive integer); a system frame; a random access response (RAR) window size; or N slots with an SCS of 15 kHz, 30 kHz, 60 kHz, 120 kHz, 240 kHz, 480 kHz, or 960*KkHz (where K is a positive integer and N is a positive integer).

[0051] In various embodiments, each segment of a particular duration includes N slots, where N is equal to one of 80*{1, 2, 3, 4, 6, 8, 12, 16}; the set of parameters includes at least one LSB of the SFN and a segment index.

[0052] In one implementation, the index corresponding to the PRACH opportunity includes the index of the first slot of the PRACH opportunity in which the random access preamble is transmitted within the segment.

[0053] In another implementation, the index corresponding to the PRACH opportunity includes a logical RACH opportunity (RO) index within the segment.

[0054] In another implementation, in response to the PRACH SCS being 120 kHz, the system frame includes one segment; in response to the PRACH SCS being 240 kHz, the system frame includes two segments; in response to the PRACH SCS being 480 kHz, the system frame includes four segments; In response to the SCS being 960 kHz, the system frame includes eight segments.

[0055] In another implementation, the transmission of the set of parameters includes at least one of the following: at least one LSB of the SFN and a segment index; only a segment index; only at least one LSB of the SFN; or neither at least one LSB of the SFN nor a segment index.

[0056] In another implementation, each segment refers to a PRACH slot, the segment index indicates a slot index within the slot where the SCS is 120 kHz, and the set of parameters includes at least one LSB of the SFN and the segment index.

[0057] In another implementation, the transmission of the set of parameters includes at least one of the following: Downlink Control Information (DCI); or Random Access Response (RAR).

[0058] In another implementation, the RNTI within a segment, eg, RA-RNTI or MSGB-RNTI, may be calculated based on t_id, which is the index of the PRACH opportunity in the time period (ie, segment).

[0059] In another implementation, a segment index in the signaling information may be introduced, for example, if the PRACH SCS is 240 kHz, there are two segments in the radio frame (or system frame), if the PRACH SCS is 480 kHz, there are four segments in the radio frame, and if the PRACH SCS is 960 kHz, there are eight segments in the radio frame.

[0060] As shown in FIG. 6A, four segments are included within a particular duration, which may refer to a radio frame for a particular PRACH SCS, for example, if the PRACH SCS is 480 Khz.

[0061] As shown in FIG. 6B, eight segments are included within a particular duration, which may refer to a radio frame for a particular PRACH SCS, for example, if the PRACH SCS is 960 khz.

[0062] Each segment may contain N slots, where N is typically one of 80*{1, 2, 3, 4, 6, 8, 12, 16}.

[0063] In another implementation, the LSB of the SFN and the segment index may be signaled by control information, for example, DCI or RAR.

[0064] In various embodiments, the RNTI within a segment may be calculated, and the t_id index may be a logical RO index within a time period (ie, a segment).

[0065] FIG. 7 shows an example of a segment referencing a PRACH slot, where the segment index refers to the slot index within the slot for the PRACH SCS, which is 120 KHz.

[0066] In various embodiments, the index corresponding to the PRACH opportunity on which the random access preamble is transmitted comprises a logical RACH opportunity (RO) index in the RA window duration.

[0067] In one implementation, the step of calculating the RNTI based on an index corresponding to the PRACH opportunity on which the set of parameters or the random access preamble is transmitted may include calculating the RNTI based on 14*t, where t is the index corresponding to the PRACH opportunity.

[0068] In one or more embodiments, the RNTI at the RA window size may be calculated, and the t_id index may be a logical RO index at the time period (ie, the RA window duration).

[0069] In one implementation, the calculation of RA-RNTI may be RA-RNTI=1+s_id+14×t_id+14×80×f_id+14×80×8×ul_carrier_id, where s_id is the index of the first OFDM symbol of the PRACH opportunity (0≦s_id<14) and t_id is the logical index of the PRACH opportunity in the RA window size.

[0070] In another implementation, the calculation of MSGB-RNTI may be MSGB-RNTI=1+s_id+14×t_id+14×80×f_id+14×80×8×ul_carrier_id+14×80×8×2, where s_id is the index of the first OFDM symbol of the PRACH opportunity (0≦s_id<14) and t_id is the index of the logical index of the PRACH opportunity.

[0071] In another implementation, no additional parameters need to be signaled from the base station to the UE.

[0072] 8 shows an example of logical indices for PRACH opportunities, which may include any one or all of 0, 1, 2, 3, 4, 5, 6, and 7. In other implementations, the logical indices for PRACH opportunities may include any integer from 0 to 79.

[0073] In various embodiments, the index corresponding to the PRACH opportunity includes at least one of the following: a logical index of the PRACH opportunity in a special duration; an index of the first slot of the PRACH opportunity in a system frame; or an index of the first slot of the PRACH opportunity in a special duration.

[0074] In one implementation, the particular duration corresponding to the PRACH opportunity comprises at least one of the duration of the RA window or N*system frames, where N is a positive integer.

[0075] In another implementation, calculating the RNTI based on an index corresponding to a PRACH opportunity on which the set of parameters or random access preamble is transmitted may include calculating the RNTI based on 14*mod(t,80), where t is an index corresponding to the PRACH opportunity and mod is a modulo operation.

[0076] In another implementation, in response to an index corresponding to a PRACH opportunity, which includes a logical index of a PRACH opportunity in a particular duration; in response to a PRACH opportunity on which a random access preamble is transmitted, at least one of the following parameters is transmitted from the base station to the UE: a segment index, or at least one LSB of the SFN.

[0077] In another implementation, in response to an index corresponding to a PRACH opportunity that includes an index of the first slot of the PRACH opportunity in the system frame, the segment index is excluded from being transmitted from the base station to the UE, and in response to an index corresponding to a PRACH opportunity that includes an index of the first slot of the PRACH opportunity in a special duration, at least one of the following parameters is transmitted from the base station to the UE: the segment index or at least one LSB of the SFN.

[0078] In various embodiments, an RNTI at a special duration may be calculated, and the RNTI may include at least one of an RA-RNTI and / or an MSGB-RNTI.

[0079] In one implementation, t_id is a logical index of a PRACH opportunity in a particular duration.

[0080] In another implementation, t_id is the index of the first slot of the PRACH opportunity in the system frame.

[0081] In another implementation, t_id is the index of the first slot of the PRACH opportunity in a particular duration.

[0082] In another implementation, the calculation of RA-RNTI may be RA-RNTI=1+s_id+14×mod(t_id,80)+14×80×f_id+14×80×8×ul_carrier_id.

[0083] In another implementation, the calculation of MSGB-RNTI may be MSGB-RNTI=1+s_id+14×mod(t_id,80)+14×80×f_id+14×80×8×ul_carrier_id+14×80×8×2.

[0084] In another implementation, there may be only one segment enabled or configured within a particular duration, for example, but not limited to, a slot duration for an SCS equal to 120 kHz, a radio frame, a slot duration for an SCS that is one of 120 Khz, 240 Khz, 480 KHz, or 960 Khz.

[0085] In one implementation, different references to t_id may correspond to different information signaling.

[0086] In another implementation, for a particular duration, the information signaling may indicate the segment and the LSB.

[0087] In another implementation, for a system frame, the information signaling may indicate the LSB, but need not indicate the segment.

[0088] 9, the present disclosure describes an embodiment of a method 900 for transmitting a set of parameters from a base station to a user equipment (UE) for a physical random access channel (PRACH) opportunity. In one implementation, the set of parameters includes at least one of at least one least significant bit (LSB) of a system frame number (SFN) or a segment index. The method 900 may include a step 910 of independently transmitting the at least one of the at least one LSB of the SFN or the segment index from the base station to the UE.

[0089] In one implementation, in response to the RA window being greater than 10 milliseconds, at least one LSB of the SFN includes N bits, where N is at least one of the following: 2 bits; or, a zero bit in response to the RA window being less than or equal to 10 milliseconds, a 1 bit in response to the RA window being 20 milliseconds, and a 2 bits in response to the RA window being greater than 20 milliseconds.

[0090] In another implementation, the segment index includes at least one of the following: 3 bits; or a zero bit in response to the PRACH SCS being less than or equal to 120 kHz, 1 bit in response to the PRACH SCS being 240 kHz, 2 bits in response to the PRACH SCS being 480 kHz, and 3 bits in response to the PRACH SCS being 960 kHz.

[0091] In another implementation, the segment index contains N bits, where N=log2(M / 120), and M is the PRACH SCS in kHz.

[0092] This disclosure describes various embodiments for signaling information from a base station to a UE.

[0093] In one implementation, the base station may independently notify the UE of the LSB of the SFN and the segment index.

[0094] In another implementation, the base station may signal the LSB of the SFN to the UE if the RA window is >10 ms: 1 bit corresponding to a 20 ms RA window; and 2 bits corresponding to a 30 ms or 40 ms RA window.

[0095] In another implementation, the base station may signal two bits to the UE for all cases.

[0096] In another implementation, the base station may signal a segment index: 0 bit corresponding to PRACH SCS<=120 KHz; 1 bit corresponding to PRACH SCS=240 KHz; 2 bits corresponding to PRACH SCS=480 KHz; 3 bits corresponding to PRACH SCS=960 KHz. In another implementation, the base station may signal 3 bits for all cases.

[0097] In various embodiments, transmitting a set of parameters from the base station to the UE for the PRACH opportunity may include at least one of the following: transmitting at least one LSB of the SFN from the base station to the UE in response to the RA window being greater than 10 ms and the PRACH SCS being less than or equal to 120 kHz; transmitting at least one LSB of the SFN and a segment index from the base station to the UE in response to the RA window being greater than 10 ms and the PRACH SCS being greater than 120 kHz; transmitting at least one LSB of the SFN from the base station to the UE in response to the RA window being greater than 10 ms and the PRACH SCS being greater than 120 kHz; not transmitting at least one LSB of the SFN or a segment index from the base station to the UE in response to the RA window being less than or equal to 10 ms and the PRACH SCS being less than or equal to 120 kHz; transmitting a segment index from the base station to the UE in response to the RA window being less than or equal to 10 ms and the PRACH SCS being greater than 120 kHz; transmitting at least one LSB of the SFN and a segment index from the base station to the UE in response to the SCS being greater than 120 kHz; and transmitting at least one LSB of the SFN and a segment index from the base station in response to the RA window and the PRACH SCS; transmitting at least one LSB of the SFN from the base station to the UE in response to the RA window and the PRACH SCS; transmitting at least one LSB of the SFN and a segment index from the base station to the UE in response to the RA window and the PRACH SCS; transmitting at least one LSB of the SFN and a segment index from the base station to the UE in response to the RA window and the PRACH SCS; and transmitting a segment index from the base station to the UE in response to the RA window and the PRACH SCS.

[0098] In one implementation, at least one LSB of the SFN and segment index includes N bits, where N is one of 2, 3, 4, or 5 based on the RA window and the PRACH SCS.

[0099] This disclosure describes one or more examples of various embodiments for independently signaling the LSB and segment index of an SFN from a base station to a UE.

[0100] In case 1, if RA window > 10 ms and PRACH SCS <= 120 KHz, only the LSB of the SFN is reported.

[0101] In case 2, if RA window > 10 ms and PRACH SCS > 120 KHz, both the LSB of the SFN and the segment index are signaled.

[0102] In case 3, if RA window <= 10 ms and PRACH SCS <= 120 KHz, nothing is reported.

[0103] In case 4, if RA window <= 10 ms and PRACH SCS > 120 KHz, only the segment index is signaled.

[0104] In one implementation, 5 bits are signaled by the base station for all cases. In another implementation, N bits are signaled by the base station for all cases, where N can be any integer from 0 to 5, and N can be a value shown in Table 1, where " / " refers to "or" in Table 1. [Table 1]

[0105] In another implementation, the index orders in Table 1 may be combined in any order.

[0106] For an example shown in Figure 10, if RA window = 20 ms and PRACH SCS = 960 Khz, the special duration may refer to 20 ms and include 16 segments. Each segment may include 80 slots. The index of each segment is shown in Figure 10. 4 bits may be required to indicate the segment index. In this case, which corresponds to Table 1 where "index" is equal to 7, "RA window" is equal to 20 ms, "PRACH SCS" is equal to 960 Khz, and "number of bits" is equal to 4 bits.

[0107] For the first segment, the four bits may be "0000".

[0108] For the second segment, the four bits can be "0001" etc.

[0109] For the 16th segment, the 4 bits may be "1111".

[0110] In various embodiments, at least one LSB of the SFN and the segment index may include 5 bits.

[0111] In one implementation, the base station may rely on the UE to notify the LSB of the SFN and segment index.

[0112] In another implementation, 5 bits are signaled by the base station for all cases. In another implementation, N bits are signaled by the base station for all cases, where N can be any integer from 0 to 5, and N can be a value shown in Table 1.

[0113] For another example as shown in Figure 11, if RA window = 40 ms and PRACH slot = 960 Khz, the special duration refers to 40 ms and may include 32 segments in 40 ms. Each segment may include 80 slots. The segment index is shown in Figure 11. Five bits may be required to indicate the segment index. In this case, which corresponds to Table 1 where "index" is 15, "RA window" is equal to 40 ms, "PRACH SCS" is equal to 960 Khz, and "number of bits" is equal to 5 bits.

[0114] For the first segment, the 5 bits may be "00000".

[0115] For the second segment, the 5 bits may be "00001", etc.

[0116] For the 16th segment, the 5 bits may be "01111", etc.

[0117] For the 32nd segment, the 5 bits may be "11111".

[0118] The present disclosure describes a method, an apparatus, and a computer-readable medium for wireless communication. The present disclosure addresses problems related to calculating and configuring a random access channel (RACH). The method, the device, and the computer-readable medium described in the present disclosure may facilitate the performance of wireless transmissions between user equipment and a base station, thus improving efficiency and overall performance. The method, the device, and the computer-readable medium described in the present disclosure may improve the overall efficiency of a wireless communication system.

[0119] References to features, advantages, or similar language throughout this specification do not imply that all of the features and advantages that may be realized by the solution should or are included in any single implementation thereof. Rather, language referring to features and advantages is understood to mean that the particular feature, advantage, or characteristic described in connection with an embodiment is included in at least one embodiment of the solution. Thus, descriptions of features and advantages, and similar language throughout this specification, may, but do not necessarily, refer to the same embodiment.

[0120] Furthermore, the described features, advantages, and characteristics of the solution may be combined in any suitable manner in one or more embodiments. Those skilled in the art will recognize, in light of the description herein, that the solution may be practiced without one or more of the specific features or advantages of a particular embodiment. In other instances, additional features and advantages may be recognized in certain embodiments that may not be present in all embodiments of the solution.

Claims

1. 1. A method for wireless communication, the method being performed by a base station, comprising: The method comprises: configuring a physical random access channel (PRACH) opportunity corresponding to a user equipment (UE) by configuring one or more parameters; determining a radio network temporary identifier (RNTI) based on the PRACH opportunity on which a random access preamble is transmitted; Including, Determining the RNTI based on the PRACH opportunity on which the random access preamble is transmitted Determining a parameter t_id corresponding to the PRACH opportunity whose PRACH SCS includes 480 kHz or 960 kHz according to a slot index of a reference slot whose specific subcarrier spacing (SCS) is 120 kHz in a system frame; determining the RNTI based on the parameter t_id; A method comprising:

2. 1. A method for wireless communication, the method being performed by a user equipment (UE), comprising: The method comprises: receiving, from a base station, one or more parameters for a physical random access channel (PRACH) opportunity on which a random access preamble is to be transmitted; determining a radio network temporary identifier (RNTI) based on the PRACH opportunity on which a random access preamble is transmitted; Including, Determining the RNTI based on the PRACH opportunity on which the random access preamble is transmitted Determining a parameter t_id corresponding to the PRACH opportunity whose PRACH SCS includes 480 kHz or 960 kHz according to a slot index of a reference slot whose specific subcarrier spacing (SCS) is 120 kHz in a system frame; determining the RNTI based on the parameter t_id; A method comprising:

3. The RNTI is a Random Access RNTI (RA-RNTI) corresponding to a four-step Random Access (RA) process, or msg-B Radio Network Temporary Identifier (MSGB-RNTI) corresponding to the two-step RA process The method according to any one of claims 1 to 2, comprising at least one of:

4. The one or more parameters are: an index corresponding to the PRACH opportunity on which the random access preamble is transmitted; or At least one least significant bit (LSB) of the system frame number (SFN) The method according to any one of claims 1 to 3, comprising:

5. The method of claim 4, wherein the at least one LSB of the SFN is signaled by downlink control information (DCI).

6. In response to an RA window being greater than 10 milliseconds, the at least one LSB of the SFN comprises 2 bits; or 5. The method of claim 4, wherein in response to the RA window being less than or equal to 10 milliseconds, the at least one LSB of the SFN comprises a zero bit.

7. A method as described in any one of claims 1 to 4, wherein the specific duration corresponding to the PRACH opportunity comprises the duration of a single slot for an SCS that is 120 kHz.

8. An apparatus for wireless communication, comprising: a memory storing instructions; a processor in communication with the memory; Equipped with An apparatus, wherein when the processor executes the instructions, the processor is configured to cause the apparatus to perform the method of any of claims 1 to 7.

9. A non-transitory computer-readable storage medium storing instructions, the instructions being configured to, when executed by a processor, cause the processor to perform a method as described in any one of claims 1 to 7.

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