Method, device and system for calculating and configuring random access channel

Abstract

The present disclosure describes methods, systems and devices for calculating and configuring a random access channel (RACH). A method includes: configuring a physical random access channel (PRACH) opportunity corresponding to a user equipment (UE) by a base station in at least one of the following ways: configuring a parameter set by the base station; calculating a radio network temporary identifier (RNTI) by the base station based on the parameter set or a PRACH opportunity for sending a random access preamble; and sending a parameter set for a PRACH opportunity for sending a random access preamble to the UE by the base station.

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 Art

[0002] Wireless communication technology is pushing the world towards an increasingly interconnected and networked society. High-speed and low-latency wireless communications rely on efficient network resource management and allocation between user devices and wireless access network nodes (including but not limited to base stations). The next-generation network is expected to provide high-speed, low-latency and ultra-reliable communication capabilities and meet the needs of different industries and users.

[0003] For the new generation of mobile communication technology, the base station and / or user equipment needs to configure signal resources for the Physical Random Access Channel (PRACH). There are several problems / difficulties in the existing system for configuring signal resources for PRACH. For example, for high carrier frequencies, the channel bandwidth may be wider than the new radio (NR), new subcarrier spacing may be introduced; and there are difficulties / problems in how to calculate the Radio Network Temporary Identifier (RNTI).

[0004] The present disclosure describes various embodiments for calculating and configuring random access channel (RACH) opportunities, addressing at least some of the problems / difficulties associated with existing systems to improve the performance of wireless communications. Summary of the invention

[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 includes: configuring, by a base station, a physical random access channel (PRACH) opportunity corresponding to a user equipment (UE) in at least one of the following ways: configuring a parameter set by the base station; calculating, by the base station, a radio network temporary identifier (RNTI) based on the parameter set or a PRACH opportunity for sending a random access preamble; and sending, by the base station, to the UE, the parameter set for the PRACH opportunity for sending a random access preamble.

[0007] In another embodiment, the present disclosure describes a method for wireless communication. The method includes: configuring a user equipment (UE) for a physical random access channel (PRACH) opportunity by a base station in at least one of the following ways: receiving, by the UE, a parameter set for a PRACH opportunity for sending a random access preamble from the base station; and calculating, by the UE, a radio network temporary identifier (RNTI) based on the parameter set or the PRACH opportunity for sending the random access preamble.

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

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

[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. When the processing circuit executes the instructions, the processing circuit is configured to perform the above 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. When the processing circuit executes the instructions, the processing circuit is configured to perform the above method.

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

[0013] The above and other aspects and embodiments thereof are described in more detail in the drawings, the description and the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 An example of a wireless communication system including a radio network node and one or more user equipments is shown.

[0015] Figure 2 An example of a network node is shown.

[0016] Figure 3 An example of a user device is shown.

[0017] Figure 4 A flow chart of a method for wireless communication is shown.

[0018] Figure 5 A flow chart of a method for wireless communication is shown.

[0019] Fig. 6A A schematic diagram of a method for wireless communication is shown.

[0020] Figure 6B A schematic diagram of a method for wireless communication is shown.

[0021] Figure 7 A schematic diagram of a method for wireless communication is shown.

[0022] Figure 8 A schematic diagram of a method for wireless communication is shown.

[0023] Fig. 9 A flow chart of a method for wireless communication is shown.

[0024] Fig.10 A schematic diagram of a method for wireless communication is shown.

[0025] Fig.11 A schematic diagram of a method for wireless communication is shown. DETAILED DESCRIPTION

[0026] The present disclosure will be described in detail below with reference to the accompanying drawings, which form a part of the present disclosure and show specific examples of embodiments by way of illustration. However, it is noted that the present disclosure can be implemented in a variety of different forms, and therefore, the subject matter covered or claimed is intended to be construed as not being limited to any of the embodiments to be set forth below.

[0027] Throughout the specification and claims, terms may have nuanced meanings that are suggested or implied in the context beyond the explicitly defined meanings. 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 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. For example, it is intended that the claimed subject matter includes, in whole or in part, a combination of exemplary embodiments or embodiments.

[0028] Typically, terms may be understood at least in part from usage in context. For example, terms such as "and", "or" or "and / or" used herein may include various meanings that may depend at least in part on the context in which the terms are used. Typically, "or" if used for an association list (such as A, B or C) is intended to represent A, B and C (here used for inclusive meanings), and A, B or C (here used for exclusive meanings). In addition, depending at least in part on the context, the terms "one or more" or "at least one" 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. Similarly, depending at least in part on the context, terms such as "a", "an" or "the" may also be understood to convey singular usage or to convey plural usage. In addition, the term "based on" or "determined by..." may be understood to not necessarily be intended to convey a set of factors that are exclusive, but, also at least in part on the context, may allow for the presence of additional factors that are not necessarily explicitly described.

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

[0030] The new generation (NG) mobile communication system is pushing the world towards an increasingly interconnected and networked society. High-speed and low-latency wireless communications rely on efficient network resource management and allocation between user devices and wireless access network nodes (including but not limited to wireless base stations). The new generation network is expected to provide high-speed, low-latency and ultra-reliable communication capabilities and meet the needs of different industries and users.

[0031] This disclosure describes various embodiments for sending initial access information to a user equipment. Figure 1A wireless communication system 100 is shown, which includes a radio network node 118 (also referred to as a network base station 118) and one or more user equipment (UE) 110. The radio network node 118 may include a network base station, which may be a nodeB (NB, e.g., gNB) in a mobile telecommunication context. Each UE may communicate wirelessly with the radio network node 118 via one or more radio channels 115. For example, a first UE 110 may communicate wirelessly with the radio network node 118 via a channel including a plurality of radio channels during a specific time period. 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, PRACH preamble format, time resources, and frequency resources for PRACH transmission).

[0032] For the fifth generation mobile communication technology, the base station and / or the user equipment needs to configure signal resources for the physical random access channel (PRACH). There are several problems / difficulties in the existing system for configuring signal resources for PRACH. For example, some of the problems / difficulties are associated with the following situation: the new subcarrier spacing (SCS) of the channel bandwidth is wider in high carrier frequencies. Other problems / difficulties of the problems / difficulties are how to calculate the radio network temporary identifier (RNTI) for the introduced new subcarrier spacing. The present disclosure can solve at least some of the problems / difficulties associated with the existing system to improve the performance of wireless communications.

[0033] In various embodiments, the maximum number of slots in a radio frame or system frame may be relatively large, for example, 640 when the SCS is equal to 960 kilohertz (KHz or kHz). The function used to calculate the Radio Network Temporary Identifier (RNTI) may need to be changed.

[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 ul_carrier_id is the UL carrier used for random access preamble transmission (0 for NUL (normal uplink) carrier, 1 for SUL (supplementary uplink) carrier), 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 time slot of the PRACH opportunity in the system frame (0≤t_id<80), where t_id is determined by the value of μ (related to SCS).

[0035] For t_id values ​​greater than 80 if the PRACH subcarrier spacing (SCS) is greater than 120 KHz, the present disclosure describes some embodiments for designing the RA-RNTI value to ensure that it 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 a PRACH opportunity in which the random access preamble is sent. MSGB-RNTI can 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 time slot of the PRACH opportunity in the system frame (0≤t_id<80), where the subcarrier spacing used to determine t_id is based on the specified μ value, 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 code transmission (0 for NUL (Normal Uplink) carrier, 1 for SUL (Supplementary Uplink) carrier).

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

[0038] In some embodiments, new PRACH subcarrier spacings may be introduced, and therefore, the functions used to calculate RA-RNTI and / or MSGB-RNTI may need to change, and new rules for calculation may be created accordingly.

[0039] Figure 2 An example of an electronic device 200 for implementing a network base station is shown. The example electronic device 200 may include wireless transmission / reception (Tx / Rx) circuitry 208 to send / receive communications with UEs and / or other base stations. The electronic device 200 may also include network interface circuitry 209 to enable the base station to communicate with other base stations and / or a core network (e.g., via optical or wired interconnects, Ethernet, and / or other data transmission media / protocols). The electronic device 200 may optionally include an input / output (I / O) interface 206 to communicate with an operator or the like.

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

[0041] Figure 3 An example of an electronic device for implementing a terminal device 300 (e.g., a user equipment (UE) 300) is shown. UE 300 may be a mobile device, such as a smart phone or a mobile communication module provided in a vehicle. 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 storage device 309. The display circuit 308 may include a user interface 310. The system circuit 304 may include any combination of hardware, software, firmware, or other logic / circuits. The system circuit 304 may be implemented, for example, with one or more systems on a chip (Systems on a Chip, SoC), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), discrete analog and digital circuits, and other circuits. The system circuit 304 may be part of an implementation of any desired function in UE 300. In this regard, the system circuit 304 may include logic to facilitate operations such as: decoding and playing music and video (e.g., MP3, MP4, MPEG, AVI, FLAC, AC3, or WAV decoding and playback); running applications; accepting user input; saving and retrieving application data; establishing, maintaining, and terminating cellular phone calls or data connections (e.g., Internet connections, as one example); establishing, maintaining, and terminating wireless network connections, Bluetooth connections, or other connections; and displaying relevant information on the user interface 310. The user interface 310 and the input / output (I / O) interface 306 may include a graphical user interface, a touch-sensitive display, tactile feedback or other tactile output, voice or facial recognition input, buttons, switches, speakers, and other user interface elements. Additional examples of the I / O interface 306 may include microphones, video and still image cameras, temperature sensors, vibration sensors, rotation and orientation sensors, headphone and microphone input / output jacks, Universal Serial Bus (USB) connectors, memory card slots, radiation sensors (e.g., IR sensors), and other types of inputs.

[0042] refer to Figure 3The communication interface 302 may include a radio frequency (RF) transmit (Tx) and receive (Rx) circuit (Tx / Rx circuit) 316 that handles the transmission and reception of signals through one or more antennas 314. The communication interface 302 may include one or more transceivers. The transceiver may be a wireless transceiver that includes modulation / demodulation circuitry, a digital to analog converter (DAC), a shaping table, an analog to digital converter (ADC), a filter, a waveform shaper, a filter, a pre-amplifier, a power amplifier, and / or other logic for transmitting and receiving through one or more antennas or (for some devices) through a physical (e.g., wired) medium. The signals transmitted and received may follow any of a variety of formats, protocols, modulations (e.g., QPSK, 16-QAM, 64-QAM, or 256-QAM), frequency channels, bit rates, and encodings. As a specific example, the communication interface 302 may include a transceiver supporting transmission and reception under the following standards: 2G, 3G, BT, WiFi, Universal Mobile Telecommunications System (UMTS), High Speed ​​Packet Access (HSPA) +, 4G / Long Term Evolution (LTE) and 5G standards. However, the technology described below, whether derived from the 3rd Generation Partnership Project (3GPP), GSM Association, 3GPP2, IEEE, or from other partners or standards bodies, is applicable to other wireless communication technologies.

[0043] refer to Figure 3 , the system circuit 304 may include one or more processors 321 and a 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 implement the desired functions of the UE 300. The parameters 328 may provide and specify configuration and operating options for the instructions 326. The memory 322 may also store any BT, WiFi, 3G, 4G, 5G, or other data that the UE 300 will send or has received through the communication interface 302. In various embodiments, the system power of the UE 300 may be provided by a power storage device (such as a battery or a transformer).

[0044] The present disclosure describes the following embodiments, which may be partially or completely described in the above Figures 2 to 3 The method is implemented on the network base station and / or user equipment described in the embodiment.

[0045] refer to Figure 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). The method 400 may include at least one of the following steps: step 410, configuring a parameter set by the base station; step 420, calculating a radio network temporary identifier (RNTI) by the base station based on the parameter set or the PRACH opportunity for sending a random access preamble; and step 430, sending, by the base station, a parameter set for a PRACH opportunity for sending a random access preamble to the UE.

[0046] refer to Figure 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, a parameter set for a PRACH opportunity for sending a random access preamble from a base station; step 520, calculating, by the UE, a radio network temporary identifier (RNTI) based on the parameter set or the PRACH opportunity for sending a random access preamble.

[0047] In one embodiment, the RNTI includes at least one of the following: a random access RNTI (RA-RNTI) corresponding to a 4-step random access (RA) procedure, or a MSGB-RNTI corresponding to a 2-step RA procedure.

[0048] In another embodiment, the parameter set includes an index corresponding to a PRACH opportunity at which a 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 embodiment, a PRACH subcarrier spacing (SCS) corresponding to a PRACH opportunity includes at least one of 15kHz, 30kHz, 60kHz, 120kHz, 240kHz, 480kHz, or 960*M kHz, where M is a positive integer; and a specific SCS of a reference time slot corresponding to the PRACH opportunity includes at least one of 15kHz, 30kHz, 60kHz, 120kHz, 240kHz, 480kHz, or 960*P kHz, where P is a positive integer.

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

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

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

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

[0054] In another embodiment, 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; and in response to the PRACH SCS being 960 kHz, the system frame includes eight segments.

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

[0056] In another embodiment, each segment refers to a PRACH time slot; the segment index indicates a time slot index in a time slot where the SCS is 120 kHz; and the parameter set includes at least one LSB of the SFN and the segment index.

[0057] In another embodiment, the transmission of the parameter set includes at least one of: downlink control information (DCI) or a random access response (RAR).

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

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

[0060] like Fig. 6A As shown, a specific duration includes four segments, and the specific duration may refer to a radio frame of a specific PRACH SCS (for example, when the PRACH SCS is 480 kHz).

[0061] like Figure 6B As shown, a specific duration includes eight segments, and the specific duration may refer to a radio frame of a specific PRACH SCS (for example, when the PRACH SCS is 960 kHz).

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

[0063] In another embodiment, the LSB of the SFN and the segment index may be signaled by control information (eg, DCI or RAR).

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

[0065] Figure 7 An example of referring to a segment of a PRACH slot is shown, and the segment index refers to a slot index in a slot where the PRACH SCS is 120 kHz.

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

[0067] In one embodiment, the step of calculating the RNTI based on the parameter set or the index corresponding to the PRACH opportunity for sending the random access preamble 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 in the RA window size may be calculated, and the t_id index may be a logical RO index in the time zone (ie, RA window duration).

[0069] In one embodiment, the calculation of RA-RNTI can 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 embodiment, the calculation of MSGB-RNTI can 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 embodiment, no further parameters need to be signaled from the base station to the UE.

[0072] Figure 8 An example of a logical index of a PRACH opportunity is shown, where the logical index may include any one or all of 0, 1, 2, 3, 4, 5, 6, 7. In other embodiments, the logical index of a PRACH opportunity may include any integer between 0 and 79, inclusive.

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

[0074] In one embodiment, the specific duration corresponding to the PRACH opportunity includes at least one of: the duration of the RA window; or N*system frame, where N is a positive integer.

[0075] In another embodiment, the step of calculating the RNTI based on the parameter set or the index corresponding to the PRACH opportunity for sending the random access preamble code may include: calculating the RNTI based on 14*mod(t,80), where t is the index corresponding to the PRACH opportunity and mod is a modulo operation.

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

[0077] In another embodiment, in response to an index corresponding to a PRACH opportunity (the index including the index of the first time slot of the PRACH opportunity in the system frame), the segment index is not sent from the base station to the UE; and in response to an index corresponding to the PRACH opportunity (the index including the index of the first time slot of the PRACH opportunity in a specific duration), at least one of the following parameters is sent from the base station to the UE: the segment index or at least one LSB of the SFN.

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

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

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

[0081] In another embodiment, t_id is the index of the first time slot of a PRACH opportunity in a specific duration.

[0082] In another implementation, the RA-RNTI may be calculated as follows: 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 embodiment, only one segment may be valid or configured for a specific duration, such as, but not limited to, a time slot duration where the SCS is equal to 120 kHz, a radio frame, or a segment where the SCS is one of 120 kHz, 240 kHz, 480 kHz, or 960 kHz.

[0085] In one embodiment, different designations of t_id may correspond to different information signaling.

[0086] In another embodiment, the information signaling may indicate the segmentation and LSB for a specific duration.

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

[0088] refer to Fig. 9 , the present disclosure describes an embodiment of a method 900 for sending a set of parameters for a physical random access channel (PRACH) opportunity from a base station to a user equipment (UE). In one embodiment, the set of parameters includes at least one of the following: at least one least significant bit (LSB) of a system frame number (SFN) or a segment index. The method 900 may include step 910 of independently sending 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 embodiment, 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: two bits; or zero bits in response to the RA window being less than or equal to 10 milliseconds, 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.

[0090] In another embodiment, the segment index includes at least one of: three bits; or zero bits in response to PRACH SCS less than or equal to 120 kHz, one bit in response to PRACH SCS equal to 240 kHz, two bits in response to PRACH SCS equal to 480 kHz, and three bits in response to PRACH SCS equal to 960 kHz.

[0091] In another embodiment, the segment index includes N bits, where: N=log2(M / 120), 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 and segment index of the SFN.

[0094] In another embodiment, if the RA window>10ms, the base station may notify the UE of the LSB of the SFN; one bit corresponding to a 20ms RA window; and two bits corresponding to a 30ms or 40ms RA window.

[0095] In another embodiment, the base station may inform the UE of two bits for all cases.

[0096] In another embodiment, the base station may notify the segment index, corresponding to PRACH SCS <= 120kHz, the notification is zero bit; corresponding to PRACH SCS = 240kHz, the notification is one bit; corresponding to PRACH SCS = 480kHz, the notification is two bits; corresponding to PRACH SCS = 960kHz, the notification is three bits. In another embodiment, for all cases, the base station may notify three bits.

[0097] In various embodiments, the step of sending a parameter set for a PRACH opportunity from the base station to the UE may include at least one of the following: in response to the RA window being greater than 10 milliseconds and the PRACH SCS being less than or equal to 120 kHz, sending 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, sending 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 milliseconds and the PRACH SCS being greater than 120 kHz, sending at least one LSB of the SFN 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 less than or equal to 120 kHz, neither sending at least one LSB of the SFN from the base station nor sending a 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, sending a segment index from the base station to the UE; and in response to the RA window being less than or equal to 10 milliseconds and the PRACH When SCS is greater than 120kHz, neither at least one LSB of SFN nor the segment index is sent from the base station to the UE; in response to the RA window and PRACH SCS, at least one LSB of SFN and the segment index are sent from the base station; in response to the RA window and PRACH SCS, at least one LSB of SFN is sent from the base station to the UE; in response to the RA window and PRACH SCS, neither at least one LSB of SFN is sent from the base station to the UE nor the segment index is sent from the base station to the UE; in response to the RA window and PRACH SCS, the segment index is sent from the base station to the UE.

[0098] In one embodiment, at least one LSB of the SFN and the 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 notifying a UE of an LSB and a segment index of a SFN from a base station.

[0100] In case 1, when the RA window > 10ms and PRACH SCS <= 120kHz, only the LSB of the SFN is notified;

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

[0102] In case 3, when the RA window is <= 10 ms and the PRACH SCS is <= 120 kHz, no notification is performed;

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

[0104] In one embodiment, for all cases, the base station notifies five bits. In another embodiment, for all cases, the base station notifies N bits, where N can be any integer between 0 and 5 (including 0 and 5), and N can be a value as shown in Table 1, and ' / ' refers to 'or' in Table 1.

[0105] Table 1: Number of bits from base station to UE

[0106]

[0107]

[0108] In another embodiment, the index order in Table 1 can be combined in any order.

[0109] For example, Fig.10 As shown in FIG. 1 , when RA window = 20 ms and PRACH SCS = 960 kHz, the specific duration may refer to 20 ms and include 16 segments. Each segment may contain 80 time slots. The index of each segment is as follows: Fig.10 As shown. 4 bits may be needed to indicate the index of the segment. This case corresponds to Table 1 where 'index' is equal to 7, 'RA window' is equal to 20ms, 'PRACH SCS' is equal to 960kHz, and 'number of bits' is equal to 4 bits.

[0110] For the first segment, the 4 bits may be '0000'.

[0111] For the second segment, the 4 bits may be '0001', and so on.

[0112] For the sixteenth segment, 4 bits may be '1111'.

[0113] In various embodiments, at least one LSB of the SFN and the segment index may include five bits.

[0114] In one implementation, the base station may independently inform the UE of the LSB and segment index of the SFN.

[0115] In another embodiment, for all cases, the base station notifies 5 bits. In another embodiment, for all cases, the base station notifies N bits, where N can be any integer between 0 and 5 (including 0 and 5), and N can be a value as shown in Table 1.

[0116] For Fig.11 As another example, when the RA window = 40 ms and the PRACH time slot = 960 kHz, the specific duration may refer to 40 ms, and 32 segments may be included in the 40 ms. Each segment may contain 80 time slots. The index of the segment is as follows: Fig.11 As shown. 5 bits may be needed to indicate the index of the segment. This case corresponds to Table 1 where 'index' is equal to 15, 'RA window' is equal to 40ms, 'PRACH SCS' is equal to 960kHz, and 'number of bits' is equal to 5 bits.

[0117] For the first segment, 5 bits can be '00000'

[0118] For the second segment, the 5 bits may be '00001', and so on.

[0119] For the sixteenth segment, the 5 bits may be '01111', and so on.

[0120] For the 32nd segment, 5 bits may be '11111'.

[0121] The present disclosure describes methods, apparatus, and computer-readable media for wireless communications. The present disclosure solves problems associated with calculating and configuring a random access channel (RACH). The methods, devices, and computer-readable media described in the present disclosure can improve the performance of wireless transmissions between user equipment and base stations, thereby improving efficiency and overall performance. The methods, devices, and computer-readable media described in the present disclosure can improve the overall efficiency of a wireless communication system.

[0122] Throughout the specification, references to features, advantages, or similar language do not mean that all features and advantages that can be achieved with the present solution should be or are included in any single embodiment of the present solution. Rather, language referencing features and advantages is understood to mean that a particular feature, advantage, or characteristic described in connection with an embodiment is included in at least one embodiment of the present solution. Therefore, throughout the specification, discussion of features and advantages and similar language may, but do not necessarily, refer to the same embodiment.

[0123] Furthermore, in one or more embodiments, the features, advantages, and characteristics of the present solution may be combined in any suitable manner. One of ordinary skill in the relevant art will recognize, based on the description herein, that the present 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 present solution.

Claims

1. A method for wireless communication, comprising: The base station configures a physical random access channel PRACH opportunity corresponding to the user equipment UE in at least one of the following ways: The base station calculates a radio network temporary identifier RNTI based on the PRACH opportunity for sending a random access preamble; The PRACH subcarrier spacing SCS corresponding to the PRACH opportunity includes 480kHz or 960kHz; and The index corresponding to the PRACH opportunity of the PRACH SCS including 480kHz or 960kHz is a timeslot index for a specific duration of the SCS of 120kHz.

2. The method according to claim 1, wherein: The RNTI includes at least one of the following: The RA-RNTI corresponding to the four-step random access RA procedure, or MSGB-RNTI corresponding to the two-step RA procedure.

3. The method according to claim 1 or 2, wherein: The specific SCS of the duration corresponding to the PRACH opportunity includes at least one of the following: 15 kHz, 30 kHz, 60 kHz, 120 kHz, 240 kHz, 480 kHz or 960*P kHz, where P is a positive integer.

4. The method according to claim 1 or 2, wherein: The index corresponding to the PRACH opportunity includes an index of a first time slot of the PRACH opportunity in the segment in which the random access preamble is transmitted.

5. The method according to claim 1 or 2, wherein: The index corresponding to the PRACH opportunity comprises a logical RACH opportunity index in a segment.

6. The method according to claim 4, wherein: In response to the PRACH SCS being 480 kHz, the system frame includes four segments; and In response to the PRACH SCS being 960 kHz, the system frame includes eight segments.

7. The method according to claim 1 or 2, wherein: The index corresponding to the PRACH opportunity at which the random access preamble is transmitted comprises a logical RACH opportunity index in the RA window duration.

8. The method according to claim 1, wherein: The RNTI includes a random access radio network temporary identifier RA-RNTI; The RA-RNTI is calculated by the following function: RA-RNTI = 1+s_id+14×t_id+14×80×f_id+14×80×8×ul_carrier_id; Wherein, ul_carrier_id is the UL carrier used for random access preamble transmission, s_id is the index of the first OFDM symbol of the PRACH opportunity; t_id is the index of the first time slot of the PRACH opportunity in the system frame, wherein t_id is determined by the value of μ associated with the SCS; The corresponding specific SCS of μ related to the SCS includes at least one of the following: 15 kHz, 30 kHz, 60 kHz, 120 kHz, 240 kHz, 480 kHz or 960*P kHz, where P is a positive integer.

9. The method according to claim 1, wherein: The RNTI includes a msg-B radio network temporary identifier MSGB-RNTI; The MSGB-RNTI is calculated by the following function: MSGB-RNTI = 1+s_id+14×t_id+14×80×f_id+14×80×8×ul_carrier_id+ 14×80×8×2; Wherein, ul_carrier_id is the UL carrier used for random access preamble transmission, s_id is the index of the first OFDM symbol of the PRACH opportunity; t_id is the index of the first time slot of the PRACH opportunity in the system frame, wherein t_id is determined by the value of μ associated with the SCS; The corresponding specific SCS of μ related to the SCS includes at least one of the following: 15 kHz, 30 kHz, 60 kHz, 120 kHz, 240 kHz, 480 kHz or 960*P kHz, where P is a positive integer.

10. A method for wireless communication, comprising: The base station configures the user equipment UE for the physical random access channel PRACH opportunity in at least one of the following ways: Calculating, by the UE, a radio network temporary identifier RNTI based on the PRACH opportunity for sending a random access preamble; The PRACH subcarrier spacing SCS corresponding to the PRACH opportunity includes 480kHz or 960kHz; The index corresponding to the PRACH opportunity of the PRACH SCS including 480kHz or 960kHz is a timeslot index for a specific duration of the SCS of 120kHz.

11. The method according to claim 10, wherein: The RNTI includes at least one of the following: The RA-RNTI corresponding to the four-step random access RA procedure, or MSGB-RNTI corresponding to the two-step RA procedure.

12. The method according to claim 10 or 11, wherein: The specific SCS of the duration corresponding to the PRACH opportunity includes at least one of the following: 15 kHz, 30 kHz, 60 kHz, 120 kHz, 240 kHz, 480 kHz or 960*P kHz, where P is a positive integer.

13. The method according to claim 10 or 11, wherein: The index corresponding to the PRACH opportunity includes an index of a first time slot of the PRACH opportunity in the segment in which the random access preamble is transmitted.

14. The method according to claim 10 or 11, wherein: The index corresponding to the PRACH opportunity comprises a logical RACH opportunity index in a segment.

15. The method of claim 13, wherein: In response to the PRACH SCS being 480 kHz, the system frame includes four segments; and In response to the PRACH SCS being 960 kHz, the system frame includes eight segments.

16. The method according to claim 10 or 11, wherein: The index corresponding to the PRACH opportunity at which the random access preamble is transmitted comprises a logical RACH opportunity index in the RA window duration.

17. An apparatus for wireless communication, comprising: a memory for storing instructions; as well as a processor in communication with the memory, wherein when the processor executes the instructions, the processor is configured to cause the apparatus to perform: A physical random access channel PRACH opportunity corresponding to the user equipment UE is configured in at least one of the following ways: Calculating a radio network temporary identifier RNTI based on the PRACH opportunity for sending a random access preamble; The PRACH subcarrier spacing SCS corresponding to the PRACH opportunity includes 480kHz or 960kHz; and The index corresponding to the PRACH opportunity of the PRACH SCS including 480kHz or 960kHz is a timeslot index for a specific duration of the SCS of 120kHz.

18. The device according to claim 17, wherein: The RNTI includes at least one of the following: The RA-RNTI corresponding to the four-step random access RA procedure, or MSGB-RNTI corresponding to the two-step RA procedure.

19. A computer program product, comprising a computer-readable program medium, on which instructions are stored, wherein: When the instructions are executed by a processor, they are configured to cause the processor to execute: A physical random access channel PRACH opportunity corresponding to the user equipment UE is configured in at least one of the following ways: Calculating a radio network temporary identifier RNTI based on the PRACH opportunity for sending a random access preamble; The PRACH subcarrier spacing SCS corresponding to the PRACH opportunity includes 480kHz or 960kHz; and The index corresponding to the PRACH opportunity of the PRACH SCS including 480kHz or 960kHz is a timeslot index for a specific duration of the SCS of 120kHz.

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