Method and apparatus for NR unlicensed wideband PRACH configuration

Abstract

A method for a user equipment (UE) in a wireless communication system supporting shared spectrum channel access is provided. The method includes: receiving configuration information associated with a subcarrier spacing (SCS) of a physical random access channel (PRACH) preamble, a root sequence index of the PRACH preamble, and zero correlation zone (ZCZ) configuration information from a base station (BS); determining a sequence length of the PRACH preamble based on the configuration information associated with the SCS of the PRACH preamble; determining a sequence number of the PRACH preamble based on the root sequence index; determining a cyclic shift of the PRACH preamble based on the ZCZ configuration information; and sending a PRACH preamble based on the sequence number, the cyclic shift, and the sequence length to the base station.

Description

Technical Field

[0001] The present application relates generally to wireless communication systems, and more particularly, the present disclosure relates to wideband PRACH (Physical Random Access Channel) configuration in NR (New Radio) unlicensed. Background Art

[0002] The communication system includes a downlink (DL) that transmits signals from a transmission point (such as a base station (BS) or NodeB) to a user equipment (UE) and an uplink (UL) that transmits signals from the UE to a reception point (such as a NodeB). A UE (also commonly referred to as a terminal or mobile station) may be fixed or mobile and may be a cellular phone, a personal computer device, or an automation device. An eNodeB (eNB) (referring to a NodeB in a long term evolution (LTE) communication system) and a gNodeB (gNB) (referring to a NodeB in a new radio (NR) communication system) may also be referred to as an access point or other equivalent terms.

[0003] In order to meet the demand for increased wireless data traffic since the deployment of the fourth generation (4G) communication system, efforts have been made to develop improved fifth generation (5G) or pre-5G communication systems. 5G or pre-5G communication systems are also called "super 4G networks" or "post-long term evolution (LTE) systems". 5G communication systems are considered to be implemented in higher frequency (millimeter wave) bands (e.g., 60 GHz bands) in order to achieve higher data rates. In order to reduce the propagation loss of radio waves and increase the transmission distance, beamforming, massive multiple input multiple output (MIMO), full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and massive antenna technology are discussed for 5G communication systems. In addition, in 5G communication systems, development is underway for system network improvements based on advanced small cells, cloud radio access networks (RAN), ultra-dense networks, device-to-device (D2D) communications, wireless backhaul, mobile networks, collaborative communications, coordinated multi-point (CoMP), receiving-end interference cancellation, etc. In the 5G system, hybrid frequency shift keying (FSK) and Feher's quadrature amplitude modulation (FQAM) and sliding window superposition coding (SWSC) have been developed as advanced coded modulation (ACM), and filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA) and sparse code multiple access (SCMA) have been developed as advanced access technologies.

[0004] The Internet, as a human-centered connectivity network in which humans generate and consume information, is now evolving toward the Internet of Things (IoT), in which distributed entities (such as things) exchange and process information without human intervention. The Internet of Everything (IoE), which is a combination of IoT technology and big data processing technology through connection with a cloud server, has emerged. Since technical elements such as "sensing technology", "wired / wireless communication and network infrastructure", "service interface technology" and "security technology" are required for IoT implementation, sensor networks, machine-to-machine (M2M) communication, machine type communication (MTC), etc. have been studied recently. This IoT environment can provide smart Internet technology services that create new value for human life by collecting and analyzing data generated between connected things. IoT can be applied to various fields including smart homes, smart buildings, smart cities, smart cars or connected cars, smart grids, healthcare, smart appliances, and advanced medical services through the integration and combination between existing information technology (IT) and various industrial applications.

[0005] In view of this, various attempts have been made to apply 5G communication systems to IoT networks. For example, technologies such as sensor networks, MTC, and M2M communications can be implemented through beamforming, MIMO, and array antennas. Cloud RAN as an application of the above-mentioned big data processing technology can also be considered an example of the fusion between 5G technology and IoT technology.

[0006] As described above, various services can be provided according to the development of a wireless communication system, and thus a method for easily providing such services is required. Summary of the invention

[0007] Technical Solution

[0008] A method for a user equipment (UE) in a wireless communication system supporting shared spectrum channel access is provided. The method comprises: receiving a high-level parameter set from a base station (BS), the high-level parameter set comprising a subcarrier spacing (SCS) of a physical random access channel (PRACH) preamble code, a logical root index (i log ) and index (zeroCorrelationZoneConfg); determine the sequence length of the PRACH preamble code based on the subcarrier spacing of the PRACH preamble code (L RA ); based on the logical root index (i log ) to determine the physical root index (i) of the PRACH preamble phy ); Determine the cyclic shift (N) of the PRACH preamble based on the index (zeroCorrelationZoneConfg) CS); Based on the determined sequence length L RA , the determined physical root index i phy and the determined cyclic shift N CS to generate a PRACH preamble code; and send the PRACH preamble code to a base station (BS) through a shared spectrum channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] For a more complete understanding of the present disclosure and its advantages, reference is now made to the following description taken in conjunction with the accompanying drawings, wherein like reference numerals represent like parts:

[0010] Figure 1 An example wireless network according to an embodiment of the present disclosure is shown;

[0011] Figure 2 An example gNB according to an embodiment of the present disclosure is shown;

[0012] Figure 3 An example UE according to an embodiment of the present disclosure is shown;

[0013] Figure 4 An example transmitter structure using OFDM (Orthogonal Frequency Division Multiplexing) according to an embodiment of the present disclosure is shown;

[0014] Figure 5 An example receiver structure using OFDM according to an embodiment of the present disclosure is shown;

[0015] Figure 6 An example encoding process of a DCI (Downlink Control Information) format according to an embodiment of the present disclosure is shown;

[0016] Figure 7 An example decoding process for a DCI format for use with a UE according to an embodiment of the present disclosure is shown;

[0017] Figure 8 An example channel access process according to an embodiment of the present disclosure is shown;

[0018] Fig. 9 An uplink bandwidth part (BWP) according to an embodiment of the present disclosure is shown;

[0019] Fig.10 Another uplink bandwidth part (BWP) according to an embodiment of the present disclosure is shown;

[0020] Fig.11A shows an example nominal channel BW according to an embodiment of the present disclosure;

[0021] Fig. 11B Another example nominal channel BW according to an embodiment of the present disclosure is shown;

[0022] Fig. 12A shows an example UL BWP with frequency offset according to an embodiment of the present disclosure;

[0023] Fig. 12B Another example UL BWP with frequency offset according to an embodiment of the present disclosure is shown;

[0024] Fig.13 shows yet another example UL BWP with frequency offset according to an embodiment of the present disclosure;

[0025] Fig.14 shows yet another example UL BWP with frequency offset according to an embodiment of the present disclosure;

[0026] Fig.15 shows an example LBT (Listen Before Talk) gap indication according to an embodiment of the present disclosure;

[0027] Fig.16 Another example LBT gap indication according to an embodiment of the present disclosure is shown;

[0028] Fig.17 Another example LBT gap indication according to an embodiment of the present disclosure is shown;

[0029] Fig.18 shows an example RACH opportunity in a RACH slot according to an embodiment of the present disclosure;

[0030] Fig.19 Another example RACH opportunity in a RACH time slot according to an embodiment of the present disclosure is shown;

[0031] Fig. 20 Another example RACH opportunity in a RACH time slot according to an embodiment of the present disclosure is shown;

[0032] Fig.21A An example RACH procedure according to an embodiment of the present disclosure is shown;

[0033] Fig. 21B An example RACH procedure according to an embodiment of the present disclosure is shown;

[0034] Fig. 22 An example general structure of a short preamble according to an embodiment of the present disclosure is shown;

[0035] Fig.23A shows an example timing gap between RO (RACH opportunity) and PO (PUSCH opportunity) of a two-step RACH according to an embodiment of the present disclosure;

[0036] Fig. 23B shows an example timing gap between RO and PO of a two-step RACH according to an embodiment of the present disclosure;

[0037] Fig.24 shows an example RACH preamble transmission interference according to an embodiment of the present disclosure;

[0038] Fig.25 An example gap placement time (GAP) according to an embodiment of the present disclosure is shown;

[0039] Fig.26 shows example PUSCH transmission interference according to an embodiment of the present disclosure;

[0040] Fig. 27 An example placement quiet period (GAP) according to an embodiment of the present disclosure is shown;

[0041] Fig.28 An example scheduling PUSCH transmission according to an embodiment of the present disclosure is shown;

[0042] Fig.29 Another example scheduling PUSCH transmission according to an embodiment of the present disclosure is shown;

[0043] Fig.30 Another example of scheduling PUSCH transmission according to an embodiment of the present disclosure is shown;

[0044] Fig.31 Another example of scheduling PUSCH transmission according to an embodiment of the present disclosure is shown;

[0045] Fig.32 Another example of scheduling PUSCH transmission according to an embodiment of the present disclosure is shown;

[0046] Fig.33 Another example of scheduling PUSCH transmission according to an embodiment of the present disclosure is shown;

[0047] Fig.34 A flow chart of a method for wideband PRACH configuration according to an embodiment of the present disclosure is shown;

[0048] Fig.35 A base station (BS) according to an embodiment of the present disclosure is shown;

[0049] Fig.36 A user equipment (UE) according to an embodiment of the present disclosure is shown;

[0050] Fig.37 A flow chart illustrating a method performed by a user equipment (UE) in a wireless communication system is shown; and

[0051] Fig.38 A flow chart illustrating a method performed by a base station (BS) in a wireless communication system is shown. DETAILED DESCRIPTION

[0052] The present disclosure relates to a pre-5G or 5G communication system to be provided for wideband PRACH (Physical Random Access Channel) configuration in NR unlicensed.

[0053] In one embodiment, a user equipment (UE) in a wireless communication system supporting shared spectrum channel access is provided. The UE may include a transceiver configured to receive a high-level parameter set from a base station (BS), the high-level parameter set including a subcarrier spacing of a physical random access channel (PRACH) preamble, a logical root index (i log ) and index (zeroCorrelationZoneConfg). The UE may also include a processor operably connected to the transceiver, the processor being configured to: determine a sequence length (L of the PRACH preamble code based on the subcarrier spacing of the PRACH preamble code; RA ); based on the logical root index (i log ) to determine the physical root index (i) of the PRACH preamble phy ); Determine the cyclic shift (N) of the PRACH preamble based on the index (zeroCorrelationZoneConfg) CS ); and based on the determined sequence length L RA , the determined physical root index i phy and the determined cyclic shift N CS To generate a PRACH preamble code. The transceiver of the UE may also be configured to send the PRACH preamble code to a base station (BS) through a shared spectrum channel.

[0054] In one embodiment, when the subcarrier spacing of the PRACH preamble code is 15 kHz, the sequence length (L RA ) is set to 1151. In addition, when the subcarrier spacing of the PRACH preamble code is 30kHz, the sequence length (L RA ) is set to 571.

[0055] In one embodiment, for a logical root index i log =2·i, the physical root index (i phy ) is determined as i phy =i+1. In addition, for the logical root index i log =2·i+1, the physical root index (i phy ) is determined as i phy =L RA -i-1, where 0≤i≤(L RA -1) / 2-1.

[0056] In one embodiment, when LRA =1151, the cyclic shift (N CS ) is determined as follows: When the index (zeroCorrelationZoneConfg) is 0, N CS =0; when the index (zeroCorrelationZoneConfg) is 1, N CS =17; when the index (zeroCorrelationZoneConfg) is 2, N CS =20; when the index (zeroCorrelationZoneConfg) is 3, N CS =25; when the index (zeroCorrelationZoneConfg) is 4, N CS =30; when the index (zeroCorrelationZoneConfg) is 5, N CS =35; when the index (zeroCorrelationZoneConfg) is 6, N CS =44; when the index (zeroCorrelationZoneConfg) is 7, N CS =52; when the index (zeroCorrelationZoneConfg) is 8, N CS =63; when the index (zeroCorrelationZoneConfg) is 9, N CS =82; when the index (zeroCorrelationZoneConfg) is 10, N CS =104; when the index (zeroCorrelationZoneConfg) is 11, N CS =127; when the index (zeroCorrelationZoneConfg) is 12, N CS =164; when the index (zeroCorrelationZoneConfg) is 13, N CS =230; when the index (zeroCorrelationZoneConfg) is 14, N CS =383; when the index (zeroCorrelationZoneConfg) is 15, N CS =575.

[0057] L RA =571, the cyclic shift can be N CS Determined as follows: When the index (zeroCorrelationZoneConfg) is 0, N CS=0; when the index (zeroCorrelationZoneConfg) is 1, N CS =8; when the index (zeroCorrelationZoneConfg) is 2, N CS =10; when the index (zeroCorrelationZoneConfg) is 3, N CS =12; when the index (zeroCorrelationZoneConfg) is 4, N CS =15; when the index (zeroCorrelationZoneConfg) is 5, N CS =17; when the index (zeroCorrelationZoneConfg) is 6, N CS =21; when the index (zeroCorrelationZoneConfg) is 7, N CS =25; when the index (zeroCorrelationZoneConfg) is 8, N CS =31; when the index (zeroCorrelationZoneConfg) is 9, N CS =40; when the index (zeroCorrelationZoneConfg) is 10, N CS =51; when the index (zeroCorrelationZoneConfg) is 11, N CS =63; when the index (zeroCorrelationZoneConfg) is 12, N CS =81; when the index (zeroCorrelationZoneConfg) is 13, N CS =114; when the index (zeroCorrelationZoneConfg) is 14, N CS =190; when the index (zeroCorrelationZoneConfg) is 15, N CS =285.

[0058] In one embodiment, the high layer parameter set may also include information to configure a gap for performing a listen-before-talk (LBT) process before sending the PRACH preamble.

[0059] In one embodiment, the gap for performing the LBT process may be determined as a RACH opportunity with an even index, and the transmission of the PRACH preamble is transmitted in the next RACH opportunity with an odd index.

[0060] In another embodiment, a base station (BS) in a wireless communication system supporting shared spectrum channel access is provided. The BS may include a processor configured to identify a high-level parameter set, the high-level parameter set including a subcarrier spacing of a physical random access channel (PRACH) preamble, a logical root index (i log ) and index (zeroCorrelationZoneConfg). The BS may also include a transceiver operably connected to the processor, the transceiver configured to send a high-layer parameter set to a user equipment (UE) and receive a sequence length L based on the sequence length L from the UE through a shared spectrum channel. RA , physical root index i phy and cyclic shift N CS The PRACH preamble code is determined based on the subcarrier spacing of the PRACH preamble code. RA ), based on the logical root index (i log ) determines the physical root index (i) for the PRACH preamble phy ), and determine the cyclic shift (N) for the PRACH preamble based on the index (zeroCorrelationZoneConfg) CS ).

[0061] In another embodiment, when the subcarrier spacing of the PRACH preamble code is 15 kHz, the sequence length (L RA ) is set to 1151. In addition, for the logical root index i log =2i+1, the physical root index (i phy ) is determined as i phy =L RA -i-1, where 0≤i≤(L RA -1) / 2-1.

[0062] In another embodiment, when L RA =1151, the cyclic shift (N CS ) is determined as follows: When the index (zeroCorrelationZoneConfg) is 0, N CS =0; when the index (zeroCorrelationZoneConfg) is 1, N CS =17; when the index (zeroCorrelationZoneConfg) is 2, N CS =20; when the index (zeroCorrelationZoneConfg) is 3, N CS =25; when the index (zeroCorrelationZoneConfg) is 4, N CS=30; when the index (zeroCorrelationZoneConfg) is 5, N CS =35; when the index (zeroCorrelationZoneConfg) is 6, N CS =44; when the index (zeroCorrelationZoneConfg) is 7, N CS =52; when the index (zeroCorrelationZoneConfg) is 8, N CS =63; when the index (zeroCorrelationZoneConfg) is 9, N CS =82; when the index (zeroCorrelationZoneConfg) is 10, N CS =104; when the index (zeroCorrelationZoneConfg) is 11, N CS =127; when the index (zeroCorrelationZoneConfg) is 12, N CS =164; when the index (zeroCorrelationZoneConfg) is 13, N CS =230; when the index (zeroCorrelationZoneConfg) is 14, N CS =383; when the index (zeroCorrelationZoneConfg) is 15, N CS =575.

[0063] In another embodiment, when L RA =571, the cyclic shift N CS Determined as follows: When the index (zeroCorrelationZoneConfg) is 0, N CS =0; when the index (zeroCorrelationZoneConfg) is 1, N CS =8; when the index (zeroCorrelationZoneConfg) is 2, N CS =10; when the index (zeroCorrelationZoneConfg) is 3, N CS =12; when the index (zeroCorrelationZoneConfg) is 4, N CS =15; when the index (zeroCorrelationZoneConfg) is 5, N CS =17; when the index (zeroCorrelationZoneConfg) is 6, NCS =21; when the index (zeroCorrelationZoneConfg) is 7, N CS =25; when the index (zeroCorrelationZoneConfg) is 8, N CS =31; when the index (zeroCorrelationZoneConfg) is 9, N CS =40; when the index (zeroCorrelationZoneConfg) is 10, N CS =51; when the index (zeroCorrelationZoneConfg) is 11, N CS =63; when the index (zeroCorrelationZoneConfg) is 12, N CS =81; when the index (zeroCorrelationZoneConfg) is 13, N CS =114; when the index (zeroCorrelationZoneConfg) is 14, N CS =190; when the index (zeroCorrelationZoneConfg) is 15, N CS =285.

[0064] In another embodiment, the higher layer parameter set may further include information for configuring a gap for performing a listen-before-talk (LBT) process before sending the PRACH preamble.

[0065] In another embodiment, the gap for performing the LBT process may be determined as a RACH opportunity with an even-numbered index, and the transmission of the PRACH preamble may be performed in the next RACH opportunity with an odd-numbered index.

[0066] In another embodiment, a method for a user equipment (UE) in a wireless communication system supporting shared spectrum channel access is provided. The method includes: receiving a high-level parameter set from a base station (BS), the high-level parameter set including a subcarrier spacing of a physical random access channel (PRACH) preamble code, a logical root index (i log ) and index (zeroCorrelationZoneConfg); determine the sequence length of the PRACH preamble code based on the subcarrier spacing of the PRACH preamble code (L RA ); based on the logical root index (i log ) to determine the physical root index (i) of the PRACH preamble phy); Determine the cyclic shift (N) of the PRACH preamble based on the index (zeroCorrelationZoneConfg) CS ); Based on the determined sequence length L RA , the determined physical root index i phy and the determined cyclic shift N CS to generate a PRACH preamble code; and send the PRACH preamble code to a base station (BS) through a shared spectrum channel.

[0067] In one embodiment, a method for operating a terminal in a wireless communication system is provided. The method may include receiving configuration information associated with a subcarrier spacing (SCS) of a physical random access channel (PRACH) preamble, a root sequence index of the PRACH preamble, and zero correlation zone (ZCZ) configuration information from a base station; determining a sequence length of the PRACH preamble based on the configuration information associated with the SCS of the PRACH preamble; determining a sequence number of the PRACH preamble based on the root sequence index; determining a cyclic shift of the PRACH preamble based on the ZCZ configuration information; and sending a PRACH preamble based on the sequence number, cyclic shift, and sequence length to the base station.

[0068] In one embodiment, when the SCS of the PRACH preamble is 15 kHz, the sequence length is set to 1151. In addition, when the SCS of the PRACH preamble is 30 kHz, the sequence length is set to 571.

[0069] In one embodiment, when the root sequence index is an even number, the sequence number is determined as (root sequence index / 2+1), and when the root sequence index is an odd number, the sequence number is determined as (sequence length-i-1), where i=(root sequence index-1) / 2, and 0≤i≤(sequence length-1) / 2-1. In one embodiment, determining the cyclic shift of the PRACH preamble based on the ZCZ configuration information may include determining N based on the ZCZ configuration information and the sequence length. CS value; and based on N CS The value is used to determine the cyclic shift of the PRACH preamble code.

[0070] In one embodiment, when the sequence length is 1151, N CS The value is determined as follows: When the index of the ZCZ configuration information is 0, N CS The value is 0; when the index of the ZCZ configuration information is 1, N CS The value is 17; when the index of the ZCZ configuration information is 3, N CS The value is 25; when the index of the ZCZ configuration information is 4, N CSThe value is 30; when the index of the ZCZ configuration information is 5, N CS The value is 35; when the index of the ZCZ configuration information is 6, N CS The value is 44; when the index of the ZCZ configuration information is 7, N CS The value is 52; when the index of the ZCZ configuration information is 8, N CS The value is 63; when the index of the ZCZ configuration information is 9, N CS The value is 82; when the index of the ZCZ configuration information is 10, N CS The value is 104; when the index of the ZCZ configuration information is 11, N CS The value is 127; when the index of the ZCZ configuration information is 12, N CS The value is 164; when the index of the ZCZ configuration information is 13, N CS The value is 230; when the index of the ZCZ configuration information is 14, N CS The value is 383; and when the index of the ZCZ configuration information is 15, N CS The value is 575.

[0071] In one embodiment, when the sequence length is 571, N CS The value is determined as follows: When the index of the ZCZ configuration information is 0, N CS The value is 0; when the index of the ZCZ configuration information is 1, N CS The value is 8; when the index of the ZCZ configuration information is 2, N CS The value is 10; when the index of the ZCZ configuration information is 3, N CS The value is 12; when the index of the ZCZ configuration information is 4, N CS The value is 15; when the index of the ZCZ configuration information is 5, N CS The value is 17; when the index of the ZCZ configuration information is 6, N CS The value is 21; when the index of the ZCZ configuration information is 63, N CS The value is 25; when the index of the ZCZ configuration information is 8, N CS The value is 31; when the index of the ZCZ configuration information is 9, N CS The value is 40; when the index of the ZCZ configuration information is 10, N CS The value is 51; when the index of the ZCZ configuration information is 11, N CS The value is 63; when the index of the ZCZ configuration information is 12, N CS The value is 81; when the index of the ZCZ configuration information is 13, N CS The value is 114; when the index of the ZCZ configuration information is 14, N CS The value is 190; and when the index of the ZCZ configuration information is 15, NCS The value is 285.

[0072] In one embodiment, the method may also include determining the number of resource blocks used for PUSCH based on configuration information associated with the SCS of PUSCH for initial access; determining a value for generating a baseband signal for a PRACH preamble based on at least one of the sequence length, the SCS of PRACH, the configuration information associated with the SCS of PUSCH for initial access, or the number of resource blocks used for PUSCH; and generating a baseband signal for the PRACH preamble based on the determined value.

[0073] In one embodiment, determining the number of resource blocks for PUSCH may include, when the SCS of PUSCH for initial access is 15, when the sequence length is 571 or 1151, determining that the number of resource blocks for PUSCH is equal to 96; when the SCS of PUSCH for initial access is 30, when the sequence length is 571 or 1151, determining that the number of resource blocks for PUSCH is equal to 48; and when the SCS of PUSCH for initial access is 60, when the sequence length is 571 or 1151, determining that the number of resource blocks for PUSCH is equal to 24.

[0074] In one embodiment, determining the value used to generate a baseband signal for a PRACH preamble code may include: when the sequence length is 571, determining that the value used to generate a baseband signal for a PRACH preamble code is equal to 2; and when the sequence length is 1151, determining that the value used to generate a baseband signal for a PRACH preamble code is equal to 1.

[0075] In another embodiment, a method for operating a base station (BS) in a wireless communication system is provided. The method may include sending configuration information associated with a subcarrier spacing (SCS) of a physical random access channel (PRACH) preamble, a root sequence index of the PRACH preamble, and zero correlation zone (zeroCorrelationZone, ZCZ) configuration information to a terminal; and receiving a PRACH preamble based on a sequence number of the PRACH preamble, a cyclic shift of the PRACH preamble, and a sequence length of the PRACH preamble from the terminal, wherein the sequence length of the PRACH preamble is determined based on the configuration information associated with the SCS of the PRACH preamble; wherein the sequence number of the PRACH preamble is determined based on the root sequence index; and the cyclic shift of the PRACH preamble is determined based on the ZCZ configuration information.

[0076] In another embodiment, when the SCS of the PRACH preamble code is 15 kHz, the sequence length is set to 1151; and when the SCS of the PRACH preamble code is 30 kHz, the sequence length is set to 571.

[0077] In another embodiment, when the root sequence index is an even number, the sequence number is determined as (root sequence index / 2+1); and when the root sequence index is an odd number, the sequence number is determined as (sequence length-i-1), where i=(root sequence index-1) / 2, and O≤i≤(sequence length-1) / 2-1.

[0078] In another embodiment, based on N CS value to determine the cyclic shift of the PRACH preamble code; and determine N based on the ZCZ configuration information and the sequence length CS value.

[0079] Other technical features will be apparent to those skilled in the art from the following drawings, description and claims.

[0080] Before proceeding to the following inventive mode, it may be advantageous to set forth the definitions of certain words and phrases used throughout this patent document. The term "coupling" and its derivatives refer to any direct or indirect communication between two or more elements, whether or not these elements are in physical contact with each other. The terms "send", "receive" and "communication" and their derivatives cover direct and indirect communication. The terms "include" and "comprise" and their derivatives mean including but not limited to this. The term "or" is inclusive, meaning and / or. The phrase "associated with..." and its derivatives mean including, included, interconnected with..., including, included, connected to or connected with..., coupled to or coupled with..., communicable with..., collaborate with..., interweave, juxtapose, close to, bound to or bound with..., have, have the property of..., have a relationship to or with..., etc. The term "controller" means any device, system or part thereof that controls at least one operation. Such a controller can be implemented with hardware or a combination of hardware and software and / or firmware. The functions associated with any particular controller can be centralized or distributed, whether local or remote. When used with a list of items, the phrase "at least one of" means that different combinations of one or more of the listed items may be used, and only one of the items in the list may be required. For example, "at least one of A, B, and C" includes any combination of: A, B, C, A and B, A and C, B and C, and A, B, and C.

[0081] In addition, the various functions described below can be implemented or supported by one or more computer programs, each of which is formed by a computer-readable program code and embodied in a computer-readable medium. The terms "application" and "program" refer to one or more computer programs, software components, instruction sets, processes, functions, objects, classes, instances, related data or parts thereof suitable for implementation in a suitable computer-readable program code. The phrase "computer-readable program code" includes any type of computer code, including source code, object code and executable code. The phrase "computer-readable medium" includes any type of medium that can be accessed by a computer, such as a read-only memory (ROM), a random access memory (RAM), a hard drive, a compact disk (CD), a digital video disk (DVD) or any other type of memory. "Non-transitory" computer-readable media does not include wired, wireless, optical or other communication links that transmit temporary electrical signals or other signals. Non-transitory computer-readable media include media that can permanently store data and media that can store data and overwrite it later, such as rewritable optical disks or erasable memory devices.

[0082] Definitions for certain other words and phrases are provided throughout this patent document. Those of ordinary skill in the art should understand that in many, if not most instances, such definitions apply to prior and future uses of such defined words and phrases.

[0083]

Invention Mode

[0084] Discussed below Figures 1 to 37 The various embodiments used to describe the principles of the present disclosure in this patent document are merely exemplary and should not be interpreted as limiting the scope of the present disclosure in any way. Those skilled in the art will appreciate that the principles of the present disclosure can be implemented in any appropriately arranged system or device.

[0085] The following documents are incorporated herein by reference into the present disclosure as if fully set forth herein: 3GPP TS 38.211 v15.4.0, “NR; Physical channels and modulation”; 3GPP TS 38.212 v15.4.0, “NR; Multiplexing and Channel coding”; 3GPP TS 38.213 v15.4.0, “NR; Physical Layer Procedures for Control”; 3GPP TS 38.214 v15.4.0, “NR; Physical Layer Procedures for Data”; 3GPP TS 38.331 v15.4.0, “NR; Radio Resource Control (RRC) Protocol Specification”; ETSI EN 301 893 V2.1.1, “5 GHz RLAN; Harmonized Standard covering the essential requirements of article 3.2 of Directive 2014 / 53 / EU”, 2017; ETSI EN 302 567 V2.1 1, "Multiple-Gigabit / s radio equipment operating in the 60 GHz band; Harmonized Standard covering the essential requirements of article 3.2 of Directive 2014 / 53 / EU", 2017; 3GPP TR 36.889 V13.0.0, "Study onLicensed-Assisted Access to Unlicensed Spectrum", 2015; and IEEE Standard 802.11-2016, "Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications", 2016.

[0086] The following Figure 1-Figure 3 Various embodiments are described that are implemented in a wireless communication system and use orthogonal frequency division multiplexing (OFDM) or orthogonal frequency division multiple access (OFDMA) communication techniques. Figure 1-Figure 3The description is not meant to imply physical or architectural limitations to the manner in which different embodiments may be implemented. Different embodiments of the present disclosure may be implemented in any suitably arranged communications system.

[0087] Figure 1 An example wireless network according to an embodiment of the present disclosure is shown. Figure 1 The embodiment of the wireless network shown is for illustration only. Other embodiments of the wireless network 100 may be used without departing from the scope of the present disclosure.

[0088] like Figure 1 As shown, the wireless network may include gNB 101, gNB 102, and gNB 103. gNB 101 may communicate with gNB 102 and gNB 103. gNB 101 may also communicate with at least one network 130, such as the Internet, a proprietary Internet Protocol (IP) network, or other data network.

[0089] gNB 102 may provide wireless broadband access to network 130 for a first plurality of user equipment (UE) within coverage area 120 of gNB 102. The first plurality of UEs may include: UE 111, which may be located in a small business (SB); UE 112, which may be located in an enterprise (E); UE 113, which may be located in a WiFi hotspot (HS); UE 114, which may be located in a first residence (R); UE 115, which may be located in a second residence (R); and UE 116, which may be a mobile device (M) such as a cellular phone, a wireless laptop, a wireless PDA, etc. gNB 103 may provide wireless broadband access to network 130 for a second plurality of UEs within coverage area 125 of gNB 103. The second plurality of UEs may include UE 115 and UE 116. In some embodiments, one or more of gNBs 101-103 may communicate with each other and with UEs 111-116 using 5G, LTE, LTE-A, WiMAX, WiFi, or other wireless communication technologies.

[0090] Depending on the network type, the term "base station" or "BS" may refer to any component (or set of components) configured to provide wireless access to a network, such as a transmission point (TP), a transmission-reception point (TRP), an enhanced base station (eNodeB or eNB), a 5G base station (gNB), a macro cell, a femto cell, a WiFi access point (AP), or other wireless-enabled devices. A base station may provide wireless access according to one or more wireless communication protocols (e.g., 5G 3GPP New Radio Interface / Access (NR), Long Term Evolution (LTE), Advanced LTE (LTE-A), High Speed ​​Packet Access (HSPA), Wi-Fi 802.11a / b / g / n / ac, etc.). For convenience, the terms "BS" and "TRP" are used interchangeably in this disclosure to refer to a network infrastructure component that provides wireless access to a remote terminal. In addition, depending on the network type, the term "user equipment" or "UE" may refer to any component, such as a "mobile station", "subscriber station", "remote terminal", "wireless terminal", "reception point", or "user device". For convenience, the terms "user equipment" and "UE" are used in this disclosure to refer to a remote wireless device that wirelessly accesses a BS, whether the UE is a mobile device (such as a mobile phone or smartphone) or is generally considered a fixed device (such as a desktop computer or vending machine).

[0091] Dashed lines illustrate the approximate extents of coverage areas 120 and 125, which are shown as generally circular for purposes of illustration and explanation only. It should be clearly understood that coverage areas associated with a gNB, such as coverage areas 120 and 125, may have other shapes, including irregular shapes, depending on the configuration of the gNB and variations in the radio environment associated with natural and man-made obstacles.

[0092] As described in more detail below, one or more of the UEs 111-116 include circuitry, programming, or a combination thereof, for reliability of reception of data and control information in an advanced wireless communication system. In certain embodiments, one or more of the gNBs 101-103 include circuitry, programming, or a combination thereof, for efficient channel occupancy time sharing in NR unlicensed.

[0093] although Figure 1 An example of a wireless network is shown, but Figure 1Various changes may be made. For example, the wireless network may include any number of gNBs and any number of UEs in any suitable arrangement. In addition, gNB 101 may communicate directly with any number of UEs and provide wireless broadband access to network 130 to these UEs. Similarly, each gNB 102-103 may communicate directly with network 130 and provide direct wireless broadband access to network 130 to the UEs. In addition, gNBs 101, 102, and / or 103 may provide access to other or additional external networks, such as an external telephone network or other type of data network.

[0094] Figure 2 An example gNB 102 is shown according to an embodiment of the present disclosure. Figure 2 The embodiment of gNB 102 shown is for illustration only, and Figure 1 gNBs 101 and 103 may have the same or similar configurations. However, gNBs have a variety of configurations, and Figure 2 There is no intent to limit the scope of the present disclosure to any particular implementation of the gNB.

[0095] like Figure 2 As shown, gNB 102 may include multiple antennas 205a-205n, multiple RF transceivers 210a-210n, transmit (TX) processing circuitry 215, and receive (RX) processing circuitry 220. gNB 102 may also include a controller / processor 225, a memory 230, and a backhaul or network interface 235.

[0096] The RF transceivers 210a-210n may receive incoming RF signals from the antennas 205a-205n, such as signals transmitted by UEs in the network 100. The RF transceivers 210a-210n may down-convert the incoming RF signals to generate IF or baseband signals. The IF or baseband signals may be transmitted to the RX processing circuit 220, which may generate processed baseband signals by filtering, decoding, and / or digitizing the baseband or IF signals. The RX processing circuit 220 may send the processed baseband signals to the controller / processor 225 for further processing.

[0097] The TX processing circuit 215 may receive analog or digital data (such as voice data, network data, email, or interactive video game data) from the controller / processor 225. The TX processing circuit 215 may encode, multiplex, and / or digitize the outgoing baseband data to generate a processed baseband or IF signal. The RF transceivers 210a-210n may receive the outgoing processed baseband or IF signals from the TX processing circuit 215 and up-convert the baseband or IF signals to RF signals that are transmitted via the antennas 205a-205n.

[0098] The controller / processor 225 may include one or more processors or other processing devices that control the overall operation of the gNB 102. For example, the controller / processor 225 may control the reception of forward channel signals and the transmission of reverse channel signals via the RF transceivers 210a-210n, the RX processing circuitry 220, and the TX processing circuitry 215 in accordance with well-known principles. The controller / processor 225 may also support additional functionality, such as more advanced wireless communication functionality. For example, the controller / processor 225 may support beamforming or directional routing operations, in which transmitted signals from multiple antennas 205a-205n are weighted differently to effectively direct the transmitted signals in a desired direction. The controller / processor 225 may support any of a variety of other functions in the gNB 102.

[0099] Controller / processor 225 is also capable of executing programs and other processes, such as an OS, that reside in memory 230. Controller / processor 225 may move data into or out of memory 230 as needed to execute a process.

[0100] The controller / processor 225 is also coupled to a backhaul or network interface 235. The backhaul or network interface 235 allows the gNB 102 to communicate with other devices or systems via a backhaul connection or network. The interface 235 can support communication via any suitable one (or more) wired or wireless connections. For example, when the gNB 102 is implemented as part of a cellular communication system (such as a cellular communication system supporting 5G, LTE, or LTE-A), the interface 235 can allow the gNB 102 to communicate with other gNBs via a wired or wireless backhaul connection. When the gNB 102 is implemented as an access point, the interface 235 can allow the gNB 102 to communicate via a wired or wireless local area network or via a wired or wireless connection to a larger network (such as the Internet). The interface 235 includes any suitable structure that supports communication via a wired or wireless connection, such as an Ethernet or RF transceiver.

[0101] Memory 230 is coupled to controller / processor 225. A portion of memory 230 may include RAM, and another portion of memory 230 may include flash memory or other ROM.

[0102] although Figure 2 An example of a gNB 102 is shown, but the Figure 2 For example, gNB 102 may include any number of Figure 2As a specific example, the access point may include multiple interfaces 235, and the controller / processor 225 may support routing functions to route data between different network addresses. As another specific example, although shown as including a single instance of TX processing circuitry 215 and a single instance of RX processing circuitry 220, the gNB 102 may include multiple instances of each (such as one instance per RF transceiver). In addition, Figure 2 The various components in may be combined, further subdivided, or omitted, and additional components may be added according to specific needs.

[0103] Figure 3 An example UE 116 is shown according to an embodiment of the disclosure. Figure 3 The embodiment of UE 116 shown is for illustration only, and Figure 1 UEs 111-115 may have the same or similar configurations. However, UEs have a variety of configurations, and Figure 3 The scope of the present disclosure is not limited to any particular implementation of the UE.

[0104] like Figure 3 As shown, UE 116 may include antenna 305, radio frequency (RF) transceiver 310, TX processing circuit 315, microphone 320, and receive (RX) processing circuit 325. UE 116 may also include speaker 330, processor 340, input / output (I / O) interface (IF) 345, touch screen 350, display 355, and memory 360. Memory 360 includes operating system (OS) 361 and one or more applications 362.

[0105] RF transceiver 310 may receive incoming RF signals from antenna 305 transmitted by a gNB of network 100. RF transceiver 310 may down-convert the outgoing RF signals to generate an intermediate frequency (IF) or baseband signal. The IF or baseband signal may be transmitted to RX processing circuitry 325, which generates a processed baseband signal by filtering, decoding, and / or digitizing the baseband or IF signal. RX processing circuitry 325 may transmit the processed baseband signal to speaker 330 (such as for voice data), or processor 340 for further processing (such as for web browsing data).

[0106] The TX processing circuitry may receive analog or digital voice data from microphone 320, or other outgoing baseband data (such as network data, email, or interactive video game data) from processor 340. TX processing circuitry 315 may encode, multiplex, and / or digitize the outgoing baseband data to generate a processed baseband or IF signal. RF transceiver 310 may receive the outgoing processed baseband or IF signal from TX processing circuitry 315, and up-convert the baseband or IF signal to an RF signal that is transmitted via antenna 305.

[0107] The processor 340 may include one or more processors or other processing devices and execute the OS 361 stored in the memory 360 to control the overall operation of the UE 116. For example, the processor 340 may control the reception of forward channel signals and the transmission of reverse channel signals through the RF transceiver 310, the RX processing circuit 325, and the TX processing circuit 315 according to well-known principles. In some embodiments, the processor 340 includes at least one microprocessor or microcontroller.

[0108] The processor 340 is also capable of executing other processes and programs resident in the memory 360, such as processes for beam management. The processor 340 can move data into or out of the memory 360 as needed to perform the processing. In some embodiments, the processor 340 is configured to execute the application 362 based on the OS 361 or in response to a signal received from the gNB or operator. The processor 340 is also coupled to the I / O interface 345, which provides the UE 116 with the ability to connect to other devices such as laptops and handheld computers. The I / O interface 345 is the communication path between these accessories and the processor 340.

[0109] Processor 340 is also coupled to touch screen 350 and display 355. An operator of UE 116 may enter data into UE 116 using touch screen 350. Display 355 may be a liquid crystal display, light emitting diode display, or other display capable of presenting text (such as from a website) and / or at least limited graphics.

[0110] Memory 360 is coupled to processor 340. A portion of memory 360 may include random access memory (RAM), and another portion of memory 360 may include flash memory or other read-only memory (ROM).

[0111] although Figure 3 An example of UE 116 is shown, but the Figure 3 Make various changes. For example, Figure 3The various components in the embodiment may be combined, further subdivided, or omitted, and additional components may be added according to specific needs. As a specific example, processor 340 may be divided into multiple processors, such as one or more central processing units (CPUs) and one or more graphics processing units (GPUs). In addition, although Figure 3 The UE 116 is shown configured as a mobile phone or smart phone, but the UE may be configured to operate as other types of mobile or stationary devices.

[0112] The present disclosure relates generally to wireless communication systems, and more particularly to reducing power consumption of a user equipment (UE) communicating with a base station, and to transmitting a physical downlink control channel (PDCCH) to the UE and receiving the PDCCH from the UE for dual connectivity operation. The communication system includes a downlink (DL) and an uplink (UL), wherein the DL refers to transmission from a base station or one or more transmission points to the UE, and the UL refers to transmission from the UE to the base station or one or more reception points.

[0113] In order to meet the demand for increased wireless data traffic since the deployment of 4G communication systems, efforts have been made to develop improved 5G or pre-5G communication systems. Therefore, 5G or pre-5G communication systems are also called "super 4G networks" or "post-LTE systems". 5G communication systems are considered to be implemented in higher frequency (millimeter wave) bands (e.g., 60GHz bands) to achieve higher data rates. In order to reduce the propagation loss of radio waves and increase the transmission distance, technologies such as beamforming, massive multiple input multiple output (MIMO), full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and massive antennas are discussed in 5G communication systems. In addition, in 5G communication systems, development of system network improvements is underway based on advanced small cells, cloud radio access networks (RANs), ultra-dense networks, device-to-device (D2D) communications, wireless backhaul, mobile networks, collaborative communications, coordinated multipoints (CoMP), receiving-end interference elimination, etc.

[0114] The time unit used for DL ​​signaling or UL signaling on a cell is called a time slot and may include one or more symbols. A symbol may also be used as an additional time unit. A frequency (or bandwidth (BW)) unit is called a resource block (RB). An RB may include multiple subcarriers (SCs). For example, a time slot may include 14 symbols with a duration of 1 ms or 0.5 ms, and an RB may have a BW of 180 kHz or 360 kHz and include 12 SCs with an inter-SC spacing of 15 kHz or 30 kHz, respectively.

[0115] DL signals include data signals that convey information content, control signals that convey DL control information (DCI) formats, and reference signals (RS), also known as pilot signals. The gNB can send data information (e.g., transport blocks) or DCI formats through the corresponding physical DL shared channel (PDSCH) or physical DL control channel (PDCCH). The gNB can send one or more of multiple types of RS, including channel state information RS (CSI-RS) and demodulation RS (DMRS). CSI-RS may be intended for UEs to measure channel state information (CSI) or perform other measurements, such as measurements related to mobility support. DMRS can only be sent in the BW of the corresponding PDCCH or PDSCH, and the UE can use DMRS to demodulate data or control information.

[0116] The UL signal may also include a data signal conveying information content, a control signal conveying UL control information (UCI), and an RS. The UE may send data information (e.g., a transport block) or UCI through a corresponding physical UL shared channel (PUSCH) or a physical UL control channel (PUCCH). When the UE sends data information and UCI simultaneously, the UE may multiplex them in the PUSCH or send them separately in the corresponding PUSCH and PUCCH. The UCI may include hybrid automatic repeat request acknowledgement (HARQ-ACK) information indicating correct or incorrect detection of a data transport block by the UE, a scheduling request indicating whether the UE has data in the UE's buffer, and a CSI report that enables the gNB to select appropriate parameters to perform link adaptation for the UE's PDSCH or PDCCH transmission.

[0117] The CSI report from the UE may include a channel quality indicator (CQI), a precoding matrix indicator (PMI), and a rank indicator (RI), where the CQI informs the gNB of the modulation and coding scheme (MCS) for the UE to detect data TBs with a predetermined block error rate (BLER) (such as a BLER of 10%), the PMI informs the gNB how to precode the signaling to the UE, and the RI indicates the transmission rank used for the PDSCH. The UL RS may include a DMRS and a sounding RS (SRS). The DMRS is transmitted only in the BW of the corresponding PUSCH or PUSCH transmission. The gNB may use the DMRS to demodulate the information in the corresponding PUSCH or PUSCH. The UE may transmit the SRS to provide the gNB with UL CSI and, for TDD or flexible duplex systems, may also provide the PMI for DL ​​transmissions. The UL DMRS or SRS transmission may be based on, for example, the transmission of a Zadoff_Chu (ZC) sequence, or generally based on the transmission of a constant amplitude zero autocorrelation (CAZAC) sequence.

[0118] DL and UL transmissions may be based on orthogonal frequency division multiplexing (OFDM) waveforms, including the use of a variation of DFT precoding known as DFT-spread OFDM.

[0119] Figure 4 An example transmitter structure 400 using OFDM according to an embodiment of the disclosure is shown. Figure 4 The illustrated embodiment of transmitter structure 400 is for illustration only. Figure 4 One or more of the components shown may be implemented in dedicated circuits configured to perform the functions described, or one or more of the components may be implemented by one or more processors executing instructions to perform the functions described. Other embodiments may be used without departing from the scope of the present disclosure.

[0120] Information bits, such as DCI bits or data bits 410, may be encoded by an encoder 420, rate matched to a specified time / frequency resource by a rate matcher 430, and modulated by a modulator 440. Subsequently, the modulated coded symbols and DMRS or CSI-RS 450 may be mapped to an SC 460 by an SC mapping circuit 465, an inverse fast Fourier transform (IFFT) may be performed by a filter 470, a cyclic prefix (CP) may be added by a CP insertion circuit 480, and the resulting signal may be filtered by a filter 490 and transmitted by a radio frequency (RF) circuit 495.

[0121] Figure 5 An example receiver structure 500 using OFDM according to an embodiment of the disclosure is shown. Figure 5 The illustrated embodiment of receiver structure 500 is for illustration only. Figure 5 One or more of the components shown may be implemented in dedicated circuits configured to perform the functions described, or one or more of the components may be implemented by one or more processors executing instructions to perform the functions described. Other embodiments may be used without departing from the scope of the present disclosure.

[0122] The received signal 510 can be filtered by filter 520, the CP removal circuit can remove the CP 530, the filter 540 can apply a fast Fourier transform (FFT), the SC demapping circuit 550 can demap the SC selected by the BW selector circuit 555, the received symbols can be demodulated by the channel estimator and demodulator circuit 560, the rate dematcher 570 can restore the rate matching, and the decoder 580 can decode the resulting bits to provide information bits 590.

[0123] The UE may typically monitor multiple candidate locations for corresponding potential PDCCH transmissions to decode multiple candidate DCI formats in a time slot. Monitoring PDCCH candidates may mean receiving and decoding PDCCH candidates according to the DCI format that the UE is configured to receive. The DCI format may include cyclic redundancy check (CRC) bits so that the UE confirms the correct detection of the DCI format. The DCI format type may be identified by a radio network temporary identifier (RNTI) scrambled with the CRC bits. For DCI formats scheduled to PDSCH or PUSCH for a single UE, the RNTI may be a cell RNTI (C-RNTI) and used as a UE identifier.

[0124] For a DCI format that schedules a PDSCH that conveys system information (SI), the RNTI may be an SI-RNTI. For a DCI format that schedules a PDSCH that provides a random access response (RAR), the RNTI may be an RA-RNTI. For a DCI format that schedules a PDSCH or PUSCH to a single UE before the UE establishes a radio resource control (RRC) connection with the serving gNB, the RNTI may be a temporary C-RNTI (TC-RNTI). For a DCI format that provides TPC commands to a group of UEs, the RNTI may be a TPC-PUSCH-RNTI or a TPC-PUSCH-RNTI. Each RNTI type may be configured to the UE via higher layer signaling, such as RRC signaling. A DCI format that schedules PDSCH transmissions to a UE is also referred to as a DL DCI format or DL ​​designation, while a DCI format that schedules PUSCH transmissions from a UE is also referred to as an UL DCI format or UL grant.

[0125] The PDCCH transmission may be within a set of physical RBs (PRBs). The gNB may configure one or more PRB sets, also referred to as control resource sets, for the UE for PDCCH reception. The PDCCH transmission may be within a control channel element (CCE) included in the control resource set. The UE may determine the CCEs for PDCCH reception based on a search space, such as a UE-specific search space (USS) for PDCCH candidates with a DCI format having a CRC scrambled by an RNTI (such as a C-RNTI) configured to the UE via UE-specific RRC signaling for scheduling PDSCH reception or PUSCH transmission, and a common search space (CSS) for PDCCH candidates with a DCI format having a CRC scrambled by other RNTIs. The set of CCEs that may be used for PDCCH transmission to the UE defines the PDCCH candidate locations. An attribute of the control resource set may be a transmit configuration indication (TCI) state that provides quasi-co-location information of DMRS antenna ports for PDCCH reception.

[0126] Figure 6 An example encoding process 600 for a DCI format according to an embodiment of the disclosure is shown. Figure 6 The illustrated embodiment of encoding process 600 is for illustration only. Figure 6 One or more of the components shown may be implemented in dedicated circuits configured to perform the functions described, or one or more of the components may be implemented by one or more processors executing instructions to perform the functions described. Other embodiments may be used without departing from the scope of the present disclosure.

[0127] The gNB may encode and transmit each DCI format separately in the corresponding PDCCH. The RNTI may mask the CRC of the DCI format codeword to enable the UE to identify the DCI format. For example, the CRC and RNTI may include, for example, 16 bits or 24 bits. The CRC of the (uncoded) DCI format bits 610 may be determined using a CRC calculation circuit 620, and the CRC may be masked using an exclusive OR (XOR) operation circuit 630 between the CRC bits and the RNTI bits 640. The XOR operation is defined as XOR(0,0)=0, XOR(0,1)=1, XOR(1,0)=1, XOR(1,1)=0. The masked CRC bits may be appended to the DCI format information bits using a CRC append circuit 650. The encoder 660 may perform channel coding (such as tail-biting convolutional coding or polar coding), followed by rate matching to the allocated resources by a rate matcher 670. The interleaving and modulation circuit 680 may apply interleaving and modulation, such as QPSK, and may transmit an output control signal 690.

[0128] Figure 7 An example decoding process 700 of a DCI format for use with a UE according to an embodiment of the disclosure is shown. Figure 7 The illustrated embodiment of decoding process 700 is for illustration only. Figure 7 One or more of the components shown may be implemented in dedicated circuits configured to perform the functions described, or one or more of the components may be implemented by one or more processors executing instructions to perform the functions described. Other embodiments may be used without departing from the scope of the present disclosure.

[0129] The received control signal 710 may be demodulated and deinterleaved by a demodulator and deinterleaver 720. A rate matcher 730 may recover the rate matching applied at the gNB transmitter, and a decoder 740 may decode the resulting bits. After decoding, a CRC extractor 750 may extract the CRC bits and provide DCI format information bits 760. The DCI format information bits may be unmasked 770 by an XOR operation with the RNTI 780 (when applicable), and a CRC check may be performed by circuit 790. When the CRC check is successful (checksum is zero), the DCI format information bits may be considered valid. When the CRC check is not successful, the DCI format information bits may be considered invalid.

[0130] Figure 8 An example channel access procedure 800 is shown according to an embodiment of the present disclosure. Figure 8 The illustrated embodiment of the channel access procedure 800 is for illustration only. Figure 8 The scope of the present disclosure is not limited.

[0131] In the 3GPP standard specification, downlink transmission including the physical downlink shared channel (PDSCH) on the LAA (licensed assisted access) carrier follows the Category 4 Listen Before Talk (Cat4 LBT) procedure ( Figure 8). The eNB is first in the IDLE state (801). Depending on whether there is data traffic (811), the gNB transitions to the CONTEND state (802) or to the IDLE state (801), respectively. The eNB first performs an initial CCA (iCCA), in which the eNB senses the channel for a slot duration of the deferral duration (812). If the channel is sensed as clear in the iCCA, the gNB starts transmitting (803); otherwise, the gNB generates a backoff (BO) counter (821) and performs an extended CCA (eCCA). The eNB may start transmitting after the BO counter reaches 0 (814), as in step 4), wherein the BO counter is adjusted by sensing the channel during (multiple) additional time slot durations according to the following steps: 1) setting the counter to a random number uniformly distributed between 0 and the contention window size (CWS) (821), and going to step 4; 2) if the counter is greater than 0 and the eNB chooses to decrement the counter, decrementing the counter by 1 (822); 3) sensing the channel during the additional time slot duration, and if the additional time slot duration is idle, go to step 4); otherwise, go to step 5); 4) if the counter is 0 (814), stop; otherwise, go to step 2). 5) sensing the channel until a busy slot is detected within the additional deferral duration or all time slots of the additional deferral duration are detected as idle (815); 6) if the channel is detected as idle during all time slot durations of the additional deferral duration, go to step 4); otherwise, go to step 5).

[0132] The eNB may continue to transmit until the maximum channel occupancy is reached (818). After transmitting, if the transmission is successful, the contention window size may be reset (823); otherwise, the contention window size may be increased (824). If the eNB still has data traffic after transmitting (817), the eNB may continue to contend for the channel (802); otherwise, the eNB may transfer to idle (801). If the eNB did not have any previous iCCA failures (816), the eNB may perform an iCCA (812); otherwise, the gNB should generate a BO counter (821) and perform an eCCA (813).

[0133] In the LTE-LAA standard specification, for transmissions including the physical downlink shared channel (PDSCH), or the physical downlink control channel (PDCCH), or the enhanced physical downlink control channel (EPDCCH), the channel access mechanism is based on LBE, which is also called Category-4 (CAT-4) LBT. Specifically, the LTE-LAA eNB can transmit after sensing that the channel is idle during the time slot duration of the postponement duration; and transmit after the backoff counter (BO) is zero in step 4. An example of such a channel access process is as follows Figure 8 As shown (for example, for this type of channel access procedure, it is also called Cat4 LBT).

[0134] The backoff counter is adjusted by sensing the channel during (multiple) additional time slot durations according to the following steps: (1) set the counter to a random number uniformly distributed between 0 and the contention window (CW) value, and go to step 4; (2) if the counter is greater than 0 and the eNB chooses to decrement the counter, decrement the counter by 1; (3) sense the channel during the additional time slot duration, and if the additional time slot duration is idle, go to step 4; otherwise, go to step 5; (4) if the counter is 0, stop; otherwise, go to step 2; (5) sense the channel until a busy slot is detected within the additional deferral duration or all time slots of the additional deferral duration are detected as idle; and (6) if the channel is sensed as idle during all time slot durations of the additional deferral duration, go to step 4); otherwise, go to step 5.

[0135] In addition, for LTE-LAA, after the channel is sensed to be idle within a fixed observation interval of at least 25μs, and if the duration of the transmission is less than 1ms, a DL transmission burst containing a discovery reference signal (DRS) without PDSCH can be sent. This LBT operation with a fixed sensing interval is also called Cat2 LBT.

[0136] In the NR standard specification, each synchronization and PBCH signal block (SS / PBCH block) consists of one symbol of PSS, two symbols of PBCH, and one symbol of SSS and PBCH, where the four symbols are continuously mapped and time-division multiplexed.

[0137] For initial cell selection of an NR cell, the UE may assume a default SS burst set period of 20ms, and in order to detect non-independent NR cells, the network may provide the UE with one SS burst set period information per frequency carrier and, if possible, information for deriving measurement timing / duration. In addition to the MIB, the remaining minimum system information (RMSI) may be carried by the physical downlink shared channel (PDSCH), and scheduling information may be carried by the corresponding physical downlink control channel (PDCCH). Similar structures may apply to other system information (OSI) and paging messages. A control resource set (CORESET) for receiving common control channels, such as RMSI, may be configured in the content of the PBCH.

[0138] In NR-U, the transmission of SS / PBCH blocks may also be affected by the sensing results of LBT, so that the UE cannot always expect to receive SS / PBCH blocks periodically. In order to resolve the LBT uncertainty of SS / PBCH block transmission in NR-U, discovery reference signals and channels (which may be referred to as DRS in the rest of this disclosure) may be supported for NR-U. DRS may include (multiple) SS / PBCH blocks, as well as (multiple) configurable CORESETs and (multiple) PDSCHs for RMSI, OSI, or paging, and a configurable channel state indicator reference signal (CSI-RS).

[0139] In addition, for the transmission of SS / PBCH blocks in NR-U DRS, a DRS Transmission Timing Configuration (DTTC) method can be considered for NR-U, where the configuration includes a window period, a window duration, and a window offset. DRS can be subjected to a single-shot LBT of a fixed duration (e.g., 25 μs for FR1 NR-U).

[0140] In the NR standard specification, after detecting the SS / PBCH block, the UE can obtain the configuration of the physical random access channel (PRACH) resources in the time domain and frequency domain, the PRACH format, and the parameters for determining the PRACH preamble sequence through the remaining system information (RMSI) or the equivalent system information block (SIB1). In addition, the number N of SS / PBCH blocks associated with a valid RACH opportunity (RO) can be provided to the UE by the higher layer (e.g., via RRC), and the UE can derive the (multiple) relevant ROs for PRACH transmission based on this association and the time / frequency resource configuration for PRACH.

[0141] Given the requirement for LBT, it may not be guaranteed that the NR-U UE has channel access to transmit PRACH at the RACH occasions configured by higher layers (e.g., RRC), thereby potentially increasing the overall random access delay and reducing PRACH resource utilization. To reduce the overall random access delay, a higher priority LBT (e.g., single LBT) subject to specified allowances may be assigned to the NR-U PRACH, or additional RACH occasions may be configured in addition to the RACH occasions configured via the PRACH configuration table (as shown in the NR standard specification).

[0142] In addition to the LBT requirements, the ETSI BRAN (Broadband Radio Access Network) regulations also require that the occupied channel bandwidth (OCB) of unlicensed signals occupy at least 80% of the nominal channel bandwidth. During the COT (Channel Occupancy Time), unlicensed devices can temporarily operate with an OCB of less than 80% of the nominal channel bandwidth and a minimum of 2MHz.

[0143] The NR standard specification PRACH short preamble format has a PRACH sequence length of 139 and a subcarrier spacing of 15kHz or 30kHz for FR1 NR, which is less than 80% of the 20MHz nominal channel bandwidth in the 5GHz unlicensed band. To meet the OCB regulation, the frequency resource mapping for FR1 NR-U PRACH can be extended from the NR standard specification PRACH to support wideband NR-U PRACH through one of the following examples.

[0144] In one example, a single long PRACH sequence may be introduced into FR1 NR-U such that the long PRACH sequence may be longer than the legacy Rel-15 PRACH sequence length of 139. For example, the long PRACH sequence may span at least 80% of the nominal unlicensed channel bandwidth. The length of the single long PRACH sequence may depend on the subcarrier spacing (SCS) of the PRACH.

[0145] In one example, the NR standard specifies that short PRACH preamble sequences may be repeated in the frequency domain such that these repeated PRACH sequences may occupy at least 80% of the 20 MHz nominal unlicensed channel bandwidth. The repeated PRACH preamble sequences in the frequency domain may have different frequency offsets and / or cyclic shifts to reduce the peak-to-average power ratio (PAPR). The repeated PRACH sequences may be specified for NR-U UEs within the nominal channel bandwidth for PRACH transmissions.

[0146] The foregoing embodiments and / or examples of wideband NR-U PRACH transmission will require enhancements to the NR standard specification. The present disclosure focuses on enhancements to the NR standard specification to support wideband PRACH for FR1 NR-U, including configuration of a single wideband PRACH sequence for NR-U and configuration of frequency-repeated NR standard specification PRACH for NR-U

[0147] The present disclosure includes several embodiments, principles, methods and examples that can be used in conjunction with or in combination with each other or can be operated independently. The embodiments / principles / methods / examples in the present disclosure can be applied to FBE-based NR-U, LBE-based NR-U, or both FBE-based and LBE-based NR-U.

[0148] In the present disclosure, FR1 NR-U refers to NR-U operating in an unlicensed / shared band (such as a 5 GHz unlicensed band or a 6 GHz unlicensed / shared band) in FR1; and FR2 GHz NR-U refers to NR-U operating in an unlicensed / shared band (such as a 60 GHz unlicensed band) in FR2.

[0149] In one embodiment, a configuration for a single long wideband PRACH is provided.

[0150] In such an embodiment, methods and means are provided to configure a single long wideband PRACH sequence that occupies at least 80% of the nominal channel bandwidth of the unlicensed spectrum. In such an embodiment, methods and means are provided to configure a single long wideband PRACH sequence.

[0151] In one example, the length of a single long PRACH sequence is L RA can be chosen so that 12*(M-1) <L RA The largest prime number < 12*M, where M is M=2 α ×3 β ×5 γ The number of RBs that contain a single long PRACH sequence in the case of .

[0152] In one example, the single long wideband PRACH sequence may be a Zadoff-Chu (ZC) based sequence.

[0153] In one example, the length of a single long wideband PRACH sequence may depend on the NR-U PRACH subcarrier spacing, and the sequence length may decrease as the PRACH SCS increases.

[0154] In one example, the length of a single long wideband PRACH sequence may be fixed regardless of the NR-U PRACH subcarrier spacing.

[0155] In one example, when M=96, L RA It can be 1151. For example, this can be applied to NR-U PRACH with 15kHz SCS.

[0156] In one example, when M=48, L RA It can be 571. For example, this can be applied to NR-U PRACH with 30kHz SCS. In another example, this can be applied to NR-U PRACH with 15kHz SCS.

[0157] In one example, when M=24, L RA It can be 283. For example, this can be applied to NR-U PRACH with 60kHz SCS. In another example, this can be applied to NR-U PRACH with 30kHz SCS. In yet another example, this can be applied to NR-U PRACH with 15kHz SCS.

[0158] In one example, the PRACH subcarrier spacing for a single long wideband PRACH sequence can be derived from the msg1-SubcarrierSpacing field from the RRC information element (IE) RACH-ConfigCommon; or if this field is not present, the UE can apply the SCS derived from the PRACH configuration table, such as when the number of PRACH time slots in a subframe is configured as 2 in the PRACH configuration table, the PRACH SCS is 30kHz.

[0159] In one example, the number M of RBs containing a single long PRACH sequence may be selected such that the single long PRACH sequence spans at least 80% of the nominal channel bandwidth.

[0160] In one example, the number M of RBs containing a single long PRACH sequence may be selected as a fixed number regardless of the subcarrier spacing.

[0161] In one sub-example, for a given subcarrier spacing, there may be only one long PRACH sequence within each nominal channel bandwidth.

[0162] In another sub-example, for a given subcarrier spacing, there may be an integer multiple (N) of long PRACH sequences, each with M RBs, such that the N*M RBs span at least 80% of the nominal channel bandwidth.

[0163] In another sub-example, N long PRACH sequences may be frequency division multiplexed (FDM) in the frequency domain, with each long PRACH sequence occupying M RBs.

[0164] In another sub-example, N repetitions of a long PRACH sequence may be frequency division multiplexed in the frequency domain, where each long PRACH sequence occupies M RBs. For example, repetitions of different long PRACH sequences may be configured by the following embodiments and / or examples.

[0165] In another sub-example, the same M value can be applied to different PRACH subcarrier spacings, and integer multiples of N values ​​of the long PRACH sequence can be multiplexed in the frequency domain, where N is scalable with respect to the subcarrier spacing. For example, in the case of M=48, where L RA can be 571, for a PRACH subcarrier spacing of 30 kHz, N can be 1, and for a PRACH subcarrier spacing of 15 kHz, N can be 2, where the nominal channel bandwidth is 20 MHz. In another example, where M=24, where L RA It can be 283, for a PRACH subcarrier spacing of 60kHz, N can be 1, and for a PRACH subcarrier spacing of 30kHz, N can be 2, and for a PRACH subcarrier spacing of 15kHz, N can be 4, where the nominal channel bandwidth is 20MHz.

[0166] In one example, the length of a single long wideband PRACH sequence may be explicitly or implicitly indicated by higher layer parameters.

[0167] In one example, the higher layer parameter may be residual system information (RMSI), which is sent via system information block 1 (SIB1). In one sub-example, this may be used to configure the length of a single long wideband PRACH sequence for an initial access UE in an initial active UL BWP.

[0168] In one example, the higher layer parameter may be an RRC information element (IE) RACH-ConfigCommon, which may be used for NR-U cell-specific random access. In one sub-example, the higher layer parameter may be used for random access of a networked UE on an active UL BWP. In one sub-example, the higher layer parameter may be used to configure the length of a single long wideband PRACH sequence for an initial access UE in an initial active UL BWP.

[0169] In one example, the higher layer parameter may be an RRC information element (IE) RACH-ConfigDedicated, which may be used for dedicated UE-specific random access.

[0170] In one example, higher layer parameters (eg, RRC information elements) may add an explicit field to configure the length of the PRACH sequence.

[0171] In one sub-example, the explicit field may be named prach-SequenceLength, which may be selected from a subset of values ​​of at least {1151,571,283,139}.

[0172] In one example, the length of a single long wideband PRACH sequence may be implicitly configured by the PRACH subcarrier spacing, and potentially without the use of an additional field indicating legacy NR standard specification PRACH.

[0173] In one sub-example, the PRACH subcarrier spacing may be derived from the msg1-SubcarrierSpacing field from the RRC IE; or if this field is not present, the UE applies the SCS derived from the PRACH configuration table.

[0174] In another sub-example, an additional field indicating whether the legacy NR standard specification PRACH is used may be configured and indicated via RRCIE (such as RACH-ConfigCommon).

[0175] In another sub-example, if the PRACH SCS is 15kHz and 30kHz respectively, the PRACH sequence lengths may be 1151 and 571, and an additional field indicates that the legacy NR standard specification PRACH is not used.

[0176] In one example, the length of a single long wideband PRACH sequence may be configured via prach-ConfigurationIndex in RACH-ConfigGeneric, where an additional column may be added to the PRACH configuration table to indicate the length of the PRACH sequence, and additional entries may be added or existing entries may be modified to indicate the use of a single long wideband PRACH sequence.

[0177] An illustration of the above example is provided in Table 1A and Table 1B, which provide a subset of the PRACH configuration table, which is modified to indicate the PRACH sequence length.

[0178] Table 1A PRACH configuration table

[0179]

[0180] Table 1B PRACH configuration table

[0181]

[0182] In one example, the length of a single long wideband PRACH sequence may be configured by an indication of whether a long PRACH sequence is used; if a long PRACH sequence is used, the sequence length may be one of fixed in the specification or configurable by higher layer parameters; and if a long PRACH sequence is not used, the sequence length may be determined by the NR standard specification process.

[0183] For example, if a long PRACH sequence is used, the long PRACH sequence may be fixed to 571, which may be used regardless of the PRACH subcarrier spacing.

[0184] In one example, the supported N values ​​that can be used to generate cyclic shift values ​​are CS Values ​​and indices from zeroCorrelationZoneConfg to N CS The corresponding mapping can be enhanced according to the NR standard specification to support a single long wideband PRACH sequence.

[0185] In one example, if N CS The number of desired cyclic shifts C generated by the value v is n (n≠0), then N CS The value of N is determined cs =floor(L RA / n).

[0186] In one example, different lengths of a single long wideband PRACH may be defined for a range from zeroCorrelationZonConfig to N CS A separate table for mappings.

[0187] In a sub-example, Tables 2 to 4 provide the following information when the length of a single long wideband PRACH sequence is L. RA Three examples when =1151.

[0188] For example, the examples in Table 2 to Table 4 may be applied to a PRACH SCS of 15 kHz.

[0189] In another example, the supported N CS The values ​​can be different from Table 2 to Table 4 for the supported N CS Select the value as long as N CS (Strictly) Increases as zeroCorrelationZoneConfig increases.

[0190] In another example, the supported N CS The values ​​can be different from Table 2 to Table 4 for the supported N CS values, and may also be selected from N not listed in Tables 2 to 4 CSThe value is selected (for example, N selected according to the above examples and / or embodiments) CS value); as long as N CS (Strictly) Increases as zeroCorrelationZoneConfig increases.

[0191] Table 2 Configuration values

[0192] zeroCorrelationZoneConfig Ncs value of the unconstrained set 0 0 1 16 2 33 3 50 4 67 5 88 6 104 7 115 8 127 9 143 10 164 11 191 12 230 13 287 14 383 15 575

[0193] Table 3 Configuration values

[0194] zeroCorrelationZoneConfig Ncs value of unconstrained set 0 0 1 17 2 35 3 46 4 52 5 57 6 67 7 76 8 88 9 104 10 127 11 164 12 191 13 287 14 383 15 575

[0195] Table 4 Configuration values

[0196] zeroCorrelationZoneConfig Ncs value of unconstrained set 0 0 1 17 2 20 3 25 4 30 5 35 6 44 7 52 8 63 9 82 10 104 11 127 12 164 13 230 14 383 15 575

[0197] In a sub-example, Tables 5 to 7 provide the following information when the length of a single long wideband PRACH sequence is L. RA Three examples when =571.

[0198] For example, the examples in Tables 5 to 7 may be applied to a 30 kHz PRACH SCS.

[0199] In another example, the examples in Tables 5 to 7 may be applied to a 15 kHz PRACH SCS.

[0200] In another example, the supported N CS The values ​​can be different from Table 5 to Table 7 for the supported N CS Select the value as long as N CS (Strictly) Increases as zeroCorrelationZoneConfig increases.

[0201] In another example, the supported N CS The values ​​can be different from Table 5 to Table 7 for the supported N CS values, and may also be selected from N not listed in Tables 5 to 7 CS The value is selected (for example, N selected according to the above examples and / or embodiments) CS value); as long as N CS (Strictly) Increases as zeroCorrelationZoneConfig increases.

[0202] Table 5 Configuration values

[0203] zeroCorrelationZoneConfig Ncs value of the unconstrained set 0 0 1 8 2 16 3 24 4 33 5 43 6 51 7 57 8 63 9 71 10 81 11 95 12 114 13 142 14 190 15 285

[0204] Table 6 Configuration values

[0205] zeroCorrelationZoneConfig Ncs value of unconstrained set 0 0 1 8 2 17 3 22 4 25 5 28 6 33 7 38 8 43 9 51 10 63 11 81 12 95 13 142 14 190 15 285

[0206] Table 7 Configuration values

[0207] zeroCorrelationzoneConfig Ncs value of unconstrained set 0 0 1 8 2 10 3 12 4 15 5 17 6 21 7 25 8 31 9 40 10 51 11 63 12 81 13 114 14 190 15 285

[0208] In a sub-example, Tables 8 to 10 provide the following information when the length of a single long wideband PRACH sequence is L. RA Three examples when =283.

[0209] For example, the examples in Tables 8 to 10 may be applied to a PRACH SCS of 60 kHz.

[0210] In another example, the examples in Tables 8 to 10 may be applied to a 30 kHz PRACH SCS.

[0211] In another example, the examples in Tables 8 to 10 may be applied to a 15 kHz PRACH SCS.

[0212] In another example, the supported N CS The values ​​can be different from Table 8 to Table 10 for the supported N CS Select the value as long as N CS (Strictly) Increases as zeroCorrelationZoneConfig increases.

[0213] In another example, the supported N CS The values ​​can be different from Table 8 to Table 10 for the supported N CS values, and may also be selected from N not listed in Tables 8 to 10 CS The value is selected (for example, N selected according to the above examples and / or embodiments) CS value); as long as N CS (Strictly) Increases as zeroCorrelationZoneConfig increases.

[0214] Table 8 Configuration values

[0215] zeroCorrelationZoneConfig Ncs value of the unconstrained set 0 0 1 4 2 8 3 12 4 16 5 21 6 25 7 28 8 31 9 35 10 40 11 47 12 56 13 70 14 94 15 141

[0216] Table 9 Configuration values

[0217] zeroCorrelationZoneConfig Ncs value of the unconstrained set 0 0 1 4 2 8 3 11 4 12 5 14 6 16 7 18 8 21 9 25 10 31 11 40 12 47 13 70 14 94 15 141

[0218] Table 10 Configuration values

[0219] zeroCorrelationZoneConfig Ncs value of unconstrained set 0 0 1 4 2 5 3 6 4 7 5 8 6 10 7 12 8 15 9 20 10 25 11 31 12 40 13 56 14 94 15 141

[0220] In a sub-example, for a single long wideband PRACH sequence, the supported N CSValues ​​and indices from zeroCorrelationZoneConfg to N CS The corresponding mapping table can be indexed from NR zeroCorrelationZoneConfg to N CS is inferred from the mapping.

[0221] In one example, for a length L RA (L RA =1151,571,283) of a single long PRACH sequence, the zeroCorrelationZoneConfg index (denoted by zeroCorrelationZoneConfg_index) to N CS The mapping is determined as: floor(L RA / (139. / [N cs,139 (zeroCorrelationZoneConfg_index)])), where zeroCorrelationZoneConfg_index is 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, N cs,139 (zeroCorrelationZoneConfg_index) are 0, 2, 4, 6, 8, 10, 12, 13, 15, 17, 19, 23, 27, 34, 46, and 69 respectively; and floor() represents a rounding-down operation.

[0222] In one example, for a length L RA (L RA =1151,571,283) of a single long PRACH sequence, the zeroCorrelationZoneConfg index (denoted by zeroCorrelationZoneConfg_index) to N CS The mapping is determined as: ceil(L RA / (139. / [N cs,139 (zeroCorrelationZoneConfg_index)])), where zeroCorrelationZoneConfg_index is 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, N cs,139 (zeroCorrelationZoneConfg_index) are 0, 2, 4, 6, 8, 10, 12, 13, 15, 17, 19, 23, 27, 34, 46, and 69 respectively, where ceil() represents rounding up.

[0223] In one example, for a length L RA (L RA =1151,571,283) of a single long PRACH sequence, the zeroCorrelationZoneConfg index (denoted by zeroCorrelationZoneConfg_index) to N CS The mapping is determined as: round(L RA / (139. / [N cs,139 (zeroCorrelationZoneConfg_index)])), where zeroCorrelationZoneConfg_index is 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, N cs,139 (zeroCorrelationZoneConfg_index) are 0, 2, 4, 6, 8, 10, 12, 13, 15, 17, 19, 23, 27, 34, 46, 69 respectively, where round() represents the rounding operation mapped to the nearest integer of the number.

[0224] In one example, for a length L RA (L RA =1151,571,283) of a single long PRACH sequence, the zeroCorrelationZoneConfg index (denoted by zeroCorrelationZoneConfg_index) to N CS The mapping is determined as: floor(L RA / (839. / [N cs,839 (zeroCorrelationZoneConfg_index)])), where zeroCorrelationZoneConfg_index is 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, N cs,839 (zeroCorrelationZoneConfg_index) are 0, 13, 15, 18, 22, 26, 32, 38, 46, 59, 76, 93, 119, 167, 279, 419 respectively; and floor() represents rounding down operation.

[0225] In one example, for a length L RA (L RA=1151,571,283) of a single long PRACH sequence, the zeroCorrelationZoneConfg index (denoted by zeroCorrelationZoneConfg_index) to N CS The mapping is determined as: ceil(L RA / (839. / [N cs,839 (zeroCorrelationZoneConfg_index)])), where zeroCorrelationZoneConfg_index is 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, N cs,839 (zeroCorrelationZoneConfg_index) are 0, 13, 15, 18, 22, 26, 32, 38, 46, 59, 76, 93, 119, 167, 279, 419 respectively; and ceil() represents rounding up operation.

[0226] In one example, for a length L RA (L RA =1151,571,283) of a single long PRACH sequence, the zeroCorrelationZoneConfg index (denoted by zeroCorrelationZoneConfg_index) to N CS The mapping is determined as: round(L RA / (839. / [N cs,839 (zeroCorrelationZoneConfg_index)])), where zeroCorrelationZoneConfg_index is 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, N cs,839 (zeroCorrelationZoneConfg_index) are 0, 13, 15, 18, 22, 26, 32, 38, 46, 59, 76, 93, 119, 167, 279, 419 respectively; and round() represents the rounding operation mapped to the nearest integer of the number.

[0227] In one example, for a length L RA (L RA=1151,571,283) of a single long PRACH sequence, the zeroCorrelationZoneConfg index (denoted by zeroCorrelationZoneConfg_index) to N CS The mapping is determined as: floor(L RA / (839. / [N cs,839 (zeroCorrelationZoneConfg_index)])), where zeroCorrelationZoneConfg_index is 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, N cs,839 (zeroCorrelationZoneConfg_index) are 0, 13, 26, 33, 38, 41, 49, 55, 64, 76, 93, 119, 139, 209, 279, 419 respectively; and floor() represents rounding down operation.

[0228] In one example, for a length L RA (L RA =1151,571,283) of a single long PRACH sequence, the zeroCorrelationZoneConfg index (denoted by zeroCorrelationZoneConfg_index) to N CS The mapping is determined as: ceil(L RA / (839. / [N cs,839 (zeroCorrelationZoneConfg_index)])), where zeroCorrelationZoneConfg_index is 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, N cs,839 (zeroCorrelationZoneConfg_index) are 0, 13, 26, 33, 38, 41, 49, 55, 64, 76, 93, 119, 139, 209, 279, and 419 respectively; and ceil() represents rounding up operation.

[0229] In one example, for a length L RA (L RA =1151,571,283) of a single long PRACH sequence, the zeroCorrelationZoneConfg index (denoted by zeroCorrelationZoneConfg_index) to NCS The mapping is determined as: round(L RA / (839. / [N cs,839 (zeroCorrelationZoneConfg_index)])), where zeroCorrelationZoneConfg_index is 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, N cs,839 (zeroCorrelationZoneConfg_index) are 0, 13, 26, 33, 38, 41, 49, 55, 64, 76, 93, 119, 139, 209, 279, 419 respectively; and round() represents the rounding operation mapped to the nearest integer of the number.

[0230] In one example, for a given single long PRACH sequence length L RA (L RA =1151,571,283), N corresponding to a given zeroCorrelationZoneConfg index CS It can be selected according to one of the first to ninth examples of this sub-example.

[0231] In one example, only the unrestrained set for a single long wideband PRACH needs to be defined for the zeroCorrelationZonConfig to N CS The mapping table.

[0232] In one example, the supported formats (referring to the duration of the PRACH sequence and the corresponding CP duration (and gap duration, if any)) of a single long wideband PRACH sequence may reuse all formats or a subset of formats in the NR short PRACH preamble format.

[0233] In one example, for a length L RA The supported formats for a single long wideband PRACH sequence with =1151 can be selected from Table 11.

[0234] In a subexample, for length L RA =1151 long wideband PRACH sequence can support all preamble code formats from Table 11.

[0235] In another sub-example, for length L RA =1151, a long wideband PRACH sequence can support a subset of the preamble formats from Table 11, where if Then the subset may be supported, where T is a predetermined upper limit in selecting the supported PRACH formats.

[0236] In another sub-example, for length L RA =1151, can support a subset of preamble formats from Table 11, where the subset can be one of the following: (1) formats A1-A3 and formats B1-B4; (2) formats A1-A3; and (3) formats B1-B4.

[0237] Table 11 Preamble format

[0238]

[0239] In one example, for a length L RA The supported formats for a single long wideband PRACH sequence with Rt=571 can be selected from Table 12A.

[0240] In a subexample, for length L RA =571 long wideband PRACH sequence, which can support all preamble formats from Table 12A.

[0241] In another sub-example, for length L RA =571 long wideband PRACH sequence, can support a subset of the preamble formats from Table 12A, where if Then the subset may be supported, where T is a predetermined upper limit in selecting the supported PRACH formats.

[0242] In another sub-example, for length L RA =571, can support a subset of preamble formats from Table 12A, where the subset can be one of the following: (1) formats A1-A3 and formats B1-B4; (2) formats A1-A3; and (3) formats B1-B4.

[0243] Table 12A Preamble format

[0244]

[0245] In one example, the number of supported root indices for a single long wideband PRACH and the mapping from logical root sequence indices to physical root sequence indices need to be enhanced according to the NR standard specification.

[0246] In one example, when the configuration length is L RAWhen a single long broadband PRACH sequence is used, the prach-RootSequenceIndex in the RRC-ConfigCommonIE (which indicates the logical root sequence index of the PRACH sequence) also needs to be in the range from 0 to L RA The extension is performed by using the prach-RootSequenceIndex value of –2.

[0247] In a subexample, for L RA =1151 wideband PRACH sequence, the corresponding prach-RootSequenceIndex can be from 0 to 1149.

[0248] In another sub-example, for L RA =571 wideband PRACH sequence, the corresponding prach-RootSequenceIndex can be from 0 to 569.

[0249] In one example, it is necessary to define for a length L RA The mapping from logical root index to physical root index of a single long wideband PRACH sequence of , where, given the logical root index 2*i mapped to the physical root sequence index j, the physical root sequence index corresponding to the logical root index 2*i+1 is L RA –j.

[0250] In a sub-example, the physical root sequence index j corresponding to the logical root index 2*i may be j=i+1, where 0<=i<=(L RA -1) / 2-1; In addition, the physical root sequence index j corresponding to the logical root index 2*i+1 may be j=L RA -i-1, where 0<=i<=(L RA -1) / 2-1.

[0251] In one example, when L RA =1151, the logical index 2*i (0<=i<=574) is mapped to the physical root sequence index i+1; and the logical index 2*i+1 is mapped to the physical root sequence index 1151-i-1 (0<=i<=574).

[0252] In another example, when L RA =571, the logical index 2*i (0<=i<=284) is mapped to the physical root sequence index i+1; and the logical index 2*i+1 is mapped to the physical root sequence index 571-i-1 (0<=i<=284).

[0253] In one example, when a single long wideband PRACH sequence is supported for NR-U according to Table 12B in which a joint table may be used, or according to all entries or a subset of entries for a long wideband PRACH sequence in Table 12C, the PRACH sequence length, PRACH SCS, PUSCH SCS, PRACH allocation expressed in terms of the number of RBs for PUSCH, and the corresponding Supported combinations of values ​​(which are used for baseband signal generation for PRACH as detailed in the NR standard specification).

[0254] Table 12B Combined Table

[0255]

[0256] Table 12C Combined Table

[0257]

[0258] In one example, when a single long wideband PRACH sequence is supported, the frequency domain resource configuration for (multiple) single long wideband PRACH preamble codes can be determined according to higher layer parameters, as shown in the following example.

[0259] In one example, the offset of the lowest PRACH opportunity in the frequency domain relative to PRB 0 of the UL BWP for PRACH (ie, the initial active UL BWP for initial access or another active uplink BWP) is represented by msg1-FrequencyStart (eg, RRC IE RACH-ConfigGeneric).

[0260] In one example, the number of frequency division multiplexing (FDM) PRACH transmission opportunities in a one-time case is represented by msg1-FDM (eg, RRC IERACH-ConfigGeneric), where PRACH frequency resource n RA ={0,1,...,M-1}, where M=msg1-FDM and PRACH opportunities are sorted in increasing order starting from the lowest frequency within the uplink BWP.

[0261] In one example, potential other higher layer parameters (eg, from other RRC information elements) related to the wideband PRACH configuration and / or new higher layer parameters introduced for frequency configuration of long wideband PRACH sequences.

[0262] In one example, PRB0 of an uplink BWP containing a wideband PRACH sequence may be derived through a resource indicator value (RIV) or equivalently through the locationAndBandwidth field of a BWP information element corresponding to the uplink BWP containing the PRACH (eg, through initialUplinkBWP or BWP-Uplink).

[0263] In one example, when there is only one frequency division multiplexing (FDM) PRACH opportunity in the frequency domain, that is, when msg1-FDM=1, the frequency domain position of this PRACH opportunity can be determined according to msg1-FrequencyStart of a given PRB0.

[0264] In one example, more than one frequency division multiplexing (FDM) PRACH opportunity (i.e., msg1-FDM>1) may be supported for wideband PRACH, and the frequency domain positions of the frequency division multiplexing (FDM) PRACH opportunities may be non-contiguous; and an explicit field from a higher-layer parameter may be utilized to indicate an offset from the lowest frequency of the i-th frequency division multiplexing (FDM) PRACH opportunity (1<=i<=msg1-FDM-1) to the highest frequency of the i-1th frequency division multiplexing (FDM) PRACH opportunity, represented by msg1-FDM-offset.

[0265] In a sub-example, msg1-FDM-offset may be configured in the RRC IE RACH-ConfigGeneric.

[0266] In another sub-example, msg1-FDM-offset may be configured such that when the UL BWP consists of multiple nominal channel bandwidths of the unlicensed band, different frequency division multiplexing (FDM) PRACH opportunities may be located at different nominal channel bandwidths of the UL BWP.

[0267] In another sub-example, the frequency domain position of the i-th PRACH opportunity may be determined based on msg1-FDM-offset, msg1-FrequencyStart, and the number of PRBs per single long wideband PRACH (which may be determined based on the length of the PRACH).

[0268] exist Fig. 9 An illustration of the foregoing example is provided in , where the ULBWP contains 4 nominal channel bandwidths.

[0269] Fig. 9 An uplink bandwidth part (BWP) 900 is shown in accordance with an embodiment of the disclosure. Fig. 9The embodiment of uplink BWP 900 shown is for illustration only. Fig. 9 One or more of the components shown may be implemented in dedicated circuits configured to perform the functions described, or one or more of the components may be implemented by one or more processors executing instructions to perform the functions described. Other embodiments may be used without departing from the scope of the present disclosure.

[0270] In one example, for broadband PRACH, more than one frequency division multiplexing (FDM) PRACH opportunity may be supported (i.e., msg1-FDM>1), and the frequency domain positions of the frequency division multiplexing (FDM) PRACH opportunities may be non-contiguous; and the frequency domain position of the i-th PRACH (i>=1) may be implicitly determined based on other higher-layer parameters related to the PRACH configuration and / or UL BWP configuration.

[0271] In a sub-example, if the nominal channel bandwidth is BW MHz, the starting frequency position of the i-th PRACH (i>=1) relative to PRB0 can be determined as msg1-FrequencyStart+(i-1)*BW.

[0272] In another sub-example, if the nominal channel bandwidth is expressed as K PRBs in PRACH SCS, the starting frequency position of the i-th PRACH (i>=1) can be determined as msg1-FrequencyStart+(i-1)*K*12*PRACH_SCS, where PRACH_SCS is the PRACH SCS.

[0273] Fig.10 Another uplink bandwidth part (BWP) 1000 is shown according to an embodiment of the disclosure. Fig.10 The illustrated embodiment of uplink bandwidth part (BWP) 1000 is for illustration only. Fig.10 One or more of the components shown may be implemented in dedicated circuits configured to perform the functions described, or one or more of the components may be implemented by one or more processors executing instructions to perform the functions described. Other embodiments may be used without departing from the scope of the present disclosure.

[0274] like Fig.10 As shown, the UL BWP consists of two nominal channel BWs, where the nominal channel bandwidth can be expressed in MHz or the number of PRBs; and the frequency starting position of PRACH 1 is implicitly derived from the frequency starting position of PRACH 0.

[0275] In one example, when a single long wideband PRACH sequence is supported, the frequency domain resource configuration for (multiple) single long wideband PRACH preamble codes can be determined according to high-level parameters by: (1) explicit configuration of a bitmap indicating (multiple) nominal channels within the UL BWP containing the wideband PRACH sequence, and (2) a frequency offset Fo from the lowest frequency of the wideband PRACH sequence relative to the lowest frequency of the nominal channel containing the wideband PRACH sequence.

[0276] In one example, when a single long wideband PRACH sequence is supported, the number of preambles supported in each time-frequency RACH opportunity (RO) may be increased from 64 (as in the NR standard specification) to a higher number of supported PRACH preambles.

[0277] In one example, the number of supported PRACH preamble codes can be increased to 64*n, where n is an integer, n>1.

[0278] In one example, the number of supported PRACH preambles can be increased to L, where L is an integer, L>64.

[0279] In one example, the number of preambles supported in each RO of a single long wideband PRACH sequence may be fixed regardless of the long wideband PRACH sequence length and / or the PRACH SCS.

[0280] For example, the number of preambles supported in each RO of a single long wideband PRACH sequence may be fixed to one of 128 / 256 / 512.

[0281] In one example, the number of preambles supported in each RO of a single long wideband PRACH sequence may be scaled relative to the long wideband PRACH sequence length and / or the PRACH SCS.

[0282] In a sub-example, the number of preambles in each RO may increase as the number of long wideband PRACH sequences increases. For example, the number of preambles may be: (1) 128 for a long wideband PRACH sequence of length 283; (2) 256 for a long wideband PRACH sequence of length 571; (3) 512 for a long wideband PRACH sequence of length 1151.

[0283] In another sub-example, the number of preambles in each RO may decrease as the long wideband PRACH sequence SCS increases.

[0284] In one example, for long wideband PRACH sequences with an increased number of preambles supported at each RO, the mapping order from SS / PBCH block index to valid RACH opportunities can follow the same ordering shown in the NR standard specification, that is, first, within a single PRACH opportunity, in ascending order of preamble index; second, for PRACH opportunities with frequency multiplexing, in ascending order of frequency resource index; third, for PRACH opportunities with time multiplexing within a PRACH time slot, in ascending order of time resource index; fourth, for PRACH time slots, in ascending order of index.

[0285] In one example, for long wideband PRACH sequences with an increased number of preambles supported at each RO, the number of bits of the random access preamble index in the order of the PDCCH triggering the PRACH transmission may be increased beyond 6 bits.

[0286] In a sub-example, if the number of preambles supported at each RO is N, the number of bits in the Random Access Preamble field of the PDCCH order may be For example, for N=128, 256, and 512, the number of bits of the random access preamble field of the PDCCH command may be 7, 8, and 9, respectively.

[0287] In one embodiment, a configuration for wideband PRACH with NR PRACH sequences repeated in the frequency domain is provided.

[0288] In such an embodiment, a method and manner are provided for configuring a wideband PRACH by repeating a basic PRACH sequence in the frequency domain so that a combined wideband PRACH sequence can occupy at least 80% of the nominal channel bandwidth of an unlicensed band. In the remainder of the present disclosure, a basic PRACH sequence refers to a legacy NR PRACH sequence or a PRACH sequence having the same sequence length as a legacy NR PRACH sequence, wherein a repetition of multiple (possibly different) basic PRACH sequences may include a combined wideband NR-U PRACH sequence.

[0289] In one example, the number of repetitions of the basic PRACH sequence in the combined wideband PRACH may be indicated by one of explicit indications through higher layer parameters, or implicitly derived based on other system information, or fixed in the specification.

[0290] In one example, the number of repetitions of the basic PRACH sequence that constitutes the combined wideband NR-U PRACH may be explicitly indicated by a higher layer parameter in an RRC information element.

[0291] In one sub-example, the number of repetitions may be configured according to one of all or a subset of {1, 2, 4, 8}.

[0292] For example, this can be indicated by introducing an RRC field called msg1-Repetition or msg1-FDM-Bundled-r16NRU into the RRC information element RRC-ConfigGeneric. This RRC field can be interpreted as the number of repetitions that are bundled and frequency-division multiplexed in the one-shot case for NR-UPRACH transmissions within a single LBT subband. The UE treats the RACH time occupied by the bundled repetitions as one RO. The updated RACH-ConfigGeneric information element can be as follows:

[0293] RACH-ConfigGeneric Information Element

[0294]

[0295] In one example, this may be indicated by reusing and reinterpreting the existing RRC field msg1-FDM, which is used in the NR standard specification to indicate the number of PRACH transmission opportunities that are frequency-division multiplexed in a one-time case.

[0296] In one sub-example, the number of repetitions may be configured according to one of all or a subset of {1, 2, 4, 8}.

[0297] In one example, the number of repetitions of the basic PRACH sequence that constitutes the combined wideband NR-U PRACH sequence can be implicitly derived as ceil(80%*nominal channel bandwidth / NR PRACH sequence bandwidth), where the nominal channel bandwidth can be fixed for a given unlicensed band (for example, 20 MHz for the 5 GHz band), or configured by higher-level parameters, or can be interpreted as the desired bandwidth of the combined PRACH sequence, which can be fixed or configurable; and the NR PRACH sequence bandwidth depends on the basic PRACH sequence length and the subcarrier spacing of the basic PRACH sequence, both of which can be indicated by higher-level parameters.

[0298] For example, for a nominal channel bandwidth = 20 MHz, the number of base sequences is 4 for 15 kHz and 8 for 30 kHz.

[0299] In another example, for a nominal channel bandwidth = 10 MHz, the number of base sequences is 2 for 15 kHz and 4 for 30 kHz.

[0300] In one example, the number of repetitions of a basic PRACH sequence constituting a combined wideband NR-U PRACH sequence may be implicitly derived as the minimum number of basic NR PRACH sequences such that: (f_highest-f_lowest)>=80%*nominal channel bandwidth, where the nominal channel bandwidth may be fixed for a given unlicensed band (e.g., 20 MHz for a 5 GHz band), or configured by higher layer parameters, or may be interpreted as the desired bandwidth of the combined PRACH sequence, which may be fixed or configurable; and f_highest and f_lowest are the highest and lowest frequencies of the repeated basic sequences, where the repeated basic sequences may be allocated in the frequency domain according to the aforementioned examples and / or embodiments.

[0301] For example, for a nominal channel bandwidth = 20 MHz, the number of base sequences is 4 for 15 kHz and 8 for 30 kHz.

[0302] In another example, for a nominal channel bandwidth = 10 MHz, the number of base sequences is 2 for 15 kHz and 4 for 30 kHz.

[0303] In one example, the number of repetitions of the basic PRACH sequence that makes up the combined wideband NR-U PRACH sequence may be fixed by specification.

[0304] For example, if the NR-U PRACH subcarrier spacing is fixed to 30 kHz, then if the nominal channel bandwidth is 20 MHz (e.g., for a 5 GHz unlicensed band), the number of repetitions of the basic PRACH sequence may be fixed to 4.

[0305] In another example, the set of potential repetition numbers of the basic PRACH sequences that make up the combined wideband NR-U PRACH sequence may be fixed by the specification, and the actual number of repetitions may be indicated using the aforementioned examples and / or embodiments. For example, the set of repetition numbers for 15 kHz may be {2, 4}, while the set of repetition numbers for 30 kHz may be {4, 8}.

[0306] In one example, the repetitions of the elementary PRACH sequences constituting the combined wideband NR-U PRACH sequence may be contiguous in the frequency domain at one of the resource element (RE) level or the resource block (RB) level (equivalently repetition at the RACH opportunity level).

[0307] In one example, the repetitions of the basic PRACH sequence can be continuous at the resource element (RE) level in the frequency domain, which means that if the number of repetitions is n and each basic PRACH sequence is L, the combined wideband NR-U PRACH sequence consists of n*L consecutive REs or subcarriers.

[0308] In one sub-example, the number of repetitions n may be determined according to the foregoing examples and / or embodiments.

[0309] In another sub-example, the RE offset from the starting RE of the combined wideband NR-U PRACH relative to the lowest RE of the starting PRB containing the combined wideband NR-U PRACH may be: in, is the number of PRBs that can contain a wideband PRACH sequence. The RE offset from the starting RE of the combined wideband NR-U PRACH relative to the lowest RE containing the starting PRB of the combined wideband NR-U PRACH, i.e. It can be interpreted as: within the k PRBs containing the wideband PRACH sequence, the starting RE index of the combined wideband NR-U PRACH is indexed in increasing order of frequency starting from 0 to 12*k-1.

[0310] In one example, the basic PRACH sequence length L=139, and the number of repetitions n may be 1, 2, 4, or 8, and thus the number of RBs k containing the wideband PRACH sequence may be 12, 24, 47, or 93 PRBs, respectively. As a result, the RE offset from the starting RE of the combined wideband NR-U PRACH relative to the lowest RE containing the starting PRB of the combined wideband NR-U PRACH may be: This example is summarized in Table 13, where one or more rows of Table 13 can be applied, and n and n are defined in this sub-example.

[0311] Table 13 RB and PRACH sequence

[0312]

[0313] In another sub-example, the RE offset from the starting RE of the combined wideband NR-U PRACH relative to the lowest RE of the starting PRB containing the combined wideband NR-U PRACH may be: in is the number of PRBs that can contain a wideband PRACH sequence. The RE offset from the starting RE of the combined wideband NR-U PRACH relative to the lowest RE containing the starting PRB of the combined wideband NR-U PRACH, i.e. It can also be interpreted as: within the k PRBs containing the wideband PRACH sequence, the starting RE index of the combined wideband NR-U PRACH is indexed in increasing order of frequency starting from 0 to 12*k-1.

[0314] In one example, the basic PRACH sequence length L=139, and the number of repetitions n may be 1, 2, 4, or 8, and thus the number of RBs k containing the wideband PRACH sequence may be 12, 24, 47, or 93 PRBs, respectively. As a result, the RE offset from the starting RE of the combined wideband NR-U PRACH relative to the lowest RE containing the starting PRB of the combined wideband NR-U PRACH may be: They can be 3, 5, 4, and 2, respectively. This example is summarized in Table 14, where one or more rows of Table 14 can be applied, and n and n are defined in this sub-example.

[0315] Table 14 RB and PRACH sequence

[0316]

[0317] In another sub-example, the RE offset from the starting RE of the combined wideband NR-U PRACH relative to the lowest RE of the starting PRB containing the combined wideband NR-U PRACH may be: in is the number of PRBs that can contain a wideband PRACH sequence. The RE offset from the starting RE of the combined wideband NR-U PRACH relative to the lowest RE containing the starting PRB of the combined wideband NR-U PRACH, i.e. It can also be interpreted as: within the k PRBs containing the wideband PRACH sequence, the starting RE index of the combined wideband NR-U PRACH is indexed in increasing order of frequency starting from 0 to 12*k-1.

[0318] In one example, the basic PRACH sequence length L=139, and the number of repetitions n may be 1, 2, 4, or 8, and thus the number of RBs k containing the wideband PRACH sequence may be 12, 24, 48, or 96 PRBs, respectively. As a result, the RE offset from the starting RE of the combined wideband NR-U PRACH relative to the lowest RE containing the starting PRB of the combined wideband NR-U PRACH may be: can be 2, 5, 10, 20 respectively. This example is summarized in Table 15, where one or more rows of Table 15 can be applied, and n and are defined in this sub-example.

[0319] Table 15 RB and PRACH sequence

[0320]

[0321] In another sub-example, the RE offset from the starting RE of the combined wideband NR-U PRACH relative to the lowest RE of the starting PRB containing the combined wideband NR-U PRACH may be: in is the number of PRBs that can contain a wideband PRACH sequence. The RE offset from the starting RE of the combined wideband NR-U PRACH relative to the lowest RE containing the starting PRB of the combined wideband NR-U PRACH, i.e. It can also be interpreted as: within the k PRBs containing the wideband PRACH sequence, the starting RE index of the combined wideband NR-U PRACH is indexed in increasing order of frequency starting from 0 to 12*k-1.

[0322] In one example, the basic PRACH sequence length L=139, and the number of repetitions n may be 1, 2, 4, or 8, and thus the number of RBs k containing the wideband PRACH sequence may be 12, 24, 48, or 96 PRBs, respectively. As a result, the RE offset from the starting RE of the combined wideband NR-U PRACH relative to the lowest RE containing the starting PRB of the combined wideband NR-U PRACH may be: They can be 3, 5, 10, and 20 respectively. This example is summarized in Table 16, where one or more rows of Table 16 can be applied, and n and are defined in this sub-example.

[0323] Table 16 RB and PRACH sequence

[0324]

[0325] In another sub-example, the RE offset from the starting RE of the combined wideband NR-U PRACH relative to the lowest RE of the starting PRB containing the combined wideband NR-U PRACH can be the same as the NR standard specification, for example, 2 REs.

[0326] In another sub-example, the RE offset from the starting RE of the combined wideband NR-U PRACH relative to the lowest RE of the starting PRB containing the combined wideband NR-U PRACH may be configured by a higher layer parameter.

[0327] In another sub-example, the RE offset from the starting RE of the combined wideband NR-U PRACH relative to the lowest RE of the starting PRB containing the combined wideband NR-U PRACH can be configured through DCI scheduling.

[0328] In another sub-example, this example may be referred to as "RE" level repetition.

[0329] Fig.11A An example nominal channel BW 1100 is shown in accordance with an embodiment of the disclosure. Fig.11A The embodiment of nominal channel BW 1100 shown is for illustration only. Fig.11A One or more of the components shown may be implemented in dedicated circuits configured to perform the functions described, or one or more of the components may be implemented by one or more processors executing instructions to perform the functions described. Other embodiments may be used without departing from the scope of the present disclosure.

[0330] like Fig.11A As shown, the nominal channel BW is 20 MHz, the PRACH SCS is 30 kHz, and n is 4, L=139.

[0331] In one example, the repetitions of the basic PRACH sequence can be continuous in the frequency domain at the resource block (RB) level, or equivalently at the RACH opportunity level, which means that if the number of repetitions is n, and each basic PRACH sequence is L, which occupies M RBs, then the combined wideband NR-U PRACH sequence consists of nM consecutive RBs, where each of the M RBs includes the basic PRACH sequence of L REs.

[0332] In a sub-example, the number of repetitions n may be determined according to the aforementioned embodiments and examples.

[0333] In another sub-example, the RE offset from the starting RE of each basic PRACH sequence relative to the lowest RE of the starting PRB containing the basic PRACH sequence can be the same as in the NR standard specification, for example, 2 REs.

[0334] In another sub-example, the RE offset from the starting RE of each basic PRACH sequence relative to the lowest RE of the starting PRB containing the basic PRACH sequence may be configured by a higher layer parameter.

[0335] In another sub-example, the RE offset from the starting RE of each basic PRACH sequence relative to the lowest RE of the starting PRB containing the basic PRACH sequence may be configured through DCI scheduling.

[0336] In another sub-example, this example may be referred to as "RO" level repetition.

[0337] Fig. 11B Another example nominal channel BW 1150 is shown according to an embodiment of the disclosure. Fig. 11B The embodiment of nominal channel BW 1150 shown in FIG. 1 is for illustration only. Fig. 11B One or more of the components shown may be implemented in dedicated circuits configured to perform the functions described, or one or more of the components may be implemented by one or more processors executing instructions to perform the functions described. Other embodiments may be used without departing from the scope of the present disclosure.

[0338] like Fig. 11B As shown, the nominal channel BW is 20 MHz, the PRACH SCS is 30 kHz, and n is 4, L=139, and M=12.

[0339] In one example, the frequency offset (RB level offset) value Fo can be configured to indicate the lowest frequency of the combined wideband NR-U PRACH sequence relative to the lowest frequency of the nominal channel bandwidth containing the combined wideband NR-U PRACH.

[0340] In a sub-example, the frequency offset value Fo of the RB may be configured by introducing an RRC field in the RACH-ConfigGeneric IE.

[0341] In another sub-example, the frequency offset value Fo can reuse the msg1-FrequencyStart field from the NR standard specification.

[0342] In one example, the frequency offset (RB level offset) value Fo may be configured to indicate the lowest frequency of the combined wideband NR-U PRACH sequence relative to the lowest frequency of the UL BWP containing the combined wideband NR-U PRACH.

[0343] In a sub-example, the frequency offset value Fo of the RB may be configured by introducing an RRC field in the RACH-ConfigGeneric IE.

[0344] In another sub-example, the frequency offset value Fo can reuse the msg1-FrequencyStart field from the NR standard specification.

[0345] In one example, repetitions of a basic PRACH sequence including a combined wideband NR-U PRACH sequence may be non-contiguous at the RB level in the frequency domain.

[0346] In one example, the i-th base sequence and the i+1-th base sequence constituting the combined wideband NR-U PRACH sequence may have a gap of N RBs.

[0347] In one sub-example, the gap may be calculated as the gap between the highest RB index containing the i-th base sequence and the lowest RB index containing the i+1-th base sequence, where the base sequence indices are sorted in ascending order in the frequency domain.

[0348] In one example, the number N of gap RBs may be configured by a higher layer parameter (eg, by an RRC layer).

[0349] In one example, different combined wideband NR-U PRACH sequences within the same active UL BWP may be non-contiguous in the frequency domain, and different combined wideband NR-U PRACH sequences within the same UL BWP may be contained in different nominal channel bandwidths.

[0350] In one example, the frequency resource allocation for each basic NR PRACH sequence within the same nominal channel bandwidth may be selected according to the aforementioned examples and / or embodiments.

[0351] In one example, the frequency gap of N RBs between adjacent combined wideband NR-U PRACH sequences can be configured by introducing higher layer parameters, and the frequency offset (RB level offset) value F can be configured to indicate the lowest frequency of the first wideband NR-UPRACH sequence (sorted in increasing order in the frequency domain) relative to the lowest frequency of the UL BWP.

[0352] Fig. 12A An example UL BWP with a frequency offset 1200 is shown in accordance with an embodiment of the disclosure. Fig. 12A The illustrated embodiment of a ULBWP with a frequency offset 1200 is for illustration only. Fig. 12A One or more of the components shown may be implemented in dedicated circuits configured to perform the functions described, or one or more of the components may be implemented by one or more processors executing instructions to perform the functions described. Other embodiments may be used without departing from the scope of the present disclosure.

[0353] In a sub-example, the frequency gap of N RBs may be configured by introducing an RRC field in the RACH-ConfigGeneric IE.

[0354] In another sub-example, the frequency offset value F may reuse the msg1-FrequencyStart field from the NR standard specification, which refers to the offset of the lowest PRACH opportunity in the frequency domain relative to PRB0 of the UL BWP.

[0355] In another sub-example, a frequency offset value F may be introduced to be indicated in the RACH-ConfigGeneric IE.

[0356] In one example, the frequency offset value Fo can be configured to indicate the lowest frequency of the combined wideband NR-U PRACH sequence relative to the lowest frequency of the nominal channel bandwidth containing the combined wideband NR-U PRACH.

[0357] Fig. 12B Another example UL BWP with a frequency offset 1250 is shown in accordance with an embodiment of the disclosure. Fig. 12B The embodiment of the UL BWP with frequency offset 1250 shown in FIG. 1 is for illustration only. Fig. 12B One or more of the components shown may be implemented in dedicated circuits configured to perform the functions described, or one or more of the components may be implemented by one or more processors executing instructions to perform the functions described. Other embodiments may be used without departing from the scope of the present disclosure.

[0358] In a sub-example, the frequency offset value Fo of the RB may be configured by introducing an RRC field in the RACH-ConfigGeneric IE.

[0359] In another sub-example, the frequency offset value Fo can reuse the msg1-FrequencyStart field from the NR standard specification.

[0360] In one example, the frequency offset value Fo may be configured to indicate the lowest frequency of the combined wideband NR-U PRACH sequence relative to the lowest frequency of the UL BWP containing the combined wideband NR-U PRACH.

[0361] In one example, no base PRACH sequence may be mapped to different portions across adjacent subbands.

[0362] In one example, the frequency domain allocation of (multiple) combined wideband PRACH sequences within the UL BWP can be configured by explicit configuration of the number M of frequency-division multiplexed wideband PRACH sequences and the frequency offset F from the lowest wideband PRACH sequence in the frequency domain relative to PRB0 of the ULBWP.

[0363] In an example, the number of repetitions of the basic PRACH sequence in the combined wideband PRACH may be obtained through the aforementioned embodiments and / or examples.

[0364] In one example, the number M of frequency-division multiplexed wideband PRACH sequences may reuse the higher layer parameter msg1-FDM field from the NR standard specification, where msg1-FDM may be reinterpreted as the number of frequency-division multiplexed wideband NR-U PRACH opportunities in a one-time case.

[0365] In one example, the number M of frequency-division multiplexed wideband PRACH sequences can be implicitly derived from the high-layer parameter msg1-FDM field from the NR standard specification, where msg1-FDM can represent the number of basic NR-U PRACH opportunities frequency-division multiplexed in a one-time case, and the number M of frequency-division multiplexed wideband PRACH sequences = msg1-FDM / N, where N represents the number of repetitions of the basic PRACH sequence in the combined wideband PRACH derived from the aforementioned embodiments and / or examples.

[0366] In one example, the number M of frequency-division multiplexed wideband PRACH sequences may be configured by introducing a new higher layer parameter repeat-msg1-FDM for NR-U.

[0367] For example, the value of repeat-msg1-FDM can be one of {1,2,3,4,5} or {1,2,3,4}.

[0368] In one example, according to the aforementioned examples and / or embodiments, the frequency domain position of each combined wideband PRACH sequence frequency-division multiplexed in a one-time case can be determined by the frequency offset F and the frequency gap of N RBs between adjacent combined wideband NR-U PRACH sequences.

[0369] For example, the i-th frequency-division multiplexed wideband PRACH sequence starts at F+(i-1)*(wideband PRACH bandwidth+N*12*PRACH SCS) relative to PRB0 of UL BWP, where 1<=i<=M. Fig. 12A An illustration of this example is shown in , where M=4.

[0370] In one example, the frequency domain position of each combined wideband PRACH sequence frequency-division multiplexed in a one-time case may be determined by a frequency offset F, and each wideband PRACH sequence may have the same offset from the lowest frequency relative to the lowest frequency of the nominal channel bandwidth containing the combined wideband NR-UPRACH.

[0371] For example, the i-th frequency-division multiplexed wideband PRACH sequence starts at F+(i-1)*(the bandwidth of the nominal channel bandwidth) relative to PRB0 of the UL BWP, where 1<=i<=M. Fig.13 This example is shown in , where M=3.

[0372] Fig.13 Yet another example UL BWP with a frequency offset 1300 is shown in accordance with an embodiment of the disclosure. Fig.13 The embodiment of the UL BWP with frequency offset 1300 shown in FIG. 1 is for illustration only. Fig.13 One or more of the components shown may be implemented in dedicated circuits configured to perform the functions described, or one or more of the components may be implemented by one or more processors executing instructions to perform the functions described. Other embodiments may be used without departing from the scope of the present disclosure.

[0373] In one embodiment, the frequency domain allocation of (multiple) combined wideband PRACH sequences within the UL BWP can be configured by indicating a bitmap of (multiple) nominal channels containing wideband PRACH sequences within the UL BWP, and an explicit configuration of a frequency offset Fo from the lowest frequency of the wideband PRACH sequence relative to the lowest frequency of the nominal channels containing the wideband PRACH sequence.

[0374] In one example, the number of nominal channel(s) contained within the UL BWP may be obtained by the location and bandwidth of the UL BWP, or equivalently, a resource indication value (RIV).

[0375] In one example, according to the aforementioned examples and / or embodiments, a frequency offset Fo from the lowest frequency of the wideband PRACH sequence relative to the lowest frequency of the nominal channel containing the wideband PRACH sequence may be obtained.

[0376] In one example, a bitmap indicating the nominal channel(s) within a ULBWP containing a wideband PRACH sequence may be indicated by introducing a new higher layer parameter, where the size of the bitmap may be the number of nominal channels within the ULBWP.

[0377] In one example, the bitmap may be introduced as a higher layer field called repeated-PRACH-bitmap in the RRC IE RACH-ConfigCommon.

[0378] In one example, a bitmap indicating the nominal channel(s) within a ULBWP containing a wideband PRACH sequence may be fixed by the specification.

[0379] Fig.14Yet another example UL BWP with a frequency offset 1400 is shown in accordance with an embodiment of the disclosure. Fig.14 The embodiment of the UL BWP with frequency offset 1400 shown in FIG. 1 is for illustration only. Fig.14 One or more of the components shown may be implemented in dedicated circuits configured to perform the functions described, or one or more of the components may be implemented by one or more processors executing instructions to perform the functions described. Other embodiments may be used without departing from the scope of the present disclosure.

[0380] like Fig.14 As shown, where the bitmap is (1, 0, 0, 1), the i-th bit (ordered from right to left) corresponds to whether the i-th combined wideband PRACH (in increasing order of frequency) is present in the UL BWP.

[0381] In one embodiment, the basic NR PRACH sequences constituting the combined wideband PRACH sequence may be pure repetitions with the same root sequence, cyclic shift and phase.

[0382] In one example, the root sequence and cyclic shift are determined according to the same process as in the NR standard specification.

[0383] In one embodiment, the basic NR PRACH sequences constituting the combined wideband PRACH sequence may have different phase rotations, and / or cyclic shifts, and / or root sequences.

[0384] In one example, one of the NR PRACH sequences constituting the combined wideband PRACH sequence may be selected according to the same procedure as in the NR standard specification, and the NR PRACH sequence may be a base basic NR PRACH sequence, wherein other base NR PRACH sequences of the same combined wideband PRACH sequence may have different phase rotations, and / or cyclic shifts, and / or root sequences relative to the base basic NR PRACH sequence.

[0385] In a sub-example, the underlying basic NR PRACH sequence may be a sequence having the lowest frequency or the highest frequency among the basic NR PRACH sequences constituting the combined wideband PRACH sequence.

[0386] In another sub-example, the underlying basic NR-U PRACH sequence may be any one of the constituent combined wideband NR-U PRACH sequences, which may be fixed, determined by the UE, or configured by higher layer parameters.

[0387] In one example, the NR PRACH sequences that make up the combined wideband PRACH sequence can be selected first according to the same process as in the NR standard specification, and the NR PRACH sequence can be a basic fundamental NR PRACH sequence; wherein, on top of the basic fundamental NR PRACH sequence, each basic NR PRACH sequence of the same combined wideband PRACH sequence can have a different phase rotation, and / or cyclic shift, and / or root sequence relative to the basic fundamental NR PRACH sequence.

[0388] In one example, the basic NR PRACH sequences within the same combined wideband PRACH sequence can have a phase rotation relative to the basic fundamental NR PRACH sequence.

[0389] In a sub-example, if the combined wideband PRACH sequence is composed of N basic NR PRACH sequences, and the first basic NR PRACH sequence represents the basic fundamental NR PRACH sequence; then the phase rotation of the i-th basic NR PRACH sequence (1 <= i <= N) relative to the basic fundamental NR PRACH sequence is where

[0390] In another sub-example, the phase rotation of adjacent basic NR PRACH sequences of the combined wideband PRACH sequence can be configured by a higher layer parameter.

[0391] In another sub-example, the phase rotation of adjacent basic NR PRACH sequences of the combined wideband PRACH sequence can be determined by the UE. For example, the UE can select a phase rotation that can minimize a metric (such as the peak-to-average power ratio (PAPR) or the cubic metric).

[0392] In another sub-example, the phase rotation of adjacent basic NR PRACH sequences of the combined wideband PRACH sequence can be fixed by the specification.

[0393] For example, it can be 2π / N, where N is the number of basic sequences of the combined wideband PRACH. In another example, the phase rotation of the i-th (0 <= i < N) basic PRACH sequence of the combined wideband PRACH sequence can be fixed as where N is the number of basic sequences within the wideband PRACH. In addition, for different N, the set of fixed phase rotations can be different.

[0394] In another sub-example, the phase shift values ​​for different basic PRACH sequences with a PRACH SCS of 15 kHz within the nominal channel bandwidth may be selected from one or more rows from Table 17, where each column represents the phase shift at a basic PRACH sequence of a repeated PRACH sequence, and the (multiple) rows may be selected based on one of being determined by the UE (depending on the UE implementation), fixed in the specification, or configured via higher layer parameters or dynamic L1 indications.

[0395] Table 17 Phase shift value

[0396]

[0397] In another sub-example, the phase shift values ​​for different basic PRACH sequences with a PRACH SCS of 30 kHz within the nominal channel bandwidth may be selected from one or more rows from Table 18, where each column represents the phase shift at one basic PRACH sequence of the repeated PRACH sequence, and the row(s) may be selected based on one of being determined by the UE (depending on the UE implementation), fixed in the specification, or configured via a higher layer parameter or a dynamic L1 indication. In Table 18, ±0.7071 is equivalent to ±0.8660 is equivalent to

[0398] Table 18 Phase shift value

[0399] 1 -0.5000+0.8660i -0.7071+0.7071i 0.7071+0.7071i 1 -0.8660-0.5000i 0.7071-0.7071i 0.7071-0.7071i 1 0.8660-0.5000i 0.7071+0.7071i -0.7071-0.7071i 1 0.5000+0.8660i -0.7071-0.7071i -0.7071+0.7071i 1 -0.5000-0.8660i -0.7071-0.7071i 0.7071-0.7071i 1 0.5000-0.8660i -0.7071+0.7071i -0.7071-0.7071i 1 -0.5000+0.8660i -0.8660+0.5000i 0.5000+0.8660i 1 -0.0000-1.0000i 0.5000-0.8660i 0.5000+0.8660i 1 -0.5000-0.8660i 1.0000+0.0000i 0.8660+0.5000i 1 0.8660+0.5000i -0.8660+0.5000i 0.8660+0.5000i 1 0.5000+0.8660i -0.8660-0.5000i -0.5000+0.8660i 1 -0.0000-1.0000i 0.5000+0.8660i -0.5000+0.8660i 1 0.5000-0.8660i 1.0000+0.0000i -0.8660+0.5000i 1 -0.8660+0.5000i -0.8660-0.5000i -0.8660+0.5000i 1 1.0000+0.0000i 0.0000+1.0000i 0.5000-0.8660i 1 -0.8660-0.5000i 0.5000-0.8660i 0.5000-0.8660i 1 -0.8660+0.5000i 0.7071+0.7071i 0.7071+0.7071i 1 0.8660+0.5000i 0.7071-0.7071i -0.7071+0.7071i 1 0.0000+1.0000i 0.0000+1.0000i 0.8660-0.5000i 1 -0.5000-0.8660i -0.5000-0.8660i 0.8660-0.5000i

[0400] In another sub-example, the phase shift values ​​for different basic PRACH sequences with a PRACH SCS of 30 kHz within the nominal channel bandwidth may be selected from one or more rows from Table 19, where each column represents the phase shift at a basic PRACH sequence of a repeated PRACH sequence, and the row(s) may be selected based on one of a phase shift determined by the UE (depending on the UE implementation), fixed in the specification, or configured via higher layer parameters or a dynamic L1 indication.

[0401] Table 19 Phase shift value

[0402] 1 -1.0000+0.0000i -0.0000-1.0000i -0.0000-1.0000i 1 1.0000+0.0000i 0.0000+1.0000i -0.0000-1.0000i 1 -0.0000-1.0000i 1.0000+0.0000i 0.0000+1.0000i 1 0.0000+1.0000i -1.0000+0.0000i 0.0000+1.0000i 1 -0.0000-1.0000i -0.0000-1.0000i 1.0000+0.0000i 1 0.0000+1.0000i 0.0000+1.0000i 1.0000+0.0000i 1 1.0000+0.0000i 1.0000+0.0000i -1.0000+0.0000i 1 -1.0000+0.0000i -1.0000+0.0000i -1.0000+0.0000i 1 0.0000+1.0000i -0.0000-1.0000i -1.0000+0.0000i 1 -0.0000-1.0000i 0.0000+1.0000i -1.0000+0.0000i 1 -1.0000+0.0000i 1.0000+0.0000i 1.0000+0.0000i 1 1.0000+0.0000i -1.0000+0.0000i 1.0000+0.0000i 1 1.0000+0.0000i -0.0000-1.0000i 0.0000+1.0000i 1 -1.0000+0.0000i 0.0000+1.0000i 0.0000+1.0000i 1 0.0000+1.0000i 1.0000+0.0000i -0.0000-1.0000i 1 -0.0000-1.0000i -1.0000+0.0000i -0.0000-1.0000i 1 0.0000+1.0000i 0.0000+1.0000i -0.0000-1.0000i 1 -1.0000+0.0000i -1.0000+0.0000i -0.0000-1.0000i 1 1.0000+0.0000i -1.0000+0.0000i -0.0000-1.0000i 1 0.0000+1.0000i -0.0000-1.0000i -0.0000-1.0000i

[0403] In another sub-example, different repetitions of the basic PRACH sequence may only have different phase shifts, while the cyclic shift and the root sequence need to be the same.

[0404] In another sub-example, different repetitions of the basic PRACH sequence may have different phase shifts, as well as different cyclic shifts and / or root sequences.

[0405] In one example, the base NR PRACH sequence within the same combined wideband PRACH sequence may have a different cyclic shift relative to the underlying base NR PRACH sequence.

[0406] In a sub-example, if the combined wideband PRACH sequence consists of N base NR PRACH sequences, and the first base NR PRACH sequence represents a base base NR PRACH sequence; then if the cyclic shift of the base base NR PRACH sequence is C v =vN cs , the cyclic shift of the i-th basic NR PRACH sequence can be generated first according to the increasing order of the cyclic shift of the logical root index of the basic basic sequence, and then according to the increasing order of the logical root sequence index.

[0407] In one example, if Then the i-th basic NR PRACH sequence may have a cyclic shift of (v+i-1)N for 1<=i<=N CS , where L is the length of the basic NR PRACH sequence.

[0408] In another sub-example, if the combined wideband PRACH sequence consists of N base NR PRACH sequences, and the first base NR PRACH sequence represents a base base NR PRACH sequence; then if the cyclic shift of the base base NR PRACH sequence is C v =vN cs , then the cyclic shift of the i-th basic NR PRACH sequence can be generated as (v+i%K)N for a certain K cs , K can be fixed by the specification or configured by a high-level parameter. For example, K can be 2.

[0409] In another sub-example, the cyclic shift of each base NR PRACH sequence of the combined wideband PRACH sequence relative to the underlying base NR PRACH sequence may be configured by a higher layer parameter.

[0410] In another sub-example, the cyclic shift of each base NR PRACH sequence of the combined wideband PRACH sequence may be determined by the UE (depending on the UE implementation). For example, the UE may select a cyclic shift that minimizes a metric such as peak-to-average power ratio (PAPR) or a cubic metric.

[0411] In another sub-example, the cyclic shift of each base NR PRACH sequence of the combined wideband PRACH sequence may be fixed by specification.

[0412] In one example, the cyclic shift of the i-th (0 <= i < N) basic PRACH sequence of the combined wideband PRACH sequence can be fixed to C i , where N is the number of basic sequences within the wideband PRACH. Additionally, for different N, the set of fixed cyclic shifts can be different.

[0413] In another sub-example, different repeated basic PRACH sequences can have only different cyclic shifts, while the phase shift and the root sequence need to be the same.

[0414] In another sub-example, different repeated basic PRACH sequences can have different cyclic shifts, as well as different phase shifts and / or root sequences.

[0415] In one example, the basic NR PRACH sequences within the same combined wideband PRACH sequence can have different logical root sequence indices relative to the base basic NR PRACH sequence.

[0416] In a sub-example, if the combined wideband PRACH sequence consists of N basic NR PRACH sequences, and the first basic NR PRACH sequence represents the base basic NR PRACH sequence; then if the root index of the base basic NR PRACH sequence is u, the logical root index of the i-th basic NR PRACH sequence for (1 <= i <= N) can be u - i.

[0417] In another sub-example, the root index of each basic NR PRACH sequence of the combined wideband PRACH sequence relative to the base basic NR PRACH sequence can be configured by a higher layer parameter.

[0418] In another sub-example, the root index of each basic NR PRACH sequence of the combined wideband PRACH sequence can be determined by the UE. For example, the UE can select a root index that can minimize a metric (such as the peak-to-average power ratio (PAPR) or the cubic metric).

[0419] In another sub-example, the root index of each basic NR PRACH sequence of the combined wideband PRACH sequence can be fixed by a specification.

[0420] In one example, within each basic PRACH sequence of the combined wideband PRACH sequence, the subcarriers of the basic PRACH sequence can have a fixed phase rotation relative to the previous subcarrier of the basic PRACH sequence.

[0421] In one sub-example, for a base PRACH sequence of length L, where subcarriers are indexed from 0 to L-1, the i-th subcarrier of the base sequence may have a phase rotation α with respect to the (i-1)-th subcarrier (1<=i<=L-1).

[0422] In another sub-example, the phase rotation between adjacent subcarriers can be one of the following: fixed in the specification; and / or determined according to the PRACH sequence length; and / or determined according to the index of the repetition of the basic PRACH sequence (i.e., if the wideband PRACH consists of N repetitions, it is the repetition index of the current basic sequence); and / or the number of subcarriers in the RO containing the basic PRACH sequence; and / or indicated by higher layer parameters or DCI or MAC CE.

[0423] In another sub-example, the phase rotation of the 0th subcarrier of the PRACH sequence can be one of the following: fixed in the specification; and / or determined according to the PRACH sequence length; and / or determined according to the index of the repetition of the basic PRACH sequence (i.e., if the wideband PRACH consists of N repetitions, it is the repetition index of the current basic sequence); and / or the number of subcarriers in the RO containing the basic PRACH sequence; and / or indicated by higher layer parameters or DCI or MAC CE.

[0424] In another sub-example, the foregoing examples and / or embodiments may be applied to RE level repetition, RO level repetition, or both RE level and RO level repetition.

[0425] In another sub-example, the aforementioned examples and / or embodiments may be applied in combination with one or more of the aforementioned examples and / or embodiments.

[0426] In another sub-example, the fixed phase rotations of different basic PRACH sequences within the wideband PRACH may be different.

[0427] For example, for N base sequences in a wideband PRACH sequence, the fixed phase rotation between adjacent PRACH subcarriers of the i-th base sequence (1<=i<=N) may be β+i*α.

[0428] In one example, for N=4 repetitions with a PRACH SCS of 30 kHz, β=1 degree, and α=1 degree. In addition, the phase shift across N=4 repetitions according to the aforementioned examples and / or embodiments may be applied, with the phase shift across repetitions being (1, 0.7071+0.7071i, 1, -1) or (1.0000+0.0000i, -0.5000+0.8660i, -0.7071+0.7071i, 0.7071+0.7071i).

[0429] In one example, for N=8 repetitions with a PRACH SCS of 15kHz, β=0 degrees and α=0.5 degrees. In addition, a phase shift across N=8 repetitions according to the aforementioned examples and / or embodiments may be applied, where the phase shift across repetitions is (1,1,1i,1i,1,-1i,1,-1).

[0430] In another example, in the case of N base sequences in a wideband PRACH sequence, the fixed phase rotation between adjacent PRACH subcarriers of the i-th base sequence (1<=i<=N) may be β+(i-1)*α.

[0431] In one example, for N=4 repetitions with a PRACH SCS of 30 kHz, β=1 degree, and α=1 degree. In addition, the phase shift across N=4 repetitions according to the aforementioned examples and / or embodiments may be applied, with the phase shift across repetitions being (1, 0.7071+0.7071i, 1, -1) or (1.0000+0.0000i, -0.5000+0.8660i, -0.7071+0.7071i, 0.7071+0.7071i).

[0432] In one example, for N=8 repetitions with a PRACH SCS of 15kHz, β=0 degrees, and α=0.5 degrees. In addition, the phase shift across N=8 repetitions according to the aforementioned examples and / or embodiments may be applied, with the phase shift across repetitions being (1,1,1i,1i,1,-1i,1,-1).

[0433] In one example, the (From which you can Generate frequency domain representation) Generate random access preamble code set x u，v (n), which depends on the PRACH preamble format, L RA =839 or L RA =139.

[0434] In the above equation, k is the index of the base PRACH sequence repeated within the wideband PRACH sequence; and for N repetitions of the base PRACH sequence within the wideband PRACH sequence, 0<=k<=N-1.

[0435] In the above equation, C k is a cyclic shift change. If the aforementioned example and / or embodiment is configured, the cyclic shift change may be determined according to the fourth example of the aforementioned example and / or embodiment; otherwise, C k =0.

[0436] In the above equation, a kis a phase shift variation across repetitions, which, if the aforementioned examples and / or embodiments are configured, can be determined according to the aforementioned examples and / or embodiments; otherwise a k =1.

[0437] In the above equation, β n，k is the phase shift of the nth subcarrier of the kth basic PRACH sequence, where β n，k -β n-1，k =θ k , and if the aforementioned examples and / or embodiments are configured, θ may be determined according to the sixth example of the aforementioned examples and / or embodiments. k ; otherwise β n，k =0 or θ k =0.

[0438] In a subexample, in C depending on the repetition index k k 、a k and θ k Among them, their values ​​may further depend on the PRACH subcarrier spacing and / or the total number of repetitions of the basic PRACH sequence within the wideband PRACH.

[0439] In a subexample, in C depending on the repetition index k k 、a k and θ k Among them, a joint table can be used to determine their values ​​for different repetition indexes k (0≤k≤N-1).

[0440] For example, Tables 20 to 23 provide examples: k and a k is configured to depend on k and θ k = 0 (i.e., use the default value and do not need to be configured), (C k , a k ) and the PRACH SCS and the relationship between the number of repetitions N of the basic PRACH sequence within the wideband PRACH sequence.

[0441] Table 20 For Δf RA =15kHz and N=4 k and a k

[0442] k <![CDATA[C k ]]> <![CDATA[a k ]]> 0 0 1 1 1 i 2 0 i 3 1 1

[0443] Table 21 For Δf RA =15kHz and N=8 k and a k

[0444] k <![CDATA[C k ]]> <![CDATA[a k ]]> 0 0 1 1 1 i 2 0 i 3 1 -1 4 0 -1 5 1 i 6 0 i 7 1 1

[0445] Table 22 For Δf RA =30kHz and N=2 k and a k

[0446] k <![CDATA[C k ]]> <![CDATA[a k ]]> 0 0 1 1 1 1

[0447] Table 23 For Δf RA =30kHz and N=4 k and a k

[0448] k <![CDATA[C k ]]> <![CDATA[a k ]]> 0 0 1 1 1 i 2 0 i 3 1 1

[0449] In the NR standard specification, the PRACH preamble can be sent only in the time resource given by the high-level parameter PRACHConfigurationIndex. Based on PRACHConfigurationIndex, the RACH timing can be derived from the PRACH configuration table. Specifically, in the NR standard specification, the RACH timing (RO) within the RACH time slot is continuously allocated.

[0450] Assuming that LBT is required before PRACH transmission, it may potentially result in additional time domain resource overhead. Consequently, an important design consideration is how to incorporate the impact of the time domain overhead of performing LBT on the available time domain RACH opportunities within the RACH slot(s).

[0451] Specifically, Figure 8 The CAT-4LBT shown is a baseline LBT procedure for granting independent transmission of PRACH in a RACH opportunity, where the channel access priority class (CAPC) value of PRACH CAT-4LBT can be 1, that is, the highest priority CAT-4LBT with a minimum contention window size (CWS) of 3 and a maximum CWS of 7. In addition, if the RO is within the COT initiated by the gNB, then if the gap is greater than or equal to 25μs, PRACH can also be transmitted through CAT-2LBT of 25μs; otherwise, CAT-1LBT or CAT-2LBT of 16μs can be used.

[0452] Assuming that LBT is required before each PRACH transmission, the continuous allocation of ROs within a PRACH slot may lead to a situation where LBT fails for an RO due to the PRACH transmission utilizing the previous RO. When NR-U uses a wideband PRACH waveform, the LBT blocking problem between adjacent ROs becomes more prominent because the corresponding PRACH transmit power can be close to the maximum allowed transmit power per nominal bandwidth.

[0453] In one embodiment, NR-U may allow adjacent ROs within the same RACH timeslot to be non-contiguous, introducing a gap duration between two adjacent ROs, where the gap may be used to merge LBT resource overhead when sending PRACH in the RO following the gap.

[0454] The present disclosure focuses on enhancements to the NR standard specification to support configuration and indication of LBT gap duration between (multiple) adjacent RACH opportunities for NR-U without changing the existing PRACH configuration table from the NR standard specification.

[0455] In the present disclosure, FR1 NR-U refers to NR-U operating in an unlicensed / shared band in FR1 (such as a 5 GHz unlicensed band or a 6 GHz unlicensed / shared band); and FR2 GHz NR-U refers to NR-U operating in an unlicensed / shared band in FR2 (such as a 60 GHz unlicensed band).

[0456] In one embodiment, enhancements to configuring and indicating LBT gaps for NR-U PRACH are provided. In such embodiments, methods and examples for configuring and indicating methods are provided for LBT gaps between adjacent ROs in NR-U without changing the existing PRACH configuration table from the NR standard specification.

[0457] In one embodiment, adjacent RACH opportunities within (multiple) the same PRACH time slots may be non-contiguous, a gap duration is introduced between two adjacent ROs, wherein the gap may be an integer multiple of an OFDM symbol, and if the LBT processing corresponding to the RACH opportunity (RO) has been successfully completed within the gap duration, the RO after the gap duration may be used for PRACH transmission.

[0458] In one embodiment, for an NR-U time slot, in which one or more valid ROs are configured in a time slot having a time domain configuration according to a PRACH configuration table of the NR standard specification, one or more LBT slots may be configured in the time slot, wherein each LBT slot consists of one or more consecutively configured valid RACH opportunities in the time slot, and if the corresponding LBT operation performed in the LBT slot before the RO is successful, then the valid RACH opportunity that is not configured as the LBT slot may be used for PRACH transmission.

[0459] In one example, the number of ROs within a LBT gap may be fixed.

[0460] In one example, each LBT gap may be fixed to 1 regardless of the PRACH preamble format and / or the PRACH subcarrier spacing.

[0461] Fig.15 An example LBT gap indication 1500 is shown according to an embodiment of the present disclosure. Fig.15 The illustrated embodiment of the LBT gap indication 1500 is for illustration only. Fig.15 One or more of the components shown may be implemented in dedicated circuits configured to perform the functions described, or one or more of the components may be implemented by one or more processors executing instructions to perform the functions described. Other embodiments may be used without departing from the scope of the present disclosure.

[0462] like Fig.15 As shown, regardless of the configured PRACH preamble format and the corresponding different RO durations of different formats (e.g., formats A1 / A2 / A3), the LBT gap is a RACH opportunity, and LBT is performed within the LBT gap, so that if the LBT can be completed within the LBT gap, the RACH opportunity after the LBT gap can be utilized.

[0463] In one example, the number of ROs of the LBT slot may be varied with respect to different PRACH subcarrier spacings and / or configured PRACH preamble formats.

[0464] In one example, the number of ROs in the LBT gap may depend on both the PRACH subcarrier spacing and the configured PRACH preamble format, where the number of ROs is Where T_LBT is the minimum expected duration of the LBT gap, and T_RO is the duration of each RO that depends on both the PRACH SCS and the configured PRACH format.

[0465] In one example, when CAT-4 LBT with the lowest CAPC value (i.e., 1) is used for PRACH transmission, since CAT-4 LBT with a CAPC value of 1 has a minimum CWS of 3 and a maximum CWS of 7, when CWS is 7, LBT needs to take at least 25+7*9=88μs. LBT =88μs, the corresponding number of ROs in the LBT gap for different PRACH SCS and PRACH formats is provided in Table 24.

[0466] Table 24 PRACH preamble format

[0467] PRACH preamble format PRACH SCS=15kHz PRACH SCS=30kHz A1 / B1 / C0 1 2 A2 / B2 1 1 A3 / B3 / C2 1 1 B4 1 1

[0468] Fig.16 Another example LBT gap indication 1600 is shown according to an embodiment of the present disclosure. Fig.16 The illustrated embodiment of the LBT gap indication 1600 is for illustration only. Fig.16One or more of the components shown may be implemented in dedicated circuits configured to perform the functions described, or one or more of the components may be implemented by one or more processors executing instructions to perform the functions described. Other embodiments may be used without departing from the scope of the present disclosure.

[0469] like Fig.16 As shown in the figure, for the 15kHz SCS, each LBT gap is a RO; while for the 30kHz SCS format A1 / B1 / C0, since the duration of a RO is less than T LBT = 88 μs duration, so 2 ROs can be configured for the LBT gap to meet the LBT gap (i.e., T LBT )’s minimum expected duration.

[0470] In one example, the UE may determine the number of ROs of the LBT gap from the configuration of the PRACH subcarrier spacing and the configured PRACH preamble format according to Table 24.

[0471] In one example, the UE may determine the number of ROs for the LBT gap based on the configuration of the PRACH subcarrier spacing, the configured PRACH preamble format, and the minimum expected duration of the LBT gap, where the minimum expected duration of the LBT gap may be fixed or may be configured by higher layer parameters (e.g., RRC parameters) or DCI.

[0472] In one example, the number of ROs for an LBT gap can be configured directly.

[0473] In one example, the number of ROs used to create an LBT gap may be configured by a higher layer parameter (eg, an RRC parameter).

[0474] In a sub-example, the number of ROs used to create the LBT may be dynamically configured by the PDCCH. For example, the PDCCH command may introduce a field for indicating the number of ROs for the LBT gap.

[0475] Assuming that an LBT slot can be one or more ROs, another design consideration is which ROs within a RACH slot can be designated as LBT slots when multiple ROs exist within a RACH slot.

[0476] In one embodiment, when there is more than one RACH opportunity (RO) within a RACH time slot, and each LBT slot consists of k (k>=1) ROs, then if LBT is successfully completed within the LBT slot from the n×(k+1)+1th RO to the n×(k+1)+kth RO, then the (n+1)×(k+1)th RO (n>=0) and the ROs indexed at 1 can be used for PRACH transmission; and this RO allocation for RO slots and actual PRACH transmission continues until no ROs are available within the RACH time slot.

[0477] In one example, if k1, ie, each LBT slot is 1 RO, then in this case, the odd-indexed ROs within the RACH slot are used for the LBT slot, and the even-indexed ROs within the RACH slot are used for the actual PRACH transmission.

[0478] In one example, this approach can be utilized regardless of the configuration of the RO within the RACH slot (eg, PRACH preamble format, number of ROs within the RACH slot, starting symbol of the first RO within the RACH slot, etc.).

[0479] In one embodiment, when there is more than one RACH opportunity (RO) in a RACH slot, and each LBT slot consists of k (k>=1) ROs, then if LBT is successfully completed in the LBT slot from the n×(k+1)+2th RO to the n×(k+1)+k+1th RO, the 1+(n+1)×(k+1)th RO (n>=0) and the ROs indexed starting at 1 can be used for PRACH transmission; and this RO allocation for RO slots and actual PRACH transmission continues until no RO is available in the RACH slot. In addition, the first RO in the RACH slot is allocated for actual PRACH transmission, and if the LBT process before the RO has been successful, the RO can be utilized.

[0480] In one example, if k1, ie, each LBT slot is 1 RO, then in this case, the even-indexed ROs within the RACH slot are used for the LBT slot, and the odd-indexed ROs within the RACH slot are used for the actual PRACH transmission.

[0481] In one example, this approach can be used regardless of the configuration of the RO in the RACH time slot (eg, PRACH preamble format, number of ROs in the RACH time slot, starting symbol of the first RO in the RACH time slot, etc.).

[0482] In one embodiment, when there is more than one RACH opportunity (RO) in a RACH time slot, one of the examples and / or embodiments mentioned in the present disclosure may be applied depending on the configuration of the RO in the RACH time slot (e.g., PRACH preamble format, number of ROs in the RACH time slot, starting symbol of the first RO in the RACH time slot, etc.).

[0483] In one example, if each LBT gap consists of k=1 ROs, then when there are an even number of valid ROs in the RACH time slot, the examples and / or embodiments mentioned in the present disclosure can be applied; and when there are an odd number of valid ROs in the RACH time slot, the examples and / or embodiments mentioned in the present disclosure can be applied.

[0484] In one sub-example, such an allocation may maximize the number of possible ROs used for actual PRACH transmissions within a RACH slot.

[0485] Fig.17 Yet another example LBT gap indication 1700 is shown according to an embodiment of the present disclosure. Fig.17 The illustrated embodiment of the LBT gap indication 1700 is for illustration only. Fig.17 One or more of the components shown may be implemented in dedicated circuits configured to perform the functions described, or one or more of the components may be implemented by one or more processors executing instructions to perform the functions described. Other embodiments may be used without departing from the scope of the present disclosure.

[0486] In one embodiment, when there is only one RACH opportunity within a RACH slot, the unique RO may be used for actual PRACH transmission.

[0487] In one example, LBT corresponding to a RO may be performed prior to the RO without configuring an explicit LBT gap duration.

[0488] In one example, the examples and / or embodiments mentioned in the present disclosure may be applied to PRACH preamble format B4.

[0489] In one example, the LBT duration corresponding to the LBT can be performed N symbols before the start of the RO corresponding to the LBT gap, where N = ceil (expected LBT duration with CWS W / PRACH symbol duration), and the expected LBT duration with CWS W can be the duration assuming that each step of the backoff is successful, or the duration assuming that each step of the backoff is successful plus a certain protection duration D to merge potential LBT failures during the process.

[0490] Fig.18An example RACH opportunity 1800 in a RACH slot is shown according to an embodiment of the disclosure. Fig.18 The illustrated embodiment of RACH opportunities 1800 in a RACH time slot is for illustration only. Fig.18 One or more of the components shown may be implemented in dedicated circuits configured to perform the functions described, or one or more of the components may be implemented by one or more processors executing instructions to perform the functions described. Other embodiments may be used without departing from the scope of the present disclosure.

[0491] like Fig.18 As shown, 2 symbols are required for LBT, and the RO with the preamble format of B4 starts at symbol 0 and symbol 2 in the RACH time slot respectively.

[0492] Assuming the determination of the LBT slot RO and the PRACH transmission RO within the RACH slot, another design consideration is when LBT can be performed within the LBT slot.

[0493] In one embodiment, PRACH LBT processing within the LBT gap starts at the beginning of the LBT gap.

[0494] In one example, when PRACH LBT processing is completed within the LBT gap, the corresponding PRACH transmission can start at the RO after the end of the LBT gap.

[0495] In a sub-example, this example may be applied with regulatory permission.

[0496] In one example, when PRACH LBT processing is completed within the LBT gap, the corresponding PRACH transmission (i.e., the PRACH transmission that can utilize the RO after the LBT gap) can extend the CP length so that the gap between the start of the PRACH and the end of the completion of the PRACH LBT is at most Tμs.

[0497] In one sub-example, T is 16.

[0498] In another sub-example, T is 25.

[0499] In one example, when PRACH LBT processing is completed within an LBT gap, where the LBT gap is k>1 ROs, and the LBT completion time is within the i-th RO of the LBT gap, where (1<=i<=k-1); then PRACH transmission can start at the i+1-th RO of the LBT gap, and possible CP extension can be applied (for example, according to the examples and / or embodiments mentioned in the present disclosure).

[0500] Fig.19Another example RACH opportunity 1900 in a RACH slot according to an embodiment of the disclosure is shown. Fig.19 The illustrated embodiment of RACH opportunities 1900 in a RACH time slot is for illustration only. Fig.19 One or more of the components shown may be implemented in dedicated circuits configured to perform the functions described, or one or more of the components may be implemented by one or more processors executing instructions to perform the functions described. Other embodiments may be used without departing from the scope of the present disclosure.

[0501] exist Fig.19 An example with k=2 is provided in , where the LBT processing is done within RO1; therefore, the UE can send PRACH at RO2 instead of sending PRACH at RO3 (with possible CP extension).

[0502] In one embodiment, LBT may be performed in N symbols within the LBT gap corresponding to the LBT gap before the start of the RO for actual PRACH transmission, where N = ceil (expected LBT duration with CWS W / PRACH symbol duration), and the expected LBT duration with CWS W may be the duration assuming that each step of the backoff is successful, or the duration assuming that each step of the backoff is successful plus a certain protection duration D to merge potential LBT failures during the process.

[0503] In one embodiment, the PRACH LBT processing performed within the LBT gap may continue until the LBT process is successful and thus the corresponding RO may be used for PRACH transmission; or the end of the LBT gap is reached and the corresponding RO may not be used for PRACH transmission.

[0504] In one embodiment, when all or part of a RACH slot is within a gNB-initiated COT, a CAT-1 / CAT-2 LBT may be performed before each valid RO within a RACH slot within the gNB-initiated COT, and if the LBT is successful, the RO may be used for PRACH transmission.

[0505] In one example, CAT-1 LBT can be used only if the start of the RO and the end of the last DL transmission before the RO are at most 16 μs apart.

[0506] In one example, CAT-1 / CAT-2 LBT may also be performed before a RO configured as an LBT gap, and if the LBT is successful, such a RO may be used for PRACH transmission.

[0507] In one example, the PRACH preamble sent in a RO configured as an LBT gap may be the same as the PRACH preamble that the UE intends to send in a RO configured for an actual PRACH transmission to which the LBT gap corresponds.

[0508] In one example, among (multiple) ROs configured as LBT gaps and corresponding ROs for actual PRACH transmission, the UE may use the first RO through CAT-1 / CAT-2LBT for PRACH transmission, where the same selected PRACH preamble code is applied to (multiple) ROs in the LBT gap and the ROs corresponding to the LBT gaps for actual PRACH transmission.

[0509] In one sub-example, PRACH transmission opportunities may be increased when the RACH slot is within the gNB-initiated COT compared to when the RACH slot is outside the gNB-initiated COT.

[0510] In one example, among the RO(s) configured as LBT gaps and the corresponding ROs used for actual PRACH transmission, the UE may use any RO that passes CAT-1 / CAT-2 LBT for PRACH transmission.

[0511] In one sub-example, the same or different selected PRACH preambles may be applied across RO(s) in the LBT slot and the corresponding ROs used for actual PRACH transmissions.

[0512] In another sub-example, the same or different selected spatial TX parameters may be applied across RO(s) in the LBT slot and the corresponding ROs used for actual PRACH transmissions.

[0513] Fig. 20 Yet another example RACH opportunity 2000 in a RACH slot according to an embodiment of the disclosure is shown. Fig. 20 The illustrated embodiment of a RACH opportunity 2000 in a RACH timeslot is for illustration only. Fig. 20 One or more of the components shown may be implemented in dedicated circuits configured to perform the functions described, or one or more of the components may be implemented by one or more processors executing instructions to perform the functions described. Other embodiments may be used without departing from the scope of the present disclosure.

[0514] like Fig. 20 As shown, the entire RACH timeslot is within the COT initiated by the gNB, and CAT-2LBT can be performed before each valid RO in this RACH timeslot, and if CAT-2LBT is successful, the corresponding RO can be used for PRACH transmission.

[0515] In one embodiment, when all or part of a RACH slot is within a gNB-initiated COT, a CAT-1 / CAT-2 LBT may be performed immediately prior to the RO configured for actual PRACH transmission within the RACH slot; and if the LBT is successful, the RO may be used for PRACH transmission.

[0516] In one embodiment, the mapping of SS / PBCH blocks (SSBs) to valid ROs may be enhanced according to the NR standard specification to support LBT gaps.

[0517] In one example, the SSB index is mapped to the valid RO that is not configured as the LBT slot in the following order: first, within a single valid RO that is not configured as the LBT slot, in the ascending order of the preamble index; second, for the frequency-multiplexed valid RO that is not configured as the LBT slot, in the ascending order of the frequency resource index; third, for the time-multiplexed valid RO that is not configured as the LBT slot within the PRACH time slot, in the ascending order of the time resource index; fourth, for the PRACH time slot, in the ascending order of the index.

[0518] In one sub-example, the RO within the LBT gap can be associated with the same SSB index as the RO used for the actual PRACH transmission corresponding to the LBT gap. For example, this can be used when the RACH timeslot is within the COT initiated by the gNB and therefore CAT-2 LBT can be used.

[0519] In one example, the SSB index is mapped to the effective RO on a RO group basis, wherein the RO group consists of (multiple) ROs configured for the LBT gap and the RO for actual PRACH transmission corresponding to the LBT gap; and the mapping order can be: first, within the RO group, in ascending order of the preamble code index; second, for the frequency-multiplexed RO group, in ascending order of the frequency resource index; third, for the time-multiplexed RO group within the PRACH time slot, in ascending order of the time resource index; fourth, for the PRACH time slot, in ascending order of the index.

[0520] In the present disclosure, a parameter set refers to a set of signal parameters, which may include subframe duration, subcarrier spacing (SCS), cyclic prefix (CP) length, transmission bandwidth (BW), or any combination of these signal parameters.

[0521] After the UE detects the synchronization signal and decodes the broadcasted system information, the UE may initiate a random access process by sending a physical random access channel (PRACH) preamble in the uplink, based on the PRACH configuration which will indicate at which resources the UE is allowed to send PRACH preambles and the PRACH preamble type.

[0522] In NR, there is an association between one or more SS / PBCH blocks and a subset of RACH opportunities (RO). The UE can select a subset of RACH resources through downlink measurements and this association. Contention-based random access (CBRA) in NR is based on a 4-step procedure where the UE first sends a Physical Random Access Channel (PRACH) preamble (Msg1) to the gNB over its selected RACH resources; the gNB replies with a Random Access Response (RAR) in Msg2; then, the UE sends Msg3 in the uplink and the gNB sends Msg4 in the downlink. This random access procedure is supported for both idle mode and connected mode UEs.

[0523] Fig.21A An example RACH procedure 2100 according to an embodiment of the present disclosure is shown. The embodiment of the RACH procedure 2100 shown in FIG. 21 is for illustration only. One or more of the components shown in FIG. 21 may be implemented in a dedicated circuit configured to perform the functions described, or one or more of the components may be implemented by one or more processors executing instructions to perform the functions described. Other embodiments may be used without departing from the scope of the present disclosure.

[0524] exist Fig.21A The general procedure of 4-step RA is shown in . Contention-free random access (CFRA) is also supported for NR, such as for handover and DL data arrival purposes, where a dedicated preamble is assigned to the UE and no contention resolution is required (i.e., Msg4).

[0525] The 2-step Random Access Channel (RACH) procedure is intended to reduce the minimum number of required message transactions to complete the random access procedure for a device to connect to the network as a simplified version of the 4-step RACH. The 4-step RACH is conventional, but it may not always be optimal for services that require short delays or for operation in NR-U. This is due to the inherent delay, which is larger in NR-U due to the LBT requirement before sending a signal at each step in the unlicensed band.

[0526] The 2-step RACH includes the transmission of msg.A from the UE and the transmission of Fig. 21BThe gNB sends msg.B to the UE (as shown in Figure 1). msg.A includes the PRACH preamble and uplink data (PUSCH) for the UE to transmit in the very initial stage, including UE-ID, connection request, etc. After successfully receiving msg.A, the gNB sends msg.B to authorize further transmission of the UE, thereby providing necessary information such as UL grant, RAPID, timing advance, contention resolution, etc.

[0527] Fig. 21B An example RACH procedure 2150 is shown in accordance with an embodiment of the present disclosure. Fig. 21B The embodiment of the RACH procedure 2150 shown in FIG. 2 is for illustration only. Fig. 21B One or more of the components shown may be implemented in dedicated circuits configured to perform the functions described, or one or more of the components may be implemented by one or more processors executing instructions to perform the functions described. Other embodiments may be used without departing from the scope of the present disclosure. Fig. 21B The 2-step RACH process is shown in FIG.

[0528] The basic principle of the preamble itself for two-step RACH does not need to be distinguished from the existing (i.e., NR preamble format / sequence for four-step RACH). The uplink data as part of msg.A is transmitted on the pre-allocated resources at the first step of the RACH procedure, which is done at the third step of the four-step RACH procedure. The pre-allocated resources msg.APUSCH are shared by multiple UEs attempting random access.

[0529] Details about the resources used for msg.A transmission (including resource size, modulation order and coding rate, DM-RS information, etc.) can be known (signaled) to all UEs before they attempt random access. If the gNB successfully receives and decodes msg.A, the gNB responds with msg.B, which can be understood as a combination of msg 2 and msg 4 in the four-step RACH process. By reducing the steps in half, the initial access delay can be shortened to meet the service requirements of specific service types.

[0530] NR supports PRACH preambles with a long sequence length of L = 839 symbols and a subcarrier spacing (SCS) of 1.25kHz or 5kHz, or a short sequence length of L = 139 symbols and a PRACH preamble with an SCS of 15, 30, 60 or 120kHz. Specifically, for short preamble sequences, NR supports the transmission of multiple / repeated preamble sequences to enhance coverage, or to support gNB receiver beam scanning, and CP / GP is also required.

[0531] Fig. 22An example general structure 2200 of a short preamble according to an embodiment of the present disclosure is shown. Fig. 22 The embodiment of the general structure 2200 of the short preamble shown in FIG. 2 is for illustration only. Fig. 22 One or more of the components shown may be implemented in dedicated circuits configured to perform the functions described, or one or more of the components may be implemented by one or more processors executing instructions to perform the functions described. Other embodiments may be used without departing from the scope of the present disclosure.

[0532] Fig. 22 The general structure of the short preamble format is shown, and the preamble format for the short sequence length of 15kHz subcarrier spacing supported in the detailed NR is shown in Table 25. In Table 25, the unit is Ts, where Ts=1 / 30.72MHz, and for data with the same parameter set, the PRACH preamble is aligned with the OFDM symbol boundary. For format A, the GP can be defined within the last RACH preamble among the consecutively transmitted RACH preambles. For other SCS values ​​(e.g., 30, 60, and 120kHz), the preamble format can be defined by scaling Ts according to the SCS similar to Table 25.

[0533] Table 25 Preamble format

[0534] PRACH format Serial Number TCP TSEQ TGP A1 2 288 4096 0 A2 4 576 8192 0 A3 6 864 12288 0 B1 2 192 4096 96 B2 4 360 8192 216 B3 6 504 12288 360 B4 12 936 24576 792 C0 1 1240 2048 1096 C2 4 2048 8192 2912

[0535] In order to operate NR in unlicensed spectrum, unlicensed spectrum regulations such as listen before talk (LBT), occupied channel bandwidth (OCB) regulations and power spectral density (PSD) regulations need to be met across different unlicensed bands and different regions. For example, ETSI regulations in the 5GHz unlicensed band and 60GHz require LBT before authorized channel access. Assuming the requirement of LBT, each message of the NR-U random access procedure is not guaranteed to have channel access at a predefined and / or scheduled time and frequency resource, thereby potentially increasing the overall random access delay. In addition, due to the LBT requirement, additional resource overhead may also be incurred for the NR-U random access procedure.

[0536] As a result, the present disclosure focuses on enhancements to the random access procedure for unlicensed bands (NR-Unlicensed, referred to as NR-U), and also considers reducing the steps to perform random access in these bands, which is the so-called two-step random access procedure. Note that the enhancements in the present disclosure can be applied to both the CBRA and CFRA (if applicable) procedures of NR-U.

[0537] The LBT provision in unlicensed bands requires the UE and gNB to perform LBT operations before each transmission. Specifically, LBT may be performed before the transmission of an authorized PRACH. One design consideration is which types of LBT related LBT procedures for PRACH transmissions may be performed. Potential LBT procedures are listed below as examples and / or embodiments.

[0538] In one embodiment, the LBT for PRACH may be a single LBT of fixed duration. In one example, the LBT duration may have a PIFS duration of a coexisting Wi-Fi system, which may be 25 μs for NR-U systems below 7 GHz and / or 8 μs for NR-U systems above 7 GHz. In one sub-embodiment, a single LBT may be used to transmit PRACH if the corresponding RACH opportunity is within the channel occupancy time (COT) obtained by the gNB (such as through CAT-4 LBT). In another sub-embodiment, a single LBT may be supported for transmitting PRACH outside the COT of a gNB associated with, for example, CAT-4 LBT.

[0539] In one embodiment, LBT for PRACH may follow Category 4 (CAT-4) LBT of LTE-LAA, which is a random backoff LBT with a variable-sized contention window size (CWS).

[0540] In one sub-embodiment, CAT-4 LBT specified for NR-U PRACH may have a higher priority class, such as LBT priority class 1 with a minimum CWS of 3 and a maximum CWS of 7.

[0541] In one sub-embodiment, the CWS adaptation rules for PRACH transmissions depend on the design of the remaining random access procedures. In one example, if RAR transmission is also subject to LBT, the UE may not be able to receive RAR due to gNB LBT failure, in which case the CWS for PRACH is not increased. In another example, if the UE detects RAR, but the contention resolution message (i.e., Msg4) indicates that the gNB did not correctly detect PRACH (e.g., due to a collision), the UE increases the CWS for PRACH retransmissions. In another example, if the UE successfully completes the 4-step RA procedure, the CWS for PRACH is reset to the minimum value for future PRACH transmissions.

[0542] In one embodiment, LBT for PRACH may follow Category 3 (CAT-3) LBT of LTE-LAA, which is LBT with random backoff with fixed CWS.

[0543] The LBT procedure defined above may also be used to authorize transmissions other than PRACH, such as Msg2 / Msg3 / Msg4 during the RA procedure.

[0544] The configuration of the PRACH LBT process, including the LBT type and / or at least one of the corresponding parameters of each LBT type (for example, including at least an energy detection threshold, and / or an LBT priority class for CAT-4 LBT (if specified / configured), and / or one of CWS and / or MCOT for CAT-3 LBT), can be indicated as follows (note that some configurations may use different embodiments).

[0545] In one embodiment, the PRACH LBT configuration or partial configuration may be indicated by higher layer parameters, such as by SystemInformationBlockType1 (SIB1) from the RRC layer or SIB1 in addition to SIB1.

[0546] In one embodiment, the PRACH LBT configuration or partial configuration may be indicated by layer 1 signaling. In one example, the PRACH LBT configuration may be indicated by PBCH.

[0547] In one embodiment, the PRACH LBT configuration or partial configuration may be indicated in the PRACH configuration table. In one example, this may be applied to a scenario with a single LBT.

[0548] In one embodiment, the PRACH LBT configuration or partial configuration may be fixed by specification.

[0549] In one embodiment, the PRACH LBT configuration or partial configuration may depend on the UE implementation.

[0550] In one embodiment, the spatial RX parameters for LBT operation of PRACH may be omni-directional, or quasi-omni-directional, or directional (e.g., the expected spatial TX filter for PRACH transmission). In one sub-embodiment, the directionality of the spatial RX parameters for PRACH LBT may be different at different unlicensed bands, such as omni-directional for NR-U below 7 GHz and quasi-omni-directional or directional for NR-U above 7 GHz. In another sub-embodiment, the directionality of the spatial RX parameters for PRACH LBT may be determined by the UE implementation.

[0551] Another design consideration regarding the frequency domain bandwidth over which NR-U PRACH LBT is performed. In one embodiment, NR-U PRACH LBT may be performed on an initial UL bandwidth part (BWP) for each UE. In another embodiment, NR-U PRACH LBT may be performed on the entire UL system bandwidth. In another embodiment, NR-U PRACH LBT may be performed on a nominal channel bandwidth of an unlicensed band, which may be defined below. In yet another embodiment, NR-U PRACH LBT may be performed on frequency resources over which PRACH may be sent within the UL BWP; this option may increase the multiplexing capacity of PRACH.

[0552] In the present disclosure, a method for successfully applying a random access process (RACH procedure) in an unlicensed band while considering a timing advance value is disclosed. In addition, assuming the requirement of LBT behavior, a RACH with reduced steps, i.e., a two-step RACH, is considered. Similarly, the two-step RACH includes msg.A transmission from the UE and msg.B transmission from the gNB, where msg.A is the focus of the present disclosure. For ease of description, in the present disclosure, msg.A includes a preamble transmission and an uplink data transmission (PUSCH), and the resources in which the preamble can be sent are referred to as RO (RACH opportunity), and the resources in which the uplink data (PUSCH) can be sent are referred to as PO (PUSCH opportunity).

[0553] However, the uplink data to be sent in msg.A is not limited to PUSCH, but can be extended to cover any type of uplink channel that the UE wishes to transmit to the network during the random access phase, including physical uplink control channels and physical uplink sidelink channels. There can be multiple ROs and POs in a cell.

[0554] In one embodiment, a PRACH preamble format and T for msg.A in an unlicensed band are provided. gap .

[0555] Fig.23A An example timing gap 2300 between RO and PO for two-step RACH is shown according to an embodiment of the disclosure. Fig.23A The embodiment of timing slot 2300 shown is for illustration only. Fig.23A One or more of the components shown may be implemented in dedicated circuits configured to perform the functions described, or one or more of the components may be implemented by one or more processors executing instructions to perform the functions described. Other embodiments may be used without departing from the scope of the present disclosure.

[0556] Fig. 23BAn example timing gap 2350 between RO and PO for two-step RACH is shown according to an embodiment of the disclosure. Fig. 23B The embodiment of timing gap 2350 shown in is for illustration only. Fig. 23B One or more of the components shown may be implemented in dedicated circuits configured to perform the functions described, or one or more of the components may be implemented by one or more processors executing instructions to perform the functions described. Other embodiments may be used without departing from the scope of the present disclosure.

[0557] For two-step RACH in NR-U, it may be supported to enable msg.A PUSCH transmission without LBT, otherwise the benefit of two-step RACH may be reduced because it may take up to a similar amount of time as that required for four-step RACH. Therefore, msg.A PUSCH can be sent immediately after the PRACH preamble transmission on RO with the minimum required timing gap. Fig.23A and Fig. 23B The placement of the PRACH preamble and msg.A PUSCH transmission in the time domain is shown.

[0558] For the PRACH preamble format, the PRACH preamble may have an LBT time gap (T) before the UE sends the PRACH preamble and cyclic prefix (CP), preamble and guard time (GT). LBT ). The CP is determined by the supported cell coverage and the preamble length is chosen by the gNB, both of which may be specified in the specification. The GT is placed to protect the subsequent uplink data so that the PRACH preamble does not interfere with the PUSCH starting at the end of the RACH preamble transmission. The UE attempting random access is muted during the time GT, and depending on the preamble format of the NR specification and / or the position of the RO in the timeslot, the GT may not be explicitly present. When adjacent symbols are allocated for PRACH preamble transmission, no GT is required since the CP of the next symbol of the preamble acts as the GT. This is the design principle of PRACH preamble format A / B in 3GPP NR.

[0559] Therefore, for a two-step RACH network, a timing gap (T G ) to protect the subsequent PUSCH transmission from interference with the PRACH preamble. If the GT (T GT ) is sufficient to protect the subsequent PUSCH transmission, then T G Can be set to zero. On the other hand, when the following situation, the GT (T GT) in addition to the timing gap: the UE changes the subcarrier spacing used for msg.A transmission to be different from the subcarrier spacing for preamble transmission; and / or the UE changes the waveform used for msg A PUSCH transmission to be different from the waveform for preamble transmission.

[0560] The timing interval T G and GT(T GT ) is the duration in which no uplink signal is transmitted, which may allow other devices to occupy the channel if the device determines that the channel is empty, resulting in blocking or failure of the PUSCH transmission of msg.A. Therefore, GT(T GT ) and T G The total time ( Fig.23A and Fig. 23B T GAP ) can be small enough so that other devices cannot determine that the channel is empty while supporting the intended functionality, avoiding interference to msg.A PUSCH, and allowing msg.A PUSCH preparation time. G or T GAP The value can be configured by network signaling.

[0561] In the following, we will describe how to set and notify T G or T GAP value.

[0562] In such Fig.23A In one embodiment shown, it is assumed that the preamble format notified for RO may or may not have the time (T GT ), T GT Without being explicitly indicated, network notifications can be set to zero T G The value of T G is calculated from the end of the preamble format while also taking into account the GT. The notified preamble format can be any of the formats A, B, or C in the 3GPP NR specification, and for format A, GT(T GT ) can be zero. T G Indicates the start time of the msg.A PUSCH at the end of the PRACH preamble transmission. With the notified T G The UE uses this value to count when to start sending msg.A PUSCH. At the same time, the total timing interval T can be guaranteed. GAP Other devices are not allowed to decide that the channel is empty.

[0563] In such Fig. 23B In one embodiment shown, in order not to cause any mismatch between the UE and the gNB, the gNB provides a GT (T GT ) Gvalue, so that the UE can start from the end of the PRACH preamble transmission with a timing interval T G To start msg.A PUSCH transmission. UE does not need to care about the GT (T GT ), and can also ensure the timing gap T G Other devices are not allowed to decide that the channel is empty.

[0564] In one embodiment, the impact of the timing advance value from the PRACH preamble code on the LBT result is provided.

[0565] The network indicates the timing advance to the UE that has completed the random access procedure, the amount of time that the UE must adjust when sending uplink data. The timing advance value is usually provided during the random access procedure, i.e. the timing advance value is included in msg.2 (e.g., random access response) in the four-step RACH. In other words, uplink transmission timing adjustment does not apply to random access preamble and msg.A PUSCH transmissions during the RACH procedure.

[0566] Fig.24 Example RACH preamble transmission interference 2400 is shown according to an embodiment of the disclosure. Fig.24 The illustrated embodiment of RACH preamble transmission interference 2400 is for illustration only. Fig.24 One or more of the components shown may be implemented in dedicated circuits configured to perform the functions described, or one or more of the components may be implemented by one or more processors executing instructions to perform the functions described. Other embodiments may be used without departing from the scope of the present disclosure.

[0567] Fig.24 Depicted is the potential interference of a RACH preamble to the LBT performance of a subsequent UE. In licensed bands, a guard time (GT) can be inserted to protect the subsequent adjacent PUSCH transmission, and the GT works well with a GT at the end of the PRACH preamble and a CP of the PUSCH symbol. However, for operation in unlicensed bands where LBT is required, having only a GT at the end of the PRACH preamble and a CP in front of the PUSCH symbol in the subsequent slot may not be a remedy for interference for UEs transmitting PUSCH / PUCCH in the very next slot after RACH, because the minimum duration of LBT is much larger, which means additional time at the end of the slot where the RO is located to mute the UE attempting RACH.

[0568] In other words, the network can ensure that a silent period is assigned at the end of the last RO in a time slot adjacent to the next time slot or the next scheduled PUSCH / PUCCH transmission. If the time slot where the RO is located is adjacent to another time slot starting with the RO, no additional silent period or timing gap assignment is required.

[0569] Fig.25 An example gap placement time (GAP) 2500 is shown in accordance with an embodiment of the present disclosure. Fig.25 The embodiment of gap placement time (GAP) 2500 shown in FIG. 2 is for illustration only. Fig.25 One or more of the components shown may be implemented in dedicated circuits configured to perform the functions described, or one or more of the components may be implemented by one or more processors executing instructions to perform the functions described. Other embodiments may be used without departing from the scope of the present disclosure.

[0570] Fig.25 The configuration of a timing gap at the end of a time slot (eg, overlapping with the last RO in the time slot) is shown, where the timing gap is also referred to as the silent time in the figure (eg, T M ). During the silent period, the UE attempting random access is not allowed to send any signal. In one consideration, the embodiments and / or examples provided in the present disclosure may not be limited to being applied only to the two-step RACH, but may be applied to a general random access procedure in an unlicensed band.

[0571] In one embodiment, the effect of the timing advance value sent from msg.A on the LBT result is provided.

[0572] Fig.26 Example PUSCH transmission interference 2600 is shown according to an embodiment of the present disclosure. Fig.26 The illustrated embodiment of PUSCH transmission interference 2600 is for illustration only. Fig.26 One or more of the components shown may be implemented in dedicated circuits configured to perform the functions described, or one or more of the components may be implemented by one or more processors executing instructions to perform the functions described. Other embodiments may be used without departing from the scope of the present disclosure.

[0573] Fig.26 It shows the LBT performance of Msg.A PUSCH transmission interfering with the PUSCH / PUCCH scheduled adjacent to PO.

[0574] For the same reason as sending msg.A PUSCH without applying the timing advance value, msg.A PUSCH may interfere with the LBT performance of subsequent PUSCH / PUCCH transmissions scheduled immediately adjacent to msg.A PUSCH transmission, such as Fig.26 shown.

[0575] For UEs attempting msg.A PUSCH transmission, setting a silent period at the end of msg.A PUSCH can be supported. In other words, the network can ensure that a silent period is assigned at the end of msg.APUSCH adjacent to the next time slot or the next scheduled PUSCH / PUCCH transmission. If the time slot where RO and PO are located is adjacent to another time slot starting with RO and / or PO, no additional silent period or time interval assignment is required.

[0576] Fig. 27 An example gap period (GAP) 2700 is shown in accordance with an embodiment of the disclosure. Fig. 27 The illustrated embodiment of placement quiet period (GAP) 2700 is for illustration only. Fig. 27 One or more of the components shown may be implemented in dedicated circuits configured to perform the functions described, or one or more of the components may be implemented by one or more processors executing instructions to perform the functions described. Other embodiments may be used without departing from the scope of the present disclosure.

[0577] Fig. 27 The configuration of the muting time at the end of the last RO in a slot is shown. During the muting period, a UE attempting random access is not allowed to send any signal.

[0578] In one embodiment, a duration, T, for setting silence associated with LBT operation is provided. M The value of .

[0579] T TA The value depends on the cell coverage and is different for each UE based on location and / or distance from the serving gNB. In addition, the T TA The maximum value of T M In order not to block the channel access of other UEs, a setting of T M The method can be as follows: M =max{T TA , T LBT},in, and where N is the number of UEs in the cell, and T TA,i and T LBT,i is the timing advance value and LBT time of UEi.

[0580] The above setting T MThe method is very conservative to protect the scheduled PUSCH / PUCCH transmission and may lead to inefficient resource utilization. On the other hand, in order to effectively utilize radio resources, LBT requirements can be utilized by regulations / specifications. In the current specifications / regulations, the UE is required to perform LBT at the LBT time (T LBT ), and the detected energy levels are measured / accumulated at specific durations before and after the LBT duration, such as Fig.28 As shown in A and B.

[0581] Fig.28 An example scheduled PUSCH transmission 2800 is shown according to an embodiment of the present disclosure. Fig.28 The embodiment of the scheduled PUSCH transmission 2800 shown in FIG. 2 is for illustration only. Fig.28 One or more of the components shown may be implemented in dedicated circuits configured to perform the functions described, or one or more of the components may be implemented by one or more processors executing instructions to perform the functions described. Other embodiments may be used without departing from the scope of the present disclosure.

[0582] For example, this can be exploited when the scheduled PUSCH transmission can share the channel occupancy time initiated by the gNB, so that the UE can send a PUSCH transmission with a deterministic duration (e.g. Fig.28 T LBT ) for the scheduled PUSCH of CAT-2 LBT. Which result of the detected energy level is used for the LBT result (detected energy in A or B) level depends on the UE implementation.

[0583] However, in the present disclosure, rather than leaving the choice to the UE implementation, the UE is required to collect the detected energy level using a specific part of the LBT duration by: notifying from the gNB which part to use, e.g., the front part or the rear part (preferably the rear part); or by specification that the UE can use the rear part when the UE needs to perform LBT for uplink transmissions (PUSCH and / or PUSCH) just after RO or PO.

[0584] In the following, it is disclosed how to set T to minimize resource inefficiency. M If: the starting position of the second part of the energy detection period (e.g., Fig.28 B) is later than T TA In other words, T TA equal to or less than the starting position of B within the LBT duration; and / or forcing the UE to collect / detect the second part (e.g., Fig.28 The energy of other signals on B) in the M Can be set to zero or very small.

[0585] Fig.29 Another example of a scheduled PUSCH transmission 2900 according to an embodiment of the present disclosure is shown. Fig.29 The embodiment of the scheduled PUSCH transmission 2900 shown in FIG. 2 is for illustration only. Fig.29 One or more of the components shown may be implemented in dedicated circuits configured to perform the functions described, or one or more of the components may be implemented by one or more processors executing instructions to perform the functions described. Other embodiments may be used without departing from the scope of the present disclosure.

[0586] In addition, if T TA like Fig.29 If the value is large, the gNB can set the duration of the silent time to T M Set to non-zero to protect the LBT performance of the (scheduled) PUSCH / PUCCH transmission on the next time slot. If the UE is forced to transmit only in the second part (e.g. Fig.28 If the energy of other signals is collected / detected on B) in the figure, the amount of time spent in silence can be minimized. Then, T M ≥T A -T B，starting time .

[0587] In one embodiment, the LBT bandwidth is much larger than the preamble / data transmission bandwidth.

[0588] In the current NR-U discussion and wireless systems in unlicensed bands, the bandwidth of LBT (or CCA) and the transmission bandwidth are the same or similar. For example, in the 802.11n / ac WLAN system, all stations perform CCA on at least 20MHz, and their data transmission bandwidth is in units of 20MHz, so there is no difference between the CCA bandwidth and the data transmission bandwidth. On the other hand, the cellular system uses dynamic resource allocation and adaptation, and the UE shares the entire system bandwidth, so that the UE can transmit a portion of the system bandwidth.

[0589] With this in mind, further clarification can be given to the UE behavior in NR UEs, especially at very high frequencies (such as above 60 GHz). It may be difficult to justify that an NR-U UE performs LBT on only a small portion of the bandwidth in order to protect existing in-use signals or coexist with WiFi devices.

[0590] At the same time, the NR-U system can still be based on NR with dynamic MCS / bandwidth adaptation, and the PRACH preamble and / or msg.A PUSCH may not occupy the entire minimum LBT bandwidth. In other words, (scheduled) PUSCH / PUCCH and RO / PO can be frequency-division multiplexed within the system bandwidth / LBT bandwidth.

[0591] In this environment, TA adjustments to uplink transmissions of connected UEs can potentially block channel access for UEs attempting random access, such as Fig.30 shown.

[0592] Fig.30 A scheduled PUSCH transmission 3000 according to yet another example of an embodiment of the present disclosure is shown. Fig.30 The embodiment of the scheduled PUSCH transmission 3000 shown in FIG. 3 is for illustration only. Fig.30 One or more of the components shown may be implemented in dedicated circuits configured to perform the functions described, or one or more of the components may be implemented by one or more processors executing instructions to perform the functions described. Other embodiments may be used without departing from the scope of the present disclosure.

[0593] Even if the resources used for uplink data and random access transmission are frequency-division multiplexed, the timing-advanced PUSCH / PUCCH transmission on non-overlapping frequency resources with RO / PO affects the LBT performance of the random access channel because the random access UE also needs to perform LBT on a bandwidth larger than the bandwidth of the preamble / msg.A PUSCH.

[0594] like Fig.31 and Fig.32 As shown, potential solutions for LBT by postponing scheduled transmission or extending PUSCH / PUCCH transmission are disclosed below.

[0595] Fig.31 A scheduled PUSCH transmission 3100 according to yet another example of an embodiment of the present disclosure is shown. Fig.31 The embodiment of the scheduled PUSCH transmission 3100 shown in FIG. 3 is for illustration only. Fig.31 One or more of the components shown may be implemented in dedicated circuits configured to perform the functions described, or one or more of the components may be implemented by one or more processors executing instructions to perform the functions described. Other embodiments may be used without departing from the scope of the present disclosure.

[0596] Fig.32 A scheduled PUSCH transmission 3200 according to yet another example of an embodiment of the present disclosure is shown. Fig.32The embodiment of the scheduled PUSCH transmission 3200 shown in FIG. 3 is for illustration only. Fig.32 One or more of the components shown may be implemented in dedicated circuits configured to perform the functions described, or one or more of the components may be implemented by one or more processors executing instructions to perform the functions described. Other embodiments may be used without departing from the scope of the present disclosure.

[0597] exist Fig.31 One embodiment of deferring uplink transmission is shown in FIG. 1. Because each UE has information about RO and PO resource allocations, and when UEs are scheduled with RO / PO in a frequency division multiplexing manner, the scheduled UEs can defer uplink transmissions until the random access UE completes the LBT and starts transmitting immediately after the end of the LBT for random access. When the UE defers transmission, the resources can be punctured or rate matched up to Fig.31 The amount of time delayed is shown.

[0598] exist Fig.32 Another embodiment is described in , where the (scheduled) PUSCH / PUCCH resources may be muted while the random access UEs perform LBT and then start transmitting at the end of the LBT. Alternatively, UEs scheduled for transmission of PUSCH / PUCCH co-scheduled with RO / PO in a frequency division multiplexed manner may be notified to perform LBT for a longer duration until the random access UEs complete their LBT.

[0599] In one embodiment, the LBT bandwidth and the PRACH preamble code bandwidth are the same, and the transmission bandwidth of msg A PUSCH is smaller than the PRACH preamble code transmission bandwidth.

[0600] Unlicensed spectrum at ultra-high frequencies (such as frequencies above 60 GHz) may be ready for release in the near future, and as the carrier frequency becomes higher, the subcarrier spacing may be larger due to the shorter coherence time at the higher frequency range. The 3GPP NR standard specification has defined subcarrier spacings of 60 kHz and 120 kHz for higher carrier frequencies, and the higher carrier frequencies can be applied not only to data transmission but also to PRACH preamble transmission. Assuming a subcarrier spacing of 60 kHz with four repetitions of length 139, the preamble transmission bandwidth becomes 33.360 MHz, which is approximately 48 RBs with a subcarrier spacing of 60 kHz.

[0601] The purpose of sending the PRACH preamble over such a large bandwidth is to meet the requirement as described above to occupy a certain amount of resources, however allocating 48 RBs for msg.A PUSCH may be difficult to justify since resources may be shared by multiple UEs anonymously, modulation and coding rates may be highly constrained, and the receiver (gNB) may need to (partially) blindly detect / decode the received signal. Therefore, allocating a large bandwidth for msg.A PUSCH transmission may not be a good choice, but may be limited.

[0602] On the other hand, in order to make full use of the reduced-step RACH process, msg.A PUSCH can be sent immediately after the PRACH preamble is sent in the preconfigured timing interval T G If the msg.A PUSCH transmission is consistent with the LBT for the (scheduled) PUSCH / PUCH, the msg.A PUSCH transmission may block the scheduled PUSCH / PUCCH transmission of the UE, such as Fig.33 shown.

[0603] Fig.33 A scheduled PUSCH transmission 3300 according to yet another example of an embodiment of the present disclosure is shown. Fig.33 The embodiment of the scheduled PUSCH transmission 3300 shown in FIG. 3 is for illustration only. Fig.33 One or more of the components shown may be implemented in dedicated circuits configured to perform the functions described, or one or more of the components may be implemented by one or more processors executing instructions to perform the functions described. Other embodiments may be used without departing from the scope of the present disclosure.

[0604] Therefore, at least at the time slot or timing instance where msg.A PUSCH and scheduled PUSCH / PUCCH can be multiplexed, the LBT type or LBT duration for the scheduled PUSCH / PUCCH transmission can be set differently than on other time slots, which can be set separately and notified as part of the system information so that the duration can be equal to or less than the timing gap T G .

[0605] In one embodiment, signaling or enforcement is provided for the scheduled UE to measure the T G The energy / interference level of the front side of the LBT duration for the duration of the LBT. This information can also be notified as part of the system information.

[0606] Fig.34 A flowchart of a method 3400 for NR unlicensed wideband PRACH configuration according to an embodiment of the present disclosure is shown, which may be performed by a UE (e.g., Figure 1 111-116) as shown. Fig.34 The embodiment of method 3400 shown is for illustration only. Fig.34 One or more of the components shown may be implemented in dedicated circuits configured to perform the functions described, or one or more of the components may be implemented by one or more processors executing instructions to perform the functions described. Other embodiments may be used without departing from the scope of the present disclosure.

[0607] like Fig.34 As shown, method 3400 starts at step 3402. In step 3402, the UE receives a high-level parameter set from a base station (BS), the high-level parameter set including a subcarrier spacing of a physical random access channel (PRACH) preamble code, a logical root index (i log ) and index (zeroCorrelationZoneConfg).

[0608] In one embodiment, the high-layer parameter set also includes information for configuring a gap for performing a listen-before-talk (LBT) process before sending a PRACH preamble, and the gap for performing the LBT process is determined as a RACH opportunity with an even index, and the PRACH preamble is sent in the next RACH opportunity with an odd index.

[0609] Then, in step 3404, the UE determines the sequence length (L) of the PRACH preamble code based on the subcarrier spacing of the PRACH preamble code. RA ).

[0610] In one embodiment, when the subcarrier spacing of the PRACH preamble is 15 kHz, the sequence length (L RA ) is set to 1151; and when the subcarrier spacing of the PRACH preamble code is 30kHz, the sequence length (L RA ) is set to 571.

[0611] In this embodiment, when L RA =1151, the cyclic shift is determined as: when the index (zeroCorrelationZoneConfg) is 0, N CS =0; when the index (zeroCorrelationZoneConfg) is 1, N CS =17; when the index (zeroCorrelationZoneConfg) is 2, N CS =20; when the index (zeroCorrelationZoneConfg) is 3, N CS=25; when the index (zeroCorrelationZoneConfg) is 4, N CS =30; when the index (zeroCorrelationZoneConfg) is 5, N CS =35; when the index (zeroCorrelationZoneConfg) is 6, N CS =44; when the index (zeroCorrelationZoneConfg) is 7, N CS =52; when the index (zeroCorrelationZoneConfg) is 8, N CS =63; when the index (zeroCorrelationZoneConfg) is 9, N CS =82; when the index (zeroCorrelationZoneConfg) is 10, N CS =104; when the index (zeroCorrelationZoneConfg) is 11, N CS =127; when the index (zeroCorrelationZoneConfg) is 12, N CS =164; when the index (zeroCorrelationZoneConfg) is 13, N CS =230; when the index (zeroCorrelationZoneConfg) is 14, N CS =383; and when the index (zeroCorrelationZoneConfg) is 15, N CS =575.

[0612] In this embodiment, when L RA =571, the cyclic shift is N CS Determined as follows: When the index (zeroCorrelationZoneConfg) is 0, N CS =0; when the index (zeroCorrelationZoneConfg) is 1, N CS =8; when the index (zeroCorrelationZoneConfg) is 2, N CS =10; when the index (zeroCorrelationZoneConfg) is 3, N CS =12; when the index (zeroCorrelationZoneConfg) is 4, N CS =15; when the index (zeroCorrelationZoneConfg) is 5, NCS =17; when the index (zeroCorrelationZoneConfg) is 6, N CS =21; when the index (zeroCorrelationZoneConfg) is 7, N CS =25; when the index (zeroCorrelationZoneConfg) is 8, N CS =31; when the index (zeroCorrelationZoneConfg) is 9, N CS =40; when the index (zeroCorrelationZoneConfg) is 10, N CS =51; when the index (zeroCorrelationZoneConfg) is 11, N CS =63; when the index (zeroCorrelationZoneConfg) is 12, N CS =81; when the index (zeroCorrelationZoneConfg) is 13, N CS =114; when the index (zeroCorrelationZoneConfg) is 14, N CS =190; and when the index (zeroCorrelationZoneConfg) is 15, N CS =285.

[0613] Then, in step 3406, the UE determines the root index based on the logical root index (i log ) to determine the physical root index (i) of the PRACH preamble phy ).

[0614] In one embodiment, for a logical root index i log =2·i, the physical root index (i phy ) is determined as i phy =i-1, and for the logical root index i log =2·i+1, the physical root index (i phy ) is determined as i phy =L RA -i-1, where 0≤i≤(L RA -1) / 2-1.

[0615] Then, in step 3408, the UE determines the cyclic shift (N CS ).

[0616] Next, in step 3410, the UE determines the sequence length L based on the determined sequence length L. RA , the determined physical root index i phy and the determined cyclic shift N CS To generate the PRACH preamble code.

[0617] Finally, in step 3412, the UE sends a PRACH preamble code to the base station (BS) through the shared spectrum channel.

[0618] Fig.35 A base station (BS) according to an embodiment of the present disclosure is shown.

[0619] The gNB, eNB, or BS described above may correspond to the BS 3500. For example, Figure 2 The gNB 102 shown may correspond to BS 3500.

[0620] refer to Fig.35 BS 3500 may include a processor 3510, a transceiver 3520, and a memory 3530. However, not all of the components shown are required. BS 3500 may include a processor 3510, a transceiver 3520, and a memory 3530. Fig.35 Furthermore, according to another embodiment, the processor 3510, the transceiver 3520, and the memory 3530 may be implemented as a single chip.

[0621] The aforementioned components will now be described in detail.

[0622] The processor 3510 may include one or more processors or other processing devices that control the proposed functions, processes and / or methods. The operations of the gNB 3500 may be implemented by the processor 3510.

[0623] The processor 3510 may detect the PUCCH on the configured control resource set. The processor 3510 may determine a method for dividing the CB and a method for rate matching of the PUSCH according to the PUCCH. The processor 3510 may control the transceiver 3520 to receive the PUSCH according to the PUCCH. The processor 3510 may generate HARQ-ACK information according to the PUSCH. The processor 3510 may control the transceiver 3520 to send the HARQ-ACK information.

[0624] The transceiver 3520 may include an RF transmitter for up-converting and amplifying a transmission signal, and an RF receiver for down-converting the frequency of a reception signal. However, according to another embodiment, the transceiver 3520 may be implemented by more or less components than those shown in the components.

[0625] The transceiver 3520 may be connected to the processor 3510 and transmit and / or receive signals. The signals may include control information and data. In addition, the transceiver 3520 may receive signals through a wireless channel and output the signals to the processor 3510. The transceiver 3520 may transmit signals output from the processor 3510 through a wireless channel.

[0626] The memory 3530 may store control information or data included in a signal obtained by the gNB 3500. The memory 3530 may be connected to the processor 3510 and store at least one instruction or protocol or parameter for the proposed function, process and / or method. The memory 3530 may include a read-only memory (ROM) and / or a random access memory (RAM) and / or a hard disk and / or a CD-ROM and / or a DVD and / or other storage devices.

[0627] Fig.36 A user equipment (UE) according to an embodiment of the present disclosure is shown.

[0628] The UE described above may correspond to UE 3600. For example, Figure 3 The UE 116 shown may correspond to UE 3600 .

[0629] refer to Fig.36 UE 3600 may include a processor 3610, a transceiver 3620, and a memory 3630. However, not all of the components shown are required. UE 3600 may include a processor 3610, a transceiver 3620, and a memory 3630. Fig.36 Furthermore, according to another embodiment, the processor 3610, the transceiver 3620, and the memory 3630 may be implemented as a single chip.

[0630] The above-mentioned components will now be described in detail.

[0631] The processor 3610 may include one or more processors or other processing devices that control the proposed functions, processes and / or methods. The operations of the UE 3600 may be implemented by the processor 3610.

[0632] The processor 3610 may detect the PDCCH on the configured control resource set. The processor 3610 may determine the method for dividing the CB and the rate matching method for the PDSCH according to the PDCCH. The processor 3610 may control the transceiver 3620 to receive the PDSCH according to the PDCCH. The processor 3610 may generate HARQ-ACK information according to the PDSCH. The processor 3610 may control the transceiver 3620 to send the HARQ-ACK information.

[0633] The transceiver 3620 may include an RF transmitter for up-converting and amplifying a transmission signal, and an RF receiver for down-converting the frequency of a reception signal. However, according to another embodiment, the transceiver 3620 may be implemented by more or less components than those shown in the components.

[0634] The transceiver 3620 may be connected to the processor 3610 and transmit and / or receive signals. The signals may include control information and data. In addition, the transceiver 3620 may receive signals through a wireless channel and output the signals to the processor 3610. The transceiver 3620 may transmit signals output from the processor 3610 through a wireless channel.

[0635] The memory 3630 may store control information or data included in a signal obtained by the UE 3600. The memory 3630 may be connected to the processor 3610 and store at least one instruction or protocol or parameter for the proposed function, process and / or method. The memory 3630 may include a read-only memory (ROM) and / or a random access memory (RAM) and / or a hard disk and / or a CD-ROM and / or a DVD and / or other storage devices.

[0636] Fig.37 A flow chart illustrating a method performed by a user equipment (UE) in a wireless communication system is shown.

[0637] like Fig.37 As shown, in operation 3710, the UE may receive configuration information associated with a subcarrier spacing (SCS) of a physical random access channel (PRACH) preamble, a root sequence index of the PRACH preamble, and zero correlation zone (ZCZ) configuration information from a base station. In one example, the PRACH subcarrier spacing of a single long wideband PRACH sequence may be derived from the msg1-SubcarrierSpacing field from the RRC information element (IE) RACH-ConfigCommon; or if the field does not exist, the UE may apply an SCS derived from a PRACH configuration table, such as when the number of PRACH slots within a subframe is configured as 2 in the PRACH configuration table, the PRACH SCS is 30 kHz.

[0638] In operation 3730, the UE may determine a sequence length of the PRACH preamble based on configuration information associated with the SCS of the PRACH preamble. In one example, the length of a single long wideband PRACH sequence may be implicitly configured by the PRACH subcarrier spacing, and potentially without using an additional field indicating a legacy NR standard specification PRACH. In one embodiment, the sequence length may correspond to the length of a single long wideband PRACH sequence.

[0639] In operation 3750, the UE may determine a sequence number of the PRACH preamble based on the root sequence index. In one embodiment, the sequence number may correspond to a prach-RootSequenceIndex indicating a logical root sequence index of the PRACH sequence.

[0640] In one example, when the configuration length is L RA When a single long broadband prach sequence is used, the prach-RootSequenceIndex indicating the logical root sequence index of the PRACH sequence in the RRC-ConfigCommonIE also needs to be used from 0 to L RA –2. In one example, when L RA When 1151, the logical index 2*i (0<=i<=574) is mapped to the physical root sequence index i+1; and the logical index 2*i+1 is mapped to the physical root sequence index 1151-i-1 (0<=i<=574).

[0641] In operation 3770, the UE may determine the cyclic shift of the PRACH preamble based on the ZCZ configuration information. In one embodiment, the UE may determine N based on the ZCZ configuration information and the sequence length. CS value, and based on N CS The value is used to determine the cyclic shift of the PRACH preamble code.

[0642] In one embodiment, the supported N bits that can be used when generating the cyclic shift value are CS Values ​​and indices from zeroCorrelationZoneConfg to N CS The corresponding mapping of can be enhanced from the NR standard specification to support a single long wideband PRACH sequence. In one example, if N CS The number of desired cyclic shifts C generated by the value v is n (n≠0), then N CS The value of N is determined cs =floor(L RA / n).

[0643] In operation 3790, the UE may transmit a PRACH preamble based on the sequence number, cyclic shift, and sequence length to the base station.

[0644] Fig.38 A flow chart illustrating a method performed by a base station (BS) in a wireless communication system is shown.

[0645] like Fig.38As shown, in operation 3810, the BS may send configuration information associated with the subcarrier spacing (SCS) of the physical random access channel (PRACH) preamble, the root sequence index of the PRACH preamble, and the zero correlation zone (ZCZ) configuration information to the terminal. In one example, the PRACH subcarrier spacing of a single long wideband PRACH sequence may be derived from the msg1-SubcarrierSpacing field from the RRC information element (IE) RACH-ConfigCommon; or if the field does not exist, the UE may apply the SCS derived from the PRACH configuration table, such as when the number of PRACH slots within a subframe is configured as 2 in the PRACH configuration table, the PRACH SCS is 30kHz. In one example, the length of a single long wideband PRACH sequence may be implicitly configured by the PRACH subcarrier spacing, and potentially no additional field indicating the legacy NR standard specification PRACH is used. In one embodiment, the sequence length may correspond to the length of a single long wideband PRACH sequence.

[0646] In operation 3830, the BS may receive a PRACH preamble based on a sequence number of the PRACH preamble, a cyclic shift of the PRACH preamble, and a sequence length of the PRACH preamble from the terminal. In one embodiment, the sequence length of the PRACH preamble may be determined based on configuration information associated with the SCS of the PRACH preamble. The sequence number of the PRACH preamble may be determined based on a root sequence index. The cyclic shift of the PRACH preamble may be determined based on the ZCZ configuration information. In one embodiment, the sequence number may correspond to the prach-RootSequenceIndex indicating the logical root sequence index of the PRACH sequence. In one embodiment, when the root sequence index is an even number, the sequence number is determined to be (root sequence index / 2+1), and when the root sequence index is an odd number, the sequence number is determined to be (sequence length-i-1), where i=(root sequence index-1) / 2, and 0≤i≤(sequence length-1) / 2-1.

[0647] In one embodiment, based on N CS The cyclic shift of the PRACH preamble is determined by the value, and N is determined based on the ZCZ configuration information and the sequence length. CS value.

[0648] Although the present disclosure has been described with exemplary embodiments, various changes and modifications may occur to those skilled in the art. The present disclosure is intended to include these changes and modifications that fall within the scope of the appended claims. The description in this application should not be construed as implying that any particular element, step or function is an essential element that must be included within the scope of the claims. The scope of the patent subject matter is limited only by the claims.

Claims

1. A method performed by a terminal in a wireless communication system, the method include: Receiving random access channel RACH configuration information from a base station, the RACH configuration information including information associated with a root sequence index and zero correlation zone ZCZ configuration information; The subcarrier spacing SCS of the physical random access channel PRACH is identified as 15kHz or 30kHz; L RA Identified as 1151 or 571, wherein, when the SCS of the PRACH is 15kHz, L RA is 1151, and when the SCS of the PRACH is 30kHz, L RA is 571; Based on the ZCZ configuration information and L RA To identify the cyclic shift; Identifying a sequence number based on the root sequence index; Based on the sequence number, the cyclic shift and L RA generating a PRACH preamble; and sending the PRACH preamble code to the base station, Among them, L RA is a value associated with the PRACH, Wherein, when the root sequence index is an even number, the sequence number is equal to (root sequence index / 2+1); and Wherein, when the root sequence index is an odd number, the sequence number is equal to (L RA -(root sequence index + 1) / 2).

2. The method according to claim 1, in, Identifying the cyclic shift includes: Based on the ZCZ configuration information and L RA To identify N CS value; and Based on the N CS A value is used to identify the cyclic shift.

3. The method according to claim 2, in, When L RA When it is 1151: When the index of the ZCZ configuration information is 0, the N CS The value is recognized as 0; When the index of the ZCZ configuration information is 1, the N CS The value is recognized as 17; When the index of the ZCZ configuration information is 3, the N CS The value is recognized as 25; When the index of the ZCZ configuration information is 4, the N CS The value is recognized as 30; When the index of the ZCZ configuration information is 5, the N CS The value is recognized as 35; When the index of the ZCZ configuration information is 6, the N CS The value is recognized as 44; When the index of the ZCZ configuration information is 7, the N CS The value is recognized as 52; When the index of the ZCZ configuration information is 8, the N CS The value is recognized as 63; When the index of the ZCZ configuration information is 9, the N CS The value is recognized as 82; When the index of the ZCZ configuration information is 10, the N CS The value is recognized as 104; When the index of the ZCZ configuration information is 11, the N CS The value is recognized as 127; When the index of the ZCZ configuration information is 12, the N CS The value is recognized as 164; When the index of the ZCZ configuration information is 13, the N CS The value is recognized as 230; When the index of the ZCZ configuration information is 14, the N CS The value is recognized as 383; as well as When the index of the ZCZ configuration information is 15, the N CS The value is recognized as 575.

4. The method according to claim 2, in, When L RA When it is 571: When the index of the ZCZ configuration information is 0, the N CS The value is recognized as 0; When the index of the ZCZ configuration information is 1, the N CS The value is recognized as 8; When the index of the ZCZ configuration information is 2, the N CS The value is recognized as 10; When the index of the ZCZ configuration information is 3, the N CS The value is recognized as 12; When the index of the ZCZ configuration information is 4, the N CS The value is recognized as 15; When the index of the ZCZ configuration information is 5, the N CS The value is recognized as 17; When the index of the ZCZ configuration information is 6, the N CS The value is recognized as 21; When the index of the ZCZ configuration information is 7, the N CS The value is recognized as 25; When the index of the ZCZ configuration information is 8, the N CS The value is recognized as 31; When the index of the ZCZ configuration information is 9, the N CS The value is recognized as 40; When the index of the ZCZ configuration information is 10, the N CS The value is recognized as 51; When the index of the ZCZ configuration information is 11, the N CS The value is recognized as 63; When the index of the ZCZ configuration information is 12, the N CS The value is recognized as 81; When the index of the ZCZ configuration information is 13, the N CS The value is recognized as 114; When the index of the ZCZ configuration information is 14, the N CS The value is recognized as 190; as well as When the index of the ZCZ configuration information is 15, the N CS The value is recognized as 285.

5. The method according to claim 1, further comprising: include: identifying a number of resource blocks for a physical uplink shared channel (PUSCH) for initial access based on configuration information associated with an SCS of the PUSCH; Based on L RA , the SCS of the PRACH, configuration information associated with the SCS of the PUSCH for initial access, or at least one of the number of resource blocks used for the PUSCH, identifying a value of a baseband signal used to generate the PRACH preamble; as well as A baseband signal of the PRACH preamble is generated based on the identified value.

6. The method according to claim 5, in, Identifying the number of resource blocks used for the PUSCH includes: When the SCS of the PUSCH for initial access is 15 kHz and L RA When the number of resource blocks used for the PUSCH is 571 or 1151, the number of resource blocks used for the PUSCH is identified as being equal to 96; When the SCS of the PUSCH for initial access is 30 kHz and L RA When the value is 571 or 1151, the number of resource blocks used for the PUSCH is identified as being equal to 48; and When the SCS of the PUSCH for initial access is 60 kHz and L RA When it is 571 or 1151, the number of resource blocks used for the PUSCH is identified as equal to 24.

7. The method according to claim 5, in, Identifying a value of a baseband signal used to generate the PRACH preamble code includes: In L RA When the value of the baseband signal used to generate the PRACH preamble code is 571, the value of the baseband signal used to generate the PRACH preamble code is identified as being equal to 2; and In L RA When it is 1151, the value of the baseband signal used to generate the PRACH preamble code is identified as being equal to 1.

8. The method according to claim 1, further comprising: include: In a case where there is no information associated with the value of the SCS in the RACH configuration information, the SCS is derived based on a predetermined PRACH configuration table.

9. The method according to claim 1, in, The information associated with the root sequence index indicates a first value ranging from 0 to 837 or 137 for a licensed band, or a second value ranging from 0 to 569 or 1149 for an unlicensed band.

10. A method performed by a base station BS in a wireless communication system, the method include: Sending random access channel RACH configuration information to the terminal, where the RACH configuration information includes information associated with a root sequence index and zero correlation zone ZCZ configuration information; as well as receiving a physical random access channel PRACH preamble from the terminal, The PRACH preamble is based on the sequence number, cyclic shift and L RA Generated, Among them, the subcarrier spacing SCS of PRACH is identified as 15kHz or 30kHz, Among them, L RA Identified as 1151 or 571, Among them, when the SCS of the PRACH is 15kHz, L RA is 1151, and when the SCS of the PRACH is 30kHz, L RA is 571, Among them, L RA is a value associated with the PRACH, wherein the sequence number is identified based on the root sequence index, The cyclic shift is based on the ZCZ configuration information and L RA be identified, Wherein, when the root sequence index is an even number, the sequence number is equal to (root sequence index / 2+1), and Wherein, when the root sequence index is an odd number, the sequence number is equal to (L RA -(root sequence index + 1) / 2).

11. The method according to claim 10, in, Cyclic shift based on N CS The value is identified; as well as Among them, the N CS Value based on the ZCZ configuration information and L RA be identified.

12. The method according to claim 11, in, When L RA When it is 1151: When the index of the ZCZ configuration information is 0, the N CS The value is recognized as 0; When the index of the ZCZ configuration information is 1, the N CS The value is recognized as 17; When the index of the ZCZ configuration information is 3, the N CS The value is recognized as 25; When the index of the ZCZ configuration information is 4, the N CS The value is recognized as 30; When the index of the ZCZ configuration information is 5, the N CS The value is recognized as 35; When the index of the ZCZ configuration information is 6, the N CS The value is recognized as 44; When the index of the ZCZ configuration information is 7, the N CS The value is recognized as 52; When the index of the ZCZ configuration information is 8, the N CS The value is recognized as 63; When the index of the ZCZ configuration information is 9, the N CS The value is recognized as 82; When the index of the ZCZ configuration information is 10, the N CS The value is recognized as 104; When the index of the ZCZ configuration information is 11, the N CS The value is recognized as 127; When the index of the ZCZ configuration information is 12, the N CS The value is recognized as 164; When the index of the ZCZ configuration information is 13, the N CS The value is recognized as 230; When the index of the ZCZ configuration information is 14, the N CS The value is recognized as 383; as well as When the index of the ZCZ configuration information is 15, the N CS The value is recognized as 575.

13. The method according to claim 11, in, When L RA When it is 571: When the index of the ZCZ configuration information is 0, the N CS The value is recognized as 0; When the index of the ZCZ configuration information is 1, the N CS The value is recognized as 8; When the index of the ZCZ configuration information is 2, the N CS The value is recognized as 10; When the index of the ZCZ configuration information is 3, the N CS The value is recognized as 12; When the index of the ZCZ configuration information is 4, the N CS The value is recognized as 15; When the index of the ZCZ configuration information is 5, the N CS The value is recognized as 17; When the index of the ZCZ configuration information is 6, the N CS The value is recognized as 21; When the index of the ZCZ configuration information is 7, the N CS The value is recognized as 25; When the index of the ZCZ configuration information is 8, the N CS The value is recognized as 31; When the index of the ZCZ configuration information is 9, the N CS The value is recognized as 40; When the index of the ZCZ configuration information is 10, the N CS The value is recognized as 51; When the index of the ZCZ configuration information is 11, the N CS The value is recognized as 63; When the index of the ZCZ configuration information is 12, the N CS The value is recognized as 81; When the index of the ZCZ configuration information is 13, the N CS The value is recognized as 114; When the index of the ZCZ configuration information is 14, the N CS The value is recognized as 190; as well as When the index of the ZCZ configuration information is 15, the N CS The value is recognized as 285.

14. The method according to claim 11, in, The information associated with the root sequence index indicates a first value ranging from 0 to 837 or 137 for a licensed band, or a second value ranging from 0 to 569 or 1149 for an unlicensed band.

15. A terminal in a wireless communication system, the terminal include: Transceiver; and at least one processor coupled to the transceiver and configured to: receiving random access channel RACH configuration information from a base station, the RACH configuration information including information associated with a root sequence index and zero correlation zone ZCZ configuration information, The subcarrier spacing SCS of the physical random access channel PRACH is identified as 15kHz or 30kHz. L RA Identified as 1151 or 571, wherein, when the SCS of the PRACH is 15kHz, L RA is 1151, and when the SCS of the PRACH is 30kHz, L RA is 571, Based on the ZCZ configuration information and L RA To identify the cyclic shift, Identifying a sequence number based on the root sequence index, Based on the sequence number, the cyclic shift and L RA Generate the PRACH preamble, and sending the PRACH preamble code to the base station, Among them, L RA is a value associated with the PRACH, Wherein, when the root sequence index is an even number, the sequence number is equal to (root sequence index / 2+1); and Wherein, when the root sequence index is an odd number, the sequence number is equal to (L RA -(root sequence index + 1) / 2).

16. A base station BS in a wireless communication system, the BS include: Transceiver; and at least one processor coupled to the transceiver and configured to: Sending random access channel RACH configuration information to the terminal, the RACH configuration information including information associated with the root sequence index and zero correlation zone ZCZ configuration information, and receiving a physical random access channel PRACH preamble from the terminal, The PRACH preamble is based on the sequence number, cyclic shift and L RA Generated, Among them, the subcarrier spacing SCS of PRACH is identified as 15kHz or 30kHz, Among them, L RA Identified as 1151 or 571; Among them, when the SCS of the PRACH is 15kHz, L RA is 1151, and when the SCS of the PRACH is 30kHz, L RA is 571, Among them, L RA is a value associated with the PRACH, wherein the sequence number is identified based on the root sequence index, The cyclic shift is based on the ZCZ configuration information and L RA be identified, Wherein, when the root sequence index is an even number, the sequence number is equal to (root sequence index / 2+1), and Wherein, when the root sequence index is an odd number, the sequence number is equal to (L RA -(root sequence index + 1) / 2).

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