Method, device and apparatus for wireless communication

Abstract

Certain aspects of the present disclosure provide techniques for validation rules for message transmission timing. In some cases, a user equipment (UE) may select a random access message transmission timing for a preamble and a payload of a random access message, wherein the random access message transmission timing includes a preamble timing and a payload timing, select a preamble sequence for the preamble to be transmitted at the preamble timing of the random access message transmission timing of a two-step random access channel (RACH) procedure, select at least one resource unit (RU) for transmitting the payload at the payload timing, validate the selected random access message transmission timing based on one or more criteria, and if the selected random access message transmission timing is validated, transmit the preamble sequence and the payload at the selected message transmission timing.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to U.S. Application No. 16 / 933,921, filed on July 20, 2020, which claims the benefit of and priority to U.S. Provisional Application No. 62 / 885,075, filed on August 9, 2019, both of which are hereby assigned to the assignee of the present application and are hereby expressly incorporated by reference in their entireties as if fully set forth below and for all applicable purposes. Background Art

[0003] FIELD OF THE DISCLOSURE

[0004] Aspects of the present disclosure relate to wireless communications and, more particularly, to techniques for verification of random access message transmission opportunities.

[0005] Description of Related Technology

[0006] Wireless communication systems are widely deployed to provide various telecommunication services, such as telephone, video, data, messaging, broadcast, etc. These wireless communication systems may employ multiple access technologies that can support communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.). Examples of such multiple access systems include the 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) system, the LTE Advanced (LTE-A) system, the Code Division Multiple Access (CDMA) system, the Time Division Multiple Access (TDMA) system, the Frequency Division Multiple Access (FDMA) system, the Orthogonal Frequency Division Multiple Access (OFDMA) system, the Single-Carrier Frequency Division Multiple Access (SC-FDMA) system, and the Time Division Synchronous Code Division Multiple Access (TD-SCDMA) system, etc.

[0007] These multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different wireless devices to communicate at a local, national, regional, and even global level. An example of an emerging telecommunication standard for a new air interface (e.g., 5G NR). NR is a series of enhancements to the LTE mobile standard promulgated by 3GPP. NR aims to better support mobile broadband Internet access by improving spectral efficiency, reducing costs, improving services, utilizing new spectrum, and using OFDMA with cyclic prefixes on the downlink (DL) and uplink (UL) to better integrate with other open standards. To this end, NR supports beamforming, multiple-input multiple-output (MIMO) antenna technology, and carrier aggregation.

[0008] However, as the demand for mobile broadband access continues to increase, further improvements to NR and LTE technologies are needed. Preferably, these improvements should be applicable to other multi-access technologies and the telecommunication standards that adopt these technologies. Summary of the invention

[0009] The systems, methods, and devices of the present disclosure each have several aspects, no single aspect of which is solely responsible for its desired attributes. Without limiting the scope of the present disclosure as represented by the appended claims, some features will now be briefly discussed. After considering this discussion, and particularly after reading the section entitled "Detailed Description of the Invention," one will understand how the features of the present disclosure provide advantages, such as improved reliability of message decoding and reduced complexity of blind decoding.

[0010] Certain aspects provide a method for wireless communication. The method generally includes: selecting a random access message transmission opportunity for a preamble and a payload of a random access message, wherein the random access message transmission opportunity includes a preamble opportunity and a payload opportunity; selecting a preamble sequence for the preamble to be transmitted at the preamble opportunity of the random access message transmission opportunity of a two-step random access channel (RACH) process; selecting at least one resource unit (RU) for transmitting the payload at the payload opportunity; verifying the selected random access message transmission opportunity based on one or more criteria; and if the selected random access message transmission opportunity is verified, transmitting the preamble sequence and the payload at the selected message transmission opportunity.

[0011] Aspects of the present disclosure provide means for performing the methods described herein, means, processors, and computer-readable media.

[0012] To achieve the aforementioned and related purposes, one or more aspects include the features fully described below and particularly pointed out in the claims. The following description and the accompanying drawings set forth in detail certain illustrative features of one or more aspects. However, these features are only indicative of some of the various ways in which the principles of the various aspects can be employed. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to be able to understand the above-mentioned features of the present disclosure in detail, a more specific description (briefly summarized above) may be made with reference to some aspects, some of which are illustrated in the accompanying drawings. However, it is to be noted that the accompanying drawings illustrate only certain typical aspects of the present disclosure and are therefore not to be considered limiting of its scope, as the description may admit of other equally effective aspects.

[0014] Figure 1 is a block diagram conceptually illustrating an example telecommunications system in accordance with certain aspects of the present disclosure.

[0015] Figure 2 is a block diagram illustrating an example architecture of a distributed radio access network (RAN) in accordance with certain aspects of the present disclosure.

[0016] Figure 3 is a block diagram illustrating an example for implementing a communication protocol stack in an example RAN architecture in accordance with certain aspects of the present disclosure.

[0017] Figure 4 is a block diagram conceptually illustrating designs of example base stations (BS) and user equipment (UE) according to certain aspects of the present disclosure.

[0018] Figure 5 An example system architecture for interworking between a 5G system (5GS) and an evolved universal mobile telecommunication system network (E-UTRAN) system in accordance with certain aspects of the present disclosure is illustrated.

[0019] Figure 6 An example of a frame format for a telecommunications system in accordance with certain aspects of the present disclosure is shown.

[0020] Figure 7 is a timing diagram illustrating an example four-step RACH procedure in accordance with certain aspects of the present disclosure.

[0021] Figure 8 is a timing diagram illustrating an example two-step RACH procedure in accordance with certain aspects of the present disclosure.

[0022] Fig. 9A The channel structure of msgA is shown in accordance with certain aspects of the present disclosure.

[0023] Fig. 9B Transmission timing of msgA according to certain aspects of the present disclosure is shown.

[0024] Fig.10 is a flow diagram illustrating example operations for wireless communications by a UE in accordance with certain aspects of the present disclosure.

[0025] Fig.11A and Fig. 11B is a graphical representation of conditions or criteria for valid message transmission opportunities in accordance with certain aspects of the present disclosure.

[0026] Fig.12 is a call flow diagram illustrating example signaling between a UE and a BS according to aspects of the present disclosure.

[0027] Fig.13 A communications device according to aspects of the present disclosure is shown, which may include various components configured to perform operations of the techniques disclosed herein.

[0028] To facilitate understanding, identical reference numerals have been used, where possible, to designate identical elements in the drawings. It is contemplated that elements disclosed in one aspect may be beneficially utilized on other aspects without specific recitation. DETAILED DESCRIPTION

[0029] Aspects of the present disclosure provide apparatus, methods, processing systems, and computer-readable media for validating random access message transmission opportunities by applying one or more validation rules regarding time and frequency resources for transmitting a random access channel (RACH) preamble sequence and a payload in the random access message transmission opportunity.

[0030] The following description provides examples and does not limit the scope, applicability or examples set forth in the claims. Without departing from the scope of the present disclosure, the functions and arrangements of the elements discussed may be changed. Various examples may appropriately omit, replace or add various processes or components. For example, the described method may be performed in a different order than described, and various steps may be added, omitted or combined. In addition, the features described with respect to some examples may be combined in some other examples. For example, any number of aspects set forth herein may be used to implement a device or practice method. In addition, the scope of the present disclosure is intended to cover such a device or method, which is practiced using other structures, functions or structures and functions in addition to or different from the various aspects of the present disclosure set forth herein. It should be understood that any aspect of the disclosure disclosed herein may be embodied by one or more elements of the claims. The word "exemplary" is used herein to mean "used as an example, instance or illustration". Any aspect described herein as an "example" is not necessarily to be interpreted as being superior or superior to other aspects.

[0031] The technology described herein can be used for various wireless communication technologies, such as LTE, CDMA, TDMA, FDMA, OFDMA, SC-FDMA and other networks. The terms "network" and "system" are often used interchangeably. A CDMA network can implement radio technologies such as Universal Terrestrial Radio Access (UTRA), cdma2000, etc. UTRA includes other variants of Wideband CDMA (WCDMA) and CDMA. Cdma2000 covers IS-2000, IS-95 and IS-856 standards. A TDMA network can implement radio technologies such as Global System for Mobile Communications (GSM). An OFDMA network can implement radio technologies such as NR (e.g., 5G RA), Evolved UTRA (E-UTRA), Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash OFDMA, etc. UTRA and E-UTRA are part of the Universal Mobile Telecommunication System (UMTS).

[0032] New air interface (NR) is an emerging wireless communication technology developed together with the 5G Technology Forum (5GTF). 3GPP Long Term Evolution (LTE) and LTE-Advanced (LTE-A) are versions of UMTS using E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A and GSM are described in documents from an organization named "3rd Generation Partnership Project" (3GPP). Cdma2000 and UMB are described in documents from an organization named "3rd Generation Partnership Project 2" (3GPP 2). The technology described herein can be used for the above-mentioned wireless networks and radio technologies as well as other wireless networks and radio technologies. For the sake of clarity, although various aspects may be described herein using terms commonly associated with 3G and / or 4G wireless technologies, various aspects of the present disclosure may be applied to other communication systems based on generations, such as 5G and higher versions, including NR technology.

[0033] New radio (NR) access (e.g., 5G technology) can support various wireless communication services, such as enhanced mobile broadband (eMBB) targeting wide bandwidth (e.g., 80 MHz or higher), millimeter wave (mmW) targeting high carrier frequency (e.g., 25 GHz or higher), massive machine type communication MTC (mMTC) targeting non-backward compatible MTC technology, and / or mission critical targeting ultra-reliable low latency communication (URLLC). These services may include latency and reliability requirements. These services may also have different transmission time intervals (TTIs) to meet their respective quality of service (QoS) requirements. In addition, these services can coexist in the same subframe.

[0034] Example Wireless Communication System

[0035] Figure 1 An example wireless communication network 100 is shown in which various aspects of the present disclosure may be performed. For example, according to various aspects discussed herein, a UE 120 may be configured to perform Fig.10 Operation 1000 of verifying a random access message transmission opportunity in a two-step RACH procedure.

[0036] like Figure 1As shown, the wireless communication network 100 may include multiple base stations (BS) 110 and other network entities. A BS may be a station that communicates with a user equipment (UE). Each BS 110 may provide communication coverage for a specific geographic area. In 3GPP, the term "cell" may refer to the coverage area of ​​a Node B (NB) and / or a NB subsystem serving the coverage area, depending on the context in which the term is used. In the NR system, the term "cell" and the next generation NodeB (gNB or gNodeB), NRBS, 5G NB, access point (AP) or transmission reception point (TRP) may be interchangeable. In some examples, the cell is not necessarily stationary, and the geographic area of ​​the cell may move according to the location of the mobile BS. In some examples, the base stations may be interconnected to each other and / or to one or more other base stations or network nodes (not shown) in the wireless communication network 100 via various types of backhaul interfaces (such as direct physical connections, wireless connections, virtual networks, etc. using any suitable transport network).

[0037] Typically, any number of wireless networks can be deployed in a given geographic area. Each wireless network can support a specific radio access technology (RAT) and can operate on one or more frequencies. RAT may also be referred to as radio technology, air interface, etc. Frequency may also be referred to as carrier, subcarrier, channel, tone, subband, etc. Each frequency can support a single RAT in a given geographic area to avoid interference between wireless networks of different RATs. In some cases, NR or 5G RAT networks may be deployed.

[0038] A BS may provide communication coverage for macro cells, pico cells, femto cells, and / or other types of cells. A macro cell may cover a relatively large geographic area (e.g., a radius of several kilometers) and may allow unrestricted access to UEs with service subscriptions. A pico cell may cover a relatively small geographic area and may allow unrestricted access to UEs with service subscriptions. A femto cell may cover a relatively small geographic area (e.g., a home) and may allow restricted access to UEs associated with the femto cell (e.g., UEs in a Closed Subscriber Group (CSG)), UEs of users in a home, etc.). The BS of a macro cell may be referred to as a macro BS. The BS of a pico cell may be referred to as a pico BS. The BS of a femto cell may be referred to as a femto BS or a home BS. In Figure 1In the example shown, BSs 110a, 110b, and 110c may be macro BSs for macro cells 102a, 102b, and 102c, respectively. BS 110x may be a pico BS for pico cell 102x. BSs 110y and 110z may be femto BSs for femto cells 102y and 102z, respectively. A BS may support one or more (eg, three) cells.

[0039] The wireless communication network 100 may also include a relay station. A relay station is a station that receives transmissions of data and / or other information from an upstream station (e.g., a BS or a UE) and sends transmissions of data and / or other information to a downstream station (e.g., a UE or a BS). A relay station may also be a UE that relays transmissions for other UEs. Figure 1 In the example shown, a relay station 110r may communicate with a BS 110a and a UE 120r to facilitate communication between the BS 110a and the UE 120r. A relay station may also be referred to as a relay BS, a relay station, or the like.

[0040] The wireless communication network 100 may be a heterogeneous network including different types of BSs, such as a macro BS, a pico BS, a femto BS, a relay station, etc. These different types of BSs may have different transmit power levels, different coverage areas, and different effects on interference in the wireless communication network 100. For example, a macro BS may have a high transmit power level (e.g., 20 watts), while a pico BS, a femto BS, and a relay station may have a lower transmit power level (e.g., 1 watt).

[0041] The wireless communication network 100 may support synchronous or asynchronous operation. For synchronous operation, the BSs may have similar frame timing, and transmissions from different BSs may be roughly aligned in time. For asynchronous operation, the BSs may have different frame timing, and transmissions from different BSs may not be consistent in time. The techniques described herein may be used for both synchronous and asynchronous operation.

[0042] A network controller 130 may couple to a set of BSs and provide coordination and control for these BSs. The network controller 130 may communicate with the BSs 110 via a backhaul. The BSs 110 may also communicate with each other (eg, directly or indirectly) via a wireless or wired backhaul.

[0043] UE 120 (e.g., 120x, 120y, etc.) may be dispersed throughout the wireless communication network 100, and each UE may be fixed or mobile. UE may also be referred to as a mobile station, terminal, access terminal, subscriber unit, station, Customer Premises Equipment (CPE), cellular phone, smart phone, personal digital assistant (PDA), wireless modem, wireless communication device, handheld device, laptop computer, cordless phone, wireless local loop (WLL) station, tablet computer, camera, gaming device, netbook, smartbook, ultrabook, appliance, medical device or medical equipment, biosensor / device, wearable device such as smart watch, smart clothing, smart glasses, smart wristband, smart jewelry (e.g., smart ring, smart bracelet, etc.), entertainment device (e.g., music device, video device, satellite radio, etc.), vehicle component or sensor, smart meter / sensor, industrial manufacturing equipment, global positioning system device, or any other suitable device configured to communicate via wireless or wired medium. Some UEs may be considered as machine-type communication (MTC) devices or evolved MTC (eMTC) devices. MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, etc., which can communicate with a BS, another device (e.g., a remote device), or some other entity. For example, a wireless node can provide a connection to a network (e.g., a wide area network such as the Internet or a cellular network) or provide a connection to a network via a wired or wireless communication link. Some UEs may be considered as Internet-of-Things (IoT) devices, which may be narrowband IoT (NB-IoT) devices.

[0044] Some wireless networks (e.g., LTE) utilize orthogonal frequency division multiplexing (OFDM) on the downlink and single carrier frequency division multiplexing (SC-FDM) on the uplink. OFDM and SC-FDM divide the system bandwidth into multiple (K) orthogonal subcarriers, which are also commonly referred to as single tones, frequency bins, etc. Each subcarrier can be modulated with data. Typically, modulation symbols are sent in the frequency domain using OFDM, and modulation symbols are sent in the time domain using SC-FDM. The spacing between adjacent subcarriers can be fixed, and the total number of subcarriers (K) can depend on the system bandwidth. For example, the spacing of the subcarriers can be 15kHz, and the minimum resource allocation (called a "resource block (RB)") can be 12 subcarriers (or 180kHz). Therefore, for system bandwidths of 1.25, 2.5, 5, 10, or 20 megahertz (MHz), the nominal fast Fourier transform (FFT) size can be equal to 128, 256, 512, 1024, or 2048, respectively. The system bandwidth may also be divided into subbands. For example, one subband may cover 1.08 MHz (ie, 6 resource blocks), and there may be 1, 2, 4, 8, or 16 subbands for system bandwidths of 1.25, 2.5, 5, 10, or 20 MHz, respectively.

[0045] Although aspects of the examples described herein may be associated with LTE technology, aspects of the present disclosure may be applicable to other wireless communication systems, such as NR. NR may utilize OFDM with CP on both the uplink and downlink, and include support for half-duplex operation using TDD. Beamforming may be supported, and the beam direction may be dynamically configured. MIMO transmissions with precoding may also be supported. The MIMO configuration in the downlink may support up to 8 transmit antennas with up to 8 streams and multi-layer downlink transmissions of up to 2 streams per UE. Multi-layer transmissions of up to 2 streams per UE may be supported. Aggregation of multiple cells of up to 8 serving cells may be supported.

[0046] In some examples, access to the air interface can be scheduled. A scheduling entity (e.g., BS) allocates resources for communications between some or all devices and apparatuses within its service area or cell. A scheduling entity may be responsible for scheduling, allocating, reconfiguring, and releasing resources for one or more subordinate entities. That is, for scheduled communications, subordinate entities utilize resources allocated by the scheduling entity. The base station is not the only entity that can act as a scheduling entity. In some examples, a UE may act as a scheduling entity and may schedule resources for one or more subordinate entities (e.g., one or more other UEs), and other UEs may use the resources scheduled by the UE for wireless communications. In some examples, a UE may act as a scheduling entity in a peer-to-peer (P2P) network and / or a mesh network. In a mesh network example, in addition to communicating with a scheduling entity, UEs may also communicate directly with each other.

[0047] exist Figure 1 In FIG. 1 , a solid line with double arrows represents desired transmissions between a UE and a serving BS, which is a BS designated to serve the UE on the downlink and / or uplink. A thin dashed line with double arrows indicates interfering transmissions between the UE and the BS.

[0048] Figure 2 An example architecture of a distributed radio access network (RAN) 200 is shown. The RAN 200 may be configured in Figure 1 The wireless communication network 100 shown in FIG. Figure 2 As shown, the distributed RAN includes a core network (CN) 202 and an access node 208 .

[0049] The CN 202 may host core network functions. The CN 202 may be centrally deployed. The CN 202 functions may be offloaded (e.g., to Advanced Wireless Services (AWS)) in an effort to handle peak capacity. The CN 202 may include an Access and Mobility Management Function (AMF) 204 and a User Plane Function (UPF) 206. The AMF 204 and the UPF 206 may perform one or more of the core network functions.

[0050] AN 208 may communicate with CN 202 (e.g., via a backhaul interface). AN 208 may communicate with AMF 204 via an N2 (e.g., NG-C) interface. AN 208 may communicate with UPF 208 via an N3 (e.g., NG-U) interface. AN 208 may include a central unit-control plane (CU-CP) 210, one or more central unit user planes (CU-UP) 212, one or more distributed units (DU) 214-218, and one or more antenna / remote radio units (AU / RRU) 220-224. CU and DU may also be referred to as gNB-CU and gNB-DU, respectively. One or more components of AN 208 may be implemented in gNB 226. AN 208 may communicate with one or more neighboring gNBs.

[0051] The CU-CP 210 may be connected to one or more of the control units 214-218. The CU-CP 210 and the DUs 214-218 may be connected via an F1-C interface. Figure 2 As shown, CU-CP 210 can be connected to multiple DUs, but these DUs can be connected to only one CU-CP. Figure 2 Only one CU-UP 212 is shown, but the AN 208 may include multiple CU-UPs. The CU-CP 210 selects appropriate CU-UP(s) for the requested service (eg, for a UE).

[0052] (Multiple) CU-UP 212 can be connected to CU-CP 210. For example, (multiple) CU-UP 212 and CU-CP 210 can be connected via E1 interface. (Multiple) CU-CP 212 can be connected to one or more of DU 214-218. (Multiple) CU-UP 212 and DU 214-218 can be connected via F1-U interface. Figure 2 As shown, the CU-CP 210 may be connected to multiple CU-UPs, but a CU-UP may be connected to only one CU-CP.

[0053] DUs such as DU 214, 216 and / or 218 may carry one or more TRPs (transmit / receive points, which may include edge nodes (ENs), edge units (EUs), radio heads (RHs), smart radio heads (SRHs), etc.). The DU may be located at the edge of the network with radio frequency (RF) functionality. The DU may be connected to multiple CU-UPs (e.g., for RAN sharing, radio as a service (RaaS), and service-specific deployments) that are connected to (e.g., under control of) the same CU-CP. The UE may be configured to provide services to the UE individually (e.g., dynamically selected) or jointly (e.g., joint transmission). Each DU 214-216 may be connected to one of the AU / RRUs 220-224.

[0054] The CU-CP 210 may be connected to a plurality of DUs connected to the same CU-UP 212 (e.g., under the control of the same CU-UP 212). The connection between the CU-UP 212 and the DU may be established by the CU-CP 210. For example, a bearer context management function may be used to establish the connection between the CU-UP 212 and the DU. Data forwarding between (multiple) CU-UPs 212 may be performed via an Xn-U interface.

[0055] The distributed RAN 200 can support front-end solutions across different deployment types. For example, the RAN 200 architecture can be based on transport network capabilities (e.g., bandwidth, latency, and / or jitter). The distributed RAN 200 can share features and / or components with LTE. For example, the AN 208 can support dual connectivity with NR and can share a common front end for LTE and NR. The distributed radio access network 200 can enable cooperation between DUs 214-218, for example, via the CU-CP 212. Inter-DU interfaces may not be used.

[0056] Logical functions may be dynamically distributed in the distributed RAN 200. Figure 3 Described in more detail, the radio resource control (RRC) layer, the packet data convergence protocol (PDCP) layer, the radio link control (RLC) layer, the medium access control (MAC) layer, the physical (PHY) layer and / or the radio frequency (RF) layer can be adaptively placed in the AN and / or the UE.

[0057] Figure 3The accompanying drawings illustrate an example of a communication protocol stack 300 for implementing in a RAN (e.g., such as RAN 200) according to aspects of the present disclosure. The illustrated communication protocol stack 300 may be implemented by a device operating in a wireless communication system (e.g., a 5G NR system (e.g., wireless communication network 100)). In various examples, the layers of the protocol stack 300 may be implemented as separate software modules, as part of a processor or ASIC, as part of a non-collocated device connected by a communication link, or various combinations thereof. Collocated and non-collocated implementations may be used, for example, in a protocol stack of a network access device or UE. As shown in FIG. Figure 3 As shown, the system can support various services through one or more protocols. One or more protocol layers of the protocol stack 300 can be implemented by the AN and / or the UE.

[0058] like Figure 3 As shown, the protocol stack 300 is in AN (e.g., Figure 2 The RRC layer 305, the PDCP layer 310, the RLC layer 315, the MAC layer 320, the (multiple) PHY layers 325, and the RF layer 530 may be implemented by the AN. For example, the CU-CP (e.g., Figure 2 CU-CP 210) and CU-UP in, for example, Figure 2 Each of the CU-UP 212 in the DU (e.g., Figure 2 DU 214-218 in the AU / RRU (e.g., Figure 2 The AU / RRUs 220-224 in the RF module 200 may implement PHY layer(s) 325 and RF layer(s) 330. The PHY layer 325 may include a high PHY layer and a low PHY layer.

[0059] The UE may implement the entire protocol stack 300 (eg, the RRC layer 305, the PDCP layer 310, the RLC layer 315, the MAC layer 320, the PHY layer(s) 325, and the RF layer(s) 330).

[0060] Figure 4 1 and 120 (eg, Figure 1 For example, antenna 452, processor 466, 458, 464 and / or controller / processor 480 of UE 120 may be configured to perform reference Fig.10 Describes the operation.

[0061] At BS 110, a transmit processor 420 may receive data from a data source 412 and control information from a controller / processor 440. The control information may be for a physical broadcast channel (PBCH), a physical control format indicator channel (PCFICH), a physical hybrid ARQ indicator channel (PHICH), a physical downlink control channel (PDCCH), a group common PDCCH (GC PDCCH), etc. The data may be for a physical downlink shared channel (PDSCH), etc. The processor 420 may process (e.g., encode and symbol map) the data and the control information to obtain data symbols and control symbols, respectively. The processor 420 may also generate reference symbols for, for example, a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a cell-specific reference signal (CRS). If applicable, the transmit (TX) multiple-input multiple-output (MIMO) processor 430 can perform spatial processing (e.g., precoding) on ​​the data symbols, control symbols, and / or reference symbols, and can provide an output symbol stream to the modulators (MOD) 432a to 432t. Each modulator 432 can process a respective output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator can also process (e.g., convert to analog, amplify, filter, and up-convert) the output sample stream to obtain a downlink signal. The downlink signals from the modulators 432a to 432t can be transmitted via antennas 434a to 434t, respectively.

[0062] At UE 120, antennas 452a to 452r may receive downlink signals from BS 110 and may provide received signals to demodulators (DEMODs) in transceivers 454a to 454r, respectively. Each demodulator 454 may condition (e.g., filter, amplify, downconvert, and digitize) a respective received signal to obtain input samples. Each demodulator may also process the input samples (e.g., for OFDM, etc.) to obtain received symbols. A MIMO detector 456 may obtain received symbols from all demodulators 454a to 454r, perform MIMO detection on the received symbols if applicable, and provide detected symbols. A receive processor 458 may process (e.g., demodulate, deinterleave, and decode) the detected symbols, provide decoded data for UE 120 to a data sink 460, and provide decoded control information to a controller / processor 480.

[0063] On the uplink, at the UE 120, a transmit processor 464 may receive and process data from a data source 462 (e.g., for a physical uplink shared channel (PUSCH)) and control information from a controller / processor 480 (e.g., for a physical uplink control channel (PUCCH)). The transmit processor 464 may also generate reference symbols for reference signals (e.g., a sounding reference signal (SRS)). The symbols from the transmit processor 464 may be precoded by a TX MIMO processor 466, if applicable, further processed by a demodulator in the transceivers 454a through 454r (e.g., for SC-FDM, etc.), and transmitted to the base station 110. At the BS 110, the uplink signals from the UE 120 may be received by the antenna 434, processed by the modulator 432, detected by the MIMO detector 436 (if applicable), and further processed by the receive processor 438 to obtain decoded data and control information transmitted by the UE 120. The receive processor 438 may provide the decoded data to a data sink 439 and the decoded control information to a controller / processor 440 .

[0064] Controllers / processors 440 and 480 may direct the operation of BS 110 and UE 120, respectively. Processor 440 and / or other processors and modules at BS 110 may perform or direct the execution of processes for the techniques described herein. Memories 442 and 482 may store data and program codes for BS 110 and UE 120, respectively. Scheduler 444 may schedule UEs for data transmission on the downlink and / or uplink.

[0065] Figure 5 An example system architecture 500 for interworking between a 5GS (e.g., such as distributed RAN 200) and an E-UTRAN-EPC is shown in accordance with certain aspects of the present disclosure. Figure 5 As shown, UE 502 may be served by independent RAN 504A and 504B controlled by independent core networks 506A and 506B, where RAN 504A provides electronic UTRA services and RAN 504B provides 5G NR services. A UE may operate under only one RAN / CN or two RAN / CNs at a time.

[0066] In LTE, the basic transmission time interval (TTI) or packet duration is a 1ms subframe. In NR, the subframe is still 1ms, but the basic TTI is called a time slot. Depending on the subcarrier spacing, the subframe contains a variable number of time slots (e.g., 1, 2, 4, 8, 16, ... time slots). NR RB is 12 consecutive frequency subcarriers. NR can support a basic subcarrier spacing of 15kHz, and other subcarrier spacings such as 30kHz, 60kHz, 120kHz, 240kHz, etc. can be defined relative to the basic subcarrier spacing. Symbol and time slot lengths vary with the subcarrier spacing. The CP length also depends on the subcarrier spacing.

[0067] Figure 6 is a diagram showing an example of a frame format 600 for NR. The transmission timeline for each of the downlink and uplink may be divided into units of radio frames. Each radio frame may have a predetermined duration (e.g., 10 ms) and may be divided into 10 subframes, each 1 ms, indexed from 0 to 9. Depending on the subcarrier spacing, each subframe may include a variable number of slots. Depending on the subcarrier spacing, each slot may include a variable number of symbol periods (e.g., 7 or 14 symbols). The symbol periods in each slot may be assigned indices. A mini slot, which may be referred to as a subslot structure, refers to a transmission time interval having a duration less than a slot (e.g., 2, 3, or 4 symbols).

[0068] Each symbol in a time slot may indicate the link direction of data transmission (e.g., DL, UL, or flexible), and the link direction of each subframe may be switched dynamically. The link direction may be based on the time slot format. Each time slot may include DL / UL data and DL / UL control information.

[0069] In NR, a synchronization signal (SS) block is transmitted. The SS block includes PSS, SSS, and dual-symbol PBCH. The SS block can be transmitted at a fixed time slot position, such as Figure 6Symbols 0-3 shown. The UE can use PSS and SSS for cell search and acquisition. PSS can provide half-frame timing, and SS can provide CP length and frame timing. PSS and SSS can provide cell identity. PBCH carries some basic system information, such as downlink system bandwidth, timing information within a radio frame, SS burst set periodicity, system frame number, etc. SS blocks can be organized into SS bursts to support beam scanning. In certain subframes, other system information, such as remaining minimum system information (RMSI), system information block (SIB), and other system information (OSI) can be transmitted on the physical downlink shared channel (PDSCH). For example, an SS block can be transmitted up to 64 times, with up to 64 different beam directions for millimeter waves. Up to 64 transmissions of SS blocks are called SS burst sets. SS blocks in an SS burst set are transmitted in the same frequency region, while SS blocks in different SS burst sets can be transmitted at different frequency locations.

[0070] In some cases, two or more slave entities (e.g., UEs) may communicate with each other using sidelink signals. Real-world applications of such sidelink communications may include public safety, proximity services, UE-to-network relay, vehicle-to-vehicle (V2V) communications, Internet of Everything (IoE) communications, IoT communications, mission-critical grids, and / or various other suitable applications. In general, a sidelink signal may refer to a communication transmitted from one slave entity (e.g., UE 1) to another slave entity (e.g., UE2) without relaying the communication through a scheduling entity (e.g., UE or BS), even though the scheduling entity may be used for scheduling and / or control purposes. In some examples, a licensed spectrum may be used to transmit sidelink signals (unlike wireless local area networks that typically use unlicensed spectrum).

[0071] The UE may operate in various radio resource configurations, including a configuration associated with sending a pilot using a dedicated resource set (e.g., a radio resource control (RRC) dedicated state, etc.) or a configuration associated with sending a pilot using a common resource set (e.g., an RRC common state, etc.). When operating in the RRC dedicated state, the UE may select a dedicated resource set to send a pilot signal to the network. When operating in the RRC common state, the UE may select a common resource set to send a pilot signal to the network. In either case, the pilot signal sent by the UE may be received by one or more network access devices (such as an AN or DU or a portion thereof). Each receiving network access device may be configured to receive and measure a pilot signal sent on a common resource set, and also receive and measure a pilot signal sent on a dedicated resource set allocated to a UE for which the network access device is a member of a network access device monitoring set of the UE. One or more of the CUs receiving the measurement to which the network access device (or multiple) receives the pilot signal may use the measurement to identify the serving cell of the UE, or initiate a change in the serving cell of one or more UEs.

[0072] Example RACH Procedure

[0073] The Random Access Channel (RACH) is so named because it refers to a radio channel (medium) that can be shared by multiple User Equipments (UEs) and used by UEs to (randomly) access the network for communication. For example, RACH can be used for call establishment and access to the network for data transmission. In some cases, RACH can be used for initial access to the network when the UE switches from RRC connected idle mode to active mode, or when switching to RRC connected mode. In addition, RACH can be used for downlink (DL) and / or uplink (UL) data arrival when the UE is in RRC idle or RRC inactive mode, and when reestablishing a connection with the network.

[0074] Figure 7700 is a timing (or "call flow") diagram illustrating an example four-step RACH process according to certain aspects of the present disclosure. A first message (MSG1) may be sent from UE 120 to BS 110 on a physical random access channel (PRACH). In this case, MSG1 may include only a RACH preamble. BS 110 may respond with a random access response (RAR) message (MSG2), which may include an identifier (ID) of the RACH preamble, a timing advance (TA), an uplink grant, a cell radio network temporary identifier (C-RNTI), and a backoff indicator. As shown, MSG2 may include a physical downlink control channel (PDCCH) communication that includes control information for subsequent communications on a physical downlink shared channel (PDSCH). In response to MSG2, a third message (MSG3) is sent from UE 120 to BS 110 on a physical uplink shared channel (PUSCH). MSG3 may include one or more of an RRC connection request, a tracking area update request, a system information request, a positioning fix or positioning signal request, or a scheduling request.BS 110 then responds with a fourth message (MSG4), which may include a contention resolution message.

[0075] In some cases, in order to speed up access, a two-step RACH procedure may be supported. As the name implies, the two-step RACH procedure can effectively "fold" the four messages of the four-step RACH procedure into two messages.

[0076] Figure 8 8 is a timing diagram 800 illustrating an example two-step RACH process according to certain aspects of the present disclosure. A first enhancement message (msgA) may be sent from UE 120 to BS 110. In certain aspects, msgA includes some or all of the information of MSG1 and MSG3 from the four-step RACH process, effectively combining MSG1 and MSG3. For example, msgA may include MSG1 and MSG3 multiplexed together, for example, using one of time division multiplexing or frequency division multiplexing. In certain aspects, msgA includes a RACH preamble and a payload for random access. For example, the msgA payload may include a UE ID and other signaling information (e.g., a buffer status report (BSR)) or a scheduling request (SR). BS 110 may respond with a RAR message (msgB), which may effectively combine the above-mentioned MSG2 and MSG4. For example, msgB may include an ID of a RACH preamble, a timing advance (TA), a backoff indicator, a contention resolution message, an UL / DL grant, and a transmit power control (TPC) command.

[0077] Example random access message transmission timing validation rules

[0078] As described above, in the two-step RACH procedure, msgA may include a RACH preamble and a payload. Fig. 9A A channel structure of an example msgA transmission opportunity that may be verified according to certain aspects of the present disclosure is shown.

[0079] As shown in the figure, the msgA transmission opportunity generally includes the msgA preamble opportunity (used to transmit the preamble signal) and the msgA payload opportunity (used to transmit the PUSCH). Fig. 9A As shown, msgA preamble transmission usually involves:

[0080] (1) Selection of preamble sequence; and

[0081] (2) Selection of preamble opportunities in the time / frequency domain (for transmission of the selected preamble sequence).

[0082] A msgA payload transmission typically involves:

[0083] (1) Construction of random access message payload (demodulation reference signal (DMRS) and / or PUSCH); and

[0084] (2) Select one or more PUSCH resource units (PRUs) in the time / frequency domain to transmit the message (payload).

[0085] like Fig. 9B As shown, the UE monitors synchronization signal block (SSB) transmissions sent (by the gNB using different beams) and associated with a limited set of time / frequency resources defining RACH opportunities (ROs) and PRUs. As will be described in more detail below, upon detecting an SSB, the UE may select the RO and one or more PRUs associated with the SSB for msgA transmission. The limited set of ROs and PRUs may help reduce the monitoring overhead (blind decoding) of the base station.

[0086] The two-step RACH procedure has several benefits, such as access speed and the ability to send relatively small amounts of data without requiring the overhead of a full four-step RACH procedure to establish a connection (when the four-step RACH message may be larger than the payload).

[0087] The two-step RACH procedure can operate in any RRC state and any supported cell size. Networks using the two-step RACH procedure can generally support contention-based random access (CBRA) transmission of messages (e.g., msgA) within a limited range of payload sizes and a limited number of modulation and coding scheme (MCS) levels.

[0088] In some cases, some msgA transmissions may not be reliably transmitted in certain msgA transmission opportunities. For example, the specific RO and PRU selected to transmit a given payload may affect reliability.

[0089] However, aspects of the present disclosure provide techniques for verifying msgA transmission timing, which can help increase the reliability of msgA transmission. These verification rules can, for example, consider various factors, such as the causal relationship associated with SSB and message transmission timing, link level quality, content and size of message payload, and consistency of UE capabilities, either individually or collectively.

[0090] Fig.10 is a flow diagram illustrating example operations 1000 for wireless communications in accordance with certain aspects of the present disclosure. Operations 1000 may be performed, for example, by a UE (eg, such as UE 120a in wireless communication network 100) to verify a random access message (eg, msgA) transmission opportunity.

[0091] Operations 1000 begin at 1005 by selecting a random access message transmission opportunity for a preamble and a payload of a random access message, wherein the random access message transmission opportunity includes a preamble opportunity and a payload opportunity.

[0092] At 1010, the UE selects a preamble sequence for a preamble to be transmitted at a preamble opportunity of a random access message transmission opportunity of a two-step random access channel (RACH) procedure.

[0093] At 1015, the UE 120 selects at least one resource unit for transmitting the payload at the payload opportunity. In certain aspects, the payload is transmitted via a physical uplink shared channel (PUSCH); and the RU may be a PUSCH RU (PRU).

[0094] At 1020, the UE 120 verifies the selected random access message transmission opportunity based on one or more criteria.

[0095] At 1025, if the selected random access message transmission opportunity is verified, the UE 120 transmits the preamble sequence and the payload at the selected message transmission opportunity.

[0096] Operation 1000 also includes receiving configuration information for the two-step RACH procedure. The configuration information may indicate a set of preamble sequences, including the selected preamble sequence; a set of preamble opportunities for transmitting the selected preamble sequence, including the preamble opportunity; and a set of RUs including the selected RU.

[0097] In some cases, if the selected message transmission is not verified, the UE can be configured to fall back to using the four-step RACH procedure. In other cases, the UE 120 can be configured to retry the two-step RACH procedure (eg, using a different time-frequency allocation).

[0098] As described above, when verifying the random access message (msgA) transmission timing, the UE may consider one or more of a plurality of criteria. In some examples, the criteria may include any of the following: the selected message transmission timing occurs within the transmission interval of the uplink (UL) symbol; the selected message transmission timing occurs after a synchronization signal block (SSB) transmission, wherein the SSB transmission is associated with the selected preamble sequence and the selected RU; the selected message transmission is completed before the system information changes; and no SSB transmission occurs within the selected message transmission timing.

[0099] Fig.11A and Fig. 11B is a graphical representation of example conditions or criteria for valid message transmission opportunities for system information delivery according to certain aspects of the present disclosure. As shown, the msgA transmission opportunity includes a first transmission interval, a message preamble, a first guard time, a second transmission interval, a message payload, and a second guard time.

[0100] Fig.11A and Fig. 11B Both assume that the msgA transmission occurs within the transmission interval of the UL symbol. Fig.11A and Fig. 11B It also shows how valid msgA transmission opportunities may need to occur between adjacent SSB transmissions (eg, SSB transmissions occur between them). Fig.11A It is additionally shown that the msgA transmission opportunity should be completed before the system information changes. This makes sense because the SSB transmission may include the cell definition information on which the msgA transmission is based (so the msgA should be sent before the system information changes).

[0101] In some cases, the criteria for validating the selected msgA transmission opportunity may involve link-level quality metrics and payload size. In such aspects, the link-level quality metrics may be based on signal quality measurements of synchronization signal blocks (SSB) transmissions (e.g., signal-to-noise ratio) or additional signals.

[0102] A UE is typically provided with N synchronization signal (SS) and / or physical broadcast channel (PBCH) blocks (SSBs), each SSB being associated with one msgA opportunity. If N is less than 1, then one SS block may be mapped to A set of message RACH opportunities (RO) and message physical resource units (PRUs). If N is greater than or equal to 1, then N consecutive SS blocks can be mapped to a set of message RO and message PRUs (e.g., in this case, the UE can select the same RO / PRU regardless of which N SSBs it detects).

[0103] In some cases, the strength of the detected SSB may affect the criteria for verifying the timing of msgA transmission. For example, M signal quality measurement thresholds (S i ), sorted in ascending order (for example, S1 <S2<...S M ), and similarly, the range of supported payload sizes (e.g., K bits) of a message (e.g., msgA) can be divided into M levels, which can also be sorted in ascending order (e.g., K1 <K2<...K M ).

[0104] In some cases, the validation criteria may involve a signal quality measurement (S i ) is above a first threshold level. The first threshold level may be based on the size of the payload. As described above, the supported payload sizes may be divided into multiple levels, and the determination of the threshold level may depend on the signal quality measurement required for the target payload size.

[0105] For example, if the UE's signal quality measurement value is not less than S m , and the target payload size is no larger than K m bytes, the UE may select an appropriate set of preambles RO and PRU from the available message opportunities to perform a 2-step RACH procedure. Otherwise, the UE may skip the selected (or current) message transmission opportunity.

[0106] In certain aspects, the validation criteria may depend on at least one of a maximum power of the UE and a bandwidth available for the selected message transmission opportunity.

[0107] Fig.12 A call flow between a UE and a BS is shown, where the UE uses the validation rules of the two-step RACH procedure based on link level quality and payload size evaluation as described above.

[0108] As shown, the BS may broadcast SSBs, system information blocks (SIBs), and reference signals (RSs) with system information (or RRC signaling) having configuration information for a two-step RACH procedure. As shown, the UE performs a layer 1 (L1) reference signal received power (RSRP) measurement (e.g., of the SSB).

[0109] As described above, the UE may select a msgA opportunity (associated with a detected SSB) and evaluate (validate) the selected msgA opportunity based on the L1-RSRP measurement and the size of the msgA payload. In some cases, the evaluation may also take into account other factors such as the maximum transmission power, the available bandwidth of the UE, and whether the potential payload size of the message matches the configuration of the message transmission opportunity.

[0110] As shown, if the selected msgA transmission opportunity is found to be verified, the UE may transmit msgA at the selected message transmission opportunity. Once the BS receives the message from the UE, the BS may send a second message (msgB), for example, if it detects the msgA preamble and / or payload.

[0111] On the other hand, if the msgA transmission opportunity is found to be invalid, the UE may retry the two-step RACH procedure with a subsequent message transmission opportunity. Alternatively, the UE may switch to the four-step RACH procedure.

[0112] In some cases, the criteria for verifying the selected msgA transmission opportunity may involve the processing capabilities of the UE. For example, the processing capabilities of the UE involved in the verification may involve the processing time of PDCCH and / or PDSCH, the preparation time of PUSCH, the available bandwidth of the UE for message transmission opportunities, and the maximum transmission power of the UE. The verification may also involve the ability of the UE to adapt to changes in parameter sets (e.g., subcarrier spacing (SCS)), bandwidth parts (BWP), and transmit power adaptation. The verification may also involve the ability of the UE to support carrier aggregation (CA), dual connectivity (DC), and supplementary uplink (SUL), the ability of the UE to support a specified MCS, and / or the ability to support a waveform for a two-step RACH process.

[0113] Such UE processing capability may affect one or more timing intervals of message transmission opportunities. Fig.11A and Fig. 11B , UE processing capabilities can affect the timing interval between the SSB transmission associated with the selected preamble sequence and the start of the preamble opportunity at which the preamble sequence will be sent (TX interval #1).

[0114] In this case, if the duration of TX interval #1 is greater than or equal to a threshold, then the validation criteria involving the timing interval may be considered met, which may depend on various factors. For example, the threshold may depend on at least one of a reference SCS or a PUSCH parameter set associated with the active BWP of the payload.

[0115] In some cases, the timing interval may have N gap1a or N gap1bThe size of , refers to the number of symbols before the message preamble opportunity. For the initial transmission of msgA in CBRA mode, the msgA preamble may need to be at least N after the last SSB symbol or any other DL symbol. gap1-a Symbol starts. N gap1-a The value of may depend on the format of the message preamble / SCS and the preparation time of the message PUSCH, which may be signaled by RRC / SI or may be fixed (e.g., hard-coded). For retransmissions of msgA, or PDCCH-ordered msgA transmissions, msgA may be received at least N times after the last DL symbol is received. gap1-b Symbol starts. N gap1-b It can be signaled by RRC / SI or can be fixed. gap1-b The size of may depend on various factors, such as BWP or UL carrier switching (e.g., CA / DC / SUL) time (if any), PDCCH or PDSCH processing time, msgAPUSCH preparation time and / or the format / SCS of the msgA preamble.

[0116] Return to reference Fig.11A and Fig. 11B , the UE processing capability may affect the timing interval (TX interval #2) after the msgA preamble (e.g., between the end of the preamble opportunity to transmit the preamble sequence and the beginning of the payload opportunity to send the payload sequence). In this case, the validation criteria involving the timing interval may be considered met if the duration of the timing interval is greater than or equal to a threshold. The threshold may depend, for example, on at least one of a reference SCS or a PUSCH parameter set associated with an active uplink BWP for the payload.

[0117] In some cases, the message PRU may need to be at least N after the message preamble. gap2 Symbol starts. N gap2 The size of N may be signaled via RRC and / or system information (SI), or may be fixed. gap2 The size of may depend on various factors, such as the difference in parameter sets between preamble and PRU, the transmit power offset between preamble and PRU, additional preparation time for PUSCH, UE-specific time staggering pattern if any (e.g., timeslot transmission designed to accommodate more UEs), and / or the listen-before-talk (LBT) result of NR-U.

[0118] As described herein, techniques for verifying the timing of msgA transmissions (based on factors such as the causal relationship of SSB to message transmission timing, link-level quality, content and size of message payload, and consistency of UE capabilities) can help increase the reliability of msgA transmissions.

[0119] Fig.13 A communication device 1300 is shown, which may include devices configured to perform operations of the techniques disclosed herein (such as Fig.10 1300 ). The communication device 1300 includes a processing system 1302 coupled to a transceiver 1308. The transceiver 1308 is configured to transmit and receive signals, such as the various signals described herein, for the communication device 1300 via an antenna 1310. The processing system 1302 may be configured to perform processing functions for the communication device 1300, including processing signals received and / or transmitted by the communication device 1300.

[0120] The processing system 402 includes a processor 1304 coupled to a computer readable medium / memory 1312 via a bus 1306. In some aspects, the computer readable medium / memory 1312 is configured to store instructions (e.g., computer executable code) that, when executed by the processor 1304, cause the processor 1304 to perform Fig.10The operations shown, or other operations of the various techniques discussed herein for verifying the random access message transmission timing. In some aspects, the computer-readable medium / memory 1312 stores code 1314 for selecting a random access message transmission timing for a preamble and a payload of a random access message; code 1316 for selecting a preamble sequence to be transmitted at a preamble timing of the random access message transmission timing; code 1318 for selecting at least one resource unit (RU) for transmitting a payload at a payload transmission timing; code 1320 for verifying the selected random access message transmission timing based on one or more criteria; and code 1322 for transmitting the preamble sequence and the payload at the selected message transmission timing if the selected message transmission timing is verified. In some aspects, the processor 1304 has circuitry configured to implement the code stored in the computer-readable medium / memory 1312. Processor 1304 includes circuit 1330 for selecting a random access message transmission timing for a preamble and a payload of the random access message; circuit 1332 for selecting a preamble sequence to be transmitted at a preamble timing of the random access message transmission timing, circuit 1334 for selecting at least one resource unit (RU) to transmit a payload at a payload transmission timing; circuit 1336 for verifying the selected random access message transmission timing based on one or more criteria; and circuit 1338 for transmitting the preamble sequence and the payload at the selected message transmission timing if the selected message transmission timing is verified.

[0121] The technology described herein can be used for various wireless communication technologies, such as NR wireless communication (e.g., 5G NR wireless communication), 3GPP Long Term Evolution (LTE), LTE-Advanced (LTE-A), Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SCFDMA), Time Division Synchronous Code Division Multiple Access (TD-SCDMA), and other networks. The terms "network" and "system" are often used interchangeably. A CDMA network can implement radio technologies such as Universal Terrestrial Radio Access (UTRA), cdma2000, and the like. UTRA includes Wideband CDMA and other variants of CDMA. cdma2000 covers IS-2000, IS-95, and IS-856 standards. A TDMA network can implement radio technologies such as Global System for Mobile Communications (GSM). An OFDMA network may implement radio technologies such as NR (e.g., 5G RA), Evolved UTRA (E-UTRA), Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash OFDMA, etc. UTRA and E-UTRA are part of the Universal Mobile Telecommunications System. LTE and LTE-A are versions of UMTS that use E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A, and GSM are described in documents from an organization named "3rd Generation Partnership Project" (3GPP). cdma2000 and UMB are described in documents from an organization named "3rd Generation Partnership Project 2" (3gpp 2). NR is an emerging wireless communication technology under development.

[0122] The techniques described herein can be used for the above wireless networks and radio technologies as well as other wireless networks and radio technologies. For clarity, although various aspects may be described herein using terms commonly associated with 3G, 4G and / or 5G wireless technologies, various aspects of the present disclosure may be applied to communication systems based on other generations.

[0123] In 3GPP, the term "cell" can refer to the coverage area of ​​a Node B (NB) and / or a NB subsystem serving the coverage area, depending on the context in which the term is used. In NR systems, the terms "cell" and BS, next-generation NodeB (gNB or gNodeB), access point (AP), distributed unit (DU), carrier or transmit receive point (TRP) can be used interchangeably. The BS can provide communication coverage for macro cells, pico cells, femto cells and / or other types of cells. A macro cell can cover a relatively large geographic area (e.g., a radius of several kilometers) and can allow unrestricted access to UEs with service subscriptions. A pico cell can cover a relatively small geographic area and can allow unrestricted access to UEs with service subscriptions. A femto cell can cover a relatively small geographic area (e.g., a home) and can allow UEs associated with the femto cell (e.g., UEs in a closed subscriber group (CSG), UEs of users in a home, etc.) to have restricted access. The BS of a macro cell can be called a macro BS. The BS of a pico cell can be called a pico BS. The BS of a femto cell can be called a femto BS or a home BS.

[0124] UE may also be referred to as a mobile station, terminal, access terminal, subscriber unit, station, customer premises equipment (CPE), cellular phone, smart phone, personal digital assistant (PDA), wireless modem, wireless communication device, handheld device, laptop computer, cordless phone, wireless local loop (WLL) station, tablet computer, camera, gaming device, netbook, smartbook, ultrabook, appliance, medical device or medical equipment, biosensor / device, wearable device such as smart watch, smart clothing, smart glasses, smart wristband, smart jewelry (e.g., smart ring, smart bracelet, etc.), entertainment device (e.g., music device, video device, satellite radio, etc.), vehicle component or sensor, smart meter / sensor, industrial manufacturing equipment, global positioning system device, or any other suitable device configured to communicate via wireless or wired medium. Some UEs may be considered as MTC devices or evolved MTC (eMTC) devices. MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, location tags, etc., which can communicate with a BS, another device (e.g., remote device), or some other entity. For example, a wireless node may provide connectivity for or to a network (e.g., a wide area network such as the Internet or a cellular network) via a wired or wireless communication link. Some UEs may be considered Internet of Things (IoT) devices, which may be narrowband IoT (NB-IoT) devices.

[0125] Some wireless networks (e.g., LTE) utilize orthogonal frequency division multiplexing (OFDM) on the downlink and single carrier frequency division multiplexing (SC-FDM) on the uplink. OFDM and SC-FDM divide the system bandwidth into multiple (K) orthogonal subcarriers, which are also commonly referred to as single tones, frequency bands, etc. Each subcarrier can be modulated with data. Typically, modulation symbols are sent in the frequency domain using OFDM, and modulation symbols are sent in the time domain using SC-FDM. The spacing between adjacent subcarriers can be fixed, and the total number of subcarriers (K) can depend on the system bandwidth. For example, the spacing of the subcarriers can be 15kHz, and the minimum resource allocation (called a "resource block") can be 12 subcarriers (or 180kHz). Therefore, for system bandwidths of 1.25, 2.5, 5, 10, or 20 megahertz (MHz), the nominal fast Fourier transform (FFT) size can be equal to 128, 256, 512, 1024, or 2048, respectively. The system bandwidth can also be divided into subbands. For example, a subband may cover 1.08 MHz (eg, 6 RBs), and there may be 1, 2, 4, 8, or 16 subbands for system bandwidths of 1.25, 2.5, 5, 10, or 20 MHz, respectively.In LTE, the basic transmission time interval (TTI) or packet duration is a 1 ms subframe.

[0126] NR can utilize OFDM with CP on both the uplink and downlink, and includes support for half-duplex operation using TDD. In NR, the subframe is still 1ms, but the basic TTI is called a time slot. Depending on the subcarrier spacing, the subframe contains a variable number of time slots (e.g., 1, 2, 4, 8, 16, ... time slots). NR RB is 12 consecutive frequency subcarriers. NR can support a basic subcarrier spacing of 15kHz, and other subcarrier spacings such as 30kHz, 60kHz, 120kHz, 240kHz, etc. can be defined relative to the basic subcarrier spacing. Symbol and time slot lengths vary with subcarrier spacing. The CP length also depends on the subcarrier spacing. Beamforming can be supported, and the beam direction can be dynamically configured. MIMO transmission with precoding can also be supported. In some examples, the MIMO configuration in DL can support up to 8 transmit antennas, with up to 8 streams and multi-layer DL transmissions for each UE with up to 2 streams. In some examples, multi-layer transmissions with up to 2 streams per UE can be supported. Aggregation of multiple cells up to 8 serving cells can be supported.

[0127] In some examples, access to the air interface can be scheduled. The scheduling entity (e.g., BS) allocates resources for communications between some or all devices and equipment within its service area or cell. The scheduling entity may be responsible for scheduling, allocating, reconfiguring, and releasing resources for one or more subordinate entities. That is, for scheduled communications, the subordinate entity utilizes the resources allocated by the scheduling entity. The BS is not the only entity that can act as a scheduling entity. In some examples, the UE may act as a scheduling entity and may schedule resources for one or more subordinate entities (e.g., one or more other UEs), and other UEs may use the resources scheduled by the UE for wireless communications. In some examples, the UE may act as a scheduling entity in a peer-to-peer (P2P) network and / or a mesh network. In the mesh network example, in addition to communicating with the scheduling entity, the UEs may also communicate directly with each other.

[0128] In some examples, two or more slave entities (e.g., UEs) can communicate with each other using sidelink signals. Real-world applications of such sidelink communications may include public safety, proximity services, UE-to-network relay, vehicle-to-vehicle (V2V) communications, Internet of Everything (IoE) communications, IoT communications, mission-critical grids, and / or various other suitable applications. In general, a sidelink signal may refer to a communication transmitted from one slave entity (e.g., UE 1) to another slave entity (e.g., UE2) without relaying the communication through a scheduling entity (e.g., UE or BS), even though the scheduling entity may be used for scheduling and / or control purposes. In some examples, the sidelink signal may be transmitted using licensed spectrum (unlike wireless LANs, which typically use unlicensed spectrum).

[0129] The methods disclosed herein include one or more steps or actions for implementing these methods. Without departing from the scope of the claims, the method steps and / or actions can be interchangeable with each other. In other words, unless a specific order of steps or actions is specified, the order and / or use of specific steps and / or actions can be modified without departing from the scope of the claims.

[0130] As used herein, a phrase referring to "at least one of" a list of items refers to any combination of those items, including single members. For example, "at least one of a, b, or c" is intended to cover a, b, c, ab, ac, bc, and abc, as well as any combination of multiples of the same element (e.g., aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, cc, and ccc, or any other order of a, b, c).

[0131] As used herein, the term "determining" includes a variety of actions. For example, "determining" may include calculating, estimating, processing, deriving, investigating, searching (e.g., searching in a table, a database, or another data structure), ascertaining, etc. In addition, "determining" may include receiving (e.g., receiving information), accessing (e.g., accessing data in a memory), etc. In addition, "determining" may include resolving, selecting, choosing, establishing, etc.

[0132] The foregoing description is provided to enable any person skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects. Therefore, the claims are not intended to be limited to the aspects shown herein, but to conform to the full scope consistent with the language of the claims, wherein unless otherwise stated, the reference to the elements in the singular form is not intended to represent "one and only one", but "one or more". Unless otherwise specified, the term "some" refers to one or more. All structural and functional equivalents of the elements throughout the various aspects described in the present disclosure that are known or will be known to those of ordinary skill in the art are expressly incorporated herein by reference and are intended to be included in the claims. In addition, regardless of whether such disclosure is explicitly stated in the claims, the contents disclosed herein are not intended to be dedicated to the public. Any claim element cannot be interpreted according to the provisions of Section 112 (f) of Title 35 of the United States Code unless the element is explicitly stated using the phrase "for", or in the case of a method claim, the element is stated using the phrase "step for".

[0133] The various operations of the above method can be performed by any suitable device capable of performing the corresponding functions. The device may include various hardware and / or software components and / or modules, including but not limited to circuits, application specific integrated circuits (ASICs) or processors. Generally, where operations are shown in the figures, these operations may have corresponding device-plus-function components with similar numbers.

[0134] The various illustrative logical blocks, modules, and circuits described in conjunction with the present disclosure may be implemented or performed with a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device (PLD), discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but alternatively, the processor may be any commercially available processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, a plurality of microprocessors, a combination of one or more microprocessors with a DSP core, or any other such configuration.

[0135] If implemented in hardware, an example hardware configuration may include a processing system in a wireless node. The processing system may be implemented using a bus architecture. Depending on the specific application of the processing system and the overall design constraints, the bus may include any number of interconnecting buses and bridges. The bus may link various circuits (including processors, machine-readable media, and bus interfaces) together. The bus interface may be used to connect a network adapter, etc., to the processing system via the bus. The network adapter may be used to implement the signal processing functions of the PHY layer. In the user terminal 120 (see Figure 1 ), a user interface (e.g., keyboard, display, mouse, joystick, etc.) may also be connected to the bus. The bus may also link various other circuits, such as timing sources, peripherals, voltage regulators, power management circuits, etc., which are well known in the art and are not described further. The processor may be implemented using one or more general and / or special purpose processors. Examples include microprocessors, microcontrollers, DSP processors, and other circuits that can execute software. Those skilled in the art will recognize how to best implement the functionality of the described processing system depending on the specific application and the overall design constraints imposed on the entire system.

[0136] If implemented in software, these functions can be stored or transmitted as one or more instructions or codes on a computer-readable medium. Software should be broadly understood as instructions, data, or any combination thereof, whether it refers to software, firmware, middleware, microcode, hardware description language, or other. Computer-readable media include computer storage media and communication media, and communication media include any media that facilitates the transfer of computer programs from one place to another. The processor can be responsible for managing the bus and general processing, including executing software modules stored on a machine-readable storage medium. The computer-readable storage medium can be coupled to the processor so that the processor can read information from the storage medium and write information to the storage medium. Alternatively, the storage medium can be integrated into the processor. For example, the machine-readable medium may include a transmission line, a carrier modulated by data, and / or a computer-readable storage medium with instructions stored thereon separated from the wireless node, all of which can be accessed by the processor through a bus interface. Alternatively or additionally, the machine-readable medium or any part thereof can be integrated into the processor, such as in the case of a cache and / or a general register file. For example, examples of machine-readable storage media may include random access memory (RAM), flash memory, read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), registers, magnetic disks, optical disks, hard disks, or any other suitable storage media or any combination thereof. Machine-readable media may be included in a computer program product.

[0137] A software module may include a single instruction or multiple instructions and may be distributed across several different code segments, between different programs, and across multiple storage media. A computer-readable medium may include multiple software modules. A software module includes instructions that, when executed by a device such as a processor, cause a processing system to perform various functions. A software module may include a sending module and a receiving module. Each software module may reside in a single storage device or be distributed across multiple storage devices. For example, when a triggering event occurs, a software module may be loaded from a hard drive into a RAM. During the execution of a software module, the processor may load some instructions into a cache to increase access speed. Then, one or more cache lines may be loaded into a general register file for execution by the processor. When referring to the functions of the following software modules, it should be understood that such functions are implemented by the processor when executing instructions from the software module.

[0138] Additionally, any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a website, server or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies (such as infrared (IR), radio and microwave), then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies (such as infrared, radio and microwave) are included in the definition of medium. Disk and disc, as used herein, include compact disk (CD), laser disk, optical disk, digital versatile disk (DVD), floppy disk and Optical disks, where disks typically reproduce data magnetically, and discs reproduce data optically with lasers. Thus, in some aspects, computer-readable media may include non-transitory computer-readable media (e.g., tangible media). Additionally, for other aspects, computer-readable media may include transitory computer-readable media (e.g., signals). Combinations of the above should also be included within the scope of computer-readable media.

[0139] Thus, certain aspects may include a computer program product for performing the operations presented herein. For example, such a computer program product may include a computer-readable medium having instructions stored (and / or encoded) thereon, the instructions being executable by one or more processors to perform the operations described herein, for example, for performing the operations described herein and in Fig.10 The operations are shown in the instructions.

[0140] In addition, it should be understood that the modules and / or other suitable devices for performing the methods and techniques described herein can be downloaded and / or otherwise obtained by the user terminal and / or base station. For example, such a device can be coupled to a server to facilitate the transfer of the device for performing the methods described herein. Alternatively, the various methods described herein can be provided by a storage device (e.g., RAM, ROM, a physical storage medium such as a compact disk (CD) or a floppy disk, etc.), so that the user terminal and / or BS can obtain the various methods when the storage device is coupled or provided to the device. In addition, any other suitable technology for providing the methods and techniques described herein to the device can be utilized.

[0141] It is to be understood that the claims are not limited to the precise configuration and components described above. Various modifications, changes and variations may be made in the arrangement, operation and details of the methods and apparatus described above without departing from the scope of the claims.

Claims

1. A method for wireless communication by a user equipment UE, comprising: Selecting a random access message transmission opportunity for a preamble and a payload of the random access message, the random access message transmission opportunity comprising a preamble opportunity and a payload opportunity; selecting a preamble sequence for the preamble to transmit at the preamble timing of the random access message transmission timing of a two-step random access channel RACH procedure; Selecting at least one resource unit RU for transmitting the payload at the payload opportunity; verifying the selected random access message transmission opportunity based on one or more criteria; as well as If the selected random access message transmission opportunity is verified, the preamble sequence and the payload are transmitted at the selected message transmission opportunity.

2. The method according to claim 1, further comprising receiving configuration information of the two-step RACH process, the configuration information indicating: a set of preamble sequences including the selected preamble sequence; a set of preamble opportunities for transmitting the selected preamble sequence, the set of preamble opportunities including the preamble opportunity; and The set of RUs including the selected RU.

3. The method according to claim 1, wherein: The payload is transmitted via a physical uplink shared channel PUSCH; and The at least one RU includes at least one PUSCH RU (PRU).

4. The method of claim 1, wherein the UE is configured to fall back to using the four-step RACH procedure if the selected message transmission is not verified, or to retry the two-step RACH procedure under a different time / frequency allocation.

5. The method of claim 1 , wherein the one or more criteria include one or more of the following: The selected message transmission opportunity occurs within the transmission interval of the UL symbol; The selected message transmission opportunity occurs after a synchronization signal block (SSB) transmission, wherein the SSB transmission is associated with the selected preamble sequence and the selected RU; The selected message transmission timing is completed before the system information is changed; and No SSB transmission occurred during the selected message transmission opportunity.

6. The method of claim 1, wherein the one or more criteria relate to a link level quality metric and a size of the payload.

7. The method of claim 6, wherein the link level quality metric is based on a signal quality measurement of at least one of a synchronization signal block (SSB) transmission or other reference signals.

8. The method of claim 7, wherein the one or more criteria include: The signal quality measurement is above a first threshold level.

9. The method of claim 8, wherein the first threshold level is based on a size of the payload.

10. The method of claim 9, wherein the payload size is divided into a plurality of levels, and the determination of the threshold level depends on a required signal-to-noise ratio for the target payload size.

11. The method of claim 6, wherein the one or more criteria are further dependent on at least one of a maximum power of the UE and an available bandwidth of the selected message transmission opportunity.

12. The method of claim 1, wherein the one or more criteria relate to processing capabilities of the UE.

13. The method according to claim 12, wherein the processing capability of the UE relates to: Processing time of the physical downlink control channel PDCCH and / or the physical downlink shared channel PDSCH; PUSCH preparation time; a bandwidth available to the UE for the message transmission opportunity and a maximum transmission power of the UE; UE parameter set, bandwidth part BWP and transmit power adaptation capability; The UE supports carrier aggregation CA, dual connectivity DC and supplementary uplink SUL capabilities; and The UE shall support the specified modulation and coding scheme (MCS) and waveform capability for the two-step RACH procedure.

14. The method of claim 12, wherein the one or more criteria relate to a timing interval between: Synchronization Signal Block (SSB) transmission associated with the selected preamble sequence and the selected RU; and The start of the preamble opportunity where the preamble sequence will be transmitted.

15. The method of claim 14, wherein one or more criteria related to the timing interval are satisfied if the duration of the timing interval is greater than or equal to a threshold value.

16. The method of claim 15, wherein the threshold depends on at least one of a reference subcarrier spacing (SCS) and a PUSCH parameter set associated with an active uplink BWP of the payload.

17. The method of claim 12, wherein the one or more criteria relate to a timing interval between: an end of a preamble opportunity in which the preamble sequence is to be transmitted; and The start of a payload opportunity in which the payload is to be transmitted.

18. The method of claim 17, wherein one or more criteria related to the timing interval are satisfied if the duration of the timing interval is greater than or equal to a threshold value.

19. The method of claim 18, wherein the threshold depends on at least one of a reference subcarrier spacing (SCS) and a PUSCH parameter set associated with an active uplink BWP of the payload.

20. An apparatus comprising: A processor and a memory configured to: Selecting a random access message transmission opportunity for a preamble and a payload of the random access message, the random access message transmission opportunity comprising a preamble opportunity and a payload opportunity; selecting a preamble sequence for the preamble to transmit at the preamble timing of the random access message transmission timing of a two-step random access channel RACH procedure; Selecting at least one resource unit RU for transmitting the payload at the payload opportunity; verifying the selected random access message transmission opportunity based on one or more criteria; as well as If the selected random access message transmission opportunity is verified, the preamble sequence and the payload are transmitted at the selected message transmission opportunity.

21. An apparatus for wireless communication, comprising: means for selecting a random access message transmission opportunity for a preamble and a payload of the random access message, wherein the random access message transmission opportunity comprises a preamble opportunity and a payload opportunity; means for selecting a preamble sequence for said preamble for transmission at said preamble opportunity of said random access message transmission opportunity of a two-step random access channel RACH procedure; means for selecting at least one resource unit RU for transmitting said payload at said payload opportunity; means for validating the selected random access message transmission opportunity based on one or more criteria; and means for transmitting the preamble sequence and the payload at the selected random access message transmission opportunity if the selected random access message transmission opportunity is verified.

22. The apparatus of claim 21, further comprising means for receiving configuration information for the two-step RACH procedure, the configuration information indicating: a set of preamble sequences including the selected preamble sequence; a set of preamble opportunities for transmitting the selected preamble sequence, the set of preamble opportunities including the preamble opportunity; and The set of RUs including the selected RU.

23. The apparatus of claim 21, wherein: The payload is transmitted via a physical uplink shared channel PUSCH; and The at least one RU includes at least one PUSCH RU (PRU).

24. The apparatus of claim 21, wherein the apparatus is configured to fall back to using a four-step RACH procedure if the selected message transmission is not verified, or to retry the two-step RACH procedure under a different time / frequency allocation.

25. The apparatus of claim 21, wherein the one or more criteria include one or more of the following: The selected message transmission opportunity occurs within the transmission interval of the UL symbol; The selected message transmission opportunity occurs after a synchronization signal block (SSB) transmission, wherein the SSB transmission is associated with the selected preamble sequence and the selected RU; The selected message transmission timing is completed before the system information is changed; and No SSB transmission occurred during the selected message transmission opportunity.

26. The apparatus of claim 21, wherein the one or more criteria relate to a link level quality metric and a size of a payload, wherein the link level quality metric is based on a signal quality measurement of at least one of a synchronization signal block transmission or other reference signal; wherein the one or more criteria include a signal quality measurement being above a first threshold level based on payload size, wherein the payload size is divided into a plurality of levels, and the determination of the threshold level is dependent upon a desired signal-to-noise ratio for a target payload size; The one or more criteria are further dependent on at least one of a maximum power of the device and an available bandwidth of the selected message transmission opportunity.

27. The apparatus of claim 21, wherein the one or more criteria relate to processing capabilities of the apparatus.

28. The apparatus of claim 27, wherein the one or more criteria relate to a timing interval between: a synchronization signal block transmission associated with the selected preamble sequence and the selected RU; and The start of a preamble opportunity in which the preamble sequence is to be transmitted, wherein one or more criteria related to the timing interval are satisfied if the duration of the timing interval is greater than or equal to a threshold, wherein the threshold depends on at least one of a reference subcarrier spacing SCS associated with an active uplink BWP of the payload and a PUSCH parameter set.

29. The apparatus of claim 27, wherein the one or more criteria relate to a timing interval between: an end of a preamble opportunity in which said preamble sequence is to be transmitted; and The invention relates to a method for transmitting a payload of a datagram or a stream of data packets transmitted by a user of the payload, wherein the method comprises: providing a timing interval for transmitting a payload of the payload to a user of the payload, wherein the timing interval comprises a start of a payload opportunity to transmit the payload, wherein one or more criteria relating to the timing interval are satisfied if the duration of the timing interval is greater than or equal to a threshold, wherein the threshold depends on at least one of a reference subcarrier spacing SCS associated with an active uplink BWP of the payload and a PUSCH parameter set.

30. A computer-readable medium having stored thereon computer-executable instructions for: Selecting a random access message transmission opportunity for a preamble and a payload of the random access message, the random access message transmission opportunity comprising a preamble opportunity and a payload opportunity; selecting a preamble sequence for the preamble to transmit at the preamble timing of the random access message transmission timing of a two-step random access channel RACH procedure; Selecting at least one resource unit RU for transmitting the payload at the payload opportunity; verifying the selected random access message transmission opportunity based on one or more criteria; as well as If the selected random access message transmission opportunity is verified, the preamble sequence and the payload are transmitted at the selected message transmission opportunity.

Images