Techniques and apparatuses for multiple types of physical random access channel (PRACH) transmissions

Abstract

A user equipment (UE) can perform a random access procedure to synchronize with a network for uplink and / or downlink communications. The UE can transmit: a first type of random access transmission that includes transmitting a preamble; or a second type of random access transmission that includes transmitting a preamble and a random access message. The second type can result in a reduced latency compared to the first type, but can have a lower SNR tolerance. In some aspects, the UE can determine whether to transmit the first type or the second type, and can transmit the first type or the second type in a random access channel portion of a slot. The random access channel portion of the slot can be occupied by portions of the first type random access transmissions or the second type random access transmissions, thereby enabling flexible utilization of multiple types of random access procedures.

Description

[0001] This application is a continuation of Chinese Patent Application No. 201780079207.4 (PCT / US2017 / 058729), filed October 27, 2017, and entitled "Techniques and Apparatus for Multiple Type of Physical Random Access Channel (PRACH) Transmission Utilization," which claims priority to U.S. Patent Application No. 15 / 836, 1 10, filed December 8, 2017, and entitled "Techniques and Apparatus for Multiple Type of Physical Random Access Channel (PRACH) Transmission Utilization." TECHNICAL FIELD

[0002] Aspects of the present disclosure relate generally to wireless communication, and more specifically to techniques and apparatus for multiple type of physical random access channel (PRACH) transmission utilization. BACKGROUND

[0003] Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasts. Typical wireless communication systems can employ multiple-access technologies capable of supporting communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.). Examples of such multiple-access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single-carrier frequency division multiple access (SC-FDMA) systems, time division synchronous code division multiple access (TD-SCDMA) systems, and Long Term Evolution (LTE). LTE / LTE-Advanced is a set of enhancements to the Universal Mobile Telecommunications System (UMTS) mobile standard promulgated by the Third Generation Partnership Project (3 GPP).

[0004] A wireless communication network can include a number of base stations (BSs) that can support communication for a number of user equipment (UEs). A UE can communicate with a BS via the downlink and uplink. The downlink (or forward link) refers to the communication link from the BS to the UE, and the uplink (or reverse link) refers to the communication link from the UE to the BS. As will be described in more detail, a BS can be referred to as a Node B, a gNB, an access point (AP), a radio head, a transmit receive point (TRP), a 5G BS, a 5G Node B, and / or the like.

[0005] The above multiple access technologies have been adopted in various telecommunication standards to provide common protocols that enable different wireless communication devices to communicate on a municipal, national, regional, and even global level. 5G is a set of enhancements to the LTE mobile standard promulgated by the Third Generation Partnership Project (3GPP). 5G is designed to better support mobile broadband Internet access by improving spectral efficiency, lowering costs, improving services, making use of new spectrum, and better integrating with other open standards using OFDM with cyclic prefix (CP) (CP-OFDM) on the downlink (DL), using CP-OFDM and / or SC-FDM (e.g., also known as discrete Fourier transform spread ODFM (DFT-s-OFDM)) on the uplink (UL), as well as supporting beamforming, multiple input multiple output (MIMO) antenna technology, and carrier aggregation. However, as the demand for mobile broadband access continues to increase, there exists a need for further improvements in LTE and 5G technologies. Preferably, these improvements should be applicable to other multiple access technologies and the telecommunication standards that employ these technologies.

[0006] A user equipment (UE) can perform a random access procedure to gain access to a network for uplink transmissions, downlink transmissions, and / or the like. To perform the random access procedure, the UE and a base station can exchange messages. For some UEs, a random access procedure, such as a physical random access channel (PRACH) random access procedure, can include transmitting multiple messages to the base station. For example, the UE can transmit a random access transmission including a preamble, can receive a response message from the base station, can transmit a random access transmission including a random access message, and can receive another response message from the base station. This can be referred to as a four-step random access procedure, and the initial random access transmission can be referred to as a first-type random access transmission. After completing the four message random access procedure, the UE can be synchronized to perform uplink and / or downlink transmissions. SUMMARY

[0007] A four-step random access procedure can result in excessive delay and / or excess network traffic. Thus, in 5G, a UE can combine transmission of a preamble and a random access message into a single random access transmission, the UE can receive a single response message for the single random access transmission. This can be referred to as a two-step random access procedure, and the random access transmission can be referred to as a second-type random access transmission. In this case, the UE can receive a single response message after transmitting the second-type random access transmission, and can be synchronized to perform uplink and / or downlink transmissions without another message exchange. In this way, the two-step random access procedure reduces the delay associated with connecting to a network.

[0008] The two-step random access procedure can require improved channel conditions relative to the four-step random access procedure. For example, when a UE transmits a second type random access transmission in a network having relatively poor channel conditions, such as a signal-to-noise ratio (SNR) that fails to satisfy a threshold, the second type random access transmission can not be received and / or decoded by a base station. In contrast, when the SNR fails to satisfy the threshold, the UE can transmit a first type random access transmission, and the first type random access transmission can be successfully received and / or decoded due to the reduced size of the first type random access transmission. Thus, it can be beneficial to permit utilization of multiple types of random access transmissions associated with multiple types of random access procedures in a network to account for different channel conditions.

[0009] Aspects described herein can enable utilization of multiple types of random access transmissions (e.g., physical random access channel (PRACH) transmissions) associated with two-step random access procedures, four-step random access procedures, and / or the like. A first type random access transmission or a second type random access transmission can be utilized based at least in part on, for example, channel conditions of a network. Thus, by enabling the first type random access transmission, the likelihood of failing to synchronize a user equipment (UE) to a network for uplink and / or downlink when channel conditions are relatively poor is reduced relative to permitting only the second type random access transmission in all channel conditions. Similarly, by enabling the second type random access transmission, the amount of time to synchronize a UE to a network when channel conditions are good is reduced relative to permitting only the first type random access transmission in all channel conditions.

[0010] In an aspect of the disclosure, a method, an apparatus, an equipment, and a computer program product are provided.

[0011] In some aspects, the method can include determining, by a user equipment, whether to transmit at least one of a first type random access transmission or a second type random access transmission within a random access channel portion of a slot. The first type random access transmission can include a preamble. The second type random access transmission can include a preamble and a random access message. The method can include transmitting, by the user equipment, the at least one of the first type random access transmission or the second type random access transmission within the random access channel portion of the slot.

[0012] In some aspects, the apparatus can include a memory and one or more processors coupled to the memory. The memory and the one or more processors can be configured to determine whether to transmit at least one of a first type of random access transmission or a second type of random access transmission within a random access channel portion of a slot. The first type of random access transmission can include a preamble. The second type of random access transmission can include a preamble and a random access message. The memory and the one or more processors can be configured to transmit the at least one of the first type of random access transmission or the second type of random access transmission within the random access channel portion of the slot.

[0013] In some aspects, the apparatus can include means for determining whether to transmit at least one of a first type of random access transmission or a second type of random access transmission within a random access channel portion of a slot. The first type of random access transmission can include a preamble. The second type of random access transmission can include a preamble and a random access message. The apparatus can include means for transmitting the at least one of the first type of random access transmission or the second type of random access transmission within the random access channel portion of the slot.

[0014] In some aspects, the computer program product can include a non-transitory computer- readable medium storing one or more instructions for wireless communication that, when executed by one or more processors of a device, cause the one or more processors to determine whether to transmit at least one of a first type of random access transmission or a second type of random access transmission within a random access channel portion of a slot. The first type of random access transmission can include a preamble. The second type of random access transmission can include a preamble and a random access message. The one or more instructions can cause the one or more processors to transmit the at least one of the first type of random access transmission or the second type of random access transmission within the random access channel portion of the slot.

[0015] In some aspects, the method can include monitoring for both a first type of random access transmission and a second type of random access transmission within a random access channel portion of a slot, wherein the first type of random access transmission includes a preamble, and wherein the second type of random access transmission includes a preamble and a random access message. The method can include receiving, from at least one user equipment, at least one of the first type of random access transmission or the second type of random access transmission within the random access channel portion of the slot based at least in part on the monitoring for both the first type of random access transmission and the second type of random access transmission.

[0016] In some aspects, the device may include a memory and one or more processors coupled to the memory. The memory and the one or more processors may be configured to monitor both a first type of random access transmission and a second type of random access transmission within a random access channel portion of a time slot, wherein the first type of random access transmission includes a preamble, and wherein the second type of random access transmission includes a preamble and a random access message. The memory and the one or more processors may be configured to receive at least one of the first type of random access transmission or the second type of random access transmission within a random access channel portion of a time slot, at least in part based on the monitoring of both the first type of random access transmission and the second type of random access transmission.

[0017] In some aspects, the apparatus may include: means for monitoring both a first type of random access transmission and a second type of random access transmission within a random access channel portion of a time slot, wherein the first type of random access transmission includes a preamble, and wherein the second type of random access transmission includes a preamble and a random access message. The apparatus may also include: means for receiving at least one of the first type of random access transmission or the second type of random access transmission within a random access channel portion of a time slot from at least one user equipment, based at least in part on monitoring both the first type of random access transmission and the second type of random access transmission.

[0018] In some aspects, the computer program product may include a non-transient computer-readable medium storing one or more instructions for wireless communication, which, when executed by one or more processors of the device, cause the one or more processors to: monitor both a first type of random access transmission and a second type of random access transmission within a random access channel portion of a time slot, wherein the first type of random access transmission includes a preamble, and wherein the second type of random access transmission includes a preamble and a random access message. The one or more instructions, when executed by the one or more processors, may cause the one or more processors to: receive at least one of the first type of random access transmission or the second type of random access transmission within a random access channel portion of a time slot, at least in part based on the monitoring of both the first type of random access transmission and the second type of random access transmission.

[0019] The aspects generally include, as described herein with reference to and illustrated in the accompanying drawings, methods, apparatus, systems, computer program products, non-transient computer-readable media, user equipment, wireless communication devices, base stations, access points, and processing systems.

[0020] The foregoing has broadly outlined the features and technical advantages of the examples according to this disclosure in an effort to facilitate a better understanding of the following detailed description. Additional features and advantages will be described thereafter. The disclosed concepts and specific examples can be readily used as the basis for modifications or the design of other structures for implementing the same purposes as this disclosure. Such equivalent constructions do not depart from the scope of the appended claims. The characteristics of the concepts disclosed herein, in both their organization and manner of operation, and their associated advantages, will be better understood by considering the following description in conjunction with the accompanying drawings. Each drawing is provided for illustrative and descriptive purposes and does not define any limitation on the claims. Attached Figure Description

[0021] Figure 1 This is a diagram illustrating an example of a wireless communication network.

[0022] Figure 2 This is a diagram illustrating an example of communication between a base station and a user equipment (UE) in a wireless communication network.

[0023] Figure 3A and 3B This is a diagram illustrating examples of various types of random access transmissions used in random access procedures, such as the Physical Random Access Channel (PRACH) procedure.

[0024] Figure 4 This is a diagram illustrating an example of a cell grid in an uplink-centric timeslot used for various types of random access transmissions.

[0025] Figures 5A-5E This is a diagram illustrating an example of resource allocation within a cell grid in an uplink-centric timeslot used for various types of random access transmissions.

[0026] Figures 6A-6C This is a diagram illustrating an example of resource allocation within a cell grid in an uplink-centric timeslot used for various types of random access transmissions.

[0027] Figure 7 This is a flowchart of a wireless communication method.

[0028] Figure 8 It is a conceptual data flow diagram that explains the data flow between different modules / devices / components in the example equipment.

[0029] Figure 9 This is a diagram illustrating an example of the hardware implementation of an equipment employing a processing system.

[0030] Figure 10 This is a flowchart of a wireless communication method.

[0031] Figure 11It is a conceptual data flow diagram that explains the data flow between different modules / devices / components in the example equipment.

[0032] Figure 12 This is a diagram illustrating an example of the hardware implementation of an equipment employing a processing system. Detailed Implementation

[0033] The detailed description that follows, taken in conjunction with the accompanying drawings, is intended as a description of various configurations and is not intended to imply any configuration in which the concepts described herein can be practiced. This detailed description includes specific details to provide a thorough understanding of the various concepts. However, it will be apparent to those skilled in the art that these concepts can be practiced without these specific details. In some instances, well-known structures and components are shown in block diagram form to avoid obscuring such concepts.

[0034] Several aspects of a telecommunications system will now be presented with reference to various equipment and methods. These equipment and methods will be described in detail below and explained in the accompanying drawings by various blocks, modules, components, circuits, steps, processes, algorithms, etc. (collectively, “elements”). These elements can be implemented using electronic hardware, computer software, or any combination thereof. Whether such elements are implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system.

[0035] As an example, an element, or any part of an element, or any combination of elements, may be implemented using a "processing system" comprising one or more processors. Examples of processors include microprocessors, microcontrollers, digital signal processors (DSPs), field-programmable gate arrays (FPGAs), programmable logic devices (PLDs), state machines, gated logic, discrete hardware circuits, and other suitable hardware configured to perform the various functionalities described throughout this disclosure. One or more processors in the processing system may execute software. Software should be broadly interpreted as instructions, instruction sets, code, code segments, program code, programs, subroutines, software modules, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description languages, or other terms.

[0036] Accordingly, in one or more example embodiments, the described functionality may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, these functions may be stored or encoded as one or more instructions or code on a computer-readable medium. A computer-readable medium includes a computer storage medium. The storage medium may be any available medium accessible to a computer. By way of example and not limitation, such computer-readable media may include random access memory (RAM), read-only memory (ROM), electrically erasable programmable ROM (EEPROM), compact disc ROM (CD-ROM) or other optical disk storage, magnetic disk storage or other magnetic storage devices, combinations of computer-readable media of the foregoing types, or any other medium that can be used to store computer-executable code in the form of instructions or data structures and is accessible to a computer.

[0037] An access point (“AP”) may include, be implemented as, or be referred to as: a B-node, a radio network controller (“RNC”), an evolved B-node (eNB), a base station controller (“BSC”), a base transceiver station (“BTS”), a base station (“BS”), a transceiver function (“TF”), a radio router, a radio transceiver, a basic service set (“BSS”), an extended service set (“ESS”), a radio base station (“RBS”), a B-node (NB), a gNB, a 5G NB, a 5G BS, a transmit / receive point (TRP), or some other term.

[0038] An access terminal (“AT”) may include, be implemented as, or be referred to as: an access terminal, subscriber station, subscriber unit, mobile station, remote station, remote terminal, user terminal, user agent, user equipment, user gear (UE), user station, wireless node, or some other term. In some aspects, an access terminal may include a cellular phone, smartphone, cordless phone, Session Initiation Protocol (“SIP”) phone, Wireless Local Loop (“WLL”) station, personal digital assistant (“PDA”), tablet, netbook, smartbook, ultrabook, handheld device with wireless connectivity, station (“STA”), or some other suitable processing device connected to a wireless modem. Accordingly, one or more aspects taught herein can be incorporated into telephones (e.g., cellular phones, smartphones), computers (e.g., desktop computers), portable communication devices, portable computing devices (e.g., laptops, personal data assistants, tablets, netbooks, smartbooks, ultrabooks), wearable devices (e.g., smartwatches, smart glasses, smart bracelets, smart wristbands, smart rings, smart clothing, etc.), medical devices or equipment, biometric sensors / devices, entertainment devices (e.g., music devices, video devices, satellite radios, gaming devices, etc.), automotive components or sensors, smart meters / sensors, industrial manufacturing equipment, GPS devices, or any other suitable device configured to communicate via wireless or wired media. In some aspects, a node is a wireless node. A wireless node may, for example, provide connectivity to or to a network (e.g., a wide area network, such as the Internet or cellular networks) via wired or wireless communication links. Some UEs may be considered machine-type communication (MTC) UEs, which may include remote devices capable of communicating with a base station, another remote device, or some other entity. Machine-type communication (MTC) can refer to communication involving at least one remote device at at least one end of the communication, and can include forms of data communication involving one or more entities that do not necessarily require human interaction. An MTC UE can include a UE capable of MTC communication with an MTC server and / or other MTC devices via, for example, a Public Land Mobile Network (PLMN). Examples of MTC devices include sensors, meters, location tags, monitors, drones, robots / robotic devices, and so on. MTC UEs, and other types of UEs, can be implemented as NB-IoT (Narrowband Internet of Things) devices.

[0039] It should be noted that although the aspects herein may be described using terms commonly associated with 3G and / or 4G wireless technologies, the aspects of this disclosure may be applied to communication systems based on other generations, including 5G technology (such as 5G and later generations).

[0040] Figure 1This is a diagram illustrating a network 100 in which various aspects of this disclosure can be practiced. Network 100 can be an LTE network or some other wireless network, such as a 5G network. Wireless network 100 may include several BSs 110 (shown as BS 110a, BS 110b, BS 110c, and BS 110d) and other network entities. A BS is an entity that communicates with a user equipment (UE) and may also be referred to as a base station, 5G BS, B-node, gNB, 5G NB, access point, TRP, etc. Each BS may provide communication coverage for a specific geographic area. In 3GPP, the term "cell" may refer to the coverage area of ​​a BS and / or the BS subsystem serving that coverage area, depending on the context in which the term is used.

[0041] A BS can provide communication coverage for macrocells, picocells, femtocells, and / or any type of cell. Macrocells can cover a relatively large geographic area (e.g., a radius of several kilometers) and allow unrestricted access by UEs with service subscriptions. Picocells can cover a relatively small geographic area and allow unrestricted access by UEs with service subscriptions. Femtocells can cover a relatively small geographic area (e.g., a residential area) and allow restricted access by UEs associated with that femtocell (e.g., UEs in a Closed Subscriber Group (CSG)). A BS used for macrocells may be referred to as a macro BS. A BS used for picocells may be referred to as a pico BS. A BS used for femtocells may be referred to as a femto BS or a home BS. Figure 1 In the example shown, BS110a can be a macro BS for macro cell 102a, BS 110b can be a pico BS for pico cell 102b, and BS 110c can be a femto BS for femto cell 102c. A BS can support one or more (e.g., three) cells. The terms “eNB,” “base station,” “5G BS,” “gNB,” “TRP,” “AP,” “B node,” “5G NB,” and “cell” are used interchangeably herein.

[0042] In some examples, the cell may not be stationary, and the geographical area of ​​the cell may move depending on the location of the mobile BS. In some examples, BSs may interconnect with each other and / or interconnect to one or more other BSs or network nodes (not shown) in access network 100 via various types of backhaul interfaces (such as direct physical connections, virtual networks, and / or similar devices using any suitable transport network).

[0043] The wireless network 100 may also include a relay station. A relay station is an entity capable of receiving data transmissions from an upstream station (e.g., a BS or a UE) and transmitting those data transmissions to a downstream station (e.g., a UE or a BS). A relay station can also be a UE capable of relaying transmissions for other UEs. Figure 1 In the example shown, relay station 110d can communicate with macro BS 110a and UE 120d to facilitate communication between BS 110a and UE 120d. A relay station may also be referred to as a relay BS, relay base station, relay, etc.

[0044] Wireless network 100 can be a heterogeneous network comprising different types of Base Stations (BSs) (e.g., macro BSs, pico BSs, femto BSs, relay BSs, etc.). These different types of BSs may have different transmit power levels, different coverage areas, and different effects on interference in wireless network 100. For example, macro BSs may have high transmit power levels (e.g., 5 to 40 watts), while pico BSs, femto BSs, and relay BSs may have lower transmit power levels (e.g., 0.1 to 2 watts).

[0045] Network controller 130 may be coupled to a group of base stations (BSs) and provide coordination and control over these BSs. Network controller 130 may communicate with each BS via backhaul. These BSs may also communicate with each other directly or indirectly, for example, via wireless or wired backhaul. In some aspects, network controller 130 may communicate with the BSs to select scheduling for multiple types of random access transmissions. For example, network controller 130 may determine that a first plurality of grid cells (e.g., frequency resources, time resources, cyclic shifts, etc.) in the network resource grid of the random access channel portion of a time slot are to be allocated for a first type of random access transmission, and a second plurality of grid cells in the network resource grid of the random access channel portion of the time slot are to be allocated for a second type of random access transmission.

[0046] UEs 120 (e.g., 120a, 120b, 120c) may be distributed throughout the wireless network 100, and each UE may be stationary or mobile. A UE may also be referred to as an access terminal, terminal, mobile station, subscriber unit, station, etc. A UE may be a cellular phone (e.g., a smartphone), a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device or equipment, a biometric sensor / device, a wearable device (smartwatch, smart clothing, smart glasses, smart wristband, smart jewelry (e.g., smart ring, smart bracelet)), an entertainment device (e.g., a music or video device, or a satellite radio), an in-vehicle component or sensor, a smart meter / sensor, industrial manufacturing equipment, a GPS device, or any other suitable device configured to communicate via wireless or wired media. Some UEs may be considered evolved or enhanced machine-type communications (eMTC) UEs. MTC and eMTC UEs include, for example, robots, drones, and remote devices such as sensors, meters, monitors, location tags, etc., which can communicate with a base station, another device (e.g., a remote device), or some other entity. Wireless nodes can provide connectivity to or to a network (e.g., a wide area network, such as the Internet or a cellular network) via wired or wireless communication links, for example. Some UEs can be considered Internet of Things (IoT) devices. Some UEs can be considered Customer Premises Equipment (CPE).

[0047] exist Figure 1 In the diagram, a solid line with a double arrow indicates a desired transmission between the UE and the serving BS, which is the BS designated to serve the UE on the downlink and / or uplink. A dashed line with a double arrow indicates a potential interference transmission between the UE and the BS.

[0048] Generally, any number of wireless networks can be deployed in a given geographical area. Each wireless network can support a specific RAT and can operate on one or more frequencies. A RAT can also be referred to as a radio technology, air interface, etc. A frequency can also be referred to as a carrier, frequency channel, etc. Each frequency can support a single RAT in a given geographical area to avoid interference between wireless networks using different RATs. In some cases, 5G RAT networks can be deployed.

[0049] In some examples, access to the air interface can be scheduled, where a scheduling entity (e.g., a base station, network controller, user equipment, etc.) allocates resources for communication among some or all of the equipment and facilities within the scheduling entity's service area or cell. Within this disclosure, as further discussed below, the scheduling entity can be responsible for scheduling, assigning, reconfiguring, and releasing resources for one or more subordinate entities. That is, for scheduled communication, the subordinate entity utilizes resources allocated by the scheduling entity. For example, the scheduling entity can schedule the allocation of network resource element grids for various types of random access transmissions. In some aspects, such scheduling information can be conveyed via signaling from the scheduling entity. For example, a UE can receive a System Information Block (SIB) message identifying a scheduling for a network resource element grid and can perform a specific type of random access transmission at a specific grid cell of the network resource based at least in part on that scheduling.

[0050] A base station is not the only entity that can be used as a scheduling entity. That is, in some examples, a UE can act as a scheduling entity to schedule resources for one or more subordinate entities (e.g., one or more other UEs). In this example, the UE is acting as the scheduling entity, and other UEs utilize the resources scheduled by the UE for wireless communication. A UE can act as a scheduling entity in a peer-to-peer (P2P) network and / or in a mesh network. In the mesh network example, UEs can optionally communicate directly with each other in addition to communicating with the scheduling entity.

[0051] Thus, in a wireless communication network with scheduled access to time-frequency resources and with cellular, P2P, and mesh configurations, a scheduling entity and one or more subordinate entities can use the scheduled resources to communicate.

[0052] As indicated above, Figure 1 This is provided merely as an example. Other examples are possible and may differ from those provided. Figure 1 The example described.

[0053] Figure 2 It shows that it can be Figure 1 Block diagram 200 shows the design of base station 110 and UE 120, one of the base stations and one of the UEs. Base station 110 may be equipped with T antennas 234a to 234t, and UE 120 may be equipped with R antennas 252a to 252r, where generally T≥1 and R≥1.

[0054] At base station 110, transmit processor 220 can receive data destined for one or more UEs from data source 212, select one or more modulation and coding schemes (MCS) for each UE based at least in part on the Channel Quality Indicator (CQI) received from each UE, process (e.g., encode and modulate) the data for each UE based at least in part on the MCS selected for each UE, and provide data symbols for all UEs. Transmit processor 220 can also process system information (e.g., semi-static resource allocation information (SRPI), etc.) and control information (e.g., CQI requests, grants, upper-layer signaling, etc.), and provide overhead symbols and control symbols. Transmit processor 220 can also generate reference symbols for reference signals (e.g., CRS) and synchronization signals (e.g., primary synchronization signal (PSS) and secondary synchronization signal (SSS)). The transmit (TX) multiple-input multiple-output (MIMO) processor 230 can perform spatial processing (e.g., precoding) on ​​data symbols, control symbols, overhead symbols, and / or reference symbols, where applicable, and can provide T output symbol streams to T modulators (MODs) 232a to 232t. Each modulator 232 can process its own output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator 232 can further process (e.g., convert to analog, amplify, filter, and up-convert) the output sample stream to obtain a downlink signal. The T downlink signals from modulators 232a to 232t can be transmitted via T antennas 234a to 234t, respectively. According to some aspects described in more detail below, position coding can be used to generate synchronization signals to convey additional information.

[0055] At UE 120, antennas 252a to 252r can receive downlink signals from base station 110 and / or other base stations and can provide the received signals to demodulators (DEMODs) 254a to 254r respectively. Each demodulator 254 can condition (e.g., filter, amplify, downconvert, and digitize) the received signal to obtain an input sample. Each demodulator 254 can further process the input sample (e.g., for OFDM, etc.) to obtain received symbols. MIMO detector 256 can obtain the received symbols from all R demodulators 254a to 254r, perform MIMO detection on these received symbols where applicable, and provide detected symbols. Receiver processor 258 can process (e.g., demodulate and decode) these detected symbols, provide the decoded data to UE 120 to data sink 260, and provide the decoded control information and system information to controller / processor 280. Channel processor can determine RSRP, RSSI, RSRQ, CQI, etc.

[0056] On the uplink, at UE 120, transmit processor 264 can receive and process data from data source 262 and control information from controller / processor 280 (e.g., reports including RSRP, RSSI, RSRQ, CQI, etc.). Transmit processor 264 can also generate reference symbols for one or more reference signals. Symbols from transmit processor 264 can be pre-encoded by TX MIMO processor 266 where applicable, further processed by modulators 254a to 254r (e.g., for DFT-s-OFDM, CP-OFDM, etc.), and transmitted to base station 110. At base station 110, uplink signals from UE 120 and other UEs can be received by antenna 234, processed by demodulator 232, detected by MIMO detector 236 where applicable, and further processed by receive processor 238 to obtain decoded data and control information transmitted by UE 120. The receiver processor 238 can provide decoded data to the data sink 239 and decoded control information to the controller / processor 240. The base station 110 may include a communication unit 244 and communicate with the network controller 130 via the communication unit 244. The network controller 130 may include a communication unit 294, a controller / processor 290, and a memory 292.

[0057] Figure 2 The controllers / processors 240 and 280 and / or any other components can respectively direct the operation at BS 110 and UE 120 to selectively utilize multiple types of random access transmissions, such as a first type of random access transmission including a preamble, a second type of random access transmission including a preamble and a random access message, and so on. For example, the controllers / processors 240 and 280 and / or other processors and modules at BS 110 or UE 120 respectively can perform or direct the operation of BS 110 or UE 120 to determine whether to use a first type of random access transmission or a second type of random access transmission, and to selectively utilize either a first type of random access transmission or a second type of random access transmission to initiate a random access procedure. Additionally or alternatively, the controllers / processors 240 and 280 and / or other processors and modules at BS 110 or UE 120 may respectively perform or direct the operation of BS 110 or UE 120 to monitor both the first type of random access transmission and the second type of random access transmission within the random access channel portion of the time slot, and receive at least one of the first type of random access transmission or the second type of random access transmission within the random access channel portion of the time slot, at least in part based on the monitoring of both the first type of random access transmission and the second type of random access transmission.

[0058] In some respects, Figure 2One or more of the components shown may be employed to perform Figure 7 Example process 700 Figure 10 Example process 1000, and / or other processes used in the techniques described herein. Memory 242 and 282 may store data and program code for use by BS 110 and UE 120, respectively. Scheduler 246 may schedule the UE for data transmission on the downlink and / or uplink.

[0059] As indicated above, Figure 2 This is provided merely as an example. Other examples are possible and may differ from those provided. Figure 2 The example described.

[0060] Figure 3A and 3B This is a diagram illustrating example 300 of various types of random access transports used in random access procedures (such as PRACH random access procedures).

[0061] like Figure 3A As shown, Type I random access transmission may include a preamble and a cyclic prefix. In some aspects, Type I random access transmission may be a PRACH random access transmission for a four-step PRACH random access procedure. The preamble may include a Random Access Channel (RACH) preamble. The preamble may be used for detection, timing estimation, etc., of the PRACH random access procedure. In some aspects, the cyclic prefix and preamble may be a single unit, which may occupy a unit in the network resource unit grid of the random access procedure portion of a time slot, as described herein.

[0062] like Figure 3B As shown, a second type of random access transmission may include a preamble set and a random access message set, each of which has a corresponding cyclic prefix. In some aspects, the second type of random access transmission may be a PRACH random access transmission for a two-step PRACH random access procedure. Each of the preamble and the random access message set may be associated with a cyclic prefix. The preamble may be used for PRACH procedure detection, timing estimation, demodulation reference signal (DMRS) for message demodulation, etc.

[0063] The second type of random access transmission may include a first cyclic prefix, a preamble, and at least one pair of second cyclic prefixes and random access messages. In some aspects, the second type of random access transmission may include multiple pairs of second cyclic prefixes and random access messages. In some aspects, the first cyclic prefix and preamble may include a first unit that may occupy a unit in a cell grid of the random access channel portion of the time slot; and each pair of second cyclic prefixes and random access messages may include a second unit that may occupy another unit in the cell grid of the random access channel portion of the time slot. In this case, each unit is associated with a corresponding resource (e.g., frequency resource, time resource, cyclic shift, etc.) of the random access channel portion of the time slot.

[0064] As indicated above, Figure 3A and 3B This is provided as an example. Other examples are possible and may differ from the reference. Figure 3A and 3B The example described.

[0065] Figure 4 This is a diagram illustrating example 400 of a cell grid in an uplink (UL) central time slot used for various types of random access transmissions.

[0066] like Figure 4 As shown, Example 400 includes a Physical Downlink Control Channel (PDCCH) portion 402 (PDCCH 402), an Uplink Long Burst (ULLB) portion 404 (ULLB 404), and an Uplink Short Burst (ULSB) portion 406 (ULSB 406).

[0067] PDCCH 402 is the downlink control section of the UL central timeslot and can be located at the beginning of the UL central timeslot and can be assigned to convey downlink control information, such as the scheduling of cell grids for various types of random access transmissions.

[0068] ULLB 404 is the uplink long burst portion of the UL-centralized timeslot and may be located between PDCCH 402 and ULSB 406 within the UL-centralized timeslot. ULLB 404 may sometimes be referred to as the payload of the UL-centralized timeslot. ULLB 404 may refer to the communication resource used to convey UL data from a lower-level entity (e.g., UE) to a scheduling entity (e.g., BS). In some respects, ULLB 404 may be used for communication on the Physical UL Shared Channel (PUSCH) and / or the Physical Uplink Control Channel (PUCCH).

[0069] ULLB 404 may include a random access channel portion 408 of a UL-centered time slot and a protection portion 410 of the UL-centered time slot. The random access channel portion 408 may include a set of network resources allocated in the UL-centered time slot for random access transmissions (such as PRACH random access transmissions). The random access channel portion 408 may include a grid of cells 412, such as cells 412-1 to 412-N (N≥1). Each cell 412 may be occupied by a portion of at least one type of random access transmission among multiple types of random access transmissions. For example, cell 412* may include a cyclic prefix (CP) 414 and a body 416. The body 416 may convey a preamble, a random access message, etc. Thus, cell 412* may convey a cyclic prefix and preamble of a first type of random access transmission, a cyclic prefix and preamble of a second type of random access transmission, a cyclic prefix and random access message of a second type of random access transmission, etc. In this way, UE 120 may transmit at least a portion of a first type of random access transmission or a second type of random access transmission in cell 412 of the network resources. In some aspects, multiple units 412 may be scheduled for a common user (i.e., a single UE 120). In some aspects, a first plurality of units 412 may be scheduled for a first user (i.e., a first UE 120), and a second plurality of units 412 may be scheduled for a second user (i.e., a second UE 120). The protection portion 410 may include a portion of network resources allocated as a time-separated segment to provide time for switching from a PRACH transmission in ULLB 404 to another transmission (e.g., PUSCH or PUCCH) in ULSB 406. In some aspects, the protection portion 410 may be referred to as a gap, a guard interval, and / or various other suitable terms.

[0070] ULSB 406 is the uplink short burst portion of a UL-centered timeslot and may be located at the end of the UL-centered timeslot. ULSB 406 may sometimes be referred to as a shared UL portion, UL burst, UL burst section, shared UL burst, short burst, UL short burst, shared UL short burst, shared UL short burst section, and / or various other suitable terms. In some respects, ULSB 406 may be used for communication on the physical UL control channel (PUCCH). Additionally or alternatively, ULSB 406 may be used for communication of uplink control information (UCI) (such as scheduling requests (SR)), HARQ information (e.g., PUCCH ACK, PUSCH ACK, PUCCH NACK, PUSCH NACK, etc.), channel quality indicators (CQI), channel status indicators (CSI), buffer status reports (BSR), probe reference signals (SRS), demodulation reference channels (DMRS), and / or various other suitable types of information.

[0071] As indicated above, Figure 4 This is provided as an example. Other examples are possible and may differ from those provided. Figure 4 The example described.

[0072] Figures 5A-5E This is a diagram illustrating example 500 of resource allocation within a cell grid in an uplink-centric timeslot for various types of random access transmissions.

[0073] like Figure 5A As shown, the resource allocation of the random access channel portion 408 of the ULLB 404 can be scheduled at least in part based on the repetition level of the random access transmission. The repetition level can refer to the number of iterations in which the same random access transmission will be transmitted.

[0074] As shown by reference numeral 502, a first portion of the random access channel portion 408 (e.g., a first group of elements 412) is reserved for Level 1 repetition for either a first type of random access transmission or a second type of random access transmission. Level 1 repetition may refer to a single iteration of the random access transmission transmitted by the UE 120. In some aspects, the UE 120 may select the number of repetitions at least partially based on a set of channel conditions. For example, based at least partially on relatively good channel conditions (such as a signal-to-noise ratio (SNR) meeting a threshold, a Doppler value meeting a threshold, etc.), the UE 120 may determine to transmit a single repetition of the random access transmission. In contrast, when channel conditions are relatively poor (such as an SNR failing to meet a threshold), the UE 120 may transmit multiple iterations of the random access transmission.

[0075] As shown by reference numeral 504, the second portion of the random access channel portion 408 (e.g., the second group of elements 412) is reserved for level 2 repetition. Level 2 repetition can refer to two iterations of the random access transmission delivered by the UE 120, thereby reducing the likelihood that the random access transmission fails to be successfully received and / or decoded by the base station 110. In some aspects, the second portion and the first portion of the random access channel portion 408 may use different time slot resources. For example, as shown, the first portion and the second portion are assigned different frequency and time resources.

[0076] As shown by reference numeral 506, the third portion of the random access channel section 408 (e.g., the third group of elements 412) is reserved for level 3 repetition. Level 3 repetition may refer to three iterations of random access transmissions by the UE 120. Additionally or alternatively, other repetition levels may be possible and may be scheduled in the same or similar portions of the random access channel section 408. In some aspects, a first repetition number may be selected for a first user of the first UE 120 and a second repetition number may be selected for a second user of the second UE 120, such as based at least in part on channel conditions, information about the first user and / or the second user, etc. In some aspects, the first repetition number may be selected at least in part based on a first set of channel conditions and the second repetition number may be selected at least in part based on a second set of channel conditions.

[0077] Figure 5A The time slot resources shown for the first group of units 412, the second group of units 412, and the third group of units 412 are provided as examples. Additional, fewer, or different resources may be used for the first group of units 412, the second group of units 412, and / or the third group of units 412.

[0078] like Figure 5B As shown, cell 508 in the cell 412 grid is reserved for first-type random access transmission with level 1 repetition. For example, cell 508 is reserved for the cyclic prefix 510 and preamble 512 for first-type random access transmission.

[0079] like Figure 5C As shown, cell 514 in the cell 412 grid is reserved for first-type random access transmission with level 2 repetition. For example, cell 514 is reserved for the cyclic prefix 516 and preamble 518 for first-type random access transmission.

[0080] As further illustrated, cell 520 in the cell 412 grid is reserved for a first type of random access transmission with level 2 repetition. For example, cell 520 is reserved for a cyclic prefix 522 and a preamble 524. The cyclic prefix 522 and preamble 524 can be repetitions of the cyclic prefix 516 and preamble 518. For example, UE 120 can receive from base station 110 a base station signaling, such as a System Information Block (SIB), indicating that cells 514 and 520 are reserved for repetitions of shared random access transmissions. This allows base station 110 to reassemble the random access transmissions of cells 514 and 520 to reduce the likelihood of failing to receive the random access transmission. In some aspects, UE 120 can frequency hop to transmit multiple repetitions of shared random access transmissions. Additionally or alternatively, different repetition levels can utilize shared time and / or frequency grids, but with different cyclic shifts of a shared root sequence. For example, units 514 and 520 can be non-overlapping in resource allocation for frequency, time, root sequence, cyclic shift, etc., and UE 120 can transmit according to the scheduled frequency, time, root sequence, cyclic shift, etc. associated with units 514 and 520. In this way, UE 120 provides improved SNR tolerance, improved Doppler tolerance, etc., compared to transmitting a single random access transmission via a single frequency.

[0081] like Figure 5D As shown, cell 526 in the cell 412 grid is reserved for a second type of random access transmission with level 1 repetition. For example, cell 526 is reserved for a cyclic prefix 528 and a preamble 530 for the second type of random access transmission.

[0082] As further shown, cell 532 in the cell 412 grid is reserved for a second type of random access transmission with level 1 repetition. For example, cell 532 is reserved for the cyclic prefix 534 and the random access message 536.

[0083] As further illustrated, cell 538 in the cell 412 grid is reserved for a second type of random access transmission with level 1 repetition. For example, cell 538 is reserved for cyclic prefix 540 and random access message 542. In this case, cells 526, 532, and 538 can be reserved for shared random access transmissions. For example, UE 120 can transmit preamble 530 for detection, timing estimation, DMRS, etc., and can transmit random access messages 536 and 542 to provide UE-ID parameters, BSR parameters, etc. In some aspects, cells 526, 532, and 538 can be reserved for transmissions corresponding to... Figure 3B The second type of random access transmission is shown in the diagram.

[0084] like Figure 5EAs shown, cell 544 in the cell 412 grid is reserved for a second type of random access transmission with level 2 repetition. For example, cell 544 is reserved for a cyclic prefix 546 and a preamble 548 for the second type of random access transmission.

[0085] As further shown, cell 550 in the cell 412 grid is reserved for a second type of random access transmission with level 2 repetition. For example, cell 550 is reserved for the cyclic prefix 552 and the random access message 554 of the second type of random access transmission.

[0086] As further illustrated, cell 556 in the cell 412 grid is reserved for a second type of random access transmission with level 2 repetition. For example, cell 556 is reserved for a cyclic prefix 558 and a preamble 560 for the second type of random access transmission. In this case, the cyclic prefix 558 and preamble 560 of cell 556 are repetitions of the cyclic prefix 546 and preamble 548 of cell 544.

[0087] As further illustrated, cell 562 in the cell 412 grid is reserved for a second type of random access transmission with level 2 repetition. For example, cell 562 is reserved for a cyclic prefix 564 and a random access message 566 for the second type of random access transmission. In this case, the cyclic prefix 564 and the random access message 566 of cell 562 are repetitions of the cyclic prefix 552 and the random access message 554 of cell 550. In some aspects, cells 544, 550, 556, and 562 may be reserved for sharing the repetition of random access transmissions. In some aspects, cells 544, 550, 556, and 562 may be reserved for... Figure 3B The second type of random access transmission is shown in the figure.

[0088] As indicated above, Figures 5A-5E This is provided as an example. Other examples are possible and may differ from the reference. Figures 5A-5E The example described.

[0089] Figures 6A-6C This is a diagram illustrating example 600 of resource allocation within a cell grid in an uplink-centric timeslot for various types of random access transmissions.

[0090] like Figure 6A As shown, the first resource allocation may include type I resource allocations 602-1 and 602-2 and type II resource allocations 604-1 and 604-2. Type I resource allocations 602-1 and 602-2 may include [missing information - likely related to resource allocation methods]. Figure 3AThe resource allocation for a first type of random access transmission is shown in the diagram (e.g., unit 412 of resources associated with one or more frequencies, times, cyclic shifts, etc.). Type II resource allocations 604-1 and 604-2 may include those for... Figure 3B The resource allocation for the second type of random access transmission is shown in the diagram. In this case, the resource allocations for the first and second types of random access transmissions are non-overlapping (i.e., non-intersecting) resource allocations. In other words, the type I resource allocations 602-1 and 602-2 are associated with frequencies, times, and / or cyclic shifts within the random access channel portion 408 of the uplink center-time slot that differ from those of the type II resource allocations 604-1 and 604-2.

[0091] like Figure 6B As shown, the second resource allocation may include type I resource allocations 606-1 and 606-2, type II resource allocation 608, and type I / type II resource allocation 610. Type I resource allocations 606-1 and 606-2 may include [missing information - likely related to resource allocation methods]. Figure 3A The resource allocation for Type I random access transmission is shown in the diagram. Type II resource allocation 608 may include resources for... Figure 3B The resource allocation for the second type of random access transmission is shown in the diagram. Type I / Type II resource allocation 610 may include shared resource allocation for units used in the first type of random access transmission and / or the second type of random access transmission. For example, the first UE 120 may use a specific root unit 412 with a first cyclic shift (e.g., sharing frequency and time resources) for the cyclic prefix and preamble of the first type of random access transmission, and the second UE 120 may use the same specific root unit 412 with a different second cyclic shift for another cyclic prefix and another preamble of the second type of random access transmission. In this scenario, the base station 110 may determine, for example, whether the preamble is associated with the first type of random access transmission or the second type of random access transmission based at least in part on the cyclic shift.

[0092] like Figure 6C As shown, the third resource allocation may include type I resource allocations 612-1 and 612-2, type I / type II resource allocation 614, and type I / type II resource allocation 616. Type I resource allocations 612-1 and 612-2 may include [missing information - likely related to resource allocation methods]. Figure 3AThe resource allocation for the first type of random access transmission is shown in the diagram. Type I / Type II resource allocation 614 may include a shared resource allocation of units for preambles of the first type of random access transmission and / or preambles of the second type of random access transmission. Type I / Type II resource allocation 616 may include a shared resource allocation of units for preambles of the first type of random access transmission and / or random access messages of the second type of random access transmission. In some aspects, Type I / Type II resource allocation 614 may be used for first type random access transmissions with a first cyclic shift and / or second type random access transmissions with a different second cyclic shift. In this case, UE 120 may use unit 412 of Type I / Type II resource allocation 616 to transmit preambles of the first type of random access transmission or use unit 412 of Type I / Type II resource allocation 616 to transmit random access messages of the second type of random access transmission, and base station 110 may detect whether UE 120 has transmitted a preamble of the first type of random access message, a preamble of the second type of random access message, or one or more random access messages from a set of random access messages.

[0093] As indicated above, Figures 6A-6C This is provided as an example. Other examples are possible and may differ from those provided. Figures 6A-6C The example described.

[0094] Figure 7 This is a flowchart of a wireless communication method 700. Method 700 can be performed by a UE (e.g., which may correspond to one or more of UE 120, equipment 800 / 800', user equipment 1150, etc.).

[0095] In 710, in some aspects, the UE receives base station signaling identifying the scheduling of resources for the random access channel portion of a time slot (box 710). For example, a first type of random access transmission may be scheduled for a first resource of the random access channel portion of the time slot, while a second type of random access transmission may be scheduled for a second resource of the random access channel portion of the time slot. In some aspects, the first resource may be separate from the second resource.

[0096] At 720, the UE determines whether to transmit at least one of a first-type random access transmission or a second-type random access transmission within the random access channel portion of the time slot (box 720). For example, the UE may determine whether to transmit at least one of a first-type random access transmission or a second-type random access transmission within the random access channel portion of the time slot. In this case, the UE may determine whether to transmit a first-type random access transmission or a second-type random access transmission based at least in part on channel conditions (such as SNR parameters, Doppler parameters, etc.). In some aspects, the first-type random access transmission includes a preamble. In some aspects, the second-type random access transmission includes a preamble and a random access message.

[0097] In some aspects, both Type I and Type II random access transmissions include a shared cell structure, where the random access channel portion of a time slot comprises a cell grid, and a preamble occupies one cell of the cell grid, and a random access message occupies one cell of the cell grid. In some aspects, Type II random access transmissions include multiple random access messages, and each of the multiple random access messages occupies a different cell in the cell grid.

[0098] In some aspects, the time slot includes a downlink control portion, an uplink long burst portion, and an uplink short burst portion, and the random access channel portion is configured within the uplink long burst portion. In some aspects, the first type of random access transmission is a first type of physical random access channel (PRACH) random access transmission, the second type of random access transmission is a second type of PRACH random access transmission, the preamble of the first type of PRACH random access transmission is the first random access channel (RACH) preamble, the preamble of the second type of PRACH random access transmission is the second RACH preamble, and the random access message is a RACH random access message.

[0099] At 730, the UE transmits at least one of a first type of random access transmission or a second type of random access transmission within the random access channel portion of the time slot (box 730). For example, the UE may transmit at least one of a first type of random access transmission or a second type of random access transmission within the random access channel portion of the time slot. In this case, the UE may transmit the first type of random access transmission or the second type of random access transmission to the base station to initiate a random access procedure, such as a Physical Random Access Channel (PRACH) random access procedure. Based at least in part on the completion of the random access procedure, the UE may be synchronized for uplink and / or downlink transmissions.

[0100] In some aspects, the first type of random access transmission and the second type of random access transmission are transmitted within the random access channel portion of a time slot. In some aspects, separate resources of the random access channel portion of the time slot are used to transmit the first type of random access transmission and the second type of random access transmission. In some aspects, scheduling for the separate resources is identified by base station signaling. In some aspects, the first type of random access transmission and the second type of random access transmission share at least one resource of the random access channel portion of the time slot. In some aspects, this at least one resource is associated with a first cyclic shift of the first type of random access transmission and a second cyclic shift of the second type of random access transmission.

[0101] In some aspects, at least one of a first type of random access transmission or a second type of random access transmission is repeatedly transmitted a number of times within the random access channel portion of a time slot. In some aspects, the number of repetitions is selected at least in part based on a set of channel conditions. In some aspects, the number of repetitions utilizes different resources within the random access channel portion of the time slot. In some aspects, the different resources include at least one of different frequencies, different times, or different cyclic shifts within the random access channel portion of the time slot. In some aspects, the scheduling of different resources for the random access channel portion of the time slot is identified by base station signaling. In some aspects, the first number of repetitions is associated with a first user, while the second number of repetitions is associated with a second user.

[0102] although Figure 7 An example box of a wireless communication method is shown, but in some aspects, the method may include more than Figure 7 The boxes shown may include more boxes, fewer boxes, different boxes, or boxes arranged differently. Additionally or alternatively, Figure 7 Two or more boxes shown can be executed in parallel.

[0103] Figure 8 This is a conceptual data flow diagram 800 illustrating the data flow between different modules / devices / components in example equipment 802. Equipment 802 may be a UE. In some aspects, equipment 802 includes a receiving module 804, a determining module 806, and / or a transmitting module 808.

[0104] The receiving module 804 can receive, as data 810, one or more signaling messages, one or more network measurements, etc., from the base station 850. The one or more signaling messages may include one or more SIBs, which may identify the resource allocation of the random access channel portion of a time slot. The one or more signaling messages may identify a portion of the resource allocation reserved for a first type of random access transmission including a preamble, a second type of random access transmission including a preamble and a random access message, and / or similar transmissions. The random access channel portion of a time slot may include a cell grid, and each cell may be allocated for a preamble for a first type of random access transmission, a preamble for a second type of random access transmission, a random access message for a second type of random access transmission, etc.

[0105] The determining module 806 can receive, as data 812, information from the receiving module 804 indicating whether to transmit at least one of a first type of random access transmission or a second type of random access transmission. For example, the determining module 806 can determine to transmit a second type of random access transmission based at least in part on network measurements indicating a threshold SNR value. Alternatively, the determining module 806 can determine to transmit a first type of random access transmission based at least in part on network measurements indicating that the SNR value does not meet the threshold. In some aspects, the determining module 806 can determine the repetition level of the random access transmission, the set of cells in a resource grid representing the set of allocable resources to be used for transmitting the random access transmission, etc.

[0106] The determination is performed at least in part by the determination module 806. The transmission module 808 may receive, as data 814, information indicating whether to transmit at least one of the first type of random access transmission or the second type of random access transmission within the random access channel portion of the time slot. The transmission module 808 may, at least in part, transmit, as data 816, the at least one of the first type of random access transmission or the second type of random access transmission to the base station 850 within the random access channel portion of the time slot based on the received data 814.

[0107] The equipment may include execution Figure 7 Each of the boxes in the aforementioned flowchart is an additional module for the algorithm. Thus, Figure 7 Each block in the aforementioned flowchart can be executed by a module, and the apparatus may include one or more of those modules. Each module may be one or more hardware components specifically configured to implement the process / algorithm, implemented by a processor configured to execute the process / algorithm, stored in a computer-readable medium for implementation by a processor, or some combination thereof.

[0108] Figure 8 The number and arrangement of modules shown are provided as an example. In practice, there may be more...Figure 8 The modules shown can have more modules, fewer modules, different modules, or different arrangements of modules. Furthermore, Figure 8 The two or more modules shown can be implemented within a single module, or Figure 8 The single module shown can be implemented as multiple distributed modules. Additionally or alternatively, Figure 8 The set of modules shown (e.g., one or more modules) can perform actions described as being performed by... Figure 9 The other set of modules shown in the diagram performs one or more functions.

[0109] Figure 9 Figure 900 illustrates an example of the hardware implementation of device 802' employing processing system 902. Device 802' may be a UE.

[0110] Processing system 902 can be implemented using a bus architecture generally represented by bus 904. Depending on the specific application and overall design constraints of processing system 902, bus 904 may include any number of interconnect buses and bridges. Bus 904 links together various circuits including one or more processors and / or hardware modules (represented by processor 906, modules 804, 806, 808, and computer-readable medium / memory 908). Bus 904 may also link various other circuits, such as timing sources, peripheral devices, voltage regulators, and power management circuits, which are well known in the art and therefore will not be described further.

[0111] Processing system 902 may be coupled to transceiver 910. Transceiver 910 is coupled to one or more antennas 912. Transceiver 910 provides means for communicating with various other equipment via a transmission medium. Transceiver 910 receives signals from one or more antennas 912, extracts information from the received signals, and provides the extracted information to processing system 902 (specifically, receiving module 804). Additionally, transceiver 910 receives information from processing system 902 (specifically, transmission module 808) and generates signals to be applied to one or more antennas 912, at least in part, based on the received information. Processing system 902 includes processor 906 coupled to computer-readable medium / memory 908. Processor 906 is responsible for general processing, including the execution of software stored on computer-readable medium / memory 908. When executed by processor 906, the software causes processing system 902 to perform the various functions described above for any particular equipment. Computer-readable medium / memory 908 may also be used to store data manipulated by processor 906 during software execution. The processing system further includes at least one of modules 804, 806, and 808. Each module may be a software module running in processor 906, a software module residing in / stored in computer-readable medium / memory 908, one or more hardware modules coupled to processor 906, or some combination thereof. Processing system 902 may be a component of UE 120 and may include memory 282 and / or at least one of the following: TX MIMO processor 266, RX processor 258, and / or controller / processor 280.

[0112] In some aspects, the apparatus 802 / 802' for wireless communication includes means for determining whether to transmit at least one of a first type of random access transmission or a second type of random access transmission within a random access channel portion of a time slot. In some aspects, the apparatus 802 / 802' for wireless communication includes means for transmitting the at least one of a first type of random access transmission or a second type of random access transmission within a random access channel portion of a time slot. The aforementioned means may be one or more modules in the processing system 902 of apparatus 802 and / or apparatus 802' configured to perform the functions described by the aforementioned means. As described above, the processing system 902 may include a TX MIMO processor 266, an RX processor 258, and / or a controller / processor 280. Thus, in one configuration, the aforementioned means may be the TX MIMO processor 266, the RX processor 258, and / or the controller / processor 280 configured to perform the functions described by the aforementioned means.

[0113] Figure 9 This is provided as an example. Other examples are possible and may differ from this combination. Figure 10The example described.

[0114] Figure 10 This is a flowchart of a wireless communication method 1000. Method 1000 can be performed by a BS (e.g., which may correspond to one or more of BS110, base station 850, equipment 1100 / 1100', etc.).

[0115] In 1010, in some aspects, the BS provides base station signaling (box 1010) identifying the scheduling of resources for the random access channel portion of a time slot. For example, a first type of random access transmission may be scheduled for a first resource of the random access channel portion of a time slot, while a second type of random access transmission may be scheduled for a second resource of the random access channel portion of that time slot. In some aspects, the first resource may be separate from the second resource.

[0116] In 1020, the BS monitors both the first type of random access transmission and the second type of random access transmission within the random access channel portion of the time slot (box 1020). For example, the BS may monitor the first type of random access transmission (which may include a preamble) and the second type of random access transmission (which may include a preamble and a random access message) so that user equipment (e.g., UE 120, equipment 800 / 800', user equipment 1150, etc.) can transmit at least one of the first type of random access transmission or the second type of random access transmission.

[0117] In some aspects, the first type of random access transmission and the second type of random access transmission each include a shared cell structure, the random access channel portion of the time slot includes a cell grid, and a preamble occupies one cell of the cell grid and a random access message occupies one cell of the cell grid. In some aspects, the second type of random access transmission includes a plurality of random access messages, and each of the plurality of random access messages occupies a different cell in the cell grid. In some aspects, the first type of random access transmission and the second type of random access transmission are received within the random access channel portion of the time slot.

[0118] In some aspects, separate resources of the random access channel portion of a time slot are used to receive first-type random access transmissions and second-type random access transmissions. In some aspects, scheduling for the separate resources is identified by base station signaling. In some aspects, the first-type random access transmission and the second-type random access transmission share at least one resource of the random access channel portion of a time slot. In some aspects, this at least one resource is associated with a first cyclic shift of the first-type random access transmission and a second cyclic shift of the second-type random access transmission.

[0119] At 1030, the BS receives at least one of the first type random access transmissions or the second type random access transmission from at least one user equipment within the random access channel portion of a time slot, based at least in part on monitoring both the first type random access transmission and the second type random access transmission (box 1030). For example, the BS may receive the first type random access transmission based at least in part on monitoring both the first type random access transmission and the second type random access transmission. Additionally or alternatively, the BS may receive the second type random access transmission based at least in part on monitoring both the first type random access transmission and the second type random access transmission.

[0120] although Figure 10 An example box of a wireless communication method is shown, but in some aspects, the method may include more than Figure 10 The boxes shown may include more boxes, fewer boxes, different boxes, or boxes arranged differently. Additionally or alternatively, Figure 11 Two or more boxes shown can be executed in parallel.

[0121] Figure 10 This is a conceptual data flow diagram 1100 illustrating the data flow between different modules / devices / components in example equipment 1102. Equipment 1102 may be a BS (Browser / Server). In some aspects, equipment 1102 includes a receiving module 1104, a monitoring module 1106, and / or a transmission module 1108.

[0122] The receiving module 1104 can receive information identifying random access transmissions from the user equipment 1150 and receive it as data 1110 and / or data 1112. For example, based at least in part on the instruction from the monitoring module 1106 to the receiving module 1104 to monitor both a first type of random access transmission and a second type of random access transmission within the random access channel portion of the time slot, the receiving module 1104 can receive at least one of the first type of random access transmission or the second type of random access transmission within the random access channel portion of the time slot.

[0123] Monitoring module 1106 can receive, as data 1114, information associated with random access transmissions from receiving module 1104. For example, monitoring module 1106 can receive an acknowledgment message from user equipment 1150 indicating confirmation of the scheduling for random access transmissions provided by transmission module 1108. In some aspects, first-type random access transmissions and second-type random access transmissions can be scheduled for separate resources of the random access channel portion of a time slot.

[0124] The transmission module 1108 may receive, as data 1116, information associated with random access transmissions from the monitoring module 1106. For example, the transmission module 1108 may receive information indicating that the receiving module 1104 has received a random access transmission, at least in part based on the monitoring module 1106 causing the receiving module 1104 to receive the random access transmission. In this case, the transmission module 1108 may provide data 1118 to the user equipment 1150 to confirm receipt of a first type of random access transmission or a second type of random access transmission. Additionally or alternatively, the transmission module 1108 may provide base station signaling with an identifier for the user equipment 1150 to use for scheduling at least one of the first type of random access transmission or the second type of random access transmission.

[0125] The equipment may include execution Figure 10 Each of the boxes in the aforementioned flowchart is an additional module for the algorithm. Thus, Figure 11 Each block in the aforementioned flowchart can be executed by a module, and the apparatus may include one or more of those modules. Each module may be one or more hardware components specifically configured to implement the process / algorithm, implemented by a processor configured to execute the process / algorithm, stored in a computer-readable medium for implementation by a processor, or some combination thereof.

[0126] Figure 11 The number and arrangement of modules shown are provided as an example. In practice, there may be more... Figure 11 The modules shown include modules with more modules, fewer modules, different modules, or modules with different arrangements. Furthermore, Figure 11 The two or more modules shown can be implemented within a single module, or Figure 11 The single module shown can be implemented as multiple distributed modules. Additionally or alternatively, Figure 11 The set of modules shown (e.g., one or more modules) can perform actions described as being performed by... Figure 12 The other set of modules shown in the diagram performs one or more functions.

[0127] Figure 12 Figure 1200 illustrates an example of the hardware implementation of device 1102' using processing system 1202. Device 1102' can be a BS.

[0128] Processing system 1202 can be implemented using a bus architecture generally represented by bus 1204. Depending on the specific application and overall design constraints of processing system 1202, bus 1204 may include any number of interconnect buses and bridges. Bus 1204 links together various circuits including one or more processors and / or hardware modules (represented by processor 1206, modules 1104, 1106, 1108, and computer-readable medium / memory 1208). Bus 1204 may also link various other circuits, such as timing sources, peripheral devices, voltage regulators, and power management circuits, which are well known in the art and therefore will not be described further.

[0129] Processing system 1202 may be coupled to transceiver 1210. Transceiver 1210 is coupled to one or more antennas 1212. Transceiver 1210 provides means for communicating with various other equipment via a transmission medium. Transceiver 1210 receives signals from one or more antennas 1212, extracts information from the received signals, and provides the extracted information to processing system 1202 (specifically, receiving module 1104). Additionally, transceiver 1210 receives information from processing system 1202 (specifically, transmission module 1108) and generates signals to be applied to one or more antennas 1212, at least in part, based on the received information. Processing system 1202 includes processor 1206 coupled to computer-readable medium / memory 1208. Processor 1206 is responsible for general processing, including the execution of software stored on computer-readable medium / memory 1208. When executed by processor 1206, this software causes processing system 1202 to perform the various functions described above for any particular equipment. The computer-readable medium / memory 1208 may also be used to store data manipulated by the processor 1206 during software execution. The processing system further includes at least one of modules 1104, 1106, and 1108. Each module may be a software module running in the processor 1206, a software module residing in / stored in the computer-readable medium / memory 1208, one or more hardware modules coupled to the processor 1206, or some combination thereof. The processing system 1202 may be a component of BS 110 and may include memory 242 and / or at least one of the following: a TX MIMO processor 230, a receive processor 238, and / or a controller / processor 240.

[0130] In some aspects, the equipment 1102 / 1102' for wireless communication includes means for monitoring both a first type of random access transmission and a second type of random access transmission within a random access channel portion of a time slot. In some aspects, the equipment 1102 / 1102' for wireless communication includes means for receiving at least one of the first type of random access transmission or the second type of random access transmission within a random access channel portion of a time slot from at least one user equipment, at least in part based on monitoring of both the first type of random access transmission and the second type of random access transmission. The aforementioned means may be one or more modules in the processing system 1202 of equipment 1102 and / or equipment 1102' configured to perform the functions described by the aforementioned means. As described above, the processing system 1202 may include a TX MIMO processor 230, an RX processor 238, and / or a controller / processor 240. Thus, in one configuration, the aforementioned means may be the TX MIMO processor 230, the RX processor 238, and / or the controller / processor 240 configured to perform the functions described by the aforementioned means.

[0131] Figure 12 This is provided as an example. Other examples are possible and may differ from this combination. ​ The example described.

[0132] It should be understood that the specific order or hierarchy of the boxes in the disclosed process / flowcharts is an explanation of the exemplary method. Based on design preferences, it should be understood that the specific order or hierarchy of the boxes in these process / flowcharts can be rearranged. Furthermore, some boxes may be combined or omitted. The appended method claims present the elements of the various boxes in an exemplary order, and are not intended to be limited to the specific order or hierarchy presented.

[0133] The preceding 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 readily 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 should be granted the full scope consistent with the language of the claims, wherein references to the singular form of an element, unless specifically stated otherwise, are not intended to mean “one and only one,” but rather “one or more.” The term “exemplary” is used herein to mean “serving as an example, instance, or illustration.” Any aspect described herein as “exemplary” is not necessarily to be construed as superior to or overriding other aspects. Unless specifically stated otherwise, the term “some” refers to one or more. Combinations such as “at least one of A, B, or C,” “at least one of A, B, and C,” and “A, B, C, or any combination thereof” include any combination of A, B, and / or C, and may include multiple A, multiple B, or multiple C. Specifically, combinations such as "at least one of A, B, or C," "at least one of A, B, and C," and "A, B, C, or any combination thereof" can be A only, B only, C only, A and B, A and C, B and C, or A and B and C, wherein any such combination may include one or more members of A, B, or C. Elements of all aspects described throughout this disclosure that are now or hereafter known to those skilled in the art are expressly incorporated herein by reference and are intended to be covered by the claims. Furthermore, nothing disclosed herein is intended to be offered to the public, whether or not such disclosure is explicitly stated in the claims. No claim element should be construed as means plus function unless that element is explicitly stated using the phrase "means for...".

Claims

1. A method for wireless communication, comprising: determining, by a user equipment, whether to transmit a first type of random access transmission for a four-step random access procedure or a second type of random access transmission for a two-step random access procedure based at least in part on whether a channel condition satisfies a threshold, wherein the first type of random access transmission for the four-step random access procedure comprises a first preamble, and wherein the second type of random access transmission for the two-step random access procedure comprises a second preamble and a random access message; and transmitting, by the user equipment, the first type of random access transmission for the four-step random access procedure or the second preamble of the second type of random access transmission for the two-step random access procedure within a random access channel portion of a slot, wherein a first resource allocation of the random access channel portion of the slot comprises a resource allocation for the first type of random access transmission for the four-step random access procedure, wherein a second resource allocation of the random access channel portion of the slot comprises a shared resource allocation for a unit of the first preamble and the second preamble, and wherein the second resource allocation of the random access channel portion of the slot comprises a shared resource allocation for a unit of the first preamble and the random access message, wherein the first preamble is different from the second preamble, and wherein the second resource allocation is different from the first resource allocation.

2. The method of claim 1, wherein, The channel condition is a measured signal parameter.

3. The method of claim 1, wherein, The first type of random access transmission for the four-step random access procedure is determined to be transmitted based at least in part on the channel condition not satisfying the threshold.

4. The method of claim 1, wherein, The second type of random access transmission for the two-step random access procedure is determined to be transmitted based at least in part on the channel condition satisfying the threshold.

5. The method of claim 1, wherein, The random access channel portion of the slot comprises a unit grid, the second preamble occupies one unit of the unit grid, and the random access message occupies one unit of the unit grid.

6. The method of claim 5, wherein, The second type of random access transmission comprises a plurality of random access messages; and wherein each of the plurality of random access messages occupies a different unit of the unit grid.

7. The method of claim 1, wherein, The first preamble and the random access message are allocated at least one shared resource of the random access channel portion of the slot.

8. The method of claim 1, wherein, The random access channel portion of the slot comprises resources allocated for physical random access channel (PRACH) transmissions.

9. An apparatus for wireless communication, comprising: a memory; and one or more processors coupled to the memory, the one or more processors configured to: determine whether to transmit a first type of random access transmission for a four-step random access procedure or a second type of random access transmission for a two-step random access procedure based at least in part on whether a channel condition satisfies a threshold, wherein the first type of random access transmission for the four-step random access procedure comprises a first preamble, and wherein the second type of random access transmission for the two-step random access procedure comprises a second preamble and a random access message; and wherein the second type random access transmission for the two-step random access procedure includes a second preamble and a random access message; and transmitting, within a random access channel portion of a slot, the first type random access transmission for the four-step random access procedure or the second preamble of the second type random access transmission for the two-step random access procedure, wherein a first resource allocation of the random access channel portion of the slot includes resource allocation for the first type random access transmission for the four-step random access procedure, wherein a second resource allocation of the random access channel portion of the slot includes shared resource allocation for units of the first preamble and the second preamble, and wherein the second resource allocation of the random access channel portion of the slot includes shared resource allocation for units of the first preamble and the random access message, wherein the first preamble is different from the second preamble, and wherein the second resource allocation is different from the first resource allocation.

10. The apparatus of claim 9, wherein, The channel condition is a measured signal parameter.

11. The apparatus of claim 9, wherein, The first type random access transmission for the four-step random access procedure is determined to be transmitted based at least in part on the channel condition not satisfying the threshold.

12. The apparatus of claim 9, wherein, The second type random access transmission for the two-step random access procedure is determined to be transmitted based at least in part on the channel condition satisfying the threshold.

13. The apparatus of claim 9, wherein, The random access channel portion of the slot includes a grid of units, the second preamble occupies one unit of the grid of units, and the random access message occupies one unit of the grid of units.

14. The apparatus of claim 13, wherein, The second type random access transmission includes a plurality of random access messages; and wherein each of the plurality of random access messages occupies a different unit of the grid of units.

15. The apparatus of claim 9, wherein, The first preamble and the random access message are allocated at least one shared resource of the random access channel portion of the slot.

16. The apparatus of claim 9, wherein, The random access channel portion of the slot includes resources allocated for physical random access channel (PRACH) transmissions.

17. An apparatus for wireless communication, comprising: means for determining whether to transmit a first type random access transmission for a four-step random access procedure or a second type random access transmission for a two-step random access procedure based at least in part on whether a channel condition satisfies a threshold, wherein the first type random access transmission for the four-step random access procedure includes a first preamble, and wherein the second type random access transmission for the two-step random access procedure includes a second preamble and a random access message; and means for transmitting, within a random access channel portion of a slot, the first type random access transmission for the four-step random access procedure or the second preamble of the second type random access transmission for the two-step random access procedure, wherein a first resource allocation of the random access channel portion of the slot includes resource allocation for the first type random access transmission for the four-step random access procedure, wherein the second resource allocation of the random access channel portion of the slot includes a shared resource allocation for units of the first preamble and the second preamble, and wherein the second resource allocation of the random access channel portion of the slot includes a shared resource allocation for units of the first preamble and the random access message, wherein the first preamble is different than the second preamble, and wherein the second resource allocation is different than the first resource allocation.

18. The apparatus of claim 17, wherein, the channel condition is a measured signal parameter.

19. The apparatus of claim 17, wherein, the first type random access transmission for the four-step random access procedure is determined to be transmitted based at least in part on the channel condition not satisfying the threshold.

20. The apparatus of claim 17, wherein, the second type random access transmission for the two-step random access procedure is determined to be transmitted based at least in part on the channel condition satisfying the threshold.

21. The apparatus of claim 17, wherein, the random access channel portion of the slot includes a unit grid, the second preamble occupies a unit in the unit grid, and the random access message occupies a unit in the unit grid.

22. The apparatus of claim 21, wherein, the second type random access transmission includes a plurality of random access messages; and wherein each of the plurality of random access messages occupies a different unit in the unit grid.

23. The apparatus of claim 17, wherein, the first preamble and the random access message are allocated at least one shared resource of the random access channel portion of the slot.

24. The apparatus of claim 17, wherein, the random access channel portion of the slot includes resources allocated for physical random access channel (PRACH) transmissions.

25. A non-transitory computer-readable medium storing instructions for wireless communication, the instructions comprising: one or more instructions that, when executed by one or more processors of a device, cause the device to: determine whether to transmit a first type random access transmission for a four-step random access procedure or a second type random access transmission for a two-step random access procedure based at least in part on whether a channel condition satisfies a threshold, wherein the first type random access transmission for the four-step random access procedure includes a first preamble, and wherein the second type random access transmission for the two-step random access procedure includes a second preamble and a random access message; and transmit the second preamble of the first type random access transmission for the four-step random access procedure or the second type random access transmission for the two-step random access procedure within a random access channel portion of a slot, wherein a first resource allocation of the random access channel portion of the slot includes a resource allocation for the first type random access transmission for the four-step random access procedure, wherein a second resource allocation of the random access channel portion of the slot includes a shared resource allocation for units of the first preamble and the second preamble, and wherein the second resource allocation of the random access channel portion of the slot includes a shared resource allocation for units of the first preamble and the random access message, wherein the first preamble is different than the second preamble, and wherein the second resource allocation is different than the first resource allocation. wherein the second resource allocation is different from the first resource allocation.

26. The non-transitory computer readable medium of claim 25, wherein, The channel condition is a measured signal parameter.

27. The non-transitory computer readable medium of claim 25, wherein, The first type random access transmission for the four-step random access procedure is determined to be transmitted based at least in part on the channel condition not satisfying the threshold.

28. The non-transitory computer readable medium of claim 25, wherein, The second type random access transmission for the two-step random access procedure is determined to be transmitted based at least in part on the channel condition satisfying the threshold.

29. The non-transitory computer readable medium of claim 25, wherein, The first preamble and the random access message are allocated at least one shared resource of the random access channel portion of the slot.

30. The non-transitory computer readable medium of claim 25, wherein, The random access channel portion of the slot includes resources allocated for physical random access channel (PRACH) transmissions.

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