Devices, methods, and medium for communication
By generating masked CRC bits based on transmission attempt characteristics for CBMsg3 messages, the solution addresses the overhead and false detection issues in NTN networks, improving communication efficiency and reliability in NB-IoT systems.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-09-26
- Publication Date
- 2026-04-02
AI Technical Summary
The challenge in non-terrestrial networks (NTN) is to reduce uplink and downlink signaling overhead for Early Data Transmission (EDT) by eliminating the need for Msg1/Random Access Response (RAR) transactions in Msg3 transmission, particularly in NB-IoT systems, while ensuring low false detection probability and efficient resource utilization.
A terminal device generates masked CRC bits based on transmission attempt characteristics and transmits a CBMsg3 message, which includes data and masked CRC bits, allowing the network device to decode the data by determining the transmission attempt characteristic implicitly from the masked CRC bits, thereby reducing overhead and false detection.
This approach reduces signaling overhead and false detection probability in NTN systems by implicitly indicating transmission attempt characteristics through masked CRC bits, enhancing communication efficiency and reliability in NB-IoT networks.
Smart Images

Figure CN2024121573_02042026_PF_FP_ABST
Abstract
Description
DEVICES, METHODS, AND MEDIUM FOR COMMUNICATIONFIELD
[0001] Example embodiments of the present disclosure generally relate to the field of communication techniques and in particular, to devices, methods, and a computer readable medium for communication.BACKGROUND
[0002] Non-terrestrial network (NTN) could provide ubiquitous and resilient wireless service beyond the terrestrial network (TN) coverage. The 3rd Generation Partnership Project (3GPP) has started the standardization of NTN since 5G, and NTN will be fully integrated with TN in 6G. In release 19 (Rel-19) new radio (NR) internet of things (IoT) -NTN phase 3, a support of Capacity enhancements for uplink is a major topic. In this topic, reducing the necessary uplink and downlink signaling to complete an Early Data Transmission (EDT) by Msg3 transmission without msg1 / Random Access Response (RAR) transaction is under discussion.SUMMARY
[0003] In general, example embodiments of the present disclosure provide devices, methods, and a computer storage medium for communication.
[0004] In a first aspect, there is provided a terminal device. The terminal device comprises at least one processor configured to cause the terminal device at least to: generate a plurality of cyclic redundancy check (CRC) bits based on data to be transmitted; determine a plurality of masked CRC bits based on the plurality of CRC bits and information associated with a transmission attempt characteristic; and transmit, to a network device, a contention based message 3 (CBMsg3) within a CBMsg3 occasion, wherein the CBMsg3 comprises at least the data and the plurality of masked CRC bits.
[0005] In a second aspect, there is provided a terminal device. The terminal device comprises at least one processor configured to cause the terminal device at least to: determine a transmission attempt number that is not larger than a maximum attempt number of a CBMsg3; determine resources for the CBMsg3 based on a resource rule and the transmission attempt number; and transmit, to a network device, the CBMsg3 within a CBMsg3 occasion on determined resources.
[0006] In a third aspect, there is provided a terminal device. The terminal device comprises at least one processor configured to cause the terminal device at least to: determine a transmission attempt number that is not larger than a maximum attempt number of a CBMsg3; and transmit, to a network device, the CBMsg3 within a CBMsg3 occasion, wherein the CBMsg3 comprises at least duplicates of data in sequential time resources or sequential frequency resources based on the transmission attempt number.
[0007] In a fourth aspect, there is provided a network device. The network device comprises at least one processor configured to cause the network device at least to: receive, from a terminal device, a CBMsg3 within a CBMsg3 occasion, wherein the CBMsg3 comprises at least data and a plurality of masked CRC bits; and decode the plurality of masked CRC bits based on information associated with a transmission attempt characteristic of the CBMsg3, to determine the data.
[0008] In a fifth aspect, there is provided a network device. The network device comprises at least one processor configured to cause the network device at least to: determine resources for a CBMsg3 based on a resource rule and a transmission attempt number that is not larger than a maximum attempt number of the CBMsg3; and receive, from a terminal device, the CBMsg3 within a CBMsg3 occasion on determined resources.
[0009] In a sixth aspect, there is provided a network device. The network device comprises at least one processor configured to cause the network device at least to: receive, from a terminal device, a CBMsg3 within a CBMsg3 occasion, wherein the CBMsg3 comprises at least duplicates of data in sequential time resources or sequential frequency resources based on the transmission attempt number; and determine the date of the CBMsg3.
[0010] In a seventh aspect, there is provided a method of communication. The method comprises: generating, at a terminal device, a plurality of CRC bits based on data to be transmitted; determining a plurality of masked CRC bits based on the plurality of CRC bits and information associated with a transmission attempt characteristic; and transmitting, to a network device, a CBMsg3 within a CBMsg3 occasion, wherein the CBMsg3 comprises at least the data and the plurality of masked CRC bits.
[0011] In an eighth aspect, there is provided a method of communication. The method comprises: determining, at a terminal device, a transmission attempt number that is not larger than a maximum attempt number of a CBMsg3; determining resources for the CBMsg3 based on a resource rule and the transmission attempt number; and transmitting, to a network device, the CBMsg3 within a CBMsg3 occasion on determined resources.
[0012] In a ninth aspect, there is provided a method of communication. The method comprises: determining, at a terminal device, a transmission attempt number that is not larger than a maximum attempt number of a CBMsg3; and transmitting, to a network device, the CBMsg3 within a CBMsg3 occasion, wherein the CBMsg3 comprises at least duplicates of data in sequential time resources or sequential frequency resources based on the transmission attempt number.
[0013] In a tenth aspect, there is provided a method of communication. The method comprises: receiving, at a network device from a terminal device, a CBMsg3 within a CBMsg3 occasion, wherein the CBMsg3 comprises at least data and a plurality of masked CRC bits; and decoding the plurality of masked CRC bits based on information associated with a transmission attempt characteristic of the CBMsg3, to determine the data.
[0014] In an eleventh aspect, there is provided a method of communication. The method comprises: determining, at a network device, resources for a CBMsg3 based on a resource rule and a transmission attempt number that is not larger than a maximum attempt number of the CBMsg3; and receiving, from a terminal device, the CBMsg3 within a CBMsg3 occasion on determined resources.
[0015] In a twelfth aspect, there is provided a method of communication. The method comprises: receiving, at a network device from a terminal device, a CBMsg3 within a CBMsg3 occasion, wherein the CBMsg3 comprises at least duplicates of data in sequential time resources or sequential frequency resources based on the transmission attempt number; and determining the date of the CBMsg3.
[0016] In a thirteenth aspect, there is provided a computer readable medium having instructions stored thereon, the instructions, when executed on at least one processor, causing the at least one processor to carry out the method according to any of the seventh to the twelfth aspects above.
[0017] It is to be understood that the summary section is not intended to identify key or essential features of embodiments of the present disclosure, nor is it intended to be used to limit the scope of the present disclosure. Other features of the present disclosure will become easily comprehensible through the following description.BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Through the more detailed description of some example embodiments of the present disclosure in the accompanying drawings, the above and other objects, features and advantages of the present disclosure will become more apparent, wherein:
[0019] FIG. 1A illustrates an example communication network in which some embodiments of the present disclosure can be implemented;
[0020] FIG. 1B illustrates an NTN typical scenario based on transparent payload;
[0021] FIG. 1C illustrates an NTN typical scenario based on regenerative payload;
[0022] FIG. 2 illustrates a signalling chart illustrating communication process in accordance with some embodiments of the present disclosure;
[0023] FIGS. 3A-3B illustrate example processes at the terminal device and at the network device respectively in accordance with some embodiments of the present disclosure;
[0024] FIG. 4 illustrates a signalling chart illustrating communication process in accordance with some embodiments of the present disclosure;
[0025] FIG. 5 illustrates a signalling chart illustrating communication process in accordance with some embodiments of the present disclosure;
[0026] FIGS. 6A-6D illustrates some examples for the multiple duplicates of data in accordance with some embodiments of the present disclosure;
[0027] FIG. 7 illustrates a flowchart of an example method implemented at a terminal device in accordance with some embodiments of the present disclosure;
[0028] FIG. 8 illustrates a flowchart of an example method implemented at a terminal device in accordance with some embodiments of the present disclosure;
[0029] FIG. 9 illustrates a flowchart of an example method implemented at a terminal device in accordance with some embodiments of the present disclosure;
[0030] FIG. 10 illustrates a flowchart of an example method implemented at a network device in accordance with some embodiments of the present disclosure;
[0031] FIG. 11 illustrates a flowchart of an example method implemented at a network device in accordance with some embodiments of the present disclosure;
[0032] FIG. 12 illustrates a flowchart of an example method implemented at a network device in accordance with some embodiments of the present disclosure; and
[0033] FIG. 13 illustrates a simplified block diagram of a device that is suitable for implementing embodiments of the present disclosure.
[0034] Throughout the drawings, the same or similar reference numerals represent the same or similar element.DETAILED DESCRIPTION
[0035] Principle of the present disclosure will now be described with reference to some example embodiments. It is to be understood that these embodiments are described only for the purpose of illustration and help those skilled in the art to understand and implement the present disclosure, without suggesting any limitation as to the scope of the disclosure. Embodiments described herein can be implemented in various manners other than the ones described below.
[0036] In the following description and claims, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skills in the art to which this disclosure belongs.
[0037] References in the present disclosure to “one embodiment, ” “an embodiment, ” “an example embodiment, ” and the like indicate that the embodiment described may include a particular feature, structure, or characteristic, but it is not necessary that every embodiment includes the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to affect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.
[0038] It shall be understood that although the terms “first” and “second” etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element could be termed a second element, and similarly, a second element could be termed a first element, without departing from the scope of example embodiments. As used herein, the term “and / or” includes any and all combinations of one or more of the listed terms.
[0039] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments. As used herein, the singular forms “a” , “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises” , “comprising” , “has” , “having” , “includes” and / or “including” , when used herein, specify the presence of stated features, elements, and / or components etc., but do not preclude the presence or addition of one or more other features, elements, components and / or combinations thereof.
[0040] In some examples, values, procedures, or apparatus are referred to as “best, ” “lowest, ” “highest, ” “minimum, ” “maximum, ” or the like. It will be appreciated that such descriptions are intended to indicate that a selection among many used functional alternatives can be made, and such selections need not be better, smaller, higher, or otherwise preferable to other selections.
[0041] As used herein, the term “communication network” refers to a network following any suitable communication standards or technologies, such as New Radio (NR) , Long Term Evolution (LTE) , LTE-Advanced (LTE-A) , Code Divided Multiple Address (CDMA) , Frequency Divided Multiple Address (FDMA) , Time Divided Multiple Address (TDMA) , Frequency Divided Duplexer (FDD) , Time Divided Duplexer (TDD) , Multiple-Input Multiple-Output (MIMO) , Orthogonal Frequency Divided Multiple Access (OFDMA) , cdma2000, Wideband Code Division Multiple Access (WCDMA) , High-Speed Packet Access (HSPA) , Global System for Mobile Communications (GSM) , Narrow Band Internet of Things (NB-IoT) and so on. Furthermore, the communications between a terminal device and a network device in the communication network may be performed according to any suitable generation communication protocols, including, but not limited to, the first generation (1G) , the second generation (2G) , 2.5G, 2.75G, the third generation (3G) , the fourth generation (4G) , 4.5G, the fifth generation (5G) , 5.5G, 5G-Advanced networks, beyond 5G (B5G) , the sixth generation (6G) communication protocols, wireless local network communication protocols such as Institute for Electrical and Electronics Engineers (IEEE) 802.11 and the like, and / or any other protocols either currently known or to be developed in the future. The techniques described herein may be used for the wireless networks and radio technologies mentioned above as well as other wireless networks and radio technologies. Embodiments of the present disclosure may be applied in various communication systems. Given the rapid development in communications, there will of course also be future type communication technologies and systems with which the present disclosure may be embodied. It should not be seen as limiting the scope of the present disclosure to only the aforementioned system.
[0042] As used herein, the term “terminal device” refers to any device having wireless or wired communication capabilities. Examples of terminal device include, but not limited to, user equipment (UE) , personal computers, desktops, mobile phones, cellular phones, smart phones, personal digital assistants (PDAs) , portable computers, tablets, wearable devices, internet of things (IoT) devices, Ultra-reliable and Low Latency Communications (URLLC) devices, Internet of Everything (IoE) devices, machine type communication (MTC) devices, device on vehicle for V2X communication where X means pedestrian, vehicle, or infrastructure / network, devices for Integrated Access and Backhaul (IAB) , Space borne vehicles or Air borne vehicles in Non-terrestrial networks (NTN) including Satellites and High Altitude Platforms (HAPs) encompassing Unmanned Aircraft Systems (UAS) , eXtended Reality (XR) devices including different types of realities such as Augmented Reality (AR) , Mixed Reality and Virtual Reality (VR) , the unmanned aerial vehicle (UAV) commonly known as a drone which is an aircraft without any human pilot, devices on high speed train (HST) , or image capture devices such as digital cameras, sensors, gaming devices, music storage and playback appliances, or Internet appliances enabling wireless or wired Internet access and browsing and the like. The ‘terminal device’ can further has ‘multicast / broadcast’ feature, to support public safety and mission critical, V2X applications, transparent IPv4 / IPv6 multicast delivery, IPTV, smart TV, radio services, software delivery over wireless, group communications and IoT applications. It may also be incorporated one or multiple Subscriber Identity Module (SIM) as known as Multi-SIM. The term “terminal device” can be used interchangeably with a UE, a mobile station, a subscriber station, a mobile terminal, a user terminal or a wireless device.
[0043] As used herein, the term “network device” refers to a device which is capable of providing or hosting a cell or coverage where terminal devices can communicate. Examples of a network device include, but not limited to, a satellite, an unmanned aerial systems (UAS) platform, a Node B (NodeB or NB) , an evolved NodeB (eNodeB or eNB) , a next generation NodeB (gNB) , a transmission reception point (TRP) , a remote radio unit (RRU) , a radio head (RH) , a remote radio head (RRH) , an IAB node, a low power node such as a femto node, a pico node, a reconfigurable intelligent surface (RIS) , and the like.
[0044] In one embodiment, the terminal device may be connected with a first network device and a second network device. One of the first network device and the second network device may be a master node (MN) and the other one may be a secondary node (SN) . The first network device and the second network device may use different radio access technologies (RATs) . In one embodiment, the first network device may be a first RAT device and the second network device may be a second RAT device. In one embodiment, the first RAT device is eNB and the second RAT device is gNB. Information related with different RATs may be transmitted to the terminal device from at least one of the first network device and the second network device. In one embodiment, first information may be transmitted to the terminal device from the first network device and second information may be transmitted to the terminal device from the second network device directly or via the first network device. In one embodiment, information related with configuration for the terminal device configured by the second network device may be transmitted from the second network device via the first network device. Information related with reconfiguration for the terminal device configured by the second network device may be transmitted to the terminal device from the second network device directly or via the first network device.
[0045] The terminal device or the network device may have Artificial intelligence (AI) or machine learning capability. It generally includes a model which has been trained from numerous collected data for a specific function, and can be used to predict some information.
[0046] The terminal device or the network device may work on several frequency ranges, e.g. frequency range 1 (FR1) (410 MHz –7125 MHz) , frequency range 2 (FR2) (24.25GHz to 71GHz) , frequency band larger than 100GHz as well as Tera Hertz (THz) . It can further work on licensed / unlicensed / shared spectrum. The terminal device may have more than one connection with the network device under Multi-Radio Dual Connectivity (MR-DC) application scenario. The terminal device or the network device can work on full duplex, flexible duplex and cross division duplex modes.
[0047] The embodiments of the present disclosure may be performed in test equipment, e.g., signal generator, signal analyzer, spectrum analyzer, network analyzer, test terminal device, test network device, or channel emulator.
[0048] The embodiments of the present disclosure may be performed according to any generation communication protocols either currently known or to be developed in the future. Examples of the communication protocols include, but not limited to, the 1G, 2G, 2.5G, 2.75G, 3G, 4G, 4.5G, 5G, 5.5G, 5G-Advanced networks, or 6G networks.
[0049] The term “circuitry” used herein may refer to hardware circuits and / or combinations of hardware circuits and software. For example, the circuitry may be a combination of analog and / or digital hardware circuits with software / firmware. As a further example, the circuitry may be any portions of hardware processors with software including digital signal processor (s) , software, and memory (ies) that work together to cause an apparatus, such as a terminal device or a network device, to perform various functions. In a still further example, the circuitry may be hardware circuits and or processors, such as a microprocessor or a portion of a microprocessor, that requires software / firmware for operation, but the software may not be present when it is not needed for operation. As used herein, the term circuitry also covers an implementation of merely a hardware circuit or processor (s) or a portion of a hardware circuit or processor (s) and its (or their) accompanying software and / or firmware.
[0050] As used herein, the singular forms “a” , “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. The term “includes” and its variants are to be read as open terms that mean “includes, but is not limited to. ” The term “based on” is to be read as “based at least in part on. ” The term “one embodiment” and “an embodiment” are to be read as “at least one embodiment. ” The term “another embodiment” is to be read as “at least one other embodiment. ” The terms “first, ” “second, ” and the like may refer to different or same objects. Other definitions, explicit and implicit, may be included below.
[0051] In some examples, values, procedures, or apparatus are referred to as “best, ” “lowest, ” “highest, ” “minimum, ” “maximum, ” or the like. It will be appreciated that such descriptions are intended to indicate that a selection among many used functional alternatives can be made, and such selections need not be better, smaller, higher, or otherwise preferable to other selections.
[0052] NB-IoT (Narrowband Internet of Things) represents a novel cellular technology, introduced by 3GPP (Third Generation Partnership Program) in LTE Release 13. The definition of NB-IoT encompasses a variety of key characteristics, including superb coverage, a large number of connections, low power consumption, and low cost. These characteristics render NB-IoT an optimal choice for application scenarios that necessitate extensive coverage and a substantial number of device connections, including smart water metering, smart electricity metering, and environmental monitoring. From a technical specification standpoint, NB-IoT is founded upon E-UTRAN (Evolved Universal Terrestrial Radio Access Network) and is compatible with a half-duplex operational mode. Furthermore, NB-IoT incorporates low-power "sleep" modes (PSM, eDRX) , which streamline terminal design and reduce communication quality requirements. Subsequent releases of 3GPP have further enhanced the capabilities of NB-IoT. As an illustration, in Release 14, the user experience was augmented with the introduction of features such as enhanced positioning accuracy and elevated peak data rates. Furthermore, in Releases 16 and 17, several additional features were introduced to enhance the performance and efficiency of NB-IoT. These include the enhancement of Early Data Transmission (EDT) for mobile terminals, UE group wake-up signals (GWUS) , and Preconfigured Uplink Resource (PUR) transmission. In Release 17, the technology was further extended through the combination with non-terrestrial networks (NTNs) , thereby enhancing its coverage.
[0053] EDT represents a mechanism that facilitates data transmission during random access, thereby enabling the optimization of the transmission of small packets and a notable extension of the battery life of the device. In the context of NB-IoT, the SystemInformationBlockType2-NB comprises a series of parameters, including the edt-Parameters, which are of paramount importance for EDT support. Furthermore, the SystemInformationBlock contains additional configuration data pertinent to NB-IoT, including the NPRACH-ConfigSIB-NB field.
[0054] The Msg3 message for NB-IoT is the third step in the random access process and is used for the UE to send a response to the base station. For example, some terms may be related:
[0055] - Repetition number: the Msg3 message contains a 3-bit repetition number field (repetition number) to indicate the number of repetitions of the message.
[0056] - MCS index: this field contains 3 bits to indicate the TBS (Transmission Block Size) , the modulation method and the number of Resource Units (RUs) used by Msg3.
[0057] - Subcarrier Range: in the NB-IoT system, Msg3 is transmitted using a specific subcarrier range, which is defined by nprach-SubcarrierMSG3-RangeStart and nprach-NumCBRA.
[0058] It is agreed that details of a contention based massage 3 (CBMsg3 or CMsg3) are to be studied. For example, a CBMsg3 early data transmission (EDT) -like mechanism may be used. However, an issue about an indication of replica and overhead should be further studied.
[0059] Embodiments of the present disclosure provide a solution of communication. In the solution, a terminal device may determine a plurality of masked CRC bits based on a plurality of CRC bits and information associated with a transmission attempt characteristic; and further transmit the CBMsg3 within a CBMsg3 occasion and comprises at least the data and the plurality of masked CRC bits. As such, the transmission attempt characteristic can be implicitly indicated by the CRC bits, as such the false detection probability of the CBMsg3 transmission attempt characteristic in the header can be lower, and the overhead can be reduced. Principles and implementations of the present disclosure will be described in detail below with reference to the figures.
[0060] FIG. 1A illustrates an example communication network 100 in which some embodiments of the present disclosure can be implemented. The communication network 100 may also be called as a network environment, a network system, a communication system, a communication environment, or the like, the present disclosure does not limit this aspect. The communication network 100 includes a network device 110 and a terminal device 120 which may communicate with each other. The communication network 100 may also include a core network (CN) which is not illustrated in FIG. 1A, and the CN may involve a variety of network functions or entities.
[0061] In the communication network 100, the network device 110 and the terminal device 120 can communicate data and control information to each other, and the communications in the communication network may be implemented according to any proper communication protocol (s) .
[0062] Embodiments of the present disclosure can be applied to any suitable scenarios. For example, embodiments of the present disclosure can be implemented at reduced capability NR devices. Alternatively, embodiments of the present disclosure can be implemented in one of the followings: NR multiple-input and multiple-output (MIMO) , NR sidelink enhancements, NR systems with frequency above 52.6GHz, an extending NR operation up to 71GHz, narrow band-Internet of Thing (NB-IOT) / enhanced Machine Type Communication (eMTC) over non-terrestrial networks (NTN) , terrestrial networks (TN) , UE power saving enhancements, NR coverage enhancement, NB-IoT and LTE-MTC, Integrated Access and Backhaul (IAB) , NR Multicast and Broadcast Services, or enhancements on Multi-Radio Dual-Connectivity.
[0063] It is to be understood that the numbers of devices and their connection relationships and types shown in FIG. 1A are only for the purpose of illustration without suggesting any limitation. For example, there may be multiple terminal devices connecting to the network device 110, for example the network 100 may include any suitable numbers of devices adapted for implementing embodiments of the present disclosure.
[0064] The network device 110 may be implemented as an on-board network device, such as a gNB deployed at a satellite. In some implementations, the network 100 may be implemented as an NTN, which refers to a network or segment of networks using RF resources on board a satellite or a UAS platform. A satellite (or UAS platform) may implement either a transparent or a regenerative (with on board processing) payload. The satellite (or UAS platform) generate beams typically over a given service area bounded by its field of view. The footprints of the beams are typically of elliptic shape. The field of view of a satellite (or UAS platform) depends on the on board antenna diagram and min elevation angle.
[0065] FIG. 1B illustrates an NTN typical scenario based on transparent payload. A transparent payload may refer to Radio Frequency filtering, Frequency conversion and amplification. Hence, the waveform signal repeated by the payload is un-changed.
[0066] FIG. 1C illustrates an NTN typical scenario based on regenerative payload. A regenerative payload may refer to Radio Frequency filtering, Frequency conversion and amplification as well as demodulation / decoding, switch and / or routing, coding / modulation. This is effectively equivalent to having all or part of base station functions (e.g. gNB, eNB) on board the satellite (or UAS platform) .
[0067] Table 1 below describes some parameters for some kinds of satellite.
[0068] Table 1
[0069] Reference is now made to FIG. 2, which illustrates a signalling chart illustrating communication process 200 in accordance with some example embodiments of the present disclosure. The process 200 may involve a network device 110 and a terminal device 120 as shown in FIG. 1A. It would be appreciated that the process 200 may be applied to other communication scenarios, which will not be described in detail.
[0070] In process 200, the terminal device 120 generates a plurality of CRC bits based on data to be transmitted at 210. In some examples, the data to be transmitted includes a header and a payload. In some other example, the data to be transmitted includes a payload but does not include the header.
[0071] In some examples, a number of the plurality of CRC bits may be predefined or preconfigured. For example, N CRC bits may be generated. In some examples, a CRC encoder may be used for generating the plurality of CRC bits, which may also be referred to as N legacy CRC bits.
[0072] In the process 200, the terminal device 120 determine a plurality of masked CRC bits based on the plurality of CRC bits and information associated with a transmission attempt characteristic at 220. In some implementations, the transmission attempt characteristic may include one or multiple of the following: a UE ID, a group ID, a cell ID, a transmission attempt number, etc.
[0073] In some examples, a plurality of masked CRC bits may be N masked CRC bits, which may also be referred to as a plurality of transformed CRC bits. In some examples, a CRC transformer may be used for determining the plurality of masked CRC bits. In some examples, the CRC transformer may be function of the plurality of CRC bits (i.e., legacy CRC bits) and information associated with a transmission attempt characteristic. For example, the plurality of transformed CRC bits may be determined based on the following: Transformed CRC bits = CRC transformer (legacy CRC bits, transmission attempt characteristic) .
[0074] In some implementations, the terminal device 120 determines a transmission attempt number for CBMsg3. For example, multiple attempts may be determined. In some embodiments, the transmission attempt number may be represented as Na, that is, Na attempts for CBMsg3, where Na is a positive integer. For instance, Na = 4, or Na=3, or another value. In some examples, the transmission attempt number is not larger than a maximum attempt number of a CBMsg3. The maximum attempt number of the CBMsg3 may be configured by the network device 110 explicitly or implicitly. In some instances, the network device 110 may transmit a signal including the maximum attempt number to the terminal device 120, that is, the maximum attempt number is indicated explicitly. In some instances, the network device 110 may transmit a resource configuration of a CBMsg3 occasion to the terminal device 120, and accordingly the terminal device 120 may determine the maximum attempt number based on the resource configuration of the CBMsg3 occasion, that is, the maximum attempt number is indicated implicitly.
[0075] In some implementations, the information associated with the transmission attempt characteristic comprises at least one of: the transmission attempt number which is not larger than a maximum attempt number of the CBMsg3, a time position for each attempt of multiple attempts with the transmission attempt number, a frequency position for each attempt of multiple attempts with the transmission attempt number, or a position-changing pattern for multiple attempts with the transmission attempt number.
[0076] In some example embodiments, the terminal device 120 may determine multiple bits, a value of which may indicate the transmission attempt number. For example, the multiple bits may be a multiple-bit sequence.
[0077] In some examples, the terminal device 120 may mask multiple most significant bits (MSBs) or multiple least significant bits (LSBs) in the plurality of CRC bits with the multiple bits. For example, the maximum attempt number is 4, and 2 bits may be needed. For example, if the transmission attempt number is 3 (which is smaller than the maximum attempt number 4) , and the multiple bits may be “10” representing the transmission attempt number. In addition, 2 MSBs or 2 LSBs of the plurality of CRC bits may be masked by “10” respectively. For example, a masking operation may be performed by an XOR (i.e. exclusive OR) operator.
[0078] In some examples, the plurality of CRC bits may be divided into multiple sets, and the multiple sets may be masked by the multiple bits respectively. For example, the multiple sets may be multiple sectors of bits. For example, the maximum attempt number is 8, and 3 bits may be needed, in this case, the plurality of CRC bits may be divided into 3 sets. For example, if there are 24 CRC bits, then each set may include 8 CRC bits after dividing. For example, if the transmission attempt number is 6 (which is smaller than the maximum attempt number 8) , and the multiple bits may be “101” representing the transmission attempt number. In addition, each set may be masked by a corresponding bit in “101” . For example, a masking operation may be performed by an XOR (i.e. exclusive OR) operator.
[0079] In some example embodiments, the terminal device 120 may determine multiple bits, a number of the multiple bits may equal to the maximum attempt number of a CBMsg3. Each bit may indicate whether a corresponding attempt is made. For example, a bit with a value 1 may indicate a corresponding attempt is made, or with a value 0 may indicate a corresponding attempt is not made. For example, for a first attempt, if a corresponding bit is with a value 1, it means there is the first attempt. For example, for a second attempt, if a corresponding bit is with a value 0, it means there is not the second attempt.
[0080] In some examples, the terminal device 120 may mask multiple MSBs or multiple LSBs in the plurality of CRC bits with the multiple bits. For example, the maximum attempt number is 4, and 4 bits may be needed. For example, 4 bits may be determined corresponding to attempts. In addition, 4 MSBs or 4 LSBs of the plurality of CRC bits may be masked by the 4 bits respectively. For example, a masking operation may be performed by an XOR (i.e. exclusive OR) operator.
[0081] In some examples, the plurality of CRC bits may be divided into multiple sets, and the multiple sets may be masked by the multiple bits respectively. For example, the multiple sets may be multiple sectors of bits. For example, the maximum attempt number is 8, and 8 bits may be needed, in this case, the plurality of CRC bits may be divided into 8 sets. For example, if there are 16 CRC bits, then each set may include 2 CRC bits after dividing. For example, the k-th set may be masked by the k-th bit in the 8 bits, where k may be in a range from 1 to 8 (or from 0 to 7) . For example, a masking operation may be performed by an XOR (i.e. exclusive OR) operator.
[0082] In some example embodiments, the terminal device 120 may determine multiple bits, where the multiple bits may include multiple groups of bits, and a number of the multiple groups may equal to the maximum attempt number of a CBMsg3. Each of the multiple groups may include one or more bits, and a number of the one or more bits may be determined based on a total number of subcarriers. Each of the multiple groups may indicate a frequency position of a corresponding position. For example, if the total number of subcarriers is 48 (i.e., the maximum subcarrier number is 48) , then each group includes 6 bits; in other words, there are 6 bits for indicating a frequency position for a corresponding attempt. For example, if the maximum attempt number is 3, then the multiple bits may be 6*3=18 bits.
[0083] In some examples, the terminal device 120 may mask multiple MSBs or multiple LSBs in the plurality of CRC bits with the multiple bits. For example, 18 bits including 3 groups may be determined if the total number of subcarriers is 48 and the maximum attempt number is 3. In addition, 18 MSBs or 18 LSBs of the plurality of CRC bits may be masked by the 18 bits respectively. For example, a masking operation may be performed by an XOR (i.e. exclusive OR) operator.
[0084] In some examples, the plurality of CRC bits may be divided into multiple sets. For example, if the maximum attempt number is 4 and there are 24 CRC bits, then 4 sets may be determined and each set includes 6 CRC bits. For example, each set may be masked by a bit sequence associated with a frequency position of a corresponding attempt. For example, the bit sequence may be determined based on a subcarrier index multiplexing a value (such as k, which may be one of 1, 2, 3, 4, 5, 6, 7, 8, 9) if a corresponding attempt is made. For example, a masking operation may be performed by an XOR (i.e. exclusive OR) operator.
[0085] In some example embodiments, the terminal device 120 may determine multiple bits, a value of which may indicate a position-changing pattern for the multiple attempts. For example, the multiple bits may be a multiple-bit sequence. In some examples, a position-changing pattern may be a frequency hopping rule for NPRACH, a frequency difference of two adjacent attempts, a frequency difference associated with time positions of attempts.
[0086] In some examples, a plurality of patterns may be predefined or preconfigured, for example, multiple bits may be used for indicating an index of a position-changing pattern in the plurality of patterns. For example, if a maximum index of the pattern is 8, then 3 bits may be used for indicating an index of a pattern. For example, if a maximum index of the pattern is 16, then 4 bits may be used for indicating an index of a pattern. In some examples, the terminal device 120 may determine a position-changing pattern with an index which is represented by multiple bits.
[0087] In some examples, the terminal device 120 may mask multiple MSBs or multiple LSBs in the plurality of CRC bits with the multiple bits. For example, 3 bits may be used for indicating an index of a position-changing pattern. In addition, 3 MSBs or 3 LSBs of the plurality of CRC bits may be masked by the 3 bits respectively. For example, a masking operation may be performed by an XOR (i.e. exclusive OR) operator.
[0088] In some examples, the plurality of CRC bits may be divided into multiple sets, and the multiple sets may be masked by the multiple bits respectively. For example, 4 bits may be used for indicating an index of a position-changing pattern, in this case, the plurality of CRC bits may be divided into 4 sets. For example, if there are 24 CRC bits, then each set may include 6 CRC bits after dividing. For example, if the 4 bits are “0101” for representing an index 6, then each set may be masked by a corresponding bit in “0101” . For example, a masking operation may be performed by an XOR (i.e. exclusive OR) operator.
[0089] In the process 200, the terminal device 120 transmits the CBMsg3 which includes the data and the plurality of masked CRC bits to the network device 110 at 230. In some implementations, the terminal device 120 may append the plurality of masked CRC bits with the data.
[0090] In the process 200, the network device 110 determines the data and the transmission attempt characteristic at 240. After receiving the CBMsg3, the network device 110 may decode the plurality of masked CRC bits based on information associated with a transmission attempt characteristic of the CBMsg3, to determine the data.
[0091] In some example embodiments, the network device 110 may determine legacy CRC bits from the plurality of masked CRC bits by using a possible transmission attempt characteristic, and then check the legacy CRC bits based on the data. In some examples, a CRC retransformer may be used by the network device 110, for example, the network device 110 may try a possible transmission attempt characteristic as one input of the CRC retransformer, so as to determine temporary legacy CRC bits based on the plurality of masked CRC bits. For example, the temporary legacy CRC bits may be determined based on the following:
[0092] Temporary legacy CRC bits = CRC retransformer (aplurality of masked CRC bits, a possible transmission attempt characteristic) .
[0093] In addition, the network device 110 may check the data with the temporary legacy CRC bits. For example, if the CRC check is passed, it means the temporary legacy CRC bits are right, accordingly the used transmission attempt characteristic is correct and the received data is correct. For example, if the CRC check is failed, it means the temporary legacy CRC bits are not right, in addition, the network device 110 may use another possible transmission attempt characteristic to determine different temporary legacy CRC bits for CRC checking. For example, if all possible transmission attempt characteristic have been used, and the CRC check is still not passed, then it is determined that the data is received with an error.
[0094] FIG. 3A illustrates an example process 310 at the terminal device. As illustrated, legacy CRC bits may be generated based on data bits using a CRC encoder, transformed CRC bits may be generated based on the legacy CRC bits using a CRC transformer, in addition, the transmitted CRC bits may be appended with data, and the CBMsg3 will be transmitted.
[0095] FIG. 3B illustrates an example process 320 at the network device. As illustrated, the network device may try to retransform the received CRC bits to determine legacy CRC bits, and further check the data with the retransformed CRC bits. Accordingly, the network device determines data and transmission attempt characteristic if the CRC check is passed.
[0096] According embodiments with reference to FIGS. 2-3B, the transmission attempt characteristic can be implicitly indicated by the CRC bits, as such the false detection probability of the CBMsg3 transmission attempt characteristic in the header can be lower, and the overhead can be reduced.
[0097] It should be noted that embodiments with reference to FIGS. 2-3B are only for illustration without any limitation. In some implementations, a Radio Network Temporary Identifier (RNTI) may be further used while generating the plurality of CRC bits generated at 210 or while determining the plurality of masked CRC bits at 220. In some examples, the RNTI may be determined based on the transmission attempt characteristic, and optionally further based on an identity and / or an orthogonal cover code (OCC) index, e.g., RNTI=RNTI function (identity, transmission attempt characteristic) or RNTI=RNTI function (identity, OCC index, transmission attempt characteristic) . For example, in case an OCC length is 4, the OCC index may be represented by one of 00, 01, 10, or 11. As such, part or all of the RNTI may be determined based on the transmission attempt characteristic. For instance, the identity may be any of: a UE ID, a UE group ID, a cell ID, an identity configured by network, etc.
[0098] In some examples, the plurality of CRC bits (e.g., updated legacy CRC bits) may be generated based on the data and the RNTI. For example, the updated legacy CRC bits may be determined based on an XOR operation of legacy CRC bits and the RNTI.
[0099] In some examples, the plurality of masked CRC bits (the transformed CRC bits) may be generated based on the transmission attempt characteristic and the RNTI (optionally and the OCC index) . For example, the plurality of transformed CRC bits may be determined based on one of the following:
[0100] Transformed CRC bits = CRC transformer (legacy CRC bits, transmission attempt characteristic, RNTI) ,
[0101] Transformed CRC bits = CRC transformer (legacy CRC bits, transmission attempt characteristic, OCC index) ,
[0102] Transformed CRC bits = CRC transformer (updated legacy CRC bits, transmission attempt characteristic) ,
[0103] Transformed CRC bits = RNTI function (CRC transformer (legacy CRC bits, transmission attempt characteristic) , identity) ,
[0104] Transformed CRC bits = RNTI function (CRC transformer (legacy CRC bits, transmission attempt characteristic) , OCC index) , or
[0105] Transformed CRC bits = RNTI function (CRC transformer (legacy CRC bits, transmission attempt characteristic) , identity, OCC index) .
[0106] For example, there may be N legacy CRC bits, and the first N1 legacy CRC bits may be masked by a first bit sequence associated with the transmission attempt characteristic, the following N2 legacy CRC bits may be masked by a second bit sequence associated with the identity, and the further following N3 legacy CRC bits may be masked by a third bit sequence associated with the OCC index. It should be noted that the order for masking may be modified and some other examples may be obtained accordingly.
[0107] For example, there may be N legacy CRC bits, which may be divided into N1 sets, and the N1 sets may be masked by the N1 bits of the first bit sequence respectively to obtain a first processed CRC bits. The first processed CRC bits may be divided into N2 sets, and the N2 sets may be masked by the N2 bits of the second bit sequence respectively to obtain a second processed CRC bits. The second processed CRC bits may be divided into N3 sets, and the N3 sets may be masked by the N3 bits of the third bit sequence respectively to obtain a third processed CRC bits, which may be taken as the transformed CRC bits. It should be noted that the order for masking may be modified and some other examples may be obtained accordingly.
[0108] As a specific example, the entire payload is used to calculate the CRC parity bits. Denote the bits of the payload (including the user data and potential header part) by a0, a1, a2, a3, . . ., aA-1 , and the parity bits by p0, p1, p2, p3, . . ., pL-1 . A is the payload size and L is the number of parity bits.
[0109] The parity bits are computed and attached by setting L to 16 bits, resulting in the sequence b0, b1, b2, …, bB-1, where B = A+ L.
[0110] In the case where neither closed-loop UE transmit antenna selection nor CBMsg3 nor OCC is not configured or applicable, after attachment, the CRC parity bits are scrambled with the corresponding RNTI xrnti, 0, xrnti, 1, …, xrnti, 15, where xrnti, 0 corresponds to the MSB of the RNTI, to form the sequence of bits c0, c1, c2, …, cB-1. The relation between ck and bk is:
[0111] ck=bk, for k = 0, 1, 2, …, A-1;
[0112] ck= (bk+xrnti, k-A) mode 2, for k = A, A+1, A+2, . .., A+15.
[0113] In the case where CBMsg3 is configured and applicable, after attachment, the CRC parity bits with are scrambled with the CBMsg3 transmission attempt characteristic mask xCBMsg3, 0, xCBMsg3, 1, …xCBMsg3, 15 and the corresponding RNTI xrnti, 0, xrnti, 1, …, xrnti, 15 to form the sequence of bits c0, c1, c2, …, cB-1. The relation between ck and bk is:
[0114] ck=bk, for k = 0, 1, 2, …, A-1;
[0115] ck= (bk+xrnti, k-A+xCBMsg3, k-A) mode 2, for k = A, A+1, A+2, . .., A+15.
[0116] Further, in the case where OCC is configured and applicable, after attachment, the CRC parity bits with are scrambled with the OCC characteristic mask xOCC, 0, xOCC, 1, …xOCC, 15 and the corresponding RNTI xrnti, 0, xrnti, 1, …, xrnti, 15 to form the sequence of bits d0, d1, d2, …, dB-1. The relation between dk and bk is:
[0117] dk=bk, for k = 0, 1, 2, …, A-1;
[0118] dk= (bk+xrnti, k-A+xOCC, k-A) mode 2, for k = A, A+1, A+2, . .., A+15.
[0119] Further, in the case where both OCC and CBMsg3 are configured and applicable, after attachment, the CRC parity bits with are scrambled with the CBMsg3 transmission attempt characteristic mask xCBMsg3, 0, xCBMsg3, 1, …xCBMsg3, 15, the OCC characteristic mask xOCC, 0, xOCC, 1, …xOCC, 15 and the corresponding RNTI xrnti, 0, xrnti, 1, …, xrnti, 15 to form the sequence of bits e0, e1, e2, …, eB-1. The relation between ek and bk is:
[0120] ek=bk, for k = 0, 1, 2, …, A-1;
[0121] ek= (bk+xrnti, k-A+xCBMsg3, k-A+xOCC, k-A) mode 2, for k = A, A+1, A+2, ..., A+15.
[0122] It should be understood that some other examples are also applied which will be listed herein for brevity. As such, it can assist the network in verifying the correctness of decoding, reduce the probability of conflict, and improve the network performance.
[0123] Reference is further made to FIG. 4, which illustrates a signalling chart illustrating communication process 400 in accordance with some example embodiments of the present disclosure. The process 400 may involve a network device 110 and a terminal device 120 as shown in FIG. 1A. It would be appreciated that the process 400 may be applied to other communication scenarios, which will not be described in detail.
[0124] In the process 400, the terminal device 120 determines a transmission attempt number for CBMsg3 at 410. For example, multiple attempts may be determined. In some embodiments, the transmission attempt number may be represented as Na, that is, Na attempts for CBMsg3, where Na is a positive integer. For instance, Na = 4, or Na=3, or another value. In some examples, the transmission attempt number is not larger than a maximum attempt number of a CBMsg3.
[0125] In the process 400, the terminal device 120 determines resources for a transmission of the CBMsg3 at 420. In some embodiments, the terminal device 120 may determine a resource for each attempt among the Na attempts.
[0126] In some implementations, a resource rule may be predefined or be preconfigured by the network device 110. In some examples, the network device 110 may transmit a message which indicates the resource rule. For example, the message may be any of downlink control information (DCI) , a MAC CE, or RRC signalling.
[0127] In some examples, multiple resource rules may be defined or preconfigured (e.g., through RRC signalling) , and the network device 110 may transmit an indication of one of the multiple resource rules to the terminal device 120. For example, the indication may be carried in a DCI, a MAC CE, or another RRC signalling. For example, different resource rules may have different rule indexes or different IDs, and the indication may include an index or an ID of the resource rule.
[0128] In some examples, the indication of a specific resource rule (such as rule 1) may indicate to the terminal device 120 to activate the specific resource rule (such as rule 1) . In some examples, there is at most one resource rule is activated, the network device 110 may transmit another indication of another resource rule (such as rule 2) to the terminal device 120. Accordingly, the terminal device 120 may deactivate the rule 1 and activate rule 2. As such, the resource rule can be updated based on an updated indication from the network device 110. Therefore, the network device 110 may decide which resource rule is used, e.g., based on the resource utilization state, and thus the transmission for CBMsg3 can be controlled and optimized by the network device 110, so as to optimize the system throughput.
[0129] In some example embodiments, according to the resource rule, the terminal device 120 may determine a specific subcarrier for multiple attempts, and may determine a time position randomly selected for each attempt. In some examples, there may be a plurality of subcarriers within a CBMsg3 occasion, and one of the plurality of subcarriers may be selected for the CBMsg3 transmission, that is, each attempt may occupy the same subcarrier. In some examples, time positions for different attempts may be related with each other or may be independent from each other.
[0130] In some examples, the specific subcarrier may be determined based on a specific ID, such as a UE ID of the terminal device 120, a network configured ID, a network configured group ID, etc. For example, the network configured ID may be one of: a cell RNTI, a CBMsg3-RNTI, an EDT-RNTI, a PUR-RNTI, etc.
[0131] In some example embodiments, according to the resource rule, the terminal device 120 may determine a subcarrier randomly selected for each attempt, and may determine multiple time positions for multiple attempts respectively. In some examples, multiple time positions for multiple attempts may be continuous in time domain, for example, the multiple time positions include the first X time positions, e.g., X=Na. In some examples, the selected subcarriers for different attempts may be the same or different.
[0132] In some example embodiments, according to the resource rule, the terminal device 120 may determine a specific subcarrier for multiple attempts, and may determine multiple time positions for multiple attempts respectively. In some examples, a same subcarrier may be selected for each attempt, and X consecutive time positions (such as the first X time positions) may be selected for multiple attempts respectively. As such, the detection complexity at the network device 110 can be reduced, thereby improving a reliability of detection.
[0133] In some example embodiments, according to the resource rule, the terminal device 120 may determine a time-frequency resource for each attempt with a frequency hopping pattern. In some examples, the resource rule may indicate a frequency hopping pattern. In some examples, the terminal device 120 may determine a resource for the first hop, and further determines resources for other hops based on the frequency hopping pattern. For example, the resource for the first hop may include a specific subcarrier, which may be determined based on a specific ID, such as a UE ID of the terminal device 120, a network configured ID, a network configured group ID, etc.
[0134] On the other side of communication, the network device 110 can determine the resources for multiple attempts at 425 in a similar way as the operation at 420.
[0135] In the process 400, the terminal device 120 transmits the CBMsg3 within a CBMsg3 occasion at the determined resources at 430.
[0136] In some examples, the network device 110 may perform a sequential cancellation based on the resource rule after successfully detecting one of the CBMsg3 attempts from the terminal device 120.
[0137] According to embodiments with reference to FIG. 4, the freedom for selecting resources of each CBMsg3 transmission can be constrained in the time and / or frequency distribution based on a resource rule. As such, the overhead for CBMsg3 transmission can be reduced, for example, the overhead of the header package can be reduced. The network device can simplify the detection complexity, that is, the complexity at the network side can be lower. In addition, since the resources are determined based on the resource rule, a false detection probability can be smaller, and the processing latency at the network side can be lower.
[0138] Reference is further made to FIG. 5, which illustrates a signalling chart illustrating communication process 500 in accordance with some example embodiments of the present disclosure. The process 500 may involve a network device 110 and a terminal device 120 as shown in FIG. 1A. It would be appreciated that the process 500 may be applied to other communication scenarios, which will not be described in detail.
[0139] In the process 500, the terminal device 120 determines a transmission attempt number for CBMsg3 at 510. For example, multiple attempts may be determined. In some embodiments, the transmission attempt number may be represented as Na, that is, Na attempts for CBMsg3, where Na is a positive integer. For instance, Na = 4, or Na=3, or another value. In some examples, the transmission attempt number is not larger than a maximum attempt number of a CBMsg3.
[0140] In the process 500, the terminal device 120 transmits a CBMsg3 including multiple duplicates of data in sequential time resources or sequential frequency resources at 520.
[0141] In some example embodiments, a repetition number may be configured, for example, the number of multiple duplicates may equal to the repetition number, which may be represented as Nr. For example, a configuration including the repetition number may be transmitted from the network device 110 to the terminal device 120, that is, the repetition number may be indicated explicitly. For example, the network device 110 may transmit information of an OCC length to the terminal device 120, and accordingly the terminal device 120 may determine the repetition number based on the OCC length, that is, the repetition number may be indicated implicitly. For instance, an OCC length may be a length of an OCC codeword or an OCC sequence. For instance, the repetition number may equal to the OCC length, or may be determined based on a function of the OCC length. As such, the network capacity for the CBMsg3 transmission can be increased in case the OCC is enabled at the network side, and in addition the overhead may be reduced for an implicit indication of the repetition number.
[0142] In some examples, the multiple duplicates of data may correspond to multiple repetitions respectively, and the multiple duplicates of data may be transmitted in one attempt.
[0143] In some embodiments, the resource for one attempt may be configured based on the repetition number. In some examples, there are more resources for one attempt with repetition than that without the repetition. In some examples, more resources may be configured by the network device 110 for a CBMsg3 occasion with a larger repetition number than that with a smaller repetition number.
[0144] In some examples, the data may include a header and a payload. In some examples, the data may include a payload, but not including a header.
[0145] In some examples, the multiple duplicates of data may be generated by repeating the data for multiple times, e.g., in adjacent multiple time resources or frequency resources.
[0146] FIGS. 6A-6D illustrates some examples for the multiple duplicates of data with a repetition number being 3 (i.e., 3 repetitions) . In FIG. 6A, each duplicate of data includes a header and a payload, and different duplicates have different time resources (e.g., adjacent temporal resources) and a same frequency resource. In FIG. 6B, each duplicate of data includes a header and a payload, and different duplicates have different frequency resources (e.g., adjacent frequency resources) and a same time resource.
[0147] In FIG. 6C and FIG. 6D, each duplicate of data includes a payload and multiple duplicates share a same header. In some examples, the header and the payloads may be coded with independent CRCs or with a shared CRC. In some examples, the resource for the header may be configured independently from the resource for the payloads.
[0148] For example, the resource for the attempt in FIGS. 6A-6B, 6D may be 3 times of a resource for an attempt without a repetition. For example, the resource for the attempt in FIG. 6C may be less than 3 times of a resource for an attempt without repetition. As such, the resource overhead can be reduced, the system resource utilization can be enhanced, thereby boosting the overall performance of the network.
[0149] As such, the coverage-enhanced CBMsg3 transmission attempt may be transmitted in the CBMsg3 transmission occasion.
[0150] According to embodiments with reference to FIGS. 5-6D, multiple duplicates of data may be transmitted within one CBMsg3 occasion, thus the CBMsg3 coverage performance can be enhanced, and the overhead for a header that indicates CBMsg3 attempts positions can be reduced.
[0151] It is to be appreciated that the processes described above are only for illustration without any limitation. In some examples, one or more steps may be omitted or combined or modified. In some examples, one or more additional steps may be added. One or more steps in a process may be combined into another process. It is to be understood that some further embodiments may be obtained and are still in the protection scope of the present disclosure.
[0152] FIG. 7 illustrates a flowchart of an example method 700 implemented at a terminal device in accordance with some embodiments of the present disclosure. For the purpose of discussion, the terminal device which may perform the method 700 can be the terminal device 120 discussed above.
[0153] At block 710, the terminal device 120 generates a plurality of CRC bits based on data to be transmitted. At block 720, the terminal device 120 determines a plurality of masked CRC bits based on the plurality of CRC bits and information associated with a transmission attempt characteristic. At block 730, the terminal device 120 transmits, to a network device, a CBMsg3 within a CBMsg3 occasion, wherein the CBMsg3 comprises at least the data and the plurality of masked CRC bits.
[0154] It should be noted that the method 700 may include various other operations which may be performed by the terminal device 120 as described above with reference to FIGS. 2-3B.
[0155] FIG. 8 illustrates a flowchart of an example method 800 implemented at a terminal device in accordance with some embodiments of the present disclosure. For the purpose of discussion, the terminal device which may perform the method 800 can be the terminal device 120 mentioned above.
[0156] At block 810, the terminal device 120 determines a transmission attempt number that is not larger than a maximum attempt number of a CBMsg3. At block 820, the terminal device 120 determines resources for the CBMsg3 based on a resource rule and the transmission attempt number. At block 830, the terminal device 120 transmits, to a network device, the CBMsg3 within a CBMsg3 occasion on determined resources.
[0157] It should be noted that the method 800 may include various other operations which may be performed by the terminal device 120 as described above with reference to FIG. 4.
[0158] FIG. 9 illustrates a flowchart of an example method 900 implemented at a terminal device in accordance with some embodiments of the present disclosure. For the purpose of discussion, the terminal device which may perform the method 900 can be the terminal device 120 mentioned above.
[0159] At block 910, the terminal device 120 determines a transmission attempt number that is not larger than a maximum attempt number of a CBMsg3. At block 920, the terminal device 120 transmits, to a network device, the CBMsg3 within a CBMsg3 occasion, wherein the CBMsg3 comprises at least duplicates of data in sequential time resources or sequential frequency resources based on the transmission attempt number.
[0160] It should be noted that the method 900 may include various other operations which may be performed by the terminal device 120 as described above with reference to FIGS. 5-6D.
[0161] FIG. 10 illustrates a flowchart of an example method 1000 implemented at a network device in accordance with some embodiments of the present disclosure. For the purpose of discussion, the network device which may perform the method 1000 can be the network device 110 discussed above.
[0162] At block 1010, the network device 110 receives, from a terminal device, a CBMsg3 within a CBMsg3 occasion, wherein the CBMsg3 comprises at least data and a plurality of masked CRC bits. At block 1020, the network device 110 decodes the plurality of masked CRC bits based on information associated with a transmission attempt characteristic of the CBMsg3, to determine the data.
[0163] It should be noted that the method 1000 may include various other operations which may be performed by the network device 110 as described above with reference to FIGS. 2-3B.
[0164] FIG. 11 illustrates a flowchart of an example method 1100 implemented at a network device in accordance with some embodiments of the present disclosure. For the purpose of discussion, the network device which may perform the method 1100 can be the network device 110 discussed above.
[0165] At block 1110, the network device 110 determines resources for a CBMsg3 based on a resource rule and a transmission attempt number that is not larger than a maximum attempt number of the CBMsg3. At block 1120, the network device 110 receives, from a terminal device, the CBMsg3 within a CBMsg3 occasion on determined resources.
[0166] It should be noted that the method 1100 may include various other operations which may be performed by the network device 110 as described above with reference to FIG. 4.
[0167] FIG. 12 illustrates a flowchart of an example method 1200 implemented at a network device in accordance with some embodiments of the present disclosure. For the purpose of discussion, the network device which may perform the method 1200 can be the network device 110 discussed above.
[0168] At block 1210, the network device 110 receives, from a terminal device, a CBMsg3 within a CBMsg3 occasion, wherein the CBMsg3 comprises at least duplicates of data in sequential time resources or sequential frequency resources based on the transmission attempt number. At block 1220, the network device 110 determines the date of the CBMsg3.
[0169] It should be noted that the method 1200 may include various other operations which may be performed by the network device 110 as described above with reference to FIGS. 5-6D.
[0170] Details of some embodiments according to the present disclosure have been described with reference to FIGS. 1A-12. Now an example implementation of the terminal device and the network device will be discussed below.
[0171] In some example embodiments, a terminal device comprises circuitry configured to: generate a plurality of CRC bits based on data to be transmitted; determine a plurality of masked CRC bits based on the plurality of CRC bits and information associated with a transmission attempt characteristic; and transmit, to a network device, a CBMsg3 within a CBMsg3 occasion, wherein the CBMsg3 comprises at least the data and the plurality of masked CRC bits. It should be noted that the terminal device comprises circuitry configured to perform various other operations as described above with reference to FIGS. 2-3B.
[0172] In some example embodiments, a terminal device comprises circuitry configured to: determine a transmission attempt number that is not larger than a maximum attempt number of a CBMsg3; determine resources for the CBMsg3 based on a resource rule and the transmission attempt number; and transmit, to a network device, the CBMsg3 within a CBMsg3 occasion on determined resources. It should be noted that the terminal device comprises circuitry configured to perform various other operations as described above with reference to FIG. 4.
[0173] In some example embodiments, a terminal device comprises circuitry configured to: determine a transmission attempt number that is not larger than a maximum attempt number of a CBMsg3; and transmit, to a network device, the CBMsg3 within a CBMsg3 occasion, wherein the CBMsg3 comprises at least duplicates of data in sequential time resources or sequential frequency resources based on the transmission attempt number. It should be noted that the terminal device comprises circuitry configured to perform various other operations as described above with reference to FIGS. 5-6D.
[0174] In some example embodiments, a network device comprises circuitry configured to: receive, from a terminal device, a CBMsg3 within a CBMsg3 occasion, wherein the CBMsg3 comprises at least data and a plurality of masked CRC bits; and decode the plurality of masked CRC bits based on information associated with a transmission attempt characteristic of the CBMsg3, to determine the data. It should be noted that the network device comprises circuitry configured to perform various other operations as described above with reference to FIGS. 2-3B.
[0175] In some example embodiments, a network device comprises circuitry configured to: determine resources for a CBMsg3 based on a resource rule and a transmission attempt number that is not larger than a maximum attempt number of the CBMsg3; and receive, from a terminal device, the CBMsg3 within a CBMsg3 occasion on determined resources. It should be noted that the network device comprises circuitry configured to perform various other operations as described above with reference to FIG. 4.
[0176] In some example embodiments, a network device comprises circuitry configured to: receive, from a terminal device, a CBMsg3 within a CBMsg3 occasion, wherein the CBMsg3 comprises at least duplicates of data in sequential time resources or sequential frequency resources based on the transmission attempt number; and determine the date of the CBMsg3. It should be noted that the network device comprises circuitry configured to perform various other operations as described above with reference to FIGS. 5-6D.
[0177] FIG. 13 illustrates a simplified block diagram of a device 1300 that is suitable for implementing embodiments of the present disclosure. The device 1300 can be considered as a further example implementation of the terminal device 120 and the network device 110 as described above. Accordingly, the device 1300 can be implemented at or as at least a part of the terminal device or the network device.
[0178] As shown, the device 1300 includes a processor 1310, a memory 1320 coupled to the processor 1310, a suitable transceiver 1340 coupled to the processor 1310, and a communication interface coupled to the transceiver 1340. The memory 1320 stores at least a part of a program 1330. The transceiver 1340 may be for bidirectional communications or a unidirectional communication based on requirements. The transceiver 1340 may include at least one of a transmitter and a receiver. The transmitter and the receiver may be functional modules or physical entities. The transceiver 1340 has at least one antenna to facilitate communication, though in practice an Access Node mentioned in this application may have several ones. The communication interface may represent any interface that is necessary for communication with other network elements, such as X2 / Xn interface for bidirectional communications between eNBs / gNBs, S1 / NG interface for communication between a Mobility Management Entity (MME) / Access and Mobility Management Function (AMF) / SGW / UPF and the eNB / gNB, Un interface for communication between the eNB / gNB and a relay node (RN) , or Uu interface for communication between the eNB / gNB and a terminal device.
[0179] The program 1330 is assumed to include program instructions that, when executed by the associated processor 1310, enable the device 1300 to operate in accordance with the embodiments of the present disclosure, as discussed herein with reference to FIGS. 1A-12. The embodiments herein may be implemented by computer software executable by the processor 1310 of the device 1300, or by hardware, or by a combination of software and hardware. The processor 1310 may be configured to implement various embodiments of the present disclosure. Furthermore, a combination of the processor 1310 and memory 1320 may form processing means 1350 adapted to implement various embodiments of the present disclosure.
[0180] The memory 1320 may be of any type suitable to the local technical network and may be implemented using any suitable data storage technology, such as a non-transitory computer readable storage medium, semiconductor-based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory, as non-limiting examples. While only one memory 1320 is shown in the device 1300, there may be several physically distinct memory modules in the device 1300. The processor 1310 may be of any type suitable to the local technical network, and may include one or more of general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on multicore processor architecture, as non-limiting examples. The device 1300 may have multiple processors, such as an application specific integrated circuit chip that is slaved in time to a clock which synchronizes the main processor.
[0181] In summary, embodiments of the present disclosure may provide the following solutions.
[0182] The present disclosure provides a terminal device, comprising at least one processor configured to cause the terminal device at least to: generate a plurality of CRC bits based on data to be transmitted; determine a plurality of masked CRC bits based on the plurality of CRC bits and information associated with a transmission attempt characteristic; and transmit, to a network device, a CBMsg3 within a CBMsg3 occasion, wherein the CBMsg3 comprises at least the data and the plurality of masked CRC bits.
[0183] In one embodiment, the terminal device as above, the information associated with the transmission attempt characteristic comprises at least one of: a transmission attempt number which is not larger than a maximum attempt number of the CBMsg3, a time position for each attempt of multiple attempts with the transmission attempt number, a frequency position for each attempt of multiple attempts with the transmission attempt number, or a position-changing pattern for multiple attempts with the transmission attempt number.
[0184] In one embodiment, the terminal device as above, at least one processor is configured to cause the terminal device to generate the plurality of masked CRC bits by: masking multiple MSBs or multiple LSBs in the plurality of CRC bits with multiple bits respectively, wherein, a value of the multiple bits indicates the transmission attempt number, each of the multiple bits indicates whether a corresponding attempt is made, the multiple bits comprise multiple groups corresponding to the maximum attempt number of the CBMsg3, each group indicates a frequency position for a corresponding attempt, or a value of the multiple bits indicates a position-changing pattern for the multiple attempts.
[0185] In one embodiment, the terminal device as above, at least one processor is configured to cause the terminal device to generate the plurality of masked CRC bits by: dividing the plurality of CRC bits into multiple sets of bits; and masking the multiple sets of bits with multiple bits respectively, wherein, a value of the multiple bits indicates the transmission attempt number, each of the multiple bits indicates whether a corresponding attempt is made, the multiple bits comprise multiple groups corresponding to the maximum attempt number of the CBMsg3, each group indicates a frequency position for a corresponding attempt, or a value of the multiple bits indicates a position-changing pattern for the multiple attempts.
[0186] The present disclosure provides a terminal device, comprising at least one processor configured to cause the terminal device at least to: determine a transmission attempt number that is not larger than a maximum attempt number of a CBMsg3; determine resources for the CBMsg3 based on a resource rule and the transmission attempt number; and transmit, to a network device, the CBMsg3 within a CBMsg3 occasion on determined resources.
[0187] In one embodiment, the terminal device as above, the resources comprise: a same subcarrier among a plurality of predetermined subcarriers for a plurality of attempts of the CBMsg3, or a subcarrier randomly selected for each attempt in the plurality of attempts.
[0188] In one embodiment, the terminal device as above, the resources comprise: a plurality of time positions corresponding to a plurality of attempts of the CBMsg3, or a time position randomly selected for each attempt in the plurality of attempts.
[0189] In one embodiment, the terminal device as above, the resources comprise a plurality of subcarriers in a frequency hopping pattern corresponding to a plurality of attempts of the CBMsg3.
[0190] In one embodiment, the terminal device as above, the at least one processor is configured to cause the terminal device to: receive, from the network device, an indication of the resource rule, wherein a plurality of rules are predefined or preconfigured and the resource rule is one of the plurality of rules.
[0191] The present disclosure provides a terminal device, comprising at least one processor configured to cause the terminal device at least to: determine a transmission attempt number that is not larger than a maximum attempt number of a CBMsg3; and transmit, to a network device, the CBMsg3 within a CBMsg3 occasion, wherein the CBMsg3 comprises at least duplicates of data in sequential time resources or sequential frequency resources based on the transmission attempt number.
[0192] In one embodiment, the terminal device as above, each of the duplicates of data comprises a header and a payload.
[0193] In one embodiment, the terminal device as above, each of the duplicates of data comprises a payload, and the CBMsg3 further comprises a header.
[0194] The present disclosure provides a network device, comprising at least one processor configured to cause the network device at least to: receive, from a terminal device, a CBMsg3 within a CBMsg3 occasion, wherein the CBMsg3 comprises at least data and a plurality of masked CRC bits; and decode the plurality of masked CRC bits based on information associated with a transmission attempt characteristic of the CBMsg3, to determine the data.
[0195] In one embodiment, the network device as above, the information associated with the transmission attempt characteristic comprises at least one of: a transmission attempt number which is not larger than a maximum attempt number of the CBMsg3, a time position for each attempt of multiple attempts with the transmission attempt number, a frequency position for each attempt of multiple attempts with the transmission attempt number, or a position-changing pattern for multiple attempts with the transmission attempt number.
[0196] In one embodiment, the network device as above, at least one processor is configured to cause the network device to: demask multiple MSBs or multiple LSBs in the plurality of masked CRC bits with multiple bits respectively, wherein, a value of the multiple bits indicates the transmission attempt number, each of the multiple bits indicates whether a corresponding attempt is made, the multiple bits comprise multiple groups corresponding to the maximum attempt number of the CBMsg3, each group indicates a frequency position for a corresponding attempt, or a value of the multiple bits indicates a position-changing pattern for the multiple attempts.
[0197] In one embodiment, the network device as above, at least one processor is configured to cause the network device to: divide the plurality of masked CRC bits into multiple sets of masked bits; and demask the multiple sets of masked bits with multiple bits respectively, wherein, a value of the multiple bits indicates the transmission attempt number, each of the multiple bits indicates whether a corresponding attempt is made, the multiple bits comprise multiple groups corresponding to the maximum attempt number of the CBMsg3, each group indicates a frequency position for a corresponding attempt, or a value of the multiple bits indicates a position-changing pattern for the multiple attempts.
[0198] The present disclosure provides a network device, comprising at least one processor configured to cause the network device at least to: determine resources for a CBMsg3 based on a resource rule and a transmission attempt number that is not larger than a maximum attempt number of the CBMsg3; and receive, from a terminal device, the CBMsg3 within a CBMsg3 occasion on determined resources.
[0199] In one embodiment, the network device as above, the resources comprise: a same subcarrier among a plurality of predetermined subcarriers for a plurality of attempts of the CBMsg3, or a subcarrier randomly selected for each attempt in the plurality of attempts.
[0200] In one embodiment, the network device as above, the resources comprise: a plurality of time positions corresponding to a plurality of attempts of the CBMsg3, or a time position randomly selected for each attempt in the plurality of attempts.
[0201] In one embodiment, the network device as above, the resources comprise a plurality of subcarriers in a frequency hopping pattern corresponding to a plurality of attempts of the CBMsg3.
[0202] In one embodiment, the network device as above, the at least one processor is configured to cause the network device to: transmit, to the terminal receive, an indication of the resource rule, wherein a plurality of rules are predefined or preconfigured and the resource rule is one of the plurality of rules.
[0203] The present disclosure provides a network device, comprising at least one processor configured to cause the network device at least to: receive, from a terminal device, a CBMsg3 within a CBMsg3 occasion, wherein the CBMsg3 comprises at least duplicates of data in sequential time resources or sequential frequency resources based on the transmission attempt number; and determine the date of the CBMsg3.
[0204] In one embodiment, the network device as above, each of the duplicates of data comprises a payload, and the CBMsg3 further comprises a header.
[0205] The present disclosure provides a method of communication, comprising the operations implemented at the terminal device or at a network device discussed above.
[0206] The present disclosure provides a terminal device, comprising: a processor; and a memory storing computer program codes; the memory and the computer program codes configured to, with the processor, cause the terminal device to perform the method implemented at the terminal device discussed above.
[0207] The present disclosure provides a network device, comprising: a processor; and a memory storing computer program codes; the memory and the computer program codes configured to, with the processor, cause the network device to perform the method implemented at the network device discussed above.
[0208] The present disclosure provides a non-transitory computer readable medium having instructions stored thereon, the instructions, when executed by a processor of an apparatus, causing the apparatus to perform the method implemented at a terminal device or at a network device discussed above.
[0209] Generally, various embodiments of the present disclosure may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. Some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device. While various aspects of embodiments of the present disclosure are illustrated and described as block diagrams, flowcharts, or using some other pictorial representation, it will be appreciated that the blocks, apparatus, systems, techniques or methods described herein may be implemented in, as non-limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.
[0210] The present disclosure also provides at least one computer program product tangibly stored on a non-transitory computer readable storage medium. The computer program product includes computer-executable instructions, such as those included in program modules, being executed in a device on a target real or virtual processor, to carry out the process or method as described above. Generally, program modules include routines, programs, libraries, objects, classes, components, data structures, or the like that perform particular tasks or implement particular abstract data types. The functionality of the program modules may be combined or split between program modules as desired in various embodiments. Machine-executable instructions for program modules may be executed within a local or distributed device. In a distributed device, program modules may be located in both local and remote storage media.
[0211] Program code for carrying out methods of the present disclosure may be written in any combination of one or more programming languages. These program codes may be provided to a processor or controller of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the program codes, when executed by the processor or controller, cause the functions / operations specified in the flowcharts and / or block diagrams to be implemented. The program code may execute entirely on a machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.
[0212] The above program code may be embodied on a machine readable medium, which may be any tangible medium that may contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. The machine readable medium may be a machine readable signal medium or a machine readable storage medium. A machine readable medium may include but not limited to an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of the machine readable storage medium would include an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM) , a read-only memory (ROM) , an erasable programmable read-only memory (EPROM or Flash memory) , an optical fiber, a portable compact disc read-only memory (CD-ROM) , an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
[0213] Further, while operations are depicted in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all illustrated operations be performed, to achieve desirable results. In certain circumstances, multitasking and parallel processing may be advantageous. Likewise, while several specific implementation details are contained in the above discussions, these should not be construed as limitations on the scope of the present disclosure, but rather as descriptions of features that may be specific to particular embodiments. Certain features that are described in the context of separate embodiments may also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment may also be implemented in multiple embodiments separately or in any suitable sub-combination.
[0214] Although the present disclosure has been described in language specific to structural features and / or methodological acts, it is to be understood that the present disclosure defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.
Claims
1.A terminal device comprising at least one processor configured to cause the terminal device to:generate a plurality of cyclic redundancy check (CRC) bits based on data to be transmitted;determine a plurality of masked CRC bits based on the plurality of CRC bits and information associated with a transmission attempt characteristic; andtransmit, to a network device, a contention based message 3 (CBMsg3) within a CBMsg3 occasion, wherein the CBMsg3 comprises at least the data and the plurality of masked CRC bits.2.The terminal device of claim 1, wherein the information associated with the transmission attempt characteristic comprises at least one of:a transmission attempt number which is not larger than a maximum attempt number of the CBMsg3,a time position for each attempt of multiple attempts with the transmission attempt number,a frequency position for each attempt of multiple attempts with the transmission attempt number, ora position-changing pattern for multiple attempts with the transmission attempt number.3.The terminal device of claim 2, wherein at least one processor is configured to cause the terminal device to generate the plurality of masked CRC bits by:masking multiple most significant bits (MSBs) or multiple least significant bits (LSBs) in the plurality of CRC bits with multiple bits respectively, wherein,a value of the multiple bits indicates the transmission attempt number,each of the multiple bits indicates whether a corresponding attempt is made,the multiple bits comprise multiple groups corresponding to the maximum attempt number of the CBMsg3, each group indicates a frequency position for a corresponding attempt, ora value of the multiple bits indicates a position-changing pattern for the multiple attempts.4.The terminal device of claim 2, wherein at least one processor is configured to cause the terminal device to generate the plurality of masked CRC bits by:dividing the plurality of CRC bits into multiple sets of bits; andmasking the multiple sets of bits with multiple bits respectively, wherein,a value of the multiple bits indicates the transmission attempt number,each of the multiple bits indicates whether a corresponding attempt is made,the multiple bits comprise multiple groups corresponding to the maximum attempt number of the CBMsg3, each group indicates a frequency position for a corresponding attempt, ora value of the multiple bits indicates a position-changing pattern for the multiple attempts.5.A terminal device comprising at least one processor configured to cause the terminal device to:determine a transmission attempt number that is not larger than a maximum attempt number of a contention based message 3 (CBMsg3) ;determine resources for the CBMsg3 based on a resource rule and the transmission attempt number; andtransmit, to a network device, the CBMsg3 within a CBMsg3 occasion on determined resources.6.The terminal device of claim 5, wherein the resources comprise:a same subcarrier among a plurality of predetermined subcarriers for a plurality of attempts of the CBMsg3, ora subcarrier randomly selected for each attempt in the plurality of attempts.7.The terminal device of claim 5, wherein the resources comprise:a plurality of time positions corresponding to a plurality of attempts of the CBMsg3, ora time position randomly selected for each attempt in the plurality of attempts.8.The terminal device of claim 5, wherein the resources comprise a plurality of subcarriers in a frequency hopping pattern corresponding to a plurality of attempts of the CBMsg3.9.The terminal device of claim 5, wherein the at least one processor is configured to cause the terminal device to:receive, from the network device, an indication of the resource rule, wherein a plurality of rules are predefined or preconfigured and the resource rule is one of the plurality of rules.10.A terminal device comprising at least one processor configured to cause the terminal device to:determine a transmission attempt number that is not larger than a maximum attempt number of a contention based message 3 (CBMsg3) ; andtransmit, to a network device, the CBMsg3 within a CBMsg3 occasion, wherein the CBMsg3 comprises at least duplicates of data in sequential time resources or sequential frequency resources based on the transmission attempt number.11.The terminal device of claim 10, wherein each of the duplicates of data comprises a header and a payload.12.The terminal device of claim 10, wherein each of the duplicates of data comprises a payload, and the CBMsg3 further comprises a header.13.A network device comprising at least one processor configured to cause the network device to:receive, from a terminal device, a contention based message 3 (CBMsg3) within a CBMsg3 occasion, wherein the CBMsg3 comprises at least data and a plurality of masked CRC bits; anddecode the plurality of masked CRC bits based on information associated with a transmission attempt characteristic of the CBMsg3, to determine the data.14.The network device of claim 13, wherein the information associated with the transmission attempt characteristic comprises at least one of:a transmission attempt number which is not larger than a maximum attempt number of the CBMsg3,a time position for each attempt of multiple attempts with the transmission attempt number,a frequency position for each attempt of multiple attempts with the transmission attempt number, ora position-changing pattern for multiple attempts with the transmission attempt number.15.The network device of claim 13, wherein at least one processor is configured to cause the network device to:demask multiple most significant bits (MSBs) or multiple least significant bits (LSBs) in the plurality of masked CRC bits with multiple bits respectively, wherein,a value of the multiple bits indicates the transmission attempt number,each of the multiple bits indicates whether a corresponding attempt is made,the multiple bits comprise multiple groups corresponding to the maximum attempt number of the CBMsg3, each group indicates a frequency position for a corresponding attempt, ora value of the multiple bits indicates a position-changing pattern for the multiple attempts.16.The network device of claim 13, wherein at least one processor is configured to cause the network device to:divide the plurality of masked CRC bits into multiple sets of masked bits; anddemask the multiple sets of masked bits with multiple bits respectively, wherein,a value of the multiple bits indicates the transmission attempt number,each of the multiple bits indicates whether a corresponding attempt is made,the multiple bits comprise multiple groups corresponding to the maximum attempt number of the CBMsg3, each group indicates a frequency position for a corresponding attempt, ora value of the multiple bits indicates a position-changing pattern for the multiple attempts.17.A network device comprising at least one processor configured to cause the network device to:determine resources for a contention based message 3 (CBMsg3) based on a resource rule and a transmission attempt number that is not larger than a maximum attempt number of the CBMsg3; andreceive, from a terminal device, the CBMsg3 within a CBMsg3 occasion on determined resources.18.The network device of claim 17, wherein the resources comprise:a same subcarrier among a plurality of predetermined subcarriers for a plurality of attempts of the CBMsg3, ora subcarrier randomly selected for each attempt in the plurality of attempts.19.The network device of claim 17, wherein the resources comprise:a plurality of time positions corresponding to a plurality of attempts of the CBMsg3, ora time position randomly selected for each attempt in the plurality of attempts.20.The network device of claim 17, wherein the resources comprise a plurality of subcarriers in a frequency hopping pattern corresponding to a plurality of attempts of the CBMsg3.
Citation Information
Patent Citations
Method for secure handling of early data transmission
US20210120420A1
Integrity protection for frequent small data transmission
US20220046421A1
Method, user equipment, base station, device and medium for contention-based uplink data transmission
WO2020204637A1
Signal transmission and reception method for wireless communication, and device therefor
WO2024072080A1