Devices and methods for communication
The enhancement of small data transmission efficiency in communication systems is achieved by configuring terminal devices with optimized time thresholds and resource periodicities, allowing for improved mobile-terminated SDT and resource management.
Patent Information
- Application Number
- PCT/CN2023/129414
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2023-11-02
- Publication Date
- 2025-05-08
AI Technical Summary
Existing communication systems face challenges in efficiently managing small data transmissions (SDT) due to limitations in resource allocation and timing thresholds, particularly for mobile-terminated SDT and extended resource periodicities.
The proposed solution involves a terminal device that receives configurations for time thresholds and resource periodicities from a network device, allowing it to determine target time thresholds and perform SDT based on these configurations. Additionally, the terminal device can determine hybrid automatic repeat request (HARQ) process identities and decide whether to use configured grant resources for random access SDT based on indications from the network device.
This approach enhances the efficiency of small data transmissions by optimizing time thresholds and resource utilization, improving the reliability of mobile-terminated SDT and enabling effective use of extended resource periodicities.
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Figure CN2023129414_08052025_PF_FP_ABST
Abstract
Description
DEVICES AND METHODS FOR COMMUNICATION
[0001] FIELDS
[0002] Example embodiments of the present disclosure generally relate to the field of communication techniques and in particular, to devices and methods for small data transmission (SDT) enhancement.BACKGROUND
[0003] With developments of communication systems, new technologies have been proposed. For example, to increase the utilization ratio of periodically allocated resources, the communication system may enable multiple devices to share the periodic resources allocated with a configured grant (CG) mechanism. The base station allocates the configured grant resources to multiple terminal devices, and the terminal devices utilize the resources when they have data to transmit. Further, small data transmission (SDT) has been proposed. Specifically, the SDT is a transmission for a short data burst in a connectionless state where a device does not need to establish and teardown connections when small amounts of data need to be sent.SUMMARY
[0004] In general, embodiments of the present disclosure provide a solution on small data transmission.
[0005] In a first aspect, there is provided a terminal device comprising: a processor configured to cause the terminal device to: receive, from a network device, at least one configuration of at least one time threshold for a time interval between an initiating time of a small data transmission and a time of a next configured grant resource available for the small data transmission; determine a target time threshold for a mobile-terminated small data transmission based on the at least one configuration; and perform the mobile-terminated small data transmission to the network device based on the target time threshold.
[0006] In a second aspect, there is provided a terminal device comprising: a processor configured to cause the terminal device to: receive, from a network device, a resource configuration indicating a first resource periodicity, wherein the first resource periodicity is an extended configured grant periodicity or an extended semi persistent scheduling periodicity; perform a configured grant small data transmission to the network device based on the first resource periodicity; and determine a hybrid automatic repeat request process identity based on the first resource periodicity and a first parameter, the first parameter being predefined or being configured by the network device, the hybrid automatic repeat request process identity being associated with the configured grant small data transmission.
[0007] In a third aspect, there is provided a network device comprising: a processor configured to cause the network device to: transmit, to a terminal device, a resource configuration indicating a first resource periodicity, wherein the first resource periodicity is an extended configured grant periodicity or an extended semi persistent scheduling periodicity; transmit, to the terminal device, a configuration of a first parameter, a hybrid automatic repeat request process identity associated with a configured grant small data transmission being determined based on the first resource periodicity and the first parameter; and receive the configured grant small data transmission from the terminal device based on the first resource periodicity.
[0008] In a fourth aspect, there is provided a terminal device comprising: a processor configured to cause the terminal device to: receive, from a network device, an indication indicating whether to use a configured grant resource for a random access small data transmission; and perform the random access small data transmission to the network device based on the indication.
[0009] In a fifth aspect, there is provided a network device comprising: a processor configured to cause the network device to: transmit, to a terminal device, an indication indicating whether to use a configured grant resource for a random access small data transmission; and receive the random access small data transmission from the terminal device based on the indication.
[0010] In a sixth aspect, there is provided a terminal device comprising: a processor configured to cause the terminal device to: in accordance with a determination that a first reference signal quality of a synchronization signal block used in a first random access procedure during a random access small data transmission is less than a threshold, determine whether a second reference signal quality of a second synchronization signal block is greater than or equal to the threshold; and in accordance with a determination that the second reference signal quality is greater than or equal to the threshold, perform a second random access procedure.
[0011] In a seventh aspect, there is provided a communication method performed by a terminal device. The method comprises: receiving, from a network device, at least one configuration of at least one time threshold for a time interval between an initiating time of a small data transmission and a time of a next configured grant resource available for the small data transmission; determining a target time threshold for a mobile-terminated small data transmission based on the at least one configuration; and performing the mobile-terminated small data transmission to the network device based on the target time threshold.
[0012] In an eighth aspect, there is provided a communication method performed by a terminal device. The method comprises: receiving, from a network device, a resource configuration indicating a first resource periodicity, wherein the first resource periodicity is an extended configured grant periodicity or an extended semi persistent scheduling periodicity; performing a configured grant small data transmission to the network device based on the first resource periodicity; and determining a hybrid automatic repeat request process identity based on the first resource periodicity and a first parameter, the first parameter being predefined or being configured by the network device, the hybrid automatic repeat request process identity being associated with the configured grant small data transmission.
[0013] In a ninth aspect, there is provided a communication method performed by a network device. The method comprises: transmitting, to a terminal device, a resource configuration indicating a first resource periodicity, wherein the first resource periodicity is an extended configured grant periodicity or an extended semi persistent scheduling periodicity; transmitting, to the terminal device, a configuration of a first parameter, a hybrid automatic repeat request process identity associated with a configured grant small data transmission being determined based on the first resource periodicity and the first parameter; and receiving the configured grant small data transmission from the terminal device based on the first resource periodicity.
[0014] In a tenth aspect, there is provided a communication method performed by a terminal device. The method comprises: receiving, from a network device, an indication indicating whether to use a configured grant resource for a random access small data transmission; and performing the random access small data transmission to the network device based on the indication.
[0015] In an eleventh aspect, there is provided a communication method performed by a network device. The method comprises: transmitting, to a terminal device, an indication indicating whether to use a configured grant resource for a random access small data transmission; and receiving the random access small data transmission from the terminal device based on the indication.
[0016] In a twelfth aspect, there is provided a communication method performed by a terminal device. The method comprises: in accordance with a determination that a first reference signal quality of a synchronization signal block used in a first random access procedure during a random access small data transmission is less than a threshold, determining whether a second reference signal quality of a second synchronization signal block is greater than or equal to the threshold; and in accordance with a determination that the second reference signal quality is greater than or equal to the threshold, performing a second random access procedure.
[0017] 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 the seventh, eighth, ninth, tenth, eleventh, or twelfth aspect.
[0018] Other features of the present disclosure will become easily comprehensible through the following description.BRIEF DESCRIPTION OF THE DRAWINGS
[0019] 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:
[0020] FIG. 1 illustrates an example communication environment in which example embodiments of the present disclosure can be implemented;
[0021] FIG. 2 illustrates a signaling flow of small data transmission in accordance with some embodiments of the present disclosure;
[0022] FIG. 3 illustrates another signaling flow of small data transmission in accordance with some embodiments of the present disclosure;
[0023] FIG. 4 illustrates another signaling flow of small data transmission in accordance with some embodiments of the present disclosure;
[0024] FIG. 5 illustrates a flowchart of a method for small data transmission according to some example embodiments of the present disclosure;
[0025] FIG. 6 illustrates a flowchart of a method implemented at a terminal device according to some example embodiments of the present disclosure;
[0026] FIG. 7 illustrates a flowchart of a method implemented at a terminal device according to some example embodiments of the present disclosure;
[0027] FIG. 8 illustrates a flowchart of a method implemented at a network device according to some example embodiments of the present disclosure;
[0028] FIG. 9 illustrates a flowchart of a method implemented at a terminal device according to some example embodiments of the present disclosure;
[0029] FIG. 10 illustrates a flowchart of a method implemented at a network device according to some example embodiments of the present disclosure;
[0030] FIG. 11 illustrates a simplified block diagram of an apparatus that is suitable for implementing example embodiments of the present disclosure.
[0031] Throughout the drawings, the same or similar reference numerals represent the same or similar element.DETAILED DESCRIPTION
[0032] 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.
[0033] 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.
[0034] As used herein, the term ‘terminal device’ refers to any device having wireless or wired communication capabilities. Examples of the 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, devices 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 (MR) 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 incorporate 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.
[0035] 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 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.
[0036] 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.
[0037] The terminal or the network device may work on several frequency ranges, e.g., FR1 (e.g., 450 MHz to 6000 MHz) , FR2 (e.g., 24.25GHz to 52.6GHz) , frequency band larger than 100 GHz 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 devices 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.
[0038] 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, channel emulator. In some embodiments, 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 and the other one may be a secondary node. The first network device and the second network device may use different radio access technologies (RATs) . In some embodiments, the first network device may be a first RAT device and the second network device may be a second RAT device. In some embodiments, 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 or the second network device. In some embodiments, 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 some embodiments, 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.
[0039] 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 ‘at least in part based 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.
[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 “resource, ” “transmission resource, ” “uplink resource, ” or “downlink resource” may refer to any resource for performing a communication, such as a resource in time domain, a resource in frequency domain, a resource in space domain, a resource in code domain, or any other resource enabling a communication, and the like. In the following, unless explicitly stated, a resource in both frequency domain and time domain will be used as an example of a transmission resource for describing some example embodiments of the present disclosure. It is noted that example embodiments of the present disclosure are equally applicable to other resources in other domains.
[0042] As used herein, the term “small data transmission (SDT) ” may refer to a procedure allowing data and / or signalling transmission while remaining in radio resource control (RRC) _INACTIVE state (i.e. without transitioning to RRC_CONNECTED state) . Specifically, the SDT is a transmission for a short data burst in a connectionless state where a device does not need to establish and teardown connections when small amounts of data need to be sent. The term “uplink grant” used herein may refer to an indication that is used to indicate an uplink transmission is scheduled. The term “downlink control information (DCI) ” used herein may refer to a dynamic physical layer control message from the network to UE. The term “medium access control (MAC) control element (CE) ” used herein may refer to a structure carrying control information. The term “hybrid automatic repeat request (HARQ) ” used herein may refer to a combination of high-rate forward error correction (FEC) and automatic repeat request (ARQ) error-control, which is implemented to correct the erroneous packets coming from physical layer. The term “HARQ process” may refer to a stop-and-wait process that is used to transmit data. Each HARQ process has an independent HARQ buffer. The HARQ process can be identified by a HARQ process identity (ID) .
[0043] As used herein, the term “configured grant (CG) -SDT” may refer to an SDT using the CG resource (s) . The term “random access (RA) -SDT” may refer to an SDT using resources obtained by the RA procedure.
[0044] As used herein, the term “mobile-terminated (MT) -SDT” may refer to an SDT triggered by DL signal. The term “mobile-originated (MO) -SDT” may refer to an SDT triggered by UL signal. The MT-SDT may be a CG-SDT or an RA-SDT. The MO-SDT may be a CG-SDT or an RA-SDT.
[0045] A used herein, the term “RRC connected state” or “RRC connected mode” used herein may refer to a state in which service radio bearer and data radio bearer are allocated for the terminal device. The term “RRC idle state” or “RRC idle mode” used herein may refer to a state where the terminal device is switched on but does not have any established RRC connection. The term “RRC inactive state” or “RRC inactive mode” used herein may refer to a state where there is an RRC connection that has been suspended.
[0046] FIG. 1 illustrates a schematic diagram of an example communication environment 100 in which example embodiments of the present disclosure can be implemented. In the communication environment 100, a plurality of communication devices, including a terminal device 110 and a network device 120, can communicate with each other.
[0047] In the example of FIG. 1, the terminal device 110 may be a UE and the network device 120 may be a base station serving the UE. The serving area of the network device 120 may be called a cell 102.
[0048] It is to be understood that the number of devices and their connections shown in FIG. 1 are only for the purpose of illustration without suggesting any limitation. The communication environment 100 may include any suitable number of devices configured to implementing example embodiments of the present disclosure. Although not shown, it would be appreciated that one or more additional devices may be located in the cell 102, and one or more additional cells may be deployed in the communication environment 100. It is noted that although illustrated as a network device, the network device 120 may be another device than a network device. Although illustrated as a terminal device, the terminal device 110 may be other device than a terminal device.
[0049] In the following, for the purpose of illustration, some example embodiments are described with the terminal device 110 operating as a UE and the network device 120 operating as a base station. However, in some example embodiments, operations described in connection with a terminal device may be implemented at a network device or other device, and operations described in connection with a network device may be implemented at a terminal device or other device.
[0050] In some example embodiments, if the terminal device 110 is a terminal device and the network device 120 is a network device, a link from the network device 120 to the terminal device 110 is referred to as a downlink (DL) , while a link from the terminal device 110 to the network device 120 is referred to as an uplink (UL) . In DL, the network device 120 is a transmitting (TX) device (or a transmitter) and the terminal device 110 is a receiving (RX) device (or a receiver) . In UL, the terminal device 110 is a TX device (or a transmitter) and the network device 120 is a RX device (or a receiver) .
[0051] The communications in the communication environment 100 may conform to any suitable standards including, but not limited to, Global System for Mobile Communications (GSM) , Long Term Evolution (LTE) , LTE-Evolution, LTE-Advanced (LTE-A) , New Radio (NR) , Wideband Code Division Multiple Access (WCDMA) , Code Division Multiple Access (CDMA) , GSM EDGE Radio Access Network (GERAN) , Machine Type Communication (MTC) and the like. 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 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) communication protocols, 5.5G, 5G-Advanced networks, or the sixth generation (6G) networks.
[0052] As mentioned above, the small data transmission (SDT) in RRC_INACTIVE state has been proposed. For the RRC_INACTIVE state, a transmission of uplink (UL) data may be on pre-configured physical uplink shared channel (PUSCH) resources (i.e. reusing the configured grant type 1) , when a timing advance (TA) is valid. For example, general procedure for SDT over configured grant type 1 resources from INACTIVE state has been proposed. For another example, configuration of the configured grant type 1 resources for SDT in UL for INACTIVE state has been proposed.
[0053] In some cases, a periodicity for configured grant (CG) transmission occasions may be 640ms. For many of the possible use cases with periodic data, such as transmitting meter readings from static devices, the periodicity may be longer. However, if a longer periodicity is introduced, there is no proper solution on SDT.
[0054] In some cases, the support for paging triggered SDT (also referred to as mobile-terminated (MT) -SDT) is specified. For example, MT-SDT triggering mechanism for UEs in RRC_INACTIVE, supporting random access channel (RACH) procedure based and CG-SDT procedure based UL response is specified. In addition, MT-SDT procedure for initial downlink (DL) data reception and subsequent UL / DL data transmission in RRC_INACTIVE is specified.
[0055] For the extended CG-SDT period, at least the following values (1280, 2560, 5120, 10240, 61440, 122880, 307200, 604160, 1208320, 1802240, 3604480 msec) is specified. In some cases, at least the following values are adopted for the parameter cg-SDT-MaxDurationToNext-CG-Occasion-r18 {10000, 60000, 100000, 300000, 600000, 1200000, 1800000, 3600000} msec.
[0056] In some cases, cg-SDT-MaxDurationToNext-CG-Occassion is configured per logical channel (LCH) . If there are multiple LCHs mapped to CG-SDT resource the shortest time is chosen.
[0057] In some cases, if non-SDT data or data for LCHs other than the LCHs mapped to the CG-SDT resource, UE may initiate a new resume procedure before the pending common control channel (CCCH) message is transmitted. A note may be needed in the initiation of SDT section.
[0058] If SDT procedure is ongoing but T319a has not started yet, UE monitors random access network (RAN) paging and if paging message is received, UE can initiate a new resume procedure.
[0059] However, for MT-SDT, since there is no information for DL data, how to determine a maximum duration for CG-SDT needs to be considered. For example, if there are a plurality of LCHs mapped to CG-SDT resource, for MT-SDT, since there is no information for DL data, how to determine the maximum duration needs to be considered.
[0060] According to embodiments of the present disclosure, a solution on enhancing SDT is proposed. In particular, a terminal device receives, from a network device, at least one configuration of at least one time threshold for a time interval between an initiating time of a small data transmission and a time of a next configured grant resource available for the small data transmission. The terminal device determines a target time threshold for a mobile-terminated small data transmission based on the at least one configuration. The terminal device performs the mobile-terminated small data transmission to the network device based on the target time threshold. In this way, a maximum duration for MT-SDT can be determined.
[0061] Reference is made to FIG. 2, which illustrates a signaling flow 200 of small data transmission in accordance with some embodiments of the present disclosure. For the purposes of discussion, the signaling flow 200 will be discussed with reference to FIG. 1, for example, by using the terminal device 110 and the network device 120.
[0062] In operation, the network device 120 transmits (210) , to the terminal device 110 at least one configuration of at least one time threshold for a time interval between an initiating time of a small data transmission and a time of a next configured grant resource available for the small data transmission. The terminal device 110 receives (220) the at least one configuration. For example, the at least one configuration may be at least one cg-SDT-MaxDurationToNext-CG-Occasion.
[0063] The terminal device 110 determines (230) a target time threshold for a MT-SDT based on the at least one configuration. The terminal device 110 performs the MT-SDT to the network device 120 based on the target time threshold. The network device 120 receives (250) the MT-SDT based on the target time threshold.
[0064] In some embodiments, if MT-SDT is triggered, the conditions for CG-SDT may be determined. For example, one of these conditions is that the time gap between the initiation of the SDT procedure and a first available CG occasion for initial CG-SDT transmission with CCCH message is less than a time threshold. By determining (230) the target time threshold, the condition for CG-SDT can be determined.
[0065] In some embodiments, the at least one configuration comprises a plurality of configurations of a plurality of time thresholds for a plurality of LCHs. The terminal device 110 may select the target time threshold from the plurality of time thresholds. By way of example, the terminal device 110 may select a smallest time threshold from the plurality of time thresholds to be the target time threshold.
[0066] In some embodiments, the plurality of configurations comprises a plurality of channel identities of the plurality of logical channels. In some embodiments, a plurality of radio bears is configured for a small data transmission. The plurality of logical channels is associated with the plurality of radio bears and is allowed for a CG SDT.
[0067] In some embodiments, if the network device 120 configure cg-SDT-MaxDurationToNext-CG-Occasion for all radio bears / LCHs configured for SDT, the terminal device 110 may use the shortest value of cg-SDT-MaxDurationToNext-CG-Occasion among all RB / LCHs or all RB / LCHs with DL radio link control (RLC) configuration. That is, the shortest value may be determined as the target time threshold. Such determination of the target time threshold may be regardless of whether there are UL data.
[0068] Table 1 shows an example of a plurality of configurations of a plurality of time thresholds, such as cg-SDT-MaxDurationToNext-CG-Occasion-r18. It is to be understood that Table 1 and any following tables herein are only for the purpose of illustration, without suggesting any limitation. The parameter, value, or calculations in these tables can be adjusted or removed.
[0069] Table 1
[0070] Table 2 shows an example description of CG-SDT-ConfigLCH-TimeGap in Table 1.
[0071] Table 2
[0072] In some embodiments, the terminal device 110 may determine a set of time thresholds from the plurality of time thresholds. The set of time thresholds corresponds to a set of LCHs of the plurality of LCHs with uplink data. The terminal device 110 may select a smallest time threshold from the set of time thresholds to be the target time threshold. For example, if there are UL data, the terminal device 110 may use the shortest value among these LCHs configured with cg-SDT-MaxDurationToNext-CG-Occasion and these LCHs have available UL data. Otherwise, the terminal device 110 may use the shortest value of cg-SDT-MaxDurationToNext-CG-Occasion among all RB / LCHs. That is, the UL data may be considered for the determination of the target time threshold.
[0073] In some embodiments, the at least one configuration comprises a first configuration of a first time threshold for a CCCH. The terminal device 110 may determine the first time threshold to be the target time threshold. In other words, the network device 120 may configure cg-SDT-MaxDurationToNext-CG-Occasion for CCCH or signaling radio bearer zero (SRB0) . The terminal device 110 may determine the target time threshold for MT-SDT based on the cg-SDT-MaxDurationToNext-CG-Occasion for CCCH or SRB0.
[0074] In some cases, it is possible that there is only CCCH message for the first UL message for MT-SDT, so the network device 120 may configure a single cg-SDT-MaxDurationToNext-CG-Occasion for CCCH or SRB0. In some embodiments, the at least one configuration is in at least one of: a system information block (SIB) such as SIB1, or a radio resource control (RRC) release message. Taking the first configuration being included in SIB1 as an example, the first configuration may be shown as Table 3 below. Description of the SIB1 including the first configuration may be shown in Table 4 below.
[0075] Table 3
[0076] Table 4
[0077] In some embodiments, the at least one configuration comprises a second configuration of a second time threshold for a plurality of radio bears. The terminal device 110 may determine the second time threshold to be the target time threshold. For example, the network device 120 may configure one cg-SDT-MaxDurationToNext-CG-Occasion for all RBs configured for SDT. That is, the configuration is per terminal device or per UE for MT-SDT. Once MT-SDT is triggered, the terminal device 110 may use the cg-SDT-MaxDurationToNext-CG-Occasion. Table 5 shows an example of the second configuration. The second configuration may be included in a CG-SDT configuration. Description of the CG-SDT configuration field description may be shown in Table 6 below.
[0078] Table 5
[0079] Table 6
[0080] Several embodiments regarding determining the target time threshold for MT-SDT have been proposed. In this way, if there are a plurality of LCHs mapped to the CG-SDT resource, for MT-SDT, the terminal device 110 can determine the target time threshold (that is, the maximum duration) .
[0081] Alternatively, or in addition, in some embodiments, the terminal device 110 may perform a mobile-originated small data transmission (MO-SDT) to the network device 120 based on the target time threshold. The target time threshold may be determined by using the above methods for determining the target time threshold for the MT-SDT.
[0082] By way of example, if there are a plurality of LCHs mapped to CG-SDT resource, the shortest time threshold may be selected as the target time threshold for the MO-SDT. In one option, there are a plurality of LCHs mapped to the CG-SDT resource, the shortest time threshold of all LCHs configured with cg-SDT-MaxDurationToNext-CG-Occasion may be determined as the target time threshold. Alternatively, in another option, there are a plurality of LCHs mapped to the CG-SDT resource, the shortest time of all LCHs configured with cg-SDT-MaxDurationToNext-CG-Occasion and these LCHs have available UL data may be selected as the target time threshold.
[0083] In some embodiments, for some radio bears configured for SDT, cg-SDT-MaxDurationToNext-CG-Occasion may be configured for these corresponding LCHs which are configured with configuredGrantType1Allowed considering only data from some LCHs that allow the use of CG resources can be transmitted via CG-SDT.
[0084] Several embodiments regarding determining the target time threshold for the MT-SDT and / or for the MO-SDT have been described with respect to FIG. 2. By determining the target time threshold, the SDT can be enhanced.
[0085] In some cases, if long CG periodicity is configured for SDT, how to determine HARQ process ID and CG occasion for CG-SDT needs to be considered. In some cases, if long periodicity for DL semi-persistent scheduling (SPS) is introduced, how to determine the HARQ process ID and SPS occasion needs to be considered.
[0086] According to embodiments of the present disclosure, a solution on enhancing SDT is proposed. In particular, a terminal device receives, from a network device, a resource configuration indicating a first resource periodicity. The first resource periodicity is an extended configured grant periodicity or an extended semi persistent scheduling periodicity. The terminal device performs a CG-SDT to the network device based on the first resource periodicity. The terminal device determines an HARQ ID based on the first resource periodicity and a first parameter. The first parameter is predefined or being configured by the network device. The HARQ ID is associated with the CG-SDT. In this way, the HARQ ID can be determined.
[0087] Reference is made to FIG. 3, which illustrates a signaling flow 300 of small data transmission in accordance with some embodiments of the present disclosure. For the purposes of discussion, the signaling flow 300 will be discussed with reference to FIG. 1, for example, by using the terminal device 110 and the network device 120.
[0088] In operation, the network device 120 transmits (310) , to the terminal device 110, a resource configuration indicating a first resource periodicity. The first resource periodicity is an extended configured grant (CG) periodicity or an extended semi persistent scheduling (SPS) periodicity. The terminal device 110 receives (320) the resource configuration. By way of example, the first resource periodicity may be an extended CG periodicity which is longer than 640ms or any other time length. Table 7 shows an example of the resource configuration.
[0089] Table 7
[0090] In the example of Table 7, the first parameter may be configured as the extendedRangeForSDT, which may be an integer, or an enumerated value. The field description of the first parameter is shown in Table 8 below.
[0091] Table 8
[0092] The terminal device 110 performs (350) a CG-SDT to the network device 120 based on the first resource periodicity. The network device 120 receives (360) the CG-SDT.
[0093] The terminal device 110 determines (370) an HARQ ID based on the first resource periodicity and a first parameter. The HARQ ID is associated with the CG-SDT. In some example embodiments, the first parameter may be predefined, such as 400, 1000 or any other suitable integer. Alternatively, the first parameter may be configured by the network device 120. For example, the network device 120 may transmit (330) a configuration of the first parameter to terminal device 110. The terminal device 110 may receive (340) the configuration. The configured first parameter may be extendedRangeForSDT which refers to a range for extended first periodicity, or any other suitable parameter.
[0094] In some embodiments, if the first resource periodicity is the extended CG periodicity, the HARQ ID may be determined based on the extended CG periodicity and the first parameter. In this way, the terminal device 110 can obtain the correct HARQ process. Table 9 shows an example of determining the HARQ process ID, which may be included in TS 38.321. In Table 9, the first parameter may be extendedRangeForSDT, a parameter n or a fixed value such as 1000. The parameter n may refer to the first parameter which is associated with a predefined value. The periodicity in Table 9 denotes the first resource periodicity.
[0095] Table 9
[0096] In some embodiments, upon configuration of a CG Type 1 for a bandwidth part (BWP) of a serving cell by upper layers, the MAC entity may store the uplink grant provided by upper layers as a configured uplink grant for the indicated BWP of the serving cell; and initialise or re-initialise the configured uplink grant to start in the symbol according to timeDomainOffset, timeReferenceSFN, and S (derived from start and length indicator value (SLIV) or provided by startSymbol as specified in TS 38.214 [7] ) , and to reoccur with periodicity.
[0097] In some cases, the terminal device may determine CG occasion (CG type1 or CG type 2) , if the extended CG periodicity is configured, such as larger than one H-SFN. According to the current formulation, some CG occasions cannot be distinguished. In some embodiments, if the first resource periodicity is the extended CG periodicity, the terminal device 110 may determine (380) a set of CG occasions based on the extended CG periodicity and the first parameter. For example, the set of CG occasions may be used for CG type 1 and CG type 2. In this way, the terminal device 110 can obtain the correct CG occasions. The corrected CG occasions can be distinguished. Table 10 shows an example of determining the CG occasions for CG type1, which may be included in TS 38.321. In Table 10, the first parameter may be extendedRangeForSDT, a parameter n or a fixed value such as 1000. The parameter n may refer to the first parameter which is associated with a predefined value. The periodicity denotes the first resource periodicity.
[0098] Table 10
[0099] Table 11 shows an example of determining the CG occasions for CG type2, which may be included in TS 38.321. In Table 11, the first parameter may be extendedRangeForSDT, a parameter n or a fixed value such as 1000. The parameter n may refer to the first parameter which is associated with a predefined value. The periodicity denotes the first resource periodicity.
[0100] Table 11
[0101] In some embodiments, since the extended CG periodicity (also referred to as a long CG periodicity) is introduced or configured, the corresponding time offset may also be extended. In an option, a new H-SFN level time offset is introduced. For example, there may be two level time offset, one level offset is H-SFN, and the other level time offset is SFN (that is, the current indicated time offset) . In another option, a new large range time offset is introduced. The new larger range time offset may include larger than one H-SFN time offset. In a further option, a new time offset is introduced and it is a time offset of one H-SFN.
[0102] Since larger than one H-SFN CG periodicity is introduced, similar to timeReferenceSFN-r16, H-SFN level time reference is introduced or configured, such as timeReferenceH-SFN-r18. In some embodiments, the network device 120 may transmit a configuration of a time reference in an H-SFN level to the terminal device 110. For example, the network device 120 may configure H-SFN level time reference to the UE via RRC message. For example, the CG-SDT configuration may include a field timeReferenceH-SFN, which indicates H-SFN used for determination of the offset of a resource in time domain. In cases where the first resource periodicity is the extended CG periodicity, the terminal device 110 may determine a set of CG occasions based on the extended CG periodicity and the time reference in the H-SFN level. The terminal device 110 may use the closest H-SFN with the indicated number preceding the reception of the configured grant configuration, see TS 38.321 [3] , clause 5.8.2. If the field timeReferenceH-SFN is not present, the reference H-SFN is 0. Table 12 below shows the CG occasion determined based on the H-SFN level time reference or H-SFN level time offset.
[0103] Table 12
[0104] In some embodiments, if timeReferenceH-SFN is not introduced, the terminal device 110 may determine the H-SFN based on the indicated timeReferenceSFN-r16. An example of determining the H-SFN is shown in Table 13 below, which may be included in TS 38.321.
[0105] Table 13
[0106] In some cases, according to the current specification, the calculation of CURRENT_slot is based on SFN. If a periodicity larger than one H-SFN is configured, only one value is achieved for HARQ process ID. In order to obtain the correct HARQ process ID, if the first resource periodicity is the extended SPS periodicity, the HARQ ID may be determined based on the extended SPS periodicity and the first parameter. For example, the extended SPS periodicity may be configured up to 640ms. If SPS is used for SDT and long periodicity is introduced, the terminal device 110 can obtain the correct HARQ ID based on the first resource periodicity and the first parameter. In some example embodiments, the first parameter may be configured by the network device 120 in the SPS configuration, such as the parameter extendedRangeForSDT as shown in Table 14 below. The SPS configuration field description is shown in Table 15 below.
[0107] Table 14
[0108] Table 15
[0109] Table 16 shows an example of determining the HARQ ID, which may be included in TS 38.321. In Table 16, the first parameter may be extendedRangeForSDT, a parameter n or a fixed value such as 1000. The parameter n may refer to the first parameter which is associated with a predefined value. The periodicity denotes the first resource periodicity.
[0110] Table 16
[0111] In some cases, according to the current specification, the formulation for SPS occasion is based on SFN. Only a periodicity larger than one H-SFN is configured, some SPS occasions cannot be distinguished. In some example embodiments, the terminal device 110 may determine (380) a set of SPS occasions based on the extended SPS periodicity and the first parameter. In this way, the terminal device 110 can obtain the correct SPS occasions. In other words, the SPS occasions can be distinguished. Table 18 shows an example of determining the SPS occasions. In Table 17, the first parameter may be extendedRangeForSDT, a parameter n or a fixed value such as 1000. The parameter n may refer to the first parameter which is associated with a predefined value. The periodicity denotes the first resource periodicity.
[0112] Table 17
[0113] Several embodiments for determining the HARQ process ID and CG occasions or SPS occasions have been described. With the determined HARQ process ID and CG / SPS occasions, the SDT can be enhanced.
[0114] In some mechanisms, for MO-SDT and MT-SDT, according to the current specification, if a delay between an initiating time of a small data transmission and a time of a next configured grant resource available for the small data transmission is not less than the configured time threshold such as the target time threshold described with respect to FIG. 2, random access small data transmission (RA-SDT) may be used. The condition of the target time threshold may be used for an initial transmission such as a first transmission. During the subsequent transmission, CG resource is not used. However, in some cases, the CG resource may be available.
[0115] According to embodiments of the present disclosure, a solution on enhancing SDT is proposed. In particular, a terminal device receives, from a network device, an indication indicating whether to use a configured grant resource for an RA-SDT. The terminal device performs the RA-SDT to the network device based on the indication. In this way, the CG resource can be used in the RA-SDT if the CG resource is available.
[0116] Reference is made to FIG. 4, which illustrates a signaling flow 400 of small data transmission in accordance with some embodiments of the present disclosure. For the purposes of discussion, the signaling flow 400 will be discussed with reference to FIG. 1, for example, by using the terminal device 110 and the network device 120.
[0117] In operation, the network device 120 transmits (410) , to the terminal device 110, an indication indicating whether to use a configured grant resource for an RA-SDT. The terminal device 110 receives (420) the indication. By way of example, the indication is transmitted (410) / received (420) via at least one of: medium access control control element (MAC CE) , downlink control information (DCI) or RRC message.
[0118] The terminal device performs (430) the RA-SDT to the network device 120 based on the indication. The network device 120 receives (440) the RA-SDT. For example, if the RA-SDT is triggered, the network device 120 may transmit the indication to the terminal device 110. In some embodiments, if there are available CG resources, the network device 120 may transmit (410) the indication of using the CG resource to the terminal device 110. If the indication indicates to use the CG resource for the RA-SDT, the terminal device 110 may use the CG resource for the ongoing RA-SDT.
[0119] In this way, the RA-SDT may use the available CG resource (s) . The RA procedure can be reduced. The RA-SDT can thus be improved.
[0120] In some cases, during an ongoing CG-SDT, in case of beam failure where there is no synchronization signal block (SSB) (amongst the SSBs for which CG resources are configured) with reference signal received power (RSRP) value above a preconfigured threshold and data for SDT resource blocks (RBs) is available for transmission, the terminal device triggers RA procedure to recover from the beam failure. However, a similar recovery procedure has not been specified for RA-SDT.
[0121] Furthermore, for release (Rel) -18, if there is an ongoing MT-SDT and if there is a beam failure where the RSRP value of the current beam / SSB (i.e., beam / SSB selected in the last random access procedure during the ongoing MT-SDT procedure) is less than a preconfigured threshold, the terminal device should have a mechanism to recover the beam failure.
[0122] In some mechanisms, whether and when the terminal device measures the SSB in an ongoing RA-SDT should be up to UE implementation.
[0123] In some mechanisms, during the ongoing RA-SDT procedure (including MO-SDT and MT-SDT) , the terminal device may monitor RSRP of the SSB selected in the last successfully completed random access procedure and initiate a random access procedure if the RSRP becomes less than rsrp-ThresholdSSB. It is up to UE implementation when to measure RSRP of the SSB.
[0124] In some cases, if SSB selected during the last random access procedure during the SDT procedure become unsuitable (i.e. SS-RSRP of the SSB < configured threshold) and there is at least one SSB whose SS-RSRP is greater than or equal to the configured threshold, the terminal device initiates random access procedure. The threshold may be signalled in SDT configuration in SIB.
[0125] However, during the RA-SDT procedure, if beam failure occurs, some recovery mechanisms need to be considered. For RA-SDT, beam failure recovery may be considered. According to the current discussion, the legacy rsrp-ThresholdSSB may be used for determining whether random access procedure is triggered. One possible way is that there is SSB above rsrp-ThresholdSSB besides SS-RSRP of the SSB selected in the last successfully completed random access procedure is less than rsrp-ThresholdSSB. However, such beam failure recovery needs to be enhanced.
[0126] According to embodiments of the present disclosure, a solution on enhancing SDT is proposed. In particular, a terminal device determines whether a first reference signal quality of a synchronization signal block used in a first random access (RA) procedure during an RA-SDT is less than a threshold. If the first reference signal quality is less than or equal to the threshold, the terminal device determines whether a second reference signal quality of a second synchronization signal block is greater than or equal to the threshold. If the second reference signal quality is greater than or equal to the threshold, the terminal device performs a second random access procedure. In this way, the RA procedure can be triggered during the RA-SDT procedure. The beam failure recovery can thus be improved.
[0127] FIG. 5 illustrates a flowchart of a method 500 for SDT in accordance with some embodiments of the present disclosure. The method 500 may be implemented at a terminal device. For the purpose of discussion, the method 500 will be described from the perspective of the terminal device 110 in FIG. 1.
[0128] At block 510, the terminal device 110 determines that a first reference signal quality of a synchronization signal block used in a first random access procedure during an RA-SDT is less than a threshold. As used herein, the signal quality may be an RSRP or any other parameter for signal quality. The threshold may be rsrp-ThresholdSSB or any other suitable threshold.
[0129] At block 520, the terminal device 110 determines whether a second reference signal quality of a second synchronization signal block is greater than or equal to the threshold. If the second reference signal quality is greater than or equal to the threshold, at block 530, the terminal device 110 performs a second random access procedure.
[0130] An example of the RA-SDT based on the method 500 may be shown in Table 18, which may be included in TS 38.321.
[0131] Table 18
[0132] It would be appreciated that some example specifications and embodiments are provided above, and the detailed description may be varied.
[0133] Example embodiments for SDT enhancements are described with reference to the signaling flows 200, 300, 400 and the method 500. In some embodiments, embodiments described with reference to two or more of the above signaling flows and the method 500 may be combined. By using these signaling flows and the method, SDT can be improved.
[0134] FIG. 6 illustrates a flowchart of a communication method 600 implemented at a terminal device in accordance with some embodiments of the present disclosure. For the purpose of discussion, the method 600 will be described from the perspective of the terminal device 110 in FIG. 1.
[0135] At block 610, the terminal device 110 receives, from a network device, at least one configuration of at least one time threshold for a time interval between an initiating time of a small data transmission and a time of a next configured grant resource available for the small data transmission.
[0136] At block 620, the terminal device 110 determines a target time threshold for a mobile-terminated small data transmission based on the at least one configuration.
[0137] At block 630, the terminal device 110 performs the mobile-terminated small data transmission to the network device based on the target time threshold.
[0138] In some example embodiments, the at least one configuration comprises a plurality of configurations of a plurality of time thresholds for a plurality of logical channels. The terminal device 110 may select the target time threshold from the plurality of time thresholds.
[0139] In some example embodiments, the terminal device 110 may select a smallest time threshold from the plurality of time thresholds to be the target time threshold.
[0140] In some example embodiments, the terminal device 110 may determine a set of time thresholds from the plurality of time thresholds, the set of time thresholds corresponding to a set of logical channels of the plurality of logical channels with uplink data; and select a smallest time threshold from the set of time thresholds to be the target time threshold.
[0141] In some example embodiments, the terminal device 110 may perform a mobile-originated small data transmission to the network device based on the target time threshold.
[0142] In some example embodiments, the plurality of configurations comprises a plurality of channel identities of the plurality of logical channels.
[0143] In some example embodiments, a plurality of radio bears is configured for a small data transmission, and the plurality of logical channels is associated with the plurality of radio bears and is allowed for a configured grant small data transmission.
[0144] In some example embodiments, the at least one configuration comprises a first configuration of a first time threshold for a common control channel, and the terminal device 110 may determine the first time threshold to be the target time threshold.
[0145] In some example embodiments, the at least one configuration is in at least one of:a system information block, or a radio resource control release message.
[0146] In some example embodiments, the at least one configuration comprises a second configuration of a second time threshold for a plurality of radio bears, and the terminal device 110 may determine the second time threshold to be the target time threshold.
[0147] FIG. 7 illustrates a flowchart of a communication method 700 implemented at a terminal device in accordance with some embodiments of the present disclosure. For the purpose of discussion, the method 700 will be described from the perspective of the terminal device 110 in FIG. 1.
[0148] At block 710, the terminal device 110 receives, from a network device, a resource configuration indicating a first resource periodicity, wherein the first resource periodicity is an extended configured grant periodicity or an extended semi persistent scheduling periodicity.
[0149] At block 720, the terminal device 110 performs a configured grant small data transmission to the network device based on the first resource periodicity.
[0150] At block 730, the terminal device 110 determines a hybrid automatic repeat request process identity based on the first resource periodicity and a first parameter, the first parameter being predefined or being configured by the network device, the hybrid automatic repeat request process identity being associated with the configured grant small data transmission.
[0151] In some example embodiments, in accordance with a determination that the first resource periodicity is the extended configured grant periodicity, the terminal device 110 may determine a set of configured grant occasions based on the extended configured grant periodicity and the first parameter.
[0152] In some example embodiments, the terminal device 110 may receive, from the network device, a configuration of a time reference in a hyper system frame number level. If the first resource periodicity is the extended configured grant periodicity, the terminal device 110 may determine a set of configured grant occasions based on the extended configured grant periodicity and the time reference.
[0153] In some example embodiments, the set of configured grant occasions is used for configured grant type 1 and configured grant type 2.
[0154] In some example embodiments, in accordance with a determination that the first resource periodicity is the extended semi persistent scheduling periodicity, the terminal device 110 may determine a set of semi persistent scheduling occasions based on the extended semi persistent scheduling periodicity and the first parameter.
[0155] FIG. 8 illustrates a flowchart of a communication method 800 implemented at a network device in accordance with some embodiments of the present disclosure. For the purpose of discussion, the method 800 will be described from the perspective of the network device 120 in FIG. 1.
[0156] At block 810, the network device 120 transmits, to a terminal device, a resource configuration indicating a first resource periodicity. The first resource periodicity is an extended configured grant periodicity or an extended semi persistent scheduling periodicity.
[0157] At block 820, the network device 120 transmits, to the terminal device, a configuration of a first parameter, a hybrid automatic repeat request process identity associated with a configured grant small data transmission being determined based on the first resource periodicity and the first parameter.
[0158] At block 830, the network device 120 receives the configured grant small data transmission from the terminal device based on the first resource periodicity.
[0159] In some example embodiments, the network device 120 may transmit, to the terminal device, a configuration of a time reference in a hyper system frame number level.
[0160] FIG. 9 illustrates a flowchart of a communication method 900 implemented at a terminal device in accordance with some embodiments of the present disclosure. For the purpose of discussion, the method 900 will be described from the perspective of the terminal device 110 in FIG. 1.
[0161] At block 910, the terminal device 110 receives, from a network device, an indication indicating whether to use a configured grant resource for a random access small data transmission.
[0162] At block 920, the terminal device 110 performs the random access small data transmission to the network device based on the indication.
[0163] In some example embodiments, the indication is received via at least one of: a medium access control control element, downlink control information, or a radio resource control message.
[0164] FIG. 10 illustrates a flowchart of a communication method 1000 implemented at a network device in accordance with some embodiments of the present disclosure. For the purpose of discussion, the method 1000 will be described from the perspective of the network device 120 in FIG. 1.
[0165] At block 1010, the network device 120 transmits, to a terminal device, an indication indicating whether to use a configured grant resource for a random access small data transmission.
[0166] At block 1020, the network device 120 receives the random access small data transmission from the terminal device based on the indication.
[0167] In some example embodiments, the indication is transmitted via at least one of: a medium access control control element, downlink control information, or a radio resource control message.
[0168] FIG. 11 is a simplified block diagram of a device 1100 that is suitable for implementing embodiments of the present disclosure. The device 1100 can be considered as a further example implementation of any of the devices as shown in FIG. 1. Accordingly, the device 1100 can be implemented at or as at least a part of the terminal device 110 or the network device 120.
[0169] As shown, the device 1100 includes a processor 1110, a memory 1120 coupled to the processor 1110, a suitable transceiver 1140 coupled to the processor 1110, and a communication interface coupled to the transceiver 1140. The memory 1120 stores at least a part of a program 1130. The transceiver 1140 may be for bidirectional communications or a unidirectional communication based on requirements. The transceiver 1140 may include at least one of a transmitter 1142 and a receiver 1144. The transmitter 1142 and the receiver 1144 may be functional modules or physical entities. The transceiver 1140 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.
[0170] The program 1130 is assumed to include program instructions that, when executed by the associated processor 1110, enable the device 1100 to operate in accordance with the embodiments of the present disclosure, as discussed herein with reference to FIGS. 1 to 10. The embodiments herein may be implemented by computer software executable by the processor 1110 of the device 1100, or by hardware, or by a combination of software and hardware. The processor 1110 may be configured to implement various embodiments of the present disclosure. Furthermore, a combination of the processor 1110 and memory 1120 may form processing means 1150 adapted to implement various embodiments of the present disclosure.
[0171] The memory 1120 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 1120 is shown in the device 1100, there may be several physically distinct memory modules in the device 1100. The processor 1110 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 1100 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.
[0172] According to embodiments of the present disclosure, a terminal device comprising a circuitry is provided. The circuitry is configured to: receive, from a network device, at least one configuration of at least one time threshold for a time interval between an initiating time of a small data transmission and a time of a next configured grant resource available for the small data transmission; determine a target time threshold for a mobile-terminated small data transmission based on the at least one configuration; and perform the mobile-terminated small data transmission to the network device based on the target time threshold. According to embodiments of the present disclosure, the circuitry may be configured to perform any method implemented by the terminal device as discussed above.
[0173] According to embodiments of the present disclosure, a terminal device comprising a circuitry is provided. The circuitry is configured to: receive, from a network device, a resource configuration indicating a first resource periodicity, wherein the first resource periodicity is an extended configured grant periodicity or an extended semi persistent scheduling periodicity; perform a configured grant small data transmission to the network device based on the first resource periodicity; and determine a hybrid automatic repeat request process identity based on the first resource periodicity and a first parameter, the first parameter being predefined or being configured by the network device, the hybrid automatic repeat request process identity being associated with the configured grant small data transmission. According to embodiments of the present disclosure, the circuitry may be configured to perform any method implemented by the terminal device as discussed above.
[0174] According to embodiments of the present disclosure, a network device comprising a circuitry is provided. The circuitry is configured to: transmit, to a terminal device, a resource configuration indicating a first resource periodicity, wherein the first resource periodicity is an extended configured grant periodicity or an extended semi persistent scheduling periodicity; transmit, to the terminal device, a configuration of a first parameter, a hybrid automatic repeat request process identity associated with a configured grant small data transmission being determined based on the first resource periodicity and the first parameter; and receive the configured grant small data transmission from the terminal device based on the first resource periodicity. According to embodiments of the present disclosure, the circuitry may be configured to perform any method implemented by the network device as discussed above.
[0175] According to embodiments of the present disclosure, a terminal device comprising a circuitry is provided. The circuitry is configured to: receive, from a network device, an indication indicating whether to use a configured grant resource for a random access small data transmission; and perform the random access small data transmission to the network device based on the indication. According to embodiments of the present disclosure, the circuitry may be configured to perform any method implemented by the terminal device as discussed above.
[0176] According to embodiments of the present disclosure, a network device comprising a circuitry is provided. The circuitry is configured to: transmit, to a terminal device, an indication indicating whether to use a configured grant resource for a random access small data transmission; and receive the random access small data transmission from the terminal device based on the indication. According to embodiments of the present disclosure, the circuitry may be configured to perform any method implemented by the network device as discussed above.
[0177] According to embodiments of the present disclosure, a terminal device comprising a circuitry is provided. The circuitry is configured to: in accordance with a determination that a first reference signal quality of a synchronization signal block used in a first random access procedure during a random access small data transmission is less than a threshold, determine whether a second reference signal quality of a second synchronization signal block is greater than or equal to the threshold; and in accordance with a determination that the second reference signal quality is greater than or equal to the threshold, perform a second random access procedure. According to embodiments of the present disclosure, the circuitry may be configured to perform any method implemented by the terminal device as discussed above.
[0178] 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.
[0179] According to embodiments of the present disclosure, a terminal apparatus is provided. The terminal apparatus comprises means for receiving, from a network device, at least one configuration of at least one time threshold for a time interval between an initiating time of a small data transmission and a time of a next configured grant resource available for the small data transmission; means for determining a target time threshold for a mobile-terminated small data transmission based on the at least one configuration; and means for performing the mobile-terminated small data transmission to the network device based on the target time threshold. In some embodiments, the first apparatus may comprise means for performing the respective operations of the method 600. In some example embodiments, the first apparatus may further comprise means for performing other operations in some example embodiments of the method 600. The means may be implemented in any suitable form. For example, the means may be implemented in a circuitry or software module.
[0180] According to embodiments of the present disclosure, a terminal apparatus is provided. The terminal apparatus comprises means for receiving, from a network device, a resource configuration indicating a first resource periodicity, wherein the first resource periodicity is an extended configured grant periodicity or an extended semi persistent scheduling periodicity; means for performing a configured grant small data transmission to the network device based on the first resource periodicity; and means for determining a hybrid automatic repeat request process identity based on the first resource periodicity and a first parameter, the first parameter being predefined or being configured by the network device, the hybrid automatic repeat request process identity being associated with the configured grant small data transmission. In some embodiments, the second apparatus may comprise means for performing the respective operations of the method 700. In some example embodiments, the second apparatus may further comprise means for performing other operations in some example embodiments of the method 700. The means may be implemented in any suitable form. For example, the means may be implemented in a circuitry or software module.
[0181] According to embodiments of the present disclosure, a network apparatus is provided. The network apparatus comprises means for transmitting, to a terminal device, a resource configuration indicating a first resource periodicity, wherein the first resource periodicity is an extended configured grant periodicity or an extended semi persistent scheduling periodicity; means for transmitting, to the terminal device, a configuration of a first parameter, a hybrid automatic repeat request process identity associated with a configured grant small data transmission being determined based on the first resource periodicity and the first parameter; and means for receiving the configured grant small data transmission from the terminal device based on the first resource periodicity. In some embodiments, the third apparatus may comprise means for performing the respective operations of the method 800. In some example embodiments, the third apparatus may further comprise means for performing other operations in some example embodiments of the method 800. The means may be implemented in any suitable form. For example, the means may be implemented in a circuitry or software module.
[0182] According to embodiments of the present disclosure, a terminal apparatus is provided. The terminal apparatus comprises means for receiving, from a network device, an indication indicating whether to use a configured grant resource for a random access small data transmission; and means for performing the random access small data transmission to the network device based on the indication. In some embodiments, the fourth apparatus may comprise means for performing the respective operations of the method 900. In some example embodiments, the fourth apparatus may further comprise means for performing other operations in some example embodiments of the method 900. The means may be implemented in any suitable form. For example, the means may be implemented in a circuitry or software module.
[0183] According to embodiments of the present disclosure, a network apparatus is provided. The network apparatus comprises means for transmitting, to a terminal device, an indication indicating whether to use a configured grant resource for a random access small data transmission; and means for receiving the random access small data transmission from the terminal device based on the indication. In some embodiments, the fifth apparatus may comprise means for performing the respective operations of the method 1000. In some example embodiments, the fifth apparatus may further comprise means for performing other operations in some example embodiments of the method 1000. The means may be implemented in any suitable form. For example, the means may be implemented in a circuitry or software module.
[0184] According to embodiments of the present disclosure, a terminal apparatus is provided. The terminal apparatus comprises means for in accordance with a determination that a first reference signal quality of a synchronization signal block used in a first random access procedure during a random access small data transmission is less than a threshold, determining whether a second reference signal quality of a second synchronization signal block is greater than or equal to the threshold; and means for in accordance with a determination that the second reference signal quality is greater than or equal to the threshold, performing a second random access procedure. In some embodiments, the sixth apparatus may comprise means for performing the respective operations of the method 500. In some example embodiments, the sixth apparatus may further comprise means for performing other operations in some example embodiments of the method 500. The means may be implemented in any suitable form. For example, the means may be implemented in a circuitry or software module.
[0185] In summary, embodiments of the present disclosure provide the following aspects.
[0186] In an aspect, it is proposed a terminal device comprising: a processor configured to cause the terminal device to: receive, from a network device, at least one configuration of at least one time threshold for a time interval between an initiating time of a small data transmission and a time of a next configured grant resource available for the small data transmission; determine a target time threshold for a mobile-terminated small data transmission based on the at least one configuration; and perform the mobile-terminated small data transmission to the network device based on the target time threshold.
[0187] In some embodiments, the at least one configuration comprises a plurality of configurations of a plurality of time thresholds for a plurality of logical channels, and the processor is further configured to cause the terminal device to: select the target time threshold from the plurality of time thresholds.
[0188] In some embodiments, the processor is further configured to cause the terminal device to: select a smallest time threshold from the plurality of time thresholds to be the target time threshold.
[0189] In some embodiments, the processor is further configured to cause the terminal device to: determine a set of time thresholds from the plurality of time thresholds, the set of time thresholds corresponding to a set of logical channels of the plurality of logical channels with uplink data; and select a smallest time threshold from the set of time thresholds to be the target time threshold.
[0190] In some embodiments, the processor is further configured to cause the terminal device to: perform a mobile-originated small data transmission to the network device based on the target time threshold.
[0191] In some embodiments, the plurality of configurations comprises a plurality of channel identities of the plurality of logical channels.
[0192] In some embodiments, a plurality of radio bears is configured for a small data transmission, and the plurality of logical channels is associated with the plurality of radio bears and is allowed for a configured grant small data transmission.
[0193] In some embodiments, the at least one configuration comprises a first configuration of a first time threshold for a common control channel, and the processor is further configured to cause the terminal device to: determine the first time threshold to be the target time threshold.
[0194] In some embodiments, the at least one configuration is in at least one of: a system information block, or a radio resource control release message.
[0195] In some embodiments, the at least one configuration comprises a second configuration of a second time threshold for a plurality of radio bears, and the processor is further configured to cause the terminal device to: determine the second time threshold to be the target time threshold.
[0196] In an aspect, it is proposed a terminal device comprising: a processor configured to cause the terminal device to: receive, from a network device, a resource configuration indicating a first resource periodicity, wherein the first resource periodicity is an extended configured grant periodicity or an extended semi persistent scheduling periodicity; perform a configured grant small data transmission to the network device based on the first resource periodicity; and determine a hybrid automatic repeat request process identity based on the first resource periodicity and a first parameter, the first parameter being predefined or being configured by the network device, the hybrid automatic repeat request process identity being associated with the configured grant small data transmission.
[0197] In some embodiments, the terminal device is further caused to: in accordance with a determination that the first resource periodicity is the extended configured grant periodicity, determine a set of configured grant occasions based on the extended configured grant periodicity and the first parameter.
[0198] In some embodiments, the set of configured grant occasions is used for configured grant type 1 and configured grant type 2.
[0199] In some embodiments, the terminal device is further caused to: in accordance with a determination that the first resource periodicity is the extended semi persistent scheduling periodicity, determine a set of semi persistent scheduling occasions based on the extended semi persistent scheduling periodicity and the first parameter.
[0200] In an aspect, it is proposed a network device comprising: a processor configured to cause the network device to: transmit, to a terminal device, a resource configuration indicating a first resource periodicity, wherein the first resource periodicity is an extended configured grant periodicity or an extended semi persistent scheduling periodicity; transmit, to the terminal device, a configuration of a first parameter, a hybrid automatic repeat request process identity associated with a configured grant small data transmission being determined based on the first resource periodicity and the first parameter; and receive the configured grant small data transmission from the terminal device based on the first resource periodicity.
[0201] In an aspect, it is proposed a terminal device comprising: a processor configured to cause the terminal device to: receive, from a network device, an indication indicating whether to use a configured grant resource for a random access small data transmission; and perform the random access small data transmission to the network device based on the indication.
[0202] In some embodiments, the indication is received via at least one of: a medium access control control element, downlink control information, or a radio resource control message.
[0203] In an aspect, it is proposed a network device comprising: a processor configured to cause the network device to: transmit, to a terminal device, an indication indicating whether to use a configured grant resource for a random access small data transmission; and receive the random access small data transmission from the terminal device based on the indication.
[0204] In some embodiments, the indication is transmitted via at least one of: a medium access control control element, downlink control information, or a radio resource control message.
[0205] In an aspect, it is proposed a terminal device comprising: a processor configured to cause the terminal device to: in accordance with a determination that a first reference signal quality of a synchronization signal block used in a first random access procedure during a random access small data transmission is less than a threshold, determine whether a second reference signal quality of a second synchronization signal block is greater than or equal to the threshold; and in accordance with a determination that the second reference signal quality is greater than or equal to the threshold, perform a second random access procedure.
[0206] In an aspect, a terminal device comprises: at least one processor; and at least one memory coupled to the at least one processor and storing instructions thereon, the instructions, when executed by the at least one processor, causing the device to perform the method implemented by the terminal device discussed above.
[0207] In an aspect, a network device comprises: at least one processor; and at least one memory coupled to the at least one processor and storing instructions thereon, the instructions, when executed by the at least one processor, causing the device to perform the method implemented by the network device discussed above.
[0208] In an aspect, a computer readable medium having instructions stored thereon, the instructions, when executed on at least one processor, causing the at least one processor to perform the method implemented by the terminal device discussed above.
[0209] In an aspect, a computer readable medium having instructions stored thereon, the instructions, when executed on at least one processor, causing the at least one processor to perform the method implemented by the network device discussed above.
[0210] In an aspect, a computer program comprising instructions, the instructions, when executed on at least one processor, causing the at least one processor to perform the method implemented by the terminal device discussed above.
[0211] In an aspect, a computer program comprising instructions, the instructions, when executed on at least one processor, causing the at least one processor to perform the method implemented by the network device discussed above.
[0212] 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.
[0213] 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 with reference to FIGS. 1 to 11. 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.
[0214] 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.
[0215] 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.
[0216] 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.
[0217] 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:a processor configured to cause the terminal device to:receive, from a network device, at least one configuration of at least one time threshold for a time interval between an initiating time of a small data transmission and a time of a next configured grant resource available for the small data transmission;determine a target time threshold for a mobile-terminated small data transmission based on the at least one configuration; andperform the mobile-terminated small data transmission to the network device based on the target time threshold.2.The terminal device of claim 1, wherein the at least one configuration comprises a plurality of configurations of a plurality of time thresholds for a plurality of logical channels, andthe processor is further configured to cause the terminal device to: select the target time threshold from the plurality of time thresholds.3.The terminal device of claim 2, wherein the processor is further configured to cause the terminal device to:select a smallest time threshold from the plurality of time thresholds to be the target time threshold.4.The terminal device of claim 2, wherein the processor is further configured to cause the terminal device to:determine a set of time thresholds from the plurality of time thresholds, the set of time thresholds corresponding to a set of logical channels of the plurality of logical channels with uplink data; andselect a smallest time threshold from the set of time thresholds to be the target time threshold.5.The terminal device of claim 3 or claim 4, wherein the processor is further configured to cause the terminal device to:perform a mobile-originated small data transmission to the network device based on the target time threshold.6.The terminal device of any of claims 2-5, wherein the plurality of configurations comprises a plurality of channel identities of the plurality of logical channels.7.The terminal device of any of claims 2-6, wherein a plurality of radio bears is configured for a small data transmission, andthe plurality of logical channels is associated with the plurality of radio bears and is allowed for a configured grant small data transmission.8.The terminal device of claim 1, wherein the at least one configuration comprises a first configuration of a first time threshold for a common control channel, andthe processor is further configured to cause the terminal device to: determine the first time threshold to be the target time threshold.9.The terminal device of claim 8, wherein the at least one configuration is in at least one of:a system information block, ora radio resource control release message.10.The terminal device of claim 1, wherein the at least one configuration comprises a second configuration of a second time threshold for a plurality of radio bears, andthe processor is further configured to cause the terminal device to: determine the second time threshold to be the target time threshold.11.A terminal device comprising:a processor configured to cause the terminal device to:receive, from a network device, a resource configuration indicating a first resource periodicity, wherein the first resource periodicity is an extended configured grant periodicity or an extended semi persistent scheduling periodicity;perform a configured grant small data transmission to the network device based on the first resource periodicity; anddetermine a hybrid automatic repeat request process identity based on the first resource periodicity and a first parameter, the first parameter being predefined or being configured by the network device, the hybrid automatic repeat request process identity being associated with the configured grant small data transmission.12.The terminal device of claim 11, wherein the processor is further configured to cause the terminal device to:in accordance with a determination that the first resource periodicity is the extended configured grant periodicity, determine a set of configured grant occasions based on the extended configured grant periodicity and the first parameter.13.The terminal device of claim 11, wherein the processor is further configured to cause the terminal device to:receive, from the network device, a configuration of a time reference in a hyper system frame number level; andin accordance with a determination that the first resource periodicity is the extended configured grant periodicity, determine a set of configured grant occasions based on the extended configured grant periodicity and the time reference.14.The terminal device of claim 12 or claim 13, wherein the set of configured grant occasions is used for configured grant type 1 and configured grant type 2.15.The terminal device of claim 11, wherein the processor is further configured to cause the terminal device to:in accordance with a determination that the first resource periodicity is the extended semi persistent scheduling periodicity, determine a set of semi persistent scheduling occasions based on the extended semi persistent scheduling periodicity and the first parameter.16.A network device comprising:a processor configured to cause the network device to:transmit, to a terminal device, a resource configuration indicating a first resource periodicity, wherein the first resource periodicity is an extended configured grant periodicity or an extended semi persistent scheduling periodicity;transmit, to the terminal device, a configuration of a first parameter, a hybrid automatic repeat request process identity associated with a configured grant small data transmission being determined based on the first resource periodicity and the first parameter; andreceive the configured grant small data transmission from the terminal device based on the first resource periodicity.17.The network device of claim 16, wherein the processor is further configured to cause the network device to:transmit, to the terminal device, a configuration of a time reference in a hyper system frame number level.18.A terminal device comprising:a processor configured to cause the terminal device to:receive, from a network device, an indication indicating whether to use a configured grant resource for a random access small data transmission; andperform the random access small data transmission to the network device based on the indication.19.The terminal device of claim 18, wherein the indication is received via at least one of:a medium access control control element,downlink control information, ora radio resource control message.20.A network device comprising:a processor configured to cause the network device to:transmit, to a terminal device, an indication indicating whether to use a configured grant resource for a random access small data transmission; andreceive the random access small data transmission from the terminal device based on the indication.
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