Devices and methods for communication
The solution addresses the ambiguity in cross-frequency resource scheduling by enabling terminal devices to select TCI states based on configuration information exchanged with network devices, thereby improving communication efficiency and reliability in MIMO and multi-TRP systems.
Patent Information
- Application Number
- PCT/CN2023/129186
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2023-11-01
- Publication Date
- 2025-05-08
AI Technical Summary
Existing communication technologies face challenges in efficiently managing cross-frequency resource scheduling, particularly in multiple input multiple output (MIMO) and multi-transmission and reception point (multi-TRP) systems, where the interpretation of transmission configuration indicator (TCI) state fields across different frequency resources is ambiguous.
The proposed solution involves a terminal device and a network device that exchange configuration information indicating the presence or absence of TCI state selection fields on different frequency resources. The terminal device then selects TCI states based on this information, using a TCI state selection field, a default rule, or ignoring the field altogether, to facilitate communication on the second frequency resource.
This approach enables effective cross-frequency resource scheduling by ensuring that TCI states are correctly selected and applied across different frequency resources, enhancing communication reliability and robustness in MIMO and multi-TRP systems.
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Figure CN2023129186_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 a cross frequency resource scheduling.BACKGROUND
[0003] Technology of multiple input multiple output (MIMO) has been widely used in current wireless communication system, where a large number of antenna elements are used by a network device for communicating with a terminal device. Further, in order to improve the reliability and robustness of the communication between the network device and the terminal device, technology of multi-transmission and reception point (multi-TRP / MTRP) has been proposed and discussed.SUMMARY
[0004] In general, embodiments of the present disclosure provide a solution for a cross frequency resource scheduling.
[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, configuration information comprising at least one of the following: a first indication indicating whether a transmission configuration indicator (TCI) state selection field is present in control information on a first frequency resource, or a second indication indicating whether a TCI state selection field is present in control information on a second frequency resource different from the first frequency resource; receive, from the network device, control information on a first frequency resource, the control information comprising an indicator indicating the second frequency resource; and perform one of the following: communicating with the network device on the second frequency resource by using at least one TCI state, wherein the at least one TCI state is selected from a set of activated TCI states associated with the second frequency resource based at least in part on one of the following: a TCI state selection field comprised in the control information, or a default TCI state selection rule, or ignoring the TCI state selection field comprised in the control information.
[0006] In a second aspect, there is provided a terminal device comprising: a processor configured to cause the terminal device to: receive, from the network device, configuration information indicating: a first bitwidth of TCI state field associated with the first frequency resource and a sconed bitwidth of TCI state field associated with the first frequency resource, wherein the first bitwidth is the same as the second bitwidth; and receive, from the network device on a first frequency resource, control information comprising an indicator indicating the second frequency resource and a TCI state field.
[0007] In a third aspect, there is provided a terminal device comprising: a processor configured to cause the terminal device to: receive, from a network device on a first frequency resource, control information comprising an indicator indicating the second frequency resource and a transmission configuration indicator (TCI) state field; and perform one of the following: expecting the TCI state field corresponding to a codepoint mapped with a full-set of TCI states activated for the second frequency resource, in accordance with a determination that the TCI state field corresponding to a codepoint mapped with a sub-set of TCI states activated for the second frequency resource, updating at least one TCI state in the second frequency resource and applying at least one TCI state not indicated by TCI state field in one of the following: the first frequency resource, the second frequency resource or a reference frequency resource, wherein the at least one TCI state is indicated by the TCI state field.
[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, configuration information comprising at least one of the following: at least one first sounding reference signal (SRS) resource set configured for a first frequency resource, or at least one second SRS resource set configured for a second frequency resource; receive, from the network device on a first frequency resource, a control information comprising an indicator indicating the second frequency resource and an SRS resource set indicator; and determine, based on the SRS resource set indicator, one or more second SRS resource set from the at least one second SRS resource set configured for the second frequency resource.
[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, configuration information comprising at least one of the following: a first indication indicating whether a transmission configuration indicator (TCI) state selection field is present in control information on a first frequency resource, or a second indication indicating whether a TCI state selection field is present in control information on a second frequency resource different from the first frequency resource; transmit, to the terminal device on a first frequency resource, control information comprising an indicator indicating the second frequency resource, wherein, in accordance with a determination that the terminal device is not configured with the first indication, do not configure the second indication for the second frequency resource or all the control-resource sets (CORESETs) in the second frequency resource; in accordance with a determination that the first indication is set to enabled, set the second indication to be enabled for the second frequency resource or all the CORESETs in the second frequency resource, or in accordance with a determination that the first indication is set to disabled, set the second indication to be disabled for the second frequency resource or all the CORESETs in the second frequency resource.
[0010] In a sixth aspect, there is provided a network device comprising: a processor configured to cause the network device to: transmit, to a terminal device, configuration information indicating: a first bitwidth of TCI state field associated with the first frequency resource and a sconed bitwidth of TCI state field associated with the first frequency resource, wherein the first bitwidth is the same as the second bitwidth; and transmit, to the terminal device on a first frequency resource, control information comprising an indicator indicating the second frequency resource and a TCI state field.
[0011] In a seventh aspect, there is provided a network device comprising: a processor configured to cause the network device to: transmit, to a terminal device on a first frequency resource, control information comprising an indicator indicating the second frequency resource and a transmission configuration indicator (TCI) state field, wherein the TCI state field corresponding to a codepoint mapped with a full-set of TCI states activated for the second frequency resource.
[0012] In an eighth aspect, there is provided a network device comprising: a processor configured to cause the terminal device to: transmit, to a terminal device, configuration information comprising at least one of the following: at least one first sounding reference signal (SRS) resource set configured for a first frequency resource, or at least one second SRS resource set configured for a second frequency resource; transmit, to the terminal device on a first frequency resource, a control information comprising an indicator indicating the second frequency resource and an SRS resource set indicator, wherein, a first bitwidth of SRS resource set indicator associated with the first frequency resource is the same as a second bitwidth of SRS resource set indicator associated with the second frequency resource, or a number of SRS resource sets of the at least one first SRS resource set is the same as a number of SRS resource sets of the at least one second SRS resource set.
[0013] In a ninth aspect, there is provided a communication method performed by a terminal device. The method comprises: receiving, from a network device, configuration information comprising at least one of the following: a first indication indicating whether a transmission configuration indicator (TCI) state selection field is present in control information on a first frequency resource, or a second indication indicating whether a TCI state selection field is present in control information on a second frequency resource different from the first frequency resource; receiving, from the network device, control information on a first frequency resource, the control information comprising an indicator indicating the second frequency resource; and performing one of the following: communicating with the network device on the second frequency resource by using at least one TCI state, wherein the at least one TCI state is selected from a set of activated TCI states associated with the second frequency resource based at least in part on one of the following: a TCI state selection field comprised in the control information, or a default TCI state selection rule, or ignoring the TCI state selection field comprised in the control information.
[0014] In a tenth aspect, there is provided a communication method performed by a terminal device. The method comprises: receiving, from the network device, configuration information indicating: a first bitwidth of TCI state field associated with the first frequency resource and a sconed bitwidth of TCI state field associated with the first frequency resource, wherein the first bitwidth is the same as the second bitwidth; and receiving, from the network device on a first frequency resource, control information comprising an indicator indicating the second frequency resource and a TCI state field.
[0015] In an eleventh aspect, there is provided a communication method performed by a terminal device. The method comprises: receiving, from a network device on a first frequency resource, control information comprising an indicator indicating the second frequency resource and a transmission configuration indicator (TCI) state field; and performing one of the following: expecting the TCI state field corresponding to a codepoint mapped with a full-set of TCI states activated for the second frequency resource, in accordance with a determination that the TCI state field corresponding to a codepoint mapped with a sub-set of TCI states activated for the second frequency resource, updating at least one TCI state in the second frequency resource and applying at least one TCI state not indicated by TCI state field in one of the following: the first frequency resource, the second frequency resource or a reference frequency resource, wherein the at least one TCI state is indicated by the TCI state field.
[0016] In a twelfth aspect, there is provided a communication method performed by a terminal device. The method comprises: receiving, from a network device, configuration information comprising at least one of the following: at least one first sounding reference signal (SRS) resource set configured for a first frequency resource, or at least one second SRS resource set configured for a second frequency resource; receiving, from the network device on a first frequency resource, a control information comprising an indicator indicating the second frequency resource and an SRS resource set indicator; and determining, based on the SRS resource set indicator, one or more second SRS resource set from the at least one second SRS resource set configured for the second frequency resource.
[0017] In a thirteenth aspect, there is provided a communication method performed by a network device. The method comprises: transmitting, to a terminal device, configuration information comprising at least one of the following: a first indication indicating whether a transmission configuration indicator (TCI) state selection field is present in control information on a first frequency resource, or a second indication indicating whether a TCI state selection field is present in control information on a second frequency resource different from the first frequency resource; transmitting, to the terminal device on a first frequency resource, control information comprising an indicator indicating the second frequency resource, wherein, in accordance with a determination that the terminal device is not configured with the first indication, do not configure the second indication for the second frequency resource or all the control-resource sets (CORESETs) in the second frequency resource; in accordance with a determination that the first indication is set to enabled, set the second indication to be enabled for the second frequency resource or all the CORESETs in the second frequency resource, or in accordance with a determination that the first indication is set to disabled, set the second indication to be disabled for the second frequency resource or all the CORESETs in the second frequency resource.
[0018] In a fourteenth aspect, there is provided a communication method performed by a network device. The method comprises: transmitting, to a terminal device, configuration information indicating: a first bitwidth of TCI state field associated with the first frequency resource and a sconed bitwidth of TCI state field associated with the first frequency resource, wherein the first bitwidth is the same as the second bitwidth; and transmitting, to the terminal device on a first frequency resource, control information comprising an indicator indicating the second frequency resource and a TCI state field.
[0019] In a fifteenth aspect, there is provided a communication method performed by a network device. The method comprises: transmitting to a terminal device on a first frequency resource, control information comprising an indicator indicating the second frequency resource and a transmission configuration indicator (TCI) state field, wherein the TCI state field corresponding to a codepoint mapped with a full-set of TCI states activated for the second frequency resource.
[0020] In a sixteenth aspect, there is provided a communication method performed by a network device. The method comprises: transmitting, to a terminal device, configuration information comprising at least one of the following: at least one first sounding reference signal (SRS) resource set configured for a first frequency resource, or at least one second SRS resource set configured for a second frequency resource; transmitting, to the terminal device on a first frequency resource, a control information comprising an indicator indicating the second frequency resource and an SRS resource set indicator, wherein, a first bitwidth of SRS resource set indicator associated with the first frequency resource is the same as a second bitwidth of SRS resource set indicator associated with the second frequency resource, or a number of SRS resource sets of the at least one first SRS resource set is the same as a number of SRS resource sets of the at least one second SRS resource set.
[0021] In a seventeenth 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 ninth, tenth, eleventh, twelfth, thirteenth, fourteenth, fifteenth, or sixteenth aspect.
[0022] Other features of the present disclosure will become easily comprehensible through the following description.BRIEF DESCRIPTION OF THE DRAWINGS
[0023] 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:
[0024] FIG. 1 illustrates an example communication environment in which example embodiments of the present disclosure can be implemented;
[0025] FIG. 2 illustrates a signaling flow of communication in accordance with some embodiments of the present disclosure;
[0026] FIG. 3 illustrates a flowchart of a method implemented at a terminal device according to some example embodiments of the present disclosure;
[0027] FIG. 4 illustrates a flowchart of a method implemented at a terminal device according to some example embodiments of the present disclosure;
[0028] FIG. 5 illustrates a flowchart of a method implemented at a terminal device according to some example embodiments of the present disclosure;
[0029] FIG. 6 illustrates a flowchart of a method implemented at a terminal device according to some example embodiments of the present disclosure;
[0030] FIG. 7 illustrates a flowchart of a method implemented at a network device according to some example embodiments of the present disclosure;
[0031] FIG. 8 illustrates a flowchart of a method implemented at a network device according to some example embodiments of the present disclosure;
[0032] FIG. 9 illustrates a flowchart of a method implemented at a network device according to some example embodiments of the present disclosure;
[0033] FIG. 10 illustrates a flowchart of a method implemented at a network device according to some example embodiments of the present disclosure; and
[0034] FIG. 11 illustrates a simplified block diagram of an apparatus that is suitable for implementing example embodiments of the present disclosure.
[0035] Throughout the drawings, the same or similar reference numerals represent the same or similar element.DETAILED DESCRIPTION
[0036] 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.
[0037] 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.
[0038] 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.
[0039] 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.
[0040] 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.
[0041] 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.
[0042] 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.
[0043] 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.
[0044] 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.
[0045] 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.
[0046] As used herein, the term “TRP” may refer to an antenna port or an antenna array (with one or more antenna elements) available to the network device located at a specific geographical location. For example, a network device may be coupled with multiple TRPs in different geographical locations to achieve better coverage. Alternatively, or in addition, multiple TRPs may be incorporated into a network device, or in other words, the network device may comprise the multiple TRPs. The term “TRP” may be also referred to as a cell, such as a macro-cell, a small cell, a pico-cell, a femto-cell, a remote radio head, a relay node, etc. It is to be understood that the term “TRP” may refer to a logical concept which may be physically implemented by various manner.
[0047] There may be no explicit TRP identification (ID) . If multi-downlink control information (M-DCI) is assumed, the TRP ID may be implicitly identified via control resource set (CORESET) Pool Index (CORESETPoolIndex) . If single-DCI (S-DCI) is assumed, the TRP ID may implicitly identified via a first / second joint / UL TCI state or a sounding reference signal (SRS) resource set ID for uplink (UL) transmission at least. Therefore, the term “TRP” can be used interchangeably with the terms “TCI state” , “resource set” , “SRS resource set” , or other RS resource set.
[0048] Further, one panel discussed herein refers to one or more antenna elements deployed at a certain area of a terminal device. A panel discussed herein can refer to downlink panel, uplink panel, panel type, panel status, capability value set, reference signal (RS) resource, RS resource set, antenna port, antenna port group, beam, beam group. In this regard, the terms (and their equivalent expressions) “panel” , “panel type” , “set of antenna port (s) ” , “antenna element (s) ” , “antenna array (s) ” can be used interchangeably.
[0049] As used herein, the terms “UE expects” , “UE does not expect, “terminal device expects” , “terminal device does not expect” may imply restrictions on a configuration of a network device (also referred to as NW configuration) . The terms “UE is not expected to” and “terminal device is not expected to” may imply a terminal implementation, also referred to as UE implementation. In some embodiments, the terms “UE does not expect” and “UE is not expected to” may be used equally.
[0050] As used herein, the terms “precoder” , “precoding” , “precoding matrix” , “beam” , “spatial relation information” , “spatial relation info” , “precoding information” , “precoding information and number of layers” , “precoding matrix indicator (PMI) ” , “precoding matrix indicator” , “transmission precoding matrix indication” , “precoding matrix indication” , “transmission configuration indication state (TCI state) ” , “UL TCI state” , “joint TCI state” , “transmission configuration indicator” , “quasi co-location (QCL) ” , “quasi-co-location” , “QCL parameter” , “QCL assumption” , “QCL relationship” and “spatial relation” can be used interchangeably.
[0051] As there may be correspondences among TRP, TCI, panel, CORESET, SRS resource set, antenna port group, the terms “TRP” , “TCI state” , “TCI” , “CORESET” , “CORESET pool” , “UL TCI state” , “DL TCI state” , “joint TCI state” , “separate TCI state” , “panel” , “SRS resource set” , “antenna port group” and other similar expressions may be used interchangeably.
[0052] The term “aTCI state pair” can be used interchangeably with the terms “apair of joint / UL TCI states” , “two joint / UL TCI states supporting to be applied simultaneously” .
[0053] The term “delay” may be used interchangeably with the terms “switch delay” , “update delay” .
[0054] The term “codepoint” may be used interchangeably with the terms “code value” , “bitmap” , “bit value” , “field value” and “payload” .
[0055] Example parameters used in the present discourse are illustrated in below table 1.
[0056] Table 1
[0057] It should be understood that the above Table 1 is illustrated only for the purpose of illustration without suggesting any limitations. In other words, in other embodiments, other parameters may be used for representing a specific physical meaning in the Table 1. Further, when any new physical meaning for the above specific parameter has been updated / introduced, the updated / introduced physical meaning also be applicable in the present disclosure.
[0058] In the following, although some embodiments are described with respect to two TCI states, these embodiments are only for the purpose of illustration and help those skilled in the art to understand and implement the present disclosure, without suggesting any limitations as to the scope of the present disclosure. In other embodiments, there may be more than two TCI states.
[0059] As used herein, measurement results may refer to a layer 1-reference signal received power (L1-RSRP) , a layer 3 (L3) -RSRP, an L1-signal to interference and noise ratio (L1-SINR) , an L3-SINR, an L1 / L3 received signal strength indicator (RSSI) , an L1 / L3 reference signal received quality (RSRQ) , and so on. The present disclosure is not limited in this regard.
[0060] In the present discourse, a name of a field / indicator / parameter / IE is provided only for the purpose of illustration and help those skilled in the art to understand and implement the present disclosure, without suggesting any limitations as to the scope of the present disclosure. In other words, the name may be changed in other embodiments. Merely for example, “a field of TCI selection” , “a field of TCI state selection” , “a TCI selection field” , “a TCI state selection field” refer to the same physically meanings and may be used interchangeably; similarly, “a field of TCI” , “a field of TCI state” , “a TCI field” , “a TCI state field” and “transmission configuration indication field” refer to the same physically meanings and may be used interchangeably. The present disclosure is not limited in this regard.
[0061] In the present discourse, a parameter / information element (IE) with a suffix of “-r18” / “-r19” means that this parameter / IE is applicable for 3GPP release 18 or release 19. It should be understood that this parameter / IE with a suffix of “-r18” / “-r19” also may be applicable for other 3GPP releases. The present disclosure is not limited in this regard.
[0062] In the present discourse, parameter name like tci-PresentDCI is described with a suffix e.g., “1-2” which is DCI format type information. It should be understood that this parameter / IE with a suffix of “1-2” also may be applicable for other format type. The present disclosure is not limited in this regard.
[0063] In the present discourse, a first frequency resource and a second frequency resource are used as example frequency resources for a cross frequency resource scheduling. In some embodiments, the first and second frequency resources are bandwidth parts, i.e., the first frequency resource is a first BWP while the second frequency resource is a second BWP. Alternatibely, the first and second frequency resources are component carriers, i.e., the first frequency resource is a first component carrier while the second frequency resource is a second component carrier. In other embodiments, the first and second frequency resources may be other frequency resource granularity (ies) . Further, term “frequency resource” may be replaced by “CC” , “BWP” , “carrier” , “cell” , “physical cell” , “cell group” , “band” , “band combination” and other frequency resource granularity (ies) . The present disclosure is not limited in this regard.
[0064] In the present discourse, terms of “a first frequency resource” , “a scheduling frequency resource” , “an active frequency resource” may be used interchangeably; and terms of “a second frequency resource” , “a scheduled frequency resource” , “a frequency resource rather than the active frequency resource” may be used interchangeably.
[0065] As used herein, two TCI states may refer to: two indicated joint TCI states, or two pairs of indicated DL and UL TCI states.
[0066] Principles and implementations of the present disclosure will be described in detail below with reference to the figures.
[0067] Example environment
[0068] FIG. 1 illustrates an example communication network 100 in which embodiments of the present disclosure can be implemented. The communication network 100 includes a network device 120-1 and an optionally network device 120-2 (collectively or individually referred to as network devices 120) . For purpose of discussion, the network device 120-1 is referred to as the first network device 120-1, and the network device 120-2 is referred to as the second network device 120-2. Further, the first network device 101-1 and the second network device 120-1 can communicate with each other. The network device 120 can provide services to a terminal device 110.
[0069] In the environment network 100, a link from the network devices 120 (such as, a first network device 120-1 or the second network device 120-2) to the terminal device 110 is referred to as a DL, while a link from the terminal device 110 to the network devices 120 (such as, a first network device 120-1 or the second network device 120-2) is referred to as an UL. In DL, the first network device 120-1 or the second network device 120-2 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 transmitting TX device (or a transmitter) and the first network device 120-1 or the second network device 120-2 is an RX device (or a receiver) .
[0070] 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. 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.
[0071] In the example of FIG. 1, the TCI state selection may be supported. A parameter tciSelection-PresentInDCI may be introduced in IE of BWP-DownlinkDedicated, and parameter is used to indicate if a field of TCI state selection is present or absent in DCI format 1_1 and DCI format 1_2 for a DL BWP, where the parameter tciSelection-PresentInDCI may be absent or configured to be enabled or disabled.
[0072] Specifically, a field of TCI state selection may be introduced, a bitwidth of the field of TCI state selection is 0 bit if higher layer parameter tciSelection-PresentInDCI is not configured; otherwise 2 bits according to Table 2.
[0073] Table 2 TCI state selection
[0074] When the UE is configured with tciSelection-PresentInDCI jointly for both DCI formats 1_1 and 1_2 in the same DL BWP, and when the UE receives a DCI format 1_1 / 1_2 that schedules or activates PDSCH reception, the UE shall determine the indicated joint / DL TCI state (s) for the PDSCH reception according to the following:
[0075] ● If the DCI format 1_1 / 1_2 indicates codepoint "00" for the [TCI selection field] , the UE shall apply the first one of two indicated joint / DL TCI states to all PDSCH DM-RS port (s) of corresponding PDSCH transmission occasion (s) scheduled or activated by the DCI format 1_1 / 1_2;
[0076] ● If the DCI format 1_1 / 1_2 indicates codepoint "01" for the [TCI selection field] , the UE shall apply the second one of two indicated joint / DL TCI states to all PDSCH DM-RS port (s) of corresponding PDSCH transmission occasion (s) scheduled or activated by the DCI format 1_1 / 1_2;
[0077] ● If the DCI format 1_1 / 1_2 indicates codepoint "10" for the [TCI selection field] , the UE shall apply both indicated joint / DL TCI states to the PDSCH reception scheduled or activated by the DCI format 1_1 / 1_2.
[0078] If the UE is not configured with tciSelection-PresentInDCI and when the UE receives a DCI format 1_1 / 1_2 that schedules / activates PDSCH reception, the UE shall apply both indicated TCI-States to the scheduled or activated PDSCH reception.
[0079] In the example of FIG. 1, the TCI state selection may be supported in case of a cross CC / BWP scheduling. If so, the DCI format 1_1 / 1_2 may contain part of the following fields used for cross CC / BWP scheduling:
[0080] ● an indicator of component carrier (CC) , which may be 1 or 3 bits,
[0081] ● an indicator of bandwidth part (BWP) indicator, which may be 0, 1 or 2 bits as determined by the number of DL BWPs configured by higher layers, excluding the initial DL bandwidth part,
[0082] ● a filed of TCI, (DCI format 1_1) 0 bit if higher layer parameter tci-PresentInDCI is not enabled (not configured or set to be disabled) ; otherwise 3 bits; (DCI format 1_2) 0 bit if higher layer parameter tci-PresentDCI-1-2 is not configured; otherwise 1 or 2 or 3 bits determined by higher layer parameter tci-PresentDCI-1-2,
[0083] ● a field of TCI selection, 0 bit if higher layer parameter tciSelection-PresentInDCI is not configured; otherwise 2 bits according to below table 1.
[0084] In case of BWP / CC switching is also indicated in the DCI, the TCI state field should point to the activated TCI states in the scheduled component carrier or DL BWP. Alternatively, scheduling BWP / CC and scheduled BWP / CC are both assumed to be configured with tci-PresentInDCI or they are both assumed to be not configured with tci-PresentInDCI.
[0085] If a PDSCH is scheduled by a DCI format having the TCI state field present, the TCI state field in DCI in the scheduling component carrier or DL BWP points to the activated TCI states in the scheduled component carrier or DL BWP, the UE shall use the TCI-State according to the value of the TCI state field in the detected PDCCH with DCI for determining PDSCH antenna port quasi co-location.
[0086] In case of DCI format 1_1, if "Bandwidth part indicator" field indicates a bandwidth part other than the active bandwidth part, and if the higher layer parameter tci-PresentInDCI is not enabled (not configured or set to be disabled) for the CORESET used for the PDCCH carrying the DCI format 1_1, the UE assumes tci-PresentInDCI is not enabled (not configured or set to be disabled) for all CORESETs in the indicated bandwidth part; -otherwise, the UE assumes tci-PresentInDCI is enabled for all CORESETs in the indicated bandwidth part.
[0087] In case of DCI format 1_2, if "Bandwidth part indicator" field indicates a bandwidth part other than the active bandwidth part, and if the higher layer parameter tci-PresentDCI-1-2 is not configured for the CORESET used for the PDCCH carrying the DCI format 1_2, the UE assumes tci-PresentDCI-1-2 is not configured for all CORESETs in the indicated bandwidth part; otherwise, the UE assumes tci-PresentDCI-1-2 is configured for all CORESETs in the indicated bandwidth part with the same value configured for the CORESET used for the PDCCH carrying the DCI format 1_2.
[0088] Example processes
[0089] Principle and implementations of the present disclosure will be described in detail below with reference to FIG. 2. For the purpose of discussion, FIG. 2 will be described with reference to FIG. 1.
[0090] It should be understood that although feature (s) / operation (s) are discussed in specific example embodiments separately, unless clearly indicated to the contrary, these feature (s) / operation (s) described in different example embodiments may be used in any suitable combination.
[0091] Further, it is to be understood that the operations at the terminal device 110 and the network device 120 should be coordinated. In other words, the network device 120 and the terminal device 110 should have common understanding about configurations, parameters and so on. Such common understanding may be implemented by any suitable interactions between the network device 120 and the terminal device 110 or both the network device 120 and the terminal device 110 applying the same rule / policy. In the following, although some operations are described from a perspective of the terminal device 110, it is to be understood that the corresponding operations should be performed by the network device 120. Similarly, although some operations are described from a perspective of the network device 120, it is to be understood that the corresponding operations should be performed by the terminal device 110. Merely for brevity, some of the same or similar contents are omitted here.
[0092] Enhancements on configurations of TCI state selection
[0093] When a DCI is received on the first CC / BWP but indicates a scheduling on the second CC / BWP, the interpretation of “TCI selection” is ambiguous. For example, if tciSelection-PresentInDCI is configured for a first (or a second) CC / BWP, while not configured for a second (or s first) CC / BWP, the number of DCI bits are not aligned if DCI in the first CC / BWP is used to schedule PDSCH in the second CC / BWP. Further, the TCI state selection field may be not valid in the second CC / BWP if the second CC / BWP is not for unified TCI extension to multi-TRP.
[0094] In summary, in case of cross frequency resource scheduling, the interpretation of “TCI selection state field” may be ambiguous.
[0095] According to some embodiments of the present disclosure, this issue may be avoided by reasonable configurations as discussed below. In summary, in case of the cross frequency resource scheduling, the tciSelection-PresentInDCI for different frequency resources should be aligned.
[0096] As illustrated in FIG. 2, in operation, the network device 120 transmits 210 configuration information to the terminal device 110, where the configuration information comprises at least one of the following:
[0097] ● a first indication indicating whether a transmission configuration indicator (TCI) state selection field is present in control information on a first frequency resource, or
[0098] ● a second indication indicating whether a TCI state selection field is present in control information on a second frequency resource different from the first frequency resource.
[0099] The network device 120 may further transmit 220 control information comprising an indicator indicating the second frequency resource to the terminal device 110 on a first frequency resource.
[0100] In some embodiments, if the terminal device 110 is not configured with the first indication, the network device 120 may not configure the second indication for the second frequency resource or all the control-resource sets (CORESETs) in the second frequency resource.
[0101] As for the terminal device 110, if the terminal device 110 is not configured with the first indication, the terminal device 110 may expect the second indication is not configured for the second frequency resource or all the control-resource sets (CORESETs) in the second frequency resource.
[0102] Alternatively, or in addition, in some embodiments, if the first indication is set to enabled, the network device 120 sets the second indication to be enabled for the second frequency resource or all the CORESETs in the second frequency resource.
[0103] As for the terminal device 110, if the first indication is set to enabled, the terminal device 110 may expect the second indication is set to enabled for the second frequency resource or all the CORESETs in the second frequency resource.
[0104] Alternatively, or in addition, in some embodiments, if the first indication is set to disabled, the network device 120 sets the second indication to be disabled for the second frequency resource or all the CORESETs in the second frequency resource.
[0105] As for the terminal device 110, if the first indication is set to disabled, the terminal device 110 may expect the second indication is set to disabled for the second frequency resource or all the CORESETs in the second frequency resource.
[0106] In some embodiments, a bitwidth of the TCI state selection field is determined based on a number of TCI state selections. Specifically, the bitwidth of the TCI state selection field may be 0, 1, 2, 3 and so on.
[0107] Merely for better understanding to the above processes, some example embodiments are discussed as below.
[0108] When aligning the configurations of TCI state selection, both the scheduling frequency resource and scheduled frequency resource are assumed to be configured with tciSelection-PresentInDCI or they are both assumed to be not configured with tciSelection-PresentInDCI. In this way, the cross frequency resource PDSCH scheduling with TCI selection field may be well supported.
[0109] In some embodiments, the terminal device 110 does not expect to be configured with different values of tciSelection-PresentInDCI, or the terminal device 110is not expected to be configured with different values of tciSelection-PresentInDCI.
[0110] In some embodiments, if "Bandwidth part indicator" field indicates a bandwidth part other than the active bandwidth part, and if the higher layer parameter tciSelection-PresentInDCI is not enabled (not configured or set to be disabled) for the CORESET used for the PDCCH carrying the DCI format 1_1 or DCI format 1_2, the terminal device 110 assumes tciSelection-PresentInDCI is not enabled (not configured or set to be disabled) for all CORESETs in the indicated bandwidth part; otherwise, the terminal device 110 assumes tciSelection-PresentInDCI is enabled for all CORESETs in the indicated bandwidth part.
[0111] In some embodiments, for DCI format 1_1 / 1_2, if "Bandwidth part indicator" field indicates a bandwidth part other than the active bandwidth part, and if the higher layer parameter tciSelection-PresentInDCI is not enabled (not configured or set to be disabled) for the active bandwidth part used for the PDCCH carrying the DCI format 1_1 or DCI format 1_2, the terminal device 110 assumes tciSelection-PresentInDCI is not enabled (not configured or set to be disabled) in the indicated bandwidth part; otherwise, the terminal device 110 assumes tciSelection-PresentInDCI is enabled in the indicated bandwidth part.
[0112] Still refer to FIG. 2, the network device 120 may transmit configuration information to the terminal device 110, where the configuration information may be comprised in an RRC signalling.
[0113] In some embodiments, the configuration information may include related information for respective frequency resources.
[0114] In some embodiments, the configuration information may include TCI states configuration indicating at least one TCI state.
[0115] Alternatively, or in addition, in some embodiments, the configuration information may include tci-PresentDCI configuration. Specifically, this field indicates whether a TCI state field is present or absent in DCI format 1_1 and DCI format 4_2. When the field is absent, the terminal device 110considers the TCI state field to be absent / disabled. In case of cross carrier scheduling, the network device 120 sets this field to enabled for the ControlResourceSet used for cross carrier scheduling in DCI format 1_1 in the scheduling cell / BWP if enableDefaultBeamForCCS is not configured. In some embodiments, the configuration information may include tci-PresentDCI-1-2 configuration, which configures the number of bits for “Transmission configuration indicator “in DCI format 1_2. When the field is absent, the terminal device 110 applies the value of 0 bit for the “Transmission configuration indicator” in DCI format 1_2. In case of cross carrier scheduling, the network device 120 configures this field for the ControlResourceSet used for cross carrier scheduling in DCI format 1_2 in the scheduling cell / BWP if enableDefaultBeamForCCS is not configured.
[0116] Alternatively, or in addition, in some embodiments, the configuration information may include tciSelection-PresentInDCI configuration. This parameter is used to indicate if a TCI state selection field is present or absent in DCI format 1_1 and DCI format 1_2 for a DL BWP. Additionally, in some embodiments, tciSelection-PresentInDCI may be separately configured for different DCI formats.
[0117] In some embodiments, for different frequency resources, the value of tciSelection-PresentInDCI should be the same, i.e., both are configured as “enabled” (or “not enabled” , i.e., not configured or set to be disabled) , or both are not configured with this IE (absent) .
[0118] In addition, or alternatively, in case of cross carrier or cross BWP scheduling, the network device 120 configures (or must configure) this field for cross carrier or cross BWP scheduling in DCI format 1_1 / 1_2 in the scheduling cell / BWP.
[0119] In addition, the network device 120 configures (or must configure) this field for cross carrier or cross BWP scheduling in DCI format 1_1 / 1_2 in the scheduling cell / BWP if default behavior on cross carrier or cross BWP scheduling is not supported by UE, or is not enabled (not configured or set to be disabled) / configured for unified TCI for multi-TRP.
[0120] In FIG. 2, the TCI state (s) configured in the RRC signalling may be activated / indicated 220 by an activation / indication message, such as, a MAC CE. Specifically, to activate sets of TCI states configured by the RRC signalling, where each set is comprised of up to two TCI state (s) for DL and UL signals / channels, or up to two TCI state (s) for DL channels / signals and up to two TCI state (s) for UL channels / signals to the codepoints of the DCI field 'Transmission Configuration Indication' for one or for a set of CCs / DL BWPs, and if applicable, for one or for a set of CCs / UL BWPs. Additionally, if the RRC only configures one or two TCI states, the MAC CE message may be omitted.
[0121] In some embodiments, it is assumed that for MAC CE activation of TCI states are provided for both scheduling BWP and scheduled BWP.
[0122] In some embodiments, a DCI (i.e., PDCCH carries DCI) is received 230 on the first BWP / CC for cross carrier or cross BWP scheduling.
[0123] In some embodiments, the DCI may comprise "Bandwidth part indicator" field which indicates a bandwidth part other than the active bandwidth part, which means that schedules / activates PDSCH reception in a bandwidth part other than the active bandwidth part.
[0124] Alternatively, or in addition, in some embodiments, the DCI may comprise "Transmission configuration indication (TCI) " field. In case of DCI format 1_1, the "Transmission configuration indication (TCI) " field is 0 bit if higher layer parameter tci-PresentInDCI is not enabled (not configured or set to be disabled) ; otherwise 3 bits. In case of DCI format 1_2, the "Transmission configuration indication (TCI) " field is 0 bit if higher layer parameter tci-PresentDCI-1-2 is not configured; otherwise 1 or 2 or 3 bits determined by higher layer parameter tci-PresentDCI-1-2.
[0125] Alternatively, or in addition, in some embodiments, the DCI may comprise a TCI state selection field, where the TCI state selection field is 0 bit if higher layer parameter tciSelection-PresentInDCI is not configured; otherwise, the TCI state selection field is 2 bits.
[0126] In addition, the number of bits of the TCI state selection field may be configured, which may be for example 1, 2, 3, 4, depending on the number of selections for selecting a set of N TCI states out of M TCI states.
[0127] In some embodiments, if the "Bandwidth part indicator" field indicates a BWP other than the active BWP, if the higher layer parameter tciSelection-PresentInDCI is not enabled (not configured or set to be disabled) for scheduling BWP, the terminal device 110 assumes tciSelection-PresentInDCI is not enabled (not configured or set to be disabled) for the scheduled BWP; otherwise, the terminal device 110assumes tciSelection-PresentInDCI is enabled for the scheduled BWP.
[0128] Then, the terminal device 110 may perform data transmission (such as, PDSCH) on the second BWP. Specifically, if configured, TCI state field points to the activated TCI states in the scheduled component carrier or DL BWP, the terminal device 110 shall use the TCI-State according to the value of the 'Transmission Configuration Indication (TCI) ' field in the detected PDCCH with DCI for determining PDSCH antenna port quasi co-location.
[0129] In addition to a mandatary configurational requirement, the terminal device 110 also may assume the tciSelection-PresentInDCI for different frequency resources are aligned regardless of the actual configuration information, as discussed below.
[0130] In some embodiments, if the terminal device 110 is not configured with the first indication, the terminal device 110 may assume the second indication is not configured for the second frequency resource or all the control-resource sets (CORESETs) in the second frequency resource.
[0131] Alternatively, or in addition, in some embodiments, if the first indication is set to enabled, the terminal device 110 may assume the second indication is set to enabled for the second frequency resource or all the CORESETs in the second frequency resource.
[0132] Alternatively, or in addition, in some embodiments, if the first indication is set to disabled, the terminal device 110 may assume the second indication is set to disabled for the second frequency resource or all the CORESETs in the second frequency resource.
[0133] According to some embodiments of the present disclosure, regardless of whether the tciSelection-PresentInDCI for different frequency resources are aligned, the terminal device 110 may well handle the scenario of cross frequency resource scheduling as discussed below.
[0134] In operation, the terminal device 110 receives configuration information from a network device 120, where the configuration information comprises at least one of the following:
[0135] ● a first indication indicating whether a transmission configuration indicator (TCI) state selection field is present in control information on a first frequency resource, or
[0136] ● a second indication indicating whether a TCI state selection field is present in control information on a second frequency resource different from the first frequency resource.
[0137] The terminal device 110 further receives control information from the network device 120, where the control information is received on a first frequency resource and comprises an indicator indicating the second frequency resource.
[0138] In some embodiments, the terminal device 110 communicates with the network device 120 on the second frequency resource by using at least one TCI state, wherein the at least one TCI state is selected from a set of activated TCI states associated with the second frequency resource based at least in part on one of the following: a TCI state selection field comprised in the control information, or a default TCI state selection rule. Alternatively, in some embodiments, the terminal device 110 ignores the TCI state selection field comprised in the control information.
[0139] Additionally, in some embodiments, the default TCI state selection rule comprises one of the following:
[0140] ● applying a first activated TCI state associated with the second frequency resource,
[0141] ● applying a second activated TCI state associated with the second frequency resource, or
[0142] ● applying both the first and second TCI states.
[0143] Additionally, in some embodiments, the terminal device 110 may select at least one TCI state from a set of activated TCI states, where the set of activated TCI states is one of the following:
[0144] ● two TCI states indicated by a TCI state field comprised in the control information,
[0145] ● two TCI states activated by a medium access control (MAC) control element,
[0146] ● two TCI states configured by a radio resource control (RRC) signalling, or
[0147] ● two TCI states configured for a reference frequency resource.
[0148] In some embodiments, the reference frequency resource is one of the following: a frequency resource with a lowest or highest identity, or a frequency resource associated with the maximum bitwidth of TCI state field.
[0149] In the following, example processes at the terminal device 110 will be discussed according to different scenarios.
[0150] In some embodiments, if a number of activated TCI states less than a threshold number, the terminal device 110 may ignore the TCI state selection field or apply the TCI state selection field among a set of TCI states associated with a reference frequency resource.
[0151] In some embodiments, if the first indication is set to enabled and the second indication is set to disabled or not configured, the terminal device 110 may perform one of the following:
[0152] ● applying the default TCI selection rule among a set of activated TCI states associated with the second frequency resource,
[0153] ● ignoring the TCI state selection field,
[0154] ● assuming the TCI selection filed is set to be a specific codepoint,
[0155] ● performing a TCI selection indicated by the TCI state selection filed among a set of activated TCI states associated with the second frequency resource, or
[0156] ● applying at least default TCI state in the second frequency resource.
[0157] In some embodiments, the terminal device 110 may apply the default TCI selection rule if one of the following:
[0158] ● the TCI state selection field is absent,
[0159] ● the first indication is not configured or set to disabled, and the second indication is not configured or set to disabled;
[0160] ● the first indication is set to disabled and the second indication is set to enabled, or
[0161] ● the first frequency resource associated with a single-TCI mode, the second frequency resource associated with a multi-TCI mode.
[0162] In some embodiments, if the first indication is set to enabled and the second frequency resource associated with a single-TCI mode, the terminal device 110 may perform one of the following:
[0163] ● ignoring the TCI state selection field, or
[0164] ● assuming or expect one TCI state is indicated or selected.
[0165] Optionally, in order to ensure the network device 120 may determine proper configuration information for the terminal device 110, the terminal device 110 may provide capability-related information to the network device 120.
[0166] In some embodiments, the terminal device 110 may transmit capability-related information to the network device 120, where the capability-related information of the terminal device 110 may indicates at least one of the following:
[0167] ● whether support to be configured with different configurations about whether a field of TCI state selection is present in a control information for different frequency resources;
[0168] ● whether support no configuration of about whether a field of TCI state selection is present in a control information if a cross frequency resource scheduling is enabled;
[0169] ● whether support a default configuration of TCI selection for a cross frequency resource scheduling;
[0170] ● whether support applying the TCI selection field in the scheduling frequency resource for a cross frequency resource scheduling; or
[0171] ● whether support a hybrid configuration of single-TCI and multi-TCI in different frequency resources.
[0172] Merely for better understanding to the above processes, some example embodiments are discussed as below.
[0173] Still refer to FIG. 2. As illustrated in FIG. 2, in case of a cross frequency resource scheduling, data transmissions (PDSCHs) may be performed on the second BWP.
[0174] In some embodiments, the terminal device 110 shall use the TCI-State (s) in the scheduled component carrier or DL BWP, according to the value of the TCI state field and TCI state selection field in the detected PDCCH with DCI for determining PDSCH antenna port quasi co-location.
[0175] In some embodiments, if TCI state selection field is not present (i.e., 0 bits) , the terminal device 110 shall assume to apply both activated TCI states in the scheduled component carrier or DL BWP, e.g., the terminal device 110shall use the both indicated TCI states in the scheduled component carrier or DL BWP according to the value of the 'Transmission Configuration Indication' field in the detected PDCCH with DCI for determining PDSCH antenna port quasi co-location.
[0176] In some embodiments, if TCI selection field is present, the indicated selection is among activated TCI states in the scheduled component carrier or DL BWP, the terminal device 110 shall use the TCI state (s) in the scheduled component carrier or DL BWP according to the value of the TCI selection field and the value of the 'Transmission Configuration Indication' field in the detected PDCCH with DCI for determining PDSCH antenna port quasi co-location.
[0177] In some embodiments, it is reasonable to assume that for two TCI states are provided / activated for scheduled BWP. In one example, the TCI state field is present in DCI, and two TCI state (s) are mapped to (e.g., via MAC CE) the indicated codepoint of this TCI field. In another example, the TCI state field is not present in DCI, but two TCI state (s) are configured (e.g., via RRC) / activated (e.g., via MAC CE) for the scheduling BWP and scheduled BWP, respectively. Additionally, the two TCI states sharing the same two TCI state IDs in both scheduling and scheduled BWPs.
[0178] In a further example, only one TCI state is provided / activated for the scheduled BWP. In this event, the TCI state selection filed is not valid, and the terminal device 110 can only apply the one TCI state.
[0179] In a further example, no TCI state is provided / activated for the scheduled BWP. In this event, the TCI state selection filed is not valid and the terminal device 110 may ignore TCI state selection field and apply a default beam / TCI state, Alternatively, if there are common TCI state IDs for the scheduling and scheduled BWP, the TCI state selection field may be considered as valid, the terminal device 110 may apply TCI selection field to select TCI state ID (s) .
[0180] In some embodiments, in case that tciSelection-PresentInDCI is enabled for both BWPs, if a PDSCH is scheduled by a DCI format having the TCI selection state field present, the TCI selection state field in DCI in the scheduling component carrier or DL BWP points to the activated TCI states in the scheduled component carrier or DL BWP, the terminal device shall use the TCI-State according to the codepoint of TCI selection state field in the detected PDCCH with DCI for determining PDSCH antenna port quasi co-location.
[0181] In some embodiments, if tciSelection-PresentInDCI is enabled for both BWPs, when the terminal device 110 is configured with tciSelection-PresentInDCI jointly for both DCI formats 1_1 and 1_2 in the same DL BWP, and when the terminal device 110 receives a DCI format 1_1 / 1_2 that schedules or activates PDSCH reception in a bandwidth part other than the active bandwidth part, the terminal device 110 shall determine the indicated joint / DL TCI state (s) in a bandwidth part other than the active bandwidth part for the PDSCH reception according to the following:
[0182] ● If the DCI format 1_1 / 1_2 indicates codepoint "00" for the [TCI selection field] , the UE shall apply the first one of two indicated joint / DL TCI states in the scheduled component carrier or DL BWP to all PDSCH DM-RS port (s) of corresponding PDSCH transmission occasion (s) scheduled or activated by the DCI format 1_1 / 1_2;
[0183] ● If the DCI format 1_1 / 1_2 indicates codepoint "01" for the [TCI selection field] , the UE shall apply the second one of two indicated joint / DL TCI states in the scheduled component carrier or DL BWP to all PDSCH DM-RS port (s) of corresponding PDSCH transmission occasion (s) scheduled or activated by the DCI format 1_1 / 1_2;
[0184] ● If the DCI format 1_1 / 1_2 indicates codepoint "10" for the [TCI selection field] , the UE shall apply both indicated joint / DL TCI states in the scheduled component carrier or DL BWP to the PDSCH reception scheduled or activated by the DCI format 1_1 / 1_2.
[0185] In some embodiments, in case that tciSelection-PresentInDCI is not configured for both BWPs and when the UE receives a DCI format 1_1 / 1_2 that schedules / activates PDSCH reception in a bandwidth part other than the active bandwidth part, the terminal device 110 shall apply both indicated TCI-States in a bandwidth part other than the active bandwidth part to the scheduled or activated PDSCH reception.
[0186] Optionally, in order to ensure the network device 120 may determine proper configuration information for the terminal device 110, the terminal device 110 may provide capability-related information to the network device 120. The capability-related information, includes but is not limited to,
[0187] ● Whether terminal device 110supports different configuration of tciSelection-PresentInDCI in different BWP / CC;
[0188] ● Whether terminal device 110supports no configuration of tciSelection-PresentInDCI when cross BWP / CC scheduling is enabled;
[0189] ● Whether terminal device 110supports default TCI state selection for cross BWP / CC scheduling;
[0190] ● Whether terminal device 110supports to apply TCI state selection field in scheduling BWP / CC for cross BWP / CC scheduling;
[0191] ● Whether terminal device 110supports a mixed configuration of S-TRP and M-TRP in different BWP / CC.
[0192] Optionally, the network device 120 may provide default configuration to the terminal device 110, where the default configuration includes but is not limited to, default TCI state selection rule for cross BWP / CC scheduling: apply the first TCI state, second TCI state, both or none of the two indicated TCI states on the scheduled BWP / CC when TCI selection is not present.
[0193] More details about the scenario where the TCI state selection configurations are not aligned will be discussed as below.
[0194] In some embodiments, if scheduling BWP / CC is configured with tciSelection-PresentInDCI, and scheduled BWP / CC is not configured with tciSelection-PresentInDCI, the terminal device 110 may ignore the TCI selection field in DCI. In other words, the terminal device 110 may ignore the TCI selection field comprised in a DCI received in scheduling BWP / CC, if the DCI is used for scheduling a BWP / CC different from the scheduling BWP / CC and the tciSelection-PresentInDCI for this BWP / CC is not enabled.
[0195] Alternatively or in addition, in some embodiments, the terminal device 110 may apply both indicated TCI-States in a bandwidth part other than the active bandwidth part to the scheduled or activated PDSCH reception, or, in some embodiments, the terminal device 110 apply first / second / both indicated TCI-States based on UE capability, configurations or pre-defined rules.
[0196] In some embodiments, if scheduling BWP / CC is configured with tciSelection-PresentInDCI, and scheduled BWP / CC is not configured with tciSelection-PresentInDCI, the terminal device 110 may assume TCI selection field is with codepoint “10” , (or “11” ) . In other words, the terminal device 110 may assume the TCI selection field comprised in a DCI received in scheduling BWP / CC with codepoint “10” , (or “11” ) , if the DCI is used for scheduling a BWP / CC different from the scheduling BWP / CC and the tciSelection-PresentInDCI for this BWP / CC is not enabled.
[0197] In some embodiments, if scheduling BWP / CC is configured with tciSelection-PresentInDCI, and scheduled BWP / CC is NOT configured with tciSelection-PresentInDCI, the terminal device 110 may apply the TCI selection indicated in the TCI selection field in scheduling BWP / CC among TCI states in the scheduled BWP / CC.
[0198] In some embodiments, if scheduling BWP / CC is configured with tciSelection-PresentInDCI, and scheduled BWP / CC is NOT configured with tciSelection-PresentInDCI, the terminal device 110 may assume default beams in the scheduled BWP / CC. Additionally, the terminal device 110 may assume defaults beams till the next TCI state activation / indication.
[0199] In some embodiments, if scheduling BWP / CC is NOT configured with tciSelection-PresentInDCI, AND scheduled BWP / CC IS configured with tciSelection-PresentInDCI, the terminal device 110 may assume the default behavior on TCI selection.
[0200] In some embodiments, if scheduling BWP / CC is NOT configured with tciSelection-PresentInDCI, AND scheduled BWP / CC IS configured with tciSelection-PresentInDCI, the terminal device 110 may apply both indicated TCI-States in a bandwidth part other than the active bandwidth part to the scheduled or activated PDSCH reception. In addition, the terminal device 110 may assume both indicated TCI-States till the reception of the next DCI with TCI selection field.
[0201] In case of scenarios with mixed STRP and MTRP operations, based on UE capability, for example, first BWP is for STRP (cannot be configured with tciSelection-PresentInDCI) , and second BWP is for MTRP (may or may not be configured with tciSelection-PresentInDCI) .
[0202] In some embodiments, if scheduling BWP / CC is configured with tciSelection-PresentInDCI, AND scheduled BWP / CC is STRP, the terminal device 110 may ignore the TCI selection field in DCI, or assume only one TCI state for DL and UL signals / channels, or only one TCI state (s) for DL channels / signals and one TCI state (s) for UL channels / signals to the codepoints of the TCI field for the scheduled BWP / CC.
[0203] In some embodiments, if scheduling BWP / CC is STRP, AND scheduled BWP / CC is configured with tciSelection-PresentInDCI, the terminal device 110 may assume the default behavior on TCI selection.
[0204] In some embodiments, if scheduling BWP / CC is STRP, AND scheduled BWP / CC is configured with tciSelection-PresentInDCI, the terminal device 110 may apply the indicated TCI-States in a bandwidth part other than the active bandwidth part to the scheduled or activated PDSCH reception. Further, the indicated TCI-States in scheduled BWP is with the same ID as the one indicated in TCI field in the scheduling BWP.
[0205] In some embodiments, if scheduling BWP / CC is STRP, AND scheduled BWP / CC is configured with tciSelection-PresentInDCI, the terminal device 110 may apply both indicated TCI-States in a bandwidth part other than the active bandwidth part to the scheduled or activated PDSCH reception, or the terminal device may apply the first / second / both indicated TCI-States based on UE capability, configurations or pre- defined rules.
[0206] In some embodiments, if scheduling BWP / CC is STRP, AND scheduled BWP / CC is MTRP but NOT configured with tciSelection-PresentInDCI, the terminal device may assume the default behavior on TCI selection, for example, the terminal device may apply both indicated TCI-States in a bandwidth part other than the active bandwidth part to the scheduled or activated PDSCH reception.
[0207] In some embodiments, for BWP switching, for example, RRC based BWP switch, or timer-based based BWP switch where BWP is switched back when the associated timer (for example, bwp-InactivityTimer) expirers , the terminal device may ignore the TCI selection field and apply a default beam / TCI state. In some embodiments, the terminal device 110 may be configured with one or multiple lists of BWPs / CCs for simultaneous TCI state update or simultaneous TCI state selection.
[0208] In some embodiments, the first BWP / CC and second BWP / CC may be configured in the same list of BWPs / CCs.
[0209] In some embodiments, for any BWP / CC in the same list, tciSelection-PresentInDCI configuration may be the same.
[0210] In some embodiments, a reference BWP / CC may be the specific BWP / CC (e.g., the first / last, the one with lowest / highest ID) in the same list containing the first BWP / CC and / or second BWP / CC.
[0211] In some embodiments, the terminal device 110 may report its capability on whether supporting the list of BWPs / CCs for simultaneous TCI state update or simultaneous TCI state selection.
[0212] In some embodiments, the terminal device 110 may report its capability on the number of lists of BWPs / CCs for simultaneous TCI state update or simultaneous TCI state selection.
[0213] In some embodiments, the terminal device 110 may report its capability on the number of BWPs / CCs in a list BWPs / CCs for simultaneous TCI state update or simultaneous TCI state selection.
[0214] Enhancements on configurations of TCI
[0215] When using DCI format 1_2, TCI field may be with 1, 2, 3 bits, which may be different per BWP / CC, for example, BWP / CC with 1-bit TCI field is the scheduling BWP / CC, and BWP / CC with 3-bit TCI field is the scheduled BWP / CC. In summary, in case of cross frequency resource scheduling, the interpretation of “TCI state field” may be ambiguous.
[0216] According to some embodiments of the present disclosure, this issue may be avoided by reasonable configurations as discussed below.
[0217] As illustrated in FIG. 2, in operation, the network device 120 transmits 210 configuration information to the terminal device 110, where the configuration information comprises at least one of the following: a first bitwidth of TCI state field associated with the first frequency resource and a sconed bitwidth of TCI state field associated with the first frequency resource. The network device 120 may further transmit 220 control information comprising an indicator indicating the second frequency resource to the terminal device 110 on a first frequency resource.
[0218] According to some embodiments of the present discourse, the network device 120 is expected to configure the second bitwidth to be the same as the first bitwidth, or the terminal device 110 expect or assume the second bitwidth is the same as the first bitwidth.
[0219] Additionally, in some embodiments, the first bitwidth or the second bitwidth may be the same as a bitwidth of a reference frequency resource.
[0220] In some embodiments, the reference frequency resource may be one of the following: a frequency resource with a lowest or highest identity, or a frequency resource associated with the maximum bitwidth of TCI state field.
[0221] Merely for better understanding to the above processes, some example embodiments are discussed as below.
[0222] As discussed above, for DCI format 1_2, when the number of bits of TCI field are different per BWP / CC, for example, scheduling BWP / CC with less-bit TCI field cannot point to the beams for the scheduled BWP / CC with more-bit TCI field.
[0223] In some embodiments, in case of cross BWP / CC scheduling, the network device 120 configures TCI field with the same bitwidth for DCI format 1_2, at least for the scheduling BWP / CC and scheduled BWP / CC. Additionally, the configuration is configured based on UE capability on whether UE can support different bitwidth of TCI field in DCI format 1_2 for cross BWP / CC scheduling.
[0224] In some embodiments, in case of cross BWP / CC scheduling, the network configures TCI state field with the same bitwidth as the reference BWP / CC for DCI format 1_2. Additionally, the reference BWP / CC may be defined based on UE capability on whether UE can support reference BWP / CC for determined TCI state field bitwidth for cross BWP / CC scheduling, for example, reference BWP / CC can be the BWP / CC with lowest BWP / CC ID, or the BWP / CC configured with the maximum number of bits of TCI field.
[0225] In this way, the issues on misaligned size of TCI fields when using DCI format 1-2 and cross BWP / CC scheduling may be avoided.
[0226] In some embodiments, the terminal device 110 may be configured with one or multiple lists of BWPs / CCs for simultaneous TCI state update or simultaneous TCI state selection.
[0227] In some embodiments, the first BWP / CC and second BWP / CC may be configured in the same list of BWPs / CCs.
[0228] In some embodiments, for any BWP / CC in the same list, tciSelection-PresentInDCI configuration may be the same.
[0229] In some embodiments, a reference BWP / CC may be the specific BWP / CC (e.g., the first / last, the one with lowest / highest ID) in the same list containing the first BWP / CC and / or second BWP / CC.
[0230] In some embodiments, the terminal device 110 may report its capability on whether supporting the list of BWPs / CCs for simultaneous TCI state update or simultaneous TCI state selection.
[0231] In some embodiments, the terminal device 110 may report its capability on the number of lists of BWPs / CCs for simultaneous TCI state update or simultaneous TCI state selection.
[0232] In some embodiments, the terminal device 110 may report its capability on the number of BWPs / CCs in a list BWPs / CCs for simultaneous TCI state update or simultaneous TCI state selection.
[0233] In some embodiments, for any BWP / CC in the same list, the bitwidth of TCI field in DCI is the same.
[0234] Alternatively, in some embodiments, for any BWP / CC in the same list, when the number of codepoints S in the TCI field in DCI is smaller than the number of TCI codepoints that are activated, only the first S activated codepoints are applied.
[0235] TCI state (s) update
[0236] On unified TCI framework extension for single-DCI based multi-TRP operation, support the followings:
[0237] ● For a serving cell configured with joint DL / UL TCI mode, a full-set or any sub-set of {first joint TCI state, second joint TCI state} can be mapped to a TCI codepoint of the existing TCI field in a DCI format 1_1 / 1_2 by TCI state activation command (MAC-CE) ;
[0238] ● For a serving cell configured with separate DL / UL TCI mode, a full-set or any sub-set of {first DL TCI state, first UL TCI state, second DL TCI state, second UL TCI state} can be mapped to a TCI codepoint of the existing TCI field in a DCI format 1_1 / 1_2 by TCI state activation command (MAC-CE) ;
[0239] ● TCI state activation command (MAC-CE) should indicate that each joint / DL / UL TCI state mapped to a TCI codepoint is the first or second joint / DL / UL TCI state;
[0240] ● The first / second indicated joint / DL / UL TCI state (s) is updated according to the corresponding first / second joint / DL / UL TCI state (s) mapped to the TCI codepoint received by the UE. If the UE receives a TCI codepoint mapped with a sub-set of {first joint TCI state, second joint TCI state} or {first DL TCI state, first UL TCI state, second DL TCI state, second UL TCI state} , the UE shall update the first / second indicated joint / DL / UL TCI state (s) according to the first / second joint / DL / UL TCI state (s) in the subset and apply other indicated first / second joint / DL / UL TCI state (s) that is not updated by the received TCI codepoint.
[0241] As can be seen, a sub-set method to update TCI states requires UE to maintain those TCI states not updated. However, when the UE receives a DCI containing "Bandwidth part indicator" field indicates a bandwidth part other than the active bandwidth part and a TCI codepoint mapped with a sub-set of {first joint TCI state, second joint TCI state} or {first DL TCI state, first UL TCI state, second DL TCI state, second UL TCI state} , the UE cannot maintain TCI states in the scheduling BWP. Further, in case of DCI format 1_2, when the number of bits of TCI field are different per BWP / CC, for example, scheduling BWP / CC with less-bit TCI field cannot point to the beams for the scheduled BWP / CC with more-bit TCI field.
[0242] According to some embodiments of the present disclosure, this issue may be avoided by reasonable configurations as discussed below.
[0243] As illustrated in FIG. 2, in operation, the network device 120 transmits control information to the terminal device 110 to, where the control information comprises an indicator indicating the second frequency resource and a TCI state field.
[0244] According to some embodiments of the present discourse, the network device 120 is expected to configure the TCI state field to be a codepoint mapped with a full-set of TCI states activated for the second frequency resource. Alternatively, or in addition, the terminal device 110 expect or assume the TCI state field corresponds to a codepoint mapped with a full-set of TCI states activated for the second frequency resource.
[0245] Alternatively, regardless of whether the TCI state field corresponds to a codepoint mapped with a full-set of TCI states, the terminal device 110 may well handle the scenario of cross frequency resource scheduling as discussed below.
[0246] In some embodiments, if the TCI state field corresponding to a codepoint mapped with a sub-set of TCI states activated for the second frequency resource, the terminal device 110 updates at least one TCI state in the second frequency resource and applies at least one TCI state not indicated by TCI state field in the first frequency resource, where the at least one TCI state is indicated by the TCI state field.
[0247] Alternatively, in some embodiments, if the TCI state field corresponding to a codepoint mapped with a sub-set of TCI states activated for the second frequency resource, the terminal device 110 updates at least one TCI state in the second frequency resource and applies at least one TCI state not indicated by TCI state field in the second frequency resource, wherein the at least one TCI state is indicated by the TCI state field. Additionally, in some embodiments, the terminal device 110 may apply the at least one TCI state not indicated by the TCI state field in the second frequency resource if a first identity set of a first set of TCI states associated with the first frequency resource is the same as a second identity set of a second set of TCI states associated with the second frequency resource.
[0248] Alternatively, in some embodiments, if the TCI state field corresponding to a codepoint mapped with a sub-set of TCI states activated for the second frequency resource, the terminal device 110 updates at least one TCI state in the second frequency resource and applies at least one TCI state not indicated by TCI state field in a reference frequency resource, wherein the at least one TCI state is indicated by the TCI state field. Additionally, in some embodiments, the terminal device 110 may apply the at least one TCI state not indicated by the TCI state field in the reference frequency resource if a third identity set of a set of TCI states associated with the reference frequency resource is the same as a second identity set of the second set of TCI states associated with the second frequency resource.
[0249] In some embodiments, the reference frequency resource may be one of the following: a frequency resource with a lowest or highest identity, or a frequency resource associated with the maximum bitwidth of TCI state field.
[0250] Merely for better understanding to the above processes, some example embodiments are discussed as below.
[0251] As discussed above, when UE receives a DCI containing "Bandwidth part indicator" field indicates a bandwidth part other than the active bandwidth part and a TCI codepoint mapped with a sub-set of {first joint TCI state, second joint TCI state} or {first DL TCI state, first UL TCI state, second DL TCI state, second UL TCI state} , UE may not be able to maintain TCI states in the scheduling BWP.
[0252] In some embodiments, when UE receives a DCI containing "Bandwidth part indicator" field indicates a bandwidth part other than the active bandwidth part and a TCI field, the TCI codepoint shall (or UE expects that) be mapped with a full-set of {first joint TCI state, second joint TCI state} or {first DL TCI state, first UL TCI state, second DL TCI state, second UL TCI state} , or support common TCI state ID for TCI states used in scheduling BWP and scheduled BWP.
[0253] In this way, issues on UE cannot maintain TCI states in the old BWP after BWP switch may be avoided.
[0254] In some embodiments, in case of cross BWP / CC scheduling, sub-set method is not supported for TCI state update, the network device 120 provides a full-set of {first joint TCI state, second joint TCI state} can be mapped to a TCI codepoint of the TCI field in a DCI format 1_1 / 1_2 by TCI state activation command (MAC-CE) .
[0255] In some embodiments, for a serving cell configured with separate DL / UL TCI mode, the network device 12-provides a full-set of {first DL TCI state, first UL TCI state, second DL TCI state, second UL TCI state} can be mapped to a TCI codepoint of the TCI field in a DCI format 1_1 / 1_2 by TCI state activation command (MAC-CE) .
[0256] In other words, when the terminal device 110receives a DCI containing "Bandwidth part indicator" field indicates a bandwidth part other than the active bandwidth part and a TCI field, the TCI codepoint shall (or UE expects that) be mapped with a full-set of {first joint TCI state, second joint TCI state} or {first DL TCI state, first UL TCI state, second DL TCI state, second UL TCI state} .
[0257] In some embodiments, the terminal device 110 does not expect that the TCI codepoint is mapped with a subset of {first joint TCI state, second joint TCI state} or {first DL TCI state, first UL TCI state, second DL TCI state, second UL TCI state} .
[0258] This restriction may be applied based on UE capability on whether the terminal device 110supports sub-set method for TCI state update for cross BWP / CC scheduling, or, UE capability on whether UE can maintained the TCI states not indicated in the scheduling BWP / CC.
[0259] In some embodiments, common TCI state IDs for TCI states on scheduling and scheduled BWP may be introduced.
[0260] In some embodiments, in case of cross BWP / CC scheduling, when sub-set method is used for TCI state update, the terminal device 110may maintain TCI states in the scheduling BWP / CC.
[0261] In other words, when the terminal device 110receives a DCI containing "Bandwidth part indicator" field indicates a bandwidth part other than the active bandwidth part and a TCI codepoint mapped with a sub-set of {first joint TCI state, second joint TCI state} or {first DL TCI state, first UL TCI state, second DL TCI state, second UL TCI state} , the UE shall update the first / second indicated joint / DL / UL TCI state (s) in the scheduled BWP according to the first / second joint / DL / UL TCI state (s) in the subset and apply other indicated first / second joint / DL / UL TCI state (s) in the scheduling BWP that is not updated by the received TCI codepoint. In some embodiments, these embodiments are performed based on UE capability on whether UE can support to maintain TCI states in scheduling BWP after BWP switch.
[0262] In some embodiments, in case of cross BWP / CC scheduling, when sub-set method is used for TCI state update, the terminal device 110may maintain TCI states in the scheduling BWP / CC, if TCI states sharing the same TCI state IDs in both scheduling and scheduled BWPs. Further, at least other indicated first / second joint / DL / UL TCI state (s) in the scheduling BWP that is not updated by the received TCI codepoint sharing the same TCI state IDs in the scheduled BWP.
[0263] In some embodiments, the terminal device 110 is not required to maintain TCI states in the scheduling BWP, but only to use TCI states in the scheduled BWP with the same TCI state ID.
[0264] In other words, when the terminal device 110receives a DCI containing "Bandwidth part indicator" field indicates a bandwidth part other than the active bandwidth part and a TCI codepoint mapped with a sub-set of {first joint TCI state, second joint TCI state} or {first DL TCI state, first UL TCI state, second DL TCI state, second UL TCI state} , the terminal device 110shall update the first / second indicated joint / DL / UL TCI state (s) in the scheduled BWP according to the first / second joint / DL / UL TCI state (s) in the subset and apply other indicated first / second joint / DL / UL TCI state (s) in the scheduled BWP sharing the same joint / DL / UL TCI state ID (s) in the scheduling BWP that is not updated by the received TCI codepoint.
[0265] In some embodiments, in case of cross BWP / CC scheduling, when sub-set method is used for TCI state update, the terminal device 110may maintain TCI states in the reference BWP / CC.
[0266] In some embodiments, the reference BWP / CC can be defined based on UE capability on whether the terminal device 110can support reference BWP / CC for supporting sub-set method for TCI state update for cross BWP / CC scheduling, for example, reference BWP / CC can be the BWP / CC with lowest BWP / CC ID, or the BWP / CC configured with the common TCI state (s) / TCI state ID (s) .
[0267] In some embodiments, TCI states sharing the same TCI state IDs in both scheduling and scheduled BWPs, as the reference BWP / CC. Further, at least other indicated first / second joint / DL / UL TCI state (s) in the scheduling BWP that is not updated by the received TCI codepoint shares the same TCI state IDs in the reference BWP.
[0268] In some embodiments, the terminal device 110 is not required to maintain TCI states in the scheduling BWP, but only to use TCI states in the reference BWP with the same TCI state ID.
[0269] In other words, when the terminal device 110receives a DCI containing "Bandwidth part indicator" field indicates a bandwidth part other than the active bandwidth part and a TCI codepoint mapped with a sub-set of {first joint TCI state, second joint TCI state} or {first DL TCI state, first UL TCI state, second DL TCI state, second UL TCI state} , the UE shall update the first / second indicated joint / DL / UL TCI state (s) in the reference (or scheduled) BWP according to the first / second joint / DL / UL TCI state (s) in the subset and apply other indicated first / second joint / DL / UL TCI state (s) in the reference (or scheduled) BWP sharing the same joint / DL / UL TCI state ID (s) in the scheduling BWP that is not updated by the received TCI codepoint.
[0270] In some embodiments, the terminal device 110 may be configured with one or multiple lists of BWPs / CCs for simultaneous TCI state update or simultaneous TCI state selection.
[0271] In some embodiments, the first BWP / CC and second BWP / CC may be configured in the same list of BWPs / CCs.
[0272] In some embodiments, for any BWP / CC in the same list, tciSelection-PresentInDCI configuration may be the same.
[0273] In some embodiments, a reference BWP / CC may be the specific BWP / CC (e.g., the first / last, the one with lowest / highest ID) in the same list containing the first BWP / CC and / or second BWP / CC.
[0274] In some embodiments, the terminal device 110 may report its capability on whether supporting the list of BWPs / CCs for simultaneous TCI state update or simultaneous TCI state selection.
[0275] In some embodiments, the terminal device 110 may report its capability on the number of lists of BWPs / CCs for simultaneous TCI state update or simultaneous TCI state selection.
[0276] In some embodiments, the terminal device 110 may report its capability on the number of BWPs / CCs in a list BWPs / CCs for simultaneous TCI state update or simultaneous TCI state selection.
[0277] In some embodiments, the terminal device 110 may report its capability on whether supporting sub-set TCI state update across different BWPs / CCs in the list of BWPs / CCs for simultaneous TCI state update or simultaneous TCI state selection.
[0278] Enhancements on uplink transmissions
[0279] As illustrated in FIG. 2, in operation, the network device 120 transmits 210 configuration information to the terminal device 110, where the configuration information comprises at least one of the following:
[0280] ● at least one first sounding reference signal (SRS) resource set configured for a first frequency resource, or
[0281] ● at least one second SRS resource set configured for a second frequency resource.
[0282] The network device 120 may further transmit 220 control information comprising an indicator indicating the second frequency resource to the terminal device 110 on a first frequency resource.
[0283] In some embodiments, a first bitwidth of SRS resource set indicator associated with the first frequency resource is the same as a second bitwidth of SRS resource set indicator associated with the second frequency resource, which may be configured by the network device 120 or assumed by the terminal device 110.
[0284] Alternatively, in some embodiments, the number of SRS resource sets of the at least one first SRS resource set is the same as a number of SRS resource sets of the at least one second SRS resource set, , which may be configured by the network device 120 or assumed by the terminal device 110.
[0285] As for the terminal device 110, the terminal device may determine one or more second SRS resource set from the at least one second SRS resource set configured for the second frequency resource based on the SRS resource set indicator.
[0286] In some embodiments, if cross BWP / CC scheduling is supported, then for DCI format 0_1, for both scheduling BWP / CC and scheduled BWP / CC, two SRS resource sets are configured respectively by srs-ResourceSetToAddModList and associated with the usage of value ‘nonCodeBook’ or ‘codebook’ , and is not configured with coresetPoolIndex or the value of coresetPoolIndex is the same for all CORESETs if coresetPoolIndex is provided.
[0287] In some embodiments, if cross BWP / CC scheduling is supported, then for DCI format 0_2, for both scheduling BWP / CC and scheduled BWP / CC, two SRS resource sets are configured respectively by srs-ResourceSetToAddModListDCI-0-2 and associated with the usage of value 'nonCodeBook‘ or 'codebook‘ , and is not configured with coresetPoolIndex or the value of coresetPoolIndex is the same for all CORESETs if coresetPoolIndex is provided.
[0288] In other words, when the terminal device 110receives a DCI containing "Bandwidth part indicator" field indicates a bandwidth part other than the active bandwidth part and an SRS resource set indicator, the terminal device 110expects that the bitwidth of the SRS resource set indicator is the same for both BWPs.
[0289] In some embodiments, the terminal device 110 expects / the terminal device 110 is expected to be configured with the same number of SRS resource sets respectively for the scheduling BWP / CC and scheduled BWP / CC, or the terminal device 110 does not expect / UE is not expected to be configured with different number of SRS resource sets respectively for the scheduling BWP / CC and scheduled BWP / CC.
[0290] In some embodiments, when the terminal device 110 receives a DCI containing "Bandwidth part indicator" field indicates a bandwidth part other than the active bandwidth part and an SRS resource set indicator, the SRS resource set indicator provides information on SRS resource set in the scheduled CC / BWP as below table 3.
[0291] Table 3 SRS resource selection
[0292] In some embodiments, the terminal device 110 may be configured with one or multiple lists of BWPs / CCs for simultaneous TCI state update or simultaneous TCI state selection.
[0293] In some embodiments, the first BWP / CC and second BWP / CC may be configured in the same list of BWPs / CCs.
[0294] In some embodiments, for any BWP / CC in the same list, tciSelection-PresentInDCI configuration may be the same.
[0295] In some embodiments, a reference BWP / CC may be the specific BWP / CC (e.g., the first / last, the one with lowest / highest ID) in the same list containing the first BWP / CC and / or second BWP / CC.
[0296] In some embodiments, the terminal device 110 may report its capability on whether supporting the list of BWPs / CCs for simultaneous TCI state update or simultaneous TCI state selection.
[0297] In some embodiments, the terminal device 110 may report its capability on the number of lists of BWPs / CCs for simultaneous TCI state update or simultaneous TCI state selection.
[0298] In some embodiments, the terminal device 110 may report its capability on the number of BWPs / CCs in a list BWPs / CCs for simultaneous TCI state update or simultaneous TCI state selection.
[0299] In some embodiments, the terminal device 110 may be configured with one or multiple lists of BWPs / CCs for simultaneous SRS resource set selection.
[0300] In some embodiments, for any BWP / CC in the same list, the number of SRS resource sets for codebook or noncodebook is the same.
[0301] In some embodiments, for any BWP / CC in the same list, the bitwidth of SRS resource set indictor in DCI is the same.
[0302] Example methods
[0303] FIG. 3 illustrates a flowchart of a communication method 300 implemented at a terminal device in accordance with some embodiments of the present disclosure. For the purpose of discussion, the method 300 will be described from the perspective of the terminal device 110 in FIG. 1.
[0304] At block 310, the terminal device receives, from a network device, configuration information comprising at least one of the following: a first indication indicating whether a transmission configuration indicator (TCI) state selection field is present in control information on a first frequency resource, or a second indication indicating whether a TCI state selection field is present in control information on a second frequency resource different from the first frequency resource.
[0305] At block 320, the terminal device receives, from the network device, control information on a first frequency resource, the control information comprising an indicator indicating the second frequency resource.
[0306] At block 330, the terminal device performs one of the following: communicating with the network device on the second frequency resource by using at least one TCI state, wherein the at least one TCI state is selected from a set of activated TCI states associated with the second frequency resource based at least in part on one of the following: a TCI state selection field comprised in the control information, or a default TCI state selection rule, or ignoring the TCI state selection field comprised in the control information.
[0307] In some example embodiments, the default TCI state selection rule comprises one of the following: applying a first activated TCI state associated with the second frequency resource, applying a second activated TCI state associated with the second frequency resource, or applying both the first and second TCI states.
[0308] In some example embodiments, in accordance with a determination that the terminal device is not configured with the first indication, the terminal device may expect or assume the second indication is not configured for the second frequency resource or all the control-resource sets (CORESETs) in the second frequency resource; in accordance with a determination that the first indication is set to enabled, expect or assume the second indication is set to enabled for the second frequency resource or all the CORESETs in the second frequency resource, or in accordance with a determination that the first indication is set to disabled, expect or assume the second indication is set to disabled for the second frequency resource or all the CORESETs in the second frequency resource.
[0309] In some example embodiments, the set of activated TCI states is one of the following: two TCI states indicated by a TCI state field comprised in the control information, two TCI states activated by a medium access control (MAC) control element, two TCI states configured by a radio resource control (RRC) signalling, or two TCI states configured for a reference frequency resource.
[0310] In some example embodiments, if a number of activated TCI states less than a threshold number, the terminal device may ignore the TCI state selection field or apply the TCI state selection field among a set of TCI states associated with a reference frequency resource.
[0311] In some example embodiments, if the first indication is set to enabled and the second indication is set to disabled or not configured, the terminal device may perform one of the following: applying the default TCI selection rule among a set of activated TCI states associated with the second frequency resource, ignoring the TCI state selection field, assuming the TCI selection filed is set to be a specific codepoint, performing a TCI selection indicated by the TCI state selection filed among a set of activated TCI states associated with the second frequency resource, or applying at least default TCI state in the second frequency resource.
[0312] In some example embodiments, the terminal device may apply the default TCI selection rule if one of the following: the TCI state selection field is absent, the first indication is not configured or set to disabled, and the second indication is not configured or set to disabled; the first indication is set to disabled and the second indication is set to enabled, or the first frequency resource associated with a single-TCI mode, the second frequency resource associated with a multi-TCI mode.
[0313] In some example embodiments, if the first indication is set to enabled and the second frequency resource associated with a single-TCI mode, the terminal device may perform one of the following: ignoring the TCI state selection field, or assuming or expect one TCI state is indicated or selected.
[0314] In some example embodiments, a bitwidth of the TCI state selection field is determined based on a number of TCI state selections.
[0315] In some example embodiments, the terminal device may transmit, to the network device, capability-related information of the terminal device indicating at least one of the following: whether support to be configured with different configurations about whether a field of TCI state selection is present in a control information for different frequency resources; whether support no configuration of about whether a field of TCI state selection is present in a control information if a cross frequency resource scheduling is enabled; whether support a default configuration of TCI selection for a cross frequency resource scheduling; whether support applying the TCI selection field in the scheduling frequency resource for a cross frequency resource scheduling; or whether support a hybrid configuration of single-TCI and multi-TCI in different frequency resources.
[0316] In some example embodiments, the reference frequency resource is one of the following: a frequency resource with a lowest or highest identity, or a frequency resource associated with the maximum bitwidth of TCI state field.
[0317] In some example embodiments, the first and second frequency resources are bandwidth parts, or component carriers.
[0318] FIG. 4 illustrates a flowchart of a communication method 400 implemented at a terminal device in accordance with some embodiments of the present disclosure. For the purpose of discussion, the method 400 will be described from the perspective of the terminal device 110 in FIG. 1.
[0319] At block 410, the terminal device receives, from the network device, configuration information indicating: a first bitwidth of TCI state field associated with the first frequency resource and a sconed bitwidth of TCI state field associated with the first frequency resource, wherein the first bitwidth is the same as the second bitwidth.
[0320] At block 420, the terminal device receives, from the network device on a first frequency resource, control information comprising an indicator indicating the second frequency resource and a TCI state field.
[0321] In some example embodiments, the first bitwidth or the second bitwidth is the same as a bitwidth of a reference frequency resource.
[0322] In some example embodiments, the reference frequency resource is one of the following: a frequency resource with a lowest or highest identity, or a frequency resource associated with the maximum bitwidth of TCI state field.
[0323] In some example embodiments, the first and second frequency resources are bandwidth parts, or component carriers.
[0324] FIG. 5 illustrates a flowchart of a communication method 500 implemented at a terminal device in accordance with some embodiments of the present disclosure. For the purpose of discussion, the method 500 will be described from the perspective of the terminal device 110 in FIG. 1.
[0325] At block 510, the terminal device receives from a network device on a first frequency resource, control information comprising an indicator indicating the second frequency resource and a transmission configuration indicator (TCI) state field.
[0326] At block 520, the terminal device performs one of the following: expecting the TCI state field corresponding to a codepoint mapped with a full-set of TCI states activated for the second frequency resource, in accordance with a determination that the TCI state field corresponding to a codepoint mapped with a sub-set of TCI states activated for the second frequency resource, updating at least one TCI state in the second frequency resource and applying at least one TCI state not indicated by TCI state field in one of the following: the first frequency resource, the second frequency resource or a reference frequency resource, wherein the at least one TCI state is indicated by the TCI state field.
[0327] In some example embodiments, the terminal device may apply the at least one TCI state not indicated by the TCI state field in the second frequency resource if a first identity set of a first set of TCI states associated with the first frequency resource is the same as a second identity set of a second set of TCI states associated with the second frequency resource, and apply the at least one TCI state not indicated by the TCI state field in the reference frequency resource if a third identity set of a set of TCI states associated with the reference frequency resource is the same as a second identity set of the second set of TCI states associated with the second frequency resource.
[0328] In some example embodiments, the reference frequency resource is one of the following: a frequency resource with a lowest or highest identity, or a frequency resource associated with the maximum bitwidth of TCI state field.
[0329] In some example embodiments, the first and second frequency resources are bandwidth parts, or component carriers.
[0330] 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.
[0331] At block 610, the terminal device may receive, from a network device, configuration information comprising at least one of the following: at least one first sounding reference signal (SRS) resource set configured for a first frequency resource, or at least one second SRS resource set configured for a second frequency resource.
[0332] At block 620, the terminal device may receive, from the network device on a first frequency resource, a control information comprising an indicator indicating the second frequency resource and an SRS resource set indicator.
[0333] At block 630, the terminal device may determine, based on the SRS resource set indicator, one or more second SRS resource set from the at least one second SRS resource set configured for the second frequency resource.
[0334] In some example embodiments, a first bitwidth of SRS resource set indicator associated with the first frequency resource is the same as a second bitwidth of SRS resource set indicator associated with the second frequency resource, or a number of SRS resource sets of the at least one first SRS resource set is the same as a number of SRS resource sets of the at least one second SRS resource set.
[0335] In some example embodiments, the first and second frequency resources are bandwidth parts, or component carriers.
[0336] FIG. 7 illustrates a flowchart of a communication method 700 implemented at a network 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 network device 120 in FIG. 1.
[0337] At block 710, the network device transmits, to a terminal device, configuration information comprising at least one of the following: a first indication indicating whether a transmission configuration indicator (TCI) state selection field is present in control information on a first frequency resource, or a second indication indicating whether a TCI state selection field is present in control information on a second frequency resource different from the first frequency resource.
[0338] At block 720, the network device transmits, to the terminal device on a first frequency resource, control information comprising an indicator indicating the second frequency resource, wherein, in accordance with a determination that the terminal device is not configured with the first indication, do not configure the second indication for the second frequency resource or all the control-resource sets (CORESETs) in the second frequency resource; in accordance with a determination that the first indication is set to enabled, set the second indication to be enabled for the second frequency resource or all the CORESETs in the second frequency resource, or in accordance with a determination that the first indication is set to disabled, set the second indication to be disabled for the second frequency resource or all the CORESETs in the second frequency resource.
[0339] In some example embodiments, the configuration information further indicates a default TCI state selection rule comprising one of the following: applying a first activated TCI state associated with the second frequency resource, applying a second activated TCI state associated with the second frequency resource, or applying both the first and second TCI states.
[0340] In some example embodiments, the control information further comprises a TCI state selection field, and a bitwidth of the TCI state selection field is determined based on a number of TCI state selections.
[0341] In some example embodiments, the network device may receive, from the terminal device, capability-related information of the terminal device indicating at least one of the following: whether support to be configured with different configurations about whether a field of TCI state selection is present in a control information for different frequency resources; whether support no configuration of about whether a field of TCI state selection is present in a control information if a cross frequency resource scheduling is enabled; whether support a default configuration of TCI selection for a cross frequency resource scheduling; whether support applying the TCI selection field in the scheduling frequency resource for a cross frequency resource scheduling; whether support a hybrid configuration of single-TCI and multi-TCI in different frequency resources.
[0342] In some example embodiments, the first and second frequency resources are bandwidth parts, or component carriers.
[0343] 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.
[0344] At block 810, the network device may transmit, to a terminal device, configuration information indicating: a first bitwidth of TCI state field associated with the first frequency resource and a sconed bitwidth of TCI state field associated with the first frequency resource, wherein the first bitwidth is the same as the second bitwidth.
[0345] At block 820, the network device may transmit to the terminal device on a first frequency resource, control information comprising an indicator indicating the second frequency resource and a TCI state field.
[0346] In some example embodiments, the first bitwidth or the second bitwidth is the same as a bitwidth of a reference frequency resource.
[0347] In some example embodiments, the reference frequency resource is one of the following: a frequency resource with a lowest or highest identity, or a frequency resource associated with the maximum bitwidth of TCI state field.
[0348] In some example embodiments, the first and second frequency resources are bandwidth parts, or component carriers.
[0349] FIG. 9 illustrates a flowchart of a communication method 900 implemented at a network 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 network device in FIG. 1.
[0350] At block 910, the network device may transmit to a terminal device on a first frequency resource, control information comprising an indicator indicating the second frequency resource and a transmission configuration indicator (TCI) state field, wherein the TCI state field corresponding to a codepoint mapped with a full-set of TCI states activated for the second frequency resource.
[0351] In some example embodiments, the first and second frequency resources are bandwidth parts, or component carriers.
[0352] 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.
[0353] At block 1010, the network device may transmit, to a terminal device, configuration information comprising at least one of the following: at least one first sounding reference signal (SRS) resource set configured for a first frequency resource, or at least one second SRS resource set configured for a second frequency resource.
[0354] At block 1020, the network device may transmit, to the terminal device on a first frequency resource, a control information comprising an indicator indicating the second frequency resource and an SRS resource set indicator, wherein, a first bitwidth of SRS resource set indicator associated with the first frequency resource is the same as a second bitwidth of SRS resource set indicator associated with the second frequency resource, or a number of SRS resource sets of the at least one first SRS resource set is the same as a number of SRS resource sets of the at least one second SRS resource set.
[0355] In some example embodiments, the first and second frequency resources are bandwidth parts, or component carriers.
[0356] Example apparatuses and devices
[0357] 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.
[0358] 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.
[0359] 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.
[0360] 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.
[0361] 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, configuration information comprising at least one of the following: a first indication indicating whether a transmission configuration indicator (TCI) state selection field is present in control information on a first frequency resource, or a second indication indicating whether a TCI state selection field is present in control information on a second frequency resource different from the first frequency resource; receive, from the network device, control information on a first frequency resource, the control information comprising an indicator indicating the second frequency resource; and perform one of the following: communicating with the network device on the second frequency resource by using at least one TCI state, wherein the at least one TCI state is selected from a set of activated TCI states associated with the second frequency resource based at least in part on one of the following: a TCI state selection field comprised in the control information, or a default TCI state selection rule, or ignoring the TCI state selection field comprised in the control information. According to embodiments of the present disclosure, the circuitry may be configured to perform any method implemented by the terminal device as discussed above.
[0362] According to embodiments of the present disclosure, a terminal device comprising a circuitry is provided. The circuitry is configured to: receive, from the network device, configuration information indicating: a first bitwidth of TCI state field associated with the first frequency resource and a sconed bitwidth of TCI state field associated with the first frequency resource, wherein the first bitwidth is the same as the second bitwidth; and receive, from the network device on a first frequency resource, control information comprising an indicator indicating the second frequency resource and a TCI state field. According to embodiments of the present disclosure, the circuitry may be configured to perform any method implemented by the terminal device as discussed above.
[0363] 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 on a first frequency resource, control information comprising an indicator indicating the second frequency resource and a transmission configuration indicator (TCI) state field; and perform one of the following: expecting the TCI state field corresponding to a codepoint mapped with a full-set of TCI states activated for the second frequency resource, in accordance with a determination that the TCI state field corresponding to a codepoint mapped with a sub-set of TCI states activated for the second frequency resource, updating at least one TCI state in the second frequency resource and applying at least one TCI state not indicated by TCI state field in one of the following: the first frequency resource, the second frequency resource or a reference frequency resource, wherein the at least one TCI state is indicated by the TCI state field. According to embodiments of the present disclosure, the circuitry may be configured to perform any method implemented by the terminal device as discussed above.
[0364] 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, configuration information comprising at least one of the following: at least one first sounding reference signal (SRS) resource set configured for a first frequency resource, or at least one second SRS resource set configured for a second frequency resource; receive, from the network device on a first frequency resource, a control information comprising an indicator indicating the second frequency resource and an SRS resource set indicator; and determine, based on the SRS resource set indicator, one or more second SRS resource set from the at least one second SRS resource set configured for the second frequency resource. According to embodiments of the present disclosure, the circuitry may be configured to perform any method implemented by the terminal device as discussed above.
[0365] 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, configuration information comprising at least one of the following: a first indication indicating whether a transmission configuration indicator (TCI) state selection field is present in control information on a first frequency resource, or a second indication indicating whether a TCI state selection field is present in control information on a second frequency resource different from the first frequency resource; transmit, to the terminal device on a first frequency resource, control information comprising an indicator indicating the second frequency resource, wherein, in accordance with a determination that the terminal device is not configured with the first indication, do not configure the second indication for the second frequency resource or all the control-resource sets (CORESETs) in the second frequency resource; in accordance with a determination that the first indication is set to enabled, set the second indication to be enabled for the second frequency resource or all the CORESETs in the second frequency resource, or in accordance with a determination that the first indication is set to disabled, set the second indication to be disabled for the second frequency resource or all the CORESETs in the second frequency resource. According to embodiments of the present disclosure, the circuitry may be configured to perform any method implemented by the network device as discussed above.
[0366] 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, configuration information indicating: a first bitwidth of TCI state field associated with the first frequency resource and a sconed bitwidth of TCI state field associated with the first frequency resource, wherein the first bitwidth is the same as the second bitwidth; and transmit, to the terminal device on a first frequency resource, control information comprising an indicator indicating the second frequency resource and a TCI state field. According to embodiments of the present disclosure, the circuitry may be configured to perform any method implemented by the network device as discussed above.
[0367] 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 on a first frequency resource, control information comprising an indicator indicating the second frequency resource and a transmission configuration indicator (TCI) state field, wherein the TCI state field corresponding to a codepoint mapped with a full-set of TCI states activated for the second frequency resource. According to embodiments of the present disclosure, the circuitry may be configured to perform any method implemented by the network device as discussed above.
[0368] 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, configuration information comprising at least one of the following: at least one first sounding reference signal (SRS) resource set configured for a first frequency resource, or at least one second SRS resource set configured for a second frequency resource; transmit, to the terminal device on a first frequency resource, a control information comprising an indicator indicating the second frequency resource and an SRS resource set indicator, wherein, a first bitwidth of SRS resource set indicator associated with the first frequency resource is the same as a second bitwidth of SRS resource set indicator associated with the second frequency resource, or a number of SRS resource sets of the at least one first SRS resource set is the same as a number of SRS resource sets of the at least one second SRS resource set. According to embodiments of the present disclosure, the circuitry may be configured to perform any method implemented by the network device as discussed above.
[0369] 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.
[0370] According to embodiments of the present disclosure, a terminal apparatus is provided. The terminal apparatus comprises means for receiving, from a network device, configuration information comprising at least one of the following: means for a first indication indicating whether a transmission configuration indicator (TCI) state selection field is present in control information on a first frequency resource, or means for a second indication indicating whether a TCI state selection field is present in control information on a second frequency resource different from the first frequency resource; means for receiving, from the network device, control information on a first frequency resource, the control information comprising an indicator indicating the second frequency resource; and means for performing one of the following: means for communicating with the network device on the second frequency resource by using at least one TCI state, wherein the at least one TCI state is selected from a set of activated TCI states associated with the second frequency resource based at least in part on one of the following: a TCI state selection field comprised in the control information, or a default TCI state selection rule, or means for ignoring the TCI state selection field comprised in the control information. In some embodiments, the first apparatus may comprise means for performing the respective operations of the method 300. In some example embodiments, the first apparatus may further comprise means for performing other operations in some example embodiments of the method 300. The means may be implemented in any suitable form. For example, the means may be implemented in a circuitry or software module.
[0371] According to embodiments of the present disclosure, a terminal apparatus is provided. The terminal apparatus comprises means for receiving, from the network device, configuration information indicating: a first bitwidth of TCI state field associated with the first frequency resource and a sconed bitwidth of TCI state field associated with the first frequency resource, wherein the first bitwidth is the same as the second bitwidth; and means for receiving, from the network device on a first frequency resource, control information comprising an indicator indicating the second frequency resource and a TCI state field. In some embodiments, the second apparatus may comprise means for performing the respective operations of the method 400. In some example embodiments, the second apparatus may further comprise means for performing other operations in some example embodiments of the method 400. The means may be implemented in any suitable form. For example, the means may be implemented in a circuitry or software module.
[0372] According to embodiments of the present disclosure, a terminal apparatus is provided. The terminal apparatus comprises means for receiving, from a network device on a first frequency resource, control information comprising an indicator indicating the second frequency resource and a transmission configuration indicator (TCI) state field; and means for performing one of the following: means for expecting the TCI state field corresponding to a codepoint mapped with a full-set of TCI states activated for the second frequency resource, means for in accordance with a determination that the TCI state field corresponding to a codepoint mapped with a sub-set of TCI states activated for the second frequency resource, updating at least one TCI state in the second frequency resource and applying at least one TCI state not indicated by TCI state field in one of the following: the first frequency resource, the second frequency resource or a reference frequency resource, wherein the at least one TCI state is indicated by the TCI state field. In some embodiments, the third apparatus may comprise means for performing the respective operations of the method 500. In some example embodiments, the third 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.
[0373] According to embodiments of the present disclosure, a terminal apparatus is provided. The terminal apparatus comprises means for receiving, from a network device, configuration information comprising at least one of the following: means for at least one first sounding reference signal (SRS) resource set configured for a first frequency resource, or means for at least one second SRS resource set configured for a second frequency resource; means for receiving, from the network device on a first frequency resource, a control information comprising an indicator indicating the second frequency resource and an SRS resource set indicator; and means for determining, based on the SRS resource set indicator, one or more second SRS resource set from the at least one second SRS resource set configured for the second frequency resource. In some embodiments, the fourth apparatus may comprise means for performing the respective operations of the method 600. In some example embodiments, the fourth 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.
[0374] According to embodiments of the present disclosure, a network apparatus is provided. The network apparatus comprises means for transmitting, to a terminal device, configuration information comprising at least one of the following: a first indication indicating whether a transmission configuration indicator (TCI) state selection field is present in control information on a first frequency resource, or a second indication indicating whether a TCI state selection field is present in control information on a second frequency resource different from the first frequency resource; means for transmitting, to the terminal device on a first frequency resource, control information comprising an indicator indicating the second frequency resource, wherein, means for in accordance with a determination that the terminal device is not configured with the first indication, do not configure the second indication for the second frequency resource or all the control-resource sets (CORESETs) in the second frequency resource; means for in accordance with a determination that the first indication is set to enabled, set the second indication to be enabled for the second frequency resource or all the CORESETs in the second frequency resource, or means for in accordance with a determination that the first indication is set to disabled, set the second indication to be disabled for the second frequency resource or all the CORESETs in the second frequency resource. In some embodiments, the fifth apparatus may comprise means for performing the respective operations of the method 700. In some example embodiments, the fifth 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.
[0375] According to embodiments of the present disclosure, a network apparatus is provided. The network apparatus comprises means for transmitting, to a terminal device, configuration information indicating: a first bitwidth of TCI state field associated with the first frequency resource and a sconed bitwidth of TCI state field associated with the first frequency resource, wherein the first bitwidth is the same as the second bitwidth; and means for transmitting, to the terminal device on a first frequency resource, control information comprising an indicator indicating the second frequency resource and a TCI state field. In some embodiments, the sixth apparatus may comprise means for performing the respective operations of the method 800. In some example embodiments, the sixth 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.
[0376] According to embodiments of the present disclosure, a network apparatus is provided. The network apparatus comprises means for transmitting, to a terminal device on a first frequency resource, control information comprising an indicator indicating the second frequency resource and a transmission configuration indicator (TCI) state field, wherein the TCI state field corresponding to a codepoint mapped with a full-set of TCI states activated for the second frequency resource. In some embodiments, the seventh apparatus may comprise means for performing the respective operations of the method 900. In some example embodiments, the seventh 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.
[0377] According to embodiments of the present disclosure, a network apparatus is provided. The network apparatus comprises means for transmitting, to a terminal device, configuration information comprising at least one of the following: means for at least one first sounding reference signal (SRS) resource set configured for a first frequency resource, or means for at least one second SRS resource set configured for a second frequency resource; means for transmitting, to the terminal device on a first frequency resource, a control information comprising an indicator indicating the second frequency resource and an SRS resource set indicator, wherein, means for a first bitwidth of SRS resource set indicator associated with the first frequency resource is the same as a second bitwidth of SRS resource set indicator associated with the second frequency resource, or means for a number of SRS resource sets of the at least one first SRS resource set is the same as a number of SRS resource sets of the at least one second SRS resource set. In some embodiments, the eighth apparatus may comprise means for performing the respective operations of the method 1000. In some example embodiments, the eighth 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.
[0378] In summary, embodiments of the present disclosure provide the following aspects.
[0379] In an aspect, it is proposed a terminal device comprising: a processor configured to cause the terminal device to: receive, from a network device, configuration information comprising at least one of the following: a first indication indicating whether a transmission configuration indicator (TCI) state selection field is present in control information on a first frequency resource, or a second indication indicating whether a TCI state selection field is present in control information on a second frequency resource different from the first frequency resource; receive, from the network device, control information on a first frequency resource, the control information comprising an indicator indicating the second frequency resource; and perform one of the following: communicating with the network device on the second frequency resource by using at least one TCI state, wherein the at least one TCI state is selected from a set of activated TCI states associated with the second frequency resource based at least in part on one of the following: a TCI state selection field comprised in the control information, or a default TCI state selection rule, or ignoring the TCI state selection field comprised in the control information.
[0380] In some embodiments, the default TCI state selection rule comprises one of the following: applying a first activated TCI state associated with the second frequency resource, applying a second activated TCI state associated with the second frequency resource, or applying both the first and second TCI states.
[0381] In some embodiments, the processor is further configured to cause the terminal device to: in accordance with a determination that the terminal device is not configured with the first indication, expect or assume the second indication is not configured for the second frequency resource or all the control-resource sets (CORESETs) in the second frequency resource; in accordance with a determination that the first indication is set to enabled, expect or assume the second indication is set to enabled for the second frequency resource or all the CORESETs in the second frequency resource, or in accordance with a determination that the first indication is set to disabled, expect or assume the second indication is set to disabled for the second frequency resource or all the CORESETs in the second frequency resource.
[0382] In some embodiments, the set of activated TCI states is one of the following: two TCI states indicated by a TCI state field comprised in the control information, two TCI states activated by a medium access control (MAC) control element, two TCI states configured by a radio resource control (RRC) signalling, or two TCI states configured for a reference frequency resource.
[0383] In some embodiments, the processor is further configured to cause the terminal device to: if a number of activated TCI states less than a threshold number, ignore the TCI state selection field or apply the TCI state selection field among a set of TCI states associated with a reference frequency resource.
[0384] In some embodiments, the processor is further configured to cause the terminal device to: if the first indication is set to enabled and the second indication is set to disabled or not configured, perform one of the following: applying the default TCI selection rule among a set of activated TCI states associated with the second frequency resource, ignoring the TCI state selection field, assuming the TCI selection filed is set to be a specific codepoint, performing a TCI selection indicated by the TCI state selection filed among a set of activated TCI states associated with the second frequency resource, or applying at least default TCI state in the second frequency resource.
[0385] In some embodiments, the processor is further configured to cause the terminal device to: apply the default TCI selection rule if one of the following: the TCI state selection field is absent, the first indication is not configured or set to disabled, and the second indication is not configured or set to disabled; the first indication is set to disabled and the second indication is set to enabled, or the first frequency resource associated with a single-TCI mode, the second frequency resource associated with a multi-TCI mode.
[0386] In some embodiments, the processor is further configured to cause the terminal device to: if the first indication is set to enabled and the second frequency resource associated with a single-TCI mode, perform one of the following: ignoring the TCI state selection field, or assuming or expect one TCI state is indicated or selected.
[0387] In some embodiments, a bitwidth of the TCI state selection field is determined based on a number of TCI state selections.
[0388] In some embodiments, the processor is further configured to cause the terminal device to: transmit, to the network device, capability-related information of the terminal device indicating at least one of the following: whether support to be configured with different configurations about whether a field of TCI state selection is present in a control information for different frequency resources; whether support no configuration of about whether a field of TCI state selection is present in a control information if a cross frequency resource scheduling is enabled; whether support a default configuration of TCI selection for a cross frequency resource scheduling; whether support applying the TCI selection field in the scheduling frequency resource for a cross frequency resource scheduling; or whether support a hybrid configuration of single-TCI and multi-TCI in different frequency resources.
[0389] In some embodiments, the reference frequency resource is one of the following: a frequency resource with a lowest or highest identity, or a frequency resource associated with the maximum bitwidth of TCI state field.
[0390] In some embodiments, the first and second frequency resources are bandwidth parts, or component carriers.
[0391] In an aspect, it is proposed a terminal device comprising: a processor configured to cause the terminal device to: receive, from the network device, configuration information indicating: a first bitwidth of TCI state field associated with the first frequency resource and a sconed bitwidth of TCI state field associated with the first frequency resource, wherein the first bitwidth is the same as the second bitwidth; and receive, from the network device on a first frequency resource, control information comprising an indicator indicating the second frequency resource and a TCI state field.
[0392] In some embodiments, the first bitwidth or the second bitwidth is the same as a bitwidth of a reference frequency resource.
[0393] In some embodiments, the reference frequency resource is one of the following: a frequency resource with a lowest or highest identity, or a frequency resource associated with the maximum bitwidth of TCI state field.
[0394] In some embodiments, the first and second frequency resources are bandwidth parts, or component carriers.
[0395] In an aspect, it is proposed a terminal device comprising: a processor configured to cause the terminal device to: receive, from a network device on a first frequency resource, control information comprising an indicator indicating the second frequency resource and a transmission configuration indicator (TCI) state field; and perform one of the following: expecting the TCI state field corresponding to a codepoint mapped with a full-set of TCI states activated for the second frequency resource, in accordance with a determination that the TCI state field corresponding to a codepoint mapped with a sub-set of TCI states activated for the second frequency resource, updating at least one TCI state in the second frequency resource and applying at least one TCI state not indicated by TCI state field in one of the following: the first frequency resource, the second frequency resource or a reference frequency resource, wherein the at least one TCI state is indicated by the TCI state field.
[0396] In some embodiments, the processor is further configured to cause the terminal device to: apply the at least one TCI state not indicated by the TCI state field in the second frequency resource if a first identity set of a first set of TCI states associated with the first frequency resource is the same as a second identity set of a second set of TCI states associated with the second frequency resource, and apply the at least one TCI state not indicated by the TCI state field in the reference frequency resource if a third identity set of a set of TCI states associated with the reference frequency resource is the same as a second identity set of the second set of TCI states associated with the second frequency resource.
[0397] In some embodiments, the reference frequency resource is one of the following: a frequency resource with a lowest or highest identity, or a frequency resource associated with the maximum bitwidth of TCI state field.
[0398] In some embodiments, the first and second frequency resources are bandwidth parts, or component carriers.
[0399] In an aspect, it is proposed a terminal device comprising: a processor configured to cause the terminal device to: receive, from a network device, configuration information comprising at least one of the following: at least one first sounding reference signal (SRS) resource set configured for a first frequency resource, or at least one second SRS resource set configured for a second frequency resource; receive, from the network device on a first frequency resource, a control information comprising an indicator indicating the second frequency resource and an SRS resource set indicator; and determine, based on the SRS resource set indicator, one or more second SRS resource set from the at least one second SRS resource set configured for the second frequency resource.
[0400] In some embodiments, a first bitwidth of SRS resource set indicator associated with the first frequency resource is the same as a second bitwidth of SRS resource set indicator associated with the second frequency resource, or a number of SRS resource sets of the at least one first SRS resource set is the same as a number of SRS resource sets of the at least one second SRS resource set.
[0401] In some embodiments, the first and second frequency resources are bandwidth parts, or component carriers.
[0402] In an aspect, it is proposed a network device comprising: a processor configured to cause the network device to: transmit, to a terminal device, configuration information comprising at least one of the following: a first indication indicating whether a transmission configuration indicator (TCI) state selection field is present in control information on a first frequency resource, or a second indication indicating whether a TCI state selection field is present in control information on a second frequency resource different from the first frequency resource; transmit, to the terminal device on a first frequency resource, control information comprising an indicator indicating the second frequency resource, wherein, in accordance with a determination that the terminal device is not configured with the first indication, do not configure the second indication for the second frequency resource or all the control-resource sets (CORESETs) in the second frequency resource; in accordance with a determination that the first indication is set to enabled, set the second indication to be enabled for the second frequency resource or all the CORESETs in the second frequency resource, or in accordance with a determination that the first indication is set to disabled, set the second indication to be disabled for the second frequency resource or all the CORESETs in the second frequency resource.
[0403] In some embodiments, the configuration information further indicates a default TCI state selection rule comprising one of the following: applying a first activated TCI state associated with the second frequency resource, applying a second activated TCI state associated with the second frequency resource, or applying both the first and second TCI states.
[0404] In some embodiments, the control information further comprises a TCI state selection field, and a bitwidth of the TCI state selection field is determined based on a number of TCI state selections.
[0405] In some embodiments, the processor is further configured to cause the network device to: receive, from the terminal device, capability-related information of the terminal device indicating at least one of the following: whether support to be configured with different configurations about whether a field of TCI state selection is present in a control information for different frequency resources; whether support no configuration of about whether a field of TCI state selection is present in a control information if a cross frequency resource scheduling is enabled; whether support a default configuration of TCI selection for a cross frequency resource scheduling; whether support applying the TCI selection field in the scheduling frequency resource for a cross frequency resource scheduling; whether support a hybrid configuration of single-TCI and multi-TCI in different frequency resources.
[0406] In some embodiments, the first and second frequency resources are bandwidth parts, or component carriers.
[0407] In an aspect, it is proposed a network device comprising: a processor configured to cause the network device to: transmit, to a terminal device, configuration information indicating: a first bitwidth of TCI state field associated with the first frequency resource and a sconed bitwidth of TCI state field associated with the first frequency resource, wherein the first bitwidth is the same as the second bitwidth; and transmit, to the terminal device on a first frequency resource, control information comprising an indicator indicating the second frequency resource and a TCI state field.
[0408] In some embodiments, the first bitwidth or the second bitwidth is the same as a bitwidth of a reference frequency resource.
[0409] In some embodiments, the reference frequency resource is one of the following: a frequency resource with a lowest or highest identity, or a frequency resource associated with the maximum bitwidth of TCI state field.
[0410] In some embodiments, the first and second frequency resources are bandwidth parts, or component carriers.
[0411] In an aspect, it is proposed a network device comprising: a processor configured to cause the network device to: transmit, to a terminal device on a first frequency resource, control information comprising an indicator indicating the second frequency resource and a transmission configuration indicator (TCI) state field, wherein the TCI state field corresponding to a codepoint mapped with a full-set of TCI states activated for the second frequency resource.
[0412] In some embodiments, the first and second frequency resources are bandwidth parts, or component carriers.
[0413] In an aspect, it is proposed a network device comprising: a processor configured to cause the terminal device to: transmit, to a terminal device, configuration information comprising at least one of the following: at least one first sounding reference signal (SRS) resource set configured for a first frequency resource, or at least one second SRS resource set configured for a second frequency resource; transmit, to the terminal device on a first frequency resource, a control information comprising an indicator indicating the second frequency resource and an SRS resource set indicator, wherein, a first bitwidth of SRS resource set indicator associated with the first frequency resource is the same as a second bitwidth of SRS resource set indicator associated with the second frequency resource, or a number of SRS resource sets of the at least one first SRS resource set is the same as a number of SRS resource sets of the at least one second SRS resource set.
[0414] In some embodiments, the first and second frequency resources are bandwidth parts, or component carriers.
[0415] 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.
[0416] 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.
[0417] 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.
[0418] 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.
[0419] 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.
[0420] 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.
[0421] 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.
[0422] 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.
[0423] 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.
[0424] 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.
[0425] 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.
[0426] 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, configuration information comprising at least one of the following:a first indication indicating whether a transmission configuration indicator (TCI) state selection field is present in control information on a first frequency resource, ora second indication indicating whether a TCI state selection field is present in control information on a second frequency resource different from the first frequency resource;receive, from the network device, control information on a first frequency resource, the control information comprising an indicator indicating the second frequency resource; andperform one of the following:communicating with the network device on the second frequency resource by using at least one TCI state, wherein the at least one TCI state is selected from a set of activated TCI states associated with the second frequency resource based at least in part on one of the following: a TCI state selection field comprised in the control information, or a default TCI state selection rule, orignoring the TCI state selection field comprised in the control information.2.The terminal device of claim 1, wherein the default TCI state selection rule comprises one of the following:applying a first activated TCI state associated with the second frequency resource,applying a second activated TCI state associated with the second frequency resource, orapplying both the first and second TCI states.3.The terminal device of claim 1, wherein the processor is further configured to cause the terminal device to:in accordance with a determination that the terminal device is not configured with the first indication, expect or assume the second indication is not configured for the second frequency resource or all the control-resource sets (CORESETs) in the second frequency resource;in accordance with a determination that the first indication is set to enabled, expect or assume the second indication is set to enabled for the second frequency resource or all the CORESETs in the second frequency resource, orin accordance with a determination that the first indication is set to disabled, expect or assume the second indication is set to disabled for the second frequency resource or all the CORESETs in the second frequency resource.4.The terminal device of claim 1, wherein the set of activated TCI states is one of the following:two TCI states indicated by a TCI state field comprised in the control information,two TCI states activated by a medium access control (MAC) control element,two TCI states configured by a radio resource control (RRC) signalling, ortwo TCI states configured for a reference frequency resource.5.The terminal device of claim 1, wherein the processor is further configured to cause the terminal device to:if a number of activated TCI states less than a threshold number, ignore the TCI state selection field or apply the TCI state selection field among a set of TCI states associated with a reference frequency resource.6.The terminal device of claim 1, wherein the processor is further configured to cause the terminal device to:if the first indication is set to enabled and the second indication is set to disabled or not configured, perform one of the following:applying the default TCI selection rule among a set of activated TCI states associated with the second frequency resource,ignoring the TCI state selection field,assuming the TCI selection filed is set to be a specific codepoint,performing a TCI selection indicated by the TCI state selection filed among a set of activated TCI states associated with the second frequency resource, orapplying at least default TCI state in the second frequency resource.7.The terminal device of claim 1, wherein the processor is further configured to cause the terminal device to:apply the default TCI selection rule if one of the following:the TCI state selection field is absent,the first indication is not configured or set to disabled, and the second indication is not configured or set to disabled;the first indication is set to disabled and the second indication is set to enabled, orthe first frequency resource associated with a single-TCI mode, the second frequency resource associated with a multi-TCI mode.8.The terminal device of claim 1, wherein the processor is further configured to cause the terminal device to:if the first indication is set to enabled and the second frequency resource associated with a single-TCI mode, perform one of the following:ignoring the TCI state selection field, orassuming or expect one TCI state is indicated or selected.9.The terminal device of claim 1, wherein a bitwidth of the TCI state selection field is determined based on a number of TCI state selections.10.The terminal device of claim 1, wherein the processor is further configured to cause the terminal device to:transmit, to the network device, capability-related information of the terminal device indicating at least one of the following:whether support to be configured with different configurations about whether a field of TCI state selection is present in a control information for different frequency resources;whether support no configuration of about whether a field of TCI state selection is present in a control information if a cross frequency resource scheduling is enabled;whether support a default configuration of TCI selection for a cross frequency resource scheduling;whether support applying the TCI selection field in the scheduling frequency resource for a cross frequency resource scheduling; orwhether support a hybrid configuration of single-TCI and multi-TCI in different frequency resources.11.The terminal device of claim 4 or 5, wherein the reference frequency resource is one of the following:a frequency resource with a lowest or highest identity, ora frequency resource associated with the maximum bitwidth of TCI state field.12.The terminal device of any of claims 1 to 11, wherein the first and second frequency resources are bandwidth parts, or component carriers.13.A terminal device comprising:a processor configured to cause the terminal device to:receive, from a network device on a first frequency resource, control information comprising an indicator indicating the second frequency resource and a transmission configuration indicator (TCI) state field; andperform one of the following:expecting the TCI state field corresponding to a codepoint mapped with a full-set of TCI states activated for the second frequency resource,in accordance with a determination that the TCI state field corresponding to a codepoint mapped with a sub-set of TCI states activated for the second frequency resource, updating at least one TCI state in the second frequency resource and applying at least one TCI state not indicated by TCI state field in one of the following: the first frequency resource, the second frequency resource or a reference frequency resource, wherein the at least one TCI state is indicated by the TCI state field.14.The terminal device of claim 13, wherein the processor is further configured to cause the terminal device to:apply the at least one TCI state not indicated by the TCI state field in the second frequency resource if a first identity set of a first set of TCI states associated with the first frequency resource is the same as a second identity set of a second set of TCI states associated with the second frequency resource, andapply the at least one TCI state not indicated by the TCI state field in the reference frequency resource if a third identity set of a set of TCI states associated with the reference frequency resource is the same as a second identity set of the second set of TCI states associated with the second frequency resource.15.The terminal device of claim 13, wherein the reference frequency resource is one of the following:a frequency resource with a lowest or highest identity, ora frequency resource associated with the maximum bitwidth of TCI state field.16.The terminal device of any of claims 13 to 15, wherein the first and second frequency resources are bandwidth parts, or component carriers.17.A terminal device comprising:a processor configured to cause the terminal device to:receive, from a network device, configuration information comprising at least one of the following:at least one first sounding reference signal (SRS) resource set configured for a first frequency resource, orat least one second SRS resource set configured for a second frequency resource;receive, from the network device on a first frequency resource, a control information comprising an indicator indicating the second frequency resource and an SRS resource set indicator; anddetermine, based on the SRS resource set indicator, one or more second SRS resource set from the at least one second SRS resource set configured for the second frequency resource.18.The terminal device of claim 17, wherein,a first bitwidth of SRS resource set indicator associated with the first frequency resource is the same as a second bitwidth of SRS resource set indicator associated with the second frequency resource, ora number of SRS resource sets of the at least one first SRS resource set is the same as a number of SRS resource sets of the at least one second SRS resource set.19.A network device comprising:a processor configured to cause the network device to:transmit, to a terminal device, configuration information comprising at least one of the following:a first indication indicating whether a transmission configuration indicator (TCI) state selection field is present in control information on a first frequency resource, ora second indication indicating whether a TCI state selection field is present in control information on a second frequency resource different from the first frequency resource;transmit, to the terminal device on a first frequency resource, control information comprising an indicator indicating the second frequency resource, wherein,in accordance with a determination that the terminal device is not configured with the first indication, do not configure the second indication for the second frequency resource or all the control-resource sets (CORESETs) in the second frequency resource;in accordance with a determination that the first indication is set to enabled, set the second indication to be enabled for the second frequency resource or all the CORESETs in the second frequency resource, orin accordance with a determination that the first indication is set to disabled, set the second indication to be disabled for the second frequency resource or all the CORESETs in the second frequency resource.20.The network device of claim 19, wherein the configuration information further indicates a default TCI state selection rule comprising one of the following:applying a first activated TCI state associated with the second frequency resource,applying a second activated TCI state associated with the second frequency resource, orapplying both the first and second TCI states.
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