Extensions for multi-transmit / receive point transmission

Abstract

[0003] Embodiments of the present disclosure relate to an enhanced device, method, apparatus, and computer-readable storage medium for m-TRP transmission. The method includes receiving, at a first device from a second device, a first indication of a target type of a multi-transmit / receive point (m-TRP) transmission to be scheduled at a target transmission opportunity and a second indication of at least one TRP associated with the m-TRP transmission; and receiving, at the target transmission opportunity, the m-TRP transmission based at least in part on the first and second indications. In this manner, the UE and the network are aligned with coherent joint transmission (CJT) and non-coherent joint transmission (NCJT) strategies and scheduling information, thereby ensuring that the UE can accurately receive the m-TRP transmission.

Description

[Technical Field]

[0001] FIELD Embodiments of the present disclosure relate generally to the field of telecommunications, and more particularly to a device, method, apparatus, and computer-readable storage medium for enhancements enabling multi-transmit / receive point (m-TRP) transmission. [Background technology]

[0002] With the evolution of Multiple Input Multiple Output (MIMO) technology, networks such as 5G networks support multiple transmit / receive point (m-TRP) transmissions. Typically, m-TRP transmissions are scheduled based on a non-coherent joint transmission (NCJT) strategy. That is, two TRPs may transmit different data streams to a UE in a single transmission opportunity, and the data streams are scheduled by either single downlink control information (S-DCI) or multiple DCI (M-DCI). In some target frequency ranges, such as FR1, NCJT is expected to be implemented with up to four TRPs.

[0003] Furthermore, the network is also expected to support m-TRP transmissions scheduled based on a coherent joint transmission (CJT) strategy with up to four TRPs. In CJT, all TRPs transmit the same data stream on the same radio resource. In this way, the signal-to-interference-and-noise ratio (SINR) and data decoding performance at the UE side are improved. Summary of the Invention [Means for solving the problem]

[0004] Generally, the exemplary embodiments of the present disclosure provide a multi-transmit / receive point transmission solution.

[0005] In a first aspect, a first device is provided, the first device comprising: at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the first device to receive from a second device at least a first indication of a target type of a multi-transmit / receive point (m-TRP) transmission to schedule at a target transmit opportunity and a second indication of at least one TRP associated with the m-TRP transmission, and to receive an m-TRP transmission at the target transmit opportunity based at least in part on the first indication and the second indication.

[0006] In a second aspect, a second device is provided comprising: at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the second device to transmit to the first device at least a first indication of a target type of a multi-transmit / receive point (m-TRP) transmission to be scheduled at a target transmit opportunity and a second indication of at least one TRP associated with the m-TRP transmission.

[0007] In a third aspect, a method is provided that includes receiving, at a first device from a second device, a first indication of a target type of a multi-transmit / receive point (m-TRP) transmission to schedule at a target transmission opportunity and a second indication of at least one TRP associated with the m-TRP transmission, and receiving, at the target transmission opportunity, the m-TRP transmission based at least in part on the first and second indications.

[0008] In a fourth aspect, a method is provided, the method including transmitting, at a second device to a first device, a first indication of a target type of a multi-transmit / receive point (m-TRP) transmission to be scheduled at a target transmission opportunity and a second indication of at least one TRP associated with the m-TRP transmission.

[0009] In a fifth aspect, a first apparatus is provided, the first apparatus comprising: means for receiving from a second apparatus a first indication of a target type of a multi-transmit / receive point (m-TRP) transmission to be scheduled at a target transmission opportunity and a second indication of at least one TRP associated with the m-TRP transmission; and means for receiving the m-TRP transmission at the target transmission opportunity based at least in part on the first indication and the second indication.

[0010] In a sixth aspect, a second apparatus is provided, the second apparatus comprising: means for transmitting to the first apparatus a first indication of a target type of a multi-transmit / receive point (m-TRP) transmission to be scheduled at a target transmission opportunity and a second indication of at least one TRP associated with the m-TRP transmission.

[0011] In a seventh aspect, there is provided a computer readable medium storing a computer program which, when executed by at least one processor of a device, causes the device to perform a method according to the third aspect.

[0012] In an eighth aspect, there is provided a computer readable medium storing a computer program which, when executed by at least one processor of a device, causes the device to perform a method according to the fourth aspect.

[0013] Other features and advantages of the presently disclosed embodiments will become apparent from the following description of specific embodiments, taken in conjunction with the accompanying drawings, which illustrate, by way of example, the principles of the presently disclosed embodiments.

[0014] Embodiments of the present disclosure are presented by way of example, and the advantages thereof will be explained in more detail below with reference to the accompanying drawings. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 1 illustrates an example network system in which exemplary embodiments of the present disclosure may be implemented. [Figure 2] 1 is a signaling chart illustrating an example m-TRP transmission procedure, according to some example embodiments of the present disclosure. [Figure 3] 1 is a schematic diagram of an example media access control (MAC) control element (CE) for m-TRP transmission information, according to some example embodiments of the present disclosure. [Figure 4] FIG. 10 is a schematic diagram of another example MAC CE for m-TRP transmission information, according to some example embodiments of the present disclosure. [Figure 5] 1 is a flowchart of an example method according to some example embodiments of the present disclosure. [Figure 6] 10 is a flowchart of another example method according to some example embodiments of the present disclosure. [Figure 7] FIG. 1 is a schematic block diagram of a device suitable for implementing exemplary embodiments of the present disclosure. [Figure 8] 1 is a block diagram of an exemplary computer-readable medium according to some embodiments of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0016] Throughout the drawings, the same or similar reference numbers refer to the same or similar elements.

[0017] The principles of the present disclosure will now be described with reference to some exemplary embodiments. It should be understood that these embodiments are set forth for illustrative purposes only, to help those skilled in the art understand and implement the present disclosure, without suggesting any limitation on the scope of the present disclosure. The disclosure described herein can be implemented in various ways other than those described below.

[0018] In the following description and claims, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.

[0019] References in this disclosure to "one embodiment," "embodiment," "exemplary embodiment," etc. indicate that the described embodiment may include a particular feature, structure, or characteristic, but do not require that every embodiment include the particular feature, structure, or characteristic. Moreover, such phrases do not necessarily refer to the same embodiment. Furthermore, when a particular feature, structure, or characteristic is described in conjunction with an exemplary embodiment, it is asserted that it is within the knowledge of one of ordinary skill in the art to affect such feature, structure, or characteristic relative to other embodiments, whether or not explicitly described.

[0020] While terms such as "first" and "second" may be used herein to describe various elements, it should be understood that such elements should not be limited by such terms. Such terms are merely used to distinguish the function of the various elements. As used herein, the term "and / or" includes any and all combinations of one or more of the listed terms.

[0021] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit example embodiments. As used herein, the singular forms "a," "an," and "the" are intended to include the plural forms unless the context clearly dictates otherwise. It will be further understood that the terms "comprise," "have," and / or "include," as used herein, specify the presence of stated features, elements, and / or components, etc., but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof.

[0022] As used herein, the term "circuitry" may refer to one or more or all of the following: (a) hardware-only circuit implementations (e.g., implementations using only analog and / or digital circuitry); (b) (where applicable) a combination of hardware circuitry and software such as: (i) a combination of analog and / or digital hardware circuitry and software / firmware; and (ii) any portion of a hardware processor together with software (including digital signal processors, software, and memory that work together to cause a device such as a mobile phone or server to perform various functions); (c) A hardware circuit and / or processor, such as a microprocessor or part of a microprocessor, that requires software (e.g., firmware) for operation, but when software is not required for operation, the software may not be present.

[0023] This definition of circuit applies to all uses of the term in this application, including within any claims. As another example, in this application, the term circuit also encompasses a simple hardware circuit or processor (or processors), or an implementation of a hardware circuit or processor and its associated software and / or firmware portions. The term circuit also encompasses, for example, a baseband or processor integrated circuit for a mobile device, or a similar integrated circuit in a server, cellular network device, or other computing or network device, if applicable to particular claim elements.

[0024] As used herein, the term "communication network" refers to a network conforming to any suitable communication standard, such as a fifth-generation (5G) system, Long Term Evolution (LTE), LTE-Advanced (LTE-A), Wideband Code Division Multiple Access (WCDMA), High-Speed ​​Packet Access (HSPA), or Narrow Band Internet of Things (NB-IoT). Furthermore, communications between terminal devices and network devices within the communication network may be implemented according to any suitable generation of communication protocols, including, but not limited to, first-generation (1G), second-generation (2G), 2.5G, 2.75G, third-generation (3G), fourth-generation (4G), 4.5G, fifth-generation (5G) new radio (NR) communication protocols, and / or any other protocols currently known or developed in the future. Embodiments of the present disclosure may be applied in various communication systems. Given the rapid development of communications, there are naturally future communication technologies and systems in which the present disclosure may be implemented. The scope of the present disclosure should not be understood to be limited solely to the aforementioned systems.

[0025] As used herein, the term "network device" refers to a node in a communication network through which a terminal device accesses and receives services from the network. Depending on the terminology and technology applied, a network device may refer to a base station (BS) or access point (AP), e.g., a Node B (NodeB or NB), an evolved Node B (eNodeB or eNB), an NR Next Generation Node B (gNB), a Remote Radio Unit (RRU), a Radio Header (RH), a Remote Radio Head (RRH), an Integrated Access and Backhaul (IAB) node, a repeater, or a low-power node such as a femto or pico. A network device may be defined as a part of a gNB, e.g., in the case of CU / DU separation, where the network device is defined as either a gNB-CU or a gNB-DU.

[0026] The term "terminal device" refers to any end device that may be capable of wireless communication. By way of example and not limitation, a terminal device may also be referred to as a communication device, user equipment (UE), subscriber station (SS), portable subscriber station, mobile station (MS), or access terminal (AT). Terminal devices may include, but are not limited to, mobile phones, cellular phones, smartphones, voice over IP (VoIP) phones, wireless local loop phones, tablets, wearable terminal devices, personal digital assistants (PDAs), portable computers, desktop computers, image capture terminal devices such as digital cameras, gaming terminal devices, music storage and playback appliances, in-vehicle wireless terminal devices, wireless endpoints, mobile stations, laptop embedded equipment (LEE), laptop mounted equipment (LME), USB dongles, smart devices, wireless customer premises equipment (CPE), Internet of Things (IoT) devices, watches or other wearables, head-mounted displays (HMD), vehicles, drones, medical devices and applications (e.g., remote surgery), industrial devices and applications (e.g., robots and / or other wireless devices operating in industrial and / or automated processing chain contexts), consumer electronics devices, devices operating on commercial and / or industrial wireless networks, etc. Terminal devices may also correspond to the Mobile Termination (MT) portion of an Integrated Access and Backhaul (IAB) node (also called a relay node). In the following description, "terminal device", "communication device", "terminal", "user equipment", and "UE" may be used interchangeably.

[0027] While the functionality described herein may be implemented in fixed and / or wireless network nodes in various exemplary embodiments, in other exemplary embodiments, the functionality may be implemented in a user equipment device (e.g., a cell phone, a tablet computer, a laptop computer, a desktop computer, a mobile IoT device, a fixed IoT device, etc.), which may comprise corresponding functionality, as appropriate, for example, as described in connection with the fixed and / or wireless network nodes. The user equipment device may be user equipment and / or a control device, such as a chipset or processor, configured to control the user equipment when installed within the user equipment. Examples of such functionality include a bootstrapping server function and / or a home subscriber server, which may be implemented within the user equipment device by providing the user equipment device with software configured to cause the user equipment device to perform in terms of such functions / nodes.

[0028] In a communication network, m-TRP transmission based on the NCJT strategy is supported by two TRPs. With the development of m-TRP transmission, it is expected that up to four TRPs will be used to support both NCJT and CJT. Therefore, the network should clearly indicate whether the CJT strategy or the NCJT strategy should be adopted for DL ​​data transmission and reception for any future m-TRP transmission opportunities.

[0029] In the CJT strategy, all related TRPs transmit the same data stream (e.g., a physical downlink shared channel (PDSCH) data stream) on the same radio resource. Because there is no need to distinguish between the data streams, the UE does not need to know from which TRP each PDSCH data stream for the CJT is received. In light of this, the CJT can be considered transparent to the UE. However, before receiving a PDSCH data stream for the CJT, the UE must clearly understand on which radio resource such data stream should be transmitted. Considering that data streams from multiple TRPs use the same radio resource in the CJT, it is clear that one TRP is required to transmit the corresponding physical downlink control channel (PDCCH) to the UE. That is, only S-DCI is adopted for m-TRP transmission based on the CJT strategy.

[0030] In the NCJT strategy, participating TRPs may transmit different data streams to the UE on the same or different radio resources. As mentioned above, m-TRP transmissions based on the NCJT strategy can be scheduled by either S-DCI or M-DCI. Because the UE should distinguish the radio links between the UE and all participating TRPs, the UE needs to be clearly indicated: i) from which TRP or TRPs it will receive DCI for m-TRP transmissions based on the NCJT strategy, and ii) from which TRPs it will receive PDSCH data streams.

[0031] To solve the above and other potential problems, embodiments of the present disclosure provide an efficient and configurable m-TRP transmission mechanism. The proposed mechanism provides DL signaling of m-TRP information necessary to enable m-TRP transmission. Therefore, the m-TRP information is coordinated between the base station and the UE. In the DL signaling, the base station may notify the UE whether to adopt the CJT strategy or the NCJT strategy for any subsequent transmission opportunity. In either strategy, the base station indicates which TRP to receive the PDCCH from for the next data transmission. Furthermore, in the NCJT strategy, the base station notifies the UE which TRP is relevant for a subsequent PDSCH transmission or several subsequent PDSCH transmissions. As a result, CJT and NCJT transmissions are supported, improving UE performance.

[0032] 1 illustrates an example network system 100 in which an example embodiment of the present disclosure may be implemented. As shown in FIG. 1, the communication network 100 may include a first device 110, a second device 120, and TRP1 to TRP4. The first device 110 may be a terminal device (e.g., a UE). The second device 120 and TRP1 to TRP4 may be network devices (e.g., gNBs) that provide service to the first device 110.

[0033] The network system 100 is a MIMO system, and the second device 120 and TRP1 through TRP4 may communicate with the first device 110 based on either a CJT strategy or an NCJT strategy.

[0034] In a CJT strategy, some or all of TRP1 through TRP4 may transmit the same data on the same radio resource (e.g., PDSCH) during a single transmission opportunity. Such CJT transmissions may be scheduled via DCI from one of TRP1 through TRP4.

[0035] In the NCJT strategy, some or all of TRP1 through TRP4 may perform different data transmissions on the same or different radio resources (e.g., PDSCH) during a single transmission opportunity. As discussed above, NCJT transmissions may be scheduled via S-DCI from one of TRP1 through TRP4 or via M-DCI from multiple TRP1 through TRP4.

[0036] In the context of this disclosure, such a data transmission may also be referred to as an m-TRP transmission. One or more of TRP1 through TRP4 that transmit the corresponding DCI(s) for an m-TRP transmission may also be referred to as target TRP(s). Furthermore, some or all of TRP1 through TRP4 involved in an m-TRP transmission may be collectively referred to as a serving cluster of first device 110.

[0037] To enable the CJT and NCJT strategies, the second device 120 may provide necessary information about which m-TRP transmissions to schedule at any subsequent transmission opportunity. Such information may indicate at least one of the following: - the target type of m-TRP transmission, e.g., whether CJT or NCJT transmission should be scheduled; - in the case where a CJT transmission should be scheduled, which TRP should send DCI for m-TRP transmission; - In the case where an NCJT transmission should be scheduled, which of the S-DCI or M-DCI and the corresponding TRP(s) should be employed for the NCJT transmission, which TRP(s) should transmit the m-TRP transmission, etc.

[0038] In the context of this disclosure, target types of m-TRP transmission include, but are not limited to, m-TRP transmission based on a CJT strategy (sometimes referred to as CJT transmission), m-TRP transmission based on an NCJT strategy (sometimes referred to as NCJT transmission), or other transmissions including multiple TRPs based on either existing or future strategies.

[0039] In some exemplary embodiments, such information is included within a MAC CE, which may be a MAC CE dedicated to m-TRP transmission or a MAC CE for activation / deactivation of transmission configuration indicator (TCI) state.

[0040] Although second device 120 is shown separately from TRP1 through TRP4, in some alternative embodiments, second device 120 may be one of TRP1 through TRP4. In other words, the network device providing the m-TRP information may or may not be one of the TRPs sending the m-TRP transmission.

[0041] 1 does not imply any limitation, but is given for illustrative purposes. In practice, communications network 100 may include any suitable number of terminal devices, network devices, TRPs, etc.

[0042] Depending on the communication technology, communication network 100 may be a Code Division Multiple Access (CDMA) network, a Time Division Multiple Address (TDMA) network, a Frequency Division Multiple Access (FDMA) network, an Orthogonal Frequency-Division Multiple Access (OFDMA) network, a Single Carrier-Frequency Division Multiple Access (SC-FDMA) network, or any other. Communications discussed in network 100 may conform to any suitable standard, including, but not limited to, New Radio Access (NR), Long Term Evolution (LTE), LTE-Evolution, LTE Advanced (LTE-A), Wideband Code Division Multiple Access (WCDMA), Code Division Multiple Access (CDMA), cdma2000, and Global System for Mobile Communications (GSM). Furthermore, communications may be implemented according to any generation of communication protocols now known or developed in the future. Examples of communication protocols include, but are not limited to, first generation (1G), second generation (2G), 2.5G, 2.75G, third generation (3G), fourth generation (4G), 4.5G, and fifth generation (5G) communication protocols. The techniques described herein may be used for the aforementioned wireless networks and radio technologies, as well as other wireless networks and radio technologies. For clarity, some aspects of the technology are described below with respect to LTE, and LTE terminology is used in much of the description below.

[0043] The principles and implementations of the present disclosure are described in detail below with reference to Figures 2 through 6. Figure 2 shows a signaling chart illustrating an example m-TRP transmission procedure 200 according to some embodiments of the present disclosure. Process 200 may involve first device 110, second device 120, and TRP1 through TRP4, as shown in Figure 1. For discussion purposes, process 200 will be described with reference to Figure 1.

[0044] In process 200, first device 110 is served by at least some of TRP1 through TRP4. Specifically, first device 110 may receive m-TRP transmissions from at least some of TRP1 through TRP4 based on either a CJT strategy or an NCJT strategy. In the following description, at least one of TRP1 through TRP4 that transmits DCI for the m-TRP transmission may be referred to as a target TRP 230, and some or all of TRP1 through TRP4 that transmit m-TRP transmissions may be collectively referred to as a serving cluster 240.

[0045] It should be understood that in some embodiments, the target TRP 230 may be one of the serving clusters 240, and in some other embodiments, the target TRP 230 may be separate from the serving cluster 240.

[0046] The second device 120 transmits to the first device 110 a first indication of a target type of m-TRP transmission to be scheduled at the target transmission opportunity and a second indication of at least one TRP associated with the m-TRP transmission (205). For example, the target type may be one of CJT or NCJT. Furthermore, the first device 110 may determine how to interpret the second indication based on the value of the first indication.

[0047] In some exemplary embodiments, the first device 110 may determine 210 the target TRP 230 based on the value of the second indication. Additionally or alternatively, in some exemplary embodiments, a third indication may be transmitted to the first device 110. Accordingly, the first device 110 may determine 215 the serving cluster 240 based on the value of the third indication. In some exemplary embodiments, the first device 110 may receive 220 the DCI from the target TRP 230.

[0048] In some exemplary embodiments, the first and second instructions may be included in a MAC CE dedicated to m-TRP transmission. For example, the Layer 2 MAC CE may be designed to coordinate m-TRP information (e.g., the first and second instructions) between the first device 110 and the second device 120.

[0049] 3 shows a schematic diagram of an example MAC CE 300 for m-TRP transmission information according to some embodiments of the present disclosure. As shown in FIG. 3, the MAC CE 300 consists of two bytes, the first byte is a MAC CE subheader, and the second byte is a MAC CE payload. Specifically, the MAC CE subheader consists of three parts: an R bit 302 reserved for other uses, a CJT / NCJT indication 304, and a logical channel identification (LCID) field 306. As an example, the R 302 bit may be 1 bit, the CJT / NCJT indication 304 may be 1 bit, and the LCID field 306 may be 6 bits.

[0050] The CJT / NCJT indication 304 may be used for a first indication and may indicate a subsequent m-TRP transmission or several subsequent m-TRP transmissions to be scheduled based on a CJT strategy or an NCJT strategy. As an example, a first value (e.g., 1) of the CJT / NCJT indication 304 may indicate a CJT transmission, and a second value (e.g., 0) of the CJT / NCJT indication 304 may indicate an NCJT transmission, or vice versa. The LCID field may indicate that this MAC CE is dedicated to providing m-TRP information. For this purpose, a dedicated LCID may be assigned to distinguish this new MAC CE.

[0051] Additionally, the first device 110 may determine how to interpret the payload portion based on the value of the CJT / NCJT indication. In some exemplary embodiments, the MAC CE payload may include a PDCCH indication and a PDSCH indication. The PDCCH indication may include four bits, indicated by 312 through 318, that are used for the second indication and are mapped to corresponding ones of TRP1 through TRP4, respectively.

[0052] Specifically, the PDCCH indication may indicate from which one or more of the target TRPs 230, i.e., TRP1 to TRP4, to receive DCI for m-TRP transmission. In the case where a CJT transmission is to be scheduled, the PDCCH indication may indicate only one TRP from which to transmit DCI.

[0053] In the case where an NCJT transmission is to be scheduled, four bits in the PDCCH indication may implicitly indicate whether the first device 110 should employ S-DCI or M-DCI and the corresponding one or more TRPs from which to transmit the DCI. If only one TRP is indicated in the PDCCH indication, the first device 110 may determine that the m-TRP transmission is scheduled based on the S-DCI scheme, and the indicated TRP is the target TRP 230 from which to transmit the S-DCI. If multiple TRPs are indicated in the PDCCH indication, the first device 110 may determine that the m-TRP transmission is scheduled based on the M-DCI scheme, and the first device 110 may attempt to receive DCI from each of the indicated TRPs.

[0054] The PDSCH indication may include four bits, designated 320 through 326, used for the third indication and mapped to corresponding ones of TRP1 through TRP4, respectively. In the case where the incoming m-TRP transmission is a CJT transmission, the first device 110 may ignore the PDSCH indication. This is because the first device 110 does not need to know which TRP transmits the CJT transmission. Therefore, in this case, four bits in the PDSCH indication may be reserved for future use. In the case where the incoming m-TRP transmission is an NCJT transmission, the four-bit PDSCH indication is set to indicate from which TRP to receive the NCJT transmission.

[0055] The number of bits in the PDCCH and PDSCH indications may correspond to the number of TRPs in the serving cluster 240, one bit per TRP. In some exemplary embodiments, the four bits in each of the PDCCH and PDSCH fields may be ordered based on a TRP ID or any other predefined principle. In this manner, the first device 110 and the second device 120 are aligned on the mapping between the bits in the PDCCH and PDSCH indications and the four TRPs configured for m-TRP transmission. Of course, in cases where fewer than four TRPs are associated with the serving cluster 240, the first device 110 may only need to decode a portion of the four-bit field and ignore the remaining bits.

[0056] Additionally or alternatively, in some exemplary embodiments, the first and second indications may be included in a MAC CE of a transmission configuration indicator (TCI) state activation / deactivation. In other words, an existing MAC CE may be reused to indicate m-TRP information.

[0057] The TCI status activation / deactivation MAC CE can be used for m-TRP transmission because it can indicate the TCI status of multiple serving cells. Here, multiple serving cells may refer to multiple serving TRPs. When a MAC CE is used for multiple serving cell or multiple TRP situations, two information elements (IEs), namely, CORESET Pool ID and Bandwidth Part (BWP) ID, are kept unused. Therefore, when this MAC CE is reused for m-TRP situations, these two IEs can be considered for other uses.

[0058] 4 is a schematic diagram of another example MAC CE 400 for m-TRP transmission information according to some embodiments of the present disclosure. As shown in FIG. 4, the MAC CE 400 may be composed of N Octs, where Oct 1 includes fields for a 1-bit CORESET Pool ID 402, a 2-bit BWP ID 404, and a serving cell ID 406, and Octs 2 through N indicate the TCI status of multiple serving cells.

[0059] CORESET Pool ID 402 may be used for a first indication that a subsequent m-TRP transmission or several subsequent m-TRP transmissions should be scheduled based on a CJT strategy or an NCJT strategy. As an example, a first value (e.g., 1) of CORESET Pool ID 402 may indicate a CJT transmission, and a second value (e.g., 0) of CORESET Pool ID 402 may indicate an NCJT transmission, or vice versa.

[0060] Furthermore, the first device 110 may determine how to interpret the BWP ID 404 based on the value of the CORESET Pool ID 402. In some exemplary embodiments, if the value of the CORESET Pool ID 402 indicates that a CJT transmission should be scheduled, the BWP ID 404 may indicate the target TRP 230, i.e., from which TRP to receive DCI for the CJT transmission. An exemplary coding scheme for the BWP ID is shown in Table 1 below.

[0061] [Table 1]

[0062] In the example of Table 1, a value of "00" for BWP ID 404 indicates that TRP1 transmits DCI for CJT transmission, a value of "01" for BWP ID 404 indicates that TRP2 transmits DCI for CJT transmission, a value of "10" for BWP ID 404 indicates that TRP3 transmits DCI for CJT transmission, and a value of "11" for BWP ID 404 indicates that TRP4 transmits DCI for CJT transmission. In this case, the first device 110 may only attempt to receive PDCCH transmission from the indicated TRP and does not check PDCCHs from other TRPs.

[0063] In some exemplary embodiments, if the value of CORESET Pool ID 402 indicates that an NCJT transmission should be scheduled, BWP ID 404 may indicate from which TRP to receive the NCJT transmission. Furthermore, in this case, an RRC message may indicate whether S-DCI or M-DCI should be employed for the NCJT transmission. An exemplary coding scheme for BWP ID is shown in Table 2 below.

[0064] [Table 2]

[0065] In the example of Table 2, a BWP ID 404 value of "00" indicates that the first TRP (i.e., TRP1) of the serving cluster 240 transmits an NCJT transmission, a BWP ID 404 value of "01" indicates that the first two TRPs (i.e., TRP1 and TRP2) of the serving cluster 240 transmit an NCJT transmission, a BWP ID 404 value of "10" indicates that the first three TRPs (i.e., TRP1, TRP2, and TRP3) of the serving cluster 240 transmit an NCJT transmission, and a BWP ID 404 value of "11" indicates that all TRPs of the serving cluster 240 transmit an NCJT transmission.

[0066] Additionally or alternatively, in the example of Table 2, the four TRPs, TRP1 to TRP4, are ordered according to a predefined rule. As an example, according to the predefined rule, TRP1 to TRP4 may be ordered based on descending order of the large-scale information for TRP1 to TRP4. In this case, the second device 120 may always schedule the TRP with the larger information for DL ​​transmission. Therefore, two bits are sufficient to indicate four statuses. For example, if the second device 120 schedules one TRP to serve the first device 110, which is indicated by BWP ID=00, the first device 110 may recognize that TRP1, which has the largest status, is scheduled. If the second device 120 schedules three TRPs to serve the first device 110, which is indicated by BWP ID=10, the first device 110 may recognize that TRP1, TRP2, and TRP3 are selected for NCJT transmission.

[0067] In a case where the second device 120 expects to schedule TRP1, TRP3, and TRP4 to serve the first device 110, the second device 120 may schedule TRP1, TRP2, TRP3, and TRP4 to serve the first device 110, which covers the original intention of the second device 120 to schedule TRP1, TRP3, and TRP4.

[0068] It should be understood that the BWP ID values ​​in Tables 1 and 2 are given for illustrative purposes and any other values ​​are possible for implementation of the present disclosure.

[0069] Returning to FIG. 2, the first device 110 receives an m-TRP transmission based at least in part on the first instruction and the second instruction at the targeted transmission opportunity (225).

[0070] It should be understood that some of the steps in process 200 are optional and may be omitted, and the order of the steps is given for illustrative purposes. For example, in the case of CJT transmission, step 215 may be omitted. Accordingly, embodiments of the present disclosure are not limited in this respect.

[0071] According to an exemplary embodiment of the present disclosure, m-TRP information for enabling CJT transmission and NCJT transmission is aligned on the UE side and the network side, so that the UE can properly receive the m-TRP transmission and network performance can be improved.

[0072] 5 shows a flowchart of an example method 500 according to some embodiments of the present disclosure. Method 500 may be implemented in a terminal device, such as first device 110 described with reference to FIG. 1. For purposes of discussion, method 500 will be described with reference to FIG. 1.

[0073] At 510, the first device 110 receives from the second device 120 a first indication of a target type of m-TRP transmission to be scheduled at the target transmission opportunity and a second indication of at least one TRP associated with the m-TRP transmission. The target type of the m-TRP transmission may include one of a CJT or NCJT type of m-TRP transmission.

[0074] At 520, the first device 110 receives an m-TRP transmission based at least in part on the first instruction and the second instruction at the target transmission opportunity.

[0075] In some exemplary embodiments, the first device 110 may receive an m-TRP transmission from at least one TRP indicated by the second instruction according to the target type indicated by the first instruction.

[0076] In some exemplary embodiments, the first indication may be included in a subheader of a MAC CE for m-TRP transmission, and the subheader of the MAC CE may further include an LCID corresponding to the m-TRP transmission. Furthermore, the second indication may be included in a payload of the MAC CE and may indicate at least one first TRP that transmits at least one DCI for the m-TRP transmission. For example, a Layer 2 MAC CE may be designed to carry the first and second indications for m-TRP transmission.

[0077] In some exemplary embodiments, the value of the first indication may indicate whether the target type is CJT or NCJT. If the first indication is set to a first value indicating CJT, the first device 110 may determine a first TRP based on the value of the second indication. The first device 110 may receive DCI for the CJT from the first TRP. Accordingly, the first device 110 may then receive multiple data transmissions corresponding to the CJT from a group of second TRPs based on the DCI. In the context of the present disclosure, the term “first TRP” may refer to a TRP(s) transmitting DCI for the m-TRP transmission, and the term “group of second TRPs” may refer to multiple TRPs of a serving cluster transmitting m-TRP transmissions.

[0078] In some exemplary embodiments, the payload of the MAC CE may further include a third indication of a group of second TRPs to send the m-TRP transmission. In such embodiments, if the first indication is set to a second value indicating an NCJT, the first device 110 may determine at least one first TRP based on the value of the second indication and may determine a group of second TRPs based on the value of the third indication. The first device 110 may then receive at least one DCI for the NCJT from the at least one first TRP. Thus, the first device 110 may receive multiple data transmissions corresponding to the NCJT from the group of second TRPs based on the at least one DCI.

[0079] In some exemplary embodiments, the value of the second indication may implicitly indicate whether to employ S-DCI or M-DCI. Specifically, if the value of the second indication indicates a single first TRP, the first device 110 may determine m-TRP transmissions to schedule by a single DCI. Otherwise, if the value of the second indication indicates multiple first TRPs, the first device 110 may determine m-TRP transmissions to schedule by multiple DCIs.

[0080] In some exemplary embodiments, the first indication may be included in a field of a CORESET pool identification of a MAC CE for the TCI state, and the second indication may be included in a field of a bandwidth portion identification of the MAC CE. For example, a MAC CE of an Activation / Deactivation CE of the TCI state may be reused for the first indication and the second indication. By reusing an existing MAC CE to indicate m-TRP information (e.g., the first indication and the second indication), DL signaling overhead may be reduced.

[0081] In some exemplary embodiments in which the first and second indications are included in the MAC CE for the TCI state, if the first indication is set to a first value indicating the CJT, the first device 110 may determine a first TRP from which to transmit DCI for the CJT based on the value of the second indication. The first device 110 may then receive the DCI from the first TRP. Thus, the first device 110 may receive multiple data transmissions corresponding to the CJT from a group of second TRPs based on the DCI.

[0082] Alternatively or additionally, in some exemplary embodiments, if the first indication is set to a second value indicating an NCJT, the first device 110 may determine at least one of a group of second TRPs from which to transmit an m-TRP transmission based on the value of the second indication. The first device 110 may receive an RRC message from the second device 120 indicating at least one first TRP transmitting at least one DCI for the NCJT. The first device 110 may then receive at least one DCI from the at least one first TRP. Thus, the first device 110 may receive multiple data transmissions corresponding to the NCJT from at least one of the group of second TRPs based on the at least one DCI.

[0083] In some exemplary embodiments, the RRC message may indicate the NCJT to be scheduled by a single DCI or multiple DCIs.

[0084] In some exemplary embodiments, the bandwidth portion identification field includes two bits, where a first value of the bandwidth portion identification indicates a first one of the group of second TRPs transmitting the m-TRP transmission, a second value of the bandwidth portion identification indicates a first two of the group of second TRPs transmitting the m-TRP transmission, a third value of the bandwidth portion identification indicates a first three of the group of second TRPs transmitting the m-TRP transmission, and a fourth value of the bandwidth portion identification indicates a group of second TRPs transmitting the m-TRP transmission, and the order of the groups of second TRPs is based on a predefined rule associated with the groups of second TRPs.

[0085] In some exemplary embodiments, the first device 110 and the second device 120 may recognize a predefined rule. As an example, according to the predefined rule, the order of the group of second TRPs may be determined based on a descending order of the large-scale information for the group of second TRPs.

[0086] In some exemplary embodiments, first device 110 may comprise a terminal device and second device 120 may comprise a network device.

[0087] According to an exemplary embodiment, an m-TRP transmission mechanism is provided, in which the CJT / NCJT strategy and m-TRP information are aligned on the UE side and the base station side. In this way, the UE can properly receive the m-TRP transmission, and network performance can be improved.

[0088] 6 shows a flowchart of an example method 600 according to some example embodiments of the present disclosure. Method 600 may be implemented in a network, for example, second device 120 described with reference to FIG. 1. For purposes of discussion, method 600 will be described with reference to FIG.

[0089] At 610, the second device 120 transmits to the first device 110 a first indication of a target type of m-TRP transmission to be scheduled at the target transmission opportunity and a second indication of at least one TRP associated with the m-TRP transmission.

[0090] In some exemplary embodiments, the first indication may be included in a subheader of a MAC CE for the m-TRP transmission, and the subheader of the MAC CE may further include an LCID corresponding to the m-TRP transmission. Furthermore, the second indication may be included in the payload of the MAC CE. For example, a Layer 2 MAC CE may be designed to carry the first indication and the second indication for the m-TRP transmission.

[0091] In some exemplary embodiments, if the target type is a CJT setting, the second device 120 may set the first instruction to a first value indicating the CJT. The second device 120 may set the second instruction to a value indicating a first TRP to transmit DCI for m-TRP transmission. Thus, the second device 120 may transmit a MAC CE including the first instruction and the second instruction to the first device 110.

[0092] In some exemplary embodiments, the payload of the MAC CE may further include a third instruction. If the target type is NCJT, the second device 120 may set the first instruction to a second value indicating NCJT. The second device 120 may set the second instruction to a value indicating at least one first TRP transmitting at least one DCI for m-TRP transmission. The second device 120 may set the third instruction to a value indicating a group of second TRPs transmitting m-TRP transmission. Thus, the second device 120 may transmit a MAC CE including the first instruction, the second instruction, and the third instruction to the first device 110.

[0093] In some exemplary embodiments, the first indication may be included in a field for CORESET pool identification of the MAC CE for the TCI state, and the second indication may be included in a field for bandwidth portion identification of the MAC CE. For example, a MAC CE of the TCI state Activation / Deactivation CE may be reused for the first indication and the second indication. By reusing an existing MAC CE to indicate m-TRP information (e.g., the first indication and the second indication), DL signaling overhead may be reduced.

[0094] In some exemplary embodiments, if the target type is CJT, the second device 120 may set the first indication to a first value indicating CJT. The second device 120 may set the second indication to a value indicating a first TRP transmitting DCI for m-TRP transmission. Thus, the second device 120 may transmit a MAC CE for the TCI state including the first indication and the second indication to the first device 110.

[0095] Additionally or alternatively, in some exemplary embodiments, if the target type is NCJT, the second device 120 may set the first indication to a second value indicating NCJT. The second device 120 may set the second indication to a value indicating a second group of TRPs for which to send the m-TRP transmission. Thus, the second device 120 may transmit a MAC CE for the TCI state to the first device 110 that includes the first indication and the second indication.

[0096] In some exemplary embodiments, the second device 120 may transmit an RRC message to the first device 110 indicating at least one first TRP that transmits at least one DCI for the NCJT.

[0097] In some exemplary embodiments, the bandwidth portion identification field includes two bits, where a first value of the bandwidth portion identification indicates a first one of the group of second TRPs transmitting the m-TRP transmission, a second value of the bandwidth portion identification indicates a first two of the group of second TRPs transmitting the m-TRP transmission, a third value of the bandwidth portion identification indicates a first three of the group of second TRPs transmitting the m-TRP transmission, and a fourth value of the bandwidth portion identification indicates a group of second TRPs transmitting the m-TRP transmission, and the order of the groups of second TRPs is based on a predefined rule associated with the groups of second TRPs.

[0098] In some exemplary embodiments, the first device 110 and the second device 120 may recognize a predefined rule. As an example, according to the predefined rule, the order of the group of second TRPs may be determined based on a descending order of the large-scale information for the group of second TRPs.

[0099] In some exemplary embodiments, the first device 110 may comprise a terminal device and the second device 120 may comprise a network device.

[0100] According to an embodiment of the present disclosure, a base station is enabled to indicate, via extended DL signaling, whether to adopt a CJT strategy or an NCJT strategy for m-TRP transmission. Furthermore, the base station may inform the UE from which TRP to receive DCI for CJT / NCJT transmission. For NCJT, the base station may further inform the UE from which one or more TRPs to receive NCJT transmission. In this way, m-TRP information is aligned on the UE side and the network side. Therefore, network performance may be improved.

[0101] In some exemplary embodiments, a first apparatus (e.g., first device 110) capable of performing method 500 may comprise means for performing each step of method 500. The means may be implemented in any suitable form. For example, the means may be implemented in a circuit or a software module. In some embodiments, the means may comprise at least one processor and at least one memory containing computer program code. The at least one memory and the computer program code, in conjunction with the at least one processor, are configured to cause operations on the first apparatus.

[0102] In some exemplary embodiments, the first device comprises means for receiving from the second device a first indication of a target type of a multi-transmit / receive point (m-TRP) transmission to be scheduled at the target transmission opportunity and a second indication of at least one TRP associated with the m-TRP transmission, and means for receiving the m-TRP transmission at the target transmission opportunity based at least in part on the first indication and the second indication.

[0103] In some exemplary embodiments, the means for receiving a multi-transmit / receive point transmission comprises means for receiving a multi-transmit / receive point transmission from at least one multi-transmit / receive point indicated by a second indication according to a target type indicated by the first indication.

[0104] In some exemplary embodiments, the first indication is included in a subheader of a media access control control element for a multi-transmit / receive point transmission, the subheader of the media access control control element further including a logical channel identification corresponding to the multi-transmit / receive point transmission, and the second indication is included in a payload of the media access control control element and indicates at least one first transmit / receive point that is to transmit at least one downlink control information for the multi-transmit / receive point transmission.

[0105] In some exemplary embodiments, the means for receiving a multi-transmit / receive point transmission comprises means for determining a first transmitting / receiving point based on a value of a second indication in accordance with a determination that the first indication is set to a first value indicating a coherent joint transmission; means for receiving downlink control information for the coherent joint transmission from the first transmitting / receiving point; and means for receiving a plurality of data transmissions corresponding to the coherent joint transmission from a group of second transmitting / receiving points based on the downlink control information.

[0106] In some exemplary embodiments, the payload of the media access control element further includes a third indication of a second group of transmitting and receiving points transmitting the multi-transmitting / receiving point transmission. The means for receiving the multi-transmitting / receiving point transmission comprises, in accordance with a determination that the first indication is set to a second value indicating a non-coherent joint transmission, means for determining the at least one first transmitting / receiving point based on a value of the second indication and determining the second group of transmitting / receiving points based on a value of the third indication, means for receiving at least one downlink control information for the non-coherent joint transmission from the at least one first transmitting / receiving point, and means for receiving a plurality of data transmissions corresponding to the non-coherent joint transmission from the second group of transmitting / receiving points based on the at least one downlink control information.

[0107] In some exemplary embodiments, the first apparatus further comprises means for determining, in accordance with a determination that the value of the second indication indicates a single first transmission / reception point, a multi-transmission / reception point transmission to be scheduled by a single downlink control information, and means for determining, in accordance with a determination that the value of the second indication indicates a plurality of first transmission / reception points, a multi-transmission / reception point transmission to be scheduled by a plurality of downlink control information.

[0108] In some exemplary embodiments, the first indication is included in a field for a CORESET pool identification of a media access control control element for a transmission configuration indicator state, and the second indication is included in a field for a bandwidth portion identification of the media access control control element.

[0109] In some exemplary embodiments, the means for receiving a multi-transmit / receive point transmission comprises: means for determining a first transmitting / receiving point that transmits downlink control information for the coherent joint transmission based on a value of the second indication in accordance with a determination that the first indication is set to a first value indicating a coherent joint transmission; means for receiving the downlink control information from the first transmitting / receiving point; and means for receiving a plurality of data transmissions corresponding to the coherent joint transmission from a group of second transmitting / receiving points based on the downlink control information.

[0110] In some exemplary embodiments, the means for receiving a multi-transmission / reception point transmission comprises: according to a determination that the first indication is set to a second value indicating a non-coherent joint transmission, means for determining at least one of a group of second transmission / reception points to transmit the multi-transmission / reception point transmission based on a value of the second indication; means for receiving from the second device a radio resource control message indicating at least one first transmission / reception point to transmit at least one downlink control information for the non-coherent joint transmission; means for receiving at least one downlink control information from the at least one first transmission / reception point; and means for receiving a plurality of data transmissions corresponding to the non-coherent joint transmission from at least one of the group of second transmission / reception points based on the at least one downlink control information.

[0111] In some exemplary embodiments, the radio resource control message indicates a non-coherent joint transmission to be scheduled by a single downlink control information or by multiple downlink control information.

[0112] In some exemplary embodiments, the bandwidth portion identification field includes two bits, wherein a first value of the bandwidth portion identification indicates a first one of the group of second transmission / reception points transmitting the multi-transmission / reception point transmission, a second value of the bandwidth portion identification indicates a first two of the group of second transmission / reception points transmitting the multi-transmission / reception point transmission, a third value of the bandwidth portion identification indicates a first three of the group of second transmission / reception points transmitting the multi-transmission / reception point transmission, and a fourth value of the bandwidth portion identification indicates a group of second transmission / reception points transmitting the multi-transmission / reception point transmission, and the ordering of the groups of second transmission / reception points is based on a predefined rule associated with the groups of second transmission / reception points.

[0113] In some exemplary embodiments, the first device comprises a terminal device and the second device comprises a network device.

[0114] In some exemplary embodiments, a second apparatus (e.g., second device 120) capable of performing method 600 may comprise means for performing each step of method 600. The means may be implemented in any suitable form. For example, the means may be implemented by a circuit or a software module. In some embodiments, the means may comprise at least one processor and at least one memory containing computer program code. The at least one memory and the computer program code are configured, in conjunction with the at least one processor, to cause an operation on the second apparatus.

[0115] In some exemplary embodiments, the second device comprises means for transmitting to the first device a first indication of a target type of a multi-transmit / receive point (m-TRP) transmission to be scheduled at the target transmission opportunity, and a second indication of at least one TRP associated with the m-TRP transmission.

[0116] In some exemplary embodiments, the first instruction is included in a subheader of a media access control control element for a multi-transmit / receive point transmission, the subheader of the media access control control element further including a logical channel identification corresponding to the multi-transmit / receive point transmission, and the second instruction is included in a payload of the media access control control element.

[0117] In some exemplary embodiments, the means for transmitting the first instruction and the second instruction comprises: means for setting the first instruction to a first value indicating a coherent joint transmission according to a determination that the target type is a coherent joint transmission; means for setting the second instruction to a value indicating a first transmitting / receiving point transmitting downlink control information for a multi-transmit / receive point transmission; and means for transmitting a media access control element including the first instruction and the second instruction to the first device.

[0118] In some exemplary embodiments, the payload of the media access control control element further includes a third instruction. The means for transmitting the first instruction and the second instruction comprises: means for setting the first instruction to a second value indicating a non-coherent joint transmission in accordance with determining that the target type is a non-coherent joint transmission; means for setting the second instruction to a value indicating at least one first transmission / reception point transmitting at least one downlink control information for a multi-transmission / reception point transmission; means for setting the third instruction to a value indicating a group of second transmission / reception points transmitting the multi-transmission / reception point transmission; and means for transmitting a media access control element including the first instruction, the second instruction, and the third instruction to the first device.

[0119] In some exemplary embodiments, the first indication is included in a field for a CORESET pool identification of a media access control control element for a transmission configuration indicator state, and the second indication is included in a field for a bandwidth portion identification of the media access control control element.

[0120] In some exemplary embodiments, the means for transmitting the first instruction and the second instruction comprises: means for setting the first instruction to a first value indicating a coherent joint transmission according to a determination that the target type is a coherent joint transmission; means for setting the second instruction to a value indicating a first transmitting / receiving point transmitting downlink control information for a multi-transmit / receive point transmission; and means for transmitting a media access control control element for a transmission setting indicator status including the first instruction and the second instruction to the first device.

[0121] In some exemplary embodiments, the means for transmitting the first instruction and the second instruction comprises: means for setting the first instruction to a second value indicating a non-coherent joint transmission according to a determination that the target type is a non-coherent joint transmission; means for setting the second instruction to a value indicating a group of second transmitting / receiving points transmitting the multi-transmitting / receiving point transmission; and means for transmitting a media access control control element for a transmission setting indicator status including the first instruction and the second instruction to the first device.

[0122] In some exemplary embodiments, the second apparatus further comprises means for transmitting a radio resource control message to the first apparatus indicating at least one first transmitting / receiving point that transmits at least one downlink control information for the non-coherent joint transmission.

[0123] In some exemplary embodiments, the bandwidth portion identification field includes two bits, wherein a first value of the bandwidth portion identification indicates a first one of the group of second transmission / reception points transmitting the multi-transmission / reception point transmission, a second value of the bandwidth portion identification indicates a first two of the group of second transmission / reception points transmitting the multi-transmission / reception point transmission, a third value of the bandwidth portion identification indicates a first three of the group of second transmission / reception points transmitting the multi-transmission / reception point transmission, and a fourth value of the bandwidth portion identification indicates a group of second transmission / reception points transmitting the multi-transmission / reception point transmission, and the ordering of the groups of second transmission / reception points is based on a predefined rule associated with the groups of second transmission / reception points.

[0124] In some exemplary embodiments, the first device comprises a terminal device and the second device comprises a network device.

[0125] 7 is a schematic block diagram of a device 700 suitable for implementing embodiments of the present disclosure. The device 700 may be provided to implement a communications device, such as the first device 110 or the second device 120 as shown in FIG. 1. As shown, the device 700 includes one or more processors 710, one or more memories 720 coupled to the processors 710, and one or more transmitters and / or receivers (TX / RX) 740 (i.e., communications modules 740) coupled to the processors 710.

[0126] The TX / RX 740 is for bidirectional communication. The TX / RX 740 includes at least one antenna to facilitate communication. The communication interface may represent any interface necessary for communication with other network elements.

[0127] The processor 710 may be of any type suitable for the local technical network and may comprise one or more of the following: as non-limiting examples, a general-purpose computer, a special-purpose computer, a microprocessor, a digital signal processor (DSP), and a processor based on a multi-core processor architecture. The device 700 may comprise multiple processors, such as application-specific integrated circuit chips time-slaved to a clock synchronized with a main processor.

[0128] The memory 720 may comprise one or more non-volatile memories and one or more volatile memories. Examples of non-volatile memory include, but are not limited to, read-only memory (ROM) 724, electrically programmable read-only memory (EPROM), flash memory, hard disks, compact disks (CDs), digital video disks (DVDs), and other magnetic and / or optical storage. Examples of volatile memory include, but are not limited to, random access memory (RAM) 722 and other volatile memory that is not retained during power-down periods.

[0129] The computer program 730 includes computer-executable instructions that are executed by the associated processor 710. The program 730 may be stored in the ROM 724. The processor 710 may perform any suitable operations and processes by loading the program 730 into the RAM 722.

[0130] The embodiments of the present disclosure may be implemented by a program 730 such that the device 700 may execute any of the processes of the present disclosure discussed with reference to Figures 2-6. The embodiments of the present disclosure may also be implemented by hardware or a combination of software and hardware.

[0131] In some embodiments, the program 730 may be tangibly contained in a computer-readable medium that may be included in the device 700 (such as memory 720) or in other storage device accessible by the device 700. The device 700 may load the program 730 from the computer-readable medium into RAM 722 for execution. The computer-readable medium may include any type of tangible non-volatile storage, such as ROM, EPROM, flash memory, hard disk, CD, DVD, etc. Figure 8 shows an example of a computer-readable medium 800 in the form of a CD or DVD. The computer-readable medium stores the program 730.

[0132] In general, 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 by hardware, while other aspects may be implemented by firmware or software that may be executed by a controller, microprocessor, or other computing device. While various aspects of the embodiments of the present disclosure are illustrated and described as block diagrams, flowcharts, or using some other pictorial representations, it should be understood that the blocks, devices, systems, techniques, or methods described herein may be implemented in, by way of non-limiting example, hardware, software, firmware, special-purpose circuits or logic, general-purpose hardware or controller, or other computing device, or some combination thereof.

[0133] 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 contained in program modules, executing on a target real or virtual processor in a device to implement the method 500 or method 600 described above with reference to FIGS. 5-6. Generally, program modules include routines, programs, libraries, objects, classes, components, data structures, etc. that perform particular tasks and implement particular abstract data types. The functionality of the program modules may be combined or divided among program modules as desired in various embodiments. The machine-executable instructions for the program modules may be executed in a local or distributed device. In a distributed device, the program modules may be located in both local and remote storage media.

[0134] Program code for carrying out the methods of the present disclosure may be written in any combination of one or more programming languages. Such program code may be provided to a processor or controller of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when executed by the processor or controller, the program code causes the processor or controller to perform the functions / operations specified in the flowcharts and / or block diagrams. The program code may run entirely on the machine, partially on the machine as a stand-alone software package, partially on the machine and partially on a remote machine, or entirely on a remote machine or server.

[0135] In the context of the present disclosure, computer program code or associated data may be carried by any suitable carrier to enable a device, device, or processor to perform the various processes and operations as described above. Examples of carriers include signals, computer-readable media, etc.

[0136] The computer-readable medium may be a computer-readable signal medium or a computer-readable storage medium. The computer-readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or device, or any suitable combination of the above. More specific examples of the computer-readable storage medium 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 above.

[0137] Furthermore, although operations are shown in a particular order, this should not be understood as requiring such operations to be performed in the particular order shown, or in any sequential order, or that all of the operations shown be performed, to achieve desirable results. In some environments, multitasking and parallel processing may be advantageous. Similarly, while some specific implementation details are included in the above discussion, these should not be construed as limitations on the scope of the disclosure, but rather as descriptions of features that may be specific to particular embodiments. Some features that are described in the context of separate embodiments can also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment can also be implemented in multiple embodiments separately or in any suitable subcombination.

[0138] 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, as defined by 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 first device, at least one processor; at least one memory storing instructions that, when executed by the at least one processor, cause the first device to: receiving from a second device a first indication of a target type of multi-transmit / receive point transmission to be scheduled at the target transmit opportunity and a second indication of at least one transmit / receive point associated with the multi-transmit / receive point transmission; at least one memory for receiving a multi-transmit / receive point transmission based at least in part on the first indication and the second indication at the target transmit opportunity; a first device comprising:

2. At least one memory stores instructions that, when executed by the at least one processor, cause the first device to:

2. The first device of claim 1, wherein the first device receives a multi-transmit / receive point transmission from at least one multi-transmit / receive point indicated by a second indication according to a target type indicated by a first indication.

3. 2. The first device of claim 1, wherein the first indication is included in a subheader of a media access control element for a multi-transmit / receive point transmission, the subheader of the media access control element further including a logical channel identification corresponding to the multi-transmit / receive point transmission, and the second indication is included in a payload of the media access control element and indicates at least one first transmit / receive point that transmits at least one downlink control information for the multi-transmit / receive point transmission.

4. At least one memory stores instructions that, when executed by the at least one processor, cause the first device to: determining a first transmission / reception point based on a value of the second indication according to a determination that the first indication is set to a first value indicating coherent joint transmission; receiving downlink control information for coherent joint transmission from a first transmitting / receiving point; receiving, based on the downlink control information, a plurality of data transmissions corresponding to the coherent joint transmissions from a second group of transmitting and receiving points; 4. The first device of claim 3, wherein the first device receives a multi-transmit / receive point transmission by:

5. the payload of the media access control control element further includes a third indication of a group of second transmitting / receiving points that transmit the multi-transmitting / receiving point transmission; At least one memory stores instructions that, when executed by the at least one processor, cause the first device to: According to a determination that the first indication is set to a second value indicating non-coherent joint transmission, determining at least one first transmitting / receiving point based on the value of the second indication, and determining a group of second transmitting / receiving points based on the value of the third indication; receiving at least one downlink control information for non-coherent joint transmission from at least one first transmitting / receiving point; receiving, based on the at least one downlink control information, a plurality of data transmissions corresponding to the non-coherent joint transmissions from a second group of transmitting and receiving points; 4. The first device of claim 3, wherein the first device receives a multi-transmit / receive point transmission by:

6. At least one memory stores instructions that, when executed by the at least one processor, cause the first device to further: determining a multi-transmit / receive point transmission to be scheduled by the single downlink control information in accordance with determining that the value of the second indication indicates the single first transmit / receive point; The first device of claim 5 , further comprising: causing a plurality of downlink control information to determine a multi-transmit / receive point transmission to be scheduled according to determining that the value of the second indication indicates a plurality of first transmit / receive points.

7. 2. The first device of claim 1, wherein the first indication is included in a field for a CORESET pool identification of a media access control control element for a transmission configuration indicator state, and the second indication is included in a field for a bandwidth portion identification of the media access control control element.

8. At least one memory stores instructions that, when executed by the at least one processor, cause the first device to: According to the determination that the first indication is set to a first value indicating the coherent joint transmission, determining a first transmitting / receiving point to transmit downlink control information for the coherent joint transmission based on the value of the second indication; receiving downlink control information from a first transmission / reception point; receiving, based on the downlink control information, a plurality of data transmissions corresponding to the coherent joint transmissions from a second group of transmitting and receiving points; 8. The first device of claim 7, wherein the first device receives a multi-transmit / receive point transmission by:

9. At least one memory stores instructions that, when executed by the at least one processor, cause the first device to: In accordance with determining that the first indication is set to a second value indicating a non-coherent joint transmission, determining at least one of a second group of transmitting / receiving points to transmit a multi-transmit / receive point transmission based on the value of the second indication; receiving a radio resource control message from a second device indicating at least one first transmitting / receiving point transmitting at least one downlink control information for non-coherent joint transmission; receiving at least one downlink control information from at least one first transmission / reception point; receiving, based on the at least one downlink control information, a plurality of data transmissions corresponding to the non-coherent joint transmissions from at least one of the second group of transmitting and receiving points; 8. The first device of claim 7, wherein the first device receives a multi-transmit / receive point transmission by:

10. The first device of claim 9 , wherein the radio resource control message indicates a non-coherent joint transmission to be scheduled by a single downlink control information or a plurality of downlink control information.

11. 10. The first device of claim 9, wherein the field of bandwidth portion identification comprises two bits, a first value of the bandwidth portion identification indicating a first one of the group of second transmission / reception points transmitting the multi-transmission / reception point transmission, a second value of the bandwidth portion identification indicating a first two of the group of second transmission / reception points transmitting the multi-transmission / reception point transmission, a third value of the bandwidth portion identification indicating a first three of the group of second transmission / reception points transmitting the multi-transmission / reception point transmission, and a fourth value of the bandwidth portion identification indicating a group of second transmission / reception points transmitting the multi-transmission / reception point transmission, and wherein an order of the groups of second transmission / reception points is based on a predefined rule associated with the groups of second transmission / reception points.

12. The first device of claim 1 , wherein the first device comprises a terminal device and the second device comprises a network device.

13. a second device, at least one processor; at least one memory storing instructions that, when executed by the at least one processor, cause the second device to: at least one memory that causes the first device to transmit a first indication of a target type of multi-transmit / receive point transmission to be scheduled at the target transmit opportunity and a second indication of at least one transmit / receive point associated with the multi-transmit / receive point transmission; a second device comprising:

14. 14. The second device of claim 13, wherein the first indication is included in a subheader of a media access control element for a multi-transmit / receive point transmission, the subheader of the media access control element further including a logical channel identification corresponding to the multi-transmit / receive point transmission, and the second indication is included in a payload of the media access control element.

15. At least one memory stores instructions that, when executed by the at least one processor, cause the second device to: setting a first indication to a first value indicating coherent joint transmission according to determining that the target type is coherent joint transmission; setting the second indication to a value indicative of a first transmitting / receiving point transmitting downlink control information for a multi-transmitting / receiving point transmission; transmitting a media access control element including the first instruction and the second instruction to the first device; The second device of claim 14 , wherein the second device causes the first instruction and the second instruction to be transmitted by

16. the payload of the media access control element further includes a third instruction; At least one memory stores instructions that, when executed by the at least one processor, cause the second device to: setting the first indication to a second value indicating non-coherent joint transmission according to determining that the target type is non-coherent joint transmission; setting the second indication to a value indicative of the at least one first transmitting / receiving point transmitting the at least one downlink control information for the multi-transmitting / receiving point transmission; setting the third indication to a value indicative of a group of second transmitting and receiving points transmitting the multi-transmitting and receiving point transmission; transmitting a media access control element to the first device, the media access control element including the first instruction, the second instruction, and the third instruction; The second device of claim 14 , wherein the first instruction and the second instruction are transmitted by

17. 14. The second device of claim 13, wherein the first indication is included in a field for a CORESET pool identification of a media access control control element for a transmission configuration indicator state, and the second indication is included in a field for a bandwidth portion identification of the media access control control element.

18. At least one memory stores instructions that, when executed by the at least one processor, cause the second device to: setting a first indication to a first value indicating coherent joint transmission according to determining that the target type is coherent joint transmission; setting the second indication to a value indicative of a first transmitting / receiving point transmitting downlink control information for a multi-transmitting / receiving point transmission; transmitting a media access control element for a transmission configuration indicator state including the first indication and the second indication to the first device; 18. The second device of claim 17, wherein the second device causes the first instruction and the second instruction to be transmitted by

19. At least one memory stores instructions that, when executed by the at least one processor, cause the second device to: setting the first indication to a second value indicating non-coherent joint transmission according to determining that the target type is non-coherent joint transmission; setting the second indication to a value indicative of a second group of transmitting and receiving points transmitting the multi-transmitting and receiving point transmission; transmitting a media access control element for a transmission configuration indicator state including the first indication and the second indication to the first device; 18. The second device of claim 17, wherein the second device causes the first instruction and the second instruction to be transmitted by

20. At least one memory stores instructions that, when executed by the at least one processor, cause the second device to further:

20. The second device of claim 19, further comprising: causing the first device to transmit a radio resource control message indicating at least one first transmitting / receiving point that transmits at least one downlink control information for non-coherent joint transmission.

21. 20. The second device of claim 19, wherein the field of bandwidth portion identification comprises two bits, a first value of the bandwidth portion identification indicating a first one of the group of second transmission / reception points transmitting the multi-transmission / reception point transmission, a second value of the bandwidth portion identification indicating a first two of the group of second transmission / reception points transmitting the multi-transmission / reception point transmission, a third value of the bandwidth portion identification indicating a first three of the group of second transmission / reception points transmitting the multi-transmission / reception point transmission, and a fourth value of the bandwidth portion identification indicating a group of second transmission / reception points transmitting the multi-transmission / reception point transmission, and wherein an order of the groups of second transmission / reception points is based on a predefined rule associated with the groups of second transmission / reception points.

22. The second device of claim 13 , wherein the first device comprises a terminal device and the second device comprises a network device.

23. 1. A method comprising: receiving, at the first device, from a second device, a first indication of a target type of multi-transmit / receive point transmission to be scheduled at the target transmit opportunity and a second indication of at least one transmit / receive point associated with the multi-transmit / receive point transmission; receiving a multi-transmit / receive point transmission based at least in part on the first indication and the second indication at the target transmit opportunity; A method comprising:

24. 1. A method comprising: transmitting, from the second device to the first device, a first indication of a target type of multi-transmit / receive point transmission to be scheduled at the target transmit opportunity and a second indication of at least one transmit / receive point associated with the multi-transmit / receive point transmission; A method comprising:

25. 1. A first device, comprising: means for receiving from a second device a first indication of a target type of multi-transmit / receive point transmission to be scheduled at the target transmit opportunity and a second indication of at least one transmit / receive point associated with the multi-transmit / receive point transmission; means for receiving a multi-transmit / receive point transmission based at least in part on the first indication and the second indication at the target transmit opportunity; A first device comprising:

26. a second device, means for transmitting to the first device a first indication of a target type of multi-transmit / receive point transmission to be scheduled at the target transmit opportunity and a second indication of at least one transmit / receive point associated with the multi-transmit / receive point transmission; A second device comprising:

27. A computer readable medium containing program instructions for causing an apparatus to perform the method of claim 23 or 24.

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