Apparatus, method and computer program

Abstract

An apparatus is provided that is configured to receive, from at least one access node, a first spatial relationship indication for a first transmission to be made in a first direction; receive, from the at least one access node, a second spatial relationship indication for a second transmission to be made in a second direction; receive, from the at least one access node, a third indication indicating whether the second spatial relationship indication should be used for a limited duration; and use the received indications to receive and / or transmit signaling with the at least one access node.

Description

[Technical field]

[0001] The present disclosure relates to an apparatus, a method and a computer program, particularly, but not exclusively, for network devices. [Background technology]

[0002] A communication system may be considered as a facility that enables a communication session between two or more entities, such as user terminals, access nodes, and / or other nodes, by providing carriers between the various entities involved in the communication path. A communication system may be provided, for example, by using a communication network and one or more suitable communication devices. A communication session may include, for example, communication of data to carry communication such as voice, electronic mail (email), text messages, multimedia and / or content data. Content may be multicast or unicast to the communication devices.

[0003] A user may access a communication system by using an appropriate communication device or terminal. A user's communication device is often referred to as User Equipment (UE) or user device. A communication device may access a carrier provided by an access node and transmit and / or receive communications on the carrier.

[0004] A communication system and associated devices typically operate according to required standards or specifications that specify what the various entities associated with the system are permitted to do and how that should be accomplished. Typically, communication protocols and / or parameters that should be used for the connection are also defined. An example of a communication system is UTRAN (3G Radio). Another example of a known architecture is the Long Term Evolution (LTE) or Universal Mobile Telecommunications System (UMTS) radio access technology. Another exemplary communication system is the so-called 5G system that allows user equipment (UE) or user device to contact the 5G core via, for example, New Radio (NR) access technology or via other access technologies such as untrusted access to 5GC or wireline access technology. Summary of the Invention

[0005] According to a first aspect, there is provided an apparatus for a terminal, the apparatus comprising: means for receiving, from at least one access node, a first spatial relationship indication for a first transmission to be in a first direction; means for receiving, from the at least one access node, a second spatial relationship indication for a second transmission to be in a second direction; means for receiving, from the at least one access node, a third indication indicating whether the second spatial relationship indication should be used for a limited duration or not; and means for using the received indications to receive and / or transmit signaling with the at least one access node.

[0006] The apparatus can include means for determining an auxiliary spatial relationship for at least one transmission in a second direction, and means for using the determined auxiliary spatial relationship for the at least one transmission after using the second spatial relationship.

[0007] The apparatus may comprise means for receiving, from the at least one access node, a fourth indication indicating whether the second spatial relationship indication should be applied to transmissions made in the second direction on resources that are part of the same resource group as resources on which the second transmission is made.

[0008] The apparatus can comprise means for receiving a fifth indication from the at least one access node, the fifth indication indicating a third spatial relationship indication to be used for a third transmission in the second direction.

[0009] When the third indication indicates that the second spatial relationship indication should be used for a limited duration, the apparatus may comprise means for receiving a sixth indication indicating a number of transmissions to be made using the second spatial relationship indication and / or the first spatial relationship indication, wherein the means for using the received indication includes using the second spatial relationship indication and / or the first spatial relationship indication for the limited duration.

[0010] When the third indication indicates that the second spatial relationship indication should be used for a limited duration, the apparatus may comprise means for receiving a sixth indication indicating a duration for using the second spatial relationship indication and / or the first spatial relationship indication, wherein the means for using the received indication includes using the second spatial relationship indication and / or the first spatial relationship indication for the limited duration.

[0011] The second indication may indicate that the first spatial relationship indication should also be used for transmission in a second direction.

[0012] The third indication may further indicate whether the first spatial relationship indication should be used for a limited duration.

[0013] When the third indication indicates that the second spatial relationship indication is to be used for a limited duration, the apparatus can comprise means for using a fourth spatial relationship for transmission in the second direction after expiration of the limited duration, the fourth spatial relationship also being used for transmission occurring in the second direction before the second spatial relationship was used.

[0014] The first instruction and the second instruction may be represented by a single code point.

[0015] The first instruction and the second instruction may be represented by respective code points.

[0016] According to a second aspect, there is provided an apparatus for an access node, comprising: means for transmitting to a terminal a first spatial relationship indication for a first transmission to be in a first direction; means for transmitting to the terminal a second spatial relationship indication for a second transmission to be in a second direction; means for transmitting to the terminal a third indication indicating whether the second spatial relationship indication should be used for a limited duration; and means for using the transmitted indications to receive and / or transmit signaling with the terminal.

[0017] The apparatus can include means for determining an auxiliary spatial relationship for at least one transmission in a second direction, and means for using the determined auxiliary spatial relationship for the at least one transmission after using the second spatial relationship.

[0018] The apparatus may comprise means for transmitting, from the at least one access node, a fourth indication indicating whether the second spatial relationship indication should be applied to transmissions made in the second direction on resources that are part of the same resource group as resources on which the second transmission is made.

[0019] The apparatus can comprise means for transmitting, to the terminal, a fifth indication indicating a third spatial relationship to be used for a third transmission in the second direction.

[0020] When the third indication indicates that the second spatial relationship indication should be used for a limited duration, the apparatus may comprise means for transmitting a sixth indication indicating a number of transmissions to be made using the second spatial relationship indication and / or the first spatial relationship indication, wherein the means for using the received indication includes using the second spatial relationship indication and / or the first spatial relationship indication for the limited duration.

[0021] When the third indication indicates that the second spatial relationship indication should be used for a limited duration, the apparatus may comprise means for transmitting a sixth indication indicating a duration for using the second spatial relationship indication and / or the first spatial relationship indication, wherein the means for using the received indication includes using the second spatial relationship indication and / or the first spatial relationship indication for the limited duration.

[0022] The second indication may indicate that the first spatial relationship indication should also be used for transmission in a second direction.

[0023] The third indication may further indicate whether the first spatial relationship indication should be used for a limited duration.

[0024] When the third indication indicates that the second spatial relationship indication is to be used for a limited duration, the apparatus can comprise means for using a fourth spatial relationship for transmission in the second direction after expiration of the limited duration, the fourth spatial relationship also being used for transmission occurring in the second direction before the second spatial relationship was used.

[0025] The first instruction and the second instruction may be represented by a single code point.

[0026] The first instruction and the second instruction may be represented by respective code points.

[0027] According to a third aspect, there is provided a method for an apparatus for a terminal, the method including receiving, from at least one access node, a first spatial relationship indication for a first transmission to be made in a first direction, receiving, from the at least one access node, a second spatial relationship indication for a second transmission to be made in a second direction, receiving, from the at least one access node, a third indication indicating whether the second spatial relationship indication should be used for a limited duration, and using the received indications to receive and / or transmit signaling with the at least one access node.

[0028] The method may include determining an auxiliary spatial relationship for at least one transmission in a second direction, and using the determined auxiliary spatial relationship for the at least one transmission after using the second spatial relationship.

[0029] The method may include receiving a fourth indication from the at least one access node indicating whether the second spatial relationship indication should apply to transmissions made in the second direction on resources that are part of the same resource group as resources on which the second transmission is made.

[0030] The method can include receiving a fifth indication from the at least one access node, the fifth indication indicating a third spatial relationship indication to be used for a third transmission in the second direction.

[0031] When the third indication indicates that the second spatial relationship indication should be used for a limited duration, the method may include receiving a sixth indication indicating a number of transmissions to be made using the second spatial relationship indication and / or the first spatial relationship indication, and using the received indications includes using the second spatial relationship indication and / or the first spatial relationship indication for the limited duration.

[0032] When the third instruction indicates that the second spatial relationship instruction should be used for a limited duration, the method may include receiving a sixth instruction indicating a duration for using the second spatial relationship instruction and / or the first spatial relationship instruction, wherein using the received instructions includes using the second spatial relationship instruction and / or the first spatial relationship instruction for the limited duration.

[0033] The second indication may indicate that the first spatial relationship indication should also be used for transmission in a second direction.

[0034] The third indication may further indicate whether the first spatial relationship indication should be used for a limited duration.

[0035] When the third indication indicates that the second spatial relationship indication should be used for a limited duration, the method can include using a fourth spatial relationship for transmission in the second direction after expiration of the limited duration, the fourth spatial relationship also being used for transmission occurring in the second direction before the second spatial relationship was used.

[0036] The first instruction and the second instruction may be represented by a single code point.

[0037] The first instruction and the second instruction may be represented by respective code points.

[0038] According to a fourth aspect, there is provided a method for an apparatus for an access node, the method including: transmitting to a terminal a first spatial relationship indication for a first transmission to be made in a first direction; transmitting to the terminal a second spatial relationship indication for a second transmission to be made in a second direction; transmitting to the terminal a third indication indicating whether the second spatial relationship indication should be used for a limited duration; and using the transmitted indications to receive and / or transmit signaling with the terminal.

[0039] The method may include determining an auxiliary spatial relationship for at least one transmission in a second direction, and using the determined auxiliary spatial relationship for the at least one transmission after using the second spatial relationship.

[0040] The method may include transmitting, from the at least one access node, a fourth indication indicating whether the second spatial relationship indication should apply to transmissions made in the second direction on resources that are part of the same resource group as resources in which the second transmission is made.

[0041] The method may include transmitting, to the terminal, a fifth indication indicating a third spatial relationship indication to be used for a third transmission in the second direction.

[0042] When the third indication indicates that the second spatial relationship indication should be used for a limited duration, the method may include transmitting a sixth indication indicating a number of transmissions to be made using the second spatial relationship indication and / or the first spatial relationship indication, and using the received indications includes using the second spatial relationship indication and / or the first spatial relationship indication for the limited duration.

[0043] When the third instruction indicates that the second spatial relationship instruction should be used for a limited duration, the method may include transmitting a sixth instruction indicating a duration for using the second spatial relationship instruction and / or the first spatial relationship instruction, and using the received instructions includes using the second spatial relationship instruction and / or the first spatial relationship instruction for the limited duration.

[0044] The second indication may indicate that the first spatial relationship indication should also be used for transmission in a second direction.

[0045] The third indication may further indicate whether the first spatial relationship indication should be used for a limited duration.

[0046] When the third indication indicates that the second spatial relationship indication should be used for a limited duration, the method can include using a fourth spatial relationship for transmission in the second direction after expiration of the limited duration, the fourth spatial relationship also being used for transmission occurring in the second direction before the second spatial relationship was used.

[0047] The first instruction and the second instruction may be represented by a single code point.

[0048] The first instruction and the second instruction may be represented by respective code points.

[0049] According to a fifth aspect, there is provided an apparatus for a terminal, the apparatus comprising: at least one processor; and at least one memory comprising computer code that, when executed on the at least one processor, causes the terminal to: receive, from the at least one access node, a first spatial relationship indication for a first transmission to be in a first direction; receive, from the at least one access node, a second spatial relationship indication for a second transmission to be in a second direction; receive, from the at least one access node, a third indication indicating whether the second spatial relationship indication should be used for a limited duration; and use the received indications to receive and / or transmit signaling with the at least one access node.

[0050] The terminal may be configured to determine an auxiliary spatial relationship for at least one transmission in a second direction, and to use the determined auxiliary spatial relationship for the at least one transmission after using the second spatial relationship.

[0051] The terminal may be configured to receive a fourth indication from the at least one access node indicating whether the second spatial relationship indication should be applied to transmissions made in the second direction on resources that are part of the same resource group as the resources on which the second transmission is made.

[0052] The terminal can be caused to receive a fifth indication from the at least one access node, the fifth indication indicating a third spatial relationship indication to be used for a third transmission in the second direction.

[0053] When the third indication indicates that the second spatial relationship indication should be used for a limited duration, the terminal may be caused to receive a sixth indication indicating a number of transmissions to be made using the second spatial relationship indication and / or the first spatial relationship indication, and using the received indications includes using the second spatial relationship indication and / or the first spatial relationship indication for the limited duration.

[0054] When the third instruction indicates that the second spatial relationship indication should be used for a limited duration, the terminal may be caused to receive a sixth instruction indicating a duration for using the second spatial relationship indication and / or the first spatial relationship indication, wherein using the received instructions includes using the second spatial relationship indication and / or the first spatial relationship indication for the limited duration.

[0055] The second indication may indicate that the first spatial relationship indication should also be used for transmission in a second direction.

[0056] The third indication may further indicate whether the first spatial relationship indication should be used for a limited duration.

[0057] When the third indication indicates that the second spatial relationship indication is to be used for a limited duration, the terminal may be caused to use a fourth spatial relationship for transmission in the second direction after expiration of the limited duration, the fourth spatial relationship also being used for transmission in the second direction before the second spatial relationship was used.

[0058] The first instruction and the second instruction may be represented by a single code point.

[0059] The first instruction and the second instruction may be represented by respective code points.

[0060] According to a sixth aspect, there is provided an apparatus for an access node, comprising at least one processor and at least one memory comprising computer code that, when executed on the at least one processor, causes the access node to transmit to a terminal a first spatial relationship indication for a first transmission to be in a first direction, transmit to the terminal a second spatial relationship indication for a second transmission to be in a second direction, transmit to the terminal a third indication indicating whether the second spatial relationship indication should be used for a limited duration, and use the transmitted indications to receive and / or transmit signaling with the terminal.

[0061] The access node may be configured to determine an auxiliary spatial relationship for at least one transmission in a second direction, and to use the determined auxiliary spatial relationship for the at least one transmission after using the second spatial relationship.

[0062] The access node may be caused to transmit, from the at least one access node, a fourth indication indicating whether the second spatial relationship indication should be applied to transmissions made in the second direction on resources that are part of the same resource group as the resources on which the second transmission is made.

[0063] The access node may be caused to transmit to the terminal a fifth indication indicating a third spatial relationship indication to be used for a third transmission in the second direction.

[0064] When the third indication indicates that the second spatial relationship indication should be used for a limited duration, the access node may be caused to transmit a sixth indication indicating a number of transmissions to be made using the second spatial relationship indication and / or the first spatial relationship indication, wherein using the received indications includes using the second spatial relationship indication and / or the first spatial relationship indication for the limited duration.

[0065] When the third indication indicates that the second spatial relationship indication should be used for a limited duration, the access node may be caused to transmit a sixth indication indicating a duration for using the second spatial relationship indication and / or the first spatial relationship indication, wherein using the received indication includes using the second spatial relationship indication and / or the first spatial relationship indication for the limited duration.

[0066] The second indication may indicate that the first spatial relationship indication should also be used for transmission in a second direction.

[0067] The third indication may further indicate whether the first spatial relationship indication should be used for a limited duration.

[0068] When the third indication indicates that the second spatial relationship indication should be used for a limited duration, the access node may be caused to use a fourth spatial relationship for transmission in the second direction after expiration of the limited duration, the fourth spatial relationship also being used for transmission in the second direction before the second spatial relationship was used.

[0069] The first instruction and the second instruction may be represented by a single code point.

[0070] The first instruction and the second instruction may be represented by respective code points.

[0071] According to a seventh aspect, there is provided an apparatus for a terminal, the apparatus comprising: a receiving circuit for receiving from the at least one access node a first spatial relationship indication for a first transmission to be made in a first direction; a receiving circuit for receiving from the at least one access node a second spatial relationship indication for a second transmission to be made in a second direction; a receiving circuit for receiving from the at least one access node a third indication indicating whether the second spatial relationship indication should be used for a limited duration; and a using circuit for using the received indications to receive and / or transmit signaling with the at least one access node.

[0072] The apparatus may include a determining circuit for determining an auxiliary spatial relationship for at least one transmission in a second direction, and a using circuit for using the determined auxiliary spatial relationship for the at least one transmission after using the second spatial relationship.

[0073] The apparatus may include a receiving circuit for receiving a fourth indication from the at least one access node indicating whether a second spatial relationship indication should be applied to transmissions made in a second direction on resources that are part of the same resource group as resources on which the second transmissions are made.

[0074] The apparatus can include a receiving circuit for receiving a fifth indication from the at least one access node, the fifth indication indicating a third spatial relationship indication to be used for a third transmission in the second direction.

[0075] When the third indication indicates that the second spatial relationship indication should be used for a limited duration, the device may include a receiving circuit for receiving a sixth indication indicating a number of transmissions to be made using the second spatial relationship indication and / or the first spatial relationship indication, and the using circuit for using the received indication includes using the second spatial relationship indication and / or the first spatial relationship indication for the limited duration.

[0076] When the third instruction indicates that the second spatial relationship instruction should be used for a limited duration, the device may include a receiving circuit for receiving a sixth instruction indicating a duration for using the second spatial relationship instruction and / or the first spatial relationship instruction, and the using circuit for using the received instructions includes using the second spatial relationship instruction and / or the first spatial relationship instruction for the limited duration.

[0077] The second indication may indicate that the first spatial relationship indication should also be used for transmission in a second direction.

[0078] The third indication may further indicate whether the first spatial relationship indication should be used for a limited duration.

[0079] When the third indication indicates that the second spatial relationship indication should be used for a limited duration, the device can include a usage circuit for using a fourth spatial relationship for transmission in the second direction after expiration of the limited duration, the fourth spatial relationship also being used for transmission occurring in the second direction before the second spatial relationship was used.

[0080] The first instruction and the second instruction may be represented by a single code point.

[0081] The first instruction and the second instruction may be represented by respective code points.

[0082] According to an eighth aspect, an apparatus for an access node is provided, the apparatus comprising: a transmitting circuit for transmitting, to a terminal, a first spatial relationship indication for a first transmission to be in a first direction; a transmitting circuit for transmitting, to the terminal, a second spatial relationship indication for a second transmission to be in a second direction; a transmitting circuit for transmitting, to the terminal, a third indication indicating whether the second spatial relationship indication should be used for a limited duration; and a using circuit for using the transmitted indications to receive and / or transmit signaling with the terminal.

[0083] The apparatus may include a determining circuit for determining an auxiliary spatial relationship for at least one transmission in a second direction, and a using circuit for using the determined auxiliary spatial relationship for the at least one transmission after using the second spatial relationship.

[0084] The apparatus may include a transmitting circuit for transmitting, from the at least one access node, a fourth indication indicating whether the second spatial relationship indication should be applied to transmissions made in the second direction on resources that are part of the same resource group as resources on which the second transmissions are made.

[0085] The apparatus can include a transmitting circuit for transmitting, to the terminal, a fifth indication indicating a third spatial relationship used for a third transmission in the second direction.

[0086] When the third indication indicates that the second spatial relationship indication should be used for a limited duration, the device may include a transmitting circuit for transmitting a sixth indication indicating a number of transmissions to be made using the second spatial relationship indication and / or the first spatial relationship indication, and the using circuit for using the received indication includes using the second spatial relationship indication and / or the first spatial relationship indication for the limited duration.

[0087] When the third instruction indicates that the second spatial relationship instruction should be used for a limited duration, the device can include a transmitting circuit for transmitting a sixth instruction indicating a duration for using the second spatial relationship instruction and / or the first spatial relationship instruction, and the using circuit for using the received instructions includes using the second spatial relationship instruction and / or the first spatial relationship instruction for the limited duration.

[0088] The second indication may indicate that the first spatial relationship indication should also be used for transmission in a second direction.

[0089] The third indication may further indicate whether the first spatial relationship indication should be used for a limited duration.

[0090] When the third indication indicates that the second spatial relationship indication should be used for a limited duration, the device can include a usage circuit for using a fourth spatial relationship for transmission in the second direction after expiration of the limited duration, the fourth spatial relationship also being used for transmission occurring in the second direction before the second spatial relationship was used.

[0091] The first instruction and the second instruction may be represented by a single code point.

[0092] The first instruction and the second instruction may be represented by respective code points.

[0093] According to a ninth aspect, a non-transitory computer-readable medium is provided, comprising program instructions to cause a terminal device to at least receive, from at least one access node, a first spatial relationship indication for a first transmission to be in a first direction, receive, from the at least one access node, a second spatial relationship indication for a second transmission to be in a second direction, receive, from the at least one access node, a third indication indicating whether the second spatial relationship indication should be used for a limited duration, and use the received indications to receive and / or transmit signaling with the at least one access node.

[0094] The terminal may be configured to determine an auxiliary spatial relationship for at least one transmission in a second direction, and to use the determined auxiliary spatial relationship for the at least one transmission after using the second spatial relationship.

[0095] The terminal may be configured to receive a fourth indication from the at least one access node indicating whether the second spatial relationship indication should be applied to transmissions made in the second direction on resources that are part of the same resource group as the resources on which the second transmission is made.

[0096] The terminal can be caused to receive a fifth indication from the at least one access node, the fifth indication indicating a third spatial relationship indication to be used for a third transmission in the second direction.

[0097] When the third indication indicates that the second spatial relationship indication should be used for a limited duration, the terminal may be caused to receive a sixth indication indicating a number of transmissions to be made using the second spatial relationship indication and / or the first spatial relationship indication, and using the received indications includes using the second spatial relationship indication and / or the first spatial relationship indication for the limited duration.

[0098] When the third instruction indicates that the second spatial relationship indication should be used for a limited duration, the terminal may be caused to receive a sixth instruction indicating a duration for using the second spatial relationship indication and / or the first spatial relationship indication, wherein using the received instructions includes using the second spatial relationship indication and / or the first spatial relationship indication for the limited duration.

[0099] The second indication may indicate that the first spatial relationship indication should also be used for transmission in a second direction.

[0100] The third indication may further indicate whether the first spatial relationship indication should be used for a limited duration.

[0101] When the third indication indicates that the second spatial relationship indication is to be used for a limited duration, the terminal may be caused to use a fourth spatial relationship for transmission in the second direction after expiration of the limited duration, the fourth spatial relationship also being used for transmission in the second direction before the second spatial relationship was used.

[0102] The first instruction and the second instruction may be represented by a single code point.

[0103] The first instruction and the second instruction may be represented by respective code points.

[0104] According to a tenth aspect, a non-transitory computer-readable medium is provided, comprising program instructions to cause an apparatus of an access node to at least transmit to a terminal a first spatial relationship indication for a first transmission to be in a first direction, transmit to the terminal a second spatial relationship indication for a second transmission to be in a second direction, transmit to the terminal a third indication indicating whether the second spatial relationship indication should be used for a limited duration, and use the transmitted indications to receive and / or transmit signaling with the terminal.

[0105] The access node may be configured to determine an auxiliary spatial relationship for at least one transmission in a second direction, and to use the determined auxiliary spatial relationship for the at least one transmission after using the second spatial relationship.

[0106] The access node may be caused to transmit, from the at least one access node, a fourth indication indicating whether the second spatial relationship indication should be applied to transmissions made in the second direction on resources that are part of the same resource group as the resources on which the second transmission is made.

[0107] The access node may be caused to transmit to the terminal a fifth indication indicating a third spatial relationship to be used for a third transmission in the second direction.

[0108] When the third indication indicates that the second spatial relationship indication should be used for a limited duration, the access node may be caused to transmit a sixth indication indicating a number of transmissions to be made using the second spatial relationship indication and / or the first spatial relationship indication, wherein using the received indications includes using the second spatial relationship indication and / or the first spatial relationship indication for the limited duration.

[0109] When the third indication indicates that the second spatial relationship indication should be used for a limited duration, the access node may be caused to transmit a sixth indication indicating a duration for using the second spatial relationship indication and / or the first spatial relationship indication, wherein using the received indication includes using the second spatial relationship indication and / or the first spatial relationship indication for the limited duration.

[0110] The second indication may indicate that the first spatial relationship indication should also be used for transmission in a second direction.

[0111] The third indication may further indicate whether the first spatial relationship indication should be used for a limited duration.

[0112] When the third indication indicates that the second spatial relationship indication should be used for a limited duration, the access node may be caused to use a fourth spatial relationship for transmission in the second direction after expiration of the limited duration, the fourth spatial relationship also being used for transmission in the second direction before the second spatial relationship was used.

[0113] The first instruction and the second instruction may be represented by a single code point.

[0114] The first instruction and the second instruction may be represented by respective code points.

[0115] According to an eleventh aspect, there is provided an electronic device which may comprise an apparatus as described herein.

[0116] According to a twelfth aspect, there is provided a chipset that may comprise an apparatus as described herein.

[0117] According to a thirteenth aspect there is provided a computer program comprising program instructions for causing a computer to carry out any of the methods as set out above.

[0118] According to a fourteenth aspect, there is provided a computer program product stored on a medium capable of causing an apparatus to perform any method as described herein.

[0119] Embodiments will now be described, by way of example only, with reference to the accompanying drawings, in which: [Brief description of the drawings]

[0120] [Figure 1] 1 is a schematic diagram of a 5G system. [Diagram 2] FIG. 2 is a schematic diagram of a network device. [Diagram 3] FIG. 2 is a schematic diagram of a user equipment. [Figure 4] 1 is a schematic diagram of a non-volatile memory medium storing instructions that, when executed by a processor, enable the processor to perform one or more of the method steps of some embodiments. [Diagram 5] A diagram showing example signaling between a UE and a network device. [Figure 6] FIG. 1 illustrates exemplary TCI states that can be used to control transmission and / or reception. [Figure 7] A diagram showing example signaling between a UE and a network device. [Figure 8] FIG. 1 illustrates exemplary TCI states that can be used to control transmission and / or reception. [Figure 9] 4 is a flow chart illustrating an exemplary operation of the described apparatus. [Figure 10] 4 is a flow chart illustrating an exemplary operation of the described apparatus. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0121] In the following, particular embodiments are described with reference to a mobile communication device capable of communicating via a wireless cellular system and a mobile communication system serving such a mobile communication device. Before describing illustrative mechanisms in detail, certain general principles of a 5G wireless communication system are briefly described with reference to FIG.

[0122] 1 shows a schematic representation of a 5G system (5GS) 100. The 5GS may include a User Equipment (UE) 102 (sometimes referred to as a communication device or terminal), a 5G Access Network (AN) (which may be a 5G Radio Access Network (RAN) or any other type of 5G AN such as a Non-3GPP Interworking Function (N3IWF) / Trusted Non-3GPP Gateway Function (TNGF) for untrusted / trusted non-3GPP access or a Wireline Access Gateway Function (W-AGF) for wireline access) 104, a 5G Core (5GC) 106, one or more Application Functions (AF) 108, and one or more Data Networks (DN) 110.

[0123] The 5G RAN may include one or more gNodeB (gNB) distributed unit functions connected to one or more gNodeB (gNB) central unit functions. The RAN may include one or more access nodes.

[0124] The 5GC 106 may include one or more Access Management Functions (AMFs) 112, one or more Session Management Functions (SMFs) 114, one or more Authentication Server Functions (AUSFs) 116, one or more Unified Data Management (UDM) Functions 118, one or more User Plane Functions (UPFs) 120, one or more Unified Data Repository (UDR) Functions 122, one or more Policy Control Functions (PCFs) 128, and / or one or more Network Exposure Functions (NEFs) 124. Although the PCF 128 is not depicted with its interfaces, this is for reasons of clarity, it being understood that the PCF 128 may have multiple interfaces with other network functions, such as the AMF 112 (via interface N15), the SMF 114 (via interface N7), the UDR 122 (through interface N36), the Network Data Analysis Function (NWDAF) 126 (through interface N23), and many other network functions.

[0125] The 5GC 106 also includes a network data analysis function (NWDAF) 126. The NWDAF is responsible for providing network analysis information upon request from one or more network functions or devices in the network. Network functions may also subscribe to the NWDAF 126 to receive information therefrom. Thus, the NWDAF 126 is also configured to receive and store network information from one or more network functions or devices in the network. Data collection by the NWDAF 126 may be performed based on at least one subscription to events provided by at least one network function.

[0126] A device performing a transmitting and / or receiving operation may transmit and / or receive using multiple antenna ports. It has been found that in some cases, two (or more) different physical antenna ports mapped to two different channels may exhibit one or more of the same / common radio channel characteristics. This means, for example, that if one of the channels suffers from Doppler spread, the other associated channel also suffers from Doppler spread. Examples of radio channel characteristics that may be common across different antenna ports include Doppler shift, Doppler spread, average delay, delay spread, and spatial reception parameters. When such antenna ports are paired according to such radio conditions, the UE / receiving entity can decode one signal using knowledge gathered after decoding the other signal. Such antenna ports (i.e., having at least one common radio channel characteristic) are said to be quasi-co-located (QCL).

[0127] A parameter known as a transmission configuration indicator (TCI) state can be used to signal which channels / antenna ports are QCL'd and therefore similar transmission and / or reception processing is performed on them. Thus, a TCI state can be said to indicate a spatial relationship between at least two channels and / or at least two ports. For example, a TCI state can be used to indicate a QCL relationship between a downlink reference signal in one channel state information (CSI) reference signal set and a physical downlink shared channel (PDSCH) demodulation reference (DMRS) signal port. The TCI state can be dynamically transmitted from the network to the UE using a downlink control information message. The UE can be configured by the network with a list of up to "M" TCI state configurations, where M depends on the UE capabilities.

[0128] Thus, the TCI state can be considered as a container containing QCL source reference signals from which the UE extracts and / or extrapolates spatial source characteristics to assist the UE in appropriately setting its receive beam for downlink reception. Similarly, the generic signaled spatial relationship carries reference signals that can be used as spatial sources to indicate to the UE how to set its transmit beam for uplink transmission.

[0129] When spatial information such as TCI status is used in the receiving process, it is useful to be able to flexibly and / or quickly update the spatial information when it changes. Current specific methods for TCI status or spatial relationship information update / indication for downlink and uplink channels rely on different operations due to different capabilities. The operations of TCI status / spatial relationship information signaling defined in Rel-15 new radio and Rel-16 new radio are briefly described below for several channels.

[0130] First, consider the configuration and / or activation of the uplink TCI state. The physical uplink control channel (PUCCH) can have a variety of different spatial relationship information that is configured via radio resource control (RRC) signaling. For example, the selection and activation of the spatial relationship can be performed via a medium access control (MAC) control element (CE) in a signaled message. In Rel-15, the spatial relationship update using a MAC CE (e.g., beam switch) is signaled per PUCCH resource. Rel-16 introduces the possibility that the spatial relationship is updated simultaneously per group of PUCCH resources by using one MAC CE, and the UE has up to four configured groups of PUCCH resources.

[0131] An aperiodic sounding reference signal (A-SRS) was also introduced in these specifications for the UE to transmit a network uplink signal to measure the uplink characteristics. The specific resource on which this is signaled can be indicated using MAC CE based spatial relationship updates of the aperiodic SRS per resource level.

[0132] Secondly, consider enabling and / or setting the downlink TCI state. Downlink control information (DCI) carried on the PDCCH has a 3-bit field that can be used to select a specific TCI state among the enabled TCI states for PDSCH beam direction. In general, the DCI can be used to indicate resource allocation in the uplink or downlink for one radio network temporary identifier. For this purpose and throughout the following, resource refers to a unit defined by reference to a specific time and frequency. Resources may be allocable as described above. By extension, CORESET refers to a time and frequency allocation for the PDCCH and is generalized to a set of resource blocks and OFDM symbols. Thus, the DCI can carry various pieces of information, but the useful content depends on the specific case of system deployment or operation.

[0133] For the Physical Downlink Shared Channel (PDSCH), up to eight TCI states can be enabled using the MAC-CE.

[0134] Each CORESET of the UE can be configured with up to K TCI states of the physical downlink control channel, and prior to MAC-CE signaling is used to indicate which TCI state should be used.

[0135] Agreement has recently been reached on the scope of Rel-17 for enhancements to multi-beam operation.

[0136] One major objective in these agreements is to improve communication latency and efficiency through increased use of dynamic control signaling. Thus, similar to PDSCH, Layer 1 signaling is used to indicate the TCI status / spatial relationship of uplink and downlink channels such as PUCCH, SRS, etc.

[0137] Another agreed objective is to enable a unified / common TCI framework for downlink and uplink beam indication. Thus, the spatial relationship framework introduced in Rel-15 will eventually be replaced by the TCI framework of the present invention, or at least the latter framework will need to be added on top of the former framework. The term TCI state can then be used to refer to (or replace) spatial relationship information, or even to SRS resource indicator (SRI). However, for clarity in the following, phrases such as "spatial relationship indication" will also be understood to encompass TCI state information (or simply "TCI"), SRI, beam information, and / or spatial filter information, unless expressly stated otherwise. More generally, all of these terms can be used interchangeably.

[0138] One scenario where the latency and flexibility aspects of the TCI status indication are useful is when an uplink transmission is triggered by or in response to a downlink transmission, and vice versa. This is especially true for transmissions assigned to some high priority traffic, such as ultra-reliable low latency communications. One example of such a scenario is a PUCCH carrying an acknowledgement (such as a Hybrid Automatic Repeat Request (HARQ) acknowledgement) in response to reception on a PDSCH. Another example is the transmission of an explicit downlink HARQ-ACK in response to an uplink transmission, such as a configuration grant (CG) / semi-persistent scheduling (SPS) PUSCH.

[0139] As explained above, it is currently not possible to indicate the TCI status (or other types of spatial relationship information) of an uplink channel such as PUCCH via Layer 1 signaling (i.e., at the physical layer). However, such a mechanism would be useful to enable faster beam pointing / updating, especially if suited to the envisaged common TCI framework.

[0140] It should also be noted that multiple transmission / reception point (multi-TRP) scenarios are also taken into consideration in future communication protocols. In such cases, multiple TRPs (e.g., macrocells, small cells, picocells, femtocells, remote radio heads, relay nodes, etc.) can be used to perform communication to and / or from the UE. For example, a UE can have candidate beam-pair links for multiple TRPs in downlink and / or uplink for robustness against interference and for scheduling flexibility and low latency. Thus, spatial information for transmissions in both directions becomes useful.

[0141] It is currently unclear how such functionality would interact with the downlink TCI indication of downlink transmissions, as expected Layer 1 signaling is also used for uplink TCI status indication, which has implications in terms of downlink control overhead.

[0142] On the other hand, the current procedure for indicating spatial relationship information (such as TCI status) of PUCCH via MAC CE has a problem of limited flexibility. For example, when spatial relationship information is indicated for a PUCCH resource (identified by a PUCCH resource index), the UE can apply this same spatial relationship for any PUCCH transmission that uses that PUCCH resource until a further update of the spatial relationship of that resource is received. However, this may greatly limit flexibility in scenarios where a temporary spatial relationship update / indication of the spatial relationship (e.g., for only one transmission) is needed. For example, such a temporary update is beneficial at least in the following cases: (i) when a bidirectional TCI status indication is set, (ii) multi-TRP operation when the network wants to offload some uplink transmissions to the second TRP or want to only allow some important uplink transmissions towards a particular TRP, (iii) a temporary MPE (maximum permissible exposure) event that affects some spatial relationship, (iv) when the network is aware of a temporary disturbance that affects some spatial relationship.

[0143] In addition, if a PUCCH resource belongs to one of the RRC configured PUCCH resource groups, currently a spatial relationship update for any resource in the corresponding group results in the same update for other PUCCH resources in that group, which is another limitation of the current procedure.

[0144] Based on the above considerations and observations, the following focuses on providing at least one mechanism for enabling flexible and rapid bidirectional TCI status indication.

[0145] The mechanism is illustrated with respect to several examples, after which a more general discussion of these examples is presented.

[0146] 5 is a signaling diagram illustrating possible signals exchanged between a UE 501 and a network 502. The network 502 may represent at least one network entity in communication with the UE 501, such as an access node.

[0147] In 5001, the network 502 signals the UE 501. This signaling configures the UE with a set of downlink and uplink TCI states. At least some of the downlink and uplink TCI states are paired, which means that at least one downlink TCI state is paired with at least one uplink TCI state.

[0148] At 5002, the network 502 signals the UE 501 to enable at least one of the paired downlink and uplink TCI states.

[0149] In 5003, the network 502 signals to the UE 501. The signaling indicates TCI code points corresponding to the downlink TCI state and the uplink TCI state, where the TC code point is a single label to refer to a combination of the downlink TCI and the uplink TCI. For example, when the uplink TCI state and the downlink TCI state are configured separately, the TCI code point can refer to a pair of the uplink TCI state and the downlink TCI state, so that both are indicated by the same code point. As another example, when the same TCI state is to be used for the uplink and the downlink, the TCI code point can refer to one TCI state that is common to both the downlink and the uplink. In general, the code points are character encoding standards for computer storage and transmission of letters, characters, and symbols of most languages ​​and writing systems.

[0150] The signaling further indicates whether at least one of the TCI state updates is temporary or not.

[0151] In 5004, the UE 501 determines the downlink receive TCI status and the uplink transmit TCI status of the indicated / configured resource, and further determines whether the TCI status update is temporary or not.

[0152] At 5005, the network 502 performs at least one downlink transmission in the indicated downlink reception TCI state to the UE 501. The UE 501 is capable of receiving the transmission in the indicated downlink reception TCI state.

[0153] At 5006, the UE 501 performs at least one uplink transmission in the indicated uplink transmission TCI state to the network 502. The network 502 can receive the transmission in the indicated uplink transmission TCI state.

[0154] FIG. 6 shows the mechanisms involved in temporary bidirectional TCI status updates / indications.

[0155] 6 illustrates signaling over time that may be provided between a UE and a network. The signaling includes a DCI portion 601. The DCI portion may include code points corresponding to paired downlink and uplink TCI states. The DCI portion 601 may include, for example, an instruction to apply a temporary update of the uplink TCI for a single transmission.

[0156] At 602, there is signaling from the network to the UE on the physical downlink shared channel using the indicated downlink TCI state provided at 601. In other words, the network can transmit to the UE using the indicated downlink TCI state provided at 601.

[0157] At 603, there is signaling from the UE to the network on the physical uplink shared channel using the indicated uplink TCI state signaled in 601. This signaling may form at least a part of a HARQ acknowledgment for the downlink data received by the UE during 602. When the time to use this indicated uplink TCI state expires (e.g., because the state is temporary), the uplink TCI state may revert to the TCI state used immediately before the temporary indicated uplink TCI state was used.

[0158] In this example, an uplink transmission is provided in response to a downlink transmission if there is a PUCCH carrying a PDSCH transmission and HARQ acknowledgement feedback corresponding to that PDSCH. After the network enables multiple paired downlink reception TCI states and uplink transmission TCI states, the network indicates code points corresponding to the downlink reception TCI states and uplink transmission TCI states via DCI (e.g., transmitted on a PDCCH). These TCI states can then be used by the UE for PDSCH reception and PUCCH transmission, respectively.

[0159] The network also indicates to the UE via the DCI that the indicated uplink TCI state of the indicated / configured PUCCH resource (indicated by the PUCCH resource index) is a temporary update. The indication as to whether the TCI update is applied temporarily or more permanently (until a future update) can be made explicit. For example, the indication that the change is a temporary update can be conveyed explicitly using, for example, a one-bit field (e.g., a flag) in the DCI. The UE can then use the indicated uplink transmission TCI state only for the configured number and / or duration of PUCCH transmissions on the corresponding indicated / configured PUCCH resource.

[0160] After this set number / predetermined duration of uplink PUCCH transmissions, the UE can go back to using the previously used uplink transmission TCI state information of this resource (i.e. the uplink transmission TCI state used before the temporary indicated uplink TCI state was used). In this embodiment, the said number is equal to one transmission. In other words, in this embodiment, the temporary update signaled in 601 applies to only one PUCCH transmission on the corresponding PUCCH resource. It is understood that other numbers of PUCCH transmissions may be specified. It is further understood that as an alternative to using a number of transmissions, a time period may be set, such as a timer or a number of transmission time slots during which the temporary update applies. In general, it can be said that the timer, the transmission time unit and / or the number of transmissions all indicate the duration during which the signaled / indicated uplink TCI state will apply.

[0161] The use of such temporary TCI state updates and the flexibility provided by this operation may be beneficial in several scenarios such as multi-TRP operation, temporary MPE events, temporary disturbances in the network, etc.

[0162] 7 illustrates another exemplary signaling mechanism. In this example, signals are transmitted between a UE 701 and a network 702. The network 702 can represent a single network entity, such as an access node. The network 702 may also represent multiple network entities, such as multiple access nodes.

[0163] At 7001, the network 702 signals the UE 701. This signal configures the UE 701 with a set of downlink and uplink TCI states.

[0164] In 7002, the network 702 signals the UE 701 to enable at least a portion of the downlink and uplink TCI states configured in 7001. This portion may be less than the entire set of downlink and uplink TCI states configured in 7001. This portion may be the entire set of downlink and uplink TCI states configured in 7001.

[0165] At 7003, the network 702 signals to the UE 701 the downlink receive TCI state, whether the uplink TCI transmit state is the same as the indicated downlink receive TCI state, and whether the uplink transmit TCI state is temporary.

[0166] In 7004, the UE 701 determines the downlink receiving TCI state and the uplink transmitting TCI state of the indicated / configured resource. The UE 701 may also determine whether the uplink transmitting TCI state is temporary.

[0167] At 7005, the network 702 signals / transmits to the UE 701 using the indicated downlink TCI state of 7003 (enabled at 7002).

[0168] At 7006, the UE 701 signals / transmits to the network 702 using the indicated uplink transmission TCI state of 7003.

[0169] FIG. 8 illustrates the mechanisms involved in temporary bidirectional TCI status updates / indications.

[0170] 8 illustrates signaling over time that may be provided between a UE and a network device. The signaling includes a DCI portion 801. The DCI portion may include an indication of a downlink TCI state. The DCI portion 801 may include an indication that the uplink transmit TCI state is the same as the indicated downlink receive TCI state. The DCI portion 801 may include an indication to apply a temporary update of the uplink TCI for a single transmission, for example.

[0171] At 802, there is signaling / transmission from the network to the UE on a physical downlink shared channel using the indicated downlink TCI state.

[0172] At 803, there is signaling from the UE to the network on the physical uplink control channel (e.g., as part of a HARQ acknowledgement) using the indicated uplink TCI state. When the time to use this indicated uplink TCI state expires (e.g., because the state is temporary), the uplink TCI state can revert to the TCI state that was used just before the temporary indicated uplink TCI state was used.

[0173] This example considers a scenario similar to the one used in the example of Figure 6. In the example of Figure 8, the network indicates (e.g., via DCI transmitted on the PDCCH) the downlink Rx TCI state to be used by the UE for PDSCH reception.

[0174] The network can indicate (e.g., via the same DCI) that the uplink transmission TCI state is the same as the indicated downlink reception TCI state. In other words, the UE can use this indication as an instruction to use the downlink TCI state of the PDSCH for the transmission of the PUCCH as well. In general, an indication can be signaled to the UE whether the downlink reception TCI state can also be used for the uplink transmission TCI state, or whether the existing uplink transmission TCI state used immediately before the reception of these indications can be used for the uplink transmission. This signaling can be achieved in several different ways. For example, this signaling of which uplink TCI state to use (i.e., the same as the newly indicated downlink PDSCH TCI state or the same as the currently used uplink TCI state) may be signaled using a one-bit field in the DCI.

[0175] When the same uplink and downlink TCI state is to be used, the network can also use which HARQ-ACK transmission is made to indicate to the UE that the indicated uplink Tx TCI state of the indicated / configured PUCCH resource (indicated by the PUCCH resource index) is a temporary update / indication. This may be as described with respect to Figure 6. For example, the signaling may be performed by sending an indication in the DCI to the UE that the new indicated uplink TCI state is temporary.

[0176] The UE may use the determined uplink Tx TCI state only for the configured number of PUCCH transmission resources. The network also indicates to the UE via the DCI that the indicated uplink TCI state of the indicated / configured PUCCH resource (indicated by the PUCCH resource index) is a temporary update. The indication as to whether a temporary update applies or not may be made explicitly. For example, the indication that the change is a temporary update may be conveyed explicitly using, for example, a one-bit field (e.g., a flag) in the DCI. The UE may then use the indicated uplink transmission TCI state only for the configured number and / or duration of PUCCH transmissions on the corresponding indicated / configured PUCCH resource.

[0177] After this configured number / predetermined duration of uplink PUCCH transmissions, the UE can revert to using the previously used uplink transmission TCI state information for this resource (i.e. the uplink transmission TCI state used before the temporary indicated uplink TCI state was used). In this embodiment, the above number is equal to one transmission, i.e. the temporary update applies to only one PUCCH transmission on the corresponding PUCCH resource. It is understood that other numbers of PUCCH transmissions may be specified. It is further understood that as an alternative to using a number of transmissions, a timer or time period during which the temporary update applies may be configured.

[0178] The above example shows the great flexibility allowed by the mechanism described herein. An additional aspect that further increases this flexibility is that it allows the network to control whether the indicated TCI state of a PUCCH resource that belongs to a configured PUCCH resource group should apply to the whole group or only to that resource.

[0179] As explained above, such flexibility can be beneficial in several scenarios such as multi-TRP, MPE events, jamming, etc. Furthermore, the proposed solution provides clear advantages in terms of efficiency and latency of the TCI status indication mechanism.

[0180] The mechanisms described herein are also useful for scenarios where a transmission in one direction (uplink or downlink) is in response to another transmission in the other direction (downlink or uplink, respectively), such as a PUCCH carrying a HARQ-ACK in response to a PDSCH. Indeed, for high priority scenarios, the mechanisms described herein can be used to enable efficient and fast bidirectional TCI status indication.

[0181] It is further noted that all the examples provided may be modified and adapted to cases where there is a downlink transmission in response to an uplink transmission, such as a downlink HARQ acknowledgment (e.g., on a specific Physical Downlink Control Channel (PDCCH)) in response to a Physical Uplink Shared Channel (PUSCH) retransmission operation.

[0182] For example, in the case of unauthorized operation, a transmitting device such as a gNB can obtain channels and allocations that can be used by the transmitting device on the downlink and the receiving device (e.g., UE) on the uplink. This is some kind of shared channel occupation time during which there can be one or more downlink and uplink timing units. In that use case, the indicated TCI state to be used for downlink transmission in the downlink portion for the UE can be used as a spatial source for the UE's uplink transmission within the same shared channel occupation time (COT) when the uplink timing unit follows the downlink timing unit.

[0183] In the above, the network enables certain downlink receiving and uplink transmitting TCI states in the UE, which may be performed via several different signaling mechanisms, including using a medium access control control element and by an indication sent in the downlink control information.

[0184] Some of the downlink TCI states and uplink TCI states may be paired, so that a TCI code point corresponds to a downlink receiving TCI state and an uplink transmitting TCI state. In such a case, signaling using a single TCI code point indicates both the downlink receiving TCI state and the uplink transmitting TCI state to be enabled. As another example, the same enabled TCI state may be used for both the downlink receiving TCI state and the uplink transmitting TCI state. In such a case, signaling using a single TCI code point indicates both the downlink receiving TCI state and the uplink transmitting TCI state, and both of these TCI states are the same. Thus, in both of these exemplary cases, the network can then signal to the UE one code point corresponding to one downlink receiving TCI state and one uplink transmitting TCI state. This signaling can be implemented using downlink control information signaling. As another exemplary case, the network can signal one downlink receive TCI state and one uplink transmit TCI state using two separate code points, which can be implemented using downlink control information signaling.

[0185] The network can signal both downlink reception TCI state and uplink transmission TCI state by explicitly indicating only one of them. In this case, a flag can be used to instruct the UE whether the indicated TCI state of the downlink reception TCI state should also be used for the uplink transmission TCI state or whether the existing uplink TCI state information should be used. This signaling (e.g., of a flag) can be implemented using downlink control information signaling. The flag can be, for example, a 1-bit field in the DCI.

[0186] The network may indicate to the UE whether the indicated TCI state of the resource is a temporary update / indication. This signaling may be implemented using downlink control information signaling. If the indicated TCI state is a temporary update, the UE may use the indicated TCI state only for the configured duration. The duration may be expressed in terms of a number N (e.g., N=1) of transmissions on the corresponding indication / configured resource. As another example, the network may configure the UE with a timer, where, if applicable, the temporary indication is valid as long as the timer does not expire. The timer may also be expressed in terms of a number of time slots. The time slots may be defined according to the communication protocol. The UE may be provided with the duration in at least one of a number of different ways. For example, the duration may be signaled to the UE using downlink control information signaling. The duration may be signaled to the UE using MAC CE. The UE may be configured with the duration via radio resource control signaling.

[0187] After the duration expires (e.g., the number of transmissions has been made, the timer expires, etc.), the UE can go back to using the previously used / configured TCI state information for this resource. In other words, the UE can go back to the TCI state it had before the indication was received. If a temporary indication had not been received, the UE would use the indicated TCI state for any transmissions on the corresponding resource until the TCI state for this resource is updated again.

[0188] The network can also indicate to the UE, when the indicated uplink TCI state is the TCI state of a resource belonging to a configured uplink resource group, whether the indicated TCI state should also apply to the whole group or only to that resource. When a TCI state update is indicated to be temporary for a resource and the TCI state applies to the whole resource group (and not just to that resource), the temporary update operation may also be applicable to the whole group, so that the resource group reverts to the previous TCI state when the duration expires. This signaling can be implemented using downlink control information signaling.

[0189] In one example, to enable beam diversity for uplink retransmission operations such as PUCCH retransmissions, the network can transmit the uplink transmission TCI state using at least one of the proposed methods above. The network can instruct and / or configure the UE to determine a second uplink transmission TCI state. This may be performed, for example, using the existing TCI state of the corresponding PUCCH resource, the indicated downlink reception TCI state, the default TCI state of the PUCCH, or any other uplink transmission TCI state configured for such use. The default TCI may be the TCI of the CORESET with the smallest ID, or a commonly explicitly defined and configured default TCI state of the uplink.

[0190] The network may indicate and / or configure the UE to make this decision using, for example, a one-bit field in the downlink control information indicating whether to use the existing TCI state of the corresponding PUCCH resource or to use the default TCI state of the PUCCH. As another example, the network may indicate two uplink transmit TCI states by indicating code points corresponding to the two uplink Tx TCI states. Such a shared code point may be configured by the network.

[0191] Although the above focuses mostly on setting the uplink TCI state, it will be appreciated that the proposed mechanism may be applied to uplink resources, downlink resources, or both uplink and downlink resources simultaneously.

[0192] 9 is a flow diagram illustrating possible operations that may be performed by an apparatus for a terminal. The terminal may interact with an access node that operates as described below with reference to FIG.

[0193] At 901, a terminal receives a first spatial relationship indication from at least one access node for a first transmission to occur in a first direction.

[0194] At 902, a terminal receives a second spatial relationship indication from at least one access node for a second transmission in a second direction. The first direction may be an uplink and the second direction may be a downlink. Alternatively, the first direction may be a downlink and the second direction may be an uplink.

[0195] At 903, the terminal receives, from the at least one access node, a third indication indicating whether the second spatial relationship indication should be used for a limited duration. In other words, the terminal receives, from the at least one access node, a third indication indicating whether the second spatial relationship indication should be used for a limited duration.

[0196] At 904, the terminal uses the received indication for receiving and / or transmitting signaling with the at least one access node.

[0197] In the above, it is understood that the signal / indication received by the terminal from the access node may be transmitted by an appropriate communication mechanism. For example, the indication may be transmitted to the terminal using a DCI. As another example, the indication may be transmitted to the terminal using an RRC-based mechanism. It is not necessary that different indications are transmitted using the same mechanism. However, it is understood that different indications may be transmitted using the same mechanism.

[0198] The terminal may determine an auxiliary spatial relationship for at least one transmission in a second direction, and use the determined auxiliary spatial relationship for the at least one transmission after using the second spatial relationship.

[0199] The terminal can receive a fourth indication from the at least one access node indicating whether the second spatial relationship indication should be applied to transmissions made in the second direction on resources that are part of the same resource group as the resources on which the second transmission is made. In other words, the terminal can receive a fourth indication from the at least one access node indicating whether the second spatial relationship indication should be applied to transmissions made in the second direction on resources that are part of the same resource group as the resources on which the second transmission is made.

[0200] The terminal may receive a fifth indication from the at least one access node, the fifth indication indicating a third spatial relationship indication to be used for a third transmission in the second direction.

[0201] When the third indication indicates that the second spatial relationship indication should be used for a limited duration, the terminal may receive a sixth indication indicating a number of transmissions to be made using the second spatial relationship indication and / or the first spatial relationship indication, and using the received indication includes using the second spatial relationship indication and / or the first spatial relationship indication for the limited duration.

[0202] When the third indication indicates that the second spatial relationship indication should be used for a limited duration, the terminal may receive a sixth indication indicating a duration for using the second spatial relationship indication and / or the first spatial relationship indication, where using the received indication includes using the second spatial relationship indication and / or the first spatial relationship indication for the limited duration.

[0203] The second indication may indicate that the first spatial relationship indication should also be used for transmission in a second direction.

[0204] The third indication may further indicate whether the first spatial relationship indication should be used for a limited duration. In other words, the third indication may further indicate whether the first spatial relationship indication should be used for a limited duration.

[0205] When the third indication indicates that the second spatial relationship indication should be used for a limited duration, the terminal may use a fourth spatial relationship for transmission in the second direction after expiration of the limited duration, the fourth spatial relationship also being used for transmission in the second direction before the second spatial relationship was used.

[0206] The first instruction and the second instruction may be represented by a single code point.

[0207] The first instruction and the second instruction may be represented by respective code points.

[0208] 10 is a flow diagram illustrating possible operations that can be implemented by an apparatus for an access node that can interact with terminals operating as described above with reference to FIG.

[0209] At 1001, an access node transmits a first spatial relationship indication to a terminal for a first transmission to occur in a first direction.

[0210] At 1002, an access node transmits to a terminal a second spatial relationship indication for a second transmission in a second direction. The first direction may be an uplink and the second direction may be a downlink. Alternatively, the first direction may be a downlink and the second direction may be an uplink.

[0211] At 1003, the access node transmits to the terminal a third indication indicating whether the second spatial relationship indication should be used for a limited duration. In other words, the access node transmits to the terminal a third indication indicating whether the second spatial relationship indication should be used for a limited duration.

[0212] At 1004, the access node uses the transmitted indication for receiving and / or transmitting signaling with the terminal.

[0213] In the above, it is understood that the signal / indication received by the terminal from the access node may be transmitted by an appropriate communication mechanism. For example, the indication may be transmitted to the terminal using a DCI. As another example, the indication may be transmitted to the terminal using an RRC-based mechanism. It is not necessary that different indications are transmitted using the same mechanism. However, it is understood that different indications may be transmitted using the same mechanism.

[0214] The access node may determine an auxiliary spatial relationship for at least one transmission in a second direction. The access node may then use the determined auxiliary spatial relationship for the at least one transmission after using the second spatial relationship.

[0215] The access node may transmit to the terminal a fourth indication indicating whether the second spatial relationship indication should be applied to transmissions made in the second direction on resources that are part of the same resource group as the resources on which the second transmission is made. In other words, the access node may transmit to the terminal a fourth indication indicating whether the second spatial relationship indication should be applied to transmissions made in the second direction on resources that are part of the same resource group as the resources on which the second transmission is made.

[0216] The access node may send a fifth indication to the terminal indicating a third spatial relationship to be used for a third transmission in the second direction.

[0217] When the third indication indicates that the second spatial relationship indication should be used for a limited duration, the access node may transmit a sixth indication indicating a number of transmissions to be made using the second spatial relationship indication and / or the first spatial relationship indication, wherein using the received indication includes using the second spatial relationship indication and / or the first spatial relationship indication for the limited duration.

[0218] When the third indication indicates that the second spatial relationship indication should be used for a limited duration, the access node may transmit a sixth indication indicating a duration for using the second spatial relationship indication and / or the first spatial relationship indication, wherein using the received indication includes using the second spatial relationship indication and / or the first spatial relationship indication for the limited duration.

[0219] The second indication may indicate that the first spatial relationship indication should also be used for transmission in a second direction.

[0220] The third indication may further indicate whether the first spatial relationship indication should be used for a limited duration. In other words, the third indication may further indicate whether the first spatial relationship indication should be used for a limited duration.

[0221] When the third indication indicates that the second spatial relationship indication should be used for a limited duration, the access node may use a fourth spatial relationship for transmission in the second direction after expiration of the limited duration, the fourth spatial relationship also being used for transmission in the second direction before the second spatial relationship was used.

[0222] The first instruction and the second instruction may be represented by a single code point.

[0223] The first instruction and the second instruction may be represented by respective code points.

[0224] FIG. 2 shows an example of a control device of a communication system for coupling to and / or controlling a station of an access system, e.g. an access node such as a base station gNB, a central unit of a cloud architecture or a node of a core network such as an MME or S-GW, a scheduling entity such as a spectrum management entity, or a server or host of an apparatus hosting e.g. an NWDAF, an AMF, an SMF, an UDM / UDR, etc. The control device may be integrated with a node or module of the core network or a radio access network (RAN) node, or may be external thereto. In some examples, the base station comprises a separate control device unit or module. In other examples, the control device may be another network element such as a radio network controller or a spectrum controller. The control device 200 may be configured to provide control over the communication in the service area of ​​the system. The device 200 comprises at least one memory 201, at least one data processing unit 202, 203, and an input / output interface 204. Via the interface, the control device may be coupled to a receiver and a transmitter of the apparatus. The receiver and / or the transmitter may be implemented as a radio front end or a remote radio head. For example, the controller 200 or processor 201 may be configured to execute appropriate software code to provide the control functionality.

[0225] A possible wireless communication device will now be described in more detail with reference to FIG. 3, which shows a schematic partial cross-sectional view of a communication device 300. Such communication devices are often referred to as user equipment (UE) or terminal. A suitable mobile communication device may be provided by any device capable of transmitting and receiving radio signals. Non-limiting examples include mobile stations (MS) or mobile devices such as mobile phones or what are known as "smartphones", computers provided with wireless interface cards or other wireless interface facilities (e.g. USB dongles), personal digital assistants (PDAs) or tablets provided with wireless communication capabilities, or any combination thereof. Mobile communication devices may provide communication of data for carrying communications such as voice, electronic mail (E-mail), text messages, multimedia, etc. Thus, users may be provided and offered a multitude of services via their communication devices. Non-limiting examples of these services include two-way or multi-way calls, data communication or multimedia services, or simply access to a data communication network system such as the Internet. Users may also be offered broadcast or multicast data. Non-limiting examples of content include downloads, television and radio programs, videos, advertisements, various alerts, and other information.

[0226] A wireless communication device may, for example, be a mobile device, i.e., a device that is not fixed to a particular location, or may be a stationary device. A wireless device may or may not require human interaction for communication. In the present teachings, the term UE or "user" is used to refer to any type of wireless communication device.

[0227] The wireless device 300 can receive signals over an air or radio interface 307 via suitable equipment for reception and can transmit signals via suitable equipment for transmitting radio signals. In Fig. 3, a transceiver unit is generally designated by a block 306. The transceiver unit 306 can be provided, for example, by using radio components and an associated antenna arrangement. The antenna arrangement can be located inside or outside the wireless device.

[0228] A wireless device is typically provided with at least one data processing entity 301, at least one memory 302, and possibly other components 303 for use in software and hardware assisted execution of the tasks that the wireless device is designed to perform, including controlling access to and communication with access systems and other communication devices. The data processing, storage and other related control devices may be provided on a suitable circuit board and / or in a chipset. This feature is designated by reference or 304. A user may control the operation of the wireless device by using a suitable user interface such as a keypad 305, voice commands, a touch sensitive screen or pad, combinations thereof, etc. A display 308, a speaker and a microphone may also be provided. Furthermore, the wireless communication device may be provided with suitable connectors (either wired or wireless) to other devices and / or for connecting external accessories, for example hands-free equipment, to the wireless communication device.

[0229] FIG. 4 shows a schematic diagram of non-volatile memory media 400a (e.g., a computer disk (CD) or a digital versatile disk (DVD)) and 400b (e.g., a universal serial bus (USB) memory disk) storing instructions and / or parameters 402 that, when executed by a processor, enable the processor to perform one or more of the method steps of FIGS. 9-10.

[0230] Thus, the embodiments may vary within the scope of the appended claims. In general, some embodiments may be implemented in hardware or dedicated circuits, software, logic, or any combination thereof. For example, some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software that can be executed by a controller, microprocessor, or other computing device, but the embodiments are not limited thereto. Although various embodiments have been illustrated and described as block diagrams, flow diagrams, or using any other graphical depiction, it will be understood that these blocks, apparatus, systems, techniques, or methods described herein may be implemented in, as non-limiting examples, hardware, software, firmware, dedicated circuits or logic, general-purpose hardware or controller or other computing device, or any combination thereof.

[0231] The embodiments may be implemented by computer software stored in a memory and executable by at least one data processor of the participating entities, by hardware, or by a combination of software and hardware. It should be noted in this regard that any procedure, e.g., as in Figures 9-10, may represent program steps, or interconnected logic circuits, blocks and functions, or a combination of program steps and logic circuits, blocks and functions. The software may be stored on physical media, such as memory chips or memory blocks implemented within a processor, magnetic media, such as hard disks or floppy disks, and optical media, e.g., DVDs and their data variants, CDs, etc.

[0232] The memory may be of any type suitable for the local technology environment and may be implemented using any suitable data storage technology, such as semiconductor-based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed and removable memories, etc. The data processor may be of any type suitable for the local technology environment and may include, by way of non-limiting examples, one or more of a general purpose computer, a special purpose computer, a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), gate level circuitry, and a processor based on a multi-core processor architecture.

[0233] Alternatively or additionally, some embodiments may be implemented using circuitry that may be configured to perform one or more of the functions and / or method steps described above. The circuitry may be provided within a base station and / or a communication device.

[0234] As used in this application, the term "circuitry" may refer to one or more or all of the following: (a) Hardware-only circuit implementations (e.g., implementations entirely in analog and / or digital circuitry); (b) 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 (including a digital signal processor), software, and memory with software that cooperates to cause an apparatus, such as a communications device or base station, to perform the various functions described above; and (c) A hardware circuit and / or processor, such as a microprocessor or a portion of a microprocessor, that requires software (e.g., firmware) for operation, although the software may not be present if it is not required for operation.

[0235] This definition of circuitry applies to all uses of the term in this application, including any claims. As a further example, the term circuitry as used in this application also covers a hardware circuit or processor (or processors) or a portion of a hardware circuit or processor and its (or their) associated software and / or firmware only implementations. The term circuitry also covers, for example, integrated devices.

[0236] The above description has provided a complete and informative description of several embodiments as illustrative and non-limiting examples. However, various modifications and adaptations may become apparent to those skilled in the art in light of the above description, when read in conjunction with the accompanying drawings and the appended claims. However, all such and similar modifications of the present teachings will still fall within the scope as defined in the appended claims.

Claims

1. An apparatus for a terminal, comprising: means for receiving, from the at least one access node, a first spatial relationship indication for a first transmission to be in a first direction; means for receiving from the at least one access node a second spatial relationship indication for a second transmission to be in a second direction; means for receiving a third indication from the at least one access node indicating whether the second spatial relationship indication should be used for a limited duration; and means for using the received indication for receiving and / or transmitting signaling with the at least one access node; means for receiving a fourth indication from the at least one access node indicating whether the second spatial relationship indication should be applied to transmissions made in the second direction on resources that are part of the same resource group as resources on which the second transmission is made; and Equipped with When the third indication indicates that the second spatial relationship indication should be used for a limited duration, the apparatus comprises means for receiving a sixth indication indicating a number of transmissions to be made using the second spatial relationship indication and / or the first spatial relationship indication, and the means for using the received indications includes using the second spatial relationship indication and / or the first spatial relationship indication for the limited duration.

2. 2. The apparatus of claim 1, comprising: means for determining an auxiliary spatial relationship for at least one transmission in the second direction; and means for using the determined auxiliary spatial relationship for the at least one transmission after using the second spatial relationship.

3. 3. The apparatus of claim 1, further comprising: means for receiving a fifth indication from the at least one access node, the fifth indication indicating a third spatial relationship indication to be used for a third transmission in the second direction.

4. 4. The apparatus of claim 1, wherein when the third indication indicates that the second spatial relationship indication should be used for a limited duration, the apparatus comprises means for receiving a sixth indication indicating a duration for using the second spatial relationship indication and / or the first spatial relationship indication, and the means for using the received indication comprises using the second spatial relationship indication and / or the first spatial relationship indication for the limited duration.

5. An apparatus for an access node, comprising: means for transmitting, to the terminal, a first spatial relationship indication for a first transmission to be in a first direction; means for transmitting to the terminal a second spatial relationship indication for a second transmission to be in a second direction; means for transmitting to the terminal a third indication indicating whether the second spatial relationship indication should be used for a limited duration; means for using the transmitted indication for receiving and / or transmitting signaling to and from the terminal; means for transmitting, from the at least one access node, a fourth indication indicating whether the second spatial relationship indication should be applied to transmissions made in the second direction on resources that are part of the same resource group as resources on which the second transmissions are made; and Equipped with When the third indication indicates that the second spatial relationship indication should be used for a limited duration, the apparatus comprises means for transmitting a sixth indication indicating a number of transmissions to be made using the second spatial relationship indication and / or the first spatial relationship indication, and the means for using the received indications includes using the second spatial relationship indication and / or the first spatial relationship indication for the limited duration.

6. 6. The apparatus of claim 5, comprising: means for determining an auxiliary spatial relationship for at least one transmission in the second direction; and means for using the determined auxiliary spatial relationship for the at least one transmission after using the second spatial relationship.

7. 7. The apparatus of claim 5 or 6, comprising means for transmitting to the terminal a fifth indication indicating a third spatial relationship to be used for a third transmission in the second direction.

8. 8. The apparatus of claim 5, wherein when the third indication indicates that the second spatial relationship indication should be used for a limited duration, the apparatus comprises means for transmitting a sixth indication indicating a duration for using the second spatial relationship indication and / or the first spatial relationship indication, and the means for using the received indication comprises using the second spatial relationship indication and / or the first spatial relationship indication for the limited duration.

9. The apparatus of any one of claims 1 to 8, wherein the second indication indicates that the first spatial relationship indication should also be used for transmission in the second direction.

10. The apparatus of any one of claims 1 to 9, wherein the third indication further indicates whether the first spatial relationship indication should be used for the limited duration or not.

11. 11. The apparatus of claim 1, wherein when the third indication indicates that the second spatial relationship indication should be used for a limited duration, the apparatus comprises means for using a fourth spatial relationship for transmission in the second direction after expiry of the limited duration, the fourth spatial relationship also being used for transmission in the second direction before the second spatial relationship was used.

12. The apparatus of any one of claims 1 to 11, wherein the first indication and the second indication are represented by a single code point.

13. The apparatus of any one of claims 1 to 11, wherein the first indication and the second indication are represented by respective code points.

14. A method for an apparatus for a terminal, comprising: receiving a first spatial relationship indication from the at least one access node for a first transmission to occur in a first direction; receiving a second spatial relationship indication from the at least one access node for a second transmission to be in a second direction; receiving a third indication from the at least one access node indicating whether the second spatial relationship indication should be used for a limited duration; and using the received indication for receiving and / or transmitting signaling with the at least one access node; and transmitting, from the at least one access node, a fourth indication indicating whether the second spatial relationship indication should be applied to transmissions made in the second direction on resources that are part of the same resource group as resources on which the second transmission is made; and Including, When the third indication indicates that the second spatial relationship indication should be used for a limited duration, the device comprises means for transmitting a sixth indication indicating a number of transmissions to be made using the second spatial relationship indication and / or the first spatial relationship indication, and the means for using the received indications includes using the second spatial relationship indication and / or the first spatial relationship indication for the limited duration.

15. A method for an apparatus for an access node, comprising: transmitting, to the terminal, a first spatial relationship indication for a first transmission to be in a first direction; transmitting, to the terminal, a second spatial relationship indication for a second transmission to be in a second direction; transmitting to the terminal a third indication indicating whether the second spatial relationship indication should be used for a limited duration; and using the transmitted indication for receiving and / or transmitting signaling to and from the terminal; Including, When the third indication indicates that the second spatial relationship indication should be used for a limited duration, the apparatus comprises means for transmitting a sixth indication indicating a number of transmissions to be made using the second spatial relationship indication and / or the first spatial relationship indication, and the means for using the received indications includes using the second spatial relationship indication and / or the first spatial relationship indication for the limited duration.

16. A computer program, which when activated by at least one processor of a device for a terminal, causes the terminal to: receiving a first spatial relationship indication from the at least one access node for a first transmission to occur in a first direction; receiving a second spatial relationship indication from the at least one access node for a second transmission to be in a second direction; receiving a third indication from the at least one access node indicating whether the second spatial relationship indication should be used for a limited duration; and using the received indication for receiving and / or transmitting signaling with the at least one access node; and transmitting, from the at least one access node, a fourth indication indicating whether the second spatial relationship indication should be applied to transmissions made in the second direction on resources that are part of the same resource group as resources on which the second transmission is made. Let them do so, When the third indication indicates that the second spatial relationship indication should be used for a limited duration, the apparatus comprises means for transmitting a sixth indication indicating a number of transmissions to be made using the second spatial relationship indication and / or the first spatial relationship indication, and the means for using the received indications includes using the second spatial relationship indication and / or the first spatial relationship indication for the limited duration.

17. A computer program, which when operating at least one processor of an apparatus for an access node, causes the access node to: transmitting, to the terminal, a first spatial relationship indication for a first transmission to be in a first direction; transmitting, to the terminal, a second spatial relationship indication for a second transmission to be in a second direction; transmitting to the terminal a third indication indicating whether the second spatial relationship indication should be used for a limited duration; and using the transmitted indication for receiving and / or transmitting signaling to and from the terminal; Let them do so, When the third indication indicates that the second spatial relationship indication should be used for a limited duration, the apparatus comprises means for transmitting a sixth indication indicating a number of transmissions to be made using the second spatial relationship indication and / or the first spatial relationship indication, and the means for using the received indications includes using the second spatial relationship indication and / or the first spatial relationship indication for the limited duration.

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