Indication of beam obstruction in multiple transmit-receive point operation

Abstract

A method is disclosed that includes detecting a beam failure at at least one transmitting / receiving point of a plurality of transmitting / receiving points. One or more beam failure indication data are included in a first medium access control (MAC) control element (CE), the one or more beam failure indication data indicating a beam failure detected on the at least one transmitting / receiving point. The one or more beam failure indication data comprises at least a first bit comprising a first value and a second value, the first value of the first bit indicating at least a first transmitting / receiving point at which a beam failure is detected. The first MAC CE comprising the one or more beam failure indication data is transmitted to an access point.

Description

[Technical field]

[0001] The following embodiments relate to wireless communications. [Background technology]

[0002] Some wireless communication networks may utilize multiple transmit-receive point operation. It is desirable to provide a solution that enhances the overall effectiveness of such capabilities. For example, it may be beneficial to provide a solution for beam failure recovery in multiple transmit-receive point operation. Summary of the Invention

[0003] The scope of protection sought for the various exemplary embodiments is indicated by the independent claims. The exemplary embodiments and features described herein that do not fall within the scope of the independent claims, if any, should be interpreted as examples useful for understanding the various exemplary embodiments.

[0004] According to one aspect, an apparatus is provided comprising at least one processor and at least one memory including computer program code, the at least one memory and the computer program code configured to cause the apparatus to perform, using the at least one processor, the steps of detecting beam failure on at least one transmitting / receiving point of a plurality of transmitting / receiving points, the apparatus being configured to communicate with the plurality of transmitting / receiving points; including one or more beam failure indication data in a first medium access control (MAC) control element (CE), the one or more beam failure indication data indicating a beam failure detected on the at least one transmitting / receiving point, the one or more beam failure indication data comprising at least a first bit having a first value and a second value, the first value of the first bit indicating at least a first transmitting / receiving point at which beam failure is detected; and transmitting the first MAC CE comprising the one or more beam failure indication data to an access point.

[0005] In one embodiment, the second value of the first bit indicates that no beam obstruction is detected on at least the first transmitting / receiving point.

[0006] In one embodiment, the second value of the first bit indicates a second transmit-receive point at which a beam obstruction is detected.

[0007] In one embodiment, the one or more beam impairment indication data further comprise at least a first set of candidate beam information associated with the first transmitting and receiving point and / or a second set of candidate beam information associated with the second transmitting and receiving point.

[0008] In one embodiment, when the first bit is set to a first value, the first set of candidate beam information is included in the first MAC CE before including the second set of candidate beam information in the first MAC CE.

[0009] In one embodiment, the first bit is set to a first value, and the one or more beam obstruction indication data further comprises at least a second bit indicating whether a beam obstruction is detected on the second transmitting reception point.

[0010] In one embodiment, the one or more beam obstruction indication data further indicate whether the beam obstruction is for a beam obstruction at a transmitting reception point level or for a beam obstruction at a cell level.

[0011] In one embodiment, the transmitting / receiving point level beam failure or cell level beam failure is indicated by a bitmap in one or more beam failure indication data, the length of the bitmap being determined at least in part based on the number of serving cells in which the beam failure is detected.

[0012] In one embodiment, the apparatus further causes the access point to transmit a second medium access control (MAC) control element (CE) indicating a cell level beam failure.

[0013] According to another aspect, an apparatus is provided comprising means for detecting a beam failure at at least one transmitting / receiving point of a plurality of transmitting / receiving points, the apparatus being configured to communicate with the plurality of transmitting / receiving points; including one or more beam failure indication data in a first medium access control (MAC) control element (CE), the one or more beam failure indication data indicating a beam failure detected on the at least one transmitting / receiving point, the one or more beam failure indication data comprising at least a first bit comprising a first value and a second value, the first value of the first bit indicating at least a first transmitting / receiving point at which a beam failure is detected; and transmitting the first MAC CE comprising the one or more beam failure indication data to an access point.

[0014] According to another aspect, a method is provided comprising: detecting, by a terminal device, a beam failure at at least one transmitting / receiving point of a plurality of transmitting / receiving points, the terminal device being configured to communicate with the plurality of transmitting / receiving points; including, by the terminal device, one or more beam failure indication data in a first medium access control (MAC) control element (CE), the one or more beam failure indication data indicating a beam failure detected on the at least one transmitting / receiving point, the one or more beam failure indication data comprising at least a first bit comprising a first value and a second value, the first value of the first bit indicating at least a first transmitting / receiving point at which a beam failure is detected; and transmitting, by the terminal device, the first MAC CE comprising the one or more beam failure indication data to an access point.

[0015] According to another aspect, a computer program is provided comprising instructions that cause an apparatus to perform at least the steps of detecting a beam failure on at least one transmitting / receiving point of a plurality of transmitting / receiving points, the apparatus being configured to communicate with the plurality of transmitting / receiving points; including one or more beam failure indication data in a first Medium Access Control (MAC) Control Element (CE), the one or more beam failure indication data indicating a beam failure detected on the at least one transmitting / receiving point, the one or more beam failure indication data comprising at least a first bit having a first value and a second value, the first value of the first bit indicating at least a first transmitting / receiving point at which a beam failure is detected; and transmitting the first MAC CE comprising the one or more beam failure indication data to an access point.

[0016] According to another aspect, a computer-readable medium is provided comprising program instructions for causing an apparatus to perform at least the steps of detecting a beam failure on at least one transmitting / receiving point of a plurality of transmitting / receiving points, the apparatus being configured to communicate with the plurality of transmitting / receiving points; including one or more beam failure indication data in a first medium access control (MAC) control element (CE), the one or more beam failure indication data indicating a beam failure detected on the at least one transmitting / receiving point, the one or more beam failure indication data comprising at least a first bit having a first value and a second value, the first value of the first bit indicating at least a first transmitting / receiving point at which a beam failure is detected; and transmitting the first MAC CE comprising the one or more beam failure indication data to an access point.

[0017] According to another aspect, a non-transitory computer-readable medium is provided comprising program instructions to cause an apparatus to perform at least the steps of detecting a beam failure on at least one transmitting / receiving point of a plurality of transmitting / receiving points, the apparatus being configured to communicate with the plurality of transmitting / receiving points; including one or more beam failure indication data in a first medium access control (MAC) control element (CE), the one or more beam failure indication data indicating a beam failure detected on the at least one transmitting / receiving point, the one or more beam failure indication data comprising at least a first bit having a first value and a second value, the first value of the first bit indicating at least a first transmitting / receiving point at which a beam failure is detected; and transmitting the first MAC CE comprising the one or more beam failure indication data to an access point.

[0018] According to another aspect, an apparatus is provided comprising at least one processor and at least one memory including computer program code, the at least one memory and the computer program code configured to cause the apparatus, using the at least one processor, to perform a step of receiving, from a terminal device, a Medium Access Control (MAC) control element (CE) comprising at least a first bit having a first value and a second value, wherein the first value of the first bit indicates a beam obstruction on at least a first transmitting reception point.

[0019] According to another aspect, an apparatus is provided comprising means for receiving, from a terminal device, a Medium Access Control (MAC) control element (CE) comprising at least a first bit having a first value and a second value, the first value of the first bit indicating a beam failure at least at a first transmitting reception point.

[0020] According to another aspect, a method is provided comprising receiving, from a terminal device, a Medium Access Control (MAC) control element (CE) comprising at least a first bit having a first value and a second value, the first value of the first bit indicating a beam failure at least at a first transmission reception point.

[0021] According to another aspect, a computer program product is provided comprising instructions for causing an apparatus to perform at least a step of receiving, from a terminal device, a Medium Access Control (MAC) Control Element (CE) comprising at least a first bit having a first value and a second value, the first value of the first bit indicating a beam obstruction on at least a first transmitting reception point.

[0022] According to another aspect, a computer-readable medium is provided comprising program instructions for causing an apparatus to perform at least the steps of receiving, from a terminal device, a Medium Access Control (MAC) control element (CE) comprising at least a first bit having a first value and a second value, the first value of the first bit indicating a beam obstruction on at least a first transmitting reception point.

[0023] According to another aspect, a non-transitory computer-readable medium is provided comprising program instructions for causing an apparatus to perform at least the steps of receiving, from a terminal device, a Medium Access Control (MAC) Control Element (CE) comprising at least a first bit having a first value and a second value, the first value of the first bit indicating a beam obstruction on at least a first transmitting reception point.

[0024] According to another aspect, a system is provided comprising at least a terminal device and an access point. The terminal device detects a beam failure on at least one transmission reception point of a plurality of transmission reception points, the terminal device is configured to communicate with the plurality of transmission reception points, includes one or more beam failure indication data in a first medium access control (MAC) control element (CE), the one or more beam failure indication data indicates a beam failure detected on the at least one transmission reception point, the one or more beam failure indication data comprises at least a first bit comprising a first value and a second value, the first value of the first bit indicates at least a first transmission reception point where a beam failure is detected, and transmits a first MAC CE comprising the one or more beam failure indication data to the access point. The access point receives the MAC CE comprising the one or more beam failure indication data from the terminal device.

[0025] According to another aspect, a system is provided comprising at least a terminal device and an access point. The terminal device comprises means for detecting a beam failure at at least one transmitting reception point of a plurality of transmitting reception points, the terminal device being configured to communicate with the plurality of transmitting reception points, including one or more beam failure indication data in a first medium access control (MAC) control element (CE), the one or more beam failure indication data indicating a beam failure detected on the at least one transmitting reception point, the one or more beam failure indication data comprising at least a first bit comprising a first value and a second value, the first value of the first bit indicating at least a first transmitting reception point at which a beam failure is detected, and transmitting the first MAC CE comprising the one or more beam failure indication data to the access point. The access point comprises means for receiving the MAC CE comprising the one or more beam failure indication data from the terminal device.

[0026] Various exemplary embodiments are described in more detail below with reference to the accompanying drawings. [Brief description of the drawings]

[0027] [Figure 1A] FIG. 1A illustrates an exemplary embodiment of a cellular communication network. [Figure 1B] FIG. 1B illustrates an exemplary embodiment of a cellular communication network. [Diagram 2] FIG. 2 shows a beam failure recovery medium access control control element with a single octet bitmap. [Diagram 3] FIG. 3 shows a signaling diagram according to another exemplary embodiment. [Figure 4] FIG. 4 illustrates a media access control element according to some example embodiments. [Diagram 5] FIG. 5 illustrates a media access control element according to some example embodiments. [Figure 6] FIG. 6 illustrates a flow chart according to some example embodiments. [Figure 7] FIG. 7 illustrates a flowchart according to some example embodiments. [Figure 8] FIG. 8 illustrates a flowchart according to some example embodiments. [Figure 9] FIG. 9 illustrates a flowchart according to some example embodiments. [Figure 10] FIG. 10 illustrates an apparatus according to some example embodiments. [Figure 11] FIG. 11 illustrates an apparatus according to some example embodiments. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0028] The following embodiments are illustrative. Although the specification may refer to "an," "one," or "some" embodiments in several places in the text, this does not necessarily mean that each reference is to the same embodiment or that a particular feature applies only to a single embodiment. Single features of different embodiments may be combined to provide other embodiments.

[0029] In the following, various embodiments are described using radio access architectures based on Long Term Evolution Advanced (LTE-A) or New Radio (NR, 5G) as examples of access architectures to which the exemplary embodiments may be applied, without limiting the exemplary embodiments to such architectures. As will be clear to those skilled in the art, the exemplary embodiments may also be applied to other types of communication networks having suitable means by appropriately adjusting parameters and procedures. Some examples of other options for a suitable system may be Universal Mobile Telecommunications System (UMTS) Radio Access Network (UTRAN or E-UTRAN), Long Term Evolution (LTE, substantially the same as E-UTRA), Wireless Local Area Network (WLAN or Wi-Fi), Worldwide Interoperability for Microwave Access (WiMAX), Bluetooth, Personal Communications Services (PCS), ZigBee, Wideband Code Division Multiple Access (WCDMA), systems using ultra-wideband (UWB) technology, sensor networks, Mobile Ad-Hoc Networks (MANET), and Internet Protocol Multimedia Subsystem (IMS), or any combination thereof.

[0030] FIG. 1A shows an example of a simplified system architecture showing several elements and functional entities, all of which are logical units, whose implementation may differ from those shown. The connections shown in FIG. 1A are logical connections, but the actual physical connections may differ. It will be apparent to one skilled in the art that the system may also include functions and structures other than those shown in FIG. 1A.

[0031] However, the exemplary embodiment is not limited to the system given as an example, and a person skilled in the art can apply the solution to other communication systems that have the required characteristics.

[0032] The example of FIG. 1A illustrates a portion of an exemplary radio access network.

[0033] 1A shows user devices 100, 102 configured to be wirelessly connected over one or more communication channels in a cell with an access node (e.g., (e / g)NodeB) 104 serving the cell. The physical link from the user device to the (e / g)NodeB may be referred to as an uplink or reverse link, and the physical link from the (e / g)NodeB to the user device may be referred to as a downlink or forward link. It should be understood that the (e / g)NodeB or their functionality may be implemented by using any node, host, server or access point, etc. entity suitable for such use.

[0034] The communication system may comprise multiple (e / g)NodeBs, in which case the (e / g)NodeBs may also be configured to communicate with each other via wired or wireless links designed for that purpose. These links may be used for signaling purposes. The (e / g)NodeB may be a computing device configured to control radio resources of the communication system to which it is coupled. The NodeB may also be called a base station, an access point or any other type of interface device including a relay station capable of operating in a wireless environment. The (e / g)NodeB may include or be coupled to a transceiver. A connection may be provided from the transceiver of the (e / g)NodeB to an antenna unit that establishes a bidirectional radio link to a user device. The antenna unit may comprise multiple antennas or antenna elements. The (e / g)NodeB may be further connected to a core network 110 (CN or Next Generation Core (NGC)). Depending on the system, the counterpart on the CN side may be a Serving Gateway (S-GW, which routes and forwards user data packets), a Packet Data Network Gateway (P-GW) for providing connectivity of a User Device (UE) to an external packet data network, or a Mobile Management Entity (MME), etc.

[0035] A user device (also referred to as UE, user equipment, user terminal, terminal device, etc.) denotes one type of device to which resources over the air interface may be allocated and assigned, and thus any features described herein with respect to a user device may be implemented in a corresponding device such as a relay node. An example of such a relay node may be a Layer 3 relay (self-backhauled relay) towards a base station.

[0036] A user device may refer to a portable computing device, including wireless mobile communication devices that operate with or without a subscriber identity module (SIM), including, but not limited to, mobile stations (cell phones), smartphones, personal digital assistants (PDAs), handsets, devices that use wireless modems (such as alarms or measuring devices), laptops and / or touch screen computers, tablets, game consoles, notebooks, and multimedia devices. It should be understood that a user device may also be an almost exclusively uplink-only device, an example of which may be a camera or video camera that loads images or video clips onto the network. A user device may also be a device capable of operating in an Internet of Things (IoT) network, a scenario in which an object may be provided with the ability to transfer data over a network without the need for human-to-human or human-to-computer interaction. A user device may also utilize the cloud. In some applications, a user device may comprise a small portable device with a radio part (such as a watch, earphones, or glasses), and computations may be performed in the cloud. A user device (or in some exemplary embodiments a Layer 3 relay node) may be configured to perform one or more of the user equipment functions. A user device may also be called a subscriber unit, mobile station, remote terminal, access terminal, user terminal, terminal device, or user equipment (UE), although it includes several names or devices.

[0037] The various techniques described herein may also be applied to cyber-physical systems (CPS), systems that cooperate with computational elements to control physical entities. CPS may enable the implementation and utilization of a large number of interconnected ICT devices (sensors, actuators, processors, microcontrollers, etc.) embedded in physical objects at different locations. Mobile cyber-physical systems, where the physical systems in question may have inherent mobility, are a subcategory of cyber-physical systems. Examples of mobile physical systems include mobile robots and electronic devices transported by humans or animals.

[0038] Furthermore, although the apparatus is shown as a single entity, different units, processors and / or memory units (not all of which are shown in FIG. 1A) may be implemented.

[0039] 5G may allow the use of multiple-input multiple-output (MIMO) antennas, many more base stations or nodes than LTE (so-called small cell concept), including macro sites that work in cooperation with smaller stations and use different radio technologies depending on the service needs, use cases, and / or available spectrum. 5G mobile communications may support a wide range of use cases and related applications, including video streaming, augmented reality, different ways of data sharing, and various forms of machine-type applications (such as (high capacity) machine-type communications (mMTC)), including vehicle safety, different sensors, and real-time control. 5G may have multiple air interfaces, namely sub-6 GHz, cmWave, and mmWave, and may also be expected to be integrable with existing legacy radio access technologies such as LTE. Integration with LTE may be implemented as a system, at least in the initial stages, where macro coverage may be provided by LTE and 5G air interface access may come from small cells by aggregation to LTE. In other words, 5G can support both inter-RAT operation (such as LTE-5G) and inter-RI operation (sub-6GHz-cmWave, sub-6GHz-cmWave, mmWave, etc., inter-air interface operation). One concept likely to be used in 5G networks may be network slicing, where multiple independent and dedicated virtual sub-networks (network instances) may be created within substantially the same infrastructure to run services with different requirements for latency, reliability, throughput and mobility.

[0040] The current architecture in LTE networks may be fully distributed in the radio or fully centralized in the core network. Low latency applications and services in 5G may require content to be closer to the radio, which leads to local breakout and multi-access edge computing (MEC). 5G may allow analytics and knowledge generation to take place at the source of the data. This approach may require leveraging resources that may not be continuously connected to the network, such as laptops, smartphones, tablets, and sensors. MEC can provide a distributed computing environment for application and service hosting. It may also have the ability to store and process content in close proximity to the cellular subscriber for faster response times. Edge computing can cover a wide range of technologies such as wireless sensor networks, mobile data acquisition, mobile signature analysis, collaborative distributed peer-to-peer ad-hoc networking and processing which can also be categorized as local cloud / fog computing and grid / mesh computing, due computing, mobile edge computing, cloudlets, distributed data storage and retrieval, autonomous self-healing networks, remote cloud services, augmented and virtual reality data caching, Internet of Things (massive connectivity and / or latency critical), critical communications (autonomous vehicles, road safety, real-time analytics, time-critical control, healthcare applications), etc.

[0041] The communications system may also be capable of communicating with, or using services provided by, other networks, such as the public switched telephone network or the Internet 112. The communications network may also be capable of supporting the use of cloud services, e.g., at least a portion of the core network operations may be performed as a cloud service (this is illustrated in FIG. 1A by "the cloud" 114). The communications system may also comprise a central control entity, etc., that provides facilities for networks of different operators to cooperate, e.g., in spectrum sharing.

[0042] Edge cloud may be brought to the radio access network (RAN) by utilizing network function virtualization (NFV) and software-defined networking (SDN). Using edge cloud may mean that access node operations are performed at least in part in a server, host, or node operably coupled to a remote radio head or radio unit (RU), or a base station comprising a radio part. Node operations may also be able to be distributed among multiple servers, nodes, or hosts. Performing RAN real-time functions on the RAN side (in the distributed unit (DU) 104) and non-real-time functions in a centralized manner (in the centralized unit (CU) 108) may be enabled, for example, by the application of cloudRAN architecture.

[0043] It should also be understood that the distribution of work between core network operations and base station operations may be different from that of LTE or may even not exist. Some other technological advances that may be used may be big data and all-IP, which may change the way networks are built and managed. 5G (or new radio (NR)) networks may be designed to support multiple hierarchies, and MEC servers may be located between the core and base stations or nodeBs (gNBs). It should be understood that MEC may also be applied in 4G networks.

[0044] 5G can also utilize satellite communications to extend or complement the coverage of 5G services, for example by providing backhaul. Possible use cases can be to provide service continuity to machine-to-machine (M2M) or Internet of Things (IoT) devices or passengers aboard vehicles, or to ensure service availability for critical communications and future rail / maritime / aeronautical communications. Satellite communications can utilize geostationary Earth orbit (GEO) satellite systems, but also low Earth orbit (LEO) satellite systems, especially mega-constellations (systems in which many (nano)satellites are deployed). At least one satellite 106 in the mega-constellation can cover several satellite-enabled network entities creating ground cells. The ground cells can be created via terrestrial relay nodes 104 or by gNBs located on the ground or in the satellites.

[0045] It is clear to those skilled in the art that the illustrated system is just an example of a part of a radio access system, and in reality the system may comprise multiple (e / g)NodeBs, a user device may have access to multiple radio cells, and the system may also comprise other devices, such as physical layer relay nodes or other network elements, at least one of which may be a (e / g)NodeB, or a Home(e / g)nodeB.

[0046] Furthermore, the (e / g)nodeB or base station may be divided into radio units (RU) with radio transceivers (TRX), i.e. transmitters (TX) and receivers (RX), distributed units (DU) that may be used for so-called Layer 1 (L1) processing and real-time Layer 2 (L2) processing, and centralized units (CU) or central units that may be used for non-real-time L2 and Layer 3 (L3) processing. Such a division may allow centralization of the CU to the cell site and the DU, but the DU may be more distributed and remain at the cell site. Both the CU and the DU may also be called baseband or baseband unit (BBU). The RU and the DU may also be included in a radio access point (RAP). A cloud computing platform may also be used to run the CU or the DU. The CU may run on the cloud computing platform (virtualized CU (vCU)). In addition to the vCU, there may also be a virtualized DU (vDU) running on the cloud computing platform. Furthermore, there may be combinations in which the DU may use so-called bare metal solutions, such as application specific integrated circuits (ASICs) or customer specific standard products (CSSPs) system-on-chip (SoC) solutions. It should also be understood that the distribution of work between the base station units described above, or the different core network operations and base station operations, may differ.

[0047] Also, a geographical area of ​​a wireless communication system may be provided with not only a plurality of radio cells, but also a plurality of radio cells of different types. The radio cells may be macrocells (or umbrella cells), which may be large cells with a diameter up to several tens of kilometers, or smaller cells such as microcells, femtocells, or picocells. The (e / g)NodeBs of FIG. 1A may provide any type of these cells. The cellular wireless system may be implemented as a multi-layer network including several types of cells. In a multi-layer network, one access node may provide one type of cell, and therefore multiple (e / g)NodeBs may be required to provide such a network structure.

[0048] To meet the need to improve the deployment and performance of communication systems, the concept of "plug-and-play" (e / g) NodeB can be introduced. A network that can use "plug-and-play" (e / g) NodeB can include a home nodeB gateway (HNB-GW) (not shown in FIG. 1A) in addition to the Home(e / g)NodeB (H(e / g)nodeB). The HNB gateway (HNB-GW), which can be installed in an operator's network, can aggregate traffic from multiple HNBs back to the core network.

[0049] If the UE is experiencing poor channel conditions, the UE may experience beam failure. However, the UE may be able to perform beam failure recovery (BFR), for example, by using contention-free random access (CFRA) or contention-based random access (CBRA). In CFRA BFR, the UE may be provided with a specific downlink (DL) reference signal (RS), i.e., a dedicated random access (RA) preamble resource that may correspond to a new candidate beam. Thus, the CFRA BFR may indicate to the network that a beam failure has been declared and that the UE has initiated recovery and selected a new candidate beam.

[0050] In a secondary cell (SCell) BFR, the UE may perform beam failure detection for one or more SCells configured for beam failure detection. This may be similar to primary cell (PCell) failure detection, and for a given SCell configured for failure detection, the UE implicitly or explicitly determines a set of q0 and / or a respective set of beam failure detection resources such as beam failure detection reference signals (BFD-RS). In an implicit configuration, the UE may determine the BFD-RS based on a reference signal indicated by an active transmission configuration indicator (TCI) state for a physical downlink control channel (PDCCH). In an explicit configuration, the UE may perform beam failure detection according to a reference signal configured by the network.

[0051] The physical layer, i.e., L1, decides whether to indicate a beam failure instance (BFI) to a higher layer, i.e., a medium access control (MAC) layer, sometimes referred to as L2, based on downlink reference signals, such as a synchronization signal block (SSB) or a SS / PBCH (synchronization signal / physical broadcast channel) block or a channel state information reference signal (CSI-RS), in a set of q0. When all reference signals in the set of q0 are in a failure state, i.e., when a hypothetical PDCCH block error rate (BLER) estimated on the reference signals is above a threshold, e.g., 10%, denoted as Qout, the UE indicates a BFI to the higher layer.

[0052] The MAC layer counts the BFI indications for a given cell in a BFI counter and initiates or triggers beam failure recovery when it counts the configured number of BFI instances indicated by the lower layers for the respective cell (PCell or SCell). The counter for BFI indication is monitored by a Beam Failure Detection (BFD) timer. When the UE receives a new BFI indication, the BFD timer is started and the counter is incremented. If the BFD timer expires, the counter is reset.

[0053] For SCell beam failure recovery, when detecting beam failure on at least one SCell, the UE may recover the failed cell by transmitting a MAC Control Element (MAC CE) indicating the failure and which may also be referred to as a BFR MAC CE. Note that when BFR MAC CE is referenced, it may refer to a BFR MAC CE, or a shortened BFR MAC CE, or a MAC CE used for beam failure recovery. Figure 2 shows an example of a BFR and a shortened BFR MAC CE with a single octet bitmap. Figure 2 is used as an example to explain some of the features and data structures of a BFR MAC CE that may be utilized in the context of some exemplary embodiments.

[0054] The BFR MAC CE indicates to the network the failed SCell index (illustrated as C1-C7 in FIG. 2), an indication of whether the candidate beam is available (illustrated as AC bits in FIG. 2), and the index of the candidate beam in the candidate beam RS list (candidate RS ID in FIG. 2, if any). The candidate beam RS list is a list of candidate beam indexes, which may be SSB and / or CSI-RS indexes. A candidate beam may be determined to be available, for example, if the quality and / or received signal strength of the candidate beam exceeds a threshold level. The MAC CE indicating SCell failure and / or recovery information may also be used for PCell recovery by setting a PCell bit (illustrated as SP bit in FIG. 2) to indicate failure.

[0055] The MAC CE transmission may be preceded by a dedicated RS signal transmission that may indicate a beam failure event on the SCell. Alternatively or additionally, the UE may multiplex the BFR MAC CE in any available uplink (UL) grant.

[0056] For example, the MAC CE described below may be used to indicate a special cell (SpCell) failure. SpCell may mean a primary cell of a master cell group or a primary secondary cell of a secondary cell group. It is further noted that a primary cell (PCell) may refer to an SpCell of a master cell group, and a primary secondary cell (PSCell) may refer to an SpCell of a secondary cell group.

[0057] The BFR MAC CE may be identified by a MAC subheader with a logical channel identifier (LCID / eLCID). The BFR MAC CE may have a variable size. It may comprise a bitmap in ascending order based on the ServCellIndex and the octet containing the beam failure recovery information, i.e., the candidate beam availability indication (AC bit), for the SCell indicated in the bitmap.

[0058] For BFR MAC CE, a single octet bitmap may be used when the highest ServCellIndex of the SCell of this MAC entity where beam failure is detected is less than 8. Otherwise, 4 octets may be used.

[0059] In the case of abbreviated BFR MAC CE, a single octet bitmap (eg, as illustrated in FIG. 2) may be used, for example, for the following cases: The highest ServCellIndex of any SCell of this MAC entity configured with beam failure detection is less than 8. A beam failure is detected for an SpCell, the SpCell is indicated in a shortened BFR MAC CE, and the uplink shared channel (UL-SCH) resources available for transmission cannot accommodate the truncated BFR MAC CE with a 4-octet bitmap and its subheader as a result of logical channel prioritization (LCP).

[0060] The fields in the BFR MAC CE may be defined as follows with reference to FIG.

[0061] SP: This field may indicate beam failure detection for the SpCell of this MAC entity. The SP field may be set to 1 to indicate that beam failure has been detected for the SpCell if a BFR MAC CE or abbreviated BFR MAC CE is included in the MAC Protocol Data Unit (PDU) as part of the random access procedure. Otherwise, it is set to 0.

[0062] Ci (BFR MAC CE): This field may indicate beam failure detection and the presence of an octet containing an AC field for a SCell with ServCellIndex i. A Ci field set to 1 indicates that beam failure is detected and an octet containing an AC field is present for a SCell with ServCellIndex i. A Ci field set to 0 indicates that beam failure is not detected and an octet containing an AC field is not present for a SCell with ServCellIndex i. The octets containing the AC field are present in ascending order based on ServCellIndex.

[0063] Ci (Abbreviated BFR MAC CE): This field indicates beam failure detection for the SCell with ServCellIndex i. A Ci field set to 1 indicates that beam failure is detected and an octet containing an AC field for the SCell with ServCellIndex i may be present. A Ci field set to 0 indicates that beam failure is not detected and an octet containing an AC field is not present for the SCell with ServCellIndex i. Octets containing AC fields, if present, are included in ascending order based on ServCellIndex. The number of octets containing AC fields included is maximized without exceeding the available grant size.

[0064] AC (Available Candidate): This field may indicate the presence of a candidate RS ID field in this octet. If at least one of an SSB with a synchronization signal reference signal received power (SS-RSRP) exceeding RSRP-ThresholdBFR among the SSBs in the candidateBeamRSSCellList or a CSI-RS with a CSI-RSRP exceeding RSRP-ThresholdBFR among the CSI-RSs in the candidateBeamRSSCellList is available, the AC field is set to 1, otherwise it is set to 0. If the AC field is set to 1, the candidate RS ID field is present. If the AC field is set to 0, the R bit is present instead.

[0065] Candidate RS ID: This field is set to the index of the SSB in the candidateBeamRSSCellList that has an SS-RSRP that exceeds rsrp-ThresholdBFR, or the index of the CSI-RS in the candidateBeamRSSCellList that has a CSI-RSRP that exceeds rsrp-ThresholdBFR. The length of this field is 6 bits.

[0066] R: Reserved bits may be set to 0.

[0067] A network (e.g., the network shown in FIG. 1A) may further support utilizing multiple transmit reception points (TRPs), which may be referred to as multiple transmit reception points (mTRPs). An mTRP operation may support, for example, two or more TRPs. Thus, for example, a UE 100, 102 may receive data via multiple TRPs. The different TRPs may be controlled by an access point 104, such as, for example, a gNB.

[0068] An example of such a system is shown in Figure 1B, which can be understood to show the system of Figure 1A, but with more precision for the mTRP scenario. mTRP operation can be implemented such that instead of explicitly indicating a TRP identifier (ID), a control resource set (CORESET) can be associated with a specific TRP using the CORESETPoolIndex parameter [0.1]. CORESETs in a PDCCH configuration with the same poolIndex can be assumed by the UE to be configured to be served from the same (set of) TRP. Referring to FIG. 1B, two TRPs with CORESETPoolIndex0 and 1 are shown. TRP0, i.e., a TRP with CORESETPoolIndex0, provides three beams (RS#1, RS#2, and RS#3), and TRP1, i.e., a TRP with CORESETPoolIndex1, provides two beams (RS#4 and RS#5). Note that FIG. 1B is a non-limiting example. In some examples, TRP0 and / or TRP1 may include one or more TRPs.

[0069] The mTRP may also be configured for inter-cell scenarios (sometimes referred to as inter-cell mTRP), i.e., the TRP may be associated with different cells. In inter-cell mTRP, the UE may be provided with a configuration in which the CORESETPoolIndex / CORESET of the TRP is provided by multiple cells (e.g., two). In some examples, the UE may be explicitly configured with CORESETs with more than one (e.g., two) distinct CORESETPoolIndex values, where the CORESETs or CORESETPoolIndex are associated with another cell other than the current serving cell, e.g., associating the CORESET / Pool index with a physical cell identity (PCI). In some examples, the UE may determine that the UE is configured with inter-cell mTRP communication if the downlink reference signal indicated by the activated TCI state for the PDCCH or the physical downlink shared channel (PDSCH) for the CORESET is associated, or if the quasi-co-location (QCL) source of the signal is associated with a PCI other than the current serving cell. These are understood as illustrative examples.

[0070] Here, mTRP operation can mean single-downlink control information (S-DCI) or multiple-downlink control information (mDCI) operation. In mDCI operation, CORESETPoolIndex value can be used to group CORESETs under separate groups. In other words, if CORESETs share the same group ID or CORESETPoolindex value, they can be considered to be in the same group. In S-DCI operation, different CORESETs are not grouped, i.e., the same CORESETpoolindex value is configured for all CORESETs. When configured with multiple values ​​of CORESETpoolindex (e.g., two sets of CORESETs are configured in mDCI operation), the UE can be expected to simultaneously monitor downlink control information (DCI) transmissions from CORESETs associated with different poolindex values. Currently, up to two values ​​(k=0,1) can be configured.

[0071] However, currently, there may be no support for indicating multiple TRP beam failures to facilitate beam failure recovery for mTRP operations. For example, there may be a lack of an efficient and reliable notion of how to indicate to the network when at least one of the beams (e.g., RS#1, RS#2, RS#3, RS#4, or RS#5 in FIG. 1B) fails.

[0072] For example, if UE 100 (e.g., configured for PDCCH reception and / or configured for beam failure detection) is served via beams RS#1 and RS#4, and RS#1 and RS#4 are in different BFD-RS sets of q0, and beam RS#1 fails, then UE 100 may determine that it has experienced a failure or TRP failure or BFD-RS set failure on a subset of beams. This may be referred to as partial beam failure or TRP failure. When all beams (i.e., all BFD-RSs or all reference signals in the failure detection set, i.e., all sets in q0) are in a failure state, this may be referred to as complete failure or complete beam failure or cell-level beam failure.

[0073] As an example, when it is referred to herein that TRP1 has failed, it may refer to the failure of an RS in the BFD-RS set associated with TRP1. In a further example, when it is referred to herein that TRP0 has failed, it may refer to the failure of an RS in the BFD-RS set associated with TRP0. In other words, a TRP1 failure may refer to the failure of a BFD-RS set associated with a CORESET under a particular CORESETPoolIndex value (e.g., 1). Similarly, a TRP0 failure may refer to the failure of a BFD-RS set associated with a CORESET under a particular CORESETpoolIndex value (e.g., 0).

[0074] Some exemplary embodiments may be used to provide beam failure detection for mTRP operation by indicating TRP failure with or without candidate beams when the UE is configured to indicate cell-level failure, i.e., complete failure, or when the UE is configured to indicate failure on a per-TRP basis. Some exemplary embodiments may utilize signaling techniques such as MAC CE coding techniques or rules for various mTRP recovery schemes, including but not limited to signaling support indicating failure of all TRPs, signaling support indicating failure of at least one TRP, and / or signaling support indicating failure of the cell (failure on all TRPs may be interpreted by the UE as failure of the entire cell).

[0075] It should be noted that in this specification, a TRP may refer to a BFD-RS set associated with one or more specific TRPs, and a TRP-specific failure may refer to a failure of a specific q0 set. In some exemplary embodiments described below, two TRPs, i.e., two BFD-RS sets of q0, may be used as an example. However, some exemplary embodiments may also be applied to more than two TRPs.

[0076] 3 shows a signaling diagram according to an example embodiment. An access point such as a gNB configures a UE for mTRP beam failure detection (301). For example, the UE may be configured to detect one or more TRP-specific beam failures and indicate one or more TRP-specific beam failures to a base station. After detecting at least one beam failure (302), the UE may include beam failure indication data in at least a portion of a MAC CE field using the following logic, which may be configured in the UE by the access point in the configuration 301 (303).

[0077] If the first TRP (denoted as TRP0) fails, the UE may include an indication of the beam failure first detected on TRP0 by setting a first TRP failure information field indicating beam failure of TRP0. The indication may be followed by candidate beam information for TRP0. The candidate beam information may comprise, for example, an AC field and / or a candidate RS index.

[0078] If a failure of TRP0 is indicated by the first TRP failure information field, the UE may also include a second set of TRP failure information in the MAC CE. If a second TRP (denoted as TRP1) fails, the UE may indicate the failed second TRP by setting the second TRP failure information field to indicate a second beam failure. If TRP1 does not fail, the UE may set the second TRP failure information field to indicate that TRP1 does not fail.

[0079] If TRP1 fails but TRP0 does not fail, the UE may encode the TRP1 beam failure information in the first TRP failure information field. The indication may be followed by candidate beam information for TRP1. The candidate beam information may comprise, for example, an AC field and / or a candidate RS index.

[0080] If the failure information of TRP1 is coded first in the MAC CE, the second TRP information field may not be coded. If TRP1 is indicated first, the MAC CE does not indicate TRP0 failure. In other words, the above TRP failure information or octets with TRP failure information and / or AC field coding are performed for each serving cell indicated by the bitmap including the SpCell "P" bit and Ci field.

[0081] After encoding the beam failure indication data into the MAC CE, the UE transmits the MAC CE including the encoded beam failure indication data to the access point (304). The access point may then initiate a beam failure recovery procedure for the UE based on the beam failure indication data included in the received MAC CE.

[0082] In the above exemplary embodiment, the order of the TRPs encoded in the MAC CE is merely an example, and the encoding order of the TRPs may be reversed. In other words, TRP1 may be encoded first before TRP0 in the above exemplary embodiment.

[0083] In any of the example embodiments described herein, a TRP# failure may refer to a failure of the BFD-RS set associated with the BFD-RS set# or CORESETPoolIndex# or any higher layer parameter index# used to group BFD-RSs into a particular set of q0s.

[0084] FIG. 4 illustrates a MAC CE according to an example embodiment. In this example embodiment, beam failure of at least one TRP has been detected for a serving cell (e.g., SpCell, indicated by the "P" bit). In this case, the R1 bit indicates whether the failed TRP is TRP0 or TRP1. When the R1 bit is set to 1, this indicates that TRP1 has failed. When the R1 bit is set to 0, this indicates that at least TRP0 has failed. Similarly, the procedures herein may be applicable to any serving cell (e.g., SpCell and / or SCell).

[0085] When R1 is set to indicate TRP0 failure, candidate beam information (e.g., AC and / or candidate RS index) is encoded for TRP0, followed by another field (octet) for TRP1 information.

[0086] When R1 is set to indicate a TRP1 failure, the candidate beam information (e.g., AC and / or candidate RS index) is coded for TRP1, and no further octets follow since a TRP0 failure would be indicated first if one occurred.

[0087] When the R1 bit indicates a failure of TRP0 (i.e., R1 is set to 0), the R2 bit indicates whether TRP1 has failed. If the R2 bit indicates a TRP1 failure, the candidate beam information (e.g., AC and / or candidate RS index) in the second field (octet) is encoded for TRP1.

[0088] In another exemplary embodiment, the failure of a TRP may be indicated by setting a TRP-specific field in the MAC CE to a particular value. There may be one or more TRPs and TRP-specific fields. For example, if the first TRP has failed, the value of the first bit may be set to "1", otherwise the first bit may be set to "0", indicating no failure on the first TRP. As another example, if the second TRP has failed, the value of the second bit may be set to "1", otherwise the second bit may be set to "0", indicating no failure on the second TRP. As another example, if the third TRP has failed, the value of the third bit may be set to "1", otherwise the third bit may be set to "0", indicating no failure on the third TRP. In other words, for each of the TRPs, there may be a bit indicating whether the TRP has failed or not. For example, the TRP specific fields may be listed in ascending or descending order in the MAC CE, and a bit may be set in each field in the TRP information field (e.g., octet) to indicate failed or non-failed status. A TRP field may be listed for each failed serving cell indicated in the MAC CE.

[0089] Alternatively, the bitmap may comprise one or more bits or octets indicating a TRP-specific failure status (failed or not failed) for each of the indicated serving cells in the MAC CE. For example, the serving cell bit may be set to a particular value to indicate a failure in a particular serving cell. For example, a TRP-specific failure status may be indicated for each serving cell for which a failure is indicated.

[0090] FIG. 5 illustrates a MAC CE according to another exemplary embodiment, which comprises a bitmap for indicating whether a TRP-specific beam failure or a cell-level beam failure has occurred. The serving cell-specific T / S field indicates whether the UE indicates a TRP-specific failure (T) or a serving cell-level failure (S). An example of the MAC CE encoding logic of this exemplary embodiment is provided below.

[0091] In one example, the UE may indicate beam failure of at least one serving cell, for example, by using a ServCell index bitmap, and the T / S field may be set to indicate a TRP-specific beam failure. In this case, the T / S field indicates failure of one of the TRPs, and the TRP ID is encoded in the R1 bit of the candidate beam octet, i.e., the first octet comprising R1, AC, and candidate RS index. For example, the UE may be configured to indicate when one TRP is failing. Alternatively, it may indicate failure of both TRPs, using the encoding logic described above with reference to FIG. 3. Alternatively, it may indicate failure of both TRPs. In this case, both candidate beam octets (R1, AC, first candidate RS index; R2, AC, second candidate RS index) may be encoded for each indicated serving cell.

[0092] In another example, a field (e.g., the T / S field) may be set to indicate a TRP-specific beam impairment and both candidate beam octets may be encoded into the MAC CE.

[0093] In another example, a field (e.g., the T / S field) may be set to indicate a cell-level failure (e.g., both TRPs have failed) and both TRP-specific candidate beam octets may be encoded into the MAC CE.

[0094] In another example, if the UE indicates a beam failure for the (serving) cell, the UE may set the T / S field to indicate serving cell failure and the candidate beam information octet (R1, AC, candidate RS index) may be encoded for the cell. If a cell level failure occurs or is declared for the SpCell, the UE may omit the TRP-specific candidate beam information for the SpCell if MAC CE is provided using CBRA.

[0095] In another example, the length of the bitmap indicating TRP-specific or cell failure may be determined based on the number of serving cells indicating failure based on the Ci and P fields.

[0096] In some exemplary embodiments, if the UE determines that no new candidate beams are available for both or any of the failed TRPs (i.e., failure of an RS in the BFD-RS set associated with the TRP), the UE may initiate a random access procedure for beam failure recovery on the SpCell or other serving cell. In other examples, the UE may provide a MAC CE indicating an SpCell-level (or serving cell-level) failure for the serving cell (e.g., a TRP-specific failure instead) and there is no available candidate beam to indicate for the failed TRP. For example, the BFR MAC CE shown in FIG. 2 may be used to indicate a cell-level failure when there is no available candidate beam for both (or all) TRPs. This may be an implicit indication by the UE to indicate that the UE has determined that no candidate is available for the failed TRP.

[0097] Note that in this specification, BFR MAC CE may refer to abbreviated BFR MAC CE or BFR MAC CE. In one example, when a UE transmits a BFR MAC CE, it may indicate to the network that the UE is recovering a cell (instead of one or more TRPs).

[0098] In another exemplary embodiment, if the UE determines that new candidate beams are not available for both or all of the failed TRPs, the UE may set a field in the MAC CE (e.g., the T / S field) to indicate a cell-level failure. For example, when indicating a cell-level failure, the UE may omit the candidate beam information from the MAC CE for the SpCell if the MAC CE is provided using CBRA. In another example, if there are no available candidate beams for any of the failed TRPs for the SCell (or for the serving cell), the UE may indicate a cell-level failure and omit the candidate beam information field from the MAC CE. As an example, if the UE is configured for mTRP communication, when the UE indicates a serving cell-level failure using a specific field in the MAC CE, or when using the BFR MAC CE or any MAC used for beam failure recovery, the UE may implicitly indicate the failure of the TRPs and that there are no new candidate beams available for the failed TRPs. As a further example, a new candidate beam for one or more TRPs may be indicated by the DL RS (SSB or CSI-RS) selected for the random access procedure.

[0099] A UE may be configured for mTRP communication, for example, when multiple CORESETPoolIndex values ​​are configured for the UE or when multiple sets of BFD-RS are configured for the UE.

[0100] In another exemplary embodiment, if the UE determines that both TRPs are failed but at least one of the TRPs has an available candidate beam, the UE may initiate beam failure recovery for the failed TRP.

[0101] In other example embodiments, if the UE cannot detect or indicate beam failure or if the UE determines that new candidate beams are not available for both or all of the failed TRPs, the UE may encode or include in the MAC CE the TRP failure information or octets including the TRP failure information and / or AC fields for both or all of the failed TRPs. The new candidate beams for one or more TRPs may then be further indicated by the selected DL RS (SSB or CSI-RS) for the random access procedure initiated for beam failure recovery.

[0102] The MAC CE shown in Figure 5 may be applicable to one or more of the SpCell, SCell, and / or multiple SCells. Information may be coded as described above for each serving cell indicated for failure.

[0103] FIG. 6 illustrates a flow chart according to an exemplary embodiment. The functions illustrated in FIG. 6 may be performed by a device such as a UE or a device included in the UE. Referring to FIG. 6, a beam failure is detected on at least one TRP of a plurality of TRPs (601), and the device is configured to communicate with the plurality of TRPs. One or more beam failure indication data are included in a first MAC CE (602), and the one or more beam failure indication data indicate the beam failure detected on the at least one TRP. The one or more beam failure indication data comprises at least a first bit having a first value and a second value, and the first value of the first bit indicates at least a first TRP of the plurality of TRPSs in which a beam failure is detected. The second value of the first bit may, for example, indicate a second TRP of the plurality of TRPs in which a beam failure is detected. Alternatively, the second value of the first bit may indicate that a beam failure is not detected on at least the first TRP. The first MAC CE comprising the one or more beam failure indication data is transmitted to an access point (603).

[0104] FIG. 7 shows a flowchart according to another exemplary embodiment. The functions shown in FIG. 7 may be performed by an apparatus such as an access point or an apparatus included in an access point. Referring to FIG. 7, a MAC CE indicating a beam failure on at least one TRP is received from a UE (701). The MAC CE comprises at least a first bit having a first value and a second value, and the first value of the bit indicates a beam failure on at least the first TRP. The second value of the first bit may indicate, for example, that the beam failure is on a second TRP of the multiple TRPs. Alternatively, the second value of the first bit may indicate that a beam failure is not detected on the first TRP.

[0105] FIG. 8 shows a flowchart according to another exemplary embodiment. The functions shown in FIG. 8 may be performed by a device such as a UE or a device included in the UE. Referring to FIG. 8, a first set of beam failure indication data indicating at least one TRP where a beam failure is detected is included in a first MAC CE (801). A second set of beam failure indication data indicating at least one cell-level beam failure is included in a second MAC CE (802). For example, a legacy BFR MAC CE (e.g., the BFR MAC CE shown in FIG. 2) may be used as a second BFR MAC CE for a cell where a complete cell-level failure is indicated, and a new BFR MAC CE (e.g., the BFR MAC CE shown in FIG. 4 or FIG. 5) may be used as a first MAC CE for a cell where a TRP-specific failure is indicated. The second MAC CE is transmitted to an access point (803). The first MAC CE is transmitted to an access point (804).

[0106] In one example, the UE may indicate both cell-level BFR MAC CE and TRP-level BFR MAC CE in a single MAC PDU.

[0107] In another example, a cell level BFR MAC CE may be prioritized over a TRP level BFR MAC CE, in other words, a second BFR MAC CE may be transmitted before a first BFR MAC CE.

[0108] In another example, the BFR MAC CE (cell-level or TRP-level) that indicates that the SpCell has failed may be prioritized in the event that the SpCell has failed.

[0109] FIG. 9 illustrates a flowchart according to another exemplary embodiment. The functions illustrated in FIG. 9 may be performed by an apparatus such as an access point or an apparatus included in an access point. Referring to FIG. 9, a second MAC CE is received (901), the second MAC CE comprising a second set of beam failure indication data indicating at least one cell-level beam failure. A first MAC CE is received (902), the first MAC CE comprising a first set of beam failure indication data indicating at least one TRP where a beam failure is detected.

[0110] In some example embodiments, the MAC CE may comprise at least one of the following: 1) A field value / subheader value indicating that the MAC CE is a MAC CE indicating a failure of at least one TRP of at least one serving cell, e.g., an LCID, and / or 2) Legacy BFR MAC CE field / subheader value, e.g., LCID, may be coded in a specific field of the legacy BFR MAC CE if the UE is configured with mTRP beam failure detection and recovery. mTRP failure detection may be determined based on the configuration of multiple sets of q0.

[0111] In another example embodiment, the MAC CE may comprise a set of per-cell fields and at least one field specific to the TRP, which may include the following: 1) A bit indicating whether the fault is for TRP0 or TRP1; 2) An AC field indicating whether a new candidate beam is available, for example above a Reference Signal Received Power (RSRP) threshold; and 3) Candidate RS index.

[0112] The functions and / or blocks described above with reference to Figures 3 and 6-8 are not in absolute chronological order, and some of them may be performed simultaneously or in a different order than the order described. Other functions and / or blocks may also be performed between or within them.

[0113] A technical advantage provided by some exemplary embodiments is that they may enable improved beam failure recovery procedures to cover mTRP operation. Some exemplary embodiments may improve communication efficiency and enable a UE to recover more efficiently from beam failure. Additionally, in some exemplary embodiments, octets may be omitted from the MAC CE when at least one TRP, but not all TRPs, is failing. Additionally, two or more TRPs may be indicated as failing.

[0114] FIG. 10 illustrates an apparatus 1000 that may be an apparatus such as a terminal device or an apparatus included in a terminal device, according to an exemplary embodiment. The terminal device may also be referred to herein as a UE or user equipment. The apparatus 1000 comprises a processor 1010. The processor 1010 interprets computer program instructions and processes data. The processor 1010 may comprise one or more programmable processors. The processor 1010 may comprise programmable hardware with embedded firmware, or alternatively or additionally may comprise one or more application specific integrated circuits (ASICs).

[0115] The processor 1010 is coupled to the memory 1020. The processor is configured to read and write data to and from the memory 1020. The memory 1020 may comprise one or more memory units. The memory units may be volatile or non-volatile. It is noted that in some exemplary embodiments, there may be one or more units of non-volatile memory and one or more units of volatile memory, or one or more units of non-volatile memory, or one or more units of volatile memory. The volatile memory may be, for example, a random access memory (RAM), a dynamic random access memory (DRAM), or a synchronous dynamic random access memory (SDRAM). The non-volatile memory may be, for example, a read only memory (ROM), a programmable read only memory (PROM), an electronically erasable programmable read only memory (EEPROM), a flash memory, an optical storage, or a magnetic storage. In general, the memory may be referred to as a non-transitory computer-readable medium. The memory 1020 stores computer-readable instructions executed by the processor 1010. For example, the non-volatile memory stores computer-readable instructions, and the processor 1010 executes the instructions using the volatile memory for temporary storage of data and / or instructions.

[0116] The computer readable instructions may be pre-stored in memory 1020 or alternatively or additionally may be received by the device via an electromagnetic carrier signal and / or copied from a physical entity such as a computer program product. Execution of the computer readable instructions causes device 1000 to perform one or more of the functions described above.

[0117] In the context of this document, "memory" or "computer-readable medium" or "computer-readable media" may be any non-transitory medium or media or means capable of containing, storing, communicating, propagating, or carrying instructions for use by or in connection with an instruction execution system, apparatus, or device such as a computer.

[0118] The device 1000 may further comprise or be connected to an input unit 1030. The input unit 1030 may comprise one or more interfaces for receiving input. The one or more interfaces may comprise, for example, one or more temperature, motion and / or orientation sensors, one or more cameras, one or more accelerometers, one or more microphones, one or more buttons and / or one or more touch detection units. Furthermore, the input unit 1030 may comprise an interface to which an external device may be connected.

[0119] The device 1000 may also comprise an output unit 1040. The output unit may comprise or be connected to one or more displays capable of rendering visual content, such as a Light Emitting Diode (LED) display, a Liquid Crystal Display (LCD), and / or a Liquid Crystal on Silicon (LCoS) display. The output unit 1040 may further comprise one or more audio outputs. The one or more audio outputs may be, for example, speakers.

[0120] The device 1000 further comprises a connection unit 1050. The connection unit 1050 allows wireless connection to one or more external devices. The connection unit 1050 comprises at least one transmitter and at least one receiver, which may be integrated in the device 1000 or to which the device 1000 may be connected. The at least one transmitter comprises at least one transmitting antenna, and the at least one receiver comprises at least one receiving antenna. The connection unit 1050 may comprise an integrated circuit or a set of integrated circuits that provide the device 1000 with wireless communication capabilities. Alternatively, the wireless connection may be a hardwired application specific integrated circuit (ASIC). The connection unit 1050 may comprise one or more components, such as a power amplifier, a digital front end (DFE), an analog-to-digital converter (ADC), a digital-to-analog converter (DAC), a frequency converter, a (demodulation) modulator, and / or a code / decode circuit, controlled by a corresponding control unit.

[0121] It should be noted that the apparatus 1000 may further comprise various components not shown in Figure 10. The various components may be hardware components and / or software components.

[0122] The apparatus 1100 of FIG. 11 illustrates an exemplary embodiment of an apparatus such as or included in an access point such as a gNB. The apparatus may comprise, for example, a circuit or chipset applicable to an access point to realize some of the exemplary embodiments described. The apparatus 1100 may be an electronic device comprising one or more electronic circuits. The apparatus 1100 may comprise a communication control circuit 1110 such as at least one processor and at least one memory 1120 including computer program code (software) 1122, the at least one memory and the computer program code (software) 1122 being configured to cause the apparatus 1100, with the at least one processor, to perform some of the exemplary embodiments described above.

[0123] The memory 1120 may be implemented using any suitable data storage technology, such as semiconductor-based memory devices, flash memory, magnetic memory devices and systems, optical memory devices and systems, fixed and / or removable memory, etc. The memory may comprise a configuration database for storing configuration data. For example, the configuration database may store a current neighbor cell list and, in some exemplary embodiments, the structure of frames used in detected neighbor cells.

[0124] The apparatus 1100 may further comprise a communication interface 1130 comprising hardware and / or software for realizing a communication connection according to one or more communication protocols. The communication interface 1130 comprises at least one transmitter (TX) and at least one receiver (RX) which may be integrated in the apparatus 1100 or to which the apparatus 1100 may be connected. The communication interface 1130 provides the apparatus with wireless communication capabilities for communicating in a cellular communication system. The communication interface may provide, for example, a radio interface to a terminal device. The apparatus 1100 may further comprise another interface to a core network, such as a network coordinator apparatus, and / or to an access node of the cellular communication system. The apparatus 1100 may further comprise a scheduler 1140 configured to allocate resources.

[0125] As used in this application, the term "circuitry" may refer to one or more or all of the following: (a) Hardware-only circuit implementation (e.g., implementation in analog and / or digital circuits only) (b) A combination of hardware circuitry and software, such as (where applicable) (i) A combination of analog and / or digital hardware circuitry and software / firmware. (ii) Any portion of software (including digital signal processors), hardware processors having software and memory that work together to cause a device, such as a mobile phone, to perform various functions. (c) A hardware circuit and / or processor, such as a microprocessor or portion of a microprocessor, that requires software (e.g., firmware) to operate, but the software may not be present when it is not needed for operation.

[0126] 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 encompasses merely a hardware circuit or processor (or processors), or a portion of a hardware circuit or processor, as well as its (or their) accompanying software and / or firmware implementations. The term circuitry also encompasses, for example, a baseband or processor integrated circuit for a mobile device, or a similar integrated circuit in a server, cellular network device, or other computing or network device, if applicable to a particular claim element.

[0127] The techniques and methods described herein may be implemented by various means. For example, these techniques may be implemented in hardware (one or more devices), firmware (one or more devices), software (one or more modules), or a combination thereof. In the case of a hardware implementation, the apparatus of the exemplary embodiment may be implemented in one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), graphics processing units (GPUs), processors, controllers, microcontrollers, microprocessors, other electronic units designed to perform the functions described herein, or a combination thereof. In the case of firmware or software, the implementation may be performed through modules (e.g., procedures, functions, etc.) of at least one chipset that performs the functions described herein. The software code may be stored in a memory unit and executed by the processor. The memory unit may be implemented within the processor or external to the processor. In the latter case, it may be communicatively coupled to the processor through various means, as known in the art. Additionally, the components of the systems described herein may be rearranged and / or supplemented with additional components to facilitate accomplishment of various aspects, etc., described in connection therewith, and are not limited to the precise configurations illustrated in the given figures, as will be understood by those skilled in the art.

[0128] It is obvious to those skilled in the art that as technology advances, the concept of the present invention can be implemented in various ways. The embodiment is not limited to the above exemplary embodiment, and can be modified within the scope of the claims. Therefore, all words and expressions should be interpreted broadly and are intended to describe the exemplary embodiment, not to limit it.

Claims

1. 1. An apparatus comprising at least one processor and at least one memory containing computer program code, the at least one memory and the computer program code being adapted to execute, using the at least one processor: detecting beam failure on at least one beam failure detection reference signal (BFD-RS) set among a plurality of BFD-RS sets, the device communicating with an access point supporting the plurality of BFD-RS sets; including one or more beam failure indication data in a first medium access control (MAC) control element (CE), the one or more beam failure indication data indicating the beam failure detected on at least one of the BFD-RS sets, the one or more beam failure indication data comprising at least a first bit, a first value of the first bit indicating that the one or more beam failure indication data includes only one candidate beam availability indication bit corresponding to a first BFD-RS set of the plurality of BFD-RS sets, and a second value of the first bit indicating that the one or more beam failure indication data includes multiple candidate beam availability indication bits; and transmitting the first MAC CE comprising one or more of the beam failure indication data to the access point.

2. 2. The apparatus of claim 1 , wherein the second value of the first bit indicates that no beam failure is detected on at least the first BFD-RS set of the plurality of BFD-RS sets.

3. 3. The apparatus of claim 2, wherein the one or more beam failure indication data further comprise at least one of a first set of candidate beam information associated with the first BFD-RS set and a second set of candidate beam information associated with the second BFD-RS set.

4. 4. The apparatus of claim 3, wherein when the first bit is set to the first value, the first set of candidate beam information is included in the first MAC CE before including the second set of candidate beam information in the first MAC CE.

5. The apparatus of claim 3 or 4, characterized in that when the first bit is set to the first value, the one or more beam failure indication data further comprises at least a second bit indicating whether the beam failure is detected on the second BFD-RS set.

6. The apparatus of any one of claims 1 to 5, wherein the one or more beam failure indication data further indicate whether the beam failure is for a BFD-RS set-level beam failure or a cell-level beam failure.

7. The apparatus of claim 6, wherein the BFD-RS set-level beam failure or the cell-level beam failure is indicated by a bitmap in one or more of the beam failure indication data, the length of the bitmap being determined based at least in part on the number of serving cells in which the beam failure is detected.

8. The apparatus of any one of claims 1 to 7, further comprising the step of transmitting a second medium access control (MAC) control element (CE) to the access point indicating a cell-level beam failure.

9. 1. An apparatus comprising at least one processor and at least one memory containing computer program code, the at least one memory and the computer program code being adapted to execute, using the at least one processor: having the apparatus perform a step of receiving, from a terminal device, a medium access control (MAC) control element (CE) comprising one or more beam failure indication data indicating a beam failure on at least one beam failure detection reference signal (BFD-RS); The apparatus, characterized in that one or more of the beam failure indication data comprises at least a first bit, a first value of the first bit indicating that the one or more beam failure indication data includes only one candidate beam availability indication bit corresponding to a first BFD-RS set among the plurality of the BFD-RS sets, and a second value of the first bit indicating that the one or more beam failure indication data includes multiple candidate beam availability indication bits.

10. Detecting beam failure on at least one beam failure detection reference signal (BFD-RS) set of a plurality of BFD-RS sets by a terminal device, the terminal device communicating with an access point supporting a plurality of the BFD-RS sets; including, by the terminal device, one or more beam failure indication data in a first medium access control (MAC) control element (CE), the one or more beam failure indication data indicating the beam failure detected on at least one of the BFD-RS sets, the one or more beam failure indication data comprising at least a first bit, a first value of the first bit indicating that the one or more beam failure indication data includes only one candidate beam availability indication bit corresponding to a first BFD-RS set of the plurality of the BFD-RS sets, and a second value of the first bit indicating that the one or more beam failure indication data includes multiple candidate beam availability indication bits; and transmitting, by the terminal device, the first MAC CE comprising one or more of the beam failure indication data to the access point.

11. receiving, by the access point, from a terminal device, a medium access control (MAC) control element (CE) comprising one or more beam failure indication data indicative of a beam failure on at least one beam failure detection reference signal (BFD-RS); The method, characterized in that one or more of the beam failure indication data comprises at least a first bit, a first value of the first bit indicating that the one or more beam failure indication data includes only one candidate beam availability indication bit corresponding to a first BFD-RS set among the plurality of the BFD-RS sets, and a second value of the first bit indicating that the one or more beam failure indication data includes multiple candidate beam availability indication bits.

12. detecting beam failure on at least one beam failure detection reference signal (BFD-RS) set among a plurality of BFD-RS sets, the device communicating with an access point supporting the plurality of BFD-RS sets; including one or more beam failure indication data in a first medium access control (MAC) control element (CE), the one or more beam failure indication data indicating the beam failure detected on at least one of the BFD-RS sets, the one or more beam failure indication data comprising at least a first bit, a first value of the first bit indicating that the one or more beam failure indication data includes only one candidate beam availability indication bit corresponding to a first BFD-RS set of the plurality of BFD-RS sets, and a second value of the first bit indicating that the one or more beam failure indication data includes multiple candidate beam availability indication bits; and transmitting the first MAC CE comprising the one or more beam failure indication data to an access point.

13. receiving, from a terminal device, a medium access control (MAC) control element (CE) comprising one or more beam failure indication data indicative of a beam failure on at least one beam failure detection reference signal (BFD-RS); A computer program product comprising: one or more of the beam failure indication data comprising at least a first bit; a first value of the first bit indicating that the one or more beam failure indication data includes only one candidate beam availability indication bit corresponding to a first BFD-RS set among the plurality of the BFD-RS sets; and a second value of the first bit indicating that the one or more beam failure indication data includes multiple candidate beam availability indication bits.

14. A system comprising at least a terminal device and an access point, The terminal device is Detecting beam failure on at least one beam failure detection reference signal (BFD-RS) set among a plurality of BFD-RS sets, the terminal device communicating with the access point supporting a plurality of the BFD-RS sets; Include one or more beam failure indication data in a first medium access control (MAC) control element (CE), the one or more beam failure indication data indicating the beam failure detected on at least one of the BFD-RS sets, the one or more beam failure indication data comprising at least a bit, a first value of the bit indicating that the one or more beam failure indication data includes only one candidate beam availability indication bit corresponding to a first BFD-RS set of the plurality of the BFD-RS sets, and a second value of the bit indicating that the one or more beam failure indication data includes multiple candidate beam availability indication bits; transmitting the first MAC CE comprising one or more of the beam failure indication data to the access point; The access point is receiving the first MAC CE comprising one or more beam failure indication data from the terminal device.

15. 10. The apparatus of claim 1, wherein the plurality of BFD-RS sets are supported by one or more access points.

16. 10. The apparatus of claim 9, wherein the plurality of BFD-RS sets are supported by one or more access points, and the apparatus is one of the one or more access points.

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