• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
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    • 专利摘要:
    Aspects of the present disclosure refer to techniques that can intensify radio link failure (RLF) procedures. In some cases, a UE can perform radio link monitoring (RLM) based on the reference signals (RS) transmitted using a first set of beams, perform beam failure recovery (BFR) monitoring with based on transmissions using a second set of beams, and adjust one or more radio link failure (RLF) parameters based on both RLM and BFR monitoring.
    公开号:BR112020001259A2
    申请号:R112020001259-9
    申请日:2018-07-20
    公开日:2020-07-21
    发明作者:Kaushik Chakraborty；Tao Luo；Wooseok Nam；Sumeeth Nagaraja；Sony Akkarakaran；Makesh Pravin John Wilson；Xiao Feng Wang；Shengbo Chen；Juan Montojo
    申请人:Qualcomm Incorporated；
    IPC主号:
    专利说明:

    [0001] [0001] This application claims the benefit of Provisional Patent Application Serial No. US 62 / 536,459, filed on July 24, 2017, and Patent Application No. US 16 / 040,178, filed on July 19, 2018, both of which are incorporated into this document as a reference in their entirety. Introduction
    [0002] [0002] Aspects of the present disclosure relate to wireless communications, and more particularly, to radio link failure (RLF) monitoring.
    [0003] [0003] Wireless communication systems are widely installed to provide various telecommunication services such as telephony, video, data, messages and broadcasts. Typical wireless communication systems can employ multiple access technologies capable of supporting communication with multiple users by sharing available system resources (for example, bandwidth, transmission power). Examples of such multiple access technologies include multiple access systems by division (CDMA), multiple access systems by time division (TDMA), multiple access systems by frequency division (FDMA), multiple access systems by division by orthogonal frequency (OFDMA), multiple access systems by single carrier frequency division (SC-FDMA), and multiple access systems by time division synchronous code division (TD-SCDMA).
    [0004] [0004] In some examples, a wireless multiple access communication system may include numerous base stations, each simultaneously supporting communication to multiple communication devices, otherwise known as user equipment (UEs). In a Long Term Evolution (LTE) or Advanced LTE (LTE-A) network, a set of one or more base stations can define an eNodeB (eNB). In other examples (for example, on a next generation or 5G network), a wireless multiple access communication system can include numerous distributed units (DUs) (for example, edge units (EUs), edge nodes (ENs) ), radio heads (RHs), intelligent radio heads (SRHs), transmit-receive points (TRPs), etc.) in communication with numerous central units (CUs) (for example, central nodes (CNs), controllers of access node (ANCs, etc.), where a set of one or more distributed units, in communication with a central unit, can define an access node (for example, a new radio base station (NR BS) , a new radio node-B (NR NB), a network node, 5G NB, gNB, gNodeB, etc.). A base station or DU can communicate with a set of UEs on downlink channels (for example, for transmissions from a base station or for a UE) and uplink channels (for example, for transmissions from UE to a base station or distributed unit).
    [0005] [0005] These multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that allows different wireless devices to communicate at a municipal, national, regional and even global level. An example of an emerging telecommunication standard is new radio (NR), for example, 5G radio access. NR is a set of enhancements to the mobile LTE standard promulgated by the Third Generation Partnership Project (3GPP). It is designed to better support mobile broadband Internet access by improving spectral efficiency, reducing costs, improving services, making use of new spectrum and integrating better with other open standards that use OFDMA with a cyclic prefix (CP) on the downlink (DL) and on the uplink (UL) as well as support beam formation, multiple input and multiple output antenna technology (MIMO) and carrier aggregation.
    [0006] [0006] However, as the demand for mobile broadband access continues to increase, there is a need for further improvements in NR technology. Preferably, these enhancements should be applicable to other multi-access technologies and the telecommunication standards that employ these technologies. SUMMARY
    [0007] [0007] As described in this document, certain wireless systems may employ directional beams for transmission and reception.
    [0008] [0008] Certain aspects of the present disclosure provide a method for wireless communication that can be performed, for example, by a UE. The method usually includes performing radio link monitoring (RLM) based on reference signals (RS)
    [0009] [0009] Aspects generally include methods, apparatus, systems, computer-readable media and processing systems, as substantially described in this document with reference to and as illustrated by the accompanying drawings.
    [0010] [0010] Other aspects, resources and modalities of the present invention will become evident to those skilled in the art, by reviewing the description below of specific exemplary modalities of the present invention in conjunction with the attached Figures. Although the features of the present invention can be discussed in relation to certain embodiments and figures below, all of the embodiments of the present invention can include one or more of the advantageous features discussed in this document. In other words, although one or more modalities can be discussed as having certain advantageous features, one or more of such features can also be used in accordance with the various embodiments of the invention discussed herein. Similarly, although the exemplary modalities can be discussed below as device, system or method modalities, it should be understood that such exemplary modalities can be deployed in various devices, systems and methods. BRIEF DESCRIPTION OF THE DRAWINGS
    [0011] [0011] Figure 1 is a block diagram that conceptually illustrates an exemplary telecommunications system, according to certain aspects of the present disclosure.
    [0012] [0012] Figure 2 is a block diagram that illustrates an exemplary logical architecture of a distributed RAN, according to certain aspects of the present disclosure.
    [0013] [0013] Figure 3 is a diagram that illustrates an exemplary physical architecture of a distributed RAN, according to certain aspects of the present disclosure.
    [0014] [0014] Figure 4 is a block diagram that conceptually illustrates a project of an exemplary BS and UE, according to certain aspects of the present disclosure.
    [0015] [0015] Figure 5 is a diagram showing examples for deploying a stack of communication protocols, according to certain aspects of the present disclosure.
    [0016] [0016] Figure 6A illustrates an example of a centric subframe of DL, according to certain aspects of the present disclosure.
    [0017] [0017] Figure 6B illustrates an example of a centric subframe of UL, according to certain aspects of the present disclosure.
    [0018] [0018] Figure 7 illustrates an example of a frame format for a new radio (NR) system, according to certain aspects of the present disclosure.
    [0019] [0019] Figure 8 illustrates an example of a PI, P2 and P3 procedure, according to certain aspects of the present disclosure.
    [0020] [0020] Figure 9 illustrates exemplary considerations that affect a radio link failure (RLF) procedure.
    [0021] [0021] Figure 10 illustrates an example RLF timer and triggers for starting the RLF timer.
    [0022] [0022] Figure 11 illustrates an exemplary scenario in which a UE is reachable through certain bundles and unreachable by others.
    [0023] [0023] Figure 12 illustrates an exemplary RLF timer and triggers for terminating the RLF timer.
    [0024] [0024] Figure 13 illustrates an example scenario in which a UE is unreachable by different types of beams.
    [0025] [0025] Figure 14 illustrates exemplary operations that can be performed by user equipment (UE), according to aspects of the present disclosure.
    [0026] [0026] Figure 15 illustrates an example of how an RLF timer can be started early, according to aspects of the present disclosure.
    [0027] [0027] Figure 16 illustrates an example of how an RLF timer can be terminated early, according to aspects of the present disclosure.
    [0028] [0028] Figure 17 illustrates another example of how an RLF timer can be terminated early, according to aspects of the present disclosure.
    [0029] [0029] Figure 18 illustrates how delimitation detection limits in synchronization (IS) can be lowered, according to aspects of the present disclosure.
    [0030] [0030] Figure 19 illustrates how different RLF limit values can be used under different conditions, according to aspects of the present disclosure.
    [0031] [0031] To facilitate understanding, identical numerical references were used, when possible, to designate identical elements that are common to the Figures. It is contemplated that the elements revealed in one aspect can be used beneficially in other aspects without specific citation. DETAILED DESCRIPTION
    [0032] [0032] Aspects of the present disclosure provide apparatus, methods, processing systems and computer-readable media for new radio (NR) (new radio access technology or 5G technology).
    [0033] [0033] NR can support various wireless communication services, such as broadband width targeting Enhanced mobile broadband (eMBB) (eg 80 MHz beyond), high carrier frequency targeting millimeter wave (mmW) (eg , 60 GHz), MTC techniques not compatible with previous versions that target massive MTC (mMTC), and / or ultra-reliable low-latency communications that target mission critical (URLLC). These services may include latency and reliability requirements. These services may also have different transmission time intervals (TTI) to satisfy the respective quality of service (QoS) requirements. In addition, these services can coexist in the same subframe.
    [0034] [0034] Certain multi-beam wireless systems, such as mmW systems, take gigabit speeds for cellular networks due to the availability of large amounts of bandwidth. However, the unique challenge of heavy path loss faced by millimeter wave systems needs new techniques such as hybrid beam formation (analog and digital), which are not present in 3G and 4G systems. The hybrid beam formation can intensify the signal-to-noise (SNR) link / ratio calculation that can be exploited during RACH.
    [0035] [0035] In such systems, node B (NB) and user equipment (UE) can communicate with the use of transmissions formed in beam. In order to deform the beam to function properly, the NB may need to monitor beams using beam measurements performed (for example, based on reference signals transmitted by the NB) and feedback generated at the UE. However, since the direction of a reference signal is unknown to the UE, the UE may need to evaluate several beams to obtain the best Rx beam for a given NB Tx beam. Consequently, if the UE has to “sweep” across all of its Rx beams to perform measurements (for example, to determine the best Rx beam for a given NB Tx beam), the UE may incur significant delay in measurement and impact on battery life. What's more, having to scan through all the Rx beams is a highly ineffective feature. Therefore, aspects of the present disclosure provide techniques to assist an UE when taking measurements of server and neighboring cells when using the Rx beam formation.
    [0036] [0036] The following description provides examples, it is not limiting the scope, applicability or examples set out in the claims. Changes can be made to the function and arrangement of the elements discussed without departing from the scope of the disclosure. The various examples can omit, replace or add various procedures or components as appropriate. For example, the methods described can be performed in a different order than described, and several steps can be added, omitted or combined. Also, the features described in relation to some examples can be combined into some other examples. For example, an apparatus can be implanted or a method can be practiced using any number of aspects set out in this document. In addition, the scope of the disclosure is intended to cover such apparatus or method that is practiced using another structure, functionality or structure and functionality in addition to or in addition to the various aspects of the disclosure set out in this document. It should be understood that any aspect of the disclosure disclosed in this document may be incorporated by one or more elements of a claim. The word "exemplary" is used in this document to mean "to serve as an example, occurrence or illustration". Any aspect described in this document as “exemplary” should not necessarily be interpreted as preferential or advantageous over other aspects.
    [0037] [0037] The techniques described in this document can be used for various wireless communications networks such as LTE, CDMA, TDMA, FDMA, OFDMA, SC-FDMA and other networks.
    [0038] [0038] Figure 1 illustrates an exemplary wireless network 100 in which aspects of the present disclosure can be realized. According to an example, the wireless network can be an NR or 5G network that can support mmW communication. MmW communication depends on the beam formation to satisfy the link margin. MmW communication can use directional beam formation, so signal transmission is directional. Consequently, a transmitter can focus the transmission energy in a certain narrow direction (for example, beams can have a narrow angle), as shown in Figure 8. A receiving entity can use the receiver beam formation to receive the transmitted signal. .
    [0039] [0039] In order to use resources more efficiently and conserve power when communicating using beam formation, UEs 120 can be configured to perform the 900 operations and methods described in this document for UE beam formation . The BS 110 can comprise a transmission receiving point (TRP), Node B (NB), 5G NB, access point (AP), new radio (NR) BS, BS Master, primary BS, etc.). The NR 100 network can include the central unit.
    [0040] [0040] As shown in Figure 1, wireless network 100 can include numerous BSs 110 and other network entities. According to an example, network entities that include BS and UEs can communicate at high frequencies (for example,> 6 GHz) using beams.
    [0041] [0041] A BS can be a station that communicates with UEs. Each BS 110 can provide communication coverage for a specific geographic area. In 3GPP, the term “cell” can refer to a coverage area of a Node B and / or a subsystem of Node B that serves that coverage area, depending on the context in which the term is used. In NR systems, the term “cell” and gNB, Node B, 5G NB, AP, NR BS, NR BS or TRP can be interchangeable. In some instances, a cell may not necessarily be stationary, and the cell's geographic area may move according to the location of a mobile base station. In some examples, base stations can be interconnected with each other and / or with one or more other base stations or network nodes (not shown) on wireless network 100 through various types of backhaul interfaces as a direct physical connection , a virtual or similar network that uses any suitable transport network.
    [0042] [0042] In general, any number of wireless networks can be deployed in a given geographic area. Each wireless network can support a specific radio access technology (RAT) and can operate on one or more frequencies. A RAT can also be referred to as a radio technology, an air interface, etc. A frequency can also be referred to as a carrier, a frequency channel, etc. Each frequency can support a single RAT in a given geographic area in order to avoid interference between wireless networks from different RATs. In some cases, NR or RAT 5G networks can be deployed.
    [0043] [0043] A BS can provide communication coverage for a macrocell, a picocell, a femtocell and / or other types of cells. A macrocell can cover a relatively large geographical area (for example, several kilometers in radius) and can allow unrestricted access by UEs with a service subscription. A picocell can cover a relatively small geographical area and can allow unrestricted access by UEs with a service subscription. A femtocell can cover a relatively small geographic area (for example, a residence) and can allow restricted access by UEs that are associated with the femtocell (for example, UEs in a Closed Subscriber Group (CSG), UEs for users in the residence, etc.). A BS for a macrocell can be referred to as a BS macro. A BS for a picocell can be referred to as a BS peak. A BS for a femtocell can be referred to as a BS femto or a domestic BS. In the example shown in Figure 1, BSs 110a, 110b and 110c can be macro BSs for macrocells 102a, 102b and 102c, respectively. The BS 110x can be a BS peak for a 102x picocell. BSs HOy and HOz can be BS femto for femtocells 102y and 102z, respectively. A BS can support one or multiple (for example, three) cells.
    [0044] [0044] Wireless network 100 may also include relay stations. A relay station is a station that receives a transmission of data and / or other information from a uplink station (for example, a BS or a UE) and sends a transmission of the data and / or other information to a descendant station (for example , a UE or a BS). A relay station can also be a UE that relays transmissions to other UEs. In the example shown in Figure 1, an 11 Or relay station can communicate with BS 110a and UE 120r to facilitate communication between BS 110a and UE 120r. A relay station can also be referred to as a relay BS, a relay, etc.
    [0045] [0045] Wireless network 100 can be a heterogeneous network that includes BSs of different types, for example, macro BSs, pico BSs, femto BSs, retransmissions, etc. These different types of BSs can have different transmit power levels, different coverage areas, and different impact on interference on the wireless network 100. For example, the BS macro can have a high transmit power level (for example, 20 watts) while the BS peak, BS femto and relays may have a lower transmission power level (for example, 1 watt).
    [0046] [0046] Wireless network 100 can support synchronous or asynchronous operation. For synchronous operation, BSs can have similar frame timing, and transmissions from different BSs can be approximately time aligned. For asynchronous operation, BSs may have different frame timing, and transmissions from different BSs may not be time aligned. The techniques described in this document can be used for both synchronous and asynchronous operations.
    [0047] [0047] A network controller 130 can couple with a set of BSs and provide coordination and control for those BSs. The network controller 130 can communicate with the BSs 110 through a backhaul. The BSs
    [0048] [0048] UEs 120 (e.g. 120x, 120y, etc.) can be dispersed over wireless network 100, and each UE can be stationary or mobile. A UE can also be referred to as a mobile station, a terminal, an access terminal, a subscriber unit, a station, a Customer Premises Equipment (CPE), a cell phone, a smart phone, a personal digital assistant ( PDA), a wireless modem, a wireless communication device, a portable device, a laptop computer, a cordless phone, a local wireless loop station (WLL), a tablet computer, a camera, a gaming device, a netbook computer, a smartbook, an ultrabook, a medical device or medical equipment, a biometric sensor / device, a device that can be worn close to the body like a smart watch, smart clothes, smart glasses, a smart bracelet, smart jewelry (for example, a smart ring, a smart bracelet, etc.), an entertainment device (for example, a music device, a video device, a satellite radio, etc.), a ç vehicle component or sensor, an intelligent meter / sensor, industrially manufactured equipment, a global positioning system device or any other suitable device that is configured to communicate wirelessly or wired. Some UEs can be considered machine-type communication devices (MTC) or evolved or evolved MTC devices (eMTC).
    [0049] [0049] In Figure 1, a continuous line with double arrows indicates desired transmissions between a UE and a serving BS, which is a BS designated to serve the UE on the downlink and / or on the uplink. A dashed line with double arrows indicates transmissions of interference between a UE and a BS.
    [0050] [0050] Certain wireless networks (for example, LTE) use orthogonal frequency division multiplexing (OFDM) on the downlink and single carrier frequency division multiplexing (SC-FDM) on the uplink. OFDM and SC-FDM divide the system's bandwidth into multiple (K) orthogonal subcarriers, which are also commonly referred to as tones, intervals, etc. Each subcarrier can be modulated with data. In general, the modulation symbols are sent in the frequency domain with OFDM and in the time domain with SC-FDMA. The spacing between adjacent subcarriers can be fixed, and the total number of subcarriers (K) can be dependent on the system's bandwidth. For example, the spacing of the subcarriers can be 15 kHz and the minimum resource allocation (called a “resource block”) can be 12 subcarriers (or 180 kHz). Consequently, the size of the nominal FFT can be equal to 128, 256, 512,
    [0051] [0051] While the aspects of the examples described in this document may be associated with LTE technologies, aspects of the present disclosure may be applicable with other wireless communication systems, such as NR.
    [0052] [0052] NR can use OFDM with a CP on the uplink and downlink and include support for half duplex operation with the use of TDD. A single component carrier bandwidth of 100 MHz can be supported. NR resource blocks can span 12 subcarriers with a 75 kHz subcarrier bandwidth over a duration of 0.1 ms. In one aspect, each radio frame can consist of 50 subframes with a duration of 10 ms. Consequently, each subframe can be 0.2 ms long. In another aspect, each radio frame can consist of 10 subframes with a duration of 10 ms, where each subframe can have a duration of 1 ms. Each subframe can indicate a link direction (ie DL or UL) for data transmission and the link direction for each subframe can be dynamically changed. Each subframe can include DL / UL data as well as DL / UL control data. The subframes of UL and DL to NR can be as described in more detail below in relation to Figures 6 and 7. The beam formation can be supported and the beam direction can be dynamically configured. Pre-encrypted MIMO transmissions can also be supported. The MIMO configurations on the DL can support up to 8 transmission antennas with multi-layered DL transmissions up to 8 streams and up to 2 streams per UE. Multilayer transmissions with up to 2 streams per EU can be supported. Multiple cell aggregation can be supported with up to 8 server cells. Alternatively, NR can support a different air interface, in addition to one based on OFDM. NR networks can include entities such as CUs and / or DUs.
    [0053] [0053] In some examples, access to the air interface can be programmed, in which a programming entity (for example, a base station) allocates resources for communication among some or all devices and equipment within its area service or cell. In the present disclosure, as discussed further below, the scheduling entity may be responsible for scheduling, assignment, reconfiguration and release resources for one or more subordinate entities. That is, for scheduled communication, subordinate entities use resources allocated by the programming entity. Base stations are not the only entities that can function as a programming entity. That is, in some examples, a UE may function as a programming entity, programming resources for one or more subordinate entities (for example, one or more other UEs). In this example, the UE is functioning as a programming entity, and other UEs use resources programmed by the UE for wireless communication. A UE can function as a programming entity in a peer-to-peer (P2P) network and / or a mesh network. In an example of a mesh network, UEs can optionally communicate directly with each other in addition to communicating with the programming entity.
    [0054] [0054] Thus, in a wireless communication network with programmed access to time-frequency resources and that has a cellular configuration, a P2P configuration and a mesh configuration, a programming entity and one or more subordinate entities can communicate using the programmed resources.
    [0055] [0055] As noted above, a RAN can include a CU and DUs. An NR BS (for example, gNB, Node B 5G, Node B, transmit receive point (TRP), access point (AP)) can correspond to one or multiple BSs. NR cells can be configured as access cells (ACells) or data-only cells (DCells). For example, the RAN (for example, a central unit or distributed unit) can configure the cells. DCells can be cells used for carrier aggregation or dual connectivity, but are not used for initial access, repeated cell selection / selection, or automatic switching. In some cases, DCells may not transmit synchronization signals - in some cases, DCells may transmit SS. NR BSs can transmit downlink signals to UEs that indicate the cell type. Based on the cell type indication, the UE can communicate with the BS of NR. For example, the UE can determine BSs of NR to consider cell selection, access, automatic change and / or measurement based on the indicated cell type.
    [0056] [0056] Figure 2 illustrates an exemplary logical architecture of a distributed radio access network (RAN) 200, which can be deployed in the wireless communication system illustrated in Figure 1. A 5G 206 access node can include a controller access node (ANC) 202. The ANC can be a central unit (CU) of the distributed RAN 200. The backhaul interface to the next generation main network (NG-CN) 204 can end at the ANC. The backhaul interface for neighboring next generation access nodes (NG-ANs) can end at ANC. The ANC may include one or more 208 TRPs (which may also be referred to as BSs, NR BSs, Nodes B, 5G NBs, APs or some other term). As described above, a TRP can be used interchangeably with "cell".
    [0057] [0057] TRPs 208 can be a DU. TRPs can be connected to an ANC (ANC 202) or more than one ANC (not shown). For example, for RAN sharing, radio as a service (RaaS) and service-specific AND deployments, TRP can be connected to more than one ANC. A TRP can include one or more antenna ports. TRPs can be configured to serve traffic to a UE individually (for example, dynamic selection) or together (for example, joint transmission).
    [0058] [0058] Local architecture 200 can be used to illustrate the definition of fronthaul. The architecture can be defined to support fronthaul solutions through different types of deployment. For example, the architecture can be based on transmission network capabilities (for example, bandwidth, latency and / or jitter).
    [0059] [0059] The architecture can share characteristics and / or components with LTE. According to the aspects, the next generation AN (NG-AN) 210 can support dual connectivity with NR. NG-AN can share a common fronthaul for LTE and NR.
    [0060] [0060] The architecture can enable cooperation between and between TRPs 208. For example, cooperation can be predefined within a TRP and / or through TRPs through ANC 202. According to the aspects, no inter-TRP interface may be necessary / present.
    [0061] [0061] According to the aspects, a dynamic configuration of logical division functions can be present in architecture 200. As will be described in more detail with reference to Figure 5, the Radio Resource Control (RRC) layer, layer of Packet Data Convergence Protocol (PDCP), Radio Link Control layer (RLC), Media Access Control layer (MAC) and Physical layers (PHY) can be placed in an adapted way in DU or CU ( for example, TRP or ANC, respectively). According to certain aspects, a BS may include a central unit (CU) (for example, ANC 202) and / or one or more distributed units (for example, one or more TRPs 208).
    [0062] [0062] Figure 3 illustrates an exemplary physical architecture of a distributed RAN 300, according to aspects of the present disclosure. A centralized main network unit (C-CU) 302 can host main network functions. C-CU can be centrally implanted. The functionality of the C-CU can be downloaded (for example, for advanced wireless services (AWS)), to handle peak capacity.
    [0063] [0063] A centralized RAN unit (C-RU) 304 can host one or more ANC functions. Optionally, C-RU can host core network functions locally. The C-RU can have a distributed deployment. The C-RU may be closer to the edge of the network.
    [0064] [0064] A DU 306 can host one or more TRPs (edge node (EN), edge unit (EU), radio head (RH), main radio head (SRH), or the like). DU can be located on the edges of the network with radio frequency (RF) functionality.
    [0065] [0065] Figure 4 illustrates exemplary components of BS 110 and UE 120 illustrated in Figure 1, which can be used to implement aspects of the present disclosure. The BS can include a TRP or gNB.
    [0066] [0066] According to an example, the antennas 452, DEMOD / MOD 454, processors 466, 458, 464 and / or controller / processor 480 of the UE 120 can be used to perform the operations described in this document and illustrated with reference to Figures 9 and 11 to 12. According to an example, antennas 434, DEMOD / MOD 432, processors 430, 420, 438 and / or controller / processor 440 of BS 110 can be used to perform the operations described in this document and illustrated with reference to Figures 10 to 12.
    [0067] [0067] As an example, one or more of the antennas 452, DEMOD / MOD 454, processors 466, 458, 464 and / or controller / processor 480 of the UE 120 can be configured to perform the operations described in this document for marking based on EU beam. Similarly, one or more of the 434, DEMOD / MOD 432, processors 430, 420, 438 and / or controller / processor 440 of BS 110 can be configured to perform the operations described in this document.
    [0068] [0068] For the restricted association scenario, base station 110 can be macro BS 110c in Figure 1, and UE 120 can be UE 120y. Base station 110 can also be a base station of some other type. Base station 110 can be equipped with antennas 434a to 434t, and UE 120 can be equipped with antennas 452a to 452r.
    [0069] [0069] At base station 110, a transmission processor 420 can receive data from a data source 412 and control information from a controller / processor
    [0070] [0070] At UE 120, antennas 452a to 452r can receive downlink signals from base station 110 and can provide received signals to demodulators (DEMODs) 454a to 454r, respectively. Each 454 modulator can condition (for example, filter, enlarge, downward and digitize) a respective received signal to obtain input samples. Each 454 modulator can further process the input samples (for example, for OFDM, etc.) to obtain received symbols. A MIMO 456 detector can obtain symbols received from all demodulators 454a through 454r, perform MIMO detection on received symbols, if applicable, and provide detected symbols. A receiving processor 458 can process (e.g., demodulate, deinterleave and decode) the detected symbols, providing decoded data to the UE 120 for a data deposit 460, and providing decoded control information to a controller / processor 480.
    [0071] [0071] On the uplink, at UE 120, a transmission processor 464 can receive and process data (for example, for the Physical Uplink Shared Channel (PUSCH)) from a 462 data source and control information ( for example, for the Physical Uplink Shared Channel (PUCCH) from controller / processor 480. The 464 transmission processor can also generate reference symbols for a reference signal. The 464 transmission processor symbols can be pre- encrypted by a MIMO TX 466 processor, if applicable, further processed by demodulators 454a to 454r (for example, for SC-FDM, etc.), and transmitted to base station 110. In BS 110, uplink signals UE 120 can be received by antennas 434, processed by modulators 432, detected by a MIMO 436 detector, if applicable, and further processed by a receiving processor 438 to obtain decoded data and control information sent by UE 120. The receiving processor 438 can provide the decoded data to a data warehouse 439 and the decoded control information to the controller / processor 440.
    [0072] [0072] The controllers / processors 440 and 480 can direct the operation on base station 110 and UE 120, respectively. A programmer 444 can program UEs for data transmission on the downlink and / or uplink. The UE 480 processor and / or other processors and modulated in the UE 120 can perform or direct, for example, the execution of the functional blocks illustrated in Figures 9 and 10 and / or other processes for the techniques described in this document and those illustrated in the attached drawings. The 440 processor and / or other processors and modules in BS 110 can perform or direct processes to the techniques described in this document and those illustrated in the accompanying drawings. Memories 442 and 482 can store data and program codes for BS 110 and UE 120, respectively.
    [0073] [0073] Figure 5 illustrates a diagram 500 that shows examples for deploying a stack of communications protocols, according to the aspects of the present disclosure. The illustrated communications protocol stacks can be deployed by devices that operate on a 5G system. Diagram 500 illustrates a communications protocol stack that includes a Radio Resource Control (RRC) layer 510, a Packet Data Convergence Protocol (PDCP) layer 515, a Radio Link Control (RLC) layer ) 520, a Medium Access Control (MAC) layer 525 and a Physical (PHY) layer 530. In several examples, layers of a protocol stack can be deployed as separate software modules, portions of a processor or ASIC , portions of devices not placed connected by a communications link or various combinations thereof. Placed and unplaced deployments can be used, for example, in a protocol stack for a network access device (for example, ANs, Cus and / or DUs) or a UE.
    [0074] [0074] A first option 505-a shows a protocol stack split deployment, in which the protocol stack deployment is split between a centralized network access device (for example, an ANC 202 in Figure 2) and distributed network access device (for example, DU 208 in Figure 2). In the first option 505-a, a layer of RRC 510 and a layer of PDCP 515 can be implanted by the central unit, and a layer of RLC 520, a layer MAC 525 and a layer PHY 530 can be implanted by the DU. In several examples, CU and DU can be placed or not placed. The first option 505-a may be useful in a macrocell, microcell or peak cell implantation.
    [0075] [0075] A second option 505-b shows a unified deployment of a protocol stack, where the protocol stack is deployed on a single network access device (for example, access node (AN), base station of new radio (NR BS), a new radio Node-B (NR NB), a network node (NN), or the like). In the second option, the RRC layer 510, the PDCP layer 515, the layer of RLC 520, the layer MAC 525 and the layer PHY 530 can each be implanted by the AN. The second option 505-b can be useful in a femtocell implantation.
    [0076] [0076] Regardless of whether a network access device can deploy part or all of a protocol stack, a UE can deploy an entire protocol stack (for example, the RRC 510 layer, the PDCP 515 layer, the RLC 520, MAC 525 layer and layer
    [0077] [0077] Figure 6A is a 600A diagram showing an example of a DL centric subframe. The centric DL subframe may include a 602A control portion. The control portion 602A can exist in the starting or starting portion of the DL centric subframe. The control portion 602A can include various programming information and / or control information that correspond to various portions of the DL centric subframe. In some configurations, the control portion 602A can be a physical DL control channel (PDCCH), as shown in Figure 6A. The centric DL subframe can also include a data portion of DL 604A. The DL 604A data portion can sometimes be referred to as the payload of the DL centric subframe. The DL 604A data portion may include the communication resources used to communicate DL data from the programming entity (for example, UE or BS) to the subordinate entity (for example, UE). In some configurations, the DL 604A data portion may be a physical DL shared channel (PDSCH).
    [0078] [0078] The centric DL subframe can also include a portion of common UL 606A. The common UL portion 606A can sometimes be referred to as a burst of UL, a burst of common UL and / or various other suitable terms. The common UL portion 606A may include feedback information that corresponds to several other portions of the DL centric subframe. For example, the common UL portion 606A may include feedback information that corresponds to the control portion
    [0079] [0079] Figure 6B is a 600B diagram showing an example of a centric UL subframe. The UL centric subframe can include a 602B control portion. The control portion 602B can exist in the starting or starting portion of the UL centric subframe. The control portion 602B in Figure 6B may be similar to the control portion 602A described above with reference to
    [0080] [0080] As shown in Figure 6B, the end of the control portion 602B can be separated in time from the beginning of the UL 604B data portion. This time separation can sometimes be referred to as a gap, protection period, protection interval and / or several other suitable terms. This separation provides time for switching from DL communication (for example, receiving operation by the programming entity) to UL communication (for example, transmission by the programming entity). The centric UL subframe can also include a portion of common UL 606B. The common UL portion 606B in Figure 6B may be similar to the common UL portion 606A described above with reference to Figure 6A. The common UL portion 606B may additionally or alternatively include information pertaining to the channel quality indicator (CQI), audible reference signals (SRSs) and various other suitable types of information. A person of ordinary skill in the art will understand that the aforementioned is merely an example of a centric subframe of UL and alternative structures that have similar characteristics may exist without deviating, necessarily, from the aspects described in this document.
    [0081] [0081] Figure 7 is a diagram showing an example of a frame format 700 for NR. The transmission timeline for each of the downlink and uplink links can be divided into radio frame units. Each radio frame can have a predetermined duration (for example, 10 ms) and can be divided into 10 subframes, each 1 ms, with indexes from 0 to 9. Each subframe can include a variable number of partitions depending on the spacing the subcarrier. Each partition can include a variable number of symbol periods (for example, 7 or 14 symbols) depending on the subcarrier spacing. Symbol periods in each partition can be assigned indexes. A minipartition, which can be referred to as a subpartition structure, refers to a transmission time interval that has a duration less than a partition (for example, 2, 3 or 4 symbols).
    [0082] [0082] Each symbol in a partition can indicate a link direction (for example, DL, UL or flexible) for data transmission and the link direction for each subframe can be dynamically changed. Linking directions can be based on the partition format. Each partition can include DL / UL data as well as DL / UL control information.
    [0083] [0083] In NR, a block of synchronization signal (SS) is transmitted. The SS block includes a PSS, an SSS and a two-symbol PBCH. The SS block can be transmitted in a fixed partition location, as the symbols 0-3 as shown in Figure 6. The PSS and SSS can be used by UEs for cell search and acquisition. PSS can provide half frame timing,
    [0084] [0084] An UE can operate in various radio resource configurations, including a configuration associated with broadcast pilots using a dedicated resource set (eg, a dedicated radio resource control state (RRC), etc. .) or a configuration associated with transmission pilots using a set of common resources (for example, a common RRC state, etc.). When operating in the dedicated RRC state, the UE can select a set of dedicated resources to transmit a pilot signal to a network. When operating in the common state of RRC, the UE can select a set of common resources to transmit a pilot signal to the network. In any case, a pilot signal transmitted by the UE can be received by one or more network access devices, such as an AN or DU or portions thereof. Each receiving network access device can be configured to receive and measure pilot signals transmitted in the common resource pool, and also receive and measure pilot signals transmitted in dedicated resource pools allocated to the UEs for which the network access device is. a member of a network access device monitoring suite for the UE. One or more of the receiving network access devices or a CU to which the receiving network access device (or devices) transmits the measurements of the pilot signals, can use the measurements to identify server cells to the UEs, or to initiate a change of server cell for one or more of the UEs. EXAMPLIFICATION BEAM REFINING PROCEDURES
    [0085] [0085] As noted above, in certain multi-beam systems (for example, millimeter-wave cellular systems (mmW)), it may be necessary for the beam formation to overcome high path losses. As described in this document, beam formation can refer to the establishment of a link between a BS and UE, in which both devices form a beam that corresponds to each other. Both BS and UE find at least one suitable beam to form a communication link. The BS beam and the UE beam form what is known as a beam pair link (BPL). As an example, in DL, a BS can use a transmit beam and an UE can use a receive beam that corresponds to the transmit beam to receive the transmission. The combination of a transmit beam and a corresponding receive beam can be a GLP.
    [0086] [0086] As part of a beam management, the beams that are used by BS and UE have to be refined from time to time because of alternating channel conditions, for example, due to the movement of the UE or other objects. Additionally, the performance of a GLP can be subject to fading due to Doppler dispersion. Due to channel conditions that alternate over time, GLP must be periodically updated or refined. Consequently, it can be beneficial if the BS and the UE monitor the beams and new GLPs.
    [0087] [0087] At least one GLP has to be established for network access. As described above, new BPLs may need to be discovered later for different purposes. The network may decide to use different BPLs for different channels, or to communicate with different BSs (TRPs) or as backup BPLs in case an existing BPL fails.
    [0088] [0088] The UE typically monitors the quality of a GLP and the network can refine a GLP from time to time.
    [0089] [0089] Figure 8 illustrates example 800 for the discovery and refining of GLP. In 5G-NR, the PI, P2 and P3 procedures are used for the discovery and refining of GLP. The network uses a PI procedure to enable the discovery of new GLPs. In the PI procedure, as shown in Figure 8, the BS transmits different symbols of a reference signal, each beam formed in a different spatial direction so that several (most, all) relevant cell locations are obtained. Defined in another way, the BS transmits beams that use different transmission beams over time in different directions.
    [0090] [0090] For the successful receipt of at least one symbol of this "PI signal", the UE must find a suitable receiving beam. It performs the search using available receiving beams and applies a different UE beam using each occurrence of the periodic PI signal.
    [0091] [0091] Once the UE has successfully received a symbol for the PI signal, it has found a GLP. The UE may not want to wait until it has found the best UE receiving beam, as this may further delay actions. The UE can measure the reference signal receiving power (RSRP) and report the symbol index together with the RSRP to the BS. Such a report will typically contain the findings of one or more GLPs.
    [0092] [0092] In one example, the UE can determine a received signal that has a high RSRP. The UE may not know which beam the BS used for transmission; however, the UE can report to BS the time in which it observed the signal that has a high RSRP. BS can receive this report and can determine which BS bundle BS used in the given time.
    [0093] [0093] BS can then offer the procedures of P2 and P3 to refine an individual GLP. The P2 procedure refines the BS beam of a GLP. The BS can transmit some symbols of a reference signal with different BS beams that are spatially close to the BS beam of the BPL (the BS performs a scan that uses neighboring beams around the selected beam). In P2, the UE keeps its beam constant. So, although the UE uses the same beam as in the GLP (as illustrated in procedure P2 in
    [0094] [0094] The P3 procedure refines the UE beam of a GLP (see procedure P3 in Figure 8). While the BS beam remains constant, the UE scans using different receiving beams (the UE scans using neighboring beams). The UE can measure the RSRP of each beam and can identify the best UE beam. After that, the UE can use the best UE beam for the BPL and can report the RSRP to the BS.
    [0095] [0095] Over time, BS and UE establish several GLPs. When the BS transmits a particular channel or signal, it lets the UE know which BPL will be involved, so that the UE can tune in the direction of the correct UE receiving beam before the signal starts. In this way, each sample of that signal or channel can be received by the UE using the correct receiving beam. In one example, the BS can indicate a programmed signal (SRS, CSI-RS) or channel (PDSCH, PDCCH, PUSCH, PUCCH) whose BPL is involved. In NR, this information is called a QCL indication.
    [0096] [0096] Two antenna ports are QCL if the properties of the channel on which a symbol on one antenna port is conducted can be inferred from the channel on which a symbol on the other antenna port is conducted. QCL supports at least beam management functionality, frequency shift / timing estimation functionality and RRM management functionality.
    [0097] [0097] BS can use a GLP that the UE has received in the past. The transmission beam for the signal to be transmitted and the signal previously received both point in the same direction or are QCL. The QCL indication may be required by the UE (in advance of the signal to be received) so that the UE can use a correct receiving beam for each signal or channel. Some QCL indications may be required from time to time when the BPL for a signal or channel changes and some QCL indications are required for each programmed instance. The QCL indication can be transmitted in the downlink control (DCI) information that can be part of the PDCCH channel. Due to the fact that DCIs are necessary to control information, it may be desirable that the number of bits needed to indicate the QCL is not very large. The QCL can be transmitted in a medium access control (MAC-CE) or radio resource control (RRC) element message.
    [0098] [0098] According to an example, whenever the UE reports a bundle of BS that it received with sufficient RSRP, and BS decides to use that BPL in the future, BS assigns it with a BPL tag. Consequently, two BPLs that have different BS bundles can be associated with different BPL tags. BPLs that are based on the same BS bundles can be associated with the same BPL tag. So, according to this example, the tag is a function of the BS beam of the GLP.
    [0099] [0099] As noted above, wireless systems, such as millimeter wave (mmW) systems, take gigabit speeds for cellular networks, due to the availability of large amounts of bandwidth. However, the unique challenge of heavy path loss faced by such wireless systems needs new techniques such as hybrid beam formation (analog and digital), which are not present in 3G and 4G systems. The hybrid beam formation can intensify the signal-to-noise (SNR) link / ratio calculation that can be exploited during RACH.
    [0100] [0100] In such systems, node B (NB) and user equipment (UE) can communicate through transmission beams formed in active beams. Active beams can be considered transmit (Tx) and receive (Rx) beams paired between the NB and UE that carry data and control channels such as PDSCH, PDCCH, PUSCH and PUCCH. As noted above, a transmit beam used by an NB and corresponding receive beam used by an UE for downlink transmissions can be referred to as a beam pair link (BPL). Similarly, a transmission beam used by an UE and a corresponding receiving beam used by an NB for uplink transmissions can also be referred to as a BPL.
    [0101] [0101] In order to deform the beam to function correctly, the NB may need to monitor beams using beam measurements performed (for example, based on reference signals transmitted by the NB) and feedback generated at the UE. For example, NB can monitor active beams that use signal measurements performed by UEs such as NR-SS, CSI-RS, DMRS-CSS and DMRS-USS. To do this, the NB can send the measurement request to the UE and can subsequently transmit one or more reference signals for measurement in the UE.
    [0102] [0102] Since the direction of a reference signal is unknown to the UE, the UE may need to evaluate several beams to obtain the best Rx beam for a given NB Tx beam. However, if the UE has to "sweep" through all of its Rx beams to perform measurements (for example, to determine the best Rx beam for a given NB Tx beam), the UE may incur significant delay measurement and impact on battery life. What's more, having to scan through all the Rx beams is a highly ineffective feature. Therefore, aspects of the present disclosure provide techniques to assist an UE when taking measurements of server and neighboring cells when using the Rx beam formation. EXAMPLIFICATIVE PARAMETER SETTING FOR PROCEDURE OF RLF INTENSIFIED BY APERIOID BFR TRIGGERS
    [0103] [0103] Aspects of the present disclosure, however, provide techniques that can help improve RLF performance by adjusting parameters (for example, metrics limits and cell quality rules for RLF timer triggers) based on the triggers of aperiodic BFR.
    [0104] [0104] As illustrated in Figure 9, in multi-beam systems, a radio link failure (RLF) procedure, based on radio link monitoring (RLM) measurements, can be enhanced by synchronizing triggers (IS ) and aperiodic out of sync (OSS). IS and OSS triggers can be initiated by a beam failure recovery (BFR) procedure. For RLM, at least periodic IS and OOS indications can be based on noise and interference to signal (SINR) metrics. Such metrics may include, for example, a hypothetical PDCCH (BLER) block error rate as in LTE. For a BFR procedure, at least the aperiodic indication (or indications) can be provided to assist with the radio link failure (RLF) procedure. For example, such aperiodic indications can be provided if the same RS is used for beam failure and RLM recovery procedures, at least.
    [0105] [0105] In some cases, there may be discrepancies between the cell quality metric used by the RLF procedure and the beam quality metric used by the BFR procedure. In some cases, these discrepancies can lead to ineffective RFL performance.
    [0106] [0106] An example of such inefficiency can be explained with reference to Figure 10. Figure 10 illustrates an exemplary RLF timer and triggers for starting the RLF timer. As illustrated, after a limit number of consecutive OOS indications (referred to as N310) for the primary cell (Pcell), a timer (referred to as a T310 timer) can be activated. After the T310 timer expires (for example, absent in several IS events detected), an RLF can be declared.
    [0107] [0107] As shown in Figure 11, however, it can result in unnecessary RLFs that are declared. Such unnecessary declarations can occur particularly in cases of “low SS block geometry” in which the UE is not obtainable by the beams that carry RS to RLM, but is obtainable by narrower beams that carry SS.
    [0108] [0108] As another example of inefficiency, in some cases, RFLs can be unnecessarily delayed. For example, as shown in Figure 12, the RLF timer can be stopped by receiving a limit number (N311) of consecutive IS indications for Pcell. Unfortunately, this can lead to an RLF being declared in cases when beam failure detection does occur and there are no candidate beams for recovery. This scenario is illustrated in Figure 13.
    [0109] [0109] Figure 14, however, illustrates exemplary 1400 operations that can be performed by a UE to intensify an RFL procedure and possibly avoid one or both of the inefficiencies described above. Operations 1400 can be performed, for example, by user equipment (for example, UE 120) that participates in beam-formed communications with a base station (for example, a gNB).
    [0110] [0110] Operations 1400 begin, in 1402, when performing the radio link monitoring (RLM) based on the reference signals (RS) transmitted with the use of a first set of beams. In 1404, the UE performs beam failure recovery (BFR) monitoring based on transmissions using a second set of beams.
    [0111] [0111] In 1406, the UE sets one or more radio link failure (RLF) parameters based on both RLM and BFR monitoring.
    [0112] [0112] Whether RLF parameters are adjusted prior to RLF detection or adjusted in response to RLF detection may depend on the specific scenario. For example, in some cases, the RLF parameters are adjusted in response to the detection of at least one of an out-of-sync (OOS) or in-sync (IS) BFR event. In other cases, the parameters can be adjusted and an event can be detected using the adjusted parameters (the parameters can then be further adjusted).
    [0113] [0113] Figure 15 illustrates an example of how an RLF timer can be started early, as an example of an adjusted RLF parameter, according to aspects of the present disclosure. As illustrated, the RLF procedure can be triggered early (for example, an early T310 timer start) by an aperiodic OOS event detected by BFR. The RLF procedure can be triggered by immediately starting the RLF timer or, in some cases, by starting the RLF timer before normal (for example, by reducing the limit number of OOS required to trigger the RLF procedure).
    [0114] [0114] As illustrated in Figure 16, in addition (or as an alternative), the detection of early RLF (for example, early termination of timer T310) can be triggered by aperiodic OOS via BFR. Again, early termination can be either immediate or earlier. In some cases, the triggering of
    [0115] [0115] As shown in Figure 17, in some cases, the RLF timer can be terminated early for RLF recovery (the T310 timer early termination), based on aperiodic synchronous (IS) detection by means of BFR. Early termination can be immediate or it can only cause termination to be earlier (for example, by reducing the number of consecutive IS probes needed to complete the LPR procedure).
    [0116] [0116] In some cases, one or more RLM parameters can be adjusted based on the BFR triggers. For example, there may be situations when the aperiodic IS / OOS triggers of the BFR procedures indicate an underlying discrepancy between RLM cell metric calculations and BFR beam quality metric calculations.
    [0117] [0117] In some cases, periodic IS indications of RLM procedure may be based on SS beams with a high detection limit. For example, the detection limits Qin and Qout can be used to monitor RLF Qout can be defined as the level at which the downlink radio link cannot be reliably received, while Qin can be defined as the level at which quality downlink radio link can be significantly more reliably received than in Qout. Due to the high detection limit, these beams can be difficult to detect for a UE located on a cell edge.
    [0118] [0118] As shown in Figure 18, however, the same cell-border UE can be served by a narrow PDCCH beam, which can be detected strongly through the BFR procedure. Therefore, lowering the RLF detection limit for SS beam detection can assist in faster RLF recovery. Figure 18 illustrates the boundaries for the different limits. Another option may be to adjust the cell metric calculation to include narrower CSI-RS beams.
    [0119] [0119] In another example, the periodic OOS indications of an RLM procedure may be based on SS beam transmissions with a long duty cycle, which may take longer to trigger the T310 timer (for example, especially with a high value of N310). In such cases, a cell-edge UE may be more likely to lose its beams faster compared to a cell-center UE. Therefore, different definitions of N310 can be used by different UEs.
    [0120] [0120] For example, as shown in Figure 19, cell center UEs can use higher N310 values, while cell edge UEs have lower N310 values. In some cases, gNB may explicitly flag N310 values that use RRC signaling (for example, based on EU measurement reports). In some cases, a list of possible N310 values may be announced by gNB, with guidelines (based on EU measurements) for which the value should be used under different cell quality metric calculations.
    [0121] [0121] In some cases, groups of values can be adjusted. For example, in some cases, not only N310, but also N311 values, can be EU specific (for example, and flagged using RRC signaling).
    [0122] [0122] Furthermore, the values of N311 may also depend on whether T310 started based on the OOS N310 or based on the aperiodic OOS. Some UEs can trigger the T310 timer based on the aperiodic OOS indication of the BFR procedure. In such cases, those UEs can use a smaller N311 for the faster transition to the RLF event.
    [0123] [0123] As described above, if an aperiodic OOS indication arrives while T310 is passing, this can “speed up” or “end immediately” the T310 timer. Similarly, the aperiodic OOS that arrives before the start of T310 can immediately start T310, or it can just cause a temporary reduction in the N310 value to allow for the potential early start of T310.
    [0124] [0124] The methods disclosed in this document comprise one or more steps or actions to achieve the described method. The steps and / or actions of the method can be interchanged with each other without departing from the scope of the claims. In other words, unless a specific order of steps or actions is specified, the order and / or use of specific steps and / or actions can be modified without departing from the scope of the claims.
    [0125] [0125] As used herein, a phrase that refers to "at least one of a list of items refers to any combination of those items, which include only members". As an example, “at least one of: a, b or c” is intended to cover a, b, c, -b, a- c, bc, and abc, as well as any combination with multiples of the same element (for example , aa, aaa, aa- b, aac, abb, a-cc, bb, bbb, bbc, cc, and ccc or any other order of a, bec).
    [0126] [0126] As used herein, the term "determining" covers a wide variety of actions. For example, "determining" may include calculating, computing, processing, deriving, investigating fetch (for example, fetching from a table, a database or another data structure), certifying and the like. Also, "what determines" can include receiving (for example, receiving information), accessing (for example, accessing data in a memory) and the like. Also, "determining" may include resolving, selecting, choosing, establishing and the like.
    [0127] [0127] The above disclosure is provided to allow anyone skilled in the art to practice the various aspects described in this document. Various changes in these aspects will be readily apparent to those skilled in the art, and the generic principles defined in this document can be applied to other aspects. Thus, the claims are not intended to limit the aspects shown in this document, but must be in accordance with the total scope consistent with the language of the claims, in which the reference to an element in the singular is not intended to mean “one and only one ”unless specifically established, but“ one or more ”instead. Unless otherwise stated, the term "some" refers to one or more. All structural and functional equivalents of the elements of the various aspects described throughout this disclosure that are shown or will become known subsequently by those of ordinary skill in the art are expressly incorporated into this document for reference and are intended to be covered for the claims. In addition, nothing disclosed in this document is intended to be dedicated to the public, regardless of whether such disclosure is explicitly mentioned in the claims. No element of the claim shall be construed under the provisions of 35 USC § 112, sixth paragraph, unless the element is expressly cited using the expression “means for” or, in the case of a method claim, the element is cited using the expression “step to”.
    [0128] [0128] The various method operations described above can be performed using any of the appropriate means capable of carrying out the corresponding functions. The means may include various hardware and / or software components and / or modules, which include, but are not limited to, a circuit, an application specific integrated circuit (ASIC) or a processor. In general, where there are operations illustrated in the Figures, these operations may have corresponding media components plus duplicate function with similar numbering.
    [0129] [0129] The various blocks, modules and illustrative logic circuits described in connection with the present disclosure can be implemented or carried out with a general purpose processor, a digital signal processor (DSP), an integrated circuit for specific application (ASIC), an array of programmable field gates (FPGA) or other programmable logic device (PDL), discrete gate or transistor logic, hardware components or any combination thereof designed to perform the functions described in this document. A general purpose processor can be a microprocessor, but alternatively, the processor can be any commercially available processor, controller, microcontroller or state machine. A processor can also be deployed as a combination of computing devices, for example, a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
    [0130] [0130] If deployed on hardware, an exemplary hardware configuration can comprise a processing system on a wireless node. The processing system can be deployed with a bus architecture. The bus can include any number of interconnect buses and bridges that depend on the specific application of the processing system and general design constraints. The bus can join multiple circuits including a processor, machine-readable media and a bus interface. The bus interface can be used to connect a network adapter, among other things, to the processing system via the bus. The network adapter can be used to implement the PHY layer signal processing functions. In the case of a 120 user terminal (see Figure 1), a user interface (for example, numeric keypad, display, mouse, joystick, etc.) can also be connected to the bus. The bus can also connect several other circuits such as timing sources, peripherals, voltage regulators, power management circuits and the like, which are well known in the art and, therefore, will not be described further. The processor can be deployed with one or more processors for general purposes and / or for specific purposes. Examples include microprocessors, microcontrollers, DSP processors and other circuitry that can run software. Those skilled in the art will recognize how to best deploy the functionality described for the processing system depending on the specific application and the general design restrictions imposed on the system in general.
    [0131] [0131] If implemented in software, functions can be stored or transmitted using one or more instructions or codes in a computer-readable medium. The software should be widely interpreted as instructions, data or any combination thereof, regardless of whether it is referred to as software, firmware, middleware, microcode, hardware description language or otherwise. Computer-readable media includes both computer storage media and communication media that includes any means that facilitates the transfer of a computer program from one place to another The processor may be responsible for the management of the bus and general processing, including execution software modules stored on machine-readable storage media. A computer-readable storage medium can be coupled to a processor so that the processor can read the information from the storage medium and write the information on it. Alternatively, the storage medium can be integral to the processor. For example, machine-readable media may include a transmission line, a data-modulated carrier wave and / or a computer-readable storage medium with instructions stored on it separate from the wireless node, all of which can be accessed by the processor through the bus interface. Alternatively or additionally, the machine-readable media or any portion of it can be integrated into the processor, as in the case where it can be with cache and / or general log files. Examples of machine-readable storage media may include, for example, RAM (Random Access Memory), flash memory, ROM (Read-Only Memory), PROM (Programmable Read-Only Memory), EPROM (Memory-Only Memory) Programmable and Erasable Read), EEPROM (Electrically Programmable and Erasable Read Only Memory), records, magnetic disks, optical disks, hard drives or any other suitable storage medium or any combination thereof. Machine-readable media can be incorporated into a computer program product.
    [0132] [0132] A computer software module can comprise a single instruction, or many instructions, and can be distributed across several different code segments, between different programs and across multiple storage media. Computer-readable media can comprise numerous software modules. The software modules include instructions that, when executed by a device such as a processor, cause the processing system to perform various functions. Software modules can include a transmit module and a receive module. Each software module can reside on a single storage device or can be distributed across multiple storage devices. For example, a software module can be loaded into RAM from a hard drive when a trigger event occurs. During the execution of the software module, the processor can load some of the instructions to the cache to increase the access speed. One or more lines of cache can then be loaded into a general log file for execution by the processor. When referring to the functionality of a software module below, it will be understood that such functionality is implemented by the processor when executing instructions from that software module.
    [0133] [0133] Also, any connection is properly called a computer-readable medium. For example, if the software is transmitted from a website, server or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) or wireless technologies such as infrared (IR), radio and microwave, then coaxial cable, fiber optic cable, twisted pair, DSL or wireless technologies such as infrared, radio and microwave are included in the definition of medium. The magnetic disc and optical disc, as used in this document, include compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disc and Blu-ray® disc, where magnetic discs normally reproduce data magnetically, while optical discs reproduce data optically with lasers. Thus, in some respects, computer-readable media may comprise non-transitory computer-readable media (for example, tangible media). In addition, for other aspects, computer-readable media may comprise transitory computer-readable media (for example, a signal). The combinations of the aforementioned should also fall within the scope of computer-readable media.
    [0134] [0134] Thus, certain aspects may comprise a computer program product to carry out the operations presented in this document. For example, such a computer program product may comprise a computer-readable medium that has instructions stored (and / or encoded) in it, the instructions being executable by one or more processors to perform the operations described in this document. For example, the instructions for carrying out the operations described in this document and in the attached Figures.
    [0135] [0135] In addition, it should be noted that the modules and / or other appropriate means to carry out the methods and techniques described in this document can be downloaded and / or otherwise obtained by a user terminal and / or station -based, if applicable. For example, such a device can be coupled to a server to facilitate the transfer of means to carry out the methods described in this document. Alternatively, various methods described in this document can be provided by means of storage media (for example, RAM, ROM, a physical storage medium such as a compact disc (CD) or floppy disk, etc.), such that a user terminal and / or base station can obtain the various methods by coupling or supplying the storage media to the device. In addition, any other suitable technique for providing the methods and techniques described in this document for a device can be used.
    [0136] [0136] It should be understood that the claims are not limited to the precise configuration and components illustrated above. Various modifications, alterations and variations can be made to the arrangement, operation and details of the methods and apparatus described above without departing from the scope of the claims.
    权利要求:
    Claims (28)
    [1]
    1. Method for wireless communications by a user equipment (UE) which comprises: performing radio link monitoring (RLM) based on the reference signals (RS) transmitted using a first set of beams; perform beam failure recovery (BFR) monitoring based on transmissions using a second set of beams; and adjust one or more radio link failure (RLF) parameters based on both RLM and BFR monitoring.
    [2]
    A method according to claim 1, which further comprises: performing the RLF detection based on the adjusted RLF parameters.
    [3]
    3. Method according to claim 1, wherein: the RLF parameters are adjusted in response to the detection of at least one of a BFR event out of synchronization (OOS) or in synchronization (IS).
    [4]
    4. Method according to claim 1, in which the performance of radio link failure (RLF) detection based on RLM and BFR monitoring comprises: adjusting an RLF detection limit in response to the detection of an event of BRF IS.
    [5]
    5. The method of claim 1, wherein the adjustment comprises: adjusting the cell metric calculations to include narrower CSI-RS beams in response to the detection of a BRF IS event.
    [6]
    6. Method according to claim 1, wherein the adjustment comprises: using the detection of RLF parameters determined based on the measurements performed by the UE.
    [7]
    A method according to claim 6, wherein the detection of RLF parameters comprises at least one of a limit number of out-of-sync RLM events (OOS) to trigger the initiation of an RLF timer or a limit number synchronization (IS) events to trigger the termination of the RLF timer.
    [8]
    A method according to claim 7, wherein one or more values are signaled by a base station.
    [9]
    9. Method according to claim 8, in which: the UE selects from among the flagged values based on the cell quality metric calculations.
    [10]
    10. Apparatus for wireless communications through user equipment (UE) which comprises: means for performing radio link monitoring (RLM) based on the reference signals (RS) transmitted using a first set of beams; means for performing beam failure recovery (BFR) monitoring based on transmissions using a second set of beams; and means for adjusting one or more radio link failure (RLF) parameters based on both RLM and BFR monitoring.
    [11]
    Apparatus according to claim 10, which further comprises: means for carrying out RLF detection based on the adjusted RLF parameters.
    [12]
    Apparatus according to claim 10, wherein: the RLF parameters are adjusted in response to the detection of at least one of an out-of-sync (OOS) or in-sync (IS) BFR event.
    [13]
    Apparatus according to claim 10, wherein the means for performing radio link failure (RLF) detection based on RLM and BFR monitoring comprises: means for adjusting an RLF detection limit in response the detection of a BRF IS event.
    [14]
    Apparatus according to claim 10, wherein the means for adjusting comprises: means for adjusting cell metric calculations to include narrower CSI-RS beams in response to the detection of a BRF IS event.
    [15]
    Apparatus according to claim 10, wherein the means for adjusting comprises: means for using the detection of RLF parameters determined based on the measurements performed by the UE.
    [16]
    An apparatus according to claim 15, wherein the detection of RLF parameters comprises at least one of a limit number of out-of-sync RLM events (OOS) to trigger the initiation of an RLF timer or a limit number synchronization (IS) events to trigger the termination of the RLF timer.
    [17]
    Apparatus according to claim 16, wherein one or more values are signaled by a base station.
    [18]
    18. Apparatus according to claim 17, in which: the UE selects from among the signaled values based on the cell quality metric calculations.
    [19]
    19. Apparatus for wireless communications through user equipment (UE) comprising: a receiver configured to receive reference (RS) signals transmitted using a first set of beams; and at least one processor configured to perform radio link monitoring (RLM) based on RS, perform beam failure recovery (BFR) monitoring based on transmissions using a second set of beams, and adjust one or more radio link failure (RLF) parameters based on both RLM and BFR monitoring.
    [20]
    Apparatus according to claim 19, wherein the at least one processor is additionally configured to perform RLF detection based on the adjusted RLF parameters.
    [21]
    21. Apparatus according to claim 19, wherein: the RLF parameters are adjusted in response to the detection of at least one of a BFR event out of synchronization (OOS) or in synchronization (IS).
    [22]
    22. Apparatus according to claim 19,
    where at least one processor is configured to perform radio link failure (RLF) detection based on both RLM and BFR monitoring by setting an RLF detection threshold in response to the detection of a BRF IS event .
    [23]
    23. Apparatus according to claim 19, wherein the at least one processor is configured to adjust cell metric calculations to include narrower CSI-RS beams in response to the detection of a BRF IS event.
    [24]
    24. Apparatus according to claim 19, wherein the adjustment comprises: using the detection of RLF parameters determined based on the measurements performed by the UE.
    [25]
    An apparatus according to claim 24, wherein the detection of RLF parameters comprises at least one of a limit number of out-of-sync RLM events (OOS) to trigger the initiation of an RLF timer or a limit number synchronization (IS) events to trigger the termination of the RLF timer.
    [26]
    26. Apparatus according to claim 25, wherein one or more values are signaled by a base station.
    [27]
    27. Apparatus according to claim 26, in which: the UE selects from among the signaled values based on the cell quality metric calculations.
    [28]
    28. Computer readable medium that has instructions stored on it for:
    perform the radio link monitoring (RLM) based on the reference signals (RS) transmitted using a first set of beams; perform beam failure recovery (BFR) monitoring based on transmissions using a second set of beams; and adjust one or more radio link failure (RLF) parameters based on both RLM and BFR monitoring.
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    同族专利:
    公开号 | 公开日
    KR20200030546A|2020-03-20|
    CA3066898A1|2019-01-31|
    EP3659389A1|2020-06-03|
    WO2019023075A1|2019-01-31|
    US10680700B2|2020-06-09|
    US20190028174A1|2019-01-24|
    JP2020528697A|2020-09-24|
    CN111034337A|2020-04-17|
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