A method and apparatus for performing a random access

Abstract

The present disclosure relates to a 5G communication system or a 6G communication system for supporting higher data rates beyond a 4G communication system such as long term evolution (LTE). The invention relates to a method and device for random access. According to at least one embodiment of the present disclosure, there is provided a method performed by a first device in a communication system, comprising: transmitting a first message related to random access procedure to a base station to request measurement of a reference signal; receiving a second message related to random access procedure or a PDCCH for scheduling the second message from a base station to obtain fourth information related to measurement configuration of the reference signal; performing measurement of the reference signal based on the fourth information to obtain a measurement result; and reporting the measurement result.

Description

A METHOD AND APPARATUS FOR PERFORMING A RANDOM ACCESS

[0001] The present disclosure relates to the field of wireless communication, and more specifically, to a method and device related to random access.

[0002] 5G mobile communication technologies define broad frequency bands such that high transmission rates and new services are possible, and can be implemented not only in "Sub 6GHz" bands such as 3.5GHz, but also in "Above 6GHz" bands referred to as mmWave including 28GHz and 39GHz. In addition, it has been considered to implement 6G mobile communication technologies (referred to as Beyond 5G systems) in terahertz bands (for example, 95GHz to 3THz bands) in order to accomplish transmission rates fifty times faster than 5G mobile communication technologies and ultra-low latencies one-tenth of 5G mobile communication technologies.

[0003] At the beginning of the development of 5G mobile communication technologies, in order to support services and to satisfy performance requirements in connection with enhanced Mobile BroadBand (eMBB), Ultra Reliable Low Latency Communications (URLLC), and massive Machine-Type Communications (mMTC), there has been ongoing standardization regarding beamforming and massive MIMO for mitigating radio-wave path loss and increasing radio-wave transmission distances in mmWave, supporting numerologies (for example, operating multiple subcarrier spacings) for efficiently utilizing mmWave resources and dynamic operation of slot formats, initial access technologies for supporting multi-beam transmission and broadbands, definition and operation of BWP (BandWidth Part), new channel coding methods such as a LDPC (Low Density Parity Check) code for large amount of data transmission and a polar code for highly reliable transmission of control information, L2 pre-processing, and network slicing for providing a dedicated network specialized to a specific service.

[0004] Currently, there are ongoing discussions regarding improvement and performance enhancement of initial 5G mobile communication technologies in view of services to be supported by 5G mobile communication technologies, and there has been physical layer standardization regarding technologies such as V2X (Vehicle-to-everything) for aiding driving determination by autonomous vehicles based on information regarding positions and states of vehicles transmitted by the vehicles and for enhancing user convenience, NR-U (New Radio Unlicensed) aimed at system operations conforming to various regulation-related requirements in unlicensed bands, NR UE Power Saving, Non-Terrestrial Network (NTN) which is UE-satellite direct communication for providing coverage in an area in which communication with terrestrial networks is unavailable, and positioning.

[0005] Moreover, there has been ongoing standardization in air interface architecture / protocol regarding technologies such as Industrial Internet of Things (IIoT) for supporting new services through interworking and convergence with other industries, IAB (Integrated Access and Backhaul) for providing a node for network service area expansion by supporting a wireless backhaul link and an access link in an integrated manner, mobility enhancement including conditional handover and DAPS (Dual Active Protocol Stack) handover, and two-step random access for simplifying random access procedures (2-step RACH for NR). There also has been ongoing standardization in system architecture / service regarding a 5G baseline architecture (for example, service based architecture or service based interface) for combining Network Functions Virtualization (NFV) and Software-Defined Networking (SDN) technologies, and Mobile Edge Computing (MEC) for receiving services based on UE positions.

[0006] As 5G mobile communication systems are commercialized, connected devices that have been exponentially increasing will be connected to communication networks, and it is accordingly expected that enhanced functions and performances of 5G mobile communication systems and integrated operations of connected devices will be necessary. To this end, new research is scheduled in connection with eXtended Reality (XR) for efficiently supporting AR (Augmented Reality), VR (Virtual Reality), MR (Mixed Reality) and the like, 5G performance improvement and complexity reduction by utilizing Artificial Intelligence (AI) and Machine Learning (ML), AI service support, metaverse service support, and drone communication.

[0007] Furthermore, such development of 5G mobile communication systems will serve as a basis for developing not only new waveforms for providing coverage in terahertz bands of 6G mobile communication technologies, multi-antenna transmission technologies such as Full Dimensional MIMO (FD-MIMO), array antennas and large-scale antennas, metamaterial-based lenses and antennas for improving coverage of terahertz band signals, high-dimensional space multiplexing technology using OAM (Orbital Angular Momentum), and RIS (Reconfigurable Intelligent Surface), but also full-duplex technology for increasing frequency efficiency of 6G mobile communication technologies and improving system networks, AI-based communication technology for implementing system optimization by utilizing satellites and AI (Artificial Intelligence) from the design stage and internalizing end-to-end AI support functions, and next-generation distributed computing technology for implementing services at levels of complexity exceeding the limit of UE operation capability by utilizing ultra-high-performance communication and computing resources.

[0008] The present invention has been made to address at least the above problems and / or disadvantages and to provide at least the advantages described below. Accordingly, an aspect of the present invention provides a method and apparatus for performing a random access.

[0009] In accordance with an aspect of the disclosure, a method performed by a customer premises equipment (CPE) in a communication system is provided. The method includes transmitting, to a base station, a message 1 (Msg1) including channel state information reference signal (CSI-RS) measurement request information; receiving, from the base station, a message 2 (Msg2) including CSI-RS configuration information; based on the CSI-RS configuration information, measuring a CSI-RS; and transmitting, to the base station, a message 3 (Msg3) including a measurement result of the CSI-RS.

[0010] In accordance with an aspect of the disclosure, a method performed by base station is provided. The method includes receiving, from a customer premises equipment (CPE), a message 1 (Msg1) including channel state information reference signal (CSI-RS) measurement request information; transmitting, to the CPE, a message 2 (Msg2) including CSI-RS configuration information; transmitting, to the CPE, a CSI-RS; and receiving, from the CPE, a message 3 (Msg3) including a result of the CSI-RS measurement.

[0011] In accordance with an aspect of the disclosure, a customer premises equipment (CPE) is provided. The CPE comprises at least one transceiver; at least one processor communicatively coupled to the at least one transceiver; and at least one memory, communicatively coupled to the at least one processor, storing instructions executable by the at least one processor individually or in any combination to cause the terminal to: transmit, to a base station, a message 1 (Msg1) including channel state information reference signal (CSI-RS) measurement request information, receive, from the base station, a message 2 (Msg2) including CSI-RS configuration information, based on the CSI-RS configuration information, measure a CSI-RS, and transmit, to the base station, a message 3 (Msg3) including a measurement result of the CSI-RS.

[0012] In accordance with an aspect of the disclosure, a base station is provided. The base station comprises at least one transceiver; at least one processor communicatively coupled to the at least one transceiver; and at least one memory, communicatively coupled to the at least one processor, storing instructions executable by the at least one processor individually or in any combination to cause the terminal to: receive, from a customer premises equipment (CPE), a message 1 (Msg1) including channel state information reference signal (CSI-RS) measurement request information, transmit, to the CPE, a message 2 (Msg2) including CSI-RS configuration information, transmit, to the CPE, a CSI-RS, and receive, from the CPE, a message 3 (Msg3) including a result of the CSI-RS measurement.

[0013] Advantages, and salient features of the invention will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the annexed drawings, discloses exemplary embodiments of the invention. For more enhanced communication system, there is a need for method and network for performing a random access.

[0014] FIG. 1 illustrates an example wireless network according to an embodiment of the present disclosure;

[0015] FIG. 2 illustrates an example base station according to an embodiment of the present disclosure;

[0016] FIG. 3 illustrates an example user equipment according to an embodiment of the present disclosure;

[0017] FIG. 4 illustrates an example structure diagram of CPE;

[0018] FIG. 5 illustrates a schematic diagram of a terminal receiving SSB;

[0019] FIG. 6 illustrates a schematic diagram of CPE interacting with a base station;

[0020] FIG. 7 illustrates a schematic diagram of CPE interacting with a base station;

[0021] FIG. 8 illustrates an example flow chart of a method performed by CPE;

[0022] FIG. 9 illustrates a schematic diagram of CPE interacting with a base station;

[0023] FIG. 10 illustrates a schematic diagram of CPE interacting with a base station;

[0024] FIG. 11A illustrates a schematic diagram of CPE interacting with a base station;

[0025] FIG. 11B illustrates a schematic diagram of CPE interacting with a base station;

[0026] FIG. 12 illustrates a schematic diagram of CPE interacting with a base station;

[0027] FIG. 13 illustrates a structural schematic diagram of a first device according to at least one embodiment of the present disclosure;

[0028] FIG. 14 illustrates a schematic structural diagram of a network device (e.g., a base station) according to at least one embodiment of the present disclosure;

[0029] FIG. 15 illustrates a schematic flowchart of a method performed by a terminal (e.g., CPE) according to at least one embodiment of the present disclosure;

[0030] FIG. 16 illustrates a schematic flowchart of a method performed by a terminal (e.g., CPE) according to at least one embodiment of the present disclosure;

[0031] FIG. 17 illustrates schematic diagrams of two-step measurement result reporting according to an embodiment of the present disclosure;

[0032] FIG. 18 illustrates schematic diagrams of two-step measurement result reporting according to an embodiment of the present disclosure.

[0033] Considering the development of wireless communication from generation to generation, the technologies have been developed mainly for services targeting humans, such as voice calls, multimedia services, and data services. Following the commercialization of 5th-generation (5G) communication systems, it is expected that the number of connected devices will exponentially grow. Increasingly, these will be connected to communication networks. Examples of connected things may include vehicles, robots, drones, home appliances, displays, smart sensors connected to various infrastructures, construction machines, and factory equipment. Mobile devices are expected to evolve in various form-factors, such as augmented reality glasses, virtual reality headsets, and hologram devices. In order to provide various services by connecting hundreds of billions of devices and things in the 6th-generation (6G) era, there have been ongoing efforts to develop improved 6G communication systems. For these reasons, 6G communication systems are referred to as beyond-5G systems.

[0034] 6G communication systems, which are expected to be commercialized around 2030, will have a peak data rate of tera (1,000 giga)-level bps and a radio latency less than 100μsec, and thus will be 50 times as fast as 5G communication systems and have the 1 / 10 radio latency thereof.

[0035] In order to accomplish such a high data rate and an ultra-low latency, it has been considered to implement 6G communication systems in a terahertz band (for example, 95GHz to 3THz bands). It is expected that, due to severer path loss and atmospheric absorption in the terahertz bands than those in mmWave bands introduced in 5G, technologies capable of securing the signal transmission distance (that is, coverage) will become more crucial. It is necessary to develop, as major technologies for securing the coverage, radio frequency (RF) elements, antennas, novel waveforms having a better coverage than orthogonal frequency division multiplexing (OFDM), beamforming and massive multiple input multiple output (MIMO), full dimensional MIMO (FD-MIMO), array antennas, and multiantenna transmission technologies such as large-scale antennas. In addition, there has been ongoing discussion on new technologies for improving the coverage of terahertz-band signals, such as metamaterial-based lenses and antennas, orbital angular momentum (OAM), and reconfigurable intelligent surface (RIS).

[0036] Moreover, in order to improve the spectral efficiency and the overall network performances, the following technologies have been developed for 6G communication systems: a full-duplex technology for enabling an uplink transmission and a downlink transmission to simultaneously use the same frequency resource at the same time; a network technology for utilizing satellites, high-altitude platform stations (HAPS), and the like in an integrated manner; an improved network structure for supporting mobile base stations and the like and enabling network operation optimization and automation and the like; a dynamic spectrum sharing technology via collision avoidance based on a prediction of spectrum usage; an use of artificial intelligence (AI) in wireless communication for improvement of overall network operation by utilizing AI from a designing phase for developing 6G and internalizing end-to-end AI support functions; and a next-generation distributed computing technology for overcoming the limit of user equipment (UE) computing ability through reachable super-high-performance communication and computing resources (such as mobile edge computing (MEC), clouds, and the like) over the network. In addition, through designing new protocols to be used in 6G communication systems, developing mechanisms for implementing a hardware-based security environment and safe use of data, and developing technologies for maintaining privacy, attempts to strengthen the connectivity between devices, optimize the network, promote softwarization of network entities, and increase the openness of wireless communications are continuing.

[0037] It is expected that research and development of 6G communication systems in hyper-connectivity, including person to machine (P2M) as well as machine to machine (M2M), will allow the next hyper-connected experience. Particularly, it is expected that services such as truly immersive extended reality (XR), high-fidelity mobile hologram, and digital replica could be provided through 6G communication systems. In addition, services such as remote surgery for security and reliability enhancement, industrial automation, and emergency response will be provided through the 6G communication system such that the technologies could be applied in various fields such as industry, medical care, automobiles, and home appliances.

[0038] According to at least one embodiment of the present disclosure, there is provided a method performed by a first device in a communication system, comprising:

[0039] transmitting a first message related to random access procedure to a base station to request measurement of a reference signal;

[0040] receiving a second message related to random access procedure or a PDCCH for scheduling the second message from the base station to obtain fourth information related to measurement configuration of the reference signal;

[0041] performing measurement of the reference signal based on the fourth information to obtain a measurement result; and

[0042] reporting the measurement result.

[0043] In an implementation, the first message is message 1, message 3, or message A in random access procedure, and the first message includes indication information indicating requesting measurement of the reference signal.

[0044] In an implementation, the indication information includes 1 bit or multiple bits,

[0045] in case that the indication information includes multiple bits, the multiple bits are also used to indicate recommended reference signal index.

[0046] In an implementation, the recommended reference signal index includes at least one of: a reference signal index associated with a previously used beam, a reference signal index associated with a measurement result obtained from a previous measurement during random access procedure.

[0047] In an implementation, one bit of the multiple bits for indicating a recommended reference signal index is used to indicate whether the recommended reference signal index is related to a previously used reference signal index or to a measurement result obtained by measuring a reference signal in the random access procedure.

[0048] In an implementation, if message 4 in the random access procedure indicates contention failure, the first message is transmitted to the base station, wherein the indication information indicates requesting measurement of the reference signal.

[0049] In an implementation, if message 4 in the random access procedure indicates contention failure, the first message is transmitted to the base station, wherein the indication information indicates not requesting measurement of the reference signal.

[0050] In an implementation, if the indication information includes multiple bits, the indication information is also used to indicate a recommended reference signal index.

[0051] In an implementation, the first message is message 1 or message A in random access procedure, and

[0052] the first message uses a preamble for a first type and / or is transmitted on a random access occasion (RO) for the first type, and the type of the first device is the first type.

[0053] In an implementation, if message 4 in the random access procedure indicates contention failure, transmitting the first message to the base station, wherein the first message uses a preamble for the first type and / or is transmitted on an RO for the first type.

[0054] In an implementation, if message 4 in the random access procedure indicates contention failure, transmitting the first message to the base station, wherein the first message uses a first preamble and / or is transmitted on a first RO,

[0055] wherein, the first preamble includes a preamble other than preambles for the first type, or a preamble other than preambles for requesting measurement of the reference signal among preambles for the first type, or a preamble for not requesting measurement of the reference signal among preambles for the first type,

[0056] wherein, the first RO includes a RO other than ROs for the first type, or a RO other than ROs for requesting measurement of the reference signal among ROs for the first type, or a RO for not requesting measurement of the reference signal among ROs for the first type.

[0057] In an implementation, the second message includes message 2 or message 4 or message B in random access procedure,

[0058] wherein the fourth information includes first information of the measurement configuration or information indicating the measurement configuration of a configuration information set, wherein the first information includes part or all information of the measurement configuration.

[0059] In an implementation, the method further comprises obtaining the configuration information set,

[0060] wherein the configuration information set is predefined or obtained through system information.

[0061] In an implementation, obtaining the configuration information set through system information comprises:

[0062] transmitting a third message to the base station, the third message is for requesting system information including the configuration information set;

[0063] receiving system information including the configuration information set through a fourth message.

[0064] In an implementation, the third message is the first message, wherein the first message includes fourth indication information for requesting the configuration information set, or the first message is transmitted through a preamble for requesting the configuration information set, and / or

[0065] wherein the fourth message is the second message.

[0066] In an implementation, the preambles for requesting the configuration information set is obtained through system information carried in SSB.

[0067] In an implementation, the measurement configuration includes at least one of: configuration information related to measurement of the reference signal, configuration information related to measurement result reporting of the reference signal, and trigger information for measurement of the reference signal and reporting of the measurement result.

[0068] In an implementation, the measurement configuration further includes second information, which is predefined or preconfigured.

[0069] In an implementation, the first information includes at least one of: resource configuration information for the reference signal, bandwidth information for the measurement of the reference signal, information related to measurement time of the reference signal, information related to reporting time of measurement result of the reference signal,

[0070] the second information includes at least one of: information related to resource type of the reference signal, resources of the reference signal, information related to measurement content, type of measurement result reporting, content of measurement result reporting.

[0071] In an implementation, reporting the measurement result comprises:

[0072] if the first message is message A, reporting the measurement result through message B in random access procedure; or

[0073] if the first message is message 1, reporting the measurement result through message 3 in random access procedure; or

[0074] if the first message is message 3, then:

[0075] reporting the measurement result through resources scheduled by third information, wherein the third information is received through message 4 or received after ACK for message 4 is transmitted, or

[0076] reporting the measurement result through PUCCH for ACK for message 4.

[0077] In an implementation, reporting the measurement result includes reporting a first measurement result through a first uplink signaling related to random access and reporting a second measurement result through a second uplink signaling related to random access.

[0078] In an implementation, if a measurement result whose power measurement value is larger than a threshold among measurement results corresponding to the first measurement result exists, the first measurement result is reported in the first signaling, for example, the first measurement result is the measurement result with the largest power measurement value among the measurement results corresponding to the first measurement result; Otherwise, information indicating that no measurement result meeting the threshold exists is reported.

[0079] In an implementation, the first signaling is msg3, the second signaling is the signaling sent on the PUCCH channel together with the ACK (or called msg5), or the second signaling is msg3 in the next random access attempt after contention failure.

[0080] In an implementation, the first signaling is msg5, and the second signaling is a signal on scheduled PUSCH after msg5.

[0081] In an implementation, the first measurement result is the measurement result with the largest power measurement value among partial measurement results, and the second measurement result is the measurement result with the largest power measurement value among all measurement results, and the first measurement result and the second measurement result are associated with the same beam or different beams.

[0082] In an implementation, the method further includes receiving information related to a method for requesting measurement of the reference signal, for example, the information is determined by information included and / or indicated by SSB sent by the base station.

[0083] According to at least one embodiment of the present disclosure, there is provided a method performed by a base station in a communication system, comprising:

[0084] receiving a first message related to random access procedure, wherein the first message requests measurement of a reference signal;

[0085] transmitting fourth information related to measurement configuration of the reference signal to the first device through a second message related to random access procedure or a PDCCH for scheduling the second message;

[0086] receiving measurement result of the reference signal reported by the first device.

[0087] According to at least one embodiment of the present disclosure, there is provided a first device in a communication system, comprising:

[0088] a transceiver configured to transmit and / or receive signals;

[0089] a controller configured to control the first device to perform the method according to at least one embodiment of the present disclosure.

[0090] According to at least one embodiment of the present disclosure, there is provided a base station in a communication system, comprising:

[0091] a transceiver configured to transmit and / or receive signals;

[0092] a controller configured to control the base station to perform the method according to at least one embodiment of the present disclosure.

[0093] Before undertaking the DETAILED DESCRIPTION below, it may be advantageous to set forth definitions of certain words and phrases used throughout this patent document. The term "couple" and its derivatives refer to any direct or indirect communication between two or more elements, whether those elements are in physical contact with one another. The terms "transmit," "receive," and "communicate," as well as derivatives thereof, encompass both direct and indirect communication. The terms "include" and "comprise," as well as derivatives thereof, mean inclusion without limitation. The term "or" is inclusive, meaning and / or. The phrase "associated with," as well as derivatives thereof, means to include, be included within, interconnect with, contain, be contained within, connect to or with, couple to or with, be communicable with, cooperate with, interleave, juxtapose, be proximate to, be bound to or with, have, have a property of, have a relationship to or with, or the like. The term "controller" means any device, system or part thereof that controls at least one operation. Such a controller may be implemented in hardware or a combination of hardware and software and / or firmware. The functionality associated with any particular controller may be centralized or distributed, whether locally or remotely. The phrase "at least one of," when used with a list of items, means that different combinations of one or more of the listed items may be used, and only one item in the list may be needed. For example, "at least one of: A, B, and C" includes any of the following combinations: A, B, C, A and B, A and C, B and C, and A and B and C. Likewise, the term "set" means one or more. Accordingly, a set of items can be a single item or a collection of two or more items.

[0094] Moreover, various functions described below can be implemented or supported by one or more computer programs, each of which is formed from computer readable program code and embodied in a computer readable medium. The terms "application" and "program" refer to one or more computer programs, software components, sets of instructions, procedures, functions, objects, classes, instances, related data, or a portion thereof adapted for implementation in a suitable computer readable program code. The phrase "computer readable program code" includes any type of computer code, including source code, object code, and executable code. The phrase "computer readable medium" includes any type of medium capable of being accessed by a computer, such as read only memory (ROM), random access memory (RAM), a hard disk drive, a compact disc (CD), a digital video disc (DVD), or any other type of memory. A "non-transitory" computer readable medium excludes wired, wireless, optical, or other communication links that transport transitory electrical or other signals. A non-transitory computer readable medium includes media where data can be permanently stored and media where data can be stored and later overwritten, such as a rewritable optical disc or an erasable memory device.

[0095] Definitions for other certain words and phrases are provided throughout this patent document. Those of ordinary skill in the art should understand that in many if not most instances, such definitions apply to prior as well as future uses of such defined words and phrases.

[0096] The figures included herein, and the various embodiments used to describe the principles of the present disclosure are by way of illustration only and should not be construed in any way to limit the scope of the disclosure. Further, those skilled in the art will understand that the principles of the present disclosure may be implemented in any suitably arranged wireless communication system.

[0097] FIGS. 1-3 below describe various embodiments of the present disclosure implemented in wireless communications systems. The descriptions of FIGS. 1-3 are not meant to imply physical or architectural limitations to the manner in which different embodiments may be implemented. Different embodiments of the present disclosure may be implemented in any suitably-arranged communications system.

[0098] FIG. 1 illustrates an example wireless network according to embodiments of the present disclosure. The embodiment of the wireless network shown in FIG. 1 is for illustration only. Other embodiments of the wireless network 100 could be used without departing from the scope of the present disclosure.

[0099] As shown in FIG. 1, the wireless network includes a base station (next generation nodeB, gNB or gNodeB) 101, a gNB 102, and a gNB 103. The gNB 101 communicates with the gNB 102 and the gNB 103. The gNB 101 also communicates with at least one network 130, such as the Internet, a proprietary Internet Protocol (IP) network, or other data network.

[0100] The gNB 102 provides wireless broadband access to the network 130 for a first plurality of user equipments (UEs) within a coverage area 120 of the gNB 102. The first plurality of UEs includes a UE 111, which may be located in a small business; a UE 112, which may be located in an enterprise (E); a UE 113, which may be located in a WiFi hotspot (HS); a UE 114, which may be located in a first residence (R1); a UE 115, which may be located in a second residence (R2); and a UE 116, which may be a mobile device (M), such as a cell phone, a wireless laptop, a wireless personal digital assistant (PDA), or the like. The gNB 103 provides wireless broadband access to the network 130 for a second plurality of UEs within a coverage area 125 of the gNB 103. The second plurality of UEs includes the UE 115 and the UE 116, as well as subscriber stations (SS, for example, UEs) 117, 118 and 119. In some embodiments, one or more of the gNBs 101-103 may communicate with each other and with the UEs 111-116 using existing wireless communication techniques, and one or more of the UE 111-119 may communicate directly with each other (e.g., UEs 117-119) using other existing or proposed wireless communication techniques.

[0101] Depending on the network type, the term "base station" or "BS" can refer to any component (or collection of components) configured to provide wireless access to a network, such as transmit point (TP), transmit-receive point (TRP), an enhanced (or "evolved") base station (eNodeB or eNB), a 5G base station (gNB), a macrocell, a femtocell, a wireless fidelity (WiFi) access point (AP), or other wirelessly enabled devices. Base stations may provide wireless access in accordance with one or more wireless communication protocols, e.g., 3GPP 5G New Radio (NR), Long Term Evolution (LTE), LTE Advanced (LTE-A), high speed packet access (HSPA), Wi-Fi 802.11a / b / g / n / ac, etc. For the sake of convenience, the various names for a base station-type apparatus and functionality are used interchangeably in this patent document to refer to network infrastructure components that provide wireless access to remote terminals. Also, depending on the network type, the term "user equipment" (UE) can refer to any component such as a mobile station (MS), subscriber station (SS), remote terminal, wireless terminal, receive point, or user device. For the sake of convenience, the various names for a user equipment-type device and functionality are used interchangeably in this patent document to refer to remote wireless equipment that wirelessly accesses a BS, whether the UE is a mobile device (such as a mobile telephone or smartphone) or is normally considered a stationary device (such as a desktop computer or vending machine).

[0102] Dotted lines show the approximate extents of the coverage areas 120 and 125, which are shown as approximately circular for the purposes of illustration and explanation only. It should be clearly understood that the coverage areas associated with gNBs, such as the coverage areas 120 and 125, may have other shapes, including irregular shapes, depending upon the configuration of the gNBs and variations in the radio environment associated with natural and man-made obstructions.

[0103] As described in more detail below, one or more of the UEs 111-119 include circuitry, programing, or a combination thereof. In certain embodiments, and one or more of the gNBs 101-103 includes circuitry, programing, or a combination thereof.

[0104] Although FIG. 1 illustrates one example of a wireless network, various changes may be made to FIG. 1. For example, the wireless network could include any number of gNBs and any number of UEs in any suitable arrangement. Also, the gNB 101 could communicate directly with any number of UEs and provide those UEs with wireless broadband access to the network 130. Similarly, each gNB 102-103 could communicate directly with the network 130 and provide UEs with direct wireless broadband access to the network 130. Further, the gNBs 101, 102, and / or 103 could provide access to other or additional external networks, such as external telephone networks or other types of data networks.

[0105] FIG. 2 illustrates an example base station according to embodiments of the present disclosure. The embodiment of the gNB 102 illustrated in FIG. 2 is for illustration only, and the gNBs 101 and 103 of FIG. 1 could have the same or similar configuration. However, gNBs come in a wide variety of configurations, and FIG. 2 does not limit the scope of the present disclosure to any particular implementation of a gNB.

[0106] As shown in FIG 2, the gNB 102 includes multiple antennas 200a-200n, multiple radio frequency (RF) transceivers 201a-201n, transmit (TX) processing circuitry 203, and receive (RX) processing circuitry 204. The gNB 102 also includes a controller / processor 205, a memory 206, and a backhaul or network interface 207.

[0107] The RF transceivers 201a-201n receive, from the antennas 200a-200n, incoming RF signals, such as signals transmitted by UEs in the network 100. The RF transceivers 201a-201n down-convert the incoming RF signals to generate intermediate frequency (IF) or baseband signals. The IF or baseband signals are transmitted to the RX processing circuitry 204, which generates processed baseband signals by filtering, decoding, and / or digitizing the baseband or IF signals. The RX processing circuitry 204 transmits the processed baseband signals to the controller / processor 205 for further processing.

[0108] The TX processing circuitry 203 receives analog or digital data (such as voice data, web data, electronic mail, or interactive video game data) from the controller / processor 205. The TX processing circuitry 203 encodes, multiplexes, and / or digitizes the outgoing baseband data to generate processed baseband or IF signals. The RF transceivers 201a-201n receive the outgoing processed baseband or IF signals from the TX processing circuitry 203 and up-converts the baseband or IF signals to RF signals that are transmitted via the antennas 201a-201n.

[0109] The controller / processor 205 can include one or more processors or other processing devices that control the overall operation of the gNB 102. For example, the controller / processor 205 could control the reception of forward channel signals and the transmission of reverse channel signals by the RF transceivers 201a-201n, the RX processing circuitry 204, and the TX processing circuitry 203 in accordance with well-known principles. The controller / processor 205 could support additional functions as well, such as more advanced wireless communication functions.

[0110] For instance, the controller / processor 205 could support beam forming or directional routing operations in which outgoing signals from multiple antennas 200a-200n are weighted differently to effectively steer the outgoing signals in a desired direction. Any of a wide variety of other functions could be supported in the gNB 102 by the controller / processor 205.

[0111] The controller / processor 205 is also capable of executing programs and other processes resident in the memory 206, such as an operating system (OS). The controller / processor 205 can move data into or out of the memory 206 as required by an executing process.

[0112] The controller / processor 205 is also coupled to the backhaul or network interface 207. The backhaul or network interface 207 allows the gNB 102 to communicate with other devices or systems over a backhaul connection or over a network. The interface 207 could support communications over any suitable wired or wireless connection(s). For example, when the gNB 102 is implemented as part of a cellular communication system (such as one supporting 5G, LTE, or LTE-A), the interface 207 could allow the gNB 102 to communicate with other gNBs over a wired or wireless backhaul connection. When the gNB 102 is implemented as an access point, the interface 207 could allow the gNB 102 to communicate over a wired or wireless local area network or over a wired or wireless connection to a larger network (such as the Internet). The interface 207 includes any suitable structure supporting communications over a wired or wireless connection, such as an Ethernet or RF transceiver.

[0113] The memory 206 is coupled to the controller / processor 205. Part of the memory 206 could include a random access memory (RAM), and another part of the memory 206 could include a Flash memory or other read only memory (ROM).

[0114] Although FIG. 2 illustrates one example of gNB 102, various changes may be made to FIG. 2. For example, the gNB 102 could include any number of each component shown in FIG. 2. As a particular example, an access point could include a number of interfaces 207, and the controller / processor 205 could support routing functions to route data between different network addresses. As another particular example, while shown as including a single instance of TX processing circuitry 203 and a single instance of RX processing circuitry 204, the gNB 102 could include multiple instances of each (such as one per RF transceiver). Also, various components in FIG. 2 could be combined, further subdivided, or omitted and additional components could be added according to particular needs.

[0115] FIG. 3 illustrates an example user equipment according to embodiments of the present disclosure. The embodiment of the UE 116 illustrated in FIG. 3 is for illustration only, and the UEs 111-115 and 117-119 of FIG. 1 could have the same or similar configuration. However, UEs come in a wide variety of configurations, and FIG. 3 does not limit the scope of the present disclosure to any particular implementation of a UE.

[0116] As shown in FIG. 3, the UE 116 includes an antenna 301, a radio frequency (RF) transceiver 302, TX processing circuitry 303, a microphone 304, and receive (RX) processing circuitry 305. The UE 116 also includes a speaker 306, a controller or processor 307, an input / output (I / O) interface (IF) 308, an input device 309, a touchscreen display 310, and a memory 311. The memory 311 includes an OS 312 and one or more applications 313.

[0117] The RF transceiver 302 receives, from the antenna 301, an incoming RF signal transmitted by a gNB of the network 100. The RF transceiver 302 down-converts the incoming RF signal to generate an IF or baseband signal. The IF or baseband signal is transmitted to the RX processing circuitry 305, which generates a processed baseband signal by filtering, decoding, and / or digitizing the baseband or IF signal. The RX processing circuitry 305 transmits the processed baseband signal to the speaker 306 (such as for voice data) or to the processor 307 for further processing (such as for web browsing data).

[0118] The TX processing circuitry 303 receives analog or digital voice data from the microphone 304 or other outgoing baseband data (such as web data, e-mail, or interactive video game data) from the processor 307. The TX processing circuitry 303 encodes, multiplexes, and / or digitizes the outgoing baseband data to generate a processed baseband or IF signal. The RF transceiver 302 receives the outgoing processed baseband or IF signal from the TX processing circuitry 303 and up-converts the baseband or IF signal to an RF signal that is transmitted via the antenna 301.

[0119] The processor 307 can include one or more processors or other processing devices and execute the OS 312 stored in the memory 311 in order to control the overall operation of the UE 116. For example, the processor 307 could control the reception of forward channel signals and the transmission of reverse channel signals by the RF transceiver 302, the RX processing circuitry 305, and the TX processing circuitry 303 in accordance with well-known principles. In some embodiments, the processor 307 includes at least one microprocessor or microcontroller.

[0120] The processor 307 is also capable of executing other processes and programs resident in the memory 311, such as processes for channel state information (CSI) reporting on uplink channel. The processor 307 can move data into or out of the memory 311 as required by an executing process. In some embodiments, the processor 307 is configured to execute the applications 313 based on the OS 312 or in response to signals received from gNBs or an operator. The processor 307 is also coupled to the I / O interface 308, which provides the UE 116 with the ability to connect to other devices, such as laptop computers and handheld computers. The I / O interface 308 is the communication path between these accessories and the processor 307.

[0121] The processor 307 is also coupled to the touchscreen display 310. The user of the UE 116 can use the touchscreen display 310 to enter data into the UE 116. The touchscreen display 310 may be a liquid crystal display, light emitting diode display, or other display capable of rendering text and / or at least limited graphics, such as from web sites.

[0122] The memory 311 is coupled to the processor 307. Part of the memory 311 could include RAM, and another part of the memory 311 could include a Flash memory or other ROM.

[0123] Although FIG. 3 illustrates one example of UE 116, various changes may be made to FIG. 3. For example, various components in FIG. 3 could be combined, further subdivided, or omitted and additional components could be added according to particular needs. As a particular example, the processor 307 could be divided into multiple processors, such as one or more central processing units (CPUs) and one or more graphics processing units (GPUs). Also, while FIG. 3 illustrates the UE 116 configured as a mobile telephone or smartphone, UEs could be configured to operate as other types of mobile or stationary devices.

[0124] With the rapid development of mobile communication technology, higher requirements are put forward for the transmission rate of the network. During the deployment and development of 5G / 6G technology, the advantages of high-frequency communication are obvious, but it also exposes some problems, such as large transmission loss, small coverage, large power consumption and high cost, especially in millimeter wave, THz and other bands. These problems, to a certain extent, limit the large-scale application of millimeter-wave communication, and only a few countries can provide corresponding frequency band services at present.

[0125] The transmission distance of the signal is inversely proportional to the operating frequency. For the same transmission power at base station and the same transmission distance, the higher the frequency of the transmitted signal, the greater the transmission path loss and the weaker the signal strength received by the terminal. In order to meet the complete coverage of high-frequency signals, it can be achieved by increasing the transmission power at base stations or increasing the construction density of base stations, but the equipment cost and energy consumption at base stations will rise sharply, which will become a major obstacle to the large-scale commercialization of high-frequency communication.

[0126] FWA (fixed wireless access) is a technology that uses CPE (customer premises equipment) device to realize broadband connection in a relatively fixed location by receiving and forwarding the signal of base stations of mobile operators. The fixed wireless access supporting 5G technology provides the potential of ultra-high speed, low delay and large capacity for the next generation wireless connection. In addition to home users, FWA can provide economical and convenient broadband access for small and micro enterprises, shops and temporary places, and gradually begin to enter the industrial Internet field in factories, parks, mines, ports and other scenes, providing high-speed and low-latency 5G connections for IOT terminals within the region.

[0127] In some areas where optical fiber and other wired cables cannot be laid (cost reasons, road rights reasons, building protection reasons, etc.), FWA can provide users with network access. It avoids the construction work such as road right acquisition, pipeline excavation, cable laying and wall perforation, greatly simplifies the process network connection, shortens the construction period and saves the cost. Therefore, for many operators, FWA is a means to rapidly develop the scale of users, and it is also a very cost-effective business model. From the perspective of social significance, FWA can help families in economically underdeveloped areas to quickly have network connections, enjoy information dividends and improve their quality of life. In addition, in rural areas, the main market of FWA, there is usually extra spectrum capacity due to the low population density.

[0128] FIG. 4 illustrates an example structure diagram of CPE. An example CPE device includes two parts: a receiving module 401 that communicates with a base station and a forwarding module 402 that communicates with other terminals, as shown in FIG. 4 below. The receiving module 401 can communicate with the base station as a terminal, receive data from the base station, or transmit data to the base station; a signal forwarding module 402, which functions like a network hotspot, provides services for one or more terminals in a designated area, transmits data obtained from the signal receiving module 401 to different terminals, or receives information transmitted by different terminals and forwards the same to the base station through the signal receiving module 401; the signal forwarding module 402 is connected with the signal receiving module 401, and transmits uplink data to the signal receiving module or receives downlink data obtained from the signal receiving module. The signal receiving module 401 and the signal forwarding module 402 may be two modules of CPE or two functions of one module. The connection between the base station and the signal receiving module 401 is wireless, and the connection between the signal forwarding module 402 and the terminal can be wired or wireless, such as through network cable, WiFi, mobile network, optical fiber, etc.

[0129] The inventors realized that the existing beam management process did not make full use of the relatively fixed position of CPE and base station in FWA-related communication. Only using the original beam management process to measure the reference signal for beam management, for the communication system of FWA technology, the system efficiency needs to be improved. The invention provides a method for CPE to communicate with a base station, and the methods of the disclosed embodiment is described with reference to FIGs. 5 to 14. The invention relates to a related process of communication between a signal receiving module of CPE and a base station. The receiving module 401 for communication between CPE and the base station is usually installed in a fixed position, such as a wall, a pole, a roof, etc. Therefore, the relative position and transmission path between CPE and the base station change little, and the probability of connection interruption is low. Based on such information, the related processes (for example, SSB reception and measurement, random access, beam management) in the connection process with the base station can be simplified, the connection time can be shortened, the signaling overhead can be reduced, and the resource utilization rate can be improved.

[0130] FIG. 5 illustrates a schematic diagram of a terminal receiving SSB. When the terminal has data transmission requirements, initial access is first performed to obtain available wide beam pairs for transmission and reception. During this process, the broadcast signal carried by the transmit beam of the base station is periodically swept in different directions, and the transmitted content is SSB (synchronization signal / (physical broadcast channel) PBCH block), and different SSBs in a period are distinguished by SSB index; the receive beam of the terminal periodically attempts to receive in different directions, as shown in FIG. 5 below. The terminal measures the received SSB. If the power measurement value RSRP (reference signal receiving power) of the SSB meets the threshold condition (for example, RSRP > threshold power), it is considered that the SSB meets the transmission requirements. The terminal thinks that the beam pair composed of the transmit beam of the base station corresponding to the SSB and the receive beam used by the terminal when receiving the SSB can be used as the beam pair for communication between the terminal and the base station. Therefore, SSBs are transmitted continuously and periodically. In order to ensure complete coverage of the cell by SSBs and consider the time required for multiple transmissions, SSBs are transmitted using wide beams with low gain.

[0131] Thereinto, the synchronization information (including PSS, Primary Synchronization Signal, and SSS, Secondary Synchronization Signal) in SSB includes cell physical ID (PCID, cell ID) information, and system information in the broadcast channel (PBCH, physical Broadcast Channel) in SSB includes SSB index, RO (RACH occasions) location information, time-frequency resource information, etc. The terminal transmits preamble information (preamble, also called msg1) to the base station by the receive beam used by the terminal, on the RO time-frequency resources associated with the SSB, through PRACH channel (physical random access channel), and uses this receive beam to receive random access response information (RAR, also called msg2) transmitted by the base station. If the UE successfully receives the random access response information of the base station, and the random access radio network temporary identifier (RA-RNTI) in the information is consistent, based on the information carried in the received msg2, the terminal transmits uplink information (msg3) to the base station, which includes the identity information (TC-RNTI, Temporary cell RNTI) of the terminal. Based on the received msg3 information, the base station transmits a response information (msg4) containing the terminal identity information to resolve the contention among multiple users. The terminal attempts to receive msg4 on PDSCH. When the identity information contained in msg4 received by the terminal is consistent with the terminal identity information, it is determined that the terminal has successfully accessed to the base station, and the acknowledgement (ACK) information of the successful access is fed back to the base station on PUCCH (Physical Uplink Control Channel). If the identity information contained in the msg4 received by the terminal is inconsistent with the terminal identity information, the terminal regenerates a preamble and repeats the process from msg1 to msg4 until it successfully receives the msg4 with consistent identity information transmitted by the base station.

[0132] At this time, the beam used for communication between the base station and the terminal is a wide beam, with small signal gain, short transmission distance and low data transmission efficiency. In order to meet the demand of high-speed transmission, it is necessary to manage the beam after the terminal successfully accesses to the base station, and obtain a high-gain narrow beam pair for communication between the base station and the terminal by measurement of narrow beams. The base station uses different narrow beams to transmit channel state information reference signals (CSI-RS), and informs the terminal of information such as the time-frequency resources where the CSI-RS is located, reporting content and so on (for example, CSI-Measconfig) through specific signaling, and configures the terminal to perform measurement and report of CSI-RS transmitted by different narrow beams (for example, notifying the reporting time of measurement). Thereinto, the resources used by narrow beams in different directions transmitted by the base station correspond to CSI-RS index (CRI), and the terminal only needs to report the measurement result of CSI-RS on the specified time-frequency resources, so that the base station can determine the transmit and / or receive narrow beams for communication between the base station and the terminal. Thereinto, the content reported by the terminal can be CSI-RS identity information (for example, CSI-RS index) and corresponding measurement result (for example, RSRP), and the reported beams can be the beams corresponding to the top M CSI-RSs with the largest measured power (M>0 and M is an integer, and the value of M can be configured by other nodes).

[0133] In the present invention, when the type of the terminal connected to the base station is fixed wireless access-related equipment (such as CPE), the transmission path of beams for communication between the base station and CPE changes little, and the probability of communication interruption is low, so that the number of times of measuring the signal transmission quality of the transmission path can be reduced to reduce the related signaling overhead. For example, the period of two adjacent measurements for monitoring the signal transmission quality may be lengthened, or the signal transmission quality of the transmission path may not be monitored. If the base station does not configure monitoring of the signal transmission quality of the transmission path, it only needs to configure the measurement and reporting of CSI-RS for one round of beam management to determine the narrow beam pair. If the connection between CPE and the base station is interrupted due to the change of signal transmission quality, the access process is directly initiated to obtain a new available beam pair for communication with the base station. Or the narrow beam (for example, a candidate beam reported by the measurement in random access procedure) is re-measured to determine a new narrow beam for communication and quickly complete the beam recovery.

[0134] In some implementations, the terminal may determine which way is to be used to perform fast beam recovery based on the beam strength measurement result in the transmission direction.

[0135] In some implementations, the terminal determines the size of change in the environment in the beam transmission path through the comparison between the change value of the measurement result of the beam strength and a specific threshold, so as to determine whether the data transmission quality may be restored through new measurement. The new beam measurement may be a re-measurement of the candidate beams reported in the previous period, and a new communication beam is selected from the candidate beams according to the measurement result. When the transmission quality of a beam in the transmission direction of the terminal deteriorates, the terminal may determine whether it is necessary to resend a measurement request (for example, on-demand CSI-RS measurement request) based on the comparison result, so as to quickly recover the beam.

[0136] In some implementations, the terminal determines whether a new beam for transmission may be quickly obtained through new measurement by the time difference between the timing point where the beam quality is deteriorated and the time point when the measurement result of the candidate beam is obtained. For example, the terminal receives time window configuration information configured by the base station, which indicates the validity time window for its candidate beam measurement result and the starting time point of the time window. If the time of transmit beam failure is within the validity time window, it is considered that the terminal may quickly restore the data transmission quality by requesting on demand measurement.

[0137] If one-time measurement and measurement result reporting of CSI-RS for CPE is configured, it corresponds to aperiodic CSI-RS resource transmission and aperiodic measurement result reporting. In an implementation, the base station needs to separately transmit configuration signaling for configuring resources of CSI-RS measurement and content to report and DCI (Downlink Control Information) for triggering the of transmitting CSI-RS measurement and reporting.

[0138] According to the embodiment of the present disclosure, the CSI-RS measurement and reporting process for beam management can be combined with the random access process, so as to reduce the signaling overhead of CSI-RS measurement and shorten the time of the connection process between the terminal and the base station. When the terminal type is a terminal with little change in spatial position, such as CPE, the CSI-RS measurement results at different times are similar due to the little change of transmission path, so CSI-RS measurement and reporting can be configured only once, which greatly reduces the signaling overhead introduced by transmission quality monitoring and improves transmission efficiency.

[0139] This method is suitable for terminals with little location changes, such as (CPE), or terminals with low delay packet data transmission requirements. The terminal may determine whether it needs to perform narrow beam measurement in random access procedure to quickly obtain a high-gain communication beam, based on its own mobile characteristics and / or transmission requirements.

[0140] The method provided by the present disclosure will be described in detail with example embodiments by taking CPE as an example.

[0141] Embodiment 1

[0142] When CPE knows that its terminal type is CPE, it can transmit CSI-RS measurement request information to the base station in random access procedure to request the base station to configure resources for measuring CSI-RS of the CPE and / or reporting measurement results, and to transmit related configuration information for resources of CSI-RS measurement and measurement result reporting to CPE. Based on such method, CPE can complete beam management based on CSI-RS measurement in random access procedure, obtain the high-gain narrow beam pair for communication between base station and CPE, shorten the time for CPE to obtain a beam for data transmission with high-gain, and improve the information transmission rate.

[0143] In this embodiment, the "CSI-RS measurement request information" can be transmitted in msg1 in random access procedure, and the form of CSI-RS measurement request information can be explicit indication information. For example, the CSI-RS measurement request information may be one bit or multiple bits of indication information. If one bit of indication information is used, "0" means that CSI-RS measurement is not requested, and "1" means that CSI-RS measurement is requested. If the indication information of multiple bits is used, when all bits of the multiple bits are 0, it means that the CPE does not request CSI-RS measurement, and the base station does not need to configure resources and information related to CSI-RS measurement; when all bits in the CSI-RS measurement request information received by the base station are 1, it means that the CPE requests CSI-RS measurement, and the base station needs to configure resources and information related to CSI-RS measurement; when all bits of the CSI-RS measurement request information received by the base station are other values than all 0 and all 1, the base station can perform other behaviors related to beam management according to the pre-agreed meaning of this information, for example, this information is used to determine whether CSI-RS measurement has been configured during this round of access, and the specific content of CSI-RS measurement related information configured by the base station. Its detailed description will be described in Embodiment 2 below with an example of "N bits". According to whether the received msg1 contains CSI-RS measurement request information, the base station determines whether it needs to transmit CSI-RS related configuration information in the subsequent signaling of random access, transmits CSI-RS based on the configuration information, receives the measurement result of CSI-RS, and adjusts the beam for communication with CPE based on the measurement result.

[0144] Optionally, the CSI-RS measurement request information transmitted by the CPE to the base station may be expressed in an implicit form. For example, the base station informs CPE of specific information and / or CPE stores specific information before random access, the specific information such as CPE-specific preamble, CPE-specific random access RO, etc. By receiving the specific information contained in msg1 transmitted by the terminal, the base station determines whether the type of terminal transmitting the random access request msg1 is CPE and / or whether the CPE requests CSI-RS measurement. The specific information (or called CPE-specific information) can be agreed between the base station and the terminal (including CPE) in advance and / or stored in the storage module of the CPE and the base station, or can be transmitted or indicated in the system information of SSB. This implicit form of CSI-RS measurement request does not need to change the sequence length and generation mode of preamble, and has high compatibility with existing communication systems. When the base station determines that the terminal transmitting msg1 is CPE or CPE requests CSI-RS measurement, it configures the CSI-RS measurement related process for beam management, that is, the base station transmits CSI-RS related configuration information for configuring the terminal to measure and report the CSI-RS transmitted by the base station, and transmits CSI-RS based on the configuration information, receives the measurement result of CSI-RS, and determines the narrow beam pair for communication with CPE.

[0145] Optionally, the random access resources (RO, preamble, etc.) dedicated to the CPE may be on-demand resources. For example, the resources may be activated by specific information and used for random access procedure of CPE. In some embodiments, the CPE may obtain related information required for activation (for example, an activated dedicated preamble) through system information, and the base station may activate the resources by sending specific information (before the CPE sends a PRACH of random access, the base station may send activation signaling of using the dedicated preamble).

[0146] The base station receives the random access request msg1 transmitted by the terminal, and determines whether it needs to configure CSI-RS measurement for the terminal according to the information in msg1. For example, if msg1 contains explicit and / or implicit CSI-RS measurement request information, the base station determines whether it needs to transmit CSI-RS related configuration information to the CPE and transmit CSI-RS related configuration information, the configuration information includes at least one of related configuration information for CSI-RS measurement, related configuration information for measurement result reporting of CSI-RS, trigger signaling (such as DCI trigger signaling) for measurement and measurement result reporting of CSI-RS. For example, the CSI-RS related configuration information may include at least one of: the time-frequency location of CSI-RS measurement resources, the content of CSI-RS measurement, the resources for CSI-RS measurement result reporting, the content for CSI-RS measurement result reporting, whether to perform CSI-RS measurement, the time for CSI-RS measurement, and the time T2 for CSI-RS measurement result reporting. Wherein, the related configuration information for CSI-RS measurement includes at least one of: the type of CSI-RS resources (for example, periodic, semi-periodic, or aperiodic), resources of CSI-RS (NZP-CSI-RS(Non-Zero Power CSI-RS), CSI-IM (CSI interference measurement), CSI-SSB, or ZP-CSI-RS(Zero Power CSI-RS)), resource configuration information of CSI-RS (or, resource mapping information, for example, density of CSI-RS resources, start location in time domain and / or frequency domain, the number of antenna ports, the type of code division multiplexing CDM (Code Division Multiplexing)), bandwidth information (BWP, Bandwidth Part), measurement content (at least one of RSRP, CRI, CQI (CQI-channel quality indication), RI (rank indication) and PMI (Precoding Matrix Indicator)); the related configuration information for CSI-RS measurement result reporting includes at least one of: the type of measurement result reporting (periodic, semi-periodic or aperiodic) and the content of measurement result reporting (at least one of RSRP, CRI, CQI, RI and PMI); the DCI trigger signaling for measurement and measurement result reporting of CSI-RS includes at least one of: indication information (for example, CSI request) of whether to perform CSI-RS measurement, time T1 (or called time offset T1) of CSI-RS measurement, and time T2 (or called time offset T2) of measurement result reporting of CSI-RS. In an implementation, all or part of the above information can be obtained from parameters configured by other nodes (for example, CSI measurement configuration configured through RRC (Radio Resource Control), such as CSI-MeasConfig), or stored in the storage unit of CPE in advance.

[0147] Because the relative position of the base station and CPE changes little, the type of resources in such CSI-RS related configuration information can be aperiodic CSI-RS (one-time CSI-RS measurement, the base station only transmits a group of signals for CSI-RS measurement), and correspondingly, the type of measurement result reporting can also be aperiodic CSI-RS measurement result reporting, so as to reduce signaling overhead and improve resource utilization.

[0148] Optionally, in order to prevent the waste of time and signaling overhead resulted from CPE failing to successfully receive a set of signals for CSI-RS measurement transmitted by the base station within the specified time, it can be configured that the type of resources in CSI-RS related configuration information can be semi-periodic CSI-RS. The base station transmits multiple sets of signals for CSI-RS measurement, with the corresponding configuration information the same. CPE only needs to measure and report the measurement result of the first set of CSI-RSs that can be received. Thereinto, for the number of repetitions of semi-periodic CSI-RS, the factors such as signaling overhead and the time when CPE receives the configuration signaling and the like can be comprehensively considered. The trigger signaling for measurement and / or measurement result reporting of CSI-RS can be transmitted in msg2.

[0149] Optionally, after CPE measures a set of CSI-RS, it may not continue to measure the CSI-Rs subsequently transmitted by the base station; or, after receiving a set of CSI-RS measurement results, the base station may not parse other measurement results reported by the same CPE in the present round of random access procedure.

[0150] The CSI-RS related configuration information can be transmitted by the base station to CPE through msg2 in random access procedure, and CPE can convert the received MAC (Medium Access Control) layer information of msg2 into physical layer information, and read the specific content of CSI-RS related configuration information.

[0151] Optionally, the CSI-RS related configuration information transmitted by the base station to CPE can be transmitted in a physical downlink control channel (PDCCH) through DCI information indicating msg2, thus shortening the time for receiving and reducing the data content to be parsed in the physical layer. Wherein, the DCI can indicate the time-frequency resource location for the terminal to receive msg2 of the base station.

[0152] Optionally, in order to reduce the signaling overhead of the CSI-RS related configuration information, part of the CSI-RS related configuration information and random access signaling can be combined, or simplified configuration signaling dedicated to CSI-RS measurement (for example, CSI-MeasConfig-CPE) for beam management of CPE can be designed. Specifically, part of the CSI-RS related configuration information can be stored in CPE in advance, and it is not necessary to carry relevant contents in the configuration signaling transmitted by the base station. For example, the type of CSI-RS measurement is aperiodic or semi-periodic, the resource of CSI-RS is NZP-CSI-RS, the measurement content is RSRP, the type of measurement result reporting is aperiodic, and the content of measurement result reporting is RSRP and CRI. Then the CSI-RS related configuration information can be simplified to CSI-RS related configuration signaling dedicated to beam management of CPE, and only contains at least one of the following contents: resource configuration information of CSI-RS (for example, density, start location in time domain and / or frequency domain, the number of antenna ports, the type of CDM multiplexing), bandwidth information (BWP), time T1 of CSI-RS measurement, and time T2 of CSI-RS measurement result reporting.

[0153] Optionally, multiple groups of CSI-RS related configuration information can be combined into a CSI-RS related configuration information set (or information of configuration set) and transmitted to CPE or stored in a storage module of CPE in advance, or only the indication information of the CSI-RS related configuration information (for example, CSI-Measconfig index) can be transmitted in msg2. According to the indication information of CSI-RS related configuration information contained in msg2 transmitted from the base station, CPE can determine the CSI-RS resource configuration used for the current CSI-RS measurement and the configuration information for CSI-RS measurement result reporting, further reducing the signaling overhead for transmitting CSI-RS related configuration information.

[0154] Optionally, the specific contents of the multiple groups of CSI-RS-related configuration information set can be transmitted in system information (for example, through SIB-CPE, where SIB-CPE represents a system information block (SIB) for CPE, and SIB-CPE may include multiple groups of CSI-RS related configuration information or a CSI-RS related configuration information set. It can be understood that SIB-CPE can also be expressed by other names). When there is no CPE access requirement, in order to avoid signaling overhead caused by continuous broadcasting of CPE-specific system information, the system information can be obtained in the form of non-broadcasting, and the terminal actively requests the base station to transmit detailed information on demand. For the form in which the terminal requests the base station to transmit the system information, it can be directly transmitting the request information of the system information, or requesting the base station to transmit the system information using a dedicated preamble, based on information in SSB. For example, FIG. 6 illustrates a schematic diagram of interaction between a CPE and a base station. In an implementation, the SSB broadcast by the base station only carries the indication information of the SIB-CPE, and the CPE requests the base station to transmit multiple groups of CSI-RS related configuration information contained in the specific SIB-CPE according to the indication information in the SSB, and the CPE can determine the CSI-RS related configuration information used in the current measurement according to the indication information of the CSI-RS related configuration information transmitted by the base station.

[0155] Optionally, the system information transmitted by the base station can be transmitted in msg2 or msg4 in random access procedure to reduce the signaling overhead.

[0156] As shown in FIG. 6, during the interaction between a CPE and a base station (e.g., gNB), in step 601, the CPE transmits a message 1(MSG1) and a SIB-CPE request to the base station, and the SIB-CPE request is used to request, from the base station, SIB-CPE, such as a CSI-RS related configuration information set. In an implementation, the SIB-CPE request can be transmitted through message 1 or can be transmitted separately from message 1;

[0157] In step 602, the base station transmits message 2 (MSG2) and indication information of CSI-RS related configuration information to CPE, the indication information is used to indicate configuration information among the CSI-RS related configuration information set;

[0158] In step 603, the base station transmits the requested SIB-CPE information to CPE in response to the SIB-CPE request transmitted by CPE, the information includes the CSI-RS related configuration information set. Step 603 may be performed before or after step 602, or they may be performed substantially simultaneously.

[0159] In an implementation, CPE can obtain the corresponding dedicated preamble for requesting the on-demand SIB-CPE information according to the system information carried in SSB. In an implementation, the dedicated preamble for requesting on-demand SIB-CPE information may be consistent with the dedicated preamble for requesting CSI-RS measurement. As shown in FIG. 6 below, if the request for on-demand SIB-CPE information is transmitted in msg1 in random access procedure, for example, by using a dedicated preamble to indicate the request information of SIB-CPE, when the base station receives msg1 transmitted by the terminal using the dedicated preamble, it can determine that the terminal type is CPE, and directly transmits indication information of CSI-RS related configuration for beam management in msg2 and transmits SIB-CPE information containing CSI-RS related configuration information set requested by CPE. CPE determines a CSI-RS related configuration information set containing a plurality of CSI-RS related configuration information based on the received two pieces of information, and determines the CSI-RS related configuration used for the current CSI-RS measurement according to the indication information of the CSI-RS related configuration information. Thereinto, the transmitting order of msg2 and SIB-CPE is not limited, and the requested SIB-CPE information can be transmitted before or after msg2.

[0160] Optionally, in order to further simplify the content of the CSI-RS related configuration information, some parameters in the configuration information can be fixed, such as the density, start location in time domain and / or frequency domain, the number of antenna ports, CDM multiplexing type and other contents in the resource configuration information of CSI-RS, and the fixed configuration information can be transmitted or stored in the storage module of CPE in advance.

[0161] Optionally, in some cases, one SSB only corresponds to a fixed set of CSI-RS related configuration information, and CPE can determine the CSI-RS related configuration information used for CSI-RS measurement according to SSB identification information (SSB ID) obtained by initial access, and the base station does not need to transmit additional indication information of CSI-RS related configuration information, thus further reducing signaling overhead.

[0162] CPE successfully received msg2 and obtained CSI-RS related configuration information contained and / or indicated in the information of msg2, so as to determine information such as the time, resources, type and the like of measurement and / or measurement result reporting of CSI-RS. The base station transmits CSI-RS resources for measurement after a certain time after transmitting msg2, and CPE starts to measure CSI-RS at the time-frequency resource location indicated by the base station at T1 after receiving msg2 according to the obtained CSI-RS configuration information, and obtains the measurement result. The measurement result includes one or more measured CSI-RS reference signal power values (RSRP) and corresponding CSI-RS indication information (CSI-RS index, CRI). The time T1 for CPE to receive and measure CSI-RS transmitted by the base station can be transmitted in msg2 or stored in the base station and CPE as a fixed value in advance. The time T1 (or called time offset T1) for the CPE to perform CSI-RS measurement configured by the base station can be calculated from the time when the base station transmits msg2, or it can be calculated from the time when the base station transmits the requested SIB-CPE. The value of the time T1 is related to factors such as the signal transmission distance between the base station and CPE, time for signal reception and data analysis by CPE and the like.

[0163] CPE reports the measurement result through msg3 according to the obtained CSI-RS measurement result and the related configuration information for aperiodic reporting for CSI-RS in the CSI-RS related configuration information transmitted by the base station. In this embodiment, after receiving msg2, CPE can perform CSI-RS measurement according to the configuration information carried and / or indicated by msg2, and transmit the measurement result to the base station through msg3, and the base station does not need to inform CPE of the time T2 of CSI-RS measurement result reporting, so the signaling overhead is reduced. The content of the measurement result of CSI-RS includes at least one of: identification information of CSI-RS (CRI), measured power value, and the number of CSI-RS included in the measurement result can be one or more. For example, in order to reduce signaling overhead, CPE can only report the beam with the largest RSRP value among the measured CSI-RS, which is used to determine the narrow beam pair for establishing communication with the base station. At this time, it only needs to report its CRI. Alternatively, CPE can report the CRIs and power values corresponding to the M beams with the largest RSRP values among the measured CSI-RS, in which the beam with the largest power value is used for communication with the base station, and the other M-1 ones are used as a candidate beam to cope with the beam recovery after the signal transmission quality deteriorates due to the slight change of the transmission environment. Alternatively, the reporting form of other M-1 measured power values can be the absolute values of the power, or the difference between the power values and the maximum value, so as to reduce the influence of quantization error when reporting the power values.

[0164] Through the above methods, CPE can complete the measurement of CSI-RS in the process of random access, quickly obtain the narrow beam pair for communication with the base station, and reduce the signaling overhead and the latency from access to using the narrow beam to improve transmission efficiency. At the same time, the information of the narrow beam for communication with the CPE determined by the base station through msg3 can be transmitted to the upper layer as soon as possible and configured, thus reducing the latency required for the upper layer configuration. In some cases, the base station can use the narrow beam obtained by measurement to transmit information for msg4, which improves the data transmission efficiency.

[0165] FIG. 7 illustrates a schematic diagram of CPE interacting with a base station. Next, the above process will be illustrated by an example embodiment shown in FIG. 7 below.

[0166] As shown in FIG. 7, in the initial access stage, the interaction process between CPE and the base station may include the following steps:

[0167] In step 701：CPE transmits a message 1(MSG1) and a CSI-RS measurement request to a base station (gNB, for example), the CSI-RS measurement request can be transmitted through the message 1 or separately from the message 1;

[0168] In response to the CSI-RS measurement request transmitted by CPE, in step 702, the base station transmits message 2(MSG2) and CSI-RS configuration information to CPE, the CSI-RS configuration information can be transmitted through message 2 or separately from message 2;

[0169] Based on the CSI-RS configuration information, in step 703, the base station transmits CSI-RS, such as aperiodic CSI-RS, to the CPE;

[0170] CPE measures CSI-RS on corresponding resources (e.g., time and / or frequency resources) based on the CSI-RS configuration information, and transmits message 3(MSG3) and CSI-RS measurement result to the base station in step 704, the CSI-RS measurement result can be transmitted through message 3 or separately from message 3;

[0171] Based on the CSI-RS measurement result transmitted by CPE, the base station can determine the narrow beam for communication with CPE,

[0172] After the CPE successfully accesses the base station, the CPE and the base station can transmit data through the determined narrow beam.

[0173] Optionally, in step 705, the base station may transmit message 4(MSG4) to the CPE through the determined narrow beam.

[0174] CPE actively requests the base station to configure aperiodic CSI-RS measurement, which can achieve parallelly performing the process of CSI-RS measurement and reporting during random access procedure by CPE, and quickly obtaining a high-gain narrow beam for communication with the base station. During the initial access process, CPE obtains the beam with the received power value meeting the transmission condition (RSRP > threshold) by receiving the periodic SSBs transmitted by the base station, then it is considered that the transmit beam corresponding to the SSB and the receive beam used by CPE when receiving the SSB constitute a wide beam pair for initial access for communication between CPE and the base station. CPE initiates random access procedure according to the information carried and indicated in SSB transmitted by the base station. CPE carries CSI-RS measurement request information in msg1 transmitted to the base station, for example, by using RO resources dedicated to CPE to transmit preamble. After transmitting msg1, CPE attempts to receive the random access response information (msg2) transmitted by the base station on the same time-frequency resources as msg1, and obtains the CSI-RS related configuration information required for CSI-RS measurement corresponding to the CSI-RS measurement request information transmitted by CPE in msg2. According to the obtained CSI-RS related configuration information, CPE performs CSI-RS measurement on the specified time-frequency resource location after time T1 from receiving of msg2 and according to the resource related information in the CSI-RS related configuration information. Thereinto, the measured content by the CPE is the reference signal power values (RSRP) at different time-frequency resource locations of CSI-RS. CPE reports the measurement result to the base station in msg3 according to related information of measurement result reporting in CSI-RS related configuration information, for example, CPE reports CSI-RS identification information (CRI) corresponding to the time-frequency resource with the largest measured power. According to the measurement result reported by CPE, the base station can determine the narrow beam for communication with CPE, and the base station can use the determined narrow beam when transmitting msg4. Accordingly, CPE can receive the information transmitted by the base station using the narrow beam determined by the measurement result (for example, CSI-RS identification information) reported in msg3.

[0175] Considering the issue of contention of different CPEs, a CPE can successfully access the base station only when it successfully receives msg4 transmitted by the base station and the identity information contained in msg4 is consistent with the identity information of the CPE. If the CPE suffers a contention failure in the connection with the base station for the first time, that is, it can successfully receive the msg4 transmitted by the base station, but the identity information included in the received msg4 is inconsistent with the identity information of the CPE, the CPE needs to switch the preamble and retransmit the msg1. During the new round of access, CPE can continue to request CSI-RS measurement to cope with the change of measurement results caused by the change of transmission environment. This method only needs to configure a specific preamble or RO resource for CSI-RS request, which has small restrictions on other terminals and will not significantly reduce the possibility of successful contention for other terminals.

[0176] Optionally, if msg1 transmitted by CPE contains CSI-RS request information every time, the signaling overhead required for CSI-RS measurement will increase and the latency will increase. Therefore, CPE can be configured not to carry CSI-RS request information when transmitting msg1 for the second time, that is, only one CSI-RS measurement is completed during the successful access of CPE to the base station. For example, CPE can use a non-CPE-specific preamble and / or transmit a preamble on a non-CPE-specific RO when transmitting a preamble in the second round, or can use a CPE-specific preamble dedicated for not requesting CSI-RS measurement, or can transmit a preamble on a CPE-specific RO dedicated for not requesting CSI-RS measurement, and the base station does not need to configure CSI-RS measurement when receiving such preamble transmitted by CPE or the preamble transmitted on such RO. Alternatively, CPE adjusts the CSI-RS measurement request information carried in msg1 from "1" (indicating that CSI-RS measurement is requested) to "0" (indicating that CSI-RS measurement is not requested or has been completed).

[0177] Optionally, when the base station receives msg1 with CSI-RS measurement request transmitted by CPE, it can first judge whether the CPE has completed the CSI-RS measurement process, so as to avoid the time and signaling overhead caused by multiple repeated measurements. FIG. 8 illustrates an example flowchart of a method performed by CPE. For example, in the embodiment shown in FIG. 8 below, CPE can choose whether to request the base station to configure CSI-RS measurement by using different preambles. As shown in FIG. 8, at first, in 801, CPE determines the RO time-frequency resources used to transmit msg1 according to SSB selected during initial access, and in step 802, it determines whether it needs to request the base station to configure CSI-RS measurement. If it is determined that it is not necessary to request the base station to configure CSI-RS measurement, in step 804, determine to transmit msg1 using a preamble other than those used to request on-demand SIB-CPE. If it is determined in step 802 that it needs to request the base station to configure CSI-RS measurement, in step 805, determine to transmit msg1 using the on-demand SIB-CPE dedicated preamble carried and / or indicated in the system information of SSB, to request the base station to transmit the particular content of SIB-CPE through PDSCH; in step 806, CPE transmits Message 1(msg1) using the determined preamble. In an implementation, in case that it is determined to request CSI-RS measurement in step 802, the method may further include determining whether CPE has completed CSI-RS measurement in step 803. If so, the method proceeds to step 804: determine to transmit msg1 using a preamble other than that used to request on-demand SIB-CPE, otherwise, it proceeds to step 805: determine to transmit msg1 using on-demand SIB-CPE dedicated preamble carried and / or indicated in the system information of SSB. For example, in the current round of random access, if the identity information contained in msg4 received by CPE is inconsistent with that of CPE, that is, contention of CPE is not successful, CPE can use other preamble other than on-demand SIB-CPE to transmit msg1 when switching preamble in the next round, so as to prevent requesting and configuring of SIB-CPE and CSI-RS measurement repeatedly during multiple rounds of access procedure with contention, shorten the connection time and reduce the signaling overhead.

[0178] Embodiment 2

[0179] When CPE knows that its terminal type is CPE, it may transmit CSI-RS measurement request information to the base station during random access procedure, requesting the base station to configure resources for CSI-RS measurement and / or measurement result reporting for the CPE and transmit related configuration information for CSI-RS measurement resources and reporting of measurement result to CPE. Based on such method, CPE can complete beam management based on CSI-RS measurement during random access procedure, obtain the high-gain narrow beam pair for communication between base station and CPE, shorten the time for CPE to obtain beams for high-gain data transmission, and improve the information transmission rate.

[0180] In this embodiment, the "CSI-RS measurement request information" may be transmitted in msg3 during random access procedure. Such method does not need to limit the preamble and / or RO resources used when transmitting msg1, the preambles and / or RO resources available for other terminals (an normal UE and / or CPE that does not use dedicated resources) increase, which reduces the probability of contention failure and reduces the impact on other terminals. The form of CSI-RS measurement request information may be explicit indication information. For example, the CSI-RS measurement request information may be 1-bit indication information, where "0" means that CSI-RS measurement is not requested, and "1" means that CSI-RS measurement is requested. According to the CSI-RS measurement request information contained in the received msg3, the base station determines whether it needs to transmit CSI-RS related configuration information in the subsequent signaling of random access, transmits CSI-RS based on the configuration information, receives the measurement result of CSI-RS, and adjusts the beam for communication with CPE based on the measurement result.

[0181] Optionally, the CSI-RS measurement request information transmitted by the CPE to the base station may be expressed in an implicit form. For example, the CSI-RS measurement request information transmitted by the CPE may be represented by multiple bits, for example, using an N-bit number or field (for example, CSI-RS request-CPE), where the value of N may be obtained through configuring by the other node (for example, through RRC). For example, when all the digits in the CSI-RS measurement request information (the aforementioned N-bit information) received by the base station are 0, it means that the CPE does not request CSI-RS measurement, and the base station does not need to configure resources and information related to CSI-RS measurement; when all digits in the CSI-RS measurement request information received by the base station are 1, it means that the CPE requests CSI-RS measurement, and the base station needs to configure resources and information related to CSI-RS measurement; when the CSI-RS measurement request information received by the base station is other values than all 0s and all 1s, the base station may perform other behaviors related to beam management according to the pre-agreed meaning of this information, for example, such information is used to determine whether CSI-RS measurement has been configured in the current round of access, and the specific content of CSI-RS measurement related information configured by the base station. Various schemes described in the present embodiment in combination with N-bit information may also be similarly applied to the case where multiple bits transmitted by message 1 request CSI-RS measurement in Embodiment 1.

[0182] Optionally, the values other than all 0s and all 1s of the CSI-RS measurement request information may also be used to indicate other information. For example, in the example in Table 1 below, the CSI-RS request-CPE is represented by a numerical value of 3 bits (N=3), 000 means that it is not necessary to configure CSI-RS measurement for CPE, 111 means that it is necessary for the base station to configure CSI-RS measurement for CPE, and other numerical values from 001 to 110 are agreed in advance for other behaviors related to beam management, such as CSI-RS index corresponding to the narrow beam recommended by CPE. The CSI-RS index may be a beam stored by CPE in advance, for example, a narrow beam used for communication with the base station previously, and the base station may reduce the number of beams of CSI-RS measurement according to this index (for example, a wide beam of SSB corresponds to 40 narrow beams, and the number of beams to measure may be reduced to 10 through this method), thus reducing the time and resources required for measurement. Alternatively, the CSI-RS index may be a narrow beam determined by CSI-RS measurement in the first round in the process of multiple rounds of contention by the CPE, and the base station may judge that the CPE has completed CSI-RS measurement after receiving this information, and reconfiguring of CSI-RS measurement is not needed, thus reducing the overhead of CSI-RS configuration signaling and the overhead of reporting of CSI-RS measurement results. Wherein, the number of bits N of the CSI-RS measurement request information is related to the number of narrow beams of CSI-RS contained in each SSB, and 2^N needs to be not less than the total number of narrow beams corresponding to each SSB.

[0183] CSI-RS request-CPEmeaning000No need to configure CSI-RS measurement001-110CRI corresponding to recommended narrow beam111Need to configure CSI-RS measurement

[0184] The base station receives the random access information msg3 transmitted by the terminal, and determines whether the msg3 includes CSI-RS measurement request information. If it is determined that the msg3 includes explicit and / or implicit CSI-RS measurement request information, the base station configures CSI-RS measurement for beam management. The base station may transmit CSI-RS related configuration information to the CPE, the configuration information includes at least one of related configuration information for CSI-RS measurement, related configuration information for measurement result reporting of CSI-RS, DCI trigger signaling for measurement and measurement result reporting of CSI-RS. For example, the CSI-RS related configuration information may include at least one of: the time-frequency location of CSI-RS measurement resources, the content of CSI-RS measurement, the resources for CSI-RS measurement result reporting, the content for CSI-RS measurement result reporting, whether to perform CSI-RS measurement, the time for CSI-RS measurement, and the time T2 for CSI-RS measurement result reporting. Wherein, the related configuration information for CSI-RS measurement includes at least one of: the type of CSI-RS resources (for example, periodic, semi-periodic, or aperiodic), resources of CSI-RS (NZP-CSI-RS, CSI-IM, CSI-SSB, ZP-CSI-RS), resource configuration information of CSI-RS (for example, density, start location in time domain and / or frequency domain, the number of antenna ports, the type of CDM multiplexing), bandwidth information (BWP), measurement content (RSRP, CRI, CQI, RI and PMI); the related configuration information for CSI-RS measurement result reporting includes at least one of: the type of measurement result reporting (periodic, semi-periodic or aperiodic) and the content of measurement result reporting (RSRP, CRI, CQI, RI and PMI); the DCI trigger signaling for measurement and measurement result reporting of CSI-RS includes at least one of: indication information (CSI request) of whether to perform CSI-RS measurement, time T1 (or called time offset T1) of CSI-RS measurement, and time T2 (or called time offset T2) of measurement result reporting of CSI-RS. All or part of the above information can be obtained from parameters configured by other nodes (for example, CSI-MeasConfig configured through RRC), or stored in the storage unit of CPE in advance. The CSI-RS related configuration information may be transmitted to CPE by the base station through msg4 during random access procedure. Because msg4 is transmitted on PDSCH, there is little restriction on the content of configuration signaling, and there is no need to transmit specific CSI-RS related configuration information by other means.

[0185] Because the relative position of the base station and CPE changes little, the type of resources in such CSI-RS related configuration information can be aperiodic CSI-RS (one-time CSI-RS measurement, the base station only transmits a group of signals for CSI-RS measurement), and correspondingly, the type of measurement result reporting can also be aperiodic CSI-RS measurement result reporting, so as to reduce signaling overhead and improve resource utilization.

[0186] Optionally, in order to prevent the waste of time and signaling overhead resulted from CPE failing to successfully receive a set of signals for CSI-RS measurement transmitted by the base station within the specified time, it can be configured that the type of resources in CSI-RS related configuration information can be semi-periodic CSI-RS. The base station transmits multiple sets of signals for CSI-RS measurement, with the corresponding configuration information the same. CPE only needs to measure and report the measurement result of the first set of CSI-RSs that can be received. Thereinto, for the number of repetitions of semi-periodic CSI-RS, the factors such as signaling overhead and the time when CPE receives the configuration signaling and the like can be comprehensively considered. The trigger signaling of CSI-RS can be transmitted in msg4.

[0187] Optionally, after CPE measures a set of CSI-RS, it may not continue to measure the CSI-RS subsequently transmitted by the base station; or, after receiving a set of CSI-RS measurement results, the base station may not parse other measurement results reported by the same CPE in the present round of random access procedure.

[0188] Optionally, in order to reduce the signaling overhead of the CSI-RS related configuration information, part of the CSI-RS related configuration information and signaling for random access can be combined, or simplified configuration signaling dedicated to aperiodic CSI-RS measurement (for example, CSI-MeasConfig-CPE) for beam management can be designed. Specifically, part of the CSI-RS related configuration information can be stored in CPE in advance, and the relevant contents are not needed to be carried in the configuration signaling transmitted by the base station. For example, the type of CSI-RS resource is aperiodic, the resource of CSI-RS is NZP-CSI-RS, the measurement content is RSRP, the type of measurement result reporting is aperiodic, and the content of measurement result reporting is RSRP and CRI. Then the CSI-RS related configuration information can be simplified to CSI-RS related configuration signaling dedicated to beam management of CPE, and only contains at least one of: resource configuration information of CSI-RS (for example, density, start location in time domain and / or frequency domain, the number of antenna ports, the type of CDM multiplexing), bandwidth information (BWP), time T1 of CSI-RS measurement, and time T2 of CSI-RS measurement result reporting.

[0189] Optionally, in order to further simplify the content of the CSI-RS related configuration information, some parameters in the configuration information can be fixed, such as the density, start location in time domain and / or frequency domain, the number of antenna ports, CDM multiplexing type and other contents in the resource configuration information of CSI-RS, and the fixed configuration information can be transmitted or stored in the storage module of CPE in advance.

[0190] Optionally, in some cases, one SSB only corresponds to a fixed set of CSI-RS related configuration information, the base station transmits a set (or group) containing a plurality of configuration information, and the content of the set corresponds to SSB index one by one, the CPE may determine the CSI-RS related configuration information used for CSI-RS measurement according to SSB identification information (SSB ID) obtained by initial access, and does not need to receive indication information of CSI-RS related configuration information separately. At this time, the CSI-RS related configuration information group, which is configured to the base station by the high layer at one time and contains multiple CSI-RS related configuration information, can serve multiple CPE located in different SSBs at the same time.

[0191] Optionally, multiple groups of CSI-RS related configuration information can be combined into a CSI-RS related configuration information set and transmitted to CPE or stored in a storage module of CPE in advance, or only the indication information of the CSI-RS related configuration information (for example, CSI-Measconfig index) can be transmitted in msg4. According to the indication information of CSI-RS related configuration information contained in msg4 transmitted from the base station, CPE can determine the CSI-RS resource configuration used for the current CSI-RS measurement and the configuration information for CSI-RS measurement result reporting, further reducing the signaling overhead for transmitting CSI-RS related configuration information.

[0192] Optionally, the indication information of CSI-RS related configuration information may be transmitted in the DCI configuring msg4. The DCI information is used to indicate to the terminal the time-frequency resource location information of msg4 in PDSCH.

[0193] Optionally, the specific contents of the multiple groups of CSI-RS-related configuration information set can be transmitted in system information (for example, through SIB-CPE). When there is no CPE access requirement, in order to avoid signaling overhead caused by continuous broadcasting of CPE-specific system information, the system information can be obtained in the form of non-broadcasting, and the terminal actively requests the base station to transmit detailed information on demand. That is, only indication information of SIB-CPE is carried in the broadcast SSB. According to the indication information in SSB, CPE requests the base station to transmit multiple groups of CSI-RS related configuration information contained in the specific SIB-CPE, and CPE can determine the CSI-RS related configuration information used in the current measurement according to the indication information of CSI-RS related configuration information transmitted by the base station. FIG. 9 illustrates a schematic diagram of interaction between a CPE and a base station. As shown in FIG. 9 below, the interaction between CPE and the base station includes the following steps:

[0194] Step 901：CPE transmits a message 3 and a SIB-CPE request to a base station (for example, gNB), wherein the SIB-CPE request is used to request the base station to transmit an SIB-CPE (including CSI-RS related configuration information set), and the SIB-CPE request may be transmitted through the message 3 or transmitted separately from the message 3;

[0195] Step 902: The base station transmits message 4 and indication information of CSI-RS related configuration information to CPE, the indication information may be transmitted through message 4 or separately from message 4;

[0196] In response to the SIB-CPE request, in step 903, the base station transmits the requested SIB-CPE information to the CPE. Step 903 may be performed before or after step 902, or may be performed substantially simultaneously with it.

[0197] According to an embodiment, the request for on-demand SIB-CPE information is transmitted in msg3 of random access procedure, that is, CPE carries the type of system information (SI) that needs to be read in MSG3, and when the base station receives the request information transmitted by CPE, it transmits detailed SIB-CPE information including CSI-RS related configuration information set requested by CPE. Based on the received two pieces of information, CPE determines a CSI-RS related configuration information set containing multiple CSI-RS related configuration information, and determines the CSI-RS related configuration used in the current CSI-RS measurement according to the indication information of CSI-RS related configuration. Thereinto, the order of transmitting msg4 and SIB-CPE is not limited, and the requested SIB-CPE information may be transmitted before or after msg4.

[0198] CPE successfully receives msg4 and obtains CSI-RS related configuration information contained and / or indicated in the information of msg4, so as to determine the time, resources, type and other information of measurement and / or measurement result reporting of CSI-RS. The base station transmits CSI-RS resources for measurement after the corresponding time after transmitting msg4. CPE measures CSI-RS on the time-frequency resource location indicated by the base station after the time T1 from receiving msg4 according to the obtained CSI-RS configuration information and obtains the measurement result. The measurement results include one or more measured reference signal power values (RSRP) of CSI-RS and corresponding CSI-RS indicator information (CSI-RS index, CRI). The time T1 when CPE receives and measures CSI-RS transmitted by the base station may be transmitted in msg4 or stored in the base station and CPE as a fixed value in advance. The time T1 (or called time offset T1) when the CPE performs CSI-RS measurement and configured by the base station may be calculated from the time when the base station transmits msg2, or it may be calculated from the time when the requested SIB-CPE transmitted by the base station is received. The value of time T1 is related to the factors such as signal transmission distance between the base station and CPE, the time for signal reception and data analysis by CPE, and the like.

[0199] CPE reports the measurement result according to the obtained CSI-RS measurement result and the related configuration information for CSI-RS measurement result reporting in the CSI-RS related configuration information transmitted by the base station. The measurement result of CSI-RS is transmitted in the uplink channel of CPE, for example, in PUSCH and / or PUCCH. In this embodiment, after receiving msg4, CPE may perform CSI-RS measurement according to the configuration information carried and / or indicated by msg4 and transmit the measurement result to the base station. The content of the measurement result of CSI-RS includes at least one of: identification information (CRI) of CSI-RS and measured power value, and the number of CSI-RS included in the measurement result may be one or more. For example, CPE may report the CRI and power values corresponding to the M beams with the largest RSRP value in the measured CSI-RS, in which the beam with the largest power value is used for communication with the base station, and the other M-1 ones are used as candidate beams to cope with the beam recovery after the signal transmission quality becomes worse due to the change of the transmission environment.

[0200] Optionally, the report form of power in CSI-RS measurement results may include the absolute value of the maximum power of RSRP, and the other M-1 measured power values may be the absolute value of their power, or the difference between the power values and the maximum value, so as to reduce the influence of quantization error when reporting power values.

[0201] Optionally, in order to reduce the signaling overhead, CPE may only report the beam with the largest RSRP value in the measured CSI-RS, the narrow beam pair for establishing communication with the base station. For example, CPE may report the CSI-RS beam identification information CRI with the largest power value and the corresponding RSRP value, or only report the CSI-RS beam identification information CRI with the largest power value.

[0202] For example, the information for CSI-RS measurement result reporting may be transmitted to the base station in PUCCH together with the ACK information fed back by CPE after successful random access, and the uplink information constitutes Msg5 in random access procedure. Based on such method, CPE reports the measurement results of CSI-RS only once when it successfully accesses the base station, which avoids the signaling overhead caused by repeated measurement result reporting in the process of multiple rounds of contention. At this time, the base station does not need to additionally inform CPE of the time T2 of CSI-RS measurement result reporting, and the signaling overhead is reduced. At the same time, the base station does not need to reserve resources for reporting the measurement results in each round of random access, and the related DCI resource trigger signaling for reporting the measurement results does not need to be transmitted additionally.

[0203] Optionally, in order to reduce the signaling overhead burden of such msg5 on PUCCH, it may be configured to report only the CRI corresponding to the beam with the largest measured RSRP value when reporting CSI-RS measurement results.

[0204] FIG. 10 illustrates a schematic diagram of CPE interacting with a base station. Next, through an example embodiment given in FIG. 10 below, the process associated with the method of reporting CSI-RS measurement results based on msg5 is illustrated.

[0205] As shown in FIG. 10, in the initial access process, in step 1001, CPE transmits message 1 (MSG1) to a base station (for example, gNB); in step 1002, the base station transmits Msg2 to CPE; in step 1003, CPE transmits Msg3 and CSI-RS measurement request to the base station, the CSI-RS measurement request may be transmitted through msg3 or transmitted separately from msg3; in step 1004, the base station transmits msg4 and CSI-RS related configuration information to CPE; in step 1004, based on the CSI-RS configuration information, the base station transmits CSI-RS (for example, aperiodic CSI-RS) to CPE on corresponding resources (for example, time and / or frequency resources); CPE measures CSI-RS based on the received CSI-RS related configuration information, and transmits msg5 in step 1006, the msg5 may carry the positive acknowledgement (ACK) information of message 4 and the CSI-RS measurement result.

[0206] Through the obtained CSI-RS measurement results, the base station may perform beam management to obtain a narrow beam for communication with CPE. After completing the random access, the base station and CPE may use the determined narrow beam for data transmission.

[0207] In an embodiment, CPE actively transmits aperiodic CSI-RS measurement request information to the base station through msg3, and attempts to receive msg4 transmitted by the base station, wherein msg4 carries CSI-RS related configuration information determined and / or transmitted by the base station according to the received CSI-RS request information. After CPE successfully receives msg4 and successfully parses to obtain CSI-RS related configuration information, it performs CSI-RS measurement at the specified time-frequency resource location after time T1 from receiving msg4 according to the CSI-RS related configuration information transmitted by the base station. Thereinto, measurement content by CPE is the reference signal power values (RSRP) at different CSI-RS time-frequency resource locations. CPE reports the measurement result to the base station according to related information on measurement result reporting in the CSI-RS related configuration information. For example, CPE reports CSI-RS identification information (CRI) corresponding to the time-frequency resource with the largest measured power. If the identity information contained in msg4 received by CPE is consistent with the identity information of CPE, that is, the contention of the CPE is successful, CPE reports the ACK information of successful access and CSI-RS measurement result to the base station through PUCCH; if the identity information contained in the msg4 received by the CPE is inconsistent with the identity information of the CPE, that is, the contention of the CPE is not successful, the CPE re-performs the process of msg1-msg4 until the contention succeeds or the number of rounds of performing msg1-msg4 reaches the maximum value (for example, 10 rounds, which is configured by the upper layer). Based on such method, CPE completes CSI-RS measurement for beam management at the same time during the process of random access, and the high-gain narrow beam obtained by CSI-RS measurement may be directly used in the subsequent data transmission, which increases the transmission efficiency.

[0208] Optionally, the CSI-RS measurement result may also be transmitted in PUSCH. The base station may transmit third information (e.g., the contents of DCI information, such as DCI 0_0 and DCI 0_1) to indicate the resources for reporting the measurement result, scheduling resources for reporting of CSI-RS measurement result, such as PUSCH resources. The third information may be transmitted with msg4 to reduce the overhead of signaling transmission. Using PUSCH to transmit the measurement result of CSI-RS, more detailed data of measurement result may be transmitted, including one or more measured power values (RSRP) of CSI-RS and the corresponding identification information (CRI). Such large amount of reported data may be used for more accurate beam selection and beam recovery at the base station.

[0209] Alternatively, in an implementation, DCI information for scheduling resources for CSI-RS measurement result reporting by the base station may be transmitted after the base station receives the ACK information of successful random access. FIGs. 11A and 11B illustrates a schematic diagram of CPE interacting with a base station. As shown in FIG. 11A, CPE successfully accesses the base station after receiving msg4 consistent with its identity information, and transmits ACK information of successful access to the base station in step 1101. According to the received ACK information, the base station schedules resources for CPE to report CSI-RS measurement result and transmits DCI information for scheduling the resources in step 1102. According to the information contained in the received DCI, CPE reports the measurement result at the specified time and on the specified PUSCH resource in step 1103. This method only schedules the resources for reporting the measurement result after the successful access of CPE, so as to avoid the waste of the resources for reporting the measurement result scheduled by the base station due to the unsuccessful contention of CPE.

[0210] Optionally, the uplink resource for reporting may be a resource associated with an ACK. For example, after a certain time offset after the ACK, there will be designated uplink resources used to transmit the measurement result. Based on such a method, the base station may reduce the signaling overhead of DCI.

[0211] Optionally, the terminal may report the measurement results of at least one other beam except the selected beam in the uplink resource. The results are used to determine a candidate beam for beam recovery.

[0212] As shown in FIG. 11B, after receiving msg4 consistent with its identity information, CPE successfully accesses the base station, sends the ACK information of successful access to the base station, and reports the measurement results through PUSCH resources after a certain time offset (the offset shown in FIG. 11B). This method uses the resources associated with the transmission of ACK to report the measurement results after the successful access of CPE, without the need for the base station to schedule special uplink resources for reporting the measurement results, which may save signaling overhead.

[0213] Through the method, CPE may complete the measurement of CSI-RS during the process of random access, quickly obtain the narrow beam pair for communication with the base station, and reduce signaling overhead and latency of fast data transmission. The base station directly transmits the details of CSI-RS related configuration information through msg4, which reduces the restrictions on RO resources and / or preambles used by CPE, makes the design more flexible, reduces the probability of collision with other CPE, and shortens the time for access to the base station.

[0214] Considering the contention of different CPEs, a CPE may successfully access to the base station only when it successfully receives msg4 transmitted by the base station and the identity information contained in msg4 is consistent with the identity information of CPE. If CPE suffers a contention failure in the connection with the base station for the first time, for example, it may successfully receive msg4 transmitted by the base station but the identity information included in msg4 is inconsistent with the identity information of the CPE, CPE may switch the preamble and retransmit msg1. In the process of a new round of access, CPE may continue requesting CSI-RS measurement to cope with the change of measurement result caused by the change of transmission environment.

[0215] Optionally, if msg3 transmitted by CPE contains CSI-RS request information every time, the signaling overhead required for CSI-RS measurement will increase and the latency will increase. Therefore, CPE may be configured not to carry CSI-RS request information when transmitting msg3 for the second time, and the corresponding msg4 does not need to carry CSI-RS measurement related information, and only completes CSI-RS measurement for one time during the process in which the CPE successfully accesses the base station. For example, in the second round of random access procedure, CPE adjusts the CSI-RS measurement request information carried in msg3 from "1" (indicating that CSI-RS measurement is requested) to "0" (indicating that CSI-RS measurement is not requested or has been completed).

[0216] Optionally, when the CSI-RS measurement request information is a multi-bit numerical value, other numerical values than all 0s and all 1s may be used to represent the CSI-RS identification information (CRI). Wherein the beam associated with the CSI-RS identification information may be the beam corresponding to the maximum RSRP value obtained from the latest CSI-RS measurement. This method may be used to report the measurement result of CSI-RS. When CPE suffers a contention failure in the first round of random access procedure, CPE may report the measurement result of CSI-RS of the first round in the CSI-RS measurement request in the msg3 of the second round of random access. When the CSI-RS measurement request received by the base station is other values than all 0s and all 1s, it may judge that the CPE has completed the CSI-RS measurement, and reconfiguring of the CSI-RS measurement is not needed, and the value in the CSI-RS measurement request information is the CSI-RS measurement result reported by the CPE. Based on this method, the waste of resources related to repeated CSI-RS measurement caused by contention failure is avoided, and the overhead for reporting CSI-RS measurement result and scheduling the resources for reporting measurement result is reduced. The beam corresponding to this CRI may be directly used to communicate with CPE during msg4, which improves the communication rate.

[0217] Optionally, if the CSI-RS measurement request information is a multi-bit value, the value of a certain bit may be defined for the base station to distinguish the meanings of other values except all 0s and all 1s. For example, the first bit being "0" may be used to indicate that CPE has completed CSI-RS measurement in the current random access, and the values other than the first bit in other numeral values than all 0s and all 1s indicate the identification information of CSI-RS (CRI) determined by CSI-RS measurement; the first bit being "1" may be used to indicate that this CPE has not performed CSI-RS measurement, and the values other than the first bit in other numeral values than all 0s and all 1s indicate the CRI corresponding to the narrow beam recommended by CPE based on the stored information.

[0218] FIG. 12 illustrates a schematic diagram of CPE interacting with a base station. Based on the above method, the related flow is illustrated with reference to FIG. 12. In the initial random access, CPE transmits msg1 to the base station in step 1201, receives msg2 from the base station in step 1202, transmits CSI-RS measurement request 1 through msg3 in step 1203 (for example, the request signaling is 111), receives msg4 including CSI-RS related configuration information from the base station in step 1204, and in step 1205, the base station transmits CSI-RS according to CSI-RS related configuration information, and the CPE performs CSI-RS measurement according to CSI-RS related configuration information transmitted by the base station. However, the identity information in msg4 received by CPE in step 1204 is inconsistent with the identity information of CPE, and the contention fails, so CPE does not need to report the CSI-RS measurement result and the ACK information of successful access (msg5). Subsequently, CPE reselects a preamble and re-performs the process of msg1-msg4 in steps 1206 to 1209, wherein msg3 transmitted in step 1208 contains CSI-RS measurement request 2 (for example, the request signaling is 101) instead of CSI-RS measurement request 1, and the changed CSI-RS measurement request 2 represents or includes the beam identity information (for example, CRI) corresponding to the maximum RSRP value obtained by CSI-RS measurement. When the base station receives this changed CSI-RS measurement request 2, it does not configure CSI-RS measurement, and determines a narrow beam for subsequent data transmission with the CPE according to the beam corresponding to the received CSI-RS measurement request 2 (for example, the measurement result indicated by multiple bits in the CSI-RS measurement request 2). When transmitting msg4 in step 1209, the base station may use the narrow beam to transmit data to CPE, thus improving the data transmission efficiency. If CPE may contention successfully in the msg4 received this round, it only needs to transmit ACK information to the base station in step 1210, thus reducing the signaling overhead. If the CPE suffers a contention failure in the msg4 received in this round, the related process of the second round of contention shown in the figure (CSI-RS measurement request 2 is included in msg3) may be repeated until the CPE succeeds in the contention or reaches the maximum number of repeated accesses.

[0219] Embodiment 3

[0220] In the two-step random access procedure, "CSI-RS measurement request information" for CPE to request to configure CSI-RS measurement, may be transmitted in msgA in random access procedure. Thereinto, msgA includes MsgA Preamble and msgA payload. If CSI-RS measurement request information is transmitted in msgA Preamble, its form is the same as that in Embodiment 1. If CSI-RS measurement request information is transmitted in msgA payload, its form is the same as that in Embodiment 2.

[0221] The base station receives the random access request msgA transmitted by CPE, and determines whether it needs to configure CSI-RS measurement for the terminal according to the information in msgA. For example, if msgA contains explicit and / or implicit CSI-RS measurement request information, the base station determines whether it needs to transmit CSI-RS related configuration information to the CPE, and transmits CSI-RS related configuration information to the CPE. Thereinto, the CSI-RS related configuration information may be transmitted through msg B, and the transmitted content may be at least one group of CSI-RS related configuration information or indication information of CSI-RS related configuration information, which may be transmitted in the PDSCH of msgB and / or the PDCCH indicating PDSCH in the same way as the methods in Embodiment 1 or 2 mentioned above. For the specific process, the description in the above Embodiment 1 or 2 may be referenced. In order to avoid redundancy, it will not be repeated here.

[0222] Embodiment 4

[0223] In some communication systems, both the methods described in Embodiment 1 and Embodiment 2 may be supported. For example, CPE may determine which method to use according to the configuration information from the base station.

[0224] Among them, the measurement based on the measurement request sent by msg1 described in Embodiment 1 is applicable to systems with a small number of connected terminals. In such systems, part of PRACH resources are allocated to CPE for indicating its terminal type and / or measurement request. By this method, the terminal may start to use the narrow beam for data transmission in msg4, which is suitable for services with high transmission delay requirements.

[0225] Among them, the measurement based on the measurement request sent by msg3 described in Embodiment 2 is applicable to systems with a large number of connected terminals. In such systems, more PRACH resources may be used to send random access requests, and the probability of contention failure is reduced. By this method, the possibility of contention failure of the terminal due to the limitation of random access resources may be reduced, and the access speed to the base station is fast.

[0226] CPE may determine which method is selected to perform random access based on configuration information from the base station. Wherein, the configuration information from the base station may be determined by the information contained and / or indicated by the SSB sent by the base station. For example, determined by the broadcast system information (SIB2).

[0227] The configuration information sent by the base station may contain implicit or explicit indication information for CPE to determine which method to choose to perform random access. FIG. 15 shows a schematic diagram of a terminal (for example, CPE) determining which method (for example, the method described in Embodiment 1, which is called Option 1 or option 1; or the method described in Embodiment 2, which is called option2 or Option 2) to use for performing random access according to configuration information. As shown in FIG. 15, in step 1501, CPE receives system information (SI), and in step 1502, CPE determines whether the early beam measurement request is supported based on the indication information in SI. For example, CPE receives the configuration information from a base station and determines whether the base station supports narrow beam measurement in random access procedure. If the base station is a legacy base station, the determination result in step 1502 may be not supported, and the indication information will indicate that the base station does not support the narrow beam measurement in random access procedure. In this case, the CPE may perform step 1504: the CPE performs random access without beam measurement request. If the base station supports configuring narrow beam measurement in random access procedure, the determination result of step 1502 may be yes, and CPE may perform step 1503：CPE determines the option for the early beam measurement request based on the option indication information or PRACH resource allocation information in SI. For example, CPE may determine whether to select the method described in Embodiment 1 (option1) or the method described in Embodiment 2 (option2) to perform random access according to the explicit indication information or implicit indication information from the base station.

[0228] The explicit indication method may be an explicit parameter in the configuration information, such as: early beam measurement request option = {option1, option2}, or other information for indicating option1, option2, such as "0" indicating option1, "1" indicating option2, and so on. Implicit indication method may be random access resource allocation information from the base station. For example, if the system information contains CPE-specific random access resource information (RO, preamble), such information implicitly indicates that the method configured by the base station is option1. Similarly, if no CPE-specific random access resource configuration information exists, the terminal uses the method shown in option2 to send a measurement request and perform measurement and other related processes.

[0229] Embodiment 5

[0230] In some embodiments, in order to reduce the time delay caused by the related process of the introduced narrow beam measurement, a two-step measurement result reporting method is designed.

[0231] When configuring narrow beam measurement, the base station may determine the period and number of CSI-RSs to be sent for measurement according to the time difference (offset) of transmissions between two random access signalings (for example, msg2 and msg3, etc.) in a random access attempt, so that the terminal may complete the measurement before the next signaling transmission. The configuration signaling is sent to CPE through related signaling of initial access, such as resource configuration parameters in UL grant.

[0232] However, considering the different capabilities of different CPEs and / or the difference in time required for different data processing by the terminal, the terminal may only complete the data processing of part of the CSI-RS measurement results when sending the next random access signaling (for example, msg3).

[0233] In order to ensure that the terminal may obtain the measurement results of narrow beams and apply them to the transmission process as soon as possible, without changing the existing transmission timeline of random access signalings, only part of the processed measurement results may be reported in a random access signaling, and the remaining measurement results or the complete measurement results including all beams may be reported in the subsequent data transmission process, for higher beam gain and transmission efficiency.

[0234] In an implementation, the reported partial measurement results need to meet a certain condition. For example, if a beam whose reference signal received power value (such as RSRP or RSRQ) is larger than a specified threshold, or larger than or equal to the specified threshold, among the part of processed measurement results exists. For example, if the maximum value of the reference signal received power value in the part of processed measurement results is larger than a specified threshold, the beam information (for example, CSI-RS resource index) corresponding to the maximum reference signal received power value is reported. The threshold may be obtained through the configuration signaling from the base station, for example, obtained in the system information sent by the base station (for example, obtained through the SIB-CPE). The threshold corresponds to the conditional threshold for a narrow beam that may be used as msg4, for example, if the measured value of this beam is larger than the threshold, it is considered that this beam may be used for msg4 transmission, although this beam is not necessarily the strongest beam among all the measured beams. If no beam with the maximum reference signal received power value (RSRP) larger than the specified threshold among the part of processed measurement results exists, information of not existing (for example, NA, or the agreed value in advance) is reported, or no measurement result is reported.

[0235] In an implementation, in the subsequent uplink signaling, the terminal reports the measurement results based on all beams. If a better beam (with larger received power value) in the measurement results of subsequent processing than the measurement results reported for the first time exists, the terminal will report the strongest beam (with the largest received power value) among all the beams; If no beam better than the first reported measurement result (the received power value is larger) exists in the subsequent processing of measurement results, the terminal will report the beam measurement result corresponding to the first reported measurement result. In this way, the terminal may report information related to all measurement results, for example, it may report the overall best measurement result. Alternatively, the terminal may also report partial measurement results of the measurement for the first time and report the remaining measurement results for the second time, so that the base station may obtain the measurement results of all the configured measurement beams or the information representing the measurement results of all the beams through the two reports of the terminal.

[0236] For different embodiments, the transmission channel and signaling where the partial measurement results are reported are different. FIG. 16 takes the Embodiment 1 as an example to illustrate the transmission channel and / or transmission signaling where the two-step measurement results are reported.

[0237] As shown in FIG. 16, in step 1601, CPE performs early narrow beam measurement; In step 1602, CPE sends a first report in msg3. The first report is, for example, a report related to partial measurement results that CPE has finished processing before sending msg3. In step 1603, CPE determines whether the contention is successful; If the contention is successful, step 1604 is performed, CPE sends the second report in msg5, and in step 1606, CPE reports the candidate beam report. If the determination result in step 1603 is that the contention failed, then step 1605 is performed, CPE sends the second report in the next round of msg3, and after sending the ACK in step 1607, step 1606 is performed. The second report is, for example, a report related to all the measurement results obtained by CPE performing early narrow beam measurement.

[0238] In an implementation, in the method of performing beam measurement after msg2 described in Embodiment 1, partial measurement results may be sent in msg3, and all the measurement results may be sent together with the ACK on the uplink PUCCH resource for successful random access.

[0239] Considering the contention-based random access procedure of the terminal, if the contention fails, the measurement results of all beams may be sent in msg3 in the second random access attempt after the contention fails. After the contention fails, the terminal will replace the preamble and resend the PRACH request. If the terminal does not continue to send the measurement request, the measurement result information of all beams reported by this terminal may also be used to indicate that the terminal type is CPE (for example, this may be regarded as an implicit indication). FIG. 17 shows a schematic diagram of a terminal performing two-step measurement result reporting according to an embodiment. As shown in FIG. 17, in an attempt of random access (for example, the first attempt shown in FIG. 17), the terminal sends a beam measurement request (the request shown in FIG. 17) together with msg1, and in the case of successful random access, the terminal sends a first report through msg3 and a second report together with ACK through msg5; When the random access fails in this attempt, the first report is sent through msg3 in this attempt, and the second report is sent through msg3 in the next attempt, and the beam measurement request will not be sent repeatedly when sending msg1 in the next attempt.

[0240] Similarly, in the method of performing beam measurement after msg4 as described in Embodiment 2, partial measurement results may be sent along with ACK on the uplink PUCCH resource for successful random access, and all beam measurement results may be sent on the PUSCH resource after PUCCH. For example, the base station configures uplink PUSCH resource through DCI after receiving PUCCH, or the PUSCH resource associated with the PUCCH resource is agreed in advance.

[0241] FIG. 18 shows a schematic diagram of the beams involved in the measurement results reported twice when the terminal succeeds in random access in one attempt. As shown in FIG. 18, considering the processing time of the measurement results at the terminal (for example, the CSI processing time shown in FIG. 18), the information related to the measurement results related to beam 1 to beam m will be reported in msg3 as the first CSI report, and the information related to the measurement results related to the remaining beams will be reported in ACK as the second CSI report.

[0242] Because the size of resources transmitted through PUSCH is not limited by the number of signaling bits for random access, the measurement results of candidate beams may also be transmitted through PUSCH. The information of the candidate beams may be used in the later beam recovery and / or beam maintenance process.

[0243] Although many aspects of the present disclosure have been exemplarily described in terms of "Embodiment 1", "Embodiment 5" above, it may be understood that these described solutions may be combined with each other.

[0244] In addition, it may be understood that CSI-RS is described in this disclosure as an example of a reference signal used for measurement for beam management, however, this is only an example, other reference signals may also be used, and methods such as measurement configuration or reporting and the like may also be used, all of which are within the scope of this disclosure. In addition, the method provided by the present disclosure may be used not only for the communication between the base station and CPE, but also for the communication between the base station and UE or between the base station and other types of terminals.

[0245] FIG. 13 illustrates a schematic structural diagram of a first device 1300 according to at least one embodiment of the present disclosure. The first device may be, for example, a CPE, a FWA-related device, or a user equipment (UE). Referring to FIG. 13, the first device 1300 includes a transceiver 1301 and a controller 1302. The transceiver 1301 is configured to transmit data or signals and receive data or signals. The controller 1302 is coupled with the transceiver 1301 and configured to perform control so that the first device 1300 performs the method according to the embodiment of the present disclosure. In an implementation, the first device 1300 may further include a memory (not shown) on which computer-executable instructions are stored. When the instructions are performed by the controller 1302, the first device 1300 may perform at least one method corresponding to the above-mentioned embodiments of the present disclosure.

[0246] FIG. 14 illustrates a schematic structural diagram of a network device (e.g., a base station) 1400 according to at least one embodiment of the present disclosure. Referring to FIG. 14, the network device 1400 includes a transceiver 1401 and a controller 1402. The transceiver 1401 is configured to transmit data or signals and receive data or signals. The controller 1402 is coupled with the transceiver 1401 and configured to perform control so that the network device 1400 performs the method according to the embodiment of the present disclosure. In an implementation, the network device 1400 may further include a memory (not shown) on which computer-executable instructions are stored. When the instructions are performed by the controller 1402, the network device 1400 may perform at least one method corresponding to the above embodiments of the present disclosure.

[0247] The above is only the preferred embodiment of the invention, and it is not used to limit the invention. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the invention should be included in the scope of protection of the invention.

[0248] Those skill in that art will understand that the present invention includes apparatus for perform one or more of the operations described in this application. These devices may be specially designed and manufactured for required purposes, or they may also include known devices in general-purpose computers. These devices have computer programs stored therein, which are selectively activated or reconfigured. Such a computer program may be stored in a device (e.g., a computer) readable medium including but not limited to any type of disk (including floppy disk, hard disk, optical disk, CD-ROM, and magneto-optical disk), ROM(Read-Only Memory, Read-only memory), RAM(Random Access Memory), EPROM (erasable programmable read-only memory), EEPROM (electrically erasable programmable read-only memory), flash memory, magnetic card or optical card. That is, a readable medium includes any medium in which information is stored or transmitted by a device (e.g., a computer) in a readable form.

[0249] It will be understood by those skilled in the art that each block in these structural diagrams and / or block diagrams and / or flow diagrams and combinations of blocks in these structural diagrams and / or block diagrams and / or flow diagrams may be implemented by computer program instructions. It may be understood by those skilled in the art that these computer program instructions may be provided to a general-purpose computer, a professional computer or a processor of other programmable data processing methods for implementation, so that the scheme specified in the block or blocks of the structure diagram and / or block diagram and / or flow diagram disclosed in the present invention may be performed by the processor of the computer or other programmable data processing methods.

[0250] Those skilled in the art may understand that the steps, measures and schemes in various operations, methods and processes discussed in the present invention may be alternated, modified, combined or deleted. Further, other steps, measures and schemes in the various operations, methods and processes already discussed in the present invention may also be alternated, changed, rearranged, decomposed, combined or deleted. Further, steps, measures and schemes in various operations, methods and flows disclosed in the present invention in the prior art may also be alternated, changed, rearranged, decomposed, combined or deleted.

[0251] What has been described above is only part of the implementation of the present invention. It should be pointed out that for those skilled in the art, several improvements and embellishments may be made without departing from the principles of the present invention, and these improvements and embellishments should also be regarded as the protection scope of the present invention.

Claims

1.A method performed by a customer premises equipment (CPE) in a communication system, the method comprising:transmitting, to a base station, a message 1 (Msg1) including channel state information reference signal (CSI-RS) measurement request information;receiving, from the base station, a message 2 (Msg2) including CSI-RS configuration information;based on the CSI-RS configuration information, measuring a CSI-RS; andtransmitting, to the base station, a message 3 (Msg3) including a measurement result of the CSI-RS.2.The method of claim 1, further comprising:receiving, from the base station, a message 4 (Msg4) through a narrow beam,wherein the narrow beam is determined based on the measurement result of the CSI-RS.3.The method of claim 1,wherein the CSI-RS measurement request information includes an indication, andwherein in case that CSI-RS measurement is requested, the indication is set to "1" and in case that CSI-RS measurement is not requested, the indication is set to "0".4.The method of claim 1,wherein the measurement result of the CSI-RS includes CSI-RS identification information (CRI) corresponding to a time-frequency resource with the largest measured power.5.A method performed by a base station in a communication system, the method comprising:receiving, from a customer premises equipment (CPE), a message 1 (Msg1) including channel state information reference signal (CSI-RS) measurement request information;transmitting, to the CPE, a message 2 (Msg2) including CSI-RS configuration information;transmitting, to the CPE, a CSI-RS; andreceiving, from the CPE, a message 3 (Msg3) including a result of the CSI-RS measurement.6.The method of claim 5, further comprising:based on the measurement result of the CSI-RS measurement, determining a narrow beam for the CPE; andtransmitting, to the CPE, a message 4 (Msg4) through the determined narrow beam.7.The method of claim 5,wherein the CSI-RS measurement request information includes an indication, andwherein in case that CSI-RS measurement is requested, the indication is set to "1" and in case that CSI-RS measurement is not requested, the indication is set to "0".8.The method of claim 5,wherein the measurement result of the CSI-RS includes CSI-RS identification information (CRI) corresponding to a time-frequency resource with the largest measured power.9.A customer premises equipment (CPE) in a communication system, the CPE comprising:at least one transceiver;at least one processor communicatively coupled to the at least one transceiver; andat least one memory, communicatively coupled to the at least one processor, storing instructions executable by the at least one processor individually or in any combination to cause the terminal to:transmit, to a base station, a message 1 (Msg1) including channel state information reference signal (CSI-RS) measurement request information,receive, from the base station, a message 2 (Msg2) including CSI-RS configuration information,based on the CSI-RS configuration information, measure a CSI-RS, andtransmit, to the base station, a message 3 (Msg3) including a measurement result of the CSI-RS.10.The CPE of claim 9, wherein the instructions executable by the at least one processor individually or in any combination further cause the CPE to:receive, from the base station, a message 4 (Msg4) through a narrow beam,wherein the narrow beam is determined based on the measurement result of the CSI-RS.11.The CPE of claim 9,wherein the CSI-RS measurement request information includes an indication, andwherein in case that CSI-RS measurement is requested, the indication is set to "1" and in case that CSI-RS measurement is not requested, the indication is set to "0".12.The CPE of claim 9,wherein the measurement result of the CSI-RS includes CSI-RS identification information (CRI) corresponding to a time-frequency resource with the largest measured power.13.A base station in a communication system, the base station comprising:at least one transceiver;at least one processor communicatively coupled to the at least one transceiver; andat least one memory, communicatively coupled to the at least one processor, storing instructions executable by the at least one processor individually or in any combination to cause the terminal to:receive, from a customer premises equipment (CPE), a message 1 (Msg1) including channel state information reference signal (CSI-RS) measurement request information,transmit, to the CPE, a message 2 (Msg2) including CSI-RS configuration information,transmit, to the CPE, a CSI-RS, andreceive, from the CPE, a message 3 (Msg3) including a result of the CSI-RS measurement.14.The base station of claim 13, wherein the instructions executable by the at least one processor individually or in any combination further cause the base station to:based on the measurement result of the CSI-RS measurement, determine a narrow beam for the CPE, andtransmit, to the CPE, a message 4 (Msg4) through the determined narrow beam.15.The base station of claim 13,wherein the CSI-RS measurement request information includes an indication,wherein in case that CSI-RS measurement is requested, the indication is set to "1" and in case that CSI-RS measurement is not requested, the indication is set to "0", andwherein the measurement result of the CSI-RS includes CSI-RS identification information (CRI) corresponding to a time-frequency resource with the largest measured power.

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