Method and device for accessing communication system

Abstract

The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. The present invention provides a method performed by a user equipment (UE) in a communication system, comprising: receiving first configuration information related to a first beam mode, wherein the first beam mode is related to multiple beams, the first configuration information including information indicating whether the first beam mode is enabled and information related to a downlink reference signal; in case the information indicating whether the first beam mode is enabled indicates enabled, receiving the downlink reference signal including multiple signals or sequences based on the first configuration information, obtaining first information related to a beam for signal transmission, based on the downlink reference signal; informing a base station of the first information.

Description

METHOD AND DEVICE FOR ACCESSING COMMUNICATION SYSTEM

[0001] The present invention relates to wireless communication, and more specifically, to a method and device for accessing communication system.

[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] In order to meet the increasing demand for wireless data communication services since the deployment of 4G communication systems, efforts have been made to develop improved 5G or pre-5G communication systems. Therefore, 5G or pre-5G communication systems are also called "Beyond 4G networks" or "Post-LTE systems".

[0009] In order to achieve a higher data rate, 5G communication systems are implemented in higher frequency (millimeter, mmWave) bands, e.g., 60 GHz bands. In order to reduce propagation loss of radio waves and increase a transmission distance, technologies such as beamforming, massive multiple-input multiple-output (MIMO), full-dimensional MIMO (FD-MIMO), array antenna, analog beamforming and large-scale antenna are discussed in 5G communication systems.

[0010] In addition, in 5G communication systems, developments of system network improvement are underway based on advanced small cell, cloud radio access network (RAN), ultra-dense network, device-to-device (D2D) communication, wireless backhaul, mobile network, cooperative communication, coordinated multi-points (CoMP), reception-end interference cancellation, etc.

[0011] In 5G systems, hybrid FSK and QAM modulation (FQAM) and sliding window superposition coding (SWSC) as advanced coding modulation (ACM), and filter bank multicarrier (FBMC), non-orthogonal multiple access (NOMA) and sparse code multiple access (SCMA) as advanced access technologies have been developed.

[0012] The technical problem is that initial access and beam alignment require sending and measuring separate reference signals on each beam one by one, resulting in high latency and excessive signaling / resource overhead.

[0013] According to an embodiment of the present disclosure, there is provided a method performed by a user equipment (UE) in a communication system, comprising:

[0014] receiving first configuration information related to a first beam mode, wherein the first beam mode is related to multiple beams, the first configuration information including information indicating whether the first beam mode is enabled and information related to a downlink reference signal;

[0015] in case the information indicating whether the first beam mode is enabled indicates enabled, receiving the downlink reference signal including multiple signals and / or sequences based on the first configuration information,

[0016] obtaining first information related to a beam for signal transmission, based on the downlink reference signal;

[0017] informing a base station of the first information,

[0018] wherein, the information related to a downlink reference signal includes at least one of: information related to the number of signals and / or sequences included in the downlink reference signal, information related to a gap between the multiple signals and / or sequences included in the downlink reference signal, and format information of the downlink reference signal.

[0019] In an implementation, the first configuration information further includes at least one of: a mapping relationship between received signal ratios associated with the downlink reference signal and angle deviation values, information related to boresight directions of multiple beams used to transmit the downlink reference signal, measurement window configuration information, information related to a type of the first information, information related to granularity of the first information, and resource configuration information for informing the first information.

[0020] In an implementation, the first information includes at least one of: a measured value of the downlink reference signal, a ratio of measured values of the multiple signals and / or sequences included in the downlink reference signal, an angle deviation value, information related to a desired beam.

[0021] In an implementation, the measured value is RSRP or RSRPP,

[0022] wherein, the RSRPP is associated with at least one of: the first path of the downlink reference signal in time domain, the first path with a power not less than a first threshold in time domain, and a path with the largest power in time domain.

[0023] In an implementation, the informing a base station of the first information, comprises:

[0024] transmitting a PRACH using a PRACH resource associated with the first information; or

[0025] transmitting the first information using an uplink resource for the first information, the uplink resource is preconfigured or obtained based on the first configuration information.

[0026] In an implementation, transmitting the first information comprises: transmitting the first information through at least one of: PUSCH of message 3 in random access, PUCCH transmitted after message 4 in random access, UCI on PUSCH, or a MAC CE.

[0027] In an implementation, the downlink reference signal is a synchronization signal physical broadcast channel block (SSB), the downlink reference signal includes one of: an SSB including multiple repetitions, a signal including multiple repetitions of an SSB.

[0028] In an implementation, the downlink reference signal includes DMRS, and the multiple signals included in the downlink reference signal include one of: multiple repetitions of a channel including the DMRS, multiple repetitions of a DMRS symbol included in the channel,

[0029] the multiple sequences included in the downlink reference signal include multiple repetitions of a DMRS sequence.

[0030] In an implementation, the multiple repetitions of a DMRS symbol included in the channel include N repetitions of DMRS symbol in the channel,

[0031] wherein K DMRS symbols of the N repetitions of DMRS symbol are located at K symbols at start location or end location of the channel in time domain, or the K DMRS symbols are located at K locations frequency division multiplexed at start location or end location of the channel in time domain, where K is smaller than N.

[0032] In an implementation, the channel includes at least one of PBCH, PDCCH, PDSCH.

[0033] In an implementation, the first configuration information is received through at least one of: PBCH, SIB1 PDCCH, SIB1 PDSCH, PDCCH of message 2 in random access, PDSCH of message 2 in random access.

[0034] In an implementation, the UE receives the downlink reference signal using a same beam or different beams.

[0035] According to an embodiment of the present disclosure, there is provided a method performed by a user equipment (UE) in a communication system, comprising:

[0036] receiving second configuration information related to a first beam mode, wherein the first beam mode is related to multiple beams;

[0037] transmitting an uplink reference signal using multiple beams on a resource for the first beam mode based on the second configuration information;

[0038] receiving second information related to a beam for signal transmission;

[0039] determining a beam for signal transmission based on the second information,

[0040] wherein the multiple beams include a first beam and at least one second beam associated with the first beam, and the second configuration information includes information related to the uplink reference signal.

[0041] In an implementation, beam coefficients of the second beam are derived based on beam coefficients of the first beam, or

[0042] a boresight direction of the second beam is derived based on a boresight direction of the first beam.

[0043] In an implementation, the first beam is a sum beam, and the second beam is a differential beam.

[0044] In an implementation, a boresight direction of the second beam has an offset angle with respect to a boresight direction of the first beam, the offset angle being preconfigured or predefined.

[0045] In an implementation, the multiple beams are transmitted with the same power, or

[0046] the transmit power associated with the second beam has a power offset from the transmit power associated with the first beam, the power offset being predefined, preconfigured, or associated with the first beam mode.

[0047] In an implementation, the information related to the uplink reference signal includes at least one of: information related to the number of signals and / or sequences included in the uplink reference signal, information related to a gap between the multiple signals and / or sequences included in the uplink reference signal, and format information of the uplink reference signal.

[0048] In an implementation, the signals and / or sequences included in the uplink reference signal include multiple repetitions of a signal and / or sequence, and a number N of the multiple repetitions of the signal and / or sequence obtained based on the first configuration information is smaller than a number N' of repetitions of the uplink reference signal configured for the UE,

[0049] wherein the method further comprises one of:

[0050] transmitting some or all of N'-N repetitions using the first beam;

[0051] transmitting some or all of the N'-N repetitions using the second beam;

[0052] not transmitting the N'-N repetitions.

[0053] In an implementation, the multiple signals and / or sequences include N repetitions of the uplink reference signal, the N repetitions corresponding to N transmission occasions of the uplink reference signal, and each transmission occasion includes M repetitions of a sequence of the uplink reference signal,

[0054] the uplink reference signals corresponding to the N transmission occasions are respectively transmitted using the first beam and the at least one second beam.

[0055] In an implementation, the multiple signals and / or sequences include multiple repetitions of a sequence of the uplink reference signal,

[0056] the first K1 repetitions of the multiple repetitions are transmitted using the first beam, and the remaining repetitions are transmitted using the at least one second beam.

[0057] In an implementation, the second information includes at least one of: a measured value of the uplink reference signal, a ratio of the measured value of the first beam to the measured value of the at least one second beam, an angle deviation value, information related to a desired beam.

[0058] In an implementation, the measured value is RSRP or RSRPP,

[0059] wherein, the RSRPP corresponds to one of: the first path of the uplink reference signal in time domain, the first path with a power not less than a first threshold in time domain, and a path with the largest power in time domain.

[0060] In an implementation, the method further comprises:

[0061] determining to enable the first beam mode if a first condition is met,

[0062] the first condition includes at least one of: indication information on enabling the first beam mode of the base station is received, the UE capability supporting the first beam mode, the number of uplink transmit beams supported by the UE is not less than a second threshold.

[0063] According to an embodiment of the present disclosure, there is provided a method performed by a network device in a communication system, comprising:

[0064] transmitting first configuration information related to a first beam mode, wherein the first beam mode is related to multiple beams;

[0065] transmit a downlink reference signal including multiple signals and / or sequences based on the first configuration information;

[0066] receiving, from a user equipment (UE), first information related to a beam for signal transmission;

[0067] wherein the first configuration information includes information related to the downlink reference signal.

[0068] In an implementation, the first configuration information further includes at least one of: a mapping relationship between received signal ratios associated with the downlink reference signal and angle deviation values, information related to boresight directions of multiple beams used to transmit the downlink reference signal, measurement window configuration information, information related to a type of the first information, information related to granularity of the first information, and resource configuration information for informing the first information.

[0069] In an implementation, the first information includes at least one of: a measured value of the downlink reference signal, a ratio of measured values of the multiple signals and / or sequences included in the downlink reference signal, an angle deviation value, information related to a desired beam.

[0070] In an implementation, the measured value is RSRP or RSRPP,

[0071] wherein, the RSRPP is associated with at least one of: the first path of the downlink reference signal in time domain, the first path with a power not less than a first threshold in time domain, and a path with the largest power in time domain.

[0072] In an implementation, the first information is received through at least one of: PUSCH of message 3 in random access, PUCCH transmitted after message 4 in random access, UCI on PUSCH, or a MAC CE.

[0073] In an implementation, the downlink reference signal is a synchronization signal physical broadcast channel block (SSB), the downlink reference signal includes one of: an SSB including multiple repetitions, a signal including multiple repetitions of an SSB.

[0074] In an implementation, the downlink reference signal includes DMRS, and the multiple signals included in the downlink reference signal include one of: multiple repetitions of a channel including the DMRS, multiple repetitions of a DMRS symbol included in the channel,

[0075] the multiple sequences included in the downlink reference signal include multiple repetitions of a DMRS sequence.

[0076] In an implementation, the multiple repetitions of a DMRS symbol included in the channel include N repetitions of DMRS symbol in the channel,

[0077] wherein K DMRS symbols of the N repetitions of DMRS symbol are located at K symbols at start location or end location of the channel in time domain, or the K DMRS symbols are located at K locations frequency division multiplexed at start location or end location of the channel in time domain, where K is smaller than N.

[0078] In an implementation, the channel includes at least one of PBCH, PDCCH, PDSCH.

[0079] In an implementation, the first configuration information is transmitted through at least one of: PBCH, SIB1 PDCCH, SIB1 PDSCH, PDCCH of message 2 in random access, PDSCH of message 2 in random access.

[0080] According to an embodiment of the present disclosure, there is provided a method performed by a network device in a communication system, comprising:

[0081] transmitting second configuration information related to a first beam mode, wherein the first beam mode is related to multiple beams;

[0082] receiving an uplink reference signal including multiple signals and / or sequences from a user equipment (UE);

[0083] transmitting, to the UE, second information related to a beam for signal transmission based on measurement of the uplink reference signal;

[0084] transmit and / or receive a signal using a beam based on the second information,

[0085] wherein the multiple beams include a first beam and at least one second beam associated with the first beam, and the second configuration information includes information related to the uplink reference signal.

[0086] In an implementation, beam coefficients of the second beam are derived based on beam coefficients of the first beam, or

[0087] a boresight direction of the second beam is derived based on a boresight direction of the first beam.

[0088] In an implementation, the first beam is a sum beam, and the second beam is a differential beam.

[0089] In an implementation, a boresight direction of the second beam has an offset angle with respect to a boresight direction of the first beam, the offset angle being preconfigured or predefined.

[0090] In an implementation, the information related to the uplink reference signal includes at least one of: information related to the number of signals and / or sequences included in the uplink reference signal, information related to a gap between the multiple signals and / or sequences included in the uplink reference signal, and format information of the uplink reference signal.

[0091] In an implementation, the signals and / or sequences included in the uplink reference signal include multiple repetitions of a signal and / or sequence, and a number N of the multiple repetitions of the signal and / or sequence obtained based on the first configuration information is smaller than a number N' of repetitions of the uplink reference signal configured for the UE.

[0092] In an implementation, the multiple signals and / or sequences include N repetitions of the uplink reference signal, the N repetitions corresponding to N transmission occasions of the uplink reference signal, and each transmission occasion includes M repetitions of a sequence of the uplink reference signal,

[0093] In an implementation, the second information includes at least one of: a measured value of the uplink reference signal, a ratio of the measured value of the first beam to the measured value of the at least one second beam, an angle deviation value, information related to a desired beam.

[0094] In an implementation, the measured value is RSRP or RSRPP,

[0095] wherein, the RSRPP corresponds to one of: the first path of the uplink reference signal in time domain, the first path with a power not less than a first threshold in time domain, and a path with the largest power in time domain.

[0096] According to an embodiment of the present disclosure, there is provided a user equipment (UE), comprising:

[0097] a transceiver configured to transmit and / or receive signals;

[0098] a controller configured to control the UE to perform a method according to an embodiment of the present disclosure.

[0099] According to an embodiment of the present disclosure, there is provided a network device, comprising:

[0100] a transceiver configured to transmit and / or receive signals;

[0101] a controller configured to control the network device to perform a method according to an embodiment of the present disclosure.

[0102] The disclosure provides a method enabling the UE and network to rapidly establish the optimal transmit / receive beam with reduced delay and overhead.

[0103] FIG. 1 illustrates an example wireless network according to various embodiments of the present disclosure;

[0104] FIG. 2a illustrates an example wireless transmit path according to the present disclosure;

[0105] FIG. 2b illustrates an example wireless receive path according to the present disclosure;

[0106] FIG. 3a illustrates an example user equipment according to the present disclosure;

[0107] FIG. 3b illustrates an example base station according to the present disclosure;

[0108] FIG. 4 illustrates a schematic diagram of a 4-step random access procedure;

[0109] FIG. 5 illustrates an example diagram of SSB repetition according to an embodiment of the present disclosure;

[0110] FIG. 6 illustrates an example diagram of SSB repetition in frequency domain according to an embodiment of the present disclosure;

[0111] FIG. 7 illustrates an example diagram of PSS repetition according to an embodiment of the present disclosure;

[0112] FIG. 8 illustrates an example diagram of SSB repetition in frequency domain according to an embodiment of the present disclosure;

[0113] FIG. 9 illustrates an example diagram of a new sequence structure for a reference signal (RS) according to an embodiment of the present disclosure;

[0114] FIG. 10 illustrates an example diagram of a new sequence structure with gaps for reference signals (RS) according to an embodiment of the present disclosure;

[0115] FIG. 11 illustrates an example diagram of a new sequence structure with repetition in frequency domain for a reference signal (RS) according to an embodiment of the present disclosure;

[0116] FIG. 12 illustrates an example diagram of a new DMRS pattern structure with repetition in time domain according to an embodiment of the present disclosure;

[0117] FIG. 13 illustrates an example diagram of a new DMRS pattern structure with repetition in frequency domain according to an embodiment of the present disclosure;

[0118] FIG. 14 illustrates an example diagram of a sequence repetition format of uplink gURS according to an embodiment of the present disclosure;

[0119] FIG. 15 illustrates an example diagram of N repetitions of a signal of gURS according to an embodiment of the present disclosure;

[0120] FIG. 16 illustrates an example diagram of N repetitions of a signal of gURS according to an embodiment of the present disclosure;

[0121] FIG. 17 illustrates an example structure diagram illustrating a user equipment UE according to an embodiment of the present disclosure;

[0122] FIG. 18 illustrates an example structural diagram illustrating a network device according to an embodiment of the present disclosure.

[0123] The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of various embodiments of the present disclosure as defined by the claims and their equivalents. It includes various specific details to assist in that understanding but these are to be regarded as merely exemplary. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the various embodiments described herein can be made without departing from the scope and spirit of the present disclosure. In addition, descriptions of well-known functions and constructions may be omitted for clarity and conciseness.

[0124] The terms and words used in the following description and claims are not limited to the bibliographical meanings, but, are merely used by the inventor to enable a clear and consistent understanding of the present disclosure. Accordingly, it should be apparent to those skilled in the art that the following description of various embodiments of the present disclosure is provided for illustration purpose only and not for the purpose of limiting the present disclosure as defined by the appended claims and their equivalents.

[0125] It is to be understood that the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to "a component surface" includes reference to one or more of such surfaces.

[0126] The term "include" or "may include" refers to the existence of a corresponding disclosed function, operation or component which can be used in various embodiments of the present disclosure and does not limit one or more additional functions, operations, or components. The terms such as "include" and / or "have" may be construed to denote a certain characteristic, number, step, operation, constituent element, component or a combination thereof, but may not be construed to exclude the existence of or a possibility of addition of one or more other characteristics, numbers, steps, operations, constituent elements, components or combinations thereof.

[0127] The term "or" used in various embodiments of the present disclosure includes any or all of combinations of listed words. For example, the expression "A or B" may include A, may include B, or may include both A and B.

[0128] Unless defined differently, all terms used herein, which include technical terminologies or scientific terminologies, have the same meaning as that understood by a person skilled in the art to which the present disclosure belongs. Such terms as those defined in a generally used dictionary are to be interpreted to have the meanings equal to the contextual meanings in the relevant field of art, and are not to be interpreted to have ideal or excessively formal meanings unless clearly defined in the present disclosure.

[0129] The various embodiments of the present disclosure can be applied to various communication systems, such as: global system for mobile communications (GSM) system, code division multiple access (CDMA) system, broadband code division multiple access (WCDMA) system, general packet radio service (GPRS), long term evolution (LTE) system Frequency division duplex (FDD) systems, time division duplex (TDD) systems, universal mobile telecommunications systems (UMTS), global interoperability for microwave access (WiMAX) communication systems, fifth generation (5G) systems or new wireless (NR) systems, etc. In addition, the various embodiments of the present disclosure can be applied to future oriented communication technologies.

[0130] FIG. 1 illustrates an example wireless network 100 according to various embodiments of the present disclosure. The embodiment of the wireless network 100 shown in FIG. 1 is for illustration only. Other embodiments of the wireless network 100 can be used without departing from the scope of the present disclosure.

[0131] The wireless network 100 includes a gNodeB (gNB) 101, a gNB 102, and a gNB 103. gNB 101 communicates with gNB 102 and gNB 103. gNB 101 also communicates with at least one Internet Protocol (IP) network 130, such as the Internet, a private IP network, or other data networks.

[0132] Depending on a type of the network, other well-known terms such as "base station" or "access point" can be used instead of "gNodeB" or "gNB". For convenience, the terms "gNodeB" and "gNB" are used in this patent document to refer to network infrastructure components that provide wireless access for remote terminals. And, depending on the type of the network, other well-known terms such as "mobile station", "user station", "remote terminal", "wireless terminal" or "user apparatus" can be used instead of "user equipment" or "UE". For convenience, the terms "user equipment" and "UE" are used in this patent document to refer to remote wireless devices that wirelessly access the gNB, no matter whether the UE is a mobile device (such as a mobile phone or a smart phone) or a fixed device (such as a desktop computer or a vending machine).

[0133] gNB 102 provides wireless broadband access to the network 130 for a first multiple User Equipments (UEs) within a coverage area 120 of gNB 102. The first multiple UEs include a UE 111, which may be located in a Small Business (SB); 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 (R); a UE 115, which may be located in a second residence (R); a UE 116, which may be a mobile device (M), such as a cellular phone, a wireless laptop computer, a wireless PDA, etc. GNB 103 provides wireless broadband access to network 130 for a second multiple UEs within a coverage area 125 of gNB 103. The second multiple UEs include a UE 115 and a UE 116. In some embodiments, one or more of gNBs 101-103 can communicate with each other and with UEs 111-116 using 5G, Long Term Evolution (LTE), LTE-A, WiMAX or other advanced wireless communication technologies.

[0134] The dashed lines show approximate ranges of the coverage areas 120 and 125, and the ranges are shown as approximate circles merely for illustration and explanation purposes. It should be clearly understood that the coverage areas associated with the gNBs, such as the coverage areas 120 and 125, may have other shapes, including irregular shapes, depending on configurations of the gNBs and changes in the radio environment associated with natural obstacles and man-made obstacles.

[0135] As will be described in more detail below, one or more of gNB 101, gNB 102, and gNB 103 include a 2D antenna array as described in embodiments of the present disclosure. In some embodiments, one or more of gNB 101, gNB 102, and gNB 103 support codebook designs and structures for systems with 2D antenna arrays.

[0136] Although FIG. 1 illustrates an example of the wireless network 100, various changes can be made to FIG. 1. The wireless network 100 can include any number of gNBs and any number of UEs in any suitable arrangement, for example. Furthermore, gNB 101 can directly communicate with any number of UEs and provide wireless broadband access to the network 130 for those UEs. Similarly, each gNB 102-103 can directly communicate with the network 130 and provide direct wireless broadband access to the network 130 for the UEs. In addition, gNB 101, 102 and / or 103 can provide access to other or additional external networks, such as external telephone networks or other types of data networks.

[0137] FIGs. 2a and 2b illustrate example wireless transmission and reception paths according to the present disclosure. In the following description, the transmission path 200 can be described as being implemented in a gNB, such as gNB 102, and the reception path 250 can be described as being implemented in a UE, such as UE 116. However, it should be understood that the reception path 250 can be implemented in a gNB and the transmission path 200 can be implemented in a UE. In some embodiments, the reception path 250 is configured to support codebook designs and structures for systems with 2D antenna arrays as described in embodiments of the present disclosure.

[0138] The transmission path 200 includes a channel coding and modulation block 205, a Serial-to-Parallel (S-to-P) block 210, a size N Inverse Fast Fourier Transform (IFFT) block 215, a Parallel-to-Serial (P-to-S) block 220, a cyclic prefix addition block 225, and an up-converter (UC) 230. The reception path 250 includes a down-converter (DC) 255, a cyclic prefix removal block 260, a Serial-to-Parallel (S-to-P) block 265, a size N Fast Fourier Transform (FFT) block 270, a Parallel-to-Serial (P-to-S) block 275, and a channel decoding and demodulation block 280.

[0139] In the transmission path 200, the channel coding and modulation block 205 receives a set of information bits, applies coding (such as Low Density Parity Check (LDPC) coding), and modulates the input bits (such as using Quadrature Phase Shift Keying (QPSK) or Quadrature Amplitude Modulation (QAM)) to generate a sequence of frequency-domain modulated symbols. The Serial-to-Parallel (S-to-P) block 210 converts (such as demultiplexes) serial modulated symbols into parallel data to generate N parallel symbol streams, where N is a size of the IFFT / FFT used in gNB 102 and UE 116. The size N IFFT block 215 performs IFFT operations on the N parallel symbol streams to generate a time-domain output signal. The Parallel-to-Serial block 220 converts (such as multiplexes) parallel time-domain output symbols from the Size N IFFT block 215 to generate a serial time-domain signal. The cyclic prefix addition block 225 inserts a cyclic prefix into the time-domain signal. The up-converter 230 modulates (such as up-converts) the output of the cyclic prefix addition block 225 to an RF frequency for transmission via a wireless channel. The signal can also be filtered at a baseband before switching to the RF frequency.

[0140] The RF signal transmitted from gNB 102 arrives at UE 116 after passing through the wireless channel, and operations in reverse to those at gNB 102 are performed at UE 116. The down-converter 255 down-converts the received signal to a baseband frequency, and the cyclic prefix removal block 260 removes the cyclic prefix to generate a serial time-domain baseband signal. The Serial-to-Parallel block 265 converts the time-domain baseband signal into a parallel time-domain signal. The Size N FFT block 270 performs an FFT algorithm to generate N parallel frequency-domain signals. The Parallel-to-Serial block 275 converts the parallel frequency-domain signal into a sequence of modulated data symbols. The channel decoding and demodulation block 280 demodulates and decodes the modulated symbols to recover the original input data stream.

[0141] Each of gNBs 101-103 may implement a transmission path 200 similar to that for transmitting to UEs 111-116 in the downlink, and may implement a reception path 250 similar to that for receiving from UEs 111-116 in the uplink. Similarly, each of UEs 111-116 may implement a transmission path 200 for transmitting to gNBs 101-103 in the uplink, and may implement a reception path 250 for receiving from gNBs 101-103 in the downlink.

[0142] Each of the components in FIGs. 2a and 2b can be implemented using only hardware, or using a combination of hardware and software / firmware. As a specific example, at least some of the components in FIGs. 2a and 2b may be implemented in software, while other components may be implemented in configurable hardware or a combination of software and configurable hardware. For example, the FFT block 270 and IFFT block 215 may be implemented as configurable software algorithms, in which the value of the size N may be modified according to the implementation.

[0143] Furthermore, although described as using FFT and IFFT, this is only illustrative and should not be interpreted as limiting the scope of the present disclosure. Other types of transforms can be used, such as Discrete Fourier transform (DFT) and Inverse Discrete Fourier Transform (IDFT) functions. It should be understood that for DFT and IDFT functions, the value of variable N may be any integer (such as 1, 2, 3, 4, etc.), while for FFT and IFFT functions, the value of variable N may be any integer which is a power of 2 (such as 1, 2, 4, 8, 16, etc.)

[0144] Although FIGs. 2a and 2b illustrate examples of wireless transmission and reception paths, various changes may be made to FIGs. 2a and 2b. For example, various components in FIGs. 2a and 2b can be combined, further subdivided or omitted, and additional components can be added according to specific requirements. Furthermore, FIGs. 2a and 2b are intended to illustrate examples of types of transmission and reception paths that can be used in a wireless network. Any other suitable architecture can be used to support wireless communication in a wireless network.

[0145] FIG. 3a illustrates an example UE 116 according to the present disclosure. The embodiment of UE 116 shown in FIG. 3a is for illustration only, and UEs 111-115 of FIG. 1 can have the same or similar configuration. However, a UE has various configurations, and FIG. 3a does not limit the scope of the present disclosure to any specific implementation of the UE.

[0146] UE 116 includes an antenna 305, a radio frequency (RF) transceiver 310, a transmission (TX) processing circuit 315, a microphone 320, and a reception (RX) processing circuit 325. UE 116 also includes a speaker 330, a processor / controller 340, an input / output (I / O) interface 345, an input device(s) 350, a display 355, and a memory 360. The memory 360 includes an operating system (OS) 361 and one or more applications 362.

[0147] The RF transceiver 310 receives an incoming RF signal transmitted by a gNB of the wireless network 100 from the antenna 305. The RF transceiver 310 down-converts the incoming RF signal to generate an intermediate frequency (IF) or baseband signal. The IF or baseband signal is transmitted to the RX processing circuit 325, where the RX processing circuit 325 generates a processed baseband signal by filtering, decoding and / or digitizing the baseband or IF signal. The RX processing circuit 325 transmits the processed baseband signal to speaker 330 (such as for voice data) or to processor / controller 340 for further processing (such as for web browsing data).

[0148] The TX processing circuit 315 receives analog or digital voice data from microphone 320 or other outgoing baseband data (such as network data, email or interactive video game data) from processor / controller 340. The TX processing circuit 315 encodes, multiplexes, and / or digitizes the outgoing baseband data to generate a processed baseband or IF signal. The RF transceiver 310 receives the outgoing processed baseband or IF signal from the TX processing circuit 315 and up-converts the baseband or IF signal into an RF signal transmitted via the antenna 305.

[0149] The processor / controller 340 can include one or more processors or other processing devices and execute an OS 361 stored in the memory 360 in order to control the overall operation of UE 116. For example, the processor / controller 340 can control the reception of forward channel signals and the transmission of backward channel signals through the RF transceiver 310, the RX processing circuit 325 and the TX processing circuit 315 according to well-known principles. In some embodiments, the processor / controller 340 includes at least one microprocessor or microcontroller.

[0150] The processor / controller 340 is also capable of executing other processes and programs residing in the memory 360, such as operations for channel quality measurement and reporting for systems with 2D antenna arrays as described in embodiments of the present disclosure. The processor / controller 340 can move data into or out of the memory 360 as required by an execution process. In some embodiments, the processor / controller 340 is configured to execute the application 362 based on the OS 361 or in response to signals received from the gNB or the operator. The processor / controller 340 is also coupled to an I / O interface 345, where the I / O interface 345 provides UE 116 with the ability to connect to other devices such as laptop computers and handheld computers. I / O interface 345 is a communication path between these accessories and the processor / controller 340.

[0151] The processor / controller 340 is also coupled to the input device(s) 350 and the display 355. An operator of UE 116 can input data into UE 116 using the input device(s) 350. The display 355 may be a liquid crystal display or other display capable of presenting text and / or at least limited graphics (such as from a website). The memory 360 is coupled to the processor / controller 340. A part of the memory 360 can include a random access memory (RAM), while another part of the memory 360 can include a flash memory or other read-only memory (ROM).

[0152] Although FIG. 3a illustrates an example of UE 116, various changes can be made to FIG. 3a. For example, various components in FIG. 3a can be combined, further subdivided or omitted, and additional components can be added according to specific requirements. As a specific example, the processor / controller 340 can be divided into multiple processors, such as one or more central processing units (CPUs) and one or more graphics processing units (GPUs). Furthermore, although FIG. 3a illustrates that the UE 116 is configured as a mobile phone or a smart phone, UEs can be configured to operate as other types of mobile or fixed devices.

[0153] FIG. 3b illustrates an example gNB 102 according to the present disclosure. The embodiment of gNB 102 shown in FIG. 3b is for illustration only, and other gNBs of FIG. 1 can have the same or similar configuration. However, a gNB has various configurations, and FIG. 3b does not limit the scope of the present disclosure to any specific implementation of a gNB. It should be noted that gNB 101 and gNB 103 can include the same or similar structures as gNB 102.

[0154] As shown in FIG. 3b, gNB 102 includes multiple antennas 370a-370n, multiple RF transceivers 372a-372n, a transmission (TX) processing circuit 374, and a reception (RX) processing circuit 376. In certain embodiments, one or more of the multiple antennas 370a-370n include a 2D antenna array. gNB 102 also includes a controller / processor 378, a memory 380, and a backhaul or network interface 382.

[0155] RF transceivers 372a-372n receive an incoming RF signal from antennas 370a-370n, such as a signal transmitted by UEs or other gNBs. RF transceivers 372a-372n down-convert the incoming RF signal to generate an IF or baseband signal. The IF or baseband signal is transmitted to the RX processing circuit 376, where the RX processing circuit 376 generates a processed baseband signal by filtering, decoding and / or digitizing the baseband or IF signal. RX processing circuit 376 transmits the processed baseband signal to controller / processor 378 for further processing.

[0156] The TX processing circuit 374 receives analog or digital data (such as voice data, network data, email or interactive video game data) from the controller / processor 378. TX processing circuit 374 encodes, multiplexes and / or digitizes outgoing baseband data to generate a processed baseband or IF signal. RF transceivers 372a-372n receive the outgoing processed baseband or IF signal from TX processing circuit 374 and up-convert the baseband or IF signal into an RF signal transmitted via antennas 370a-370n.

[0157] The controller / processor 378 can include one or more processors or other processing devices that control the overall operation of gNB 102. For example, the controller / processor 378 can control the reception of forward channel signals and the transmission of backward channel signals through the RF transceivers 372a-372n, the RX processing circuit 376 and the TX processing circuit 374 according to well-known principles. The controller / processor 378 can also support additional functions, such as higher-level wireless communication functions. For example, the controller / processor 378 can perform a Blind Interference Sensing (BIS) process such as that performed through a BIS algorithm, and decode a received signal from which an interference signal is subtracted. A controller / processor 378 may support any of a variety of other functions in gNB 102. In some embodiments, the controller / processor 378 includes at least one microprocessor or microcontroller.

[0158] The controller / processor 378 is also capable of executing programs and other processes residing in the memory 380, such as a basic OS. The controller / processor 378 can also support channel quality measurement and reporting for systems with 2D antenna arrays as described in embodiments of the present disclosure. In some embodiments, the controller / processor 378 supports communication between entities such as web RTCs. The controller / processor 378 can move data into or out of the memory 380 as required by an execution process.

[0159] The controller / processor 378 is also coupled to the backhaul or network interface 382. The backhaul or network interface 382 allows gNB 102 to communicate with other devices or systems through a backhaul connection or through a network. The backhaul or network interface 382 can support communication over any suitable wired or wireless connection(s). For example, when gNB 102 is implemented as a part of a cellular communication system, such as a cellular communication system supporting 5G or new radio access technology or NR, LTE or LTE-A, the backhaul or network interface 382 can allow gNB 102 to communicate with other gNBs through wired or wireless backhaul connections. When gNB 102 is implemented as an access point, the backhaul or network interface 382 can allow gNB 102 to communicate with a larger network, such as the Internet, through a wired or wireless local area network or through a wired or wireless connection. The backhaul or network interface 382 includes any suitable structure that supports communication through a wired or wireless connection, such as an Ethernet or an RF transceiver.

[0160] The memory 380 is coupled to the controller / processor 378. A part of the memory 380 can include an RAM, while another part of the memory 380 can include a flash memory or other ROMs. In certain embodiments, multiple instructions, such as the BIS algorithm, are stored in the memory. The multiple instructions are configured to cause the controller / processor 378 to execute the BIS process and decode the received signal after subtracting at least one interference signal determined by the BIS algorithm.

[0161] As will be described in more detail below, the transmission and reception paths of gNB 102 (implemented using RF transceivers 372a-372n, TX processing circuit 374 and / or RX processing circuit 376) support aggregated communication with FDD cells and TDD cells.

[0162] Although FIG. 3b illustrates an example of gNB 102, various changes may be made to FIG. 3b. For example, gNB 102 can include any number of each component shown in FIG. 3a. As a specific example, the access point can include many backhaul or network interfaces 382, and the controller / processor 378 can support routing functions to route data between different network addresses. As another specific example, although shown as including a single instance of the TX processing circuit 374 and a single instance of the RX processing circuit 376, gNB 102 can include multiple instances of each (such as one for each RF transceiver).

[0163] The time domain unit (also called time unit) in this application may be: an OFDM symbol, an OFDM symbol group (consisting of multiple OFDM symbols), a slot, a slot group (consisting of multiple slots), a subframe, a subframe group (consisting of multiple subframes), a system frame, a system frame group (composed of multiple system frames); may also be in absolute time units, such as 1 millisecond, 1 second, etc.; the time unit may also be a combination of multiple granularities, such as N1 slots plus N2 OFDM symbols.

[0164] The frequency domain unit (also called frequency unit) in this application may be: a subcarrier, a subcarrier group (composed of multiple subcarriers), a resource block (resource block, RB), which may also be called a physical resource block (physical resource block, PRB), a resource block group (consisting of multiple RBs), a bandwidth part (BWP), a bandwidth part group (consisting of multiple BWPs), a frequency band / carrier, a frequency band group / carrier group; may also be in absolute frequency domain units, such as 1 Hz, 1 kHz, etc.; frequency domain unit may also be a combination of multiple granularities, such as M1 PRBs plus M2 subcarriers.

[0165] The exemplary embodiments of the present disclosure are further described below in conjunction with the accompanying drawings.

[0166] The text and drawings are provided as examples only to aid the reader in understanding the present disclosure. They are not intended, nor should they be construed, to limit the scope of the disclosure in any way. Although certain embodiments and examples have been provided, it will be apparent to those skilled in the art, based upon this disclosure, that changes may be made to the embodiments and examples shown without departing from the scope of the disclosure.

[0167] Those skilled in the art will understand that, as used herein, the singular forms "a," "an," "the," and "said" are intended to include the plural forms as well, unless the context clearly dictates otherwise. It should be further understood that the term "include" used in the specification of this application refers to the presence of stated features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. It will be understood that when we refer to an element as being "connected" or "coupled" to another element, it may be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. As used herein, the term "and / or" includes all or any units and all combinations of one or more of the associated listed items.

[0168] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless specifically defined herein.

[0169] It will be understood by those skilled in the art that "terminal", "terminal device", as used herein, includes both devices that are wireless signal receiver, which are provided with only wireless signal receiver without transmission capability, and devices that are receive and transmit hardware, which are provided with receive and transmit hardware capable of bidirectional communication over a bidirectional communication link. Such devices may include: cellular or other communication devices with single line displays or multi-line displays or cellular or other communication devices without multi-line displays; a PCS (Personal Communications Service), which may combine voice, data processing, facsimile and / or data communications capabilities; a PDA (Personal Digital Assistant) that may include a radio frequency receiver, a pager, Internet / intranet access, a web browser, a notepad, a calendar and / or a GPS (Global Positioning System) receiver; a conventional laptop and / or palmtop computer or other device that has and / or includes a conventional laptop and / or palmtop computer or other device that has a radio frequency receiver. "Terminal", "terminal device", as used herein, may be portable, transportable, installed in a vehicle (aeronautical, marine, and / or land), or adapted and / or configured to operate locally, and / or in a distributed fashion, at any other location in earth and / or space. "Terminal", "terminal device", as used herein, may also be a communication terminal, a web terminal, a music / video playing terminal, and may be, for example, a PDA, a MID (Mobile Internet Device), and / or a mobile phone with music / video playing function, and may also be a smart TV, a set-top box, or the like device.

[0170] The term "transmit" in the present invention may be used interchangeably with "transmit", "report", "inform", and the like without departing from the scope of the present invention.

[0171] The text and drawings are merely provided by way of example to aid the reader in understanding the present disclosure. They are not intended, nor should they be construed, to limit the scope of the present disclosure in any way. Although certain embodiments and examples have been provided, it will be apparent to those of skill in the art, based upon the disclosure herein, that changes can be made to the embodiments and examples shown without departing from the scope of the disclosure.

[0172] The transmission links of the wireless communication system mainly comprise downlink communication links by the 5G gNB to the user equipment (UE) and uplink communication links by the UE to the network.

[0173] Nodes for positioning measurements in a wireless communication system, such as current wireless communication systems, include a UE that initiates a positioning request message, a Location Management Function (LMF) for positioning of the UE and transmission of positioning assistance data, a gNB or Transmission-Reception Point (TRP) that broadcasts positioning assistance data and makes uplink positioning measurements, a UE for downlink positioning measurements. Furthermore, the method of the present invention may also be extended to apply in other communication systems, e.g. automotive communication (V2X), e.g. sidelink communication, in such case the transmission reception point or UE may be any device in V2X.

[0174] Transmissions in a wireless communication system include transmissions by a base station (gNB) to a user equipment (UE), referred to as downlink transmissions, corresponding slots referred to as downlink slots, and transmissions by a UE to a base station device, referred to as uplink transmissions, corresponding slots referred to as uplink slots.

[0175] In downlink communication of a wireless communication system, the system transmits synchronization signals and broadcast channels to users over a synchronization signal block (synchronization signal / PBCH block, SSB) with a periodicity, the periodicity is a synchronization signal block periodicity (SSB periodicity), otherwise known as a synchronization signal block burst periodicity (SSB burst periodicity). At the same time, the base station configures a physical random access channel configuration period (PRACH configuration period) in which a certain number of random access transmission occasions (also referred to as PRACH transmission occasions, ROs) are configured, the configured ROs being determined by a certain validity rule to obtain valid ROs; and it is satisfied that within an association period (a certain length of time) all SSBs can be mapped onto the corresponding valid ROs, in an SSB to RO mapping cycle, all SSBs within one SSB periodicity can be exactly mapped onto the required random access resources, there may be one or more mapping cycles within one association period. One SSB-to-RO association pattern period contains one or more association periods, and the SSB-to-RO mapping patterns in each association pattern period are the same.

[0176] In New Radio (NR) communication systems, before radio resource control is established, such as during the random access process, the performance of random access directly affects the user experience. In traditional wireless communication systems, such as LTE and LTE-Advanced, or in 5G or NR systems, the random access process is applied to multiple scenarios such as establishing initial link, cell handover, re-establishing uplink link, RRC connection reestablishment, etc., and is divided into contention-based random access and contention-free random access according to whether the user monopolizes the preamble sequence resources. In contention-based random access, each user selects a preamble sequence from the same preamble sequence resource when trying to establish an uplink link.

[0177] FIG. 4 illustrates a schematic diagram of a 4-step random access procedure. For example, the contention-based random access process is divided into four steps, as shown in FIG.4. In the first step, the user randomly selects a preamble sequence from the preamble sequence (also interchangeably referred to as "preamble" herein) resource pool and transmits it to the base station. The base station performs correlation detection on the received signal, thereby identifying the preamble sequence transmitted by the user; in the second step, the base station transmits to the user a random access response (RAR), including a random access preamble sequence identifier, a timing advance command determined based on the time delay estimation between the user and the base station, and a temporary cell-radio network temporary identifier (C-RNTI), and the time-frequency resources allocated for next uplink transmission of the user; the user shall search for the PDCCH carrying such feedback based on the RA-RNTI associated with the PRACH occasion where the random access preamble sequence is transmitted. The RA-RNTI associated with the PRACH occasion (RO) for transmitting the random access preamble sequence is calculated according to the following formula:

[0178] RA-RNTI = 1 + s_id + 14 Х t_id + 14 Х 80 Х f_id + 14 Х 80 Х 8 Х ul_carrier_id,

[0179] where s_id is the index of the first OFDM symbol of this PRACH occasion (0 < s_id < 14), t_id is the index of the first slot of this PRACH occasion in the system frame (0 < t_id < 80), where the subcarrier spacing used to determine t_id is based on the value of specified in TS 38.211, section 5.3. 2, for = {0, 1, 2, 3}, for = {5, 6}, t_id is the index of the 120 kHz slot containing the PRACH occasion in the system frame (0 < t_id < 80), f_id is the index of the PRACH occasion in frequency domain (0 < f_id < 8), UL_carrier_id is the UL carrier used for random access preamble transmission (0 for normal uplink (NUL) carrier, 1 for SUL carrier).

[0180] In the third step, the user transmits a third message (message 3, Msg3) to the base station based on the information in the RAR. Msg3 contains information such as user terminal identifier and RRC connection request and the like, where the user terminal identifier is unique to the user and is used to resolve contention; in the fourth step, the base station transmits a contention resolution identifier to the user, including the identifier of the user terminal that wins in the contention resolution. After detecting its own identifier, the user upgrades the temporary C-RNTI to C-RNTI, transmits an ACK signal to the base station, completing the random access procedure, and waits for the scheduling of the base station. Otherwise, the user will start a new random access procedure after a delay of time.

[0181] For the contention-free random access procedure, since the base station knows the user identifier, and may allocates a preamble sequence to the user. Therefore, when transmitting the preamble sequence, the user does not need to randomly select a sequence, but uses the allocated preamble sequence. After detecting the allocated preamble sequence, the base station will transmit a corresponding random access response, including timing advance and uplink resource allocation information. After receiving the random access response, the user considers that the uplink synchronization has been completed and waits for further scheduling of the base station. Therefore, the contention-free random access procedure only includes two steps: step 1 is to transmit the preamble sequence; step 2 is to transmit a random access response.

[0182] For example, the random access procedure is applicable to the following scenarios:

[0183] 1. Initial access in RRC_IDLE;

[0184] 2. Re-establish RRC connection;

[0185] 3. Cell handover;

[0186] 4. Downlink data arrives in RRC connected state and requests a random access procedure (when the uplink is asynchronous);

[0187] 5. Uplink data arrives in the RRC connected state and requests a random access procedure (when the uplink is asynchronous or no resources are allocated to the scheduling request in the PUCCH resources);

[0188] 6. Positioning.

[0189] When accessing the 5G wireless communication system, if beamforming technology is used, and the UE needs to find a (e.g., transmit and / or receive) beam that is operable to communicate with the base station. The base station or UE needs to use a separate reference signal (such as CSI-RS or SRS) to transmit each possible beam, and then the reference signal is measured by the UE or base station to obtain the (e.g., transmit and / or receive) beam which is operable; however, the resource overhead and delay of this method are relatively large. Therefore, how to obtain more accurate (transmit and / or receive) beams that is operable quickly and / or with less resource overhead is a problem that needs to be solved.

[0190] Aspects and principles of the present disclosure will be described in more detail below, with reference to the accompanying drawings and examples. It is to be understood that the following description is by way of example only, and that the terms or nouns used are by way of example only and are not intended to be limiting. In addition, in the description of the present disclosure, for convenience of description, when describing a general uplink reference signal or downlink reference signal, the number of reference signals, the number of sequences of the reference signal, the number of repetitions of the reference signal, or the number of repetitions of the sequence of the reference signal will be described as N, and N is described 3 as an example, and accordingly the number of associated beams used for transmission or reception is described as 3 as an example, however this is only exemplary. It may be understood that the principles and technical essence of the present disclosure can also be applied to the case where repetition number N is other values, and also to the case where the number of associated beams is other values. All of these, are within the scope of the present disclosure.

[0191] In the embodiments of the present invention, a method and device for communication system access (for example, initial access, random access, etc., hereinafter referred to as "system access") will be introduced. In embodiments of the present disclosure, a first beam mode may be used for the transmission and / or reception of the reference signal, and the first beam mode uses multiple beams with an association relationship to transmit and / or receive the signal, thereby enabling the transmission and / or reception of the signal with less latency, lower overhead, or higher / more flexible granularity for beam management to obtain narrow beams for communication. In an implementation, the first beam mode uses multiple beams with an association relationship to transmit multiple repetitions related to the reference signal, and for reception of the multiple repetitions, the same beam or multiple beams with an association relationship may be used. In an implementation, the same beam may be used to transmit multiple repetitions related to the reference signal, and for the reception of the multiple repetitions, multiple beams with an association relationship may be used for reception. Through the method provided by the embodiments of the present disclosure, the association relationship between beams transmitting multiple repetitions related to the reference signal may be utilized to quickly perform beam management based on the measurement results of the multiple repetitions to obtain narrow beams for communication.

[0192] In the description of the present disclosure, "beam" may be described instead as "spatial filter", "quasi-co-located (QCL) antenna port", "QCLed time-frequency resource", "QCL source", "QCL assumption", "TCI state", "resource index", etc., "beam index" may be described instead as other resource indexes, such as "spatial filter coefficient", "quasi-co-located (QCL) antenna port number", " QCLed time-frequency resource index", "QCL source index", "QCL assumption index", "TCI state index", "resource index", etc.

[0193] In an implementation, the first beam mode relates to differential beamforming (DBF), whereby the first beam mode relates to transmitting and / or receiving signals using a sum beam and at least one differential beam. By applying DBF to the signal transmission at the transmitting end and / or the signal reception at the receiving end, the base station and the UE may quickly determine the transmit direction and / or receive direction of the signal, which is beneficial to quickly determining the appropriate transmit beam and / or or receive beam. For convenience of description and easier understanding, differential beamforming is used in the present disclosure as an example of the first beam mode to explain the solution, but this is only exemplary and is for the convenience of the inventor to fully describe his technical concepts and technical principles, rather than for the purpose of limiting the principles of the present disclosure only to system access method using differential beamforming.

[0194] It may be understood that although most of the description of the present disclosure describes the system access solution using DBF as an example of the first beam mode applied to the transmission and / or reception of signals, the principles disclosed in the present disclosure can equally applied to scenarios using other technical solutions as the first beam mode. For example, for a scenario in which a solution that has optimized beam codebook design as the first beam mode, the technique of the present disclosure may also be applicable.

[0195] Two parts may be included in the system access of the present invention, the transmission and / or reception of a general downlink reference signal (gDRS), and / or the transmission and / or reception of a general uplink reference signal (gURS). In the present invention, SSB is used as an example of a general downlink reference signal related to system access for description of the solution, but this is only exemplary, and SSB may also be replaced by other gDRS, such as CSI-RS, PRS, etc. In the present invention, PRACH is used as an example of a general uplink reference signal related to system access to describe the solution, but this is only exemplary, and PRACH may also be replaced by other gURS, such as SRS, etc.

[0196] The method provided by the present invention may include one or a combination of multiple operations of the following operations:

[0197] ●The UE receives gDRS transmitted by for example a network device (such as a base station, etc.),for example, the gDRS may include SSB, DMRS, or reference signals dedicated to beam management, where:

[0198] ■ when the gDRS is SSB signal, the SSB signal to be received may include multiple signals and / or sequences, the multiple signals may be different signals or multiple repetitions of a signal, and the multiple sequences may be multiple different sequences, may also be multiple repetitions of a sequence. For convenience of description, in the description of the present disclosure, multiple signals and / or sequences are described as multiple repetitions of a signal and / or sequence, but this is only exemplary, and the principles and essence described in the present disclosure can cover various possible specific embodiments in which the SSB signal to be received includes multiple signals and / or sequences. For example, the manner in which the SSB signal includes multiple repetitions of a signal described below can also be replaced by including multiple signals, and the manner in which the SSB signal includes multiple repetitions of a sequence can also be replaced by including multiple different sequences. The following description will take the example that the SSB signal includes multiple repetitions of a signal and / or sequence as an example, and the structure of the SSB may include one or more of the following:

[0199] ◆ a full repetition structure, for example, each SSB is completely repeated N times. If there are M SSBs in an SSB transmission time unit, a total of M * N SSB transmission occasions may be used to transmit, with M = 2, N = 3 as an example, as shown in FIG. 5, where repetition 0 of SSB0 is transmitted using a first beam, repetition 1 and repetition 2 of SSB0 are transmitted using a second beam and a third beam associated with the first beam, and repetitions 0, 1, 2 of SSB1 are transmitted in the same way.

[0200] ▶ In an implementation, the repetitions corresponding to the same SSB index are continuous or adjacent in time domain;

[0201] ▶ In an implementation, there may be first time gap(s) in time domain between the repetitions corresponding to the same SSB index, and the first time gap(s) can facilitate beam switching when the network device transmits the SSB;

[0202] ▶ In an implementation, the repetitions of the SSB may also be repeated in frequency domain, for example, when the network device can transmit multiple beams at the same time, as shown in FIG. 6, the multiple repetitions of the SSB may repeat in frequency domain by way of frequency division;

[0203] ◆ reference signal (RS) repetition in SSB, for example, instead of overall SSB repetition, only RS repetition in SSB is required, where the RS may be PSS and / or SSS and / or DMRS in PBCH. Taking the reference signal repetition in the SSB as PSS repetition as an example, there may be N repeated PSS in one SSB, as shown in the SSB structure carrying PSS repetition shown in FIG. 7, where repetition 0 of PSS in an SSB is transmitted using a first beam, repetitions 1 and 2 of PSS are transmitted using a second beam and a third beam associated with the first beam.

[0204] ▶ In an implementation, the repeated RSs are continuous or adjacent in time domain.

[0205] ▶ In an implementation, there is first time gap(s) in time domain between the repeated RSs, and the first time gap may facilitate beam switching by the network device when transmitting signals;

[0206] ▶ In an implementation, the repeated RSs may also be repeated in frequency domain, for example, when the network device may transmit multiple beams at the same time, as shown in FIG. 8,

[0207] ◆ a new sequence structure of the reference signal RS in SSB, for example a repetition structure containing N sequences in one reference signal RS, forms a new sequence structure, where the RS may be PSS and / or SSS and / or DMRS in PBCH. Taking the sequence of the reference signal as the sequence of PSS as an example, there are N repeated PSS sequences in a new PSS sequence, as the new PSS sequence structure carrying repeated PSS sequences shown in FIG. 9, where the sequence repetition 0 in a new PSS sequence is transmitted using a first beam, and the sequence repetition 1 and sequence repetition 2 in the new PSS sequence are transmitted using a second beam and a third beam associated with the first beam.

[0208] ▶ In an implementation, the sequence repetitions in the new PSS sequence are consecutive or adjacent in time domain.

[0209] ▶ In an implementation, there is first time gap(s) in time domain between the sequence repetitions in the new PSS sequence (GAP0, GAP1, GAP2 as in FIG. 10), the first time gap may facilitate beam switching by the network device when transmitting signals; where GAP0, GAP1, and GAP2 may be the same (for example, all equal to the first time gap) or have separate time unit values; in an implementation, GAP2 may be absent;

[0210] ▶ In an implementation, the new sequence structure of the reference signal RS contains N repeated sequences multiplexed in frequency domain, for example, when the network device can transmit multiple beams at the same time, as shown in FIG. 11;

[0211] ▶ In an implementation, the new sequence structure of the reference signal RS includes N repeated sequences multiplexed in frequency domain, and there may be the same or different frequency domain intervals between individual repetitions;

[0212] ◆ The N or M is a positive integer, which may be a predefined value or a value configured by the network device;

[0213] ◆ The first time gap may be:

[0214] ▶ a value of the number of time units predefined or configured by the network;

[0215] ▶ obtained by shifting the sequence with a first sample number;

[0216] ■ when the gDRS is DMRS, the DMRS to be received may include multiple signals and / or sequences, the multiple signals may be different signals or multiple repetitions of a signal, the multiple sequences may be multiple different sequences, or multiple repetitions of a sequence. For convenience of description, in the description of the present disclosure, multiple signals and / or sequences are described as multiple repetitions of a signal and / or sequence, but this is only exemplary, and the principles and essence described in the present disclosure may cover various possible specific implementations in which the DMRS to be received includes multiple signals and / or sequences. For example, the manner in which the DMRS includes multiple repetitions of a signal described below may also be replaced by including multiple signals, and the manner in which the DMRS includes multiple repetitions of a sequence may also be replaced by including multiple different sequences. The following description will take the DMRS including multiple repetitions of a signal and / or sequence as an example, and the structure of the DMRS may be a combination of one or more of the following manners:

[0217] ◆ using a generation method similar to the structure of the aforementioned SSB signal to be received, for example:

[0218] ▶ repetition of the PBCH, PDSCH, or PDCCH signal containing DMRS, for specific operation methods, please refer to the above description of the full repetition structure of the SSB. For example, each PBCH, PDSCH, or PDCCH signal containing DMRS is completely repeated N times. If there are M PBCH, PDSCH, or PDCCH signals in the DMRS transmission time unit, a total of M * N transmission occasions of PBCH, PDSCH, or PDCCH signals may be used to transmit. Taking M = 2, N = 3, and the fully repeated signals as PDSCH including DMRS as an example, in which repetition 0 of PDSCH0 is transmitted using a first beam, repetition 1 and repetition 2 of PDSCH0 are transmitted using a second beam and a third beam associated with the first beam, and repetitions 0, 1, 2 of PDSCH1 are transmitted in the same way.;

[0219] ▶ repetition of DMRS symbols in PBCH, PDSCH, and PDCCH. For specific operation methods, please refer to the above description of the reference signal (RS) repetition in SSB. For example, instead of repetition of PBCH, PDSCH, or PDCCH as a whole, only repetition of DMRS symbols therein is required. Taking the reference signal as the DMRS included in PDSCH and the number of repetitions N = 3 as an example, in such structure, there may be 3 repeated DMRSs in the PDSCH, where repetition 0 of the DMRS in the PDSCH is transmitted using a first beam, and repetition 1 and repetition 2 of the DMRS are transmitted using a second beam and a third beam associated with the first beam;

[0220] ▶ the new DMRS sequence structure contains multiple repetitions of a sequence. For specific operation methods, please refer to the above description of the new sequence structure of the reference signal RS in the SSB. For example, a structure in which the DMRS including N repetitions of a sequence, forms a new sequence structure. Taking the number of repetitions of the sequence in the DMRS new sequence structure N = 3 as an example, sequence repetition 0 in the new DMRS sequence is transmitted using a first beam, and sequence repetition 1 and sequence repetition 2 in the new DMRS sequence are transmitted using a second beam and a third beam associated with the first beam;

[0221] ▶ In an implementation, individual repetitions involved in the above DMRS-related repetition structure may be repeated in time domain and / or frequency domain; in an implementation, individual repetitions are continuous or adjacent in time domain and / or frequency domain, or there is(are) the same or different gap(s) between individual repetitions in time domain and / or frequency domain, and the details may be similar to the above example description in conjunction with SSB-related repeating structures;

[0222] ◆ a new DMRS structure, such as using a new DMRS symbol pattern in a PBCH, PDSCH, and PDCCH. Considering that DMRS has the function of estimating channel and demodulating data, when multiple DMRSs are transmitted using different beams, the patterns in time domain and / or frequency domain may have different design methods, and specific methods include a combination of one or more of the following:

[0223] ▶ placing at least one new DMRS repetition in at least one location of the beginning or end of PBCH and / or PDSCH and / or PDCCH in time domain. For example, when the number of new DMRS repetitions is 2, the symbols other than the new DMRS repetition in PBCH and / or PDSCH and / or PDCCH use a first beam, and the new DMRS repetitions use a second beam and / or a third beam respectively, where the second beam and the third beam are associated with the first beam. Taking DMRS as DMRS in PDSCH as an example, as shown in FIG. 12, the two added DMRS repetitions are at the last location of PDSCH, and the two DMRS symbols are transmitted using different beams from the previous PDSCH symbols, for example, the previous PDSCH symbols (including DMRS symbol therein) use the first beam, and the two added DMRSs respectively use the second beam and the third beam related to the first beam;

[0224] ▶ placing new DMRS repetitions in frequency domain at the beginning or end of PBCH, PDSCH, or PDCCH in time domain. For example, at least one DMRS repetition may be placed at the beginning or end symbol of PDSCH in a frequency division multiplexing manner. Taking the number of new DMRS repetitions as 2 as an example, the last symbol of the PDSCH includes two frequency-divided DMRS sequences, and the network device uses a second beam and a third beam to transmit the two frequency-divided DMRS repetitions respectively, and uses a third beam to transmit other symbols of the PDSCH, where the second beam and the third beam are associated with the first beam, as shown in the example of FIG. 13;

[0225] ■ when the gDRS is an RS dedicated to beam management, for example, the UE may determine and obtain an available RS dedicated to beam management based on configuration information by receiving the configuration information for the RS dedicated to beam management from the network device; specific operating methods include combinations of one or more of the following:

[0226] ◆ the UE may receive configuration information for the RS dedicated to beam management through at least one of the following:

[0227] ▶ obtaining the configuration information for the RS dedicated to beam management through PBCH and / or SIB1 PDCCH and / or SIB1 PDSCH. For example, the configuration information for the RS dedicated to beam management is that the UE shares a common RS dedicated to beam management;

[0228] ▶ obtaining the configuration information for the RS dedicated to beam management by receiving MSG2 PDCCH, for example, the configuration information for the RS dedicated to beam management is that a UE group (e.g., there are one or more UEs) shares a common RS dedicated to beam management;

[0229] ▶ obtaining the configuration information for the RS dedicated to beam management by receiving MSG2 PDSCH (e.g., RAR in that PDSCH), e.g., the configuration information for RS dedicated to beam management is an RS dedicated to beam management that is dedicated to the UE;

[0230] ◆ the configuration information for RS dedicated to beam management includes a combination of one or more of:

[0231] ▶ information related to signal structure of the RS dedicated to beam management, for example, the information related to signal structure may include indication information of the signal pattern, information related to the format of the signal (for example, information related to sequence of the RS dedicated to beam management, information related to multiple signals and / or sequences included in the RS dedicated to beam management, etc.), the signal structure may adopt a generation method similar to the aforementioned structure of the SSB signal to be received, similar to the aforementioned description, the RS dedicated to beam management may include multiple signals and / or sequences, the multiple signals may be different signals or multiple repetitions of a signal, and the multiple sequences may be multiple different sequences, or multiple repetitions of a sequence. For convenience of description, in the description of the present disclosure, multiple signals and / or sequences are described as multiple repetitions of a signal and / or a sequence, but this is only exemplary, and the principles and essence described in the present disclosure may cover various possible specific implementations in which the RS dedicated to beam management includes multiple signals and / or sequences. For example, the manner in which the RS dedicated to beam management includes multiple repetitions of a signal described below may also be replaced by including multiple signals, and the manner in which the RS dedicated to beam management includes multiple repetitions of a sequence may also be replaced by including multiple different sequences. The following description will take the example that the RS dedicated to beam management includes multiple repetitions of a signal and / or a sequence, the signal reception of the RS dedicated to beam management may include, for example, at least one of the following:

[0232] - repetition of the RS signal, for the specific operation method, please refer to the above description of repetition of the reference signal (RS) in the SSB signal structure as an example. For example, the RS signal is repeated as a whole.

[0233] - a new RS sequence structure contains multiple repetitions of a sequence, for a specific operation method, please refer to the above description of the new sequence structure of the reference signal RS in the SSB signal structure as an example. For example, the sequence of an RS signal is repeated.

[0234] ▶ resource configuration for RS dedicated to beam management, including one or more of the following:

[0235] - time domain resource configuration information of the RS, for example, time domain starting location, including time domain starting location determined based on a time unit gap value from a time reference point, the time reference point may be an absolute time reference point such as SFN0 or a specified time, may also be a time reference point of a related signal, such as the first or last time unit when receiving the PBCH and / or PDCCH and / or PDSCH carrying the resource configuration of the RS dedicated to beam management, or the first or last time unit of the PDCCH that schedules the PDSCH carrying the resource configuration of the RS dedicated to beam management;

[0236] - frequency domain resource configuration information of the RS, such as frequency domain starting location, including frequency domain starting location determined according to a frequency domain unit gap value from a frequency domain reference point, the frequency domain reference point may be an absolute frequency domain reference point, for example, a specified point A (with absolute frequency domain value indication) or a specified frequency domain point (the frequency domain starting point of a bandwidth, BWP, etc.), or may be a frequency domain reference point of a related signal, such as the first or last frequency domain unit when receiving the PBCH and / or PDCCH and / or PDSCH carrying the resource configuration of the RS dedicated to beam management, or the first or last frequency domain unit of the PDCCH scheduling the PDSCH carrying the resource configuration of the RS dedicated to beam management;

[0237] - a time domain periodicity size of the RS;

[0238] ◆ the first beam, the second beam, and the third beam are multiple beams with an association relationship. In an implementation, the first beam is a sum beam, and the second beam and the third beam are differential beams; in an implementation, the beam coefficients of the second beam and the third beam are determined based on the beam coefficient of the first beam; in the description of this disclosure, "beam coefficient" may be replaced by "parameters of spatial filter", " vector or matrix for beam precoding", etc.; in an implementation, the boresight directions of the second beam and the third beam are determined based on the boresight direction of the first beam. For example, the boresight directions of the second beam and the third beam have an offset angle or angle deviation value from the boresight direction of the first beam, and the offset angle may be preconfigured or predefined, or may also be informed through configuration information or dynamic signaling; in this way, the angle value of the second beam may be directly obtained through the angle deviation value and the angle of the first beam, which is simple and convenient and does not require complex calculations;

[0239] ■ the UE performs the procedure of receiving a gDRS, which may include one or more of the following:

[0240] ◆ the UE receives configuration information related to gDRS reception, the configuration information may include one or more of the following:

[0241] ▶ the number of repetitions (in time domain and / or frequency domain) in the signal structure of the gDRS, which may also include time domain unit and / or frequency domain unit gap value(s) between repetitions;

[0242] ▶ mapping relationship between the ratio of received signal measured values associated with the gDRS and the angle deviation value (or angle adjustment value), where

[0243] - the received signal ratio includes a ratio of a received signal measured value (received signal value 1) of the received first beam signal to a received signal measured value (received signal value 2) of the received second beam signal, for example, received signal ratio 12 = received signal value 1 / received signal value 2, or may also include the ratio of the received signal measured value of the first beam signal to the received signal measured value of the received third beam signal (received signal 3), for example, signal ratio13 = received signal value 1 / received signal value 3;

[0244] - the angle deviation value (or angle adjustment value) includes an angle deviation value from a reference direction, the reference direction may be the boresight direction of the first beam, or a specific direction indicated by the base station;

[0245] - the mapping relationship includes a mapping relationship between the received signal ratios and the angle deviation values (or angle adjustment values), such as a one-to-one mapping relationship, or a mapping relationship between a received signal ratio range and the angle deviation values or angle adjustment values. For example, one said angle deviation value (or angle adjustment value) may be obtained through one said received signal ratio; vice versa;

[0246] ▶ boresight directions corresponding to individual beams in the possible beam set corresponding to the gDRS, for example, the boresight directions corresponding to multiple beams used to transmit the gDRS, for example, one beam index corresponds to one boresight direction;

[0247] ▶ indication that the first beam mode of gDRS (described below with differential beamforming (DBF) as an example of the first beam mode) is enabled, through which the UE may determine whether the base station has enabled the mode of transmitting gDRS with DBF, so that the UE determines that a measured feedback value corresponding to DBF is to obtain by receiving gDRS;

[0248] ▶ configuration information of a measurement window, including time domain starting point of the measurement window, the time unit length in time domain, and the periodicity size in time domain;

[0249] ▶ a type of the measured feedback value;

[0250] ▶ information on granularity of the measured feedback value;

[0251] ▶ resource configuration information for measured feedback value reporting,

[0252] ◆ the UE receives and measures the gDRS and obtains the measured feedback value corresponding to DBF; comprising one or more of:

[0253] ▶ the UE receives the gDRS signal using the same receive beam

[0254] ▶ the UE receives the gDRS signal using multiple receive beams, and there is an associated relationship between the multiple receive beams. In an implementation, the multiple receive beams include a sum beam and at least one differential beam; for example, the gDRS signal includes 5 repetitions of a sequence or signal, the first 3 repetitions are transmitted by the network device using the first beam, and the last two repetitions are transmitted by the network device using the second and third beams respectively. The UE may use the first, second and third beams to receive the first 3 repetitions respectively. For the last two repetitions, the UE may use the first beam to receive, or may also use the second or third beam to receive, or may also use the second, third beams to receive a repetition, respectively, etc.;

[0255] ▶ wherein the measured feedback value corresponding to DBF includes a combination of one or more of:

[0256] - a received signal measured value (received signal value), which may be a reference signal received power value (RSRP), and / or a reference signal received path power (RSRPP); when RSRPP is the received signal measured value, the path may be the first path in time domain, the first path with a power amplitude greater than (not less than) a certain threshold in time domain, or the path with the largest power amplitude in time domain; for convenience of description, the index of the above path in the sampling path set is labeled as the selected path index i;

[0257] - a ratio of received signals; as described above, the received signal ratio may include a ratio of a received signal measured value (received signal value 1) of the received first beam signal to a received signal measured value (received signal value 2) of the received second beam signal, e.g., received signal ratio 12 = received signal value 1 / received signal value 2, or may also include the ratio of the received signal measured value of the first beam signal to the received signal measured value of the received third beam signal (received signal 3), for example, signal ratio13 = received signal value 1 / received signal value 3. In an implementation, when the RSRPP of a path is selected for the ratio, the received signals of path obtained by receiving each beam signal are all for the same selected path index; the selected path index may be obtained by receiving the signal of the first beam, and then based on the selected path, obtaining the RSRPP value of a path with the corresponding path index receiving the signal of the second beam and / or the third beam, to calculate the ratio, for example received signal ratio = RSRPPi1 / RSRPPi2 or received signal ratio 13 = RSRPPi1 / RSRPPi3;

[0258] - an angle deviation value (or angle adjustment value); as mentioned above, the angle deviation value (or angle adjustment value) may include an angle deviation value from a reference direction, and the reference direction may be the boresight direction of the first beam or a specific direction indicated by the base station;

[0259] - a desired beam index; for example, the UE feeds back the desired beam index inferred based on the measurement results, which may include, for example: based on the obtained angle deviation value, the boresight direction corresponding to the current beam index and the boresight directions corresponding to other beam indexes, the UE may determine the desired beam index, for example, the UE may infer that the boresight direction of another beam index is closer to signal reception by the UE. For example, the boresight direction of the current beam index (expressed as beam index 1) is 30 degrees, and the boresight directions of the other two beam indexes (beam index 0 and beam index 2) are 24 degrees and 36 degrees respectively, and the angle deviation value obtained by measurement is +5 degrees, so the UE infers that 35 degrees is the best transmit beam direction of the UE, and the UE may use beam index 2 as the desired beam index;

[0260] ●the UE transmits uplink signal(s) based on the received gDRS to inform the network device of the measured feedback value, and the uplink signal(s) may include uplink signal(s) based on sequence transmission or uplink signal(s) based on data transmission. For example, the operation may include one or more of the following:

[0261] ◆ when the uplink signal is based on sequence transmission, taking the uplink signal being PRACH as an example, PRACH resources (including PRACH time-frequency resources, PRACH occasions (POs), or PRACH sequences) may be grouped, and each group corresponds to one or a group of measured feedback value(s), the UE determines the corresponding PRACH resource group based on the obtained measured feedback value, and selects or determines the PRACH resource from the obtained PRACH resource group for PRACH transmission; in this way, the UE may inform the network device of the measured feedback value through the selected resource for transmitting PRACH;

[0262] ◆ when the uplink signal is based on data transmission, such as PUCCH and / or PUSCH, the UE transmits the obtained measured feedback value to the network device using the corresponding resources of PUCCH and / or PUSCH; wherein,

[0263] ▶ the corresponding resources of PUCCH and / or PUSCH (including time-frequency resources, and / or DMRS resources) may be pre-configured, or obtained by the UE through the configuration information of the network device;

[0264] ▶ in an implementation, the PUSCH may be an msg3 PUSCH,

[0265] ▶ in an implementation, the PUCCH may be the PUCCH transmitted after msg4

[0266] ▶ in an implementation, the measured feedback value may be transmitted over UCI on PUSCH;

[0267] ▶ in an implementation, the measured feedback value may be carried through MAC CE;

[0268] ●the UE transmits the gURS using DBF, comprising at least one of the following:

[0269] ■ the UE determines whether to perform DBF-based gURS transmission based on certain trigger conditions, including at least one of the following:

[0270] ◆ the UE receives an indication of whether the base station enables DBF, and the indication may include at least one of the following:

[0271] ▶ explicit indication, using 1-bit for informing;

[0272] ▶ implicit indication, for example, if the corresponding gURS resource configuration information is configured, DBF is enabled; if the corresponding gURS resource configuration information is not configured, DBF is not enabled;

[0273] ◆ the UE determines whether the conditions for using DBF are met, for example, in at least one of the following cases, the UE meets the state and condition for using DBF, otherwise the UE does not;

[0274] ▶ UE capability to support and / or enable DBF transmission, and / or;

[0275] ▶ the number of uplink transmit beams supported by the UE is greater than or not less than a certain threshold.

[0276] ■ when the UE receives an indication that the base station enables DBF and / or the UE meets the state and condition for using DBF, the UE enables DBF-based transmission and selects the corresponding gURS resource, which may include a combination of one or more of the following:

[0277] ◆ receiving configuration information corresponding to DBF, where the configuration information includes information related to gURS, for example, information related to format of gURS, information related to transmission resource of gURS, information related to transmit power of gURS, etc.;

[0278] ◆ determining the format of the gURS signal corresponding to DBF, and the format of the gURS signal may involve that the gURS includes multiple signals and / or sequences, the multiple signals may be different signals or multiple repetitions of a signal, and the multiple sequences may be multiple different sequences, or multiple repetitions of a sequence. For convenience of description, in the description of the present disclosure, multiple signals and / or sequences are described as multiple repetitions of a signal and / or sequence, but this is only exemplary, and the principles and essence described in the present disclosure may cover various possible specific embodiments in which the gURS signal includes multiple signals and / or sequences. For example, the manner in which the gURS signal includes multiple repetitions of a signal described below may also be replaced by including multiple signals, and the manner in which the gURS signal includes multiple repetitions of a sequence may also be replaced by including multiple different sequences. The following description will take the example that the gURS signal includes multiple repetitions of a signal and / or sequence, and the signal format of the gURS may include at least one of the following:

[0279] ▶ the signal format of gURS contains N repetitions of a sequence; taking PRACH as an example of gURS, the format of a PRACH preamble contains N repetitions of a sequence, as shown in FIG. 14, for example, when N = 3, in (a), three sequences are arranged continuously, and sequence repetitions 0, 1, and 2 are transmitted using the first beam, the second beam, and the third beam respectively; preferably, as shown in the example in (b) of the figure, there may be a time gap value GAP between sequence repetitions, where GAP0, GAP1, and GAP2 may be the same as CP or configured separately; wherein GAP2 may be absent; in an implementation,

[0280] - if the number of sequence repetitions N' in the configured signal format for PRACH transmission is greater than N, the UE may perform one or more of the following

[0281] √ discarding the last N'-N sequence repetitions, e.g., not transmitting the last N'-N sequence repetitions, or treating the last N'-N sequence repetitions as a time domain gap;

[0282] √ transmitting the last N'-N sequence repetitions using the second beam and / or the third beam, considering that the second beam and the third beam may have a lower beam gain than the first beam, such operation enables to transmit the second beam and the third beam repeatedly with lower overhead, which is beneficial to signal reception;

[0283] √ transmitting the last N'-N sequence repetitions using the first beam, which is beneficial to maximizing the transmission of repetitions and beams, which is suitable for users with limited coverage;

[0284] √ the N'-N may be replaced by one or a part of N'-N sequence repetitions;

[0285] ▶ N repetitions of signal and / or M repetitions of sequence for the gURS, e.g., determining a set of signals of the gURS; in an implementation, for example, the signal format of a gURS includes M sequence repetitions (M may be 1, or a positive integer greater than 1), and repeating the gURS N times, which comprises selecting N gURS occasions as the format of the corresponding gURS signal; as illustrated in FIG. 15, M = 2, N = 3, where transmissions in one gURS occasion use the same beam, and different gURS occasions use multiple beams that are associated with each other for transmission; in an implementation,

[0286] - when the configured number of repetitions N' of the signal for PRACH transmission is greater than N, the UE may perform one or more of the following

[0287] √ discarding the last N'-N repetitions of signal, e.g., not transmitting the last N'-N repetitions of signal, or treating the last N'-N repetitions of signal as a time domain gap;

[0288] √ transmitting the last N'-N repetitions of signal using the second beam and / or the third beam, considering that the second beam and the third beam may have a lower beam gain than the first beam, such operation enables to transmit the second beam and the third beam repeatedly with lower overhead, which is beneficial to signal reception;

[0289] √ transmitting the last N'-N repetitions of signal using the first beam, which is beneficial to maximizing the transmission of repetitions and beams, and is suitable for users with limited coverage;

[0290] √ the N'-N may be replaced by one or a part of N'-N signal repetitions;

[0291] ◆ In an implementation, if the base station also uses DBF for reception, then for different signal formats of the gURS, the behaviors of the UE transmitting the gURS and the base station receiving the gURS may include at least one of the following:

[0292] ▶ As shown in the example of FIG. 15, for the case where the signal format of the gURS involves N repetitions of the gURS signal (for example, N = 3) and the signal format of one gURS includes M sequence repetitions (M may be 1, or a positive integer greater than 1), repeating the gURS N times, comprises selecting N gURS occasions as the format of the corresponding gURS signal; the transmission in a gURS occasion uses the same beam, and the network device may receive a gURS occasion through the first beam, the second beam and / or the third beam respectively;

[0293] ▶ For the case where the signal format of the gURS involves the signal format of one gURS containing N sequence repetitions, where N is greater than the number of associated beams N1 involved in DBF reception, and the N1 beams include, for example, the first beam as the sum beam and other beams as differential beams, then for the first N1 sequence repetitions, the UE uses the first beam among the associated beams to transmit, and the network device uses N1 associated beams to receive the N1 sequence repetitions respectively; for the last N-N1 sequence repetitions, the UE uses the remaining beams among the associated beams to transmit, and the base station uses the first beam or other beams among the associated beams to receive. For example, FIG. 16 shows an example in the case where N = 5＼N1 = 3, for the first 3 sequence repetitions, the UE uses the first beam to transmit, and the network device uses the first beam, the second beam, and the third beam to receive the 3 sequence repetitions respectively, and for the last 2 sequence repetitions, the UE uses the second beam and / or the third beam to transmit, and the base station uses the first beam to receive, so that at one gURS signal reception, the network device (such as base station BS) can use differential beams to receive signals transmitted by the same beam to obtain the optimal receiving direction, and can also use the same beam to receive differentially transmitted signals to obtain the optimal transmitting direction;

[0294] ◆ determining a resource to transmit the gURS, comprising one or more of:

[0295] ▶ when there is dedicated gURS resources allocated to enable DBF transmission, and when the UE receives an indication that the base station enables DBF and / or the UE meets the state and condition of using DBF, the UE selects a gURS resource from the dedicated gURS resources for enabling DBF transmission to transmit;

[0296] ▶ when multiple available gURS resources are available, randomly selecting one to transmit with equal probability;

[0297] ■ performing gURS transmission at the selected gURS resource, comprising a combination of one or more of

[0298] ◆ determination of beam coefficients, comprising a combination of one or more of:

[0299] ▶ determining beam coefficients (e.g., denoted W1) of the first beam, determining beam coefficients (denoted W2and W3) of the second beam and / or the third beam from the beam coefficients of the first beam, or the beam coefficients of the second beam and / or the third beam are associated with the beam coefficients of the first beam;

[0300] ▶ In an implementation, the first beam may be a sum beam, and the second beam and the third beam may be differential beams. The beam coefficients of the first beam (for example, may be expressed as W1or Wsum) is of a format, such as Wsum= [Wc1, Wc2,... WcY] = [WTr1, WTr2,... WTrX]T, X, Y are respectively the numbers of antenna elements of the antenna array in two dimensions; UTstands for transpose operation on U; among them, the beam coefficients Wc1, Wc2,... WcYand WTr1, WTr2,... WTrXrespectively represent the column vector and row vector of the beam coefficient matrix, and the specific design and selection thereof are not limited;

[0301] ▶ determining the beam coefficients of the second beam (which may also be expressed as a differential beam) and the third beam (which may also be expressed as a differential beam) (expressed as Wdiff1and Wdiff2) based on the beam coefficients of the first beam, and the second beam and the third beam may be differential beams in different dimensions, such as a differential beam in the horizontal direction and a differential beam in the vertical direction; for example:

[0302] - the second beam may be obtained based on the beam coefficients of the first beam, for example, Wdiff1=[Wc1, Wc2, ..., WcY / 2, -Wc(Y / 2+1), -Wc(Y / 2+2), ..., ..., WcY]; and / or

[0303] - the third beam may be obtained based on the beam coefficients of the first beam, for example, Wdiff2=[WTr1, WTr2, ..., WTrX / 2, -WTr(X / 2+1), -WTr(X / 2+2), ..., WTrX];

[0304] ▶ In an implementation, the boresight direction angle 2 and the boresight direction angle 3 of the second beam and the third beam may be set according to a certain angle deviation based on the boresight direction angle 1 of W1, thereby designing the beam coefficients corresponding to the boresight direction angle 2 and the boresight direction angle 3;

[0305] ◆ determination of transmit power, comprising at least one of:

[0306] ▶ for multiple beams used to transmit gURS signals, the UE uses the same transmit power to transmit gURS signals. In this way, the base station may directly calculate the ratio of received values of signals after receiving the gURS signals;

[0307] ▶ if the UE uses power P1 to transmit the gURS signal of the first beam, then the UE uses power P2 to transmit the gURS signal of the second beam, where P2 = P1 + P_delta, and the P_delta is a preset or network configured power difference. In an implementation, P_delta is determined based on whether DBF is supported; for example, if DBF is not supported or not enabled, P_delta = 0; in this way, the problem of reduced beam gain of differential beams may be compensated for and coverage loss may be compensated for;

[0308] ● the network device detects and receives the gURS transmitted by the UE, and the UE receives the feedback measured result from the network device, for example, comprising a combination of one or more of the following:

[0309] ■ the network device uses the same beam to receive gURS and obtain the corresponding measured feedback result,

[0310] ■ the network device uses the first beam, the second beam and / or the third beam to receive the gURS and obtain the corresponding measured feedback result;

[0311] ■ the measured feedback result may include a combination of at least one or more of the following:

[0312] ◆ a received signal measured value (received signal value), which may be a reference signal received power value (RSRP), and / or a reference signal received path power (RSRPP); when RSRPP is the received signal measured value, the path may be the first path in time domain, the first path with a power amplitude greater than (not less than) a certain threshold in time domain, or the path with the largest power amplitude in time domain; the index of the above path in the sampling path set is labeled as the selected path index i;

[0313] ◆ a ratio of received signals; which is as mentioned above, and will not be described again. In an implementation, when the path RSRPP is selected for ratio, the path received signals obtained by receiving each beam signal are all for the same selected path index; the selected path index may be obtained by receiving the signal of the first beam, and then based on the selected path, obtaining the RSRPP value of a path with the corresponding path index receiving the signal of the second beam and / or the third beam, to calculate the ratio, for example received signal ratio12= RSRPPi 1 / RSRPPi 2 or received signal ratio13= RSRPPi 1 / RSRPPi 3;

[0314] ◆ an angle deviation value (or angle adjustment value); the angle deviation value (or angle adjustment value) includes an angle deviation value from a reference direction, where the reference direction is the boresight direction of the first beam, may also be a specific direction indicated by the base station; which is as described above, and not repeated here;

[0315] ◆ a desired beam index; for example, the UE receives the desired beam index fed back by the network device which is inferred based on the measurement results, which may include: based on the obtained angle deviation value, the boresight direction corresponding to the current beam index and the boresight directions corresponding to other beam indexes, the network device may infer that the boresight direction of another beam index is closer to the signal reception by the UE. For example, the boresight direction of the current beam index (expressed as beam index 1) is 30 degrees, and the boresight directions of the other two beam indexes (beam index 0 and beam index 2) are 24 degrees and 36 degrees respectively, and the angle deviation value obtained by measurement is +5 degrees, for example, 35 degrees is the best transmit beam direction of the UE. At this time, beam index 2 is the desired beam index; then the network device feeds back beam index 2 to the UE, and the UE performs subsequent uplink signal transmission according to beam index 2.

[0316] According to an embodiment of the present disclosure, a network device may transmit a reference signal having multiple signals and / or sequences using multiple beams associated in a first beam mode, the UE may receive the reference signal having multiple signals and / or sequences using the same beam or multiple beams associated in a first beam mode, obtain measured values and information related to beam for system access (e.g., initial access) and transmit corresponding feedback information to the network device. Through such method, the base station and / or UE may obtain beams for communication during the access process quickly and with low overhead.

[0317] In addition, in an implementation, the UE may use multiple beams associated in the first beam mode to transmit uplink reference signal (for example, preamble or PRACH, or SRS, etc.) having multiple signals and / or sequences, the network device may receive the uplink reference signal using the same beam or using multiple beams associated in the first beam mode, obtain measured values and information related to beam for system access (e.g., initial access), thereby achieving obtaining beams for communication during the system access quickly and with low overhead. Through this method, the base station and / or UE may obtain beams for communication quickly and with low overhead.

[0318] Furthermore, in an implementation, the network device may transmit reference signal having multiple signals and / or sequences using multiple beams associated in the first beam mode, the UE may receive the reference signal having multiple signals and / or sequences using the same beam or multiple beams associated in the first beam mode, obtain measured values and information related to beam for system access (e.g., initial access) and feedback the information related to beam to the network device, the UE may also use multiple beams associated in the first beam mode to transmit uplink reference signal (for example, preamble or PRACH, or SRS, etc.) having multiple signals and / or sequences, the network device may receive the uplink reference signal using the same beam or using multiple beams associated in the first beam mode, obtain measured values and information related to beam for system access (e.g., initial access). Through such method, the base station and / or UE may obtain beams for communication quickly and with low overhead in system access (e.g., initial access).

[0319] FIG. 17 shows a schematic structural diagram of a user equipment 1700 according to at least one embodiment of the present disclosure. Referring to FIG. 17, the user equipment 1700 includes a transceiver 1701 and a controller 1702. The transceiver 1701 is configured to transmit data or signals and to receive data or signals. The controller 1702 is coupled with the transceiver 1701 and configured to perform control such that the user equipment 1700 performs a method according to an embodiment of the present disclosure. In an implementation, the user equipment 1700 may also include a memory (not shown) on which computer-executable instructions are stored. When the instructions are executed by the controller 1702, the user equipment 1700 may perform at least one method corresponding to the above-mentioned embodiments of the present disclosure.

[0320] FIG. 18 shows a schematic structural diagram of a base station 1800 according to at least one embodiment of the present disclosure. Referring to FIG. 18, the base station 1800 includes a transceiver 1801 and a controller 1802. The transceiver 1801 is configured to transmit data or signals and to receive data or signals. The controller 1802 is coupled with the transceiver 1801 and configured to perform control such that the base station 1800 performs a method according to an embodiment of the present disclosure. In an implementation, the base station 1800 may also include a memory (not shown), on which computer-executable instructions are stored. When the instructions are executed by the controller 1802, the base station 1800 may perform at least one method corresponding to the above embodiments of the present disclosure.

[0321] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0322] Those skilled in the art will appreciate that the present invention includes reference to devices for performing one or more of the operations described herein. These devices may be specially designed and manufactured for the required purposes, or they may comprise known devices found in general purpose computers. These devices have computer programs stored therein that are selectively activated or reconfigured. Such a computer program may be stored in a device (e.g., computer) readable medium including, but not limited to, any type of disk including floppy disks, hard disks, optical disks, CD-ROMs, and magnetic-optical disks, 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 that stores or transmits information in a form readable by a device (e.g., a computer).

[0323] It will be understood by those skilled in the art that each block of the structural diagrams and / or block diagrams and / or flow diagrams, and combinations of blocks in the structural diagrams and / or block diagrams and / or flow diagrams, may be implemented by computer program instructions. Those skilled in the art may understand that these computer program instructions may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing method for implementation, so that the scheme specified in the structural diagrams and / or block diagrams and / or flow diagrams disclosed in the present invention may be executed by the processor of the computer or other programmable data processing method.

[0324] Those skilled in the art may understand that the steps, measures, and solutions in the various operations, methods, and processes that have been discussed in the present invention may be alternated, changed, combined, or deleted. Furthermore, other steps, measures, and solutions in the various operations, methods, and processes that have been discussed in the present invention may also be alternated, changed, rearranged, decomposed, combined, or deleted. Furthermore, the steps, measures, and solutions in the various operations, methods, and processes disclosed in the present invention in the prior art may also be alternated, changed, rearranged, decomposed, combined, or deleted.

[0325] The above are only some embodiments of the present invention. It should be noted that those of ordinary skill in the art may also make several improvements and modifications without departing from the principles of the present invention. These improvements and modifications are also It should be regarded as the protection scope of the present invention.

Claims

1.A method performed by a user equipment (UE) in a communication system, comprising:receiving first configuration information related to a first beam mode, wherein the first beam mode is related to multiple beams, the first configuration information including information indicating whether the first beam mode is enabled and information related to a downlink reference signal;in case the information indicating whether the first beam mode is enabled indicates enabled, receiving the downlink reference signal including multiple signals or multiple sequences based on the first configuration information,obtaining first information related to a beam for signal transmission, based on the downlink reference signal;informing a base station of the first information,wherein, the information related to the downlink reference signal includes at least one of:information related to the number of signals or sequences included in the downlink reference signal,information related to a gap between the multiple signals or multiple sequences included in the downlink reference signal, orformat information of the downlink reference signal.2.The method of claim 1, wherein the first configuration information further includes at least one of:a mapping relationship between received signal ratios associated with the downlink reference signal and angle deviation values,information related to boresight directions of multiple beams used to transmit the downlink reference signal, measurement window configuration information,information related to a type of the first information,information related to granularity of the first information, orresource configuration information for informing the first information.3.The method of claim 1, wherein the first information includes at least one of:a measured value of the downlink reference signal,a ratio of measured values of the multiple signals or multiple sequences included in the downlink reference signal,an angle deviation value, orinformation related to a desired beam,wherein the measured value is reference signal received power (RSRP) or reference signal received path power (RSRPP),wherein, the RSRPP is associated with at least one of:the first path of the downlink reference signal in time domain,the first path with a power not less than a first threshold in time domain, anda path with the largest power in time domain.4.The method of claim 1, wherein informing the base station of the first information comprises:transmitting a physical random access channel (PRACH) using a PRACH resource associated with the first information; ortransmitting the first information using an uplink resource for the first information, wherein the uplink resource is preconfigured or obtained based on the first configuration information, wherein first information is transmitted through at least one of:physical uplink shared channel (PUSCH) of message 3 in random access,physical uplink control channel (PUCCH) transmitted after message 4 in random access,uplink control information (UCI) on PUSCH, ora medium access control (MAC) - control element (CE).5.The method of claim 1, wherein the downlink reference signal is a synchronization signal physical broadcast channel block (SSB), wherein the downlink reference signal includes one of:an SSB including multiple repetitions, ora signal including multiple repetitions of an SSB.6.The method of claim 1,wherein the downlink reference signal includes demodulation reference signal (DMRS), and the multiple signals included in the downlink reference signal include one of:multiple repetitions of a channel including the DMRS, ormultiple repetitions of a DMRS symbol included in the channel,wherein the multiple sequences included in the downlink reference signal include multiple repetitions of a DMRS sequence,wherein the multiple repetitions of the DMRS symbol included in the channel include N repetitions of DMRS symbol in the channel,wherein K DMRS symbols of the N repetitions of DMRS symbol are located at K symbols at start location or end location of the channel in time domain, or the K DMRS symbols are located at K locations frequency division multiplexed at start location or end location of the channel in time domain, wherein K is smaller than N,wherein the channel includes at least one of physical broadcast channel (PBCH), physical downlink control channel (PDCCH), or physical downlink shared channel (PDSCH).7.The method of claim 1, wherein the first configuration information is received through at least one of: PBCH, system information block type 1 (SIB1) PDCCH, SIB1 PDSCH, PDCCH of message 2 in random access, or PDSCH of message 2 in random access.8.The method of claims 1, wherein the UE receives the downlink reference signal using a same beam or different beams.9.A method performed by a base station in a communication system, comprising:transmitting first configuration information related to a first beam mode, wherein the first beam mode is related to multiple beams;transmitting a downlink reference signal including multiple signals or multiple sequences based on the first configuration information;receiving, from a user equipment (UE), first information related to a beam for signal transmission;wherein the first configuration information includes information related to the downlink reference signal.10.The method of claim 9, wherein the first information includes at least one of:a measured value of the downlink reference signal,a ratio of measured values of the multiple signals or multiple sequences included in the downlink reference signal,an angle deviation value, orinformation related to a desired beam,wherein the measured value is reference signal received power (RSRP) or reference signal received path power (RSRPP),wherein, the RSRPP is associated with at least one of:the first path of the downlink reference signal in time domain,the first path with a power not less than a first threshold in time domain, anda path with the largest power in time domain.11.The method of claim 9, wherein receiving first information related to a beam for signal transmission comprises:receiving a physical random access channel (PRACH) using a PRACH resource associated with the first information; orreceiving the first information using an uplink resource for the first information, wherein the uplink resource is preconfigured or obtained based on the first configuration information, wherein first information is received through at least one of:physical uplink shared channel (PUSCH) of message 3 in random access,physical uplink control channel (PUCCH) transmitted after message 4 in random access,uplink control information (UCI) on PUSCH, ora medium access control (MAC) - control element (CE).12.The method of claim 9,wherein the downlink reference signal includes demodulation reference signal (DMRS), and the multiple signals included in the downlink reference signal include one of:multiple repetitions of a channel including the DMRS, ormultiple repetitions of a DMRS symbol included in the channel,wherein the multiple sequences included in the downlink reference signal include multiple repetitions of a DMRS sequence,wherein the multiple repetitions of the DMRS symbol included in the channel include N repetitions of DMRS symbol in the channel,wherein K DMRS symbols of the N repetitions of DMRS symbol are located at K symbols at start location or end location of the channel in time domain, or the K DMRS symbols are located at K locations frequency division multiplexed at start location or end location of the channel in time domain, wherein K is smaller than N,wherein the channel includes at least one of physical broadcast channel (PBCH), physical downlink control channel (PDCCH), or physical downlink shared channel (PDSCH).13.A user equipment (UE) comprising:a transceiver configured to transmit or receive signals;a controller configured to control the UE to:receive first configuration information related to a first beam mode, wherein the first beam mode is related to multiple beams, the first configuration information including information indicating whether the first beam mode is enabled and information related to a downlink reference signal;in case the information indicating whether the first beam mode is enabled indicates enabled, receive the downlink reference signal including multiple signals or multiple sequences based on the first configuration information,obtain first information related to a beam for signal transmission, based on the downlink reference signal;inform a base station of the first information,wherein, the information related to the downlink reference signal includes at least one of:information related to the number of signals or sequences included in the downlink reference signal,information related to a gap between the multiple signals or multiple sequences included in the downlink reference signal, orformat information of the downlink reference signal.14.The UE of claim 13,wherein the downlink reference signal includes demodulation reference signal (DMRS), and the multiple signals included in the downlink reference signal include one of:multiple repetitions of a channel including the DMRS, ormultiple repetitions of a DMRS symbol included in the channel,wherein the multiple sequences included in the downlink reference signal include multiple repetitions of a DMRS sequence,wherein the multiple repetitions of the DMRS symbol included in the channel include N repetitions of DMRS symbol in the channel,wherein K DMRS symbols of the N repetitions of DMRS symbol are located at K symbols at start location or end location of the channel in time domain, or the K DMRS symbols are located at K locations frequency division multiplexed at start location or end location of the channel in time domain, wherein K is smaller than N,wherein the channel includes at least one of physical broadcast channel (PBCH), physical downlink control channel (PDCCH), or physical downlink shared channel (PDSCH).15.A base station, comprising:a transceiver configured to transmit or receive signals;a controller configured to control the base station to:transmit first configuration information related to a first beam mode, wherein the first beam mode is related to multiple beams;transmit a downlink reference signal including multiple signals or multiple sequences based on the first configuration information;receive, from a user equipment (UE), first information related to a beam for signal transmission;wherein the first configuration information includes information related to the downlink reference signal.

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