User equipment and base station in a communication system and methods performed thereby

Abstract

The present disclosure relates to a multi-band communication system, for example, to a 5G communication system or a 6G communication system, for supporting higher data rates than a 4G communication system such as a long term evolution (LTE). In one aspect, a method performed by a user equipment (UE) is provided, comprising: obtaining first information related to at least one second frequency band associated with a first frequency band; performing a first random access procedure on the first frequency band; and performing a second random access procedure on the second frequency band if the first random access procedure satisfies a first condition, wherein the first condition comprises at least one of: preamble identification information in a RAR received by the UE is not consistent with preamble identification information transmitted by the UE, identification information in a message 4 received by the UE is not consistent with identification information of the UE, a first time corresponding to backoff indication information received by the UE is greater than or equal to a first threshold, and a parameter value corresponding to the backoff indication information received by the UE is a non-zero value.

Description

Technical Field

[0001] This disclosure relates to the field of communications, and more specifically, to communication methods and devices in a multi-band communication system. Background Technology

[0002] Given the successive generations of wireless communication development, these technologies have primarily been developed for human-oriented services such as voice calls, multimedia services, and data services. With the commercialization of 5th-generation (5G) communication systems, the number of connected devices is expected to grow exponentially. These will increasingly connect to communication networks. Examples of the Internet of Things (IoT) can include vehicles, robots, drones, home appliances, displays, smart sensors connected to various infrastructures, construction machinery, and factory equipment. Mobile devices are expected to evolve in various forms, such as augmented reality glasses, virtual reality headsets, and holographic devices. Efforts are underway to develop improved 6G communication systems to provide a wide range of services by connecting hundreds of billions of devices and things in the sixth-generation (6G) era.

[0003] The 6G communication system, expected to be commercially available around 2030, will offer significant improvements in all aspects compared to existing 5G systems. Its peak speed will reach at least 50 Gbit / s, user experience speed will reach at least 300 Mbit / s, air interface latency will be less than 1 ms, and air interface reliability will reach 10... -5 In addition to the basic communication indicators mentioned above, 6G communication systems will also have sensing capabilities, AI-related capabilities, and better security, interoperability, and sustainability.

[0004] To achieve the aforementioned performance indicators in 6G communication systems, more advanced air interface and network technologies are needed. Currently, the evolution of extreme multiple input multiple output (MIMO) is being considered, including the use of very large-scale antenna arrays, the development and evolution of distributed antenna systems, and the design of MIMO air interface algorithms assisted by artificial intelligence (AI). This technology can achieve higher spectral efficiency, greater coverage, and more precise positioning and sensing capabilities. Furthermore, technologies that contribute to improving high-frequency coverage, such as metamaterial-based lenses and antennas, novel antenna architectures, and reconfigurable intelligence surfaces (RIS), also require further evolution and development.

[0005] To meet the new functionalities added to 6G communication systems, it is necessary to develop new technologies in areas such as network energy saving, air interface security, and network security, while also studying the feasibility of converged technologies such as integrated communication and sensing.

[0006] In addition, to improve spectrum efficiency and overall network performance, the following technologies have been developed for 6G communication systems: full-duplex technology to enable uplink and downlink transmissions to use the same frequency resources simultaneously; network technologies that utilize satellites, high-altitude platform stations (HAPS), etc., in a comprehensive manner; improved network architecture to support mobile base stations, etc., and to enable network operation optimization and automation; dynamic spectrum sharing technology based on spectrum usage prediction and conflict avoidance; the use of artificial intelligence (AI) in wireless communication to improve overall network operation by utilizing AI from the design phase of 6G development and internalizing end-to-end AI support functions; and next-generation distributed computing technologies that overcome the computing power limitations of user equipment (UE) by leveraging ultra-high-performance communication and computing resources (such as mobile edge computing (MEC), cloud, etc.) achievable on the network. Furthermore, efforts are continuing to enhance connectivity between devices, optimize networks, promote the software-defined networking of network entities, and increase the openness of wireless communications by designing new protocols to be used in 6G communication systems, developing mechanisms for achieving hardware-based secure environments and secure data use, and developing technologies for maintaining privacy.

[0007] The research and development of 6G communication systems, encompassing hyper-connectivity for both person-to-machine (P2M) and machine-to-machine (M2M) interactions, is expected to deliver the next wave of hyper-connected experiences. Specifically, services such as truly immersive extended reality (XR), high-fidelity mobile holograms, and digital replicas are anticipated to be provided through 6G communication systems. Furthermore, services such as remote surgery for enhanced security and reliability, industrial automation, and emergency response will be available via 6G communication systems, enabling the technology to be applied across a wide range of sectors including industry, healthcare, automotive, and home appliances. Summary of the Invention

[0008] According to embodiments of this disclosure, a method executed by a user equipment (UE) in a communication system is provided, comprising:

[0009] Obtain first information related to at least one second frequency band associated with the first frequency band;

[0010] The first random access procedure is performed in the first frequency band;

[0011] If the first random access procedure satisfies the first condition, then the second random access procedure is executed on the second frequency band.

[0012] The first condition includes at least one of the following: the preamble identification information in the RAR received by the UE is inconsistent with the preamble identification information sent by the UE; the identification information in message 4 received by the UE is inconsistent with the identification information of the UE; the first time corresponding to the backoff indication information received by the UE is greater than or equal to the first threshold; and the parameter value corresponding to the backoff indication information received by the UE is a non-zero value.

[0013] In one implementation, performing the second random access procedure on the second frequency band further includes at least one of the following conditions: the UE has the capability to switch to the second frequency band to perform random access, receives second information indicating to switch to the second frequency band to perform random access, and the UE determines, based on a random method, that it wants to switch to the second frequency band to perform random access.

[0014] In one implementation, the second information is received via the DCI or PDSCH corresponding to message 2 of the first random access procedure.

[0015] In one implementation, during the second random access process, the resources used for sending the preamble include at least one of the following:

[0016] Resources identified through the SSB of the second frequency band;

[0017] Resources determined based on the first information;

[0018] The same resources as the first random access procedure;

[0019] Resources determined based on resource information from the first random access procedure.

[0020] In one implementation, the first information includes at least one of the following:

[0021] Information on the time offset between the second frequency band and the first frequency band, frequency information of the second frequency band, frequency offset between the second frequency band and the first frequency band, correspondence between the number of SSBs in the second frequency band and the number of SSBs in the first frequency band, correspondence between the SSB index of the second frequency band and the SSB index of the first frequency band, correspondence between the RO of the second frequency band and the RO of the first frequency band, and correspondence between the reference signal transmission power of the second frequency band and the reference signal transmission power of the first frequency band.

[0022] In one implementation, the preamble transmission power of the second random access procedure is determined based on the second path loss and second power ramp-up parameters.

[0023] The second path loss is determined based on the path loss determined during the first random access procedure.

[0024] The initial value of the second power ramp-related parameter is determined based on the value of the power ramp-related parameter of the first random access procedure.

[0025] In one implementation, the initial value is set to be less than the value of the power ramp-up related parameters of the first random access procedure.

[0026] In one implementation, performing a second random access procedure on the second frequency band includes:

[0027] The second random access procedure is performed on the second frequency band before the first time corresponding to the backoff instruction information.

[0028] In one implementation, the method further includes: if the UE fails to access the network successfully during the second random access process within the first time period corresponding to the backoff indication information, then a third random access process is executed on the first frequency band.

[0029] In one implementation, the preamble transmission power of the third random access procedure is determined based on the preamble transmission power of the first random access procedure.

[0030] According to embodiments of this disclosure, a method executed by a user equipment (UE) in a communication system is provided, comprising:

[0031] Receive measurement configuration information related to at least two frequency bands and correlation information between at least two frequency bands, wherein the measurement configuration information includes measurement configuration information of a portion of the beams in each frequency band;

[0032] Obtain the measurement results of one frequency band and at least one other frequency band from the at least two frequency bands;

[0033] Send a measurement report, which includes the measurement results for the frequency band and the measurement results for the other frequency bands.

[0034] In one implementation, the measurement report further includes a second result for the frequency band obtained based on the measurement results of the other frequency bands.

[0035] In one implementation, the measurement report further includes information indicating the frequency band corresponding to the measurement result, and / or information indicating whether the measurement result was obtained through measurement.

[0036] In one implementation, the correlation information includes parameter information related to obtaining measurement results for other frequency bands based on measurement results from one of the at least two frequency bands.

[0037] According to embodiments of this disclosure, a method executed by a user equipment (UE) in a communication system is provided, comprising:

[0038] Receive correlation information between at least two frequency bands;

[0039] Obtain an uplink beam for the first frequency band of the at least two frequency bands;

[0040] The uplink beam of the second frequency band among the at least two frequency bands is determined based on the correlation.

[0041] According to embodiments of this disclosure, a method executed by a user equipment (UE) in a communication system is provided, comprising:

[0042] At least one uplink beam is transmitted to the base station in the first frequency band of at least two frequency bands;

[0043] The resource indication information on the first frequency band is received in the second frequency band of the at least two frequency bands;

[0044] The uplink beam of the second frequency band is determined based on the resource indication information.

[0045] According to embodiments of this disclosure, a method executed by a user equipment (UE) in a communication system is provided, comprising:

[0046] The first beam is reported as a candidate beam, which is obtained based on the measurement results in the second frequency band;

[0047] Measurement configuration information for multiple beams, including a first beam and a beam associated with the first beam, is received in a first frequency band, and the first frequency band and the second frequency band are associated.

[0048] Based on the measurements of the plurality of beams in the first frequency band, the measurement results of the second beam among the plurality of beams are reported.

[0049] In one implementation, the method further includes: switching to a second beam on the first frequency band to communicate with the base station.

[0050] In one implementation, the method further includes:

[0051] Receive first configuration information for beam failure recovery in the first frequency band, the first configuration information including the second beam;

[0052] If a beam failure is detected, beam failure recovery on the first frequency band is performed based on the second beam.

[0053] According to embodiments of this disclosure, a method executed by a user equipment (UE) in a communication system is provided, comprising:

[0054] The first beam is reported as a candidate beam, which is obtained based on the measurement results in the second frequency band;

[0055] Receive second configuration information for beam failure recovery in the first frequency band, the second configuration information including resource information on the second frequency band for beam failure recovery based on the first beam, the first frequency band and the second frequency band being associated;

[0056] Based on the resource information, a beam failure recovery request message for the first frequency band is sent in the second frequency band;

[0057] The base station receives beam failure recovery response information for the first frequency band in either the first or second frequency band.

[0058] According to embodiments of this disclosure, a method executed by a base station in a communication system is provided, comprising:

[0059] Send first information related to at least one second frequency band associated with the first frequency band to the user equipment (UE);

[0060] The first random access procedure of the UE is performed on the first frequency band;

[0061] The second random access procedure of the UE is executed on the second frequency band, the second random access procedure being executed by the UE after the first random access procedure satisfies the first condition.

[0062] The first condition includes at least one of the following: the preamble identification information in the RAR received by the UE is inconsistent with the preamble identification information sent by the UE; the identification information in message 4 received by the UE is inconsistent with the identification information of the UE; the first time corresponding to the backoff indication information received by the UE is greater than or equal to the first threshold; and the parameter value corresponding to the backoff indication information received by the UE is a non-zero value.

[0063] In one implementation, the second random access procedure being performed on the second frequency band further includes at least one of the following conditions: the UE has the capability to switch to the second frequency band to perform random access; second information indicating a switch to the second frequency band to perform random access is received; and the UE determines, based on a random method, that it wants to switch to the second frequency band to perform random access.

[0064] In one implementation, the second information is sent via the DCI or PDSCH corresponding to message 2 of the first random access procedure.

[0065] In one implementation, during the second random access process, the resources used for sending the preamble include at least one of the following:

[0066] Resources identified through the SSB of the second frequency band;

[0067] Resources determined based on the first information;

[0068] The same resources as the first random access procedure;

[0069] Resources determined based on resource information from the first random access procedure.

[0070] In one implementation, the first information includes at least one of the following:

[0071] Information on the time offset between the second frequency band and the first frequency band, frequency information of the second frequency band, frequency offset between the second frequency band and the first frequency band, correspondence between the number of SSBs in the second frequency band and the number of SSBs in the first frequency band, correspondence between the SSB index of the second frequency band and the SSB index of the first frequency band, correspondence between the RO of the second frequency band and the RO of the first frequency band, and correspondence between the reference signal transmission power of the second frequency band and the reference signal transmission power of the first frequency band.

[0072] In one implementation, the preamble transmission power of the second random access procedure is determined based on the second path loss and second power ramp-up parameters.

[0073] The second path loss is determined based on the path loss determined during the first random access procedure.

[0074] The initial value of the second power ramp-related parameter is determined based on the value of the power ramp-related parameter of the first random access procedure.

[0075] In one implementation, the initial value is set to be less than the value of the power ramp-up related parameters of the first random access procedure.

[0076] In one implementation,

[0077] The second random access procedure is executed on the second frequency band before the first time corresponding to the backoff instruction information.

[0078] In one implementation, the method further includes: performing a third random access procedure with the UE on a first frequency band, wherein the third random access procedure is performed within a first time period corresponding to the backoff indication information, and in the event that the UE has failed to access the network during the second random access procedure.

[0079] In one implementation, the preamble transmission power of the third random access procedure is determined based on the preamble transmission power of the first random access procedure.

[0080] According to embodiments of this disclosure, a method executed by a base station in a communication system is provided, comprising:

[0081] Send measurement configuration information related to multiple frequency bands to the user equipment (UE), wherein the measurement configuration information includes correlation information between at least two frequency bands;

[0082] The UE receives a measurement report, which includes measurement results for the frequency band and measurement results for other frequency bands.

[0083] The measurement results of the corresponding beam of the frequency band are obtained based on the measurement results of the other frequency bands.

[0084] In one implementation, the measurement report further includes a second result for the frequency band obtained based on the measurement results of the other frequency bands.

[0085] In one implementation, the measurement report further includes information indicating the frequency band corresponding to the measurement result, and / or information indicating whether the measurement result was obtained through measurement.

[0086] In one implementation, the correlation information includes parameter information related to obtaining measurement results for other frequency bands based on measurement results from one of the at least two frequency bands.

[0087] According to embodiments of this disclosure, a method executed by a base station in a communication system is provided, comprising:

[0088] Receive at least one uplink beam from the UE in the first frequency band of at least two associated frequency bands;

[0089] Measure the at least one uplink beam to determine resource indication information of the uplink beam in the first frequency band;

[0090] The resource indication information is sent to the UE via the second frequency band associated with the first frequency band in the at least two frequency bands.

[0091] According to embodiments of this disclosure, a method executed by a base station in a communication system is provided, comprising:

[0092] The user equipment (UE) receives information indicating a first beam as a candidate beam, the first beam being obtained based on measurements in a second frequency band;

[0093] Measurement configuration information for multiple beams, including a first beam and beams associated with the first beam, is transmitted to the UE in a first frequency band, wherein the first frequency band and the second frequency band are associated.

[0094] The measurement results of the second beam among the plurality of beams are received from the UE.

[0095] In one implementation, the method further includes: communicating with the UE using a second beam in the first frequency band.

[0096] In one implementation, the method further includes:

[0097] Send first configuration information for beam failure recovery in the first frequency band to the UE, the first configuration information including the second beam;

[0098] The second beam is used to perform beam failure recovery on the first frequency band in the event of a detected beam failure.

[0099] According to embodiments of this disclosure, a method executed by a base station in a communication system is provided, comprising:

[0100] The user equipment (UE) receives information indicating a first beam as a candidate beam, the first beam being obtained based on measurements in a second frequency band;

[0101] Send second configuration information for beam failure recovery in the first frequency band to the UE. The second configuration information includes resource information on the second frequency band for beam failure recovery based on the first beam. The first frequency band and the second frequency band are associated.

[0102] Receive beam failure recovery request information for the first frequency band in the second frequency band;

[0103] Send beam failure recovery response information for the first frequency band to the UE on the first frequency band or the second frequency band.

[0104] According to embodiments of this disclosure, a user equipment (UE) in a communication system is provided, comprising:

[0105] A transceiver is configured to transmit and / or receive signals;

[0106] A controller is configured to control the UE to perform the method described according to embodiments of this disclosure.

[0107] According to embodiments of this disclosure, a base station in a communication system is provided, comprising:

[0108] A transceiver is configured to transmit and / or receive signals;

[0109] The controller is configured to control the base station to perform the method described according to embodiments of the present disclosure. Attached Figure Description

[0110] To gain a more complete understanding of this disclosure and its advantages, reference is now made to the following description in conjunction with the accompanying drawings, wherein like reference numerals denote like parts:

[0111] Figure 1 An example wireless network according to an embodiment of the present disclosure is shown;

[0112] Figure 2 An example base station according to an embodiment of the present disclosure is shown;

[0113] Figure 3 An example user equipment according to an embodiment of the present disclosure is shown;

[0114] Figure 4 A schematic diagram of a random access process for a terminal according to an embodiment of the present disclosure is shown;

[0115] Figure 5 A schematic diagram of an antenna array according to an embodiment of the present disclosure is shown;

[0116] Figure 6 A schematic diagram of the configuration of the measurement beam according to an embodiment of the present disclosure is shown;

[0117] Figure 7A , 7B 7C illustrates an example structure for a terminal to report measurement results according to an embodiment of the present disclosure;

[0118] Figure 8A A schematic diagram is shown of a terminal transmitting uplink beams in two frequency bands according to an embodiment of the present disclosure;

[0119] Figure 8B A schematic diagram is shown of a terminal according to an embodiment of the present disclosure transmitting an uplink beam on only one frequency band;

[0120] Figure 9 A schematic diagram is shown showing that, according to an embodiment of the present disclosure, a terminal reports a candidate beam in frequency band 1 as a beam calculated based on beam measurement of another frequency band.

[0121] Figure 10 A schematic diagram is shown illustrating a terminal performing beam switching or beam quality monitoring according to an embodiment of the present disclosure;

[0122] Figure 11 A schematic diagram illustrates an example process of a terminal performing beam failure recovery (BFR) according to an embodiment of the present disclosure;

[0123] Figure 12 A schematic diagram is shown of another example process of a terminal performing a BFR according to an embodiment of the present disclosure;

[0124] Figure 13 A schematic diagram of the structure of a user equipment according to at least one embodiment of the present disclosure is shown;

[0125] Figure 14 A schematic diagram of the structure of a base station according to at least one embodiment of the present disclosure is shown. Detailed Implementation

[0126] Before proceeding with the following detailed description, it may be advantageous to define certain words and phrases used throughout the patent literature. The term “connection” and its derivatives refer to any direct or indirect communication between two or more elements, regardless of whether those elements are physically in contact with each other. The terms “transmit,” “receive,” and “transmit,” and their derivatives encompass both direct and indirect communication. The terms “comprise” and “include,” and their derivatives mean inclusion without limitation. The term “or” is concurrent, meaning both and / or. The phrase “associated with,” and its derivatives mean including, being included in, interconnected with, containing, being contained within, connected to or connected with, coupled to or coupled with, able to communicate with, cooperate with, intertwine, juxtapose, proximate, bound to or bound with, having, possessing attributes, having a relationship with, or having a relationship with, etc. The term “controller” means any device, system, or part thereof that controls at least one operation. Such a controller may be implemented in hardware or in a combination of hardware and software and / or firmware. The functionality associated with any particular controller, whether local or remote, can be centralized or distributed. The phrase "at least one" when used to list items means that different combinations of one or more of the listed items can be used, and it is possible that only one item in the list is needed. For example, "at least one of A, B, and C" includes any of the following combinations: A, B, C; A and B; A and C; B and C; and only A, only B, and only C. Similarly, the term "set" means one or more. Therefore, a set of items can be a single item or a set of two or more items.

[0127] Furthermore, the various functions described below can be implemented or supported by one or more computer programs, each function being formed by computer-readable program code and embodied in a computer-readable medium. The terms "application" and "program" refer to one or more computer programs, software components, instruction sets, procedures, functions, objects, classes, instances, associated data, or portions thereof suitable for implementation in appropriate computer-readable program code. The phrase "computer-readable program code" includes any type of computer code, including source code, object code, and executable code. The phrase "computer-readable medium" includes any type of medium accessible by a computer, such as read-only memory (ROM), random access memory (RAM), hard disk drive, compact disc (CD), digital video disc (DVD), or any other type of storage. "Non-transitory" computer-readable media excludes wired, wireless, optical, or other communication links that transmit transient electrical or other signals. Non-transitory computer-readable media includes media in which data can be permanently stored and media such as rewritable optical discs or erasable memory devices in which data can be stored and later rewritten.

[0128] Definitions for certain other words and phrases are provided throughout this patent document. Those skilled in the art will understand that, in many, if not the most, instances, such definitions apply to both prior and future use of the words and phrases defined in this way.

[0129] The figures and various embodiments included herein, used to illustrate the principles of this disclosure, are merely illustrative and should not be construed in any way as limiting the scope of this disclosure. Furthermore, those skilled in the art will understand that the principles of this disclosure can be implemented in any suitably arranged wireless communication system.

[0130] The following Figures 1 to 3 Various embodiments of this disclosure implemented in wireless communication systems are described. Figures 1 to 3 The description does not imply any physical or architectural limitations on the ways in which different embodiments can be implemented. Different embodiments of this disclosure can be implemented in any suitably arranged communication system.

[0131] Figure 1 An example wireless network according to an embodiment of this disclosure is shown. Figure 1 The embodiments of the wireless network shown are for illustrative purposes only. Other embodiments of the wireless network 100 may be used without departing from the scope of this disclosure.

[0132] like Figure 1As shown, the wireless network includes a base station (next generation nodeB, gNB or gNodeB) 101, gNB 102, and gNB 103. gNB 101 communicates with gNB 102 and gNB 103. gNB 101 also communicates with at least one network 130 such as the Internet, Internet Protocol (IP) networks, or other data networks.

[0133] gNB 102 provides wireless broadband access to network 130 to multiple first user equipments (UEs) within coverage area 120 of gNB 102. The multiple first UEs include UE 111, which may be located in a small business (SB); UE 112, which may be located in an enterprise (E); UE 113, which may be located in a WiFi hotspot (HS); UE 114, which may be located in a first residence (R1); UE 115, which may be located in a second residence (R2); and UE 116, which may be a mobile device (M) such as a cellular phone, wireless laptop, or wireless personal digital assistant (PDA). gNB 103 provides wireless broadband access to network 130 to multiple second UEs within coverage area 125 of gNB 103. The multiple second UEs include UE 115 and UE 116, and subscriber stations (SS, such as UEs) 117, 118, and 119. In some embodiments, one or more of gNBs 101-103 may communicate with each other and UEs 111-116 using existing wireless communication technologies, and one or more of UEs 111-119 may communicate directly with each other (e.g., UEs 117-119) using other existing or proposed wireless communication technologies.

[0134] Depending on the network type, the term "base station" or "BS" can refer to any component (or set of components) configured to provide wireless access to a network, such as a transmit point (TP), transmit-receive point (TRP), enhanced (or "evolved") base station (eNodeB or eNB), 5G base station (gNB), macro cell, femtocell, wireless fidelity (WiFi) access point (AP), or other wireless-capable devices. A base station can provide wireless access according to one or more wireless communication protocols, such as 3GPP 5G new radio (NR), Long Term Evolution (LTE), LTE-Advanced (LTE-A), high-speed packet access (HSPA), Wi-Fi 802.11a / b / g / n / ac, etc. For convenience, various names for base station type devices and functions may be used interchangeably in this patent document to refer to network infrastructure components that provide wireless access to remote terminals. Furthermore, depending on the network type, the term "User Equipment" (UE) can refer to any component such as a mobile station (MS), user station (SS), remote terminal, wireless terminal, receiving point, or user device. For convenience, various names for user equipment type devices and functions may be used interchangeably in this patent document to refer to remote wireless devices that wirelessly access the BS regardless of whether the UE is a mobile device (such as a mobile phone or smartphone) or is generally considered a fixed device (such as a desktop computer or vending machine).

[0135] The dashed lines indicate the approximate extent of coverage areas 120 and 125, which are shown as roughly circular for illustrative and explanatory purposes only. It should be clearly understood that coverage areas such as 120 and 125 associated with the gNB can have other shapes, including irregular shapes, depending on the configuration of the gNB and variations in the wireless environment associated with natural and man-made obstacles.

[0136] As described in more detail below, one or more of UEs 111-119 include circuitry, programming, or a combination thereof. In some embodiments, one or more of gNBs 101-103 include circuitry, programming, or a combination thereof.

[0137] although Figure 1 An example of a wireless network is shown, but more can be found on... Figure 1Various modifications can be made. For example, wireless network 100 can include any number of gNBs and any number of UEs in any suitable arrangement. Furthermore, gNB 101 can communicate directly with any number of UEs and provide those UEs with wireless broadband access to network 130. Similarly, each gNB 102-103 can communicate directly with network 130 and provide UEs with direct wireless broadband access to network 130. Additionally, gNBs 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.

[0138] Figure 2 An example base station according to an embodiment of the present disclosure is shown. Figure 2 The embodiment of gNB 102 shown is for illustrative purposes only, and Figure 1 gNBs 101 and 103 can have the same or similar configurations. However, gNBs come in a variety of configurations, and Figure 2 This disclosure is not intended to limit the scope to any particular implementation of gNB.

[0139] like Figure 2 As shown, gNB 102 includes multiple antennas 200a-200n, multiple radio frequency (RF) transceivers 201a-201n, transmit (TX) processing circuitry 203, and receive (RX) processing circuitry 204. gNB 102 also includes a controller / processor 205, a memory 206, and a backhaul or network interface (IF) 207.

[0140] RF transceivers 201a-201n receive incoming RF signals from antennas 200a-200n, such as signals transmitted by the UE in network 100. RF transceivers 201a-201n down-convert the incoming RF signals to generate intermediate frequency (IF) or baseband signals. The IF or baseband signal is sent to RX processing circuitry 204, which generates a processed baseband signal by filtering, decoding, and / or digitizing the baseband or IF signal. RX processing circuitry 204 sends the processed baseband signal to controller / processor 205 for further processing.

[0141] The TX processing circuit 203 receives analog or digital data (such as voice data, web data, email, or interactive video game data) from the controller / processor 205. The TX processing circuit 203 encodes, multiplexes, and / or digitizes the outgoing baseband data to generate a processed baseband or IF signal. RF transceivers 201a-201n receive the processed baseband or IF signal from the TX processing circuit 203 and up-convert the baseband or IF signal into an RF signal transmitted via antennas 201a-201n.

[0142] The controller / processor 205 may include one or more processors or other processing devices that control the overall operation of the gNB 102. For example, the controller / processor 205 may control the reception of forward channel signals and the transmission of reverse channel signals by the RF transceivers 201a-201n, the RX processing circuit 204, and the TX processing circuit 203, according to known principles. The controller / processor 205 may also support additional functions, such as more advanced wireless communication functions.

[0143] For example, the controller / processor 205 can support beamforming or directional routing operations, where signals emitted from multiple antennas 200a-200n are weighted differently to effectively redirect the emitted signals in the desired direction. Any of a variety of other functions can be supported in the gNB 102 via the controller / processor 205.

[0144] The controller / processor 205 is also capable of executing programs and other processes located in the memory 206, such as the operating system (OS). The controller / processor 205 can move data into or out of the memory 206 as needed by the executing process.

[0145] The controller / processor 205 is also connected to a backhaul or network interface 207. The backhaul or network interface 207 allows the gNB 102 to communicate with other devices or systems via a backhaul connection or over a network. Interface 207 can support communication via any suitable wired or wireless connection(s). For example, when the gNB 102 is implemented as part of a cellular communication system (such as a cellular communication system supporting 5G, LTE, or LTE-A), interface 207 can allow the gNB 102 to communicate with other gNBs via a wired or wireless backhaul connection. When the gNB 102 is implemented as an access point, interface 207 can allow the gNB 102 to communicate via a wired or wireless local area network or via a wired or wireless connection to a larger network (such as the Internet). Interface 207 includes any suitable structure that supports communication via wired or wireless connections such as Ethernet or RF transceivers.

[0146] Memory 206 is connected to controller / processor 205. A portion of memory 206 may include random access memory (RAM), and another portion of memory 206 may include flash memory or other read-only memory (ROM).

[0147] although Figure 2 An example of gNB 102 is shown, but it is possible to see more. Figure 2 Various changes can be made. For example, gNB 102 can include any number of Figure 2 Each component is shown in the diagram. As a specific example, an access point may include multiple interfaces 207, and the controller / processor 205 may support routing functionality to route data between different network addresses. As another specific example, although shown as a single instance of TX processing circuitry 203 and a single instance of RX processing circuitry 204, gNB102 may include multiple instances of each (such as one per RF transceiver). For example, Figure 2 The various components can be combined, further subdivided, or omitted, and additional components can be added as needed.

[0148] Figure 3 An example user equipment according to an embodiment of the present disclosure is shown. Figure 3 The embodiment of UE 116 shown is for illustrative purposes only, and Figure 1 UEs 111-115 and 117-119 can have the same or similar configurations. However, UEs appear in multiple configurations, and Figure 3 This disclosure is not intended to limit the scope to any particular implementation of the UE.

[0149] like Figure 3 As shown, UE 116 includes an antenna 301, a radio frequency (RF) transceiver 302, a TX processing circuit 303, a microphone 304, and a receive (RX) processing circuit 305. UE 116 also includes a speaker 306, a controller or processor 307, an input / output (I / O) interface (IF) 308, an input device 309, a touchscreen display 310, and memory 311. Memory 311 includes an OS 312 and one or more applications 313.

[0150] RF transceiver 302 receives incoming RF signals transmitted by gNB of network 100 from antenna 301. RF transceiver 302 down-converts the incoming RF signals to generate IF or baseband signals. The IF or baseband signals are sent to RX processing circuitry 305, which generates processed baseband signals by filtering, decoding, and / or digitizing the baseband or IF signals. RX processing circuitry 305 sends the processed baseband signals to speaker 306 (e.g., for voice data) or processor 307 for further processing (e.g., for web browsing data).

[0151] TX processing circuit 303 receives analog or digital voice data from microphone 304 or other outgoing baseband data (such as web data, email, or interactive video game data) from processor 307. TX processing circuit 303 encodes, multiplexes, and / or digitizes the outgoing baseband data to generate a processed baseband or IF signal. RF transceiver 302 receives the processed baseband or IF signal from TX processing circuit 303 and up-converts the baseband or IF signal into an RF signal transmitted via antenna 301.

[0152] Processor 307 may include one or more processors or other processing devices and executes OS 312 stored in memory 311 to control the overall operation of UE 116. For example, processor 307 may control the reception of forward channel signals and the transmission of reverse channel signals by RF transceiver 302, RX processing circuitry 305, and TX processing circuitry 303 according to known principles. In some embodiments, processor 307 includes at least one microprocessor or microcontroller.

[0153] Processor 307 is also capable of executing other processes and programs located in memory 311, such as processes for CSI (Channel State Information) reporting on the uplink channel. Processor 307 can move data into or out of memory 311 as needed for executing processes. In some embodiments, processor 307 is configured to execute application 313 based on OS 312 or in response to signals received from gNB or operator. Processor 307 is also coupled to I / O interface 308, which provides UE 116 with the ability to connect to other devices such as laptops and laptops. I / O interface 308 is the communication path between these accessories and processor 307.

[0154] The processor 307 is also connected to the touchscreen display 310. The user of the UE 116 can use the touchscreen display 310 to input data into the UE 116. The touchscreen display 310 can be a liquid crystal display, a light-emitting diode display, or other display capable of rendering text and / or at least limited graphics such as those from a website.

[0155] Memory 311 is connected to processor 307. A portion of memory 311 may include RAM, and another portion of memory 311 may include flash memory or other ROM.

[0156] although Figure 3 An example of UE 116 is shown, but it is possible to modify it. Figure 3 Make various changes. For example, Figure 3 The various components can be combined, further subdivided, or omitted, and additional components can be added as needed. As a specific example, processor 307 can be divided into multiple processors, such as one or more central processing units (CPUs) and one or more graphics processing units (GPUs). Moreover, although... Figure 3 The UE 116 is shown configured as a mobile phone or smartphone, but the UE can be configured to operate as other types of mobile or fixed devices.

[0157] With the rapid development of mobile communication technology, higher demands are being placed on network transmission speeds. During the deployment and development of 5G / 6G technologies, the advantages of high-frequency communication—high bandwidth, high capacity, and high speed—have been clearly demonstrated. However, it has also exposed problems such as high transmission loss, small coverage area, high power consumption, and high cost, particularly in millimeter wave and THz bands. These issues have, to some extent, limited the large-scale application of millimeter wave communication; currently, only a few countries offer services in the corresponding frequency bands.

[0158] The transmission distance of a signal is inversely proportional to its operating frequency. For the same base station transmit power and transmission distance, the higher the frequency of the transmitted signal, the greater the transmission path loss, and the weaker the signal strength received by the terminal. To achieve complete coverage of high-frequency signals in a cell, the base station transmit power or base station density can be increased. However, this leads to a sharp increase in equipment costs and base station energy consumption, becoming a major obstacle to the large-scale commercialization of high-frequency communication. Beamforming focuses the energy of the base station's transmit beam, using a narrower beam to transmit data, thereby improving the signal-to-noise ratio and achieving wider coverage and higher data transmission efficiency. For a base station antenna containing multiple antenna elements, by adjusting the phase output of each antenna element, the electromagnetic wave signals radiated by different elements can be superimposed, achieving coherent addition of beams in a specified direction and coherent subtraction in other directions, thus completing the transmission of a high-gain narrow beam in that direction.

[0159] Because each antenna has a limited radiating bandwidth, especially in the wider millimeter-wave band, typical antenna unit designs only support about 10% of the bandwidth (bandwidth / center frequency). Therefore, if a single base station wants to support a larger bandwidth, or if it needs to be compatible with both millimeter-wave and low-frequency antennas (e.g., sub-6GHz, FR3), separate antennas can be designed for each frequency band, resulting in a larger overall product size and increased hardware and installation costs. Furthermore, during a terminal's attempt to perform random access with the base station, if a large number of users send random access requests within a certain timeframe, the base station cannot respond to all requests quickly enough. In this case, the base station can send specific indications, instructing some terminals to wait a specific time before retransmitting their random access requests. The time it takes for terminals receiving these indications to access the base station increases, leading to increased communication latency.

[0160] This invention designs a multi-band communication system. When a base station supports multi-band communication, if there is a correlation between the beams of the multiple frequency bands used for communication between the base station and the terminal, the beam-related information of another frequency band can be obtained by analyzing the information of a beam in one frequency band. This correlation can be used in processes such as random access, beam management, and / or beam recovery, reducing signaling overhead, shortening latency, and improving resource utilization.

[0161] In some designs, shared antenna arrays can be used to improve antenna integration. For example, the overall size of the antenna can be reduced by adjusting the spatial distribution of antenna elements. For instance, two sets of antenna elements can be placed in the same area using an interleaved element distribution method. The two sets of antenna elements can operate at different frequencies. Two antenna arrays can be placed within the same antenna product volume, reducing the overall size and volume. This method is suitable for antenna design of base stations and / or terminals. This invention proposes a method for operating multi-band communication systems. Based on the correlation between different frequency bands, information about other unmeasured frequency bands is obtained. The correlation can be the relative spatial positions of antenna panels in multiple frequency bands, for example, the center positions of multiple frequency band antenna arrays are the same. This method can be used in processes such as initial access, beam management, and beam failure recovery, reducing measurement signaling overhead and / or latency during communication. In one aspect, this invention proposes a method for reducing user random access latency. When a terminal receives information from a base station indicating a large number of users accessing the network, in addition to continuing to wait or attempt random access on the existing frequency band, the terminal can also attempt to perform a random access procedure on a new frequency band to improve connection efficiency.

[0162] The correlation between different frequency bands can be at least one of the following: spatial correlation, frequency (band) relative correlation, or correlation of measured values. Spatial relative correlation can be used in beam correlation processes. Relative correlation of measured values ​​can be used in the processing and / or calculation of measurement results. Frequency (band) relative correlation can be used for switching and selecting between frequency bands.

[0163] In this invention, a communication system involving spatial relative relationships is used as an example for illustration, but it is not limited thereto. In this embodiment, antenna arrays of two frequency bands (frequency band 1 and frequency band 2) are used on the base station side, and their spatial positions relative to the same terminal are the same. For example, the base station and the terminal have the same transmission path in both frequency bands. Utilizing this characteristic, new cross-frequency band beamforming procedures can be designed to reduce signaling overhead.

[0164] In this invention, the invention is explained in detail through the description of frequency band 1 and frequency band 2, but it is not limited to two frequency bands; it can also be other numbers of frequency bands, such as three frequency bands. The relative relationship between frequency band 1 and frequency band 2 is not limited.

[0165] Example 1

[0166] The correlation between multiple frequency band antennas can be used to improve random access related processes.

[0167] In some embodiments, when a base station supports the function of multi-band antennas, different frequency bands can operate as independent cells. For example, a base station antenna that simultaneously supports LTE, NR, and millimeter-wave bands has independent SSB transmission in each frequency band, and the terminal can select the frequency band it connects to.

[0168] When a terminal attempts random access in a cell, if there are many terminals in that cell, the probability of random access contention failure increases. The terminal can then switch to an associated cell to perform random access. The determination of contention failure can be as follows: the terminal receives a backoff indication (e.g., a non-all-zero backoff indicator) in the random access response information sent by the base station, instructing some terminals to wait a period before retransmitting the random access request (msg1 or msgA); or, the terminal does not receive a backoff indication in the random access response information but does not receive information consistent with the terminal's identity information in msg4 or msgB.

[0169] The terminal obtains information about cells associated with a given cell (e.g., cells corresponding to frequency band 1) from the broadcast information of a specific cell. At this point, the terminal can perform random access through the associated cells of its current cell, thus accelerating the connection to the base station.

[0170] In this embodiment, combined with Figure 4 The diagram shown illustrates the related processes. The dashed lines represent optional implementation methods, the selection methods and conditions of which are illustrated below. For example... Figure 4 As shown, the method for a terminal to perform a random access procedure includes steps 401 to 406. Furthermore, depending on the specific circumstances of receiving messages 2 and 4, steps 409 or 407 to 408 may optionally be included. This step will be described in detail below.

[0171] like Figure 4 As shown, step 401 includes: the terminal obtaining associated cell information in frequency band 1. Alternatively, the terminal may also obtain associated frequency band information in frequency band 1. For ease of description, the following description uses a cell as an example of a frequency band to illustrate obtaining associated cell information. For example, the terminal receives an SSB that meets a threshold condition and reads the information contained in and / or indicated by the SSB. The information contained in and / or indicated by the SSB includes association information of multi-band antennas and / or association indication information of multi-band antennas (which may also be referred to in this disclosure as associated frequency band information or associated cell information, or associated frequency band indication information or associated cell indication information).

[0172] Optionally, the association information of the multiple frequency band antennas can be transmitted explicitly or implicitly. For example, if the terminal can obtain information about associated cells and / or indication information about associated cells from the system information, it indicates that the multiple frequency bands corresponding to this information are associated. Alternatively, this association information can be the association information of multiple different frequency band resources.

[0173] Optionally, the correlation between the multiple frequency bands can also be used in processes such as beam management and beam recovery.

[0174] Optionally, the association information of the cell information includes at least one of the following: the time offset information between the associated cell and the time of the current cell, the frequency information of the associated cell or the frequency offset information between the associated cell and the current cell, the correspondence information between the number of SSBs of the associated cell and the current cell, the correspondence information between the SSB index of the associated cell and the SSB index of the current cell, the correspondence information between the RO of the associated cell and the RO of the SSB, and the correspondence information between the reference signal transmission power of the associated cell and the reference signal transmission power of the current cell.

[0175] Optionally, some or all of the information in the cell information associated with the cell can be obtained from the system information. For example, SIB1, which is periodically broadcast by the base station.

[0176] Optionally, some or all of the information from the cell information associated with the cell can be obtained from SIBx. The terminal determines whether it needs to request and obtain this system information based on its supported bandwidth.

[0177] Step 402 includes: The terminal sending message 1 (MSG1) in frequency band 1. For example, the terminal sends a random access request (msg1 or msgA) in frequency band 1 corresponding to the SSB based on information contained and / or indicated in the SSB.

[0178] Step 403 includes: determining whether message 2 (MSG2) from the terminal has been received. For example, the terminal attempts to receive a random access request response (msg2 or msgB) sent by the base station, and determines whether to switch to the associated cell for random access based on the information contained and / or indicated therein.

[0179] On the one hand, if the result of the determination in step 403 is negative, for example, case 1: the terminal did not receive the random access response (RAR) from the base station; or case 2: the terminal received the random access response (RAR) but did not receive the RAR corresponding to the identification information (e.g., RAPID) of the preamble it sent (e.g., in this case, the terminal can obtain the backoff indication information in the RAR, because the RAR may include backoff indication information), then the terminal can execute step 407.

[0180] In step 407, the terminal determines whether it has received a backoff instruction message.

[0181] If the result of step 407 is negative, such as case 1 above, then the terminal executes step 409: continue to perform random access in frequency band 1;

[0182] If the result of the determination in step 407 is yes, such as case 2 above, then the terminal executes step 408: switch to frequency band 2 to perform random access.

[0183] On the other hand, if the result of the determination in step 403 is yes, then steps 404 to 405 are executed:

[0184] Step 404: Send message 3 (MSG3) in frequency band 1;

[0185] Step 405: Determine whether message 4 (MSG4) has been received from the terminal.

[0186] If the result of the determination in step 405 is yes, then the terminal successfully accesses the base station (step 406);

[0187] If the result of the determination in step 405 is negative, then proceed to step 408: switch to frequency band 2 to perform random access.

[0188] In the above combination Figure 4 The description uses the example of a terminal having two associated frequency bands (band 1 and band 2) as an example, but this is merely exemplary and not intended to be limiting. The method of this disclosure can also cover cases where the terminal has more associated frequency bands, such as three frequency bands, in which case the method of this disclosure can also be applied accordingly.

[0189] Furthermore, while the description in this disclosure uses a four-step random access method as an example, the principles or methods of this disclosure can also be applied to a two-step random access scenario.

[0190] Furthermore, in the following description, examples of cell frequency bands are used, hence the terms "associated cell" and similar expressions. It is understood that these expressions can also be replaced with "associated frequency band," "associated carrier," "associated frequency band," "associated BWP," etc.

[0191] Optionally, in relation to step 408 above, the process may also involve the terminal determining whether to switch to an associated frequency band or associated cell to perform random access. For example, the decision to switch to an associated cell may be made by the base station or the terminal.

[0192] Optionally, the terminal can determine whether to hand over to the associated cell by using the handover indication information of the associated cell. The handover indication information of the associated cell can be in explicit or implicit form. For example, there may be 1 bit of information in the downlink information to indicate whether the terminal can hand over to the associated cell.

[0193] Optionally, if the system information sent and / or indicated by the base station includes information about the associated cell, it can indicate that the terminal can switch to the associated cell for random access.

[0194] Optionally, the handover indication information for the associated cell can be obtained in the DCI of the PDSCH corresponding to msg2. The terminal receiving the DCI can switch to the associated cell for random access.

[0195] Optionally, the handover indication information of the associated cell can be obtained in the PDSCH corresponding to msg2. For example, it can be obtained explicitly or implicitly in the header of the MAC layer information. When the terminal receives the backoff indicator information from the random access response information sent by the base station at a time that is not 0, it indicates that the terminal can switch to the associated cell for random access.

[0196] Optionally, if the terminal does not find a RAR that matches its identity information in the received RAR, the terminal may wait for a specified time according to the time corresponding to the backoff instruction information and then re-initiate random access, or switch to a cell that is associated with the cell indicated in the system information, perform the random access related procedures, and generate a random access request.

[0197] Optionally, the terminal can determine whether to switch to the associated cell based on the indication information from the base station. For example, all terminals that have not received their corresponding RAR in msg2, and whose terminal capabilities support switching to the associated cell, must switch to the associated cell.

[0198] Optionally, the terminal can determine whether to switch to an associated cell based on its own capabilities. For example, based on the frequency information of the associated cell, the terminal can determine whether it supports signal transmission, reception, and signal processing functions in this frequency band, and then determine whether to switch to the associated cell for random access.

[0199] Optionally, when the terminal supports communication on the associated cell frequency, the terminal may randomly decide whether to switch to the associated cell.

[0200] Optionally, the terminal determines whether to switch to the associated cell based on a comparison between the waiting time in the received backoff indication information and a specified threshold. For example, if the waiting time is greater than a specified threshold 1, the terminal switches to the associated cell; if it is less than a specified threshold 2, it remains in the original cell waiting to resend the random access request; if the waiting time is greater than a specified threshold 2 and less than threshold 1, the terminal randomly determines whether to switch to the associated cell. The threshold 1 and / or threshold 2 can be sent by the base station or stored in advance in the terminal's storage unit.

[0201] Optionally, threshold 1 and threshold 2 can be the same.

[0202] • (Optional) The terminal sends a random access request (msg1 or msgA) on the resources corresponding to the associated cell based on the obtained associated cell information. The time-frequency resources used for sending can be obtained from the system information.

[0203] Optionally, some information in the time-frequency resource information used to transmit msg1 in frequency band 2 can be obtained from the associated cell information.

[0204] Optionally, the terminal may assume that some of the time-frequency resource information used in transmitting msg1 in frequency band 2 is the same as that in frequency band 1, or may assume that there is a correlation and that the information in frequency band 1 can be used to calculate it.

[0205] Optionally, the terminal may perform SSB measurement and / or reading in frequency band 2 to obtain partial information from the time-frequency resource information used to transmit msg1 in frequency band 2.

[0206] Optionally, if the frequencies of frequency band 1 and frequency band 2 differ significantly, the antenna gain required to achieve the same cell coverage will be different. Therefore, the number of SSBs in frequency band 2 corresponding to each SSB in frequency band 1 may be one or more.

[0207] Optionally, if the number of SSBs in frequency band 2 corresponding to each SSB in frequency band 1 may be one, the terminal can directly use the SSB and related parameters corresponding to frequency band 2 to perform a random access procedure.

[0208] Optionally, if the number of SSBs in frequency band 2 corresponding to each SSB in frequency band 1 may be multiple, the terminal may select one of the multiple SSBs to perform a random access procedure. The method for selecting one of the multiple SSBs may be at least one of the following: the terminal selects randomly; the terminal measures the multiple SSBs in frequency band 2 and selects based on a comparison of the measurement results of the multiple SSBs.

[0209] Optionally, after switching to band 2, the transmission power of terminal msg1 is related to the transmission power of band 1. For example, if the terminal does not need to receive SSBs in band 2 to measure the path loss, the path loss value of band 2 can be determined based on the path loss of band 1 by using the correlation between the two bands. Combining the correlation information of SSBs of the two bands obtained from the system information (e.g., the base station's target power, preambleReceivedTargetPower), the power value when transmitting the preamble in band 2 can be determined.

[0210] Optionally, the terminal can have two independent sets of power ramp-up adjustment parameters in band 1 and band 2.

[0211] Optionally, when the terminal switches to band 2, the power ramp-up adjustment parameters of its band 1 may not be reset to their initial values.

[0212] Optionally, the initial values ​​of the power ramp-up adjustment related parameters used by the terminal in frequency band 2 can be the relevant values ​​of the power ramp-up adjustment related parameters in frequency band 1. The power ramp-up adjustment related parameters include at least one of the following: power ramp-up step (PREAMBLE_POWER_RAMPING_STEP), power ramp-up counter (PREAMBLE_POWER_RAMPING_COUNTER), and power ramp-up value (PREAMBLE_POWER_RAMPING_STEP*(PREAMBLE_POWER_RAMPING_COUNTER-1)).

[0213] Optionally, to reduce interference to other terminals, the initial values ​​of the power ramp-up adjustment parameters used in frequency band 2 can be lower than the values ​​of the power ramp-up adjustment parameters in frequency band 1. For example, PREAMBLE_POWER_RAMPING_COUNTER in frequency band 2 = PREAMBLE_POWER_RAMPING_COUNTER in frequency band 1 / 2.

[0214] • After the terminal sends msg1 in frequency band 2, it attempts to receive the base station's random access response information (MSG2) in the designated frequency band.

[0215] Optionally, the terminal may attempt to receive msg2 on the same frequency band as msg1. For example, if the terminal sends a preamble on frequency band 2, the terminal needs to receive the corresponding random access response information on frequency band 2.

[0216] Optionally, the terminal receives MSG2 in a designated frequency band according to the indication information sent by the base station. For example, the terminal receives the frequency band indication information from the base station in MSG2 or MSG4. The frequency band indication information indicates the frequency band information used by the terminal in subsequent information transmission. For example, msg2 indicates the frequency domain resource location used by the terminal to send msg3 and / or receive msg4.

[0217] • (Optional) If the terminal fails to successfully complete random access in band 2 before the time included in the backoff indication information, the terminal may return to band 1 to continue attempting random access.

[0218] Optionally, the random access parameters of the terminal in band 1 do not need to be reset when switching to band 2. For example, the backoff timer (PREAMBLE_BACKOFF) continues to operate to determine when the terminal switches back to the original band 1.

[0219] Optionally, the terminal can have multiple sets of random access related parameters in multiple frequency bands.

[0220] • (Optional) If the terminal receives a backoff instruction message during MSG2, and there is a RAR corresponding to or identical to the identification information of the preamble used by the terminal, then the terminal does not need to wait for the specified time to retransmit the preamble. However, if the terminal fails to compete for the preamble during MSG4, for example, by not receiving MSG4 that matches the terminal identity information (RNTI), then the terminal can switch to frequency band 2 for random access, or reselect the preamble in frequency band 1 to perform a random process. The related processes and judgment conditions are similar to the descriptions related to message 2 above, and will not be repeated here.

[0221] Optionally, the terminal can randomly decide whether to switch to the associated cell.

[0222] Example 2

[0223] The relationships between multiple frequency band antennas can be used to simplify beam management processes.

[0224] In this embodiment, the antenna element arrays of multiple frequency bands have spatial relationships. For example, their antenna element arrays are designed with a shared array surface, such as... Figure 5 As shown. The antennas for the two frequency bands are represented by circles and squares, respectively. The multi-frequency band can be at least two frequency bands, and the relative relationship between the different frequency bands can be at least one of the following: inclusion, same, no frequency overlap, and partial frequency overlap.

[0225] Optionally, the spacing between units in each frequency band can be the same, for example, half the wavelength of the center frequency of a certain frequency band. For example, the center frequency can be the average of the maximum and minimum values ​​of its operating frequency band.

[0226] Based on the relative relationships of antenna arrays in different frequency bands, information about another related frequency band can be obtained (or estimated, predicted) using information acquired in one frequency band. For example, by configuring a terminal to perform measurements in frequency band 1, the power information of the beam received by the terminal (e.g., RSRP, Reference Signal Receiving Power) can be obtained. Combining this with the frequency information, spatial relative position information, and transmit power difference information of the two frequency bands, the power information (RSRP) of the corresponding beam in frequency band 2 can be estimated.

[0227] In some embodiments, if the base station antenna is Figure 5 The antenna design shown is configured with frequency band 1 ( Figure 5 The measurement of multiple beams (e.g., measured power value information, RSRP) of the structure shown in the middle circle, combined with the measurement results of the beams in the adjacent directions of frequency band 2, yields the intensity information of the beams in frequency band 2 in the directions corresponding to the multiple beams in frequency band 1.

[0228] Figure 6 A schematic diagram of the configuration of the measurement beam according to an embodiment of the present disclosure is shown, wherein it is assumed that the antennas of frequency band 1 and frequency band 2 are associated, for example, they can be used Figure 5 The structure shown. (As illustrated) Figure 6 As shown, the measurement beams of the two frequency bands are staggered. The antenna panels of frequency band 1 and frequency band 2 have the same relative spatial position to the terminal, for example, the signal transmission paths are the same (e.g., when both are direct paths, they have the same LOS path). Beam strength information in multiple beam directions of a frequency band can be calculated by measuring a portion of the beams in one frequency band and combining it with measurements of a portion of the beams in the other frequency band. Based on the frequency relationship (e.g., frequency correlation) between frequency band 1 and frequency band 2, and substituted into the path loss calculation model, the path loss value of frequency band 2 can be determined from the path loss measurement value of frequency band 1. If the relationship between the transmit power of the two array antennas is known (e.g., the transmit power difference is known (e.g., the transmit power is the same)), the path loss value of frequency band 2 can be obtained. Figure 5The beam strength information corresponds to the beams in the same direction (as shown in the square structure). Furthermore, multiple beam strength comparisons are performed on frequency band 2 and frequency band 1 respectively to determine and / or report information corresponding to a limited number of beams. The multiple beam strength information used for comparison includes actual measured values ​​for the current frequency band and / or values ​​calculated based on measured values ​​from other frequency bands. For example, measurements of a first beam set can be configured on frequency band 1, and measurements of a second beam set of frequency band 2 can be configured on frequency band 2. The first beam set and the second beam set are different; the first beam set is a portion of all beams in frequency band 1 from which measurement results are desired, and the second beam set is a portion of all beam sets in frequency band 2 from which measurement results are desired. In one embodiment, the first beam set and the second beam set constitute all or most of the beams from which measurement results are desired for frequency band 1 or frequency band 2.

[0229] For example in Figure 6 In the diagram shown, all beams in frequency band 1 are beams 1-6, and all beams in frequency band 2 are beams 1-6. During measurement, beams 1, 3, and 5 are configured for measurement in frequency band 1, and beams 2, 4, and 6 are configured for measurement in frequency band 2. Due to the correlation between frequency bands 1 and 2, information such as the signal strength of beams 2, 4, and 6 in frequency band 1 can be obtained based on the measurement results of beams 2, 4, and 6 in frequency band 2 (referred to as calculated or estimated values). Therefore, by configuring the measurement of beams 1, 3, and 5 in frequency band 1, results related to the signal strength of beams 1, 2, 3, 4, 5, and 6 in frequency band 1 can be obtained. The results for some beams are obtained from the actual measurement of frequency band 1, while the results for the other beams are obtained based on the measurement results of other frequency points.

[0230] Based on this Figure 6 The method described in the illustrated embodiment, the relevant processes executed on the terminal side are as follows:

[0231] • The terminal connects to and / or communicates with base stations that support multiple frequency bands.

[0232] Optionally, the multiple frequency bands can be the Pcell, Scell, PScell, and SPcell of the base station.

[0233] Optionally, the multiple frequency bands can be multiple cells of a base station. Each cell can operate independently and has its own independent SSB.

[0234] Optionally, the multiple frequency bands can be multiple carriers of base station carrier aggregation (CA).

[0235] • The terminal receives at least one set of measurement configuration information sent by the base station.

[0236] Optionally, the at least one set of measurement configuration information can be the configuration information of a resource set, which contains multiple resources. These multiple resources correspond to measurement resources in multiple frequency bands.

[0237] Optionally, the at least one set of measurement configuration information can be configuration information for multiple resource sets, each resource set containing a set of measurement resources. These multiple resource sets correspond to measurement resources in multiple frequency bands.

[0238] Optionally, the measurement configuration information may be CSI-RS measurement configuration information (CSI-MeasConfig). The measurement configuration information includes measurement resource information (CSI-ResourceConfig) and / or measurement result reporting information (CSI-ReportConfig). The measurement resource information includes at least one of the following: measurement resource type (CSI-RS, IM, SSB), measurement resource information, measurement type (periodic, aperiodic, semi-periodic), and the association relationship of measurement resources. The measurement reporting information includes at least one of the following: reporting type, reporting quantity, reporting type (periodic, aperiodic, semi-periodic), and the number of reports.

[0239] Optionally, the correlation of the measurement resources can be used to indicate the correlation between multiple frequency bands. For example, it can be used to indicate whether the measurement value of at least one frequency band can be calculated from the measurement value of another frequency band.

[0240] Optionally, the correlation information of the measurement resources may also include parameter information and / or parameter indication information required for the calculation. For example, the coefficient for road loss conversion in different frequency bands.

[0241] Optionally, the association of the measurement resources can be obtained from other signaling. For example, the base station's broadcast information SSB (or MIB, SIB), the PDCCH (or DCI) for resource scheduling and / or indication, and the PDSCH containing data information.

[0242] Optionally, the report quantity can be at least one of the following: RSRP, RSRQ, SINR, CQI, RI, PMI.

[0243] Optionally, the number of reports can be at least one of the following: the top N largest power values ​​and their corresponding resource indices (N is a positive integer) in each frequency band measurement; each resource index and its corresponding measurement value configured in each frequency band; the measurement and calculation values ​​and their corresponding resource indices configured in each frequency band; the top N largest power values ​​and their corresponding resource indices (N is a positive integer) in each frequency band measurement and calculation values.

[0244] The terminal performs beam measurement based on the received configuration information.

[0245] • (Optional) The terminal calculates beam information for multiple frequency bands based on the measurement results.

[0246] The terminal measures partial beams in two frequency bands and combines this with the correlation information between the two frequency bands to obtain beam information that was not measured in either band. Because the measured beams in the two frequency bands are spatially interleaved, the terminal can measure the beam in band 1 and combine this with the measurement values ​​of the beam in band 2 in the adjacent direction to obtain the measurement value of the virtual beam in band 2 in the direction corresponding to the beam in band 1.

[0247] Optionally, the calculation method can be based on AI to improve the accuracy of the results.

[0248] The terminal reports the measurement results based on the configuration information.

[0249] Optionally, the terminal may report additional indication information. This indication information is used to distinguish whether the reported power value and / or corresponding resource index is obtained based on calculation or measurement. Alternatively, it may indicate whether the reported information is used in the beam management process of band 1 or band 2.

[0250] like Figure 7A , 7B As shown in Figure 7C, the form of terminal reporting can be determined by the base station or by the terminal itself. For example... Figure 7A The structure shown indicates that the base station instructs the terminal on the reporting format. The terminal only needs to report the measured value and the calculated estimated value at designated locations. Optionally, identification information can be included at designated locations in the reported content to distinguish the reporting results. For example, 0 / 1 can be used to identify whether the reported content is a measured value or a calculated value. Alternatively, the base station can configure the corresponding terminal reporting format based on the configuration information of measurement resources, such as virtual beams (beams on a certain frequency band that are not configured for measurement, for example, ...). Figure 6 The calculation of beam strength information (beams 2, 4, and 6 in the measurement band are referred to as virtual beams of frequency band 1) is performed by the base station. The terminal only reports the measurement results obtained from the beams in the measurement band, and does not report the calculated results of other beams. The structure of the content reported by the terminal is as follows: Figure 7B and Figure 7C As shown. In Figure 7B In the identifier, the first bit is used to distinguish the frequency band corresponding to the data (frequency band 1 or frequency band 2), and the second bit is used to indicate the corresponding reference signal identification information. Figure 7C In this process, the terminal only needs to report the corresponding two sets of measurement results based on the two sets of measurement resource information.

[0251] The information reported by the terminal is used to determine the beam used by the terminal, and / or the candidate beams of the terminal.

[0252] Using the described method, a terminal can measure N resources (or beams) on one frequency band and obtain M measurement results. Here, M and N are positive integers, and M > N. Compared to configuring two sets of beam measurements in two separate frequency bands, this method reduces the number of beams measured, shortens measurement time, and reduces signaling overhead. Furthermore, compared to estimation algorithms that transmit N beams in only one frequency band and perform beam interpolation to obtain M equivalent beams, this method references the measurement information of the MN beams in frequency band 2, resulting in higher accuracy.

[0253] Similarly, if the terminal supports beamforming, the beam used by the terminal can also be obtained through the aforementioned correlation. For example, by measuring partial beams across multiple frequency bands, the beam information used by the terminal in a specific frequency band can be obtained (similar to...). Figure 6 (as shown in the method), or, instructing the terminal to use the beam determined by frequency band 2 when communicating in frequency band 1.

[0254] Optionally, the beam indication method can be implemented by indicating resources. For example, a terminal uses multiple beams in a frequency band to transmit uplink information on different resources. Based on the resources corresponding to the preferred beams measured and indicated by the base station, the terminal can determine the uplink beam corresponding to a specific frequency band. Here, the specific frequency band can be the frequency band where the terminal transmits the multiple uplink beams, and / or, the associated frequency band of the frequency band where the terminal transmits the multiple uplink beams.

[0255] In some embodiments, the terminal may report beamforming-related capability information, such as the number of supported beams. The terminal then performs beam management procedures on the terminal side based on the base station's configuration information.

[0256] Optionally, the beam management can be determined through uplink beam transmission and measurement. Based on the base station's configuration information, the terminal transmits beams in different directions and obtains beam indication information from the base station. The beam indication information is determined based on the multiple uplink beams transmitted by the terminal.

[0257] In this invention, the multiple uplink beams transmitted by the terminal can be beams of different frequency bands, such as... Figure 8AAs shown. The terminal supports switching of beams in four directions and transmits through beams in two frequency bands to determine the communication beams for each frequency band.

[0258] Optionally, if beams in different frequency bands are correlated, the terminal can transmit the uplink beam only in one frequency band. For example... Figure 8B As shown, the terminal performs beam management only within frequency band 1, and the measurement results within frequency band 1 can be directly used for frequency band 2. The terminal can receive resource indication information (e.g., SRI, SRS resource indicator) to determine the beam it uses in frequency band 2. Here, the resource indication information is the resource indication information for frequency band 1. In this way, the base station indicates the resource indication information for one frequency band, and the beams on other frequency bands of the terminal can also be determined based on this resource indication information. In this way, the terminal does not need to perform beam management separately in multiple frequency bands to obtain uplink beams, or the burden of performing beam management in multiple frequency bands can be reduced.

[0259] Optionally, the association indication information can be used to indicate the association relationship between two frequency bands. When the terminal receives the association indication information, the terminal assumes that the relevant information for beam management within the two frequency bands associated with this indication information can be mutually converted. For example, the beams on the terminal side and the base station side can be obtained through calculation, and / or their reference signals can be shared after processing, and / or their measured values ​​can be compared after calculation.

[0260] Optionally, the association indication information can be obtained in at least one of the following ways: broadcast channel or broadcast channel indication information (SSB, MIB, SIB), downlink control channel PDCCH (DCI), downlink data channel (PDSCH), and higher layer signaling (RRC signaling, MAC layer signaling).

[0261] Example 3

[0262] In one embodiment, the correlation between multiple frequency bands can also be used to assist beam recovery.

[0263] For example, for those with Figure 5 The system with the antenna design shown can assist in beam recovery and reduce signaling overhead through information exchange between two frequency band antennas.

[0264] In some embodiments, the terminal can be configured to perform periodic beam measurements (e.g., CSI-RS beam measurements) to monitor transmission quality during information transmission and determine candidate beams. When the terminal's transmitted information quality meets specified conditions, rapid beam recovery is achieved by switching to a candidate beam. Figure 5In the antenna design system shown, the periodic beam measurement and monitoring of the terminal can be based on the measurement of beams in two frequency bands. In one embodiment, the periodic beam measurement and monitoring of the terminal can be based on the measurement of a portion of the beams in each of the two frequency bands. If the candidate beam of the terminal in frequency band 1 is obtained based on the beam measurement calculation in frequency band 2, such as... Figure 9 As shown, beams 1, 3, and 5 of frequency band 1 are configured for measurement, but candidate beams of frequency band 1 (e.g., Figure 9 The beam shown (4) is calculated or estimated based on the measurement results of beam 4 in frequency band 2.

[0265] According to embodiments of this disclosure, a terminal may receive new measurement configuration information in frequency band 1, the new measurement configuration information including candidate beams (e.g., Figure 9 The measurement configuration information for beam 4) in the image. The related process is as follows: Figure 10 As shown, the terminal performs measurements including candidate beams based on the new measurement configuration information to determine whether communication quality can be ensured by switching to the candidate beams.

[0266] Optionally, the new measurement configuration information may include at least one beam associated with a candidate beam. For example, N beams that are close to the direction of the candidate beam.

[0267] Optionally, the new measurement can be a non-periodic or half-periodic measurement.

[0268] Optionally, the terminal can determine candidate beams with higher gain and higher data transmission efficiency based on the measurements of the multiple beams.

[0269] If, in a new measurement, the measurement value (e.g., RSRP) reported by the terminal based on the new measurement configuration information is greater than the original measurement value of the beam used for communication between the terminal and the base station, the terminal's communication beam can be switched to a candidate beam. In this method, the terminal can switch to a candidate beam without meeting the beam failure condition, thus improving the quality of data transmission.

[0270] Optionally, the terminal can determine whether to request a switch to a candidate beam based on a comparison of the measurement results.

[0271] Optionally, the terminal may only report the measurement results of the original connection beam and the candidate beam, and the base station may decide whether to switch to the candidate beam.

[0272] In some cases, the terminal and the base station continue to use the existing beam for communication in band 1, without switching to the candidate beam. The base station will update the configuration parameters (e.g., BFR config) for beam failure recovery (BFR) based on the candidate beam, and the new parameters include the candidate beam reported by the terminal.

[0273] When a terminal detects a beam failure, it executes a beam failure recovery process using new configuration parameters. If, after detecting a beam failure, the measured value corresponding to a candidate beam meets a threshold requirement, the terminal can use the updated information associated with the candidate beam to perform beam recovery. This process includes sending a beam failure recovery request using a preamble associated with the candidate beam.

[0274] In some cases, after reporting at least one candidate beam obtained from measurements based on frequency band 2, the terminal may not receive any measurement and / or beam failure recovery information based on the new candidate beam in frequency band 1. In this situation, the terminal can receive beam failure recovery configuration information from the base station in frequency band 1. This configuration information includes configuration parameters for candidate beam recovery in frequency band 2. For example, the base station may reserve beam failure recovery resources related to the candidate beam only for the terminal in frequency band 2. If the terminal detects a beam failure, it can restore the beam quality in frequency band 1 using the beam failure recovery resources in frequency band 2.

[0275] like Figure 11 As shown, after the terminal reports the measurement results of the candidate beams, it can receive at least one set of beam failure recovery configuration information. Specifically, if the candidate beams reported by the terminal include beams in frequency band 2, the terminal can also receive beam failure recovery configuration information for frequency band 2.

[0276] Optionally, the terminal can receive two sets of beam failure recovery configuration information from frequency band 1 and frequency band 2 respectively.

[0277] Optionally, the beam failure recovery configuration information of frequency band 2 can be sent from the frequency band 2 cell base station to the frequency band 1 cell base station through inter-cell information exchange, and then sent from the frequency band 1 cell base station to the terminal.

[0278] Optionally, the beam failure recovery configuration information for frequency band 2 can be obtained directly from the cell base station of frequency band 2.

[0279] Based on the received beam failure recovery configuration information, the base station determines the available beams for beam failure recovery and sends a beam recovery request (BFR request) on the corresponding base station reserved resources. For example, when the terminal measures an available candidate beam in frequency band 2, the terminal sends a beam recovery request through the reserved resources of frequency band 2. The terminal then attempts to receive the base station's response information.

[0280] Optionally, the terminal may attempt to receive beam recovery response information from the base station in frequency band 1. At this time, the cell base station in frequency band 2 receives the beam failure recovery request sent by the terminal and sends the terminal-related information to the terminal's connected cell in frequency band 1 through inter-cell information exchange.

[0281] Optionally, the terminal may attempt to receive beam recovery response information from the base station in frequency band 2, such as... Figure 12 As shown. At this time, the cell base station in band 2 receives the beam failure recovery request sent by the terminal and sends response information to the terminal in band 2. Simultaneously, the cell base station in band 2 sends candidate beam-related information to the terminal's connected cell band 1 through inter-cell information exchange, restoring communication between the terminal and band 1.

[0282] Figure 13 A schematic diagram of the structure of a user equipment 1300 according to at least one embodiment of the present disclosure is shown. (Reference) Figure 13 The user equipment 1300 includes a transceiver 1301 and a controller 1302. The transceiver 1301 is configured to transmit data or signals and receive data or signals. The controller 1302 is coupled to the transceiver 1301 and configured to perform control to cause the user equipment 1300 to perform methods according to embodiments of the present disclosure. In one implementation, the user equipment 1300 may further include a memory (not shown) storing computer-executable instructions that, when executed by the controller 1302, allow the user equipment 1300 to perform at least one method corresponding to the above embodiments of the present disclosure.

[0283] Figure 14 A schematic diagram of the structure of a base station 1400 according to at least one embodiment of the present disclosure is shown. (Reference) Figure 14 The base station 1400 includes a transceiver 1401 and a controller 1402. The transceiver 1401 is configured to transmit data or signals and receive data or signals. The controller 1402 is coupled to the transceiver 1401 and configured to perform control such that the base station 1400 performs methods according to embodiments of the present disclosure. In one implementation, the base station 1400 may further include a memory (not shown) storing computer-executable instructions that, when executed by the controller 1402, allow the base station 1400 to perform at least one method corresponding to the above embodiments of the present disclosure.

[0284] The above description is merely an example 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 within the scope of protection of the present invention.

[0285] Those skilled in the art will understand that this invention includes devices for performing one or more of the operations described in this application. These devices may be specifically designed and manufactured for the desired purpose, or may include known devices found in general-purpose computers. These devices have computer programs stored therein that can be selectively activated or reconfigured. Such computer programs may be stored in a device (e.g., a computer)-readable medium or in any type of medium suitable for storing electronic instructions and coupled to a bus, including but not limited to any type of disk (including floppy disks, hard disks, optical disks, CD-ROMs, and magneto-optical disks), ROM (Read-Only Memory), RAM (Random Access Memory), EPROM (Erasable Programmable Read-Only Memory), EEPROM (Electrically Erasable Programmable Read-Only Memory), flash memory, magnetic cards, or optical cards. That is, a readable medium includes any medium by which a device (e.g., a computer) stores or transmits information in a readable form.

[0286] Those skilled in the art will understand that each block in these structural diagrams and / or block diagrams and / or flow diagrams, as well as combinations of blocks in these structural diagrams and / or block diagrams and / or flow diagrams, can be implemented using computer program instructions. Those skilled in the art will also understand that these computer program instructions can be provided to a processor of a general-purpose computer, a specialized computer, or other programmable data processing method for implementation, thereby enabling the processor of the computer or other programmable data processing method to execute the schemes specified in the blocks or plurality of blocks of the structural diagrams and / or block diagrams and / or flow diagrams disclosed herein.

[0287] Those skilled in the art will understand that the steps, measures, and schemes in the various operations, methods, and processes discussed in this invention can be alternated, modified, combined, or deleted. Furthermore, other steps, measures, and schemes in the various operations, methods, and processes discussed in this invention can also be alternated, modified, rearranged, decomposed, combined, or deleted. Furthermore, steps, measures, and schemes in the prior art that are similar to those disclosed in this invention can also be alternated, modified, rearranged, decomposed, combined, or deleted.

[0288] The above description is only a partial embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method executed by a user equipment (UE) in a communication system, comprising: Obtain first information related to at least one second frequency band associated with the first frequency band; The first random access procedure is performed in the first frequency band; If the first random access procedure satisfies the first condition, then the second random access procedure is executed on the second frequency band. The first condition includes at least one of the following: the preamble identification information in the RAR received by the UE is inconsistent with the preamble identification information sent by the UE; the identification information in message 4 received by the UE is inconsistent with the identification information of the UE; the first time corresponding to the backoff indication information received by the UE is greater than or equal to the first threshold; and the parameter value corresponding to the backoff indication information received by the UE is a non-zero value.

2. The method according to claim 1, wherein, Performing the second random access procedure on the second frequency band further includes at least one of the following conditions: the UE has the capability to switch to the second frequency band to perform random access, receives second information indicating to switch to the second frequency band to perform random access, and the UE determines to switch to the second frequency band to perform random access based on a random method.

3. The method according to claim 2, wherein, The second information is received via the DCI or PDSCH corresponding to message 2 of the first random access procedure.

4. The method according to any one of claims 1-3, wherein, During the second random access process, the resources used to send the preamble include at least one of the following: Resources identified through the SSB of the second frequency band; Resources determined based on the first information; The same resources as the first random access procedure; Resources determined based on resource information from the first random access procedure.

5. The method according to any one of claims 1-4, wherein, The first information includes at least one of the following: Information on the time offset between the second frequency band and the first frequency band, frequency information of the second frequency band, frequency offset between the second frequency band and the first frequency band, correspondence between the number of SSBs in the second frequency band and the number of SSBs in the first frequency band, correspondence between the SSB index of the second frequency band and the SSB index of the first frequency band, correspondence between the RO of the second frequency band and the RO of the first frequency band, and correspondence between the reference signal transmission power of the second frequency band and the reference signal transmission power of the first frequency band.

6. The method according to any one of claims 1-5, wherein, The preamble transmission power of the second random access procedure is determined based on the second path loss and the second power ramp-up parameters. The second path loss is determined based on the path loss determined during the first random access procedure. The initial value of the second power ramp-related parameter is determined based on the value of the power ramp-related parameter of the first random access procedure.

7. The method according to claim 6, wherein, The initial value is set to be less than the value of the power ramp-up related parameters of the first random access procedure.

8. The method according to any one of claims 1-7, wherein, Performing a second random access procedure on the second frequency band includes: The second random access procedure is performed on the second frequency band before the first time corresponding to the backoff instruction information.

9. The method according to claim 8, further comprising: If the UE fails to access the network during the second random access procedure within the first time period corresponding to the backoff indication information, then the third random access procedure is executed on the first frequency band.

10. The method according to claim 9, wherein, The preamble transmission power of the third random access procedure is determined based on the preamble transmission power of the first random access procedure.

11. A method performed by a base station in a communication system, comprising: Send first information related to at least one second frequency band associated with the first frequency band to the user equipment (UE); The first random access procedure of the UE is performed on the first frequency band; The second random access procedure of the UE is executed on the second frequency band, the second random access procedure being executed by the UE after the first random access procedure satisfies the first condition. The first condition includes at least one of the following: the preamble identification information in the RAR received by the UE is inconsistent with the preamble identification information sent by the UE; the identification information in message 4 received by the UE is inconsistent with the identification information of the UE; the first time corresponding to the backoff indication information received by the UE is greater than or equal to the first threshold; and the parameter value corresponding to the backoff indication information received by the UE is a non-zero value.

12. A user equipment (UE) in a communication system, comprising: A transceiver is configured to transmit and / or receive signals; The controller is configured to control the UE to perform the method according to any one of claims 1-10.

13. A base station in a communication system, comprising: A transceiver is configured to transmit and / or receive signals; The controller is configured to control the base station to perform the method according to claim 11.

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