Communication method, communication device, storage medium, and program product

Abstract

Provided in embodiments of the present disclosure are a communication method, a communication device, a storage medium, and a program product. The method is executed by a network device. The method comprises: sending first information to a terminal, wherein the first information is used for indicating a first cell associated with a secondary cell (SCell) or a downlink (DL) carrier associated with the SCell, and a first random access message sent by the network device on the first cell or the DL carrier is used for the terminal to perform random access to the SCell. In the embodiments of the present disclosure, the terminal can reliably perform random access to the SCell.

Description

Communication methods, communication equipment, storage media and software products Technical Field

[0001] This disclosure relates to the field of communication technology, and in particular to a communication method, communication device, storage medium, and program product. Background Technology

[0002] In the field of communication technology, the carrier of wireless communication includes uplink (UP) carrier and downlink (DL) carrier. Summary of the Invention

[0003] How a terminal performs a random access procedure to access a secondary cell (SCell) is a question that needs to be considered.

[0004] According to a first aspect of the present disclosure, a communication method is proposed, performed by a network device, the method comprising: sending first information to a terminal; wherein the first information is used to indicate a first cell associated with an SCell or a DL carrier associated with an SCell, and a first random access message sent by the network device on the first cell or the DL carrier is used for the terminal to randomly access the SCell.

[0005] According to a second aspect of the present disclosure, a communication method is proposed, executed by a terminal, the method comprising: receiving first information sent by a network device, the first information being used to indicate a first cell associated with an SCell or a DL carrier associated with an SCell, and a first random access message sent by the network device on the first cell or the DL carrier for the terminal to randomly access the SCell.

[0006] According to a third aspect of the embodiments of this disclosure, a communication device is provided for performing the communication method of the first aspect or the second aspect.

[0007] According to a fourth aspect of the present disclosure, a storage medium is provided that stores instructions that, when executed on a communication device, cause the communication device to perform the method as described in an optional implementation of the first or second aspect.

[0008] According to a fifth aspect of the present disclosure, a program product is provided, comprising a computer program or instructions that, when executed by a processor, implement the method as described in the optional implementations of the first or second aspect.

[0009] In this embodiment of the disclosure, the terminal can reliably perform random access to SCell. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings required for the description of the embodiments are introduced below. The following drawings are only some embodiments of this disclosure and do not impose specific limitations on the protection scope of this disclosure.

[0011] Figure 1 is a schematic diagram of the structure of an information processing system according to an embodiment of the present disclosure.

[0012] Figure 2A is an interactive schematic diagram of a communication method according to an embodiment of the present disclosure.

[0013] Figure 3A is an interactive schematic diagram of a communication method according to an embodiment of the present disclosure.

[0014] Figure 3B is an interactive schematic diagram of a communication method according to an embodiment of the present disclosure.

[0015] Figure 4A is a schematic diagram illustrating a wireless communication according to an embodiment of the present disclosure.

[0016] Figure 5A is a schematic diagram of the structure of a terminal according to an embodiment of the present disclosure.

[0017] Figure 5B is a schematic diagram of the structure of a network device according to an embodiment of the present disclosure.

[0018] Figure 6A is a schematic diagram of the structure of a communication device provided according to an embodiment of the present disclosure.

[0019] Figure 6B is a schematic diagram of the structure of a chip provided according to an embodiment of the present disclosure. Detailed Implementation

[0020] This disclosure provides a communication method, communication device, network device, terminal, communication system, storage medium, and program product.

[0021] In a first aspect, embodiments of this disclosure propose a communication method executed by a network device, the method comprising: sending first information to a terminal; wherein the first information is used to indicate a first cell associated with an SCell or a DL carrier associated with an SCell, and a first random access message sent by the network device on the first cell or the DL carrier is used by the terminal to randomly access the SCell.

[0022] In the above embodiments, after receiving the first information sent by the network device, the terminal can determine the first cell associated with the SCell or the DL carrier associated with the SCell. When performing random access to the SCell, the terminal can receive the first random access message for accessing the SCell on the first cell or DL ​​carrier indicated by the first information, thereby reliably accessing the SCell.

[0023] In conjunction with some embodiments of the first aspect, in some embodiments, the SCell is configured with a UL carrier and the SCell is not configured with a DL carrier, or the SCell is configured with both a UL carrier and a DL carrier, and the number of UL carriers is greater than or equal to the number of DL carriers.

[0024] In the above embodiments, SCell can be flexibly configured with UL carriers and DL carriers, making the configuration method more flexible.

[0025] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes: sending second information to the terminal; wherein the second information is used to indicate random access resources, the random access resources are used by the terminal to send a second random access message, and the second random access message is used by the terminal to randomly access SCell.

[0026] In the above embodiments, after receiving the second information, the terminal can send a second random access message based on the random access resources indicated by the second information, thereby reliably accessing the SCell based on the network indication.

[0027] In conjunction with some embodiments of the first aspect, in some embodiments, the second information is used to indicate at least one of the following: random access channel occasion (RO) resources for accessing the SCell; preamble resources for accessing the SCell; and a mapping relationship between RO resources and synchronization signal / pbch block (SSB), wherein the SSB is an SSB transmitted in the first cell or an SSB transmitted on the DL carrier.

[0028] In the above embodiments, after receiving the second information, the terminal can reliably access SCell based on RO resources, preamble resources and / or mapping relationships according to the network's instructions.

[0029] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes: sending third information to the terminal; wherein the third information is used to indicate an offset value, the offset value being used to compensate for uplink path loss of the terminal in the SCell.

[0030] In the above embodiments, the network can indicate the offset value through third information, thereby compensating for the uplink path loss of the terminal in the SCell, making the path loss more consistent with the actual situation.

[0031] In conjunction with some embodiments of the first aspect, in some embodiments, the method further includes: determining the radio access network temporary identifier (RA-RNTI) of the SCell based on the index of the SCell.

[0032] In the above embodiments, the index of the SCell can be used to determine the RA-RNTI of the SCell, so that the RA-RNTI can be adapted to the SCell.

[0033] Secondly, embodiments of this disclosure propose a communication method executed by a terminal, the method comprising: receiving first information sent by a network device, the first information being used to indicate a first cell associated with an SCell or a DL carrier associated with an SCell, and a first random access message sent by the network device on the first cell or the DL carrier for the terminal to randomly access the SCell.

[0034] In conjunction with some embodiments of the first aspect, in some embodiments, the SCell is configured with a UL carrier and the SCell is not configured with a DL carrier, or the SCell is configured with both a UL carrier and a DL carrier, and the number of UL carriers is greater than or equal to the number of DL carriers.

[0035] In conjunction with some embodiments of the second aspect, in some embodiments, the method further includes: receiving second information sent by a network device; wherein the second information is used to indicate a random access resource, the random access resource is used to send a second random access message, and the second random access message is used for the terminal to randomly access SCell.

[0036] In conjunction with some embodiments of the second aspect, in some embodiments, the second information is used to indicate at least one of the following: RO resources for accessing the SCell; preamble resources for accessing the SCell; and a mapping relationship between RO resources and SSBs, wherein the SSB is an SSB transmitted in the first cell or an SSB transmitted on the DL carrier.

[0037] In conjunction with some embodiments of the second aspect, in some embodiments, the method further includes: determining the reference signal receiving power (RSRP) of the SSB, wherein the SSB is an SSB transmitted in the first cell or an SSB transmitted on the DL carrier; determining the random access resource selected by the terminal for random access to the Scell ​​based on the RSRP; and after receiving the first random access message, sending a second random access message for accessing the SCell based on the random access resource, wherein the second random access message is used for the terminal to randomly access the SCell.

[0038] In conjunction with some embodiments of the second aspect, in some embodiments, the random access resource is a RO resource and / or a preamble resource.

[0039] In conjunction with some embodiments of the second aspect, in some embodiments, the method further includes: determining the uplink path loss of the terminal in the SCell; and determining, based on the uplink path loss, the preamble set selected by the terminal for sending the second random message, wherein the preamble set is preamble set A or preamble set B.

[0040] In conjunction with some embodiments of the second aspect, in some embodiments, determining the uplink path loss of the terminal in the SCell includes: determining the uplink path loss based on the RSRP of the SSB, the transmit power of the SSB, and the offset value; wherein the offset value is used to compensate for the uplink path loss of the terminal in the SCell, and the SSB is an SSB transmitted in the first cell or an SSB transmitted on the DL carrier.

[0041] In conjunction with some embodiments of the second aspect, in some embodiments, the method further includes: receiving third information sent by a network device; wherein the third information is used to indicate an offset value.

[0042] In conjunction with some embodiments of the second aspect, in some embodiments, the method further includes: determining the RA-RNTI of the SCell based on the index of the SCell.

[0043] Thirdly, embodiments of this disclosure provide a terminal, including: a transceiver module configured to: send first information to the terminal; wherein the first information is used to indicate a first cell associated with the SCell or a DL carrier associated with the SCell, and a first random access message sent by the network device on the first cell or the DL carrier is used for the terminal to randomly access the SCell.

[0044] In conjunction with some embodiments of the third aspect, in some embodiments, the transceiver module is configured such that: the SCell is configured with a UL carrier and the SCell is not configured with a DL carrier, or the SCell is configured with both a UL carrier and a DL carrier, and the number of UL carriers is greater than or equal to the number of DL carriers.

[0045] In conjunction with some embodiments of the third aspect, in some embodiments, the transceiver module is configured to: send second information to the terminal; wherein the second information is used to indicate random access resources, the random access resources are used by the terminal to send a second random access message, and the second random access message is used by the terminal to randomly access SCell.

[0046] In conjunction with some embodiments of the third aspect, in some embodiments, the transceiver module is configured such that: the second information is used to indicate at least one of the following: RO resources for accessing the SCell; preamble resources for accessing the SCell; and a mapping relationship between RO resources and SSBs, wherein the SSB is an SSB transmitted in the first cell or an SSB transmitted on the DL carrier.

[0047] In conjunction with some embodiments of the third aspect, in some embodiments, the transceiver module is configured to: send third information to the terminal; wherein the third information is used to indicate an offset value, the offset value being used to compensate for the uplink path loss of the terminal in the SCell.

[0048] In conjunction with some embodiments of the third aspect, in some embodiments, the network device includes a processing module configured to determine the RA-RNTI of the SCell based on the index of the SCell.

[0049] Fourthly, embodiments of this disclosure provide a terminal, including: a transceiver module configured to: receive first information sent by a network device, the first information being used to indicate a first cell associated with an SCell or a DL carrier associated with an SCell, and a first random access message sent by the network device on the first cell or the DL carrier being used by the terminal to randomly access the SCell.

[0050] In conjunction with some embodiments of the fourth aspect, in some embodiments, the transceiver module is configured such that: the SCell is configured with a UL carrier and the SCell is not configured with a DL carrier, or the SCell is configured with both a UL carrier and a DL carrier, and the number of UL carriers is greater than or equal to the number of DL carriers.

[0051] In conjunction with some embodiments of the fourth aspect, in some embodiments, the transceiver module is configured to: receive second information sent by a network device; wherein the second information is used to indicate a random access resource, the random access resource is used to send a second random access message, and the second random access message is used for the terminal to randomly access the SCell.

[0052] In conjunction with some embodiments of the fourth aspect, in some embodiments, the transceiver module is configured such that: the second information is used to indicate at least one of the following: RO resources for accessing the SCell; preamble resources for accessing the SCell; and a mapping relationship between RO resources and SSBs, wherein the SSB is an SSB transmitted in the first cell or an SSB transmitted on the DL carrier.

[0053] In conjunction with some embodiments of the fourth aspect, in some embodiments, the transceiver module is configured to: determine the RSRP of an SSB, wherein the SSB is an SSB transmitted in the first cell or an SSB transmitted on a DL carrier; determine the random access resource selected by the terminal for random access to the Scell ​​based on the RSRP; and after receiving a first random access message, send a second random access message to the SCell for accessing the SCell based on the random access resource, wherein the second random access message is used for the terminal to randomly access the SCell.

[0054] In conjunction with some embodiments of the fourth aspect, in some embodiments, the transceiver module is configured such that the random access resource is a RO resource and / or a preamble resource.

[0055] In conjunction with some embodiments of the fourth aspect, in some embodiments, the terminal includes a processing module configured to: determine the uplink path loss of the terminal in the SCell; and determine, based on the uplink path loss, a preamble set selected by the terminal for sending a second random message, wherein the preamble set is preamble set A or preamble set B.

[0056] In conjunction with some embodiments of the fourth aspect, in some embodiments, the processing module is configured to: determine uplink path loss based on the RSRP of the SSB, the transmit power of the SSB, and the offset value; wherein the offset value is used to compensate for the uplink path loss of the terminal in the Scell, and the SSB is an SSB transmitted in the first cell or an SSB transmitted on the DL carrier.

[0057] In conjunction with some embodiments of the fourth aspect, in some embodiments, the transceiver module is configured to: receive third information sent by the network device; wherein the third information is used to indicate an offset value.

[0058] In conjunction with some embodiments of the fourth aspect, in some embodiments, the processing module is configured to: determine the RA-RNTI of the SCell based on the index of the SCell.

[0059] Fifthly, embodiments of this disclosure provide a communication device including one or more processors; wherein the communication device is used to perform the method as described in the embodiments or optional implementations of the first or second aspect.

[0060] In a sixth aspect, embodiments of this disclosure provide a communication device for performing the method as described in an optional implementation of the first or second aspect.

[0061] In a seventh aspect, embodiments of this disclosure provide a communication system including a network device and a terminal, wherein the network device is used to perform the method described in the optional implementation of the first aspect, and the terminal is used to perform the method described in the optional implementation of the second aspect.

[0062] Eighthly, embodiments of this disclosure provide a storage medium storing instructions that, when executed on a communication device, cause the communication device to perform the method described in the optional implementation of the first or second aspect.

[0063] In a ninth aspect, embodiments of this disclosure provide a program product comprising a computer program or instructions that, when executed by a processor, implement the method as described in the optional implementations of the first or second aspect.

[0064] In a tenth aspect, embodiments of this disclosure provide a computer program that, when run on a computer, causes the computer to perform the methods described in an optional implementation of the first or second aspect.

[0065] Eleventhly, embodiments of this disclosure provide a chip or chip system; the chip or chip system includes processing circuitry configured to perform the method described in an optional implementation of the first or second aspect above.

[0066] It is understood that the aforementioned network devices, terminals, communication devices, communication systems, storage media, program products, computer programs, chips, or chip systems are all used to execute the methods provided in the embodiments of this disclosure. Therefore, the beneficial effects they can achieve can be referred to the beneficial effects in the corresponding methods, and will not be repeated here.

[0067] This disclosure provides a communication method, a communication device, a communication system, a program product, and a storage medium. In some embodiments, the terms "communication method" and "information processing method" may be used interchangeably.

[0068] This disclosure is not exhaustive, but merely illustrative of some embodiments, and is not intended to limit the scope of protection of this disclosure. Unless otherwise specified, each step in a particular embodiment can be implemented as an independent embodiment, and the steps can be arbitrarily combined. For example, a solution after removing some steps in a particular embodiment can also be implemented as an independent embodiment, and the order of the steps in a particular embodiment can be arbitrarily interchanged. Furthermore, the optional implementation methods in a particular embodiment can be arbitrarily combined; moreover, the embodiments can be arbitrarily combined, for example, some or all steps of different embodiments can be arbitrarily combined, and a particular embodiment can be arbitrarily combined with the optional implementation methods of other embodiments. In all embodiments of this disclosure, unless otherwise specified or logically conflicting, the terminology and / or descriptions between the embodiments are consistent and can be mutually referenced. Technical features in different embodiments can be combined to form new embodiments based on their inherent logical relationships.

[0069] The terminology used in the embodiments of this disclosure is for the purpose of describing particular embodiments only and is not intended to limit the scope of this disclosure.

[0070] In this embodiment of the disclosure, unless otherwise stated, elements expressed in the singular form, such as "a," "an," "the," "the," "the," "the," "the," "the," "this," etc., can mean "one and only one," or "one or more," "at least one," etc. For example, when using articles such as "a," "an," "the," etc. in translation, the noun following the article can be understood as either a singular expression or a plural expression.

[0071] In the embodiments disclosed herein, "multiple" refers to two or more.

[0072] In some embodiments, the terms “at least one of A or B, at least one of A and B”, “one or more”, “a plurality of”, “multiple”, etc., may be used interchangeably.

[0073] In some embodiments, the notation "at least one of A and B", "A and / or B", "A in one case, B in another", "in response to one case A, in response to another case B", etc., may include the following technical solutions depending on the situation: in some embodiments, A (execute A regardless of whether there is a branch B); in some embodiments, B (execute B regardless of whether there is a branch A); in some embodiments, execution is selected from A and B (A and B are selectively executed); in some embodiments, both A and B are executed. The same applies when there are more branches such as A, B, C, etc.

[0074] In some embodiments, the notation "A or B" may include the following technical solutions, depending on the situation: in some embodiments, A (execute A regardless of whether a branch B exists); in some embodiments, B (execute B regardless of whether a branch A exists); in some embodiments, execution is selected from A and B (A and B are selectively executed). The same applies when there are more branches such as A, B, and C.

[0075] The prefixes "first," "second," etc., used in the embodiments of this disclosure are merely for distinguishing different descriptive objects and do not impose restrictions on the position, order, priority, quantity, or content of the descriptive objects. The description of the descriptive objects is found in the claims or the context of the embodiments, and the use of prefixes should not constitute unnecessary restrictions. For example, if the descriptive object is a "field," the ordinal numbers preceding "field" in "first field" and "second field" do not restrict the position or order of the "fields." "First" and "second" do not restrict whether the "fields" they modify are in the same message, nor do they restrict the order of "first field" and "second field." Similarly, if the descriptive object is a "level," the ordinal numbers preceding "level" in "first level" and "second level" do not restrict the priority between "levels." Furthermore, the number of descriptive objects is not limited by ordinal numbers and can be one or more. For example, in "first device," the number of "devices" can be one or more. Furthermore, the objects modified by different prefixes can be the same or different. For example, if the object being described is "device", then "first device" and "second device" can be the same device or different devices, and their types can be the same or different. Similarly, if the object being described is "information", then "first information" and "second information" can be the same information or different information, and their content can be the same or different.

[0076] In some embodiments, “including A,” “containing A,” “for indicating A,” and “carrying A” can be interpreted as directly carrying A or indirectly indicating A.

[0077] In some embodiments, terms such as "time / frequency" and "time-frequency domain" refer to the time domain and / or frequency domain.

[0078] In some embodiments, terms such as “in response to…”, “in response to determining…”, “in the case of…”, “when…”, “when…”, “if…”, etc. can be used interchangeably. These descriptions all refer to the device making a corresponding action under certain objective circumstances. They do not necessarily limit the time, nor do they require the device to make a judgment action when implementing it, nor do they mean that there must be other limitations.

[0079] In some embodiments, the terms “greater than,” “greater than or equal to,” “not less than,” “more than,” “more than or equal to,” “not less than,” “higher than,” “higher than or equal to,” “not lower than,” and “above” can be used interchangeably, as can the terms “less than,” “less than or equal to,” “not greater than,” “less than,” “less than or equal to,” “not more than,” “lower than,” “lower than or equal to,” “not higher than,” and “below”.

[0080] In some embodiments, devices, etc., may be interpreted as physical or virtual, and their names are not limited to those described in the embodiments. Terms such as “device,” “equipment,” “circuit,” “network element,” “network function,” “network device,” “function,” “node,” “unit,” “section,” “system,” “network,” “chip,” “chip system,” “entity,” and “subject” are interchangeable.

[0081] In some embodiments, "network" can be interpreted as devices included in a network (e.g., access network devices, core network devices, etc.).

[0082] In some embodiments, the terms "access network device (AN device)," "radio access network device (RAN device)," "base station (BS)," "radio base station," "fixed station," "node," "access point," "transmission point (TP)," "reception point (RP)," "transmission / reception point (TRP)," "panel," "antenna panel," "antenna array," "cell," "macro cell," "small cell," "femto cell," "pico cell," "sector," "cell group," "serving cell," "carrier," "component carrier," and "bandwidth part (BWP)" can be used interchangeably.

[0083] In some embodiments, the terms "terminal", "terminal device", "user equipment (UE)", "user terminal", "mobile station (MS)", "mobile terminal (MT)", "subscriber station", "mobile unit", "subscriber unit", "wireless unit", "remote unit", "mobile device", "wireless device", "wireless communication device", "remote device", "mobile subscriber station", "access terminal", "mobile terminal", "wireless terminal", "remote terminal", "handset", "user agent", "mobile client", and "client" can be used interchangeably.

[0084] In some embodiments, access network devices, core network devices, or network devices can be replaced by terminals. For example, embodiments of this disclosure can also be applied to structures where communication between access network devices, core network devices, or network devices and terminals is replaced by communication between multiple terminals (e.g., device-to-device (D2D), vehicle-to-everything (V2X), etc.). In this case, the structure can also be configured such that the terminal has all or part of the functions of the access network device. Furthermore, terms such as "uplink" and "downlink" can be replaced with terms corresponding to communication between terminals (e.g., "sidelink"). For example, uplink channel, downlink channel, etc., can be replaced with sidelink channel, and uplink link, downlink, etc., can be replaced with sidelink link.

[0085] In some embodiments, the terminal may be replaced by an access network device, a core network device, or a network device. In this case, the access network device, core network device, or network device may also be configured to have all or some of the functions of the terminal.

[0086] In some embodiments, the acquisition of data, information, etc., may comply with the laws and regulations of the country where the location is situated.

[0087] In some embodiments, data, information, etc., may be obtained with the user's consent.

[0088] Furthermore, each element, each row, or each column in the table of this disclosure can be implemented as an independent embodiment, and any combination of any element, any row, or any column can also be implemented as an independent embodiment.

[0089] Figure 1 is a schematic diagram of the architecture of a communication system 100 according to an embodiment of the present disclosure. As shown in Figure 1, the communication system 100 may include: a terminal 101 and a network device 102.

[0090] In some embodiments, network device 102 may include at least one of an access network device and a core network device.

[0091] In some embodiments, terminal 101 includes, for example, at least one of the following: mobile phone, wearable device, Internet of Things (IoT) device or terminal, car with communication function, smart car, tablet computer, computer with wireless transceiver function, virtual reality (VR) terminal device, augmented reality (AR) terminal device, wireless terminal device in industrial control, wireless terminal device in self-driving, wireless terminal device in remote medical surgery, wireless terminal device in smart grid, wireless terminal device in transportation safety, wireless terminal device in smart city, and wireless terminal device in smart home, but is not limited thereto.

[0092] In some embodiments, the access network device is, for example, a node or device that connects a terminal to a wireless network. The access network device may include, but is not limited to, at least one of the following in a 5G communication system: evolved Node B (eNB), next-generation eNB (ng-eNB), next-generation Node B (gNB), node B (NB), home node B (HNB), home evolved Node B (HeNB), radio backhaul device, radio network controller (RNC), base station controller (BSC), base transceiver station (BTS), base band unit (BBU), mobile switching center, base station in a 6G communication system, open RAN, cloud RAN, base station in other communication systems, and access node in a wireless fidelity (WiFi) system.

[0093] In some embodiments, the technical solutions of this disclosure can be applied to the Open RAN architecture. In this case, the interfaces between or within access network devices involved in the embodiments of this disclosure can be transformed into internal interfaces of Open RAN. The processes and information interactions between these internal interfaces can be implemented by software or programs.

[0094] In some embodiments, the access network device may be composed of a central unit (CU) and a distributed unit (DU). The CU may also be called a control unit. The CU-DU structure can separate the protocol layer of the access network device. Some of the protocol layer functions are centrally controlled by the CU, while the remaining part or all of the protocol layer functions are distributed in the DU and centrally controlled by the CU. However, this is not the only possibility.

[0095] In some embodiments, the core network equipment may be a single device, a first network element, or a second network element, or multiple devices or a group of devices, respectively including all or part of the aforementioned first network element and / or second network element. Both the first network element and / or the second network element may be virtual or physical. The core network may include, for example, at least one of the following: evolved packet core (EPC), 5G core network (5GCN), next-generation core (NGC), and 6G core network (6GCN).

[0096] In some embodiments, the first network element may be a sensing function control (SF-C) node, but is not limited thereto.

[0097] It is understood that the communication system described in this disclosure is for the purpose of more clearly illustrating the technical solutions of this disclosure, and does not constitute a limitation on the technical solutions provided in this disclosure. As those skilled in the art will know, with the evolution of system architecture and the emergence of new business scenarios, the technical solutions provided in this disclosure are also applicable to similar technical problems.

[0098] The following embodiments of this disclosure can be applied to the communication system 100 shown in FIG1, or to some of the main bodies, but are not limited thereto. The main bodies shown in FIG1 are illustrative. The communication system may include all or some of the main bodies in FIG1, or may include other main bodies outside of FIG1. ​​The number and form of each main body are arbitrary. The connection relationship between the main bodies is illustrative. The main bodies may not be connected or may be connected. The connection can be in any way, it can be a direct connection or an indirect connection, it can be a wired connection or a wireless connection.

[0099] The embodiments disclosed herein can be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th Generation Mobile Communication System (4G), 5th Generation Mobile Communication System (5G), 6th Generation Mobile Communication System (6G), 5G New Radio (NR), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New Radio Access (NX), Future Generation Radio Access (FX), Global System for Mobile Communications (GSM), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), and IEEE 802.20, ultra-wideband (UWB), Bluetooth (a registered trademark), public land mobile network (PLMN) networks, device-to-device (D2D) systems, machine-to-machine (M2M) systems, Internet of Things (IoT) systems, vehicle-to-everything (V2X) systems, systems utilizing other communication methods, and next-generation systems built upon them. Furthermore, multiple systems can be combined (e.g., LTE or LTE-A combined with 5G, 5G combined with 5G, 5G combined with 6G, etc.) for application.

[0100] In some embodiments, in 4G or 5G carrier aggregation, the carriers participating in the aggregation are configured at the cell level, divided into primary cells (PCells) and secondary cells (SCells). The PCell is responsible for receiving system broadcast information, paging, and radio resource control (RRC) signaling connection management and mobility. System broadcast information on the SCell is configured via dedicated RRC signaling, and the SCell is responsible for data transmission and reception. Each cell participating in carrier aggregation can have a physical downlink control channel (PDCCH) for self-scheduling, or it can perform cross-carrier scheduling through RRC configuration. The PCell and at most one SCell can have a physical uplink control channel (PUCCH) to implement hybrid automatic repeat request (HARQ) feedback and channel state information (CSI) reporting for all carriers within the PUCCH set. When configuring SCells, each SCell is associated with an SCell index, using the cell as the basic unit. Furthermore, when configuring DL carrier configuration information, UL carrier configuration information can be nested. Therefore, a SCell currently configuring carrier aggregation can have only DL carriers configured, or both DL and UL carriers configured simultaneously. Consequently, the number of DL carriers is always greater than the number of UL carriers. Due to the diversity of services, some services have UL throughput exceeding DL throughput, and the current carrier aggregation configuration method cannot meet the diverse service requirements. Moreover, there is a one-to-one association between DL and UL carriers, making carrier management inflexible and unable to meet future service demands for high UL data throughput.

[0101] During mobility operations, due to the specific functional responsibilities of PCel1, any change to PCel will trigger a handover process, even if the target cell is a current SCell. Handover involves key changes leading to Media Access Control (MAC) resets, Packet Data Convergence Protocol (PDCP) or Radio Link Control (RLC) reconstruction, resulting in service interruptions and packet loss, impacting service performance. Conversely, a radio link failure (RLF) in PCel, regardless of whether the SCell experiences an RLF, will trigger a PCel RLF, thereby initiating RRC connection reconstruction, similarly causing service interruptions and packet loss, impacting service performance.

[0102] Traditional mobile communication system designs are based on the assumption that DL (Layered Path) traffic is the primary mode of operation. However, future 6G networks present use cases with high uplink traffic loads, including remote driving, machine vision, and factory video surveillance. In these cases, UL (Ultimate Path) traffic will be significantly higher due to limited DL data traffic. In PCells, time division duplex (TDD) configurations are typically designed to support more DL time slots, which is not UL-friendly. Therefore, synchronization signal / pbch block-less (SSB-less) SCells can be primarily used to support the additional UL traffic in these scenarios with heavy UL usage. DL services and network signaling will be offloaded to PCells or other SCells. Since only UL traffic can be scheduled in SSB-less SCells, from an energy-saving perspective, the network can correspondingly shut down the transmitters in SSB-less SCells. Therefore, significant network energy-saving gains are foreseeable.

[0103] In some embodiments, in the new radio (NR), a supplementary uplink (SUL) frequency is introduced in a cell in addition to the non-supplementary uplink (NUL) frequency, with the aim of improving uplink coverage in the NR high-frequency band. UE uplink power is limited, and the NR spectrum (high frequency, high propagation loss) has a relatively high frequency, thus limiting uplink coverage. To improve uplink coverage, the LTE spectrum (relatively lower frequency) is used for uplink, which can enhance uplink coverage. Two ULs and one DL belong to the same cell, and at most one physical uplink shared channel (PUSCH) can exist for transmission at any given time; unless the network explicitly instructs the UE to use a specific UL, the UE determines the UL selection based on a measurement threshold. This threshold is configured in the system broadcast. Dynamic switching between the two UL carriers is possible, indicated by downlink control information (DCI).

[0104] In some embodiments, both the NUL and SUL are configured with a set of independent random access channel (RACH) resource configurations, including independent carrier preamble configurations, independent carrier RO resource configurations, and independent RACH control parameter configurations.

[0105] In some embodiments, the terminal uses a 2-step random access method or a 4-step random access method for random access.

[0106] In some embodiments, DL public information is transmitted in a beam scanning manner. The UE measures different beam directions within the cell to determine its optimal beam direction.

[0107] In some embodiments, in the DL common signal or information, the UE receives downlink common signals or information under the measured good beam. When the UE initially accesses the network side, the UE needs to notify the network side of the good beam so that the network side can send dedicated data to the UE under the good beam. In order to notify the network side of the uplink good beam direction, during the RACH design process, the NR system associates the RO and / or preamble with the SSB, and the UE sends MSG1 (corresponding to the selected RO resource and / or preamble) to indicate which SSB the network-side quality beam corresponds to.

[0108] In some embodiments, for scenarios with high uplink traffic load, more UL carriers are configured to provide uplink throughput, but at the same time, more DL carriers are also configured, resulting in DL resource waste and low spectrum efficiency. Maintaining more DL carriers also leads to high network energy consumption.

[0109] In some embodiments, how a terminal performs a random access procedure to access the SCell is a matter that needs to be considered.

[0110] In some embodiments, the SCell in this disclosure may be the SCell of the first base station, and the SCell may be a UL only SCell.

[0111] In some embodiments, the serving cell of the terminal may be a cell of a second base station. This serving cell may be a PCell associated with the SCell, and the SCell and PCell jointly provide services to the terminal. The network device in this disclosure may be, but is not limited to, a second base station, and may also be other network devices.

[0112] Figure 2A is an interactive schematic diagram of a communication method according to an embodiment of the present disclosure. As shown in Figure 2A, the embodiment of the present disclosure relates to a communication method used in a communication system 100, the method including:

[0113] Step S2101: The network device sends the first information to the terminal.

[0114] In some embodiments, the terminal receives first information sent by the network device.

[0115] In some embodiments, the network device sends an RRC message to the terminal, the RRC message carrying first information.

[0116] In some embodiments, the first information may be indication information, configuration information, or cell information. Of course, the name of the first information may also be other, and this disclosure does not specifically limit it.

[0117] In some embodiments, before the network device sends the first information to the terminal, the network device performs one of the following: configures a UL carrier for the SCell but does not configure a DL carrier for the SCell; configures a UL carrier and a DL carrier for the SCell, wherein the number of UL carriers is greater than or equal to the number of DL carriers.

[0118] In some embodiments, the network device configures a UL carrier for the SCell based on the uplink and downlink traffic of the terminal, but does not configure a DL carrier for the SCell.

[0119] In some embodiments, when the uplink traffic of the terminal is greater than or equal to the downlink traffic, the network device configures a UL carrier for the SCell but does not configure a DL carrier for the SCell.

[0120] In some embodiments, the network device configures UL carriers and DL carriers for SCell based on the uplink and downlink traffic of the terminal, wherein the number of UL carriers is greater than or equal to the number of DL carriers.

[0121] In some embodiments, when the uplink traffic of the terminal is greater than or equal to the downlink traffic, the network device configures UL carriers and DL carriers for the SCell, and the number of UL carriers is greater than or equal to the number of DL carriers.

[0122] In some embodiments, when the network device configures a UL carrier for the SCell but not a DL carrier for the SCell, the network device sends first information to the terminal.

[0123] In some embodiments, when the network device configures UL carriers and DL carriers for SCell and the number of UL carriers is greater than or equal to the number of DL carriers, the network device sends first information to the terminal.

[0124] In some embodiments, the first information sent by the network device to the terminal is used to indicate a first cell associated with the SCell cell, and the first random access message sent by the network device in the first cell is used for the terminal to randomly access the SCell. Here, the first cell is configured with a DL carrier, and the first cell can be a PCell, but is not limited to this, and can also be any cell configured by the network.

[0125] In some embodiments, the first information sent by the network device to the terminal is used to indicate the DL carrier associated with the SCell cell, and the first random access message sent by the network device on the DL carrier is used for the terminal to randomly access the SCell.

[0126] In some embodiments, the first random access message for a terminal to access the SCell includes one of the following: a 2-step random access message; or a 4-step random access message. For example, if the terminal accesses the SCell using a 2-step random access method, the first random access message may be MSG B; if the terminal accesses the SCell using a 4-step random access method, the first random access message may be MSG2 or MSG4.

[0127] In step S2102, the network device sends the second information to the terminal.

[0128] In some embodiments, the terminal receives second information sent by the network device.

[0129] In some embodiments, the network device sends an RRC message to the terminal, the RRC message carrying second information.

[0130] In some embodiments, the second information may be resource information or instruction information. Of course, the name of the first information may also be other, and this disclosure does not specifically limit it.

[0131] In some embodiments, the network device sends second information to the terminal. This second information indicates random access resources, which are used by the terminal to send a second random access message. The second random access message is used by the terminal to randomly access the SCell. The second random access message includes one of the following: a 2-step random access message; or a 4-step random access message. Here, the 2-step random access message can be MSG A, and the 4-step random access message can be MSG1 or MSG3.

[0132] In some embodiments, if the terminal uses a two-step random access method to access the SCell, the second information sent by the network device to the terminal indicates the random access resources for the terminal to send a two-step random access message. Here, the random access resources can be RO resources or preamble resources.

[0133] In some embodiments, if the terminal uses a 4-step random access method to access the SCell, the second information sent by the network device to the terminal indicates the random access resources for the terminal to send a 4-step random access message. The random access resources can be RO resources or preamble resources.

[0134] In some embodiments, after the network device sends random access resources to the terminal, the terminal can determine the random access resources based on the second information. Here, the random access resources determined by the terminal can be RO resources or preamble resources, but are not limited to these. For example, the terminal determines the random access resources to be RO resources indicated by the second information. For example, the terminal determines the random access resources to be preamble resources indicated by the second information.

[0135] In some embodiments, the second information sent by the network device to the terminal is used to indicate at least one of the following: RO resources for accessing the SCell; preamble resources for accessing the SCell; and the mapping relationship between RO resources and SSBs.

[0136] In some embodiments, the SSB is an SSB transmitted in the first cell or an SSB transmitted on the DL carrier. Here, the first cell may also be referred to as the reference cell, and of course, the name of the first cell may be other than that, which is not specifically limited in this disclosure.

[0137] In some embodiments, when the second information indicates RO resources for accessing the SCell, after the network device sends the second information to the terminal, the terminal sends a second random access message based on the RO resources indicated by the second information. For example, if the terminal performs random access to the SCell based on a 2-step random access method, the terminal sends MSG A based on the RO resources indicated by the second information. If the terminal performs random access to the SCell based on a 4-step random access method, the terminal sends MSG1 based on the RO resources indicated by the second information.

[0138] In some embodiments, the terminal determines the RO for sending the second random access message based on the RO resource indicated by the second information sent by the network device, and the terminal sends the second random access message on the RO.

[0139] In some embodiments, when the second information indicates preamble resources for accessing the SCell, after the network device sends the second information to the terminal, the terminal sends a second random access message based on the preamble resources indicated by the second information. For example, if the terminal performs random access to the SCell based on a 2-step random access method, the terminal sends MSG A based on the preamble resources indicated by the second information. If the terminal performs random access to the SCell based on a 4-step random access method, the terminal sends MSG1 based on the preamble resources indicated by the second information.

[0140] In some embodiments, the terminal determines the preamble used to send the second random access message based on the preamble resources indicated by the second information sent by the network device, and the terminal sends the second random access message carrying the preamble.

[0141] In some embodiments, when the second information indicates the mapping relationship between RO resources and SSBs and the SSB is an SSB sent in the first cell, after the network device sends the second information to the terminal, the terminal determines the RO resource based on the SSB sent in the first cell and the mapping relationship, and the terminal sends a second random access message based on the RO resource.

[0142] For example, the mapping relationship includes: the relationship between the first SSB and the first RO resource; and the relationship between the second SSB and the second RO resource. If the SSB sent by the first cell is the second SSB, then the RO resource determined by the terminal is the second RO.

[0143] In some embodiments, when the second information indicates the mapping relationship between RO resources and SSBs and the SSB is an SSB transmitted on a DL carrier, after the network device sends the second information to the terminal, the terminal determines the RO resource based on the SSB transmitted on the DL carrier and the mapping relationship, and the terminal sends a second random access message based on the RO resource.

[0144] For example, the mapping relationship includes: the relationship between the first SSB and the first RO resource; and the relationship between the second SSB and the second RO resource. If the SSB transmitted by the DL carrier is the second SSB, then the RO resource determined by the terminal is the second RO.

[0145] In step S2103, the network device sends third information to the terminal.

[0146] In some embodiments, the terminal receives third information sent by the network device.

[0147] In some embodiments, the third information may be indication information or parameter information. Of course, the name of the first information may also be other, and this disclosure does not specifically limit it.

[0148] In some embodiments, the third information is used to indicate an offset value, which is used to compensate for uplink path loss of the terminal in the SCell.

[0149] In some embodiments, the uplink path loss is used by the terminal to determine the preamble set selected by the terminal for sending the second random message. The preamble set is either preamble set A or preamble set B, and different preamble sets contain different preambles.

[0150] In some embodiments, the offset value may be statically configured to the terminal. For example, the network device sends an RRC message to the terminal, and the RRC message carries third-party information.

[0151] In some embodiments, the offset value can be dynamically configured to the terminal. For example, the network device sends downlink control information (DCI) to the terminal, and the DCI carries third information.

[0152] In some embodiments, the offset value is associated with at least one of the following: the operating frequency of the terminal; and the terminal's mobility information, which indicates the terminal's mobility. For example, different operating frequencies correspond to different offset values, and different mobility levels correspond to different offset values.

[0153] In some embodiments, when the offset value is associated with the operating frequency of the terminal, the network device determines the offset value based on the operating frequency of the terminal, and the number of offset values ​​determined by the terminal can be one or more.

[0154] In some embodiments, when the offset value is associated with the terminal's mobility information, the network device determines the offset value based on the terminal's mobility information, and the number of offset values ​​determined by the terminal can be one or more.

[0155] In some embodiments, when the number of offset values ​​determined by the network device is a single value, the third information sent by the network device to the terminal is used to indicate the offset value, which is associated with the bandwidth portion (BWP) configured for the terminal.

[0156] In some embodiments, when the number of offset values ​​determined by the network device is a single value, the third information sent by the network device to the terminal is used to indicate the BWP configured for the terminal and the offset value, the offset value being associated with the BWP configured for the terminal.

[0157] In some embodiments, when the number of offset values ​​determined by the network device is multiple, the number of offset values ​​indicated by the third information sent by the network device to the terminal is also multiple, with different offset values ​​associated with different BWPs, each BWP including a narrowband. Here, when the BWP includes a narrowband, different narrowbands are associated with different numbers.

[0158] In some embodiments, when the number of offset values ​​determined by the network device is multiple, the number of offset values ​​indicated by the third information sent by the network device to the terminal is multiple, and different offset values ​​are associated with different BWPs, each BWP not including narrowband.

[0159] In some embodiments, each narrowband corresponds to a number, and different narrowbands have different numbers.

[0160] In some embodiments, where the number of offset values ​​determined by the network device is multiple and each BWP includes a narrowband, the third information is used to indicate the multiple offset values ​​and the BWP and narrowband associated with each offset value.

[0161] In some embodiments, where the number of offset values ​​determined by the network device is multiple and each BWP does not include a narrowband, the third information is used to indicate the multiple offset values ​​and the BWP associated with each offset value.

[0162] Step S2104: The terminal performs the operation.

[0163] In some embodiments, the operation performed by the terminal is: the terminal performs random access to SCell based on the first information.

[0164] In some embodiments, the first information sent by the network device is used to indicate a first cell associated with the SCell, and the terminal receives a first random access message for random access in the first cell.

[0165] In some embodiments, the first information sent by the network device is used to indicate the DL carrier associated with the SCell, and the terminal receives a first random access message on the DL carrier.

[0166] In some embodiments, the terminal performs the following operation: the terminal determines random access resources.

[0167] In some embodiments, random access resources include RO resources and / or preamble resources.

[0168] In some embodiments, the second information sent by the network device is used to indicate a random access resource, and the terminal determines the random access resource based on the second information. Here, the random access resource determined by the terminal can be a RO resource or a preamble resource, but is not limited to these. For example, the terminal determines the random access resource to be the RO resource indicated by the second information. For example, the terminal determines the random access resource to be the preamble resource indicated by the second information.

[0169] In some embodiments, the second information sent by the network device is used to indicate the RO resources for accessing the SCell, and the terminal determines the RO resources based on the second information.

[0170] In some embodiments, if the terminal performs random access to the SCell based on a 2-step random access method, the terminal sends MSG A based on the RO resource indicated by the second information. If the terminal performs random access to the SCell based on a 4-step random access method, the terminal sends MSG1 based on the RO resource indicated by the second information.

[0171] In some embodiments, the second information sent by the network device is used to indicate preamble resources, and the terminal determines the preamble resources based on the second information.

[0172] In some embodiments, if the terminal performs random access to the SCell based on a 2-step random access method, the terminal sends MSG A based on the preamble resource indicated by the second information. If the terminal performs random access to the SCell based on a 4-step random access method, the terminal sends MSG1 based on the preamble resource indicated by the second information.

[0173] In some embodiments, the second information sent by the network device is used to indicate the mapping relationship between RO resources and SSBs, and the terminal determines the RO resources based on the second information and the SSBs sent in the first cell.

[0174] In some embodiments, the mapping relationship includes: the relationship between the first SSB and the first RO resource; and the relationship between the second SSB and the second RO resource. If the SSB sent by the first cell is the second SSB, then the RO resource determined by the terminal is the second RO.

[0175] In some embodiments, the second information sent by the network device is used to indicate the mapping relationship between RO resources and SSBs, and the terminal determines the RO resources based on the second information and the SSBs sent on the DL carrier.

[0176] For example, the mapping relationship includes: the relationship between the first SSB and the first RO resource; and the relationship between the second SSB and the second RO resource. If the SSB transmitted by the DL carrier is the second SSB, then the RO resource determined by the terminal is the second RO.

[0177] In some embodiments, the terminal performs the following operation: the terminal determines the preamble set.

[0178] In some embodiments, the terminal determines the uplink path loss in the SCell; based on the uplink path loss, the terminal determines the preamble set selected by the terminal for sending the second random access message, which is either preamble set A or preamble set B. If the uplink path loss is greater than a loss threshold, the terminal determines that the preamble set selected by the terminal for sending the second random access message is preamble set A; if the uplink path loss is less than the loss threshold, the terminal determines that the preamble set selected by the terminal for sending the second random access message is preamble set B. The units for uplink path loss and loss threshold can be watts, and the loss threshold can be specified by the protocol or configured on the network side; no limitation is made here.

[0179] In some embodiments, the terminal performs the following operation: the terminal determines the uplink path loss.

[0180] In some embodiments, the terminal determines the uplink path loss based on an offset value, transmit power, and receive power; wherein the offset value is used to adjust the path loss of the SCell, the transmit power is the power used to transmit an SSB on the reference carrier, and the receive power is the power used to receive an SSB on the reference carrier. Here, the receive power can be RSRP.

[0181] In some embodiments, the reference carrier is a DL carrier, and the terminal determines the uplink path loss based on the offset value, transmit power, and receive power; wherein, the offset value is used to adjust the path loss of the SCell, the transmit power is the power used to transmit an SSB on the DL carrier, and the receive power is the power used to receive an SSB on the DL carrier. Here, the receive power can be RSRP.

[0182] In some embodiments, the terminal determines the uplink path loss based on an offset value, transmit power, and receive power; wherein the offset value is used to adjust the path loss of the SCell, the transmit power is the power used to transmit an SSB in the first cell, and the receive power is the power used to receive an SSB in the first cell. Here, the receive power can be RSRP.

[0183] In some embodiments, when the number of offset values ​​indicated by the third information sent by the network device is a single value, the offset value used by the terminal is the offset value indicated by the third information.

[0184] In some embodiments, when the number of offset values ​​indicated by the third information sent by the network device is multiple, since different offset values ​​are associated with different BWPs, the offset value used by the terminal can be an offset value determined from the multiple offset values ​​based on the BWP configured for the terminal.

[0185] In some embodiments, when the number of offset values ​​indicated by the third information sent by the network device is multiple, since different offset values ​​are associated with different BWPs and narrowbands, the offset value used by the terminal can be an offset value determined from the multiple offset values ​​based on the BWP and narrowband configured for the terminal.

[0186] In some embodiments, the BWP and / or narrowband used by the terminal may be determined based on protocol specifications, network configuration and / or predefined information, and are not limited herein.

[0187] In some embodiments, the terminal performs the following operation: the terminal determines RA-RNTI.

[0188] In some embodiments, the terminal determines the RA-RNTI of the SCell based on the SCell's index. The RA-RNTI in the network device and the terminal are the same; in some embodiments, the network device also determines the RA-RNTI of the SCell based on the SCell's index.

[0189] In some embodiments, the names of information, etc., are not limited to the names described in the embodiments. Terms such as "information", "message", "signal", "signaling", "report", "configuration", "indication", "instruction", "command", "channel", "parameter", "domain", "field", "symbol", "symbol", "codebook", "codeword", "codepoint", "bit", "data", "program", and "chip" can be used interchangeably.

[0190] In some embodiments, “get,” “obtain,” “receive,” “transmit,” “bidirectional transmission,” and “send and / or receive” can be used interchangeably and can be interpreted as receiving from other entities, obtaining from protocols, obtaining from higher layers, obtaining through self-processing, or autonomous implementation, among other meanings.

[0191] In some embodiments, terms such as “send,” “transmit,” “report,” “distribute,” “transmit,” “bidirectional transmission,” “send and / or receive” can be used interchangeably.

[0192] In some embodiments, terms such as "certain", "preset", "default", "set", "indicated", "a certain", "any", and "first" can be used interchangeably. "Certain A", "preset A", "default A", "set A", "indicated A", "a certain A", "any A", and "first A" can be interpreted as A pre-defined in a protocol or the like, or as A obtained through setting, configuration, or instruction, or as specific A, a certain A, any A, or first A, but are not limited thereto.

[0193] The communication method involved in the embodiments of this disclosure may include at least one of steps S2101 to S2104. For example, step S2101 can be implemented as a standalone embodiment; step S2102 can be implemented as a standalone embodiment; step S2103 can be implemented as a standalone embodiment; and step S2104 can be implemented as a standalone embodiment. For example, a combination of steps S2101 and S2104 can be implemented as a standalone embodiment; a combination of steps S2102 and S2104 can be implemented as a standalone embodiment; a combination of steps S2103 and S2104 can be implemented as a standalone embodiment; and a combination of steps S2101, S2102, S2103, and S2104 can be implemented as a standalone embodiment.

[0194] In some embodiments, step S2102 may be optional, and one or more of these steps may be omitted or substituted in different embodiments.

[0195] In some embodiments, step S2103 may be optional, and one or more of these steps may be omitted or substituted in different embodiments.

[0196] In the embodiments disclosed herein, each embodiment can be implemented individually or in combination with each other, and the steps in each embodiment can be distinguished by their order.

[0197] Figure 3A is an interactive schematic diagram illustrating a communication method according to an embodiment of the present disclosure. As shown in Figure 3A, the present disclosure relates to a communication method, which includes:

[0198] Step S3101: The network device sends the first information to the terminal.

[0199] In step S3102, the terminal receives the first information sent by the network device.

[0200] In some embodiments, the first information is used to indicate a first cell associated with a secondary cell (SCell) or a downlink DL carrier associated with the SCell. A first random access message sent by the network device on the first cell or the DL carrier is used by the terminal for random access to the SCell. The terminal receives the first random access message on the first cell or the DL carrier.

[0201] In some embodiments, when the network device configures a UL carrier for the SCell but not a DL carrier, the network device sends first information to the terminal. The terminal receives a first random access message on the first cell or the DL carrier.

[0202] In some embodiments, when the network device configures UL carriers and DL carriers for the SCell, and the number of UL carriers is greater than or equal to the number of DL carriers, the network device sends first information to the terminal. The terminal receives a first random access message on the first cell or a DL carrier.

[0203] In some embodiments, the first information sent by the network device to the terminal is used to indicate a first cell associated with the SCell cell, and the first random access message sent by the network device in the first cell is used by the terminal to randomly access the SCell. The terminal receives the first random access message in the first cell.

[0204] In some embodiments, the first information sent by the network device to the terminal is used to indicate the DL carrier associated with the SCell cell, and the first random access message sent by the network device on the DL carrier is used by the terminal to randomly access the SCell. The terminal receives the first random access message on the DL carrier. Optional implementations of steps S3101 and S3102 can be found in the optional implementations of steps S2101 to S2104 in FIG. 2A, and other related parts in the embodiments involved in FIG. 2A, which will not be repeated here.

[0205] The communication method involved in the embodiments of this disclosure may include at least one of steps S3101 to S3102. For example, step S3101 may be implemented as a standalone embodiment; step S3102 may be implemented as a standalone embodiment. For example, a combination of steps S3101 and S3102 may be implemented as a standalone embodiment.

[0206] In the embodiments disclosed herein, each embodiment can be implemented individually or in combination with each other, and the steps in each embodiment can be distinguished by their order.

[0207] In some embodiments, the steps and their optional implementations in other embodiments described before or after this embodiment, as well as other related parts in the specification, can be referred to, and will not be repeated here.

[0208] Figure 3B is an interactive schematic diagram illustrating a communication method according to an embodiment of the present disclosure. As shown in Figure 3B, the embodiments of the present disclosure relate to a communication method, which includes:

[0209] Step S3201: The network device sends the second information to the terminal.

[0210] In step S3202, the terminal receives the second information sent by the network device.

[0211] In some embodiments, the second information is used to indicate at least one of the following:

[0212] Random access channel timing (RO) resources used for accessing SCell;

[0213] Preamble resources used for accessing SCell;

[0214] The mapping relationship between RO resources and synchronization signal blocks (SSBs), where SSBs are either SSBs transmitted in the first cell or SSBs transmitted on the DL carrier.

[0215] In some embodiments, when the second information indicates the RO resource for accessing the SCell, after the network device sends the second information to the terminal, the terminal sends a second random access message based on the RO resource indicated by the second information.

[0216] In some embodiments, when the second information indicates a preamble resource for accessing the SCell, after the network device sends the second information to the terminal, the terminal sends a second random access message based on the preamble resource indicated by the second information.

[0217] In some embodiments, when the second information indicates the mapping relationship between RO resources and SSBs and the SSB is an SSB sent in the first cell, after the network device sends the second information to the terminal, the terminal determines the RO resource based on the SSB sent in the first cell and the mapping relationship, and the terminal sends a second random access message based on the RO resource.

[0218] In some embodiments, when the second information indicates the mapping relationship between RO resources and SSBs and the SSB is an SSB transmitted on a DL carrier, after the network device sends the second information to the terminal, the terminal determines the RO resource based on the SSB transmitted on the DL carrier and the mapping relationship, and the terminal sends a second random access message based on the RO resource.

[0219] The optional implementations of steps S3201 and S3202 can be found in the optional implementations of steps S2101 to S2104 in Figure 2A, as well as other related parts in the embodiments involved in Figure 2A, which will not be repeated here.

[0220] The communication method disclosed herein may include at least one of steps S3201 to S3202. For example, step S3201 may be implemented as a standalone embodiment; step S3202 may be implemented as a standalone embodiment. For example, a combination of steps S3201 and S3202 may be implemented as a standalone embodiment.

[0221] In the embodiments disclosed herein, each embodiment can be implemented individually or in combination with each other, and the steps in each embodiment can be distinguished by their order.

[0222] In some embodiments, the steps and their optional implementations in other embodiments described before or after this embodiment, as well as other related parts in the specification, can be referred to, and will not be repeated here.

[0223] To better understand the embodiments of this disclosure, the technical solutions of this disclosure are further described below through some exemplary embodiments:

[0224] Example 1, see Figure 4A, shows a scenario where only the uplink secondary cell communicates with the terminal:

[0225] In some embodiments, the UL-only SCell is configured via RRC signaling to associate with a cell or DL ​​carrier. The associated cell or DL ​​carrier is used to receive MSG2 or MSG4 for 4-step RACH or MSG B for 2-step RACH during random access. It is associated with a PCell by default.

[0226] In some embodiments, RO resource configuration (e.g., PRACH configuration index, etc.) on a UL-only SCell is configured via RRC dedicated signaling, and the mapping relationship between RO resources and SSBs is also configured via RRC dedicated signaling, where the SSB is the SSB on the reference cell or reference DL carrier. The RSRP of the SSB measured on the associated cell or DL ​​carrier is used to determine the selected RO resource, / or preamble resource. A random access procedure is then performed.

[0227] In some embodiments, during random access procedures, during the access resource selection process, the UE needs to use path loss to determine whether to select preamble group A or preamble group B, i.e.:

[0228] If the potential Msg3 size is greater than ra-Msg3SizeGroupA and the path loss is less than PCMAX-PreambleReceivedTargetPower-Msg3-DeltaPreamble-MessagePowerOffsetGroupB; or...

[0229] If a random access procedure is initiated for the common control channel (CCCH) logical channel and the size of the CCCH server data unit (SDU) plus the MAC sub-header is greater than ra-Msg3SizeGroupA: Select random access preamble group B. Otherwise: Select random access preamble group A.

[0230] In some embodiments, pathloss is calculated based on the received power (RSRP) of the SSB of the associated cell or DL ​​carrier, the SSB transmit power, and an offset configured on the network side. That is, pathloss = (SSB transmit power - RSRP of SSB) + offset or pathloss = (SSB transmit power - RSRP of SSB) - offset.

[0231] In some embodiments, because a DL carrier may need to receive random access procedures on multiple UL carriers, to avoid RA-RNTI conflicts, the index information of the DL carrier needs to be included in the RA-RNTI calculation formula. This could be the serving cell index of the UL carrier, or an index configured on the network side for calculating RA-RNTI, such as the SCell index associated with the same cell or DL ​​carrier. The Servingcellindex of the associated cell can be set to 0 by default.

[0232] For example, regarding 4-step random access:

[0233] RA-RNTI=1+s_id+14×t_id+14×80×f_id+14×80×8×ul_carrier_id+14×80×8×2×Servingcellindex

[0234] Where s_id is the index of the first Orthogonal Frequency Division Multiplexing (OFDM) symbol of the physical rache (PRACH) timing (0≤s_id<14), t_id is the index of the first slot of the PRACH timing in the system frame (0≤t_id<80), where the subcarrier spacing for determining t_id is based on the value of μ specified for μ={0,1,2,3} and for μ={5,6}, t_id is the index of the 120kHz slot in the system frame containing the PRACH timing (0≤t_id<80), f_id is the index of the PRACH timing in the frequency domain (0≤f_id<8), and ul_carrier_id is the UL carrier used for random access preamble transmission (0 indicates NUL carrier, 1 indicates SUL carrier).

[0235] For example, regarding 2-step random access:

[0236] MSGB-RNTI=1+s_id+14×t_id+14×80×f_id+14×80×8×ul_carrier_id+14×80×8×2++14×80×8×2×Servingcellindex

[0237] Where s_id is the index of the first OFDM symbol of the PRACH timing (0≤s_id<14), t_id is the index of the first slot of the PRACH timing in the system frame (0≤t_id<80), where the subcarrier spacing for determining t_id is based on the value of μ specified for μ={0,1,2,3} and for μ={5,6}, t_id is the index of the 120kHz slot in the system frame containing the PRACH timing (0≤t_id<80), f_id is the index of the PRACH timing in the frequency domain (0≤f_id<8), and ul_carrier_id is the UL carrier used for random access preamble transmission (0 indicates NUL carrier, 1 indicates SUL carrier).

[0238] In this embodiment of the disclosure, some or all of the steps and their optional implementations can be arbitrarily combined with some or all of the steps in other embodiments, or arbitrarily combined with the optional implementations in other embodiments.

[0239] This disclosure also proposes an apparatus (also referred to as a communication device, etc.) for implementing any of the above methods. For example, an apparatus is proposed, which includes units or modules for implementing the steps performed by the terminal in any of the above methods. Another apparatus is also proposed, including units or modules for implementing the steps performed by a network device (e.g., an access network device, a core network functional node, a core network device, etc.) in any of the above methods. Here, the core network device may include, but is not limited to, at least one of the following: a first network element and a second network element, etc.

[0240] It should be understood that the division of units or modules in the above device is only a logical functional division. In actual implementation, they can be fully or partially integrated into a single physical entity, or they can be physically separated. Furthermore, the units or modules in the device can be implemented by a processor calling software: for example, the device includes a processor connected to a memory containing instructions. The processor calls the instructions stored in the memory to implement any of the above methods or to implement the functions of the units or modules in the above device. The processor can be, for example, a general-purpose processor, such as a central processing unit (CPU) or a microprocessor, and the memory can be internal or external to the device. Alternatively, the units or modules in the device can be implemented in the form of hardware circuits. The functionality of some or all of the units or modules can be achieved through the design of these hardware circuits, which can be understood as one or more processors. For example, in one implementation, the hardware circuit is an application-specific integrated circuit (ASIC). The functionality of some or all of the units or modules is achieved through the design of the logical relationships between the components within the circuit. In another implementation, the hardware circuit can be implemented using a programmable logic device (PLD). Taking a field-programmable gate array (FPGA) as an example, it can include a large number of logic gates. The connection relationships between the logic gates are configured through a configuration file, thereby achieving the functionality of some or all of the units or modules. All units or modules of the above device can be implemented entirely through processor-called software, entirely through hardware circuits, or partially through processor-called software with the remaining parts implemented through hardware circuits.

[0241] In this embodiment, the processor is a circuit with signal processing capabilities. In one implementation, the processor can be a circuit with instruction read and execute capabilities, such as a CPU, microprocessor, graphics processing unit (GPU) (which can be understood as a microprocessor), or digital signal processor (DSP). In another implementation, the processor can implement certain functions through the logical relationships of hardware circuits. The logical relationships of the aforementioned hardware circuits are fixed or reconfigurable, such as hardware circuits implemented by processor ASICs or PLDs, such as FPGAs. In reconfigurable hardware circuits, the process of the processor loading a configuration document and configuring the hardware circuit can be understood as the process of the processor loading instructions to implement the functions of some or all of the above units or modules. Furthermore, it can also be a hardware circuit designed for artificial intelligence, which can be understood as an ASIC, such as a neural network processing unit (NPU), tensor processing unit (TPU), deep learning processing unit (DPU), etc.

[0242] Figure 5A is a schematic diagram of the structure of a terminal 5100 provided in an embodiment of this disclosure. As shown in Figure 5A, the terminal 5100 includes a transceiver module 5101. In some embodiments, the transceiver module 5101 is used to receive information, etc. Optionally, the transceiver module 5101 is used to perform at least one of the sending and / or receiving steps performed by the terminal 5100 in any of the above methods, which will not be described in detail here. In some embodiments, the terminal 5100 may include a processing module 5102.

[0243] Figure 5B is a schematic diagram of the structure of a network device 5200 provided in an embodiment of this disclosure. As shown in Figure 5B, the network device 5200 includes a transceiver module 5201. In some embodiments, the transceiver module 5201 is used to send information, etc. Optionally, the transceiver module 5201 is used to perform at least one of the sending and / or receiving steps performed by the network device 5200 in any of the above methods, which will not be described in detail here. In some embodiments, the network device 5200 may include a processing module 5202.

[0244] In some embodiments, the transceiver module may include a transmitting module and / or a receiving module, which may be separate or integrated. Optionally, the transceiver module may be interchangeable with a transceiver. Exemplarily, the transceiver module described above includes a transmitting module and / or a receiving module.

[0245] In some embodiments, the processing module may be a single module or may include multiple sub-modules. Optionally, the multiple sub-modules may each perform all or part of the steps required by the processing module. Optionally, the processing module may be interchangeable with a processor.

[0246] Figure 6A is a schematic diagram of the structure of the communication device 6100 proposed in an embodiment of this disclosure. The communication device 6100 can be a network device (e.g., access network device, core network device, etc.), a terminal, a chip, chip system, or processor that supports the network device in implementing any of the above methods, or a chip, chip system, or processor that supports the terminal in implementing any of the above methods. The communication device 6100 can be used to implement the methods described in the above method embodiments; for details, please refer to the descriptions in the above method embodiments.

[0247] As shown in Figure 6A, the communication device 6100 includes one or more processors 6101. The processor 6101 can be a general-purpose processor or a dedicated processor, such as a baseband processor or a central processing unit (CPU). The baseband processor can be used to process communication protocols and communication data, while the CPU can be used to control communication devices (e.g., base stations, baseband chips, terminal devices, terminal device chips, DUs or CUs, etc.), execute programs, and process program data. Optionally, the communication device 6100 can be used to execute any of the above methods. Optionally, one or more processors 6101 can be used to invoke instructions to cause the communication device 6100 to execute any of the above methods.

[0248] In some embodiments, the communication device 6100 further includes one or more transceivers 6102. When the communication device 6100 includes one or more transceivers 6102, the transceiver 6102 performs at least one of the communication steps such as sending and / or receiving in the above method, and the processor 6101 performs at least one of the other steps. In optional embodiments, the transceiver may include a receiver and / or a transmitter, which may be separate or integrated. Optionally, the terms transceiver, transceiver unit, transceiver, transceiver circuit, interface circuit, interface, etc., can be used interchangeably; the terms transmitter, transmitting unit, transmitter, transmitting circuit, etc., can be used interchangeably; and the terms receiver, receiving unit, receiver, receiving circuit, etc., can be used interchangeably.

[0249] In some embodiments, the communication device 6100 further includes one or more memories 6103 for storing data. Optionally, all or part of the memories 6103 may be located outside the communication device 6100. In optional embodiments, the communication device 6100 may include one or more interface circuits 6104. Optionally, the interface circuits 6104 are connected to the memories 6103 and can be used to receive data from the memories 6103 or other devices, and to send data to the memories 6103 or other devices. For example, the interface circuits 6104 can read data stored in the memories 6103 and send that data to the processor 6101.

[0250] The communication device 6100 described in the above embodiments may be a network device or a terminal, but the scope of the communication device 6100 described in this disclosure is not limited thereto, and the structure of the communication device 6100 may not be limited by FIG. 6A. The communication device may be a standalone device or a part of a larger device. For example, the communication device may be: (1) a standalone integrated circuit IC, or chip, or chip system or subsystem; (2) a collection of one or more ICs, optionally, the IC collection may also include storage components for storing data and programs; (3) an ASIC, such as a modem; (4) a module that can be embedded in other devices; (5) a receiver, terminal device, smart terminal device, cellular phone, wireless device, handheld device, mobile unit, vehicle device, network device, cloud device, artificial intelligence device, etc.; (6) others, etc.

[0251] Figure 6B is a schematic diagram of the structure of chip 6200 according to an embodiment of this disclosure. For cases where the communication device 6100 can be a chip or a chip system, please refer to the schematic diagram of chip 6200 shown in Figure 6B, but it is not limited thereto.

[0252] Chip 6200 includes one or more processors 6201. Chip 6200 is used to perform any of the methods described above.

[0253] In some embodiments, chip 6200 further includes one or more interface circuits 6202. Optionally, terms such as interface circuit, interface, and transceiver pin can be used interchangeably. In some embodiments, chip 6200 further includes one or more memories 6203 for storing data. Optionally, all or part of the memories 6203 may be located outside chip 6200. Optionally, interface circuit 6202 is connected to memory 6203, and interface circuit 6202 can be used to receive data from memory 6203 or other devices, and interface circuit 6202 can be used to send data to memory 6203 or other devices. For example, interface circuit 6202 can read data stored in memory 6203 and send the data to processor 6201.

[0254] In some embodiments, the interface circuit 6202 performs at least one of the communication steps, such as sending and / or receiving, in the above-described method. For example, the interface circuit 6202 performing the communication steps, such as sending and / or receiving, in the above-described method means that the interface circuit 6202 performs data interaction between the processor 6201, the chip 6200, the memory 6203, or the transceiver device. In some embodiments, the processor 6201 performs at least one of the other steps.

[0255] The modules and / or devices described in the various embodiments, such as virtual devices, physical devices, and chips, can be combined or separated arbitrarily as needed. Optionally, some or all steps can also be performed collaboratively by multiple modules and / or devices, which is not limited here.

[0256] This disclosure also proposes a storage medium storing instructions that, when executed on the communication device 6100, cause the communication device 6100 to perform any of the above methods. Optionally, the storage medium is an electronic storage medium. Optionally, the storage medium is a computer-readable storage medium, but not limited thereto; it may also be a storage medium readable by other devices. Optionally, the storage medium may be a non-transitory storage medium, but not limited thereto; it may also be a temporary storage medium.

[0257] This disclosure also proposes a program product, including a program and / or instructions, which, when executed by a communication device, cause the communication device to perform any of the above methods. Optionally, the program product is a computer program product. Optionally, the program product is stored on the storage medium.

[0258] This disclosure also proposes a computer program that, when run on a computer, causes the computer to perform any of the above methods.

Claims

1. A communication method characterized by comprising: Performed by a network device, the method includes: Send the first message to the terminal; Wherein, the first information is used to indicate a first cell associated with the secondary cell SCell or a downlink DL carrier associated with the SCell, and the first random access message sent by the network device on the first cell or the DL carrier is used for the terminal to randomly access the SCell.

2. The method of claim 1, wherein, The SCell is configured with an uplink UL carrier and the SCell is not configured with a DL carrier, or the SCell is configured with both UL carriers and DL carriers, and the number of UL carriers is greater than or equal to the number of DL carriers.

3. The method according to claim 1 or 2, characterized in that, The method further includes: Send the second information to the terminal; The second information is used to indicate random access resources, which are used by the terminal to send a second random access message, and the second random access message is used by the terminal to randomly access the SCell.

4. The method of claim 3, wherein, The second information is used to indicate at least one of the following: Random access channel timing (RO) resources used for accessing the SCell; Used to access the preamble resources of the SCell; The mapping relationship between RO resources and synchronization signal blocks (SSBs) is defined as follows: the SSB is either an SSB transmitted in the first cell or an SSB transmitted on the DL carrier.

5. The method according to any one of claims 1 to 4, characterized in that, The method further includes: Send third information to the terminal; The third information is used to indicate the offset value, which is used to compensate for the uplink path loss of the terminal in the SCell.

6. The method according to any one of claims 1 to 5, characterized in that, The method further includes: Based on the index of the SCell, the Radio Access Network Temporary Identifier RA-RNTI of the SCell is determined.

7. A communication method characterized by comprising: The method, executed by a terminal, includes: The network device receives first information, which is used to indicate a first cell associated with the secondary cell SCell or a downlink DL carrier associated with the SCell. The network device sends a first random access message on the first cell or the DL carrier for the terminal to randomly access the SCell.

8. The method of claim 7, wherein, The SCell is configured with an uplink UL carrier and the SCell is not configured with a DL carrier, or the SCell is configured with both UL carriers and DL carriers, and the number of UL carriers is greater than or equal to the number of DL carriers.

9. The method according to claim 7 or 8, characterized in that, The method further includes: Receive the second information sent by the network device; The second information is used to indicate random access resources, the random access resources are used to send a second random access message, and the second random access message is used for the terminal to randomly access the SCell.

10. The method of claim 9, wherein, The second information is used to indicate at least one of the following: Random access channel timing (RO) resources used for accessing the SCell; Used to access the preamble resources of the SCell; The mapping relationship between RO resources and synchronization signal blocks (SSBs) is defined as follows: the SSB is either an SSB transmitted in the first cell or an SSB transmitted on the DL carrier.

11. The method according to any one of claims 7 to 10, characterized in that, The method further includes: Determine the reference signal received power RSRP of the SSB, wherein the SSB is an SSB transmitted in the first cell or an SSB transmitted on the DL carrier; The random access resource selected by the terminal for random access to the Scell ​​is determined based on the RSRP; After receiving the first random access message, a second random access message for accessing the SCell is sent to the SCell based on the random access resources. The second random access message is used for the terminal to randomly access the SCell.

12. The method of claim 11, wherein, The random access resources are RO resources and / or preamble resources.

13. The method according to claim 11 or 12, characterized in that, The method further includes: Determine the uplink path loss of the terminal in the SCell; The preamble set selected by the terminal for sending the second random message is determined based on the uplink path loss, and the preamble set is either preamble set A or preamble set B.

14. The method of claim 13, wherein, Determining the uplink path loss of the terminal in the SCell includes: Uplink path loss is determined based on the RSRP of the SSB, the transmit power of the SSB, and the offset value. The offset value is used to compensate for the uplink path loss of the terminal in the Scell, and the SSB is an SSB transmitted in the first cell or an SSB transmitted on the DL carrier.

15. The method of claim 14, wherein, The method further includes: Receive third information sent by the network device; The third piece of information is used to indicate the offset value.

16. The method according to any one of claims 7 to 15, characterized in that, The method further includes: Based on the index of the SCell, determine the RA-RNTI of the SCell.

17. A communication device, characterized by The communication device is used to perform the communication method according to any one of claims 1 to 6 and claims 7 to 16.

18. A storage medium, the storage medium storing instructions, wherein, When the instructions are executed on the communication device, the communication device performs the communication method as described in any one of claims 1 to 6, or claims 7 to 16.

19. A program product comprising at least one of a program, instructions, characterized in that When at least one of the programs or instructions is executed by the communication device, it implements the communication method according to any one of claims 1 to 6 and claims 7 to 16.

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