RU2775832C2 - Communication method, terminal device and network device - Google Patents

Abstract

FIELD: wireless communication.

SUBSTANCE: claimed communication method includes: reception by means of a terminal device of indication information sent by a network device, wherein indication information is used to indicate resource configuration information of at least one uplink carrier, while at least one uplink carrier includes the first uplink carrier and/or at least one second uplink carrier, the first uplink carrier and at least one second uplink carrier are different uplink carriers in a cell of the network device, and the first uplink carrier and at least one second uplink carrier correspond to one downlink carrier in the network; and determination by means of the terminal device, based on resource configuration information, of at least one uplink carrier, one uplink carrier of at least one uplink carrier as a target carrier for random access.

EFFECT: increase in the efficiency of selection of an uplink carrier.

34 cl, 10 dwg

Description

[0001] The present application claims the priority of Chinese Patent Application No. 201711147611.9 filed with the National Intellectual Property Office of China on November 17, 2017, entitled "COMMUNICATION METHOD, TERMINAL DEVICE, AND NETWORK DEVICE", which is incorporated herein by reference in its entirety .

The technical field to which the invention belongs

[0002] The present application relates to the field of communication and, more specifically, to a communication method, a terminal device and a network device in the field of communication.

State of the art

[0003] A conventional cell includes one downlink carrier and one uplink carrier, and in the conventional cell, the uplink carrier frequency is the same or similar to the downlink carrier frequency. However, in a New Radio (NR) system, when a high frequency cell is deployed, the operating bandwidth of the high frequency cell is relatively high and the transmission power of the terminal apparatus is relatively low, so that the terminal apparatus located in the edge region of the cell can receive a signal. the base station to which the cell belongs, but the base station cannot receive the terminal device signal in the edge region, in other words, the uplink coverage and the downlink coverage are asymmetric. In addition to the cell's original high uplink frequency band, one or more additional lower frequency uplink frequency bands may be introduced to send uplink signals to solve this problem. The lower frequency uplink band may be referred to as a supplementary uplink carrier (Supplementary Uplink, SUL). Since the uplink additional bandwidth has less signal attenuation, the uplink coverage can be extended so that the uplink coverage can be matched with the downlink coverage. For example, an actual deployment may use a 1.8 GHz uplink band, a 3.5 GHz uplink band, and a 3.5 GHz downlink band. However, this is not limited, and alternatively, a solution to deploy another frequency band can be used. Therefore, when there are multiple uplink frequency bands in a cell, how a terminal device selects a carrier (i.e., selects a resource) when accessing a cell, and how a network device performs resource configuration presents a problem to be solved urgently.

The essence of the invention

[0004] The present application provides a communication method, a terminal device, and a network device, so that an uplink carrier can be selected from a cell supporting multiple uplink frequency bands to perform random access.

[0005] According to a first aspect, a communication method is provided, including:

the terminal device receiving indication information sent by the network device, wherein the indication information is used to indicate resource configuration information of at least one uplink carrier, at least one uplink carrier includes a first uplink carrier and/or at least one second uplink carrier, the first uplink carrier and at least one second uplink carrier are different uplink carriers in a network device cell, and the first uplink carrier and at least one second uplink carrier correspond to one downlink carrier per cell; and

determining by the terminal device, based on the resource configuration information of the at least one uplink carrier, one uplink carrier of the at least one uplink carrier as a target carrier for performing random access.

[0006] Therefore, in this embodiment of the present application, when a cell (i.e., a target cell) of a network device to which a terminal device is to be handed over includes a first uplink carrier and at least one second uplink carrier , and the first uplink carrier and at least one second uplink carrier correspond to one downlink carrier in the target cell, the network device can send to the terminal device resource configuration information of at least one uplink carrier including the first an uplink carrier and/or at least one second uplink carrier, so that the terminal device can determine, based on the resource configuration information of the at least one uplink carrier, one uplink carrier from the at least one uplink carrier as a target left carrier to perform random access.

[0007] The communication method in this embodiment of the present application can be applied to a handover scenario and a dual connectivity scenario. Specifically, in a handover scenario, the network device is the target network device, and the indication information may be included in the handover request response message and the handover message. In the dual connectivity scenario, the network device is the secondary base station, and indication information may be included in the secondary station addition request confirmation message and the RRC connection reconfiguration message.

[0008] It should be understood that the first uplink carrier and the second uplink carrier are uplink carriers with different frequency bands. For example, the first uplink carrier may be a high band uplink carrier deployed in the NR 5G system, and the uplink carrier may be referred to as an NR UL carrier, a PUL carrier, a normal UL carrier, or a conventional UL carrier. The second uplink carrier is a low band uplink carrier (for example, in an LTE system or other communication system) and may be used to assist the terminal apparatus in uplink transmission, and this uplink carrier may be referred to as a SUL carrier. .

[0009] Optionally, the indication information is carried in the reconfiguration message used for synchronization, and the reconfiguration message used for synchronization includes said first uplink carrier resource configuration information and said second uplink carrier resource configuration information, or the reconfiguration message used for synchronization includes said first uplink carrier configuration information or said second uplink carrier configuration information.

[0010] Optionally, the uplink first carrier configuration information includes at least one of a physical uplink shared channel (PUSCH) configuration, a physical uplink control channel (PUCCH) configuration, a sounding reference signal configuration ( SRS) and the uplink power control configuration of the first uplink carrier. The uplink second carrier configuration information includes at least one of a physical uplink shared channel (PUSCH) configuration, a physical uplink control channel (PUCCH) configuration, a sounding reference signal (SRS) configuration, and an uplink power control configuration. the communication link of the second uplink carrier.

[0011] Optionally, the resource configuration information includes a dedicated random access resource and determining, by the terminal device, based on the resource configuration information, at least one uplink carrier, one uplink carrier of said at least one uplink carrier communication as a target carrier to perform random access includes:

determining by the terminal device, based on the indication information, at least one uplink carrier corresponding to the dedicated random access resource; and

if the at least one uplink carrier includes one uplink carrier, determining the uplink carrier as the target carrier by the terminal device; or

if the at least one uplink carrier includes at least two uplink carriers, determining by the terminal device one of the at least two uplink carriers as the target carrier.

[0012] That is, when the resource configuration information in the indication information includes the dedicated random access resource and the dedicated random access resource corresponds to the uplink carrier, the terminal device uses the dedicated random access resource to perform contention-free random access. Specifically, when there is one uplink carrier corresponding to the dedicated random access resource, the terminal device performs random access on the uplink carrier using the dedicated random access resource. When there is more than one uplink carrier corresponding to the dedicated random access resource, the terminal device performs random access on one of the at least two uplink carriers using the dedicated random access resource.

[0013] Optionally, the indication information includes a carrier index corresponding to the dedicated random access resource.

[0014] The determination by the terminal device based on the indication information of at least one uplink carrier corresponding to the dedicated random access resource includes:

determining, by the terminal device, the carrier indicated by the carrier index corresponding to the dedicated random access resource as at least one uplink carrier corresponding to the dedicated random access resource.

[0015] Thus, the uplink carrier corresponding to the dedicated random access resource can be explicitly indicated using the carrier index.

[0016] Optionally, there is a mapping between the dedicated random access resource and the uplink carrier on which the Physical Uplink Control Channel (PUCCH) resource is configured.

[0017] Based on the indication information of at least one uplink carrier corresponding to the dedicated random access resource, the terminal device determines:

determining, by the terminal device, based on the correspondence between the dedicated random access resource and the uplink carrier on which the PUCCH resource is configured, at least one uplink carrier corresponding to the dedicated random access resource.

[0018] Thus, the indication information can indirectly indicate, by indicating a correspondence between the dedicated random access resource and the uplink carrier on which the PUCCH resource is configured, the uplink carrier corresponding to the dedicated random access resource.

[0019] Optionally, the resource configuration information further includes a PUCCH resource, and the determination by the terminal device of one of the at least two uplink carriers as the target carrier includes:

determining, by the terminal device, one of the uplink carriers on which the PUCCH resource is configured of the at least two uplink carriers as the target carrier.

[0020] In other words, when the resource configuration information includes a dedicated random access resource and a PUCCH resource, the terminal device can determine, in accordance with the above principle, at least two uplink carriers corresponding to the dedicated random access resource, and determine the carrier uplink, on which the PUCCH resource is configured, of at least two uplink carriers as the target carrier.

[0021] Optionally, the resource configuration information further includes a random access share, and the method further includes:

if the device terminal fails to perform contention-free random access on the target carrier using the dedicated random access resource, the terminal device performs contention-based random access on the target carrier or another uplink carrier different from the target carrier using the shared random access resource.

[0022] Optionally, the resource configuration information includes a PUCCH resource, and determining, by the terminal device based on the resource configuration information of at least one uplink carrier, one uplink carrier from at least one uplink carrier in as a target carrier for performing random access includes:

determining, by the terminal device, one of the uplink carriers on which the PUCCH resource is configured from the at least one uplink carrier as the target carrier.

[0023] In other words, in this embodiment of the present application, when the resource configuration information does not include a dedicated random access resource but includes a PUCCH resource, the terminal device can determine one uplink carrier on which the PUCCH resource is configured from at least one uplink carrier as the target carrier, and perform contention-based random access on the uplink carrier using the shared random access resource.

[0024] Optionally, when there is one carrier on which the PUCCH resource is configured, the terminal device determines the uplink carrier on which the PUCCH resource is configured as the target carrier.

[0025] When there are at least two uplink carriers on which the PUCCH resource is configured, the terminal device determines the target carrier based on the cell measurement result.

[0026] Optionally, the resource configuration information includes a random access shared resource, and determining, by the terminal device, based on the resource configuration information, at least one uplink carrier, one uplink carrier of the at least one uplink carrier communication as a target carrier to perform random access includes:

determining, by the terminal apparatus, a target carrier of the at least one uplink carrier based on the cell measurement result.

[0027] In other words, when the resource configuration information does not include a dedicated random access resource or a PUCCH resource, that is, when the resource configuration information includes only a shared random access resource, or when the resource configuration information includes a dedicated random access resource , but the network device does not indicate, by using the above explicit or implicit method, the uplink carrier corresponding to the dedicated random access resource, the indication information sent by the network device may indicate the common random access resource of at least one uplink carrier. The terminal apparatus may determine the target carrier from the at least one uplink carrier based on the cell measurement result.

[0028] The measurement result of the cell in this case includes the measurement result of the downlink reference signal, and the downlink reference signal may include a synchronization signal (SS) (where SS includes a primary synchronization signal (PSS) /Secondary Synchronization Signal (SSS)) and/or Channel State Information Reference Signal (CSI-RS) and/or Physical Broadcast Channel-Demodulation reference signal (PBCH-DMRS) .

[0029] Optionally, the terminal device's determination of the target carrier based on the cell measurement result includes:

if the measurement result of the downlink reference signal is greater than or equal to the threshold value, determining, by the terminal device, the first uplink carrier as the target carrier; or

if the measurement result of the downlink reference signal is less than the threshold value, determining, by the terminal device, the second uplink carrier as the target carrier.

[0030] Optionally, the reconfiguration message used for synchronization further includes a threshold value, and the threshold value is used by the terminal device to determine the target carrier based on the measurement result of the downlink reference signal.

[0031] In this embodiment of the present application, the threshold value may be configured in any of the following three ways.

[0032] (1) The system message of the target network device may include a threshold value. The system message is, for example, RMSI. The threshold in this application may be the same as the threshold used during initial access, in other words, the threshold included in the system message is unique and may apply to both the uplink carrier selection performed during initial access. , and to the uplink carrier selection performed during handover. Alternatively, the threshold may be different from the threshold used during initial access, in other words, the system message includes two thresholds: One is used for uplink carrier selection performed during initial access, and the other is used for uplink carrier selection. communication lines during handover. It is understood that in this case, the handover message in this embodiment of the present application does not include a threshold value. In this case, the terminal device may select an uplink carrier based on a threshold included in a system message transmitted by the target network device.

[0033] (2) The handover message sent by the source network device to the terminal device may include a threshold value. In particular, the threshold value may be included in the RMSI, and optionally, the RMSI may be included in the handover message. In particular, the way in which the RMSI includes the threshold value can be described as the way (1). In this case, the terminal device may select the uplink carrier based on the threshold included in the handover message.

[0034] (3) The threshold value may be specified in the protocol.

[0035] Optionally, after the terminal device initiates random access on the target carrier by power ramping for X times, or after the terminal device fails to initiate random access on the target carrier for Y times, or after after the terminal device sends the random access preamble sequence on the target carrier for Z times, the terminal device performs random access on a different uplink carrier than the target carrier, where all of X, Y, and Z are positive integers greater than 1 .

[0036] According to a second aspect, an embodiment of the present application provides a communication method, including:

determining, by the network device, first indication information, where the first indication information is used to indicate resource configuration information of at least one uplink carrier, at least one uplink carrier includes a first uplink carrier and/or at least one second uplink carrier, the first uplink carrier and at least one second uplink carrier are different uplink carriers in a network device cell, and the first uplink carrier and at least one second uplink carrier correspond to the same downlink carrier communication lines in a cell; and

sending, by the network device, first indication information so that the terminal device determines one uplink carrier of the at least one uplink carrier as a target carrier for performing random access.

[0037] Therefore, in this embodiment of the present application, when a cell (i.e., a target cell) of a network device to which a terminal device is to be handed over includes a first uplink carrier and at least one second uplink carrier , and the first uplink carrier and at least one second uplink carrier correspond to one downlink carrier in the target cell, the network device can send to the terminal device resource configuration information of at least one uplink carrier including the first an uplink carrier and/or at least one second uplink carrier, so that the terminal device can determine, based on the resource configuration information of the at least one uplink carrier, one uplink carrier from the at least one uplink carrier as a target left carrier to perform random access.

[0038] The communication method in this embodiment of the present application can be applied to a handover scenario and a dual connectivity scenario. Specifically, in a handover scenario, the network device is the target network device, and the indication information may be included in the handover request response message and the handover message. In the dual connectivity scenario, the network device is the secondary base station, and indication information may be included in the secondary station addition request confirmation message and the RRC connection reconfiguration message.

[0039] It should be understood that the first uplink carrier and the second uplink carrier are uplink carriers with different frequency bands. For example, the first uplink carrier may be a high band uplink carrier deployed in the 5G NR system, and the uplink carrier may be referred to as an NR UL carrier, a PUL carrier, a normal UL carrier, or a conventional UL carrier. The second uplink carrier is a low band uplink carrier (for example, in an LTE system or other communication system) and may be used to assist the terminal apparatus in uplink transmission, and this uplink carrier may be referred to as a SUL carrier. .

[0040] Optionally, the first indication information is used to indicate resource configuration information of the target carrier, wherein

determining, by the network device, the first indication information includes: receiving, by the network device, a cell measurement result from the terminal device; and

determining, by the network device, a target carrier of the at least one uplink carrier based on the measurement result.

[0041] Optionally, the measurement result includes a measurement result of a downlink reference signal, and determining, by the network device, a target carrier of the at least one uplink carriers based on the measurement result, includes:

if the measurement result of the downlink reference signal is greater than or equal to the threshold value, determining, by the network device, the first uplink carrier in the at least one uplink carrier as the target carrier; or

if the measurement result of the downlink reference signal is less than the threshold value, determining, by the network device, the second uplink carrier in the at least one uplink carrier as the target carrier.

[0042] In particular, when the target network device supports at least two uplink carriers, the target network device may configure a dedicated random access resource for one of the uplink carriers. Alternatively, when the target network device supports at least two uplink carriers, the target network device may not configure dedicated random access resources, but configure a PUCCH resource for one of the uplink carriers.

[0043] Optionally, the resource configuration information includes a dedicated random access resource and/or a PUCCH resource, where

the first indication information includes a carrier index corresponding to the dedicated random access resource, and a carrier index corresponding to the dedicated random access resource is used to indicate at least one uplink carrier corresponding to the dedicated random access resource; or

there is a mapping between the dedicated random access resource and an uplink carrier on which a physical uplink control channel (PUCCH) resource is configured, and this mapping is used to indicate at least one uplink carrier corresponding to the dedicated random access resource.

[0044] Optionally, the first indication information further includes a random access share.

[0045] Optionally, there may be the following six possible cases in which the target network device configures a random access resource for the terminal device.

[0046] (1) The target network device supports two uplink carriers (one common UL carrier and one SUL carrier) and configures a dedicated random access resource for each of the two uplink carriers.

[0047] (2) The target network device supports two uplink carriers (one common UL carrier and one SUL carrier), and the target network device does not configure dedicated random access resources, but a PUCCH configuration for each of the uplink carriers.

[0048] (3) The target network device supports more than two uplink carriers (one common UL carrier and at least one SUL carrier), and the target network device configures a dedicated random access resource for each of the uplink carriers.

[0049] (4) The target network device supports more than two uplink carriers (one common UL carrier and at least one SUL carrier), and the second network device configures a dedicated random access resource for one or some (some of at least two uplink carriers) of the uplink carriers.

[0050] (5) The target network device supports more than two uplink carriers (one common UL carrier and at least one SUL carrier), and the second network device configures not dedicated random access resources, but a PUCCH configuration for each of the uplink carriers connections.

[0051] (6) The target network device supports more than two uplink carriers, and the target network device does not configure dedicated random access resources, but a PUCCH configuration for one or some of the uplink carriers.

[0052] Optionally, the network device sends second indication information to the terminal device, wherein the second indication information is used to indicate that after the terminal device initiates random access on the target carrier by power ramping for X times or after after the terminal device fails to initiate random access on the target carrier for Y times, or after the terminal device sends the random access preamble sequence on the target carrier for Z times, the terminal device performs random access on another uplink carrier that is different from the target carrier, where X, Y, and Z are all positive integers greater than 1.

[0053] According to a third aspect, a terminal device is provided and is configured to perform a method in any of the first aspect or possible implementations of the first aspect. In particular, the terminal device includes units configured to perform the method in any of the first aspect or possible implementations of the first aspect.

[0054] According to a fourth aspect, a network device is provided and configured to perform a method in any of the second aspect or possible implementations of the second aspect. In particular, the apparatus includes units configured to perform the method in any of the second aspect or possible implementations of the second aspect.

[0055] According to a fifth aspect, a terminal device is provided. The terminal device includes a transceiver, a memory, a processor, and a bus system. The transceiver, memory, and processor are connected using a bus system, the memory is adapted to store instructions, and the processor is configured to execute instructions stored in the memory to control the transceiver to receive and/or send a signal. In addition, when the processor executes an instruction stored in memory, such execution enables the processor to execute the method in any of the first aspect or possible implementations of the first aspect.

[0056] According to a sixth aspect, a network device is provided. The network device includes a transceiver, a memory, a processor, and a bus system. The transceiver, memory, and processor are connected using a bus system, the memory is adapted to store instructions, and the processor is configured to execute instructions stored in the memory to control the transceiver to receive and/or send a signal. In addition, when the processor executes an instruction stored in memory, such execution enables the processor to execute the method in any of the second aspect or possible implementations of the second aspect.

[0057] According to a seventh aspect, a computer-readable medium is provided that is used to store a computer program. The computer program includes instructions used to carry out the method in any possible implementation of any of the above aspects.

[0058] According to an eighth aspect, a computer program product is provided. The computer program product includes computer program code. When the computer program code is executed by a communication unit, a processing unit, or a transceiver or processor of a communication device (e.g., the aforementioned terminal device or the aforementioned network device), then the communication device is enabled to perform the method in any possible implementation of any of the above aspects.

[0059] According to a ninth aspect, a communication chip is provided. The communication chip stores the instructions, and when the instructions are executed on the communication device, the communication chip executes the method in any possible implementation of any of the above aspects.

[0060] According to a tenth aspect, a communication system is provided. The communication system includes the above terminal device and the above network device.

BRIEF DESCRIPTION OF THE DRAWINGS

[0061] FIG. 1 is a schematic diagram of a cell deployment in an NR system according to one embodiment of the present application;

[0062] FIG. 2 is a schematic flowchart of a communication method according to one embodiment of the present application;

[0063] Fig. 3 is a flowchart of another communication method according to one embodiment of the present application;

[0064] Fig. 4 is a flowchart of another communication method according to one embodiment of the present application;

[0065] Fig. 5 is a flowchart of another communication method according to one embodiment of the present application;

[0066] FIG. 6 is a flowchart of another communication method according to one embodiment of the present application;

[0067] FIG. 7 is a schematic block diagram of a terminal device according to one embodiment of the present application;

[0068] FIG. 8 is a schematic block diagram of another terminal device according to one embodiment of the present application;

[0069] Fig. 9 is a schematic block diagram of a network device according to one embodiment of the present application; and

[0070] FIG. 10 is a schematic block diagram of another network device according to one embodiment of the present application.

Description of Embodiments

[0071] The technical solutions of the present application will now be described with reference to the accompanying drawings.

[0072] The technical solutions in the embodiments of the present application can be applied to various communication systems, for example, the Long Term Evolution (LTE) system, the Frequency Division Duplex (FDD) LTE system, the LTE Time Division Duplex (TDD), Universal Mobile Telecommunications System (UMTS), and the future 5th Generation (5G) system such as New Radio (NR).

[0073] The terminal device in embodiments of the present application may be a user equipment, an access terminal, a user equipment, a subscriber station, a mobile station, a mobile console, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent , user device, or the like; or may be a cellular phone, cordless phone, Session Initiation Protocol (SIP) phone, Wireless Local Loop (WLL) station, Personal Digital Assistant (PDA), portable device having a wireless communication function, computing device, another processing device connected to a wireless modem, a device in a vehicle, a wearable device, a terminal device in a future 5G network, or a terminal device in a future Public Land Mobile Network (PLMN). In embodiments of the present application, this is not limited.

[0074] The network device in the embodiments of the present application may be a device capable of communicating with a terminal device, may be an evolutionary NodeB (Evolutionary NodeB, eNB or eNodeB) in an LTE system; may be a radio controller in a Cloud Radio Access Network (CRAN) scenario; or it may be a relay node, an access point, an in-vehicle device, a wearable device, a network device in a future 5G network, a network device in a future advanced PLMN, or the like. For example, the network device may be a base station gNB device in an NR system. In embodiments of the present application, this is not limited.

[0075] The source network device in the embodiments of the present application is a network access device that the terminal is currently accessing or connecting to, and the service of the terminal can be transferred from the network access device to another network access device. Accordingly, the target network device in the embodiments of the present application is a network access device to which the terminal is to be handed over.

[0076] It should be understood that the term "and/or" in this specification only describes an association relationship for describing related objects, and represents that three relationships may exist. For example, A and/or B can represent the following three cases: Only A exists, both A and B exist, and only B exists. In addition, the "/" symbol in this specification indicates an "or" relationship between associated objects.

[0077] In embodiments of the present application, "multiple" means two or more than two.

[0078] Descriptions such as "first" and "second" in the embodiments of the present application are simply used as an example and are used to distinguish between different objects, but are not intended to describe a specific order, do not indicate a specific limitation on the number of devices in the embodiments. of the present application, and do not impose any restrictions on the embodiments of the present application.

[0079] "Connection" in the embodiments of the present application includes various connection methods, such as direct connection or indirect connection, for communication between devices. In embodiments of the present application, this is not limited.

[0080] FIG. 1 is a schematic diagram of a cell deployment in an NR system according to one embodiment of the present application. In Fig. 1, area 1 is the downlink coverage area of the RF cell, area 2 is the uplink coverage area of the RF cell, the size of area 1 is different from the size of area 2, and the coverage area of area 2 is smaller than the coverage area of area 1 In particular, for downlink transmission of a high frequency cell, the transmission power of a network device is generally not limited. Therefore, the network device can use more transmit power to send in order to increase the coverage area of the downlink. However, due to the limitation of the maximum transmission power and the like, the terminal apparatus cannot increase the uplink coverage area by increasing the transmission power. Therefore, the uplink coverage area of the RF cell is incompatible with the downlink coverage area of the RF cell. In this embodiment of the present application, the downlink carrier in region 1 may be referred to as an NR downlink carrier (NR DL) carrier, and the uplink carrier in region 2 may be referred to as an NR uplink carrier (NR Uplink, NR UL) carrier), PUL carrier, regular UL carrier, general UL carrier, or SUL carrier. To describe this method, the following is a description using a common UL carrier.

[0081] Region 3 in FIG. 1 is the coverage area of the SUL carrier, and the coverage area of region 3 is the same or similar to the coverage area of region 1. The SUL carrier has an uplink bandwidth with a frequency lower than that of the common UL carrier. Therefore, the signal attenuation in region 3 is smaller than in region 2, and the terminal device can send a signal using a relatively low transmit power. In this case, the terminal device has two spectra for uplink transmission. In particular, the terminal apparatus may perform uplink transmission using the SUL carrier and the common UL carrier. In other words, a cell that supports the SUL configuration has one downlink carrier and two uplink carriers.

[0082] It should be understood that only the application scenario in Figure 1 is used as an example for description in this embodiment of the present application. However, this embodiment of the present application is not limited thereto. For example, the cell may further include another SUL carrier, in other words, a terminal device in the cell that supports the SUL configuration may perform uplink transmission using one common UL carrier and at least one SUL carrier.

[0083] FIG. 2 is an interaction diagram of a communication method according to one embodiment of the present application. The communication method may be used in a process in which a terminal device is handed over from a source base station (source gNB) to a target base station (target gNB). It should be understood that the NR system is used as an example to describe in this embodiment of the present application, but the technical solution in this embodiment of the present application is not limited to the 5G system. Also, in this embodiment of the present application, the network device/terminal device may perform some or all of the steps in the foregoing embodiment, and these steps or operations are merely examples. Other operations or variants of operations may alternatively be performed in this embodiment of the present application. In addition, the steps may be performed in a different order from the sequence shown in the previous embodiment, and it may not be necessary to perform all operations in the above embodiment.

[0084] 210. The network device sends indication information to the terminal device, wherein the indication information is used to indicate resource configuration information of at least one uplink carrier.

[0085] A network device in this document is a target network device or a source network device. The target network device may be the target base station, namely the aforementioned target gNB, and the source network device may be the source base station, namely the aforementioned source gNB. Specifically, the indication information may be included in a handover request confirmation message sent by the target network device to the source network device. The source network device sends a handover message to the terminal device. The handover message includes indication information. In other words, the target network device may first send the indication information to the source network device, and then the source network device transparently transmits the indication information to the terminal device.

[0086] In other words, in this embodiment of the present application, the indication information may be included in the handover response confirmation message and the handover message. In particular, the handover message may be a Radio Resource Control (RRC) connection reconfiguration message including mobility control info, or another message used to instruct the terminal device to need to handover/change the serving cells/sync reconfiguration.

[0087] Specifically, the terminal device sends the measurement report to the source network device, and the source network device performs handover determination based on the measurement report reported by the terminal device or other information, and determines the target cell to which the terminal device is handed over. Then, the terminal device sends a handover request message to the network device (target network device) to which the target cell belongs. After performing admission control (eg, resource configuration) based on the received handover request message, the target network device responds to the source network device with a handover request confirmation message. After receiving the handover request confirmation message, the source network device sends a handover message to the terminal device.

[0088] In this embodiment of the present application, at least one uplink carrier is an uplink carrier in the target cell to which the terminal device is to be handed over, namely an uplink carrier in the cell of the target network device to which the terminal device is to be handed over. service of the terminal device is transferred. Furthermore, more specifically, the at least one uplink carrier includes a first uplink carrier and/or at least one second uplink carrier, the first uplink carrier and at least one second uplink carrier are different uplink carriers in the target cell to which the terminal apparatus is to be handed over, and the first uplink carrier and at least one second uplink carrier correspond to the same downlink carrier in the target cell.

[0089] It should be understood that the first uplink carrier and the second uplink carrier are uplink carriers with different frequency bands. For example, the first uplink carrier may be a high band uplink carrier deployed in an NR system, namely an NR UL carrier, a PUL carrier, a conventional UL carrier, or a common UL carrier as described above. The second uplink carrier is an uplink carrier in a low frequency band (eg, in an LTE system or other communication system) and may be used to assist the terminal device in uplink transmission, namely the SUL carrier described above. Therefore, in this embodiment of the present application, the terminal apparatus may have two spectrums for uplink transmission, and the coverage area of the first uplink carrier is smaller than the coverage area of the second uplink carrier. Specifically, for a description of the service area of the first uplink carrier and the coverage area of the second uplink carrier, refer to the description in FIG. To avoid repetition, the details are not described again.

[0090] In addition, in this embodiment of the present application, the downlink carrier, the first uplink carrier, and at least one second uplink carrier are configured in the target cell, and the first uplink carrier and at least one second carrier uplink correspond to one downlink carrier in the target cell. It is understood that the coverage area of the downlink carrier is the same or similar to the coverage area of one of the at least one SUL carrier corresponding to the downlink carrier. For example, when there is only one SUL carrier, the coverage area of the downlink carrier is the same or similar to the coverage area of the SUL carrier. In addition, the downlink carrier bandwidth is the same or similar to the uplink first carrier bandwidth, and at least one second uplink carrier is a carrier used to assist the terminal apparatus in uplink transmission, where the bandwidth is at least one second uplink carrier may be lower than the bandwidth of the downlink carrier or the first uplink carrier.

[0091] Optionally, the indication information is carried in the reconfiguration message used for synchronization, and the reconfiguration message used for synchronization includes said first uplink carrier configuration information and said second uplink carrier configuration information, or the reconfiguration message used for synchronization includes configuration information of the first uplink carrier or configuration information of the second uplink carrier.

[0092] Optionally, the uplink first carrier configuration information includes at least one of a physical uplink shared channel (PUSCH) configuration, a physical uplink control channel (PUCCH) configuration, a sounding reference signal configuration ( SRS) and the uplink power control configuration of the first uplink carrier. The uplink second carrier configuration information includes at least one of a physical uplink shared channel (PUSCH) configuration, a physical uplink control channel (PUCCH) configuration, a sounding reference signal (SRS) configuration, and an uplink power control configuration. the communication link of the second uplink carrier.

[0093] Optionally, the resource configuration information includes a random access dedicated resource (RACH dedicated resource). The dedicated random access resource may be used by the terminal device to initiate contention-free random access (contention-free RA/CFRA). Specifically, the dedicated random access resource includes a preamble index and a time-frequency resource.

[0094] Specifically, when the resource configuration information includes a dedicated random access resource, the target network device can configure one dedicated random access resource for one common UL carrier and/or at least one SUL carrier. Alternatively, the target network device may configure a dedicated random access resource for both the common UL carrier and/or the at least one SUL carrier.

[0095] In a particular implementation, the indication information may include a carrier index corresponding to the dedicated random access resource. In particular, the carrier index may explicitly indicate the correspondence between the random access resource and the uplink carrier, that is, explicitly indicate the uplink carrier index number corresponding to the dedicated random access resource. Thus, the terminal apparatus can determine, based on the carrier index corresponding to the dedicated random access resource, the uplink carrier corresponding to the dedicated random access resource.

[0096] For example, in a scenario in which only one SUL carrier is considered, the SUL index value of the carrier is 1. In particular, a system message, RRC signaling, or protocol indicates (i.e., logs) the carrier index value. The indication information may include a dedicated random access resource, and the dedicated random access resource configuration information element includes a carrier index value of 1. In this case, the indication information is used to indicate that the uplink carrier corresponding to the dedicated random access resource is the SUL carrier #1.

[0097] For another example, the indication information may include dedicated random access resource #1. The carrier indices of the dedicated random access resource #1 are 0, 2 and 3, b carrier indices 0, 2 and 3 respectively correspond to the common UL carrier, the SUL carrier #1 and the SUL carrier #3. In this case, the indication information is used to indicate that the uplink carriers corresponding to dedicated random access resource #1 are common UL carrier, SUL carrier #1, and SUL carrier #3, in other words, the target network device allocates the same dedicated random access resource #1 of the common UL carrier, SUL carrier #1, and SUL carrier #3.

[0098] In another example, in a scenario that considers common UL carrier #1, SUL carrier #2, and SUL carrier #4, specifically, a system message, RRC signaling, or protocol write carrier index values, the indication information includes a dedicated resource Random access dedicated resource #1, random access dedicated resource #2, and random access dedicated resource #3, wherein the configuration information item of random access dedicated resource #1 includes a carrier index value of 1, in other words, the indication information is used to indicate that the carrier the uplink corresponding to dedicated random access resource #1 is the common UL carrier #1; the random access dedicated resource #2 configuration information element includes a carrier index value of 2, in other words, the indication information is used to indicate that the uplink carrier corresponding to the random access dedicated resource #2 is the SUL carrier #2; and the random access dedicated resource #3 configuration information element includes a carrier index value of 4, in other words, the indication information is used to indicate that the uplink carrier corresponding to random access dedicated resource #3 is the SUL carrier #4.

[0099] In another specific implementation, the resource configuration information may further include a PUCCH resource. In this case, there may be a correspondence between the dedicated random access resource and the uplink carrier on which the physical uplink control channel (PUCCH) resource is configured, i.e., the dedicated random access resource corresponds to the uplink carrier on which the PUCCH resource is configured. In other words, the indication information may implicitly indicate the uplink carriers corresponding to the dedicated random access resource.

[0100] For example, the indication information may include dedicated random access resource #1, and the network device configures the PUCCH resource for UL common carrier, SUL carrier #1, and SUL carrier #3. The network device implicitly indicates that the uplink carriers corresponding to random access dedicated resource #1 are UL common carrier, SUL carrier #1, and SUL carrier #3, that is, the target network device allocates random access dedicated resource #1 to the common UL carrier, SUL of carrier #1 and SUL of carrier #3.

[0101] In another particular implementation, an information element, such as ra-PRACH-MaskIndex, may be used to indicate an uplink carrier corresponding to a dedicated random access resource. For example, a reserved index (index) in a masking index is used to specify. Optionally, the ra-PRACH-MaskIndex may be included in the dedicated random access resource, and the dedicated random access resource configuration information is included in the handover message.

[0102] Alternatively, the number of mask indexes in the ra-PRACH-MaskIndex may be expanded, and the expanded mask index is used to indicate the uplink carrier corresponding to the dedicated random access resource. In particular, the existing masking indices are only 0 to 15, and the masking indices used for designation may be directly specified in the protocol.

[0103] Alternatively, the mapping between the dedicated random access resource and the uplink carrier may be indicated using ra-PRACH-MaskIndex. For example, a mask index may be used to match the carrier index.

[0104] In another particular implementation, the protocol may specify that the dedicated random access resource may correspond to any default uplink carrier.

[0105] Thus, the target network device can allocate a dedicated random access resource for at least one uplink carrier in the aforementioned several ways. Accordingly, the terminal apparatus can determine, based on the indication information, at least one uplink carrier corresponding to the dedicated random access resource.

[0106] Optionally, the resource configuration information may include a random access share, and the random access share may be used by the terminal device to initiate content-based random access (CBRA). In particular, the handover message may include a random access channel (RACH) configuration, and the RACH configuration may include a random access shared resource. Perhaps the random access common resource corresponds to one common UL carrier and/or at least one SUL carrier. Another possible method is a plurality of shared random access resources, which respectively correspond to one common UL carrier and/or at least one SUL carrier.

[0107] Specifically, when the resource configuration information includes a dedicated random access resource, the terminal device preferably initiates random access on the dedicated random access resource. When the resource configuration information does not include the dedicated random access resource or the terminal device fails to initiate contention-free random access on the dedicated random access resource, the terminal device may initiate random access on the shared random access resource.

[0108] 220. Based on the resource configuration information of the at least one uplink carrier, the terminal device determines one uplink carrier of the at least one uplink carrier as a target carrier for performing random access. Thus, the target carrier herein is the first uplink carrier or the second uplink carrier described above. In other words, the target carrier is an uplink carrier in the target cell to which the terminal apparatus is to be handed over, namely, the target carrier is a common UL carrier or SUL carrier.

[0109] In a specific implementation, when the resource configuration information includes a dedicated random access resource, the terminal device can determine, based on the indication information, at least one uplink carrier corresponding to the dedicated random access resource.

[0110] In one example, the terminal device determines the carrier indicated by the carrier index corresponding to the dedicated random access resource as at least one uplink carrier corresponding to the dedicated random access resource.

[0111] In another example, the terminal device determines, based on the correspondence between the dedicated random access resource and the uplink carrier on which the PUCCH resource is configured, the uplink carrier on which the PUCCH resource is configured as at least one uplink carrier. corresponding to the dedicated random access resource.

[0112] In another example, the terminal device may determine, based on the mask index pointer bit in ra-PRACH-MaskIndex, at least one uplink carrier corresponding to the dedicated random access resource.

[0113] In another example, the terminal device may by default consider that the dedicated random access resource may correspond to any uplink carrier.

[0114] In this embodiment of the present application, when at least one uplink carrier corresponding to the dedicated random access resource includes one uplink carrier, the terminal device determines the uplink carrier as the target carrier and initiates random access on the target carrier. In other words, in this case, the target network device configures the dedicated random access resource for only one uplink carrier (more precisely, a common UL carrier or SUL carrier); the terminal device initiates random access using a dedicated random access resource corresponding to the uplink carrier.

[0115] When at least one uplink carrier corresponding to the dedicated random access resource includes at least two (i.e., multiple) uplink carriers, the terminal device determines one of the at least two uplink carriers in as the target carrier and initiates random access on the target carrier using the dedicated random access resource. In other words, in this case, the target network device configures a dedicated random access resource for multiple uplink carriers (one common UL carrier and/or at least one SUL carrier).

[0116] In this case, the terminal device may determine the target carrier based on the PUCCH resource in the resource configuration information. Specifically, the terminal apparatus may determine one of the uplink carriers on which the PUCCH resource is configured from among the at least two uplink carriers as the target carrier.

[0117] Specifically, in this case, if the target network device configures the PUCCH resource for only one of the uplink carriers on which the dedicated random access resource is configured, the terminal device performs random access using the dedicated random access resource corresponding to the carrier on which the dedicated random access resource and the PUCCH resource are configured. If the target network device configures the PUCCH resource for more of the plurality of uplink carriers on which the dedicated random access resource is configured, the terminal device may perform random access using the dedicated random access resource corresponding to one of the plurality of uplink carriers on which the dedicated random access resource is configured. a dedicated random access resource; and a PUCCH resource.

[0118] In another specific embodiment, when the resource configuration information includes a PUCCH resource, the terminal device determines one of the uplink carriers on which the PUCCH resource is configured of at least one uplink carrier as the target carrier. Specifically, in this case, the handover request response or handover message does not include a dedicated random access resource, but the handover request response or handover message includes a shared random access resource. If the indication information includes a PUCCH resource of one uplink carrier, the terminal device performs, by using the shared random access resource, contention-based random access on the uplink carrier on which the PUCCH resource is configured. If the response to the handover request or the handover message includes a PUCCH resource capable of multiple uplink carriers, the terminal device can perform, by using a shared random access resource, contention-based random access on one of the multiple uplink carriers. link on which the PUCCH resource is configured.

[0119] Optionally, in this embodiment of the present application, when there are at least two uplink carriers on which a PUCCH resource is configured, the terminal device may randomly select an uplink carrier from at least two uplink carriers on which the PUCCH resource is configured as a target carrier for performing random access, or the terminal device may select an uplink carrier based on a sequence configured by the network device. For example, the terminal device may determine the first uplink carrier on which the PUCCH resource is configured (or on which the dedicated random access resource and the PUCCH resource are configured) in the designation information as a target carrier for performing random access.

[0120] Optionally, in this embodiment of the present application, when there are at least two uplink carriers on which the PUCCH resource is configured, the terminal device determines, based on the measurement result of the target cell, the target carrier of the at least two carriers. uplink on which the PUCCH resource is configured.

[0121] Optionally, in this embodiment of the present application, the resource configuration information includes a random access shared resource, and that the terminal device determines, based on the resource configuration information of at least one uplink carrier, one uplink carrier from at least one uplink carrier as a target carrier for performing random access, includes: determining by the terminal device a target carrier of the at least one uplink carrier based on the measurement result of the target cell.

[0122] In other words, when the resource configuration information does not include a dedicated random access resource or a PUCCH resource, that is, the resource configuration information includes only a shared random access resource, or when the resource configuration information includes a dedicated random access resource, but the network device does not indicate, using the above explicit or implicit method, the uplink carrier corresponding to the dedicated random access resource, the indication information sent by the network device may indicate the common random access resource of at least one uplink carrier. The terminal apparatus may determine the target carrier from the at least one uplink carrier based on the measurement result of the target cell.

[0123] The cell measurement result here is the cell level measurement result of the cell and/or the cell signal measurement result. The signal measurement result includes the measurement result of the downlink reference signal. The downlink reference signal may include SS (including Primary Synchronization Signal (PSS)/Secondary Synchronization Signal (SSS)) and/or CSI-RS and/or PBCH-DMRS. Thus, the existing cell measurement method is used during the measurement, for example, the cell measurement technology in the LTE system: The terminal device obtains the cell level measurement result of the serving cell and/or the neighboring cell through measurement based on the measurement configuration. In another possible way, since the concept of a beam is introduced in the new 5G radio technology, the cell level measurement result may be a measurement result obtained by averaging the measurement results of one or more beams in a cell. Specifically, the measurement result of the downlink reference signal includes a received reference signal received power (RSRP) and a received reference signal received quality (RSRQ).

[0124] Optionally, in this embodiment of the present application, the reconfiguration message used for synchronization further includes a threshold value, and the threshold value is used by the terminal device to determine the target carrier based on the measurement result of the downlink reference signal.

[0125] In this embodiment of the present application, the threshold value may be configured in any of the following three ways. It is understood that the following three methods are used only as examples for description and do not impose any restrictions on this embodiment of the present application.

[0126] (1) The system message of the target network device may include a threshold value. The system message is, for example, RMSI. Currently, in the standard, the threshold used to select the uplink carrier during initial access is included in the system message. The threshold in this application may be the same as the threshold used during initial access, in other words, the threshold included in the system message is unique and may apply to both the uplink carrier selection performed during initial access. , and to the uplink carrier selection performed during handover. Alternatively, the threshold may be different from the threshold used during initial access, i.e. the system message includes two thresholds: one is used to select the uplink carrier during initial access and the other is used to select the uplink carrier during initial access. handover time.

[0127] It is understood that in this case, the handover message in this embodiment of the present application does not include a threshold value. In this case, the terminal device may select an uplink carrier based on a threshold included in a system message transmitted by the target network device.

[0128] (2) The handover message sent by the source network device to the terminal device may include a threshold value. In particular, the threshold value may be included in the RMSI, and the RMSI is optionally included in the handover message. In particular, the way in which the RMSI includes the threshold value can be described as the way (1). In this case, the terminal device may select the uplink carrier based on the threshold included in the handover message.

[0129] (3) The threshold value may be pre-configured for the terminal device.

[0130] In this embodiment of the present application, if the measurement result of the downlink reference signal is greater than or equal to the threshold value, then the terminal apparatus determines the first uplink carrier as the target carrier; or if the measurement result of the downlink reference signal is less than the threshold value, the terminal apparatus determines the second uplink carrier as the target carrier. Here, the first uplink carrier is the common UL carrier described above, and the second uplink carrier is the SUL carrier described above.

[0131] Optionally, the terminal device may select an uplink carrier using any of the following two methods. It is understood that the following two methods are used only as examples for description and do not impose any restrictions on this embodiment of the present application.

[0132] (1) There are two uplink carriers (and the two uplink carriers are the first uplink carrier and the second uplink carrier).

[0133] In this case, if RSRP or RSRQ is greater than or equal to the threshold value, the terminal device performs random access on the first uplink carrier; or if RSRP or RSRQ is less than a threshold, the terminal device performs random access on the second uplink carrier.

[0134] (2) There are more than two uplink carriers (and at least two uplink carriers are a first uplink carrier and at least two second uplink carriers):

[0135] In this case, if the threshold is preconfigured, or the system message or the handover message includes the threshold, when RSRP or RSRQ is greater than or equal to the threshold, the terminal device performs random access on the first uplink carrier; or when RSRP or RSRQ is less than a threshold, the terminal device performs random access on any of the at least two second uplink carriers.

[0136] If two thresholds are specified in the protocol or the system message includes two thresholds, the terminal device may determine, based on the two thresholds and the measurement result, one of the plurality of uplink carriers to perform random access. In particular, the network device may indicate the correspondence between the two thresholds and the uplink carrier selection (which may alternatively be indicated in the protocol or indicated in a system or handover message). For example, the two thresholds may be a first threshold (threshold 1) and a second threshold (threshold 2), and more than two uplink carriers may include a common UL1, SUL1, and SUL2. When RSRP or RSRQ is less than threshold 1, the terminal device selects SUL1 to perform random access; when RSRP or RSRQ is greater than threshold 1 and less than threshold 2, the terminal device selects SUL2 to perform random access; or when RSRP or RSRQ exceeds a threshold value of 2, the terminal device selects a common UL1 to perform random access.

[0137] If the terminal device fails to perform contention-free random access on the target carrier using the dedicated random access resource, the terminal device may perform contention-based random access on the target carrier or another uplink carrier different from the target carrier using the shared resource random access. In particular, the other uplink carrier may be a different uplink carrier than the target carrier, and optionally, the PUCCH resource may be configured to be a different uplink carrier.

[0138] When the resource configuration information does not include a dedicated random access resource but includes a shared random access resource, the terminal device may initiate, by using the shared random access resource, contention-based random access (CBRA) on the target carrier.

[0139] Optionally, in this embodiment of the present application, the handover message may further include second indication information. The second indication information is used to indicate that after the terminal device initiates random access on the target carrier by power ramping for X times (in other words, after the terminal device performs power ramping on the target carrier for X-1 times), or after the terminal device fails to initiate random access on the target carrier for Y times, or after the terminal device has sent a random access preamble sequence on the target carrier for Z times , the terminal device will perform random access on a different uplink carrier than the target carrier, where all of X, Y, and Z are positive integers greater than 1.

[0140] It is understood that when the terminal device initiates random access on the target carrier through power ramping, the terminal device can perform random access using relatively low transmission power for the first time. When the first random access fails, the terminal apparatus may increase the transmission power in the first step, and then perform random access on the target carrier for the second time using the increased transmission power. After the terminal device increases the transmission power by X-1 times (in other words, random access is performed for X times) in the above manner, the terminal device can perform random access on a different uplink carrier than the target carrier.

[0141] In addition, when the terminal device fails to initiate random access on the target carrier for Y times, Y may be the maximum number of random access initiation failures specified in the protocol. Alternatively, Y may be the number of times indicated by the second indication information, and this number of times may be less than or equal to the maximum number of random access initiation failures indicated in the protocol. In addition, a case in which random access fails after power ramping is performed a plurality of times in the random access process can be regarded as a random access failure process. This is not limited in this embodiment of the present application.

[0142] Accordingly, after the terminal device initiates random access on the target carrier by power ramping for X times, or after the terminal device fails to initiate random access on the target carrier for Y times, or the terminal device sends preamble random access sequence on the target carrier for Z times, the terminal device performs random access on a different uplink carrier than the target carrier.

[0143] It should be noted that in this embodiment of the present application, before the terminal device performs random access on another uplink carrier different from the target carrier, the terminal device may fail to perform random access on the dedicated random access resource or the shared resource. random access.

[0144] Therefore, in this embodiment of the present application, when the target cell to which the terminal apparatus is to be handed over includes the first uplink carrier and at least one second uplink carrier, and the first uplink carrier and at least one second uplink carrier corresponds to one downlink carrier in the target cell, the network device can send resource configuration information of at least one uplink carrier including the first uplink carrier and/or the second uplink carrier to the terminal device, so that the terminal device can, based on the resource configuration information of the at least one uplink carrier, determine one of the at least one uplink carrier as a target carrier for performing random access.

[0145] It should be understood that the network device herein may be a target network device or a source network device. Specifically, the target network device may send a handover request response that includes resource configuration information to the source network device. After receiving the handover request response, the source network device sends a handover message to the terminal device, the handover message including resource configuration information.

[0146] FIG. 3 is a schematic block diagram of an interaction of another communication method according to one embodiment of the present application. It should be understood that Fig. 3 shows the steps or operations of a communication method. However, these steps or operations are only examples. Other operations or variants of operations in Figure 3 may alternatively be performed in this embodiment of the present application. In addition, the steps in Fig. 3 may be performed in a different sequence from that shown in Fig. 3 and it is possible that not all of the operations in Fig. 3 need to be performed.

[0147] 310. The terminal device sends a measurement report to the source network device (eg, source gNB).

[0148] Specifically, the terminal device measures the serving cell and/or the neighbor cell and sends a measurement report to the source network device. The measurement report includes a measurement result of the serving cell and/or neighbor cell. In particular, for the cell measurement result, refer to the description in Fig.2. To avoid repetition, the details are not described again.

[0149] After performing the handover determination based on the measurement report reported by the terminal device or other information and determining the target cell, the source network device sends a handover request message to the network device to which the target cell belongs, namely to the target network device.

[0150] 320. The source network device sends a handover request to the target network device, wherein the handover request includes the measurement result reported by the terminal device in the measurement report, the measurement result includes the measurement result of the target cell, and optionally , includes the signal measurement result of the target cell.

[0151] In particular, the measurement result may be included in the RRC container of the handover request message, or the measurement result may be an interface information element for the Xn interface, and this information element is included in the handover request message.

[0152] 330. The target network device determines the uplink carrier configuration based on the threshold value and the measurement result.

[0153] Specifically, the uplink carrier configuration includes resource configuration information of at least one uplink carrier. The at least one uplink carrier herein includes a first uplink carrier and/or at least one second uplink carrier (in particular, a common UL carrier and at least one SUL carrier). In particular, for a description of the first uplink carrier and the second uplink carrier, refer to the previous descriptions. To avoid repetition, the details are not described again.

[0154] In this embodiment of the present application, the uplink carrier configuration includes uplink carrier resource configuration information, and the resource configuration information may include a dedicated random access resource and/or a PUCCH resource.

[0155] In particular, when the target network device supports at least two uplink carriers, the target network device may configure a dedicated random access resource for one of the uplink carriers. In a specific implementation, when the measurement result, RSRP or RSRQ, of the target cell is greater than or equal to the threshold value, the target network device configures a dedicated random access resource for the first uplink carrier. When the measurement result, RSRP or RSRQ, of the target cell is less than the threshold value, the target network device configures a dedicated random access resource for one of the at least one second uplink carrier. Optionally, in this case, the network device may further configure a PUCCH resource for the uplink carrier.

[0156] Alternatively, when the target network device supports at least two uplink carriers, the target network device may not configure dedicated random access resources, but configure a PUCCH resource for one of the uplink carriers. In a specific implementation, when the measurement result, RSRP or RSRQ, of the target cell is greater than or equal to the threshold value, the target network device configures a PUCCH resource for the first uplink carrier. When the measurement result, RSRP or RSRQ, of the target cell is less than the threshold value, the target network device configures a PUCCH resource for one of the at least one second uplink carrier.

[0157] Optionally, there may be the following six possible cases in which the target network device configures a random access resource for the terminal device.

[0158] (1) The target network device supports two uplink carriers (one common UL carrier and one SUL carrier) and configures a dedicated random access resource for each of the two uplink carriers.

[0159] (2) The target network device supports two uplink carriers (one common UL carrier and one SUL carrier), and the target network device does not configure dedicated random access resources, but a PUCCH configuration for each of the uplink carriers.

[0160] (3) The target network device supports more than two uplink carriers (one common UL carrier and at least one SUL carrier), and the target network device configures a dedicated random access resource for each of the uplink carriers.

[0161] (4) The target network device supports more than two uplink carriers (one common UL carrier and at least one SUL carrier), and the second network device configures a dedicated random access resource for one or some (some of at least two uplink carriers) of the uplink carriers.

[0162] (5) The target network device supports more than two uplink carriers (one common UL carrier and at least one SUL carrier), and the second network device configures not dedicated random access resources, but a PUCCH configuration for each of the uplink carriers connections.

[0163] (6) The target network device supports more than two uplink carriers, and the target network device does not configure dedicated random access resources, but a PUCCH configuration for one or some of the uplink carriers.

[0164] Optionally, in this embodiment of the present application, the handover message may further include second indication information. The second indication information is used to indicate that after the terminal device initiates random access on the target carrier by power ramping for X times (in other words, after the terminal device performs power ramping on the target carrier for X-1 times), or after the terminal device fails to initiate random access on the target carrier for Y times, or after the terminal device has sent the random access preamble sequence on the target carrier for Z times, the terminal device will perform random access on a different uplink carrier than the target carrier, where X, Y, and Z are all positive integers greater than 1.

[0165] 340. The target network device sends a handover request response to the source network device, where the handover request response includes uplink carrier resource configuration information determined by the target network device.

[0166] 350. The source network device sends a handover message to the terminal device, wherein the handover message includes uplink carrier resource configuration information determined by the target network device.

[0167] In particular, for resource configuration information at steps 340 and 350, see the description of step 330. To avoid repetition, details are not described again.

[0168] After receiving the resource configuration information sent by the source network device of at least one uplink carrier, the operation of the terminal device may change depending on another resource configuration case.

[0169] In one example, if the resource configuration information of at least one uplink carrier includes a dedicated random access resource of the uplink carrier, the terminal device may preferably perform random access using the dedicated random access resource corresponding to the carrier. If random access fails, the terminal device continues to perform random access on the carrier using the random access share. In addition, if the terminal device fails to perform contention-based random access on a carrier using the random access share, the terminal device may perform contention-based random access on another uplink carrier other than this carrier using the random access share. .

[0170] In another example, if the resource configuration information of at least one uplink carrier does not include any dedicated random access resource, but includes a PUCCH configuration of one of the uplink carriers, the terminal device may execute, by using a shared random access resource, contention-based random access only on the uplink carrier on which the PUCCH configuration is configured. In the event of a contention-based random access failure, the terminal device may initiate an RRC connection re-establishment procedure or perform random access using a random access shared resource of another uplink carrier.

[0171] In another example, for case (1) of the above six cases, if the target network device configures a dedicated random access resource for each of the uplink carriers, the terminal device may use any of the following four methods:

(1) performing a selection based on a sequence configured by the target network device;

(2) performing an arbitrary choice;

(3) it is preferable to use the dedicated random access resource that arrives first and select an uplink carrier corresponding to the dedicated random access resource; and

(4) if the target network device provides a different threshold (different from the threshold used by the network side to perform the determination, for example, the handover request response message and the handover message include a different threshold), the terminal device performs a re-determination based on the threshold value and the measurement result of the target cell, where, in particular, when the measurement result, RSRP or RSRQ, of the downlink signal of the target cell is greater than or equal to the threshold value, random access is performed using a dedicated random access resource corresponding to the first uplink carrier (common UL carrier), or if the measurement result, RSRP or RSRQ, of the downlink signal of the target cell is less than a threshold value, random access is performed using a dedicated random access resource corresponding to the second an uplink carrier (SUL carrier); or when the handover request response message/handover message does not include the threshold value, the terminal apparatus again performs determination based on the threshold value in the RMSI and the measurement result of the target cell.

[0172] In another example, for case (2) of the above six cases, if the target network device supports two uplink carriers (NR UL carrier and SUL carrier), and the target network device does not configure any dedicated random access resources, but configures the configuration PUCCH for both uplink carriers, the terminal device may use any of the following four methods:

(1) performing a selection based on a sequence configured by the target network device;

(2) performing an arbitrary choice;

(3) it is preferable to use the random access common resource that arrives first and select an uplink carrier corresponding to the random access common resource; and

(4) if the target network device provides a different threshold (different from the threshold used by the network side to perform the determination, for example, the handover request response message and the handover message include a different threshold), the terminal device performs a re-determination based on the threshold value and the measurement result of the target cell, where, in particular, when the measurement result, RSRP or RSRQ, of the downlink signal of the target cell is greater than or equal to the threshold value, random access is performed using the random access common resource corresponding to the first uplink carrier (UL common carrier), or if the measurement result, RSRP or RSRQ, of the downlink signal of the target cell is less than the threshold value, random access is performed using the common random access resource corresponding to the second uplink carrier zi (SUL carrier); or when the handover request response message/handover message does not include the threshold value, the terminal device again performs determination based on the threshold value in RMSI and the measurement result of the target cell.

[0173] In another example, for case (3) of the above six cases, if the target network device supports more than two uplink carriers (one NR UL carrier and at least one SUL carrier), and the target network device configures dedicated resources of an arbitrary access for all uplink carriers, the terminal device may use any of the following four methods:

(1) performing a selection based on a sequence configured by the target network device;

(2) performing an arbitrary choice;

(3) it is preferable to use a dedicated random access resource that arrives first and select an uplink carrier corresponding to this resource; and

(4) option: if the target network device provides a different threshold value (other than the threshold used by the network side to perform the determination, for example, the handover request response message and the handover message include a different threshold value), the threshold value may include one or more threshold values.

[0174] In this case, if a single threshold value is specified in the protocol, or a system message or a handover message includes a threshold value, when the measurement result, RSRP or RSRQ, of the downlink signal of the target cell is greater than or equal to the threshold value, then random access is initiated using the random access resource corresponding to the first uplink carrier; or when the measurement result, RSRP or RSRQ, of the target cell's downlink signal is less than a threshold, then random access is initiated using any random access resource on the remaining uplink carriers.

[0175] If a plurality of thresholds is specified in the protocol, or a system message or a handover message includes a plurality of thresholds, the network device may indicate the correspondence between the two thresholds and the uplink carrier selection (which may alternatively be indicated in protocol, or may be indicated in a system message or a handover message). For example, all uplink carriers supported by the network device include common UL1, SUL1, and SUL2, and the set of thresholds are threshold 1 and threshold 2. When RSRP or RSRQ is less than threshold 1, the terminal device selects SUL1 for performing random access. When RSRP or RSRQ is greater than threshold 1 and less than threshold 2, the terminal device selects SUL2 to perform random access. When RSRP or RSRQ exceeds a threshold value of 2, the terminal device selects a common UL1 to perform random access.

[0176] In another example, for case (4) of the above six cases, since the target network device supports more than two uplink carriers, and the target network device configures a dedicated random access resource for one or more uplink carriers, the terminal device performs a random access preferably using a dedicated random access resource. If there are multiple dedicated random access resources corresponding to multiple uplink carriers, the terminal device may use any of the following three methods:

(1) performing selection based on the sequence configured by the target network device.

(2) performing an arbitrary choice.

(3) it is preferable to use a dedicated random access resource that arrives first and select an uplink carrier corresponding to the resource to perform random access.

[0177] In this case, if random access performed using the dedicated random access resource fails, then random access continues to be performed on the carrier using the shared random access resource.

[0178] In this case, the terminal device may perform random access based on the second indication information sent by the network device. Specifically, after initiating, on the random access common resource, random access by power ramping for X times (with the transmission power of the random access message 1 gradually increasing), the terminal device performs random access using a different uplink carrier. Alternatively, after failing to initiate random access on the random access share for Y times, the terminal device performs random access using a different uplink carrier.

[0179] In another example, for case (5) of the above six cases, when the terminal device initiates, by using the random access common resource, random access on the uplink carrier on which the PUCCH resource is configured, the terminal device may use any of the following three ways:

(1) performing selection based on the sequence configured by the target network device.

(2) performing an arbitrary choice.

(3) it is preferable to use a PUCCH resource that arrives first and select an uplink carrier corresponding to the resource to perform random access.

[0180] In another example, for case (6) of the above six cases, if the target network device supports more than two uplink carriers, and the target network device configures not dedicated random access resources, but a PUCCH resource for one or some of the uplink carriers communication line, the terminal device can use any of the following three methods:

(1) random choice of uplink carrier.

(2) performing selection based on the sequence of uplink carriers configured by the target network device.

(3) performing a determination based on a threshold preconfigured by the target network to determine an uplink carrier on which random access should be performed.

[0181] Therefore, in this embodiment of the present application, when the target cell to which the terminal apparatus is to be handed over includes the first uplink carrier and at least one second uplink carrier, and the first uplink carrier and at least one second uplink carrier corresponds to one downlink carrier in the target cell, the target network device can determine the resource configuration information of the at least one uplink carrier based on the measurement result and the threshold value sent by the terminal device, and send resource configuration information to the terminal device, so that the terminal device can determine, based on the resource configuration information of the at least one uplink carrier, one of the at least one uplink carrier as a target carrier for performing random access.

[0182] FIG. 4 is a schematic block diagram of an interaction of another communication method according to one embodiment of the present application. It should be understood that Fig. 4 shows the steps or operations of a communication method. However, these steps or operations are only examples. Other operations or variants of operations in Fig. 4 may alternatively be performed in this embodiment of the present application. In addition, the steps in Fig. 4 may be performed in a different order from that shown in Fig. 4, and it may not be necessary to perform all of the operations in Fig. 4.

[0183] 410. The target network device (eg, target gNB) sends the threshold to the source network device (eg, source gNB), with the threshold used to select the uplink carrier. In particular, for the threshold value in this document, see the previous description of the threshold value. To avoid repetition, the details are not described again.

[0184] 420. The terminal device sends a measurement report to the source network device. In particular, for the measurement report, refer to the foregoing description. To avoid repetition, the details are not described again.

[0185] Here, the logical flow of step 410 and the logical flow of step 420 are interchangeable. In particular, the target network device may send the threshold value to the source network device before or after the terminal device sends the measurement report to the source network device.

[0186] 430. The source network device determines the target carrier from the at least one uplink carrier based on a threshold value and a measurement reported by the terminal device.

[0187] At least one uplink carrier herein belongs to a target cell (ie, a cell to which a terminal device is to be handed over) of a target network device. Specifically, the at least one uplink carrier includes a first uplink carrier and at least one second uplink carrier, and the target carrier is the first uplink carrier or the second uplink carrier. In particular, for at least one second uplink carrier and target carrier, refer to the preceding description. To avoid repetition, the details are not described again.

[0188] 440. The source network device sends a handover request to the target network device, where the handover request includes information about the target carrier determined in step 430, namely, the handover request may include information used to indicate whether that the target network device performs resource configuration for the first uplink carrier or the second uplink carrier.

[0189] 450. The target network device performs resource configuration for the first uplink carrier or the second uplink carrier based on information included in the handover request message that is used to indicate that the target network device performs resource configuration for the first the uplink carrier or the second uplink carrier, and sends a handover request response to the source network device, where the handover request response includes resource configuration information of the specific target carrier.

[0190] In particular, for the response to the handover request, refer to the previous description of the response to the handover request. To avoid repetition, the details are not described again.

[0191] 460. The source network device sends a handover message to the terminal device.

[0192] In particular, for the handover message, refer to the description of the handover request response at step 450. To avoid repetition, details are not described again.

[0193] In addition, after receiving the handover message sent by the source network device, the operation of the terminal device may vary depending on the specific case of the resource configuration information in the handover message. In particular, for the specific operation of the terminal device, refer to the foregoing description. To avoid repetition, the details are not described again.

[0194] Therefore, in this embodiment of the present application, when the target cell to which the terminal apparatus is to be handed over includes the first uplink carrier and at least one second uplink carrier, and the first uplink carrier and at least one second uplink carrier corresponds to one downlink carrier in the target cell, the source network device can determine, based on the measurement result sent by the terminal device and the threshold value sent by the target network device, at least one uplink carrier for which the resource configuration is to be performed by the target network device, and cause the target network device to perform resource configuration for the determined at least one uplink carrier. Then, the target network device performs resource configuration for the determined at least one uplink carrier based on the indication information included in the handover request message, adds the resource configuration information of the determined at least one uplink carrier to the handover response message, and sends a handover request response message to the source network device. The source network device sends the resource configuration information to the terminal device so that the terminal device determines, based on the resource configuration information of at least one uplink carrier, one uplink carrier of the at least one uplink carrier as the target carrier. to perform random access.

[0195] In this embodiment of the present application, the handover message may include information elements related to the Bandwidth Part (BWP) and information elements related to the carrier SUL.

[0196] In particular, for downlink transmission, the handover message may include downlink (DL) configuration information, and the DL configuration information includes general DL configuration information and downlink BWP configuration information. . The downlink BWP configuration information includes at least one type of the following information: frequency, bandwidth, and frequency offset. In addition, the downlink BWP configuration information may further include a physical information configuration, for example, at least one of a PDCCH configuration and a PDSCH configuration.

[0197] For uplink transmission, the handover message may include uplink UL configuration information. Specifically, an example in which the uplink carrier includes one common UL carrier and one SUL carrier is used for description.

[0198] In an exemplary implementation, the system message and the dedicated RRC message may include a common UL carrier index value and a SUL carrier index value, or a common UL carrier index value and a SUL carrier index value that is explicitly specified in the protocol. For example, the common UL carrier corresponds to index 0 and the SUL carrier corresponds to index 1. In this case, the handover message may include a dedicated random access channel (RACH) configuration. The dedicated RACH configuration may be used to indicate the relationship between the dedicated random access resource and the uplink carrier. For example, the RACH custom configuration information element includes a carrier index. For example, the dedicated random access resource corresponds to a common UL carrier, and the dedicated RACH configuration includes index 0 of the carrier index value.

[0199] In addition, in this embodiment of the present application, the SUL carrier and the common UL carrier may support one or more BWPs (in particular, a dedicated RRC message or a system message may be used to configure the BWP index value).

[0200] In an example where a common UL carrier supports one or more BWPs, it is necessary to specify the BWP of the carrier that corresponds to the dedicated random access resource corresponding to the common UL carrier. For example, the dedicated random access resource corresponds to BWP1 for the NR UL of the carrier, and in addition to index 0 of the carrier index value, the dedicated RACH configuration should additionally include the BWP1 index value of the BWP. Thus, after receiving the handover message, the terminal device can perform random access using the dedicated random access resource in the frequency band BWP1 corresponding to the common UL carrier.

[0201] It can be understood that the foregoing provides a description using the common UL carrier as an example, and the configuration method in this embodiment of the present application may also be applicable to the SUL carrier.

[0202] Further, optionally, in addition to the RACH dedicated configuration, the handover message may further include common UL carrier common configuration information and SUL carrier common configuration information, and common UL carrier dedicated configuration information and dedicated configuration information SUL carrier. Specifically, the general configuration information may include at least one of a PUSCH configuration, a PUCCH configuration, an SRS configuration, an uplink power control configuration, and the like. The dedicated configuration information may include at least one of a PUSCH configuration, a PUCCH configuration, an SRS configuration, an uplink power control configuration, and the like.

[0203] In another exemplary implementation, the handover message may include uplink (UL) configuration information, where the UL configuration information includes general UL common carrier configuration information and SUL common carrier configuration information and dedicated common UL carrier configuration information and SUL dedicated carrier configuration information.

[0204] Each of the SUL carrier and the common UL carrier in this document may support one or more BWPs. In this case, the custom configuration information may further include a BWP configuration. In particular, the BWP index value may be configured using a dedicated RRC message or a system message. Optionally, the uplink BWP configuration may include at least one of frequency, bandwidth, frequency offset, PUSCH configuration, PUCCH configuration, SRS configuration, and uplink power control configuration.

[0205] In one example, the common UL carrier supports BWP1 and BWP2, and the SUL carrier supports BWP1' and BWP2'. In this case, optionally, a custom RACH configuration may be included in the BWP configuration. For example, a dedicated RACH configuration may be included in the carrier's BWP1 NR UL configuration; the terminal device performs random access using a dedicated random access resource in the frequency band of the BWP1 corresponding to the common UL carrier. Optionally, if the generic UL carrier does not support BWP, the RACH dedicated configuration may be included in the generic UL dedicated configuration information. For example, the RACH dedicated configuration may be included in the generic UL carrier dedicated configuration; the terminal device performs random access using a dedicated random access resource corresponding to a common UL carrier.

[0206] It should be understood that the above uses the NR UL carrier as an example, and the above configuration method is also applicable to the SUL carrier.

[0207] Optionally, in this embodiment of the present application, the uplink configuration information may further include a Semi-Persistent Scheduling (SPS) configuration and/or a Grant Free (GF) configuration. In particular, if GF/SPS resources are respectively configured for the same terminal device on a common UL carrier and SUL carrier, it is necessary to ensure that the GF/SPS resources configured on a common UL carrier and SUL carrier are time-shifted. If the GF/SPS resource is configured on only one UL carrier and the GF/SPS resource is not configured on another UL carrier, for example, the GF/SPS resource is configured on the SUL carrier but not on the common UL carrier, the time slot corresponding to the GF/SPS resource configured on the SUL carrier must be bypassed when the terminal device is scheduled on a common UL carrier.

[0208] Similarly, when a secondary station is added in dual connectivity (DC) scenarios, here the secondary station supports a carrier SUL configuration. For example, if the SUL carrier is configured for the primary secondary cell (PSCell) (or secondary cell (SCell)) of the secondary station, the terminal device may be configured using an RRC reconfiguration message. Likewise, the specific RRC reconfiguration message configuration method is the same as the above handover message configuration method.

[0209] With reference to FIGS. 2-4, the above describes in detail how to select an uplink carrier in a handover scenario to perform random access. It should be noted that the method in this embodiment of the present application is also applicable to the dual connectivity scenario. In particular, the source network device in the handover scenario may correspond to the main base station in the dual connectivity scenario, and the target network device in the handover scenario may correspond to the secondary base station in the dual connectivity scenario. It should be understood that the two respective devices herein may perform the same operation or similar operations. In addition, both the handover message in the handover scenario and the RRC connection reconfiguration message in the dual connectivity scenario may include the above types of indication information.

[0210] With reference to FIG. 5 and FIG. 6, a method for configuring an uplink carrier of a secondary station when a secondary station is added in a Dual Connectivity (DC) scenario is described in detail below.

[0211] FIG. 5 is a flowchart of a method for adding a secondary station according to one embodiment of the present application. It should be understood that Fig. 5 shows steps or operations for adding a secondary station. However, these steps or operations are only examples. Other operations or variants of operations in Figure 5 may alternatively be performed in this embodiment of the present application. In addition, the steps in Fig. 5 may be performed in a different order from that shown in Fig. 5, and not all operations in Fig. 5 may need to be performed.

[0212] 510. The terminal device sends a measurement report to the master node (Master Node, MN).

[0213] The MN may be an MgNB master base station in the NR standard or a MeNB master base station in the LTE standard.

[0214] Specifically, the measurement report includes a measurement result of the serving cell and/or neighbor cell from the terminal device. In particular, for the measurement result, refer to the foregoing description of the measurement result. To avoid repetition, the details are not described again.

[0215] 520. The MN sends a request message to add a secondary station to a Secondary Node (SN).

[0216] The SN may be a secondary SgNB in the NR standard.

[0217] Specifically, after receiving the measurement report sent by the terminal device, the MN sends a secondary station add request message to the SN, where the secondary station add request message includes the measurement result reported by the terminal device in step 510 and the result the measurement includes a cell level RSRP and/or cell RSRQ from the SN, or includes a signal measurement result, RSRP and/or RSRQ, of the cell.

[0218] 530. The SN determines the Secondary Cell Group (SCG) configuration based on the measurement result and the threshold value that is used to select the uplink carrier.

[0219] Specifically, if the measurement result is below a threshold value, the SCG may be configured based on either of the following two methods.

[0220] (1) The SN configures the radio resource for the SUL carrier only.

[0221] For example, the SN configures the dedicated RACH configuration for the SUL carrier only. The dedicated RACH configuration includes a preamble index and a frequency/time resource, and may further include at least one of a PUCCH configuration, a PUSCH configuration, and an uplink power control configuration.

[0222] (2) The SN accordingly configures the radio resources for the SUL carrier and the common UL carrier.

[0223] If the measurement result is above the threshold value, the SCG may be configured in any of the following two ways.

[0224] (1) The SN configures the radio resource for the common UL carrier only. The dedicated RACH configuration includes a preamble index and a frequency/time resource, and may further include at least one of a PUCCH configuration, a PUSCH configuration, and an uplink power control configuration.

[0225] (2) The SN accordingly configures the radio resources for the SUL carrier and the common UL carrier.

[0226] 540. The SN sends a response to the request to add a secondary station to the MN, wherein the response to the request includes the associated configuration of the corresponding uplink carrier.

[0227] 550. The MN sends an RRC Connection Reconfiguration message to the terminal device, the response to the request including the associated configuration of the corresponding uplink carrier.

[0228] Specifically, for the configuration method (1) in which the measurement result is below a threshold, the radio resource configuration corresponding to the SUL of the carrier is added to the secondary station addition request confirmation message. After receiving the Secondary Station Add Request Confirmation message, the MN adds the radio resource configuration corresponding to the SUL of the carrier to the first RRC Connection Reconfiguration message. After receiving the first reconfiguration message, the terminal device establishes an RRC connection with the SN using the radio resource configuration corresponding to the SUL carrier (e.g., performing random access to the primary secondary cell (PSCell) of the secondary station using the dedicated RACH configuration corresponding to the SUL carrier, and transmitting data or receiving data from a secondary station using a configuration such as PUCCH/PUSCH SUL carrier configuration); and sets DC mode with MN and SN.

[0229] If the network side changes the configuration policy, the MN/SN sends a second reconfiguration message to the terminal device (e.g., the second reconfiguration message includes an updated radio resource configuration corresponding to the SUL of the carrier (e.g., when there is more than one SUL carrier, then the SUL is changed ; or, when there is only one SUL carrier, a new radio resource configuration is configured for the SUL carrier) or includes a radio resource configuration corresponding to the common UL carrier (e.g., when the downlink measurement result becomes better (above a threshold), the network side decides allow the terminal device to communicate with the SN using the radio resource configuration corresponding to the UL carrier)). After receiving the second reconfiguration message, the terminal device communicates with the SN using the new configuration.

[0230] For the configuration method (2) in which the measurement result is below the threshold, the SN adds the radio resource configurations corresponding to the common UL carrier and the corresponding SUL carrier to the secondary station addition request confirmation message, and the SN instructs the terminal device to establish an RRC connection with the SN using the radio resource configuration corresponding to the SUL of the carrier. After receiving the Secondary Station Add Request Confirmation message, the MN adds the radio resource configurations corresponding to the common UL carrier and the SUL carrier to the first RRC connection reconfiguration message. In addition, optionally, the first RRC connection reconfiguration message may include instruction information used to direct the terminal apparatus to establish a connection with the SN using the radio resource configuration corresponding to the SUL of the carrier.

[0231] Optionally, the secondary station add request acknowledgment/RRC connection reconfiguration message includes a threshold value used to select an uplink carrier. After receiving the RRC connection reconfiguration message, if it is detected that the downlink measurement, RSRP of the cell (PSCell and/or SCell) of the secondary station is above the threshold value, the terminal device may change the association with the SN using the radio resource configuration corresponding to the common UL carrier. Alternatively, the MN/SN sends a second reconfiguration message (e.g., the second reconfiguration message carries an updated radio resource configuration corresponding to the SUL of the carrier (e.g., when there is more than one SUL carrier, then the SUL is changed; or when there is only one SUL carrier, the new radio resource configuration is configured for SUL carrier) and/or the radio resource configuration of the common UL carrier, and carries instruction information used to direct the terminal device to establish a connection with the SN using the radio resource configuration corresponding to the SUL carrier/common UL carrier), and after receiving the reconfiguration message, the terminal device communicates with SN using the new configuration.

[0232] In this case, if the measurement result of the downlink, RSRP, cell (PSCell and/or SCell) of the secondary station is still lower than the threshold value in the first reconfiguration message, or the terminal device does not receive the second reconfiguration message, the terminal device performs communicating with the SN using the radio resource configuration corresponding to the SUL of the carrier and included in the first RRC Connection Reconfiguration message.

[0233] For the configuration method (1) in which the measurement result is above a threshold, the radio resource configuration corresponding to the common UL carrier is added to the secondary station addition request confirmation message. After receiving the Secondary Station Add Request Confirmation message, the MN adds the radio resource configuration corresponding to the common UL carrier to the first RRC Connection Reconfiguration message. After receiving the first reconfiguration message, the terminal device establishes an RRC connection with the SN using the radio resource configuration corresponding to the common UL carrier (for example, performing random access to the primary secondary cell (PSCell) of the secondary station using the dedicated RACH configuration of the common UL carrier and transmitting data or receiving data from a secondary station using a configuration such as a PUCCH/PUSCH common UL carrier configuration); and sets DC mode with MN and SN.

[0234] If the network side changes the configuration policy, the MN/SN sends a second reconfiguration message to the terminal device (e.g., the second reconfiguration message includes an updated radio resource configuration corresponding to a common UL carrier (e.g., a new radio resource configuration configured for a common UL carrier) or includes the radio resource configuration corresponding to the SUL carrier (when the common UL carrier is congested or the downlink measurement result becomes worse (below the threshold value), the network side decides to allow the terminal device to communicate with the SN using the radio resource configuration corresponding to the SUL carrier. If there is more than one SUL, a plurality of SULs are configured.The radio resource configuration is configured for each SUL carrier, and the network device (MN/SN) sets the radio resource configuration for use by the terminal device of a specific SUL carrier, or the terminal the device selects the configuration of radio resources on its own)). After receiving the second reconfiguration message, the terminal device communicates with the SN using the appropriate configuration.

[0235] For the configuration method (2) in which the measurement result is above a threshold, the SN adds the radio resource configurations corresponding to the common UL carrier and the SUL carrier to the secondary station addition request confirmation message, and the SN instructs the terminal device to establish an RRC connection with the SN using the specific carrier radio resource configuration (SUL carrier or common UL carrier). After receiving the Secondary Station Add Request Confirmation message, the MN adds the dedicated radio resource configurations corresponding to the common UL carrier and the SUL carrier to the first RRC connection reconfiguration message. Optionally, the first RRC connection reconfiguration message may include instruction information used to direct the terminal apparatus to establish a connection with the SN using a radio resource configuration corresponding to a specific carrier.

[0236] Optionally, the Secondary Station Add Request Confirmation/First RRC Connection Reconfiguration message includes a threshold value used to select an uplink carrier. After receiving the first RRC connection reconfiguration message, the terminal device performs additional determination based on the threshold value and the measurement result of the downlink obtained by measuring the cell (PSCell and/or SCell) of the secondary station. If the downlink measurement result is below the threshold value, the terminal device communicates with the SN using the radio resource configuration corresponding to the SUL of the carrier. Alternatively, the MN/SN sends a second reconfiguration message to the terminal device (e.g., the reconfiguration message includes an updated radio resource configuration corresponding to the SUL carrier (e.g., when there is more than one SUL carrier, then the SUL changes; or when there is only one SUL carrier , a new radio resource configuration is configured for the SUL carrier) and/or an updated radio resource configuration of the common UL carrier, and includes instruction information used to cause the terminal device to establish a connection with the SN using the radio resource configuration corresponding to the specific carrier). After receiving the reconfiguration message, the terminal device communicates with the SN based on the indication using the new configuration.

[0237] Therefore, in this embodiment of the present application, in the DC scenario, when the secondary station supports the SUL carrier (for example, when the SUL carrier is configured for the primary secondary cell (PSCell) or SCell of the secondary station), the secondary base station can perform resource configuration on based on the measurement result of the cell of the secondary base station from the terminal device and the threshold value. The resource configuration includes resource configuration information of at least one uplink carrier, and at least one uplink carrier herein includes a common UL carrier or SUL carrier. After receiving the resource configuration information of at least one uplink carrier, the terminal device can determine, from at least one uplink carrier, one target carrier for access to realize dual connections with MN and SN.

[0238] FIG. 6 is a flowchart of a method for adding a secondary station according to one embodiment of the present application. It should be understood that Fig. 6 shows steps or operations for adding a secondary station. However, these steps or operations are only examples. Other operations or variants of the operations in Figure 6 may alternatively be performed in this embodiment of the present application. In addition, the steps in Fig. 6 may be performed in a different order from that shown in Fig. 6, and not all operations in Fig. 6 may need to be performed. In this embodiment of the present application, the MN and SN may be devices having functions the same as or similar to those shown in FIG.

[0239] 610. The SN sends the threshold to the MN.

[0240] Specifically, the SN may send the MN in advance via the X2/Xn interface a threshold used to select an uplink carrier. In particular, for the threshold value in this document, see the previous description of the threshold value. To avoid repetition, the details are not described again.

[0241] 620. The terminal device sends a measurement report to the MN. In particular, for the measurement report, refer to the foregoing description. To avoid repetition, the details are not described again.

[0242] Here, the logical flow of step 610 and the logical flow of step 620 are interchangeable. Specifically, the SN may send the threshold value to the MN before or after the terminal apparatus sends the measurement report to the MN.

[0243] 630. The MN determines the SN configuration based on the threshold value and the measurement result.

[0244] After receiving the measurement report sent by the terminal device and the threshold sent from the SN, the MN determines the configuration of the SN based on the threshold and the measurement result. Herein, the measurement result includes a cell level RSRP and/or cell level RSRQ, or includes a beam level measurement, RSRP and/or RSRQ, of a cell.

[0245] Specifically, if the measurement result is below a threshold, the MN may cause the SN to configure the radio resource for the SUL carrier only.

[0246] If the measurement result is above a threshold, the MN may instruct the SN to configure the radio resource for the common UL carrier only. Alternatively, the MN may direct the SN to configure the radio resource configuration for both the SUL carrier and the common UL carrier.

[0247] 640. The MN sends a request to add a secondary station to the SN.

[0248] When the MN indicates that the SN configures the radio resource for the SUL carrier only, the MN adds indication information to the secondary station addition request message, the indication information is used to indicate that the SN configures the radio resource for the SUL carrier only.

[0249] When the MN indicates that the SN configures the radio resource for the common UL carrier only, the MN adds indication information to the secondary station addition request, where the indication information is used to indicate that the SN configures the radio resource for the common UL carrier only.

[0250] When the MN indicates that the SN configures the radio resource for both the SUL carrier and the common UL carrier, the MN adds indication information to the secondary station addition request, where the indication information is used to indicate that the SN configures the radio resource for both the SUL carrier , and a common UL carrier.

[0251] 650. The SN sends a response to the request to add a secondary station to the MN.

[0252] When the secondary station add request message includes indication information used to indicate that the SN configures the radio resource configuration for the SUL carrier only, the SN configures the radio resource configuration for the SUL carrier only. For example, the radio resource configuration includes a dedicated RACH configuration, where the dedicated RACH configuration includes a preamble index and a time frequency resource, and may further include at least one of a PUCCH configuration, a PUSCH configuration, and an uplink power control configuration. Accordingly, the SN adds the radio resource configuration corresponding to the SUL of the carrier to the Secondary Station Add Request Acknowledgment message.

[0253] When the secondary station add request message includes indication information used to indicate that the SN configures the radio resource configuration for the common UL carrier only, the SN configures the radio resource configuration for the common UL carrier only. For example, the radio resource configuration includes a dedicated RACH configuration, where the dedicated RACH configuration includes a preamble index and a time frequency resource, and may further include at least one of a PUCCH configuration, a PUSCH configuration, and an uplink power control configuration. Accordingly, the SN adds the radio resource configuration of the common UL carrier to the Secondary Station Add Request Confirmation message.

[0254] When the secondary station add request message includes indication information used to indicate that the SN configures the radio resource configuration for both the SUL carrier and the common UL carrier, the SN adds the radio resource configurations corresponding to the common UL carrier and the SUL carrier , in the confirmation message of the request to add a secondary station. For example, the radio resource configuration includes a dedicated RACH configuration, where the dedicated RACH configuration includes a preamble index and a time frequency resource, and may further include at least one of a PUCCH configuration, a PUSCH configuration, and an uplink power control configuration. In addition, the SN indicates a carrier (SUL carrier or common UL carrier) corresponding to the radio resource configuration used by the terminal device to establish an RRC connection with the SN.

[0255] 660. The MN sends an RRC connection reconfiguration message to the terminal device.

[0256] When the Secondary Station Add Request Confirmation message indicates that the SN configures the radio resource configuration for the SUL carrier only, the MN adds the radio resource configuration corresponding to the SUL carrier to the first RRC Connection Reconfiguration message. After receiving the first reconfiguration message, the terminal device establishes an RRC connection with the SN using the radio resource configuration corresponding to the SUL carrier, for example, performing random access to the primary secondary cell (PSCell) of the secondary station by using the dedicated RACH SUL configuration of the carrier and transmitting data to the secondary station or receiving data from a secondary station using a configuration such as a PUCCH/PUSCH SUL carrier configuration; and sets DC mode with MN and SN.

[0257] If the network side changes the configuration policy, the MN or SN sends a second reconfiguration message to the terminal device. For example, the second reconfiguration message includes an updated radio resource configuration corresponding to the SUL of the carrier. For example, when there is more than one SUL carrier, then the SUL carrier is changed, or when there is only one SUL carrier, a new radio resource configuration is configured for the SUL carrier. Alternatively, the second reconfiguration message includes a radio resource configuration corresponding to the common UL carrier (when the downlink measurement result becomes better (above a threshold value), the network side decides to allow the terminal device to communicate with the SN using the radio resource configuration corresponding to the common UL carrier)). After receiving the second reconfiguration message, the terminal device communicates with the SN using the new configuration.

[0258] When the secondary station add request confirmation message indicates that the SN configures the radio resource configuration for the common UL carrier only, the radio resource configuration of the common UL carrier is added to the first RRC connection reconfiguration message. After receiving the first reconfiguration message, the terminal device establishes an RRC connection with the SN using the radio resource configuration corresponding to the common UL carrier, for example, performing random access to the primary secondary cell (PSCell) of the secondary station by using the dedicated RACH configuration of the common UL carrier and transmitting data or receiving data. from the secondary station using a configuration such as the PUCCH/PUSCH configuration of a common UL carrier; and sets DC mode with MN and SN.

[0259] If the network side changes the configuration policy, the MN/SN sends a second reconfiguration message to the terminal device. For example, the second reconfiguration message includes an updated radio resource configuration corresponding to a common UL carrier, eg, a new radio resource configuration is configured for a common UL carrier; or includes a radio resource configuration corresponding to the SUL of the carrier. When the common UL carrier is congested or the downlink measurement becomes worse (below a threshold), the network side decides to allow the terminal device to communicate with the SN using the radio resource configuration corresponding to the SUL of the carrier. If there is more than one SUL, a plurality of SULs are configured. The radio resource configuration is configured for each SUL carrier, and the network side determines the radio resource configuration to be used by the terminal device of the particular SUL carrier, or the terminal device selects the radio resource configuration by itself. After receiving the second reconfiguration message, the terminal device communicates with the SN using the appropriate configuration.

[0260] When the secondary station add request confirmation message indicates that the SN is configuring the radio resource configuration for both the SUL carrier and the common UL carrier, the dedicated radio resource configurations corresponding to the common UL carrier and the SUL carrier are added to the first RRC Connection Reconfiguration message and optionally, the first RRC connection reconfiguration message may further include instruction information used to direct the terminal device to establish a connection with the SN using a radio resource configuration corresponding to a specific carrier.

[0261] Optionally, the Secondary Station Add Request Confirmation message or the first RRC Connection Reconfiguration message includes a threshold value used to select a UL carrier. After receiving the first RRC connection reconfiguration message, the terminal device performs further determination based on the threshold value and the measurement result of the downlink obtained by measuring the cell (PSCell and/or SCell) of the secondary station. If the downlink measurement result is below the threshold, the terminal device communicates with the SN using the radio resource configuration corresponding to the SUL of the carrier. Alternatively, the MN/SN sends a second reconfiguration message to the terminal device. For example, the reconfiguration message includes an updated radio resource configuration corresponding to the SUL carrier (e.g., when there is more than one SUL carrier, then the SUL carrier changes; or when there is only one SUL carrier, the new radio resource configuration is configured to SUL the carrier) and/or updated the radio resource configuration of the common UL carrier, and includes instruction information used to direct the terminal device to establish a connection with the SN using the radio resource configuration corresponding to the specific carrier. After receiving the reconfiguration message, the terminal device communicates with the SN based on the indication using the new configuration.

[0262] Therefore, in this embodiment of the present application, in the DC scenario, when the secondary station supports the SUL carrier (for example, the SUL carrier is configured for the primary secondary cell (PSCell) or SCell of the secondary station), the MN may select at least one carrier based on a cell measurement result of the SN from the terminal device and a threshold value sent by the SN, and causes the SN to configure at least one carrier. The SN then determines the resource configuration information of the at least one uplink carrier. Here, at least one uplink carrier defined by SN herein includes a common UL carrier and/or SUL carrier. After receiving certain resource configuration information of at least one uplink carrier, the terminal device can determine from at least one uplink carrier one target carrier for access to realize dual connections with MN and SN.

[0263] FIG. 7 is a block diagram of a terminal device 700 according to one embodiment of the present application. The terminal device 700 includes a receiving unit 710 and a processing unit 720.

[0264] The receiving unit 710 is configured to receive indication information sent by the network device. The indication information is used to indicate resource configuration information of at least one uplink carrier, at least one uplink carrier includes a first uplink carrier and/or at least one second uplink carrier, the first uplink carrier and the at least one second uplink carrier are different uplink carriers in a cell of the network device, and the first uplink carrier and the at least one second uplink carrier correspond to the same downlink carrier in the cell.

[0265] For example, the indication information is used to indicate the resource configuration information of the first uplink carrier or the resource configuration information of the second uplink carrier, the first uplink carrier and the second uplink carrier are different uplink carriers in a cell of the network device, and the first uplink carrier and the second uplink carrier correspond to one downlink carrier in said cell.

[0266] The processing unit 720 is configured to determine, based on the resource configuration information, at least one uplink carrier of one uplink carrier from the at least one uplink carrier as a target carrier for performing random access.

[0267] For example, the processing module 720 is configured to determine the target carrier based on the indication information, and the processing module 720 is further configured to initiate random access using the target carrier.

[0268] Optionally, the indication information is carried in the reconfiguration message used for synchronization, the reconfiguration message used for synchronization includes said first uplink carrier resource configuration information and said second uplink carrier resource configuration information, and when the resource configuration information does not include a dedicated random access resource, the processing unit is specifically configured to:

when determining that the measurement result of the downlink reference signal is greater than or equal to the threshold value, determine the first uplink carrier as the target carrier; or

when determining that the measurement result of the downlink reference signal is less than the threshold value, determine the second uplink carrier as the target carrier.

[0269] Optionally, the uplink first carrier resource configuration information includes at least one of a physical uplink shared channel (PUSCH) configuration, a physical uplink control channel (PUCCH) configuration, a sounding reference signal configuration (SRS), and the uplink power control configuration of the first uplink carrier, and the resource configuration information of the second uplink carrier includes at least one of a PUSCH configuration, a PUCCH configuration, an SRS configuration, and an uplink power control configuration of the second uplink carrier.

[0270] Optionally, the reconfiguration message used for synchronization further includes a threshold value.

[0271] Optionally, the resource configuration information includes a dedicated random access resource, and the processing unit 720 is specifically configured to:

determine, based on the indication information, at least one uplink carrier corresponding to the dedicated random access resource; and

if at least one uplink carrier includes one uplink carrier, determine the uplink carrier as the target carrier; or

if at least one uplink carrier includes at least two uplink carriers, determine one of the at least two uplink carriers as the target carrier.

[0272] Optionally, the indication information includes a carrier index corresponding to the dedicated random access resource. The processing unit 720 is specifically configured to determine the carrier indicated by the carrier index corresponding to the dedicated random access resource as at least one uplink carrier corresponding to the dedicated random access resource.

[0273] Optionally, there is a mapping between the dedicated random access resource and the uplink carrier on which the Physical Uplink Control Channel (PUCCH) resource is configured. The processing unit 720 is specifically configured to determine, based on the correspondence between the dedicated random access resource and the uplink carrier on which the PUCCH resource is configured, at least one uplink carrier corresponding to the dedicated random access resource.

[0274] Optionally, the resource configuration information further includes a PUCCH resource, and the processing unit 720 is specifically configured to:

determine one of the uplink carriers on which the PUCCH resource is configured from among the at least two uplink carriers as the target carrier.

[0275] Optionally, the resource configuration information further includes a shared random access resource, and if the terminal device fails to perform contention-free random access on the target carrier using the dedicated random access resource, the terminal device performs contention-based random access on the target carrier or another uplink carrier different from the target carrier by using a common random access resource.

[0276] Optionally, the resource configuration information includes a PUCCH resource, and the processing module 720 is specifically configured to:

determine one of the uplink carriers on which the PUCCH resource is configured from the at least one uplink carrier as the target carrier.

[0277] Optionally, the processing module 720 is specifically configured to: when there is one uplink carrier on which the PUCCH resource is configured, to determine the uplink carrier on which the PUCCH resource is configured as the target carrier; or

when there are at least two uplink carriers on which the PUCCH resource is configured, determine the target carrier based on the measurement result of the cell.

[0278] Optionally, the resource configuration information includes a random access share, and the processing unit 720 is specifically configured to:

determine the target carrier of the at least one uplink carrier based on the cell measurement result.

[0279] Optionally, the measurement result includes the measurement result of the downlink reference signal, and the processing unit 720 is specifically configured to:

if the measurement result of the downlink reference signal is greater than or equal to the threshold value, determine the first uplink carrier as the target carrier; or

if the measurement result of the downlink reference signal is less than the threshold value, determine the second uplink carrier as the target carrier.

[0280] Optionally, after the terminal device initiates random access on the target carrier by power ramping for X times, or after the terminal device fails to initiate random access on the target carrier for Y times, or the terminal the device sends a random access preamble sequence on the target carrier for Z times the terminal device performs random access on a different uplink carrier than the target carrier, where X, Y and Z are all positive integers greater than 1.

[0281] It should be noted that in this embodiment of the present application, the receiving unit 710 may be implemented by a transceiver, and the processing unit 720 may be implemented by a processor. As shown in FIG. 8, terminal device 800 may include a processor 810, a memory 820, and a transceiver 830. Memory 820 may be configured to store, for example, code executable by processor 810. Processor 810 may be configured to process data or program .

[0282] During implementation, the steps in the above methods may be implemented using hardware integrated logic in the processor 810 or using instructions in the form of software. The method steps disclosed with reference to the embodiments of the present application may be directly executed by a hardware processor or may be performed using a combination of hardware in the processor and a software module. The program module may be located on a storage medium known in the art, such as random access memory, flash memory, read only memory, programmable read only memory, electrically erasable programmable memory, or a register. The storage medium is located in the memory 820, and the processor 810 reads the information in the memory 820 and performs the steps in the above methods in conjunction with the processor 810 hardware. To avoid repetition, details are not described again.

[0283] The terminal device 700 shown in Fig. 7 or the terminal device 800 shown in Fig. 8 may implement the processes corresponding to the above method embodiments. In particular, for terminal device 700 or terminal device 800, see the previous description. To avoid repetition, the details are not described again.

[0284] FIG. 9 is a block diagram of a network device 900 according to one embodiment of the present application. The network device 900 may include a processing unit 910 and a sender 920.

[0285] The processing unit 910 is configured to determine the first indication information. The first indication information is used to indicate resource configuration information of at least one uplink carrier, at least one uplink carrier includes a first uplink carrier and/or at least one second uplink carrier, the first uplink carrier The communication links and the at least one second uplink carrier are different uplink carriers in the cell of the network device 900, and the first uplink carrier and the at least one second uplink carrier correspond to the same downlink carrier in the cell.

[0286] For example, the first indication information is used to indicate the resource configuration information of the first uplink carrier or the resource configuration information of the second uplink carrier, the first uplink carrier and the second uplink carrier are different uplink carriers in the device cell, and the first uplink carrier and the second uplink carrier correspond to one downlink carrier in said cell.

[0287] The sender 920 is configured to send the first indication information so that the terminal device determines one uplink carrier of the at least one uplink carrier as a target carrier for performing random access.

[0288] Optionally, the first indication information is carried in a reconfiguration message used for synchronization, and the reconfiguration message used for synchronization includes said first uplink carrier resource configuration information and said second uplink carrier resource configuration information, or the reconfiguration message used for synchronization includes said first uplink carrier configuration information or said second uplink carrier configuration information.

[0289] Optionally, the uplink first carrier configuration information includes at least one of a physical uplink shared channel (PUSCH) configuration, a physical uplink control channel (PUCCH) configuration, a sounding reference signal configuration ( SRS) and the uplink power control configuration of the first uplink carrier. The uplink second carrier configuration information includes at least one of a physical uplink shared channel (PUSCH) configuration, a physical uplink control channel (PUCCH) configuration, a sounding reference signal (SRS) configuration, and an uplink power control configuration. the communication link of the second uplink carrier.

[0290] Optionally, the reconfiguration message used for synchronization further includes a threshold value, and the threshold value is used by the terminal device to determine the target carrier based on the measurement result of the downlink reference signal.

[0291] Optionally, the first indication information is used to indicate resource configuration information of the target carrier.

[0292] The network device 900 further includes a receiving unit configured to receive a cell measurement result from the terminal device.

[0293] The processing unit 910 is specifically configured to determine the target carrier from the at least one uplink carrier based on the measurement result received by the receiving unit.

[0294] Optionally, the measurement result includes the measurement result of the downlink reference signal, and the processing unit 910 is specifically configured to:

if the measurement result of the downlink reference signal is greater than or equal to a threshold value, determining the first uplink carrier in said at least one uplink carrier as the target carrier; or

if the measurement result of the downlink reference signal is less than the threshold value, determine the second uplink carrier in the at least one uplink carrier as the target carrier.

[0295] Optionally, the resource configuration information includes a dedicated random access resource and/or a PUCCH resource, wherein

the first indication information includes a carrier index corresponding to the dedicated random access resource, and a carrier index corresponding to the dedicated random access resource is used to indicate at least one uplink carrier corresponding to the dedicated random access resource; or

there is a mapping between the dedicated random access resource and an uplink carrier on which a physical uplink control channel (PUCCH) resource is configured, and the mapping is used to indicate at least one uplink carrier corresponding to the dedicated random access resource.

[0296] Optionally, the first indication information includes a random access share.

[0297] Optionally, the sender 920 is further configured to send the second indication information to the terminal device. The second indication information is used to indicate that after the terminal device initiates random access on the target carrier by power ramping for X times, or after the terminal device fails to initiate random access on the target carrier for Y times, or after the terminal device sends the random access preamble sequence on the target carrier for Z times, the terminal device performs random access on another uplink carrier different from the target carrier, where all of X, Y and Z are positive integers, large 1.

[0298] It should be noted that in this embodiment of the present application, the processing unit 910 may be implemented by a processor, and the send unit 920 may be implemented by a transceiver processor. As shown in FIG. 10, the network device 1000 may include a processor 1010, a memory 1020, and a transceiver 1030. The memory 1020 may be adapted to store, for example, code executable by the processor 1010. The processor 1010 may be configured to process data or a program .

[0299] During implementation, the steps in the above methods may be implemented using hardware integrated logic in the processor 1010 or using software instructions. The method steps disclosed with reference to embodiments of the present application may be directly executed by a hardware processor, or may be performed using a combination of hardware in the processor and a software module. The program module may be located on a storage medium well known in the art, such as random access memory, flash memory, read only memory, programmable read only memory, electrically erasable programmable memory, or a register. The storage medium resides in the memory 1020, and the processor 1010 reads the information in the memory 1020 and executes the steps in the above methods in conjunction with the processor 1010 hardware. To avoid repetition, details are not described again.

[0300] The network device 900 shown in FIG. 9 or the network device 1000 shown in FIG. 10 may implement the processes corresponding to the above method embodiments. In particular, for information about the network device 900 or the network device 1000, refer to the above description. To avoid repetition, the details are not described again.

[0301] In one embodiment of the present application, a computer readable medium is further provided, configured to store a computer program. The computer program includes instructions used to execute the method corresponding to the terminal device or network device in the above embodiments of the methods.

[0302] In one embodiment of the present application, a computer program product is further provided. The computer program product includes computer program code. When the computer program code is executed by the communication unit, processing unit, or transceiver, and the processor of the communication device (for example, the aforementioned terminal device or the aforementioned network device), the communication device executes the method corresponding to the terminal device or the network device in the above embodiments of the methods.

[0303] In one embodiment of the present application, a communications chip is further provided. The communication chip stores instructions, and when the instructions are executed in the communication device, the communication chip is enabled to execute the method corresponding to the terminal device or network device in the above embodiments of the methods.

[0304] In one embodiment of the present application, a communication system is further provided. The communication system includes the above terminal device and the above network device. In addition, the communication system in this embodiment of the present application may be in a handover scenario or a dual connectivity scenario. When the communication system is in a handover scenario, the communication system includes a terminal device, a source network device, and a target network device. When the communication system is in the dual connectivity scenario, the communication system includes the aforementioned terminal apparatus, the aforementioned main base station, and the aforementioned secondary base station.

[0305] One skilled in the art may be aware that, in combination with the examples described in the embodiments disclosed in this specification, the blocks and steps of an algorithm may be implemented by electronic hardware or a combination of computer software and electronic hardware. The performance of functions by hardware or software depends on the specific applications and design limitations of the technical solutions. A person skilled in the art can use various methods to implement the described functions for each particular application, but such an implementation should not be considered to be outside the scope of this application.

[0306] One skilled in the art can clearly understand that for the purposes of a convenient and concise description of the detailed working process of the aforementioned system, apparatus, and unit, reference should be made to the corresponding process in the aforementioned method embodiments, and the details will not be repeated.

[0307] In several embodiments provided herein, it should be understood that the disclosed system, apparatus, and method may be implemented differently. For example, the device embodiment described is only an example. For example, the division into blocks is just a logical division of functions, or may be another division in the actual implementation. For example, many blocks or components may be combined or integrated into another system, or some functions may be ignored or may not be performed. In addition, the interconnections or direct communications or communication connections illustrated or described may be implemented using certain interfaces. Indirect connections or communication connections between devices or units may be implemented in electrical, mechanical, or other forms.

[0308] Blocks described as separate components may or may not be physically separate, and components displayed as blocks may or may not be physical blocks, may be located in the same location, or may be distributed across multiple network blocks. Some or all of the blocks may be selected based on actual requirements in order to achieve the objectives of the decisions in the mentioned embodiments.

[0309] In addition, the functional blocks in the embodiments of the present application may be integrated into one processing unit, or each of the units may exist separately physically, or two or more units are integrated into one unit.

[0310] When functions are implemented in the form of a software functional block and sold or used as an independent product, the functions may be stored on a computer-readable storage medium. Based on this understanding, the substance of the technical solutions in this application, or a certain part contributing to the state of the art, or some of the technical solutions may be implemented in the form of a software product. The computer program product is stored on a storage medium and includes several instructions for instructing a computing device (which may be, for example, a personal computer, a server, or a network device) to perform all or some of the steps of the methods described in embodiments of the present application. The aforementioned storage medium includes any medium that can store program code, such as a USB flash drive, removable hard disk, read-only memory (ROM), random access memory (RAM), magnetic disk or optical disk.

[0311] The above descriptions are merely specific implementations of the present application, but are not intended to limit the scope of protection of the present application. Any change or replacement readily detectable by a person skilled in the art within the technical scope disclosed in this application should fall within the scope of this application. Therefore, the scope of protection of this application is subject to the scope of protection defined by the claims.

Claims (63)

1. Method of communication, containing the steps in which: receiving, by the terminal device, indication information from the network device, wherein the indication information indicates resource configuration information of the first uplink carrier and resource configuration information of the second uplink carrier, wherein the first uplink carrier and the second uplink carrier are different uplink carriers communications in a cell of the network device, and the first uplink carrier and the second uplink carrier correspond to one downlink carrier in that cell; determine, by the terminal apparatus, a target carrier based on the indication information, and initiate by the terminal device random access using the target carrier, wherein the resource configuration information of one of the first uplink carrier and the second uplink carrier comprises a dedicated random access resource configured for one of the first uplink carrier and the second uplink carrier, wherein the dedicated random access resource is for contention-free random access , and when said terminal device determines the target carrier based on the indication information, it is determined by the terminal device based on the dedicated random access resource that the uplink carrier, which is one of the first uplink carrier and the second uplink carrier, and is configured with the dedicated random access resource random access is the target carrier. 2. The method of claim 1, wherein when neither the resource configuration information of the first uplink carrier nor the resource configuration information of the second uplink carrier contains a dedicated random access resource, said target carrier determination by the terminal apparatus comprises: in response to the terminal device determining that the measurement result of the downlink reference signal is greater than or equal to the threshold value, determining the first uplink carrier as the target carrier, or in response to the terminal device determining that the measurement result of the downlink reference signal is less than the threshold value, determining the second uplink carrier as the target carrier. 3. The method according to claim 1 or 2, wherein the first uplink carrier resource configuration information comprises at least one of a physical uplink shared channel (PUSCH) configuration, a physical uplink control channel (PUCCH) configuration, a the sounding reference signal (SRS) and the uplink power control configuration of the first uplink carrier and the resource configuration information of the second uplink carrier comprises at least one of a PUSCH configuration, a PUCCH configuration, an SRS configuration, and an uplink power control configuration of the second carrier uplink. 4. The method of claim 2, wherein said threshold is carried in a system message or a handover message from the network device. 5. The method of claim 1, wherein when said terminal device determines, based on the dedicated random access resource, that the uplink carrier configured with the dedicated random access resource is the target carrier, the terminal device determines by the terminal device based on the correspondence between the dedicated random access resource random access and an uplink carrier on which a physical uplink control channel (PUCCH) resource is configured, that the uplink carrier configured with a dedicated random access resource is the target carrier. 6. The method of claim 1, wherein the indication information comprises a carrier index corresponding to the dedicated random access resource, wherein said determination by the terminal device of the target carrier based on the indication information determines by the terminal device an uplink carrier indicated by a carrier index corresponding to the dedicated random access resource. random access resource as the target carrier. 7. The method according to any one of claims 1 to 6, wherein the resource configuration information of the first uplink carrier and the resource configuration information of the second uplink carrier comprise a shared random access resource, the method further comprising: if the terminal device fails to perform contention-free random access on the target carrier using the dedicated random access resource, the terminal device performs contention-based random access on the target carrier or another uplink carrier different from the target carrier by using the shared random access resource. 8. The method of any one of claims 1 to 7, wherein the dedicated random access resource includes a preamble index and a time frequency resource. 9. The method of any one of claims 1 to 7, wherein the second uplink carrier is a supplementary uplink carrier (SUL) for the first uplink carrier in said cell. 10. Method of communication, containing the steps in which: specifying indication information by the network device, wherein the indication information indicates resource configuration information of the first uplink carrier and resource configuration information of the second uplink carrier, wherein the first uplink carrier and the second uplink carrier are different uplink carriers in the cell the network device and the first uplink carrier and the second uplink carrier correspond to one downlink carrier in that cell; and sending, via the network device, indication information to the terminal device, wherein the resource configuration information of one of the first uplink carrier and the second uplink carrier comprises a dedicated random access resource configured for one of the first uplink carrier and the second uplink carrier, wherein the dedicated random access resource is for contention-free random access . 11. The method of claim 10, wherein the indication information is carried in a reconfiguration message used for synchronization, and the reconfiguration message used for synchronization contains resource configuration information of the first uplink carrier and resource configuration information of the second uplink carrier. 12. The method according to claim 10 or 11, wherein the indication information indicates resource configuration information of the target carrier, said determination by the network device of the indication information comprising: receiving, by means of the network device, a measurement result of said cell from the terminal device, and determining, by means of the network device, a target carrier based on the given measurement result. 13. The method of claim 12, wherein said measurement result comprises a measurement result of a downlink reference signal, and said network device determines a target carrier based on the measurement result, comprising: in response to the measurement result of the downlink reference signal being greater than or equal to the threshold value, determining by the network device the first uplink carrier as the target carrier, or in response to the measurement result of the downlink reference signal being less than the threshold value, the network device determines the second uplink carrier as the target carrier by the network device. 14. The method according to any one of claims 10-13, wherein the resource configuration information comprises a dedicated random access resource and/or a Physical Uplink Control Channel (PUCCH) resource, wherein the indication information contains the carrier index corresponding to the dedicated random access resource, and the carrier index corresponding to the dedicated random access resource is used to indicate the target carrier, or there is a mapping between the dedicated random access resource and the uplink carrier on which the PUCCH resource is configured, and this mapping is used to indicate the target carrier. 15. The method of any one of claims 10-14, wherein the dedicated random access resource includes a preamble index and a time-frequency resource. 16. The method of any one of claims 10-14, wherein the second uplink carrier is a supplemental uplink carrier (SUL) for the first uplink carrier in said cell. 17. Communication device, comprising: a receiving unit configured to receive indication information from a network device, wherein the indication information indicates resource configuration information of the first uplink carrier and resource configuration information of the second uplink carrier, wherein the first uplink carrier and the second uplink carrier are different uplink carriers in a cell of the network device, and the first uplink carrier and the second uplink carrier correspond to one downlink carrier in that cell; and a processing unit, configured to determine the target carrier based on the indication information; wherein the processing unit is further configured to initiate random access using the target carrier, wherein the resource configuration information of one of the first uplink carrier and the second uplink carrier comprises a dedicated random access resource configured for one of the first uplink carrier and the second uplink carrier, wherein the dedicated random access resource is for contention-free random access , and wherein the processing unit, being configured to determine the target carrier based on the indication information, is specifically configured to determine, based on the dedicated random access resource, that the uplink carrier that is one of the first uplink carrier and the second uplink carrier link and configured with a dedicated random access resource is the target carrier. 18. The apparatus of claim 17, wherein when neither the resource configuration information of the first uplink carrier nor the resource configuration information of the second uplink carrier contains a dedicated random access resource, the processing unit is specifically configured to: in response to determining that the measurement result of the downlink reference signal is greater than or equal to the threshold value, determine the first uplink carrier as the target carrier, or in response to determining that the measurement result of the downlink reference signal is less than the threshold value, determine the second uplink carrier as the target carrier. 19. The apparatus of claim 17 or 18, wherein the first uplink carrier resource configuration information comprises at least one of a physical uplink shared channel (PUSCH) configuration, a physical uplink control channel (PUCCH) configuration, a the sounding reference signal (SRS) and the uplink power control configuration of the first uplink carrier or the resource configuration information of the second uplink carrier comprises at least one of a PUSCH configuration, a PUCCH configuration, an SRS configuration, and an uplink power control configuration of the second carrier uplink. 20. The apparatus of claim 17, wherein the threshold value is carried in a system message or a handover message from the network device. 21. The apparatus of claim 17, wherein the processing unit is configured to determine, based on the correspondence between the dedicated random access resource and the uplink carrier on which the physical uplink control channel (PUCCH) resource is configured, that the uplink carrier configured with a dedicated random access resource is the target carrier. 22. The apparatus of claim 17, wherein the indication information comprises a carrier index corresponding to the dedicated random access resource, the processing unit being specifically configured to determine the uplink carrier indicated by the carrier index corresponding to the dedicated random access resource as the target carrier. 23. An apparatus according to any one of claims 17 to 22, wherein the resource configuration information of the first uplink carrier and the resource configuration information of the second uplink carrier comprise a shared random access resource, and the processing unit is further configured to: access on the target carrier using the dedicated random access resource to perform contention-based random access on the target carrier or another uplink carrier different from the target carrier using the common random access resource. 24. An apparatus according to any one of claims 17-23, wherein the dedicated random access resource includes a preamble index and a time-frequency resource. 25. An apparatus according to any one of claims 17-23, wherein the second uplink carrier is a supplementary uplink carrier (SUL) for the first uplink carrier in said cell. 26. Communication device, comprising: a processing unit configured to determine indication information, wherein the indication information indicates resource configuration information of the first uplink carrier and resource configuration information of the second uplink carrier, wherein the first uplink carrier and the second uplink carrier are different uplink carriers communication in a device cell, and the first uplink carrier and the second uplink carrier correspond to one downlink carrier in that cell; and a sending unit configured to send indication information to the terminal device, wherein the resource configuration information of one of the first uplink carrier and the second uplink carrier comprises a dedicated random access resource configured for one of the first uplink carrier and the second uplink carrier, wherein the dedicated random access resource is for contention-free random access . 27. The apparatus of claim 26, wherein the indication information is carried in a reconfiguration message used for synchronization, and the reconfiguration message used for synchronization contains resource configuration information of the first uplink carrier and resource configuration information of the second uplink carrier. 28. The apparatus of claim 26 or 27, wherein the indication information indicates resource configuration information of the target carrier, the processing unit being specifically configured to: receive the measurement result of said cell from the terminal device, and determine the target carrier of the at least one uplink carrier based on the measurement result. 29. The apparatus of claim 26, wherein said measurement result comprises a measurement result of the downlink reference signal, and the processing unit is specifically configured to: in response to the measurement result of the downlink reference signal being greater than or equal to a threshold value, determining the first uplink carrier in the at least one uplink carrier as the target carrier; or in response to the measurement result of the downlink reference signal being less than the threshold value, determining the second uplink carrier in the at least one uplink carrier as the target carrier. 30. The device according to any one of claims 26-29, wherein the resource configuration information comprises a dedicated random access resource and/or a Physical Uplink Control Channel (PUCCH) resource; and the indication information contains a carrier index corresponding to the dedicated random access resource, and a carrier index corresponding to the dedicated random access resource is used to indicate at least one uplink carrier corresponding to the dedicated random access resource; or there is a mapping between the dedicated random access resource and the uplink carrier on which the PUCCH resource is configured, and this mapping is used to indicate the target uplink carrier. 31. The apparatus of any one of claims 26-30, wherein the dedicated random access resource includes a preamble index and a time-frequency resource. 32. An apparatus according to any one of claims 26-30, wherein the second uplink carrier is a supplementary uplink carrier (SUL) for the first uplink carrier in said cell. 33. A computer-readable medium containing computer program code, which, when executed by the processor of the device, causes the device to perform the steps of the method according to any one of claims 1-9. 34. A computer-readable medium containing computer program code, which, when executed by the processor of the device, causes the device to perform the steps of the method according to any one of claims 10-16.

Images