Carrier switching, switching control method, device, terminal and network equipment

Abstract

The application provides a carrier switching method and device, a terminal and a network device. The method comprises the following steps: reporting a switching carrier aggregation capability parameter; receiving switching carrier aggregation indication information sent by a network device; performing carrier switching according to the switching carrier aggregation indication information, and performing sending and / or receiving on the switched carrier; and during the carrier switching, the terminal does not perform sending and / or receiving. The above scheme can realize a switching carrier aggregation process and ensure communication reliability.

Description

Technical Field

[0001] This application relates to the field of communication technology, and in particular to a carrier switching, switching control method, apparatus, terminal and network equipment. Background Technology

[0002] To reduce the cost of user equipment (UE) while fully utilizing the low-frequency spectrum owned by operators, a method of handover carrier aggregation has been proposed. For example... Figure 1 The diagram shows a UE architecture with two component carrier (CC) switching carrier aggregation. Its baseband processing includes processing units for two carriers and one radio frequency / antenna processing unit. The UE switches between the following two schemes based on the base station configuration information:

[0003] Option 1: Perform transmission / reception on the first carrier (corresponding to the primary cell), and do not perform reception on the second carrier (corresponding to the secondary cell).

[0004] Option 2: Perform reception on the second carrier and do not perform transmission / reception on the first carrier.

[0005] How to implement the carrier aggregation process is an urgent problem to be solved. Summary of the Invention

[0006] This application provides a carrier switching, switching control method, apparatus, terminal, and network device to realize the switching carrier aggregation process and ensure communication reliability.

[0007] To address the aforementioned technical problems, this application provides a carrier switching method applied to a terminal, comprising:

[0008] Report handover carrier aggregation capability parameters;

[0009] Receive carrier aggregation indication information sent by network devices;

[0010] Carrier switching is performed according to the carrier aggregation indication information, and transmission and / or reception are performed on the switched carrier;

[0011] During carrier switching, the terminal does not transmit and / or receive.

[0012] Optionally, the switching carrier aggregation capability parameters include at least one of the following:

[0013] At least two bands must be used to form a switched carrier aggregation;

[0014] First carrier switching duration;

[0015] A switching state combination, which indicates a carrier state that can be switched.

[0016] Optionally, the switching state combination includes at least one of the following:

[0017] Switching between carrier state one and carrier state two;

[0018] Switching between carrier state one and carrier state three;

[0019] Wherein, carrier state one is used to characterize that the terminal transmits and / or receives only on the first carrier; carrier state two is used to characterize that the terminal receives only on the second carrier; and carrier state three is used to characterize that the terminal receives on the second carrier and transmits on the first carrier.

[0020] Optionally, the switching carrier aggregation capability parameter is used to indicate the correspondence between the band and the first carrier and / or the second carrier;

[0021] Wherein, the first carrier is a carrier that the terminal can receive and transmit, and the second carrier is a carrier that the terminal can receive; or, both the first carrier and the second carrier are carriers that the terminal can receive.

[0022] Optionally, the switching carrier aggregation indication information includes at least one of the following:

[0023] Time-domain information of carrier switching;

[0024] First indication information, the first indication information being used to indicate that time-domain information for carrier switching is applied to the first carrier and / or the second carrier;

[0025] The second carrier switching duration is greater than or equal to the first carrier switching duration reported by the terminal.

[0026] Uplink delay.

[0027] Optionally, the time-domain information of the carrier switching satisfies at least one of the following:

[0028] The time-domain information for carrier switching is configured with a time-domain mode information, which is applied to the first carrier and / or the second carrier.

[0029] The carrier switching time-domain information is configured with two time-domain mode information, wherein one time-domain mode information is applied to the first carrier and the other time-domain mode information is applied to the second carrier.

[0030] Optionally, when two time-domain mode information are configured in the time-domain information of carrier switching, the method further includes:

[0031] If a first symbol exists in both time-domain mode information, the first symbol is determined to be applied to the first carrier or the second carrier for transmission and / or reception based on the priority of the first carrier and the second carrier and / or the priority of the transmitted data.

[0032] The first symbol belongs to one or more overlapping symbols in the two configured time-domain mode information.

[0033] Optionally, the uplink delay includes: maximum uplink delay and minimum uplink delay.

[0034] Optionally, the handover location for carrier switching satisfies at least one of the following:

[0035] The switching position is either switching the source carrier or switching the target carrier;

[0036] Switch the position to the first carrier or the second carrier;

[0037] The location switch is determined based on the priority indicator.

[0038] Optionally, when the first carrier is a carrier that the terminal can both receive and transmit on, the second carrier is a carrier that the terminal can receive on, and the method switches from the first carrier to the second carrier, the method further includes:

[0039] The target symbol is determined as the uplink symbol position where the first carrier stops transmitting;

[0040] The target symbol is at least one of the following: symbol x+P, symbol x;

[0041] Where x is the downlink symbol index for the switch;

[0042] The method for determining P includes one of the following:

[0043]

[0044] P = G;

[0045]

[0046] Where G is the uplink delay or minimum uplink delay; T is the timing advance time; H is the handover duration; and dur_OS is the duration of one OFDM symbol. This is the floor function.

[0047] Optionally, when the first carrier is a carrier that the terminal can both receive and transmit on, the second carrier is a carrier that the terminal can receive on, and the method switches from the first carrier to the second carrier, the method further includes:

[0048] The target symbol is determined as the position of the latest uplink symbol transmitted by the first carrier;

[0049] The target symbol is at least one of the following: symbol y+P1, symbol y;

[0050] Where y is the last symbol that the carrier can receive before the handover;

[0051] The method for determining P1 includes at least one of the following:

[0052]

[0053] P1 = G;

[0054] Where G is the uplink delay or minimum uplink delay; T is the timing advance time; and dur_OS is the duration of an OFDM symbol. This is the floor function.

[0055] Optionally, if an uplink delay is configured, and the uplink delay includes a minimum uplink delay, then the value of T is the value of the minimum uplink delay.

[0056] Optionally, when the first carrier is a carrier that the terminal can both receive and transmit on, the second carrier is a carrier that the terminal can receive on, and the method switches from the second carrier to the first carrier, the method further includes:

[0057] The uplink symbol position at which the first carrier begins transmission is determined based on x+Q;

[0058] Where x is the downlink symbol index for the switch;

[0059] The methods for determining Q include the following:

[0060]

[0061] Where N is determined based on the uplink advance time and / or H, H is the handover duration, dur_OS is the duration of an OFDM symbol, and G is the uplink delay or maximum uplink delay. This is the floor function.

[0062] Optionally, when the first carrier is a carrier that the terminal can both receive and transmit on, the second carrier is a carrier that the terminal can receive on, and the method switches from the second carrier to the first carrier, the method further includes:

[0063] The uplink symbol position at which the first carrier begins transmission is determined based on z+Q1;

[0064] Where z is the index of the earliest downlink symbol received by the carrier after the handover;

[0065] The method for determining Q1 includes at least one of the following:

[0066]

[0067] Q1 = G;

[0068] Where N is determined based on the uplink advance time and / or H, H is the handover duration, dur_OS is the duration of an OFDM symbol, and G is the uplink delay or maximum uplink delay. This is the floor function.

[0069] Optionally, if an uplink delay is configured, and the uplink delay includes a maximum uplink delay, the uplink lead time is taken as the value of the maximum uplink delay.

[0070] This application also provides a carrier switching control method, applied to a network device, including:

[0071] The receiving terminal sends the switching carrier aggregation capability parameters;

[0072] Based on the switching carrier aggregation capability parameters, a switching carrier aggregation indication message is sent to the terminal.

[0073] Optionally, the switching carrier aggregation capability parameters include at least one of the following:

[0074] At least two bands must be used to form a switched carrier aggregation;

[0075] First carrier switching duration;

[0076] A switching state combination, which indicates a carrier state that can be switched.

[0077] Optionally, the switching state combination includes at least one of the following:

[0078] Switching between carrier state one and carrier state two;

[0079] Switching between carrier state one and carrier state three;

[0080] Wherein, carrier state one is used to characterize that the terminal transmits and / or receives only on the first carrier; carrier state two is used to characterize that the terminal receives only on the second carrier; and carrier state three is used to characterize that the terminal receives on the second carrier and transmits on the first carrier.

[0081] Optionally, the switching carrier aggregation capability parameter is used to indicate the correspondence between the band and the first carrier and / or the second carrier;

[0082] Wherein, the first carrier is a carrier that the terminal can receive and transmit, and the second carrier is a carrier that the terminal can receive; or, both the first carrier and the second carrier are carriers that the terminal can receive.

[0083] Optionally, the switching carrier aggregation indication information includes at least one of the following:

[0084] Time-domain information of carrier switching;

[0085] First indication information, the first indication information being used to indicate that time-domain information for carrier switching is applied to the first carrier and / or the second carrier;

[0086] The second carrier switching duration is greater than or equal to the first carrier switching duration reported by the terminal.

[0087] Uplink delay.

[0088] Optionally, the time-domain information of the carrier switching satisfies at least one of the following:

[0089] The time-domain information for carrier switching is configured with a time-domain mode information, which is applied to the first carrier and / or the second carrier.

[0090] The carrier switching time-domain information is configured with two time-domain mode information, wherein one time-domain mode information is applied to the first carrier and the other time-domain mode information is applied to the second carrier.

[0091] Optionally, the uplink delay includes: maximum uplink delay and minimum uplink delay.

[0092] This application also provides a terminal, including a memory, a transceiver, and a processor:

[0093] A memory for storing computer programs; a transceiver for sending and receiving data under the control of the processor; and a processor for reading the computer programs from the memory and performing the following operations:

[0094] Report handover carrier aggregation capability parameters;

[0095] Receive carrier aggregation indication information sent by network devices;

[0096] Carrier switching is performed according to the carrier aggregation indication information, and transmission and / or reception are performed on the switched carrier;

[0097] During carrier switching, the terminal does not transmit and / or receive.

[0098] Optionally, the switching carrier aggregation capability parameters include at least one of the following:

[0099] At least two bands must be used to form a switched carrier aggregation;

[0100] First carrier switching duration;

[0101] A switching state combination, which indicates a carrier state that can be switched.

[0102] Optionally, the switching state combination includes at least one of the following:

[0103] Switching between carrier state one and carrier state two;

[0104] Switching between carrier state one and carrier state three;

[0105] Wherein, carrier state one is used to characterize that the terminal transmits and / or receives only on the first carrier; carrier state two is used to characterize that the terminal receives only on the second carrier; and carrier state three is used to characterize that the terminal receives on the second carrier and transmits on the first carrier.

[0106] Optionally, the switching carrier aggregation capability parameter is used to indicate the correspondence between the band and the first carrier and / or the second carrier;

[0107] Wherein, the first carrier is a carrier that the terminal can receive and transmit, and the second carrier is a carrier that the terminal can receive; or, both the first carrier and the second carrier are carriers that the terminal can receive.

[0108] Optionally, the switching carrier aggregation indication information includes at least one of the following:

[0109] Time-domain information of carrier switching;

[0110] First indication information, the first indication information being used to indicate that time-domain information for carrier switching is applied to the first carrier and / or the second carrier;

[0111] The second carrier switching duration is greater than or equal to the first carrier switching duration reported by the terminal.

[0112] Uplink delay.

[0113] Optionally, the time-domain information of the carrier switching satisfies at least one of the following:

[0114] The time-domain information for carrier switching is configured with a time-domain mode information, which is applied to the first carrier and / or the second carrier.

[0115] The carrier switching time-domain information is configured with two time-domain mode information, wherein one time-domain mode information is applied to the first carrier and the other time-domain mode information is applied to the second carrier.

[0116] Optionally, when two time-domain mode information are configured in the time-domain information of carrier switching, the processor, for reading the computer program in the memory, further performs the following operations:

[0117] If a first symbol exists in both time-domain mode information, the first symbol is determined to be applied to the first carrier or the second carrier for transmission and / or reception based on the priority of the first carrier and the second carrier and / or the priority of the transmitted data.

[0118] The first symbol belongs to one or more overlapping symbols in the two configured time-domain mode information.

[0119] Optionally, the uplink delay includes: maximum uplink delay and minimum uplink delay.

[0120] Optionally, the handover location for carrier switching satisfies at least one of the following:

[0121] The switching position is either switching the source carrier or switching the target carrier;

[0122] Switch the position to the first carrier or the second carrier;

[0123] The location switch is determined based on the priority indicator.

[0124] Optionally, when the first carrier is a carrier that the terminal can both receive and transmit on, the second carrier is a carrier that the terminal can receive on, and the process switches from the first carrier to the second carrier, the processor, for reading the computer program in the memory, further performs the following operations:

[0125] The target symbol is determined as the uplink symbol position where the first carrier stops transmitting;

[0126] The target symbol is at least one of the following: symbol x+P, symbol x;

[0127] Where x is the downlink symbol index for the switch;

[0128] The method for determining P includes one of the following:

[0129]

[0130] P = G;

[0131]

[0132] Where G is the uplink delay or minimum uplink delay; T is the timing advance time; H is the handover duration; and dur_OS is the duration of one OFDM symbol. This is the floor function.

[0133] Optionally, when the first carrier is a carrier that the terminal can both receive and transmit on, the second carrier is a carrier that the terminal can receive on, and the process switches from the first carrier to the second carrier, the processor, for reading the computer program in the memory, further performs the following operations:

[0134] The target symbol is determined as the position of the latest uplink symbol transmitted by the first carrier;

[0135] The target symbol is at least one of the following: symbol y+P1, symbol y;

[0136] Where y is the last symbol that the carrier can receive before the handover;

[0137] The method for determining P1 includes at least one of the following:

[0138]

[0139] P1 = G;

[0140] Where G is the uplink delay or minimum uplink delay; T is the timing advance time; and dur_OS is the duration of an OFDM symbol. This is the floor function.

[0141] Optionally, if an uplink delay is configured, and the uplink delay includes a minimum uplink delay, then the value of T is the value of the minimum uplink delay.

[0142] Optionally, when the first carrier is a carrier that the terminal can both receive and transmit on, the second carrier is a carrier that the terminal can receive on, and the process switches from the second carrier to the first carrier, the processor, for reading the computer program in the memory, further performs the following operations:

[0143] The uplink symbol position at which the first carrier begins transmission is determined based on x+Q;

[0144] Where x is the downlink symbol index for the switch;

[0145] The methods for determining Q include the following:

[0146]

[0147] Where N is determined based on the uplink advance time and / or H, H is the handover duration, dur_OS is the duration of an OFDM symbol, and G is the uplink delay or maximum uplink delay. This is the floor function.

[0148] Optionally, when the first carrier is a carrier that the terminal can both receive and transmit on, the second carrier is a carrier that the terminal can receive on, and the process switches from the second carrier to the first carrier, the processor, for reading the computer program in the memory, further performs the following operations:

[0149] The uplink symbol position at which the first carrier begins transmission is determined based on z+Q1;

[0150] Where z is the index of the earliest downlink symbol received by the carrier after the handover;

[0151] The method for determining Q1 includes at least one of the following:

[0152]

[0153] Q1 = G;

[0154] Where N is determined based on the uplink advance time and / or H, H is the handover duration, dur_OS is the duration of an OFDM symbol, and G is the uplink delay or maximum uplink delay. This is the floor function.

[0155] Optionally, if an uplink delay is configured, and the uplink delay includes a maximum uplink delay, the uplink lead time is taken as the value of the maximum uplink delay.

[0156] This application also provides a network device, including a memory, a transceiver, and a processor:

[0157] A memory for storing computer programs; a transceiver for sending and receiving data under the control of the processor; and a processor for reading the computer programs from the memory and performing the following operations:

[0158] The receiving terminal sends the switching carrier aggregation capability parameters;

[0159] Based on the switching carrier aggregation capability parameters, a switching carrier aggregation indication message is sent to the terminal.

[0160] This application also provides a carrier switching device applied to a terminal, including:

[0161] The reporting unit is used to report handover carrier aggregation capability parameters;

[0162] The first receiving unit is used to receive handover carrier aggregation indication information sent by the network device;

[0163] An execution unit is configured to perform carrier switching according to the carrier aggregation indication information, and to transmit and / or receive on the switched carrier;

[0164] During carrier switching, the terminal does not transmit and / or receive.

[0165] This application also provides a carrier switching control device, applied to a network device, including:

[0166] The second receiving unit is used to receive the switching carrier aggregation capability parameters sent by the terminal;

[0167] The transmitting unit is used to send a switching carrier aggregation indication information to the terminal according to the switching carrier aggregation capability parameters.

[0168] This application also provides a processor-readable storage medium storing a computer program for causing the processor to perform the above-described method.

[0169] This application also provides a computer program product, including computer instructions, which, when executed by a processor, implement the steps of the above-described method.

[0170] The beneficial effects of this application are:

[0171] The above scheme achieves the carrier aggregation process and ensures communication reliability by reporting the carrier aggregation capability parameters, receiving the carrier aggregation indication information sent by the network device, performing carrier switching according to the carrier aggregation indication information, and transmitting and / or receiving on the switched carrier. Attached Figure Description

[0172] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0173] Figure 1 A schematic diagram illustrating the UE structure with aggregation of two CC handover carriers;

[0174] Figure 2 A schematic diagram showing the structure of a receiver with two CCs;

[0175] Figure 3 This diagram illustrates the uplink carrier switching between two carriers.

[0176] Figure 4 A flowchart illustrating a carrier switching method according to an embodiment of this application;

[0177] Figure 5 A comparative diagram showing the configuration of information in different time-domain modes;

[0178] Figure 6 A schematic diagram illustrating the switching from the first carrier to the second carrier;

[0179] Figure 7 A schematic diagram illustrating the switching from the second carrier to the first carrier;

[0180] Figure 8 A schematic diagram illustrating the state where the switching time is shifted backward;

[0181] Figure 9 A flowchart illustrating application scenario one;

[0182] Figure 10 A schematic diagram showing the time-domain mode information of a switching point using the second carrier.

[0183] Figure 11 A schematic diagram showing the time-domain mode information of multiple switching points using the second carrier;

[0184] Figure 12 A schematic diagram illustrating the switching from the first carrier to the second carrier in application scenario one;

[0185] Figure 13 A schematic diagram illustrating the switching from the second carrier to the first carrier in application scenario one;

[0186] Figure 14 A schematic diagram illustrating the time-domain mode information applied to the second carrier in application scenario two;

[0187] Figure 15 A schematic diagram illustrating the time-domain mode information applied to carrier state three in application scenario two;

[0188] Figure 16 A flowchart illustrating the carrier switching control method according to an embodiment of this application;

[0189] Figure 17 A schematic diagram of the carrier switching device according to an embodiment of this application;

[0190] Figure 18 A structural diagram of the terminal according to an embodiment of this application;

[0191] Figure 19 A schematic diagram of the carrier switching control device according to an embodiment of this application;

[0192] Figure 20 This is a structural diagram of a network device according to an embodiment of this application. Detailed Implementation

[0193] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0194] The terms “first,” “second,” etc., used in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the application described herein may be implemented in orders other than those illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0195] In this application's embodiments, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship. In this application's embodiments, the term "multiple" refers to two or more, and other quantifiers are similar.

[0196] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0197] The relevant concepts mentioned in this application will be briefly explained below.

[0198] I. Uplink transmission time adjustment

[0199] The transmission time adjustment here typically refers to appropriately advancing the transmission time / timing when User Equipment (UE) sends uplink signals or channel data. This ensures that the difference between uplink signals sent by different UEs reaching the base station does not exceed one cyclic prefix (CP) length, aiming to reduce or avoid interference between symbols from different UEs. The following uses a single-path signal to illustrate the role of transmission time adjustment.

[0200] For example, UE1 and UE2 are located at different positions within the base station's coverage area. UE1 is d1 meters away from the base station, and UE2 is d2 meters away, where d2 is greater than d1. To reduce or eliminate mutual interference between the signals transmitted by UE1 and UE2, the signals transmitted by both UEs need to arrive at the base station simultaneously (Orthogonal frequency division multiplexing (OFDM) systems require arrival time errors to be controlled within one CP). To ensure that the signals transmitted by UE1 / UE2 arrive at the base station at time T0, then:

[0201] The UE1 signal transmission time is: T0-d1 / c; d1 is the distance between UE1 and the base station, and c is the speed of light.

[0202] The UE2 signal transmission time is: T0-d2 / c; d2 is the distance between UE2 and the base station, and c is the speed of light.

[0203] It should be noted that the above explanation is for the purpose of briefly illustrating that the UE needs to transmit signals in advance. In practice, the UE does not know the actual value of T0. In the specific implementation process:

[0204] The time point at which UE1 transmits the signal is: T0+d1 / c-2*d1 / c. Where (T0+d1 / c) is the downlink reception synchronization time of UE1, which is determined by UE1; 2*d1 / c is the transmission time advance, i.e., the timing advance (TA, also known as the timing advance time or timing advance).

[0205] The time point at which UE2 transmits the signal is: T0 + d2 / c - 2*d2 / c. Where (T0 + d2 / c) is the downlink reception synchronization time of UE2, which is determined by UE2; 2*d2 / c is the transmission time advance, i.e., TA.

[0206] II. Carrier Aggregation (CA)

[0207] Carrier aggregation (CA) is a wireless communication technology primarily used in Long Term Evolution (LTE) and 5G networks. It enhances data transmission capabilities and improves network performance by combining multiple spectrum carriers into a single logical carrier. Carrier aggregation can be implemented in two ways:

[0208] Intra-band carrier aggregation (CA): Aggregating channels within the same frequency band, which can be adjacent or non-adjacent. For example, bundling two 20MHz carriers into a 40MHz bandwidth.

[0209] Inter-band carrier aggregation (CA): Aggregating channels across different frequency bands. For example, combining a 20MHz TDD carrier and a 20MHz Frequency-division Duplex (FDD) carrier into a 40MHz bandwidth.

[0210] Correspondingly, the terminal receiver needs the capability to receive multi-carrier aggregation signals. Taking two-carrier aggregation across two different frequency bands as an example, the receiver structure of the terminal is explained as follows: Figure 2 As shown, in order to support the CA function of two carriers, the terminal needs two receivers, namely two antennas, two RF (radio frequency) processing circuits, two baseband processing circuits, and also two transmitters.

[0211] III. Uplink Carrier Switching

[0212] Considering terminal cost, some components can be shared across different carriers to reduce manufacturing costs, but handover time and location need to be taken into account. Currently, uplink handover between carriers on two different frequency bands is supported. A simplified terminal architecture model and handover process are as follows: Figure 3 As shown, inter-carrier handover may occur during terminal uplink communication, for example:

[0213] When transmitting signals or channel data on carrier 1, the control parameters of the radio frequency (RF) adopt the values ​​related to carrier 1, and the output point A of the RF section is switched to the power amplifier input point 1 of carrier 1. At the same time, the power amplifier output 1 is switched to the antenna B.

[0214] When transmitting signals or channels on carrier 2, the control parameters of the RF adopt the values ​​related to carrier 2, and the output point A of the RF section switches to the power amplifier input point 2 of carrier 2. At the same time, the power amplifier output 2 switches to the antenna B.

[0215] It should be noted that the difference between uplink carrier switching and handover carrier aggregation is:

[0216] The uplink carrier handover process only involves uplink handover, and it can be assumed that the corresponding downlink reception does not undergo handover. In terms of technical solution, the downlink situation is not considered, and the handover time is executed according to the uplink symbol position, without involving TA.

[0217] The carrier aggregation handover process involves both uplink and downlink, meaning it involves both uplink and downlink. In terms of technical solutions, considering both uplink and downlink scenarios, the handover time is executed based on the uplink or downlink symbol position, and the TA (Transmission Time) needs to be taken into account.

[0218] When the UE supports carrier handover aggregation of two CCs, the following two methods need to be addressed:

[0219] 1. How can the base station effectively indicate handover configuration information?

[0220] 2. How the UE performs the carrier handover process. The method described in relevant technical descriptions is that the base station needs to use Radio Resource Control (RRC) to configure a semi-static handover pattern (or time-domain pattern) to achieve the handover between Scheme 1 and Scheme 2. Conventionally, the base station indicates which symbols / slots are in the transmission state of Scheme 1 and which are in the transmission state of Scheme 2 based on the downlink timeslot / symbol numbering.

[0221] Corresponding to uplink carrier switching, the uplink carrier switching behavior is determined according to the scheduling signaling (no pattern configuration), and the switching time is based on the uplink scheduling indication time (uplink timeslot / symbol).

[0222] The current technical solution only discloses that the base station uses RRC to configure a semi-static handover pattern (time-domain pattern) to achieve the handover between Solution 1 and Solution 2. However, the technical solution is too simplistic and has at least the following problems that need to be addressed:

[0223] 1: If the switching time domain pattern information contains indication information indexed by the downlink time slot / symbol, and the downlink and uplink time slot / symbol numbers are not completely aligned due to TA factors, how to determine the uplink switching time slot / symbol.

[0224] 2: The configured time-domain pattern information, how it corresponds to the first carrier transmission time in Scheme 1 (the first carrier corresponds to PCELL, or a cell on band1, or a transmit / receive cell), and how it corresponds to the second carrier transmission time in Scheme 2 (the second carrier corresponds to SCELL, or a cell on band2, or only a receive cell).

[0225] The solution proposed in this application can solve the above problems.

[0226] The embodiments of this application are described below with reference to the accompanying drawings. The carrier switching, switching control method, apparatus, terminal, and network equipment provided in the embodiments of this application can be applied to wireless communication systems. This wireless communication system can be a system employing fifth-generation (5G) mobile communication technology (hereinafter referred to as a 5G system). Those skilled in the art will understand that the 5G NR system is merely an example and not a limitation.

[0227] Optionally, the network system structure applicable to this application embodiment includes a user terminal and a base station. The user terminal can be user equipment (UE), such as a mobile phone, tablet computer, laptop computer, personal digital assistant (PDA), mobile internet device (MID), or wearable device. It should be noted that this application embodiment does not limit the specific type of user terminal. The base station can be a 5G or later version base station (e.g., gNB, 5G NR NB), or a base station in other communication systems, also referred to as a node B. It should be noted that this application embodiment only uses a 5G base station as an example, but does not limit the specific type of base station.

[0228] This application provides a carrier switching, switching control method, apparatus, terminal, and network device to realize the switching carrier aggregation process and ensure communication reliability.

[0229] The method and apparatus are based on the same concept of the application. Since the methods and apparatus solve problems in similar ways, the implementation of the apparatus and methods can refer to each other, and the repeated parts will not be described again.

[0230] like Figure 4 As shown, this application embodiment provides a carrier switching method, executed by a terminal, including:

[0231] Step S401: Report the handover carrier aggregation capability parameters;

[0232] Step S402: Receive carrier aggregation indication information sent by the network device;

[0233] Step S403: Perform carrier switching according to the carrier aggregation indication information, and transmit and / or receive on the switched carrier;

[0234] During carrier switching, the terminal does not transmit and / or receive.

[0235] It should be noted that, in this embodiment of the application, by reporting the switching carrier aggregation capability parameters, receiving the switching carrier aggregation indication information sent by the network device, performing carrier switching according to the switching carrier aggregation indication information, and transmitting and / or receiving on the switched carrier, the switching carrier aggregation process can be realized, thereby ensuring communication reliability.

[0236] It should be noted that the embodiments of this application mainly involve two types of carriers, namely a first carrier and a second carrier. Optionally, in one case, the first carrier is a carrier that the terminal can both receive and transmit, and the second carrier is a carrier that the terminal can receive. Optionally, in this case, the first carrier is usually applied to the primary cell (PCell), that is, on the first carrier, the terminal has a transmit / receive capability unit, which can transmit uplink data and uplink control information (UCI), and also receive downlink data. For example, the first carrier is applied to a frequency-division duplex (FDD) spectrum cell or a time-division duplex (TDD) frequency domain cell. The second carrier is usually applied to the secondary cell (SCell), that is, on the second carrier, the terminal only has a receive capability unit. For example, the second carrier is applied to single downlink (SDL). It should be noted that in this case, the terminal can achieve carrier aggregation during handover.

[0237] In another scenario, both the first and second carriers are carriers that the terminal can receive from. That is, on the first carrier, the terminal only has a receiving capability unit, and on the second carrier, the terminal only has a receiving capability unit. It should be noted that in this case, the terminal can perform downlink carrier handover.

[0238] In other words, the embodiments of this application can realize not only the switching carrier aggregation process, but also the downlink carrier switching process.

[0239] Optionally, in step S401, the terminal can report its capabilities, that is, the terminal can indicate to the network device its ability to switch carrier aggregation.

[0240] Optionally, the switching carrier aggregation capability parameters include at least one of A11-A13:

[0241] A11. At least two bands that constitute switched carrier aggregation;

[0242] Optionally, in the embodiments of this application, a band index may be used to indicate the band.

[0243] Optionally, the terminal can report two bands, i.e., switch between two bands; alternatively, the terminal can also report three bands, i.e., switch between any two of the three bands; the cases for four or more bands are similar to those for two or three bands, and will not be elaborated here.

[0244] A12, First carrier switching duration;

[0245] Optionally, the first carrier switching duration is used to configure the switching duration when the carriers of the two bands switch. The unit of the duration can be symbols, milliseconds, microseconds, etc.; the switching duration can be one value or multiple values, such as {35 microseconds, 70 microseconds, 140 microseconds}.

[0246] A13. Switching state combination, wherein the switching state combination is used to indicate a carrier state that can be switched;

[0247] Optionally, the switching state combination includes at least one of A131-A132:

[0248] A131, Switching between carrier state one and carrier state two;

[0249] Optionally, carrier state one is used to characterize that the terminal only transmits and / or receives on the first carrier. That is, under carrier state one, the terminal transmits and / or receives on the first carrier and does not receive on the second carrier (the second carrier can only receive); carrier state two is used to characterize that the terminal only receives on the second carrier. That is, the terminal does not transmit or receive on the first carrier, but receives on the second carrier.

[0250] A132, Switching between carrier state one and carrier state three;

[0251] Optionally, the carrier state three is used to characterize that the terminal receives on the second carrier and transmits on the first carrier.

[0252] Optionally, the switching carrier aggregation capability parameter is used to indicate the correspondence between the band and the first carrier and / or the second carrier. Optionally, this correspondence can be understood as which bands can be used for the first carrier and / or the second carrier.

[0253] This can be understood as the switching carrier aggregation capability parameter indicating the corresponding relationship either explicitly or implicitly.

[0254] For the implementation of explicit indication: the switching carrier aggregation capability parameter includes the correspondence. For example, the switching carrier aggregation capability parameter includes second indication information, which is used to indicate the correspondence between the band and the first carrier and / or the second carrier.

[0255] Regarding the implementation of implicit indication: In one case, the indication can be based on the configuration order of the band indices in the carrier aggregation capability parameters. For example, the band corresponding to the first band index is used for the first carrier, that is, the band corresponding to the first band index corresponds to the first carrier; the band corresponding to the second band index is used for the second carrier, that is, the band corresponding to the second band index corresponds to the second carrier; or, the band corresponding to the first band index is used for the second carrier, that is, the band corresponding to the first band index corresponds to the second carrier; and the band corresponding to the second band index is used for the first carrier, that is, the band corresponding to the second band index corresponds to the first carrier. In another scenario, the duplex characteristics of the corresponding spectrum can also be used for indication. For example, a band containing uplink / downlink indices is used for the first carrier (e.g., a duplex mode of FDD or TDD). That is, a band containing uplink / downlink indices corresponds to the first carrier, while a band containing only downlink SDL indices corresponds to the second carrier. For instance, in Table 1, n29, n67, n75, and n76 have SDL duplex mode and can only be used for the second carrier. In Table 1, n5 and n54 have FDD / TDD duplex mode and can be used for the first carrier.

[0256] Table 1. Correspondence between bands and duplex modes

[0257]

[0258]

[0259] Optionally, the network device can also indicate which band is used for the first carrier and which band is used for the second carrier. The understanding between the terminal and the network device is consistent, that is, the network device can directly determine which band is used for which carrier based on the band index reported by the terminal.

[0260] Optionally, the terminal may report one or more handover carrier aggregation capability parameters. When the network device receives multiple handover carrier aggregation capability parameters, it may send an indication to the terminal, indicating the handover carrier aggregation capability parameter used by the terminal (i.e., indicating which handover carrier aggregation capability parameter the terminal uses).

[0261] Optionally, the handover carrier aggregation indication information includes at least one of B11-B14:

[0262] B11, Time-domain information of carrier switching;

[0263] Optionally, the time-domain information of the carrier switching satisfies at least one of B111-B112:

[0264] B111. A time-domain pattern information is configured in the time-domain information of the carrier switching, and the time-domain pattern information is applied to the first carrier and / or the second carrier;

[0265] Optionally, in one case, only one time-domain mode information is configured, and the first indication information indicates that this time-domain mode information is applied to either the first carrier or the second carrier. Correspondingly, the time-domain information applied to the other carrier is the remaining time-domain information excluding the configured time-domain mode information from all the time-domain information. For example, such as... Figure 5 As shown in Option 1, with a configuration period of 28 symbols, a time-domain configuration information contains only symbols 0 to 13 (e.g., the corresponding bit string is "1") and is applied to the second carrier. Then the terminal considers symbols 0 to 13 to be the transmission time of the second carrier, and correspondingly, symbols 14 to 27 are considered to be the transmission time of the first carrier (e.g., the corresponding bit string is not "1").

[0266] Alternatively, in another case, only one time-domain mode information is configured, and the application of this time-domain mode information to the first carrier and the second carrier is indicated by a first indication information display, for example, such as... Figure 5 As shown in option two, a time-domain pattern information contains symbols 0 to 13 (applied to the second carrier, e.g., corresponding to the bit string "2") and symbols 16 to 27 (applied to the first carrier, e.g., corresponding to the bit string "1"). The terminal then considers symbols 0 to 13 to be the transmission time of the second carrier, and correspondingly, symbols 16 to 27 to be the transmission time of the first carrier. Symbols 14 and 15 are used neither for the transmission of the first nor the second carrier. Note: "2" and "1" here can also be other values ​​(such as "0" and "1"), as long as they are different.

[0267] B112. The time-domain information of the carrier switching is configured with two time-domain mode information, wherein one time-domain mode information is applied to the first carrier and the other time-domain mode information is applied to the second carrier.

[0268] Optionally, when two time-domain mode information are configured in the time-domain information of carrier switching, the method further includes:

[0269] If a first symbol exists in both time-domain mode information, the first symbol is determined to be applied to the first carrier or the second carrier for transmission and / or reception based on the priority of the first carrier and the second carrier and / or the priority of the transmitted data.

[0270] The first symbol belongs to one or more overlapping symbols in the two configured time-domain mode information.

[0271] It should be noted that, in the presence of overlapping symbols, the use of overlapping symbols is determined by the priority of the first carrier and the second carrier and / or the priority of the transmitted data. This ensures that overlapping symbols are used accurately for information transmission and guarantees communication reliability.

[0272] It should be noted that in this case, one time-domain mode information is configured for each carrier, i.e., two time-domain mode information are configured. The first indication information displays that one time-domain mode information is applied to the first carrier, and the other time-domain mode information is applied to the second carrier; for example, as... Figure 5 Option 3 shows that two time-domain mode information are configured, with a configuration period of 28 symbols. Time-domain mode information 1 includes symbols 0 to 13 (applied to the second carrier, such as the bit string corresponding to symbols 0 to 13 being "1", and the others being "0"), and time-domain mode information 2 includes symbols 8, 9, and 10, and symbols 16 to 27 (applied to the first carrier, such as symbols 8, 9, and 10, and the bit string corresponding to symbols 16 to 27 being "1", and the bit string corresponding to symbols 0 to 13 being "1", and the others being "0"). The terminal considers symbols 0 to 13 to be the transmission time of the second carrier, and correspondingly, symbols 16 to 27 to be the transmission time of the first carrier. Optionally, symbols 8, 9, and 10 can be determined based on the data priority transmitted on the first carrier or the second carrier. For example, when the terminal needs to send uplink control information (such as Hybrid Automatic Repeat Request Acknowledgment (HARQ-ACK) information or scheduling request information) on the first carrier, symbols 8, 9, and 10 belong to the transmission time of the first carrier; when the first carrier does not transmit control information, symbols 8, 9, and 10 belong to the transmission time of the second carrier.

[0273] It should be noted that, for Figure 5 The symbol index in the table defaults to the symbol index determined by the terminal's downlink reception time. It can also be specified as the symbol index determined by the terminal's uplink transmission time. If there are two symbols not covered by either time-domain mode information (e.g., Y symbols) (e.g., used for transmit / receive handover by default, or TA), the terminal does not perform any transmit / receive operations on these symbols, and the Y value can replace the uplink delay. When the spectrum of the first carrier is a TDD spectrum, its uplink delay can be replaced by the number of X symbols in the TDD uplink / downlink time slot configuration (it should be noted that X symbols here are those that are neither indicated as uplink nor downlink symbols in the TDD time slot configuration).

[0274] B12. First indication information, wherein the first indication information is used to indicate that the time domain information of carrier switching is applied to the first carrier and / or the second carrier;

[0275] B13, Second carrier switching duration;

[0276] It should be noted that the second carrier switching duration configured by the network device is greater than or equal to the first carrier switching duration reported by the terminal; that is, the carrier switching duration configured by the network device should at least meet the terminal's switching capability.

[0277] B14. Uplink delay;

[0278] Optionally, this uplink delay is used to calculate the start / end time of uplink transmission during carrier switching. Optionally, this uplink delay can also be understood as the number of uplink protection symbols.

[0279] Optionally, the uplink delay includes: a maximum uplink delay and a minimum uplink delay; optionally, the maximum uplink delay is greater than the minimum uplink delay.

[0280] Optionally, the unit of uplink latency can be symbols (e.g., minimum uplink latency is G_min symbols, maximum uplink latency is G_max symbols) or other time units (e.g., minimum uplink latency is time TA_min, maximum uplink latency is time TA_max). In this case, the conversion relationship between the two is as follows: dur_OS is the duration of an OFDM symbol.

[0281] Optionally, the carrier switching position satisfies at least one of C11-C13:

[0282] C11, the switching position is to switch the source carrier or switch the target carrier;

[0283] C12, switch the position to the first carrier or the second carrier;

[0284] C13. The switching position is determined according to the priority indicator;

[0285] Optionally, the handover can be performed on a carrier with lower priority, that is, the handover location is a carrier with lower priority; for example, the priority of the first carrier is higher than the priority of the second carrier, and when the handover is performed from the first carrier to the second carrier, the terminal performs the handover process on the second carrier.

[0286] Optionally, when the first carrier is a carrier that the terminal can both receive and transmit on, the second carrier is a carrier that the terminal can receive on, and the method switches from the first carrier to the second carrier, the method further includes:

[0287] The target symbol is determined as the uplink symbol position where the first carrier stops transmitting;

[0288] Optionally, the position at which the uplink symbol stops transmitting can be understood as the position at which the terminal stops transmitting the latest uplink symbol.

[0289] Specifically, the target symbol is at least one of the following: symbol x+P, symbol x; where x is the downlink symbol index for which the switch is performed.

[0290] It should be noted that if the target symbol is symbol x, it means that both uplink and downlink transmissions stop simultaneously. For example, Figure 6 The uplink stops transmitting at symbol #n+4. That is, assuming the downlink symbol during the transmission switch is #n+4, the terminal stops receiving downlink at #n+4 and also stops transmitting uplink at symbol #n+4.

[0291] The method for determining P includes one of D11-D15:

[0292] D11、

[0293] D12

[0294] Optionally, if the switching process is at the beginning of symbol x, formula D11 or D12 is used to determine P.

[0295] D13, P = G;

[0296] D14

[0297] D15

[0298] Optionally, if the switching process is at the end of the symbol x, formula D14 or D15 is used to determine P.

[0299] Without G configured, P is determined using formulas D11 or D14; with G configured, P is determined using formulas D12, D13, or D15.

[0300] For example, if the handover process is at the beginning of symbol x and G is not configured, the terminal can determine P using formula D11 or D12. For example, if the handover process is at the beginning of symbol x and G is configured, the terminal can determine P using formula D12 or D13. For example, if the handover process is at the end of symbol x and G is not configured, P is determined using formula D14. For example, if the handover process is at the end of symbol x and G is configured, P is determined using formula D13 or D15.

[0301] It should be noted that in the above formula, G represents the uplink delay or minimum uplink delay, and the unit is sign. When defined in other units, the conversion described above should be performed. T is the timing advance time; H is the switching duration; dur_OS is the duration of one Orthogonal Frequency Division Multiplexing (OFDM) symbol; This is the floor function.

[0302] like Figure 6 As shown, assume the terminal transmits on the first carrier in downlink symbols n, n+1, n+2, and n+3. According to the configuration instructions, transmission will occur on the second carrier in downlink time slots n+4 to n+9. That is, a carrier switch occurs between downlink symbols n+3 and n+4. Assuming the carrier switch duration is switch_period, the terminal does not transmit on either the first or second carrier during this switch period. Assuming the switch occurs at the beginning of symbol n+4 (the target carrier for switching), the switch begins after the first carrier transmission is completed in symbol n+3. This is to ensure the complete transmission of the first carrier in symbol n+3.

[0303] It should be noted that if an uplink delay is configured, and the uplink delay includes the minimum uplink delay, then the value of T is the value of the minimum uplink delay.

[0304] Optionally, when the first carrier is a carrier that the terminal can both receive and transmit on, the second carrier is a carrier that the terminal can receive on, and the method switches from the first carrier to the second carrier, the method further includes:

[0305] The target symbol is determined as the position of the latest uplink symbol transmitted by the first carrier;

[0306] Optionally, the position of the latest transmitted uplink symbol can be understood as the latest symbol that can be transmitted before the terminal handover, that is, the next symbol after this symbol cannot be transmitted.

[0307] Specifically, the target symbol is at least one of the following: symbol y+P1, symbol y; where y is the last symbol that the carrier (such as the first carrier) before the handover can receive.

[0308] The method for determining P1 includes one of D21-D25:

[0309] D21

[0310] D22、

[0311] D23, P1 = G;

[0312] It should be noted that in the above formula, G represents the uplink delay or minimum uplink delay, and the unit is sign. When defined in other units, the conversion described above should be performed. T is the timing advance time. Here it is assumed that the carrier switching is performed on the switched carrier (e.g., the second carrier).

[0313] Optionally, when the first carrier is a carrier that the terminal can both receive and transmit on, the second carrier is a carrier that the terminal can receive on, and the method switches from the second carrier to the first carrier, the method further includes:

[0314] The uplink symbol position at which the first carrier begins transmission is determined based on x+Q;

[0315] Optionally, the position at which the uplink symbol begins transmission can be understood as the position at which the earliest uplink symbol began transmission.

[0316] Specifically, x is the downlink symbol index for which the switch is performed; Q is determined using one of the methods in E11-E14:

[0317] E11、

[0318] E12

[0319] Alternatively, in the case where the switching process is at the beginning of symbol x, formula E11 or E12 is used to determine Q.

[0320] E13

[0321] E14

[0322] Alternatively, if the switching process is at the end of the symbol x, Q can be determined using formulas E13 or E14.

[0323] Optionally, if G is not configured, Q is determined using formula E11 or E13; if G is configured, Q is determined using formula E12 or E14.

[0324] For example, if the handover process is at the beginning of symbol x and G is not configured, the terminal can use formula E11 to determine Q. For example, if the handover process is at the beginning of symbol x and G is configured, the terminal can use formula E12 to determine Q. For example, if the handover process is at the end of symbol x and G is not configured, Q is determined using formula E13. For example, if the handover process is at the end of symbol x and G is configured, Q is determined using formula E14.

[0325] Optionally, when the first carrier is a carrier that the terminal can both receive and transmit on, the second carrier is a carrier that the terminal can receive on, and the method switches from the second carrier to the first carrier, the method further includes:

[0326] The uplink symbol position at which the first carrier begins transmission is determined based on z+Q1;

[0327] Where z is the index of the earliest downlink symbol received by the carrier after handover (such as the first carrier); the method for determining Q1 includes one of E21-E23:

[0328] E21

[0329] E22

[0330] E23, Q1 = G;

[0331] It should be noted that in the above formula, N is determined based on the uplink lead time (i.e., TA) and / or H, H is the handover duration, dur_OS is the duration of one OFDM symbol, and G is the uplink delay or maximum uplink delay, in symbols. When defined in other units, the conversion described above should be performed. This is a rounding function. It is assumed here that the carrier switching occurs on the carrier before the switching (e.g., the tail of the symbol on the second carrier).

[0332] It should be noted that if an uplink delay is configured, and the uplink delay includes the maximum uplink delay, the uplink lead time is the value of the maximum uplink delay.

[0333] like Figure 7 As shown, assume the terminal transmits on the second carrier in downlink symbols n, n+1, n+2, and n+3. According to the configuration instructions, transmission will occur on the first carrier in downlink time slots n+4 to n+9. That is, a carrier handover occurs between downlink symbols n+3 and n+4. Assuming the carrier handover duration is switch_period, the terminal does not transmit on either the first or second carrier during this handover period. Assuming the handover occurs at the end of symbol n+3 (the handover source carrier), the second carrier handover is completed before the end of symbol n+3. This is to ensure the complete transmission of the first carrier on symbol n+4.

[0334] In actual communication, network devices will adjust the Time Acquisition (TA) based on uplink timing measurements. The specific adjustment amount (delta_TA) is indicated by the network device. The TA value used by the terminal needs to be determined based on the TA value of the most recently effective timeslot to determine the uplink transmission start / end time.

[0335] Furthermore, when a terminal moves, causing a TA adjustment requirement, if the terminal does not receive the TA adjustment change from the network device (or the adjustment amount indicated by the network device cannot fully compensate for the TA requirement), the terminal is allowed to adjust itself (without notifying the network device). This can lead to inconsistencies in the understanding of the TA value between the network device and the terminal. Solutions to this problem include: A) disallowing the terminal from adjusting itself; B) configuring the network device with a maximum TA value TA_max, and the UE using TA_max instead of the aforementioned TA value; C) the terminal reporting the actual TA value used.

[0336] Optionally, when a cell (PCell on the first carrier or SCell on the second carrier) is triggered to perform a Random Access Channel (RACH) procedure, the previously configured carrier handover information is interrupted or suspended; and the terminal returns to carrier state one, and the terminal transmits and receives data in the cell on the first carrier until the RACH is completed and the newly configured activation command is received.

[0337] Optionally, when a cell (PCell on the first carrier or SCell on the second carrier) is configured for semi-static data transmission (e.g., Semi-Persistent Scheduling (SPS) Physical Downlink Shared Channel (PDSCH) transmission), if the SPS PDSCH symbols span the handover symbols, i.e., some symbols are on the carrier of the handover source and other symbols are on the carrier of the handover target, then it can be handled as follows:

[0338] Solution 1: The terminal will not receive / send this semi-static data by default;

[0339] Solution 2: Advance (or delay) the handover time by one or more symbols until the UE can send / receive the corresponding semi-static data completely; Note: At this time, the terminal does not want the problem to occur simultaneously on the first and second carriers.

[0340] Optionally, when the uplink latency of transmission before and after the handover between two cells determined based on the pattern is greater than the handover GAP switch_period, the terminal can select the handover time itself. For example, it can determine the handover location based on the earliest transmission time of the target cell after the handover, that is, complete the handover before the earliest transmission time of the target cell. This can increase the flexibility of network device scheduling. Figure 8As shown, assuming the calculation is based on the network device configuration pattern, the terminal needs to switch from the first carrier to the second carrier to receive data at symbol n+4. According to the reception configuration of the second carrier, the earliest reception time is at symbol n+7 (e.g., performing control channel detection, PDSCH reception, or measurement on n+7). Therefore, the terminal can place the handover on symbol n+6, so that the terminal can receive data scheduled on symbol n+5 (on the first carrier).

[0341] The specific applications of the embodiments of this application are illustrated below with examples.

[0342] Application Scenario 1: The second carrier is n29, the first carrier is n5, taking the FDD band as an example.

[0343] This application scenario uses a single downlink SDL band n29 as the second carrier, a symmetrical spectrum FDD band n5, a subcarrier spacing (SCS) of 15 kHz, and explicitly indicates time-domain pattern information for the second carrier as an example to provide a detailed explanation of the technical solution.

[0344] Specifically, such as Figure 9 As shown, the main implementation process includes:

[0345] Step S901: The terminal reports the handover carrier aggregation capability parameters.

[0346] The terminal reports its ability to perform carrier aggregation through carrier switching, including: the combination of bands (or carriers) that can be switched for carrier aggregation, and the corresponding switching duration Switching_Period.

[0347] Optionally, the configuration format for the reported handover carrier aggregation capability parameters is as follows:

[0348] Switching carrier aggregation capability parameter BandCAbyswitching,

[0349] {

[0350] Band Index -1 = n5: % Explanation: n5 corresponds to the FDD band; uplink frequency range: 824MHz–849MHz; downlink frequency range: 869MHz–894MHz

[0351] Band Index -2 = 29; % Explanation: n5 corresponds to the SDL band; band frequency range: 717MHz–728MHz;

[0352] First carrier switching duration Switching_Period = 140us: % Description: Configures the switching duration when the carriers of the two bands switch. The unit can be symbols or milliseconds. It can be one value or multiple values, such as {35 microseconds, 70 microseconds, 140 microseconds}.

[0353] Switching case is a combination of states that are switched.

[0354] }

[0355] Step S902: Configure network devices to switch carrier aggregation indication information;

[0356] Optionally, the carrier aggregation indication information for this step includes at least one of the following:

[0357] Time-domain information of carrier switching;

[0358] The time-domain information indicating carrier switching is applied to the first indication information of the first carrier and / or the second carrier;

[0359] Second carrier switching duration Switching_Period; % Explanation: This duration is not less than the corresponding first carrier switching duration reported by the terminal;

[0360] Uplink delay, which is used to calculate the start / end time of uplink transmission during carrier switching.

[0361] Specifically, configure the serving cell for the first carrier, which is located at bandIndex-1 = n5; the configuration information includes the following:

[0362] Serving Cell Configuration (SCellConfig) message

[0363] {

[0364] Serving Cell ID (PhysCellId); %The physical layer ID of the serving cell

[0365] Serving cell frequency (frequencyInfoDL = n5; % Defines the frequency / band of the serving cell, corresponding to the n5 band;

[0366] The carrier handover location (BandCAbyswitchingPeriodLocation) = FALSE; % indicates that the handover location is not in this cell (CC-1); correspondingly, cell CC-2 is configured as TRUE;

[0367] Serving cell carrier identifier (BandCAbyswitchingCarrier) carrier-1; % indicates that the cell is CC-1;

[0368] }

[0369] Specifically, configure the serving cell for the second carrier, which is located at bandIndex-2 = N29; the configuration information includes the following:

[0370] Serving Cell Configuration (SCellConfig) message

[0371] {

[0372] Serving Cell ID (PhysCellId); %The physical layer ID of the serving cell

[0373] Serving cell frequency (frequencyInfoDL = n29; % Defines the frequency / band of the serving cell, corresponding to the n5 band;

[0374] The carrier handover location (BandCAbyswitchingPeriodLocation) is TRUE; % indicates that the handover location is not in this cell (CC-1); correspondingly, cell CC-2 is configured as TRUE;

[0375] Serving cell carrier identifier (BandCAbyswitchingCarrier) carrier-2; % indicates that the cell is CC-2;

[0376] Time-domain pattern information (timelist); % Configures the time-domain pattern information used for CC-2;

[0377] The timelist includes the following parameters:

[0378] {

[0379] Period T and offset (periodicityAndOffset) = 10s / 0; % The period is 10 time slots, and the offset is 0;

[0380] Symbol Offset = 0; % This value is in units of sign bits, ranging from 0 to MAX-1, where MAX is the number of signs in the maximum period;

[0381] Duration in Symbols = 4 * 14; % This value is in sign bits and ranges from 1 to MAX-1; MAX is the maximum number of symbols contained in the period.

[0382] Uplink delay = 3 signs; % This value is in sign bits and ranges from 1 to 14 signs.

[0383] }

[0384] In the example above, time-domain pattern information is defined only in the serving cell (i.e., the second carrier) on band number n29, and the configuration effect is as follows: Figure 10 As shown. Figure 10 As shown, a time-domain pattern includes a period T = 10 time slots; where, in the first period T and all subsequent periods, time slots 0 to 3 (symbols 0 to 41) explicitly indicate the application to the second carrier. Then, in the first period T and all subsequent periods, time slots 4-9 implicitly indicate the application to the first carrier.

[0385] It should be noted that, in the above Figure 10 In this configuration, within one cycle (T = 10 time slots), information for one second carrier is configured, while other time slots / symbols represent the first carrier. This means that within one cycle, there is only one switching point between carrier state one and carrier state two. However, in practice, multiple second carrier information can be configured within one cycle, meaning there can be multiple switching points between carrier state one and carrier state two within a single cycle. Figure 11 As shown.

[0386] Step S903: Perform carrier switching.

[0387] According to the information in step S902, the terminal performs carrier switching at the corresponding time, and then transmits on the corresponding carrier. Specifically, according to the configuration in step S902, it is known that carrier switching is performed on the symbol of the second carrier.

[0388] The switching process will be explained in two scenarios below:

[0389] Case 1: The handover is from the first carrier to the second carrier (i.e., from time slot 9 to time slot 10 in the above figure).

[0390] It should be noted that during the switch period (switch_period), the terminal neither sends nor receives data.

[0391] like Figure 12 As shown, the terminal transmits on the first carrier in downlink time slot 9. According to the instruction in step S901, the terminal will transmit on the second carrier after downlink time slot 10. That is, a carrier switch occurs between downlink time slots 9 and 10. The switch occurs at the beginning of symbol 0 in time slot 10 (the target carrier for switching), i.e., the switch begins after symbol 13 in time slot 9 has been transmitted.

[0392] The above scheme assumes that the carrier switching time is determined according to the subframe, time slot, or symbol of the downlink carrier; for the transmission of the uplink symbol of the first carrier, considering the uplink TA factor, the following processing method is adopted:

[0393] Uplink transmission is based on the actual handover time.

[0394] Assume the timing advance time is 1.2 symbols long. The terminal can still transmit on symbol 0 of uplink time slot 10, where T is the timing advance time. This is despite the fact that downlink reception of the first carrier stops after symbols 9 to 13.

[0395] Case 2: Switching from the second carrier to the first carrier.

[0396] It should be noted that during the switch period (switch_period), the terminal neither sends nor receives data.

[0397] like Figure 13 As shown, in downlink time slot 3, the terminal transmits on the second carrier. According to the instruction in step S901, transmission will be performed on the first carrier in downlink time slot 4. That is, a carrier switch occurs between downlink time slots 3 and 4. Assuming the carrier switch duration is switch_period, during this switch period, the terminal does not transmit on either the first or second carrier. The switch occurs at the end of symbol 13 in time slot 3 (the switch source carrier), meaning the second carrier completes the switch before the end of symbol 13 in time slot 3.

[0398] The above scheme assumes that the carrier switching time is determined according to the subframe, time slot, or symbol of the downlink carrier; for the transmission of the uplink symbol of the first carrier, considering the uplink TA factor, the following processing method is adopted:

[0399] Uplink transmission is based on the actual handover time.

[0400] Assuming the timing advance time is 1.2dur_OS, then: That is, the terminal can only start transmitting on the uplink of the first carrier, on symbol 3 of time slot 4, at which point the value of T is equal to the value of the timing advance time. Even though the terminal can start transmitting on symbol 0 of time slot 4.

[0401] Application Scenario 2: Support for more switching state combinations

[0402] In step S901 of application scenario one, the switching state combination Switchingcase supports by default the mutual switching between carrier state one and carrier state two. This means that when this parameter is not configured, it supports the mutual switching between carrier state one and carrier state two by default.

[0403] Furthermore, to support more flexible inter-carrier handover, more handover state combinations, Switchingcase, can be defined and supported based on carrier state one and carrier state two; different handover states are shown in Table 2.

[0404] Table 2 Comparison of different switching states

[0405]

[0406]

[0407] When reporting capabilities at the terminal, it can report based on different band combinations, supporting one or two of the following combinations:

[0408] Combination 1: Switching between carrier state one and carrier state two;

[0409] Combination 2: Switching between carrier state 1 and carrier state 3.

[0410] It should be noted that, for carrier state three, the transmission behavior on the UL resources of the first carrier can be scheduled according to the Downlink Control Information (DCI) indication. When the DCI indicates that transmission is to be performed on the UL resources of CC1, whether reception can be performed simultaneously on the second carrier depends on the UE's capabilities.

[0411] Correspondingly: For step S902 in application scenario one, the time-domain pattern information applied to the second carrier is extended to be applied to carrier state three, that is, to be applied to the reception of the second carrier and the transmission on the UL resources of the first carrier. For example... Figure 14 As shown, Figure 14 In the middle, it is the switch between carrier state one and carrier state two. The DCI schedules PDSCH, and its feedback UCI (such as HARQ-ACK) indication time falls in the time domain of the second carrier in carrier state two. Since the second carrier only has downlink resources and cannot perform any uplink transmission, the terminal cannot complete the transmission of UCI information.

[0412] like Figure 15The diagram illustrates the handover between carrier state one and carrier state three. The DCI scheduler PDSCH's feedback UCI (e.g., HARQ-ACK) indication time falls within the time domain of carrier state three. Since carrier state three includes downlink reception on the second carrier and uplink transmission on the first carrier, the terminal can complete the transmission of UCI information. It should be noted that in this case, whether the terminal can simultaneously receive on the downlink resources of the second carrier while transmitting on the uplink resources of the first carrier depends on the terminal's capabilities, which are not constrained here. However, when network device scheduling is required, the terminal's capabilities must be considered. For example, if the terminal cannot simultaneously receive on the second carrier and transmit on the first carrier, the terminal does not want this situation to occur during network device scheduling or configuration.

[0413] It should be further noted that at least one embodiment of this application enables the terminal to transmit data on multiple frequency bands through steps such as terminal capability reporting, network device configuration switching carrier aggregation parameters, and terminal carrier switching. The requirements for the terminal capability are not high, which enables low-frequency switching carrier aggregation to be implemented and improves the terminal's data transmission experience.

[0414] The technical solutions provided in this application can be applied to various systems, especially 5G systems. For example, applicable systems include Global System for Mobile Communication (GSM), Code Division Multiple Access (CDMA), Wideband Code Division Multiple Access (WCDMA) General Packet Radio Service (GPRS), Long Term Evolution (LTE), LTE Frequency Division Duplex (FDD), LTE Time Division Duplex (TDD), Long Term Evolution Advanced (LTE-A), Universal Mobile Telecommunication System (UMTS), Worldwide Interoperability for Microwave Access (WiMAX), and 5G New Radio (NR). All of these systems include terminals (also called terminal equipment) and network equipment. The systems may also include a core network component, such as Evolved Packet System (EPS) and 5G system (5GS).

[0415] The terminal involved in the embodiments of this application can also be called a terminal device, which can be a device that provides voice and / or data connectivity to a user, a handheld device with wireless connectivity, or other processing devices connected to a wireless modem, etc. The name of the terminal device may also differ in different systems; for example, in a 5G system, the terminal device can be called User Equipment (UE). Wireless terminal devices can communicate with one or more core networks (CNs) via a Radio Access Network (RAN). Wireless terminal devices can be mobile terminal devices, such as mobile phones (or "cellular" phones) and computers with mobile terminal devices, for example, portable, pocket-sized, handheld, computer-embedded, or vehicle-mounted mobile devices, which exchange voice and / or data with the radio access network. Examples include Personal Communication Service (PCS) phones, cordless phones, Session Initiated Protocol (SIP) phones, Wireless Local Loop (WLL) stations, Personal Digital Assistants (PDAs), and other devices. Wireless terminal equipment can also be referred to as a system, subscriber unit, subscriber station, mobile station, mobile station, remote station, access point, remote terminal, access terminal, user terminal, user agent, or user device, but this application does not limit the terminology.

[0416] The network device involved in this application embodiment can be a base station, which may include multiple cells providing services to terminals. Depending on the specific application, a base station may also be called an access point, or a device in an access network that communicates with a wireless terminal device through one or more sectors on the air interface, or other names. The network device can be used to exchange received air frames with Internet Protocol (IP) packets, acting as a router between the wireless terminal device and the rest of the access network, where the rest of the access network may include an Internet Protocol (IP) communication network. The network device can also coordinate the attribute management of the air interface. For example, the network equipment involved in the embodiments of this application can be a base transceiver station (BTS) in a Global System for Mobile communications (GSM) or Code Division Multiple Access (CDMA), a NodeB in a Wide-band Code Division Multiple Access (WCDMA) system, an evolved Node B (eNB or e-NodeB) in a long term evolution (LTE) system, a 5G base station (gNB) in a next generation system, a Home evolved Node B (HeNB), a relay node, a femto, a pico, etc., and is not limited in the embodiments of this application. In some network structures, the network equipment may include centralized unit (CU) nodes and distributed unit (DU) nodes, and the centralized unit and distributed unit may also be geographically separated.

[0417] Network devices and terminal devices can each use one or more antennas for multiple-input multiple-output (MIMO) transmission. MIMO transmission can be single-user MIMO (SU-MIMO) or multiple-user MIMO (MU-MIMO). Depending on the configuration and number of antenna combinations, MIMO transmission can be 2D-MIMO, 3D-MIMO, FD-MIMO, or massive-MIMO, and can also be diversity transmission, precoding transmission, or beamforming transmission, etc.

[0418] like Figure 16 As shown, this application embodiment provides a carrier switching control method, executed by a network device, including:

[0419] Step S1601: Receive the handover carrier aggregation capability parameters sent by the receiving terminal;

[0420] Step S1602: Send a switching carrier aggregation indication message to the terminal according to the switching carrier aggregation capability parameters.

[0421] Optionally, the switching carrier aggregation capability parameters include at least one of the following:

[0422] At least two bands must be used to form a switched carrier aggregation;

[0423] First carrier switching duration;

[0424] A switching state combination, which indicates a carrier state that can be switched.

[0425] Optionally, the switching state combination includes at least one of the following:

[0426] Switching between carrier state one and carrier state two;

[0427] Switching between carrier state one and carrier state three;

[0428] Wherein, carrier state one is used to characterize that the terminal transmits and / or receives only on the first carrier; carrier state two is used to characterize that the terminal receives only on the second carrier; and carrier state three is used to characterize that the terminal receives on the second carrier and transmits on the first carrier.

[0429] Optionally, the switching carrier aggregation capability parameter is used to indicate the correspondence between the band and the first carrier and / or the second carrier;

[0430] Wherein, the first carrier is a carrier that the terminal can receive and transmit, and the second carrier is a carrier that the terminal can receive; or, both the first carrier and the second carrier are carriers that the terminal can receive.

[0431] Optionally, the switching carrier aggregation indication information includes at least one of the following:

[0432] Time-domain information of carrier switching;

[0433] First indication information, the first indication information being used to indicate that time-domain information for carrier switching is applied to the first carrier and / or the second carrier;

[0434] The second carrier switching duration is greater than or equal to the first carrier switching duration reported by the terminal.

[0435] Uplink delay.

[0436] Optionally, the time-domain information of the carrier switching satisfies at least one of the following:

[0437] The time-domain information for carrier switching is configured with a time-domain mode information, which is applied to the first carrier and / or the second carrier.

[0438] The carrier switching time-domain information is configured with two time-domain mode information, wherein one time-domain mode information is applied to the first carrier and the other time-domain mode information is applied to the second carrier.

[0439] Optionally, the uplink delay includes: maximum uplink delay and minimum uplink delay.

[0440] It should be noted that all the implementation methods in the above embodiments are applicable to the embodiments of the carrier switching control method applied to the network device side, and can achieve the same technical effect, so they will not be described again here.

[0441] like Figure 17 As shown, this application embodiment provides a carrier switching device 1700, applied to a terminal, including:

[0442] Reporting unit 1701 is used to report handover carrier aggregation capability parameters;

[0443] The first receiving unit 1702 is used to receive handover carrier aggregation indication information sent by the network device;

[0444] Execution unit 1703 is used to perform carrier switching according to the carrier aggregation indication information, and to transmit and / or receive on the switched carrier;

[0445] During carrier switching, the terminal does not transmit and / or receive.

[0446] Optionally, the switching carrier aggregation capability parameters include at least one of the following:

[0447] At least two bands must be used to form a switched carrier aggregation;

[0448] First carrier switching duration;

[0449] A switching state combination, which indicates a carrier state that can be switched.

[0450] Optionally, the switching state combination includes at least one of the following:

[0451] Switching between carrier state one and carrier state two;

[0452] Switching between carrier state one and carrier state three;

[0453] Wherein, carrier state one is used to characterize that the terminal transmits and / or receives only on the first carrier; carrier state two is used to characterize that the terminal receives only on the second carrier; and carrier state three is used to characterize that the terminal receives on the second carrier and transmits on the first carrier.

[0454] Optionally, the switching carrier aggregation capability parameter is used to indicate the correspondence between the band and the first carrier and / or the second carrier;

[0455] Wherein, the first carrier is a carrier that the terminal can receive and transmit, and the second carrier is a carrier that the terminal can receive; or, both the first carrier and the second carrier are carriers that the terminal can receive.

[0456] Optionally, the switching carrier aggregation indication information includes at least one of the following:

[0457] Time-domain information of carrier switching;

[0458] First indication information, the first indication information being used to indicate that time-domain information for carrier switching is applied to the first carrier and / or the second carrier;

[0459] The second carrier switching duration is greater than or equal to the first carrier switching duration reported by the terminal.

[0460] Uplink delay.

[0461] Optionally, the time-domain information of the carrier switching satisfies at least one of the following:

[0462] The time-domain information for carrier switching is configured with a time-domain mode information, which is applied to the first carrier and / or the second carrier.

[0463] The carrier switching time-domain information is configured with two time-domain mode information, wherein one time-domain mode information is applied to the first carrier and the other time-domain mode information is applied to the second carrier.

[0464] Optionally, if two time-domain mode information are configured in the time-domain information of carrier switching, the apparatus further includes:

[0465] The first determining unit is configured to, if a first symbol exists in two time-domain mode information, determine whether the first symbol is applied to the first carrier or the second carrier for transmission and / or reception based on the priority of the first carrier and the second carrier and / or the priority of the transmitted data.

[0466] The first symbol belongs to one or more overlapping symbols in the two configured time-domain mode information.

[0467] Optionally, the uplink delay includes: maximum uplink delay and minimum uplink delay.

[0468] Optionally, the handover location for carrier switching satisfies at least one of the following:

[0469] The switching position is either switching the source carrier or switching the target carrier;

[0470] Switch the position to the first carrier or the second carrier;

[0471] The location switch is determined based on the priority indicator.

[0472] Optionally, when the first carrier is a carrier that the terminal can both receive and transmit on, the second carrier is a carrier that the terminal can receive on, and the device switches from the first carrier to the second carrier, the device further includes:

[0473] The second determining unit is used to determine the target symbol as the uplink symbol position where the first carrier stops transmitting;

[0474] The target symbol is at least one of the following: symbol x+P, symbol x;

[0475] Where x is the downlink symbol index for the switch;

[0476] The method for determining P includes one of the following:

[0477]

[0478] P = G;

[0479]

[0480]

[0481] Where G is the uplink delay or minimum uplink delay; T is the timing advance time; H is the handover duration; and dur_OS is the duration of one OFDM symbol. This is the floor function.

[0482] Optionally, when the first carrier is a carrier that the terminal can both receive and transmit on, the second carrier is a carrier that the terminal can receive on, and the device switches from the first carrier to the second carrier, the device further includes:

[0483] The third determining unit is used to determine the target symbol as the position of the latest uplink symbol transmitted by the first carrier.

[0484] The target symbol is at least one of the following: symbol y+P1, symbol y;

[0485] Where y is the last symbol that the carrier can receive before the handover;

[0486] The method for determining P1 includes at least one of the following:

[0487]

[0488] P1 = G;

[0489] Where G is the uplink delay or minimum uplink delay; T is the timing advance time; and dur_OS is the duration of an OFDM symbol. This is the floor function.

[0490] Optionally, if an uplink delay is configured, and the uplink delay includes a minimum uplink delay, then the value of T is the value of the minimum uplink delay.

[0491] Optionally, when the first carrier is a carrier that the terminal can both receive and transmit on, the second carrier is a carrier that the terminal can receive on, and the device switches from the second carrier to the first carrier, the device further includes:

[0492] The fourth determining unit is used to determine the uplink symbol position at which the first carrier begins transmission based on x+Q;

[0493] Where x is the downlink symbol index for the switch;

[0494] The methods for determining Q include the following:

[0495]

[0496] Where N is determined based on the uplink advance time and / or H, H is the handover duration, dur_OS is the duration of an OFDM symbol, and G is the uplink delay or maximum uplink delay. This is the floor function.

[0497] Optionally, when the first carrier is a carrier that the terminal can both receive and transmit on, the second carrier is a carrier that the terminal can receive on, and the device switches from the second carrier to the first carrier, the device further includes:

[0498] The fifth determining unit is used to determine the uplink symbol position at which the first carrier begins transmission based on z+Q1;

[0499] Where z is the index of the earliest downlink symbol received by the carrier after the handover;

[0500] The method for determining Q1 includes at least one of the following:

[0501]

[0502] Q1 = G;

[0503] Where N is determined based on the uplink advance time and / or H, H is the handover duration, dur_OS is the duration of an OFDM symbol, and G is the uplink delay or maximum uplink delay. This is the floor function.

[0504] Optionally, if an uplink delay is configured, and the uplink delay includes a maximum uplink delay, the uplink lead time is taken as the value of the maximum uplink delay.

[0505] It should be noted that this device embodiment corresponds one-to-one with the above method embodiments. All implementation methods in the above method embodiments are applicable to this device embodiment and can achieve the same technical effect.

[0506] It should be noted that the division of units in the embodiments of this application is illustrative and only represents one logical functional division. In actual implementation, other division methods may be used. Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated units described above can be implemented in hardware or as software functional units.

[0507] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a processor-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0508] like Figure 18 As shown in the illustration, this application also provides a terminal, including a processor 1800, a transceiver 1810, a memory 1820, and a program stored in the memory 1820 and executable on the processor 1800; wherein the transceiver 1810 is connected to the processor 1800 and the memory 1820 via a bus interface, and the processor 1800 is used to read the program in the memory and execute the following processes:

[0509] Report handover carrier aggregation capability parameters;

[0510] Receive carrier aggregation indication information sent by network devices;

[0511] Carrier switching is performed according to the carrier aggregation indication information, and transmission and / or reception are performed on the switched carrier;

[0512] During carrier switching, the terminal does not transmit and / or receive.

[0513] Transceiver 1810 is used to receive and send data under the control of processor 1800.

[0514] Among them, Figure 18In this context, the bus architecture can include any number of interconnected buses and bridges, specifically linking various circuits of one or more processors represented by processor 1800 and memory represented by memory 1820 together. The bus architecture can also link various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art and therefore will not be described further herein. The bus interface provides an interface. The transceiver 1810 can be multiple components, including transmitters and receivers, providing a unit for communicating with various other devices over a transmission medium, including wireless channels, wired channels, optical fibers, etc. For different user equipment, the user interface 1830 can also be an interface capable of connecting external or internal devices, including but not limited to keypads, displays, speakers, microphones, joysticks, etc.

[0515] The processor 1800 is responsible for managing the bus architecture and general processing, while the memory 1820 can store the data used by the processor 1800 during operation.

[0516] Optionally, the processor 1800 can be a CPU (Central Processing Unit), ASIC (Application Specific Integrated Circuit), FPGA (Field-Programmable Gate Array), or CPLD (Complex Programmable Logic Device), and the processor can also adopt a multi-core architecture.

[0517] The processor executes any of the methods described in the embodiments of this application according to the obtained executable instructions by calling a computer program stored in memory. The processor and memory may also be physically separated.

[0518] Optionally, the switching carrier aggregation capability parameters include at least one of the following:

[0519] At least two bands must be used to form a switched carrier aggregation;

[0520] First carrier switching duration;

[0521] A switching state combination, which indicates a carrier state that can be switched.

[0522] Optionally, the switching state combination includes at least one of the following:

[0523] Switching between carrier state one and carrier state two;

[0524] Switching between carrier state one and carrier state three;

[0525] Wherein, carrier state one is used to characterize that the terminal transmits and / or receives only on the first carrier; carrier state two is used to characterize that the terminal receives only on the second carrier; and carrier state three is used to characterize that the terminal receives on the second carrier and transmits on the first carrier.

[0526] Optionally, the switching carrier aggregation capability parameter is used to indicate the correspondence between the band and the first carrier and / or the second carrier;

[0527] Wherein, the first carrier is a carrier that the terminal can receive and transmit, and the second carrier is a carrier that the terminal can receive; or, both the first carrier and the second carrier are carriers that the terminal can receive.

[0528] Optionally, the switching carrier aggregation indication information includes at least one of the following:

[0529] Time-domain information of carrier switching;

[0530] First indication information, the first indication information being used to indicate that time-domain information for carrier switching is applied to the first carrier and / or the second carrier;

[0531] The second carrier switching duration is greater than or equal to the first carrier switching duration reported by the terminal.

[0532] Uplink delay.

[0533] Optionally, the time-domain information of the carrier switching satisfies at least one of the following:

[0534] The time-domain information for carrier switching is configured with a time-domain mode information, which is applied to the first carrier and / or the second carrier.

[0535] The carrier switching time-domain information is configured with two time-domain mode information, wherein one time-domain mode information is applied to the first carrier and the other time-domain mode information is applied to the second carrier.

[0536] Optionally, when two time-domain mode information are configured in the time-domain information of carrier switching, the processor, for reading the computer program in the memory, further performs the following operations:

[0537] If a first symbol exists in both time-domain mode information, the first symbol is determined to be applied to the first carrier or the second carrier for transmission and / or reception based on the priority of the first carrier and the second carrier and / or the priority of the transmitted data.

[0538] The first symbol belongs to one or more overlapping symbols in the two configured time-domain mode information.

[0539] Optionally, the uplink delay includes: maximum uplink delay and minimum uplink delay.

[0540] Optionally, the handover location for carrier switching satisfies at least one of the following:

[0541] The switching position is either switching the source carrier or switching the target carrier;

[0542] Switch the position to the first carrier or the second carrier;

[0543] The location switch is determined based on the priority indicator.

[0544] Optionally, when the first carrier is a carrier that the terminal can both receive and transmit on, the second carrier is a carrier that the terminal can receive on, and the process switches from the first carrier to the second carrier, the processor, for reading the computer program in the memory, further performs the following operations:

[0545] The target symbol is determined as the uplink symbol position where the first carrier stops transmitting;

[0546] The target symbol is at least one of the following: symbol x+P, symbol x;

[0547] Where x is the downlink symbol index for the switch;

[0548] The method for determining P includes one of the following:

[0549]

[0550] P = G;

[0551]

[0552] Where G is the uplink delay or minimum uplink delay; T is the timing advance time; H is the handover duration; and dur_OS is the duration of one OFDM symbol. This is the floor function.

[0553] Optionally, when the first carrier is a carrier that the terminal can both receive and transmit on, the second carrier is a carrier that the terminal can receive on, and the process switches from the first carrier to the second carrier, the processor, for reading the computer program in the memory, further performs the following operations:

[0554] The target symbol is determined as the position of the latest uplink symbol transmitted by the first carrier;

[0555] The target symbol is at least one of the following: symbol y+P1, symbol y;

[0556] Where y is the last symbol that the carrier can receive before the handover;

[0557] The method for determining P1 includes at least one of the following:

[0558]

[0559] P1 = G;

[0560] Where G is the uplink delay or minimum uplink delay; T is the timing advance time; and dur_OS is the duration of an OFDM symbol. This is the floor function.

[0561] Optionally, if an uplink delay is configured, and the uplink delay includes a minimum uplink delay, then the value of T is the value of the minimum uplink delay.

[0562] Optionally, when the first carrier is a carrier that the terminal can both receive and transmit on, the second carrier is a carrier that the terminal can receive on, and the process switches from the second carrier to the first carrier, the processor, for reading the computer program in the memory, further performs the following operations:

[0563] The uplink symbol position at which the first carrier begins transmission is determined based on x+Q;

[0564] Where x is the downlink symbol index for the switch;

[0565] The methods for determining Q include the following:

[0566]

[0567] Where N is determined based on the uplink advance time and / or H, H is the handover duration, dur_OS is the duration of an OFDM symbol, and G is the uplink delay or maximum uplink delay. This is the floor function.

[0568] Optionally, when the first carrier is a carrier that the terminal can both receive and transmit on, the second carrier is a carrier that the terminal can receive on, and the process switches from the second carrier to the first carrier, the processor, for reading the computer program in the memory, further performs the following operations:

[0569] The uplink symbol position at which the first carrier begins transmission is determined based on z+Q1;

[0570] Where z is the index of the earliest downlink symbol received by the carrier after the handover;

[0571] The method for determining Q1 includes at least one of the following:

[0572]

[0573] Q1 = G;

[0574] Where N is determined based on the uplink advance time and / or H, H is the handover duration, dur_OS is the duration of an OFDM symbol, and G is the uplink delay or maximum uplink delay. This is the floor function.

[0575] Optionally, if an uplink delay is configured, and the uplink delay includes a maximum uplink delay, the uplink lead time is taken as the value of the maximum uplink delay.

[0576] It should be noted that the terminal provided in this application embodiment can implement all the method steps implemented in the above method embodiment and can achieve the same technical effect. Here, the parts that are the same as those in the method embodiment and the beneficial effects will not be described in detail.

[0577] This application also provides a computer-readable storage medium storing a computer program thereon, wherein the computer program, when executed by a processor, implements the steps of a carrier switching method applied to a terminal. The processor-readable storage medium can be any available medium or data storage device accessible to the processor, including but not limited to magnetic storage (e.g., floppy disks, hard disks, magnetic tapes, magneto-optical disks (MO), etc.), optical storage (e.g., CDs, DVDs, BDs, HVDs, etc.), and semiconductor storage (e.g., ROMs, EPROMs, EEPROMs, non-volatile memory (NAND flash), solid-state drives (SSDs), etc.).

[0578] like Figure 19 As shown, this application embodiment provides a carrier switching control device 1900, applied to network equipment, including:

[0579] The transmitting unit 1901 is used to receive the switching carrier aggregation capability parameters transmitted by the terminal;

[0580] Based on the switching carrier aggregation capability parameters, a switching carrier aggregation indication message is sent to the terminal.

[0581] Optionally, the switching carrier aggregation capability parameters include at least one of the following:

[0582] At least two bands must be used to form a switched carrier aggregation;

[0583] First carrier switching duration;

[0584] A switching state combination, which indicates a carrier state that can be switched.

[0585] Optionally, the switching state combination includes at least one of the following:

[0586] Switching between carrier state one and carrier state two;

[0587] Switching between carrier state one and carrier state three;

[0588] Wherein, carrier state one is used to characterize that the terminal transmits and / or receives only on the first carrier; carrier state two is used to characterize that the terminal receives only on the second carrier; and carrier state three is used to characterize that the terminal receives on the second carrier and transmits on the first carrier.

[0589] Optionally, the switching carrier aggregation capability parameter is used to indicate the correspondence between the band and the first carrier and / or the second carrier;

[0590] Wherein, the first carrier is a carrier that the terminal can receive and transmit, and the second carrier is a carrier that the terminal can receive; or, both the first carrier and the second carrier are carriers that the terminal can receive.

[0591] Optionally, the switching carrier aggregation indication information includes at least one of the following:

[0592] Time-domain information of carrier switching;

[0593] First indication information, the first indication information being used to indicate that time-domain information for carrier switching is applied to the first carrier and / or the second carrier;

[0594] The second carrier switching duration is greater than or equal to the first carrier switching duration reported by the terminal.

[0595] Uplink delay.

[0596] Optionally, the time-domain information of the carrier switching satisfies at least one of the following:

[0597] The time-domain information for carrier switching is configured with a time-domain mode information, which is applied to the first carrier and / or the second carrier.

[0598] The carrier switching time-domain information is configured with two time-domain mode information, wherein one time-domain mode information is applied to the first carrier and the other time-domain mode information is applied to the second carrier.

[0599] Optionally, the uplink delay includes: maximum uplink delay and minimum uplink delay.

[0600] It should be noted that this device embodiment corresponds one-to-one with the above method embodiments. All implementation methods in the above method embodiments are applicable to this device embodiment and can achieve the same technical effect.

[0601] It should be noted that the division of units in the embodiments of this application is illustrative and only represents one logical functional division. In actual implementation, other division methods may be used. Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated units described above can be implemented in hardware or as software functional units.

[0602] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a processor-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0603] like Figure 20 As shown in the illustration, this application embodiment also provides a network device, including a processor 2000, a transceiver 2010, a memory 2020, and a program stored in the memory 2020 and executable on the processor 2000; wherein the transceiver 2010 is connected to the processor 2000 and the memory 2020 via a bus interface, wherein the processor 2000 is used to read the program in the memory and execute the following process: wherein the processor is used to read the computer program in the memory and perform the following operations:

[0604] The receiving terminal sends the switching carrier aggregation capability parameters;

[0605] Based on the switching carrier aggregation capability parameters, a switching carrier aggregation indication message is sent to the terminal.

[0606] Transceiver 2010 is used to receive and send data under the control of processor 2000.

[0607] Among them, Figure 20In this context, the bus architecture can include any number of interconnected buses and bridges, specifically linking various circuits of one or more processors represented by processor 2000 and memory represented by memory 2020 together. The bus architecture can also link various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art and therefore will not be described further herein. The bus interface provides an interface. The transceiver 2010 can be multiple elements, including transmitters and receivers, providing units for communicating with various other devices over a transmission medium, including wireless channels, wired channels, optical fibers, and other transmission media.

[0608] The processor 2000 is responsible for managing the bus architecture and general processing, while the memory 2020 can store the data used by the processor 2000 when performing operations.

[0609] Optionally, the processor 2000 can be a CPU (Central Processing Unit), ASIC (Application Specific Integrated Circuit), FPGA (Field-Programmable Gate Array), or CPLD (Complex Programmable Logic Device), and the processor can also adopt a multi-core architecture.

[0610] The processor executes any of the methods described in the embodiments of this application according to the obtained executable instructions by calling a computer program stored in memory. The processor and memory may also be physically separated.

[0611] Optionally, the switching carrier aggregation capability parameters include at least one of the following:

[0612] At least two bands must be used to form a switched carrier aggregation;

[0613] First carrier switching duration;

[0614] A switching state combination, which indicates a carrier state that can be switched.

[0615] Optionally, the switching state combination includes at least one of the following:

[0616] Switching between carrier state one and carrier state two;

[0617] Switching between carrier state one and carrier state three;

[0618] In the carrier state one scenario, the terminal only transmits and / or receives on the first carrier; in the carrier state two scenario, the terminal only receives on the second carrier; and in the carrier state three scenario, the terminal receives on the second carrier and transmits on the first carrier.

[0619] Optionally, the switching carrier aggregation capability parameter is used to indicate the correspondence between the band and the first carrier and / or the second carrier;

[0620] Wherein, the first carrier is a carrier that the terminal can receive and transmit, and the second carrier is a carrier that the terminal can receive; or, both the first carrier and the second carrier are carriers that the terminal can receive.

[0621] Optionally, the switching carrier aggregation indication information includes at least one of the following:

[0622] Time-domain information of carrier switching;

[0623] First indication information, the first indication information being used to indicate that time-domain information for carrier switching is applied to the first carrier and / or the second carrier;

[0624] The second carrier switching duration is greater than or equal to the first carrier switching duration reported by the terminal.

[0625] Uplink delay.

[0626] Optionally, the time-domain information of the carrier switching satisfies at least one of the following:

[0627] The time-domain information for carrier switching is configured with a time-domain mode information, which is applied to the first carrier and / or the second carrier.

[0628] The carrier switching time-domain information is configured with two time-domain mode information, wherein one time-domain mode information is applied to the first carrier and the other time-domain mode information is applied to the second carrier.

[0629] Optionally, the uplink delay includes: maximum uplink delay and minimum uplink delay.

[0630] It should be noted that the network device provided in this application embodiment can implement all the method steps implemented in the above method embodiment and can achieve the same technical effect. Here, the parts that are the same as those in the method embodiment and the beneficial effects will not be described in detail.

[0631] This application also provides a computer-readable storage medium storing a computer program thereon, wherein the computer program, when executed by a processor, implements the steps of a carrier switching control method applied to a network device. The processor-readable storage medium can be any available medium or data storage device accessible to the processor, including but not limited to magnetic storage (e.g., floppy disks, hard disks, magnetic tapes, magneto-optical disks (MO), etc.), optical storage (e.g., CDs, DVDs, BDs, HVDs, etc.), and semiconductor storage (e.g., ROMs, EPROMs, EEPROMs, non-volatile memory (NAND flash), solid-state drives (SSDs), etc.).

[0632] This application also provides a computer program product, including computer instructions. When these computer instructions are executed by a processor, they implement the various processes in the above method embodiments and achieve the same technical effects. To avoid repetition, they will not be described again here.

[0633] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product implemented on one or more computer-usable storage media (including, but not limited to, disk storage and optical storage) containing computer-usable program code.

[0634] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer-executable instructions. These computer-executable instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0635] These processor-executable instructions may also be stored in a processor-readable memory that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the processor-readable memory produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0636] These processors can execute instructions that can also be loaded onto a computer or other programmable data processing device, causing a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable device for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0637] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A carrier switching method, characterized in that, Applied to terminals, including: Report handover carrier aggregation capability parameters; Receive carrier aggregation indication information sent by network devices; Carrier switching is performed according to the carrier aggregation indication information, and transmission and / or reception are performed on the switched carrier; During carrier switching, the terminal does not transmit and / or receive.

2. The method according to claim 1, characterized in that, The switching carrier aggregation capability parameters include at least one of the following: At least two bands must be used to form a switched carrier aggregation; First carrier switching duration; A switching state combination, which indicates a carrier state that can be switched.

3. The method according to claim 2, characterized in that, The switching state combination includes at least one of the following: Switching between carrier state one and carrier state two; Switching between carrier state one and carrier state three; Wherein, carrier state one is used to characterize that the terminal transmits and / or receives only on the first carrier; carrier state two is used to characterize that the terminal receives only on the second carrier; and carrier state three is used to characterize that the terminal receives on the second carrier and transmits on the first carrier.

4. The method according to claim 1 or 2, characterized in that, The switching carrier aggregation capability parameter is used to indicate the correspondence between the band and the first carrier and / or the second carrier; Wherein, the first carrier is a carrier that the terminal can receive and transmit, and the second carrier is a carrier that the terminal can receive; or, both the first carrier and the second carrier are carriers that the terminal can receive.

5. The method according to claim 1, characterized in that, The switching carrier aggregation indication information includes at least one of the following: Time-domain information of carrier switching; First indication information, the first indication information being used to indicate that time-domain information for carrier switching is applied to the first carrier and / or the second carrier; The second carrier switching duration is greater than or equal to the first carrier switching duration reported by the terminal. Uplink delay.

6. The method according to claim 5, characterized in that, The time-domain information of the carrier switching satisfies at least one of the following: The time-domain information for carrier switching is configured with a time-domain mode information, which is applied to the first carrier and / or the second carrier. The carrier switching time-domain information is configured with two time-domain mode information, wherein one time-domain mode information is applied to the first carrier and the other time-domain mode information is applied to the second carrier.

7. The method according to claim 6, characterized in that, When configuring two time-domain mode information in the time-domain information of carrier switching, the method further includes: If a first symbol exists in both time-domain mode information, the first symbol is determined to be applied to the first carrier or the second carrier for transmission and / or reception based on the priority of the first carrier and the second carrier and / or the priority of the transmitted data. The first symbol belongs to one or more overlapping symbols in the two configured time-domain mode information.

8. The method according to claim 5, characterized in that, The uplink latency includes: maximum uplink latency and minimum uplink latency.

9. The method according to claim 1, characterized in that, The handover location for carrier switching must satisfy at least one of the following: The switching position is either switching the source carrier or switching the target carrier; Switch the position to the first carrier or the second carrier; The location switch is determined based on the priority indicator.

10. The method according to claim 1, characterized in that, When the first carrier is a carrier that the terminal can both receive and transmit on, the second carrier is a carrier that the terminal can receive on, and the method switches from the first carrier to the second carrier, the method further includes: The target symbol is determined as the uplink symbol position where the first carrier stops transmitting; The target symbol is at least one of the following: symbol x+P, symbol x; Where x is the downlink symbol index for the switch; The method for determining P includes one of the following: P = G; Where G is the uplink delay or minimum uplink delay; T is the timing advance time; H is the handover duration; and dur_OS is the duration of one OFDM symbol. This is the floor function.

11. The method according to claim 1, characterized in that, When the first carrier is a carrier that the terminal can both receive and transmit on, the second carrier is a carrier that the terminal can receive on, and the method switches from the first carrier to the second carrier, the method further includes: The target symbol is determined as the position of the latest uplink symbol transmitted by the first carrier; The target symbol is at least one of the following: symbol y+P1, symbol y; Where y is the last symbol that the carrier can receive before the handover; The method for determining P1 includes at least one of the following: P1 = G; Where G is the uplink delay or minimum uplink delay; T is the timing advance time; and dur_OS is the duration of an OFDM symbol. This is the floor function.

12. The method according to claim 10 or 11, characterized in that, If an uplink delay is configured, and the uplink delay includes the minimum uplink delay, then the value of T is the value of the minimum uplink delay.

13. The method according to claim 1, characterized in that, When the first carrier is a carrier that the terminal can both receive and transmit on, the second carrier is a carrier that the terminal can receive on, and the method switches from the second carrier to the first carrier, the method further includes: The uplink symbol position at which the first carrier begins transmission is determined based on x+Q; Where x is the downlink symbol index for the switch; The methods for determining Q include the following: Where N is determined based on the uplink advance time and / or H, H is the handover duration, dur_OS is the duration of an OFDM symbol, and G is the uplink delay or maximum uplink delay. This is the floor function.

14. The method according to claim 1, characterized in that, When the first carrier is a carrier that the terminal can both receive and transmit on, the second carrier is a carrier that the terminal can receive on, and the method switches from the second carrier to the first carrier, the method further includes: The uplink symbol position at which the first carrier begins transmission is determined based on z+Q1; Where z is the index of the earliest downlink symbol received by the carrier after the handover; The method for determining Q1 includes at least one of the following: Q1 = G; Where N is determined based on the uplink advance time and / or H, H is the handover duration, dur_OS is the duration of an OFDM symbol, and G is the uplink delay or maximum uplink delay. This is the floor function.

15. The method according to claim 13 or 14, characterized in that, If an uplink delay is configured, and the uplink delay includes the maximum uplink delay, the uplink lead time is the value of the maximum uplink delay.

16. A carrier switching control method, characterized in that, Applied to network devices, including: The receiving terminal sends the switching carrier aggregation capability parameters; Based on the switching carrier aggregation capability parameters, a switching carrier aggregation indication message is sent to the terminal.

17. The method according to claim 16, characterized in that, The switching carrier aggregation capability parameters include at least one of the following: At least two bands must be used to form a switched carrier aggregation; First carrier switching duration; A switching state combination, which indicates a carrier state that can be switched.

18. The method according to claim 17, characterized in that, The switching state combination includes at least one of the following: Switching between carrier state one and carrier state two; Switching between carrier state one and carrier state three; Wherein, carrier state one is used to characterize that the terminal transmits and / or receives only on the first carrier; carrier state two is used to characterize that the terminal receives only on the second carrier; and carrier state three is used to characterize that the terminal receives on the second carrier and transmits on the first carrier.

19. The method according to claim 16 or 17, characterized in that, The switching carrier aggregation capability parameter is used to indicate the correspondence between the band and the first carrier and / or the second carrier; Wherein, the first carrier is a carrier that the terminal can receive and transmit, and the second carrier is a carrier that the terminal can receive; or, both the first carrier and the second carrier are carriers that the terminal can receive.

20. The method according to claim 16, characterized in that, The switching carrier aggregation indication information includes at least one of the following: Time-domain information of carrier switching; First indication information, the first indication information being used to indicate that time-domain information for carrier switching is applied to the first carrier and / or the second carrier; The second carrier switching duration is greater than or equal to the first carrier switching duration reported by the terminal. Uplink delay.

21. The method according to claim 20, characterized in that, The time-domain information of the carrier switching satisfies at least one of the following: The time-domain information for carrier switching is configured with a time-domain mode information, which is applied to the first carrier and / or the second carrier. The carrier switching time-domain information is configured with two time-domain mode information, wherein one time-domain mode information is applied to the first carrier and the other time-domain mode information is applied to the second carrier.

22. The method according to claim 20, characterized in that, The uplink latency includes: maximum uplink latency and minimum uplink latency.

23. A terminal, characterized in that, Includes memory, transceiver, and processor: A memory for storing computer programs; a transceiver for sending and receiving data under the control of the processor; and a processor for reading the computer programs from the memory and performing the following operations: Report handover carrier aggregation capability parameters; Receive carrier aggregation indication information sent by network devices; Carrier switching is performed according to the carrier aggregation indication information, and transmission and / or reception are performed on the switched carrier; During carrier switching, the terminal does not transmit and / or receive.

24. The terminal according to claim 23, characterized in that, The switching carrier aggregation capability parameters include at least one of the following: At least two bands must be used to form a switched carrier aggregation; First carrier switching duration; A switching state combination, which indicates a carrier state that can be switched.

25. The terminal according to claim 24, characterized in that, The switching state combination includes at least one of the following: Switching between carrier state one and carrier state two; Switching between carrier state one and carrier state three; Wherein, carrier state one is used to characterize that the terminal transmits and / or receives only on the first carrier; carrier state two is used to characterize that the terminal receives only on the second carrier; and carrier state three is used to characterize that the terminal receives on the second carrier and transmits on the first carrier.

26. The terminal according to claim 23 or 24, characterized in that, The switching carrier aggregation capability parameter is used to indicate the correspondence between the band and the first carrier and / or the second carrier; Wherein, the first carrier is a carrier that the terminal can receive and transmit, and the second carrier is a carrier that the terminal can receive; or, both the first carrier and the second carrier are carriers that the terminal can receive.

27. The terminal according to claim 23, characterized in that, The switching carrier aggregation indication information includes at least one of the following: Time-domain information of carrier switching; First indication information, the first indication information being used to indicate that time-domain information for carrier switching is applied to the first carrier and / or the second carrier; The second carrier switching duration is greater than or equal to the first carrier switching duration reported by the terminal. Uplink delay.

28. The terminal according to claim 27, characterized in that, The time-domain information of the carrier switching satisfies at least one of the following: The time-domain information for carrier switching is configured with a time-domain mode information, which is applied to the first carrier and / or the second carrier. The carrier switching time-domain information is configured with two time-domain mode information, wherein one time-domain mode information is applied to the first carrier and the other time-domain mode information is applied to the second carrier.

29. The terminal according to claim 28, characterized in that, When two time-domain mode information are configured in the time-domain information of carrier switching, the processor, for reading the computer program in the memory, also performs the following operations: If a first symbol exists in both time-domain mode information, the first symbol is determined to be applied to the first carrier or the second carrier for transmission and / or reception based on the priority of the first carrier and the second carrier and / or the priority of the transmitted data. The first symbol belongs to one or more overlapping symbols in the two configured time-domain mode information.

30. The terminal according to claim 27, characterized in that, The uplink latency includes: maximum uplink latency and minimum uplink latency.

31. The terminal according to claim 23, characterized in that, The handover location for carrier switching must satisfy at least one of the following: The switching position is either switching the source carrier or switching the target carrier; Switch the position to the first carrier or the second carrier; The location switch is determined based on the priority indicator.

32. The terminal according to claim 23, characterized in that, When the first carrier is a carrier that the terminal can both receive and transmit on, and the second carrier is a carrier that the terminal can receive on, and the processor switches from the first carrier to the second carrier, the processor, for reading the computer program in the memory, further performs the following operations: The target symbol is determined as the uplink symbol position where the first carrier stops transmitting; The target symbol is at least one of the following: symbol x+P, symbol x; Where x is the downlink symbol index for the switch; The method for determining P includes one of the following: P = G; Where G is the uplink delay or minimum uplink delay; T is the timing advance time; H is the handover duration; and dur_OS is the duration of one OFDM symbol. This is the floor function.

33. The terminal according to claim 23, characterized in that, When the first carrier is a carrier that the terminal can both receive and transmit on, and the second carrier is a carrier that the terminal can receive on, and the processor switches from the first carrier to the second carrier, the processor, for reading the computer program in the memory, further performs the following operations: The target symbol is determined as the position of the latest uplink symbol transmitted by the first carrier; The target symbol is at least one of the following: symbol y+P1, symbol y; Where y is the last symbol that the carrier can receive before the handover; The method for determining P1 includes at least one of the following: P1 = G; Where G is the uplink delay or minimum uplink delay; T is the timing advance time; and dur_OS is the duration of an OFDM symbol. This is the floor function.

34. The terminal according to claim 32 or 33, characterized in that, If an uplink delay is configured, and the uplink delay includes the minimum uplink delay, then the value of T is the value of the minimum uplink delay.

35. The terminal according to claim 23, characterized in that, When the first carrier is a carrier that the terminal can both receive and transmit on, the second carrier is a carrier that the terminal can receive on, and the process switches from the second carrier to the first carrier, the processor, for reading the computer program in the memory, further performs the following operations: The uplink symbol position at which the first carrier begins transmission is determined based on x+Q; Where x is the downlink symbol index for the switch; The methods for determining Q include the following: Where N is determined based on the uplink advance time and / or H, H is the handover duration, dur_OS is the duration of an OFDM symbol, and G is the uplink delay or maximum uplink delay. This is the floor function.

36. The terminal according to claim 23, characterized in that, When the first carrier is a carrier that the terminal can both receive and transmit on, the second carrier is a carrier that the terminal can receive on, and the process switches from the second carrier to the first carrier, the processor, for reading the computer program in the memory, further performs the following operations: The uplink symbol position at which the first carrier begins transmission is determined based on z+Q1; Where z is the index of the earliest downlink symbol received by the carrier after the handover; The method for determining Q1 includes at least one of the following: Q1 = G; Where N is determined based on the uplink advance time and / or H, H is the handover duration, dur_OS is the duration of an OFDM symbol, and G is the uplink delay or maximum uplink delay. This is the floor function.

37. The terminal according to claim 35 or 36, characterized in that, If an uplink delay is configured, and the uplink delay includes the maximum uplink delay, the uplink lead time is the value of the maximum uplink delay.

38. A network device, characterized in that, Includes memory, transceiver, and processor: A memory for storing computer programs; a transceiver for sending and receiving data under the control of the processor; and a processor for reading the computer programs from the memory and performing the following operations: The receiving terminal sends the switching carrier aggregation capability parameters; Based on the switching carrier aggregation capability parameters, a switching carrier aggregation indication message is sent to the terminal.

39. A carrier switching device, applied to a terminal, characterized in that, include: The reporting unit is used to report handover carrier aggregation capability parameters; The first receiving unit is used to receive handover carrier aggregation indication information sent by the network device; An execution unit is configured to perform carrier switching according to the carrier aggregation indication information, and to transmit and / or receive on the switched carrier; During carrier switching, the terminal does not transmit and / or receive.

40. A carrier switching control device, applied to network equipment, characterized in that, include: The second receiving unit is used to receive the switching carrier aggregation capability parameters sent by the terminal; The transmitting unit is used to send a switching carrier aggregation indication information to the terminal according to the switching carrier aggregation capability parameters.

41. A processor-readable storage medium, characterized in that, The processor-readable storage medium stores a computer program for causing the processor to perform the method according to any one of claims 1 to 22.

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