Frequency band switching method, device, system and computer readable storage medium

Abstract

The present disclosure relates to a frequency band switching method, device, system and computer readable storage medium, and relates to the technical field of communication. The frequency band switching method comprises: configuring, according to at least one of a transmission period of CSI or a transmission period of SSB, periodic switching configuration information of a terminal in a first frequency band and a second frequency band; and transmitting the periodic switching configuration information to the terminal, so that the terminal performs periodic switching between the first frequency band and the second frequency band according to the periodic switching configuration information. The technical scheme of the present disclosure can avoid interference, thereby improving communication performance.

Description

Technical Field

[0001] This disclosure relates to the field of communication technology, and in particular to a frequency band switching method, frequency band switching device, frequency band switching system, and computer-readable storage medium. Background Technology

[0002] When an operator's spectrum has multiple dispersed, small-bandwidth carriers in the low or mid-frequency range, multi-carrier enhancement technology is mainly used to address the technical problem of how to efficiently integrate and utilize these spectrums.

[0003] In related technologies, multi-carrier enhancement techniques mainly include methods such as saving common overhead, flexible scheduling, and spectrum pooling. For example, multi-carrier enhancement can be achieved by aggregating bands of different frequencies. Summary of the Invention

[0004] The inventors of this disclosure have discovered the following problem in the aforementioned related technologies: there is interference between frequency bands of different frequencies, which leads to a decrease in communication performance.

[0005] In view of this, this disclosure proposes a frequency band switching technology solution that can avoid interference and thus improve communication performance.

[0006] According to some embodiments of this disclosure, a frequency band switching method on the base station side is provided, including: configuring periodic switching configuration information of a terminal in a first frequency band and a second frequency band according to at least one of the transmission period of CSI (Channel-State Information) or the transmission period of SSB (Synchronization Signal / PBCH Block); and sending the periodic switching configuration information to the terminal so that the terminal can periodically switch between the first frequency band and the second frequency band according to the periodic switching configuration information.

[0007] In some embodiments, configuring the periodic switching configuration information of the terminal in the first frequency band and the second frequency band includes: configuring the periodic switching configuration information of the terminal in the uplink transmission in the first frequency band and the downlink transmission in the second frequency band according to at least one of the transmission period of the uplink channel state information or the transmission period of the downlink synchronization signal block.

[0008] In some embodiments, the periodic switching configuration information ensures that the terminal's downlink transmission cycle includes at least one complete CSI-RS (Channel-State Information Reference Signal) and / or at least one complete synchronization signal block.

[0009] In some embodiments, configuring the periodic switching configuration information for the uplink transmission in the first frequency band and the downlink transmission in the second frequency band includes: configuring the periodic switching configuration information according to the transmission period of the reference signal of the channel state information and the transmission period of the synchronization signal block when the channel state information is periodically transmitted and the synchronization signal block is also periodically transmitted.

[0010] In some embodiments, the periodic switching configuration information includes a switching period. Configuring the periodic switching configuration information according to the transmission period of the reference signal of the channel state information and the transmission period of the synchronization signal block includes configuring the switching period as an integer multiple of the maximum value of the transmission period of the reference signal of the channel state information and the transmission period of the synchronization signal block.

[0011] In some embodiments, the periodic switching configuration information includes a switching period. The periodic switching configuration information for configuring the terminal's uplink transmission in the first frequency band and downlink transmission in the second frequency band includes at least one of the following: when the channel state information is transmitted non-periodically and the synchronization signal block is transmitted periodically, the switching period is configured according to the transmission period of the synchronization signal block; or when the channel state information is transmitted periodically and the state of the synchronization signal block is default, the switching period is configured according to the transmission period of the reference signal of the channel state information.

[0012] In some embodiments, configuring the switching period according to the transmission period of the synchronization signal block includes: configuring the switching period as an integer multiple of the transmission period of the synchronization signal block; configuring the switching period according to the transmission period of the reference signal of the channel state information includes: configuring the switching period as an integer multiple of the transmission period of the reference signal of the channel state information.

[0013] In some embodiments, the periodic switching configuration information includes a switching start reference time. Based on the transmission period of the reference signal of the channel state information and the transmission period of the synchronization signal block, configuring the periodic switching configuration information includes: configuring the switching start reference time based on the first transmission time of the reference signal of the channel state information and the second transmission time of the synchronization signal block, wherein the second transmission time is the next transmission time adjacent to the first transmission time.

[0014] In some embodiments, configuring the handover start reference time based on the first transmission time of the channel state information reference signal and the second transmission time of the synchronization signal block includes: determining the handover start reference time based on the second transmission time when the transmission period of the synchronization signal block is greater than or equal to the transmission period of the channel state information reference signal; and determining the handover start reference time based on the first transmission time when the transmission period of the synchronization signal block is less than the transmission period of the channel state information reference signal.

[0015] In some embodiments, the periodic switching configuration information includes a switching start reference time. The periodic switching configuration information for configuring the terminal's uplink transmission in the first frequency band and downlink transmission in the second frequency band includes at least one of the following: when the channel state information is periodically transmitted and the state of the synchronization signal block is default, configuring the switching start reference time according to the first transmission time of the reference signal of the channel state information; or when the channel state information is non-periodic transmitted and the synchronization signal block is periodically transmitted, configuring the switching start reference time according to the second transmission time of the synchronization signal block, wherein the second transmission time is the next transmission time adjacent to the first transmission time.

[0016] In some embodiments, the periodic switching configuration information includes a switching period. Configuring the periodic switching configuration information of the terminal in the first frequency band and the second frequency band includes configuring the switching period based on the frequency band switching capability information reported by the terminal.

[0017] In some embodiments, the frequency band switching capability information includes the shortest switching period supported by the terminal, and the switching period is greater than the shortest switching period.

[0018] In some embodiments, the frequency band switching method further includes: sending initial switching status information to the terminal, wherein the initial switching status information is used to indicate the operating status of the terminal in the first frequency band and the second frequency band at the switching start reference time point.

[0019] According to some other embodiments of this disclosure, a frequency band switching method on the terminal side is provided, including: receiving periodic switching configuration information of the terminal in a first frequency band and a second frequency band sent by a base station, wherein the periodic switching configuration information is configured according to at least one of the transmission period of channel state information or the transmission period of synchronization signal block; and performing periodic switching between the first frequency band and the second frequency band according to the periodic switching configuration information.

[0020] In some embodiments, the periodic switching configuration information is configured according to at least one of the transmission period of uplink channel state information or the transmission period of downlink synchronization signal block, and the periodic switching configuration information is the periodic switching configuration information of the terminal for uplink transmission in the first frequency band and downlink transmission in the second frequency band.

[0021] In some embodiments, the periodic switching configuration information ensures that the downlink transmission cycle of the terminal includes at least one complete channel state information reference signal and / or at least one complete synchronization signal block.

[0022] In some embodiments, when the channel state information is periodically transmitted and the synchronization signal block is also periodically transmitted, the periodic switching configuration information is configured according to the transmission period of the reference signal of the channel state information and the transmission period of the synchronization signal block.

[0023] In some embodiments, the periodic switching configuration information includes a switching period, which is configured as an integer multiple of the maximum value of the transmission period of the reference signal of the channel state information and the transmission period of the synchronization signal block.

[0024] In some embodiments, the periodic switching configuration information includes a switching period. When the channel state information is transmitted aperiodically and the synchronization signal block is transmitted periodically, the switching period is configured according to the transmission period of the synchronization signal block; and / or when the channel state information is transmitted periodically and the state of the synchronization signal block is default, the switching period is configured according to the transmission period of the reference signal of the channel state information.

[0025] In some embodiments, the switching period is configured as an integer multiple of the transmission period of the synchronization signal block; and / or the switching period is configured as an integer multiple of the transmission period of the reference signal for the channel state information.

[0026] In some embodiments, the periodic switching configuration information includes a switching start reference time, which is configured based on the first transmission time of the reference signal of the channel state information and the second transmission time of the synchronization signal block, wherein the second transmission time is the next transmission time adjacent to the first transmission time.

[0027] In some embodiments, when the transmission period of the synchronization signal block is greater than or equal to the transmission period of the reference signal for the channel state information, the switching start reference time is determined according to the second transmission time; when the transmission period of the synchronization signal block is less than the transmission period of the reference signal for the channel state information, the switching start reference time is determined according to the first transmission time.

[0028] In some embodiments, the periodic switching configuration information includes a switching start reference time. When the channel state information is periodically transmitted and the state of the synchronization signal block is default, the switching start reference time is configured according to the first transmission time of the reference signal of the channel state information; and / or when the channel state information is non-periodic transmitted and the synchronization signal block is periodically transmitted, the switching start reference time is configured according to the second transmission time of the synchronization signal block, wherein the second transmission time is the next transmission time adjacent to the first transmission time.

[0029] In some embodiments, the switching period is configured based on the frequency band switching capability information reported by the terminal.

[0030] In some embodiments, the frequency band switching capability information includes the shortest switching period supported by the terminal, and the switching period is greater than the shortest switching period.

[0031] In some embodiments, the terminal receives handover initial state information sent by the base station. The handover initial state information is used to indicate the terminal's operating status in the first frequency band and the second frequency band at the handover start reference time.

[0032] According to some embodiments of this disclosure, a frequency band switching device on the base station side is provided, comprising: a configuration unit, configured to configure periodic switching configuration information of a terminal in a first frequency band and a second frequency band according to at least one of the transmission period of channel state information or the transmission period of a synchronization signal block; and a transmission unit, configured to transmit the periodic switching configuration information to the terminal so that the terminal can periodically switch between the first frequency band and the second frequency band according to the periodic switching configuration information.

[0033] In some embodiments, the configuration unit configures periodic switching configuration information for uplink transmission in the first frequency band and downlink transmission in the second frequency band based on at least one of the transmission period of uplink channel state information or the transmission period of downlink synchronization signal block.

[0034] In some embodiments, the periodic switching configuration information ensures that the downlink transmission cycle of the terminal includes at least one complete channel state information reference signal and / or at least one complete synchronization signal block.

[0035] In some embodiments, when the channel state information is periodically transmitted and the synchronization signal block is also periodically transmitted, the configuration unit configures periodic switching configuration information according to the transmission period of the reference signal of the channel state information and the transmission period of the synchronization signal block.

[0036] In some embodiments, the periodic switching configuration information includes a switching period, and the configuration unit configures the switching period based on an integer multiple of the maximum value of the transmission period of the reference signal of the channel state information and the transmission period of the synchronization signal block.

[0037] In some embodiments, the periodic switching configuration information includes a switching period. When the channel state information is transmitted non-periodically and the synchronization signal block is transmitted periodically, the configuration unit configures the switching period according to the transmission period of the synchronization signal block; or when the channel state information is transmitted periodically and the state of the synchronization signal block is default, the configuration unit configures the switching period according to the transmission period of the reference signal of the channel state information.

[0038] In some embodiments, the configuration unit configures the switching period based on an integer multiple of the transmission period of the synchronization signal block, or based on an integer multiple of the transmission period of the reference signal of the channel state information.

[0039] In some embodiments, the periodic switching configuration information includes a switching start reference time. The configuration unit configures the switching start reference time based on the first transmission time of the reference signal of the channel state information and the second transmission time of the synchronization signal block. The second transmission time is the next transmission time adjacent to the first transmission time.

[0040] In some embodiments, when the transmission period of the synchronization signal block is greater than or equal to the transmission period of the reference signal for the channel state information, the configuration unit determines the switching start reference time based on the second transmission time; when the transmission period of the synchronization signal block is less than the transmission period of the reference signal for the channel state information, the configuration unit determines the switching start reference time based on the first transmission time.

[0041] In some embodiments, the periodic switching configuration information includes a switching start reference time, and the configuration unit performs at least one of the following: when the channel state information is periodically transmitted and the state of the synchronization signal block is default, the switching start reference time is configured according to the first transmission time of the reference signal of the channel state information; or when the channel state information is non-periodic transmitted and the synchronization signal block is periodically transmitted, the switching start reference time is configured according to the second transmission time of the synchronization signal block, wherein the second transmission time is the next transmission time adjacent to the first transmission time.

[0042] In some embodiments, the periodic switching configuration information includes a switching period, and the configuration unit configures the switching period based on the frequency band switching capability information reported by the terminal.

[0043] In some embodiments, the frequency band switching capability information includes the shortest switching period supported by the terminal, and the switching period is greater than the shortest switching period.

[0044] In some embodiments, the transmitting unit sends handover initial status information to the terminal, which is used to indicate the terminal's operating status in the first and second frequency bands at the handover start reference time.

[0045] According to some embodiments of the present disclosure, a frequency band switching device on the terminal side is provided, comprising: a receiving unit, configured to receive periodic switching configuration information of the terminal in a first frequency band and a second frequency band sent by a base station, the periodic switching configuration information being configured according to at least one of the transmission period of channel state information or the transmission period of synchronization signal block; and a switching unit, configured to perform periodic switching between the first frequency band and the second frequency band according to the periodic switching configuration information.

[0046] In some embodiments, the periodic switching configuration information is configured according to at least one of the transmission period of uplink channel state information or the transmission period of downlink synchronization signal block, and the periodic switching configuration information is the periodic switching configuration information of the terminal for uplink transmission in the first frequency band and downlink transmission in the second frequency band.

[0047] In some embodiments, the periodic switching configuration information ensures that the downlink transmission cycle of the terminal includes at least one complete channel state information reference signal and / or at least one complete synchronization signal block.

[0048] In some embodiments, when the channel state information is periodically transmitted and the synchronization signal block is also periodically transmitted, the periodic switching configuration information is configured according to the transmission period of the reference signal of the channel state information and the transmission period of the synchronization signal block.

[0049] In some embodiments, the periodic switching configuration information includes a switching period, which is configured as an integer multiple of the maximum value of the transmission period of the reference signal of the channel state information and the transmission period of the synchronization signal block.

[0050] In some embodiments, the periodic switching configuration information includes a switching period. When the channel state information is transmitted aperiodically and the synchronization signal block is transmitted periodically, the switching period is configured according to the transmission period of the synchronization signal block; and / or when the channel state information is transmitted periodically and the state of the synchronization signal block is default, the switching period is configured according to the transmission period of the reference signal of the channel state information.

[0051] In some embodiments, the switching period is configured as an integer multiple of the transmission period of the synchronization signal block; and / or the switching period is configured as an integer multiple of the transmission period of the reference signal for the channel state information.

[0052] In some embodiments, the periodic switching configuration information includes a switching start reference time, which is configured based on the first transmission time of the reference signal of the channel state information and the second transmission time of the synchronization signal block, wherein the second transmission time is the next transmission time adjacent to the first transmission time.

[0053] In some embodiments, when the transmission period of the synchronization signal block is greater than or equal to the transmission period of the reference signal for the channel state information, the switching start reference time is determined according to the second transmission time; when the transmission period of the synchronization signal block is less than the transmission period of the reference signal for the channel state information, the switching start reference time is determined according to the first transmission time.

[0054] In some embodiments, the periodic switching configuration information includes a switching start reference time. When the channel state information is periodically transmitted and the state of the synchronization signal block is default, the switching start reference time is configured according to the first transmission time of the reference signal of the channel state information; and / or when the channel state information is non-periodic transmitted and the synchronization signal block is periodically transmitted, the switching start reference time is configured according to the second transmission time of the synchronization signal block, wherein the second transmission time is the next transmission time adjacent to the first transmission time.

[0055] In some embodiments, the switching period is configured based on the frequency band switching capability information reported by the terminal.

[0056] In some embodiments, the frequency band switching capability information includes the shortest switching period supported by the terminal, and the switching period is greater than the shortest switching period.

[0057] In some embodiments, the receiving unit receives handover initial state information sent by the base station. The handover initial state information is used to indicate the operating state of the terminal in the first frequency band and the second frequency band at the handover start reference time.

[0058] According to further embodiments of this disclosure, a frequency band switching system is provided, comprising: a base station, configured to execute the frequency band switching method on the base station side of any of the above embodiments; and a terminal, configured to execute the frequency band switching method on the terminal side of any of the above embodiments.

[0059] According to further embodiments of the present disclosure, a frequency band switching device is provided, including: a memory; and a processor coupled to the memory, the processor being configured to execute a frequency band switching method on the base station side or a frequency band switching method on the terminal side of any of the above embodiments based on instructions stored in the memory device.

[0060] According to further embodiments of the present disclosure, a computer-readable storage medium is provided having a computer program stored thereon, which, when executed by a processor, implements the frequency band switching method on the base station side or the frequency band switching method on the terminal side in any of the above embodiments.

[0061] In the above embodiments, the terminal is configured to periodically switch between the first and second frequency bands based on at least one of the transmission period of channel state information or the transmission period of synchronization signal blocks. This enables non-simultaneous transmission and reception configuration of base station carrier aggregation, avoiding interference between different frequency bands and thus improving communication performance. Attached Figure Description

[0062] The accompanying drawings, which form part of this specification, illustrate embodiments of this disclosure and, together with the specification, serve to explain the principles of this disclosure.

[0063] This disclosure will become clearer with reference to the accompanying drawings and the following detailed description:

[0064] Figure 1 Flowcharts illustrating some embodiments of the frequency band switching method of this disclosure;

[0065] Figure 2 Flowcharts illustrating other embodiments of the frequency band switching method of this disclosure are shown;

[0066] Figure 3 Block diagrams illustrating some embodiments of the frequency band switching apparatus of this disclosure;

[0067] Figure 4 Block diagrams illustrating other embodiments of the frequency band switching apparatus of this disclosure;

[0068] Figure 5 Block diagrams illustrating further embodiments of the frequency band switching apparatus of this disclosure;

[0069] Figure 6 Block diagrams illustrating further embodiments of the frequency band switching apparatus of this disclosure;

[0070] Figure 7 Block diagrams illustrating some embodiments of the frequency band switching system of this disclosure are shown. Detailed Implementation

[0071] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present disclosure.

[0072] At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn according to actual scale.

[0073] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this disclosure or its application or use.

[0074] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0075] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0076] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0077] As mentioned earlier, the frequency aggregation technology in the spectrum pooling concept has been approved by 3GPP (3rd Generation Partnership Project). However, the aggregation of multiple frequency bands (such as 800MHz and 900MHz) can lead to interference problems. The interference is caused by two main factors: firstly, the frequency bands are too close together, resulting in insufficient antenna isolation; secondly, there is partial overlap between the downlink of the first frequency band (e.g., 800MHz) and the uplink of the second frequency band (e.g., 900MHz).

[0078] To address the aforementioned technical issues, this disclosure proposes a non-simultaneous transmission and reception configuration scheme for base station carrier aggregation. The configuration terminal achieves non-simultaneous transmission and reception through carrier switching to avoid interference.

[0079] The NR (New Radio) standard does not yet support the aggregation of overlapping frequency bands, especially low-frequency bands (below 1 GHz). This is mainly due to interference issues between frequency bands. The main methods for solving these interference problems can include the following.

[0080] For example, from an antenna perspective, one could increase the number of antennas, using different antennas for transmission and reception of different frequency bands to achieve a certain degree of spatial isolation. However, due to the large size of low-frequency antennas, adding another low-frequency antenna to the terminal side is very difficult.

[0081] For example, from a frequency allocation perspective, the aggregated frequencies can be redefined into new, non-overlapping frequency bands or bands with a certain spacing, and custom filters matched to these new bands can be used. While this can achieve better isolation to solve interference problems, the definition of new frequency bands and the customization of filters are limited by the development of the industry chain, affecting the deployment process of operators' network solutions.

[0082] For example, from the perspective of terminal transmit power, an additional maximum transmit power backoff can be adopted, which means reducing the terminal transmit power. This works well for non-overlapping frequency bands and can meet the adjacent channel radiation requirements. However, for overlapping frequency bands, considering the blocking effect on the receiver, the required backoff power is very large, making it impractical for deployment.

[0083] To address the aforementioned technical issues, this disclosure proposes a technical solution and corresponding configuration information for a base station to configure the terminal to periodically switch between uplink in the first frequency band and downlink in the second frequency band based on the capability information reported by the terminal and the current service volume requirements. This avoids interference issues caused by frequency overlap between uplink in the first frequency band and downlink in the second frequency band.

[0084] In some embodiments, this disclosure may employ a periodic switching between uplink transmission in a first frequency band and downlink transmission in a second frequency band; this disclosure may utilize time slots outside of the downlink SSB or downlink CSI-RS transmission in the second frequency band to transmit uplink data in the first frequency band. The switching period may be determined by at least one of the SSB transmission period or the CSI-RS occurrence period.

[0085] In some embodiments, the technical solution of this disclosure is mainly based on a carrier non-concurrent scheme, and the corresponding signaling flow is designed. For example, the technical solution of this disclosure can be implemented through the following embodiments.

[0086] Figure 1 Flowcharts illustrating some embodiments of the frequency band switching method of this disclosure are shown.

[0087] like Figure 1 As shown, in step 110, the periodic handover configuration information of the terminal in the first frequency band and the second frequency band is configured according to at least one of the CSI transmission period or the SSB transmission period. For example, the periodic handover configuration information may include at least one of the handover period, handover start reference time, or handover initial state information.

[0088] In some embodiments, the periodic switching configuration information of the terminal's uplink transmission in the first frequency band and downlink transmission in the second frequency band is configured according to at least one of the transmission period of uplink channel state information or the transmission period of downlink synchronization signal block.

[0089] For example, periodic switching configuration information ensures that the terminal's downlink transmission cycle includes at least one complete CSI-RS and / or at least one complete synchronization signal block.

[0090] In some embodiments, when the channel state information is periodically transmitted and the synchronization signal block is also periodically transmitted, periodic switching configuration information is configured according to the transmission period of the reference signal of the channel state information and the transmission period of the synchronization signal block.

[0091] In some embodiments, the periodic handover configuration information includes a handover period. The handover period is configured based on the frequency band handover capability information reported by the terminal. For example, the frequency band handover capability information includes the shortest handover period supported by the terminal, and the handover period is longer than the shortest handover period.

[0092] For example, the switching period can be configured based on an integer multiple of the maximum value of the transmission period of the reference signal for channel state information and the transmission period of the synchronization signal block.

[0093] For example, the current CSI-RS transmission period in the cell is C. CSI The SSB's transmission period is C. SSB The user-reported handover cycle capability (i.e., the shortest handover cycle supported by the terminal) is C. UE In the case of a downlink transmission cycle, to ensure the existence of at least one complete SSB and at least one complete CSI-RS, the switching cycle C can be calculated using the following formula:

[0094] C = k × max(C CSI C SSB C UE k = 1, 2, 3…

[0095] k is a positive integer and can be an adjustable multiplier parameter.

[0096] For example, when channel state information is transmitted aperiodically and synchronization signal blocks are transmitted periodically, the switching period is configured according to the transmission period of the synchronization signal blocks. For instance, the switching period is configured as an integer multiple of the transmission period of the synchronization signal blocks.

[0097] For example, if the current CSI-RS in the cell is aperiodic, the SSB transmission period is C. SSB The user-reported handover cycle capability is C. UE In this case, to ensure that at least one complete SSB exists within the downlink transmission cycle, the switching period C can be calculated using the following formula:

[0098] C = k × C SSB >C UE k = 1, 2, 3...

[0099] For example, when the channel state information is transmitted periodically and the synchronization signal block state is default, the switching period is configured based on the transmission period of the reference signal for the channel state information. Alternatively, the switching period can be configured as an integer multiple of the transmission period of the reference signal for the channel state information.

[0100] For example, the current CSI-RS transmission period in the cell is C. CSI The default SSB setting is C for user-reported handover cycle capability. UE In this case, to ensure that at least one complete CSI-RS exists within the downlink transmission cycle, the switching period C can be calculated using the following formula:

[0101] C = k × C CSI >C UE k = 1, 2, 3...

[0102] In some embodiments, the base station configures a handover period based on current traffic demand. For example, current traffic demand may include the traffic volume to be transmitted in the first frequency band (such as uplink traffic) and the traffic volume to be transmitted in the second frequency band (such as downlink traffic).

[0103] For example, the switching cycle between the first and second frequency bands can be determined based on the ratio of the traffic volume that needs to be transmitted in the first frequency band to the traffic volume that needs to be transmitted in the second frequency band.

[0104] In some embodiments, the periodic switching configuration information includes a switching start reference time. When the channel state information is periodically transmitted and the synchronization signal block is also periodically transmitted, the switching start reference time is configured according to the first transmission time of the channel state information reference signal and the second transmission time of the synchronization signal block, wherein the second transmission time is the next transmission time adjacent to the first transmission time.

[0105] For example, the switching start reference time can be represented by the system frame number and subframe number.

[0106] For example, if the transmission period of the synchronization signal block is greater than or equal to the transmission period of the reference signal for the channel state information, the handover start reference time is determined based on the second transmission time; if the transmission period of the synchronization signal block is less than the transmission period of the reference signal for the channel state information, the handover start reference time is determined based on the first transmission time.

[0107] For example, the current CSI-RS transmission period in the cell is C. CSI A certain transmission time of CSI-RS is t CSI The SSB's transmission period is C. SSB , and t CSI The next transmission time of the adjacent SSB is t. SSB In the case of ensuring that at least one complete SSB and at least one complete CSI-RS exist within the downlink transmission cycle, the switching start reference time t can be calculated using the following formula:

[0108]

[0109] In some embodiments, when the channel state information is transmitted non-periodically and the synchronization signal block is transmitted periodically, the switching start reference time is configured according to the second transmission time of the synchronization signal block, wherein the second transmission time is the next transmission time adjacent to the first transmission time.

[0110] For example, if the current CSI-RS in the cell is aperiodic, the SSB transmission period is C. SSB The SSB transmits at a certain time t. SSB In this case, to ensure that at least one complete SSB exists within the downlink transmission cycle, the switching start reference time can be calculated using the following formula:

[0111] t = t SSB

[0112] In some embodiments, when the channel state information is periodically transmitted and the state of the synchronization signal block is default, the switching start reference time is configured according to the first transmission time of the reference signal of the channel state information.

[0113] For example, the current CSI-RS transmission period in the cell is C. CSI A certain transmission time of CSI-RS is t CSI With SSB set to default, to ensure at least one complete CSI-RS exists within the downlink transmission cycle, the switching start reference time can be calculated using the following formula:

[0114] t = t CSI

[0115] In step 120, periodic switching configuration information is sent to the terminal so that the terminal can periodically switch between the first frequency band and the second frequency band according to the periodic switching configuration information.

[0116] In some embodiments, handover initial status information is sent to the terminal. This handover initial status information indicates the terminal's operating status in the first and second frequency bands at the handover start reference time. For example, the operating status may include uplink transmission in the first frequency band or downlink transmission in the second frequency band.

[0117] In some embodiments, this disclosure proposes a base station carrier aggregation non-simultaneous transmission and reception configuration scheme. The base station can configure the terminal to periodically switch between uplink transmission in the first frequency band and downlink transmission in the second frequency band based on the capability information reported by the terminal (such as the shortest handover period supported by the terminal) and the current traffic demand.

[0118] For example, the periodic handover configuration information configured by the base station may include: the handover period of the first frequency band and the second frequency band, which may be determined by the uplink CSI period and / or the downlink SSB period; the handover start reference time of the first frequency band and the second frequency band, which may be determined by at least one of the uplink CSI period and the transmission time or the downlink SSB period and the transmission time, and the handover start reference time may be represented by the system frame number and the subframe number; and handover initial state information, which is used to indicate the operating state of each frequency band at the handover start reference time point, and the operating state may include uplink transmission in the first frequency band or downlink transmission in the second frequency band.

[0119] In some embodiments, the base station can configure periodic handover configuration information via RRC. For example, the periodic handover configuration information for uplink transmission in the first frequency band and downlink transmission in the second frequency band can be configured using the following embodiments.

[0120]

[0121]

[0122] For example, SwitchingTime represents the duration of the switching cycle, which can be in milliseconds (ms); SwitchingEpoch represents the switching start reference time. For example, if sfn = 0 for the first frame and subFrameNR = 0 for the first subframe of each frame, then sfn = 500 and subFrameNR = 1, which means the switching start reference time is the second subframe of the 501st frame, and the corresponding time is (501 × 10 + 2 × 1) ms; SwitchingEpochState represents the initial switching state information. For example, UL n8 indicates an initial state of uplink in the 900MHz band, and DL n5 indicates an initial state of downlink in the 800MHz band.

[0123] In the above embodiments, the technical solution for periodic carrier switching by the base station includes configuring periodic switching information such as the switching period and the switching start reference time. This solves the co-channel interference problem caused by uplink and downlink frequency overlap in overlapping frequency carrier aggregation, thereby improving communication performance.

[0124] Figure 2 Flowcharts illustrating some other embodiments of the frequency band switching method of this disclosure are shown.

[0125] like Figure 2 As shown, in step 210, the terminal receives periodic switching configuration information for the first and second frequency bands from the base station. The periodic switching configuration information is configured according to at least one of the transmission period of channel state information or the transmission period of synchronization signal block.

[0126] In some embodiments, the periodic switching configuration information is configured according to at least one of the transmission period of uplink channel state information or the transmission period of downlink synchronization signal block, and the periodic switching configuration information is the periodic switching configuration information of the terminal for uplink transmission in the first frequency band and downlink transmission in the second frequency band.

[0127] In some embodiments, the periodic switching configuration information ensures that the downlink transmission cycle of the terminal includes at least one complete channel state information reference signal and / or at least one complete synchronization signal block.

[0128] In some embodiments, when the channel state information is periodically transmitted and the synchronization signal block is also periodically transmitted, the periodic switching configuration information is configured according to the transmission period of the reference signal of the channel state information and the transmission period of the synchronization signal block.

[0129] In some embodiments, the periodic switching configuration information includes a switching period, which is configured as an integer multiple of the maximum value of the transmission period of the reference signal of the channel state information and the transmission period of the synchronization signal block.

[0130] In some embodiments, the periodic switching configuration information includes a switching period. When the channel state information is transmitted aperiodically and the synchronization signal block is transmitted periodically, the switching period is configured according to the transmission period of the synchronization signal block; and / or when the channel state information is transmitted periodically and the state of the synchronization signal block is default, the switching period is configured according to the transmission period of the reference signal of the channel state information.

[0131] In some embodiments, the switching period is configured as an integer multiple of the transmission period of the synchronization signal block; and / or the switching period is configured as an integer multiple of the transmission period of the reference signal for the channel state information.

[0132] In some embodiments, the periodic switching configuration information includes a switching start reference time, which is configured based on the first transmission time of the reference signal of the channel state information and the second transmission time of the synchronization signal block, wherein the second transmission time is the next transmission time adjacent to the first transmission time.

[0133] In some embodiments, when the transmission period of the synchronization signal block is greater than or equal to the transmission period of the reference signal for the channel state information, the switching start reference time is determined according to the second transmission time; when the transmission period of the synchronization signal block is less than the transmission period of the reference signal for the channel state information, the switching start reference time is determined according to the first transmission time.

[0134] In some embodiments, the periodic switching configuration information includes a switching start reference time. When the channel state information is periodically transmitted and the state of the synchronization signal block is default, the switching start reference time is configured according to the first transmission time of the reference signal of the channel state information; and / or when the channel state information is non-periodic transmitted and the synchronization signal block is periodically transmitted, the switching start reference time is configured according to the second transmission time of the synchronization signal block, wherein the second transmission time is the next transmission time adjacent to the first transmission time.

[0135] In some embodiments, the switching period is configured based on the frequency band switching capability information reported by the terminal.

[0136] In some embodiments, the frequency band switching capability information includes the shortest switching period supported by the terminal, and the switching period is greater than the shortest switching period.

[0137] In step 220, periodic switching is performed between the first frequency band and the second frequency band according to the periodic switching configuration information.

[0138] In some embodiments, handover initial state information sent by a base station is received. This handover initial state information is used to indicate the terminal's operating state in the first and second frequency bands at the handover start reference time. For example, the operating state in the first and second frequency bands at the handover start reference time can be determined based on the received handover initial state information.

[0139] Figure 3 Block diagrams illustrating some embodiments of the frequency band switching apparatus of this disclosure are shown.

[0140] like Figure 3 As shown, the frequency band switching device 3 on the base station side includes: a configuration unit 31, configured to configure periodic switching configuration information of the terminal in the first frequency band and the second frequency band according to at least one of the transmission period of channel state information or the transmission period of synchronization signal block; and a transmission unit 32, configured to send periodic switching configuration information to the terminal so that the terminal can periodically switch between the first frequency band and the second frequency band according to the periodic switching configuration information.

[0141] In some embodiments, the configuration unit 31 configures periodic switching configuration information for uplink transmission in the first frequency band and downlink transmission in the second frequency band based on at least one of the transmission period of uplink channel state information or the transmission period of downlink synchronization signal block.

[0142] In some embodiments, the periodic switching configuration information ensures that the downlink transmission cycle of the terminal includes at least one complete channel state information reference signal and / or at least one complete synchronization signal block.

[0143] In some embodiments, when the channel state information is periodically transmitted and the synchronization signal block is also periodically transmitted, the configuration unit 31 configures periodic switching configuration information according to the transmission period of the reference signal of the channel state information and the transmission period of the synchronization signal block.

[0144] In some embodiments, the periodic switching configuration information includes a switching period. The configuration unit 31 configures the switching period based on an integer multiple of the maximum value of the transmission period of the reference signal of the channel state information and the transmission period of the synchronization signal block.

[0145] In some embodiments, the periodic switching configuration information includes a switching period. When the channel state information is transmitted non-periodically and the synchronization signal block is transmitted periodically, the configuration unit 31 configures the switching period according to the transmission period of the synchronization signal block; or when the channel state information is transmitted periodically and the state of the synchronization signal block is default, the configuration unit 31 configures the switching period according to the transmission period of the reference signal of the channel state information.

[0146] In some embodiments, the configuration unit 31 configures the switching period according to an integer multiple of the transmission period of the synchronization signal block, or according to an integer multiple of the transmission period of the reference signal of the channel state information.

[0147] In some embodiments, the periodic switching configuration information includes a switching start reference time. The configuration unit 31 configures the switching start reference time according to the first transmission time of the reference signal of the channel state information and the second transmission time of the synchronization signal block. The second transmission time is the next transmission time adjacent to the first transmission time.

[0148] In some embodiments, when the transmission period of the synchronization signal block is greater than or equal to the transmission period of the reference signal of the channel state information, the configuration unit 31 determines the switching start reference time based on the second transmission time; when the transmission period of the synchronization signal block is less than the transmission period of the reference signal of the channel state information, the configuration unit 31 determines the switching start reference time based on the first transmission time.

[0149] In some embodiments, the periodic switching configuration information includes a switching start reference time, and the configuration unit 31 performs at least one of the following: when the channel state information is periodically transmitted and the state of the synchronization signal block is default, the switching start reference time is configured according to the first transmission time of the reference signal of the channel state information; or when the channel state information is non-periodic transmitted and the synchronization signal block is periodically transmitted, the switching start reference time is configured according to the second transmission time of the synchronization signal block, wherein the second transmission time is the next transmission time adjacent to the first transmission time.

[0150] In some embodiments, the periodic switching configuration information includes a switching period, and the configuration unit 31 configures the switching period according to the frequency band switching capability information reported by the terminal.

[0151] In some embodiments, the frequency band switching capability information includes the shortest switching period supported by the terminal, and the switching period is greater than the shortest switching period.

[0152] In some embodiments, the sending unit 32 sends handover initial status information to the terminal. The handover initial status information is used to indicate the terminal's operating status in the first frequency band and the second frequency band at the handover start reference time point.

[0153] Figure 4 Block diagrams illustrating other embodiments of the frequency band switching apparatus of this disclosure are shown.

[0154] like Figure 4As shown, the frequency band switching device 4 on the terminal side includes: a receiving unit 41, used to receive periodic switching configuration information of the terminal in the first frequency band and the second frequency band sent by the base station, wherein the periodic switching configuration information is configured according to at least one of the transmission period of channel state information or the transmission period of synchronization signal block; and a switching unit 42, used to perform periodic switching between the first frequency band and the second frequency band according to the periodic switching configuration information.

[0155] In some embodiments, the periodic switching configuration information is configured according to at least one of the transmission period of uplink channel state information or the transmission period of downlink synchronization signal block, and the periodic switching configuration information is the periodic switching configuration information of the terminal for uplink transmission in the first frequency band and downlink transmission in the second frequency band.

[0156] In some embodiments, the periodic switching configuration information ensures that the downlink transmission cycle of the terminal includes at least one complete channel state information reference signal and / or at least one complete synchronization signal block.

[0157] In some embodiments, when the channel state information is transmitted periodically and the synchronization signal block is also transmitted periodically, the periodic switching configuration information is configured according to the transmission period of the reference signal of the channel state information and the transmission period of the synchronization signal block.

[0158] In some embodiments, the periodic switching configuration information includes a switching period, which is configured as an integer multiple of the maximum value of the transmission period of the reference signal of the channel state information and the transmission period of the synchronization signal block.

[0159] In some embodiments, the periodic switching configuration information includes a switching period. When the channel state information is transmitted aperiodically and the synchronization signal block is transmitted periodically, the switching period is configured according to the transmission period of the synchronization signal block; and / or when the channel state information is transmitted periodically and the state of the synchronization signal block is default, the switching period is configured according to the transmission period of the reference signal of the channel state information.

[0160] In some embodiments, the switching period is configured as an integer multiple of the transmission period of the synchronization signal block; and / or the switching period is configured as an integer multiple of the transmission period of the reference signal for the channel state information.

[0161] In some embodiments, the periodic switching configuration information includes a switching start reference time, which is configured based on the first transmission time of the reference signal of the channel state information and the second transmission time of the synchronization signal block, wherein the second transmission time is the next transmission time adjacent to the first transmission time.

[0162] In some embodiments, when the transmission period of the synchronization signal block is greater than or equal to the transmission period of the reference signal for the channel state information, the switching start reference time is determined according to the second transmission time; when the transmission period of the synchronization signal block is less than the transmission period of the reference signal for the channel state information, the switching start reference time is determined according to the first transmission time.

[0163] In some embodiments, the periodic switching configuration information includes a switching start reference time. When the channel state information is periodically transmitted and the state of the synchronization signal block is default, the switching start reference time is configured according to the first transmission time of the reference signal of the channel state information; and / or when the channel state information is non-periodic transmitted and the synchronization signal block is periodically transmitted, the switching start reference time is configured according to the second transmission time of the synchronization signal block, wherein the second transmission time is the next transmission time adjacent to the first transmission time.

[0164] In some embodiments, the switching period is configured based on the frequency band switching capability information reported by the terminal.

[0165] In some embodiments, the frequency band switching capability information includes the shortest switching period supported by the terminal, and the switching period is greater than the shortest switching period.

[0166] In some embodiments, the receiving unit 41 receives handover initial state information sent by the base station. The handover initial state information is used to indicate the operating status of the terminal in the first frequency band and the second frequency band at the handover start reference time.

[0167] Figure 5 Block diagrams illustrating further embodiments of the frequency band switching apparatus of this disclosure are shown.

[0168] like Figure 5 As shown, the frequency band switching device 5 of this embodiment includes: a memory 51 and a processor 52 coupled to the memory 51. The processor 52 is configured to execute the frequency band switching method on the base station side or the frequency band switching method on the terminal side in any embodiment of this disclosure based on the instructions stored in the memory 51.

[0169] The memory 51 may include, for example, system memory, fixed non-volatile storage media, etc. The system memory stores, for example, the operating system, application programs, a boot loader, a database, and other programs.

[0170] Figure 6 Block diagrams illustrating further embodiments of the frequency band switching apparatus of this disclosure are shown.

[0171] like Figure 6As shown, the frequency band switching device 6 of this embodiment includes: a memory 610 and a processor 620 coupled to the memory 610. The processor 620 is configured to execute the frequency band switching method on the base station side or the frequency band switching method on the terminal side in any of the foregoing embodiments based on the instructions stored in the memory 610.

[0172] The memory 610 may include, for example, system memory, fixed non-volatile storage media, etc. The system memory may store, for example, the operating system, application programs, a boot loader, and other programs.

[0173] The frequency band switching device 6 may also include an input / output interface 630, a network interface 640, and a storage interface 650. These interfaces 630, 640, and 650, as well as the memory 610 and processor 620, can be connected via, for example, a bus 660. The input / output interface 630 provides a connection interface for input / output devices such as a monitor, mouse, keyboard, touchscreen, microphone, and speakers. The network interface 640 provides a connection interface for various networked devices. The storage interface 650 provides a connection interface for external storage devices such as SD cards and USB flash drives.

[0174] Figure 7 Block diagrams illustrating some embodiments of the frequency band switching system of this disclosure are shown.

[0175] like Figure 7 As shown, the frequency band switching system 7 includes: a base station 71, used to execute the frequency band switching method on the base station side in any of the above embodiments; and a terminal 72, used to execute the frequency band switching method on the terminal side in any of the above embodiments.

[0176] Those skilled in the art will understand that embodiments of this disclosure can be provided as methods, systems, or computer program products. Therefore, this disclosure can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this disclosure can take the form of a computer program product embodied on one or more computer-usable non-transitory storage media containing computer-usable program code, including but not limited to disk storage, CD-ROM, optical storage, etc.

[0177] The frequency band switching method, frequency band switching apparatus, frequency band switching system, and computer-readable storage medium according to this disclosure have been described in detail. To avoid obscuring the concept of this disclosure, some details known in the art have not been described. Those skilled in the art will fully understand how to implement the technical solutions disclosed herein based on the above description.

[0178] The methods and systems of this disclosure may be implemented in many ways. For example, they may be implemented by software, hardware, firmware, or any combination of software, hardware, and firmware. The above-described order of steps for the methods is for illustrative purposes only, and the steps of the methods of this disclosure are not limited to the order specifically described above unless otherwise specifically stated. Furthermore, in some embodiments, this disclosure may also be implemented as a program recorded on a recording medium, the program including machine-readable instructions for implementing the methods according to this disclosure. Thus, this disclosure also covers recording media storing programs for performing the methods according to this disclosure.

[0179] While specific embodiments of this disclosure have been described in detail by way of example, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of this disclosure. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of this disclosure. The scope of this disclosure is defined by the appended claims.

Claims

1. A frequency band switching method, comprising: configuring, according to at least one of a transmission period of channel state information or a transmission period of a synchronization signal block, a terminal with periodic switching configuration information of a first frequency band and a second frequency band; transmitting the periodic switching configuration information to the terminal, so that the terminal performs periodic switching between the first frequency band and the second frequency band according to the periodic switching configuration information, wherein the configuring the terminal with the periodic switching configuration information of the first frequency band and the second frequency band comprises: configuring, according to at least one of a transmission period of the channel state information in uplink or a transmission period of the synchronization signal block in downlink, the terminal with the periodic switching configuration information of uplink transmission in the first frequency band and downlink transmission in the second frequency band, the periodic switching configuration information comprising a switching period.

2. The frequency band switching method of claim 1, wherein, The periodic switching configuration information ensures that a downlink transmission period of the terminal includes at least one complete reference signal of channel state information and / or at least one complete synchronization signal block.

3. The frequency band switching method of claim 1, wherein, The configuring the terminal with the periodic switching configuration information of uplink transmission in the first frequency band and downlink transmission in the second frequency band comprises: in a case where the channel state information is periodically transmitted and the synchronization signal block is also periodically transmitted, configuring the periodic switching configuration information according to a transmission period of a reference signal of the channel state information and a transmission period of the synchronization signal block.

4. The frequency band switching method of claim 3, wherein, The configuring the periodic switching configuration information according to the transmission period of the reference signal of the channel state information and the transmission period of the synchronization signal block comprises: configuring the switching period according to an integer multiple of a maximum value of the transmission period of the reference signal of the channel state information and the transmission period of the synchronization signal block.

5. The frequency band switching method of claim 1, wherein, The periodic switching configuration information comprises a switching period, The configuring the terminal with the periodic switching configuration information of uplink transmission in the first frequency band and downlink transmission in the second frequency band comprises at least one of: in a case where the channel state information is non-periodically transmitted and the synchronization signal block is periodically transmitted, configuring the switching period according to a transmission period of the synchronization signal block; or in a case where the channel state information is periodically transmitted and a state of the synchronization signal block is default, configuring the switching period according to a transmission period of a reference signal of the channel state information.

6. The frequency band switching method of claim 5, wherein, The configuring the switching period according to the transmission period of the synchronization signal block comprises: configuring the switching period according to an integer multiple of the transmission period of the synchronization signal block; The configuring the switching period according to the transmission period of the reference signal of the channel state information comprises: configuring the switching period according to an integer multiple of the transmission period of the reference signal of the channel state information.

7. The frequency band switching method of claim 3, wherein, The periodic switching configuration information comprises a switching start reference time, The configuring the periodic switching configuration information according to the transmission period of the reference signal of the channel state information and the transmission period of the synchronization signal block comprises: The switching start reference time is configured according to a first sending time of the channel state information reference signal and a second sending time of the synchronization signal block, the second sending time being a next sending time adjacent to the first sending time.

8. The frequency band switching method of claim 7, wherein, The configuring the switching start reference time according to the first sending time of the channel state information reference signal and the second sending time of the synchronization signal block comprises: In a case where a sending period of the synchronization signal block is greater than or equal to a sending period of the channel state information reference signal, the switching start reference time is determined according to the second sending time; In a case where the sending period of the synchronization signal block is less than the sending period of the channel state information reference signal, the switching start reference time is determined according to the first sending time.

9. The frequency band switching method of claim 1, wherein, The periodic switching configuration information comprises a switching start reference time, The configuring the terminal to perform the periodic switching between the first frequency band and the second frequency band according to the periodic switching configuration information comprises at least one of the following: In a case where the channel state information is periodically sent and a state of the synchronization signal block is default, the switching start reference time is configured according to a first sending time of the channel state information reference signal; Or In a case where the channel state information is non-periodically sent and the synchronization signal block is periodically sent, the switching start reference time is configured according to a second sending time of the synchronization signal block, the second sending time being a next sending time adjacent to the first sending time.

10. The frequency band switching method according to any one of claims 1-9, further comprising: sending switching initial state information to the terminal, the switching initial state information being used to instruct the terminal to work in a state on the first frequency band and the second frequency band at a switching start reference time point.

11. A frequency band switching method, comprising: receiving periodic switching configuration information of a terminal on a first frequency band and a second frequency band sent by a base station, the periodic switching configuration information being configured according to at least one of a sending period of channel state information or a sending period of a synchronization signal block, the periodic switching configuration information being configured according to at least one of an uplink sending period of the channel state information or a downlink sending period of the synchronization signal block, the periodic switching configuration information being periodic switching configuration information of the terminal for uplink transmission on the first frequency band and downlink transmission on the second frequency band, the periodic switching configuration information comprising a switching period; performing periodic switching between the first frequency band and the second frequency band according to the periodic switching configuration information.

12. A frequency band switching apparatus, comprising: a configuration unit configured to configure periodic switching configuration information of a terminal on a first frequency band and a second frequency band according to at least one of a sending period of channel state information or a sending period of a synchronization signal block; a sending unit configured to send the periodic switching configuration information to the terminal, so that the terminal performs periodic switching between the first frequency band and the second frequency band according to the periodic switching configuration information. The configuration unit configures the periodic switching configuration information of the terminal between uplink transmission in the first frequency band and downlink transmission in the second frequency band according to at least one of a transmission period of the channel state information of the uplink or a transmission period of the synchronization signal block of the downlink, and the periodic switching configuration information comprises a switching period.

13. A frequency band switching apparatus, comprising: a receiving unit configured to receive, from a base station, periodic switching configuration information of a terminal between a first frequency band and a second frequency band, the periodic switching configuration information being configured according to at least one of a transmission period of channel state information or a transmission period of a synchronization signal block, the periodic switching configuration information being configured according to at least one of a transmission period of the channel state information of the uplink or a transmission period of the synchronization signal block of the downlink, the periodic switching configuration information being periodic switching configuration information of the terminal between uplink transmission in the first frequency band and downlink transmission in the second frequency band, and the periodic switching configuration information comprising a switching period; a switching unit configured to perform periodic switching between the first frequency band and the second frequency band according to the periodic switching configuration information.

14. A frequency band switching system, comprising: a base station configured to perform the frequency band switching method of any one of claims 1-10; and a terminal configured to perform the frequency band switching method of claim 11.

15. A frequency band switching apparatus, comprising: a memory; and a processor coupled to the memory, the processor being configured to execute the frequency band switching method of any one of claims 1-10 or the frequency band switching method of claim 11 based on instructions stored in the memory.

16. A computer readable storage medium having stored thereon a computer program, the program being executed by a processor to implement the frequency band switching method of any one of claims 1-10 or the frequency band switching method of claim 11.

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