CN110621058B

CN110621058B - Communication method and device

Info

Publication number: CN110621058B
Application number: CN201810637732.XA
Authority: CN
Inventors: 李俊超; 唐浩; 唐臻飞
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2018-06-20
Filing date: 2018-06-20
Publication date: 2022-04-05
Anticipated expiration: 2038-06-20
Also published as: CN110621058A; WO2019242570A1

Abstract

The application provides a communication method and a device, and the method comprises the following steps: the terminal determines the activated first bandwidth part; switching the terminal from the first bandwidth portion to a first default bandwidth portion; wherein the first default bandwidth portion is a downstream bandwidth portion of a first bandwidth portion group, the activated first bandwidth portion belongs to a second bandwidth portion group, and the first bandwidth portion group is used for receiving system messages and/or for initial access. The communication method and the communication device can realize the backspacing of a plurality of bandwidth parts, and are beneficial to saving the energy consumption of terminal equipment.

Description

Communication method and device

Technical Field

The present application relates to the field of communications, and more particularly, to a communication method and apparatus.

Background

In the New Radio (NR) of the 5th generation (5G), data transmission between the network device and the terminal is discussed and supported through a two-step resource allocation manner, that is, the network device may first indicate a frequency domain continuous resource, called a carrier bandwidth part (BWP), to the terminal, and then allocate the resource and transmit data to the terminal in the BWP.

Generally, a network device may configure an active bandwidth part for a terminal first, but if the network device does not schedule the terminal for a long time, the bandwidth part of the terminal may be always in an active state, which wastes terminal energy consumption. Therefore, how to implement the energy saving of the terminal under the above scenario has become a technical problem to be solved urgently.

Disclosure of Invention

The application provides a communication method and device, which can realize the rollback of a bandwidth part and is beneficial to saving the energy consumption of terminal equipment.

In a first aspect, a communication method is provided, including: the terminal determines the activated first bandwidth part; switching the terminal from the first bandwidth portion to a first default bandwidth portion; wherein the first default bandwidth portion is a downstream bandwidth portion of a first group of bandwidth portions.

Specifically, the terminal may determine a first bandwidth part that has been activated according to the configuration of the network device, and then switch from the first bandwidth part to a first default bandwidth part, thereby implementing the fallback of the bandwidth part. The first default bandwidth portion is a downstream bandwidth portion and belongs to a first bandwidth portion group.

It should be understood that the switching of the bandwidth part may also be referred to as a fallback of the bandwidth part, specifically, deactivating the activated bandwidth part and activating a default bandwidth part. Therefore, in the embodiment of the present application, at least one of the activated first bandwidth parts is different from the first default bandwidth part, and the two bandwidth parts are different from each other, which means that at least one of the frequency location, the bandwidth and the parameter set of the two bandwidth parts is different.

According to the communication method, the activated bandwidth part is switched to the default bandwidth part, so that the rollback of the bandwidth part is realized, the terminal energy consumption is saved, and the system performance is improved.

With reference to the first aspect, in one possible implementation manner, the first bandwidth part belongs to a second bandwidth part group.

On the basis of the grouping of the bandwidth part, the switching of the bandwidth part can be divided into two cases, namely, a cross-group switching and a present-group switching, which is not limited in the embodiment of the present application. For the group switching, the first bandwidth part may belong to the above-described first bandwidth part group. For cross-group switching, the first bandwidth part may belong to a second bandwidth part group, in which case the terminal is actually switched from a bandwidth part in the second bandwidth part group to one bandwidth part in the first bandwidth part group.

Alternatively, the default bandwidth part may be configured only in the main bandwidth part packet, or may be configured in a plurality of bandwidth part packets, which is not limited in this embodiment of the present application. The first default bandwidth part packet mentioned above refers to only the default bandwidth part in the main bandwidth part packet. In one possible implementation, the network device may configure a default bandwidth portion for each bandwidth portion packet.

With reference to the first aspect, in one possible implementation manner, the first bandwidth part packet is used for receiving a system message and/or is used for initial access.

In other words, the downstream bandwidth portion of the first bandwidth portion packet may include a bandwidth portion for receiving system messages and/or a bandwidth portion for initial access, and thus the first bandwidth portion packet may also be referred to as a primary bandwidth portion packet. If the first bandwidth part belongs to a second bandwidth part group, the second bandwidth part group may also be referred to as a slave bandwidth part group. The terminal switches from the first bandwidth part to the first default bandwidth part, i.e. from the bandwidth part in the bandwidth part group to one bandwidth part in the main bandwidth part group.

With reference to the first aspect, in one possible implementation manner, the switching the terminal from the first bandwidth portion to a first default bandwidth portion includes: the terminal switches from the first bandwidth portion to the first default bandwidth portion when a first timer expires.

Specifically, the network device may configure a first timer for the terminal and indicate a duration of the first timer, the terminal starts the first timer on the activated first bandwidth portion, and if the first timer expires (or times out), the terminal has not received the downlink control signaling sent by the network device, and the terminal may perform the above switching operation, that is, switching from the first bandwidth portion to the first default bandwidth portion.

It should be understood that the network device also maintains the first timer, and if the terminal executes the rollback operation, the network device may learn according to the configured first timer, so as to ensure that the network device and the terminal understand consistently.

With reference to the first aspect, in a possible implementation manner, the second bandwidth part packet includes a second default bandwidth part; switching the terminal from the first bandwidth portion to a first default bandwidth portion, comprising: switching the terminal from the first bandwidth portion to the second default bandwidth portion; the terminal switches from the second default bandwidth portion to the first default bandwidth portion.

In the above configuration, the terminal device may implement two-stage fallback of activating the bandwidth part, that is, first switching from the activated first bandwidth part to the second default bandwidth part, and then switching from the second default bandwidth part to the first default bandwidth part. It should be understood that the number of the second default bandwidth part may be plural, and the number of the first default bandwidth part is one.

It should be understood that, in the embodiment of the present application, the second bandwidth part packet may include the first bandwidth part packet. In this case, the configurations of the first default bandwidth part and the second default bandwidth part in the first bandwidth part group may be independent; alternatively, a first default bandwidth portion in the first bandwidth portion group may be defaultable, and a second default bandwidth portion in the first bandwidth portion group may be defined as the first default bandwidth portion in the first bandwidth portion group, that is, the first default bandwidth portion and the second default bandwidth portion in the first bandwidth portion group are the same, but the embodiment of the present application does not limit this. In the embodiment of the present application, the second bandwidth part packet may not include the first bandwidth part packet. In this case, the first default bandwidth portion in the first bandwidth portion group may be defined as the second default bandwidth portion in the first bandwidth portion group, that is, the first default bandwidth portion and the second default bandwidth portion in the first bandwidth portion group are the same, but the embodiment of the present application does not limit this.

With reference to the first aspect, in one possible implementation manner, the switching the terminal from the first bandwidth portion to a first default bandwidth portion includes: when the duration of a second timer is greater than a first threshold value, the terminal switches from the first bandwidth part to the second default bandwidth part; and when the duration of the second timer is greater than a second threshold value, the terminal is switched from the second default bandwidth part to the first default bandwidth part.

It will be appreciated that the second threshold is greater than the first threshold.

Specifically, for a scenario of two-level fallback, the network device may configure one timer and two threshold values for the terminal, that is, the second timer, the first threshold value, and the second threshold value, where the first threshold value is less than or equal to the second threshold value, when the duration of the second timer exceeds the first threshold value, the terminal performs the first-level fallback, that is, switches from the first bandwidth part to the second default bandwidth part, and when the duration of the second timer exceeds the second threshold value, the terminal performs the second-level fallback, that is, switches from the second default bandwidth part to the first default bandwidth part.

With reference to the first aspect, in one possible implementation manner, the switching the terminal from the first bandwidth portion to the second default bandwidth portion includes: when a third timer expires, the terminal switches from the first bandwidth portion to the second default bandwidth portion; the terminal switching from the second default bandwidth part to the first default bandwidth part comprises: when a fourth timer expires, the terminal switches from the second default bandwidth portion to the first default bandwidth portion.

It should be understood that the duration of the fourth timer is greater than the duration of the third timer.

Specifically, for a scenario of two-level fallback, the network device may configure two timers and durations of the two timers for the terminal, that is, the third timer and the fourth timer, where the duration of the third timer is less than or equal to the duration of the fourth timer, when the third timer expires, the terminal performs a first-level fallback, that is, switches from the first bandwidth part to the second default bandwidth part, and when the fourth timer expires, the terminal performs a second-level fallback, that is, switches from the second default bandwidth part to the first default bandwidth part.

In a second aspect, another communication method is provided, including: a network device determining a plurality of bandwidth part packets, a first bandwidth part packet of the plurality of bandwidth part packets comprising a first default bandwidth part, the first bandwidth part packet being for receiving system messages and/or for initial access; the network device configures the first default bandwidth portion for a terminal.

In particular, the network device may determine a plurality of bandwidth part packets, a first bandwidth part packet of the plurality of bandwidth part packets comprising a first default bandwidth part, the first default bandwidth part being available for fallback by the terminal. Wherein the first bandwidth part packet is used for receiving a system message and/or for initial access. In other words, the first bandwidth part packet may include a bandwidth part for receiving a system message and a first default bandwidth part, may also include a bandwidth part for initial access and a first default bandwidth part, and may also include all of the above three, which is not limited in this embodiment of the present application. In the embodiments of the present application, the first bandwidth part group may also be referred to as a main bandwidth part group.

According to the communication method, the network device determines the plurality of bandwidth part groups, and configures the first default bandwidth part for the terminal based on the plurality of bandwidth part groups, so that the terminal can execute rollback of the plurality of bandwidth parts according to the configuration of the network device, namely, switch from the activated plurality of bandwidth parts to the first default bandwidth part, and therefore energy consumption of the terminal device is saved, and system performance is improved.

With reference to the second aspect, in a possible implementation manner, the method further includes: the network device selects a downstream bandwidth portion from the first bandwidth portion packet as the first default bandwidth portion.

Specifically, in the case where the first bandwidth part packet is an explicit configuration, the network device may determine the first bandwidth part packet, configure the first bandwidth part packet for the terminal, select a downlink bandwidth part from the first bandwidth part packet as the first default bandwidth part, that is, select a first default bandwidth part from the main bandwidth part packet, and signal the first default bandwidth part to the terminal.

With reference to the second aspect, in a possible implementation manner, the method further includes: the network equipment selects a downlink bandwidth part from the configured bandwidth parts as the first default bandwidth part; the network device determining a plurality of bandwidth part packets, comprising: the network device determines a bandwidth part packet to which the first default bandwidth part belongs as the first bandwidth part packet.

Specifically, in the case that the first bandwidth part packet is implicitly configured, the network device may first select a first default bandwidth part, the selectable set of which is at least one bandwidth part that is configured, and then, the network device may determine a bandwidth part packet in which the first default bandwidth part is located as the first bandwidth part packet, which is the primary bandwidth part packet. In this case, it may be specified by a protocol that the default bandwidth part is configured only in the primary bandwidth part packet, and the terminal may determine the first default bandwidth part according to the configuration of the network device, thereby determining the first bandwidth part packet to which the first default bandwidth part belongs as the primary bandwidth part packet.

With reference to the second aspect, in a possible implementation manner, the method further includes: the network device configures a second default bandwidth portion for the terminal, a second bandwidth portion packet of the plurality of bandwidth portion packets including the second default bandwidth portion.

Specifically, in the case that the network device configures the first default bandwidth part, the network device may further configure a second default bandwidth part, so that the terminal performs two-level fallback, i.e. fallback from the activated plurality of first bandwidth parts to the second default bandwidth part and then fallback from the second default bandwidth part to the first default bandwidth part. The selectable set of second default bandwidth portions are configured bandwidth portion groupings. In other words, the configured bandwidth part packet includes a bandwidth part packet 1 and a bandwidth part packet 2, and the network device needs to configure a second default bandwidth part for the bandwidth part packet 2, so that the network device can select a downstream bandwidth part from the bandwidth parts included in the bandwidth part packet 2 as the second default bandwidth part of the bandwidth part packet 2.

It should be understood that the number of the second default bandwidth part may be one or more, and the second default bandwidth part belongs to a second bandwidth part group in the plurality of bandwidth part groups. In one possible implementation, there are a second bandwidth part packets, B of the a second bandwidth part packets may include a second default bandwidth part, and each of the B second bandwidth part packets includes a second default bandwidth part, where B is less than or equal to a. For example, there are 5 second bandwidth part packets, wherein each of the 3 second bandwidth part packets has a respective one of the second default bandwidth parts. As another example, there are 5 second bandwidth part packets, each of the 5 second bandwidth part packets having a respective one of the second default bandwidth parts.

With reference to the second aspect, in a possible implementation manner, a second bandwidth part packet including the second default bandwidth part is used for receiving a system message and/or is used for initial access.

With reference to the second aspect, in one possible implementation manner, a second bandwidth part packet of the plurality of bandwidth part packets includes the activated first bandwidth part.

In a third aspect, there is provided an apparatus comprising means for performing the steps of any one of the first to second aspects and embodiments thereof.

In one design, the device is a communication chip that may include an input circuit or interface for sending information or data and an output circuit or interface for receiving information or data.

In another design, the apparatus is a terminal that may include a transmitter to transmit information or data and a receiver to receive information or data.

In yet another design, the apparatus is a network device that may include a transmitter to transmit information or data and a receiver to receive information or data.

In a fourth aspect, there is provided an apparatus comprising a processor, a memory for storing a computer program, and a processor for calling and running the computer program from the memory, so that the apparatus performs the method of any one of the first to second aspects and the embodiments thereof.

Optionally, the number of the processors is one or more, and the number of the memories is one or more.

Alternatively, the memory may be integral to the processor or provided separately from the processor.

Optionally, the communication device further comprises a transmitter (transmitter) and a receiver (receiver).

In a fifth aspect, there is provided a computer program product comprising: computer program (also called code, or instructions), which when executed, causes a computer to perform the method of any of the possible implementations of the first to second aspects described above.

A sixth aspect provides a computer-readable medium storing a computer program (which may also be referred to as code or instructions) which, when run on a computer, causes the computer to perform the method of any one of the possible implementations of the first to second aspects described above.

In a seventh aspect, a chip system is provided, which includes a memory for storing a computer program and a processor for calling and executing the computer program from the memory, so that a communication device in which the chip system is installed executes the method in any one of the possible implementation manners of the first aspect to the second aspect.

The system-on-chip may include, among other things, input circuitry or interfaces for transmitting information or data, and output circuitry or interfaces for receiving information or data.

Drawings

Fig. 1 is a schematic diagram of a communication system according to an embodiment of the present application.

Fig. 2 is an exemplary flowchart of a communication method according to an embodiment of the present application.

Fig. 3 is an exemplary flow chart of another communication method according to an embodiment of the present application.

Fig. 4 is an exemplary block diagram of an apparatus according to an embodiment of the present application.

Fig. 5 is an exemplary block diagram of another apparatus according to an embodiment of the present application.

Fig. 6 is a schematic structural diagram of a terminal according to an embodiment of the present application.

Fig. 7 is a schematic structural diagram of a network device according to an embodiment of the present application.

Detailed Description

The technical solution in the present application will be described below with reference to the accompanying drawings.

The technical scheme of the embodiment of the application can be applied to various communication systems, for example: a global system for mobile communication (GSM) system, a Code Division Multiple Access (CDMA) system, a Wideband Code Division Multiple Access (WCDMA) system, a General Packet Radio Service (GPRS), a long term evolution (long term evolution, LTE) system, a LTE Frequency Division Duplex (FDD) system, a LTE Time Division Duplex (TDD) system, a universal mobile telecommunications system (universal mobile telecommunications system, UMTS), a Worldwide Interoperability for Microwave Access (WiMAX) communication system, a fifth generation (5G) system, or a new radio network (UMTS) NR, etc.

A terminal in the embodiments of the present application may refer to a User Equipment (UE), a terminal device, an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a user terminal, a wireless communication device, a user agent, or a user equipment. The terminal may also be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with wireless communication function, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a terminal in a future 5G network or a terminal in a future evolved Public Land Mobile Network (PLMN), and the like, which is not limited in this embodiment.

The network device in this embodiment may be a device for communicating with a terminal, where the network device may be a Base Transceiver Station (BTS) in a global system for mobile communications (GSM) system or a Code Division Multiple Access (CDMA) system, may also be a base station (nodeB, NB) in a Wideband Code Division Multiple Access (WCDMA) system, may also be an evolved node b (eNB or eNodeB) in an LTE system, may also be a wireless controller in a Cloud Radio Access Network (CRAN) scenario, or may be a relay station, an access point, a vehicle-mounted device, a wearable device, a network device in a 5G network, or a network device in a future evolved PLMN network, and the like, and the present embodiment is not limited.

In the following, some concepts or terms referred to in the present application are first briefly described.

1. Bandwidth part (BWP)

In the 5G NR, data transmission between a network device and a terminal is discussed and supported by a two-step resource allocation manner, that is, the network device allocates a bandwidth portion to the terminal first, then allocates resources to the terminal in the bandwidth portion, and transmits data by allocating resources to the terminal. Hereinafter, unless otherwise specified, transmission may refer to either uplink transmission or downlink reception.

It should be understood that the bandwidth part may also be referred to as a carrier bandwidth part (carrier bandwidth part), and other names may also be used, which is not limited in the embodiments of the present application.

It should also be understood that the cell may be a serving cell for the terminal. The serving cell is described by a higher layer from the point of view of resource management or mobility management or serving element. The coverage area of each network device may be divided into one or more serving cells, and the serving cells may be regarded as being composed of certain frequency domain resources, i.e., one serving cell may include one or more carriers. The concept of carrier waves is described from the point of view of signal generation of the physical layer. One carrier is defined by one or more frequency points, corresponds to a continuous or discontinuous section of spectrum, and is used for carrying communication data between the network equipment and the terminal. The downlink carrier may be used for downlink transmission and the uplink carrier may be used for uplink transmission. In addition, a plurality of uplink bandwidth parts may be configured on one uplink carrier, and a plurality of downlink bandwidth parts may be configured on one downlink carrier.

Illustratively, the allocation of the bandwidth portion to the terminal by the network device may be applied to any one or any combination of the following three scenarios.

(1) Large bandwidth scenarios

In a communication system, with the increase of terminal traffic and the increase of the number of terminals, the system traffic is significantly increased, and therefore, a design that the system bandwidth is large bandwidth is proposed in the existing communication system to provide more system resources, so as to provide a higher data transmission rate. In a communication system in which the system bandwidth is large, the bandwidth supported by the terminal may be smaller than the system bandwidth in consideration of the cost of the terminal and the traffic of the terminal. The larger the bandwidth supported by the terminal is, the stronger the processing capability of the terminal is, the higher the data transmission rate of the terminal may be, and the higher the design cost of the terminal may be. The bandwidth supported by the terminal may also be referred to as the bandwidth capability of the terminal. Illustratively, in a 5G system, the system bandwidth may be 400MHz at most, and the bandwidth capability of the terminal may be 20MHz, 50MHz, or 100MHz, etc. In a wireless communication system, the bandwidth capabilities of different terminals may be the same or different, which is not limited in this embodiment of the present application.

In a communication system with a large system bandwidth, since the bandwidth capability of the terminal is smaller than the system bandwidth, the network device may configure a bandwidth portion for the terminal from the system frequency resources, where the bandwidth of the bandwidth portion is smaller than or equal to the bandwidth capability of the terminal. When the terminal and the network device communicate, the network device may allocate some or all of the resources in the bandwidth portion configured for the terminal to the terminal for communication between the network device and the terminal.

(2) Multi-parameter set (numerology) scenes

In a wireless communication system, for example, a 5G system, in order to support more service types and/or communication scenarios, a design supporting multiple parameter sets is proposed. The parameter set is a parameter employed by the communication system. A communication system (e.g., 5G) may support multiple parameter sets. The parameter set may be defined by one or more of the following parameter information: subcarrier spacing, Cyclic Prefix (CP), time unit, bandwidth, etc. The parameter sets may be set independently for different traffic types and/or communication scenarios.

In one possible configuration, the network device may configure multiple bandwidth portions in the system frequency resource, and independently configure a set of parameters for each of the multiple bandwidth portions, for supporting multiple traffic types and/or communication scenarios in the system frequency resource. The parameter sets of different bandwidth parts may be the same or different, and the present application is not limited thereto.

When the terminal and the network device communicate, the network device may determine the parameter set a for communicating based on the traffic type and/or the communication scenario corresponding to the communication, so that the terminal may be configured with a corresponding bandwidth portion based on the parameter set a. Wherein the parameter set of the corresponding bandwidth part is configured as parameter set a. When the terminal and the network device communicate with each other, the network device may allocate some or all of the resources in the bandwidth portion configured for the terminal to the terminal for communication between the network device and the terminal.

(3) Bandwidth fallback

When the terminal and the network device communicate, the network device may configure a bandwidth part for the terminal based on the traffic of the terminal, for saving power consumption of the terminal. For example, if the terminal has no service, the terminal may receive the control information only in a smaller bandwidth portion, which may reduce the task amount of the radio frequency processing and the task amount of the baseband processing of the terminal, and thus may reduce the power consumption of the terminal. If the traffic of the terminal is less, the network device may configure a bandwidth portion with a smaller bandwidth for the terminal, which may reduce the task amount of radio frequency processing and the task amount of baseband processing of the terminal, thereby reducing the power consumption of the terminal. If the traffic of the terminal is large, the network device may configure the terminal with a bandwidth portion having a larger bandwidth, so as to provide a higher data transmission rate. When the terminal and the network device communicate with each other, the network device may allocate some or all of the resources in the bandwidth portion configured for the terminal to the terminal for communication between the network device and the terminal.

Illustratively, the bandwidth part may be a downlink bandwidth part for downlink reception by the terminal, where the bandwidth of the bandwidth part does not exceed the reception bandwidth capability of the terminal; the bandwidth part may also be an uplink bandwidth part, which is used for uplink transmission by the terminal, and in this case, the bandwidth of the bandwidth part does not exceed the transmission bandwidth capability of the terminal.

The network device may configure the terminal with a plurality of bandwidth portions including both an upstream bandwidth portion and a downstream bandwidth portion. Generally, the upstream bandwidth part and the downstream bandwidth part are configured independently, including configuring their frequency location, bandwidth and parameter set independently.

At a given moment, the terminal performs data transmission based on the active bandwidth part in the configured bandwidth part. The terminal does not expect to perform downlink reception outside the downlink bandwidth portion and does not expect to perform uplink transmission outside the uplink bandwidth portion. This transmission feature may also be referred to as self-contained transmission. For example, at a given time, the terminal has an activated downlink bandwidth portion and an activated uplink bandwidth portion (if a supplementary uplink carrier (SUL) is configured in the cell, an uplink bandwidth portion may be additionally activated). For a Time Division Duplex (TDD) mode, the activated uplink bandwidth part and the downlink bandwidth part are aligned in the center (it is not required that the uplink bandwidth part on the SUL is aligned with the downlink bandwidth part), and at this time, the activated bandwidth part and the downlink bandwidth part are called to form a bandwidth part pair.

2. Bandwidth portion grouping

When it is desired to support a terminal to transmit data using multiple active downlink bandwidth portions and multiple active uplink bandwidth portions in a cell at a given time, the following concept of bandwidth portion grouping is proposed. The terminal transmits data by using a plurality of bandwidth parts at the same time by taking at least one activated bandwidth part included in each bandwidth part group as a whole, so that the system compatibility is high and the realization is simple.

The network device may divide a bandwidth portion configured for the same service of the terminal into one bandwidth portion packet, for example, one bandwidth portion packet is used for transmitting an enhanced mobile broadband (eMBB) service, and another bandwidth portion packet is used for transmitting an Ultra Reliable and Low Latency Communication (URLLC) service; or, one bandwidth part packet is used for the access link and the other bandwidth part packet is used for the backhaul link; alternatively, one bandwidth part packet is used for the link between the network device and the terminal, and another bandwidth part packet is used for the link between the terminal and the terminal. Of course, the network device may have other partition criteria, and the present application is not limited thereto.

How the bandwidth portions are grouped is described in detail below for two different grouping schemes.

(1) First wideband partial grouping scheme

The N bandwidth portions configured for the terminal may be configured or represented as G bandwidth portion packets, of which the ith bandwidth portion packet includes N_i,ULA portion of upstream bandwidth and N_i,DLA downstream bandwidth portion. N is above_i,ULA portion of upstream bandwidth and N_i,DLThe number of individual downstream bandwidth portions may be the same or different in the ith bandwidth portion packet.

(2) Second wideband partial grouping scheme

The N bandwidth portions configured for the terminal may be configured or represented as G bandwidth portion groups of whichIs grouped by N_i,ULAn upstream bandwidth part, i.e. the ith bandwidth part packet is an upstream bandwidth part packet; or, the ith bandwidth part packet in the G bandwidth part packets is composed of N_i,DLThe first bandwidth portion is grouped into a first bandwidth portion and the second bandwidth portion is grouped into a second bandwidth portion.

On this basis, the uplink bandwidth part packet may be paired with or correspond to the downlink bandwidth part packet, which is referred to as a bandwidth part packet pairing. Here, it is not distinguished whether FDD mode or TDD mode, and pairing is to support uplink transmission and downlink feedback of the terminal. The number of bandwidth part packets in the bandwidth part packet pair is at least two.

Hereinafter, unless otherwise specified, a bandwidth part packet may refer to a bandwidth part packet in the first bandwidth part packet scheme, or may refer to an upstream bandwidth part packet and/or a downstream bandwidth part packet in the second bandwidth part packet.

In addition, based on the bandwidth part packet, the terminal has two possible transmission modes, i.e., a Frequency Division Multiplexing (FDM) mode and a Time Division Multiplexing (TDM) mode.

In FDM mode, the terminal may transmit data using these active bandwidth parts in parallel, e.g., one bandwidth part packet for transmitting eMBB traffic and another bandwidth part packet for transmitting URLLC traffic; or, one bandwidth part packet is used for the access link and the other bandwidth part packet is used for the backhaul link; alternatively, one bandwidth part packet is used for the link between the network device and the terminal, and the other bandwidth part packet is used for the link between the terminal and the terminal. The quality of service (QoS) requirement to be met at this point may be the (overall or average) transmission rate/throughput over each of the bandwidth parts of the packet.

In TDM mode, the terminal uses only the bandwidth part of one of the bandwidth part packets for data transmission at a given time, but by activating multiple bandwidth parts belonging to different bandwidth part packets, it is possible for the terminal to respond to different services quickly (e.g., switching of zero delay between bandwidth parts) without increasing parallel processing capability.

It should be understood that, in the present application, if at least one bandwidth part in one bandwidth part packet is in an active state, the bandwidth part packet is considered to be in the active state, and if all bandwidth parts in one bandwidth part packet are in a deactivated state, the bandwidth part is considered to be in a deactivated state.

It is also to be understood that deactivation may be understood as not transmitting data, but that the bandwidth portion may still be active when not transmitting data. For example, in TDM mode, a terminal uses only the bandwidth part of one of the bandwidth part packets for data transmission at a given time. In addition, the terminal needs to blindly detect the downlink control channel on the activated downlink bandwidth portion, but not on the deactivated downlink bandwidth portion, and in the subsequent evolution, the terminal may not blindly detect the downlink control channel on the activated downlink bandwidth portion, for example, in the case of supporting the inter-bandwidth packet scheduling. Cross-bandwidth portion packet scheduling and self-contained scheduling for bandwidth portion packets are explained in detail below.

It should be understood that the bandwidth part packet may have the characteristics of a self-contained transmission. The self-contained transmission means that when the downlink control signaling is used for activating/deactivating the granularity of the bandwidth part, or the downlink control signaling is used for activating/deactivating the granularity of the bandwidth part, namely, switching the bandwidth part, for the first bandwidth part grouping scheme, the bandwidth part carrying the downlink control signaling and the bandwidth part indicated by the downlink control signaling belong to the same bandwidth part grouping; for the second bandwidth part grouping scheme, when the bandwidth part indicated by the downlink control signaling is the downlink bandwidth part, the bandwidth part carrying the downlink control signaling and the bandwidth part indicated by the downlink control signaling belong to the same downlink bandwidth part grouping, and when the bandwidth part indicated by the downlink control signaling is the uplink bandwidth part, the bandwidth part carrying the downlink control signaling and the bandwidth part indicated by the downlink control signaling belong to the paired downlink bandwidth part grouping and uplink bandwidth part grouping, respectively.

It should also be understood that the bandwidth part packets may also support the property of scheduling across bandwidth part packets. The cross-bandwidth part packet scheduling means that when data scheduling is performed through downlink control signaling, for a first bandwidth part packet scheme, a bandwidth part carrying the downlink control signaling and a bandwidth part indicated by the downlink control signaling belong to different bandwidth part packets; for the second bandwidth part grouping scheme, when the bandwidth part indicated by the downlink control signaling is the downlink bandwidth part, the bandwidth part carrying the downlink control signaling and the bandwidth part indicated by the downlink control signaling belong to different downlink bandwidth part groups, and when the bandwidth part indicated by the downlink control signaling is the uplink bandwidth part, the downlink bandwidth part group carrying the bandwidth part of the downlink control signaling and the bandwidth part indicated by the downlink control signaling belong to downlink bandwidth part groups and uplink bandwidth part groups which are not paired.

3. Initial access bandwidth portion

The initial access bandwidth part comprises an initial access downlink bandwidth part and an initial access uplink bandwidth part and is used for the terminal to perform initial access and establish connection with the network equipment.

The initial access downlink bandwidth part is determined by a Master Information Block (MIB) notification. For example, the terminal finds a synchronization signal block by blindly detecting a synchronization signal grid, information carried in the MIB in the synchronization signal block includes an offset between a lowest position of a frequency domain of an initially accessed downlink bandwidth part and a lowest position of the frequency domain of the synchronization signal block, and a bandwidth of the initially accessed downlink bandwidth part, and the terminal determines the initially accessed downlink bandwidth part according to the MIB. The terminal receives a first system Message (system information block 1, SIB 1), a Random Access Response (RAR), and a Message 4(Message 4) in the initial access downlink bandwidth part, and a scheduling signaling of these messages.

In another implementation, the frequency domain position and bandwidth of the bandwidth part of the initial access downlink carrier may be defined to be the same as the frequency domain position and bandwidth of a control channel resource set (core) of the scheduling SIB 1. At this time, the MIB may inform the offset between the lowest frequency-domain position of the CORESET and the lowest frequency-domain position of the synchronization signal block, and the bandwidth of the CORESET, to indirectly indicate the initial access downlink carrier bandwidth part.

The initial access uplink bandwidth part is determined by SIB 1 notification. For example, the message carried in SIB 1 includes a first frequency offset (offset1) of the reference point a (reference point a) with respect to a reference frequency position (e.g., the lowest subcarrier of the lowest RB of the synchronization signal block), a second frequency offset (offset2) of the uplink virtual carrier starting Resource Block (RB) with respect to the reference point a, a third frequency offset (offset3) of the starting RB of the initial access uplink bandwidth part with respect to the uplink virtual carrier starting RB, and a bandwidth of the initial access uplink bandwidth part. Wherein, a common RB index may be defined based on the reference point a, the common RBs are numbered from the common RB 0 in a direction of increasing frequency, and the center of the lowest subcarrier of the common RB 0 is the reference point a. The terminal transmits a Physical Random Access Channel (PRACH) and a Message 3(Message 3) in the initial access uplink bandwidth portion.

It should be understood that the initial access bandwidth part may be included in the main bandwidth part packet or may not be included in any bandwidth part packet, which is not limited in the embodiment of the present application. The concept of the primary bandwidth part packet is described first, and then the relationship between the primary bandwidth part packet and the initial access bandwidth part will be described in detail.

4. Main bandwidth partial group

The main bandwidth part packet may be defined as a bandwidth part packet including a bandwidth part for receiving a system message and/or a bandwidth part for initial access.

(1) The primary bandwidth part packet includes a bandwidth part for receiving system messages

The primary bandwidth part packet is used for the terminal to receive the system message, in other words, the terminal receives the system message (including DCI for scheduling the system message) in the primary bandwidth part packet. For example, the terminal may receive the system message on any active portion of the bandwidth. When the system supports the activation of a bandwidth segment at a given time, the terminal will receive a system message. In the scenario of multiple activated bandwidth parts, if a terminal still needs to receive a system message on each activated bandwidth part, firstly, because contents carried by the system messages are not different, multiple copies of the system messages can not be received and gain can not be obtained, and secondly, the terminal needs to blindly detect a plurality of DCIs for scheduling the system messages, so that the number of blindness detections of the terminal can be increased, and further, the energy consumption of the terminal is increased. Therefore, the behavior of the terminal can be limited, i.e. in the scenario of multiple active bandwidth portions, the terminal also only needs to receive one system message. In this context, the bandwidth part for receiving the system message is defined as one of the active downstream bandwidth parts in the main bandwidth part packet. The non-master bandwidth part packet is referred to herein as a slave bandwidth part packet, but it should be understood that the master bandwidth part packet and the slave bandwidth part packet are merely exemplary names used for convenience of description, and other names may be used, and the present application does not limit the present invention.

Further, in the TDM mode, for the first wideband width portion packet scheme, the main wideband width portion packet is a wideband width portion packet currently used for data transmission, and for the second wideband width portion packet scheme, the main wideband width portion packet is a downstream wideband width portion packet currently used for downstream data transmission or a downstream wideband width portion packet corresponding to an upstream wideband width portion packet currently used for upstream data transmission. By dynamically switching the partial packet of the main bandwidth, the terminal can quickly respond to different services without increasing the parallel processing capacity. In addition, the terminal blindly detects downlink control information only in the main bandwidth part packet.

(2) The primary bandwidth part packet includes a part for initial access bandwidth

In this case, the initial access bandwidth part is included in the main bandwidth part packet, and thus, the main bandwidth part packet may be determined by performing division of the bandwidth part according to the position of the initial access bandwidth part. In particular, the network device may configure the primary bandwidth portion packet in either an implicit or explicit case.

If the main bandwidth part packet is implicitly configured, the terminal may determine whether the bandwidth part packet is the main bandwidth part packet according to whether the initial access downlink bandwidth part is included in the bandwidth part packet when the bandwidth part packet is configured. If the bandwidth part packet contains an initial access downlink bandwidth part, the bandwidth part packet is a main bandwidth part packet; conversely, the bandwidth part packet is not a main bandwidth part packet.

If the primary bandwidth portion packet is explicitly configured, the network device and the terminal may associate the initial access bandwidth portion into the primary bandwidth portion packet.

For the case of the display configuration, for example, the initial access bandwidth part is bandwidth part 0, and the network device is additionally configured with 3 bandwidth parts, i.e., bandwidth part 1, bandwidth part 2, and bandwidth part 3. The network device configures 2 bandwidth part packets, wherein the bandwidth part packet 1 includes a bandwidth part 1, the bandwidth part packet 2 includes a bandwidth part 2 and a bandwidth part 3, and the network device configures the bandwidth part packet 1 as a main bandwidth part packet, and then the bandwidth part packet 1 further includes an initial access downstream bandwidth part, that is, the bandwidth part packet 1 includes a bandwidth part 0 and a bandwidth part 1, and the bandwidth part packet 2 includes a bandwidth part 2 and a bandwidth part 3.

As another example, the initial access bandwidth part is bandwidth part 0, and the network device is additionally configured with 4 bandwidth parts, that is, bandwidth part 1, bandwidth part 2, bandwidth part 3, and bandwidth part 4. The network device configures 2 a bandwidth part packet, wherein the bandwidth part packet 1 includes a bandwidth part 1 and a bandwidth part 2, the bandwidth part packet 2 includes a bandwidth part 3 and a bandwidth part 4, and the network device configures the bandwidth part packet 1 as a main bandwidth part packet, then the bandwidth part packet 1 further includes an initial access downstream bandwidth part, that is, the bandwidth part packet 1 includes a bandwidth part 0, a bandwidth part 1 and a bandwidth part 2, and the bandwidth part packet 2 includes a bandwidth part 3 and a bandwidth part 4.

It should be appreciated that configuring the initial access downlink bandwidth part in one downlink bandwidth part packet is advantageous to ensure the self-contained transmission characteristics of the bandwidth part packet, especially in case that the terminal is configured with only one (downlink) bandwidth part packet. When the bandwidth part is allowed to be switched to the initial access downlink bandwidth part by the indication of the downlink control signaling, the initial access downlink bandwidth part needs to be configured in one downlink bandwidth part packet. When the terminal is configured with only one (downstream) bandwidth part packet, the bandwidth part packet may also be defaulted as the main bandwidth part packet.

In the application, the bandwidth part group where the initial access bandwidth part is located is defined as the main bandwidth part group, which is beneficial to saving the overhead of sending the system message on the network equipment side. One possible application scenario is FDM mode, where the terminal transmits data using these active bandwidth portions in parallel. Because the network device must send the system message on the initial access downlink bandwidth part, that is, the bandwidth part packet where the initial access downlink bandwidth part is located necessarily includes the system message, and the bandwidth part packet is defined as the main bandwidth part packet, the network device does not need to send the system message in other bandwidth part packets, thereby saving the overhead of the system message in the network.

(3) The initial access bandwidth portion is not included in any bandwidth portion packet

In this case, the network device needs to indicate the primary bandwidth portion packet. The definition may also be modified as: the initial access bandwidth portion is not in the main bandwidth portion packet.

For example, the initial access bandwidth part is bandwidth part 0, and the network device is additionally configured with 4 bandwidth parts, i.e. bandwidth part 1, bandwidth part 2, bandwidth part 3 and bandwidth part 4. The network device configures 2 a bandwidth part packet, wherein the bandwidth part packet 1 includes a bandwidth part 1 and a bandwidth part 2, the bandwidth part packet 2 includes a bandwidth part 3 and a bandwidth part 4, and the network device configures the bandwidth part packet 1 as a main bandwidth part packet, the terminal is finally configured with: a bandwidth part packet 1 including a bandwidth part 1 and a bandwidth part 2, a bandwidth part packet 2 including a bandwidth part 3 and a bandwidth part 4, and an initial access bandwidth part independent of any one of the bandwidth part packets, i.e., a bandwidth part 0.

It should be appreciated that configuring the initial access downstream bandwidth portion outside of any one bandwidth portion packet facilitates dynamically switching the main bandwidth portion packet. In TDM mode, that is, a terminal uses only one of a plurality of bandwidth part packets for data transmission at a given time, for the first bandwidth part packet scheme, the main bandwidth part packet is a bandwidth part packet currently used for data transmission, and for the second bandwidth part packet scheme, the main bandwidth part packet is a downlink bandwidth part packet currently used for downlink data transmission or a downlink bandwidth part packet corresponding to an uplink bandwidth part packet currently used for uplink data transmission. Through the dynamic switching of the main bandwidth part packet, the terminal can quickly respond to different services without increasing the parallel processing capacity, and the characteristic of self-contained transmission of the main bandwidth part packet is also favorably ensured. In addition, the terminal may blindly detect downlink control information only in the primary bandwidth part packet.

In one possible implementation, the relationship between the initial access bandwidth portion and the bandwidth portion grouping may be determined according to different situations, i.e. the above case (2) or case (3) is adopted.

Specifically, when the number of bandwidth parts additionally configured by the network device is less than N, the initial access bandwidth part is in the main bandwidth part group, i.e. the above case (2); when the number of bandwidth parts additionally configured by the network device is greater than or equal to N, the initial access bandwidth part may not be included in any one bandwidth part packet, i.e. case (3) above.

For example, only 2 bits at most in the downlink control information are used to indicate the configured bandwidth part, and therefore, when the number of the additionally configured bandwidth parts is less than 4(N is 4), it is necessary to support indicating the initial access bandwidth part by the downlink control information; and when the number of the additionally configured bandwidth parts is greater than or equal to 4, the indication of the initial access bandwidth part through the downlink control information may not be supported.

As an alternative embodiment, in TDM mode, the initial access bandwidth part may not be in any bandwidth part packet, or the initial access bandwidth part may not be in the main bandwidth part packet; in FDM mode, the initial access bandwidth portion may be in a primary bandwidth portion packet.

For the understanding of the embodiments of the present application, a communication system suitable for the embodiments of the present application will be briefly described with reference to fig. 1. Fig. 1 is a schematic diagram of a communication system 100 suitable for use with embodiments of the present application. As shown in fig. 1, the communication system 100 includes at least two communication devices, for example, a network device 110 and a terminal 120, wherein data communication between the network device 110 and the terminal 120 can be performed through a wireless connection.

On the basis of the above bandwidth part grouping, how to realize the energy saving of the terminal in the scene of activating the bandwidth part becomes a technical problem to be solved urgently. In view of this, the present application provides a communication method, which can implement the backoff of the activated bandwidth part, thereby saving the energy consumption of the terminal device. The communication method provided by the present application is described in detail below with reference to fig. 2 to 3.

Fig. 2 is an exemplary flow chart of a communication method 200 according to an embodiment of the present application. It should be understood that the terminal in the method shown in fig. 2 may correspond to any of the terminals shown in fig. 1.

S210, the terminal determines the activated first bandwidth part;

s220, the terminal switches from the first bandwidth portion to a first default bandwidth portion, wherein the first default bandwidth portion is a downstream bandwidth portion in a first bandwidth portion group.

As an alternative embodiment, on the basis of grouping the bandwidth parts, the switching of the bandwidth parts may be divided into two cases, namely, a cross-group switching and a present group switching, which is not limited in this embodiment of the present application. For the group switching, the first bandwidth part may belong to the above-described first bandwidth part group. For cross-group switching, the first bandwidth part may belong to a second bandwidth part group, in which case the terminal is actually switched from a bandwidth part in the second bandwidth part group to one bandwidth part in the first bandwidth part group.

As an alternative embodiment, the first bandwidth part packet is used for receiving system messages and/or for initial access.

In the present application, for the fallback of the activated bandwidth part, the network device may configure three specific implementation manners, which are described in detail below for three cases respectively.

Situation one

As an alternative embodiment, the first bandwidth part group includes a first default bandwidth part, and the terminal may switch from the first bandwidth part to the first default bandwidth part.

Specifically, the first bandwidth part group comprises a first default bandwidth part, optionally, the first bandwidth part group is a main bandwidth part group; the terminal may fall back directly from the activated first bandwidth part to the first default bandwidth part in the main bandwidth part packet. The network device may configure the first default bandwidth part for the terminal in an explicit or implicit manner, which is not limited in this embodiment of the present application.

In the case where the first bandwidth part packet is explicitly configured, the network device may first determine the first bandwidth part packet, configure the first bandwidth part packet for the terminal, then select a downlink bandwidth part from the first bandwidth part packet as the first default bandwidth part, i.e., select the first default bandwidth part from the main bandwidth part packet, and then signal the first default bandwidth part to the terminal.

In the case where the first bandwidth part packet is implicitly configured, the network device may select a first default bandwidth part, and then determine a bandwidth part packet in which the first default bandwidth part is located as a first bandwidth part packet, which is a main bandwidth part packet. In this case, it may be specified by a protocol that the default bandwidth part is configured only in the primary bandwidth part packet, and the terminal may determine the first default bandwidth part according to the configuration of the network device, thereby determining the first bandwidth part packet to which the first default bandwidth part belongs as the primary bandwidth part packet. A typical application scenario for this configuration method is when the initial access bandwidth part does not belong to any bandwidth part packet, the main bandwidth part packet can be determined by this configuration method. Before the dynamic switching of the main bandwidth part packet, the terminal needs to know in which bandwidth part packet the first transmission is.

In the above configuration case, the terminal may maintain only one timer for the bandwidth partial backoff (i.e., the first timer described below).

As an alternative embodiment, the switching of the terminal from the first bandwidth portion to a first default bandwidth portion comprises: the terminal switches from the first bandwidth portion to the first default bandwidth portion when a first timer expires.

It should also be appreciated that configuring the first default bandwidth portion only in the main bandwidth portion grouping facilitates more efficient power conservation by the terminal. One requirement for the active bandwidth part is to use these active carrier bandwidth parts in parallel to transmit data, when the quality of service (QoS) requirement to be met is the (overall or average) transmission rate/throughput. However, when the terminal enters the energy saving state, the QoS requirement to be satisfied is the energy consumption of the terminal. Therefore, when the terminal enters the power saving state, if the active bandwidth part is still maintained, the QoS requirement is not affected.

However, as described above, if the terminal has only one default carrier bandwidth part, the slave carrier bandwidth part packet needs to be deactivated when the terminal is power saving. When the slave carrier bandwidth part is grouped for services such as URLLC, if a burst URLLC service arrives, the terminal needs to activate the slave carrier bandwidth part first and then perform data transmission. This may introduce unnecessary delay (especially when only semi-static carrier bandwidth part packet activation/deactivation is supported), which severely impacts the low-latency QoS requirements of URLLC. Therefore, in this scenario, the following case two can be adopted.

As another alternative, if the first default bandwidth part is not configured in the first bandwidth part packet, the terminal may switch from the activated first bandwidth part to the initial access bandwidth part.

It should be understood that the number of the initial access bandwidth part is one, and the initial access bandwidth part may be included in the main bandwidth part packet, may not be included in the main bandwidth part packet, or the initial access bandwidth part is not included in any bandwidth part packet, which is not limited in the embodiment of the present application.

Situation two

As an alternative embodiment, the second bandwidth part packet includes a second default bandwidth part therein; the terminal may switch from the first bandwidth portion to the second default bandwidth portion.

Specifically, the first bandwidth part belongs to a second bandwidth part group, and the second bandwidth part group includes a second default bandwidth part. The terminal may switch from the activated first bandwidth part to a second default bandwidth part. The number of the second default bandwidth part may be plural.

In one possible implementation, there are a second bandwidth part packets, B of the a second bandwidth part packets may include a second default bandwidth part, and each of the B second bandwidth part packets includes a second default bandwidth part, where B is less than or equal to a. For example, there are 5 second bandwidth part packets, wherein each of the 3 second bandwidth part packets has a respective one of the second default bandwidth parts. As another example, there are 5 second bandwidth part packets, each of the 5 second bandwidth part packets having a respective one of the second default bandwidth parts.

In one possible implementation, each of the second bandwidth part packets may be configured with a second default bandwidth part. The configuration method is beneficial to the terminal to quickly respond to different burst services.

In the foregoing configuration, the network device and the terminal may maintain only one timer, or may maintain an independent timer corresponding to each second default bandwidth portion, which is not limited in this embodiment of the present application.

When the terminal maintains only one timer, the terminal rolls back from the activated first bandwidth portion to the corresponding second default bandwidth portion if the timer expires. Wherein if a first bandwidth portion corresponds to a second default bandwidth portion, the first bandwidth portion and the second default bandwidth portion belong to the same bandwidth portion group. For example, if bandwidth part 1, bandwidth part 2, and bandwidth part 3 are activated 3 first bandwidth parts, bandwidth part 1 and bandwidth part 2 belong to bandwidth part packet 1, and bandwidth part 3 belongs to bandwidth part packet 2, then bandwidth part packet 1 has a second default bandwidth part, and bandwidth part packet 2 has a second default bandwidth part, the terminal may fall back from bandwidth part 1 and bandwidth part 2 to the second default bandwidth part in bandwidth part packet 1, and from bandwidth part 3 to the second default bandwidth part in bandwidth part packet 2.

When the terminal maintains an independent timer corresponding to each second default bandwidth part, assuming that the timer 1 corresponds to the second default bandwidth part in the bandwidth part packet 1, if the timer 1 expires, only the activated bandwidth part in the bandwidth part packet 1 corresponding to the timer 1 is backed off, that is, the terminal may switch the activated bandwidth part in the bandwidth part packet 1 corresponding to the timer 1 to the second default bandwidth part in the bandwidth part packet 1 corresponding to the timer 1.

In addition to this, in this case, the network device may also reconfigure the restart condition of the timer.

For the first wideband section grouping scheme, if the terminal receives the terminal-specific downlink control signaling in the wideband section grouping a, the terminal restarts the timer corresponding to the wideband section grouping 1, wherein the terminal-specific downlink control signaling may be uplink scheduling DCI or downlink scheduling DCI.

For the second bandwidth part grouping scheme, if the terminal receives the downlink scheduling DCI in the downlink bandwidth part grouping B or the terminal receives the uplink scheduling DCI in the uplink bandwidth part grouping C corresponding to the downlink bandwidth part grouping B, the terminal restarts only the timer corresponding to the downlink bandwidth part grouping B.

As another alternative, there is at least one bandwidth part packet not configured with the second default bandwidth part, and the terminal may switch from the first bandwidth part of the corresponding bandwidth part packet not configured with the second default bandwidth part in the first bandwidth part to the initial access bandwidth part.

It should be understood that the initial access bandwidth part may be included in the main bandwidth part packet, may not be included in the main bandwidth part packet, or may not be included in any bandwidth part packet, which is not limited in the embodiment of the present application.

Specifically, when the terminal maintains only one timer, if the timer expires, the terminal may roll back an activated bandwidth part of the bandwidth part packet to which the second default bandwidth part is not configured to the initial access bandwidth part. When the terminal maintains an independent timer for each bandwidth part packet of the at least one bandwidth part packet, for the bandwidth part packet without the second default bandwidth part, taking the bandwidth part packet 1 as an example, after the timer corresponding to the bandwidth part packet 1 expires, the terminal may only rollback the activated first bandwidth part of the bandwidth part packet 1 to the initial access bandwidth part. Optionally, for a bandwidth part packet without a second default bandwidth part, the corresponding timer is the same timer.

Situation three

As an alternative embodiment, the first bandwidth part packet includes a first default bandwidth part therein, and the second bandwidth part packet includes a second default bandwidth part therein; switching the terminal from the first bandwidth portion to a first default bandwidth portion, comprising: switching the terminal from the first bandwidth portion to the second default bandwidth portion; the terminal switches from the second default bandwidth portion to the first default bandwidth portion.

Optionally, the first bandwidth part packet is a master bandwidth part packet, the second bandwidth part packet includes a slave bandwidth part packet, and when performing the first level of fallback, the terminal may switch from the activated first bandwidth part to a second default bandwidth part corresponding to the slave bandwidth part packet, and when performing the second level of fallback, the terminal may switch from the second default bandwidth part in the slave bandwidth part packet to the first default bandwidth part in the master bandwidth part packet.

As an alternative embodiment, the switching of the terminal from the first bandwidth portion to a first default bandwidth portion comprises: when the duration of a second timer is greater than a first threshold value, the terminal switches from the first bandwidth part to the second default bandwidth part; and when the duration of the second timer is greater than a second threshold value, the terminal is switched from the second default bandwidth part to the first default bandwidth part.

As an alternative embodiment, the switching of the terminal from the first bandwidth portion to the second default bandwidth portion comprises: when a third timer expires, the terminal switches from the first bandwidth portion to the second default bandwidth portion; the terminal switching from the second default bandwidth part to the first default bandwidth part comprises: when a fourth timer expires, the terminal switches from the second default bandwidth portion to the first default bandwidth portion.

As another alternative embodiment, there is at least one bandwidth part packet to which the second default bandwidth part is not configured. In this configuration, the terminal may perform the above-described two-stage backoff operation on a bandwidth part packet configured with the second default bandwidth part, and perform one-stage backoff operation on a bandwidth part packet not configured with the second default bandwidth part. The terminal eventually falls back to the initial access bandwidth portion regardless of whether the first default bandwidth portion is configured.

Specifically, if the activated first bandwidth part corresponds to 5 bandwidth part packets, each of the 3 bandwidth part packets is configured with a second default bandwidth part, and the other 2 bandwidth part packets are not configured with the second default bandwidth part. The terminal may perform a two-level fallback operation for the 3 wideband packets by first switching from a first bandwidth portion corresponding to the 3 wideband packets to a second default bandwidth portion corresponding to the 3 wideband packets, and then switching from the 3 second default bandwidth portions to an initial access bandwidth portion. The terminal may perform a level one fallback operation for the further 2 bandwidth part packets, i.e. switch directly from the first bandwidth part corresponding to the further 2 bandwidth part packets to the initial access bandwidth part.

It should be understood that the back-off of the bandwidth part packet configured with the second default bandwidth part and the back-off of the bandwidth part packet not configured with the second default bandwidth part may use the same timer or different timers. Specifically, the timer for backing off the bandwidth part packet not configured with the second default bandwidth part (i.e. switching from the activated bandwidth part in the bandwidth part packet not configured with the second default bandwidth part to the initial access bandwidth part) may be the same as the timer for the first-level backing off of the bandwidth part packet configured with the second default bandwidth part (i.e. switching from the activated bandwidth part in the bandwidth part packet configured with the second default bandwidth part to the second default bandwidth part), or may be the same as the timer for the second-level backing off of the bandwidth part packet configured with the second default bandwidth part (i.e. switching from the second default bandwidth part to the initial access bandwidth part), or, of course, the bandwidth part packet not configured with the second default bandwidth part may also be a different timer, the embodiments of the present application do not limit this.

It should also be understood that for the two-level fallback scheme, if a first default bandwidth part is configured, in general, each bandwidth part packet in the bandwidth part packet corresponding to the first bandwidth part is configured with a second default bandwidth part, so as to ensure that the terminal can finally fallback from the activated first bandwidth part to the first default bandwidth part.

Fig. 3 is an exemplary flow chart of a communication method 300 according to an embodiment of the present application. It should be understood that the network devices in the method illustrated in fig. 3 may correspond to the network devices in the system 100 illustrated in fig. 1.

S310, the network device determines a plurality of bandwidth part packets, wherein a first bandwidth part packet in the plurality of bandwidth part packets comprises a first default bandwidth part, and the first bandwidth part packet is used for receiving a system message and/or used for initial access;

s320, the network device configures the first default bandwidth portion for the terminal.

According to the communication method, the network device determines the plurality of bandwidth part groups, and configures the first default bandwidth part for the terminal based on the plurality of bandwidth part groups, so that the terminal can execute rollback of the plurality of bandwidth parts according to the configuration of the network device, namely, switch from the activated bandwidth part to the first default bandwidth part, and therefore energy consumption of the terminal device is saved, and system performance is improved.

In this embodiment of the present application, the network device may configure the first default bandwidth part for the terminal in multiple ways, which is not limited in this embodiment of the present application.

As an optional embodiment, the method further comprises: the network device selects a downstream bandwidth portion from the first bandwidth portion packet as the first default bandwidth portion.

Specifically, in the case that the first bandwidth part packet is explicitly configured, the network device may determine the first bandwidth part packet, configure the first bandwidth part packet for the terminal, select a downlink bandwidth part from the first bandwidth part packet as the first default bandwidth part, that is, select a first default bandwidth part from the main bandwidth part packet, and signal the first default bandwidth part to the terminal.

As an optional embodiment, the method further comprises: the network equipment selects a downlink bandwidth part from the configured bandwidth parts as the first default bandwidth part; the network device determining a plurality of bandwidth part packets, comprising: the network device determines a bandwidth part packet to which the first default bandwidth part belongs as the first bandwidth part packet.

Specifically, in the case where the first bandwidth part packet is implicitly configured, the network device may first select a first default bandwidth part, the selectable set of which is a configured bandwidth part, and then, the network device may determine a bandwidth part packet in which the first default bandwidth part is located as the first bandwidth part packet, which is a main bandwidth part packet. In this case, it may be specified by a protocol that the default bandwidth part is configured only in the primary bandwidth part packet, and the terminal may determine the first default bandwidth part according to the configuration of the network device, thereby determining the first bandwidth part packet to which the first default bandwidth part belongs as the primary bandwidth part packet.

A typical application scenario for this configuration method is when the initial access bandwidth part does not belong to any bandwidth part packet, the main bandwidth part packet can be determined by this configuration method. Before the dynamic switching of the main bandwidth part packet, the terminal needs to know in which bandwidth part packet the first transmission is.

As an optional embodiment, the method further comprises: the network device configures a second default bandwidth portion for the terminal, a second bandwidth portion packet of the plurality of bandwidth portion packets including the second default bandwidth portion.

Specifically, in the case that the network device configures the first default bandwidth part, the network device may further configure a second default bandwidth part, so that the terminal performs two-stage fallback, i.e. fallback from the activated first bandwidth part to the second default bandwidth part and then fallback from the second default bandwidth part to the first default bandwidth part. The selectable set of second default bandwidth portions are configured bandwidth portion groupings. In other words, the configured bandwidth part packet includes a bandwidth part packet 1 and a bandwidth part packet 2, and the network device needs to configure a second default bandwidth part for the bandwidth part packet 2, so that the network device can select a downstream bandwidth part from the bandwidth parts included in the bandwidth part packet 2 as the second default bandwidth part of the bandwidth part packet 2.

It should be understood that the number of the second default bandwidth part may be one or more, and the second default bandwidth part belongs to at least one second bandwidth part packet of the plurality of bandwidth part packets. In one possible implementation, there are a second bandwidth part packets, B of the a second bandwidth part packets may include a second default bandwidth part, and each of the B second bandwidth part packets includes a second default bandwidth part, where B is less than or equal to a. For example, there are 5 second bandwidth part packets, wherein each of the 3 second bandwidth part packets has a respective one of the second default bandwidth parts. As another example, there are 5 second bandwidth part packets, each of the 5 second bandwidth part packets having a respective one of the second default bandwidth parts.

As an alternative embodiment, the second bandwidth part packet comprising the second default bandwidth part is used for receiving system messages and/or for initial access.

As an alternative embodiment, the second bandwidth part packet of the plurality of bandwidth part packets comprises the activated first bandwidth part.

The above detailed description is directed to examples of communication methods provided herein. It is understood that the terminal and the network device include corresponding hardware structures and/or software modules for performing the respective functions in order to implement the above-described functions. Those of skill in the art would readily appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as hardware or combinations of hardware and computer software. Whether a function is performed as hardware or computer software drives hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

Fig. 4 shows a schematic structural diagram of an apparatus 400 provided in the present application. The apparatus 400 comprises: a determination unit 410 and a switching unit 420.

A determining unit 410 for determining the activated first bandwidth part;

a switching unit 420 for switching from the first bandwidth portion to a first default bandwidth portion;

wherein the first default bandwidth portion is a downstream bandwidth portion of a first bandwidth portion group, the activated first bandwidth portion belongs to a second bandwidth portion group, and the first bandwidth portion group is used for receiving system messages and/or for initial access.

The device of the embodiment of the application realizes the rollback of the bandwidth part by switching the activated bandwidth part to the default bandwidth part, is favorable for saving the energy consumption of the terminal and improves the system performance.

Optionally, a second default bandwidth part is included in the second bandwidth part packet; the switching unit 420 is specifically configured to: switching from the first bandwidth portion to the second default bandwidth portion; switching from the second default bandwidth portion to the first default bandwidth portion.

Optionally, the switching unit 420 is specifically configured to: switching from the first bandwidth portion to the first default bandwidth portion when a first timer expires.

Optionally, the switching unit 420 is specifically configured to: switching from the first bandwidth portion to the second default bandwidth portion when a duration of a second timer is greater than a first threshold; when the duration of the second timer is greater than a second threshold value, switching from the second default bandwidth portion to the first default bandwidth portion.

Optionally, the switching unit 420 is specifically configured to: switching from the first bandwidth portion to the second default bandwidth portion when a third timer expires; switching from the second default bandwidth portion to the first default bandwidth portion when a fourth timer expires.

The apparatus 400 may be a communication device (e.g., a terminal) or a chip within a communication device. When the communication apparatus is a communication device, the processing unit may be a processor, and the transmitting unit and the receiving unit may be transceivers; the communication device may further include a storage unit, which may be a memory; the storage unit is used for storing instructions, and the processing unit executes the instructions stored by the storage unit so as to enable the communication equipment to execute the method. When the communication device is a chip within a communication apparatus, the processing unit may be a processor, and the transmitting unit and the receiving unit may be input/output interfaces, pins, circuits, or the like; the processing unit executes instructions stored in a storage unit (e.g., a register, a cache memory, etc.) within the chip or located outside the chip (e.g., a read-only memory, a random access memory, etc.) to cause the communication device to perform the corresponding steps performed by the terminal

It can be clearly understood by those skilled in the art that, when the apparatus 400 is a terminal, the steps performed by the apparatus 400 and the corresponding beneficial effects can refer to the related description of the terminal in fig. 2, and are not described herein again for brevity.

Fig. 5 shows a schematic structural diagram of an apparatus 500 provided in the present application. The apparatus 500 comprises: a determination unit 510 and a configuration unit 520.

A determining unit 510 for determining a plurality of bandwidth part packets, a first bandwidth part packet of the plurality of bandwidth part packets comprising a first default bandwidth part, the first bandwidth part packet being used for receiving system messages and/or for initial access;

a configuring unit 520, configured to configure the first default bandwidth part for the terminal.

The apparatus of the embodiment of the application determines, by the network device, the plurality of bandwidth part packets, and configures, for the terminal, the first default bandwidth part based on the plurality of bandwidth part packets, so that the terminal can perform fallback of the plurality of bandwidth parts according to the configuration of the network device, that is, switch from the activated plurality of bandwidth parts to the first default bandwidth part, which is beneficial to saving energy consumption of the terminal device and improving system performance.

Optionally, the determining unit 510 is further configured to: selecting a downstream bandwidth portion from the first bandwidth portion grouping as the first default bandwidth portion.

Optionally, the determining unit 510 is further configured to: selecting a downlink bandwidth part from the configured bandwidth parts as the first default bandwidth part; determining a bandwidth part packet to which the first default bandwidth part belongs as the first bandwidth part packet.

Optionally, the configuration unit 520 is further configured to: configuring a second default bandwidth portion for the terminal, a second bandwidth portion packet of the plurality of bandwidth portion packets including the second default bandwidth portion.

Optionally, a second bandwidth part packet comprising the second default bandwidth part is used for receiving system messages and/or for initial access.

Optionally, a second bandwidth part packet of the plurality of bandwidth part packets comprises the activated first bandwidth part.

The apparatus 500 may be a communication device (e.g., a network device) or a chip within a communication device. When the communication apparatus is a communication device, the processing unit may be a processor, and the transmitting unit and the receiving unit may be transceivers; the communication device may further include a storage unit, which may be a memory; the storage unit is used for storing instructions, and the processing unit executes the instructions stored by the storage unit so as to enable the communication equipment to execute the method. When the communication device is a chip within a communication apparatus, the processing unit may be a processor, and the transmitting unit and the receiving unit may be input/output interfaces, pins, circuits, or the like; the processing unit executes instructions stored in a storage unit (e.g., a register, a cache memory, etc.) within the chip or located outside the chip (e.g., a read-only memory, a random access memory, etc.) to cause the communication device to perform the corresponding steps performed by the network device

It is clear to those skilled in the art that, when the apparatus 500 is a network device, the steps performed by the apparatus 500 and the corresponding beneficial effects can refer to the related description of the network device in fig. 3, and are not described herein again for brevity.

It should be understood that the above division of the units is only a functional division, and other division methods may be possible in actual implementation.

It can be clearly understood by those skilled in the art that the detailed working process of the above-described apparatuses and units and the technical effects generated by the execution steps can refer to the description in the foregoing corresponding method embodiments, and are not repeated herein for brevity.

The communication device may be a chip, and the processing unit may be implemented by hardware or software, and when implemented by hardware, the processing unit may be a logic circuit, an integrated circuit, or the like; when implemented in software, the processing unit may be a general-purpose processor implemented by reading software code stored in a memory unit, which may be integrated in the processor or located external to the processor, separately.

The apparatus provided in the present application is further described below by taking the above-mentioned apparatus as a terminal or a network device as an example.

Fig. 6 is a schematic structural diagram of a terminal 10 provided in the present application. For convenience of explanation, fig. 6 shows only main components of the terminal. As shown in fig. 6, the terminal 10 includes a processor, a memory, a control circuit, an antenna, and an input-output device.

The processor is mainly configured to process the communication protocol and the communication data, control the entire terminal, execute a software program, and process data of the software program, for example, to support the terminal to perform the actions described in the foregoing resource allocation method or communication method embodiment. The memory is used primarily for storing software programs and data. The control circuit is mainly used for converting baseband signals and radio frequency signals and processing the radio frequency signals. The control circuit and the antenna together, which may also be called a transceiver, are mainly used for transceiving radio frequency signals in the form of electromagnetic waves. Input and output devices, such as touch screens, display screens, keyboards, etc., are used primarily for receiving data input by a user and for outputting data to the user.

When the terminal is started, the processor can read the software program in the storage unit, interpret and execute the instruction of the software program, and process the data of the software program. When data needs to be sent wirelessly, the processor outputs a baseband signal to the radio frequency circuit after performing baseband processing on the data to be sent, and the radio frequency circuit performs radio frequency processing on the baseband signal and sends the radio frequency signal outwards in the form of electromagnetic waves through the antenna. When data is sent to the terminal, the radio frequency circuit receives radio frequency signals through the antenna, converts the radio frequency signals into baseband signals and outputs the baseband signals to the processor, and the processor converts the baseband signals into the data and processes the data.

Those skilled in the art will appreciate that fig. 6 shows only one memory and processor for ease of illustration. In an actual terminal, there may be multiple processors and memories. The memory may also be referred to as a storage medium or a storage device, and the like, which is not limited in this application.

As an alternative implementation manner, the processor may include a baseband processor and a central processing unit, where the baseband processor is mainly used to process a communication protocol and communication data, and the central processing unit is mainly used to control the whole terminal, execute a software program, and process data of the software program. The processor in fig. 6 integrates the functions of the baseband processor and the central processing unit, and those skilled in the art will understand that the baseband processor and the central processing unit may also be independent processors, and are interconnected through a bus or the like. Those skilled in the art will appreciate that the terminal may include a plurality of baseband processors to accommodate different network formats, a plurality of central processors to enhance its processing capability, and various components of the terminal may be connected by various buses. The baseband processor can also be expressed as a baseband processing circuit or a baseband processing chip. The central processing unit can also be expressed as a central processing circuit or a central processing chip. The function of processing the communication protocol and the communication data may be built in the processor, or may be stored in the storage unit in the form of a software program, and the processor executes the software program to realize the baseband processing function.

For example, in the embodiment of the present application, the antenna and the control circuit having the transceiving function may be regarded as the transceiving unit 101 of the terminal 10, and the processor having the processing function may be regarded as the processing unit 102 of the terminal 10. As shown in fig. 6, the terminal 10 includes a transceiving unit 101 and a processing unit 102. A transceiver unit may also be referred to as a transceiver, a transceiving device, etc. Optionally, a device for implementing a receiving function in the transceiver 101 may be regarded as a receiving unit, and a device for implementing a transmitting function in the transceiver 101 may be regarded as a transmitting unit, that is, the transceiver 101 includes a receiving unit and a transmitting unit. For example, the receiving unit may also be referred to as a receiver, a receiving circuit, etc., and the sending unit may be referred to as a transmitter, a transmitting circuit, etc.

The terminal shown in fig. 6 can perform each action performed by the terminal in the above method, and here, a detailed description thereof is omitted to avoid redundancy.

Fig. 7 is a schematic structural diagram of a network device provided in the present application, where the network device may be a base station, for example. As shown in fig. 7, the base station may be applied in the communication system shown in fig. 1, and performs the functions of the network device in the above method embodiments. The base station 20 may include one or more radio frequency units, such as a Remote Radio Unit (RRU) 201 and one or more baseband units (BBUs) (which may also be referred to as Digital Units (DUs)) 202. The RRU 201 may be referred to as a transceiver unit, transceiver circuit, or transceiver, etc., which may include at least one antenna 2011 and a radio unit 2012. The RRU 201 is mainly used for transceiving radio frequency signals and converting the radio frequency signals and baseband signals, for example, for transmitting the PDCCH and/or PDSCH in the above method embodiment. The BBU 202 is mainly used for performing baseband processing, controlling a base station, and the like. The RRU 201 and the BBU 202 may be physically disposed together or may be physically disposed separately, that is, distributed base stations.

The BBU 202 is a control center of a base station, and may also be referred to as a processing unit, and is mainly used for performing baseband processing functions, such as channel coding, multiplexing, modulation, spreading, and the like. For example, the BBU (processing unit) 202 can be used to control the base station to execute the operation flow related to the network device in the above method embodiment.

In an embodiment, the BBU 202 may be formed by one or more boards, and the boards may jointly support a radio access network (e.g., an LTE network) with a single access indication, or may respectively support radio access networks with different access schemes (e.g., an LTE network, a 5G network, or other networks). The BBU 202 also includes a memory 2021 and a processor 2022, the memory 2021 for storing the necessary instructions and data. For example, the memory 2021 stores QCL information or TCI status in the above-described method embodiments. The processor 2022 is configured to control the base station to perform necessary actions, for example, to control the base station to perform the operation procedures related to the network device in the above method embodiments. The memory 2021 and the processor 2022 may serve one or more boards. That is, the memory and processor may be provided separately on each board. Multiple boards may share the same memory and processor. In addition, each single board can be provided with necessary circuits.

The present application also provides a communication system comprising one or more of the aforementioned network devices, and one or more terminals.

It should be understood that the processor in the embodiments of the present application may be an integrated circuit chip having signal processing capability. In implementation, the steps of the above method embodiments may be performed by integrated logic circuits of hardware in a processor or instructions in the form of software. The processor may be a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic device, or discrete hardware components. The various methods, steps, and logic blocks disclosed in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in a memory, and a processor reads information in the memory and completes the steps of the method in combination with hardware of the processor.

It will be appreciated that the memory in the embodiments of the subject application can be either volatile memory or nonvolatile memory, or can include both volatile and nonvolatile memory. The non-volatile memory may be a read-only memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an electrically Erasable EPROM (EEPROM), or a flash memory. Volatile memory can be Random Access Memory (RAM), which acts as external cache memory. By way of example, but not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic Random Access Memory (SDRAM), double data rate SDRAM, enhanced SDRAM, SLDRAM, Synchronous Link DRAM (SLDRAM), and direct rambus RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to comprise, without being limited to, these and any other suitable types of memory.

The present application also provides a computer-readable medium having stored thereon a computer program which, when executed by a computer, performs the functions of any of the method embodiments described above.

The present application also provides a computer program product which, when executed by a computer, implements the functionality of any of the above-described method embodiments.

In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the application to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored on a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website, computer, server, or data center to another website, computer, server, or data center via wire (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a magnetic tape), an optical medium (e.g., a Digital Video Disk (DVD)), or a semiconductor medium (e.g., a Solid State Disk (SSD)), among others.

It should be appreciated that reference throughout this specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, the various embodiments are not necessarily referring to the same embodiment throughout the specification. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. It should be understood that, in the various embodiments of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

It should also be understood that, in the present application, "when …", "if" and "if" all refer to the fact that the UE or the base station will perform the corresponding processing under certain objective conditions, and are not limited time, and do not require the UE or the base station to perform certain judgment actions, nor do they mean that there are other limitations.

Additionally, the terms "system" and "network" are often used interchangeably herein. The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone.

Herein, the term "at least one of … …" or "at least one of … …" means all or any combination of the listed items, e.g., "at least one of A, B and C", may mean: there are six cases of a alone, B alone, C alone, a and B together, B and C together, and A, B and C together.

It should be understood that in the embodiments of the present application, "B corresponding to a" means that B is associated with a, from which B can be determined. It should also be understood that determining B from a does not mean determining B from a alone, but may be determined from a and/or other information.

Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the examples described in connection with the embodiments disclosed herein may be embodied in electronic hardware, computer software, or combinations of both, and that the components and steps of the examples have been described in a functional general in the foregoing description for the purpose of illustrating clearly the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

Through the above description of the embodiments, those skilled in the art will clearly understand that the present application can be implemented in hardware, firmware, or a combination thereof. When implemented in software, the functions described above may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a computer. Taking this as an example but not limiting: computer-readable media can include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. Furthermore, the method is simple. Any connection is properly termed a computer-readable medium. For example, if software is transmitted from a website, a server, or other remote source using a coaxial cable, a fiber optic cable, a twisted pair, a Digital Subscriber Line (DSL), or a wireless technology such as infrared, radio, and microwave, the coaxial cable, the fiber optic cable, the twisted pair, the DSL, or the wireless technology such as infrared, radio, and microwave are included in the fixation of the medium. Disk and disc, as used herein, includes Compact Disc (CD), laser disc, optical disc, Digital Versatile Disc (DVD), floppy disk and blu-ray disc where disks usually use magnetism to reproduce data, while discs use lasers to reproduce data. Combinations of the above should also be included within the scope of computer-readable media.

In short, the above description is only a preferred embodiment of the present disclosure, and is not intended to limit the scope of the present disclosure. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method of communication, comprising:

the terminal determines the activated first bandwidth part;

switching the terminal from the first bandwidth portion to a second default bandwidth portion;

the terminal switches from the second default bandwidth part to the first default bandwidth part; wherein the first default bandwidth portion is a downstream bandwidth portion of a first bandwidth portion packet, the activated first bandwidth portion belongs to a second bandwidth portion packet, the second bandwidth portion packet includes a second default bandwidth portion, and the first bandwidth portion packet is used for receiving system messages and/or for initial access.

2. The method of claim 1, wherein switching the terminal from the first bandwidth portion to a first default bandwidth portion comprises:

the terminal switches from the first bandwidth portion to the first default bandwidth portion when a first timer expires.

3. The method of claim 1, wherein switching the terminal from the first bandwidth portion to a first default bandwidth portion comprises:

when the duration of a second timer is greater than a first threshold value, the terminal switches from the first bandwidth part to the second default bandwidth part;

and when the duration of the second timer is greater than a second threshold value, the terminal is switched from the second default bandwidth part to the first default bandwidth part.

4. The method of claim 1, wherein switching the terminal from the first bandwidth portion to the second default bandwidth portion comprises:

when a third timer expires, the terminal switches from the first bandwidth portion to the second default bandwidth portion;

the terminal switching from the second default bandwidth part to the first default bandwidth part comprises:

when a fourth timer expires, the terminal switches from the second default bandwidth portion to the first default bandwidth portion.

5. A communications apparatus, comprising:

a determining unit for determining the activated first bandwidth part;

a switching unit for switching from the first bandwidth portion to a second default bandwidth portion, an

Switching from the second default bandwidth portion to a first default bandwidth portion;

wherein the first default bandwidth portion is a downstream bandwidth portion of a first bandwidth portion packet, the activated first bandwidth portion belongs to a second bandwidth portion packet, the second bandwidth portion packet includes a second default bandwidth portion, and the first bandwidth portion packet is used for receiving system messages and/or for initial access.

6. The communication apparatus according to claim 5, wherein the switching unit is specifically configured to:

switching from the first bandwidth portion to the first default bandwidth portion when a first timer expires.

7. The communication apparatus according to claim 5, wherein the switching unit is specifically configured to:

switching from the first bandwidth portion to the second default bandwidth portion when a duration of a second timer is greater than a first threshold;

when the duration of the second timer is greater than a second threshold value, switching from the second default bandwidth portion to the first default bandwidth portion.

8. The communication apparatus according to claim 5, wherein the switching unit is specifically configured to:

switching from the first bandwidth portion to the second default bandwidth portion when a third timer expires; switching from the second default bandwidth portion to the first default bandwidth portion when a fourth timer expires.