WO2019242570A1 - 通信方法和装置 - Google Patents

通信方法和装置 Download PDF

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Publication number
WO2019242570A1
WO2019242570A1 PCT/CN2019/091229 CN2019091229W WO2019242570A1 WO 2019242570 A1 WO2019242570 A1 WO 2019242570A1 CN 2019091229 W CN2019091229 W CN 2019091229W WO 2019242570 A1 WO2019242570 A1 WO 2019242570A1
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WO
WIPO (PCT)
Prior art keywords
bandwidth
bandwidth part
default
bandwidth portion
terminal
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PCT/CN2019/091229
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English (en)
French (fr)
Inventor
李俊超
唐浩
唐臻飞
Original Assignee
华为技术有限公司
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Publication of WO2019242570A1 publication Critical patent/WO2019242570A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0212—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present application relates to the field of communications, and more particularly, to a communication method and apparatus.
  • the two-step resource allocation method is used to discuss and support data transmission between network devices and terminals, that is, the network device can first instruct the terminal A continuous resource in the frequency domain is called a carrier bandwidth part (BWP), and the terminal allocates resources and transmits data in the BWP.
  • BWP carrier bandwidth part
  • a network device can configure an activated bandwidth portion for a terminal first.
  • the bandwidth portion of the terminal will always be activated, and terminal energy consumption will be wasted. Therefore, how to realize the energy saving of the terminal in the above scenario has become an urgent technical problem.
  • the present application provides a communication method and device, which can implement a rollback of a bandwidth part and is beneficial to saving energy consumption of a terminal device.
  • a communication method including: a terminal determining an activated first bandwidth portion; the terminal switching from the first bandwidth portion to a first default bandwidth portion; wherein the first default bandwidth portion Is a downlink bandwidth portion in the first bandwidth portion packet.
  • the terminal may determine the first bandwidth part that has been activated according to the configuration of the network device, and then switch from the first bandwidth part to the first default bandwidth part, thereby implementing the rollback of the bandwidth part.
  • the first default bandwidth part is a downlink bandwidth part and belongs to the first bandwidth part grouping.
  • the switching of the bandwidth part may also be referred to as the fallback of the bandwidth part, which specifically refers to deactivating the activated bandwidth part and activating the default bandwidth part. Therefore, in the embodiment of the present application, at least one bandwidth part of the activated first bandwidth part is different from the first default bandwidth part.
  • the so-called two bandwidth parts are different, which means the frequency positions of the two bandwidth parts.
  • Bandwidth, and at least one of the parameter sets are different.
  • the communication method in the embodiment of the present application realizes the rollback of the bandwidth part by switching from the activated bandwidth part to the default bandwidth part, which is beneficial to saving terminal energy consumption and improving system performance.
  • the first bandwidth part belongs to a second bandwidth part group.
  • the above-mentioned handover of the bandwidth part can be divided into two cases of cross-group handover and this group handover, which is not limited in this embodiment of the present application.
  • the first bandwidth part may belong to the above-mentioned first bandwidth part group.
  • the first bandwidth part may belong to the second bandwidth part group. In this case, the terminal actually switches from the bandwidth part in the second bandwidth part group to one bandwidth in the first bandwidth part group. section.
  • the default bandwidth portion may be configured only in the main bandwidth portion group, or may be configured in multiple bandwidth portion groups, which is not limited in this embodiment of the present application.
  • the above-mentioned first default bandwidth part packet refers only to the default bandwidth part in the main bandwidth part packet.
  • the network device may configure a default bandwidth section for each bandwidth section packet.
  • the first bandwidth part packet is used to receive a system message, and / or is used for initial access.
  • the downlink bandwidth part in the first bandwidth part packet may include a bandwidth part for receiving system messages, and / or, a bandwidth part for initial access. Therefore, the first bandwidth part packet may also be called Group the main bandwidth portion. If the first bandwidth part belongs to the second bandwidth part packet, the second bandwidth part packet may also be referred to as a slave bandwidth part packet.
  • the terminal switches from the first bandwidth part to the first default bandwidth part, that is, the terminal switches from the bandwidth part in the slave bandwidth part packet to a bandwidth part in the master bandwidth part packet.
  • the switching of the terminal from the first bandwidth portion to a first default bandwidth portion includes: when the first timer expires, the terminal A bandwidth portion is switched to the first default bandwidth portion.
  • the network device may configure a first timer for the terminal and indicate the duration of the first timer.
  • the terminal starts the first timer on the activated first bandwidth part. If the first timer expires (or Timeout), the terminal has not received the downlink control signaling sent by the network device, and the terminal can perform the above switching operation, that is, switching from the first bandwidth portion to the first default bandwidth portion.
  • the network device also maintains the first timer. If the terminal performs a rollback operation, the network device can learn according to the configured first timer, thereby ensuring that the understanding of the network device and the terminal is consistent.
  • the second bandwidth portion group includes a second default bandwidth portion; and the terminal switches from the first bandwidth portion to the first default bandwidth portion, including: The terminal switches 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.
  • the terminal device can implement a two-stage rollback of the activated bandwidth part, that is, first switch from the activated first bandwidth part to the second default bandwidth part, and then switch from the second default bandwidth part to the first default bandwidth part.
  • Bandwidth part It should be understood that the number of the second default bandwidth part may be multiple, and the number of the first default bandwidth part is one.
  • the above-mentioned second bandwidth partial packet may include a first bandwidth partial packet.
  • the configuration of the first default bandwidth part and the second default bandwidth part in the first bandwidth part group may be independent; or, the first default bandwidth part in the first bandwidth part group may be defaultable ,
  • the second default bandwidth part in the first bandwidth part group may be defined as the first default bandwidth part in the first bandwidth part group, that is, the first default bandwidth part and the second default bandwidth part in the first bandwidth part group The same, but it is not limited in the embodiment of the present application.
  • the above-mentioned second bandwidth partial packet may not include the first bandwidth partial packet.
  • the first default bandwidth part in the first bandwidth part packet may be defined as the second default bandwidth part in the first bandwidth part packet, that is, the first default bandwidth part and the second in the first bandwidth part packet.
  • the default bandwidth part is the same, but this embodiment of the present application does not limit this.
  • the switching of the terminal from the first bandwidth portion to the first default bandwidth portion includes: when the duration of the second timer is greater than the first threshold value, all The terminal switches from the first bandwidth portion to the second default bandwidth portion; when the duration of the second timer is greater than a second threshold value, the terminal switches from the second default bandwidth portion to all The first default bandwidth section is described.
  • the second threshold value is greater than the first threshold value.
  • the network device may configure a timer and two thresholds for the terminal, that is, the foregoing second timer, the first threshold, the second threshold, and the first threshold.
  • the value is less than or equal to the second threshold value.
  • the terminal When the duration of the second timer exceeds the first threshold value, the terminal performs a first-level rollback, that is, switches from the first bandwidth portion to the second default bandwidth portion.
  • the terminal When the duration of the timer exceeds the second threshold value, the terminal performs a second level fallback, that is, switches from the second default bandwidth part to the first default bandwidth part.
  • the switching of the terminal from the first bandwidth portion to the second default bandwidth portion includes: when the third timer expires, the terminal Switching the first bandwidth portion to the second default bandwidth portion; and switching the terminal from the second default bandwidth portion to the first default bandwidth portion includes: when the fourth timer expires, the terminal Switching from the second default bandwidth portion to the first default bandwidth portion.
  • the duration of the fourth timer is greater than the duration of the third timer.
  • the network device may configure two timers and the duration of the two timers for the terminal, that is, the third timer and the fourth timer described above, and the duration of the third timer is less than or It is equal to the duration of the fourth timer.
  • the terminal performs the first level rollback, that is, switches from the first bandwidth portion to the second default bandwidth portion.
  • the terminal executes The second level of fallback is to switch from the second default bandwidth portion to the first default bandwidth portion.
  • another communication method including: a network device determines a plurality of bandwidth part packets, and a first bandwidth part packet of the plurality of bandwidth part packets includes a first default bandwidth part and the first bandwidth part The packet is used to receive system messages and / or used for initial access; the network device configures the terminal with the first default bandwidth portion.
  • the network device may determine a plurality of bandwidth part packets, and the first bandwidth part packet in the plurality of bandwidth part packets includes a first default bandwidth part, and the first default bandwidth part may be used by the terminal for fallback.
  • the above-mentioned first bandwidth part packet is used for receiving system messages, and / or for initial access.
  • the above-mentioned first bandwidth part packet may include a bandwidth part for receiving system messages 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 the above three. Both include, this embodiment is not limited in this regard.
  • the first bandwidth partial packet may also be referred to as a main bandwidth partial packet.
  • multiple bandwidth part groupings are determined by a network device, and a first default bandwidth part is configured for the terminal based on the multiple bandwidth part groupings, so that the terminal can perform multiple bandwidth part return according to the configuration of the network device Backing out, that is, switching from the activated multiple bandwidth parts to the first default bandwidth part, is conducive to saving energy consumption of the terminal device and improving system performance.
  • the method further includes: the network device selecting a downlink bandwidth portion from the first bandwidth portion packet as the first default bandwidth portion.
  • the network device may first determine the first bandwidth partial grouping, configure the terminal with the first bandwidth partial grouping, and then select one from the first bandwidth partial grouping.
  • the downlink bandwidth part is used as the first default bandwidth part, that is, the first default bandwidth part is selected from the main bandwidth part group, and then the first default bandwidth part is notified to the terminal through signaling.
  • the method further includes: the network device selects a downlink bandwidth portion from the configured bandwidth portion as the first default bandwidth portion; the network device determines The plurality of bandwidth part groupings includes: determining, by the network device, a bandwidth part group to which the first default bandwidth part belongs as the first bandwidth part grouping.
  • the network device may first select a first default bandwidth part, and an optional set of the first default bandwidth part is at least one configured bandwidth part. Then, the network The device may determine the bandwidth part packet in which the first default bandwidth part is located as a first bandwidth part packet, and the first bandwidth part packet is a main bandwidth part packet.
  • the default bandwidth part can be configured only in the main bandwidth part group through the protocol.
  • the terminal can determine the first default bandwidth part according to the configuration of the network device, so that the first bandwidth part to which the first default bandwidth part belongs. The packet is determined as the main bandwidth part packet.
  • the method further includes: configuring, by the network device, a second default bandwidth part for the terminal, and the second bandwidth part grouping among the multiple bandwidth part groupings includes The second default bandwidth portion.
  • the network device may also be configured with a second default bandwidth part, so that the terminal can perform two-stage fallback, that is, return from the activated multiple first bandwidth parts. Fall back to the second default bandwidth part, and then fall back from the second default bandwidth part to the first default bandwidth part.
  • the optional set of the second default bandwidth part is a grouping of the configured bandwidth parts.
  • the configured bandwidth part group includes bandwidth part group 1 and bandwidth part group 2. If the network device needs to configure a second default bandwidth part for the bandwidth part group 2, the network device can use the bandwidth included in the bandwidth part group 2 In the section, a downlink bandwidth section is selected as the second default bandwidth section of the bandwidth section packet 2.
  • the number of the second default bandwidth part may be one or multiple, and the second default bandwidth part belongs to the second bandwidth part group among the multiple bandwidth part groups.
  • Each second bandwidth partial packet in the partial packet includes a second default bandwidth portion, where B is less than or equal to A.
  • there are five second bandwidth part groupings and each of the three second bandwidth part groupings has its own second default bandwidth part.
  • there are five second bandwidth part packets and each of the five second bandwidth part packets has a respective second default bandwidth part.
  • a second bandwidth part packet including the second default bandwidth part is used to receive a system message, and / or, used for initial access.
  • a second bandwidth part group of the multiple bandwidth part packets includes an activated first bandwidth part.
  • an apparatus which includes a unit for performing any one of the first to second aspects described above and each step in an implementation thereof.
  • the device is a communication chip
  • the communication chip may include an input circuit or interface for transmitting information or data, and an output circuit or interface for receiving information or data.
  • the device is a terminal, and the terminal may include a transmitter for transmitting information or data, and a receiver for receiving information or data.
  • the apparatus is a network device, and the network device may include a transmitter for sending information or data, and a receiver for receiving information or data.
  • an apparatus including a processor and a memory, where the memory is configured to store a computer program, and the processor is configured to call and run the computer program from the memory, so that the apparatus executes the first aspect to the second aspect. Any of the aspects and methods in its implementation.
  • processors there are one or more processors, and one or more memories.
  • the memory may be integrated with the processor, or the memory is separately provided from the processor.
  • the communication device further includes a transmitter (transmitter) and a receiver (receiver).
  • a computer program product includes a computer program (also referred to as a code or an instruction), and when the computer program is executed, the computer executes the first aspect to the first aspect.
  • the method in either of the two possible implementations.
  • a computer-readable medium stores a computer program (also referred to as code, or instructions), which when executed on a computer, causes the computer to execute the first aspect to the first aspect.
  • a computer program also referred to as code, or instructions
  • the method in either of the two possible implementations.
  • a chip system which includes a memory and a processor.
  • the memory is used to store a computer program, and the processor is used to call and run the computer program from the memory, so that the communication device installed with the chip system executes the foregoing.
  • the method in any one of the first aspect to the second aspect may be implemented.
  • the chip system may include an input circuit or interface for sending information or data, and an output circuit or interface for receiving information or data.
  • 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 flowchart of another communication method according to an embodiment of the present application.
  • FIG. 4 is an exemplary block diagram of a device according to an embodiment of the present application.
  • FIG. 5 is an exemplary block diagram of another device 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.
  • GSM global mobile communication
  • CDMA code division multiple access
  • WCDMA broadband code division multiple access
  • GPRS general packet radio service
  • LTE long term evolution
  • FDD frequency division duplex
  • TDD Time Division Duplex
  • UMTS Universal Mobile Telecommunications System
  • WiMAX Worldwide Interoperability for Microwave Access
  • 5G 5th Generation
  • NR new radio
  • the terminal in the embodiment of the present application may refer to user equipment (UE), terminal equipment, access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal , Wireless communication equipment, user agent, or user device.
  • the terminal can also be a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital processing (PDA), and a wireless communication function.
  • the network device in the embodiment of the present application may be a device for communicating with a terminal.
  • the network device may be a Global System (GSM) system or a Code Division Multiple Access (CDMA) system.
  • Base station (BTS) can also be a base station (nodeB, NB) in a wideband code division multiple access (WCDMA) system, or an evolutionary base station (evolutional nodeB) in an LTE system , ENB, or eNodeB), or a wireless controller in a cloud radio access network (CRAN) scenario, or the network device may be a relay station, an access point, an in-vehicle device, a wearable device, and a 5G network
  • the network equipment in the future or the network equipment in a PLMN network to be evolved in the future is not limited in the embodiments of the present application.
  • BWP Bandwidth part
  • the two-step resource allocation method is discussed and supported for data transmission between network equipment and terminals. That is, the network equipment first allocates a bandwidth portion to the terminal, and then allocates resources to the terminal in this bandwidth portion. Resources transfer data.
  • transmission can refer to both uplink transmission and downlink reception.
  • bandwidth part may also be referred to as a carrier bandwidth part, and other names may also be adopted, which is not limited in the embodiment of the present application.
  • the cell may be a serving cell of the terminal.
  • the serving cell is described by a high level from the perspective of resource management or mobility management or service unit.
  • the coverage of each network device can be divided into one or more serving cells, and the serving cell can be considered to be composed of certain frequency domain resources, that is, a serving cell can include one or more carriers.
  • the concept of a carrier is described from the perspective of signal generation at the physical layer.
  • a carrier is defined by one or more frequency points and corresponds to a continuous or discontinuous frequency spectrum, and is used to carry communication data between network equipment and terminals.
  • the downlink carrier can be used for downlink transmission, and the uplink carrier can be used for uplink transmission.
  • multiple uplink bandwidth parts can be configured on one uplink carrier, and multiple downlink bandwidth parts can be configured on one downlink carrier.
  • the part in which the network device allocates bandwidth to the terminal may be applied to any one or any combination of the following three scenarios.
  • the system service volume increases significantly. Therefore, in the existing communication system, a system bandwidth design is proposed to provide a large bandwidth to provide more system resources. Can provide higher data transfer rates.
  • the bandwidth supported by the terminal may be smaller than the system bandwidth. Among them, the larger the bandwidth supported by the terminal, the stronger the processing capability of the terminal, the higher the data transmission rate of the terminal, and the higher the design cost of the terminal.
  • the bandwidth supported by the terminal can also be referred to as the bandwidth capability of the terminal.
  • the maximum system bandwidth may be 400 MHz, and the bandwidth capability of the terminal may be 20 MHz, 50 MHz, or 100 MHz.
  • the bandwidth capabilities of different terminals may be the same or different, and this embodiment of the present application does not limit this.
  • the network device can configure a bandwidth portion for the terminal from the system frequency resource, and the bandwidth of the bandwidth portion is less than or equal to the bandwidth capability of the terminal.
  • 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.
  • the parameter set is a parameter used by the communication system.
  • Communication systems (such as 5G) can support multiple parameter sets.
  • the parameter set can be defined by one or more of the following parameter information: subcarrier interval, cyclic prefix (CP), time unit, bandwidth, etc.
  • CP cyclic prefix
  • parameter sets can be set independently.
  • a network device may configure multiple bandwidth sections in a system frequency resource, and independently configure a parameter set for each of the multiple bandwidth sections to support multiple services in the system frequency resource Type and / or communication scenario.
  • the parameter sets of different bandwidth parts may be the same or different, which is not limited in this application.
  • the network device may determine a parameter set A for communication based on a service type and / or a communication scenario corresponding to the communication, so that a corresponding bandwidth part may be configured for the terminal based on the parameter set A.
  • the parameter set of the corresponding bandwidth part is configured as a parameter set A.
  • 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.
  • the network device can configure the bandwidth portion of the terminal based on the traffic of the terminal to save power consumption of the terminal.
  • the terminal can receive control information only in a small bandwidth portion, which can reduce the amount of radio frequency processing tasks and the amount of baseband processing tasks of the terminal, thereby reducing the power consumption of the terminal.
  • the network device can configure the terminal with a smaller bandwidth portion, which can reduce the amount of radio frequency processing tasks and the amount of baseband processing tasks of the terminal, thereby reducing the power consumption of the terminal.
  • the network device can configure a larger bandwidth portion for the terminal, thereby providing a higher data transmission rate.
  • 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.
  • the bandwidth part may be a downlink bandwidth part, which is used for the downlink reception of the terminal. At this time, the bandwidth of the bandwidth part does not exceed the receiving bandwidth capability of the terminal; the bandwidth part may also be an uplink bandwidth part, which is used for the uplink sending by the terminal. At this time, the bandwidth of the bandwidth part does not exceed the transmission bandwidth capability of the terminal.
  • the network device can configure multiple bandwidth parts for the terminal, and the bandwidth part includes both the uplink bandwidth part and the downlink bandwidth part.
  • the uplink bandwidth part and the downlink bandwidth part are independently configured, including independently configuring their frequency positions, bandwidths, and parameter sets.
  • the terminal performs data transmission based on the active bandwidth part of 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 characteristic can also be referred to as a self-contained transmission.
  • 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).
  • SUL supplementary uplink carrier
  • an uplink bandwidth portion may be additionally activated.
  • TDD time division duplex
  • the active uplink bandwidth part and the downlink bandwidth part are center-aligned (the uplink bandwidth part on the SUL is not required to be aligned with the downlink bandwidth part).
  • TDD time division duplex
  • the following concept of grouping bandwidth portions is proposed. Taking at least one activated bandwidth part included in each bandwidth part group as a whole, the terminal can simultaneously use multiple bandwidth parts to transmit data, and the system has high compatibility and simple implementation.
  • the network device can divide the bandwidth part configured for the same service of the terminal into a bandwidth part packet. For example, one bandwidth part packet is used to transmit enhanced mobile broadband (eMBB) services, and another bandwidth part packet is used to transmit ultra-high bandwidth High-reliability ultra-low latency communication (URLLC) service; or, one bandwidth part packet is used for access link, and another bandwidth part packet is used for return link; or one bandwidth part packet is used for The link between the network equipment and the terminal, and another bandwidth portion is used for the link between the terminal and the terminal.
  • eMBB enhanced mobile broadband
  • URLLC ultra-high bandwidth High-reliability ultra-low latency communication
  • one bandwidth part packet is used for access link, and another bandwidth part packet is used for return link
  • one bandwidth part packet is used for The link between the network equipment and the terminal, and another bandwidth portion is used for the link between the terminal and the terminal.
  • the network equipment may have other division criteria, which is not limited in this application.
  • the N bandwidth sections configured for the terminal may be configured or represented as G bandwidth section packets, and the i th bandwidth section packet in the G bandwidth section packets includes N i, UL uplink bandwidth sections and N i, DL downlink bandwidth parts.
  • the numbers of the above N i, UL uplink bandwidth parts and N i, DL downlink bandwidth parts may be the same or different in the i-th bandwidth part grouping.
  • the N bandwidth sections configured for the terminal can be configured or represented as G bandwidth section packets, and the i th bandwidth section packet in the G bandwidth section packets is composed of N i, UL uplink bandwidth sections, that is, the first The i bandwidth part is grouped as an uplink bandwidth part packet; or, the i th bandwidth part group of the G bandwidth part packets is composed of N i, DL downlink bandwidth parts, that is, the i th bandwidth part is grouped as a downlink bandwidth part. Grouping.
  • the uplink bandwidth part packet can be paired with or correspond to the downlink bandwidth part packet, which is called bandwidth part packet pairing.
  • bandwidth part packet pairing is to support the uplink transmission and downlink feedback of the terminal.
  • the number of bandwidth partial packets in the bandwidth partial packet pairing is at least two.
  • the bandwidth partial packet may refer to either the bandwidth partial packet in the first bandwidth partial packet scheme or the uplink bandwidth partial packet and / or the downlink bandwidth partial packet in the second bandwidth partial packet.
  • the terminal has two possible transmission modes, namely a frequency division multiplexing (FDM) mode and a time division multiplexing (TDM) mode.
  • FDM frequency division multiplexing
  • TDM time division multiplexing
  • the terminal can use these activated bandwidth parts to transmit data in parallel. For example, one bandwidth part packet is used to transmit eMBB services, and the other bandwidth part packet is used to transmit URLLC services; or, one bandwidth part packet is used to receive data. For the inbound link, another bandwidth part packet is used for the backhaul link; or, 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.
  • QoS quality of service
  • the terminal uses only the bandwidth portion of one of the multiple bandwidth portion packets for data transmission at a given time, but by activating multiple bandwidth portions belonging to different bandwidth portion packets, the terminal can not increase the parallelism. While processing power, it can quickly respond to different services (for example, zero-latency switching between bandwidth parts).
  • bandwidth part packet if at least one bandwidth part of a bandwidth part packet is in an activated state, the bandwidth part packet is considered to be in an activated state, and if all bandwidth parts in a bandwidth part packet are in a deactivated state, then The bandwidth portion is considered to be in a deactivated state.
  • deactivation can be understood as no data transmission, but the bandwidth portion can still be activated when no data transmission is performed.
  • a terminal uses only a bandwidth portion of a plurality of bandwidth portion packets for data transmission at a given time.
  • the terminal needs to blindly detect the downlink control channel on the activated downlink bandwidth portion, rather than blindly detect the downlink control channel on the deactivated downlink bandwidth portion.
  • the terminal may not blindly detect the downlink control on the activated downlink bandwidth portion Channels, for example, where packet scheduling across the bandwidth is supported.
  • the cross-bandwidth partial packet scheduling and self-contained scheduling of the bandwidth partial packet are explained in detail below.
  • the bandwidth partial packet may have the characteristics of self-contained transmission.
  • the so-called self-contained transmission refers to the granularity activation / deactivation of the bandwidth portion through downlink control signaling, or the granularity activation / deactivation of the bandwidth portion through downlink control signaling, that is, 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.
  • 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.
  • the downlink is carried.
  • the bandwidth portion of the control signaling and the bandwidth portion indicated by the downlink control signaling belong to the paired downlink bandwidth portion packet and the uplink bandwidth portion packet, respectively.
  • the bandwidth partial packet can also support the characteristics of scheduling across the bandwidth partial packet.
  • the so-called cross-bandwidth partial packet scheduling means that when data scheduling is performed through downlink control signaling, for the first bandwidth partial grouping scheme, the bandwidth portion carrying the downlink control signaling and the bandwidth portion indicated by the downlink control signaling belong to different bandwidths.
  • Partial grouping for the second bandwidth partial grouping scheme, when the bandwidth portion indicated by the downlink control signaling is the downlink bandwidth portion, the bandwidth portion carrying the downlink control signaling and the bandwidth portion indicated by the downlink control signaling belong to different downlinks The bandwidth part is grouped.
  • the downlink bandwidth part packet that belongs to the bandwidth part carrying the downlink control signaling and the bandwidth part indicated by the downlink control signaling belong to the uplink bandwidth part.
  • the initial access bandwidth part includes an initial access downlink bandwidth part and an initial access uplink bandwidth part, which are used by the terminal to perform initial access and establish a connection with a network device.
  • the initial access downstream bandwidth part is determined through the master message block (master information block (MIB) notification).
  • MIB master information block
  • the terminal finds a synchronization signal block by blindly detecting the synchronization signal grid, and the information carried in the MIB in the synchronization signal block includes between the lowest position in the frequency domain of the initial access downlink bandwidth part and the lowest position in the frequency domain of the synchronization signal block.
  • the bandwidth of the initial access downlink bandwidth portion the terminal determines the initial access downlink bandwidth portion according to the MIB.
  • the terminal receives the first system information (system information block 1, SIB 1), random access response (RAR), and message 4 (Message 4) in the initial access downlink bandwidth portion, and the scheduling information of these messages make.
  • SIB 1 system information block 1
  • RAR random access response
  • Message 4 message 4
  • the frequency domain position and bandwidth of the initial access downlink carrier bandwidth portion may be defined to be the same as the frequency domain position and bandwidth of the control channel resource set (CORESET) of the scheduling SIB1.
  • the MIB may notify the offset between the lowest position in the frequency domain of the CORESET and the lowest position in the frequency domain of the synchronization signal block, and the bandwidth of the CORESET, indirectly indicating the initial access to the downlink carrier bandwidth portion.
  • the uplink bandwidth part of the initial access is determined through the SIB notification.
  • the message carried in SIB 1 includes the first frequency offset (offset1) of the reference point A (reference point A) relative to the reference frequency position (for example, the lowest subcarrier of the lowest RB of the synchronization signal block), the uplink virtual Carrier start resource block (resource block, RB) relative to the second frequency offset (offset2) of reference point A, the initial access to the uplink bandwidth part of the start RB relative to the uplink virtual carrier start RB third frequency offset (offset3), and the bandwidth of the initial access uplink bandwidth portion.
  • the public RB index can be defined based on the reference point A.
  • the public RBs are numbered in a direction of increasing frequency from the public RB 0, and the center of the lowest subcarrier of the public RB 0 is the reference point A.
  • the terminal sends a physical random access channel (PRACH) and a message 3 (Message 3) in the initial access uplink bandwidth part.
  • PRACH physical random access channel
  • Message 3 message 3
  • the initial access bandwidth part may be included in the main bandwidth part group, or may not be included in any bandwidth part group, which is not limited in the embodiment of the present application.
  • the following first introduces the concept of the main bandwidth part grouping, and then explains the relationship between the main bandwidth part grouping and the initial access bandwidth part in detail.
  • 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.
  • the main bandwidth part packet includes a bandwidth part for receiving system messages
  • the main bandwidth part packet is used for the terminal to receive the system message, in other words, the terminal receives the system message (including the DCI for scheduling the system message) in the main bandwidth part packet.
  • the terminal can receive system messages on any active portion of the bandwidth.
  • the terminal will receive a system message.
  • the terminal needs Blind detection of multiple DCIs used for scheduling system messages will increase the number of blind detections of the terminal, thereby increasing the energy consumption of the terminal.
  • the behavior of the terminal can be limited, that is, in a scenario with multiple active bandwidths, the terminal only needs to receive one system message.
  • the bandwidth part defined for receiving the system message is an active downlink bandwidth part in the main bandwidth part packet.
  • This article refers to the non-master bandwidth part grouping as the slave bandwidth part grouping, but it should be understood that the master bandwidth part grouping and the slave bandwidth part grouping are merely exemplary names used for convenience of description, and other names may also be adopted. limited.
  • the main bandwidth partial grouping is the bandwidth partial grouping currently used for data transmission
  • the main bandwidth partial grouping is currently used for the downlink.
  • the main bandwidth part grouping includes the part for initial access bandwidth
  • the initial access bandwidth part is included in the main bandwidth part group. Therefore, the bandwidth part can be divided according to the position of the initial access bandwidth part, thereby determining the main bandwidth part group.
  • the network device can configure the main bandwidth partial grouping according to both implicit and explicit cases.
  • the terminal may determine whether the bandwidth part grouping is the main bandwidth part grouping based on whether the bandwidth part grouping includes the initial access downlink bandwidth part when configuring the bandwidth part grouping. If the bandwidth part packet includes the initial access downlink bandwidth part, the bandwidth part group is a main bandwidth part packet; otherwise, the bandwidth part packet is not a main bandwidth part packet.
  • the network device and the terminal may associate the initial access bandwidth part with the main bandwidth part group.
  • the initial access bandwidth part is bandwidth part 0, and the network device is configured with three additional bandwidth parts, namely, bandwidth part 1, bandwidth part 2, and bandwidth part 3.
  • the network device is configured with two bandwidth part groups, where bandwidth part group 1 includes bandwidth part 1, bandwidth part group 2 includes bandwidth part 2 and bandwidth part 3, and the network device is configured with bandwidth part group 1 as the main bandwidth part group.
  • the bandwidth part group 1 also includes an initial access downlink bandwidth part, that is, the bandwidth part group 1 includes a bandwidth part 0 and a bandwidth part 1, and the bandwidth part group 2 includes a bandwidth part 2 and a bandwidth part 3.
  • the initial access bandwidth part is bandwidth part 0, and the network device is configured with four additional bandwidth parts, namely bandwidth part 1, bandwidth part 2, bandwidth part 3, and bandwidth part 4.
  • the network device is configured with two bandwidth part groups, of which the bandwidth part 1 and the bandwidth part 2 included in the bandwidth part group 1, the bandwidth part group 2 includes the bandwidth part 3 and the bandwidth part 4, and the network device is configured with the bandwidth part group 1 as
  • the main bandwidth part is grouped, and the bandwidth part group 1 also includes the initial access downlink bandwidth part, that is, the bandwidth part group 1 includes bandwidth part 0, bandwidth part 1, and bandwidth part 2, and the bandwidth part group 2 includes bandwidth part 3 and bandwidth part 4. .
  • configuring the initial access downlink bandwidth portion in a downlink bandwidth portion packet is beneficial to guaranteeing the characteristics of the bandwidth portion packet self-contained transmission, especially when the terminal is configured with only one (downlink) bandwidth portion packet.
  • the initial access downlink bandwidth part needs to be configured in a downlink bandwidth part group.
  • the bandwidth partial packet may also be defaulted as the main bandwidth partial packet.
  • the bandwidth part grouping where the initial access bandwidth part is located is the main bandwidth part grouping, which is beneficial to saving the overhead of sending system messages on the network device side.
  • One possible application scenario is the FDM mode, where the terminal uses these activated bandwidth portions to transmit data in parallel. Because the network device will definitely send system messages on the initial access downlink bandwidth part, that is, the bandwidth part grouping of the initial access downlink bandwidth part must include system messages. Defining the bandwidth part grouping as the main bandwidth part grouping allows the network device It is not necessary to send system messages in other bandwidth partial packets, thereby saving the overhead of system messages in the network.
  • the network device needs to indicate the main bandwidth portion of the packet.
  • the limitation may also be modified as follows: the initial access bandwidth part is not in the main bandwidth part group.
  • the initial access bandwidth part is bandwidth part 0, and the network device is additionally configured with 4 bandwidth parts, namely bandwidth part 1, bandwidth part 2, bandwidth part 3, and bandwidth part 4.
  • the network device is configured with two bandwidth part groups, of which the bandwidth part group 1 includes bandwidth part 1 and bandwidth part 2, the bandwidth part group 2 includes bandwidth part 3 and bandwidth part 4, and the network device configuration bandwidth part group 1 is mainly Bandwidth part grouping, the terminal is finally configured with: Bandwidth part grouping 1 which includes bandwidth part 1 and bandwidth part 2, Bandwidth part grouping 2 which includes bandwidth part 3 and bandwidth part 4, and independent of any bandwidth part grouping.
  • the initial access bandwidth part is the bandwidth part 0.
  • the terminal uses only one bandwidth part packet of multiple bandwidth part packets for data transmission at a given moment.
  • the main bandwidth part group is the bandwidth part currently used for data transmission. Grouping.
  • the main bandwidth partial grouping is the downlink bandwidth partial grouping currently used for downlink data transmission, or the downlink bandwidth partial grouping corresponding to the uplink bandwidth partial grouping currently used for uplink data transmission.
  • the terminal can quickly respond to different services without increasing the parallel processing capability, and it also helps to ensure the characteristics of the main bandwidth part of the packet's self-contained transmission.
  • the terminal can blindly detect the downlink control information only in the main bandwidth part of the packet.
  • the relationship between the initial access bandwidth part and the bandwidth part grouping may be determined according to different situations, that is, the above situation (2) or situation (3) is adopted.
  • the initial access bandwidth section is grouped in the main bandwidth section, which is the case (2) above; when the number of additional configured bandwidth sections of the network device is greater than or When it is equal to N, the initial access bandwidth part may not be included in any of the bandwidth part packets, which is the case (3) above.
  • the initial access bandwidth part may not be indicated through downlink control information.
  • the initial access bandwidth part may not be in any of the bandwidth part groups, or the initial access bandwidth part is not in the main bandwidth part group; in the FDM mode, the initial access bandwidth part Can be grouped in the main bandwidth section.
  • FIG. 1 is a schematic diagram of a communication system 100 applicable to an embodiment of the present application.
  • the communication system 100 includes at least two communication devices, for example, a network device 110 and a terminal 120, wherein the network device 110 and the terminal 120 can perform data communication through a wireless connection.
  • this application provides a communication method, which can implement the rollback of the activated bandwidth part, thereby saving the energy consumption of the terminal device.
  • the communication method provided in the present application is described in detail below with reference to FIGS. 2 to 3.
  • FIG. 2 is an exemplary flowchart 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 terminal among the terminals shown in FIG. 1.
  • the terminal determines that the first bandwidth part is activated.
  • the terminal switches from the first bandwidth portion to a first default bandwidth portion, where the first default bandwidth portion is a downlink bandwidth portion in a first bandwidth portion packet.
  • the terminal may determine the first bandwidth part that has been activated according to the configuration of the network device, and then switch from the first bandwidth part to the first default bandwidth part, thereby implementing the rollback of the bandwidth part.
  • the first default bandwidth part is a downlink bandwidth part and belongs to the first bandwidth part grouping.
  • the switching of the bandwidth part may also be referred to as the fallback of the bandwidth part, which specifically refers to deactivating the activated bandwidth part and activating the default bandwidth part. Therefore, in the embodiment of the present application, at least one of the activated first bandwidth portions and the above-mentioned first default bandwidth portion are different.
  • the so-called two bandwidth portions are different, which means that the two bandwidth portions are different.
  • At least one of the frequency position, the bandwidth, and the parameter set is different.
  • the communication method in the embodiment of the present application realizes the rollback of the bandwidth part by switching from the activated bandwidth part to the default bandwidth part, which is beneficial to saving terminal energy consumption and improving system performance.
  • the above-mentioned handover of the bandwidth part can be divided into two cases of cross-group handover and this group handover, which is not limited in this embodiment of the present application.
  • the first bandwidth part may belong to the above-mentioned first bandwidth part group.
  • the first bandwidth part may belong to the second bandwidth part group. In this case, the terminal actually switches from the bandwidth part in the second bandwidth part group to one bandwidth in the first bandwidth part group. section.
  • the default bandwidth portion may be configured only in the main bandwidth portion group, or may be configured in multiple bandwidth portion groups, which is not limited in this embodiment of the present application.
  • the above-mentioned first default bandwidth part packet refers only to the default bandwidth part in the main bandwidth part packet.
  • the network device may configure a default bandwidth section for each bandwidth section packet.
  • the first bandwidth part packet is used to receive a system message, and / or is used for initial access.
  • the downlink bandwidth part in the first bandwidth part packet may include a bandwidth part for receiving system messages, and / or, a bandwidth part for initial access. Therefore, the first bandwidth part packet may also be called Group the main bandwidth portion. If the first bandwidth part belongs to the second bandwidth part packet, the second bandwidth part packet may also be referred to as a slave bandwidth part packet.
  • the terminal switches from the first bandwidth part to the first default bandwidth part, that is, the terminal switches from the bandwidth part in the slave bandwidth part packet to a bandwidth part in the master bandwidth part packet.
  • the network device can be configured with three specific implementation manners, which will be described in detail corresponding to the three cases below.
  • 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.
  • the first bandwidth part group includes a first default bandwidth part.
  • the first bandwidth part group is a main bandwidth part group; the terminal may directly fall back from the activated first bandwidth part to the main bandwidth part group.
  • the network device may configure the first default bandwidth part for the terminal in an explicit or implicit manner, which is not limited in the embodiment of the present application.
  • the network device may first determine the first bandwidth partial packet, configure the terminal with the first bandwidth partial packet, and then select a downlink bandwidth portion from the first bandwidth partial packet as The first default bandwidth part, that is, the first default bandwidth part is selected from the main bandwidth part group, and then the first default bandwidth part is notified to the terminal through signaling.
  • the network device may first select the first default bandwidth portion, and then determine the bandwidth portion grouping in which the first default bandwidth portion is located as the first bandwidth portion grouping, the first bandwidth Partial packet is the main bandwidth part packet.
  • the default bandwidth part can be configured only in the main bandwidth part group through the protocol.
  • the terminal can determine the first default bandwidth part according to the configuration of the network device, so that the first bandwidth part to which the first default bandwidth part belongs.
  • the packet is determined as the main bandwidth part packet.
  • a typical application scenario of this configuration method is that when the initial access bandwidth part does not belong to any group of bandwidth parts, the main bandwidth part group can be determined by this configuration method. Before the main bandwidth part packet is dynamically switched, the terminal needs to know in which bandwidth part packet the first transmission is.
  • the terminal may maintain only one timer (ie, the first timer described below) for bandwidth fallback.
  • the switching of the terminal from the first bandwidth part to the first default bandwidth part includes: when the first timer expires, the terminal switches from the first bandwidth part to all The first default bandwidth section is described.
  • the network device may configure a first timer for the terminal and indicate the duration of the first timer.
  • the terminal starts the first timer on the activated first bandwidth part. If the first timer expires (or Timeout), the terminal has not received the downlink control signaling sent by the network device, and the terminal can perform the above switching operation, that is, switching from the first bandwidth portion to the first default bandwidth portion.
  • the network device also maintains the first timer. If the terminal performs a rollback operation, the network device can learn according to the configured first timer, thereby ensuring that the understanding of the network device and the terminal is consistent.
  • the first default bandwidth portion only in the main bandwidth portion group is beneficial to the terminal to save energy more effectively.
  • One of the requirements for the activated bandwidth part is to use these activated carrier bandwidth parts to transmit data in parallel.
  • the quality of service (QoS) requirement that needs to be met is (overall or average) transmission rate / throughput.
  • the QoS requirement that needs to be met is the energy consumption of the terminal. Therefore, when the terminal enters the energy-saving state, if the active bandwidth part is still maintained, it is not conducive to this QoS requirement.
  • the terminal when the terminal saves energy, it is necessary to deactivate grouping from the carrier bandwidth portion.
  • the terminal When packetizing from the carrier bandwidth part for services such as URLLC, if there is a burst URLLC service arriving, the terminal needs to activate the slave carrier bandwidth part before data transmission. This may cause unnecessary delay (especially when only supporting semi-static carrier bandwidth partial packet activation / deactivation), which seriously affects URLLC's low-latency QoS requirements. Therefore, in this scenario, the following case two can be adopted.
  • the terminal may switch from the activated first bandwidth part to the initial access bandwidth part.
  • the number of the initial access bandwidth part is one, and the initial access bandwidth part may be included in the main bandwidth part group, or may not be included in the main bandwidth part group, or the initial access bandwidth part It is not included in any bandwidth partial grouping, which is not limited in this embodiment of the present application.
  • the second bandwidth part group includes a second default bandwidth part; the terminal may switch from the first bandwidth part to the second default bandwidth part.
  • 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 portion to the second default bandwidth portion.
  • the number of the second default bandwidth part may be multiple.
  • the B second bandwidth part packets in the A second bandwidth part packets may include a second default bandwidth part, and the B second bandwidth parts
  • Each second bandwidth partial packet in the partial packet includes a second default bandwidth portion, where B is less than or equal to A.
  • there are five second bandwidth part groupings and each of the three second bandwidth part groupings has its own second default bandwidth part.
  • there are five second bandwidth part packets, and each of the five second bandwidth part packets has a respective second default bandwidth part.
  • a second default bandwidth part may be configured in each bandwidth part packet in the second bandwidth part packet. This configuration method is beneficial for the terminal to respond quickly to different burst services.
  • the network device and the terminal may maintain only one timer, or may maintain an independent timer corresponding to each second default bandwidth part, which is not limited in this embodiment of the present application.
  • bandwidth part 1 and bandwidth part 2 belong to bandwidth part group 1, and bandwidth part 3 belongs to bandwidth part group 2. Then, the bandwidth part is grouped.
  • the bandwidth part group 2 has a second default bandwidth part, and the terminal can fall back from the bandwidth part 1 and the bandwidth part 2 to the second default bandwidth part in the bandwidth part group 1, from the bandwidth part 3 Fall back to the second default bandwidth part in the bandwidth part packet 2.
  • timer 1 corresponds to the second default bandwidth part in the bandwidth part group 1. If timer 1 expires, only the timer 1
  • the activated bandwidth part in the bandwidth part group 1 is rolled back, that is, the terminal can switch the activated bandwidth part in the bandwidth part group 1 corresponding to the timer 1 to the bandwidth part group 1 corresponding to the timer 1.
  • the second default bandwidth part
  • the network device can also reconfigure the restart conditions of the timer.
  • the terminal specific downlink control signaling It may be an uplink scheduling DCI or a downlink scheduling DCI.
  • the terminal For the second bandwidth partial grouping scheme, if the terminal receives the downlink scheduling DCI in the downlink bandwidth partial packet B, or the terminal receives the uplink scheduling DCI in the uplink bandwidth partial packet C corresponding to the downlink bandwidth partial packet B, then the The terminal restarts only the timer corresponding to the downlink bandwidth part packet B.
  • the terminal may select the first bandwidth part group from which the corresponding second bandwidth part group is not configured with the second A bandwidth part is switched to an initial access bandwidth part.
  • the initial access bandwidth part may be included in the main bandwidth part group, or may not be included in the main bandwidth part group, or the initial access bandwidth part is not included in any bandwidth part group. Examples do not limit this.
  • the terminal may roll back the activated bandwidth part in the bandwidth part packet that is not configured with the second default bandwidth part to the initial access bandwidth part.
  • the terminal may maintain an independent timer for each bandwidth part packet in at least one bandwidth part packet, for a bandwidth part packet that is not configured with a second default bandwidth part, take bandwidth part group 1 as an example, and the bandwidth part After the timer corresponding to packet 1 expires, the terminal may only roll back the activated first bandwidth part in the bandwidth part packet 1 to the initial access bandwidth part.
  • the corresponding timer is the same timer.
  • the first bandwidth part group includes a first default bandwidth part
  • the second bandwidth part group includes a second default bandwidth part
  • the terminal switches from the first bandwidth part to The first default bandwidth portion includes: the terminal switches from the first bandwidth portion to the second default bandwidth portion; and the terminal switches from the second default bandwidth portion to the first default bandwidth portion.
  • the terminal device can implement a two-stage rollback of the activated bandwidth part, that is, first switch from the activated first bandwidth part to the second default bandwidth part, and then switch from the second default bandwidth part to the first default bandwidth part.
  • Bandwidth part It should be understood that the number of the second default bandwidth part may be multiple, and the number of the first default bandwidth part is one.
  • the above-mentioned second bandwidth partial packet may include a first bandwidth partial packet.
  • the configuration of the first default bandwidth part and the second default bandwidth part in the first bandwidth part group may be independent; or, the first default bandwidth part in the first bandwidth part group may be defaultable ,
  • the second default bandwidth part in the first bandwidth part group may be defined as the first default bandwidth part in the first bandwidth part group, that is, the first default bandwidth part and the second default bandwidth part in the first bandwidth part group The same, but it is not limited in the embodiment of the present application.
  • the above-mentioned second bandwidth partial packet may not include the first bandwidth partial packet.
  • the first default bandwidth part in the first bandwidth part packet may be defined as the second default bandwidth part in the first bandwidth part packet, that is, the first default bandwidth part and the second in the first bandwidth part packet.
  • the default bandwidth part is the same, but this embodiment of the present application does not limit this.
  • the first bandwidth part grouping is a main bandwidth part grouping
  • the second bandwidth part grouping includes grouping from a bandwidth part group.
  • the terminal may switch from the activated first bandwidth part to the slave The second default bandwidth part corresponding to the bandwidth part grouping.
  • the terminal can switch from the second default bandwidth part in the secondary bandwidth part group to the first default bandwidth part in the main bandwidth part grouping.
  • switching the terminal from the first bandwidth portion to the first default bandwidth portion includes: when the duration of the second timer is greater than a first threshold value, the terminal A bandwidth portion is switched to the second default bandwidth portion; when the duration of the second timer is greater than a second threshold value, the terminal switches from the second default bandwidth portion to the first default bandwidth portion .
  • the second threshold value is greater than the first threshold value.
  • the network device may configure a timer and two thresholds for the terminal, that is, the foregoing second timer, the first threshold, the second threshold, and the first threshold.
  • the value is less than or equal to the second threshold value.
  • the terminal When the duration of the second timer exceeds the first threshold value, the terminal performs a first-level rollback, that is, switches from the first bandwidth portion to the second default bandwidth portion.
  • the terminal When the duration of the timer exceeds the second threshold value, the terminal performs a second level fallback, that is, switches from the second default bandwidth part to the first default bandwidth part.
  • the switching of the terminal from the first bandwidth portion to the second default bandwidth portion includes: when the third timer expires, the terminal switches from the first bandwidth portion To the second default bandwidth part; switching the terminal from the second default bandwidth part to the first default bandwidth part includes: when the fourth timer expires, the terminal switches from the second default bandwidth The bandwidth portion is switched to the first default bandwidth portion.
  • the duration of the fourth timer is greater than the duration of the third timer.
  • the network device may configure two timers and the duration of the two timers for the terminal, that is, the third timer and the fourth timer described above, and the duration of the third timer is less than or It is equal to the duration of the fourth timer.
  • the terminal performs the first level rollback, that is, switches from the first bandwidth portion to the second default bandwidth portion.
  • the terminal executes The second level of fallback is to switch from the second default bandwidth portion to the first default bandwidth portion.
  • the terminal may perform the above-mentioned two-level rollback operation on the bandwidth part group configured with the second default bandwidth part, and perform the first-level rollback operation for the bandwidth part group configured without the second default bandwidth part. Regardless of whether the first default bandwidth portion is configured, the terminal will eventually fall back to the initial access bandwidth portion.
  • each of the three bandwidth part groups is configured with a second default bandwidth part, and the other two bandwidth part groups are not configured with the first Two default bandwidth sections.
  • the terminal can perform a two-level fallback operation for the three bandwidth part packets, that is, first switch from the first bandwidth part corresponding to the three bandwidth part packets to the second default bandwidth part corresponding to the three bandwidth part packets, and then switch from The three second default bandwidth sections are switched to the initial access bandwidth section.
  • the terminal can perform a level one fallback operation for the other two bandwidth part packets, that is, directly switch from the first bandwidth part corresponding to the other two bandwidth part packets to the initial access bandwidth part.
  • the fallback of the bandwidth part packet configured with the second default bandwidth part and the fallback of the bandwidth part packet not configured with the second default bandwidth part may use the same timer or different timers. Specifically, the bandwidth segment packet that is not configured with the second default bandwidth segment is rolled back (that is, the activated bandwidth segment in the bandwidth segment packet that is not configured with the second default bandwidth segment is switched to the initial access bandwidth segment).
  • the timer can fall back from the first level of the bandwidth part group configured with the second default bandwidth part (that is, switch from the activated bandwidth part in the bandwidth part group configured with the second default bandwidth part to the second default bandwidth part)
  • the timer used is the same, or it can be the same as the timer used in the second level rollback of the bandwidth part grouping configured with the second default bandwidth part (that is, switching from the second default bandwidth part to the initial access bandwidth part)
  • other different timers may also be used for the rollback of the bandwidth part packet that is not configured with the second default bandwidth part, which is not limited in the embodiment of the present application.
  • each bandwidth part grouping in a bandwidth part group corresponding to the first bandwidth part will be configured with a second default bandwidth part, thereby ensuring The terminal may eventually fall back from the activated first bandwidth portion to the first default bandwidth portion.
  • FIG. 3 is an exemplary flowchart of a communication method 300 according to an embodiment of the present application. It should be understood that the network device in the method shown in FIG. 3 may correspond to the network device in the system 100 shown in FIG. 1.
  • the network device determines multiple bandwidth partial packets.
  • a first bandwidth partial packet in the multiple bandwidth partial packets includes a first default bandwidth portion.
  • the first bandwidth partial packet is used to receive a system message, and / or, For initial access;
  • the network device configures the first default bandwidth part for the terminal.
  • the network device may determine a plurality of bandwidth part packets, and the first bandwidth part packet in the plurality of bandwidth part packets includes a first default bandwidth part, and the first default bandwidth part may be used by the terminal for fallback.
  • the above-mentioned first bandwidth part packet is used for receiving system messages, and / or for initial access.
  • the above-mentioned first bandwidth part packet may include a bandwidth part for receiving system messages 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 the above three. Both include, this embodiment is not limited in this regard.
  • the first bandwidth partial packet may also be referred to as a main bandwidth partial packet.
  • multiple bandwidth part groupings are determined by a network device, and a first default bandwidth part is configured for the terminal based on the multiple bandwidth part groupings, so that the terminal can perform multiple bandwidth part returns according to the configuration of the network device.
  • Backing out that is, switching from the activated bandwidth part to the first default bandwidth part, is beneficial to saving energy consumption of the terminal device and improving system performance.
  • the network device may configure the first default bandwidth part for the terminal in various manners, which is not limited in the embodiment of the present application.
  • the method further includes: the network device selecting a downlink bandwidth portion from the first bandwidth portion packet as the first default bandwidth portion.
  • the network device may first determine the first bandwidth partial packet, configure the terminal with the first bandwidth partial packet, and then select a downlink from the first bandwidth partial packet.
  • the bandwidth part is used as the first default bandwidth part, that is, the first default bandwidth part is selected from the main bandwidth part group, and then the first default bandwidth part is notified to the terminal through signaling.
  • the method further includes: the network device selecting a downlink bandwidth portion from the configured bandwidth portion as the first default bandwidth portion; the network device determining a plurality of bandwidth portion groups, The method includes: determining, by the network device, a bandwidth part group to which the first default bandwidth part belongs as the first bandwidth part group.
  • the network device may first select a first default bandwidth portion, and an optional set of the first default bandwidth portion is a configured bandwidth portion, and then the network device may The bandwidth part packet in which the first default bandwidth part is located is determined as a first bandwidth part packet, and the first bandwidth part packet is a main bandwidth part packet.
  • the default bandwidth part can be configured only in the main bandwidth part group through the protocol.
  • the terminal can determine the first default bandwidth part according to the configuration of the network device, so that the first bandwidth part to which the first default bandwidth part belongs. The packet is determined as the main bandwidth part packet.
  • a typical application scenario of this configuration method is that when the initial access bandwidth part does not belong to any group of bandwidth parts, the main bandwidth part group can be determined by this configuration method. Before the main bandwidth part packet is dynamically switched, the terminal needs to know in which bandwidth part packet the first transmission is.
  • the method further includes: configuring, by the network device, a second default bandwidth part for the terminal, and the second bandwidth part grouping among the plurality of bandwidth part groupings includes the second default bandwidth part. section.
  • the network device when the network device is configured with the first default bandwidth part, the network device may also be configured with a second default bandwidth part, so that the terminal performs a two-stage fallback, that is, the fallback from the activated first bandwidth part to The second default bandwidth part, and then fall back from the second default bandwidth part to the first default bandwidth part.
  • the optional set of the second default bandwidth part is a grouping of the configured bandwidth parts.
  • the configured bandwidth part group includes bandwidth part group 1 and bandwidth part group 2. If the network device needs to configure a second default bandwidth part for the bandwidth part group 2, the network device can use the bandwidth included in the bandwidth part group 2 In the section, a downlink bandwidth section is selected as the second default bandwidth section of the bandwidth section packet 2.
  • the number of the second default bandwidth part may be one or multiple, and the second default bandwidth part belongs to at least one second bandwidth part group among the multiple bandwidth part groups.
  • Each second bandwidth partial packet in the partial packet includes a second default bandwidth portion, where B is less than or equal to A.
  • there are five second bandwidth part groupings and each of the three second bandwidth part groupings has its own second default bandwidth part.
  • there are five second bandwidth part packets and each of the five second bandwidth part packets has a respective second default bandwidth part.
  • the second bandwidth part packet including the second default bandwidth part is used for receiving system messages, and / or, used for initial access.
  • a second bandwidth part packet of the multiple bandwidth part packets includes an activated first bandwidth part.
  • the terminal and the network device include a hardware structure and / or a software module corresponding to each function.
  • this application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is performed by hardware or computer software-driven hardware depends on the specific application and design constraints of the technical solution. A professional technician can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.
  • FIG. 4 is a schematic structural diagram of a device 400 provided in the present application.
  • the apparatus 400 includes: a determining unit 410 and a switching unit 420.
  • a determining unit 410 configured to determine an activated first bandwidth part
  • a switching unit 420 configured to switch from the first bandwidth portion to a first default bandwidth portion
  • the first default bandwidth portion is a downlink bandwidth portion in a first bandwidth portion packet
  • the activated first bandwidth portion belongs to a second bandwidth portion packet
  • the first bandwidth portion packet is used by a receiving system Message, and / or, for initial access.
  • the apparatus in the embodiment of the present application realizes the rollback of the bandwidth part by switching from the activated bandwidth part to the default bandwidth part, which is beneficial to saving terminal energy consumption and improving system performance.
  • the second bandwidth part group includes a second default bandwidth part; the switching unit 420 is specifically configured to: switch from the first bandwidth part to the second default bandwidth part; from the second The default bandwidth part is switched to the first default bandwidth part.
  • the switching unit 420 is specifically configured to switch from the first bandwidth portion to the first default bandwidth portion when the first timer expires.
  • the switching unit 420 is specifically configured to: when the duration of the second timer is greater than the first threshold, switch from the first bandwidth portion to the second default bandwidth portion; when the second timer When the duration of the timer is greater than the second threshold value, switching from the second default bandwidth portion to the first default bandwidth portion.
  • the switching unit 420 is specifically configured to: when the third timer expires, switch from the first bandwidth portion to the second default bandwidth portion; when the fourth timer expires, switch from The second default bandwidth part is switched to the first default bandwidth part.
  • the apparatus 400 may be a communication device (for example, a terminal) or a chip in the communication device.
  • the processing unit may be a processor, the sending unit and the receiving unit may be transceivers;
  • the communication device may further include a storage unit, the storage unit may be a memory; and the storage unit is used for storing An instruction, and the processing unit executes the instruction stored in the storage unit, so that the communication device executes the foregoing method.
  • the processing unit may be a processor, the sending unit and the receiving unit may be input / output interfaces, pins or circuits, etc .; the processing unit executes instructions stored in the storage unit,
  • the storage unit may be a storage unit (for example, a register, a cache, etc.) in the chip, or a storage unit (outside the chip) in the communication device ( (E.g., read-only memory, random access memory, etc.)
  • the steps performed by the device 400 and the corresponding beneficial effects can refer to the related description of the terminal in FIG. 2.
  • FIG. 5 is a schematic structural diagram of a device 500 provided in the present application.
  • the apparatus 500 includes: a determining unit 510 and a configuration unit 520.
  • a determining unit 510 configured to determine a plurality of bandwidth part packets, where a first bandwidth part packet in the plurality of bandwidth part packets includes a first default bandwidth part, the first bandwidth part packet is used to receive a system message, and / or For initial access;
  • a configuration unit 520 is configured to configure the first default bandwidth part for a terminal.
  • the apparatus determines a plurality of bandwidth part groups through a network device, and configures a first default bandwidth part for the terminal based on the plurality of bandwidth part groups, so that the terminal can perform rollback of multiple bandwidth parts according to the configuration of the network device. That is, switching from the activated multiple bandwidth portions to the first default bandwidth portion is beneficial to saving energy consumption of the terminal device and improving system performance.
  • the determining unit 510 is further configured to: select a downlink bandwidth part from the first bandwidth part group as the first default bandwidth part.
  • the determining unit 510 is further configured to: select a downlink bandwidth part from the configured bandwidth parts as the first default bandwidth part; and determine a group of bandwidth parts to which the first default bandwidth part belongs as all The first bandwidth part is grouped.
  • the configuration unit 520 is further configured to configure a second default bandwidth part for the terminal, and the second bandwidth part group of the multiple bandwidth part groups includes the second default bandwidth part.
  • a second bandwidth portion packet including the second default bandwidth portion is used to receive a system message, and / or, is used for initial access.
  • a second bandwidth part packet of the plurality of bandwidth part packets includes an activated first bandwidth part.
  • the apparatus 500 may be a communication device (for example, a network device) or a chip in the communication device.
  • the processing unit may be a processor, the sending unit and the receiving unit may be transceivers; the communication device may further include a storage unit, the storage unit may be a memory; and the storage unit is used for storing An instruction, and the processing unit executes the instruction stored in the storage unit, so that the communication device executes the foregoing method.
  • the processing unit may be a processor, the sending unit and the receiving unit may be input / output interfaces, pins or circuits, etc .; the processing unit executes instructions stored in the storage unit,
  • the storage unit may be a storage unit (for example, a register, a cache, etc.) in the chip, or a storage unit located outside the chip in the communication device. (E.g., read-only memory, random access memory, etc.)
  • 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.
  • the above communication device may be a chip, and the processing unit may be implemented by hardware or software.
  • the processing unit When implemented by hardware, the processing unit may be a logic circuit, an integrated circuit, etc .; when implemented by software, the processing unit It may be a general-purpose processor, which is implemented by reading software codes stored in a storage unit, which may be integrated in the processor, or may be located outside the processor and exist independently.
  • the device provided in this application is further described below by using the above device as a terminal or a network device as an example.
  • FIG. 6 is a schematic structural diagram of a terminal 10 provided by the present application. For convenience of explanation, FIG. 6 shows only the 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 used to process the communication protocol and communication data, and control the entire terminal, execute a software program, and process the data of the software program, for example, to support the terminal to execute the resource allocation method or the communication method described in the embodiment action.
  • the memory is mainly used for storing software programs and data.
  • the control circuit is mainly used for conversion of baseband signals and radio frequency signals and processing of radio frequency signals.
  • the control circuit and the antenna can also be called a transceiver, which is mainly used to send and receive radio frequency signals in the form of electromagnetic waves.
  • Input / output devices such as a touch screen, a display screen, and a keyboard, are mainly used to receive data input by the user and output data to the user.
  • the processor can read the software program in the storage unit, interpret and execute the instructions of the software program, and process the data of the software program.
  • the processor performs baseband processing on the data to be sent, and then outputs the baseband signal to the radio frequency circuit.
  • the radio frequency circuit processes the baseband signal, the radio frequency signal is sent out in the form of electromagnetic waves through the antenna.
  • the RF circuit receives the RF signal through the antenna, converts the RF signal into a baseband signal, and outputs the baseband signal to the processor.
  • the processor converts the baseband signal into data and processes the data.
  • FIG. 6 shows only one memory and a processor. 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, which is not limited in the embodiment of the present application.
  • the processor may include a baseband processor and a central processor.
  • the baseband processor is mainly used to process communication protocols and communication data
  • the central processor is mainly used to control the entire terminal and execute software. Programs that process data from software programs.
  • the processor in FIG. 6 integrates the functions of the baseband processor and the central processing unit.
  • the baseband processor and the central processing unit may also be independent processors, which are interconnected through technologies such as a bus.
  • the terminal may include multiple baseband processors to adapt to different network standards, the terminal may include multiple central processors to enhance its processing capabilities, and various components of the terminal may be connected through various buses.
  • the baseband processor may also be expressed as a baseband processing circuit or a baseband processing chip.
  • the central processing unit may also be expressed as a central processing circuit or a central processing chip.
  • the function of processing communication protocols and communication data may be built in the processor or stored in the storage unit in the form of a software program, and the processor executes the software program to implement the baseband processing function.
  • the antenna and the control circuit having a transmitting and receiving function may be regarded as the transmitting and receiving 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.
  • the terminal 10 includes a transceiver unit 101 and a processing unit 102.
  • the transceiver unit may also be referred to as a transceiver, a transceiver, a transceiver device, and the like.
  • a device used to implement the receiving function in the transceiver unit 101 may be regarded as a receiving unit, and a device used to implement the transmitting function in the transceiver unit 101 may be regarded as a transmitting unit, that is, the transceiver unit 101 includes a receiving unit and a transmitting unit.
  • the receiving unit may also be called a receiver, a receiver, a receiving circuit, and the like
  • the sending unit may be called a transmitter, a transmitter, or a transmitting circuit and the like.
  • the terminal shown in FIG. 6 can perform various actions performed by the terminal in the foregoing method. Here, in order to avoid redundant description, detailed descriptions thereof are omitted.
  • FIG. 7 is a schematic structural diagram of a network device provided in this application.
  • the network device may be, for example, a base station. As shown in FIG. 7, the base station may be applied to the communication system shown in FIG. 1 to perform functions of a network device in the foregoing method embodiment.
  • 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 (BBU) (also referred to as a digital unit (DU) ) 202.
  • RRU 201 may be referred to as a transceiver unit, a transceiver, a transceiver circuit, or a transceiver, etc., and may include at least one antenna 2011 and a radio frequency unit 2012.
  • the RRU 201 is mainly used for receiving and transmitting radio frequency signals and converting radio frequency signals to baseband signals, for example, for sending PDCCH and / or PDSCH in the foregoing method embodiments.
  • the BBU 202 is mainly used for baseband processing and controlling base stations.
  • the RRU 201 and the BBU 202 may be physically located together or physically separated, that is, a distributed base station.
  • the BBU 202 is a control center of a base station, and may also be referred to as a processing unit, which is mainly used to complete baseband processing functions, such as channel coding, multiplexing, modulation, spread spectrum, and so on.
  • the BBU (Processing Unit) 202 may be used to control a base station to execute an operation procedure on a network device in the foregoing method embodiment.
  • the BBU 202 may be composed of one or more boards, and multiple boards may jointly support a single access indication wireless access network (such as an LTE network), or may separately support different access systems. Wireless access network (such as LTE network, 5G network or other networks).
  • the BBU 202 further includes a memory 2021 and a processor 2022.
  • the memory 2021 is used to store necessary instructions and data.
  • the memory 2021 stores the QCL information or the TCI status in the foregoing method embodiment.
  • the processor 2022 is configured to control the base station to perform necessary actions, for example, to control the base station to execute the operation procedure of the network device in the foregoing method embodiment.
  • the memory 2021 and the processor 2022 may serve one or more single boards. That is, the memory and processor can be set separately on each board. It may also be that multiple boards share the same memory and processor. In addition, the necessary circuits can be set on each board.
  • the present application also provides a communication system including one or more of the aforementioned network devices, and one or more terminals.
  • the processor in the embodiment of the present application may be an integrated circuit chip and has a signal processing capability.
  • each step of the foregoing method embodiment may be completed by using an integrated logic circuit of hardware in a processor or an instruction in a form of software.
  • the above-mentioned 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 processors. Programming logic devices, discrete gate or transistor logic devices, discrete hardware components.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • Programming logic devices, discrete gate or transistor logic devices, discrete hardware components Various methods, steps, and logical block diagrams disclosed in the embodiments of the present application may be implemented or executed.
  • a general-purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
  • a software module may be located in a mature storage medium such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, or an electrically erasable programmable memory, a register, and the like.
  • the storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.
  • the memory in the embodiment of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory.
  • the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), or Erase programmable read-only memory (EPROM, EEPROM) or flash memory.
  • the volatile memory may be random access memory (RAM), which is used as an external cache.
  • RAM random access memory
  • DRAM dynamic random access memory
  • SDRAM synchronous dynamic random access memory
  • double SDRAM double SDRAM
  • DDR SDRAM double data rate synchronous dynamic random access memory
  • enhanced SDRAM enhanced SDRAM
  • SLDRAM synchronous connection dynamic random access memory
  • direct RAMbus RAM direct RAMbus RAM
  • the present application also provides a computer-readable medium on which a computer program is stored.
  • a computer program When the computer program is executed by a computer, the functions of any one of the foregoing method embodiments are implemented.
  • the present application also provides a computer program product that, when executed by a computer, implements the functions of any of the above method embodiments.
  • the computer program product includes one or more computer instructions.
  • the computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices.
  • the computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be from a website site, a computer, a server, or a data center.
  • the computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, a data center, or the like that includes one or more available medium integration.
  • the usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium (for example, a high-density digital video disc (DVD)), or a semiconductor medium (for example, a solid state disk (solid state disk), SSD)) and so on.
  • an embodiment mentioned throughout the specification means that a particular feature, structure, or characteristic related to the embodiment is included in at least one embodiment of the present application. Therefore, the various embodiments do not necessarily refer 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 size of the sequence numbers of the above processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not deal with the embodiments of the present application. The implementation process constitutes any limitation.
  • system and “network” are often used interchangeably herein.
  • the term “and / or” in this document is only a kind of association relationship describing related objects, which means that there can be three kinds of relationships, for example, A and / or B can mean: A exists alone, A and B exist simultaneously, and exists alone B these three cases.
  • the term "at least one of” or “at least one of” means all or any combination of the listed items, for example, “at least one of A, B, and C", It can be expressed that there are six cases of A alone, B alone, C alone, A and B, B and C, and A, B, and C.
  • B corresponding to A means that B is associated with A, and B can be determined according to A.
  • determining B based on A does not mean determining B based solely on A, but also determining B based on A and / or other information.
  • Computer-readable media includes 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.
  • computer-readable media may include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, disk storage media or other magnetic storage devices, or can be used to carry or store instructions or data structures Expected program code and any other medium that can be accessed by a computer. Also. Any connection is properly a computer-readable medium. For example, if software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, then coaxial cable , Fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, wireless, and microwave are included in the fixing of the media.
  • coaxial cable fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, wireless, and microwave are included in the fixing of the media.
  • disks and discs include compact discs (CDs), laser discs, optical discs, digital versatile discs (DVDs), floppy discs, and Blu-ray discs, where discs typically use magnetism to copy data, and Discs use lasers to copy data.
  • CDs compact discs
  • DVDs digital versatile discs
  • floppy discs floppy discs
  • Blu-ray discs where discs typically use magnetism to copy data, and Discs use lasers to copy data.
  • the above combination should also be included in the protection scope of the computer-readable medium.

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Abstract

本申请提供了一种通信方法和装置，该方法包括：终端确定已激活的第一带宽部分；该终端从该第一带宽部分切换至第一默认带宽部分；其中，该第一默认带宽部分为第一带宽部分分组中的一个下行带宽部分，该已激活的第一带宽部分属于第二带宽部分分组，且该第一带宽部分分组用于接收系统消息，和/或，用于初始接入。本申请实施例的通信方法和装置，能够实现多个带宽部分的回退，有利于节省终端设备能耗。

Description

通信方法和装置
本申请要求于2018年6月20日提交中国专利局、申请号为201810637732.X、申请名称为“通信方法和装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信领域，并且更具体地，涉及一种通信方法和装置。
背景技术
在第5代移动通信(the 5th generation，5G)新空口(new radio，NR)中，讨论并支持通过两步资源分配方式进行网络设备和终端间的数据传输，即网络设备可以先为终端指示一个频域连续资源，称为载波带宽部分(carrier bandwidth part，BWP)，再在该BWP中为该终端分配资源和传输数据。
一般情况下，网络设备可以先为终端配置激活的带宽部分，但是，如果该网络设备长时间没有调度该终端，会导致终端的带宽部分一直处于激活状态，浪费终端能耗。因此，如何实现上述场景下终端的节能已成为一项亟待解决的技术问题。
发明内容
本申请提供一种通信方法和装置，能够实现带宽部分的回退，有利于节省终端设备的能耗。
第一方面，提供了一种通信方法，包括：终端确定已激活的第一带宽部分；所述终端从所述第一带宽部分切换至第一默认带宽部分；其中，所述第一默认带宽部分为第一带宽部分分组中的一个下行带宽部分。
具体地，终端可以根据网络设备的配置，确定已经激活的第一带宽部分，然后从该第一带宽部分切换至第一默认带宽部分，从而实现带宽部分的回退。该第一默认带宽部分为一个下行带宽部分，且属于第一带宽部分分组。
应理解，带宽部分的切换又可以称为带宽部分的回退，具体是指去激活已激活的带宽部分，激活默认带宽部分。因此，在本申请实施例中，已激活的第一带宽部分中至少一个带宽部分和上述第一默认带宽部分是不相同的，所谓两个带宽部分不同，是指这两个带宽部分的频率位置、带宽和参数集中的至少一项不同。
本申请实施例的通信方法，通过从已激活的带宽部分切换至默认带宽部分，实现了带宽部分的回退，有利于节省终端能耗，提高系统性能。
结合第一方面，在一种可能的实现方式中，所述第一带宽部分属于第二带宽部分分组。
在带宽部分分组的基础之上，上述带宽部分的切换可以分为跨组切换和本组切换两种情况，本申请实施例对此不作限定。对于本组切换，所述第一带宽部分可以属于上述第一带宽部分分组。对于跨组切换，所述第一带宽部分可以属于第二带宽部分分组，在这种情 况下，终端实际是从第二带宽部分分组中的带宽部分切换至了第一带宽部分分组中的一个带宽部分。
可选地，默认带宽部分可以只配置在主带宽部分分组中，也可以配置在多个带宽部分分组中，本申请实施例对此不作限定。上述第一默认带宽部分分组仅仅指主带宽部分分组中的默认带宽部分。在一种可能的实现方式中，网络设备可以为每个带宽部分分组都配置一个默认带宽部分。
结合第一方面，在一种可能的实现方式中，所述第一带宽部分分组用于接收系统消息，和/或，用于初始接入。
换句话说，上述第一带宽部分分组中的下行带宽部分可以包括用于接收系统消息的带宽部分，和/或，用于初始接入的带宽部分，因此，上述第一带宽部分分组又可以称为主带宽部分分组。若上述第一带宽部分属于第二带宽部分分组，该第二带宽部分分组又可以称为从带宽部分分组。终端从第一带宽部分切换至第一默认带宽部分，即为从从带宽部分分组中的带宽部分切换至了主带宽部分分组中的一个带宽部分。
结合第一方面，在一种可能的实现方式中，所述终端从所述第一带宽部分切换至第一默认带宽部分，包括：当第一定时器期满时，所述终端从所述第一带宽部分切换至所述第一默认带宽部分。
具体地，网络设备可以为终端配置第一定时器并指示该第一定时器的时长，终端在已激活的第一带宽部分上启动该第一定时器，若该第一定时器期满(或超时)，终端还未收到网络设备发送的下行控制信令，该终端可以执行上述切换操作，即从第一带宽部分切换至第一默认带宽部分。
应理解，网络设备同样会维护该第一定时器，若终端执行了回退的操作，网络设备可以根据已配置的第一定时器获知，从而保证网络设备与终端的理解一致。
结合第一方面，在一种可能的实现方式中，所述第二带宽部分分组中包括第二默认带宽部分；所述终端从所述第一带宽部分切换至第一默认带宽部分，包括：所述终端从所述第一带宽部分切换至所述第二默认带宽部分；所述终端从所述第二默认带宽部分切换至所述第一默认带宽部分。
在上述的配置情况下，终端设备可以实现激活带宽部分的两级回退，即先从已激活的第一带宽部分切换至第二默认带宽部分，再从第二默认带宽部分切换至第一默认带宽部分。应理解，上述第二默认带宽部分的个数可能为多个，而上述第一默认带宽部分的个数为一个。
应理解，在本申请实施例中，上述第二带宽部分分组可以包括第一带宽部分分组。在这种情况下，第一带宽部分分组中的第一默认带宽部分和第二默认带宽部分的配置可以是独立的；或者，第一带宽部分分组中的第一默认带宽部分为可缺省的，而将第一带宽部分分组中的第二默认带宽部分可以定义为第一带宽部分分组中的第一默认带宽部分，即第一带宽部分分组中的第一默认带宽部分和第二默认带宽部分相同，但本申请实施例对此不作限定。在本申请实施例中，上述第二带宽部分分组可以不包括第一带宽部分分组。在这种情况下，第一带宽部分分组中的第一默认带宽部分可以定义为第一带宽部分分组中的第二默认带宽部分，即第一带宽部分分组中的第一默认带宽部分和第二默认带宽部分相同，但本申请实施例对此不作限定。
结合第一方面，在一种可能的实现方式中，所述终端从所述第一带宽部分切换至第一默认带宽部分，包括：当第二定时器的时长大于第一门限值时，所述终端从所述第一带宽部分切换至所述第二默认带宽部分；当所述第二定时器的时长大于第二门限值时，所述终端从所述第二默认带宽部分切换至所述第一默认带宽部分。
应理解，上述第二门限值大于上述第一门限值。
具体地，对于两级回退的场景，网络设备可以为终端配置一个定时器和两个门限值，即上述第二定时器、第一门限值和第二门限值，第一门限值小于或等于第二门限值，在第二定时器的时长超出第一门限值时，终端执行第一级回退，即从第一带宽部分切换至第二默认带宽部分，在第二定时器的时长超出第二门限值时，终端执行第二级回退，即从第二默认带宽部分切换至第一默认带宽部分。
结合第一方面，在一种可能的实现方式中，所述终端从所述第一带宽部分切换至所述第二默认带宽部分，包括：当第三定时器期满时，所述终端从所述第一带宽部分切换至所述第二默认带宽部分；所述终端从所述第二默认带宽部分切换至所述第一默认带宽部分，包括：当第四定时器期满时，所述终端从所述第二默认带宽部分切换至所述第一默认带宽部分。
应理解，上述第四定时器的时长大于上述第三定时器的时长。
具体地，对于两级回退的场景，网络设备可以为终端配置两个定时器和这两个定时器的时长，即上述第三定时器和第四定时器，第三定时器的时长小于或等于第四定时器的时长，在第三定时器期满时，终端执行第一级回退，即从第一带宽部分切换至第二默认带宽部分，在第四定时器期满时，终端执行第二级回退，即从第二默认带宽部分切换至第一默认带宽部分。
第二方面，提供了另一种通信方法，包括：网络设备确定多个带宽部分分组，所述多个带宽部分分组中的第一带宽部分分组包括第一默认带宽部分，所述第一带宽部分分组用于接收系统消息，和/或，用于初始接入；所述网络设备为终端配置所述第一默认带宽部分。
具体地，网络设备可以确定多个带宽部分分组，该多个带宽部分分组中的第一带宽部分分组包括第一默认带宽部分，该第一默认带宽部分可以用于终端进行回退。其中，上述第一带宽部分分组用于接收系统消息，和/或用于初始接入。换句话说，上述第一带宽部分分组可以包括用于接收系统消息的带宽部分和第一默认带宽部分，也可以包括用于初始接入的带宽部分和第一默认带宽部分，还可以上述三者都包括，本申请实施例对此不作限定。在本申请实施例中，第一带宽部分分组又可以称为主带宽部分分组。
本申请实施例的通信方法，通过网络设备确定多个带宽部分分组，并基于该多个带宽部分分组为终端配置第一默认带宽部分，以便终端能够根据网络设备的配置执行多个带宽部分的回退，即从已激活的多个带宽部分切换至该第一默认带宽部分，有利于节省终端设备的能耗，提高系统性能。
结合第二方面，在一种可能的实现方式中，所述方法还包括：所述网络设备从所述第一带宽部分分组中选择一个下行带宽部分作为所述第一默认带宽部分。
具体地，在第一带宽部分分组是显示显式配置的情况下，网络设备可以先确定第一带宽部分分组，为终端配置该第一带宽部分分组，然后从该第一带宽部分分组中选择一个下 行带宽部分作为上述第一默认带宽部分，即从主带宽部分分组中选择第一默认带宽部分，再将该第一默认带宽部分通过信令告知终端。
结合第二方面，在一种可能的实现方式中，所述方法还包括：所述网络设备从已配置的带宽部分中选择一个下行带宽部分作为所述第一默认带宽部分；所述网络设备确定多个带宽部分分组，包括：所述网络设备将所述第一默认带宽部分所属的带宽部分分组确定为所述第一带宽部分分组。
具体地，在第一带宽部分分组是隐式配置的情况下，网络设备可以先选择第一默认带宽部分，该第一默认带宽部分的可选集为已配置的至少一个带宽部分，然后，该网络设备可以将该第一默认带宽部分所在的带宽部分分组确定为第一带宽部分分组，该第一带宽部分分组即为主带宽部分分组。在这种情况下，可以通过协议规定默认带宽部分仅配置在主带宽部分分组中，终端可以根据网络设备的配置确定第一默认带宽部分，从而将该第一默认带宽部分所属的第一带宽部分分组确定为主带宽部分分组。
结合第二方面，在一种可能的实现方式中，所述方法还包括：所述网络设备为所述终端配置第二默认带宽部分，所述多个带宽部分分组中的第二带宽部分分组包括所述第二默认带宽部分。
具体地，在网络设备配置了上述第一默认带宽部分的情况下，该网络设备还可以配置第二默认带宽部分，以便终端进行两级回退，即从已激活的多个第一带宽部分回退至第二默认带宽部分，再从第二默认带宽部分回退至第一默认带宽部分。该第二默认带宽部分的可选集为已配置的带宽部分分组。换句话说，已配置的带宽部分分组包括带宽部分分组1和带宽部分分组2，网络设备需要为带宽部分分组2配置第二默认带宽部分，则该网络设备可以从带宽部分分组2所包括的带宽部分中选择一个下行带宽部分作为该带宽部分分组2的第二默认带宽部分。
应理解，该第二默认带宽部分的个数可以为一个，也可以为多个，且该第二默认带宽部分属于上述多个带宽部分分组中的第二带宽部分分组中。在一种可能的实现方式中，有A个第二带宽部分分组，该A个第二带宽部分分组中的B个第二带宽部分分组可以包括第二默认带宽部分，且该B个第二带宽部分分组中的每个第二带宽部分分组均包括一个第二默认带宽部分，其中，B小于或等于A。例如，存在5个第二带宽部分分组，其中3个第二带宽部分分组分别有各自的一个第二默认带宽部分。又例如，存在5个第二带宽部分分组，该5个第二带宽部分分组中的每个第二带宽部分分组都有各自的一个第二默认带宽部分。
结合第二方面，在一种可能的实现方式中，包括所述第二默认带宽部分的第二带宽部分分组用于接收系统消息，和/或，用于初始接入。
结合第二方面，在一种可能的实现方式中，所述多个带宽部分分组中的第二带宽部分分组包括已激活的第一带宽部分。
第三方面，提供了一种装置，包括用于执行上述第一方面至第二方面中的任一方面及其实施方式中的各步骤的单元。
在一种设计中，该装置为通信芯片，通信芯片可以包括用于发送信息或数据的输入电路或者接口，以及用于接收信息或数据的输出电路或者接口。
在另一种设计中，所述装置为终端，终端可以包括用于发送信息或数据的发射机，以 及用于接收信息或数据的接收机。
在又一种设计中，所述装置为网络设备，网络设备可以包括用于发送信息或数据的发射机，以及用于接收信息或数据的接收机。
第四方面，提供了一种装置，包括，处理器，存储器，该存储器用于存储计算机程序，该处理器用于从存储器中调用并运行该计算机程序，使得该装置执行上述第一方面至第二方面中的任一方面及其实施方式中的方法。
可选地，所述处理器为一个或多个，所述存储器为一个或多个。
可选地，所述存储器可以与所述处理器集成在一起，或者所述存储器与处理器分离设置。
可选的，该通信设备还包括，发射机(发射器)和接收机(接收器)。
第五方面，提供了一种计算机程序产品，所述计算机程序产品包括：计算机程序(也可以称为代码，或指令)，当所述计算机程序被运行时，使得计算机执行上述第一方面至第二方面中任一种可能实现方式中的方法。
第六方面，提供了一种计算机可读介质，所述计算机可读介质存储有计算机程序(也可以称为代码，或指令)当其在计算机上运行时，使得计算机执行上述第一方面至第二方面中任一种可能实现方式中的方法。
第七方面，提供了一种芯片系统，包括存储器和处理器，该存储器用于存储计算机程序，该处理器用于从存储器中调用并运行该计算机程序，使得安装有该芯片系统的通信设备执行上述第一方面至第二方面中任一种可能实现方式中的方法。
其中，该芯片系统可以包括用于发送信息或数据的输入电路或者接口，以及用于接收信息或数据的输出电路或者接口。
附图说明
图1是根据本申请实施例的通信系统的示意图。
图2是根据本申请实施例的通信方法的示例性流程图。
图3是根据本申请实施例的另一通信方法的示例性流程图。
图4是根据本申请实施例的装置的示例性框图。
图5是根据本申请实施例的另一装置的示例性框图。
图6是根据本申请实施例的终端的结构示意图。
图7是根据本申请实施例的网络设备的结构示意图。
具体实施方式
下面将结合附图，对本申请中的技术方案进行描述。
本申请实施例的技术方案可以应用于各种通信系统，例如：全球移动通讯(global system of mobile communication，GSM)系统、码分多址(code division multiple access，CDMA)系统、宽带码分多址(wideband code division multiple access，WCDMA)系统、通用分组无线业务(general packet radio service，GPRS)、长期演进(long term evolution，LTE)系统、LTE频分双工(frequency division duplex，FDD)系统、LTE时分双工(time division duplex，TDD)、通用移动通信系统(universal mobile telecommunication system， UMTS)、全球互联微波接入(worldwide interoperability for microwave access，WiMAX)通信系统、第五代(5th generation，5G)系统或新无线(new radio，NR)等。
本申请实施例中的终端可以指用户设备(user equipment，UE)、终端设备、接入终端、用户单元、用户站、移动站、移动台、远方站、远程终端、移动设备、用户终端、终端、无线通信设备、用户代理或用户装置。终端还可以是蜂窝电话、无绳电话、会话启动协议(session initiation protocol，SIP)电话、无线本地环路(wireless local loop，WLL)站、个人数字处理(personal digital assistant，PDA)、具有无线通信功能的手持设备、计算设备或连接到无线调制解调器的其它处理设备、车载设备、可穿戴设备，未来5G网络中的终端或者未来演进的公用陆地移动通信网络(public land mobile network，PLMN)中的终端等，本申请实施例对此并不限定。
本申请实施例中的网络设备可以是用于与终端通信的设备，该网络设备可以是全球移动通讯(global system of mobile communication，GSM)系统或码分多址(code division multiple access，CDMA)中的基站(base transceiver station，BTS)，也可以是宽带码分多址(wideband code division multiple access，WCDMA)系统中的基站(nodeB，NB)，还可以是LTE系统中的演进型基站(evolutional nodeB，eNB或eNodeB)，还可以是云无线接入网络(cloud radio access network，CRAN)场景下的无线控制器，或者该网络设备可以为中继站、接入点、车载设备、可穿戴设备以及5G网络中的网络设备或者未来演进的PLMN网络中的网络设备等，本申请实施例并不限定。
下面，首先对本申请所涉及的一些概念或术语进行简要介绍。
1、带宽部分(bandwidth part，BWP)
在5G NR中，讨论并支持通过两步资源分配方式进行网络设备和终端间的数据传输，即网络设备先为终端分配一个带宽部分，再在该带宽部分中为终端分配资源，通过为终端分配资源传输数据。下文中，若无特殊说明，传输既可以指上行发送也可以指下行接收。
应理解，带宽部分也可以称为载波带宽部分(carrier bandwidth part)，还可以采用其他名称，本申请实施例对此不作限定。
还应理解，小区可以是终端的服务小区。服务小区是高层从资源管理或移动性管理或服务单元的角度来描述的。每个网络设备的覆盖范围可以被划分为一个或多个服务小区，且该服务小区可以看作由一定频域资源组成，即一个服务小区可以包括一个或多个载波。载波的概念是从物理层的信号产生的角度来描述的。一个载波由一个或多个频点定义，对应一段连续或非连续的频谱，用于承载网络设备和终端间的通信数据。下行载波可以用于下行传输，上行载波可以用于上行传输。此外，可以在一个上行载波上配置多个上行带宽部分，可以在一个下行载波上配置多个下行带宽部分。
示例性地，网络设备为终端分配带宽部分可以应用于以下三个场景中的任意一个或任意组合。
(1)大带宽场景
在通信系统中，随着终端业务量的增加和终端数量的增加，系统业务量显著增加，因此，现有通信系统中提出了系统带宽为大带宽的设计，以提供较多的系统资源，从而可以提供较高的数据传输速率。在系统带宽为大带宽的通信系统中，考虑到终端的成本以及终端的业务量，终端支持的带宽可能小于系统带宽。其中，终端支持的带宽越大，终端的处 理能力越强，终端的数据传输速率可能越高，终端的设计成本可能越高。终端支持的带宽还可以称为终端的带宽能力。示例性地，在5G系统中，系统带宽最大可以为400MHz，终端的带宽能力可以为20MHz、50MHz或100MHz等。在无线通信系统中，不同终端的带宽能力可以相同也可以不同，本申请实施例对此不做限制。
在系统带宽为大带宽的通信系统中，由于终端的带宽能力小于系统带宽，网络设备可以从系统频率资源中为终端配置带宽部分，该带宽部分的带宽小于等于终端的带宽能力。当终端和网络设备进行通信时，网络设备可以将为终端配置的带宽部分中的部分或全部资源分配给终端，用于进行网络设备和终端之间的通信。
(2)多参数集(numerology)场景
在无线通信系统中，例如5G系统中，为了支持更多的业务类型和/或通信场景，提出了支持多种参数集的设计。参数集为通信系统所采用的参数。通信系统(例如5G)可以支持多种参数集。参数集可以通过以下参数信息中的一个或多个定义：子载波间隔、循环前缀(cyclic prefix，CP)、时间单位、带宽等。对于不同的业务类型和/或通信场景，可以独立设置参数集。
在一种可能的配置中，网络设备可以在系统频率资源中配置多个带宽部分，为该多个带宽部分中的每个带宽部分独立配置参数集，用于在系统频率资源中支持多种业务类型和/或通信场景。其中，不同带宽部分的参数集可以相同，也可以不相同，本申请不做限制。
当终端和网络设备进行通信时，网络设备可以基于该通信对应的业务类型和/或通信场景确定用于进行通信的参数集A，从而可以基于参数集A为终端配置相应的带宽部分。其中，该相应的带宽部分的参数集被配置为参数集A。当终端和网络设备进行通信时，网络设备可以将为终端配置的带宽部分中的部分或全部资源分配给终端，用于进行网络设备和终端间的通信。
(3)带宽回退
当终端和网络设备进行通信时，网络设备可以基于终端的业务量为终端配置带宽部分，用于节省终端的功耗。示例性地，如果终端没有业务，终端可以只在较小的带宽部分中接收控制信息，可以降低终端的射频处理的任务量和基带处理的任务量，从而可以减少终端的功耗。如果终端的业务量较少，网络设备可以为终端配置带宽较小的带宽部分，可以降低终端的射频处理的任务量和基带处理的任务量，从而可以减少终端的功耗。如果终端的业务量较多，网络设备可以为终端配置带宽较大的带宽部分，从而可以提供更高的数据传输速率。当终端和网络设备进行通信时，网络设备可以将为终端配置的带宽部分中的部分或全部资源分配给终端，用于进行网络设备和终端间的通信。
示例性地，该带宽部分可以是下行带宽部分，用于终端下行接收，此时该带宽部分的带宽不超过终端的接收带宽能力；该带宽部分也可以是上行带宽部分，用于终端上行发送，此时该带宽部分的带宽不超过终端的发送带宽能力。
网络设备可以给终端配置多个带宽部分，该带宽部分既包括上行带宽部分也包括下行带宽部分。通常，上行带宽部分和下行带宽部分是独立配置的，包括独立配置其频率位置、带宽和参数集。
在给定时刻，终端基于配置带宽部分中的激活带宽部分进行数据传输。终端不期望在下行带宽部分之外进行下行接收，不期望在上行带宽部分之外进行上行发送。这种传输特 征也可以称为自包含传输。例如，在给定时刻，终端有一个激活的下行带宽部分和一个激活的上行带宽部分(如果小区中配置了增补上行载波(supplementary uplink，SUL)，则还可以额外激活一个上行带宽部分)。对于时分双工(time division duplex，TDD)模式，激活的上行带宽部分和下行带宽部分中心对齐(不要求SUL上的上行带宽部分要与下行带宽部分对齐)，此时称激活的带宽部分和下行带宽部分构成一个带宽部分对。
2、带宽部分分组
当期望能够支持终端在给定时刻在一个小区中使用多个激活下行带宽部分和多个激活上行带宽部分传输数据，如下的带宽部分分组的概念被提出。将每个带宽部分分组中包括的至少一个激活的带宽部分作为一个整体，实现终端同时使用多个带宽部分传输数据，系统兼容性高，实现简单。
网络设备可以将为终端的同一业务配置的带宽部分划分为一个带宽部分分组，例如，一个带宽部分分组用于传输增强移动宽带(enhance mobile broadband，eMBB)业务，另一个带宽部分分组用于传输超高可靠超低时延通信(ultra reliable&low latency communication，URLLC)业务；或者，一个带宽部分分组用于接入链路，另一个带宽部分分组用于回传链路；或者，一个带宽部分分组用于网络设备和终端间的链路，另一个带宽部分分组用于终端和终端之间的链路。当然，网络设备可以有其他划分准则，本申请对此不做限制。
下面针对两种不同的分组方案详细介绍如何对带宽部分进行分组。
(1)第一种带宽部分分组方案
为终端配置的N个带宽部分可以被配置为或者被表示为G个带宽部分分组，该G个带宽部分分组中的第i个带宽部分分组中包括N i,UL个上行带宽部分和N i,DL个下行带宽部分。上述N i,UL个上行带宽部分和N i,DL个下行带宽部分的数量在第i个带宽部分分组中可以相同或不同。
(2)第二种带宽部分分组方案
为终端配置的N个带宽部分可以被配置为或者被表示为G个带宽部分分组，该G个带宽部分分组中的第i个带宽部分分组由N i,UL个上行带宽部分构成，即该第i个带宽部分分组为上行带宽部分分组；或者，该G个带宽部分分组中的第i个带宽部分分组由N i,DL个下行带宽部分构成，即该第i个带宽部分分组为下行带宽部分分组。
在此基础上，上行带宽部分分组可以和下行带宽部分分组进行配对或者进行对应，称之为带宽部分分组配对。这里，不区分是FDD模式还是TDD模式，配对是为了支持终端的上行传输和下行反馈。上述带宽部分分组配对中的带宽部分分组数量至少为两个。
下文中，若无特殊说明，带宽部分分组既可以指第一种带宽部分分组方案中的带宽部分分组，也可以指第二种带宽部分分组中的上行带宽部分分组和/或下行带宽部分分组。
此外，基于带宽部分分组，终端有两种可能的传输模式，即频分复用(frequency division multiplexing，FDM)模式和时分复用(time division multiplexing，TDM)模式。
在FDM模式下，终端可以并行地使用这些激活的带宽部分传输数据，例如，一个带宽部分分组用于传输eMBB业务，另一个带宽部分分组用于传输URLLC业务；或者，一个带宽部分分组用于接入链路，另一个带宽部分分组用于回传链路；或者，一个带宽部分分组用于网络设备和终端间的链路，另一个带宽部分分组用于终端和终端间的链路。此时 需要满足的服务质量(quality of service，QoS)需求可以是各带宽部分分组上的(总体或平均)传输速率/吞吐量。
在TDM模式下，终端在给定时刻只使用多个带宽部分分组中的一个带宽部分分组的带宽部分进行数据传输，但通过激活多个属于不同带宽部分分组的带宽部分，可以是终端不增加并行处理能力的同时，快速响应不同的业务(例如，带宽部分间零时延的切换)。
应理解，在本申请中，若一个带宽部分分组中至少存在一个带宽部分处于激活状态，则认为该带宽部分分组处于激活状态，若一个带宽部分分组中所有的带宽部分均处于去激活状态，则认为该带宽部分处于去激活状态。
还应理解，去激活可以理解为不进行数据传输，但不进行数据传输时带宽部分仍然可以是激活状态。例如，在TDM模式下，终端在给定时刻只使用多个带宽部分分组中的一个带宽部分分组的带宽部分进行数据传输。此外，终端需要在激活的下行带宽部分上盲检下行控制信道，而不在去激活的下行带宽部分上盲检下行控制信道，后续演进中，终端也可能不在激活的下行带宽部分上盲检下行控制信道，例如，在支持跨带宽部分分组调度的情况下。下面对带宽部分分组的跨带宽部分分组调度和自包含调度进行详细解释。
应理解，带宽部分分组可以具有自包含传输的特性。所谓自包含传输是指当通过下行控制信令进行带宽部分粒度的激活/去激活，或通过下行控制信令进行带宽部分对粒度的激活/去激活，即带宽部分的切换时，对于第一种带宽部分分组方案，承载该下行控制信令的带宽部分与该下行控制信令指示的带宽部分属于同一个带宽部分分组；对于第二种带宽部分分组方案，当下行控制信令指示的带宽部分是下行带宽部分时，承载该下行控制信令的带宽部分与该下行控制信令指示的带宽部分属于同一个下行带宽部分分组，当下行控制信令指示的带宽部分是上行带宽部分时，承载该下行控制信令的带宽部分与该下行控制信令指示的带宽部分分别属于配对的下行带宽部分分组和上行带宽部分分组。
还应理解，带宽部分分组也可以支持跨带宽部分分组调度的特性。所谓跨带宽部分分组调度是指当通过下行控制信令进行数据调度时，对于第一种带宽部分分组方案，承载该下行控制信令的带宽部分与该下行控制信令指示的带宽部分属于不同带宽部分分组；对于第二种带宽部分分组方案，当下行控制信令指示的带宽部分是下行带宽部分时，承载该下行控制信令的带宽部分与该下行控制信令指示的带宽部分属于不同的下行带宽部分分组，当下行控制信令指示的带宽部分是上行带宽部分时，承载该下行控制信令的带宽部分属于的下行带宽部分分组与该下行控制信令指示的带宽部分属于上行带宽部分分组不是配对的下行带宽部分分组和上行带宽部分分组。
3、初始接入带宽部分
初始接入带宽部分包括初始接入下行带宽部分和初始接入上行带宽部分，用于终端进行初始接入，建立与网络设备的连接。
初始接入下行带宽部分通过主消息块(master information block，MIB)通知确定。举例来说，终端通过盲检同步信号栅格找到同步信号块，该同步信号块中的MIB中携带的信息包括初始接入下行带宽部分频域最低位置与该同步信号块频域最低位置之间的偏移，以及该初始接入下行带宽部分的带宽，终端根据MIB确定初始接入下行带宽部分。终端在该初始接入下行带宽部分中接收第一系统消息(system information block 1，SIB 1)、随机接入响应(random access response，RAR)和消息4(Message 4)，以及这些消息的 调度信令。
在另一种实现方式中，可以定义初始接入下行载波带宽部分的频域位置和带宽与调度SIB 1的控制信道资源集合(control resource set，CORESET)的频域位置和带宽相同。此时，MIB可以通知该CORESET的频域位置最低位置与该同步信号块频域最低位置之间的偏移，以及该CORESET的带宽，间接地指示初始接入下行载波带宽部分。
初始接入上行带宽部分通过SIB 1通知确定。举例来说，SIB 1中携带的消息包括参考点A(reference point A)相对于参考频率位置(例如，同步信号块的最低RB的最低子载波)的第一频率偏移(offset1)、上行虚拟载波起始资源块(resource block，RB)相对于参考点A的第二频率偏移(offset2)、初始接入上行带宽部分的起始RB相对于上行虚拟载波起始RB的第三频率偏移(offset3)，以及初始接入上行带宽部分的带宽。其中，可以基于参考点A定义公共RB索引，公共RB从公共RB 0按频率增大的方向编号，公共RB 0的最低子载波的中心即为参考点A。终端在该初始接入上行带宽部分中发送物理随机接入信道(physical random access channel，PRACH)和消息3(Message 3)。
应理解，初始接入带宽部分可以包括于主带宽部分分组中，也可以不包括在任何一个带宽部分分组中，本申请实施例对此不作限定。下面先介绍主带宽部分分组的概念，再对主带宽部分分组和初始接入带宽部分之间的关系进行详细地说明。
4、主带宽部分分组
主带宽部分分组可以定义为包括用于接收系统消息的带宽部分和/或用于初始接入的带宽部分的带宽部分分组。
(1)主带宽部分分组包括用于接收系统消息的带宽部分
主带宽部分分组用于终端接收系统消息，换而言之，终端在主带宽部分分组中接收系统消息(包括用于调度该系统消息的DCI)。例如，终端可以在任何激活的带宽部分上接收系统消息。当系统支持在给定时刻激活一个带宽部分，所以终端会接收到一份系统消息。针对在多激活带宽部分场景下，如果终端仍需要在每个激活的带宽部分上接收系统消息，一来因为这些系统消息所携带的内容没有差异，接收多份并不能获得增益，二来终端需要盲检多个用于调度系统消息的DCI，会增加终端的盲检次数，进而增加终端的能耗。因此，可以限制终端的行为，即在多激活带宽部分场景下，终端也只需要接收一份系统消息。在本文中，定义用于接收该系统消息的带宽部分为主带宽部分分组中的一个激活下行带宽部分。本文将非主带宽部分分组称为从带宽部分分组，但应理解，主带宽部分分组和从带宽部分分组仅仅是为了便于描述而采用的示例性名称，也可以采用其他名称，本申请对此不作限定。
进一步地，在TDM模式下，对于第一种带宽部分分组方案，主带宽部分分组为当前用于数据传输的带宽部分分组，对于第二种带宽部分分组方案，主带宽部分分组为当前用于下行数据传输的下行带宽部分分组，或者当前用于上行数据传输的上行带宽部分分组对应的下行带宽部分分组。通过主带宽部分分组的动态切换，可以使终端不增加并行处理能力的同时，快速响应不同的业务。此外，终端只在主带宽部分分组中盲检下行控制信息。
(2)主带宽部分分组包括用于初始接入带宽部分
在这种情况下，初始接入带宽部分包括在主带宽部分分组中，因此，可以根据初始接入带宽部分的位置，进行带宽部分的划分，从而确定主带宽部分分组。具体地，网络设备 可以按照隐式或显式两种情况配置主带宽部分分组。
若主带宽部分分组是隐式配置的，则终端可以根据配置带宽部分分组时，带宽部分分组中是否包含初始接入下行带宽部分来确定该带宽部分分组是否为主带宽部分分组。若带宽部分分组中包含初始接入下行带宽部分，则该带宽部分分组为主带宽部分分组；反之，该带宽部分分组不是主带宽部分分组。
若主带宽部分分组是显式配置的，则网络设备和终端可以将初始接入带宽部分关联到该主带宽部分分组中。
对于显示配置的情况，举例而言，初始接入带宽部分为带宽部分0，网络设备额外配置了3个带宽部分，即带宽部分1、带宽部分2和带宽部分3。该网络设备配置2个带宽部分分组，其中，带宽部分分组1中包括带宽部分1，带宽部分分组2中包括带宽部分2和带宽部分3，且该网络设备配置带宽部分分组1为主带宽部分分组，则带宽部分分组1中还包括初始接入下行带宽部分，即带宽部分分组1包括带宽部分0和带宽部分1，带宽部分分组2包括带宽部分2和带宽部分3。
再举例，初始接入带宽部分为带宽部分0，网络设备额外配置了4个带宽部分，即带宽部分1、带宽部分2、带宽部分3和带宽部分4。网络设备配置2个带宽部分分组，其中，带宽部分分组1中包括的带宽部分1和带宽部分2，带宽部分分组2中包括带宽部分3和带宽部分4，且该网络设备配置带宽部分分组1为主带宽部分分组，则带宽部分分组1中还包括初始接入下行带宽部分，即带宽部分分组1包括带宽部分0、带宽部分1和带宽部分2，带宽部分分组2包括带宽部分3和带宽部分4。
应理解，将初始接入下行带宽部分配置在一个下行带宽部分分组中，有利于保证带宽部分分组自包含传输的特性，特别是在终端只被配置了一个(下行)带宽部分分组的情况下。当允许通过下行控制信令指示带宽部分切换至初始接入下行带宽部分时，需要将初始接入下行带宽部分配置在一个下行带宽部分分组中。当终端只被配置了一个(下行)带宽部分分组时，该带宽部分分组也可以被默认为主带宽部分分组。
在本申请中，定义初始接入带宽部分所在的带宽部分分组为主带宽部分分组，有利于节省网络设备侧发送系统消息的开销。一种可能的应用场景是FDM模式，终端并行地使用这些激活的带宽部分传输数据。因为网络设备一定会在初始接入下行带宽部分上发送系统消息，即初始接入下行带宽部分所在带宽部分分组中必然包括系统消息，将该带宽部分分组定义为主带宽部分分组，可以让网络设备不必其他带宽部分分组中发送系统消息，从而节省网络中系统消息的开销。
(3)初始接入带宽部分不包括在任一个带宽部分分组中
在这种情况下，网络设备需要指示主带宽部分分组。该限定也可以修改为：初始接入带宽部分不在主带宽部分分组中。
举例而言，初始接入带宽部分为带宽部分0，网络设备额外配置了4个带宽部分，即带宽部分1、带宽部分2、带宽部分3和带宽部分4。网络设备配置2个带宽部分分组，其中，带宽部分分组1中包括带宽部分1和带宽部分2，带宽部分分组2中包括带宽部分3和带宽部分4，且该网络设备配置带宽部分分组1为主带宽部分分组，则终端最终被配置有：包括带宽部分1和带宽部分2的带宽部分分组1，包括带宽部分3和带宽部分4的带宽部分分组2，和独立于任一个带宽部分分组之外的初始接入带宽部分，即带宽部分0。
应理解，将初始接入下行带宽部分配置在任一个带宽部分分组之外，有利于动态地切换主带宽部分分组。在TDM模式下，即终端在给定时刻只使用多个带宽部分分组中的一个带宽部分分组进行数据传输，对于第一种带宽部分分组方案，主带宽部分分组为当前用于数据传输的带宽部分分组，对于第二种带宽部分分组方案，主带宽部分分组为当前用于下行数据传输的下行带宽部分分组，或者当前用于上行数据传输的上行带宽部分分组对应的下行带宽部分分组。通过主带宽部分分组的动态切换，可以使终端不增加并行处理能力的同时，快速响应不同的业务，也有利于保证主带宽部分分组自包含传输的特性。此外，终端可以只在主带宽部分分组中盲检下行控制信息。
在一种可能的实现方式中，可以根据不同的情况，确定初始接入带宽部分与带宽部分分组之间的关系，即采用上述情况(2)或者情况(3)。
具体地，当网络设备额外配置的带宽部分的个数小于N时，初始接入带宽部分在主带宽部分分组中，即上述情况(2)；当网络设备额外配置的带宽部分的个数大于或等于N时，初始接入带宽部分可以不包括在任一个带宽部分分组中，即上述情况(3)。
例如，下行控制信息中最多只有2比特用于指示配置的带宽部分，因此，当额外配置的带宽部分的个数小于4(N＝4)时，需要支持通过下行控制信息指示初始接入带宽部分；而当额外配置的带宽部分的个数大于或等于4时，可以不支持通过下行控制信息指示初始接入带宽部分。
作为一个可选的实施例，在TDM模式下，初始接入带宽部分可以不在任一个带宽部分分组中，或者初始接入带宽部分不在主带宽部分分组中；在FDM模式下，初始接入带宽部分可以在主带宽部分分组中。
为便于理解本申请实施例，首先结合图1简单介绍适用于本申请实施例的通信系统。图1是适用于本申请实施例的通信系统100的示意图。如图1所示，该通信系统100包括至少两个通信设备，例如，网络设备110和终端120，其中，网络设备110与终端120之间可以通过无线连接进行数据通信。
在上述带宽部分分组的基础之上，如何实现激活带宽部分场景下终端的节能已成为一项亟待解决的技术问题。有鉴于此，本申请提供了一种通信方法，能够实现激活带宽部分的回退，从而节省终端设备的能耗。下面，结合图2至图3，对本申请所提供的通信方法进行详细描述。
图2是根据本申请实施例的通信方法200的示例性流程图。应理解，图2所示的方法中的终端可以对应于图1所示的终端中的任一终端。
S210，终端确定已激活的第一带宽部分；
S220，所述终端从所述第一带宽部分切换至第一默认带宽部分，其中，所述第一默认带宽部分为第一带宽部分分组中的一个下行带宽部分。
具体地，终端可以根据网络设备的配置，确定已经激活的第一带宽部分，然后从该第一带宽部分切换至第一默认带宽部分，从而实现带宽部分的回退。该第一默认带宽部分为一个下行带宽部分，且属于第一带宽部分分组。
应理解，带宽部分的切换又可以称为带宽部分的回退，具体是指去激活已激活的带宽部分，激活默认带宽部分。因此，在本申请实施例中，已激活的第一带宽部分中至少一个第一带宽部分和上述第一默认带宽部分是不相同的，所谓两个带宽部分不同，是指这两个 带宽部分的频率位置、带宽和参数集中的至少一项不同。
本申请实施例的通信方法，通过从已激活的带宽部分切换至默认带宽部分，实现了带宽部分的回退，有利于节省终端能耗，提高系统性能。
作为一个可选的实施例，在带宽部分分组的基础之上，上述带宽部分的切换可以分为跨组切换和本组切换两种情况，本申请实施例对此不作限定。对于本组切换，所述第一带宽部分可以属于上述第一带宽部分分组。对于跨组切换，所述第一带宽部分可以属于第二带宽部分分组，在这种情况下，终端实际是从第二带宽部分分组中的带宽部分切换至了第一带宽部分分组中的一个带宽部分。
可选地，默认带宽部分可以只配置在主带宽部分分组中，也可以配置在多个带宽部分分组中，本申请实施例对此不作限定。上述第一默认带宽部分分组仅仅指主带宽部分分组中的默认带宽部分。在一种可能的实现方式中，网络设备可以为每个带宽部分分组都配置一个默认带宽部分。
作为一个可选的实施例，所述第一带宽部分分组用于接收系统消息，和/或，用于初始接入。
换句话说，上述第一带宽部分分组中的下行带宽部分可以包括用于接收系统消息的带宽部分，和/或，用于初始接入的带宽部分，因此，上述第一带宽部分分组又可以称为主带宽部分分组。若上述第一带宽部分属于第二带宽部分分组，该第二带宽部分分组又可以称为从带宽部分分组。终端从第一带宽部分切换至第一默认带宽部分，即为从从带宽部分分组中的带宽部分切换至了主带宽部分分组中的一个带宽部分。
在本申请中，针对激活带宽部分的回退，网络设备可以配置三种具体的实现方式，下面分别对应三种情况进行详细描述。
情况一
作为一个可选的实施例，所述第一带宽部分分组中包括第一默认带宽部分，所述终端可以从所述第一带宽部分切换至第一默认带宽部分。
具体地，上述第一带宽部分分组包括第一默认带宽部分，可选地，上述第一带宽部分分组为主带宽部分分组；终端可以直接从已激活的第一带宽部分回退到主带宽部分分组中的第一默认带宽部分。网络设备可以通过显式或隐式的方式为终端配置上述第一默认带宽部分，本申请实施例对此不作限定。
在第一带宽部分分组是显式配置的情况下，网络设备可以先确定第一带宽部分分组，为终端配置该第一带宽部分分组，然后从该第一带宽部分分组中选择一个下行带宽部分作为上述第一默认带宽部分，即从主带宽部分分组中选择第一默认带宽部分，再将该第一默认带宽部分通过信令告知终端。
在第一带宽部分分组是隐式配置的情况下，网络设备可以先选择第一默认带宽部分，再将该第一默认带宽部分所在的带宽部分分组确定为第一带宽部分分组，该第一带宽部分分组即为主带宽部分分组。在这种情况下，可以通过协议规定默认带宽部分仅配置在主带宽部分分组中，终端可以根据网络设备的配置确定第一默认带宽部分，从而将该第一默认带宽部分所属的第一带宽部分分组确定为主带宽部分分组。这种配置方法的一个典型应用场景是当初始接入带宽部分不属于任一个带宽部分分组时，可以通过这种配置方法确定主带宽部分分组。在主带宽部分分组动态切换之前，终端需要知道第一次传输在哪个带宽部 分分组中。
在上述的配置情况下，终端可以只维护一个用于带宽部分回退的定时器(即下述第一定时器)。
作为一个可选的实施例，所述终端从所述第一带宽部分切换至第一默认带宽部分，包括：当第一定时器期满时，所述终端从所述第一带宽部分切换至所述第一默认带宽部分。
具体地，网络设备可以为终端配置第一定时器并指示该第一定时器的时长，终端在已激活的第一带宽部分上启动该第一定时器，若该第一定时器期满(或超时)，终端还未收到网络设备发送的下行控制信令，该终端可以执行上述切换操作，即从第一带宽部分切换至第一默认带宽部分。
应理解，网络设备同样会维护该第一定时器，若终端执行了回退的操作，网络设备可以根据已配置的第一定时器获知，从而保证网络设备与终端的理解一致。
还应理解，将第一默认带宽部分仅配置在主带宽部分分组中，有利于终端更有效地节能。激活带宽部分的一个需求是并行地使用这些激活的载波带宽部分传输数据，此时，需要满足的服务质量(quality of service，QoS)需求是(总体或平均)传输速率/吞吐量。然而，终端进入节能状态时，需要满足的QoS需求是终端的能耗。因此，在终端进入节能状态时，若仍然保持激活的带宽部分，不利于这一QoS需求。
然而，如上所述，若终端只有一个默认载波带宽部分，则当终端节能时，需要去激活从载波带宽部分分组。当从载波带宽部分分组用于URLLC这样的业务时，若有突发URLLC业务到来，终端需要先激活从载波带宽部分，再进行数据传输。这样可能会带来不必要的时延(特别是当只支持半静态的载波带宽部分分组激活/去激活时)，严重影响URLLC低时延的QoS需求。因此，在这种场景下，可以采用下述情况二。
作为另一个可选的实施例，若上述第一带宽部分分组中未配置第一默认带宽部分，终端可以从已激活的第一带宽部分切换至初始接入带宽部分。
应理解，该初始接入带宽部分的个数为一个，且该初始接入带宽部分可以包括在主带宽部分分组中，也可以不包括在主带宽部分分组中，或者，该初始接入带宽部分不包括在任何一个带宽部分分组中，本申请实施例对此不作限定。
情况二
作为一个可选的实施例，所述第二带宽部分分组中包括第二默认带宽部分；所述终端可以从所述第一带宽部分切换至所述第二默认带宽部分。
具体地，上述第一带宽部分属于第二带宽部分分组，且该第二带宽部分分组包括第二默认带宽部分。终端可以从已激活的第一带宽部分切换至第二默认带宽部分。该第二默认带宽部分的个数可以是多个。
在一种可能的实现方式中，有A个第二带宽部分分组，该A个第二带宽部分分组中的B个第二带宽部分分组可以包括第二默认带宽部分，且该B个第二带宽部分分组中的每个第二带宽部分分组均包括一个第二默认带宽部分，其中，B小于或等于A。例如，存在5个第二带宽部分分组，其中3个第二带宽部分分组分别有各自的一个第二默认带宽部分。又例如，存在5个第二带宽部分分组，该5个第二带宽部分分组中的每个第二带宽部分分组都有各自的一个第二默认带宽部分。
在一种可能的实现方式中，上述第二带宽部分分组中的每个带宽部分分组中都可以配 置有第二默认带宽部分。这种配置方法有利于终端快速响应不同的突发业务。
在上述的配置情况下，网络设备和终端可能只维护一个定时器，也可能对应每个第二默认带宽部分维护一个独立的定时器，本申请实施例对此不作限定。
当终端只维护一个定时器时，若该定时器期满，终端从已激活的第一带宽部分上分别回退至对应的第二默认带宽部分上。其中，若一个第一带宽部分与一个第二默认带宽部分相对应，则该第一带宽部分与该第二默认带宽部分属于同一个带宽部分分组。例如，带宽部分1、带宽部分2和带宽部分3为已激活的3个第一带宽部分，带宽部分1和带宽部分2属于带宽部分分组1，带宽部分3属于带宽部分分组2，则带宽部分分组1具有一个第二默认带宽部分，带宽部分分组2具有一个第二默认带宽部分，终端可以从带宽部分1和带宽部分2回退至带宽部分分组1中的第二默认带宽部分，从带宽部分3回退至带宽部分分组2中的第二默认带宽部分。
当终端对应每个第二默认带宽部分维护一个独立的定时器时，假设定时器1对应带宽部分分组1中的第二默认带宽部分，若定时器1期满，只有该定时器1所对应的带宽部分分组1中的已激活的带宽部分进行回退，即终端可以将该定时器1对应的带宽部分分组1中的已激活的带宽部分切换至该定时器1对应的带宽部分分组1中的第二默认带宽部分。
除此之外，这种情况下，网络设备还可以重新配置定时器的重启条件。
对于第一种带宽部分分组方案，若终端在带宽部分分组A中接收到终端特定下行控制信令，则该终端只重启该带宽部分分组1对应的定时器，其中，该终端特定下行控制信令可以是上行调度DCI，也可以是下行调度DCI。
对于第二种带宽部分分组方案，若终端在下行带宽部分分组B中接收到下行调度DCI，或者终端在与该下行带宽部分分组B对应的上行带宽部分分组C中接收到上行调度DCI，则该终端只重启该下行带宽部分分组B对应的定时器。
作为另一个可选的实施例，存在至少一个带宽部分分组中没有被配置上述第二默认带宽部分，终端可以从上述第一带宽部分中没有配置第二默认带宽部分的对应的带宽部分分组的第一带宽部分切换至初始接入带宽部分。
应理解，该初始接入带宽部分可以包括在主带宽部分分组中，也可以不包括在主带宽部分分组中，或者，该初始接入带宽部分不包括在任何一个带宽部分分组中，本申请实施例对此不作限定。
具体地，当终端只维护一个定时器时，若定时器期满，终端可以将没有配置第二默认带宽部分的带宽部分分组中的已激活的带宽部分回退至初始接入带宽部分。当终端对应至少一个带宽部分分组中的每个带宽部分分组分别维护一个独立的定时器时，对于没有配置第二默认带宽部分的带宽部分分组而言，以带宽部分分组1为例，该带宽部分分组1对应的定时器期满后，该终端可以只将该带宽部分分组1中的已激活的第一带宽部分回退至初始接入带宽部分。可选地，对于没有配置第二默认带宽部分的带宽部分分组而言，其对应的定时器是同一个定时器。
情况三
作为一个可选的实施例，所述第一带宽部分分组中包括第一默认带宽部分，所述第二带宽部分分组中包括第二默认带宽部分；所述终端从所述第一带宽部分切换至第一默认带宽部分，包括：所述终端从所述第一带宽部分切换至所述第二默认带宽部分；所述终端从 所述第二默认带宽部分切换至所述第一默认带宽部分。
在上述的配置情况下，终端设备可以实现激活带宽部分的两级回退，即先从已激活的第一带宽部分切换至第二默认带宽部分，再从第二默认带宽部分切换至第一默认带宽部分。应理解，上述第二默认带宽部分的个数可能为多个，而上述第一默认带宽部分的个数为一个。
应理解，在本申请实施例中，上述第二带宽部分分组可以包括第一带宽部分分组。在这种情况下，第一带宽部分分组中的第一默认带宽部分和第二默认带宽部分的配置可以是独立的；或者，第一带宽部分分组中的第一默认带宽部分为可缺省的，而将第一带宽部分分组中的第二默认带宽部分可以定义为第一带宽部分分组中的第一默认带宽部分，即第一带宽部分分组中的第一默认带宽部分和第二默认带宽部分相同，但本申请实施例对此不作限定。在本申请实施例中，上述第二带宽部分分组可以不包括第一带宽部分分组。在这种情况下，第一带宽部分分组中的第一默认带宽部分可以定义为第一带宽部分分组中的第二默认带宽部分，即第一带宽部分分组中的第一默认带宽部分和第二默认带宽部分相同，但本申请实施例对此不作限定。
可选地，上述第一带宽部分分组为主带宽部分分组，上述第二带宽部分分组包括从带宽部分分组，在执行第一级回退时，终端可以从已激活的第一带宽部分切换至从带宽部分分组对应的第二默认带宽部分，在执行第二级回退时，终端可以从从带宽部分分组中的第二默认带宽部分切换至主带宽部分分组中的第一默认带宽部分。
作为一个可选的实施例，所述终端从所述第一带宽部分切换至第一默认带宽部分，包括：当第二定时器的时长大于第一门限值时，所述终端从所述第一带宽部分切换至所述第二默认带宽部分；当所述第二定时器的时长大于第二门限值时，所述终端从所述第二默认带宽部分切换至所述第一默认带宽部分。
应理解，上述第二门限值大于上述第一门限值。
具体地，对于两级回退的场景，网络设备可以为终端配置一个定时器和两个门限值，即上述第二定时器、第一门限值和第二门限值，第一门限值小于或等于第二门限值，在第二定时器的时长超出第一门限值时，终端执行第一级回退，即从第一带宽部分切换至第二默认带宽部分，在第二定时器的时长超出第二门限值时，终端执行第二级回退，即从第二默认带宽部分切换至第一默认带宽部分。
作为一个可选的实施例，所述终端从所述第一带宽部分切换至所述第二默认带宽部分，包括：当第三定时器期满时，所述终端从所述第一带宽部分切换至所述第二默认带宽部分；所述终端从所述第二默认带宽部分切换至所述第一默认带宽部分，包括：当第四定时器期满时，所述终端从所述第二默认带宽部分切换至所述第一默认带宽部分。
应理解，上述第四定时器的时长大于上述第三定时器的时长。
具体地，对于两级回退的场景，网络设备可以为终端配置两个定时器和这两个定时器的时长，即上述第三定时器和第四定时器，第三定时器的时长小于或等于第四定时器的时长，在第三定时器期满时，终端执行第一级回退，即从第一带宽部分切换至第二默认带宽部分，在第四定时器期满时，终端执行第二级回退，即从第二默认带宽部分切换至第一默认带宽部分。
作为另一个可选的实施例，存在至少一个带宽部分分组中没有被配置上述第二默认带 宽部分。在这种配置情况下，终端可以对配置了第二默认带宽部分的带宽部分分组执行上述两级回退操作，对没有配置上述第二默认带宽部分的带宽部分分组执行一级回退操作。无论是否有配置第一默认带宽部分，终端最终都会回退至初始接入带宽部分。
具体地，若上述已激活的第一带宽部分对应5个带宽部分分组，其中3个带宽部分分组中的每个带宽部分分组分别配置了第二默认带宽部分，另外2个带宽部分分组未配置第二默认带宽部分。该终端可以针对该3个带宽部分分组执行两级回退操作，即先从该3个带宽部分分组对应的第一带宽部分切换至该3个带宽部分分组对应的第二默认带宽部分，再从该3个第二默认带宽部分切换至初始接入带宽部分。该终端可以针对另外2个带宽部分分组执行一级回退操作，即从上述另外2个带宽部分分组对应的第一带宽部分直接切换至初始接入带宽部分。
应理解，上述配置有第二默认带宽部分的带宽部分分组的回退和未配置有第二默认带宽部分的带宽部分分组的回退可以采用相同的定时器，也可以采用不同的定时器。具体而言，未配置有第二默认带宽部分的带宽部分分组进行回退(即从未配置第二默认带宽部分的带宽部分分组中已激活的带宽部分切换至初始接入带宽部分)所采用的定时器可以与该配置有第二默认带宽部分的带宽部分分组的第一级回退(即从配置有第二默认带宽部分的带宽部分分组中已激活的带宽部分切换至第二默认带宽部分)采用的定时器相同，也可以与该配置有第二默认带宽部分的带宽部分分组的第二级回退(即从上述第二默认带宽部分切换至初始接入带宽部分)所采用的定时器相同，当然，未配置有第二默认带宽部分的带宽部分分组进行回退也可以采用其他不同的定时器，本申请实施例对此不作限定。
还应理解，对于两级回退的方案，若配置了第一默认带宽部分，一般情况下，第一带宽部分对应的带宽部分分组中每个带宽部分分组都会配置第二默认带宽部分，从而保证终端最终可以从已激活的第一带宽部分回退至该第一默认带宽部分。
图3是根据本申请实施例的通信方法300的示例性流程图。应理解，图3所示的方法中的网络设备可以对应于图1所示的系统100中的网络设备。
S310，网络设备确定多个带宽部分分组，所述多个带宽部分分组中的第一带宽部分分组包括第一默认带宽部分，所述第一带宽部分分组用于接收系统消息，和/或，用于初始接入；
S320，所述网络设备为终端配置所述第一默认带宽部分。
具体地，网络设备可以确定多个带宽部分分组，该多个带宽部分分组中的第一带宽部分分组包括第一默认带宽部分，该第一默认带宽部分可以用于终端进行回退。其中，上述第一带宽部分分组用于接收系统消息，和/或用于初始接入。换句话说，上述第一带宽部分分组可以包括用于接收系统消息的带宽部分和第一默认带宽部分，也可以包括用于初始接入的带宽部分和第一默认带宽部分，还可以上述三者都包括，本申请实施例对此不作限定。在本申请实施例中，第一带宽部分分组又可以称为主带宽部分分组。
本申请实施例的通信方法，通过网络设备确定多个带宽部分分组，并基于该多个带宽部分分组为终端配置第一默认带宽部分，以便终端能够根据网络设备的配置执行多个带宽部分的回退，即从已激活的带宽部分切换至该第一默认带宽部分，有利于节省终端设备的能耗，提高系统性能。
在本申请实施例中，网络设备可以通过多种方式为终端配置上述第一默认带宽部分， 本申请实施例对此不作限定。
作为一个可选的实施例，所述方法还包括：所述网络设备从所述第一带宽部分分组中选择一个下行带宽部分作为所述第一默认带宽部分。
具体地，在第一带宽部分分组是显式配置的情况下，网络设备可以先确定第一带宽部分分组，为终端配置该第一带宽部分分组，然后从该第一带宽部分分组中选择一个下行带宽部分作为上述第一默认带宽部分，即从主带宽部分分组中选择第一默认带宽部分，再将该第一默认带宽部分通过信令告知终端。
作为一个可选的实施例，所述方法还包括：所述网络设备从已配置的带宽部分中选择一个下行带宽部分作为所述第一默认带宽部分；所述网络设备确定多个带宽部分分组，包括：所述网络设备将所述第一默认带宽部分所属的带宽部分分组确定为所述第一带宽部分分组。
具体地，在第一带宽部分分组是隐式配置的情况下，网络设备可以先选择第一默认带宽部分，该第一默认带宽部分的可选集为已配置的带宽部分，然后，该网络设备可以将该第一默认带宽部分所在的带宽部分分组确定为第一带宽部分分组，该第一带宽部分分组即为主带宽部分分组。在这种情况下，可以通过协议规定默认带宽部分仅配置在主带宽部分分组中，终端可以根据网络设备的配置确定第一默认带宽部分，从而将该第一默认带宽部分所属的第一带宽部分分组确定为主带宽部分分组。
这种配置方法的一个典型应用场景是当初始接入带宽部分不属于任一个带宽部分分组时，可以通过这种配置方法确定主带宽部分分组。在主带宽部分分组动态切换之前，终端需要知道第一次传输在哪个带宽部分分组中。
作为一个可选的实施例，所述方法还包括：所述网络设备为所述终端配置第二默认带宽部分，所述多个带宽部分分组中的第二带宽部分分组包括所述第二默认带宽部分。
具体地，在网络设备配置了上述第一默认带宽部分的情况下，该网络设备还可以配置第二默认带宽部分，以便终端进行两级回退，即从已激活的第一带宽部分回退至第二默认带宽部分，再从第二默认带宽部分回退至第一默认带宽部分。该第二默认带宽部分的可选集为已配置的带宽部分分组。换句话说，已配置的带宽部分分组包括带宽部分分组1和带宽部分分组2，网络设备需要为带宽部分分组2配置第二默认带宽部分，则该网络设备可以从带宽部分分组2所包括的带宽部分中选择一个下行带宽部分作为该带宽部分分组2的第二默认带宽部分。
应理解，该第二默认带宽部分的个数可以为一个，也可以为多个，且该第二默认带宽部分属于上述多个带宽部分分组中的至少一个第二带宽部分分组中。在一种可能的实现方式中，有A个第二带宽部分分组，该A个第二带宽部分分组中的B个第二带宽部分分组可以包括第二默认带宽部分，且该B个第二带宽部分分组中的每个第二带宽部分分组均包括一个第二默认带宽部分，其中，B小于或等于A。例如，存在5个第二带宽部分分组，其中3个第二带宽部分分组分别有各自的一个第二默认带宽部分。又例如，存在5个第二带宽部分分组，该5个第二带宽部分分组中的每个第二带宽部分分组都有各自的一个第二默认带宽部分。
作为一个可选的实施例，包括所述第二默认带宽部分的第二带宽部分分组用于接收系统消息，和/或，用于初始接入。
作为一个可选的实施例，所述多个带宽部分分组中的第二带宽部分分组包括已激活的第一带宽部分。
上文详细介绍了本申请提供的通信方法示例。可以理解的是，终端和网络设备为了实现上述功能，其包含了执行各个功能相应的硬件结构和/或软件模块。本领域技术人员应该很容易意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，本申请能够以硬件或硬件和计算机软件的结合形式来实现。某个功能究竟以硬件还是计算机软件驱动硬件的方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
图4示出了本申请提供的装置400的结构示意图。该装置400包括：确定单元410和切换单元420。
确定单元410，用于确定已激活的第一带宽部分；
切换单元420，用于从所述第一带宽部分切换至第一默认带宽部分；
其中，所述第一默认带宽部分为第一带宽部分分组中的一个下行带宽部分，所述已激活的第一带宽部分属于第二带宽部分分组，且所述第一带宽部分分组用于接收系统消息，和/或，用于初始接入。
本申请实施例的装置，通过从已激活的带宽部分切换至默认带宽部分，实现了带宽部分的回退，有利于节省终端能耗，提高系统性能。
可选地，所述第二带宽部分分组中包括第二默认带宽部分；所述切换单元420具体用于：从所述第一带宽部分切换至所述第二默认带宽部分；从所述第二默认带宽部分切换至所述第一默认带宽部分。
可选地，所述切换单元420具体用于：当第一定时器期满时，从所述第一带宽部分切换至所述第一默认带宽部分。
可选地，所述切换单元420具体用于：当第二定时器的时长大于第一门限值时，从所述第一带宽部分切换至所述第二默认带宽部分；当所述第二定时器的时长大于第二门限值时，从所述第二默认带宽部分切换至所述第一默认带宽部分。
可选地，所述切换单元420具体用于：当第三定时器期满时，从所述第一带宽部分切换至所述第二默认带宽部分；当第四定时器期满时，从所述第二默认带宽部分切换至所述第一默认带宽部分。
装置400可以是通信设备(例如，终端)，也可以是通信设备内的芯片。当该通信装置是通信设备时，该处理单元可以是处理器，该发送单元和接收单元可以是收发器；该通信设备还可以包括存储单元，该存储单元可以是存储器；该存储单元用于存储指令，该处理单元执行该存储单元所存储的指令，以使该通信设备执行上述方法。当该通信装置是通信设备内的芯片时，该处理单元可以是处理器，该发送单元和接收单元可以是输入/输出接口、管脚或电路等；该处理单元执行存储单元所存储的指令，以使该通信设备执行上述终端所执行的相应步骤，该存储单元可以是该芯片内的存储单元(例如，寄存器、缓存等)，也可以是该通信设备内的位于该芯片外部的存储单元(例如，只读存储器、随机存取存储器等)
本领域技术人员可以清楚地了解到，当装置400为终端时，装置400所执行的步骤以 及相应的有益效果可以参考关于图2中终端的相关描述，为了简洁，在此不再赘述。
图5示出了本申请提供的装置500的结构示意图。该装置500包括：确定单元510和配置单元520。
确定单元510，用于确定多个带宽部分分组，所述多个带宽部分分组中的第一带宽部分分组包括第一默认带宽部分，所述第一带宽部分分组用于接收系统消息，和/或，用于初始接入；
配置单元520，用于为终端配置所述第一默认带宽部分。
本申请实施例的装置，通过网络设备确定多个带宽部分分组，并基于该多个带宽部分分组为终端配置第一默认带宽部分，以便终端能够根据网络设备的配置执行多个带宽部分的回退，即从已激活的多个带宽部分切换至该第一默认带宽部分，有利于节省终端设备的能耗，提高系统性能。
可选地，所述确定单元510还用于：从所述第一带宽部分分组中选择一个下行带宽部分作为所述第一默认带宽部分。
可选地，所述确定单元510还用于：从已配置的带宽部分中选择一个下行带宽部分作为所述第一默认带宽部分；将所述第一默认带宽部分所属的带宽部分分组确定为所述第一带宽部分分组。
可选地，所述配置单元520还用于：为所述终端配置第二默认带宽部分，所述多个带宽部分分组中的第二带宽部分分组包括所述第二默认带宽部分。
可选地，包括所述第二默认带宽部分的第二带宽部分分组用于接收系统消息，和/或，用于初始接入。
可选地，所述多个带宽部分分组中的第二带宽部分分组包括已激活的第一带宽部分。
装置500可以是通信设备(例如，网络设备)，也可以是通信设备内的芯片。当该通信装置是通信设备时，该处理单元可以是处理器，该发送单元和接收单元可以是收发器；该通信设备还可以包括存储单元，该存储单元可以是存储器；该存储单元用于存储指令，该处理单元执行该存储单元所存储的指令，以使该通信设备执行上述方法。当该通信装置是通信设备内的芯片时，该处理单元可以是处理器，该发送单元和接收单元可以是输入/输出接口、管脚或电路等；该处理单元执行存储单元所存储的指令，以使该通信设备执行上述网络设备所执行的相应步骤，该存储单元可以是该芯片内的存储单元(例如，寄存器、缓存等)，也可以是该通信设备内的位于该芯片外部的存储单元(例如，只读存储器、随机存取存储器等)
本领域技术人员可以清楚地了解到，当装置500为网络设备时，装置500所执行的步骤以及相应的有益效果可以参考关于图3中网络设备的相关描述，为了简洁，在此不再赘述。
应理解，上述各个单元的划分仅仅是功能上的划分，实际实现时可能会有其它的划分方法。
本领域的技术人员可以清楚地了解到，上述描述的装置和单元的具体工作过程以及执行步骤所产生的技术效果，可以参考前述对应的方法实施例中的描述，为了简洁，在此不再赘述。
上述通信装置可以是一个芯片，处理单元可以通过硬件来实现也可以通过软件来实 现，当通过硬件实现时，该处理单元可以是逻辑电路、集成电路等；当通过软件来实现时，该处理单元可以是一个通用处理器，通过读取存储单元中存储的软件代码来实现，该存储单元可以集成在处理器中，也可以位于所述处理器之外，独立存在。
下面以上述装置为终端或网络设备为例对本申请提供的装置做进一步描述。
图6为本申请提供的一种终端10的结构示意图。为了便于说明，图6仅示出了终端的主要部件。如图6所示，终端10包括处理器、存储器、控制电路、天线以及输入输出装置。
处理器主要用于对通信协议以及通信数据进行处理，以及对整个终端进行控制，执行软件程序，处理软件程序的数据，例如用于支持终端执行上述资源配置方法或者通信方法实施例中所描述的动作。存储器主要用于存储软件程序和数据。控制电路主要用于基带信号与射频信号的转换以及对射频信号的处理。控制电路和天线一起也可以叫做收发器，主要用于收发电磁波形式的射频信号。输入输出装置，例如触摸屏、显示屏，键盘等主要用于接收用户输入的数据以及对用户输出数据。
当终端开机后，处理器可以读取存储单元中的软件程序，解释并执行软件程序的指令，处理软件程序的数据。当需要通过无线发送数据时，处理器对待发送的数据进行基带处理后，输出基带信号至射频电路，射频电路将基带信号进行射频处理后将射频信号通过天线以电磁波的形式向外发送。当有数据发送到终端时，射频电路通过天线接收到射频信号，将射频信号转换为基带信号，并将基带信号输出至处理器，处理器将基带信号转换为数据并对该数据进行处理。
本领域技术人员可以理解，为了便于说明，图6仅示出了一个存储器和处理器。在实际的终端中，可以存在多个处理器和存储器。存储器也可以称为存储介质或者存储设备等，本申请实施例对此不做限制。
作为一种可选的实现方式，处理器可以包括基带处理器和中央处理器，基带处理器主要用于对通信协议以及通信数据进行处理，中央处理器主要用于对整个终端进行控制，执行软件程序，处理软件程序的数据。图6中的处理器集成了基带处理器和中央处理器的功能，本领域技术人员可以理解，基带处理器和中央处理器也可以是各自独立的处理器，通过总线等技术互联。本领域技术人员可以理解，终端可以包括多个基带处理器以适应不同的网络制式，终端可以包括多个中央处理器以增强其处理能力，终端的各个部件可以通过各种总线连接。所述基带处理器也可以表述为基带处理电路或者基带处理芯片。所述中央处理器也可以表述为中央处理电路或者中央处理芯片。对通信协议以及通信数据进行处理的功能可以内置在处理器中，也可以以软件程序的形式存储在存储单元中，由处理器执行软件程序以实现基带处理功能。
示例性的，在本申请实施例中，可以将具有收发功能的天线和控制电路视为终端10的收发单元101，将具有处理功能的处理器视为终端10的处理单元102。如图6所示，终端10包括收发单元101和处理单元102。收发单元也可以称为收发器、收发机、收发装置等。可选的，可以将收发单元101中用于实现接收功能的器件视为接收单元，将收发单元101中用于实现发送功能的器件视为发送单元，即收发单元101包括接收单元和发送单元。示例性的，接收单元也可以称为接收机、接收器、接收电路等，发送单元可以称为发射机、发射器或者发射电路等。
图6所示的终端可以执行上述方法中终端所执行的各动作，这里，为了避免赘述，省略其详细说明。
图7是本申请提供的一种网络设备的结构示意图，该网络设备例如可以为基站。如图7所示，该基站可应用于如图1所示的通信系统中，执行上述方法实施例中网络设备的功能。基站20可包括一个或多个射频单元，如远端射频单元(remote radio unit,RRU)201和一个或多个基带单元(baseband unit，BBU)(也可称为数字单元(digital unit，DU))202。所述RRU 201可以称为收发单元、收发机、收发电路、或者收发器等等，其可以包括至少一个天线2011和射频单元2012。所述RRU 201部分主要用于射频信号的收发以及射频信号与基带信号的转换，例如用于发送上述方法实施例中PDCCH和/或PDSCH。所述BBU 202部分主要用于进行基带处理，对基站进行控制等。所述RRU 201与BBU 202可以是物理上设置在一起，也可以物理上分离设置的，即分布式基站。
所述BBU 202为基站的控制中心，也可以称为处理单元，主要用于完成基带处理功能，如信道编码，复用，调制，扩频等等。例如所述BBU(处理单元)202可以用于控制基站执行上述方法实施例中关于网络设备的操作流程。
在一个实施例中，所述BBU 202可以由一个或多个单板构成，多个单板可以共同支持单一接入指示的无线接入网(如LTE网络)，也可以分别支持不同接入制式的无线接入网(如LTE网，5G网或其它网)。所述BBU 202还包括存储器2021和处理器2022，所述存储器2021用于存储必要的指令和数据。例如存储器2021存储上述方法实施例中的QCL信息或TCI状态。所述处理器2022用于控制基站进行必要的动作，例如用于控制基站执行上述方法实施例中关于网络设备的操作流程。所述存储器2021和处理器2022可以服务于一个或多个单板。也就是说，可以每个单板上单独设置存储器和处理器。也可以是多个单板共用相同的存储器和处理器。此外每个单板上还可以设置有必要的电路。
本申请还提供一种通信系统，其包括前述的一个或多个网络设备，和，一个或多个终端。
应理解，本申请实施例中的处理器可以是一种集成电路芯片，具有信号的处理能力。在实现过程中，上述方法实施例的各步骤可以通过处理器中的硬件的集成逻辑电路或者软件形式的指令完成。上述的处理器可以是通用处理器、数字信号处理器(digital signal processor，DSP)、专用集成电路(application specific integrated circuit，ASIC)、现场可编程门阵列(field programmable gate array，FPGA)或者其它可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件。可以实现或者执行本申请实施例中的公开的各方法、步骤及逻辑框图。通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。结合本申请各实施例所公开的方法的步骤可以直接体现为硬件译码处理器执行完成，或者用译码处理器中的硬件及软件模块组合执行完成。软件模块可以位于随机存储器，闪存、只读存储器，可编程只读存储器或者电可擦写可编程存储器、寄存器等本领域成熟的存储介质中。该存储介质位于存储器，处理器读取存储器中的信息，结合其硬件完成上述方法的步骤。
可以理解，本申请实施例中的存储器可以是易失性存储器或非易失性存储器，或可包括易失性和非易失性存储器两者。其中，非易失性存储器可以是只读存储器(read-only memory，ROM)、可编程只读存储器(programmable ROM，PROM)、可擦除可编程只 读存储器(erasable PROM，EPROM)、电可擦除可编程只读存储器(electrically EPROM，EEPROM)或闪存。易失性存储器可以是随机存取存储器(random access memory，RAM)，其用作外部高速缓存。通过示例性但不是限制性说明，许多形式的RAM可用，例如静态随机存取存储器(static RAM，SRAM)、动态随机存取存储器(dynamic RAM，DRAM)、同步动态随机存取存储器(synchronous DRAM，SDRAM)、双倍数据速率同步动态随机存取存储器(double data rate SDRAM，DDR SDRAM)、增强型同步动态随机存取存储器(enhanced SDRAM，ESDRAM)、同步连接动态随机存取存储器(synchlink DRAM，SLDRAM)和直接内存总线随机存取存储器(direct rambus RAM，DR RAM)。应注意，本文描述的系统和方法的存储器旨在包括但不限于这些和任意其它适合类型的存储器。
本申请还提供了一种计算机可读介质，其上存储有计算机程序，该计算机程序被计算机执行时实现上述任一方法实施例的功能。
本申请还提供了一种计算机程序产品，该计算机程序产品被计算机执行时实现上述任一方法实施例的功能。
在上述实施例中，可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件实现时，可以全部或部分地以计算机程序产品的形式实现。所述计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行所述计算机指令时，全部或部分地产生按照本申请实施例所述的流程或功能。所述计算机可以是通用计算机、专用计算机、计算机网络、或者其他可编程装置。所述计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，所述计算机指令可以从一个网站站点、计算机、服务器或数据中心通过有线(例如同轴电缆、光纤、数字用户线(digital subscriber line，DSL))或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包含一个或多个可用介质集成的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质(例如，软盘、硬盘、磁带)、光介质(例如，高密度数字视频光盘(digital video disc，DVD))、或者半导体介质(例如，固态硬盘(solid state disk，SSD))等。
应理解，说明书通篇中提到的“实施例”意味着与实施例有关的特定特征、结构或特性包括在本申请的至少一个实施例中。因此，在整个说明书各个实施例未必一定指相同的实施例。此外，这些特定的特征、结构或特性可以任意适合的方式结合在一个或多个实施例中。应理解，在本申请的各种实施例中，上述各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本申请实施例的实施过程构成任何限定。
还应理解，在本申请中，“当…时”、“若”以及“如果”均指在某种客观情况下UE或者基站会做出相应的处理，并非是限定时间，且也不要求UE或基站实现时一定要有判断的动作，也不意味着存在其它限定。
另外，本文中术语“系统”和“网络”在本文中常被可互换使用。本文中术语“和/或”，仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。
本文中术语“……中的至少一个”或“……中的至少一种”，表示所列出的各项的全 部或任意组合，例如，“A、B和C中的至少一种”，可以表示：单独存在A，单独存在B，单独存在C，同时存在A和B，同时存在B和C，同时存在A、B和C这六种情况。
应理解，在本申请各实施例中，“与A相应的B”表示B与A相关联，根据A可以确定B。但还应理解，根据A确定B并不意味着仅仅根据A确定B，还可以根据A和/或其它信息确定B。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、计算机软件或者二者的结合来实现，为了清楚地说明硬件和软件的可互换性，在上述说明中已经按照功能一般性地描述了各示例的组成及步骤。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
通过以上的实施方式的描述，所属领域的技术人员可以清楚地了解到本申请可以用硬件实现，或固件实现，或它们的组合方式来实现。当使用软件实现时，可以将上述功能存储在计算机可读介质中或作为计算机可读介质上的一个或多个指令或代码进行传输。计算机可读介质包括计算机存储介质和通信介质，其中通信介质包括便于从一个地方向另一个地方传送计算机程序的任何介质。存储介质可以是计算机能够存取的任何可用介质。以此为例但不限于：计算机可读介质可以包括RAM、ROM、EEPROM、CD-ROM或其他光盘存储、磁盘存储介质或者其他磁存储设备、或者能够用于携带或存储具有指令或数据结构形式的期望的程序代码并能够由计算机存取的任何其他介质。此外。任何连接可以适当的成为计算机可读介质。例如，如果软件是使用同轴电缆、光纤光缆、双绞线、数字用户线(DSL)或者诸如红外线、无线电和微波之类的无线技术从网站、服务器或者其他远程源传输的，那么同轴电缆、光纤光缆、双绞线、DSL或者诸如红外线、无线和微波之类的无线技术包括在所属介质的定影中。如本申请所使用的，盘(disk)和碟(disc)包括压缩光碟(CD)、激光碟、光碟、数字通用光碟(DVD)、软盘和蓝光光碟，其中盘通常使用磁性来复制数据，而碟则使用激光来复制数据。上面的组合也应当包括在计算机可读介质的保护范围之内。
总之，以上所述仅为本申请技术方案的较佳实施例而已，并非用于限定本申请的保护范围。凡在本申请的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本申请的保护范围之内。

Claims (26)

  1. 一种通信方法，其特征在于，包括：
    终端确定已激活的第一带宽部分；
    所述终端从所述第一带宽部分切换至第一默认带宽部分；
    其中，所述第一默认带宽部分为第一带宽部分分组中的一个下行带宽部分，所述已激活的第一带宽部分属于第二带宽部分分组，且所述第一带宽部分分组用于接收系统消息，和/或，用于初始接入。
  2. 根据权利要求1所述的方法，其特征在于，所述第二带宽部分分组中包括第二默认带宽部分；
    所述终端从所述第一带宽部分切换至第一默认带宽部分，包括：
    所述终端从所述第一带宽部分切换至所述第二默认带宽部分；
    所述终端从所述第二默认带宽部分切换至所述第一默认带宽部分。
  3. 根据权利要求1所述的方法，其特征在于，所述终端从所述第一带宽部分切换至第一默认带宽部分，包括：
    当第一定时器期满时，所述终端从所述第一带宽部分切换至所述第一默认带宽部分。
  4. 根据权利要求2所述的方法，其特征在于，所述终端从所述第一带宽部分切换至第一默认带宽部分，包括：
    当第二定时器的时长大于第一门限值时，所述终端从所述第一带宽部分切换至所述第二默认带宽部分；
    当所述第二定时器的时长大于第二门限值时，所述终端从所述第二默认带宽部分切换至所述第一默认带宽部分。
  5. 根据权利要求2所述的方法，其特征在于，所述终端从所述第一带宽部分切换至所述第二默认带宽部分，包括：
    当第三定时器期满时，所述终端从所述第一带宽部分切换至所述第二默认带宽部分；
    所述终端从所述第二默认带宽部分切换至所述第一默认带宽部分，包括：
    当第四定时器期满时，所述终端从所述第二默认带宽部分切换至所述第一默认带宽部分。
  6. 一种通信方法，其特征在于，包括：
    网络设备确定多个带宽部分分组，所述多个带宽部分分组中的第一带宽部分分组包括第一默认带宽部分，所述第一带宽部分分组用于接收系统消息，和/或，用于初始接入；
    所述网络设备为终端配置所述第一默认带宽部分。
  7. 根据权利要求6所述的方法，其特征在于，所述方法还包括：
    所述网络设备从所述第一带宽部分分组中选择一个下行带宽部分作为所述第一默认带宽部分。
  8. 根据权利要求6所述的方法，其特征在于，所述方法还包括：
    所述网络设备从已配置的带宽部分中选择一个下行带宽部分作为所述第一默认带宽部分；
    所述网络设备确定多个带宽部分分组，包括：
    所述网络设备将所述第一默认带宽部分所属的带宽部分分组确定为所述第一带宽部分分组。
  9. 根据权利要求6至8中任一项所述的方法，其特征在于，所述方法还包括：
    所述网络设备为所述终端配置第二默认带宽部分，所述多个带宽部分分组中的第二带宽部分分组包括所述第二默认带宽部分。
  10. 根据权利要求9所述的方法，其特征在于，包括所述第二默认带宽部分的第二带宽部分分组用于接收系统消息，和/或，用于初始接入。
  11. 根据权利要求9或10所述的方法，其特征在于，所述多个带宽部分分组中的第二带宽部分分组包括已激活的第一带宽部分。
  12. 一种装置，其特征在于，包括：
    确定单元，用于确定已激活的第一带宽部分；
    切换单元，用于从所述第一带宽部分切换至第一默认带宽部分；
    其中，所述第一默认带宽部分为第一带宽部分分组中的一个下行带宽部分，所述已激活的第一带宽部分属于第二带宽部分分组，且所述第一带宽部分分组用于接收系统消息，和/或，用于初始接入。
  13. 根据权利要求12所述的装置，其特征在于，所述第二带宽部分分组中包括第二默认带宽部分；
    所述切换单元具体用于：
    从所述第一带宽部分切换至所述第二默认带宽部分；
    从所述第二默认带宽部分切换至所述第一默认带宽部分。
  14. 根据权利要求12所述的装置，其特征在于，所述切换单元具体用于：
    当第一定时器期满时，从所述第一带宽部分切换至所述第一默认带宽部分。
  15. 根据权利要求13所述的装置，其特征在于，所述切换单元具体用于：
    当第二定时器的时长大于第一门限值时，从所述第一带宽部分切换至所述第二默认带宽部分；
    当所述第二定时器的时长大于第二门限值时，从所述第二默认带宽部分切换至所述第一默认带宽部分。
  16. 根据权利要求13所述的装置，其特征在于，所述切换单元具体用于：
    当第三定时器期满时，从所述第一带宽部分切换至所述第二默认带宽部分；
    当第四定时器期满时，从所述第二默认带宽部分切换至所述第一默认带宽部分。
  17. 一种装置，其特征在于，包括：
    确定单元，用于确定个带宽部分分组，所述多个带宽部分分组中的第一带宽部分分组包括第一默认带宽部分，所述第一带宽部分分组用于接收系统消息，和/或，用于初始接入；
    配置单元，用于为终端配置所述第一默认带宽部分。
  18. 根据权利要求17所述的装置，其特征在于，所述确定单元还用于：
    从所述第一带宽部分分组中选择一个下行带宽部分作为所述第一默认带宽部分。
  19. 根据权利要求17所述的装置，其特征在于，所述确定单元还用于：
    从已配置的带宽部分中选择一个下行带宽部分作为所述第一默认带宽部分；
    将所述第一默认带宽部分所属的带宽部分分组确定为所述第一带宽部分分组。
  20. 根据权利要求17至19中任一项所述的装置，其特征在于，所述配置单元还用于：
    为所述终端配置第二默认带宽部分，所述多个带宽部分分组中的第二带宽部分分组包括所述第二默认带宽部分。
  21. 根据权利要求20所述的装置，其特征在于，包括所述第二默认带宽部分的第二带宽部分分组用于接收系统消息，和/或，用于初始接入。
  22. 根据权利要求20或21所述的装置，其特征在于，所述多个带宽部分分组中的第二带宽部分分组包括已激活的第一带宽部分。
  23. 一种装置，其特征在于，包括：处理器、存储器以及存储在存储器上并可在处理器上运行的指令，当所述指令被运行时，使得所述装置执行权利要求1至11中任一项所述的方法。
  24. 一种通信系统，其特征在于，包括：权利要求12至16中任一项所述的装置以及权利要求17至22中任一项所述的装置。
  25. 一种计算机可读存储介质，其特征在于，包括指令，当其在计算机上运行时，使得计算机执行权利要求1至11中任一项所述的方法。
  26. 一种计算机程序产品，其特征在于，当其在计算机上运行时，使得计算机执行权利要求1至11中任一项所述的方法。
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