CN111373802A - Communication method and communication device - Google Patents

Communication method and communication device Download PDF

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Publication number
CN111373802A
CN111373802A CN201780096864.XA CN201780096864A CN111373802A CN 111373802 A CN111373802 A CN 111373802A CN 201780096864 A CN201780096864 A CN 201780096864A CN 111373802 A CN111373802 A CN 111373802A
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cell
transmission bandwidth
slave
slave cell
determining
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CN111373802B (en
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徐夏刚
杨涛
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Alcatel Lucent SAS
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Alcatel Lucent SAS
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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
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • 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

Abstract

Embodiments of the present disclosure relate to a communication method and a communication apparatus. There is provided a communication method implemented at a network device, comprising: determining a configuration of an operational state for a slave cell of the network device in response to a handover of a transmission bandwidth of a master cell of the network device, the transmission bandwidth of the master cell being a bandwidth used by the master cell for communicating with the terminal device; and transmitting the configuration to the terminal device to cause the terminal device to determine an operating state of the slave cell based on the configuration. A communication method implemented at the terminal device is also provided, as well as a corresponding terminal device and network device.

Description

Communication method and communication device Technical Field
Embodiments of the present disclosure relate generally to communication technology, and more particularly, to a communication method implemented at a communication device and a corresponding communication device.
Background
In order to meet the requirements of increasing the transmission rate and the system capacity, Carrier Aggregation (CA) is introduced into the existing communication technology to increase the system transmission bandwidth. The Carrier aggregation technology can aggregate a plurality of Component Carriers (CCs) together, and realize a large (e.g., 100MHz) transmission bandwidth, thereby effectively improving the uplink and downlink transmission rate and the system capacity. In general, a primary cell (PCell) is a cell operating on a primary CC, and a secondary cell (SCell) is a cell operating on a secondary CC. If carrier aggregation is not configured, only one serving cell, namely a primary cell, is available; the serving cell includes a master cell and a slave cell if carrier aggregation is configured.
According to the current communication technology, a Bandwidth Part (BWP) concept has been proposed for a transmission Bandwidth of a master cell or a slave cell. In general, BWP is different from the total bandwidth of a cell, but indicates a portion of the total bandwidth of the cell, which is the portion of the bandwidth actually detected by the receiver on the radio frequency.
Typically, the default BWP configured for the master cell or the slave cell is small relative to the configured normal BWP. This configuration is instead mandatory for the primary cell and optional for the secondary cell. Further, the switching of the default BWP with the normal BWP may be performed based on a timer, thereby facilitating power consumption savings. For example, the timer starts/restarts when a downlink control channel (PDCCH) is decoded for data transmission; if the timer expires, the transmission bandwidth is switched to the default BWP.
The main purpose of such timer-triggered switching to the default BWP is to save power consumption. With respect to the primary cell timer expiration, there are two main potential scenarios: scene 1: no data transmission or only small data transmission is needed, so that broadband radio frequency receiving/sending is not needed to be carried out continuously, and power consumption can be saved; and scenario 2: there is data to transmit, but the network side wants to offload traffic to the secondary cell instead of the primary cell.
For the network side, in order to save power consumption and meet the data transmission requirements, it is necessary to identify and distinguish these different scenarios, and make corresponding decisions on the configuration of the slave cell, so as to guide the behavior of the terminal device. However, currently the primary and secondary cell timer operations are completely independent. Even if the master cell timer expires for power saving purposes, the slave cell may still be in an operating state and may operate with a larger bandwidth, which may not achieve the effect of saving power consumption.
Disclosure of Invention
In general, embodiments of the present disclosure propose a communication method implemented at a communication device and a corresponding communication device, which can adjust the configuration of a slave cell based on a transmission bandwidth switch of a master cell, thereby being able to both meet data transmission requirements and achieve energy saving effects.
In a first aspect, embodiments of the present disclosure provide a communication method implemented at a network device. The method comprises the following steps: determining a configuration of an operational state for a slave cell of the network device in response to a handover of a transmission bandwidth of a master cell of the network device, the transmission bandwidth of the master cell being a bandwidth used by the master cell for communicating with the terminal device; and transmitting the configuration to the terminal device to cause the terminal device to determine an operating state of the slave cell based on the configuration.
In this regard, embodiments of the present disclosure also provide a network device for communicating, including: a controller configured to determine a configuration for an operating state of a slave cell of the network device in response to a handover of a transmission bandwidth of a master cell of the network device, the transmission bandwidth of the master cell being a bandwidth used by the master cell to communicate with the terminal device; and a transceiver configured to transmit the configuration to the terminal device, such that the terminal device determines an operating state of the slave cell based on the configuration.
Embodiments of the present disclosure also include a network device for communication. The network device includes: a processor and a memory storing instructions that, when executed by the processor, cause the network device to perform the method according to the first aspect.
Embodiments of the present disclosure also include a network device for communicating. The network device includes: means for determining a configuration of an operating state for a slave cell of the network device in response to a handover of a transmission bandwidth of a master cell of the network device, the transmission bandwidth of the master cell being a bandwidth used by the master cell for communicating with the terminal device; and means for transmitting the configuration to the terminal device, such that the terminal device determines an operating state of the slave cell based on the configuration.
In a second aspect, embodiments of the present disclosure provide a communication method implemented at a terminal device. The method comprises the following steps: receiving, from the network device, a configuration of an operational state of a secondary cell of the network device, the configuration being determined by the network device in response to a handover of a transmission bandwidth of a primary cell of the network device, the transmission bandwidth of the primary cell being a bandwidth used by the primary cell to communicate with the terminal device; and determining an operating state of the slave cell based on the configuration.
In this regard, embodiments of the present disclosure also provide a terminal device for communication. The terminal device includes: a transceiver configured to receive from a network device a configuration for an operational state of a secondary cell of the network device, the configuration being determined by the network device in response to a handover of a transmission bandwidth of a primary cell of the network device, the transmission bandwidth of the primary cell being a bandwidth used by the primary cell to communicate with a terminal device; and a controller configured to determine an operation state of the slave cell based on the configuration.
Embodiments of the present disclosure also include a terminal device for communication. The terminal device includes: a processor and a memory storing instructions that, when executed by the processor, cause the terminal device to perform the method according to the second aspect.
Embodiments of the present disclosure also include a terminal device for communication. The terminal device includes: means for receiving from the network device a configuration of an operational status of a secondary cell for the network device, the configuration being determined by the network device in response to a handover of a transmission bandwidth of a primary cell of the network device, the transmission bandwidth of the primary cell being a bandwidth used by the primary cell to communicate with the terminal device; and means for determining an operating state of the slave cell based on the configuration.
It should be understood that the statements herein reciting aspects are not intended to limit the critical or essential features of the embodiments of the present disclosure, nor are they intended to limit the scope of the present disclosure. Other features of the present disclosure will become apparent from the following description.
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The above and other features, advantages and aspects of various embodiments of the present disclosure will become more apparent by referring to the following detailed description when taken in conjunction with the accompanying drawings. In the drawings, like or similar reference characters designate like or similar elements, and wherein:
FIG. 1 illustrates an example communication network in which embodiments of the present disclosure may be implemented;
fig. 2 illustrates a flow diagram of a method implemented at the network device side, in accordance with certain embodiments of the present disclosure;
fig. 3 illustrates a flow diagram of a method implemented at the network device side, in accordance with certain embodiments of the present disclosure;
fig. 4 illustrates a flow diagram of a method implemented at the network device side, in accordance with certain embodiments of the present disclosure;
fig. 5 illustrates a flow chart of a method implemented at a terminal device side according to some embodiments of the present disclosure; and
fig. 6 illustrates a block diagram of an apparatus in accordance with certain embodiments of the present disclosure.
Detailed Description
Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While certain embodiments of the present disclosure are shown in the drawings, it is to be understood that the present disclosure may be embodied in various forms and should not be construed as limited to the embodiments set forth herein, but rather are provided for a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the disclosure are for illustration purposes only and are not intended to limit the scope of the disclosure.
According to embodiments of the present disclosure, a "network device" refers to a base station or other entity or node having a particular function in a communication network. A "base station" (BS) may represent a node B (NodeB or NB), an evolved node B (eNodeB or eNB), a gNB, a Remote Radio Unit (RRU), a Radio Head (RH), a Remote Radio Head (RRH), a relay, or a low power node such as a pico base station, a femto base station, or the like. In the context of the present disclosure, the terms "network device" and "base station" may be used interchangeably for purposes of discussion convenience, and may primarily be referred to as an eNB as an example of a network device.
The term "terminal device" as used herein refers to any terminal device capable of wireless communication with a base station or with each other. As an example, the terminal device may include a User Equipment (UE), a terminal device (MT), a Subscriber Station (SS), a Portable Subscriber Station (PSS), a Mobile Station (MS), or an Access Terminal (AT), and the above-described devices in a vehicle. In the context of the present disclosure, the terms "terminal device" and "UE" may be used interchangeably for purposes of discussion convenience.
The term "transmission bandwidth" as used herein refers to the portion of the bandwidth that the receiver really detects on radio frequencies, e.g., BWP. The term "primary cell timer" as used herein, also referred to as "transmission bandwidth timer of the primary cell", is used to control handover between a normal BWP pre-configured for the primary cell and a default BWP. In the embodiment of the present disclosure, a default BWP and one or more normal BWPs may be pre-configured for the primary cell, where the default BWP may be a smaller bandwidth and the normal BWP may be a bandwidth used by the primary cell to operate normally. The normal BWP may be a larger bandwidth than the default BWP, but may also be smaller or equal to the default BWP. Furthermore, a default BWP and one or more normal BWPs may also be preconfigured for the slave cell, where the relationship between the default BWP and the normal BWP is similar to the above.
Specifically, when the transmission bandwidth timer of the primary cell expires (or times out), the transmission bandwidth of the primary cell (e.g., the BWP currently used by the primary cell) is switched to a default BWP pre-configured for the primary cell.
The term "slave cell timer" used herein is also referred to as "transmission bandwidth timer of a slave cell" for controlling handover between a normal BWP pre-configured for the slave cell and a default BWP. Specifically, when the transmission bandwidth timer of the slave cell expires (or times out), the transmission bandwidth of the slave cell is switched from (e.g., from the BWP currently used by) to the default BWP pre-configured for the slave cell.
The term "deactivation timer of a slave cell" is used herein to control the activation state and/or deactivation state of the slave cell. Specifically, when the deactivation timer of the slave cell expires or is stopped, the slave cell is switched to a deactivated (deactivation) state. It should be appreciated that a slave cell being in a "deactivated (also referred to as" deactivated "or" deactivated ") state indicates that the slave cell is not activated, i.e., not in an activated state.
The terms "include" or "comprise," and variations thereof, as used herein, are inclusive, i.e., "including but not limited to. The term "based on" is "based, at least in part, on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment". Relevant definitions for other terms will be given in the following description.
As described above, in the existing technical solution, the transmission bandwidth timer of the master cell and the transmission bandwidth timer of the slave cell are independent. Even if the transmission bandwidth timer of the master cell expires for power saving purposes, the slave cell may still be in an active state and may operate with a large BWP, which does not meet the requirement of saving power consumption.
To address these and other potential problems, embodiments of the present disclosure provide a method of communication. According to the method of an embodiment of the present disclosure, a network device determines a configuration for an operation state of its slave cell in response to a handover of a transmission bandwidth of its master cell, and transmits the configuration to a terminal device. The terminal device then determines an operating state of the slave cell based on the received configuration. In this way, the network device can configure the behavior of the slave cell according to the switching of the transmission bandwidth of the master cell, and notify the terminal device of this configuration. Therefore, the energy-saving effect can be improved while the data transmission requirement is met, and the system performance is improved.
Fig. 1 illustrates an example communication network 100 in which embodiments of the present disclosure may be implemented. Communication network 100 includes network device 110 and terminal device 120 in communication therewith. By way of example only, the network device 110 of fig. 1 has a primary cell 101 and one secondary cell 102. It should be understood that this is merely illustrative and that network device 110 may have multiple slave cells in embodiments consistent with the present disclosure. In the example of fig. 1, terminal device 120 communicates with the master cell 101 on the master CC and optionally communicates with the slave cell 102 on the slave CC.
In the example of fig. 1, communications in communication network 100 may be implemented in accordance with any suitable communication protocol, including, but not limited to, first-generation (1G), second-generation (2G), third-generation (3G), fourth-generation (4G), and fifth-generation (5G) cellular communication protocols, wireless local area network communication protocols such as Institute of Electrical and Electronics Engineers (IEEE)802.11, and/or any other protocol now known or later developed. Moreover, the communication may utilize any suitable wireless communication technique including, but not limited to, Code Division Multiple Access (CDMA), Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA), Frequency Division Duplex (FDD), Time Division Duplex (TDD), Multiple Input Multiple Output (MIMO), orthogonal frequency division multiple access (OFDM), and/or any other technique now known or later developed.
It should be understood that the number of network devices, the number of terminal devices, the number of primary cells and secondary cells shown in fig. 1 are for illustration purposes only and are not intended to be limiting. Communication network 100 may include any suitable type and number of network devices and cells, each network device may provide suitable range and suitable number of coverage, and communication network 100 may also include any suitable type and number of terminal devices.
The principles and specific embodiments of the present disclosure will be described in detail below with reference to fig. 2 through 6 from the perspective of a network device and a terminal device, respectively. Referring first to fig. 2, a flow diagram of a method 200 implemented at a terminal device side is shown, in accordance with certain embodiments of the present disclosure. It is to be appreciated that method 200 may be implemented, for example, at network device 110 as shown in fig. 1.
The method 200 begins at block 210, where the network device 110 determines a configuration of an operational state of the slave cell 102 for the network device 110 in response to a handover of a transmission bandwidth of its master cell 101. The transmission bandwidth of the primary cell 101 is the bandwidth used by the primary cell 101 for communication with the terminal device 120.
In some embodiments, the switching of the transmission bandwidth of the primary cell 101 may be the switching of the transmission bandwidth of the primary cell to a default transmission bandwidth pre-configured for the primary cell, e.g. the switching of the BWP used by the primary cell 101 to its default BWP. Additionally or alternatively, in some embodiments, the handover may also be a handover of the transmission bandwidth of the primary cell to a normal transmission bandwidth pre-configured for the primary cell, e.g. the primary cell 101 switches from its default BWP to its normal BWP.
According to an embodiment of the present disclosure, the above-mentioned switching of the transmission bandwidth of the primary cell 101 may be determined in various ways (e.g., occurrence of a predefined event). For example, if the transmission bandwidth timer of the primary cell 101 expires, it may be determined that the transmission bandwidth of the primary cell 101 is switched to a default transmission bandwidth preconfigured for the primary cell. Additionally or alternatively, if the load of the primary cell 101 exceeds a threshold load, e.g. a large amount of data needs to be transmitted or a larger number of terminal devices are served, it may be determined that the transmission bandwidth of the primary cell 101 is switched to a normal transmission bandwidth pre-configured for the primary cell 101.
According to embodiments of the present disclosure, the switching of the transmission bandwidth of the primary cell 101 may trigger multiple operating states of the secondary cell 102. Such operating states are for example, but not limited to: an active state; a deactivated state; active state and the transmission bandwidth is switched to a default transmission bandwidth; an active state and a transmission bandwidth is switched to a normal transmission bandwidth pre-configured for the slave cell; and so on.
For example, in some embodiments, when the transmission bandwidth timer of the primary cell 101 times out or expires for power saving purposes, the primary cell 101 will switch to the default BWP. The transmission bandwidth timer and corresponding default BWP of the slave cell 102 are optional for the slave cell 102. The slave cell 102 may have two timers: a transmission bandwidth timer of the slave cell 102 for controlling a handover between the normal broadband BWP and the narrowband BWP; and a deactivation timer of the slave cell 102 for controlling an activation/deactivation state of the slave cell 102. In these embodiments, for a normally configured slave cell 102, when the transmission bandwidth timer expiration event of the master cell 101 occurs, there may be three operating states: state 1: the slave cell 102 is in a normal operation state, and the deactivation timer and the transmission bandwidth timer thereof are both in an operation state; state 2: the slave cell is operating in the default BWP mode, the slave cell 102 deactivation timer is still running, and the slave cell 102 transmission bandwidth timer has expired; and state 3: the slave cell 102 is in an inactive state without any timer running.
It should be understood that the above-described operating states are exemplary only, and are intended to be illustrative only and not limiting. It is within the scope of the present disclosure that the slave cell may have any other suitable operating state.
According to embodiments of the present disclosure, the configuration for the operating state of the slave cell 102 may be determined in a variety of ways. Fig. 3 illustrates a flow diagram of a method 300 of determining a configuration of an operational state of a slave cell in accordance with certain embodiments of the present disclosure. It should be understood that the embodiment shown in fig. 3 is one implementation of block 210 shown in fig. 2, which is merely exemplary and not limiting. The embodiment of fig. 3 may be performed, for example, by network device 110 shown in fig. 1.
At block 310, information associated with a transmission bandwidth of the slave cell 102 is determined in response to determining that the transmission bandwidth of the master cell 101 switches to a default transmission bandwidth preconfigured for the master cell 101. At block 320, in response to the transmission bandwidth of the slave cell 102 being for the normal transmission bandwidth preconfigured from the cell 102, the transmission bandwidth of the slave cell 102 is switched to a default transmission bandwidth preconfigured for the slave cell 102. At block 330, the slave cell 102 is set to a deactivated state in response to the default transmission bandwidth of the slave cell 102 not being configured, the transmission bandwidth timer of the slave cell 102 also not being configured, and the deactivation timer of the slave cell 102 not having expired.
As another alternative, in other embodiments of the present disclosure, the network device 110 may further set the slave cell 102 to the deactivated state in response to determining that the transmission bandwidth of the master cell 102 is switched to a default transmission bandwidth preconfigured for the master cell 101. In these embodiments, the deactivation timer for the slave cell 102 may be stopped.
As yet another alternative, fig. 4 illustrates a flow chart of a method 400 of determining a configuration of an operating state of a slave cell in accordance with certain embodiments of the present disclosure. It should be understood that the embodiment shown in fig. 4 is one implementation of block 210 shown in fig. 2, which is merely exemplary and not limiting. The embodiment of fig. 4 may be performed, for example, by network device 110 shown in fig. 1.
At block 410, it is determined whether the slave cell 102 is in a deactivated state in response to determining that the transmission bandwidth of the primary cell 101 is switched to a normal transmission bandwidth preconfigured for the primary cell 101. At block 420, the slave cell 102 is activated in response to determining that the slave cell 102 is in the deactivated state. In this way, the slave cell 102 may be in an active state. At block 430, in response to determining that the secondary cell 102 is in the active state, it is determined whether the transmission bandwidth of the secondary cell 102 is a default transmission bandwidth preconfigured for the secondary cell 102. At block 440, in response to determining that the transmission bandwidth from the cell 102 is a default transmission bandwidth preconfigured for the cell 102, the transmission bandwidth from the cell 102 is switched to a normal transmission bandwidth preconfigured for the cell 102.
It should be appreciated that the above discussed embodiments of configurations for determining the operational state of the slave cell 102 are exemplary only and are not intended to be limiting. Those skilled in the art may employ other suitable implementations within the scope of the present disclosure to determine this configuration.
With continued reference to fig. 2, at block 220, network device 110 sends the determined configuration to terminal device 120 to cause terminal device 120 to determine an operating state of slave cell 102 based on the configuration. Network device 110 may transmit the configuration determined at block 210 using higher layer signaling, such as Radio Resource Control (RRC) signaling, and may also use L1 layer signaling, such as downlink control (PDCCH). For example, network device 110 may send radio resource control signaling or downlink control signaling including the configuration to terminal device 120.
In some embodiments, network device 110 employs higher layer signaling. For example, when network device 110 configures slave cell 102 through an RRC procedure, when the transmission bandwidth timer of master cell 101 expires, network device 110 may send the configuration to terminal device 120 in RRC signaling to direct UE behavior on slave cell 102.
Alternatively, in some embodiments, network device 110 may employ L1 signaling to send the configuration. This may be particularly advantageous for situations where the master cell 101 is operating in a normal BWP, but the network device 110 may need to immediately switch traffic to the slave cell 102. In these embodiments, network device 110 may send Downlink Control Information (DCI) such that it is possible for the transmission bandwidth of primary cell 101 to switch to its default BWP before its transmission bandwidth timer expires. For this case, network device 110 may include an indication in the DCI to ensure that at least one slave cell is operating properly.
Upon receiving the signaling from network device 110, terminal device 120 may extract the configuration of the operating state of slave cell 102 from the signaling and determine the operating state of slave cell 102 based on the configuration. By configuring the behavior of the slave cell 102 according to the switching of the transmission bandwidth of the master cell 101 by the network device 110 and notifying the terminal device 120 of such configuration, it is possible to improve the energy saving effect while satisfying the data transmission requirement, thereby improving the system performance.
Fig. 5 illustrates a flow chart of a method 500 implemented at the terminal device side according to some embodiments of the present disclosure. It is to be appreciated that method 500 can be implemented, for example, at terminal device 120 as shown in fig. 1.
Method 500 begins at block 510, where terminal device 120 receives a configuration of an operational state of slave cell 102 for network device 110 from a network device. The configuration is determined by the network device 110 in response to a handover of the transmission bandwidth of the primary cell 101 of the network device 110, e.g. according to the embodiments discussed above with respect to fig. 2-4. The transmission bandwidth of the primary cell 101 is the bandwidth used by the primary cell 101 for communication with the terminal device 120.
According to some embodiments of the present disclosure, the terminal device 120 may receive the above-described configuration from radio resource control signaling or downlink control signaling. It should be understood that this is merely exemplary and not limiting, and that other suitable ways to transmit the configuration for the operating state of the slave cell 102 from the network device 110 to the terminal device 120 may also be employed within the scope of embodiments of the present disclosure.
At block 520, the terminal device 120 determines an operational state of the slave cell 102 based on the configuration. According to an embodiment of the present disclosure, based on the received configuration, the terminal device 120 may determine that the slave cell 102 is set to the active state; determining that the slave cell 102 is set to a deactivated state; determining that the slave cell 102 is in an active state and that the transmission bandwidth of the slave cell 102 is switched to a default transmission bandwidth preconfigured for the slave cell 102; determining that the slave cell 102 is in an active state and the transmission bandwidth of the slave cell 102 is switched to a normal transmission bandwidth preconfigured for the slave cell 102; and/or other states of the slave cell 102.
In this way, the terminal device 120 can learn about the operating state of the slave cell 102 caused by the change in the behavior of the master cell 101, so that data transmission with the master cell and the slave cell can be achieved through a variety of different options. The data transmission can meet the transmission requirement and improve the energy-saving efficiency, thereby effectively improving the system performance.
Embodiments of the present disclosure are further described below by way of more detailed examples. It should be understood that the following examples are for illustrative purposes only and are not intended to limit the scope of the present disclosure in any way.
In some embodiments, the switching of the transmission bandwidth (e.g., BWP) of the primary cell between the default BWP and the normal BWP has 3 potential application scenarios as follows.
Scene 1: no data transmission or only small data transmission, only the default BWP of the primary cell can meet the transmission requirements.
Scene 2: there is a large amount of data to transmit, but in some cases (e.g., when the primary cell is overloaded), the network device (e.g., the gNB) may wish to offload these traffic loads to the secondary cell rather than using only the primary cell to transmit the data.
Scene 3: there is a large amount of data to be transmitted and the primary cell switches to its normal BWP to complete such data transmission.
With respect to scenario 1, when the default BWP of the primary cell can meet the data transmission requirement, then no data transmission is needed from the secondary cell, otherwise power is wasted and the secondary cell cannot be optimally maintained at the normal BWP of the secondary cell. That is, for scenario 1, moving from cell to narrowband default BWP, or deactivating from cell, more power may be saved.
With regard to scenario 2, although the primary cell is in a good radio channel state, the gNB wishes to schedule most of the data on the secondary cell rather than on the primary cell. The primary cell will then switch to its default BWP (which is typically a narrower bandwidth) to save power. On the other hand, it is necessary to ensure that at least one slave cell will operate in normal broadband conditions to transmit buffered data. But if all slave cells are in an inactive state or in a default BWP state, it is necessary to ensure that at least one slave cell is in a normal broadband state. This may result in additional DL signaling if Downlink (DL) signaling (L1/L2 layer signaling) is directly sent to activate the slave cell when the master cell timer expires. According to embodiments of the present disclosure, a primary cell timer expiration event may be caused to automatically start (restart) a timer of a secondary cell, which advantageously avoids incurring additional signaling overhead.
Additionally, with respect to scenario 3, where a large amount of data is waiting to be transmitted. For example, by scheduling DCI signaling, the gNB may trigger the BWP of the primary cell to switch to its normal BWP. In this case, the slave cell will also be active so that data can be transmitted immediately. That is, the handover of the primary cell to the normal BWP may automatically activate the secondary cell.
According to the embodiment of the disclosure, the network device can identify and distinguish the 3 scenarios and determine to guide the behavior of the terminal device (e.g., UE) for different configurations of the secondary cell, thereby achieving the trade-off between power saving and data transmission, and simultaneously saving DL signaling. In particular, embodiments of the present disclosure may send an indication from the gNB to the UE to instruct the UE behavior how to associate the secondary cell activation/deactivation/BWP handover with the BWP handover of the primary cell.
Specifically, in some embodiments (also referred to as option 1), an expiration event of the transmission bandwidth timer of the primary cell (hereinafter "primary cell timer") may stop the transmission bandwidth timer of the primary cell (hereinafter "secondary cell timer").
For option 1, when the primary cell timer expires or DCI triggers a handover to the default BWP of the primary cell, the gNB indicates that the UE has no transmission requirements on the secondary cell, then two types of behavior can be utilized to save more UE power:
type 1: if the slave cell is operating at its normal BWP and the slave cell timer and the default BWP for the slave cell are configured, the BWP handover event for the master cell will automatically stop the slave cell timer and will handover the slave cell to the corresponding default BWP (typically a narrower bandwidth). In this way, the UE can be guaranteed to operate with a narrower bandwidth from the cell, which can save power.
Type 2: a slave cell may be deactivated if it is already operating at its default BWP and does not need to use such default BWP for transmission. That is, in this case, if the master cell is switched to the default BWP of the master cell, the deactivation timer of the slave cell will be directly stopped.
In other embodiments (also referred to as option 2), the master cell timer expiration event may stop the slave cell deactivation timer.
With option 2, the event that the master cell switches to its default BWP directly stops the deactivation timer of the slave cell regardless of whether the slave cell is operating in normal broadband BWP or narrowband BWP, so that the slave cell in the activated state is deactivated, thereby saving power consumption.
These embodiments described above (option 1 and option 2) are valid for scenario 1 (no transmission or only a small data transmission). In this case, the default BWP pre-configured for the primary cell (i.e., the default BWP of the primary cell) can satisfy the data transmission requirement without other secondary cells.
In still other embodiments (also referred to as option 3), the BWP of the master cell is switched from the default BWP to its normal BWP, and the slave cell may be activated and/or triggered to switch to the normal BWP of the slave cell.
The embodiment corresponding to option 3 is applicable to the scenario where the primary cell switches back to its normal BWP by scheduling DCI, for example, where there is a large amount of data to transmit and/or where traffic needs to be transferred to the secondary cell. For these cases, since a large amount of data is waiting for transmission, the requirement for data transmission needs to be satisfied from the cell. However, if none of the slave cells is in a normal active state, additional DL signaling may be directly sent to activate at least one slave cell. Embodiments of the present disclosure effectively avoid such additional DL signaling. In particular, embodiments of the present disclosure automatically activate at least one slave cell, e.g., by scheduling DCI, such that the event that the primary cell switches to a normal BWP that the primary cell pre-configures. According to the embodiment corresponding to option 3, when the gNB switches the primary cell to the normal BWP preconfigured for the primary cell (i.e. the normal BWP of the primary cell), it can be ensured that at least one of the secondary cells is operating normally, and takes over the data transmission task.
Fig. 6 illustrates a block diagram of a device 600 suitable for implementing embodiments of the present disclosure. Device 600 may be used to implement network devices or terminal devices, such as network device 110 and terminal device 120 shown in fig. 1.
As shown, the device 600 includes a controller 610. The controller 610 controls the operation and functions of the device 600. For example, in some embodiments, controller 610 may perform various operations by way of instructions 630 stored in memory 620 coupled thereto. The memory 620 may be of any suitable type suitable to the local technical environment and may be implemented using any suitable data storage technology, including but not limited to semiconductor-based memory devices, magnetic memory devices and systems, optical memory devices and systems. Although only one memory unit is shown in FIG. 6, there may be multiple physically distinct memory units within device 600.
The controller 610 may be of any suitable type suitable to the local technical environment and may include, but is not limited to, one or more of general purpose computers, special purpose computers, microcontrollers, digital signal controllers (DSPs), and controller-based multi-core controller architectures. The device 600 may also include a plurality of controllers 610. The controller 610 is coupled to a transceiver 640, which transceiver 640 may enable the reception and transmission of information by way of one or more antennas 650 and/or other components.
When the device 600 is acting as the network device 110, the controller 610 and the transceiver 640 may operate in cooperation to implement the method 200 described above with reference to fig. 2. Wherein the controller 610 is configured to determine a configuration for an operational state of a slave cell of the network device in response to a handover of a transmission bandwidth of a master cell of the network device, the transmission bandwidth of the master cell being a bandwidth used by the master cell for communicating with the terminal device. The transceiver 640 is configured to send the configuration to the terminal device such that the terminal device determines the operational state of the slave cell based on the configuration.
In some embodiments, the controller 610 may be further configured to: determining transmission bandwidth associated information with a slave cell in response to determining that a transmission bandwidth of a master cell is switched to a default transmission bandwidth preconfigured for the master cell; switching the transmission bandwidth of the slave cell to a default transmission bandwidth preconfigured for the slave cell in response to the transmission bandwidth of the slave cell being for a normal transmission bandwidth preconfigured for the slave cell; and setting the slave cell to a deactivated state in response to the default transmission bandwidth of the slave cell not being configured, the transmission bandwidth timer of the slave cell also not being configured, and the deactivation timer of the slave cell not expiring.
In some embodiments, the controller 610 may be further configured to: the secondary cell is set to a deactivated state in response to determining that the transmission bandwidth of the primary cell is switched to a default transmission bandwidth preconfigured for the primary cell.
In some embodiments, the controller 610 may be further configured to: the deactivation timer for the slave cell is stopped.
In some embodiments, the controller 610 may be further configured to: determining whether the slave cell is in a deactivated state in response to determining that the transmission bandwidth of the master cell is switched to a normal transmission bandwidth preconfigured for the master cell; activating the slave cell in response to determining that the slave cell is in the deactivated state; determining whether a transmission bandwidth of the slave cell is a default transmission bandwidth preconfigured for the slave cell in response to determining that the slave cell is in an active state; and switching the transmission bandwidth from the secondary cell to a normal transmission bandwidth preconfigured for the secondary cell in response to determining that the transmission bandwidth from the secondary cell is a default transmission bandwidth preconfigured for the secondary cell.
In some embodiments, the transceiver 640 may be further configured to: and sending the radio resource control signaling or the downlink control signaling comprising the configuration to the terminal equipment.
In some embodiments, the controller 610 may be further configured to: determining, in response to expiration of a transmission bandwidth timer of a primary cell, that a transmission bandwidth of the primary cell is switched to a default transmission bandwidth preconfigured for the primary cell; and in response to the load of the primary cell exceeding a threshold load, determining that the transmission bandwidth of the primary cell switches to a normal transmission bandwidth preconfigured for the primary cell.
When the device 600 is acting as a terminal device 120, the controller 610 and the transceiver 640 may operate in cooperation to implement the method 500 described above with reference to fig. 5. Wherein the transceiver 640 is configured to receive from the network device a configuration for an operational state of a secondary cell of the network device, the configuration being determined by the network device in response to a handover of a transmission bandwidth of a primary cell of the network device, the transmission bandwidth of the primary cell being a bandwidth used by the primary cell for communicating with the terminal device; and the controller 610 is configured to determine an operation state of the slave cell based on the configuration.
In some embodiments, the transceiver 640 may be further configured to: the configuration is received from radio resource control signaling or downlink control signaling.
In some embodiments, the controller 610 may be further configured to perform at least one of: determining that the slave cell is set to an active state; determining that the slave cell is set to a deactivated state; determining that the slave cell is in an active state and that a transmission bandwidth of the slave cell is switched to a default transmission bandwidth preconfigured for the slave cell; and determining that the slave cell is in an active state and that a transmission bandwidth of the slave cell is switched to a normal transmission bandwidth preconfigured for the slave cell.
All of the features described above with reference to fig. 2-5 apply to the apparatus 600 and are not described in detail herein.
In general, the various example embodiments of this disclosure may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. Certain aspects may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device. While aspects of embodiments of the disclosure have been illustrated or described as block diagrams, flow charts, or using some other pictorial representation, it is well understood that the blocks, apparatus, systems, techniques or methods described herein may be implemented in, as non-limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.
By way of example, embodiments of the disclosure may be described in the context of machine-executable instructions, such as those included in program modules, being executed in a device on a target real or virtual processor. Generally, program modules include routines, programs, libraries, objects, classes, components, data structures, etc. that perform particular tasks or implement particular abstract data types. In various embodiments, the functionality of the program modules may be combined or divided between program modules as described. Machine-executable instructions for program modules may be executed within local or distributed devices. In a distributed facility, program modules may be located in both local and remote memory storage media.
Computer program code for implementing the methods of the present disclosure may be written in one or more programming languages. These computer program codes may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the program codes, when executed by the computer or other programmable data processing apparatus, cause the functions/acts specified in the flowchart and/or block diagram block or blocks to be performed. The program code may execute entirely on the computer, partly on the computer, as a stand-alone software package, partly on the computer and partly on a remote computer or entirely on the remote computer or server.
In the context of this disclosure, a machine-readable medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. The machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination thereof. More detailed examples of a machine-readable storage medium include an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical storage device, a magnetic storage device, or any suitable combination thereof.
Additionally, while operations are depicted in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all illustrated operations be performed, to achieve desirable results. In some cases, multitasking or parallel processing may be beneficial. Likewise, while the above discussion contains certain specific implementation details, this should not be construed as limiting the scope of any invention or claims, but rather as describing particular embodiments that may be directed to particular inventions. Certain features that are described in this specification in the context of separate embodiments can also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment can also be implemented in multiple embodiments separately or in any suitable subcombination.
Although the subject matter has been described in language specific to structural features and/or methodological acts, it is to be understood that the subject matter defined in the appended claims is not limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.

Claims (22)

  1. A method implemented at a network device, comprising:
    determining a configuration of an operational state for a slave cell of the network device in response to a handover of a transmission bandwidth of a master cell of the network device, the transmission bandwidth of the master cell being a bandwidth used by the master cell for communicating with a terminal device; and
    transmitting the configuration to the terminal device to cause the terminal device to determine an operational state of the slave cell based on the configuration.
  2. The method of claim 1, wherein determining a configuration of an operational state of a slave cell for the network device comprises:
    determining transmission bandwidth associated information with the slave cell in response to determining that the transmission bandwidth of the master cell is switched to a default transmission bandwidth preconfigured for the master cell;
    switching the transmission bandwidth of the slave cell to a default transmission bandwidth preconfigured for the slave cell in response to the transmission bandwidth of the slave cell being the normal transmission bandwidth preconfigured for the slave cell; and
    setting the slave cell to a deactivated state in response to the default transmission bandwidth of the slave cell not being configured, the transmission bandwidth timer of the slave cell also not being configured, and the deactivation timer of the slave cell not expiring.
  3. The method of claim 1, wherein determining a configuration of an operational state of a slave cell for the network device comprises:
    setting the slave cell to a deactivated state in response to determining that the transmission bandwidth of the master cell is switched to a default transmission bandwidth preconfigured for the master cell.
  4. The method of claim 3, wherein setting the slave cell to a deactivated state comprises:
    stopping a deactivation timer for the slave cell.
  5. The method of claim 1, wherein determining a configuration of an operational state of a slave cell for the network device comprises:
    determining whether the slave cell is in a deactivated state in response to determining that the transmission bandwidth of the master cell is switched to a normal transmission bandwidth preconfigured for the master cell;
    activating the slave cell in response to determining that the slave cell is in a deactivated state;
    in response to determining that the slave cell is in an active state, determining whether a transmission bandwidth of the slave cell is a default transmission bandwidth preconfigured for the slave cell; and
    switching the transmission bandwidth of the slave cell to a normal transmission bandwidth preconfigured for the slave cell in response to determining that the transmission bandwidth of the slave cell is a default transmission bandwidth preconfigured for the slave cell.
  6. The method of claim 1, wherein sending the configuration to the terminal device comprises:
    transmitting radio resource control signaling or downlink control signaling including the configuration to the terminal device.
  7. The method of claim 1, further comprising at least one of:
    determining, in response to expiration of a transmission bandwidth timer of the primary cell, that a transmission bandwidth of the primary cell is switched to a default transmission bandwidth preconfigured for the primary cell; and
    in response to the load of the primary cell exceeding a threshold load, determining that the transmission bandwidth of the primary cell switches to a normal transmission bandwidth preconfigured for the primary cell.
  8. A method implemented at a terminal device, comprising:
    receiving, from a network device, a configuration of an operational state of a secondary cell of the network device, the configuration determined by the network device in response to a handover of a transmission bandwidth of a primary cell of the network device, the transmission bandwidth of the primary cell being a bandwidth used by the primary cell to communicate with the terminal device; and
    determining an operating state of the slave cell based on the configuration.
  9. The method of claim 8, wherein receiving, from a network device, a configuration of an operational state of a secondary cell for the network device comprises:
    the configuration is received from radio resource control signaling or downlink control signaling.
  10. The method of claim 8, wherein determining an operational state of the slave cell based on the configuration comprises at least one of:
    determining that the slave cell is set to an active state;
    determining that the slave cell is set to a deactivated state;
    determining that the slave cell is in an active state and that a transmission bandwidth of the slave cell is switched to a default transmission bandwidth preconfigured for the slave cell; and
    determining that the slave cell is in an active state and that a transmission bandwidth of the slave cell is switched to a normal transmission bandwidth preconfigured for the slave cell.
  11. A network device for communication, comprising:
    a controller configured to determine a configuration of an operating state for a slave cell of the network device in response to a handover of a transmission bandwidth of a master cell of the network device, the transmission bandwidth of the master cell being a bandwidth used by the master cell to communicate with a terminal device; and
    a transceiver configured to transmit the configuration to the terminal device to cause the terminal device to determine an operational state of the slave cell based on the configuration.
  12. The network device of claim 11, wherein the controller is further configured to:
    determining transmission bandwidth associated information with the slave cell in response to determining that the transmission bandwidth of the master cell is switched to a default transmission bandwidth preconfigured for the master cell;
    switching the transmission bandwidth of the slave cell to a default transmission bandwidth preconfigured for the slave cell in response to the transmission bandwidth of the slave cell being the normal transmission bandwidth preconfigured for the slave cell; and
    setting the slave cell to a deactivated state in response to the default transmission bandwidth of the slave cell not being configured, the transmission bandwidth timer of the slave cell also not being configured, and the deactivation timer of the slave cell not expiring.
  13. The network device of claim 11, wherein the controller is further configured to:
    setting the slave cell to a deactivated state in response to determining that the transmission bandwidth of the master cell is switched to a default transmission bandwidth preconfigured for the master cell.
  14. The network device of claim 13, wherein the controller is further configured to:
    stopping a deactivation timer for the slave cell.
  15. The network device of claim 11, wherein the controller is further configured to:
    determining whether the slave cell is in a deactivated state in response to determining that the transmission bandwidth of the master cell is switched to a normal transmission bandwidth preconfigured for the master cell;
    activating the slave cell in response to determining that the slave cell is in a deactivated state;
    in response to determining that the slave cell is in an active state, determining whether a transmission bandwidth of the slave cell is a default transmission bandwidth preconfigured for the slave cell; and
    switching the transmission bandwidth of the slave cell to a normal transmission bandwidth preconfigured for the slave cell in response to determining that the transmission bandwidth of the slave cell is a default transmission bandwidth preconfigured for the slave cell.
  16. The network device of claim 11, wherein the transceiver is further configured to:
    transmitting radio resource control signaling or downlink control signaling including the configuration to the terminal device.
  17. The network device of claim 11, wherein the controller is further configured to perform at least one of:
    determining, in response to expiration of a transmission bandwidth timer of the primary cell, that a transmission bandwidth of the primary cell is switched to a default transmission bandwidth preconfigured for the primary cell; and
    in response to the load of the primary cell exceeding a threshold load, determining that the transmission bandwidth of the primary cell switches to a normal transmission bandwidth preconfigured for the primary cell.
  18. A terminal device for communication, comprising:
    a transceiver configured to receive from a network device a configuration of an operational state of a secondary cell of the network device, the configuration determined by the network device in response to a handover of a transmission bandwidth of a primary cell of the network device, the transmission bandwidth of the primary cell being a bandwidth used by the primary cell to communicate with the terminal device; and
    a controller configured to determine an operating state of the slave cell based on the configuration.
  19. The terminal device of claim 18, wherein the transceiver is further configured to:
    the configuration is received from radio resource control signaling or downlink control signaling.
  20. The terminal device of claim 18, wherein the controller is further configured to perform at least one of:
    determining that the slave cell is set to an active state;
    determining that the slave cell is set to a deactivated state;
    determining that the slave cell is in an active state and that a transmission bandwidth of the slave cell is switched to a default transmission bandwidth preconfigured for the slave cell; and
    determining that the slave cell is in an active state and that a transmission bandwidth of the slave cell is switched to a normal transmission bandwidth preconfigured for the slave cell.
  21. A network device, comprising:
    a processor and a memory, the memory including a program executable by the processor, the processor causing the network device to perform the method of any of claims 1-7 when the program is executed.
  22. A terminal device, comprising:
    a processor and a memory, the memory comprising a program executable by the processor, the processor causing the terminal device to perform the method according to any one of claims 8-10 when executing the program.
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