CN111373802B - Communication method and communication device - Google Patents
Communication method and communication device Download PDFInfo
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- CN111373802B CN111373802B CN201780096864.XA CN201780096864A CN111373802B CN 111373802 B CN111373802 B CN 111373802B CN 201780096864 A CN201780096864 A CN 201780096864A CN 111373802 B CN111373802 B CN 111373802B
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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
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- 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
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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 operation state of a slave cell for 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 communication with the terminal device; and transmitting the configuration to the terminal device so that the terminal device determines an operation state of the slave cell based on the configuration. A communication method implemented at a terminal device, and corresponding terminal device and network device are also provided.
Description
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
To meet the requirements of transmission rate and system capacity improvement, existing communication technologies introduce carrier aggregation (Carrier Aggregation, CA) to increase the system transmission bandwidth. The carrier aggregation technology can aggregate a plurality of member carriers (Component Carrier, CC) together to realize a larger (for example, 100 MHz) transmission bandwidth, thereby effectively improving the uplink and downlink transmission rate and the system capacity. In general, a master cell (PCell) is a cell operating on a master CC, and a slave cell (SCell) is a cell operating on a slave CC. If carrier aggregation is not configured, only one serving cell, namely a main cell; if carrier aggregation is configured, the serving cell includes a master cell and a slave cell.
According to the current communication technology, a Bandwidth Part (BWP) concept has been proposed for the transmission Bandwidth of the master cell or the slave cell. In general, BWP is different from the total bandwidth of one cell, but indicates a portion of the total bandwidth of the cell, which is a portion of bandwidth that the receiver actually detects on radio frequency.
In general, the default BWP configured for the master cell or the slave cell is small relative to the configured normal BWP. In contrast, this configuration is mandatory for the master cell and optional for the slave cell. In addition, switching of the default BWP and the normal BWP may be performed based on a timer, thereby contributing to saving power consumption. For example, when a downlink control channel (PDCCH) is decoded for data transmission, the timer starts/restarts; 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. As far as the expiration of the primary cell timer is concerned, there are mainly two potential scenarios: scene 1: no data transmission or only small data transmission, so that the broadband radio frequency receiving/transmitting is not required to be continued, so that the power consumption can be saved; scene 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 requirement, 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, the primary cell timer and the secondary cell timer operation are now completely independent. Even if the master cell timer expires for energy saving purposes, the slave cell may still be in operation and may be operating at a larger bandwidth, which does 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 that are capable of adjusting the configuration of a slave cell based on a transmission bandwidth handover of a master cell, thereby being capable of satisfying both data transmission requirements and achieving 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 operation state of a slave cell for 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 communication with the terminal device; and transmitting the configuration to the terminal device so that the terminal device determines an operation state of the slave cell based on the configuration.
In this regard, embodiments of the present disclosure also provide a network device for communicating, comprising: a controller configured to determine a configuration of an operation state of a slave cell for 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 communication with the terminal device; and a transceiver configured to transmit the configuration to the terminal device, such that the terminal device determines an operation 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 a 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 operational state of a secondary cell for 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 communication with the terminal device; and means for transmitting the configuration to the terminal device so that the terminal device determines the 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 for an operational state of a 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 operational state of the secondary 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 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 operational 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 a 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 for an operational state of a 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 means for determining an operational state of the secondary cell based on the configuration.
It should be understood that the description in this summary is not intended to limit key or critical features of the disclosed embodiments, nor is it intended to limit the scope of the 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 embodiments of the present disclosure will become more apparent by reference to the following detailed description when taken in conjunction with the accompanying drawings. In the drawings, wherein like or similar reference numerals denote like or similar elements, in which:
FIG. 1 illustrates an example communication network in which embodiments of the present disclosure may be implemented;
fig. 2 illustrates a flow chart of a method implemented at a network device side according to some embodiments of the present disclosure;
Fig. 3 illustrates a flow chart of a method implemented at a network device side according to some embodiments of the present disclosure;
fig. 4 illustrates a flow chart of a method implemented at a 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 a device 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 have been shown in the accompanying 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 are provided to provide a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are for illustration purposes only and are not intended to limit the scope of the present disclosure.
According to embodiments of the present disclosure, a "network device" refers to other entities or nodes having a particular function in a base station or communication network. A "base station" (BS) may refer to 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 repeater, or a low power node such as a pico base station, femto base station, etc. In the context of the present disclosure, for ease of discussion, the terms "network device" and "base station" may be used interchangeably and may be used primarily with 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 examples, 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), as well as the above devices on-board. In the context of the present disclosure, for ease of discussion, the terms "terminal device" and "UE" may be used interchangeably.
The term "transmission bandwidth" as used herein refers to the portion of bandwidth that the receiver actually detects on radio frequency, e.g., BWP. The term "primary cell timer" is also referred to herein as "transmission bandwidth timer of the primary cell" for controlling the handover between the normal BWP preconfigured for the primary cell and the default BWP. In an embodiment of the present disclosure, for the primary cell, a default BWP may be preconfigured, which may be a smaller bandwidth, and one or more normal BWP, which 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 less than or equal to the default BWP. Furthermore, for the slave cell, a default BWP and one or more normal BWP may be preconfigured, wherein the relationship between the default BWP and the normal BWP is similar to the above-mentioned manner.
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 the default BWP preconfigured for the primary cell.
The term "cell timer" is also referred to herein as "transmission bandwidth timer of a slave cell" for controlling a handover between a normal BWP and a default BWP pre-configured for the cell. Specifically, when the transmission bandwidth timer of the slave cell expires (or times out), the transmission bandwidth of the slave cell (e.g., the BWP currently used by the slave cell) is switched to the default BWP preconfigured for the slave cell.
The term "slave cell deactivation timer" is used herein to control the activation state and/or deactivation state of a slave cell. Specifically, when the deactivation timer of the slave cell expires or is stopped, the slave cell is switched to a deactivation (deactivation) state. It should be understood 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 active state.
The terms "including" or "comprising," and variations thereof, as used herein, are intended to be inclusive and open-ended, 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". Related definitions of other terms will be given in the description below.
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 energy saving purposes, the slave cell may still be in operation and may operate with a larger BWP, which may not meet the power consumption saving requirement.
To address these and other potential problems, embodiments of the present disclosure provide a communication method. According to the method of embodiments of the present disclosure, a network device determines a configuration for the operating state of its secondary cell in response to a handover of the transmission bandwidth of its primary cell, and sends the configuration to a terminal device. The terminal device then determines the operating state of the slave cell based on the received configuration. In this way, the network device can configure the behavior of the secondary cell in accordance with the handover of the transmission bandwidth of the primary cell, and notify the terminal device of such configuration. Thus, 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. The communication network 100 includes a network device 110 and a terminal device 120 in communication therewith. By way of example only, the network device 110 of fig. 1 has a master cell 101 and one slave cell 102. It should be understood that this is merely illustrative and that network device 110 may have multiple slave cells in embodiments according to the present disclosure. In the example of fig. 1, terminal device 120 communicates with master cell 101 on a master CC and optionally with slave cell 102 on a 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 protocols now known or later developed. Moreover, the communication may employ any suitable wireless communication technology 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 technology now known or later developed.
It should be understood that the number of network devices, the number of terminal devices, the number of master and slave 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 a suitable range and a 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 chart of a method 200 implemented at the terminal device side according to some embodiments of the present disclosure is shown. It is to be appreciated that the method 200 can be implemented, for example, at the 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 secondary cell 102 for the network device 110 in response to a handover of a transmission bandwidth of its primary cell 101. The transmission bandwidth of the primary cell 101 is the bandwidth used by the primary cell 101 to communicate with the terminal device 120.
In some embodiments, the switching of the transmission bandwidth of the primary cell 101 may be a switching of the transmission bandwidth of the primary cell to a default transmission bandwidth pre-configured for the primary cell, e.g. a 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. a handover of the primary cell 101 from its default BWP to its normal BWP.
According to embodiments of the present disclosure, the above-described handover of the transmission bandwidth of the primary cell 101 may be determined in a variety of 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 switches to a default transmission bandwidth pre-configured 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 large number of terminal devices are served, it may be determined that the transmission bandwidth of the primary cell 101 switches to a normal transmission bandwidth preconfigured for the primary cell 101.
According to embodiments of the present disclosure, a handover of the transmission bandwidth of the primary cell 101 may trigger various operating states of the secondary cell 102. Such as, but not limited to: an activated state; a deactivated state; an active state and the transmission bandwidth is switched to a default transmission bandwidth; an active state and the transmission bandwidth is switched to a normal transmission bandwidth preconfigured for the cell; etc.
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. For the slave cell 102, the transmission bandwidth timer and corresponding default BWP of the cell 102 are optional. The slave cell 102 may have two timers: a transmission bandwidth timer from cell 102 for controlling handover between normal broadband BWP and 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 a transmission bandwidth timer expiration event of the master cell 101 occurs, there may be three operational states: state 1: the slave cell 102 is in a normal operating state, and both its deactivation timer and transmission bandwidth timer are in an operating 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; state 3: the slave cell 102 is in an inactive state and no timer is running.
It should be understood that the above-described operating conditions are exemplary only and are not intended to be limiting. It is within the scope of the present disclosure that the secondary cell may have any other suitable operational state.
According to embodiments of the present disclosure, the configuration for the operational state of the slave cell 102 may be determined in a variety of ways. Fig. 3 illustrates a flow chart of a method 300 of determining a configuration of an operational state of a slave cell, according to some 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.
In block 310, in response to determining that the transmission bandwidth of the primary cell 101 switches to a default transmission bandwidth pre-configured for the primary cell 101, information associated with the transmission bandwidth of the secondary cell 102 is determined. At block 320, in response to the transmission bandwidth of the slave cell 102 being the normal transmission bandwidth preconfigured for the slave cell 102, the transmission bandwidth of the slave cell 102 is switched to the 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 expiring.
As another alternative, in other embodiments of the present disclosure, the network device 110 may also set the secondary cell 102 to a deactivated state in response to determining that the transmission bandwidth of the primary cell 102 switches to a default transmission bandwidth that is preconfigured for the primary cell 101. In these embodiments, the deactivation timer from 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, according to 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, in response to determining that the transmission bandwidth of the primary cell 101 switches to the normal transmission bandwidth preconfigured for the primary cell 101, it is determined whether the secondary cell 102 is in a deactivated state. At block 420, in response to determining that the slave cell 102 is in a deactivated state, the slave cell 102 is activated. Thus, the slave cell 102 may be in an active state. At block 430, in response to determining that the cell 102 is in an active state, it is determined whether the transmission bandwidth of the slave cell 102 is a default transmission bandwidth pre-configured for the slave cell 102. At block 440, in response to determining that the transmission bandwidth of the slave cell 102 is the default transmission bandwidth pre-configured for the slave cell 102, the transmission bandwidth of the slave cell 102 is switched to the normal transmission bandwidth pre-configured for the slave cell 102.
It should be understood that the embodiments discussed above for determining the configuration of the operating state of the slave cell 102 are exemplary only and are not intended to be limiting. Other suitable implementations within the scope of the present disclosure may be employed by those skilled in the art to determine such a configuration.
With continued reference to fig. 2, at block 220, the network device 110 transmits the determined configuration to the terminal device 120, such that the terminal device 120 determines the operational status of the slave cell 102 based on the configuration. The network device 110 may send the configuration determined at block 210 using higher layer signaling, such as Radio Resource Control (RRC) signaling, or using L1 layer signaling, such as downlink control (PDCCH). For example, the network device 110 may send radio resource control signaling or downlink control signaling including the configuration to the terminal device 120.
In some embodiments, network device 110 employs higher layer signaling. For example, when the network device 110 configures the slave cell 102 through an RRC procedure, when the transmission bandwidth timer of the master cell 101 expires, the network device 110 may send the configuration to the terminal device 120 included in RRC signaling to direct UE behavior on the 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 the transmission bandwidth of primary cell 101 may switch to its default BWP before its transmission bandwidth timer expires. For this case, the network device 110 may include an indication in the DCI to ensure that at least one secondary cell is operating properly.
Upon receiving the signaling from network device 110, terminal device 120 may extract a configuration of the operational state of slave cell 102 from the signaling and determine the operational state of slave cell 102 based on the configuration. By configuring the behavior of the slave cell 102 according to the handover 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 a terminal device side according to some embodiments of the present disclosure. It is to be appreciated that the method 500 can be implemented, for example, at the terminal device 120 as shown in fig. 1.
The method 500 begins at block 510, where the terminal device 120 receives a configuration for an operational state of the secondary cell 102 of the network device 110 from the 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 to communicate with the terminal device 120.
According to some embodiments of the present disclosure, the terminal device 120 may receive the above 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 of transmitting the configuration for the operational 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. Based on the received configuration, terminal device 120 may determine that the cell 102 is set to an active state, according to embodiments of the present disclosure; determining that the cell 102 is set to a deactivated state; determining that the cell 102 is in an active state and that the transmission bandwidth of the cell 102 is switched to a default transmission bandwidth pre-configured for the cell 102; determining that the cell 102 is in an active state and that the transmission bandwidth of the cell 102 is switched to a normal transmission bandwidth preconfigured for the cell 102; and/or other states from cell 102.
In this way, the terminal device 120 can be aware of the operational state of the slave cell 102 caused by the change in behavior of the master cell 101, so that data transmission with the master and slave cells can be achieved through a number of different options. The data transmission can meet the transmission requirement and improve the energy-saving efficiency, so that the system performance can be effectively improved.
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 handover of the transmission bandwidth (e.g., BWP) of the primary cell between the default BWP and the normal BWP has the following 3 potential application scenarios.
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 be transmitted, but in some cases (e.g., when the primary cell is overloaded) the network device (e.g., the gNB) wants to split these traffic loads to the secondary cells instead of using only the primary cell to transmit 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 is able to meet the data transmission requirements, then no data transmission from the secondary cell is required, otherwise power is wasted and the secondary cell cannot be optimally maintained at its normal BWP. That is, for scenario 1, more power may be saved by moving from the cell to the narrowband default BWP, or deactivating the slave cell.
With respect to scenario 2, while the primary cell is in good radio channel state, the gNB wants 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 situations to transmit buffered data. But if all the secondary cells are in an inactive state or in a default BWP state, it is necessary to ensure that at least one secondary cell is in a normal broadband state. This may result in additional Downlink (DL) signaling if DL signaling (L1/L2 layer signaling) is directly sent to activate the secondary cell when the primary cell timer expires. According to embodiments of the present disclosure, the master cell timer expiration event may be made to automatically start (restart) the slave cell timer, which advantageously avoids incurring additional signaling overhead.
In addition, with respect to scenario 3, 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 primary cell switching to the normal BWP may automatically activate the secondary cell.
According to embodiments of the present disclosure, a network device may identify and distinguish for the 3 scenarios described above and determine to direct the behavior of a terminal device (e.g., UE) for different configurations from a cell, thereby achieving a tradeoff between power saving and data transmission while enabling DL signaling saving. 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 a cell activation/deactivation/BWP handoff with a BWP handoff of the primary cell.
Specifically, in some embodiments (also referred to as option 1), the transmission bandwidth timer of the primary cell (hereinafter referred to as "primary cell timer") expiration event may stop the transmission bandwidth timer of the primary cell (hereinafter referred to as "secondary cell timer").
For option 1, when the primary cell timer expires or a DCI triggered handover to the default BWP of the primary cell occurs, the gNB indicates that the UE has no transmission requirements on the secondary cell, then the following two types of behavior may be utilized to save more UE power:
Type 1: if the secondary cell is operating in its normal BWP and is configured with a secondary cell timer and a secondary cell default BWP, the BWP switch event of the primary cell will automatically stop the secondary cell timer and switch the secondary 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, so that power can be saved.
Type 2: this secondary cell may be deactivated if it is already operating in its default BWP and does not need to use such default BWP for transmission. That is, in this case, if the primary cell is switched to the default BWP of the primary cell, the deactivation timer of the secondary 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.
For option 2, the event that the primary cell switches to its default BWP directly stops the secondary cell's deactivation timer, regardless of whether the cell is operating under normal broadband BWP or narrowband BWP, so that the secondary cell in the active 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 small data transmission). In this case, the default BWP preconfigured 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 primary cell switches from the default BWP to its normal BWP, the secondary cell may be activated and/or the normal BWP of the secondary cell triggered to switch from the secondary cell.
The embodiment corresponding to option 3 is applicable to scenarios where the primary cell switches back to its normal BWP by scheduling DCI, e.g. with a large amount of data to be transmitted and/or with traffic 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 no secondary cell is in a normal active state, additional DL signaling may be directly sent to activate at least one secondary cell. Embodiments of the present disclosure effectively avoid such additional DL signaling. Specifically, embodiments of the present disclosure automatically activate at least one secondary cell, for example, by scheduling DCI such that the event that the primary cell switches to the normal BWP preconfigured by the primary cell. 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 may be ensured that at least one secondary cell is working normally, taking 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 a network device or a terminal device, 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, the controller 610 may perform various operations by means of instructions 630 stored in a memory 620 coupled thereto. 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 in 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 a general purpose computer, a special purpose computer, a microcontroller, a digital signal controller (DSP), and a controller-based multi-core controller architecture. The device 600 may also include a plurality of controllers 610. Controller 610 is coupled to transceiver 640, which transceiver 640 may enable the reception and transmission of information by means of one or more antennas 650 and/or other components.
When device 600 is acting as network device 110, controller 610 and transceiver 640 may operate cooperatively to implement method 200 described above with reference to fig. 2. Wherein the controller 610 is configured to determine a configuration of an operation state of a secondary cell for 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 communication with the terminal device. The transceiver 640 is configured to transmit the configuration to the terminal device so that the terminal device determines the operating state of the secondary cell based on the configuration.
In some embodiments, the controller 610 may be further configured to: determining information associated with a transmission bandwidth of the secondary cell in response to determining that the transmission bandwidth of the primary cell switches to a default transmission bandwidth pre-configured for the primary 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 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: in response to determining that the transmission bandwidth of the primary cell switches to a default transmission bandwidth pre-configured for the primary cell, the secondary cell is set to a deactivated state.
In some embodiments, the controller 610 may be further configured to: the deactivation timer of the slave cell is stopped.
In some embodiments, the controller 610 may be further configured to: in response to determining that the transmission bandwidth of the primary cell switches to a normal transmission bandwidth preconfigured for the primary cell, determining whether the secondary cell is in a deactivated state; activating the secondary cell in response to determining that the secondary 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.
In some embodiments, 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 the primary cell, that the transmission bandwidth of the primary cell switches to a default transmission bandwidth pre-configured for the primary cell; and in response to the load of the primary cell exceeding the threshold load, determining that the transmission bandwidth of the primary cell switches to a normal transmission bandwidth preconfigured for the primary cell.
When device 600 is acting as terminal device 120, controller 610 and transceiver 640 may operate cooperatively to implement method 500 described above with reference to fig. 5. Wherein the transceiver 640 is configured to receive from the network device a configuration of an operational state of a 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 the controller 610 is configured to determine an operational state of the secondary cell based on the configuration.
In some embodiments, 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 the 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 the 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 are applicable to the apparatus 600 and are not described in detail herein.
In general, the various example embodiments of the disclosure may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. Some 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 the embodiments of the present disclosure are 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 present disclosure may be described in the context of machine-executable instructions, such as program modules, being included in devices on a real or virtual processor of a target. 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 split between described program modules. Machine-executable instructions for program modules may be executed within local or distributed devices. In a distributed device, program modules may be located in both local and remote memory storage media.
Computer program code for carrying out methods of the present disclosure may be written in one or more programming languages. These computer program code may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus such that the program code, when executed by the computer or other programmable data processing apparatus, causes the functions/operations specified in the flowchart and/or block diagram to be implemented. 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 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. The 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 with 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.
In addition, although 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, although the foregoing 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 of a secondary cell of 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
the configuration is sent to the terminal device such that the terminal device determines the operating state of the secondary 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 information associated with a transmission bandwidth of the secondary cell in response to determining that the transmission bandwidth of the primary cell switches to a default transmission bandwidth preconfigured for the primary cell;
switching the transmission bandwidth of the secondary cell to a default transmission bandwidth preconfigured for the secondary cell in response to the transmission bandwidth of the secondary cell being a normal transmission bandwidth preconfigured for the secondary cell; and
the secondary cell is set to a deactivated state in response to the default transmission bandwidth of the secondary cell not being configured, the transmission bandwidth timer of the secondary cell also not being configured, and the deactivation timer of the secondary 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:
in response to determining that the transmission bandwidth of the primary cell switches to a default transmission bandwidth preconfigured for the primary cell, the secondary cell is set to a deactivated state.
4. A method according to claim 3, wherein setting the slave cell to a deactivated state comprises:
and stopping the deactivation timer of 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 cell is in a deactivated state in response to determining that the transmission bandwidth of the primary cell switches to a normal transmission bandwidth preconfigured for the primary cell;
activating the slave cell in response to determining that the slave cell is in a deactivated state;
in response to determining that the secondary cell is in an active state, determining whether a transmission bandwidth of the secondary cell is a default transmission bandwidth preconfigured for the secondary cell; and
and switching the transmission bandwidth of the slave cell to the normal transmission bandwidth preconfigured for the slave cell in response to determining that the transmission bandwidth of the slave cell is the default transmission bandwidth preconfigured for the slave cell.
6. The method of claim 1, wherein transmitting the configuration to the terminal device comprises:
and sending the radio resource control signaling or the downlink control signaling comprising the configuration to the terminal equipment.
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 switches to a default transmission bandwidth pre-configured for the primary cell; and
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 for an operational state of a 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
an operational state of the secondary cell is determined based on the configuration.
9. The method of claim 8, wherein receiving, from the network device, a configuration of an operational state for a cell of 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 secondary cell is in an active state and that the transmission bandwidth of the secondary cell is switched to a default transmission bandwidth preconfigured for the secondary cell; and
determining that the secondary cell is in an active state and that the transmission bandwidth of the secondary cell is switched to a normal transmission bandwidth preconfigured for the secondary cell.
11. A network device for communication, comprising:
a controller configured to determine a configuration of an operation state of a slave cell for 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, such that the terminal device determines an operation state of the secondary cell based on the configuration.
12. The network device of claim 11, wherein the controller is further configured to:
determining information associated with a transmission bandwidth of the secondary cell in response to determining that the transmission bandwidth of the primary cell switches to a default transmission bandwidth preconfigured for the primary cell;
switching the transmission bandwidth of the secondary cell to a default transmission bandwidth preconfigured for the secondary cell in response to the transmission bandwidth of the secondary cell being a normal transmission bandwidth preconfigured for the secondary cell; and
the secondary cell is set to a deactivated state in response to the default transmission bandwidth of the secondary cell not being configured, the transmission bandwidth timer of the secondary cell also not being configured, and the deactivation timer of the secondary cell not expiring.
13. The network device of claim 11, wherein the controller is further configured to:
in response to determining that the transmission bandwidth of the primary cell switches to a default transmission bandwidth preconfigured for the primary cell, the secondary cell is set to a deactivated state.
14. The network device of claim 13, wherein the controller is further configured to:
and stopping the deactivation timer of the slave cell.
15. The network device of claim 11, wherein the controller is further configured to:
determining whether the cell is in a deactivated state in response to determining that the transmission bandwidth of the primary cell switches to a normal transmission bandwidth preconfigured for the primary cell;
activating the slave cell in response to determining that the slave cell is in a deactivated state;
in response to determining that the secondary cell is in an active state, determining whether a transmission bandwidth of the secondary cell is a default transmission bandwidth preconfigured for the secondary cell; and
and switching the transmission bandwidth of the slave cell to the normal transmission bandwidth preconfigured for the slave cell in response to determining that the transmission bandwidth of the slave cell is the default transmission bandwidth preconfigured for the slave cell.
16. The network device of claim 11, wherein the transceiver is further configured to:
and sending the radio resource control signaling or the downlink control signaling comprising the configuration to the terminal equipment.
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 switches to a default transmission bandwidth pre-configured for the primary cell; and
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 for an operational state of a 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 operational 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 secondary cell is in an active state and that the transmission bandwidth of the secondary cell is switched to a default transmission bandwidth preconfigured for the secondary cell; and
Determining that the secondary cell is in an active state and that the transmission bandwidth of the secondary cell is switched to a normal transmission bandwidth preconfigured for the secondary cell.
21. A network device, comprising:
a processor and a memory, the memory comprising a program executable by the processor, when executing the program, causing the network device to perform the method according to any one of claims 1-7.
22. A terminal device, comprising:
a processor and a memory, the memory comprising a program executable by the processor, when executing the program, causing the terminal device to perform the method according to any one of claims 8-10.
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| CN106454961A (en) * | 2015-08-07 | 2017-02-22 | 中国电信股份有限公司 | Cell switching method, system and device for flexible bandwidth |
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| CN101577920B (en) * | 2008-05-06 | 2012-05-09 | 中兴通讯股份有限公司 | Cell switching method and device |
| CN102076021B (en) * | 2010-12-22 | 2013-05-15 | 大唐移动通信设备有限公司 | Transmission resource allocation method and equipment |
| CN102388650B (en) * | 2011-09-29 | 2015-12-16 | 华为技术有限公司 | The method of handover between cells, base station and system |
| WO2014021761A2 (en) * | 2012-08-02 | 2014-02-06 | Telefonaktiebolaget L M Ericsson (Publ) | A node and method for handing over a sub-set of bearers to enable multiple connectivity of a terminal towards several base stations |
| JP2014183409A (en) * | 2013-03-18 | 2014-09-29 | Fujitsu Ltd | Communication system, communication method, mobile terminal, and control device |
| EP3681221B1 (en) * | 2014-10-10 | 2022-04-06 | Samsung Electronics Co., Ltd. | Method and device for configuring cell in wireless communication system |
| CN106470474B (en) * | 2015-08-17 | 2020-03-10 | 上海无线通信研究中心 | Method for using unlicensed frequency band by coexistence of different communication networks |
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| WO2013143051A1 (en) * | 2012-03-26 | 2013-10-03 | Renesas Mobile Corporation | Secondary cell activation and deactivation in carrier aggregation scenarios |
| CN106454961A (en) * | 2015-08-07 | 2017-02-22 | 中国电信股份有限公司 | Cell switching method, system and device for flexible bandwidth |
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