WO2022085170A1

WO2022085170A1 - Terminal and communication method

Info

Publication number: WO2022085170A1
Application number: PCT/JP2020/039801
Authority: WO
Inventors: 知也小原
Original assignee: 株式会社Ｎｔｔドコモ
Priority date: 2020-10-22
Filing date: 2020-10-22
Publication date: 2022-04-28
Also published as: JPWO2022085170A1

Abstract

This terminal comprises: a reception unit which receives an instruction for validating a secondary cell from a base station in a cell other than the secondary cell; and a control unit which assumes, on the basis of the characteristics applicable to the secondary cell, that a delay until the secondary cell is validated after the instruction has been received is shortened.

Description

Terminal and communication method

The present invention relates to a terminal and a communication method in a wireless communication system.

In NR (New Radio) (also referred to as "5G"), which is the successor system to LTE (Long Term Evolution), the requirements are a large capacity system, high-speed data transmission speed, low delay, and simultaneous use of many terminals. Techniques that satisfy connection, low cost, power saving, etc. are being studied (for example, Non-Patent Document 1).

In NR Release 17, MR-DC (Multi-RAT Dual-Connectivity) examines the mechanism of efficient activation and invalidation of secondary cell groups and secondary cells. For example, the mechanism in a secondary cell group applied to (NG) EN-DC ((NG-RAN) E-UTRA-NR Dual Connectivity) and NR-DC (NR-NR Dual Connectivity) is being investigated. In addition, the mechanism in a secondary cell applied to NR-CA (NR Carrier aggregation) is being investigated. The mechanism is applied to FR1 (Frequency range) and FR2. It is also being considered to support the modification and addition of primary and secondary cell group cells.

When the terminal is operating carrier aggregation, the secondary cell can be disabled to reduce power consumption. When activating a disabled secondary cell, a secondary cell activation delay (SCell activation delay) is required. Here, depending on the cycle of the synchronization signal, the secondary cell activation delay may become a large value, and the delay may become large.

The present invention has been made in view of the above points, and an object thereof is to reduce a delay when enabling a secondary cell in a wireless communication system.

According to the disclosed technique, the instruction to activate the secondary cell is received from the base station in a cell other than the secondary cell, and the instruction is received based on the characteristics applicable to the secondary cell. To provide a terminal having a control unit that is assumed to shorten the delay until the secondary cell is activated.

According to the disclosed technique, it is possible to reduce the delay when activating the secondary cell in the wireless communication system.

It is a figure which shows the structural example of the wireless communication system in embodiment of this invention. It is a figure which shows the example of the secondary cell activation. It is a flowchart for demonstrating the example (1) of the secondary cell activation in embodiment of this invention. It is a figure which shows the example (1) of the group of cells in embodiment of this invention. It is a figure which shows the example (2) of the group of cells in embodiment of this invention. It is a figure which shows the example (3) of the group of cells in embodiment of this invention. It is a figure which shows the example of the secondary cell activation in embodiment of this invention. It is a figure which shows the example (4) of the group of cells in embodiment of this invention. It is a figure which shows the example (5) of the group of cells in embodiment of this invention. It is a flowchart for demonstrating the example (2) of the secondary cell activation in embodiment of this invention. It is a flowchart for demonstrating the example (3) of the secondary cell activation in embodiment of this invention. It is a figure which shows an example of the functional structure of the base station 10 in embodiment of this invention. It is a figure which shows an example of the functional structure of the terminal 20 in embodiment of this invention. It is a figure which shows an example of the hardware composition of the base station 10 or the terminal 20 in embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The embodiments described below are examples, and the embodiments to which the present invention is applied are not limited to the following embodiments.

The existing technique is appropriately used in the operation of the wireless communication system according to the embodiment of the present invention. However, the existing technique is, for example, an existing LTE, but is not limited to the existing LTE. Further, the term "LTE" used in the present specification has a broad meaning including LTE-Advanced and LTE-Advanced and later methods (eg, NR) unless otherwise specified.

Further, in the embodiment of the present invention described below, SS (Synchronization signal), PSS (Primary SS), SSS (Secondary SS), PBCH (Physical broadcast channel), PRACH (Physical) used in the existing LTE. Random access channel), PDCCH (Physical Downlink Control Channel), PDSCH (Physical Downlink Shared Channel), PUCCH (Physical Uplink Control Channel), PUSCH (Physical Uplink Shared Channel), etc. are used. This is for convenience of description, and signals, functions, etc. similar to these may be referred to by other names. Further, the above-mentioned terms in NR correspond to NR-SS, NR-PSS, NR-SSS, NR-PBCH, NR-PRACH and the like. However, even if it is a signal used for NR, it is not always specified as "NR-".

Further, in the embodiment of the present invention, the duplex system may be a TDD (Time Division Duplex) system, an FDD (Frequency Division Duplex) system, or any other system (for example, Flexible Duplex, etc.). Method may be used.

Further, in the embodiment of the present invention, "configuring" the radio parameter or the like may mean that a predetermined value is set in advance (Pre-configure), or the base station 10 or The radio parameter notified from the terminal 20 may be set.

FIG. 1 is a diagram showing a configuration example of a wireless communication system according to an embodiment of the present invention. The wireless communication system according to the embodiment of the present invention includes a base station 10 and a terminal 20 as shown in FIG. Although FIG. 1 shows one base station 10 and one terminal 20, this is an example, and each of them may be plural.

The base station 10 is a communication device that provides one or more cells and performs wireless communication with the terminal 20. The physical resources of the radio signal are defined in the time domain and the frequency domain, the time domain may be defined by the number of OFDM (Orthogonal Frequency Division Multiplexing) symbols, and the frequency domain is defined by the number of subcarriers or the number of resource blocks. May be good. The base station 10 transmits a synchronization signal and system information to the terminal 20. Synchronous signals are, for example, NR-PSS and NR-SSS. The system information is transmitted by, for example, NR-PBCH, and is also referred to as broadcast information. As shown in FIG. 1, the base station 10 transmits a control signal or data to the terminal 20 by DL (Downlink), and receives the control signal or data from the terminal 20 by UL (Uplink). Both the base station 10 and the terminal 20 can perform beamforming to transmit and receive signals. Further, both the base station 10 and the terminal 20 can apply MIMO (Multiple Input Multiple Output) communication to DL or UL. Further, both the base station 10 and the terminal 20 may communicate via a secondary cell (SCell: Secondary Cell) and a primary cell (PCell: Primary Cell) by CA (Carrier Aggregation). Further, the terminal 20 may perform communication via a primary cell of the base station 10 by DC (Dual Connectivity) and a primary secondary cell group cell (PSCell: Primary Secondary cell group Cell) of another base station 10.

The terminal 20 is a communication device having a wireless communication function such as a smartphone, a mobile phone, a tablet, a wearable terminal, and a communication module for M2M (Machine-to-Machine). As shown in FIG. 1, the terminal 20 receives a control signal or data from the base station 10 by DL, and transmits the control signal or data to the base station 10 by UL, so that various types provided by the wireless communication system are provided. Use communication services.

Here, in NR Release 17, in MR-DC (Multi-RAT Dual-Connectivity), the mechanism of efficient activation and invalidation of the secondary cell group and the secondary cell is examined. For example, the mechanism in a secondary cell group applied to (NG) EN-DC ((NG-RAN) E-UTRA-NR Dual Connectivity) and NR-DC (NR-NR Dual Connectivity) is being investigated. In addition, the mechanism in a secondary cell applied to NR-CA (NR Carrier aggregation) is being investigated. The mechanism is applied to FR1 (Frequency range) and FR2. It is also being considered to support the modification and addition of primary and secondary cell group cells.

FIG. 2 is a diagram showing an example of enabling the secondary cell. When the terminal is in carrier aggregation operation, the secondary cell can be disabled to reduce power consumption. When activating a disabled secondary cell, a secondary cell activation delay (SCell activation delay) as shown in FIG. 2 is required.

As shown in FIG. 2, in order to enable the secondary cell, the base station 10 transmits a secondary cell activation command (SCellActivationCommand) and the terminal 20 transmits an ACK in a cell other than the secondary cell.

For example, under certain conditions, when a secondary cell activation command is received in slot n, the secondary cell activated by the time "slot n + T _HARQ + T _{activation_time} + T _{CSI_Reporting} " operates in the active state (for example, CSI report). Start.

_THARQ is the time from the downlink transmission including the MAC (Medium Access Control) -CE (Control Element) of the secondary cell activation command to the transmission of the ACK by the terminal 20.

T _{activation_time} corresponds to 3 ms corresponding to the terminal processing time (UE processing time) and radio warmup / retuning time (RF warmup / retuning time) of MAC-CE, and T corresponding to the time to the first SSB resource after the above 3 ms. It is composed of _firstSSB and 2ms corresponding to SSB processing time. It should be noted that the T _{activation_time} also includes the set time of AGC (Auto gain control) and the like.

T _{CSI_Reporting} is composed of the time from the above 2 ms to the CSI measurement resource, the terminal processing time for CSI measurement and reporting, and the time to the CSI reporting resource.

Here, in NR, the SSB periodicity may be a large value (for example, 20 ms, 160 ms, etc.), and among the secondary cell activation delays, the T _{first SSB} is a relatively large value, so that the delay is delayed. Becomes larger.

On the other hand, since there are cases where it is not always necessary to execute time and frequency tracking by SSB reception, there is room for shortening the secondary cell activation delay in such cases.

For example, when activating a secondary cell, if there are other already activated primary cells, primary secondary cell group cells, or secondary cells, the properties in common with the secondary cell you are trying to activate (eg very). If those already activated cells have (eg, located in a frequency band close to), they may be able to be reused for time and frequency synchronization.

For example, if a secondary cell has just transitioned from the enabled state to the disabled state, it may be possible to reuse the time and frequency synchronization in the previous enabled state.

For example, if the RRM (Radio Resource Management) measurement was immediately performed in a certain secondary cell, there is a possibility that the time and frequency synchronization when the RRM measurement is performed can be reused.

Therefore, when activating a secondary cell, if the specified cell exists in the already activated primary cell, primary secondary cell group cell, or secondary cell, a different secondary cell activation delay is specified or assumed. You may. That is, the secondary cell activation delay may be shortened by utilizing the information and properties of the cells that have already been activated.

The different secondary cell activation delays described above may be, for example, shorter delays. For example, it may be the time _{obtained by removing T firstSSB} _from T activation_time, or the time obtained by removing T _{first SSB} and 2 ms from T _{activation_time} . Further, it may be a value obtained by adding a short time (for example, about several hundred μs) for AGC processing, RF processing, or the like from the reduced value.

FIG. 3 is a flowchart for explaining an example (1) of enabling a secondary cell in the embodiment of the present invention. In step S11, the terminal 20 receives the secondary cell activation instruction. In the following step S12, the terminal 20 determines whether or not the cell specified in the already active cell exists. If the cell specified in the already active cell exists (YES in S12), the process proceeds to step S13, and if the cell specified in the already active cell does not exist (NO in S12), the process proceeds to step S14.

In step S13, the terminal 20 assumes a shortened secondary cell activation delay. On the other hand, in step S14, the terminal 20 assumes a conventional secondary cell activation delay. The conventional secondary cell activation delay may be an unreduced secondary cell activation delay.

The cell specified above may be determined based on a notification from the network or specifications. For example, when a group (or combination) of cells is notified and a cell in the group is activated as a secondary cell, if any cell in the group is activated, a different secondary cell activation delay will be applied. It may be specified or assumed.

FIG. 4 is a diagram showing an example (1) of a group of cells in the embodiment of the present invention. FIG. 4 is an example in which the primary cell and the secondary cell # 3 are designated as a combination capable of reducing the delay. When the activation of the secondary cell # 3 is performed, the primary cell is always activated. Therefore, by utilizing the information and properties of the primary cell that has already been activated, the terminal 20 enables the secondary cell. The delay may be reduced.

FIG. 5 is a diagram showing an example (2) of a group of cells in the embodiment of the present invention. FIG. 5 is an example in which the secondary cell # 2 and the secondary cell # 3 are designated as a combination capable of reducing the delay. When the activation of the secondary cell # 3 is performed, since the activated cell does not exist in the combination, the terminal 20 may assume the conventional secondary cell activation delay.

FIG. 6 is a diagram showing an example (3) of a group of cells in the embodiment of the present invention. FIG. 6 is an example in which the secondary cell # 1 and the secondary cell # 3 are designated as a combination capable of reducing the delay. Since the secondary cell # 1 is activated when the activation of the secondary cell # 3 is performed, the terminal 20 can use the information and properties of the already activated secondary cell # 1 to make the terminal 20 secondary. The cell activation delay may be shortened.

FIG. 7 is a diagram showing an example of secondary cell activation in the embodiment of the present invention. In cells other than the secondary cell to be activated, the secondary cell activation command is transmitted from the base station 10 to the terminal 20, and the ACK is transmitted from the terminal 20 to the base station 10. _THARQ is from the secondary cell activation command to the ACK transmission. After 3 ms, Xms and _{TCSI_Reporting have} elapsed after the ACK transmission, the CSI report is transmitted from the terminal 20 to the base station 10. As shown in FIG. 7, the secondary cell activation delay is T _HARQ + 3ms + Xms + T _{CSI_Reporting} . X may be, for example, the time required for the newly defined AGC, and X may be 0 ms. Further, if the MAC-CE processing time or the like is not required, 3 ms may be excluded from the secondary cell activation delay.

Furthermore, a gradual secondary cell activation delay may be specified or assumed. For example, the secondary cell activation delay is defined in three stages, and information indicating how close the information and properties are to the group may be notified, or information indicating which information and properties are in the same group may be notified. May be notified, or based on the notified information, it may be determined which secondary cell activation delay stage is expected.

For example, assume that

levels

1, 2, and 3 are defined as possible degrees of secondary cell activation delay (having close information and properties, or having many or important information and properties identical). The higher the level, the shorter the secondary cell activation delay. When level 1 is set, the secondary cell activation delay is the X slot, when level 2 is set, the secondary cell activation delay is the Y slot, and when level 3 is set, the secondary cell activation is The delay is the Z slot. At this time, X> Y> Z, for example, the X slot may have the same secondary cell activation delay as before. Further, for example, level 1 is a frequency band in which cells are separated from each other, level 2 is a frequency band in which cells are close to each other (for example, adjacent bands), and level 3 is an adjacent frequency band (for example, adjacent in the same band). Frequency band) may be used.

FIG. 8 is a diagram showing an example (4) of a group of cells in the embodiment of the present invention. As shown in FIG. 8, the primary cell and the secondary cell # 3 are designated as the combination level 3 capable of reducing the delay. Since the primary cell is always activated, the terminal 20 may assume that the secondary cell activation delay is the Z slot.

FIG. 9 is a diagram showing an example (5) of a group of cells in the embodiment of the present invention. As shown in FIG. 8, the primary cell and the secondary cell # 3 are designated as the combination level 1 capable of reducing the delay. Since the primary cell is always activated, the terminal 20 may assume that the secondary cell activation delay is an X slot.

Further, for example, if there is a cell having information and properties similar to that of the secondary cell to be activated among the activated cells, a different secondary cell activation delay may be specified or assumed.

For example, if the secondary cell to be activated is designated as a cell that is in the same band, is in a similar frequency band, or is co-located between cells, similar information and properties are used. May have. In addition, some of the conditions with close information and properties (eg, within the XHz range between cells) may be notified.

For example, it may be determined whether or not the terminal 20 has information and properties closer to the information obtained (RTT (Round trip time) with the cell, path loss, power strength, power quality, etc.). The criteria for such a decision may be notified or pre-defined.

For example, it may be determined whether or not the terminal 20 has similar information and properties depending on whether or not the hardware used by the terminal 20 is common (or whether or not it is assumed to be common). The criteria for such a decision may be notified or pre-defined. The criteria for this determination may be notified to the base station 10 as a terminal capability.

Furthermore, a gradual secondary cell activation delay may be specified or assumed. For example, a predetermined number of stages may be defined as the secondary cell activation delay, and information indicating how close the information and properties are to the group may be notified, and which information and properties are the same group. The information indicating the above may be notified, or it may be determined which secondary cell activation delay stage is to be assumed based on the notified information.

FIG. 10 is a flowchart for explaining an example (2) of enabling a secondary cell in the embodiment of the present invention. In step S21, the terminal 20 receives the secondary cell activation instruction. In the following step S22, the terminal 20 determines whether or not a cell having a property closer to the reference exists in the already active cell. If there is already a cell having a property close to the active cell (YES in S22), the process proceeds to step S23, and if there is no cell having a property close to the already active cell (NO in S22), the process proceeds to step S24.

In step S23, the terminal 20 assumes a shortened secondary cell activation delay. On the other hand, in step S24, the terminal 20 assumes a conventional secondary cell activation delay. The conventional secondary cell activation delay may be an unreduced secondary cell activation delay.

For example, at the time of secondary cell activation, a different secondary cell activation delay may be specified or assumed based on the passage of time from the previous operation regarding the secondary cell. That is, the secondary cell activation delay may be shortened by using the information previously acquired from the secondary cell.

The time lapse from the previous operation regarding the secondary cell may be, for example, the time lapse from the time when the secondary cell transitions from the enabled state to the disabled state, or the RRM for the secondary cell. It may be the lapse of time since the measurement or the transmission of the measurement report is performed. Further, the time lapse from the previous operation regarding the secondary cell may be the time lapse from the time when the terminal operation using another SSB or the reference signal is executed.

A standard (for example, a threshold value) related to the passage of time from the previous operation regarding the secondary cell is notified or specified in advance, and the terminal 20 assumes a conventional secondary cell activation delay when the time has elapsed from the standard. However, a shorter secondary cell activation delay may be assumed if the time has not elapsed from the standard. That is, if the passage of time is small, it may be assumed that the previous information is available.

Furthermore, a gradual secondary cell activation delay may be specified or assumed. For example, a predetermined number of stages are defined as the secondary cell activation delay, and a stage of the secondary cell activation delay is assumed based on the degree of passage of time (for example, after how many ms, after how many slots, etc.). You may decide whether to do it.

FIG. 11 is a flowchart for explaining an example (3) of enabling a secondary cell in the embodiment of the present invention. In step S31, the terminal 20 receives the secondary cell activation instruction. In the following step S32, the terminal 20 determines whether or not the elapsed time from the reference time point in the secondary cell is less than the threshold value. If there is already a cell having a property close to the active cell (YES in S32), the process proceeds to step S33, and if there is no cell having a property close to the already active cell (NO in S32), the process proceeds to step S34.

In step S33, the terminal 20 assumes a shortened secondary cell activation delay. On the other hand, in step S34, the terminal 20 assumes a conventional secondary cell activation delay. The conventional secondary cell activation delay may be an unreduced secondary cell activation delay.

When the secondary cell is activated, if the specified cell exists in the already activated primary cell, primary secondary group cell, or secondary cell, the time has elapsed since the previous operation regarding the secondary cell. Based on this, different secondary cell activation delays may be specified or assumed.

In the above embodiment, the operation related to shortening the delay when the secondary cell transitions from the disabled state to the enabled state has been described, but the secondary cell is in the disabled state to the dormant state (pause BWP is valid). The delay may be shortened by similarly applying it to the delay when transitioning to the activated state, or it may be similarly applied to the delay when the secondary cell transitions from the hibernate state to the activated state. May be shortened.

According to the above embodiment, when the terminal 20 activates the secondary cell, the delay until the secondary cell is activated can be reduced based on the cells having similar characteristics.

That is, in the wireless communication system, the delay when activating the secondary cell can be reduced.

(Device configuration)
Next, a functional configuration example of the base station 10 and the terminal 20 that execute the processes and operations described so far will be described. The base station 10 and the terminal 20 include a function for carrying out the above-described embodiment. However, the base station 10 and the terminal 20 may each have only a part of the functions in the embodiment.

<Base station 10>
FIG. 12 is a diagram showing an example of the functional configuration of the base station 10 according to the embodiment of the present invention. As shown in FIG. 12, the base station 10 has a transmission unit 110, a reception unit 120, a setting unit 130, and a control unit 140. The functional configuration shown in FIG. 12 is only an example. Any function classification and name of the functional unit may be used as long as the operation according to the embodiment of the present invention can be performed.

The transmission unit 110 includes a function of generating a signal to be transmitted to the terminal 20 side and transmitting the signal wirelessly. Further, the transmission unit 110 transmits a message between network nodes to another network node. The receiving unit 120 includes a function of receiving various signals transmitted from the terminal 20 and acquiring information of, for example, a higher layer from the received signals. Further, the transmission unit 110 has a function of transmitting NR-PSS, NR-SSS, NR-PBCH, DL / UL control signals and the like to the terminal 20. Further, the receiving unit 120 receives a message between network nodes from another network node.

The setting unit 130 stores preset setting information and various setting information to be transmitted to the terminal 20. The content of the setting information is, for example, a setting related to activation of the secondary cell of the terminal 20 and the like.

The control unit 140 controls the activation of the secondary cell as described in the embodiment. The function unit related to signal transmission in the control unit 140 may be included in the transmission unit 110, and the function unit related to signal reception in the control unit 140 may be included in the reception unit 120.

<Terminal 20>
FIG. 13 is a diagram showing an example of the functional configuration of the terminal 20 according to the embodiment of the present invention. As shown in FIG. 13, the terminal 20 has a transmission unit 210, a reception unit 220, a setting unit 230, and a control unit 240. The functional configuration shown in FIG. 13 is only an example. Any function classification and name of the functional unit may be used as long as the operation according to the embodiment of the present invention can be performed.

The transmission unit 210 creates a transmission signal from the transmission data and wirelessly transmits the transmission signal. The receiving unit 220 wirelessly receives various signals and acquires a signal of a higher layer from the received signal of the physical layer. Further, the receiving unit 220 has a function of receiving NR-PSS, NR-SSS, NR-PBCH, DL / UL / SL control signals and the like transmitted from the base station 10. Further, for example, the transmission unit 210 may use PSCCH (Physical Sidelink Control Channel), PSSCH (Physical Sidelink Shared Channel), PSDCH (Physical Sidelink Discovery Channel), PSBCH (Physical Sidelink Broadcast Channel) as D2D communication on another terminal 20. Etc. are transmitted, and the receiving unit 220 receives PSCCH, PSSCH, PSDCH, PSBCH, etc. from the other terminal 20.

The setting unit 230 stores various setting information received from the base station 10 by the receiving unit 220. The setting unit 230 also stores preset setting information. The content of the setting information is, for example, a setting related to activation of the secondary cell of the terminal 20 and the like.

The control unit 240 controls the activation of the secondary cell as described in the embodiment. The function unit related to signal transmission in the control unit 240 may be included in the transmission unit 210, and the function unit related to signal reception in the control unit 240 may be included in the reception unit 220.

(Hardware configuration)
The block diagram (FIGS. 12 and 13) used in the description of the above embodiment shows a block of functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Further, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized using one physically or logically coupled device, or two or more physically or logically separated devices can be directly or indirectly (eg, for example). , Wired, wireless, etc.) and may be realized using these plurality of devices. The functional block may be realized by combining the software with the one device or the plurality of devices.

Functions include judgment, decision, judgment, calculation, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, selection, establishment, comparison, assumption, expectation, and assumption. Broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc., but limited to these I can't. For example, a functional block (configuration unit) that makes transmission function is called a transmitting unit (transmitting unit) or a transmitter (transmitter). In each case, as described above, the realization method is not particularly limited.

For example, the base station 10, the terminal 20, and the like in one embodiment of the present disclosure may function as a computer that processes the wireless communication method of the present disclosure. FIG. 14 is a diagram showing an example of the hardware configuration of the base station 10 and the terminal 20 according to the embodiment of the present disclosure. The above-mentioned base station 10 and terminal 20 are physically configured as a computer device including a processor 1001, a storage device 1002, an auxiliary storage device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like. May be good.

In the following explanation, the word "device" can be read as a circuit, device, unit, etc. The hardware configuration of the base station 10 and the terminal 20 may be configured to include one or more of the devices shown in the figure, or may be configured not to include some of the devices.

For each function in the base station 10 and the terminal 20, by loading predetermined software (program) on the hardware such as the processor 1001 and the storage device 1002, the processor 1001 performs an calculation and controls the communication by the communication device 1004. It is realized by controlling at least one of reading and writing of data in the storage device 1002 and the auxiliary storage device 1003.

The processor 1001 operates, for example, an operating system to control the entire computer. The processor 1001 may be configured by a central processing unit (CPU: Central Processing Unit) including an interface with a peripheral device, a control device, an arithmetic unit, a register, and the like. For example, the above-mentioned control unit 140, control unit 240, and the like may be realized by the processor 1001.

Further, the processor 1001 reads a program (program code), a software module, data, or the like from at least one of the auxiliary storage device 1003 and the communication device 1004 into the storage device 1002, and executes various processes according to these. As the program, a program that causes a computer to execute at least a part of the operations described in the above-described embodiment is used. For example, the control unit 140 of the base station 10 shown in FIG. 12 may be realized by a control program stored in the storage device 1002 and operated by the processor 1001. Further, for example, the control unit 240 of the terminal 20 shown in FIG. 13 may be realized by a control program stored in the storage device 1002 and operated by the processor 1001. Although it has been described that the various processes described above are executed by one processor 1001, they may be executed simultaneously or sequentially by two or more processors 1001. Processor 1001 may be mounted by one or more chips. The program may be transmitted from the network via a telecommunication line.

The storage device 1002 is a computer-readable recording medium, and is, for example, by at least one of ROM (ReadOnlyMemory), EPROM (ErasableProgrammableROM), EEPROM (ElectricallyErasableProgrammableROM), RAM (RandomAccessMemory), and the like. It may be configured. The storage device 1002 may be referred to as a register, a cache, a main memory (main storage device), or the like. The storage device 1002 can store a program (program code), a software module, or the like that can be executed to implement the communication method according to the embodiment of the present disclosure.

The auxiliary storage device 1003 is a computer-readable recording medium, and is, for example, an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, an optical magnetic disk (for example, a compact disk, a digital versatile disk, Blu). -It may be composed of at least one of a ray (registered trademark) disk), a smart card, a flash memory (for example, a card, a stick, a key drive), a floppy (registered trademark) disk, a magnetic strip, and the like. The storage medium described above may be, for example, a database, server or other suitable medium containing at least one of the storage device 1002 and the auxiliary storage device 1003.

The communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, or the like. The communication device 1004 includes, for example, a high frequency switch, a duplexer, a filter, a frequency synthesizer, and the like in order to realize at least one of frequency division duplex (FDD: Frequency Division Duplex) and time division duplex (TDD: Time Division Duplex). It may be composed of. For example, the transmission / reception antenna, the amplifier unit, the transmission / reception unit, the transmission line interface, and the like may be realized by the communication device 1004. The transmission / reception unit may be physically or logically separated from each other in the transmission unit and the reception unit.

The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts an input from the outside. The output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that outputs to the outside. The input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).

Further, each device such as the processor 1001 and the storage device 1002 is connected by the bus 1007 for communicating information. The bus 1007 may be configured by using a single bus, or may be configured by using a different bus for each device.

Further, the base station 10 and the terminal 20 are hardware such as a microprocessor, a digital signal processor (DSP: Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), and an FPGA (Field Programmable Gate Array). It may be configured to include, and a part or all of each functional block may be realized by the hardware. For example, processor 1001 may be implemented using at least one of these hardware.

(Summary of embodiments)
As described above, according to the embodiment of the present invention, the receiving unit that receives the instruction for activating the secondary cell from the base station in a cell other than the secondary cell, and the characteristics applicable to the secondary cell. Based on the above, a terminal having a control unit that assumes a reduction in the delay from receiving the instruction to activating the secondary cell is provided.

With the above configuration, when the secondary cell is activated, the terminal 20 can reduce the delay until the secondary cell is activated based on the cells having similar characteristics. That is, in the wireless communication system, it is possible to reduce the delay when activating the secondary cell.

When an activated cell exists in a group of cells having characteristics similar to those of the secondary cell specified in advance, the control unit receives the instruction based on the characteristics of the activated cell. Then, the delay from the activation to the activation of the secondary cell may be shortened. With this configuration, the terminal 20 can reduce the delay until the secondary cell is activated based on the cells having similar characteristics when the secondary cell is activated.

When a cell having characteristics similar to those of the secondary cell specified in advance is activated, the control unit receives the instruction and then activates the secondary cell based on the characteristics of the similar cell. You may assume that the delay until is shortened. With this configuration, the terminal 20 can reduce the delay until the secondary cell is activated based on the cells having similar characteristics when the secondary cell is activated.

Cells having similar characteristics are classified into several stages based on the degree of similarity, and the control unit may assume that the higher the degree of similarity, the greater the reduction in the delay. With this configuration, when activating a secondary cell, the terminal 20 can reduce the delay until the secondary cell is activated according to the degree of similarity based on the cells having similar characteristics.

When the elapsed time from the operation of the secondary cell is less than the threshold value, the control unit receives the instruction and then sets the secondary cell based on the characteristics measured before the operation of the reference. You may assume that the delay until activation is shortened. With this configuration, when the secondary cell is activated, the terminal 20 can reduce the delay until the secondary cell is activated according to the elapsed time based on the cells having similar characteristics.

Further, according to the embodiment of the present invention, the instruction for activating the secondary cell is received from the base station in a cell other than the secondary cell, based on the reception procedure and the characteristics applicable to the secondary cell. Provided is a communication method in which a terminal executes a control procedure assuming a reduction in the delay from receiving an instruction to activating the secondary cell.

(Supplement to the embodiment)
Although the embodiments of the present invention have been described above, the disclosed inventions are not limited to such embodiments, and those skilled in the art will understand various modifications, modifications, alternatives, substitutions, and the like. There will be. Although explanations have been given using specific numerical examples in order to promote understanding of the invention, these numerical values are merely examples and any appropriate value may be used unless otherwise specified. The classification of items in the above description is not essential to the present invention, and the items described in two or more items may be used in combination as necessary, and the items described in one item may be used in another item. May apply (as long as there is no conflict) to the matters described in. The boundary of the functional part or the processing part in the functional block diagram does not always correspond to the boundary of the physical component. The operation of the plurality of functional units may be physically performed by one component, or the operation of one functional unit may be physically performed by a plurality of components. Regarding the processing procedure described in the embodiment, the processing order may be changed as long as there is no contradiction. For convenience of processing, the base station 10 and the terminal 20 have been described with reference to functional block diagrams, but such devices may be implemented in hardware, software, or a combination thereof. The software operated by the processor of the base station 10 according to the embodiment of the present invention and the software operated by the processor of the terminal 20 according to the embodiment of the present invention are random access memory (RAM), flash memory, and read-only memory, respectively. It may be stored in (ROM), EPROM, EEPROM, registers, hard disk (HDD), removable disk, CD-ROM, database, server or any other suitable storage medium.

Further, the notification of information is not limited to the embodiment / embodiment described in the present disclosure, and may be performed by using another method. For example, information notification includes physical layer signaling (for example, DCI (Downlink Control Information), UCI (Uplink Control Information)), higher layer signaling (for example, RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, etc. It may be carried out by broadcast information (MIB (Master Information Block), SIB (System Information Block)), other signals, or a combination thereof. RRC signaling may be referred to as an RRC message, for example, RRC. It may be a connection setup (RRCConnectionSetup) message, an RRC connection reconfiguration (RRCConnectionReconfiguration) message, or the like.

Each aspect / embodiment described in the present disclosure includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), and 5G (5th generation mobile communication). system), FRA (Future Radio Access), NR (new Radio), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)) )), LTE 802.16 (WiMAX®), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth®, and other systems that utilize appropriate systems and have been extended based on these. It may be applied to at least one of the next generation systems. Further, a plurality of systems may be applied in combination (for example, a combination of at least one of LTE and LTE-A and 5G).

The order of the processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in the present specification may be changed as long as there is no contradiction. For example, the methods described in the present disclosure present elements of various steps using exemplary order, and are not limited to the particular order presented.

In some cases, the specific operation performed by the base station 10 in the present specification may be performed by its upper node (upper node). In a network consisting of one or more network nodes having a base station 10, various operations performed for communication with the terminal 20 are performed by the base station 10 and other network nodes other than the base station 10 ( For example, MME, S-GW, etc. are conceivable, but it is clear that it can be done by at least one of these). In the above example, the case where there is one network node other than the base station 10 is illustrated, but the other network node may be a combination of a plurality of other network nodes (for example, MME and S-GW). ..

The information, signals, etc. described in the present disclosure can be output from the upper layer (or lower layer) to the lower layer (or upper layer). Input / output may be performed via a plurality of network nodes.

The input / output information and the like may be stored in a specific location (for example, a memory) or may be managed using a management table. Information to be input / output may be overwritten, updated, or added. The output information and the like may be deleted. The input information or the like may be transmitted to another device.

The determination in the present disclosure may be made by a value represented by 1 bit (0 or 1), by a boolean value (Boolean: true or false), or by comparison of numerical values (for example). , Comparison with a predetermined value).

Software, whether called software, firmware, middleware, microcode, hardware description language, or other names, is an instruction, instruction set, code, code segment, program code, program, subprogram, software module. , Applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, features, etc. should be broadly interpreted.

Further, software, instructions, information, etc. may be transmitted and received via a transmission medium. For example, a website where the software uses at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL: Digital Subscriber Line), etc.) and wireless technology (infrared, microwave, etc.). When transmitted from a server or other remote source, at least one of these wired and wireless technologies is included within the definition of transmission medium.

The information, signals, etc. described in this disclosure may be represented using any of a variety of different techniques. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description are voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these. It may be represented by a combination of.

The terms described in the present disclosure and the terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol may be a signal (signaling). Also, the signal may be a message. Further, the component carrier (CC: Component Carrier) may be referred to as a carrier frequency, a cell, a frequency carrier, or the like.

The terms "system" and "network" used in this disclosure are used interchangeably.

Further, the information, parameters, etc. described in the present disclosure may be expressed using an absolute value, a relative value from a predetermined value, or another corresponding information. It may be represented. For example, the radio resource may be one indicated by an index.

The names used for the above parameters are not limited in any respect. Further, mathematical formulas and the like using these parameters may differ from those expressly disclosed in this disclosure. Since the various channels (eg, PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name, the various names assigned to these various channels and information elements are in any respect limited names. is not.

In this disclosure, "base station (BS: Base Station)", "wireless base station", "base station device", "fixed station", "NodeB", "eNodeB (eNB)", "gNodeB" (GNB) ”,“ access point ”,“ transmission point ”,“ reception point ”,“ transmission / reception point ”,“ cell ”,“ sector ”, Terms such as "cell group," "carrier," and "component carrier" may be used interchangeably. Base stations are sometimes referred to by terms such as macrocells, small cells, femtocells, and picocells.

The base station can accommodate one or more (eg, 3) cells. When a base station accommodates multiple cells, the entire base station coverage area can be divided into multiple smaller areas, each smaller area being a base station subsystem (eg, a small indoor base station (RRH:)). Communication services can also be provided by (Remote Radio Head). The term "cell" or "sector" is a part or all of the coverage area of at least one of the base stations and base station subsystems that provide communication services in this coverage. Point to.

In the present disclosure, terms such as "mobile station (MS: Mobile Station)", "user terminal", "user device (UE: User Equipment)", and "terminal" may be used interchangeably. ..

Mobile stations can be used by those skilled in the art as subscriber stations, mobile units, subscriber units, wireless units, remote units, mobile devices, wireless devices, wireless communication devices, remote devices, mobile subscriber stations, access terminals, mobile terminals, wireless. It may also be referred to as a terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable term.

At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a communication device, or the like. At least one of the base station and the mobile station may be a device mounted on the mobile body, a mobile body itself, or the like. The moving body may be a vehicle (eg, car, airplane, etc.), an unmanned moving body (eg, drone, self-driving car, etc.), or a robot (manned or unmanned). ) May be. It should be noted that at least one of the base station and the mobile station includes a device that does not necessarily move during communication operation. For example, at least one of a base station and a mobile station may be an IoT (Internet of Things) device such as a sensor.

Further, the base station in the present disclosure may be read by the user terminal. For example, the communication between the base station and the user terminal is replaced with the communication between a plurality of terminals 20 (for example, it may be referred to as D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.). Each aspect / embodiment of the present disclosure may be applied to the configuration. In this case, the terminal 20 may have the functions of the base station 10 described above. Further, words such as "up" and "down" may be read as words corresponding to communication between terminals (for example, "side"). For example, the upstream channel, the downstream channel, and the like may be read as a side channel.

Similarly, the user terminal in the present disclosure may be read as a base station. In this case, the base station may have the functions of the above-mentioned user terminal.

The terms "determining" and "determining" used in this disclosure may include a wide variety of actions. "Judgment" and "decision" are, for example, judgment (judging), calculation (calculating), calculation (computing), processing (processing), derivation (deriving), investigation (investigating), search (looking up, search, inquiry). It may include (eg, searching in a table, database or another data structure), ascertaining as "judgment" or "decision". Also, "judgment" and "decision" are receiving (for example, receiving information), transmitting (for example, transmitting information), input (input), output (output), and access. It may include (for example, accessing data in memory) to be regarded as "judgment" or "decision". In addition, "judgment" and "decision" are considered to be "judgment" and "decision" when the things such as solving, selecting, choosing, establishing, and comparing are regarded as "judgment" and "decision". Can include. That is, "judgment" and "decision" may include considering some action as "judgment" and "decision". Further, "judgment (decision)" may be read as "assuming", "expecting", "considering" and the like.

The terms "connected", "coupled", or any variation thereof, mean any direct or indirect connection or connection between two or more elements and each other. It can include the presence of one or more intermediate elements between two "connected" or "combined" elements. The connection or connection between the elements may be physical, logical, or a combination thereof. For example, "connection" may be read as "access". As used in the present disclosure, the two elements use at least one of one or more wires, cables and printed electrical connections, and as some non-limiting and non-comprehensive examples, the radio frequency domain. Can be considered to be "connected" or "coupled" to each other using electromagnetic energy having wavelengths in the microwave and light (both visible and invisible) regions.

The reference signal can also be abbreviated as RS (Reference Signal), and may be called a pilot (Pilot) depending on the applied standard.

The statement "based on" used in this disclosure does not mean "based on" unless otherwise stated. In other words, the statement "based on" means both "based only" and "at least based on".

Any reference to elements using designations such as "first" and "second" as used in this disclosure does not generally limit the quantity or order of those elements. These designations can be used in the present disclosure as a convenient way to distinguish between two or more elements. Therefore, references to the first and second elements do not mean that only two elements can be adopted, or that the first element must somehow precede the second element.

The "means" in the configuration of each of the above devices may be replaced with a "part", a "circuit", a "device", or the like.

When "include", "including" and variations thereof are used in the present disclosure, these terms are as inclusive as the term "comprising". Is intended. Moreover, the term "or" used in the present disclosure is intended not to be an exclusive OR.

The wireless frame may be composed of one or more frames in the time domain. Each one or more frames in the time domain may be referred to as a subframe. The subframe may further be composed of one or more slots in the time domain. The subframe may have a fixed time length (eg, 1 ms) that does not depend on numerology.

The numerology may be a communication parameter applied to at least one of transmission and reception of a signal or channel. Numerology includes, for example, subcarrier interval (SCS: SubCarrier Spacing), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI: Transmission Time Interval), number of symbols per TTI, wireless frame configuration, transmitter / receiver. It may indicate at least one of a specific filtering process performed in the frequency domain, a specific windowing process performed by the transmitter / receiver in the time domain, and the like.

The slot may be composed of one or more symbols (OFDM (Orthogonal Frequency Division Multiplexing) symbol, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbol, etc.) in the time region. Slots may be time units based on numerology.

The slot may include a plurality of mini slots. Each minislot may be composed of one or more symbols in the time domain. Further, the mini-slot may be referred to as a sub-slot. A minislot may consist of a smaller number of symbols than the slot. The PDSCH (or PUSCH) transmitted in time units larger than the minislot may be referred to as PDSCH (or PUSCH) mapping type A. The PDSCH (or PUSCH) transmitted using the minislot may be referred to as PDSCH (or PUSCH) mapping type B.

The wireless frame, subframe, slot, minislot and symbol all represent the time unit when transmitting a signal. The radio frame, subframe, slot, minislot and symbol may use different names corresponding to each.

For example, one subframe may be called a transmission time interval (TTI), a plurality of consecutive subframes may be called TTI, and one slot or one minislot may be called TTI. You may. That is, at least one of the subframe and TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (eg, 1-13 symbols), or a period longer than 1 ms. May be. The unit representing TTI may be called a slot, a mini slot, or the like instead of a subframe.

Here, TTI refers to, for example, the minimum time unit of scheduling in wireless communication. For example, in the LTE system, the base station schedules each terminal 20 to allocate radio resources (frequency bandwidth that can be used in each terminal 20, transmission power, etc.) in TTI units. The definition of TTI is not limited to this.

TTI may be a transmission time unit such as a channel-encoded data packet (transport block), a code block, or a code word, or may be a processing unit such as scheduling or link adaptation. When a TTI is given, the time interval (for example, the number of symbols) to which the transport block, code block, code word, etc. are actually mapped may be shorter than the TTI.

When one slot or one mini slot is called TTI, one or more TTIs (that is, one or more slots or one or more mini slots) may be the minimum time unit for scheduling. Further, the number of slots (number of mini-slots) constituting the minimum time unit of the scheduling may be controlled.

A TTI having a time length of 1 ms may be referred to as a normal TTI (TTI in LTE Rel. 8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a slot, or the like. A TTI shorter than a normal TTI may be referred to as a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a minislot, a subslot, a slot, or the like.

The long TTI (eg, normal TTI, subframe, etc.) may be read as a TTI having a time length of more than 1 ms, and the short TTI (eg, shortened TTI, etc.) may be read as a TTI less than the TTI length of the long TTI and 1 ms. It may be read as TTI having the above TTI length.

The resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or a plurality of continuous subcarriers in the frequency domain. The number of subcarriers contained in the RB may be the same regardless of the numerology, and may be, for example, 12. The number of subcarriers contained in the RB may be determined based on numerology.

Further, the time domain of the RB may include one or more symbols, and may have a length of 1 slot, 1 mini slot, 1 subframe, or 1 TTI. Each 1TTI, 1 subframe, etc. may be composed of one or a plurality of resource blocks.

One or more RBs include a physical resource block (PRB: Physical RB), a sub-carrier group (SCG: Sub-Carrier Group), a resource element group (REG: Resource Element Group), a PRB pair, an RB pair, and the like. May be called.

Further, the resource block may be composed of one or a plurality of resource elements (RE: Resource Element). For example, 1RE may be a radio resource area of 1 subcarrier and 1 symbol.

The bandwidth part (BWP: Bandwidth Part) (which may also be called partial bandwidth) may represent a subset of consecutive common resource blocks (RBs) for a certain neurology in a carrier. Here, the common RB may be specified by the index of the RB with respect to the common reference point of the carrier. PRBs may be defined in a BWP and numbered within that BWP.

The BWP may include a BWP for UL (UL BWP) and a BWP for DL (DL BWP). One or more BWPs may be set in one carrier for the UE.

At least one of the configured BWPs may be active and the UE may not expect to send or receive a given signal / channel outside the active BWP. In addition, "cell", "carrier" and the like in this disclosure may be read as "BWP".

The above-mentioned structures such as wireless frames, subframes, slots, mini slots and symbols are merely examples. For example, the number of subframes contained in a radio frame, the number of slots per subframe or radioframe, the number of minislots contained within a slot, the number of symbols and RBs contained in a slot or minislot, included in the RB. The number of subcarriers, the number of symbols in the TTI, the symbol length, the cyclic prefix (CP: Cyclic Prefix) length, and other configurations can be changed in various ways.

In the present disclosure, if articles are added by translation, for example, a, an and the in English, the disclosure may include the plural nouns following these articles.

In the present disclosure, the term "A and B are different" may mean "A and B are different from each other". The term may mean that "A and B are different from C". Terms such as "separate" and "combined" may be interpreted in the same way as "different".

Each aspect / embodiment described in the present disclosure may be used alone, in combination, or may be switched and used according to the execution. Further, the notification of predetermined information (for example, the notification of "being X") is not limited to the explicit one, but is performed implicitly (for example, the notification of the predetermined information is not performed). May be good.

Although the present disclosure has been described in detail above, it is clear to those skilled in the art that the present disclosure is not limited to the embodiments described in the present disclosure. The present disclosure may be implemented as amendments and modifications without departing from the spirit and scope of the present disclosure, which is determined by the description of the scope of claims. Therefore, the description of this disclosure is for purposes of illustration and does not have any limiting meaning to this disclosure.

10 Base station 110 Transmitter 120 Receiver 130 Setting unit 140 Control unit 20 Terminal 210 Transmitter 220 Receiver 230 Setting unit 240 Control unit 1001 Processor 1002 Storage device 1003 Auxiliary storage device 1004 Communication device 1005 Input device 1006 Output device

Claims

A receiver that receives an instruction to activate a secondary cell from a base station in a cell other than the secondary cell, and
A terminal having a control unit that assumes a reduction in the delay from receiving the instruction to activating the secondary cell based on the characteristics applicable to the secondary cell.
When the activated cell exists in the group of cells having similar characteristics to the secondary cell specified in advance, the control unit receives the instruction based on the characteristics of the activated cell. The terminal according to claim 1, wherein the delay from the time of activation to the activation of the secondary cell is shortened.
When a cell having characteristics similar to those of the secondary cell specified in advance is activated, the control unit receives the instruction and then activates the secondary cell based on the characteristics of the similar cell. The terminal according to claim 1, which is assumed to shorten the delay until.
Cells with similar characteristics are classified into several stages based on the degree of similarity.
The terminal according to claim 2, wherein the control unit greatly shortens the delay as the degree of similarity increases.
When the elapsed time from the operation of the secondary cell is less than the threshold value, the control unit receives the instruction and then sets the secondary cell based on the characteristics measured before the operation of the reference. The terminal according to claim 1, wherein the delay until activation is assumed to be shortened.
A reception procedure for receiving an instruction to activate a secondary cell from a base station in a cell other than the secondary cell, and
A communication method in which a terminal executes a control procedure that assumes a reduction in the delay from receiving the instruction to activating the secondary cell based on the characteristics applicable to the secondary cell.