WO2020008636A1 - User terminal and wireless communication method - Google Patents

Abstract

A user terminal according to one aspect of the present disclosure is characterized by having: a reception unit that receives a sleep signal (GTS: Go-to-sleep Signal); and a control unit that controls the transition from a non-low-power-consumption mode to a low-power-consumption mode on the basis of the GTS. Due to this aspect, the operation mode can be controlled appropriately.

Description

User terminal and wireless communication method

The present disclosure relates to a user terminal and a wireless communication method in a next-generation mobile communication system.

In a UMTS (Universal Mobile Telecommunications System) network, long term evolution (LTE: Long Term Evolution) has been specified for the purpose of higher data rates and lower delays (Non-Patent Document 1). Also, LTE-A (LTE Advanced, LTE @ Rel. 10, 11, 12, 13) has been specified for the purpose of further increasing the capacity and sophistication of LTE (LTE @ Rel. 8, 9).

Succession system of LTE (for example, FRA (Future Radio Access), 5G (5th generation mobile communication system), 5G + (plus), NR (New Radio), NX (New radio access), FX (Future generation radio access), LTE Rel. 14 or 15).

By the way, in LTE, the RRC state of the UE is classified into the following three according to the connection state between the UE and the network: a connected (Connected) mode, a C-DRX (Connected @ DRX (Discontinuous @ Reception)) mode, and an idle ( Idle) mode. The UE performs the intermittent operation in the C-DRX mode while maintaining the RRC connection. Thereby, low power consumption operation of the UE is expected.

For を NR, control using the C-DRX mode is being studied. However, based on the UE operation studied so far, there is a problem in terms of power reduction and scheduling flexibility with respect to transitions between connected mode and C-DRX mode.

Therefore, an object of the present disclosure is to provide a user terminal and a wireless communication method that can appropriately control an operation mode.

A user terminal according to an aspect of the present disclosure includes a receiving unit that receives a sleep signal (GTS: Go-To-sleep @ Signal), and switches from a non-low power consumption operation mode to a low power consumption operation mode based on the GTS. And a control unit for controlling the transition.

According to one aspect of the present disclosure, the operation mode can be appropriately controlled.

1A and 1B are diagrams illustrating an example of LTE DRX control. 2A and 2B are diagrams illustrating an example of the GTS monitoring time. FIG. 3 is a diagram illustrating an example of a schematic configuration of the wireless communication system according to the embodiment. FIG. 4 is a diagram illustrating an example of the entire configuration of the base station according to the embodiment. FIG. 5 is a diagram illustrating an example of a functional configuration of the base station according to the embodiment. FIG. 6 is a diagram illustrating an example of the entire configuration of the user terminal according to the embodiment. FIG. 7 is a diagram illustrating an example of a functional configuration of the user terminal according to the embodiment. FIG. 8 is a diagram illustrating an example of a hardware configuration of the base station and the user terminal according to the embodiment.

(CORESET)
In NR, in order to transmit a physical layer control signal (for example, downlink control information (DCI: Downlink Control Information)) from a base station to a user terminal (UE: User Equipment), a control resource set (CORESET: Control) is used. REsource SET) is used.

$ CORESET is an allocation candidate area for a control channel (for example, PDCCH (Physical Downlink Control Channel)). The coreset may be configured to include a predetermined frequency domain resource and a time domain resource (for example, one or two OFDM symbols).

The UE may receive the configuration information of the coreset (which may be referred to as coreset configuration (coreset configuration) or coreset-config) from the base station. The UE can detect the physical layer control signal by monitoring the coreset set in the own terminal.

The CORESET setting may be notified by, for example, higher layer signaling, or may be represented by a predetermined RRC information element (which may be called “ControlResourceSet”).

Here, the upper layer signaling may be, for example, any of RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, broadcast information, or a combination thereof.

The MAC signaling may use, for example, a MAC control element (MAC CE (Control Element)), a MAC PDU (Protocol Data Unit), or the like. The broadcast information may be, for example, a master information block (MIB: Master @ Information @ Block), a system information block (SIB: System @ Information @ Block), a minimum system information (RMSI: Remaining @ Minimum @ System @ Information), or the like.

The CORESET may be set to a predetermined number (for example, three or less) for each bandwidth portion (BWP: Bandwidth Part) set for the UE in the serving cell.

ＢHere, BWP is a partial band set in a carrier (also called a cell, a serving cell, a component carrier (CC: Component Carrier), etc.), and is also called a partial band. The BWP may include a BWP for uplink (UL: Uplink) (UL @ BWP, uplink BWP) and a BWP for downlink (DL: Downlink) (DL @ BWP, downlink BWP). Each BWP to which the predetermined number of coresets are given may be DL BWP.

The coreset configuration may mainly include information on the PDCCH resource-related configuration and the RS-related configuration. The following parameters may be provided to the UE for higher CORESET # p (eg, 0 ≦ p <3) set in each DL BWP by higher layer signaling (CORESET setting). That is, the following parameters may be notified (set) to the UE for each CORESET:
A CORESET identifier (CORESET-ID (Identifier)),
A scramble ID of a demodulation reference signal (DMRS) for a PDCCH,
A CORESET time length (eg, time duration, CORESET-time-duration) indicated by the number of consecutive symbols (consecutive);
Frequency-domain Resource Allocation (for example, information (CORESET-freq-dom) indicating a predetermined number of resource blocks constituting CORESET),
A mapping type (information indicating interleaving or non-interleaving) from a control channel element (CCE: Control Channel Element) in the RESET to a resource element group (REG: Resource Element Group) (for example, CORESET-CCE-to-REG-mapping) -type),
Information indicating the size (the number of REGs in the REG bundle) of a group (REG bundle) including a predetermined number of REGs (eg, CORESET-REG-bundle-size);
Information indicating a cyclic shift (CS: Cyclic Shift, CS amount or CS index) for the interleaver of the REG bundle (eg, CORESET-shift-index);
A PDCCH transmission configuration notification (TCI: Transmission Configuration Indication) state (also referred to as an antenna port QCL information (antenna port QCL) of a DMRS antenna port for PDCCH reception);
-An indication (for example, TCI-PresentInDCI) of the presence or absence of a TCI field in DCI (for example, DCI format 1_0 or DCI format 1_1) transmitted by PDCCH in CORRESET # p.

Note that “CORESET-ID # 0” may indicate a RESET (may be called an initial RESET, a default RESET, or the like) set using the MIB.

(Search space)
A search area and a search method for PDCCH candidates are defined as a search space (SS). One SS may correspond to a PDCCH candidate corresponding to one or a plurality of aggregation levels (AL: Aggregation Level). Here, the AL may represent the number of control channel elements (CCEs) allocated to the PDCCH. Further, the PDCCH candidate may mean a PDCCH in a position where the PDCCH in the SS is transmitted or a specific position in the SS. One or more SSs may be referred to as an SS set.

The UE may receive search space configuration information (which may be referred to as search space configuration (search space configuration)) from the base station. The search space configuration may be notified to the UE by, for example, higher layer signaling (eg, RRC signaling) or may be represented by a predetermined RRC information element (which may be referred to as “SearchSpace”).

Note that “search space”, “search space set”, “search space setting”, “search space set setting”, and the like in the present disclosure may be interchanged with each other.

The search space configuration mainly includes information on the monitoring-related configuration and the decoding-related configuration of the PDCCH, and may include, for example, information on at least one of the following:
-Search space identifier (search space ID),
An identifier of a reset associated with the search space setting (coreset-id);
Information indicating whether a common search space (C-SS: Common SS) or a UE-specific search space (UE-SS: UE-specific SS);
The number of PDCCH candidates for each AL,
・ Monitoring cycle,
Monitoring offset,
A monitoring pattern in the slot (eg a 14 bit bitmap).

UE monitors CORESET based on search space setting. The UE can determine the correspondence between the RESET and the search space based on the RESET-ID included in the search space setting. One coreset may be associated with one or more search spaces.

Note that, in the present disclosure, “monitor of CORESET”, “monitor of search space (PDCCH candidate) associated with CORESET”, “monitor of downlink control channel (for example, PDCCH)”, and “monitor of downlink control information (DCI)” "May be read as each other. “Monitor” may be read as “at least one of blind decoding and blind detection”.

(DRX)
By the way, in LTE, the RRC state of the UE is classified into the following three according to the connection state between the UE and the network: a connected (Connected) mode, a C-DRX (Connected DRX (Discontinuous Reception)) mode, and an idle ( Idle) mode.

The connection mode corresponds to, for example, a state where transmission and reception can be performed using radio resources secured by the base station. The UE transitions to the C-DRX mode in order to reduce power consumption when there is no up / down communication for a certain period of time in the connection mode. The UE performs intermittent operation in C-DRX while maintaining the RRC connection. The UE returns to the connection mode (non-intermittent operation) when uplink or downlink communication occurs during the C-DRX state.

A UE in the ON period of the C-DRX mode (ON duration) may be called active (active state) or may be called awake (waking up). An active UE monitors the PDCCH and transmits channel state information (CSI: Channel \ State \ Information) and an uplink reference signal (SRS: Sounding \ Reference \ Signal). In addition, when a predetermined timer (drx-InactivityTimer), which will be described later, is running, it also corresponds to the active state. An active UE may be described as a UE during an active time (active @ time).

On the other hand, a UE in the off state of the C-DRX mode may be called inactive (inactive) (or inactive state) or may be called sleeping. Good. Inactive UEs do not monitor the PDCCH and do not transmit CSI and SRS. Thereby, power consumption of the UE can be suppressed.

FIGS. 1A and 1B are diagrams showing an example of DRX control of LTE. Note that FIG. 1A shows a case where the UE transitions (transitions) to the C-DRX mode due to expiration of drx-inactivityTimer, and FIG. 1B shows a MAC control element (DRX \ command \ MAC \ control \ Element) instructing a transition to the DRX state. The case where a user terminal changes to intermittent reception is shown.

The DRX cycle may correspond to a cycle obtained by combining an ON period and an OFF period (or a sleep period) following the ON period. As the DRX cycle, a short cycle (parameters such as shortDRX-cycle and drx-ShortCycle may be used), a long cycle (parameters such as longDRX-cycle and drx-LongCycle may be used) and the like for the UE. May be set by higher layer signaling.

In FIG. 1A, when the UE successfully decodes the PDCCH instructing new DL reception or UL transmission, the UE starts a predetermined timer (drx-InactivityTimer). The UE remains active until the timer expires. If the UE successfully decodes the PDCCH that instructs the UE to perform a new DL reception or UL transmission before the timer expires, the UE restarts the timer.

When the timer expires, the UE starts a DRX cycle at a predetermined timing (for example, a subframe satisfying a specific condition) (transition to C-DRX mode). The UE starts an on-period timer (drx-onDurationTimer) at the start timing of the DRX cycle. The UE for which the on-period timer is running is active.

It should be noted that, for example, transmission is performed on the PUCCH during a period in which a DL retransmission timer (drx-RetransmissionTimerDL), a UL retransmission timer (drx-RetransmissionTimerUL), a random access collision resolution timer (ra-ContentionResolutionTimer), and the like are active. The UE may be active during a period when the scheduling request is pending (pending), during a period after successful reception of the random access response and before receiving a predetermined PDCCH, and the like.

Further, as shown in FIG. 1B, even before the timer expires, the UE starts a DRX cycle when a predetermined MAC control element (DRX MAC CE: DRX command MAC control element) is received. . That is, the UE that has received DRX @ MAC @ CE may forcibly stop the timer and transition to the C-DRX mode.

For を NR, control using the C-DRX mode is being studied. For example, it is considered that the UE monitors a PDCCH candidate according to the setting of the set SS set at a monitoring opportunity (monitoring @ occasion) during the ON period of the C-DRX mode. The transition to the C-DRX mode discussed so far is the same as in FIGS. 1A and 1B.

However, the transition from the connection mode based on the timer or the MAC $ CE as shown in FIGS. 1A and 1B to the C-DRX mode requires a relatively long time. In addition, the active state is maintained when some kind of communication is occurring, so that power may not be effectively reduced.

Moreover, since transition from the C-DRX mode to the connection mode is not performed unless a PDCCH indicating a new UL or DL is detected, a UE without data communication cannot be shifted to the connection mode.

For this reason, the conventional DRX control has problems in terms of power reduction and scheduling flexibility.

Therefore, the present inventors have conceived a new control signal and a related UE operation for suitably switching an operation mode for reducing power consumption of the UE.

Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the drawings. The wireless communication method according to each embodiment may be applied alone or in combination.

Hereinafter, C-DRX is also simply referred to as DRX.

(Wireless communication method)
In the present disclosure, a UE operation based on a wake-up signal (WUS: Wake-Up-Signal), a sleep signal (GTS: Go-To-sleep-Signal) and the like will be described. WUS may be called a wake-up signal, a wake-up signal, or the like. The GTS may be called a sleep signal, a sleep signal, or the like.

WUS may be used, for example, to transition the state of the UE from the DRX mode to the non-DRX mode. Upon detecting WUS, the UE may transition to a non-DRX mode (eg, a connected mode). For example, upon detecting WUS, the UE may activate (or restart) the drx-InactivityTimer. Further, the UE may use WUS for at least one of synchronization, measurement, AGC setting, channel estimation, and the like.

The GTS may be used, for example, to transition the state of the UE from the non-DRX mode to the DRX mode. When detecting the GTS, the UE may transition to the DRX mode. Also, the UE may use the GTS for at least one of synchronization, measurement, AGC setting, channel estimation, and the like.

GTS and WUS may be transmitted periodically or aperiodically. In the former case, the UE may set information on at least one of the GTS / WUS cycle and offset using higher layer signaling. Note that aperiodic transmission may be called on-demand transmission.

$ WUS may be called a wake-up channel (WUCH: Wake-Up @Channel), a wake-up channel, or the like. The GTS may be called a sleep channel (GTCH: Go-To-sleep @ Channel), a sleep channel, or the like.

The following mainly describes the GTS.

[GTS when DRX is set]
The UE may be configured for DRX and GTS. The GTS may be set in the UE when at least one of a short-period DRX cycle (drx-ShortCycle) and a long on-period timer is set.

When the GTS is transmitted periodically, the UE monitors the GTS during at least one of the ON period, the active time, the inactive time, and the idle time of the DRX based on the settings of the DRX cycle, the offset, and the like described above. May be. The monitoring cycle and monitoring time of the GTS may be determined based on the DRX setting, or may be determined independently (independently) of the DRX setting. For example, the UE may assume that the monitoring time of the GTS overlaps the DRX on period.

Note that the UE may periodically monitor the GTS based on information (for example, setting information such as a cycle, a monitoring time, and an offset) on the GTS described below that is set independently of the DRX setting information.

When the GTS is transmitted on demand, the UE may monitor the GTS during at least one of the DRX on period and the active time.

Note that, when monitoring the GTS in a certain period (on period, active time, inactive time, idle time), the UE may monitor the GTS over the entire period or a part of the period (for example, The GTS may be monitored at the beginning or end X symbol, the beginning or end X slot). The time for monitoring (or detecting) the GTS may be referred to as a GTS monitoring time (GTS @ monitoring @ occasion), a GTS detection time (GTS @ detection @ occasion), or the like.

FIGS. 2A and 2B are diagrams illustrating an example of the GTS monitoring time. FIG. 2A corresponds to the case where the GTS is transmitted on demand, and FIG. 2B corresponds to the case where the GTS is transmitted periodically.

ＡIn FIG. 2A, the GTS monitoring time is the same as the DRX ON period or a part of the DRX ON period. That is, the UE attempts to detect the GTS during the DRX ON period. When the GTS monitoring time is a part of the DRX on-period, the UE transmits the GTS in any part of the DRX on-period (for example, one or more symbols, slots, subframes, sections represented by ms, etc.). Whether to monitor may be set by higher layer signaling or the like.

に お い て In FIG. 2B, the GTS monitoring time may or may not overlap with the DRX ON period. The GTS monitoring cycle may be the same as or different from the DRX cycle (FIG. 2B is a different example). In addition, the GTS monitoring time for each GTS monitoring cycle may be a predetermined time length (for example, one or more symbols, one or more slots).

The UE may monitor the PDCCH using the existing PDCCH monitoring method even at a time overlapping with the GTS monitoring time. For example, even when the UE is set to monitor the GTS during the DRX on-period, the UE may monitor the set search space set (PDCCH candidate) in the on-period simultaneously with the GTS monitoring. .

In addition, the UE sets information (hereinafter, also referred to as DRX mode monitor information) on the PDCCH (or PDCCH candidate) to be monitored during the ON period of DRX using higher layer signaling, physical layer signaling, or a combination thereof. Is also good. Even when the UE is set to monitor the GTS during the DRX ON period, the UE may use some of the set search space sets (PDCCH candidates) based on the DRX mode monitor information. May be monitored during the ON period simultaneously with the monitoring of the GTS.

In the present disclosure, “for the DRX mode”, “in the DRX mode” and the like may be read as “while the on-period timer is running” and “in the active state during the DRX cycle”.

The DRX mode monitor information may be any of the following or a combination thereof:
Information on one or more SS sets to monitor in DRX mode,
Information on one or more SS (AL) to monitor in DRX mode,
Information on one or more PDCCH candidates to monitor in DRX mode,
One or more coreset information to monitor in DRX mode;
Information on one or more BWPs to monitor in DRX mode;
Information on one or more CCs to be monitored in DRX mode.

The UE does not have to monitor the corresponding PDCCH candidate in the ON period for the SS set / SS / PDCCH candidate / CORESET / BWP / CC in which nothing is set for the monitoring of the DRX mode.

Note that the above “monitor... Information” may be replaced with “not monitor... Information”. In this case, the UE may monitor the SS set / SS / PDCCH candidate / CORESET / BWP / CC in which nothing is set for monitoring in the DRX mode during the ON period.

PDCCH candidate information (DRX mode monitor information) monitored (or not) simultaneously with the GTS as described above includes SS set setting information (RRC SearchSpace information element), CORESET setting information (RRC ControlResourceSet information element), BWP The UE may be included in at least one of configuration information (for example, downlink BWP configuration information (RRP BWP-Downlink information element)) and serving cell configuration information (RRC ServingCellConfig information element). .

The DRX mode monitor information is notified to the UE by using other information (included in another information element) other than the above-described SS set setting information, CORESET setting information, BWP setting information, serving cell setting information, and the like. May be done. In that case, the DRX mode monitor information may include information for specifying at least one of the SS set, SS (AL), PDCCH candidate, CORESET, BWP, and CC to be monitored (or not to be monitored).

The information of the SS set may be expressed in at least one of a DCI format to be monitored and an RNTI (Radio Network Temporary Identifier) corresponding to the DCI format. The UE may monitor the SS set corresponding to the set DCI format or RNTI during the ON period, or may monitor the SS set other than the SS set corresponding to the set DCI format or RNTI during the ON period. Good.

Further, the DRX mode monitor information may be determined in advance by specifications. For example, the UE may monitor a PDCCH candidate corresponding to any of the following or a combination thereof in the ON period at the same time as monitoring the GTS, or may perform control not to monitor the PDCCH candidate:
PDCCH candidates included in a specific SS set (for example, an SS set corresponding to search space set ID # 0),
A PDCCH candidate included in a specific SS (AL) (eg, SS corresponding to search space ID # 0, SS corresponding to AL = 1, etc.),
A specific PDCCH candidate (for example, a PDCCH candidate corresponding to PDCCH candidate index # 0),
A PDCCH candidate included in a specific coreset (for example, coreset corresponding to coreset-ID # 0);
A PDCCH candidate included in a specific BWP (for example, a BWP corresponding to BWP # 0);
PDCCH candidates included in a specific CC (for example, a CC corresponding to cell index # 0),
A PDCCH candidate corresponding to a specific DCI format,
A PDCCH candidate corresponding to a specific RNTI.

Note that “included” may be read as “not included”. In addition, when the DRX mode monitor information is defined in the specification, even if there is another PDCCH candidate to be monitored, the UE does not need to monitor the PDCCH candidate during the ON period at the same time as monitoring the GTS. Good.

[[BWP / carrier monitoring GTS]]
The UE may determine the BWP for monitoring the GTS according to at least one of the following:
(1) Default or initial BWP,
(2) a specific BWP set by higher layer signaling,
(3) a currently active BWP (eg, a BWP that monitors PDCCH candidates during the DRX on period);
(4) All DL BWPs where GTS may be transmitted.

The UE may expect the GTS to be transmitted with a predetermined SCS in the default / initial BWP of (1). The predetermined SCS may be determined by specifications, or may be set in the UE by higher layer signaling or the like.

The setting information of the specific BWP in the above (2) may include a GTS bandwidth (BW) and an SCS.

The UE may assume that the CC monitoring the GTS is a CC including the BWP to be monitored, or assume that the CC is a CC set to monitor the GTS using higher layer signaling or the like. May be.

[[Operation based on GTS detection]]
If a GTS is detected in at least one BWP / CC, the UE may be one or more (eg, all) CCs (active CCs, configured CCs, etc.) associated with the BWP / CC. ), A transition may be made from the non-DRX mode to the DRX mode until a predetermined period, for example, the next GTS monitoring time (which may be a GTS transmission time) (the DRX mode is maintained until the next GTS monitoring time). Good).

The next GTS monitoring time may mean, for example, the next DRX ON period when the GTS is transmitted on demand, or the next GTS monitoring period when the GTS is transmitted periodically. It may mean a monitoring period in a cycle.

Alternatively, the predetermined period may be, for example, a DRX cycle (DRX cycle) based on another DRX setting. For example, a UE in which two DRXs are set performs DRX control by a first DRX setting based on the presence or absence of PDCCH detection. When the DRX timer based on the first DRX setting expires, a DRX cycle is started at a predetermined timing (for example, a subframe or a slot satisfying a specific condition) based on the first DRX setting (first DRX cycle). Mode). When a GTS is detected in the first DRX mode, the UE may transition to a DRX mode based on a second DRX setting (second DRX mode). The first DRX is a DRX mode with a short DRXＤＲcycle, the second DRX is a long DRX mode with a DRX cycle, and GTS is transmitted and received during the first DRX mode, thereby further reducing terminal power consumption. It becomes.

If the GTS is detected in a control unit, the UE transitions from the non-DRX mode to the DRX mode for the relevant one or more (eg, all) CCs in the control unit until the next GTS monitoring time. Is also good. Here, the predetermined control unit may be, for example, any one of a CC, a CC group, a MAC entity, a cell group, a PUCCH group, a frequency range (FR: Frequency） Range), a band, or a combination thereof. The predetermined control unit may be simply called a group.

The transition to the DRX mode based on the GTS may be performed regardless of whether the UE detects the PDCCH at the same timing as the detection of the GTS.

In addition, the transition to the DRX mode based on the GTS is performed by the UE at a same timing as the detection of the GTS at a predetermined PDCCH (for example, a UE-specific PDCCH for transmitting the DCI for PDSCH / PUSCH scheduling of the UE). May be determined based on whether or not to perform the detection. For example, the transition to the DRX mode based on the GTS may not be performed when the UE detects the UE-specific PDCCH at the same timing as the detection of the GTS.

When the UE detects the PDCCH simultaneously with or before or after the detection of the GTS and the PDCCH or the process based on the PDCCH is not completed, the UE may perform any of the following operations. Good:
Complete the process (eg, do not make a transition based on GTS until the process is completed);
-Cancel the process as soon as possible. After the suspension, a transition based on the GTS may be performed.
-Depends on UE implementation.

The processing based on the PDCCH includes, for example, reception processing (for example, decoding and demodulation) of a PDSCH scheduled by the PDCCH, transmission processing (for example, encoding and modulation) of HARQ-ACK corresponding to the PDSCH, and PDCCH. It may include a transmission process of the PUSCH to be scheduled.

ＵＥ Further, the UE may or may not transmit an HARQ-ACK (eg, NACK) corresponding to the above process after the above process is stopped.

[GTS when DRX is not set]
The UE may be configured with GTS even when DRX is not configured. In this case, the US does not set parameters such as the DRX cycle and the ON period timer.

A UE for which GTS is set without setting DRX may be operable in at least a low power consumption operation mode and a non-low power consumption operation mode (for example, a connection mode).

The low power consumption operation mode may mean a mode in which the power consumption of the UE is expected to be lower than in the connection mode. The low power consumption operation mode may be called, for example, a power saving (power （efficient) mode, or another name may be used.

The non-low power consumption operation mode may be called a network access mode, a high power consumption operation mode, a normal mode, a connection mode, or the like, or another name may be used.

The GTS may be used, for example, to change the state of the UE from a high power consumption operation mode to a low power consumption operation mode. The UE in the high power consumption operation mode may monitor the GTS at a specific timing. When detecting the GTS, the UE may transition to the low power consumption operation mode. The UE may use the GTS for at least one of synchronization, measurement, AGC configuration, channel estimation, and the like.

Note that for at least one of the transition from the high power consumption mode to the low power consumption mode and vice versa, the time required for the transition may be determined based on a parameter set by higher layer signaling. , May be predetermined by the specification, or may depend on the UE implementation.

The UE that has transitioned from the high power consumption operation mode to the low power consumption operation mode may perform at least one of the following:
Stop monitoring the PDCCH as soon as possible and performing certain types of measurements or any measurements,
Stop performing certain types of uplink transmissions or any uplink transmissions as early as possible;
Flush (empty) the HARQ buffer.

The timing of stopping the execution of the monitoring, measurement, uplink transmission, and the like of the PDCCH may be terminal-implemented, or the timing or a period in which the timing can be taken is clearly defined by the specification, and the UE The monitoring or the like may be stopped during the timing or the period when the timing can be taken. In this case, the timing of stopping monitoring of the PDCCH or the possible period may be determined depending on the subcarrier interval of at least one of the GTS and the PDCCH. The timing or possible period for stopping the implementation of the uplink transmission or the like may be determined depending on the GTS, the uplink transmission signal, and at least one subcarrier interval of the channel.

Also, if the UE instructed to stop monitoring of the PDCCH by the GTS detects the PDCCH during a period from receiving the instruction to stopping the PDCCH, the UE ignores the instruction of the PDCCH and follows the PDCCH according to the GTS. Monitoring may be stopped. Alternatively, when the PDCCH is detected during a period from receiving the instruction to stopping these, the GTS instruction may be ignored and the suspension such as monitoring of the PDCCH may be canceled.

If the UE instructed by the GTS to stop the execution of the uplink transmission or the like is instructed by the PDCCH or the like during the period from receiving the instruction until stopping the UE, the PDCCH instruction May be ignored and uplink transmission or the like may be stopped according to the GTS. Alternatively, when the PDCCH is detected during a period from receiving the instruction to stopping them, the GTS instruction may be ignored, and the suspension of the uplink transmission or the like may be canceled.

Note that the UE may determine whether to perform these operations at the time of transition to the low power consumption operation mode based on higher layer signaling. For example, the UE may determine whether to flush the HARQ buffer based on higher layer settings.

The UE in the high power consumption operation mode may monitor the PDCCH based on the PDCCH setting, for example.

When the GTS is transmitted periodically, the UE may monitor the GTS based on information about the GTS described later (for example, setting information such as a cycle, a monitoring time, and an offset).

When the UE is set to monitor the GTS and the GTS monitoring time and the PDCCH monitoring time overlap (collide), the UE monitors information on the PDCCH (or PDCCH candidate) (hereinafter referred to as a low power consumption operation). Mode monitor information) may be set using higher layer signaling, physical layer signaling, or a combination thereof. If the UE is configured not to set DRX but to monitor the GTS, the UE may use some of the set PDCCH candidates in the set search space set (PDCCH candidates) based on the low power consumption operation mode. May be monitored simultaneously with the monitoring of the GTS.

モ ニ タ Also, the monitor information for the low power consumption operation mode may be determined in advance in the specification.

The low power consumption operation mode monitor information may correspond to the DRX mode monitor information in which the DRX mode is replaced with the low power consumption operation mode. Further, the UE operation based on the monitor information for the low power consumption operation mode may correspond to the operation in which the DRX mode is replaced with the low power consumption operation mode with respect to the UE operation based on the monitor information for the DRX mode.

Ｂ The BWP / carrier for monitoring the GTS, the operation based on the GTS detection, and the like may be the same as those described above for the GTS when DRX is set.

For example, when the UE detects a GTS in a CC corresponding to a certain control unit (for example, any one of CC, CC group, MAC entity, cell group, PUCCH group, FR, band, or a combination thereof), At least one BWP may be activated for the associated active CC (or configured CC) of the control unit:
(I) default or initial BWP,
(Ii) a specific BWP set by higher layer signaling,
(Iii) the latest active BWP for the CC,
(Iv) For a CC that has detected a GTS, one or more BWPs (first BWP set) determined based on the GTS. For other active CCs (or other configured CCs), one or more BWPs corresponding to the same BWP index as the first BWP set (second BWP set), default BWP, initial BWP, latest BWP One of the active BWPs.

The following description of the embodiment may be applied when DRX is set or may be applied when DRX is not set.

[QCL]
The UE may assume that the GTS is a QCL with at least one of the following:
(A) a specific synchronization signal block (SSB: Synchronization Signal Block), CSI-RS (Channel State Information-Reference Signal) or RESET (for example, SSB # 0 or RESET # 0);
(B) SSB, CSI-RS or RESET set by higher layer signaling,
(C) the last detected PDCCH in the BWP where the GTS was detected,
(D) PDCCH monitored during at least one of the DRX on period and the DRX active time. The PDCCH may or may not be a PDCCH monitored at the same time as the GTS.
(E) WUS.

The SSB may be called an SS / PBCH (Physical Broadcast Channel) block, and may include a PSS (Primary Synchronization Signal), an SSS (Secondary Synchronization Signal), a PBCH, a DMRS for the PBCH, and the like. The CSI-RS is at least one of NZP-CSI-RS (Non-Zero-Power @ CSI-RS), ZP-CSI-RS (Zero-Power @ CSI-RS) and CSI-IM (Interference @ Measurement). Is also good. The SS may be at least one of PSS, SSS and other synchronization signals. Regarding (a) above, the UE may assume that WUS is at least one signal and QCL included in the SSB.

に つ い て Regarding (b) above, the UE may be notified of the SSB, CSI-RS, or RESET, and the QCL (or TCI state) with the GTS, using higher layer signaling, physical layer signaling, or a combination thereof.

[Signal configuration]
The GTS may be a sequence-based signal. The GTS sequence may be determined (generated) based on any of the following or a combination thereof:
A sequence of one or more synchronization signals (eg, PSS, SSS);
A sequence of one or more CSI-RSs (eg, NZP-CSI-RS, ZP-CSI-RS);
A sequence of one or more other reference signals (eg, DMRS, PTRS (Phase Tracking Reference Signal));
Resources of one or more synchronization signals,
One or more CSI-RS resources,
One or more other reference signal resources.

Note that the UE may assume that some or all of the information on the GTS is the same as the parameters of the other setting information (for example, the RESET setting information) (the parameters of the other setting information may be reused). ).

GTS may be a message-based signal. In the case of a message-based signal, it may include a flag bit for identifying WUS / GTS, and the UE may determine whether the detected signal is WUS or GTS based on the flag bit.

The message-based GTS may include a payload portion for storing information and a reference signal for decoding the payload portion (a demodulation reference signal (DMRS: DeModulation Reference Signal)). The payload portion may be multiplexed with the DMRS using at least one of TDM and FDM. The message-based GTS may be notified using a predetermined DCI format.

The payload portion may be scrambled by a cyclic redundancy check (CRC) with a specific identifier (a CRC bit scrambled by a specific identifier may be added). The specific identifier may be called, for example, an identifier for GTS (GTS-RNTI (Radio Network Temporary Identifier)).

The UE may encode the payload portion using a specific encoding method. The specific encoding method is, for example, any one of a repetition code (repetition code), a simplex code (simplex code), a Reed-Muller code (RM code: Reed-Muller code), a polar code, or a combination thereof. May be. The UE may determine the encoding method according to the payload size.

Information about the GTS may be sent to the UE using higher layer signaling, physical layer signaling, or a combination thereof. Information about the GTS may be, for example, information about resources for the GTS (eg, possible PRBs, symbol numbers in slots, slot numbers, BWP / CCs monitoring the GTS, GTS monitoring periods, GTS monitoring times, offsets, times, or Density, frequency direction), an antenna port, a TCI state, an ID for sequence initialization (for example, a scramble ID), and the like.

In addition, when the GTS is a message-based signal, the information on the GTS may further include information on at least one of a payload size, a DMRS density, a GTS identifier, and the like.

GTS is preferably message-based. This is because a message-based signal has higher error resistance than a sequence-based signal and can suppress erroneous GTS detection. If the UE erroneously detects the GTS, an unexpected time during which the UE cannot communicate occurs, so it is preferable to suppress the erroneous detection.

[Mode control related to GTS non-detection / detection]
The UE may maintain the non-DRX mode when the GTS is set and the GTS is not detected, regardless of whether the DRX is set. The unit for maintaining the non-DRX mode may be, for example, any of the following:
One or more CCs (or BWPs) configured to transmit GTS,
One or more CCs (or BWPs) active (or configured);
One or more active (or configured) CCs (or BWPs) associated with one MAC entity;
One or more CCs (or BWPs) active (or configured) in the CC / CC group / cell group / PUCCH group / FR / band.

The UE may automatically transition to the inactive or idle state when detecting a GTS more than a predetermined number of times in a certain period for all active (or configured) CCs (or all BWPs) of the UE. . Note that the UE may or may not transmit information on the automatic transition (for example, a state transition) to the base station.

When the UE detects a GTS more than a predetermined number of times in a predetermined period for all active (or configured) CCs (or all BWPs) of the UE, the UE requests the base station to release (release) the RRC connection. May be transmitted. The UE may transition the RRC state to the inactive or idle state according to an instruction from the base station.

According to such control, the base station can immediately shift the UE to the idle state by continuously transmitting the GTS to the UE.

Note that when the certain period (the time in the non-DRX mode or the timer corresponding to the certain period) is equal to or more than the SCell / BWP inactivity timer, RRC idle timer, or inactivity timer, the GTS May be determined to have been detected. The timer may be started when entering the non-DRX mode.

Note that the information on the predetermined period, the predetermined number of times, and the like may be set in the UE using higher layer signaling or the like, or may be determined in advance by specifications.

<Modification>
DRX (or DRX mode) in the present disclosure may be read as any low power consumption operation (or low power consumption operation mode) of the UE. Also, non-DRX (or non-DRX mode) in the present disclosure may be read as any high power consumption operation (or high power consumption operation mode) of the UE.

(Wireless communication system)
Hereinafter, the configuration of the wireless communication system according to an embodiment of the present disclosure will be described. In this wireless communication system, communication is performed using any of the wireless communication methods according to the above embodiments of the present disclosure or a combination thereof.

FIG. 3 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. In the wireless communication system 1, carrier aggregation (CA) and / or dual connectivity (DC) in which a plurality of basic frequency blocks (component carriers) each having a system bandwidth (for example, 20 MHz) of the LTE system as one unit are applied. can do.

The wireless communication system 1 includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), LTE-B (LTE-Beyond), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), and 5G. (5th generation mobile communication system), NR (New Radio), FRA (Future Radio Access), New-RAT (Radio Access Technology), etc., or a system for realizing these.

The wireless communication system 1 includes a base station 11 forming a macro cell C1 having relatively wide coverage, and a base station 12 (12a to 12c) arranged in the macro cell C1 and forming a small cell C2 smaller than the macro cell C1. Have. Further, user terminals 20 are arranged in the macro cell C1 and each small cell C2. The arrangement, number, and the like of each cell and the user terminals 20 are not limited to the modes shown in the figure.

The user terminal 20 can be connected to both the base station 11 and the base station 12. It is assumed that the user terminal 20 uses the macro cell C1 and the small cell C2 simultaneously using CA or DC. Further, the user terminal 20 may apply CA or DC using a plurality of cells (CCs).

A communication between the user terminal 20 and the base station 11 can be performed using a carrier having a relatively low frequency band (for example, 2 GHz) and a narrow bandwidth (also referred to as an existing carrier or a legacy carrier). On the other hand, between the user terminal 20 and the base station 12, a carrier having a relatively high frequency band (for example, 3.5 GHz, 5 GHz or the like) and a wide bandwidth may be used, or between the user terminal 20 and the base station 11. The same carrier as described above may be used. The configuration of the frequency band used by each base station is not limited to this.

The user terminal 20 can perform communication using time division duplex (TDD: Time Division Duplex) and / or frequency division duplex (FDD: Frequency Division Duplex) in each cell. In each cell (carrier), a single numerology may be applied, or a plurality of different numerologies may be applied.

Numerology may be a communication parameter applied to transmission and / or reception of a certain signal and / or channel, for example, subcarrier interval, bandwidth, symbol length, cyclic prefix length, subframe length. , TTI length, number of symbols per TTI, radio frame configuration, specific filtering processing performed by the transceiver in the frequency domain, specific windowing processing performed by the transceiver in the time domain, and the like. For example, for a certain physical channel, if the subcarrier intervals of the constituent OFDM symbols are different and / or if the number of OFDM symbols is different, the numerology may be referred to as different.

The base station 11 and the base station 12 (or between the two base stations 12) may be connected by a wire (for example, an optical fiber compliant with CPRI (Common Public Radio Interface), an X2 interface, or the like) or wirelessly. Good.

The base station 11 and each base station 12 are connected to the upper station device 30 and are connected to the core network 40 via the upper station device 30. Note that the higher station apparatus 30 includes, for example, an access gateway apparatus, a radio network controller (RNC), and a mobility management entity (MME), but is not limited thereto. Further, each base station 12 may be connected to the upper station device 30 via the base station 11.

Note that the base station 11 is a base station having relatively wide coverage, and may be called a macro base station, an aggregation node, an eNB (eNodeB), a transmission / reception point, or the like. The base station 12 is a base station having local coverage, such as a small base station, a micro base station, a pico base station, a femto base station, a HeNB (Home eNodeB), an RRH (Remote Radio Head), and a transmission / reception point. May be called. Hereinafter, when the base stations 11 and 12 are not distinguished, they are collectively referred to as a base station 10.

Each user terminal 20 is a terminal corresponding to various communication systems such as LTE and LTE-A, and may include not only mobile communication terminals (mobile stations) but also fixed communication terminals (fixed stations).

In the wireless communication system 1, Orthogonal Frequency Division Multiple Access (OFDMA) is applied to the downlink as a wireless access scheme, and Single-Carrier Frequency Division Multiple Access (SC-FDMA: Single Carrier) is applied to the uplink. Frequency Division Multiple Access) and / or OFDMA is applied.

OFDMA is a multicarrier transmission scheme in which a frequency band is divided into a plurality of narrow frequency bands (subcarriers), and data is mapped to each subcarrier to perform communication. SC-FDMA divides a system bandwidth into bands each composed of one or a continuous resource block for each terminal, and a single carrier transmission that reduces interference between terminals by using different bands for a plurality of terminals. It is a method. The uplink and downlink radio access schemes are not limited to these combinations, and other radio access schemes may be used.

In the wireless communication system 1, as downlink channels, a downlink shared channel (PDSCH: Physical Downlink Shared Channel), a broadcast channel (PBCH: Physical Broadcast Channel), a downlink L1 / L2 control channel, and the like shared by each user terminal 20 are used. Used. The PDSCH transmits user data, upper layer control information, SIB (System Information Block), and the like. Also, MIB (Master \ Information \ Block) is transmitted by PBCH.

Downlink L1 / L2 control channels include PDCCH (Physical Downlink Control Channel), EPDCCH (Enhanced Downlink Control Channel), PCFICH (Physical Control Format Indicator Channel), PHICH (Physical Hybrid-ARQ Indicator Channel) and the like. Downlink control information (DCI: Downlink Control Information) including PDSCH and / or PUSCH scheduling information is transmitted by the PDCCH.

Note that DCI for scheduling DL data reception may be referred to as DL assignment, and DCI for scheduling UL data transmission may be referred to as UL grant.

PCFICH transmits the number of OFDM symbols used for PDCCH. The PHICH transmits acknowledgment information (for example, retransmission control information, HARQ-ACK, ACK / NACK, etc.) of HARQ (Hybrid Automatic Repeat Repeat request) for the PUSCH. The EPDCCH is frequency-division multiplexed with a PDSCH (Downlink Shared Data Channel) and used for transmission of DCI and the like like the PDCCH.

In the wireless communication system 1, as an uplink channel, an uplink shared channel (PUSCH: Physical Uplink Shared Channel), an uplink control channel (PUCCH: Physical Uplink Control Channel), a random access channel (PRACH: Physical Random Access Channel) or the like is used. By PUSCH, user data, higher layer control information, etc. are transmitted. Also, downlink radio quality information (CQI: Channel Quality Indicator), delivery confirmation information, scheduling request (SR: Scheduling Request), and the like are transmitted by PUCCH. The PRACH transmits a random access preamble for establishing a connection with a cell.

In the wireless communication system 1, as a downlink reference signal, a cell-specific reference signal (CRS: Cell-specific Reference Signal), a channel state information reference signal (CSI-RS: Channel State Information-Reference Signal), and a demodulation reference signal (DMRS: DeModulation Reference Signal, a position determination reference signal (PRS: Positioning Reference Signal), and the like are transmitted. In the wireless communication system 1, a measurement reference signal (SRS: Sounding Reference Signal), a demodulation reference signal (DMRS), and the like are transmitted as uplink reference signals. The DMRS may be called a user terminal specific reference signal (UE-specific Reference Signal). The transmitted reference signal is not limited to these.

(base station)
FIG. 4 is a diagram illustrating an example of the entire configuration of the base station according to the embodiment. The base station 10 includes a plurality of transmitting / receiving antennas 101, an amplifier unit 102, a transmitting / receiving unit 103, a baseband signal processing unit 104, a call processing unit 105, and a transmission path interface 106. The transmitting / receiving antenna 101, the amplifier unit 102, and the transmitting / receiving unit 103 may be configured to include at least one each.

ユ ー ザ User data transmitted from the base station 10 to the user terminal 20 by downlink is input from the higher station apparatus 30 to the baseband signal processing unit 104 via the transmission path interface 106.

In the baseband signal processing unit 104, regarding user data, processing of a PDCP (Packet Data Convergence Protocol) layer, division / combination of user data, transmission processing of an RLC layer such as RLC (Radio Link Control) retransmission control, and MAC (Medium Access) Control) The transmission / reception unit performs retransmission control (for example, HARQ transmission processing), scheduling, transmission format selection, channel coding, inverse fast Fourier transform (IFFT) processing, precoding processing, and so on. 103. The downlink control signal is also subjected to transmission processing such as channel coding and inverse fast Fourier transform, and transferred to the transmission / reception unit 103.

(4) The transmission / reception section 103 converts the baseband signal precoded and output from the baseband signal processing section 104 for each antenna into a radio frequency band, and transmits the radio frequency band. The radio frequency signal frequency-converted by the transmitting / receiving section 103 is amplified by the amplifier section 102 and transmitted from the transmitting / receiving antenna 101. The transmission / reception unit 103 can be configured from a transmitter / receiver, a transmission / reception circuit, or a transmission / reception device described based on common recognition in the technical field according to the present disclosure. Note that the transmission / reception unit 103 may be configured as an integrated transmission / reception unit, or may be configured from a transmission unit and a reception unit.

On the other hand, as for an uplink signal, a radio frequency signal received by the transmission / reception antenna 101 is amplified by the amplifier unit 102. The transmitting / receiving section 103 receives the upstream signal amplified by the amplifier section 102. Transmitting / receiving section 103 frequency-converts the received signal into a baseband signal and outputs the baseband signal to baseband signal processing section 104.

In the baseband signal processing unit 104, fast Fourier transform (FFT: Fast Fourier Transform) processing, inverse discrete Fourier transform (IDFT: Inverse Discrete Fourier Transform) processing, and error correction are performed on user data included in the input uplink signal. Decoding, reception processing of MAC retransmission control, reception processing of the RLC layer and PDCP layer are performed, and the data is transferred to the upper station apparatus 30 via the transmission path interface 106. The call processing unit 105 performs call processing (setting, release, etc.) of a communication channel, state management of the base station 10, management of radio resources, and the like.

The transmission path interface 106 transmits and receives signals to and from the higher-level station device 30 via a predetermined interface. The transmission line interface 106 transmits and receives signals (backhaul signaling) to and from another base station 10 via an interface between base stations (for example, an optical fiber compliant with CPRI (Common Public Radio Interface), an X2 interface). Is also good.

Note that the transmission / reception unit 103 may further include an analog beamforming unit that performs analog beamforming. The analog beamforming unit includes an analog beamforming circuit (for example, a phase shifter, a phase shift circuit) or an analog beamforming device (for example, a phase shifter) described based on common recognition in the technical field according to the present invention. May be. Further, the transmitting / receiving antenna 101 may be configured by, for example, an array antenna.

FIG. 5 is a diagram illustrating an example of a functional configuration of the base station according to an embodiment of the present disclosure. Note that, in this example, functional blocks of characteristic portions in the present embodiment are mainly shown, and it may be assumed that the base station 10 also has other functional blocks necessary for wireless communication.

The baseband signal processing unit 104 includes at least a control unit (scheduler) 301, a transmission signal generation unit 302, a mapping unit 303, a reception signal processing unit 304, and a measurement unit 305. Note that these configurations need only be included in base station 10, and some or all of the configurations need not be included in baseband signal processing section 104.

The control unit (scheduler) 301 controls the entire base station 10. The control unit 301 can be configured from a controller, a control circuit, or a control device described based on common recognition in the technical field according to the present disclosure.

The control unit 301 controls, for example, signal generation in the transmission signal generation unit 302, signal assignment in the mapping unit 303, and the like. Further, the control unit 301 controls a signal reception process in the reception signal processing unit 304, a signal measurement in the measurement unit 305, and the like.

The control unit 301 performs scheduling (for example, resources) of system information, a downlink data signal (for example, a signal transmitted on the PDSCH), and a downlink control signal (for example, a signal transmitted on the PDCCH and / or the EPDCCH; acknowledgment information and the like). Allocation). Further, control section 301 controls generation of a downlink control signal, a downlink data signal, and the like based on a result of determining whether or not retransmission control is required for an uplink data signal.

The control unit 301 controls scheduling of a synchronization signal (for example, Primary Synchronization Signal (PSS) / Secondary Synchronization Signal (SSS)) and a downlink reference signal (for example, CRS, CSI-RS, DMRS).

The control unit 301 includes an uplink data signal (for example, a signal transmitted on PUSCH), an uplink control signal (for example, a signal transmitted on PUCCH and / or PUSCH, acknowledgment information, etc.), a random access preamble (for example, PRACH). (Transmission signal), scheduling of uplink reference signals and the like.

The control unit 301 controls to form a transmission beam and / or a reception beam using digital BF (for example, precoding) in the baseband signal processing unit 104 and / or analog BF (for example, phase rotation) in the transmission and reception unit 103. May be performed. The control unit 301 may perform control to form a beam based on downlink channel information, uplink channel information, and the like. These propagation path information may be acquired from the reception signal processing unit 304 and / or the measurement unit 305.

Transmission signal generation section 302 generates a downlink signal (downlink control signal, downlink data signal, downlink reference signal, etc.) based on an instruction from control section 301, and outputs the generated downlink signal to mapping section 303. The transmission signal generation unit 302 can be configured from a signal generator, a signal generation circuit, or a signal generation device described based on common recognition in the technical field according to the present disclosure.

The transmission signal generation unit 302 generates a DL assignment for notifying downlink data allocation information and / or a UL grant for notifying uplink data allocation information, based on an instruction from the control unit 301, for example. The DL assignment and the UL grant are both DCI and follow the DCI format. In addition, the downlink data signal is subjected to an encoding process and a modulation process according to an encoding rate, a modulation scheme, and the like determined based on channel state information (CSI: Channel \ State \ Information) from each user terminal 20 and the like.

Mapping section 303 maps the downlink signal generated by transmission signal generating section 302 to a predetermined radio resource based on an instruction from control section 301, and outputs it to transmitting / receiving section 103. The mapping unit 303 can be configured from a mapper, a mapping circuit, or a mapping device described based on common recognition in the technical field according to the present disclosure.

(4) The reception signal processing unit 304 performs reception processing (for example, demapping, demodulation, decoding, and the like) on the reception signal input from the transmission / reception unit 103. Here, the received signal is, for example, an uplink signal (uplink control signal, uplink data signal, uplink reference signal, etc.) transmitted from the user terminal 20. The reception signal processing unit 304 can be configured from a signal processor, a signal processing circuit, or a signal processing device described based on common recognition in the technical field according to the present disclosure.

(4) The reception signal processing unit 304 outputs the information decoded by the reception processing to the control unit 301. For example, when a PUCCH including HARQ-ACK is received, HARQ-ACK is output to control section 301. Further, the reception signal processing unit 304 outputs the reception signal and / or the signal after the reception processing to the measurement unit 305.

(4) The measurement unit 305 performs measurement on the received signal. The measurement unit 305 can be configured from a measurement device, a measurement circuit, or a measurement device described based on common recognition in the technical field according to the present disclosure.

For example, the measurement unit 305 may perform RRM (Radio Resource Management) measurement, CSI (Channel State Information) measurement, or the like based on the received signal. The measurement unit 305 is configured to receive power (for example, RSRP (Reference Signal Received Power)), reception quality (for example, RSRQ (Reference Signal Received Quality), SINR (Signal to Interference plus Noise Ratio, SNR (Signal to Noise Ratio)). , Signal strength (for example, RSSI (Received @ Signal @ Strength @ Indicator)), channel information (for example, CSI), and the like. The measurement result may be output to the control unit 301.

The transmitting and receiving unit 103 may transmit a wake-up signal (WUS: Wake-Up-Signal), a sleep signal (GTS: Go-To-sleep @ Signal), or the like to the user terminal 20. The transmission / reception unit 103 may transmit setting information related to search space setting (for example, SearchSpace information element), setting information related to CORRESET (for example, ControlResourceSet information element), and the like.

(User terminal)
FIG. 6 is a diagram illustrating an example of the entire configuration of the user terminal according to the embodiment. The user terminal 20 includes a plurality of transmitting / receiving antennas 201, an amplifier unit 202, a transmitting / receiving unit 203, a baseband signal processing unit 204, and an application unit 205. Note that the transmitting / receiving antenna 201, the amplifier unit 202, and the transmitting / receiving unit 203 may be configured to include at least one each.

(4) The radio frequency signal received by the transmitting / receiving antenna 201 is amplified by the amplifier unit 202. The transmission / reception unit 203 receives the downlink signal amplified by the amplifier unit 202. The transmission / reception section 203 converts the frequency of the received signal into a baseband signal, and outputs the baseband signal to the baseband signal processing section 204. The transmission / reception unit 203 can be configured from a transmitter / receiver, a transmission / reception circuit, or a transmission / reception device described based on common recognition in the technical field according to the present disclosure. Note that the transmission / reception unit 203 may be configured as an integrated transmission / reception unit, or may be configured from a transmission unit and a reception unit.

The baseband signal processing unit 204 performs FFT processing, error correction decoding, reception processing for retransmission control, and the like on the input baseband signal. The downlink user data is transferred to the application unit 205. The application unit 205 performs processing related to layers higher than the physical layer and the MAC layer. Also, of the downlink data, broadcast information may be transferred to the application unit 205.

On the other hand, uplink user data is input from the application unit 205 to the baseband signal processing unit 204. The baseband signal processing unit 204 performs retransmission control transmission processing (eg, HARQ transmission processing), channel coding, precoding, discrete Fourier transform (DFT) processing, IFFT processing, and the like, and performs transmission / reception processing. Transferred to 203.

(4) The transmission / reception unit 203 converts the baseband signal output from the baseband signal processing unit 204 into a radio frequency band and transmits the radio frequency band. The radio frequency signal frequency-converted by the transmitting / receiving section 203 is amplified by the amplifier section 202 and transmitted from the transmitting / receiving antenna 201.

Note that the transmission / reception unit 203 may further include an analog beamforming unit that performs analog beamforming. The analog beamforming unit includes an analog beamforming circuit (for example, a phase shifter, a phase shift circuit) or an analog beamforming device (for example, a phase shifter) described based on common recognition in the technical field according to the present invention. May be. Further, the transmitting / receiving antenna 201 may be configured by, for example, an array antenna.

FIG. 7 is a diagram illustrating an example of a functional configuration of the user terminal according to the embodiment. Note that, in this example, functional blocks of characteristic portions in the present embodiment are mainly shown, and it may be assumed that the user terminal 20 also has other functional blocks necessary for wireless communication.

The baseband signal processing unit 204 of the user terminal 20 includes at least a control unit 401, a transmission signal generation unit 402, a mapping unit 403, a reception signal processing unit 404, and a measurement unit 405. Note that these configurations need only be included in the user terminal 20, and some or all of the configurations need not be included in the baseband signal processing unit 204.

The control unit 401 controls the entire user terminal 20. The control unit 401 can be configured by a controller, a control circuit, or a control device described based on common recognition in the technical field according to the present disclosure.

The control unit 401 controls, for example, signal generation in the transmission signal generation unit 402, signal assignment in the mapping unit 403, and the like. Further, the control unit 401 controls signal reception processing in the reception signal processing unit 404, signal measurement in the measurement unit 405, and the like.

The control unit 401 acquires the downlink control signal and the downlink data signal transmitted from the base station 10 from the reception signal processing unit 404. The control unit 401 controls generation of an uplink control signal and / or an uplink data signal based on a result of determining whether or not retransmission control is required for a downlink control signal and / or a downlink data signal.

The control unit 401 controls to form a transmission beam and / or a reception beam using digital BF (for example, precoding) in the baseband signal processing unit 204 and / or analog BF (for example, phase rotation) in the transmission / reception unit 203. May be performed. The control unit 401 may perform control to form a beam based on downlink channel information, uplink channel information, and the like. These propagation path information may be obtained from the reception signal processing unit 404 and / or the measurement unit 405.

When the control unit 401 acquires various information notified from the base station 10 from the reception signal processing unit 404, the control unit 401 may update parameters used for control based on the information.

Transmission signal generating section 402 generates an uplink signal (uplink control signal, uplink data signal, uplink reference signal, etc.) based on an instruction from control section 401 and outputs the generated signal to mapping section 403. The transmission signal generation unit 402 can be configured from a signal generator, a signal generation circuit, or a signal generation device described based on common recognition in the technical field according to the present disclosure.

(4) The transmission signal generation unit 402 generates an uplink control signal related to acknowledgment information, channel state information (CSI), and the like, based on an instruction from the control unit 401, for example. Further, transmission signal generating section 402 generates an uplink data signal based on an instruction from control section 401. For example, the transmission signal generation unit 402 is instructed by the control unit 401 to generate an uplink data signal when the downlink control signal notified from the base station 10 includes a UL grant.

Mapping section 403 maps the uplink signal generated by transmission signal generation section 402 to a radio resource based on an instruction from control section 401, and outputs the result to transmission / reception section 203. The mapping unit 403 can be configured from a mapper, a mapping circuit, or a mapping device described based on common recognition in the technical field according to the present disclosure.

(4) The reception signal processing unit 404 performs reception processing (for example, demapping, demodulation, and decoding) on the reception signal input from the transmission / reception unit 203. Here, the received signal is, for example, a downlink signal (a downlink control signal, a downlink data signal, a downlink reference signal, etc.) transmitted from the base station 10. The reception signal processing unit 404 can be configured from a signal processor, a signal processing circuit, or a signal processing device described based on common recognition in the technical field according to the present disclosure. In addition, the reception signal processing unit 404 can configure a reception unit according to the present disclosure.

(4) The reception signal processing unit 404 outputs the information decoded by the reception processing to the control unit 401. The reception signal processing unit 404 outputs, for example, broadcast information, system information, RRC signaling, DCI, and the like to the control unit 401. Further, the reception signal processing unit 404 outputs the reception signal and / or the signal after the reception processing to the measurement unit 405.

The measurement unit 405 performs measurement on the received signal. For example, the measurement unit 405 may perform the same frequency measurement and / or the different frequency measurement on one or both of the first carrier and the second carrier. When the serving cell is included in the first carrier, measurement section 405 may perform the different frequency measurement on the second carrier based on the measurement instruction acquired from reception signal processing section 404. The measurement unit 405 can be configured from a measurement device, a measurement circuit, or a measurement device described based on common recognition in the technical field according to the present disclosure.

For example, the measurement unit 405 may perform RRM measurement, CSI measurement, and the like based on the received signal. The measurement unit 405 may measure reception power (for example, RSRP), reception quality (for example, RSRQ, SINR, SNR), signal strength (for example, RSSI), channel information (for example, CSI), and the like. The measurement result may be output to the control unit 401.

The transmitting and receiving unit 203 may receive a wake-up signal (WUS: Wake-Up-Signal), a sleep signal (GTS: Go-To-sleep @ Signal), or the like. The transmission / reception unit 203 may receive, from the base station 10, setting information (for example, a SearchSpace information element) related to search space setting, setting information (for example, a ControlResourceSet information element) related to CORRESET.

The control unit 401 controls a transition from a non-low power consumption operation mode (for example, a non-DRX mode, a network access mode, etc.) to a low power consumption operation mode (for example, a DRX mode, a power saving mode, etc.) based on the GTS. May be.

When DRX (Discontinuous Reception) is set, the control unit 401 may perform control for monitoring the GTS during the ON period of the DRX.

In the ON period, the control unit 401 may perform control of not monitoring or monitoring a specific PDCCH candidate among PDCCH (Physical Downlink Control Channel) candidates included in the set search space set.

The control unit 401 may perform control to monitor the GTS at a cycle independent of the cycle of DRX (Discontinuous Reception).

If the control unit 401 detects a GTS a predetermined number of times or more in a certain period, the control unit 401 may perform a transition to an inactive or idle state.

GTS may be a sequence-based signal or a message-based signal. The GTS may be a signal that is not a MAC control element (DRX \ MAC \ CE: DRX \ command \ MAC \ control \ Element).

(Hardware configuration)
Note that the block diagram used in the description of the above-described embodiment shows blocks in functional units. These functional blocks (components) are realized by an arbitrary combination of at least one of hardware and software. In addition, a method for implementing each functional block is not particularly limited. That is, each functional block may be realized using one device physically or logically coupled, or directly or indirectly (for example, two or more devices physically or logically separated from each other). , Wired, wireless, etc.) and using these multiple devices. The functional block may be realized by combining one device or the plurality of devices with software.

Here, the functions include judgment, decision, judgment, calculation, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, and deemed. , Broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc. Not limited. For example, a functional block (constituent unit) that makes transmission function may be referred to as a transmitting unit (transmitting unit / section), a transmitter (transmitter), or the like. In any case, as described above, the realization method is not particularly limited.

For example, a base station, a user terminal, and the like according to an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method according to the present disclosure. FIG. 8 is a diagram illustrating an example of a hardware configuration of the base station and the user terminal according to the embodiment. The above-described base station 10 and user terminal 20 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like. .

In the following description, the term “apparatus” can be read as a circuit, a device, a unit, or the like. The hardware configuration of the base station 10 and the user terminal 20 may be configured to include one or more of the devices illustrated in the drawing, or may be configured to exclude some of the devices.

For example, although only one processor 1001 is illustrated, there may be multiple processors. Further, the processing may be executed by one processor, or the processing may be executed by two or more processors simultaneously, sequentially, or by using another method. Note that the processor 1001 may be implemented by one or more chips.

The functions of the base station 10 and the user terminal 20 are performed, for example, by reading predetermined software (program) on hardware such as the processor 1001 and the memory 1002 so that the processor 1001 performs an operation and communicates via the communication device 1004. And controlling at least one of reading and writing of data in the memory 1002 and the storage 1003.

The processor 1001 controls the entire computer by operating an operating system, for example. 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 device, a register, and the like. For example, the above-described baseband signal processing unit 104 (204), call processing unit 105, and the like may be realized by the processor 1001.

The processor 1001 reads out a program (program code), a software module, data, and the like from at least one of the storage 1003 and the communication device 1004 to the memory 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 operation described in the above embodiment is used. For example, the control unit 401 of the user terminal 20 may be implemented by a control program stored in the memory 1002 and operated by the processor 1001, and other functional blocks may be similarly implemented.

The memory 1002 is a computer-readable recording medium, for example, at least one of ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically EPROM), RAM (Random Access Memory), and other appropriate storage media. It may be constituted by one. The memory 1002 may be called a register, a cache, a main memory (main storage device), or the like. The memory 1002 can store a program (program code), a software module, and the like that can be executed to implement the wireless communication method according to an embodiment of the present disclosure.

The storage 1003 is a computer-readable recording medium such as a flexible disk, a floppy (registered trademark) disk, a magneto-optical disk (for example, a compact disk (CD-ROM (Compact Disc) ROM, etc.)), a digital versatile disc, At least one of a Blu-ray (registered trademark) disk, a removable disk, a hard disk drive, a smart card, a flash memory device (eg, a card, a stick, a key drive), a magnetic stripe, a database, a server, and other suitable storage media. May be configured. The storage 1003 may be called an auxiliary storage device.

The communication device 1004 is hardware (transmission / reception device) for performing communication 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). May be configured. For example, the transmission / reception antenna 101 (201), the amplifier unit 102 (202), the transmission / reception unit 103 (203), the transmission line interface 106, and the like may be realized by the communication device 1004. The transmission / reception unit 103 may be physically or logically separated by the transmission unit 103a and the reception unit 103b.

The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, and the like) that receives an external input. The output device 1006 is an output device that performs output to the outside (for example, a display, a speaker, an LED (Light Emitting Diode) lamp, and the like). Note that the input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).

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

In addition, the base station 10 and the user terminal 20 include hardware such as a microprocessor, a digital signal processor (DSP), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), and an FPGA (Field Programmable Gate Array). It may be configured to include hardware, and some or all of the functional blocks may be realized using the hardware. For example, the processor 1001 may be implemented using at least one of these hardware.

(Modification)
Note that terms described in the present disclosure and terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meaning. For example, at least one of the channel and the symbol may be a signal (signaling). Also, the signal may be a message. The reference signal may be abbreviated as RS (Reference Signal), and may be referred to as a pilot, a pilot signal, or the like according to an applied standard. A component carrier (CC: Component Carrier) may be called a cell, a frequency carrier, a carrier frequency, or the like.

The radio frame may be configured by one or a plurality of periods (frames) in the time domain. The one or more respective periods (frames) forming the radio frame may be referred to as a subframe. Furthermore, a subframe may be configured by one or more slots in the time domain. The subframe may be of a fixed length of time (eg, 1 ms) that does not depend on numerology.

Here, the new melology may be a communication parameter applied to at least one of transmission and reception of a certain 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, radio frame configuration, transmission and reception. At least one of a specific filtering process performed by the transceiver in the frequency domain and a specific windowing process performed by the transceiver in the time domain may be indicated.

The slot may be configured by one or more symbols (OFDM (Orthogonal Frequency Division Multiplexing) symbol, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbol, etc.) in the time domain. Further, the slot may be a time unit based on numerology.

The slot may include a plurality of mini slots. Each minislot may be constituted by one or more symbols in the time domain. Also, minislots may be called subslots. A minislot may be made up of a smaller number of symbols than slots. A PDSCH (or PUSCH) transmitted in time units larger than minislots may be referred to as PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using minislots may be referred to as PDSCH (PUSCH) mapping type B.

Radio frames, subframes, slots, minislots, and symbols all represent time units when transmitting signals. The radio frame, the subframe, the slot, the minislot, and the symbol may have different names corresponding thereto. Note that time units such as frames, subframes, slots, minislots, and symbols in the present disclosure may be interchanged with each other.

For example, one subframe may be called a transmission time interval (TTI: Transmission @ Time @ Interval), a plurality of consecutive subframes may be called a TTI, and one slot or one minislot is called a TTI. May be. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in the existing LTE, a period shorter than 1 ms (for example, 1 to 13 symbols), or a period longer than 1 ms. It may be. Note that the unit representing the TTI may be called a slot, a minislot, or the like instead of a subframe.

Here, TTI means, for example, a minimum time unit of scheduling in wireless communication. For example, in the LTE system, the base station performs scheduling for allocating radio resources (frequency bandwidth, transmission power, and the like that can be used in each user terminal) to each user terminal in TTI units. Note that the definition of TTI is not limited to this.

The TTI may be a transmission time unit such as a channel-encoded data packet (transport block), a code block, a code word, or a processing unit such as scheduling and link adaptation. Note that when a TTI is given, a time section (for example, the number of symbols) in which a transport block, a code block, a codeword, and the like are actually mapped may be shorter than the TTI.

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

A TTI having a time length of 1 ms may be called 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, and the like. A TTI shorter than the normal TTI may be called 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, and the like.

Note that a long TTI (for example, a normal TTI, a subframe, etc.) may be read as a TTI having a time length exceeding 1 ms, and a short TTI (for example, a shortened TTI, etc.) may be replaced with a TTI shorter than the long TTI and 1 ms. The TTI having the TTI length described above may be replaced with the TTI.

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

Ｒ Also, the RB may include one or more symbols in the time domain, and may have a length of one slot, one minislot, one subframe, or one TTI. One TTI, one subframe, and the like may each be configured by one or a plurality of resource blocks.

Note that one or a plurality of RBs include a physical resource block (PRB: Physical @ RB), a subcarrier 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.

{Also, a resource block may be composed of one or more resource elements (RE: Resource @ Element). For example, one RE may be a radio resource area of one subcarrier and one symbol.

A bandwidth part (BWP: Bandwidth @ Part) (which may also be referred to as a partial bandwidth or the like) may represent a subset of contiguous common RBs (common @ resource @ blocks) for a certain numerology in a certain carrier. Good. Here, the common RB may be specified by an index of the RB based on the common reference point of the carrier. A PRB may be defined in a BWP and numbered within the BWP.

$ BWP may include a BWP for UL (UL @ BWP) and a BWP for DL (DL @ BWP). For a UE, one or more BWPs may be configured in one carrier.

少 な く と も At least one of the configured BWPs may be active, and the UE may not have to assume transmitting and receiving a given signal / channel outside the active BWP. Note that “cell”, “carrier”, and the like in the present disclosure may be replaced with “BWP”.

The structures of the above-described radio frame, subframe, slot, minislot, and symbol are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, included in an RB The number of subcarriers, the number of symbols in a TTI, the symbol length, the configuration such as the cyclic prefix (CP) length can be variously changed.

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

名称 Names used for parameters and the like in the present disclosure are not limited in any way. Further, the formulas and the like using these parameters may be different from those explicitly disclosed in the present disclosure. The various channels (PUCCH (Physical Uplink Control Channel), PDCCH (Physical Downlink Control Channel), etc.) and information elements can be identified by any suitable name, so the various names assigned to these various channels and information elements Is not a limiting name in any way.

The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc., that can be referred to throughout the above description are not limited to voltages, currents, electromagnetic waves, magnetic or magnetic particles, optical or photons, or any of these. May be represented by a combination of

情報 In addition, information, signals, etc. can be output from the upper layer to at least one of the lower layer and the lower layer to the upper layer. Information, signals, and the like may be input and output via a plurality of network nodes.

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

Notification of information is not limited to the aspect / embodiment described in the present disclosure, and may be performed using another method. For example, the information is notified by physical layer signaling (for example, downlink control information (DCI: Downlink Control Information), uplink control information (UCI: Uplink Control Information)), upper layer signaling (for example, RRC (Radio Resource Control) signaling, It may be implemented by broadcast information (master information block (MIB: Master Information Block), system information block (SIB: System Information Block), etc.), MAC (Medium Access Control) signaling), other signals, or a combination thereof.

{Note that the physical layer signaling may be called L1 / L2 (Layer 1 / Layer 2) control information (L1 / L2 control signal), L1 control information (L1 control signal), or the like. The RRC signaling may be called an RRC message, and may be, for example, an RRC connection setup (RRCConnectionSetup) message, an RRC connection reconfiguration (RRCConnectionReconfiguration) message, or the like. Also, the MAC signaling may be notified using, for example, a MAC control element (MAC @ CE (Control @ Element)).

In addition, the notification of the predetermined information (for example, the notification of “X”) is not limited to an explicit notification, and is implicit (for example, by not performing the notification of the predetermined information or by another information). May be performed).

The determination may be made by a value represented by 1 bit (0 or 1) or by a boolean value represented by true or false. , May be performed by comparing numerical values (for example, comparison with a predetermined value).

Software, whether called software, firmware, middleware, microcode, hardware description language, or any other name, instructions, instruction sets, codes, code segments, program codes, programs, subprograms, software modules , Applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, and the like.

ソ フ ト ウ ェ ア In addition, software, instructions, information, and the like may be transmitted and received via a transmission medium. For example, if the software uses at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.) and wireless technology (infrared, microwave, etc.), the website, When transmitted from a server or other remote source, at least one of these wired and / or wireless technologies is included within the definition of a transmission medium.

用語 As used in this disclosure, the terms “system” and “network” may be used interchangeably.

In the present disclosure, “precoding”, “precoder”, “weight (precoding weight)”, “pseudo collocation (QCL: Quasi-Co-Location)”, “transmission power”, “phase rotation”, “antenna port” , "Antenna port group", "layer", "number of layers", "rank", "beam", "beam width", "beam angle", "antenna", "antenna element", "panel", etc. The terms may be used interchangeably.

In the present disclosure, “base station (BS: Base @ Station)”, “wireless base station”, “fixed station (fixed @ station)”, “NodeB”, “eNodeB (eNB)”, “gNodeB (gNB)”, “ "Access point (access @ point)", "transmission point (TP: Transmission @ Point)", "reception point (RP: Reception @ Point)", "transmission / reception point (TRP: Transmission / Reception @ Point)", "panel", "cell" Terms such as, "sector", "cell group", "carrier", "component carrier" may be used interchangeably. A base station may be referred to by a term such as a macro cell, a small cell, a femto cell, a pico cell, and the like.

A base station can accommodate one or more (eg, three) cells. If the base station accommodates multiple cells, the entire coverage area of the base station can be partitioned 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 通信 Head)). The term "cell" or "sector" refers to part or all of the coverage area of at least one of a base station and a base station subsystem that provides communication services in this coverage.

In the present disclosure, terms such as “mobile station (MS)”, “user terminal”, “user equipment” (UE), and “terminal” may be used interchangeably. .

A mobile station is a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal. , A handset, a user agent, a mobile client, a client or some other suitable terminology.

少 な く と も 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. Note that at least one of the base station and the mobile station may be a device mounted on the mobile unit, the mobile unit itself, or the like. The moving object may be a vehicle (for example, a car, an airplane, etc.), an unmanned moving object (for example, a drone, a self-driving car, etc.), or a robot (maned or unmanned). ). Note that at least one of the base station and the mobile station includes a device that does not necessarily move during a communication operation. For example, at least one of the base station and the mobile station may be an IoT (Internet of Things) device such as a sensor.

基地 In addition, the base station in the present disclosure may be replaced with a user terminal. For example, communication between a base station and a user terminal is replaced with communication between a plurality of user terminals (for example, it may be called D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.). As for the configuration, each aspect / embodiment of the present disclosure may be applied. In this case, the configuration may be such that the user terminal 20 has the function 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, an uplink channel, a downlink channel, and the like may be replaced with a side channel.

Similarly, the user terminal in the present disclosure may be replaced with a base station. In this case, the base station 10 may have the function of the user terminal 20 described above.

In the present disclosure, an operation performed by the base station may be performed by an upper node (upper node) in some cases. In a network including one or more network nodes having a base station (network @ nodes), various operations performed for communication with a terminal include a base station, one or more network nodes other than the base station (eg, Obviously, it can be performed by MME (Mobility @ Management @ Entity), S-GW (Serving-Gateway), etc., but not limited thereto, or a combination thereof.

各 Each aspect / embodiment described in the present disclosure may be used alone, may be used in combination, or may be switched and used in execution. In addition, the order of the processing procedure, sequence, flowchart, and the like of each aspect / embodiment described in the present disclosure may be changed as long as there is no inconsistency. For example, for the methods described in this disclosure, elements of the various steps are presented in an exemplary order, and are not limited to the specific order presented.

Each aspect / embodiment described in the present disclosure is applicable to LTE (Long Term Evolution), LTE-A (LTE-Advanced), LTE-B (LTE-Beyond), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication). system), 5G (5th generation mobile communication system), FRA (Future Radio Access), New-RAT (Radio Access Technology), NR (New Radio), NX (New radio access), FX (Future generation radio access), GSM (Registered trademark) (Global System for Mobile Communications), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802. 20, UWB (Ultra-WideBand), Bluetooth (registered trademark) , A system using other appropriate wireless communication methods, a next-generation system extended based on these systems, and the like. A plurality of systems may be combined (for example, a combination of LTE or LTE-A and 5G) and applied.

記載 The term "based on" as used in the present disclosure does not mean "based solely on" unless stated otherwise. In other words, the description "based on" means both "based only on" and "based at least on."

い か な る Any reference to elements using designations such as "first," "second," etc., as used in this disclosure, does not generally limit the quantity or order of those elements. These designations may be used in the present disclosure as a convenient way to distinguish between two or more elements. Thus, reference to a first and second element does not mean that only two elements can be employed or that the first element must precede the second element in some way.

用語 The term "determining" as used in this disclosure may encompass a wide variety of actions. For example, "judgment (determination)" means judging, calculating, computing, processing, deriving, investigating, searching (up, search, inquiry) ( For example, a search in a table, database, or another data structure), ascertaining, etc., may be regarded as "deciding".

In addition, “determination” includes receiving (eg, receiving information), transmitting (eg, transmitting information), input (input), output (output), and access ( accessing) (e.g., accessing data in a memory) or the like.

Also, “judgment (decision)” is regarded as “judgment (decision)” of resolving, selecting, selecting, establishing, comparing, and the like. Is also good. That is, “judgment (decision)” may be regarded as “judgment (decision)” of any operation.

判断 Also, “judgment (decision)” may be read as “assuming”, “expecting”, “considering”, or the like.

As used in this disclosure, the terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements. And may include the presence of one or more intermediate elements between two elements "connected" or "coupled" to each other. The coupling or connection between the elements may be physical, logical, or a combination thereof. For example, “connection” may be read as “access”.

In the present disclosure, where two elements are connected, using one or more wires, cables, printed electrical connections, etc., and as some non-limiting and non-exhaustive examples, the radio frequency domain, microwave It can be considered to be "connected" or "coupled" to each other using electromagnetic energy having a wavelength in the region, the light (both visible and invisible) regions, and the like.

に お い て In the present disclosure, the term “A and B are different” may mean that “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 "coupled" may be construed similarly to "different."

Where the terms “include”, “including” and variations thereof are used in the present disclosure, these terms are as inclusive as the term “comprising” It is intended. Further, the term "or" as used in the present disclosure is not intended to be an exclusive or.

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

Although the invention according to the present disclosure has been described in detail above, it is obvious to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The invention according to the present disclosure can be embodied as modifications and changes without departing from the spirit and scope of the invention determined based on the description in the claims. Therefore, the description of the present disclosure is intended to be illustrative and does not bring any restrictive meaning to the invention according to the present disclosure.

Claims (6)

1. A receiving unit that receives a sleep signal (GTS: Go-To-sleep Signal);
   A control unit that controls a transition from the non-low power consumption operation mode to the low power consumption operation mode based on the GTS.
2. The user terminal according to claim 1, wherein, when DRX (Discontinuous Reception) is set, the control unit performs control for monitoring the GTS during an ON period of the DRX.
3. 3. The control unit according to claim 2, wherein the control unit performs control not monitoring a specific PDCCH candidate among PDCCH (Physical Downlink Control Channel) candidates included in the set search space set during the ON period. 4. User terminal.
4. 2. The user terminal according to claim 1, wherein the control unit performs control for monitoring the GTS at a period independent of a DRX (Discontinuous Reception) period. 3.
5. The user according to any one of claims 1 to 4, wherein, when the control unit detects the GTS a predetermined number of times or more in a certain period, the control unit performs a transition to an inactive or idle state. Terminal.
6. Receiving a sleep signal (GTS: Go-To-sleep Signal);
   Controlling a transition from a non-low power consumption operation mode to a low power consumption operation mode based on the GTS.

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