WO2014156826A1

WO2014156826A1 - Wireless communication system, terminal apparatus, base station apparatus, wireless communication method and integrated circuit

Info

Publication number: WO2014156826A1
Application number: PCT/JP2014/057312
Authority: WO
Inventors: 秀和坪井; 克成上村
Original assignee: シャープ株式会社
Priority date: 2013-03-29
Filing date: 2014-03-18
Publication date: 2014-10-02
Also published as: JP2016115948A

Abstract

A base station apparatus informs, to a terminal apparatus, a measurement setting message including information of a cell (gray cell) for which the terminal apparatus is not to perform any measurement and/or any report when a predetermined condition is satisfied. The terminal apparatus then informs a measurement report message to the base station apparatus. If the measurement report message is a report related to the gray cell, the terminal apparatus extends a short-interval intermittent reception period in which the terminal apparatus transitions to a long-interval intermittent reception state informed in advance.

Description

Wireless communication system, terminal device, base station device, wireless communication method, and integrated circuit

The present invention relates to a radio communication system, a terminal device, a base station device, a radio communication method, and an integrated circuit, and more specifically, a radio communication system in which macro cells and small cells are arranged, and a terminal in the radio communication system The present invention relates to a device, a base station device, a wireless communication method, and an integrated circuit.
This application claims priority based on Japanese Patent Application No. 2013-074022 filed in Japan on March 29, 2013, the contents of which are incorporated herein by reference.

In 3GPP (3rd Generation Partnership Project), the W-CDMA system has been standardized as a third generation cellular mobile communication system, and services have been started sequentially. Also, HSDPA with higher communication speed has been standardized and is being serviced.

On the other hand, in 3GPP, standardization of the evolution of third generation wireless access (Evolved Universal Terrestrial Radio Access; hereinafter referred to as “EUTRA”) has also been carried out, and the service has started. As an EUTRA downlink communication method, an OFDM (Orthogonal Frequency Division Division Multiplexing) method that is resistant to multipath interference and suitable for high-speed transmission is employed. In addition, as an uplink communication method, considering the cost and power consumption of a terminal device, a single carrier frequency division multiplexing SC-FDMA (Single-Channel Frequency Division Multiplexing) method that can reduce the peak-to-average power ratio PAPR (Peak to Average Power to Ratio) of a transmission signal Carrier-Frequency-Division-Multiple-Access) DFT (Discrete-Fourier-Transform) -spread OFDM scheme is adopted.

In 3GPP, standardization of Advanced-EUTRA, which is a further evolution of EUTRA, is also being carried out. In Advanced-EUTRA, it is assumed that communication at a maximum transmission rate of 1 Gbps or more and uplink 500 Mbps or more is performed using a band up to a maximum of 100 MHz bandwidth in uplink and downlink.

In Advanced-EUTRA, in order to efficiently support locally generated communication traffic, a heterogeneous network (hereinafter referred to as HetNet) is being studied. HetNet is a hierarchical network in which small cells such as picocells and femtocells are arranged so that macrocells and cell areas overlap (with the same frequency or different frequencies) in addition to conventional macrocells. It is possible to distribute communication traffic by moving communication of terminal devices in the vicinity of the small cell to the small cell. Therefore, 3GPP is studying a mechanism by which a terminal device located in a macro cell can efficiently detect a small cell (Non-patent Document 1).

Currently, EUTRA and Advanced-EUTRA have a mechanism for reducing power consumption by discontinuous reception (Discontinuous （Reception; DRX). However, this reception interval becomes longer, which delays communication with the base station device. Non-Patent Document 1 and Non-Patent Document 2 show that the probability of handover failure increases in a HetNet environment. In Non-Patent Document 2, in a situation where a handover occurs, that is, in a situation where a terminal device detects a neighboring cell that satisfies a condition set by the base station device and reports it to the base station device, a long interval intermittent reception (Long It has been proposed to wait for a handover instruction without transitioning to the (DRX) state for a certain period of time. However, the proposal of Non-Patent Document 2 has a problem that power consumption increases even in a non-HetNet environment.

One embodiment of the present invention has been made in view of the above points, and an object thereof is to provide a wireless communication system, a terminal device, a base station device, a wireless communication method, and an integrated circuit that efficiently control intermittent reception. It is to be.

(1) In order to achieve the above object, one aspect of the present invention takes the following measures. That is, the wireless communication system in the embodiment of the present invention is a wireless communication system in which a base station device and a terminal device communicate with each other, and the base station device performs measurement and measurement when the terminal device satisfies a predetermined condition. / Or notifies the terminal device of a measurement setting message including information on a cell (GrayCell) that does not report, the terminal device performs a measurement based on the measurement setting message, and sends a measurement report message to the base station device The wireless communication system includes means for extending a short interval intermittent reception period until the transition to the long interval intermittent reception state notified in advance when the measurement report message is a report regarding the GrayCell.

(2) Moreover, the terminal device in the embodiment of the present invention is a terminal device that communicates with a base station device, and performs measurement and / or reporting from the base station device when the terminal device satisfies a predetermined condition. A measurement setting message including information on a cell (GrayCell) not to be received is received, a measurement result based on the measurement setting message is notified to the base station apparatus as a measurement report message, and the measurement report message is a report on the GrayCell In this case, the terminal device includes means for extending a short interval intermittent reception period until a transition to the long interval intermittent reception state notified to the terminal device in advance is made.

(3) Moreover, in the terminal device according to the embodiment of the present invention, the terminal device determines whether the measurement report message is a report related to the GrayCell when the serving cell of the terminal device is a small cell. Regardless of this, the terminal device is provided with means for extending a short interval intermittent reception period until a transition to a long interval intermittent reception state notified to the terminal device in advance is made.

(4) In addition, the base station apparatus according to the embodiment of the present invention is a base station apparatus that communicates with a terminal apparatus, and performs measurement and / or reporting to the terminal apparatus when the terminal apparatus satisfies a predetermined condition. A measurement setting message including information on a cell (GrayCell) that does not perform the measurement is transmitted, the measurement result based on the measurement setting message is received from the terminal device as a measurement report message, and the measurement report message is a report on the GrayCell In this case, the base station apparatus includes means for extending a short-interval intermittent reception period until a transition to the long-interval intermittent reception state notified to the terminal apparatus in advance.

(5) In the base station apparatus according to the embodiment of the present invention, if the serving cell of the terminal apparatus is a small cell, the base station apparatus determines whether the measurement report message is a report regarding the GrayCell. Regardless of whether it is a base station apparatus comprising means for extending a short-interval intermittent reception period until a transition to the long-interval intermittent reception state notified to the terminal apparatus in advance is made.

(6) A wireless communication method according to an embodiment of the present invention is a wireless communication method applied to a wireless communication system in which a base station device and a terminal device communicate with each other, and the base station device is connected to the terminal device. A measurement setting message including information of a cell (GrayCell) that does not perform measurement and / or reporting when a predetermined condition is satisfied, and the terminal device performs measurement based on the measurement setting message. Implementing the step of notifying the base station device of a measurement report message, and until the terminal device shifts to a discontinuous reception state of a long interval notified in advance when the measurement report message is a report related to the GrayCell This is a wireless communication method including at least a step of extending the short interval intermittent reception period.

(7) A wireless communication method according to an embodiment of the present invention is a wireless communication method applied to a terminal device that communicates with a base station device, and the terminal device satisfies a predetermined condition from the base station device. A step of receiving a measurement setting message including information on a cell (GrayCell) that does not perform measurement and / or reporting, and a step of notifying the base station apparatus of a measurement result based on the measurement setting message as a measurement report message; And, when the measurement report message is a report on the GrayCell, a wireless communication method including at least a step of extending a short interval intermittent reception period until a transition to a long interval intermittent reception state previously notified to the terminal device is made It is.

(8) A wireless communication method according to an embodiment of the present invention is a wireless communication method applied to a base station device that communicates with a terminal device, and the terminal device satisfies a predetermined condition with respect to the terminal device. A step of transmitting a measurement setting message including information on a cell (GrayCell) that does not perform measurement and / or reporting, and a step of receiving a measurement result based on the measurement setting message from the terminal device as a measurement report message; When the measurement report message is a report related to the GrayCell, the wireless communication method includes at least a step of extending a short interval intermittent reception period until the terminal device shifts to a long interval intermittent reception state previously notified to the terminal device. .

(9) Moreover, the integrated circuit in the embodiment of the present invention is an integrated circuit mounted on a terminal device that communicates with a base station device, and when the terminal device satisfies a predetermined condition from the base station device. A function of receiving a measurement setting message including information of a cell (GrayCell) that does not perform measurement and / or reporting; a function of notifying the base station apparatus of a measurement result based on the measurement setting message as a measurement report message; When the measurement report message is a report related to the GrayCell, the terminal device has a function of extending the short interval intermittent reception period until the terminal device shifts to the long interval intermittent reception state notified to the terminal device in advance. Circuit.

(10) An integrated circuit according to an embodiment of the present invention is an integrated circuit mounted on a base station device that communicates with a terminal device. When the terminal device satisfies a predetermined condition with respect to the terminal device, A function of transmitting a measurement setting message including information of a cell (GrayCell) for which measurement and / or reporting is not performed, a function of receiving a measurement result based on the measurement setting message from the terminal device as a measurement report message, and the measurement An integrated circuit that causes the base station device to exhibit a function of extending a short interval intermittent reception period until the terminal device shifts to a long interval intermittent reception state when the report message is a report relating to the GrayCell It is.

As described above, according to one aspect of the present invention, it is possible to provide a wireless communication system, a terminal device, a base station device, a wireless communication method, and an integrated circuit that efficiently control intermittent reception.

It is a block diagram which shows an example of the base station apparatus which concerns on embodiment of this invention. It is a block diagram which shows an example of the terminal device which concerns on embodiment of this invention. It is a figure which shows the user planar structure of the base station apparatus and terminal device which concern on embodiment of this invention. It is a figure which shows the control plane structure of the base station apparatus and terminal device which concern on embodiment of this invention. It is the figure which showed an example of the measurement setting in the 1st Embodiment of this invention. It is a block diagram which shows an example of the measurement part of the terminal device which concerns on embodiment of this invention. It is the flowchart which showed an example of the intermittent reception control of the terminal device 2 in the 1st Embodiment of this invention. It is the flowchart which showed an example of message transmission control of the base station apparatus 1 in the 1st Embodiment of this invention. It is the figure which showed an example of the measurement setting in the 1st Embodiment of this invention. It is the figure which showed an example of the measurement setting in the 2nd Embodiment of this invention. It is the flowchart which showed an example of the intermittent reception control of the terminal device 2 in the 2nd Embodiment of this invention. It is the flowchart which showed an example of message transmission control of the base station apparatus 1 in the 2nd Embodiment of this invention. It is the figure which showed an example of the measurement setting in the 1st Embodiment and 2nd Embodiment of this invention. It is the sequence chart which showed an example of the management procedure of the conventional RRM measurement setting. It is the figure which showed an example of the conventional RRM measurement setting. It is the figure which showed an example of the intermittent reception operation | movement which concerns on embodiment of this invention. It is the figure which showed an example of the reception operation | movement which concerns on embodiment of this invention.

DETAILED DESCRIPTION Before describing each embodiment of the present invention, a technique related to each embodiment of the present invention will be briefly described below.

[Physical channel]
The main physical channels (or physical signals) used in EUTRA and Advanced EUTRA will be described. A channel means a medium used for signal transmission, and a physical channel means a physical medium used for signal transmission. The physical channel may be added in the future in EUTRA and Advanced EUTRA, or the structure and format of the physical channel may be changed or added. However, even if changed or added, the description of each embodiment of the present invention will be provided. It does not affect.

In EUTRA and Advanced EUTRA, physical channel scheduling is managed using radio frames. One radio frame is 10 ms, and one radio frame is composed of 10 subframes. Further, one subframe is composed of two slots (that is, one slot is 0.5 ms). Also, resource blocks are used as a minimum scheduling unit in which physical channels are allocated. A resource block is defined by a constant frequency region composed of a set of a plurality of subcarriers (for example, 12 subcarriers) and a region composed of a constant transmission time interval (1 slot) on the frequency axis.

The synchronization signal (Synchronization Signals) is composed of three types of primary synchronization signals and secondary synchronization signals composed of 31 types of codes arranged alternately in the frequency domain. 504 kinds of cell identifiers (physical cell ID (Physical Cell Identity; PCI)) for identifying the base station apparatus and frame timing for radio synchronization are shown by the combination. The terminal device specifies the cell ID of the synchronization signal received by the cell search.

The physical broadcast information channel (Physical Broadcast Channel; PBCH) is transmitted for the purpose of notifying control parameters (broadcast information and system information) commonly used by terminal devices in the cell. Broadcast information that is not notified on the physical broadcast information channel is transmitted as a layer 3 message (system information) on the physical downlink shared channel after the radio resource is notified on the physical downlink control channel. As broadcast information, a cell global identifier (Cell 識別子 Global Identifier; CGI) indicating a cell-specific identifier, a tracking area identifier (Tracking Area Identifier; TAI) for managing a standby area by paging, random access setting information (such as a transmission timing timer), Common radio resource setting information and the like are notified.

Downlink reference signals are classified into multiple types according to their use. For example, a cell-specific reference signal (CRS) is a pilot signal transmitted at a predetermined power for each cell, and is downlinked periodically in the frequency domain and the time domain based on a predetermined rule. Link reference signal. The terminal device measures the reception quality for each cell by receiving the cell-specific reference signal. The terminal apparatus also uses the downlink cell specific reference signal as a reference signal for demodulating the physical downlink control channel or the physical downlink shared channel transmitted simultaneously with the cell specific reference signal. The sequence used for the cell-specific reference signal is a sequence that can be identified for each cell.

The downlink reference signal is also used for estimating downlink propagation path fluctuations. A downlink reference signal used for estimation of propagation path fluctuation is referred to as a channel state information reference signal (Channel State Information References; CSI-RS) or a CSI reference signal. Also, the downlink reference signal set individually for each terminal device is referred to as UE specific reference signals (URS) or Dedicated RS (DRS), and is used for demodulation of the physical downlink control channel or the physical downlink shared channel. It is done.

The physical downlink control channel (Physical Downlink Control Channel; PDCCH) is transmitted in several OFDM symbols from the beginning of each subframe, and the radio resource allocation information according to the scheduling of the base station device and transmission to the terminal device Used to indicate the amount of power increase / decrease adjustment. Before transmitting / receiving layer 3 messages (paging, handover command, etc.) that are downlink data and downlink control data, the terminal apparatus monitors (monitors) the physical downlink control channel addressed to itself and By receiving the physical downlink control channel, it is necessary to acquire radio resource allocation information called an uplink grant during transmission and a downlink grant (downlink assignment) during reception from the physical downlink control channel. In addition, the physical downlink control channel may be configured to be transmitted in the area of the resource block allocated individually (dedicated) from the base station apparatus to the terminal apparatus, in addition to being transmitted by the ODFM symbol described above. Is possible.

The physical uplink control channel (Physical Uplink Control Channel; PUCCH) is a data acknowledgment acknowledgment (Acknowledgement / Negative Acknowledgement; ACK / NACK) and downlink propagation path information (channel state information). ) Notification and an uplink radio resource allocation request (radio resource request), a scheduling request (Scheduling Request; SR) is used. The channel state information (CSI) includes CQI (Channel Quality Indicator), PMI (Precoding Matrix Indicator), PTI (Precoding Type Indicator), and RI (Rank Indicator). Each indicator may be expressed as “Indication”, but its use and meaning are the same.

The physical downlink shared channel (Physical Downlink Shared Channel; PDSCH) is also used to notify the terminal device as layer 3 messages, in addition to downlink data, broadcast information (system information) not notified by paging or physical broadcast information channel. Is done. The radio resource allocation information of the physical downlink shared channel is indicated by the physical downlink control channel.

The physical uplink shared channel (Physical Uplink Shared Channel; PUSCH) mainly transmits uplink data and uplink control data, and can also include control data such as downlink reception quality and ACK / NACK. In addition to uplink data, it is also used to notify the base station apparatus of uplink control information as a layer 3 message. Similarly to the case of the downlink, the radio resource allocation information of the physical uplink shared channel is indicated by the physical downlink control channel.

An uplink reference signal (Uplink Reference Signal) (also referred to as an uplink pilot signal or an uplink pilot channel) is used by the base station device to demodulate the physical uplink control channel PUCCH and / or the physical uplink shared channel PUSCH. A demodulation reference signal (Demodulation Reference Signal; DMRS) to be used and a sounding reference signal (Sound Reference Reference Signal; SRS) used mainly by the base station apparatus to estimate an uplink channel state are included. The sounding reference signal includes a periodic sounding reference signal (Periodic SRS) and an aperiodic sounding reference signal (Aperiodic SRS).

The physical random access channel (Physical Random Access Channel; PRACH) is a channel used to notify a preamble sequence and has a guard time. The preamble sequence is configured so as to express 6-bit information by preparing 64 types of sequences. The physical random access channel is used as an access means for the terminal device to the base station device. The terminal apparatus also transmits a radio resource request when the physical uplink control channel is not set, and transmission timing adjustment information (timing advance (Timing Advance; TA)) necessary for matching the uplink transmission timing to the reception timing window of the base station device. Is called a physical random access channel.

Specifically, the terminal apparatus transmits a preamble sequence using the radio resource for the physical random access channel set by the base station apparatus. The terminal device that has received the transmission timing adjustment information sets a transmission timing timer that measures the effective time of the transmission timing adjustment information that is commonly set by the broadcast information (or set individually by the layer 3 message), and transmits The uplink state is managed as a transmission timing adjustment state during the effective time (timing) of the timing timer, and as a transmission timing non-adjustment state (transmission timing unadjusted state) outside the effective period (during stop). The layer 3 message is a control-plane message exchanged between the terminal device and the RRC (radio resource control) layer of the base station device, and is used in the same meaning as the RRC signaling or RRC message. Since other physical channels are not related to each embodiment of the present invention, detailed description thereof is omitted.

[Measurement]
FIG. 14 is a sequence chart for explaining a radio resource management (RRM) measurement setting management method for a terminal apparatus and a base station apparatus in EUTRA.

In the example of FIG. 14, it is assumed that the base station apparatus can use two different frequencies F1 and F2 as frequencies operated by the own station, and the terminal apparatus and the base station apparatus have established a wireless connection at the frequency F1. State (radio resource control connection state (Radio Resource Control Connected: RRC_Connected)). Here, the base station apparatus causes the terminal apparatus to measure a message including measurement settings in order to cause the terminal device to measure the reception quality of the cell (the serving cell) and other cells (neighboring cells) (hereinafter referred to as a measurement setting message). ) Is transmitted (step S141). The measurement setting message includes at least one measurement setting information for each frequency (frequency F1 and frequency F2) to be measured. The measurement setting information includes a measurement ID, a measurement object (measurement object), a measurement object ID corresponding to the measurement object, a report setting including a measurement event, and a report setting ID corresponding to the report setting. A plurality of report setting IDs may be linked to one measurement target ID. Similarly, one report setting ID may be linked to a plurality of measurement target IDs.

Also, the measurement setting message can include a measurement gap setting (measGapConfig) and a threshold value called s-Measure.

The measurement gap setting is a period (gap period) in which the base station apparatus does not perform transmission to the terminal apparatus in the serving cell in order for the terminal apparatus to measure a cell of a different frequency or a neighboring cell of a system of a different radio communication technology. ) Is set and notified to the terminal device, so that the terminal device can stop the reception operation in the serving cell and measure the neighboring cell of a different frequency or a system of a different radio communication technology. is there. In this measurement gap setting, parameters such as a gap pattern identifier (gp0 or gp1) and a gap pattern identifier value (gap offset) are notified. Based on the notified gap pattern identifier, the measurement gap length (MGL), the measurement gap repetition period (MGRP), the minimum measurement time (Tinter1) in the 480 ms period is determined, and based on the notified gap offset, the measurement gap Is determined. The MGL, MGRP, Tinter1, and gap offset are collectively referred to as measurement gap related parameters in the present application. In addition, one measurement gap can be set for the terminal device, and the terminal device performs measurement for all systems of different frequencies and different wireless communication technologies using the gap period. In addition, based on the measurement gap setting, the number of different frequencies to be measured, the type of wireless communication technology, and other settings, the time for detecting and measuring the cell is specified. It is necessary to detect and measure the cell within. For example, when discontinuous reception (DRX) is not set in a frequency division duplex (FDD) system, a terminal device that performs measurement at Nfreq different frequencies is Tendify_inter = 480 × 480 ÷ Tinter1 × Nfreq [ms (milliseconds). )] Must be able to detect EUTRA cells present in each frequency.

The s-Measure is a parameter for setting the neighbor cell measurement when the received power of the serving cell falls below the threshold (s-Measure). When the communication quality of the serving cell is good, the handover is performed. Therefore, unnecessary neighbor cell measurement can be prevented. One s-Measure can be set for the terminal device. When it is set to 0 or not set, the terminal device always performs the set measurement regardless of the quality of the serving cell.

Next, the measurement setting message will be described with a specific example. Here, a case where two measurement objects (frequency F1 and frequency F2) and three report settings are notified and three measurement IDs are set for the combination of the measurement object and the report settings is described with reference to FIG. explain.

For example, the base station apparatus assigns

identifiers

0 and 1 as measurement target IDs to the frequency F1 and the frequency F2, respectively, as measurement objects, and notifies the terminal apparatus of the assignment. Further, the base station apparatus assigns

identifiers

0, 1, and 2 as report setting IDs to report setting 1, report setting 2, and report setting 3, respectively, and notifies the terminal apparatus of the report settings. Further, the base station apparatus notifies the terminal apparatus of a measurement ID linked (linked) to the combination of the measurement target identifier and the report setting identifier. Also, the base station apparatus notifies the terminal apparatus of measurement gap setting, s-Measure, and the like as necessary.

In FIG. 15, a combination of the measurement target (frequency F1) with identifier 0 and the report setting with identifier 0 is specified as measurement ID # 0. Similarly, the combination of the measurement target of identifier 0 (frequency F1) and the report setting of identifier 1 is designated as measurement ID # 1, and the combination of measurement target of identifier 1 (frequency F2) and the report setting of identifier 2 is measured. It is specified as ID # 2.

Also, the measurement event information is, for example, when the reception quality of the cell-specific reference signal of the serving cell is below / above a predetermined threshold, the reception quality of the cell-specific reference signal of the neighboring cell is higher than that of the serving cell. It is information composed of a measurement event indicating a condition such as when the reception quality of a neighboring cell exceeds a predetermined threshold when it falls below, and a parameter used to determine the condition. Information such as a threshold value, an offset value, and a time required for establishment of a measurement event is set in the parameter. Non-Patent Document 3 defines, for example, that a measurement event A1 is reported when the reception quality of a serving cell becomes better than a threshold value. Further, as measurement event A3, it is defined that reporting is performed when the reception quality of the neighboring cell becomes better than the reception quality of the serving cell plus the offset value. Moreover, it is defined as measurement event A4 to report when the reception quality of an adjacent cell becomes better than a threshold value.

In step S142, the terminal apparatus stores the measurement setting information set (notified) from the base station apparatus as internal information. If the measurement setting information can be set without error, the terminal device transmits a message indicating completion of measurement setting (measurement setting completion message) to the base station device in step S143. As described above, the terminal device manages the measurement ID, the measurement object ID, and the report setting ID so as to be linked together, and starts measurement based on the measurement information corresponding to each ID. If these three IDs are linked to one, it is considered valid and the associated measurement is started. If these three IDs are not linked to one (one of the IDs is not set) ), The relevant measurement is not started as invalid.
When measurement of a system of a different frequency or a different wireless communication technology is set, the terminal device performs measurement using the gap period based on the measurement gap setting. In addition, when s-Measure is notified, the terminal device may measure a neighboring cell only when the received power of the serving cell falls below a threshold (s-Measure).

Then, when any of the set measurement events satisfies the condition according to the parameter in the terminal device, the measurement report message is transmitted to the base station device assuming that the measurement event is triggered (step S144). ). In the measurement report message, at least the measurement ID linked to the report setting ID of the triggered measurement event and, if necessary, the measurement result of the associated cell are set and reported. Since the base station apparatus knows to which measurement event report setting ID the measurement ID is linked, the terminal apparatus does not need to notify the report setting ID in the measurement report message.

[Intermittent reception]
The reception of PDCCH and PDSCH includes a continuous reception mode and a discontinuous reception (DRX) state. As shown in FIG. 16, in the intermittent reception mode, the power consumption of the terminal device can be suppressed by limiting the period during which the terminal device connected to the base station device performs the reception operation.

The terminal device starts DRX when the reception of PDCCH and PDSCH addressed to itself is stopped in the continuous reception state after parameters related to intermittent reception (reception ON period, DRX interval, DRX start position, etc.) are designated from the base station device. Transition from the position to the intermittent reception state.

When entering the intermittent reception state, the terminal apparatus receives (monitors) the PDCCH during the reception ON period designated by the base station apparatus, and determines whether or not the data addressed to the terminal apparatus is included in the PDCCH. When the data addressed to the terminal device is included in the PDCCH, the reception ON period is extended and reception of the PDCCH and PDSCH is continued. Here, when the reception ON period is extended, the reception OFF period is shortened accordingly.

The intermittent reception status includes short interval intermittent reception (Short DRX) and long interval intermittent reception (Long DRX). Short DRX is a DRX with a shorter DRX interval than Long DRX. In addition to the parameters related to intermittent reception at long intervals, the terminal device is notified of parameters related to intermittent reception at short intervals (short interval intermittent reception interval (shortDRX-Cycle), short interval intermittent reception timer (drxShortCycleTimer)). May be. When a parameter related to short interval intermittent reception is notified, the terminal device first enters an intermittent reception state from Short DRX. Then, when the data addressed to the terminal device is not included in the PDCCH for a certain period (period specified by the short interval intermittent reception timer), the short DRX is automatically shifted to the Long DRX. FIG. 17 shows the relationship between continuous reception, Short DRX, and Long DRX. The Short DRX interval is 2 ms to 640 ms, and the Long DRX interval is 10 ms to 2560 ms, each of which is designated by the base station apparatus.

As described above, the parameters relating to the intermittent reception include the DRX interval, the reception ON period indicating the period during which PDCCH is received, and the reception ON extension period for extending the reception ON period when the PDCCH is received within the reception ON period. , DRX start position, reception ON period at the time of retransmission, short interval intermittent reception timer, and the like, which are sent to the terminal device by an RRC layer (Radio Resource Control Layer) message.

In consideration of the above matters, preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In the description of the embodiment of the present invention, when it is determined that a specific description of known functions and configurations related to the embodiment of the present invention obscures the gist of the embodiment of the present invention. Detailed description thereof will be omitted.

[First Embodiment]
A first embodiment of the present invention will be described below.

FIG. 1 is a block diagram showing an example of a base station apparatus 1 according to an embodiment of the present invention. The base station apparatus 1 includes a reception unit 101, a demodulation unit 102, a decoding unit 103, a control unit 104, a coding unit 105, a modulation unit 106, a transmission unit 107, a network signal transmission / reception unit 108, and an upper layer unit 109.

The upper layer section 109 outputs the downlink traffic data and the downlink control data to the encoding section 105. The encoding unit 105 encodes each input data and outputs the encoded data to the modulation unit 106. Modulation section 106 modulates the signal input from encoding section 105. Further, the signal modulated in the modulation unit 106 is multiplexed with a downlink reference signal and mapped as a frequency domain signal. Transmitter 107 converts the signal input from modulator 106 into a time-domain signal, places the converted signal on a carrier having a predetermined frequency, performs power amplification, and transmits the signal. The downlink data channel in which the downlink control data is arranged typically constitutes a layer 3 message (RRC (Radio Resource Control) message).

Also, the receiving unit 101 converts a received signal from the terminal device 2 (see FIG. 2) into a baseband digital signal. The digital signal converted by the reception unit 101 is input to the demodulation unit 102 and demodulated. The signal demodulated by the demodulator 102 is then input to the decoder 103 and decoded. Decoding section 103 appropriately separates the received signal into uplink traffic data and uplink control data, and outputs them to upper layer section 109, respectively.

Base station apparatus control information necessary for controlling each of these blocks is input from the upper layer section 109 to the control section 104. From the control section 104, base station apparatus control information related to transmission is transmitted as transmission control information. 105, the modulation unit 106, and the transmission unit 107 are appropriately input to each block of the reception unit 101, the demodulation unit 102, and the decoding unit 103 as reception control information.

On the other hand, the network signal transmitting / receiving unit 108 transmits or receives a control message between a plurality of base station apparatuses 1 (or control station apparatus (MME), gateway apparatus (Gateway), MCE) and the base station apparatus 1. . Control messages are transmitted and received via a network line. Control messages are exchanged on logical interfaces called S1 interface, X2 interface, M1 interface, and M2 interface. In FIG. 1, the other components of the base station apparatus 1 are not related to the present embodiment, and are omitted.

FIG. 2 is a block diagram showing an example of the terminal device 2 according to the embodiment of the present invention. The terminal device 2 includes a receiving unit 201, a demodulating unit 202, a decoding unit 203, a measuring unit 204, a control unit 205, a random access processing unit 206, a coding unit 207, a modulating unit 208, a transmitting unit 209, and an upper layer unit 210. Is done.

Prior to reception, the upper layer unit 210 outputs terminal device control information to the control unit 205. The control unit 205 appropriately outputs the terminal device control information related to reception to the reception unit 201, the demodulation unit 202, the decoding unit 203, and the measurement unit 204 as reception control information. The reception control information includes information such as demodulation information, decoding information, reception frequency band information, reception timing for each channel, multiplexing method, and radio resource arrangement information as reception schedule information.

The receiving unit 201 receives a signal from the base station apparatus 1 to be described later through one or more receivers (not shown) in the frequency band notified by the reception control information, and converts the received signal into a baseband digital signal. To the demodulator 202. In addition, the reception unit 201 outputs the received reference signal to the measurement unit 204. Demodulation section 202 demodulates the received signal and outputs it to decoding section 203. Decoding section 203 correctly decodes the demodulated signal based on the reception control information, appropriately separates it into downlink traffic data and downlink control data, and outputs each to upper layer section 210. When the measurement setting message is included in the signal decoded by the decoding unit 203, the upper layer unit 210 notifies the measurement unit 204 of the measurement / report setting specified by the measurement setting message. The measurement unit 204 measures RSRP, RSRQ, and the like of the received reference signal and outputs the measurement result to the upper layer unit 210.

Also, prior to transmission, the upper layer unit 210 outputs terminal device control information to the control unit 205. The control unit 205 appropriately outputs terminal device control information related to transmission to the random access processing unit 206, the encoding unit 207, the modulation unit 208, and the transmission unit 209 as transmission control information. The transmission control information includes information such as encoding information, modulation information, transmission frequency band information, transmission timing for each channel, multiplexing method, and radio resource arrangement information as uplink scheduling information of the transmission signal.

The upper layer unit 210 appropriately outputs the uplink traffic data and the uplink control data to the encoding unit 207 according to the uplink channel. The encoding unit 207 appropriately encodes each data according to the transmission control information and outputs the data to the modulation unit 208. Modulating section 208 modulates the signal encoded by encoding section 207. Also, the modulation unit 208 multiplexes the downlink reference signal with the modulated signal and maps it to the frequency band.

The transmission unit 209 converts the frequency band signal output from the modulation unit 208 into a time-domain signal, places the converted signal on a carrier having a predetermined frequency, performs power amplification, and at least one transmitter (not shown) Send from.

In FIG. 2, the other components of the terminal device 2 are omitted because they are not related to the present embodiment.

Next, the structure of the radio interface protocol between the base station device and the terminal device is shown. FIG. 3 is a block diagram showing a radio protocol structure (radio protocol) of a user plane (user plane). FIG. 4 is a block diagram showing a radio protocol structure of a control plane (control plane; C plane). The user plane is a protocol stack for user data transmission / reception, and the control plane is a protocol stack for control signal transmission / reception.

3 and 4, the physical layer (Physical layer), which is the first layer (layer 1), uses the above-described physical channel between different physical layers, that is, between the physical layer on the transmission side and the reception side. Communication takes place. The physical layer is connected to the upper medium access control (Medium Access Control; MAC) layer via a transport channel (Transport channel), through which the physical layer transfers information to the MAC layer. (Information transfer service).

In the MAC layer of the second layer (layer 2), mapping between logical channels (logical channels) and transport channels, error correction by HARQ (Hybrid Automatic Automatic Repeats reQuest), transfer processing based on priority between logical channels, etc. It is carried out. The MAC layer is connected to a radio link control (Radio Link Control; RLC) layer, which is an upper layer, via a logical channel.

The RLC layer in the second layer supports data transfer reliability. There are three types of operation modes in the RLC layer, depending on the data transmission method, transparent mode (Transparent Mode; TM), non-acknowledged mode (Unacknowledged Mode; UM), and response mode (Acknowledged Mode; AM). In AM, error correction by ARQ, protocol error detection, and the like are performed.

The PDCP (Packet Data Convergence Protocol) layer in the second layer performs header compression to reduce the IP packet header size, data encryption, and decryption.

The radio resource control (Radio Resource Control; RRC) layer of the third layer (Layer 3) is defined only in the control plane. The RRC layer broadcasts NAS (non-access stratum) and AS (access stratum) related information, manages RRC connection (Establishment / maintenance / release), configures radio bearer (Radio Bearer; RB), re- It performs configuration (re-configuration) and release (release), mobility (handover), measurement management and reporting, QoS management, and the like.

The NAS layer located above the RRC layer performs session management and mobility management.

Here, the MAC layer and the RRC layer of the base station device 1 exist as a part of the upper layer unit 109. Further, the MAC layer of the terminal device 2 exists as part of the random access processing unit 206 and the upper layer unit 210, and the RRC layer of the terminal device 2 exists as part of the measurement unit 204 and the upper layer unit 210.

Subsequently, measurement configuration (Measurement Configuration) in the present embodiment will be described.

The measurement settings in the present embodiment are the same as the above-described conventional RRM measurement settings, such as the measurement ID, the measurement object (measurement object), the measurement object ID corresponding to the measurement object, the report event setting such as the measurement event, and the report It consists of a report setting ID corresponding to the setting. Furthermore, in the present embodiment, when the terminal device 2 satisfies a predetermined condition, identifier information (GrayCell information) of a cell (GrayCell) that is not measured and / or reported can be set as a measurement target. Specifically, an element for adding or deleting the GrayCell is included in the setting of the measurement target. Here, when the cell indicated as GrayCell is a small cell for offload, for example, the predetermined condition is that the reception power and / or reception quality of the serving cell is equal to or higher than a set threshold value, or When the terminal device is moving at high speed, or when the received power and / or reception quality of the serving cell is equal to or higher than a set threshold and the terminal device is moving at high speed, It is desirable that the cell is not useful for handing over to the cell. Furthermore, when a terminal device has handed over to a serving cell, or when semi-persistent scheduling (SPS) is assigned to the serving cell, or the serving cell is set to the small cell frequency. In some cases, or a combination of a plurality of conditions including the received power and reception quality of the serving cell, the moving speed of the terminal device, and the like may be used as the default condition. Note that in Non-Patent Document 4, the terminal device is a cell that does not report to the base station device when the reception power and reception quality of the serving cell are equal to or higher than the threshold and the terminal device is moving at high speed. It defines that Gray Listed cells are defined and included in the measurement target.

Fig. 5 shows an example of defining two measurement objects as measurement settings. The measurement setting includes a report setting in addition to the measurement target, and a measurement ID is set for the combination of the measurement target and the report setting.

In FIG. 5, the combination of the measurement target (frequency F2, GrayCell information) with identifier 0 and report setting 1 with identifier 0 is designated as measurement ID # 0. Similarly, a combination of a measurement target (frequency F3, GrayCell information) with identifier 1 and report setting 1 with identifier 0 is designated as measurement ID # 1. Here, it is assumed that the above-described event A3 is designated as the measurement event as the report setting 1.

Subsequently, the measurement unit 204 in the present embodiment will be described with reference to FIG.

The measurement unit 204 includes an RRC layer reference signal measurement unit 61 and a PHY layer reference signal measurement unit 62. The PHY layer reference signal measurement unit 62 measures the RSRP, RSRQ, channel state, and the like of the reference signal input from the reception unit 201 and notifies the RRC layer reference signal measurement unit 61 of it. The RRC layer reference signal measurement unit 61 averages the individual measurement results notified from the PHY layer reference signal measurement unit 62 in the measurement target set by the measurement setting notified from the upper layer unit 210, if necessary. It is determined whether or not the report setting is met, and the measurement result is notified to the upper layer unit 210. Here, when the measurement cell of the measurement setting notified from the higher layer unit 210 includes GrayCell information, the measurement unit 204 measures the cell included in the GrayCell information and / or satisfies the preset condition. Or do not report. That is, the measurement unit 204 performs the first cell that does not perform measurement and / or reporting when a preset condition is satisfied, and the second cell that performs measurement and reporting regardless of whether or not the preset condition is satisfied. The higher layer unit 210 is notified of the measurement result of the cell.

As described above, the result measured by the measurement unit 204 is notified to the upper layer unit 210, and the upper layer unit 210 transmits a measurement report to the base station apparatus 1 when the conditions of the set measurement event are satisfied. A message is generated, and the generated measurement report message is transmitted to the base station apparatus 1. In the measurement report message, at least the measurement ID linked to the report setting ID of the triggered measurement event and, if necessary, the measurement result of the associated cell are set and reported.

An example of the operation (intermittent reception control) of the terminal device 2 after transmitting the measurement report message will be described with reference to the flowchart of FIG.

In FIG. 7, first, the terminal apparatus 2 that has transmitted the measurement report message to the base station apparatus 1 confirms whether or not the short-term intermittent reception is set in the terminal apparatus (step S71).

In step S71, if short interval intermittent reception is not set, the process ends. In step S71, when short interval intermittent reception is set, the process proceeds to step S72.

In step S72, the terminal device 2 confirms whether or not the GrayCell included in the measurement target is included in a cell that satisfies the measurement event condition. In step S72, if the GrayCell is not included in the cell that satisfies the conditions of the measurement event, the process ends. In Step S72, when GrayCell is included in a cell that satisfies the conditions of the measurement event, the process proceeds to Step S73.

In step S73, the terminal device 2 changes the short interval intermittent reception timer value set in the own terminal device (so as to be larger than the set value), and has a longer period than normally set, The process ends without making a transition to the long interval intermittent reception state.

Note that the above-described flowchart is an example, and there is no problem in operation even if the order of step S71 and step S72 is reversed. Further, this process may be performed before the measurement report message is transmitted.

Next, an example of the operation (message transmission control) of the base station apparatus 1 that receives the measurement report message will be described with reference to the flowchart of FIG.

In FIG. 8, the base station apparatus 1 that has received the measurement report message from the terminal apparatus 2 confirms whether or not the terminal apparatus 2 is set to be intermittently received at short intervals (step S81).

In step S81, the base station device 1 terminates the process if the terminal device 2 is not set to be intermittently received at short intervals. If it is determined in step S81 that short-term intermittent reception is set for the terminal device 2, the process proceeds to step S82.

In step S82, the base station apparatus 1 confirms whether or not the measurement report relates to the GrayCell. In step S82, if the measurement report is not related to GrayCell, the process is terminated. In step S82, when the measurement report is related to GrayCell, the process proceeds to step S83.

In step S83, the base station device 1 changes the short interval intermittent reception timer value set in the terminal device 2 (that is, a longer interval for a longer period than the terminal device 2 is normally set). Assuming that the transition to the intermittent reception state is not performed), message transmission control for the terminal device (timing control of message transmission to the terminal device 2) is performed.

Note that the above-described flowchart is an example, and there is no problem in operation even if the order of steps S81 and S82 is reversed.

As described above, when the measurement report in the measurement including GrayCell information in the measurement object relates to the GrayCell (such as when the neighboring cell measurement information of the measurement report includes GrayCell or the measurement object is only GrayCell). Only by changing the short interval intermittent reception timer value (so as to be larger than the set value) so as to be able to receive instructions regarding mobility (handover) from the base station apparatus 1 without delay, It is possible to perform efficient intermittent reception control that suppresses an increase in unnecessary power consumption of the device 2.

Note that the short interval intermittent reception timer value after the change described above may be a value uniquely defined by the communication system used, may be broadcast as system information, or is notified by RRC signaling (for example, measurement setting). May be.

For example, a predetermined value is set for the short interval intermittent reception timer value after the change, and 1-bit information indicating whether to apply the value may be included in the measurement setting. Alternatively, the 1-bit information may not be included in the measurement setting, but may be defined so that the value is applied to a specific measurement event. Or you may define so that the said value may be applied when GrayCell information is contained in a measuring object.

Here, an example in which the changed short interval intermittent reception timer value is applied to the specific measurement event (here, measurement event A3) will be described. FIG. 13 shows an example of measurement settings. In FIG. 13, as measurement ID # 0, a combination of a measurement target with identifier 0 (frequency F2, GrayCell information) and report setting 1 with identifier 0 (measurement event A1) is designated. Similarly, a combination of a measurement target (frequency F2, GrayCell information) with identifier 0 and report setting 2 (measurement event A3) with identifier 1 is designated as measurement ID # 1. The terminal device 2 performs measurement report to the base station device 1 based on this measurement setting. When reporting measurement ID # 0, since it is a measurement report for measurement event A1, the short interval intermittent reception timer value is not changed after the measurement report. When reporting measurement ID # 1, since it is a measurement report for measurement event A3, the measurement report is related to GrayCell (if one or more GrayCells are included in the neighboring cell measurement information of the measurement report or the measurement target is only GrayCell) If it is configured, the short interval intermittent reception timer value is changed.

The short interval intermittent reception timer value changed here may be controlled so as to return to the original value once by shifting to the long interval intermittent reception, or by the explicit command from the base station apparatus 1. The base station apparatus 1 may be configured to overwrite the short interval intermittent reception timer value by resetting the parameter related to intermittent reception, or may be controlled by a combination thereof. May be.

Alternatively, instead of changing the short interval intermittent reception timer value, the short interval intermittent reception timer may be controlled to be suspended or stopped during the short interval intermittent reception operation. In this case, the base station apparatus 1 may be able to instruct resumption in order to resume intermittent reception at long intervals. The resumption instruction can be realized by, for example, a command in the MAC layer (a newly defined command for resumption or a DRX command for instructing migration to an existing DRX).

Alternatively, without using the short interval intermittent reception timer value, the setting of the long interval intermittent reception is invalidated for a certain period (the short interval intermittent reception period until the transition to the preset long interval intermittent reception state is extended) Control). An example of notifying the period during which the setting of intermittent reception at long intervals is invalidated according to the measurement setting is shown below.

FIG. 9 is a diagram showing an example of notification including a period for disabling the setting of intermittent reception at long intervals in the report setting. In FIG. 9, a combination of a measurement target with identifier 0 (frequency F2, GrayCell information) and report setting 1 with identifier 0 (invalid period information) is designated as measurement ID # 0. Similarly, a combination of a measurement target (frequency F3, GrayCell information) with identifier 1 and report setting 2 with identifier 0 is designated as measurement ID # 1.

When the measurement setting of the terminal device 2 performs the measurement report of the measurement ID # 1, since the invalid period information is not included even if the measurement report relates to the GrayCell, the long interval intermittent reception setting is performed. Do not disable. When the terminal device 2 performs the measurement report of the measurement ID # 0, if the measurement report is related to the GrayCell, the setting of intermittent reception of a certain period long interval is invalidated according to the invalid period information specified in the report setting. (Extend the short interval intermittent reception period until shifting to the preset long interval intermittent reception state).

Here, an example of including invalid period information in the report setting is shown, but it may be included in the measurement target.

In addition, although an example has been described here in which the measurement setting includes a period in which the setting of intermittent reception at long intervals is invalidated, the present invention is not limited to this. For example, a predetermined value is set for a period in which the setting of intermittent reception at long intervals is invalidated, and 1-bit information indicating whether or not to apply the value may be included in the measurement setting. . Alternatively, the predetermined value may be defined to be applied to a specific measurement event instead of including the 1-bit information in the measurement setting. Or when GrayCell information is contained in a measuring object, you may define so that the above-mentioned default value may be applied.

As described above, when the measurement report is related to the GrayCell, the change of the short interval intermittent reception timer value and the temporary invalidation of the long interval intermittent reception can be set according to the measurement object and the report setting (measurement event). By doing so, it becomes possible to perform efficient intermittent reception control that suppresses an increase in unnecessary power consumption of the terminal device 2. Further, the amount of signaling from the base station device 1 to the terminal device 2 can be reduced by associating the type of measurement event with the intermittent reception control.

[Second Embodiment]
Hereinafter, a second embodiment of the present invention will be described. In the first embodiment, the example in which the change of the short interval intermittent reception timer value or the temporary invalidation of the long interval intermittent reception is controlled based on whether or not the measurement report is related to the GrayCell included in the measurement setting is shown. In addition, in this embodiment, the example which performs the said control based on the cell in which the terminal device 2 exists in addition to it is shown.

Since the communication system (base station apparatus 1 and terminal apparatus 2) used in the description of this embodiment is the same as that in FIG. 1 and FIG. 2 in the first embodiment, detailed description will not be repeated.

In this embodiment, it is assumed that the terminal device 2 recognizes whether or not the cell in which the terminal device is located is a cell that satisfies a predetermined condition (here, a small cell). For example, the information broadcast from the base station device 1 may include information on whether or not the cell is a small cell, and is included in the information individually notified from the base station device 1 to the terminal device 2. May be. Alternatively, the terminal device 2 determines whether or not the serving cell is a small cell (whether the transmission power is less than a predetermined threshold) based on the magnitude of the transmission power notified or notified from the base station device 1. May be.

The measurement setting in this embodiment will be described with reference to FIG. Here, an example of disabling the setting of intermittent reception at long intervals is shown as an example, but the present invention is not limited to this, and a short interval intermittent reception timer value may be used as in the first embodiment.

In FIG. 10, the combination of the measurement target (frequency F2, GrayCell information) with identifier 0 and report setting 1 with identifier 0 is designated as measurement ID # 0. Similarly, a combination of a measurement target (frequency F3, GrayCell information) with identifier 1 and report setting 1 with identifier 0 is designated as measurement ID # 1. Here, the report setting 1 and the report setting 2 include 1-bit information (invalidation information) indicating whether or not to disable the setting of intermittent reception at long intervals.

Similar to the first embodiment, the measurement unit 204 of the terminal device 2 notifies the upper layer unit 210 of the measurement result based on the measurement setting, and the upper layer unit 210 satisfies the condition of the set measurement event. In this case, a measurement report message to be transmitted to the base station apparatus 1 is generated, and the generated measurement report message is transmitted to the base station apparatus 1.

An example of the operation (intermittent reception control) of the terminal device 2 after transmitting the measurement report message for the measurement ID linked to the report setting including the invalidation information to the base station device 1 using the flowchart of FIG. explain.

In FIG. 11, first, the terminal apparatus 2 that has transmitted the measurement report message to the base station apparatus 1 confirms whether or not the short-term intermittent reception is set in the terminal apparatus (step S111).

In step S111, if short interval intermittent reception is not set, the process ends. In step S111, when short interval intermittent reception is set, the process proceeds to step S112.

In step S112, the terminal device 2 confirms whether or not the serving cell is a small cell. If the serving cell is not a small cell, the terminal device 2 proceeds to step S113. If the serving cell is a small cell, the terminal device 2 proceeds to step S114. To do.

In step S113, the terminal device 2 confirms whether or not the GrayCell included in the measurement target is included in a cell that satisfies the measurement event condition. In step S113, if the GrayCell is not included in the cell that satisfies the measurement event condition, the process ends. In Step S113, when the GrayCell is included in a cell that satisfies the conditions of the measurement event, the process proceeds to Step S114.

In step S114, the terminal device 2 temporarily disables the setting of the long interval intermittent reception set in the terminal device itself (short interval intermittent reception until shifting to the preset long interval intermittent reception state). Extending the period), the process ends without making a transition to the intermittent reception state with a long interval.

The above-described flowchart is an example, and even if step S111 is performed immediately before step S114, there is no problem in operation. Further, this process may be performed before the measurement report message is transmitted.

In FIG. 12, the base station device 1 that has received the measurement report message from the terminal device 2 confirms whether or not the terminal device 2 is set to be intermittently received at short intervals (step S121).

In step S121, the base station apparatus 1 terminates the process if the terminal apparatus 2 is not set to be intermittently received at short intervals. In step S121, when the short interval intermittent reception is set for the terminal device 2, the process proceeds to step S122.

In step S122, the base station apparatus 1 confirms whether or not the own cell communicating with the terminal apparatus 2 is a small cell. If the own cell is not a small cell, the base station apparatus 1 proceeds to step S123. If so, the process proceeds to step S124.

In step S123, the base station device 1 confirms whether the measurement report is related to the GrayCell. In step S123, when the measurement report is not related to the GrayCell, the process ends. In step S123, when the measurement report relates to GrayCell, the process proceeds to step S124.

In step S124, the base station device 1 regards the long interval intermittent reception setting set in the terminal device 2 as temporarily invalid (that is, the terminal device 2 enters the long interval intermittent reception state). The message transmission control for the terminal device 2 (message transmission timing control for the terminal device 2) is performed.

Note that the above-described flowchart is merely an example, and even if step S121 is performed immediately before step S124, there is no problem in operation.

As described above, the serving cell is a small cell when the terminal device 2 performs a measurement report for a measurement ID linked to a report setting including invalidation information for invalidating the setting of intermittent reception at a long interval. Or when the measurement report message is related to GrayCell, the setting of intermittent reception at long intervals is temporarily invalidated so that instructions regarding mobility (handover) from the base station apparatus 1 can be received without delay. This makes it possible to perform efficient intermittent reception control that suppresses an increase in unnecessary power consumption of the terminal device 2.

Note that the period for invalidating the setting of the intermittent reception at the long interval may be a period uniquely defined by the communication system used, as in the first embodiment, or RRC signaling (for example, measurement setting). May be notified.

In this embodiment, the invalidation information is included in the report setting. However, the invalidation information may be included in the measurement target, or the above-described long interval intermittent reception may be performed for a specific measurement event. You may define to apply the period which invalidates the setting of. For example, when the measurement object including GrayCell information is linked to the report setting of a specific event (for example, measurement event A3 and measurement event A5 here), the above-described setting of intermittent reception at long intervals is invalidated. You may make it apply a period. FIG. 13 shows an example of measurement settings. In FIG. 13, as measurement ID # 0, a combination of a measurement target with identifier 0 (frequency F2, GrayCell information) and report setting 1 with identifier 0 (measurement event A1) is designated. Similarly, a combination of a measurement target (frequency F2, GrayCell information) with identifier 0 and report setting 2 (measurement event A3) with identifier 1 is designated as measurement ID # 1. The terminal device 2 performs measurement report to the base station device 1 based on this measurement setting. When reporting the measurement ID # 0, since it is a measurement report for the measurement event A1, the setting for intermittent reception at long intervals is not invalidated after the measurement report. When reporting measurement ID # 1, since it is a measurement report for measurement event A3, if the serving cell is a small cell, or if the measurement report relates to GrayCell, the setting of long-term intermittent reception is set. Disable temporarily. Thus, the amount of signaling from the base station apparatus 1 to the terminal apparatus 2 can be reduced by associating the type of measurement event with the intermittent reception control.

In each of the above-described embodiments, the temporary change of the short interval intermittent reception timer value and the temporary invalidation of the long interval intermittent reception are described, but the setting of the long interval intermittent reception is not invalidated. The interval of intermittent reception may be changed (controlled to be shorter). That is, in each of the above-described embodiments, an example in which a period in which the transition to the long interval intermittent reception is not performed (the setting of the long interval intermittent reception is invalidated) is set. You may make it set the period to change. The interval of intermittent reception after the change may be uniquely defined by the communication system used, may be broadcast as system information, or may be notified by RRC signaling (for example, measurement setting). In addition, the period for applying the changed intermittent reception interval of the long interval is not set as described above, but until there is an explicit instruction (such as a command for canceling application in the MAC layer) by the base station apparatus. It may be continued.

Further, in each of the above-described embodiments, the long interval intermittent reception is described. However, the present invention is not limited to this, and the transition to the short interval intermittent reception (Short DRX) may be controlled.

In each of the above-described embodiments, the example in which the base station device 1 and the terminal device 2 perform communication in one cell has been described. However, the present invention is not limited to this, and the present invention is applicable to a system that performs communication using a plurality of cells. Is also possible. For example, even in a system in which communication is performed using one primary cell (PCell) called carrier aggregation and one or a plurality of secondary cells (SCell), the setting for intermittent reception may be common to PCell and SCell. For example, the same control as in each of the above embodiments may be performed. Further, even when the intermittent reception setting is different between the PCell and the SCell, at least in a specific cell (for example, PCell) that transmits and receives a message regarding mobility (handover), the same intermittent reception control as in each of the above embodiments is performed. Just do it.

Further, the names of the parameters shown in the embodiment according to the present invention are referred to for convenience of explanation, and even if the parameter names actually applied and the parameter names of the present invention are different, It does not affect the gist of the claimed invention.

As described above, the embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to the above, and various design changes and the like can be made without departing from the scope of the present invention. It is possible to

Further, the terminal device 2 of the above-described embodiment is not limited to a portable or movable mobile station device, but a stationary or non-movable electronic device installed indoors or outdoors, such as an AV device, a kitchen device, It can also be applied to cleaning / washing equipment, air conditioning equipment, office equipment, vending machines, other life equipment, measuring equipment, and in-vehicle devices. The terminal device is also referred to as a user terminal, a mobile station device, a communication terminal, a mobile device, a terminal, a UE (User Equipment), and an MS (Mobile Station). The base station apparatus is also referred to as a radio base station apparatus, a base station, a radio base station, a fixed station, an NB (Node-B), an eNB (evolved Node-B), a BTS (Base Transceiver Station), or a BS (Base Station). The

Further, for convenience of explanation, the base station device 1 and the terminal device 2 of the embodiment have been described using functional block diagrams, but the functions of each part of the base station device 1 and the terminal device 2 or some of these functions are described. The method or algorithm steps for implementing may be directly embodied by hardware, software modules executed by a processor, or a combination of the two. If implemented by software, the functions may be maintained or transmitted as one or more instructions or code on a computer-readable medium. Computer-readable media includes both communication media and computer recording media including media that facilitate carrying a computer program from one place to another.

Then, one or more instructions or codes are recorded on a computer-readable recording medium, and one or more instructions or codes recorded on the recording medium are read into a computer system and executed, whereby the base station apparatus 1 or The terminal device 2 may be controlled. Here, the “computer system” includes an OS and hardware such as peripheral devices.

The operation described in each embodiment of the present invention may be realized by a program. A program that operates in the base station apparatus 1 and the terminal apparatus 2 related to each embodiment of the present invention is a program (computer installed) that controls a CPU or the like so as to realize the functions of the above-described embodiments related to each embodiment of the present invention. Program to function). Information handled by these devices is temporarily stored in the RAM at the time of processing, then stored in various ROMs and HDDs, read out by the CPU, and corrected and written as necessary. In addition, by executing the program, not only the functions of the above-described embodiments are realized, but also by processing in cooperation with an operating system or other application programs based on the instructions of the program, The functions of the embodiments may be realized.

The “computer-readable recording medium” refers to a semiconductor medium (eg, RAM, nonvolatile memory card, etc.), an optical recording medium (eg, DVD, MO, MD, CD, BD, etc.), a magnetic recording medium (eg, , A magnetic tape, a flexible disk, etc.) and a storage device such as a disk unit built in a computer system. Furthermore, the “computer-readable recording medium” means that a program is dynamically held for a short time, like a communication line when a program is transmitted via a network such as the Internet or a communication line such as a telephone line. In this case, it is intended to include those that hold a program for a certain period of time, such as a volatile memory inside a computer system serving as a server or a client in that case.

Further, the program may be for realizing a part of the above-described functions, and further, may be realized by combining the above-described functions with a program already recorded in a computer system. good.

In addition, each functional block or various features of the base station device 1 and the terminal device 2 used in each of the above embodiments is a general-purpose processor or digital signal processor designed to execute the functions described in this specification. (DSP), application specific or general purpose integrated circuit (ASIC), field programmable gate array signal (FPGA), or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or combinations thereof It can be implemented or implemented by something. A general purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. The general-purpose processor or each circuit described above may be configured by a digital circuit or an analog circuit.

The processor may also be implemented as a combination of computing devices. For example, a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors connected to a DSP core, or a combination of other such configurations. In addition, when an integrated circuit technology that replaces LSI appears due to progress in semiconductor technology, an integrated circuit based on the technology can also be used.

As described above, the embodiments of the present invention have been described in detail based on specific specific examples. However, it is obvious that the gist of the present invention and the scope of the claims are not limited to these specific specific examples. In other words, the description in the present specification is for illustrative purposes and does not limit the present invention.

One embodiment of the present invention can be applied to a wireless communication system, a terminal device, a base station device, a wireless communication method, an integrated circuit, and the like that require efficient intermittent reception control.

DESCRIPTION OF SYMBOLS 1 ... Base station apparatus 2 ...

Terminal device

101, 201 ...

Reception part

102, 202 ...

Demodulation part

103, 203 ... Decoding

part

104, 205 ...

Control part

105, 207 ... Encoding

part

106, 208 ...

Modulation part

107, 209 ... Transmission Unit 108 ... network signal transmitting / receiving

unit

109, 210 ... upper layer unit 204 ... measuring unit 206 ... random access processing unit 61 ... RRC layer reference signal measuring unit 62 ... PHY layer reference signal measuring unit

Claims

A wireless communication system in which a base station device and a terminal device communicate with each other,
The base station device notifies the terminal device of a measurement setting message including information of a cell (GrayCell) that does not perform measurement and / or reporting when the terminal device satisfies a predetermined condition,
The terminal device performs measurement based on the measurement setting message, notifies the base station device of a measurement report message, and when the measurement report message is a report related to the GrayCell, a long-interval intermittently notified in advance A wireless communication system that extends a short interval intermittent reception period until transition to a reception state.
A terminal device that communicates with a base station device,
When the terminal apparatus satisfies a predetermined condition from the base station apparatus, a measurement setting message including information on a cell (GrayCell) that does not perform measurement and / or reporting is received, and a measurement result based on the measurement setting message is received. The base station apparatus is notified as a measurement report message, and when the measurement report message is a report related to the GrayCell, short interval intermittent reception until a transition to the long interval intermittent reception state previously notified to the own terminal apparatus is made. A terminal device that extends the period.
The terminal device according to claim 2,
When the serving cell of the terminal device is a small cell, the mobile terminal shifts to a long-interval intermittent reception state set in advance in the terminal device regardless of whether the measurement report message is a report regarding the GrayCell. A terminal device that extends a short interval intermittent reception period until it is done.
A base station device that communicates with a terminal device,
When the terminal device satisfies a predetermined condition, the terminal device transmits a measurement setting message including information on a cell (GrayCell) that is not measured and / or reported, and based on the measurement setting message from the terminal device When a measurement result is received as a measurement report message, and the measurement report message is a report regarding the GrayCell, a short interval intermittent reception period until a transition to the long interval intermittent reception state previously notified to the terminal device is performed. Base station equipment to be extended.
The base station apparatus according to claim 4, wherein
When the serving cell of the terminal device is a small cell, the terminal device transitions to a long-interval intermittent reception state set in advance in the terminal device regardless of whether the measurement report message is a report related to the GrayCell. A base station device that extends the intermittent reception period of short intervals.
A wireless communication method applied to a wireless communication system in which a base station device and a terminal device communicate with each other,
The base station apparatus notifying the terminal apparatus of a measurement setting message including information of a cell (GrayCell) that does not perform measurement and / or reporting when the terminal apparatus satisfies a predetermined condition;
The terminal device performs measurement based on the measurement setting message, notifies the base station device of a measurement report message, and a long interval notified in advance when the measurement report message is a report on the GrayCell. A wireless communication method including at least a step of extending a short interval intermittent reception period until transition to the intermittent reception state.
A wireless communication method applied to a terminal device that communicates with a base station device,
Receiving, from the base station device, a measurement setting message including information on a cell (GrayCell) that does not perform measurement and / or reporting when the terminal device satisfies a predetermined condition; and a measurement based on the measurement setting message A step of notifying the base station apparatus of a result as a measurement report message, and a short period of time until a transition to the intermittent reception state with a long interval previously notified to the own terminal apparatus when the measurement report message is a report on the GrayCell A wireless communication method including at least a step of extending an intermittent reception period of an interval.
A wireless communication method applied to a base station device that communicates with a terminal device,
Transmitting, to the terminal device, a measurement setting message including information on a cell (GrayCell) that is not measured and / or reported when the terminal device satisfies a predetermined condition; and the measurement setting message from the terminal device. A step of receiving a measurement result based on the measurement report message, and when the measurement report message is a report on the GrayCell, a short interval until a transition to the long interval intermittent reception state previously notified to the terminal device is made A wireless communication method including at least a step of extending an intermittent reception period.
An integrated circuit mounted on a terminal device that communicates with a base station device,
A function of receiving a measurement setting message including information on a cell (GrayCell) that does not perform measurement and / or reporting when the terminal apparatus satisfies a predetermined condition from the base station apparatus, and a measurement based on the measurement setting message A function for notifying the base station apparatus of a result as a measurement report message, and a short period of time until a transition to a long interval intermittent reception state previously notified to the own terminal apparatus when the measurement report message is a report related to the GrayCell. An integrated circuit that causes the terminal device to exhibit a function of extending an intermittent reception period of an interval.
An integrated circuit mounted on a base station device that communicates with a terminal device,
A function of transmitting, to the terminal device, a measurement setting message including information on a cell (GrayCell) that is not measured and / or reported when the terminal device satisfies a predetermined condition; and the measurement setting message from the terminal device. A function for receiving a measurement result based on the measurement report message, and when the measurement report message is a report on the GrayCell, a short interval until the terminal device shifts to a long interval intermittent reception state previously notified to the terminal device An integrated circuit that causes the base station apparatus to exhibit a function of extending an intermittent reception period.