JP2019029716A - Radio base station, timing control method, and user terminal - Google Patents

Abstract

To allow a user terminal to acquire frame number again in early stage, when a radio base station resets the frame number.SOLUTION: A radio base station performing radiocommunication with a user terminal having an intermittent reception period set by a host device, includes a signal processing section generating a radio frame, a radio section transmitting the radio frame to the user terminal by radiocommunication, and a generation section generating a paging message instructing the user terminal to acquire notification information containing a frame number, when the signal processing section resets the frame number for synchronizing the radio frame. The signal processing section generates the radio frame containing the paging message over a prescribed time after resetting the frame number, and the radio section transmits the radio frame containing the paging message to the user terminal.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a radio base station, a timing control method, and a user terminal.

  In recent years, technologies related to IoT (Internet of Things) have been actively studied. In IoT, power saving is important. For example, in a user terminal of MTC (Machine Type Communication), power saving such as no need for battery replacement for 10 years or more is considered.

  Examples of the power saving technology include DRX (Discontinuous Reception) or eDRX (extended DRX) (see Non-Patent Document 1, for example). During a period in which no signal is received, the user terminal stops an RF (Radio Frequency) function and enters a sleep state to suppress power consumption.

Takeda et al. “New Technology for Realizing IoT in LTE Release 13” NTT DOCOMO Technical Journal, Jul. 2016, Vol. 24 No. 2 pp. 38-49

  By the way, the radio base station may reset the SFN (System Frame Number) of the radio frame, for example, by restarting such as maintenance. In this case, the user terminal in the sleep state cannot detect the reconfiguration of the SFN of the radio base station, and the SFN becomes inconsistent (asynchronous). There is a possibility that the user terminal whose SFN becomes asynchronous cannot receive the Paging message (call) from the radio base station. However, a technique for causing a user terminal to reacquire SFN at an early stage has not been proposed so far.

  The present invention provides a technique for allowing a user terminal to reacquire a frame number at an early stage when a radio base station resets the frame number.

  The radio base station of the present invention is a radio base station that performs radio communication with a user terminal whose intermittent reception cycle is set by a host device, and a signal processing unit that generates a radio frame; A paging message for instructing the user terminal to acquire broadcast information including the frame number when the signal processing unit resets a radio unit to be transmitted to the user terminal and a frame number for synchronizing the radio frame; A signal generating unit that generates a radio frame including the paging message over a predetermined time after the frame number is reset, and the radio unit generates a radio frame including the paging message. Transmit to the user terminal.

  The radio base station of the present invention is a radio base station that performs radio communication with a user terminal whose intermittent reception cycle is set by a higher-level device, and includes a signal processing unit that generates a radio frame and the radio frame via radio communication Paging for instructing the user terminal to acquire broadcast information including the frame number when the signal processing unit resets a radio number transmitted to the user terminal and a frame number for synchronizing the radio frame A generation unit that generates a message, wherein the signal processing unit generates a radio frame including the paging message over a predetermined time before resetting the frame number, and the radio unit includes a radio including the paging message. A frame is transmitted to the user terminal.

  Further, the radio base station of the present invention is a radio base station that performs radio communication with a user terminal whose intermittent reception cycle is set by a higher-level device, and when radio wave output is stopped, from the intermittent reception cycle of the user terminal A radio unit that stops radio wave output for a long time.

  According to the present invention, when the radio base station resets the frame number, the user terminal can reacquire the frame number at an early stage.

1 is a diagram showing a configuration example of a radio communication system according to Embodiment 1. FIG. It is a figure explaining the example of the intermittent reception of a user terminal. It is a figure explaining the example of the sleep time of intermittent reception. It is a figure explaining the example of reception of the Paging message of a user terminal. It is the figure which showed the example of a functional block of a wireless base station. It is the figure which showed the example of a functional block of a user terminal. It is a figure explaining the example of the resynchronization process of SFN and HSFN. It is the flowchart which showed the operation example of the radio base station in case the user terminal to which DRX is applied, and the user terminal to which eDRX is applied. It is a figure explaining the example in which a user terminal acquires SFN twice. It is a figure explaining the process example which resynchronizes SFN which concerns on Embodiment 2. FIG. It is a figure explaining another example of processing which resynchronizes SFN. FIG. 10 is a diagram for explaining a processing example for resynchronizing an SFN according to a third embodiment. It is a figure explaining another example of processing which resynchronizes SFN. FIG. 10 is a diagram for describing a processing example for resynchronizing SFN according to the fourth embodiment. It is a figure which shows an example of the hardware constitutions of the radio base station and user terminal which concern on one embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[Embodiment 1]
FIG. 1 is a diagram illustrating a configuration example of a wireless communication system according to the first embodiment. As shown in FIG. 1, the radio communication system includes a radio base station (eNodeB) 1, user terminals (UE: User Equipment) 2 a to 2 c, and a core network 3.

  The radio base station 1 is connected to the core network 3. The core network 3 includes, for example, a host device such as MME (Mobility Management Entity), S-GW (Serving Gateway), or P-GW (Pakcet Data network Gateway). The radio base station 1, for example, supports an extended station that performs radio communication with the user terminals 2 a to 2 c and a BBU (BBU) that controls the extended station so as to correspond to a C-RAN (Centralized Radio Access Network) or an advanced C-RAN. BaseBand processing Unit).

  The user terminals 2a to 2c perform wireless communication with the wireless base station 1. The user terminals 2a to 2c are terminals that perform intermittent reception, for example, MTC terminals such as smart meters or measuring devices. A wireless terminal such as a smartphone or a mobile phone may be located under the wireless base station 1.

  FIG. 2 is a diagram illustrating an example of intermittent reception of the user terminal 2a. FIG. 2 shows the SFN of the radio base station 1 and the SFN of the user terminal 2a.

  The wireless base station 1 and the user terminal 2a can synchronize transmission / reception timings of various signals and perform wireless communication because the SFN is synchronized. For example, as shown in FIG. 2, when the SFNs of the radio base station 1 and the user terminal 2a match and the timing at which the SFN switches matches, the radio base station 1 and the user terminal 2a can perform radio communication. .

  The radio base station 1 receives a Paging message from a higher-level device (for example, MME). The radio base station 1 transmits the received Paging message to the user terminal 2a in the SFN in which the user terminal 2a turns on the radio function. A paging message transmitted from the host device to the radio base station 1 may be referred to as an S1 paging message.

  The user terminal 2a turns off the wireless function during sleep. The user terminal 2a turns on the wireless function in the SFN designated in advance from the host device, and starts the receiving operation of the Paging message.

  For example, it is assumed that “SFN1” and “SFN5” are designated in advance from the host device as the timing at which the user terminal 2a receives the Paging message. In this case, as shown in FIG. 2, the radio base station 1 transmits a Paging message to the user terminal 2a using “SFN1” and “SFN5”.

  The user terminal 2a turns on the radio function and receives the Paging message transmitted from the radio base station 1 at “SFN1” and “SFN5” designated in advance by the host device. As a result, the user terminal 2a is paging (called) from the host device, and can receive, for example, a DL (Down Link) signal.

  Note that the length of 1SFN is 10 ms. SFN numbers are defined from 0 to 1023. The total length of the SFN cycle from “SFN0” to “SFN1023” is 10.24 s.

  In eDRX, HSFN (Hyper SFN) is defined. The HSFN counts the number of rounds of the SFN, and the length of 1HSFN is the length of the SFN cycle (10.24 s). HSFN numbers are defined from 0 to 1023. The total length of HSFN from HSFN0 to HSFN1023 is 174.76 min.

  Moreover, although the intermittent reception of the user terminal 2a was demonstrated in FIG. 2, the user terminals 2b and 2c similarly perform intermittent reception.

  FIG. 3 is a diagram illustrating an example of sleep time for intermittent reception. The user terminals 2a to 2c to which the DRX function or the eDRX function is applied can take, for example, a “Non-DRX state”, a “DRX state”, or an “eDRX state” as illustrated in FIG.

  The user terminals 2a to 2c do not transition to the sleep state when in the “Non-DRX state”. That is, the user terminals 2a to 2c do not turn off the wireless function when in the “Non-DRX state”. The user terminals 2a to 2c receive signals from the radio base station 1 every 1 ms, for example.

  The user terminals 2a to 2c can set a DRX cycle of 320 ms to 5120 ms when in the “DRX state”. The DRX cycle is specified by the host device.

  Cat. 1 user terminal 2a-2c can set the eDRX period of 10.24s-43.69min when it is "eDRX state." The eDRX cycle is specified by the host device.

  Cat. The M or NB (Narrow Band) -IoT user terminals 2a to 2c can set an eDRX cycle of 10.24 s to 174.76 min in the “eDRX state”. The eDRX cycle is specified by the host device.

  As described above, the radio base station 1 and the user terminals 2a to 2c can perform radio communication when the SFN is synchronized. Therefore, the user terminals 2a to 2c cannot receive the Paging message unless the radio base station 1 and the SFN are synchronized. Note that, for example, when the radio base station 1 is restarted due to maintenance or the like and the SFN is reset (for example, reset), the SFN synchronization of the radio base station 1 and the user terminals 2a to 2c may be out of sync.

  FIG. 4 is a diagram illustrating an example of receiving a Paging message of the user terminal 2a. The upper SFN shown in FIG. 4A indicates the SFN of the radio base station 1, and the lower SFN indicates the SFN of the user terminal 2a. Similarly, in each of FIGS. 4B to 4D, the upper SFN indicates the SFN of the radio base station 1, and the lower SFN indicates the SFN of the user terminal 2a.

  FIG. 4A shows an example in which the user terminal 2a cannot receive a Paging message. In FIG. 4A, it is assumed that the user terminal 2a is designated by the higher-level device to receive the Paging message in “SFN1” and “SFN5”.

  It is assumed that the radio base station 1 stops radio wave output for maintenance, for example, at a timing after “SFN1”. Then, it is assumed that the radio base station 1 resumes radio wave output and resets the SFN to “SFN0” upon completion of maintenance.

  In this case, the synchronization of the SFN between the radio base station 1 and the user terminal 2a is shifted after the radio base station 1 resumes the radio wave output. For this reason, the user terminal 2a cannot receive the Paging message after the radio base station 1 resumes the radio wave output.

  For example, the user terminal 2a cancels the sleep state with “SFN5”. However, when the user terminal 2a cancels the sleep state, the SFN of the radio base station 1 is “SFN0”, and no paging message is transmitted from the radio base station 1. For this reason, the user terminal 2a cannot receive the Paging message.

  Further, the radio base station 1 transmits a Paging message with “SFN1” after the radio wave output is resumed. However, since the SFN of the user terminal 2a is “SFN6” and is in the sleep state, the Paging message cannot be received.

  FIG. 4B shows an example in which the user terminal 2a can receive a Paging message. In FIG. 4B, it is assumed that the user terminal 2a is designated to receive a Paging message in “SFN3”.

  It is assumed that the radio base station 1 stops radio wave output for maintenance, for example, at a timing after “SFN1”. Then, it is assumed that the radio base station 1 resumes radio wave output upon completion of maintenance, and resumes SFN from “SFN0”. Further, it is assumed that the user terminal 2a cancels the sleep state (SFN3) while the radio base station 1 stops outputting radio waves.

  In this case, when the user terminal 2a cancels the sleep state, no radio wave is output from the radio base station 1, so that the user terminal 2a determines that the user terminal 2a is out of service and starts a cell reselection process. Then, the user terminal 2a acquires the SFN of the radio base station 1 in the cell reselection process.

  As described above, even if the radio base station 1 stops the radio wave output and resets the SFN after the radio wave output is resumed, the user terminal 2a can restart the radio base station 1 if the user terminal 2a cancels the sleep state while the radio wave output is stopped. SFN after setting can be acquired. Thereby, the user terminal 2a can receive a Paging message.

  FIG. 4C shows an example in which the user terminal 2a can receive a Paging message. In FIG. 4C, it is assumed that the user terminal 2a is designated by the higher-level device to receive the Paging message in “SFN1” and “SFN5”.

  It is assumed that the radio base station 1 stops radio wave output for maintenance, for example, at a timing after “SFN1”. Then, it is assumed that the radio base station 1 resumes radio wave output upon completion of maintenance, and resumes SFN from “SFN0”.

  In FIG. 4C, it is assumed that the switching timing of the SFN of the radio base station 1 after the radio wave output restart and the SFN of the user terminal 2a are shifted. For example, the start point of “SFN0” of the radio base station 1 after the radio wave output is resumed and the start point of “SFN5” of the user terminal 2a are shifted as shown in FIG.

  In this case, the user terminal 2a cancels the sleep state after resuming the radio wave output of the radio base station 1 (SFN5), but the radio wave reception power from the radio base station 1 is low due to the deviation of the start point of the SFN, and the out-of-range determination is performed. Start the cell reselection process. Then, the user terminal 2a acquires the SFN of the radio base station 1 in the cell reselection process.

  Thus, even if the radio base station 1 stops the radio wave output and resets the SFN after resuming the radio wave output, the user terminal 2a resets the radio base station 1 if the start timing of the SFN is shifted. Later SFN can be acquired. Thereby, the user terminal 2a can receive a Paging message.

As described above, the user terminal 2a may not be able to receive the Paging message when the following conditions are met.
1. The radio base station 1 stops radio wave output during the sleep of the user terminal 2a.
2. After the radio wave output is resumed, the SFN switching timings of the radio base station 1 and the user terminal 2a match and the SFNs are different.

  FIG. 4 (d) shows an example of SFN timing that satisfies the condition that the user terminal 2a cannot receive the Paging message. In FIG. 4D, the radio base station 1 stops the radio wave output during the sleep of the user terminal 2a. Further, after the radio wave output of the radio base station 1 is resumed, the leading timings of the SFNs of the radio base station 1 and the user terminal 2a coincide (the timings at which the SFN is switched). Further, after the radio base station 1 resumes radio wave output, the SFNs of the radio base station 1 and the user terminal 2a are different.

  In such a case, the user terminal 2a does not reacquire the SFN by the cell reselection process as described with reference to FIGS. For this reason, the SFNs of the radio base station 1 and the user terminal 2a after the radio wave output is resumed remain different, and the user terminal 2a cannot receive the Paging message.

  Even if the user terminal 2a cannot receive the paging message due to the asynchronous of the SFN, the user terminal 2a can receive the paging message by the stored System Information (hereinafter also referred to as SI). For example, the user terminal 2a can receive a Paging message in order to reacquire the SFN when the expiration date of the held SI expires.

  However, the validity period of SI is long, and it takes time until the user terminal 2a can resume receiving the Paging message. For example, the expiration date of SI of the user terminal 2a to which DRX is applied is 3 hours. Cat. The validity period of the SI of the user terminal 2a to which 1 eDRX is applied is 3 hours. Cat. The validity period of the SI of the user terminal 2a to which M or NB-IoT eDRX is applied is 24 hours.

  Therefore, when the SFN is reset, the radio base station 1 causes the user terminals 2a to 2c to reacquire the SFN at an early stage so that the user terminals 2a to 2c can receive the Paging message at an early stage.

  Further, in next-generation communication systems (for example, 5G and the like), it is expected that MTC by smart meters or measuring devices will also increase, and realization of large-capacity communication is expected. Therefore, the radio base station 1 causes the user terminals 2a to 2c to reacquire SFN at an early stage so as to suppress consumption of radio resources.

  FIG. 5 is a diagram illustrating an example of functional blocks of the radio base station 1. As illustrated in FIG. 5, the radio base station 1 includes an I / F unit 11, a signal processing unit 12, a radio unit 13, and a generation unit 14.

  The I / F unit 11 communicates with a host device included in the core network 3. For example, the I / F unit 11 receives data from the host device and outputs the data to the signal processing unit 12. Further, the I / F unit 11 transmits the data output from the signal processing unit 12 to the host device. For example, the I / F unit 11 performs processing related to a layer higher than a physical layer or a MAC (Medium Access Control) layer.

  The signal processing unit 12 performs baseband processing of the signal. For example, the signal processing unit 12 performs processing such as encoding, modulation, scheduling, precoding, and mapping of data (signal) output from the I / F unit 11. The signal processing unit 12 outputs a baseband processed signal (radio frame) to the radio unit 13.

  In addition, the signal processing unit 12 performs processing such as demapping, channel estimation, pre-filtering, demodulation, and decoding of the signal output from the radio unit 13. The signal processing unit 12 outputs the decoded signal (data) to the I / F unit 11.

  The signal processing unit 12 includes a Paging message generated by the generation unit 14 described later in the radio frame. As will be described in detail below, the signal processing unit 12 includes a Paging message in the radio frame for a predetermined time when the SFN is reset. Further, when resetting the SFN, the signal processing unit 12 notifies the generation unit 14 that the SFN is reset.

  The wireless unit 13 performs wireless transmission processing of the signal output from the signal processing unit 12. For example, the wireless unit 13 performs wireless transmission processing such as D / A conversion, up-conversion, and signal amplification of the signal output from the signal processing unit 12. The signal subjected to the wireless transmission process is transmitted to the user terminals 2a to 2c via an antenna (not shown).

  Moreover, the radio | wireless part 13 performs a radio | wireless reception process with respect to the signal of the user terminals 2a-2c received via the antenna. For example, the radio unit 13 performs radio reception processing such as signal amplification, down-conversion, and A / D conversion on the signals of the user terminals 2a to 2c received by the antenna. The wireless unit 13 outputs the signal subjected to wireless reception processing to the signal processing unit 12.

  When the generation unit 14 receives a notification from the signal processing unit 12 to reset the SFN of the radio frame, the generation unit 14 generates a Paging message instructing acquisition of broadcast information including the SFN. For example, the generation unit 14 generates a SystemInfoModification (hereinafter also referred to as SIM) that instructs acquisition of an MIB (Master Information Block) or SIB (System Information Block) including the SFN, and generates a Paging message including the SIM. To do. The generation unit 14 outputs the generated Paging message to the signal processing unit 12.

  Note that the notification information may include HSFN. When the user terminals 2a to 2c are terminals to which eDRX is applied, the generation unit 14 generates SystemInfoModification-eDRX (hereinafter sometimes referred to as SIM-eDRX), and generates a Paging message including SIM-eDRX. .

  FIG. 6 is a diagram illustrating an example of functional blocks of the user terminal 2a. As illustrated in FIG. 6, the user terminal 2 a includes a wireless unit 21, a signal processing unit 22, and a control unit 23. Since the user terminals 2b and 2c have the same blocks as the user terminal 2a, the description thereof is omitted.

  The radio unit 21 performs radio reception processing on the signal of the radio base station 1 received via an antenna (not shown). For example, the radio unit 21 performs radio reception processing such as signal amplification, down-conversion, and A / D conversion on the signal of the radio base station 1 received by the antenna. The wireless unit 21 outputs the signal subjected to wireless reception processing to the signal processing unit 22.

  The radio unit 21 performs radio transmission processing such as D / A conversion, up-conversion, and signal amplification of the signal output from the signal processing unit 22. The signal subjected to the radio transmission processing is transmitted to the radio base station 1 via the antenna.

  The signal processing unit 22 performs baseband processing of the signal. For example, the signal processing unit 22 performs processing such as demapping, demodulation, channel estimation, and decoding of the signal output from the radio unit 21. The signal processing unit 22 outputs the decoded signal (data) to an application unit (not shown).

  The signal processing unit 22 performs processing such as encoding, modulation, and mapping of data output from the application unit. The signal processing unit 22 outputs a baseband processed signal (radio frame) to the radio unit 21.

  The control unit 23 performs on / off control of power supplied to the radio unit 21 and the signal processing unit 22. For example, the control unit 23 turns on the power supply to the radio unit 21 and the signal processing unit 22 (releases the sleep state) in the SFN designated by the host device. On the other hand, the control unit 23 turns off the power supply to the radio unit 21 and the signal processing unit 22 in the SFN other than the SFN designated by the host device (sets the sleep state).

  FIG. 7 is a diagram illustrating an example of resynchronization processing of SFN and HSFN. FIG. 7 shows the SFN of the radio base station 1 and the SFN of the user terminal 2a to which eDRX is applied. It is assumed that the user terminal 2a is designated by the host device to receive the Paging message in “SFN2 to SFN4”. Below, although the user terminal 2a is demonstrated, it is the same also about the user terminals 2b and 2c.

  For example, it is assumed that the radio unit 13 of the radio base station 1 stops the radio wave output for maintenance, and then resumes the radio wave output when the maintenance ends. In this case, as indicated by an arrow A1 in FIG. 7, the signal processing unit 12 resets SFN and HSFN (HSFN is not shown) after restarting radio wave output, and starts SFN from, for example, “SFN0”.

  The generation unit 14 generates SIM-eDRX instructing acquisition of broadcast information including SFN and HSFN by resetting SFN and HSFN, and generates a Paging message including SIM-eDRX. The signal processing unit 12 includes the Paging message generated by the generation unit 14 in each radio frame and transmits it to the user terminal 2a for a predetermined time. For example, as shown by the arrow group A2 in FIG. 7, the signal processing unit 12 transmits the Paging message generated by the generation unit 14 to the user terminal 2a in each SFN for a predetermined time.

  After the radio wave output is resumed, the predetermined time for the signal processing unit 12 to transmit the Paging message to the user terminal 2a is the longest period of the eDRX period that can be set in the user terminal 2a. For example, the “maximum eDRX cycle” illustrated in FIG. 7 indicates the longest period of the eDRX cycle that can be set in the user terminal 2a. The signal processing unit 12 transmits a paging message including SIM-eDRX to the user terminal 2a in each SFN during the “maximum eDRX cycle” illustrated in FIG.

  For example, if the user terminal 2a is Cat. In the case of one eDRX terminal, the maximum eDRX cycle that can be set in the user terminal 2a is 43.69 min (see FIG. 3). In this case, the signal processing unit 12 transmits a Paging message including SIM-eDRX to the user terminal 2a in each SFN for 43.69 min after the radio wave output is resumed.

  Further, the user terminal 2a is connected to the Cat. In the case of M or NB-IoT eDRX terminals, the maximum eDRX cycle that can be set in the user terminal 2a is 174.76 min (see FIG. 3). In this case, the signal processing unit 12 transmits a Paging message including SIM-eDRX to the user terminal 2a in each SFN for 174.76 min after the radio wave output is resumed.

  Thus, as indicated by the arrow group A2, the radio base station 1 transmits a paging message including SIM-eDRX to the user terminal 2a in each SFN after resuming radio wave output. Therefore, the user terminal 2a can receive the Paging message including SIM-eDRX when the sleep state is canceled. For example, the user terminal 2a can receive a Paging message including SIM-eDRX at the timing indicated by the arrow A3 in FIG.

  The SIM-eDRX of the Paging message received by the user terminal 2a instructs to receive broadcast information including SFN and HSFN. For example, the SIM-eDRX of the Paging message instructs to receive broadcast information including SFN and HSFN at the next “HSFN mod 256 = 0” timing (start point of eDRX acquisition period). As a result, after receiving the Paging message including the SIM-eDRX, the user terminal 2a broadcasts the SFN and the HSFN at the first timing of any one of “HSFN0”, “HSFN256”, “HSFN512”, and “HSFN768”. Receive information.

  The timing A4 shown in FIG. 7 indicates the timing of the first “HSFN mod 256 = 0” after the user terminal 2a receives the Paging message. The wireless unit 21 of the user terminal 2a cancels the sleep state at timing A4 and receives notification information. In addition, the longest time until the user terminal 2a cancels the sleep state and receives the notification information is 43.69 min.

  When the signal processing unit 22 of the user terminal 2a receives broadcast information including SFN and HSFN from the radio base station 1, the signal processing unit 22 synchronizes its own SFN and HSFN with the received SFN and HSFN. In addition, the radio | wireless part 22 of the user terminal 2a returns to a sleep state after the synchronization of SFN and HSFN.

  The user terminal 2a can appropriately receive the Paging message after synchronizing the SFN and the HSFN. For example, after timing A4 in FIG. 7, the SFN and HSFN of the radio base station 1 and the user terminal 2a are synchronized. Therefore, the user terminal 2a can appropriately receive the Paging message from the radio base station 1, as indicated by an arrow A5 in FIG.

  After the radio base station 1 resumes radio wave output, the user terminal 2a receives a SIM-eDRX Paging message at least within the maximum eDRX cycle time. Then, after receiving the Paging message, the user terminal 2a receives the broadcast information at the timing of “HSFN mod 256 = 0”. Thereby, the user terminal 2a can acquire SFN and HSFN at an early stage.

  For example, Cat. The user terminal 2a to which 1 eDRX is applied receives the SIM-eDRX Paging message at least within “43.96 min” (see FIG. 3) after the radio base station 1 resumes radio wave output. Then, after receiving the Paging message, the user terminal 2a receives the broadcast information at a timing of “HSFN mod 256 = 0” (maximum 43.69 min).

  In addition, Cat. The user terminal 2a to which the eDRX of M or NB-IoT is applied receives the SIM-eDRX Paging message at least within “174.76 min” (see FIG. 3) after the radio base station 1 resumes the radio wave output. To do. Then, after receiving the Paging message, the user terminal 2a receives the broadcast information at a timing of “HSFN mod 256 = 0” (maximum 43.69 min). Thus, the user terminal 2a can acquire SFN and HSFN at an early stage.

  As described above, the signal processing unit 12 of the radio base station 1 generates a radio frame, and the radio unit 13 transmits the generated radio frame to the user terminals 2a to 2c through radio communication. The generation unit 14 generates a Paging message including SIM-eDRX. When the SFN and HSFN are reset, the signal processing unit 12 includes the Paging message generated by the generating unit 14 in each radio frame for a predetermined time after the resetting. Thereby, when the radio base station 1 resets the SFN and the HSFN, the user terminals 2a to 2c can reacquire the SFN and the HSFN at an early stage.

  In addition, when the SFN and HSFN are reset, the radio base station 1 transmits a paging message including SIM-eDRX for a predetermined time after the resetting, and then transmits a paging message including SIM-eDRX to the user terminals 2a to 2c. Do not send. Thereby, the radio base station 1 can suppress the consumption of radio resources due to the Paging message including SIM-eDRX.

[Modification 1]
In the above, the signal processing unit 12 of the radio base station 1 transmits a Paging message including SIM-eDRx, the longest period of the eDRX period that can be set in the user terminal 2a after the radio wave output is resumed. However, the signal processing unit 12 may transmit the paging message to the user terminals 2a to 2c for the longest period of the eDRX periods set in the user terminals 2a to 2c located in the area.

  For example, the eDRX cycle set in the user terminal 2a is “T1”, the eDRX cycle set in the user terminal 2b is “T2”, and the eDRX cycle set in the user terminal 2c is “T3”. Further, it is assumed that “T1 <T2 <T3”.

  In this case, the signal processing unit 12 acquires “T3” as the time of the longest period among the eDRX periods set in the user terminals 2a to 2c located in the area. Then, after the radio wave output is resumed, the signal processing unit 12 transmits a Paging message including SIM-eDRx to the user terminals 2a to 2c in each SFN for a time T3.

  Thereby, the radio base station 1 can cause the user terminals 2a to 2c to reacquire SFN and HSFN at an early stage. Further, the radio base station 1 can suppress consumption of radio resources due to the Paging message including SIM-eDRX.

  Note that the signal processing unit 12 may determine the maximum value of the next IE (Information Element) included in the S1Paging message received from the host device and store the maximum value in the storage device.

・ Paging eDRX Cycle
The IE indicates an eDRX cycle in which a Paging message is transmitted. As a result, the signal processing unit 12 refers to the storage device that stores the maximum value of “Paging eDRX Cycle”, so that the longest cycle among the eDRX cycles set in the user terminals 2a to 2c that are in the area. Can get the time.

  When the IE paging message has never been transmitted to the user terminals 2a to 2c having the longest eDRX cycle during operation of the radio base station 1, the user terminals 2a to 2c having the longest eDRX cycle have been sent. There is a case where the eDRX cycle is not stored in the storage device. For this reason, the transmission time of the Paging message including SIM-eDRx is insufficient for the user terminals 2a to 2c having the longest eDRX cycle, and the Paging message including SIM-eDRX may not be received. In this case, the user terminals 2a to 2c having the longest eDRX cycle synchronize SFN and HSFN based on the expiration date of SI (although it takes time to synchronize SFN and HSFN), the radio base station Since the user terminals 2a to 2c have never transmitted the Paging message during the operation of the service 1, the service influence is small.

  Further, the radio base station 1 receives the longest cycle time among the eDRX cycles set in the user terminals 2a to 2c in the area from the host device (for example, the MME) that manages the eDRX cycle, You may memorize | store in a memory | storage device. Further, the operator may store the time of the longest cycle among the eDRX cycles set in the user terminals 2a to 2c in the area in the storage device of the radio base station 1.

[Modification 2]
In the second modification, the signal processing unit 12 of the radio base station 1 first acquires the time of the longest cycle among the eDRX cycles set in the user terminals 2a to 2c in the same area as in the first modification. To do. Then, the signal processing unit 12 transmits a paging message including the difference between the acquired eDRX cycle and the radio wave suspension time, and SIM-eDRx.

  For example, the signal processing unit 12 subtracts the time when the wireless unit 13 stopped the radio wave output from the acquired longest eDRX cycle. Then, the signal processing unit 12 transmits a Paging message including SIM-eDRx, the time obtained by subtraction, to the user terminals 2a to 2c.

  Also by this, the radio base station 1 can cause the user terminals 2a to 2c to reacquire SFN and HSFN at an early stage. Further, the radio base station 1 can suppress consumption of radio resources due to the Paging message including SIM-eDRX.

[Modification 3]
In FIG. 7 and Modifications 1 and 2, the case of eDRX has been described as an example, but the same applies to the case of DRX. However, in the case of DRX, the generation unit 14 generates a Paging message including a SIM. Then, the signal processing unit 12 transmits the generated Paging message in each SFN for a predetermined time.

  When receiving the Paging message including the SIM from the radio base station 1, the user terminal 2a receives the broadcast information including the SFN at the next "SFN0" timing. After the radio wave output is resumed, the maximum time until the user terminal 2a receives the broadcast information including the SFN is “10.24s”. In addition, the transmission time for transmitting the Paging message including the SIM of the radio base station 1 is “5120 ms” (see FIG. 3).

  In the first modification, the signal processing unit 12 determines the maximum value of “Paging eDRX Cycle”. However, in the case of DRX, the signal processing unit 12 determines the maximum value of “Paging DRX”.

[Modification 4]
A user terminal to which DRX is applied and a user terminal to which eDRX is applied may be located under the radio base station 1. Hereinafter, an operation example of the radio base station 1 in this case will be described.

  FIG. 8 is a flowchart illustrating an operation example of the radio base station 1 when a user terminal to which DRX is applied and a user terminal to which eDRX is applied exist. For example, the radio base station 1 executes the following processing while radio wave output is stopped.

  First, the generation unit 14 generates a SIM (step S1).

  Next, the generation unit 14 sets the SIM generated in Step S1 to the IE of the Paging message (Step S2).

  Next, the signal processing unit 12 determines the SIM transmission time (step S3). Note that, as described above, the SIM transmission time may be the maximum DRX cycle time (5120 ms) after resuming radio wave output, or among the DRX cycles set in the DRX user terminals in the area, It may be the longest cycle time. Also, the SIM transmission time may be the difference between the longest period of the DRX period set in the DRX user terminal in the area and the radio wave suspension time.

  Next, the signal processing unit 12 determines whether or not the eDRX service is being performed (step S4). When the eDRX service is not being performed (No), the signal processing unit 12 ends the process of the flowchart.

  When it is determined that the eDRX service is being performed (Yes), the generation unit 14 generates a SIM-eDRX (step S5).

  Next, the generation unit 14 sets the SIM-eDRX generated in step S5 to the IE of the Paging message (step S6).

  Next, the signal processing unit 12 determines the transmission time of SIM-eDRX (step S7). Then, the signal processing unit 12 ends the process of the flowchart. Note that, as described above, the transmission time of SIM-eDRX is the maximum time of eDRX cycle after resuming radio wave output (“43.69 min” for Cat.1 eDRX, “174 for Cat.M or NB-IoT” .76 min ") or the longest period of eDRX periods set in the eDRX user terminal in the area. Also, the SIM transmission time may be the difference between the longest period of eDRX periods set in the eDRX user terminals in the area and the radio wave suspension time.

  The signal processing unit 12 includes the Paging message generated in steps S2 and S6 in the radio frame of each SFN after the radio wave output is resumed. At that time, the signal processing unit 12 includes the Paging message in the radio frame of each SFN and the transmission time determined in steps S3 and S7.

[Embodiment 2]
When the radio base station 1 transmits a Paging message including SIM-eDRX across “HSFN mod 256 = 0”, the user terminals 2a to 2c can acquire (receive) SFN and HSFN only once. It may be performed twice and consumes power. In the second embodiment, the acquisition of SFN and HSFN of the user terminals 2a to 2c is performed once to suppress power consumption. Below, a different part from Embodiment 1 is demonstrated.

  FIG. 9 is a diagram illustrating an example in which the user terminal acquires SFN twice. In FIG. 9, HSFN of the radio base station, Cat. 1 shows HSFN of a user terminal to which eDRX of 1 is applied.

  9 indicates the timing when the radio base station resets SFN (SFN not shown) and HSFN. The radio base station transmits a Paging message including SIM-eDRX to the user terminal for a predetermined time indicated by a double arrow A12 after the SFN and HSFN are reset. The user terminal receives a Paging message including SIM-eDRX from the radio base station at the timings indicated by arrows A13 and A15.

  The user terminal acquires broadcast information including SFN and HSFN in the next “HSFN mod 256 = 0” by receiving a Paging message including SIM-eDRX at the timing indicated by arrow A13. For example, the user terminal acquires broadcast information including SFN and HSFN at timing A14 shown in FIG.

  Also, the user terminal acquires broadcast information including SFN and HSFN in the next “HSFN mod 256 = 0” by receiving a Paging message including SIM-eDRX at the timing indicated by arrow A15. For example, the user terminal acquires broadcast information including SFN and HSFN at timing A16 illustrated in FIG.

  As described above, when the transmission of the Paging message including the SIM-eDRX of the radio base station 1 straddles “HSFN mod 256 = 0”, the user terminal may acquire SFN and HSFN twice.

  Therefore, the radio base station 1 uses the transmission time of the Paging message including SIM-eDRX as the transmission time described in the first embodiment, but when the HSFN just before “HSFN mod 256 = 0” is reached. At that time, transmission of the Paging message is stopped.

  FIG. 10 is a diagram for explaining a processing example for resynchronizing the SFN according to the second embodiment. FIG. 10 shows the HSFN of the radio base station 1. A hatched portion A21 shown in FIG. 10 indicates timing when the signal processing unit 12 of the radio base station 1 resets SFN and HSFN.

  User terminals 2a to 2c residing in the radio base station 1 receive Cat. In the case of 1, the signal processing unit 12 transmits a Paging message including SIM-eDRX to the user terminal for 43.69 min after resetting the SFN and the HSFN. However, as described above, the signal processing unit 12 transmits the Paging message including the SIM-eDRX to the HSFN immediately before “HSFN mod 256 = 0” to the user terminal.

  In the example of FIG. 10, HSFN becomes “HSFN255” before 43.69 min elapses. Therefore, the signal processing unit 12 stops the transmission of the Paging message before the time of 43.69 min elapses after the SFN and HSFN are reset.

  If the transmission of the Paging message is stopped before the time of 43.69 min elapses, there are user terminals 2a to 2c that cannot receive the Paging message. In this case, the user terminals 2a to 2c that have not received the Paging message synchronize the SFN and the HSFN when the expiration date of the SI expires (for example, after 3 hours).

  As described above, the signal processing unit 12 sets the transmission time of the Paging message including the SIM-eDRX to be transmitted after the reconfiguration of the SFN and the HSFN even before the transmission time described in the first embodiment has elapsed. HSFN mod 256 = 0 ”until HSFN immediately before. Thereby, user terminal 2a-2c can receive the alerting | reporting information containing SFN and HSFN once, and can suppress power consumption.

[Modification 1]
The radio base station 1 may transmit a Paging message including SIM-eDRX to the user terminals 2a to 2c from the timing of “HSFN mod 256 = 0” after the reconfiguration of the SFN and the HSFN.

  FIG. 11 is a diagram illustrating another example of processing for resynchronizing the SFN. FIG. 11 shows the HSFN of the radio base station 1.

  11 indicates the timing when the signal processing unit 12 of the radio base station 1 resets SFN and HSFN. After resetting SFN and HSFN (after resetting to HSFN100), the signal processing unit 12 first starts the HSFN 256 where “HSFN mod 256 = 0”, and then includes a paging message including SIM-eDRX for a predetermined time indicated by a double arrow A32. Is transmitted to the user terminal.

  As described above, the signal processing unit 12 starts from the HSFN (HSFN 256 in FIG. 11) that first becomes “HSFN mod 256 = 0” after the resetting of the SFN and the HSFN, the transmission time and the SIM described in the first embodiment. -A Paging message including eDRX may be transmitted to the user terminal. Also by this, user terminal 2a-2c can receive broadcast information including SFN and HSFN once, and can control power consumption.

  Note that the user terminals 2a to 2c cannot synchronize the SFN and the HSFN until at least transmission of a Paging message including SIM-eDRX is started from the radio base station 1. For example, the user terminals 2a to 2c cannot synchronize SFN and HSFN between the double arrows A33 shown in FIG. This time is “43.69 min” at the longest.

[Embodiment 3]
In Embodiment 1, the radio base station 1 transmits a Paging message including SIM-eDRX for a predetermined time after the reconfiguration of the SFN and the HSFN. In the third embodiment, a Paging message including SIM-eDRX is transmitted for a predetermined time before resetting SFN and HSFN. Below, a different part from Embodiment 1 is demonstrated.

  FIG. 12 is a diagram for explaining a processing example for resynchronizing the SFN according to the third embodiment. FIG. 12 shows the SFN of the radio base station 1 and the SFN of the user terminal 2a to which eDRX is applied. It is assumed that the user terminal 2a is designated by the higher-level device to receive the Paging message in “SFN5 to SFN7”.

  The generation unit 14 generates SIM-eDRX instructing acquisition of broadcast information including SFN and HSFN before the signal processing unit 12 resets the SFN and HSFN (HSFN not shown) of the radio frame. And the production | generation part 14 produces | generates the Paging message containing SIM-eDRX.

  The signal processing unit 12 includes a Paging message including the SIM-eDRX generated by the generation unit 14 in a radio frame and transmits it to the user terminal 2a from a predetermined time before resetting the SFN and HSFN.

  For example, it is assumed that the radio unit 13 stops the radio wave output for maintenance from the timing indicated by the arrow A41. In this case, the signal processing unit 12 includes the Paging message including the SIM-eDRX generated by the generation unit 14 in the radio frame before the maximum eDRX cycle illustrated in FIG. 12 from the timing indicated by the arrow A41, to the user terminal 2a. Send.

  The maximum eDRX cycle shown in FIG. 12 is the longest cycle time of eDRX cycles that can be set in the user terminal 2a. For example, if the user terminal 2a is Cat. In the case of one eDRX terminal, the maximum eDRX cycle that can be set in the user terminal 2a is 43.69 min (see FIG. 3). If the user terminal 2a is Cat. In the case of an MDR or NB-IoT eDRX terminal, the maximum eDRX cycle that can be set in the user terminal 2a is “174.76 min” (see FIG. 3).

  As described above, the radio base station 1 transmits a Paging message including SIM-eDRX to the user terminal 2a in each SFN before the radio wave output is stopped, as indicated by an arrow group A42. Therefore, the user terminal 2a can receive the Paging message including SIM-eDRX when the sleep state is canceled before the radio wave output is stopped. For example, the user terminal 2a can receive a Paging message including SIM-eDRX at a timing indicated by an arrow A43 in FIG.

  The SIM-eDRX of the Paging message received by the user terminal 2a instructs to receive broadcast information including SFN and HSFN. For example, the SIM-eDRX of the Paging message instructs to receive broadcast information including SFN and HSFN at the next timing of “HSFN mod 256 = 0”. As a result, after receiving the Paging message including the SIM-eDRX, the user terminal 2a broadcasts the SFN and the HSFN at the first timing of any one of “HSFN0”, “HSFN256”, “HSFN512”, and “HSFN768”. Receive information.

  A timing A44 illustrated in FIG. 12 indicates the timing of the first “HSFN mod 256 = 0” after the user terminal 2a receives the Paging message. The radio | wireless part 21 of the user terminal 2a cancels | releases a sleep state in timing A44, and receives alerting | reporting information.

  When the signal processing unit 22 of the user terminal 2a receives broadcast information including SFN and HSFN from the radio base station 1, the signal processing unit 22 synchronizes its own SFN and HSFN with the received SFN and HSFN. In addition, the radio | wireless part 22 of the user terminal 2a returns to a sleep state after the synchronization of SFN and HSFN.

  The user terminal 2a can appropriately receive the Paging message after synchronizing the SFN and the HSFN. For example, after timing A44 in FIG. 12, the SFN and HSFN of the radio base station 1 and the user terminal 2a are synchronized. Therefore, the user terminal 2a can appropriately receive the Paging message from the radio base station 1, as indicated by an arrow A45 in FIG.

  In this way, the user terminal 2a can synchronize SFN and HSFN even after the radio base station 1 stops radio wave output (even after resetting SFN and HSFN). Moreover, since the radio base station 1 should just transmit the Paging message containing SIM-eDRX from the maximum eDRX period before a radio wave output is stopped, it can suppress consumption of a radio | wireless resource.

  When the timing of “HSFN mod 256 = 0” at which the user terminal 2a receives broadcast information, the radio base station 1 may stop radio wave output. Even in this case, the user terminal 2a can synchronize the radio base station 1 with the SFN and HSFN.

  FIG. 13 is a diagram illustrating another example of processing for resynchronizing the SFN. In FIG. 13, the timing of receiving the notification information of the user terminal 2a is different from that in FIG. For example, the timing (HSFN mod 256 = 0) for receiving the notification information of the user terminal 2a shown in the timing A51 of FIG.

  In this case, since the user terminal 2a receives broadcast information, when the sleep state is canceled, the radio base station 1 does not output radio waves when canceling the sleep state. (It corresponds to the state of (b)). Thereby, the user terminal 2a can acquire the SFN and HSFN of the radio base station 1 in the cell reselection process, and can synchronize with the SFN and HSFN of the radio base station 1. Therefore, the user terminal 2a can appropriately receive the Paging message from the radio base station 1 as indicated by the arrow A45 when the sleep state is canceled after the radio wave output is resumed.

  As described above, when the SFN and the HSFN are reset, the signal processing unit 12 of the radio base station 1 includes the Paging message generated by the generating unit 14 in each radio frame for a predetermined time before resetting. Thereby, when the radio base station 1 resets the SFN and the HSFN, the user terminals 2a to 2c can reacquire the SFN and the HSFN at an early stage.

  In addition, when the SFN and the HSFN are reset, the radio base station 1 transmits a paging message including SIM-eDRX for a predetermined time before resetting, and before that, the paging message including SIM-eDRX is transmitted to the user terminal. Do not transmit to 2a-2c. Thereby, the radio base station 1 can suppress the consumption of radio resources due to the Paging message including SIM-eDRX.

  In the above description, the signal processing unit 12 transmits a Paging message including the maximum eDRX cycle time and SIM-eDRx before the radio wave output is stopped. However, as in the first modification of the first embodiment, the signal processing unit 12 has the longest cycle time among the eDRX cycles set in the user terminals 2a to 2c in the area before the radio wave output is stopped. A Paging message including SIM-eDRX may be transmitted.

  Similarly to the second modification of the first embodiment, the signal processing unit 12 sends a paging message including the difference between the maximum time of the eDRX cycle and the radio wave stop time and SIM-eDRx before the radio wave output is stopped. You may send it.

  In the above description, eDRX has been described as an example, but the same applies to DRX. However, in the case of DRX, the user terminal 2a receives a Paging message including a SIM from the radio base station 1. When receiving the Paging message including the SIM from the radio base station 1, the user terminal 2a receives the broadcast information including the SFN at the next "SFN0" timing.

  Further, the radio base station 1 may stop radio wave output when the user terminal 2a acquires the broadcast information. For example, as shown in FIG. 13, the radio wave output may be stopped at the time of an arrow A51.

[Embodiment 4]
In Embodiment 4, the radio wave output period of the radio base station is made longer than the eDRX cycle of the user terminal. As a result, when the user terminal cancels the sleep state, the radio base station has low radio wave reception power, so the user terminal performs cell reselection processing and receives SFN and HSFN from the radio base station.

  FIG. 14 is a diagram for explaining a processing example for resynchronizing the SFN according to the fourth embodiment. As shown in FIG. 14, the radio unit 13 of the radio base station 1 stops the radio wave output for a time longer than the eDRX cycle of the user terminal 2a. It is assumed that the user terminal 2a is designated by the host device to receive the Paging message in “SFN10 to SFN12”.

  In this case, the user terminal 2 a cancels the sleep state while the radio base station 1 stops outputting radio waves. When the user terminal 2a cancels the sleep state while the radio base station 1 stops the radio wave output, the radio base station 1 has low radio wave reception power, and therefore performs a cell reselection process. Receive.

  As described above, the radio base station 1 stops radio wave output for longer than the eDRX cycle set in the user terminals 2a to 2b. Thereby, when the SFN and HSFN are reset, the radio base station 1 can cause the user terminals 2a to 2c to reacquire SFN at an early stage. Moreover, since the radio base station 1 does not transmit a Paging message including SIM-eDRX, it is possible to suppress consumption of radio resources due to the Paging message including SIM-eDRX. Further, the radio base station 1 and the user terminals 2a to 2c can synchronize the SFN and the HSFN with a simple process.

  In addition, although the user terminal 2a to which eDRX is applied has been described above, the same applies to a user terminal to which DRX is applied. In this case, the radio base station 1 stops the radio wave output for longer than the DRX cycle of the user terminal.

  Moreover, the period of the eDRX period set in the user terminals 2a to 2b can be acquired by the method described in [Modification 1] of the first embodiment.

  Further, the radio base station 1 may stop radio wave output for a maximum eDRX cycle time that can be set in the user terminals 2a to 2b.

  In addition, the radio base station 1 includes a receiving unit that receives information instructing to stop radio wave output from the host device. When the reception unit receives information instructing to stop the radio wave output, the radio unit 13 stops the radio wave output for a time (predetermined time) longer than the eDRX cycle of the user terminal. The wireless unit 13 resumes radio wave output when a predetermined time has elapsed.

  The embodiments have been described above. In the above description, the radio base station 1 transmits a paging message instructing to receive broadcast information to the user terminals 2a to 2c. However, the radio base station 1 transmits a system InfoValueTag transmitted as an information element in the SIB1. The value of may be updated.

(Hardware configuration)
The block diagram used in the description of the above embodiment shows functional unit blocks. These functional blocks (components) are realized by any combination of hardware and / or software. Further, the means for realizing each functional block is not particularly limited. That is, each functional block may be realized by one device physically and / or logically coupled, and two or more devices physically and / or logically separated may be directly and / or indirectly. (For example, wired and / or wireless) and may be realized by these plural devices.

  For example, the radio base station and the user terminal in an embodiment of the present invention may function as a computer that performs the processing of the present invention. FIG. 15 is a diagram illustrating an example of a hardware configuration of a radio base station and a user terminal according to an embodiment of the present invention. The above-described radio base station and user terminal 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 configurations of the radio base station and the user terminal may be configured to include one or a plurality of devices illustrated in the figure, or may be configured not to include some devices.

  For example, although only one processor 1001 is shown, there may be a plurality of processors. Further, the processing may be executed by one processor, or the processing may be executed by one or more processors simultaneously, sequentially, or in another manner. Note that the processor 1001 may be implemented by one or more chips.

  Each function in the radio base station and the user terminal reads predetermined software (program) on hardware such as the processor 1001 and the memory 1002 so that the processor 1001 performs computation and performs communication by the communication device 1004 or memory. This is realized by controlling data reading and / or writing in the storage 1003 and the storage 1003.

  For example, the processor 1001 controls the entire computer by operating an operating system. The processor 1001 may be configured by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, and the like. For example, the above block example may be realized by the processor 1001.

  In addition, the processor 1001 reads a program (program code), software module, or data from the storage 1003 and / or 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 operations described in the above embodiments is used. For example, at least some of the functional blocks constituting the radio base station and the user terminal may be realized by a control program stored in the memory 1002 and operated by the processor 1001, and may be realized similarly for other functional blocks. Also good. Although the above-described various processes have been described as being executed by one processor 1001, they may be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. Note that the program may be transmitted from a network via a telecommunication line.

  The memory 1002 is a computer-readable recording medium and includes, for example, at least one of ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), RAM (Random Access Memory), and the like. May be. 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 the embodiment of the present invention.

  The storage 1003 is a computer-readable recording medium, such as an optical disc such as a CD-ROM (Compact Disc ROM), a hard disc drive, a flexible disc, a magneto-optical disc (eg, a compact disc, a digital versatile disc, a Blu-ray). (Registered trademark) disk, smart card, flash memory (for example, card, stick, key drive), floppy (registered trademark) disk, magnetic strip, and the like. The storage 1003 may be referred to as an auxiliary storage device. The storage medium described above may be, for example, a database, server, or other suitable medium including the memory 1002 and / or the storage 1003.

  The communication device 1004 is hardware (transmission / reception device) for performing communication between computers via a wired and / or wireless network, and is also referred to as a network device, a network controller, a network card, a communication module, or the like.

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

  Each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured with a single bus or may be configured with different buses between apparatuses.

  The radio base station and the user terminal include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), and a field programmable gate array (FPGA). And a part or all of each functional block may be realized by the hardware. For example, the processor 1001 may be implemented by at least one of these hardware.

(Information notification, signaling)
The notification of information is not limited to the aspect / embodiment described in the present specification, and may be performed by other methods. For example, information notification includes physical layer signaling (for example, DCI (Downlink Control Information), UCI (Uplink Control Information)), upper layer signaling (for example, RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling), It may be implemented by broadcast information (MIB (Master Information Block), SIB (System Information Block))), other signals, or a combination thereof. The RRC signaling may be referred to as an RRC message, and may be, for example, an RRC connection setup message, an RRC connection reconfiguration message, or the like.

(Adaptive system)
Each aspect / embodiment described herein includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G, 5G, FRA (Future Radio Access), W-CDMA. (Registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (Registered trademark), a system using another appropriate system, and / or a next generation system extended based on the system may be applied.

(Processing procedure etc.)
As long as there is no contradiction, the order of the processing procedures, sequences, flowcharts, and the like of each aspect / embodiment described in this specification may be changed. For example, the methods described herein present the elements of the various steps in an exemplary order and are not limited to the specific order presented.

(Operation of base station)
The specific operation assumed to be performed by the base station (radio base station) in this specification may be performed by the upper node in some cases. In a network composed of one or more network nodes having a base station, various operations performed for communication with a terminal may be performed by the base station and / or other network nodes other than the base station (e.g., It is obvious that this can be performed by MME (Mobility Management Entity) or S-GW (Serving Gateway), but not limited thereto. Although the case where there is one network node other than the base station in the above is illustrated, a combination of a plurality of other network nodes (for example, MME and S-GW) may be used.

(I / O direction)
Information, signals, and the like can be output from the upper layer (or lower layer) to the lower layer (or upper layer). Input / output may be performed via a plurality of network nodes.

(Handling of input / output information, etc.)
Input / output information and the like may be stored in a specific location (for example, a memory) or may be managed by a management table. Input / output information and the like can be overwritten, updated, or additionally written. The output information or the like may be deleted. The input information or the like may be transmitted to another device.

(Judgment method)
The determination may be performed by a value represented by 1 bit (0 or 1), may be performed by a true / false value (Boolean: true or false), or may be performed by comparing numerical values (for example, a predetermined value) Comparison with the value).

(software)
Software, whether it is called software, firmware, middleware, microcode, hardware description language, or other names, instructions, instruction sets, codes, code segments, program codes, programs, subprograms, software modules , Applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc. should be interpreted broadly.

  Also, software, instructions, etc. may be transmitted / received via a transmission medium. For example, software may use websites, servers, or other devices using wired technology such as coaxial cable, fiber optic cable, twisted pair and digital subscriber line (DSL) and / or wireless technology such as infrared, wireless and microwave. When transmitted from a remote source, these wired and / or wireless technologies are included within the definition of transmission media.

(Information, signal)
Information, signals, etc. described herein may be represented using any of a variety of different technologies. For example, data, commands, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description are voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these May be represented by a combination of

  Note that the terms described in this specification and / or terms necessary for understanding this specification may be replaced with terms having the same or similar meaning. For example, the channel and / or symbol may be a signal. The signal may be a message. Further, the component carrier (CC) may be called a carrier frequency, a cell, or the like.

("System", [Network])
As used herein, the terms “system” and “network” are used interchangeably.

(Parameter, channel name)
In addition, information, parameters, and the like described in this specification may be represented by absolute values, may be represented by relative values from a predetermined value, or may be represented by other corresponding information. . For example, the radio resource may be indicated by an index.

  The names used for the parameters described above are not limiting in any way. Further, mathematical formulas and the like that use these parameters may differ from those explicitly disclosed herein. Since various channels (eg, PUCCH, PDCCH, etc.) and information elements (eg, TPC, etc.) can be identified by any suitable name, the various names assigned to these various channels and information elements are However, it is not limited.

(base station)
A base station (radio base station) can accommodate one or more (eg, three) cells (also referred to as sectors). When 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, indoor small base station RRH: Remote Radio Head) can also provide communication services. The term “cell” or “sector” refers to part or all of the coverage area of a base station and / or base station subsystem that provides communication services in this coverage. Further, the terms “base station”, “eNB”, “cell”, and “sector” may be used interchangeably herein. A base station may also be referred to in terms such as a fixed station, NodeB, eNodeB (eNB), access point, femtocell, small cell, and the like.

(Terminal)
A user terminal is a mobile station, 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 by a person skilled in the art It may also be referred to as a terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, UE (User Equipment), or some other appropriate terminology.

(Meaning and interpretation of terms)
As used herein, the terms “determining” and “determining” may encompass a wide variety of actions. “Judgment” and “determination” are, for example, judgment, calculation, calculation, processing, derivation, investigating, looking up (eg, table , Searching in a database or another data structure), considering ascertaining as “determining”, “deciding”, and the like. In addition, “determination” and “determination” include receiving (for example, receiving information), transmitting (for example, transmitting information), input (input), output (output), and access. (accessing) (e.g., accessing data in a memory) may be considered as "determined" or "determined". In addition, “determination” and “decision” means that “resolving”, “selecting”, “choosing”, “establishing”, and “comparing” are regarded as “determining” and “deciding”. May be included. In other words, “determination” and “determination” may include considering some operation as “determination” and “determination”.

  The terms “connected”, “coupled”, or any variation thereof, means any direct or indirect connection or coupling between two or more elements and It can include the presence of one or more intermediate elements between two “connected” or “coupled” elements. The coupling or connection between the elements may be physical, logical, or a combination thereof. As used herein, the two elements are radio frequency by using one or more wires, cables and / or printed electrical connections, and as some non-limiting and non-inclusive examples By using electromagnetic energy, such as electromagnetic energy having a wavelength in the region, microwave region, and light (both visible and invisible) region, it can be considered to be “connected” or “coupled” to each other.

  The reference signal may be abbreviated as RS (Reference Signal), and may be referred to as a pilot depending on an applied standard. Further, the correction RS may be called TRS (Tracking RS), PC-RS (Phase Compensation RS), PTRS (Phase Tracking RS), or Additional RS. Further, the demodulation RS and the correction RS may be called differently corresponding to each. Further, the demodulation RS and the correction RS may be defined by the same name (for example, the demodulation RS).

  As used herein, the phrase “based on” does not mean “based only on,” unless expressly specified otherwise. In other words, the phrase “based on” means both “based only on” and “based at least on.”

  The “unit” in the configuration of each apparatus described above may be replaced with “means”, “circuit”, “device”, and the like.

  As long as “including”, “comprising”, and variations thereof are used in the specification or claims, these terms are inclusive of the term “comprising”. Intended to be Furthermore, the term “or” as used herein or in the claims is not intended to be an exclusive OR.

  A radio frame may be composed of one or more frames in the time domain. One or more frames in the time domain may be referred to as subframes, time units, etc. A subframe may further be composed of one or more slots in the time domain. The slot may be further configured with one or a plurality of symbols (OFDM (Orthogonal Frequency Division Multiplexing) symbols, SC-FDMA (Single Carrier-Frequency Division Multiple Access) symbols, etc.) in the time domain.

  Each of the radio frame, subframe, slot, and symbol represents a time unit for transmitting a signal. Radio frames, subframes, slots, and symbols may be called differently corresponding to each.

  For example, in the LTE system, the base station performs scheduling for assigning radio resources (frequency bandwidth, transmission power, etc. that can be used in each mobile station) to each mobile station. The minimum scheduling time unit may be referred to as TTI (Transmission Time Interval).

  For example, one subframe may be called a TTI, a plurality of consecutive subframes may be called a TTI, and one slot may be called a TTI.

  A resource unit is a resource allocation unit in the time domain and the frequency domain, and may include one or a plurality of continuous subcarriers in the frequency domain. In the time domain of the resource unit, one or a plurality of symbols may be included, and one slot, one subframe, or a length of 1 TTI may be included. One TTI and one subframe may each be composed of one or a plurality of resource units. Moreover, a resource unit may be called a resource block (RB: Resource Block), a physical resource block (PRB: Physical RB), a PRB pair, an RB pair, a scheduling unit, a frequency unit, and a subband. Further, the resource unit may be composed of one or a plurality of REs. For example, 1 RE may be any resource (for example, the smallest resource unit) smaller than a resource unit serving as a resource allocation unit, and is not limited to the name RE.

  The structure of the radio frame described above is merely an example, and the number of subframes included in the radio frame, the number of slots included in the subframe, the number of symbols and resource blocks included in the slots, and the subframes included in the resource block The number of carriers can be variously changed.

  Throughout this disclosure, if articles are added by translation, for example, a, an, and the in English, these articles must be clearly indicated otherwise in context, Including multiple things.

(Aspect variations, etc.)
Each aspect / embodiment described in this specification may be used independently, may be used in combination, or may be switched according to execution. In addition, notification of predetermined information (for example, notification of being “X”) is not limited to explicitly performed, but is performed implicitly (for example, notification of the predetermined information is not performed). Also good.

  Although the present invention has been described in detail above, it will be apparent to those skilled in the art that the present invention is not limited to the embodiments described herein. The present invention can be implemented as modified and changed modes without departing from the spirit and scope of the present invention defined by the description of the scope of claims. Therefore, the description of the present specification is for illustrative purposes and does not have any limiting meaning to the present invention.

  One embodiment of the present invention is useful for a mobile communication system.

DESCRIPTION OF SYMBOLS 1 Radio base station 2a-2c User terminal 3 Core network 11 I / F part 12 Signal processing part 13 Radio | wireless part 14 Production | generation part 21 Radio | wireless part 22 Signal processing part 23 Control part

Claims (10)

A radio base station that performs radio communication with a user terminal whose intermittent reception cycle is set by a host device,
A signal processing unit for generating a radio frame;
A wireless unit that transmits the wireless frame to the user terminal by wireless communication;
A generation unit that generates a paging message that instructs the user terminal to acquire broadcast information including the frame number when the signal processing unit resets a frame number for synchronizing the radio frame;
The signal processing unit generates a radio frame including the paging message over a predetermined time after the frame number is reset,
The radio unit transmits a radio frame including the paging message to the user terminal.
Radio base station. The signal processing unit generates a radio frame including the paging message over the longest period of time among the intermittent reception periods that can be set in the user terminal.
The radio base station according to claim 1. The signal processing unit generates a radio frame including the paging message over a period of the longest period among the intermittent reception periods set in the plurality of user terminals located in the area.
The radio base station according to claim 1. The signal processing unit generates a radio frame including the paging message until the user terminal reaches a number one before the frame number for receiving the broadcast information.
The radio base station according to claim 1. The signal processing unit generates a radio frame including the paging message from a frame number at which the user terminal receives the broadcast information.
The radio base station according to claim 1. A wireless base station timing control method for performing wireless communication with a user terminal in which an intermittent reception cycle is set by a host device,
When the frame number for synchronizing the radio frame is reset, a paging message for instructing the user terminal to acquire broadcast information including the frame number is generated,
Generating a radio frame including the paging message for a predetermined time after resetting the frame number;
Transmitting the radio frame including the paging message to the user terminal;
Timing control method. A radio base station that performs radio communication with a user terminal whose intermittent reception cycle is set by a host device,
A signal processing unit for generating a radio frame;
A wireless unit that transmits the wireless frame to the user terminal by wireless communication;
A generator that generates a paging message that instructs the user terminal to acquire broadcast information including the frame number when the signal processor resets a frame number for synchronizing the radio frame;
The signal processing unit generates a radio frame including the paging message over a predetermined time before resetting the frame number,
The radio unit transmits a radio frame including the paging message to the user terminal.
Radio base station. A wireless base station timing control method for performing wireless communication with a user terminal in which an intermittent reception cycle is set by a host device,
When resetting a frame number for synchronizing radio frames, generate a paging message that instructs the user terminal to acquire broadcast information including the frame number;
Generating a radio frame including the paging message for a predetermined time before resetting the frame number;
Transmitting the radio frame including the paging message to the user terminal;
Timing control method. A user terminal whose intermittent reception cycle is set by a host device,
When a frame number for synchronizing radio frames is reset by the radio base station, paging for instructing reception of broadcast information including the frame number transmitted by the radio base station for a predetermined time before resetting A radio unit for receiving messages;
When receiving the paging message, a signal processing unit that receives the broadcast information at a predetermined frame number, acquires a frame number included in the broadcast information, and synchronizes the radio frame;
A user terminal. A radio base station that performs radio communication with a user terminal whose intermittent reception cycle is set by a host device,
When stopping radio wave output, a radio unit that stops radio wave output for a time longer than the intermittent reception cycle of the user terminal,
A wireless base station.

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