KR20180018186A - METHOD AND APPARATUS FOR SINGLE-CELL POINT-TO-MULTIPOINT TRANSMISSION iN NARROW BAND-INTERNET OF THINGS SYSTEM - Google Patents

Abstract

The present invention relates to a single-cell one-to-many transmission method and apparatus in a narrowband-IoT system. A method of a base station receiving narrowband single-cell multicast control channel (NSC-MCCH) change notification in a wireless communication system according to an aspect of the present invention comprises: a step of receiving a narrowband physical downlink control channel (NPDCCH) including a predetermined identifier in a common search space (CSS) set in valid sub-frames for the NSC-MCCH; and a step of trying to receive NSC-MCCH changed from NSC-MCCH duration receiving the NPDCCH when the NPDCCH includes the NSC-MCCH change notification. The CSS may be set by a maximum repetition transmission parameter and the number of repetition transmission times in the NSC-NCCH duration.

Description

TECHNICAL FIELD The present invention relates to a single-cell one-to-many transmission method and apparatus in a narrow-band Internet system,

The present invention relates to a wireless communication system, and more particularly to a single-cell one-to-many transmission method and apparatus in a narrow-band Internet system.

A radio access to a cellular Internet of Things (IoT) based on a large expansion on a non-backward-compatible variant of Evolved-Universal Terrestrial Radio Access (E-UTRA) IoT on Narrowband (NB), that is, NB-IoT, is being studied.

With the NB-IoT, it is possible to improve indoor coverage, a large number of low throughput devices, low delay sensitivity, extremely low device cost, low device power consumption, architecture.

Since the NB-IoT uses a very narrow bandwidth such as a bandwidth corresponding to one RB (Resource Block), it is necessary to redesign the physical channels and signals used in E-UTRA such as existing LTE (Long Term Evolution) . For example, a single-cell point-to-multipoint (SC-PTM) transmission introduced in order to support group communication in an LTE network needs to be redesigned in the NB-IoT system . However, specific measures have not yet been established.

SUMMARY OF THE INVENTION The present invention provides a method and apparatus for transmitting and receiving a change notification of an NSC-MCCH (Narrowband Single Cell Multicast Control CHannel) for a narrowband SC-PTM and a changed NSC-MCCH.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not intended to limit the invention to the precise forms disclosed. It will be possible.

A method for a base station to receive a narrowband single-cell multicast control channel (NSC-MCCH) change notification in a wireless communication system in accordance with an aspect of the present invention includes: Receiving a narrowband physical downlink control channel (NPDCCH) including a predetermined identifier in a search space (CSS); And attempting to receive a modified NSC-MCCH from the NSC-MCCH duration that received the NPDCCH if the NPDCCH includes the NSC-MCCH change notification, The repetition transmission parameter and the repetition transmission number.

The features briefly summarized above for the present invention are only illustrative aspects of the detailed description of the invention which are described below and do not limit the scope of the invention.

According to the present invention, there can be provided a change notification of NSC-MCCH (Narrowband Single Cell Multicast Control CHannel) for narrow-band SC-PTM and a method and apparatus for transmitting and receiving the changed NSC-MCCH.

In addition, according to the present invention, there is provided a method of setting up a common search space (CSS) for transmission of a narrow band physical downlink control channel (NPDCCH) including an NSC-MCCH change notification, and setting an NPDCCH downlink control Through the efficient design of the information (DCI), the signaling overhead for NSC-MCCH transmission can be reduced and the complexity of the terminal implementation can be reduced.

The effects obtained by the present invention are not limited to the above-mentioned effects, and other effects not mentioned can be clearly understood by those skilled in the art from the following description will be.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention, illustrate various embodiments of the invention and, together with the description, serve to explain the principles of the invention.
1 is a diagram showing a configuration of a wireless device according to the present invention.
2 and 3 are views for explaining the structure of a radio frame of the 3GPP LTE system.
4 is a diagram showing a structure of a downlink sub-frame.
5 is a diagram showing a structure of an uplink subframe.
6 is a diagram showing an example of NB-IoT according to the present invention.
7 is a view for explaining the NB-IoT operation mode according to the present invention.
8 is a diagram illustrating an SC-MCCH transmission method according to the present invention.
9 shows an example of an SC-MCCH transmission according to the present invention.
10 shows an example of the NCS-MCCH transmission method according to the present invention.
11 illustrates a method of signaling an NSC-MCCH change notification using an NPDCCH for NB-IoT paging according to the present invention.
12 shows a method of signaling an NSC-MCCH change notification using an NPDCCH for NB-IoT NSC-MCCH transmission according to the present invention.
13 is a flowchart illustrating a method of receiving an NSC-MCCH change notification of a terminal according to the present invention.
14 is a diagram for explaining a configuration of a processor of a wireless device according to the present invention.

Hereinafter, the contents related to the present invention will be described in detail with reference to exemplary drawings and embodiments, together with the contents of the present invention. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present disclosure rather unclear.

In addition, the present invention will be described with respect to a wireless communication network. The work performed in the wireless communication network may be performed in a process of controlling a network and transmitting data by a system (e.g., a base station) Work can be done at a terminal connected to the network.

That is, it is apparent that various operations performed for communication with a terminal in a network composed of a plurality of network nodes including a base station can be performed by a network node other than the base station or the base station. A 'base station (BS)' may be replaced by a term such as a fixed station, a Node B, an eNode B (eNB), an access point (AP) In addition, 'terminal' may be replaced with terms such as User Equipment (UE), Mobile Station (MS), Mobile Subscriber Station (MSS), Subscriber Station (SS) .

The terms used to describe embodiments of the present invention may be described by 3GPP LTE / LTE-Advanced (LTE-Advanced) standards documents, unless otherwise specified. It should be noted, however, that this is for economy and clarity of explanation only, and that the embodiments of the present invention are not limited to apply only to systems conforming to 3GPP LTE / LTE-A or its subsequent standards.

Hereinafter, a wireless device according to the present invention will be described.

1 is a diagram showing a configuration of a wireless device according to the present invention.

1 illustrates a terminal apparatus 100 corresponding to an example of a downlink receiving apparatus or an uplink transmitting apparatus and a base station apparatus 200 corresponding to an example of a downlink transmitting apparatus or an uplink receiving apparatus.

The terminal device 100 may include a processor 110, an antenna unit 120, a transceiver 130, and a memory 140. [

The processor 110 performs baseband-related signal processing and may include an upper layer processing unit 111 and a physical layer processing unit 112. The upper layer processing unit 111 may process an operation of a MAC (Medium Access Control) layer, an RRC (Radio Resource Control) layer, or a higher layer. The physical layer processing unit 112 can process the operation of the physical (PHY) layer (e.g., uplink transmission signal processing, downlink reception signal processing). The processor 110 may control the overall operation of the terminal device 100, in addition to performing baseband-related signal processing.

The antenna unit 120 may include one or more physical antennas, and may support MIMO transmission / reception when the antenna unit 120 includes a plurality of antennas. The transceiver 130 may include a radio frequency (RF) transmitter and an RF receiver. The memory 140 may store information processed by the processor 110, software related to the operation of the terminal device 100, an operating system, applications, and the like, and may include components such as buffers.

The base station apparatus 200 may include a processor 210, an antenna unit 220, a transceiver 230, and a memory 240.

The processor 210 performs baseband-related signal processing, and may include an upper layer processing unit 211 and a physical layer processing unit 212. The upper layer processing unit 211 may process the operations of the MAC layer, the RRC layer, or higher layers. The physical layer processing unit 212 can process the operation of the PHY layer (e.g., downlink transmission signal processing, uplink reception signal processing). In addition to performing baseband related signal processing, the processor 210 may also control operation of the entire base station apparatus 200. [

The antenna unit 220 may include one or more physical antennas, and may support MIMO transmission / reception when the antenna unit 220 includes a plurality of antennas. The transceiver 230 may include an RF transmitter and an RF receiver. The memory 240 may store information processed by the processor 210, software related to the operation of the base station 200, an operating system, applications, and the like, and may include components such as buffers.

The radio frame structure will be described below.

2 and 3 are views for explaining the structure of a radio frame of the 3GPP LTE system.

In a cellular wireless packet communication system, uplink or downlink transmission is performed on a subframe basis. One subframe is defined as a certain time interval including a plurality of symbols. The 3GPP LTE standard supports a Type 1 radio frame structure applicable to Frequency Division Duplex (FDD) and a Type 2 radio frame structure applicable to TDD (Time Division Duplex).

2 is a diagram showing the structure of a type 1 radio frame. One radio frame is composed of 10 subframes, and one subframe is composed of two slots in a time domain. The time taken for one subframe to be transmitted is called a transmission time interval (TTI). For example, the length of one subframe is 1 ms and the length of one slot is 0.5 ms. One slot may comprise a plurality of symbols in the time domain. The symbol may be an Orthogonal Frequency Division Multiplexing (OFDM) symbol in the downlink and a Single Carrier-Frequency Division Multiple Access (SC-FDMA) symbol in the uplink. The number of symbols included in one slot may vary according to the CP (Cyclic Prefix) setting. The CP has an extended CP and a normal CP. For example, in the case of a normal CP, the number of symbols included in one slot may be seven. In the case of the extended CP, since the length of one symbol is increased, the number of symbols included in one slot can be smaller than six in the case of the normal CP. If the channel condition is unstable, such as when the cell size is large or the UE moves at a high speed, an extended CP may be used to further reduce the inter-symbol interference.

In FIG. 2, assuming a case of a normal CP in a resource grid, one slot in the time domain corresponds to seven symbols. In the frequency domain, the system bandwidth is defined as an integer multiple of a resource block (RB), and the downlink system bandwidth is denoted by N ^DL and the uplink system bandwidth is ^denoted by N ^UL . The resource block is a resource allocation unit and corresponds to a plurality (for example, seven) of symbols corresponding to one slot in the time domain and a plurality (for example, twelve) of consecutive subcarriers in the frequency domain . Each element on the resource grid is called a resource element (RE). One resource block includes 12 x 7 resource elements. The resource grid of FIG. 2 can be applied equally to an uplink slot and a downlink slot. In addition, the resource grid of FIG. 2 can be equally applied to slots of a Type 1 radio frame and slots of a Type 2 radio frame to be described later.

3 is a diagram showing the structure of a Type 2 radio frame. The Type 2 radio frame is composed of two half frames. Each half frame includes five subframes, a downlink pilot time slot (DwPTS), a guard period (GP), an uplink pilot time slot (UpPTS) ≪ / RTI > Like the Type 1 radio frame, one subframe consists of two slots. DwPTS is used for initial cell search, synchronization, or channel estimation in the UE, in addition to data transmission / reception. UpPTS is used to synchronize the channel estimation at the base station and the uplink transmission synchronization of the UE. The guard interval GP is a period for eliminating the interference caused in the uplink due to the multipath delay of the downlink signal between the uplink and the downlink. DwPTS, GP, and UpPTS may be referred to as special subframes.

4 is a diagram showing a structure of a downlink sub-frame. A plurality of (for example, three) OFDM symbols in the front part of the first slot in one subframe corresponds to a control region to which the control channel is allocated. The remaining OFDM symbols correspond to a data region to which a physical downlink shared channel (PDSCH) is allocated. The downlink control channels used in the 3GPP LTE system include a Physical Control Format Indicator Channel (PCFICH), a Physical Downlink Control Channel (PDCCH), a Physical Hybrid Automatic Control Channel repeat request indicator channel, PHICH). In addition, an Enhanced Physical Downlink Control Channel (EPDCCH) can also be transmitted to the UEs in the data area.

The PCFICH includes information on the number of OFDM symbols transmitted in the first OFDM symbol of the subframe and used for control channel transmission in the subframe.

The PHICH includes HARQ-ACK information as a response of the uplink transmission.

(E) Control information transmitted through the PDCCH is referred to as downlink control information (DCI). The DCI includes uplink or downlink scheduling information or other control information according to various purposes such as an uplink transmission power control command for an arbitrary terminal group. The base station determines the (E) PDCCH format according to the DCI transmitted to the UE, and adds a CRC (Cyclic Redundancy Check) to the control information. The CRC is masked with an identifier called a Radio Network Temporary Identifier (RNTI) according to the owner or use of the (E) PDCCH. (E) If the PDCCH is for a specific UE, the cell-RNTI (C-RNTI) identifier of the UE may be masked in the CRC. Alternatively, if the PDCCH is for a paging message, a Paging Indicator Identifier (P-RNTI) may be masked to the CRC. If the PDCCH is for a system information block (SIB), the system information identifier and the system information RNTI (SI-RNTI) may be masked to the CRC. A random access-RNTI (RA-RNTI) may be masked to the CRC to indicate a random access response that is a response to the transmission of the UE's random access preamble.

5 is a diagram showing a structure of an uplink subframe. The UL subframe may be divided into a control domain and a data domain in the frequency domain. A physical uplink control channel (PUCCH) including uplink control information is allocated to the control region. A physical uplink shared channel (PUSCH) including user data is allocated to the data area. A PUCCH for one terminal is allocated to a resource block pair (RB pair) in a subframe. Resource blocks belonging to a resource block pair occupy different subcarriers for two slots. It is assumed that the resource block pair allocated to the PUCCH is frequency-hopped at the slot boundary.

6 is a diagram showing an example of NB-IoT according to the present invention.

NB-IoT can be linked to MTC (machine-type communication) or M2M (machine-to-machine) communication in terms of basic concepts from the point of view of Internet (IoT) except that narrow band is used. The NB-IoT is an information exchange between the NB-IoT terminals (UEs) 11 and 12 via the base station 15 not involving human interaction or the NB-IoT terminals 11 and 12 ) And the NB-IOT server 18, for example.

The NB-IOT server 18 is an entity communicating with the NB-IoT terminals 11 and 12. The NB-IoT server executes an application related to the NB-IoT, and provides the NB-IoT specific service to the NB-IoT terminals 11 and 12.

The NB-IoT terminals 11 and 12 are radio devices providing NB-IoT, and may be fixed or mobile.

7 is a view for explaining the NB-IoT operation mode according to the present invention.

The NB-IoT can operate in one of three operation modes as shown in FIG. The three operation modes are stand-alone operation mode, guard-band operation mode, and in-band operation mode.

Figure 7 (a) shows a stand alone mode of operation and is currently used in a GERAN (Enhanced Data Rates for GSM Evolution) radio access network (GSM / EDGE) system corresponding to one or more Global System for Mobile communications (GSM) Spectrum can be used. For example, one of the GSM carriers (e.g., the frequency range of the 200 kHz bandwidth) may be used for NB-IoT.

7B shows a protection-band operation mode, and resource blocks not used in a guard-band outside the bandwidth of the LTE carrier wave can be used.

FIG. 7C shows an in-band operation mode, and resource blocks within the bandwidth of the LTE carrier wave can be used. For example, one PRB in the LTE bandwidth (e.g., the frequency region of the 180 kHz bandwidth) may be used for NB-IoT.

NB-IoT devices are aimed primarily at supporting scenarios operating within or under the building to provide smart metering, smart home, and alarm services. This means that reliable data transmission and reception should be supported indoors or underground, which is a general performance degradation area, without restriction of deployment to NB-IOT devices. In addition, it should be able to maintain connectivity with multiple NB-IOT devices, which are capable of sustaining lower power consumption and complexity, while at the same time supporting approximately 50,000 single-cell standards. The requirements for the currently considered NB-IoT system based on the technologies studied in the GERAN system are shown in Table 1 below.

Performance Objectives Improved indoor coverage
(Improved indoor coverage) MCL (Maximum Coupling Loss) 164dB Cell capacity
(Cell Capacity) 52574 devices per cell
(52574 devices per cell) Reduced complexity
(Reduced complexity) Large-scale deployment or
To be very cheap based on the disposable method
(Very cheap based on mass scale deployment or in a disposable manner) Improved power efficiency
(Improved power efficiency) About 10 years of battery life
(About 10-year batter life) Latency
(Latency) 10 seconds for MAR exception reporting (generally support for relaxed delay characteristics)
(10 seconds for MAR (Mobile Autonomous Reporting) exception reports (in general support relaxed delay characteristics) coexistence
(Coexistence) GSM / WCDMA / LTE

Hereinafter, the SC-PTM in the LTE system related to the present invention will be described.

SC-PTM was introduced to support more efficient group communication in LTE networks.

The first characteristic of the SC-PTM transmission scheme differentiated from the MBMS transmission scheme is that it can service one base station unit, thereby facilitating efficient point-to-multipoint communication operation. This is due to the fact that the actual disaster situation does not occur in large local units but only occurs within one or two base stations.

The second feature of the SC-PTM transmission scheme is that it is possible to adjust the Modulation and Coding Scheme (MCS) level. Since the MBSFN communication scheme does not receive any feedback from the UEs, it can not know the channel status of the UEs. Therefore, the MCS scheduling is basically the most conservative and therefore the spectral efficiency is poor. In addition, since the unit of resource allocation for transmission of PMCH (Physical Multicast CHannel) is used as much as the total system bandwidth, not one PRB (Physical Resource Block) unit, the reduced allocation for resource allocation on the frequency of MBSFN communication scheme The scalability is not good, and when the amount of data to be transmitted in the PMCH subframe is small, the transmission efficiency is greatly reduced. On the other hand, the SC-PTM transmission may adaptively change at least the MCS value according to the channel environment of the UEs in the group based on the feedback information for the unicast PDSCH scheduling of the UEs. However, uplink (UL) feedback channel design for SC-PTM has not yet been introduced.

In addition, the SC-PTM transmission is not capable of performing unicast PDSCH transmission in the PMCH subframe, but can be multiplexed in the same carrier and subframe as the unicast PDSCH.

From the perspective of the network operator, SC-PTM transmission method can be considered as a preferred technique because SC-PTM group transmission scheme and unicast transmission scheme can be mixed and the radio resources can be used more flexibly.

Considering the SC-PTM technology in terms of delay, existing unicast PDSCH and PMCH transmission cause considerable queuing delay, while SC-PTM does not have scheduling delay of MCE (Multicast Coordination Entity) caused by PMCH transmission . Also, in the unicast PDSCH transmission, duplicated transmission is caused for a plurality of UEs. On the other hand, in the SC-PTM, since it can be transmitted to a plurality of UEs at once regardless of the shortage of radio resources and the number of UEs in the group It can have a small delay.

The LTE SC-MCCH transmission method and setting will be described below.

8 is a diagram illustrating an SC-MCCH transmission method according to the present invention.

The base station (or Evolved-Universal Terrestrial Radio Access Network (E-UTRAN)) may provide the terminal with a message (or information element (IE)) called SCPTMConfiguration.

The SCPTMConfiguration message includes control information applicable to an MBMS service transmitted through a Single-Cell MBMS Point-to-Multipoint Radio Bearer (SC-MRB), and can be transmitted to a plurality of UEs through an SC-MCCH (Multicast Control Channel) have.

The SC-MCCH (Multicast Control Channel) transmission is one per cell.

Both the SC-MCCH and the SC-MTCH ((Multicast Traffic Channel) transmission are transmitted on a DL-SCH (Downlink-Shared Channel)

The SC-MCCH provides a list of all MBMS services having MBMS sessions transmitted on the SC-MTCH (s). And provides information including each MBMS service Temporary Mobile Group Identity (TMGI), an optional session ID, an associated G-RNTI (Group-Radio Network Temporary Identifier), and scheduling.

Table 2 below shows the configuration of the SCPTMConfiguration message.

Table 2 below shows the configuration of the SCPTMConfiguration IE.

The SCPTMConfiguration message conveys the MBMS session information and the scheduling information for the associated SC-MTCH transmission (e.g., the scheduling period, the scheduling window, and the starting offset in the SC-MTCH-schedulingInfo field) do.

Referring to the SC-MTCH-SchedulingInfo field in the SC-MTCH-InfoList IE of Table 3 below, it can be confirmed that scheduling information for a subframe to which the SC-MTCH can be transmitted is provided.

In a SC-PTM (or SC-MTCH) transmission for a group consisting of a plurality of terminals, a CRC attached to a PDCCH (e.g., DCI format 1C) in a common search space 0.0 > G-RNTI < / RTI > by scrambling or scrambling. And performs SC-MTCH data transmission through the PDSCH scheduled by the PDCCH.

There is one G-RNTI value per TMGI (Temporary Mobile Group Identity), and an SC-PTM specific MCCH (i.e., SC-MCCH) has information on mapping between the TMGI and G- Signal.

The SC-MCCH transmission is indicated by the PDCCH using the DCI format 1C, scrambles the CRC of the PDCCH with the SC-RNTI, and instructs the terminals in the cell to transmit the related transmission. The setup information in the cell for SC-MCCH reception is provided to the UEs through the system information (System Information).

The System Information includes information on how the SC-MCCH is being transmitted in the cell through the system information block 20 (SIB20) as shown in Table 4. [ The SIB 20 includes information necessary for acquiring the control information association transmission of the MBMS using the SC-PTM.

The description of the fields included in the SIB 20 IE is defined as shown in Table 5 below.

SystemInformationBlockType20 field descriptions sc-mcch-ModificationPeriod
The SC-MCCH information can only be different if there is at least one such boundary in-between them. Value rf2 corresponds to 2 radio frames, value rf4 corresponds to 4 radio frames and so on. sc- mcch -duration
Indicates starting from the subframe indicated by sc-mcch-FirstSubframe, the duration in subframes during which SC-MCCH may be scheduled in PDCCH sub-frames, see TS 36.321 [6]. Absence of this IE means that SC-MCCH is only scheduled in the subframe indicated by sc-mcch-FirstSubframe. sc- mcch -Offset
Indicates that the SC-MCCH is set to SC-MCCH-RepetitionPeriod, which is the SC-MCCH-Offset. sc-mcch-FirstSubframe
Indicates the first subframe in which SC-MCCH is scheduled sc-mcch-RepetitionPeriod
Defines the interval between transmissions of SC-MCCH information, in radio frames. Value rf2 corresponds to 2 radio frames, rf4 corresponds to 4 radio frames and so on.

9 shows an example of an SC-MCCH transmission according to the present invention.

The MSs receiving the SIB 20 can transmit an SC-MCCH and confirm one SC-MCCH modification period as shown in FIG. In addition, the UEs acquire new SC-MCCH information from the same subframe as the subframe that received the SC-MCCH change notification signaling.

If the change notification signal is obtained in the first subframe of the MCCH modification period (n + 1) as shown in FIG. 9, the same MCCH information can be repeatedly transmitted within the same MCCH modification period.

In MBMS, MCCH can be changed by MCCH modification period. On the other hand, if change notification information is received in some subframes within one MCCH modification period in SC-PTM, changed MCCH information is received from the corresponding subframe.

Table 6 below shows the RNTI values for SC-PTM. That is, in Table 6, 0001-0960 The G-RNTI, SC-N-RNTI, and SC-RNTI of the values are the RNTI values associated with the SC-PTM.

Value ( hexa -decimal) RNTI 0000 N / A 0001-0960 RA-RNTI, C-RNTI, Semi-Persistent Scheduling C-RNTI, Temporary C-RNTI, eIMTA-RNTI, TPC-PUCCH-RNTI, TPC-PUSCH-RNTI and SL-RNTI, G- RNTI 0961-FFF3 RNTI, Semi-Persistent Scheduling C-RNTI, eIMTA-RNTI, Temporary C-RNTI, TPC-PUCCH-RNTI, TPC-PUSCH-RNTI and SL- FFF4-FFF9 Reserved FFFA SC-N- RNTI FFFB SC- RNTI FFFC CC-RNTI FFFD M-RNTI FFFE P-RNTI FFFF SI-RNTI

The G-RNTI is identification information for SC-MTCH transmission. The CRC scrambled with the G-RNTI value, and DCI format 1C are transmitted on the PDCCH in the CSS. The UEs receiving the PDCCH receive the PDSCH associated with the PDCCH and decode the data.

SC-RNTI is identification information for SC-MCCH transmission. The CRC scrambled with the SC-RNTI value, and the DCI format 1C are transmitted on the PDCCH in the CSS. The UEs receiving the PDCCH receive the PDSCH associated with the PDCCH and decode the control information.

The SC-N-RNTI is identification information for indicating the SC-MCCH change notification. The CRC scrambled with the SC-N-RNTI value, and the DCI format 1C are transmitted on the PDCCH within the CSS. The UEs receiving the PDCCH expect to receive the changed SC-MCCH information in the next SC-MCCH modification period.

In order to instruct the LTE SC-MCCH information change notification, the SC-MCCH change notification signaling in the first subframe among the SC-MCCH transmission subframes periodically transmitted as described above may be provided to the UEs in the cell by the base station . The SC-PTM terminal scrambles the CRC attached to the DCI format 1C by SC-N-RNTI. MCCH change notification signaling using 1 bit of the LSB (Least Significant Bit) in the 8-bit bitmap in the DCI format 1C to the UEs in the cell.

Table 7 below shows a description of the Control Information field of the DCI format 1 to which the CRC scrambled with the SC-N-RNTI is attached.

if the format 1C is used for notifying SC-MCCH change
- Information for SC-MCCH change notification - 8 bits
- Reserved information bits are added until the size is equal to that format 1C used for very compact scheduling of one PDSCH codeword

Hereinafter, examples of the present invention for SC-MCCH change notification for NB-IoT will be described.

First, the NB-IoT SC-MCCH change notification signaling will be described.

The transmission of the SC-MCCH on the NB-IoT system is hereinafter referred to as NSC-MCCH (Narrowband Single Cell Multicast Control CHannel). The NSC-MCCH is defined as a channel for transmitting control information on multicast data transmitted through an NSC-MTCH (Narrowband Single Cell Multicast Traffic Channel) in an NB-IoT system. NB terminals in the cell must receive SIB 20-NB in order to receive NSC-MCCH information.

In order for the UE supporting the NSC-PTM transmission scheme to support both the RRC IDLE and the RRC Connected modes, the base station transmits control information for NSC-MCCH reception to the UE via the SIB 20-NB. Table 8 below shows examples of control information for NSC-MCCH transmission, included in SIB20-NB.

field Explanation NSC-MCCH valid subframe / radio frame If the NSC-MCCH transmission is a valid subframe or radio frame setup
(Replaceable with SIB1-NB valid subframe setting) NSC-MCCH duration Indicates the number of consecutive NSC-MCCH valid subframe / radio frames indicated in the NSC-MCCH valid subframe setting NSC-MCCH repetition period A period in which one NSC-MCCH transmitted during the NSC-MCCH duration in one NSC-MCCH modification period is repeatedly transmitted NSC-MCCH Offset The NSC-MCCH transmission offset in which the first NSC-MCCH in one NSC-MCCH modification period is transmitted NSC-MCCH first subframe The first sub-frame index at which the NSC-MCCH is transmitted NSC-MCCH modification period NSC-MCCH modification section NSC-MCCH repetition Number of NSC-MCCH duration repetitive transmissions in consecutive NSC-MCCH valid subframe setting
(If the number of subframes in the NSC-MCCH duration indicates a maximum of 10 subframes as a bitmap, and it is assumed that the bitmap information is repeatedly generated as one NSC-MCCH duration, information on the number of repetitions Whereas it may not be necessary if the NSC-MCCH duration is set to have more than 10 subframe lengths)

Table 9 below shows an example of upper layer signaling for setting valid subframes for NB terminals. For example, an information element comprising the fields illustrated in Table 9 below may be referred to as DL-Bitmap-NB, which may be used to specify the set of NB-IoT downlink subframes for downlink transmission . If the NB terminal does not receive information on valid subframe setup (for example, DL-Bitmap-NB information element) from the NB base station, the NB terminal transmits the Narrowband Physical Broadcast CHannel (NPBCH), SIB1, Primary Synchronization Signal), or NSSS (Narrowband Secondary Synchronization Signal) is transmitted, it is assumed that the downlink subframe is a valid subframe.

In Table 9, subframePattern10 is bitmap information indicating NB-IoT downlink subframe setting over a time interval of 10 ms, and can be defined for the in-band, guard-band, and stand-alone operation modes. In addition, the subframePattern 40 is bitmap information indicating an NB-IoT downlink subframe setting over a time interval of 40 ms, and can be defined for an in-band operation mode. The first / leftmost bit of the bitmap corresponds to subframe # 0 satisfying SFN mod x = 0 in the radio frame, and x is a bit string divided by 10. Therefore, the setting can be repeatedly applied every 10 ms or every 40 ms. A value of 0 in the bitmap indicates that the corresponding subframe is invalid for downlink transmission and a value of 1 indicates that the corresponding subframe is valid for downlink transmission.

Among the information provided by the SIB20-NB in Table 8, the subframe setting for the NSC-MCCH transmission is not provided by the SIB20-NB, but instead the DL valid subframe setting provided by the SIB1-NB , Setting based on the DL-Bitmap-NB information element as shown in Table 9) can be assumed as an NSC-MCCH transmission sub-frame.

Thus, if there is no additional NSC-MCCH transmission subframe setup by the SIB 20-NB, the DL valid subframe setup provided by the SIBl-NB (e.g., by the DL-Bitmap-NB information element as shown in Table 9 above) Setting) is assumed to be the NSC-MCCH transmission sub-frame. If the DL valid subframe setting is not provided by the SIB1-NB, the SC-PTM terminals in the corresponding cell assume at least the remaining subframes except the subframe in which NPSS, NSSS, NPBCH, and SIB1- do.

The DL valid subframe setting provided through the SIB1-NB is commonly signaled to the terminals in the cell through the DL-Bitmap-NB information element as shown in Table 9 above.

10 shows an example of the NCS-MCCH transmission method according to the present invention.

In the example of FIG. 10, the NSC-MCCH transmission method based on the information provided through the SIB 20-NB is shown. That is, in the example of FIG. 10, the NB UE can receive the NSC-MCCH transmission information based on the NSC-MCCH transmission information received through SIB1-NB and / or SIB20-NB.

Basically, in order to support extreme coverage in an NB-IoT system that performs SC-PTM, the NSC-MCCH duration can consist of up to several thousand consecutive valid subframes. Subframes that are not DL valid subframes (e.g., subframes # 0, 4, 5 and 9 in Figure 10) do not count for NSC-MCCH duration.

If SI (remaining system information except SIB1-NB) is transmitted on the DL valid subframe and the SI transmission subframes overlap with NSC-MCCH duration, NSC-MCCH duration is not counted. Therefore, the NSC-MCCH duration overlapping with the SI transmission is not overlapped with the SI transmission, and the NSC-MCCH duration is delayed in the DL valid subframe.

If a Narrowband Positioning Reference Signal (NPRS) is transmitted on the DL valid subframe and the NPRSs overlap with the NSC-MCCH duration, the NSC-MCCH duration is not counted. Therefore, the NSC-MCCH duration overlapping with the SI transmission is not overlapped with the SI transmission, and the NSC-MCCH duration is delayed in the DL valid subframe. This operation is performed to simultaneously receive NPRS signals from a plurality of eNBs to ensure the performance of RSTD (Received Signal Time Difference) measurement.

The number of consecutive valid subframes constituting one NSC-MCCH duration may be set to one of {10, 20, 40, 80, 160, 320, 640, 1280, 2560}. The present invention is not limited to the above values but may be configured with other values.

The Offset parameter provides a value indicating the start of the NSC-MCCH duration based on SFN = 0 in radio frame units. In this case, if the subframe indicated by the instruction information indicating the first subframe of the NSC-MCCH is a DL valid subframe in the radio frame indicated by the offset parameter, valid The number of subframes is counted by the number of subframes corresponding to the NSC-MCCH duration. Also, the offset value may be provided in units of subframes. In this case, the setting for the first subframe of the NSC-MCCH may not be necessary.

A plurality of repetitive NSC-MCCH transmissions (NSC-MCCH duration) may be performed within one NSC-MCCH modification period. It is possible to repeat transmission as many times as NSC-MCCH repetition period within NSC-MCCH modification period.

Hereinafter, all the subframes described in the present invention are assumed to be valid subframes.

The same NSC-MCCH information is provided within the NSC-MCCH modification period, but the NSC-MCCH control information change is requested from the MCE (Multi-cell / Multicast coordination entity), and the base station can change the NSC- have.

The MCE manages and allocates radio resources for eNBs belonging to the MCE and is responsible for admission control for the MBMS service. Also, the MCE determines a modulation and coding scheme (hereinafter referred to as MCS) for the MBMS services and performs control on the MBMS session. The SC-PTM basically has a logical entity similar to the MBMS. The MCE determines whether to use SC-PTM or MBSFN for each MBMS session. The MCE also controls the MBMS session for SC-PTM transmission.

If the change is determined in the NSC-MCCH modification period n from the upper layer, the changed information will be transmitted in the next modification period n + 1.

An NSC-MCCH change notification signal can be transmitted in at least one subframe for each NSC-MCCH duration in which the NSC-MCCH in the NSC-MCCH modification period n is transmitted. For example, in each NSC-MCCH duration, an NSC-MCCH change notification signal is transmitted to the UEs from the first subframe or from the first subframe to N subframes, and the changed NSC- MCCH transmission can be predicted.

Next, the NSC-MCCH change notification signal signaling method will be described.

Basically, the SC-MCCH change notification in the SC-PTM is used only to inform the SC-MCCH that the start of the session will change the SC-MCCH. For the same purpose, the SC-MCCH change notification signaling may be provided to the NB-IoT terminal (i.e., the NB-IoT terminal supporting the SC-PTM) in the NB-IoT system. In the examples of the present invention, a method of transmitting the signaling and a method of setting a CSS for transmission of the NPDCCH for transmitting the signaling information will be described.

In the NB-IoT system, the DCI format N2 may be used to transmit a paging information message (or Paging-NB message) to the UE, or may be used to inform UEs that the system information is changed. Basically, in addition to transmitting a paging message, a paging signal for system information change can be transmitted to terminals using a direct indication field. The field information for the associated Direct Indication can be provided as shown in Table 11 below. The CRC for the DCI format N2 is scrambled using a Paging RNTI (P-RNTI), and a paging message is transmitted using a 1-bit flag field as shown in Table 10 below, Direct indication information is transmitted, and the BS can transmit to the UE in the form of DCI format N2.

Flag for paging / direct indication differentiation - 1 bit, with value 0 for direct indication and value 1 for paging
If Flag = 0:
- Direct Indication information - 8 bits provide direct indication of system information update and other fields
- Reserved information bits are added until the size is equal to that format N2 with Flag = 1

Bit Field in Direct Indication information One systemInfoModification 2 systemInfoModification-eDRX 3, 4, 5, 6, 7, 8 Not used, and shall be ignored by UE if received

According to the first embodiment of the present invention, the Direct Indication field in the DCI format N2 to which the CRC scrambled with the P-RNTI is attached can be reused and utilized for the NSC-MCCH change notification indication.

Specifically, when the value of the paging / Direct Indication distinguishing field (i.e., Flag field) in DCI format N2 is Flag 0, it indicates DCI format N2 having a direct indication information field. In this case, the Direct Indication field may be maintained at 8 bits or extended to 10 bits, and the systeminfoModification information and the newly added NSC-MCCH change notification (1 bit or 8 bits) information may be provided to the NB terminal in the form of a bitmap. Here, the plurality of bits constituting the bitmap correspond to the session ID information for the NSC-PTM transmission, respectively.

Hereinafter, a method of utilizing Type2 CSS for indicating an NSC-MCCH change notification will be described.

The Type 2 CSS is basically defined to transmit a paging message to inform NB-IoT system of paging message or system information change and to transmit a common search space (Type 2) in the cell to NB-IoT terminals.

11 illustrates a method of signaling an NSC-MCCH change notification using an NPDCCH for NB-IoT paging according to the present invention.

In the example of FIG. 11, NPDCCH transmission for paging in the Type 2 CSS and NSC-MCCH modification period are shown. The example of FIG. 11 shows a case where the maximum repetition transmission parameter R _max = 8 and the repetition transmission number R = 2.

Type 2 CSS configuration and NSC-MCCH configuration (for example, SIB20-NB) for paging transmission are performed independently.

One or more NB-IoT paging opportunity (PO) subframes may be set within one NSC-MCCH modification period.

Within a NB-IoT PO (paging opportunity), a particular subframe (s) in the Type 2 CSS is used for NSC-MCCH change notification indication, and the remaining subframes can be used for the original paging purpose.

For example, in an NB-IoT PO (paging opportunity), an NSC-MCCH change notification indication is sent from a first paging subframe to a R (for example, 2) repeatedly transmitted subframes in a Type 2 CSS Lt; / RTI > can be performed. In the example of FIG. 11, an NPDCCH transmission for an NSC-MCCH change notification indication is performed in a subframe corresponding to u = 0, and an NPDCCH transmission for paging transmission is performed in a subframe corresponding to u = 1 can see.

Table 12 shows possible NPDCCH candidates in Type 2 CSS. In Table 12, L is the aggregation level and indicates the number of NCCEs (Number of Control Channel Elements). One subframe includes two NCCEs. Type 2 NPDCCH transmission does not allow transmission with L = 1.

Table 13 shows an example of signaling indicating the NPDCCH CSS candidate.

Embodiment 1 does not require NPDCCH transmission by introducing a new signaling format or a new RNTI and reuses a signaling format for providing paging / direct information to all terminals in a group for NSC-PTM reception in a cell, -MCCH < / RTI > change notification information, thereby providing an advantage of reducing the signaling overhead for NPDCCH transmission.

Also, if NSC-PTM transmission is set on a plurality of carrier / serving cells (e.g., anchor PRBs and non-anchor set PRBs) for the UE , anchor PRB / carrier (NPSS / NSSS and PRB / carrier where the NPBCH transmission is assumed to the terminal), may be required.

DCI format N2 on the anchor PRB / carrier's CSS can be utilized to indicate an NSC-PTM (eg, NSC-MCCH change notification) on an additional set PRB / carrier other than the Anchor PRB / carrier.

Or to support NSC-PTM transmission of Non-Anchor PRB / carrier, the NB terminal can monitor specific CSS of Non-Anchor PRB / carrier. Therefore, the NB UE capable of receiving the SC-PTM from the anchor PRB / carrier as well as the non-anchor PRB / carrier must be able to monitor at least one CSS of the non-anchor PRB / carrier as well as the CSS for the anchor PRB / carrier . In this case, an NSC-PTM carrier indication as shown in Table 14 may not be required in the Anchor PRB / carrier. It may not be expected for the UEs to simultaneously monitor the Anchor PRB / carrier and the CSS on the Non-Anchor PRB / carrier in the same subframe in order to prevent the complexity of the NB terminal from increasing.

Table 14 below shows an example of Flag bits for paging and direct indication classification in DCI format N2.

NSC-PTM carrier indication - A carrier indicator (whether cross-carrier NSC-PTM transmission scheduling) for transmitting an NSC-MCCH change notification indicator when an SC-PTM transmission is performed on a carrier (PRB) other than an anchor carrier (PRB) This field is present)

Flag for paging / direct indication differentiation - 1 bit, with value 0 for direct indication and value 1 for paging
If Flag = 0:
- Direct Indication information - 10 bits provide direct indication of system information update and other fields
- Reserved information bits are added until the size is equal to that format N2 with Flag = 1

Table 15 below shows the new Direct Indication information (10-bit bitmap) for the NSC-MCCH change notification.

Bit Field in Direct Indication information One systemInfoModification 2 systemInfoModification-eDRX 3, 4, 5, 6, 7, 8, 9, 10 NSC-MCCH change notification

Table 16 below shows the new direct indication information (8-bit bitmap) when the flag bit is 0.

Bit Field in Direct Indication information One systemInfoModification 2 systemInfoModification-eDRX 3, 4, 5, 6, 7, 8 NSC-MCCH change notification

A bit value including at least the LSB in the NSC-MCCH change notification field (i.e., bitmap) in the direct indication information IE can be utilized for change notification signaling.

Embodiment 1 may require coordination between a paging transmission direct indication sub-frame for notifying paging information and system information change and a subframe for transmitting NSC-MCCH change notification information. Also, since NPDCCH for paging reception and NPDCCH for receiving NSC-MCCH change notification can not be distinguished from the terminal point of view through the same P-RNTI value, NPDCCH reception error may increase in a bad channel environment.

According to Embodiment 2 of the present invention, DCI format N1 or N2 to which a CRC scrambled with a new RNTI is attached can be utilized for NSC-MCCH change notification indication.

Embodiment 2 is a method of defining a new RNTI (e.g., NSC-N-RNTI) and scrambling the new RNTI value to a CRC attached to DCI format N1 or N2 to indicate an NSC-MCCH change notification. The DCI format N1 or N2 in which the CRC is scrambled by the new RNTI has a number of bits corresponding to the number of MBMS sessions that can be provided at the maximum in the NSC-PTM to indicate the NSC-MCCH change notification. For example, if the maximum number of MBMS sessions provided by the NSC-PTM is 8, the number of bits for indicating the NSC-MCCH change notification in the DCI format N1 or N2 is 8, An additional information bit is added to form one DCI format N1 or N2.

Table 17 below shows an example of a configuration of a new DCI format N1 or N2 that includes a CRC scrambled by a new RNTI (e.g., NSC-N-RNTI).

field Explanation SC-PTM carrier indication K bit (Determine the number of bits according to the maximum possible additional setting PRB / carrier number) - If cross-carrier NSC-PTM transmission scheduling is set, this field is present NSC-MCCH change notification 8 bits Reserved bits A reserved bit is added to keep the number of information bits such as the existing DCI format N1 or N2 (for the purpose of preventing increased blind decoding complexity)

The DCI format N1 or N2 where the CRC is scrambled by the new RNTI value is transmitted in the CSS. The DCI format N1 or N2 transmitted to indicate the NSC-MCCH change notification may be repeatedly transmitted within the CSS set by the base station.

The NSC-MCCH change notification indication information is transmitted in the first subframe every repetition period within the NSC-MCCH modification period. Therefore, the NSC-PTM UE in the cell monitors the DCI format N1 or N2 including the CRC scrambled by the new RNTI (for example, NSC-N-RNTI) in the corresponding subframe and tries to detect it.

Hereinafter, a method of using Type 3 CSS for indicating NSC-MCCH change notification will be described.

In the present invention, a new CSS can be defined for transmission of NSC-MCCH and change notification, which is referred to as Type 3 CSS. A construction method for CSS for DCI format N1 or N2 that provides the signaling will be described with reference to FIG.

12 shows a method of signaling an NSC-MCCH change notification using an NPDCCH for NB-IoT NSC-MCCH transmission according to the present invention.

In the example of FIG. 12, NPDCCH transmission for NSC-MCCH transmission and NSC-MCCH modification period are shown in Type 3 CSS. The example of FIG. 12 shows a case where the maximum repetition transmission parameter R _max = 8 and the repetition transmission number R = 2.

The NSC-MCCH configuration including the Type 3 CSS configuration for NSC-MCCH transmission is provided to the UEs by the system information (for example, SIB20-NB).

It can be used for NSC-MCCH transmission and NSC-MCCH change notification signaling from a first subframe (NSC-MCCH first subframe) within one NSC-MCCH duration to a subframe set with CSS starting from a specific subframe set in the upper layer have. For example, a Type 3 CSS for NSC-MCCH transmission within the NSC-MCCH duration can be defined by Rmax subframes starting from the first subframe. The UE receiving the NPDCCH transmission in which the CRC is scrambled with the NSC-N-RNTI (or SC-N-RNTI) value in the Type 3 CSS can acquire information on the NSC-MCCH change notification. Here, the NSC-MCCH change notification signaling may be transmitted in the first subframe of the corresponding Type 3 CSS configured subframe or in a specific subframe set in the upper layer. In addition, since the NSC-MCCH information should also be transmitted in the Type 3 CSS, the UE receiving the NPDCCH transmission in which the CRC is scrambled with the NSC-RNTI (or SC-RNTI) value can acquire information on the NSC-MCCH . Therefore, the start subframe of the Type 3 CSS is determined based on the NSC-MCCH first subframe provided in the SIB 20-NB or a specific subframe set in the upper layer. In addition, the NSC-MCCH change notification signaling may be additionally determined based on the first subframe in the determined Type 3 CSS or a specific subframe set in the upper layer.

The UE receiving the NSC-MCCH change notification signaling in a certain NSC-MCCH duration through the Type 3 CSS within one NSC-MCCH modification period expects to obtain the changed NSC-MCCH reception information from the same NSC-MCCH duration. As shown in FIG. 12, it can be confirmed that the changed NSC-MCCH (New NSC-MCC) is repeatedly transmitted from the specific NSC-MCCH duration in which the NSC-MCCH change notification signaling is received. Therefore, the UE receiving the change notification signaling performs the NSC-MTCH reception based on the newly changed NSC-MCCH information without using the previous NSC-MCCH information.

The possible NPDCCH candidates in the Type 3 CSS can be defined as shown in Table 12 above. Type 3 NPDCCH transmission does not allow transmission with L = 1. Also, the scope of the present invention is not limited to the values illustrated in Table 12. [

13 is a flowchart illustrating a method of receiving an NSC-MCCH change notification of a terminal according to the present invention.

In step S1310, the UE can determine a valid subframe for the MSC-MCCH. Specifically, the UE can determine a valid subframe for the NSC-MCCH considering the signaling provided from the base station or another downlink channel or signal (NPBCH, NPSS NSSS, etc.).

Also, the UE transmits NSC-MCCH based on the signaling from the base station for NSC-MCCH duration, NSC-MCCH repetition period, NSC-MCCH offset, NSC-MCCH first subframe, NSC- The NSC-MCCH duration included in the NSC-MCCH modification period to be determined.

In step S1320, the UE can determine the CSS for the NSC-MCCH among the valid subframes based on the information of the NSC-MCCH modification period and the NSC-MCCH set by the SIB 20. The UE can receive the setting information for the CSS to attempt to receive the NPDCCH including the NSC-MCCH information or the NSC-MCCH change notification from the base station. The setting information for the CSS may include the maximum repetition transmission parameter Rmax and the number of repetitive transmissions R, the starting subframe and the starting subframe offset information.

In step S1330, the UE can attempt to receive the NPDCCH including the NSC-MCCH information and the NSC-MCCH change notification in the CSS.

In step S1340, based on the NSC-MCCH change notification, the UE can attempt to receive the changed NSC-MCCH within the same NSC-MCCH duration as the received NSC-MCCH duration.

Although the above-described exemplary methods are represented by a series of acts for clarity of explanation, they are not intended to limit the order in which the steps are performed, and if necessary, each step may be performed simultaneously or in a different order. In addition, not all illustrated steps are necessary to implement the method according to the present invention.

The foregoing embodiments include examples of various aspects of the present invention. While it is not possible to describe every possible combination for expressing various aspects, one of ordinary skill in the art will recognize that other combinations are possible. Accordingly, it is intended that the invention include all alternatives, modifications and variations that fall within the scope of the following claims.

The scope of the invention includes apparatus for processing or implementing operations in accordance with various embodiments of the present invention.

14 is a diagram for explaining a configuration of a processor of a wireless device according to the present invention.

The processor 210 of the base station device 200 may be configured to implement base station operation in all of the embodiments described herein.

For example, the upper layer processing unit 211 of the processor 210 of the base station apparatus 200 may include an NSC-MCCH modification period determination unit 1410. The NSC-MCCH modification period determiner 1410 generates information such as an NSC-MCCH duration, an NSC-MCCH repetition period, an NSC-MCCH offset, an NSC-MCCH first subframe, an NSC-MCCH modification period, To the terminal device 100 through the physical layer processing unit 212. [

For example, the physical layer processing unit 212 of the processor 210 of the base station apparatus 200 may include an NSC-MCCH change notification transmitting unit 1420 and a modified NSC-MCCH transmitting unit 1430. The NSC-MCCH change notification transmitting unit 1420 can transmit the NPDCCH including the NSC-MCCH change notification on the CSS set for the NSC-MCCH. The changed NSC-MCCH transmitting unit 1430 can transmit the changed NSC-MCCH in the same NSC-MCCH duration as the NSC-MCCH duration in which the NSC-MCCH change notification is transmitted.

The processor 110 of the terminal device 100 may be configured to implement the terminal operation in all of the embodiments described in the present invention.

For example, the upper layer processing unit 111 of the processor 110 of the terminal device 100 may include an NSC-MCCH modification period determining unit 1440. The NSC-MCCH modification period determiner 1440 determines the NSC-MCCH modification period, the NSC-MCCH modification period, the NSC-MCCH modification period, the NSC- The NSC-MSC duration included in the NSC-MCCH modification period can be determined based on information such as the MCCH repetition.

For example, the physical layer processing unit 112 of the processor 110 of the terminal device 100 may include an NSC-MCCH change notification receiving unit 1450 and a modified NSC-MCCH receiving unit 1460. The NSC-MCCH change notification receiving unit 1450 may attempt to receive the NPDCCH including the NSC-MCCH change notification on the CSS set for the NSC-MCCH. The changed NSC-MCCH receiver 1460 may attempt to receive the changed NSC-MCCH in the same NSC-MCCH duration as the NSC-MCCH duration in which the NSC-MCCH change notification is transmitted.

In the operation of the terminal device 100 and the base station device 200, the same elements as those described in the exemplary embodiments of the present invention can be similarly applied, and redundant description will be omitted.

While various embodiments of the present invention have been described with reference to 3GPP LTE or LTE-A systems, they may be applied to various mobile communication systems.

Claims (5)

A method for a base station in a wireless communication system to receive a narrowband single-cell multicast control channel (NSC-MCCH) change notification,
Receiving a narrowband physical downlink control channel (NPDCCH) including a predetermined identifier in a common search space (CSS) set within valid subframes for the NSC-MCCH; And
If the NPDCCH includes the NSC-MCCH change notification, attempting to receive the changed NSC-MCCH from the NSC-MCCH duration that received the NPDCCH,
Wherein the CSS is set by a maximum repetition transmission parameter and a repetition transmission number in the NSC-NCCH duration. The method according to claim 1,
The predetermined identifier is a P-Radio Network Temporary Identifier (P-RNTI)
The NPDCCH includes a paging and direct indication information classification field,
Wherein the NSC-MCCH change notification information includes NSC-MCCH change notification information when the value of the paging and direct indication information field is zero. 3. The method of claim 2,
The number of subframes corresponding to the value of the maximum repetition transmission parameter is set in the CSS from the first subframe within the paging opportunity,
Wherein the number of subframes corresponding to the number of repeated transmissions from the first subframe is set to the CSS for the NPDCCH including the NSC-MCCH change notification. The method according to claim 1,
Wherein the predetermined identifier is NSC-N-RNTI. The method according to claim 1,
A number of subframes corresponding to the value of the maximum repetition transmission parameter is set in the CSS from the first subframe in the NSC-NCCH duration,
Wherein the number of subframes corresponding to the number of repetitive transmissions from the first subframe is set to the CSS for the NPDCCH including the NSC-MCCH change notification.

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