[0001]The disclosure herein relates to a wireless communication system that performs communication control for coverage improvement.
BACKGROUND
[0002]In 3GPP Long Term Evolution (LTE), improvement and standardization of technology for the realization of higher speed communications decrease in communication quality due to rapid increase in recent mobile traffic is being performed. Moreover, it is also being standardized technique to avoid an increase in control signaling load due connection to the vast number of Machine-to Machine (M2M) terminal of LTE networks expected future (Non-patent Document 1). Here, M2M terminal refers to a terminal that performs communication such as a human does not intervening. M2M terminal machine (eg, vending machines, gas meters, electric meters, automobiles, railway vehicles, ships) and the sensor is mounted on a variety of devices such as (eg, environmental, agricultural, sensors about traffic, etc.). In LTE, referred to communication by M2M terminal and Machine Type Communication (MTC), referred to as terminal MTC terminal for MTC (MTC User Equipment (MTC UE)).
[0003]
　M2M service operators there is a need to distribute a large number of M2M terminals on the market, but there is a limit to the cost applied to the per M2M terminal. For this purpose, M2M terminal to be implemented at low cost, that can communicate with low power consumption, etc. is required. Further, as one use case of MTC UE, when performing communication while being fixed or statically installed in a building (e.g., a building) it is assumed. In this case, there is always less likely radio quality of the MTC UE, usually of the UE, which generally have a mobility compared to (eg, mobile phone, smart phone, tablet computer, a notebook personal computer (notebook PC)) technology for coverage improvement is needed. As the function restriction for cost reduction, for example, the maximum transmission power is small, the number of receiving antennas is small, it does not support the high-order modulation scheme (eg 64 Quadrature Amplitude Modulation (64QAM)), the available radio bandwidth is a narrow-band (eg 1.25 MHz), and the like are considered, thereby the maximum transmission rate of the MTC UE is reduced. Accordingly, the communication characteristics of the MTC UE is expected to be inferior In LTE, the normal UE (i.e., coverage) standardization of techniques for improving is performed (Non-Patent Document 2). Hereinafter, an example of a technology for improving the coverage of the MTC UE being considered in LTE. Note that coverage improvement technologies (coverage improvement process) for the MTC UE described below, can also be referred to as processing for improving or enhancing the communication characteristics or communication quality of MTC UE. UE state to apply these special coverage improvement technique is called coverage improvement mode (Enhanced Coverage Mode (ECM)).
[0004]
　Characteristics that are improved by the ECM (detection characteristics in other words eNB) transmitting characteristics of the reception characteristics, Physical Random Access Channel (PRACH) preamble Physical Broadcast Channel (PBCH), Physical Downlink Shared reception characteristics Channel (PDSCH), Physical Uplink transmission characteristics of the Shared Channel (PUSCH), and the like. PBCH is a downlink broadcast channel used for transmitting the cell common broadcast information by eNB. PRACH is a physical uplink channel used for initial access to the UE in the radio base station (eNB). PDSCH is a downlink physical channel used for data reception by the UE. PUSCH is a physical uplink channel used for data transmission by UE.
[0005]
　One of the process that is being considered to improve the reception characteristics of the PBCH is to repeat the transmission of the notification information by a predetermined number of times extra PBCH than normal (non-patent document 3). One of the processes has been studied to improve the transmission characteristics of the PRACH is to repeat the transmission of the PRACH (i.e. preamble) a predetermined number of times (non-patent document 4). Furthermore, one of the processing that has been studied to improve the transmission characteristics of the reception characteristics and PUSCH of PDSCH is to repeatedly transmit the PDSCH and PUSCH over a plurality subframes (Non-Patent Document 5). By these processes, it is expected that normally be degraded from UE to improve the communication characteristics of the MTC UE expected.
[0006]
　These coverage improvement process in the ECM, be performed as an object the MTC UE performing delay-insensitive access (delay tolerant access) is assumed. delay tolerant access is defined as a new EstablishmentCause specified by RRC Connection Request message, it is used to control, for example, overload. delay tolerant access is the MTC UE to perform delay tolerant of MTC application is intended primarily. For example, the metering service (meter reading service), the transmission to the meter reading report remote system (or in strict communication cycle) in real time without the need to perform might tolerate long delays in the transmission of meter reading report. The eNB, delay tolerant when applying the overload control for access, may reject the RRC Connection Request sent by the RRC Connection Request message with an EstablishmentCause specified in delay tolerant access.
CITATION
Non-patent literature
[0007]
非特許文献1 : 3GPP TR 37.868 V11.0.0 (2011-09), “3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Study on RAN Improvements for Machine-type Communications; (Release 11)”, 2011年9月
非特許文献2 : 3GPP TR 36.888 V12.0.0 (2013-06), “3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Study on provision of low-cost Machine-Type Communications (MTC) User Equipments (UEs) based on LTE (Release 12)”, 2013年6月
非特許文献3 : 3GPP R1-135943, Vodafone, “Way Forward on P-BCH for MTC enhanced coverage”, 3GPP TSG RAN WG1 #75, San Francisco, USA, 11-15 November 2013
非特許文献4 : 3GPP R1-135944, Vodafone, “Way Forward on PRACH for MTC enhanced coverage”, 3GPP TSG RAN WG1 #75, San Francisco, USA, 11-15 November 2013
非特許文献5 : 3GPP R1-136001, Vodafone et al. “Way forward on PDCCH, PDSCH, PUCCH and PUSCH for MTC enhanced coverage”, 3GPP TSG RAN WG1 #75, San Francisco, USA, 11-15 November 2013
Summary of the Invention
Problems that the Invention is to Solve
[0008]
　Present invention have studied about various problems when applying the coverage improvement process in ECM in MTC UE (M2M terminal). As an example, the present inventor has cell selection MTC UE that supports ECM, cell reselection, and was examined handover. That is, in the case not necessary and where necessary coverage improvement process in ECM in MTC UE, MTC UE is stay (camp on) should cell may be different. However, current cell selection criteria (e.g., LTE of cell selection criterion S (S-criterion)), the cell reselection criteria (e.g., LTE of cell-ranking criterion R (R-criterion)), and handover criteria (e.g., LTE of measurement report triggering condition for Events A1 to A6) is, ECM has not been considered at all about in terms of whether it is necessary for the MTC UE. Therefore, there is a possibility that the MTC UE that supports ECM can not properly selecting the cell to stay. Alternatively, even in the otherwise and if at least one in ECM cell and its surrounding cells MTC UE stays are supported, MTC UE is stay (camp on) should cell may be different.
[0009]
　Therefore, one of the objective to be achieved is the embodiment disclosed herein, such that the MTC UE that supports special coverage improvement process (eg, coverage improvement process in ECM) can stay in the appropriate cell MTC UE (M2M terminal) which is improved in order to, to provide a base station, a method, and a program. Incidentally, this objective should more embodiments disclosed herein is noted that only one of several objects of it and to achieve. Other objects or problems and novel features will become apparent from the description, or the accompanying drawings of this specification.
Means for Solving the Problems
[0010]
　In one embodiment, M2M terminal includes a wireless communication unit and a control unit. The wireless communication unit is configured to communicate with the base station. The control unit, depending on whether it is necessary to predetermined coverage improvement process, or according to whether the coverage improvement process at least one of the M2M terminal cell and its surrounding cells stay is supported Te, cell selection operation, and is configured to change at least one of cell reselection operation, and handover operation.
[0011]
　In one embodiment, the base station apparatus includes a radio communication unit and control unit. The wireless communication unit is configured to communicate with M2M terminal. Wherein, the predetermined coverage improvement process depending on whether it is necessary for the M2M terminal, or the coverage improvement process at least one of the M2M terminal cell and its surrounding cells stay is supported depending on whether it is a cell selection operation, a cell reselection operation, and at least one handover operation is configured to support the M2M terminal to be changed by the M2M terminal.
[0012]
　In one embodiment, the method performed by the M2M terminal, at least one of according to whether it is necessary, or the cell and its surrounding cells the M2M terminal to stay for a given coverage improvement process is the M2M terminal in comprising the coverage improvement process depending on whether it is supported, the cell selection operation, a cell reselection operation, and to change at least one of the handover operation.
[0013]
　In one embodiment, the method performed by the base station apparatus, the predetermined coverage improvement process depending on whether it is necessary for the M2M device, or at least one cell and its neighboring cells the M2M terminal stays in depending on whether or not the coverage improvement process is supported, the M2M cell selecting operation by the terminal, the cell reselection operation, and at least one handover operation comprises supporting the M2M terminal to be changed .
[0014]
　In one embodiment, M2M terminal includes a wireless communication unit and a control unit. The wireless communication unit is configured to communicate with the base station. Wherein the control unit is configured to receive the first and second value assigned to the first parameter used for cell reselection or handover from the base station. The first value, when the predetermined coverage improvement process is not necessary for the M2M terminal, is assigned to the first parameter in the controller. The second value, when the predetermined coverage improvement process is necessary for the M2M terminal, is assigned to the first parameter in the controller.
[0015]
　In one embodiment, the base station apparatus includes a radio communication unit and control unit. The wireless communication unit is configured to communicate with M2M terminal. Wherein the control unit is configured to notify the first and second values ​​to be substituted for cell reselection or handover to the first parameter used by the M2M terminal to the M2M device. The first value, when the predetermined coverage improvement process is not necessary for the M2M terminal, is assigned to the first parameter in the M2M terminal. The second value, when the predetermined coverage improvement process is necessary for the M2M terminal, is assigned to the first parameter in the M2M terminal.
[0016]
　In one embodiment, the method performed by the M2M terminal includes receiving a first and a second value assigned to the first parameter used for cell reselection or handover from the base station. The first value, when the predetermined coverage improvement process is not necessary for the M2M terminal, is assigned to the first parameter in the M2M terminal. The second value, when the predetermined coverage improvement process is necessary for the M2M terminal, is assigned to the first parameter in the M2M terminal.
[0017]
　In one embodiment, the method performed by the base station apparatus, notifies the first and second values ​​to be substituted for cell reselection or handover to the first parameter used by the M2M terminal to the M2M terminal including that. The first value, when the predetermined coverage improvement process is not necessary for the M2M terminal, is assigned to the first parameter in the M2M terminal. The second value, when the predetermined coverage improvement process is necessary for the M2M terminal, is assigned to the first parameter in the M2M terminal.
[0018]
　In one embodiment, the base station apparatus includes a radio communication unit and control unit. The wireless communication unit is configured to communicate with M2M terminal. Wherein the control unit is configured such that a predetermined coverage improvement process of notifying the cell reselection parameters, or the handover parameters are adjusted according to whether it is necessary for the M2M terminal to the M2M device.
[0019]
　In one embodiment, the method performed by the base station apparatus, the predetermined coverage improvement process is the cell reselection parameters, or the handover parameters are adjusted according to whether it is necessary for the M2M terminal to the M2M terminal including that the notification to.
[0020]
　In one embodiment, the program includes the when loaded into a computer, instructions for performing any of the methods described above to a computer (software code).
Effect of the invention
[0021]
　According to the above embodiments, special coverage improvement process MTC UE that is modified to MTC UE that supports (eg, coverage improvement process in ECM) to be able to stay in the appropriate cell (M2M terminal) base station, a method, and a program can be provided. This effect should be noted that only one of the plurality of effects are expected to be provided by a plurality of embodiments disclosed herein.
BRIEF DESCRIPTION OF THE DRAWINGS
[0022]
FIG. 1 is a diagram illustrating a configuration example of a wireless communication system according to the first embodiment.
FIG. 2 is a flow chart showing an example of the operation of the M2M terminal (MTC UE) according to the first embodiment.
3 is a sequence diagram showing an example of the operation of the M2M terminal according to the first embodiment (MTC UE) and the base station (eNB).
4 is a flowchart showing an example of the operation of the base station (eNB) according to the first embodiment.
5 is a sequence diagram showing an example of a communication procedure according to the second embodiment.
6 is a sequence diagram showing an example of a communication procedure according to the third embodiment.
7 is a sequence diagram showing an example of a communication procedure according to the fourth embodiment.
8 is a sequence diagram showing another example of a communication procedure according to the fourth embodiment.
9 is a sequence diagram showing an example of a communication procedure according to the fifth embodiment.
[10] is a sequence diagram showing another example of a communication procedure according to the fifth embodiment.
11 is a sequence diagram showing another example of a communication procedure according to the sixth embodiment.
It is a block diagram showing a configuration example of FIG. 12] M2M terminal according to an embodiment of the present invention (MTC UE).
13 is a block diagram showing an exemplary configuration of a base station (eNB) according to an embodiment of the present invention.
DESCRIPTION OF THE INVENTION
[0023]
　Hereinafter, specific embodiments will be described in detail with reference to the drawings. In the drawings, the same or corresponding components are denoted by the same reference numerals, for clarity of description, repeated explanation is omitted as appropriate.
[0024]
　A plurality of embodiments described below can can either be carried out independently, also be implemented in appropriate combination. These several embodiments have different novel features together. Accordingly, the plurality of embodiments, contribute to solving the different purpose or task to each other, which contributes to achieve different effects from each other.
[0025]

　FIG 1 shows a configuration example of a wireless communication system according to this embodiment. The wireless communication systems provide communication services, both for example, voice communication or packet data communication, or these. Referring to FIG. 1, the wireless communication system includes a M2M terminal 11 (11A, 11B), typical wireless terminal 12 is not a M2M terminal, the base station 13, base station 14 and a core network 15,. Wireless terminal 12 is, for example, a mobile phone, a smart phone, a tablet computer or a notebook PC,. In the present embodiment, the wireless communication system is described as a 3GPP LTE system. That, M2M terminal 11 corresponds to the MTC UE, the radio terminal 12 corresponds to a normal UE not MTC UE, the base station 13 and 14 correspond to eNodeB (eNB), a core network 15 Evolved Packet Core (EPC It corresponds to).
[0026]
　Figure 1 shows an example of a heterogeneous network (HetNet). That, eNB13 manages the cells 130, ENB14 manages the cell 140 to cover a narrow range as compared to the cell 130. For example, eNB13 is a macro base station, ENB14 is pico base station. However, the present embodiment, the cell 130 and the cell 140 may be applied to a homogeneous network with the same order of magnitude.
[0027]
　In Figure 1, MTC UE11A is fixedly installed in the vicinity of the boundary of the cell 130 and cell 140 of eNB14 of eNB13, it is envisioned radio quality is relatively poor. If MTC UE11A is limiting the ability or functionality compared to conventional UE 12 (eg, the maximum transmission power is small, the number of reception antennas is small, support city such higher order modulation) if it has a radio quality degradation further It is expected to be noticeable. Meanwhile, MTC UE11B includes, for example, an automobile is mounted on a transportation machine such as a railway vehicle, or watercraft, thus mobility. MTC UE11B is moving from the cell 130 in the direction of the cell 140. If MTC UE11B is, if you have a limited ability or function compared to the normal UE 12, the mobility characteristics can be lower than normal terminal 12. Accordingly, the communication characteristics of the MTC UE 11 is expected to deteriorate by thus significantly affected by changes in the radio quality caused by the movement. Thus, MTC UE 11 according to the present embodiment (11A and 11B) supports the above Enhanced Coverage Mode (ECM), and is configured to be able to perform a coverage improvement process in ECM.
[0028]
　As already mentioned, the coverage improvement process in ECM may also be referred to as processing for improving or enhancing the communication characteristics of the MTC UE (communication quality). Coverage improvement processing in the ECM, as already mentioned, the following (a) may comprise - at least one of (d), include other different processing from these, for example, the (e) ~ (f) But good:
(a) repeating the transmission of the broadcast information by only extra PBCH predetermined number of times than normal,
(b) PPACH repeating a predetermined number of times transmission of the (PRACH preamble),
the PDSCH over (c) a plurality subframes repeating transmission,
(d) repeating the transmission of the PUSCH over multiple sub-frames,
(e) PDSCH or PUSCH or both power spectral density (power spectral density (PSD)) to be higher that (PSD boosting),
(f ) to the frequency hopping between the PDSCH or PUSCH or both repeated transmission.
[0029]
　Here, the sub-frame is a unit constituting the LTE radio frame. The length of one radio frame is 10 ms, one radio frame consists of 10 subframes (subframe). Therefore, the length of one subframe is 1 ms. One subframe includes 14 symbols in the time domain (if the uplink single carrier frequency division multiple access (SC-FDMA) symbols, if the downlink orthogonal frequency division multiplexing (OFDM) symbols).
[0030]
　Then hereinafter, a description will be given of a communication control for the ECM according to the present embodiment. MTC UE 11 according to this embodiment, ECM (coverage improvement process in the ECM) depending on whether it is necessary for the MTC UE 11, or MTC UE 11 is cell to stay (serving cell) (eg, cell 130 ) and according to whether the surrounding cell (neighbouring cell) (eg, at least one in ECM cell 140) is supported, the cell selection operation, a cell reselection operation, and modifying at least one handover operation . ECM is determined whether it is necessary (or whether or not the ECM is performed in MTC UE 11) for MTC UE 11 may be performed by MTC UE 11, it may be performed by eNB13.
[0031]
　Cell selecting operation by the MTC UE 11 includes cell selection in a state where MTC UE 11 does not camp on either of the cell (or eNB). Cell reselection operation according to MTC UE 11 includes cell changes which MTC UE 11 is performed after camping on successfully to any one of the cells. Further, the handover operation by the MTC UE 11 includes a transmission operation of the transmission operation of the handover request, or measurement report triggering a handover (measurement report). As is well known, in many wireless communication systems including LTE, execution of handover it is determined by the apparatus of the wireless terminal (UE), not the network side (eg, base station), the wireless terminal (UE) handover the measurement report for triggering the sending to the network (eg, base station). Measurement report typically indicates the radio quality of the serving cell by the radio terminal (UE) is staying, the radio quality of the neighboring cell.
[0032]
　For example, MTC UE 11 may, ECM (i.e., coverage improvement process in ECM) for itself in itself and otherwise and if it is determined that it is necessary to these operations (i.e., a cell selection operation, re-cell selection operation, and it may change at least one of a handover operation). Further, MTC UE 11 is in the case itself is not the case and when running the ECM, may change at least one of these operations. Further, MTC UE 11 may change at least one of these operations in the case ECM that is needed otherwise and if it is determined in eNB13 for MTC UE 11.
[0033]
　Meanwhile, eNB13 may, ECM depending on whether it is necessary for the MTC UE 11, or cells (eg, cell 130) MTC UE 11 stays and its neighboring cells (eg, cell 140), at least one in the above depending on whether the coverage improvement process is supported, the cell selecting operation of the MTC UE 11, the cell reselection operation, and the MTC UE 11 may support such that at least one is changing the handover operation. eNB14 may operate in the same manner as the eNB13 also. For example, eNB13 a notification indicating that the ECM is supported in the cell 130 (or eNB13), it may be transmitted in the cell 130 as MTC UE 11 can receive. In combination or with which Alternatively, eNB13 is (with or executed) require ECM cell selection parameter adjusted for MTC UE, cell reselection parameters, or the handover parameters sent to the MTC UE 11 it may be.
[0034]
　In this specification, ECM (i.e., coverage improvement process in ECM) if is not necessary for the MTC UE 11, the operation performed in MTC UE 11, the "normal" cell selection operation, the "normal" cell selection operation , and is referred to as a "normal" handover operation. In contrast, the operations ECM is performed in MTC UE 11 when it is necessary for the MTC UE 11, "ECM specific" cell select operation, "ECM specific" cell selection operation, and "ECM specific" handover operation, referred to as. ECM specific cell selection operation, ECM specific cell reselection operation, and ECM-specific handover operation, as compared to a cell that cell to support ECM (or eNB) does not support this (or eNB), MTC UE 11 stay it may be adjusted as likely to be selected as a target to be or handover to be (camp on).
[0035]
　Figure 2 is a flow chart showing an example of the operation of the MTC UE1 according to the present embodiment. In step S11, MTC UE 11 recognizes whether ECM is required in itself. As already mentioned, the (necessity of execution or ECM) necessity of ECM, may be determined by the MTC UE 11 itself, is notified to the MTC UE 11 from eNB13 after it is determined by eNB13 (instruction) it may be. When ECM is not needed at MTC UE 11 (NO at step S11), MTC UE 11 is normal cell selection operation, a cell reselection operation, or performing the handover operation (step S12). On the other hand, if at MTC UE 11 is required ECM (YES at step S12), MTC UE 11 may, ECM specific cell selection operation, a cell reselection operation, or performing the handover operation (step S13).
[0036]
　The procedure of FIG. 2 may be modified as follows. For example, whether or not in step S11, MTC UE 11 is at least one in ECM cells themselves stay (serving cell) (eg, cell 130) and peripheral cell (neighbouring cell) (eg, cell 140) is supported or you may recognize. When the cell (eg, cell 130) to which stays and its neighboring cells (eg, cell 140) does not support ECM together, MTC UE 11 is normal cell selection operation, a cell reselection operation, or it may be subjected to a handover operation. On the other hand, if the cell to which it stays (eg, cell 130) at least one of and its neighboring cells (eg, cell 140) supports ECM, MTC UE 11 may, ECM specific cell selection operation, a cell reselection operation, or it may be subjected to a handover operation.
[0037]
　According to the present embodiment, following effects are expected. That, MTC UE 11 according to this embodiment, ECM is depending on whether it is necessary for the MTC UE 11 itself, the cell selection operation, a cell reselection operation, and to change at least one of the handover operation. Alternatively, MTC UE 11, depending on whether its own cell to stay (eg, cell 130) and peripheral cell (eg, cell 140) at least one in the ECM is supported, the cell selection operation, a cell reselection operation, and to change at least one of the handover operation. Thus, MTC UE 11, if ECM is required to stay in the appropriate cells (eg, cells that support ECM, or cell excellent communication characteristics thanks to the coverage improvement process is expected by ECM) be able to.
[0038]
　Then hereinafter, ECM specific cell selection operation, ECM specific cell reselection operation, and a few specific examples of ECM-specific handover operation, several eNB (eNB13,14) operation to support this illustrating a specific example of.
[0039]
(First Example)
　In the first example, MTC UE 11 may, ECM specific operation (cell selection operation, a cell reselection operation, or handover operation) in each of the cells 130 and 140 (or eNB13 and 14) ECM to take into account whether or not the support. eNB13 and 14 each, in order to support the ECM specific operation in MTC UE 11, and transmits each notification indicating whether or not support ECM to the cell 130 and 140. MTC UE 11, for example, a notice indicating whether or not support ECM received from eNB13 and 14, a cell that supports ECM may be preferentially selected. Alternatively, MTC UE 11 receives the notification indicating whether support ECM from eNB13 and 14, a list of cells to be selected preferentially may report to the eNB13. In this case, eNB13, based on the cell list reported by the MTC UE 11, may select a cell to MTC UE 11 is to camp on.
[0040]
　Notification indicating whether the cell supports ECM has no radio connection with the eNB of (RRC connection), is preferably transmitted in receivable broadcast channels in other words idle MTC UE 11 . In other words, the notification is preferably MTC UE 11 is idle (RRC_IDLE) can be broadcast information received. Specifically, it is one of the LTE logical channel Broadcast Control Channel (BCCH) may be used for transmission of the information.
[0041]
　Here, describing the definition of idle and Connected state as used herein the term. An idle state is a state where the wireless connection is released between the UE and eNB. Thus, eNB has no information about the UE in an idle state (UE context). Location of the UE in the idle state, the location registration area in the core network (eg, tracking area or routing area) is grasped in units. The core network can be reached by paging the UE in an idle state. Further, UE in idle state can not perform a unicast data transfer between the eNB. Therefore, UE in an idle state must transition to Connected state in order to perform unicast data transfer. Examples of idle, (1) Universal Terrestrial Radio Access Network RRC in (UTRAN) idle state, (2) RRC_IDLE in Evolved UTRAN (E-UTRAN) state and, (3) WiMAX (IEEE 802.16-2004), Mobile WiMAX (IEEE 802.16e-2005), and a Idle state in WiMAX2 (IEEE 802.16m).
[0042]
　Connected state with respect to this is the state the UE has connected to the eNB. Thus, eNB holds information (UE Context) related to the UE Connected state. Location of the UE in the Connected state is grasped in the core network in a tracking area (TA) unit (or base station units). UE of Connected state, generally, it is possible to perform the unicast data transfer between the eNB. However, CELL_PCH state and URA_PCH state in the UTRAN, but the UE context is held by the base station control station (Radio Network Controler (RNC)), not assigned dedicated channel to the UE for both uplink and downlink it is a state. Examples of Connected state includes a Connected state in the RRC connected state, (2) RRC_CONNECTED state in E-UTRAN, and (3) WiMAX, Mobile WiMAX and WiMAX2 in (1) UTRAN. Incidentally, RRC the connected state in the UTRAN includes a CELL_DCH state, CELL_FACH state, CELL_PCH sate, and URA_PCH state.
[0043]
　Further by way, notification indicating whether the cell supports ECM is preferably sent in receivable broadcast channels even in the MTC UE 11 is idle (RCC_IDLE) and the detached state (EMM-DEREGISTERED). Detached state (EMM-DEREGISTERED) represents the EPS Mobility Management (EMM) state of the LTE. That is, the detached state (EMM-DEREGISTERED) is, UE core network (eg, EPC) have not been registered in the mobility management element in (eg, Mobility Management Entity (MME)), have been carried out mobility management of the UE It means there is no state. UE detached state, the position information in the MME is not grasped, not reachable by paging from a core network (EPC) (unreachable). UE detached state, in order to communicate, the initial cell selection (i.e., the initial cell search) is performed to establish a eNB and radio connection must be performed the location registration to the core network (EPC). Incidentally, BCCH can be received even in the MTC UE 11 is idle (RCC_IDLE) and the detached state (EMM-DEREGISTERED).
[0044]
　BCCH is mapped to a transport channel Broadcast Channel (BCH) or Downlink Shared Channel (DL-SCH). Furthermore, BCH the BCCH is mapped is transmitted from the eNB using the Physical Broadcast Channel (PBCH) which is a physical channel. PBCH is transmitted using a predetermined resource blocks of the first subframe of each radio frame is updated at 40 millisecond period (fourth radio frame periods). Broadcast information that is transmitted using the PBCH is a Master Information Block (MIB). Accordingly, the notification indicating whether the cell supports ECM may be included in the MIB.
[0045]
　On the other hand, DL-SCH which BCCH is mapped is transmitted from the eNB using a physical channel Physical Downlink Shared Channel (PDSCH). Normal applications of PDSCH is a transmission of user data, transmission of BCCH (i.e. broadcast information) is defined as one of the particular application (special the uses) the PDSCH. Resource blocks used for the BCCH (broadcast information) is represented by the Physical Downlink Control Channel (PDCCH) in the control message. Broadcast information that is transmitted using the PDSCH is a System Information Blocks (SIBs). Accordingly, the notification indicating whether the cell supports the ECM, either existing SIBs, may be included, for example, System Information Block Type 1 (SIB1). Further, the information is, M2M, MTC UE, or may be included in the newly defined SIB for ECM.
[0046]
　Notification indicating whether the cell supports the ECM, to the presence or absence of ECM Support of the cell 130 or 140 (or eNB13 or 14) may be explicitly indicated (eg, flag bit), implicitly it may indicate. Implicit information may include setting information for coverage improvement process in ECM (ECM radio resource configuration or ECM configuration).
[0047]
　ECM configuration or ECM configuration may include, for example, at least one of information shown below:
and setting information related to the reception of the broadcast information (PBCH),
settings for the reception of system information (System Information Block (SIB)) information,
setting information relating to the reception of the paging (paging Channel (PCH)),
the setting information concerning the reception of the & downlink control information (Physical downlink control Channel (PDCCH) ),
setting information related to the reception of, downlink data (PDSCH),
- uplink setting information on the transmission of control information (Physical uplink control Channel (PUCCH) ),
setting information relating to the transmission of the-uplink data (PUSCH),
setting related-radio quality measurement report (measurement report) information.
[0048]
　Setting information related to the reception of the setting information and the system information about the reception of the broadcast information (PBCH) (SIB), for example, which sub-frame and / or broadcast information and (what kind of) the system information in which OFDM symbols are transmitted repeatedly and either may be information that shows that. Setting information related to the reception of the paging may be, for example, information indicating which paging subframe is transmitted repeatedly. Or configuration information about the reception of the reception and downlink data (PDSCH) of the downlink control information (PDCCH), for example, may be information indicating whether they are transmitted many times repeatedly, it is repeatedly transmitted in every subframe it may be information that shows. Or configuration information about the transmission of the transmission and the uplink data (PUSCH) in the uplink control information (PUCCH) is, for example, may be information indicating whether they are transmitted many times repeatedly, it is repeatedly transmitted in every subframe it may be information that shows. Configuration information about the radio quality measurement report may be the offset value and the threshold for application to the radio quality of the measurement result (Measurement result) while running the ECM, the radio quality to be applied during execution of an ECM or an offset value or the threshold in the determination of the measurement result report.
[0049]
(Second Example)
　In the second embodiment, MTC UE 11 may, ECM specific cell selection operation, a cell reselection operation, and in each of the handover operation, the normal cell selection operation, a cell reselection operation, and handover operation and respectively using a common criteria (criterion). However, the value to be assigned to the first parameter included in the common criteria (i.e., cell selection parameters, the cell reselection parameters, or the handover parameters) differs between normal operation and ECM specific operation. For example, a second value to be substituted into the first parameter in the ECM specific operation, MTC UE 11 stay compared to cells cells that support ECM (or eNB) does not support this (or eNB) (camp it may be adjusted as likely to be selected as a target to be to or the handover on).
[0050]
　eNB13, both the second value to be substituted into the first parameter, the first value to be substituted into the first parameter in the normal operation, the ECM specific operation as shown in FIG. 3 a, it may notify the MTC UE11. In the example of FIG. 3, eNB13 are normal cell selection parameters (normal cell-reselection (CR) parameters) and in addition to the normal handover parameters (normal handover (HO) parameters), ECM specific cell selection parameters (ECM -specific CR parameters) and sends a normal handover parameters (ECM-specific HO parameters) (step S21). MTC UE 11 includes a normal cell selection and handover parameters, receives the cell selection and handover parameters ECM specific, use them for cell selection operation and handover operations in the MTC UE 11.
[0051]
　Common criteria cell selection operation may be an LTE cell selection criterion S (S-criterion ). S-criterion is defined in 3GPP TS 36.304 V9.11.0. In S-criterion, UE selects a cell in which both Srxlev and Squal is greater than 0 dB. Here, Srxlev and Squal is defined by the following (1) and (2) below.
[Number 1]

[0052]
　In the formula (1) and (2), Q Rxlevmeas is the received power level values of the measured cell. Q rxlevmin is a received power level value of the minimum cell required. Q Qualmeas is a reception quality value of the measured cell. Q qualmin is a reception quality value of the minimum cell required. Q Rxlevoffset and Q Qualoffset are offset Paramemeta to avoid the ping-pong in the cell selection. Pcompensation is, max (P EMAX - P Powerclass defined as 0). Here, P EMAX is the maximum transmit power level allowed for the UE in the cell. P Powerclass is the maximum transmit power level of the UE by the UE power class. eNB13, for example, Q Rxlevoffset or Q Qualoffset or value to be substituted into these both, may be different between the normal operation and ECM specific operation.
[0053]
　Common criteria cell reselection operation may be an LTE cell-ranking criterion R (R- criterion). R-criterion is defined in 3GPP TS 36.304 V9.11.0. In R-criterion, UE computes serving cell R metric (Rs) and the adjacent cell (neighbor cell) of R metric (Rn) in accordance with the following (3) and (4). R s and R n denotes the rank (ranking) of the serving cell and neighboring cells. UE selects the highest ranking cell.
[Number 2]

[0054]
　In (3) and (4), Q meas, s and Q meas, n is the measured quality of each serving cell and neighbor cells. Q Hyst, S is a hysteresis parameters that apply to the quality of the serving cell. Qoffset is the offset Paramemeta applied to the quality of the neighbor cell. Qoffset when serving and neighbor cell is the same frequency band (intra-frequency), Qoffset = Qoffset s, n is defined as. Qoffset s, n is an offset value applied to the combination of adjacent cell and the serving cell. Meanwhile, Qoffset, when the serving cell and the adjacent cells are different frequency bands (inter-frequency), Qoffset = Qoffset s, n + Qoffset freqency is defined as. Qoffset freqency is a frequency-specific offset (frequency-specific offset). eNB13, for example, Q hyst, s the value to be substituted into or Qoffset or both, it may be different between the normal operation and ECM specific operation.
[0055]
　Common criteria of the handover operation, the transmission condition of the handover request by the MTC UE 11, or handover may be transmitted condition measurement report that triggers the. More particularly, the common criteria of the handover operation may be an LTE measurement report triggering condition for Events A1 to A6. Measurement report triggering condition for Events A1 to A6 is the transmission conditions of the measurement report by the UE, it has been defined by 3GPP TS 36.331 V11.6.0. For example, the essential part of the Event A3 (Neighbour becomes offset better than serving) as defined measurement report event is represented by the following formula (5).
[Number 3]

[0056]
　(5) In the equation, Ms and Mn is the measured quality of each serving cell and neighbor cells. Ofs 及 Ofn are respectively serving cell and frequency specific offset of the neighbor cell (frequency-specific offset). Ofs 及 Ofn corresponds to "offsetFreq" defined by measObjectEUTRA information element (information element (IE)) within. Ocs 及 Ocn are respectively serving cell and cell-specific offset of the neighbor cell (cell-specific offset). Ocs and Ocn correspond to "cellIndividualOffset" defined by measObjectEUTRA information elements within. Hys is a hysteresis parameters for the Event A3. Hys corresponds to "hysteresis" as defined by reportConfigEUTRA information elements within. Off is the offset parameters for the Event A3. Off corresponds to the defined at reportConfigEUTRA information elements in "a3-Offset". eNB13, for example, Ofs, Ofn, Ocs, Ocn, Hys, or Off, or the value to be assigned to any combination thereof, may be different between the normal operation and ECM specific operation.
[0057]
(Third embodiment)
　In a third example, eNB13 will, ECM (i.e., coverage improvement process in ECM) cell reselection parameters or handover that is adjusted according to whether it is necessary for the MTC UE 11 • the parameters to notify the MTC UE11. MTC UE 11 has received from the eNB13, the adjusted cell reselection parameters or handover parameters were used in the reselection operation or handover operation ECM specific cell. Incidentally, of the third embodiment, MTC UE 11 is above normal first value and ECM specific second value both in that may not receive a for a particular cell reselection parameters or handover parameters it should be noted that different from the second embodiment.
[0058]
　For example, eNB13, if it is necessary ECM for MTC UE 11, to MTC UE 11 stays (camp on) as compared to cells cells that support ECM (or eNB) does not support this (or eNB) or may be adjusted cell selection parameter or handover parameters to be likely to be selected as a target to be a handover. For example, eNB13 is, Q are used in the above-described R-criterion hyst, s the value to be substituted for or Qoffset or both, it is adjusted depending on whether it is necessary ECM for MTC UE 11 it may be. Further, eNB13 the measurement report event (eg, Event A3) Ofs used to determine, Ofn, Ocs, Ocn, Hys, or Off, or the value to be assigned to any combination thereof, the MTC UE 11 it may be adjusted depending on whether the ECM is required for.
[0059]
　Figure 4 is a flowchart showing an example of the operation of the eNB13 regarding the third example. In step S31, ENB134 recognizes whether it is necessary to ECM for MTC UE 11 to stay in the cell 130. As already mentioned, the necessity of ECM (or necessity of execution of the ECM) may be determined by MTC UE 11, it may be determined by eNB13. eNB13 are explicitly or implicitly indicate the notification may be received from the MTC UE 11 that it or is running ECM is required in MTC UE 11. When ECM is not required for MTC UE 11 (NO at step S31), eNB13 is a normal cell selection parameter or both normal handover parameters or they notify the MTC UE 11 (step S32). On the other hand, if the ECM is required for the MTC UE 11 (YES at step S32), eNB13 is a handover parameter, or both are adjusted for coordinated cell selection parameter or ECM for ECM MTC UE 11 to notify the (step S33).
[0060]

　configuration example of a wireless communication system according to this embodiment may be the same as in FIG. 1 as described for the first embodiment. In the present embodiment, the first embodiment in the described ECM specific cell reselection operation, and an example of the ECM specific detailed instructions on handover operation is described.
[0061]
　MTC UE 21 according to this embodiment, receives a notification indicating whether ECM in each cell of eNB23 and 24 are supported from eNB23 and 24. Incidentally, for convenience of explanation, the cell eNB23 referred to as a first cell (Cell 1), referred to as a cell of eNB24 second cell (Cell 2). Then, MTC UE 21 may, ECM specific operation (cell selection operation, a cell reselection operation, or handover operation) in, whether each of the first and second cells (or eNB23 and 24) supports ECM consider.
[0062]
　Figure 5 is a sequence diagram showing an example of the operation of the MTC UE21, eNB23, and eNB24 according to the present embodiment. Incidentally, Figure 5 describes only messages necessary for explanation of this embodiment, it is omitted several messages included in the procedure defined in LTE. In the example of FIG. 5, the cell of eNB23 (Cell 1) are support ECM, cell eNB24 (Cell 2) it does not support ECM. MTC UE 21 determines whether it is necessary to ECM (or whether or not to execute the ECM) determines by itself for MTC UE 21, the cells that support the ECM when determining to perform the ECM (or selecting eNB) managing the cell priority.
[0063]
　In step S101, MTC UE 21 is idle as the initial state state (RRC_IDLE), based on the normal cell selection criterion determines to stay in the cells of ENB24 (second cell (Cell 2)) (Initially camp on Cell 2). In step S102, MTC UE 21 determines whether the ECM is required (ECM decision). MTC UE 21 may, for example, determination may be performed in step S102 while in idle state (RRC_IDLE). Further, MTC UE 21 periodically or non-periodic communication opportunities (e.g., periodic communication permission period, aperiodic generation of uplink transmission data or reception of paging) in response to arrives, step S102 of the judgment may be carried out.
[0064]
　MTC UE 21, when judging that it is necessary to ECM in step S102, checks whether ECM Stay cell (i.e. Cell 2) are supported. In step S103, MTC UE 21 recognizes that the ECM is not supported since at Cell 2 radio resource configuration information ECM (ECM radio resource configuration) is not broadcast (No System Information Block Type 1x). Therefore, MTC UE 21 checks whether ECM with neighboring cells (e.g., Cell 1) is supported (step S104). MTC UE 21 recognizes that the ECM from the radio resource configuration information of the ECM are broadcast at Cell 1 are supported (System Information Block Type 1x). In step S105, MTC UE 21 is to re-select a cell (Cell 1) in ENB23, to stay in Cell 1 (Cell reselect to Cell 1). In step S106, MTC UE 21 initiates execution of ECM (SECM start).
[0065]
　As understood from the above description, MTC UE 21, if ECM is required to select a cell that supports ECM preferentially. Accordingly, the communication characteristics of the MTC UE 21 is improved.
[0066]
　Here, an example of the ECM specific cell reselection operation at step S105 in FIG. 5. MTC UE21 is, if the cell you are currently staying (Cell 2) does not support ECM, which of the cells in the peripheral that supports the ECM and cell (Cell 2) that is currently staying (Cell 1) or to select may be determined according to any of the following. As an example, MTC UE 21, if the radio quality of the neighboring cell (Neighboring cell) which supports the ECM is good by a predetermined offset value than the radio quality of the stay cell (serving-cell), moves to the neighbor cells that support ECM ( cell re-selection). In another example, MTC UE 21 is smaller than the radio quality first predetermined threshold stay cell (serving-cell), the radio quality of the neighboring cell (Neighboring cell) of and supporting the ECM than the second predetermined threshold value If large, it moves to neighboring cells that support ECM (cell reselection).
[0067]
　Above offset value or threshold used for cell reselection, i.e. cell reselection parameters may be broadcast as system information (SIB) from ENB23, in MTC UE 21 as individual information (dedicated information) eNB23 it may be received from, or may be set in advance MTC UE 21.
[0068]
　For example, ENB23 may transmit a reselection parameters ECM specific cell in SIB 1x shown in step S104. ECM specific cell reselection parameters, e.g., CellReselectionInfoCommon contained in SIB3, cellReselectionServingFreqInfo, intraFreqCellReselectionInfo, q-QualMin, and threshServingLowQ, IntraFreqNeighCellInfo contained in SIB4, and also include at least one of InterFreqCarrierFreqInfo and InterFreqNeighCellInfo included in SIB5 good. eNB23 has a first value to be substituted into these cell reselection parameters in a normal cell reselection operation may transmit both the second value to be substituted into the ECM specific cell selection operation .
[0069]
　Further, specific examples of the determination of necessity ECM (coverage improvement process in the ECM) in step S102 in FIG. 5. Determining necessity of ECM in MTC UE 21 (coverage improvement process in the ECM), for example, access factor (Access cause) of MTC UE 21, terminal capability (UE capability data), the terminal information (UE information), communication characteristics (Communication performance ), and at least one may be performed in consideration of radio quality (radio quality).
[0070]
　Access factors, terminal capability, terminal information, described communication characteristics, and specific examples of the radio quality below. However, the access factor, terminal capability, terminal information, communication characteristics, and the contents of the radio quality is not limited to these examples.
[0071]
　Access factors may include, for example, at least one the following two of.
· RRC connection establishment of the purpose (Establishment Cause)
· type of service (Service type)
[0072]
　The purpose of the RRC connection establishment, for example, (a) emergency call (emergency), (b) high priority access (highPriorityAccess), (c) access for the terminal end communication (mt-Access), signaling by the terminal originating ( mo-Signalling), (d) the terminal transmitting the data transmission by (mo-data), (e) delay-insensitive access (delayTolerantAccess), (f) low priority access (lowPriorityAccess), (g) access for small data communication (smallDataAccess), (h) access for small packet communication (smallPacketAccess), (i) limited access (limitedAccess), (j) access for limited services (limitedService), (k) M2M-type access (m2mAccess), or (l) access by ECM (ecmAccess), may be specified.
[0073]
　Service type, for example, (a) real-time service may be designated non-real time service, or (c) M2M communication, (b).
[0074]
　Terminal capabilities may include, for example, at least one of the following three.
- radio access capability (Radio access capability data)
, device capability (Device capability data)
, the terminal category (UE category)
[0075]
　Whether the radio access capability, for example, supports (a) UE information indicating whether it supports the terminal function defined in 3GPP LTE (e.g. flag bit), or (b) UE is ECM information indicating whether may contain. To indicate whether the UE supports ECM, for example, "EcmSupport" that information element (Information Element (IE)) may be defined. For example, true value of "EcmSupport" is, ECM indicates that it is supported (the Supported), the false value is not ECM supports showing a (NotSupported). In addition, IE called "EnhancedCoverageMode" may be defined. For example, when the EcmSupport is set to the Supported, indicating that the UE supports ECM. Also, if the UE has not been support ECM, to EcmSupport may set a NotSupported, may indicate unsupported by the IE is not transmitted.
[0076]
　Device capabilities, for example, information indicating that (a) UE is MTC UE, (b) UE communication performance (usually compared to UE) information indicating that it is limited, or (c) a specific information indicating that performing only communication (e.g. M2M communication) may contain.
[0077]
　Terminal category, include information, which indicates one of (a) information indicating any of the terminal category defined by 3GPP LTE, or (b) access is defined in 3GPP LTE classes (Access Class) good. Terminal category or access classes may be newly defined for MTC UE performing M2M communication. For example, new categories for MTC UE which is function restriction to implement at a low cost (eg, category 0) is may be defined, only the communication or infrequent to assume that communicating infrequently allow access class (AC) may be newly defined.
[0078]
　Terminal information may include, for example, at least one of the following three.
- terminal type (UE type)
, device type (Device type)
, the terminal context (UE context)
[0079]
　Terminal type, for example, (a) UE information indicating which normal UE (non MTC UE) and MTC UE, the information (or UE indicating whether the moving (b) UE does not move information indicating that), or (c) information indicating whether there is a power supply to the UE (power supply), may contain.
[0080]
　Device type, for example, a, (a) information indicating the type of the UE implemented Operating System (OS), or (b) information indicating the type of M2M communication the UE performed (i.e., M2M sub-category information) it may also include a.
[0081]
　Terminal context, for example, (a) information of the above terminal capabilities, (b) set RRC control information to the UE (information contained in RadioResrouceConfigCommon IE and ArueiioResourceConfigDediacted IE, etc.), (c) information on the UE mobility (mobility information), indicating whether running ECM in (d) of the information indicating whether the UE is running ECM (ECM execution information), or (e) when the UE is the previous (e.g., last RRC_CONNECTED) information (ECM status information), may include a.
[0082]
　Communication characteristics may include, for example, at least one the following two of.
· Characteristic measurement results (Performance Measurement result (eg, L2 Measurement))
· communication statistics quality (Statistical communication quality (eg, KPI ))
[0083]
　Characteristic measurements, (a) the block error rate measurement (Block Error Rate), (b) packet error rate measurement results (Packet Error Rate), (c) Throughput measurement result (eg, Scheduled IP Throughput), (d) packet loss measurements (packet loss Rate), or may contain (e) a packet discard measurement results (packet discard Rate).
[0084]
　Communication statistics quality, for example, (a) a handover attempts or handover attempt rate, (b) a handover success rate or handover failure rates, (c) a communication distance or a communication frequency, (d) the packet generation intervals or packet occurrence frequency, ( e) packet arrival intervals (packet inter-arrival time) or packet arrival rate (packet inter-arrival rate), a, (f) access interval or access frequency, or (g) spacing or frequency of the RRC connection establishment or NAS connection establishment it may also include a.
[0085]
　Radio quality may include, for example, at least one the following two of.
And the reference signal reception quality (Reference Signal (RS) received The quality)
, channel quality indicator (CQI)
[0086]
　Reception quality of the reference signal (RS), for example, received power of the downlink RS in UE (RSRP), (b) the reception quality (RSRQ), or received signal strength (RSSI), may contain.
[0087]
　The operation to be performed with respect to ECM (i.e., control of the reception or transmission of MTC UE 21) may be defined by subdividing the previously multistage (multilevel). In this case, MTC UE 21 is not only determined whether the ECM is required (or whether or not to execute ECM), which step (level) operation is necessary or the (or any stage of operation determines whether to perform), the determined step (level) may be reported to ENB23. eNB23, based on the notification from the MTC UE 21, may be allowed operating phase of the reported ECM (level) from MTC UE 21, the different stages of the operation phase of the ECM reported from MTC UE 21 (level) determined, the determined step may notify the MTC UE 21. That, ENB23 may have the authority to finally determine the operating phase of the ECM should MTC UE 21 does.
[0088]
　Also, if the MTC UE 21 determines to execute the ECM, or when eNB23 determines that to perform the ECM to MTC UE 21, MTC UE 21 can be performed to continue ECM after it became RRC_IDLE from RRC_CONNECTED good. Further, MTC UE 21, when the MTC UE 21 determines to execute the ECM, or when eNB23 determines that to perform the ECM to MTC UE 21, to continue the ECM during performing delay-insensitive access (delay tolerant access) it may be executed.
[0089]
　Further, MTC UE 21, after judging whether ECM is required (or whether to perform ECM) First, whether to continue running, ECM based on communication characteristics or radio quality of its own it may be determined. For example, MTC UE 21 is block obtains an error rate or packet error rate, or both as the communication characteristics of the MTC UE 21, may be interrupted ECM if they were determined to be smaller than the predetermined threshold value (or discontinued). In combination or with which Alternatively, MTC UE 21 obtains the RSRP or RSRQ or both as radio quality may be interrupted ECM if they were determined to be greater than the predetermined threshold value (or discontinued) .
[0090]

　configuration example of a wireless communication system according to this embodiment may be the same as in FIG. 1 as described for the first embodiment. In the present embodiment, the first embodiment in the described ECM specific cell reselection operation, and an example of the ECM specific detailed instructions on handover operation is described.
[0091]
　eNB33 according to the embodiment determines whether to perform the ECM whether it is necessary to ECM, the other words MTC UE31 for MTC UE31. MTC UE31, when instructed to execute the ECM from ENB33, executes ECM specific cell reselection operation. ECM specific cell reselection operation of the present embodiment includes selecting a (eNB which manages or the cell) cells that support ECM preferentially. More specifically, after ECM specific cell reselection operation according to the present embodiment, which became in a cell that supports ECM from Connected state (RRC_CONNECTED) idle (RRC_IDLE), supports ECM to stay to continue to cell, including that it does not perform the re-selection of the other cells.
[0092]
　Figure 6 is a sequence diagram showing an example of the operation of the MTC UE31, eNB33, and eNB34 according to the present embodiment. Note that Figure 6 describes only messages necessary for explanation of this embodiment, it is omitted several messages included in the procedure defined in LTE. In the example of FIG. 6, the cells of eNB33 (Cell 1) are support ECM, cell eNB34 (Cell 2) does not support ECM.
[0093]
　In step S201, MTC UE31 are idle as the initial state state (RRC_IDLE), based on the normal cell selection criterion determines to stay in the cells of ENB34 (second cell (Cell 2)) (Initially camp on Cell 2). In step S202, MTC UE31 performs transmission and reception of messages required to attach to the network to complete the attach (Attach procedure on Cell 2). In step S203, ENB34 determines that to handover the MTC UE31 is Connected state (RRC_CONNECTED) to the cell (Cell 1) of eNB33, MTC UE31 will handover to Cell 1. MTC UE31, when radio resource configuration information for the ECM in Cell 1 (ECM radio resource config) is transmitted as the system information may be configured to receive the system information (step S204: System Information Block Type 1x).
[0094]
　In step S205, ENB33 is coverage improvement process is whether it is necessary to determine whether to execute the ECM to MTC UE31 other words (ECM decision) on ECM for MTC UE31. Figure 6 shows a case ECM is required for MTC UE31. Therefore, in step S206, ENB33 transmits ECM setting information (ECM configuration) in MTC UE31 (RRC Connection Reconfiguration). In step S206, ENB33 may include an explicit indication information to execute the ECM against MTC UE 21.
[0095]
　In step S207, MTC UE31 starts execution of the ECM according to radio resource configuration information and the ECM setting information (ECM start). In step S208, MTC UE31 performs data communication with the coverage improvement process in ECM (M2M data with ECM).
[0096]
　In step S209, ENB33 transmits an instruction for transferring the MTC UE31 to the idle state (RRC_IDLE) in MTC UE31 (RRC Connection Release). In response to this instruction, MTC UE31 is in the idle state (RRC_IDLE) from Connected state (RRC_CONNECTED). In step S210, MTC UE1 as reselection operation ECM specific cell, to stay continuously in the cell (Cell 1) of eNB33 supporting ECM (Keep camping on Cell 1). MTC UE31 may continue the ECM even after becoming the RRC_IDLE. Alternatively, MTC UE31 interrupts the ECM in RRC_IDLE, may reopen the ECM after becoming when or RRC_CONNECTED becomes RRC_CONNECTED.
[0097]
　As understood from the above description, MTC UE31, when instructed that the execution of the ECM is needed from ENB33, selects a cell that supports ECM preferentially. Accordingly, the communication characteristics of the MTC UE31 is improved.
[0098]

　configuration example of a wireless communication system according to this embodiment may be the same as in FIG. 1 as described for the first embodiment. In the present embodiment, the first embodiment in the described ECM specific cell reselection operation, and an example of the ECM specific detailed instructions on handover operation is described.
[0099]
　MTC UE 41 according to this embodiment, requests the eNB so as to stay preferentially to an appropriate cell among the cells that support ECM (or eNB that manages this). For example, MTC UE 41 selects at least one cell suitable to stay may send a list showing at least one appropriate cell eNB.
[0100]
　Figure 7 is a sequence diagram showing an example of the operation of the MTC UE41, eNB43, and eNB44 according to the present embodiment. Note that Figure 7 describes only messages necessary for explanation of this embodiment, it is omitted several messages included in the procedure defined in LTE. In the example of FIG. 7, both cells of eNB43 cell (Cell 1) and eNB44 (Cell 2) supports ECM. MTC UE 41 determines by itself whether it is necessary to ECM (or whether to perform ECM) for MTC UE 41.
[0101]
　In step S301, ENB43 transmits directly interface (X2 in interface) establishment request of the eNB44 (X2 Setup Request). In step S302, ENB44 transmits a response to X2 in interface established eNB43 (X2 Setup Response). Message transmitted in step S301 and S302, the information indicating that it supports the ECM (e.g., ECM supported The) may contain. Information indicating that it supports the ECM may be the eNB the unit may be a cell unit (i.e. serving cell units).
[0102]
　In step S303, MTC UE 41 is idle as the initial state state (RRC_IDLE), based on the normal cell selection criterion determines to stay in the cells of ENB43 (first cell (Cell 1)) (Initially camp on Cell 1). In step S304, MTC UE 41 makes a determination of whether or not it is necessary to perform the ECM (ECM decision). 6, ECM indicates the required case the MTC UE 41. Therefore, in step S305, MTC UE 41 initiates execution of ECM (ECM start). If radio resource configuration information for the ECM in the cell (Cell 1) stay to eNB43 (ECM radio resource configuration-1) is transmitted in the system information, MTC UE 41 receives the information in step S306 (System Information Block Type 1x).
[0103]
　In step S307, MTC UE 41 checks whether ECM with neighboring cells (e.g., eNB44 cell (Cell 2)) is supported. If radio resource configuration information for the ECM (ECM radio resource configuration-1) is transmitted in the system information in eNB44 cell (Cell 2), MTC UE41 may receive a corresponding information (System Information Block Type 1x). Alternatively, ENB43 is the list of neighboring cells to be transmitted to the MTC UE41 (Neighbour Cell List (NCL)), it may be added to one of the information ECM is supported. In this case, MTC UE 41 refers to the list of neighboring cells received from ENB43, it is possible to confirm whether ECM is supported by the peripheral cells.
[0104]
　MTC UE 41, the current serving cell (i.e., cell eNB43 (Cell 1)) determines the appropriate (preferred) cells not present in order to communicate while performing other in the ECM. If a suitable cell is present, MTC UE 41 uses a message indicating completion of establishment of the wireless connection (RRC connection), report the list of preferred cells to stay taken MTC UE 41 a (Preferred Cell List) to eNB43 (step S308: RRC Connection Setup Complete). List of preferred cells to stay (Preferred Cell List), for the identification of cells, cell identifiers (PCI or ECGI) or frequency information (EUTRA Absolute Radio Frequency Channel Number (EARFCN)) may include. Furthermore, the list of the cell may indicate a radio quality (RSRP or RSRQ) of each cell. MTC UE 41 may report the eNB43 using the message (RRC Connection Request) for a list of the cell requesting the establishment of a wireless connection.
[0105]
　eNB43 determines whether to handover the MTC UE 41 from MTC UE 41 receives a cell list (Preferred Cell List), the one of the cells that claim MTC UE 41 is preferred. Figure 7 shows a case where handover to a cell of eNB44 (Cell 2) are determined. Therefore, in step S309, ENB43 is to signal the eNB44 and MTC UE 41, for performing a handover of MTC UE41 (Handover to Cell2). In the handover procedure step S309, the serving eNB43 may notify information (ECM activated) to a target eNB44 indicating that the MTC UE 41 is performing the ECM.
[0106]
　In step S310, ENB44 transmits ECM setting information (ECM configuration) in MTC UE41 (RRC Connection Reconfiguration). Instead of the step S310, the during handover procedure in step S309, ENB44 is radio resource configuration information about Cell 2 including ECM setting information (ECM configuration) (Radio resource configuration) (also referred to as a Handover Command) to the eNB43 it may be sent. In this case, MTC UE 41 is the ECM configuration relating Cell 2 of ENB44, it received via the ENB43.
[0107]
　In step S311, MTC UE 41 in accordance with the radio resource configuration information and the ECM setting information, performs data communication with the coverage improvement process in ECM (M2M data with ECM).
[0108]
　As understood from the above description, MTC UE 41 reports the cell to support the preferred ECM for MTC UE 41 to the serving ENB43. Then, ENB43 performs a handover in order to stay MTC UE 41 in the preferred cell for MTC UE 41. Therefore, it can be expected that the communication characteristics of the MTC UE 41 is improved.
[0109]
　Here, the effective operation will be described in order to handover the MTC UE 41 in the cell claiming preferred MTC UE 41 shown in step S309 of FIG. eNB43 the report condition of the radio quality measurement report (Measurement report) (e.g., Event A3 or A5) on the applied offset value or threshold, that is, the handover parameters may be adjusted to ECM specific value. ECM specific handover parameters, for example, offset values ​​in the various events in the ReportConfigEUTRA information element (IE) (Events A1-A6) (e.g. a3-offset) and the threshold (e.g., a1-Threshold), and MeasObjectEUTRA information element (IE it may include at least one offset value (e.g. offsetFreq and cellIndividualOffset) included therein). eNB43 has a first value to be substituted into the handover parameters in normal handover operation may transmit both the second value to be substituted into the handover parameters in ECM specific handover operation. MTC UE 41, when executing the ECM, based on the ECM specific handover parameter (second value), may be carried out radio quality measurement report (Measurement report).
[0110]
　Figure 8 is a sequence diagram showing another example of the operation of the MTC UE41, eNB43, and eNB44 according to the present embodiment. In the example of FIG. 7 described above, ENB43, in order to stay MTC UE 41 in the preferred cell for MTC UE 41, to initiate a handover of the MTC UE 41. In contrast, in the example of FIG. 8, ENB43, in order to stay MTC UE 41 in the preferred cell for MTC UE 41, utilizes a cell reselection operation of MTC UE 41. Incidentally, Figure 8 describes only messages necessary for explanation of this embodiment, it is omitted several messages included in the procedure defined in LTE. In the example of FIG. 8, both cells of eNB43 cell (Cell 1) and eNB44 (Cell 2) supports ECM.
[0111]
　Processing in steps S401 ~ S408 in FIG. 8 is the same as the processing in steps S301 ~ S308 in FIG. In step S409, ENB43 transmits ECM setting information (ECM configuration) in MTC UE41 (RRC Connection Reconfiguration). In step S410, MTC UE 41 in accordance with the radio resource configuration information and the ECM setting information, performs data communication with the coverage improvement process in ECM (M2M data with ECM).
[0112]
　In step S411, ENB43 sends a release indication in the radio connection (RRC connection) to MTC UE41 (RRC Connection Release). Instruction step S411, the other cells that support is preferably ECM to stay taking the MTC UE2 (e.g., cells of eNB44 (Cell 2)) information about the preference for (e.g., Dedicated cell priority for Cell 2) also include good. Information about the priority, for example, MTC UE 41 is may be information indicating a selection preferentially a predetermined cell or frequency when performing cell reselection, the information indicating that always selecting a predetermined cell or frequency But good. Alternatively, information regarding the priority may indicate a cell reselection parameters to be applied to a given cell or frequency. Furthermore, information on the priority only if the MTC UE 41 is performing the ECM, only to stay in the cell MTC UE 41 supports ECM, or only if the MTC UE 41 stays in the cell that does not support ECM, etc. it may be selectively used in certain circumstances.
[0113]
　In step S412, MTC UE 41 performs a cell reselection in the idle state (RRC_IDLE), to change the cell to stay in the cell (Cell 2) of eNB44 (Cell reselect to Cell 2).
[0114]
　As understood from the above description, MTC UE 41 reports the cell to support the preferred ECM for MTC UE 41 to the serving ENB43. Then, ENB43, in order to stay MTC UE 41 in the preferred cell for MTC UE 41, to control the cell reselection behavior of MTC UE 41. Therefore, it can be expected that the communication characteristics of the MTC UE 41 is improved.
[0115]

　configuration example of a wireless communication system according to this embodiment may be the same as in FIG. 1 as described for the first embodiment. In the present embodiment, the first embodiment in the described ECM specific cell reselection operation, and an example of the ECM specific detailed instructions on handover operation is described.
[0116]
　MTC UE51 according to the present embodiment, when executing the ECM, to change the cell to stay in the case and the Connected a state (RC_CONNECTED) when in an idle state (RRC_IDLE).
[0117]
　Figure 9 is a sequence diagram showing an example of the operation of the MTC UE51, eNB53, and eNB54 according to the present embodiment. Incidentally, Figure 9 describes only messages necessary for explanation of this embodiment, it is omitted several messages included in the procedure defined in LTE. In the example of FIG. 9, the cell of eNB53 (Cell 1) are support ECM, cell eNB54 (Cell 2) it does not support ECM. MTC UE51 determines itself whether or not it is necessary to ECM (or whether to perform ECM) for MTC UE51. Then, it is determined to execute the ECM, and in situations where Connected state (RC_CONNECTED), MTC UE51 selects (eNB which manages or the cell) cells that support ECM preferentially.
[0118]
　In step S501, MTC UE51 are idle as the initial state state (RRC_IDLE), based on the normal cell selection criterion determines to stay in the cells of ENB54 (second cell (Cell 2)) (Initially camp on Cell 2). In step S502, MTC UE51 determines whether ECM is required (ECM decision). In the example of FIG. 9, MTC UE51 makes a determination in step S502 while in idle state (RRC_IDLE). However, MTC UE51 is periodic or aperiodic communication opportunities (e.g., periodic communication permission period, aperiodic generation of uplink transmission data or reception of paging) in response to arrives, step S502 of the judgment may be carried out.
[0119]
　MTC UE51, when judging that it is necessary to ECM in step S502, checks whether ECM Stay cell (i.e. Cell 2) are supported. In step S503, MTC UE51 recognizes that ECM is not supported since at Cell 2 radio resource configuration information ECM (ECM radio resource configuration) is not broadcast (No System Information Block Type 1x). Therefore, MTC UE51 checks whether ECM with neighboring cells (e.g., Cell 1) is supported (step S504).
[0120]
　In step S505, the uplink data occurs to be transmitted. In other words, the uplink data to be transmitted arrives at MTC UE51 (UL data arrives). In response to the occurrence of the uplink data, in step S506, MTC UE51 is, Cell 1 (or other cells that support ECM) and cell reselection support ECM. In step S507, MTC UE51 starts executing the ECM. Note that step S505 may be different from transmission opportunity to the generation of the uplink data (e.g., arrival of periodic communication permission period, or paging receiver).
[0121]
　In step S508, MTC UE51 is received or sent from a wireless connection eNB53 messages for the establishment of (RRC connection), finally sends a completion message indicating the establishment completion of wireless connection (RRC Connection Setup Complete). Completion message in step S508, information indicating that the MTC UE51 is running ECM (e.g., ECM activated) may contain.
[0122]
　In step S509, eNB53 will, MTC UE51 is in response to receiving a completion message in step S508 indicating that running ECM, transmits ECM setting information (ECM configuration) in MTC UE51 (RRC Connection Reconfiguration). In step S510, MTC UE51 according radio resource configuration information and the ECM setting information, performs data communication with the coverage improvement process in ECM (M2M data with ECM). Prior to the transmission of the ECM setting information in step S509 (ECM configuration), eNB53 may determine whether ECM is really necessary for the MTC UE51. That, ENB53 verifies the validity of the ECM necessity determination in MTC UE51, may cancel the decision not valid.
[0123]
　In step S511, ENB53 transmits to transfer the MTC UE51 to the idle state (RRC_IDLE) a release instruction of the radio connection (RRC connection) to MTC UE51 (RRC Connection Release). In step S512, MTC UE51 is in an idle state (RRC_IDLE), and re-select a cell (Cell 2) of eNB54 (Cell reselect to Cell 2). In step S513, MTC UE51 will interrupt the execution of the ECM (or stop) to (ECM stop).
[0124]
　MTC UE51, without starting the ECM at the time of step S507, the may start an ECM after receiving the ECM setting information (ECM configuration) in step S509. In this case, completion message in step S508, the notification indicating that the ECM is required (e.g., ECM request) may contain.
[0125]
　As understood from the above description, MTC UE51, when a and Connected state must perform the ECM (RRC_CONNECTED), and re-select a cell that supports ECM. Accordingly, the communication characteristics in particular Connected state of the MTC UE51 is improved.
[0126]
　Figure 10 is a sequence diagram showing another example of the operation of the MTC UE51, eNB53, and eNB54 according to the present embodiment. In the example of FIG. 9 described above, whether it is necessary to ECM determines MTC UE51 themselves for MTC UE51. In contrast, in the example of FIG. 10, it determines the eNB53 whether or not it is necessary to ECM for MTC UE51. Incidentally, FIG. 10 is described only messages necessary for explanation of this embodiment, it is omitted several messages included in the procedure defined in LTE. In the example of FIG. 10, cell eNB53 (Cell 1) are support ECM, cell eNB54 (Cell 2) does not support ECM.
[0127]
　Processing in steps S601 ~ S606 in FIG. 10 is the same as the processing in steps S501 ~ S506 in FIG. In step S607, MTC UE51 is received or sent from a wireless connection eNB53 messages for the establishment of (RRC connection), finally sends a completion message indicating the establishment completion of wireless connection (RRC Connection Setup Complete). Completion message in step S607, the notification indicating that the ECM is required in MTC UE51 (e.g., ECM request) may contain.
[0128]
　In step S608, eNB53 is, (ECM decision) determines whether it is necessary to ECM (or whether to execute the ECM to MTC UE51) for MTC UE51. Figure 10 shows a case ECM is required for MTC UE51. Therefore, in step S609, ENB53 transmits ECM setting information (ECM configuration) in MTC UE51 (RRC Connection Reconfiguration).
[0129]
　In step S610, MTC UE51 starts execution of the ECM according to radio resource configuration information and the ECM setting information (ECM start). In step S611, MTC UE51 performs data communication with the coverage improvement process in ECM (M2M data with ECM).
[0130]
　In step S612, ENB53 transmits to transfer the MTC UE51 to the idle state (RRC_IDLE) a release instruction of the radio connection (RRC connection) to MTC UE51 (RRC Connection Release). In step S613, MTC UE51 is in an idle state (RRC_IDLE), and re-select a cell (Cell 2) of eNB54 (Cell reselect to Cell 2). In step S614, MTC UE51 will interrupt the execution of the ECM (or stop) to (ECM stop).
[0131]
　By the procedure of FIG. 10, similarly to the procedure of FIG. 9, MTC UE51 when need to perform ECM there and a Connected state (RRC_CONNECTED), and re-select a cell that supports ECM. Accordingly, the communication characteristics in particular Connected state of the MTC UE51 is improved.
[0132]

　configuration example of a wireless communication system according to this embodiment may be the same as in FIG. 1 as described for the first embodiment. In the present embodiment, the first embodiment in the described ECM specific cell reselection operation, and an example of the ECM specific detailed instructions on handover operation is described.
[0133]
　Or MTC UE 61 according to the present embodiment, at least one in ECM cells themselves stay (serving cell) (eg, eNB63 cells) and peripheral cell (neighbouring cell) (eg, eNB64 cell) is supported depending on whether the cell selection operation, a cell reselection operation, and to change at least one of the handover operation. That is, in this embodiment, the possible ECM is required for MTC UE 61 is determined in MTC UE 61 or eNB (eNB64 or 65), the cell selection operation in MTC UE 61, the cell reselection operation, and handover operation not an essential condition for changing the at least one of the.
[0134]
　Figure 11 is a sequence diagram showing an example of the operation of the MTC UE61, eNB63, and eNB64 according to the present embodiment. Incidentally, Figure 11 describes only messages necessary for explanation of this embodiment, it is omitted several messages included in the procedure defined in LTE. In the example of FIG. 11, cell eNB63 (Cell 1) are support ECM, cell eNB64 (Cell 2) does not support ECM.
[0135]
　In step S701, MTC UE 61 is idle as the initial state state (RRC_IDLE), based on the normal cell selection criterion determines to stay in the cells of ENB64 (second cell (Cell 2)) (Initially camp on Cell 2).
[0136]
　In step S702, MTC UE 61 is (cell (Cell 2 of eNB64)) cell itself is staying ECM to confirm whether or not supported by. MTC UE 61 recognizes that the ECM is not supported since at Cell 2 radio resource configuration information ECM (ECM radio resource configuration) is not broadcast (No System Information Block Type 1x). Therefore, in step S703, MTC UE 61 checks whether ECM with neighboring cells (e.g., cells of eNB63 (Cell 1)) is supported. MTC UE 61 recognizes that the ECM from the radio resource configuration information of the ECM are broadcast at Cell 1 are supported (System Information Block Type 1x).
[0137]
　In step S704, MTC UE 61, in response to recognizing the neighboring cell (Cell 1) that supports ECM, starts cell reselection operation in consideration of ECM (ECM specific cell reselection operation). In step S705, MTC UE 61 evaluates cell reselection criteria. Note that steps S704 and ECM specific cell reselection operation performed in step S705 may be any of the first to third examples described in the first embodiment. Then, in step S706, the result of the ECM specific cell reselection operation, MTC UE 61 re-select a cell (Cell 1) the ENB63.
[0138]
　As understood from the above description, MTC UE 61, when its at least one in the ECM of the cell to stay (eg, eNB63 cells) and peripheral cell (eg, eNB64 cells) are supported, ECM specific cell selection operation, a cell reselection operation, and at least one of a handover operation performed. MTC UE61 that support ECM, regardless of whether or not the execution of the ECM is in fact necessary, is better staying in a cell that support ECM is expected to be advantageous. This is because, when the radio quality or the communication characteristic of the MTC UE 61 is deteriorated, because immediately can start ECM. Operations described in this embodiment can contribute to MTC UE 61 to support the ECM is to stay in the appropriate cell (eg, cell supporting ECM).
[0139]
　Finally MTC UE and an example of the configuration of the eNB will be described according to the above-described embodiment. Each MTC UE11,21,31,41,51, and 61 described in the first to sixth embodiments, the transceiver for communicating with eNB, and may also include a controller coupled to the transceiver. The controller performs communication control relating to ECM by MTC UE11,21,31,41,51, or 61 described in the first to fifth embodiments.
[0140]
　eNB13,14,23,24,33,34,43,44,53,54,63 described in the first to sixth embodiments, and each 64 communicates with a plurality of UE including MTC UE transceiver for, and may include a controller coupled to the transceiver. The controller performs communication control relating to ECM by eNB13,14,23,24,33,34,43,44,53,54,63 or 64, which is described in the first to fourth embodiments.
[0141]
　12 and FIG. 13 is a block diagram showing a configuration example of a MTC UE 11 and eNB13 according to the first embodiment. Referring to FIG. 12, MTC UE 11 includes a transceiver 111 and a controller 112. The transceiver 111 is configured to communicate with eNB13. The controller 112 in accordance with an instruction from the eNB13, is configured to control the execution of coverage improvement process related ECM in MTC UE 11. Specifically, controller 112, depending on whether it is necessary for the MTC UE 11 (coverage improvement process in the ECM) ECM, cell selection operation, a cell reselection operation, and at least one of the handover operation It is configured to change.
[0142]
　Referring to FIG. 13, eNB13 includes a transceiver 131 and a controller 132. The transceiver 131 is configured to communicate with a plurality of UE including MTC UE 11 and the normal UE 12. The controller 132 is configured to control the communication with the coverage improvement process related ECM between MTC UE1 and eNB13. Specifically, the controller 132, as ECM cell selecting operation of the MTC UE 11 depending on whether it is necessary for the MTC UE 11, the cell reselection operation, and the handover operation at least one is changed It is configured to support the MTC UE 11.
[0143]
　Each controller having the MTC UE and eNB according to the embodiment described above, at least one processor by causing a computer to execute a program containing a (eg microprocessor, Micro Processing Unit (MPU), Central Processing Unit (CPU)) it may be realized. Specifically, it may be supplied to one or more program including instructions for causing algorithms for MTC UE and eNB that is described with reference to a sequence diagram or the like to the computer.
[0144]
　This program is stored using a non-transitory computer readable media of various types (non-transitory computer readable medium), it can be supplied to the computer. Non-transitory computer readable media include with various types of entities (tangible storage medium). Examples of non-transitory computer readable media include magnetic storage media (such as floppy disks, magnetic tape, hard disk drive), magneto-optical recording medium (e.g., magneto-optical disk), Compact Disc Read Only Memory (CD-ROM), CD- R, including CD-R / W, a semiconductor memory (e.g., a mask ROM, Programmable ROM (PROM), Erasable PROM (EPROM), flash ROM, Random Access memory (RAM)). The program may be provided to a computer using a temporary computer readable media of various types (transitory computer readable medium). Examples of transitory computer readable media include electric signals, optical signals, and electromagnetic waves. Transitory computer readable media, wired communication path such as electrical wires and optical fibers, or via a wireless communication path can provide the program to a computer.
[0145]

　In the above embodiments, a special operation mode in MTC UE, i.e. set Enhanced Coverage Mode (ECM) is, ECM coverage improvement process related (eg, repetition of RACH, repetition of PDSCH / PUSCH) is It is described on the assumption that performed in MTC UE. However, MTC UE is special coverage improvement process (eg, repetition of RACH, repetition of PDSCH / PUSCH) may be composed to be able to perform the, be set to a special operating mode (i.e., ECM) is it is not always necessary. In other words, MTC UE11,21,31,41, and 51, without setting a special operating mode such as ECM, or without being instructed special operation mode, special by performing radio resource configuration a coverage improvement process (eg, repetition of RACH, repetition of PDSCH / PUSCH) may be performed.
[0146]
　Further, although the above embodiment has been assumed the ECM, techniques idea described in these embodiments, any special processing that is different from the ECM to the wireless network (e.g. eNB) is M2M terminal (MTC UE) it may be applied to a case of executing.
[0147]
　Further, in the above embodiment has been described an ordinary terminal (UE) and M2M terminal (MTC UE) as an example, also called respectively the user terminal (user terminal Enter) and the non-user terminal (non-user terminal).
[0148]
　Further, in the embodiment described above, it has been described primarily in the context of a LTE system. However, these embodiments, wireless communication systems other than the LTE system, for example, 3GPP UMTS, 3GPP2 CDMA2000 systems (1xRTT, HRPD), may be applied GSM / GPRS system, or WiMAX system or the like.
[0149]
　If the above-described embodiment is applied to a 3GPP UMTS, the operation of the eNB (eNB13,14,23,24,33,34,43,44,53,54,63, or 64) in the above embodiment, NodeB or it may be performed by the RNC, or a combination thereof. In other words, the term base station as used in the specification and claims, means one or more entities are arranged in a radio access network, a NodeB or RNC or a combination of these UMTS in one example means.
[0150]
　Furthermore, the above-described embodiments are only examples for the application of technical ideas obtained by the present inventor. In other words, the technical idea is not limited to the embodiments described above, it is needless to say various modifications are possible.
[0151]
　This application claims priority based on Japanese Patent Application No. 2014-015867, filed on January 30, 2014, the entire disclosure of which is incorporated herein.
DESCRIPTION OF SYMBOLS
[0152]
11, 21, 31, 41 M2M terminal (MTC
UE) 13,14,23,24,33,34,43,44 base station
(eNB) 15 Core Network
(EPC) 130 cell
140 cell
111 transceiver
112 controller
131 transceiver
132 controller

WE CLAIM

A M2M terminal for Machine-to-machine (M2M) communication,
　a wireless communication means for communicating with a base station,
　depending on whether it is necessary to predetermined coverage improvement processing, or the M2M terminal stays depending on whether the coverage improvement process at least one cell and its neighboring cell is supported, the cell selection operation, a cell reselection operation, and a control means for changing at least one of the handover operation,
comprising a M2M terminal.
[Requested item 2]
　Wherein,
　when the not required predetermined coverage improvement process, or when said stay cell and the peripheral cell does not support both the coverage improvement process, the first cell selection operation, the first cell reselection operation, or performing a first handover operation,
　when the it is necessary predetermined coverage improvement process, or the case where at least one of the stays cells and the surrounding cell supports the coverage improvement process to, performs the predetermined second cell selection operations cell or base station to support coverage improvement process is adjusted as likely to be selected, a second cell reselection operation, or a second handover operation,
claim M2M terminal according to 1.
[Requested item 3]
　The second cell selection operation, the second cell reselection operation, and at least one of the second handover operation, the notification indicating whether the predetermined coverage improvement process is supported at the base station the comprises considered received from the base station, M2M terminal according to claim 2.
[Requested item 4]
　The second cell reselection operation, the first cell reselection operation and is using a common criteria (criterion), a first parameter included in the criterion in the second cell reselection operation second value, wherein in the first cell reselection operation different from the first value assigned to the first parameter, M2M terminal according to claim 2 or 3 to be substituted for.
[Requested item 5]
　The second handover operation is to use the first handover operation common criteria (criterion), the second to be assigned to the first parameter included in the criterion in the second handover operation the value, the difference from the first first value is assigned to the first parameter in the handover operation, M2M terminal according to claim 2 or 3.
[Requested item 6]
　The second value is the compared to the first value, the predetermined cell or base station to support coverage improvement process is adjusted so as to be easily selected, M2M terminal according to claim 4 or 5 .
[Requested item 7]
　The first parameter is an offset parameter that acts on the quality of the serving cell, the offset parameter that acts on the adjacent cell individual quality, and of the hysteresis parameter for difficult to easily or established satisfied the criteria at least including one 1, M2M terminal according to any one of claims 4-6.
[Requested item 8]
　It said control means, M2M terminal according to any one of claims 4-7 for receiving said first and second values ​​from the base station.
[Requested item 9]
　The second cell reselection operation, to the M2M terminal remains in the cell to support the given coverage improvement process includes not performing cell reselection in the M2M terminal, M2M according to claim 2 terminal.
[Requested item 10]
　Wherein the control means receives an indication not to perform the cell reselection in the M2M terminal from the base station, M2M terminal according to claim 9.
[Requested item 11]
　It said control means receives the instruction in dedicated signaling between the base station the M2M terminal, M2M terminal according to claim 10.
[Requested item 12]
　The dedicated signaling comprises a Radio Resource Connection (RRC) Release message, M2M terminal according to claim 11.
[Requested item 13]
　When the second cell reselection operation is the Connected state and the cell M2M terminal to stay, where the wireless connection is established while remain idle does not have a wireless connection with a base station the M2M terminal comprises independently selected cells to stay, M2M terminal according to claim 2 in.
[Requested item 14]
　The second cell reselection operation,
　while the M2M terminal remains in the idle state, selecting a cell to stay without considering whether the predetermined coverage improvement process is supported, and
　wherein when the M2M device is made from the idle state for data communication to Connected state, to reselect a cell to support the given coverage process,
including,
M2M terminal according to claim 2.
[Requested item 15]
　The second handover operation, the transmission condition of a handover request or transmission conditions of measurement report triggering a handover is different from the first handover operation, M2M terminal according to any one of claims 2-14.
[Requested item 16]
　Wherein the predetermined coverage improvement process includes a process performed by a wireless terminal supporting Enhanced Coverage Mode (ECM), M2M terminal according to any one of claims 1 to 15.
[Requested item 17]
　Wherein the predetermined coverage improvement process, (a) Physical Broadcast Channel (PBCH) by repeating extra than normal transmission of broadcast information, (b) Physical Random Access Channel (PRACH) repeating the transmission of the preamble by a predetermined number of times , that, and (d) that repeatedly transmits the Physical Downlink Shared Channel (PDSCH) over a plurality of sub-frames, at least one of which repeatedly transmits (c) Physical Uplink Shared Channel over multiple sub-frames (PUSCH) including, M2M terminal according to any one of claims 1 to 16.
[Requested item 18]
　A wireless communication means for communicating with Machine-to-machine (M2M) device,
　depending on whether it is necessary for a given coverage improvement process of the M2M terminal, or cell and its peripheral the M2M terminal stays depending on whether the coverage improvement process at least one cell is supported, the M2M terminal cell selection operation by the cell reselection operation, and supporting the M2M terminal to at least one of the change of the handover operation and control means for,
base station apparatus comprising a.
[Requested item 19]
　That said support includes transmitting a notification indicating that the predetermined coverage improvement process is supported in the cell of the base station device to the M2M terminal, a base station apparatus according to claim 18.
[Requested item 20]
　That the support comprises notifying the first and second value assigned to the first parameter used by the M2M terminal for cell reselection or handover to the M2M terminal,
　said first the value, when the predetermined coverage improvement process is not necessary for the M2M terminal is used in the M2M terminal,
　the second value, the predetermined coverage improvement process is required for the M2M terminal If it is used in the M2M terminal,
a base station apparatus according to claim 18 or 19.
[Requested item 21]
　The second value is the compared to the first value, the predetermined cell or base station to support coverage improvement process is adjusted so as likely to be selected, the base station apparatus according to claim 20.
[Requested item 22]
　The first parameter, established cell offset parameter acting on individual quality, an offset parameter that acts on the quality of the serving cell, the offset parameter acting on the adjacent cell individual quality, and cell reselection criteria or handover criterion at least one containing, base station apparatus according to claim 20 or 21 out of easy or established hardly hysteresis parameters for.
[Requested item 23]
　That said support comprises a predetermined coverage improvement process is the M2M depending on whether it is necessary for the terminal to adjust the cell reselection parameters or handover parameters are notified to the M2M terminal the base station apparatus according to claim 18 or 19.
[Requested item 24]
　The support that is to comprises instructing the cell reselection criteria specific to when the predetermined coverage improvement process is necessary to the M2M terminal, a base station apparatus according to claim 18 or 19.
[Requested item 25]
　The specific cell reselection criteria, in order to stay the M2M terminal in the cell to support the given coverage improvement process involves not performing cell reselection to the M2M terminal, a base of claim 24 office equipment.
[Requested item 26]
　Wherein said control means transmits the instruction in dedicated signaling between the base station apparatus the M2M terminal to the M2M terminal, a base station apparatus according to claim 25.
[Requested item 27]
　The dedicated signaling comprises a Radio Resource Connection (RRC) Release message, the base station apparatus according to claim 26.
[Requested item 28]
　A Machine-to-machine (M2M) method performed by M2M terminal performing communication,
　predetermined coverage improvement process depending on whether it is necessary for the M2M terminal, or the M2M terminal stays depending on whether the coverage improvement process at least one cell and its neighboring cells is supported comprises the cell selection operation, a cell reselection operation, and changing at least one of the handover operation, method.
[Requested item 29]
　A Machine-to-machine (M2M) method performed by a base station that communicates with the terminals and
　the predetermined coverage improvement process depending on whether it is necessary for the M2M terminal, or the M2M terminal stay the coverage improvement process at least one cell and its neighboring cells to depending on whether the supported, the M2M cell selecting operation by the terminal, so that the cell reselection operation, and at least one of a handover operation is changed comprising at supporting the M2M terminal method.
[Requested item 30]
　A Machine-to-machine (M2M) non-transitory computer readable medium storing a program for causing the method to the computer about the M2M terminal that performs communication,
　the method comprising the predetermined coverage improvement process is the M2M terminal depending on whether it is necessary for, or the M2M depending on whether the terminal is the coverage improvement process at least one cell and its neighboring cells to stay is supported, the cell selection operation, re-cell selection operation, and a changing at least one of the handover operation,
the non-transitory computer readable media.
[Requested item 31]
　The non-transitory computer readable medium storing a program for causing a process for Machine-to-machine (M2M) base station that communicates with the terminals to the computer,
　the method comprising the predetermined coverage improvement process is the M2M depending on whether it is necessary for the terminal, or the coverage improvement process at least one of the M2M terminal cell and its surrounding cells to stay depending on whether it is supported, the cell according to the M2M terminal selection operation, a cell reselection operation, and at least one handover operation comprises at supporting the M2M terminal to be changed,
a non-transitory computer readable media.
[Requested item 32]
　A M2M terminal for Machine-to-machine (M2M) communications,
　wherein a base station that communicates with M2M terminal,
provided with a,
　whether it is necessary for the M2M terminal, predetermined coverage improvement process is the M2M terminal or in response to, or the M2M depending on whether the terminal is the coverage improvement process at least one cell and its neighboring cells to stay is supported, the cell selection operation, a cell reselection operation, and at least a handover operation is configured to change one,
　the base station, the predetermined coverage improvement process depending on whether it is necessary for the M2M terminal, or at least one of the stays cells and the surrounding cell depending on whether the coverage improvement process is supported, the cell selection operation, the cell reselection operation, and such that at least one is changed in the handover operation It is configured to support serial M2M terminal,
a wireless communication system.
[Requested item 33]
　A M2M terminal for Machine-to-machine (M2M) communication,
　a wireless communication means for communicating with a base station,
　the first and second is assigned to the first parameter used for cell reselection or handover and control means for receiving a value of 2 from the base station,
comprising a
　first value, when the predetermined coverage improvement process is not necessary for the M2M terminal, the first parameter in the control means is assigned to,
　the second value, the predetermined coverage improvement process when it is necessary for the M2M terminal, is assigned to the first parameter in the control means,
M2M terminal.
[Requested item 34]
　The second value is the compared to the first value, the predetermined cell or base station to support coverage improvement process is adjusted so as to be easily selected, M2M terminal according to claim 33.
[Requested item 35]
　The first parameter, established cell offset parameter acting on individual quality, an offset parameter that acts on the quality of the serving cell, the offset parameter acting on the adjacent cell individual quality, and cell reselection criteria or handover criterion at least one containing, M2M terminal according to claim 33 or 34 out of easy or established hardly hysteresis parameters for.
[Requested item 36]
　Wherein the predetermined coverage improvement process includes a process performed by a wireless terminal supporting Enhanced Coverage Mode (ECM), M2M terminal according to any one of claims 33-35.
[Requested item 37]
　Wherein the predetermined coverage improvement process, (a) Physical Broadcast Channel (PBCH) by repeating extra than normal transmission of broadcast information, (b) Physical Random Access Channel (PRACH) repeating the transmission of the preamble by a predetermined number of times , that, and (d) that repeatedly transmits the Physical Downlink Shared Channel (PDSCH) over a plurality of sub-frames, at least one of which repeatedly transmits (c) Physical Uplink Shared Channel over multiple sub-frames (PUSCH) including, M2M terminal according to any one of claims 33-36.
[Requested item 38]
　Machine-to-machine (M2M) wireless communication means for communicating with the terminals and
　the first and second values to be substituted for cell reselection or handover to the first parameter used by the M2M terminal M2M and control means for notifying the terminal,
comprising a
　first value, when the predetermined coverage improvement process is not necessary for the M2M terminal, is assigned to the first parameter in the M2M terminal,
　said first 2 values, said predetermined when the coverage improvement process is necessary for the M2M terminal, wherein the M2M terminal is assigned to the first parameter,
the base station apparatus.
[Requested item 39]
　The second value is the compared to the first value, the predetermined cell or base station to support coverage improvement process is adjusted so as likely to be selected, the base station apparatus according to claim 38.
[Requested item 40]
　The first parameter, established cell offset parameter acting on individual quality, an offset parameter that acts on the quality of the serving cell, the offset parameter acting on the adjacent cell individual quality, and cell reselection criteria or handover criterion at least one containing, base station apparatus according to claim 38 or 39 out of easy or established hardly hysteresis parameters for.
[Requested item 41]
　A Machine-to-machine (M2M) method performed by M2M terminal performing communication,
　the base station first and second value assigned to the first parameter used for cell reselection or handover comprises receiving from
　the first value, when the predetermined coverage improvement process is not necessary for the M2M terminal, is assigned to the first parameter in the M2M terminal,
　the second value , wherein when a predetermined coverage improvement process is necessary for the M2M terminal, is assigned to the first parameter in the M2M terminal,
method.
[Requested item 42]
　Machine-to-machine (M2M) A method performed by a base station that communicates with the terminals and
　the first and second to be assigned to the first parameter used for cell reselection or handover by the M2M terminal provided that notifies the value to the M2M terminal,
　the first value, when the predetermined coverage improvement process is not necessary for the M2M terminal, is assigned to the first parameter in the M2M terminal,
　the second value, the predetermined coverage improvement process when it is necessary for the M2M terminal, is assigned to the first parameter in the M2M terminal,
method.
[Requested item 43]
　A Machine-to-machine (M2M) non-transitory computer readable medium storing a program for causing the method to the computer about the M2M terminal that performs communication,
　the method comprising use for cell reselection or handover It comprises receiving the first and second values to be substituted into the first of the parameters from the base station,
　the first value, when the predetermined coverage improvement process is not necessary for the M2M terminal the M2M is assigned to the first parameter in the terminal,
　the second value, when the predetermined coverage improvement process is necessary for the M2M terminal, the first parameter in the M2M terminal being assigned,
non-transitory computer readable media.
[Requested item 44]
　The non-transitory computer readable medium storing a program for causing a process for the base station that communicates with Machine-to-machine (M2M) device to a computer,
　the method for cell reselection or handover provided to notify the first and second value assigned to the first parameter used by the M2M terminal to the M2M terminal,
　the first value is a predetermined coverage improvement process of the M2M terminal when not required for, is assigned to the first parameter in the M2M terminal,
　the second value, when the predetermined coverage improvement process is necessary for the M2M terminal in the M2M terminal It said first parameter is assigned to,
non-transitory computer readable media.
[Requested item 45]
　A wireless communication means for communicating with Machine-to-machine (M2M) device,
　a predetermined coverage improvement process is the cell reselection parameters, or the handover parameters are adjusted according to whether it is necessary for the M2M terminal and control means for notifying the M2M terminal
base station apparatus equipped with.
[Requested item 46]
　Wherein the predetermined coverage improvement process includes a process performed by a wireless terminal supporting Enhanced Coverage Mode (ECM), the base station apparatus according to claim 45.
[Requested item 47]
　Wherein the predetermined coverage improvement process, (a) Physical Broadcast Channel (PBCH) by repeating extra than normal transmission of broadcast information, (b) Physical Random Access Channel (PRACH) repeating the transmission of the preamble by a predetermined number of times , that, and (d) that repeatedly transmits the Physical Downlink Shared Channel (PDSCH) over a plurality of sub-frames, at least one of which repeatedly transmits (c) Physical Uplink Shared Channel over multiple sub-frames (PUSCH) including, a base station apparatus according to claim 45 or 46.
[Requested item 48]
　Wherein when the predetermined coverage improvement process is necessary for the M2M terminal, the cell re so that the predetermined cell or base station to support coverage improvement process is more likely to be selected by the M2M terminal adjusting the selected parameter or the handover parameters, the base station apparatus according to any one of claims 45-47.
[Requested item 49]
　The cell reselection parameters, or the handover parameters, the cell offset parameters acting on individual quality, an offset parameter that acts on the quality of the serving cell, the offset parameter acting on the adjacent cell individual quality, and cell reselection criteria or at least one of hysteresis parameters for the handover criterion easy or difficult satisfied satisfied including, a base station apparatus according to any one of claims 45-48.
[Requested item 50]
　A Machine-to-machine (M2M) method performed by a base station that communicates with the terminals and
　the predetermined coverage improvement process is the cell reselection parameter adjusted depending on whether it is necessary for the M2M terminal or a handover parameter comprises notifying the M2M terminal method.
[Requested item 51]
　The non-transitory computer readable medium storing a program for causing a process for Machine-to-machine (M2M) base station that communicates with the terminals to the computer,
　the method comprising the predetermined coverage improvement process is the M2M comprises the cell reselection parameters or handover parameters are adjusted according to whether it is necessary for the terminal to notify the M2M terminal,
non-transitory computer readable media.