Technical field
[0001]
　The present disclosure relates to a wireless communication system that performs communication control for coverage improvement.
Background technique
[0002]
　In 3rd Generation Partnership Project (3GPP), 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, are 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 Long Term Evolution (LTE) network or LTE-Advanced network is anticipated . 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 and LTE-Advanced, call 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 (eg, 1 single receive antenna only), high-order modulation (eg, 64 quadrature amplitude modulation (64QAM)) does not support, the available radio bandwidth narrowband (eg, 1.4 MHz) is, and the like are considered, thereby the maximum transmission rate of the MTC UE is reduced.
[0004]
　Therefore, In 3GPP, communication characteristics of the MTC UE that are normally expected to be inferior to that of the UE (i.e., coverage) improve (Improve) or enhance (* Enhance) standardization of technology for has been performed (Non-patent Document 1). Hereinafter, an example of a technology for improving the coverage of the MTC UE being considered in 3GPP. Note that coverage enhancement techniques (coverage enhancement) 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. The UE to apply these special coverage enhancement techniques state, coverage improvement mode (Coverage Enhancement (CE) Mode), coverage expansion mode (Coverage Extension (CE) Mode), enhanced coverage mode (Enhanced Coverage Mode ( ECM)), or it is called the extended coverage mode (extended coverage mode (ECM)).
[0005]
　Characteristics are improved by the coverage improvement technique (detection characteristics in other words the wireless base station (evolved NodeB (eNB))) the reception characteristics, Physical Random Access Channel (PRACH) transmission characteristics of the preamble of Physical Broadcast Channel (PBCH), Physical Downlink reception characteristics Control Channel (PDCCH), transmission characteristics of the reception characteristic of the Physical Downlink Shared Channel (PDSCH), transmission characteristics of the Physical Uplink Control Channel (PUCCH), Physical Uplink 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 eNB by UE (ie, random access). The PDCCH, for example, the scheduling information of the downlink data by the eNB (DL assignment), and a downlink physical channel used for transmitting the radio resource allocation information of uplink data (UL grant). PDSCH is a downlink physical channel used for system information and data received by the UE. PUSCH is a physical uplink channel used for data transmission by UE.
[0006]
　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 (see Non-Patent Document 2). 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 (see Non-Patent Document 3). The reception characteristics of the PDSCH, and one of the processing that has been studied to improve the transmission characteristics of the PUCCH and PUSCH is to PDSCH over a plurality subframes repeated PUCCH, and a PUSCH transmission (non-patent see reference 4). Furthermore, one of the processing that has been studied to improve the reception characteristics of the M-PDCCH is a PDCCH that transmits the L1 / L2 control information for MTC UE repeatedly transmits the M-PDCCH over a plurality subframes it is. By these processes, it is expected that normally be degraded from UE to improve the communication characteristics of the MTC UE expected. In the case where downlink data are scheduled by the repeated transmission of the M-PDCCH, the data is considered to be transmitted in sub-frame after the sub-frame is the last repeat transmission of M-PDCCH is performed . Further, the downlink control information contained in the M-PDCCH (DL Control Information), has also been considered to include the number of repetitions of the M-PDCCH (number of repetitions that will be actually performed).
[0007]
　Transmitting the repeat count and the reception number of iterations required to improve the communication characteristics, depending on where the MTC UE is installed, it depends on the propagation loss between each MTC UE and eNB (pathloss). Therefore, coverage improved technique provides a plurality of coverage improved level (coverage enhancement (CE) levels). Coverage improved level (coverage enhancement (CE) levels) is, enhanced coverage levels, coverage extension levels, there extended coverage levels, or repetition levels (eg, PRACH repetition levels) sometimes called. Further, between the CE level and Repetition level sometimes one-to-one relationship or a predetermined relative relationship, it is set in advance.
[0008]
　For example, coverage improvement techniques typically coverage (normal coverage, zero coverage extension) was added to provide three CE levels. A plurality of CE levels are associated with different transmission repetition frequency and receiving number of repetitions each other. Transmitting the repeat count and the received number of iterations used in high CE level is larger than those used in low CE level. Each MTC UE is larger propagation loss between the MTC UE and eNB is assigned to a high CE level. In some implementations, MTC UE measures the estimated propagation loss between the received power (Reference Signal Received Power (RSRP)) or MTC UE and eNB of the reference signal from the eNB, the measured RSRP or propagation determine the CE level required based on the loss (estimated), and transmits a random access preamble (RACH) preamble according to the maximum transmission number of iterations associated with the determined CE level (see Patent Document 1) .
CITATION
Patent Literature
[0009]
Patent Document 1: International Publication No. WO 2015/021315
Non-Patent Document
[0010]
非特許文献1 : 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2 : 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3 : 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4 : 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
[0011]
　eNB needs to inform the radio resource configuration of the plurality of CE levels for MTC UE to support coverage enhancement techniques. For example, eNB is initial access (ie, random access) by MTC UE idle radio resource configuration about the system information for the MTC UE (ie, System Information Block x-bis (SIB x-bis)), for example, SIB 1-bis or SIB 2-bis, transmitted in the cell, including the. If if it is necessary system information explicitly includes a plurality of radio resource configuration for multiple CE level, the data size of the system information is increased.
[0012]
　One objective to be achieved is the embodiment disclosed herein, the data size necessary to inform a plurality of radio resource configuration from the base station to the wireless terminal for a plurality of coverage improved level (ie, contributes apparatus to reduce the signaling overhead) is to provide 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
[0013]
　In a first aspect, the base station includes a memory, and at least one processor coupled to said memory. Wherein the at least one processor is configured to transmit a first value associated with the normal coverage or first coverage improvement level for the first radio resource configuration information element and the information about the conversion factor, the wireless terminal It is. The value of the conversion factor obtained from the information on the conversion factor, to derive a second value associated with a second coverage improvement level for the first radio resource configuration information element from said first value used by the wireless terminal.
[0014]
　In a second aspect, a method in a base station, a first value associated with the normal coverage or first coverage improvement level for the first radio resource configuration information element and the information about the conversion factor, the wireless terminal It includes transmitting to. The value of the conversion factor obtained from the information on the conversion factor, to derive a second value associated with a second coverage improvement level for the first radio resource configuration information element from said first value used by the wireless terminal.
[0015]
　In a third aspect, the radio terminal includes a memory, and at least one processor coupled to said memory. Wherein the at least one processor is configured to perform at least one module. Wherein the at least one module includes a receiving module and a calculation module. The receiving module, a normal first value associated with a coverage or first coverage improvement level for the first radio resource configuration information element, and is configured to receive from the base station. Said computing module, by converting the first value using the value of the conversion factor, deriving a second value associated with a second coverage improvement level for the first radio resource configuration information element It is configured to.
[0016]
　In a fourth aspect, a method in a wireless terminal, (a) to the normal first value associated with a coverage or first coverage improvement level for the first radio resource configuration information element is received from the base station , and (b) by converting the first value using the value of the conversion factor, deriving a second value associated with a second coverage improvement level for the first radio resource configuration information element to it, including the.
[0017]
　In a fifth aspect, the program includes the when loaded into a computer, instructions for performing the method according to the second or fourth aspects described above to a computer (software code).
Effect of the invention
[0018]
　According to the embodiments described above, it contributes to reducing multiple data size required multiple radio resource configuration from the base station to inform the wireless terminal for coverage improvement level (ie, signaling overhead) the device, method, and it is possible to provide a program.
BRIEF DESCRIPTION OF THE DRAWINGS
[0019]
It is a diagram illustrating a configuration example of a wireless communication network according to FIG. 1 with some embodiments.
[2] is a sequence diagram showing an example of a transmission operation of system information according to the first embodiment.
3 is a diagram showing an example of a repeated transmission of the RACH preamble.
Is a diagram illustrating an example of FIG. 4 the value of the radio resource configuration information element for multiple CE levels.
5 is a flowchart illustrating an exemplary operation of the wireless terminal according to the first embodiment.
6 is a diagram showing a first example of a calculation for deriving the radio resource configuration information element by the radio terminal according to the first embodiment.
7 is a diagram showing a second example of calculation for deriving the radio resource configuration information element by the radio terminal according to the first embodiment.
8 is a diagram showing a third example of calculation for deriving the radio resource configuration information element by the radio terminal according to the first embodiment.
9 is a diagram showing a fourth example of calculation for deriving the radio resource configuration information element by the radio terminal according to the first embodiment.
10 is a diagram showing an example of a random access procedure according to the first embodiment.
11 is a block diagram showing a configuration example of a radio terminal according to some embodiments.
Is a block diagram showing an exemplary configuration of a base station according to FIG. 12 with some embodiments.
DESCRIPTION OF THE INVENTION
[0020]
　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.
[0021]
　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.
[0022]
　The following several embodiments shown in will be described an Evolved Packet System (EPS) that houses the LTE and SAE (System Architecture Evolution) as a main target. However, these embodiments are not intended to be limited to EPS, other mobile communication networks or systems, for example 3GPP UMTS, 3GPP2 CDMA2000 systems (1xRTT, HRPD (High Rate Packet Data)), global system for mobile communications ( GSM (TM)) / General packet radio service (GPRS) system, and may be applied to WiMAX systems.
[0023]

　FIG 1 shows a configuration example of a wireless communication network according to some embodiments including the present embodiment. In the example of FIG. 1, a wireless communications network includes one or more wireless terminals (ie, MTC UE) 1 and a base station (eNB) 2. Each MTC UE1 has at least one radio transceiver, and is configured to perform cellular communications with the eNB2. eNB2 manages cell 21, and is configured to perform each of the cellular communication for multiple MTC UE1 using cellular communication techniques (eg, Evolved Universal Terrestrial Radio Access (E-UTRA) technology).
[0024]
　eNB2 shown in FIG. 1 may be a Centralized Radio Access Network (C-RAN) Baseband Unit used in the architecture (BBU). In other words, eNB2 shown in FIG. 1 may be a RAN node connected to one or more Remote Radio Head (RRH). In some implementations, eNB2 as BBU is responsible for digital baseband signal processing control plane processing and user plane. Meanwhile, RRH is responsible for analog Radio Frequency (RF) signal processing (eg, frequency conversion and signal amplification). Incidentally, C-RAN may also be referred to as the Cloud RAN. Further, BBU may also be referred to as a Radio Equipment Controller (REC) or Data Unit (DU). The RRH, Radio Equipment (RE), Radio Unit (RU), or sometimes referred to as Remote Radio Unit (RRU).
[0025]
　In the example of FIG. 1, MTC UE Ia, in order to away the distance from eNB2 compared to MTC UE1B, larger radio quality propagation loss is to degrade envisioned. MTC UE1C is installed in a building (e.g. building), it is assumed that the radio quality is deteriorated as compared with the case of being installed outdoors. Further, if each MTC UE1, voice and UEs performing human type communication web browsing, etc., for example, when having only smartphones and tablet computers, capacity or function limited compared to, more pronounced deterioration in radio quality of It is expected to be. Thus, MTC UE1 according to the present embodiment supports the coverage improvement techniques described above.
[0026]
　As already explained, in order to improve cell coverage on the downlink (DL), the repetition of DL transmission, for example, may be system information, repeatedly sending the M-PDCCH, and PDSCH used. In order to improve the cell coverage of the uplink (UL), the repetition of UL transmission can RACH preamble, PUCCH, and the repeated transmission of the PUSCH is used.
[0027]
　MTC UE1 may support multiple CE modes (or ECMs). In some implementations, MTC UE1 may support different CE modes (or ECMs) for CE modes (or ECMs) and RRC_CONNECTED state for the RRC_IDLE state. Additionally or alternatively, MTC UE1 may be support multiple CE modes (or ECMs) for RRC_IDLE state, even support multiple CE modes (or ECMs) for RRC_CONNECTED state good. In some implementations, a plurality of Coverage improved levels are defined for each CE mode (or each ECM). Additionally or alternatively, in some implementations, the plurality of CE modes provide different coverage improved levels each other.
[0028]
　Figure 2 is an example of a transmission operation of the system information according to the present embodiment (the processing 200) shown. In step 201, eNB2 transmits the system information (eg, SIB1-bis, SIB2-bis) in the cell 21. eNB2 according coverage improvement set for the DL of the cell 21, system information (SIB1bis, SIB2-bis) may be repeatedly transmitted a.
[0029]
　The system information transmitted in step 201, explicitly or implicitly indicate information that coverage improvement technology (Coverage enhancement solution) is supported by the cell, and control information necessary for coverage improvement technology (Coverage enhancement configuration ) encompasses. In particular, the system information is associated with a normal coverage (normal coverage, zero coverage extension), or first increase coverage (CE) level (eg, CE level 1) for the first radio resource configuration information element (IE) value (hereinafter referred to as the "base value (base value)") encompasses. The first radio resource configuration IE is a necessary IE to be set to a different value for each CE level. For example, the first radio resource configuration IE is, UL message is repeatedly transmitted in a random access procedure, UL physical channels, DL message, and may relate to at least one of the DL physical channel.
[0030]
　In some implementations, the first radio resource configuration IE may include at least one of a plurality of IEs relating listed RACH set below:
· NumberOfRA-preambles;
· MaxNumPreambleAttemptCE;
· EnuyuemuaruipietitionPerPreambleAttempt;
· ra- ResponseWindowSize;
· mac-ContentionResolutionTimer;
· MaxHARQ-Msg3Tx; and
· numRepetitionPerRA-Response.
[0031]
　"NumberOfRA-Preambles" IE indicates the total number of random access preamble (RACH preamble) that can be used for contention based random access. "MaxNumPreambleAttemptCE" IE indicates the maximum number of attempts of PRACH attempt (CE level each). "NumRepetitionPerPreambleAttempt" IE indicates the number of repetitions of the preamble transmission per PRACH attempt (CE per level). "Ra-ResponseWindowSize" IE shows a random access (RA) · response window duration (duration). "Mac-ContentionResolutionTimer" IE, the third message of the random access procedure (Msg3), i.e. the reception of Medium Access Control (MAC) Contention Resolution message for RA Contention Resolution from eNB2 after sending the RRC Connection Request message to the eNB2 the timer value of the MAC contention resolution timer for waiting for the show. "MaxHARQ-Msg3Tx" IE, the third message of the random access procedure (Msg3), i.e. indicating the maximum number of RRC Connection Request message, the Hybrid Automatic Repeat Request (HARQ) retransmissions (retransmissions). "NumRepetitionPerRA-Response" IE, a second message of the random access procedure (Msg2), i.e. the number of repetitions of M-PDCCH transmission to be used for transmission of a random access response (RAR) message (CE level per), or RAR It indicates the number of times of repetition of message transmission. Note that these IE names are exemplary and other names may be used for these IE.
[0032]
　Figure 3 shows an example of a repeated transmission of the RACH preamble to be performed by the MTC UE1 supporting coverage enhancement techniques. In the example of FIG. 3, MTC UE1 is once repeated preamble transmission of 4 times per PRACH attempt on, executes 20PRACH attempt at maximum. MTC UE1 is to increase the transmission power of the RACH preamble to initiate the next attempt in accordance with one of the failure of the attempt and power ramping scheme.
[0033]
　Figure 4 shows an example of values ​​of radio resource configuration information element for multiple CE levels. In the example of FIG. 4, the value of "maxNumPreambleAttemptCE" IE associated with the least CE level (ie, CE level 1) is 20, the value of "numRepetitionPerPreambleAttempt" IE is 4. This corresponds to the example shown in FIG. On the other hand, the higher the CE level, number of repetitions of the preamble transmission maximum number of attempts and PRACH attempt per PRACH attempt to both increase. That is, the value of "maxNumPreambleAttemptCE" IE associated with CE level 2 is 60, the value of "numRepetitionPerPreambleAttempt" IE is 10. Furthermore, the value of "maxNumPreambleAttemptCE" IE associated with CE level 3 is 120, the value of "numRepetitionPerPreambleAttempt" IE is 20.
[0034]
　In some implementations, the first radio resource configuration IE may include at least one of a plurality of IEs relating listed PRACH configuration below:
· prach-ConfigIndex; and
· prach-FreqOffset.
[0035]
　"Prach-ConfigIndex" IE indicates the value for MTC UE1 to define should when transmitting a random access preamble within a frequency / time grids (ie, R_Slot). "Prach-FreqOffset" IE indicates the frequency offset value for identifying the RACH access available physical resource blocks (Physical Resource Block (PRB)).
[0036]
　3GPP specification defines a set or one-dimensional array of values ​​of a predetermined number that can be set in each radio resource configuration IE (eg, 8 pieces). These values ​​are arranged, for example, ascending or descending order, each value associated with the index value of the order of ascending or descending order. Therefore, the radio resource configuration IE indicates the index value representing one of the values ​​contained in these sets or one-dimensional array. For example, in the 3GPP Release 12, RA response window size is in units of subframes can be set to a value of eight of 2,3,4,5,6,7,8, and 10 sub-frames. Thus, "ra-ResponseWindowSize" IE has a 3 bit length, indicating the value of any of these eight index value of 3 bits.
[0037]
　MTC UE1, the first radio resource configuration IE normal coverage (zero coverage extension, CE level 0) for the or the first CE level (eg, CE level 1) the basal value associated with received from eNB2, the other CE level for the first radio resource configuration IE (second CE level (eg, CE level 2)) is derived from the basic value received value (second value) associated with the. Thus, MTC UE1 does not need to receive additional IE that indicates a second value associated with the second CE level for the first radio resources configuration IE explicitly from eNB2.
[0038]
　More specifically, MTC UE1 is converted factors to derive a second value associated with the basal values ​​received from eNB2 to the second CE level (eg, CE level 2) of the (conversion factor) use the value. Conversion factor may be simply expressed as factor. To support the derivation of the second value in the MTC UE1, in some implementations, eNB2 is in the system information transmitted in step 201 of FIG. 2, it may further include a value of the conversion factor. Alternatively, in some implementations, eNB2 is information for deriving the value of indirectly indicates information or conversion factor value of the conversion factor, in the system information transmitted in step 201 of FIG. 2 in addition it may be included in the. For example, information indicating the value of the conversion factor indirectly may be an index for designating any one of the values ​​from a set comprising a plurality of candidate values ​​determined in advance. For example, information for deriving the value of the conversion factor may comprise one or more parameters are substituted into equation predetermined conversion factor. That, eNB2 is information about the conversion factor (eg, the value of the conversion factor per se, information indicating the value of the conversion factor indirectly, information for deriving the value of the conversion factor) may be transmitted to the MTC UE1 to . Information about the conversion factor is used by the MTC UE1 to obtain the value of the conversion factor. In this case, the procedure derived (calculated) conversion factor and a second value for the use of this explicit a second value associated with the CE level for one or more wireless resources configuration IE from eNB2 to MTC UE1 is defined as data size of the information about the conversion factor is smaller than the data size necessary to transmit the.
[0039]
　Prior to step 201, eNB2 may calculate the value of the conversion factor that is sent to the MTC UE1. Specifically, eNB2 is 1 or more second CE level (eg, CE levels 1-3) and first determines the value of radio resource configuration IE, determined IE values ​​for each the basic value of the first radio resources configuration IE value of the conversion factor may be calculated for each second CE level using (eg, IE value for CE level 0).

　A base station,
　a memory and,
　at least one processor coupled to the memory,
provided with,
　at least one processor is usually coverage or first coverage improvement level for the first radio resource configuration information element a first value associated with, the information about the conversion factor, is configured to transmit to the radio terminal,
　the value of the conversion factor obtained from the information on the conversion factor, the first radio resource configuration information element the used by the wireless terminal a second value associated with a second coverage improved levels to derive from said first value for,
the base station.
[Claim 2]
　The first radio resource configuration information element includes two or more radio resource configuration information element,
　wherein the second value is associated with said second coverage improvement levels for the two or more radio resource configuration information element two include more values,
　the value of the conversion factor, the commonly said two or more values to derive from said first value being used by the wireless terminal,
a base station according to claim 1 .
[Claim 3]
　The value of the conversion factor, in addition to the second value, deriving a third value associated with a third coverage improvement level for the first radio resource configuration information element from said first value the are used by the wireless terminal to,
the base station according to claim 1.
[Claim 4]
　The value of the conversion factor, wherein the first radio resource configuration information element is also used as the value associated with the second coverage improvement levels for different second radio resource configuration information element,
according to claim 1 the base station according to any one of the three.
[Claim 5]
　Wherein the at least one processor, further wherein the value of the conversion factor to be transmitted to the radio terminal is calculated using the first value and the second value, the value of the computed transform factor wherein being configured to transmit to the radio terminal,
the base station according to any one of claims 1-4.
[Claim 6]
　A method in a base station,
　a first value associated with the normal coverage or first coverage improvement level for the first radio resource configuration information element and the information about the conversion factor, by sending to the wireless terminal the provided,
　the value of the conversion factor obtained from the information on the conversion factor, from the second of the second of said values first value associated with a coverage improvement level for the first radio resource configuration information element the used by the wireless terminal to derive,
methods.
[Claim 7]
　The method in the base station A non-transitory computer readable medium storing a program for causing a computer,
　the method comprising the normal coverage or first coverage improvement level for the first radio resource configuration information element a first value associated with the information about the conversion factor comprises transmitting to a wireless terminal,
　the value of the conversion factor obtained from the information on the conversion factor, for the first radio resource configuration information element the second of the second value associated with the coverage improved levels to derive from said first value being used by the wireless terminal, the
non-transitory computer readable media.
[8.]
　A wireless terminal,
　a memory,
　and at least one processor coupled to said memory,
comprising a
　at least one processor is configured to perform at least one module,
　said at least one module,
　the first Usually coverage or a first value associated with a first coverage improvement level, a receiving module configured to receive from a base station, for the radio resource configuration information element
　of the first using the value of the conversion factor by converting the values, a calculation module configured to derive a second value associated with a second coverage improvement level for the first radio resource configuration information element
comprises,
wireless terminal.
[Claim 9]
　The first radio resource configuration information element includes two or more radio resource configuration information element,
　wherein the second value is associated with said second coverage improvement levels for the two or more radio resource configuration information element and comprise more than one value,
　the calculation module, the two or more values for use in common the value of the conversion factor to derive from said first value,
the wireless terminal according to claim 8.
[Claim 10]
　Said computing module, in addition to the second value, a third value associated with a third coverage improvement level for the first radio resource configuration information element to derive from said first value used in common value of the conversion factor,
the wireless terminal according to claim 8.
[Claim 11]
　Wherein the at least one processor, information related to the conversion factor to obtain a value of the conversion factor is configured to receive from the base station,
the wireless terminal according to any one of claims 8-10.
[Claim 12]
　The value of the conversion factor is also used as the first value associated with the second coverage improvement levels for different second radio resource configuration information element from the radio resource configuration information element,
to claim 11 wireless terminal according.
[Claim 13]
　Wherein said at least one module, further
　wherein the estimation module configured to estimate the coverage improved level to the wireless terminal to follow,
　the estimated first associated coverage improvement level of the radio resource configuration information element a communication module for communicating with the base station in accordance with the value
provided with,
　the computing module, the second value as the value of the estimated coverage to the associated first improved level radio resource configuration information element calculations,
wireless terminal according to any one of claims 8-12.
[Claim 14]
　The first radio resource configuration information element comprises at least one parameter for random access procedure,
　wherein the at least one parameter
defining the available frequency and time resources for the transmission of (a) a random access preamble parameters, (b) a parameter indicating the total number of random access preamble, (c) a parameter indicating the maximum number of transmission attempts of a random access preamble (attempts), (d) random access per transmission attempt of the random access preamble - number of repetitions of the preamble transmission, (e) a parameter indicating a random access response window duration (duration), (f) contention resolution timer duration indicating the (duration) parameter, (g) said base Maximum number of iterations of the random access response transmitted by the station, and (h) a parameter indicating the maximum number of retransmissions of the third message in response to receiving the random access response includes at least one of,
the claims 8 to 13 wireless terminal according to any one.
[Claim 15]
　A method in a wireless terminal,
　to a normal first value associated with a coverage or first coverage improvement level for the first radio resource configuration information element is received from the base station, and
　the value of the conversion factor by converting the first value using, deriving a second value associated with a second coverage improvement level for the first radio resource configuration information element,
it comprises a method.
[Claim 16]
　The non-transitory computer readable medium storing a program for causing a method in a wireless terminal to a computer,
　the method comprising
　the normal coverage or first coverage improvement level for the first radio resource configuration information element a first value associated with, receiving from the base station, and
　by converting the first value using the value of the conversion factor, a second coverage for the first radio resource configuration information element deriving a second value associated with the increase level,
comprising a non-transitory computer readable media.