JP5039840B2 - Mobile communication method, mobile station and radio base station - Google Patents

Description

  The present invention relates to a mobile communication method, a mobile station, and a radio, in which a mobile station transmits uplink data to a radio base station using an uplink radio resource that is fixedly assigned with a predetermined period starting from an allocation start time. Regarding the base station.

  The W-CDMA (Wideband-Division Multiple Access) method and the HSDPA (High Speed Downlink Packet Access) successor communication method, that is, the LTE (Long Term Evolution) method is a standardized W-CDMA group based on W-CDMA. The specifications are being developed.

  In the LTE scheme, it is considered that OFDMA is used for the downlink and SC-FDMA (Single-Carrier Frequency Multiple Access) is used for the uplink as a radio access scheme.

  OFDMA is a system in which a frequency band is divided into a plurality of narrow frequency bands (subcarriers) and data is transmitted on each frequency band, and the subcarriers interfere with each other even though they partially overlap on the frequency. By arranging them closely, it is possible to achieve high-speed transmission and increase frequency utilization efficiency.

  SC-FDMA is a transmission method that can reduce interference between terminals by dividing a frequency band and performing transmission using different frequency bands among a plurality of terminals. Since SC-FDMA has a feature that variation in transmission power becomes small, it is possible to realize low power consumption and wide coverage of a terminal.

  The LTE system is a system in which one or two or more physical channels are shared by a plurality of mobile stations for both uplink and downlink.

  A channel shared by a plurality of mobile stations is generally referred to as a shared channel. In the LTE scheme, in the uplink, it is a “Physical Uplink Shared Channel (PUSCH)”, and in the downlink, “ Physical downlink shared channel (PDSCH) ".

  In addition, the shared channel is a “uplink shared channel (UL-SCH)” in the uplink as a transport channel, and a “downlink shared channel (DL-SCH: Downlink) in the downlink. Shared Channel) ”.

  In the communication system using the shared channel as described above, the mobile station UE to which the shared channel is allocated is selected and selected for each subframe (sub-frame) (1 ms in the LTE scheme). It is necessary to signal the allocated mobile station UE to allocate a shared channel.

  The control channel used for this signaling is “physical downlink control channel (PDCCH)” or “downlink L1 / L2 control channel (DL L1 / L2 Control Channel: Downlink L1 //) in the LTE scheme. L2 Control Channel) ".

  Note that the above-described process of selecting which mobile station UE is assigned a shared channel for each subframe is generally called “scheduling”.

  In this case, since the mobile station UE to which a shared channel is dynamically allocated is selected for each subframe, this processing may be referred to as “Dynamic scheduling”.

  Further, the expression “allocating a shared channel” described above may be expressed as “allocating a radio resource for the shared channel”.

  The physical downlink control channel information includes, for example, “downlink scheduling information”, “uplink scheduling grant”, and the like.

  In “Downlink Scheduling Information”, for example, downlink resource block (Resource Block) allocation information, UE-ID, number of streams, information on precoding vector (Precoding Vector), data size, regarding downlink shared channel , Information on modulation scheme, HARQ (hybrid automatic repeat request), and the like.

  In addition, “Uplink Scheduling Grant” includes, for example, uplink resource block (Resource Block) allocation information, UE-ID, data size, modulation scheme, uplink transmission power information, Uplink regarding the uplink shared channel. Information on a demodulation reference signal (demodulation reference signal) in MIMO is included.

  Note that the above-described “Downlink Scheduling Information” and “Uplink Scheduling Grant” may be collectively referred to as “Downlink Control Information (DCI)”.

  The mobile station uses the “UE-ID (RNTI)” in the uplink scheduling grant or downlink scheduling to identify whether the uplink scheduling grant or downlink scheduling is transmitted to the mobile station. Do.

  More specifically, CRC bits included in the uplink scheduling grant and downlink scheduling are masked by the RNTI of the transmission destination mobile station.

  The mobile station performs a CRC check using the CRC bit. When the CRC check result is OK, the mobile station determines that an uplink scheduling grant or downlink scheduling is transmitted to the mobile station, and the CRC check result. Is NG, it is determined that no uplink scheduling grant or downlink scheduling is transmitted to the own station.

  The CRC bit is a bit for determining whether the transmitted signal is decoded erroneously or correctly.

  Therefore, when a certain mobile station receives a signal whose CRC bit is masked by the RNTI of another mobile station, the result of the CRC check is NG even if the signal can actually be received without error.

  The number of bits of the CRC bit and RNTI is, for example, 16 bits.

  In general, the mobile station attempts to decode, for example, 40 uplink scheduling grants and downlink scheduling in one subframe.

  In this case, for example, in about 40 uplink scheduling grants or downlink scheduling, signals actually transmitted to the own station, signals transmitted to other mobile stations, and any signals are included. This includes signals that are not transmitted and contain only noise.

  On the other hand, in “Persistent scheduling” being studied to realize VoIP and the like, the radio base station eNB starts from a subframe (assignment start time) specified by PDCCH (uplink scheduling grant or downlink scheduling information). As described above, uplink or downlink radio resources (PUSCH or PDSCH) are configured to be fixedly assigned to the mobile station at a predetermined period. Note that “Persistent scheduling” may also be referred to as “Semi-Persistent scheduling”.

  The allocation start time is a subframe in which downlink scheduling information is transmitted in the case of downlink, and is an uplink transmission subframe specified by an uplink scheduling grant in the case of uplink. is there. The predetermined period is 20 ms, for example.

  In “Persistent scheduling”, uplink scheduling grant or downlink scheduling information is transmitted via PDCCH only for initial transmission, and uplink scheduling grant or downlink scheduling information is transmitted via PDCCH in subsequent transmissions. Therefore, it is possible to reduce radio resources (overhead) necessary for transmitting the uplink scheduling grant or the downlink scheduling information, and as a result, efficient communication is possible.

  As described above, there are two types of uplink scheduling grant or downlink scheduling information: a case of notifying resource allocation by Dynamic scheduling and a case of notifying resource allocation by Persistent scheduling.

  In this case, the assignment between the dynamic scheduling and the persistent scheduling is identified based on, for example, the uplink scheduling grant or the RNTI set in the downlink scheduling information.

  More specifically, an RNTI for dynamic scheduling and an RNTI for persistent scheduling are defined, and based on the CRC check result, it is identified whether the allocation is based on the dynamic scheduling or the persistent scheduling.

3GPP TS 36.211 (V8.1.0), "Physical Channel and Modulation", November 2007 3GPP TS36.300 (V8.3.0), "E-UTRA and E-UTRAN Overall description", November 2007

  As described above, whether the uplink scheduling grant or the downlink scheduling information reports the allocation by the dynamic scheduling or the allocation by the persistent scheduling is identified by the uplink scheduling grant or the downlink scheduling information. This is performed based on RNTI or the like in the link scheduling information.

  Also, the mobile station attempts to decode about 40 uplink scheduling grants or downlink scheduling information within one subframe (within 1 ms).

  Here, since the CRC bits and the RNTI are 16 bits, False Alarm is generated with a probability of 1/216.

  Therefore, when 40 uplink scheduling grants or downlink scheduling information is decoded, the probability of generating a false alarm is 1/216 × 40.

  Here, False Alarm means that, although the radio base station has not transmitted an uplink scheduling grant or downlink scheduling information to the mobile station, the mobile station transmits an uplink to itself. An event that determines that a scheduling grant or downlink scheduling information has been transmitted.

  For example, in the case of resource allocation by dynamic scheduling, resource allocation by the uplink scheduling grant and downlink scheduling information is basically limited to the subframe, and thus the influence of the false alarm is small.

  However, in the case of resource allocation by persistent scheduling, an allocation start point is specified by the uplink scheduling grant and downlink scheduling information, and periodically and fixedly starting from the allocation start point. Since radio resources are allocated, the impact of False Alarm is enormous.

  In particular, in the case of the uplink, since the mobile station performs uplink transmission even though the radio base station has not assigned radio resources, the uplink transmission signal causes interference with other mobile stations. It becomes a signal and the characteristics of the system deteriorate significantly.

  Note that the above False Alarm is not an RNTI but a PDCCH that instructs a fixed allocation of PDSCH (downlink radio resource) for “Persistent scheduling” based on a specific 1 bit in the PDCCH, or This is also a problem that can occur in the same way even when it is configured to determine whether the PDCCH is a dynamically assigned PDSCH (downlink radio resource) for normal downlink scheduling.

  Therefore, the present invention has been made in view of the above-described problems, and a stable and efficient mobile communication method is achieved by reducing the probability of False Alarm of an uplink scheduling grant in “Persistent scheduling”. An object of the present invention is to provide a mobile station and a radio base station.

  A first feature of the present invention is a mobile communication method in which a mobile station transmits uplink data to a radio base station using an uplink radio resource that is fixedly allocated at a predetermined period starting from an allocation start time. The wireless base station notifying the mobile station of the predetermined period and information on the uplink radio resource, and the mobile station transmits a fixed assignment signal from the wireless base station. A step B1 of determining the allocation start time and transmitting the uplink data via the uplink radio resource starting from the allocation start time. In the step B, the mobile station The gist is to discard the fixed allocation signal when the information on the uplink radio resource and the information notified by the fixed allocation signal are inconsistent.

  That is, a first feature of the present invention is a mobile communication method in which a mobile station transmits uplink data to a radio base station using uplink radio resources allocated by predetermined scheduling information at a predetermined period. Based on the received predetermined scheduling information, step A2 for notifying the mobile station of information regarding the predetermined period and the uplink radio resource, step B2 for notifying the mobile station of predetermined scheduling information, and Starting from the time determined in step C2 and transmitting uplink data using the uplink radio resource allocated by the predetermined scheduling information in the predetermined cycle. In step C2, the uplink radio resource If there is a discrepancy between the information related to the information notified by the predetermined scheduling information In, and be required to discard the predetermined scheduling information.

  In the first aspect of the present invention, the information on the predetermined period and the uplink radio resource may be notified by an RRC message, and the fixed allocation signal may be notified by downlink control information.

  That is, in the first feature of the present invention, in step A2, information on the predetermined period and the uplink radio resource is notified by an RRC message, and in step B2, a downlink control channel is transmitted to the mobile station. The predetermined scheduling information may be transmitted via

  In the first aspect of the present invention, the information on the uplink radio resource limits a range of information specified by the fixed assignment signal, and the mobile station notifies the fixed assignment signal in the step B1. And the information related to the uplink radio resource and the information notified by the fixed allocation signal are inconsistent when the limited information is not included in the range of information specified by the limited fixed allocation signal You may judge.

  That is, in the first feature of the present invention, in step A2, the range of information that can be specified by the predetermined scheduling information is limited by information on the uplink radio resource, and is included in the predetermined scheduling information in step C2. If the information to be transmitted is not included in the range limited by the information about the uplink radio resource, it may be determined that the information about the uplink radio resource and the information notified by the predetermined scheduling information are inconsistent. .

  Also, in the first feature of the present invention, the fixed allocation signal, that is, the predetermined scheduling information includes resource block allocation information, modulation scheme, data size, MCS information, transmission format information, transmission power control information, Demodulation. Information regarding the cyclic shift of the RS may be included, and at least one of CQI requests may be included.

  A second feature of the present invention is a mobile communication method in which a mobile station transmits uplink data to a radio base station using uplink radio resources allocated by predetermined scheduling information at a predetermined cycle, Step A for notifying the mobile station of information on the predetermined period and the uplink radio resource, Step B for notifying the mobile station of predetermined scheduling information, and determination based on the received predetermined scheduling information And starting with the uplink radio resources allocated by the predetermined scheduling information at the predetermined period, and transmitting the uplink data, the information included in the predetermined scheduling information The process C may be executed when it matches the specified content.

  In the second aspect of the present invention, the predetermined scheduling information includes resource block allocation information, modulation scheme, data size, MCS information, transmission format information, transmission power control information, information regarding cyclic shift of Demodulation RS, CQI request At least one may be included.

  A third feature of the present invention is that the mobile station is configured to transmit uplink data to a radio base station using an uplink radio resource that is fixedly assigned at a predetermined period starting from an allocation start time. A fixed communication information receiving unit configured to receive the predetermined period and information on the uplink radio resource from the radio base station, and a fixed allocation signal from the radio base station A communication unit configured to determine the allocation start time when receiving, and to transmit the uplink data via the uplink radio resource starting from the allocation start time, the communication unit Is required to discard the fixed assignment signal when the information on the uplink radio resource and the information notified by the fixed assignment signal are inconsistent. To.

  That is, a third feature of the present invention is a mobile station configured to transmit uplink data to a radio base station using uplink radio resources allocated by predetermined scheduling information at a predetermined period. A receiving unit configured to receive information on the predetermined period and the uplink radio resource from the radio base station, and a time point determined based on the predetermined scheduling information received from the radio base station. And a communication unit configured to transmit uplink data using the uplink radio resource allocated by the predetermined scheduling information at the predetermined period, and the communication unit includes the uplink radio resource And the information notified by the predetermined scheduling information are inconsistent. It may be configured to discard the scheduling information.

  In the third aspect of the present invention, the information on the predetermined period and the uplink radio resource may be notified by an RRC message, and the fixed allocation signal may be notified by downlink control information.

  That is, in the third aspect of the present invention, the receiving unit is configured to receive information on the predetermined period and the uplink radio resource via an RRC message, and the communication unit performs downlink control. The predetermined scheduling information may be received via a channel.

  In the third aspect of the present invention, the communication unit includes information included in the predetermined scheduling information within a range of information that can be specified by the predetermined scheduling information limited by information related to the uplink radio resource. If not, the information on the uplink radio resource may be determined to be inconsistent with the information notified by the predetermined scheduling information.

  Further, in the third feature of the present invention, the fixed allocation signal, that is, the predetermined scheduling information includes resource block allocation information, modulation scheme, data size, MCS information, transmission format information, transmission power control information, Demodulation. Information regarding the cyclic shift of the RS may be included, and at least one of CQI requests may be included.

  A fourth feature of the present invention is a mobile station configured to transmit uplink data to a radio base station using uplink radio resources allocated by predetermined scheduling information at a predetermined cycle, Starting from a reception unit configured to receive information on the predetermined period and the uplink radio resource from the radio base station, and a time point determined based on the predetermined scheduling information received from the radio base station A communication unit configured to transmit uplink data using an uplink radio resource allocated by the predetermined scheduling information at the predetermined period, and the communication unit is notified by the predetermined scheduling information If the received information matches the content specified in advance, the uplink data is transmitted. It may be.

  In the fourth aspect of the present invention, the fixed allocation signal, that is, the predetermined scheduling information includes resource block allocation information, modulation scheme, data size, MCS information, transmission format information, transmission power control information, and Demodulation RS. It may include at least one of information related to cyclic shift and CQI request.

  A fifth feature of the present invention is a mobile communication system in which a mobile station transmits uplink data to a radio base station using an uplink radio resource that is fixedly assigned at a predetermined period starting from an allocation start time. A fixed communication information transmission unit configured to notify the mobile station of the predetermined period and information on the uplink radio resource, and to the mobile station On the other hand, a fixed allocation signal transmitting unit configured to transmit a fixed allocation signal, and the uplink via the uplink radio resource starting from the allocation start time determined by the fixed allocation signal A communication unit configured to receive data, wherein the fixed allocation transmission unit is designated by the fixed allocation signal as information on the uplink radio resource. It may be configured to notify the information to limit the scope of the information.

  That is, the fifth feature of the present invention is used in a mobile communication system in which a mobile station transmits uplink data to a radio base station using uplink radio resources allocated by predetermined scheduling information at a predetermined period. A first transmission unit configured to notify the mobile station of information related to the predetermined period and the uplink radio resource; and predetermined scheduling information to the mobile station. A second transmission unit configured to transmit, and a communication unit configured to receive uplink data transmitted at the predetermined period using the uplink radio resource allocated by the predetermined scheduling information; The second transmission unit is designated by the predetermined scheduling information as information on the uplink radio resource. And gist that it is configured to notify the information to limit the scope of the ability information.

  In the fifth aspect of the present invention, the information on the predetermined period and the uplink radio resource may be notified by an RRC message, and the fixed allocation signal may be notified by downlink control information.

  That is, in the fifth aspect of the present invention, the first transmission unit is configured to notify information related to the predetermined period and the uplink radio resource by an RRC message, and the first transmission unit The predetermined scheduling information may be notified via a link control channel.

  Further, in the fifth aspect of the present invention, the fixed allocation signal, that is, the predetermined scheduling information includes resource block allocation information, modulation scheme, data size, MCS information, transmission format information, transmission power control information, Demodulation. Information regarding the cyclic shift of the RS may be included, and at least one of CQI requests may be included.

  Furthermore, in the fifth aspect of the present invention, the first transmission unit may be configured to determine the range based on a data type.

  As described above, according to the present invention, it is possible to reduce the probability of false alarm of the uplink scheduling grant in “Persistent scheduling”, and as a result, a stable and efficient mobile communication method. A mobile station and a radio base station can be provided.

FIG. 3 is a functional block diagram of a mobile station according to the first embodiment of the present invention. It is a figure for demonstrating the uplink scheduling grant in the mobile communication system which concerns on the 1st Embodiment of this invention. It is a figure for demonstrating the scheduling performed in the mobile communication system which concerns on the 1st Embodiment of this invention. FIG. 3 is a functional block diagram of a radio base station according to the first embodiment of the present invention. 3 is a flowchart showing an operation of the mobile station according to the first embodiment of the present invention.

(Configuration of mobile communication system according to the first embodiment of the present invention)
With reference to FIG. 1, the structure of the mobile communication system which concerns on the 1st Embodiment of this invention is demonstrated. In the present embodiment, an LTE mobile communication system is described as an example, but the present invention is also applicable to other mobile communication systems.

  Further, in the mobile communication system according to the present embodiment, the mobile station UE uses the PUSCH (uplink radio resource) that is fixedly allocated at a predetermined period from the allocation start time to the radio base station eNB. It is configured to transmit uplink data.

  That is, the mobile communication system according to the present embodiment is configured such that the mobile station UE transmits uplink data to the radio base station using the uplink radio resource allocated by the predetermined scheduling information at a predetermined period. ing.

  As illustrated in FIG. 1, the mobile station UE includes a Persistent information receiving unit 11, a Persistent assignment signal receiving unit 12, and an uplink data transmitting unit 13.

  The Persistent information receiving unit 11 is configured to receive Persistent information including the above-described predetermined period and information on uplink radio resources from the radio base station eNB.

  Further, the Persistent information receiving unit 11 is configured to notify the Persistent assignment signal receiving unit 12 of information related to the uplink radio resource.

  Specifically, the Persistent information receiving unit 11 is configured to acquire the Persistent information described above based on the RRC message transmitted by the radio base station eNB.

  Here, the information on the uplink radio resource is, for example, a fixed allocation signal (that is, predetermined scheduling information) to be described later, that is, a PDCCH that instructs fixed allocation of PUSCH (uplink radio resource) for “Persistent scheduling”. This is information for limiting the range of information notified by (uplink scheduling grant).

  This will be described in more detail below.

  The information element of PDCCH (uplink scheduling grant) instructing the fixed allocation is, for example, information as shown in FIG.

  “Format indicator” is information indicating whether the PDCCH is information for uplink or information for downlink. The information for the downlink is also referred to as simple downlink control information.

  “Hopping flag” is information indicating whether or not hopping is applied to an uplink signal instructed to be transmitted by the PDCCH.

  “RB assignment information” is information indicating resource block allocation information related to an uplink signal instructed to be transmitted by the PDCCH.

  “MCS information” is information indicating information related to MCS related to an uplink signal instructed to be transmitted by the PDCCH. Here, the information on the MCS is information such as a data size, a modulation scheme, and a redundancy version parameter in HARQ, for example.

  “New Data Indicator” is information indicating whether an uplink signal instructed to be transmitted by the PDCCH is new transmission or retransmission.

  “TPC” is information for uplink transmission power control of an uplink signal specified by the PDCCH.

  “Cyclic shift for DMRS” is information related to “Cyclic shift” of “Demodulation Reference signal” which is an uplink signal specified by the PDCCH.

  “CQI request” is information instructing to transmit CQI in the uplink.

  “RNTI / CRC” is a CRC bit masked by “UE-ID (RNTI)”.

  In addition, the information element of PDCCH (uplink scheduling grant) mentioned above is an example, Information elements other than the above may be included, or even if a part of said information element is not included Good.

  And the information regarding the said uplink radio | wireless resource may be the information for restrict | limiting the range of the information notified by PDCCH (uplink scheduling grant) mentioned above so that it may demonstrate below.

  For example, the information on the uplink radio resource may be information for limiting a range of information notified by the “RB assignment information”.

  More specifically, the information on the uplink radio resource may be information for limiting the number of resource blocks notified by the “RB assignment information”.

  The information on the uplink radio resource may be information that limits the number of resource blocks notified by the “RB assignment information” to “2” or “3”.

  In this case, when the number of resource blocks notified by the PDCCH (uplink scheduling grant) is neither “2” nor “3”, the information on the uplink radio resource and the PDCCH (uplink scheduling grant) are notified. Information (RB assignment information) is inconsistent.

  The information on the uplink radio resource may be information that limits the number of resource blocks notified by the “RB assignment information” to “3” or less.

  That is, the information on the uplink radio resource may be information for notifying a maximum value of the number of resource blocks to be notified by the “RB assignment information”.

  In this case, when the number of resource blocks notified by the PDCCH (uplink scheduling grant) is not “3” or less, information on the uplink radio resource and information notified by the PDCCH (uplink scheduling grant) (RB assignment information) contradicts.

  In the above-described example, the information regarding the uplink radio resource is notified of the maximum value of the number of resource blocks notified by the “RB assignment information”, but may be notified of the minimum value instead.

  Alternatively, the information on the uplink radio resource may be notified of both the maximum value and the minimum value of the number of resource blocks notified by the “RB assignment information”.

  For example, for the information on the uplink radio resource, “10” may be notified as the maximum value of the number of resource blocks notified by the “RB assignment information” and “5” may be notified as the minimum value.

  In this case, when the number of resource blocks notified by the PDCCH (uplink scheduling grant) is larger than “10” or when the number of the resource blocks is smaller than “5”, the uplink radio resource And the information (RB assignment information) notified by the PDCCH (uplink scheduling grant) are inconsistent.

  Further, the information on the uplink radio resource is not limited to the above-described limiting method such as “limit the number of resource blocks” as long as the range of information notified by the “RB assignment information” is limited. The range of information notified by the “RB assignment information” may be limited by the limiting method.

  For example, the information on the uplink radio resource may be information for limiting the position in the frequency direction of the resource block notified by the “RB assignment information”.

  Alternatively, for example, the information on the uplink radio resource may be information notified by the “MCS information”, for example, information for limiting a range such as a modulation scheme or a data size.

  More specifically, the information on the uplink radio resource may be information for limiting a modulation scheme notified by the “MCS information”.

  For example, the information on the uplink radio resource may be information for limiting the modulation scheme notified by the “MCS information” to “QPSK”.

  In this case, when the modulation scheme notified by the PDCCH (uplink scheduling grant) is other than “QPSK”, for example, when the modulation scheme is “16QAM”, the information on the uplink radio resource and the PDCCH Information (MCS information) notified by (uplink scheduling grant) is inconsistent.

  In the above-described example, the information on the uplink radio resource is an example in which the modulation scheme notified by the MCS information is limited to “QPSK”, but is notified by the “MCS information” instead. The modulation method may be limited to “16QAM”, may be limited to “64QAM”, or may be limited to two types of “QPSK” and “16QAM”.

  More specifically, the information on the uplink radio resource may be notified of whether or not it is applied for each of the modulation schemes notified by the “MCS information”, “QPSK”, “16QAM”, and “64QAM”.

  Alternatively, for example, the information on the uplink radio resource may be information for limiting the data size notified by the “MCS information”.

  For example, the information on the uplink radio resource may be information that limits the data size notified by the “MCS information” to “320 bits”.

  In this case, when the data size notified by the PDCCH (uplink scheduling grant) is other than “320 bits”, for example, when the data size is “512 bits”, information on the uplink radio resource and Information (MCS information) notified by the PDCCH (uplink scheduling grant) is inconsistent.

  The value “320 bits” described above is an example, and a bit number other than “320 bits” may be designated.

  In the above example, one type of data size is specified, but two or more types of data size may be specified.

  That is, for example, the information on the uplink radio resource may be information that limits the data size notified by the “MCS information” to “320 bits” and “640 bits”.

  Alternatively, for example, the information on the uplink radio resource may be information that limits the data size notified by the “MCS information” to “320 bits” or less.

  In this case, when the data size notified by the PDCCH (uplink scheduling grant) is larger than “320 bits”, for example, when the data size is “512 bits”, the information about the uplink radio resource and Information (MCS information) notified by the PDCCH (uplink scheduling grant) is inconsistent.

  The value “320 bits” described above is an example, and a bit number other than “320 bits” may be designated. In the example described above, the maximum value of the data size is specified, but instead, the minimum value of the data size may be specified.

  Alternatively, both the maximum value and the minimum value of the data size may be specified. For example, “640 bits” may be specified as the maximum value of the data size, and “320 bits” may be specified as the minimum value.

  In this case, when the data size notified by the PDCCH (uplink scheduling grant) is larger than “640 bits”, or when the data size is smaller than “320 bits”, the information on the uplink radio resource And information (MCS information) notified by the PDCCH (uplink scheduling grant) are inconsistent.

  In the above-described example, the information related to the uplink radio resource is limited to the information notified by “RB assignment information” or the information notified by “MCS information”. The information elements other than the above may be restricted in the same manner by the information on the uplink radio resource.

  Further, the above-described “RB assignment information” and “MCS information” are information regarding resource blocks, modulation schemes, and data sizes, and may be referred to as “information regarding transmission formats”.

  The Persistent assignment signal receiving unit 12 is configured to receive a fixed assignment signal from the radio base station eNB.

  Specifically, the persistent assignment signal receiving unit 12 assigns a fixed allocation of PUSCH (uplink radio resource) for “persistent scheduling” transmitted from the radio base station eNB to the own station as a fixed assignment signal. Is configured to receive a PDCCH (uplink scheduling grant).

  For example, the Persistent allocation signal receiving unit 12 instructs a fixed allocation of PUSCH (uplink radio resource) for “Persistent scheduling” to the own station based on the RNTI or the like set in the PDCCH. It may be configured to determine whether or not a (link scheduling grant) has been transmitted.

  In addition, the persistent assignment signal receiving unit 12 determines whether the PDCCH that dynamically allocates PUSCH (uplink radio resource) based on the RNTI set in the PDCCH, that is, whether it is an uplink scheduling ground for dynamic scheduling. It may be configured to determine.

  In addition, as a method of LTE-based persistent scheduling, a PDCCH (uplink scheduling grant) for instructing fixed allocation of PUSCH (uplink radio resource) for “persistent scheduling” based on a specific bit in the PDCCH. If it is defined to determine whether there is a PDCCH that dynamically allocates PUSCH (uplink radio resource), that is, an uplink scheduling ground for dynamic scheduling, a persistent allocation signal receiving unit 12 is a PDCCH (uplink) instructing fixed allocation of PUSCH (uplink radio resource) for “Persistent scheduling” based on the 1 bit. Scheduling grant) is that of either, or, PDCCH allocating PUSCH (the uplink radio resource) dynamically, i.e., Dynamic may be configured to determine whether an uplink scheduling ground for scheduling.

  Alternatively, as a method of LTE-based persistent scheduling, a part of information elements in the PDCCH is a PDCCH (uplink scheduling grant) instructing fixed allocation of PUSCH (uplink radio resource) for “persistent scheduling”. Or the PDCCH that dynamically allocates PUSCH (uplink radio resource), that is, the uplink allocation grant for dynamic scheduling, the persistent allocation signal receiving unit 12 Based on a part of information elements in the PDCCH, a PDCCH (uplink link) instructing fixed allocation of PUSCH (uplink radio resource) for “Persistent scheduling” Scheduling grant) is that of either, or, PUSCH (uplink radio resource) PDCCH dynamically assigning a, that may be configured to determine whether an uplink scheduling grant for Dynamic scheduling.

  Further, the Persistent allocation signal receiving unit 12 is configured to receive information on the uplink radio resource from the Persistent information receiving unit 11.

  Here, the information on the uplink radio resource is, as described above, the PDCCH (uplink scheduling) that instructs the fixed allocation of the fixed allocation signal, that is, PUSCH (uplink radio resource) for “Persistent scheduling”. This is information for limiting the range of information notified by grant.

  The persistent allocation signal receiving unit 12 then transmits information on the uplink radio resource and a PDCCH (uplink) instructing fixed allocation of the fixed allocation signal, that is, PUSCH (uplink radio resource) for “persistent scheduling”. It is determined whether or not the information notified by the scheduling grant is inconsistent.

  The Persistent allocation signal receiving unit 12 includes information on the uplink radio resource and the fixed allocation signal, that is, a PDCCH (uplink scheduling grant) for instructing fixed allocation of PUSCH (uplink radio resource) for “Persistent scheduling”. ) Is determined to be inconsistent with the information notified, the fixed allocation signal that is determined to have been transmitted to the own station, that is, the PUSCH (uplink radio resource) for “Persistent scheduling” is fixed. PDCCH (uplink scheduling grant) instructing allocation is discarded.

  In other words, in such a case, the persistent allocation signal receiving unit 12 is notified by the PDCCH (uplink scheduling grant) instructing the fixed allocation of the persistent allocation signal, that is, PUSCH (uplink radio resource) for “Persistent scheduling”. This information is considered to have not been sent to the local station.

  The persistent assignment signal receiving unit 12 is a PDCCH (uplink) that instructs fixed assignment of the fixed assignment signal, that is, PUSCH (uplink radio resource) for “Persistent scheduling”, that has not been discarded in the above-described processing. Scheduling grant) is given to the uplink data transmission unit 13.

  An example of the above-described processing for discarding the fixed allocation signal, that is, the PDCCH (uplink scheduling grant) instructing the fixed allocation of the PUSCH (uplink radio resource) for “Persistent scheduling” is shown below. .

  For example, when the information on the uplink radio resource is information that limits the number of resource blocks notified by the “RB assignment information” to “2” or “3”, the PDCCH (uplink scheduling grant) When the number of resource blocks notified by the above is neither “2” nor “3”, the information on the uplink radio resource and the information notified by the PDCCH (uplink scheduling grant) (RB assignment information) are inconsistent. Then, the PDCCH (uplink scheduling grant) is discarded.

  Alternatively, for example, when the information on the uplink radio resource is information that limits the number of resource blocks notified by the “RB assignment information” to “3” or less, the PDCCH (uplink scheduling grant) When the number of notified resource blocks is not “3” or less, for example, when the number of such resource blocks is “5”, the information about the uplink radio resource and the PDCCH (uplink scheduling grant) are used for notification. The received information (RB assignment information) is inconsistent, and the PDCCH (uplink scheduling grant) is discarded.

  Alternatively, for example, when the information on the uplink radio resource is information that restricts the number of resource blocks notified by the “RB assignment information” to “10” or less and “5” or more, the PDCCH When the number of resource blocks notified by (uplink scheduling grant) is larger than “10” or smaller than “5”, for example, when the number of such resource blocks is “12”, It is determined that the information on the uplink radio resource and the information (RB assignment information) notified by the PDCCH (uplink scheduling grant) are inconsistent, and the PDCCH (uplink scheduling grant) is discarded.

  Alternatively, for example, when the information on the uplink radio resource is information for limiting the modulation scheme notified by the “MCS information” to “QPSK”, the modulation notified by the PDCCH (uplink scheduling grant) When the scheme is not “QPSK”, for example, when the modulation scheme is “16QAM”, information on the uplink radio resource and information (MCS information) notified by the PDCCH (uplink scheduling grant) Are determined to be inconsistent, and the PDCCH (uplink scheduling grant) is discarded.

  Alternatively, for example, when the information on the uplink radio resource is information for limiting the data size notified by the “MCS information” to “320 bits”, the information is notified by the PDCCH (uplink scheduling grant). When the data size is not “320 bits”, for example, when the data size is “1024 bits”, information on the uplink radio resource and information (MCS information) notified by the PDCCH (uplink scheduling grant). ) And the PDCCH (uplink scheduling grant) is discarded.

  Alternatively, for example, when the information on the uplink radio resource is information that limits the data size notified by the “MCS information” to “320 bits” or less, the information is notified by the PDCCH (uplink scheduling grant). When the data size is not “320 bits” or less, for example, when the data size is “512 bits”, information on the uplink radio resource and information notified by the PDCCH (uplink scheduling grant) ( It is determined that there is a contradiction with MCS information), and the PDCCH (uplink scheduling grant) is discarded.

  Alternatively, for example, when the information on the uplink radio resource is information that restricts the data size notified by the “MCS information” to “640 bits” or less and “320 bits” or more, the PDCCH ( When the data size notified by (uplink scheduling grant) is larger than “640 bits”, or when the data size is smaller than “320 bits”, for example, when the data size is “1024 bits” Determines that the information on the uplink radio resource and the information (MCS information) notified by the PDCCH (uplink scheduling grant) are inconsistent, and discards the PDCCH (uplink scheduling grant).

  In the above-described example, the persistent assignment signal receiving unit 12 instructs the fixed assignment of the information related to the uplink radio resource and the fixed assignment signal, that is, PUSCH (uplink radio resource) for “persistent scheduling”. When it is determined whether or not there is a contradiction with information notified by PDCCH (uplink scheduling grant) to be performed, but instead, it is determined whether or not there is a contradiction other than the above, and it is determined that such a contradiction exists Alternatively, the fixed allocation signal, that is, a PDCCH (uplink scheduling grant) instructing a fixed allocation of PUSCH (uplink radio resource) for “Persistent scheduling” may be discarded.

  For example, when the persistent allocation signal receiving unit 12 does not support uplink “64QAM” transmission as the capability (capability) of the mobile station, the persistent allocation signal, ie, “persistent scheduling” When transmission of “64QAM” is instructed by PDCCH (uplink scheduling grant) instructing fixed allocation of PUSCH (uplink radio resource), the fixed allocation signal, that is, PUSCH for “Persistent scheduling” PDCCH (uplink scheduling grant) instructing fixed allocation of (uplink radio resources) may be discarded.

  Alternatively, the Persistent assignment signal receiving unit 12 uses the fixed assignment signal, that is, “Persistent scheduling” when the maximum transmittable data size is “10000 bits” as the capability (Capability) of the mobile station. If a PDCCH (uplink scheduling grant) that instructs fixed allocation of PUSCH (uplink radio resources) of the UE is instructed to transmit an uplink signal with a data size of “20000 bits”, the fixed An allocation signal, that is, a PDCCH (uplink scheduling grant) instructing a fixed allocation of PUSCH (uplink radio resource) for “Persistent scheduling” may be discarded.

  Alternatively, in general, the fixed allocation signal, that is, a PDCCH (uplink scheduling grant) for instructing fixed allocation of PUSCH (uplink radio resource) for “Persistent scheduling” has no meaningful bit pattern as information. Exists.

  Therefore, the persistent allocation signal receiving unit 12 is a part of bits of the fixed allocation signal, that is, a PDCCH (uplink scheduling grant) that instructs fixed allocation of PUSCH (uplink radio resource) for “persistent scheduling”. When the pattern has no meaning as information, the fixed allocation signal, that is, PDCCH (uplink scheduling grant) instructing fixed allocation of PUSCH (uplink radio resource) for “Persistent scheduling” is discarded. May be.

  Note that the expression “a bit pattern has no meaning as information” may be expressed in other words as a bit pattern that should not be notified.

  In this case, the persistent assignment signal receiving unit 12 performs the fixed assignment of the fixed assignment signal, that is, the PUSCH (uplink radio resource) for “Persistent scheduling”, regardless of the information on the uplink radio resource. It may be determined whether a part of the bit pattern of the indicated PDCCH (uplink scheduling grant) has meaning as information.

  Alternatively, the persistent allocation signal receiving unit 12 performs fixed allocation of the above-described fixed allocation signal, that is, PUSCH (uplink radio resource) for “Persistent scheduling”, when there is no information regarding the uplink radio resource. It may be determined whether a part of the bit pattern of PDCCH (uplink scheduling grant) instructing is meaningful as information.

  Here, an example of the above-described “bit pattern that should not be notified” will be described.

  For example, in the fixed assignment signal, when it is defined that the value of the RB number indicated by “RB assignment information” in FIG. 2 is always “10” or less, the number of RBs indicated by the “RB assignment information”. The bit pattern indicating a value larger than “10” is a bit pattern that should not be notified.

  That is, when the value of the number of RBs indicated by “RB assignment information” in the fixed allocation signal is larger than “10”, the mobile station UE discards the fixed allocation signal.

  Alternatively, for example, in the fixed allocation signal, when the data size value indicated by “MCS information” in FIG. 2 is always defined to be “1000” or less, the data size indicated by the “MCS information” As a bit pattern indicating a value larger than “1000”, the bit pattern should not be notified.

  That is, the mobile station UE discards the fixed assignment signal when the value of the data size indicated by “MCS information” in the fixed assignment signal is larger than “1000”.

  Note that “when the value of the data size indicated by“ MCS information ”is larger than“ 1000 ”” means, for example, that some bits of the “MCS information” are not a predetermined value. Good. For example, when the data size is defined by a 4-digit binary number (hereinafter referred to as “abcd”; the first “a” is “Most Significant bit”), the data size is expressed in decimal. Then:

(Decimal number data size) = 23 × a + 22 × b + 21 × c + 20 × d
Here, when “a” that is “Most Significant bit” is not “0”, that is, when it is “1”, the data size is “8” or more.

  That is, the mobile station UE may discard the fixed assignment signal when some of the bits of “MCS information” in the fixed assignment signal are not a predetermined value.

  Furthermore, the mobile station UE determines that the “Most significant bit” of the “MCS information” in the fixed assignment signal is not a predetermined value (for example, in the above example, the “Most significant bit” is not “0”). Or when the value of a predetermined number of bits consecutive from “Most significant bit” is not a predetermined value (for example, in the above example, “the value of two consecutive bits is not a predetermined value) Assuming that there is no “when”, the values of both “a” and “b” are not “0”), the fixed allocation signal may be discarded.

  The same processing may be applied when the “MCS information” notifies both of the data size and the modulation method.

  Alternatively, for example, in the case of the fixed allocation signal, when the modulation scheme indicated by “MCS information” in FIG. 2 is always defined as “QPSK”, the modulation scheme indicated by the “MCS information” is “ A bit pattern indicating “16QAM” or “64QAM” is a bit pattern that should not be notified.

  That is, when the modulation scheme indicated by “MCS information” in the fixed assignment signal is not “QPSK”, the mobile station UE discards the fixed assignment signal.

  Alternatively, for example, since the fixed assignment signal is basically a signal for instructing new transmission, a bit pattern that specifies a modulation method at the time of retransmission in the “MCS information” is a bit that should not be notified. It becomes a pattern.

  That is, the mobile station UE discards the fixed assignment signal when the “MCS information” in the fixed assignment signal is a bit pattern that specifies a modulation method at the time of retransmission.

  Alternatively, for example, in the fixed assignment signal, when it is defined that “1” is always set as the value of “TPC” in FIG. 2, “0” as the value of “TPC”. Is a bit pattern that should not be notified.

  That is, the mobile station UE discards the fixed allocation signal when the value of “TPC” in the fixed allocation signal is “0”.

  In the example described above, the number of bits of “TPC” is “1”, but may be a value other than “1”, for example, “2” or “3”. For example, in the case where the number of bits of “TPC” is “2” and it is defined that “11” is always set as the value of “TPC”, “10”, “01”, “00” is a bit pattern that should not be notified.

  Alternatively, for example, in the case of the fixed assignment signal, when it is defined that “1” is always set as the value of “Cyclic Shift for DMRS” in FIG. 2, the “Cyclic Shift for DMRS” “0” as a value is a bit pattern that should not be notified.

  That is, the mobile station UE discards the fixed assignment signal when the value of “Cyclic Shift for DMRS” in the fixed assignment signal is “0”.

  In the example described above, the number of bits of “Cyclic Shift for DMRS” is “1”, but may be a value other than “1”, for example, “2” or “3”.

  Or, for example, in the fixed assignment signal, when it is defined that “1” is always set as the value of “CQI request” in FIG. 2, “CQI request” as “CQI request” value “ “0” is a bit pattern that should not be notified.

  That is, the mobile station UE discards the fixed assignment signal when the value of “CQI request” in the fixed assignment signal is “0”.

  Alternatively, for example, in the fixed allocation signal, when it is defined that “1” is always set as the value of “New Data Indicator” in FIG. 2, the value of “New Data Indicator” is “0” is a bit pattern that should not be notified.

  That is, the mobile station UE discards the fixed assignment signal when the value of “New Data Indicator” in the fixed assignment signal is “0”.

  Alternatively, the mobile station UE may identify the above-described “bit pattern that should not be notified” based on information in the fixed assignment signal received in the past.

  For example, when the data size indicated by “MCS information” in the fixed allocation signal received in the past is always “320 bits”, the mobile station UE sets a bit pattern indicating a data size other than “320 bits”, It may be regarded as a bit pattern that should not be notified.

  In consideration of the occurrence of “False Alarm” in a state where a correct fixed allocation signal has never been received in the past, for example, the mobile station UE fixes the same data size at least “three times” in the past. When a general allocation signal is received, a bit pattern indicating a data size other than the data size may be regarded as a bit pattern that should not be notified.

  Alternatively, the mobile station UE should not be notified of a bit pattern indicating a data size other than the data size when receiving a fixed allocation signal having the same data size continuously “three times” or more in the past. It may be regarded as a bit pattern.

  In the example described above, the number “320 bits” and the number “three times” are merely examples, and values other than those described above may be used.

  A plurality of processes may be simultaneously applied to the process of discarding PDCCH (downlink scheduling) instructing fixed allocation of PUSCH (uplink radio resource) for “Persistent scheduling” described above.

  That is, a process of discarding a plurality of PDCCHs instructing the fixed assignment is performed, and when it is determined that the PDCCH is discarded in at least one process, a process of discarding the PDCCH is performed. May be.

  The uplink data transmission unit 13 is configured to transmit uplink data that is transmitted via a PUSCH (uplink radio resource) assigned by the PDCCH.

  Specifically, the uplink data transmission unit 13 receives a persistent allocation signal (fixed allocation signal) from the persistent allocation signal reception unit 12, that is, a PUSCH (uplink radio resource) for “Persistent scheduling”. When a PDCCH (uplink scheduling grant) instructing allocation is received, an uplink transmission subframe designated by the PDCCH is determined as the above “allocation start time”, and the “allocation start time” is set as a starting point. It is configured to transmit uplink data via a PUSCH (uplink radio resource) for “Persistent scheduling” fixedly at the “predetermined period” described above.

  In the example of FIG. 3, in the subframe # 3, the persistent allocation signal receiving unit 12 receives the above persistent allocation signal via the PDCCH, so the uplink data transmitting unit 13 transmits the uplink specified by the PDCCH. Uplink data is transmitted via a PUSCH (uplink radio resource) mapped to a resource block (a set of subcarriers) in subframe # 7.

  Further, the uplink data transmission unit 13 starts uplink from the subframe # 7 via the PUSCH (uplink radio resource) mapped to the resource block (set of subcarriers) specified by the PDCCH with a period of 20 ms. It is configured to send data.

  That is, the uplink data transmission unit 13 transmits the PUSCH (uplink radio resource) mapped to the resource block (set of subcarriers) specified by the PDCCH in subframes # 7, # 27, # 47,. Via the network, and is configured to transmit uplink data.

  On the other hand, the radio base station eNB according to the present invention is configured to notify the mobile station UE of information regarding the above-described predetermined period and uplink radio resource.

  Since the description regarding the information regarding the uplink radio resource is the same as the description in the mobile station UE, the description thereof is omitted.

  As illustrated in FIG. 4, the radio base station eNB includes a Persistent information transmission unit 21, a Persistent assignment signal transmission unit 22, and an uplink data reception unit 23.

  The Persistent information transmitting unit 21 is configured to transmit Persistent information (fixed communication information) including the above-described predetermined period and information on uplink radio resources to the mobile station UE.

  Specifically, the Persistent information transmission unit 21 is configured to notify the above-described Persistent information to the mobile station UE using an RRC message.

  Here, the information on the uplink radio resource is notified by, for example, a fixed allocation signal, that is, a PDCCH (uplink scheduling grant) that instructs fixed allocation of PUSCH (uplink radio resource) for “Persistent scheduling”. This is information for limiting the range of information to be stored.

  The description of the information related to the uplink radio resource is the same as the description in the mobile station UE, and will be omitted.

  Here, the Persistent information transmission unit 21 may set information on the uplink radio resource based on the data type.

  For example, when the data type is VoIP, the persistent information transmission unit 21 restricts the number of resource blocks notified of the information about the uplink radio resource by the “RB assignment information” to “3” or less. When the data type is streaming, the information about the uplink radio resource is set to information that restricts the number of resource blocks notified by the “RB assignment information” to “10” or less. May be.

  Alternatively, the persistent information transmission unit 21 sets the information on the uplink radio resource to information that restricts the modulation scheme notified by the “MCS information” to “QPSK” when the data type is VoIP. When the data type is streaming, the information on the uplink radio resource may be set to information that restricts the modulation scheme notified by the “MCS information” to “QPSK” or “16QAM”.

  Alternatively, when the data type is VoIP, the persistent information transmission unit 21 sets the information on the uplink radio resource to information that limits the data size notified by the “MCS information” to “320 bits”. When the data type is streaming, the information on the uplink radio resource may be set to information that restricts the data size notified by the “MCS information” to “640 bits”.

  That is, how the information notified by the fixed allocation signal, that is, PDCCH (uplink scheduling grant) instructing fixed allocation of PUSCH (uplink radio resource) for “Persistent scheduling” is limited. May be determined according to the data type of data to which resources are allocated by persistent scheduling.

  The “data type” described above may be rephrased as “service type”. That is, the “service type” indicates a type of service that transmits a packet, and may include, for example, a VoIP service, a voice service, a streaming service, an FTP (File Transfer Protocol) service, and the like.

  In the above-described example, the persistent information transmission unit 21 sets the information on the uplink radio resource based on the “data type”, but instead, “contract type”, “logical channel type”, “cell type”, Information on the uplink radio resource may be set based on the “priority type”.

  The “contract type” indicates the type of contract to which the user of the mobile station UE has subscribed, and includes, for example, a Low Class contract, a High Class contract, a fixed charge contract, a pay-per-use contract, and the like.

  The “cell type” is a cell operation mode, and can be indoor, outdoor, urban, or countryside.

  “Logical channel type” is a type of logical channel such as Dedicated Control Channel (DCCH) or Dedicated Traffic Channel (DTCH). A plurality of logical channels may be further defined in the DCCH and DTCH.

  Here, “Radio Bearer” means a bearer that transmits data, and is defined on a one-to-one basis with respect to a logical channel for transmission, and as a result, is almost synonymous with a logical channel.

  The “priority type” is a class for classifying priorities related to transmission of downlink and uplink data. For example, data of the first priority class is data of the second priority class. It is transmitted with priority over.

  The “priority type” is bundled with the Logical Channel and may be referred to as “Logical Channel Priority”. Alternatively, the “priority type” may be defined as “Priority Class”.

  The Persistent assignment signal transmission unit 22 is configured to transmit a fixed assignment signal to the mobile station UE.

  Specifically, the persistent allocation signal transmission unit 22 instructs the mobile station UE to perform fixed allocation of PUSCH (uplink radio resource) for “persistent scheduling” as a fixed allocation signal (uplink). Scheduling grant).

  In addition, as described above, the persistent assignment signal transmission unit 22 is defined as “1” is always set as the value of “TPC (see FIG. 2)” in the fixed assignment signal. Alternatively, “1” may always be set as the value of “TPC”.

  Alternatively, for example, as described above, the persistent assignment signal transmission unit 22 always sets “1” as the value of “Cyclic Shift for DMRS” (see FIG. 2) in the fixed assignment signal. When defined, “1” may always be set as the value of the “Cyclic Shift for DMRS”.

  Alternatively, for example, as described above, the persistent allocation signal transmission unit 22 is defined as “1” being always set as the value of “CQI request (see FIG. 2)” in the fixed allocation signal. In this case, “1” may always be set as the value of the “CQI request”.

  Alternatively, for example, as described above, the persistent assignment signal transmission unit 22 defines that “1” is always set as the value of “New Data Indicator (see FIG. 2)” in the fixed assignment signal. In such a case, “1” may always be set as the value of the “New Data Indicator”.

  The uplink data receiving unit 23 is configured to receive uplink data transmitted via a PUSCH (uplink radio resource) assigned by the PDCCH.

  Specifically, when the persistent assignment signal (fixed assignment signal) is transmitted by the persistent assignment signal transmission unit 22, the uplink data reception unit 23 transmits an uplink transmission subframe specified by the PDCCH. The above-mentioned “assignment start time” is determined, and reception of uplink data via the PUSCH (uplink radio resource) for “Persistent scheduling” is fixed at the above “predetermined period” from the “assignment start time”. Configured to do.

(Operation of the mobile communication system according to the first embodiment of the present invention)
With reference to FIG. 5, the operation of the mobile communication system according to the first embodiment of the present invention will be described.

  As shown in FIG. 5, in step S101, the mobile station UE receives Persistent information including the above-described predetermined period and information on uplink radio resources from the radio base station eNB by an RRC message or the like.

  The information on the uplink radio resource is notified by, for example, a fixed allocation signal, that is, a PDCCH (uplink scheduling grant) instructing fixed allocation of PUSCH (uplink radio resource) for “Persistent scheduling”. This is information for limiting the range of information.

  The description of the information related to the uplink radio resource is the same as the description in the mobile station UE, and will be omitted.

  In step S102, the mobile station UE receives the Persistent assignment signal (fixed assignment signal) transmitted via the PDCCH by the radio base station eNB.

  More specifically, the mobile station UE gives a PDCCH (uplink scheduling grant) instructing fixed allocation of PUSCH (uplink radio resource) for “Persistent scheduling” as a fixed allocation signal from the radio base station eNB. Receive.

  In step S103, the mobile station UE and the PDCCH (uplink scheduling) instructing fixed allocation of the information related to the uplink radio resource and the fixed allocation signal, that is, PUSCH (uplink radio resource) for “Persistent scheduling”. It is determined whether the information notified by the grant is inconsistent.

  Note that the details of the above-described determination as to whether or not there is a contradiction are the same as those described in the mobile station UE, and are therefore omitted.

  The mobile station UE is notified by the information on the uplink radio resource and the fixed allocation signal, that is, PDCCH (uplink scheduling grant) instructing the fixed allocation of PUSCH (uplink radio resource) for “Persistent scheduling”. When it is determined that there is a contradiction with the information to be performed (step S103: YES), the operation proceeds to step S104.

  In step S104, the mobile station UE discards the fixed allocation signal, that is, a PDCCH (uplink scheduling grant) instructing a fixed allocation of PUSCH (uplink radio resource) for “Persistent scheduling”.

  That is, the mobile station UE does not receive the information notified by the fixed allocation signal, that is, the PDCCH (uplink scheduling grant) instructing the fixed allocation of the PUSCH (uplink radio resource) for “Persistent scheduling”. It is considered that it was not sent to the station.

  In step S105, the mobile station UE uses the above-described persistent allocation signal (fixed allocation signal), that is, PDCCH (uplink scheduling grant) instructing fixed allocation of PUSCH (uplink radio resource) for “Persistent scheduling”. The designated uplink transmission subframe is determined as the above-mentioned allocation start time, and the uplink via the PUSCH (uplink radio resource) for “Persistent scheduling” is fixed at the above-mentioned predetermined period from the allocation start time Start sending data.

  That is, in such a case, the mobile station UE transmits uplink data via the PUSCH (uplink radio resource) for persistent scheduling until the PUSCH (uplink radio resource) for “Persistent scheduling” is released.

(Operations and effects of the mobile communication system according to the first embodiment of the present invention)
As described above, the probability of False Alarm for one PDCCH (uplink scheduling grant or downlink scheduling information) is 1/216.

  In general, since the mobile station UE tries to decode about 40 PDCCHs in one subframe, the total False Alarm probability is calculated as 40 × 1/216 = 0.0006.

  Here, the above-described False Alarm is an event in which the mobile station UE determines that the PDCCH is accidentally transmitted to the local station even though the PDCCH is not transmitted to the local station. It is highly possible that the information is random information.

  Therefore, as described above, when the mobile station UE has a limit on the range of information in the PDCCH and receives a PDCCH having information other than the above limit, by performing a process of discarding the PDCCH, The probability of the False Alarm can be greatly reduced.

  For example, it is assumed that the number of bits other than the CRC in the PDCCH is 24 bits, and the range of 12 bits is limited. In order to simplify the calculation, it is assumed that the 12-bit bit pattern is limited to one.

In this case, as described above, when the mobile station UE limits the range of information in the PDCCH, and receives a PDCCH having information other than the above-mentioned limit, the process of discarding the PDCCH causes the False The probability of Alarm is
40 × 1/216 × 212/224 = 1.5 × 10 −7
And is greatly reduced.

  That is, according to the mobile communication system according to the first embodiment of the present invention, it is possible to reduce the probability of PALCH (uplink scheduling grant False Alarm) notifying resource allocation for persistent scheduling. A stable and efficient mobile communication method, mobile station, and radio base station can be provided.

(Example of change)
The operations of the mobile station UE and the radio base station eNB described above may be implemented by hardware, may be implemented by a software module executed by a processor, or may be implemented by a combination of both. .

  The software module includes a RAM (Random Access Memory), a flash memory, a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electronically Erasable and Programmable ROM, a Hard Disk, a Registered ROM, a Hard Disk Alternatively, it may be provided in a storage medium of an arbitrary format such as a CD-ROM.

  Such a storage medium is connected to the processor so that the processor can read and write information from and to the storage medium. Further, such a storage medium may be integrated in the processor. Such a storage medium and processor may be provided in the ASIC. Such an ASIC may be provided in the mobile station UE or the radio base station eNB. Further, the storage medium and the processor may be provided as a discrete component in the mobile station UE or the radio base station eNB.

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

UE ... mobile station 11 ... persistent information receiver 12 ... persistent allocation signal receiver 13 ... uplink data transmitter eNB ... radio base station 21 ... persistent information transmitter 22 ... Persistent assignment signal transmission unit 23 ... uplink data reception unit

Claims (2)

A mobile communication method in which a mobile station transmits an uplink signal to a radio base station,
Step A for notifying the mobile station of an uplink scheduling grant as predetermined scheduling information;
The mobile station has a step B of transmitting an uplink signal based on the received uplink scheduling grant ,
In the mobile station, the mobile communication value of the information element of the uplink scheduling in Grant "Cyclic Shift for DMRS" is, if not match the fixed value defined in advance, and wherein the discarding the uplink scheduling grant Method. A mobile station configured to transmit an uplink signal to a radio base station,
Comprising a communication unit configured to transmit an uplink signal based on an uplink scheduling grant received as predetermined scheduling information from the radio base station,
The communication unit value of the information element of the uplink scheduling in Grant "Cyclic Shift for DMRS" is the case where not match the fixed value defined in advance, that is configured to discard the uplink scheduling grant A mobile station characterized by