JP2011166650A - Base station device, mobile station device, communication system and communication method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a base station device capable of flexibly allocating continuously-arranged resources and discontinuously-arranged resources, a mobile station device, a communication system, and a communication method. <P>SOLUTION: The control information of a first format including scheduling information for designating uplink resources continuously arranged in a frequency direction is arranged in a resource in a first region in a physical downlink control channel, and the control information of a second format having the same number of bits as that of the first format and including scheduling information for designating one of the uplink resource arranged discontinuously and the uplink resource arranged continuously in the frequency direction is arranged in a resource in a second region in the physical downlink control channel. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a base station device, a mobile station device, a communication system, and a communication method.

  Evolution of cellular mobile communication radio access method and wireless network (hereinafter referred to as “Long Term Evolution (LTE) or“ Evolved Universal Terrestrial Radio Access (EUTRA) ”) and a wider frequency band. In addition, a radio access scheme and a radio network (hereinafter referred to as “Long Term Evolution-Advanced (LTE-A)” or “Advanced Evolved Universal Terrestrial Radio Access (A-EUTRA)” that realizes higher-speed data communication. Is the 3rd Generation Partnership Project (3rd Generation Partnership Pr ject; has been studied in 3GPP).

  In LTE, an Orthogonal Frequency Division Multiplexing (OFDM) system that is multicarrier transmission is used as a downlink (wireless communication from a base station apparatus to a mobile station apparatus). Further, as an uplink (wireless communication from the mobile station apparatus to the base station apparatus), a single carrier communication system of SC-FDMA (Single-Carrier Frequency-Division Multiple Access) system which is single carrier transmission is used.

  FIG. 14 illustrates a downlink radio frame configuration in LTE. In the downlink, a physical downlink control channel (Physical Downlink Control Channel; PDCCH), a physical downlink shared channel (Physical Downlink Shared Channel; PDSCH), and the like are allocated. The downlink radio frame is composed of a downlink resource block (RB) pair. This downlink RB pair is a unit such as downlink radio resource allocation, and is based on a predetermined frequency band (RB bandwidth) and time band (2 slots = 1 subframe). Become. One downlink RB pair is composed of two downlink RBs (RB bandwidth × slot) that are continuous in the time domain. One downlink RB is composed of 12 subcarriers in the frequency domain, and is composed of 7 OFDM symbols in the time domain. The physical downlink control channel is a physical channel through which downlink control information such as a mobile station identifier, downlink shared channel scheduling information, uplink shared channel scheduling information, modulation scheme, coding rate, and retransmission parameters is transmitted. .

  FIG. 15 illustrates an uplink radio frame configuration in LTE. In the uplink, a physical uplink shared channel (Physical Uplink Channel; PUSCH), a physical uplink control channel (Physical Uplink Control Channel; PUCCH), and the like are allocated. Further, an uplink pilot signal is assigned to a part of PUSCH or PUCCH. The uplink radio frame is composed of uplink RB pairs. This uplink RB pair is a unit for allocation of uplink radio resources and the like, and is based on a predetermined frequency band (RB bandwidth) and time band (2 slots = 1 subframe). Become. One uplink RB pair is composed of two uplink RBs (RB bandwidth × slot) that are continuous in the time domain. One uplink RB is composed of 12 subcarriers in the frequency domain, and is composed of 7 SC-FDMA symbols in the time domain.

  FIG. 16 is a schematic diagram of uplink radio communication in LTE. When the base station apparatus 1601 receives the uplink transmission signal 1603 from the mobile station apparatus 1602, scheduling information (RB assignment information, RB allocation) indicating which RB the mobile station apparatus 1602 transmits the uplink transmission signal 1603 to Information), and downlink control information (DCI) 1604 is notified to the mobile station apparatus 1602. In LTE, uplink scheduling information indicates RBs continuously arranged in the frequency direction, and each mobile station apparatus 1602 transmits an uplink transmission signal 1603 using RBs continuously arranged in the frequency direction.

  FIG. 17 illustrates an example of a configuration of a downlink control information format (DCI format: Downlink Control Information Format) in LTE. As described in Non-Patent Document 1, Format0 which is a downlink control information format including uplink related information such as uplink scheduling information and Format1A which is a downlink control information format including downlink related information are the same. It consists of the number of bits. When the sum of the number of bits of each bit field of Format 0 including uplink-related information is different from the sum of the number of bits of each bit field of Format 1A including downlink-related information, the downlink control information format has a large total number of bits. A bit indicating 0 is added to the downlink control information format having a small total number of bits so as to match the total number of bits (adding a bit indicating 0 is referred to as zero padding).

The first bit field of Format0 and Format1A is a flag (Flag format 0 / format 1A) for identifying Format 0 and Format 1A having the same total number of bits. The mobile station apparatus first checks a flag for identifying Format0 and Format1A, and recognizes the subsequent bit field configuration. Format 0 further includes bit fields such as a hopping flag and a resource block assignment. Format 0 Resource block assignment is a bit field indicating one or more RBs continuous in the frequency direction used for PUSCH transmission, and is the number of bits of ceil (log ₂ (N ^UL _RB (N ^UL _RB +1) / 2)) Consists of Here, ceil () represents a ceiling function, log ₂ () represents a logarithm with a base of 2, and N ^UL _RB represents the number of RBs included in the uplink system bandwidth.

FIG. 18 shows an example of an RB assigned to the mobile station apparatus when the hopping flag is OFF. The base station apparatus uses the ceil (log ₂ (N ^UL _RB (N ^UL _RB +1) / 2)) bit of the Resource block assignment field to determine the position of the RB having the lowest frequency among the RBs allocated to the mobile station apparatus. , And the number of RBs continuously allocated from the RB to the higher frequency. In each slot, RBs allocated to the mobile station apparatus are RBs continuously arranged in the frequency direction. When the hopping flag is OFF, RB allocations allocated in the frequency direction in two slots in the uplink subframe are common. Will be assigned.

FIG. 19 shows an example of an RB assigned to the mobile station apparatus when the hopping flag is ON. The base station apparatus uses the ceil (log ₂ (N ^UL _RB (N ^UL _RB +1) / 2)) bit of the Resource block assignment field to specify different allocations in the frequency direction in the two slots in the subframe. In each slot, RBs allocated to the mobile station apparatus are RBs continuously arranged in the frequency direction. In addition, when retransmitting the PUSCH with the hopping flag OFF in the physical HARQ indicator channel (PHICH), the PUSCH is retransmitted with the same RB as the initial transmission, and the PUSCH with the hopping flag ON is switched to the physical HARQ indicator channel ( In the case of retransmitting with the Physical HARQ Indicator Channel (PHICH), the PUSCH is retransmitted with an RB different from the initial transmission.

  The physical HARQ indicator channel is a downlink physical channel that indicates to the mobile station apparatus whether the data obtained by the base station apparatus decoding the signal included in the PUSCH is incorrect or not. If the hopping flag is ON, hopping may be performed only between subframes without hopping between slots.

“3GPP TS36.213 v8.6.0 (2009-03)”, March 17, 2009.

  However, in the conventional technique, only resources that are continuously arranged can be allocated, and there is a problem that frequency utilization efficiency is lowered.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a base station device, a mobile station device, a communication system, and a communication method capable of flexibly allocating continuously arranged resources and non-continuously arranged resources. It is to provide.

(1) The present invention has been made to solve the above-described problems, and a base station apparatus according to an aspect of the present invention has a first format for resources in a first region in a physical downlink control channel. Control information is arranged, and control information of a second format having the same number of bits as that of the first format is arranged in resources in a second region of the physical downlink control channel.

(2) A base station apparatus according to an aspect of the present invention is the above-described base station apparatus, wherein the control information in the first format specifies scheduling that specifies uplink resources arranged continuously in the frequency direction. And the control information in the second format includes scheduling information that specifies one of the uplink resources arranged continuously in the frequency direction and the uplink resource arranged not continuously. To do.

(3) Moreover, the base station apparatus according to an aspect of the present invention is the above base station apparatus, and the control information of the second format includes uplink resources in which the scheduling information is continuously arranged in the frequency direction. And non-continuous arrangement flag information indicating which of the uplink resources arranged without being consecutive is designated.

(4) A base station apparatus according to an aspect of the present invention is the base station apparatus described above, wherein the control information in the second format does not include predetermined information included in the control information in the first format. The discontinuous arrangement flag information is arranged at a position where the predetermined information is arranged in the first format.

(5) In addition, when the mobile station apparatus according to an aspect of the present invention decodes the received data of the resource in the first region in the physical downlink control channel, the decoded received data is used as control information in the first format. If the received data of the resource in the second region in the physical downlink control channel is decoded, the control information of the second format having the same number of bits as the first format of the decoded received data It is characterized by determining.

(6) Moreover, the mobile station apparatus by 1 aspect of this invention is said mobile station apparatus, Comprising: The allocation of the uplink resource continuously arrange | positioned in the frequency direction is acquired from the control information of the said 1st format. Then, the allocation of either one of the uplink resources arranged continuously in the frequency direction and the uplink resource arranged not continuously is obtained from the control information of the second format.

(7) In addition, the mobile station apparatus according to an aspect of the present invention is the mobile station apparatus described above, and the uplink resource in which the scheduling information is continuously arranged in the frequency direction from the control information of the second format. When the non-continuous allocation flag information indicating which of the uplink resources that are not consecutively allocated is specified and the non-continuous allocation flag information indicates the uplink resources continuously allocated, the second When the allocation of the uplink resource continuously arranged in the frequency direction is acquired from the control information of the format, and the non-continuous arrangement flag information indicates the uplink resource arranged without being continuous, the second format It is characterized in that allocation of uplink resources that are arranged not continuously in the frequency direction is acquired from the control information.

(8) A mobile station apparatus according to an aspect of the present invention is the mobile station apparatus described above, wherein the non-continuous arrangement flag information is extracted from the control information of the second format. The non-continuous arrangement flag information is extracted from the same position as the position where the predetermined information different from the non-continuous arrangement flag information is arranged.

(9) A communication system according to an aspect of the present invention is a communication system that performs communication between a base station apparatus and a mobile station apparatus, and the base station apparatus includes a first downlink in a physical downlink control channel. Control information of the first format is arranged in resources in the region, and control information of the second format having the same number of bits as the first format is allocated to resources in the second region in the physical downlink control channel. When the mobile station apparatus decodes the received data of the resource in the first area, the mobile station apparatus determines the decoded received data as the control information of the first format, When the received data of the resource is decoded, the control information of the second format is determined.

(10) A communication method according to an aspect of the present invention is a communication method in a base station apparatus that communicates with a mobile station apparatus, and includes a first format for resources in a first region in a physical downlink control channel. And the control information of the second format having the same number of bits as the first format is arranged in the resources in the second region of the physical downlink control channel.

(11) A communication method according to an aspect of the present invention is a communication method in a mobile station device that communicates with a base station device, and decodes received data of resources in a first region in a physical downlink control channel. In this case, when the decoded received data is determined to be control information of the first format and the received data of resources in the second region in the physical downlink control channel is decoded, the decoded received data is The control information of the second format having the same number of bits as the format of 1 is determined

  According to the present invention, continuously arranged resources and non-continuously arranged resources can be flexibly allocated.

It is the figure which showed the outline of the uplink radio communication which concerns on the 1st Embodiment of this invention. It is the figure which showed an example of the resource allocation which concerns on the same embodiment. It is the figure which showed an example of the control information format which concerns on the same embodiment. It is the figure which showed an example of the resource allocation of the discontinuous arrangement | positioning which concerns on the same embodiment. It is the figure which showed another example of the resource allocation of the discontinuous arrangement | positioning which concerns on the same embodiment. It is the figure which showed an example of the search area | region which concerns on the same embodiment. It is the figure which showed another example of the search area | region which concerns on the same embodiment. It is the figure which showed an example of the response | compatibility of the value of the bit of Hopping flag, and Non-contiguous flag, and the state which the value shows. It is the figure which showed the setting of the hopping and RB allocation with respect to the combination of the search area | region which concerns on the same embodiment, Hopping flag, and Non-continuous flag. It is the figure which showed an example of the control information format which concerns on the 2nd Embodiment of this invention. It is the figure which showed an example of the control information format which concerns on the 3rd Embodiment of this invention. It is the figure which showed an example of the block configuration of the base station apparatus which concerns on the 4th Embodiment of this invention. It is the figure which showed an example of the block configuration of the mobile station apparatus which concerns on the same embodiment. FIG. 2 is a diagram illustrating a downlink radio frame configuration. FIG. 2 is a diagram illustrating an uplink radio frame configuration. It is the figure which showed the outline of the uplink radio | wireless communication. It is the figure which showed an example of the structure of a downlink control information format. It is the figure which showed an example of RB allocated to a mobile station apparatus. It is the figure which showed an example of RB allocated to a mobile station apparatus.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic diagram of uplink wireless communication according to the present embodiment. A base station apparatus (eNodeB, eNB, downlink transmission apparatus, uplink reception apparatus, cell) 101 performs uplink transmission from a mobile station apparatus (UE: User Equipment, downlink reception apparatus, uplink transmission apparatus, terminal apparatus) 102. When the signal 104 is received, the mobile station apparatus 102 transmits downlink control information (Downlink Control Information; DCI) including uplink scheduling information indicating which RB the uplink transmission signal (SC-FDMA signal) 103 is to be transmitted. ) 106 is notified to the mobile station apparatus 102. The mobile station apparatus 102 is a mobile station apparatus that supports only continuous allocation of resource allocation in the physical uplink shared channel, or a mobile station apparatus in a mode in which only continuous allocation of resource allocation can be set. The downlink control information 106 notified from the base station apparatus 101 to 102 includes scheduling information indicating RBs continuously arranged in the frequency direction.

  On the other hand, the mobile station apparatus 103 is a mobile station apparatus that supports both continuous resource allocation and non-continuous resource allocation in the physical uplink shared channel, or is continuous resource allocation and non-continuous resource allocation. It is a mobile station apparatus in a mode in which both assignments can be set. When the base station apparatus 101 receives an uplink transmission signal (SC-FDMA signal or Clustered DFT (Discrete Fourier Transform) -precoded-OFDM signal) 105 from the mobile station apparatus 103, the mobile station apparatus 103 receives the uplink transmission signal 105. The mobile station apparatus 103 is notified of downlink control information 107 including uplink scheduling information indicating which RB is to be transmitted. At this time, the downlink control information 107 includes scheduling information indicating RBs arranged continuously in the frequency direction or RBs arranged discontinuously. Note that continuous resource allocation means that continuous RBs are allocated in the frequency direction, and non-continuous resource allocation means that non-continuous RBs are allocated in the frequency direction. Note that the resource allocation in the discontinuous arrangement includes a case where some resources are configured by RBs that are continuous in the frequency direction.

  FIG. 2 shows an example of resource allocation indicated by the scheduling information according to the present embodiment. This example is an example of non-continuous resource allocation. In resource allocation in a non-continuous arrangement, several RB chunks (clusters) are allocated in the frequency axis direction. FIG. 2 shows an example in which two clusters are allocated, and each cluster is composed of four or two consecutive RBs in the frequency direction. Here, although the number of clusters is two in non-continuous resource allocation, the number of clusters is not limited to this, and the number of clusters may be three or more.

  FIG. 3 shows an example of the downlink control information format (DCI Format) according to the present embodiment. Format0 (first format) and Format0A (second format) are downlink control information formats including uplink-related information such as uplink scheduling information, and are configured with the same number of bits. Also, Format0A has the same number of bits as Format1A including the downlink related information shown in FIG. The number of bits in each field other than the field padded with 0 is the same in Format0 and Format0A.

Format 0 is a downlink control information format including the downlink control information 106 in FIG. 1, and is used for resource allocation in a continuous arrangement. The top bit field of Format0 is a flag (Flag forformat0 / format1A) for identifying Format0 and Format1A. The mobile station apparatus first confirms this flag and knows the subsequent bit field configuration. The hopping flag is a field indicating whether or not to perform PUSCH transmission (hopping) using different RBs at different times. The Resource block assignment field is a bit field for designating the allocation (Type 0) of RBs in the consecutive arrangement as shown in FIG. 18 or FIG. 19, and ceil (log ₂ (N ^UL _RB (N ^UL _RB +1) / 2). )) Composed of bits.

Here, ceil () represents a ceiling function, log ₂ () represents a logarithm with a base of 2, and N ^UL _RB represents the number of RBs included in the uplink system bandwidth. When hopping is OFF (when the hopping flag indicates that hopping is not performed), using the ceil (log ₂ (N ^UL _RB (N ^UL _RB +1) / 2)) bit, as shown in FIG. In the continuously arranged RBs, the position of the RB having the lowest frequency among the assigned RBs and the number of consecutive RBs are designated to the mobile station apparatus 102. On the other hand, when hopping is ON (when the hopping flag indicates that hopping is not performed), the same ceil (log ₂ (N ^UL _RB (N ^UL _RB +1) / 2)) bit is used in FIG. As shown in the figure, the mobile station apparatus 102 is assigned with consecutively arranged RBs that differ in the frequency direction in two slots in the subframe.

  Format 0A is a downlink control information format including the downlink control information 107 in FIG. 1, and is used for both continuous resource allocation and non-continuous resource allocation. The top bit field of Format0A is a flag (Flag format 0A / format 1A) for identifying Format 0A and Format 1A. The mobile station apparatus first confirms this flag and knows the subsequent bit field configuration. The non-continuous allocation flag (Non-continuous flag) is a field indicating whether or not Format0A indicates resource allocation of non-continuous allocation. More specifically, the non-consecutive arrangement flag is a field indicating whether the Resource block assignment field indicates non-continuous arrangement resource allocation or continuous arrangement resource assignment.

The Resource block assignment field is a bit field for designating continuous allocation of RBs as shown in FIG. 18 or non-sequential allocation of RBs as shown in FIG. 2, and ceil (log ₂ (N ^UL _RB (N ^UL _RB +1) / 2)) bits. Here, ceil () represents a ceiling function, log ₂ () represents a logarithm with a base of 2, and N ^UL _RB represents the number of RBs included in the uplink system bandwidth. When the non-continuous arrangement flag is OFF (when the non-continuous arrangement flag indicates continuous arrangement), the ceil (log ₂ (N ^UL _RB (N ^UL _RB +1) / 2)) bit is used, as shown in FIG. In such continuously arranged RBs, the position of the RB having the lowest frequency among the assigned RBs and the number of consecutive RBs are designated to the mobile station apparatus 103. On the other hand, when the non-continuous arrangement flag is ON (when the non-continuous arrangement flag indicates non-continuous arrangement), the same ceil (log ₂ (N ^UL _RB (N ^UL _RB +1) / 2)) bit is used, As shown in FIG. 2, RBs in a discontinuous arrangement (Type 1) divided into a plurality of clusters are designated to the mobile station apparatus 103.

  As described above, by introducing the non-continuous arrangement flag, the resource allocation indicated by the Resource block assignment field can be switched between the resource allocation of the continuous arrangement and the resource allocation of the non-contiguous arrangement. For this reason, the freedom degree of scheduling improves and frequency utilization efficiency improves. In particular, when the discontinuous allocation flag is notified in the downlink control information format in the physical layer, the mobile station apparatus uses one type of size for both continuous resource allocation and non-continuous resource allocation ( By monitoring and decoding the downlink control information format (payload size or number of bits), while suppressing the number of downlink control information formats to be monitored and decoded (number of downlink control information formats with different number of bits) Since continuous allocation and non-continuous allocation resource allocation can be switched dynamically (for each subframe), the degree of freedom in scheduling is greatly improved. In addition, by suppressing the number of downlink control information formats to be monitored and decoded (number of downlink control information formats having different numbers of bits), the load when the mobile station apparatus monitors and decodes the downlink control information format is also increased. Can be reduced.

  Also, as shown in FIG. 3, the number of bits in the Resource block assignment field and other fields is the same in the Format0 and the Format0A, and the number of bits is the same in the Hopping flag of the Format0 and the Non-continuous flag of the Format0A. Furthermore, the Non-contiguous flag field of Format0A is arranged at the same position as the Hopping flag field of Format0. As a result, the read position of the Resource block assignment field and other fields can be shared by the Format0 and the Format0A.

FIG. 4 shows an example of resource allocation in a discontinuous arrangement according to the present embodiment. Here, two clusters are allocated, and each cluster is composed of four RBs in the frequency direction. As for RBs in the uplink band, a plurality of RBs that are continuous in the frequency direction are collected to form K RBGs (RB Groups). The base station apparatus 101 can reduce the number of bits necessary to designate RB allocation by designating RBs to be allocated in non-continuous resource allocation in units of RBGs. That is, by setting K to an appropriate value, the position of the non-continuous RBs can be expressed by ceil (log ₂ (N ^UL _RB (N ^UL _RB +1) / 2)) bits.

  FIG. 5 shows another example of non-contiguously allocated resource allocation according to the present embodiment. Here, two clusters are allocated, and each cluster is composed of four RBs in the frequency direction. The RB in the uplink band is composed of a plurality of RBs continuous in the frequency direction to form K RBGs, and a plurality of adjacent RBGs are grouped to form two BPs (Bandwidth Part). Is configured. The base station apparatus 101 can reduce the number of bits required to designate RB allocation by allocating one (or a predetermined number) clusters for each BP.

Here, the case where there are two BPs is shown. However, by appropriately setting the number of BPs, the positions of the non-continuous RBs are changed to ceil (log ₂ (N ^UL _RB (N ^UL _RB +1) / 2)). It can be expressed in bits. Here, the case where the RBG is designated for each BP has been described, but the present invention is not limited to this, and another designation method may be used as the cluster designation method in the BP. For example, a cluster is assigned to each BP, and the position of the RB having the lowest frequency among the assigned RBs and the number of consecutive RBs can be designated. In addition, although BP is comprised from a different frequency band here, it is not restricted to this, BP may overlap partially in a frequency domain. In addition, although an example in which two BPs are configured is shown here, the present invention is not limited to this, and three or more BPs may be configured.

  Next, monitoring and detection of downlink control information in the mobile station apparatus will be described. A cyclic redundancy check (CRC) is added to the downlink control information, and the CRC of the downlink control information is scrambled with an identifier (RNTI: Radio Network Temporary Identity). Depending on the RNTI used for the CRC of the downlink control information, the mobile station apparatus uses the PDCCH and / or PDSCH and / or PUSCH (transport channel or logical channel), the downlink control information format, or the PDSCH A transmission scheme or a transmission scheme of PUSCH can be determined. Note that the RNTI used for downlink control information for a specific mobile station apparatus is notified to the mobile station apparatus in advance. The RNTI is implicitly encoded with the CRC of the downlink control information included in the PDCCH. Specifically, the CRC is scrambled with the RNTI by performing a logical sum of a 16-bit CRC parity bit and a 16-bit RNTI.

  FIG. 6 shows an example of the search area according to the present embodiment. PDCCH is a first area, a common search area (CSS) that is an area monitored by a plurality of mobile station apparatuses, and a second area, which is an area monitored by some mobile station apparatuses. Are located in both search areas of the mobile station specific search area (USS: UE-specific Search Space) or in one of the search areas. The search area is composed of a plurality of resource elements dispersed in the third OFDM symbol from the first OFDM symbol of the subframe, for example. In LTE, the mobile station apparatus monitors both CSS and USS search areas as areas for decoding Format0. That is, the mobile station apparatus decodes Format0 in both CSS and USS search areas, confirms the CRC parity bits and RNTI included in the PDCCH, and confirms the presence or absence of downlink control information addressed to itself. .

  The mobile station apparatus according to the present embodiment decodes Format0A in CSS or Format0A in USS. Note that the base station apparatus recognizes that the mobile station apparatus decodes Format0 in CSS or Format0A in USS. Since the number of bits of Format0 and Format0A are equal to each other, the amount of computation required for the decoding process of the mobile station device does not increase even though the mobile station device monitors the downlink control information formats of both Format0 and Format0A. In addition, by arranging Format0 in CSS and Format0A in USS, the mobile station apparatus requires the decoding process of Format0 and Format0A compared to the case where the mobile station apparatus decodes Format0 and Format0A in both CSS and USS search areas. The calculation amount of the mobile station apparatus can be prevented from increasing. Thereby, the processing amount of a mobile station apparatus can be reduced. Moreover, the power consumption of the mobile station apparatus can be reduced.

  FIG. 7 shows another example of the search area according to the present embodiment. The CSS and USS shown here have some or all search areas overlapping. CSS and USS are composed of different resource elements for each number of OFDM symbols used for PDCCH. The CSS is composed of resource elements common to the mobile station devices managed by the base station device, and the USS is composed of independent resource elements for each mobile station device. Specifically, USS is comprised from the resource element selected according to RNTI allocated to the mobile station apparatus. Depending on the RNTI assigned to the mobile station apparatus, the resource element used for USS may overlap with the resource element used for CSS. In other words, there are cases where a candidate for arranging the PDCCH in the USS matches a candidate for arranging the PDCCH in the CSS.

  FIG. 8 shows an example of the correspondence between the bit values of the Hopping flag and the Non-contiguous flag and the states indicated by the values. This correspondence information is shared in advance between the base station apparatus and the mobile station apparatus. In the present embodiment, Format0 and Format0A have the same number of bits in the Resource block assignment field and the other fields, and the same number of bits in the Hopping flag of Format0 and the Non-continuous flag of Format0A. Furthermore, since the Non-contiguous flag field of Format0A is arranged at the same position as the Hopping flag field in Format0, the read position of the Resource block assignment field and other fields can be made common to Format0 and Format0A. .

  Further, when the bit value of the Hopping flag is 0, it indicates that hopping is OFF, and when it is 1, it indicates that it is ON. Further, when the bit value of the non-continuous flag is 0, it indicates that the resource is allocated continuously, and when it is 1, it indicates that the resource is allocated non-continuously. Thereby, when CSS and USS overlap, the base station apparatus sets the hopping flag of Format0 to be placed in the duplicated search area to 0, and sets the Non-continuous flag of Format0A to be placed in the duplicated search area to 0 Thus, the bit sequences of Format0 and Format0A arranged in the overlapping search areas have the same meaning.

  This will be described in more detail with reference to FIG. FIG. 9 shows the setting of hopping and resource allocation for a combination of a search area, a Hopping flag, and a non-contiguous flag. When the mobile station apparatus detects Format0 in the CSS, the mobile station apparatus confirms the Hopping flag. If the Hopping flag is 0, the hopping is OFF, the resource allocation is recognized as the continuously allocated resource allocation, and the Hopping flag is 1. If there is, the hopping is ON, and the resource allocation is recognized as a continuously allocated resource allocation. On the other hand, when the mobile station apparatus detects Format0A in the USS, the mobile station apparatus checks the non-continuous flag placed at the same position as the hopping flag in the format0. If the non-continuous flag is 0, the hopping is OFF. Resource allocation is recognized as continuous resource allocation, and if the non-continuous flag is 1, hopping is OFF, and resource allocation is recognized as non-continuous resource allocation.

  The Hopping flag field in Format0 and the Non-contiguous flag field in Format0A are arranged relatively at the same position in the downlink control information format, and the settings when the respective bit values are 0 are made common. As a result, the mobile station device that decodes Format0A in CSS or Format0A in USS recognizes that the DCI format detected in the search area where CSS and USS overlap is recognized as Format0A, When the bit value of the field corresponding to the Hopping flag field in Format0 and the Non-continuous flag field in Format0A is 0, the state set in each downlink control information format is that hopping is OFF, and resource allocation is continuously arranged. Since it is resource allocation, there is no need to separately use signaling for identifying Format0 and Format0A, and it is efficient without increasing overhead. Signaling is possible.

  In addition, the base station apparatus performs only the resource allocation in which the resource allocation is continuously arranged in the search area where the CSS and USS search areas overlap for the mobile station apparatus where the CSS and USS search areas overlap. The above effect can be further increased by transmitting the downlink control information format in which the bit value of the Hopping flag field in Format 0 or the Non-continuous flag field in Format 0A is 0 to the mobile station apparatus. be able to. In the CSS where the CSS and USS search areas do not overlap, the bit value of the Hopping flag field in the Format 0 may be 0 or 1, and in the USS where the CSS and USS search areas do not overlap, the Non-continuous in the Format 0A The bit value of the flag field may be 0 or 1.

  In this way, the communication system of the present invention makes the number of bits in the Hopping flag field in Format0 the same as the number of bits in the Non-continuous field in Format0A, and sets the Hopping flag field in Format0 and the Non-continuous field in Format0A at the same position. Place in the field. Thereby, the read position of the Resource block assignment field and other fields can be made the same in Format0 and Format0A. This effect can be obtained not only when Format0 and Format0A are arranged in different areas, but also when both are arranged in the same area.

  Further, the communication system of the present invention has a bit value so that the state when the Hopping flag field in the Format0 is a predetermined bit value and the state when the Non-continuous field in the Format0A are the same bit value are the same. And decide the correspondence of the state. In addition, the mobile station apparatus decodes Format0A in CSS or Format0A in USS. Thereby, the mobile station apparatus can monitor Format0 and Format0A without increasing the number of times of decoding the downlink control information format. Further, even when the CSS and USS search areas overlap, the mobile station apparatus can accurately acquire the uplink-related information without adding other signaling for identifying Format0 and Format0A. it can.

(Second Embodiment)
In the first embodiment, the case has been described in which Format0 and Format0A are used as the downlink control information format including uplink related information such as uplink scheduling information. In the second embodiment of the present invention, a case where Format0 is used will be described. Hereinafter, this embodiment will be described with reference to the drawings.

  The base station apparatus notifies the mobile station apparatus that supports non-contiguously allocated resource allocation in advance whether or not the setting of non-continuous allocated resource allocation is active. Based on the above, it is set in advance whether or not the setting of resource allocation for non-continuous arrangement is active. For example, this can be realized by using control information in an upper layer such as RRC (Radio Resource Control) signaling. RRC signaling is transmitted to the mobile station apparatus by PDSCH. A non-contiguous RB assignment field is prepared for RRC signaling, and a non-contiguously allocated resource allocation can be set depending on whether the value of this field is active. Before the base station apparatus notifies the mobile station apparatus whether or not the resource allocation setting for non-continuous arrangement is active, the mobile station apparatus determines that the resource allocation setting for non-continuous arrangement is not active, and the base station apparatus Also be aware of it.

  FIG. 10 shows an example of the downlink control information format according to this embodiment. The base station apparatus uses Format 0 for both the mobile station apparatus that performs only continuous resource allocation and the mobile station apparatus that can perform both continuous resource allocation and non-continuous resource allocation. Informs uplink related information. The mobile station apparatus in which the resource allocation of the non-continuous arrangement is not set to be active in advance confirms the first bit field of Format0 and acquires the contents of the subsequent bit fields.

When the hopping flag indicates hopping OFF, the mobile station apparatus uses the ceil (log ₂ (N ^UL _RB (N ^UL _RB +1) / 2)) bit of the Resource block assignment field to continuously arrange as shown in FIG. In the RB, the position of the RB having the lowest frequency among the assigned RBs and the number of consecutive RBs are designated. On the other hand, when the hopping flag indicates hopping ON, the mobile station apparatus uses the ceil (log ₂ (N ^UL _RB (N ^UL _RB +1) / 2)) bit as in the case where the hopping flag indicates hopping OFF. Different resource allocations in the frequency direction are specified in two slots in the subframe as shown in FIG.

  The mobile station apparatus in which the non-contiguously allocated resource allocation is set to be active in advance reads the Hopping flag field in Format0 as the Non-contiguous flag field. Also, the mobile station apparatus identifies whether the RB arrangement designation method indicated by the Resource block assignment field is Type 0 or Type 1 based on the value of the Non-continuous flag field (replaced Hopping flag).

That is, when the Non-contiguous flag field (replaced Hopping flag) is a value indicating hopping OFF, the mobile station apparatus uses the ceil (log ₂ (N ^UL _RB (N ^UL _RB +1) / 2) of the Resource block assignment field. ) Bits are used to designate the position of the RB having the lowest frequency among the assigned RBs and the number of consecutive RBs in the RBs arranged continuously as shown in FIG. On the other hand, when the non-continuous flag field (replaced hopping flag) is a value indicating hopping ON, the mobile station apparatus is the same as when the non-continuous flag field (replaced hopping flag) is a value indicating hopping OFF. ₂ is used to specify non-contiguously allocated resource allocation using ceil (log ₂ (N ^UL _RB (N ^UL _RB +1) / 2)) bits.

  In this way, the state in which non-continuous resource allocation is not set to active in advance and the Hopping flag field in Format 0 is a predetermined bit value (“X”, for example, “0”) A state in which continuous resource allocation is set to active and the non-contiguous flag field in Format 0 is the same bit value (“X”, for example, “0”) as the predetermined bit value is shared. Thus, the same effect as that of the first embodiment can be obtained. The mobile station apparatus can monitor the resource block assignment indicating continuous resource allocation and the downlink control information format including resource block assignment indicating non-contiguous resource allocation without increasing the number of times of decoding the downlink control information format.

  In addition, even when the search areas of CSS and USS overlap, other signaling for identifying Resource block assignment indicating continuous resource allocation and Resource block assignment indicating non-contiguous resource allocation is added. Therefore, the mobile station apparatus can accurately acquire the uplink related information. Here, in the mobile station apparatus in which the Hopping flag field of Format 0 is read as a non-continuous flag field in USS, and the Hoping flag field of Format 0 is read as a non-continuous flag field in CSS, the above effect can be obtained more particularly. it can.

(Third embodiment)
In the first embodiment, the case has been described in which the number of bits for designating consecutively arranged RB assignments in Format0 is the same as the number of bits for designating non-continuous arranged RB assignments in Format0A. In the third embodiment of the present invention, a case will be described in which the number of bits for designating continuous RB allocation in Format 0 is different from the number of bits for designating non-continuous RB allocation in Format 0A. Hereinafter, this embodiment will be described with reference to the drawings.

  FIG. 11 shows an example of a downlink control information format according to the present embodiment. The base station apparatus notifies the uplink related information using Format0 to the mobile station apparatus that performs only continuously allocated resource allocation, and uses Format0A for the mobile station apparatus that can perform non-continuous allocated resource allocation. To report uplink related information.

  The Format0A according to the present embodiment is a resource block assignment field that is a resource block assignment field that is arranged at the same position as the resource block assignment field of the format 0. In addition, a field that is partly padded with 0 in the format 0 field. Alternatively, resource allocation in a non-consecutive arrangement is designated using a Resource block assignment 2 field that is a field composed of all.

As in the first embodiment, Format0A can be used to designate both continuous RB allocation and non-continuous RB allocation. The top bit field of Format0A is a flag (Flag format 0A / format 1A) for identifying Format 0A and Format 1A. The mobile station apparatus first confirms this flag and knows the subsequent bit field configuration. The non-continuous allocation flag (Non-continuous flag) is a field indicating whether or not to perform resource allocation for non-continuous allocation. The Resource block assignment field is composed of ceil (log ₂ (N ^UL _RB (N ^UL _RB +1) / 2)) bits. When the non-continuous flag does not indicate that non-contiguously allocated resources are allocated (Type 0), the field at the same position as the field padded with 0 in Format 0 is padded with 0 as in Format 0.

On the other hand, when the non-continuous flag indicates that non-contiguously allocated resources are allocated (Type 1), a resource block assignment 2 field of N _EX bits is included in part or all of the field at the same position as the field padded with 0 in Format 0. Is set. When the non-continuous arrangement flag is OFF, the _RB of the continuous arrangement (Type 0) as shown in FIG. 18 using the ceil (log ₂ (N ^UL _RB (N ^UL _RB +1) / 2)) bit of the Resource block assignment 1 field. In, the position of the RB having the lowest frequency among the assigned RBs and the number of consecutive RBs are designated. On the other hand, when the non-continuous arrangement flag is ON, the total ceil (log ₂ (N ^UL _RB (N ^UL _RB +1) / 2)) + N _EX bit of the Resource block assignment 1 field and the Resource block assignment 2 field is used in FIG. A non-continuous arrangement (Type 1) RB divided into a plurality of clusters as shown is designated.

Here, in Format 0, the size of the field where 0 is padded is calculated from the number of bits of Format 0 and the number of bits of Format 1A. The number of bits of Format0 depends on the number of uplink RBs N ^UL _RB , and the number of bits of Format1A depends on the number of downlink RBs N ^DL _RB . For example, the number of bits of Format 0 is ceil (log ₂ (N ^UL _RB (N ^UL _RB +1) / 2)) + 14 bits, and the number of bits of Format 1A is ceil (log ₂ (N ^DL _RB (N ^DL _RB +1) / 2)) If it is +15 bits and N ^UL _RB and N ^DL _RB are equal, the field padded with 0 is 1 bit. In this case, this 1 bit is used as a Resource block assignment 2 field, and ceil (log ₂ (N ^UL _RB (N ^UL _RB +1) / 2)) + 1 bit is used to specify non-contiguous allocation of resources.

Note that the value of N _EX may be fixed in the system, or may be calculated from the number of uplink and downlink RBs. For example, in the case of being fixed in the system, the values of N ^UL _RB and N ^DL _RB may be limited so that a field in which 0 padding of at least N _EX bits occurs in Format0. In addition, when calculating from uplink and downlink _RBs , a method of calculating the number of bits of a field padded with 0 from N ^UL _RB and N ^DL _RB supported by the base station apparatus and setting this number of bits as N _EX Can be used. When calculating the value of N _EX from ^N _{UL RB} and ^N _{DL RB,} the number of bits required for resource allocation of the non-contiguous arrangement is designated depends on the ^N _{UL RB} and ^N _{DL RB.} At this time, the degree of freedom of scheduling can be improved by calculating the parameters used when the resource allocation of the non-consecutive arrangement is specified from N ^UL _RB and N ^DL _RB . For example, the number of RBGs in FIG. 4 and the number of BPs in FIG. 5 are calculated from N ^UL _RB and N ^DL _RB .

The number of bits of Format0 and the number of bits of Format1A have been described as being dependent on the values of N ^UL _RB and N ^DL _RB. However, if the number of bits depends on other system parameters, the value of N _EX or non-continuous resources Parameters used when assignment is designated may be calculated using these system parameters. For example, parameters used during case of FDD (Frequency Devision Duplex) and TDD (Time Devision Duplex) and the number of bits or the number of bits of Format1A of Format0 out different _resource allocation value or discontinuous arrangement of _{N EX} is designated By switching between FDD and TDD, more effects of the present invention can be obtained.

  As described above, in the communication system of the present invention, the number of bits in the Hopping flag field in Format0 is the same as the number of bits in the Non-continuous field in Format0A, and the resource block assignment field (Resource1 block field and Resource1 block field) are the same in the Format0 and the Format0A. The reading positions of other fields are made the same. Further, in the communication system of the present invention, the state when the Hopping flag field in Format 0 is a predetermined bit value (“Y”, for example, “00”) and the non-continuous field in Format 0A have the same bit value (“Y”). For example, the correspondence between the bit value and the state is determined so that the state in the case of “00”) is the same. The mobile station apparatus decodes Format0A in CSS or Format0A in USS. Thereby, Format0 and Format0A can be monitored without increasing the number of decoding times of the mobile station apparatus. Also, even when CSS and USS overlap, the mobile station apparatus can accurately acquire uplink related information without adding other signaling for identifying Format0 and Format0A.

  In the above description, the case where Format0 and Format0A are used has been described. However, the same effect can be obtained when Format0 is used as in the second embodiment. In this case, it may be notified in advance whether the setting of resource allocation for non-continuous arrangement is active, and the resource block assignment 2 field may be set when resource allocation for non-continuous arrangement is active.

(Fourth embodiment)
In the fourth embodiment of the present invention, a block configuration and a block function of a base station device and a mobile station device will be described. Hereinafter, this embodiment will be described with reference to the drawings.

  FIG. 12 shows an example of a block configuration of the base station apparatus according to this embodiment. The base station apparatus includes a scheduling unit 1201, a transmission unit (downlink transmission unit) 1202, a reception unit (uplink reception unit) 1203, and an antenna unit (base station antenna unit) 1204. The scheduling unit 1201 includes an uplink transmission resource information control unit 1205 and a downlink control channel management unit 1206. The transmission unit 1202 includes a control channel mapping unit 1207 and a radio transmission unit (downlink radio transmission unit) 1208. The reception unit 1203 includes a radio reception unit (uplink radio reception unit) 1209, a demapping unit 1210, a demodulation unit 1211, and a decoding unit 1212.

  FIG. 13 shows an example of a block configuration of the mobile station apparatus according to this embodiment. The mobile station apparatus includes a scheduling information management unit 1301, a reception unit (downlink reception unit) 1302, a transmission unit (uplink transmission unit) 1303, and an antenna unit (mobile station antenna unit) 1304. The scheduling information management unit 1301 includes a downlink monitoring management unit 1308 and an uplink transmission resource information management unit 1309. The transmission unit 1303 includes an encoding unit 1310, a modulation unit 1311, a mapping unit 1312, and a wireless transmission unit (uplink wireless transmission unit) 1313.

  First, processing in the base station apparatus will be described. The scheduling unit 1201 determines an uplink transmission resource to be allocated to each mobile station apparatus based on information acquired from an upper layer, and downlink control for notifying the mobile station apparatus of the determined uplink transmission resource Generate information. Also, the scheduling unit 1201 controls the separation of the received signal based on the determined uplink transmission resource when extracting data from the received signal received from the mobile station apparatus. The uplink transmission resource information control unit 1205 in the scheduling unit 1201 has a function of determining an uplink transmission resource to be allocated to each mobile station apparatus and a function of storing the determined uplink transmission resource. As described in the above embodiments, the uplink transmission resource arrangement can be a continuous arrangement or a discontinuous arrangement.

  The downlink control channel management unit 1206 has a function of generating downlink control information for notifying the mobile station apparatus, and a downlink for transmitting a physical downlink control channel for transmitting the generated downlink control information. The function of determining the transmission resource of When the uplink transmission resource determined by the scheduling unit 1201 is continuously arranged, the downlink control channel management unit 1206 generates downlink control information of Format0 or Format0A, and the transmission resource determined by the scheduling unit 1201 is discontinuous. In the case of arrangement, downlink control information of Format 0A is generated.

  In addition, when the downlink control channel management unit 1206 has generated the downlink control information of the Format 0, the downlink control channel management unit 1206 determines the downlink transmission resource for transmitting the Format 0 in the CSS, and when the control information of the Format 0A is generated, The downlink transmission resource for transmitting Format0A in the USS is determined. When the CSS and USS overlap is expected, the uplink transmission resource information control unit 1205 arranges Format0 or Format0A indicating the uplink transmission resource continuously arranged in the search area where the CSS and USS overlap. By making such a determination, the mobile station apparatus can acquire the uplink related information more accurately.

  The transmission unit 1202 generates and transmits a downlink transmission signal. The control channel mapping unit 1207 in the transmission unit 1202 has a function of mapping the downlink control information generated by the scheduling unit 1201 to transmission resources in the physical downlink control channel determined by the scheduling unit 1201. The radio transmission unit 1208 has a function of converting a digital signal including the mapped downlink control information into an analog signal, up-converting the signal to a radio frequency band, generating a radio transmission signal, and transmitting the radio signal via the antenna unit 1204.

  The reception unit 1203 acquires an uplink reception signal and extracts uplink data. A radio reception unit 1209 in the reception unit 1203 has a function of down-converting a reception signal received via the antenna unit 1204 and converting an analog signal into a digital signal. The demapping unit 1210 has a function of demapping received data in the uplink transmission resource determined by the scheduling unit 1201. The demodulation unit 1211 has a function of performing demodulation processing corresponding to the processing in the modulation unit 1311. The decoding unit 1212 has a function of performing error correction decoding processing corresponding to the processing in the encoding unit 1310.

  Next, processing in the mobile station apparatus will be described. The scheduling information management unit 1301 controls the search for the downlink control information notified from the base station apparatus based on the information acquired from the upper layer, decodes the received data acquired from the search area, and decodes the received data When the downlink control information addressed to itself is detected, the uplink transmission resource assignment assigned to the own apparatus is extracted from the downlink control information and stored. The downlink monitoring management unit 1308 in the scheduling information management unit 1301 uses a function for setting a search area for searching for a physical downlink control channel, and the CRC and RNTI added to the set search area and downlink control information. Thus, it has a function of determining whether or not the downlink control information is addressed to the own apparatus or the type of the downlink control information format.

  The downlink monitoring management unit 1308 determines that the detected downlink control information format is Format 0 when the set search area is CSS, and detects the downlink control information format when the set search area is USS. Is determined to be Format0A. In addition, the downlink monitoring management unit 1308 confirms the CRC and RNTI added to the detected downlink control information to determine whether the downlink control information is addressed to the own device or the use of the downlink control information. judge.

  When the downlink control information is addressed to the own device, the uplink transmission resource information management unit 1309 uses the format of the downlink control information and the scheduling information included in the downlink control information to set the uplink transmission resource. It has a function of extracting and storing this. The uplink transmission resource information management unit 1309, when the downlink control information format determined by the downlink monitoring management unit 1308 is Format0, or when the determined downlink control information format is Format0A and the non-continuous arrangement flag is not set. When continuous resource allocation is not indicated, information regarding allocation of uplink transmission resources continuously allocated is extracted from a predetermined bit field. Also, the uplink transmission resource information management unit 1309 is predetermined when the downlink control information format determined by the downlink monitoring management unit 1308 is Format0A and the non-continuous arrangement flag indicates resource assignment of non-consecutive arrangement. Information regarding the allocation of non-contiguous uplink transmission resources is extracted from the bit field.

  The receiving unit 1302 acquires a downlink reception signal and extracts downlink control information. A wireless reception unit 1305 in the reception unit 1302 has a function of down-converting a reception signal received via the antenna unit 1304 and converting an analog signal into a digital signal. The control channel demapping unit 1306 has a function of demapping received data in the search area set by the scheduling information management unit 1301. The control channel demodulation processing unit 1307 has a function of performing predetermined demodulation processing on the received data demapped by the scheduling information management unit 1301.

  The transmission unit 1303 generates and transmits an uplink transmission signal. The encoding unit 1310 in the transmission unit 1303 has a function of performing error correction encoding processing on uplink data. The modulation unit 1311 has a function of generating a modulation symbol sequence by digitally modulating uplink data that has been subjected to error correction coding. The mapping unit 1312 has a function of mapping the modulation symbol sequence to the uplink transmission resource extracted by the scheduling information management unit 1301. The radio transmission unit 1313 has a function of converting a digital signal including the mapped modulation symbol into an analog signal, up-converting the signal to a radio frequency band to generate a radio transmission signal, and transmitting the radio signal via the antenna unit 1304.

  As described above, the communication system of the present invention makes the number of bits of the Hopping flag field in the Format 0 and the number of bits in the Non-continuous field in the Format 0A the same, and the read position of the Resource block assignment field and other fields in the Format 0 and the Format 0A. To be the same. Further, the communication system of the present invention has a bit value so that the state when the Hopping flag field in the Format0 is a predetermined bit value and the state when the Non-continuous field in the Format0A are the same bit value are the same. And decide the correspondence of the state. In addition, the mobile station apparatus decodes Format0A in CSS or Format0A in USS. Thereby, the mobile station apparatus can monitor Format0 and Format0A without increasing the number of times of decoding the downlink control information format. Also, even when CSS and USS overlap, the mobile station apparatus can accurately acquire uplink related information without adding other signaling for identifying Format0 and Format0A.

  In the above description, the case where Format0 and Format0A are used has been described. However, the same effect can be obtained when Format0 is used as in the second embodiment. In this case, the base station apparatus notifies the mobile station apparatus via the upper layer beforehand whether or not the resource allocation setting for non-continuous arrangement is active, and the uplink transmission resource information management section 1309 in the scheduling information management section 1301 The resource allocation information included in the downlink control information format may be determined by referring to the setting in the higher layer whether the resource allocation is continuous allocation or non-continuous allocation.

  Moreover, although each said embodiment demonstrated the case where a physical downlink control channel was comprised from two area | regions, CSS and USS, it does not restrict to this. For example, a group-specific search space (GSS) unique to a group including CSS and one or more mobile station apparatuses may be used. Alternatively, the present invention can also be applied to a plurality of regions on different carriers in a physical downlink control channel composed of a plurality of regions on different carriers. Or the area | region arrange | positioned in the other channel which is not a physical downlink control channel may be sufficient. For example, when the downlink control information is notified using a predetermined area in the physical downlink shared channel, the present invention can be applied to the area in the physical downlink shared channel. Thus, if the base station apparatus arranges control information of different downlink control information formats for a plurality of regions that can be individually set, the same effects as those described in the above embodiments can be obtained. it can.

  Also, in each of the above embodiments, the effect of the present invention has been described in the case where a part or all of the search areas of CSS and USS overlap. However, the type of downlink control information format monitored by the mobile station apparatus is changed. In this case, the present invention can obtain the same effect even when the meaning of each field of the downlink control information format monitored by the mobile station apparatus is changed. In addition, the process which changes the kind of downlink control information format which a mobile station apparatus monitors, the meaning of each field of a downlink control information format, etc. is called RRC reconfiguration.

  The mobile station apparatus receives a message (RRC reconfiguration message) indicating that the type of the downlink control information format to be monitored and the meaning of each field of the downlink control information format to be monitored (RRC reconfiguration message) is received from the base station apparatus. A message (RRC reconfiguration complete message) indicating that the change of the type of the link control information format and the change of the meaning of each field of the downlink control information format to be monitored is completed is transmitted to the base station apparatus. The base station apparatus transmits the RRC reconfiguration message until it receives the RRC reconfiguration complete message (referred to as the transition period of the RRC reconfiguration), the type of downlink control information format monitored by the mobile station apparatus, and the monitored downlink The meaning of each field in the link control information format cannot be completely understood.

  When the mobile station apparatus changes the downlink control information format monitored in USS from Format0 to Format0A, when the mobile station apparatus changes the downlink control information format monitored in USS from Format0A to Format0, or when the mobile station apparatus When changing the meaning of each field of the Format 0 (Resource block assignment field) monitored in the USS, it is possible to prevent a mismatch in recognition between the mobile station apparatus and the base station apparatus regarding the information indicated by the downlink control information. preferable. The communication system according to the present invention can avoid a mismatch in recognition between the mobile station apparatus and the base station apparatus regarding the information indicated by the downlink control information. Thereby, an increase in interference and a delay in data transfer can be prevented.

  In the first embodiment, in the communication system of the present invention, the Hopping flag field in Format0 and the Non-contiguous flag field in Format0A are arranged at the same relative positions in the downlink control information format, and each bit value is 0. Keep the same settings for certain cases.

  As a result, in the transition period of RRC reconfiguration due to the change of the format 0 and format 0A of the downlink control information format monitored by the mobile station device, the base station device sets the bit value of the Hopping flag field in Format 0 or the Non-contiguous flag field in Format 0A. The downlink control information set to 0 is transmitted to the mobile station apparatus. Even if the DCI format detected by the mobile station apparatus is recognized as Format0 or Format0A, the Hopping flag field in Format0 and Non in Format0A -When the bit value of the field corresponding to the contiguous flag field is 0, each downlink The state set in the control information format is that hopping is OFF and the resource allocation is continuous resource allocation, so that a recognition mismatch between the mobile station apparatus and the base station apparatus regarding the information indicated by the downlink control information is avoided. be able to.

  In the second embodiment, in the communication system of the present invention, non-contiguously allocated resource allocation is not set to active in advance, and the Hopping flag field in Format 0 is a predetermined bit value (“X”, for example “0”). In some cases, resource allocation in a non-continuous arrangement is set to be active in advance, and the Non-continuous flag field in the Format0 is the same bit value (“X”, for example, “0”) as the predetermined bit value. Keep the state in some cases in common.

  Thereby, in the transition period of RRC reconfiguration due to a change in the meaning of Format 0 monitored by the mobile station device (active or non-active change in resource allocation in non-contiguous arrangement), the base station device indicates a field indicating the Hopping flag in Format 0 Alternatively, even when the downlink control information in which the bit value of the field indicating Non-continuous flag in Format 0 is set to 0 is transmitted to the mobile station apparatus, the mobile station apparatus recognizes that the resource allocation of the non-continuous arrangement is not active Even when recognizing that the resource allocation of the non-consecutive arrangement is not inactive, the field corresponding to the field indicating the Hopping flag and the field indicating the Non-continuous flag When the bit value is 0, the state to be set in each downlink control information format is that the hopping is OFF and the resource allocation is continuous resource allocation. It is possible to avoid recognition mismatch between base station apparatuses.

  The program that operates in the mobile station apparatus and the base station apparatus related to the present invention is a program (a program that causes a computer to function) that controls the CPU and the like so as to realize the functions of the above-described embodiments related to the present invention. Information handled by these devices is temporarily stored in the RAM at the time of processing, then stored in various ROMs and HDDs, read out by the CPU, and corrected and written as necessary. As a recording medium for storing the program, a semiconductor medium (for example, ROM, nonvolatile memory card, etc.), an optical recording medium (for example, DVD, MO, MD, CD, BD, etc.), a magnetic recording medium (for example, magnetic tape, Any of a flexible disk etc. may be sufficient. In addition, by executing the loaded program, not only the functions of the above-described embodiment are realized, but also based on the instructions of the program, the processing is performed in cooperation with the operating system or other application programs. The functions of the invention may be realized.

  In the case of distribution in the market, the program can be stored and distributed in a portable recording medium, or transferred to a server computer connected via a network such as the Internet. In this case, the storage device of the server computer is also included in the present invention.

  Moreover, you may implement | achieve part or all of the mobile station apparatus and base station apparatus in embodiment mentioned above as LSI which is typically an integrated circuit. Each functional block of the mobile station apparatus and the base station apparatus may be individually chipped, or a part or all of them may be integrated into a chip. Further, the method of circuit integration is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor. In addition, when an integrated circuit technology that replaces LSI appears due to progress in semiconductor technology, an integrated circuit based on the technology can also be used.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes design changes and the like within a scope not departing from the gist of the present invention.

  The present invention is suitable for use in a radio base station apparatus, a radio mobile station apparatus, a radio communication system, and a radio communication method.

DESCRIPTION OF SYMBOLS 101 ... Base station apparatus 102, 103 ... Mobile station apparatus 104, 105 ... Uplink transmission signal 106, 107 ... Downlink control information 1201 ... Scheduling part 1202 ... Transmission part 1203 ... Reception part 1204 ... Antenna part 1205 ... Uplink transmission resource Information control unit 1206 ... downlink control channel management unit 1207 ... control channel mapping unit 1208 ... radio transmission unit 1209 ... radio reception unit 1210 ... demapping unit 1211 ... demodulation unit 1212 ... decoding unit 1301 ... scheduling information management unit 1302 ... reception Unit 1303 ... transmission unit 1304 ... antenna unit 1305 ... radio reception unit 1306 ... control channel demapping unit 1307 ... control channel demodulation processing unit 1308 ... uplink monitoring management unit 1309 ... uplink transmission resource information management unit 131 ... encoding unit 1311 ... modulating unit 1312 ... mapping unit 1313 ... wireless transmission unit 1601 ... base station apparatus 1602 ... mobile station apparatus 1603 ... uplink transmission signal 1604 ... downlink control information

Claims (11)

  The control information of the first format is arranged in the resource in the first region in the physical downlink control channel, and the same number of bits as in the first format is assigned to the resource in the second region in the physical downlink control channel. A base station apparatus that arranges control information in a second format. The control information of the first format includes scheduling information that specifies uplink resources continuously arranged in the frequency direction,
2. The control information in the second format includes scheduling information for designating one of uplink resources arranged not continuously and uplink resources arranged continuously in the frequency direction. The base station apparatus as described in.   The control information of the second format includes non-consecutive arrangement flag information indicating which of the uplink resources arranged not continuously with the uplink resources arranged continuously in the frequency direction in the scheduling information. The base station apparatus according to claim 2, further comprising:   The control information of the second format does not include the predetermined information included in the control information of the first format, and the discontinuous arrangement flag information is arranged at a position where the predetermined information is arranged in the first format. The base station apparatus according to claim 3.   When the received data of the resource in the first area in the physical downlink control channel is decoded, the decoded received data is determined to be control information of the first format, and the second area in the physical downlink control channel is determined. A mobile station apparatus characterized in that when the received data of the resource is decoded, the decoded received data is determined to be control information of the second format having the same number of bits as the first format. From the control information of the first format, obtain the allocation of uplink resources arranged continuously in the frequency direction,
The allocation of any of the uplink resources arranged not continuously with the uplink resources arranged continuously in the frequency direction is acquired from the control information of the second format. Mobile station equipment. From the control information of the second format, discontinuous arrangement flag information indicating which of the uplink resources arranged not continuously with the uplink resources arranged continuously in the frequency direction is designated as the scheduling information Extract and
When the non-contiguous allocation flag information indicates uplink resources arranged continuously, the allocation of uplink resources continuously arranged in the frequency direction is acquired from the control information of the second format,
When the non-continuous allocation flag information indicates an uplink resource that is not consecutively allocated, the allocation of the uplink resource that is not consecutively allocated in the frequency direction is obtained from the control information of the second format, The mobile station apparatus according to claim 6.   When extracting the non-continuous arrangement flag information from the control information of the second format, from the same position as the position where the predetermined information different from the non-continuous arrangement flag information in the first format is arranged, 8. The mobile station apparatus according to claim 7, wherein arrangement flag information is extracted. A communication system for performing communication between a base station device and a mobile station device,
The base station device
The control information of the first format is arranged in the resource in the first region in the physical downlink control channel, and the same number of bits as in the first format is assigned to the resource in the second region in the physical downlink control channel. Arranging the control information of the second format having,
The mobile station device
When the received data of the resource in the first area is decoded, the decoded received data is determined as the control information of the first format, and when the received data of the resource in the second area is decoded, A communication system, characterized in that it is determined as control information in the second format. A communication method in a base station apparatus that communicates with a mobile station apparatus,
The control information of the first format is arranged in the resource in the first region in the physical downlink control channel, and the same number of bits as in the first format is assigned to the resource in the second region in the physical downlink control channel. A communication method characterized by arranging control information in a second format. A communication method in a mobile station apparatus that communicates with a base station apparatus,
When the received data of the resource in the first area in the physical downlink control channel is decoded, the decoded received data is determined to be control information of the first format, and the second area in the physical downlink control channel is determined. When the received data of the resource is decoded, it is determined that the decoded received data is control information of the second format having the same number of bits as the first format.