WO2019180962A1

WO2019180962A1 - Transmission device, reception device, radio communication method, and radio communication system

Info

Publication number: WO2019180962A1
Application number: PCT/JP2018/011901
Authority: WO
Inventors: 晋細川; 義博河▲崎▼
Original assignee: 富士通株式会社
Priority date: 2018-03-23
Filing date: 2018-03-23
Publication date: 2019-09-26

Abstract

[Problem] To provide a technique capable of performing appropriate communication even in a case of using a radio frame structure including radio resources having a plurality of different subcarrier spacings. [Solution] A transmission device of the present disclosure configured such that: the transmission device is able to radio-communicate with one or more reception devices by use of a plurality of subcarriers having different subcarrier spacings; for a second radio resource which is of radio resources in which the plurality of subcarriers are defined in the time axis direction and in the frequency axis direction and which is different, in the frequency axis direction, from a first radio resource having the subcarriers of a first subcarrier spacing and which has subcarriers of a second subcarrier spacing different from the first subcarrier spacing, the transmission device shares, with at least one of the one or more reception devices, setting information indicating a buffer area arranged in part of the subcarriers having the second subcarrier spacing the second radio resource has; and the transmission device allocates, according to the setting information, transmission data to the second radio resource and then transmits the transmission data.

Description

Transmitting apparatus, receiving apparatus, radio communication method, and radio communication system

The present invention relates to a transmission device, a reception device, a wireless communication method, and a wireless communication system in a next-generation mobile communication system.

In recent years, assuming various use cases for a wireless communication system (which can also be referred to as a mobile communication system) such as a mobile phone system (cellular system), the wireless communication (which can also be referred to as mobile communication) is further increased in speed and capacity. The next generation wireless communication technology is being discussed in order to make it easier. For example, 3GPP (3rd Generation Partnership Project), which is a standardization organization, has developed a communication standard called LTE (Long Term Evolution (also referred to as LTE Rel. 8)) and LTE-Advanced (based on LTE wireless communication technology). LTE-Advanced) (which can also be referred to as LTE-A, LTE Rel. 10, 11 or 12) has already been established, and studies for expanding its functions are being continuously conducted. . For example, discussions have been held on the standardization of the fifth generation mobile communication system (also referred to as 5G system) that realizes the contents of the operation scenarios and technical requirements presented by ITU-R (International Telecommunication Union Radio Communications communications sector). .

In the next generation mobile communication systems after the 5G system, for example, services such as tactile communication and augmented reality that require different levels of communication performance are expected. In order to cope with such new services, or to cope with the fact that propagation path characteristics and the like can vary greatly depending on the frequency band, the 5G system adopts a design policy that can change the radio frame structure flexibly. ing. For example, LTE Rel. In 8-12 (which can also be referred to as a 4G system), the subcarrier spacing (SCS) is fixed at 15 kHz, whereas in the 5G system, signals with different subcarrier spacing are transmitted simultaneously in parallel. It is being considered.

International Publication No. 2017/164222

As described above, the 5G system adopts a design policy that can flexibly change the radio frame structure. For example, in the radio frame structure of the 5G system, it is conceivable to change the SCS and the symbol length for each radio resource. Such a set of parameters defining the radio frame structure may be referred to as “numerology”. In other words, the radio frame structure of the 5G system may include radio resources defined by a plurality of different nuclologies (also referred to as a plurality of different subcarrier spacings (SCS)).

However, in the discussion on standardization of the 5G system, basic system design is mainly studied, and it is said that sufficient implementation technology for realizing the 5G system wireless service has been sufficiently studied. hard. For example, the actual situation is that there is not much discussion about the problems in implementing radio communication using a radio frame structure including radio resources defined by a plurality of different subcarrier intervals (SCS).

The disclosed technology is a transmitter, a receiver, a radio communication method, a radio, and a radio apparatus that can appropriately perform radio communication even when a radio frame structure including radio resources defined by a plurality of different subcarrier intervals (SCS) is used. An object is to provide a communication system.

According to one aspect of the disclosure, a transmission device capable of wireless communication with one or more receiving devices by using a plurality of subcarriers having at least one or more subcarrier intervals, wherein the plurality of subcarriers are in a time axis direction. Among the radio resources partitioned by the frequency axis direction, the first radio resource having subcarriers at the first subcarrier interval is a second radio resource different in the frequency axis direction and different from the first subcarrier interval. For the second radio resource having subcarriers having a second subcarrier interval, a buffer area arranged in at least some of the subcarriers having the second subcarrier interval that the second radio resource has Share setting information with at least one of the one or more receiving devices and follow the setting information for the second radio resource. Configured to wirelessly transmit assign transmission data.

According to one aspect of the disclosed technology, even when a radio frame structure including radio resources defined by a plurality of different subcarrier intervals (SCS) is used, radio communication can be performed appropriately.

FIG. 1 is a diagram illustrating an example of an operation mode of a plurality of different subcarrier intervals (SCS) in the wireless communication system according to the first embodiment. FIG. 2 is a diagram illustrating an example of a radio frame structure in the radio communication system according to the first embodiment. FIG. 3 is a diagram illustrating an example of a frequency-time-space structure of subframes in the wireless communication system according to the first embodiment. FIG. 4 is a diagram illustrating an example of inter-SCS interference that may occur in the frequency space-time structure of subframes in the wireless communication system according to the first embodiment. FIG. 5 is a diagram illustrating an example of a buffer region arranged in a part of the radio resource in the frequency space-time structure of the subframe in the radio communication system according to the first embodiment. FIG. 6 is a diagram illustrating an example of a sequence of sharing setting information between the wireless terminal 10 and the wireless base station 20 in the wireless communication system 1 according to the first embodiment. FIG. 7 is a diagram schematically illustrating an example of a configuration of setting information shared between the wireless terminal 10 and the wireless base station 20 in the wireless communication system 1 according to the first embodiment. FIG. 8 is a diagram illustrating an example of a process flow in the transmission device of the wireless communication system according to the first embodiment. FIG. 9 is a diagram illustrating an example of a process flow in the reception device of the wireless communication system according to the first embodiment. FIG. 10 is a diagram illustrating an example of the configuration of the SS / PBCH block as the first radio resource according to the second embodiment. FIG. 11 is a diagram illustrating an example of arrangement of SS / PBCH blocks in the radio frame structure of the radio communication system according to the second embodiment. FIG. 12 is a diagram illustrating an example of a buffer area arranged in a part of the radio resource in the frequency time-space structure of the subframe in the radio communication system according to the second embodiment. FIG. 13 is a diagram schematically illustrating an example of a configuration of setting information shared between the transmission device and the reception device in the wireless communication system according to the second embodiment. FIG. 14 is a diagram schematically illustrating a further example of the configuration of the setting information shared between the transmission device and the reception device in the wireless communication system according to the second embodiment. FIG. 15 is a diagram illustrating an example of a wireless communication sequence in the wireless communication system 1 according to the second embodiment. FIG. 16 is a diagram illustrating an example of a buffer area arranged in a part of the radio resource in the frequency space-time structure of the subframe in the radio communication system according to the third embodiment. FIG. 17 is a diagram illustrating an example of a wireless communication sequence in the wireless communication system 1 according to the third embodiment. FIG. 18 is a diagram illustrating an example of a buffer area arranged in a part of the radio resource in the frequency spatio-temporal structure of the subframe in the radio communication system according to the fourth embodiment. FIG. 19 is a diagram schematically illustrating an example of a configuration of setting information related to a buffer area according to the fourth embodiment. FIG. 20 is a diagram illustrating an example of a wireless communication sequence in the wireless communication system 1 according to the fourth embodiment. FIG. 21 is a diagram illustrating an example of a hardware configuration of the wireless terminal 10 and the wireless base station 20 in the wireless communication system 1.

As mentioned above, the discussion on the 5G system has just started. For example, the actual situation is that there is not much discussion about the problems in implementing radio communication using a radio frame structure including radio resources defined by a plurality of different subcarrier intervals (SCS).

As a result of intensive studies on the radio frame structure of such a 5G system, the inventors of the present invention can also be referred to as a plurality of different subcarrier intervals (SCS) (inter-SCS) due to fluctuations in the propagation path environment and the like. ) Found that interference can occur. In the present disclosure, such interference is referred to as inter-SCS interference for convenience of explanation.

For example, in a 5G system, a guard band (also referred to as a sub guard band) provided between a plurality of different subcarrier intervals (SCS) in order to improve radio resource utilization efficiency (also referred to as frequency utilization efficiency). It is conceivable to narrow down. Therefore, in the 5G system, it can be said that the influence of inter-SCS interference tends to occur beyond the narrowed guard band. In other words, when a radio frame structure including radio resources defined by a plurality of different subcarrier intervals (SCS) is used, a portion in which radio resources overlap in the frequency direction between a plurality of different subcarrier intervals (SCS). Even if not, the influence of inter-SCS interference may occur.

From the viewpoint of frequency band, it can be said that the 5G system is likely to be affected by inter-SCS interference. For example, allocation of not only UHF (Ultra High Frequency) band and SHF (Special High Frequency) band but also EHF (Extremely High Frequency) band such as 80 GHz band as a frequency band used in 5G system is being considered. The propagation path environment and the like can vary greatly depending on the frequency band actually used. Therefore, in a 5G system, it can be said that the influence of inter-SCS interference is likely to occur because the propagation path environment and the like greatly vary according to the frequency band actually used. In other words, even if radio resources do not have overlapping portions in the frequency direction between a plurality of different subcarrier intervals (SCS), the influence of inter-SCS interference may occur depending on the actually used frequency band. I can say that.

From the viewpoint of frequency bandwidth, it can be said that the 5G system is likely to be affected by inter-SCS interference. For example, the maximum value of the frequency bandwidth used in the 5G system is 400 MHz (TR （38.802 section 5.3). For this reason, the propagation path environment and the like can vary greatly depending on the position of the radio resource in the frequency direction. In other words, even if there are no overlapping portions in the frequency axis direction between a plurality of radio resources having different subcarrier intervals (SCS), the influence of inter-SCS interference occurs depending on the position of the radio resource in the frequency axis direction. I can say that I get.

However, in the discussion on the standardization of the 5G system, a design policy capable of flexibly changing the radio frame structure has been adopted, but no specific measure for suppressing the influence of the above-described inter-SCS interference has been determined. As a result, when a radio frame structure including radio resources defined by a plurality of different subcarrier intervals (SCS) is used, the communication quality of the radio service deteriorates due to the influence of inter-SCS interference, and the data Transmission delay due to retransmission may occur.

The inventors of the present invention have such technical restrictions as eMBB (enhanced Mobile Broadband) that is an ultra-high-speed and large-capacity data transmission service, and URLLC (Ultra-Reliable and low Low Latency) that is ultra-reliable and low-delay communication. Communication) and mMTC (massive Machine Type Communications), which is a wireless service with very large number of connections, has acquired unique knowledge that it can be an obstacle to realizing various wireless services. Note that the 5G system in the present disclosure is an example of a mobile communication system (also referred to as a next-generation radio communication system) that supports a radio frame structure including radio resources defined by a plurality of different subcarrier intervals (SCS). . In a conventional mobile communication system (for example, 4G system), when extended to support a radio frame structure including radio resources defined by a plurality of different subcarrier spacings (SCS), the above-described inter-SCS interference may occur. Note that problems can arise.

Hereinafter, modes for carrying out the present invention (hereinafter also referred to as embodiments and examples) will be described with reference to the drawings. The configuration of the embodiment described below is an example for embodying the technical idea of the present invention, and is not intended to limit the present invention to the configuration of this embodiment. The present invention can be equally applied to other embodiments included in the scope. For example, the names of various signals such as PDCSH (Physical Downlink Shared Channel), PBCH (Physical Downlink Shared Channel), and PUSCH (Physical Uplink Shared Channel) may be changed in future 5G system specifications. It is done. It should be noted that this disclosure is not intended to limit the components of the invention to those using these names.

Needless to say, the following embodiments may be implemented in combination as appropriate. Here, the entire contents of Non-Patent Document 1 to Non-Patent Document 38 are incorporated herein by reference.

<Example 1> In the wireless communication system 1 according to Example 1, when using a radio frame structure including a plurality of radio resources defined by a plurality of different subcarrier intervals (SCS), the first subcarrier interval The first radio resource having a subcarrier is a second radio resource that is different in the frequency axis direction, and the second radio resource having a subcarrier having a second subcarrier interval different from the first subcarrier interval is Setting information indicating that transmission data is not allocated to a part of subcarriers with a carrier interval is shared between the transmission device and the reception device. Then, according to the shared setting information, transmission data is allocated to the second radio resource, and is wirelessly transmitted from the transmission device to the reception device. As a result, even when a radio frame structure including radio resources defined by a plurality of different subcarrier intervals (SCS) is used, inter-SCS interference can be suppressed, and the transmission apparatus can appropriately perform radio communication with the reception apparatus. It can be carried out.

FIG. 1 is a diagram illustrating an example of an operation mode of a plurality of different subcarrier intervals (SCS) in the wireless communication system according to the first embodiment. In the example of FIG. 1, as a plurality of different subcarrier intervals (SCS) (which may also be referred to as a plurality of different numbers), radio resources (first radio resources, first subcarrier intervals (SCS # 1)) having subcarriers A first BWP (which may also be referred to as BandWidth Part)) and a radio resource (which may also be referred to as a second radio resource, a second BWP) having subcarriers (which may also be referred to as subcarriers) having a second subcarrier interval. Is arranged on the frequency axis. The first radio resource and the second radio resource exemplified in FIG. 1 are examples of radio resources arranged close to each other on the frequency axis. Note that the plurality of different subcarrier intervals (SCS) in the present disclosure is not limited to two SCSs. For example, radio resources (also referred to as third radio resources) having subcarriers with a third subcarrier interval different from the first subcarrier interval and the second subcarrier interval may be arranged.

In the first radio resource of FIG. 1, each of the n subcarriers is arranged on the frequency axis at the first subcarrier interval (A21). In the second radio resource of FIG. 1, each of the m subcarriers is arranged on the frequency axis at the second subcarrier interval (A22). The number n of subcarriers of the first radio resource and the number m of subcarriers of the second radio resource can be determined according to the channel bandwidth allocated to each radio resource. In the discussion on the standardization of 5G systems, it is considered that a bandwidth of a maximum of 400 MHz can be allocated. Note that the example of FIG. 1 schematically shows the arrangement of subcarriers, and may be different from the power distribution on the frequency axis of each subcarrier. For example, each subcarrier may be arranged by a frequency division multiplexing method or may be arranged by an orthogonal frequency division multiplexing method.

In the example of FIG. 1, the second subcarrier interval (A22) is larger than the first subcarrier interval (A21). Here, the subcarrier interval may correspond to the center frequency interval between two adjacent subcarriers. In the discussion on standardization of the 5G system, 15 kHz, 30 kHz, 60 kHz, 120 kHz, 240 kHz, 15 × 2 ^μ kHz (μ is a positive integer including 0), and the like are considered as subcarrier intervals.

In the example of FIG. 1, a guard band (which may also be referred to as a sub guard band or a sub guard interval) (A23) is arranged between the first radio resource and the second radio resource. In other words, the first radio resource illustrated in FIG. 1 is arranged close to the second radio resource via the subguard band (A23). In one aspect, it can be said that the first radio resource and the second radio resource are adjacent to each other via the subguard band (A23). As described above, in the discussion on the standardization of the 5G system, the subguard band (A23) is narrowed in order to improve the frequency utilization efficiency. For example, the arrangement of the sub guard band (A23) may be omitted.

FIG. 2 is a diagram illustrating an example of a radio frame structure in the radio communication system according to the first embodiment. In the example of FIG. 2, one radio frame has a time length of 10 ms (milliseconds) and includes 10 subframes.

1 subframe has a time length of 1 ms, and the internal structure differs depending on the subcarrier time interval (SCS) (which may also be referred to as “Numerology”). For example, in the discussion on standardization of a 5G system, one subframe with an SCS of 15 kHz consists of one slot (one slot), and one subframe with an SCS of 30 kHz consists of two slots (two slots), One subframe with an SCS of 60 kHz consists of 4 slots (4 slots), one subframe with an SCS of 120 kHz consists of 16 slots (16 slots), and one subframe with an SCS of 240 kHz has 32 slots It is considered to be composed of (32 slots).

In the example of FIG. 2, the subframe having the first subcarrier interval (SCS # 1) is configured by one slot. In other words, according to the trend of the discussion regarding the standardization of the 5G system described above, the first subcarrier interval (SCS # 1) in FIG. 2 is, for example, 15 kHz. In the example of FIG. 2, the subframe having the second subcarrier interval (SCS # 2) is composed of two slots. In other words, according to the trend of the discussion regarding the standardization of the 5G system described above, the second subcarrier interval (SCS # 2) in FIG. 2 is, for example, 30 kHz.

As illustrated in FIG. 2, the time length of one slot may be different depending on the subcarrier interval (which may also be referred to as SCS or Numerology) of radio resources. For example, if the first subcarrier interval (SCS # 1) in FIG. 2 is 15 kHz and the second subcarrier interval (SCS # 2) is 30 kHz, the slot of the first subcarrier interval is 1 ms, A slot with two subcarrier intervals is 0.5 ms. In other words, the time length of one slot is shorter as the number of slots included in one subframe increases.

In the radio frame structure illustrated in FIG. 2, one slot is composed of 14 symbols (14 symbols) at any subcarrier interval (SCS). In other words, the time length of one symbol may vary depending on the subcarrier interval.

FIG. 3 is a diagram illustrating an example of a frequency-time-space structure of a subframe in the wireless communication system according to the first embodiment. In the example of FIG. 3, a plurality of radio resources (also referred to as resource elements, RE (Resource Element)) partitioned by both the time axis direction and the frequency axis direction are shown. In other words, one cell (one cell) in the lattice-like frequency space-time structure illustrated in FIG. 3 may correspond to one resource element (one resource element). One resource element may correspond to one symbol in the time axis direction. Further, one resource element can correspond to one subcarrier (one subcarrier) in the frequency axis direction. In the illustration of FIG. 3, the number of cells in the frequency axis direction is schematically shown, and can be changed according to the bandwidth of the radio resource used in the radio communication system. In the example of FIG. 3, the number of squares in the frequency axis direction can be changed according to the trend of the discussion regarding standardization of the 5G system.

In the example of FIG. 3, the first subcarrier interval (SCS # 1) is 15 kHz, which is narrower than the second subcarrier interval (SCS # 2) of 30 kHz. For this reason, in the frequency axis direction, the cells of the first subcarrier interval (SCS # 1) are narrower than the cells of the second subcarrier interval (SCS # 2).

In the example of FIG. 3, the subframe with the first subcarrier interval (SCS # 1) has one slot (B10), and the subframe with the second subcarrier interval (SCS # 2) has two slots ( B20, B21). Therefore, in the time axis direction, the grid of the first subcarrier interval (SCS # 1) is longer than the grid of the second subcarrier interval (SCS # 2).

FIG. 4 is a diagram illustrating an example of inter-SCS interference that may occur in the frequency space-time structure of subframes in the wireless communication system according to the first embodiment. In the example of FIG. 4, in a partial region (B101) of the radio resource (B10) with the first subcarrier interval (SCS # 1), the inter-SCS from the radio resource with the second subcarrier interval (SCS # 2). An example of how the influence of interference occurs is shown. Further, in the example of FIG. 4, in the partial area (B201, B211) of the radio resource (B20, B21) of the second subcarrier interval (SCS # 2), the radio of the first subcarrier interval (SCS # 1) is performed. An example of how the influence of inter-SCS interference from resources occurs is shown. In the illustration of FIG. 4, the range in which the influence due to the inter-SCS interference occurs is an example, and may change according to the fluctuation of the propagation path environment and the like.

FIG. 5 is a diagram illustrating an example of a buffer area arranged in a part of the radio resource in the frequency space-time structure of the subframe in the radio communication system according to the first embodiment. In the example of FIG. 5, some areas (B201, B211) of the radio resources (B20, B21) of the second subcarrier interval (SCS # 2) are set as buffer areas according to the setting information.

The buffer area (B201, B211) is a part of the radio resource, but transmission data is not allocated. In other words, the reception device of the wireless communication system can exclude the radio resource corresponding to the buffer area (B201, B211) set according to the setting information shared with the transmission device from the decoding target. The buffer area (B201, B211) may be referred to as a data unallocated area, an unallocated area, a data unallocated radio resource, an unallocated radio resource, or the like. Further, the buffer area (B201, B211) may have a side surface as a sub guard band extended according to the setting information shared with the transmission apparatus. In other words, the buffer areas (B201, B211) may be referred to as a guard area, a guard band area, a sub guard band area, an extended guard band area, an extended sub guard band area, or the like.

In the example of FIG. 5, the second subcarrier interval (SCS # 2) is caused by the buffer regions (B201, B211) arranged in a part of the radio resources (B20, B21) of the second subcarrier interval (SCS # 2). 2) The influence of inter-SCS interference from the radio resource (B20, B21) to the radio resource (B10) in the first subcarrier interval (SCS # 1) can be suppressed. In other words, the transmission power is not allocated to the buffer area (B201, B211) of the second radio resource (B20, B21), thereby reducing the signal power of the subcarrier corresponding to the buffer area (B201, B211). It can be expected that the influence of inter-SCS interference on the first radio resource adjacent to the second radio resource on the frequency axis is suppressed. It can also be expected that the buffer area (B201, B211) suppresses the influence of inter-SCS interference from the first radio resource to the second radio resource.

The range of such buffer areas (B201, B211) may be determined in advance at the time of designing the transmission device and the reception device. Alternatively, from the viewpoint of improving frequency utilization efficiency, the range of the buffer area (B201, B211) is set by setting information that is dynamically shared between the transmission device and the reception device during operation of the wireless communication system. May be. As described above, the range in which the influence due to the inter-SCS interference occurs can vary depending on the fluctuation of the propagation path environment and the like. For this reason, in consideration of improving the frequency utilization efficiency, setting information related to the buffer area (B201, B211) suitable for the situation during operation of the wireless communication system is dynamically shared between the transmission device and the reception device. May be preferred.

FIG. 6 is a diagram illustrating an example of a sequence for sharing setting information between the wireless terminal 10 and the wireless base station 20 in the wireless communication system 1 according to the first embodiment. It should be noted that the wireless terminal 10 and the wireless base station 20 illustrated in FIG. 6 may have both aspects of a receiving device and a transmitting device, respectively. For example, the radio terminal 10 corresponds to a receiving device in the downlink and can correspond to a transmitting device in the uplink. Further, the radio base station 20 corresponds to a transmission device in the downlink and can correspond to a reception device in the uplink. For example, the wireless terminal 10 and the wireless base station 20 may be communication devices that comply with the 5G system standard.

The setting information sharing sequence illustrated in FIG. 6 may be executed at an arbitrary timing. In other words, the radio resource used for transmitting the setting information may be any type. For example, when setting information is transmitted by radio resources of PBCH (Physical Broadcast CHannel) repeatedly broadcast from the radio base station 20 at a predetermined cycle, the sequence illustrated in FIG. 6 is linked to the cycle in which the PBCH is mapped. May be executed. Information transmitted through the PBCH that is repeatedly broadcast at such a predetermined cycle includes, for example, MIB (Master Information Block) and SIB1 (System Information Block 1). Information may be stored.

As illustrated in FIG. 6, in the setting information sharing sequence, the radio base station 20 transmits the setting information using an arbitrary radio resource (S1). Thereby, the wireless terminal 10 can share the setting information with the wireless base station 20 by receiving the setting information transmitted from the wireless base station 20. Note that, in the case of uplink, the radio base station 20 has a side as a receiving device, but may transmit setting information as illustrated in FIG. In other words, in the uplink, the radio terminal 10 has an aspect as a transmission device, but may receive setting information from the radio base station 20 as illustrated in FIG.

As described above, the radio resource for transmitting the setting information may be any radio resource in the radio communication system 1. For example, the setting information may be stored in an RRC (Radio Resource Control) message transmitted from the radio base station 20. Examples of such RRC messages include an RRC connection setup (RRCConnectionSetup) message and an RRC connection reconfiguration (RRCConnectionReconfiguration) message.

Also, for example, the radio base station 20 may store and transmit setting information in downlink control information (which may also be referred to as DCI (Downlink Control Information)). In this case, the DCI in which the setting information is stored may be mapped to PDCCH (Physical Downlink Control CHannel) or may be mapped to EPDCCH (Enhanced PDCCH). The method of storing the setting information in DCI and transmitting it is suitable when the radio communication system 1 allows the arrangement of the first radio resource and the second radio resource to be dynamically changed. For example, when notifying the allocation of the second radio resource for transmission data (which may also be referred to as user data) to the radio terminal 10, the DCI having information related to the allocation of the second radio resource relates to the buffer area in the second radio resource. The setting information may be notified. Here, the second radio resource in which the buffer area is arranged may be a downlink radio resource or an uplink radio resource. In other words, although DCI is named as downlink control information, it can be used not only for notification of downlink resource allocation but also for notification of uplink resource allocation.

FIG. 7 is a diagram schematically illustrating an example of a configuration of setting information shared between the wireless terminal 10 and the wireless base station 20 in the wireless communication system 1 according to the first embodiment. The setting information (T10) illustrated in FIG. 7 includes buffer area information (T11) indicating information related to the buffer area. The buffer area information (T11) includes, for example, data unallocated area information, unallocated area information, data unallocated radio resource information, unallocated radio resource information, guard area information, guard band area information, sub-guard band area information, extension It may be referred to as guard band region information, extended sub guard band region information, or the like.

The buffer area information (T11) illustrated in FIG. 7 may include information indicating a radio resource set as the buffer area. The buffer area information (T11) is information for specifying a radio resource set as a buffer area on the frequency axis (also referred to as frequency information), and information for specifying the radio resource on the time axis (also referred to as time information). Or a combination of frequency information and time information.

The frequency information includes, for example, information indicating the position on the frequency axis of a radio resource set as a buffer area (may be referred to as frequency position information, frequency offset information, etc.), and the width of the radio resource on the frequency axis. Information (which may be referred to as frequency bandwidth information, bandwidth information, etc.) or a combination of these information.

The time information includes, for example, information indicating the position on the time axis of the radio resource set as the buffer area (may be referred to as time position information, time offset information, etc.), and the width of the radio resource on the time axis. May be information (which may be referred to as time width information, duration information, etc.) or a combination of these information.

FIG. 8 is a diagram illustrating an example of a process flow in the transmission device of the wireless communication system according to the first embodiment. The process flow illustrated in FIG. 8 may be executed at any timing during operation of the wireless communication system.

For example, in the radio frame structure, the transmission device may have a second radio resource arranged in a region different from the first radio resource at the first subcarrier interval in the frequency axis direction, and the second sub resource different from the first subcarrier interval. It is determined whether there are subcarriers with a carrier interval (S101). In S101, when the subcarrier interval of the subcarriers included in the second radio resource is the same as the first subcarrier interval of the first radio resource, the transmitting apparatus differs from the first subcarrier interval in the second radio resource. It may be determined that there are no subcarriers at the second subcarrier interval (NO in S101). Note that the determination process of S101 may be executed at least once after the transmission apparatus is activated. In other words, the transmitting apparatus may execute the determination process of S101 after executing the determination process of S101 once, and until the radio frame structure is changed, or may not execute the determination process of S101. May be. When the transmitting apparatus is the uplink radio terminal 10, the determination process in S101 may be omitted. In other words, the uplink transmission apparatus may omit the determination process of S101.

In S101, when it is determined that the second radio resource has subcarriers with a second subcarrier interval different from the first subcarrier interval of the first radio resource (YES in S101), the transmission device The setting information regarding the buffer area arranged in a part of the area is shared with the receiving apparatus (S102). In S102, for example, in the case of downlink, the radio base station 20 having an aspect as a transmission device may transmit setting information regarding the buffer area. In S102, for example, in the case of uplink, the radio terminal 10 having the aspect as the transmission apparatus may receive the setting information related to the buffer area from the radio base station 20 having the aspect as the reception apparatus.

The transmitting apparatus sets a buffer area in a partial area of the second radio resource according to the setting information shared with the receiving apparatus, and transmits transmission data (S103). In S103, for example, the transmission apparatus may map the transmission data to the radio resource while avoiding the radio resource corresponding to the buffer area. Alternatively, in S103, for example, the transmission device may reduce the transmission power of the radio resource corresponding to the buffer area, for example, to a substantially zero value among the second radio resources to which the transmission data is mapped. In other words, in S103, the transmission apparatus may perform processing (which may also be referred to as puncturing or rate matching) for thinning out transmission data mapped to the radio resource corresponding to the buffer area.

On the other hand, if it is determined in S101 that the second radio resource does not have a subcarrier having a second subcarrier interval different from the first subcarrier interval of the first radio resource (NO in S101), the transmission device Transmission data may be transmitted without arranging a buffer area in the radio resource (S104).

The above is an example of the processing flow in the transmission apparatus of the wireless communication system according to the first embodiment.

FIG. 9 is a diagram illustrating an example of a process flow in the reception device of the wireless communication system according to the first embodiment. The process flow illustrated in FIG. 9 may be executed at any timing during operation of the wireless communication system.

For example, in the radio frame structure, the receiving apparatus has a second radio resource arranged in a region different in the frequency axis direction from the first radio resource at the first subcarrier interval, and the second sub resource different from the first subcarrier interval. It is determined whether there are subcarriers with a carrier interval (S201). In S201, the receiving apparatus determines that the second radio resource is different from the first subcarrier interval when the subcarrier interval of the subcarriers included in the second radio resource is the same as the first subcarrier interval of the first radio resource. It may be determined that there are no subcarriers at the second subcarrier interval (NO in S201). Note that the determination processing in S201 may be executed only once after the reception apparatus is activated. In other words, the receiving apparatus may execute the determination process of S201 after executing the determination process of S201 once, and until the radio frame structure is changed, or may not execute the determination process of S201. May be. When the receiving device is the downlink radio terminal 10, the determination process in S201 may be omitted. In other words, the downlink receiving apparatus may omit the determination process of S201.

In S201, when it is determined that the second radio resource has subcarriers with a second subcarrier interval different from the first subcarrier interval of the first radio resource (YES in S201), the receiving device The setting information regarding the buffer area arranged in a part of the area is shared with the transmission apparatus (S202). In S202, for example, in the case of downlink, the radio terminal 10 having the aspect as the reception apparatus may receive the setting information regarding the buffer area from the radio base station 20 having the aspect as the transmission apparatus. In S202, for example, in the case of uplink, the radio base station 20 having a side as a receiving apparatus may transmit setting information regarding the buffer area.

The receiving device receives the transmission data from the transmitting device by excluding the radio resource corresponding to the buffer area in the second radio resource from the decoding target according to the setting information shared with the transmitting device (S203). In S203, the reception apparatus may perform processing (also referred to as puncturing or de-rate matching) of thinning out transmission data (which may also be referred to as reception data) extracted from radio resources corresponding to the buffer area.

On the other hand, if it is determined in S201 that the second radio resource does not have a subcarrier having a second subcarrier interval different from the first subcarrier interval of the first radio resource (NO in S201), the receiving device The transmission data mapped to the second radio resource may be received by the transmission device (S204).

The above is an example of the processing flow in the receiving apparatus of the wireless communication system according to the first embodiment.

According to one aspect of the first embodiment disclosed above, when a radio frame structure including radio resources defined by a plurality of different subcarrier intervals (SCS) is used, the first radio resources at the first subcarrier interval are used. A buffer area is arranged in the second radio resource having a second subcarrier interval different from that of the first subcarrier. By arranging the buffer area in the second radio resource, it is possible to suppress the influence of inter-SCS interference between the second radio resource and the first radio resource. As a result, even when a radio frame structure including radio resources defined by a plurality of different subcarrier intervals (SCS) is used, radio communication can be performed appropriately. Such an operation is useful for realizing various wireless services such as eMBB, URLLC, and mMTC in the 5G system.

According to another aspect of the first embodiment disclosed above, the range of the buffer area is set by setting information dynamically shared between the transmission device and the reception device during operation of the wireless communication system. The Therefore, the arrangement of the buffer areas can be dynamically changed according to the setting information related to the buffer areas suitable for the situation during operation of the wireless communication system. As a result, even when a radio frame structure including radio resources defined by a plurality of different subcarrier intervals (SCS) is used, radio communication can be performed more appropriately. Such an operation is useful for realizing various wireless services such as eMBB, URLLC, and mMTC in the 5G system.

<Example 2> In Example 2, a more specific application example is shown about a 1st radio | wireless resource and a 2nd radio | wireless resource. In the application example of the second embodiment, the first radio resource is an SS / PBCH (Synchronization Signal / Physical Broad CHannel) block which is a kind of downlink radio resource. The second radio resource is a downlink radio resource, and is a radio resource other than the SS / PBCH block, and may be, for example, a PDSCH (Physical Downlink Shared 得る CHannel) that can be used for transmitting user data. In the case of downlink, the receiving device may correspond to the radio terminal 10 and the transmitting device may correspond to the radio base station 20.

FIG. 10 is a diagram illustrating an example of the configuration of the SS / PBCH block as the first radio resource according to the second embodiment. In FIG. 10, the time axis is arranged in the horizontal direction, and the frequency axis is arranged in the vertical direction.

The SS / PBCH block (B30) illustrated in FIG. 10 is composed of four symbols (also referred to as OFDM symbols), and each symbol is composed of 240 subcarriers. In other words, the SS / PBCH block (B30) illustrated in FIG. 10 has 960 (4 × 240 = 960) resource elements (which may also be referred to as REs).

Also, the SS / PBCH block includes a signal arranged in a radio resource at a predetermined position, such as PSS (Primary Synchronization Signal), SSS (Secondary Synchronization Signal), PBCH (Physical Broad Channel). For example, PSS and SSS are signals that can be used to ensure synchronization between the receiving device and the transmitting device, as the name synchronization signal is given. In other words, the SS / PBCH block is a signal that can be used to establish and maintain synchronization between the receiving device and the transmitting device. Therefore, the degradation of the transmission quality of the SS / PBCH block can affect the establishment / maintenance of synchronization between the receiving device and the transmitting device. Synchronization between the receiving device and the transmitting device is important for appropriately performing wireless communication between the receiving device and the transmitting device. In other words, when synchronization between the reception device and the transmission device fails, it is difficult to appropriately perform wireless communication between the reception device and the transmission device.

From the viewpoint of emphasizing ensuring synchronization between the receiving device and the transmitting device, the second radio resource arranged at a different position on the frequency axis from the downlink first radio resource (SS / PBCH block) It may be advantageous to arrange the buffer area over the buffer area in the first radio resource. This is because the buffer area arranged in the second radio resource is expected to prevent deterioration of the transmission quality of the SS / PBCH block due to inter-SCS interference. Such an SS / PBCH block can be repeatedly transmitted at a predetermined period.

FIG. 11 is a diagram illustrating an example of the arrangement of SS / PBCH blocks in the radio frame structure of the radio communication system according to the second embodiment. In the example of FIG. 11, similarly to the example of FIG. 2, one radio frame has a time length of 10 ms (milliseconds) and is configured by 10 subframes. In such a radio frame structure, the SS / PBCH block can be arranged, for example, in the first two subframes (subframe [0], subframe [1]) in one radio frame. Note that the position of the subframe in which the SS / PBCH block is arranged is not limited to the example of FIG. 11 and can be changed according to the operation mode of the wireless communication system. The variations of the SS / PBCH block arrangement are detailed in TS38.213 § 4.1 Cell search, for example.

The subframe illustrated in FIG. 11 has a time length of 1 ms and is composed of one slot. Note that, as described above, the internal structure of a subframe may change according to a subcarrier time interval (SCS) (also referred to as numeric).

In FIG. 11, the internal structure of subframe [0] in which the SS / PBCH block is arranged is shown in an enlarged manner. The internal structure of subframe [1] is the same as that of subframe [0], and is not shown. As illustrated in FIG. 11, the SS / PBCH block includes four symbol groups from symbol [2] to symbol [5], and symbols [8] to [11] among 14 symbols included in one slot. ] Of four symbol groups. In the radio frame structure illustrated in FIG. 11, the subframe [0] and the subframe [1] have the same internal structure, and thus the SS / PBCH block appears four times in one radio frame. In other words, in the radio frame structure illustrated in FIG. 11, four SS / PBCH blocks (which may also be referred to as first radio resources) are arranged.

FIG. 12 is a diagram illustrating an example of a buffer area arranged in a part of the radio resource in the frequency space-time structure of the subframe in the radio communication system according to the second embodiment. In the example of FIG. 12, the above-described SS / PBCH blocks (B30-1 and B30-2) are arranged as the first radio resource at the first subcarrier interval (SCS # 1). In the example of FIG. 12, PDSCH (B40, B41) to which user data or the like can be mapped as the second radio resource at the second subcarrier interval (SCS # 2) is arranged. In the example of FIG. 12, the slot (1 slot1for SCS # 2) of the second subcarrier interval (SCS # 2) has a time axis that is longer than the slot of the first subcarrier interval (SCS # 1) (1 slot for SCS # 1). Half length in direction.

In FIG. 12, the second subcarrier interval (SCS # 2) is different from the first subcarrier interval (SCS # 1) of the SS / PBCH block (B30-1, B30-2) which is the first radio resource. Buffer areas (B401, B411) are arranged in a part of the radio resources (B40, B41). As described above, the buffer areas (B401, B411) are partially included in the second radio resources (B40, B41) that may be affected by the inter-SCS interference on the first radio resources (B30-1, B30-2). ) Can be expected to properly establish and maintain synchronization between the transmission device and the reception device in the wireless communication system.

The buffer area (B401, B411) may be arranged in the second radio resource, for example, in an area close to the first radio resource. The buffer areas (B401, B411) illustrated in FIG. 12 are arranged at positions adjacent to the first radio resources (B30-1, B30-2) in the frequency axis direction. Here, adjoining in the frequency axis direction does not necessarily mean that the arrangement of both in the frequency axis direction is continuous. For example, if the first radio resource (B30-1, B30-2) and the buffer area (B401, B411) have proximity in the frequency axis direction to such an extent that the influence of inter-SCS interference can be suppressed. Good.

Further, the buffer areas (B401, B411) illustrated in FIG. 12 are arranged at positions overlapping with the first radio resources (B30-1, B30-2) in the time axis direction. Here, overlapping in the time axis direction does not necessarily mean that both arrangements have the same time width in the time axis direction. For example, the first radio resource (B30-1) and the buffer area (B401) need only have redundancy in the time axis direction to such an extent that the influence of inter-SCS interference can be suppressed. In other words, the buffer area (B401) may be shorter or longer in the time axis direction than the first radio resource (B30-1). The same applies to the relationship between the first radio resource (B30-2) and the buffer area (B411).

In the illustration of FIG. 12, the position and size of the buffer region (B401, B411) in the frequency axis direction are indicated by the offset (offset) and the width (width). The offset (offset) indicates the position of the buffer region (B401, B411) from the reference point in the frequency axis direction in the frequency time-space structure of the subframe shown in FIG. In FIG. 12, the offset (offset) may be the same as the value indicating the position of the second radio resource (B40, B41). The width indicates the length (width) of the buffer region (B401, B411) in the frequency axis direction.

In the illustration of FIG. 12, the buffer area (B401, B411) indicates the position and size in the time axis direction by the offset (offset-1, offset-2) and the width (width-1, width-2). It is. The positions and sizes of the buffer areas (B401, B411) in the time axis direction may be determined based on, for example, the arrangement pattern of SS / PBCH blocks (also referred to as first radio resources) illustrated in FIG. Good. As described above, the SS / PBCH block arrangement pattern can be changed according to the operation mode of the wireless communication system. In other words, the start position and width of the buffer area (B401, B411) in the time axis direction may be determined according to the operation mode of the wireless communication system. The relationship between the operation mode of the wireless communication system and the SS / PBCH block arrangement variation is detailed in, for example, TS38.213 §4.1 Cell search. Also, the subframe to which the arrangement pattern of the buffer areas (B401, B411) illustrated in FIG. 12 is applied may be determined based on the subframe to which the SS / PBCH block arrangement pattern is applied. The subframe to which the SS / PBCH block arrangement pattern is applied is detailed in, for example, TS38.213 §4.1 Cell search.

FIG. 13 is a diagram schematically illustrating an example of a configuration of setting information shared between the transmission device and the reception device in the wireless communication system according to the second embodiment. The setting information (T10A) illustrated in FIG. 13 includes buffer area information (T11A) indicating information on the buffer areas (B401, B411). The buffer area information (T11A) includes, for example, data unallocated area information, unallocated area information, data unallocated radio resource information, unallocated radio resource information, guard area information, guard band area information, sub-guard band area information, extension It may be referred to as guard band region information, extended sub guard band region information, or the like.

The buffer area information (T11A) illustrated in FIG. 13 includes, as information indicating radio resources set as the buffer areas (B401, B411), a buffer area frequency offset (T11A-1) and a buffer area frequency bandwidth (T11A). -2).

Buffer area frequency offset (T11A-1) indicates, for example, the start position of the buffer area from the reference point in the frequency axis direction of the radio frame in the radio communication system. In other words, a value indicating the start position of the buffer area in the frequency axis direction can be stored in the field of the buffer area frequency offset (T11A-1) in the buffer area information (T11A). The buffer region frequency offset (T11A-1) is, for example, an RB (Resource Block) number (which may also be referred to as a value in RB units) or an RE (Resource Element) number (which may also be referred to as a value in RE units). Also good. The buffer region frequency offset (T11A-1) is not necessarily expressed by one parameter, and may be expressed by a plurality of parameters. In other words, the buffer region frequency offset (T11A-1) only needs to indicate the start position of the buffer region in the frequency axis direction, and any data representation may be used. For example, the buffer area frequency offset (T11A-1) may indicate the start position of the buffer area in the frequency axis direction by a bitmap having a bit string of a plurality of digits.

Buffer area frequency bandwidth (T11A-2) indicates the length (width) of the buffer area in the frequency axis direction. In other words, a value indicating the length (width) of the buffer area in the frequency axis direction is stored in the field of the buffer area frequency bandwidth (T11A-2) in the buffer area information (T11A). The buffer region frequency bandwidth (T11A-2) may be, for example, the number of RBs or the number of REs. The buffer region frequency bandwidth (T11A-2) is not necessarily expressed by one parameter, and may be expressed by a plurality of parameters. In other words, the buffer region frequency bandwidth (T11A-2) only needs to indicate the length (width) of the buffer region in the frequency axis direction, and any data representation may be used. For example, the buffer region frequency bandwidth (T11A-2) may indicate the length (width) of the buffer region in the frequency axis direction by a bitmap having a bit string of a plurality of digits. In this case, one bitmap may serve as both the buffer domain frequency offset (T11A-1) and the buffer domain frequency bandwidth (T11A-2).

FIG. 14 is a diagram schematically illustrating another example of the configuration of the setting information shared between the transmission device and the reception device in the wireless communication system according to the second embodiment. The setting information (T10A) illustrated in FIG. 14 includes buffer area information (T11A) indicating information regarding the buffer areas (B401, B411), as in FIG. The buffer area information (T11A) in FIG. 14 specifies information (also referred to as frequency information) for specifying the buffer area (B401, B411) on the frequency axis, and specifies the buffer area (B401, B411) on the time axis. Information (which may also be referred to as time information). In the example of FIG. 14, the frequency information includes a buffer region frequency offset (T11A-1) and a buffer region frequency bandwidth (T11A-2). In the example of FIG. 14, the time information includes a buffer area time offset (T11A-3) and a buffer area time width (T11A-4). In the example of FIG. 14, the time information is illustrated as having only one set of information of the buffer area time offset (T11A-3) and the buffer area time width (T11A-4). The disclosure is not limited to this. For example, two or more information sets of the buffer area time offset (T11A-3) and the buffer area time width (T11A-4) may be provided. The same applies to the frequency information. The content of the frequency information in FIG. 14 is the same as the buffer region frequency offset (T11A-1) and the buffer region frequency bandwidth (T11A-2) illustrated in FIG. .

Buffer area time offset (T11A-3) indicates, for example, the position of the buffer area from the reference point in the time axis direction of the frequency time space structure of the subframe. In other words, the buffer area time offset (T11A-3) field in the buffer area information (T11A) can store a value indicating the position of the buffer area in the time axis direction. The buffer area time offset (T11A-3) may be, for example, a symbol number. The buffer area time offset (T11A-3) is not necessarily expressed by one parameter, and may be expressed by a plurality of parameters. In other words, the buffer area time offset (T11A-3) is only required to indicate the position of the buffer area in the time axis direction, and any data representation may be used. For example, the buffer area time offset (T11A-3) may indicate the position of the buffer area in the time axis direction by a bitmap having a bit string of a plurality of digits.

Buffer area time width (T11A-4) indicates the size (also referred to as length and width) of the buffer area in the time axis direction. In other words, the buffer area time width (T11A-4) field in the buffer area information (T11A) stores a value indicating the size of the buffer area in the time axis direction. The buffer area time width (T11A-4) may be, for example, the number of symbols. The buffer area time width (T11A-4) is not necessarily expressed by one parameter, and may be expressed by a plurality of parameters. In other words, the buffer area time width (T11A-4) only needs to indicate the length (width) of the buffer area in the time axis direction, and any data representation may be used. For example, the buffer area time width (T11A-4) may indicate the length (width) of the buffer area in the time axis direction by a bit map having a bit string of a plurality of digits. In this case, one bitmap may serve as both the buffer area time offset (T11A-3) and the buffer area time width (T11A-4). In the example of FIG. 12, since the second radio resources (B40, B41) of the second subcarrier interval (SCS # 2) include 2 slots (2 slots) per subframe, a total of 28 symbols (14 (Symbol × 2 slots = 28 symbols). In this case, the arrangement of the buffer areas (B401, B411) in one subframe can be indicated by a bitmap of at least 28 bits.

As described above, the position and size of the buffer area according to the second embodiment may be determined based on the arrangement of the SS / PBCH block that is the first radio resource. For example, as the setting information regarding the position and size of the buffer area in the time axis direction according to the second embodiment, the setting information regarding the arrangement of the SS / PBCH blocks may be used. In other words, the setting information related to the SS / PBCH block arrangement can be used as setting information related to the position and size of the buffer area in the time axis direction according to the second embodiment.

FIG. 15 is a diagram illustrating an example of a wireless communication sequence in the wireless communication system 1 according to the second embodiment. The radio communication system 1 illustrated in FIG. 15 includes a radio terminal 10 as a downlink reception device and a radio base station 20 as a downlink transmission device. For example, the wireless terminal 10 and the wireless base station 20 may be communication devices that comply with the 5G system standard.

The sequence illustrated in FIG. 15 is an excerpt of a part of a series of processes related to downlink data transmission. In the illustration of FIG. 15, for example, the processing related to the connection establishment between the wireless terminal 10 and the wireless base station 20 is not shown.

In FIG. 15, for example, the radio base station 20 executes downlink scheduling processing and allocates downlink radio resources (second radio resources) to downlink data (DL data) addressed to the radio terminal 10 ( S21). Then, the radio base station 20 allows the second radio resource allocated to the downlink data to influence the inter-SCS interference on the SS / PBCH block (first radio resource) and / or the frequency axis direction. Or you may determine whether it has proximity in a time-axis direction (S22). The first radio resource is a radio resource having a first subcarrier interval, and the second radio resource is a radio resource having a second subcarrier interval different from the first subcarrier interval.

In S22, the radio base station 20, for example, when the second radio resource is arranged in the same subframe as the subframe in which the SS / PBCH block (first radio resource) is arranged, It may be determined that the influence of inter-SCS interference may be exerted on the SS / PBCH block (first radio resource).

When the radio base station 20 determines that the second radio resource can affect inter-SCS interference on the SS / PBCH block (first radio resource), the radio base station 20 is arranged in a part of the second radio resource. The setting information (Buffer area configuration) related to the buffer area is transmitted to the wireless terminal 10 by DCI, for example (S23). In other words, the radio base station 20 may store setting information (Buffer area configuration) related to the buffer area in a predetermined information field of DCI. The DCI may also store information (DL 第二 scheduling information) related to the second radio resource allocated to the downlink data addressed to the radio terminal 10. Such DCI may be transmitted by PDCCH, for example, and may be transmitted by EPDCCH. The setting information (Buffer area configuration) related to the buffer area according to the second embodiment is obtained when the wireless terminal 10 as the downlink receiving device receives the setting information from the wireless base station 20 as the downlink transmitting device. It is shared between the terminal 10 and the radio base station 20. In this case, the DCI format of S23 may be, for example, Format1_0 or Format1_1, and is detailed in TS38.212 §7.3.1.27.3DCI formats for scheduling of PDSCH. In other words, the DCI in S23 may have a configuration in which setting information indicating the buffer area according to the present embodiment is added to the DCI format detailed in TS38.212 §7.3.1.2.

The radio base station 20 arranges the buffer area in the second radio resource for mapping the downlink data (DL data) according to the setting information (Buffer area configuration) related to the buffer area, and includes the buffer area and includes the downlink data (DL The second radio resource (PDSCH (with buffer area)) to which data is mapped and the first radio resource (SS / PBCH) are transmitted (S24). Accordingly, it is possible to suppress the influence of inter-SCS interference on the first radio resource (SS / PBCH) while transmitting downlink data (DL （data) addressed to the radio terminal 10 using the second radio resource. In other words, the buffer area suppresses the influence of inter-SCS interference from the first radio resource to the second radio resource while suppressing the influence of inter-SCS interference from the second radio resource to the first radio resource. obtain.

The wireless terminal 10 receives downlink data (DL data) from the second wireless resource (PDSCH (with Buffer area)) including the buffer area according to the setting information (Buffer area configuration) regarding the buffer area received in S23. obtain. Note that the first radio resource (SS / PBCH) transmitted in S24 may be received by another radio terminal not shown in FIG. In other words, the radio terminal 10 shown in FIG. 15 may or may not receive the first radio resource (SS / PBCH) transmitted in S24.

In the example of FIG. 15, the DCI transmitted in S23 and the second radio resource and the first radio resource transmitted in S24 may be transmitted in the same subframe or transmitted in different subframes. May be.

The above is a specific application example of the first radio resource and the second radio resource in the second embodiment. Since the points omitted in the second embodiment are the same as those in the first embodiment, refer to the description of the first embodiment as appropriate.

According to one aspect of the second embodiment disclosed above, when a radio frame structure including radio resources defined by a plurality of different subcarrier intervals (SCS) is used, the first radio resources having the first subcarrier interval are used. A buffer area is arranged in the second radio resource having a second subcarrier interval different from that of the first subcarrier. By arranging the buffer area in the second radio resource, it is possible to suppress the influence of inter-SCS interference between the second radio resource and the first radio resource. As a result, even when a radio frame structure including radio resources defined by a plurality of different subcarrier intervals (SCS) is used, radio communication can be performed appropriately. Such an operation is useful for realizing various wireless services such as eMBB, URLLC, and mMTC in the 5G system.

According to another aspect of the second embodiment disclosed above, the range of the buffer area is set by setting information dynamically shared between the transmission device and the reception device during operation of the wireless communication system. The Therefore, the arrangement of the buffer areas can be dynamically changed according to the setting information related to the buffer areas suitable for the situation during operation of the wireless communication system. As a result, even when a radio frame structure including radio resources defined by a plurality of different subcarrier intervals (SCS) is used, radio communication can be performed more appropriately. Such an operation is useful for realizing various wireless services such as eMBB, URLLC, and mMTC in the 5G system.

According to still another aspect of the second embodiment disclosed above, the first radio resource (SS / PBCH block) of the synchronization signal used for the synchronization process between the transmission device and the reception device of the wireless communication system The buffer region is arranged in a partial region of the second radio resource (for example, PDSCH) that can influence the inter-SCS interference. The first radio resource (SS / PBCH block) while suppressing the influence of inter-SCS interference from the second radio resource to the first radio resource (SS / PBCH block) by the buffer area arranged in the second radio resource The influence of inter-SCS interference on the second radio resource can be suppressed. As a result, even when a radio frame structure including radio resources defined by a plurality of different subcarrier intervals (SCS) is used, radio communication can be performed appropriately. Such an operation is useful for realizing various wireless services such as eMBB, URLLC, and mMTC in the 5G system.

<Example 3> In Example 3, another specific application example is shown about a 1st radio | wireless resource and a 2nd radio | wireless resource. In the application example of the third embodiment, the first radio resource is PRACH (Physical Random Access CHannel) which is a kind of uplink radio resource. The second radio resource is an uplink radio resource and is a radio resource other than the PRACH, and may be, for example, a PUSCH (Physical Uplink Shared） CHannel) that can be used for transmission of user data. In the case of uplink, the receiving device may correspond to the radio base station 20, and the transmitting device may correspond to the radio terminal 10.

The PRACH resource is used when the radio terminal 10 that is an uplink transmission device establishes a connection with the radio base station 20 that is an uplink reception device or performs resynchronization by initial access or handover. obtain. When the transmission quality of the PRACH resource decreases due to inter-SCS interference, connection establishment between the transmission device (wireless terminal 10) and the reception device (wireless base station 20) may fail. When the connection establishment between the transmission device (wireless terminal 10) and the reception device (wireless base station 20) fails, it is difficult to appropriately perform wireless communication between the transmission device and the reception device. . Therefore, for example, from the viewpoint of emphasizing connection establishment between the receiving device and the transmitting device, the second radio resource in the second radio resource arranged at a different position on the frequency axis from the uplink first radio resource (PRACH). It may be more advantageous to arrange the buffer area in the first radio resource than to arrange the buffer area in the first radio resource. This is because the buffer area arranged in the second radio resource is expected to prevent the deterioration of the transmission quality of the PRACH resource due to the inter-SCS interference.

FIG. 16 is a diagram illustrating an example of a buffer area arranged in a part of the radio resource in the frequency time-space structure of the subframe in the radio communication system according to the third embodiment. In the example of FIG. 16, PRACH (C20) is arrange | positioned as a 1st radio | wireless resource of a 1st subcarrier space | interval (SCS # 1). In the example of FIG. 16, PUSCH (C10, C11) to which user data and the like can be mapped as the second radio resource at the second subcarrier interval (SCS # 2) is arranged. In the example of FIG. 16, the slot (1 slot for SCS # 2) of the second subcarrier interval (SCS # 2) has a time axis greater than that of the first subcarrier interval (SCS # 1) (1 slot for SCS # 1). Half length in direction.

In FIG. 16, a part of the second radio resource (C10) having a second subcarrier interval (SCS # 2) different from the first subcarrier interval (SCS # 1) of PRACH (C20) that is the first radio resource. A buffer area (C101) is arranged. In this way, the buffer communication area (C101) is arranged in a partial area of the second radio resource (C10) that can affect the first radio resource (C20) due to the inter-SCS interference, so that the radio communication system The process regarding the initial connection between the transmitting apparatus and the receiving apparatus can be appropriately executed.

The buffer area (C101) may be arranged in the second radio resource, for example, in an area close to the first radio resource (PRACH). The buffer region (C101) illustrated in FIG. 16 is arranged at a position adjacent to the first radio resource (C20) in the frequency axis direction. Here, adjoining in the frequency axis direction does not necessarily mean that the arrangement of both in the frequency axis direction is continuous. For example, the first radio resource (C20) and the buffer region (C101) need only have proximity in the frequency axis direction to such an extent that the influence of inter-SCS interference can be suppressed.

Further, the buffer area (C101) illustrated in FIG. 16 is arranged at a position overlapping the first radio resource (C20) in the time axis direction. Here, overlapping in the time axis direction does not necessarily mean that both arrangements have the same time width in the time axis direction. For example, the first radio resource (C20) and the buffer area (C101) need only have redundancy in the time axis direction to such an extent that the influence of inter-SCS interference can be suppressed. In other words, the buffer area (C101) may be shorter or longer in the time axis direction than the first radio resource (C20).

In the illustration of FIG. 16, the position and size of the buffer region (C101) in the frequency axis direction are indicated by an offset in the frequency axis direction and a width. The offset (offset) in the frequency axis direction indicates the position of the buffer region (C101) from the reference point in the frequency axis direction in the frequency spatio-temporal structure of the subframe shown in FIG. In FIG. 16, the offset (offset) in the frequency axis direction may be the same as the value indicating the position of the second radio resource (C10). The width indicates the size (width) of the buffer region (C101) in the frequency axis direction.

In the illustration of FIG. 16, the position and size of the buffer region (C101) in the time axis direction are indicated by the offset in the time axis direction and the width. The position and size of the buffer region (C101) in the time axis direction may be determined based on, for example, an arrangement pattern of PRACH (C20) at the first subcarrier interval (SCS # 1). The arrangement pattern of the PRACH (C20) can be changed according to the operation mode of the wireless communication system. In other words, the position (offset) and size (width) of the buffer region (C101) in the time axis direction may be determined according to the operation mode of the wireless communication system. The relationship between the operation mode of the wireless communication system and the PRACH (C20) arrangement variation is detailed in, for example, TS 38.211 §6.3.3.26.3Mapping to physical resources. Further, the subframe to which the arrangement pattern of the buffer area (C101) illustrated in FIG. 16 is applied may be determined based on the subframe to which the arrangement pattern of PRACH (C20) is applied. The subframe to which the PRACH (C20) arrangement pattern is applied is detailed in, for example, TS38.211 Table 6.3.3.2-2: Random access configurations for FR1 and pared spectrum.

Since the setting information regarding the buffer area according to the third embodiment is the same as that of the first and second embodiments, detailed description thereof is omitted. In other words, the setting information regarding the buffer area is shared between the transmission device and the reception device in the wireless communication system according to the third embodiment. In the third embodiment, a buffer area is arranged in the uplink radio resource, the transmission apparatus may correspond to the radio terminal 10, and the reception apparatus may correspond to the radio base station 20. In this case, the setting information related to the buffer area according to the third embodiment may be transmitted from the radio base station 20 that is the reception device to the radio terminal 10 that is the transmission device.

As described above, the position and size of the buffer area according to the third embodiment may be determined based on the arrangement of the PRACH resource that is the first radio resource. For example, as the setting information related to the position and size of the buffer area in the time axis direction according to the third embodiment, the setting information related to the PRACH resource may be used. In other words, the setting information regarding the PRACH resource can be used as setting information regarding the position and size of the buffer area according to the third embodiment in the time axis direction.

FIG. 17 is a diagram illustrating an example of a wireless communication sequence in the wireless communication system 1 according to the third embodiment. The radio communication system 1 illustrated in FIG. 17 includes a radio terminal 10A as an uplink transmission device, a radio base station 20 as an uplink reception device, and other radio terminals 10B. The radio terminal 10A, the radio terminal 10B, and the radio base station 20 may be communication devices that comply with, for example, a 5G system standard.

The sequence illustrated in FIG. 17 is an excerpt of a part of a series of processes related to uplink data transmission. In the illustration of FIG. 17, for example, the processing related to connection establishment between the wireless terminal 10 </ b> A and the wireless base station 20 is not shown.

In FIG. 17, the radio base station 20 transmits system information (System information) including setting information (PRACH configuration) related to the first radio resource (PRACH) to the

radio terminals

10A and 10B (S31). The radio terminals 10 </ b> A and 10 </ b> B can know the setting information (PRACH 情報 configuration) related to the first radio resource (PRACH) by receiving the system information transmitted from the radio base station 20. In S31, the radio base station 20 may individually transmit the system information to the

radio terminals

10A and 10B, or may broadcast the system information to the

radio terminals

10A and 10B using a broadcast channel (PBCH). . In FIG. 17, system information is an example of a signal for notifying the

radio terminals

10A and 10B of setting information (PRACH configuration) related to the first radio resource (PRACH), and the present disclosure is not limited thereto. Absent. For example, the radio base station 20 may notify the setting information to the

radio terminals

10A and 10B using an RRC (Radio Resource Control) message.

The radio base station 20 executes, for example, an uplink scheduling process, and allocates an uplink radio resource (second radio resource) to the radio terminal 10A (S32). Note that before executing S32, the radio base station 20 may receive a scheduling request (SR) signal from the radio terminal 10A. In other words, the radio terminal 10A may transmit an SR signal requesting allocation of uplink radio resources to the radio base station 20 before S32 is executed.

The radio base station 20 is close in the frequency axis direction and / or the time axis direction to the extent that the second radio resource allocated to the radio terminal 10A can affect the first radio resource (PRACH) by inter-SCS interference. It may be determined whether or not it has sex (S33). The first radio resource is a radio resource having a first subcarrier interval, and the second radio resource is a radio resource having a second subcarrier interval different from the first subcarrier interval.

In S33, for example, when the second radio resource is arranged in the same subframe as the subframe in which the first radio resource (PRACH) is arranged, the radio base station 20 determines that the second radio resource is the first radio resource. It may be determined that the influence of inter-SCS interference may be exerted on the resource (PRACH).

When the radio base station 20 determines that the second radio resource can affect inter-SCS interference on the first radio resource (PRACH), the radio base station 20 relates to a buffer area arranged in a partial area of the second radio resource. The setting information (Buffer area configuration) is transmitted to the wireless terminal 10A by DCI, for example (S34). In other words, the radio base station 20 may store setting information (Buffer area configuration) related to the buffer area in a predetermined information field of DCI. The DCI may also store information (UL scheduling grant) related to the second radio resource allocated to the radio terminal 10A. Such DCI may be transmitted by PDCCH, for example, and may be transmitted by EPDCCH. The configuration information (Buffer area configuration) related to the buffer area according to the third embodiment is obtained when the radio terminal 10A as an uplink transmission apparatus receives the setting information from the radio base station 20 as an uplink reception apparatus. It is shared between the terminal 10A and the radio base station 20. In this case, the DCI format of S34 may be, for example, Format0_0 or Format0_1, and is detailed in TS38.212§7.3.1.1§DCI formats for scheduling of PUSCH. In other words, the DCI of S34 may have a configuration in which setting information indicating the buffer area according to the present embodiment is added to the DCI format detailed in TS38.212 §7.3.1.1.

The radio terminal 10A arranges the buffer area in the second radio resource to which the uplink data (UL data) is mapped according to the setting information (Buffer area configuration) related to the buffer area, and includes the buffer area and the uplink data (UL The second radio resource (PUSCH (with buffer area)) to which data is mapped is transmitted (S35). It is assumed that the first radio resource (PRACH) is reserved in the subframe having the second radio resource transmitted from the radio terminal 10A.

The other radio terminal 10B may transmit a signal having a predetermined signal sequence (Random Access Preamble) using the first radio resource according to the setting information (PRACH configuration) of S31 (S36). Note that the first radio resource transmitted in S36 and the second radio resource transmitted in S35 are included in the same subframe. Even in this case, the second radio resource is permitted to be transmitted from the radio terminal 10A of the second radio resource to which the uplink data (UL data) is mapped by the buffer area arranged in the second radio resource. The influence of inter-SCS interference from the resource to the first radio resource (PRACH) may be suppressed. Further, the buffer region arranged in the second radio resource can suppress the influence of inter-SCS interference from the first radio resource (PRACH) to the second radio resource.

The radio base station 20 performs uplink data (UL) from the second radio resource including the buffer area (PUSCH (with buffer area)) according to the setting information (Buffer area configuration) regarding the buffer area shared with the radio terminal 10A in S34. data). Further, the radio base station 20 can receive the first radio resource (PRACH) transmitted from the radio terminal 10B in S36.

The above is a specific application example of the first radio resource and the second radio resource in the third embodiment. Since the points omitted in the third embodiment are the same as those in the first embodiment, refer to the description of the first embodiment and the like as appropriate.

According to one aspect of the third embodiment disclosed above, when a radio frame structure including radio resources defined by a plurality of different subcarrier intervals (SCS) is used, the first radio resources having the first subcarrier interval are used. A buffer area is arranged in the second radio resource having a second subcarrier interval different from that of the first subcarrier. By arranging the buffer area in the second radio resource, it is possible to suppress the influence of inter-SCS interference between the second radio resource and the first radio resource. As a result, even when a radio frame structure including radio resources defined by a plurality of different subcarrier intervals (SCS) is used, radio communication can be performed appropriately. Such an operation is useful for realizing various wireless services such as eMBB, URLLC, and mMTC in the 5G system.

According to another aspect of the third embodiment disclosed above, the range of the buffer area is set by setting information dynamically shared between the transmission device and the reception device during operation of the wireless communication system. The Therefore, the arrangement of the buffer areas can be dynamically changed according to the setting information related to the buffer areas suitable for the situation during operation of the wireless communication system. As a result, even when a radio frame structure including radio resources defined by a plurality of different subcarrier intervals (SCS) is used, radio communication can be performed more appropriately. Such an operation is useful for realizing various wireless services such as eMBB, URLLC, and mMTC in the 5G system.

According to still another aspect of the third embodiment disclosed above, an uplink first radio resource (PRACH) used for processing related to an initial connection between a transmission device and a reception device of a wireless communication system. A buffer region is arranged in a partial region of the second radio resource (for example, PUSCH) that can affect the inter-SCS interference. The influence of inter-SCS interference from the second radio resource to the first radio resource (PRACH) can be suppressed by the buffer region arranged in the second radio resource. In addition, the buffer region arranged in the second radio resource can suppress the influence of inter-SCS interference from the first radio resource (PRACH) to the second radio resource. As a result, even when a radio frame structure including radio resources defined by a plurality of different subcarrier intervals (SCS) is used, radio communication can be performed appropriately. Such an operation is useful for realizing various wireless services such as eMBB, URLLC, and mMTC in the 5G system.

<Example 4> In Example 4, another specific application example is shown about a 1st radio | wireless resource and a 2nd radio | wireless resource. In the application example of the fourth embodiment, a plurality of first radio resources are arranged in one subframe. Such a first radio resource is, for example, PUSCH which is a kind of uplink radio resource. The second radio resource is PUSCH (Msg: 3) (which may also be referred to as Msg3 PUSCH) in a RACH (Random Access CHannel) sequence. In the case of uplink, the receiving device may correspond to the radio base station 20, and the transmitting device may correspond to the radio terminal 10.

FIG. 18 is a diagram illustrating an example of a buffer area arranged in a part of the radio resource in the frequency space-time structure of the subframe in the radio communication system according to the fourth embodiment. In the example of FIG. 18, PUSCH (D10) and PUSCH (D11) are arranged as the first radio resources of the first subcarrier interval (SCS # 1). In the example of FIG. 18, Msg3gPUSCH (D20) is arranged as the second radio resource at the second subcarrier interval (SCS # 2). In the example of FIG. 18, the slot (1 slot for SCS # 1) of the first subcarrier interval (SCS # 1) has a time axis that is longer than the slot (1 slot for SCS # 2) of the second subcarrier interval (SCS # 2). Half length in direction.

In FIG. 18, one second radio resource (D20) having a second subcarrier interval (SCS # 2) different from the first subcarrier interval (SCS # 1) of PUSCH (D10, D11), which is the first radio resource. A plurality of buffer areas (D201, D202) are arranged in the part. In this way, a plurality of buffer areas (D201, D202) are arranged in a partial area of the second radio resource (D20) that may affect the first radio resources (D10, D11) due to inter-SCS interference. Thus, uplink data transmission can be appropriately performed between the transmission device and the reception device in the wireless communication system.

The buffer area (D201) may be arranged in the second radio resource, for example, in an area close to the first radio resource (D10). The buffer area (D202) may be arranged in the second radio resource, for example, in an area close to the first radio resource (D11). The buffer region (D201) illustrated in FIG. 18 is arranged at a position adjacent to the first radio resource (D10) in the frequency axis direction. The buffer region (D202) illustrated in FIG. 18 is arranged at a position adjacent to the first radio resource (D11) in the frequency axis direction. Here, adjoining in the frequency axis direction does not necessarily mean that the arrangement of both in the frequency axis direction is continuous. For example, the first radio resource (D10) and the buffer area (D201) need only have proximity in the frequency axis direction to such an extent that the influence of inter-SCS interference can be suppressed. The same applies to the first radio resource (D11) and the buffer area (D202).

Further, the buffer area (D201) illustrated in FIG. 18 is arranged at a position overlapping with the first radio resource (D10) in the time axis direction. The buffer area (D202) illustrated in FIG. 18 is arranged at a position overlapping the first radio resource (D11) in the time axis direction. Here, overlapping in the time axis direction does not necessarily mean that both arrangements have the same time width in the time axis direction. For example, the first radio resource (D10) and the buffer area (D201) need only have redundancy in the time axis direction to such an extent that the influence of inter-SCS interference can be suppressed. In other words, the buffer area (D201) may be shorter or longer in the time axis direction than the first radio resource (D10). The same applies to the first radio resource (D11) and the buffer area (D202).

18, the position and size of the buffer region (D201) in the frequency axis direction are indicated by an offset (offset-1) in the frequency axis direction and a width (width-1). The offset (offset-1) in the frequency axis direction indicates the position of the buffer region (D201) from the reference point in the frequency axis direction in the frequency spatio-temporal structure of the subframe shown in FIG. In FIG. 18, the offset (offset-1) in the frequency axis direction may be a value indicating the relative position of the buffer region (D201) in the second radio resource (D20). In other words, the offset (offset-1) in the frequency axis direction may be a value indicating a relative position with the lower end of the second radio resource (D20) as the reference position (0). The width (width-1) indicates the size (width) of the buffer region (D201) in the frequency axis direction.

18, the position and size of the buffer region (D202) in the frequency axis direction are indicated by the offset (offset-2) in the frequency axis direction and the width (width-2). The offset (offset-2) in the frequency axis direction indicates the position of the buffer region (D202) from the reference point in the frequency axis direction in the frequency spatio-temporal structure of the subframe shown in FIG. In FIG. 18, the offset (offset-2) in the frequency axis direction may be a value indicating the relative position of the buffer region (D202). In other words, the offset (offset-2) in the frequency axis direction may be a value indicating a relative position with the lower end of the second radio resource (D20) as the reference position (0). The width (width-2) indicates the size (width) of the buffer region (D202) in the frequency axis direction.

18, the position and size of the buffer region (D201) in the time axis direction are indicated by the offset (offset-1) in the time axis direction and the width (width-1). The position and size of the buffer area (D201) in the time axis direction may be determined based on, for example, the arrangement of the first radio resource (D10). The arrangement of the first radio resource (D10) is changed according to the result of allocation scheduling of the first radio resource (D10) to uplink data (UL data) (which may also be referred to as the first uplink scheduling result). obtain. In other words, the position (offset-1) and width (width-1) of the buffer region (D201) in the time axis direction may be determined according to the first uplink scheduling result.

18, the position and size of the buffer region (D202) in the time axis direction are indicated by the offset (offset-2) and the width (width-2) in the time axis direction. The position and size of the buffer area (D202) in the time axis direction may be determined based on the arrangement of the first radio resource (D11), for example. The arrangement of the first radio resource (D11) is changed according to the result of allocation scheduling of the first radio resource (D11) for uplink data (UL data) (which may also be referred to as the second uplink scheduling result). obtain. In other words, the position (offset-2) and width (width-2) of the buffer region (D202) in the time axis direction may be determined according to the second uplink scheduling result.

As illustrated in FIG. 18, since the second radio resource according to the fourth embodiment has a plurality of buffer areas (D201, D202), the setting information regarding the buffer areas (D201, D202) is the buffer areas (D201, D202). ) Of buffer area information corresponding to the number of.

FIG. 19 is a diagram schematically illustrating an example of the configuration of the setting information related to the buffer area according to the fourth embodiment. The setting information (T10B) illustrated in FIG. 19 includes a plurality of buffer area information (T11B) indicating information related to the buffer areas (D201, D202), and the number of buffer area information indicating the number K of buffer area information (T11B) ( T12B). According to the example of FIG. 18 in which two buffer areas (D201, D202) for two first radio resources (D10, D11) are arranged, the setting information (T10B) is for the first radio resource (D10). Buffer area information (T11B) indicating the buffer area (D201) and buffer area information (T11B) indicating the buffer area (D202) for the first radio resource (D11). In this case, the buffer area information number K is, for example, “2”.

The buffer area information (T11B) in FIG. 19 specifies information (also referred to as frequency information) for specifying the buffer area (D201, D202) on the frequency axis, and specifies the buffer area (D201, D202) on the time axis. Information (which may also be referred to as time information). In the example of FIG. 19, the frequency information includes a buffer region frequency offset (T11B-1) and a buffer region frequency bandwidth (T11B-2). In the example of FIG. 19, the time information includes a buffer area time offset (T11B-3) and a buffer area time width (T11B-4). Since the characteristics of each information element in the buffer area information (T11B) are the same as those in FIG. 14, detailed description thereof is omitted.

FIG. 20 is a diagram illustrating an example of a wireless communication sequence in the wireless communication system 1 according to the fourth embodiment. The radio communication system 1 illustrated in FIG. 20 includes

radio terminals

10A and 10B as uplink transmission apparatuses and a radio base station 20 as an uplink reception apparatus. The radio terminal 10A, the radio terminal 10B, and the radio base station 20 may be communication devices that comply with, for example, a 5G system standard.

The sequence illustrated in FIG. 20 is an excerpt of a part of a series of processes related to uplink data transmission. In the illustration of FIG. 20, for example, the processing related to the connection establishment between the radio terminal 10 </ b> A and the radio base station 20 is not shown.

In FIG. 20, the radio terminal 10A may transmit an SR (UL Scheduling request) signal requesting allocation of uplink radio resources (S41). For example, in the case of an SPS (Semi-Persistence Scheduling) scheme in which uplink radio resources are allocated in a predetermined cycle, the radio terminal 10A may not execute transmission of an SR signal in S41.

The radio terminal 10B transmits a predetermined preamble signal (Random Access Preamble) (Msg: 1) to the radio base station 20 using the PRACH, which is an uplink common resource in the random access procedure. Note that the SR signal in S41 and the preamble signal in S42 may be transmitted in the same subframe or in different subframes. Further, the transmission timing of the SR signal in S41 may be before or after the transmission timing of the preamble signal in S42.

The radio base station 20 executes, for example, uplink scheduling processing and allocates uplink radio resources (first radio resource, second radio resource) to each radio terminal (10A, 10B) (S43). In S43, the radio base station 20 may allocate the first radio resource (for example, D10, D11; PUSCH in FIG. 18) to the radio terminal 10A that has transmitted the SR signal. In S43, the radio base station 20 can allocate a second radio resource (for example, D20; Msg3MPUSCH in FIG. 18) to the radio terminal 10B that has transmitted the preamble signal.

Based on the scheduling result of the uplink radio resource in S43, the radio base station 20 uses the second radio resource (Msg3 上り PUSCH) allocated to the radio terminal 10B as the first radio resource (PUSCH) allocated to the radio terminal 10A. It may be determined whether or not there is proximity in the frequency axis direction and / or the time axis direction to such an extent that inter-SCS interference can be affected (S44). The first radio resource (PUSCH) is a radio resource having a first subcarrier interval, and the second radio resource (Msg3 PUSCH) is a radio resource having a second subcarrier interval different from the first subcarrier interval. .

In S44, the radio base station 20 sets a range in which the second radio resource (Msg3 PUSCH) allocated to the radio terminal 10B overlaps with the first radio resource (PUSCH) allocated to the radio terminal 10A in the time axis direction. If so, it may be determined that the second radio resource can affect inter-SCS interference on the first radio resource.

Based on the scheduling result of the uplink radio resource in S43, the radio base station 20 transmits information (UL 第一 scheduling grant) related to the first radio resource allocated to the radio terminal 10A to the radio terminal 10A by DCI, for example. (S45). In other words, the radio base station 20 may store information on the first radio resource (UL scheduling) in a predetermined information field of DCI. Such DCI may be transmitted by PDCCH, for example, and may be transmitted by EPDCCH.

When the radio base station 20 determines that the second radio resource (Msg3 PUSCH) can affect inter-SCS interference on the first radio resource (PUSCH), a part of the second radio resource (Msg3 PUSCH) The setting information (Buffer area configuration) regarding the buffer area arranged in the area is transmitted to the wireless terminal 10B by DCI, for example (S46). In other words, the radio base station 20 may store setting information (Buffer area configuration) related to the buffer area in a predetermined information field of DCI. In the DCI of S46, information (UL scheduling grant (Msg: 2)) regarding the second radio resource (Msg3 PUSCH) allocated to the radio terminal 10B may be stored. Such DCI may be transmitted by PDCCH, for example, and may be transmitted by EPDCCH. In S46, the radio base station 20 transmits DCI including setting information (Buffer area configuration) related to the buffer area by PDCCH or EPDCCH, and information (UL scheduling grant (Msg: 2) about the second radio resource (Msg3 PUSCH) ) May be transmitted on the PDSCH. For example, the radio base station 20 may transmit a random access response (RA response) message storing information on the second radio resource (Msg3 PUSCH) (UL schedulingMgrant (Msg: 2)) using the PDSCH (S46). ).

The configuration information (Buffer area configuration) related to the buffer area according to the fourth embodiment is obtained when the radio terminal 10B as the uplink transmission device receives the setting information from the radio base station 20 as the uplink reception device. It is shared between the terminal 10B and the radio base station 20. In this case, the DCI format of S46 may be, for example, Format0_0 or Format0_1, and is detailed in TS38.211 §7.3.1.1 DCI formats for scheduling of PUSCH. In other words, the DCI in S46 may have a configuration in which setting information indicating the buffer area according to the present embodiment is added to the DCI format detailed in TS 38.211 §7.3.1.1.

In the example of FIG. 20, the DCI of S45 and the DCI of S46 may be transmitted in the same subframe or may be transmitted in different subframes.

The radio terminal 10A transmits the first radio resource (PUSCH) to which the uplink data (UL data) is mapped according to the information about the first radio resource (UL scheduling data) (S47).

The radio terminal 10B transmits an RRC connection request message (Msg: 3) in the random access procedure as uplink data (UL data) according to the information (UL scheduling grant (Msg: 2)) regarding the second radio resource ( S48). In S48, the radio terminal 10B arranges the buffer area in the second radio resource to which the RRC connection request message (Msg: 3) is mapped according to the setting information (Buffer area configuration) related to the buffer area, includes the buffer area, and RRC. Transmit the second radio resource (UL data (Msg: 3) (with Buffer area) [PUSCH]) (also called Msg3 PUSCH (with Buffer area)) to which the connection request message (Msg: 3) is mapped ( S48).

In the example of FIG. 20, the first radio resource (PUSCH) in S47 and the second radio resource (Msg3 PUSCH (with Buffer area)) in S48 may be transmitted in the same subframe, or different subframes. May be transmitted.

Even if the first radio resource (PUSCH) of S47 and the second radio resource (Msg3 PUSCH (with Buffer area)) of S48 are transmitted in the same subframe, they are arranged in the second radio resource. The buffer region can suppress the influence of inter-SCS interference from the second radio resource to the first radio resource. In addition, the buffer area arranged in the second radio resource can suppress the influence of inter-SCS interference from the first radio resource to the second radio resource.

The radio base station 20 transmits uplink data (Msg3 PUSCH (with Buffer area)) from the second radio resource (Msg3 PUSCH (with Buffer area)) according to the setting information (Buffer area configuration) related to the buffer area shared with the radio terminal 10B in S46. RRC connection request message as UL data) may be received. Also, the radio base station 20 can receive the first radio resource (PUSCH) transmitted from the radio terminal 10A in S47.

The above is a specific application example of the first radio resource and the second radio resource in the fourth embodiment. Since the points omitted in the fourth embodiment are the same as those in the first embodiment, refer to the description of the first embodiment as appropriate.

According to one aspect of the fourth embodiment disclosed above, when a radio frame structure including radio resources defined by a plurality of different subcarrier intervals (SCS) is used, the first radio resources having the first subcarrier interval are used. A buffer area is arranged in the second radio resource having a second subcarrier interval different from that of the first subcarrier. By arranging the buffer area in the second radio resource, it is possible to suppress the influence of inter-SCS interference between the second radio resource and the first radio resource. As a result, even when a radio frame structure including radio resources defined by a plurality of different subcarrier intervals (SCS) is used, radio communication can be performed appropriately. Such an operation is useful for realizing various wireless services such as eMBB, URLLC, and mMTC in the 5G system.

According to another aspect of the fourth embodiment disclosed above, the range of the buffer area is set by setting information dynamically shared between the transmission device and the reception device during operation of the wireless communication system. The Therefore, the arrangement of the buffer areas can be dynamically changed according to the setting information related to the buffer areas suitable for the situation during operation of the wireless communication system. As a result, even when a radio frame structure including radio resources defined by a plurality of different subcarrier intervals (SCS) is used, radio communication can be performed more appropriately. Such an operation is useful for realizing various wireless services such as eMBB, URLLC, and mMTC in the 5G system.

According to still another aspect of the fourth embodiment disclosed above, the RRC connection request message (Msg: 3) in the random access procedure between the transmission device and the reception device of the wireless communication system is mapped. When the second radio resource (Msg3gPUSCH) and the first radio resource (PUSCH) to which uplink data is mapped can be affected by inter-SCS interference, a part of the second radio resource (Msg3 PUSCH) The buffer area is arranged in the area. The buffer region arranged in the second radio resource (Msg3gPUSCH) can suppress the influence of inter-SCS interference from the second radio resource (Msg3 PUSCH) to the first radio resource (PUSCH). In addition, the buffer area arranged in the second radio resource (Msg3 PUSCH) can suppress the influence of inter-SCS interference from the first radio resource (PUSCH) to the second radio resource (Msg3 PUSCH). As a result, even when a radio frame structure including radio resources defined by a plurality of different subcarrier intervals (SCS) is used, radio communication can be performed appropriately. Such an operation is useful for realizing various wireless services such as eMBB, URLLC, and mMTC in the 5G system.

<Hardware configuration> Finally, the hardware configuration of the apparatus used in each of the embodiments disclosed above will be briefly described. FIG. 21 is a diagram illustrating an example of a hardware configuration of the radio terminal (UE) 10 and the radio base station (gNB) 20 in the radio communication system 1. The UE 10 is an example of an uplink transmission device and an example of a downlink reception device. The gNB 20 is an example of a reception device in the uplink and an example of a transmission device in the downlink.

21 includes a wireless communication circuit 101, a processing circuit 102, and a memory 103. Note that the UE 10 may include an antenna, a display device such as a liquid crystal display, an input device such as a touch panel, a battery such as a lithium-ion rechargeable battery.

The wireless communication circuit 101 receives a baseband signal (which may be referred to as a wireless signal or a digital wireless signal) from the processing circuit 102, and receives a wireless signal (second wireless signal, Configured to radiate the radio signal to space via an antenna. Thereby, UE10 can transmit a radio signal to gNB20. The wireless communication circuit 101 is configured to receive a wireless signal input from an antenna, convert the wireless signal into a baseband signal, and supply the baseband signal to the processing circuit 102. Thereby, UE10 can receive the radio signal from gNB20. As described above, the wireless communication circuit 101 is configured to be able to transmit and receive wireless signals and has a function of performing wireless communication with the gNB 20.

The wireless communication circuit 101 can be communicably connected to the processing circuit 102 via a transmission circuit mounted inside the UE 10. Examples of such a transmission circuit include a transmission circuit compliant with standards such as M-PHY and Dig-RF.

The processing circuit 102 (which may be referred to as a processor circuit or an arithmetic circuit) is a circuit configured to perform baseband signal processing. The processing circuit 102 is configured to generate a baseband signal (which may be referred to as a wireless signal or a digital wireless signal) based on a protocol stack in the wireless communication system 1 and output the baseband signal to the wireless communication circuit 101. . The processing circuit 102 is configured to perform reception processing such as demodulation and decoding on the baseband signal input from the wireless communication circuit 101 based on the protocol stack in the wireless communication system 1. In other words, in the uplink, the processing circuit 102 sequentially processes the first data addressed to the gNB 20 from the upper layer to the lower layer according to the protocol stack procedure in which the wireless communication function is divided into a plurality of layers. Based on the second data obtained in this way, the wireless communication circuit 101 has a side as a circuit that transmits a wireless signal. The processing circuit 102 is a circuit that sequentially processes a radio signal received via the radio communication circuit 101 from a lower layer to an upper layer according to a protocol stack procedure in which the radio communication function is divided into a plurality of layers. It has a side. Here, receiving a baseband signal input from the wireless communication circuit 101 has a side of receiving a wireless signal from the gNB 20 via the wireless communication circuit 101.

The processing circuit 102 may be an arithmetic device that realizes the operation of the UE 10 according to each of the above-described embodiments by reading and executing a program stored in the memory 103, for example. In other words, the processing circuit 102 executes the processing flow in the operation of the UE 10 according to each of the above-described embodiments (for example, the operations shown in FIGS. 6, 8, 9, 15, 17, and 20). It has a side as a subject. Examples of the processing circuit 102 include a CPU (Central Processing Unit), an MPU (Micro Processing Unit), a DSP (Digital Signal Processor), an FPGA (Field Programmable Gate Array), and combinations thereof. Note that the processing circuit 102 may be a multi-core processor including two or more cores. Further, the processing circuit 102 may include two or more processing circuits 102 according to each layer in the protocol stack of the wireless communication system 1.

The processing circuit 102 may be referred to as a C-CPU. In addition to the processing circuit 102, the UE 10 may include a processor circuit that may be referred to as an A-CPU that executes an application. The processing circuit 102 may be mounted on a single chip together with a processor circuit that may be referred to as an A-CPU, or may be mounted as an individual chip. As described above, the processing circuit 102 has a side surface as a control unit having a function of controlling the operation of the UE 10.

The memory 103 is a circuit configured to store and hold data and programs related to baseband signal processing executed by the processing circuit 102. The memory 103 includes at least one or both of a nonvolatile storage device and a volatile storage device. Examples include RAM (Random Access Memory), ROM (Read Only Memory), SSD (Solid State Drive), HDD (Hard Disk Drive), and the like. In FIG. 21, a memory 103 is a general term for various storage devices such as a main storage device and an auxiliary storage device. Similar to the processing circuit 102, the memory 103 may include two or more memories 103 according to each layer in the protocol stack of the wireless communication system 1.

21 includes a wireless communication circuit 201, a processing circuit 202, a memory 203, and a wired communication circuit 204.

The radio communication circuit 201 receives a baseband signal from the processing circuit 202 in the downlink, generates a radio signal having a predetermined output level from the baseband signal, and radiates the radio signal to space via the antenna. Composed. In addition, the radio communication circuit 201 is configured to receive a radio signal input from an antenna in the uplink, convert the radio signal into a baseband signal, and supply the baseband signal to the processing circuit 202. The wireless communication circuit 201 can be communicably connected to the processing circuit 202 via a transmission path such as CPRI (Common Public Radio Interface), and is also referred to as RRH (Remote Radio Head) or RRE (Remote Radio Equipment). Can be done. In addition, the combination of the wireless communication circuit 201 and the processing circuit 202 is not limited to one-to-one, and a plurality of processing circuits 202 are associated with one wireless communication circuit 201 or a plurality of wireless communication circuits 201 are combined. It is also possible to associate one processing circuit 202 or a plurality of wireless communication circuits 201 with a plurality of processing circuits 202. As described above, the wireless communication circuit 201 has a side surface as a communication unit (also referred to as a transmission / reception unit or a second transmission / reception unit) having a function of performing wireless communication with the UE 10.

The processing circuit 202 is a circuit configured to perform baseband signal processing. The processing circuit 202 is configured to generate a baseband signal based on a protocol stack in the wireless communication system and output the baseband signal to the wireless communication circuit 201 in the downlink. Further, the processing circuit 202 is configured to perform reception processing such as demodulation and decoding on the baseband signal input from the wireless communication circuit 201 on the uplink based on a protocol stack in the wireless communication system. In other words, in the downlink, the processing circuit 202 sequentially processes transmission data addressed to the UE 10 as the receiving apparatus from the upper layer to the lower layer according to the protocol stack procedure in which the wireless communication function is divided into a plurality of layers. Thus, it has a side as a circuit for transmitting via the wireless communication circuit 201. In the uplink, the processing circuit 202 sequentially processes a radio signal received via the radio communication circuit 201 from a lower layer to an upper layer according to a protocol stack procedure in which the radio communication function is divided into a plurality of layers. And has a side surface as a circuit. Here, receiving an input of a baseband signal from the radio communication circuit 201 in the uplink has a side of receiving a radio signal from the UE 10 via the radio communication circuit 201.

The processing circuit 202 reads and executes a program stored in the memory 203, for example, to thereby operate the gNB 20 according to the above-described embodiments (for example, FIG. 6, FIG. 8, FIG. 9, FIG. 15, FIG. 17). The operation device that realizes the operation shown in FIG. Examples of the processing circuit 202 include a CPU (Central Processing Unit), an MPU (Micro Processing Unit), a DSP (Digital Signal Processor), and an FPGA (Field Programmable Gate Array). Note that the processing circuit 202 may be a multi-core processor including two or more cores. Further, the processing circuit 202 may include two or more processing circuits 202 according to each layer in the protocol stack of the wireless communication system. For example, a processing circuit 202 that executes processing as a MAC entity belonging to the MAC layer, a processing circuit 202 that executes processing as an RLC entity belonging to the RLC layer, and a processing circuit that executes processing as a PDCP entity belonging to the PDCP layer 202 may be individually implemented. As described above, the processing circuit 202 has a side surface as a control unit having a function of controlling the operation of the radio base station 20 (which may be referred to as a second control unit in order to be distinguished from the control unit of the UE 10). . For example, the processing circuit 202 executes a process of transmitting various setting information (for example, first setting information and second setting information) to the UE 10. Note that various types of setting information may be referred to as control signals.

The memory 203 is a circuit configured to store and hold data and programs related to baseband signal processing executed by the processing circuit 202. The memory 203 includes at least a nonvolatile storage device and / or a volatile storage device. Examples include RAM (Random Access Memory), ROM (Read Only Memory), SSD (Solid State Drive), HDD (Hard Disk Drive), and the like. In FIG. 21, a memory 203 is a general term for various storage devices such as a main storage device and an auxiliary storage device. Similar to the processing circuit 202, the memory 203 may include two or more memories 203 depending on each layer in the protocol stack of the wireless communication system. For example, a memory 203 used for processing as a MAC entity belonging to the MAC layer, a memory 203 used for processing as an RLC entity belonging to the RLC layer, and a memory 203 used for processing as a PDCP entity belonging to the PDCP layer May be implemented individually.

The wired communication circuit 204 converts the packet data into a format that can be output to another device and transmits the packet data to another device, or extracts data from the packet data received from the other device, and the memory 203 or processing circuit Or output to 202 or the like. Examples of other devices include other radio base stations, MME (Mobility Management Entity), SGW (Serving Gateway), and the like. The MME and SGW are also called core nodes, and the logical communication interface used for communication with the core nodes can also be called S1 interfaces. A logical communication interface used for communication with other radio base stations may also be referred to as an X2 interface.

The features and advantages of the present disclosure will become apparent from the above detailed description. This is intended to cover the above features and advantages of the present disclosure without departing from the spirit and scope of the claims. Any person having ordinary knowledge in the technical field should be able to easily come up with any improvements and changes. Accordingly, there is no intention to limit the scope of the disclosure having inventive features to those described above, and appropriate improvements and equivalents included in the scope disclosed in the present specification can also be used. For example, the steps disclosed in this specification do not necessarily have to be processed in chronological order in the order described as an example of the processing flow, and are within the scope of the gist of the present invention described in the claims. , The order of the steps may be changed, or a plurality of steps may be executed in parallel. The situation that can occur in the 5G system, which is clarified in the above detailed description, can be found when the 5G system is examined from one side. When the other side is examined, there are other situations. Note that it can be found. In other words, the features and advantages of the present invention are not limited to applications that solve the circumstances specified in the above detailed description.

Finally, the configuration of each embodiment and modification in the present disclosure is an example for embodying the technical idea of the present invention, and the present invention is limited to the configuration of each embodiment and modification. And is equally applicable to other embodiments within the scope of the claims. For example, it should be noted that the terms in this disclosure may be renamed in future 5G system specifications. It should also be noted that one or more alternative names listed for a term in the present disclosure may be synonymous with each other.

1 wireless communication system 10 wireless terminal (UE)
101 wireless communication circuit 102 processing circuit 103 memory 20 wireless base station (gNB)
201 wireless communication circuit 202 processing circuit 203 memory 204 wired communication circuit

Claims

A transmitter capable of wireless communication with one or more receivers by a plurality of subcarriers having at least one subcarrier interval,
Among the radio resources in which the plurality of subcarriers are partitioned by the time axis direction and the frequency axis direction, the first radio resources having subcarriers at the first subcarrier interval are second radio resources that are different in the frequency axis direction. The second radio resource having a subcarrier having a second subcarrier interval different from the first subcarrier interval is at least one of the subcarriers having the second subcarrier interval that the second radio resource has. Sharing setting information indicating a buffer area arranged in a subcarrier of a part with at least one of the one or more receiving devices;
For the second radio resource, transmission data is allocated according to the setting information and transmitted by radio.
A transmission apparatus characterized by the above.
The transmission device according to claim 1,
The first radio resource and the second radio resource do not overlap in the frequency axis direction and are close in the frequency axis direction,
The setting information indicates a position of the buffer area arranged in a part of the second radio resource overlapping with the first radio resource in the time axis direction.
A transmission apparatus characterized by the above.
The transmission device according to claim 1 or 2,
The setting information is shared between the transmitting device and the receiving device by downlink control information (DCI).
A transmission apparatus characterized by the above.
The transmission device according to any one of claims 1 to 3,
The setting information indicates a position of the buffer area by a resource element unit or a resource block unit composed of a plurality of resource elements.
A transmission apparatus characterized by the above.
The transmission device according to any one of claims 1 to 4, comprising:
The transmitter is a radio base station;
The receiving device is a wireless terminal;
The first radio resource is an SS / PBCH (Synchronization Signal / Physical Broad CHannel) block,
The second radio resource is PDSCH (Physical Downlink Shared CHannel),
A transmission apparatus characterized by the above.
The transmission device according to any one of claims 1 to 4, comprising:
The transmitting device is a wireless terminal;
The receiving device is a radio base station;
The first radio resource is PRACH (Physical Random Access CHannel) or Msg3 PUSCH (Message3 Physical Uplink Shared CHannel),
The second radio resource is a PUSCH (Physical Uplink Shared CHannel) other than the Msg3 PUSCH.
A transmission apparatus characterized by the above.
A receiving device capable of wireless communication with a transmitting device by a plurality of subcarriers having at least one subcarrier interval,
Among the radio resources in which the plurality of subcarriers are partitioned by the time axis direction and the frequency axis direction, the first radio resources having subcarriers at the first subcarrier interval are second radio resources that are different in the frequency axis direction. The second radio resource having a subcarrier having a second subcarrier interval different from the first subcarrier interval is at least one of the subcarriers having the second subcarrier interval that the second radio resource has. Sharing setting information indicating a buffer area arranged in a subcarrier of a part with the transmission device,
When decoding data from the second radio resource transmitted from the transmission device, excluding a part of the second radio resource corresponding to the buffer area indicated in the setting information from decoding targets,
A receiving apparatus.
The receiving device according to claim 7, comprising:
The first radio resource and the second radio resource do not overlap in the frequency axis direction and are close in the frequency axis direction,
The setting information indicates a position of the buffer area arranged in a part of the second radio resource overlapping with the first radio resource in the time axis direction.
A receiving apparatus.
The receiving device according to claim 7 or 8, comprising:
The setting information is shared between the transmitting device and the receiving device by downlink control information (DCI).
A receiving apparatus.
A receiving device according to any one of claims 7 to 9,
The setting information indicates a position of the buffer area by a resource element unit or a resource block unit composed of a plurality of resource elements.
A receiving apparatus.
A receiving device according to any one of claims 7 to 10,
The transmitter is a radio base station;
The receiving device is a wireless terminal;
The first radio resource is an SS / PBCH (Synchronization Signal / Physical Broad CHannel) block,
The second radio resource is PDSCH (Physical Downlink Shared CHannel),
A receiving apparatus.
A receiving device according to any one of claims 7 to 10,
The transmitting device is a wireless terminal;
The receiving device is a radio base station;
The first radio resource is PRACH (Physical Random Access CHannel) or Msg3 PUSCH (Message3 Physical Uplink Shared CHannel),
The second radio resource is a PUSCH (Physical Uplink Shared CHannel) other than the Msg3 PUSCH.
A receiving apparatus.
A wireless communication method executed in a transmission device capable of wireless communication with one or more receiving devices by a plurality of subcarriers having at least one subcarrier interval,
Among the radio resources in which the plurality of subcarriers are partitioned by the time axis direction and the frequency axis direction, the first radio resources having subcarriers at the first subcarrier interval are second radio resources that are different in the frequency axis direction. The second radio resource having a subcarrier having a second subcarrier interval different from the first subcarrier interval is at least one of the subcarriers having the second subcarrier interval that the second radio resource has. Sharing setting information indicating a buffer area arranged in a subcarrier of a part with at least one of the one or more receiving devices;
For the second radio resource, transmission data is allocated according to the setting information and transmitted by radio.
A wireless communication method.
A wireless communication method executed in a receiving device capable of wireless communication with a transmitting device using a plurality of subcarriers having at least one subcarrier interval,
Among the radio resources in which the plurality of subcarriers are partitioned by the time axis direction and the frequency axis direction, the first radio resources having subcarriers at the first subcarrier interval are second radio resources that are different in the frequency axis direction. The second radio resource having a subcarrier having a second subcarrier interval different from the first subcarrier interval is at least one of the subcarriers having the second subcarrier interval that the second radio resource has. Sharing setting information indicating a buffer area arranged in a subcarrier of a part with the transmission device,
When decoding data from the second radio resource transmitted from the transmission device, excluding a part of the second radio resource corresponding to the buffer area indicated in the setting information from decoding targets,
A wireless communication method.
A wireless communication system comprising one or more receiving devices and a transmitting device capable of wireless communication with the one or more receiving devices by a plurality of subcarriers having at least one or more subcarrier intervals,
The transmitter is
Among the radio resources in which the plurality of subcarriers are partitioned by the time axis direction and the frequency axis direction, the first radio resources having subcarriers at the first subcarrier interval are second radio resources that are different in the frequency axis direction. The second radio resource having a subcarrier having a second subcarrier interval different from the first subcarrier interval is at least one of the subcarriers having the second subcarrier interval that the second radio resource has. Sharing setting information indicating a buffer area arranged in a subcarrier of a part with at least one of the one or more receiving devices;
For the second radio resource, transmission data is allocated according to the setting information and transmitted by radio,
The receiving device is:
When decoding data from the second radio resource transmitted from the transmission device, excluding a part of the second radio resource corresponding to the buffer area indicated in the setting information from decoding targets,
A wireless communication system.