JP6976920B2 - Wireless communication equipment, wireless communication systems, wireless communication methods and programs - Google Patents

Description

The present invention relates to a wireless communication device, a wireless communication method and a program for mobile communication.

Conventionally, a mobile communication system using adaptive modulation coding control (AMC) based on response (ACK / NACK) feedback regarding data transmission success or failure and hybrid ARQ (HARQ) retransmission is known in a mobile communication system (for example, Non-Patent Document 1). reference). This technology allows a certain initial transmission block error in order to improve frequency utilization efficiency by transmitting data with as high a number of modulation values as possible and as high a coding rate as possible, and allows an initial transmission block error based on ACK / NACK feedback. The combination of data modulation method and error correction coding rate (MCS: Modulation and Coding rate) is controlled so that the rate becomes the target value, and ACK is used for data blocks in which transmission errors are detected (that is, NACK is fed back). By performing feedback or HARQ retransmission until the maximum number of retransmissions specified in advance is reached, transmission errors are reduced and transmission reliability in the radio section is improved. According to this technology, it is possible to achieve both improvement in frequency utilization efficiency and high reliability in wireless transmission. AMC based on ACK / NACK feedback may be referred to as Outer-Loop Link Adaptation (OLLA).

F. Blancuez-Casado et al, "eOLLA: an enhanced outer loop link adaptation for cellular networks," EURASIP Journal on Wireless Communications and Communication16. 2016. DOI: 10.1186 / s13638-016-0518-3.

However, in the above-mentioned conventional technique, the transmission delay dispersion in the radio section increases due to the increase in transmission delay due to retransmission in order to increase the data transmission reliability. There is a problem that it will be difficult to realize.

In addition, in the 5th generation (5G) mobile communication system of 3GPP (3rd Generation Partnership Project), URLLC (Ultra Reliable & Low Latency Communication) assuming automatic driving, telemedicine, etc. is considered as one of its use cases. ing. In this URLLC communication, there is a demand for a wireless transmission technology that achieves both low delay and high reliability.

The mobile communication wireless communication device according to one aspect of the present invention has the low delay transmission data required for low delay communication in the data channel region of the subframe constituting the wireless frame when the transmission target includes the low delay transmission data. Under the condition that the resource allocation amount in the time direction of the delayed transmission data is minimized in units of resource elements, the low delay transmission data covers a part or the whole of the system band in the frequency direction depending on the size of the low delay transmission data. A resource allocation unit for allocating the resources of the above, and a transmission unit for transmitting the low-delay transmission data in the resource allocation area allocated by the resource allocation unit. The transmission unit may transmit control information including information defining a resource allocation area for the low-delay transmission data in the control channel area of the subframe.
In the wireless communication device, the resource allocation unit may allocate the resource of the low delay transmission data to the head portion in the time direction in the data channel region.
The resource allocation unit may allocate resources for the low-delay transmission data by distributing them to a plurality of locations in the data channel region in the frequency direction.
The resource allocation unit may allocate resources for the low-delay transmission data by distributing them to both ends in the frequency direction in the data channel region.

In the wireless communication device, the transmission power of the resource allocation area of the low delay transmission data is set to be low under the condition that the average transmission power of the entire system band is maintained at a predetermined power in the frequency direction of the data channel region. A transmission power control unit that controls transmission power so as to be higher than other resource areas other than the resource allocation area of delayed transmission data may be provided.
When TDD (Time Division Duplex) is used as the duplex system in the wireless communication device, the resource allocation unit is used for retransmission control of the low-delay transmission data from the destination to the low-delay transmission data in the data channel area. You may allocate a resource area to receive the response. Under the condition that the average transmission power of the entire system band is maintained at a predetermined power in the frequency direction of the data channel region, the transmission power of the resource allocation region of the retransmission control response is the resource allocation of the retransmission control response. It may be higher than other resource areas other than the area.
In the wireless communication device, the transmission unit may transmit a reference signal for demodulating the low-delay transmission data together with the low-delay transmission data in the resource allocation area of the low-delay transmission data.
In the wireless communication device, the low-delay transmission data may be data for URLLC (Ultra-Reliable and Low Latency Communications).

The wireless communication system according to still another aspect of the present invention is a receiving side radio communication device for transmitting the low delay transmission data and receiving the low delay transmission data transmitted from the transmission side wireless communication device. It is equipped with a wireless communication device on the side.
In the wireless communication system, the receiving side wireless communication device receives the radio signals of the low-delay transmission data at different positions or receives radio signals of different polarizations of the low-delay transmission data. The receiving antenna diversity may be executed by having a plurality of antennas provided in the above and selecting or synthesizing the received signals received by each antenna.
In the wireless communication system, the transmitting side wireless communication device so as to transmit the wireless signal of the low-delay transmission data at different positions or to transmit the wireless signal of different polarizations of the low-delay transmission data. It may have a plurality of antennas provided in the above and execute a transmission antenna diversity scheme for selecting or synthesizing a transmission signal to be transmitted by each antenna.
In the wireless communication system, the transmitting side wireless communication device may execute the transmitting antenna diversity by performing spatiotemporal coding or spatial frequency coding on the low delay transmission data.
In the wireless communication system, the transmitting antenna diversity may be a circulation delay diversity.

In the wireless communication method according to still another aspect of the present invention, when low-delay transmission data that requires low-delay communication is included in the transmission target, the low-delay in the data channel region of the subframe constituting the wireless frame. Under the condition that the resource allocation amount in the time direction of the transmission data is minimized in units of resource elements, the low-delay transmission data may be partially or wholly covered in the system band in the frequency direction depending on the size of the low-delay transmission data. It includes allocating a resource and transmitting the low-delay transmission data in the resource allocation area of the low-delay transmission data.
The program according to still another aspect of the present invention is a program executed by a computer or a processor provided in a wireless communication device for mobile communication, and includes low-delay transmission data that requires low-delay communication as a transmission target. When, in the data channel area of the subframe constituting the wireless frame, depending on the size of the low-delay transmission data under the condition that the resource allocation amount in the time direction of the low-delay transmission data is minimized in units of resource elements. A program code for allocating the resource of the low-delay transmission data to a part or the whole of the system band in the frequency direction, and a program code for transmitting the low-delay transmission data in the resource allocation area of the low-delay transmission data. , Have.

According to the present invention, it is possible to improve the frequency utilization efficiency and the transmission reliability while reducing the delay in the transmission of low-delay transmission data.

Explanatory drawing which shows an example of the schematic structure of the wireless communication system which concerns on this embodiment. (A) and (b) are explanatory diagrams showing the resource allocation of the subframe which concerns on a reference example. (A) is an explanatory diagram showing an example of resource allocation of a subframe in the wireless communication system according to the present embodiment. (B) is a graph showing an example of transmission power distribution in the frequency axis direction at the time of URLLC data transmission in the same subframe. (A) is an explanatory diagram showing another example of resource allocation of a subframe in the wireless communication system according to the present embodiment. (B) is a graph showing an example of transmission power distribution in the frequency axis direction at the time of URLLC data transmission in the same subframe. An explanatory diagram showing still another example of resource allocation of subframes in the wireless communication system according to the present embodiment. An explanatory diagram showing still another example of resource allocation of subframes in the wireless communication system according to the present embodiment. (A) is an explanatory diagram showing still another example of resource allocation of subframes in the wireless communication system according to the present embodiment. (B) is a graph showing an example of transmission power distribution in the frequency axis direction at the time of URLLC data transmission in the same subframe. An explanatory diagram showing still another example of resource allocation of subframes in the wireless communication system according to the present embodiment. The functional block diagram which shows an example of the base station on the transmitting side in the wireless communication system which concerns on this embodiment. The sequence diagram which shows an example of transmission / reception of transmission data including downlink URLLC data which concerns on this embodiment. The sequence diagram which shows the other example of transmission / reception of transmission data including downlink URLLC data which concerns on this embodiment. FIG. 3 is a sequence diagram showing still another example of transmission / reception of transmission data including downlink URLLC data according to the present embodiment. (A), (b) and (c) are explanatory views which show an example of the antenna diversity applicable to the wireless communication system which concerns on this embodiment, respectively.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an explanatory diagram showing an example of a schematic configuration of a wireless communication system according to the present embodiment.
In FIG. 1, the wireless communication system 10 is a base station 20 as a wireless communication device that functions as a transmitter and a receiver of wireless communication, and a mobile station as a wireless communication device that functions as a transmitter and a receiver of wireless communication. 30 and. The number of base stations 20 and mobile stations 30 may be plural.

The base station 20 is connected to the mobile communication core network 80. For example, the base station 20 functions as a transmitter and the mobile station 30 functions as a receiver to move data from the core network 80 or another mobile station or data generated by the base station 20 from the base station 20. Downlink (DL) wireless communication to be transmitted to the station 30 can be performed. Further, the base station 20 functions as a receiver and the mobile station 30 functions as a transmitter, so that the uplink (UL) wireless communication for transmitting the data generated by the mobile station 30 to the base station 20 can be performed. can. The data received by the base station 20 is transmitted to the core network 80 or another mobile station, or processed in the base station 20.

In DL data transmission, ACK / NACK feedback for HARQ retransmission is performed through UL. On the other hand, in UL data transmission, ACK / NACK feedback for HARQ retransmission is performed through DL.

The wireless communication system 10 of the present embodiment may use a communication method compliant with the 4th generation (4G), LTE (Long Term Evolution), LTE-Advanced or LTE-AdvancedPro communication standard of 3GPP, or a fifth. A communication method conforming to the communication standard of the generation (5G) or the next generation may be used.

The wireless communication system 10 of the present embodiment is being studied as a 5G use case, such as high-speed and large-capacity eMBB (enhanced Mobile Broadband), ultra-reliable and low-latency URLLC (Ultra-Reliable and Low Latency Communications), and multiple terminals. It can be applied to data communication such as mMTC (massive Machine Type Communications) which is a simultaneous connection. In particular, the wireless communication system 10 of the present embodiment has low eMBB data (hereinafter referred to as "eMBB data") and URLLC data (hereinafter referred to as "URLLC data") assuming automatic driving, telemedicine, and the like. Suitable for wireless communication to send and receive delayed transmission data. Here, low-delay transmission data such as URLLC data is required to have a one-way delay time of several ms or less (for example, 1 ms or less) in a wireless section of a mobile communication network, and is end-to-to-end via a mobile communication network. This is data that requires an end delay time of 10 ms or less.

The base station 20 forms one or more cells (also referred to as sectors or sector cells). The cell may be formed two-dimensionally on the ground or the sea, or may be formed three-dimensionally from the sky toward the ground or the sea. The cell may be a macro cell, a small cell, a femto cell, a pico cell, a large cell, or the like. The plurality of cells may form a cellular structure that is distributed so as to be two-dimensionally or three-dimensionally adjacent to each other, or may form a hierarchical cell structure in which some or all of them are hierarchically overlapped. .. The base station 20 is a macrocell base station, a small cell base station, a femtocell base station, a picocell base station, a large cell base station, a fixed base station fixedly installed on the ground, etc. It may be a type base station or the like. The base station 20 may be a wireless communication device called an eNodeB (evolved Node B: eNB), gNodeB (gNB), en-NodeB (en-gNB), access point, or the like.

The mobile station 30 may be a wireless communication device called a user device (UE), a user terminal, a terminal, a terminal device, a mobile device, or the like. The mobile station 30 can be installed by incorporating it into a device that can be used while being carried by a user, a device that can be used in a mobile body (for example, a car, a train, a flying body, a ship), a mobile body, or another device. It may be a device or the like. The mobile station 30 may perform communication in a state of being mobile, or may perform communication in a state of being fixedly arranged.

In the wireless communication system of the present embodiment, various multiple access technologies can be used. Multiple access technologies include frequency division multiple access (FDMA), time division multiple access (TDMA), or time division multiple access (TDMA), which assign different frequencies or times or spread codes to multiple mobile stations. , Code Division Multiple Access (CDMA) may be used. The multiple access technique may be a spatial division multiple access method (SDMA) in which different base station antenna directivities are assigned to each of the plurality of mobile stations.

The multiple access technology is a multiple access technology based on Orthogonal Frequency Division Multiplexing (OFDM), which is classified as one of the FDMA technologies, that is, the Orthogonal Frequency Division Multiple Access (OFDMA). It may be a method called.

Since each of the FDMA, TDMA, CDMA, and SDMA multiple access methods allocates radio resources that are orthogonal or quasi-orthogonal to each mobile station, such as frequencies, times, diffusion codes, and base station antenna directivity, which are different from each other, these Multiple access methods are broadly categorized as orthogonal multiple access (OMA) technologies.

In the wireless system of the present embodiment, a single orthogonal multiple access (OMA) technology may be used, or a hybrid type in which two or three methods of each OMA technology such as FDMA, TDMA, CDMA, and SDMA are used in combination. , For example, a combination of FDMA and TDMA, a combination of FDMA, TDMA and SDMA, and a plurality of OMA techniques may be used in combination.

The wireless system of the present embodiment is ultra-high using a MU-MIMO transmission method that multiplexes communication of a plurality of mobile stations at the same frequency and at the same timing based on the principle of SDMA classified into orthogonal multiple access (OMA technology). It may be a density multiple access type wireless communication system. Non-orthogonal multiple access (NoMA) technology that allows mutual interference of some or all of the radio resources assigned to each mobile station may be applied to the ultra-high density multiple access radio communication system.

In the wireless system of the present embodiment, different multiple connection methods may be used for downlink communication and uplink communication. For example, OFDMA may be used for downlink communication, and FDMA (Single Carrier-FDMA) may be used for uplink communication.

In the wireless section between the base station 20 and the mobile station 30, wireless communication is performed using one or a plurality of wireless frames. The wireless frame has, for example, a system band having a predetermined frequency width (for example, 20 MHz) set in a predetermined frequency band in the frequency axis direction (for example, several hundred MHz, several GHz, several tens GHz, etc.) and has a time. Axial predetermined time intervals (eg, 10 ms). The system band is set according to the frequency band used, and may be 40 MHz, 80 MHz, 160 MHz, or 400 MHz in addition to 20 MHz.

A radio frame is composed of one or a plurality of subframes having a predetermined transmission time interval (TTI), which is the minimum unit of scheduling in the time axis direction. For example, if the TTI is 1 ms, the radio frame is composed of 10 subframes. The TTI may be 0.5 ms, 0.25 ms or 0.125 ms in addition to 1 ms. By shortening the TTI and shortening the radio frame length, it is possible to reduce the transmission delay in the radio section.

The radio frame is composed of one or a plurality of subcarriers having a predetermined subcarrier spacing (for example, 15 kHz) in the frequency axis direction. The subcarrier interval is set according to the frequency band, system band, and the like, and may be 30 kHz, 60 kHz, or 120 kHz in addition to 15 kHz. The subframe may be composed of, for example, one or more slots in the time axis direction, and one slot may be composed of one or more (for example, 6 or 7) symbols.

In the wireless communication system of the present embodiment, scheduling is performed to allocate wireless resources such as the above-mentioned TTI, system band, and transmission power that can be used for wireless communication of various data and signals between the base station 20 and the mobile station 30. Scheduling is performed, for example, at the base station 20. Allocation in each direction of the frequency axis and the time axis of the radio resource is performed with one or a plurality of resource elements (RE) as the minimum unit. The resource element (RE) is composed of, for example, one subcarrier and one symbol. When the minimum unit of resource allocation is composed of a plurality of resource elements (RE), the block in which the minimum unit of resource allocation is composed of a plurality of resource elements may be called a resource block (RB). The symbol is one unit of modulation of the time axis in the above-mentioned various communication methods. For example, a symbol in OFDM is called an OFDM symbol.

The configuration of the wireless frame in the present embodiment is an example, and the number of subframes included in the wireless frame, the number of slots, subcarriers and symbols included in the subframe, and the resource elements (subs) included in the resource block. The number of carriers (carriers, symbols) can be changed in various ways.

The wireless communication system of the present embodiment performs downlink (DL) wireless communication from the base station 20 to the mobile station 30 as follows. For example, downlink control information (DCI) is transmitted from the base station 20 to the mobile station 30 using a downlink control channel region arranged in a predetermined region of a subframe. The downlink control channel is also called, for example, PDCCH (Physical Downlink Control Channel) or ePDCCH (enhanced Physical Downlink Control Channel) in LTE, LTE-Advanced, and 5G. , ACK / NACK feedback related to uplink HARQ retransmission control, transmission power control to each mobile station, etc. The downlink data is transmitted from the base station 20 to the mobile station 30 using the downlink data channel area arranged in a predetermined area of the subframe. The downlink data channel is also called, for example, PDSCH (Physical Downlink Shared Channel). The downlink signal includes a reference signal (RS) for estimating the propagation path for demodulating data from the received signal, symbol timing synchronization, receiving quality measurement, and the like. The data demodulation reference signal includes DMRS (Demodulation Reference Signal) and CRS (Cell-specific Reference Signal), and the quality measurement reference signal includes CSI-RS (Channel State Information Reference Signal).

The wireless communication system of the present embodiment performs uplink (UL) wireless communication from the mobile station 30 to the base station 20 as follows, for example. For example, uplink data is transmitted from the mobile station 30 to the base station 20 using an uplink data channel area arranged in a predetermined area of the subframe. The uplink data channel is also called, for example, LTE, LTE-Advanced, and PUSCH (Physical Uplink Shared Channel) in 5G. The uplink signal includes a reference signal (RS) for propagating path estimation for demodulating data from the received signal, symbol timing synchronization, reception quality measurement, and the like. The data demodulation reference signal includes DMRS (Demodulation Reference Signal), and the quality measurement reference signal includes SRS (Sounding Reference Signal). PUCCH (Physical Uplink Control Channel), which corresponds to the uplink control channel, is used for feedback such as quality measurement results using CRS and CSI-RS on the downlink, and ACK / NACK feedback related to HARQ retransmission control on the downlink. Used.

For example, in the case of LTE or LTE-Advanced, the control channel area is set to the first area in the time axis direction of the subframe (for example, one symbol or two symbols), and the data channel area follows the control channel area. It is set in the remaining area that follows.

Further, in the wireless communication system of the present embodiment, adaptive modulation and coding (AMC: Adaptive Modulation and Coding) that selects a modulation coding method based on the hybrid ARQ (HARQ) retransmission control and the response (ACK / NACK) of the HARQ is used. ) Controlling. In this HARQ control and AMC control, a certain transmission error and a plurality of retransmissions are allowed, and the modulation level and the coding rate in the wireless transmission are controlled based on the ACK / NACK feedback result from the receiving side, thereby performing the wireless transmission. We are trying to improve the reliability of the.

Next, allocation of radio resources used for wireless communication of low-delay transmission data in the wireless communication system of the present embodiment will be described. In the present embodiment, there is a case where URLLC data, which is low-delay transmission data, and eMBB data (hereinafter referred to as “eMBB data”), which is other data, are DL-communicated from the base station 20 to the mobile station 30 in one subframe. Illustrate.

2A and 2B are explanatory diagrams showing resource allocation of the subframe 400 according to the reference example. FIG. 2A shows resource allocation when there is no URLLC traffic, and FIG. 2B shows resource allocation when there is URLLC traffic. The first area of the subframe 400 in the time axis direction is the control channel area 410 to which DL control information can be assigned, and the remaining area after that is the data channel area to which transmission data (URLLC data, eMBB data) can be assigned. It is 420.

When there is no URLLC traffic shown in FIG. 2A, the eMBB data resource is allocated to the entire data channel area 420 of the subframe 400, and the high-speed and large-capacity data is surely transferred from the base station 20 to the mobile station 30. It is possible to send.

When there is the URLLC traffic of the user # 1 shown in FIG. 2 (b), the URLLC of the user # 1 is set so that the resource allocation bandwidth is minimized for some subcarriers of the data channel area 420 of the subframe 400. Data resources (hereinafter also referred to as “URLLC resources”) 422 are preferentially allocated in the time axis direction, and user # 2 eMBB data resources (hereinafter “eMBB resources”) are allocated to the remaining portion of the data channel area 420. 421) is assigned.

In this reference example, the allocation of the URLLC resource 422 is the allocation of a narrow band frequency range, and it is difficult to obtain the frequency diversity effect during wireless transmission of URLLC data. Therefore, not only the reliability of wireless transmission of URLLC data is lowered, but also retransmission is likely to occur, so that the transmission delay dispersion associated with retransmission is increased and low-delay wireless transmission is difficult.

Therefore, in the present embodiment, when there is URLLC traffic, the resource allocation of the URLLC data is not minimized but the allocation in the time axis direction is minimized according to the size, instead of minimizing the resource allocation bandwidth in the subframe 400. It is carried out.

In the following embodiment, among the plurality of types of transmission data transmitted from the base station 20 in the data channel area of the subframe, the first data (normally delayed transmission data) is the eMBB data, which is higher than the first data. The case where the second data (low-delay transmission data) that requires low-delay wireless transmission is URLLC data will be described, but it may be a combination of other data. Further, in the present embodiment, downlink wireless transmission from the base station 20 to the mobile station 30 will be described, but resource allocation and transmission power control of subframes in the present embodiment are performed from the mobile station 30 to the base station 20. The same can be applied to the wireless transmission of the uplink of.

(Example 1)
FIG. 3A is an explanatory diagram showing an example of resource allocation of the subframe 400 in the wireless communication system according to the present embodiment, and FIG. 3B is a frequency axis direction at the time of transmitting URLLC data in the subframe 400. It is a graph which shows an example of the transmission power distribution of.

As shown in FIG. 3A, in the data channel area 420 of the subframe 400, under the condition that the resource allocation amount in the time direction of the URLLC data is minimized in units of resource elements, according to the size of the URLLC data. The URLLC resource 422 is allocated to a part or the whole of the system band in the frequency direction. In this embodiment, the allocation of the URLLC resource 422 is the resource allocation with priority in the frequency direction. Therefore, as compared with the case of priority allocation in the time axis direction (symbol direction), URLLC data can be transmitted in a shorter time, and wideband wireless transmission is performed, so that a frequency diversity effect can be easily obtained. Therefore, the transmission reliability of the URLLC data can be improved, and the probability of occurrence of retransmission of the URLLC data can be reduced, so that the delay of wireless transmission of the URLLC data can be reduced.

As shown in FIG. 3B, in this example, the transmission power P422 in the transmission band of the URLLC resource 422 in the frequency axis direction at the timing of transmitting the URLLC data, and the other eMBB resource 421. The transmission powers P421 in the transmission band are the same as each other.

Further, in the example of FIG. 3A, the DL control information transmitted to the mobile station 30 prior to the URLLC data includes the resource allocation information in the subframe 400. For example, the information defining the resource allocation area of the URLLC data (hereinafter, also referred to as “URLLC resource allocation information”) is the information defining the frequency range in the frequency axis direction to which the URLLC resource 422 is allocated (for example, of the subcarrier). (Identification information) and information defining a time range (eg, a symbol range) in the time axis direction. The mobile station 30 that has received the control information receives, demodulates, and decodes the URLLC data transmitted in the same subframe 400 based on the URLLC resource allocation information included in the control information at the head of the subframe 400. be able to.

Further, as shown in FIG. 3A, since the URLLC resource 422 is continuously allocated in the frequency axis direction, the amount of information of the URLLC resource allocation information included in the control information can be reduced.

Further, in FIGS. 3A and 3B, the URLLC data of the subframe 400 includes DMRS used for estimating a propagation path for demodulating the URLLC data from the received signal.

(Example 2)
FIG. 4A is an explanatory diagram showing another example of resource allocation of the subframe 400 in the wireless communication system according to the present embodiment, and FIG. 4B is a frequency at the time of transmitting URLLC data in the subframe 400. It is a graph which shows an example of the transmission power distribution in the axial direction. In FIGS. 4 (a) and 4 (b), the description of the parts common to those of FIGS. 3 (a) and 3 (b) described above will be omitted.

In the examples of FIGS. 4A and 4B, the transmission power P422 of the URLLC resource 422 is used under the condition that the average transmission power of the entire system band is maintained at a predetermined power at the transmission timing of the URLLC data. , The transmission power is controlled so as to be higher than the resource area other than the URLLC resource 422 (in this example, the eMBB resource 421'). By concentrating the transmission power on the URLLC resource 422 in this way, the reception quality of the URLLC data (URLLC packet) can be further improved, so that the retransmission occurrence rate of the URLLC data can be further reduced. Therefore, it is possible to further reduce the delay in the transmission of URLLC data.

The transmission power allocated to the eMBB resource 421'may be set to 0. In this case, it is equivalent to not allocating the eMBB resource at the transmission timing of the URLLC data.

(Example 3)
FIG. 5 is an explanatory diagram showing still another example of resource allocation of the subframe 400 in the wireless communication system according to the present embodiment. In FIG. 5, the description of the parts common to those in FIGS. 3 (a) and 4 (a) described above will be omitted.

In the example of FIG. 5, the URLLC resource 422 is allocated to the head portion in the time direction (the portion adjacent to the control channel region 410) in the data channel region of the subframe 400. In this example, by transmitting URLLC data at the beginning of the data channel area 420 of the subframe 400, a response (ACK / NACK) to the URLLC data can be received within the same subframe 400, or HARQ based on the response can be received. It becomes possible to perform retransmission by, and HARQ RTT (Round-Trip Time) can be reduced as much as possible.

(Example 4)
FIG. 6 is an explanatory diagram showing still another example of resource allocation of the subframe 400 in the wireless communication system according to the present embodiment. This example is an example when TDD (Time Division Duplex) is used as the duplex system. In FIG. 5, the description of the parts common to those in FIGS. 3 (a), 4 (a), and 5 above will be omitted.

In the example of FIG. 6, the URLLC resource 422 is allocated to the time-wise head portion (the portion adjacent to the control channel area 410) in the data channel area 420 of the subframe 400, and a technique called “Self-Contined TDD subframe” is used. It is applied to the data channel area 420. In this example, the response (ACK / NACK) to the URLLC data DL transmitted at the beginning of the data channel area 420 is moved by the HARQ-ACK / NACK resource 423 assigned to the subsequent area in the same data channel area 420. Received from station 30. HARQ retransmission control can be promptly performed based on the response (ACK / NACK) fed back from the mobile station 30 in the data channel region 420 of the same subframe 400. For example, it is possible to promptly determine the completion of transmission of URLLC data based on ACK, or to promptly retransmit URLLC data based on NACK. Therefore, it is possible to further reduce the delay in wireless transmission of URLLC data.

In the HARQ-ACK / NACK resource 423 of FIG. 6, the URLLC data may be retransmitted based on the HARQ response (NACK).

(Example 5)
FIG. 7A is an explanatory diagram showing still another example of resource allocation of the subframe 400 in the wireless communication system according to the present embodiment, and FIG. 7B is an explanatory diagram at the time of transmitting URLLC data in the subframe 400. It is a graph which shows an example of the transmission power distribution in the frequency axis direction. In FIGS. 7 (a) and 7 (b), the description of the parts common to those in FIGS. 3 to 6 described above will be omitted.

In the examples of FIGS. 7 (a) and 7 (b), a condition for maintaining the average transmission power of the entire system band at a predetermined power at the transmission timing of the response (ACK / NACK) to the URLLC data in the mobile station 30. Therefore, the transmission power is controlled so that the transmission power of the HARQ-ACK / NACK resource 423 is higher than that of the UL resource 424 other than the HARQ-ACK / NACK resource. By concentrating the transmission power on the HARQ-ACK / NACK resource 423 in the mobile station 30 in this way, the response (ACK / NACK) to the URLLC data can be more reliably fed back to the base station 20. It is possible to reduce the delay in data transmission. For example, it is possible to suppress the HARQ-ACK reception error and shorten the transmission delay time.

When the URLLC data is retransmitted based on the HARQ response (NACK) in the examples of FIGS. 7 (a) and 7 (b) by the HARQ-ACK / NACK resource 423 of FIG. 6, the transmission at the retransmission timing is performed. The transmission power may be controlled so as to increase the power more than other eMBB resources. The data transmission side (base station 20 in DL, mobile station 30 in UL) determines and controls the transmission power value to be allocated to the HARQ-ACK / NACK resource 423 so that the data reception side becomes the target value based on the required reception quality. It may be determined by closed-loop transmission power control that instructs (controls) the transmission power, or the data receiving side is a target value based on the required reception quality based on the reception power measurement result of the reference signal (reference signal) from the data transmission side. It may be determined by a case (open loop transmission power control) that is voluntarily controlled and determined so as to be.

Further, if the reception quality of the HARQ-NACK signal is poor and the HARQ-NACK signal cannot be received at a predetermined timing on the data transmitting side, it is generally considered that the HARQ-NACK has been received on the data transmitting side. Be done. Therefore, only when transmitting HARQ-ACK for URLLC data, a process that is higher than other eMBB resources is applied, and when transmitting HARQ-NACK, the transmission power is minimized and the power consumption of the mobile station is reduced. In order to save money, it is not necessary to perform a process of increasing the transmission power allocated to the HARQ-ACK / NACK resource 423 for the URLLC data to be higher than that of the eMBB resource.

(Example 6)
FIG. 8 is an explanatory diagram showing still another example of resource allocation of subframes in the wireless communication system according to the present embodiment. In FIG. 8, the description of the parts common to those in FIGS. 3 to 7 described above will be omitted.
In the example of FIG. 8, the entire URLLC data cannot be transmitted in one unit (one symbol time) of the resource element included in the subframe 400 composed of a plurality of symbols. Therefore, by allocating the URLLC resource 422 to the entire first symbol and a part of the second symbol at the beginning of the data channel area of the subframe 400 in the time axis direction, the URLLC resource allocation information included in the control information can be allocated. The amount of information is reduced, and URLLC data can be reliably transmitted within one subframe 400.

When it is necessary to increase the transmission power density allocated to the URLLC data resource, such as when the mobile station 30 is far from the base station 20 and the propagation loss is large, the transmission power allocation to the eMBB resource 421'can be set to 0 or URLLC. The bandwidth allocated to data resources may be reduced to further increase the amount of resources allocated along the time axis.

In the above examples of FIGS. 3 to 8, the URLLC resource 422 and the HARQ-ACK / NACK resource 423 are continuously allocated in the frequency axis direction of the subframe 400, but the frequency having a high propagation path gain in the radio section is allocated. May be preferentially assigned. For example, at least one of the URLLC resource 422 and the HARQ-ACK / NACK resource 423 may be assigned in a bitmap type distributed in a plurality of locations in the frequency axis direction and allocated discontinuously. Further, in order to obtain frequency diversity in an open loop, band-end distributed allocation may be performed by distributing and allocating to both ends of the system band in the frequency direction.

FIG. 9 is a functional block diagram showing an example of a base station 20 on the transmitting side in the wireless communication system according to the present embodiment. It should be noted that the same configuration can be made when the mobile station 30 is on the transmitting side.

In FIG. 9, the base station 20 includes a resource allocation unit 210 for URLLC data, a transmission unit 220, and an information storage unit 230.

When the URLLC data is included in the transmission target, the resource allocation unit 210 minimizes the resource allocation amount in the time direction of the URLLC data in the unit of the resource element in the data channel area of the subframe constituting the wireless frame. Then, the resource of the URLLC data (resource for URLLC) is allocated to a part or the whole of the system band in the frequency direction according to the size of the URLLC data. The resource allocation unit 210 may allocate the HARQ-ACK / NACK resource together with the URLLC resource in the same subframe 400. The transmission unit 220 transmits URLL data in the URLLC resource in the subframe 400 allocated by the resource allocation unit 210.

The resource allocation unit 210 includes, for example, a data size calculation unit 211, a resource determination unit 212, and an information storage unit 213.

The data size calculation unit 211 calculates the size of the URLLC data included in the transmission target transmitted in the subframe 400.

The resource determination unit 212 minimizes the resource allocation amount of the URLLC data in the time direction in the data channel area 420 of the subframe 400 in the unit of the resource element based on the size of the URLLC data calculated by the data size calculation unit 211. Under these conditions, the URLLC resource is determined so as to allocate the URLLC resource to a part or the whole of the system band in the frequency direction according to the size of the URLLC data. Further, when the URLLC resource and the HARQ-ACK / NACK resource are allocated in the same subframe 400, the resource determination unit 212 also determines the HARQ-ACK / NACK resource. The resource determination unit 212 passes the resource allocation information for both the determined URLLC resource or the URLLC resource and the HARQ-ACK / NACK resource to the transmission unit 220.

The transmission unit 220 includes a transmission data acquisition unit 221, a transmission signal generation unit 222, and a wireless communication unit 223.

The transmission data acquisition unit 221 acquires URLLC data addressed to the mobile station 30 from the core network 80 of the mobile communication network, for example. The transmission data acquisition unit 221 may acquire URLLC data from another mobile station, or may acquire URLLC data from an information processing device from a computer device such as MEC (Mobile Edge Computing) provided in the base station 20. .. When the wireless communication device on the transmitting side is the mobile station 30, the transmission data acquisition unit 221 may acquire data generated based on the outputs of various sensors, measuring devices, and the like provided in the mobile station 30.

The transmission signal generation unit 222 includes transmission data to be transmitted including eMBB data and URLLC data received from the transmission data acquisition unit 221, resource allocation information received from the resource allocation unit 210, and transmission parameters read from the information storage unit 230. Based on various information such as, the control information and transmission data transmitted in the subframe 400 are subjected to processing such as coding and modulation to generate a transmission signal. For example, resource allocation information for both the URLLC resource or the URLLC resource and the HARQ-ACK / NACK resource is arranged in the control channel area 410 of the subframe 400, and is placed in the URLLC resource of the data channel area 420 of the subframe 400. The transmission signal is generated so that the URLLC data is arranged and the eMBB data is arranged in a portion of the data channel area 420 other than the URLLC resource.

The wireless communication unit 223 performs predetermined frequency conversion and power amplification on the transmission signal generated by the transmission signal generation unit 222, and transmits the transmission signal as a wireless signal from the antenna 21. The wireless communication unit 223 may control to concentrate the power resource on the URLLC resource described above.

The information storage unit 230 stores various information such as transmission parameters used for allocating the URLLC resource and the HARQ-ACK / NACK resource.

FIG. 10 is a sequence diagram showing an example of transmission / reception of transmission data including downlink URLLC data according to the present embodiment. FIG. 10 is an example in which URLLC data is transmitted in the subframes of FIGS. 3 and 4 described above.

In FIG. 10, the base station 20 acquires transmission data to be transmitted including eMBB data and URLLC data to be transmitted in the target subframe (S101), calculates the size of the URLLC data (S102), and of the URLLC data. A resource for URLLC in the data channel area of the subframe is determined according to the size (S103).

Next, when the predetermined start timing of the target subframe arrives, the base station 20 transmits control information including the URLLC resource information in the control channel region (S104), and the timing corresponding to the URLLC resource arrives. Only eMBB data is transmitted by the eMBB resource up to (S105).

After that, when the timing corresponding to the URLLC resource arrives, the base station 20 transmits the URLLC data by the URLLC resource and also transmits the eMBB data by the eMBB resource.

When the transmission of the URLLC data is completed, the base station 20 transmits only the MBB data by the eMBB resource until the end of the subframe (S105).

FIG. 11 is a sequence diagram showing another example of transmission / reception of transmission data including downlink URLLC data according to the present embodiment. FIG. 11 is an example in which URLLC data is transmitted in the subframes of FIGS. 5 and 8 described above. Since steps S201 to S204 in FIG. 11 are common to those in FIG. 10, their description will be omitted.

In FIG. 11, after transmitting the control information (S204), the base station 20 transmits the URLLC data by the URLLC resource and also transmits the eMBB data by the eMBB resource (S205). When the transmission of the URLLC data is completed, the base station 20 transmits only the MBB data by the eMBB resource until the end of the subframe (S206 to S208).

FIG. 12 is a sequence diagram showing still another example of transmission / reception of transmission data including downlink URLLC data according to the present embodiment. FIG. 12 is an example in which URLLC data is transmitted in the subframes of FIGS. 6 and 7 described above. Since steps S301 to S305 in FIG. 12 are common to FIGS. 10 and 11, their description will be omitted.

In FIG. 12, when the transmission of the URLLC data is completed (S305), the base station 20 transmits only the MBB data by the eMBB resource until the transmission / reception timing of the response (HARQ-ACK / NACK) to the transmission of the URLLC data arrives. (S306 to S307).

Next, when the transmission / reception timing of the response (HARQ-ACK / NACK) arrives, the base station 20 receives the response (HARQ-ACK / NACK) from the mobile station 30 by the HARQ-ACK / NACK resource (S308). .. Upon receiving this response, the base station 20 may transmit MBB data using an eMBB resource other than the HARQ-ACK / NACK resource. Further, when the base station 20 receives a negative response, the base station 20 may retransmit the URLLC data to the mobile station 30 by using the HARQ-ACK / NACK resource.

After the reception of the response (HARQ-ACK / NACK), the reception of the response, and the retransmission of the URLLC data are completed, the base station 20 transmits only the MBB data by the eMBB resource until the subframe ends (S309). ).

In each of the plurality of embodiments of the wireless communication system described above, various antenna diversity may be applied between the base station 20 and the mobile station 30. The antenna diversity may be a spatial diversity using a plurality of spatially separated antennas (antenna ports), or may be a polarization diversity using a plurality of antennas (antenna ports) having different polarizations from each other. ..

13 (a), (b) and (c) are receive antenna diversity (SIMO diversity), transmit antenna diversity (MISO diversity) and transmit / receive antenna diversity (MIMO diversity) applicable to the wireless communication system according to the present embodiment, respectively. ) Is an explanatory diagram showing an example.

In the receiving antenna diversity of FIG. 13A, the mobile station 30 on the receiving side includes a plurality of antennas 31 (1) and 31 (2) having different positions or different polarization characteristics from each other. The mobile station 30 can improve the reception quality by selecting or synthesizing the reception signals of the plurality of antennas 31 (1) and 31 (2) that have undergone different fading. Therefore, it is possible to further reduce the delay in wireless transmission of URLLC data and improve the transmission reliability.

In the transmitting antenna diversity of FIG. 13B, the transmitting base station 20 includes a plurality of antennas 21 (1) and 21 (2) having different positions or different polarization characteristics from each other. The mobile station 30 receives a transmission signal transmitted from a plurality of antennas 21 (1) and 21 (2) of the base station 20 and has received different fadings from the antenna 31, and selects or synthesizes the plurality of received signals. Therefore, the reception quality can be improved. In particular, when the transmitting antenna diversity is applied, it is possible to improve the reception quality without relying on the higher order of the antenna diversity in a small mobile station where the antenna installation space is limited.

The transmit / receive antenna diversity (MIMO diversity) of FIG. 13 (c) is a combination of the receive antenna diversity of FIG. 13 (a) and the transmit antenna diversity of FIG. 13 (b). The base station 20 on the transmitting side and the mobile station 30 on the receiving side have a plurality of antennas 21 (1), 21 (2) and a plurality of antennas 31 (1), 31 ( 2) is provided. The mobile station 30 can improve the reception quality by selecting or synthesizing a plurality of received signals that have undergone different fading. In particular, when the transmission / reception antenna diversity is applied, it is possible to further improve the reception quality by acquiring the diversity gain on both the transmission side and the reception side.

In addition, as a method of realizing the transmission antenna diversity in FIGS. 13 (b) and 13 (c), for example, a method requiring acquisition of propagation path information on the transmission side and a method of acquiring propagation path information on the transmission side are performed. There is a way to make it unnecessary.

In a method that requires acquisition of propagation path information on the transmitting side, for example, control of transmission maximum ratio synthesis, beamforming, or transmission antenna selection is performed based on the propagation path information acquired on the transmitting side. In the transmission maximum ratio synthesis, the amplitude or phase of the transmission signal of each antenna port is controlled so that the maximum reception SNR can be obtained on the receiving side. In beamforming, only the phase of the transmitted signal of each antenna port is controlled. In the transmission antenna selection, control is performed so that only the transmission antenna port having a high propagation path gain is selected.

Methods that do not require the acquisition of propagation path information on the transmitting side include, for example, spatiotemporal coding (STC, STBC, etc. standardized by w-CDMA) and spatial frequency coding (SFC standardized by LTE) on the transmitting side. SFBC, etc.) or Circular Delay Diversity (eg "JH Song, JH Kim, HK Song," Space-Time Cyclic Delay Diversity Encoded Cooperative Transmissions for Multiple Relays, "IEICE Trans Commun., Vol.E92-B, No.6, pp By applying the technology of .2320-2323, June 2009), it is possible to acquire diversity gain without acquiring propagation path information on the transmitting side. In particular, when the circular delay diversity is applied, the diversity gain can be obtained without using special spatial coding.

As described above, according to the present embodiment, the resource allocation amount in the time direction in which low-delay transmission data such as URLLC data is transmitted in the data channel area 420 of the subframe 400 is minimized in units of resource elements to reduce the amount. Delayed transmission It is possible to reduce the delay in the transmission of data.

Further, by allocating the resource of the low delay transmission data to a part or the whole of the system band in the frequency direction, it becomes possible to apply the frequency diversity when transmitting the low delay transmission data. Due to the effect of this frequency diversity, it is possible to improve the transmission reliability of low-delay transmission data, suppress the occurrence of retransmission control during wireless transmission, and further reduce the delay in transmission of low-delay transmission data. Can be done.

Moreover, by allocating resources in the frequency direction of the low-delay transmission data in the data channel region 420 according to the size of the low-delay transmission data, resource allocation to the low-delay transmission data is performed to the minimum necessary, and low delay is achieved. Since the resource allocation area used for transmission of data other than transmission data can be increased, frequency utilization efficiency can be improved.

As described above, according to the present embodiment, the frequency utilization efficiency is improved, and the transmission reliability of low-delay transmission data such as URLLC data, which is required to be transmitted with lower delay than normal data such as eMBB data, is improved. Low delay transmission It is possible to reduce the delay in the transmission of data.

Further, according to the present embodiment, the power resource can be concentrated on the resource allocation area to which the low-delay transmission data is transmitted under the condition that the average transmission power of the entire system band is maintained at a predetermined power. Therefore, it is possible to improve the transmission reliability of the low-delay transmission data and reduce the delay in the transmission of the low-delay transmission data while maintaining the transmission power of the entire system band at a predetermined power.

The processing steps described herein and the components of the mobile communication system can be implemented by various means. For example, these processes and components may be implemented in hardware, firmware, software, or a combination thereof.

Regarding hardware implementation, means such as a processing unit used to realize the above steps and components in an entity (for example, various wireless communication devices, Node B, terminal, hard disk drive device, or optical disk drive device) One or more application-specific ICs (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), processors , Controllers, microcontrollers, microprocessors, electronic devices, other electronic units designed to perform the functions described herein, computers, or combinations thereof.

Further, for firmware and / or software implementation, means such as a processing unit used to realize the above components are programs (eg, procedures, functions, modules, instructions) that execute the functions described herein. , Etc.) may be implemented. In general, any computer / processor readable medium that clearly embodies the firmware and / or software code is a means such as a processing unit used to implement the steps and components described herein. May be used to implement. For example, the firmware and / or software code may be stored in memory and executed by a computer or processor, for example, in a control device. The memory may be mounted inside the computer or processor, or it may be mounted outside the processor. The firmware and / or software code may be, for example, a random access memory (RAM), a read-only memory (ROM), a non-volatile random access memory (NVRAM), a programmable read-only memory (PROM), or an electrically erasable PROM (EEPROM). ), FLASH memory, floppy (registered trademark) discs, compact discs (CDs), digital versatile discs (DVDs), magnetic or optical data storage devices, etc. good. The code may be executed by one or more computers or processors, or the computers or processors may be made to perform functional embodiments described herein.

Further, the medium may be a non-temporary recording medium. Further, the code of the program may be read and executed by a computer, a processor, or another device or device machine, and the format thereof is not limited to a specific format. For example, the code of the program may be any of source code, object code, and binary code, or may be a mixture of two or more of these codes.

Also, the description of the embodiments disclosed herein is provided to allow one of ordinary skill in the art to manufacture or use the present disclosure. Various amendments to this disclosure will be readily apparent to those of skill in the art and the general principles defined herein are applicable to other variations without departing from the spirit or scope of this disclosure. Therefore, this disclosure is not limited to the examples and designs described herein, but should be recognized in the broadest range consistent with the principles and novel features disclosed herein.

10 Wireless communication system 20 Base stations 21, 21 (1), 21 (2) Transmit antenna 30 Mobile station 31, 31 (1), 31 (2) Receive antenna 80 Core network of mobile communication network 210 Resource allocation unit 220 Transmission unit 400 Subframe 410 Control channel area 420 Data channel area 421 eMBB resource 422 URLLC resource 423 HARQ-ACK / NACK resource 424 UL resource other than HARQ-ACK / NACK resource

Claims (15)

It is a wireless communication device for mobile communication.
When low-delay transmission data that requires low-delay communication is included in the transmission target, the resource allocation amount in the time direction of the low-delay transmission data in the data channel area of the subframe constituting the wireless frame is a unit of the resource element. A resource allocation unit that allocates the resources of the low-delay transmission data to a part or the whole of the system band in the frequency direction according to the size of the low-delay transmission data under the condition of minimizing the data.
A transmission unit for transmitting the low-delay transmission data in the resource allocation area for the low-delay transmission data is provided.
The resource allocation unit, when using a TDD (Time Division Duplex) as duplex scheme, the time direction the head portion in the whole of the data channel region within the subframe, the allocation of the low-latency resources of the transmission data Rutotomoni, A response resource for receiving a retransmission control response to the low-delay transmission data from the destination of the low-delay transmission data is allocated to a part of the data channel region in the frequency direction.
Under the condition that the average power of the entire system band is maintained at a predetermined power in the frequency direction of the data channel region, the power of the response resource when receiving an acknowledgment (ACK) among the retransmission control responses is It is higher than the resource area other than the response resource, and the power of the response resource when receiving a negative response (NACK) among the retransmission control responses is the same as that of the resource area other than the response resource. in a radio communication apparatus characterized by. In the wireless communication device of claim 1,
The transmission unit is a wireless communication device, characterized in that, in a control channel region of the subframe, control information including information defining a resource allocation region of the low delay transmission data is transmitted. In the wireless communication device of claim 1 or 2,
The feature is that the response to the low-delay transmission data transmitted at the head portion of the data channel region in the time direction in the subframe is received by the response resource allocated to the subsequent region in the same data channel region. Wireless communication device. In the wireless communication device of claim 3,
A wireless communication device comprising retransmitting the low-delay transmission data based on the response received by the response resource allocated to the subsequent region in the same data channel region. In the wireless communication device of claim 1 or 2,
The resource allocation unit is a wireless communication device characterized in that resources of the low-delay transmission data are allocated to both ends in the frequency direction in the data channel region. In the wireless communication device according to any one of claims 1 to 5.
Under the condition that the average transmission power of the entire system band is maintained at a predetermined power in the frequency direction of the data channel region, the transmission power of the resource allocation region of the low delay transmission data is allocated to the resource allocation of the low delay transmission data. A wireless communication device including a transmission power control unit that controls transmission power so as to be higher than other resource areas other than the area . In any of the wireless communication device請Motomeko 1 to 6,
The transmission unit is a wireless communication device, characterized in that, in a resource allocation area of the low-delay transmission data, a reference signal for demodulating the low-delay transmission data is transmitted together with the low-delay transmission data. In the wireless communication device according to any one of claims 1 to 7.
The low-latency transmission data is a wireless communication device characterized in that it is data for URLLC (Ultra-Reliable and Low Latency Communications). The wireless communication device on the transmitting side that transmits the low-delay transmission data according to any one of claims 1 to 8 , and the wireless communication device on the receiving side that receives the low-delay transmission data transmitted from the wireless communication device on the transmitting side. And, a wireless communication system. In the wireless communication system of claim 9,
The receiving side wireless communication device is provided so as to receive the radio signals of the low-delay transmission data at different positions or to receive radio signals of different polarizations of the low-delay transmission data. A wireless communication system having an antenna and executing a receiving antenna diversity that selects or synthesizes a received signal received by each antenna. In the wireless communication system of claim 9 or 10.
The transmitting side wireless communication device is provided so as to transmit the radio signals of the low-delay transmission data at different positions or to transmit radio signals of different polarizations of the low-delay transmission data. A wireless communication system having an antenna and executing a transmission antenna diversity that selects or synthesizes a transmission signal to be transmitted by each antenna. In the wireless communication system of claim 11,
The transmission side wireless communication device is a wireless communication system characterized in that the transmission antenna diversity is executed by performing spatiotemporal coding or spatial frequency coding on the low delay transmission data. In the wireless communication system of claim 11,
The transmission antenna diversity is a wireless communication system characterized by being a circulation delay diversity. It ’s a wireless communication method.
When a mobile communication wireless communication device includes low-delay transmission data that requires low-delay communication as a transmission target, the low-delay transmission data is in the time direction in the data channel region of the subframe constituting the wireless frame. Under the condition that the resource allocation amount is minimized in units of resource elements, a part or the whole of the system band in the frequency direction according to the size of the low-delay transmission data, and the data channel region in the subframe. Allocating the resource of the low-delay transmission data to the first part in the time direction in the whole,
The wireless communication device transmits the low-delay transmission data in the resource allocation area of the low-delay transmission data.
When the wireless communication device uses TDD (Time Division Duplex) as the duplex system, the resource of the low delay transmission data is allocated to the head portion in the time direction in the entire data channel region in the subframe, and the resource of the low delay transmission data is allocated. the portion of the frequency direction of the data channel region, viewed including assigning a response resource, the receiving the retransmission control response to the low delay transmission data from the transmission destination of the low delay transmission data,
Under the condition that the average power of the entire system band is maintained at a predetermined power in the frequency direction of the data channel region, the power of the response resource when receiving an acknowledgment (ACK) among the retransmission control responses is It is higher than the resource area other than the response resource, and the power of the response resource when receiving a negative response (NACK) among the retransmission control responses is the same as that of the resource area other than the response resource. in a radio communication method characterized by. A program executed by a computer or processor provided in a wireless communication device for mobile communication.
When low-delay transmission data that requires low-delay communication is included in the transmission target, the resource allocation amount in the time direction of the low-delay transmission data in the data channel area of the subframe constituting the wireless frame is a unit of the resource element. At the beginning of the data channel region in the subframe, which is a part or the whole of the system band in the frequency direction, depending on the size of the low-delay transmission data. Program code for allocating resources for low-latency transmission data,
The program code for transmitting the low-delay transmission data in the resource allocation area of the low-delay transmission data, and
When TDD (Time Division Duplex) is used as the duplex system, the resource of the low delay transmission data is allocated to the head portion in the time direction in the entire data channel region in the subframe, and the resource of the low delay transmission data is allocated and the frequency direction of the data channel region. some of have a, and program code for assigning a response resource for receiving a retransmission control response to the low delay transmission data from the transmission destination of the low delay transmission data,
Under the condition that the average power of the entire system band is maintained at a predetermined power in the frequency direction of the data channel region, the power of the response resource when receiving an acknowledgment (ACK) among the retransmission control responses is It is higher than the resource area other than the response resource, and the power of the response resource when receiving a negative response (NACK) among the retransmission control responses is the same as the power of the resource area other than the response resource. in it, program characterized by.

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