JP5051136B2 - Wireless communication apparatus and wireless communication method - Google Patents

Description

The present invention relates to a wireless communication apparatus and a wireless communication method for performing wireless communication according to a predetermined wireless frame. For example, the present invention is preferably applied to a wireless communication apparatus that uses a wireless frame having the same format as a wireless frame used in the WiMAX system.

  As a next-generation mobile communication high-speed access network, a wireless standard called WiMAX (world interoperability for microwave access) standardized by IEEE (American Institute of Electrical and Electronics Engineers) attracts attention. WiMAX is a wide-area wireless access standard that enables wireless data communication of a maximum of 70 Mb / s to users with a radius of several kilometers.

  Unlike wireless LANs that are supposed to be used for communication inside buildings, WiMAX is assumed to be used at the end of a subscriber network (so-called “last one mile”) carried by a telephone line or optical fiber. (There are actually two types of standards for fixed stations and mobile devices, depending on the application).

  Recently, based on the WiMAX specification, a relay station (RS: Relay Station) is arranged between a base station (BS: Base Station) and a mobile terminal (MS: Mobile Station). By relaying communication between MSs, MR (Mobile Multi-hop Relay) technology aimed at expanding BS area, dead zone countermeasures to dead zones where radio waves do not reach, and improving throughput is IEEE802.16 Relay. It is actively discussed at TG (Task Group).

  Since WiMAX is based on infrastructure communication between BS and MS, Down Link (DL) from BS to MS and Up Link (UL) from MS to BS are completely separated on the frame format. ing. Furthermore, in MR, the RS has a transmission / reception function for each of the BS located upstream and the MS located downstream.

  16 and 17 are diagrams showing MR frames. FIG. 16 shows a frame format transmitted / received by the BS, and FIG. 17 shows a frame format transmitted / received by the RS. Note that the BS used in MR is particularly called MR-BS. The link between MR-BS and RS is called Relay link, and the link between RS and MS is called Access link.

  In WiMAX, a radio frame including control information including a preamble that is a radio frame synchronization signal, an FCH (Frame Control Header) for radio frame control, and area allocation information (MAP) in the radio frame is configured and allocated to communication. Data is inserted into a burst data area (burst area) in the radio frame, and data is transmitted and received between MR-BS, RS, and MS.

  For easy understanding of the flow of each zone in the frame, FIG. 18 shows the transmission / reception operation of each zone constituting the MR-BS frame, and FIG. 19 shows the transmission / reception operation of each zone constituting the RS frame.

  The MR-BS frame transmitted and received by the MR-BS shown in FIG. 16 includes a downlink DL Sub frame and an uplink UL Sub frame. The DL Sub frame includes a DL Access Zone indicating information transmitted from the MR-BS to the MS, and a DL Relay Zone indicating information transmitted from the MR-BS to the RS.

  The UL Sub frame is composed of a UL Access Zone indicating information transmitted from the MS to the MR-BS, and a UL Relay Zone indicating information transmitted from the RS to the MR-BS (in the figure). The blank part is the data storage area).

  The RS frame transmitted and received by the RS shown in FIG. 17 includes a downlink DL Sub frame and an uplink UL Sub frame. The DL Sub frame includes a DL Access Zone indicating information transmitted from the RS to the MS and a DL Relay Zone indicating information transmitted from the MR-BS to the RS.

  The UL Sub frame is composed of a UL Access Zone indicating information transmitted from the MS to the RS and a UL Relay Zone indicating information transmitted from the RS to the MR-BS (blank portion in the figure). Is a data storage area).

  As an RS operation mode, a DL Access Zone frame is transmitted in the DL transmission mode (RS → MS), and a DL Relay Zone frame is received in the DL reception mode (MR-BS → RS). In the UL transmission mode (RS → MR-BS), the UL Relay Zone frame is transmitted. In the UL reception mode (MS → RS), the UL Access Zone frame is received.

  Note that both the MR-BS frame and the RS frame include preamble, FCH, DL MAP, and UL MAP as control information in the DL Access Zone, and R-FCH, DL R-MAP as control information in the DL Relay Zone. , UL R-MAP included. 16 and 17, TTG (Transmit / receive Transition Gap) and RTG (Receive / transmit Transition Gap) indicate gap sections between zones.

  As described above, in the WiMAX frame format considering MR, each DL / UL subframe is time-divided for the relay link between the MR-BS and the RS and the access link between the RS and the MS. By adopting a frame in the order of, DL Relay Zone, UL Access Zone, UL Relay Zone, RS adopts a method that realizes transmission / reception switching only once in each DL / UL subframe. ing.

  Here, the transmission / reception switching is performed once within the subframe, that is, within the DL subframe of the RS frame, the transmission / reception mode is switched once depending on the DL Access Zone and DL Relay Zone. This also means that the transmission / reception mode is switched once by the UL Access Zone and the UL Relay Zone in the UL Sub frame of the RS frame.

As a conventional wireless communication technique, when a wireless communication terminal is capable of wireless communication using an ad hoc network, a technique for performing communication using narrow area wireless communication without using a mobile network has been proposed (for example, Patent Document 1). .
JP 2006-304004 (paragraph numbers [0013] to [0017], FIG. 1)

  However, in the WiMAX communication method described above, communication between MSs for realizing ad hoc communication (a communication mode in which there is no access point and communicates with each other on the spot and on the spot). This communication is not considered at present.

For this reason, when communication is performed between MSs, the base station BS is always mediated, and there is a problem that efficient ad hoc communication between MSs cannot be performed.
The present invention has been made in view of these points, and an object of the present invention is to provide a wireless communication apparatus that realizes communication between terminal apparatuses without using a base station.
Another object of the present invention is to provide a wireless communication method for realizing communication between terminal devices without using a base station.

In order to solve the above problems, a wireless communication device is provided. The radio communication device includes a frame generation unit that generates a radio frame including a downlink subframe and an uplink subframe, and a communication control unit that performs generation control of the radio frame, and the communication control unit includes: When performing wireless communication via a base station or a relay station, the downlink subframe is communicated in a downlink wireless access section that is a downlink wireless section between the base station or the relay station and the own apparatus. Time-divided into a first downlink communication period to be performed and a second downlink communication period in which communication is performed in a downlink radio relay section that is a downlink radio section between the base station and the relay station, and the uplink the sub-frame, the a base station or the relay station, the communication in the uplink radio access period is an uplink radio section between the own device Performing a first uplink communication period, and time-divided into a second uplink communication period in which communication is performed the uplink radio repeater section is an uplink radio section of the base station and the relay station, the radio When performing frame generation control and performing wireless communication between devices without going through the base station or the relay station , the first downlink communication period is extended to the second downlink communication period. Or extending the second downlink communication period to the first downlink communication period, extending the first uplink communication period to the second uplink communication period, or the second up The generation of the radio frame is controlled by extending the link communication period to the first uplink communication period.

Ad hoc communication efficiency between devices can be increased. In addition, transmission can be performed or reception can be performed using the first communication period of the radio frame.
In particular, when a radio frame corresponds to a radio frame in the WiMAX system, transmission and reception of a radio signal can be performed using a UL (or DL) burst data area. In particular, by mounting a communication device in a vehicle, wireless signals can be transmitted and received between vehicles using a UL (or DL) burst data area.

  In addition, since the transmission / reception switching operation in the first communication period in the radio frame can be limited to one time, it is also suitable when using the WiMAX frame format handled by the RS when MR is introduced.

  These and other objects, features and advantages of the present invention will become apparent from the following description taken in conjunction with the accompanying drawings which illustrate preferred embodiments by way of example of the present invention.

It is a principle figure of a radio | wireless communication apparatus. It is a figure which shows the structure of a mobile terminal. It is a figure which shows the flame | frame (1st radio | wireless frame) at the time of transmitting data in the 1st communication period of DL frame. It is a figure which shows the flame | frame (2nd radio | wireless frame) at the time of receiving data in the 1st communication period of a DL frame. It is a figure which shows the flame | frame (1st radio | wireless frame) at the time of transmitting data using UL burst data area | region (1st communication period). It is a figure which shows the flame | frame (2nd radio | wireless frame) at the time of receiving data using UL burst data area | region (1st communication period). It is a figure which shows the modification of a flame | frame. It is a figure which shows the modification of a flame | frame. It is a figure which shows the flame | frame by which the burst was divided | segmented in the time direction and the frequency direction. It is a figure which shows the flame | frame by which the burst was divided | segmented in the time direction and the frequency direction. It is a figure which shows the flame | frame by which the burst was divided | segmented in the time direction and the frequency direction. It is a figure which shows the flame | frame by which the burst was divided | segmented in the time direction and the frequency direction. It is a figure which shows communication between vehicles. It is a figure which shows communication between vehicles. It is a figure which shows a mode that transmission control of a flame | frame is performed using redundant encoding. It is a figure which shows the flame | frame of MR. It is a figure which shows the flame | frame of MR. It is a figure which shows the transmission / reception operation | movement of each zone which comprises an MR-BS frame. It is a figure which shows the transmission / reception operation | movement of each zone which comprises RS frame.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a principle diagram of a wireless communication apparatus. The wireless communication device 10 includes a frame generation unit 11, a frame reception processing unit 12, and a communication control unit 13.

  The frame generation unit 11 generates a frame corresponding to a UL (Up Link) frame and a frame corresponding to a DL (Down Link) frame in the WiMAX system. The frame reception processing unit 12 performs reception processing of UL frames and DL frames transmitted from other terminals. The communication control unit 13 performs transmission / reception control of the UL frame and the DL frame.

The UL frame specifically corresponds to the UL subframe described above with reference to FIG. 17, and the DL frame corresponds to the DL subframe described above with reference to FIG.
Next, a configuration of the wireless communication device (mobile terminal) when the wireless communication device 10 is mounted on a moving body such as a car and the same wireless frame as that used in the WiMAX system is used will be described. FIG. 2 is a diagram showing the configuration of the mobile terminal. The mobile terminal 2 has a function of performing transmission / reception of a radio frame similar to the radio frame used by the RS in the WiMAX system in which the RS is introduced, and includes a data transmission / reception unit 21, a frame generator 22, a frame decoder 23, a frame controller 24, and switches SW1 to SW1. SW3, transmission unit 25, reception unit 26, and antenna 27 are provided.

  The frame generator 22 includes a UL frame generator 22a and a DL frame generator 22b, and the frame decoder 23 includes a UL frame decoder 23a and a DL frame decoder 23b.

  The frame generator 22 corresponds to the frame generation unit 11 in FIG. 1, and the frame decoder 23 corresponds to the frame reception processing unit 12 in FIG. Furthermore, the function of the communication control unit 13 in FIG. 1 is realized by the frame controller 24, the switches SW1 to SW3, the transmission unit 25, and the reception unit 26.

  The data transmitter / receiver 21 generates data to be transmitted to other mobile terminals, and transmits the data to the UL frame generator 22a and the DL frame generator 22b. In addition, data received from the UL frame decoder 23a or DL frame decoder 23b is received and data reception processing is performed.

  The UL frame generator 22a generates a frame corresponding to the UL Relay Zone in the UL subframe of the RS frame described above with reference to FIG. 17 in the UL frame transmission mode. In the DL frame transmission mode, the DL frame generator 22b generates a frame corresponding to the DL Access Zone in the DL subframe of the RS frame described above with reference to FIG. Note that frames (burst data areas) corresponding to both zones are used for data transmission to other mobile terminals, and when the mobile terminal 2 wishes to transmit data, data is transmitted using a part of the burst data areas. I do.

Here, a part shows one partitioned area partitioned by UL MAP data or DL MAP data.
The UL frame decoder 23a decodes frame information corresponding to the UL Access Zone in the UL subframe of the RS frame described above with reference to FIG. 17 in the UL frame reception mode. The DL frame decoder 23b decodes frame information corresponding to the DL relay zone in the DL subframe of the RS frame described above with reference to FIG. 17 in the DL frame reception mode.

  The frame controller 24 performs control such as adjusting the length of the transmission / reception zone of each subframe, performs overall operation control of the frame generator 22 and the frame decoder 23, and further performs switching control of the switches SW1 to SW3.

  The transmission unit 25 receives the frame signal output from the UL frame generator 22a or the DL frame generator 22b connected by the switch SW1, up-converts the frame signal into a radio signal, and transmits the frame signal from the antenna 27 via the switch SW3. To do.

  The receiving unit 26 generates a frame signal by down-converting the radio signal received by the antenna 27 connected by the switch SW3, and outputs the frame signal to the UL frame decoder 23a or the DL frame decoder 23b connected by the switch SW2. To do.

Next, when performing inter-terminal communication, MR-based frames transmitted and received by the mobile terminal 2 will be described together with the switching operation shown in the configuration of FIG.
FIG. 3 is a diagram illustrating a frame (first radio frame) when data is transmitted in the first communication period of the DL frame. The mobile terminal 2 wishes to transmit data, and in a frame in which data is transmitted, the mobile terminal 2 operates in the transmission mode (transmission / reception switching is not required) in the DL burst region (first communication period) in the DL subframe (specifically, transmission / reception is not required). In this case, all the DL subframes are interpreted as a transmission allowable period similar to the DL Access Zone and data is transmitted), and necessary data is transmitted at its own transmission timing. In this case, the UL burst area corresponds to the second communication period.

  That is, data is inserted and transmitted in the DL burst data area in the DL subframe. For example, in the figure, data is inserted and transmitted in the seventh burst (section) counted from the left burst. In the switching operation in this case, the switch SW1 is connected to the terminal s2, and the switch SW3 is connected to the terminal Tx.

Although there is a portion where data is not transmitted in the DL burst data area, it is assumed here that switching to the reception operation is not performed during that time.
Each mobile terminal 2 transmits MAP data indicating the preamble and frame structure in the figure, but it is not always necessary to transmit the MAP data. By sharing the MAP data in each mobile terminal, the boundary of the unit for storing data in the burst data area is known in each mobile terminal, and the communication control unit performs the transmission / reception operation according to the known structure. Because it is good.

  Even if it is not known, the frame reception processing unit 12 first receives MAP data transmitted from another mobile terminal 2 to obtain the frame structure, and then performs transmission / reception control according to the structure. .

  FIG. 4 is a diagram illustrating a frame (second radio frame) when data is received in the first communication period of the DL frame. In this frame, the mobile terminal 2 does not wish to transmit data and does not transmit data, so the mobile terminal 2 operates in the reception mode over the entire DL burst data area (first communication period) (specifically, Receives data by interpreting it as a DL Relay Zone area), and receives data from other terminals. In the switching operation in this case, the switch SW2 is connected to the terminal s4, and the switch SW3 is connected to the terminal Rx.

The above is an example in which wireless communication is performed between mobile terminals using the DL burst data area. Next, a case where the UL burst data area is used will be described.
In the following example, the UL burst data area corresponds to the first communication period, and the DL burst data area corresponds to the second communication period.

  FIG. 5 is a diagram showing a frame (first radio frame) when data is transmitted using the UL burst data area (first communication period). The mobile terminal 2 operates in the transmission mode in the UL burst data area in the frame in which the mobile terminal 2 transmits data (specifically, all the UL subframes are interpreted as a transmission period like the UL Relay Zone and data is transmitted). Transmission), data is transmitted at its own transmission timing.

  That is, data desired to be transmitted is transmitted in bursts in the data area. For example, in the figure, data is inserted and transmitted in the 10th burst counted from the left burst. In the switching operation in this case, the switch SW1 is connected to the terminal s1, and the switch SW3 is connected to the terminal Tx.

  FIG. 6 is a diagram illustrating a frame (second radio frame) when data is received using the UL burst data area (first communication period). The mobile terminal 2 operates in the reception mode in the UL burst data area in the frame in which the mobile terminal 2 does not transmit data (specifically, the mobile terminal 2 receives the data by interpreting the reception period as in the UL Access Zone area) Receive data from other terminals. In the switching operation in this case, the switch SW1 is connected to the terminal s3, and the switch SW3 is connected to the terminal Rx.

  Next, a modified example of the frame shown in FIGS. 3 and 5 will be described. FIG. 7 is a frame showing a modification of FIG. In the frame in which the mobile terminal 2 transmits data, the mobile terminal 2 switches between the transmission mode and the DL reception mode before or after the portion of the DL burst data area where the data is transmitted (preferably, the DL burst mode). Only once in the data area).

  For example, before performing data transmission, transmission data from another mobile terminal is received by performing a reception operation, and when performing data transmission, control is performed to switch from the reception mode to the transmission mode.

Alternatively, the transmission mode is set until data transmission is performed, and after the data transmission is performed, control for switching from the transmission mode to the reception mode is performed.
In FIG. 7, the front side of the DL burst data area is an area that can be transmitted by itself (corresponding to the DL Access Zone transmission mode), and the reception mode (DL Relay Zone reception from the rear side of the burst). Mode). In the switching operation in this case, the switch SW1 is connected to the terminal s2 and the switch SW3 is connected to the terminal Tx in the period corresponding to the DL Access Zone, and the switch SW2 is connected to the terminal s4 in the period corresponding to the DL Relay Zone. The switch SW3 is connected to the terminal Rx. Also, the frame that does not transmit its own data paired with the frame that transmits its own data shown in FIG. 7 is the same as the frame of FIG.

In FIG. 7, it is possible to set the reception mode in the burst data area before the transmission of the own data, and the transmission mode from the transmission of the own data.
FIG. 8 is a frame showing a modification of FIG. In the frame in which the mobile terminal 2 transmits data, the mobile terminal 2 operates by switching between the reception mode and the transmission mode before or after the burst in which the data is transmitted in the UL subframe.

  In FIG. 8, the rear side of the UL burst data area is an area that can be transmitted by itself (corresponding to UL Relay Zone transmission mode), and the front side of the burst is in reception mode (UL Access Zone reception mode). Support). In this case, in the UL Access Zone, the switch SW2 is connected to the terminal s3, the switch SW3 is connected to the terminal Rx, and in the UL Relay Zone, the switch SW1 is connected to the terminal s1, and the switch SW3 is connected to the terminal Tx. Connecting. Also, the frame that does not transmit its own data paired with the frame that transmits its own data shown in FIG. 8 is the same as the frame of FIG.

In FIG. 8, it is possible to set the transmission mode in the burst data area until the transmission of the own data, and the reception mode after the transmission of the own data.
Next, a description will be given of a frame to which an OFDMA (Orthogonal Frequency Domain Multiple Access) communication method that performs flexible multiplexing to a radio frame by arranging data in the time direction (symbol) and the frequency direction (logical subchannel). . By using the OFDMA format, the data storage area (burst) used by each terminal in the subframe can be divided in the time direction, the frequency direction, or both. In the following FIGS. 9 to 12, frames when divided in both the time direction and the frequency direction are shown.

  FIG. 9 shows that the burst in the DL subframe is divided in both the time direction and the frequency direction with respect to the frame shown in FIG. 7, and transmission data is inserted into one divided burst. It is shown. FIG. 10 shows a state in which the burst in the DL subframe is divided in both the time direction and the frequency direction with respect to the frame shown in FIG. One received data is inserted.

  In FIG. 11, the burst in the UL subframe is divided in both the time direction and the frequency direction with respect to the frame shown in FIG. 8, and transmission data is inserted into one divided burst. It is shown. FIG. 12 shows a state in which the burst in the UL subframe is divided in both the time direction and the frequency direction with respect to the frame shown in FIG. One received data is inserted.

  As described above, by generating a frame by applying OFDMA, the data storage area (burst) used by each terminal in the subframe can be divided in the time direction, the frequency direction, or both, so it is further subdivided Data transmission / reception between the mobile terminals can be performed with the determined burst size.

  Next, the case where the present invention is applied to inter-vehicle communication for advanced safety vehicles of ITS (Intelligent Transport System) will be described. In the advanced safety vehicle application, each vehicle broadcasts information such as the position, speed, and driving operation of its own vehicle to surrounding vehicles. In addition, the information transmitted from the surrounding vehicles is used to detect dangers such as accidents that are predicted in advance in each vehicle, and warn the driver or perform intervention control for driving.

  FIG. 13 is a diagram showing inter-vehicle communication. Each of the vehicles # 1 and # 2 has the mobile terminal 2 shown in FIG. The vehicles # 1 and # 2 are synchronized in advance at the frame level, and the burst area for inter-vehicle communication is also known in advance for each vehicle.

  Here, in time zone t1, vehicle # 1 has transmission data, vehicle # 2 has no transmission data, and in time zone t2, vehicle # 2 has transmission data. It is assumed that vehicle # 1 does not have transmission data.

  In the time zone t1, first, the vehicles # 1 and # 2 transmit together the header information of the preamble, FCH, DL MAP, and UL MAP at the head of the frame according to the DL Access Zone of the RS frame. (Note that MAP or the like may not be transmitted.) In vehicle # 2, which does not have transmission data, when header information is transmitted, the mode transits to the DL Relay Zone reception mode and receives data transmitted from vehicle # 1. Enter the state.

  Vehicle # 1 having transmission data selects a burst in the DL subframe and transmits its own data according to the transmission mode of the DL Access Zone that is the same as when the header information is transmitted. In the burst data area, the area where data is actually transmitted is selected from a part of the burst data area divided by the MAP data.

By such an operation, the information transmitted from the vehicle # 1 is received by the vehicle # 2. In the time zone t2, a transmission / reception operation opposite to the above is performed.
Although FIG. 13 shows the case where the DL subframe format is used for inter-vehicle communication, UL Relay Zone and UL Access Zone, which are UL subframe formats, may be used for inter-vehicle communication. Moreover, the format of the modification shown in FIGS. 7 and 8 and the frame to which OFDMA shown in FIGS. 9 to 12 are applied can also be used.

  FIG. 14 is a diagram showing inter-vehicle communication. In FIG. 13, the same information transmitted from each vehicle is transmitted only once. However, as shown in FIG. 14, the same information may be transmitted repeatedly using bursts in different frames. .

  Here, the vehicle # 1 performs data transmission using the DL Access Zone transmission mode in the time zone t1, but the vehicle # 2 also uses the DL Access Zone transmission mode in the time zone t1, so the vehicle # 2 2, it is assumed that information from the vehicle # 1 cannot be received in the time zone t1.

  In this case, the vehicle # 1 transmits the same data as that transmitted in the time zone t1 using the DL Access Zone transmission mode also in the time zone t2. In the vehicle # 2, the DL Relay Zone reception mode is used in the time zone t2, so that the vehicle # 2 can receive information from the vehicle # 1.

  As described above, by repeatedly transmitting the same information using bursts in a plurality of different frames, it is possible to reduce the probability that the receiving terminal cannot be received because it is in the transmission mode.

  It is possible to reduce the probability of selecting the same transmission frame between vehicles by performing control to randomly select a transmission time zone of a frame transmitted by each vehicle. Furthermore, at the time of data transmission, transmission burst selection may be divided as in the first half / second half in a subframe. As a result, even when a plurality of terminals select the same transmission frame, since one of the frames is in the transmission mode / one is in the reception mode, it is possible to reduce the probability that both cannot be received stochastically. Is possible.

  Next, a case where frame transmission control is performed using redundant coding will be described. The frame generator 22 of the mobile terminal 2 generates a codeword in which a redundant code is added to data to be transmitted, divides it into m blocks, and among the m blocks, n (<m) blocks are included. Insert m blocks, which can be played back when received on the receiving side, into m different frames to generate a frame to be transmitted. Then, m frames are transmitted from the mobile terminal 2. Hereinafter, an inter-vehicle communication system will be described as an example.

  FIG. 15 is a diagram showing how frame transmission control is performed using redundant coding. In the example of inter-vehicle communication shown in the figure, in vehicle # 1, transmission data x is divided into two blocks, a redundant code using one parity c is added, and three (= m) different blocks are provided. In the example, a, b, and c are transmitted using bursts of different frames. In this case, if 2 (= n) blocks of the divided data are received, the original data can be restored on the receiving side.

  For example, in the vehicle # 1, assuming that the transmission data x is 10010011 and the divided data a is 1001 and the divided data b is 0011, 1010 is generated by taking the exclusive OR of 1001 and 0011 as the parity c. At this time, even if the vehicle # 2 cannot receive the divided data b 0011, if the divided data a 1001 and the parity c 0011 are received, the vehicle # 2 takes the exclusive OR of 1001 and 0011. 0011 of the divided data b can be reproduced.

  As described above, even if the divided data a and parity c can be received and the divided data b cannot be received on the receiving side, the divided data b can be restored from the divided data a and parity c. The arrival rate can be improved.

  As described above, when inter-terminal communication is realized using an IEEE802.16j (MR) RS frame, each mobile terminal transmits a DL Access Zone (or UL Relay) in a frame in which data is transmitted by itself. In a frame that operates in the same mode as the Zone) and does not transmit data, it operates in the same mode as the DL Relay Zone (or UL Access Zone). Since the transmission / reception switching operation is no more than once and conforms to the current RS specifications in MR, the RS function can be used for communication between terminals.

  Also, it is a frame in which data is transmitted by itself, before (or after) data transmission, operates in DL frame transmission and DL frame reception (or UL frame reception and UL frame transmission). Even if the mode is switched, transmission / reception switching within each DL / UL subframe will be less than once within the range expected for the RS operation of the MR specification, and communication between terminals will be realized using the RS function. It becomes possible.

  Furthermore, in a frame for transmitting its own data, a DL (or UL) transmission subframe is divided into symbols in the time direction, logical subchannels in the frequency direction, or both directions, thereby enabling bursts to be communicated between terminals. It becomes possible to adjust the data size to fit.

  Furthermore, since the same data is repeatedly transmitted, even if the receiving side cannot receive a frame in a certain time zone, it can be received in another time zone, and the information reachability can be improved. It becomes possible.

  Furthermore, by performing transmission control of a plurality of divided frames using appropriate redundant coding, even if the receiving side cannot receive bursts of some frames, transmission data is received from data of other received bursts. Since it can be reproduced, it is possible to improve the reachability of information.

  The above merely illustrates the principle of the present invention. In addition, many modifications and changes can be made by those skilled in the art, and the present invention is not limited to the precise configuration and application shown and described above, and all corresponding modifications and equivalents may be And the equivalents thereof are considered to be within the scope of the invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Wireless communication apparatus 11 Frame generation part 12 Frame reception process part 13 Communication control part

Claims (7)

A frame generation unit that generates a radio frame including a downlink subframe and an uplink subframe;
A communication control unit that performs generation control of the radio frame;
With
The communication control unit
When performing wireless communication via a base station or relay station ,
The downlink subframe,
A first downlink communication period in which communication is performed in a downlink radio access section that is a downlink radio section between the base station or the relay station and the own apparatus; and a downlink radio section between the base station and the relay station second divided and two o'clock downlink communication period in which communication is performed downlink radio repeater section is,
The uplink subframe is
A first uplink communication period in which communication is performed in the uplink radio access section that is an uplink radio section between the base station or the relay station and the own apparatus; and an uplink radio section between the base station and the relay station in a uplink second uplink is divided at a communication period and the secondary communication is performed wirelessly repeating section performs generation control of the radio frame,
When performing wireless communication between devices without going through the base station or the relay station ,
Extending the first downlink communication period to the second downlink communication period, or extending the second downlink communication period to the first downlink communication period;
Control generation of the radio frame by extending the first uplink communication period to the second uplink communication period, or extending the second uplink communication period to the first uplink communication period. I do,
A wireless communication apparatus.   The radio communication apparatus according to claim 1, wherein the communication control unit switches a transmission / reception mode without using region allocation information in the radio frame from a base station.   The wireless communication apparatus according to claim 1, wherein the communication control unit switches a transmission / reception mode in units of the wireless frame according to presence / absence of transmission of own data.   The communication control unit, when transmitting its own data, transmits the radio frame including the downlink subframe into which the own data is inserted during the extended first downlink communication period to the downlink side,
  The wireless communication apparatus according to claim 3, wherein when the own data is not transmitted, the extended second downlink communication period is set as a communication period for receiving other data.   The communication control unit, when transmitting its own data, transmits the radio frame including the uplink subframe into which the own data is inserted during the extended second uplink communication period to the uplink side,
  The wireless communication apparatus according to claim 3, wherein when the own data is not transmitted, the extended first uplink communication period is a communication period for receiving other data.   The wireless communication apparatus according to claim 1, wherein the communication control unit switches a transmission / reception mode within the wireless frame in response to a transmission timing of own data. When performing generation control of a radio frame including a downlink subframe and an uplink subframe,
When performing wireless communication via a base station or relay station ,
The downlink subframe,
A first downlink communication period in which communication is performed in a downlink radio access section that is a downlink radio section between the base station or the relay station and the own apparatus; and a downlink radio section between the base station and the relay station second divided and two o'clock downlink communication period in which communication is performed downlink radio repeater section is,
The uplink subframe is
A first uplink communication period in which communication is performed in the uplink radio access section that is an uplink radio section between the base station or the relay station and the own apparatus; and an uplink radio section between the base station and the relay station in a uplink second uplink is divided at a communication period and the secondary communication is performed wirelessly repeating section performs generation control of the radio frame,
When performing wireless communication between devices without going through the base station or the relay station ,
Extending the first downlink communication period to the second downlink communication period, or extending the second downlink communication period to the first downlink communication period, and the first uplink communication Extending the period to the second uplink communication period, or extending the second uplink communication period to the first uplink communication period, and performing generation control of the radio frame,
A wireless communication method.

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