JP4912958B2 - Communication method and transmitter using the same - Google Patents

Communication method and transmitter using the same Download PDF

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JP4912958B2
JP4912958B2 JP2007148142A JP2007148142A JP4912958B2 JP 4912958 B2 JP4912958 B2 JP 4912958B2 JP 2007148142 A JP2007148142 A JP 2007148142A JP 2007148142 A JP2007148142 A JP 2007148142A JP 4912958 B2 JP4912958 B2 JP 4912958B2
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retransmission control
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JP2008301409A (en
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真裕美 甲村
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京セラ株式会社
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  The present invention relates to a communication technique, and more particularly, to a communication method for executing communication with a receiving apparatus and a transmitting apparatus using the same.

In a mobile communication system composed of a radio base station and a radio mobile station, the radio base station allocates a channel as a resource to the radio mobile station. Further, communication is performed between the radio base station and the radio mobile station while using the allocated channel (see, for example, Patent Document 1).
JP 2006-270941 A

  In general, effective use of limited frequency resources is desired in wireless communication. In particular, as the communication speed increases, the demand is further increased. One technique for meeting this requirement is the OFDMA (Orthogonal Frequency Division Multiple Access) system, which can be combined with TDMA / TDD. OFDMA is a technique for frequency-multiplexing a plurality of terminal devices using OFDM. In such OFDMA, a subchannel is formed by a plurality of subcarriers, and a multicarrier signal is formed by a plurality of subchannels.

  Further, by combining with TDMA, the multicarrier signal is divided into a plurality of time slots on the time axis. As a result, the base station apparatus performs data communication with the terminal apparatus by assigning the subchannel in at least one time slot to the terminal apparatus. Since there are a plurality of types of data communication contents, there are a plurality of types of data arranged in one subchannel. Generally, different data types require different qualities. For example, audio data used for telephones and video data used for videophones are required to have real-time characteristics. On the other hand, the information data used for file transfer is required to be accurate instead of being required to be real-time. Furthermore, control signals for controlling the above data communication are also arranged in the subchannel as data.

  Under such circumstances, the present inventor has come to recognize the following problems. When the size of the subchannel is defined in advance, the size of data to be transmitted may be smaller than the size of the subchannel. In such a case, if further data can be arranged in the subchannel, the transmission efficiency is improved. However, as described above, since there are a plurality of types of data, there are combinations of data that should not be included in one subchannel.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a communication technique that aggregates at least two types of data while considering the compatibility of the combinations even when multiple types of data exist. There is to do.

  In order to solve the above-described problem, a transmission device according to an aspect of the present invention includes a transmission unit that transmits a packet signal including a payload, and a plurality of payloads included in the packet signal to be transmitted from the transmission unit. And a control unit for determining whether to aggregate the data signals, to aggregate the data signals and the control signal, or not to perform the aggregation. The transmission unit defines the presence / absence of retransmission control and multiple types of retransmission control, and the control unit determines aggregation of multiple data signals if the types of retransmission control match when retransmission control is performed in the transmission unit. Even if the types of retransmission control do not match, the aggregation of the data signal and the control signal is determined.

  Another aspect of the present invention is a communication method. In this method, a step of aggregating a plurality of data signals with respect to a payload included in a packet signal, aggregating a data signal and a control signal, or not performing aggregation, and a payload Transmitting a packet signal including the. The transmitting step defines the presence / absence of retransmission control and a plurality of types of retransmission control, and the determining step determines aggregation of a plurality of data signals if the types of retransmission control match when retransmission control is performed. Even if the types of retransmission control do not match, the aggregation of the data signal and the control signal is determined.

  It should be noted that any combination of the above-described constituent elements and a conversion of the expression of the present invention between a method, an apparatus, a system, a recording medium, a computer program, etc. are also effective as an aspect of the present invention.

  According to the present invention, even when there are a plurality of types of data, at least two types of data can be aggregated while considering the compatibility of the combinations.

  Before describing the present invention specifically, an outline will be given first. Embodiments of the present invention relate to a communication system including a base station device and at least one terminal device. In the communication system, each frame is formed by time-division multiplexing a plurality of time slots, and each time slot is formed by frequency-division multiplexing a plurality of subchannels. Each subchannel is formed by a multicarrier signal. Here, OFDM signals are used as multicarrier signals, and OFDMA is used as frequency division multiplexing. The OFDMA scheme is a technique for frequency multiplexing a plurality of terminal devices using OFDM. The base station apparatus performs communication with the plurality of terminal apparatuses by assigning each of the plurality of subchannels included in each time slot to the terminal apparatus.

  Each of the plurality of subchannels included in each time slot corresponds to a packet signal. In the packet signal, the training signal is arranged at the head portion, the control signal is arranged at the subsequent stage of the training signal, and the data signal is arranged at the subsequent stage of the control signal. Here, the control signal and the data signal arranged in this way are called a “signal symbol” and a “data symbol”, respectively. The data symbol includes a payload, and data is arranged in the payload. As described above, there are a plurality of types of data, and the quality required for each data is generally different. There are various items in the required quality, but in order to clarify the explanation, real-time characteristics are considered here. One of the factors for specifying the real-time property is the presence / absence of retransmission control. The real-time property is also determined by the type of retransmission control. Therefore, the presence / absence of retransmission control and the type of retransmission control are defined in accordance with the real-time property required for each data.

  The size of data to be transmitted may be smaller than the size of the payload. In order to improve the transmission efficiency of the communication system, it is preferable that the size of data included in one payload is large. Therefore, in terms of transmission efficiency of the communication system, it is effective to arrange a plurality of data in one payload (hereinafter, arranging a plurality of data in one payload is called “packing”). At this time, if retransmission control is executed on the entire payload, retransmission control is easily realized even when packing is executed. However, when packing is performed on data having different real-time characteristics, even if a real-time requirement for predetermined data is satisfied, a real-time requirement for other data is not satisfied. As a result, the real-time requirement for the entire communication system cannot be satisfied. In order to cope with this, the communication system according to the present embodiment executes the following processing.

  The base station apparatus determines to perform packing when retransmission control is not executed for each of a plurality of data, or when the type of retransmission control for each of the plurality of data is the same. In addition to the signal symbols described above, there are control signals to be placed in the payload. The control signal can be said to be control information in a higher layer than the signal symbol, and execution of retransmission control is defined in the control signal. When performing retransmission control on data, the base station apparatus determines execution of packing for the data and the control signal regardless of the type of retransmission control between the data and the control signal. If the types of retransmission control are different, the base station apparatus changes the type of retransmission control for the control signal so as to match the type of retransmission control for data.

  FIG. 1 shows a configuration of a communication system 100 according to an embodiment of the present invention. The communication system 100 includes a first terminal device 12a, a second terminal device 12b, and a third terminal device 12c, which are collectively referred to as a base station device 10 and a terminal device 12.

  The base station device 10 has a terminal device 12 connected to one end via a wireless network and a wired network (not shown) connected to the other end. Further, the terminal device 12 is connected to the base station device 10 via a wireless network. The base station apparatus 10 performs communication with the plurality of terminal apparatuses 12 by assigning communication channels to the plurality of terminal apparatuses 12. Specifically, the base station device 10 broadcasts a broadcast signal, and the terminal device 12 recognizes the presence of the base station device 10 by receiving the broadcast signal. Thereafter, the terminal apparatus 12 transmits a channel allocation request signal to the base station apparatus 10, and the base station apparatus 10 allocates a communication channel to the terminal apparatus 12 in response to the received request signal.

  In addition, the base station apparatus 10 transmits information on the communication channel assigned to the terminal apparatus 12, and the terminal apparatus 12 performs communication with the base station apparatus 10 while using the assigned communication channel. As a result, the data transmitted from the terminal device 12 is output to the wired network via the base station device 10 and finally received by a communication device (not shown) connected to the wired network. Data is also transmitted in the direction from the communication device to the terminal device 12. 1 shows one base station apparatus 10, the communication system 100 may include a plurality of base station apparatuses 10, and the terminal apparatus 12 communicates with one of the base station apparatuses 10. If a channel is assigned, communication can be executed.

  In the above description, the communication channel is specified by the combination of the subchannel and the time slot described above. In addition, since the base station apparatus 10 has a plurality of time slots and a plurality of subchannels, the base station apparatus 10 executes OFDMA using a plurality of subchannels while executing TDMA using the plurality of time slots.

  2A to 2C show a frame configuration in the communication system 100. FIG. The horizontal direction in the figure corresponds to the time axis. A frame is formed by time multiplexing of eight time slots. The eight time slots are composed of four downstream time slots and four upstream time slots. Here, four uplink time slots are indicated as “first uplink time slot” to “fourth uplink time slot”, and four downlink time slots are indicated as “first downlink time slot” to “fourth downlink time slot”. . Further, the illustrated frame is repeated continuously.

  The configuration of the frame is not limited to that shown in FIG. 2A. For example, the frame configuration may be configured by four time slots or 16 time slots. The configuration will be described with reference to FIG. For the sake of brevity, it is assumed that the upstream time slot and the downstream time slot have the same configuration. For this reason, only one of the uplink time slot and the downlink time slot may be described, but the same description is valid for the other time slot. Furthermore, a super frame is formed by continuing a plurality of frames shown in FIG. Here, as an example, it is assumed that a super frame is formed by “20” frames.

  FIG. 2B shows the configuration of one time slot in FIG. The vertical direction in the figure corresponds to the frequency axis. As illustrated, one time slot is formed by frequency multiplexing of “16” subchannels from “first subchannel” to “16th subchannel”. In addition, the plurality of subchannels are frequency division multiplexed. Since each time slot is configured as shown in FIG. 2B, the above-described communication channel is specified by the combination of the time slot and the subchannel. Also, the frame configuration corresponding to one subchannel in FIG. 2B may be as shown in FIG. Note that the number of subchannels arranged in one time slot may not be “16”. Here, it is assumed that the allocation of the subchannel in the uplink time slot and the allocation of the subchannel in the downlink time slot are the same. Further, it is assumed that at least one notification signal is assigned in units of superframes. For example, a broadcast signal is allocated to one subchannel in one time slot among a plurality of downlink time slots included in the superframe.

  FIG. 2 (c) shows the configuration of one subchannel of FIG. 2 (b), and FIG. 2 (c) corresponds to the aforementioned packet signal. Similar to FIG. 2A and FIG. 2B, the horizontal direction in the figure corresponds to the time axis, and the vertical direction in the figure corresponds to the frequency axis. Further, numbers “1” to “29” are assigned to the frequency axis, and these indicate subcarrier numbers. In this way, the subchannel is composed of multicarrier signals, and in particular is composed of OFDM signals. “TS” in the figure corresponds to a training symbol and is constituted by a known value. “SS” corresponds to a signal symbol. “GS” corresponds to a guard symbol, and no substantial signal is arranged here. “PS” corresponds to a pilot symbol, and is configured by a known value. “DS” corresponds to a data symbol and is data to be transmitted. “GT” corresponds to a guard time, and no substantial signal is arranged here.

  FIG. 3 shows an arrangement of subchannels in the communication system 100. In FIG. 3, the frequency axis is shown on the horizontal axis, and the spectrum for the time slot shown in FIG. 2B is shown. As described above, 16 subchannels from the first subchannel to the 16th subchannel are frequency division multiplexed in one time slot. Each subchannel is configured by a multicarrier signal, here, an OFDM signal.

  The operation of the communication system 100 configured as above will be described. FIG. 4 is a sequence diagram illustrating a communication procedure in the communication system 100. The location registration is completed between the terminal device 12 and the base station device 10 (S10). The user performs a call operation on the terminal device 12 (S12). The terminal device 12 transmits a radio resource acquisition request SCCH to the base station device 10 (S14). The radio resource acquisition request SCCH includes a MAC protocol type, an upper layer protocol type, and the like. The base station apparatus 10 transmits radio resource allocation SCCH to the terminal apparatus 12 (S16). The radio resource allocation SCCH includes a slot number, an OFDMA channel number, a service flow ID, and the like. Here, the slot number corresponds to a time slot number, and the OFDMA channel number corresponds to a subchannel number. The service flow ID is an ID assigned to specify a service flow between the base station device 10 and the terminal device 12, and has the same value from the start of the service flow to the end of the service flow.

  TCH synchronization is performed between the terminal apparatus 12 and the base station apparatus 10 (S18). Specifically, the terminal device 12 transmits a TCH idle burst to the base station device 10 in the assigned subchannel. Base station apparatus 10 determines synchronization establishment according to the reception result of the TCH idle burst. The base station device 10 transmits an authentication request FACCH to the terminal device 12 (S20). The authentication request FACCH includes an authentication random number content length, an authentication random number, an authentication type, a key generation random number content length, a key generation random number, and the like. The terminal device 12 transmits an authentication response FACCH to the base station device 10 (S22). The authentication response FACCH includes an authentication calculation result content length, an authentication calculation result, and the like. The terminal device 12 transmits a service flow change request FACCH to the base station device 10 (S24). The service flow change request FACCH includes a service flow ID, retransmission control type, ARQ control IE, HARQ control IE, and the like. Here, the retransmission control type is specified when the presence / absence of retransmission control processing and the retransmission control procedure are changed. Also, according to the retransmission control type, any of ARQ-free, sequential transfer ARQ, random transfer ARQ, and HARQ is designated.

  The ARQ control IE is information that exists when the retransmission control type is ARQ for sequential transfer or ARQ for random transfer. Also, the ARQ control IE includes, for example, information on ARQ window size, ARQ retransmission timeout, and block lifetime. The ARQ window size is specified when changing the window size in ARQ retransmission control. The ARQ retransmission timeout is specified when changing the retransmission time of a transmission block in ARQ retransmission control. Furthermore, the block lifetime is specified when changing the lifetime (ACK reception waiting time) of a transmission block in ARQ retransmission control. The HARQ control IE is information that exists when the retransmission control type is HARQ. Further, the HARQ control IE includes, for example, each information of the HARQ scheme, the maximum number of HARQ SNs, and the number of retries. In the HARQ scheme, the HARQ scheme is designated. Also, the maximum number of HARQ SNs specifies the maximum number of HARQ sequence numbers. Further, the number of retries specifies the number of HARQ retries.

  The base station apparatus 10 transmits a service flow change response FACCH to the terminal apparatus 12 (S26). The service flow change response FACCH includes a service flow ID, a processing result, and the like. That is, the presence / absence of ARQ and the type of ARQ are specified by the combination of the service flow change request FACCH and the service flow change response FACCH. The terminal device 12 transmits a packet signal to the base station device 10 (S28), and the base station device 10 transmits a packet signal to the wired network (S30). The base station device 10 receives a packet signal from the wired network (S32), and the base station device 10 transmits the packet signal to the terminal device 12 (S34).

  FIG. 5 shows the configuration of the base station apparatus 10. The base station apparatus 10 includes a first RF unit 20a, a second RF unit 20b, an NRF unit 20n, a baseband processing unit 22, a modem unit 24, an IF unit 26, a radio control unit 28, and a storage unit 30. including. The radio control unit 28 includes a control channel determination unit 32 and a radio resource allocation unit 38.

  As a reception process, the RF unit 20 performs frequency conversion on a radio frequency multicarrier signal received from a terminal device 12 (not shown) to generate a baseband multicarrier signal. Here, the multicarrier signal is formed as shown in FIG. 3, and corresponds to the uplink time slot of FIG. Further, the RF unit 20 outputs a baseband multicarrier signal to the baseband processing unit 22. In general, a baseband multicarrier signal is formed by an in-phase component and a quadrature component, and therefore should be transmitted by two signal lines. For the sake of clarity, a single signal line is used here. Only. The RF unit 20 also includes an AGC and an A / D conversion unit.

  As a transmission process, the RF unit 20 performs frequency conversion on the baseband multicarrier signal input from the baseband processing unit 22 to generate a radiofrequency multicarrier signal. Further, the RF unit 20 transmits a radio frequency multicarrier signal. The RF unit 20 transmits a multicarrier signal while using the same radio frequency band as the received multicarrier signal. That is, as shown in FIG. 2A, TDD (Time Division Duplex) is used. The RF unit 20 also includes a PA (Power Amplifier) and a D / A conversion unit.

  The baseband processing unit 22 inputs a baseband multicarrier signal from each of the plurality of RF units 20 as a reception operation. Since the baseband multi-carrier signal is a time domain signal, the baseband processing unit 22 converts the time domain signal to the frequency domain by FFT and performs adaptive array signal processing on the frequency domain signal. To do. Further, the baseband processing unit 22 executes timing synchronization, that is, FFT window setting, and also deletes the guard interval. Since a known technique may be used for timing synchronization and the like, description thereof is omitted here. The baseband processing unit 22 outputs the result of adaptive array signal processing to the modem unit 24. As a transmission operation, the baseband processing unit 22 receives a multi-carrier signal in the frequency domain from the modulation / demodulation unit 24 and performs dispersion processing using weight vectors.

  As a transmission operation, the baseband processing unit 22 converts the frequency domain signal to the time domain by IFFT on the frequency domain multicarrier signal input from the modem unit 24, and converts the converted time domain signal to the RF unit. 20 output. The baseband processing unit 22 also adds a guard interval, but the description is omitted here. Here, the frequency domain signal includes a plurality of subchannels as shown in FIG. 2B, and each of the subchannels includes a plurality of subcarriers as in the vertical direction of FIG. 2C. For the sake of clarity, it is assumed that the signals in the frequency domain are arranged in the order of subcarrier numbers to form a serial signal.

  The modem unit 24 performs demodulation on the multi-carrier signal in the frequency domain from the baseband processing unit 22 as reception processing. The multicarrier signal converted into the frequency domain has components corresponding to each of the plurality of subcarriers as shown in FIGS. Demodulation is performed in units of subcarriers. The modem unit 24 outputs the demodulated signal to the IF unit 26. Further, the modem unit 24 performs modulation as transmission processing. The modem unit 24 outputs the modulated signal to the baseband processing unit 22 as a multi-carrier signal in the frequency domain.

  The IF unit 26 receives the demodulation result from the modulation / demodulation unit 24 as a reception process, and separates the demodulation result for each terminal device 12. That is, the demodulation result is composed of a plurality of subchannels as shown in FIG. Therefore, when one subchannel is assigned to one terminal apparatus 12, the demodulation result includes signals from a plurality of terminal apparatuses 12. The IF unit 26 separates such a demodulation result for each terminal device 12. The IF unit 26 outputs the separated demodulation result to a wired network (not shown). At that time, the IF unit 26 performs transmission according to information for identifying the destination, for example, an IP (Internet Protocol) address.

  Further, the IF unit 26 inputs data for the plurality of terminal devices 12 from a wired network (not shown) as a transmission process. The IF unit 26 assigns data to subchannels and forms a multicarrier signal from a plurality of subchannels. That is, the IF unit 26 forms a multicarrier signal composed of a plurality of subchannels as shown in FIG. The subchannel to which data is to be assigned is determined in advance as shown in FIG. 2 (c), and an instruction related thereto is received from the radio control unit 28. The IF unit 26 outputs the multicarrier signal to the modem unit 24.

  The radio control unit 28 controls the operation of the base station device 10. The radio control unit 28 defines time slots formed by frequency multiplexing of a plurality of subchannels and frames formed by time multiplexing of a plurality of time slots, as shown in FIGS. . Further, the radio control unit 28 instructs the modulation / demodulation unit 24 and the like to form a packet signal and executes retransmission control. Here, the function of the wireless control unit 28 will be described in the following order. First, (1) communication channel allocation by the radio resource allocation unit 38 and the control channel determination unit 32 will be described. Next, (2) retransmission control with a communication channel assigned will be described. Next, (3) the configuration of a packet signal including information necessary for retransmission control will be described. Further, (4) packing processing executed while considering retransmission control and a packet signal configuration will be described.

(1) Allocation of communication channel The radio control unit 28 broadcasts a broadcast signal from the modem unit 24 via the RF unit 20. Here, the broadcast signal includes information about its own identification number and the number of empty subchannels. The broadcast signal is assigned to a subchannel determined by a control channel determination unit 32 described later. The radio resource allocation unit 38 receives a subchannel allocation request from the terminal device 12 (not shown) from the RF unit 20 via the modem unit 24. The subchannel allocation request corresponds to the above-described radio resource acquisition request SCCH.

  The radio resource allocation unit 38 allocates a subchannel to the terminal device 12 that has received the allocation request. Here, the radio resource assignment unit 38 assigns the subchannels included in the uplink time slot and the downlink time slot to the terminal device 12. In particular, the subchannel allocation in the uplink time slot and the subchannel allocation in the downlink time slot are made symmetrical. Note that the radio resource allocation unit 38 refers to information such as the MAC protocol type and the upper layer protocol type included in the radio resource acquisition request SCCH at the time of subchannel allocation, but details thereof are omitted here. Further, the radio resource allocation unit 38 transmits an allocation notification from the modem unit 24 to the terminal device 12 via the RF unit 20. The allocation notification corresponds to the above-described radio resource allocation SCCH. The assignment notification includes information on the assigned subchannel and time slot. After the above processing is performed, the wireless control unit 28 causes the RF unit 20 to cause the modem unit 24 to perform communication with the terminal device 12 to which the subchannel is assigned.

  The control channel determination unit 32 assigns the broadcast signal to the subchannel. Here, the notification signal is a signal including information used for controlling communication with the terminal device 12 as described above. It can be said that the importance of such a notification signal is higher than that of a packet signal including data. The control channel determination unit 32 selects a predetermined subchannel while referring to the storage unit 30. In addition, the control channel determination unit 32 notifies the radio resource allocation unit 38 of the selected subchannel. The radio resource allocation unit 38 allocates a subchannel to the broadcast signal according to the notification from the control channel determination unit 32. The storage unit 30 stores information on subchannels assigned to the terminal device 12 and information on control channels in cooperation with the radio control unit 28.

(2) Retransmission Control The radio control unit 28 defines the presence / absence of retransmission control and multiple types of retransmission control from the RF unit 20 to the IF unit 26. The presence / absence of retransmission control refers to whether or not to perform retransmission control. The multiple types of retransmission control are specific means for realizing retransmission control. Here, the types of retransmission control are classified into ARQ and HARQ. Furthermore, ARQ is classified into sequential transfer and random transfer. Sequential transfer includes stop-and-wait-ARQ and go-back-N-ARQ, and random transfer corresponds to selective retransmission ARQ. In the following, description will be made in the order of stop-and-wait-ARQ, go-back-N-ARQ, selective retransmission ARQ, and HARQ.

  First, stop-and-wait-ARQ is a method in which the transmission side transmits packet signals one by one. If the transmission side has not received ACK from the reception side, the transmission side retransmits the same packet signal. In stop-and-wait ARQ, the ARQ window size is 1. Here, description will be made assuming that the base station apparatus 10 is the transmission side. FIG. 6 shows an overview of stop-and-wait-ARQ controlled by the radio control unit 28. An upper part of FIG. 6 shows a time chart corresponding to the transmission / reception operation in the base station apparatus 10, and a lower part of FIG. 6 shows a time chart corresponding to the transmission / reception operation in the terminal apparatus 12. Here, a packet signal including data is assumed to be transmitted in the downlink direction. In FIG. 6, the above-described frames are shown as “F1” to “F11”. Actually, the base station apparatus 10 uses one time slot of one frame to transmit a packet signal to the terminal apparatus 12, but here, without distinguishing the time slot, , Simply shown as frame F.

  Here, the ARQ retransmission timeout period is 3 frames. The base station apparatus 10 transmits a packet signal to which a sequence number is added. Although details will be described later, one packet signal includes one PDU, and a sequence number is added to the PDU. Moreover, the base station apparatus 10 does not transmit the next PDU until it receives the ACK of the transmitted PDU. Furthermore, the base station apparatus 10 assigns sequence numbers in order from “0”. In FIG. 6, in F1, the base station apparatus 10 transmits a PDU having a sequence number “0”, and the terminal apparatus 12 receives the PDU. In F2, the terminal apparatus 12 transmits an ACK for the received PDU, and the base station apparatus 10 receives the ACK. Here, if the base station apparatus 10 can receive the ACK, the base station apparatus 10 considers that the PDU before the sequence number corresponding to the received ACK has been successfully transmitted. Thereafter, in F4, the base station apparatus 10 transmits the PDU having the sequence number “1”. Since the PDU is not received by the terminal device 12, the ACK for the PDU is not transmitted from the terminal device 12. As a result, an ARQ retransmission timeout occurs at F6. At that time, the base station apparatus 10 retransmits the PDU having the sequence number “1” in F7. Note that the base station apparatus 10 discards the PDU and transmits the next PDU when the block lifetime has elapsed since the first transmission of the ACK unreceived PDU.

  In order to realize ARQ, the base station apparatus 10 adds a sequence number to an SN field of a MAC header described later at the time of PDU transmission. The sequence number is managed in units of service flows, and there is no influence on other service flows. In order to transmit ACK in ARQ for received data, the terminal device 12 uses a downlink time slot and a pair of uplink time slots. The terminal device 12 stores the sequence number that has been successfully received as an ARQ ACK in the ACK SN field in the MAC header.

  Next, go-back-N-ARQ is a method in which the transmitting side continuously transmits PDUs. If the transmitting side has not received an ACK from the receiving side, the transmitting side retransmits a packet signal subsequent to the packet signal corresponding to the ACK. FIG. 7 shows an outline of go-back-N-ARQ controlled by the radio control unit 28. Here, the ARQ window size is 3, and the ARQ retransmission timeout period is 3 frames. The base station apparatus 10 transmits the PDU with the sequence number added, as in FIG. In addition, the base station apparatus 10 continuously transmits the next PDU without receiving an ACK of the transmitted PDU as long as it is within the ARQ window size. Furthermore, the base station apparatus 10 assigns sequence numbers in order from “0”. In FIG. 7, in F1, the base station apparatus 10 transmits a PDU having a sequence number “0”, and the terminal apparatus 12 receives the PDU. Further, in F2, the base station apparatus 10 transmits the PDU having the sequence number “1” even if the ACK for the PDU having the sequence number “0” has not been received. Further, the base station apparatus 10 also transmits the PDU having the sequence number “2” in F3.

  On the other hand, the terminal apparatus 12 receives PDUs having sequence numbers “0” to “2” in F1 to F3, and transmits ACKs for the respective PDUs in F2 to F4. Here, if the base station apparatus 10 can receive the ACK, the base station apparatus 10 considers that the PDU before the sequence number corresponding to the received ACK has been successfully transmitted. Thereafter, in F4, the base station apparatus 10 transmits the PDU with the sequence number “3”. Since the PDU is not received by the terminal device 12, the ACK for the PDU is not transmitted from the terminal device 12. However, base station apparatus 10 transmits PDUs with sequence numbers “4” and “5” in F5 and F6. In F6, an ARQ retransmission timeout occurs. At that time, the base station apparatus 10 retransmits the PDU with the sequence number “3” in F7. That is, when an ARQ retransmission timeout occurs, the base station apparatus 10 retransmits all PDUs transmitted after the PDU that has not received an ACK. Furthermore, the base station device 10 and the terminal device 12 repeatedly execute similar processing. Note that the base station apparatus 10 discards the PDU and transmits the next PDU when the block lifetime has elapsed since the first transmission of the ACK unreceived PDU.

  Next, selective retransmission ARQ is a method in which the transmission side continuously transmits PDUs. If the transmission side has not received ACK from the reception side, the transmission side retransmits the packet signal corresponding to the ACK. FIG. 8 shows an outline of selective retransmission ARQ controlled by the radio control unit 28. Here, the ARQ window size is 3, and the ARQ retransmission timeout period is 3 frames. The base station apparatus 10 transmits the PDU with the sequence number added, as in FIG. Further, the base station apparatus 10 continuously transmits the next PDU without receiving the ACK of the transmitted PDU, if it is within the PDU window size. In addition, the base station apparatus 10 assigns sequence numbers in order from “0”. In FIG. 8, in F1, the base station apparatus 10 transmits a PDU having a sequence number “0”, and the terminal apparatus 12 receives the PDU. Further, in F2, the base station apparatus 10 transmits the PDU having the sequence number “1” even if the ACK for the PDU having the sequence number “0” has not been received. Further, the base station apparatus 10 also transmits the PDU having the sequence number “2” in F3.

  On the other hand, the terminal apparatus 12 receives PDUs having sequence numbers “0” to “2” in F1 to F3, and transmits ACKs for the respective PDUs in F2 to F4. Here, if the base station apparatus 10 can receive the ACK, the base station apparatus 10 considers that the PDU having the sequence number corresponding to the received ACK has been successfully transmitted. Thereafter, in F4, the base station apparatus 10 transmits the PDU with the sequence number “3”. Since the PDU is not received by the terminal device 12, the ACK for the PDU is not transmitted from the terminal device 12. However, base station apparatus 10 transmits PDUs with sequence numbers “4” and “5” in F5 and F6. In F6, an ARQ retransmission timeout for the PDU with the sequence number “3” occurs. At that time, the base station apparatus 10 retransmits the PDU with the sequence number “3” in F7. That is, when an ARQ retransmission timeout occurs, the base station apparatus 10 retransmits a PDU that has not been received. Furthermore, the base station device 10 and the terminal device 12 repeatedly execute similar processing. Note that the base station apparatus 10 discards the PDU and transmits the next PDU when the block lifetime has elapsed since the first transmission of the ACK unreceived PDU.

  HARQ is a retransmission scheme that improves the packet error correction rate by combining FEC and retransmission control. Here, IR (Incremental Redundancy) HARQ is used as HARQ. IR HARQ is a method for improving an error correction rate using a punctured pattern. When error correction fails, the transmission side transmits data of only the first puncture part. At this time, since the amount of transmission data decreases, transmission is performed with the modulation scheme lowered. The receiving side can improve the error correction rate by complementing the puncture with the initial transmission data. For discrimination between punctured encoded data and punctured pattern data, and ACK / NACK, parameters are stored in signal symbols.

  FIGS. 9A to 9I show an overview of HARQ controlled by the radio control unit 28 of FIG. FIG. 9A shows user data transmitted from the base station apparatus 10 for the first time. Here, the user data is “A0” to “A8”. FIG. 9B shows the result of FEC encoding. Here, by performing convolutional coding at a coding rate R = 1/2, encoded data of “X8” and “Y8” is generated from “X0” and “Y0”. FIG. 9C shows the result of punctured encoding for the encoded data of FIG. 9B. FIG. 9D shows transmission data from the base station apparatus 10. As shown in the figure, the results of the punctured encoding shown in FIG. 9C are serially arranged. FIG. 9E shows the result of performing punctured decoding on the result received by the terminal device 12. Here, if there is no error in the result of executing punctured decoding, the terminal device 12 reproduces user data by executing Viterbi decoding. On the other hand, if there is an error in the result of executing the punctured decoding, the terminal apparatus 12 transmits a NACK to the base station apparatus 10.

  FIG. 9F shows data of the puncture portion of the punctured pattern corresponding to FIG. When receiving the NACK from the terminal device 12, the base station device 10 extracts the punctured data. FIG. 9G shows transmission data at the time of retransmission from the base station apparatus 10. As shown in the figure, the data of the punctured portion shown in FIG. 9 (f) is transmitted. FIG. 9H shows data of the punctured part received by the terminal device 12. FIG. 9 (i) shows the result of puncture interpolation by IR method. The terminal device 12 performs decoding on the result shown in FIG. 9 (i) and reproduces user data. In addition, if the base station apparatus 10 receives NACK after transmitting the punctured pattern, the base station apparatus 10 retransmits the PDU that has been punctured encoded. In addition, if neither NACK nor ACK can be received from the terminal device 12, the base station device 10 retransmits the punctured encoded PDU.

  Base station apparatus 10. When executing HARQ, a sequence number is added as in the case of executing ARQ. However, the sequence number in HARQ is not included in the MAC header but is included in the data symbol. In order to transmit HARQ ACK for received data, the terminal apparatus 12 uses a downlink time slot and a pair of uplink time slots.

(3) Configuration of Packet Signal FIGS. 10A to 10D show the configuration of signal symbols generated in the radio control unit 28 of FIG. Here, FIG. 10A corresponds to an uplink signal symbol, and FIG. 10B corresponds to a downlink signal symbol. Therefore, FIG. 10A is generated in the terminal device 12. MI indicates a modulation parameter notification, and MR indicates a modulation parameter request. PC indicates a transmission output control request, and TC indicates a time alignment control request. The HC is set on the transmission side when HARQ retransmission control is performed, and the HA is responded on the reception side when HARQ retransmission control is performed. The ED is used for signal symbol error detection.

  FIG. 10C shows the configuration of the HC field. As shown in the figure, HC is 4-bit data, and includes retransmission presence / absence, puncture type, and HARQ SN. The retransmission type indicates whether or not to perform HARQ retransmission. The puncture type indicates the punctured type of transmission data, and indicates punctured encoded data or punctured data. HARQ SN indicates the sequence number of HARQ. FIG. 10D shows the configuration of the HA field. As shown in the figure, HA is 4-bit data, and includes ACK presence / absence, ACK type, and HARQ ACK SN. The presence or absence of ACK indicates whether or not there is HARQ ACK. The ACK type indicates the type of HARQ ACK and indicates ACK or NACK. HARQ ACK SN indicates the sequence number of HARQ ACK.

  FIGS. 11A and 11B show the configuration of data symbols generated in the radio control unit 28 of FIG. In FIG. 11A, the CI bit for identifying the channel type is set at the head portion of the data symbol. Following the CI, a MAC header and a payload are arranged. Note that the combination of the MAC header and the payload corresponds to the PDU described above. Also, a 16-bit CRC and a tail bit are set in the rear part of the data symbol. Here, Tail bit is additional bit data required at the time of decoding for error correction. The data symbol is modulated by a modulation scheme designated by the MI of the signal symbol.

  FIG. 11B shows the structure of the MAC header. “PF” is a flag indicating the packing state of the payload. The packing will be described later. If PF is 0, the payload data is not packed, and if PF is 1, the payload data is packed. “FF” is a flag indicating the fragment state of the payload. A fragment is a process of dividing data when transmitting data having a size larger than the size of the payload. Here, detailed description of the fragment processing is omitted. If FF is 0, the payload data is not fragmented. If FF is 1, the payload data is fragmented.

  “AF” is a flag for indicating whether the SN field for ARQ is valid or invalid. If valid, the SN field is present in the MAC header. “AAF” is a flag indicating whether the ACK SN field for ARQ ACK is valid or invalid. If valid, there is an ACK SN field in the MAC header. “NR” is an ARQ reception impossible flag, and is used for the reception side to notify the transmission side of the stop / resumption of retransmission control. “Len” represents the length of the data part in the frame format in one subchannel in bytes. “SN” is a sequence number and indicates a value incremented (mod 256) for each service flow. “SN” is an option field that exists only when AF is enabled. “ACK SN” is a field for storing an ARQ result, and indicates a sequence number of ARQ ACK. In addition, “ACK SN” is a value incremented (mod 256) for each PDU, and indicates a sequence number that can be normally received. Note that “SN” is an option field that exists only when AF is enabled.

(4) Packing process As described above, the IF unit 26 receives data to be transmitted from a wired network (not shown). On the other hand, the modem unit 24 to the RF unit 20 transmit a packet signal including a payload. Here, the radio control unit 28 compares the size of data to be transmitted with the size of data that can be arranged in the payload. When the former size is smaller than the latter size, the wireless control unit 28 aggregates a plurality of data, aggregates data and control signals, and aggregates the payload included in the packet signal. Decide which one to not. Here, the control signal indicates not a control signal to be transmitted with a signal symbol but a control signal to be transmitted with a data symbol. As a premise, execution of retransmission control is defined for the control signal, and one of the above-described selective retransmission ARQ and the like is defined as the type of retransmission control. On the other hand, the presence / absence of retransmission control and the type of retransmission control for data are appropriately changed in the aforementioned service flow change request FACCH, service flow change response FACCH, and the like.

  Regardless of whether the aggregation target is a plurality of data or a combination of data and a control signal, one of the radio control units 28 has no retransmission control and the rest has retransmission control. , Decide not to perform aggregation. That is, when the presence / absence of retransmission control is different, the radio control unit 28 determines not to perform aggregation. On the other hand, when the aggregation target is a plurality of data, the radio control unit 28 determines aggregation of the plurality of data if none of the plurality of data has retransmission control. Further, when the aggregation target is a plurality of data, the radio control unit 28 confirms the type of retransmission control if the plurality of data are all subjected to retransmission control. Here, the type of retransmission control corresponds to selective retransmission ARQ or the like. Furthermore, even if the same selective retransmission ARQ or the like is used, different types of retransmission control may be used as long as parameters such as ARQ windows defined for the same are different. If the types of retransmission control match, the radio control unit 28 determines aggregation of a plurality of data signals.

  When the aggregation target is a combination of data and a control signal, the radio control unit 28 determines not to perform aggregation if the data is not subjected to retransmission control. On the other hand, if the data has retransmission control, the radio control unit 28 determines aggregation of the data signal and the control signal even if the types of retransmission control do not match. At this time, if the type of retransmission control does not match, the radio control unit 28 changes the type of retransmission control for the control signal so as to match the type of retransmission control for the data signal. For example, if the retransmission control for data is HARQ and the retransmission control for the control signal is selective retransmission ARQ, the radio control unit 28 changes the retransmission control for the control signal to HARQ. Even if the retransmission control for data and the retransmission control for the control signal are the same, if the value of the ARQ window is different, the radio control unit 28 changes the value of the ARQ window for the retransmission control for the control signal.

  As described above, the wireless control unit 28 assigns a sequence number to the payload. For example, the radio control unit 28 includes a sequence number in the MAC header when executing ARQ, and includes a sequence number in the signal symbol when executing HARQ. Here, even when the aggregation in the payload is determined, the radio control unit 28 assigns a sequence number to the payload as in the case where the aggregation is not performed. That is, sequence numbers are assigned to a plurality of aggregated data signals or combinations of data signals and control signals.

  12A to 12C show the configuration of data symbols generated in the radio control unit 28 of FIG. FIGS. 12A to 12B show the configuration of data symbols when no packing is performed. In either case, the payload is formed by one SDU. Here, the SDU corresponds to the aforementioned data. FIG. 12A shows a format when ARQ is not executed, and FIG. 12B shows a format when ARQ is executed. When both are compared, the presence or absence of SN in the MAC header is different. FIG. 12C shows data symbols when packing is performed. Note that ARQ is not executed. As illustrated, a plurality of SDUs are arranged in the payload. Note that a PSH is arranged in front of each SDU. PSH is a subheader added when packing is performed, and includes the data length of the subsequent SDU as Len as shown in the figure.

  This configuration can be realized in terms of hardware by a CPU, memory, or other LSI of any computer, and in terms of software, it is realized by a program having a communication function loaded in the memory. Describes functional blocks realized by collaboration. Accordingly, those skilled in the art will understand that these functional blocks can be realized in various forms by hardware only, software only, or a combination thereof.

  An operation of the base station apparatus 10 having the above configuration will be described. FIG. 13 is a flowchart illustrating a packing processing procedure in the wireless control unit 28. If packing is possible from the size of the SDU (Y in S50), that is, if the size of the SDU is smaller than the size of the payload, if the combination of data and control signal (Y in S52), the radio control unit 28 Confirm whether ARQ exists for the data. ARQ here is a concept including HARQ. When ARQ is defined for the data signal (Y in S54), if the ARQ is not the same type (N in S56), the radio control unit 28 changes the ARQ defined for the control signal. (S58). On the other hand, if they are the same type of ARQ (Y in S56), the radio control unit 28 skips the process of step 58. Thereafter, the wireless control unit 28 determines the execution of packing (S60). If ARQ is not defined for the data signal (N in S54), the radio control unit 28 determines not to perform packing, and ends the process.

  If the combination is not a combination of data and a control signal (N in S52), that is, a combination of a plurality of data, the radio control unit 28 confirms whether or not ARQ exists for the plurality of data. When the ARQ presence / absence matches (Y in S62) and the ARQ type matches in the presence of ARQ (Y in S64), the radio control unit 28 determines execution of packing (S66). Also, when the presence or absence of ARQ for a plurality of data matches that there is no ARQ, the radio control unit 28 determines the execution of packing. On the other hand, if the presence / absence of ARQ does not match (N in S62), or the type of ARQ does not match in the presence of ARQ (N in S64), the radio control unit 28 determines not to perform packing and performs processing. finish. If packing is not possible due to the size of the SDU (N in S50), the radio control unit 28 determines not to perform packing and ends the process.

  According to the embodiment of the present invention, when retransmission control is performed on a plurality of data, aggregation is executed if the types of retransmission control match, so even if the data is aggregated, retransmission is performed in the same manner as data that is not aggregated. Control can be executed and processing complexity can be reduced. Also, when performing retransmission control for a plurality of data, aggregation is executed if the types of retransmission control match, so even if there are multiple types of data, at least while considering the compatibility of the combinations Two data can be aggregated. In addition, since a plurality of data is aggregated, transmission efficiency can be improved. Also, if the presence / absence of retransmission control matches, data and control signals are aggregated even if the type of retransmission control does not match, so that transmission efficiency can be improved.

  Further, when the types of retransmission control do not match, the type of retransmission control for the control signal is matched with the type of retransmission control for data, so the types of retransmission control for both can be matched. Also, since the types of retransmission control are the same, retransmission control can be executed in the same way as data that is not aggregated, and processing complexity can be reduced. Moreover, even if the type of retransmission control for the control signal changes, retransmission control can be executed, so that deterioration of the quality for the control signal can be suppressed. Moreover, even if it aggregates, since a sequence number is provided with respect to the whole payload, the increase in information can be suppressed. Further, since the sequence number is assigned to the entire payload, retransmission control can be executed even for aggregated data in the same manner as data that is not aggregated.

  In the above, this invention was demonstrated based on the Example. This embodiment is an exemplification, and it will be understood by those skilled in the art that various modifications can be made to the combination of each component and each processing process, and such modifications are also within the scope of the present invention. .

It is a figure which shows the structure of the communication system which concerns on the Example of this invention. It is a figure which shows the frame structure in the communication system of FIG. It is a figure which shows the frame structure in the communication system of FIG. It is a figure which shows the frame structure in the communication system of FIG. It is a figure which shows arrangement | positioning of the subchannel in the communication system of FIG. It is a sequence diagram which shows the communication procedure in the communication system of FIG. It is a figure which shows the structure of the base station apparatus of FIG. It is a figure which shows the outline | summary of the stop and weight ARQ controlled in the radio | wireless control part of FIG. It is a figure which shows the outline | summary of go-back * N * ARQ controlled in the radio control part of FIG. FIG. 6 is a diagram showing an outline of selective retransmission ARQ controlled by a radio control unit in FIG. FIGS. 9A to 9I are diagrams illustrating an outline of HARQ controlled by the radio control unit in FIG. FIGS. 10A to 10D are diagrams showing the configuration of signal symbols generated in the radio control unit of FIG. FIGS. 11A and 11B are diagrams illustrating the configuration of data symbols generated in the radio control unit of FIG. 12A to 12C are diagrams illustrating the configuration of data symbols generated in the radio control unit in FIG. It is a flowchart which shows the process sequence of the packing in the radio | wireless control part of FIG.

Explanation of symbols

  10 base station device, 12 terminal device, 20 RF unit, 22 baseband processing unit, 24 modulation / demodulation unit, 26 IF unit, 28 radio control unit, 30 storage unit, 32 control channel determination unit, 38 radio resource allocation unit, 100 communication system.

Claims (5)

  1. A transmitter for transmitting a packet signal including a payload;
    Control for determining whether to aggregate a plurality of data signals, to aggregate data signals and control signals, or not to aggregate the payload included in the packet signal to be transmitted from the transmission unit With
    The transmission unit defines the presence / absence of retransmission control and a plurality of types of retransmission control,
    When retransmission control is performed in the transmission unit, the control unit determines aggregation of a plurality of data signals if the types of retransmission control match, and even if the types of retransmission control do not match, A transmission apparatus characterized by determining aggregation with a control signal.
  2.   When determining that the data signal and the control signal are aggregated, if the type of retransmission control does not match, the control unit sets the type of retransmission control for the control signal so as to match the type of retransmission control for the data signal. The transmission apparatus according to claim 1, wherein the transmission apparatus is changed.
  3.   3. The transmission device according to claim 1, wherein the transmission unit performs retransmission control by assigning a sequence number to a payload when the control unit determines aggregation. 4.
  4. Determining one of aggregating a plurality of data signals, aggregating the data signals and control signals, and not performing aggregation for the payload included in the packet signal;
    Transmitting a packet signal including a payload, and
    The step of transmitting defines the presence / absence of retransmission control and a plurality of types of retransmission control,
    In the case where retransmission control is performed, if the type of retransmission control matches, the determining step determines aggregation of a plurality of data signals, and even if the types of retransmission control do not match, the data signal and the control signal A communication method characterized by determining the aggregation of.
  5. Determining one of aggregating a plurality of data signals, aggregating the data signals and control signals, and not performing aggregation for the payload included in the packet signal;
    Transmitting a packet signal including a payload, and
    The step of transmitting defines the presence / absence of retransmission control and a plurality of types of retransmission control,
    In the case where retransmission control is performed, if the type of retransmission control matches, the determining step determines aggregation of a plurality of data signals, and even if the types of retransmission control do not match, the data signal and the control signal A program that causes a computer to determine the aggregation of data.
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