JP5051457B2 - Radio base station apparatus, radio communication method, and program - Google Patents

Description

  The present invention relates to a radio base station apparatus, a radio communication method, and a program that perform scheduling of each of the plurality of radio terminals when user data is transmitted from each of the plurality of radio terminals to the radio base station apparatus.

  In recent years, an HSUPA (High Speed Uplink Packet Access) system defined in 3GPP (3rd Generation Partnership Project) for the purpose of speeding up an uplink from a radio terminal (mobile terminal) to a radio base station apparatus (Node-B) has been developed. It is spreading (see, for example, Patent Documents 1 to 3). In this HSUPA scheme, the transmission rate of the uplink is increased and the throughput is increased by using E-DCH (Enhanced Dedicated Channel) individually assigned to each of a plurality of wireless terminals. In the HSUPA scheme, HARQ (Hybrid ARQ) control is performed to improve error correction capability at the time of retransmission by combining ARQ (Automatic Repeat reQuest) and an error correction code, and to reduce the number of retransmissions.

In such an HSUPA scheme, when user data is transmitted from each of a plurality of radio terminals to the radio base station apparatus, the scheduler unit of the radio base station apparatus performs scheduling of each of the plurality of radio terminals. Specifically, the scheduler unit of the radio base station apparatus considers the processing capability of the decoding processing unit of the radio base station apparatus, and the data amount of user data that can be decoded by the decoding processing unit Is calculated for each of a plurality of wireless terminals. Then, the scheduler unit of the radio base station apparatus calculates a power value used by the radio terminal for transmitting the calculated data amount of the user data for each of the plurality of radio terminals. The radio base station apparatus transmits power value information indicating the power value calculated by the scheduler unit to each of the plurality of radio terminals by using the downlink channel. Thereby, a plurality of radio terminals transmit user data to the radio base station apparatus according to the power value indicated by the transmitted power value information by using E-DCH individually assigned to each of the plurality of radio terminals. can do.
JP 2006-33865 A JP-T-2006-525757 JP 2006-87100 A

  By the way, the above radio base station apparatus refers to reception timing information (chip offset) in order to prevent each of a plurality of radio terminals from interfering, thereby determining the reception timing of user data by E-DCH. Different for each wireless terminal. That is, multiplexing is realized by distributing reception timings of user data of a plurality of wireless terminals based on reception timing information. The chip offset is specified in 3GPP TS 25.402 V7.5.0 (2007-12).

  Here, the conventional scheduler unit uniformly schedules a plurality of wireless terminals without referring to the reception timing information. For example, the scheduler unit schedules each of the plurality of wireless terminals by matching the reception timing of the wireless terminal with the latest reception timing of the user data with the reception timing of the other wireless terminal. For this reason, the scheduling by the conventional scheduler unit is not preferable from the viewpoint of effective use of the decoding processing unit, for example, the decoding processing by the decoding processing unit is not performed for a certain period of time.

  The present invention has been made in view of the above problems, and its purpose is to refer to reception timing information indicating reception timing of different user data for each of the plurality of wireless terminals, thereby allowing each of the plurality of wireless terminals to be referred to. It is an object of the present invention to provide a radio base station apparatus, a radio communication method, and a program that can effectively use a decoding processing unit by performing scheduling.

  In order to achieve the above object, a radio base station apparatus according to the present invention provides a radio interface unit capable of transmitting / receiving user data to / from each of a plurality of radio terminals, and encoded user data received by the radio interface unit. A decoding processing unit that performs decoding processing, and the wireless interface unit collectively outputs a result signal indicating whether or not the decoding processing has been normally completed to each of the plurality of wireless terminals. The wireless base station apparatus transmits the user data different for each of the plurality of wireless terminals when the wireless interface unit receives the encoded user data transmitted from each of the plurality of wireless terminals. A reception timing information recording unit for recording reception timing information indicating a reception timing of the wireless interface unit, and the wireless interface unit When receiving a request signal indicating a request to transmit user data transmitted from each of a plurality of wireless terminals, the reception timing of user data different for each of the plurality of wireless terminals indicated by the reception timing information, and Based on the transmission timing for collectively transmitting the result signal to each of the plurality of wireless terminals, at least the processable time during which the decoding processing unit can perform the decoding process is set as the plurality of wireless terminals. Calculated for each of the plurality of wireless terminals, and at least the amount of user data that can be decoded by the decoding processing unit within the calculated processable time. For each of the plurality of wireless terminals that transmitted the request signal so as to transmit the amount of data to the wireless base station device. And a scheduler unit that instructs via the interface unit.

  According to the radio base station apparatus of the present invention, when the radio interface unit receives a request signal indicating a request to transmit user data transmitted from each of a plurality of radio terminals, the scheduler unit receives the reception timing information Based on the reception timing of different user data for each of the plurality of wireless terminals and the transmission timing of transmitting the result signal to each of the plurality of wireless terminals collectively, at least the decoding processing unit performs the decoding process. The processable time that can be performed is calculated for each of the plurality of wireless terminals. In addition, the scheduler unit calculates, for each of the plurality of wireless terminals, the amount of user data that can be decrypted at least by the decoding processing unit within the calculated processable time. Furthermore, the scheduler unit instructs each of a plurality of wireless terminals that transmitted the request signal via the wireless interface unit to transmit the calculated amount of user data to the wireless base station device. . Thus, unlike the conventional scheduler unit, the decoding processing unit is effectively used as compared with the mode in which the scheduling of each of the plurality of wireless terminals is performed uniformly without referring to the reception timing information. be able to.

  The radio base station apparatus according to the present invention further includes a priority recording unit that records a priority associated with each of the plurality of radio terminals, and the scheduler unit determines the processable time as the priority. It is preferable that the calculation is performed for each of the plurality of wireless terminals.

  According to the above configuration, the scheduler unit can calculate the processable time for each of the plurality of wireless terminals according to the priority.

  To achieve the above object, a wireless communication method according to the present invention includes a wireless interface unit capable of transmitting / receiving user data to / from each of a plurality of wireless terminals, and a code transmitted from each of the plurality of wireless terminals by the wireless interface unit. A reception timing information recording unit for recording reception timing information indicating a reception timing of user data different for each of the plurality of wireless terminals when the converted user data is received, and an encoded received by the wireless interface unit A computer having a decryption processing unit that performs decryption processing on the received user data, a result signal indicating whether or not the decryption processing has ended normally is sent to each of the plurality of wireless terminals. A wireless communication method for executing a batch transmission process, the schedule provided in the computer When the unit receives a request signal indicating a request that the radio interface unit transmits user data transmitted from each of the plurality of radio terminals, for each of the plurality of radio terminals indicated by the reception timing information A process that allows at least the decoding processing unit to perform a decoding process based on a reception timing of different user data and a transmission timing at which the result signal is collectively transmitted to each of the plurality of wireless terminals. A possible time is calculated for each of the plurality of wireless terminals, and at least the amount of user data that can be decoded by the decoding processing unit within the calculated processing time is calculated for each of the plurality of wireless terminals. The plurality of request signals transmitted so that the calculated amount of user data is transmitted to the computer. For each wireless terminal includes a scheduler step of indicating via the wireless interface unit.

  In order to achieve the above object, a program according to the present invention is encoded by a radio interface unit capable of transmitting / receiving user data to / from each of a plurality of radio terminals, and the radio interface unit transmitted from each of the plurality of radio terminals. A reception timing information recording unit for recording reception timing information indicating a reception timing of user data different for each of the plurality of wireless terminals, and an encoded user received by the wireless interface unit A result signal indicating whether or not the decoding process has been normally completed is sent to a computer including a decoding processing unit that performs a decoding process on data for each of the plurality of wireless terminals. A program for executing processing to be transmitted, wherein the wireless interface unit includes the plurality of When receiving a request signal indicating a request to transmit user data transmitted from each of the line terminals, the reception timing of the user data different for each of the plurality of wireless terminals indicated by the reception timing information, and the result signal For each of the plurality of wireless terminals, at least a processable time during which the decoding processing unit can perform the decoding process based on a transmission timing at which the plurality of wireless terminals are collectively transmitted. Calculate the amount of user data that can be decoded at least by the decoding processing unit within the calculated processable time for each of the plurality of wireless terminals, and the calculated user data data The wireless interface for each of the plurality of wireless terminals that transmitted the request signal to transmit the amount to the computer. A scheduler process to instruct through the Esu unit causes the computer to perform.

  Note that the radio communication method and program according to the present invention obtain the same effects as those of the radio base station apparatus.

  As described above, the radio base station apparatus, the radio communication method, and the program according to the present invention refer to the reception timing information indicating the reception timing of user data different for each of the plurality of radio terminals, thereby By performing the scheduling, it is possible to effectively use the decoding processing unit.

  Hereinafter, more specific embodiments of the present invention will be described in detail with reference to the drawings.

[Embodiment 1]
FIG. 1 is a block diagram showing a schematic configuration of a communication system 1 according to the present embodiment. That is, the communication system 1 according to the present embodiment includes wireless terminals 2a to 2d, a wireless network control device 3, and a wireless base station device 4. The wireless terminals 2a to 2d and the wireless base station device 4 can access each other wirelessly. In the present embodiment, the HSUPA method is employed as a communication method between the wireless terminals 2a to 2d and the wireless base station device 4. For this reason, the radio terminals 2a to 2d according to the present embodiment use the E-DCH individually assigned to each of the radio terminals 2a to 2d, thereby encoding the radio base station apparatus 4 to the encoded user. Data can be transmitted at high speed. In addition to the HSUPA method, an HSDPA (High Speed Downlink Packet Access) method may be adopted as a communication method between the wireless terminals 2a to 2d and the wireless base station device 4.

  The wireless network control device 3 and the wireless base station device 4 are connected to each other by wire. In the present embodiment, an ATM (Asynchronous Transfer Mode) system is adopted as a communication system between the radio network control device 3 and the radio base station device 4. Further, the wireless network control device 3 is connected to the core network N. The core network N includes, for example, a circuit switching device, a packet switching device, a home location register, etc., although not shown.

  In FIG. 1, for simplicity of explanation, four wireless terminals 2 a to 2 d, one wireless network control device 3, and one wireless base station device 4 are illustrated, but the wireless terminals constituting the communication system 1 are illustrated. The numbers of 2a to 2d, the radio network control device 3, and the radio base station device 4 are arbitrary. Moreover, a terminal device and various servers (Web server, mail server, homepage server, proxy server, DNS server, DHCP server, authentication server, etc.) may exist on the communication system 1.

  Below, before demonstrating the detailed structure of the wireless base station apparatus 4, the whole structure of the communication system 1 is demonstrated easily.

  The wireless terminals 2a to 2d communicate with other wireless terminals or wired terminals via the wireless base station device 4, the wireless network control device 3, and the core network N. The wireless terminals 2 a to 2 d can also access the Internet via the wireless base station device 4, the wireless network control device 3, and the core network N. Here, the wireless terminals 2a to 2d according to the present embodiment are so-called 3.5th generation mobile phones, but are not limited thereto. For example, as the wireless terminals 2a to 2d, any other generation mobile phone, PHS (Personal Handy-phone System), PDA (Personal Digital Assistance), car navigation system, video playback terminal, electronic notebook, game terminal, GPS (Global Positioning System) terminal or the like.

  The radio terminals 2 a to 2 d have a function of transmitting encoded user data to the radio base station apparatus 4 by performing an encoding process on user data to be transmitted to the radio base station apparatus 4. ing. Furthermore, the radio terminals 2 a to 2 d have a function of performing a decoding process on the encoded user data transmitted from the radio base station apparatus 4.

  In the present embodiment, it is assumed that a request signal indicating a request to transmit user data is transmitted from each of the radio terminals 2a to 2d to the radio base station apparatus 4.

  A radio network controller (RNC; Radio Network Controller) 3 controls the radio base station apparatus 4 and performs outgoing / incoming connection control, call termination control, diversity handover control, and the like.

  The wireless base station device (Node-B) 4 includes a wireless interface unit (wireless IF unit) 41, a wired interface unit (wired IF unit in the diagram) 42, a control unit 43, and a baseband signal processing unit 44. I have. Here, the functions of the wireless interface unit 41, the wired interface unit 42, the control unit 43, and the baseband signal processing unit 44 are realized by an arithmetic device such as a CPU provided in the computer executing a predetermined program. The Therefore, a program for realizing the above functions by a computer or a recording medium on which the program is recorded is also an embodiment of the present invention.

  The wireless interface unit 41 mediates data exchange between the wireless terminals 2 a to 2 d and the baseband signal processing unit 44. For example, the wireless interface unit 41 receives request signals or user data transmitted from the wireless terminals 2 a to 2 d and outputs the received request signals or user data to the baseband signal processing unit 44. Further, for example, the radio interface unit 41 receives the result signal output from the baseband signal processing unit 44, and assigns the received result signal to the E-HICH (E-DCH Hybrid ARQ) commonly assigned to the radio terminals 2a to 2d. By using (Indicator Channel), the wireless terminals 2a to 2d are collectively transmitted. The result signal will be described later.

  The wired interface unit 42 mediates data exchange between the wireless network control device 3 and the baseband signal processing unit 44. For example, the wired interface unit 42 receives user data output from the baseband signal processing unit 44 (decoding processing unit 44b described later), and transmits the received user data to the wireless network control device 3. Further, for example, the wired interface unit 42 receives user data transmitted from the wireless network control device 3, and outputs the received user data to the baseband signal processing unit 44 (encoding processing unit 44c described later). In this embodiment, since the ATM system is adopted as a communication system between the wireless network control device 3 and the wireless base station device 4, the wired interface unit 42 has an ATM processing function, AAL (ATM Adaptation Layer). Signal processing function, SSOCP (Service Specific Connection Oriented Protocol) function, and the like.

  The control unit 43 transmits and receives call control signals to and from the wireless network control device 3 via the wired interface unit 42. In addition, the control unit 43 performs wireless line management (such as setting and releasing wireless lines) of the wireless terminals 2a to 2d. Furthermore, when the wireless interface unit 41 receives the request signal from the wireless terminals 2a to 2d, the control unit 43 differs from the wireless terminals 2a to 2d that transmitted the request signal to different user data for each of the wireless terminals 2a to 2d. Is assigned reception timing information (chip offset) indicating the reception timing. A method for assigning reception timing information by the control unit 43 is arbitrary. The control unit 43 records the assigned reception timing information in the reception timing information recording unit 43a together with an identification number that uniquely identifies the wireless terminals 2a to 2d. In the present embodiment, the reception timing information recording unit 43a is constructed on a memory in the control unit 43, but may be constructed on a recording medium that is detachable from the radio base station apparatus 4. Good.

FIG. 2 is a diagram illustrating an example of data recorded in the reception timing information recording unit 43a according to the present embodiment. That is, the reception timing information recording unit 43a according to the present embodiment records data as a table 430a. The data structure is not limited to the table structure, and is arbitrary. In the example shown in FIG. 2, the identification number “aaa” of the wireless terminal 2a and the reception timing information “1” are recorded in the first row of the table 430a. In the second row of the table 430a, the identification number “bbb” of the wireless terminal 2b and the reception timing information “2” are recorded. In the third row of the table 430a, the identification number “ccc” of the wireless terminal 2c and the reception timing information “3” are recorded. In the fourth row of the table 430a, the identification number “ddd” of the wireless terminal 2d and the reception timing information “4” are recorded. The reception timing information “1” indicates time t ₁ . The reception timing information “2” indicates time t ₂ (t ₂ > t ₁ ). The reception timing information “3” indicates time t ₃ (t ₃ > t ₂ ). The reception timing information “4” indicates time t ₄ (t ₄ > t ₃ ).

  The baseband signal processing unit 44 has functions such as transmission data encoding, framing, spread modulation, reception data despreading, data decoding, HARQ, and scheduling. Therefore, the baseband signal processing unit 44 includes a demodulation unit 44a, a decoding processing unit 44b, an encoding processing unit 44c, a modulation unit 44d, and a scheduler unit 44e.

  The demodulation unit 44a performs demodulation processing on the user data output from the wireless interface unit 41. The demodulator 44a outputs the demodulated user data to the decoding processor 44b.

  The decoding processing unit 44b is configured by, for example, a turbo decoder. The turbo decoder performs soft decision decoding using a MAP (Maximum a-posteriori Probability) algorithm or the like. Specifically, the decoding processing unit 44b first performs a decoding process on the user data output from the demodulation unit 44a. Then, the decoding processing unit 44b performs error detection on the decoding result of the decoding processing using an error detection code (CRC, parity code, checksum, etc.). If no error is detected in the decoding result, the decoding processing unit 44 b outputs the decoded user data to the wired interface unit 42. In this case, the decoding processing unit 44a transmits a result signal (Ack signal) indicating that the decoding process has been normally completed to the wireless terminals 2a to 2d that have transmitted the user data. 41 is instructed.

  On the other hand, when an error is detected in the decoding result, the decoding processing unit 44b feeds back the decoding result and performs the decoding process again. Then, the decoding processing unit 44b performs error detection again on the decoding result of the decoding processing using the error detection code. If no error is detected in the decoding result, the decoding processing unit 44 b outputs the decoding result to the wired interface unit 42. On the other hand, when an error is detected in the decoding result, the decoding processing unit 44b feeds back the decoding result and performs the decoding process again. That is, the decoding processing unit 44b repeats the feedback up to a predetermined number of times. The decoding processing unit 44b performs the following process when an error is detected in the decoding result even if the feedback is repeated up to a predetermined number of times. That is, the decryption processing unit 44b transmits the result signal (Nack signal) indicating that the decryption process has not ended normally to the wireless terminals 2a to 2d that transmitted the user data. The unit 41 is instructed.

  The encoding processing unit 44 c performs an encoding process on the user data output from the wired interface unit 42. The encoding processing unit 44c outputs the user data subjected to the encoding process to the modulation unit 44d.

  The modulation unit 44d performs modulation processing on the user data output from the encoding processing unit 44c. The modulation unit 44d outputs the user data subjected to the modulation process to the wireless interface unit 41.

  When the wireless interface unit 41 receives a request signal from the wireless terminals 2a to 2d, the scheduler unit 44e refers to the reception timing information recorded in the reception timing information recording unit 43a, so that each of the wireless terminals 2a to 2d Scheduling.

Specifically, the scheduler unit 44e first reads the reception timing information recorded in the reception timing information recording unit 43a, and analyzes the read reception timing information. As a result of the analysis, the scheduler unit 44e determines that the reception timing information “1” is time t ₁ , the reception timing information “2” is time t ₂ , the reception timing information “3” is time t ₃ , and the reception timing information “4” is time. It is determined that t ₄ is indicated.

FIG. 3 is an explanatory diagram for explaining respective reception timings of user data of the wireless terminals 2a to 2d according to the present embodiment. FIG as shown in 3, the reception timing is time t ₁ of the user data of the wireless terminal 2a, the time t ₂ the reception timing of the user data of the wireless terminal 2b, the reception timing of the user data of the wireless terminal 2c is a time t _3, the radio reception timing of the user data of the terminal 2e is a time t _4. In FIG. 3, time t ₁ to time t ₂ are time “a”, time t ₂ to time t ₃ are time “b”, time t ₃ to time t ₄ are time “c”, time t ₄ to time t ₆ is represented as time “d”.

Further, the scheduler unit 44e transmits the result signals (Ack signal and Nack signal) to each of the wireless terminals 2a to 2d based on the reception timing information recorded in the reception timing information recording unit 43a. Is determined. In the present embodiment, the scheduler unit 44e, as a transmission timing, as shown in FIG. 3, it is assumed that determining the time t _8. A specific calculation method for determining the transmission timing is defined in 3GPP TS 25.211 V7.4.0 (2007-11).

  The scheduler unit 44e performs at least decoding based on each reception timing of user data of the wireless terminals 2a to 2d and transmission timing for transmitting the result signal to each of the wireless terminals 2a to 2d in a lump. The processable time during which the processing unit 44b can perform the decoding process is calculated for each of the wireless terminals 2a to 2d. Here, at time “a”, the decryption processing unit 44b can perform decryption processing on the user data of the wireless terminal 2a. Also, at time “b”, the decryption processing unit 44b can perform decryption processing on the user data of the wireless terminal 2a and the user data of the wireless terminal 2b. Also, at time “c”, the decryption processing unit 44b can perform decryption processing on the user data of the wireless terminal 2a, the user data of the wireless terminal 2b, and the user data of the wireless terminal 2c. . Further, at time “d”, the decoding processing unit 44b performs the user data of the wireless terminal 2a, the user data of the wireless terminal 2b, the user data of the wireless terminal 2c, and the user data of the wireless terminal 2d. Decryption processing can be performed.

  That is, when the user data of the wireless terminals 2a to 2d are processed equally, the processable time of the wireless terminals 2a to 2d is as follows. That is, the processable time of the wireless terminal 2a is “a + b / 2 + c / 3 + d / 4”. Further, the processable time of the wireless terminal 2b is “b / 2 + c / 3 + d / 4”. Further, the processable time of the wireless terminal 2c is “c / 3 + d / 4”. Furthermore, the processable time of the wireless terminal 2d is “d / 4”. As described above, the scheduler unit 44e according to the present embodiment can calculate the processable time of the wireless terminals 2a to 2d while considering the reception timing of user data that differs for each of the wireless terminals 2a to 2d.

  The scheduler unit 44e calculates, for each of the wireless terminals 2a to 2d, the amount of user data that can be decoded at least by the decoding processing unit 44b within the processable time calculated as described above. In addition, the scheduler unit 44e calculates, for each of the wireless terminals 2a to 2d, a power value used (consumed) by the wireless terminals 2a to 2d to transmit the calculated amount of user data. Therefore, the scheduler unit 44e includes a data amount conversion table 440e and a power value conversion table 441e as shown in FIG.

  Specifically, the scheduler unit 44e first converts (calculates) the processable time calculated for each of the wireless terminals 2a to 2d into the data amount of user data by referring to the data amount conversion table 440e shown in FIG. ) In the example shown in FIG. 5, the unit of processable time is represented by “μs”, and the data amount of user data is represented by “bit”. Further, the scheduler unit 44e converts (calculates) the data amount of user data calculated for each of the wireless terminals 2a to 2d into a power value by referring to the power value conversion table 441e illustrated in FIG. In the example illustrated in FIG. 6, the unit of the power value is represented by “mw”. The contents of the data shown in FIGS. 5 and 6 are merely examples, and the present invention is not limited to this.

  The scheduler unit 44e instructs the wireless interface unit 41 to transmit the power value calculated for each of the wireless terminals 2a to 2d to each of the wireless terminals 2a to 2d that transmitted the request signal. The wireless interface unit 41 transmits power value information indicating the power value calculated by the scheduler unit 44e to each of the wireless terminals 2a to 2d that transmitted the request signal together with a permission signal indicating transmission permission. That is, the scheduler unit 44e transmits the request data to each of the wireless terminals 2a to 2d that transmitted the request signal so that the amount of user data calculated for each of the wireless terminals 2a to 2d is transmitted to the wireless base station device 4. And instructing via the wireless interface unit 41.

  Next, the operation of the communication system 1 according to the above configuration will be described with reference to FIGS.

  FIG. 7 is a flowchart showing an example of the operation of the communication system 1 according to the present embodiment. As illustrated in FIG. 7, the radio terminals 2a to 2d transmit a request signal indicating a request for transmitting user data to the radio base station apparatus 4 (Op1). The radio interface unit 41 of the radio base station apparatus 4 receives the request signal transmitted in Op1 (Op2). When the request signal is received by the wireless interface unit 41 in Op2, the scheduler unit 44e refers to the reception timing information recorded in the reception timing information recording unit 43a, thereby scheduling each of the wireless terminals 2a to 2d. (Op3).

  Here, an example of processing of the scheduler unit 44e in Op3 will be described with reference to FIG.

  FIG. 8 is a flowchart illustrating an example of scheduling processing by the scheduler unit 44e according to the present embodiment. As illustrated in FIG. 8, the scheduler unit 44 e includes a reception timing of user data of the wireless terminals 2 a to 2 d and a transmission timing for transmitting a result signal to the wireless terminals 2 a to 2 d in a lump. Based on the above, at least the processable time that the decoding processing unit 44b can perform the decoding process is calculated for each of the wireless terminals 2a to 2d (Op31).

  Next, the scheduler unit 44e calculates, for each of the wireless terminals 2a to 2d, the amount of user data that can be decoded at least by the decoding processing unit 44b within the processable time calculated in Op31. (Op32). Then, the scheduler unit 44e calculates, for each wireless terminal 2a to 2d, a power value used (consumed) by the wireless terminals 2a to 2d to transmit the data amount of the user data calculated in Op 32 (Op 33). .

  Then, the scheduler unit 44e instructs the wireless interface unit 41 to transmit the power value calculated for each of the wireless terminals 2a to 2d to each of the wireless terminals 2a to 2d that transmitted the request signal (Op34). .

  Returning to FIG. 7, the radio interface unit 41 transmits the power value information indicating the power value calculated in Op33 in accordance with the instruction of Op34, together with the permission signal indicating transmission permission, to the wireless terminals 2a to 2d that transmitted the request signal. It transmits to each (Op4). The radio terminals 2a to 2d receive the power value information transmitted in Op4 together with the permission signal (Op5).

  The radio terminals 2a to 2d use the E-DCH individually assigned to each of the radio terminals 2a to 2d, so that the encoded user data is transmitted according to the power value indicated by the power value information received in Op5. It transmits to the radio base station apparatus 4 (Op6). The radio interface unit 41 of the radio base station apparatus receives the user data transmitted in Op6 (Op7).

  Next, the demodulation unit 44a performs demodulation processing on the user data received at Op7 (Op8). The decoding processing unit 44b performs decoding processing on the user data demodulated at Op8 (Op9). Then, the decoding processing unit 44a instructs the wireless interface unit 41 to transmit a result signal indicating whether or not the decoding processing has been normally completed to the wireless terminals 2a to 2d that transmitted the user data. (Op10).

  The radio interface unit 41 transmits the result signal collectively to each of the radio terminals 2a to 2d by using the E-HICH that is commonly assigned to the radio terminals 2a to 2d in accordance with the instruction of Op10 ( Op11).

  If the result signal transmitted at Op11 is an “Ack signal” (YES at Op12), the processing in FIG. 7 is terminated. On the other hand, if the result signal transmitted at Op11 is a “Nack signal” (No at Op12), the process returns to Op6 and the processes after Op6 are repeated up to a predetermined number of times.

  As described above, according to the radio base station apparatus 4 according to the present embodiment, the radio interface unit 41 has received a request signal indicating a request to transmit user data transmitted from each of the radio terminals 2a to 2d. In this case, the scheduler unit 44e uses different user data reception timings for the wireless terminals 2a to 2d indicated by the reception timing information, and transmission timings for transmitting the result signals to the wireless terminals 2a to 2d in a lump. Based on this, a processable time at which at least the decoding processing unit 44b can perform the decoding process is calculated for each of the wireless terminals 2a to 2d. In addition, the scheduler unit 44e calculates, for each of the wireless terminals 2a to 2d, the amount of user data that can be decoded at least by the decoding processing unit 44b within the calculated processable time. Furthermore, the scheduler unit 44e sets the radio interface unit 41 to each of the radio terminals 2a to 2d that transmitted the request signal so as to transmit the calculated amount of user data to the radio base station device 4. Direct through. As a result, the decoding processing unit 44b is made effective compared to the mode in which the scheduling of the wireless terminals 2a to 2d is performed uniformly without referring to the reception timing information as in the conventional scheduler unit. Can be used.

[Embodiment 2]
FIG. 9 is a block diagram showing a schematic configuration of the communication system 5 according to the present embodiment. That is, the communication system 5 according to the present embodiment includes a radio base station apparatus 6 instead of the radio base station apparatus 4 shown in FIG. 9, components having the same functions as those in FIG. 1 are given the same reference numerals, and detailed descriptions thereof are omitted.

  The radio base station apparatus 6 according to the present embodiment includes a baseband signal processing unit 61 instead of the baseband signal processing unit 44 illustrated in FIG. Furthermore, the baseband signal processing unit 61 according to the present embodiment includes a scheduler unit 61a instead of the scheduler unit 44e illustrated in FIG.

  As shown in FIG. 10, the scheduler unit 61a includes a data amount conversion table 611a, a power value conversion table 612a, and a priority table 613a. The data amount conversion table 611a is the same as the data amount conversion table 440e shown in FIG. The power value conversion table 612a is the same as the power value conversion table 441e shown in FIG.

  FIG. 11 is a diagram illustrating an example of data recorded in the priority table 613a according to the present embodiment. As shown in FIG. 11, in the priority table (priority recording unit) 613a, the identification number of the wireless terminal and the priority are recorded. The priority indicates the priority order of the wireless terminals 2a to 2d. The lower the numerical value, the higher the priority order. That is, the priority “1” has the highest priority. The data structure is not limited to the table structure, and is arbitrary.

  In the example shown in FIG. 11, the identification number “aaa” of the wireless terminal 2a and the priority “3” are recorded in the first row of the priority table 613a. In the second row of the priority table 613a, the identification number “bbb” of the wireless terminal 2b and the priority “2” are recorded. In the third row of the priority table 613a, the identification number “ccc” of the wireless terminal 2c and the priority “1” are recorded. Furthermore, the identification number “ddd” of the wireless terminal 2d and the priority “4” are recorded in the fourth row of the priority table 613a.

  Similar to the scheduler unit 44e shown in FIG. 1, the scheduler unit 61a refers to the reception timing information recorded in the reception timing information recording unit 43a when the wireless interface unit 41 receives a request signal from the wireless terminals 2a to 2d. By doing so, each of the radio terminals 2a to 2d is scheduled. However, the scheduler unit 61a according to the present embodiment is different from the calculation process of the scheduler unit 44e shown in FIG. For this reason, below, the calculation process of the processable time by the scheduler part 61a is demonstrated.

  That is, the scheduler unit 61a receives the user data of the wireless terminals 2a to 2d, the transmission timing for transmitting the result signals to the wireless terminals 2a to 2d in a lump, and the priority table 613a. On the basis of the priority recorded in the above, at least the processable time during which the decoding processing unit 44b can perform the decoding process is calculated for each of the wireless terminals 2a to 2d. Specifically, the scheduler unit 61a increases the processable time for wireless terminals with high priority, and shortens the processable time for wireless terminals with low priority. The processable time is calculated for each of the wireless terminals 2a to 2d.

  For example, at time “b” (see FIG. 3), the decoding processing unit 44b can perform decoding processing on the user data of the wireless terminal 2a and the user data of the wireless terminal 2b. In the example shown in FIG. 11, the priority of the wireless terminal 2a is “3”, and the priority of the wireless terminal 2b is “2”. That is, the wireless terminal 2b has a higher priority than the wireless terminal 2a. Therefore, the scheduler unit 61a according to the present embodiment does not calculate the processable time “b / 2” of the wireless terminal 2a and the processable time “b / 2” of the wireless terminal 2b at the time “b”. In addition, the processable time is calculated so that the processable time becomes longer for the radio terminal 2b having a higher priority and the processable time is shortened for the radio terminal 2a having a lower priority. . For example, at the time “b”, the scheduler unit 61a calculates the processable time “3b / 5” of the high-priority wireless terminal 2b and the processable time “2b / 5” of the low-priority wireless terminal 2a. .

  As described above, according to the radio base station apparatus 6 according to the present embodiment, the scheduler unit 61a can calculate the processable time for each of the radio terminals 2a to 2d according to the priority.

  In the first and second embodiments, the case where the radio base station apparatus and the radio network control apparatus are different from each other in terms of hardware has been described, but the present invention is not limited to this. That is, the wireless base station device and the wireless network control device may be the same device in hardware. That is, the wireless base station device may be provided with the function of the wireless network control device.

  In other words, the present invention is not limited to the first and second embodiments described above, and various modifications can be made within the scope of the claims. That is, embodiments obtained by combining technical means appropriately modified within the scope of the claims are also included in the technical scope of the present invention.

  As described above, the present invention refers to the reception timing information indicating the reception timing of user data that is different for each of the plurality of wireless terminals, and performs the scheduling of each of the plurality of wireless terminals, thereby It is useful as a radio base station apparatus, radio communication method, or program that can be used effectively.

FIG. 1 is a block diagram showing a schematic configuration of a communication system according to the first embodiment of the present invention. FIG. 2 is a diagram illustrating an example of data recorded in the reception timing information recording unit. FIG. 3 is an explanatory diagram for explaining respective reception timings of user data of the wireless terminal. FIG. 4 is a block diagram showing a schematic configuration of the scheduler unit. FIG. 5 is a diagram illustrating an example of data recorded in the data amount conversion table. FIG. 6 is a diagram illustrating an example of data recorded in the power value conversion table. FIG. 7 is a flowchart showing an example of the operation of the communication system. FIG. 8 is a flowchart showing an example of the operation of the scheduler unit. FIG. 9 is a block diagram showing a schematic configuration of a communication system according to the second embodiment of the present invention. FIG. 10 is a block diagram illustrating a schematic configuration of the scheduler unit. FIG. 11 is a diagram illustrating an example of data recorded in the priority recording unit.

Explanation of symbols

2a to 2d Radio terminal 4, 6 Radio base station apparatus 41 Radio interface unit 43a Reception timing information recording unit 44b Decoding processing unit 44e, 61a Scheduler unit 613a Priority table (priority recording unit)

Claims (4)

A wireless interface unit capable of transmitting / receiving user data to / from each of a plurality of wireless terminals; and a decoding processing unit configured to perform decoding processing on encoded user data received by the wireless interface unit, The interface unit is a radio base station apparatus that collectively transmits a result signal indicating whether or not the decoding process has been normally completed to each of the plurality of radio terminals,
Reception for recording reception timing information indicating reception timing of user data different for each of the plurality of wireless terminals when the wireless interface unit receives encoded user data transmitted from each of the plurality of wireless terminals. A timing information recording unit;
When the wireless interface unit receives a request signal indicating a request to transmit user data transmitted from each of the plurality of wireless terminals, user data different for each of the plurality of wireless terminals indicated by the reception timing information And a processable time during which at least the decoding processing unit can perform the decoding process based on the reception timing of the received signal and the transmission timing at which the result signal is transmitted to each of the plurality of wireless terminals at once. Calculating for each of the plurality of wireless terminals, calculating for each of the plurality of wireless terminals, the amount of user data that can be decoded at least by the decoding processing unit within the calculated processable time, In addition, the plurality of radios that transmitted the request signal so as to transmit the calculated data amount of user data to the radio base station apparatus. For each end, the radio base station apparatus and a scheduler unit that instructs via the wireless interface unit. A priority recording unit for recording the priority associated with each of the plurality of wireless terminals;
The radio base station apparatus according to claim 1, wherein the scheduler unit calculates the processable time for each of the plurality of radio terminals according to the priority. A radio interface unit capable of transmitting / receiving user data to / from each of a plurality of radio terminals; and the plurality of radios when the radio interface unit receives encoded user data transmitted from each of the plurality of radio terminals. A reception timing information recording unit that records reception timing information indicating reception timing of user data that differs for each terminal, and a decoding processing unit that performs a decoding process on the encoded user data received by the wireless interface unit A wireless communication method for executing a process of collectively transmitting a result signal indicating whether or not the decoding process has been normally completed to each of the plurality of wireless terminals. ,
If the pre-Symbol wireless interface unit has received a request signal indicating a request to be sent the user data transmitted from each of said plurality of wireless terminals, different users for each of the plurality of radio terminal to which the reception timing information indicates Based on the data reception timing and the transmission timing for transmitting the result signal to each of the plurality of wireless terminals in a batch, the processable time at which at least the decoding processing unit can perform the decoding process For each of the plurality of wireless terminals, and for each of the plurality of wireless terminals, a data amount of user data that can be decrypted at least by the decoding processing unit within the calculated processable time. And the plurality of wireless terminals that have transmitted the request signal so as to transmit the calculated amount of user data to the computer. Against each include a scheduler step of indicating via the wireless interface unit, a wireless communication method. A radio interface unit capable of transmitting / receiving user data to / from each of a plurality of radio terminals; and the plurality of radios when the radio interface unit receives encoded user data transmitted from each of the plurality of radio terminals. A reception timing information recording unit that records reception timing information indicating reception timing of user data that differs for each terminal, and a decoding processing unit that performs a decoding process on the encoded user data received by the wireless interface unit A program that causes a computer having the above-described processing to transmit a result signal indicating whether or not the decoding process has been normally completed to each of the plurality of wireless terminals,
When the wireless interface unit receives a request signal indicating a request to transmit user data transmitted from each of the plurality of wireless terminals, user data different for each of the plurality of wireless terminals indicated by the reception timing information And a processable time during which at least the decoding processing unit can perform the decoding process based on the reception timing of the received signal and the transmission timing at which the result signal is transmitted to each of the plurality of wireless terminals at once. Calculating for each of the plurality of wireless terminals, calculating for each of the plurality of wireless terminals, the amount of user data that can be decoded at least by the decoding processing unit within the calculated processable time, In addition, the plurality of wireless terminals that transmitted the request signal so as to transmit the calculated amount of user data to the computer. Against each to execute the scheduler process to instruct via the wireless interface unit to the computer, programs.

Images