JP2006340218A - Packet transmission apparatus and packet transmission method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide flexible broadcast/multicast services while suppressing deterioration in transmission efficiency. <P>SOLUTION: A control station apparatus 100 has a control unit 110 for controlling the entire apparatus; and a data generating unit 120 for generating scheduling information and packet data to be informed by the scheduling information. The apparatus 100 transfers each of the generated packets using a multicast transmission frame to a base station apparatus 150. The data generating unit 120 is provided with a buffer 121, a scheduler 122, and a data assembler 123; and the unit 120 changes the arrangement of the scheduling information or intervals depending on services. Service additional scheduling information 602 is arranged on a position in transmission period of fixed scheduling information 601 and corresponding to packets for each service, thereby changing the scheduling information for each service. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a packet transmission apparatus and a packet transmission method for transmitting control information used in one-to-many communication forms such as MBMS (Multimadia Broadcast / Multicast Service).

  In the field of mobile communication, technical studies on multimedia broadcast / multicast service (hereinafter referred to as MBMS) have recently been made (for example, see Non-Patent Document 1). Communication performed in MBMS is not point-to-point (P-to-P) communication but point-to-multipoint (P-to-M) communication. That is, in MBMS, one base station transmits the same data (for example, music data, video image data, etc.) simultaneously to a plurality of mobile stations.

  MBMS has a broadcast mode and a multicast mode. The broadcast mode is a mode in which information is transmitted to all mobile stations as in the current radio broadcast, whereas the multicast mode is information only for specific mobile stations that subscribe to the service such as newsgroups. A transmission mode is assumed.

  Advantages of performing MBMS include the following. In other words, when each mobile station receives information transmitted from a base station using a channel in a streaming service or the like, if the number of mobile stations that want to receive the information increases, the load on the radio line is large. turn into. However, when MBMS is used, even when the number of mobile stations increases, all of the mobile stations receive information using the same channel, so that the number of mobile stations that can receive information is increased without increasing the load on the radio line. be able to. Currently, traffic information distribution, music distribution, station news distribution, sports broadcast distribution, etc. are considered as services using MBMS, and it is considered to perform at a transmission rate of about 8 to 256 kbps. .

  The use of S-CCPCH (Secondary Common Control Physical Channel) used in the current W-CDMA mobile communication system as a channel for transmitting the same data simultaneously to a plurality of mobile stations in MBMS is being studied. Yes. S-CCPCH is a downlink common channel and is used for paging signals and data transmission from higher layers in the current W-CDMA mobile communication system. Also, in S-CCPCH, transmission power control is not performed, and data is transmitted with a relatively large constant transmission power that can cover the entire cell (see, for example, Non-Patent Document 2). This constant transmission power is instructed from the upper layer (control station) to the base station.

  FIG. 8 is a diagram illustrating a configuration example of a conventional packet transmission apparatus. As shown in FIG. 8, the MBMS service system includes a packet transmission device 11 that is a base station device, a radio control device 12 that is a host device, and a mobile station device 13.

  The packet transmission device 11 includes packet transmission means 14. Packets of the MBMS service (three services A, B, and C in the illustrated example) and scheduling information are input in parallel from the wireless control device 12 to the packet transmission unit 14. The scheduling information describes the scheduling contents of the packet for each service (timing when transmitting the packet of each service, length of transmission time, etc.).

  The packet transmission means 14 arranges a data packet (service A), a data packet (service B), and a data packet (service C) in a time division manner in a multicast transmission frame based on scheduling information (SI). The information packet is arranged at the final position of the frame and transmitted to the mobile station apparatus 13 using the physical channel. A specific description will be given with reference to FIG.

  FIG. 9 is a diagram for explaining a conventional packet transmission method. In FIG. 9, TTI (Transmission time interval) is a time interval for transmitting one packet. A (A1 to A9) is a packet of MBMS service A, B (B1 to B6) is a packet of MBMS service B, C (C1, C2) is a packet of MBMS service C, and S (S1, S2 , S3) is a scheduling information packet (MBMS Scheduling Information).

  In FIG. 9, three multicast transmission frames (a), (b), and (c) are shown. Each multicast transmission frame is composed of 18 TTIs, and the 17th TTI from the head is for data packet placement. Yes, the last 1 TTI is for placement of the scheduling information packet S. Then, in the example shown in FIG. 9, these are sent out on the physical channel successively in the order of (a) (b) (c).

  In short, on the physical channel on which the MBMS service packet is placed, the scheduling information packet S is transmitted at regular intervals (at a rate of once every 18 TTIs in the example shown in FIG. 9). This scheduling information packet S describes the transmission start timing and the length (number of TTIs) for each MBMS service transmitted in the 17 TTI period until the next scheduling information packet S is transmitted.

  In the multicast transmission frame shown in FIG. 9A, there is no data packet in 17TTI from time T = 0 to time T = 17, and the scheduling information packet S1 is inserted at the final position. First, when receiving the scheduling information from the radio network controller 12, the packet transmitter 14 notifies the mobile station device 13 of the contents as a scheduling information packet S1 as shown in FIG. 9A.

  In the next multicast transmission frame (b), for example, service A packets A1 to A6 are transmitted in a section from time T = 18 to length 6 TTI, and from time T = 27 to length 3 TTI in the next multicast transmission frame (b). It is described that the packets B1 to B3 of the service B are transmitted in the section, and the packet C1 of the service C is transmitted in the section having a length of 1 TTI from the time T = 32.

  Therefore, the packet transmission means 14 generates a multicast transmission frame shown in FIG. 9B reflecting the contents of the scheduling information packet S1 and transmits it to the mobile station apparatus 13. That is, as shown in FIG. 9B, in this multicast transmission frame, packets A1 to A6 of service A are arranged in a section from time T = 18 to length 6 TTI, and a section from time T = 27 to length 3 TTI. The service B packets B1 to B3 are arranged in the service C, the service C packet C1 is arranged in a section from the time T = 32 to a length of 1 TTI, and the scheduling information packet S2 is inserted at the final position.

  The mobile station apparatus 13 that receives any one of the MBMS services A, B, and C receives the scheduling information packet S1 of the multicast transmission frame (a), so that in the multicast transmission frame (b) that is subsequently transmitted. Since the start timing and the length (number of TTIs) of the service to be received can be known, the user can receive the packet of the service to be received. Since the mobile station apparatus 13 is notified in advance as known information of the timing at which the scheduling information packet is transmitted for each packet transmission apparatus 11, the mobile station apparatus 13 receives the MBMS service packet even when moving between cells. can do.

  Similarly, in the scheduling information packet S2 notified to the mobile station apparatus 13 by the multicast transmission frame shown in FIG. 9B, for example, packets A7 to A9 of the service A are transmitted in the section from time T = 36 to length 3 TTI. It is described that service B packets B4 to B6 are transmitted in a section from time T = 41 to length 3 TTI, and service C packet C2 is transmitted in a section from time T = 50 to length 1 TTI. .

  Then, the packet transmission means 14 generates a multicast transmission frame shown in FIG. 9C reflecting the contents of the scheduling information packet S2 and transmits it to the mobile station apparatus 13. That is, as shown in FIG. 9 (c), in this multicast transmission frame, packets A7 to A9 of service A are arranged in a section from time T = 36 to length 3TTI, and a section from time T = 41 to length 3TTI. The service B packets B4 to B6 are arranged in the service C, the service C packet C2 is arranged in a section from the time T = 50 to a length of 1 TTI, and the scheduling information packet S3 is inserted at the final position. Thereafter, the same multicast transmission operation is repeated.

  Hereinafter, scheduling information will be described in more detail.

  FIG. 10 is a diagram showing a configuration of Scheduling Information in MBMS discussed in 3GPP. In MBMS, MCCH (MBMS Control Channel) for control and MTCH (MBMS Traffic Channel) for data are considered as traffic channels. Both of these are mapped to a physical channel called S-CCPCH (Secondary Common Control Physical Channel) and transmitted from the base station to the mobile station.

  Here, it is considered that a plurality of MTCHs are mapped to one S-CCPCH. At this time, if the transmission timing of each MTCH is fixed, the degree of freedom of service becomes low, so the transmission timing is not fixed. For this purpose, scheduling information for notifying when each MTCH is transmitted is necessary.

  An example of scheduling information is shown in 3GPP contribution R2-040756. As shown in FIG. 10, scheduling information is transmitted once in 64 frames (640 ms), and the MTCH transmission start time and the transmission length are described for each service. For example, in the configuration of the scheduling information shown in FIG. 10A, the position / length of the service 1 data is “256 (frame number) / 32 (frame length)” (see FIG. 10B). SFN 255 of Scheduling Information), “320/32” (SFN 319 of Scheduling Information), “384/32” (SFN 383 of Scheduling Information), and “448/32” (SFN 447 of Scheduling Information). Similarly, the position / length of the service 2 data is “292/16” (SFN 255 of Scheduling Information), “356/8” (SFN 319 of Scheduling Information), “420/16” (SFN 383 of Scheduling Information), This is notified by “484/8” (SFN 447 of Scheduling Information). Further, the position / length of the data of the service 3 is only “508/8” (SFN 255, SFN 319, SFN 383, SFN 447 of Scheduling Information).

In this example, it is proposed to quickly detect Scheduling Information by transmitting Scheduling Information at a fixed period.
3GPP TS 22.146 V6.0.0 (2002-06): 3rd Generation Partnership Project; Technical Specification Group Services and System Aspects; Multimedia Broadcast / Multicast Service; Stage 1 (Release 6) June 2002 3GPP TS 25.211 V5.1.0 (2002-06): 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Physical channels and mapping of transport channels onto physical channels (FDD) (Release 5) June 2002 5.3.3.4 Secondary Common Control Physical Channel (S-CCPCH)

  However, such a conventional packet communication apparatus has the following problems because the scheduling information is transmitted at fixed intervals as described above.

  11 and 12 are diagrams illustrating an example of scheduling information transmitted at fixed intervals.

  As shown in FIG. 11, since scheduling information is transmitted once in 64 frames (640 ms), if there is a service that wants to send a plurality of MTCHs at intervals shorter than 64 frames, it cannot be received. For example, as shown in FIG. 11, a plurality (two) of service 1 data cannot be transmitted at intervals shorter than 64 frames. More precisely, even if a plurality of MTCHs are sent at intervals shorter than 64 frames, the position / length cannot be notified by scheduling information, and as a result, they cannot be received. This is clear from the scheduling information shown in FIG.

  In order to avoid this, when adopting a mode of transmission with a short transmission cycle, it is necessary to read the scheduling information that is set finely, and unnecessary information is often sent, resulting in a decrease in transmission efficiency. . In addition, the power consumption increases.

  Also, as in service 2 shown in FIG. 12, when the scheduling information and the data transmission interval are close in time, signals from other base stations can be monitored and power consumption can be reduced while there is no data. Control that stops the receiver may not be possible.

  The present invention has been made in view of this point, and an object of the present invention is to provide a packet transmission apparatus and a packet transmission method capable of providing a flexible broadcast / multicast service while suppressing a decrease in transmission efficiency. .

  The packet transmission apparatus according to the present invention arranges first scheduling information indicating scheduling contents of packets for each service in a fixed period in a multicast transmission frame in which packets for each service are arranged in a time division manner. And arranging means for arranging the second scheduling information at a position corresponding to the packet for each service, and transmitting the arranged packet for each service and the first and second scheduling information to the mobile station apparatus. A configuration including transmission means is employed.

  The packet transmission method according to the present invention includes a step of obtaining scheduling information indicating scheduling contents of packets for each service, and a first scheduling information for each fixed period in a multicast transmission frame in which the packets for each service are arranged in a time-sharing manner. Placing the second scheduling information at a position corresponding to the packet for each service between the fixed period, the packet for each service, and the first and second scheduling information arranged Transmitting to the mobile station apparatus.

  According to the present invention, it is possible to provide a flexible broadcast / multicast service while suppressing a decrease in transmission efficiency.

  In addition, the circuit scale and power consumption of the mobile terminal can be reduced.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
FIG. 1 is a block diagram showing a configuration of a packet transmission apparatus that provides MBMS according to Embodiment 1 of the present invention. First, a packet transmission apparatus that transmits a packet related to MBMS will be described.

  In FIG. 1, a control station apparatus (RNC: Radio Network Controller) 100 includes a control section 110 that controls the entire apparatus, a scheduling information, and a data generation section that generates packet data notified by this juling information. 120, and transfers each generated packet to the base station apparatus (Node B) 150 in a multicast transmission frame.

  FIG. 2 is a block diagram illustrating a configuration of the data generation unit 120. 2, the data generation unit 120 includes a buffer 121, a scheduling unit 122, and a data assembly unit 123.

  The buffer 121 temporarily stores MBMS service packets from the network. Based on the packet and the control signal, the scheduling unit 122 creates the scheduling content of the packet for each service (timing when transmitting the packet of each service, length of time to transmit, etc.). The control signal supplied from the control unit 110 includes priority (service class), allowable delay, and the like. The scheduling unit 122 monitors the state of the buffer 121, for example, a buffer amount that is addressed to each receiving terminal (UE: User Equipment), and a buffer time that is a time until downlink data received from the control unit 110 is transmitted to the receiving terminal. Monitor (or estimate) the residence time.

  Based on the information described in the scheduling unit 122, the data assembling unit 123 arranges a plurality of data packets (for example, service 1, service 2, service 3) in a time division manner in the multicast transmission frame, and assigns scheduling information to the final frame of the frame. It arrange | positions to the predetermined position containing a position, and transmits toward a mobile station apparatus using a physical channel. This packet transmission apparatus is characterized in that the arrangement or interval of scheduling information is changed according to the service. In the first embodiment, fixed scheduling information is arranged in a multicast transmission frame in which packets for each service are arranged in a time division manner, and service-added scheduling information is arranged at a position corresponding to the packet for each service during a fixed period. This is an example.

  FIG. 3 is a block diagram illustrating a configuration of a packet receiving apparatus that receives a packet related to MBMS.

  In FIG. 3, the packet reception device 200 includes an antenna 201, a reception unit 202, a scheduling information determination unit 203, a scheduling information control unit 204, a reception control unit 205, and a data processing unit 206.

  The receiving unit 202 receives data transmitted from the base station apparatus, transfers the received data to the data processing unit 206, and outputs a control signal included in the data to the scheduling information determination unit 203. In addition, the reception unit 202 acquires its own receivable transfer rate and performs reception at the received receivable transfer rate. This is because HSDPA (High Speed Downlink Packet Access) compatible receiving terminals include, for example, those that can only receive up to 3 Mbps and those that can receive up to 14 Mbps, and their capabilities differ from one receiving terminal to another.

  The scheduling information determination unit 203 determines fixed scheduling information transmitted at fixed intervals from the MBMS service packet. The fixed scheduling information is scheduling information similar to that of the conventional technique that is transmitted once in 64 frames (640 ms), for example.

  The scheduling information control unit 204 controls to receive the service-added scheduling information to be viewed next in order to determine the service-added scheduling information added in association with the service from the MBMS service packet. The service-added scheduling information is scheduling information in which the control signal transmission interval is changed for each service, separately from the fixed scheduling information transmitted at a fixed interval. The service addition scheduling information is characterized in that it is added in relation to the service, and the transmission interval is also changed for each service. Since scheduling information is added as a basic unit of service, as described below, a flexible broadcast / multicast service can be provided while suppressing a decrease in transmission efficiency.

  The data processing unit 206 processes the packet data acquired from the receiving unit 202 according to the fixed scheduling information or the service additional scheduling information and outputs the packet data to the upper layer processing unit.

  Hereinafter, operations of the packet transmission device and the packet reception device configured as described above will be described.

  FIG. 4 is a diagram illustrating an example of scheduling information transmitted by the packet transmission apparatus according to the first embodiment.

  In FIG. 4, in a multicast transmission frame, for example, service 1 packet data (Service 1 data) 501 is transmitted in a section from time T = 262 to a length of 16 TTI and in a section from time T = 300 to a length of 16 TTI. In the interval from 278 to 16 TTI, service 2 packet data (Service 2 data) 502 is transmitted, and in the interval from time T = 508 to 8 TTI, service 3 packet data (Service 3 data) 503 is transmitted. .

  Then, scheduling information (fixed scheduling information) 601 is transmitted once in 64 frames (640 ms), and scheduling information (service additional scheduling information) 602 added for each service is transmitted. In the example of FIG. 4, service addition scheduling information 602 is added immediately after the packet data 502 of service 2.

  The fixed scheduling information 601 and the service additional scheduling information 602 both describe the MTCH transmission start time and the transmission length for each service. The fixed scheduling information 601 is the content described in the scheduling information shown in FIG. 10B, for example, and has been transmitted conventionally. The service addition scheduling information 602 is scheduling information newly provided in the present embodiment, and is added for each service. It is only necessary to be added in relation to the service, and it is not necessary to add to all services. Further, the position to be added is not limited, but it is preferably provided immediately after the packet data. In the example of FIG. 4, service addition scheduling information 602 is added immediately after the packet data 502 of service 2, and service addition scheduling information is not added to the packet data 501 of service 1 and the packet data 503 of service 3. Note that the service supplemental scheduling information 602 can be made unnecessary by optimizing the content of the fixed scheduling information 601. This will be described later with reference to FIGS.

  Now, among the packet data 501 of service 1, the packet data 502 of service 2, and the packet data 503 of service 3 transmitted in a multicast transmission frame, the packet data 501 of service 1 transmits a plurality of MTCHs at intervals shorter than 64 frames. Suppose the service you want to send. As shown in FIG. 4, only the fixed scheduling information 601 cannot transmit a plurality (two) of packet data 501 of service 1 at intervals shorter than 64 frames. In this embodiment, since the service additional scheduling information 602 is added at intervals shorter than 64 frames, the service additional scheduling information 602 is used to inform a more detailed position / length for each service, which is shorter than 64 frames. Multiple MTCHs can be transmitted. The content of the service additional scheduling information 602 includes information indicating the position / length of the scheduling information for each service and the next service additional scheduling information 602 read between the next fixed frames in addition to the content of the fixed scheduling information 601. .

  In this way, by adding the service additional scheduling information 602 for those that want to send a plurality of packet data at intervals shorter than 64 frames, while changing the transmission interval of scheduling information for each service and suppressing the decrease in transmission efficiency, A flexible broadcast / multicast service can be provided.

  Here, the service additional scheduling information 602 has the contents of the fixed scheduling information 601 and also has the position / length of its own service additional scheduling information 602 read between the next fixed frames. If the service additional scheduling information 602 can be captured, the fixed scheduling information 601 can be omitted. However, it is preferable to leave the fixed scheduling information 601 for the newly participating receiving terminals.

  As described above, according to the first embodiment, the scheduling information is changed for each service by arranging the service additional scheduling information 602 in the position corresponding to the packet for each service during the transmission period of the fixed scheduling information 601. Therefore, the timing for sending control information for each service can be changed. As a result, the scheduling content (position / length) of packets for each service can be notified at intervals shorter than 64 frames, and a plurality of pieces of data of desired services can be transmitted. In particular, it is not a mode in which the transmission period of fixed scheduling information is uniformly shortened, so that it is possible to prevent sending unnecessary information, prevent an increase in power consumption while maintaining transmission efficiency, and provide a flexible service. It can be carried out.

(Embodiment 2)
FIG. 5 is a diagram illustrating an example of scheduling information transmitted by the packet transmission device according to the second embodiment. In the description of the present embodiment, the same components as those in FIG.

  The configuration of the packet transmitting device and the packet receiving device according to the second embodiment is the same as or equivalent to the components shown in the first embodiment in FIGS.

  In FIG. 5, in a multicast transmission frame, for example, service 1 packet data (Service 1 data) 701 is transmitted in a section from time T = 256 to length 32 TTI, and service 2 is transmitted in a section from time T = 292 to length 16 TTI. Packet data (Service 2 data) 702 is transmitted, and packet data (Service 3 data) 703 of service 3 is transmitted in the section from time T = 508 to length 8 TTI.

  Then, scheduling information (Scheduling Information for All Service) 601 is transmitted once in 64 frames (640 ms), and scheduling information (service additional scheduling information) 801, 802, and 803 added for each service is transmitted. The second embodiment is characterized in that scheduling information 801, 802, and 803 are transmitted in the vicinity of packet data. Specifically, the service addition scheduling information (Scheduling Information for Service_1) 801 related to only the service 1 immediately after the packet data 701 of the service 1 and the service addition scheduling information (Scheduling information related to only the service 2 immediately after the packet data 702 of the service 2 are displayed. Information for Service_2) 802 is transmitted immediately after the packet data 703 of service 3, and additional scheduling information for service 3 (Scheduling Information for Service_3) 803 is transmitted. In other words, instead of a mode in which scheduling information for each service is transmitted collectively, scheduling information (Scheduling Information Service) is transmitted for each service.

  A control signal transmission method according to the second embodiment will be described. Service 1 data is transmitted by packet data (Service 1 data) 701 of service 1, and service additional scheduling information 801 relating to only service 1 is transmitted in the vicinity thereof. The receiving terminal receiving service 1 looks at this scheduling information 801 and knows the next transmission timing and length. Similarly, the receiving terminal receiving service 2 receives packet data 701 and scheduling information 802 of service 1 and prepares for the next reception. Here, the packet data 701 of service 1 and the scheduling information 801 may be transmitted at the same timing by using transport channel multiplexing (TrCH Multiplexing). The same applies to the packet data 702 and scheduling information 802 of service 2. Furthermore, scheduling information (Scheduling Information for All Service) 601 may be used to transmit scheduling information for all services for a receiving terminal that newly subscribes to the service as in the conventional example. In the case of a service in which the cycle and length of data are fixed, it is possible to eliminate the need to view the subsequent scheduling information 601 by informing the scheduling information 601 that it is a periodic signal.

  As described above, according to the second embodiment, scheduling information related to only the corresponding service is transmitted immediately after the packet data for each service, so that the time interval between the scheduling information and the data can be increased. In the meantime, other base stations can be monitored and reception can be stopped, so that the circuit scale and power consumption of the mobile device can be reduced. That is, in the conventional example, as shown in FIG. 12, when the scheduling information and the data transmission interval are close in time, reception of service 2 and sleep preparation and wakeup overlap, so that the receiving terminal receiving service 2 receives intermittent reception. I could not. On the other hand, in the second embodiment, as shown in FIG. 5, the next scheduling is transmitted by scheduling information 802 immediately after the service received by itself (service 2 in this case). The terminal can perform sleep preparation and wakeup during the period of service 1 without looking at the fixed scheduling information 601. The service 2 has been described above as an example, but the same applies to other services. In short, each receiving terminal can obtain the next scheduling information of the corresponding service immediately after the service received by the receiving terminal, and thus can know in advance for each service the timing at which the corresponding service comes. As a result, sleep preparation can be started until a service that the user does not need or a corresponding service arrives, and the power consumption can be further reduced.

(Embodiment 3)
FIG. 6 is a diagram illustrating an example of scheduling information transmitted by the packet transmission device according to the third embodiment. In the description of the present embodiment, the same components as those in FIG.

  The configuration of the packet transmitting apparatus and the packet receiving apparatus according to Embodiment 3 is the same as or equivalent to the components shown in FIGS. 1 to 3 (Embodiment 1), and thus description thereof is omitted.

  In FIG. 6 (a), in the multicast transmission frame, scheduling information (Scheduling Information for All Service) 901 is transmitted once in 64 frames (640 ms). In the third embodiment, unlike the fixed scheduling information 601 shown in FIGS. 4 and 5, the scheduling information 901 has contents for notifying a plurality of data locations at a time as shown in FIG. 6B. For example, as apparent from a comparison between FIG. 10B and FIG. 6B, the scheduling information 901 indicates a transmission location of a plurality of data in one scheduling information. For example, Scheduling Info at SFN 255 in FIG. 6B notifies that there is transmission between 16 frames from SFNS 262 and transmission between 16 frames from SFN 300 as scheduling information of MBMS Service 1. Thereby, even if the period of the fixed scheduling information 901 is 640 ms, the substantial data period can be shortened to 380 ms, so that a flexible service form can be adopted.

  Further, in the third embodiment, there is no need to change an existing radio communication system such as a control station apparatus and a mobile station apparatus, and there is an effect that the implementation is easy and can be realized at low cost.

  The above-described third embodiment can be applied to all scheduling information transmitted at a fixed period, and can also be applied to the control information transmission method according to the second and third embodiments. Thereby, data can be transmitted in a cycle shorter than the transmission cycle of control information, and further improvement in transmission efficiency and reduction in power consumption can be achieved.

(Embodiment 4)
FIG. 7 is a diagram illustrating an example of scheduling information transmitted by the packet transmission apparatus according to the fourth embodiment. In the description of the present embodiment, the same components as those in FIG.

  The configuration of the packet transmitting apparatus and the packet receiving apparatus according to the fourth embodiment is the same as or equivalent to the components shown in FIGS. 1 to 3 (Embodiment 1), and thus description thereof is omitted.

  In FIG. 7A, in a multicast transmission frame, scheduling information (Scheduling Information for All Service) 1001 is transmitted once in 64 frames (640 ms). In the fourth embodiment, unlike the fixed scheduling information 601 shown in FIGS. 4 and 5, the scheduling information 1001 has a content for notifying the transmission cycle as shown in FIG. 7B. For example, in Scheduling Info at SFN 255 in FIG. 7B, as the scheduling information of MBMS Service 1, the transmission between 32 frames from SFNS 256 and the fact that its period is Periodic 64 is notified. As a result, by notifying the periodic service, it is possible to reduce power consumption of the mobile terminal because it is not necessary to view subsequent control signals when data is transmitted periodically.

  Further, in the fourth embodiment, there is no need to change an existing wireless communication system such as a control station device and a mobile station device, and there is an effect that the implementation is easy and can be realized at low cost.

  The above-described fourth embodiment can be applied to all scheduling information transmitted at a fixed period, and can also be applied to the control information transmission method according to the first to third embodiments. Thereby, it is possible to further improve transmission efficiency and reduce power consumption.

  The above description is an illustration of a preferred embodiment of the present invention, and the scope of the present invention is not limited to this.

  In the above embodiments, the names packet transmitting device, packet receiving device, and packet transmitting method are used. However, this is for convenience of explanation, and it is of course possible to use a mobile terminal, a wireless communication device, a packet receiving method, or the like. It is.

  Further, the type, number, connection method, and the like of each circuit unit constituting the packet transmission device and the packet reception device are not limited to the above-described embodiments.

  The packet transmission method described above is also realized by a program for causing this transmission method to function. This program is stored in a computer-readable recording medium.

  INDUSTRIAL APPLICABILITY The packet transmission apparatus and the packet transmission method according to the present invention have an effect of suppressing a decrease in throughput of the entire system, and are particularly useful in a wireless communication system to which an HSDPA scheme that communicates packets at high speed via a wireless line is applied. .

FIG. 1 is a block diagram showing a configuration of a packet transmission apparatus according to Embodiment 1 of the present invention. The block diagram which shows the structure of the data generation part of the packet transmitter which concerns on the said Embodiment 1. FIG. Block diagram showing a configuration of a packet receiving apparatus according to the first embodiment The figure which shows an example of the scheduling information which the packet transmitter which concerns on the said Embodiment 1 transmits. The figure which shows an example of the scheduling information which the packet transmitter which concerns on Embodiment 2 of this invention transmits. The figure which shows an example of the scheduling information which the packet transmitter which concerns on Embodiment 3 of this invention transmits. The figure which shows an example of the scheduling information which the packet transmitter which concerns on Embodiment 4 of this invention transmits. The figure which shows the structural example of the conventional packet transmitter. The figure explaining the conventional packet transmission method The figure which shows the structure of Scheduling Information in MBMS The figure which shows an example of the scheduling information transmitted at the conventional fixed interval The figure which shows an example of the scheduling information transmitted at the conventional fixed interval

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Control station apparatus 110 Control part 120 Data generation part 121 Buffer 122 Scheduling part 123 Data assembly part 150 Base station apparatus 200 Packet receiving apparatus 201 Antenna 202 Receiving part 203 Scheduling information judgment part 204 Scheduling information control part 205 Reception control part 206 Data processing Part

Claims (4)

In a multicast transmission frame in which packets for each service are arranged in a time-sharing manner, first scheduling information indicating the scheduling contents of the packets for each service is arranged every fixed period, and packets for each service are arranged during the fixed period. Placing means for placing the second scheduling information at a position corresponding to
A packet transmission apparatus comprising: a transmission unit configured to transmit a packet for each of the arranged services and the first and second scheduling information to a mobile station apparatus.   The arrangement means extracts the scheduling information of each service from the acquired scheduling information, and arranges the scheduling information extracted for each service at the position corresponding to the packet for each service as the second scheduling information. The packet transmission device according to claim 1, wherein:   The packet transmission device according to claim 1 or 2, wherein the arrangement unit arranges the second scheduling information immediately after the packet for each service. Obtaining scheduling information indicating scheduling contents of packets for each service;
In the multicast transmission frame in which the packets for each service are arranged in a time-sharing manner, arranging the first scheduling information for each fixed period;
Placing second scheduling information in a position corresponding to the packet for each service during the fixed period;
A packet transmission method comprising: transmitting a packet for each of the arranged services, and the first and second scheduling information to a mobile station apparatus.

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