JP2005006293A - Mobile packet communication method, base station, and mobile station - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mobile packet communication method, a base station, and a mobile station in which efficient scheduling and radio resource allocation can be performed in an upward high-speed mobile packet communication system. <P>SOLUTION: In the mobile packet communication system for performing packet communication between a mobile station 30 and a base station 10, the base station manages a transmission amount of packets stored in a transmission buffer 35 of the mobile station 30 and each time the amount of packets stored in the transmission buffer 35 of the mobile station 30 is changed, the mobile station 30 notifies the base station 10 of the changed result of the relevant packet amount. In accordance with the notified changed result of the packet amount, the base station 10 increases/decreases the amount of packets stored in the transmission buffer corresponding to the mobile station 30. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a packet mobile communication method for performing packet communication between a mobile station and a base station, a base station, and a mobile station.

  Conventionally, in 3GPP (3rd Generation Partnership Project), the “High Speed Downlink Packet Access (HSDPA)” method, which is a high-speed packet mobile communication method in the downlink direction, has been formally specified.

  Specifically, “RR (Round Robin)”, “Max C / I (Maximum Carrier / Interference)”, “Hybrid Scheduling”, etc. have been proposed as scheduling in the high-speed packet mobile communication system in the downlink direction (for example, Non-patent documents 1 and 2).

  As described above, in the downlink high-speed packet mobile communication system, since the transmission buffer (queue, queue) of each mobile station is provided in the base station, the base station determines the arrival time and transmission of the downlink packet. Efficient scheduling considering the size of the buffer (queue length) and the like is possible (for example, see Patent Document 2).

On the other hand, in the conventional high-speed packet mobile communication system in the uplink direction, each mobile station has a transmission buffer in each mobile station. A method of periodically reporting to a base station has been proposed (see, for example, Patent Document 2).
3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Physical Layer Aspects of UTRA High Speed Downlink Packet Access (Release 2000), 3G TR25.848, V0.2.0 (2000-05), http: //www.3gpp .org Chen Arashi, Hidetoshi Kayama, Narumi Umeda, “Wireless QoS Control in CDMA High-Speed Wireless Packet System”, IEICE, IEICE Technical Report, RCS 2002-208 (2003-01) Japanese Patent Application No. 2002-291581 Japanese Patent Application No. 2002-358302

  However, the conventional uplink high-speed packet mobile communication system has a problem that each mobile station has a large number of “required notification bits” for reporting the amount of packets in the transmission buffer, resulting in a decrease in system efficiency due to a control load. was there.

  In addition, in the conventional high-speed packet mobile communication system in the upstream direction, the dynamic change in the amount of packets in the transmission buffer due to the generation of packets to be transmitted or the discarding of packets cannot be reflected in real time on the base station side. However, there is a problem in that efficient scheduling cannot be performed and useless radio resource allocation occurs, leading to QoS degradation in the system.

  The present invention has been made in view of the above points. A packet mobile communication method, a base station, and a mobile station capable of performing efficient scheduling and radio resource allocation in an uplink high-speed packet mobile communication system The purpose is to provide.

  A first feature of the present invention is a packet mobile communication method for performing packet communication between a mobile station and a base station, wherein the base station indicates the amount of packets stored in a transmission buffer of the mobile station Managing the transmission buffer accumulated packet amount, and the mobile station notifies the base station of the change result of the packet amount each time a change occurs in the packet amount accumulated in the transmission buffer of the mobile station, The gist of the base station is to increase or decrease the amount of packets stored in the transmission buffer corresponding to the mobile station according to the notified change result of the packet amount.

  According to this invention, each time the mobile station changes the packet amount stored in the transmission buffer, the base station notifies the base station of the change result of the packet amount. It is possible to grasp the dynamic change of the packet amount in real time.

  Further, according to the invention, since the mobile station notifies the base station of the packet amount change result that requires a small amount of data, it is possible to prevent an increase in traffic volume between the mobile station and the base station, and Since the base station only increases or decreases the packets in the virtual buffer corresponding to the mobile station in accordance with the change result of the packet amount, it is possible to prevent the system efficiency from being lowered due to the control load.

  A second feature of the present invention is a base station that performs packet communication with a mobile station, and manages a transmission buffer accumulated packet amount indicating a packet amount accumulated in a transmission buffer of the mobile station The management unit increases or decreases the transmission buffer accumulated packet amount corresponding to the mobile station according to a change result of the packet amount accumulated in the transmission buffer of the mobile station notified from the mobile station. The gist is to do.

  According to this invention, the management unit increases or decreases the packet amount in the virtual buffer corresponding to the mobile station according to the change result of the packet amount notified from the mobile station, so the mobile station in real time with a small control load. Can follow the change in the amount of packets in the transmission buffer.

  In the second aspect of the present invention, the management unit manages a virtual buffer that stores the amount of packets stored in the transmission buffer, and is stored in the transmission buffer of the mobile station notified from the mobile station. It may be configured to increase or decrease the number of packets in the virtual buffer corresponding to the mobile station according to a change result of the amount of packets that are present.

  According to this invention, the resource allocation unit refers to the virtual buffer corresponding to the mobile station and allocates radio resources used for uplink packet communication with the mobile station. The change in quantity can be grasped in real time, and efficient scheduling can be performed.

  In the second aspect of the present invention, a configuration is provided that includes a resource allocation unit that allocates radio resources used for uplink packet communication with the mobile station with reference to the virtual buffer corresponding to the mobile station. May be.

  In the second aspect of the present invention, the management unit may be configured to increase or decrease packets in the virtual buffer corresponding to the mobile station according to radio resource allocation by the resource allocation unit. .

  In the second aspect of the present invention, when the management unit receives a packet transmitted from the mobile station, the management unit may be configured to reduce the number of packets successfully received from the virtual buffer. .

  In the second feature of the present invention, when the change result of the packet amount stored in the transmission buffer of the mobile station notified from the mobile station indicates an increase amount of packets in the transmission buffer, the management The unit may be configured to add a packet corresponding to the increase amount to the virtual buffer and manage the added packet and the addition time of the packet in association with each other.

  In the second aspect of the present invention, the management unit may be configured to delete a packet in the virtual buffer that has passed a predetermined time from the addition time.

  In the second aspect of the present invention, the management unit manages the added packet in association with the communication quality information of the packet notified from the mobile station, and the communication quality information of the packet Based on this, a scheduling unit may be configured to perform scheduling for allocation of radio resources used for uplink packet communication with the mobile station.

  A third feature of the present invention is a mobile station that performs packet communication with a base station, the transmission buffer storing packets to be transmitted to the base station, and the transmission buffer. The gist of the present invention is to provide a notification unit that notifies the base station of the change result of the packet amount every time the packet amount changes.

  In the third aspect of the present invention, when a packet to be transmitted to the base station is generated, the notifying unit sets the number of generated packets to the base station as an increase amount of packets in the transmission buffer. It may be configured to notify.

  In the third aspect of the present invention, when the packet in the transmission buffer is discarded, the notification unit notifies the base station of the number of discarded packets as a decrease amount of the packet in the transmission buffer. It may be configured.

  In the third aspect of the present invention, when the notification unit successfully transmits a packet to the base station, the notification unit notifies the base station of the number of packets successfully transmitted as a decrease amount of the packet in the transmission buffer. It may be configured to.

  In the third aspect of the present invention, when the notification unit generates a packet to be retransmitted to the base station, the notification unit sets the number of generated packets to the base station as an increase amount of packets in the transmission buffer. It may be configured to notify.

  As described above, according to the present invention, there is provided a packet mobile communication method, a base station, and a mobile station capable of performing efficient scheduling and radio resource allocation in an uplink high-speed packet mobile communication system. be able to.

(Configuration of the first embodiment of the present invention)
The configurations of a base station and a mobile station that implement the packet mobile communication method according to the first embodiment of the present invention will be described with reference to FIG. 1 and FIG. FIG. 1 shows functional blocks of the base station 10 according to the present embodiment, and FIG. 2 shows functional blocks of the mobile station 30 according to the present embodiment.

  As illustrated in FIG. 1, the base station 10 according to the present embodiment includes a reception unit 11, a reservation recognition unit 12, a virtual buffer management unit 13, a resource allocation unit 14, and a transmission unit 15.

  The receiving unit 11 receives an uplink packet from the mobile station 30 via a common packet channel CPCH (Common Packet Channel), or receives an “number of packets” via an uplink dedicated control channel DCCH (Dedicated Control Channel). "Change result (packet amount change result)" or "packet communication quality information" or the like.

  Here, the “change result of the number of packets” is “plus reservation” indicating the number of packets increased in the transmission buffer 35 of the mobile station 30 (the increase amount of packets in the transmission buffer 35), or the transmission buffer of the mobile station 30 35 is one of “minus reservation” indicating the number of packets decreased in 35 (the amount of decrease in packets in the transmission buffer 35).

  For example, “plus reservation” including information “+2” indicates that the number of packets has increased by “2” in the transmission buffer 35 of the mobile station 30, and “minus reservation” including information “−1” is In the transmission buffer 35 of the mobile station 30, the number of packets is reduced by “1”.

  The reservation recognizing unit 12 recognizes a change result (“plus reservation” or “minus reservation”) of the number of packets notified from the mobile station 30. Further, the reservation recognition unit 12 notifies the recognition result to the virtual buffer management unit 13.

  The reservation recognition unit 12 is configured to notify the virtual buffer management unit 13 of the arrival time of the change result of the number of packets when the change result of the number of packets transmitted from each mobile station 30 is “plus reservation”. May be.

The virtual buffer management unit 13 manages the transmission buffer accumulated packet amount indicating the number of packets (packet amount) accumulated in the transmission buffer 35 of each mobile station 30 _{1 to} 30 _n .

In addition, the virtual buffer management unit 13 changes the number of packets accumulated in the transmission buffer 35 of each mobile station 30 _{1 to} 30 _n notified from each mobile station 30 _{1 to} 30 _n (“plus reservation” or “ The transmission buffer storage packet amount corresponding to each mobile station 30 _{1 to} 30 _n is increased or decreased in accordance with “minus reservation”).

Specifically, the virtual buffer managing unit 13 manages the virtual buffer 13 ₁ to 13 _n corresponding to each mobile station 30 ₁ to 30 _n, the transmission buffer storage corresponding to each mobile station 30 ₁ to 30 _n The packet amount (the number of packets stored in the transmission buffer 35 of each mobile station 30 _{1 to} 30 _n ) is stored in the respective virtual buffers 13 _{1 to} 13 _n .

In addition, the virtual buffer management unit 13 changes the number of packets accumulated in the transmission buffer 35 of each mobile station 30 _{1 to} 30 _n notified from each mobile station 30 _{1 to} 30 _n (“plus reservation” or “ In accordance with “minus reservation”), the packets in the virtual buffers 13 _{1 to} 13 _n corresponding to the mobile stations 30 _{1 to} 30 _n are increased or decreased (added or deleted).

In the example of FIG. 1, the virtual buffer management unit 13 stores four packets (packets # 1 to # 4) in the virtual buffer 13 ₁ for the mobile station 30 ₁ , and the virtual buffer for the mobile station 30 _n . in 13 _n, it accumulates two packets (packets # 1 and # 2).

Virtual buffer management unit 13, when receiving the notification of the reception of the "plus reservation (+2)" from the mobile station 30 _n from the reservation recognizing unit 12, add the 2 packets to the virtual buffer 13 _n for the mobile station 30 _n To do.

On the other hand, the virtual buffer managing unit 13, when receiving the notification of the reception of the "plus reservation (-1)" from the mobile station 30 ₁ from the reservation recognizing unit 12, from the virtual buffer 13 ₁ for the mobile station 30 ₁ 1 Delete the packet. Here, the virtual buffer managing unit 13 is configured to delete the order from the head of the packet # 1 in the virtual buffer 13 _1.

When a new packet is added to the virtual buffers 13 _{1 to} 13 _n , the virtual buffer management unit 13 may be configured to store the packet to be added and the addition time of the packet in association with each other.

  Here, since the time spent from receiving the above packet number change result to adding a packet to the virtual buffer is very small, the virtual buffer management unit 13 is notified from the reservation recognition unit 12 " The “arrival time of the change result of the number of packets” may be the above-described “packet addition time”.

  Further, the size of the virtual buffer managed by the virtual buffer management unit 13 may be configured to be the same for each mobile station 30 or may be stored in the transmission buffer of each mobile station 30. It may be configured to be changed in accordance with the number of packets being received.

  The resource allocation unit 14 refers to a virtual buffer corresponding to the mobile station 30 and allocates radio resources used for uplink packet communication with the mobile station 30.

  For example, the resource allocation unit 14 sequentially uses radio resources (for example, a radio channel number, a code number, and a transmission timing) used for uplink packet communication in order from the first packet in the virtual buffer managed by the virtual buffer management unit 13. Etc.) can be assigned.

  The transmission unit 15 notifies the mobile station 30 of the radio resource allocated by the resource allocation unit 14 via the downlink dedicated control channel DCCH.

  As shown in FIG. 2, the mobile station 30 includes a reception unit 31, a reservation response recognition unit 32, a determination unit 33, a reservation unit 34, a transmission buffer 35, and a transmission unit 36.

  The receiving unit 31 receives notification of radio resources allocated by the resource allocation unit 14 from the base station 10 via the downlink dedicated control channel DCCH.

  The reservation response recognition unit 32 instructs the transmission unit 36 to transmit an uplink packet using the radio resource notified by the resource allocation unit 14 (for example, a radio channel number, a code number, transmission timing, etc.). To do.

  The determination unit 33 determines whether a packet to be transmitted to the base station 10 has occurred, whether the packet has been discarded in the transmission buffer 35, whether the packet has been successfully transmitted to the base station 10, Judgment is made on the fact such as whether or not a packet to be retransmitted to the station 10 has occurred (whether or not transmission of the packet to the base station 10 has failed), and the number of packets in the transmission buffer 35 changes according to the above facts If so, the result of the change is acquired.

  The reservation unit 34 creates a “packet number change result” that is either “plus reservation” or “minus reservation” based on the result acquired by the determination unit 33.

  When a packet to be transmitted to the base station 10 is generated, the reservation unit 34 creates a “plus reservation” including the number of generated packets as the increase number (increase amount) of packets in the transmission buffer 35.

  In addition, when the packet in the transmission buffer 35 is discarded, the reservation unit 34 creates a “minus reservation” including the number of discarded packets as the number of decrease (decrease amount) of the packets in the transmission buffer 35.

  The transmission buffer 35 accumulates packets to be transmitted to the base station 10. The transmission buffer 35 may be configured to store the generated packets in a format that is inserted into a queue according to a predetermined scheduling method. Further, the transmission buffer 35 may be configured to discard a packet that has passed for a predetermined period from the start of accumulation, a packet that has been retransmitted a predetermined number of times, a packet that has been subjected to transmission cancellation processing by the user, or the like. Good.

  The transmission unit 36 transmits the packets stored in the transmission buffer 35 to the base station 10 via the uplink common packet channel CPCH. Here, the transmission unit 36 transmits the packet using the radio resource instructed from the reservation response recognition unit 32.

  In addition, the transmission unit 36 transmits the “change result of the number of packets” of “plus reservation” or “minus reservation” created by the reservation unit 34 to the base station 10 via the uplink dedicated control channel DCCH. .

  In addition, the transmission unit 36 sets the number of packets accumulated in the transmission buffer 35 at regular intervals in order to synchronize between the transmission buffer 35 and the virtual buffer in the virtual buffer management unit 13 of the base station 10. It may be configured to transmit to the base station 10.

  In this embodiment, every time the determination unit 33, the reservation unit 34, and the transmission unit 36 change the number of packets stored in the transmission buffer 35, a notification that notifies the base station 10 of the change result of the number of packets. Parts.

(Operation of the first embodiment of the present invention)
First, the operation of the mobile station 30 according to the present embodiment will be described with reference to FIG.

  In step 101, the determination unit 33 of the mobile station 30 determines whether or not a packet to be transmitted to the base station 10 has occurred by monitoring a user input operation or the like. This operation proceeds to step 104 in the case of YES, and proceeds to step 102 in the case of NO.

  In step 102, the determination unit 33 of the mobile station 30 monitors the transmission buffer 35, so that a packet that has elapsed for a predetermined period from the start of accumulation, a packet that has been retransmitted a predetermined number of times, or a transmission cancellation process by the user. Judgment is made as to whether or not discard of the performed packet or the like has occurred. This operation proceeds to step 105 if YES, and proceeds to step 103 if NO.

  In step 103, the determination unit 33 of the mobile station 30 monitors the transmission unit 36 to determine whether the packet transmission to the base station 10 has been successful. Specifically, the determination unit 33 of the mobile station 30 determines that the transmission of the packet to the base station 10 is successful when the transmission unit 36 receives an ACK from the base station 10. This operation proceeds to step 105 if YES, and returns to step 101 if NO.

  In step 104, the reservation unit 34 of the mobile station 30 creates “plus reservation” including the number of packets generated as packets to be transmitted to the base station 10 as the number of packets in the transmission buffer 35.

  In step 105, the reservation unit 34 of the mobile station 30 creates a “minus reservation” including the number of discarded packets or the number of successfully transmitted packets as the number of packets in the transmission buffer 35.

  In step 106, the transmission unit 36 of the mobile station 30 transmits the “plus reservation” or “minus reservation” created by the reservation unit 34 to the base station 10 via the uplink dedicated control channel DCCH.

  The mobile station 10 is configured to repeat the processing of steps 101 to 106 at a predetermined cycle. Further, the mobile station 10 may be configured to perform the processing of steps 101 to 103 in parallel.

  2ndly, with reference to FIG. 4, operation | movement of the base station 10 which concerns on this embodiment is demonstrated.

  In step 201, the receiving unit 11 of the base station 10 determines whether or not the “change result of the number of packets” has been received from the mobile station 30 by monitoring the uplink dedicated control channel DCCH.

  When it is determined that the “result of change in the number of packets” has been received from the mobile station 30, in step 202, the reservation recognition unit 12 of the base station 10 receives the “result of change in the number of packets” as “plus reservation”. Or “minus reservation”.

  If it is determined that it is “minus reservation”, in step 203, the virtual buffer management unit 13 of the base station 10 stores the “minus reservation” in the “minus reservation” from the virtual buffer for the mobile station 30 that transmitted the “minus reservation”. The packet corresponding to the decrease number of packets is deleted.

  On the other hand, if it is determined to be “plus reservation”, the virtual buffer management unit 13 of the base station 10 stores the reception time (arrival time) of the “plus reservation” in step 204, and in step 205 Packets corresponding to the increased number of packets in the “plus reservation” are added to the virtual buffer for the mobile station 30 that has transmitted “plus reservation” in association with the above arrival time.

  Third, an example of the packet mobile communication method according to the present embodiment will be described with reference to FIG.

  In step 1001, the determination unit 33 of the mobile station 30 detects that two packets to be transmitted to the base station 10 are generated, and the reservation unit 34 of the mobile station 30 determines that the number of packets in the transmission buffer 35 is two. A “plus reservation (+2)” including information that the number has been increased is created.

  In step 1002, the transmission unit 36 of the mobile station 30 transmits the “plus reservation (+2)” to the base station 10 via the uplink dedicated control channel DCCH.

  In step 1003, the reservation recognition unit 12 of the base station 10 notifies the virtual buffer management unit 13 of the received “plus reservation (+2)” and the arrival time of the “plus reservation (+2)”.

  In step 1004, the virtual buffer management unit 13 adds two packets to the virtual buffer for the mobile station 30 in response to the notification from the reservation recognition unit 12. Here, the virtual buffer management unit 13 may be configured to store the added two packets in association with the arrival time of the above-described “plus reservation (+2)” as the addition time of the two packets.

  In step 1005, the resource allocation unit 14 assigns radio resources (for example, radio channel number, code number, transmission timing, etc.) based on the virtual buffer corresponding to the mobile station 30 managed by the virtual buffer management unit 13. assign. In the example of FIG. 5, the resource allocation unit 14 allocates radio resources for 3 packets.

  In Step 1006, the transmission unit 15 of the base station 10 transmits the radio resource allocated by the resource allocation unit 14 to the mobile station 30 via the downlink dedicated control channel DCCH.

  In step 1007, the transmission unit 36 of the mobile station 30 transmits three packets to the base station 10 via the uplink common packet channel CPCH using the radio resource indicated by the reservation response recognition unit 32. Then, the determination unit 33 of the mobile station 30 detects that the number of packets in the transmission buffer 35 has decreased by three as a result of the successful transmission of 3 packets, and the reservation unit 34 of the mobile station 30 “Minus reservation (−3)” including information that the number of packets has decreased by three is created.

  In step 1008, the transmission unit 36 of the mobile station 30 transmits the “minus reservation (−3)” to the base station 10 via the uplink dedicated control channel DCCH.

  In step 1009, the reservation recognition unit 12 of the base station 10 notifies the virtual buffer management unit 13 that “minus reservation (−3)” has been received. Then, the virtual buffer management unit 13 reduces 3 packets from the virtual buffer for the mobile station 30 in response to the notification from the reservation recognition unit 12.

  In step 1010, the transmission buffer 35 of the mobile station 30 discards the two packets that have passed for a predetermined period from the start of accumulation. Then, the determination unit 33 of the mobile station 30 detects that the number of packets in the transmission buffer 35 has decreased by two as a result of discarding two packets, and the reservation unit 34 of the mobile station 30 A “minus reservation (−2)” including information that the number of packets has decreased by two is created.

  In step 1011, the transmission unit 36 of the mobile station 30 transmits the “minus reservation (−2)” to the base station 10 via the uplink dedicated control channel DCCH.

  In step 1012, the reservation recognition unit 12 of the base station 10 notifies the virtual buffer management unit 13 that “minus reservation (−2)” has been received. Then, the virtual buffer management unit 13 reduces two packets from the virtual buffer for the mobile station 30 in response to the notification from the reservation recognition unit 12.

(Operation and effect of the first embodiment of the present invention)
According to the packet mobile communication method according to the present embodiment, every time the mobile station 30 changes a packet stored in the transmission buffer 35, a change result of the number of packets (“plus reservation” or “minus reservation”). To the base station 10, the base station 10 can grasp the dynamic change of the transmission buffer 35 of the mobile station 30 in real time.

  Further, according to the packet mobile communication method according to the present embodiment, the mobile station 30 notifies the base station 10 of the change result of the number of packets that requires a small amount of data. An increase in traffic volume can be prevented, and the base station 10 only increases or decreases the number of packets in the virtual buffer corresponding to the mobile station 30 in accordance with the result of the change in the number of packets described above. Can also be prevented.

  Also, according to the packet mobile communication method according to the present embodiment, the virtual buffer management unit 13 determines the packet in the virtual buffer corresponding to the mobile station 30 according to the change result of the number of packets notified from the mobile station 30. Since it increases or decreases, it is possible to follow the change of the transmission buffer 35 in the mobile station 30 in real time with a small control load.

  Further, according to the packet mobile communication method according to the present embodiment, the resource allocation unit 14 refers to the virtual buffer corresponding to the mobile station 30 and uses the radio resource for uplink packet communication with the mobile station 30. Therefore, a change in the transmission buffer 35 of the mobile station 30 can be grasped in real time, and efficient scheduling can be performed.

(Second embodiment of the present invention)
A second embodiment of the present invention will be described with reference to FIGS. Hereinafter, the difference between the present embodiment and the first embodiment will be mainly described.

  The virtual buffer management unit 13 of the base station 10 according to the present embodiment increases or decreases the packets in the virtual buffer corresponding to the mobile station 30 according to the radio resource allocation by the resource allocation unit 14. For example, when the virtual buffer management unit 13 assigns a radio resource to a packet in a virtual buffer of a specific mobile station 30, the virtual buffer management unit 13 selects a packet to which the radio resource is assigned from the virtual buffer corresponding to the mobile station 30. Configured to reduce.

  In addition, the reservation unit 34 of the mobile station 30 increases the number of packets in the transmission buffer 35 when a packet to be retransmitted to the base station 10 occurs (when transmission of the packet to the base station 10 fails). The “plus reservation” including the number of generated retransmission packets is created.

  With reference to FIG. 6, the operation of the mobile station 30 according to the present embodiment will be described.

  In step 301, the determination unit 33 of the mobile station 30 determines whether or not a packet to be transmitted to the base station 10 has occurred by monitoring a user input operation or the like. This operation proceeds to step 304 in the case of YES, and proceeds to step 302 in the case of NO.

  In step 302, the determination unit 33 of the mobile station 30 monitors the transmission buffer 35, so that a packet that has been stored for a predetermined period of time after starting accumulation, a packet that has been retransmitted a predetermined number of times, or a transmission cancellation process by the user. Judgment is made as to whether or not discard of the performed packet or the like has occurred. This operation proceeds to step 305 in the case of YES, and proceeds to step 303 in the case of NO.

  In step 303, the determination unit 33 of the mobile station 30 monitors the transmission unit 36 to determine whether or not a packet to be retransmitted has occurred for the base station 10. Specifically, the determination unit 33 of the mobile station 30 determines that a packet to be retransmitted to the base station 10 has occurred when the transmission unit 36 receives a NACK from the base station 10. This operation proceeds to step 304 if YES, and returns to step 301 if NO.

  In step 304, the reservation unit 34 of the mobile station 30 sets the number of packets generated as packets to be transmitted to the base station 10 or the packets to be retransmitted to the base station 10 as the number of packets in the transmission buffer 35 increased. Create a “plus reservation” that includes the number of packets generated as

  In step 305, the reservation unit 34 of the mobile station 30 creates a “minus reservation” that includes the number of discarded packets as the number of decrease of packets in the transmission buffer 35.

  In step 306, the transmission unit 36 of the mobile station 30 transmits the “plus reservation” or “minus reservation” created by the reservation unit 34 to the base station 10 via the uplink dedicated control channel DCCH.

  The mobile station 10 is configured to repeat the processing of steps 301 to 306 at a predetermined cycle. Further, the mobile station 10 may be configured to perform the processing of steps 301 to 303 in parallel.

  With reference to FIG. 7, the operation of the base station 10 according to the present embodiment will be described. Here, steps 401 to 405 perform the same processing as steps 201 to 205 shown in FIG.

  In step 406, the virtual buffer management unit 13 of the base station 10 determines whether or not radio resources are allocated by the resource allocation unit 14 to the packets stored in the virtual buffer for the mobile station 30.

  When it is determined that radio resources have been allocated, the virtual buffer management unit 13 of the base station 10 deletes packets corresponding to the number of packets to which radio resources have been allocated from the virtual buffer for the mobile station 30.

  On the other hand, when it is determined that no radio resource is allocated, the operation returns to step 401.

  With reference to FIG. 8, an example of the packet mobile communication method according to the present embodiment will be described. Here, steps 2001 to 2005 perform the same processing as steps 1001 to 1005 shown in FIG.

  In step 2006, the virtual buffer management unit 13 of the base station 10 reduces the number of packets corresponding to the number of packets to which the resource allocation unit 14 has allocated radio resources from the virtual buffer in the example of FIG.

  In step 2007, the transmission unit 15 of the base station 10 notifies the mobile station 30 of the radio resources (including the transmission timing) allocated by the resource allocation unit 14 via the downlink dedicated control channel DCCH.

  In step 2008, the transmission unit 36 of the mobile station 30 attempts to transmit three packets to the base station 10 via the uplink common packet channel CPCH using the radio resource indicated by the reservation response recognition unit 32. , Send fails. Specifically, the transmission unit 36 of the mobile station 30 receives NACK from the base station 10 for the transmitted packet.

  Here, as a result of the failure of the transmission of the three packets by the determination unit 33 of the mobile station 30, three packets to be retransmitted are generated in the transmission buffer 35, that is, the number of packets in the transmission buffer 35 is 3. The reservation unit 34 of the mobile station 30 creates “plus reservation (+3)” including information that the number of packets in the transmission buffer 35 has increased by three.

  In step 2009, the transmission unit 36 of the mobile station 30 transmits the “plus reservation (+3)” to the base station 10 via the uplink dedicated control channel DCCH.

  In step 2010, the reservation recognition unit 12 of the base station 10 notifies the virtual buffer management unit 13 of the received “plus reservation (+3)” and the arrival time of the “plus reservation (+3)”. Then, the virtual buffer management unit 13 adds three packets to the virtual buffer for the mobile station 30 in response to the notification from the reservation recognition unit 12. Here, the virtual buffer management unit 13 may be configured to store the added packet in association with the arrival time of the above-described “plus reservation (+3)” as the addition time of the packet.

(Third embodiment of the present invention)
A third embodiment of the present invention will be described with reference to FIGS. Hereinafter, the difference between the present embodiment and the first embodiment will be mainly described.

  The base station 10 according to the present embodiment includes a scheduling unit 16, a traffic type recognizing unit 17, and a propagation path state recognizing unit 18 in addition to the configuration of the base station 10 according to the first embodiment described above. .

  The virtual buffer management unit 13 accumulates packets in which the addition time and communication quality information (described later) are associated with each other in the virtual buffer for each mobile station 30. That is, when a new packet is added to the virtual buffer, the virtual buffer management unit 13 is configured to store the packet to be added, the addition time of the packet, and the communication quality information of the packet in association with each other. ing.

  Here, the communication quality information of the packet is information related to communication quality (QoS) such as traffic types such as real-time traffic “A” and non-real-time traffic “B”, and allowable residence time for each traffic type.

  In addition, when receiving a packet transmitted from the mobile station 30, the virtual buffer management unit 13 is configured to increase or decrease the number of packets in the virtual buffer for the mobile station 30 according to the number of packets successfully received. ing.

  That is, the virtual buffer management unit 13 reduces, from the virtual buffer for the mobile station 30, packets corresponding to the number of packets transmitted from the mobile station 30 via the uplink common packet channel CPCH and received by the reception unit 11.

  Further, the virtual buffer management unit 13 is configured to delete a packet that has passed a predetermined time from the addition time in the virtual buffer. Specifically, the virtual buffer management unit 13 is configured to refer to the allowable residence time for each traffic type of each packet and reduce packets that exceed the allowable residence time.

  The scheduling unit 16 refers to the virtual buffer managed by the virtual buffer management unit 13, and performs uplink packet communication with the mobile station 30 based on the packet addition time and the communication quality information of the packet. Scheduling for allocation of radio resources used in

  In addition, the scheduling unit 16 assigns radio resources to be used for uplink packet communication with the mobile station 30 according to the propagation status with the mobile station 30 recognized by the propagation path status recognition unit 18. Scheduling can also be performed.

  For example, the scheduling unit 16 performs, for a packet with high priority (for example, high real-time property) on the basis of “packet communication quality information (traffic type)” associated with each packet in the virtual buffer. The virtual buffers are rearranged so that radio resources are allocated first.

  Further, the scheduling unit 16 may be configured to reduce specific packets when the propagation status with the mobile station 30 is poor.

  The traffic type recognition unit 17 recognizes the communication quality information of the packet transmitted from the mobile station 30 together with the change result of the number of packets, and notifies the virtual buffer management unit 13 of the recognition result.

  The propagation path state recognition unit 18 recognizes the propagation state with the mobile station 30 using the reception state of the pilot signal from the mobile station 30 and the like. The propagation path status recognition unit 18 notifies the scheduling unit 16 of the propagation status with the mobile station 30.

  Further, the determination unit 33 of the mobile station 30 according to the present embodiment determines only the fact whether or not a packet to be transmitted to the base station 10 has occurred. That is, the determination unit 33 does not determine whether a packet to be retransmitted has occurred for the base station 10 or whether the packet has been discarded in the transmission buffer 35.

  In addition, the reservation unit 34 of the mobile station 30 sets “plus reservation” including the number of generated packets as an increase in the number of packets in the transmission buffer 35 only when a packet to be transmitted to the base station 10 is generated. Configured to create. That is, the reservation unit 34 creates a “plus reservation” that includes the number of retransmission packets that have occurred as the number of packets in the transmission buffer 35 even when a packet to be retransmitted to the base station 10 has occurred. Even if a packet is discarded in the transmission buffer 35, a “minus reservation” including the number of discarded packets is not created as the number of packets decreased in the transmission buffer 35.

  With reference to FIG. 10, the operation of the mobile station 30 according to the present embodiment will be described.

  In step 501, the determination unit 33 of the mobile station 30 determines whether or not a packet to be transmitted to the base station 10 has occurred by monitoring a user input operation or the like. This operation proceeds to step 502 if YES, and repeats step 501 if NO.

  In step 502, the reservation unit 34 of the mobile station 30 creates a “plus reservation” including the number of packets generated as packets to be transmitted to the base station 10 as the number of packets in the transmission buffer 35.

  In Step 503, the transmission unit 36 of the mobile station 30 transmits the “plus reservation” created by the reservation unit 34 to the base station 10 via the uplink dedicated control channel DCCH.

  With reference to FIG. 11, the operation of the base station 10 according to the present embodiment will be described.

  In Step 601, the receiving unit 11 of the base station 10 determines whether or not the “packet number change result (plus reservation)” has been received from the mobile station 30 by monitoring the uplink dedicated control channel DCCH. This operation proceeds to step 604 if YES, and proceeds to step 602 if NO.

  In step 602, the virtual buffer management unit 13 of the base station 10 determines whether or not there is a packet accumulated in the virtual buffer exceeding the allowable residence time for each traffic type. This operation proceeds to step 606 if YES, and proceeds to step 603 if NO.

  In step 603, the virtual buffer management unit 13 monitors the reception unit 11 to determine whether the reception of the packet transmitted from each mobile station 30 has been successful. This operation proceeds to step 606 if YES, and returns to step 601 if NO.

  In step 604, the virtual buffer management unit 13 stores the reception time (arrival time) of the “packet number change result (plus reservation)”, and in step 605, the “packet number change result (plus reservation)”. The packet corresponding to the increased number of packets in the “change result of the number of packets (plus reservation)” is added to the virtual buffer for the mobile station 30 that has transmitted

  In step 606, the virtual buffer management unit 13 deletes, from the virtual buffer, a packet corresponding to the number of packets accumulated in the virtual buffer exceeding the allowable residence time or the number of successfully received packets.

  The base station 30 is configured to repeat the processing of steps 601 to 606 at a predetermined cycle. Further, the base station 30 may be configured to perform the processing of steps 601 to 603 in parallel.

  With reference to FIG. 12, an example of the packet mobile communication method according to the present embodiment will be described.

  In step 3001, the determination unit 33 of the mobile station 30 detects that two packets to be transmitted to the base station 10 are generated, and the reservation unit 34 of the mobile station 30 determines that the number of packets in the transmission buffer 35 is two. A “plus reservation (+2)” including information that the number has been increased is created. Here, it is assumed that the determination unit 33 of the mobile station 30 also detects communication quality information (traffic type) of the generated packet.

  In step 3002, the transmission unit 36 of the mobile station 30 transmits the “plus reservation (+2)” and “traffic type” to the base station 10 via the uplink dedicated control channel DCCH. Here, the “traffic type” may be transmitted as a packet separate from the packet for transmitting “plus reservation (+2)” or in the header of the packet for transmitting “plus reservation (+2)”. It may be transmitted by being described.

  In step 3003, the reservation recognition unit 12 of the base station 10 notifies the virtual buffer management unit 13 of the received “plus reservation (+2)” and the arrival time of the “plus reservation (+2)”. Further, the traffic type recognition unit 17 of the base station 10 notifies the virtual buffer management unit 13 of “traffic type” transmitted from the mobile station 30 together with “plus reservation (+2)”.

  In step 3004, the virtual buffer management unit 13 adds two packets to the virtual buffer for the mobile station 30 in response to the notification from the reservation recognition unit 12 and the traffic type recognition unit 17. Here, the virtual buffer management unit 13 is configured to store the arrival time of the “plus reservation (+2)” and the “traffic type” in association with the added two packets.

  In step 3005, the scheduling unit 16 assigns radio resources to be used for uplink packet communication with the mobile station 30 based on the above-described “traffic type”, propagation path status with the mobile station 30, and the like. The resource allocation unit 14 refers to the virtual buffer for the mobile station 30 managed by the virtual buffer management unit 13 and refers to the radio resource (for example, radio channel number, code number, transmission timing, etc.) Assign. In the example of FIG. 12, the resource allocation unit 14 allocates radio resources for 3 packets.

  In step 3006, the transmission unit 15 of the base station 10 notifies the mobile station 30 of the radio resource allocated by the resource allocation unit 14 via the downlink dedicated control channel DCCH.

  In step 3007, the transmission unit 36 of the mobile station 30 transmits three packets to the base station 10 via the uplink common packet channel CPCH using the radio resource indicated by the reservation response recognition unit 32.

  In step 3008, the receiving unit 11 of the base station 10 successfully receives the above-described three packets.

  In step 3009, the receiving unit 11 of the base station 10 notifies “virtual buffer management unit 13 that the above-described three packets have been successfully received. Then, the virtual buffer management unit 13 notifies the receiving unit 11. Accordingly, 3 packets are reduced from the virtual buffer for the mobile station 30.

  In step 3010, the virtual buffer management unit 13 refers to the allowable residence time for each traffic type of each packet, and reduces two packets exceeding the allowable residence time from the virtual buffer.

(Fourth embodiment of the present invention)
A fourth embodiment of the present invention will be described with reference to FIG. Hereinafter, the difference between the present embodiment and the first embodiment will be mainly described.

  As shown in FIG. 13, the base station 10 according to the present embodiment includes a transmission buffer accumulated packet amount management unit 13a instead of the virtual buffer management unit 13 of the base station 10 according to the first embodiment described above. .

Transmission buffer stored packet quantity management unit 13a, without providing the virtual buffer as the virtual buffer managing unit 13 in the first embodiment described above, by a table or the like as shown in FIG. 13, each mobile station 30 ₁ to 30 Only the packet amount (for example, the number of packets) stored in the _n transmission buffers 35 is managed.

  Note that the transmission buffer accumulated packet amount management unit 13a, like the virtual buffer management unit 13 in the first embodiment described above, changes the amount of packets transmitted from the mobile station 30 ("plus reservation" or "minus reservation"). )), The packet amount is increased or decreased.

It is a functional block diagram of the base station which concerns on the 1st Embodiment of this invention. FIG. 3 is a functional block diagram of a mobile station according to the first embodiment of the present invention. 3 is a flowchart showing an operation of the mobile station according to the first embodiment of the present invention. It is a flowchart which shows operation | movement of the base station which concerns on the 1st Embodiment of this invention. It is a sequence diagram which shows the packet mobile communication method which concerns on the 1st Embodiment of this invention. It is a flowchart which shows operation | movement of the mobile station which concerns on the 2nd Embodiment of this invention. It is a flowchart which shows operation | movement of the base station which concerns on the 2nd Embodiment of this invention. It is a sequence diagram which shows the packet mobile communication method which concerns on the 2nd Embodiment of this invention. It is a functional block diagram of the base station which concerns on the 3rd Embodiment of this invention. 7 is a flowchart showing an operation of a mobile station according to the third embodiment of the present invention. It is a flowchart which shows operation | movement of the base station which concerns on the 3rd Embodiment of this invention. It is a sequence diagram which shows the packet mobile communication method which concerns on the 3rd Embodiment of this invention. It is a functional block diagram of the base station which concerns on the 4th Embodiment of this invention.

Explanation of symbols

10 ... base station 11, 31 ... receiving portion 12 ... reservation recognizing unit 13 ... virtual buffer management unit ₁₃ 1, 13 n _... virtual buffer 13a ... transmission buffer storing the packet amount management unit 14 ... resource allocation unit 15 and 36 ... transmitting portion 16 ... Scheduling unit 17 ... Traffic type recognition unit 18 ... Propagation path state recognition unit 30 ... Mobile station 32 ... Reservation response recognition unit 33 ... Decision unit 34 ... Reservation unit 35 ... Transmission buffer

Claims (14)

A packet mobile communication method for performing packet communication between a mobile station and a base station,
The base station manages a transmission buffer accumulation packet amount indicating a packet amount accumulated in the transmission buffer of the mobile station,
The mobile station notifies the base station of the change result of the packet amount every time a change occurs in the packet amount stored in the transmission buffer of the mobile station,
The base station increases / decreases the transmission buffer accumulated packet amount corresponding to the mobile station according to the notified change result of the packet amount. A base station that performs packet communication with a mobile station,
A management unit for managing a transmission buffer storage packet amount indicating a packet amount stored in the transmission buffer of the mobile station;
The management unit increases or decreases the transmission buffer accumulation packet amount corresponding to the mobile station according to a change result of the packet amount accumulated in the transmission buffer of the mobile station notified from the mobile station. Base station.   The management unit manages a virtual buffer that accumulates packets of the transmission buffer accumulation packet amount, and according to a change result of the packet amount accumulated in the transmission buffer of the mobile station notified from the mobile station The base station according to claim 2, wherein the number of packets in the virtual buffer corresponding to the mobile station is increased or decreased.   The base according to claim 3, further comprising: a resource allocation unit that allocates radio resources used for uplink packet communication with the mobile station with reference to the virtual buffer corresponding to the mobile station. Bureau.   The base station according to claim 4, wherein the management unit increases or decreases packets in the virtual buffer corresponding to the mobile station according to radio resource allocation by the resource allocation unit.   4. The base station according to claim 3, wherein, when receiving a packet transmitted from the mobile station, the management unit reduces the number of packets successfully received from the virtual buffer.   When the change result of the packet amount accumulated in the transmission buffer of the mobile station notified from the mobile station indicates the increase amount of the packet in the transmission buffer, the management unit corresponds to the increase amount The base station according to claim 3, wherein the base station adds the packet to the virtual buffer and manages the added packet and the addition time of the packet in association with each other.   The base station according to claim 7, wherein the management unit deletes a packet in the virtual buffer after a predetermined time has elapsed from the addition time. The management unit manages the added packet in association with the communication quality information of the packet notified from the mobile station,
8. The base according to claim 7, further comprising a scheduling unit that performs scheduling for allocation of radio resources used for uplink packet communication with the mobile station based on communication quality information of the packet. Bureau. A mobile station that performs packet communication with a base station,
A transmission buffer for storing packets to be transmitted to the base station;
A mobile station comprising: a notification unit that notifies the base station of a change result of the packet amount each time a change occurs in the packet amount stored in the transmission buffer.   The notification unit, when a packet to be transmitted to the base station occurs, notifies the base station of the number of packets generated as an increase amount of packets in the transmission buffer. 10. The mobile station according to 10.   11. The notification unit according to claim 10, wherein when the packet in the transmission buffer is discarded, the notification unit notifies the base station of the number of discarded packets as a decrease amount of the packet in the transmission buffer. Mobile stations.   The notification unit, when the packet transmission to the base station is successful, notifies the base station of the number of packets successfully transmitted as a decrease amount of the packet in the transmission buffer. The mobile station described in 1. The notification unit, when a packet to be retransmitted to the base station occurs, notifies the base station of the number of packets generated as an increase amount of packets in the transmission buffer. 10. The mobile station according to 10.

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