JP4506139B2 - Mobile communication system, radio base station, scheduling apparatus, and scheduling method used therefor - Google Patents

Description

  The present invention relates to a mobile communication system, a radio base station, a scheduling apparatus, a scheduling method used therefor, and a program thereof, and more particularly to a packet scheduling method for a radio base station in a mobile communication system that performs packet communication.

  In recent years, in this type of mobile communication system, the demand for data communication has increased along with an increase in data communication such as e-mail including Internet browsing and images (still images and moving images). The third generation mobile communication system, W-CDMA (Wideband Code Division Multiple Access), also uses 3GPP (3rd Generation Partnership Program), and HSDPA (High Speed Downlink accordion) that realizes high-speed downlink packet communication. Yes.

  In HSDPA, high-speed packet communication is realized in the downlink shared channel, but the radio base station allocates transmission opportunities to a plurality of mobile stations according to the downlink radio channel quality, thereby improving the throughput due to the user multiplexing effect. I am trying. The transmission opportunity allocation method is called scheduling, and the following are known as typical ones.

  Max. The C / I [Maximum CIR (Carrier Interference Ratio)] method (see, for example, Non-Patent Document 1) is a method of assigning a slot to a mobile station with the best radio channel quality for a mobile station waiting for packet transmission. Throughput characteristics can be greatly increased. However, there is a problem that the frequency of assigning transmission opportunities is low for mobile stations with poor radio channel quality such as cell boundaries.

  The PF (Proportional Fairness) method (see, for example, Non-Patent Document 2) is a scheduling method aimed at making transmission opportunities fair for mobile stations waiting for packet transmission. In this PF system, for example, “instantaneous radio channel quality / average radio channel quality” of a mobile station is obtained as a metric, and a transmission opportunity is assigned to a mobile station having a large metric.

  Therefore, in this PF scheme, since the relative quality with respect to the average radio channel quality is used as a metric, a transmission opportunity can be assigned to a mobile station having a low average radio channel quality.

3GPP TR25.848 4.0.0 (2001-03), “Physical layer aspects of High Speed Downlink Packet Access” A. Jalali et. al, “Data Throughput of CDMA-HDR a High Efficiency-High Data Rate Personal Communication Wireless System”, IEEE 51st Vehicular Technology (IEEE).

  However, in the conventional scheduling method, the radio channel quality of the mobile station is considered when assigning transmission opportunities in order to improve the throughput, but quality assurance for each service is not considered.

  In consideration of future communication services, there is a possibility that quality of service (QoS) may not be satisfied when quality assurance for each service is required.

  Accordingly, an object of the present invention is to solve the above-mentioned problems and to make the mobile station service quality close to the service quality required by the user, a mobile communication system, a radio base station, a scheduling device, a scheduling method used therefor, and its To provide a program.

A mobile communication system according to the present invention includes a plurality of mobile stations that report radio channel quality information using an uplink dedicated channel, a packet that communicates with the plurality of mobile stations and that transmits packets to the plurality of mobile stations using a downlink shared channel. A mobile communication system including a radio base station for transmitting
The radio base station is configured to calculate a required service quality from a requested service quality set in the plurality of mobile stations and a transmission status indicating a data amount that has not been transmitted until the present time, and the calculated required requirements A plurality of granting means for giving a transmission opportunity to the mobile station according to the service quality and the radio channel quality information, and at least one of the plurality of granting means uses the past instantaneous radio channel quality.

Another mobile communication system according to the present invention includes a plurality of mobile stations that report radio channel quality information using an uplink dedicated channel, and a plurality of mobile stations that communicate with the plurality of mobile stations and use a downlink shared channel. A mobile communication system including a radio base station that transmits a packet to
Means for calculating the required service quality from the requested service quality set in the plurality of mobile stations and the transmission status indicating the amount of data that has not been transmitted up to the present time; and the calculated required service quality is a predetermined service. First granting means for giving a transmission opportunity to a mobile station exceeding a quality threshold, and movement where the required service quality is equal to or less than the service quality threshold when there is no mobile station whose required service quality exceeds the service quality threshold Second granting means for giving a transmission opportunity to the station, and the first granting means uses the past instantaneous radio channel quality.

A radio base station according to the present invention is a radio base station that communicates with a plurality of mobile stations notifying radio channel quality information using an uplink dedicated channel and transmits packets to the plurality of mobile stations using a downlink shared channel. There,
Means for calculating the required service quality from the requested service quality set in the plurality of mobile stations and the transmission status indicating the amount of data that has not been transmitted so far, and the calculated required service quality and the radio link A plurality of means for giving a transmission opportunity to the mobile station according to the quality information, and at least one of the plurality of means uses the past instantaneous radio channel quality.

Another radio base station according to the present invention communicates with a plurality of mobile stations notifying radio channel quality information using an uplink dedicated channel and transmits packets to the plurality of mobile stations using a downlink shared channel. Station,
First means for calculating a required service quality from a requested service quality set in the plurality of mobile stations and a transmission status indicating a data amount that has not been transmitted until the present time, and the calculated required service quality Second means for giving a transmission opportunity to a mobile station exceeding a predetermined service quality threshold; and when there is no mobile station whose required service quality exceeds the service quality threshold, the required service quality is equal to or less than the service quality threshold. A third means for giving a transmission opportunity to the mobile station, and the second means uses the past instantaneous wireless channel quality.

The scheduling apparatus according to the present invention communicates with a plurality of mobile stations that report radio channel quality information using an uplink dedicated channel, and transmits packets to the plurality of mobile stations using a downlink shared channel. A scheduling apparatus for performing scheduling of the packet in a mobile communication system including a radio base station for transmission,
Means for calculating the required service quality from the requested service quality set in the plurality of mobile stations and the transmission status indicating the amount of data that has not been transmitted so far, and the calculated required service quality and the radio link A plurality of means for giving a transmission opportunity to the mobile station according to the quality information, and at least one of the plurality of means uses the past instantaneous radio channel quality.

Another scheduling apparatus according to the present invention communicates with a plurality of mobile stations that report radio channel quality information using an uplink dedicated channel, and communicates with the plurality of mobile stations and uses the downlink shared channel to the plurality of mobile stations. A scheduling apparatus that performs scheduling of the packet in a mobile communication system including a radio base station that transmits the packet,
First means for calculating a required service quality from a requested service quality set in the plurality of mobile stations and a transmission status indicating a data amount that has not been transmitted until the present time, and the calculated required service quality Second means for giving a transmission opportunity to a mobile station whose service quality exceeds a predetermined service quality threshold, and when there is no mobile station whose required service quality exceeds the service quality threshold, the required service quality is the service quality threshold And a third means for giving a transmission opportunity to the following mobile station, wherein the second means uses the past instantaneous radio channel quality.

According to the scheduling method of the present invention, a plurality of mobile stations that report radio channel quality information using an uplink dedicated channel, communicate with the plurality of mobile stations, and send packets to the plurality of mobile stations using a downlink shared channel. A scheduling method for performing scheduling of the packet in a mobile communication system including a transmitting radio base station,
On the radio base station side, calculating the required service quality from the requested service quality set in the plurality of mobile stations and the transmission status indicating the amount of data that has not been transmitted up to the present time, and the calculated A plurality of steps for giving a transmission opportunity to the mobile station according to the required service quality and the wireless channel quality information, and the past instantaneous wireless channel quality is used in at least one of the plurality of steps.

According to another scheduling method of the present invention, a plurality of mobile stations notifying radio channel quality information using an uplink dedicated channel, communicating with the plurality of mobile stations, and using the downlink shared channel to the plurality of mobile stations. A scheduling method for scheduling the packet in a mobile communication system including a radio base station that transmits the packet,
A first step of calculating a required service quality on the radio base station side based on a requested service quality set in the plurality of mobile stations and a transmission status indicating a data amount that has not been transmitted until the present time; A second step of giving a transmission opportunity to a mobile station for which the required service quality exceeds a predetermined service quality threshold, and the required service when there is no mobile station whose required service quality exceeds the service quality threshold And a third step of giving a transmission opportunity to a mobile station whose quality is equal to or lower than the service quality threshold, and the past instantaneous wireless channel quality is used in the second step.

The program according to the present invention communicates with a plurality of mobile stations notifying radio channel quality information using an uplink dedicated channel, and transmits packets to the plurality of mobile stations using a downlink shared channel. A program executed by a computer of the radio base station in a mobile communication system including the radio base station,
A process for calculating the required service quality from the required service quality set in the plurality of mobile stations and a transmission status indicating the amount of data that has not been transmitted up to the present time, and the calculated required service quality and the radio channel A plurality of processes for giving a transmission opportunity to the mobile station according to the quality information are executed, and past instantaneous wireless channel quality is used in at least one of the plurality of processes.

Another program according to the present invention includes a plurality of mobile stations notifying radio channel quality information using an uplink dedicated channel, communicating with the plurality of mobile stations, and transmitting packets to the plurality of mobile stations using a downlink shared channel. A program executed by a computer of the radio base station in a mobile communication system including a radio base station that transmits
A first process for calculating the required service quality from the required service quality set in the plurality of mobile stations and a transmission status indicating a data amount that has not been transmitted up to the present time; and the calculated required service quality A second process for giving a transmission opportunity to a mobile station having a service quality threshold exceeding a predetermined service quality threshold; and when there is no mobile station whose required service quality exceeds the service quality threshold, the required service quality is the service quality threshold The following third process for giving a transmission opportunity to the mobile station is executed, and the past instantaneous wireless channel quality is used in the second process.

  That is, in the mobile communication system of the present invention, the urgency to achieve preset service quality is measured based on the required service quality and the achievement level of service quality, and the priority of transmission opportunities is given to mobile stations with high urgency. Can be increased.

  In the mobile communication system of the present invention, since a transmission opportunity is assigned to a mobile station having a high degree of urgency to achieve preset service quality according to a metric obtained from the radio channel quality, transmission opportunity assignment It is possible to make the probability of being almost the same between mobile stations.

  Further, in the mobile communication system of the present invention, when a transmission opportunity is allocated to a mobile station by distinguishing the achievement level of service quality by two thresholds, a transmission opportunity is preferentially allocated from a mobile station that does not satisfy the small threshold. It becomes possible to improve the achievement level of service quality from a mobile station with a remarkably low achievement level.

  In the mobile communication system of the present invention, if a transmission opportunity is given to a mobile station that does not satisfy the next largest threshold value, it becomes possible to reduce the number of mobile stations that are remarkably low in achievement. Therefore, even if a mobile station that assigns transmission opportunities decreases and a mobile station with a low achievement level occurs, it is possible to concentrate transmission opportunities on the mobile station in a concentrated manner. Can be reduced.

  The present invention has an effect that the service quality of the mobile station can be brought close to the required service quality by adopting the configuration and operation described below.

  Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a mobile communication system according to an embodiment of the present invention. In FIG. 1, a mobile communication system according to an embodiment of the present invention includes a radio network controller 1, radio base stations 2-1 and 2-2, and mobile stations 3-1 to 3-4.

  The radio network controller 1 is connected to a plurality of radio base stations 2-1 and 2-2, and each of the radio base stations 2-1 and 2-2 has a radio link with a plurality of mobile stations 3-1 to 3-4. Connected by.

  FIG. 2 is a block diagram showing the configuration of the radio base stations 2-1 and 2-2 in FIG. In FIG. 2, for the radio base stations 2-1 and 2-2 (hereinafter, the radio base stations 2-1 and 2-2 are collectively referred to as a radio base station 2), as shown in FIG. The example of a structure in case the two mobile stations 3-1 to 3-4 are connected is shown.

  The radio base station 2 includes a data flow control unit 10, uplink signal analysis units 11-1 and 11-2, a HARQ (Hybrid Automatic Repeat reQuest) control unit 12, a scheduler 13, a data transmission unit 14, and a recording medium 15. It consists of and.

  Uplink signal analysis units 11-1 and 11-2 are prepared for each of mobile stations 3-1 to 3-4, and reception state notification units 11a-1 and 11a-2 (reception state notification unit 11a-2 is not shown). And line quality notification units 11b-1 and 11b-2 (the line quality notification unit 11b-2 is not shown).

  The scheduler 13 includes a required service quality calculation unit 131, a required service quality calculation unit 132, a quality comparison unit 133, a PF (Proportional Fairness) scheduler 134, a Max. It is composed of a C / I [Maximum CIR (Carrier Interference Ratio)] scheduler 135 and a selector 136.

  The data flow control unit 10 is connected to the radio network controller 1, the HARQ control unit 12, the scheduler 13, and the data transmission unit 14, respectively. In the upstream signal analysis units 11-1 and 11-2, the reception state notification units 11a-1 and 11a-2 are connected to the HARQ control unit 12, and the line quality notification units 11b-1 and 11b-2 are included in the scheduler 13. PF scheduler 134 and Max. It is connected to the C / I scheduler 135. The mobile station determination process by the PF scheduler 134 is described in Non-Patent Document 2 described above in Max. The mobile station determination processing by the C / I scheduler 135 is described in Non-Patent Document 1 above.

  The recording medium 15 is connected to the scheduler 13, but not only a program executed by the scheduler 13 (a computer executable program), but also a data flow control unit 10, upstream signal analysis units 11-1 and 11-2, HARQ Programs executed by the control unit 12 and the data transmission unit 14 are also stored.

  The radio base station 2 that has received the uplink signal analyzes the uplink signal by the uplink signal analysis units 11-1 and 11-2 prepared for each of the mobile stations 3-1 to 3-4. Since the uplink signal includes the reception state and the channel quality, the HARQ control unit 12 and the PF scheduler 134 or Max from the reception state notification units 11a-1, 11a-2 and the line quality notification units 11b-1, 11b-2. . Each analysis result is notified to the C / I scheduler 135.

  The HARQ control unit 12 determines whether or not retransmission is necessary based on the analysis results of the reception state notification units 11a-1 and 11a-2, and notifies the data flow control unit 10 of the determination result. When the data flow control unit 10 receives data from the radio network controller 1, the data flow control unit 10 stores the data in a non-transmission buffer (not shown) and sends the data to the data transmission unit 14 according to an instruction from the selection unit 136.

  When transmitting data in the untransmitted buffer, the data flow control unit 10 moves the data from the untransmitted buffer to a transmitted buffer (not shown). When transmitting data in the transmitted buffer (in the case of retransmission), the data flow control unit 10 sends the data from the transmitted buffer and then stores the data as it is.

  The data transmission unit 14 performs error correction coding on the data from the data flow control unit 10, modulates the data, and transmits the data to the corresponding mobile stations 3-1 to 3-4.

  In addition, when the data flow control unit 10 receives a notification from the HARQ control unit 12 that retransmission is not necessary, the data flow control unit 10 discards the data stored in the transmitted buffer. When the data flow control unit 10 receives notification from the HARQ control unit 12 that retransmission is necessary, the data flow control unit 10 stores the data in the transmitted buffer as it is.

  3 and 4 are flowcharts showing the operation of the scheduler 13 of FIG. The operation of the scheduler 13 will be described with reference to FIGS. The processing shown in FIGS. 3 and 4 is realized by the scheduler 13 executing the program of the recording medium 15.

  When the scheduler 13 is notified of a mobile station having data to be transmitted at a constant cycle (packet transmission cycle) from the data flow control unit 10 (step S1 in FIG. 3), the movement notified by the required service quality calculation unit 131 is transmitted. Calculate the quality of service required to transmit the remaining data to the station. Further, when the requested service quality for each mobile station is notified from the data flow control unit 10, the requested service quality calculation unit 132 sets the requested service quality as a service quality threshold (step S 2 in FIG. 3).

  The quality comparison unit 133 compares the required service quality calculated by the required service quality calculation unit 131 with the required service quality (service quality threshold) set by the required service quality calculation unit 132, and the required service quality threshold is the required service. If the quality is higher than the quality (service quality threshold) (step S3 in FIG. 3), the mobile station is assigned to the PF scheduler 134, and if the required service quality threshold is lower than the required service quality (service quality threshold) (step S8 in FIG. 4), Max. The mobile station is allocated to the C / I scheduler 135.

Here, a specific calculation method of the required service quality calculation unit 131 will be described. Since the quality of service can be considered in terms of the transmission rate, the required transmission rate Rrequest calculated from the expected transmission time Tpredict until the completion of data transmission, the elapsed time Tpast from the arrival of data to the present, and the data amount L currently not transmitted is Use. That is, the required transmission rate is
Rrequest = L / (Tpredict-Tpast)
It can be calculated by the formula

  However, when Rrequest <0, the maximum transmission rate Rmax determined by the capability of the mobile station is used. Rrequest = Rmax is also set when Rrequest> Rmax.

  The quality comparison unit 133 compares the Rrequest obtained by the above equation with the required service quality (transmission rate) Rtarget. The mobile station with Rrequest> Rtarget is selected by the PF scheduler 134, and conversely, the mobile station with Rrequest <Rtarget is Max. Selected by the C / I scheduler 135.

  The distribution to the PF scheduler 134 indicates that there is a high possibility that the service quality will not be satisfied unless it is transmitted at a high transmission rate higher than the required service quality at the present time. It is necessary to assign a transmission opportunity to.

  Thereafter, when there is a mobile station assigned to the PF scheduler 134, the selection unit 136 gives a transmission opportunity to the mobile station having the maximum metric obtained from the radio channel quality (step S4 in FIG. 3). After this, the scheduler 13 has more radio resources (step S5 in FIG. 3), and if there is a mobile station that can transmit (a mobile station having data to be transmitted) (step S6 in FIG. 3), the scheduler 13 further selects a mobile station. Repeat the process.

  If there is no mobile station that can transmit to the PF scheduler 132 and there is a sufficient radio resource, the selection unit 136 sets Max. A transmission opportunity is given to the mobile stations allocated to the C / I scheduler 135. The selection unit 136 includes a plurality of mobile stations connected to Max. If it exists in the C / I scheduler 135 (step S8 in FIG. 4), a transmission opportunity is given to the mobile station with the highest radio channel quality (step S9 in FIG. 4).

  This process is repeated until there is no radio resource (step S10 in FIG. 4) or there are no mobile stations that give a transmission opportunity (step S11 in FIG. 4). Finally, the selection unit 136 notifies the data flow control unit 10 of the selected mobile station, and the data flow control unit 10 sends the data to the data transmission unit 14 (step S7 in FIG. 3).

  According to the operation described above, in this embodiment, transmission opportunities can be preferentially allocated to mobile stations whose required service quality exceeds the required service quality. That is, in this embodiment, transmission opportunities can be preferentially allocated to mobile stations that cannot achieve the required service quality by the conventional transmission opportunity allocation method.

  As described above, in this embodiment, since a transmission opportunity is given preferentially to a mobile station that does not satisfy the required service quality, the service quality of the mobile station can be brought close to the required service quality.

  FIG. 5 is a block diagram showing a configuration of a radio base station according to another embodiment of the present invention. In FIG. 5, a radio base station according to another embodiment of the present invention has a scheduler 13 except that a service quality calculation unit 137 is provided instead of the required service quality calculation unit 131, and two PF schedulers 134a and 134b are provided. The configuration is the same as that of the radio base station 2 according to the embodiment of the present invention shown in FIG. 2, and the same components are denoted by the same reference numerals. Although not shown, the configuration of a mobile communication system according to another embodiment of the present invention is the same as that of the mobile communication system according to one embodiment of the present invention shown in FIG.

  The data flow control unit 10 is connected to the radio network controller 1, the HARQ control unit 12, the scheduler 13, and the data transmission unit 14, respectively. The reception state notification unit 11a is connected to the HARQ control unit 12. In the upstream signal analysis units 11-and 11-2, the reception state notification units 11 a-1 and 11 a-2 are connected to the PF schedulers 134 a and 134 b and the Max. Each is connected to the C / I scheduler 135.

  The radio base station 2 that has received the uplink signal analyzes the uplink signal by the uplink signal analysis units 11-1 and 11-2 prepared for each of the mobile stations 3-1 to 3-4. Since the uplink signal includes the reception state and the line quality, the reception state notification units 11a-1 and 11a-2 and the line quality notification units 11b-1 and 11b-2 respectively transfer the HARQ control unit 12 and the scheduler 13 with each other. The analysis result is notified.

  The HARQ control unit 12 determines whether or not retransmission is necessary based on the analysis results of the reception state notification units 11a-1 and 11a-2, and notifies the data flow control unit 10 of the determination result.

  The data flow control unit 10 receives data from the radio network controller 1 and stores it in a non-transmission buffer (not shown), and sends the data to the data transmission unit 14 according to an instruction from the selection unit 136.

  When transmitting data in the untransmitted buffer, the data flow control unit 10 moves the data from the untransmitted buffer to a transmitted buffer (not shown). When transmitting data in the transmitted buffer (in the case of retransmission), the data flow control unit 10 sends the data from the transmitted buffer and then stores the data as it is. The data transmission unit 14 performs error correction coding and modulation, and transmits the data to the mobile stations 3-1 to 3-4.

  In addition, when the data flow control unit 10 receives a notification from the HARQ control unit 12 that retransmission is not necessary, the data flow control unit 10 discards the data stored in the transmitted buffer. When the data flow control unit 10 receives notification from the HARQ control unit 12 that retransmission is necessary, the data flow control unit 10 stores the data in the transmitted buffer as it is.

  6 and 7 are flowcharts showing the operation of the scheduler 13 of FIG. The operation of the scheduler 13 will be described with reference to FIGS. 6 and 7 is realized by the scheduler 13 executing the program of the recording medium 15.

  When the scheduler 13 is notified of a mobile station having data to be transmitted at a constant cycle (packet transmission cycle) from the data flow control unit 10 (step S21 in FIG. 6), the scheduler 13 provides service quality to the notified mobile station. The quality calculation unit 137 calculates. Further, when the requested service quality for each mobile station is notified from the data flow control unit 10, the requested service quality calculation unit 132 sets the requested service quality as the service quality threshold (step S 22 in FIG. 6).

  The achievement level determination unit 138 compares the service quality calculated by the service quality calculation unit 137 with the required service quality set by the required service quality calculation unit 132 (service quality threshold 9), and the achievement level of the service quality is set in advance. If it is less than the threshold A1 (step S23 in FIG. 6), it is reported to the PF scheduler 134a, and if it is greater than or equal to the threshold A1 and less than the preset threshold A2 (step S28 in FIG. 7), it is reported to the PF scheduler 134b. If it is above (step S28 in FIG. 7), it is reported to the Max.C / I scheduler 135.

Here, a method of calculating the achievement level of service quality will be described in detail. For example, the achievement level of service quality can be defined by the ratio of the measured average transmission rate Rmeasure and the required transmission rate Rtarget. The average transmission rate Rmeasure is a transmission rate calculated by the radio base station from the amount of data transmitted in the past, and the required transmission rate Rtarget is a transmission rate determined in advance for each mobile station. Therefore, the achievement level A is
A = Rmeasure / Rtarget
It can be calculated from the formula

  Moreover, the threshold value should just make 1st threshold value A1 smaller than 2nd threshold value A2, for example, can set it as threshold value A1 = 1.0 and threshold value A2 = 1.5. At this time, a mobile station that does not achieve service quality is selected for the PF scheduler 134a, and a mobile station that achieves a transmission rate up to 1.5 times is selected for the PF scheduler 134b. Max. A mobile station that achieves a transmission rate of 1.5 times or more is selected for the C / I scheduler 135.

Further, as described in the embodiment of the present invention, the achievement level A is calculated by using the required transmission rate Rrequest representing the required service quality necessary for transmitting the remaining data instead of the average transmission rate. ,
A = Rtarget / Rrequest
You may define with the formula.

  Since the required transmission rate Rrequest is a transmission rate required in the future, the achievement level A must be defined by dividing the required transmission rate Rtarget by the required transmission rate Rrequest.

  After this, the scheduler 13 gives transmission opportunities in order from the mobile station having the lowest achievement level. In this selection procedure, first, if a mobile station is selected in the PF scheduler 134a, a mobile station to be given a transmission opportunity is determined from the mobile stations (step S24 in FIG. 6). After this, the scheduler 13 has sufficient radio resources (step S25 in FIG. 6), and if there is a mobile station that can transmit (a mobile station having data to be transmitted) (step S26 in FIG. 6), the scheduler 13 further selects a mobile station. Repeat the process.

  If there is no mobile station that can be transmitted to the PF scheduler 134a and there is a surplus of radio resources (step S25 in FIG. 6), the scheduler 13 has a mobile station whose achievement level is greater than or equal to the threshold A1 and less than the threshold A2 (FIG. 7). In step S28, a mobile station to which a transmission opportunity is given from the PF scheduler 134b is determined (step S29 in FIG. 7). If a plurality of mobile stations are selected, the scheduler 13 transmits, as described above, until there is no radio resource (step S30 in FIG. 7) or there are no mobile stations (step S31 in FIG. 7), as in the case of the PF scheduler 134a. Select the mobile station that gives you the opportunity.

  Next, if there is no mobile station whose achievement level is greater than or equal to the threshold A1 and less than the threshold A2 (step S28 in FIG. 7) and there are sufficient radio resources, the scheduler 13 sets Max. A transmission opportunity is given to the mobile station by the C / I scheduler 135 (step S32 in FIG. 7). Similarly to the PF scheduler 134a and the PF scheduler 134b, the scheduler 13 allocates radio resources until there is no radio resource or the number of mobile stations that can be transmitted becomes zero. Finally, the scheduler 13 notifies the selected mobile station to the data flow control unit 10, and the data flow control unit 10 sends the data to the data transmission unit 14 (step S27 in FIG. 6).

  According to the above-described operation, in the present embodiment, transmission opportunities are preferentially assigned from mobile stations whose achievement level is equal to or less than the threshold A1, and therefore, when there is no mobile station equal to or less than the threshold A1, a mobile station that is equal to or greater than the threshold A1 and less than the threshold A2 A transmission opportunity is preferentially assigned to.

  As described above, in this embodiment, since a transmission opportunity is given preferentially to a mobile station that does not satisfy the required service quality, the service quality of the mobile station can be brought close to the required service quality.

It is a block diagram which shows the structure of the mobile communication system by one Example of this invention. FIG. 2 is a block diagram showing a configuration of a radio base station in FIG. 1. It is a flowchart which shows operation | movement of the scheduler of FIG. It is a flowchart which shows operation | movement of the scheduler of FIG. It is a block diagram which shows the structure of the wireless base station by the other Example of this invention. It is a flowchart which shows operation | movement of the scheduler of FIG. It is a flowchart which shows operation | movement of the scheduler of FIG.

Explanation of symbols

1 Radio link control station 2, 2-1, 2-2 Radio base station 3-1 to 3-4 Mobile station
10 Data Flow Control Units 11-1, 11-2 Uplink Signal Analysis Unit
11a-1 Reception state notification unit
11b-1 Line quality notification unit
12 HARQ control unit
13 Scheduler
14 Data transmitter
15 Recording media
131 Required Service Quality Calculation Department
132 Required service quality calculator
133 Quality comparison unit 134, 134a,
134b PF scheduler
135 Max. C / I scheduler
136 Selector
137 Service Quality Calculator
138 Achievement determination unit

Claims (30)

A plurality of mobile stations notifying radio channel quality information using an uplink dedicated channel, and a radio base station communicating with the plurality of mobile stations and transmitting packets to the plurality of mobile stations using a downlink shared channel A mobile communication system comprising:
The radio base station is configured to calculate a required service quality from a requested service quality set in the plurality of mobile stations and a transmission status indicating a data amount that has not been transmitted until the present time, and the calculated required requirements A plurality of means for giving a transmission opportunity to a mobile station according to service quality and the wireless channel quality information, wherein at least one of the plurality of means uses past instantaneous wireless channel quality, Mobile communication system. A plurality of mobile stations notifying radio channel quality information using an uplink dedicated channel, and a radio base station communicating with the plurality of mobile stations and transmitting packets to the plurality of mobile stations using a downlink shared channel A mobile communication system comprising:
First means for calculating a required service quality from a requested service quality set in the plurality of mobile stations and a transmission status indicating a data amount that has not been transmitted until the present time, and the calculated required service quality Second means for giving a transmission opportunity to a mobile station exceeding a predetermined service quality threshold; and when there is no mobile station whose required service quality exceeds the service quality threshold, the required service quality is equal to or less than the service quality threshold. And a third means for giving a transmission opportunity to the mobile station, wherein the second means uses past instantaneous radio channel quality.   When a reference transmission rate is determined as the required service quality, an allowable transmission time is calculated by dividing the amount of data to be transmitted by the reference transmission rate, and an elapsed time from the arrival of data to be transmitted to the present time is calculated. 3. The mobile communication system according to claim 2, wherein the remaining transmission time is calculated by subtracting from the allowable transmission time, and the required service quality is calculated by dividing the amount of data that has not been transmitted by the remaining transmission time. .   When there are a plurality of mobile stations whose service quality exceeds the service quality threshold and there are a plurality of mobile stations whose service quality exceeds the service quality threshold, a transmission opportunity is assigned to the mobile station having the maximum metric required from the radio channel quality. The mobile communication system according to claim 2 or claim 3, wherein The mobile communication system according to claim 4, wherein when only the mobile station having the required service quality equal to or less than a service quality threshold exists, a transmission opportunity is assigned to the mobile station having the best radio channel quality.   6. The movement according to claim 3, wherein the metric is obtained by calculating a ratio between an instantaneous radio channel quality and an average radio channel quality obtained from a plurality of past instantaneous radio channel qualities. Communications system.   The metric is obtained by normalizing and calculating a difference between the instantaneous radio channel quality and an average radio channel quality obtained from the instantaneous radio channel quality obtained in the past a plurality of times by the average radio channel quality. The mobile communication system according to any one of claims 3 to 5. A radio base station that communicates with a plurality of mobile stations that notify radio channel quality information using an uplink dedicated channel and transmits packets to the plurality of mobile stations using a downlink shared channel,
Means for calculating the required service quality from the requested service quality set in the plurality of mobile stations and the transmission status indicating the amount of data that has not been transmitted so far, and the calculated required service quality and the radio link And a plurality of means for giving a transmission opportunity to the mobile station in accordance with the quality information, wherein at least one of the plurality of means uses the past instantaneous radio channel quality. A radio base station that communicates with a plurality of mobile stations that report radio channel quality information using an uplink dedicated channel and transmits packets to the plurality of mobile stations using a downlink shared channel,
First means for calculating a required service quality from a requested service quality set in the plurality of mobile stations and a transmission status indicating a data amount that has not been transmitted until the present time, and the calculated required service quality Second means for giving a transmission opportunity to a mobile station exceeding a predetermined service quality threshold; and when there is no mobile station whose required service quality exceeds the service quality threshold, the required service quality is equal to or less than the service quality threshold. And a third means for giving a transmission opportunity to the mobile station, wherein the second means uses a past instantaneous radio channel quality. The means for calculating the required service quality calculates an allowable transmission time by dividing the amount of data to be transmitted by the reference transmission rate when a reference transmission rate is determined as the required service quality, and the transmission should be performed. The remaining transmission time is calculated by subtracting the elapsed time from the time of data arrival to the present time from the allowable transmission time, and the required service quality is calculated by dividing the amount of data that has not been transmitted by the remaining transmission time. The radio base station according to claim 9. When there are a plurality of mobile stations whose service quality exceeds the service quality threshold, and there are a plurality of mobile stations whose service quality exceeds the service quality threshold, a transmission opportunity is assigned to the mobile station having the maximum metric required from the radio channel quality. The radio base station according to claim 9 or 10, wherein the radio base station is characterized. 12. The radio base station according to claim 11, wherein when only the mobile station having the required service quality equal to or lower than the service quality threshold exists, a transmission opportunity is assigned to the mobile station having the best radio channel quality. 13. The radio base station according to claim 11, wherein the metric is obtained by calculating a ratio between an instantaneous radio channel quality and an average radio channel quality obtained from a plurality of past instantaneous radio channel qualities. The metric is obtained by normalizing and calculating a difference between the instantaneous radio channel quality and an average radio channel quality obtained from the instantaneous radio channel quality obtained in the past a plurality of times by the average radio channel quality. Item 13. The radio base station according to item 11 or claim 12. A plurality of mobile stations notifying radio channel quality information using an uplink dedicated channel, and a radio base station communicating with the plurality of mobile stations and transmitting packets to the plurality of mobile stations using a downlink shared channel A scheduling apparatus for scheduling the packet in a mobile communication system including:
Means for calculating the required service quality from the requested service quality set in the plurality of mobile stations and the transmission status indicating the amount of data that has not been transmitted so far, and the calculated required service quality and the radio link And a plurality of means for giving a transmission opportunity to the mobile station in accordance with the quality information, wherein at least one of the plurality of means uses past instantaneous radio channel quality. A plurality of mobile stations notifying radio channel quality information using an uplink dedicated channel, and a radio base station communicating with the plurality of mobile stations and transmitting packets to the plurality of mobile stations using a downlink shared channel A scheduling apparatus for scheduling the packet in a mobile communication system including:
First means for calculating a required service quality from a requested service quality set in the plurality of mobile stations and a transmission status indicating a data amount that has not been transmitted until the present time, and the calculated required service quality Second means for giving a transmission opportunity to a mobile station whose service quality exceeds a predetermined service quality threshold, and when there is no mobile station whose required service quality exceeds the service quality threshold, the required service quality is the service quality threshold And a third means for giving a transmission opportunity to the following mobile station, wherein the second means uses past instantaneous radio channel quality. The means for calculating the required service quality calculates an allowable transmission time by dividing an amount of data to be transmitted by the reference transmission rate when a reference transmission rate is determined as the required service quality, and data to be transmitted The remaining transmission time is calculated by subtracting the elapsed time from the arrival time to the present time from the allowable transmission time, and the required service quality is calculated by dividing the amount of data that has not been transmitted by the remaining transmission time. The scheduling apparatus according to claim 16. A transmission opportunity is allocated to a mobile station whose required service quality does not exceed the service quality threshold when the metric required from the radio channel quality is maximum when there are a plurality of mobile stations exceeding the service quality threshold. 18. The scheduling apparatus according to claim 16 or 17, wherein: 19. The scheduling apparatus according to claim 18, wherein a transmission opportunity is assigned to a mobile station having the best radio channel quality when only the mobile station having a required service quality equal to or lower than a service quality threshold exists. 20. The scheduling apparatus according to claim 18, wherein the metric is obtained by calculating a ratio between an instantaneous radio channel quality and an average radio channel quality obtained from a plurality of past instantaneous radio channel qualities. The metric is obtained by normalizing and calculating a difference between the instantaneous radio channel quality and an average radio channel quality obtained from the instantaneous radio channel quality obtained in the past a plurality of times by the average radio channel quality. Item 20. The scheduling device according to Item 18 or Item 19. A plurality of mobile stations notifying radio channel quality information using an uplink dedicated channel, and a radio base station communicating with the plurality of mobile stations and transmitting packets to the plurality of mobile stations using a downlink shared channel A scheduling method for scheduling the packet in a mobile communication system including:
On the radio base station side, calculating the required service quality from the requested service quality set in the plurality of mobile stations and the transmission status indicating the amount of data that has not been transmitted up to the present time, and the calculated A plurality of steps for giving a transmission opportunity to a mobile station in accordance with required service quality and the radio channel quality information, and using past instantaneous radio channel quality in at least one of the plurality of steps. Scheduling method. A plurality of mobile stations notifying radio channel quality information using an uplink dedicated channel, and a radio base station communicating with the plurality of mobile stations and transmitting packets to the plurality of mobile stations using a downlink shared channel A scheduling method for scheduling the packet in a mobile communication system including:
A first step of calculating a required service quality on the radio base station side based on a requested service quality set in the plurality of mobile stations and a transmission status indicating a data amount that has not been transmitted until the present time; A second step of giving a transmission opportunity to a mobile station for which the required service quality exceeds a predetermined service quality threshold, and the required service when there is no mobile station whose required service quality exceeds the service quality threshold And a third step of giving a transmission opportunity to a mobile station whose quality is equal to or less than the service quality threshold value, and using the past instantaneous radio channel quality in the second step. The step of calculating the required service quality calculates an allowable transmission time by dividing the amount of data to be transmitted by the reference transmission rate when a reference transmission rate is determined as the required service quality, and the transmission should be performed The remaining transmission time is calculated by subtracting the elapsed time from the time of data arrival to the present time from the allowable transmission time, and the required service quality is calculated by dividing the amount of data that has not been transmitted by the remaining transmission time. The scheduling method according to claim 23. Assigning a transmission opportunity to a mobile station having a maximum metric required from the radio channel quality when there are a plurality of mobile stations exceeding the service quality threshold for the mobile station having the required service quality exceeding the service quality threshold. 25. The scheduling method according to claim 23 or 24, wherein: 26. The scheduling method according to claim 25, wherein a transmission opportunity is assigned to a mobile station having the best radio channel quality when only the mobile station having a required service quality equal to or lower than a service quality threshold exists. 27. The scheduling method according to claim 25 or 26, wherein the metric is obtained by calculating a ratio between an instantaneous radio channel quality and an average radio channel quality obtained from a plurality of past instantaneous radio channel qualities. The metric is obtained by normalizing and calculating a difference between the instantaneous radio channel quality and an average radio channel quality obtained from the instantaneous radio channel quality obtained in the past a plurality of times by the average radio channel quality. 27. A scheduling method according to claim 25 or claim 26. A plurality of mobile stations notifying radio channel quality information using an uplink dedicated channel, and a radio base station communicating with the plurality of mobile stations and transmitting packets to the plurality of mobile stations using a downlink shared channel A program executed by a computer of the radio base station in a mobile communication system including:
Processing for calculating required service quality from the requested service quality set in the plurality of mobile stations and a transmission status indicating the amount of data that has not been transmitted until the present time, the calculated required service quality and the radio A program for executing a plurality of processes for giving a transmission opportunity to a mobile station in accordance with channel quality information, and using past instantaneous radio channel quality in at least one of the plurality of processes. A plurality of mobile stations notifying radio channel quality information using an uplink dedicated channel, and a radio base station communicating with the plurality of mobile stations and transmitting packets to the plurality of mobile stations using a downlink shared channel A program executed by a computer of the radio base station in a mobile communication system including:
A first process for calculating the required service quality from the required service quality set in the plurality of mobile stations and a transmission status indicating a data amount that has not been transmitted up to the present time; and the calculated required service quality A second process for giving a transmission opportunity to a mobile station having a service quality threshold exceeding a predetermined service quality threshold; and when there is no mobile station whose required service quality exceeds the service quality threshold, the required service quality is the service quality threshold A program for causing the following mobile station to execute a third process for giving a transmission opportunity and using the past instantaneous wireless channel quality in the second process.

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