JP2008053850A - Apparatus and method of controlling data flow-in quantity - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus and a method for controlling data flow-in quantity while considering an error rate of packet data in a radio zone. <P>SOLUTION: A mobile communication system comprises: a plurality of mobile stations; a control station for relaying packets destined to the mobile stations; and a base station for temporarily storing the packets transmitted from the control station into a buffer and transmitting the packets to the mobile stations. The base station is provided with: an MAC-hs layer processing unit 2032 for acquiring an error rate of the packets destined to the mobile stations in the radio zone; and a data transmission quantity control information calculating unit 2034 for controlling the transmission quantity of data from the control station to the base station on the basis of the error rate of the packets destined to the mobile stations in the radio zone. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a data inflow control device and a data inflow control method.

  Currently, mobile communication systems such as mobile phones that are widely used provide services by dividing the entire service area into wireless zones called cells. As shown in FIG. 1, such a system includes a plurality of base stations that cover a cell, a mobile station that performs communication by setting a radio channel therebetween, a plurality of the base stations, and the mobile stations. Consists of control stations to be managed. In addition, the control station is connected to a trunk network including an exchange device and the like.

  In such a configuration, signal transmission in communication between the trunk network and the mobile station is performed via the control station and the base station. Therefore, the base station that relays the wired section between the trunk network / control station and the base station and the wireless section between the base station and the mobile station temporarily buffers the signal sent from the trunk network / control station. It has a function to do. This buffering function is intended to buffer a signal from a wired section when the transmission speed of the wired section is higher than the transmission speed of the wireless section.

  On the other hand, high-speed and large-capacity downlink high-speed packet communication such as HSDPA (High Speed Downlink Packet Access) and 1x EV-DO has been standardized and developed (for example, see Non-Patent Documents 1 and 2). The main characteristics of such a high-speed packet communication method are the packet transmission format, specifically the packet data size, modulation method, number of codes, code, depending on the radio conditions of the mobile station that is transmitting data. There is a point that an adaptive modulation / decoding method that adaptively changes a conversion rate or the like is used. In this adaptive modulation / demodulation / encoding method, the radio transmission band fluctuates over time according to the radio conditions of the mobile station. For example, in HSDPA, an adaptive modulation / demodulation / coding scheme is performed by controlling the data size, modulation scheme, and number of codes of a packet in accordance with the radio state between a mobile station and a radio base station.

  In addition, in the above HSDPA and 1x EV-DO adaptive modulation / decoding schemes, transmission is performed in a transmission format such that the error rate when packet data is transmitted in the wireless interval is a predetermined value. Fluctuates in accordance with the propagation environment of the wireless section, for example, the moving speed of the mobile device, the number of paths, and the number of base stations that communicate simultaneously. For example, in the case of HSDPA, in general, transmission is performed in a transmission format such that the error rate when packet data is transmitted in a wireless section is 10%, but the actual error rate is 10 to 40%. Therefore, the radio transmission band of each user also varies greatly in time depending on the error rate in the radio section.

  By the way, in the case of the mobile communication system having the above configuration, when the transmission band of the wired section is larger than the transmission band of the wireless section, the data tends to be accumulated in the temporary buffer of the base station to be relayed. When the transmission bandwidth of the wired section is smaller than the bandwidth, the data tends to be depleted in the temporary buffer of the relaying base station. Since the temporary buffer of the relaying base station is finite, the data overflowing the buffer is discarded, and the radio band cannot be used up because the buffer of the relaying base station is exhausted. When there is a difference between the transmission band of the section and the transmission band of the wired section, the transmission efficiency is deteriorated due to signal discard due to buffer overflow, or the wireless transmission band utilization efficiency is decreased due to buffer depletion. In order to avoid these two problems, it is necessary to control the transmission band of the wireless section and the transmission band of the priority section as much as possible.

A method for controlling the amount of data flowing from the control station to the base station based on the amount of data retained in the buffer at the base station from the viewpoint of suppressing signal discard at the base station in communication between the trunk network and the mobile station Has already been proposed (see Patent Document 1 and Patent Document 2), and even in a communication system such as a high-speed packet communication method in which a wireless band greatly fluctuates, degradation of wireless band usage efficiency due to buffer depletion, and A method for preventing deterioration in transmission efficiency of the system due to occurrence of retransmission control due to signal discard due to buffer overflow has been proposed (see Patent Document 3). By using this method, the data inflow amount to the base station can be limited with the buffer retention amount, and the buffer overflow at the base station can be avoided.
3GPP TR25.848 v4.0.0 3GPP2 C. S0024 Rev. 1.0.0 Japanese Patent Application 2000-264390 JP2002-077987 Japanese Patent Application 2003-205404

  However, in the above prior art, since the error rate of packet data in the wireless section as described above is not considered, in a situation where the error rate of packet data in the wireless section varies greatly, the control station appropriately Could not control the amount of data flowing into

  In view of the above problems, an object of the present invention is to provide a data inflow amount control device and a data inflow amount control method that take into consideration the error rate of packet data in a wireless section.

  In order to achieve the above object, a first feature of the present invention is that a plurality of mobile stations, a control station that relays packets addressed to the plurality of mobile stations, and the packet transmitted from the control station are temporarily received. A data inflow control device arranged in a mobile communication system comprising a base station stored in a buffer and transmitted to a plurality of mobile stations, wherein an error rate in a radio section of packets addressed to a plurality of mobile stations Data comprising: an error rate acquisition means to acquire; and a packet transmission amount control means for controlling the transmission amount of data from the control station to the base station based on an error rate in a radio section of packets addressed to a plurality of mobile stations. The gist is that it is an inflow control device.

  According to the data inflow amount control apparatus according to the first feature, it is possible to control the data inflow amount in consideration of the error rate of packet data in the wireless section.

  Further, the data inflow amount control device according to the first feature includes a radio state acquisition unit that acquires radio states of a plurality of mobile stations, a packet transmission frequency calculation unit that calculates transmission frequencies of packets related to the plurality of mobile stations, A buffer retention amount calculating means for calculating the amount of packets waiting to be transmitted to the plurality of mobile stations, which are retained in the buffer in the base station, and the packet transmission amount control means From the control station, based on the state, the error rate in the radio section of the packets addressed to the plurality of mobile stations, the packet transmission frequency for the plurality of mobile stations, and the buffer residence scheduled time for the plurality of mobile stations The amount of packets sent to the base station may be controlled.

  In addition, the inflow amount control device includes: a radio state of a plurality of mobile stations; an error rate in a radio section of a packet addressed to the plurality of mobile stations; a transmission frequency of packets related to the plurality of mobile stations; Buffer scheduled time calculation means for calculating buffer scheduled times for the plurality of mobile stations based on the amount of packets waiting to be transmitted to the mobile station may be further provided.

In addition, the inflow rate control device described above can check the radio state of a plurality of mobile stations n.

The error rate in the radio section of packets addressed to the plurality of mobile stations n is BLER _n , the packet transmission frequency for the plurality of mobile stations n is freq _n, and is retained in the buffer in the base station. The amount of packets waiting to be transmitted to the plurality of mobile stations n is defined as buffer _n , and the buffer retention scheduled time calculation means calculates the buffer retention scheduled time Store_time _n for the plurality of mobile stations n.

Calculated according are calculated from the buffer storing estimated time for the plurality of mobile stations n Store_time _n, further comprising a coefficient calculating means for calculating the coefficients A _n for a plurality mobile stations n, the packet transmission amount control means, said plurality of Mobile radio status

Calculated from an error rate BLER _n in a radio section of packets addressed to the plurality of mobile stations n, a packet transmission frequency freq _n for the plurality of mobile stations, and a buffer retention scheduled time Store_time _n for the plurality of mobile stations n. based on the coefficient a _n is, may control the transmission amount of packets to the base station from said control station.

In addition, the packet transmission amount control means of the inflow amount control device described above, the packet transmission amount from the control station to the base station,

  You may calculate by.

Further, the buffer residence scheduled time calculation means of the inflow amount control device described above is a value obtained by averaging packet transmission frequencies freq _n for the plurality of mobile stations n among the plurality of mobile stations n.

And calculate the buffer retention scheduled time Store_time _n for the plurality of mobile stations n.

The packet transmission amount control means calculates the packet transmission amount from the control station to the base station,

  You may calculate by.

  Further, the error rate acquisition means of the inflow rate control device according to the first feature may use the error rate in the radio section of packets addressed to a plurality of mobile stations as a predetermined set value instead of an actual measurement value.

  Further, the predetermined set value may be controlled based on at least one of the number of base stations with which the mobile station communicates simultaneously, the moving speed of the mobile station, the number of paths, and the radio quality information.

  According to a second aspect of the present invention, a plurality of mobile stations, a control station that relays packets addressed to the plurality of mobile stations, and the packets sent from the control station are temporarily stored in a buffer to store the plurality of mobile stations. A method for controlling the amount of data inflow in a mobile communication system comprising a base station that transmits to a plurality of mobile stations, comprising: (a) acquiring radio states of a plurality of mobile stations; and (b) addressing a plurality of mobile stations. (C) calculating the packet transmission frequency for a plurality of mobile stations; and (d) the plurality of movements staying in a buffer at the base station. A step of calculating an amount of packets waiting to be transmitted to a station; (e) radio conditions of a plurality of mobile stations, an error rate in a radio section of packets addressed to the plurality of mobile stations, and the plurality of mobile stations. Calculating a buffer retention scheduled time for the plurality of mobile stations based on a transmission frequency of packets to be transmitted and an amount of packets waiting to be transmitted to the plurality of mobile stations, and (f) radio states of the plurality of mobile devices And from the control station based on the error rate in the radio section of packets addressed to the plurality of mobile stations, the transmission frequency of the packets related to the plurality of mobile stations, and the buffer retention scheduled time related to the plurality of mobile stations, The gist of the present invention is a data inflow control method including a step of controlling the amount of packets sent to a base station.

  According to the data inflow amount control method according to the second feature, it is possible to control the data inflow amount in consideration of the packet data error rate in the wireless section.

  ADVANTAGE OF THE INVENTION According to this invention, the data inflow amount control apparatus and the data inflow amount control method which considered the error rate of the packet data in a radio area can be provided.

  Next, embodiments of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic.

(Configuration of mobile communication system)
In this embodiment, an embodiment when the present invention is applied to a mobile communication system to which the HSDPA scheme in 3GPP is applied will be described in detail. In the following description, n is the index of the mobile station. The same index is also used for the priority queue related to mobile station n in the base station. That is, the priority queue related to mobile station n in the base station is referred to as priority queue n. This assumes that there is one priority queue for each mobile station. Here, the priority queue is a data queue for buffering packet data related to the mobile station n in the base station.

  In the following description, it is assumed that one priority queue exists for each mobile station, but a plurality of priority queues may exist for each mobile station. In this case, for example, the priority queue n related to the mobile station n is described as priority queue n, k (k is an index of the priority queue).

  FIG. 1 shows the configuration of a mobile communication system to which the HSDPA scheme in 3GPP is applied. In the mobile communication system, the trunk line network 40 including the switching device, the control stations 30, 31, and the base stations 20, 21, 22, 23, 24 are configured in a hierarchy. The mobile stations 10, 11, 12 communicate with the base stations 20, 21 via a wireless line. The control station 30 is a control device that controls the base stations 20, 21, 22 and the mobile stations 10, 11, and the control station 31 is a control device that controls the base stations 23, 24 and the mobile station 12. Note that the configuration of the mobile communication system shown in FIG. 1 is an example, and the number of control stations, base stations, and mobile stations, and the connection form are not limited to this.

  FIG. 2 shows a protocol stack in the mobile communication system shown in FIG. The protocol stack 101 shows a protocol stack of the mobile station, and is composed of a physical layer facing the base station, a MAC-hs layer, a MAC-d layer facing the control station, and a data link layer. The protocol stack 102 indicates the protocol stack of the base station, and is composed of a physical layer facing the mobile station, a MAC-hs layer, and a physical layer facing the control station and a sublayer. A protocol stack 103 indicates a protocol stack of the control station, and includes a physical layer and sublayer facing the base station, and a MAC-d layer and data link layer facing the mobile station. The protocol stack 103 also has a layer facing the main network side.

  In particular, in the protocol stack described above, control information for controlling the data transmission rate when the control station transmits data addressed to the mobile station is transmitted and received between the control station and the base station using the sublayer.

  FIG. 3 is a functional block diagram showing a configuration example of the base stations 20, 21, 22, 23, and 24 shown in FIG. For the mobile station, 0, 1, 2,..., N are used as the index as described above.

  As shown in FIG. 3, the base station includes a wired physical layer processing unit 201, a sublayer processing unit 202, and a wireless physical layer processing unit 203. In FIG. 3, only the part related to the data inflow control method according to the present invention is shown.

  The wired physical layer processing unit 201 is connected to the control station, the sublayer processing unit 202, and the radio physical layer processing unit 203, receives downlink packet data from the control station, and transmits the downlink packet data to the radio physical layer processing unit 203.

  The sublayer processing unit 202 is connected to the wired physical layer processing unit 201 and the wireless physical layer processing unit 203. The sublayer processing unit 202 communicates with the control station regarding control information. In particular, in the present embodiment, the sublayer processing unit 202 controls the transmission amount of packet data transmitted from the control station to the base station regarding the priority queue of each mobile station from the data transmission amount control information calculation unit 2034 described later. The transmission amount control information is received, and the transmission amount control information is notified to the control station via the wired physical layer processing unit 201. Here, the transmission amount control information is called Capacity Allocation or HS-DSCH CAPACITY ALLOCATION (HS-DSCH CAPACITY ALLOCATION Control Frame) in the HSDPA system.

  The radio physical layer processing unit 203 is connected to the sublayer processing unit 202 and the wired physical layer processing unit 201. Buffering processing for buffering downlink packet data received from the wired physical layer processing unit 201, scheduling processing for selecting a mobile station to allocate a shared channel (HS-PDSCH) in the TTI, Transmission processing of the shared channel (HS-PDSCH as a physical channel) is performed. Here, the transmission processing of the shared channel is, for example, channel coding, spreading processing, frequency conversion processing for conversion to a radio frequency band, amplification processing, or the like. In the above description, only downlink processing according to the present invention is described, but the radio physical layer processing unit 203 also performs processing such as uplink demodulation and decoding processing.

  The radio physical layer processing unit 203 performs data transmission amount control information calculation processing for calculating transmission amount control information for controlling the transmission amount of packet data transmitted from the control station to the base station.

  Next, the configuration of the radio physical layer processing unit 203 will be described in detail. The radio physical layer processing unit 203 includes a buffer unit 2031, a MAC-hs layer processing unit 2032, a layer 1 processing unit 2033, and a data transmission amount control information calculation unit 2034 as shown in FIG. In addition, the said structure extracts only the part which concerns on this invention, and has omitted the part which is not related to this invention.

  The buffer unit 2031 is connected to the wired physical layer processing unit 201, the MAC-hs layer processing unit 2032, and the data transmission amount control information calculation unit 2034.

  The buffer unit 2031 performs buffering for temporarily storing packet data received from the wired physical layer processing unit 201 and transmitted from the control station to the base station. Specifically, packet data is buffered for each priority queue n for each mobile station n. When there are a plurality of priority queues n, k for the mobile station n, packet data is buffered for each of the plurality of priority queues n, k for the mobile station n.

  Then, the buffer unit 2031 acquires, from the MAC-hs layer processing unit 2032, information regarding the mobile station to which the shared channel (HS-PDSCH) is allocated in the TTI, its priority queue, and the data size of the shared channel, The packet data in the priority queue transmitted in the TTI, that is, the packet data in the priority queue corresponding to the data size of the shared channel is transmitted to the MAC-hs layer processing unit 2032.

Further, the buffer unit 2031 calculates the amount of packet data buffer _n staying in the priority queue n for each mobile station n, and notifies the data transmission amount control information calculation unit 2034 of the amount of packet data buffer _n. .

  The MAC-hs layer processing unit 2032 is connected to the layer 1 processing unit 2033, the buffer unit 2031, and the data transmission amount control information calculation unit 2034.

  The MAC-hs layer processing unit 2032 performs a scheduling process of selecting a mobile station to which a shared channel (HS-PDSCH) is allocated in the TTI and its priority queue. That is, a priority queue for transmitting packet data in the TTI is selected from all priority queues. In this case, the base station transmits a shared channel (HS-PDSCH in the case of HSDPA) to the mobile station corresponding to the selected priority queue in the TTI. Examples of the scheduling processing algorithm include Round robin, Proportional Fairness, and MAX C / I.

  Next, the MAC-hs layer processing unit 2032 receives the downlink radio quality information from the layer 1 processing unit 2033, and assigns a shared channel in the TTI, and the radio quality information of the mobile station corresponding to the priority queue selected. And the transmission format of the shared channel in the TTI based on the radio resources available in the TTI.

  Then, the MAC-hs layer processing unit 2032 notifies the buffer unit 2031 of information related to the data size of the mobile station selected when the shared channel is allocated in the TTI, its priority queue, and the transmission format of the shared channel. To do. Here, the radio quality information indicates a channel quality indicator (CQI) in HSDPA. Alternatively, an index other than CQI, for example, CPICH Ec / N0 or CPICH RSCP may be used as the wireless quality information. The radio resources that can be used in the TTI are, for example, code resources, power resources, and hardware resources. Furthermore, the transmission format of the shared channel in the TTI refers to, for example, a data size (transport block size), a modulation scheme, the number of HS-PDSCH codes, HS-PDSCH transmission power, and the like.

  Further, the MAC-hs layer processing unit 2032 transmits the information on the transmission format of the shared channel and the packet data transmitted in the TTI received from the buffer unit 2031 to the layer 1 processing unit 2033.

  Further, the MAC-hs layer processing unit 2032 calculates the allocation frequency of the shared channel for each priority queue n for each mobile station n, that is, the packet transmission frequency.

The calculation of the packet transmission frequency freq _n is, for example,
freq _n (t) = τ ・ freq _n (t-1) + (1-τ) ・ Allocated _n
Allocated _n : A value that is 1 when a shared channel is assigned to priority queue n in TTI, and 0 when it is not assigned. Τ: This is based on the forgetting factor given as a parameter. At this time, τ is a parameter that controls the size of the measurement interval for measuring the transmission frequency of the packet. When τ is close to 1, the measurement interval of the packet allocation frequency can be increased. It is possible to perform data inflow control in consideration of a long time interval.

Further, the calculation of the packet transmission frequency is, for example, _assuming that the packet transmission frequency in the TTI t is freq _n (t).

Allocated _n (x): Value that is 1 when a shared channel is allocated to priority queue n in TTI, and 0 when it is not allocated
T ₁ : Performed based on the averaging interval given as a parameter. At this time, T ₁ is a parameter for controlling the size of the measurement interval for measuring the packet allocation frequency, and when T ₁ is set large, the packet allocation frequency measurement interval can be increased, Data inflow control can be performed in consideration of longer time intervals.

Furthermore, the MAC-hs layer processing unit 2032 calculates the error rate of the shared channel for each priority queue n for each mobile station n, that is, the packet error rate BLER _n . The packet error rate BLER _n may be an actual measured value or a predetermined set value. The predetermined set value is controlled based on at least one of the number of base stations with which the mobile station communicates simultaneously, the moving speed of the mobile station, the number of paths, and the radio quality information.

For example, the calculation of the error rate BLER _n of the packet is, for example, that the error rate of the packet in the TTI t is BLER _n (t),

Allocated _n (x): Value that is 1 when a shared channel is allocated to priority queue n in TTI, and 0 when it is not allocated
NACK _n (x): A value that is 0 when a shared channel is assigned to priority queue n in TTI and ACK is received as acknowledgment information for the shared channel in the uplink, and 1 otherwise.
T ₂ : Performed based on the averaging interval given as a parameter. Note that the acknowledgment information for the shared channel is transmitted from the mobile station using the dedicated control channel HS-DPCCH in the uplink in HSDPA. The MAC-hs layer processing unit receives the delivery confirmation information from the layer 1 processing unit 2033.

T ₂ is a parameter that controls the size of the measurement interval for measuring the packet error rate. In the above equation, but calculates the packet error rate BLER _n (t) for every TTI, may be calculated _n (t) error rate BLER packets at predetermined time intervals. For example, assuming that the value of T ₂ is 1 second and the predetermined time interval is 0.1 second, the packet error rate BLER _n is set every 1 second, with 1 second temporally preceding the TTI t as an averaging interval. (t) will be calculated.

The calculation of the error rate BLER _n (t) of the packet is performed, for example, by assigning a shared channel to the priority queue n related to the mobile station n, and sending an acknowledgment ACK or NACK for the shared channel in the uplink. If received,
BLER _n (m) = α ・ BLER _n (m-1) + (1-α) ・ NACK _n
m: Number incremented by one when a shared channel is assigned to priority queue n for mobile station n
NACK _n : A value assigned to a shared channel for priority queue n and 0 when receiving an ACK for the shared channel in the uplink, 1 otherwise. Α: Forgetting factor given as a parameter. It may be calculated based on.

For example, in the TTI, if a shared channel is assigned to the priority queue n for the mobile station n, m is incremented by 1 and m = 23 is set, and an ACK for the shared channel is received. The error rate BLER _n (t) of the above packet is
BLER _n (23) = α ・ BLER _n (22) + (1-α) ・ 0
Is calculated. Also, for example, in the TTI, a shared channel is allocated to the priority queue n for the mobile station n, the value of m is incremented by 1 and set to m = 23, and a NACK for the shared channel is received. Then, the error rate BLER _n (t) of the above packet is
BLER _n (23) = α ・ BLER _n (22) + (1-α) ・ 1
Is calculated. Further, for example, in the TTI, a shared channel is assigned to the priority queue n related to the mobile station n, the value of m is incremented by 1 and set to m = 23, and both the ACK and NACK for the shared channel are set. If not received, the error rate BLER _n (t) of the above packet is
BLER _n (23) = α ・ BLER _n (22) + (1-α) ・ 1
Is calculated.

  In the above example, the packet error rate for one transmission in the physical layer is calculated without considering the number of transmissions in H-ARQ. Instead, the number of transmissions in H-ARQ is considered. Thus, the packet error rate may be calculated. For example, an error rate relating to packet data (first-time transmission packet data) transmitted for the first time in H-ARQ may be calculated as the packet error rate. Alternatively, an error rate related to packet data transmitted first and second times in H-ARQ may be calculated as the packet error rate.

  Furthermore, the MAC-hs layer processing unit 2032 calculates a transmission rate that can be transmitted in the radio section for each priority queue n for each mobile station n.

Here, the transmission rate that can be transmitted in the radio section for each priority queue n in the TTI

For example, the calculation of

(0 ≦ δ ≦ 1)
It is done using. here,

Is an instantaneous transmission rate calculated from radio quality information (CQI) related to mobile station n and available radio resources. Also,

Indicates the average transmission rate that can be transmitted in the radio section for each priority queue n in the TTI,

  Indicates an average transmission rate that can be transmitted in the radio section for each priority queue n in the TTI immediately before the TTI.

Further, δ is a forgetting factor for averaging. By controlling the value of δ, the average transmission rate that can be transmitted in the radio section for each priority queue n

  It is possible to control the averaging interval for calculating. For example, when a value close to 1 is set as the value of δ, it is possible to calculate a transmission rate that can be transmitted in a long-averaged wireless section, and when the value of δ is set to 0, An instantaneous value of a transmission rate that can be transmitted in the wireless section can be calculated.

For example, the above

Is the data size estimated to be transmittable at a predetermined error rate from the radio quality information CQI, the transmission power that can be allocated to the shared channel HS-PDSCH, and the number of codes that can be allocated to the shared channel HS-PDSCH. Represents that. For example, when the predetermined error rate is 10%, the base station transmits the transmission rate to the mobile station n in the TTI.

  The error rate when transmitting packet data of the data size corresponding to is about 10%.

In addition, the transmission speed that can be transmitted in the radio section for each priority queue n described above

This calculation is performed on the assumption that the shared channel is allocated to the mobile station n in all TTIs without considering the shared channel allocation frequency. In other words, a transmission rate that can be transmitted in the wireless section.

  Is a value corresponding to the radio state or radio quality in the downlink between the base station and the mobile station n.

The MAC-hs layer processing unit 2032 assigns the shared channel for each priority queue n for each mobile station n, that is, the packet transmission frequency freq _n and the shared channel for each priority queue n for each mobile station n. Transmission rate that can be transmitted in the radio section for each priority queue n for error rate BLER _n and each mobile station n

  Is transmitted to the data transmission amount control information calculation unit 2034.

  The layer 1 processing unit 2033 is connected to the MAC-hs layer processing unit 2032 and the antenna.

  The layer 1 processing unit 2033 receives, from the MAC-hs layer processing unit 2032, information on the transmission format of the shared channel transmitted in the TTI and packet data mapped to the shared channel, and based on the information on the transmission format Then, transmission processing of the shared channel transmitted to the radio section is performed in the TTI. Specifically, turbo encoding and spreading processing of packet data mapped to the shared channel, frequency conversion processing for converting to a radio frequency band, amplification processing, and the like are performed. And the signal of the said shared channel is transmitted to a radio area via an antenna after performing the said transmission process.

  The layer 1 processing unit 2033 also has a function of receiving, demodulating, and decoding downlink radio quality information (CQI) that is mapped and reported from each mobile station to the uplink control channel (HS-DPCCH). . The downlink radio quality information regarding each mobile station is transmitted to the MAC-hs layer processing unit 2032.

  Further, the layer 1 processing unit 2033 receives the downlink shared channel acknowledgment information (ACK / NACK) reported from each mobile station by being mapped to the uplink control channel (HS-DPCCH). It also has a decoding function. The acknowledgment information on the downlink shared channel is transmitted to the MAC-hs layer processing unit 2032.

  The data transmission amount control information calculation unit 2034 is connected to the buffer unit 2031, the MAC-hs layer processing unit 2032, and the sublayer processing unit 202.

The data transmission amount control information calculation unit 2034 indicates the amount of packet data buffer _n staying in the priority queue n related to each mobile station n from the buffer unit 2031 and the priority related to each mobile station _n from the MAC-hs layer processing unit 2032 Allocation frequency of shared channel for each queue n, that is, packet transmission frequency freq _n , and error rate of shared channel for each priority queue n for each mobile station n, that is, packet error rate BLER _n and each movement Transmission rate that can be transmitted in the radio section for each priority queue n for station n

  Receive.

The data transmission amount control information calculation unit 2034 then assigns the amount of packet data buffer _n remaining in the priority queue n for each mobile station n and the allocation of the shared channel for each priority queue n for each mobile station n. Frequency, that is, packet transmission frequency freq _n , shared channel error rate for each priority queue n for each mobile station n, that is, packet error rate BLER _n, and radio section for each priority queue n for each mobile station n Transmission speed that can be transmitted

Based on the above, the transmission amount control information for controlling the transmission amount of the packet data transmitted from the control station to the base station, that is, the transmission rate CA _n specified in Capacity Allocation is determined.

For example, the data transmission amount control information calculation unit 2034 sets the buffer retention scheduled time Store_time _n for the priority queue n for each mobile station _n.

Based on the buffer retention scheduled time Store_time _n value, the coefficient _An is determined, and the transmission amount control information for controlling the amount of packet data transmitted from the control station to the base station, that is, Capacity Allocation The transmission rate CA _n specified in

You may calculate based on. Here, as a method for calculating the coefficient _An , a reference table as shown in FIG. 5 may be used. For example, the value of the buffer storing estimated time Store_time _n is in the case of 300 ms is set the value of the coefficient A _n is 0.6.

In the above example, the packet error rate BLER _n was used in both the calculation of the buffer retention scheduled time Store_time _{n and} the calculation of the transmission rate CA _n specified in the Capacity Allocation. The packet error rate BLER _n may be used for only one calculation. For example, when the packet error rate BLER _n is used only for the calculation of the buffer retention scheduled time Store_time _n ,

Is calculated. Also, for example, when the packet error rate BLER _n is used only for calculating the transmission rate CA _n specified in the Capacity Allocation,

  Is calculated.

Further, in the above-described example, the packet error rate BLER _n is used, but the packet ACK rate ACK _n may be used instead. Here, the packet ACK rate is
ACK _n = 1-BLER _n
It becomes.

Further, for example, the data transmission amount control information calculation unit 2034 may calculate the frequency Freq n of the shared channel allocation frequency for each priority queue n related to each mobile station n, that is, a value Freq obtained by averaging the packet transmission frequency freq _n between the mobile stations.

After calculating, the buffer retention scheduled time Store_time _n for the priority queue n for each mobile station _n

, And based on the value of Store_time _n , the coefficient _An is determined, and transmission amount control information for controlling the transmission amount of packet data transmitted from the control station to the base station, that is, the transmission specified in Capacity Allocation Rate CA _n ,

  You may calculate based on.

  The Freq is a service type, contract type, receiver type (RAKE receiver, equalizer, reception diversity, interference canceller, and other UE Capability related to packet data in the priority queue n for the mobile station n. (An index classified according to a receivable modulation scheme, the number of receivable codes, the number of bits, etc.), etc.), may be calculated for each priority class type.

  For example, the service type indicates a type of service that transmits downlink packet data, and includes, for example, a VoIP service, a voice service, a streaming service, an FTP service, and the like. The contract type indicates the type of contract to which the user of the destination mobile station of the downlink packet data has subscribed, and includes, for example, a Low Class contract and a High Class contract. In addition, the terminal type classifies the performance of the destination mobile station for downlink packet data, such as a class based on mobile station identification information, a RAKE reception function, an equalizer, a reception diversity, an interference canceller, etc. It includes presence / absence or type, receivable modulation method, terminal capability such as code number, bit number, and the like. Furthermore, the priority class indicates a priority related to transmission of downlink packet data. For example, the downlink packet data having the first priority is the downlink packet having the second priority. It is transmitted with priority over data.

Further, for example, the data transmission amount control information calculation unit 2034 does not consider the shared channel allocation frequency for each priority queue n for each mobile station n, that is, the packet transmission frequency freq _n, and does not take into account the priority queue for each mobile station n. For n, the estimated buffer retention time Store_time _n

, And based on the value of Store_time _n , the coefficient _An is determined, and transmission amount control information for controlling the transmission amount of packet data transmitted from the control station to the base station, that is, the transmission specified in Capacity Allocation Rate CA _n ,

  You may calculate based on.

Further, for example, the data transmission amount control information calculation unit 2034 may use the shared channel allocation frequency for each priority queue n for each mobile station n, that is, the packet transmission frequency freq _n , instead of the mobile station performing communication. The number N may be used to calculate the buffer retention scheduled time and transmission amount control information for controlling the amount of packet data transmitted from the control station to the base station. That is, the data transmission amount control information calculation unit 2034 performs the buffer retention scheduled time Store_time _n for the priority queue n for each mobile station _n.

, And based on the value of Store_time _n , the coefficient _An is determined, and transmission amount control information for controlling the transmission amount of packet data transmitted from the control station to the base station, that is, the transmission specified in Capacity Allocation Rate CA _n ,

  You may calculate based on. Here, the number N of mobile stations performing communication is the total number of mobile stations in which packet data to be transmitted exists in the priority queue. Alternatively, the number N of mobile stations performing communication may be the total number of mobile stations in which the dedicated channel A-DPCH attached to the shared channel (HS-PDSCH) is set.

The data transmission amount control information calculation unit 2034 transmits the transmission amount control information for controlling the transmission amount of packet data transmitted from the control station to the base station, that is, the transmission rate CA _n specified in the Capacity Allocation. Notify

  FIG. 6 is a functional block diagram showing a configuration example of the control stations 30 and 31 shown in FIG. The control station includes a wired physical layer processing unit 301 that communicates with the base station, a sublayer processing unit 302 that communicates with the base station and control information, a data link layer processing unit 303 that communicates with the mobile station, a mobile station, A signal processing unit 304 that performs signal relay processing and buffering between the trunk networks, and a trunk network layer processing unit 305 that communicates with the trunk network are provided.

  The wired physical layer processing unit 301 communicates with the base station. In this embodiment, the wired physical layer processing unit 301 is connected to the base station via a wired link.

  The sublayer processing unit 302 performs communication regarding control information with the base station. In particular, in the present embodiment, the transmission amount control for controlling the transmission amount of packet data transmitted from the control station to the base station regarding the priority queue n of each mobile station n, notified from the sublayer processing unit 202 in the base station. Process information.

  Specifically, the sublayer processing unit 302 transmits transmission amount control information notified from the sublayer processing unit 202 in the base station, that is, information (Capacity Allocation) indicating a data transmission rate when transmitting data addressed to the mobile station n , And the transmission rate of packet data sent from the control station to the base station based on the information (Capacity Allocation) indicating the data sending rate when sending the data addressed to the mobile station n, that is, the data sending rate To control.

  The data link layer processing unit 303 communicates with the mobile station n, and the signal processing unit 304 relays voice signals and data such as packets transmitted and received between the mobile station n and the trunk network. Is. The trunk network layer processing unit 305 communicates with the trunk network.

  In the above-described embodiment, the functions of the MAC-hs layer processing unit 2032 and the layer 1 processing unit 2033 are configured so that the error rate acquisition unit, the radio state acquisition unit, the packet transmission frequency calculation unit, and the buffer retention amount calculation unit The function of the control information calculation unit 2034 corresponds to the data inflow amount control means.

  Moreover, in the said embodiment, a base station and a control station respond | correspond to a data inflow amount control apparatus.

(Data inflow control method)
Next, the operation of the data inflow control method according to the present invention will be described using the flowchart shown in FIG.

In step S101, the MAC-hs layer processing unit 2032 of the radio physical layer processing unit 203 transmits a transmission rate that can be transmitted in the radio section for each priority queue n regarding the mobile station n.

Is calculated.
In step S102, the MAC-hs layer processing unit 2032 of the radio physical layer processing unit 203 calculates a shared channel allocation frequency for each priority queue n for the mobile station n, that is, a packet transmission frequency freq _n .

In step S103, the MAC-hs layer processing unit 2032 of the radio physical layer processing unit 203 calculates the error rate of the shared channel for each priority queue n regarding the mobile station n, that is, the packet error rate BLER _n .

In step S104, the buffer unit 2031 of the radio physical layer processing unit 203 calculates the amount of packet data buffer _n staying in the priority queue n for the mobile station n.

In step S105, the data transmission amount control information calculation unit 2034 of the radio physical layer processing unit 203 performs the buffer retention scheduled time Store_time _n for the priority queue n for each mobile station _n.

  Is calculated.

In step S106, the data transmission amount control information calculation unit 2034 of the radio physical layer process unit 203, based on the buffer storing estimated time Store_time _n of a priority queue n of each mobile station n, about the priority queue n of each mobile station n The coefficient _An is calculated.

In step S107, the data transmission amount control information calculation unit 2034 of the radio physical layer processing unit 203 controls the transmission amount of packet data transmitted from the control station to the base station for each priority queue n for each mobile station n. Quantity control information, that is, the sending rate CA _n specified in Capacity Allocation

  Is calculated.

  In step S108, the sublayer processing unit 202 of the base station controls transmission amount control information (Capacity Allocation) for controlling the transmission amount of packet data transmitted from the control station to the base station regarding the priority queue n of each mobile station n. Notify the station.

  In step S109, the sublayer processing unit 302 of the control station relates to the priority queue n of each mobile station n based on transmission amount control information (Capacity Allocation) for controlling the transmission amount of packet data transmitted from the control station to the base station. The transmission rate of packet data from the control station to the base station is controlled.

Here, in the example described above, in step S104, the buffer retention scheduled time Store_time _n for the priority queue n for each mobile station n is set as follows:

In step S106, for each priority queue n for each mobile station n, transmission amount control information for controlling the amount of packet data transmitted from the control station to the base station, that is, the value CA of Capacity Allocation _n ,

Instead, in step S105, the buffer retention scheduled time Store_time _n for the priority queue n for each mobile station _n is

(Here, Freq is the frequency of shared channel allocation for each priority queue n for each mobile station n, that is, a value obtained by averaging packet transmission frequency freq _n among mobile stations)
In step S107, for each priority queue n for each mobile station n, specify in the transmission amount control information for controlling the transmission amount of packet data transmitted from the control station to the base station, that is, specified in Capacity Allocation Send rate CA _n

  You may calculate using.

Alternatively or alternatively, in step S105, the buffer retention scheduled time Store_time _n for the priority queue n for each mobile station _n is

In step S107, for each priority queue n for each mobile station n, the transmission amount control information for controlling the transmission amount of packet data transmitted from the control station to the base station, that is, specified in Capacity Allocation Send rate CA _n

  You may calculate using.

Further or alternatively, in step S102, instead of the shared channel allocation frequency for each priority queue n for each mobile station n, that is, instead of the packet transmission frequency freq _n , the number N of mobile stations performing communication N To calculate
In step S105, the estimated buffer residence time Store_time _n for the priority queue n for each mobile station _n ,

To calculate
In step S107, for each priority queue n for each mobile station n, transmission amount control information for controlling the transmission amount of packet data transmitted from the control station to the base station, that is, the transmission rate CA _n specified in Capacity Allocation,

  You may calculate using. Here, the number N of mobile stations performing communication is the total number of mobile stations in which packet data to be transmitted exists in the priority queue. Alternatively, the number N of mobile stations performing communication may be the total number of mobile stations in which the dedicated channel A-DPCH attached to the shared channel (HS-PDSCH) is set.

(Function and effect)
According to the present embodiment as described above, the data inflow amount can be controlled in consideration of the packet data error rate in the wireless section.

  That is, for the priority queue n for each mobile station n, the radio state of each mobile station n, the frequency with which the shared channel is transmitted to each mobile station, and errors in the radio section between each mobile station and the base station Based on the rate, it is possible to appropriately control the amount of packets sent from the control station to the base station, deterioration of radio band usage efficiency due to buffer depletion, and retransmission control due to signal discard due to buffer overflow, etc. It is possible to prevent the transmission efficiency of the system from deteriorating due to the occurrence of this.

(Example of change)
In the embodiment described above, the MAC-hs layer processing unit 2032 reports the delivery rate that the mobile station reports the calculation of the error rate of the shared channel for each priority queue n for each mobile station n, that is, the packet error rate BLER _n. This was done by obtaining the error rate of the shared channel HS-DSCH based on the information (ACK / NACK). However, calculating the packet error rate as described above for each mobile station causes an increase in the complexity of the apparatus.

On the other hand, the adaptive modulation / decoding method in HSDPA determines the transmission format of packet data so that a predetermined error rate is obtained. Originally, the packet error rate BLER _n is an almost constant error rate. Is expected to be. Also, it is possible to assume that the packet error rate BLER _n is different from the assumed error rate, depending on the presence or absence of the Inter-Node B HO state, the moving speed, and the number of paths.

Therefore, in the modified example of the present invention described below, the error rate of the shared channel, that is, not the actual measurement value, the presence / absence of the Inter-Node B HO state, the moving speed, the number of paths, and the CQI value Data inflow control is performed using a value assumed based on the packet error rate BLER _n as a feature.

The functional configuration in this modified example is the same as in the above embodiment, and the difference is that in the MAC-hs layer processing unit 2032, the error rate of the shared channel for each priority queue n for each mobile station n, that is, the packet error Only the function to calculate the rate BLER _n . Therefore, in the following, only the function for calculating the error rate of the shared channel for each priority queue n for each mobile station n in the MAC-hs layer processing unit 2032, that is, the error rate BLER _{n of the} packet will be described. Will be omitted.

The MAC-hs layer processing unit 2032 calculates the error rate of the shared channel for each priority queue n for each mobile station n, that is, the packet error rate BLER _n .

For example, the MAC-hs layer processing unit 2032 holds the value A and the value B as the packet error rate, and the associated dedicated channel A-DPCH performs Inter-Node B HO for the mobile station n. ,
BLER _n = A
When the accompanying dedicated channel A-DPCH does not perform Inter-Node B HO,
BLER _n = B
It is good. For example, when the accompanying dedicated channel A-DPCH is performing Inter-Node B HO, it is assumed that the error rate is bad, and A = 0.50 is set, and the accompanying dedicated channel A-DPCH is set to Inter -If Node B HO is not performed, B = 0.20 may be set assuming that the error rate is good.

Further, for example, the MAC-hs layer processing unit 2032 holds the value A and the value B as the packet error rate, and when the number of paths in the downlink propagation environment related to the mobile station n is larger than a predetermined threshold,
BLER _n = A
When the number of downlink propagation environment paths for mobile station n is smaller than a predetermined threshold,
BLER _n = B
It is good. For example, when the predetermined threshold value is 3, and the number of paths in the downlink propagation environment related to the mobile station n is larger than 3, assuming that the error rate is bad, A = 0.50 is set, and the mobile station If the number of paths in the downlink propagation environment for n is 3 or less, B = 0.20 may be set assuming that the error rate is good.

Further, for example, the MAC-hs layer processing unit 2032 holds the value A and the value B as the packet error rate, and when the moving speed of the mobile station n is larger than a predetermined threshold,
BLER _n = A
When the moving speed of the mobile station n is smaller than a predetermined threshold,
BLER _n = B
It is good. For example, when the predetermined threshold is 30 km / h and the moving speed of the mobile station n is higher than 30 km / h, the error rate is assumed to be bad, and A = 0.50 is set. When the moving speed of n is 30 km / h or less, B = 0.20 may be set assuming that the error rate is good. Here, the moving speed of the mobile station n may be estimated, for example, by measuring a time correlation of dedicated pilot symbols mapped to an uplink dedicated physical control channel related to the mobile station n.

Further, for example, the MAC-hs layer processing unit 2032 holds the value A and the value B as the packet error rate, and when the CQI value reported by the mobile station n is larger than a predetermined threshold,
BLER _n = A
When the CQI value reported by mobile station n is smaller than a predetermined threshold,
BLER _n = B
It is good. For example, when the predetermined threshold value is 20, and the CQI value reported by the mobile station n is smaller than 20, assuming that the error rate is bad, A = 0.50 is set, and the mobile station n report If the CQI value to be used is 20 or more, B = 0.20 may be set assuming that the error rate is good. Here, the CQI value is a value corresponding to the radio quality information.

Next, the operation of the data inflow control method according to the modified example of the present invention is the same as that of the above embodiment, and the difference is that the error rate BLER _n of the packet for each priority queue n for the mobile station n in step S103. It is only about the calculation method.

Therefore, in the following, a flowchart will be described only with respect to a method for calculating the packet error rate BLER _n .

The operation of the packet error rate BLER _n calculation method according to the modification of the present invention will be described with reference to the flowchart shown in FIG.

  In step S201, the MAC-hs layer processing unit 2032 determines whether or not the associated dedicated channel A-DPCH related to the mobile station n is in the Inter-Node B HO state, and the associated dedicated channel A-DPCH related to the mobile station n is determined. Is determined to be in the Inter-Node B HO state, the process proceeds to step S202. If it is determined that the associated dedicated channel A-DPCH related to the mobile station n is not in the Inter-Node B HO state, the process proceeds to step S203. move on.

In step S202, the MAC-hs layer processing unit 2032 sets BLER _n = 0.50 assuming that the error rate is bad.

In step S203, the MAC-hs layer processing unit 2032 sets BLER _n = 0.20 on the assumption that the error rate is good.

As another example, the operation of the packet error rate BLER _n calculation method according to the modification of the present invention will be described with reference to the flowchart shown in FIG.

  In step S301, the MAC-hs layer processing unit 2032 determines whether or not the number of paths in the downlink propagation environment related to the mobile station n is greater than a predetermined threshold, and determines the downlink propagation environment related to the mobile station n. If it is determined that the number of paths is larger than the predetermined threshold, the process proceeds to step S302, and if it is determined that the number of paths in the downlink propagation environment related to the mobile station n is not larger than the predetermined threshold, Proceed to S303.

In step S302, the MAC-hs layer processing unit 2032 sets BLER _n = 0.50 assuming that the error rate is poor.

In step S303, the MAC-hs layer processing unit 2032 sets BLER _n = 0.20 on the assumption that the error rate is good.

As still another example, the operation of the packet error rate BLER _n calculation method according to the modification of the present invention will be described with reference to the flowchart shown in FIG.

  In step S401, the MAC-hs layer processing unit 2032 determines whether or not the moving speed of the mobile station n is greater than a predetermined threshold, and determines that the moving speed of the mobile station n is greater than a predetermined threshold. In this case, the process proceeds to step S402. If it is determined that the moving speed of the mobile station n is not greater than a predetermined threshold value, the process proceeds to step S403.

In step S402, the MAC-hs layer processing unit 2032 sets BLER _n = 0.50 assuming that the error rate is poor.

In step S403, the MAC-hs layer processing unit 2032 sets BLER _n = 0.20 on the assumption that the error rate is good.

As still another example, the operation of the packet error rate BLER _n calculation method according to the modification of the present invention will be described with reference to the flowchart shown in FIG.

  In step S501, the MAC-hs layer processing unit 2032 determines whether the CQI value reported by the mobile station n is smaller than a predetermined threshold value, and the CQI value reported by the mobile station n is equal to the predetermined threshold value. If it is determined that the CQI value reported by the mobile station n is not smaller than a predetermined threshold value, the process proceeds to step S503.

In step S502, the MAC-hs layer processing unit 2032 sets BLER _n = 0.50 assuming that the error rate is poor.

In step S503, the MAC-hs layer processing unit 2032 sets BLER _n = 0.20 on the assumption that the error rate is good.

(Other embodiments)
Although the present invention has been described according to the above-described embodiments, it should not be understood that the descriptions and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

For example, the MAC-hs layer processing unit 2032 and the data transmission amount control information calculation unit 2034 of the wireless physical layer processing unit 203 are programmable devices that can rewrite programs such as a CPU, a digital signal processor (DSP), or an FPGA, for example. in the configuration, the program of the evaluation function described above in a predetermined memory area is stored, the parameters (δ, τ, α, T 1, T 2, see table for obtaining a factor a _n) is configured to rewrite download Be taken. At this time, the parameters (δ, τ, α, T 1, T 2, see table for obtaining the coefficient A _n) may be downloaded from the upper node of the base station, MAC-hs layer process unit 2032 and the data transmission amount control information calculation unit 2034 is provided a terminal I / F (external interface function), directly from the terminal the parameters (δ, τ, α, T 1, T 2, see table for obtaining the coefficients a _n ) May be read.

  Each functional block of the wireless physical layer processing unit 203 described above may be divided by hardware, or may be divided as software by a program on a processor.

  Further, although the above embodiment has been described with respect to the high-speed packet transmission method HSDPA in 3GPP, the present invention is not limited to the above HSDPA, and other control of data inflow amount of downlink packet data in the mobile communication system ( It can be applied to a high-speed packet transmission system that performs flow control. For example, cdma2000 1xEV-DO in 3GPP2, TDD scheme in 3GPP, high-speed packet transmission scheme in Long Term Evolution (Super 3G), and the like can be cited as other high-speed packet transmission schemes.

  As described above, the present invention naturally includes various embodiments not described herein. Therefore, the technical scope of the present invention is defined only by the invention specifying matters according to the scope of claims reasonable from the above description.

1 is an overall configuration diagram of a mobile communication system according to an embodiment. It is a figure which shows the protocol stack in the mobile communication system which concerns on this embodiment. It is a functional block diagram of the base station which concerns on this embodiment. It is a functional block diagram which shows the detail of the radio | wireless physical layer process part of FIG. It is an example of the reference table for calculating | requiring the coefficient _An which concerns on this embodiment. It is a functional block diagram of the control station which concerns on this embodiment. It is a flowchart which shows the data injection amount control method which concerns on this embodiment. It is a flowchart showing a method of calculating the error rate BLER _n of packets according to the embodiment (Part 1). It is a flowchart illustrating a method of calculating the error rate BLER _n of packets in accordance with the present embodiment (Part 2). It is a flowchart showing a method of calculating the error rate BLER _n of packets according to the embodiment (Part 3). It is a flowchart showing a method of calculating the error rate BLER _n of packets according to the embodiment (Part 4).

Explanation of symbols

10,11,12… Mobile station
20,21,22,23,24… Base station
30,31 ... Control station
40 ... Trunk network
201 ... Wired physical layer processing unit
202 ... Sublayer processing section
203 ... Wireless physical layer processing unit
301 ... Wired physical layer processing unit
302 ... Sublayer processing unit
303: Data link layer processing section
304: Signal processor
305 ... Trunk network layer processing section
2031 ... Buffer section
2032… MAC-hs layer processing part
2033 ... Layer 1 processing unit
2034: Data transmission amount control information calculation unit

Claims (9)

A plurality of mobile stations; a control station that relays packets addressed to the plurality of mobile stations; a base station that temporarily stores the packets transmitted from the control station in a buffer and transmits the packets to the plurality of mobile stations; A data inflow control device arranged in a mobile communication system comprising:
Error rate acquisition means for acquiring an error rate in a radio section of packets addressed to the plurality of mobile stations;
A packet transmission amount control means for controlling a transmission amount of data from the control station to the base station based on an error rate in a radio section of packets addressed to the plurality of mobile stations; Control device. Radio status acquisition means for acquiring radio statuses of the plurality of mobile stations;
A packet transmission frequency calculating means for calculating a packet transmission frequency for the plurality of mobile stations;
Buffer retention amount calculating means for calculating the amount of packets waiting to be transmitted to the plurality of mobile stations, which are retained in the buffer in the base station,
The packet transmission amount control means includes a radio state of the plurality of mobile stations, an error rate in a radio section of packets addressed to the plurality of mobile stations, a packet transmission frequency regarding the plurality of mobile stations, and the plurality of movements. 2. The data inflow amount control device according to claim 1, wherein the amount of packets sent from the control station to the base station is controlled based on a buffer retention scheduled time for the station.   The radio state of the plurality of mobile stations, the error rate in the radio section of packets addressed to the plurality of mobile stations, the transmission frequency of packets related to the plurality of mobile stations, and the amount of packets waiting to be transmitted to the plurality of mobile stations The data inflow amount control device according to claim 2, further comprising: a buffer dwell time calculation unit that calculates a buffer dwell time for the plurality of mobile stations based on The radio states of the plurality of mobile stations n

The error rate in the radio section of packets addressed to the plurality of mobile stations n is BLER _n , the packet transmission frequency for the plurality of mobile stations n is freq _n, and is retained in the buffer in the base station. The amount of packets waiting to be transmitted to the plurality of mobile stations n is buffer _n ,
The buffer retention scheduled time calculation means calculates a buffer retention scheduled time Store_time _n for the plurality of mobile stations n.

According to
Wherein is calculated from a plurality of buffer storing estimated time for the mobile station n Store_time _n, further comprising a coefficient calculating means for calculating the coefficients A _n relates the plurality mobile stations n,
The packet transmission amount control means is configured to control a wireless state of the plurality of mobile devices.

Calculated from an error rate BLER _n in a radio section of packets addressed to the plurality of mobile stations n, a packet transmission frequency freq _n for the plurality of mobile stations, and a buffer retention scheduled time Store_time _n for the plurality of mobile stations n. is based on the coefficient a _n is, the data flow amount control device according to said control station to claim 3, characterized in that to control the transmission amount of packets to the base station. The packet transmission amount control means determines the packet transmission amount from the control station to the base station.

The data inflow amount control device according to claim 4, wherein the data inflow amount control device is calculated by: The buffer retention scheduled time calculating means is a value obtained by averaging packet transmission frequencies freq _n for the plurality of mobile stations n among the plurality of mobile stations n.

And calculate the buffer retention scheduled time Store_time _n for the plurality of mobile stations n.

According to
The packet transmission amount control means determines the packet transmission amount from the control station to the base station.

The data inflow amount control device according to claim 3, wherein the data inflow amount control device according to claim 3 is calculated.   7. The error rate acquisition unit according to claim 1, wherein the error rate in a radio section of packets addressed to the plurality of mobile stations is set to a predetermined set value instead of an actual measurement value. The data inflow control device according to item.   8. The predetermined set value is controlled based on at least one of the number of base stations with which a mobile station communicates simultaneously, the moving speed of the mobile station, the number of paths, and radio quality information. Data inflow control device. A plurality of mobile stations; a control station that relays packets addressed to the plurality of mobile stations; a base station that temporarily stores the packets transmitted from the control station in a buffer and transmits the packets to the plurality of mobile stations; A data inflow control method in a mobile communication system comprising:
Obtaining radio states of the plurality of mobile stations;
Obtaining an error rate in a radio section of packets addressed to the plurality of mobile stations;
Calculating a packet transmission frequency for the plurality of mobile stations;
Calculating the amount of packets waiting to be transmitted to the plurality of mobile stations, which are retained in a buffer in the base station;
The radio state of the plurality of mobile stations, the error rate in the radio section of packets addressed to the plurality of mobile stations, the transmission frequency of packets related to the plurality of mobile stations, and the amount of packets waiting to be transmitted to the plurality of mobile stations And calculating a buffer retention scheduled time for the plurality of mobile stations based on
The wireless state of the plurality of mobile stations, the error rate in the wireless section of the packets addressed to the plurality of mobile stations, the transmission frequency of the packets related to the plurality of mobile stations, and the buffer retention scheduled time related to the plurality of mobile stations And a step of controlling the amount of packets sent from the control station to the base station.

Images