JP2008301253A - Frame allocation method, wireless communication system, wireless base station, and frame allocation program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To allocate a frame of a packet so as to minimize an increase of a delay time even when exceeding a capacity of a wireless frame. <P>SOLUTION: The frame allocation method allocates an up data channel used by respective wireless terminals for an up sub-frame at a wireless base station of a wireless communication system which the wireless base station and a plurality of wireless terminals communicate interactively by a multiple access system and complex communication system. The wireless terminal transmits a delay amount from an input of a transmission packet until transmission by the up sub-frame as delay information at an up control channel. The wireless base station includes a prior packet selection means for setting priority in a descending order of delay amounts based on the delay information of the plurality of wireless terminals when the wireless base station receives the up control channel, extracts the delay information of the wireless terminal, and allocates the up sub-frame used by the wireless terminal so as to reduce the delay amount based on the delay information to allocate the up sub-frame used by the respective wireless terminals based on the priority. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention is a multiple access scheme such as a TDMA (Time Division Multiple Access) scheme, an FDMA (Frequency Division Multiple Access) scheme, a CDMA (Code Division Multiple Access) scheme, or the like between a radio base station and a plurality of radio terminals. In a radio communication system that performs bidirectional communication using a (time division duplex) scheme or an FDD (frequency duplex) scheme, frame allocation for allocating an uplink data channel used for transmission from each radio terminal to a radio base station in an uplink subframe The present invention relates to a method, a frame allocation program, a radio base station and a radio communication system that perform the frame allocation.

  FIG. 7 shows a configuration example of a multiple access wireless communication system. In the figure, a wireless base station 71 and a plurality of wireless terminals 72-1 to 72-n are connected via a wireless line. The information devices 73-1 to 73-n connected to the respective wireless terminals are configured to perform data transmission with a network outside the figure via each wireless terminal and the wireless base station. For example, in the TDMA-TDD system, the wireless terminal 72 receives a data packet transmitted from the information device 73, converts it into a wireless packet signal, and transmits it from the wireless base station 71 using the upstream data channel assigned to the upstream subframe. . The radio base station 71 adjusts the uplink data channel assigned to each so that radio packet signals transmitted from the radio terminals 72 do not interfere with each other.

  FIG. 8 shows a configuration example of a TDMA-TDD frame. In the figure, one radio frame period is divided into a downlink subframe 81 and an uplink subframe 82. Normally, an uplink subframe 82 used for radio terminal transmission is arranged next to the downlink subframe 81 used for radio base station transmission on the time axis. A downlink control channel 811 is arranged at the head of the downlink subframe 81, and information regarding the configuration of this radio frame is broadcast. The broadcast information includes arrangement information of the downlink data channel 812 and the uplink data channel 821 in the radio frame, and the radio terminal uses the downlink data channel 812 addressed to itself and transmission for transmission based on this information. The allocation of the uplink data channel 821 is recognized.

  Further, each radio terminal notifies the radio base station of information related to each radio terminal using the uplink control channel 822 transmitted together with the uplink data channel 821. Delay information, which is one piece of this information, is a time interval from when a data packet is input from an information device to a wireless terminal until it is transmitted in a wireless frame. This is because the radio terminal transmits delay information to the radio base station in the case of voice communication or the like that requires real-time performance because the transmission delay affects quality, and the radio base station transmits the radio information based on the delay information. The uplink data channel of the terminal is allocated and adjusted so as to suppress the transmission delay in the radio section.

  Here, the delay adjustment function (Non-Patent Document 1) will be described with reference to FIG. 9 taking VoIP packet transmission as an example. In the standard G.711, which is generally used as a speech encoding method, the encoding rate is 64 kbps and the VoIP frame period is mainly 20 msec. If the radio frame period corresponding to this is 5 msec, the radio terminal transmits VoIP packets at a rate of once every four radio frames. The numbers in () in FIG. 9 indicate the order of VoIP packets, and the numbers in [] indicate the order of radio frames.

  First, it is assumed that the wireless terminal receives the VoIP packet v0 (1) at the timing of the wireless frame [1] and transmits it to the wireless base station at the timing of the wireless frame [3], for example. At this time, the radio terminal notifies the radio base station of the time T0 (1) required to transmit the VoIP packet v0 (1) as delay information using the uplink control channel. When receiving the delay information T0 (1), the radio base station performs scheduling so as to minimize the delay information T0 (1), and determines a frame to be allocated next. FIG. 9 shows an example in which the next VoIP packet v0 (2) is received at the timing of the radio frame [5] and the radio frame [5] is selected as the shortest frame. In this way, an optimum frame with the delay amount suppressed to one frame or less is calculated except for transmission processing delay and propagation delay. That is, when the radio base station has a fixed period like a VoIP packet, the delay adjustment function as described above for adjusting the delay amount of the transmission frame works in advance.

  The above description uses the TDMA-TDD communication system as an example. The downlink subframe 81 and the uplink subframe 82 used for bidirectional communication (duplex), and the downlink data channel 812 allocated to each wireless terminal for multiple access. And the uplink data channel 821 are all multiplexed on the time axis. For example, in other multiple access schemes and duplex communications (duplex) schemes multiplexed on the frequency axis The delay adjustment function is the same.

  FIG. 10 shows a configuration of a conventional frame allocation processing circuit mounted on a radio base station of a radio communication system. In the figure, the delay adjustment function is realized by an uplink control channel receiving unit 11, a delay amount extracting unit 12, and an optimum frame calculating unit 13. That is, the uplink control channel receiving unit 11 receives the uplink control channel from the uplink subframe, the delay amount extracting unit 12 extracts the delay information from the uplink control channel, and the optimum frame calculating unit 13 assigns next based on the delay information. Determine the shortest frame to power. The frame allocation unit 14 performs a process of adjusting by a round robin method using the channel allocation table 15 when a plurality of VoIP packets are allocated to the radio frame determined by the optimal frame calculation unit 13. An example of the channel allocation table 15 for six VoIP packets v0 to v5 is shown in FIG.

  For example, as shown in FIG. 12, VoIP packets v0 to v5 are inputted to each wireless terminal at an arbitrary timing, and the optimum frame calculation unit 13 tries to assign the shortest wireless frame [1] to each VoIP packet. In this case, it is assumed that the wireless frame [1] has a capacity of only 5 VoIP packets. The channel allocation table 15 has a configuration in which the priority of frame allocation is circulated by the round robin method for the VoIP packets v0 to v5. For example, it is assumed that the pointer for allocation to the radio frame [1] is v1.

In this situation, the VoIP packets v1 to v5 are preferentially assigned to the radio frame [1], and the VoIP packet v0 overflowing in the radio frame [1] is assigned to the next radio frame [2]. In the wireless frame [5] after the next 4 frames, the pointer is shifted by 5 to become v0, so that the VoIP packets v0 to v4 are preferentially assigned, and the VoIP packet v5 is assigned to the next wireless frame [6]. It is done. Further, in the wireless frame [9] after the next four frames, the VoIP packets v5 to v3 are preferentially assigned, and the VoIP packet v4 is assigned to the next wireless frame [10]. In this way, the transmission right of each VoIP packet is assigned fairly.
IEEE Std.802.16e-2005, 6.3.5.2.1 UGS

  In the conventional frame allocation, when the shortest radio frame is allocated based on the delay information of each packet notified by the uplink control channel, each packet is allocated fairly by the round robin method. Therefore, as shown in FIG. In some cases, the VoIP packet v0 having the largest delay among the VoIP packets v0 to v5 is assigned to the next frame. At this time, the delay amount T0 of the VoIP packet v0 may be about two frames. As described above, in the conventional frame allocation, VoIP packets allocated to the next frame are generated periodically at a certain frequency (in the case of FIG. 11, once in 6 times), and the delay amount is 2 frames. There was a problem that a situation occurred and this became a delay jitter, which deteriorated transmission quality.

  The present invention provides a frame allocation method, a radio communication system, a radio base station, and a frame allocation program capable of performing frame allocation of packets so that an increase in delay time is minimized even when the capacity of the radio frame is exceeded The purpose is to do.

  1st invention is a radio base station of the radio | wireless communications system which performs bidirectional | two-way communication by a multiple access system and a duplex system between a radio base station and several radio | wireless terminals. In a frame allocation method for allocating an uplink data channel used by each wireless terminal to an uplink subframe to be used, the wireless terminal uses the uplink control channel as a delay information from a transmission packet to transmission in the uplink subframe. The radio base station receives the uplink control channel, extracts the delay information of the radio terminal, and assigns an uplink subframe used by the radio terminal so that the delay amount is reduced based on the delay information, Priority packet selecting means for assigning priorities in descending order of delay based on delay information of a plurality of wireless terminals, and each wireless device based on the priorities End performs allocation of uplink sub-frames used.

  Here, the radio base station adjusts the delay amount of each radio terminal based on the history of the delay amount of the radio terminal, and the priority packet selection means assigns a priority from the radio terminal having the adjusted delay amount, An uplink subframe used by each wireless terminal may be assigned based on the priority order.

  A second aspect of the invention is a configuration in which bidirectional communication is performed between a wireless base station and a plurality of wireless terminals by a multiple access method and a duplex method. The wireless base station transmits data from a plurality of wireless terminals to the wireless base station. In a wireless communication system in which an uplink data channel used by each wireless terminal is assigned to an uplink subframe to be used, the wireless terminal uses an uplink control channel as a delay information from a transmission packet to transmission in the uplink subframe. In this configuration, the radio base station receives the uplink control channel, extracts the delay information of the radio terminal, and allocates the uplink subframe used by the radio terminal based on the delay information so that the delay amount is reduced Sometimes, priority packet selection means for assigning priorities in descending order of delay based on delay information of a plurality of wireless terminals is provided. Wireless terminal uses a configuration for allocating the uplink subframe.

  Here, the radio base station adjusts the delay amount of each radio terminal based on the history of the delay amount of the radio terminal, and the priority packet selection means assigns a priority from the radio terminal having the adjusted delay amount, A configuration may be employed in which uplink subframes used by each wireless terminal are assigned based on the priority order.

  A third invention is a radio communication system that performs bidirectional communication between a radio base station and a plurality of radio terminals using a multiple access scheme and a duplex scheme, and an uplink subframe used for transmission from the plurality of radio terminals to the radio base station In the radio base station to which the uplink data channel used by each radio terminal is assigned, the uplink control channel that transmits the delay amount from when the radio terminal inputs the transmission packet until it is transmitted in the uplink subframe as delay information is received. Control channel receiving means, delay amount extracting means for extracting delay information of the wireless terminal from the uplink control channel, and optimum frame calculating means for calculating an uplink subframe used by the wireless terminal so that the delay amount is reduced based on the delay information And the uplink data channel used by each wireless terminal is allocated to the uplink subframe calculated by the optimum frame calculation means. The delay information of a plurality of radio terminals is input from the frame allocation unit and the delay amount extraction unit, priorities are set in descending order of the delay amount, and the frame allocation unit determines the uplink subframes used by each radio terminal based on the priorities. Priority packet selection means for controlling to perform allocation.

  Here, the wireless base station includes delay amount processing means for inputting delay information of a plurality of wireless terminals from the delay amount extracting means and adjusting the delay amount of each wireless terminal based on the history of delay amounts of the wireless terminals. The priority packet selection means may be configured to assign priorities from wireless terminals having a large adjusted delay amount, and to allocate uplink subframes used by the wireless terminals based on the priorities.

  A fourth invention is a radio base station of a radio communication system that performs bidirectional communication between a radio base station and a plurality of radio terminals by a multiple access method and a duplex method, and for transmission from a plurality of radio terminals to the radio base station. In the frame allocation program for allocating an uplink data channel used by each wireless terminal to an uplink subframe to be used, an uplink control channel that transmits, as delay information, a delay amount from when the wireless terminal inputs a transmission packet to transmission in the uplink subframe Is received by the uplink control channel receiving means, the second step of extracting the delay information of the wireless terminal from the uplink control channel by the delay amount extracting means, and the delay amount is reduced based on the delay information The third step of calculating the uplink subframe used by the wireless terminal by the optimum frame calculating means, and the third step calculated by the third step A fourth step of assigning the uplink data channel used by each wireless terminal to the subframe by the frame allocating means, and inputting delay information of a plurality of wireless terminals from the delay amount extracting means to the priority packet selecting means, so that the delay amount is large. And a fifth step of controlling the frame allocation means to allocate the uplink subframes used by each wireless terminal based on the priority.

  Here, the frame allocation program has a sixth step of adjusting the delay amount of each wireless terminal based on the history of the delay amount of the wireless terminal, and the fifth step is adjusted in the sixth step. Priorities may be assigned from radio terminals having a large delay amount, and the frame allocation unit may be controlled to allocate uplink subframes used by each radio terminal based on the priorities.

  Since the present invention preferentially allocates a frame with a large delay amount, a transmission packet with a small delay amount can be allocated to the next frame when the capacity of the radio frame is exceeded. Thereby, the increase in delay time can be suppressed to the minimum in the entire wireless communication system.

  Further, the present invention performs a delay amount prediction process based on a delay amount history such as a moving average delay amount and a predicted delay amount based on a delay amount change Δ, and preferentially frames packets with a large predicted delay amount. Since allocation is performed, highly accurate frame allocation can be performed.

(First embodiment)
FIG. 1 shows a first embodiment of the present invention. Here, the configuration of the frame allocation processing circuit mounted on the radio base station of the radio communication system of the present invention is shown. The configuration of this frame allocation processing circuit corresponds to the processing procedure of the frame allocation method of the present invention and the algorithm of the frame allocation program.

  In the figure, the basic functions of the uplink control channel reception unit 11, the delay amount extraction unit 12, the optimum frame calculation unit 13, and the frame allocation unit 14 are the same as those in the conventional configuration. That is, the uplink control channel receiving unit 11 receives the uplink control channel from the uplink subframe, the delay amount extracting unit 12 extracts the delay information from the uplink control channel, and the optimum frame calculating unit 13 assigns next based on the delay information. Determine the shortest radio frame to be used. The frame allocation unit 14 performs a process of allocating the packet of each radio terminal to the radio frame determined by the optimum frame calculation unit 13.

The feature of this embodiment is that the delay amount of the packet of each wireless terminal extracted by the delay amount extraction unit 12 is input, and priority is given to the packet of the wireless terminal having a large delay amount to control the processing of the frame allocation unit 14. The priority packet selection unit 16 is provided. For example, as shown in FIG. 2 (1), the channel allocation table 15 of the frame allocation unit 14 associates the VoIP packets v0 to v5 with the respective delay amounts T0 to T5, and is extracted by the delay amount extraction unit 12. Each delay amount T0 to T5 is
T0>T4>T3>T1>T5> T2
It shall be in the relationship.

  The priority packet selection unit 16 inputs the delay amounts T0 to T5 of each VoIP packet from the delay amount extraction unit 12, and rearranges the VoIP packets in the channel allocation table 15 in descending order of delay amount as shown in FIG. 2 (2). . The frame allocation unit 14 refers to the rearranged channel allocation table 15 and preferentially assigns five VoIP packets v0, v1, v3, v4, v5 having a large delay amount to the frame determined by the optimum frame calculation unit 13. assign.

  FIG. 3 shows an operation example of the first embodiment. Here, as in the example described with reference to FIG. 12, VoIP packets v0 to v5 are input to each wireless terminal at an arbitrary timing, and the optimum frame calculation unit 13 uses the shortest wireless frame [1] for each VoIP packet. Assume that the wireless frame [1] has a capacity of only 5 VoIP packets. The frame allocation unit 14 allocates five VoIP packets v0, v1, v3, v4, v5 having a large delay amount to the radio frame [1] according to the channel allocation table 15 shown in FIG. 2 (2). The VoIP packet v2 having the minimum delay amount that could not be assigned to the radio frame [1] is assigned to the next radio frame [2].

  In the wireless frame [5] after the next four frames, the delay amount of the VoIP packet v2 assigned to the wireless frame [2] is maximized, so that the VoIP packet v2 is ranked at the top of the channel assignment table 15. At this time, if the relationship between the delay amounts of other VoIP packets is unchanged, five VoIP packets v0, v1, v2, v3, v4 having large delay amounts are assigned to the radio frame [5], and the radio frame [5 The VoIP packet v5 with the minimum delay overflowed in [5] is assigned to the next radio frame [6]. In this way, the right to transmit is preferentially assigned to the VoIP packet with a large delay amount in each VoIP packet, and the VoIP packet with the minimum delay is always assigned to the next radio frame, thereby reducing the capacity of the radio frame. Frame allocation can be performed so that an increase in the delay time is minimized as a whole when the time exceeds the limit.

  Here, when the inputs of the VoIP packets v0 to v5 are evenly distributed, the delay time of the VoIP packet assigned to the radio frame next to the shortest radio frame is N (1). 1 + 1 / N) frame. That is, with respect to the delay time suppressed within one frame by the delay adjustment function, in the frame allocation method of the present invention, the amount of delay of the VoIP packet overflowing from the optimum frame is increased by 1 / N frame on average. If this delay increase amount does not affect the VoIP quality, it is superior to the conventional round robin method in which a delay of two frames may occur periodically.

  In general, information equipment such as VoIP terminals and wireless terminals have separate reference clocks, and VoIP packets and wireless frames are not synchronized. The radio frame of each radio terminal is synchronized with the radio base station, and based on this, each VoIP packet advances or lags apart. Therefore, even if the temporal context of each VoIP packet stops in a short period, the order of the VoIP packets changes over a long period. For this reason, in the frame allocation method of this embodiment, the VoIP packet with the minimum delay amount is not always the same packet.

(Second Embodiment)
FIG. 4 shows a second embodiment of the present invention. Here, the configuration of the frame allocation processing circuit mounted on the radio base station of the radio communication system of the present invention is shown. The configuration of this frame allocation processing circuit corresponds to the processing procedure of the frame allocation method of the present invention and the algorithm of the frame allocation program.

In the figure, the basic functions of the uplink control channel reception unit 11, the delay amount extraction unit 12, the optimum frame calculation unit 13, and the frame allocation unit 14 are the same as those in the first embodiment. The feature of this embodiment is that the delay amount of each wireless terminal packet extracted by the delay amount extraction unit 12 is accumulated over m frames (m is a finite integer of 2 or more), and the moving average value of the delay amount is calculated. And a priority packet selection unit 18 for controlling the processing of the frame allocation unit 14 by assigning priorities to packets of a wireless terminal having a large moving average delay amount. For example, in the channel allocation table 15, as shown in FIG. 5 (1), the VoIP packets v 0 to v 5 are associated with the respective moving average delay amounts Te 0 to Te 5, and each moving average calculated by the delay amount processing unit 17 is used. The delay amount Te0 to Te5 is
Te0>Te4>Te3>Te1>Te5> Te2
It shall be in the relationship.

  The priority packet selection unit 18 inputs the moving average delay amounts Te0 to Te5 of each VoIP packet from the delay amount processing unit 17, and, as shown in FIG. 5 (2), the VoIP of the channel allocation table 15 in descending order of the moving average delay amount. Rearrange packets. The frame allocation unit 14 refers to the rearranged channel allocation table 15 and allocates five VoIP packets v0, v1, v3, v4, and v5 having a large delay amount to the frame determined by the optimum frame calculation unit 13.

  FIG. 6 shows an operation example of the second embodiment. Here, as in the example described with reference to FIG. 12, VoIP packets v0 to v5 are input to each wireless terminal at an arbitrary timing, and the optimum frame calculation unit 13 uses the shortest wireless frame [1] for each VoIP packet. Assume that the wireless frame [1] has a capacity of only 5 VoIP packets. The frame allocation unit 14 allocates five VoIP packets v0, v1, v3, v4, v5 having a large moving average delay amount to the radio frame [1] according to the channel allocation table 15 shown in FIG. 5 (2). The VoIP packet v2 having the minimum moving average delay amount that could not be assigned to the radio frame [1] is assigned to the next radio frame [2].

  In the wireless frame [5] after the next four frames, the delay amount of the VoIP packet v2 assigned to the wireless frame [2] increases, but if the relationship of the moving average delay amount of each VoIP packet remains unchanged, the wireless frame [5] Five VoIP packets v0, v1, v3, v4, v5 with a large moving average delay amount are assigned to frame [5], and the VoIP packet v2 with the minimum moving average delay amount overflowing in radio frame [5] is Assigned to radio frame [6]. In this way, a transmission right is preferentially assigned to a VoIP packet having a large moving average delay amount in each VoIP packet, and a VoIP packet having the smallest moving average delay amount is always assigned to the next radio frame. When the radio frame capacity is exceeded, frame allocation can be performed so that the increase in delay time is minimized as a whole.

Further, the delay amount processing unit 17 sets the delay amount at the previous frame allocation as T0, the change amount of the delay amount per radio frame as Δ, and the radio frame number from the previous frame allocation to the current frame allocation as s. When
Te0 = T0 + Δ · s
And the priority packet selection unit 18 associates the VoIP packets v0 to v5 with the respective predicted delay amounts Te0 to Te5 in the channel allocation table 15. Good. Here, the change amount Δ of the delay amount per radio frame is assigned to the radio frame [k] after the radio frame [i] in the VoIP packet v0, and the respective delay amounts are represented by T0 (i), T0 (k ), The average value calculated by (T0 (k) -T0 (i)) / (ki).

  In addition, when performing a prediction process based on a history of delay amounts, such as a predicted delay amount based on a moving average delay amount or a delay amount change amount Δ, the delay amount of a packet assigned to the radio frame next to the shortest radio frame is It becomes temporarily larger and the impact becomes larger. Therefore, when a packet is assigned to the radio frame next to the shortest radio frame, the delay time for one cycle of the radio frame may be subtracted from the delay amount.

The figure which shows the 1st Embodiment of this invention. The figure which shows the example of the channel allocation table in 1st Embodiment. The time chart which shows the operation example of 1st Embodiment. The figure which shows the 2nd Embodiment of this invention. The figure which shows the example of the channel allocation table in 2nd Embodiment. The time chart which shows the operation example of 2nd Embodiment. The figure which shows the structural example of the radio | wireless communications system of a multiple access system. The figure which shows the structural example of a TDMA-TDD frame. The time chart which shows the operation example of a delay adjustment function. The figure which shows the structural example of the conventional frame allocation processing circuit. The figure which shows the example of the conventional channel allocation table. The time chart which shows the operation example of the conventional frame allocation processing circuit.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Uplink control channel receiving part 12 Delay amount extraction part 13 Optimal frame calculation part 14 Frame allocation part 15 Channel allocation table 16, 18 Priority packet selection part 17 Delay amount processing part

Claims (8)

A radio base station of a radio communication system that performs bidirectional communication between a radio base station and a plurality of radio terminals using a multiple access method and a duplex method. Each uplink subframe used for transmission from a plurality of radio terminals to the radio base station In a frame allocation method for allocating an uplink data channel used by a wireless terminal,
The wireless terminal transmits a delay amount from input of a transmission packet to transmission in the uplink subframe as delay information on an uplink control channel,
The radio base station receives the uplink control channel, extracts delay information of the radio terminal, and allocates an uplink subframe used by the radio terminal so that a delay amount is reduced based on the delay information. Priority packet selection means for assigning priorities in descending order of delay based on delay information of the plurality of wireless terminals, and assigning uplink subframes used by each wireless terminal based on the priorities Frame allocation method. The frame allocation method according to claim 1,
The wireless base station adjusts the delay amount of each wireless terminal based on the history of the delay amount of the wireless terminal, and the priority packet selection unit assigns a priority from the wireless terminal having a large adjusted delay amount, A frame allocation method comprising: allocating an uplink subframe used by each wireless terminal based on the priority order. A configuration in which bidirectional communication is performed between a wireless base station and a plurality of wireless terminals by a multiple access method and a duplex method, and each wireless base station transmits each uplink subframe used for transmission from a plurality of wireless terminals to the wireless base station. In a wireless communication system that allocates an uplink data channel used by a wireless terminal,
The wireless terminal is configured to transmit a delay amount from input of a transmission packet to transmission in the uplink subframe as delay information through an uplink control channel,
The radio base station receives the uplink control channel, extracts delay information of the radio terminal, and allocates an uplink subframe used by the radio terminal so that a delay amount is reduced based on the delay information. It is configured to include priority packet selection means for assigning priorities in descending order of delay amounts based on delay information of the plurality of wireless terminals, and to allocate uplink subframes used by each wireless terminal based on the priorities. A wireless communication system. The wireless communication system according to claim 3,
The wireless base station adjusts the delay amount of each wireless terminal based on the history of the delay amount of the wireless terminal, and the priority packet selection unit assigns a priority from the wireless terminal having a large adjusted delay amount, A wireless communication system, characterized in that an uplink subframe used by each wireless terminal is assigned based on the priority order. In a wireless communication system that performs bidirectional communication between a wireless base station and a plurality of wireless terminals using a multiple access method and a duplex method, each wireless terminal uses an uplink subframe used for transmission from the plurality of wireless terminals to the wireless base station. In the radio base station that allocates the uplink data channel,
An uplink control channel receiving means for receiving an uplink control channel transmitted as delay information from the time when the wireless terminal inputs a transmission packet until it is transmitted in the uplink subframe;
Delay amount extracting means for extracting delay information of the wireless terminal from the uplink control channel;
Optimal frame calculation means for calculating an uplink subframe used by the wireless terminal so as to reduce a delay amount based on the delay information;
Frame allocating means for allocating an uplink data channel used by each wireless terminal to the uplink subframe calculated by the optimum frame calculating means;
The delay information of the plurality of wireless terminals is input from the delay amount extraction means, priorities are assigned in descending order of delay amounts, and the frame assignment means assigns uplink subframes used by the wireless terminals based on the priorities. A radio base station comprising: priority packet selection means for performing control. The radio base station according to claim 5,
A delay amount processing unit that inputs delay information of the plurality of wireless terminals from the delay amount extraction unit and adjusts a delay amount of each wireless terminal based on a history of the delay amount of the wireless terminal;
The priority packet selection unit is configured to assign a priority order from the adjusted wireless terminal having a large delay amount, and to allocate an uplink subframe used by each wireless terminal based on the priority order. base station. A radio base station of a radio communication system that performs bidirectional communication between a radio base station and a plurality of radio terminals using a multiple access method and a duplex method. Each uplink subframe used for transmission from a plurality of radio terminals to the radio base station In a frame allocation program for allocating an uplink data channel used by a wireless terminal,
A first step of receiving, by uplink control channel receiving means, an uplink control channel that has been transmitted as delay information from the wireless terminal that has input a transmission packet until it is transmitted in the uplink subframe;
A second step of extracting delay information of the wireless terminal from the uplink control channel by a delay amount extracting unit;
A third step of calculating an uplink subframe used by the wireless terminal by an optimal frame calculation means so that a delay amount is reduced based on the delay information;
A fourth step of allocating an uplink data channel used by each wireless terminal to the uplink subframe calculated in the third step by a frame allocation unit;
The delay information of the plurality of wireless terminals is input from the delay amount extraction means to the priority packet selection means, priorities are set in descending order of the delay amounts, and the frame allocation means is used by each wireless terminal based on the priorities. And a fifth step of controlling to perform subframe allocation. In the frame allocation program according to claim 7,
A sixth step of adjusting the delay amount of each wireless terminal based on a history of the delay amount of the wireless terminal;
In the fifth step, priorities are assigned from the radio terminals having a large delay amount adjusted in the sixth step, and the frame allocation means allocates the uplink subframes used by the radio terminals based on the priorities. A frame allocation program characterized by being controlled to perform.

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