JP2013183228A - Radio scheduler processing device, radio scheduling method, and computer program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve utilization of a radio resource of an interfering station non-transmission timing by including a first terminal for which radio wave interference from the interfering station is intended to be avoided and a second terminal other than the first terminal in a base station utilizing a technology of time division multiplex interference control.SOLUTION: The present invention includes: performing a scheduler for macro station transmission timing that performs a radio resource allocation to only a second terminal as an object with respect to the macro station transmission timing (S3); and selecting whether to allocate the radio resource to both first terminal and second terminal or only the first terminal as the object according to a difference of a throughput between the first terminal and the second terminal with respect to the interfering station non-transmission timing so as to perform the scheduler for macro station non-transmission timing which allocates the radio resource (S4).

Description

  The present invention relates to a wireless scheduler processing device, a wireless scheduling method, and a computer program.

  In recent years, with the rapid spread of mobile terminals such as smartphones and tablet terminals, there has been a situation in which wireless facilities possessed by telecommunications carriers are tightened due to a rapid increase in mobile traffic. As one of countermeasures, a heterogeneous network (hereinafter referred to as “HetNet”) has been studied (see, for example, Non-Patent Document 1). In HetNet, pico base stations and femto base stations that are smaller and have a lower transmission output than macro base stations are placed in an overlay manner in hot spots where traffic is concentrated in the service area (coverage area) of the macro base station.

  Conventionally, "LTE (Long Term Evolution)" is known as one of the standards studied by 3GPP (Third Generation Partnership Project) (see Non-Patent Documents 2 and 3, for example). Cell range expansion (CRE) technology and time division multiplexing interference control technology are being studied.

CRE technology is one of the load balancing methods in LTE. Here, the CRE technology will be described. The terminal selects a base station to be connected at startup. The terminal measures the received power of the reference signal transmitted by the neighboring base station, and connects to the base station having the maximum measured value. This is expressed by equation (1).
s (j) = arg max (B (i) P (i, j)) (1)
Here, s (j) is the connection base station ID of terminal j. P (i, j) is the received power of the reference signal of the base station i at the terminal j. B (i) is the “CRE bias value” of base station i.

  In HetNet, when promoting traffic offload from a macro base station to a pico base station, as a CRE technique, the CRE bias value of the macro base station is set to 1, and the CRE bias value of the pico base station is set to a value larger than 1. Set. This makes it easier for the terminal to connect to the pico base station than to the macro base station.

  Time division multiplexing interference control technology is a technology that avoids radio wave interference from interfering stations for downlink (direction from base station to terminal) communication in HetNet by instantaneously stopping the interfering station. It is. FIG. 6 is an explanatory diagram of the time division multiplexing interference control technique. In FIG. 6, the pico base station 200 is arranged in the coverage area 110 of the macro base station 100 that is an interfering station. The coverage area (pico cell) of the pico base station 200 is expanded from the area 210 to the area 220 by CRE technology.

  FIG. 6 (1) shows the status of the timing at which the macro base station 100 transmits radio waves (macro station transmission timing). At the macro station transmission timing, the pico base station 200 does not transmit a packet to a specific terminal 310 among the terminals 300 and 310 connected thereto. This specific terminal 310 is a terminal that is assumed to cause inconvenience in downlink communication due to radio wave interference caused by radio waves transmitted by the macro base station 100. For example, the specific terminal 310 is located at the end of the extended coverage area 220 of the pico base station 200, and the interference wave from the macro base station 100 is received much stronger than the desired wave from the pico base station 200. Is mentioned.

  FIG. 6 (2) shows the situation of the timing at which the macro base station 100 does not transmit radio waves (macro station stop timing). At the macro station stop timing, the pico base station 200 transmits a packet to the terminals 300 and 310 connected to itself. Therefore, the pico base station 200 also transmits a packet to the specific terminal 310 at the macro station stop timing.

D. Lopez-Perez, et al., “Enhanced Intercell Interference Conference Coordination Challenges in Heterogeneous Networks,” IEEE Wireless Commun., Vol.18, no.3, pp.22-30, Jun. 2011. http://www.3gpp.org/ S. Sesia, et al., LTE, The UMTS Long Term Evolution, Wiley, Apr. 2009. 3GPP, TR 36.814 Ver. 9.0.0, “Further Advancements for E-UTRA Physical Layer Aspects,” Mar. 2010.

  However, a radio scheduling method in a base station (for example, the pico base station 200 in FIG. 6) that uses the above-described time division multiplexing interference control technique is a problem.

  At the macro station (interfering station) transmission timing, radio scheduling is performed except for terminals that want to avoid radio wave interference from the macro station. For this reason, from the viewpoint of fairness of communication opportunities, it is conceivable that, at the macro station stop timing, radio scheduling is performed with priority given to a terminal that is desired to avoid radio wave interference from the macro station. However, if there are not enough terminals that want to avoid radio interference from the macro station, the radio resources at the macro station stop timing can be fully utilized only by the terminals that want to avoid radio interference from the macro station. Is not limited. Therefore, it is desirable to use a radio scheduling method capable of utilizing radio resources including a terminal that wants to avoid radio wave interference from the macro station and other terminals at the macro station stop timing.

  The present invention has been made in view of such circumstances, and in a base station using time division multiplexing interference control technology, a terminal that wants to avoid radio wave interference from an interfering station, and other terminals And a radio scheduler processing apparatus, a radio scheduling method, and a computer program capable of utilizing radio resources at an interference station stop timing.

  In order to solve the above problem, a radio scheduler processing apparatus according to the present invention includes a first terminal that is a target for avoiding radio wave interference from an interfering station for downlink communication by a time division multiplexing interference control technique. A radio scheduler processing apparatus that assigns radio resources to a second terminal other than the first terminal, and assigns radio resources to only the second terminal with respect to the interfering station transmission timing. For both the first terminal and the second terminal according to the difference in throughput between the first terminal and the second terminal with respect to the interfering station stop timing, A second scheduler for allocating radio resources by selecting whether to allocate radio resources or to allocate radio resources only for the first terminal; Characterized in that was.

  The radio scheduler processing apparatus according to the present invention includes a first terminal that is a target for avoiding radio wave interference from an interfering station for downlink communication by a time division multiplexing interference control technique, and a second terminal other than the first terminal. A radio scheduler processing apparatus for allocating radio resources for a given terminal, a first scheduler for allocating radio resources for only a second terminal with respect to the interfering station transmission timing, The radio resource is allocated to both the first terminal and the second terminal at a predetermined frequency with respect to the interference station stop timing, or the radio resource is targeted only to the first terminal. And a second scheduler that selects whether to allocate radio resources and allocates radio resources.

  In the radio scheduler processing apparatus according to the present invention, the second scheduler includes a second terminal when there is a remainder of radio resources as a result of radio resource allocation only for the first terminal. And assigning radio resources.

  The radio scheduler processing apparatus according to the present invention includes a throughput storage unit that stores throughput for each terminal, and the first scheduler and the second scheduler allocate radio resources using the throughput of the terminal in the throughput storage unit. And the throughput in the throughput storage unit is updated with the throughput of the terminal based on the radio resource allocation result.

  In the wireless scheduler processing apparatus according to the present invention, the first scheduler and the second scheduler use a proportional fairness scheduler.

  The radio scheduling method according to the present invention includes a first terminal that is a target for avoiding radio wave interference from an interfering station for downlink communication by a time division multiplexing interference control technique, and a second terminal other than the first terminal. A radio scheduling method for allocating radio resources for a terminal, the step of allocating radio resources for only a second terminal with respect to the interfering station transmission timing, and the interfering station stop timing On the other hand, according to the throughput difference between the first terminal and the second terminal, radio resources are allocated to both the first terminal and the second terminal, or the first terminal And a step of selecting whether to allocate radio resources only for the target and allocating radio resources.

  The radio scheduling method according to the present invention includes a first terminal that is a target for avoiding radio wave interference from an interfering station for downlink communication by a time division multiplexing interference control technique, and a second terminal other than the first terminal. A radio scheduling method for allocating radio resources for a terminal, the step of allocating radio resources for only a second terminal with respect to the interfering station transmission timing, and the interfering station stop timing On the other hand, whether to allocate radio resources to both the first terminal and the second terminal at a predetermined frequency, or to allocate radio resources only to the first terminal Selecting and allocating radio resources.

  The computer program according to the present invention includes a first terminal that is a target for avoiding radio wave interference from an interfering station for downlink communication by a time division multiplexing interference control technique, and a second terminal other than the first terminal. A computer program for performing a radio scheduler process for allocating radio resources for the target, and assigning radio resources only for the second terminal with respect to the interfering station transmission timing; Whether to allocate radio resources for both the first terminal and the second terminal according to the throughput difference between the first terminal and the second terminal with respect to the interfering station stop timing, Or selecting whether to allocate radio resources only for the first terminal and allocating radio resources to the computer. Characterized in that it is a because of a computer program.

  The computer program according to the present invention includes a first terminal that is a target for avoiding radio wave interference from an interfering station for downlink communication by a time division multiplexing interference control technique, and a second terminal other than the first terminal. A computer program for performing a radio scheduler process for allocating radio resources for the target, and assigning radio resources only for the second terminal with respect to the interfering station transmission timing; Radio resources are allocated to both the first terminal and the second terminal at a predetermined frequency with respect to the interfering station stop timing, or only the first terminal is targeted. A computer program for causing a computer to select whether to perform resource allocation and to perform radio resource allocation And wherein the door.

  According to the present invention, in a base station that uses time division multiplexing interference control technology, including the terminal that wants to avoid radio wave interference from the interfering station and other terminals, The effect that radio resources can be utilized is obtained.

It is a block diagram which shows the structural example of the base station apparatus which concerns on one Embodiment of this invention. It is a flowchart of the radio | wireless scheduler process which concerns on one Embodiment of this invention. 3 is a flowchart showing a procedure of processing of a scheduler for macro station transmission timing according to step S3 of FIG. 3 is a flowchart showing a processing procedure of a macro station stop timing scheduler according to step S4 of FIG. 2; It is a graph for demonstrating the effect which concerns on one Embodiment of this invention. It is explanatory drawing of a time division multiplexing type interference control technique.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram illustrating a configuration example of a base station apparatus according to an embodiment of the present invention. FIG. 1 shows a configuration related to a downlink radio packet scheduling function of a base station apparatus.

  The base station apparatus shown in FIG. 1 avoids radio wave interference from an interfering station for downlink communication in HetNet by using time division multiplexing interference control technology. The base station apparatus shown in FIG. 1 is, for example, a pico base station 200 arranged in the coverage area 110 of the macro base station 100 in HetNet as shown in FIG. 6, and the coverage area is expanded by CRE technology. In addition, radio interference from the macro base station 100 for downlink communication is avoided by time division multiplexing interference control technology. In this embodiment, it is assumed that the base station apparatus shown in FIG. 1 is arranged in the coverage area of a macro base station (hereinafter referred to as a macro station) that is an interfering station.

  In FIG. 1, a radio packet scheduler unit 1 performs radio packet scheduling using CSI (Channel State Information), macro station transmission / stop patterns, and terminal information. The fairness throughput storage unit 2 stores the fairness throughput for each terminal. The fairness throughput storage unit 2 is accessed from the wireless packet scheduler unit 1.

  The downlink traffic channel radio resource allocation unit 4 allocates radio resources to the radio packet generated by the downlink traffic channel radio packet generation unit 3 according to the scheduling result of the radio packet scheduler unit 1.

  The wireless packet scheduler unit 1 receives CSI, macro station transmission / stop pattern, and terminal information. CSI is specified by LTE. CSI is information representing a downlink state that is periodically fed back from a terminal to a base station. In LTE, CSI is composed of CQI (Channel Quality Indicator), RI (Rank Indicator), and PMI (Precoding Matrix Indicator). CQI is information obtained by quantizing SINR (Signal to Interference plus Noise Ratio).

  There are two types of CQI: wideband CQI and subband CQI. Wideband CQI represents the average SINR of all system bandwidths. The subband CQI represents SINR for each frequency resource block called a subband. RI represents applicability of MIMO (Multiple-Input Multiple-Output) transmission. PMI represents an index of transmission weight suitable for MIMO transmission.

  The CSI is fed back from the terminal to the base station. Whether or not the CSI is calculated by the terminal using the reference signal transmitted by the base station at the macro station transmission timing (the base station at the macro station stop timing). Whether the terminal is calculated using the reference signal transmitted by the station). As a result, for each terminal, CSI at the macro station transmission timing and CSI at the macro station stop timing can be distinguished.

  The macro station transmission / stop pattern is information for specifying the macro station transmission timing and the macro station stop timing. The terminal information is information on terminals connected to the base station apparatus, and does not perform downlink communication at the macro station transmission timing and performs downlink communication at the macro station stop timing for each terminal. It indicates whether it is a terminal (hereinafter referred to as A terminal) or a terminal other than A terminal (hereinafter referred to as B terminal).

  The radio packet scheduler unit 1 performs radio packet scheduling only for the B terminal at the macro station transmission timing according to the terminal information, and performs radio packet scheduling for the terminals including the A terminal at the macro station stop timing. .

  The operation of the radio packet scheduler unit 1 shown in FIG. 1 will be described with reference to FIG. FIG. 2 is a flowchart of the wireless scheduler process according to the present embodiment. The radio packet scheduler unit 1 performs the radio scheduler process of FIG. 2 for each downlink subframe.

(Step S1) The radio packet scheduler unit 1 selects a terminal to be scheduled in a subframe to be scheduled. Specifically, among all terminals connected to the own base station apparatus, only the terminal that is the destination of data in the transmission buffer of the own base station apparatus is set as the scheduling target.

(Step S2) Based on the macro station transmission / stop pattern, the radio packet scheduler unit 1 determines whether or not the subframe to be scheduled is the macro station transmission timing (whether it is the macro station stop timing). To do. When the subframe to be scheduled is the macro station transmission timing, the process proceeds to step S3, and when the subframe to be scheduled is the macro station stop timing, the process proceeds to step S4.

(Step S3) The radio packet scheduler unit 1 executes a macro station transmission timing scheduler. Thereafter, the process of FIG. 2 is terminated.

(Step S4) The radio packet scheduler unit 1 executes a macro station stop timing scheduler. Thereafter, the process of FIG. 2 is terminated.

  FIG. 3 is a flowchart showing a procedure of processing of the macro station transmission timing scheduler according to step S3 of FIG. In step S11 of FIG. 3, the radio packet scheduler unit 1 executes a proportional fairness scheduler (PFS) for only the B terminal among the scheduling target terminals.

  Here, PFS will be described. PFS is known as a typical algorithm of a wireless scheduler (see, for example, Non-Patent Document 3). PFS aims to maximize average user throughput while maintaining fairness in throughput among users.

In PFS, users to which radio resources are allocated are selected in descending order of an index value called “PF metric”. The PF metric is calculated by equation (2).
M (i, j, n) = R (i, j, n) ÷ T (i, j, n−1) (2)
However, M (i, j, n) is the PF metric of the j-th user connected to the i-th base station in the n-th subframe. R (i, j, n) is an instantaneous data rate when radio resources are allocated to the j-th user connected to the i-th base station in the n-th subframe. T (i, j, n−1) is an index value called “fairness throughput”, and is an average throughput up to the “n−1” th subframe for the j th user connected to the i th base station. .

  The instantaneous data rate is calculated based on CSI fed back from the user. In this case, when executing the macro station transmission timing scheduler, the instantaneous data rate is calculated using the CSI at the macro station transmission timing. On the other hand, when executing a macro station stop timing scheduler, which will be described later, the instantaneous data rate is calculated using CSI at the macro station stop timing. For the instantaneous data rate, the measured value at the macro station transmission timing may be used when the macro station transmission timing scheduler is executed, and the measured value at the macro station stop timing may be used when the macro station stop timing scheduler is executed. .

The fairness throughput is calculated by Expression (3) and Expression (4).
When radio resources are allocated in the n-th subframe to the j-th user connected to the i-th base station,
T (i, j, n) = (1−a (i)) T (i, j, n−1) + a (i) R (i, j, n) (3)
When radio resources cannot be allocated in the nth subframe for the jth user connected to the ith base station,
T (i, j, n) = (1−a (i)) T (i, j, n−1)
Where a (i) is a forgetting factor of fairness throughput. The fairness throughput T (i, j, n) is updated after the radio scheduling for the nth subframe is completed.
The above is an explanation of PFS.

  In step S11 of FIG. 3, the radio packet scheduler unit 1 executes PFS only for the B terminal among the scheduling target terminals, and determines the B terminal to which the radio resource is allocated and the radio resource to be allocated in the subframe to be scheduled. To do. After that, the radio packet scheduler unit 1 updates the fairness throughput of each terminal for all terminals (all A terminals and all B terminals) connected to the base station apparatus. The wireless packet scheduler unit 1 stores the updated fairness throughput of each terminal in the fairness throughput storage unit 2. Thereafter, the process of FIG. 3 is terminated. The fairness throughput storage unit 2 only needs to store the latest fairness throughput of each terminal.

  Next, a macro station stop timing scheduler will be described with reference to FIG. FIG. 4 is a flowchart showing a processing procedure of the macro station stop timing scheduler according to step S4 of FIG.

(Step S21) The radio packet scheduler unit 1 sets the latest fairness throughput of each terminal in the fairness throughput storage unit 2 for all terminals (all A terminals and all B terminals) connected to the base station apparatus. The average value of fairness throughput of all A terminals (referred to as A average value) and the average value of fairness throughput of all B terminals (referred to as B average value) are calculated.

(Step S22) The radio packet scheduler unit 1 calculates a difference obtained by subtracting the A average value from the B average value (referred to as an average value difference).

(Step S23) The radio packet scheduler unit 1 compares the average value difference with a predetermined threshold value. As a result, if the average value difference is equal to or smaller than the threshold value, the process proceeds to step S24, and if the average value difference exceeds the threshold value, the process proceeds to step S25.

(Step S24) The radio packet scheduler unit 1 executes PFS for all terminals to be scheduled (all A terminals and all B terminals). As a result, the radio packet scheduler unit 1 determines terminals to which radio resources are allocated and radio resources to be allocated in the subframe to be scheduled. After that, the radio packet scheduler unit 1 updates the fairness throughput of each terminal for all terminals (all A terminals and all B terminals) connected to the base station apparatus. The wireless packet scheduler unit 1 stores the updated fairness throughput of each terminal in the fairness throughput storage unit 2. Thereafter, the process of FIG. 4 is terminated.

(Step S25) The radio packet scheduler unit 1 executes PFS only for the A terminal among the scheduling target terminals. Thereby, the radio packet scheduler unit 1 determines the A terminal to which the radio resource is allocated and the radio resource to be allocated in the scheduling target subframe. After that, the radio packet scheduler unit 1 updates the fairness throughput of each terminal for all terminals (all A terminals and all B terminals) connected to the base station apparatus. The wireless packet scheduler unit 1 stores the updated fairness throughput of each terminal in the fairness throughput storage unit 2.

(Step S26) The radio packet scheduler unit 1 determines whether there is a remainder of radio resources that are not allocated in the subframe to be scheduled. As a result, if there is a surplus of radio resources, the process proceeds to step S27. On the other hand, when there is no surplus of radio resources, the radio packet scheduler 1 targets the fairness throughput of each terminal for all terminals (all A terminals and all B terminals) connected to its own base station apparatus. Update. Then, the wireless packet scheduler unit 1 stores the updated fairness throughput of each terminal in the fairness throughput storage unit 2. Thereafter, the process of FIG. 4 is terminated.

(Step S27) The radio packet scheduler unit 1 executes PFS for only the B terminal among the scheduling target terminals. Thereby, the radio packet scheduler unit 1 determines the B terminal to which the radio resource is allocated and the radio resource to be allocated in the subframe to be scheduled. After that, the radio packet scheduler unit 1 updates the fairness throughput of each terminal for all terminals (all A terminals and all B terminals) connected to the base station apparatus. The wireless packet scheduler unit 1 stores the updated fairness throughput of each terminal in the fairness throughput storage unit 2. Thereafter, the process of FIG. 4 is terminated.

  According to the present embodiment, radio resource allocation is performed only for the B terminal with respect to the macro station transmission timing. On the other hand, for macro station stop timing, radio resources are allocated to both A terminal and B terminal according to the difference in throughput between A terminal and B terminal, or only A terminal is Select whether to allocate radio resources as a target, and allocate radio resources. As a result, in the base station using the time division multiplexing interference control technology, including the A terminal that wants to avoid radio wave interference from the macro station and the other B terminals, the radio resource of the macro station stop timing Can be used.

  Furthermore, according to the present embodiment, when there is a remaining radio resource as a result of radio resource allocation targeting only the A terminal, radio resource allocation is performed only for the B terminal. Thereby, the utilization efficiency of the radio | wireless resource of a macro station stop timing can be improved. Steps S26 and S27 may be provided if necessary, and may not be provided.

  In addition, according to the present embodiment, the fairness throughput storage unit 2 is provided, and the fairness throughput is shared by the macro station transmission timing and the macro station stop timing. Accordingly, it is possible to execute the PFS in each case by reflecting the radio resource allocation results of both the macro station transmission timing and the macro station stop timing in the fairness throughput. As a result, it is possible to contribute to maintaining fairness of user throughput.

  FIG. 5 is a graph for explaining the effect according to the present embodiment. The graph of FIG. 5 shows the result of the simulation. The simulation conditions include “Table A.2.1.1-2 Case 1”, “Table A.2.1.1.2-3 Model 1” and “Table A.2.1.1.2-5 Configuration # 4b” of Non-Patent Document 4. Was used. However, the carrier frequency is 800 MHz. In the configuration of a macro station (interfering station) of 7 cells and 21 sectors, two hot spots are arranged so as to be uniformly distributed per sector area. Ten terminals were placed in a hot spot with a radius of 40m, and one pico base station was placed in the center of the hot spot. Furthermore, 10 terminals are arranged in the sector area so as to be uniformly distributed. As the user traffic model, an infinite length IP packet is assumed, and a full buffer traffic model that always simulates a state in which the transmission buffer of the base station is not available is used. The CRE bias value was 8 dB. The macro station stop timing ratio was 25%.

  In FIG. 5, waveforms 20A and 20B are obtained by first executing PFS only for the A terminal, and if there is a remainder in the radio resources after completing the radio resource allocation of the A terminal, further targeting only the B terminal. This is the result when PFS is executed. Waveforms 30A and 30B are results when PFS is executed for both the A terminal and the B terminal. Waveforms 20A and 30A show the average user throughput for terminal A. Waveforms 20B and 30B show the average user throughput for the B terminal.

  As shown in FIG. 5, in the waveforms 20A and 20B, the average user throughputs of the A terminal and the B terminal are balanced.

  On the other hand, in the waveforms 30 </ b> A and 30 </ b> B, the average user throughput of the B terminal is considerably larger than that of the A terminal. This is because the PFS is executed for both the A terminal and the B terminal, and as a result, more radio resources are allocated to the B terminal having a high SINR, resulting in a significant decrease in the throughput of the A terminal.

  Therefore, according to the present embodiment, if the average value of the fairness throughput of terminal B is too higher than the average value of the fairness throughput of terminal A as a result of the threshold determination in step S23 of FIG. By preferentially allocating radio resources, it is possible to balance the throughputs of the A terminal and the B terminal.

  Thus, according to the present embodiment, it is possible to flexibly design the throughput in the mobile communication system. For example, the throughput can be designed so as to maximize the throughput of the entire mobile communication system after ensuring the minimum throughput necessary for voice communication in a balanced manner for all terminals. .

As mentioned above, although embodiment of this invention was explained in full detail with reference to drawings, the specific structure is not restricted to this embodiment, The design change etc. of the range which does not deviate from the summary of this invention are included.
For example, in steps S21, S22, and S23 of FIG. 4, not the average value of fairness throughput, but the median value (50% -ile value) or 5% -ile of the cumulative distribution function (CDF) of fairness throughput. A value may be used. Alternatively, a difference value between the 95% -ile value and the 5% -ile value may be used.

  Moreover, you may change as shown below the terminal made into the object of PFS in step S25, S27 of FIG. First, in step S25, only the A terminal whose fairness throughput is equal to or less than a predetermined threshold is set as a PFS target. In step S27, the A terminal and the B terminal to which radio resources are not allocated in step S25 are set as PFS targets. As a result, radio resources can be allocated with priority given to a terminal having a particularly low throughput among the A terminals.

  Further, instead of steps S21, S22, and S23 in FIG. 4, it may be selected whether step S24 is executed or steps S25 to S27 are executed at a predetermined frequency. The frequency can be changed by setting. Thereby, according to the frequency, switching S <b> 24 and steps S <b> 25 to S <b> 27 are executed to obtain an effect that the throughput can be designed flexibly. Furthermore, the amount of calculation required for steps S21, S22, and S23 can be reduced.

Also, a program for realizing each step shown in FIG. 2, FIG. 3, or FIG. 4 is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read into a computer system and executed. Thus, the wireless scheduler process may be performed. Here, the “computer system” may include an OS and hardware such as peripheral devices.
“Computer-readable recording medium” refers to a flexible disk, a magneto-optical disk, a ROM, a writable nonvolatile memory such as a flash memory, a portable medium such as a DVD (Digital Versatile Disk), and a built-in computer system. A storage device such as a hard disk.

Further, the “computer-readable recording medium” means a volatile memory (for example, DRAM (Dynamic DRAM) in a computer system that becomes a server or a client when a program is transmitted through a network such as the Internet or a communication line such as a telephone line. Random Access Memory)), etc., which hold programs for a certain period of time.
The program may be transmitted from a computer system storing the program in a storage device or the like to another computer system via a transmission medium or by a transmission wave in the transmission medium. Here, the “transmission medium” for transmitting the program refers to a medium having a function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line.
The program may be for realizing a part of the functions described above. Furthermore, what can implement | achieve the function mentioned above in combination with the program already recorded on the computer system, and what is called a difference file (difference program) may be sufficient.

DESCRIPTION OF SYMBOLS 1 ... Wireless packet scheduler part (wireless scheduler processing apparatus, 1st scheduler, 2nd scheduler), 2 ... Fairness throughput storage part (wireless scheduler processing apparatus, throughput storage part), 100 ... Macro base station, 200 ... Pico base Station

Claims (9)

Radio resource allocation for a first terminal that is a target for avoiding radio wave interference from an interfering station for downlink communication by a time division multiplexing interference control technique and a second terminal other than the first terminal A wireless scheduler processing device for performing
A first scheduler that assigns radio resources only to the second terminal for the interfering station transmission timing;
Whether to allocate radio resources for both the first terminal and the second terminal according to the throughput difference between the first terminal and the second terminal with respect to the interfering station stop timing, Or a second scheduler that selects whether to allocate radio resources only for the first terminal, and allocates radio resources;
A wireless scheduler processing device comprising: Radio resource allocation for a first terminal that is a target for avoiding radio wave interference from an interfering station for downlink communication by a time division multiplexing interference control technique and a second terminal other than the first terminal A wireless scheduler processing device for performing
A first scheduler that assigns radio resources only to the second terminal for the interfering station transmission timing;
Radio resources are allocated to both the first terminal and the second terminal at a predetermined frequency with respect to the interfering station stop timing, or only the first terminal is targeted. A second scheduler for selecting whether to allocate resources and for allocating radio resources;
A wireless scheduler processing device comprising:   The second scheduler assigns radio resources to those including the second terminal when there is a remainder of radio resources as a result of radio resource allocation only for the first terminal. The wireless scheduler processing device according to claim 1 or 2, characterized in that: Provided with a throughput storage unit for storing throughput for each terminal,
The first scheduler and the second scheduler perform radio resource allocation using the throughput of the terminal in the throughput storage unit, and the terminal in the throughput storage unit according to the throughput of the terminal based on the radio resource allocation result Update throughput,
The wireless scheduler processing device according to claim 1, wherein the wireless scheduler processing device is a wireless scheduler processing device.   5. The wireless scheduler processing device according to claim 1, wherein a proportional fairness scheduler is used as the first scheduler and the second scheduler. 6. Radio resource allocation for a first terminal that is a target for avoiding radio wave interference from an interfering station for downlink communication by a time division multiplexing interference control technique and a second terminal other than the first terminal A wireless scheduling method for performing
Assigning radio resources only to the second terminal for the interfering station transmission timing;
Whether to allocate radio resources for both the first terminal and the second terminal according to the throughput difference between the first terminal and the second terminal with respect to the interfering station stop timing, Or selecting whether to allocate radio resources only for the first terminal, and allocating radio resources;
A wireless scheduling method comprising: Radio resource allocation for a first terminal that is a target for avoiding radio wave interference from an interfering station for downlink communication by a time division multiplexing interference control technique and a second terminal other than the first terminal A wireless scheduling method for performing
Assigning radio resources only to the second terminal for the interfering station transmission timing;
Radio resources are allocated to both the first terminal and the second terminal at a predetermined frequency with respect to the interfering station stop timing, or only the first terminal is targeted. Selecting whether to allocate resources, assigning radio resources,
A wireless scheduling method comprising: Radio resource allocation for a first terminal that is a target for avoiding radio wave interference from an interfering station for downlink communication by a time division multiplexing interference control technique and a second terminal other than the first terminal A computer program for performing wireless scheduler processing,
Assigning radio resources only to the second terminal for the interfering station transmission timing;
Whether to allocate radio resources for both the first terminal and the second terminal according to the throughput difference between the first terminal and the second terminal with respect to the interfering station stop timing, Or selecting whether to allocate radio resources only for the first terminal, and allocating radio resources;
A computer program for causing a computer to execute. Radio resource allocation for a first terminal that is a target for avoiding radio wave interference from an interfering station for downlink communication by a time division multiplexing interference control technique and a second terminal other than the first terminal A computer program for performing wireless scheduler processing,
Assigning radio resources only to the second terminal for the interfering station transmission timing;
Radio resources are allocated to both the first terminal and the second terminal at a predetermined frequency with respect to the interfering station stop timing, or only the first terminal is targeted. Selecting whether to allocate resources, assigning radio resources,
A computer program for causing a computer to execute.

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