JP2014096658A - Radio resource allocation device, radio resource allocation method, and computer program - Google Patents

Abstract

EPDCCHset is used flexibly for PDSCH.
A required PRB number estimating unit for calculating an estimated number of required PRBs for an EPDCCH multiplexed with PDSCH in a radio resource area within one subframe, and a predetermined plurality of EPDCCHsets in the radio resource area. An EPDCCHset selection unit 13 that selects an EPDCCHset so as to satisfy the calculated estimated number of required PRBs, and a PDSCH that allocates radio resources to the PDSCH from the radio resource areas other than the selected EPDCCHset among the radio resource areas And an allocating unit.
[Selection] Figure 1

Description

  The present invention relates to a radio resource allocation device, a radio resource allocation method, and a computer program.

  The 3GPP (3rd Generation Partnership Project) is working on standardization of a radio interface specification called LTE (Long Term Evolution). Among the LTE, in LTE Rel.11, in addition to the downlink control channel (PDCCH: Physical Downlink Control Channel) used up to the previous "LTE Rel.10", interference avoidance and capacity expansion in the control area are performed. As an objective, an advanced downlink control channel (EPDCCH) was added.

  FIG. 6 is a schematic configuration diagram of a downlink frame of “LTE Rel.11”. FIG. 7 is a configuration example of one subframe in the downlink frame of “LTE Rel.11”. In FIG. 6, the PDCCH is time-multiplexed with a downlink data channel (PDSCH: Physical Downlink Shared Channel). On the other hand, EPDCCH is frequency-multiplexed with PDSCH. Also, as illustrated in FIG. 7, the base station sets in advance a radio resource region (hereinafter referred to as EPDCCHset) to which an EPDCCH can be allocated, and notifies the mobile station of the EPDCCHset. EPDCCHset is composed of one or a plurality of PRBs (Physical Resource Blocks). PRB is one of radio resource units.

  There are two EPDCCH transmission methods: “Localized EPDCCH” using continuous radio resources and “Distributed EPDCCH” using discrete radio resources. For this reason, EPDCCHset also has an EPDCCHset for assigning “Localized EPDCCH” and an EPDCCHset for assigning “Distributed EPDCCH”. However, although the total number of both EPDCCHsets is specified, the breakdown is not specified.

3GPP, RAN1 Chairman ’s Notes, RAN1 # 69.

  However, the conventional radio resource allocation technology has the following problems. Normally, in LTE, to save radio resources, the EPDCCHset notified from the base station to the mobile station is not changed as much as possible, and the radio scheduler of the base station assigns the EPDCCH to the EPDCCHset and performs frequency multiplexing with the PDSCH in the order of 1 ms. ing. Here, if EPDCCHset is dedicated to EPDCCH, PDSCH cannot be allocated even to unused EPDCCHset, which hinders effective use of radio resources. In “LTE Rel.11”, PDSCHs can be assigned to EPDCCHsets to which no EPDCCH is assigned. Therefore, it is not preferable to make EPDCCHset dedicated to EPDCCH from the viewpoint of effective use of radio resources.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a radio resource allocation device, a radio resource allocation method, and a computer program that can flexibly use EPDCCHset for PDSCH.

  In order to solve the above problems, a radio resource allocation device according to the present invention is a radio resource allocation device that performs radio resource allocation, and a required radio resource amount for a control channel multiplexed with a data channel in a specific radio resource region A required radio resource amount estimation unit for calculating an estimated value and a predetermined required radio resource amount estimated value out of a predetermined plurality of control channel assignable radio resource regions in the specific radio resource region are satisfied. A control channel assignable radio resource region selection unit that selects a control channel assignable radio resource region, and the data from a radio resource region other than the selected control channel assignable radio resource region among the specific radio resource regions An assigning unit for assigning radio resources to the channel; And said that there were pictures.

  In the radio resource allocation device according to the present invention, the required radio resource amount estimation unit updates a required radio resource amount estimate based on a radio resource amount already allocated to the control channel in the specific radio resource region, The control channel assignable radio resource region selection unit is based on the required radio resource amount estimated value before update, the required radio resource amount estimated value after update, and a control channel assignable radio resource region that has already been assigned to the control channel. The selected control channel assignable radio resource region is updated, and the allocating unit starts from a radio resource region other than the selected control channel assignable radio resource region after the update among the specific radio resource regions. And assigning radio resources to the data channel.

  In the radio resource allocation device according to the present invention, the required radio resource amount estimation unit calculates a required radio resource amount estimate based on a history of radio resource amounts allocated to the control channel.

  In the radio resource allocating device according to the present invention, the control channel assignable radio resource region selection unit is configured to assign a control channel assignable radio based on a maximum number of mobile stations per radio resource unit in each control channel assignable radio resource region The resource area is selected.

  In the radio resource assignment device according to the present invention, the control channel assignable radio resource region selection unit selects a control channel assignable radio resource region based on the number of assignable mobile stations in each control channel assignable radio resource region. It is characterized by performing.

  In the radio resource assignment device according to the present invention, the control channel is frequency-multiplexed with the data channel.

  The radio resource allocation apparatus according to the present invention is characterized in that downlink radio resources are allocated.

  A radio resource allocation method according to the present invention is a radio resource allocation method for allocating radio resources, and a required radio for calculating a required radio resource amount estimate value for a control channel multiplexed with a data channel in a specific radio resource region. A resource amount estimating step, and a control channel assignable radio resource so as to satisfy the calculated required radio resource amount estimate value from a predetermined plurality of control channel assignable radio resource regions of the specific radio resource region A control channel assignable radio resource region selecting step for selecting a region, and radio resource allocation to the data channel from a radio resource region other than the selected control channel assignable radio resource region in the specific radio resource region An assignment step to be And butterflies.

  A computer program according to the present invention is a computer program for performing radio resource allocation processing for allocating radio resources, and calculates a required radio resource amount estimate value for a control channel multiplexed with a data channel in a specific radio resource region. A required radio resource amount estimation step to be calculated and a control channel so as to satisfy the calculated required radio resource amount estimate value from among a plurality of predetermined control channel assignable radio resource regions of the specific radio resource region A control channel assignable radio resource region selection step for selecting an assignable radio resource region, and a radio for the data channel from a radio resource region other than the selected control channel assignable radio resource region in the specific radio resource region Resource allocation Characterized in that it is a computer program for executing the allocation step, to the computer to perform.

  According to the present invention, it is possible to flexibly use EPDCCHset for PDSCH.

It is a schematic block diagram of the base station apparatus 1 which concerns on one Embodiment of this invention. It is a flowchart of Example 1 of the radio | wireless resource allocation process which concerns on this invention. 10 is a configuration example of a required ECCE number table 100; It is an example of the ranking result of EPDCCHset. It is a flowchart of Example 2 of the radio | wireless resource allocation process which concerns on this invention. FIG. 3 is a schematic configuration diagram of a downlink frame of “LTE Rel.11”. It is a structural example of a certain one subframe in the downlink frame of “LTE Rel.11”.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the present embodiment, “LTE Rel. 11” is assumed. FIG. 1 is a schematic configuration diagram of a base station apparatus 1 according to the present embodiment. In FIG. 1, the base station apparatus 1 includes a radio resource allocation unit 2, a baseband unit 3, an RF unit 4, and an antenna 5. The radio resource allocation unit 2 allocates radio resources in the downlink frame. The baseband unit 3 configures the downlink frame in the baseband according to the radio resource allocation result by the radio resource allocation unit 2. The RF unit 4 wirelessly transmits the downlink frame configured by the baseband unit 3 from the antenna 5.

  The radio resource allocation unit 2 includes an input unit 11, a required PRB number estimation unit 12, an EPDCCHset selection unit 13, a PDSCH allocation unit 14, an EPDCCH allocation unit 15, a storage unit 16, and an output unit 17. Each unit 11 to 15 is connected so that data can be transmitted and received. The input unit 11 inputs data used for radio resource allocation processing. The required PRB number estimation unit 12 calculates an estimated value of the required PRB number (required PRB number estimated value). The required number of PRBs is the number of PRBs necessary for EPDCCH in one subframe.

  The EPDCCHset selection unit 13 selects one or a plurality of EPDCCHsets from a plurality of predetermined EPDCCHsets so as to satisfy the required PRB number estimation value. The PDSCH allocation unit 14 allocates PDSCH to radio resources to which PDSCH can be allocated. In this embodiment, the radio resources to which the PDSCH can be allocated are the radio resources other than the EPDCCHset and the unused EPDCCHset in the radio resource area to which the EPDCCH and the PDSCH can be allocated in one subframe.

  The EPDCCH allocation unit 15 allocates EPDCCH to the EPDCCHset selected by the EPDCCHset selection unit 13 among the EPDCCHsets. The storage unit 16 stores data related to the radio resource allocation process. The output unit 17 outputs information on the radio resource allocation result.

  Hereinafter, an example is given and the radio | wireless resource allocation process which the radio | wireless resource allocation part 2 which concerns on this embodiment performs is demonstrated. In the present embodiment, the following matters are assumed.

  The preset number of EPDCCHsets is the maximum value specified by “LTE Rel.11”. The breakdown of EPDCCHset can be set arbitrarily. The number of PRBs constituting each EPDCCHset may be different. For example, the maximum number of EPDCCHsets for “Distributed EPDCCH” may be set to 1, and the number of PRBs constituting the EPDCCHset may be set to accommodate the number of mobile stations equivalent to the PDCCH. All control information related to PDSCH is transmitted on EPDCCH. For example, it is assumed that a radio resource configuration of “New Carrier Type” defined by “LTE Rel.11” without providing a PDCCH region is used. Each EPDCCHset does not overlap each other.

  FIG. 2 is a flowchart of Embodiment 1 of the radio resource allocation processing according to the present invention. With reference to FIG. 2, the operation of the radio resource allocation unit 2 according to the first embodiment will be described.

  The radio resource allocation unit 2 starts the radio resource allocation process of FIG. 2 at the scheduling timing for a certain subframe (target subframe).

(Step S1)
The required PRB number estimation unit 12 calculates an estimated value of the required PRB number for the target subframe by Expression (1).

However, N _{PRB_required} is an estimated number of required PRBs. AL _ave is an average allocation aggregation level for all mobile stations to which radio resources are allocated. The average assignment aggregation level is an average value of aggregation levels (Aggregation Level) assigned to the target mobile station in the past. The aggregation level is the number of ECCE (Enhanced Control Channel Element) required for allocation of EPDCCH. ECCE is one of radio resource units, and is a collection of a plurality of minimum units of radio resource allocation, and is a minimum allocation unit of EPDCCH. N _averageUE is the average number of assigned mobile stations. The average number of assigned mobile stations is an average value of the number of mobile stations to which radio resources are assigned per scheduling timing. N _ECCE is the number of ECCEs per PRB. In “LTE Rel. 11” according to the present embodiment, N _ECCE is 4.

Required PRB number estimation unit 12 may store the radio resource allocation result in the storage unit 16 for the mobile station, an average assignment aggregation level AL _ave and the average assigned mobile station number N _AverageUE using this historical radio resource allocation result calculate. N _ECCE is preset. Information on mobile stations to which radio resources are allocated is input by the input unit 11.

(Step S2)
The EPDCCHset selection unit 13 selects an EPDCCHset so as to satisfy the required PRB number estimated value calculated in step S1 from a plurality of predetermined EPDCCHsets in the target subframe. For example, in the example of FIG. 7, six EPDCCH sets # 0 to 5 are set in advance, and EPDCCH sets are selected from the six EPDCCH sets # 0 to 5 so as to satisfy the required PRB number estimation value. Hereinafter, an example of the EPDCCHset selection method will be described.

  Information on the predetermined plurality of EPDCCHsets is input by the input unit 11. First, the EPDCCHset selection unit 13 creates the required ECCE number table 100 illustrated in FIG. The required number of ECCEs table 100 describes the required number of ECCEs of each mobile station to which radio resources are allocated for each EPDCCHset. The required number of ECCEs for each EPDCCHset related to a certain mobile station is obtained based on the reception quality information fed back from the mobile station and the EPDCCH assignable area unique to the mobile station. The EPDCCH assignable area unique to a mobile station is an EPDCCHset that can assign an EPDCCH to the mobile station.

Next, the EPDCCHset selection unit 13 calculates the maximum number of accommodated mobile stations per 1 PRB for each EPDCCHset based on the required ECCE table 100. For example, when the number of PRBs constituting one EPDCCHset is 1, in “LTE Rel.11” according to the present embodiment, the number of ECCEs per ECCB N _ECCE is 4, and therefore, one EPDCCHset is composed of 4ECCEs. In the example of FIG. 3, for example, in EPDCCHset # 2, the maximum number of mobile stations among the combinations of mobile stations that can be accommodated by 4ECCE is “mobile stations #A, #G, #B”, “mobile stations” There are three combinations of “#A, #G, #H” or “mobile stations #A, #G, #I”, and the maximum number of mobile stations that can be accommodated is three.

  Next, the EPDCCHset selection unit 13 ranks the EPDCCHsets in descending order of the maximum number of mobile stations accommodated per 1 PRB. As a result, if there are multiple EPDCCHsets with the same maximum number of mobile stations per PRB, rank them in descending order of the number of mobile stations that can be allocated per EPDCCHset with respect to EPDCCHsets with the same maximum number of mobile stations per PRB. To do. In the example of FIG. 3, for example, EPDCCHset # 2 and # 4 both have a maximum number of mobile stations accommodated per PRB of three. Since the number of assignable mobile stations in EPDCCHset # 2 is 6 and the number of assignable mobile stations in EPDCCHset # 4 is 5, EPDCCHset # 2 is set higher than EPDCCHset # 4. As a result, in the example of FIG. 3 (however, the number of PRBs per EPDCCHset is 1), ranking is performed as shown in FIG.

  Next, the EPDCCHset selection unit 13 selects EPDCCHsets in order from the upper EPDCCHset so as to satisfy the required PRB number estimation value according to the rank of the EPDCCHset. For example, when the required PRB number estimated value is 4, EPDCCHset # 1 to # 4 are selected according to the order of FIG. 4A (all EPDCCHsets have 1 PRB number). As another example of EPDCCHset, in FIG. 4B, when the estimated number of required PRBs is 4, EPDCCHset # 1, # 2, # 4 are selected according to the ranking. The EPDCCHset selection unit 13 stores the selected EPDCCHset information (EPDCCHset selection information) in the storage unit 16.

Returning to FIG.
(Step S3)
The PDSCH allocation unit 14 performs temporary allocation of the PDSCH to the mobile station from the radio resource area other than the EPDCCHset selected in step S2 among the radio resource areas to which the PDSCH can be allocated in the target subframe. The PDSCH allocation unit 14 stores the PDSCH temporary allocation result information (PDSCH temporary allocation information) in the storage unit 16.

(Step S4)
Based on the PDSCH temporary allocation information, the EPDCCH allocation unit 15 determines whether the EPDCCH can be allocated to the mobile station to which the PDSCH is temporarily allocated by the EPDCCHset selected in step S2. As a result, if EPDCCH allocation is possible, the process proceeds to step S5. On the other hand, if EPDCCH allocation is impossible, the process returns to step S3, and PDSCH allocation is performed again.

(Step S5)
The EPDCCH allocation unit 15 allocates an EPDCCH to the mobile station to which PDSCH is temporarily allocated based on the EPDCCHset selection information. The EPDCCH allocation unit 15 stores the allocated EPDCCH information (EPDCCH allocation information) in the storage unit 16.

(Step S6)
The PDSCH allocation unit 14 determines the PDSCH for temporary allocation based on the PDSCH temporary allocation information. The PDSCH allocation unit 14 stores the determined PDSCH information (PDSCH determination information) in the storage unit 16.

(Step S7)
The PDSCH allocation unit 14 determines whether there is still a radio resource to which the PDSCH can be allocated in the target subframe. As a result, if there is a radio resource to which the PDSCH can be allocated, the process returns to step S3. On the other hand, if there is no radio resource to which the PDSCH can be allocated, the process proceeds to step S8.

(Step S8)
The output unit 17 outputs PDSCH confirmation information and EPDCCH allocation information stored in the storage unit 16. Thereafter, the process of FIG. 2 is terminated.

  According to the first embodiment, by calculating the required PRB number estimated value and selecting the necessary EPDCCHset based on the required PRB number estimated value, other EPDCCHset radio resources can be used for the PDSCH. . Thereby, EPDCCHset can be flexibly used for PDSCH, and radio resources can be effectively used.

  The second embodiment is a modification of the first embodiment. FIG. 5 is a flowchart of Embodiment 2 of the radio resource allocation processing according to the present invention. In FIG. 5, steps corresponding to those in FIG. Hereinafter, with reference to FIG. 5, the difference between the second embodiment and the first embodiment will be mainly described.

  The radio resource allocation unit 2 starts the radio resource allocation process of FIG. 5 at the scheduling timing for a certain subframe (target subframe). In FIG. 5, steps S1 to S8 are the same as those in the first embodiment shown in FIG. However, in the second embodiment, if there is a radio resource to which the PDSCH can be allocated in step S7, the process proceeds to step S11.

(Step S11)
The required PRB number estimating unit 12 calculates and updates the required PRB number estimated value for the target subframe by Expression (2).

However, N _{PRB_required} is an estimated number of required PRBs. AL _assigned is a total value of aggregation levels of mobile stations (EPDCCH assigned mobile stations) to which EPDCCH has already been _assigned in the target subframe. AL _'ave are targeted at mobile stations except the EPDCCH allocated mobile station from all mobile stations in the radio resource assignment target, an average assignment aggregation level. N ′ _averageUE is the number of mobile stations excluding EPDCCH allocated mobile stations from all mobile stations to which radio resources are allocated.

The required PRB number estimation unit 12 stores the radio resource allocation result in the target subframe in the storage unit 16, and uses the radio resource allocation result, the total value AL _assigned of the aggregation level of the EPDCCH allocated mobile station and the movement Calculate the number of stations N ' _averageUE . Further, the required PRB number estimation unit 12 stores the radio resource allocation result for the mobile station in the storage unit 16, and uses the past radio resource allocation result and the information of the EPDCCH allocated mobile station, to calculate the average allocation aggregation level. _AL'ave is calculated.

(Step S12)
The EPDCCHset selection unit 13 updates the EPDCCHset (required EPDCCHset) selected for EPDCCH allocation. Hereinafter, an example of the EPDCCHset update method will be described. In this example, the EPDCCHset is added to or deleted from the required EPDCCHset using the equations (3) and (4).

However, N _{PRB_required_after} is the required PRB number estimated value N _{PRB_required} after updating in step S11. N _{PRB_required_before} is the required PRB number estimated value N _{PRB_required} before updating in step S11. The threshold is a predetermined value (an integer greater than or equal to 0). For example, “threshold = 0” may be set. The threshold is a parameter for controlling the degree of satisfaction of the required EPDCCHset, and can be set arbitrarily. Different thresholds may be used for Equation (3) and Equation (4).

The EPDCCHset selection unit 13 adds the highest EPDCCHset among the EPDCCHsets that are not currently selected as the required EPDCCHset among the predetermined plurality of EPDCCHsets in the target subframe when Expression (3) is satisfied, to the required EPDCCHset To do. When Equation (3) holds, the updated required PRB number estimated value N _{PRB_required} after updating is greater than the threshold by the required PRB number estimated value N _{PRB_required} before updating. For this reason, the required EPDCCHset is increased so that the EPDCCH can be allocated more reliably.

On the other hand, when Equation (4) is satisfied, the EPDCCHset selection unit 13 selects the lowest EPDCCHset other than the EPDCCHset in which the EPDCCH is already assigned to the mobile station from the currently selected required EPDCCHset. Delete from. When Equation (4) holds, the updated required PRB number estimated value N _{PRB_required} after updating is smaller than the threshold by the required PRB number estimated value N _{PRB_required} before updating. Therefore, the required EPDCCHset is reduced, the reduced EPDCCHset radio resources can be allocated to the PDSCH, and the radio resources that can be allocated to the PDSCH are increased.

  Note that if neither of the expressions (3) and (4) holds, the required EPDCCHset is not updated. Further, even if Expression (3) or Expression (4) holds, if there is no EPDCCHset that can be added or deleted, the required EPDCCHset is not updated.

  The EPDCCHset selection unit 13 recognizes the currently selected EPDCCHset based on the EPDCCHset selection information stored in the storage unit 16. Further, the EPDCCHset selection unit 13 recognizes an EPDCCHset in which the EPDCCH is already allocated to the mobile station based on the EPDCCH allocation information stored in the storage unit 16. Further, the EPDCCHset selection unit 13 stores the information of the EPDCCHset ranking result in step S2 in the storage unit 16, and recognizes the ranking of each EPDCCHset based on the information of the EPDCCHset ranking result.

  Note that steps S11 and S12 may be executed in every flow when there is a radio resource to which the PDSCH can be allocated in step S7, or may be executed at an arbitrary interval.

  According to the first embodiment, it is possible to update the estimated number of required PRBs while reflecting the PDSCH and EPDCCH allocation results in the target subframe, and appropriately change the required EPDCCHset based on the updated results. As a result, the accuracy of using the EPDCCHset radio resource for the PDSCH can be improved.

  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 the above-described embodiment, the ECCE usage index of each mobile station is not considered when ranking EPDCCHset, but the ECCE usage index of each mobile station may be considered.

  Further, in the above-described embodiment, when ranking EPDCCHsets, first, ranking is performed in descending order of the maximum accommodated mobile stations per 1 PRB. As a result, there are a plurality of EPDCCHsets having the same maximum accommodated mobile stations per 1 PRB. In this case, the EPDCCHset having the same maximum number of mobile stations per PRB is further ranked in descending order of the number of mobile stations that can be allocated per EPDCCHset, but the present invention is not limited to this. For example, if the number of assignable mobile stations per 1 EPDCCHset is ranked in descending order first, and there are multiple EPDCCHsets with the same number of assignable mobile stations per 1 EPDCCHset, the number of assignable mobile stations per 1 EPDCCHset is the same. EPDCCHset may be further ranked in descending order of the maximum number of mobile stations per PRB.

  In the above-described embodiment, the required PRB number estimated value in which the PRB is a radio resource unit is used as the required radio resource amount estimated value. However, the radio resource unit can be arbitrarily set.

  Further, in the above-described embodiment, “LTE Rel.11” is assumed, and PDSCH is used as a data channel, EPDCCH is used as a control channel, and EPDCCHset is used as a radio resource area that can be assigned to a control channel. It is not limited to. For example, the allocation target radio resource may be an uplink (link in the direction from the mobile station to the base station) radio resource, or a downlink (link in the direction from the base station to the mobile station) radio It may be a resource. Further, the radio resource to be allocated may be any resource region or combination of resource regions such as a time region, a frequency region, or a code region. The multiplexing method of the data channel and the control channel may be any multiplexing method or a combination of multiplexing methods such as time multiplexing, frequency multiplexing or code multiplexing.

Further, a program for realizing each step shown in FIG. 2 or FIG. 5 is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read and executed by a computer system, so that wireless communication is performed. Resource allocation processing 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 ... Base station apparatus, 2 ... Radio resource allocation part (radio resource allocation apparatus), 11 ... Input part, 12 ... Required PRB number estimation part (required radio resource amount estimation part), 13 ... EPDCCHset selection part (control channel allocation possible) (Radio resource region selection unit), 14 ... PDSCH allocation unit (allocation unit), 15 ... EPDCCH allocation unit, 16 ... storage unit, 17 ... output unit

Claims (9)

In a radio resource allocation device that allocates radio resources,
A required radio resource amount estimation unit for calculating a required radio resource amount estimate for a control channel multiplexed with a data channel in a specific radio resource region;
A control channel for selecting a control channel assignable radio resource area so as to satisfy the calculated required radio resource amount estimate value from a predetermined plurality of control channel assignable radio resource areas in the specific radio resource area An allocatable radio resource area selection unit;
An allocating unit that allocates radio resources to the data channel from radio resource areas other than the selected control channel allocable radio resource area in the specific radio resource area;
A radio resource allocation device comprising: The required radio resource amount estimation unit updates the required radio resource amount estimate based on the radio resource amount already assigned to the control channel in the specific radio resource region,
The control channel assignable radio resource region selection unit is based on the required radio resource amount estimated value before update, the required radio resource amount estimated value after update, and a control channel assignable radio resource region that has already been assigned to the control channel. Update the selected control channel assignable radio resource region,
The allocating unit allocates radio resources to the data channel from radio resource areas other than the selected control channel allocable radio resource area after the update among the specific radio resource areas.
The radio resource allocating device according to claim 1.   The radio resource allocation apparatus according to claim 1 or 2, wherein the required radio resource amount estimation unit calculates a required radio resource amount estimate based on a history of radio resource amounts allocated to the control channel. .   The control channel assignable radio resource region selection unit performs selection of a control channel assignable radio resource region based on the maximum number of mobile stations accommodated per radio resource unit in each control channel assignable radio resource region. The radio resource allocation device according to any one of claims 1 to 3.   The control channel assignable radio resource region selection unit selects a control channel assignable radio resource region based on the number of mobile stations that can be assigned to each control channel assignable radio resource region. 4. The radio resource allocation device according to any one of 3 above.   The radio resource allocation device according to claim 1, wherein the control channel is frequency-multiplexed with the data channel.   The radio resource allocating device according to any one of claims 1 to 6, wherein downlink radio resources are allocated. A radio resource allocation method for allocating radio resources,
A required radio resource amount estimation step for calculating a required radio resource amount estimate for a control channel multiplexed with a data channel in a specific radio resource region;
A control channel for selecting a control channel assignable radio resource area so as to satisfy the calculated required radio resource amount estimate value from a predetermined plurality of control channel assignable radio resource areas in the specific radio resource area An assignable radio resource region selection step;
An allocation step of allocating radio resources to the data channel from radio resource areas other than the selected control channel allocatable radio resource area among the specific radio resource areas;
A radio resource allocating method comprising: A computer program for performing radio resource allocation processing for allocating radio resources,
A required radio resource amount estimation step for calculating a required radio resource amount estimate for a control channel multiplexed with a data channel in a specific radio resource region;
A control channel for selecting a control channel assignable radio resource area so as to satisfy the calculated required radio resource amount estimate value from a predetermined plurality of control channel assignable radio resource areas in the specific radio resource area An assignable radio resource region selection step;
An allocation step of allocating radio resources to the data channel from radio resource areas other than the selected control channel allocatable radio resource area among the specific radio resource areas;
A computer program for causing a computer to execute.

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